CN108227150A - A kind of low distortion Miniature projection lens of high-resolution - Google Patents
A kind of low distortion Miniature projection lens of high-resolution Download PDFInfo
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- CN108227150A CN108227150A CN201810144424.3A CN201810144424A CN108227150A CN 108227150 A CN108227150 A CN 108227150A CN 201810144424 A CN201810144424 A CN 201810144424A CN 108227150 A CN108227150 A CN 108227150A
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- lens
- miniature projection
- microscope group
- low distortion
- projection lens
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- 239000011521 glass Substances 0.000 claims abstract description 8
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- 229910052788 barium Inorganic materials 0.000 claims description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000005331 crown glasses (windows) Substances 0.000 claims description 3
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- 239000005308 flint glass Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000009885 systemic effect Effects 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 description 11
- 230000004075 alteration Effects 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000003384 imaging method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
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- 238000005457 optimization Methods 0.000 description 3
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- 230000009467 reduction Effects 0.000 description 2
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Classifications
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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
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- 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
Abstract
The present invention proposes a kind of Miniature projection lens of the low distortion of high-resolution, it is characterized in that, the Miniature projection lens include two parts microscope group, and first part is diverging microscope group, has negative power, second part is assembles microscope group, with positive light coke, the diverging microscope group includes the first lens (L1), the second lens (L2) successively, third lens (L3), the 4th lens (L4)；The convergence microscope group includes the 5th lens (L5), the 6th lens group (L6), the 7th lens (L7), the 8th lens (L8), the 9th lens (L9) successively.The systemic resolution of the present invention is high, reaches 100lp/mm, higher than the 66lp/mm 50lp/mm of mill run；Systematical distortion is low, is 0.14%；It is compact-sized；All spheric glasses, it is at low cost, it is suitable for mass production.
Description
Technical field
The present invention relates to the shadow casting techniques in photoelectric display industry, and in particular to a kind of low distortion micro projection of high-resolution
Camera lens.
Background technology
In recent years, with the development of semiconductor technology and deeply, digital projection display technology is constantly progressive, projection device quilt
It is widely used in the every field such as industry, commercial affairs, education, family.Wherein, digitlization light processing projection device (Digital
Light Procession, DLP) by the aobvious of the picture of its high-resolution, the image of high brightness, abundant color and high contrast
Show and be increasingly becoming one of mainstream projection device.
Core component in DLP technologies mainly uses DMD (Digital Micro mirror Device) digital picture core
Piece, DMD are exclusively researched and developed by American TI Company, it is made of the digital micro-mirror of many matrix arrangements, during work
Each micro-reflector can be towards ± 12 ° of both directions into horizontal deflection, and lock about 15us, so as to make light by set direction
It is projected, and is swung with tens thousand of hertz of frequency, the overturning that the light beam from lighting source is passed through into micro-reflector
It is reflected into projection lens imaging on the screen.DMD has many advantages, such as high resolution, and signal is without digital-to-analogue conversion.
DLP lighting systems are divided into telecentric structure and non-telecentric structure.In order to improve the uniformity of projection display picture, match
The incident angle of dmd chip is at present, within the system, general to utilize the complete of TIR prism mostly using telecentric light structural system
Reflection detaches illuminating bundle and imaging beam, makes system compacter.Therefore, this just needs to use and TIR prism
The projection lens matched.In projection lens design process, the relevant parameters such as image height, field angle, focal length, relative aperture are mutually made
About, very big on final image quality influence, particularly amount of distortion is difficult control, in addition, when projection lens is matched with TIR prism
Need to retain longer back work distance from this considerably increases lens lengths and the control difficulty of off-axis aberration.Therefore it is difficult to set
Image quality height is counted out, lens construction is compact, and amount of distortion meets the camera lens of requirement again.Such as in CN015527698, it is
System uses nine spherical mirrors, and resolution ratio is only 50lp/mm, distortion about 0.7%,
Disclosed in more existing in projection lens technology, mainly pass through three kinds of technical approach improving optical system imaging matter
Amount：First, using aspheric surface technology, i.e., by adding in non-spherical lens, improving the image quality of optical system or simplifying system
Structure, but processing due to non-spherical lens and matching requirements are stringenter, and this can promote the Mass production of projection lens
Cost reduces production efficiency, for example, in patent CN103246047, using a falcate single side even aspheric surface, increases
Processing and assembly difficulty；Second, by the quantity of lens in increase system, this can cause projection lens length long, and system is not
It is enough compact；Third, by using the high refractive index optical material of external import, improving optical image quality, but this is just significantly
Increase the cost of Mass production.For example, in Japan Patent 02120574, using materials such as FCD1, LAF, and lens numbers
At 12 or more, camera lens is of high cost.
