CN117192733A - Fixed focus lens - Google Patents
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- CN117192733A CN117192733A CN202311033723.7A CN202311033723A CN117192733A CN 117192733 A CN117192733 A CN 117192733A CN 202311033723 A CN202311033723 A CN 202311033723A CN 117192733 A CN117192733 A CN 117192733A
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- 230000004075 alteration Effects 0.000 abstract description 46
- 238000003384 imaging method Methods 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 14
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 25
- 239000000463 material Substances 0.000 description 15
- 238000013461 design Methods 0.000 description 11
- 210000001747 pupil Anatomy 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000005499 meniscus Effects 0.000 description 5
- 238000010606 normalization Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000001228 spectrum Methods 0.000 description 1
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Abstract
The invention discloses a fixed focus lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object plane to an image plane along an optical axis; the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface is a convex surface; the eighth lens element has a convex object-side surface and a convex image-side surface. The fixed focus lens comprises eight lenses, and the surface shapes of the first lens, the second lens, the third lens and the eighth lens are reasonably arranged, so that the lens processing difficulty is reduced, the illuminance and the sensitivity of the lens are improved, the aberration of the lens is balanced, the imaging effect of the fixed focus lens is improved, and the characteristics that the wide angle low distortion can be considered, the maximum image surface can reach 16.1mm, and the 1' target surface sensor chip can be matched are realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of optical devices, in particular to a fixed-focus lens.
Background
As the market becomes more stringent with respect to parameters and performance of the lens. The wide-angle lens can provide a larger visual angle, the depth of field range is obviously larger than that of a standard lens, and the wide-angle lens is widely applied and monitored, photographed, vehicle-mounted and other industries.
However, as the angle of view increases, the distortion of the lens increases, and the distortion of the picture is serious. Therefore, reducing lens distortion becomes a difficult problem to overcome while maintaining a large field angle.
Disclosure of Invention
The invention provides a fixed focus lens, which realizes a large visual angle and a low distortion design scheme.
The embodiment of the invention provides a fixed focus lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens comprises a first object side surface close to one side of the object plane and a first image side surface close to one side of the image plane, the first object side surface is a convex surface, and the first image side surface is a concave surface;
the second lens comprises a second object side surface close to one side of the object plane and a second image side surface close to one side of the image plane, the second object side surface is a convex surface, and the second image side surface is a concave surface;
the third lens comprises a third object side surface close to one side of the object plane and a third image side surface close to one side of the image plane, the third object side surface is a concave surface, and the third image side surface is a convex surface;
the eighth lens element comprises an eighth object-side surface adjacent to the object plane and an eighth image-side surface adjacent to the image plane, wherein the eighth object-side surface is convex, and the eighth image-side surface is convex.
Optionally, the fourth lens includes a fourth object side surface near the object plane side and a fourth image side surface near the image plane side; the fourth object side surface is a concave surface, and the fourth image side surface is a convex surface;
the fifth lens comprises a fifth object side surface close to the object plane side and a fifth image side surface close to the image plane side; the fifth object side surface is a convex surface, and the fifth image side surface is a convex surface;
the sixth lens comprises a sixth object side surface close to the object plane side and a sixth image side surface close to the image plane side; the sixth object side surface is a concave surface, and the sixth image side surface is a concave surface;
the seventh lens comprises a seventh object side surface close to the object plane side and a seventh image side surface close to the image plane side; the seventh object-side surface is convex, and the seventh image-side surface is convex.
Optionally, the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass spherical lenses, and the third lens and the eighth lens are all plastic aspherical lenses.
Optionally, the sixth lens and the seventh lens are arranged to form a cemented lens.
Optionally, the first lens has negative optical power; the second lens has negative optical power; the third lens has negative focal power; the fourth lens has positive focal power; the fifth lens has positive focal power; the sixth lens and the seventh lens are arranged in a gluing way to form a gluing lens, and the gluing lens has negative focal power; the eighth lens has positive optical power.
Optionally, the focal power of the fixed focus lens isThe first lens power is +.>The second lens has optical power of +>The third lens has optical power of +>The fourth lens power is +.>The fifth lens focal power isThe optical power of the cemented lens is +.>The eighth lens power is +.>
Wherein:
optionally, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n2, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, the refractive index of the seventh lens is n7, and the refractive index of the eighth lens is n8;
wherein n1 is more than or equal to 1.72 and less than or equal to 1.87; n2 is more than or equal to 1.57 and less than or equal to 1.80; n3 is more than or equal to 1.49 and less than or equal to 1.74; n4 is more than or equal to 1.54 and less than or equal to 1.80; n5 is more than or equal to 1.49 and less than or equal to 1.67; n6 is more than or equal to 1.70 and less than or equal to 1.84; n7 is more than or equal to 1.56 and less than or equal to 1.86; n8 is more than or equal to 1.48 and less than or equal to 1.69.
Optionally, the image plane diameter of the fixed focus lens is IC, and the total length of the fixed focus lens is TTL;
wherein, the IC/TTL is more than or equal to 0.24.
Optionally, the field angle FOV of the fixed focus lens satisfies FOV > 140 °.
Optionally, the fixed focus lens further comprises a diaphragm and an optical filter;
the diaphragm is arranged in an optical path between the fifth lens and the sixth lens;
the optical filter is arranged in an optical path between the eighth lens and the image plane.
