CN110346916A - A kind of backsight optical system and its working method - Google Patents
A kind of backsight optical system and its working method Download PDFInfo
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- CN110346916A CN110346916A CN201910664199.0A CN201910664199A CN110346916A CN 110346916 A CN110346916 A CN 110346916A CN 201910664199 A CN201910664199 A CN 201910664199A CN 110346916 A CN110346916 A CN 110346916A
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- lens
- bent moon
- optical system
- moon negative
- negative lens
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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
- G02B13/001—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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The present invention relates to a kind of backsight optical systems, it is disposed with front lens group A, the rear microscope group B that focal power is positive and the fixed aperture between front lens group A and rear microscope group B that focal power is negative from left to right along light incident direction, the front lens group A includes the first bent moon negative lens, the second bent moon negative lens and the first biconvex positive lens, and the rear microscope group B includes third bent moon negative lens and the second biconvex positive lens；The invention further relates to a kind of working methods of backsight optical system.Structure of the invention is reasonable, easy to operate, and system global reliability is higher, and the assembly susceptibility of microscope group is low, yield is high, while optical distortion is low, and resolving power is high.
Description
Technical field
The present invention relates to a kind of backsight optical system and its working methods.
Background technique
Vehicle-mounted back vision camera lens has a wide range of applications in vehicle-mounted monitoring system, provides such as automotive rear-view shadow for driver
The functions such as picture, reversing auxiliary.With the development of automobile industry, to the performance of vehicle-mounted back vision camera lens, more stringent requirements are proposed.It is existing
The main problems faced of backsight camera lens in the market has: the smaller edge for leading to big field angle of 1. apertures leads to deficiency in light quantity, because
This edge imaging is not clear enough, and image quality is poor；2. common rearview mirror head generally uses the full glass lens structure of 5-6 piece,
Camera lens figure is larger, heavier-weight, is unable to satisfy the requirement of miniaturization, and manufacturing cost is higher；3. on-vehicle lens working environment is multiple
Miscellaneous, especially temperature change is larger, it is desirable that camera lens can guarantee image quality in biggish operating temperature range.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of backsight optical system and its working method, structurally reasonable,
Easy to operate, system global reliability is higher, and the assembly susceptibility of microscope group is low, yield is high, while optical distortion is low, resolving power
It is high.
The technical scheme is that a kind of backsight optical system, is disposed with from left to right along light incident direction
Front lens group A, the rear microscope group B that focal power is positive and the fixed aperture between front lens group A and rear microscope group B that focal power is negative,
The front lens group A includes the first bent moon negative lens, the second bent moon negative lens and the first biconvex positive lens, and the rear microscope group B includes
Third bent moon negative lens and the second biconvex positive lens.
Further, third bent moon negative lens and the second biconvex positive lens form non-spherical lens gluing unit.
Further, the airspace between light incident direction, the front lens group A and rear microscope group B is 0.8mm；Before
Airspace between microscope group A and fixed aperture is 0.3mm；Airspace between fixed aperture and rear microscope group B is 0.5mm.
Further, along light incident direction, the front lens group A, the first bent moon negative lens and the second bent moon negative lens
Between airspace be 0.4mm；Airspace between second bent moon negative lens and the first biconvex positive lens is 5.5mm.
Further, the first bent moon negative lens, the second bent moon negative lens are spherical lens, are made of glass material；The
One biconvex positive lens, third bent moon negative lens and the second biconvex positive lens are non-spherical lens, are made of plastic material.
Further, the second biconvex positive lens rear end is provided with imaging surface, the second biconvex positive lens and imaging surface it
Between be provided with plate protection glass.
