Detailed Description
For a better understanding of the invention, various aspects of the invention will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of embodiments of the invention and are not intended to limit the scope of the invention 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 invention.
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 object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane 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 invention, use of "may" means "one or more embodiments of the invention. 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 invention 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 invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The invention provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, and the optical centers of the lenses are positioned on the same straight line.
In some embodiments, the first lens is configured to have negative focal power, so that the light is favorable to diverging, and under the same angle of view, the light exiting through the image side surface of the first lens can make a subsequent optical system have a larger light receiving surface, so that the front end diameter is reduced, the object side surface is concave, and the image side surface is concave, so that the effective working caliber of the first lens can be reduced, and meanwhile, the problem that the caliber of a lens behind the optical lens is overlarge due to excessive divergence of the light is avoided.
In some embodiments, the second lens is provided with positive focal power, is favorable for converging light rays, is matched with the first lens with negative focal power, can reduce the total length of the optical lens, can further reduce the rear end diameter due to the converging action of the light rays, is convex on the object side, can converge the light rays passing through the first lens, reduces the height of the light rays, reduces the caliber of the optical lens, simultaneously slows down the turning trend of the light rays to make the transition smooth, can balance various aberrations generated by the front lens, and improves the overall imaging quality of the optical lens.
In some embodiments, the third lens element has positive power, so as to be beneficial to receiving the light rays collected by the second lens element, reduce the height of the light rays when the light rays are incident on the object side surface of the fourth lens element, reduce the caliber of the object side surface of the fourth lens element, and the object side surface is convex, so that the light rays emitted by the second lens element can be smoothly received, and the light rays can smoothly enter the rear optical system, thereby reducing the generation of aberration and improving the imaging quality. The light rays with the edge view field can deflect towards the optical axis direction after passing through the second side surface of the third lens, and the rear end port diameter of the system is reduced.
In some embodiments, the fourth lens element has positive focal power, which is beneficial to converging light rays, and is matched with the fifth lens element, so that the aberration of the optical lens element can be effectively corrected, the imaging quality can be improved, and the optical performance such as distortion and the like can be optimized.
In some embodiments, the fifth lens is provided with negative focal power, which is favorable for diverging light, so that a subsequent optical system has a larger light receiving surface, various aberrations brought by the front lens can be effectively corrected by improving optical performance, imaging quality of the optical lens is improved, the image side surface is a concave surface, light passing through a central view field and an edge view field of the fifth lens can be adjusted, particularly, the angle of incidence of the light of the edge view field on the imaging surface is adjusted to enable the principal light to be emitted to the imaging surface in parallel, and therefore the proportion of the edge view field in an imaging picture can be improved, the imaging definition of the edge view field can be enhanced, various aberrations brought by the front lens can be corrected, and the overall imaging quality of the optical lens is improved.
In some embodiments, the sixth lens is configured to have positive focal power, which is favorable for receiving front-end light rays, improving resolution, and further, the fifth lens receives light rays compressed by the front-end positive lens, reduces the angle of the light rays, meets the requirements of CRA, and can optimize spherical aberration and improve imaging quality.
In some embodiments, a stop may be disposed between the first lens and the second lens, it being understood that the stop may be used to limit the amount of light entering to vary the brightness of the image. In addition, when the diaphragm is located between the first lens and the second lens, the diaphragm can reasonably distribute the actions of the first lens to the sixth lens, for example, the first lens can be used for receiving light rays to a greater extent, and the second lens to the sixth lens can be used for correcting the action of aberration, which is beneficial to balancing the structure of the whole optical system. Further, when the aperture stop is located between the first lens and the second lens, correction of the aperture stop aberration and balancing of the structure and focal length distribution of the front lens group and the rear lens group are facilitated.
In some embodiments, the optical lens may further include a filter disposed between the sixth lens element and the imaging surface, for filtering the interference light, so as to prevent the interference light from reaching the imaging surface of the optical lens element to affect normal imaging.
