The present application claims priority from korean patent application No. 10-2022-0156668 filed in the korean intellectual property office on the date of 2022, 11 and 21, korean patent application No. 10-2022-0156741 filed on the date of 2022, 11 and 27, 10-2023-0039586 filed on the date of 2023, the entire disclosures of which are incorporated herein by reference for all purposes.
Detailed Description
The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein, but may be altered as will be apparent after an understanding of the disclosure of the application, except for operations that must occur in a certain order. As another example, the order of operations and/or the order within operations may be performed in parallel, except for at least a portion of the order of operations and/or at least a portion of the order within operations that must occur in a certain order (e.g., a particular order). In addition, descriptions of features known after understanding the present disclosure may be omitted for the sake of clarity and conciseness.
The features described herein may be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent upon an understanding of the present disclosure. The term "may" is used herein with respect to an example or embodiment, for example with respect to what the example or embodiment may include or implement, meaning that there is at least one example or embodiment that includes or implements this feature, and all examples and embodiments are not limited thereto. The term "example" or "embodiment" as used herein has the same meaning, e.g., the phrase "in one example" has the same meaning as "in one embodiment" and "in one or more examples" has the same meaning as "in one or more embodiments".
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The articles "a," "an," and "the" are intended to also include the plural forms unless the context clearly indicates otherwise. As a non-limiting example, the terms "comprises," "comprising," and "having" specify the presence of stated features, amounts, operations, components, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, amounts, operations, components, elements, and/or groups thereof. In addition, although an embodiment may set forth the presence of such terms "comprising," "including," and "having" specify the presence of stated features, amounts, operations, components, elements, and/or combinations thereof, other embodiments may exist in which one or more of the stated features, amounts, operations, components, elements, and/or combinations thereof are not present.
Throughout the specification, when a component, element, or layer is referred to as being "on," "connected to," "coupled to," or "joined to" another component, element, or layer, it can be directly on (e.g., in contact with), connected to, coupled to, or joined to the other component, element, or layer, or one or more other components, elements, or layers intervening therebetween may be reasonably present. When a component, element, or layer is referred to as being "directly on," "directly connected to," "directly coupled to," or "directly joined to" another component, element, or layer, there are no other components, elements, or layers intervening therebetween. Likewise, expressions such as "between …" and "immediately between …" and "adjacent to …" and "immediately adjacent to …" can also be interpreted as described previously.
Although terms such as "first," "second," and "third," or A, B, (a), (b), etc., may be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections are not limited by these terms. Each of these terms is not intended to limit, for example, the nature, order, or sequence of the corresponding member, component, region, layer, or section, but is merely intended to distinguish the corresponding member, component, region, layer, or section from other members, components, regions, layers, or sections. Thus, a first member, first component, first region, first layer, or first portion mentioned in examples described herein may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.
As used herein, the term "and/or" includes any one of the listed items associated and any combination of any two or more of the listed items associated. The phrase "at least one of A, B and C," etc. is intended to have a separate meaning, and these phrases "at least one of A, B and C," etc. also include examples in which one or more of A, B and C may be present (e.g., any combination of one or more of A, B and C), unless the respective description and embodiment requires such a list (e.g., "at least one of A, B and C") to be interpreted as having a combined meaning.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Terms such as those defined in commonly used dictionaries will be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
One or more examples may provide an imaging lens system utilizing an optical path folding member.
In one or more examples, the first lens may represent the lens closest to the object (or subject). In addition, the number of lenses may represent the order of arrangement of lenses from the object side to the imaging surface in the optical axis direction. For example, the second lens may represent a lens of a second arrangement from the object side, and the third lens may represent a lens of a third arrangement from the object side. In one or more examples, the radius of curvature, thickness, distance TTL from the object side surface to the imaging surface of the first lens, height IMG HT of the imaging surface, and focal length of the lens are expressed in millimeters (mm).
Each of the thickness of the lenses, the distance between the lenses, TTL, and the incident angle may be a size calculated based on the optical axis of the imaging lens system. Further, in describing the shape of the lens, a convex surface of the lens may represent that the paraxial region of the corresponding surface is convex, and a concave surface of the lens may represent that the paraxial region of the corresponding surface is concave. Thus, although the surface of the lens is described as being convex, the edge portion of the lens may also be concave. Also, although the surface of the lens is described as being concave, the edge portion of the lens may also be convex.
The imaging lens system described herein may be installed in a portable electronic device. In an example, by way of example only, the imaging lens system may be installed in a smart phone (or portable terminal), a laptop computer, an augmented reality device, a Virtual Reality (VR) device, a portable gaming machine, or the like. However, the range of use and the use examples of the imaging lens system described herein may not be limited to the above-described electronic apparatus. For example, imaging lens systems may be applied to electronic devices that may require high resolution imaging while providing a narrow installation space.
The exemplary imaging lens systems described herein may reduce the external dimensions of the imaging lens system while ensuring a long back focal length BFL (or distance from the image side to the imaging side of the final lens). In an example, the exemplary imaging lens systems described herein may reduce the outer dimensions of the imaging lens system while ensuring the BFL required to achieve a tele imaging lens system through the use of reflective members. In another example, the imaging lens system described herein may provide an imaging surface having a substantial size to achieve high resolution. In yet another example, the imaging lens system described herein may have an integrated form that is installed in a portable terminal while ensuring a long focal length or long BFL.
