CN208969323U - A kind of small-sized high definition ultra-short focus projection lens - Google Patents
A kind of small-sized high definition ultra-short focus projection lens Download PDFInfo
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- CN208969323U CN208969323U CN201821546808.XU CN201821546808U CN208969323U CN 208969323 U CN208969323 U CN 208969323U CN 201821546808 U CN201821546808 U CN 201821546808U CN 208969323 U CN208969323 U CN 208969323U
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Abstract
The utility model discloses a kind of small-sized high definition ultra-short focus projection lens, focal length is between 2mm and 2.5mm, lens subassembly and reflecting mirror including several coaxial arrangements being set between perspective plane and dmd chip, several the coaxial distributing orders of the lens subassembly between reflecting mirror to dmd chip include the first positive meniscus lens, the second positive meniscus lens, the first concavees lens, the first convex lens, the second convex lens, cemented doublet, three balsaming lens, third convex lens；The projected light beam of the dmd chip modulation passes sequentially through the lens subassembly and the reflecting mirror and is imaged on the perspective plane.The utility model uses special lens arrangement and spherical reflector, preceding two panels lens transmit twice by positive and negative, and eyeglass number needed for not only reducing camera lens significantly reduces camera lens volume, it can apply and small projection equipment, and higher clarity and TV distortion possessed by reaching aspherical require.
Description
Technical field
The utility model belongs to photoelectricity projection art more particularly to a kind of small-sized high definition ultra-short focus projection lens.
Background technique
The projector of higher pixel generally uses aspherical projection lens at present, and clarity and TV distortion require to compare appearance
Easily meet.Projected picture is generally projected directly on screen using non-spherical reflector by ultra-short focus projection lens design, but big
The processing of the non-spherical reflector of bore is more difficult, it is difficult to industrialization.And the effect of screen is projected directly into using spherical reflector
It is again undesirable.Meanwhile F number, that is, F-number of the projection lens of existing projector is higher, can drop again while if reducing F number
The clarity of low picture.
Furthermore existing ultrashort zoom lens design contains multiple eyeglass numbers, has biggish camera lens volume, it is difficult to adapt to
The demand of existing small projection equipment.
Utility model content
For overcome the deficiencies in the prior art, the utility model use special lens arrangement and spherical reflector, preceding two
Piece lens are transmitted twice by positive and negative, and eyeglass number needed for not only reducing camera lens significantly reduces camera lens volume, can using with
Small projection equipment, and reach aspherical possessed higher clarity and TV distortion requirement.
The utility model the following technical schemes are provided: a kind of small-sized high definition ultra-short focus projection lens, focal length be 2mm with
Between 2.5mm, lens subassembly and reflecting mirror including several coaxial arrangements being set between perspective plane and dmd chip are described
Several the coaxial distributing orders of lens subassembly between reflecting mirror to dmd chip include the first positive meniscus lens, second just curved
Month lens, the first concavees lens, the first convex lens, the second convex lens, cemented doublet, three balsaming lens, third convex lens；It is described
The projected light beam of dmd chip modulation passes sequentially through the lens subassembly and the reflecting mirror and is imaged on the perspective plane.
Preferably, the small-sized high definition ultra-short focus projection lens further include be set to dmd chip and third convex lens it
Between prism group.
Further, the small-sized high definition ultra-short focus projection lens also include be placed in cemented doublet and three balsaming lens it
Between diaphragm.
Further, the reflecting mirror is spherical reflector, an including concave surface, and the concave surface is towards the described first positive bent moon
Lens.
Further, the dmd chip is 0.3 inch, and resolution ratio is 1280 × 720 and 0.33 inch 1368 × 768.
Further, optical axis of the dmd chip perpendicular to the lens subassembly, chip center's deviation optical center, core
Piece long side is vertical with off-axis and optical center is except chip area.
Further, the mirror curvature radius is between 15mm and 40mm；The coke of first positive meniscus lens
Away between 50mm and 75mm；Between the focal length of second positive meniscus lens is infinite between 300mm and just；Described first is recessed
The focal length of lens is between -30mm and -10mm；The focal length of first convex lens is between 30mm and 50mm；Described
The focal length of two convex lenses is between 40mm and 65mm；The focal length of the cemented doublet is between 60mm and 80mm；It is described
The focal length of three balsaming lens is between 20mm and 35mm；The focal length of the third convex lens is between 20mm and 40mm.
