CN109061843A - A kind of starlight grade large aperture day and night confocal optical lens - Google Patents
A kind of starlight grade large aperture day and night confocal optical lens Download PDFInfo
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- CN109061843A CN109061843A CN201811155274.2A CN201811155274A CN109061843A CN 109061843 A CN109061843 A CN 109061843A CN 201811155274 A CN201811155274 A CN 201811155274A CN 109061843 A CN109061843 A CN 109061843A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 239000011521 glass Substances 0.000 claims abstract description 23
- 229920003023 plastic Polymers 0.000 claims abstract description 16
- 239000004033 plastic Substances 0.000 claims abstract description 16
- 239000006185 dispersion Substances 0.000 claims description 10
- 238000009738 saturating Methods 0.000 claims description 4
- 230000005499 meniscus Effects 0.000 claims description 3
- 230000004075 alteration Effects 0.000 abstract description 23
- 239000000463 material Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 11
- 238000012937 correction Methods 0.000 description 7
- 239000000571 coke Substances 0.000 description 4
- 230000004297 night vision Effects 0.000 description 3
- 230000004304 visual acuity Effects 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 241000700608 Sagitta Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- 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
Abstract
The invention discloses a kind of starlight grade large aperture day and night confocal optical lens, belong to optical lens technology field, including the first lens set gradually from object plane to image planes along optical axis, second lens, the third lens, 4th lens, 5th lens and sensitive chip, diaphragm is set between second lens and the third lens, the third lens are glass spherical lens, first lens, second lens, 4th lens and the 5th lens are plastic aspheric lenes, first lens, second lens, the third lens, the focal length of 4th lens and the 5th lens is successively negative, just, just, it is negative, just.The camera lens replaces 5-6 pieces of glass lens using 4 pieces of plastic aspherical elements, at low cost, high resolution, and aberration is small.
Description
Technical field
The invention belongs to optical lens technology field, more particularly, to a kind of starlight grade large aperture day and night confocal optical frames
Head.
Background technique
Intelligent high-definition video camera pixel is high, image definition is high, and transmission mode is flexible, thus traffic surveillance and control system,
Road information monitoring, license plate and recognition of face etc. application are more and more extensive, this, which means that, proposes more optical lens
High requirement.Also constantly optical lens is improved in the prior art, to meet the requirement of intelligent high-definition video camera.Currently,
Although having some starlight grades, large aperture, infrared confocal optics camera lens to occur, there is also more than eyeglass number or under large aperture
Resolution ratio is low, high/low temperature aberration, the problems such as day and night confocal night vision effect is poor.
Chinese patent (notification number CN204989605U) discloses a kind of high-resolution, infrared confocal optical system, belongs to
Image optics field successively includes the first eyeglass, the second eyeglass, third eyeglass, the 4th eyeglass and photosensitive from the object side to the image side
Chip；Diaphragm is equipped between second eyeglass and third eyeglass；It is provided between 4th eyeglass and sensitive chip
Optical filter, first eyeglass and the second eyeglass are glass spherical lens, and the third eyeglass and the 4th eyeglass are plastics
Non-spherical lens.The utility model solve high-resolution, infrared confocal optical system using number of lenses more, big visual angle
In the case of resolution ratio decline and the problem of using material expensive.But the patent uses 2G2P structure, and light passing aperture is conventional
Aperture (F number is 2.0), night vision effect is general.
Chinese patent (publication number CN107422462A) discloses a kind of large aperture ultra high-definition day and night confocal optical system, belongs to
Technical field of optical comprising the first lens for setting gradually from object plane to image planes along optical axis, the second lens, third are saturating
Mirror, the 4th lens, the 5th lens, the 6th lens and sensitive chip, are arranged diaphragm between the third lens and the 4th lens, institute
Stating the first lens, the third lens and the 6th lens is glass spherical lens, and second lens, the 4th lens and the 5th lens are
Plastic aspheric lenes, first lens, the second lens, the third lens, the 4th lens, the 5th lens and the 6th lens coke
Away from be successively negative, it is negative, positive, positive and negative, just.The patent main problem is to use 3G3P structure, expensive.
Summary of the invention
In view of this, in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of starlight grade large apertures to be day and night total to
Burnt optical lens, the camera lens replace 5-6 pieces of glass lens using 4 pieces of plastic aspherical elements, at low cost, high resolution, and aberration is small.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of starlight grade large aperture day and night confocal optical lens, including set gradually from object plane to image planes along optical axis first thoroughly
Mirror, the second lens, the third lens, the 4th lens, the 5th lens and sensitive chip are set between second lens and the third lens
Diaphragm is set, the third lens are glass spherical lens, and the first lens, the second lens, the 4th lens and the 5th lens are plastic cement
Non-spherical lens, first lens, the second lens, the third lens, the 4th lens and the 5th lens focal length be successively negative,
Just, positive and negative, just.