In one or more examples, the light path folding member may refer to any member that may allow light to be reflected. For example, by way of example only, the light path folding member may collectively refer to all reflectors, prisms, and the like. Thus, in one or more examples, the reflector, prism, and optical path folding member may all refer to the same assembly or interchangeable assemblies.
An exemplary imaging lens system according to the first aspect may include: a lens group including a plurality of lenses; and an optical path folding member disposed between the lens group and the imaging surface. In the imaging lens system according to the first aspect, the lens group may include three or more lenses arranged in order from the object side to the imaging surface. In an example, the lens group may include a first lens, a second lens, and a third lens arranged in order from the object side to the imaging surface. In another example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens arranged in order from the object side to the imaging surface. In the imaging lens system according to the first aspect, the optical path folding member may include a plurality of members. For example, the optical path folding member may include two prisms. In another example, the light path folding member may include three prisms. The imaging lens system according to the first aspect may satisfy a unique conditional expression. In an example, the imaging lens system may satisfy the following conditional expression: 0.7< BFL/TTL <1.20. For reference, in the conditional expression, TTL is a distance from an object side surface of a foremost lens (or first lens) in the lens group to an imaging surface, and BFL is a distance from an image side surface of a rearmost lens in the lens group to the imaging surface.
In the imaging lens system according to the first aspect, the optical path folding member may include a plurality of reflecting surfaces, if necessary.
The imaging lens system according to the second aspect may include: a lens group including a plurality of lenses; and an optical path folding member disposed between the lens group and the imaging surface. In the imaging lens system according to the second aspect, the lens group may include three or more lenses arranged in order from the object side to the imaging surface. In an example, the lens group may include a first lens, a second lens, and a third lens arranged in order from the object side to the imaging surface. In another example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens arranged in order from the object side to the imaging surface. In the imaging lens system according to the second aspect, the optical path folding member may include a plurality of members. In an example, the optical path folding member may include two prisms. In another example, the light path folding member may include three prisms. The imaging lens system according to the second aspect may satisfy a unique conditional expression. For example, the imaging lens system may satisfy the following conditional expression: 1.05< TTL/f. For reference, in the conditional expression, f is a focal length of the imaging lens system.
The imaging lens system according to the third aspect may include: a lens group including a plurality of lenses; and an optical path folding member disposed between the lens group and the imaging surface. In the imaging lens system according to the third aspect, the lens group may include three or more lenses arranged in order from the object side to the imaging surface. In an example, the lens group may include a first lens, a second lens, and a third lens arranged in order from the object side to the imaging surface. In another example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens arranged in order from the object side to the imaging surface. In the imaging lens system according to the third aspect, the optical path folding member may include a plurality of members. In an example, the optical path folding member may include two prisms. In another example, the light path folding member may include three prisms. In the imaging lens system according to the third aspect, the optical path folding member may include a member that adjusts an amount of incident light or an amount of outgoing light. In an example, the light shielding plate may be disposed on at least one of the incident surface and the exit surface of the first prism. The light shielding plate may have various shapes to adjust the amount of incident light or outgoing light. In examples, the aperture of the light shield may have a circular, oval, or polygonal shape or a combination thereof.
The imaging lens system according to the fourth aspect may satisfy one or more of the following conditional expressions. However, not only the imaging lens system according to the fourth aspect may satisfy the following conditional expression. In an example, the imaging lens system according to the first to third aspects described above may also satisfy one or more of the following conditional expressions:
0.70<BFL/TTL
10mm<f
1.05<TTL/f
1.60≤Nmax≤1.70
0.70<BFL/f<1.20。
in the conditional expression, BFL is a distance from an image side surface to an imaging surface of a final lens in the lens group, and Nmax is a maximum refractive index of lenses included in the lens group.
For some of the above conditional expressions, the imaging lens system may satisfy the following more limited forms:
0.70<BFL/TTL<0.90
15.0mm<f<23.0mm
1.16<TTL/f<1.36。
The imaging lens system according to the fifth aspect may satisfy one or more of the following conditional expressions. However, not only the imaging lens system according to the fifth aspect may satisfy the following conditional expression. In an example, the imaging lens system according to the first to fourth aspects described above may also satisfy one or more of the following conditional expressions:
0.10<IMG HT/BFL<0.13
0.60<fF/BFL<1.30
-1.0<fR/BFL<-0.40
0.06<|(fF+fR)/BFL|<0.40
0.30<LFS1/BFL<0.50
0.42<(LFS1+LRS2)/BFL<0.74
-1.0<fR/f<-0.50。
In the conditional expression, IMG HT is the height of the imaging plane, fF is the focal length of the foremost lens of the lens group disposed closest to the object side, fR is the focal length of the rearmost lens of the lens group disposed closest to the imaging plane, LFS1 is the radius of curvature of the object side of the foremost lens, and LRS2 is the radius of curvature of the image side of the rearmost lens.
The lens group according to the first to fifth aspects may have the following characteristics. In an example, the front most lens in the lens group may have positive refractive power. In another example, the last lens in the lens group may have negative refractive power.