Further, the refractive index of first positive meniscus lens is between 1.45 and 1.60；The second positive bent moon
The refractive index of lens is between 1.55 and 1.75；The refractive index of first concavees lens is between 1.45 and 1.60；It is described
The refractive index of first convex lens is between 1.75 and 1.90；The refractive index of second convex lens between 1.60 and 1.75 it
Between；In the cemented doublet, the refractive index of the concavees lens of close second convex lens is between 1.65 and 1.75, close to diaphragm
Convex lens refractive index between 1.50 and 1.60；In three balsaming lens, the refractive index close to the convex lens of diaphragm is situated between
Between 1.45 and 1.55, the refractive index of intermediate concavees lens is between 1.75 and 1.85, close to the convex lens of third convex lens
Mirror refractive index is between 1.65 and 1.75；The refractive index of the third convex lens is between 1.65 and 1.80.
Further, first positive meniscus lens and the first concavees lens or so two sides are aspherical.
The utility model has the following beneficial effects:
1, using diaphragm as boundary, group eyeglass is born preceding, is just organizing posterior retrofocus type object lens, wherein positive group is divided by two again
The A group of secondary transmission and only by the B group that is projected with this, imagines construction A group, B group and negative group respectively with several mirrors according to this configuration
Piece replaces composition initial configuration, changes chip size, passes through the optimization of replacement increase and decrease glass material, focal length scaling and aberration control
Design is finally reached the excellent projection lens design of image quality；
2, using special lens arrangement and spherical reflector, preceding two panels lens are transmitted twice by positive and negative, are not only reduced
Eyeglass number needed for camera lens, significantly reduces camera lens volume, can apply and small projection equipment, and reaches aspherical and had
Higher clarity and TV distortion require；
3, the F-number 2.4 of small-sized high definition ultra-short focus projection lens provided by the present application distorts less than 1%, and focal length is
Between 2mm and 2.5mm, precise structure, control low cost is the image-forming objective lens of smaller size smaller, in 0.38m after said lens system
Position forms the image planes that diagonal line is 60 inches；
4, the application is repeatedly to be carried out structure to projection objective using optical design software based on optical imaging concept and reached
To the optimization design of aberration.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the image projection schematic diagram of the utility model；
Fig. 3 is the MTF curve figure of the utility model type；
Fig. 4 is the point range figure of the utility model.
In figure: 1, reflecting mirror；2, dmd chip；3, lens subassembly；31, the first positive meniscus lens；32, the second positive bent moon is saturating
Mirror；33, the first concavees lens；34, the first convex lens；35, the second convex lens；36, cemented doublet；361, the second concavees lens；
362, the 4th convex lens；37, three balsaming lens；371, the 5th convex lens；372, third concavees lens；373, the 6th convex lens；38,
Third convex lens；4, prism group；5, window glass；6, diaphragm；7, perspective plane.
Specific embodiment
Specific embodiment of the present utility model is further illustrated in conjunction with attached drawing.
As shown in Figure 1, the utility model provides a kind of small-sized high definition ultra-short focus projection lens, including it is set to DMD chip 2
Reflecting mirror 1, lens subassembly 3, prism group 4, window glass 5, diaphragm 6 and perspective plane 7 between perspective plane 7.
The reflecting mirror is spherical reflector, an including concave surface, and the concave surface is towards first positive meniscus lens 31.
The dmd chip is 0.3 inch, and resolution ratio is 1280 × 720 and 0.33 inch 1368 × 768；DMD chip hangs down
Directly in the optical axis of the lens subassembly, chip center deviates optical center, and chip long side is vertical with off-axis and optical center exists
Except chip area.
Several the coaxial distributing orders of the lens subassembly between reflecting mirror to dmd chip include that the first positive bent moon is saturating
Mirror 31, the second positive meniscus lens 32, the first concavees lens 33, the first convex lens 34, the second convex lens 35, cemented doublet 36, three
Balsaming lens 37, third convex lens 38.
Specifically, the mirror curvature radius is between 15mm and 40mm；The focal length of first positive meniscus lens
Between 50mm and 75mm；Between the focal length of second positive meniscus lens is infinite between 300mm and just；Described first is recessed
The focal length of mirror is between -30mm and -10mm；The focal length of first convex lens is between 30mm and 50mm；Described second
The focal length of convex lens is between 40mm and 65mm；The focal length of the cemented doublet is between 60mm and 80mm；Described three
The focal length of balsaming lens is between 20mm and 35mm；The focal length of the third convex lens is between 20mm and 40mm.
The cemented doublet 36 includes the second concavees lens 361 and the 4th convex lens 362, and second concavees lens 361 lean on
Nearly 5th convex lens 35, for the 4th convex lens 362 close to three balsaming lens 37, three balsaming lens 37 includes the 5th
Convex lens 371, third concavees lens 372 and the 6th convex lens 373, the 5th convex lens 371 are convex close to diaphragm 6, the described 6th
Lens 373 are close to third convex lens 38.
