CN110456477A - The low distortion backsight optical system of one kind and imaging method - Google Patents
The low distortion backsight optical system of one kind and imaging method Download PDFInfo
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- CN110456477A CN110456477A CN201910696250.6A CN201910696250A CN110456477A CN 110456477 A CN110456477 A CN 110456477A CN 201910696250 A CN201910696250 A CN 201910696250A CN 110456477 A CN110456477 A CN 110456477A
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- backsight
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- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 238000003384 imaging method Methods 0.000 title claims abstract description 14
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 230000004075 alteration Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—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
- G02B13/0015—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
- G02B13/0045—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 five or more 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
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The present invention relates to a kind of low distortion backsight optical system and imaging methods, including along light input path successively spaced first lens, the second lens, the third lens, diaphragm, the 4th lens and the 5th lens from front to back, first lens and the second lens are bent moon negative lens, the third lens are biconvex positive lens, and the first lens, the second lens and the third lens constitute the preceding group of camera lens that angular is negative；4th lens are biconvex positive lens, and the 5th lens are bent moon negative lens, and the 4th lens and the 5th lens contiguity constitute cemented doublet group and constitute the rear group of camera lens that angular is positive；First lens, the second lens, the 5th lens concave surface towards diaphragm.The configuration of the present invention is simple, rationally, can have a low distortion performance, and use more non-spherical lens when providing larger field angle, achieve the purpose that raising image quality and reduce cost.
Description
Technical field:
The present invention relates to a kind of low distortion backsight optical system and imaging methods.
Background technique:
Wide-angle tight shot is widely applied in vehicle-mounted monitoring system, especially vehicle-mounted rear-viewing system, with automobile
The development of industry, to the performance of wide-angle lens, more stringent requirements are proposed.Common vehicle-mounted backsight wide angle lens on the market now
Mainly face following two problem:
One, common rearview mirror head generally uses the full glass lens structure of 5-6 piece, and camera lens figure is larger, heavier-weight,
It is unable to satisfy the requirement of miniaturization, in manufacturing cost, the manufacturing cost of full Glass Design is higher；
Two, the common backsight angle of view is big, and corresponding edge light passing amount is few, and edge imaging is not clear enough；It is overall at
Image distortion is larger, and image quality is insufficient.
Summary of the invention:
It is an object of the invention to places against the above deficiency, provide the low distortion backsight optical system of one kind and imaging side
Method, it is reasonable in design, there can be low distortion performance when providing larger field angle, reach and improve image quality and reduce cost
Purpose.
To achieve the goals above, the technical solution adopted by the present invention is that: a kind of low distortion backsight optical system, including edge
Light input path successively spaced first lens, the second lens, the third lens, the 4th lens and the 5th from front to back
Lens, first lens and the second lens are bent moon negative lens, and the third lens are biconvex positive lens, the first lens,
Second lens and the third lens constitute the preceding group of camera lens that angular is negative；4th lens are biconvex positive lens, described the
Five lens are bent moon negative lens, and the 4th lens and the 5th lens contiguity constitute cemented doublet group and constitute rear group that angular is positive
Camera lens.
Further, the airspace between first lens and the second lens is 1.4mm, second lens and the
Airspace between three lens is 1.0mm, and the airspace between the third lens and the 4th lens is 0.2mm.
Further, the focal length of the optical system of group camera lens and rear group camera lens composition is f before described, first lens,
Second lens, the third lens, the 4th lens, the 5th lens focal length be respectively f1、f2、f3、f4、f5, wherein f1、f2、f3It is full with f
It is enough lower ratio: -6 < f1< -5 /f, -3 < f2/ f < -2,3 < f3/ f < 4.
Further, the focal length f of the 4th lens, the 5th lens4With f5Meet following ratio: 1.5 < f4/f5< 2.
Further, first lens meet relational expression: Nd>=1.7, Vd≥45；Second lens, which meet, to close
It is formula: Nd>=1.5, Vd≥50；The third lens meet relational expression: Nd>=1.6, Vd≤25；4th lens meet
Relational expression: Nd>=1.5, Vd≥50；5th lens meet relational expression: Nd>=1.6, Vd≤ 25, wherein NdFor refractive index, Vd
For Abbe constant.