The imaging lens system according to the first to fifth aspects may include one or more lenses having the following characteristics, if necessary. In an example, the imaging lens system according to the first aspect may include one of the first to fourth lenses having the following characteristics. In another example, the imaging lens system according to the second aspect may include two or more of the first to fourth lenses having the following characteristics. However, the imaging lens system according to the above aspect may not necessarily include a lens having the following characteristics.
The first lens may have optical power. In an example, the first lens may have positive refractive power. The first lens may have a convex surface. For example, the first lens may have a convex object side. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be 1.5 or more. As a specific example, the refractive index of the first lens may be greater than 1.5 and less than 1.6. The first lens may have a predetermined abbe number. For example, the abbe number of the first lens may be 50 or more. As a specific example, the abbe number of the first lens may be greater than 50 and less than 90. The first lens may have a predetermined focal length. For example, the focal length of the first lens may be determined to be in the range of 10.0mm to 22.0 mm.
The second lens may have optical power. For example, the second lens may have a positive refractive power or a negative refractive power. The second lens may have a convex surface. For example, the second lens may have a convex object side. The second lens may have a predetermined refractive index. In an example, the refractive index of the second lens may be greater than the refractive index of the first lens. The second lens may have a predetermined abbe number. In an example, the abbe number of the second lens may be 20 or more.
The third lens may have a refractive power. For example, the third lens may have positive or negative refractive power. The third lens may have a convex surface. In an example, the third lens may have a convex object side. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be 1.5 or more. As a specific example, the refractive index of the third lens may be greater than 1.5 and less than 1.7.
The fourth lens may have a refractive power. For example, the fourth lens may have a negative refractive power. The fourth lens may have a convex surface. For example, the fourth lens may have a convex object side. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be 1.6 or more. As a specific example, the refractive index of the fourth lens may be greater than 1.6 and less than 1.7. The fourth lens may have a predetermined abbe number. For example, the abbe number of the fourth lens may be 30 or less. As a specific example, the abbe number of the fourth lens may be greater than 20 and less than 30. The fourth lens may have a predetermined focal length. For example, the focal length of the fourth lens may be determined to be in the range of-20.0 mm to-8.0 mm.
The aspherical surfaces of the first to fourth lenses may be represented by the following formula 1. In equation 1, c is the inverse of the radius of curvature of the corresponding lens, k is a conic constant, r is the distance from any point on the aspherical surface of the lens to the optical axis, a to H and J represent aspherical constants, and Z (or SAG) is the distance from any point on the aspherical surface to the vertex of the aspherical surface in the optical axis direction.
Formula 1:
The optical path folding member according to one or more examples may have a structure to adjust the amount of light. In an example, the incident surface and the exit surface of the light path folding member may have a light shielding member that shields light of portions other than the inlet and the outlet, and the light shielding member may be provided on the incident surface and the exit surface of the light path folding member. The entrance and exit may be a light entrance surface and a light exit surface. As a specific example, holes may be provided on the incident surface and the exit surface of the optical path folding member. In another example, a groove may be provided in a partial region of the optical path folding member. In still another example, an inclined surface having an inclination substantially parallel to the reflected light of the optical path folding member may be provided in a partial region of the optical path folding member.
An exemplary electronic device according to the first aspect may have a thin form factor for easy portability or storage. In an example, by way of example only, an electronic device according to an aspect may be a smart phone, a laptop computer, or the like. An electronic device according to one aspect may include a camera module having a long focal length to achieve high resolution. For example, the electronic device may be equipped with a camera module including one of the imaging lens systems according to the first to fourth aspects described above. However, the imaging lens system included in the camera module may not be limited to the imaging lens systems according to the first to fourth aspects described above.
Hereinafter, one or more examples will be described in detail with reference to the accompanying drawings.
First, this description describes an imaging lens system according to a first embodiment with reference to fig. 1.
The exemplary imaging lens system 100 according to the first embodiment may include a lens group LG and an optical path folding member P. However, the components of the imaging lens system 100 are not limited to the above-described members. For example, the imaging lens system 100 may further include a filter IF and an imaging plane IP. The lens group LG and the optical path folding member P may be disposed in order from the object side to the imaging plane. In an example, the lens group LG may be disposed on the object side of the optical path folding member P, and the optical path folding member P may be disposed between the lens group LG and the imaging plane IP.
Next, the above-described components are described in order.
The lens group LG may include a plurality of lenses. In an example, the lens group LG may include a first lens 110, a second lens 120, a third lens 130, and a fourth lens 140 arranged in order from the object side to the imaging plane. The first to fourth lenses 110 to 140 may be arranged at predetermined intervals. For example, the image side of the first lens element 110 may not be in contact with the object side of the second lens element 120, and the image side of the second lens element 120 may not be in contact with the object side of the third lens element 130. However, the first to fourth lenses 110 to 140 may not necessarily be arranged to be spatially separated from each other. For example, the image side of the first lens element 110 can be in contact with the object side of the second lens element 120, and the image side of the second lens element 120 can be in contact with the object side of the third lens element 130.
Next, the description explains the characteristics of the first lens 110 to the fourth lens 140.
The first lens 110 may have a positive refractive power, and may have a convex object side and a concave image side. The second lens 120 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 130 may have a positive refractive power, and may have a convex object side and a concave image side. The fourth lens 140 may have a negative refractive power, and may have a convex object side and a concave image side.