Further, the total focal length of optical system is set as f, the eyeglass focal length of the first bent moon negative lens is set as
The eyeglass focal length of second bent moon negative lens is set as f2, the eyeglass focal length of the first biconvex positive lens is set as f3 by f1, by
The eyeglass focal length of three bent moon negative lenses is set as f4, and the eyeglass focal length of the second biconvex positive lens is set as f5, each eyeglass focal length
Relationship is as follows:,。
Further, the refractive index of the first bent moon negative lens is set as Nd1, the refractive index of the second bent moon negative lens is set
It is set to Nd2, the refractive index of the first biconvex positive lens is set as Nd3, the refractive index of third bent moon negative lens is set as Nd4, will
The refractive index of second biconvex positive lens is set as Nd5, the refractive index of each eyeglass meets relationship: Nd1≥1.5；Nd2≥1.5；Nd3
≥1.7；Nd4≥1.5；Nd5≥1.5。
Further, the Abbe number of the first bent moon negative lens is set as Vd1, by the Abbe system of the second bent moon negative lens
Number is set as Vd2, the Abbe number of the first biconvex positive lens is set as Vd3, third bent moon negative lens Abbe number is set as
Vd4, the Abbe number of the second biconvex positive lens is set as Vd5, the Abbe number of each eyeglass meets relationship: Vd1≥45；Vd2
≥50；Vd3≤25；Vd4≤25；Vd5≥50。
Another technical solution provided by the invention is a kind of working method of backsight optical system, after described
Optometry system: when light incidence, optical path sequence is imaged after entering front lens group A, fixed aperture and rear microscope group B, when
When light passes through front lens group A, the first bent moon negative lens of front lens group A has biggish refractive index and focal power, guarantees system tool
There is larger field, the second bent moon negative lens uses non-spherical lens, is responsible for the distortion of the entire optical system of correction, the first biconvex is just
Lens use the glass of high refractive index superelevation dispersion, for adjusting the property at high and low temperature of entire optical system；After light warp
When microscope group B, the third bent moon negative lens with medium refractive index and superelevation dispersion effectively corrects the color difference and astigmatism of imaging system.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention uses the design structure of 2G3P, compared to full Glass Design, has smaller figure and quality；System is whole
Body reliability is higher, and the assembly susceptibility of microscope group is low, yield is high, has biggish cost advantage, is conducive to be mass produced；
(2) clear aperture is larger, ensure that edge light-inletting quantity, edge imaging Quality advance；By reasonable distribution glass lens with
The reasonable focal power of plastic aspheric lenes, optimization design non-spherical lens face type, effectively corrects the advanced of entire optical system
The optical distortion of aberration, color difference, simultaneity factor is low, and resolving power is high；
(3) present invention has good property at high and low temperature, in the premise according to lens combination proposed by the invention, combination of materials
Under, camera lens of the invention ensure that the optimum resolution imaging position of -40 DEG C ~+85 DEG C temperature range inner lens is constant.
To can be more clearly understood the above objects, features and advantages of the present invention, with reference to the accompanying drawing to the present invention
Specific embodiment elaborate.
Detailed description of the invention
Fig. 1 is the optical texture schematic diagram of the embodiment of the present invention；
Fig. 2 is the visible light MTF curve figure of the embodiment of the present invention；
Fig. 3 is the defocusing curve figure at -40 DEG C of low temperature of the embodiment of the present invention；
Fig. 4 is the defocusing curve figure at+85 DEG C of high temperature of the embodiment of the present invention；
Fig. 5 is the optical distortion curve graph of the embodiment of the present invention；
In figure: 100- front lens group A；110- the first bent moon negative lens 120- the second bent moon negative lens；The first biconvex positive lens of 130-；
Microscope group B after 200-；210- third bent moon negative lens；The second biconvex positive lens of 220-；300- fixed aperture；400- imaging surface；
500- plate protects glass.
Specific embodiment
As shown in Fig. 1 ~ 5, a kind of backsight optical system, being disposed with focal power from left to right along light incident direction is
Negative front lens group A, the rear microscope group B that focal power is positive and the fixed aperture between front lens group A and rear microscope group B, the preceding mirror
Group A includes the first bent moon negative lens, the second bent moon negative lens and the first biconvex positive lens, and the rear microscope group B includes third bent moon
Negative lens and the second biconvex positive lens.The positive light coke aberration of microscope group B after the negative power of front lens group A can correct.
