CN108873259A - A kind of ultrashort full HD projection lens of coke - Google Patents
A kind of ultrashort full HD projection lens of coke Download PDFInfo
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- CN108873259A CN108873259A CN201810782211.3A CN201810782211A CN108873259A CN 108873259 A CN108873259 A CN 108873259A CN 201810782211 A CN201810782211 A CN 201810782211A CN 108873259 A CN108873259 A CN 108873259A
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- convex lens
- projection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The present invention relates to the projection arts in photoelectric display industry, disclose the ultra-short focus projection lens for the projector that one kind is used in as 1920 × 1080 and 1920 × 1,200 two.Projection lens provided by the invention, including the reflecting mirror and lens subassembly being set between dmd chip and perspective plane；Lens subassembly is set between reflecting mirror and dmd chip；Lens subassembly is arranged from reflecting mirror to dmd chip with optical axis, lens subassembly successively includes the first positive meniscus lens, the first cemented doublet, the first diverging meniscus lens, the second positive meniscus lens, the first convex lens, the first biconcave lens, second convex lens, third convex lens, the second cemented doublet, the 4th convex lens, the 5th 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.There is provided a F-number is 2.4, is distorted less than 1%, and focal length is the projection lens of 3.5mm；Precise structure, control low cost, the image-forming objective lens of smaller size smaller.
Description
Technical field
The present invention relates to the projection art in photoelectric display industry, more particularly to one kind be used in as 1920 ×
The ultra-short focus projection lens of 1080 and 1920 × 1,200 two projector.
Background technique
Currently, projected picture is generally projected directly into screen using non-spherical reflector by ultra-short focus projection lens design
On, but the processing of bigbore non-spherical reflector is more difficult, it is difficult to industrialization.And screen is projected directly into using spherical reflector
Effect again it is undesirable.Meanwhile F number, that is, F-number of the projection lens of existing projector is higher, if reduce F number
The clarity of picture can be reduced again.
Summary of the invention
For overcome the deficiencies in the prior art, present invention aims to design projection lens with aspherical lens,
Reach higher clarity possessed by aspherical lens and TV distortion requires；It is designed using low F number, that is, low f-number, is made simultaneously
MTF keeps high value.
The purpose of the present invention adopts the following technical scheme that realization：
A kind of ultrashort full HD projection lens of coke, including the reflecting mirror and lens group being set between dmd chip and perspective plane
Part；
The lens subassembly is set between the reflecting mirror and dmd chip；The lens subassembly is from reflecting mirror to dmd chip
With optical axis be arranged, the lens subassembly successively include the first positive meniscus lens, the first cemented doublet, the first diverging meniscus lens,
Second positive meniscus lens, the first convex lens, the first biconcave lens, the second convex lens, third convex lens, the second cemented doublet,
4th convex lens, the 5th convex lens；
The projected light beam of the dmd 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 and diaphragm, and the prism group is convex set on dmd chip and the 5th
Between lens, the diaphragm is set between the second convex lens and third 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 30mm and 60mm；
The focal length of first positive meniscus lens is between 50mm and 70mm；
The focal length of first cemented doublet is between 170mm and 230mm；
The focal length of first diverging meniscus lens is between -70mm and -50mm；
The focal length of second positive meniscus lens is between 80mm and 120mm；
The focal length of first convex lens is between 40mm and 65mm；
The focal length of first biconcave lens is between -40mm and -20mm；
The focal length of second convex lens is between 35mm and 55mm；
The focal length of the third convex lens is between 25mm and 45mm；
The focal length of second cemented doublet is between -30mm and -20mm；
The focal length of 4th convex lens is between 50mm and 70mm；
The focal length of 5th convex lens is between 20mm and 40mm.
