CN105652421B - A kind of camera lens for digital projector - Google Patents
A kind of camera lens for digital projector Download PDFInfo
- Publication number
- CN105652421B CN105652421B CN201610202317.2A CN201610202317A CN105652421B CN 105652421 B CN105652421 B CN 105652421B CN 201610202317 A CN201610202317 A CN 201610202317A CN 105652421 B CN105652421 B CN 105652421B
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- China
- Prior art keywords
- lens
- airspace
- positive
- camera
- digital projector
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
-
- 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
- G02B13/04—Reversed telephoto objectives
-
- 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 invention discloses a kind of camera lens for digital projector, including the first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens and the 9th lens are followed successively by along optical axis from object plane to image planes；Aperture diaphragm is provided between 4th lens and the 5th lens, and aperture diaphragm is close to the 5th lens；To employ telecentric beam path in image space, control CRA matches with illuminator within the specific limits for the invention, reaches that picture contrast is good, the high effect of capacity usage ratio；Aspheric design is employed close to the first lens of screen and the 8th lens, wherein the first lens are aspherical each monochromatic aberration and the distortion for being used to correct the outer visual field of axle, the 8th lens are used to correct each monochromatic aberration on axle.
Description
Technical field
The present invention relates to a kind of camera lens, more particularly to a kind of camera lens for digital projector.
Background technology
With the development of semiconductor technology in recent years, with DLP (Digital Light Processing：At digital light
Reason), LCD (Liquid Crystal Display：Liquid crystal display), LCOS (Liquid Crystal on Silicon：Silicon
Base fluid is brilliant) etc. Projection Display industry based on technology be obtained for and develop rapidly.In these years, DLP projection display techniques rely on
The display of its abundant color, the picture of high-resolution, the image of high brightness and high-contrast is developed rapidly, and it can be realized
Volume is smaller, the lighter product performance of weight, thus DLP (Digital Light Processing：Digital light processing) it is miniature
Projector has also obtained swift and violent development.DLP(Digital Light Processing：Digital light processing) core in technology
Part is mainly using DMD (Digital Micro mirror Device:Digital micro-mirror) image chip, DMD
(Digital Micro mirror Device:Digital micro-mirror) it is that TIX exclusively grasps and developed
Digital picture chip, it is made up of the digital micro-mirror of many matrix arrangements, and miniscule is with image digitization during work
Signal has 10 degree, 12 degree of upset, and the light beam from lighting source is reflected into projection lens by the upset of micro-reflector
Head is imaged on screen.To match DMD (Digital Micro mirror Device:Digital micro-mirror) chip incidence
Angle, improves the uniformity of projection display picture, rational deployment projection device components, and illuminator uses TIR (total more
internal reflection:Total internal reflection) prism, therefore, DLP (Digital Light Processing：At digital light
Reason) system divides telecentric illumination system and non-telecentric illumination system according to different product scheme.This just needs to use and TIR prism
The different types of projection lens matched somebody with somebody.
For LCOS (Liquid Crystal on Silicon：Liquid crystal on silicon) and LCD (Liquid Crystal
Display：Liquid crystal display) projection optical system, they have one it is common the characteristics of be exactly to need telecentric beam illumination imaging
Chip, also just need the projection lens of telecentric beam path in image space matched certainly, so can preferably ensure that illuminance of image plane is equal
Even property.Further, since DLP (Digital Light Processing：Digital light processing), LCOS (Liquid Crystal on
Silicon：Liquid crystal on silicon) or LCD (Liquid Crystal Display：Liquid crystal display) system can use TIR
(total internal reflection:Total internal reflection) or PBS (polarization beam splitter polarization spectros
Prism) prism realizes effective illumination, therefore, projection lens need when matching to retain longer back work distance from,
This considerably increases lens length and the control difficulty of off-axis aberration, its measure is usually to increase eyeglass, typically greater than ten
So as to cause camera lens to become complicated, and when the angle of visual field increases, have obvious distortion and produce.By inquiry it is seen that market
Some upper projector lens generally there are volume it is big, as matter it is not high, field of view angle is small the shortcomings of.
The content of the invention
To solve drawbacks described above existing for prior art, the present invention, which provides one kind, can be applied to 0.47inch
(having for digital micro-mirror chip is high compared with the wide angle micro that long back work distance and telecentric illumination system match by 1080pDMD
Clear projection lens, the camera lens increase the angle of visual field but still realize the effect of uniform-illumination, and edge relative illumination is more than 80%.