In some embodiments, the effective focal length f of the optical lens satisfies 12mm < f <17mm. The range is satisfied, the long-focus characteristic of the optical lens is facilitated, the shooting and distant effect of the optical lens can be guaranteed, the system has larger magnification, and the imaging quality of sceneries in a far-view range is better.
In some embodiments, the maximum field angle of the optical lens satisfies 30 ° < FOV <40 °. The range is satisfied, so that the optical lens has a proper angle of view, and a long-distance target can be clearly shot.
In some embodiments, the aperture value FNO of the optical lens satisfies 1.4< FNO <1.8. The range is satisfied, the large aperture characteristic is realized, and the definition of the image can be ensured in a low-light environment or at night.
In some embodiments, the angle of incidence CRA of the maximum field angle chief ray of the optical lens on the image plane satisfies 14 ° < CRA <21 °. The above range is satisfied, so that a larger tolerance error range exists between the CRA of the optical lens and the CRA of the chip photosensitive element, and the adaptation capability of the optical lens to the image sensor is improved.
In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 1.5< TTL/f <2.5. The range is satisfied, the total length can be effectively compressed, enough space is ensured to adjust the lens structure, and the imaging effect of the optical lens is optimized.
In some embodiments, the image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens satisfy 0.95< (IH/2)/(f×Tan (FOV/2)) <1.1. The above range is satisfied, the distortion of the optical lens can be well controlled, the characteristics of small distortion are provided, and the resolution of the optical lens can be improved.
In some embodiments, the image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy 0.6< IH/f <0.75. The range is satisfied, and the chip matched with the large image surface can be ensured, so that the optical lens has the characteristics of long focus and the large image surface.
In some embodiments, the optical back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy 0.2< BFL/f <0.4. The optical lens has the advantages that the optical lens meets the range, the good imaging quality and the optical back focal length easy to assemble can be balanced, the imaging quality of the optical lens is guaranteed, the interference between the lens and other elements is avoided, the assembling process difficulty of the camera module is reduced, and the production yield is improved.
In some embodiments, the total optical length TTL of the optical lens, the image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy 45<180 degrees x TTL/(IH/2)/(FOV/2) <80. Satisfying the above range, the length of the optical lens can be limited under the same imaging area and the same angle of view, and miniaturization of the optical lens can be realized.
In some embodiments, the sum of the total optical length TTL of the optical lens and the center thicknesses of the first lens to the sixth lens along the optical axis respectively, ΣCT, satisfies 0.5< ΣCT/TTL <0.8. The total length of the optical lens can be compressed by meeting the range, so that the structure of the optical lens is more compact.
In some embodiments, the light passing half aperture d1 of the first lens object side surface, the image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy 2.9< d 1/(IH/2)/Tan (FOV/2) <4.3. The front end diameter can be made small under the condition that the optical lens has proper angle of view and image height, which is beneficial to miniaturization of the optical lens.
In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy f1/f < -0.7. The optical lens meets the above range, can enable a large range of light to enter the optical lens, obtains more picture information, is beneficial to controlling lens distortion and reducing field curvature, and improves the geometric accuracy of an imaging surface. Preferably, -2.5< f1/f < -0.7.
In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy 0.7< f2/f <2. The range is satisfied, the light deflection angle can be reduced while converging light, so that the light trend is stably transited, various aberrations generated by the front lens can be balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy 1< f3/f. The optical lens meets the above range, can reduce the deflection angle of light so as to make the light trend stably transition, and can balance various aberrations generated by the front lens at the same time, thereby improving the imaging quality of the optical lens. Preferably 1< f3/f <2.6.
In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy 0.7< f4/f <1.2. The range is satisfied, the light rays emitted from the fourth lens can be converged and adjusted to slow down the turning trend and convergence degree of the light rays, so that the light rays are smoothly transited, various aberrations generated by the front lens can be balanced, and the overall imaging quality of the optical lens is improved.
In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy-0.8 < f5/f < -0.2. The range is met, the imaging area can be increased, and the chromatic aberration of the lens can be optimized by matching the fourth lens with the fifth lens, so that the imaging quality is improved.