In the present embodiment, third bent moon negative lens and the second biconvex positive lens form non-spherical lens gluing unit.
In the present embodiment, along light incident direction, the airspace between the front lens group A and rear microscope group B is 0.8mm；
Airspace between front lens group A and fixed aperture is 0.3mm；Airspace between fixed aperture and rear microscope group B is
0.5mm。
In the present embodiment, along light incident direction, in the front lens group A, the first bent moon negative lens and the second bent moon are negative saturating
Airspace between mirror is 0.4mm；Airspace between second bent moon negative lens and the first biconvex positive lens is 5.5mm.
In the present embodiment, the first bent moon negative lens, the second bent moon negative lens are spherical lens, are made of glass material；
First biconvex positive lens, third bent moon negative lens and the second biconvex positive lens are non-spherical lens, are made of plastic material.
In the present embodiment, the second biconvex positive lens rear end is provided with imaging surface, in the second biconvex positive lens and imaging surface
Between be provided with plate protection glass.
In the present embodiment, the total focal length of optical system is set as f, the eyeglass focal length of the first bent moon negative lens is set as
The eyeglass focal length of second bent moon negative lens is set as f2, the eyeglass focal length of the first biconvex positive lens is set as f3 by f1, by
The eyeglass focal length of three bent moon negative lenses is set as f4, and the eyeglass focal length of the second biconvex positive lens is set as f5, each eyeglass focal length
Relationship is as follows:,。
In the present embodiment, the refractive index of the first bent moon negative lens is set as Nd1, by the refractive index of the second bent moon negative lens
It is set as Nd2, the refractive index of the first biconvex positive lens is set as Nd3, the refractive index of third bent moon negative lens is set as
The refractive index of second biconvex positive lens is set as Nd5 by Nd4, and the refractive index of each eyeglass meets relationship: Nd1 >=1.5；Nd2
≥1.5；Nd3≥1.7；Nd4≥1.5；Nd5≥1.5.
In the present embodiment, the Abbe number of the first bent moon negative lens is set as Vd1, by the Abbe of the second bent moon negative lens
Coefficient is set as Vd2, and the Abbe number of the first biconvex positive lens is set as Vd3, and third bent moon negative lens Abbe number is set
It is set to Vd4, the Abbe number of the second biconvex positive lens is set as Vd5, the Abbe number of each eyeglass meets relationship: Vd1
≥45；Vd2≥50；Vd3≤25；Vd4≤25；Vd5≥50.
Table 1, specific lens parameters such as following table
The present embodiment uses five lens as an example, by each power of lens of reasonable distribution, face type, each lens
Airspace etc. on axis between heart thickness and each lens effectively expands the field angle of camera lens, shortens camera lens total length, guarantees
The small distortion of camera lens and high illumination；All kinds of aberrations are corrected simultaneously, improve the resolution and image quality of camera lens.Each aspherical face type
Z is limited by following formula:
Wherein,For it is aspherical along optical axis direction when being highly the position of h, away from aspheric vertex of surface from rise；For aspheric
The paraxial curvature in face,(that is, paraxial curvatureFor upper 1 mean curvature radius of tableInverse)；For the constant of the cone；A,
B, C, D, E are high-order coefficient.Table 2 show the constant of the cone k of available aspherical lens surface each in this present embodiment with
And high-order coefficient A, B, C, D, E.
Each non-spherical lens parameter of table 2
In the present embodiment, the technical indicator that this optical system is realized is as follows:
(1) focal length: EFFL=1.91mm；(2) aperture F=2.1；(3) field angle: 2w >=140 °；(4) optical distortion: < -33%；
(5) imaging circular diameter is greater than φ 4.8；(6) service band: 420~700nm；(7) optics overall length TTL≤13.2mm is cut after optics
Away from BFL >=2.6mm；(8) camera lens is suitable for mega pixel CCD or cmos camera.
