CN108957704B - High-definition short-focus projection lens - Google Patents
High-definition short-focus projection lens Download PDFInfo
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- CN108957704B CN108957704B CN201811002335.1A CN201811002335A CN108957704B CN 108957704 B CN108957704 B CN 108957704B CN 201811002335 A CN201811002335 A CN 201811002335A CN 108957704 B CN108957704 B CN 108957704B
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- 230000005499 meniscus Effects 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 230000004075 alteration Effects 0.000 abstract description 4
- 238000012634 optical imaging Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 239000005357 flat glass Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- 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
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
-
- 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
- G03B21/142—Adjusting of projection optics
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Projection Apparatus (AREA)
Abstract
The invention discloses a high-definition short-focus projection lens, which comprises a reflecting mirror and a lens component, wherein the reflecting mirror and the lens component are arranged between a DMD chip and a projection surface; the lens component is arranged on the same optical axis as the DMD chip from the reflector and comprises a first positive meniscus lens, a second positive meniscus lens, a first concave lens, a first convex lens, a fifth convex lens, a first double-cemented lens, a second double-cemented lens and a fourth convex lens in sequence; the projection beam modulated by the DMD chip sequentially passes through the lens component and the reflecting mirror and forms an image on a projection surface. Based on the optical imaging principle, the projection objective is repeatedly subjected to structural optimization design by using optical design software to achieve aberration, so that the projection objective has the advantages of good image quality, novel structure, ingenious design, strong applicability and convenient popularization.
Description
Technical Field
The invention relates to the field of projection, in particular to a high-definition short-focus projection lens.
Background
At present, an ultra-short focal projection lens is generally designed to directly project a projection picture onto a screen by using an aspheric mirror, but the processing of the aspheric mirror with a large caliber is difficult, and industrialization is difficult. The use of spherical mirrors directly projected onto the screen is undesirable.
Meanwhile, the F number, namely the F number of the projection lens of the existing projector is higher, and if the F number is reduced, the definition of the picture is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a high-definition short-focus projection lens which can solve the problem of unsatisfactory projection effect.
One of the purposes of the invention is realized by adopting the following technical scheme:
the high-definition short-focus projection lens comprises a reflector and a lens assembly, wherein the reflector and the lens assembly are arranged between a DMD chip and a projection surface, and the lens assembly is arranged between the reflector and the DMD chip; the lens component is arranged on the same optical axis of the reflector and the DMD chip, and sequentially comprises a first positive meniscus lens, a second positive meniscus lens, a first concave lens, a first convex lens, a fifth convex lens, a first double-cemented lens, a second double-cemented lens and a fourth convex lens; the projection light beam modulated by the DMD chip sequentially passes through the lens component and the reflecting mirror and forms an image on the projection surface.
Further, the high-definition short-focus projection lens further comprises a prism group and a diaphragm, wherein the prism group is arranged between the DMD chip and the fourth convex lens, and the diaphragm is arranged between the first double-cemented lens and the second double-cemented lens.
Further, the reflecting mirror is a spherical reflecting mirror, and the spherical reflecting mirror comprises a concave surface facing the first positive meniscus lens.
Further, the mirror radius of curvature is between 15mm and 40 mm; the focal length of the first positive meniscus lens is between 50mm and 70 mm; the focal length of the second positive meniscus lens is between 100mm and positive infinity; the focal length of the first concave lens is between-30 mm and-10 mm; the focal length of the first convex lens is between 30mm and 60 mm; the focal length of the fifth convex lens is between 35mm and 65 mm; the focal length of the first double-cemented lens is between 60mm and 80 mm; the focal length of the second double-cemented lens is between 30mm and 60 mm; the focal length of the fourth convex lens is between 10mm and 40 mm.
Further, the first double-cemented lens comprises a second concave lens and a second convex lens, the second concave lens is close to the fifth convex lens, the second convex lens is close to the second double-cemented lens, the refractive index of the second concave lens is between 1.65 and 1.75, and the refractive index of the second convex lens is between 1.50 and 1.60.
Further, the second double-cemented lens comprises a third convex lens and a third concave lens, wherein the third convex lens is close to the diaphragm, the refractive index of the third convex lens is between 1.55 and 1.70, the third concave lens is close to the fourth convex lens, and the refractive index of the third concave lens is between 1.70 and 1.80.
Further, the refractive index of the first positive meniscus lens is between 1.45 and 1.60; the refractive index of the second positive meniscus lens is between 1.65 and 1.80; the refractive index of the first concave lens is between 1.45 and 1.60; the refractive index of the first convex lens is between 1.75 and 1.90; the refractive index of the fifth convex lens is between 1.65 and 1.75; the refractive index of the fourth convex lens is between 1.70 and 1.80.
