CN209311772U - A kind of Miniature projection lens - Google Patents
A kind of Miniature projection lens Download PDFInfo
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- CN209311772U CN209311772U CN201822254758.4U CN201822254758U CN209311772U CN 209311772 U CN209311772 U CN 209311772U CN 201822254758 U CN201822254758 U CN 201822254758U CN 209311772 U CN209311772 U CN 209311772U
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- miniature projection
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Abstract
This application discloses a kind of Miniature projection lens, comprising: first group's lens, diaphragm, second group's lens shake device, and light-splitting device protects glass and imaging surface；First group lens are negative focal length, and second group lens are positive focal length.A kind of Miniature projection lens disclosed in the present application are able to satisfy image quality while improving relative aperture value by optical design again, have greatly improved to brightness.
Description
Technical field
The application belongs to projection lens technical field more particularly to a kind of Miniature 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 cost is lower.
Current Miniature projection lens most on the market can only be adapted to a kind of resolution ratio.For better viewing experience,
Projection industry develops pixel " shake " technology, and generally the exactly low dmd chip of resolution ratio can be by additional
" shake " device (actuator) can promote display resolution, and this device is to participate in imaging, so projection lens is set
Timing, it is necessary to take into account influence of the device to optical path, be intrinsic resolution ratio when device is static, when shake is another resolution ratio.
In general, relative aperture value is smaller, and image quality more readily satisfies, but aperture value is small, and brightness also becomes smaller therewith.
Utility model content
This application discloses a kind of Miniature projection lens, are able to satisfy again while improving relative aperture value by optical design
Image quality has greatly improved to brightness.
This application provides a kind of Miniature projection lens, the camera lens includes: that the first group is saturating from amplification end to end is reduced
Mirror, diaphragm, second group's lens shake device, and light-splitting device protects glass and imaging surface；First group lens are negative
Focal length, second group lens are positive focal length.
Preferably, the focal length of first group lens is 317 < f9 < 320；The focal length of second group lens is
17.25<f10<19.35。
Preferably, first group lens include the first eyeglass, the second eyeglass and third eyeglass being arranged successively.
Preferably, first eyeglass is the convex-concave plastic aspheric lens with negative focal length；Second eyeglass is
Double concave type glass lens with negative focal length；The third eyeglass is the biconvex glass lens with positive focal length.
Preferably, two surfaces of first camera lens are the concave surface of aspherical and described first camera lens towards the aperture of the diaphragm
Direction；Two surfaces of second camera lens are spherical surface and the biggish surface of curvature backwards to aperture diaphragm；The third camera lens
Two surfaces be spherical surface and curvature is identical.
Preferably, the focal length of first eyeglass is -18.32 < f1 < -16.32；The focal length of second eyeglass be-
37.85<f2<-35.82；The focal length of the third eyeglass is 22.25 < f3 < 24.25.
Preferably, second group lens include the 4th eyeglass, the 5th eyeglass, the 6th eyeglass, the 7th being arranged successively
Eyeglass and the 8th eyeglass.
Preferably, the 4th eyeglass is the double concave type glass lens with positive focal length；5th eyeglass is with just
The biconvex glass lens of focal length；6th eyeglass is the concave-convex type glass lens with negative focal length；7th eyeglass is
Biconvex glass lens with positive focal length；8th eyeglass is the biconvex glass lens with positive focal length.
Preferably, two surfaces of the 4th eyeglass are spherical surface and the biggish surface of curvature towards aperture diaphragm；Institute
Two surfaces for stating the 5th eyeglass are spherical surface and the biggish surface of curvature facing away to aperture diaphragm；Two of 6th eyeglass
Surface is spherical surface and facing towards aperture diaphragm；Two surfaces of the 7th eyeglass are spherical surface and curvature is biggish faces
Backwards to aperture diaphragm；Two surfaces of the 8th eyeglass are aspherical and more curved surface towards aperture diaphragm.
Preferably, the focal length of the 4th camera lens is -21.58 < f4 < -19.58；The focal length of 5th camera lens is 12.25
<f5<14.25；The focal length of 6th camera lens is -23.35 < f6 < -21.35；The focal length of 7th camera lens be 26.55 < f7 <
28.55；The focal length of 8th camera lens is 38.45 < f8 < 40.45.