According to the fixed focus lens provided by the embodiment of the invention, the fixed focus lens comprises eight lenses, and the surface shapes of the first lens, the second lens, the third lens and the eighth lens are reasonably arranged, so that the lens processing difficulty is reduced, meanwhile, the illuminance and the sensitivity of the lens are improved, the aberration of the lens is balanced, the imaging effect of the fixed focus lens is improved, and the characteristics that the wide angle low distortion, the maximum image surface is larger than 16.1mm and the 1' target surface sensor chip can be matched are realized.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a fixed focus lens according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a spherical aberration curve of a fixed focus lens according to a first embodiment of the present invention;
fig. 3 is a schematic distortion diagram of a fixed focus lens according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fixed-focus lens according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of spherical aberration curves of a fixed focus lens according to a second embodiment of the present invention;
fig. 6 is a distortion schematic diagram of a fixed focus lens according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fixed focus lens according to a third embodiment of the present invention;
fig. 8 is a schematic diagram of a spherical aberration curve of a fixed focus lens according to a third embodiment of the present invention;
fig. 9 is a distortion schematic diagram of a fixed focus lens according to a third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of a fixed focus lens according to a first embodiment of the present invention, as shown in fig. 1, the fixed focus lens according to the first embodiment of the present invention includes a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a seventh lens element 170 and an eighth lens element 180, which are sequentially arranged along an optical axis from an object plane to an image plane, wherein the first lens element 110 includes a first object-side surface near one side of the object plane and a first image-side surface near one side of the image plane, the first object-side surface is a convex surface, and the first image-side surface is a concave surface; the second lens 120 includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface is a convex surface and the second image-side surface is a concave surface; the third lens element 130 comprises a third object-side surface adjacent to the object plane and a third image-side surface adjacent to the image plane, wherein the third object-side surface is concave and the third image-side surface is convex; the eighth lens element comprises an eighth object side surface close to the object plane and an eighth image side surface close to the image plane, wherein the eighth object side surface is convex, and the eighth image side surface is convex.
Specifically, the first object-side surface of the first lens element 110 is convex, the first image-side surface is concave, i.e., the object-side surface of the first lens element 110 is convex toward the object plane, and the image-side surface is concave toward the image plane, i.e., the first lens element 110 has a convex-concave structure. The second object-side surface of the second lens element 120 is convex, and the second image-side surface of the second lens element 120 is concave, i.e., the object-side surface of the second lens element 120 is convex toward the object plane, and the image-side surface of the second lens element 120 is concave toward the image plane, i.e., the second lens element 120 has a convex-concave structure. The third object-side surface of the third lens element 130 is concave, the third image-side surface is convex, i.e., the object-side surface of the third lens element 130 is concave toward the object plane, and the image-side surface of the third lens element 130 is convex toward the image plane, i.e., the third lens element 130 is a meniscus lens. The eighth object-side surface of the eighth lens element 180 is convex, and the eighth image-side surface of the eighth lens element 180 is convex, i.e., the object-side surface of the eighth lens element 180 protrudes toward the object plane, and the image-side surface of the eighth lens element 180 protrudes toward the image plane, i.e., the eighth lens element 180 has a biconvex structure.
Further, the first lens 110 may be a meniscus lens, which is beneficial to collect light, so as to ensure a larger field angle range of the fixed focus lens and realize a wide-angle characteristic shape. The second lens 120 may be a meniscus lens, which is similar to the first lens 110 in shape, and is also beneficial to collect light, so as to ensure a larger field angle range of the fixed focus lens and realize a wide-angle characteristic shape. And the second lens 120 can ensure that the incident angle of the light at the second lens 120 is small, thereby being beneficial to providing the illumination of the fixed focus lens, further reducing the light height and reducing the sensitivity of the lens. The third lens 130 may be a meniscus lens with its meniscus facing opposite to the first lens 110 and the second lens 120, and the third lens 130 may reduce the focal length of the rear lens to balance the aberration. The eighth lens 180 with the biconvex structure can collect light beams, reduce the angle of light entering the sensor, improve the luminous flux received by the sensor, and improve the sensing effect.
In summary, the fixed focus lens provided by the embodiment of the invention comprises eight lenses, and the surface of the first lens, the second lens, the third lens and the eighth lens are reasonably arranged, so that the lens processing difficulty is reduced, the illuminance and the sensitivity of the lens are improved, the aberration of the lens is balanced, the imaging effect of the fixed focus lens is improved, and the characteristics of being compatible with wide angle low distortion, enabling the maximum image surface to reach 16.1mm and being matched with a 1' target surface sensor chip are realized.
With continued reference to fig. 1, the fourth lens element 140 according to the above embodiment includes a fourth object-side surface adjacent to the object-plane and a fourth image-side surface adjacent to the image-plane, wherein the fourth object-side surface is concave and the fourth image-side surface is convex; the fifth lens element 150 comprises a fifth object-side surface near the object plane and a fifth image-side surface near the image plane, wherein the fifth object-side surface is convex and the fifth image-side surface is convex; the sixth lens 160 comprises a sixth object-side surface near the object plane and a sixth image-side surface near the image plane, wherein the sixth object-side surface is a concave surface; the seventh lens element 170 comprises a seventh object-side surface adjacent to the object plane and a seventh image-side surface adjacent to the image plane, wherein the seventh object-side surface is convex and the seventh image-side surface is convex.