Further, first lens are made by spherical lens and by glass material；Second lens, the third lens,
Four lens and the 5th lens are non-spherical lens, and are made of plastic material.
Further, diaphragm, first lens, the second lens, the are equipped between the third lens and the 4th lens
The concave surface of five lens is towards diaphragm.
The another technical solution that the present invention uses is: a kind of imaging method of low distortion backsight optical system, in use
The low distortion backsight optical system stated, when imaging, optical path sequence enters the first lens, the second lens, the third lens, the 4th lens
And the 5th be imaged after lens.
Compared with prior art, the present invention has the effect that
(1) by introducing multi-disc non-spherical lens and one group of aspherical glued microscope group, each mirror surface is reasonably distributed
Focal power effectively corrects system high aberration, color difference；
(2) distortion for enabling non-spherical lens to efficiently control entire optical system is designed using reasonable face type；
(3) design structure of 1G4P is used, compared to full Glass Design, not only structure is simpler, has smaller body
Type and quality, and aspherical glued microscope group is added, assembly susceptibility is reduced, so that yield improves, cost is reduced, and is conducive to
Large-scale production；Additionally there is more preferably image quality, reach mega pixel camera shooting level.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of the optical system 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 distortion curve of the embodiment of the present invention；
Fig. 4 is the defocusing curve figure of the embodiment of the present invention.
In figure:
The first lens of A1-；The second lens of A2-；A3- the third lens；The 4th lens of B1-；The 5th lens of B2-；C- diaphragm；D-
Optical filter.
Specific embodiment:
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, a kind of low distortion backsight optical system of the present invention, including from front to back successively along light input path
Spaced first lens A1, the second lens A2, the third lens A3, diaphragm C, the 4th lens B1 and the 5th lens B2, institute
Stating the first lens A1 and the second lens A2 is bent moon negative lens, the third lens A3 be biconvex positive lens, the first lens A1,
Second lens A2 and the third lens A3 constitutes the preceding group of camera lens that angular is negative；The 4th lens B1 is biconvex positive lens,
The 5th lens B2 is bent moon negative lens, and the 4th lens B1 and the 5th lens B2 contiguity constitute cemented doublet group and constitute optic angle
Spend rear group of camera lens being positive；First lens, the second lens, the 5th lens concave surface towards diaphragm.
In the present embodiment, airspace between the first lens A1 and the second lens A2 is 1.41mm, described second
Airspace between lens A2 and the third lens A3 is 0.97mm, the air between the third lens A3 and the 4th lens B1
Between be divided into 0.17mm.
In the present embodiment, the focal length that the optical system of camera lens and rear group camera lens composition is organized before described is f, first lens
A2, the second lens A2, the third lens A3, the 4th lens B1, the 5th lens B2 focal length be respectively f1、f2、f3、f4、f5, wherein
f1、f2、f3Meet following ratio: -6 < f with f1< -5 /f, -3 < f2/ f < -2,3 < f3/ f < 4.
In the present embodiment, the focal length f of the 4th lens B1, the 5th lens B24With f5Meet following ratio: 1.5 < f4/
f5< 2.Carry out reasonable distribution according to the above ratio by the focal power of optical system that is formed to the present invention, each eyeglass relative to
System focal length f is proportional, and the optical system for forming the present invention is closed in the aberration of the wave-length coverage of 420~700nm
The correction and balance of reason.
In the present embodiment, the first lens A1 meets relational expression: Nd>=1.7, Vd≥45；The second lens A2
Meet relational expression: Nd>=1.5, Vd≥50；The third lens A3 meets relational expression: Nd>=1.6, Vd≤25；Described the 4th
Lens B1 meets relational expression: Nd>=1.5, Vd≥50；The 5th lens B2 meets relational expression: Nd>=1.6, Vd≤ 25, wherein
NdFor refractive index, VdFor Abbe constant.
