CN113325552B - Middle focus lens structure for digital film projector - Google Patents
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- CN113325552B CN113325552B CN202110649507.XA CN202110649507A CN113325552B CN 113325552 B CN113325552 B CN 113325552B CN 202110649507 A CN202110649507 A CN 202110649507A CN 113325552 B CN113325552 B CN 113325552B
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- 230000005499 meniscus Effects 0.000 claims abstract description 90
- 238000005286 illumination Methods 0.000 claims abstract description 4
- 239000005304 optical glass Substances 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 210000000887 face Anatomy 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 210000001747 pupil Anatomy 0.000 claims description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 2
- 229910052601 baryte Inorganic materials 0.000 claims description 2
- 239000010428 baryte Substances 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 6
- 230000004075 alteration Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000005331 crown glasses (windows) Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
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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
- G02B13/0055—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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- 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
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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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
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a middle-focus lens structure for a digital film projector, which is characterized in that a fourth biconvex lens, a third biconvex lens, a second biconcave lens, a second biconvex lens, a second negative meniscus lens, a third positive meniscus lens, a second plano-convex lens, a fixed diaphragm A, a second positive meniscus lens, a first biconcave lens, a first biconvex lens, a first positive meniscus lens, a first plano-concave lens and a first negative meniscus lens are sequentially arranged on a lens body along the incident direction of illumination light. The invention can improve the maximum relative aperture D/f' of the projection lens to 1/2 on the premise that the projection ratio and the rear working distance of the middle-focus projection lens are limited, the lens volume is small, the imaging quality is excellent, and the resolution can reach or exceed the requirement of high-definition pictures of a 4K digital film projector.
Description
Technical Field
The invention relates to the technical field of digital film projection, in particular to a middle-focus lens structure for a digital film projector.
Background
With the continuous upgrade of modern theaters in the direction of wide screen, high brightness, luxury and comfort and miniaturization, the wide application of 4K digital cinema projectors in theaters has promoted the technical development of high-definition, high-brightness digital projection lenses. The application of digital projection lenses is limited by the size of the cinema fixed site and the screen, it is not practical to simply pursue a projection lens with a large field of view and a low throw ratio, and the throw ratio of short-focus digital projection lenses has been limited to 0.8: 1 and 1.4-1, and therefore, the focal length of most digital projection lenses is limited to 18-25 mm. The mid-focus digital projection lens throw ratio has been limited to 1.7: 1-2: 1, and is used for a fixed site of a large cinema, so that the focal length of the middle-focus digital projection lens is limited to be between 40 and 50 mm. The rear working distance of the middle-focus digital projection lens is still limited to be 100-150 mm, if the clear aperture of the digital projection lens is increased, the volume of the lens is increased easily, the imaging quality is reduced, the lens structure can be complicated, the production manufacturability is poor, the technical development of the middle-focus digital projection lens in the aspects of high definition and high brightness is seriously influenced by the adverse factors, and the technical problem to be solved in the field is also solved urgently.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a middle focus lens structure for a digital cinema projector, which can increase the maximum relative aperture D/f' of the projection lens to 1/2, and has a small lens volume, excellent imaging quality, and resolution ratio capable of reaching or exceeding the requirement of high-definition picture suitable for a 4K digital cinema projector.
To solve the above technical problems, the present invention provides a middle focus lens structure for a digital cinema projector, comprising: a fourth biconvex lens 13, a third biconvex lens 12, a second biconcave lens 11, a second biconvex lens 10, a second negative meniscus lens 9, a third positive meniscus lens 8, a second plano-convex lens 7, a fixed stop a, a second positive meniscus lens 6, a first biconcave lens 5, a first biconvex lens 4, a first positive meniscus lens 3, a first plano-concave lens 2 and a first negative meniscus lens 1; the fourth biconvex lens 13, the third biconvex lens 12, the second biconcave lens 11, the second biconvex lens 10, the second negative meniscus lens 9, the third positive meniscus lens 8, the second plano-convex lens 7, the fixed diaphragm A, the second positive meniscus lens 6, the first biconcave lens 5, the first biconvex lens 4, the first positive meniscus lens 3, the first plano-concave lens 2 and the first negative meniscus lens 1 are sequentially arranged in the lens body along the incident direction of the illumination light; the third biconvex lens 12 and the second biconcave lens 11 are double-lens combinations, and the surface of the third biconvex lens 12 with the large curvature absolute value faces the image surface; the second negative meniscus lens 9 and the third positive meniscus lens 8 are double-cemented lens groups, and the convex surface of the second negative meniscus lens 9 faces the image surface; the second positive meniscus lens 6 and the first biconcave lens 5 are double-lens combination, and the concave surface of the second positive meniscus lens 6 faces to the image surface; the surface of the fourth lenticular lens 13 having a large absolute value of curvature faces the image surface; the surface of the second biconvex lens 10 with a small absolute value of curvature faces the image surface; the convex surface of the second plano-convex lens 7 faces the image surface; the surface of the first biconvex lens 4 with a large absolute value of curvature faces the image surface; the convex surface of the first positive meniscus lens 3 faces the image surface; the concave surface of the first plano-concave lens 2 faces the image surface; the first negative meniscus lens 1 has a concave surface facing the image plane.