A kind of working method of backsight optical system, including the backsight optical system: when light incidence, optical path is suitable
Sequence is imaged after entering front lens group A, fixed aperture and rear microscope group B, when light passes through front lens group A, the first of front lens group A
Bent moon negative lens has biggish refractive index and focal power, guarantees that system has larger field, the second bent moon negative lens is using non-
Spherical lens is responsible for the distortion of the entire optical system of correction, and the first biconvex positive lens use the glass of high refractive index superelevation dispersion,
For adjusting the property at high and low temperature of entire optical system；After light warp when microscope group B, there is medium refractive index and superelevation dispersion
Third bent moon negative lens effectively correct the color difference and astigmatism of imaging system.
In embodiments of the present invention, four non-spherical lenses correct all senior aberrations and spherical aberration, by reasonably reflecting
Rate and focal power pro rate guarantee the harmony of the incidence angle size of the eyeglass of front lens group A and the eyeglass of rear microscope group B, reduce
The curvature of the image of optical system.
The optical system being made up of the above eyeglass, total length of light path is shorter, then camera lens is small in size, rear burnt big, Ke Yiyu
The video camera of a variety of distinct interfaces is used cooperatively；Wherein the second bent moon negative lens, third bent moon negative lens and the second biconvex are just saturating
Mirror is plastic aspheric lenes, and image quality is good, at low cost；System design aperture is larger, can guarantee the light-inletting quantity of big field angle, edge
Imaging clearly.
As seen from Figure 2, the optical system is good in the MTF performance of visible light wave range, in spatial frequency 45pl/mm
Place, mtf value is greater than 0.5, and at spatial frequency 80pl/mm, mtf value is greater than 0.3, can achieve the high removing summer-heat of mega pixel
Image force demand.Fig. 3 and Fig. 4 is the MTF defocusing curve figure at -40 DEG C and+85 DEG C respectively of the optical system.By that can be seen in figure
Out, for the optical system at -40 DEG C, the defocusing amount of central vision is -7.2 μm, and at 85 DEG C, the defocusing amount of central vision is
6.6μm.For defocusing amount in tolerance interval, image quality performance fully meets requirement of the on-vehicle lens under high and low temperature environment.
Fig. 5 is the optical distortion curve graph of the optical system, and camera lens is at 140 ° of maximum field of view angle as can be seen from Figure, optical distortion
Rate controls within -33%, and edge imaging is clear and undistorted.
Aforesaid operations process and software and hardware configuration are only used as presently preferred embodiments of the present invention, are not intended to limit the present invention
The scope of the patents, it is all using equivalents made by description of the invention and accompanying drawing content, be applied directly or indirectly in phase
Technical field is closed, is included within the scope of the present invention.
Claims (10)
1. a kind of backsight optical system, it is characterised in that: be disposed with focal power from left to right along light incident direction and be negative
Front lens group A, the rear microscope group B that focal power is positive and the fixed aperture between front lens group A and rear microscope group B, the front lens group A
Including the first bent moon negative lens, the second bent moon negative lens and the first biconvex positive lens, the rear microscope group B includes that third bent moon is negative saturating
Mirror and the second biconvex positive lens.
2. backsight optical system according to claim 1, it is characterised in that: third bent moon negative lens and the second biconvex are just saturating
Microscope group is at non-spherical lens gluing unit.
3. backsight optical system according to claim 2, it is characterised in that: along light incident direction, the front lens group A with
The airspace between microscope group B is 0.8mm afterwards；Airspace between front lens group A and fixed aperture is 0.3mm；Fixed aperture
Airspace between rear microscope group B is 0.5mm.
4. backsight optical system according to claim 3, it is characterised in that: along light incident direction, the front lens group A
In, the airspace between the first bent moon negative lens and the second bent moon negative lens is 0.4mm；Second bent moon negative lens and first pair
Airspace between convex positive lens is 5.5mm.
