CN114911039B - 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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- CN114911039B CN114911039B CN202210338631.9A CN202210338631A CN114911039B CN 114911039 B CN114911039 B CN 114911039B CN 202210338631 A CN202210338631 A CN 202210338631A CN 114911039 B CN114911039 B CN 114911039B
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- 238000003384 imaging method Methods 0.000 claims description 14
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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
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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 sequentially comprises 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 plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive; the object plane side of the second lens is a concave surface, the image plane side is a convex surface, and the focal power of the second lens is negative; the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive; and each lens of the optical system satisfies the following condition: (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 consists of three lenses, and has simple structure; meanwhile, the combination of different lenses and the reasonable distribution of the focal power realize the 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 30 days of 3 months in 2017, and the invention is named as a large-aperture low-distortion infrared optical system and an imaging module applied by the same.
Technical field:
the invention relates to an infrared optical system and an imaging module applied to the infrared optical system, in particular to an infrared large-aperture low-distortion optical system composed of three lenses and an imaging module applied to the infrared large-aperture low-distortion optical system.
The background technology is as follows:
the existing infrared optical system or camera module applied to the automobile auxiliary driving technology has the defects of excessive lenses and complex structure.
The invention comprises the following steps:
in order to solve the problems of excessive lenses and complex structure of the existing infrared optical system or camera module, one aspect of the embodiment of the invention provides an infrared large-aperture low-distortion optical system.
The infrared large aperture low distortion optical system is provided with: a first lens, a second lens, and a third lens;
the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens is a concave surface, the image plane side is a convex surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive;
and each lens of the optical system satisfies the following condition: (1) 5< f1<10; (2) -50< f2< -20; (3) 5< f3<10; (4) 0.5< f1/f <2.0; wherein 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 whole optical system.
On the other hand, the embodiment of the invention also provides a camera module.
The image pickup module at least comprises an optical lens, and the infrared large-aperture low-distortion optical system is arranged in the optical lens.
The embodiment of the invention consists of three lenses, and has simple structure; meanwhile, the combination of different lenses and the reasonable distribution of the focal power realize the 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 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 diagram of an image capturing optical system or an image capturing module according to the present invention;
FIG. 2 is a graph of distortion of an imaging optical system or imaging module of the present invention at +25deg.C;
FIG. 3 is a graph showing the MTF of an imaging optical system or imaging module of the present invention at +25℃;
FIG. 4 is a graph showing the relative illuminance of an imaging optical system or an imaging module at +25deg.C according to the present invention;
FIG. 5 is a graph of MTF at-40 ℃ for an imaging optical system or imaging module of the present invention;
fig. 6 is an MTF graph of the imaging optical system or imaging module of the present invention at +85 ℃.
The specific embodiment is as follows:
in order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the 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 for purposes of illustration only and are not intended to limit the scope of 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 plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive; the object plane side of the second lens is a concave surface, the image plane side is a convex surface, and the focal power of the second lens is negative; the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive; and each lens of the optical system satisfies the following condition: (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 consists of three lenses, and has simple structure; meanwhile, the combination of different lenses and the reasonable distribution of the focal power realize the 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 optical power are adopted to realize the good performances of large aperture, large visual angle, low distortion and the like.
Still further, the material refractive index Nd1, the material abbe constant Vd1 of the first lens satisfy: 1.80< Nd1<1.95, 20< Vd1<40. The structure is simple, and good optical performance can be ensured.
Still further, the refractive index Nd2 of the material and the abbe constant Vd2 of the second lens satisfy: 1.55< Nd2<1.65, 20< Vd2<40. The structure is simple, and good optical performance can be ensured.
Further, the refractive index Nd3 of the material and the abbe constant Vd3 of the third lens satisfy: 1.45< Nd3<1.65, 40< Vd3<60. The structure is simple, and good optical performance can be ensured.
Specifically, a stop of the optical system is disposed between the first lens and the second lens, and is close to the first lens side. The structure is simple, and the device is used for adjusting the intensity of the light beam.
More specifically, a narrowband filter is disposed between the third lens and the image plane for filtering visible light in the environment such 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 aspherical lenses. By adopting the structure of combining the glass spherical surface and the plastic aspheric surface, the influence of spherical aberration on the performance of the lens can be effectively eliminated, the resolving power of the optical lens is improved, and the processing difficulty and the production cost of the lens are reduced.
