CN110515188A - A kind of projection lens - Google Patents
A kind of projection lens Download PDFInfo
- Publication number
- CN110515188A CN110515188A CN201910901649.3A CN201910901649A CN110515188A CN 110515188 A CN110515188 A CN 110515188A CN 201910901649 A CN201910901649 A CN 201910901649A CN 110515188 A CN110515188 A CN 110515188A
- Authority
- CN
- China
- Prior art keywords
- eyeglass
- lens
- focal length
- group
- projection lens
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- 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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
Abstract
This application discloses a kind of projection lens, it successively includes: first group's lens with positive focal length that camera lens, which reduces end from imaging amplification end to imaging, and diaphragm has second group's lens of positive focal length, shakes device, light-splitting device, protects glass and imaging surface；The focal length of first group's lens is 110 < f7 < 130, and the focal length of second group's lens is 11.3 < f8 < 13.3；The last face camera lens of second group's lens is plastic aspherical element.A kind of projection lens provided by the present application participates in imaging by setting shake device, so that resolution ratio when the device of projection lens is static is the intrinsic resolution ratio of dmd chip, and while shaking is another resolution ratio.
Description
Technical field
This application involves projection lens technical field more particularly to a kind of projection lens.
Background technique
Projection lens is the core component of projection device: light needs after reflective or penetration light changing device
By being imaged in projection lens projects to projection screen.
As role is increasing in life for projection device, the field being applied to also can be more and more.More
Equipment need to be embedded in micro-projection device, this requirement to projection lens is also higher and higher, and smaller, structure is more stepped up
It gathers, imaging effect is more preferable, and the lower projection lens of cost becomes mainstream.
Existing projection lens on the market, transmittance is generally 1.2 or more, and field angle is at 60 ° or so, existing projected light
The camera lens of machine can only be adapted to a kind of resolution ratio of fixation, while the Lens projected are longer.In order to meet high-resolution city
Field demand, reduces the imaging design difficulty of camera lens, F number majority will cause the decline of brightness 2 or more in this way.
Summary of the invention
This application provides a kind of projection lens, imaging are participated in by setting shake device, so that the device of projection lens
Resolution ratio when static is the intrinsic resolution ratio of dmd chip, and while shaking is another resolution ratio.
This application provides a kind of projection lens, it includes: tool that the camera lens, which reduces end successively from imaging amplification end to imaging,
There are first group's lens of positive focal length, diaphragm, second group's lens with positive focal length shake device, light-splitting device, protect glass
Glass and imaging surface；The focal length of first group lens is 110 < f7 < 130, and the focal length of second group lens is 11.3 < f8
<13.3；The last face camera lens of second group lens is plastic aspherical element.
Preferably, first group lens successively include the first eyeglass, the second eyeglass, third eyeglass.
Preferably, first eyeglass is the concave-convex type plastic aspheric lens with negative focal length；Second eyeglass is
Platycelous glass lens with negative focal length；The third eyeglass is the biconvex glass lens with positive focal length.
Preferably, two surfaces of first eyeglass are aspherical；Two surfaces of second eyeglass are ball
Face；Two surfaces of the third eyeglass are spherical surface.
Preferably, the focal length of first eyeglass is -14.59 < f1 < -16.59；The focal length of second eyeglass be-
23.85<f2<-21.82；The focal length of the third eyeglass is 13.9 < f3 < 15.9.
Preferably, second group lens successively include the 4th eyeglass, the 5th eyeglass, the 6th eyeglass, the 7th eyeglass and
8th eyeglass.
Preferably, the 4th eyeglass is the planoconvex glass lens with positive focal length；5th eyeglass is with negative
The double concave type glass lens of focal length；6th lens are the curved month type glass lens with positive focal length；7th eyeglass is
Biconvex glass lens with positive focal length；8th lens are the biconvex glass lens with positive focal length.
Preferably, two surfaces of the 4th eyeglass are spherical surface；Two surfaces of the 5th eyeglass are spherical surface；
Two surfaces of the 6th eyeglass are spherical surface；Two surfaces of the 7th eyeglass are spherical surface；8th eyeglass
Two surfaces are spherical surface.
Preferably, the focal length of the 4th eyeglass is 20.58 < f4 < 22.58；The focal length of 5th eyeglass be -11.5 <
f5<-9.5；The focal length of 6th eyeglass is 27.35 < f6 < 29.35；The focal length of 7th eyeglass is 27.5 < f7 < 29.5；
The focal length of 8th eyeglass is 20.6 < f8 < 22.6.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
This application provides a kind of projection lens, it includes: tool that the camera lens, which reduces end successively from imaging amplification end to imaging,
There are first group's lens of positive focal length, diaphragm, second group's lens with positive focal length shake device, light-splitting device, protect glass
Glass and imaging surface；The focal length of first group lens is 110 < f7 < 130, and the focal length of second group lens is 11.3 < f8
<13.3；The last face camera lens of second group lens is plastic aspherical element.