Further, first cemented doublet includes the 6th concavees lens and the 6th convex lens；6th concavees lens
Close to the first positive meniscus lens, the refractive index of the 6th concavees lens is between 1.75 and 1.85；6th convex lens leans on
Nearly first diverging meniscus lens, the refractive index of the 6th convex lens is between 1.60 and 1.70；
The refractive index of first diverging meniscus lens is between 1.50 and 1.60；
The refractive index of first positive meniscus lens is between 1.80 and 1.90；
The refractive index of first convex lens is between 1.50 and 1.60；
The refractive index of first biconcave lens is between 1.65 and 1.75；
The refractive index of second convex lens is between 1.55 and 1.65；
The refractive index of the third convex lens is between 1.45 and 1.55；
Second cemented doublet includes the 7th concavees lens and the 7th convex lens, and the 7th concavees lens are convex close to third
Lens, the refractive index of the 7th concavees lens is between 1.85 and 1.95；7th convex lens is close to the 4th convex lens, institute
The refractive index of the 7th convex lens is stated between 1.55 and 1.65；
The refractive index of 4th convex lens is between 1.45 and 1.55；
The refractive index of 5th convex lens is between 1.55 and 1.65.
Further, the working face of first positive meniscus lens and the first diverging meniscus lens 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.
Further, it is negative curved to be greater than first for the distance between first diverging meniscus lens and second positive meniscus lens
The half of the sum of month lens and the second positive meniscus lens bore, keeps projected light beam just curved in first diverging meniscus lens and second
90 degree are bent between month lens.
Compared with prior art, the beneficial effects of the present invention are：There is provided a F-number is 2.4, is distorted less than 1%, burnt
Away from the projection lens for 3.5mm；Precise structure, control low cost, the image-forming objective lens of smaller size smaller.First diverging meniscus lens simultaneously
And second distance between positive meniscus lens it is longer, projection lens can be made to bend 90 degree here, further reduce volume, matched
Projector architecture, projection lens form the image planes that diagonal line is 60 inches in the position 0.4m.
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the schematic diagram that the present invention projects off axis；
Fig. 3 is MTF curve figure of the invention；
Fig. 4 is point range figure of the invention.
In figure：1, reflecting mirror；2, dmd chip；3, lens subassembly；31, the first positive meniscus lens；32, first pair of gluing is saturating
Mirror；321, the 6th concavees lens；322, the 6th convex lens；33, the first diverging meniscus lens；34, the second positive meniscus lens；35, first
Convex lens；36, the first biconcave lens；37, the second convex lens；38, third convex lens；39, the second cemented doublet；391, the 7th
Concavees lens；392, the 7th convex lens；310, the 4th convex lens；311, the 5th convex lens；4, prism group；5, window glass；6, light
Door screen；7 perspective planes.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
As shown in Figure 1, a kind of ultrashort full HD projection lens of coke, structure are as follows：Including being set to dmd chip 2 and perspective plane 7
Between reflecting mirror 1 and lens subassembly 3；Lens subassembly 3 is set between reflecting mirror 1 and dmd chip 2；Lens subassembly 3 is from reflecting mirror
1 is arranged to dmd chip 2 with optical axis, and lens subassembly 3 successively includes the first positive meniscus lens 31, the first cemented doublet 32, first
Diverging meniscus lens 33, the second positive meniscus lens 34, the first convex lens 35, the first biconcave lens 36, the second convex lens 37, third are convex
Lens 38, the second cemented doublet 39, the 4th convex lens 310, the 5th convex lens 311；Dmd chip 2 modulate projected light beam according to
It is secondary to be imaged through lens subassembly 3 and reflecting mirror 1 and on perspective plane 7.
