CN208334760U - projection lens - Google Patents
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- CN208334760U CN208334760U CN201821128651.9U CN201821128651U CN208334760U CN 208334760 U CN208334760 U CN 208334760U CN 201821128651 U CN201821128651 U CN 201821128651U CN 208334760 U CN208334760 U CN 208334760U
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Abstract
The utility model discloses a kind of projection lens, and including including set on the reflecting mirror and lens subassembly between dmd chip and perspective plane, lens subassembly is set between reflecting mirror and dmd chip；Lens subassembly successively includes the first positive meniscus lens, the second positive meniscus lens, the first diverging meniscus lens, third positive meniscus lens, the first convex lens, cemented doublet, the second convex lens, three balsaming lens, third convex lens and the 4th convex lens；The projected light beam of dmd chip modulation passes sequentially through lens subassembly and reflecting mirror and is imaged on the projection surface.It is 2.4 that the application, which provides a F-number, and a distortion is less than 1.5%, and focal length is the projection lens of 4.8mm, this camera lens is a precise structure, control low cost, the image-forming objective lens of smaller size smaller.The image planes that diagonal line is 60 inches are formed in the position 0.55m after above-mentioned projection lens.
Description
Technical field
The utility model relates to projection field more particularly to a kind of 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.The utility model designs camera lens using aspherical lens, reaches aspherical possessed higher clarity and TV
Distortion requires.
Projected picture is generally projected directly on screen using non-spherical reflector by ultrashort zoom lens design, but heavy caliber
Non-spherical reflector processing it is more difficult, it is difficult to industrialization.And the effect of screen is projected directly into not using spherical reflector
It is ideal.F number, that is, F-number of the projection lens of existing projector is higher, can reduce picture again while if reducing F number
Clarity.
Utility model content
For overcome the deficiencies in the prior art, one of the purpose of this utility model is to provide a kind of projection lens, energy
Solve the problems, such as that lens effect is undesirable.
One of the purpose of this utility model adopts the following technical scheme that realization:
A kind of projection lens, it is described including including the reflecting mirror and lens subassembly being set between dmd chip and perspective plane
Mirror assembly is set between the reflecting mirror and dmd chip；The lens subassembly is arranged from reflecting mirror to dmd chip with optical axis, institute
It is saturating to state lens subassembly successively and include the first positive meniscus lens, the second positive meniscus lens, the first diverging meniscus lens, the positive bent moon of third
Mirror, the first convex lens, cemented doublet, the second convex lens, three balsaming lens, third convex lens and the 4th convex lens；The DMD
The projected light beam of chip modulation passes sequentially through lens subassembly and reflecting mirror and is imaged on the projection surface.
Further, the projection lens further includes prism group, diaphragm and galvanometer, and the prism group is set to the DMD core
Between piece and the galvanometer, the diaphragm is set to cemented doublet and the second convex lens.
Further, the reflecting mirror is spherical reflector, and the spherical reflector includes a concave surface, the concave surface direction
First positive meniscus lens.
Further, the mirror curvature radius is between 20mm and 60mm；
The focal length of first positive meniscus lens is between 50mm and 70mm；
The focal length of second positive meniscus lens is between 190mm and 240mm；
The focal length of first diverging meniscus lens is between -300mm and -400mm；
The focal length of the third positive meniscus lens is between 110mm and 150mm；
The focal length of first convex lens is between 110mm and 150mm；
The focal length of the cemented doublet is between 150mm and 200mm；
The focal length of second convex lens is between 50mm and 75mm；
The focal length of three balsaming lens is between -50mm and -40mm；
The focal length of the third convex lens is between 60mm and 80mm；
The focal length of 4th convex lens is between 30mm and 50mm.
Further, the cemented doublet includes the first concavees lens and the 5th convex lens, and first concavees lens are close
First convex lens, the 5th convex lens close to second convex lens, the refractive index of first concavees lens between 1.70 with
Between 1.80；The refractive index of 5th convex lens is between 1.50 and 1.65.