Invention content
It designed for projection lens in the prior art and the lens construction solved is needed in production process, image quality, be produced into
The problem of this is mutually restricted, the present invention proposes a kind of and TIR prism and the matched projection lens structures of DMD, according to diaphragm position
It puts and the optimization of element index, reduction visual field distortion improves image quality, resolution ratio improved, and compact-sized, all using ball
Face lens, processing and assembly cost are low, suitable for batch production.
The purpose of the present invention is what is be achieved through the following technical solutions.
The Miniature projection lens of the low distortion of a kind of high-resolution, which is characterized in that the Miniature projection lens include two
Divide microscope group, first part is diverging microscope group, has negative power, and second part is convergence microscope group, has positive light coke.
Preferably, the diverging microscope group includes the first lens (L1) successively, the second lens (L2), third lens (L3), and the
Four lens (L4)；It is described convergence microscope group successively include the 5th lens (L5), the 6th lens group (L6), the 7th lens (L7), the 8th
Lens (L8), the 9th lens (L9).
Preferably, the focal power distribution of the Miniature projection lens meets following inequality：
Wherein, f1 is the focal length for dissipating microscope group, and f2 is the focal length for assembling microscope group.
Preferably, the first lens (L1) is the positive lens of planoconvex, and convex surface is backwards to diaphragm；Second lens (L2) are curved
Month shape negative lens, concave surface is towards diaphragm；Third lens (L3) are falcate positive lens, and concave surface is towards diaphragm；4th lens
(L4), for negative meniscus, concave surface is towards diaphragm；5th lens (L5) are falcate positive lens, and concave surface is towards light
Door screen；6th lens group (L6) is double glued negative lenses that double concave negative lens (L6-1) and lenticular positive lens (L6-2) form
Group；7th lens (L7) are lenticular positive lens；8th lens (L8) are negative meniscus, and concave surface is backwards to diaphragm；9th
Lens (L9) are lenticular positive lens.
Preferably, diaphragm is between the 4th lens (L4) and the 5th lens (L5).
Preferably, all eyeglasses use glass material.
Preferably, wherein the first lens (L1), the second lens (L2), the 5th lens (L5), lenticular positive lens (L6-2),
7th lens (L7), the 9th lens (L9) are low-refraction, low dispersion, common barium crown glass；4th lens (L4) are common
H-K9L crown glasses；Third lens (L3), double concave negative lens (L6-1), the 8th lens (L8) are high refractive index, high dispersion
Flint glass.
Preferably, the Miniature projection lens overall length 90mm, maximum caliber 46mm, F# 2.4 project ratio 1.56, regard entirely
80.5 ° of rink corner.
The advantage of the invention is that：Systemic resolution is high, reaches 100lp/mm, higher than the 66lp/mm- of mill run
50lp/mm；Systematical distortion is low, is 0.14%；It is compact-sized；All spheric glasses, it is at low cost, it is suitable for mass production.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this field
Technical staff will become clear.Attached drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is the optical system diagram of the low distortion Miniature projection lens of middle high-resolution of the present invention；
Fig. 2 is the ray trajectory figure of the low distortion Miniature projection lens of middle high-resolution of the present invention；
Fig. 3 is the transfer curve of the low distortion Miniature projection lens of middle high-resolution of the present invention；
Fig. 4 is the point range figure of the low distortion Miniature projection lens of middle high-resolution of the present invention；
Fig. 5 is the low distortion curvature of field of Miniature projection lens of middle high-resolution of the present invention and distortion curve figure；
Fig. 6 is the vertical axial aberration of the low distortion Miniature projection lens of middle high-resolution of the present invention.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although this public affairs is shown in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure, and can be by this public affairs on the contrary, providing these embodiments
The range opened completely is communicated to those skilled in the art.