5. backsight optical system according to claim 4, it is characterised in that: the first bent moon negative lens, the second bent moon are negative saturating
Mirror is spherical lens, is made of glass material；First biconvex positive lens, third bent moon negative lens and the second biconvex positive lens are
Non-spherical lens is made of plastic material.
6. backsight optical system according to claim 5, it is characterised in that: be provided with into the second biconvex positive lens rear end
Image planes are provided with plate protection glass between the second biconvex positive lens and imaging surface.
7. backsight optical system according to claim 6, it is characterised in that: the total focal length of optical system is set as f, it will
The eyeglass focal length of first bent moon negative lens is set as f1, the eyeglass focal length of the second bent moon negative lens is set as f2, by first pair
The eyeglass focal length of convex positive lens is set as f3, and the eyeglass focal length of third bent moon negative lens is set as f4, and the second biconvex is just saturating
The eyeglass focal length of mirror is set as f5, and each eyeglass focal length relationship is as follows:,。
8. backsight optical system according to claim 7, it is characterised in that: set the refractive index of the first bent moon negative lens
For Nd1, the refractive index of the second bent moon negative lens is set as Nd2, the refractive index of the first biconvex positive lens is set as Nd3, by
The refractive index of three bent moon negative lenses is set as Nd4, the refractive index of the second biconvex positive lens is set as Nd5, the refractive index of each eyeglass
Meet relationship: Nd1≥1.5；Nd2≥1.5；Nd3≥1.7；Nd4≥1.5；Nd5≥1.5。
9. backsight optical system according to claim 8, it is characterised in that: set the Abbe number of the first bent moon negative lens
It is set to Vd1, the Abbe number of the second bent moon negative lens is set as Vd2, the Abbe number of the first biconvex positive lens is set as
Vd3, third bent moon negative lens Abbe number is set as Vd4, the Abbe number of the second biconvex positive lens is set as Vd5, each mirror
The Abbe number of piece meets relationship: Vd1≥45；Vd2≥50；Vd3≤25；Vd4≤25；Vd5≥50。
10. a kind of working method of backsight optical system, including backsight optical system as claimed in claim 9, feature exist
In: when light incidence, optical path sequence is imaged after entering front lens group A, fixed aperture and rear microscope group B, when light passes through
When front lens group A, the first bent moon negative lens of front lens group A has biggish refractive index and focal power, guarantees that system has larger view
, the second bent moon negative lens uses non-spherical lens, is responsible for the distortion of the entire optical system of correction, and the first biconvex positive lens use
The glass of high refractive index superelevation dispersion, for adjusting the property at high and low temperature of entire optical system；After light warp when microscope group B,
Third bent moon negative lens with medium refractive index and superelevation dispersion effectively corrects the color difference and astigmatism of imaging system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910664199.0A CN110346916A (en) | 2019-07-23 | 2019-07-23 | A kind of backsight optical system and its working method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910664199.0A CN110346916A (en) | 2019-07-23 | 2019-07-23 | A kind of backsight optical system and its working method |
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| CN110346916A true CN110346916A (en) | 2019-10-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589479A (en) * | 2021-07-13 | 2021-11-02 | 浙江大华技术股份有限公司 | Imaging system |
| CN113960749A (en) * | 2021-09-24 | 2022-01-21 | 浙江华诺康科技有限公司 | Optical lens and imaging device |
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| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0279013A (en) * | 1988-09-16 | 1990-03-19 | Olympus Optical Co Ltd | 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 |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589479A (en) * | 2021-07-13 | 2021-11-02 | 浙江大华技术股份有限公司 | Imaging system |
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| CN113960749A (en) * | 2021-09-24 | 2022-01-21 | 浙江华诺康科技有限公司 | Optical lens and imaging device |
| CN113960749B (en) * | 2021-09-24 | 2024-01-30 | 浙江华诺康科技有限公司 | Optical lens and imaging device |
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