In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy 1.7< f6/f. The spherical aberration can be optimized, the imaging quality is improved, the angle of the edge view field incident on the imaging surface is pressed, more light beams are effectively transmitted to the imaging surface, and the imaging quality is improved. Preferably 1.7< f6/f <6.9.
In some embodiments, the radius of curvature R3 of the object side of the second lens and the effective focal length f of the optical lens satisfy 0.5< R3/f <1. The range is met, the convex surface faces to the object side, the marginal view field light rays are converged, and the marginal view field imaging quality is improved.
In some embodiments, the radius of curvature R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy 0.6< R5/f. The range is met, the convex surface faces to the object side, the marginal view field light rays are converged, and the marginal view field imaging quality is improved. Preferably 0.6< R5/f <7.
In some embodiments, the radius of curvature R10 of the image side of the fifth lens and the effective focal length f of the optical lens satisfy 0.2< R10/f <0.7. The range is satisfied, the concave surface faces to the image side, the marginal view angle rays are converged, and the relative illuminance of the optical lens is improved.
In some embodiments, the radius of curvature R1 of the object-side surface and the radius of curvature R2 of the image-side surface of the first lens satisfy 1.2< | (R1-R2)/(R1+R2) |. The range is met, smooth transition of light to the rear is facilitated, more light is collected and enters the lens, and the resolution capability is improved while the small caliber and the short total length are realized. Preferably, 1.2< | (R1-R2)/(R1+R2) | <17.3.
In some embodiments, the radius of curvature R7 of the object-side surface and the radius of curvature R8 of the image-side surface of the fourth lens element satisfy-0.95 < (R5-R6)/(R5+R6) < -0.6. Satisfying the above range, helps to control the fringe field beam profile to increase the image height, while reducing off-axis aberrations of the optical lens, and helps to reduce field curvature.
In some embodiments, the radius of curvature R1 of the object side of the first lens and the effective focal length f of the optical lens satisfy-1.8 < R1/f < -0.9. The light beam receiving surface is arranged on the object side of the first lens, and the concave surface faces to the object side to play a role in dispersing light rays.
In some embodiments, the radius of curvature R2 of the image side of the first lens and the effective focal length f of the optical lens satisfy 0.9< R2/f. The lens meets the above range, the concave surface can face the image side, the light rays have a divergent effect, the imaging area of the lens is increased, and the imaging quality is improved. Preferably 0.9< R2/f <11.1.
In some embodiments, the radius of curvature R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy 0.4< R7/f <0.65. The range is met, the convex surface faces to the object side, light rays emitted by the third lens can smoothly enter the fourth lens, more light rays are collected, the detail quality of an imaging surface is improved, the generation of aberration is reduced, and the imaging quality is improved.
In some embodiments, the radius of curvature R8 of the image side of the fourth lens and the effective focal length f of the optical lens satisfy 3< R8/f. The concave surface can face to the image side, so that the marginal view field light rays are deflected towards the optical axis direction after passing through the second side surface of the fourth lens, and the rear end port diameter of the system is reduced. Preferably 3< R8/f <8.3.
As an embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens may be all glass lenses or glass-plastic mixed lenses, and both may obtain good imaging effect. In the present application, in order to improve the imaging quality of the lens, each lens is a glass lens. At least one of the object side surface or the image side surface of the second lens and the sixth lens is an aspheric surface. The aspherical lens is characterized in that the curvature is continuously changed from the center of the lens to the periphery of the lens, and the aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatic aberration, unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens.