Next, the description explains the optical path folding member P.
The optical path folding member P may include a plurality of prisms P1, P2, and P3. For example, the optical path folding member P may include a first prism P1, a second prism P2, and a third prism P3 sequentially arranged along the optical path. The optical path folding member P may have a plurality of reflecting surfaces. For example, the optical path folding member P may have two reflecting surfaces. As a specific example, one reflection surface may be provided on each of the first prism P1 and the third prism P3.
The light path folding member P can adjust the amount of incident light and the amount of outgoing light. In an example, as shown in fig. 2 to 4, a portion of each of the first, second, and third prisms P1, P2, and P3 except for the inlet EP and the outlet OP may be covered with a light shielding member (e.g., a light shielding film or a light shielding paint).
As shown in fig. 5A, 5B, 5C, 5D, and 5E, the inlet EP and the outlet OP may have various shapes based on the light shielding member. In an example, each of the inlet EP and the outlet OP may be formed in a rectangular direction, as shown in fig. 5A. In another example, each of the inlet EP and the outlet OP may have edges formed in a waveform, as shown in fig. 5B to 5E. The inlet EP and the outlet OP formed in this way may be advantageous in reducing the flare phenomenon.
The entrance EP and the exit OP of the prisms P1, P2 or P3 may have different sizes. In an example, the entrance EP of the prism P1, P2, or P3 may be greater than the exit OP of the prism P1, P2, or P3. The respective inlets EP or outlets OP of the prisms P1, P2 and P3 may have different sizes. In an example, the entrance EP of the first prism P1 may be greater than the entrance EP of the second prism P2, and the entrance EP of the second prism P2 may be greater than the entrance EP of the third prism P3. In another example, the outlet OP of the first prism P1 may be greater than the outlet OP of the second prism P2, and the outlet OP of the second prism P2 may be greater than the outlet OP of the third prism P3. However, the dimensional relationship between the entrance EP and the exit OP of the prisms P1, P2, and P3 is not limited to the above-described form. In an example, the inlets EP of the first to third prisms P1 to P3 may all have the same size. In another example, the outlets OP of the first to third prisms P1 to P3 may all have the same size.
An assembly for adjusting the amount of light may be further provided between the first to third prisms P1 to P3. In an example, the diaphragm may be disposed on at least one of a portion between the first prism P1 and the second prism P2 and a portion between the second prism P2 and the third prism P3.
According to one or more embodiments, the optical path folding member may be modified into the form shown in fig. 6 to 8.
First, a first modification of the optical path folding member will be described with reference to fig. 6.
As shown in fig. 6, the optical path folding member may include one prism P1. The prism P1 may reduce the flare phenomenon. For example, the first groove Pg1 and the second groove Pg2 may be disposed in a partial region of the prism P1. The first groove Pg1 may be disposed in a boundary region between the second surface PS2 and the third surface PS3, and the second groove Pg2 may be disposed in a boundary region between the first surface PS1 and the fourth surface PS 4. The first and second grooves Pg1 and Pg2 may be substantially parallel to the reflected light within the prism P1. In an example, the first inclined surface g1S1 of the first groove Pg1 may be parallel to the light reflected from the second surface PS2, and the second inclined surface g1S2 of the first groove Pg1 may be parallel to the light reflected from the first surface PS 1. In another example, the first inclined surface g2S1 of the second groove Pg2 may be parallel to the light reflected from the first surface PS1, and the second inclined surface g2S2 of the second groove Pg2 may be parallel to the light reflected from the third surface PS 3.
Next, a second modification of the optical path folding member will be described with reference to fig. 7.
As shown in fig. 7, the optical path folding member may include two prisms P1 and P2. The first and second prisms P1 and P2 may be disposed at predetermined intervals. In an example, the distance from the exit surface of the first prism P1 to the entrance surface of the second prism P2 may be 0.05mm to 10mm. In an example, the first prism P1 and the second prism P2 may have different optical characteristics. For example, the first prism P1 and the second prism P2 may have different refractive indexes. In another example, the first prism P1 and the second prism P2 may have different abbe numbers. The optical path folding member including the prisms P1 and P2 having different optical characteristics as described above may be advantageous in improving resolution and aberration of the imaging lens system.
The first and second prisms P1 and P2 may mitigate the flare phenomenon. In an example, the first and second grooves Pg1 and Pg2 may be provided in the first and second prisms P1 and P2, respectively. The first and second grooves Pg1 and Pg2 may be substantially parallel to the reflected light within the optical path folding member. For example, the first inclined surface g1S1 of the first groove Pg1 may be parallel to light reflected from the second surface P1S2 of the first prism P1, and the second inclined surface g1S2 of the first groove Pg1 may be parallel to light reflected from the first surface P1S1 of the first prism P1. In another example, the first inclined surface g2S1 of the second groove Pg2 may be parallel to light reflected from the first surface P1S1 of the first prism P1, and the second inclined surface g2S2 of the second groove Pg2 may be parallel to light reflected from the first surface P2S1 of the second prism P2.
Next, a third modification of the optical path folding member will be described with reference to fig. 8.