In the present embodiment, the first lens A1 is made by spherical lens and by glass material；Second lens A2, third are saturating
Mirror A3, the 4th lens B1 and the 5th lens B2 are non-spherical lens, and are made of plastic material.
In the present embodiment, the rear side of the 5th lens is equipped with optical filter D.
As table 1 shows the radius of curvature R, thickness d of each lens of optical lens, refractive index N in the present embodimentdAnd Ah
Shellfish number Vd。
Table 1:
The present embodiment uses five lens as an example, passing through each power of lens of reasonable distribution, face type, each lens
Center thickness and each lens between axis on spacing etc., effectively expand the field angle of camera lens, shorten camera lens total length, guarantee
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, Z be it is aspherical along optical axis direction when being highly the position of h, away from aspheric vertex of surface apart from rise；C is
Aspherical paraxial curvature, c=1/R (that is, inverse that paraxial curvature c is upper 1 mean curvature radius R of table)；K is 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.
Table 2:
In the present embodiment, the technical indicator that this optical system is realized is as follows:
(1) focal length: EFFL=1.24mm；(2) aperture F=2.0；(3) field angle: 2w >=140 °；(4) optical distortion: <-
35%；(5) imaging circular diameter is greater than φ 4.8；(6) service band: 420~700nm；(7) optics overall length TTL≤12.9mm, light
Learn rear cut-off distance BFL >=2.6mm；(8) camera lens is suitable for mega pixel CCD or cmos camera.
In embodiments of the present invention, the first glass A1 has biggish refractive index and focal power, and it is larger to guarantee that system has
Visual field；Second glass A2 selects suitable face type, effectively corrects the distortion of optical system；The negative power of preceding group of camera lens is rectified
The positive light coke aberration of camera lens is just being organized afterwards, and four non-spherical lenses correct all senior aberrations and spherical aberration, and entire camera lens guarantees mirror
Head refractive index and the distribution of focal power approximate ratio, the incidence angle size of the eyeglass of the eyeglass of group camera lens and rear group camera lens before guaranteeing
It is harmonious；By introducing one group of gluing non-spherical lens, the color difference and astigmatism of imaging system are corrected, while reducing the quick of camera lens
Perception improves manufacturing feasibility.
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 lens A2, the third lens A3, the 4th lens B1, the 5th lens B2
For plastic aspheric lenes, image quality is good, at low cost；Preceding group of camera lens is negative power, and rear camera lens of organizing is positive light coke, field of view angle
Reach 140 degree, and have lower distortion, image quality is excellent.
As seen from Figure 2, the optical system is good in the MTF performance of visible light wave range, in spatial frequency 120pl/mm
Place, mtf value is greater than 0.5, and at spatial frequency 80pl/mm, mtf value is greater than 0.6, can achieve the resolving power of million high definitions
Demand.It can be seen from Fig. 3 and Fig. 4 camera lens field angle FOV be 140 ° when, camera lens aberration rate control -35% with
It is interior；When spatial frequency is 80pl/mm, the defocus of camera lens is controlled in the range of -0.006mm to 0.006mm, is 0 in defocus
Position, mtf value be greater than 0.7, it can be seen that in the low distortion backsight optical system that the present embodiment is told, with larger field
In the case where angle, lens distortion rate is low, and image planes are clearly undistorted, while camera lens defocus is smaller, and camera lens resolving power is high.
The another technical solution that the present invention uses is: a kind of imaging method of low distortion backsight optical system, in use
The low distortion backsight optical system stated, when imaging, optical path sequence enters the first lens, the second lens, the third lens, the 4th lens
And the 5th be imaged after lens.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (8)
1. a kind of low distortion backsight optical system, it is characterised in that: including along light input path, successively interval is set from front to back
The first lens, the second lens, the third lens, the 4th lens and the 5th lens set, first lens and the second lens are equal
For bent moon negative lens, the third lens are biconvex positive lens, and the first lens, the second lens and the third lens constitute angular
Preceding group of camera lens being negative；4th lens are biconvex positive lens, and the 5th lens are bent moon negative lens, the 4th lens and the
Five lens contiguity constitutes cemented doublet group and constitutes the rear group of camera lens that angular is positive.