Further, three balsaming lens includes the second concavees lens, third concavees lens and the 6th convex lens, the third
Concavees lens are between second concavees lens and the 6th convex lens, and second concavees lens are close to second convex lens
Mirror, close to the third convex lens between the 6th convex lens；
The refractive index of first positive meniscus lens is between 1.50 and 1.60；
The refractive index of second positive meniscus lens is between 1.55 and 1.65；
The refractive index of first diverging meniscus lens is between 1.50 and 1.60；
The refractive index of the third positive meniscus lens is between 1.90 and 2.00；
The refractive index of 6th convex lens is between 1.55 and 1.70；
The refractive index of second convex lens is between 1.55 and 1.70；
The refractive index of first convex lens is between 1.50 and 1.60；
The refractive index of second concavees lens is between 1.65 and 1.75；
The refractive index of the third concavees lens is between 1.75 and 1.90；
The refractive index of the third convex lens is between 1.55 and 1.70；
The refractive index of 4th convex lens is between 1.55 and 1.70.
Further, first positive meniscus lens.
Further, described first diverging meniscus lens or so two sides is aspherical.
Further, it is 1920 × 1080 or 0.48 inches of resolution ratio 1920 that the dmd chip, which is 0.47 inch of resolution ratio,
×1200。
Further, the dmd chip is vertical with the optical axis of the lens subassembly；The center of the projection lens is described
Except the region of dmd chip.
Compared with prior art, the utility model has the beneficial effects that:
It is 2.4 that the application, which provides a F-number, and less than 1.5%, focal length is the projection lens of 4.8mm for a distortion, this
Camera lens is a precise structure, control low cost, the image-forming objective lens of smaller size smaller.In the position 0.55m shape after above-mentioned projection lens
The image planes that pairs of linea angulata is 60 inches.The application is to be based on optical imaging concept, anti-to projection objective using optical design software
The optimization design that structure reaches aberration is carried out again.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and being implemented in accordance with the contents of the specification, and in order to allow the above and other purpose, feature of the utility model
It can be more clearly understood with advantage, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the schematic diagram of a preferred embodiment in the utility model projection lens；
Fig. 2 is the schematic diagram of one or three balsaming lens in projection lens shown in Fig. 1；
Fig. 3 is the schematic diagram that the utility model projects off axis；
Fig. 4 is the XPR technology picture drawing of the utility model；
Fig. 5 is the MTF curve figure of the utility model；
Fig. 6 is the point range figure of the utility model.
In figure: 100, projection lens；1, reflecting mirror；2, dmd chip；3, lens subassembly；31, the first positive meniscus lens；32,
Second positive meniscus lens；33, the first diverging meniscus lens；34, third positive meniscus lens；35, the first convex lens；36, double glued saturating
Mirror；361, the first concavees lens；362, the 5th convex lens；37, the second convex lens；38, three balsaming lens；381, the second concavees lens；
382, third concavees lens；383, the 6th convex lens；39, third convex lens；391, the 4th convex lens；4, prism group；5, window glass
Glass；6, diaphragm；7, perspective plane；8, galvanometer.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
It should be noted that it can be directly on another component when component is referred to as " being fixed on " another component
Or there may also be components placed in the middle.When a component is considered as " connection " another component, it, which can be, is directly connected to
To another component or it may be simultaneously present component placed in the middle.When a component is considered as " being set to " another component, it
It can be and be set up directly on another component or may be simultaneously present component placed in the middle.Term as used herein is " vertical
", " horizontal ", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein includes
Any and all combinations of one or more related listed items.
A kind of projection lens 100 includes including set on dmd chip 2 referring to FIG. 1-2) and perspective plane 7 between reflecting mirror
1, lens subassembly 3, prism group 4, window glass 5, diaphragm 6 and galvanometer 8.
The reflecting mirror 1 is spherical reflector, and the spherical reflector includes a concave surface, and the concave surface is just curved towards first
Month lens 31.