Specifically, the fourth object-side surface of the fourth lens element 140 is concave, and the fourth image-side surface is convex, i.e., the object-side surface of the fourth lens element 140 is concave toward the object plane, and the image-side surface is convex toward the image plane, i.e., the fourth lens element 140 is a lens with a concave-convex structure. The fifth object-side surface of the fifth lens element 150 is convex, and the fifth image-side surface of the fifth lens element 150 is convex, i.e., the object-side surface of the fifth lens element 150 protrudes toward the object plane, and the image-side surface of the fifth lens element 120 protrudes toward the image plane, i.e., the fifth lens element 120 has a biconvex structure. The sixth object-side surface of the sixth lens element 160 is concave, and the sixth image-side surface is concave, i.e., the object-side surface of the sixth lens element 160 is concave toward the object plane, and the image-side surface is concave toward the image plane, i.e., the sixth lens element 160 is a biconcave lens. The seventh object-side surface of the seventh lens element 170 is convex, and the seventh image-side surface is convex, i.e., the object-side surface of the seventh lens element 170 protrudes toward the object plane, and the image-side surface protrudes toward the image plane, i.e., the seventh lens element 170 has a biconvex structure. The shapes of the lenses of the fourth lens 140 to the seventh lens 170 are matched in the above manner, so that the correction of monochromatic aberration is facilitated, and meanwhile, the compact structure of the whole fixed-focus lens can be ensured, and the integration level of the fixed-focus lens is high.
On the basis of the above embodiment, the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, the sixth lens 160 and the seventh lens 170 are all glass spherical lenses, and the third lens 130 and the eighth lens 180 are all plastic aspherical lenses.
Specifically, the spherical lens is characterized in that the constant curvature is arranged from the center of the lens to the periphery of the lens, and the lens is ensured to be arranged in a simple mode. And the spherical lens can be a glass spherical lens, so that the first lens 110, the second lens 120, the fourth lens 140, the fifth lens 150, the sixth lens 160 and the seventh lens 170 are all glass spherical lenses, which can balance high and low temperatures, and is beneficial to keeping the focal length of the fixed focus lens stable when the environmental temperature used by the fixed focus lens is greatly changed, for example, ensuring that the fixed focus lens has stable optical performance at-40-85 ℃. In addition, since the thickness of the first lens 110 is relatively large, the preparation process of the first lens 110 can be ensured to be simple by arranging the glass spherical lens of the first lens 110.
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 a better radius of curvature characteristic, unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, 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 the imaging quality of the lens is improved. For example, the third lens 130 and the eighth lens 180 are aspheric lenses, so as to correct off-axis aberrations of the system, optimize optical performance such as distortion and CRA, and improve imaging quality. On the basis, the aspherical lens can be a plastic aspherical lens, which is beneficial to reducing the processing technology of the aspherical lens and has lower cost. In addition, as the cost of the aspherical lens made of plastic is far lower than that of the spherical lens made of glass, the cost of the fixed-focus lens can be effectively controlled while the optical performance of the fixed-focus lens is ensured by adopting a mode of mixing and matching the glass spherical lens and the plastic aspherical lens in the fixed-focus lens provided by the embodiment of the invention; meanwhile, the materials of the lenses have mutual compensation effect, so that the lens can be ensured to be normally used in high and low temperature environments.
On the basis of the above-described embodiment, the sixth lens 160 and the seventh lens 170 are cemented to form a cemented lens.
Specifically, the sixth lens 160 and the seventh lens 170 are disposed in a cemented lens, which can be understood as the image side surface of the sixth lens 160 being cemented with the object side surface of the seventh lens 170. The cemented lens can be used for reducing chromatic aberration to the greatest extent or eliminating chromatic aberration, and the cemented lens can improve image quality and reduce reflection loss of light energy in the fixed-focus lens, so that imaging definition of the lens is improved. In addition, the use of the cemented lens can simplify the assembly procedure in the lens manufacturing process and improve the equipment efficiency. Illustratively, by incorporating a cemented lens of sixth lens 160 and seventh lens 170, chromatic aberration effects can be eliminated, reducing tolerance sensitivity; meanwhile, the cemented lens can balance the overall chromatic aberration of the optical system. The gluing of the lenses omits the air interval between the two lenses, so that the whole optical system is compact, and the miniaturization requirement of the system is met. Moreover, the gluing of the lenses reduces tolerance sensitivity problems such as tilting/decentering of the lens unit during assembly. Further, the sixth lens 160 and the seventh lens 170 may be supported by a spacer, or may be glued by glue bonding, and the specific arrangement mode of the glued lens is not limited in the present invention.
On the basis of the above-described embodiment, the first lens 110 has negative optical power; the second lens 120 has negative optical power; the third lens 130 has negative optical power; the fourth lens 140 has positive optical power; the fifth lens 150 has positive optical power; the sixth lens 160 and the seventh lens 170 are cemented together to form a cemented lens having negative optical power; the eighth lens 180 has positive optical power.
