CN210072173U - Wide-angle day and night confocal athermalization optical system and camera module applying same - Google Patents
Wide-angle day and night confocal athermalization optical system and camera module applying same Download PDFInfo
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- CN210072173U CN210072173U CN201920780984.8U CN201920780984U CN210072173U CN 210072173 U CN210072173 U CN 210072173U CN 201920780984 U CN201920780984 U CN 201920780984U CN 210072173 U CN210072173 U CN 210072173U
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Abstract
The embodiment of the utility model discloses confocal type of wide angle day night does not have thermalization optical system includes from the object plane to image planes along the optical axis in proper order: 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; the object plane sides of the first lens and the second lens are convex surfaces, the image plane sides of the first lens and the second lens are concave surfaces, and the focal power of the first lens and the focal power of the second lens are negative; the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative; the object plane sides of the fourth lens, the fifth lens and the sixth lens are convex surfaces, the image plane sides are convex surfaces, and focal power of the fourth lens, the fifth lens and the sixth lens is positive; the seventh lens is a biconcave lens, and the focal power of the seventh lens is negative; the eighth lens element is a biconvex lens element, and its focal power is positive. On the other hand, the embodiment of the utility model provides a still provide a camera module. The utility model discloses optical system and camera module mainly comprise 8 pieces of lenses, and the lens number is few, and simple structure is applicable to alert law enforcement appearance and intelligent monitoring field of using.
Description
The technical field is as follows:
the utility model relates to an optical system and the module of making a video recording of using thereof, especially a confocal type of wide angle day night does not have thermalization optical system and the module of making a video recording of using thereof.
Background art:
the existing optical system or module applied to the field of police law enforcement instruments and intelligent monitoring generally has the defects of excessive lenses and complex structure.
The invention content is as follows:
for overcoming current optical system or the module that is applied to alert law enforcement appearance and intelligent monitoring field with law enforcement appearance, the ubiquitous lens is too much, the problem of structure complicacy, the embodiment of the utility model provides a confocal type does not have thermalization optical system of wide angle day night on the one hand.
A wide-angle day and night confocal athermalization optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: 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;
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
the object surface side of the fourth lens is a convex surface, the image surface side of the fourth lens is a convex surface, and the focal power of the fourth lens is positive;
the object surface side of the fifth lens is a convex surface, the image surface side of the fifth lens is a convex surface, and the focal power of the fifth lens is positive;
the object surface side of the sixth lens is a convex surface, the image surface side is a convex surface, and the focal power of the sixth lens is positive;
the object plane side of the seventh lens is a concave surface, the image plane side of the seventh lens is a concave surface, and the focal power of the seventh lens is negative;
the object surface side of the eighth lens element is a convex surface, the image surface side is a convex surface, and the refractive power thereof is positive.
On the other hand, the embodiment of the utility model provides a still provide a camera module.
A camera module at least comprises an optical lens, and the wide-angle day and night confocal athermalization optical system is installed in the optical lens.
The optical system and the camera module of the embodiment of the utility model mainly comprise 8 lenses, the number of the lenses is small, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the optical lens has good optical properties of wide angle, more than 500 ten thousand pixels, day and night confocal property, no thermalization and the like, and is suitable for the field of police law enforcement instruments and intelligent monitoring.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an optical system or a camera module according to the present invention;
fig. 2 is a graph showing curvature of field and distortion of an embodiment of an optical system or a camera module according to the present invention;
FIG. 3 is a color difference diagram of an embodiment of an optical system or a camera module according to the present invention;
fig. 4 is a graph of MTF transfer function under visible light according to the embodiment of the present invention;
fig. 5 is a graph of the MTF transfer function of 950nm infrared light in an embodiment of an optical system or a camera module according to the present invention;
fig. 6 is a relative illumination diagram of an embodiment of an optical system or a camera module according to the present invention;
FIG. 7 is a graph showing the MTF temperature shift at 25 ℃ in an embodiment of an optical system or a camera module of the present invention;
FIG. 8 is a graph of MTF temperature shift at-40 ℃ for an embodiment of an optical system or a camera module of the present invention;
fig. 9 is a MTF temperature drift diagram at a high temperature of 105 ℃ of an embodiment of the optical system or the camera module of the present invention.