For better optical performance of the system, a plurality of aspheric lenses are adopted in the lens, and the shape of each aspheric surface of the optical lens meets the following equation:
wherein z is the distance between the curved surface and the curved surface vertex in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the curved surface vertex, K is the quadric surface coefficient, A, B, C, D, E, F is the second, fourth, sixth, eighth, tenth and twelfth order surface coefficients respectively.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structure of an optical lens provided in embodiment 1 of the present invention is shown, and the optical lens includes, in order from an object side to an imaging surface S14 along an optical axis, a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
The lens assembly includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element S13 and an image plane S14, wherein the first lens element L1 is a spherical lens element with negative focal power, the object side surface S1 of the first lens element is a concave surface, the image side surface S2 of the first lens element is a concave surface, the object side surface S2 of the second lens element is an aspherical lens element with positive focal power, the object side surface S3 of the second lens element is a convex surface, the image side surface S4 of the third lens element is a spherical lens element with positive focal power, the object side surface S5 of the third lens element is a convex surface, the image side surface S6 of the third lens element is a concave surface, the fourth lens element L4 is a spherical lens element with positive focal power, the object side surface S7 of the fourth lens element is a convex surface, the image side surface S8 of the fourth lens element is a concave surface, the fifth lens element L5 is a spherical lens element with negative focal power, the object side surface S9 of the fifth lens element is a concave surface, the image side surface S10 of the sixth lens element L6 is an aspherical lens element with positive focal power, the object side surface S11 of the sixth lens element is a convex surface, and the image side surface S12 of the sixth lens element is a convex surface, and the object side surface S13 and the image side surface S14 of the image plane.
Specifically, the design parameters of each lens of the optical lens provided in this embodiment are shown in table 1-1.
TABLE 1-1
The surface profile coefficients of the aspherical surfaces of the optical lens in this example are shown in tables 1 to 2.
TABLE 1-2
Fig. 2 shows a field curve of example 1, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.1mm, which indicates that the optical lens can well correct the field curvature.
Fig. 3 shows a distortion graph of example 1, which shows F-Tan (Theta) distortion at different view angles on an imaging plane, with the horizontal axis representing distortion values (in:%) and the vertical axis representing half view angles (in: °). From the graph, the distortion value is controlled within the range of 0-2%, which indicates that the optical lens has smaller distortion, the image compression in the edge angle area is more gentle, and the definition of the unfolded image is effectively improved.
Fig. 4 shows a Modulation Transfer Function (MTF) graph of example 1, which represents a lens imaging modulation degree representing different spatial frequencies at each view field, the horizontal axis represents spatial frequency (unit: lp/mm), and the vertical axis represents MTF value. As can be seen from the graph, the MTF value of the embodiment is above 0.25 in the whole view field, and in the range of 0-120 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of viewing from the center to the edge, and the MTF value has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Example 2
Referring to fig. 5, a schematic structural diagram of an optical lens according to embodiment 2 of the present invention is shown, and the optical lens according to the present invention is substantially the same as that of the above-mentioned embodiment 1, except that parameters such as a radius of curvature of each lens face, a thickness of each lens, and an aspherical coefficient of each lens are different.
Specifically, the design parameters of each lens of the optical lens provided in this embodiment are shown in table 2-1.
TABLE 2-1
The surface profile coefficients of the aspherical surfaces of the optical lens in this example are shown in tables 2 to 2.
TABLE 2-2
| Face number | K | A | B | C |
| S3 | 6.01E-01 | 0.00E+00 | -3.56E-04 | -4.45E-06 |
| S4 | 2.59E+00 | 0.00E+00 | 7.42E-05 | 1.00E-06 |
| S11 | -1.32E+38 | 0.00E+00 | -7.53E-04 | -8.27E-05 |
| S12 | 1.44E+01 | 0.00E+00 | -1.53E-04 | -1.26E-04 |
| Face number | D | E | F | |
| S3 | -8.87E-08 | 2.26E-09 | -1.77E-10 | |
| S4 | -3.21E-07 | 1.46E-08 | -3.61E-10 | |
| S11 | -3.49E-06 | 5.44E-07 | -4.15E-08 | |
| S12 | 7.57E-06 | -4.46E-07 | 8.06E-09 | |
Fig. 6 to 8 show a field curve graph, a distortion graph, and a Modulation Transfer Function (MTF) graph of example 2, respectively. From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.1mm, which shows that the optical lens can well correct the field curvature, the distortion value is controlled within 0 to 8%, which shows that the optical lens has smaller distortion, the MTF value of the optical lens is above 0.2 in the whole view field, the MTF curve is evenly and smoothly reduced in the process of the view field from the center to the edge within the range of 0 to 120lp/mm, and the optical lens has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Example 3
Referring to fig. 9, a schematic structural diagram of an optical lens according to embodiment 3 of the present invention is shown, and the optical lens according to the present invention is substantially the same as that of the above-mentioned embodiment 1, except that parameters such as a radius of curvature of each lens face, a thickness of each lens, and an aspherical coefficient of each lens are different.