Specifically, the optical power is equal to the difference between the convergence of the image side beam and the convergence of the object side beam, which characterizes the ability of the optical system to deflect light. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. When the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a refractive surface of a lens (i.e. a surface of a lens), for characterizing a lens, or for characterizing a system of lenses together (i.e. a lens group). In the fixed focus lens provided in this embodiment, the first lens 110, the second lens 120 and the third lens 130 are provided as negative focal power lenses, so that the first lens 110, the second lens 120 and the third lens 130 can be ensured to realize effective deflection on incident light rays with large angles, and then the field angle of the fixed focus lens can be effectively increased, and the optical system can be ensured to have wide-angle or super-wide-angle characteristics. And the first lens 110 is set as a negative focal power lens and is used for controlling the position of the entrance pupil to be at a reasonable position so as to reduce the caliber of the front end of the lens. The fourth lens 140 is a positive focal power lens, so that the fourth lens 140 can correct larger aberrations generated by the first lens 110, the second lens 120 and the third lens 130 in time, and particularly can have an obvious correcting effect on the edge aberrations of the optical system, thereby improving the imaging resolution of the optical system. Further, the fifth lens 150 is a positive focal power lens, and the cemented lens formed by the sixth lens 160 and the seventh lens 170, which are cemented together, has negative focal power, which is also beneficial to eliminating aberration, including field curvature, coma and astigmatism, and further improves the imaging resolution of the optical system. The eighth lens 180 is further provided as a positive focal power lens, so that an image finally imaged on an image plane can be corrected in time, and particularly, an obvious correction effect is achieved on the edge aberration of the optical system, so that the imaging effect is improved.
On the basis of the above embodiment, the lens power isThe first lens has optical power of +>The second lens has optical power of->The third lens has optical power of->The fourth lens has optical power of +>The fifth lens has optical power +.>The optical power of the cemented lens is +.>The eighth lens power is->Wherein:
by limiting the ratio of the focal power of each lens to the focal power of the fixed focus lens in the range, the system aberration can be corrected, and the imaging effect can be improved.
Based on the above embodiment, the refractive index of the first lens 110 is n1, the refractive index of the second lens 120 is n2, the refractive index of the third lens 130 is n2, the refractive index of the fourth lens 140 is n4, the refractive index of the fifth lens 150 is n5, the refractive index of the sixth lens 160 is n6, the refractive index of the seventh lens 170 is n7, and the refractive index of the eighth lens 180 is n8; wherein n1 is more than or equal to 1.72 and less than or equal to 1.87; n2 is more than or equal to 1.57 and less than or equal to 1.80; n3 is more than or equal to 1.49 and less than or equal to 1.74; n4 is more than or equal to 1.54 and less than or equal to 1.80; n5 is more than or equal to 1.49 and less than or equal to 1.67; n6 is more than or equal to 1.70 and less than or equal to 1.84; n7 is more than or equal to 1.56 and less than or equal to 1.86; n8 is more than or equal to 1.48 and less than or equal to 1.69.
Specifically, the refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used to describe the refractive power of materials to light, and the refractive indexes of different materials are different. By setting the refractive indices of the first lens 110 to the eighth lens 180 within the above-described range, the system aberration can be further corrected, and the imaging effect can be improved.
On the basis of the embodiment, the image plane diameter of the fixed focus lens is IC, and the total length of the fixed focus lens is TTL; wherein, the IC/TTL is more than or equal to 0.24. Thus, the target surface of the optical system can be increased while the performance of the optical system is ensured.
On the basis of the embodiment, the field angle FOV of the fixed focus lens satisfies FOV > 140 °, that is, the fixed focus lens is a wide angle lens.
On the basis of the above embodiment, the fixed focus lens further includes a diaphragm 190 and an optical filter 200; the diaphragm 190 is disposed in the optical path between the fifth lens 150 and the sixth lens 160; the filter 200 is disposed in the optical path between the eighth lens 180 and the image plane.
Specifically, the traveling direction of the light beam can be adjusted by providing the diaphragm 190, which is advantageous for improving the imaging quality. And in the fixed-focus lens, the diaphragm 190 can be positioned on the light path between the fifth lens 150 and the sixth lens 160, and the diaphragm 190 is positioned in the middle of the fixed-focus lens, so that the front-back caliber of the fixed-focus lens can be ensured to be minimized. Further, the optical filter 200 is disposed in the optical path between the eighth lens element 180 and the image plane, and the optical filter 200 can filter out the stray spectrum, so as to ensure the imaging quality. Further, the fixed focus lens can also comprise plate glass, and plays a role in protecting the lens and the earth image sensor.
As a possible embodiment, the parameters of each lens in the fixed focus lens are explained next.