The first negative meniscus lens 1 and the first plano-concave lens 2 are arranged at the forefront of the lens, the requirement of the large view field of the lens is mainly considered to be met, and the two negative lenses can bear the incident and emergent heights of light rays of each view field. The maximum diameter of the entrance pupil is determined by imaging the diaphragm A by the front group consisting of all the lenses in front of the diaphragm A, the focal power and the position of each lens in the front group are reasonably distributed, and the aperture of the first negative meniscus lens 1 and the first plano-concave lens 2 can be obviously reduced. It should be noted that by utilizing the convergence property of the positive lens, which can deflect the light toward the optical axis, the arrangement of the first positive meniscus lens 3 and the first biconvex lens 4 can significantly reduce the aperture of all the lenses in the rear group of the diaphragm a. The effect of the arrangement of the lens groups can not only meet the requirement that the large visual field and the maximum relative aperture D/f' of the lens reach 1/2, but also reduce the volume of the whole lens. Meanwhile, the arrangement of all the lenses in the rear group of the diaphragm A and the distribution of the focal power mainly balance and reduce the off-axis aberration generated by the lenses in the front group under the conditions of large visual field and maximum relative aperture. And under the conditions of meeting the requirements of focal length, back working distance, aperture and image height, the aberration and parameters of the whole lens are optimized by using optical design software.
Preferably, the first negative meniscus lens 1 and the first double-convex lens 4 are made of dense crown optical glass, the first plano-concave lens 2 is made of dense barium flint optical glass, the first positive meniscus lens 3 and the second double-convex lens 10 are made of dense flint optical glass, the first double-concave lens 5, the third double-convex lens 12 and the fourth double-convex lens 13 are made of fluorine crown optical glass, the second positive meniscus lens 6 is made of flint optical glass, the second plano-convex lens 7 and the second negative meniscus lens 9 are made of dense multicolored flint optical glass, and the third positive meniscus lens 8 and the second double-concave lens 11 are made of multicolored flint optical glass.
In the lens group, in order to balance and correct the on-axis and off-axis aberration generated by the optical lens in the visible spectrum range, especially the chromatic aberration difficult to correct, the optimized combination of glass materials with high refractive index, low dispersion or high dispersion and low refractive index is adopted, particularly, the new material of the fluoro crown glass with ultrahigh dispersion coefficient FK61 is selected for 3 lenses at the rear part of the lens, and the optical optimization design of a computer ensures that the imaging quality of the lens is excellent, the resolution of the lens reaches or exceeds the technical index of high definition which can be matched with a 4K digital film projector, and the color reducibility is good.
Preferably, the optical performance parameter range of the lens structure is: the focal length f' is 40 mm-50 mm; the relative aperture D/f is 1/2-1/3, wherein D is the diameter of the entrance pupil; the trans-far ratio is 2.5-3.5; the throw ratio was 1.7: 1-2: 1. under the condition, the lens structure can obtain better imaging quality, and the lens volume is smaller.
Preferably, the air space between the first negative meniscus lens 1 and the first plano-concave lens 2 is 0.8652mm, the air space between the first plano-concave lens 2 and the first positive meniscus lens 3 is 1.1096mm, the air space between the first positive meniscus lens 3 and the first biconvex lens 4 is 2.5681mm, the air space between the first biconvex lens 4 and the first biconcave lens 5 is 0.8859mm, the air space between the second positive meniscus lens 6 and the second biconvex lens 7 is 2.3896mm, the air space between the second biconvex lens 7 and the third positive meniscus lens 8 is 0.1435mm, the air space between the second negative meniscus lens 9 and the second biconvex lens 10 is 0.1792mm, the air space between the second biconvex lens 10 and the second biconcave lens 11 is 0.0754mm, the air space between the third biconvex lens 12 and the fourth biconvex lens 13 is 0.0311, and the air space between the fixed meniscus lens a and the second biconvex lens 11 is 0.4449mm, as expressed by the air space value when the focal length of the lens is 1 mm. The arrangement of the air intervals among the 10 lens groups can not only finely correct the sensitive aberration generated by the lens, but also improve the production manufacturability of the lens and is easier to process and produce.
Preferably, the lens structure is scaled to a focal length, the full-field image height diameter adjustment range is 20 mm-35 mm, and the lens structure is suitable for 1.2 inch and 1.38 inch display chip digital cinema projectors. After the parameters of focal length, field of view, relative aperture and inverse-far ratio of the specific lens are determined, the lens structure is scaled according to the focal length, and the matching relation of each main aberration is properly balanced and adjusted, so that the high-brightness and high-definition projection lens can be obtained, and is suitable for 1.2-inch and 1.38-inch digital film projectors with display chips of different specifications.
The invention has the beneficial effects that: the maximum relative aperture D/f' of the invention can reach 1/2, and the focal length of the lens meets the requirement that the projection ratio is 1.7: 1-2: 1, the adjusting range of the contrast ratio and the full-field image height can completely match with the digital film projectors with display chips of different specifications of 1.2 inches and 1.38 inches; the arrangement of the lens structure and the selection of the material of each lens are all on the premise of ensuring the maximum view field, the maximum relative aperture and the large back-to-far ratio of the lens system, the volume of the lens is reduced as much as possible, and the manufacturability of the lens processing is improved to the maximum extent; through computer aided optimization design, various aberrations generated by the optical lens are perfectly corrected, so that the transfer function MTF value of each field of view at 50 line pairs/mm frequency can reach more than 0.8 when the optical system has the maximum relative aperture of 1/2 and the image height of 1.38 inches, and the resolution of the projection lens reaches or exceeds the picture requirements of high brightness and high definition of a 4K digital film projector.
Drawings
FIG. 1 is a schematic view of a focal lens structure according to the present invention.
FIG. 2 is a diagram of the light trace of the focusing lens of the present invention.
Wherein, 1, a first negative meniscus lens; 2. a first plano-concave lens; 3. a first positive meniscus lens; 4. a first biconvex lens; 5. a first biconcave lens; 6. a second positive meniscus lens; 7. a second plano-convex lens; 8. a third positive meniscus lens; 9. a second negative meniscus lens; 10. a second biconvex lens; 11. a second biconcave lens; 12. a third biconvex lens; 13. a fourth lenticular lens.
Detailed Description
As shown in fig. 1, a mid-focus lens structure for a digital cinema projector includes: the lens comprises a lens body, and a fourth double convex lens 13, a third double convex lens 12, a second double concave lens 11, a second double convex lens 10, a second negative meniscus lens 9, a third positive meniscus lens 8, a second plano-convex lens 7, a fixed diaphragm A, a second positive meniscus lens 6, a first double concave lens 5, a first double convex lens 4, a first positive meniscus lens 3, a first plano-concave lens 2 and a first negative meniscus lens 1 which are sequentially arranged in the lens body along the incident direction of illumination light; the third biconvex lens 12 and the second biconcave lens 11 are double-lens combinations, and the surface of the third biconvex lens 12 with the large curvature absolute value faces the image surface; the second negative meniscus lens 9 and the third positive meniscus lens 8 are double-cemented lens groups, and the convex surface of the second negative meniscus lens 9 faces the image surface; the second positive meniscus lens 6 and the first biconcave lens 5 are double-lens combination, and the concave surface of the second positive meniscus lens 6 faces to the image surface; the surface of the fourth lenticular lens 13 having a large absolute value of curvature faces the image surface; the surface of the second biconvex lens 10 with a small absolute value of curvature faces the image surface; the convex surface of the second plano-convex lens 7 faces the image surface; the surface of the first biconvex lens 4 with a large absolute value of curvature faces the image surface; the convex surface of the first positive meniscus lens 3 faces the image surface; the concave surface of the first plano-concave lens 2 faces the image surface; the first negative meniscus lens 1 has a concave surface facing the image plane.
In this embodiment, the relative positions between the 10 lens groups are represented by the value of the air space when the focal length of the lens is 1mm, the air space between the first negative meniscus lens 1 and the first plano-concave lens 2 is 0.8652mm, the air space between the first plano-concave lens 2 and the first positive meniscus lens 3 is 1.1096mm, the air space between the first positive meniscus lens 3 and the first biconvex lens 4 is 2.5681mm, the air space between the first biconvex lens 4 and the biconvex lenses 5 and 6 is 0.8859mm, the air space between the biconvex lenses 5 and 6 and the second plano-convex lens 7 is 2.3896mm, the air space between the second biconvex lens 7 and the biconvex lenses 8 and 9 is 0.1435mm, the air space between the biconvex lenses 8 and 9 and the second biconvex lens 10 is 0.1792mm, the air space between the second biconvex lens 10 and the biconvex lenses 11 and 12 is 0.0754mm, and the air space between the biconvex lenses 11 and 12 and the fourth biconvex lens 13 is 0.0311 mm. Wherein the fixed diaphragm a is arranged in front of the second plano-convex lens 7 at an air separation of 0.4449mm from the plano-convex lens 7.
In this embodiment, the first negative meniscus lens 1 and the first biconvex lens 4 are made of dense crown optical glass, and both are made of the domestic H-ZK7 brand. The first plano-concave lens 2 is made of barite optical glass and made of a domestic H-ZBAF5 brand. The first positive meniscus lens 3 and the second biconvex lens 10 are made of heavy flint optical glass and respectively adopt the brands of H-ZF7LA and H-ZF 13. The first biconcave lens 5, the third biconvex lens 12 and the fourth biconvex lens 13 are made of fluorine crown optical glass, and are made of the brand name of H-FK61 made by China. The second positive meniscus lens 6 is made of flint optical glass and is made of a domestic H-F2 brand. The second plano-convex lens 7 and the second negative meniscus lens 9 are made of gorgeous flint optical glass and are made of domestic H-ZLAF50E and H-ZLAF 52A. The third positive meniscus lens 8 and the second double concave lens 11 are made of a gorgeous flint optical glass material and adopt the national H-LAF53 and H-LAF4 brands respectively. In other embodiments, the same series of optical glass materials with other domestic and foreign brands can be adopted, and the technical effect of the application can be achieved.
Specific structural design parameters of the lens structure of embodiment 1 are shown in table 1. The lens structure shown in Table 1 has a relative aperture D/f' of 1/2 and a focal length of 1 mm.
The lens structure of the embodiment 1 scales the focal length of the lens according to the market demand, the focal length range of the lens is between 40mm and 50mm, the high diameter range of the full-field image is between 20mm and 35mm, the range of the inverse-far ratio of the lens is between 2.5 and 3.5, the range of the relative aperture D/f is between 1/2 and 1/3, and the requirement that the projection ratio of the lens is 1.7 can be met: 1 and 2: 1, the lens is suitable for digital film projectors with display chips of different specifications, such as 1.2 inches, 1.38 inches and the like.
Table 1 optical parameters of lens structure of embodiment 1
Fig. 2 is a schematic diagram showing ray traces of the lens structure of embodiment 1 of the present application, which shows characteristic ray courses of the respective fields of view of the lens structure of embodiment 1, and incident heights of the characteristic rays on respective lens surfaces, which determine clear apertures of respective lenses in the lens structure.
Claims (3)
1. A mid-focus lens structure for a digital cinema projector, characterized by comprising thirteen lenses in total, specifically comprising: a fourth biconvex lens (13), a third biconvex lens (12), a second biconcave lens (11), a second biconvex lens (10), a second negative meniscus lens (9), a third positive meniscus lens (8), a second plano-convex lens (7), a fixed diaphragm A, a second positive meniscus lens (6), a first biconcave lens (5), a first biconvex lens (4), a first positive meniscus lens (3), a first plano-concave lens (2) and a first negative meniscus lens (1); the lens comprises a lens body, and a fourth double convex lens (13), a third double convex lens (12), a second double concave lens (11), a second double convex lens (10), a second negative meniscus lens (9), a third positive meniscus lens (8), a second plano convex lens (7), a fixed diaphragm A, a second positive meniscus lens (6), a first double concave lens (5), a first double convex lens (4), a first positive meniscus lens (3), a first plano concave lens (2) and a first negative meniscus lens (1) which are sequentially arranged along the incident direction of illumination light; the third biconvex lens (12) and the second biconcave lens (11) are double cemented lens groups, and the surface of the third biconvex lens (12) with the large curvature absolute value faces the image surface; the second negative meniscus lens (9) and the third positive meniscus lens (8) are double-cemented lens groups, and the convex surface of the second negative meniscus lens (9) faces to the image surface; the second positive meniscus lens (6) and the first biconcave lens (5) are double combined lenses, and the concave surface of the second positive meniscus lens (6) faces to the image surface; the surface of the fourth biconvex lens (13) with a large absolute value of curvature faces the image surface; the surface of the second biconvex lens (10) with a small absolute value of curvature faces the image surface; the convex surface of the second plano-convex lens (7) faces the image surface; the surface of the first biconvex lens (4) with a large curvature absolute value faces the image surface; the convex surface of the first positive meniscus lens (3) faces the image surface; the concave surface of the first plano-concave lens (2) faces the image surface; the concave surface of the first negative meniscus lens (1) faces the image surface;
the range of optical performance parameters of the lens structure is as follows: the focal length f' is 40 mm-50 mm; the relative aperture D/f is 1/2-1/3, wherein D is the diameter of the entrance pupil; the trans-far ratio is 2.5-3.5; the throw ratio was 1.7: 1-2: 1;
expressed by an air space value when the focal length of the lens is 1mm, the air space between the first negative meniscus lens (1) and the first plano-concave lens (2) is 0.8652mm, the air space between the first plano-concave lens (2) and the first positive meniscus lens (3) is 1.1096mm, the air space between the first positive meniscus lens (3) and the first biconvex lens (4) is 2.5681mm, the air space between the first biconvex lens (4) and the first biconcave lens (5) is 0.8859mm, the air space between the second positive meniscus lens (6) and the second biconvex lens (7) is 2.3896mm, the air space between the second biconvex lens (7) and the third positive meniscus lens (8) is 0.1435mm, the air space between the second negative meniscus lens (9) and the second biconvex lens (10) is 0.1792mm, the air space between the second biconvex lens (10) and the second concave lens (11) is 0.0754mm, and the air space between the third biconvex lens (12) and the fourth biconvex lens (13) is 031 lens (13 mm), the air space between the fixed diaphragm A and the second plano-convex lens (7) is 0.4449 mm.
2. The middle focus lens structure for a digital cinema projector according to claim 1, characterized in that the first negative meniscus lens (1) and the first biconvex lens (4) are both made of a dense crown-based optical glass material, the first plano-concave lens (2) is made of a barite-based optical glass material, the first positive meniscus lens (3) and the second biconvex lens (10) are both made of a dense flint-based optical glass material, the first biconcave lens (5), the third biconvex lens (12) and the fourth biconvex lens (13) are made of fluorine crown optical glass, the second positive meniscus lens (6) is made of flint optical glass, the second plano-convex lens (7) and the second negative meniscus lens (9) are made of multicolored flint optical glass, and the third positive meniscus lens (8) and the second biconcave lens (11) are made of multicolored flint optical glass.
3. The mid-focus lens arrangement for a digital cinema projector according to claim 1, wherein the lens arrangement is scaled for focal length, with a full field-of-view image height diameter adjustment range of 20mm to 35mm, suitable for 1.2 inch and 1.38 inch display chip digital cinema projectors.
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| JP2009237400A (en) * | 2008-03-28 | 2009-10-15 | Fujinon Corp | Variable power optical system and imaging apparatus |
| CN109212727B (en) * | 2017-07-07 | 2021-04-06 | 中强光电股份有限公司 | Projector and projection lens |
| CN109445065B (en) * | 2018-11-01 | 2020-10-16 | 南京信息职业技术学院 | 10-group 13-piece type lens structure for digital film projector |
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