The present invention proposes a kind of Miniature projection lens of the low distortion of high-resolution, as depicted in figs. 1 and 2, micro projection
Camera lens includes nine groups of eyeglasses, is made of two parts, and first part is diverging microscope group (S1), has negative power, dissipates microscope group
(S1) include four groups of eyeglasses, the first lens (L1), the second lens (L2), third lens (L3), the 4th lens (L4) altogether；Second
It is divided into and assembles microscope group (S2), there is positive light coke, including the 5th lens (L5), the 6th lens group (L6), L6 is cemented doublet,
Including double concave negative lens (L6-1) and lenticular positive lens (L6-2), the 7th lens (L7), the 8th lens (L8), the 9th lens
(L9)。
Projection lens is the microscope group of negative power using accurate anti-long distance imaging optical system structure, i.e. first part, makes light
Line has significant disperse function, and the system of being effectively ensured has enough back work distances from remote object is imaged on convergent mirror
Near 2 times of focal lengths of object space of group, the present invention is conducive to using the first lens (L1) and the second lens in diverging microscope group (S1)
(L2) focal length of system different distance is optimized, while so that lens construction is compact.
The possibility focused in order to ensure high imaging quality and by dissipating microscope group, the focal power distribution of the projection lens will
Meet certain range, meet following inequality：
Wherein, f1 is the focal length for dissipating microscope group (S1), and f2 is the focal length for assembling microscope group (S2), if be unsatisfactory for above-mentioned etc.
Formula, system are difficult by dissipating the optimization realization of microscope group (S1) to the focusing of different distance and ensureing the high into image quality of camera lens
Amount.
First lens (L1) are the positive lens of planoconvex, and convex surface is backwards to diaphragm；Second lens (L2), bear for falcate
Lens, concave surface is towards diaphragm；Third lens (L3) are falcate positive lens, and concave surface is towards diaphragm；4th lens (L4),
For negative meniscus, concave surface is towards diaphragm；Diaphragm is between the 4th prism (L4) and the 5th lens (L5)；5th lens
(L5), for falcate positive lens, concave surface is towards diaphragm, the 6th lens group (L6), for double glued negative lens groups, included by
Lens (L6-1) are double concave negative lens, and lens (L6-2) are lenticular positive lens；7th lens (L7) are lenticular positive lens；
8th lens (L8) are negative meniscus, and concave surface is backwards to diaphragm；9th lens (L9) are lenticular positive lens.
In diverging microscope group (S1), by the second lens (L2) to the beam divergence of each visual field so that the projection of light
Highly increase, aperture senior aberration will increase, and thus two neighboring lens L1, L3 are configured with convergent lens, and light beam is carried out
It assembles, into the diaphragm of system, stop position, on the one hand can be appropriate in the front surface for assembling microscope group (S2) the 5th lens (L5)
Reducing influences, while also more can guarantee the raising of image sensors' uniformity caused by the senior aberration of aperture.
The visual field that convergence microscope group (S2) with positive light coke mainly corrects the optical system after big field rays refraction is high
Grade aberration.Balsaming lens (L6) is made of concavees lens (L6-1) and convex lens (L6-2), and the axial chromatic aberration of system can be carried out
Effectively correction.
All microscope groups use glass material, wherein L1, L2, L5, L6-2, L7, L9 be low-refraction, it is low dispersion, common
Barium crown glass；L4 is common H-K9L crown glasses；L3, L6-1, L8 are high refractive index, the flint glass of high dispersion.
The structural parameters of the low Miniature projection lens that distort of high-resolution of the present invention are referring to following table：
Preferably, camera lens overall length 90mm, maximum caliber 46mm, F# 2.4 project ratio 1.56,80.5 ° of full filed angle.