Table 1 an optical design value of a fixed focus lens in an embodiment
TABLE 2 design values of surface type, radius of curvature, thickness, refractive index, abbe number and half diameter of each lens in fixed focus lens
| Face number | Surface type | Radius of curvature | Thickness of (L) | Material (nd) | Material (vd) | Half diameter of |
| S1 | Spherical surface | 51.070 | 2.321 | 24.811 | ||
| S2 | Spherical surface | 21.650 | 1.334 | 1.768 | 80.001 | 15.960 |
| S3 | Spherical surface | 9.484 | 8.641 | 9.482 | ||
| S4 | Spherical surface | 60.613 | 0.700 | 1.617 | 80.000 | 9.418 |
| S5 | Spherical surface | 11.719 | 7.403 | 8.029 | ||
| S6 | Aspherical surface | -21.771 | 4.833 | 1.684 | 19.000 | 7.481 |
| S7 | Aspherical surface | -24.746 | 0.208 | 7.350 | ||
| S8 | Spherical surface | -83.508 | 7.997 | 1.595 | 22.148 | 7.131 |
| S9 | Spherical surface | -32.402 | 2.521 | 6.800 | ||
| S10 | Spherical surface | 8.317 | 7.115 | 1.536 | 94.500 | 5.000 |
| S11 | Spherical surface | -101.216 | 3.658 | 3.619 | ||
| STO | Spherical surface | PL | 0.825 | 2.021 | ||
| S13 | Spherical surface | -4.869 | 0.687 | 1.786 | 27.999 | 2.600 |
| S14 | Spherical surface | 10.256 | 1.673 | 1.813 | 94.501 | 3.095 |
| S15 | Spherical surface | -12.064 | 0.097 | 3.463 | ||
| S16 | Aspherical surface | 13.857 | 7.256 | 1.641 | 23.001 | 6.000 |
| S17 | Aspherical surface | -12.091 | 0.100 | 5.362 | ||
| S18 | Spherical surface | PL | 1.650 | 1.517 | 64.212 | 5.604 |
| S19 | Spherical surface | PL | 6.792±0.5 | 5.945 |
In table 2, the surface numbers are numbered according to the surface order of the respective lenses, "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, and so on. "STO" represents the stop of the lens. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents the curvature of the surface toward the object plane, a negative value represents the curvature of the surface toward the image plane, where "infinite" represents the surface as a plane and the radius of curvature is infinity. The thickness represents the center axial distance from the current surface to the next surface. nd represents the refractive index, representing the ability of the material between the current surface and the next surface to deflect light. The space represents the current position as air and the refractive index is 1.vd represents the abbe constant, representing the dispersive properties of the material from the current surface to the next surface for light, and space represents the current position as air.
Table 3 design values of aspherical coefficients of different lenses in example one
The value of K in Table 3 represents the magnitude of the conic coefficient of the aspheric surface, "-1.280223E-04" means-1.280223 x 10 -4 The remaining coefficients are all represented in this manner.
The aspherical cone coefficients can be defined by the following aspherical formula, but are not limited to the following representation:
wherein Z is the sagittal height of the aspheric surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate perpendicular to the optical axis, a i For higher order term coefficients, a i r 2i High order terms that are aspheric; a, a 2 、a 3 、a 4 、a 5 And a 6 The 4 th, 6 th, 8 th, 10 th and 12 th order coefficients of the aspherical polynomial, respectively.
The optical system of this embodiment achieves the following technical indexes:
focal length: 5.352mm
An aperture: f2.52
Angle of view: 143.6 DEG
Total optical length: 63.49mm
Image plane size: phi 16.336mm.
Fig. 2 is a schematic diagram of a spherical aberration curve of a fixed focus lens according to an embodiment of the present invention, specifically, a schematic diagram of a spherical aberration curve with a pupil radius of 1.0292 mm. The vertical direction represents normalization of the 0 field pupil plane, 0 represents the pupil center, and the vertical direction vertex represents the pupil vertex; the horizontal direction is spherical aberration of different wavelengths, in micrometers (μm). As can be seen from FIG. 2, the spherical aberration of the lens is within 0.07mm under the light rays with different wavelengths (0.436 μm, 0.486 μm, 0.588 μm and 0.656 μm), and the curves with different wavelengths are relatively concentrated, which indicates that the spherical aberration of the lens is very small.
Fig. 3 is a schematic distortion diagram of a fixed focus lens according to a first embodiment of the present invention, specifically, a schematic distortion diagram with a maximum field angle of 71.8 °, wherein horizontal coordinates represent the magnitude of distortion, and the unit is; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 3, the aberration of the lens provided by the embodiment is well corrected, and the imaging aberration is less than 50%.
In summary, the fixed focus lens provided by the embodiment of the invention comprises eight lenses by arranging the fixed focus lens, and the surface sizes of the first lens, the second lens, the third lens and the eighth lens are reasonably arranged, so that the lens processing difficulty is reduced, the illuminance and the sensitivity of the lens are improved, the aberration of the lens is balanced, the imaging effect of the fixed focus lens is improved, and the focal length 5.352mm, the aperture F2.52, the field angle 143.6, the total optical length 63.49mm and the image surface size are realizedThe optical system of the 1' target sensor chip can be matched.
Example two
Fig. 4 is a schematic structural diagram of a fixed-focus lens according to a second embodiment of the present invention, as shown in fig. 4, where the fixed-focus lens according to the second embodiment of the present invention includes a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a seventh lens element 170, and an eighth lens element 180, in which optical axes are sequentially arranged from an object plane to an image plane, the first lens element 110 includes a first object-side surface near one side of the object plane and a first image-side surface near one side of the image plane, the first object-side surface is a convex surface, and the first image-side surface is a concave surface; the second lens 120 includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface is a convex surface and the second image-side surface is a concave surface; the third lens element 130 comprises a third object-side surface adjacent to the object plane and a third image-side surface adjacent to the image plane, wherein the third object-side surface is concave and the third image-side surface is convex; the eighth lens element comprises an eighth object side surface close to the object plane and an eighth image side surface close to the image plane, wherein the eighth object side surface is convex, and the eighth image side surface is convex.
