CN106597644B - High definition projection lens - Google Patents
High definition projection lens Download PDFInfo
- Publication number
- CN106597644B CN106597644B CN201611260825.2A CN201611260825A CN106597644B CN 106597644 B CN106597644 B CN 106597644B CN 201611260825 A CN201611260825 A CN 201611260825A CN 106597644 B CN106597644 B CN 106597644B
- Authority
- CN
- China
- Prior art keywords
- lens
- refractive index
- convex lens
- focal length
- convex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
-
- 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
Abstract
The invention discloses a high-definition projection lens which comprises a plurality of coaxially arranged lenses between a projection surface and a DMD chip, wherein the lenses are a positive meniscus lens, a first negative meniscus lens, a second negative meniscus lens, a third negative meniscus lens, a biconcave lens, a first doublet, a first convex lens, a second doublet, a third convex lens, a third doublet and a fourth convex lens in sequence from the projection surface to the DMD chip. The lenses in the high-definition projection lens all adopt spherical lenses, and the spherical lenses meet the requirements of definition and TV distortion, reduce the production cost, solve the problem of yellowing of materials and meet the requirements of the projection lens with excellent image quality.
Description
Technical Field
The invention relates to a high-definition projection lens, and belongs to the technical field of photoelectric projection.
Background
As a device capable of projecting images or videos onto a curtain, a projector is widely applied to places such as homes, offices, schools and the like, and different types such as CRT, LCD, DLP and the like exist according to different working modes, wherein DLP is an abbreviation of english Digital Light Processor and is translated into a Digital Light Processor, DLP uses a DMD (Digital Micromirror device) Digital micro reflector as a Light valve imaging device, a DLP computer board consists of an analog-Digital decoder, a memory chip, an image Processor and a plurality of Digital Signal Processors (DSPs), and all text images are Digital signals generated by the DLP computer board, and the Digital signals are transferred to a heart-DMD (Digital Micromirror device) of a system after being processed. And the light beam passes through a three-color lens rotating at a high speed, is projected on a DMD and then is projected on a large screen through an optical lens to complete image projection. But at present, projectors with higher pixels generally use aspheric projection lenses, and although the requirements on definition and TV distortion are easily met, the aspheric lenses have high mold opening cost and are easy to yellow, so that the service life is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-definition projection lens, wherein all lenses in the high-definition projection lens adopt spherical lenses, the spherical lenses meet the requirements of definition and TV distortion, meanwhile, the production cost is reduced, the problem of yellowing of materials is solved, and the requirement of the projection lens with excellent image quality is met.
The purpose of the invention can be achieved by adopting the following technical scheme:
the utility model provides a high definition projection lens, high definition projection lens include the coaxial lens of arranging of a plurality of between projection face and the DMD chip, the order of arranging of lens by projection face to the DMD chip is positive meniscus lens, first negative meniscus lens, second negative meniscus lens, third negative meniscus lens, biconcave lens, first pair of cemented lens, first convex lens, second pair of cemented lens, third convex lens, third pair of cemented lens, fourth convex lens in proper order.
Preferably, the high-definition projection lens has a focal length f, and f is 9-9.5 mm.
Preferably, the focal length of the positive meniscus lens is f1, and f1 is 160-180 mm;
the focal length of the first negative meniscus lens is f2, and f2 is-135 to-115 mm;
the focal length of the second negative meniscus lens is f3, and f3 is-85 to-75 mm;
the focal length of the third negative meniscus lens is f4, and f4 is-55 to-45 mm;
the focal length of the biconcave lens is f5, and f5 is-35 to-25 mm;
the focal length of the first cemented doublet is f6, and f6 is 235-265 mm;
the focal length of the first convex lens is f7, and f7 is 45-55 mm;
the focal length of the second convex lens is f8, and f8 is 50-60 mm;
the focal length of the second double cemented lens is f9, and f9 is-30 to-40 mm;
the focal length of the third convex lens is f10, and f10 is 20-30 mm;
the focal length of the third double cemented lens is f11, and f11 is-65 to-55 mm;
the focal length of the fourth convex lens is f12, and f12 is 25-35 mm.
