CN110346916B - Rearview optical system and working method thereof - Google Patents
Rearview optical system and working method thereof Download PDFInfo
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- CN110346916B CN110346916B CN201910664199.0A CN201910664199A CN110346916B CN 110346916 B CN110346916 B CN 110346916B CN 201910664199 A CN201910664199 A CN 201910664199A CN 110346916 B CN110346916 B CN 110346916B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005499 meniscus Effects 0.000 claims abstract description 71
- 238000003384 imaging method Methods 0.000 claims description 21
- 239000011521 glass Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 125000005647 linker group Chemical group 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000004075 alteration Effects 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 4
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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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
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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Abstract
The invention relates to a rearview optical system, which is sequentially provided with a front lens group A with negative focal power, a rear lens group B with positive focal power and a fixed diaphragm positioned between the front lens group A and the rear lens group B along the incidence direction of light rays from left to right, wherein the front lens group A comprises a first meniscus negative lens, a second meniscus negative lens and a first biconvex positive lens, and the rear lens group B comprises a third meniscus negative lens and a second biconvex positive lens; the invention also relates to a working method of the rearview optical system. The invention has reasonable structure, simple operation, higher overall reliability of the system, low assembly sensitivity of the lens group, high yield, low optical distortion and high resolution.
Description
Technical Field
The invention relates to a rearview optical system and a working method thereof.
Background
The vehicle-mounted rearview lens has wide application in a vehicle-mounted monitoring system, and provides functions such as rearview images of a vehicle, reversing assistance and the like for a driver. With the development of the automobile industry, higher requirements are put on the performance of the vehicle-mounted rearview mirror. The main problems faced by the rearview mirror on the market at present are: 1. the small aperture causes insufficient edge light flux at a large field angle, so that edge imaging is not clear enough, and imaging quality is poor; 2. common rearview mirror heads generally adopt a 5-6-piece all-glass lens structure, the size of the lens is larger, the weight is heavier, the requirement of miniaturization cannot be met, and the manufacturing cost is higher; 3. the working environment of the vehicle-mounted lens is complex, particularly the working temperature change is large, and the lens is required to ensure the imaging quality in a large working temperature range.
Disclosure of Invention
Therefore, the invention aims to provide a rearview optical system and a working method thereof, which have reasonable structure, simple and convenient operation, higher overall reliability of the system, low assembly sensitivity and high yield of the lens group, low optical distortion and high resolving power.
The technical scheme of the invention is as follows: a rear-view optical system is provided with a front lens group A with negative focal power, a rear lens group B with positive focal power and a fixed diaphragm positioned between the front lens group A and the rear lens group B in sequence from left to right along the incidence direction of light rays, wherein the front lens group A comprises a first meniscus negative lens, a second meniscus negative lens and a first biconvex positive lens, and the rear lens group B comprises a third meniscus negative lens and a second biconvex positive lens.
Further, the third meniscus negative lens and the second biconvex positive lens form an aspherical lens bonding group.
Further, along the incident direction of the light, the air interval between the front lens group A and the rear lens group B is 0.8mm; the air interval between the front lens group A and the fixed diaphragm is 0.3mm; the air space between the fixed diaphragm and the rear lens group B is 0.5mm.
Further, in the front lens group a, an air space between the first negative meniscus lens and the second negative meniscus lens is 0.4mm along the incident direction of the light; the air separation between the second meniscus negative lens and the first biconvex positive lens is 5.5mm.
Further, the first negative meniscus lens and the second negative meniscus lens are spherical lenses and are made of glass materials; the first biconvex positive lens, the third meniscus negative lens and the second biconvex positive lens are aspheric lenses, and are made of plastic materials.
Further, an imaging surface is provided at the rear end of the second biconvex positive lens, and a plate protection glass is provided between the second biconvex positive lens and the imaging surface.
Further, the total focal length of the optical system is set to f, the lens focal length of the first meniscus negative lens is set to f1, the lens focal length of the second meniscus negative lens is set to f2, the lens focal length of the first biconvex positive lens is set to f3, the lens focal length of the third meniscus negative lens is set to f4, the lens focal length of the second biconvex positive lens is set to f5, and the lens focal length relationships are as follows:，。
Further, the refractive index of the first meniscus negative lens is set to N d1, the refractive index of the second meniscus negative lens is set to N d2, the refractive index of the first biconvex positive lens is set to N d3, the refractive index of the third meniscus negative lens is set to N d4, the refractive index of the second biconvex positive lens is set to N d5, and the refractive indexes of the respective lenses satisfy the following relationship: n d1≥1.5;Nd2≥1.5;Nd3≥1.7;Nd4≥1.5;Nd5 is more than or equal to 1.5.