Further, optical filter and protection glass are set gradually between the 5th lens and sensitive chip.
Further, first lens are biconcave lens, and the second lens are positive meniscus shaped lens, and the third lens are biconvex
Lens, the 4th lens are biconcave lens, and the 5th lens are biconvex lens.
Further, first lens are low dispersing lens, meet 50 < Vd < 70；Second lens are that high dispersion is saturating
Mirror meets 17.8 < Vd < 30；The third lens are high-refractivity and low-dispersion lens, meet 1.55,50 < Vd < 70 of Nd >；4th
Lens are high refractive index lens, meet Nd > 1.8；5th lens are low dispersing lens, meet 50 < Vd < 70；Wherein Nd is indicated
The d optical index of eyeglass, Vd indicate the Abbe constant of eyeglass.
Further, the camera lens is large aperture camera lens, FNo.=1.6.
The beneficial effects of the present invention are:
1, the present invention discloses a kind of starlight grade large aperture day and night confocal optical lens, using four pieces of plastic aspherical elements, by non-
The adjustment of spherical surface type and material, so that camera lens pixel reaches 2MP, FNo. 1.6, field angle is 112 degree, and the mirror of the camera lens
Head piece is compressed to 5 pieces.
2, it is defined by the material to the third lens, the 4th lens, while the aspheric of the 4th lens and the 5th lens
The correction of face coefficient is so that the reduction of camera lens spherical aberration, solves the problems, such as spherical aberration and high-order spherical aberration, to reach the effect of large aperture
(FNo. reaches 1.6=unthreaded hole/focal length=5.6mm/4.0mm).
3, in the case of the first lens, the second lens, the 4th lens and the 5th lens use plastic aspherical element bidirectional correcting,
Burnt variable quantity in 400nm ~ 700nm spectral region, not only makes image into 0.005mm after ensuring when daytime and night convert
Color is beautiful and sharp keen, also has good color reducibility, the effect for observing the effect of imaging directly closer to human eye.Together
When, the near infrared spectrum aberration of 800nm ~ 940nm is also corrected, realizes day and night confocal effect.
4, lens focus is 4.0mm in the present invention, replaces 5-6 pieces of glass lens using 4 pieces of plastic aspherical elements, from size essence
Glass lens ratio of precision glass lens want high for degree, and glass lens cost is far below glass lens cost from cost,
Greatly reduce cost of manufacture.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the optical lens of the embodiment of the present invention 1；
Fig. 2 is the spherical aberration curve graph of optical lens in the embodiment of the present invention 1；
Fig. 3 is the curvature of field and distortion curve of optical lens in the embodiment of the present invention 1；
Fig. 4 is the chromatic curve figure of optical lens in the embodiment of the present invention 1；
Fig. 5 is the MTF curve figure of optical lens in the embodiment of the present invention 1.
In figure: the first lens of 1-, the second lens of 2-, 3- the third lens, the 4th lens of 4-, the 5th lens of 5-, 6- filter
Piece, 7- protect glass, 8- sensitive chip, 9- diaphragm.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, the present invention discloses a kind of starlight grade large aperture day and night confocal optical lens, including along optical axis from object plane to
The first lens 1, the second lens 2, the third lens 3, the 4th lens 4, the 5th lens 5 and the sensitive chip 8 that image planes are set gradually, the
Diaphragm 9 is set between two lens 2 and the third lens 3, optical filter 6 and protection are set gradually between the 5th lens 5 and sensitive chip 8
Glass 7, the third lens 3 are glass spherical lens, and the first lens 1, the second lens 2, the 4th lens 4 and the 5th lens 5 are plastic cement
Non-spherical lens, the first lens 1, the second lens 2, the third lens 3, the 4th lens 4 and the 5th lens 5 focal length be successively negative,
Just, positive and negative, just.
In said lens: the first lens 1 are biconcave lens, and the second lens 2 are positive meniscus shaped lens, and the third lens 3 are double
Convex lens, the 4th lens 4 are biconcave lens, and the 5th lens 5 are biconvex lens.
In said lens: the first lens 1 are low dispersing lens, meet 50 < Vd < 70；Second lens 2 are that high dispersion is saturating
Mirror meets 17.8 < Vd < 30；The third lens 3 are high-refractivity and low-dispersion lens, meet 1.55,50 < Vd < 70 of Nd >；The
Four lens 4 are high refractive index lens, meet Nd > 1.8；5th lens 5 are low dispersing lens, meet 50 < Vd < 70；Wherein Nd
Indicate that the d optical index of eyeglass, Vd indicate the Abbe constant of eyeglass.