Preferably, the positive meniscus lens has a refractive index of n1, and n1 is 1.55 to 1.65;
the refractive index of the first negative meniscus lens is n2, and n2 is 1.75-1.85;
the refractive index of the second negative meniscus lens is n3, and n3 is 1.75-1.85;
the refractive index of the third negative meniscus lens is n4, and n4 is 1.75-1.85;
the refractive index of the biconcave lens is n5, and n5 is 1.75-1.85;
in the first cemented doublet, the refractive index of one surface close to the biconcave lens is n61, n6 is 11.75-1.85, the refractive index of one surface close to the first convex lens is n62, and n62 is 1.45-1.55;
the refractive index of the first convex lens is n7, and n7 is 1.75-1.85;
the refractive index of the second convex lens is n8, and n8 is 1.45-1.55;
in the second double cemented lens, the refractive index of the surface close to the second convex lens is n91, n91 is 1.45-1.55, the refractive index position of the surface close to the third convex lens is n92, and n92 is 1.75-1.85;
the refractive index of the third convex lens is n10, and n10 is 1.45-1.55;
in the third double cemented lens, the refractive index of the surface close to the third convex lens is n111, n111 is 1.75-1.85, the refractive index of the surface close to the fourth convex lens is n112, and n112 is 1.45-1.55;
the refractive index of the fourth convex lens is n12, and n12 is 1.75-1.85.
Preferably, the high-definition projection lens further comprises a prism combination, and the prism combination is located between the third convex lens and the DMD chip.
Preferably, the DMD chip is selected from one of a 0.65 inch resolution of 1920 × 1080 and a 0.67 inch resolution of 1920 × 1200.
Preferably, the DMD chip is perpendicular to the optic axis, and the center of the DMD chip passes through the optic axis.
Preferably, the high-definition projection lens further comprises a diaphragm, and the diaphragm is located between the second convex lens and the second double cemented lens.
Preferably, the positive meniscus lens, the first negative meniscus lens, the second negative meniscus lens, the third negative meniscus lens, the biconcave lens, the first doublet, the first convex lens, the second doublet, the third convex lens, the third doublet, and the fourth convex lens are all made of glass.
Compared with the prior art, the invention has the beneficial effects that:
1. the lenses in the high-definition projection lens all adopt spherical lenses, and the spherical lenses meet the requirements of definition and TV distortion, reduce the production cost, solve the problem of yellowing of materials and meet the requirements of the projection lens with excellent image quality;
2. the high-definition lens has distortion less than 0.35 percent and focal length f, f of 9-9.5mm, has a simple structure, is made of all-optical glass, is an imaging objective lens subjected to cost control and optimization, and forms an image surface with a diagonal line of 1.78m at a position of 1mm through the lens;
3. the invention is based on the optical imaging principle, uses the diaphragm as the boundary, the negative group lens is in front, the positive group lens is in back, selects the lens with similar structure as the initial structure according to the structure, changes the size of the chip, and finally achieves the projection lens design with excellent image quality by changing the optimization design of increasing and decreasing glass material, zooming focal length and aberration control.
Drawings
Fig. 1 is a schematic structural diagram of a high-definition lens according to the present invention.
Fig. 2 is a MTF graph of the high-definition lens of the present invention.
Fig. 3 is a dot-column diagram of the high-definition lens according to the present invention.
FIG. 4 is a graph of curvature of field and distortion of the HD lens of the invention.
Wherein, 1, a positive meniscus lens; 2. a first negative meniscus lens; 3. a second negative meniscus lens; 4. a third negative meniscus lens; 5. a biconcave lens; 6. a first cemented doublet lens; 7. a first convex lens; 8. a second convex lens; 9. a second cemented doublet lens; 10. a third convex lens; 11. a third cemented doublet; 12. a fourth convex lens; 13. combining prisms; 14. a DMD chip; 15. and (4) a diaphragm.
Detailed Description
The invention will be further described with reference to the accompanying drawings and the detailed description below:
example 1:
referring to fig. 1, a high definition projection lens includes a plurality of coaxially arranged lenses between a projection surface and a DMD chip 14, and the lenses are a positive meniscus lens 1, a first negative meniscus lens 2, a second negative meniscus lens 3, a third negative meniscus lens 4, a biconcave lens 5, a first doublet cemented lens 6, a first convex lens 7, a second convex lens 8, a second doublet cemented lens 9, a third convex lens 10, a third doublet cemented lens 11, and a fourth convex lens 12 in sequence from the projection surface to the DMD chip 14; the focal length of the high-definition projection lens is f, and f is 9-9.5 mm.