Further, the abbe coefficient of the first meniscus negative lens is set to V d1, the abbe coefficient of the second meniscus negative lens is set to V d2, the abbe coefficient of the first biconvex positive lens is set to V d3, the abbe coefficient of the third meniscus negative lens is set to V d4, the abbe coefficient of the second biconvex positive lens is set to V d5, and the abbe coefficients of the respective lenses satisfy the following relationship: v d1≥45;Vd2≥50;Vd3≤25;Vd4≤25;Vd5 is more than or equal to 50.
The invention provides another technical scheme that a working method of a rearview optical system comprises the following steps: when light is incident, the light path sequentially enters the front lens group A, the fixed diaphragm and the rear lens group B for imaging, when the light passes through the front lens group A, the first meniscus negative lens of the front lens group A has larger refractive index and focal power, the system is ensured to have larger view field, the second meniscus negative lens adopts an aspheric lens and is responsible for correcting the distortion of the whole optical system, and the first biconvex positive lens adopts high-refractive-index ultrahigh-dispersion glass and is used for adjusting the high-low temperature characteristics of the whole optical system; when light passes through the rear lens group B, the third negative meniscus lens with medium refractive index and ultra-high dispersion effectively corrects chromatic aberration and astigmatism of the imaging system.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention adopts the 2G3P design structure, and has smaller body shape and quality compared with the whole glass design; the system has higher overall reliability, low assembly sensitivity of the lens group, high yield and larger cost advantage, and is beneficial to mass production;
(2) The aperture is larger, the edge light inlet quantity is ensured, and the edge imaging quality is improved; by reasonably distributing the reasonable focal power of the glass lens and the plastic aspheric lens, the aspheric lens surface is optimally designed, so that the high-grade aberration and chromatic aberration of the whole optical system are effectively corrected, and meanwhile, the optical distortion of the system is low and the resolution is high;
(3) The lens has good high-low temperature characteristics, and on the premise of the lens combination and the material combination provided by the invention, the optimal resolution imaging position of the lens is unchanged within the temperature range of minus 40 ℃ to +85 ℃.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings.
Drawings
FIG. 1 is a schematic view of an optical structure of an embodiment of the present invention;
FIG. 2 is a graph of the visible MTF of an embodiment of the present invention;
FIG. 3 is a graph of defocus at low temperature of-40℃for an embodiment of the present invention;
FIG. 4 is a graph of defocus at high temperature +85℃accordingto an embodiment of the present invention;
FIG. 5 is a graph of optical distortion for an embodiment of the present invention;
In the figure: 100-front lens group a; 110-a first meniscus negative lens 120-a second meniscus negative lens; 130-a first biconvex positive lens; 200-rear mirror group B; 210-a third meniscus negative lens; 220-a second biconvex positive lens; 300-fixing a diaphragm; 400-imaging plane; 500-plate protection glass.
Detailed Description
As shown in fig. 1 to 5, a front lens group a with negative focal power, a rear lens group B with positive focal power and a fixed diaphragm positioned between the front lens group a and the rear lens group B are sequentially arranged from left to right along the light incidence direction, wherein the front lens group a comprises a first meniscus negative lens, a second meniscus negative lens and a first biconvex positive lens, and the rear lens group B comprises a third meniscus negative lens and a second biconvex positive lens. The negative focal power of the front lens group A can correct the positive focal power aberration of the rear lens group B.
In this embodiment, the third meniscus negative lens and the second biconvex positive lens form an aspherical lens cemented group.
In this embodiment, along the light incident direction, the air space between the front lens group a and the rear lens group B is 0.8mm; the air interval between the front lens group A and the fixed diaphragm is 0.3mm; the air space between the fixed diaphragm and the rear lens group B is 0.5mm.
In this embodiment, in the front lens group a, an air space between the first negative meniscus lens and the second negative meniscus lens is 0.4mm along the incident direction of the light; the air separation between the second meniscus negative lens and the first biconvex positive lens is 5.5mm.
In this embodiment, the first negative meniscus lens and the second negative meniscus lens are spherical lenses, and are made of glass materials; the first biconvex positive lens, the third meniscus negative lens and the second biconvex positive lens are aspheric lenses, and are made of plastic materials.
In this embodiment, an imaging surface is provided at the rear end of the second biconvex positive lens, and a flat protection glass is provided between the second biconvex positive lens and the imaging surface.