A kind of projection lens provided by the present application participates in imaging by setting shake device, so that the device of projection lens
Resolution ratio when static is the intrinsic resolution ratio of dmd chip, and while shaking is another resolution ratio.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of optical structure chart of the projection lens provided in the embodiment of the present application；
Fig. 2 is a kind of each visual field transmission function mtf value of the projection lens provided in the embodiment of the present application；
Fig. 3 is the curvature of field and distortion figure of a kind of projection lens provided in the embodiment of the present application, and Millineters is the curvature of field
Evaluation figure, Percent are distortion evaluation figure；
Fig. 4 is a kind of chromatic longitudiinal aberration curve graph of the projection lens provided in the embodiment of the present application.
Specific embodiment
This application provides a kind of projection lens, imaging are participated in by setting shake device, so that the device of projection lens
Resolution ratio when static is the intrinsic resolution ratio of dmd chip, and while shaking is another resolution ratio.
Referring to figures 1-4, Fig. 1 is a kind of optical structure chart of the projection lens provided in the embodiment of the present application；Fig. 2 is this
A kind of each visual field transmission function mtf value of the projection lens provided in application embodiment；Fig. 3 is to provide in the embodiment of the present application
A kind of curvature of field and distortion figure of projection lens, Millineters are curvature of field evaluation figure, and Percent is distortion evaluation figure；Fig. 4 is
A kind of chromatic longitudiinal aberration curve graph of the projection lens provided in the embodiment of the present application.
Fig. 1 is a kind of optical structure chart of the projection lens provided in the embodiment of the present application；This application provides a kind of throwings
Shadow camera lens, the camera lens successively include: first group's lens, a diaphragm, one with positive focal length from amplification end to end is reduced
Second group's lens, shake device, light-splitting device, protection glass, imaging surface with positive focal length；First group's lens include the
One eyeglass, the concave-convex type lens with negative focal length；Second eyeglass, the platycelous lens with negative focal length；Third eyeglass has just
The lenticular lens of focal length；4th eyeglass, the plane-convex lens with positive focal length；5th eyeglass, the double concave type with negative focal length
Lens；6th eyeglass, the meniscus lens with positive focal length；7th eyeglass, the lenticular lens with positive focal length；8th mirror
Piece, the lenticular lens with positive focal length.
The Miniature projection lens use negative lens P1, negative lens G2, negative lens G3, the aperture of the diaphragm, positive lens G4, positive lens
G5, positive lens G6, positive lens G7 and positive lens G8 successively reduce the mode that end arranges from imaging amplification end to imaging and realize:
First eyeglass P1 is using, with the concave-convex type lens of negative power, concave surface is towards aperture made by plastic material
Diameter direction, and two surfaces S1, S2 are non-spherical surface；The focal length of first eyeglass meets -14.59 < f1- < -16.59, refraction
Rate meets Nd1=1.531.
Second eyeglass G2, using having negative power, platycelous lens, and two surfaces S3, S4 made by glass material
It is spherical face, curved surface is towards aperture of the diaphragm direction；The focal length of second eyeglass meets -23.85 < f2 < -21.82, and refractive index is full
Sufficient Nd2=1.620.
Third eyeglass G3, using having positive light coke lenticular lens made by glass material, and two surfaces S5, S6 are equal
It is identical for spherical face radius of curvature；The focal length of third eyeglass meets 13.9 < f3 < 15.9, and refractive index meets Nd3=1.749.
4th eyeglass G4, using having positive light coke plane-convex lens made by glass material, and two surfaces S6, S7 are equal
For spherical face, curved surface is towards the aperture of the diaphragm；The focal length of 4th eyeglass meets 20.58 < f4 < 22.58, and refractive index meets Nd4=
37.23。
5th eyeglass G5, using having negative power double concave type lens made by glass material, and two surfaces S8, S9 are equal
For spherical face, wherein the lesser mirror surface of radius of curvature is towards the aperture of the diaphragm；- 11.5 < f5 of focal length satisfaction of 5th eyeglass <-
9.5, refractive index meets Nd5=28.310.
6th eyeglass G6, using having positive light coke meniscus lens, and two surfaces S10, S11 made by glass material
It is spherical face, two faces are towards the aperture of the diaphragm；The focal length of 6th eyeglass meets 27.35 < f6 < 29.35, and refractive index meets
Nd6=36.354.
7th eyeglass G7, using made by glass material with the lenticular lens of positive focal length, and two surfaces S12, S13
It is spherical surface and curvature is identical, the focal length of the 7th eyeglass meets 27.5 < f7 < 29.5, refractive index Nd=1.603.