The focal length of the positive meniscus lens 1 is f1, and f1 is 160-180 mm; the focal length of the first negative meniscus lens 2 is f2, f2 is-135 to-115 mm; the focal length of the second negative meniscus lens 3 is f3, and f3 is-85 to-75 mm; the focal length of the third negative meniscus lens 4 is f4, f4 is-55 to-45 mm; the focal length of the biconcave lens 5 is f5, and f5 is-35 to-25 mm; the focal length of the first cemented doublet 6 is f6, and f6 is 235-265 mm; the focal length of the first convex lens 7 is f7, and f7 is 45-55 mm; the focal length of the second convex lens 8 is f8, and f8 is 50-60 mm; the focal length of the second doublet 9 is f9, f9 is-30 to-40 mm; the focal length of the third convex lens 10 is f10, and f10 is 20-30 mm; the focal length of the third cemented lens 11 is f11, f11 is-65 to-55 mm; the focal length of the fourth convex lens 12 is f12, and f12 is 25-35 mm.
The positive meniscus lens 1 has a refractive index n1, where n1 is 1.55 to 1.65; the refractive index of the first negative meniscus lens 2 is n2, and n2 is 1.75-1.85; the refractive index of the second negative meniscus lens 3 is n3, and n3 is 1.75-1.85; the refractive index of the third negative meniscus lens 4 is n4, and n4 is 1.75-1.85; the refractive index of the biconcave lens 5 is n5, and n5 is 1.75-1.85; in the first cemented doublet 6, the refractive index of the surface close to the biconcave lens 5 is n61, n6 is 11.75-1.85, the refractive index of the surface close to the first convex lens 7 is n62, and n62 is 1.45-1.55; the refractive index of the first convex lens 7 is n7, and n7 is 1.75-1.85; the refractive index of the second convex lens 8 is n8, and n8 is 1.45-1.55; in the second doublet 9, the refractive index of the surface close to the second convex lens 8 is n91, n91 is 1.45-1.55, and the refractive index of the surface close to the third convex lens 10 is n92, n92 is 1.75-1.85; the refractive index of the third convex lens 10 is n10, and n10 is 1.45-1.55; in the third doublet lens 11, the refractive index of the surface close to the third convex lens 10 is n111, where n111 is 1.75 to 1.85, the refractive index of the surface close to the fourth convex lens 12 is n112, and n112 is 1.45 to 1.55; the refractive index of the fourth convex lens 12 is n12, and n12 is 1.75-1.85.
The high-definition projection lens further comprises a prism combination 13 and a diaphragm 15, wherein the prism combination 13 is located between the third convex lens 10 and the DMD chip 14, and the diaphragm 15 is located between the second convex lens 8 and the second doublet-cemented lens 9.
The positive meniscus lens 1, the first negative meniscus lens 2, the second negative meniscus lens 3, the third negative meniscus lens 4, the biconcave lens 5, the first doublet 6, the first convex lens 7, the second convex lens 8, the second doublet 9, the third convex lens 10, the third doublet 11 and the fourth convex lens 12 are all made of glass materials.
The DMD chip 14 is perpendicular to the optic axis, and the center of the DMD chip 14 passes through the optic axis. The DMD chip 14 is selected from one of 065 inches, 1920 × 1080 and 067 inches in resolution, 1920 × 1200 inches in resolution.
The invention is based on the optical imaging principle, uses optical design software, according to the combined lens focal power formula: phi is phi 1+ phi 2-d phi 1 phi 2, wherein phi is the reciprocal of the focal length and d is the spacing between the lenses, and the radius of curvature, material, thickness and spacing between the lenses of each lens are modified to optimize the aberrations.
Taking the 0.67 inch DMD chip 14 as an example, the parameters of the embodiment of the optical system of the projection lens according to the invention are given, and the surface numbers are sequentially increased from left to right from the convex surface of the first negative meniscus lens 2 to the 1 st surface.
Finally, the optical projection lens with 84 degrees of visual field, 9.4mm of focal length, 215mm of optical cylinder length, F2.4 and less than 0.35% of distortion, uniform image quality of each visual field and optimal image quality is obtained. The invention realizes that 1.1mm forms an image surface with a diagonal of 1.78 m.