Specifically, the design parameters of each lens of the optical lens provided in this embodiment are shown in table 3-1.
TABLE 3-1
The surface profile coefficients of the aspherical surfaces of the optical lens in this example are shown in table 3-2.
TABLE 3-2
| Face number | K | A | B | C |
| S3 | 7.43E-01 | 0.00E+00 | -2.25E-04 | 8.81E-06 |
| S4 | 4.14E+01 | 0.00E+00 | 2.68E-04 | -1.62E-06 |
| S11 | 4.09E+02 | 0.00E+00 | 9.60E-05 | -8.83E-05 |
| S12 | 2.63E+01 | 0.00E+00 | 5.41E-04 | -1.01E-04 |
| Face number | D | E | F | |
| S3 | -6.83E-07 | 2.20E-08 | -2.82E-10 | |
| S4 | 1.62E-07 | -4.47E-09 | 5.87E-11 | |
| S11 | 4.86E-06 | -3.36E-07 | 1.95E-09 | |
| S12 | 6.58E-06 | -4.37E-07 | 9.09E-09 | |
Fig. 10 to 12 show a field curve graph, a distortion graph, and a Modulation Transfer Function (MTF) graph of example 3, respectively. From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.1 mm to 0.1mm, which shows that the optical lens can well correct the field curvature, the distortion value is controlled within 0 to 4%, which shows that the optical lens has smaller distortion, the MTF value of the optical lens is above 0.3 in the whole view field, the MTF curve is evenly and smoothly reduced in the process of the view field from the center to the edge within the range of 0 to 120lp/mm, and the optical lens has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Example 4
Referring to fig. 13, a schematic structural diagram of an optical lens according to embodiment 4 of the present invention is shown, and the optical lens according to the present invention is substantially the same as the optical lens according to the above embodiment 1, except that the fourth lens has negative focal power, and parameters such as a radius of curvature of each lens surface, a thickness of each lens, and an aspheric coefficient of each lens are different.
Specifically, the design parameters of each lens of the optical lens provided in this embodiment are shown in table 4-1.
TABLE 4-1
The surface profile coefficients of the aspherical surfaces of the optical lens in this example are shown in table 4-2.
TABLE 4-2
| Face number | K | A | B | C |
| S3 | -6.96E-01 | 0.00E+00 | 0.00E+00 | -4.63E-07 |
| S4 | 5.00E+01 | 0.00E+00 | 0.00E+00 | -2.68E-06 |
| S11 | -6.13E+00 | 0.00E+00 | -5.92E-05 | -2.44E-05 |
| S12 | -4.00E+00 | 0.00E+00 | -2.31E-04 | 1.85E-05 |
| Face number | D | E | F | |
| S3 | -8.76E-08 | 2.78E-09 | -5.18E-11 | |
| S4 | 8.03E-09 | -2.54E-10 | -1.54E-11 | |
| S11 | -8.02E-07 | 1.12E-08 | 5.45E-10 | |
| S12 | -4.67E-06 | 2.19E-07 | -3.16E-09 | |
Fig. 14 to 16 show a field curve graph, a distortion graph, and a Modulation Transfer Function (MTF) graph of example 4, respectively. From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.05mm, which shows that the optical lens can well correct the field curvature, the distortion value is controlled within-0.8% -0, which shows that the optical lens has smaller distortion, the MTF value of the optical lens is more than 0.2 in the whole view field, the MTF curve is evenly and smoothly reduced in the process of the view field from the center to the edge in the range of 0-120 lp/mm, and the optical lens has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Example 5
Referring to fig. 17, a schematic diagram of an optical lens according to embodiment 5 of the present invention is shown, and the optical lens according to the present invention is substantially the same as the optical lens according to the above embodiment 1, and is different in parameters such as a radius of curvature of each lens face, a thickness of each lens, and an aspherical coefficient of each lens.