The setting manner of the lens is the same as that of the first embodiment, and will not be described herein.
As another possible embodiment, specific parameters in the fixed focus lens are described below.
Table 4 an optical design value of the fixed focus lens in the second embodiment
TABLE 5 design values of surface type, radius of curvature, thickness, refractive index, abbe number and half diameter of each lens in fixed focus lens
| Face number | Surface type | Radius of curvature | Thickness of (L) | Material (nd) | Material (vd) | Half diameter of |
| S1 | Spherical surface | 51.070 | 2.321 | 23.899 | ||
| S2 | Spherical surface | 23.218 | 3.503 | 1.823 | 33.195 | 15.805 |
| S3 | Spherical surface | 9.361 | 6.023 | 9.020 | ||
| S4 | Spherical surface | 41.828 | 1.051 | 1.752 | 33.191 | 8.897 |
| S5 | Spherical surface | 9.432 | 5.362 | 7.024 | ||
| S6 | Aspherical surface | -12.579 | 3.941 | 1.535 | 55.711 | 6.977 |
| S7 | Aspherical surface | -15.224 | 0.100 | 7.211 | ||
| S8 | Spherical surface | -69.692 | 7.740 | 1.753 | 28.916 | 6.937 |
| S9 | Spherical surface | -21.963 | 2.026 | 6.500 | ||
| S10 | Spherical surface | 9.323 | 8.001 | 1.613 | 61.694 | 5.109 |
| S11 | Spherical surface | -55.881 | 0.237 | 2.403 | ||
| STO | Spherical surface | PL | 3.264 | 2.238 | ||
| S13 | Spherical surface | -6.533 | 0.699 | 1.747 | 26.000 | 3.060 |
| S14 | Spherical surface | 7.239 | 2.702 | 1.625 | 70.000 | 4.216 |
| S15 | Spherical surface | -16.289 | 0.099 | 4.606 | ||
| S16 | Aspherical surface | 13.000 | 4.331 | 1.535 | 55.711 | 6.500 |
| S17 | Aspherical surface | -8.589 | 0.171 | 6.822 | ||
| S18 | Spherical surface | PL | 1.496 | 1.517 | 64.212 | 7.148 |
| S19 | Spherical surface | PL | 5.846±0.5 | 7.271 |
In table 5, the surface numbers are numbered according to the surface order of the respective lenses, "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, and so on. "STO" represents the stop of the lens. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents the curvature of the surface toward the object plane, a negative value represents the curvature of the surface toward the image plane, where "infinite" represents the surface as a plane and the radius of curvature is infinity. The thickness represents the center axial distance from the current surface to the next surface. nd represents the refractive index, representing the ability of the material between the current surface and the next surface to deflect light. The space represents the current position as air and the refractive index is 1.vd represents the abbe constant, representing the dispersive properties of the material from the current surface to the next surface for light, and space represents the current position as air.
Table 6 design values of aspherical coefficients of different lenses in example two
The value of K in Table 6 represents the magnitude of the conic coefficient of the aspheric surface, and "1.939294E-05" represents 1.939294×10 -5 The remaining coefficients are all represented in this manner.
The aspherical cone coefficients can be defined by the following aspherical formula, but are not limited to the following representation:
wherein Z is the sagittal height of the aspheric surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate perpendicular to the optical axis, a i For higher order term coefficients, a i r 2i High order terms that are aspheric; a, a 2 、a 3 、a 4 、a 5 And a 6 The 4 th, 6 th, 8 th, 10 th and 12 th order coefficients of the aspherical polynomial, respectively.
The optical system of this embodiment achieves the following technical indexes:
focal length: 5.145mm
An aperture: f2.64
Angle of view: 144.5 DEG
Total optical length: 56.59mm
Image plane size: phi 16.105mm.
Fig. 5 is a schematic diagram of a spherical aberration curve of a fixed focus lens according to a second embodiment of the present invention, specifically, a schematic diagram of a spherical aberration curve with a pupil radius of 0.9894 mm. The vertical direction represents normalization of the 0 field pupil plane, 0 represents the pupil center, and the vertical direction vertex represents the pupil vertex; the horizontal direction is spherical aberration of different wavelengths, in micrometers (μm). As can be seen from FIG. 5, the spherical aberration of the lens is within 0.02mm for the light rays with different wavelengths (0.436 μm, 0.486 μm, 0.588 μm and 0.656 μm), and the curves with different wavelengths are relatively concentrated, which means that the spherical aberration of the lens is very small.
Fig. 6 is a schematic distortion diagram of a fixed focus lens provided in the second embodiment of the present invention, specifically, a schematic distortion diagram with a maximum field angle of 72.230 °, wherein horizontal coordinates represent the magnitude of distortion, and the unit is; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 6, the aberration of the lens provided by the embodiment is well corrected, and the imaging aberration is less than 50%.