Above-mentioned first lens, the second lens, the 4th lens and the 5th lens aspherical face type be all satisfied equation:
,
Wherein: c is curvature corresponding to radius, and y is radial coordinate, and the unit of radial coordinate is identical with length of lens unit, and k is
Circular cone whose conic coefficient；
As k < -1, the face shape curve of lens is hyperbola；
As k=- 1, the face shape curve of lens is parabola；
As -1 < k < 0, the face shape curve of lens is ellipse；
As k=0, the face shape curve of lens is circle；
As k > 0, the face shape curve of lens is oblate；
~Respectively indicate coefficient corresponding to each radial coordinate.
The first lens are low dispersion non-spherical lens in the present invention, carry out correcting chromatic aberration using low dispersion, pass through aspherical system
Number emphasis is correcting distorted, by correction so that lens distortion is less than -36%.
Second lens, the adjustment by increasing core thickness and R value are mainly used to correct the curvature of field.
The third lens use high-refractivity and low-dispersion lens, and high refractive index is conducive to the correction of spherical aberration and coma,
Low dispersion is used to correct and inhibit the focus drifting of infrared imaging.Meanwhile this position is placed glass lens and is greatly contributed to
The focus drifting of camera lens when inhibition high and low temperature environment.
4th the 5th lens group is used to further spherical aberration corrector coma color difference and astigmatism, and being can by asphericity coefficient
The residual aberration of fine correction incident ray.
The present invention is defined by the material to the third lens, the 4th lens in the design process, i.e., the third lens make
With high-refractivity and low-dispersion profile matter, while the 4th lens are used to improve image quality using high refractive index material, while passing through the 4th
The correction of the asphericity coefficient of lens and the 5th lens solves the problems, such as spherical aberration and high-order spherical aberration so that camera lens spherical aberration reduces, thus
Reach the effect of large aperture (FNo. reaches 1.6=unthreaded hole/focal length=5.6mm/4.0mm).
Coke changes after making up high/low temperature by optical plastic lens material physical characteristic, realizes " high temperature (+80 DEG C) opportunity
Burnt variable quantity after structure "-" high temperature (+80 DEG C) optic back focal variable quantity " is no more than ± 0.002mm；It is " burnt after low temperature (- 40 DEG C) mechanism
Variable quantity "-" low temperature (- 40 DEG C) optic back focal variable quantity " is no more than ± 0.002 mm；To solve high temperature performance at one stroke
Problem.
In the design process, the first lens, the second lens, the 4th lens and the 5th lens are using plastic aspherical element to can
In the case that light-exposed and near infrared light corrects simultaneously, it is ensured that after when daytime and night converts coke variable quantity into 0.005mm,
In 400nm ~ 700nm spectral region, not only make image color beautiful and sharp keen, also there is good color reducibility, make to be imaged
The effect directly observed closer to human eye of effect.Meanwhile the near infrared spectrum aberration of 800nm ~ 940nm is also corrected, it realizes
Day and night confocal effect.
Under normal circumstances, using glass mirror the piece number at 6-7 pieces, it just can solve camera lens Aberration Problem, making pixel is 2MP,
It FNo. is 1.6, the camera lens that field angle is 112 degree, the application passes through aspherical face type and material by using four pieces of plastic aspherical elements
The adjustment of material, so that camera lens pixel reaches 2MP, FNo. 1.6, field angle is 112 degree, and it is completely not empty that night vision effect reaches center
Coke, and the lens of the camera lens is compressed to 5 pieces.
Since the lens focus is 4.0mm, usage amount is larger in reality production, is now replaced using 4 pieces of plastic aspherical elements
5-6 pieces of glass lens, it is average when plastic mould cost is divided into single component since usage amount is big from cost
About 0.7-1.0 yuans of expense, and about 1.5-2.5 yuans of glass lens average cost is differed, by present camera lens at
This calculating at least saves about 3.5 yuans of cost.