Fig. 2 is a MTF graph of the present invention. The MTF curves of all fields under 67lp/mm are compacted into a beam larger than 0.65 in the graph, and the image formed by the lens is clear and uniform. The pixels of a 1920 x 1200 0.67 chip are 7.56 microns, corresponding to a quinies line pair of 67lp/mm, with an MTF value >0.7 for that pair, which meets the resolution requirements of the chip. The 0.65 chip is smaller than the 0.67 chip, the pixel is also 7.56 microns, the corresponding quinis line pair is 67lp/mm, and the resolution requirement of the chip can be met when the MTF value under the line pair is greater than 0.7.
FIG. 3 is a point diagram of the present invention, which shows that the average diffuse spot radius of the point diagram under each field of view is less than 5 microns, and the image quality is good.
Fig. 4 is a graph of field curvature and distortion of the present invention, showing that the field curvature of the lens is less than 0.05mm and the distortion is less than 0.35%.
Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (8)
1. A high-definition projection lens is characterized by comprising a plurality of coaxially arranged lenses between a projection surface and a DMD chip, wherein the lenses are a positive meniscus lens, a first negative meniscus lens, a second negative meniscus lens, a third negative meniscus lens, a biconcave lens, a first biconvex lens, a first convex lens, a second biconvex lens, a third convex lens, a third biconvex lens and a fourth convex lens in sequence from the projection surface to the DMD chip, the total number of the lenses is fifteen, and the first convex lens, the second convex lens, the third convex lens and the fourth convex lens are biconvex lenses;
the focal length of the positive meniscus lens is f1, and f1 is 160-180 mm;
the focal length of the first negative meniscus lens is f2, and f2 is-135 to-115 mm;
the focal length of the second negative meniscus lens is f3, and f3 is-85 to-75 mm;
the focal length of the third negative meniscus lens is f4, and f4 is-55 to-45 mm;
the focal length of the biconcave lens is f5, and f5 is-35 to-25 mm;
the focal length of the first cemented doublet is f6, and f6 is 235-265 mm;
the focal length of the second double cemented lens is f9, and f9 is-30 to-40 mm;
the focal length of the third double cemented lens is f11, and f11 is-65 to-55 mm;
the focal length of the first convex lens is f7, and f7 is 45-55 mm;
the focal length of the second convex lens is f8, and f8 is 50-60 mm;
the focal length of the third convex lens is f10, and f10 is 20-30 mm;
the focal length of the fourth convex lens is f12, and f12 is 25-35 mm.
2. The high-definition projection lens as claimed in claim 1, wherein the focal length of the high-definition projection lens is f, and f is 9-9.5 mm.
3. The high definition projection lens of claim 1,
the refractive index of the positive meniscus lens is n1, and n1 is 1.55-1.65;
the refractive index of the first negative meniscus lens is n2, and n2 is 1.75-1.85;
the refractive index of the second negative meniscus lens is n3, and n3 is 1.75-1.85;
the refractive index of the third negative meniscus lens is n4, and n4 is 1.75-1.85;
the refractive index of the biconcave lens is n5, and n5 is 1.75-1.85;
in the first cemented doublet, the refractive index of one surface close to the biconcave lens is n61, n6 is 11.75-1.85, the refractive index of one surface close to the first convex lens is n62, and n62 is 1.45-1.55;
the refractive index of the first convex lens is n7, and n7 is 1.75-1.85;
the refractive index of the second convex lens is n8, and n8 is 1.45-1.55;
in the second double cemented lens, the refractive index of the surface close to the second convex lens is n91, n91 is 1.45-1.55, the refractive index of the surface close to the third convex lens is n92, and n92 is 1.75-1.85;
the refractive index of the third convex lens is n10, and n10 is 1.45-1.55;
in the third double cemented lens, the refractive index of the surface close to the third convex lens is n111, n111 is 1.75-1.85, the refractive index of the surface close to the fourth convex lens is n112, and n112 is 1.45-1.55;
the refractive index of the fourth convex lens is n12, and n12 is 1.75-1.85.
4. The high definition projection lens of claim 1 further comprising a prism assembly located between the third convex lens and the DMD chip.
5. The high definition projection lens of claim 1, wherein the DMD chip is selected from one of 1920 x 1080 resolution 0.65 inch and 1920 x 1200 resolution 0.67 inch.
6. The high definition projection lens of claim 1, wherein the DMD chip is perpendicular to the optic axis and the center of the DMD chip passes through the optic axis.
7. The high definition projection lens of claim 1 further comprising a diaphragm, wherein the diaphragm is located between the second convex lens and the second doublet.