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 Miniature projection lens, camera lens successively includes: that the first group is saturating from amplification end to end is reduced
Mirror, diaphragm, second group's lens shake device, and light-splitting device protects glass and imaging surface；First group lens are negative
Focal length, second group lens are positive focal length.A kind of Miniature projection lens disclosed in the present application, improve phase by optical design
It is able to satisfy image quality again while to aperture value, has greatly improved to brightness.
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 Miniature projection lens provided in the embodiment of the present application；
Fig. 2 is a kind of each visual field chip face transmission function mtf value of the Miniature projection lens provided in the embodiment of the present application；
Fig. 3 is the curvature of field and distortion figure of a kind of Miniature projection lens provided in the embodiment of the present application；
Fig. 4 is a kind of chromatic longitudiinal aberration figure of the Miniature projection lens provided in the embodiment of the present application.
Specific embodiment
This application discloses a kind of Miniature projection lens, are able to satisfy again while improving relative aperture value by optical design
Image quality has greatly improved to brightness.
Fig. 1 is a kind of optical structure chart of the Miniature projection lens provided in the embodiment of the present application；This application provides one
Kind Miniature projection lens, the camera lens successively include: first group's lens, a light with negative focal length from amplification end to end is reduced
Door screen, second group's lens, shake device, light-splitting device, protection a glass, imaging surface with positive focal length；Wherein, first group
Group lens include that the first eyeglass P1 is negative focal length concave-convex type plastic aspherical element mirror, the second camera lens G2 is negative focal length double concave type glass
Lens, third camera lens G3 are positive focal length biconvex glass lens；Second group's lens include that the 4th camera lens G4 is with positive focal length
Double concave type glass lens, the 5th lens G5 are positive focal length biconvex glass lens, the 6th lens G6 is negative focal length concave-convex type glass
Lens, the 7th lens G7 are lenticular lens, the 8th lens are GM8 biconvex Glass aspheric eyeglass, wherein due to the camera lens
The last one eyeglass be set as Glass aspheric eyeglass, can effectively solve the problem that micro- throwing camera lens since plastic aspherical element eyeglass is heated
Caused by camera lens run burnt defect.
The camera lens can be adapted to a variety of resolution ratio and show, take into account influence of the shake device to optical path；The camera lens has numerical value
The big feature in aperture can effectively improve brightness while realizing superior image；The camera lens small, compact-sized, mirror with size
The few feature of piece；And the first face eyeglass P1 of the camera lens be plastic aspherical element, while distortion can be effectively corrected, save at
This.
The initial image source of the camera lens is that DMD scheme is alternatively also replaced by the displays sides such as laser, LCOS, LCD in Fig. 1
Case；
If Fig. 1 is the Miniature projection lens, respectively by negative lens P1, negative lens G2, positive lens G3, the aperture of the diaphragm is born saturating
Mirror G4, positive lens G5, negative lens G6, positive lens G7 and positive lens GM8, it is successively real from amplification end to the mode that end arranges is reduced
It is existing；Wherein, first group's focal length of lens meets: 317 < f9 < 320, and second group's focal length of lens meets: 17.25 < f10 < 19.35.
Wherein, the first eyeglass P1 is to have negative power using plastic material (nd=1.531, vd=56.04) is made
Convex-concave lens, wherein concave surface is towards aperture of the diaphragm direction, and two surfaces are aspherical；And first eyeglass effective focal length
Meet: -18.32 < f1 < -16.32.