The specific implementation mode is as follows:
in order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
When embodiments of the present invention refer to the ordinal numbers "first", "second", etc., it should be understood that the terms are used for distinguishing only when they do express the ordinal order in context.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a wide-angle day-and-night confocal athermalization optical system includes, in order from an object plane to an image plane 10 along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8.
The object surface side of the first lens 1 is a convex surface, the image surface side is a concave surface, and the focal power is negative;
the object surface side of the second lens 2 is a convex surface, the image surface side is a concave surface, and the focal power is negative;
the object plane side of the third lens 3 is a concave surface, the image plane side is a convex surface, and the focal power is negative;
the object surface side of the fourth lens element 4 is a convex surface, the image surface side is a convex surface, and the focal power thereof is positive;
the fifth lens element 5 has a convex object surface side and a convex image surface side, and has positive focal power;
the object surface side of the sixth lens element 6 is a convex surface, the image surface side is a convex surface, and the focal power thereof is positive;
the object plane side of the seventh lens 7 is a concave surface, the image plane side is a concave surface, and the focal power thereof is negative;
the eighth lens element 8 has a convex object surface side and a convex image surface side, and has positive power.
The optical system of the embodiment of the present invention mainly comprises 8 lenses, the number of the lenses is small, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the optical lens has good optical properties of wide angle, more than 500 ten thousand pixels, day and night confocal property, no thermalization and the like, and is suitable for the field of police law enforcement instruments and intelligent monitoring.
Further, as a preferred embodiment of the present invention, but not limited thereto, the sixth lens 6 and the seventh lens 7 are cemented with each other to form a combined lens, and the focal power of the combined lens is negative. The structure is simple and compact, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, but not limited thereto, each lens of the optical system satisfies the following condition:
(1)-0.45<f/f1<-0.32
(2)-0.42<f/f2<-0.28
(3)-0.07<f/f3<-0.01
(4)0.21<f/f4<0.34
(5)0.19<f/f5<0.36
(6)-0.24<f/f67<-0.11
(7)0.27<f/f8<0.43
where f is a focal length of the entire optical system, f1 is a focal length of the first lens 1, f2 is a focal length of the second lens 2, f3 is a focal length of the third lens 3, f4 is a focal length of the fourth lens 4, f5 is a focal length of the fifth lens 5, f67 is a focal length of the combined lens, and f8 is a focal length of the eighth lens 8. The structure is simple, different lenses are mutually combined and the focal power is reasonably distributed, and the optical lens has good optical properties of wide angle, more than 500 ten thousand pixels, day and night confocal property, no thermalization and the like.
Further, as a preferred embodiment of the present invention, but not limited thereto, the focal length f1 of the first lens 1 and the focal length f, the material refractive index Nd1, and the material abbe constant Vd1 of the whole optical system satisfy: -0.45< f/f1< -0.32, Nd 1< 1.97, Vd1 > 32. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the focal length f2 of the second lens 2 and the focal length f, the material refractive index Nd2, and the material abbe constant Vd2 of the whole optical system satisfy: -0.42< f/f2< -0.28, Nd2 > 1.83, Vd 2< 45. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the focal length f3 of the third lens 3 and the focal length f, the material refractive index Nd3, and the material abbe constant Vd3 of the whole optical system satisfy: -0.07< f/f3< -0.01, Nd3 > 1.9, Vd 3< 32. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the focal length f4 of the fourth lens 4 and the focal length f, the material refractive index Nd4, and the material abbe constant Vd4 of the whole optical system satisfy: 0.21< f/f4<0.34, Nd 4< 1.9, Vd4 > 39. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the focal length f5 of the fifth lens 5 and the focal length f, the material refractive index Nd5, and the material abbe constant Vd5 of the whole optical system satisfy: 0.19< f/f5<0.36, Nd 5< 1.6, Vd5 > 67. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limiting, the focal length f67 of the combined lens and the focal length f of the entire optical system satisfy: -0.24< f/f67< -0.11; the refractive index Nd6 of the material and the Abbe constant Vd6 of the material of the sixth lens 6 satisfy that: nd6 is less than 1.6, Vd6 is more than 67; the refractive index Nd7 of the material and the Abbe constant Vd7 of the seventh lens 7 satisfy the following conditions: nd7 is greater than 1.84, Vd7 is less than 25. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the focal length f8 of the eighth lens 8 and the focal length f, the material refractive index Nd8, and the material abbe constant Vd8 of the entire optical system satisfy: 0.27< f/f8<0.43, Nd 8< 1.50, Vd8 > 80. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the aperture stop 9 of the optical system is located between the fifth lens 5 and the fourth lens 4, near the fourth lens 4. Simple structure and is used for adjusting the intensity of the light beam.