The refractive index of first positive meniscus lens is between 1.45 and 1.60；The refraction of second positive meniscus lens
Rate is between 1.55 and 1.75；The refractive index of first concavees lens is between 1.45 and 1.60；First convex lens
Refractive index between 1.75 and 1.90；The refractive index of second convex lens is between 1.60 and 1.75；Double glue
It closes in lens, the refractive index of the second concavees lens of close second convex lens is between 1.65 and 1.75, close to the 4th of diaphragm the
Convex lens refractive index is between 1.50 and 1.60；In three balsaming lens, close to the refractive index of the 5th convex lens of diaphragm
Between 1.45 and 1.55, the refractive index of intermediate third concavees lens is between 1.75 and 1.85, close to third convex lens
The 6th convex lens refractive index between 1.65 and 1.75；The refractive index of the third convex lens between 1.65 and 1.80 it
Between.
It should be noted that wherein the first positive meniscus lens and the first concavees lens or so two sides are aspherical.To each lens
Radius of curvature, material, the spacing between thickness and lens modify, reach the optimization to aberration.
It is to provide a kind of projection lens optical system embodiment of the utility model for 0.33 inch of dmd chip below
Parameter.
Asphericity coefficient:
| Surface | x2 | x4 | x6 | x8 |
| 2 | 0 | -7.98202E-05 | -2.33186E-07 | -3.68165E-10 |
| 3 | 0 | -1.53945E-04 | 1.37197E-06 | -2.74149E-09 |
| 6 | 0 | -3.31711E-05 | 8.21825E-07 | -1.39412E-09 |
| 7 | 0 | -3.91949E-06 | 1.58385E-07 | 1.03174E-09 |
Finally obtain focal length 2.27mm, optical tube length 100mm, F2.4, distort less than 1%, each visual field image quality uniformly and
The optimal ultra-short focus projection lens of image quality.The utility model, which is realized, forms the image planes that diagonal line is 60 inches in the position 0.38m.
If Fig. 2 is the schematic diagram that the utility model projects off axis.
As Fig. 3 be each visual field under 93lp/mm in the MTF curve figure figure of the utility model MTF curve it is compact at a branch of big
In 0.51, illustrate that the lens imaging picture is clearly uniform.The pixel of 1368 × 768 0.33 chip is 5.4 microns, corresponding Kui Buddhist nun
This line is the resolution requirement for meeting the chip to lower numerical value > 0.51 MTF in the line to for 93lp/mm.0.3 chip is less than
0.33 chip, pixel are equally 5.4 microns, and corresponding Kui Nisi line expires lower numerical value > 0.51 MTF in the line to being 93lp/mm
The resolution requirement of the foot chip.
If Fig. 4 is the point range figure of the application, Cong Tuzhong knows, the point range figure under each visual field is averaged disc of confusion radius less than 5.3
Micron, image quality are fine.
When assembling the small-sized high definition ultra-short focus projection lens, the lens subassembly 3 is set to the reflecting mirror 1 and described
Between dmd chip 2；The lens subassembly 3 is arranged from the reflecting mirror 1 and the dmd chip 2 with optical axis, and the prism group 4 is set
Between the dmd chip 2 and the third convex lens 38, the diaphragm 6 is set to the cemented doublet 36 and three glue
It closes between lens 37.The dmd chip 2 is perpendicular to the optical axis of the lens subassembly 3, and the center of the projection lens is described
Except the region of dmd chip 2.The projected light beam that the DMD chip 2 is modulated passes sequentially through the lens subassembly 3 and the reflection
Mirror 1 is simultaneously imaged on the perspective plane 7.
Above-mentioned small-sized high definition ultra-short focus projection lens use special lens arrangement and spherical reflector, preceding two panels lens warp
Cross it is positive and negative transmit twice, eyeglass number needed for not only reducing camera lens significantly reduces camera lens volume, can apply and compact projection
Equipment, and reach aspherical possessed higher clarity and TV distortion requirement.
Claims (10)
1. a kind of small-sized high definition ultra-short focus projection lens, which is characterized in that focal length is between 2mm and 2.5mm, including is set to projection
The lens subassembly and reflecting mirror of several coaxial arrangements between face and dmd chip, the lens subassembly is from reflecting mirror to DMD core
Several coaxial distributing orders between piece include the first positive meniscus lens, the second positive meniscus lens, the first concavees lens, first convex
Lens, the second convex lens, cemented doublet, three balsaming lens, third convex lens；The projected light beam of dmd chip modulation according to
It is secondary to be imaged through the lens subassembly and the reflecting mirror and on the perspective plane.
2. small-sized high definition ultra-short focus projection lens according to claim 1, which is characterized in that the small-sized ultrashort coke of high definition
Projection lens further includes the prism group being set between dmd chip and third convex lens.
3. small-sized high definition ultra-short focus projection lens according to claim 1, which is characterized in that the small-sized ultrashort coke of high definition
Projection lens also includes the diaphragm being placed between cemented doublet and three balsaming lens.