Second eyeglass G2 is made double with negative power using glass material (nd=1.497, vd=81.595)
Concavees lens, wherein compared with flexure plane towards aperture of the diaphragm direction, and two surfaces are spherical surface；And second eyeglass effective focal length it is full
Foot: -37.85 < f2 < -35.82；
Third eyeglass G3 is made double with positive light coke using glass material (nd=1.846, vd=23.787)
Convex type lens, two surfaces are spherical surface and curvature is identical；And the effective focal length of third eyeglass meets: 22.25 < f3 < 24.25；
4th eyeglass G4 is made double with negative power using glass material (nd=1.583, vd=59.456)
Concave lens, wherein more recessed face is backwards to aperture diaphragm, and two surfaces are spherical surface；And the 4th eyeglass effective focal length it is full
Foot: -21.58 < f4 < -19.58；
5th eyeglass G5 is made double with positive light coke using glass material (nd=1.497, vd=81.595)
Convex type lens, wherein more flat faces aperture diaphragm aspect, and two surfaces are spherical surface；And the 5th eyeglass effective focal length it is full
Foot: 12.25 < f5 < 14.25；
6th eyeglass G6 is using the made bent moon with negative power of glass material (nd=1.583, vd=5.456)
Type lens, two surfaces towards aperture diaphragm and are spherical surface；And the 6th eyeglass effective focal length meet: -23.35 < f6 < -
21.35；
7th eyeglass G7 is made double with positive light coke using glass material (nd=1.471, vd=66.884)
Convex type lens, wherein it is more curved facing towards aperture diaphragm, and two surfaces are spherical surface；And the 7th eyeglass effective focal length it is full
Foot: 26.55 < f7 < 28.55；
8th eyeglass GM8 is made double with positive light coke using glass material (nd=1.589, vd=61.163)
Convex type lens, wherein it is more curved facing towards aperture diaphragm, and two surfaces are aspherical；And the 8th eyeglass effective focal length
Meet: 38.45 < f8 < 40.45；
The projection lens meets the following conditions:
The optical property of the Miniature projection lens is promoted in order to achieve the above objectives and effectively, and one kind provided by the present application is miniature
The design parameter of projection lens such as chart one；Wherein parameter includes the thickness of each eyeglass, spacing, the refractive index Nd of each eyeglass
(Refractive index), radius of curvature R (Radius of curvature), numerical aperture F/NO, focal length F (Focus
) and the Abbe number Vd of each eyeglass (Abbe number) Length.
Table one
Wherein have several eyeglasses surface be it is aspherical, surface S1, S2 and aspherical biconvex of non-spherical lens P1 is saturating
Surface S14, S15 of mirror GM8 can just be obtained the corresponding curve of spherical surface by aspherical formula；The expression formula of aspherical formula is such as
Under:
Wherein: Z indicate aspherical on point from aspheric vertex of surface with a distance from optical axis direction；R indicate aspherical on point
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 such as table two:
Table two
It referring to fig. 2, is a kind of each visual field chip face transmission function of the Miniature projection lens provided in the embodiment of the present application
Mtf value, MTF (English name: Modulation Transfer Function) index are that current camera lens is most accurate and scientific
Evaluation criterion.Ordinate is contrast, and closer to 1, it is more perfect to represent lens imaging.Abscissa represents resolution ratio, the every milli of unit
Rice noodles logarithm.For the image source pixel size that the application uses for 5.4um, corresponding design resolution is 93 lines to every millimeter.Projection
Camera lens generally at least requires the MTF numerical value of each visual field to reach 0.3 or more in design resolution, and each visual field of the application
Mtf value is substantially 0.5 or more.
Fig. 3 is the curvature of field and distortion figure of a kind of Miniature projection lens provided in the embodiment of the present application, and left figure is field in Fig. 3
Song evaluation figure, right figure are distortion evaluation figure.Ordinate represents the field of view angle of the camera lens.The abscissa of curvature of field figure represents curvature of field value
Size, the abscissa of distortion figure represents amount of distortion.Distortion is a very important index of projection lens, is typically necessary
Control is within 3%, and the amount of distortion of the application is within 1%.
Fig. 4 is a kind of chromatic longitudiinal aberration figure of the Miniature projection lens provided in the embodiment of the present application, and ordinate is image height view
Field value size, abscissa is numerical values recited, unit micron.In figure on the basis of dominant wavelength, blue light, feux rouges and green light are drawn respectively
The value of chromatism of each visual field between (dominant wavelength).Projection lens generally requires value of chromatism within an image source pixel size, this hair
Bright chromatic longitudiinal aberration controls less than 0.5 pixel size (that is: 2.7um) within 2.3um.
Compared with prior art:
1, a kind of Miniature projection lens of the application is compact-sized, and imaging effect is excellent, and numerical aperture is big, facilitates bright
The raising of degree.
2, a kind of the last one eyeglass of Miniature projection lens of the application uses Glass aspheric, compared with prior art
Plastic cement is aspherical, effectively improves the burnt problem of the heated race of minitype projection machine；And first eyeglass be plastic aspherical element, can be effective
Reduce cost.
3, the application is adapted to the display of a variety of resolution ratio, while being also applicable in a variety of image source displaying schemes, such as DMD, swashs
Light, LCOS, LCD etc..
4, a kind of structure of Miniature projection lens of the embodiment of the present application has the biggish margin of tolerance, improves the volume production of camera lens
Yield.