Projection lens 3 further includes prism group 4 and diaphragm 6, and prism group 3 is set between dmd chip 2 and the 5th convex lens 311,
Diaphragm 6 is set between the second convex lens 37 and third convex lens 38.Reflecting mirror 1 is spherical reflector, and spherical reflector includes one
Concave surface, concave surface the first positive meniscus lens 31 of direction.1 radius of curvature of reflecting mirror is between 30mm and 60mm；First positive bent moon is saturating
The focal length of mirror 31 is between 50mm and 70mm；The focal length of first cemented doublet 32 is between 170mm and 230mm；First
The focal length of diverging meniscus lens 33 is between -70mm and -50mm；The focal length of second positive meniscus lens 34 is between 80mm and 120mm
Between；The focal length of first convex lens 36 is between 40mm and 65mm；The focal length of first biconcave lens 36 between -40mm with -
Between 20mm；The focal length of second convex lens 37 is between 35mm and 55mm；The focal length of third convex lens 38 between 25mm with
Between 45mm；The focal length of second cemented doublet 39 is between -30mm and -20mm；The focal length of 4th convex lens 310 between
Between 50mm and 70mm；The focal length of 5th convex lens 311 is between 20mm and 40mm.
First cemented doublet 32 includes the 6th concavees lens 321 and the 6th convex lens 322；6th concavees lens 321 are close to
One positive meniscus lens 31, the refractive index of the 6th concavees lens 321 is between 1.75 and 1.85；6th convex lens 322 is close to first
Diverging meniscus lens 33, the refractive index of the 6th convex lens 322 is between 1.60 and 1.70；The refractive index of first diverging meniscus lens 33
Between 1.50 and 1.60；The refractive index of first positive meniscus lens 31 is between 1.80 and 1.90；First convex lens 35
Refractive index is between 1.50 and 1.60；The refractive index of first biconcave lens 36 is between 1.65 and 1.75；Second convex lens
37 refractive index is between 1.55 and 1.65；The refractive index of third convex lens 38 is between 1.45 and 1.55；Second pair of glue
Closing lens 39 includes the 7th concavees lens 391 and the 7th convex lens .92, and the 7th concavees lens 391 are recessed close to third convex lens 38, the 7th
The refractive index of lens 391 is between 1.85 and 1.95；7th convex lens 392 is close to the 4th convex lens 310, the 7th convex lens
392 refractive index is between 1.55 and 1.65；The refractive index of 4th convex lens 310 is between 1.45 and 1.55；5th is convex
The refractive index of lens 311 is between 1.55 and 1.65.The working face of first positive meniscus lens 31 and the first diverging meniscus lens 33
It is aspherical.Dmd chip 2 is that 0.47 inch of resolution ratio is 1920 × 1080 or 0.48 inches of resolution ratio 1920 × 1200.DMD
Chip 2 is vertical with the optical axis of lens subassembly 3；The center of projection lens is except the region of dmd chip 2.First diverging meniscus lens
33 and second the distance between positive meniscus lens 34 be greater than the first diverging meniscus lens 33 and the second positive meniscus lens 34 bore it
The half of sum makes projected light beam bend 90 degree between first diverging meniscus lens 33 and the second positive meniscus lens 34.First
Diverging meniscus lens 33 refers to the diameter of the vertical respectively maximum cross-section of primary optical axis with the bore of the second positive meniscus lens 34.
Realization of the invention is with diaphragm 6 for boundary, bears group eyeglass preceding, posterior retrofocus type object lens is just being organized, wherein just
Group is divided into the A group by transmiting twice again and only passes through the B group projected with this.A group, B group and negative component are constructed according to this configuration
Composition initial configuration is not replaced with several eyeglasses, changes chip size, passes through replacement increase and decrease glass material, focal length scaling and aberration
The optimization design of control is finally reached the excellent projection lens design of image quality.The present invention use special lens arrangement, first 4
Lens transmit twice by positive and negative, eyeglass number and volume needed for not only reducing projection lens, and make anti-using spherical surface
Mirror is penetrated to be possibly realized.
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 of the present invention for the dmd chip 2 that 0.47 inch of resolution ratio is 1920 × 1080 below
The parameter of optical system embodiment.
The sort method of above-mentioned surface serial number is:It is the first face from the convex surface of the first positive meniscus lens 31, it is determined as serial number 1,
It is successively backward then each face label by the sequence of lens subassembly 3.