8th eyeglass G8, using the lenticular lens made by glass material with positive focal length, the biggish court of radius of curvature
To the aperture of the diaphragm, the focal length of the 8th eyeglass meets 20.6 < f8 < 22.6, refractive index Nd=1.613.
The focal length of first group's lens meets: 110 < f9 < 130, and second group's focal length of lens meets: 11.3 < f10 < 13.3.
It is provided by the embodiments of the present application miniature for the technical purpose for reaching the optical property for effectively promoting Miniature projection lens
The design parameter of projection lens such as table one；Wherein parameter includes the thickness of each eyeglass, spacing, the refractive index Nd of each eyeglass
The radius of curvature R of (Refractive index), numerical aperture F/NO, Abbe number Vd (Abbe number) and each eyeglass
(Radius of curvature)。
Table one
Surface is aspherical there are two wherein, and surface S1, S2 of non-spherical lens P1 can just obtain ball by aspherical formula
The corresponding curve in face；Aspherical formula is following formula:
Wherein: Z indicate aspherical on point from aspheric vertex of surface with a distance from optical axis direction；R indicates the point on non-surface
To the distance of optical axis；C indicates aspherical curvature of centre；K indicates rate of taper；A4, a6, a8, a10 indicate aspherical high order term system
Number.
Each level number of non-spherical lens P1 and GM8, as shown in Table 2.
Table two
According to the projection lens that the design parameter of above-mentioned each lens obtains, as shown in optical system Fig. 2.MTF (English name
Claiming: Modulation Transfer Function) index is that current camera lens is most accurate and the evaluation criterion of science.Ordinate is
It is more perfect to represent lens imaging closer to 1 for contrast.Abscissa represents resolution ratio, every millimeter of demand pairs of unit.The application is real
Image source pixel size that example uses is applied as 5.4um, corresponding design resolution is 93 lines to every millimeter.Projection lens is generally at least
It is required that the mtf numerical value of each visual field reaches 0.3 or more in design resolution, and the mtf value base of each visual field of the embodiment of the present application
This is 0.5 or more.
Left figure is curvature of field evaluation figure in Fig. 3, and right figure is distortion evaluation figure.Ordinate represents the field of view angle of the camera lens.
The abscissa of diagram represents the size of curvature of field value, and the abscissa of distortion figure represents amount of distortion.Distortion is that one of projection lens is non-
Often important index is typically necessary control within 3%, and the amount of distortion of the embodiment of the present application is within 1%.
Fig. 4 is the chromatic longitudiinal aberration figure of camera lens, and ordinate is image height visual field value size, and abscissa is numerical values recited, and unit is micro-
Rice.In figure on the basis of dominant wavelength, the value of chromatism of each visual field between blue light, feux rouges and green light (dominant wavelength) is drawn respectively.Projection
Camera lens generally requires value of chromatism within an image source pixel size, the control of the chromatic longitudiinal aberration of the embodiment of the present application 2.6um with
It is interior, less than 0.5 pixel size (pixel size 5.4um).
In general, relative aperture value is smaller, and image quality more readily satisfies, but relative aperture value is small, by light
It can just become smaller, lead to the decline of projection brightness, so the embodiment of the present application, improves the same of relative aperture value by optical design
When, and can guarantee image quality, there are many promotions to brightness.
Camera lens applies a piece of aspherical lens, and 1 aspherical lens correct the ability of aberration close to several pieces spheric glasses, institute
To effectively reduce eyeglass requirement, shorten the length of camera lens compared with the camera lens of pure spheric glass.
First face is plastic aspherical element, compared with the correction that spherical surface is more advantageous to aberration, while reducing cost.
Since projection lens needs to bear a large amount of projection light, part luminous energy can be converted into thermal energy, the last a piece of mirror of camera lens
More luminous energy are assembled in sector-meeting, and eyeglass temperature is caused to increase.Influence of the temperature to plastic material is bigger, if finally a piece of adopt
It with plastic aspherical element, is then easy to happen and runs burnt problem, therefore eyeglass of the application in addition to the first face eyeglass is glass aspheric
Plane materiel matter can be avoided the burnt problem of race.
The embodiment of the present application is adapted to the display of a variety of resolution ratio, can be applicable to a variety of image source displaying schemes, as DMD, laser,
LCOS, LCD etc..There is the biggish margin of tolerance using 8 lens structures, improves the volume production yield of camera lens.
A kind of Miniature projection lens provided by the embodiment of the present application are described in detail above, for this field
Those skilled in the art, according to the thought of the embodiment of the present application, there will be changes in the specific implementation manner and application range,
In conclusion the contents of this specification should not be construed as limiting the present application.