The present invention is achieved through the following technical solutions：
A kind of camera lens for digital projector, including it is followed successively by along optical axis from object plane to image planes the first lens, second saturating
Mirror, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens and the 9th lens；
Aperture diaphragm is provided between 4th lens and the 5th lens, and aperture diaphragm is close to the 5th lens；
First lens are positive lens, the second lens are negative lens, the 3rd lens negative lens, the 4th lens are just saturating
Mirror, the 5th lens positive lens, the 6th lens are positive lens, the 7th lens are negative lens, the 8th lens are that positive lens and the 9th are saturating
Mirror is positive lens；
First lens are falcate concavees lens, the second lens are falcate concavees lens, the 3rd lens be biconcave lens,
4th lens biconvex lens, the 5th lens, the 6th lens are planoconvex spotlight, and the 7th lens are concavees lens, the 8th lens are bent moon
Shape concavees lens and the 9th lens are biconvex lens；
6th lens and the 7th lens group are into cemented doublet J1, and cemented doublet J1 cemented surface deviates from aperture light
Door screen；
First lens and the 8th lens are non-spherical lens；Second lens, the 3rd lens, the 4th lens,
5th lens, the 6th lens, the 7th lens and the 9th lens are spherical lens；
First lens, the second lens, the combined focal length of the 3rd lens and the 4th lens are f1-4, the 5th lens, the 6th
Lens, the 7th lens, the combined focal length of the 8th lens and the 9th lens are f5-9；And 0.75<|f1-4/f5-9|<0.95。
Further, the 6th Lens material is crown glass, and the 7th Lens material is flint glass.
Further, first lens and the 8th Lens material are E48R cyclic olefine copolymers.
Further, the airspace between the first lens and the second lens is 0.28mm, the second lens and the 3rd lens
Between airspace be 5.666mm, the airspace between the 3rd lens and the 4th lens is 1.636mm, the 4th lens with
Airspace between aperture diaphragm is 10.175mm, and airspace is 0.1mm between aperture diaphragm light bar and the 5th lens, the
Five lens and the 6th lens and the 7th lens group into airspace between cemented doublet J1 cemented doublet be 5.044mm,
Five lens and the 6th lens and the 7th lens group are into airspace between cemented doublet J1 cemented doublet and the 8th lens
0.104mm, airspace is 0.1mm between the 8th lens and the 9th lens.
Beneficial effect：
1. aspheric design is employed close to the first lens of screen and the 8th lens, wherein the first lens are aspherical use
In each monochromatic aberration of visual field and distortion outside correction axle, the 8th lens are used to correct each monochromatic aberration on axle.
2. employing telecentric beam path in image space, control CRA matches with illuminator within the specific limits, reaches image comparison
Spend, the high effect of capacity usage ratio.
3. the camera lens has high resolution, edge solution picture reaches chip limiting resolution 93, and pixel reaches 2,000,000 superelevation
Clearly.
4. the camera lens small volume and back work distance be from big, optics TTL is less than 4.7cm, and external diameter is less than 24mm, back work distance from
More than 19mm.
5. the camera lens realizes that the angle of visual field is more than 86 degree wide-angle effects but distorts only 2%, and edge is not reduced as matter.
6. the camera lens is increasing the angle of visual field but still realizing the effect of uniform-illumination, edge relative illumination is more than 80%.
Brief description of the drawings
Accompanying drawing 1 is the lens construction schematic diagram for digital projector；
Accompanying drawing 2 is the transfer curve figure of the camera lens for digital projector；
Accompanying drawing 3 is the curvature of field and distortion curve figure of the camera lens for digital projector；
Accompanying drawing 4 is the chromatic longitudiinal aberration curve map of the camera lens for digital projector；
Accompanying drawing 5 is the encircled energy curve map of the camera lens for digital projector；
Reference is as follows：
The lens of L1- first, the lens of L2- second；The lens of L3- the 3rd；The lens of L4- the 4th；The lens of L5- the 5th；L6- the 6th is saturating
Mirror；The lens of L7- the 7th；The lens of L8- the 8th；The lens of L9- the 9th.
Embodiment
In conjunction with accompanying drawing 1 to 5, the present invention is further elaborated：
A kind of camera lens for digital projector, the projection lens take the photograph distance light system schema, the first lens L1 using counter
And the 8th lens L8 lens materials be E48R non-spherical lenses, the first lens L1 is that non-spherical lens is used to correct and regarded outside axle
Each monochromatic aberration of field and distortion, the 8th lens L8 are used to correct each monochromatic aberration on axle.
