CN108761731B - Vehicle-mounted monitoring optical system for preventing fatigue driving and camera module applied by same - Google Patents
Vehicle-mounted monitoring optical system for preventing fatigue driving and camera module applied by same Download PDFInfo
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- CN108761731B CN108761731B CN201810692697.1A CN201810692697A CN108761731B CN 108761731 B CN108761731 B CN 108761731B CN 201810692697 A CN201810692697 A CN 201810692697A CN 108761731 B CN108761731 B CN 108761731B
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The embodiment of the invention discloses a vehicle-mounted monitoring optical system for preventing fatigue driving, which 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, and a fourth 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 negative; the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is positive; the object plane side of the third lens is a convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive; the object plane side of the fourth lens is a concave surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive. On the other hand, the embodiment of the invention also provides a camera module. The optical system and the camera module of the embodiment of the invention mainly comprise 4 lenses, and have the advantages of less lenses, simple structure, small volume, light weight and low cost; different lenses are combined with each other and optical power is reasonably distributed, so that the vehicle-mounted monitoring system has good optical performance and is convenient to use in cooperation with a miniaturized vehicle-mounted monitoring system for preventing fatigue driving.
Description
Technical field:
the invention relates to an optical system and a camera module applied to the optical system, in particular to a vehicle-mounted monitoring optical system for preventing fatigue driving and a camera module applied to the vehicle-mounted monitoring optical system.
The background technology is as follows:
the existing vehicle-mounted monitoring optical system or camera module for preventing fatigue driving has the problems of complex structure, large volume, low pixels, long total length and high cost, and is not beneficial to miniaturization of an early warning system.
The invention comprises the following steps:
in order to solve the problems of complex structure and large volume of the existing vehicle-mounted monitoring optical system or camera module for preventing fatigue driving, the embodiment of the invention provides the vehicle-mounted monitoring optical system for preventing fatigue driving.
An anti-fatigue driving vehicle-mounted monitoring optical system sequentially comprises from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, and a fourth 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 negative;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is positive;
the object plane side of the third lens is a convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a concave surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive.
On the other hand, the embodiment of the invention also provides a camera module.
The camera module at least comprises an optical lens, wherein the vehicle-mounted monitoring optical system for preventing fatigue driving is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 4 lenses, and have the advantages of less lenses, simple structure, small volume, light weight and low cost; different lenses are combined with each other and optical power is reasonably distributed, lens aberration is optimized, aperture is large, resolving power is high, temperature characteristics (-40 ℃ -85 ℃) are excellent, good optical performances such as use of 200 ten thousand pixel chips are met, and the vehicle-mounted monitoring system for fatigue driving is convenient to use in cooperation with the vehicle-mounted monitoring system.
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 optical system or camera module according to the present invention;
FIG. 2 is a graph of MTF of an optical system or camera module of the present invention;
fig. 3 is a defocus graph of the optical system or camera module of the present invention.
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.
When embodiments of the present invention refer to the ordinal terms "first," "second," etc., it is to be understood that they are merely used for distinguishing between them unless the order of their presentation is indeed dependent on the context.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The embodiment of the invention provides a vehicle-mounted monitoring optical system for preventing fatigue driving, as shown in fig. 1, the system sequentially comprises, from an object plane to an image plane 6 along an optical axis: a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4.
The object plane side of the first lens 1 is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is negative;
the object plane side of the second lens 2 is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is positive;
the object plane side of the third lens 3 is a convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive;
the fourth lens element 4 has a concave object-side surface, a convex image-side surface, and a positive optical power.
The optical system of the embodiment of the invention mainly comprises 4 lenses, and has the advantages of less lenses, simple structure, small volume, light weight and low cost; different lenses are combined with each other and optical power is reasonably distributed, lens aberration is optimized, aperture is large, resolving power is high, temperature characteristics (-40 ℃ -85 ℃) are excellent, good optical performances such as use of 200 ten thousand pixel chips are met, and the vehicle-mounted monitoring system for fatigue driving is convenient to use in cooperation with the vehicle-mounted monitoring system.