4. small-sized high definition ultra-short focus projection lens according to claim 1, which is characterized in that the cemented doublet includes
Second concavees lens and the 4th convex lens, second concavees lens are close to the 5th convex lens, and the 4th convex lens is close to described three
Balsaming lens, three balsaming lens include the 5th convex lens, third concavees lens and the 6th convex lens, and the 5th convex lens leans on
Dipped beam door screen, the 6th convex lens is close to third convex lens.
5. small-sized high definition ultra-short focus projection lens according to claim 1, it is characterised in that: the reflecting mirror is that spherical surface is anti-
Penetrate mirror, including a concave surface, the concave surface is towards first positive meniscus lens.
6. small-sized high definition ultra-short focus projection lens according to claim 1, it is characterised in that: the dmd chip is 0.3 English
Very little, resolution ratio is 1280 × 720 and 0.33 inch 1368 × 768.
7. small-sized high definition ultra-short focus projection lens according to claim 1, it is characterised in that: the dmd chip perpendicular to
The optical axis of the lens subassembly, chip center deviate optical center, and chip long side is vertical with off-axis and optical center is in chip
Except region.
8. small-sized high definition ultra-short focus projection lens according to claim 1, it is characterised in that:
The mirror curvature radius is between 15mm and 40mm；
The focal length of first positive meniscus lens is between 50mm and 75mm；
Between the focal length of second positive meniscus lens is infinite between 300mm and just；
The focal length of first concavees lens is between -30mm and -10mm；
The focal length of first convex lens is between 30mm and 50mm；
The focal length of second convex lens is between 40mm and 65mm；
The focal length of the cemented doublet is between 60mm and 80mm；
The focal length of three balsaming lens is between 20mm and 35mm；
The focal length of the third convex lens is between 20mm and 40mm.
9. small-sized high definition ultra-short focus projection lens according to claim 4, it is characterised in that:
The refractive index of first positive meniscus lens is between 1.45 and 1.60；
The refractive index of second positive meniscus lens is between 1.55 and 1.75；
The refractive index of first concavees lens is between 1.45 and 1.60；
The refractive index of first convex lens is between 1.75 and 1.90；
The refractive index of second convex lens is between 1.60 and 1.75；
In the cemented doublet, the refractive index of the second concavees lens of close second convex lens is leaned between 1.65 and 1.75
4th convex lens refractive index of dipped beam door screen is between 1.50 and 1.60；
In three balsaming lens, close to diaphragm the 5th convex lens refractive index between 1.45 and 1.55, intermediate the
The refractive index of three concavees lens between 1.75 and 1.85, close to third convex lens the 6th convex lens refractive index between 1.65 with
Between 1.75；
The refractive index of the third convex lens is between 1.65 and 1.80.
10. small-sized high definition ultra-short focus projection lens according to claim 1, it is characterised in that: the first positive bent moon is saturating
Mirror and the first concavees lens or so two sides are aspherical.
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| CN201821546808.XU CN208969323U (en) | 2018-09-21 | 2018-09-21 | A kind of small-sized high definition ultra-short focus projection lens |
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| CN201821546808.XU CN208969323U (en) | 2018-09-21 | 2018-09-21 | A kind of small-sized high definition ultra-short focus projection lens |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001895A (en) * | 2018-09-21 | 2018-12-14 | 杭州有人光电技术有限公司 | A kind of small-sized high definition ultra-short focus projection lens |
| CN114253054A (en) * | 2020-09-22 | 2022-03-29 | 上旸光学股份有限公司 | Projection optical system |
| TWI782327B (en) * | 2020-09-18 | 2022-11-01 | 上暘光學股份有限公司 | Projection Optical System |
| CN115657275A (en) * | 2022-12-12 | 2023-01-31 | 沂普光电(天津)有限公司 | Ultra-short-focus projection lens and projection system |
-
2018
- 2018-09-21 CN CN201821546808.XU patent/CN208969323U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001895A (en) * | 2018-09-21 | 2018-12-14 | 杭州有人光电技术有限公司 | A kind of small-sized high definition ultra-short focus projection lens |
| CN109001895B (en) * | 2018-09-21 | 2024-05-31 | 杭州有人光电技术有限公司 | Small-sized high-definition ultra-short-focus projection lens |
| TWI782327B (en) * | 2020-09-18 | 2022-11-01 | 上暘光學股份有限公司 | Projection Optical System |
| CN114253054A (en) * | 2020-09-22 | 2022-03-29 | 上旸光学股份有限公司 | Projection optical system |
| CN115657275A (en) * | 2022-12-12 | 2023-01-31 | 沂普光电(天津)有限公司 | Ultra-short-focus projection lens and projection system |
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