Aspherical surface data：
| Surface serial number | x2 | x4 | x6 | x8 |
| 2 | 0 | -2.86850E-05 | -2.58926E-08 | 3.47061E-11 |
| 3 | 0 | -2.77827E-05 | -8.36389E-10 | 7.92256E-12 |
| 7 | 0 | 1.33191E-05 | -2.40154E-10 | -1.62181E-12 |
| 8 | 0 | 1.70890E-06 | 2.90125E-11 | -1.12815E-13 |
It finally obtains focal length 3.5mm, optical tube length 200mm, F2.4, distorts less than 1%, each visual field image quality is uniformly and picture
The optimal ultra-short focus projection lens of matter.The present invention, which is realized, forms the image planes that diagonal line is 60 inches in the position 0.4m.
If Fig. 2 is the schematic diagram that the present invention projects off axis.
MTF curve if Fig. 3 is each visual field under 93lp/mm in MTF curve figure figure of the invention compact is greater than at a branch of
0.5, illustrate that the lens imaging picture is clearly uniform.The pixel of 1920 × 1,200 0.48 chip is 5.4 microns, corresponding Kui Nisi
Line is to for 93lp/mm, in the line to lower MTF numerical value>0.5 meets the resolution requirement of the chip.0.47 chip is less than 0.48
Chip, pixel are equally 5.4 microns, and corresponding Kui Nisi line is to for 93lp/mm, in the line to lower MTF numerical value>0.5 i.e. satisfaction should
The resolution requirement of chip.
Fig. 4 is point range figure of the invention, is known from figure, and the disc of confusion radius that is averaged of the point range figure under each visual field is micro- less than 5.3
Rice, image quality are fine.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (10)
1. a kind of ultrashort full HD projection lens of coke, which is characterized in that including the reflecting mirror being set between dmd chip and perspective plane
And lens subassembly；
The lens subassembly is set between the reflecting mirror and dmd chip；The lens subassembly is shared the same light from reflecting mirror to dmd chip
Axis setting, the lens subassembly successively includes the first positive meniscus lens, the first cemented doublet, the first diverging meniscus lens, second
Positive meniscus lens, the first convex lens, the first biconcave lens, the second convex lens, third convex lens, the second cemented doublet, the 4th
Convex lens, the 5th convex lens；
The projected light beam of the dmd chip modulation passes sequentially through lens subassembly and reflecting mirror and is imaged on the projection surface.
2. the ultrashort full HD projection lens of coke as described in claim 1, which is characterized in that the projection lens further includes prism
Group and diaphragm, the prism group are set between dmd chip and the 5th convex lens, and the diaphragm is set to the second convex lens and third is convex
Between lens.
3. the ultrashort full HD projection lens of coke as described in claim 1, which is characterized in that the reflecting mirror is spheric reflection
Mirror, the spherical reflector include a concave surface, the first positive meniscus lens of the concave surface direction.
4. the ultrashort full HD projection lens of coke a method according to any one of claims 1-3, which is characterized in that
The mirror curvature radius is between 30mm and 60mm；
The focal length of first positive meniscus lens is between 50mm and 70mm；
The focal length of first cemented doublet is between 170mm and 230mm；
The focal length of first diverging meniscus lens is between -70mm and -50mm；
The focal length of second positive meniscus lens is between 80mm and 120mm；
The focal length of first convex lens is between 40mm and 65mm；
The focal length of first biconcave lens is between -40mm and -20mm；
The focal length of second convex lens is between 35mm and 55mm；
The focal length of the third convex lens is between 25mm and 45mm；
The focal length of second cemented doublet is between -30mm and -20mm；
The focal length of 4th convex lens is between 50mm and 70mm；
The focal length of 5th convex lens is between 20mm and 40mm.