In order to ensure the realization of wide-angle while realize long back work distance, thus focal power is allocated as follows, the first lens Ll
Combined focal length to the 4th lens L4 is f1-4, the 5th lens L5 to the 9th lens L9 combined focal length is f5-9,The then optical system
System need to meet condition：|0.75<f1-4/f5-9| ＜ 0.95, if | f1-4/f5-9| >=0.95, the system cannot ensure long enough
Back work distance from, if | f1-4/f5-9|≤0.75, then the focal power of negative group can become too much, so as to cause aberration excessive.
By divergent lens to the beam divergence of each visual field after so that the increase of the delivery altitude of light, the advanced picture in aperture
Difference will increase, and the positive lens for then choosing one piece of high-index material of the 4th lens L4 enters line convergence to light beam, on the one hand
Can suitably reduce influences caused by the senior aberration of aperture, while also more can guarantee that the raising of image sensors' uniformity.
In order to not cause the incidence angle of light beam organized after entering excessive, aperture is placed in using the 4th lens L4 of biconvex shape
Near diaphragm so that the incidence angle for the axle outer light beam organized after entrance suitably reduces, so as to reduce the influence of senior aberration；System
The balsaming lens J1 that the 6th lens L6, the 7th lens the L7 combination in group are formed afterwards is within the system due to working in converging beam
In, according to such image relation, it is necessary to which the lens L7 of flint glass the 7th to be placed on to the direction of screen side, the side direction of screen one
Be exactly as direction, with thing be the direction of opposition, so that being unlikely to the radius of cemented surface in the synthesis aberration of the system of correction
It is too small, so as to ensure that the processing technology of lens further improves.
With reference to accompanying drawing 1, projection lens of projector of the present utility model, wherein object lens be by be arranged in same optical axis the
One lens L1, the second lens L2 and the 3rd lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7,
8th lens L8, the 9th lens L9.Wherein the first lens L1 and the 8th L8 is aspherical, and the projection lens uses image planes telecentricity knot
Structure, Tables 1 and 2 are respectively image space telecentricity fixed focus projection lens for the first lens L1 and the 8th L8 aspheric lens parameters；First
Airspace between lens L1 and the second lens L2 is 0.28mm, the airspace between the second lens L2 and the 3rd lens L3
For 5.666mm, the airspace between the 3rd lens L3 and the 4th lens L4 is 1.636mm, the 4th lens L4 and aperture diaphragm
Between airspace be 10.175mm, airspace is 0.1mm between aperture diaphragm light bar and the 5th lens L5, the 5th lens
Airspace is 5.044mm between L5 and the 6th lens L6 and the 7th lens L7 composition cemented doublets J1 cemented doublet, the
It is empty between five lens L5 and the 6th lens L6 and the 7th lens L7 composition cemented doublets J1 cemented doublet and the 8th lens L8
Gas is at intervals of 0.104mm, and airspace is 0.1mm between the 8th lens L8 and the 9th lens L9.
Aspherical formula is as follows：
Table 1 is the lens parameters of the first lens
Table 2 is the lens parameters of the 8th lens
The parameters of the front and rear surfaces of Tables 1 and 2 and aspherical parameter are met into the formula.
The embodiment is preferred embodiment of the invention, but the present invention is not limited to above-mentioned embodiment, not
Away from the present invention substantive content in the case of, those skilled in the art can make it is any it is conspicuously improved, replace
Or modification belongs to protection scope of the present invention.
Claims (4)
1. a kind of camera lens for digital projector, it is characterised in that saturating including being followed successively by first along optical axis from object plane to image planes
Mirror (L1), the second lens (L2), the 3rd lens (L3), the 4th lens (L4), the 5th lens (L5), the 6th lens (L6), the 7th
Lens (L7), the 8th lens (L8) and the 9th lens (L9)；
Aperture diaphragm is provided between 4th lens (L4) and the 5th lens (L5), and aperture diaphragm is close to the 5th lens
(L5)；
First lens (L1) are positive lens, the second lens (L2) are negative lens, the 3rd lens (L3) negative lens, the 4th lens
(L4) be positive lens, the 5th lens (L5) positive lens, the 6th lens (L6) are positive lens, the 7th lens (L7) are negative lens,
Eight lens (L8) are positive lens and the 9th lens (L9) are positive lens；
First lens (L1) are falcate concavees lens, and the second lens (L2) are falcate concavees lens, the 3rd lens (L3) are
Biconcave lens, the 4th lens (L4) biconvex lens, the 5th lens (L5), the 6th lens (L6) are planoconvex spotlight, the 7th lens
(L7) be concavees lens, the 8th lens (L8) are falcate concavees lens and the 9th lens (L9) are biconvex lens；
6th lens (L6) and the 7th lens (L7) composition cemented doublet J1, and cemented doublet J1 cemented surface deviates from aperture
Diaphragm；
First lens (L1) and the 8th lens (L8) are non-spherical lens；Second lens (L2), the 3rd lens
(L3), the 4th lens (L4), the 5th lens (L5), the 6th lens (L6), the 7th lens (L7) and the 9th lens (L9) are ball
Face lens；
First lens (L1), the second lens (L2), the combined focal length of the 3rd lens (L3) and the 4th lens (L4) are f1-4,
5th lens (L5), the 6th lens (L6), the 7th lens (L7), the combined focal length of the 8th lens (L8) and the 9th lens (L9) are
f5-9；And 0.75<|f1-4/f5-9|<0.95。
2. the camera lens according to claim 1 for digital projector, it is characterised in that described 6th lens (L6) lens
Material is crown glass, and the 7th lens (L7) lens material is flint glass.