Further, the left and right sides of the first positive meniscus lens and the first concave lens are aspheric surfaces.
Further, the DMD chip is either 1280 x 720 or 0.33 inch 1368 x 768 with a resolution of 0.3 inch.
Further, the DMD chip is perpendicular to the optical axis of the lens assembly, and the center of the projection lens is outside the area of the DMD chip.
Compared with the prior art, the invention has the beneficial effects that:
the lens component is arranged between the reflecting mirror and the DMD chip; the lens component is arranged on the same optical axis of the reflector and the DMD chip, the prism group is arranged between the DMD chip and the fourth convex lens, and the diaphragm is arranged between the first double-cemented lens and the second double-cemented lens. The DMD chip is perpendicular to the optical axis of the lens assembly, and the center of the projection lens is outside the area of the DMD chip. Projection light beam modulated by the DMD chip sequentially passes through the lens component and the reflecting mirror and forms images on the projection surface, in the application, the F number of the high-definition short-focus projection lens 100 is 2.4, the distortion is less than 1%, the focal length is 3mm, the structure is precise, the control cost is low, and the high-definition short-focus projection lens is an imaging objective lens with smaller volume. The lens system described above forms an image plane with a diagonal of 55 inches at the 0.5m position. The projection objective lens structure is repeatedly designed to achieve the optimal design of the aberration by using optical design software based on the optical imaging principle, and the projection objective lens structure is good in image quality, novel in structure, ingenious in design, high in applicability and convenient to popularize.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a high-definition short-focus projection lens according to a preferred embodiment of the present invention;
FIG. 2 is a schematic illustration of an off-axis projection of the present invention;
FIG. 3 is a graph of MTF for the present invention;
fig. 4 is a dot column diagram of the present invention.
In the figure: 100. high-definition short-focus projection lens; 1. a reflecting mirror; 2. a DMD chip; 3. a lens assembly; 31. a first positive meniscus lens; 32. a second positive meniscus lens; 33. a first concave lens; 34. a first convex lens; 35. a fifth convex lens; 36. a first doublet lens; 361. a second concave lens; 362. a second convex lens; 37. a second double cemented lens; 371. a third convex lens; 372. a third concave lens; 38. a fourth convex lens; 4. a prism group; 5. a window glass; 6. a diaphragm; 7. a projection surface.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a high-definition short-focus projection lens 100 includes a mirror 1 disposed between a DMD chip 2 and a projection surface 7, a lens assembly 3, a prism set 4, a window glass 5, a diaphragm 6, and the projection surface 7.
The reflecting mirror 1 is a spherical reflecting mirror, and the spherical reflecting mirror includes a concave surface, and the concave surface faces the first positive meniscus lens 31.
The DMD chip 2 is either 0.3 inch resolution 1280 x 720 or 0.33 inch 1368 x 768.
The lens assembly 3 includes, in order, a first positive meniscus lens 31, a second positive meniscus lens 32, a first concave lens 33, a first convex lens 34, a fifth convex lens 35, a first doublet 36, a second doublet 37, and a fourth convex lens 38.
Specifically, in the present embodiment, the radius of curvature of the reflecting mirror 1 is between 15mm and 40 mm; the focal length of the first positive meniscus lens 31 is between 50mm and 70 mm; the focal length of the second positive meniscus lens 32 is between 100mm and positive infinity; the focal length of the first concave lens 33 is between-30 mm and-10 mm; the focal length of the first convex lens 34 is between 30mm and 60 mm; the focal length of the fifth convex lens 35 is between 35mm and 65 mm; the focal length of the first doublet lens 36 is between 60mm and 80 mm; the focal length of the second double cemented lens 37 is between 30mm and 60 mm; the fourth convex lens 38 has a focal length between 10mm and 40 mm.
The first double-cemented lens 36 includes a second concave lens 361 and a second convex lens 362, the second concave lens 361 is close to the fifth convex lens 35, the second convex lens 362 is close to the second double-cemented lens 37, the second double-cemented lens 37 includes a third convex lens 371 and a third concave lens 372, and the third convex lens 371 is close to the diaphragm.