In order to be matched with dmd chip and lighting system, projection lens uses image planes telecentric structure, ensures the light of each visual field
Beam has identical incidence angle.After optimized, system wave aberration is smaller, and image quality is promoted, the resolution ratio of all visual fields in system
All reach 100lp/mm, there is high-resolution, transfer curve figure is as shown in figure 3, from figure 3, it can be seen that all
Visual field is more than 60% in 100lp/mm optical transfer functions, and index is higher.The high resolution of 100lp/mm is in institute in the prior art
The 50lp/mm of design.
Fig. 4 is the point range figure of the low distortion Miniature projection lens of middle high-resolution of the present invention, from fig. 4 it can be seen that Airy
Spot radius is 1.21um, to being 2.047um with the geometric radius of visual field point on axis, picture point；Corresponding to the outer 33mm visual field points of axis
Picture point geometric radius for 4.165um, the picture point geometric radius corresponding to the outer 55mm visual field points of axis is 10.454um；Illustrate be
Picture point on system axis and corresponding to the outer visual field point of axis is all the quantitative levels of Airy radius, and system imaging quality is preferable.
By the front surface that diaphragm is placed into the 5th lens (L5) so that microscope group S1, S2 tends to be symmetrical, to the comprehensive of system
Aberration is closed, particularly distortion is corrected；In addition, pincushion distortion and barrel distortion by optimizing adjacent surface so that systematical distortion
It reduces；For the reduction that visual field outside axis distorts, mainly realized by the lens of optimization distance diaphragm farther out.Fig. 5 is in the present invention
The low distortion curvature of field of Miniature projection lens of high-resolution and distortion curve figure, from fig. 5, it can be seen that the distortion of system is
0.15%, and the basic indifference of systematical distortion curve under corresponding different wave length.System corresponds to meridian and arc under different wave length
Swear that the curvature of field in direction is more consistent, essentially 0.06mm.Distortion and curvature of field curve proof system image quality are preferable.
Fig. 6 is the vertical axial aberration of the low distortion Miniature projection lens of middle high-resolution of the present invention, it can be seen that height of the invention
The low distortion Miniature projection lens of resolution ratio, hanging down, axial aberration is small, and image quality is preferable.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (8)
1. the Miniature projection lens of the low distortion of a kind of high-resolution, which is characterized in that the Miniature projection lens include two parts
Microscope group, first part are diverging microscope group, have negative power, and second part has positive light coke to assemble microscope group.
2. a kind of Miniature projection lens of the low distortion of high-resolution according to claim 1, the diverging microscope group is wrapped successively
Include the first lens (L1), the second lens (L2), third lens (L3), the 4th lens (L4)；The convergence microscope group includes the successively
Five lens (L5), the 6th lens group (L6), the 7th lens (L7), the 8th lens (L8), the 9th lens (L9).
3. a kind of Miniature projection lens of the low distortion of high-resolution according to claim 1 or 2, the Miniature projection lens
Focal power distribution meet following inequality：
Wherein, f1 is the focal length for dissipating microscope group, and f2 is the focal length for assembling microscope group.
4. a kind of Miniature projection lens of the low distortion of high-resolution according to claims 1 or 2 or 3, the first lens (L1),
For the positive lens of planoconvex, convex surface is backwards to diaphragm；Second lens (L2) are negative meniscus, and concave surface is towards diaphragm；The
Three lens (L3) are falcate positive lens, and concave surface is towards diaphragm；4th lens (L4), for negative meniscus, concave surface court
To diaphragm；5th lens (L5) are falcate positive lens, and concave surface is towards diaphragm；6th lens group (L6) is born for double concave
Double glued negative lens groups of mirror (L6-1) and lenticular positive lens (L6-2) composition；7th lens (L7) are lenticular positive lens；
8th lens (L8) are negative meniscus, and concave surface is backwards to diaphragm；9th lens (L9) are lenticular positive lens.
5. a kind of Miniature projection lens of the low distortion of high-resolution according to claim 4, diaphragm are located at the 4th lens
(L4) between the 5th lens (L5).