Further, as a preferred embodiment of the present solution, not by way of limitation, the ratio of the focal length EFL of the lens to the total length TTL of the lens satisfies the following condition: 2< TTL/EFL. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, not limiting, each lens of the optical system satisfies the following condition:
(1)0.93＜∣f1/f∣＜2；
(2)2＜∣f2/f3∣；
(3)4.5＜∣f4/f∣；
wherein f is the focal length of the whole optical system, 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 f4 is the focal length of the fourth lens. Different lenses are combined with each other and optical power is reasonably distributed, lens aberration is optimized, aperture is large, resolving power is high, temperature characteristics (-40 ℃ -85 ℃) are excellent, and good optical performances such as use of 200 ten thousand pixel chips are met.
Further, as a preferred embodiment of the present embodiment, not limited thereto, the refractive index Nd1 of the material of the first lens 1, the abbe constant Vd1 of the material satisfy: 1.48< nd1<1.65, 30< vd1<72; the focal length f1 of the first lens 1 satisfies: 0.93 < |f1/f| <2, f being the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present embodiment, not limiting, the refractive index Nd2 of the material of the second lens 2, the abbe constant Vd2 of the material satisfy: 1.51< Nd2<1.7, 20< Vd2<60; the focal length f2 of the second lens 2 and the focal length f3 of the third lens satisfy: 2< |f2/f3|. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present embodiment, not limited thereto, the refractive index Nd3 of the material of the third lens 3, the abbe constant Vd3 of the material satisfy: 1.8< Nd3<2.1, 18< Vd3<50; the focal length f3 of the third lens 3 and the focal length f2 of the second lens satisfy: 2< |f2/f3|. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present embodiment, not limiting, the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens 4 satisfy: 1.51< Nd4<1.7, 20< Vd4<60; the focal length f4 of the fourth lens 4 satisfies: 4.5 < |f4/f|, f being the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present embodiment, not limiting, the optical total length TTL of the optical system satisfies: 5mm < TTL <10mm. Simple structure, good optical performance, short total length and contribution to miniaturization of the module.
Still further, as a preferred embodiment of the present solution, not limiting, a diaphragm 5 of the optical system is located between the second lens 2 and the third lens 3. The structure is simple, and the device is used for adjusting the intensity of the light beam.
Still further, as a specific embodiment of the present invention, but not limited to, the first lens 1 and the third lens 3 are glass lenses, and the second lens 2 and the fourth lens 4 are plastic aspherical lenses. And the glass-plastic mixed structure is adopted, so that the resolution of the optical system is improved.
Specifically, in the present embodiment, with reference to fig. 1, the focal length f=2.5 mm, the stop index F/no=2.0, the horizontal direction field angle hfov=90°, and the optical total length ttl=7.0 mm of the optical system. 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 | 22.859118 | 0.490000 | 1.516797 | 64.212351 |
| S2 | 1.300803 | 0.290000 | ||
| S3 | 2.681592 | 0.500000 | 1.525120 | 56.281563 |
| S4 | 5.062319 | 0.140000 | ||
| STO | Infinity (infinity) | 0.600000 | ||
| S6 | 11.013614 | 0.800000 | 2.000689 | 25.435062 |
| S7 | -2.573842 | 0.300000 | ||
| S8 | -1.537232 | 0.430000 | 1.525120 | 56.281563 |
| S9 | -1.480294 | 0.300000 | ||
| IMA | Infinity (infinity) |
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; s3 and S4 correspond to two surfaces of the second lens 2; STO is the position of the diaphragm; s6 and S7 correspond to two surfaces of the third lens 3; s8 and S9 correspond to two surfaces of the fourth lens 4; IMA corresponds to the image plane 6.
More specifically, the second lens 2 and the fourth lens 4 are plastic aspherical lenses, which satisfy the following equations:wherein, the parameter c=1/R is the curvature corresponding to the radius, y is the radial coordinate, the unit is the same as the lens length unit, k is the conic coefficient, a 1 To a 5 The coefficients corresponding to the radial coordinates are respectively obtained. The values of the aspherical correlations of the S3 surface and the S4 surface of the second lens 2, the S8 surface and the S9 surface of the fourth lens 4 are shown in the following table:
as can be seen from fig. 2 to 3, the optical system in the present embodiment has a large aperture, high resolving power, excellent temperature characteristics (-40 ℃ -85 ℃), and good optical performance satisfying the use of 200 ten thousand pixel chips.
The camera module at least comprises an optical lens, wherein the vehicle-mounted monitoring optical system for preventing fatigue driving is arranged in the optical lens.