As shown in fig. 8, the optical path folding member may include three prisms P1, P2, and P3. The first to third prisms P1 to P3 may be arranged at predetermined intervals. In an example, the distance from the exit surface of the first prism P1 to the entrance surface of the second prism P2 may be 0.05mm to 10mm. In another example, the distance from the exit surface of the second prism P2 to the entrance surface of the third prism P3 may be 0.05mm to 10mm.
The first to third prisms P1 to P3 may have different optical characteristics. In an example, the first to third prisms P1 to P3 may have different refractive indexes. In another example, the first to third prisms P1 to P3 may have different abbe numbers. The optical path folding member including the prisms P1, P2, and P3 having different optical characteristics as described above may be advantageous in improving resolution and aberration of the imaging lens system.
The first to third prisms P1 to P3 may mitigate the flare phenomenon. In an example, the inclined surfaces Pc1, pc21, pc22, and Pc3 may be provided on the first to third prisms P1 to P3, respectively. The inclined surfaces Pc1, pc21, pc22, and Pc3 may be disposed at portions of the first to third prisms P1 to P3 opposite to each other. For example, the first inclined surface Pc1 may be disposed adjacent to the exit surface of the first prism P1, the second inclined surface Pc21 may be disposed adjacent to the entrance surface of the second prism P2, the third inclined surface Pc22 may be disposed adjacent to the exit surface of the second prism P2, and the fourth inclined surface Pc3 may be disposed adjacent to the entrance surface of the third prism P3.
The inclined surfaces Pc1, pc21, pc22, and Pc3 may be substantially parallel to the reflected light within the optical path folding member. In an example, the first inclined surface Pc1 may be parallel to light reflected from the reflective surface P1SR of the first prism P1, the second and third inclined surfaces Pc21 and Pc22 may be parallel to light reflected from the reflective surface P2SR of the second prism P2, and the fourth inclined surface Pc3 may be parallel to light reflected from the reflective surface P3SR of the third prism P3.
The filter IF and the imaging plane IP may be disposed adjacent to the exit surface of the optical path folding member P.
The filter IF may block light of a specific wavelength. For example, the filter IF may block infrared light according to one or more embodiments. However, this is merely an example, and the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.
The imaging plane IP may be provided at a point where light reflected from the optical path folding member P converges or an image IS formed, and may be formed by an image sensor IS or the like. In an example, the imaging plane IP may be formed on or inside the image sensor IS.
The imaging lens system 100 configured as above may show the aberration characteristics shown in fig. 9. Tables 1 and 2 below show lens characteristics and aspherical values of the imaging lens system 100 according to the present embodiment, respectively.
Table 1:
Table 2:
An imaging lens system according to a second embodiment will be described with reference to fig. 10.
The exemplary imaging lens system 200 according to the second embodiment may include a lens group LG and an optical path folding member P. However, the components of the imaging lens system 200 are not limited to the above-described members. In an example, the imaging lens system 200 may further include a filter IF and an imaging plane IP. The lens group LG and the optical path folding member P may be disposed in order from the object side to the imaging plane. In an example, the lens group LG may be disposed on the object side of the optical path folding member P, and the optical path folding member P may be disposed between the lens group LG and the imaging plane IP.
Next, the above-described components are described in order.
The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 210, a second lens 220, a third lens 230, and a fourth lens 240 arranged in order from the object side to the imaging plane. The first to fourth lenses 210 to 240 may be arranged at predetermined intervals. In an example, the image side of the first lens 210 may not be in contact with the object side of the second lens 220, and the image side of the second lens 220 may not be in contact with the object side of the third lens 230. However, the first lens 210 to the fourth lens 240 may not necessarily be arranged to be spatially separated from each other. In an example, the image side of the first lens 210 can be in contact with the object side of the second lens 220, and the image side of the second lens 220 can be in contact with the object side of the third lens 230.
Next, characteristics of the first lens 210 to the fourth lens 240 will be described.
The first lens 210 may have a positive refractive power, and may have a convex object side and a concave image side. The second lens 220 may have a positive refractive power, and may have a convex object side and a concave image side. The third lens 230 may have a positive refractive power, and may have a convex object side and a concave image side. The fourth lens 240 may have a negative refractive power, and may have a convex object side and a concave image side.
Next, the optical path folding member P will be described.
The optical path folding member P may include a plurality of prisms P1 and P3. For example, the optical path folding member P may include a first prism P1 and a third prism P3 sequentially disposed along the optical path. The optical path folding member P may have a plurality of reflecting surfaces. For example, the optical path folding member P may have two reflecting surfaces. As a specific example, one reflection surface may be provided on each of the first prism P1 and the third prism P3.
The light path folding member P can adjust the amount of incident light and the amount of outgoing light. In an example, as shown in fig. 2 to 4, a portion of each of the first and third prisms P1 and P3 other than the inlet EP and the outlet OP may be covered with a light shielding film, a light shielding paint, or the like.
The filter IF and the imaging plane IP may be disposed adjacent to the exit surface of the optical path folding member P.
The filter IF may block light of a specific wavelength. In an example, the filter IF according to the present embodiment may block infrared light. However, this is merely an example, and the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.
The imaging plane IP may be provided at a point where light reflected from the optical path folding member P converges or an image IS formed, and may be formed by an image sensor IS or the like. In an example, the imaging plane IP may be formed on or inside the image sensor IS.
The exemplary imaging lens system 200 configured as above may show aberration characteristics shown in fig. 11. Tables 3 and 4 below show lens characteristics and aspherical values of the exemplary imaging lens system 200 according to the present embodiment, respectively.
Table 3:
table 4:
An exemplary imaging lens system according to a third embodiment will be described with reference to fig. 12.
The exemplary imaging lens system 300 according to the third embodiment may include a lens group LG and an optical path folding member P. However, the components of the imaging lens system 300 are not limited to the above-described members. In an example, the imaging lens system 300 may further include a filter IF and an imaging plane IP. The lens group LG and the optical path folding member P may be disposed in order from the object side to the imaging plane. In an example, the lens group LG may be disposed on the object side of the optical path folding member P, and the optical path folding member P may be disposed between the lens group LG and the imaging plane IP.
Next, the above-described components are described in order.
The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 310, a second lens 320, and a third lens 330 arranged in order from the object side to the imaging plane. The first to third lenses 310 to 330 may be arranged at predetermined intervals. In an example, the image side of the first lens 310 may not be in contact with the object side of the second lens 320, and the image side of the second lens 320 may not be in contact with the object side of the third lens 330. However, the first to third lenses 310 to 330 may not necessarily be arranged to be spatially separated from each other. In an example, the image side of the first lens 310 can be in contact with the object side of the second lens 320, and the image side of the second lens 320 can be in contact with the object side of the third lens 330.
Next, characteristics of the first lens 310 to the third lens 330 will be described.
The first lens 310 may have a positive refractive power, and may have a convex object side and a concave image side. The second lens 320 may have a positive refractive power, and may have a convex object side and a concave image side. The third lens 330 may have a negative refractive power, and may have a convex object side and a concave image side.
Next, the optical path folding member P will be described.
The optical path folding member P may include a plurality of prisms P1, P2, and P3. In an example, the optical path folding member P may include a first prism P1, a second prism P2, and a third prism P3 sequentially arranged along the optical path. The optical path folding member P may have a plurality of reflecting surfaces. In an example, the optical path folding member P may have two reflection surfaces. As a specific example, one reflection surface may be provided on each of the first prism P1 and the third prism P3.
The light path folding member P can adjust the amount of incident light and the amount of outgoing light. In an example, as shown in fig. 2 to 4, a portion of each of the first, second, and third prisms P1, P2, and P3 except for the inlet EP and the outlet OP may be covered with a light shielding film, a light shielding paint, or the like.
The filter IF and the imaging plane IP may be disposed adjacent to the exit surface of the optical path folding member P.
The filter IF may block light of a specific wavelength. In an example, the filter IF according to the present embodiment may block infrared light. However, this is merely an example, and the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.
The imaging plane IP may be provided at a point where light reflected from the optical path folding member P converges or an image IS formed, and may be formed by an image sensor IS or the like. For example, the imaging plane IP may be formed on or in the image sensor IS.
The imaging lens system 300 configured as above may show the aberration characteristics shown in fig. 13. Tables 5 and 6 below show lens characteristics and aspherical values of the imaging lens system 300 according to the present embodiment, respectively.
Table 5:
Table 6:
an exemplary imaging lens system according to a fourth embodiment will be described with reference to fig. 14.
The exemplary imaging lens system 400 according to the present embodiment may include a lens group LG and an optical path folding member P. However, the components of the imaging lens system 400 are not limited to the above-described members. In an example, the imaging lens system 400 may further include a filter IF and an imaging plane IP. The lens group LG and the optical path folding member P may be disposed in order from the object side to the imaging plane. In an example, the lens group LG may be disposed on the object side of the optical path folding member P, and the optical path folding member P may be disposed between the lens group LG and the imaging plane IP.
Next, the above-described components are described in order.
The lens group LG may include a plurality of lenses. In an example, the lens group LG may include a first lens 410, a second lens 420, and a third lens 430 arranged in order from the object side to the imaging plane. The first to third lenses 410 to 430 may be arranged at predetermined intervals. For example, the image side of the first lens element 410 may not be in contact with the object side of the second lens element 420, and the image side of the second lens element 420 may not be in contact with the object side of the third lens element 430. However, the first to third lenses 410 to 430 may not necessarily be arranged to be spatially separated from each other. In an example, the image side of the first lens 410 can be in contact with the object side of the second lens 420, and the image side of the second lens 420 can be in contact with the object side of the third lens 430.
Next, characteristics of the first lens 410 to the third lens 430 will be described.
The first lens 410 may have a positive refractive power, and may have a convex object side and a concave image side. The second lens 420 may have a positive refractive power and may have a convex object side and a concave image side. The third lens 430 may have a negative refractive power and may have a convex object side and a concave image side.
Next, the optical path folding member P will be described.
The optical path folding member P may include a plurality of prisms P1 and P3. In an example, the optical path folding member P may include a first prism P1 and a third prism P3 sequentially disposed along the optical path. The optical path folding member P may have a plurality of reflecting surfaces. In an example, the optical path folding member P may have two reflection surfaces. As a specific example, one reflection surface may be provided on each of the first prism P1 and the third prism P3.
The light path folding member P can adjust the amount of incident light and the amount of outgoing light. In an example, as shown in fig. 2 to 4, a portion of each of the first and third prisms P1 and P3 other than the inlet EP and the outlet OP may be covered with a light shielding film, a light shielding paint, or the like.
The filter IF and the imaging plane IP may be disposed adjacent to the exit surface of the optical path folding member P.
The filter IF may block light of a specific wavelength. In an example, the filter IF according to the present embodiment may block infrared light. However, this is merely an example, and the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.
The imaging plane IP may be provided at a point where light reflected from the optical path folding member P converges or an image IS formed, and may be formed by an image sensor IS or the like. In an example, the imaging plane IP may be formed on or inside the image sensor IS.
The imaging lens system 400 configured as above may show the aberration characteristics shown in fig. 15. Tables 7 and 8 below show lens characteristics and aspherical values of the imaging lens system 400 according to the present embodiment, respectively.
Table 7:
Table 8:
an exemplary imaging lens system according to a fifth embodiment will be described with reference to fig. 16.
The exemplary imaging lens system 500 according to the fifth embodiment may include a lens group LG and an optical path folding member P (P1 and P3). However, the components of the imaging lens system 500 are not limited to the above-described components. For example, the imaging lens system 500 may further include a filter IF and an imaging plane IP. The lens group LG and the optical path folding member P may be disposed in order from the object side to the imaging plane. In an example, the lens group LG may be disposed on the object side of the optical path folding member P, and the optical path folding member P may be disposed between the lens group LG and the imaging plane IP.
Next, the above-described components are described in order.
The lens group LG may include a plurality of lenses. In an example, the lens group LG may include a first lens 510, a second lens 520, a third lens 530, and a fourth lens 540 arranged in order from the object side to the imaging plane. The first to fourth lenses 510 to 540 may be arranged at predetermined intervals. In an example, the image side of the first lens 510 may not be in contact with the object side of the second lens 520, and the image side of the second lens 520 may not be in contact with the object side of the third lens 530. However, the first to fourth lenses 510 to 540 may not necessarily be arranged to be spatially separated from each other. In an example, the image side of the first lens 510 can be in contact with the object side of the second lens 520, and the image side of the second lens 520 can be in contact with the object side of the third lens 530.
Next, characteristics of the first lens 510 to the fourth lens 540 will be described.
The first lens 510 may have a positive refractive power, and may have a convex object side and a concave image side. The second lens 520 may have positive refractive power, and may have a convex object side and a concave image side. The third lens 530 may have a positive refractive power, and may have a convex object side and a concave image side. The fourth lens 540 may have a negative refractive power, and may have a convex object side and a concave image side.
Next, the optical path folding members P (P1 and P3) will be described.
The optical path folding member P may include a plurality of prisms P1 and P3. In an example, the optical path folding member P may include a first prism P1 and a third prism P3 sequentially disposed along the optical path. The optical path folding member P may have a plurality of reflecting surfaces. In an example, the optical path folding member P may have four reflection surfaces. As a specific example, two reflection surfaces may be provided on each of the first prism P1 and the third prism P3.
The light path folding member P can adjust the amount of incident light and the amount of outgoing light. In an example, a portion of each of the first and third prisms P1 and P3 other than the incident and exit regions may be covered with a light shielding film, a light shielding paint, or the like.
The filter IF and the imaging plane IP may be disposed adjacent to the exit surface of the optical path folding member P.
The filter IF may block light of a specific wavelength. In an example, the filter IF according to the present embodiment may block infrared light. However, this is merely an example, and the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.
The imaging plane IP may be provided at a point where light reflected from the optical path folding member P converges or an image IS formed, and may be formed by an image sensor IS or the like. In an example, the imaging plane IP may be formed on or inside the image sensor IS.
The exemplary imaging lens system 500 configured as above may show aberration characteristics shown in fig. 17. Tables 9 and 10 below show lens characteristics and aspherical values of the imaging lens system 500 according to the present embodiment, respectively.
Table 9:
Table 10:
an exemplary imaging lens system according to a sixth embodiment will be described with reference to fig. 18.
The exemplary imaging lens system 600 according to the sixth embodiment may include a lens group LG and an optical path folding member P. However, the components of the imaging lens system 600 are not limited to the above-described components. In an example, the imaging lens system 600 may further include a filter IF and an imaging plane IP. The lens group LG and the optical path folding member P may be disposed in order from the object side to the imaging plane. In an example, the lens group LG may be disposed on the object side of the optical path folding member P, and the optical path folding member P may be disposed between the lens group LG and the imaging plane IP.
Next, the above-described components are described in order.
The lens group LG may include a plurality of lenses. In an example, the lens group LG may include a first lens 610, a second lens 620, a third lens 630, and a fourth lens 640, which are arranged in order from the object side to the imaging plane. The first to fourth lenses 610 to 640 may be arranged at predetermined intervals. In an example, the image side of the first lens 610 may not be in contact with the object side of the second lens 620, and the image side of the second lens 620 may not be in contact with the object side of the third lens 630. However, the first to fourth lenses 610 to 640 may not necessarily be arranged to be spatially separated from each other. For example, the image side of the first lens 610 can be in contact with the object side of the second lens 620, and the image side of the second lens 620 can be in contact with the object side of the third lens 630.
Next, characteristics of the first lens 610 to the fourth lens 640 will be described.
