CN114911039A - Infrared large-aperture low-distortion optical system and camera module applying same - Google Patents
Infrared large-aperture low-distortion optical system and camera module applying same Download PDFInfo
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- CN114911039A CN114911039A CN202210338631.9A CN202210338631A CN114911039A CN 114911039 A CN114911039 A CN 114911039A CN 202210338631 A CN202210338631 A CN 202210338631A CN 114911039 A CN114911039 A CN 114911039A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 59
- 239000000463 material Substances 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 230000000007 visual effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
This application is a divisional application with application number 201710201169.7. The embodiment of the invention discloses an infrared large-aperture low-distortion optical system, which is sequentially provided with the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, and a third 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 positive; the object surface side of the second lens is a concave surface, the image surface side of the second lens is a convex surface, and the focal power of the second lens is negative; the object surface side of the third lens is a convex surface, the image surface side of the third lens is a concave surface, and the focal power of the third lens is positive; and each lens of the optical system satisfies the following conditions: (1)5< f1< 10; (2) -50< f2< -20; (3)5< f3< 10. On the other hand, the embodiment of the invention also provides a camera module. The embodiment of the invention is composed of three lenses, and has simple structure; meanwhile, the combination of different lenses and the reasonable distribution of focal power realize good performances of large aperture, large visual angle, low distortion and the like.
Description
The application is a divisional application, the application number of the original application is 201710201169.7, the application date is 3 months and 30 days in 2017, and the invention is named as a large-aperture low-distortion infrared optical system and a camera module applied by the large-aperture low-distortion infrared optical system.
The technical field is as follows:
the invention relates to an infrared optical system and a camera module applied by the same, in particular to an infrared large-aperture low-distortion optical system consisting of three lenses and a camera module applied by the same.
Background art:
the existing infrared optical system or camera module applied to the automobile auxiliary driving technology generally has the defects of too many lenses and complex structure.
The invention content is as follows:
in order to solve the problems of excessive lenses and complex structure of the existing infrared optical system or camera module, the embodiment of the invention provides an infrared large-aperture low-distortion optical system on the one hand.
Infrared big light ring low distortion optical system follows the optical axis and follows the object plane to image plane and be equipped with in proper order: a first lens, a second lens, and a third 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 positive;
the object surface side of the second lens is a concave surface, the image surface side of the second lens is a convex surface, and the focal power of the second lens is negative;
the object surface side of the third lens is a convex surface, the image surface side of the third lens is a concave surface, and the focal power of the third lens is positive;
and each lens of the optical system satisfies the following conditions: (1)5< f1< 10; (2) -50< f2< -20; (3)5< f3< 10; (4)0.5< f1/f < 2.0; where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f is the focal length of the entire optical system.
On the other hand, the embodiment of the invention also provides a camera module.
The camera module at least comprises an optical lens, and the infrared large-aperture low-distortion optical system is installed in the optical lens.
The embodiment of the invention is composed of three lenses, and the structure is simple; meanwhile, the combination of different lenses and the reasonable distribution of focal power realize good performances of large aperture, large visual angle, low distortion and the like.
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 introduced 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 based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a camera optical system or a camera module according to the present invention;
FIG. 2 is a diagram showing the distortion curve of the camera optical system or camera module of the present invention at +25 ℃;
FIG. 3 is a MTF curve of the camera optical system or camera module of the present invention at +25 ℃;
FIG. 4 is a diagram of relative illumination of the camera optical system or camera module of the present invention at +25 ℃;
FIG. 5 is a MTF curve of the image pickup optical system or the image pickup module of the present invention at-40 ℃;
fig. 6 is a MTF curve chart of the imaging optical system or the imaging module of the present invention at +85 ℃.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, an infrared large-aperture low-distortion optical system is provided with, in order from an object plane to an image plane along an optical axis: a first lens, a second lens, and a third 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 positive; the object surface side of the second lens is a concave surface, the image surface side of the second lens is a convex surface, and the focal power of the second lens is negative; the object surface side of the third lens is a convex surface, the image surface side of the third lens is a concave surface, and the focal power of the third lens is positive; and each lens of the optical system satisfies the following conditions: (1)5< f1< 10; (2) -50< f2< -20; (3)5< f3< 10; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.
The embodiment of the invention is composed of three lenses, and has simple structure; meanwhile, the combination of different lenses and the reasonable distribution of focal power realize good performances of large aperture, large visual angle, low distortion and the like.