Further, as a preferred embodiment of the present invention, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the eighth lens 8 are all glass lenses, and the eighth lens 8 is a glass aspheric lens.
Specifically, as a preferred embodiment of the present invention, without limitation, the optical system of the embodiment of the present invention has a focal length F equal to 2.09mm, a diaphragm index F/NO equal to 2.0, a field angle FOV equal to 160 °, a total optical length TTL equal to 17mm, and the basic parameters of the optical system are as shown in the following table:
in the above table, S1, S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane along the optical axis; s3, S4 correspond to both surfaces of the second lens 2; s5, S6 correspond to both surfaces of the third lens 3; s7, S8 correspond to both surfaces of the fourth lens 4; STO corresponds to the position of the aperture stop 9 of the optical system; s10, S11 correspond to both surfaces of the fifth lens 5; s12, S13 correspond to both surfaces of the sixth lens 6; s13, S14 correspond to both surfaces of the seventh lens 7; s15, S16 correspond to both surfaces of the eighth lens 8.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the surface of the eighth lens 8 is an aspherical shape, which satisfies the following equation:
wherein, the parameter c is 1/R, namely the curvature corresponding to the radius, y is a radial coordinate, the unit of which is the same as the unit of the length of the lens, k is a conic coefficient, a1To a8The coefficients are respectively corresponding to the radial coordinates. The aspheric correlation values of the eighth lens element 8 are shown in the following table:
| K | α1 | α2 | α3 | α4 | α5 | α6 | |
| |
0 | 0 | -6.9E-3 | 4.0E-4 | 9.1E-6 | -6.5E-6 | 6.8 |
| S16 | |||||||
| 0 | 0 | -1.8E-4 | -3.0E-4 | 1.35E-3 | -1.8E-5 | 1.0E-6 |
as can be seen from fig. 2 to fig. 9, the optical system in the embodiment has good optical performance such as wide angle, more than 500 ten thousand pixels, day and night confocal performance, no thermalization, and the like, and is suitable for the field of law enforcement for police and intelligent monitoring.
A camera module at least comprises an optical lens, and the wide-angle day and night confocal athermalization optical system is installed in the optical lens.
The camera module of the embodiment of the present invention mainly comprises 8 lenses, the number of the lenses is small, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the optical lens has good optical properties of wide angle, more than 500 ten thousand pixels, day and night confocal property, no thermalization and the like, and is suitable for the field of police law enforcement instruments and intelligent monitoring.
The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not to be construed as limiting the invention to the precise embodiments disclosed herein. All with the utility model discloses a method, structure etc. are similar, the same, or to the utility model discloses make a plurality of technological deductions or replacement under the design prerequisite, all should regard as the utility model discloses a protection scope.
Claims (10)
1. A wide-angle day and night confocal athermalization optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: 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; it is characterized in that the preparation method is characterized in that,
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
the object surface side of the fourth lens is a convex surface, the image surface side of the fourth lens is a convex surface, and the focal power of the fourth lens is positive;
the object surface side of the fifth lens is a convex surface, the image surface side of the fifth lens is a convex surface, and the focal power of the fifth lens is positive;
the object surface side of the sixth lens is a convex surface, the image surface side is a convex surface, and the focal power of the sixth lens is positive;
the object plane side of the seventh lens is a concave surface, the image plane side of the seventh lens is a concave surface, and the focal power of the seventh lens is negative;
the object surface side of the eighth lens element is a convex surface, the image surface side is a convex surface, and the refractive power thereof is positive.