In summary, the fixed focus lens provided by the embodiment of the invention comprises eight lenses, and the surface sizes phi 16.105mm of the first lens, the second lens, the third lens and the eighth lens are reasonably arranged, so that the lens processing difficulty is reduced, meanwhile, the illuminance and the sensitivity of the lens are improved, the aberration of the lens is balanced, the imaging effect of the fixed focus lens is improved, the focal length 5.145mm, the aperture F2.64, the field angle 144.5 degrees, the total optical length 56.59mm and the image surface size phi 16.105mm are realized, and the optical system of the 1' target surface sensor chip can be matched.
Example III
Fig. 7 is a schematic structural diagram of a fixed focus lens according to a third embodiment of the present invention, as shown in fig. 7, the fixed focus lens according to the third embodiment of the present invention includes a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a seventh lens element 170 and an eighth lens element 180, in which optical axes are sequentially arranged from an object plane to an image plane, the first lens element 110 includes a first object-side surface near the object plane and a first image-side surface near the image plane, the first object-side surface is a convex surface, and the first image-side surface is a concave surface; the second lens 120 includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface is a convex surface and the second image-side surface is a concave surface; the third lens element 130 comprises a third object-side surface adjacent to the object plane and a third image-side surface adjacent to the image plane, wherein the third object-side surface is concave and the third image-side surface is convex; the eighth lens element comprises an eighth object side surface close to the object plane and an eighth image side surface close to the image plane, wherein the eighth object side surface is convex, and the eighth image side surface is convex.
The setting manner of the lens is the same as that of the first embodiment, and will not be described herein.
As another possible embodiment, specific parameters in the fixed focus lens are described below.
Table 7 an optical design value of a fixed-focus lens in a third embodiment
TABLE 8 design values of surface type, radius of curvature, thickness, refractive index, abbe number and half diameter of each lens in fixed focus lens
| Face number | Surface type | Radius of curvature | Thickness of (L) | Material (nd) | Material (vd) | Half diameter of |
| S1 | Spherical surface | 51.070 | 2.321 | 21.116 | ||
| S2 | Spherical surface | 23.348 | 2.000 | 1.803 | 49.001 | 13.839 |
| S3 | Spherical surface | 9.239 | 5.196 | 8.684 | ||
| S4 | Spherical surface | 38.223 | 0.764 | 1.736 | 54.680 | 8.599 |
| S5 | Spherical surface | 9.089 | 5.299 | 6.899 | ||
| S6 | Aspherical surface | -12.085 | 4.000 | 1.690 | 23.000 | 6.858 |
| S7 | Aspherical surface | -15.301 | 0.100 | 7.284 | ||
| S8 | Spherical surface | -65.209 | 7.964 | 1.731 | 55.000 | 7.000 |
| S9 | Spherical surface | -22.070 | 4.606 | 6.625 | ||
| S10 | Spherical surface | 9.267 | 7.952 | 1.617 | 60.000 | 4.300 |
| S11 | Spherical surface | -57.231 | 0.101 | 2.468 | ||
| STO | Spherical surface | PL | 3.534 | 2.406 | ||
| S13 | Spherical surface | -6.548 | 0.701 | 1.756 | 26.003 | 3.114 |
| S14 | Spherical surface | 6.975 | 2.772 | 1.612 | 49.168 | 4.195 |
| S15 | Spherical surface | -15.959 | 0.310 | 4.587 | ||
| S16 | Aspherical surface | 13.319 | 5.042 | 1.533 | 53.106 | 6.400 |
| S17 | Aspherical surface | -8.549 | 0.033 | 6.896 | ||
| S18 | Spherical surface | PL | 1.650 | 1.517 | 64.212 | 7.235 |
| S19 | Spherical surface | PL | 6.159±0.5 | 7.356 |
In table 8, the surface numbers are numbered according to the surface order of the respective lenses, "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, and so on. "STO" represents the stop of the lens. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents the curvature of the surface toward the object plane, a negative value represents the curvature of the surface toward the image plane, where "infinite" represents the surface as a plane and the radius of curvature is infinity. The thickness represents the center axial distance from the current surface to the next surface. nd represents the refractive index, representing the ability of the material between the current surface and the next surface to deflect light. The space represents the current position as air and the refractive index is 1.vd represents the abbe constant, representing the dispersive properties of the material from the current surface to the next surface for light, and space represents the current position as air.
Table 9 design values of aspherical coefficients of different lenses in third embodiment
The value of K in Table 9 represents the magnitude of the conic coefficient of the aspheric surface, and "4.006309E-05" represents 4.006309 x 10 -5 The remaining coefficients are all represented in this manner.
The aspherical cone coefficients can be defined by the following aspherical formula, but are not limited to the following representation:
wherein Z is the sagittal height of the aspheric surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate perpendicular to the optical axis, a i For higher order term coefficients, a i r 2i High order terms that are aspheric; a, a 2 、a 3 、a 4 、a 5 And a 6 The 4 th, 6 th, 8 th, 10 th and 12 th order coefficients of the aspherical polynomial, respectively.
The optical system of this embodiment achieves the following technical indexes:
focal length: 5.068mm
An aperture: f2.65
Angle of view: 145.0 DEG
Total optical length: 58.18mm
Image plane size: phi 16.113mm.