Further, each lens of the optical system also satisfies the following condition: (1)0.5< f1/f < 2.0; (2) -15< f2/f < -5.0; (3)1.0< f3/f < 2.0; where f is the focal length of the entire optical system. The combination of different lenses and the reasonable distribution of focal power realize good performances of large aperture, large visual angle, low distortion and the like.
Still further, the refractive index Nd1 of the material and the Abbe constant Vd1 of the material of the first lens satisfy the following conditions: 1.80< Nd1<1.95, 20< Vd1< 40. Simple structure, and can ensure good optical performance.
Still further, the refractive index Nd2 of the material and the Abbe constant Vd2 of the material of the second lens satisfy the following conditions: 1.55< Nd2<1.65, 20< Vd2< 40. Simple structure and can ensure good optical performance.
Further, the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens satisfy: 1.45< Nd3<1.65, 40< Vd3< 60. Simple structure and can ensure good optical performance.
Specifically, the stop of the optical system is disposed between the first lens and the second lens, and near the first lens side. Simple structure and is used for adjusting the intensity of the light beam.
More specifically, the image sensor further comprises a narrow-band filter which is arranged between the third lens and the image plane and is used for filtering visible light in the environment so that infrared light passes through and is received by the image plane sensor.
Further, the first lens is a glass spherical lens, and the second lens and the third lens are plastic aspheric lenses. The structure that adopts glass sphere and plastics aspheric surface to combine together can eliminate spherical aberration effectively and to the influence of lens performance, improves optical lens's analytic power, reduces the processing degree of difficulty and the manufacturing cost of camera lens simultaneously.
Specifically, in the present embodiment, the focal length f of the present optical system is 4.63mm, the stop index fno. is 1.5, and the field angle 2 ω is 49.9 °, which is suitable for 1/4 "Sensor. The basic parameters of the optical system are shown in the following table:
| surface of | Radius of curvature R (mm) | Spacing D (mm) | Refractive index Nd | Dispersion value Vd | |
| S1 | 3.750 | 1.20 | 1.910 | 35.25 | |
| S2 | 9.000 | 0.20 | |||
| STO | INFINITY | 1.50 | |||
| S4 | -1.200 | 0.50 | 1.614 | 25.57 | |
| S5 | -1.450 | 0.04 | |||
| S6 | 2.500 | 1.50 | 1.534 | 55.77 | |
| S7 | 5.500 | 0.50 | |||
| S8 | INFINITY | 0.70 | 1.516 | 64.21 | |
| S9 | INFINITY | 0.80 | |||
| | INFINITY | 0 |
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; STO corresponds to the position of the aperture stop 4 of the optical system; s4, S5 correspond to both surfaces of the second lens 2; s6, S7 correspond to both surfaces of the third lens 3; s8, S9 correspond to both surfaces of the narrowband filter located between the third lens 3 and the image plane 5; s10 corresponds to image plane 5.
More specifically, the second lens 2 and the third lens 3 satisfy the following aspherical surface equations:
in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate (the unit is the same as the unit of the lens length), and k is the conic coefficient. When the k coefficient is less than-1, the surface curve is hyperbolic, is parabolic when the k coefficient is equal to-1, is elliptical when the k coefficient is between-1 and 0, and is circular when the k coefficient is equal to 0. a is a 1 To a 8 And the coefficients corresponding to the radial coordinates are respectively expressed, and the shape and the size of the front and the back aspheric surfaces of the lens can be accurately set through the parameters.
The aspherical correlation values of the second lens 2 and the third lens 3 are shown in the following table:
| K | α 1 | α 2 | α 3 | α 4 | |
| S4 | -3.000 | 0 | -0.071817 | -0.008504 | 0.007718 |
| S5 | -0.700 | 0 | -0.011320 | 0.013758 | -0.013110 |
| S6 | -16.000 | 0 | 0.015318 | -0.007795 | -0.000077 |
| |
0 | 0 | -0.019460 | 0.002294 | -0.000641 |
as can be seen from fig. 2 to 6, the optical system in the present embodiment, which uses different lenses in combination and reasonably distributes optical power, achieves good performance of large aperture, large viewing angle, low distortion, and very good athermalization.
A camera module at least comprises an optical lens, wherein the infrared large-aperture low-distortion optical system is arranged in the optical lens.
The camera module of the embodiment of the invention is composed of three lenses, and has a simple structure; meanwhile, the combination of different lenses and the reasonable distribution of focal power realize good performances of large aperture, large visual angle, low distortion and the like.
The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not intended to limit the practice of the invention to the particular forms disclosed. Similar or identical methods, structures and the like as those of the present invention or several technical deductions or substitutions made on the premise of the conception of the present invention should be considered as the protection scope of the present invention.