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 (10)
1. a kind of Miniature projection lens, which is characterized in that the camera lens successively includes: that the first group is saturating from amplification end to end is reduced
Mirror, diaphragm, second group's lens shake device, and light-splitting device protects glass and imaging surface；First group lens are negative
Focal length, second group lens are positive focal length.
2. a kind of Miniature projection lens according to claim 1, which is characterized in that the focal length of first group lens is
317<f9<320；The focal length of second group lens is 17.25 < f10 < 19.35.
3. a kind of Miniature projection lens according to claim 2, which is characterized in that first group lens include successively
The first eyeglass, the second eyeglass and the third eyeglass of arrangement.
4. a kind of Miniature projection lens according to claim 3, which is characterized in that first eyeglass is with negative focal length
Convex-concave plastic aspheric lens；Second eyeglass is the double concave type glass lens with negative focal length；The third eyeglass
For the biconvex glass lens with positive focal length.
5. a kind of Miniature projection lens according to claim 4, which is characterized in that two surfaces of first eyeglass are equal
For aspherical and described first camera lens concave surface towards aperture of the diaphragm direction；Two surfaces of second eyeglass are spherical surface and song
The biggish surface of rate is backwards to aperture diaphragm；Two surfaces of the third eyeglass are spherical surface and curvature is identical.
6. a kind of Miniature projection lens according to claim 5, which is characterized in that the focal length of first eyeglass be-
18.32<f1<-16.32；The focal length of second eyeglass is -37.85 < f2 < -35.82；The focal length of the third eyeglass is
22.25<f3<24.25。
7. a kind of Miniature projection lens according to claim 2, which is characterized in that second group lens include successively
The 4th eyeglass, the 5th eyeglass, the 6th eyeglass, the 7th eyeglass and the 8th eyeglass of arrangement.
8. a kind of Miniature projection lens according to claim 7, which is characterized in that the 4th eyeglass is with negative focal length
Double concave type glass lens；5th eyeglass is the biconvex glass lens with positive focal length；6th eyeglass be with
The concave-convex type glass lens of negative focal length；7th eyeglass is the biconvex glass lens with positive focal length；8th eyeglass
For the biconvex glass lens with positive focal length.
9. a kind of Miniature projection lens according to claim 8, which is characterized in that two surfaces of the 4th eyeglass are equal
For spherical surface and the biggish surface of curvature is towards aperture diaphragm；Two surfaces of the 5th eyeglass are spherical surface and curvature is biggish
Surface is towards aperture diaphragm；Two surfaces of the 6th eyeglass are spherical surface and facing towards aperture diaphragm；7th mirror
Two surfaces of piece are spherical surface and the lesser surface of curvature towards aperture diaphragm；Two surfaces of the 8th eyeglass are non-
Spherical surface and more curved surface are towards aperture diaphragm.
10. a kind of Miniature projection lens according to claim 9, which is characterized in that the focal length of the 4th eyeglass be-
21.58<f4<-19.58；The focal length of 5th eyeglass is 12.25 < f5 < 14.25；The focal length of 6th eyeglass is -23.35
<f6<-21.35；The focal length of 7th eyeglass is 26.55 < f7 < 28.55；The focal length of 8th eyeglass be 38.45 < f8 <
40.45。
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| CN201822254758.4U CN209311772U (en) | 2018-12-29 | 2018-12-29 | A kind of Miniature projection lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822254758.4U CN209311772U (en) | 2018-12-29 | 2018-12-29 | A kind of Miniature projection lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491053A (en) * | 2018-12-29 | 2019-03-19 | 深圳市点睛创视技术有限公司 | A kind of Miniature projection lens |
| 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 |
| CN113419329A (en) * | 2021-05-31 | 2021-09-21 | 歌尔光学科技有限公司 | Optical system and projection equipment |
-
2018
- 2018-12-29 CN CN201822254758.4U patent/CN209311772U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491053A (en) * | 2018-12-29 | 2019-03-19 | 深圳市点睛创视技术有限公司 | A kind of Miniature projection lens |
| CN109491053B (en) * | 2018-12-29 | 2024-04-26 | 深圳市点睛创视技术有限公司 | Miniature projection lens |
| 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 |
| CN113419329A (en) * | 2021-05-31 | 2021-09-21 | 歌尔光学科技有限公司 | Optical system and projection equipment |
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