8. The high definition projection lens of claim 1, wherein the positive meniscus lens, the first negative meniscus lens, the second negative meniscus lens, the third negative meniscus lens, the biconcave lens, the first doublet, the first convex lens, the second doublet, the third convex lens, the third doublet, and the fourth convex lens are made of glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611260825.2A CN106597644B (en) | 2016-12-30 | 2016-12-30 | High definition projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611260825.2A CN106597644B (en) | 2016-12-30 | 2016-12-30 | High definition projection lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106597644A CN106597644A (en) | 2017-04-26 |
| CN106597644B true CN106597644B (en) | 2022-05-17 |
Family
ID=58581821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611260825.2A Active CN106597644B (en) | 2016-12-30 | 2016-12-30 | High definition projection lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106597644B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115145008B (en) * | 2022-07-11 | 2023-06-13 | 南京信息职业技术学院 | Long-focus lens structure for high-brightness large projector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011186269A (en) * | 2010-03-10 | 2011-09-22 | Fujifilm Corp | Wide-angle lens for projection, and projection type display device |
| CN103454757A (en) * | 2012-06-05 | 2013-12-18 | 台达电子工业股份有限公司 | Projection zoom lens |
| CN203930190U (en) * | 2011-10-20 | 2014-11-05 | 富士胶片株式会社 | Zoom lens and projection-type display apparatus for projection |
| CN205485022U (en) * | 2016-03-28 | 2016-08-17 | 中山联合光电科技股份有限公司 | Optical system of high magnification |
| JP2016218170A (en) * | 2015-05-18 | 2016-12-22 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| CN206387951U (en) * | 2016-12-30 | 2017-08-08 | 杭州朗奥光学科技有限公司 | A kind of high definition projection lens |
-
2016
- 2016-12-30 CN CN201611260825.2A patent/CN106597644B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011186269A (en) * | 2010-03-10 | 2011-09-22 | Fujifilm Corp | Wide-angle lens for projection, and projection type display device |
| CN203930190U (en) * | 2011-10-20 | 2014-11-05 | 富士胶片株式会社 | Zoom lens and projection-type display apparatus for projection |
| CN103454757A (en) * | 2012-06-05 | 2013-12-18 | 台达电子工业股份有限公司 | Projection zoom lens |
| JP2016218170A (en) * | 2015-05-18 | 2016-12-22 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| CN205485022U (en) * | 2016-03-28 | 2016-08-17 | 中山联合光电科技股份有限公司 | Optical system of high magnification |
| CN206387951U (en) * | 2016-12-30 | 2017-08-08 | 杭州朗奥光学科技有限公司 | A kind of high definition projection lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106597644A (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5041924B2 (en) | Zoom lens | |
| CN107422458B (en) | L-shaped short-focus full-high-definition projection lens with low F number | |
| JP2013190742A5 (en) | ||
| CN104570286A (en) | Micro fisheye camera lens and head-mounted display equipment | |
| CN106896480A (en) | A kind of projector's telecentricity zoom lens | |
| CN107490846B (en) | Projection lens | |
| CN108279486A (en) | A kind of high pixel video meeting optical imaging system of big image planes | |
| CN105511061A (en) | Super-wide high-definition optical lens | |
| CN207380325U (en) | A kind of long focus optical system | |
| CN106597644B (en) | High definition projection lens | |
| CN109298584B (en) | Projection lens and projector | |
| CN111983788A (en) | Wide-angle lens | |
| CN204359996U (en) | A kind of miniature fish eye lens and wear display device | |
| CN111580247A (en) | Integrally-focusing high-definition micro-projection lens | |
| WO2021102685A1 (en) | Large-field-of-view high-image-quality eyepiece optical system and device | |
| CN206387951U (en) | A kind of high definition projection lens | |
| CN107121767B (en) | High-resolution projection lens for DLP (digital light processing) engineering projector | |
| CN115047591B (en) | Projection lens and projection device | |
| CN108535836B (en) | Full high definition projection lens | |
| CN109633868A (en) | The micro- throwing projection lens of burnt high definition in one kind | |
| CN110333591A (en) | A kind of 0.95mm vehicle-mounted high-definition looks around optical system and its imaging method | |
| CN110873955A (en) | Ultra-short-focus lens for projector | |
| CN110764221B (en) | Projection lens system | |
| CN208297811U (en) | A kind of video conference optical imaging system | |
| CN109491060B (en) | Ultrashort-focus objective lens for desktop projection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |