Disclosure of Invention
An aspect of the present application provides an optical lens comprising, in order from an object side to an image side along an optical axis, a first lens element having negative optical power, an object side being convex, an image side being concave, a second lens element having negative optical power, an image side being convex, an object side being positive optical power, an object side being convex, an image side being convex, a fourth lens element having optical power, a fifth lens element having positive optical power, an object side being convex, an image side being convex, an sixth lens element having negative optical power, an object side being concave, an image side being convex, and a seventh lens element having positive optical power.
In one embodiment, the fourth lens element has a concave object-side surface and a convex image-side surface.
In one embodiment, the fourth lens element has a convex object-side surface and a concave image-side surface.
In one embodiment, the fourth lens element has a concave object-side surface and a concave image-side surface.
In one embodiment, the object side surface of the seventh lens is convex, and the image side surface is concave.
In one embodiment, the object side surface of the seventh lens is concave, and the image side surface is convex.
In one embodiment, the object side surface of the seventh lens is convex, and the image side surface is convex.
In one embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens.
In one embodiment, the first lens is an aspherical lens.
In one embodiment, the fourth lens and the seventh lens are each aspherical lenses.
In one embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy |R3/R4|+.15.
In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens meet the condition that TTL/F is less than or equal to 9.
In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, the maximum field angle FOV of the optical lens and the image height H corresponding to the maximum field angle FOV satisfy that TTL/H/FOV is less than or equal to 0.06.
In one embodiment, the maximum field angle FOV of the optical lens, the maximum aperture D of the object side surface of the first lens corresponding to the maximum field angle FOV, and the image height H corresponding to the maximum field angle FOV satisfy D/H/FOV less than or equal to 0.025.
In one embodiment, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy 0.1.ltoreq.F5/F6.ltoreq.1.6.
In one embodiment, the maximum value p of the ratio of the center thicknesses of any two lenses from the first lens to the seventh lens on the optical axis satisfies that 2.ltoreq.p.ltoreq.8.
In one embodiment, the radius of curvature R13 of the object side of the seventh lens and the radius of curvature R14 of the image side of the seventh lens satisfy |R13/R14|+.15.
In one embodiment, the combined focal length F56 of the fifth lens and the sixth lens and the total effective focal length F of the optical lens satisfy 3.ltoreq.F56/F.ltoreq.10.
In one embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle FOV satisfy (fov×f)/h+..
In one embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy 0.02.ltoreq.R 3-R4)/(R3+R4). Ltoreq.0.4.
In one embodiment, the total effective focal length F of the optical lens and the curvature radius R1 of the object side surface of the first lens meet the condition that the ratio of F to R1 is less than or equal to 1.5.
In one embodiment, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy R1/R2.ltoreq.30.
In one embodiment, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy that F/H is less than or equal to 3.
Another aspect of the present application provides an optical lens sequentially comprising, from an object side to an image side along an optical axis, a first lens having negative optical power, a second lens having negative optical power, a third lens having positive optical power, a fifth lens having positive optical power, a sixth lens having negative optical power, and a seventh lens having positive optical power, wherein a radius of curvature R1 of an object side of the first lens and a radius of curvature R2 of an image side of the first lens satisfy R1/R2 is 30 or less.
In one embodiment, the object side surface of the first lens is convex, and the image side surface is concave.
In one embodiment, the object side surface of the second lens is concave, and the image side surface is convex.
In one embodiment, the object side surface of the third lens element is convex, and the image side surface is convex.
In one embodiment, the fourth lens element has a concave object-side surface and a convex image-side surface.
In one embodiment, the fourth lens element has a convex object-side surface and a concave image-side surface.
In one embodiment, the fourth lens element has a concave object-side surface and a concave image-side surface.
In one embodiment, the object side surface of the fifth lens element is convex, and the image side surface is convex.
In one embodiment, the object side surface of the sixth lens element is concave, and the image side surface is convex.
In one embodiment, the object side surface of the seventh lens is convex, and the image side surface is concave.
In one embodiment, the object side surface of the seventh lens is concave, and the image side surface is convex.
In one embodiment, the object side surface of the seventh lens is convex, and the image side surface is convex.
In one embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens.
In one embodiment, the first lens is an aspherical lens.
In one embodiment, the fourth lens and the seventh lens are each aspherical lenses.
In one embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy |R3/R4|+.15.
In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens meet the condition that TTL/F is less than or equal to 9.