Specifically, the refractive index of the first positive meniscus lens 31 is between 1.45 and 1.60; the refractive index of the second positive meniscus lens 32 is between 1.65 and 1.80; the refractive index of the first concave lens 33 is between 1.45 and 1.60; the refractive index of the first convex lens 34 is between 1.75 and 1.90; the refractive index of the fifth convex lens 35 is between 1.65 and 1.75; the refractive index of the fourth convex lens 38 is between 1.70 and 1.80. The refractive index of the second concave lens 361 is between 1.65 and 1.75, the refractive index of the second convex lens 362 is between 1.50 and 1.60, the refractive index of the third convex lens 371 is between 1.55 and 1.70, the third concave lens 372 is close to the fourth convex lens 38, and the refractive index of the third concave lens 372 is between 1.70 and 1.80.
The left and right surfaces of the first positive meniscus lens 31 and the first concave lens 33 are aspherical surfaces, and the curvature radius, material, thickness and spacing between the lenses are modified to optimize aberrations. The following is an example of a 0.33 inch DMD chip, which gives parameters for one embodiment of the projection lens optical system of the present invention:
aspheric coefficients:
| Surface | x2 | x4 | x6 | x8 |
| 2 | 0 | -9.19482E-05 | -1.26000E-07 | 3.84994E-10 |
| 3 | 0 | -1.28904E-04 | 7.95304E-07 | -3.01751E-09 |
| 6 | 0 | -6.69186E-05 | 6.36768E-07 | -7.64324E-10 |
| 7 | 0 | -3.10317E-05 | 3.11609E-07 | -1.97846E-10 |
finally, the ultra-short focal projection lens with the focal length of 3mm, the optical barrel length of 100mm, F2.4 and distortion of less than 1 percent and uniform and optimal image quality of each view field is obtained. The invention realizes the formation of an image plane with a diagonal line of 55 inches at a position of 0.5 m.
Please refer to fig. 2, which is a schematic diagram of the off-axis projection of the present invention, and fig. 3, which is a chart of the MTF of the present invention, wherein the MTF of each field of view at 93lp/mm is compact to form a beam of more than 0.65, which illustrates that the imaging frame of the high-definition short-focus projection lens 100 is clear and uniform. The pixel of the 1368×768 0.33 chip is 5.4 μm, and the corresponding quinius line pair is 93lp/mm, and the MTF value >0.65 in the line pair meets the resolution requirement of the chip. The 0.3 chip is smaller than the 0.33 chip, the pixel is 5.4 microns, the corresponding quinius line pair is 93lp/mm, and the MTF value under the line pair is more than 0.65, so that the resolution requirement of the chip is met.
Referring to fig. 4, the average speckle radius of the point column diagram at each view field is smaller than 4.2 μm, and the image quality is good.
When the high-definition short-focus projection lens 100 is assembled, the lens component 3 is arranged between the reflector 1 and the DMD chip 2; the lens assembly 3 is arranged on the same optical axis from the reflector 1 and the DMD chip 2, the prism group 4 is arranged between the DMD chip 2 and the fourth convex lens 38, and the diaphragm 6 is arranged between the first double-cemented lens 36 and the second double-cemented lens 37. The DMD chip 2 is perpendicular to the optical axis of the lens assembly 3, and the center of the projection lens is outside the area of the DMD chip 2. The projection light beam modulated by the DMD chip 2 sequentially passes through the lens component 3 and the reflecting mirror 1 and forms an image on the projection surface 7, in the application, the f-number of the high-definition short-focus projection lens 100 is 2.4, the distortion is less than 1%, the focal length is 3mm, the structure is precise, the control cost is low, and the high-definition short-focus projection lens is an imaging objective lens with a smaller volume. The lens system described above forms an image plane with a diagonal of 55 inches at the 0.5m position. The projection objective lens structure is repeatedly designed to achieve the optimal design of the aberration by using optical design software based on the optical imaging principle, and the projection objective lens structure is good in image quality, novel in structure, ingenious in design, high in applicability and convenient to popularize.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (7)
1. The utility model provides a high definition short burnt projection lens, includes reflector and the lens subassembly of locating between DMD chip and the projection face, its characterized in that: the lens component is arranged between the reflecting mirror and the DMD chip; the lens component is arranged on the same optical axis of the reflector and the DMD chip, and sequentially comprises a first positive meniscus lens, a second positive meniscus lens, a first concave lens, a first convex lens, a fifth convex lens, a first double-cemented lens, a second double-cemented lens and a fourth convex lens; the projection light beam modulated by the DMD chip sequentially passes through the lens component and the reflecting mirror and forms an image on the projection surface;
the radius of curvature of the reflector is between 15mm and 40 mm;
the focal length of the first positive meniscus lens is between 50mm and 70 mm;
the focal length of the second positive meniscus lens is between 100mm and positive infinity;
the focal length of the first concave lens is between-30 mm and-10 mm;
the focal length of the first convex lens is between 30mm and 60 mm;
the focal length of the fifth convex lens is between 35mm and 65 mm;
the focal length of the first double-cemented lens is between 60mm and 80 mm;
the focal length of the second double-cemented lens is between 30mm and 60 mm;
the focal length of the fourth convex lens is between 10mm and 40 mm;
the first double-cemented lens comprises a second concave lens and a second convex lens, the second concave lens is close to the fifth convex lens, the second convex lens is close to the second double-cemented lens, the refractive index of the second concave lens is between 1.65 and 1.75, and the refractive index of the second convex lens is between 1.50 and 1.60;
the second double-cemented lens comprises a third convex lens and a third concave lens, wherein the third convex lens is close to the diaphragm, the refractive index of the third convex lens is between 1.55 and 1.70, the third concave lens is close to the fourth convex lens, and the refractive index of the third concave lens is between 1.70 and 1.80.
