CN107422464B - Zoom projection optical system - Google Patents
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- CN107422464B CN107422464B CN201710762633.XA CN201710762633A CN107422464B CN 107422464 B CN107422464 B CN 107422464B CN 201710762633 A CN201710762633 A CN 201710762633A CN 107422464 B CN107422464 B CN 107422464B
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
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- 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
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Abstract
The invention discloses a zoom projection optical system, which sequentially comprises the following components in the projection direction: the lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, an equivalent prism and a DMD light-emitting chip; the first lens group can move back and forth relative to the DMD chip, and the focal power of the first lens group is negative; the second lens group can move back and forth relative to the DMD chip, and the focal power of the second lens group is positive; the third lens group can move back and forth relative to the DMD chip, and the focal power of the third lens group is positive; the fourth lens group can move back and forth relative to the DMD chip, and the focal power of the fourth lens group is positive. The invention has small volume, high resolution, no focusing picture is still clear when zooming, and the invention is suitable for micro-projection illumination and can be produced in batch.
Description
[ field of technology ]
The present invention relates to a zoom projection optical system, and more particularly, to a small-volume, high-resolution zoom projection optical system.
[ background Art ]
With the development of projection technology in recent years, projectors are widely used in the fields of home use, office use and the like, and zoom projection lenses can project pictures of different sizes in a fixed space, so that the zoom projection lenses are deeply favored by wide users due to flexibility and convenience.
The zoom projection lens in the current market mostly adopts a two-group design structure, the size of a projection picture changes from a Wide end to a Tele end or from the Tele end to the Wide end, but focusing group pictures in the lens can be clearly regulated again, and the lens is inconvenient to use; there are also few lenses that can achieve the effect of enlarging or reducing the frame at a fixed distance without focusing, and the frame is still clear, but the system is only suitable for the structure of a 3LCD lighting system, and has large limitation in use, and in order to achieve this function, the system often adopts more lenses, the lens is large in volume, high in manufacturing sensitivity, and difficult in mass production, and no zoom projection lens in the market at present can overcome the above drawbacks at the same time.
The present invention has been made in view of the above drawbacks.
[ invention ]
The technical problem to be solved by the invention is to provide a zoom projection optical system which has small volume, high resolution, no focusing picture and clear and is suitable for micro-projection illumination during zooming and mass production.
In order to solve the technical problems, the invention adopts the following technical scheme: a zoom projection optical system, characterized in that: the lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, an equivalent prism and a DMD light-emitting chip;
the first lens group can move back and forth relative to the DMD chip, and the focal power of the first lens group is negative;
the second lens group can move back and forth relative to the DMD chip, and the focal power of the second lens group is positive;
the third lens group can move back and forth relative to the DMD chip, and the focal power of the third lens group is positive;
the fourth lens group can move back and forth relative to the DMD chip, and the focal power of the fourth lens group is positive.
The zoom projection optical system according to the present invention, wherein the first lens group includes a first lens, a second lens, and a third lens which are sequentially arranged in a projection direction; the second lens group comprises a fourth lens which is a biconvex lens; the third lens group comprises a diaphragm and a fifth lens, and the fifth lens is a biconvex aspheric lens; the fourth lens group includes a sixth lens, a seventh lens, an eighth lens, and a ninth lens, which are sequentially disposed in the projection direction.
The zoom projection optical system according to the above, wherein the first lens power is negative, the second lens power is negative, the third lens power is negative, the fourth lens power is positive, the fifth lens power is positive, the sixth lens power is negative, the seventh lens power is positive, the eighth lens power is positive, and the ninth lens power is positive.
The zoom projection optical system is characterized in that the DMD chip is arranged in a deviating way by 100% -110% relative to the optical axis.