Enumerate a field angle be 112 °, resolution ratio be 2,000,000 pixels, mechanical overall length be 22.5mm within, can be at -40 DEG C
The actual design embodiment worked normally in the environment of ~+80 DEG C:
1 system data of table
2 asphericity coefficient of table~
In above-mentioned Tables 1 and 2:
What face number 1 and 2 respectively indicated is the first face and the second face of the first lens 1, and the material of the first lens 1 is APL5014；
What face number 3 and 4 respectively indicated is the first face and the second face of the second lens 2, and the material of the second lens 2 is EP5000；
What face number 6 and 7 respectively indicated is the first face and the second face of the third lens 3, and the material of the third lens 3 is H-ZF88；
What face number 8 and 9 respectively indicated is the first face and the second face of the 4th lens 4, and the material of the 4th lens 4 is EP5000；
What face number 10 and 11 respectively indicated is the first face and the second face of the 5th lens 5, and the material of the 5th lens 5 is
APL5014；
What face number 12 and 13 respectively indicated is the first face and the second face of optical filter 6, and the substrate material of optical filter 6 is H-K9L；
What face number 14 and 15 respectively indicated is the first face and the second face for protecting glass 7, and the substrate material of protection glass 7 is H-
K9L；
Wherein, first face refers to the one side towards object plane side, and the second face refers to the one side towards image planes.
The performance detection of the camera lens is shown in that attached drawing 2-5, Fig. 2 can be seen that spherical aberration and be remedied within ± 0.04mm, in band
Spherical aberration correction is relatively good in width, can increase the tidiness of camera lens real scene shooting picture in this way.Due to using aspherical lens, in Fig. 3
Astigmatism and the curvature of field can be remedied to suitable range, enable the resolving power of meridian close with the resolving power in sagitta of arc direction.
Chromatic longitudiinal aberration in Fig. 4, f light, d light, c light are with respect to chromatic longitudiinal aberration within 2 μm, and g light chromatic longitudiinal aberration is within 7 μm, chromatic aberration correction
It is preferable, our camera lens solutions can be met as quality requirements；In Fig. 5 MTF curve figure can be seen that central vision and 0.7 visual field with
Interior, the spatial frequency of 200cycles/mm has higher acutance, which has excellent resolving power, high resolution.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (5)
1. a kind of starlight grade large aperture day and night confocal optical lens, it is characterised in that: including along optical axis from object plane to image planes according to
The first lens (1), the second lens (2), the third lens (3), the 4th lens (4), the 5th lens (5) and the sensitive chip of secondary setting
(8), diaphragm (9) are set between second lens (2) and the third lens (3), the third lens (3) are that glass spherical surface is saturating
Mirror, the first lens (1), the second lens (2), the 4th lens (4) and the 5th lens (5) are plastic aspheric lenes, described first
Lens (1), the second lens (2), the third lens (3), the 4th lens (4) and the 5th lens (5) focal length be followed successively by it is negative, positive, just,
It is negative, positive.
2. a kind of starlight grade large aperture according to claim 1 day and night confocal optical lens, it is characterised in that: described
Optical filter (6) and protection glass (7) are set gradually between five lens (5) and sensitive chip (8).
3. a kind of starlight grade large aperture according to claim 1 day and night confocal optical lens, it is characterised in that: described
One lens (1) are biconcave lens, and the second lens (2) are positive meniscus shaped lens, and the third lens (3) are biconvex lens, the 4th lens
It (4) is biconcave lens, the 5th lens (5) are biconvex lens.
4. a kind of starlight grade large aperture according to claim 1 day and night confocal optical lens, it is characterised in that: described
One lens (1) are low dispersing lens, meet 50 < Vd < 70；Second lens (2) are high dispersing lens, meet 17.8 < Vd <
30；The third lens (3) are high-refractivity and low-dispersion lens, meet 1.55,50 < Vd < 70 of Nd >；4th lens (4) are high folding
Rate lens are penetrated, Nd > 1.8 is met；5th lens (5) are low dispersing lens, meet 50 < Vd < 70；Wherein Nd indicates the d of eyeglass
Optical index, Vd indicate the Abbe constant of eyeglass.
5. a kind of starlight grade large aperture according to claim 1 day and night confocal optical lens, it is characterised in that: the mirror
Head is large aperture camera lens, FNo.=1.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155274.2A CN109061843A (en) | 2018-09-30 | 2018-09-30 | A kind of starlight grade large aperture day and night confocal optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811155274.2A CN109061843A (en) | 2018-09-30 | 2018-09-30 | A kind of starlight grade large aperture day and night confocal optical lens |
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| Publication Number | Publication Date |
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| CN109061843A true CN109061843A (en) | 2018-12-21 |
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| CN201811155274.2A Withdrawn CN109061843A (en) | 2018-09-30 | 2018-09-30 | A kind of starlight grade large aperture day and night confocal optical lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933977A (en) * | 2021-11-05 | 2022-01-14 | 河南翊轩光电科技有限公司 | Confocal shimmer camera lens of 4k high definition day night |
-
2018
- 2018-09-30 CN CN201811155274.2A patent/CN109061843A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933977A (en) * | 2021-11-05 | 2022-01-14 | 河南翊轩光电科技有限公司 | Confocal shimmer camera lens of 4k high definition day night |
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Application publication date: 20181221 |
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