In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, the maximum field angle FOV of the optical lens and the image height H corresponding to the maximum field angle FOV satisfy that TTL/H/FOV is less than or equal to 0.06.
In one embodiment, the maximum field angle FOV of the optical lens, the maximum aperture D of the object side surface of the first lens corresponding to the maximum field angle FOV, and the image height H corresponding to the maximum field angle FOV satisfy D/H/FOV less than or equal to 0.025.
In one embodiment, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy 0.1.ltoreq.F5/F6.ltoreq.1.6.
In one embodiment, the maximum value p of the ratio of the center thicknesses of any two lenses from the first lens to the seventh lens on the optical axis satisfies that 2.ltoreq.p.ltoreq.8.
In one embodiment, the radius of curvature R13 of the object side of the seventh lens and the radius of curvature R14 of the image side of the seventh lens satisfy |R13/R14|+.15.
In one embodiment, the combined focal length F56 of the fifth lens and the sixth lens and the total effective focal length F of the optical lens satisfy 3.ltoreq.F56/F.ltoreq.10.
In one embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle FOV satisfy (fov×f)/h+..
In one embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy 0.02.ltoreq.R 3-R4)/(R3+R4). Ltoreq.0.4.
In one embodiment, the total effective focal length F of the optical lens and the curvature radius R1 of the object side surface of the first lens meet the condition that the ratio of F to R1 is less than or equal to 1.5.
In one embodiment, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy that F/H is less than or equal to 3.
The application adopts seven lenses, and the optical lens has at least one beneficial effects of high resolution, low cost, miniaturization, small caliber, small CRA, good temperature performance and the like by optimally setting the shape, the focal power and the like of each lens.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region, and if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is referred to as the object side of the lens, and the surface of each lens closest to the imaging side is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
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 application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
In an exemplary embodiment, the optical lens includes, for example, seven lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in order from the object side to the image side along the optical axis.
In an exemplary embodiment, the optical lens may further include a photosensitive element disposed at the imaging surface. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).
The first lens may have negative power and have a meniscus shape, an object-side surface thereof may be convex, and an image-side surface thereof may be concave. This optical power and area configuration of the first lens is advantageous for collecting incident light rays of a large angle of view, so that more light rays smoothly enter the rear optical system, thereby increasing luminous flux and improving imaging quality of the optical system. In practical application, the vehicle-mounted lens is generally exposed in an external environment, and the meniscus lens protruding to the object side is favorable for rain and snow to slide along the lens, so that the service life of the lens is prolonged, and adverse effects of rain and snow on imaging of the lens are reduced.
The second lens element may have negative refractive power, and the object-side surface thereof may be concave while the image-side surface thereof is convex. The focal power and the surface configuration of the second lens are beneficial to enabling light to stably enter the rear optical system, improving the resolution quality of the optical system, collecting more incident light with a large angle of view, enabling the incident light to enter the rear optical system, and increasing luminous flux.
The third lens may have positive optical power, and the object side surface and the image side surface thereof may be convex at the same time. The focal power of the third lens is positive, which is beneficial to light convergence, reducing the caliber and the length of the optical lens barrel and realizing miniaturization of the lens.
The fourth lens element may have positive or negative optical power, wherein the object-side surface thereof may be concave, while the image-side surface thereof may be convex, or wherein the object-side surface thereof may be convex, while the image-side surface thereof may be concave, or wherein the object-side surface and the image-side surface thereof are concave. The fourth lens is arranged in the optical system, so that aberration generated by the front lens group can be corrected, light beams can be converged, the aperture of the lens can be enlarged, the optical system can be more compact in structure, the total length of the lens can be shortened, and the optical system has a relatively short total length.
The fifth lens element may have positive optical power, and both the object-side and image-side surfaces thereof may be convex.
The sixth lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex.
The seventh lens element may have positive refractive power, wherein the object-side surface thereof may be convex, and the image-side surface thereof may be concave, or wherein the object-side surface thereof may be concave, and wherein the image-side surface thereof and the object-side surface thereof are convex. This power and surface configuration of the seventh lens is advantageous in making the front ray walk flat, reducing CRA, and improving the system resolution quality.
In an exemplary embodiment, a stop for limiting the light beam may be provided between the second lens and the third lens to further improve the imaging quality of the optical lens. The diaphragm is beneficial to effectively converging light rays entering the optical system, shortening the overall length of the system and reducing the caliber of the lens. In the embodiment of the present application, the stop may be disposed near the image side of the second lens or near the object side of the third lens. It should be noted, however, that the locations of the diaphragms disclosed herein are merely exemplary and not limiting, and that in alternative embodiments the diaphragms may be located at other locations as desired.