6. a kind of Miniature projection lens of the low distortion of high-resolution according to any one of claims 1-5, all eyeglasses
Use glass material.
7. a kind of Miniature projection lens of the low distortion of high-resolution according to claim 6, wherein the first lens (L1),
Two lens (L2), the 5th lens (L5), lenticular positive lens (L6-2), the 7th lens (L7), the 9th lens (L9) are low refraction
Rate, low dispersion, common barium crown glass；4th lens (L4) are common H-K9L crown glasses；Third lens (L3), concave-concave
Shape negative lens (L6-1), the 8th lens (L8) are high refractive index, the flint glass of high dispersion.
8. a kind of Miniature projection lens of the low distortion of high-resolution according to any one in claim 1-7, described micro-
Type projection lens overall length 90mm, maximum caliber 46mm, F# 2.4 project ratio 1.56,80.5 ° of full filed angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810144424.3A CN108227150B (en) | 2018-02-12 | 2018-02-12 | High-resolution low-distortion miniature projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810144424.3A CN108227150B (en) | 2018-02-12 | 2018-02-12 | High-resolution low-distortion miniature projection lens |
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| CN108227150A true CN108227150A (en) | 2018-06-29 |
| CN108227150B CN108227150B (en) | 2023-11-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358408A (en) * | 2018-11-23 | 2019-02-19 | 广东奥普特科技股份有限公司 | A kind of wide operating distance high-resolution machine visual lens of big visual field |
| CN111290105A (en) * | 2020-02-26 | 2020-06-16 | 歌尔股份有限公司 | Optical system and projection apparatus |
| CN113419333A (en) * | 2021-06-22 | 2021-09-21 | 歌尔光学科技有限公司 | Projection lens group and projection device |
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| TW201214006A (en) * | 2010-09-17 | 2012-04-01 | Asia Optical Co Inc | Fixed-focus projection lens |
| CN103149668A (en) * | 2011-12-06 | 2013-06-12 | 佛山普立华科技有限公司 | Zoom projection lens |
| CN107305276A (en) * | 2016-04-21 | 2017-10-31 | 佳能企业股份有限公司 | Optical lens |
| CN207965338U (en) * | 2018-02-12 | 2018-10-12 | 中国科学院光电研究院 | A kind of low distortion Miniature projection lens of high-resolution |
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2018
- 2018-02-12 CN CN201810144424.3A patent/CN108227150B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1621884A (en) * | 2003-11-28 | 2005-06-01 | 塞金诺斯株式会社 | Projection lens |
| TW201214006A (en) * | 2010-09-17 | 2012-04-01 | Asia Optical Co Inc | Fixed-focus projection lens |
| CN103149668A (en) * | 2011-12-06 | 2013-06-12 | 佛山普立华科技有限公司 | Zoom projection lens |
| CN107305276A (en) * | 2016-04-21 | 2017-10-31 | 佳能企业股份有限公司 | Optical lens |
| CN207965338U (en) * | 2018-02-12 | 2018-10-12 | 中国科学院光电研究院 | A kind of low distortion Miniature projection lens of high-resolution |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358408A (en) * | 2018-11-23 | 2019-02-19 | 广东奥普特科技股份有限公司 | A kind of wide operating distance high-resolution machine visual lens of big visual field |
| CN109358408B (en) * | 2018-11-23 | 2024-02-13 | 广东奥普特科技股份有限公司 | Large-view-field wide-working-distance high-resolution machine vision lens |
| CN111290105A (en) * | 2020-02-26 | 2020-06-16 | 歌尔股份有限公司 | Optical system and projection apparatus |
| CN111290105B (en) * | 2020-02-26 | 2022-05-24 | 歌尔股份有限公司 | Optical system and projection apparatus |
| CN113419333A (en) * | 2021-06-22 | 2021-09-21 | 歌尔光学科技有限公司 | Projection lens group and projection device |
| CN113419333B (en) * | 2021-06-22 | 2022-09-20 | 歌尔光学科技有限公司 | Projection lens group and projection device |
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| CN108227150B (en) | 2023-11-17 |
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