Specifically, in the present embodiment, the focal length f of the present optical system is 4.63mm, the diaphragm index fno is 1.5, the angle of view 2ω=49.9°, and 1/4"sensor is suitable. The basic parameters of the optical system are shown in the following table:
| surface of the body | Radius of curvature R (mm) | Interval 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 | ||
| S10 | INFINITY | 0 |
In the table, S1 and S2 are two surfaces of the first lens 1 along the optical axis from the object plane to the image plane; STO corresponds to the position of the optical system aperture stop 4; s4 and S5 correspond to two surfaces of the second lens 2; s6 and S7 correspond to two surfaces of the third lens 3; s8 and S9 correspond to two surfaces of the narrow-band filter positioned between the third lens 3 and the image plane 5; s10 corresponds to the image plane 5.
More specifically, the second lens 2 and the third lens 3 satisfy the following aspherical equation:where, 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 smaller than-1, the surface type curve is a hyperbola, parabolic when the k coefficient is equal to-1, elliptical when the k coefficient is between-1 and 0, and circular when the k coefficient is equal to 0. a, a 1 To a 8 The parameters are used for accurately setting the shape and the size of the aspherical surfaces on the front and the back surfaces of the lens.
The asphericity-related 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 |
| S7 | 0 | 0 | -0.019460 | 0.002294 | -0.000641 |
as can be seen from fig. 2 to 6, the optical system in the present embodiment adopts different lenses to combine with each other and reasonably distribute optical power to achieve good performances of large aperture, large viewing angle, low distortion, and very good athermalization.
The 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 consists of three lenses, and has simple structure; meanwhile, the combination of different lenses and the reasonable distribution of the focal power realize the good performances of large aperture, large visual angle, low distortion and the like.
The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of the invention to such description. The method, structure, etc. similar to or identical to those of the present invention, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded 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 in sequence from an object plane to an image plane along an optical axis: a first lens, a second lens, and a third lens; it is characterized in that the method comprises the steps of,
the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens is a concave surface, the image plane side is a convex surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive;
and each lens of the optical system satisfies the following condition:
(1)5<f1<10；
(2)-50<f2<-20；
(3)5<f3<10；
(4)0.5<f1/f<2.0；
wherein 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 whole optical system.
2. The infrared large aperture low distortion optical system according to claim 1, wherein the material refractive index Nd1, the material abbe constant Vd1 of the first lens satisfy: 1.80< Nd1<1.95, 20< Vd1<40.
3. The infrared large aperture low distortion optical system according to claim 1, wherein the material refractive index Nd2, the material abbe constant Vd2 of the second lens satisfy: 1.55< Nd2<1.65, 20< Vd2<40.
4. The infrared large aperture low distortion optical system according to claim 1, wherein the material refractive index Nd3, the material abbe constant Vd3 of the third lens satisfy: 1.45< Nd3<1.65, 40< Vd3<60.
5. The infrared large aperture low distortion optical system of claim 1, wherein a stop of the optical system is disposed between the first lens and the second lens.
6. The infrared large aperture low distortion optical system of claim 1, further comprising a narrowband filter disposed between the third lens and the image plane for filtering visible light in the environment to pass infrared light and to 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 sphere lens.
8. The infrared large aperture low distortion optical system of claim 1, wherein the second lens and the third lens are plastic aspheric lenses.
9. An imaging module at least comprising an optical lens, wherein the optical lens is internally provided with the infrared large aperture low distortion optical system as claimed in any one of claims 1 to 8.
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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| CN201710201169.7A Division CN106842519B (en) | 2017-03-30 | 2017-03-30 | Large-aperture low-distortion infrared optical system and camera module applying same |
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| CN114911039A CN114911039A (en) | 2022-08-16 |
| CN114911039B true CN114911039B (en) | 2024-02-27 |
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| CN202210338631.9A Active CN114911039B (en) | 2017-03-30 | 2017-03-30 | Infrared large-aperture low-distortion optical system and camera module applying same |
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| JP2007206611A (en) * | 2006-02-06 | 2007-08-16 | Matsushita Electric Ind Co Ltd | Single focal imaging lens and imaging apparatus having the same |
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| 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 |
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| JP2007155868A (en) * | 2005-12-01 | 2007-06-21 | Sony Corp | Imaging lens and imaging apparatus |
| 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 |
| TWI579583B (en) * | 2015-01-29 | 2017-04-21 | 先進光電科技股份有限公司 | Optical image capturing system |
| 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 CN201710201169.7A patent/CN106842519B/en active Active
- 2017-03-30 CN CN202210338631.9A patent/CN114911039B/en active Active
Patent Citations (5)
| 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 |
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| Publication number | Publication date |
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| CN114911039A (en) | 2022-08-16 |
| CN106842519B (en) | 2022-05-03 |
| CN106842519A (en) | 2017-06-13 |
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