In an exemplary embodiment, the optical lens according to the present application may further include a filter disposed between the seventh lens and the imaging plane to filter light rays having different wavelengths, as needed. The optical lens according to the present application may further include a protective glass disposed between the seventh lens and the imaging plane to prevent an image Fang Yuanjian (e.g., a chip) of the optical lens from being damaged.
As known to those skilled in the art, cemented lenses may be used to minimize chromatic aberration or eliminate chromatic aberration. The use of the cemented lens in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby improving the imaging definition of the lens. In addition, the use of the cemented lens can also simplify the assembly procedure in the lens manufacturing process.
In an exemplary embodiment, the fifth lens and the sixth lens are cemented to form a cemented lens. The fifth lens with the convex object side and the concave image side are glued with the sixth lens with the convex image side, so that light rays emitted by the fourth lens can be smoothly transited to an imaging plane, the total length of the optical system is reduced, various aberrations of the optical system can be corrected, and the optical performances of improving the resolution of the system, optimizing the distortion, CRA and the like on the premise of compact structure of the optical system are realized. The above-mentioned lenses adopt a gluing mode, and have at least one of the following advantages of reducing self-chromatic aberration, reducing tolerance sensitivity, balancing the overall chromatic aberration of the system through residual partial chromatic aberration, reducing the air interval between two lenses, reducing the total length of the system, reducing assembly components between lenses, reducing working procedures and cost, reducing tolerance sensitivity problems of lens units such as inclination/eccentric core and the like generated in the assembly process, improving the production yield, reducing light quantity loss caused by reflection between lenses, improving illumination, further reducing field curvature, and effectively correcting off-axis aberration of the optical lens. The gluing design shares the whole chromatic aberration correction of the system, effectively corrects the aberration, improves the resolution, ensures that the whole optical system is compact, and meets the miniaturization requirement.
In an exemplary embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy +.R3/R4 +.15, e.g., +.R3/R4 +.8. The proportional relation between the curvature radius of the object side surface of the second lens and the curvature radius of the image side surface of the second lens is reasonably set, so that the curvature radius of the object side surface of the lens is similar to the curvature radius of the image side surface or the shape of the object side surface is more curved than the image side surface, thereby being beneficial to correcting the aberration of an optical system and improving the image quality.
In an exemplary embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis and the total effective focal length F of the optical lens satisfy that TTL/F is less than or equal to 9, for example, TTL/F is less than or equal to 8. In the present application, the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis is also referred to as the total length of the optical lens. The proportional relation between the total length and the total effective focal length of the optical lens is reasonably controlled, so that the optical lens has better performance, and miniaturization of the lens is realized.
In an exemplary embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens, the maximum field angle FOV of the optical lens, and the image height H corresponding to the maximum field angle FOV satisfy TTL/H/FOV.ltoreq.0.06, e.g., TTL/H/FOV.ltoreq.0.05. The mutual relation among the three is reasonably arranged, so that miniaturization of the lens is facilitated, and the optical system has smaller lens size under the condition of the same imaging surface and the same image height.
In an exemplary embodiment, the maximum field angle FOV of the optical lens, the maximum aperture D of the object side of the first lens corresponding to the maximum field angle FOV, and the image height H corresponding to the maximum field angle FOV satisfy D/H/FOV.ltoreq.0.025, e.g., D/H/FOV.ltoreq.0.02. The interrelation among the three is reasonably arranged, so that the front end caliber of the optical lens is easy to be reduced, and the miniaturization is realized.
In an exemplary embodiment, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy 0.1.ltoreq.F5/F6.ltoreq.1.6, for example, 0.1.ltoreq. |F5/F6.ltoreq.1.5. The proportional relation between the effective focal length of the fifth lens and the effective focal length of the sixth lens is reasonably set, so that the focal lengths of the fifth lens and the sixth lens are similar, smooth transition of light rays is facilitated, and chromatic aberration of the system is corrected.
In an exemplary embodiment, the maximum value p in the ratio of the center thicknesses of any two lenses of the first lens to the seventh lens on the optical axis satisfies 2.ltoreq.p.ltoreq.8, for example, 3.ltoreq.p.ltoreq.7.2. The ratio of the thicknesses of the centers of any two lenses from the first lens to the seventh lens on the optical axis is between 2 and 8 (comprising 2 and 8), so that the thicknesses among the lenses in the optical lens are uniform, and the effect of each lens is stable. In a high-low temperature change environment, the light change in the optical system is small, so that the optical system has good temperature adaptability.