In this embodiment, the total focal length of the optical system is set to f, the lens focal length of the first meniscus negative lens is set to f1, the lens focal length of the second meniscus negative lens is set to f2, the lens focal length of the first biconvex positive lens is set to f3, the lens focal length of the third meniscus negative lens is set to f4, the lens focal length of the second biconvex positive lens is set to f5, and the lens focal lengths are as follows:，。
In this embodiment, the refractive index of the first meniscus negative lens is set to Nd1, the refractive index of the second meniscus negative lens is set to Nd2, the refractive index of the first biconvex positive lens is set to Nd3, the refractive index of the third meniscus negative lens is set to Nd4, the refractive index of the second biconvex positive lens is set to Nd5, and the refractive indexes of the respective lenses satisfy the following relationship: nd1 is more than or equal to 1.5; nd2 is more than or equal to 1.5; nd3 is more than or equal to 1.7; nd4 is more than or equal to 1.5; nd5 is more than or equal to 1.5.
In this embodiment, the abbe coefficient of the first meniscus negative lens is set to Vd1, the abbe coefficient of the second meniscus negative lens is set to Vd2, the abbe coefficient of the first biconvex positive lens is set to Vd3, the abbe coefficient of the third meniscus negative lens is set to Vd4, the abbe coefficient of the second biconvex positive lens is set to Vd5, and the abbe coefficients of the respective lenses satisfy the following relationship: vd1 is more than or equal to 45; vd2 is more than or equal to 50; vd3 is less than or equal to 25; vd4 is less than or equal to 25; vd5 is more than or equal to 50.
Table 1, specific lens parameters are as follows
In the embodiment, five lenses are taken as an example, and the focal power, the surface type, the center thickness of each lens, the on-axis air interval between each lens and the like of each lens are reasonably distributed, so that the field angle of the lens is effectively enlarged, the total length of the lens is shortened, and the small distortion and high illumination of the lens are ensured; meanwhile, various aberrations are corrected, and the resolution and imaging quality of the lens are improved. Each aspherical surface profile Z is defined by the following formula:
Wherein, When the height of the aspherical surface is h along the direction of the optical axis, the altitude from the vertex of the aspherical surface is higher; is the paraxial curvature of an aspherical surface, (I.e. paraxial curvature)Is the radius of curvature in Table 1 aboveThe reciprocal of (2); Is a conic constant; A. b, C, D, E are all high order coefficients. Table 2 shows the conic constant k and the higher order coefficient A, B, C, D, E that can be used for each aspherical lens surface in this embodiment.
Table 2 aspherical lens parameters
In this embodiment, the technical indexes of the implementation of the optical system are as follows:
(1) Focal length: EFFL = 1.91mm; (2) aperture f=2.1; (3) angle of view: 2w is more than or equal to 140 degrees; (4) optical distortion: < -33%; (5) imaging circle diameter is greater than phi 4.8; (6) operating band: 420-700 nm; (7) The total optical length TTL is less than or equal to 13.2mm, and the optical back intercept BFL is more than or equal to 2.6mm; (8) the lens is suitable for use in a megapixel CCD or CMOS camera.
A method of operating a rearview optical system comprising the rearview optical system: when light is incident, the light path sequentially enters the front lens group A, the fixed diaphragm and the rear lens group B for imaging, when the light passes through the front lens group A, the first meniscus negative lens of the front lens group A has larger refractive index and focal power, the system is ensured to have larger view field, the second meniscus negative lens adopts an aspheric lens and is responsible for correcting the distortion of the whole optical system, and the first biconvex positive lens adopts high-refractive-index ultrahigh-dispersion glass and is used for adjusting the high-low temperature characteristics of the whole optical system; when light passes through the rear lens group B, the third negative meniscus lens with medium refractive index and ultra-high dispersion effectively corrects chromatic aberration and astigmatism of the imaging system.
In the embodiment of the invention, four aspheric lenses correct all the advanced aberration and spherical aberration, and the balance of the incidence angles of the lenses of the front lens group A and the rear lens group B is ensured through reasonable refractive index and focal power proportion distribution, so that the image surface bending of the optical system is reduced.
The optical system formed by the lenses has short total length of the optical path, so that the lens has small volume and large back focus, and can be matched with cameras with various interfaces for use; the second meniscus negative lens, the third meniscus negative lens and the second biconvex positive lens are plastic aspheric lenses, so that the image quality is good, and the cost is low; the system is designed to have a larger aperture, can ensure the light entering quantity of a large field angle, and has clear edge imaging.