Specifically, the design parameters of each lens of the optical lens provided in this embodiment are shown in table 5-1.
TABLE 5-1
The surface profile coefficients of the aspherical surfaces of the optical lens in this example are shown in table 5-2.
TABLE 5-2
| Face number | K | A | B | C |
| S3 | -8.87E-01 | 0.00E+00 | 0.00E+00 | -6.29E-07 |
| S4 | 5.00E+01 | 0.00E+00 | 0.00E+00 | -2.75E-06 |
| S11 | -6.74E+00 | 0.00E+00 | 2.12E-05 | -2.42E-05 |
| S12 | -3.99E+00 | 0.00E+00 | -2.66E-04 | 1.70E-05 |
| Face number | D | E | F | |
| S3 | -9.43E-08 | 2.60E-09 | -5.06E-11 | |
| S4 | -1.66E-09 | -2.58E-10 | -1.56E-11 | |
| S11 | -1.05E-06 | 3.70E-09 | 9.18E-10 | |
| S12 | -4.76E-06 | 2.16E-07 | -2.91E-09 | |
Fig. 17 to 20 show a field curve graph, a distortion graph, and a Modulation Transfer Function (MTF) graph of example 5, respectively. From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.05mm, which shows that the optical lens can well correct the field curvature, the distortion value is controlled within-1% -0, which shows that the optical lens has smaller distortion, the MTF value of the optical lens is above 0.2 in the whole view field, the MTF curve is evenly and smoothly reduced in the process of the view field from the center to the edge in the range of 0-120 lp/mm, and the optical lens has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Example 6
Referring to fig. 21, a schematic structural diagram of an optical lens according to embodiment 6 of the present invention is shown, and the optical lens according to the present invention is substantially the same as that of the above-mentioned embodiment 1, except that parameters such as a radius of curvature of each lens face, a thickness of each lens, and an aspherical coefficient of each lens are different.
Specifically, the design parameters of each lens of the optical lens provided in this embodiment are shown in table 6-1.
TABLE 6-1
The surface profile coefficients of the aspherical surfaces of the optical lens in this example are shown in table 6-2.
TABLE 6-2
| Face number | K | A | B | C |
| S3 | -8.27E-01 | 0.00E+00 | 0.00E+00 | -4.79E-07 |
| S4 | 5.00E+01 | 0.00E+00 | 0.00E+00 | -2.62E-06 |
| S11 | -7.73E+00 | 0.00E+00 | -1.56E-04 | -2.59E-05 |
| S12 | -4.90E+00 | 0.00E+00 | -3.54E-04 | 1.96E-05 |
| Face number | D | E | F | |
| S3 | -8.88E-08 | 2.74E-09 | -5.05E-11 | |
| S4 | 8.55E-09 | -2.32E-10 | -1.65E-11 | |
| S11 | -7.09E-07 | 1.58E-08 | 3.26E-10 | |
| S12 | -4.54E-06 | 2.15E-07 | -3.24E-09 | |
Fig. 22 to 24 show a field curve graph, a distortion graph, and a Modulation Transfer Function (MTF) graph of example 6, respectively. From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.05mm, which shows that the optical lens can well correct the field curvature, the distortion value is controlled within-0.8% -0, which shows that the optical lens has smaller distortion, the MTF value of the optical lens is more than 0.2 in the whole view field, the MTF curve is evenly and smoothly reduced in the process of the view field from the center to the edge in the range of 0-120 lp/mm, and the optical lens has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Example 7
Referring to fig. 25, a schematic structural diagram of an optical lens according to embodiment 7 of the present invention is shown, and the optical lens according to the present invention is substantially the same as the optical lens according to the above embodiment 1, and is different in parameters such as radius of curvature of each lens face, thickness of each lens, and aspherical coefficient of each lens.