In an exemplary embodiment, the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy +.15 for R13/R14, e.g., +.8 for R13/R14. The proportional relation between the curvature radius of the object side surface of the seventh lens and the curvature radius of the image side surface of the seventh lens is reasonably set, so that the curvature radii of the object side surface and the image side surface of the lens are similar, light can smoothly enter the optical system, and the resolution quality of the system is improved.
In an exemplary embodiment, the combined focal length F56 of the fifth lens and the sixth lens and the total effective focal length F of the optical lens satisfy 3.ltoreq.F56/F.ltoreq.10, for example, 3.ltoreq.F56/F.ltoreq.9.5. And the proportional relation between the combined focal length of the fifth lens and the sixth lens and the total effective focal length of the optical lens is reasonably set, so that the thermal compensation of the system is facilitated.
In an exemplary embodiment, the maximum field angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field angle FOV satisfy (fov×f)/h+.50, for example, (fov×f)/h+.55. The mutual relation of the three is reasonably arranged, so that the optical lens has the characteristics of large field angle and long focus, and the resolution of large angle is realized.
In an exemplary embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy 0.02.ltoreq.R 3-R4)/(R3+R4). Ltoreq.0.4, for example, 0.03.ltoreq.R 3-R4)/(R3+R4). Ltoreq.0.3. The radius of curvature of the object side surface of the second lens and the radius of curvature of the image side surface of the second lens meet the relationship, so that the aberration of the optical system can be corrected, and when the light rays emitted from the second lens are incident on the object side surface of the third lens, the incident angle of the light rays is not too large, so that the tolerance sensitivity of the optical system is reduced. If the numerical limit of the above-mentioned conditional expression exceeds the upper limit value, the aberration of the optical system may not be sufficiently corrected, and if the numerical limit of the above-mentioned conditional expression is below the lower limit value, the incident angle when the light emitted from the first lens is incident on the object side surface of the second lens may be excessively large, which may increase the sensitivity of the optical system.
In an exemplary embodiment, the total effective focal length F of the optical lens and the radius of curvature R1 of the object side of the first lens satisfy +.F/R1 +.1.5, e.g., +.F/R1 +.1. The proportional relation between the total effective focal length of the optical lens and the curvature radius of the object side surface of the first lens is reasonably set, so that the problem that the curvature of the object side surface of the first lens is too small, aberration is generated due to the too small curvature of the object side surface when light is incident is avoided, and the processing and manufacturing of the first lens are facilitated.
In an exemplary embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy R1/R2.ltoreq.30, e.g., R1/R2.ltoreq.20. The proportional relation between the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens is reasonably set, the special shape setting of the first lens is met, and the improvement of the resolution of the optical system is facilitated.
In an exemplary embodiment, the total effective focal length F of the optical lens corresponds to an image height H corresponding to the maximum field angle of the optical lens such that F/H.ltoreq.3, e.g., F/H.ltoreq.2. The proportional relation between the total effective focal length of the optical lens and the image height corresponding to the maximum field angle of the optical lens is reasonably set, so that the optical lens meets the above conditions, the long focal length characteristic of the optical system is realized, and the resolution of the optical system is improved.
In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy |F1/F|ε 1, e.g., 1.ltoreq.F1/F|.ltoreq.50. The proportional relation between the effective focal length of the first lens and the total effective focal length of the optical lens is reasonably set, so that more light rays can smoothly enter the optical system, and the illuminance of the optical system is improved.
In an exemplary embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy |F2/F|ε 1, e.g., 1+|F2/F|+.ltoreq.95. And the proportional relation between the effective focal length of the second lens and the total effective focal length of the optical lens is reasonably set, so that various aberrations in the optical system can be balanced.
In an exemplary embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy |F3/F|ε 1, e.g., 1.ltoreq.F3/F|.ltoreq.50. And the proportional relation between the effective focal length of the third lens and the total effective focal length of the optical lens is reasonably set, so that various aberrations in the optical system can be balanced.
In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy |F4/F|ε 1, e.g., 1.ltoreq.F4/F|.ltoreq.50. And the proportional relation between the effective focal length of the fourth lens and the total effective focal length of the optical lens is reasonably set, so that various aberrations in the optical system can be balanced.