As can be seen from fig. 2, the MTF of the optical system in the visible light band is good, the MTF value of the optical system is greater than 0.5 at the spatial frequency of 45pl/mm, and the MTF value of the optical system is greater than 0.3 at the spatial frequency of 80pl/mm, so that the image force requirement of Gao Qingjie megapixels can be achieved. Fig. 3 and 4 are graphs of MTF defocus curves for the optical system at-40 ℃ and +85 ℃, respectively. As can be seen from the figure, the defocus amount of the central field of view of the optical system was-7.2 μm at-40℃and 6.6 μm at 85 ℃. The defocusing amount is in an acceptable range, and the image quality performance completely meets the use requirement of the vehicle-mounted lens in a high-low temperature environment. Fig. 5 is a graph of optical distortion of the optical system, in which it can be seen that the optical distortion rate of the lens is controlled within-33% at 140 ° of maximum field angle, and the edge imaging is clear and undistorted.
The above operation procedures and software and hardware configurations are only preferred embodiments of the present invention, and are not limited to the scope of the present invention, and all equivalent changes made by the descriptions and the drawings of the present invention, or direct or indirect application in the related technical field, are equally included in the scope of the present invention.
Claims (1)
1. A method of operating a rearview optical system, characterized by: the rearview optical system consists of a front lens group A with negative focal power, a fixed diaphragm and a rear lens group B with positive focal power, which are sequentially arranged from left to right along the incidence direction of light rays, wherein the front lens group A consists of a first meniscus negative lens, a second meniscus negative lens and a first biconvex positive lens, and the rear lens group B consists of a third meniscus negative lens and a second biconvex positive lens;
The third meniscus negative lens and the second biconvex positive lens form an aspheric lens bonding group;
The air interval between the front lens group A and the rear lens group B is 0.8mm along the incidence direction of light rays; the air interval between the front lens group A and the fixed diaphragm is 0.3mm; the air interval between the fixed diaphragm and the rear lens group B is 0.5mm;
in the front lens group A, the air interval between the first negative meniscus lens and the second negative meniscus lens is 0.4mm along the incidence direction of light; the air space between the second meniscus negative lens and the first biconvex positive lens is 5.5mm;
The first meniscus negative lens and the second meniscus negative lens are spherical lenses and are made of glass materials; the first biconvex positive lens, the third meniscus negative lens and the second biconvex positive lens are aspheric lenses and are made of plastic materials;
the refractive index of the first meniscus negative lens is set to N d1, the refractive index of the second meniscus negative lens is set to N d2, the refractive index of the first biconvex positive lens is set to N d3, the refractive index of the third meniscus negative lens is set to N d4, the refractive index of the second biconvex positive lens is set to N d5, and the refractive indexes of the lenses satisfy the following relationship: n d1≥1.5;Nd2≥1.5;Nd3≥1.7;Nd4≥1.5;Nd5 is more than or equal to 1.5;
An imaging surface is arranged at the rear end of the second biconvex positive lens, and a flat protection glass is arranged between the second biconvex positive lens and the imaging surface;
The total focal length of the optical system is set to f, the lens focal length of the first meniscus negative lens is set to f1, the lens focal length of the second meniscus negative lens is set to f2, the lens focal length of the first biconvex positive lens is set to f3, the lens focal length of the third meniscus negative lens is set to f4, the lens focal length of the second biconvex positive lens is set to f5, and the lens focal length relationships are as follows:
；
The abbe coefficient of the first meniscus negative lens is set to V d1, the abbe coefficient of the second meniscus negative lens is set to V d2, the abbe coefficient of the first biconvex positive lens is set to V d3, the abbe coefficient of the third meniscus negative lens is set to V d4, the abbe coefficient of the second biconvex positive lens is set to V d5, and the abbe coefficients of the respective lenses satisfy the following relationship: v d1≥45;Vd2≥50;Vd3≤25;Vd4≤25;Vd5 is more than or equal to 50;
The working method of the rearview optical system comprises the following steps: when light is incident, the light path sequentially enters the front lens group A, the fixed diaphragm and the rear lens group B for imaging.
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| JP2014228570A (en) * | 2013-05-20 | 2014-12-08 | 富士フイルム株式会社 | Wide-angle imaging lens and imaging device |
| CN210742594U (en) * | 2019-07-23 | 2020-06-12 | 福建福光天瞳光学有限公司 | Rear-view optical system |
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| JP2836691B2 (en) * | 1988-09-16 | 1998-12-14 | オリンパス光学工業株式会社 | Zoom lens |
| JPH09311273A (en) * | 1996-05-21 | 1997-12-02 | Konica Corp | Variable focal distance lens |
| JPH11305125A (en) * | 1998-02-19 | 1999-11-05 | Canon Inc | Zoom lens and photographing device using the same |
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| JP2014228570A (en) * | 2013-05-20 | 2014-12-08 | 富士フイルム株式会社 | Wide-angle imaging lens and imaging device |
| CN210742594U (en) * | 2019-07-23 | 2020-06-12 | 福建福光天瞳光学有限公司 | Rear-view optical system |
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