Claims (9)
1. a kind of projection lens, which is characterized in that it includes: to have just that the camera lens, which reduces end successively from imaging amplification end to imaging,
First group's lens of focal length, diaphragm, with positive focal length second group's lens, shake device, light-splitting device, protection glass and
Imaging surface；The focal length of first group lens is 110 < f7 < 130, the focal lengths of second group lens be 11.3 < f8 <
13.3；The last face camera lens of second group lens is plastic aspherical element.
2. a kind of projection lens according to claim 1, which is characterized in that first group lens successively include first
Eyeglass, the second eyeglass, third eyeglass.
3. a kind of projection lens according to claim 2, which is characterized in that first eyeglass is with the recessed of negative focal length
Convex plastic aspheric lens；Second eyeglass is the platycelous glass lens with negative focal length；The third eyeglass is tool
There is the biconvex glass lens of positive focal length.
4. a kind of projection lens according to claim 2, which is characterized in that two surfaces of first eyeglass are non-
Spherical surface；Two surfaces of second eyeglass are spherical surface；Two surfaces of the third eyeglass are spherical surface.
5. a kind of projection lens according to claim 2, which is characterized in that the focal length of first eyeglass be -14.59 <
f1<-16.59；The focal length of second eyeglass is -23.85 < f2 < -21.82；The focal length of the third eyeglass be 13.9 < f3 <
15.9。
6. a kind of projection lens according to claim 1, which is characterized in that second group lens successively include the 4th
Eyeglass, the 5th eyeglass, the 6th eyeglass, the 7th eyeglass and the 8th eyeglass.
7. a kind of projection lens according to claim 6, which is characterized in that the 4th eyeglass is flat with positive focal length
Convex glass lens；5th eyeglass is the double concave type glass lens with negative focal length；6th lens are with positive coke
Away from curved month type glass lens；7th eyeglass is the biconvex glass lens with positive focal length；8th lens are tool
There is the biconvex glass lens of positive focal length.
8. a kind of projection lens according to claim 6, which is characterized in that two surfaces of the 4th eyeglass are ball
Face；Two surfaces of the 5th eyeglass are spherical surface；Two surfaces of the 6th eyeglass are spherical surface；7th eyeglass
Two surfaces be spherical surface；Two surfaces of the 8th eyeglass are spherical surface.
9. a kind of projection lens according to claim 6, which is characterized in that the focal length of the 4th eyeglass is 20.58 < f4
<22.58；The focal length of 5th eyeglass is -11.5 < f5 < -9.5；The focal length of 6th eyeglass is 27.35 < f6 < 29.35；
The focal length of 7th eyeglass is 27.5 < f7 < 29.5；The focal length of 8th eyeglass is 20.6 < f8 < 22.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910901649.3A CN110515188A (en) | 2019-09-23 | 2019-09-23 | A kind of projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910901649.3A CN110515188A (en) | 2019-09-23 | 2019-09-23 | A kind of projection lens |
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| Publication Number | Publication Date |
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| CN110515188A true CN110515188A (en) | 2019-11-29 |
Family
ID=68631928
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| CN201910901649.3A Pending CN110515188A (en) | 2019-09-23 | 2019-09-23 | A kind of projection lens |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908225A (en) * | 2019-12-31 | 2020-03-24 | 成都极米科技股份有限公司 | Projection lens and projection equipment |
| CN111897182A (en) * | 2020-09-10 | 2020-11-06 | 深圳市点睛创视技术有限公司 | Ultrashort-focus objective lens system for miniature projection |
| CN112269241A (en) * | 2020-11-20 | 2021-01-26 | 四川长虹电器股份有限公司 | Projection lens suitable for DLP photocuring 3D printing |
| CN112379520A (en) * | 2020-11-06 | 2021-02-19 | 歌尔光学科技有限公司 | Projection lens and be provided with on-vehicle HUD of this projection lens |
| WO2021128391A1 (en) * | 2019-12-28 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Image pickup optical camera |
| CN113419333A (en) * | 2021-06-22 | 2021-09-21 | 歌尔光学科技有限公司 | Projection lens group and projection device |
| CN114942561A (en) * | 2022-07-26 | 2022-08-26 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111897182A (en) * | 2020-09-10 | 2020-11-06 | 深圳市点睛创视技术有限公司 | Ultrashort-focus objective lens system for miniature projection |
| CN112379520A (en) * | 2020-11-06 | 2021-02-19 | 歌尔光学科技有限公司 | Projection lens and be provided with on-vehicle HUD of this projection lens |
| CN112269241A (en) * | 2020-11-20 | 2021-01-26 | 四川长虹电器股份有限公司 | Projection lens suitable for DLP photocuring 3D printing |
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| CN114942561A (en) * | 2022-07-26 | 2022-08-26 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
| CN114942561B (en) * | 2022-07-26 | 2022-11-22 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
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Application publication date: 20191129 |