In an exemplary embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the optical lens satisfy |F5/F|ε.0.05, e.g., 0.05+.ltoreq.F5/F|+.50. And the proportional relation between the effective focal length of the fifth lens and the total effective focal length of the optical lens is reasonably set, so that various aberrations in the optical system can be balanced.
In an exemplary embodiment, the effective focal length F6 of the sixth lens and the total effective focal length F of the optical lens satisfy |F6/F|ε 1, e.g., 1.ltoreq.F6/F|.ltoreq.50. And the proportional relation between the effective focal length of the sixth lens and the total effective focal length of the optical lens is reasonably set, so that various aberrations in the optical system can be balanced.
In an exemplary embodiment, the effective focal length F7 of the seventh lens and the total effective focal length F of the optical lens satisfy |F7/F|ε 1, e.g., 1.ltoreq.F/F|.ltoreq.50. And the proportional relation between the effective focal length of the seventh lens and the total effective focal length of the optical lens is reasonably set, so that various aberrations in the optical system can be balanced.
In an exemplary embodiment, the first lens, the fourth lens, and the seventh lens are all aspherical lenses. The aspherical lens is characterized in that the curvature is continuously changed from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, aberration generated during imaging can be eliminated as much as possible, and therefore imaging quality of the lens is improved. The arrangement of the aspheric lens is helpful for correcting system aberration and improving resolution. Specifically, at least one lens of the first lens, the fourth lens and the seventh lens is an aspheric lens, which is beneficial to improving the resolution quality of the optical system.
According to the optical lens of the embodiment of the application, through reasonable arrangement of the shape and the focal power of each lens, under the condition of using only 7 lenses, the higher resolution quality of the optical system is realized, and meanwhile, the requirements of small size, low sensitivity and high production yield of the lens are met. The optical lens has the characteristics of smaller CRA, is beneficial to avoiding light rays from striking the lens barrel to generate stray light when exiting from the rear end of the system, can well match with a vehicle-mounted chip, and avoids the phenomena of color cast and dark angle. Meanwhile, the optical lens has the advantages of good temperature adaptability, small imaging effect change under high and low temperature environments, stable image quality and contribution to accurate distance measurement of the binocular heads.
According to the optical lens provided by the embodiment of the application, the cemented lens is arranged to share the whole chromatic aberration correction of the system, so that the aberration of the system is corrected, the resolution quality of the system is improved, the whole structure of the optical system is compact, and the miniaturization requirement is met.
In an exemplary embodiment, the first to seventh lenses in the optical lens may be each made of glass. The optical lens made of glass can inhibit the shift of the back focus of the optical lens along with the change of temperature, so as to improve the stability of the system. Meanwhile, the adoption of the glass material can avoid the influence on the normal use of the lens due to the imaging blurring of the lens caused by the high and low temperature change in the use environment. In particular, when the importance is attached to annotating image quality and reliability, the first lens to the seventh lens may each be a glass aspherical lens. Of course, in applications with low requirements for temperature stability, the first lens to the seventh lens in the optical lens may be made of plastic. The optical lens is made of plastic, so that the manufacturing cost can be effectively reduced.
However, those skilled in the art will appreciate that the various results and advantages described in this specification can be obtained by changing the number of lenses making up a lens barrel without departing from the technical solution claimed in the present application. For example, although seven lenses are described as an example in the embodiment, the optical lens is not limited to include seven lenses. The optical lens may also include other numbers of lenses, if desired.
Specific examples of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic configuration of an optical lens according to embodiment 1 of the present application.
As shown in fig. 1, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.
The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has a meniscus lens element with negative refractive power, a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 has a positive refractive power, a concave object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a negative refractive power, a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a meniscus lens with positive optical power, and has a convex object-side surface S13 and a concave image-side surface S14. The fifth lens L5 and the sixth lens L6 may be cemented to constitute cemented lenses.
The optical lens may further include a stop STO, which may be disposed between the second lens L2 and the third lens L3 to improve imaging quality. For example, the stop STO may be disposed near the object side surface S4 of the second lens L2.
In the present embodiment, the object side surface and the image side surface of each of the first lens L1, the fourth lens L4, and the seventh lens L7 may be aspherical.
Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side surface S15 and an image side surface S16, the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensing chip IMA located at the imaging surface S17. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 1 shows the radius of curvature R, thickness T (it is understood that the thickness T in the line of S1 is the center thickness of the first lens L1, the thickness T in the line of S2 is the air gap d12 between the first lens L1 and the second lens L2, and so on), refractive index Nd, and abbe number Vd of each lens of the optical lens of embodiment 1.