The lens subassembly 3 successively includes the first positive meniscus lens 31, the second positive meniscus lens 32, the first diverging meniscus lens
33, third positive meniscus lens 34, the first convex lens 35, cemented doublet 36, the second convex lens 37, three balsaming lens 38, third
Convex lens 39 and the 4th convex lens 391；The projected light beam that the dmd chip 2 is modulated passes sequentially through lens subassembly 3 and reflecting mirror 1
And it is imaged on perspective plane 7.
The cemented doublet 36 includes the first concavees lens 361 and the 5th convex lens 362, and first concavees lens 361 lean on
Nearly first convex lens 35, the 5th convex lens 362 is close to second convex lens 37, the refraction of first concavees lens 361
Rate is between 1.70 and 1.80；The refractive index of 5th convex lens 362 is between 1.50 and 1.65.
Three balsaming lens 38 includes the second concavees lens 381, third concavees lens 382 and the 6th convex lens 383, and described the
For three concavees lens 382 between second concavees lens 381 and the 6th convex lens 383, second concavees lens 381 are close
Second convex lens 37, close to the third convex lens 39 between the 6th convex lens 383.
1 radius of curvature of reflecting mirror between 20mm and 60mm, the focal length of first positive meniscus lens 31 between
Between 50mm and 70mm, the focal length of second positive meniscus lens 32 is between 190mm and 240mm, the first negative bent moon
The focal length of lens 33 is between -300mm and -400mm, and the focal length of the third positive meniscus lens 34 is between 110mm and 150mm
Between, the focal length of first convex lens 35 between 110mm and 150mm, the focal length of the cemented doublet 36 between
Between 150mm and 200mm, the focal length of second convex lens 37 between 50mm and 75mm, three balsaming lens 38
Focal length is between -50mm and -40mm, and for the focal length of the third convex lens 39 between 60mm and 80mm, the described 4th is convex
The focal length of lens 391 is between 30mm and 50mm.
The refractive index of first positive meniscus lens 31 between 1.50 and 1.60, second positive meniscus lens 32
For refractive index between 1.55 and 1.65, the refractive index of first diverging meniscus lens 33 is described between 1.50 and 1.60
The refractive index of third positive meniscus lens 34 is between 1.90 and 2.00, and the refractive index of the 6th convex lens 383 is between 1.55
Between 1.70, the refractive index of second convex lens 37 is between 1.55 and 1.70, the refraction of first convex lens 35
Rate is between 1.50 and 1.60, and for the refractive index of second concavees lens 381 between 1.65 and 1.75, the third is recessed
The refractive index of mirror 382 is between 1.75 and 1.90, and the refractive index of the third convex lens 39 is between 1.55 and 1.70, institute
The refractive index of the 4th convex lens 391 is stated between 1.55 and 1.70.
When assembling the projection lens 100, the lens subassembly 3 is set between the reflecting mirror 1 and dmd chip 2；It is described
Lens subassembly 3 is arranged from reflecting mirror 1 to dmd chip 2 with optical axis, and the prism group 4 is set to the dmd chip 2 and the galvanometer 8
Between, the diaphragm 6 is set to cemented doublet 36 and the second convex lens 37, it is preferred that the dmd chip 2 and the lens group
The optical axis of part 3 is vertical；The center of the projection lens is except the region of the dmd chip 2.The window glass 5 is located at institute
It states between prism group 4 and dmd chip 2.
It is 2.4 that the application, which provides a F-number, and less than 1.5%, focal length is the projection lens of 4.8mm for a distortion, this
Camera lens is a precise structure, control low cost, the image-forming objective lens of smaller size smaller.In the position 0.55m shape after above-mentioned projection lens
The image planes that pairs of linea angulata is 60 inches.The application is to be based on optical imaging concept, anti-to projection objective using optical design software
The optimization design that structure reaches aberration is carried out again, and image quality is fine, structure novel, ingenious in design, strong applicability, convenient for promoting.
It should be noted that first positive meniscus lens 31,33 or so the two sides of the first diverging meniscus lens is aspheric
Face, the dmd chip 2 are that 0.47 inch of resolution ratio is 1920 × 1080 or 0.48 inches of resolution ratio 1920 × 1200.