5. the ultrashort full HD projection lens of coke as claimed in claim 4, which is characterized in that first cemented doublet includes
6th concavees lens and the 6th convex lens；6th concavees lens are close to the first positive meniscus lens, the refraction of the 6th concavees lens
Rate is between 1.75 and 1.85；6th convex lens is close to the first diverging meniscus lens, the refractive index of the 6th convex lens
Between 1.60 and 1.70；
The refractive index of first diverging meniscus lens is between 1.50 and 1.60；
The refractive index of first positive meniscus lens is between 1.80 and 1.90；
The refractive index of first convex lens is between 1.50 and 1.60；
The refractive index of first biconcave lens is between 1.65 and 1.75；
The refractive index of second convex lens is between 1.55 and 1.65；
The refractive index of the third convex lens is between 1.45 and 1.55；
Second cemented doublet includes the 7th concavees lens and the 7th convex lens, and the 7th concavees lens are close to third convex lens
Mirror, the refractive index of the 7th concavees lens is between 1.85 and 1.95；7th convex lens is described close to the 4th convex lens
The refractive index of 7th convex lens is between 1.55 and 1.65；
The refractive index of 4th convex lens is between 1.45 and 1.55；
The refractive index of 5th convex lens is between 1.55 and 1.65.
6. the ultrashort full HD projection lens of coke as described in claim 1, which is characterized in that first positive meniscus lens and the
The working face of one diverging meniscus lens is aspherical.
7. the ultrashort full HD projection lens of coke as claimed in claim 5, which is characterized in that first positive meniscus lens and the
The working face of one diverging meniscus lens is aspherical.
8. the ultrashort full HD projection lens of coke as claimed in claim 7, which is characterized in that the dmd chip is 0.47 inch
Resolution ratio is 1920 × 1080 or 0.48 inches of resolution ratio 1920 × 1200.
9. the ultrashort full HD projection lens of coke as claimed in claim 8, which is characterized in that the dmd chip and the lens
The optical axis of component is vertical；The center of the projection lens is except the region of the dmd chip.
10. the ultrashort full HD projection lens of coke as claimed in claim 9, which is characterized in that first diverging meniscus lens with
The distance between described second positive meniscus lens is greater than the half of the sum of the first diverging meniscus lens and second positive meniscus lens bore,
Projected light beam is set to bend 90 degree between first diverging meniscus lens and the second positive meniscus lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810782211.3A CN108873259A (en) | 2018-07-17 | 2018-07-17 | A kind of ultrashort full HD projection lens of coke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810782211.3A CN108873259A (en) | 2018-07-17 | 2018-07-17 | A kind of ultrashort full HD projection lens of coke |
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| Publication Number | Publication Date |
|---|---|
| CN108873259A true CN108873259A (en) | 2018-11-23 |
Family
ID=64302528
Family Applications (1)
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|---|---|---|---|
| CN201810782211.3A Pending CN108873259A (en) | 2018-07-17 | 2018-07-17 | A kind of ultrashort full HD projection lens of coke |
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| CN (1) | CN108873259A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111290105A (en) * | 2020-02-26 | 2020-06-16 | 歌尔股份有限公司 | Optical system and projection apparatus |
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| CN208334759U (en) * | 2018-07-17 | 2019-01-04 | 安徽仁和光电科技有限公司 | A kind of ultrashort full HD projection lens of coke |
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|---|---|---|---|---|
| JP2000298234A (en) * | 1999-04-13 | 2000-10-24 | Matsushita Electric Ind Co Ltd | Projection lens, video magnification projection system using the lens, video projector, rear projector, and multivision system using same |
| JP2004070306A (en) * | 2002-06-12 | 2004-03-04 | Fuji Photo Optical Co Ltd | Zoom lens and projection type display device using lens |
| CN103777314A (en) * | 2012-10-25 | 2014-05-07 | 扬明光学股份有限公司 | Wide-angle projection lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111290105A (en) * | 2020-02-26 | 2020-06-16 | 歌尔股份有限公司 | Optical system and projection apparatus |
| CN111290105B (en) * | 2020-02-26 | 2022-05-24 | 歌尔股份有限公司 | Optical system and projection apparatus |
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