Claims (9)
1. The infrared large-aperture low-distortion optical system is composed of the following three lenses along an optical axis from an object plane to an image plane in sequence: a first lens, a second lens, and a third 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 positive;
the object surface side of the second lens is a concave surface, the image surface side of the second lens is a convex surface, and the focal power of the second lens is negative;
the object surface side of the third lens is a convex surface, the image surface side of the third lens is a concave surface, and the focal power of the third lens is positive;
and each lens of the optical system satisfies the following conditions:
(1)5<f1<10；
(2)-50<f2<-20；
(3)5<f3<10；
(4)0.5<f1/f<2.0；
where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f is the focal length of the entire optical system.
2. The infrared large-aperture low-distortion optical system as claimed in claim 1, wherein the refractive index Nd1 of the material and the abbe constant Vd1 of the material of the first lens satisfy: 1.80< Nd1<1.95, 20< Vd1< 40.
3. The infrared large-aperture low-distortion optical system as claimed in claim 1, wherein the refractive index Nd2 of the material and the abbe constant Vd2 of the material of the second lens satisfy: 1.55< Nd2<1.65, 20< Vd2< 40.
4. The infrared large-aperture low-distortion optical system as claimed in claim 1, wherein the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens satisfy: 1.45< Nd3<1.65, 40< Vd3< 60.
5. The infrared large-aperture low-distortion optical system as claimed in claim 1, wherein a diaphragm of the optical system is disposed between the first lens and the second lens.
6. The infrared large-aperture low-distortion optical system as claimed in claim 1, further comprising a narrow band filter disposed between the third lens and the image plane for filtering visible light in the environment to allow infrared light to pass through and be received by the image plane sensor.
7. The infrared large aperture low distortion optical system of claim 1 wherein the first lens is a glass spherical lens.
8. The infrared large aperture low distortion optical system of claim 1 wherein the second and third lenses are plastic aspheric lenses.
9. The camera module at least comprises an optical lens, and is characterized in that the infrared large-aperture low-distortion optical system according to any one of claims 1-8 is installed in the optical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210338631.9A CN114911039B (en) | 2017-03-30 | 2017-03-30 | Infrared large-aperture low-distortion optical system and camera module applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710201169.7A CN106842519B (en) | 2017-03-30 | 2017-03-30 | Large-aperture low-distortion infrared optical system and camera module applying same |
| CN202210338631.9A CN114911039B (en) | 2017-03-30 | 2017-03-30 | Infrared large-aperture low-distortion optical system and camera module applying same |
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| KR20130044063A (en) * | 2011-10-21 | 2013-05-02 | 한국광기술원 | Far-infrared camera lens unit |
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| JP4189768B2 (en) * | 2006-10-16 | 2008-12-03 | ソニー株式会社 | Imaging lens and imaging apparatus |
| CN103941378B (en) * | 2013-01-08 | 2016-05-11 | 浙江科技学院 | Far infrared camera lens based on moldable diffraction non-spherical lens |
| CN205809392U (en) * | 2016-06-02 | 2016-12-14 | 厦门颉轩光电有限公司 | A kind of near-infrared optical lens group |
| CN206757168U (en) * | 2017-03-30 | 2017-12-15 | 广东弘景光电科技股份有限公司 | The low distortion infrared optical system of large aperture and its camera module of application |
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- 2017-03-30 CN CN202210338631.9A patent/CN114911039B/en active Active
- 2017-03-30 CN CN201710201169.7A patent/CN106842519B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007206611A (en) * | 2006-02-06 | 2007-08-16 | Matsushita Electric Ind Co Ltd | Single focal imaging lens and imaging apparatus having the same |
| JP2008203307A (en) * | 2007-02-16 | 2008-09-04 | Komatsu Lite Seisakusho:Kk | Imaging lens |
| CN202102169U (en) * | 2011-03-21 | 2012-01-04 | 大立光电股份有限公司 | Image capturing lens assembly |
| KR20130044063A (en) * | 2011-10-21 | 2013-05-02 | 한국광기술원 | Far-infrared camera lens unit |
| CN103217785A (en) * | 2012-01-20 | 2013-07-24 | 大立光电股份有限公司 | Image capturing lens system |
| US20160223789A1 (en) * | 2015-01-29 | 2016-08-04 | Ability Opto-Electronics Technology Co., Ltd. | Optical image capturing system |
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| CN114911039B (en) | 2024-02-27 |
| CN106842519B (en) | 2022-05-03 |
| CN106842519A (en) | 2017-06-13 |
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