Specifically, the design parameters of each lens of the optical lens provided in this embodiment are shown in table 7-1.
TABLE 7-1
The surface profile coefficients of the aspherical surfaces of the optical lens in this example are shown in table 7-2.
TABLE 7-2
Fig. 26 to 28 show a field curve graph, a distortion graph, and a Modulation Transfer Function (MTF) graph of example 7, respectively. From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.1 mm-0.05 mm, which shows that the optical lens can well correct the field curvature, the distortion value is controlled within 0-6%, which shows that the optical lens has smaller distortion, the MTF value of the optical lens is above 0.2 in the whole view field, the MTF curve is evenly and smoothly reduced in the process of the view field from the center to the edge within the range of 0-120 lp/mm, and the optical lens has good imaging quality and good detail resolution capability under the conditions of low frequency and high frequency.
Referring to table 8, the optical characteristics of the optical lenses provided in the above 7 embodiments are shown, and include the effective focal length f, the maximum field angle FOV, the pupil diameter EPD, the total optical length TTL, the aperture value FNO, the image height IH corresponding to the maximum field angle, the chief ray incident angle CRA, the optical back focus BFL, and the numerical values corresponding to each conditional expression in each embodiment.
TABLE 8
Continuing to table 8
| Parameters and conditions | Example 5 | Example 6 | Example 7 |
| f(mm) | 15.06 | 15.08 | 14.49 |
| FOV(°) | 35.00 | 35.00 | 35.00 |
| EPD(mm) | 9.41 | 9.43 | 9.06 |
| TTL(mm) | 31.78 | 32.36 | 32.99 |
| FNO | 1.60 | 1.60 | 1.60 |
| IH(mm) | 9.43 | 9.43 | 9.65 |
| CRA(°) | 19.04 | 19.01 | 18.96 |
| BFL(mm) | 2.32 | 2.32 | 2.25 |
| TTL/f | 2.11 | 2.15 | 2.28 |
| (IH/2)/(f×Tan(FOV/2)) | 0.99 | 0.99 | 1.06 |
| IH/f | 0.63 | 0.63 | 0.67 |
| BFL/f | 0.29 | 0.27 | 0.28 |
| 180°×TTL/(IH/2)/(FOV/2) | 69.33 | 70.56 | 70.35 |
| ΣCT/TTL | 0.61 | 0.61 | 0.71 |
| d1/(IH/2)/Tan(FOV/2) | 3.97 | 3.91 | 4.08 |
| f1/f | -2.19 | -2.10 | -2.08 |
| f2/f | 1.66 | 1.68 | 1.83 |
| f3/f | 1.95 | 1.60 | 1.22 |
| f4/f | 1.05 | 1.05 | 1.04 |
| f5/f | -0.66 | -0.58 | -0.44 |
| f6/f | 3.41 | 4.43 | 1.98 |
| R3/f | 0.85 | 0.83 | 0.85 |
| R5/f | 0.79 | 0.85 | 1.47 |
| R10/f | 0.46 | 0.49 | 0.42 |
| (R1-R2)/(R1+R2) | -1.47 | -1.36 | -1.37 |
| (R7-R8)/(R7+R8) | -0.72 | -0.83 | -0.85 |
| R1/f | -1.65 | -1.53 | -1.52 |
| R2/f | 8.64 | 10.06 | 9.79 |
| R7/f | 0.54 | 0.57 | 0.57 |
| R8/f | 3.34 | 6.17 | 6.90 |
In summary, in the optical lens in the embodiment of the invention, six lenses with optical power are adopted, and through reasonably distributing the optical power of each lens, reasonably matching the surface shape of each lens, reasonably setting the thickness of each lens and the distance between each lens, reasonably setting the position of the aperture, and setting the optical lens to have smaller distortion, the balancing of long focus (f maximum value is 15.08 mm), large aperture (FNO minimum value is 1.60) and high pixel can be realized, so that the use requirement of the vehicle-mounted lens can be met.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.