Fig. 8 is a schematic diagram of a spherical aberration curve of a fixed focus lens according to a third embodiment of the present invention, specifically a schematic diagram of a spherical aberration curve with a pupil radius of 0.9746 mm. The vertical direction represents normalization of the 0 field pupil plane, 0 represents the pupil center, and the vertical direction vertex represents the pupil vertex; the horizontal direction is spherical aberration of different wavelengths, in micrometers (μm). As can be seen from FIG. 8, the spherical aberration of the lens is within 0.02mm for the light rays with different wavelengths (0.436 μm, 0.486 μm, 0.588 μm and 0.656 μm), and the curves with different wavelengths are relatively concentrated, which means that the spherical aberration of the lens is very small.
Fig. 9 is a schematic distortion diagram of a fixed focus lens provided in the third embodiment of the present invention, specifically, a schematic distortion diagram with a maximum field angle of 72.500 °, wherein horizontal coordinates in the diagram represent the magnitude of distortion, and the unit is; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 9, the aberration of the lens provided by the embodiment is well corrected, and the imaging aberration is less than 50%.
In summary, the fixed focus lens provided by the embodiment of the invention comprises eight lenses, and the surface sizes phi 16.113mm of the first lens, the second lens, the third lens and the eighth lens are reasonably arranged, so that the lens processing difficulty is reduced, the illuminance and the sensitivity of the lens are improved, the aberration of the lens is balanced, the imaging effect of the fixed focus lens is improved, the focal length 5.068mm, the aperture F2.65, the field angle 145.0 degrees, the total optical length 58.18.59mm and the image surface size phi 16.113mm are realized, and the optical system of the 1' target surface sensor chip can be matched.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The fixed focus lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens comprises a first object side surface close to one side of the object plane and a first image side surface close to one side of the image plane, the first object side surface is a convex surface, and the first image side surface is a concave surface;
the second lens comprises a second object side surface close to one side of the object plane and a second image side surface close to one side of the image plane, the second object side surface is a convex surface, and the second image side surface is a concave surface;
the third lens comprises a third object side surface close to one side of the object plane and a third image side surface close to one side of the image plane, the third object side surface is a concave surface, and the third image side surface is a convex surface;
the eighth lens element comprises an eighth object-side surface adjacent to the object plane and an eighth image-side surface adjacent to the image plane, wherein the eighth object-side surface is convex, and the eighth image-side surface is convex.
2. The fixed focus lens of claim 1, wherein the fourth lens comprises a fourth object side surface proximate to the object plane side and a fourth image side surface proximate to the image plane side; the fourth object side surface is a concave surface, and the fourth image side surface is a convex surface;
the fifth lens comprises a fifth object side surface close to the object plane side and a fifth image side surface close to the image plane side; the fifth object side surface is a convex surface, and the fifth image side surface is a convex surface;
the sixth lens comprises a sixth object side surface close to the object plane side and a sixth image side surface close to the image plane side; the sixth object side surface is a concave surface, and the sixth image side surface is a concave surface;
the seventh lens comprises a seventh object side surface close to the object plane side and a seventh image side surface close to the image plane side; the seventh object-side surface is convex, and the seventh image-side surface is convex.
3. The fixed focus lens of claim 1, wherein the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all glass spherical lenses, and the third lens and the eighth lens are all plastic aspherical lenses.
4. The fixed focus lens of claim 1, wherein the sixth lens and the seventh lens are cemented together to form a cemented lens.
5. The fixed focus lens of claim 1, wherein the first lens has a negative optical power; the second lens has negative optical power; the third lens has negative focal power; the fourth lens has positive focal power; the fifth lens has positive focal power; the sixth lens and the seventh lens are arranged in a gluing way to form a gluing lens, and the gluing lens has negative focal power; the eighth lens has positive optical power.
6. The fixed focus lens of claim 5, wherein the fixed focus lens has an optical power ofThe first lens power is +.>The second lens has optical power of +>The third lens has optical power of +>The fourth lens power is +.>The fifth lens power is +.>The optical power of the cemented lens is +.>The eighth lens power is +.>
Wherein:
7. the fixed focus lens of claim 1, wherein the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n2, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, the refractive index of the seventh lens is n7, and the refractive index of the eighth lens is n8;
wherein n1 is more than or equal to 1.72 and less than or equal to 1.87; n2 is more than or equal to 1.57 and less than or equal to 1.80; n3 is more than or equal to 1.49 and less than or equal to 1.74; n4 is more than or equal to 1.54 and less than or equal to 1.80; n5 is more than or equal to 1.49 and less than or equal to 1.67; n6 is more than or equal to 1.70 and less than or equal to 1.84; n7 is more than or equal to 1.56 and less than or equal to 1.86; n8 is more than or equal to 1.48 and less than or equal to 1.69.
8. The fixed focus lens of claim 1, wherein an image plane diameter of the fixed focus lens is IC, and a total length of the fixed focus lens is TTL;
wherein, the IC/TTL is more than or equal to 0.24.
9. The fixed focus lens of claim 1, wherein the field angle FOV of the fixed focus lens satisfies FOV > 140 °.
10. The fixed focus lens of claim 1, further comprising a stop and an optical filter;
the diaphragm is arranged in an optical path between the fifth lens and the sixth lens;
the optical filter is arranged in an optical path between the eighth lens and the image plane.
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