2. The high definition short focus projection lens of claim 1, wherein: the high-definition short-focus projection lens further comprises a prism group and a diaphragm, wherein the prism group is arranged between the DMD chip and the fourth convex lens, and the diaphragm is arranged between the first double-cemented lens and the second double-cemented lens.
3. The high definition short focus projection lens of claim 1, wherein: the reflecting mirror is a spherical reflecting mirror, and the spherical reflecting mirror comprises a concave surface which faces the first positive meniscus lens.
4. The high definition short focus projection lens of claim 1, wherein: the refractive index of the first positive meniscus lens is between 1.45 and 1.60;
the refractive index of the second positive meniscus lens is between 1.65 and 1.80;
the refractive index of the first concave lens is between 1.45 and 1.60;
the refractive index of the first convex lens is between 1.75 and 1.90;
the refractive index of the fifth convex lens is between 1.65 and 1.75;
the refractive index of the fourth convex lens is between 1.70 and 1.80.
5. The high definition short focus projection lens of claim 1, wherein: the left and right sides of the first positive meniscus lens and the first concave lens are aspheric surfaces.
6. The high definition short focus projection lens of claim 1, wherein: the DMD chip is one of 0.3 inch resolution 1280 x 720 and 0.33 inch resolution 1368 x 768.
7. The high definition short focus projection lens of claim 1, wherein: the DMD chip is perpendicular to the optical axis of the lens assembly, and the center of the projection lens is outside the area of the DMD chip.
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| CN201811002335.1A CN108957704B (en) | 2018-08-30 | 2018-08-30 | High-definition short-focus projection lens |
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| CN201811002335.1A CN108957704B (en) | 2018-08-30 | 2018-08-30 | High-definition short-focus projection lens |
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| CN108957704A CN108957704A (en) | 2018-12-07 |
| CN108957704B true CN108957704B (en) | 2024-02-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN111897182B (en) * | 2020-09-10 | 2022-02-11 | 深圳市点睛创视技术有限公司 | Ultrashort-focus objective lens system for miniature projection |
| CN117348323A (en) * | 2023-12-04 | 2024-01-05 | 深圳昇旸光学科技有限公司 | Projection lens and projection display device |
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| JPH04163414A (en) * | 1990-10-26 | 1992-06-09 | Canon Inc | Wide angle zoom lens |
| JP2000098222A (en) * | 1998-09-18 | 2000-04-07 | Cosina Co Ltd | Projection lens |
| CN107422458A (en) * | 2017-09-08 | 2017-12-01 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of L-type short focus of low F numbers |
| CN207198441U (en) * | 2017-09-06 | 2018-04-06 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of low F numbers |
| CN207216118U (en) * | 2017-09-08 | 2018-04-10 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of L-type short focus of low F numbers |
| CN208861053U (en) * | 2018-08-30 | 2019-05-14 | 安徽仁和光电科技有限公司 | High definition short focus projection lens |
-
2018
- 2018-08-30 CN CN201811002335.1A patent/CN108957704B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04163414A (en) * | 1990-10-26 | 1992-06-09 | Canon Inc | Wide angle zoom lens |
| JP2000098222A (en) * | 1998-09-18 | 2000-04-07 | Cosina Co Ltd | Projection lens |
| CN207198441U (en) * | 2017-09-06 | 2018-04-06 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of low F numbers |
| CN107422458A (en) * | 2017-09-08 | 2017-12-01 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of L-type short focus of low F numbers |
| CN207216118U (en) * | 2017-09-08 | 2018-04-10 | 杭州有人光电技术有限公司 | A kind of full HD projection lens of L-type short focus of low F numbers |
| CN208861053U (en) * | 2018-08-30 | 2019-05-14 | 安徽仁和光电科技有限公司 | High definition short focus projection lens |
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