A zoom projection optical system as described above, wherein the firstThe focal power of one lens group is negative, and the focal power satisfies the following conditions: 0.09<|φ 310 |<0.11, the optical power of the second lens group is positive, and the optical power satisfies: 0.042<|φ 320 |<0.044, the third lens group having positive optical power, the optical power satisfying: 0.044<|φ 330 |<0.046, the optical power of the fourth lens group is positive, and the optical power satisfies: 0.039<|φ 340 |<0.041。
The zoom projection optical system as described above, wherein the second lens is a glass aspheric lens, both surfaces are bent to the DMD chip, and the optical power is negative, which satisfies the following conditions: 0.032<|φ 2 |<0.034, both sides of the third lens face away from the DMD chip, and abbe numbers satisfy: 80<VD 3 <95。
The zoom projection optical system as described above, wherein the diaphragm is located between the fourth lens and the fifth lens, and in the zooming process, the diaphragm moves along with the fifth lens, and the distance from the fifth lens remains unchanged; the fifth lens adopts a glass aspheric surface, and Abbe numbers satisfy the following: 80<VD 5 <95。
The zoom projection optical system as described above, wherein the sixth lens and the seventh lens are cemented lenses, and the optical power satisfies: -0.049<φ 67 <-0.048, the eighth lens power being positive, the power satisfying: 0.053<|φ 8 |<0.054, wherein the ninth lens is a glass aspheric surface, the focal power is positive, and the focal power satisfies the following conditions: 0.015<|φ 9 |<0.017。
The zoom projection optical system according to the above, wherein the second lens, the fifth lens and the ninth lens are glass aspherical lenses.
A zoom projection optical system as described above, wherein the aspherical surface shapes of the second lens, the fifth lens and the ninth lens satisfy the following equation:
in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, and k is the conic coefficient; when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, and when the k coefficient is greater than 0, the surface shape curve of the lens is oblate; a, a 1 To a 8 The coefficients corresponding to the radial coordinates are respectively represented.
Compared with the prior art, the zoom projection optical system achieves the following effects:
1. the invention has very high resolution, can support the DMD chip with the pixel point of 5.47 micrometers, and realizes the projection ratio of 1.1.
2. The invention realizes that focusing is not needed in the zooming process under the state of white light illumination, the picture is still clear, and the invention is applicable to the micro-projection field of LED illumination.
3. The invention has the advantages that through reasonable distribution of the system focal power, the number of moving groups is small, the total length is small, the assembly sensitivity is greatly reduced, and batch production can be carried out.
[ description of the drawings ]
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of the present invention;
description of the drawings: 100. a DMD chip; 200. an equivalent prism; 310. a first lens group; 320. a second lens group; 330. a third lens group; 340. a fourth lens group; 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. a ninth lens; 10. a diaphragm.
[ detailed description ] of the invention
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a zoom projection optical system is provided with, in order in a projection direction: a first lens group 310, a second lens group 320, a third lens group 330, a fourth lens group 340, an equivalent prism 200, a dmd light emitting chip 100;
the first lens group 310 can move back and forth relative to the DMD chip 100, and the focal power of the first lens group 310 is negative; the first lens group can move back and forth relative to the DMD chip to compensate the change amount of back focus when the lens is assembled;
the second lens group 320 can move back and forth relative to the DMD chip 100, and the optical power of the second lens group 320 is positive;
the third lens group 330 can move back and forth relative to the DMD chip 100, and the focal power of the third lens group 330 is positive;
the fourth lens group 340 can move back and forth relative to the DMD chip 100, and the optical power of the fourth lens group 340 is positive. The second lens group, the third lens group and the fourth lens group are linkage groups and move together relative to the DMD chip.
As shown in fig. 1, in the present embodiment, the first lens group 310 includes a first lens 1, a second lens 2, and a third lens 3, which are disposed in this order in the projection direction; the second lens group 320 includes a fourth lens 4, and the fourth lens 4 is a biconvex lens; the third lens group 330 includes a stop 10 and a fifth lens 5, the fifth lens 5 being a biconvex aspherical lens; the fourth lens group 340 includes a sixth lens 6, a seventh lens 7, an eighth lens 8, and a ninth lens 9, which are sequentially disposed in the projection direction.
As shown in fig. 1, in the present embodiment, the focal power of the first lens 1 is negative, the focal power of the second lens 2 is negative, the focal power of the third lens 3 is negative, the focal power of the fourth lens 4 is positive, the focal power of the fifth lens 5 is positive, the focal power of the sixth lens 6 is negative, the focal power of the seventh lens 7 is positive, the focal power of the eighth lens 8 is positive, and the focal power of the ninth lens 9 is positive.
As shown in fig. 1, in this embodiment, the DMD chip 100 is offset from the optical axis by 100% -110%. The DMD chip is 0.3 inch, the pixel size is 5.37 micrometers, and the Nyquist frequency is 93lp/mm.
As shown in fig. 1, in the present embodiment, the optical power of the first lens group 310 is negative, and the optical power satisfies: 0.09<|φ 310 |<0.11, wherein the optical power of the second lens group 320 is positive, and the optical power satisfies: 0.042<|φ 320 |<0.044, the third lens group 330 has positive optical power, the optical power satisfying: 0.044<|φ 330 |<0.046, the optical power of the fourth lens group 340 is positive, and the optical power satisfies: 0.039<|φ 340 |<0.041; when the lens groups are arranged according to the focal power parameters, a reverse long-distance structure can be formed, smaller total length and larger projection ratio are realized, and the projection ratio of the optical system can reach 1.1; the second lens group, the third lens group and the fourth lens group adopt a linkage mode, so that the image plane position in the zooming process is not moved, the focusing is not needed in the zooming process, and the picture is still clear.
As shown in fig. 1, in this embodiment, the second lens 2 is a glass aspheric lens, and both sides of the second lens are bent towards the DMD chip, and the optical power is negative, so as to satisfy the following requirements: 0.032<|φ 2 |<0.034, wherein both sides of the third lens 3 face away from the DMD chip 100, and the abbe number satisfies: 80<VD 3 <95; the chromatic aberration of magnification of a large view field can be corrected, two sides of the third lens 3 face away from the DMD chip, the incidence angle of light entering the rear group lens can be reduced, and the assembly sensitivity of the lens is reduced.
As shown in fig. 1, in the present embodiment, the diaphragm 10 is located between the fourth lens 4 and the fifth lens 5, and during zooming, the diaphragm 10 moves along with the fifth lens 5, and the distance from the fifth lens 5 remains unchanged; the fifth lens 5 is a glass aspheric surface, and the abbe number satisfies: 80<VD 5 <95; the optical system can correct position chromatic aberration, diaphragm spherical aberration and diaphragm coma of different multiplying powers and different wavelengths, so that clear pictures in a zooming process can be realized under a white light state without focusing, and the optical system can be suitable for the micro-projection field of LED illumination.
As shown in fig. 1, in the present embodiment, the sixth lens 6 and the seventh lens 7 are cemented lenses, and the optical power satisfies: -0.049<φ 67 <-0.048, the eighthThe lens 8 has positive optical power, which satisfies: 0.053<|φ 8 |<0.054, the ninth lens 9 is a glass aspheric surface, the focal power is positive, and the focal power satisfies: 0.015<|φ 9 |<0.017; when the lenses of the fourth lens group are distributed according to the focal power, the residual high-grade astigmatism, distortion and other aberration of the front group can be corrected, high resolution and high illumination can be realized, the assembly sensitivity of the rear group lenses can be reduced, and batch production can be realized. In this embodiment, the sixth lens 6 and the seventh lens 7 are bonded by optical glue.
As shown in fig. 1, in the present embodiment, the second lens 2, the fifth lens 5, and the ninth lens 9 are glass aspherical lenses.
As shown in fig. 1, in the present embodiment, the aspherical surface shapes of the second lens 2, the fifth lens 5, and the ninth lens 9 satisfy the following equations:
in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, and k is the conic coefficient; when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, and when the k coefficient is greater than 0, the surface shape curve of the lens is oblate; a, a 1 To a 8 The coefficients corresponding to the radial coordinates are respectively represented.
The following cases 1.1 show 1.17 times of projection ratio and zoom ratio, 720P resolution, and are suitable for practical design parameters of a zoom projection lens of a 0.3 inch DMD chip:
the coefficients of the first surface S3 of the second lens 2 are:
k：-41.0072
a 1 ：0
a 2 ：0.0016728418
a 3 ：-6.3322811e-005
a 4 ：1.8922002e-006
a 5 ：-3.591768e-008
a 6 ：3.8013839e-010
a 7 ：-1.6938385e-012
the coefficients of the second surface S4 of the second lens 2 are:
k：-12.63998
a 1 ：0
a 2 ：0.0032340299
a 3 ：-0.0001524481
a 4 ：5.8146112e-006
a 5 ：-1.4324976e-007
a 6 ：1.9730567e-009
a 7 ：-1.2516632e-011
the coefficients of the first surface S9 of the fifth lens 5 are:
k：-164.9035
a 1 ：0
a 2 ：0.00013399816
a 3 ：-7.4207806e-006
a 4 ：1.6627463e-007
a 5 ：-2.6788372e-009
a 6 ：1.5980767e-011
the coefficients of the second surface S10 of the fifth lens 5 are:
k：-1.333241
a 1 ：0
a 2 ：-7.1006819e-005
a 3 ：-9.5561899e-008
a 4 ：-2.1913686e-008
a 5 ：3.1279102e-010
a 6 ：-2.6701552e-012
the coefficients of the first surface S16 of the ninth lens 9 are:
k：132.0208
a 1 ：0
a 2 ：1.4879231e-005
a 3 ：1.4891465e-006
a 4 ：-7.9007827e-008
a 5 ：2.3598575e-009
a 6 ：-3.2883325e-011
a 7 ：1.7940477e-013
the coefficients of the second surface S17 of the ninth lens 9 are:
k：-10.37094
a 1 ：0
a 2 ：6.0725258e-005
a 3 ：9.6770165e-007
a 4 ：-5.5417837e-008
a 5 ：1.8058628e-009
a 6 ：-2.6250756e-011
a 7 ：1.5033884e-013
the projection range of the 1.17-fold zoom projection lens is 0.5m to infinity, and the second lens group 320, the third lens group 330, and the fourth lens group 340 remain stationary when the 1.17-fold zoom projection lens is in focus. When the throw distance of the 1.17-fold zoom projection lens is set to 1m, the zoom movement interval range between the respective lens groups is as follows: the interval between the first lens group 310 and the second lens group 320 is 2.72 to 0.66mm, the interval between the second lens group 320 and the third lens group 330 is 12.0 to 11.39mm, and the interval between the third lens group 330 and the fourth lens group 340 is 3.46 to 5.67mm.
Claims (7)
1. The utility model provides a zoom projection optical system, its characterized in that, this zoom projection optical system comprises nine lenses of four lens group, has in the projection direction in proper order: a first lens group (310), a second lens group (320), a third lens group (330), a fourth lens group (340), an equivalent prism (200), a DMD light emitting chip (100);
the first lens group (310) can move back and forth relative to the DMD chip (100), and the focal power of the first lens group (310) is negative;
the second lens group (320) can move back and forth relative to the DMD chip (100), and the focal power of the second lens group (320) is positive;
the third lens group (330) can move back and forth relative to the DMD chip (100), and the focal power of the third lens group (330) is positive;
the fourth lens group (340) can move back and forth relative to the DMD chip (100), and the focal power of the fourth lens group (340) is positive;
the first lens group (310) has a negative optical power, which satisfies: 0.09<|φ 310 |<0.11, wherein the optical power of the second lens group (320) is positive, and the optical power satisfies: 0.042<|φ 320 |<0.044, the third lens group (330) having an optical power of positive, the optical power satisfying: 0.044<|φ 330 |<0.046, the optical power of the fourth lens group (340) is positive, the optical power satisfies: 0.039<|φ 340 |<0.041；
The first lens group (310) comprises a first lens (1), a second lens (2) and a third lens (3) which are sequentially arranged along the projection direction; the second lens group (320) comprises a fourth lens (4), and the fourth lens (4) is a biconvex lens; the third lens group (330) comprises a diaphragm (10) and a fifth lens (5), and the fifth lens (5) is a biconvex aspheric lens; the fourth lens group (340) includes a sixth lens (6), a seventh lens (7), an eighth lens (8), and a ninth lens (9) which are sequentially arranged in the projection direction;
the optical power of the first lens (1) is negative, the optical power of the second lens (2) is negative, the optical power of the third lens (3) is negative, the optical power of the fourth lens (4) is positive, the optical power of the fifth lens (5) is positive, the optical power of the sixth lens (6) is negative, the optical power of the seventh lens (7) is positive, the optical power of the eighth lens (8) is positive, and the optical power of the ninth lens (9) is positive.