The first lens 610 may have a positive refractive power and may have a convex object side and a concave image side. The second lens 620 may have a positive refractive power, and may have a convex object side and a concave image side. The third lens 630 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 640 may have a negative refractive power, and may have a convex object side and a concave image side.
Next, the optical path folding member P will be described.
The optical path folding member P may include a plurality of prisms P1 and P3. In an example, the optical path folding member P may include a first prism P1 and a third prism P3 sequentially disposed along the optical path. The optical path folding member P may have a plurality of reflecting surfaces. In an example, the optical path folding member P may have four reflection surfaces. As a specific example, two reflection surfaces may be provided on each of the first prism P1 and the third prism P3.
The light path folding member P can adjust the amount of incident light and the amount of outgoing light. In an example, a portion of each of the first and third prisms P1 and P3 other than the incident and exit regions may be covered with a light shielding film, a light shielding paint, or the like.
The filter IF and the imaging plane IP may be disposed adjacent to the exit surface of the optical path folding member P.
The filter IF may block light of a specific wavelength. In an example, the filter IF according to the present embodiment may block infrared light. However, this is merely an example, and the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.
The imaging plane IP may be provided at a point where light reflected from the optical path folding member P converges or an image IS formed, and may be formed by an image sensor IS or the like. In an example, the imaging plane IP may be formed on or inside the image sensor IS.
The exemplary imaging lens system 600 configured as above may show aberration characteristics shown in fig. 19. Tables 11 and 12 below show lens characteristics and aspherical values of the imaging lens system 600 according to the present embodiment, respectively.
Table 11:
| Face numbering | Assembly | Radius of curvature | Thickness/distance | Refractive index | Abbe number |
| S1 | First lens | 6.5295 | 1.400 | 1.537 | 55.7 |
| S2 | | 71.2541 | 0.300 | | |
| S3 | Second lens | 33.5535 | 0.600 | 1.668 | 20.4 |
| S4 | | 36.8741 | 0.200 | | |
| S5 | Third lens | 15.2751 | 0.600 | 1.546 | 56.0 |
| S6 | | 38.0680 | 0.150 | | |
| S7 | Fourth lens | 5.7571 | 0.500 | 1.668 | 20.4 |
| S8 | | 3.7105 | 1.000 | | |
| S9 | First prism | Infinity of infinity | 2.000 | 1.519 | 64.2 |
| S10 | | Infinity of infinity | 3.111 | 1.519 | 64.2 |
| S11 | | Infinity of infinity | 2.900 | 1.519 | 64.2 |
| S12 | | Infinity of infinity | 0.500 | | |
| S13 | Third prism | Infinity of infinity | 2.900 | 1.519 | 64.2 |
| S14 | | Infinity of infinity | 3.800 | 1.519 | 64.2 |
| S15 | | Infinity of infinity | 2.440 | 1.519 | 64.2 |
| S16 | | Infinity of infinity | 0.300 | | |
| S17 | Optical filter | Infinity of infinity | 0.210 | 1.519 | 64.2 |
| S18 | | Infinity of infinity | 0.096 | | |
| S19 | Imaging surface | Infinity of infinity | 0.004 | | |
Table 12:
Tables 13 to 15 below show optical characteristic values and conditional expression values of the imaging lens systems according to the first to sixth exemplary embodiments described above, respectively.
Table 13:
Table 14:
Table 15:
An exemplary electronic device in accordance with one or more embodiments will be described with reference to fig. 20.
An exemplary electronic device according to one or more embodiments may include an exemplary imaging lens system according to one aspect. In an example, the electronic device may include one or more exemplary imaging lens systems according to the first to sixth embodiments. As a specific example, an exemplary electronic device may include the imaging lens system 100 according to the first embodiment.
As an example, an exemplary electronic device according to an embodiment may be a portable terminal 1000 as shown in fig. 20. However, the type of the electronic device is not limited to the portable terminal 1000. In an example, an electronic device according to another embodiment may be a laptop computer.
The portable terminal 1000 may include one or more camera modules 10 and 20. In an example, two camera modules 10 and 20 may be installed in the main body 1002 of the portable terminal 1000 at predetermined intervals. The first camera module 10 and the second camera module 20 may capture objects in the same direction. In an example, the first camera module 10 and the second camera module 20 may be mounted on one surface of the portable terminal 1000.
At least one of the first camera module 10 and the second camera module 20 may include an exemplary imaging lens system according to one of the first to sixth embodiments. In an example, the first camera module 10 may include the imaging lens system 100 according to the first embodiment.
The first camera module 10 may capture an image of an object disposed at a long distance. In other words, the focal length of the first camera module 10 may be greater than the focal length of the second camera module 20.
As described above, one or more examples may provide an imaging lens system that reduces or prevents a flare phenomenon that may be caused by an optical path folding member.
While this disclosure includes particular examples, it will be apparent to those skilled in the art after understanding the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered as illustrative only and not for the purpose of limitation. The descriptions of features or aspects in each example are considered to be applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order and/or if components in the described systems, architectures, devices or circuits are combined in a different manner and/or are replaced or supplemented by other components or their equivalents.
Therefore, the scope of the present disclosure may be defined by the claims and their equivalents, in addition to the above disclosure, and all changes that come within the scope of the claims and their equivalents are to be interpreted as being included in the present disclosure.