2. The wide-angle day-and-night confocal athermalization optical system of claim 1, wherein the sixth lens and the seventh lens are cemented together to form a combined lens, and the power of the combined lens is negative.
3. The wide-angle day-and-night confocal athermalization optical system of claim 1, wherein each lens of the optical system satisfies the following condition:
(1)-0.45<f/f1<-0.32
(2)-0.42<f/f2<-0.28
(3)-0.07<f/f3<-0.01
(4)0.21<f/f4<0.34
(5)0.19<f/f5<0.36
(6)-0.24<f/f67<-0.11
(7)0.27<f/f8<0.43
where f is a focal length of the entire optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f67 is a focal length of the combined lens, and f8 is a focal length of the eighth lens.
4. The wide-angle day and night confocal type athermalization optical system according to claim 1, wherein a focal length f1 of the first lens and a focal length f, a material refractive index Nd1 and a material abbe constant Vd1 of the whole optical system satisfy: -0.45< f/f1< -0.32, Nd 1< 1.97, Vd1 > 32.
5. The wide-angle day-night confocal type athermalization optical system according to claim 1, wherein a focal length f2 of the second lens satisfies, with a focal length f of the entire optical system, a refractive index Nd2 of a material, and an abbe constant Vd2 of the material: -0.42< f/f2< -0.28, Nd2 > 1.83, Vd 2< 45.
6. The wide-angle day-night confocal type athermalization optical system according to claim 1, wherein a focal length f3 of the third lens satisfies, with a focal length f of the entire optical system, a refractive index Nd3 of a material, and an abbe constant Vd3 of the material: -0.07< f/f3< -0.01, Nd3 > 1.9, Vd 3< 32.
7. The wide-angle day and night confocal type athermalization optical system according to claim 1, wherein a focal length f4 of the fourth lens satisfies, with a focal length f of the entire optical system, a refractive index Nd4 of a material, and an abbe constant Vd4 of the material: 0.21< f/f4<0.34, Nd 4< 1.9, Vd4 > 39.
8. The wide-angle day-night confocal type athermalization optical system according to claim 1, wherein a focal length f5 of the fifth lens satisfies, with a focal length f of the entire optical system, a refractive index Nd5 of a material, and an abbe constant Vd5 of the material: 0.19< f/f5<0.36, Nd 5< 1.6, Vd5 > 67.
9. The wide-angle day-and-night confocal type athermalized optical system of claim 2, wherein the focal length f67 of the combined lens and the focal length f of the entire optical system satisfy: -0.24< f/f67< -0.11; the refractive index Nd6 of the material and the Abbe constant Vd6 of the material of the sixth lens satisfy that: nd6 is less than 1.6, Vd6 is more than 67; the refractive index Nd7 of the material and the Abbe constant Vd7 of the material of the seventh lens satisfy the following conditions: nd7 is greater than 1.84, Vd7 is less than 25.
10. A camera module comprising at least an optical lens, wherein the wide-angle day-night confocal athermalized optical system of any one of claims 1 to 9 is mounted in the optical lens.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161655A (en) * | 2019-05-28 | 2019-08-23 | 广东弘景光电科技股份有限公司 | Wide-angle day and night camera module of the confocal type without thermalization optical system and its application |
| CN114675404A (en) * | 2022-05-27 | 2022-06-28 | 江西联创电子有限公司 | Optical lens |
| CN114675406A (en) * | 2022-05-27 | 2022-06-28 | 江西联创电子有限公司 | Optical lens |
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2019
- 2019-05-28 CN CN201920780984.8U patent/CN210072173U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161655A (en) * | 2019-05-28 | 2019-08-23 | 广东弘景光电科技股份有限公司 | Wide-angle day and night camera module of the confocal type without thermalization optical system and its application |
| CN114675404A (en) * | 2022-05-27 | 2022-06-28 | 江西联创电子有限公司 | Optical lens |
| CN114675406A (en) * | 2022-05-27 | 2022-06-28 | 江西联创电子有限公司 | Optical lens |
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