2. A zoom projection optical system according to claim 1, wherein the DMD chip (100) is offset from the optical axis by 100% -110%.
3. A zoom projection optical system according to claim 1, wherein the second lens (2) is a glass aspherical lens, both sides of which are bent towards the DMD chip, the optical power being negative, satisfying: 0.032<|φ 2 |<0.034, wherein both sides of the third lens (3) face away from the DMD chip (100), and Abbe numbers satisfy: 80<VD 3 <95。
4. A zoom projection optical system according to claim 1, wherein the diaphragm (10) is located between the fourth lens (4) and the fifth lens (5), and wherein the diaphragm (10) follows the fifth lens (5) during zooming, and wherein the distance from the fifth lens (5) remains unchanged; the fifth lens (5) adopts a glass aspheric surface, and Abbe numbers satisfy the following: 80<VD 5 <95。
5. A zoom projection optical system according to claim 1, wherein the sixth lens (6) and the seventh lens (7) are cemented lenses, the optical power satisfying: -0.049<φ 67 <-0.048, the eighth lens (8) has a positive optical power, the optical power satisfying: 0.053<|φ 8 |<0.054, wherein the ninth lens (9) is a glass aspheric surface, the focal power is positive, and the focal power satisfies the following conditions: 0.015<|φ 9 |<0.017。
6. A zoom projection optical system according to claim 1, wherein the second lens (2), the fifth lens (5) and the ninth lens (9) are glass aspherical lenses.
7. A zoom projection optical system according to claim 6, wherein the aspherical surface shapes of the second lens (2), the fifth lens (5) and the ninth lens (9) satisfy the following equation:
in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, and k is the conic coefficient; when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens is elliptical, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, and when the k coefficient is greater than 0, the surface shape curve of the lens is oblate; a, a 1 To a 8 The coefficients corresponding to the radial coordinates are respectively represented.
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| CN111381346B (en) | 2018-12-30 | 2021-05-11 | 上海微电子装备（集团）股份有限公司 | Photoetching projection objective lens |
| CN111885364B (en) * | 2020-06-24 | 2023-08-15 | 歌尔微电子有限公司 | Micro-projection device and electronic device |
| CN111897116A (en) * | 2020-08-24 | 2020-11-06 | 中山联合光电科技股份有限公司 | Projection optical system and projection apparatus |
| CN114594574B (en) * | 2022-03-31 | 2023-11-10 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
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|---|---|---|---|---|
| JP2008076513A (en) * | 2006-09-19 | 2008-04-03 | Ricoh Co Ltd | Zoom lens, camera device, and personal digital assistant |
| JP2010170061A (en) * | 2009-01-26 | 2010-08-05 | Nikon Corp | Zoom lens system, image capturing apparatus, and method of manufacturing the zoom lens system |
| CN105487211A (en) * | 2016-01-07 | 2016-04-13 | 东莞市宇瞳光学科技股份有限公司 | Large-aperture, large-image surface ultra-wide angle zoom lens |
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| JP4659412B2 (en) * | 2004-08-27 | 2011-03-30 | キヤノン株式会社 | Zoom lens and image projection apparatus having the same |
| JP4642883B2 (en) * | 2008-06-23 | 2011-03-02 | 株式会社リコー | Zoom lens, camera, and portable information terminal device |
| CN207114865U (en) * | 2017-08-30 | 2018-03-16 | 中山联合光电科技股份有限公司 | A kind of zoom projecting optical device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008076513A (en) * | 2006-09-19 | 2008-04-03 | Ricoh Co Ltd | Zoom lens, camera device, and personal digital assistant |
| JP2010170061A (en) * | 2009-01-26 | 2010-08-05 | Nikon Corp | Zoom lens system, image capturing apparatus, and method of manufacturing the zoom lens system |
| CN105487211A (en) * | 2016-01-07 | 2016-04-13 | 东莞市宇瞳光学科技股份有限公司 | Large-aperture, large-image surface ultra-wide angle zoom lens |
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