2. the low distortion backsight optical system of one kind according to claim 1, it is characterised in that: first lens and second
Airspace between lens is 1.4mm, and the airspace between second lens and the third lens is 1.0mm, described the
Airspace between three lens and the 4th lens is 0.2mm.
3. the low distortion backsight optical system of one kind according to claim 1, it is characterised in that: the preceding group of camera lens with rear group
The focal length of the optical system of camera lens composition is f, first lens, the second lens, the third lens, the 4th lens, the 5th lens
Focal length be respectively f1、f2、f3、f4、f5, wherein f1、f2、f3Meet following ratio: -6 < f with f1< -5 /f, -3 < f2/ f <-
2,3 < f3/ f < 4.
4. the low distortion backsight optical system of one kind according to claim 3, it is characterised in that: the 4th lens, the 5th
The focal length f of lens4With f5Meet following ratio: 1.5 < f4/f5< 2.
5. the low distortion backsight optical system of one kind according to claim 1, it is characterised in that: first lens meet
Relational expression: Nd>=1.7, Vd≥45；Second lens meet relational expression: Nd>=1.5, Vd≥50；The third lens are full
Sufficient relational expression: Nd>=1.6, Vd≤25；4th lens meet relational expression: Nd>=1.5, Vd≥50；5th lens
Meet relational expression: Nd>=1.6, Vd≤ 25, wherein NdFor refractive index, VdFor Abbe constant.
6. the low distortion backsight optical system of one kind according to claim 1, it is characterised in that: first lens are spherical surface
It lens and is made of glass material；Second lens, the third lens, the 4th lens and the 5th lens are non-spherical lens, and
It is made of plastic material.
7. the low distortion backsight optical system of one kind according to claim 1, it is characterised in that: the third lens and the 4th
Between lens be equipped with diaphragm, first lens, the second lens, the 5th lens concave surface towards diaphragm.
8. a kind of imaging method of low distortion backsight optical system, it is characterised in that: including any using such as claim 1~7
Low distortion backsight optical system described in one, when imaging, optical path sequence enters the first lens, the second lens, the third lens, the
It is imaged after four lens and the 5th lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910696250.6A CN110456477B (en) | 2019-07-30 | 2019-07-30 | Low-distortion rearview optical system and imaging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910696250.6A CN110456477B (en) | 2019-07-30 | 2019-07-30 | Low-distortion rearview optical system and imaging method |
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Cited By (5)
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| CN110806633A (en) * | 2019-11-26 | 2020-02-18 | 福建福光天瞳光学有限公司 | 1.4mm wide-angle optical system and imaging method thereof |
| CN113031212A (en) * | 2020-12-29 | 2021-06-25 | 福建福光天瞳光学有限公司 | 4K pixel automobile data recorder optical system and imaging method thereof |
| CN114637097A (en) * | 2021-09-15 | 2022-06-17 | 宁波永新光学股份有限公司 | Clear on-vehicle optical imaging lens of superelevation |
| CN115453719A (en) * | 2022-09-22 | 2022-12-09 | 福建福光天瞳光学有限公司 | Ultra-clear large-aperture small optical lens and working method thereof |
| CN116482844A (en) * | 2023-02-08 | 2023-07-25 | 广州长步道光学科技有限公司 | High-resolution large-target-area-surface-area-magnetic-fiber telecentric lens |
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| CN115453719A (en) * | 2022-09-22 | 2022-12-09 | 福建福光天瞳光学有限公司 | Ultra-clear large-aperture small optical lens and working method thereof |
| CN116482844A (en) * | 2023-02-08 | 2023-07-25 | 广州长步道光学科技有限公司 | High-resolution large-target-area-surface-area-magnetic-fiber telecentric lens |
| CN116482844B (en) * | 2023-02-08 | 2024-01-09 | 广州长步道光学科技有限公司 | High-resolution large-target-area-surface-area-magnetic-fiber telecentric lens |
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| CN110456477B (en) | 2024-07-05 |
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