It modifies, reaches to the excellent of aberration to the spacing between the radius of curvature of each lens, material, thickness and lens
Change.
It is to provide a kind of projection lens optical system embodiment of the utility model for 0.47 inch of dmd chip below
Parameter.
Asphericity coefficient:
| Surface serial number | x2 | x4 | x6 | x8 |
| 2 | 0 | -7.59202E-05 | -7.59040E-08 | 1.33327E-10 |
| 3 | 0 | -4.94294E-05 | -2.22998E-08 | 2.95270E-11 |
| 6 | 0 | -2.78947E-05 | -1.65620E-09 | 1.25261E-11 |
| 7 | 0 | -2.42835E-05 | 9.70998E-09 | -2.74202E-12 |
Finally obtain focal length 4.8mm, optical tube length 217mm, F2.4, distort less than 1.5%, 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 0.55m.
Referring to Fig. 3, for the schematic diagram that the utility model projects off axis, referring to Fig. 4, being the use of the utility model
XPR technology picture drawing.So that 45 degree of directions of pixel is deviated half-pixel by galvanometer 8 and a pixel is presented again, to make
Pixel quantity is double.Diamond shape arrangement is presented in pixel, and the hypotelorism of pixel center is two/radical sign two, i.e. pixel size is
3.81um。
Referring to Fig. 5, be the MTF curve figure of the utility model, in figure under 131lp/mm the MTF curve of each visual field it is compact at
It is a branch of to be greater than 0.43, illustrate that the lens imaging picture is clearly uniform.1920 × 1,200 0.48 chip and 1920 × 1080
The pixel of 0.47 chip is 5.4 microns, and corresponding Kui Nisi line is satisfaction to lower numerical value > 0.57 MTF in the line to being 93lp/mm
The resolution requirement of the chip.After XPR technology, pixel becomes 3.81um, and corresponding Kui Nisi line is to for 131lp/mm, MTF
Numerical value decreases, and numerical value > 0.43 MTF is met the requirements, and imaging picture is same clear uniform.
Referring to Fig. 6, knowing from figure for the point range figure for being the utility model, the point range figure under each visual field is averaged disc of confusion
Radius is less than 4.6 microns.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (10)
1. a kind of projection lens, including the reflecting mirror and lens subassembly being set between dmd chip and perspective plane, it is characterised in that:
The lens subassembly is set between the reflecting mirror and dmd chip；The lens subassembly is set from reflecting mirror to dmd chip with optical axis
It sets, the lens subassembly successively includes that the first positive meniscus lens, the second positive meniscus lens, the first diverging meniscus lens, third are just curved
Month lens, the first convex lens, cemented doublet, the second convex lens, three balsaming lens, third convex lens and the 4th convex lens；Institute
The projected light beam for stating dmd chip modulation passes sequentially through lens subassembly and reflecting mirror and is imaged on the projection surface.
2. projection lens as described in claim 1, it is characterised in that: the projection lens further includes prism group, diaphragm and vibration
Mirror, the prism group are set between the dmd chip and the galvanometer, and the diaphragm is set to cemented doublet and the second convex lens
Mirror.
3. projection lens as described in claim 1, it is characterised in that: the reflecting mirror is spherical reflector, and the spherical surface is anti-
Penetrating mirror includes a concave surface, the first positive meniscus lens of the concave surface direction.
4. projection lens a method according to any one of claims 1-3, it is characterised in that:
The mirror curvature radius is between 20mm and 60mm；
The focal length of first positive meniscus lens is between 50mm and 70mm；
The focal length of second positive meniscus lens is between 190mm and 240mm；
The focal length of first diverging meniscus lens is between -300mm and -400mm；
The focal length of the third positive meniscus lens is between 110mm and 150mm；
The focal length of first convex lens is between 110mm and 150mm；
The focal length of the cemented doublet is between 150mm and 200mm；
The focal length of second convex lens is between 50mm and 75mm；
The focal length of three balsaming lens is between -50mm and -40mm；
The focal length of the third convex lens is between 60mm and 80mm；
The focal length of 4th convex lens is between 30mm and 50mm.