3. the camera lens according to claim 1 for digital projector, it is characterised in that first lens (L1) and
Eight lens (L8) lens material is E48R cyclic olefine copolymers.
4. the camera lens according to claim 1 for digital projector, it is characterised in that the first lens (L1) and second saturating
Airspace between mirror (L2) is 0.28mm, and the airspace between the second lens (L2) and the 3rd lens (L3) is
5.666mm, the airspace between the 3rd lens (L3) and the 4th lens (L4) are 1.636mm, the 4th lens (L4) and aperture
Airspace between diaphragm is 10.175mm, and airspace is 0.1mm between aperture diaphragm light bar and the 5th lens (L5), the
Airspace between five lens (L5) and the 6th lens (L6) and the 7th lens (L7) composition cemented doublet J1 cemented doublet
For 5.044mm, the 5th lens (L5) and the 6th lens (L6) and the 7th lens (L7) composition cemented doublet J1 cemented doublet
Airspace is 0.104mm between the 8th lens (L8), and airspace is between the 8th lens (L8) and the 9th lens (L9)
0.1mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610202317.2A CN105652421B (en) | 2016-04-01 | 2016-04-01 | A kind of camera lens for digital projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610202317.2A CN105652421B (en) | 2016-04-01 | 2016-04-01 | A kind of camera lens for digital projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105652421A CN105652421A (en) | 2016-06-08 |
| CN105652421B true CN105652421B (en) | 2018-02-27 |
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| CN201610202317.2A Expired - Fee Related CN105652421B (en) | 2016-04-01 | 2016-04-01 | A kind of camera lens for digital projector |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270669B (en) * | 2017-07-17 | 2021-02-26 | 上旸光学股份有限公司 | Telecentric lens system |
| CN108254905B (en) * | 2017-12-20 | 2020-05-29 | 深圳市帅映科技股份有限公司 | Lens of 4K LCOS projection system |
| CN110794550B (en) * | 2018-08-01 | 2022-03-29 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN109491046B (en) * | 2018-11-27 | 2021-03-05 | 南京信息职业技术学院 | Super-large clear aperture lens structure for X-ray machine |
| CN111142321B (en) * | 2020-02-26 | 2021-12-07 | 歌尔股份有限公司 | Optical system and projection apparatus |
| CN111239977B (en) * | 2020-03-16 | 2022-03-22 | 苏州中科全象智能科技有限公司 | Low-distortion industrial projection lens |
| CN113552692B (en) * | 2020-04-23 | 2022-09-23 | 上海微电子装备（集团）股份有限公司 | Imaging optical system and detection device |
| CN111443462B (en) * | 2020-05-18 | 2021-09-21 | 苏州东方克洛托光电技术有限公司 | Projector additional lens |
| CN115480367B (en) * | 2022-08-16 | 2024-03-15 | 福建福光股份有限公司 | One hundred million-pixel large-depth-of-field optical system and imaging method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5919718B2 (en) * | 2011-10-17 | 2016-05-18 | セイコーエプソン株式会社 | Projection zoom lens |
| CN103149668A (en) * | 2011-12-06 | 2013-06-12 | 佛山普立华科技有限公司 | Zoom projection lens |
| CN203337908U (en) * | 2013-07-26 | 2013-12-11 | 秦皇岛视听机械研究所 | Eight-stack nine-patch digital short-focus projection lens infrastructure |
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2016
- 2016-04-01 CN CN201610202317.2A patent/CN105652421B/en not_active Expired - Fee Related
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| CN105652421A (en) | 2016-06-08 |
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