The camera module of the embodiment of the invention mainly comprises 4 lenses, and has the advantages of less lenses, simple structure, small volume, light weight and low cost; different lenses are combined with each other and optical power is reasonably distributed, lens aberration is optimized, aperture is large, resolving power is high, temperature characteristics (-40 ℃ -85 ℃) are excellent, good optical performances such as use of 200 ten thousand pixel chips are met, and the vehicle-mounted monitoring system for fatigue driving is convenient to use in cooperation with the vehicle-mounted monitoring system.
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 (6)
1. The vehicle-mounted monitoring optical system for preventing fatigue driving comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens in sequence from an object plane to an image plane along an optical axis; 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, the focal power of the first lens is negative, the curvature radius of the object plane is 22.859118mm, the thickness of the first lens is 0.49mm, the curvature radius of the image plane is 1.300803mm, the distance from the first lens to the second lens is 0.29mm, and the refractive index Nd1 of the material of the first lens is 1.516797;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, the focal power of the second lens is positive, the curvature radius of the object plane is 2.681592mm, the thickness of the second lens is 0.50mm, the curvature radius of the image plane is 5.062319mm, the distance from the second lens to the diaphragm is 0.14mm, and the refractive index Nd2 of the material of the second lens is 1.525120;
the distance from the diaphragm to the third lens is 0.60mm;
the object plane side of the third lens is a convex surface, the image plane side is a convex surface, the focal power of the third lens is positive, the curvature radius of the object plane is 11.013614mm, the thickness of the third lens is 0.80mm, the curvature radius of the image plane is-2.573842 mm, the distance from the third lens to the fourth lens is 0.30mm, and the material refractive index Nd3 of the third lens is 2.000689;
the object plane side of the fourth lens is a concave surface, the image plane side is a convex surface, the focal power is positive, the curvature radius of the object plane is-1.537232 mm, the thickness of the fourth lens is 0.43mm, the curvature radius of the image plane is-1.480294 mm, and the material refractive index Nd4 of the fourth lens is 1.525120.
2. The vehicle-mounted monitoring optical system for preventing fatigue driving according to claim 1, wherein the abbe constant Vd1 of the material of the first lens satisfies: 30< Vd1<72.
3. The vehicle-mounted monitoring optical system for preventing fatigue driving according to claim 1, wherein the abbe constant Vd2 of the material of the second lens satisfies: 20< Vd2<60.
4. The vehicle-mounted monitoring optical system for preventing fatigue driving according to claim 1, wherein the abbe constant Vd3 of the material of the third lens satisfies: 18< Vd3<50.
5. The vehicle-mounted monitoring optical system for preventing fatigue driving according to claim 1, wherein the abbe constant Vd4 of the material of the fourth lens satisfies: 20< Vd4<60.
6. An imaging module at least comprising an optical lens, wherein the in-vehicle monitoring optical system for preventing fatigue driving according to any one of claims 1-5 is installed in the optical lens.
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| CN201810692697.1A CN108761731B (en) | 2018-06-29 | 2018-06-29 | Vehicle-mounted monitoring optical system for preventing fatigue driving and camera module applied by same |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211000A (en) * | 2006-12-28 | 2008-07-02 | 富士能株式会社 | Telephoto lens |
| CN101276041A (en) * | 2007-03-28 | 2008-10-01 | 柯尼卡美能达精密光学株式会社 | Image pickup lens, image pickup apparatus and mobile terminal |
| KR20160048540A (en) * | 2014-10-24 | 2016-05-04 | 주식회사 코렌 | Photographic lens optical system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387736B (en) * | 2007-09-13 | 2012-05-23 | 鸿富锦精密工业（深圳）有限公司 | Projecting lens |
| JP5929030B2 (en) * | 2011-08-04 | 2016-06-01 | ソニー株式会社 | Imaging lens and imaging apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211000A (en) * | 2006-12-28 | 2008-07-02 | 富士能株式会社 | Telephoto lens |
| CN101276041A (en) * | 2007-03-28 | 2008-10-01 | 柯尼卡美能达精密光学株式会社 | Image pickup lens, image pickup apparatus and mobile terminal |
| KR20160048540A (en) * | 2014-10-24 | 2016-05-04 | 주식회사 코렌 | Photographic lens optical system |
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