TABLE 1
In this embodiment, seven lenses are taken as an example, and at least one of the beneficial effects of high resolution, miniaturization, small front end caliber, small CRA, good temperature performance and the like can be achieved by reasonably distributing the focal power and the surface shape of each lens, the center thickness of each lens and the air interval between each lens. Each aspherical surface profile Z is defined by the following formula:
where Z is the distance vector height of the aspherical surface at a position h in the optical axis direction, c is the paraxial curvature of the aspherical surface, c=1/R (i.e., paraxial curvature c is the reciprocal of the radius of curvature R in table 1 above), k is the conic coefficient conic, and A, B, C, D, E, F are the higher order coefficients. Table 2 below shows cone coefficients K and higher order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S3, S4, S8, S9, S13 and S14 in example 1.
| Face number | K | A | B | C | D | E | F |
| S1 | -8.6121 | -5.0316E-03 | 3.9273E-04 | -1.7811E-05 | 4.6377E-07 | -5.3068E-09 | -3.3430E-12 |
| S2 | -1.0931 | -8.9657E-03 | 1.3765E-03 | -1.0080E-04 | 5.4080E-06 | 2.2167E-09 | 2.3398E-09 |
| S8 | 1.3447 | 1.0766E-04 | 9.3327E-06 | 3.9776E-06 | -1.0435E-07 | -3.6960E-09 | -5.0236E-10 |
| S9 | 0.5701 | 9.9179E-05 | 5.5981E-05 | 1.7244E-06 | -3.5205E-09 | -6.9574E-09 | 1.6033E-10 |
| S13 | -5.0799 | -2.7587E-03 | 3.3126E-05 | 1.4172E-06 | -6.0270E-09 | 1.6360E-09 | -1.4752E-10 |
| S14 | -64.7854 | -3.2058E-03 | 5.7797E-05 | 4.9622E-07 | -2.1064E-08 | 1.8172E-09 | -2.4383E-11 |
TABLE 2
Example 2
An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 2 shows a schematic configuration of an optical lens according to embodiment 2 of the present application.
As shown in fig. 2, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.
The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has a meniscus lens element with negative refractive power, a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 has a meniscus lens element with negative refractive power, and has a concave object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a negative refractive power, a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a meniscus lens with positive optical power, and has a convex object-side surface S13 and a concave image-side surface S14. The fifth lens L5 and the sixth lens L6 may be cemented to constitute cemented lenses.
The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality.
In the present embodiment, the object side surface and the image side surface of each of the first lens L1, the fourth lens L4, and the seventh lens L7 may be aspherical.
Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side surface S15 and an image side surface S16, the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensing chip IMA located at the imaging surface S17. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 3 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2.
TABLE 3 Table 3
The cone coefficients K and the higher order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 2 are given in table 4 below.
| Face number | K | A | B | C | D | E | F |
| S1 | 0.1253 | -5.1880E-03 | 3.5150E-04 | -1.7414E-05 | 4.5977E-07 | -5.6025E-09 | 6.0397E-12 |
| S2 | -0.4627 | -7.8130E-03 | 3.3192E-04 | 1.4159E-05 | -3.1150E-06 | -8.4308E-08 | -5.1591E-09 |
| S8 | 23.2794 | -8.4908E-05 | 5.5277E-05 | -9.4002E-06 | 8.9923E-07 | -9.9064E-09 | -5.9767E-09 |
| S9 | 96.1771 | 2.6816E-04 | 5.2012E-05 | -1.0645E-06 | -1.8913E-07 | -3.0919E-08 | 5.9905E-09 |
| S13 | -0.5644 | -1.5642E-03 | 6.5637E-06 | -2.4673E-06 | -3.0164E-08 | -9.3978E-11 | -1.2741E-10 |
| S14 | -0.0829 | -1.7987E-03 | 7.2015E-05 | -1.0871E-05 | 2.9941E-07 | -7.7890E-10 | -2.7160E-10 |
TABLE 4 Table 4
Example 3
An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 shows a schematic structural view of an optical lens according to embodiment 3 of the present application.
As shown in fig. 3, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.
The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has a meniscus lens element with negative refractive power, a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 has a meniscus lens element with negative refractive power, and has a convex object-side surface S8 and a concave image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a negative refractive power, a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a meniscus lens with positive optical power, and has a convex object-side surface S13 and a concave image-side surface S14. The fifth lens L5 and the sixth lens L6 may be cemented to constitute cemented lenses.