5. projection lens as claimed in claim 4, it is characterised in that: the cemented doublet includes the first concavees lens and the 5th
Convex lens, first concavees lens are close to the first convex lens, and the 5th convex lens is close to second convex lens, and described first
The refractive index of concavees lens is between 1.70 and 1.80；The refractive index of 5th convex lens is between 1.50 and 1.65.
6. projection lens as claimed in claim 5, it is characterised in that: three balsaming lens includes the second concavees lens, third
Concavees lens and the 6th convex lens, the third concavees lens are described between second concavees lens and the 6th convex lens
Second concavees lens are between second convex lens, the 6th convex lens close to the third convex lens；
The refractive index of first positive meniscus lens is between 1.50 and 1.60；
The refractive index of second positive meniscus lens is between 1.55 and 1.65；
The refractive index of first diverging meniscus lens is between 1.50 and 1.60；
The refractive index of the third positive meniscus lens is between 1.90 and 2.00；
The refractive index of 6th convex lens is between 1.55 and 1.70；
The refractive index of second convex lens is between 1.55 and 1.70；
The refractive index of first convex lens is between 1.50 and 1.60；
The refractive index of second concavees lens is between 1.65 and 1.75；
The refractive index of the third concavees lens is between 1.75 and 1.90；
The refractive index of the third convex lens is between 1.55 and 1.70；
The refractive index of 4th convex lens is between 1.55 and 1.70.
7. projection lens as described in claim 1, it is characterised in that: first positive meniscus lens.
8. projection lens as described in claim 1, it is characterised in that: described first diverging meniscus lens or so two sides is aspheric
Face.
9. projection lens as described in claim 1, it is characterised in that: the dmd chip is that 0.47 inch of resolution ratio is 1920
× 1080 or 0.48 inches of resolution ratio 1920 × 1200.
10. projection lens as described in claim 1, it is characterised in that: the optical axis of the dmd chip and the lens subassembly hangs down
Directly；The center of the projection lens is except the region of the dmd chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821128651.9U CN208334760U (en) | 2018-07-17 | 2018-07-17 | projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821128651.9U CN208334760U (en) | 2018-07-17 | 2018-07-17 | projection lens |
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| Publication Number | Publication Date |
|---|---|
| CN208334760U true CN208334760U (en) | 2019-01-04 |
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ID=64784125
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|---|---|---|---|
| CN201821128651.9U Active CN208334760U (en) | 2018-07-17 | 2018-07-17 | projection lens |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710194A (en) * | 2018-07-17 | 2018-10-26 | 安徽仁和光电科技有限公司 | Projection lens |
| CN110646918A (en) * | 2019-08-22 | 2020-01-03 | 广景视睿科技（深圳）有限公司 | Projection lens |
| CN110673306A (en) * | 2019-10-09 | 2020-01-10 | 安徽仁和光电科技有限公司 | Small-size full high definition short-focus projection lens |
| CN111474816A (en) * | 2019-01-23 | 2020-07-31 | 青岛海信激光显示股份有限公司 | Laser projection device |
-
2018
- 2018-07-17 CN CN201821128651.9U patent/CN208334760U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710194A (en) * | 2018-07-17 | 2018-10-26 | 安徽仁和光电科技有限公司 | Projection lens |
| CN108710194B (en) * | 2018-07-17 | 2024-02-02 | 安徽仁和光电科技有限公司 | Projection lens |
| CN111474816A (en) * | 2019-01-23 | 2020-07-31 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN110646918A (en) * | 2019-08-22 | 2020-01-03 | 广景视睿科技（深圳）有限公司 | Projection lens |
| CN110646918B (en) * | 2019-08-22 | 2020-12-22 | 广景视睿科技（深圳）有限公司 | Projection lens |
| CN110673306A (en) * | 2019-10-09 | 2020-01-10 | 安徽仁和光电科技有限公司 | Small-size full high definition short-focus projection lens |
| CN110673306B (en) * | 2019-10-09 | 2021-07-30 | 安徽仁和光电科技有限公司 | Small-size full high definition short-focus projection lens |
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