The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed near the object side surface S6 of the third lens L3.
In the present embodiment, the object side surface and the image side surface of each of the first lens L1, the fourth lens L4, and the seventh lens L7 may be aspherical.
Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side surface S15 and an image side surface S16, the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensing chip IMA located at the imaging surface S17. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 5 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3.
TABLE 5
The cone coefficients K and the higher order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 3 are given in table 6 below.
| Face number | K | A | B | C | D | E | F |
| S1 | -1.1808 | -6.9706E-03 | 4.3652E-04 | -1.6320E-05 | 3.4132E-07 | -3.1525E-09 | 3.0514E-12 |
| S2 | -0.6520 | -1.2910E-02 | 5.1764E-04 | -3.7246E-06 | -2.5544E-06 | 2.7265E-09 | 2.4055E-09 |
| S8 | -99.0000 | -1.6697E-03 | 1.2784E-04 | -1.8930E-05 | 8.4212E-07 | -3.7826E-09 | -5.1172E-10 |
| S9 | 2.2552 | -1.7364E-03 | 1.7735E-04 | -1.6706E-05 | 3.6523E-07 | -7.0350E-09 | 1.4336E-10 |
| S13 | -1.2000 | -1.7521E-03 | -7.6970E-06 | -3.0484E-06 | -1.7010E-07 | 1.6820E-09 | -1.4363E-10 |
| S14 | 0.2328 | -1.9796E-03 | 1.3886E-05 | -8.1978E-06 | 1.2570E-07 | 1.8044E-09 | -2.5365E-11 |
TABLE 6
Example 4
An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural view of an optical lens according to embodiment 4 of the present application.
As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.
The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has a meniscus lens element with negative refractive power, a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 has a meniscus lens element with negative refractive power, a concave object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a negative refractive power, a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a meniscus lens with positive optical power, and the object side surface S13 is a convex surface and the image side surface S14 is a convex surface. The fifth lens L5 and the sixth lens L6 may be cemented to constitute cemented lenses.
The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed near the image side surface S4 of the second lens L2.
In the present embodiment, the object side surface and the image side surface of each of the first lens L1, the fourth lens L4, and the seventh lens L7 may be aspherical.
Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side surface S15 and an image side surface S16, the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensing chip IMA located at the imaging surface S17. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 7 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4.
TABLE 7
The cone coefficients K and the higher order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 4 are given in table 8 below.
| Face number | K | A | B | C | D | E | F |
| S1 | -2.6214 | -5.5540E-03 | 3.9917E-04 | -1.7378E-05 | 4.1560E-07 | -4.0953E-09 | -3.4134E-12 |
| S2 | -0.8024 | -7.1093E-03 | 8.3126E-04 | -3.2994E-05 | 2.8793E-06 | 2.7265E-09 | 2.4055E-09 |
| S8 | -12.6548 | 2.1566E-04 | 3.7986E-05 | -1.7930E-06 | -2.7719E-08 | -3.7826E-09 | -5.1172E-10 |
| S9 | -44.2437 | 5.0957E-04 | 3.7498E-05 | 4.6175E-06 | -4.1967E-07 | -7.0350E-09 | 1.4336E-10 |
| S13 | -64.7528 | -3.0964E-03 | 2.9983E-05 | 1.8027E-06 | -1.4749E-07 | 1.6820E-09 | -1.4363E-10 |
| S14 | 99.0000 | -2.7820E-03 | 9.1285E-05 | -7.6613E-07 | -6.0145E-08 | 1.8044E-09 | -2.5365E-11 |
TABLE 8
Example 5
An optical lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 shows a schematic structural view of an optical lens according to embodiment 5 of the present application.
As shown in fig. 5, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.
The first lens element L1 has a meniscus lens element with negative refractive power, a convex object-side surface S1 and a concave image-side surface S2. The second lens element L2 has a meniscus lens element with negative refractive power, a concave object-side surface S3 and a convex image-side surface S4. The third lens element L3 has a convex object-side surface S6 and a convex image-side surface S7. The fourth lens element L4 has a meniscus lens element with negative refractive power, a concave object-side surface S8 and a convex image-side surface S9. The fifth lens element L5 has a convex object-side surface S10 and a convex image-side surface S11, respectively, and has positive optical power. The sixth lens element L6 has a negative refractive power, a concave object-side surface S11 and a convex image-side surface S12. The seventh lens L7 is a meniscus lens with positive optical power, the object side surface S13 is a concave surface, and the image side surface S14 is a convex surface. The fifth lens L5 and the sixth lens L6 may be cemented to constitute cemented lenses.
The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4 to improve imaging quality. For example, the stop STO may be disposed near the object side surface S4 of the second lens L2.
In the present embodiment, the object side surface and the image side surface of each of the first lens L1, the fourth lens L4, and the seventh lens L7 may be aspherical.
Optionally, the optical lens may further include a filter L8 and/or a protective glass L8 'having an object side surface S15 and an image side surface S16, the filter L8 may be used to correct color deviation and the protective glass L8' may be used to protect the image sensing chip IMA located at the imaging surface S17. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 9 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 5.
TABLE 9
The cone coefficients K and the higher order coefficients A, B, C, D, E and F that can be used for the aspherical lens surfaces S1, S2, S8, S9, S13 and S14 in example 5 are given in table 10 below.
| Face number | K | A | B | C | D | E | F |
| S1 | -2.46E+00 | -5.48E-03 | 4.03E-04 | -1.74E-05 | 4.04E-07 | -3.80E-09 | -3.41E-12 |
| S2 | -7.24E-01 | -8.25E-03 | 7.63E-04 | -2.30E-05 | 2.53E-06 | 2.73E-09 | 2.41E-09 |
| S8 | -1.39E+01 | 2.23E-04 | 3.19E-05 | -3.41E-06 | 3.96E-08 | -3.78E-09 | -5.12E-10 |
| S9 | -9.90E+01 | 5.84E-04 | 3.20E-05 | 3.49E-06 | -4.07E-07 | -7.04E-09 | 1.43E-10 |
| S13 | 9.90E+01 | -3.88E-03 | 2.82E-05 | 5.33E-06 | -3.20E-07 | 1.68E-09 | -1.44E-10 |
| S14 | 1.67E+00 | -2.79E-03 | 1.07E-04 | -2.00E-07 | -9.68E-08 | 1.80E-09 | -2.54E-11 |
Table 10
In summary, examples 1 to 5 each satisfy the relationships shown in table 11 below. In Table 13, F1, F2, F3, F4, F5, F6, F7, F56, TTL, H, F, D, R, R2, R3, R4, R13, R14 are in millimeters (mm), and FOV is in degrees (degree)
TABLE 11
Examples 1 to 5 each satisfy the relationship shown in table 12 below. In Table 12, d1, d2, d3, d4, d5, d6, d7, dn (max), dm (min) are expressed in millimeters (mm).
D1 to d7 correspond to the center thickness of each of the first lens to the seventh lens on the optical axis, respectively, dn (max) is the maximum center thickness value among the center thicknesses of each of the first lens to the seventh lens on the optical axis, dm (min) is the minimum center thickness value among the center thicknesses of each of the first lens to the seventh lens on the optical axis, and max { dn: dm } is the maximum value of the ratio of the center thicknesses of any two of the first lens to the seventh lens on the optical axis, that is, p as described above.
| Conditional\embodiment | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| d1 | 0.9050 | 1.2000 | 1.2000 | 1.2000 | 1.2000 |
| d2 | 4.7000 | 4.9799 | 3.6344 | 4.7119 | 4.6584 |
| d3 | 2.4580 | 2.1651 | 1.9765 | 2.6249 | 2.6335 |
| d4 | 1.5073 | 0.7000 | 1.0000 | 0.8000 | 0.8284 |
| d5 | 3.2296 | 4.0140 | 3.2696 | 3.0632 | 2.9000 |
| d6 | 2.3354 | 0.8487 | 1.0000 | 1.2371 | 0.8000 |
| d7 | 2.4592 | 2.2035 | 1.4554 | 2.3861 | 2.3959 |
| dn(max) | 4.7000 | 4.9799 | 3.6344 | 4.7119 | 4.6584 |
| dm(min) | 0.9050 | 0.7000 | 1.0000 | 0.8000 | 0.8000 |
| max{dn:dm} | 5.1936 | 7.1141 | 3.6344 | 5.8899 | 5.8230 |
Table 12
The present application also provides an electronic device, which may include the optical lens according to the above-described embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a stand-alone electronic device such as a detection range camera or may be an imaging module integrated with such a detection range device. The electronic device may also be a stand-alone imaging device, such as an onboard camera, or an imaging module integrated on, for example, a driving assistance system.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.