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Variable-power optical system, projection optical system, and image projection apparatus using the systems

A projection optical system and projection technology, applied in the field of projection optical systems, can solve problems such as unsatisfactory pupil position changes

Inactive Publication Date: 2007-11-28
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In addition, it is not ideal to change the pupil position on the side of the original image due to zooming or focusing.

Method used

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  • Variable-power optical system, projection optical system, and image projection apparatus using the systems
  • Variable-power optical system, projection optical system, and image projection apparatus using the systems
  • Variable-power optical system, projection optical system, and image projection apparatus using the systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] i ri di ni vi

[0114] 1 113.900 3.811 1.72000 50.2

[0115] 2 -2324.594 0.150

[0116] 3 51.859 1.600 1.69680 55.5

[0117] 4 23.124 6.166

[0118] 5 2309.678 1.600 1.69680 55.5

[0119] 6 35.836 6.493

[0120] 7 -36.287 1.600 1.69680 55.5

[0121] 8 107.216 7.128

[0122] 9 -95.912 4.560 1.83400 37.2

[0123] 10 -34.286 (variable D10)

[0124] 11 43.509 5.088 1.63980 34.5

[0125] 12 -1026.440 22.982

[0126] 13 24.184 1.700 1.65160 58.6

[0127] 14 15.689 20.56824

[0128] 15 (aperture) 4.33424

[0129] 16 75.917 4.468 1.51633 64.1

[0130] 17 -27.394 (variable D17)

[0131] 18 -52.882 1.500 1.83400 37.2

[0132] 19 29.124 5.708 1.51823 58.9

[0133] 20 -29.134 (variable D20)

[0134] 21 -28.832 1.600 1.83400 37.2

[0135] 22 53.636 0.150

[0136] 23 43.349 5.158 1.80518 25.4

[0137] 24 -43.359 (variable D24)

[0138] 25 -72.144 1.600 1.80518 25.4

[0139] 26 24.550 11.452 1.60311 60.6

[0140] 27 -24.560 1.600 1.80518 25.4

[0141] 28 -41.02...

Embodiment 2

[0149] i ri di ni vi

[0150] 1 123.812 3.811 1.51633 64.1

[0151] 2 -311.006 0.150

[0152] 3 52.482 1.700 1.69680 55.5

[0153] 4 24.197 4.815

[0154] 5 116.908 1.700 1.69680 55.5

[0155] 6 32.549 7.522

[0156] 7 -29.619 1.700 1.69680 55.5

[0157] 8 117.550 6.366

[0158] 9 -123.304 4.773 1.83400 37.2

[0159] 10 -35.252 (variable D10)

[0160] 11 80.895 4.891 1.63980 34.5

[0161] 12 -90.556 26.694

[0162] 13 374.281 1.700 1.72000 50.2

[0163] 14 19.853 1.14497

[0164] 15 28.366 2.91551 1.61293 37.0

[0165] 16 96.680 11.971

[0166] 17 (aperture) 0.300

[0167] 18 50.441 4.457 1.65844 50.9

[0168] 19 -31.225 (variable D19)

[0169] 20 -43.587 1.700 1.83400 37.2

[0170] 21 31.140 4.955 1.51633 64.1

[0171] 22 -31.150 (variable D22)

[0172] 23 -26.247 2.200 1.83400 37.2

[0173] 24 58.237 0.150

[0174] 25 49.007 5.542 1.80518 25.4

[0175] 26 -29.326 (variable D26)

[0176] 27 -38.974 1.700 1.80518 25.4

[0177] 28 26.858 11.775 1.60311 6...

Embodiment 3

[0187] i ri di ni vi

[0188] 1 115.356 3.593 1.72000 50.2

[0189] 2 -1411.068 0.065

[0190] 3 50.378 1.582 1.69680 55.5

[0191] 4 23.001 6.117

[0192] 5 1208.830 1.790 1.69680 55.5

[0193] 6 35.770 6.198

[0194] 7* -36.326 1.626 1.69680 55.5

[0195] 8 92.829 7.506

[0196] 9 -106.651 4.537 1.83400 37.2

[0197] 10 -35.136 (variable D10)

[0198] 11 43.718 5.028 1.63980 34.5

[0199] 12 -895.592 22.986

[0200] 13 23.758 1.702 1.65160 58.6

[0201] 14 15.326 19.386

[0202] 15 (aperture) 4.52962

[0203] 16 73.460 4.509 1.51633 64.1

[0204] 17 -26.599 (variable D17)

[0205] 18 -51.513 1.616 1.83400 37.2

[0206] 19 29.012 5.719 1.51823 58.9

[0207] 20 -29.072 (variable D20)

[0208] 21 -29.187 1.605 1.83400 37.2

[0209] 22 51.207 0.150

[0210] 23 42.108 5.421 1.80518 25.4

[0211] 24 -42.704 (variable D24)

[0212] 25 -68.804 1.605 1.80518 25.4

[0213] 26 24.157 11.464 1.60311 60.6

[0214] 27 -24.499 1.702 1.80518 25.4

[0215] 28 -41.387 ...

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Abstract

The invention provides a zoom optical system of a wide field angle and the reverse focal length, and is sequentially provided from front to back with: a first lens unit of negative light dioptric strength which is under the fixed state for zooming, a second lens unit of positive light dioptric strength, a third lens unit of negative light dioptric strength, a forth lens unit, a fifth lens unit of negative light dioptric strength, and a sixth lens unit of positive light dioptric strength which is under the fixed state for zooming. When the focal length of an L1 of the first lens unit is f1, and the air conversion reverse focal length is bf and the focal length of the whole system of a wide angle end is fw, the following condition can be satisfied: 1.7 less than bf / ((f1).fw)< 1 / 2 > less than 2.3. By satisfying the condition, while the zoom optical system of the wide field angle and the reverse focal length seeks the miniaturization of the whole lens system, each aberration caused by zooming can be modified well, and the whole picture has good optical performance.

Description

[0001] The present invention is a divisional application of patent application No. 200410056597.8 filed on August 11, 2004, entitled "Zoom Optical System, Projection Optical System, and Image Projection Device Using the System". technical field [0002] The present invention relates to a zoom optical system or a projection optical system, for example, a projection optical system suitable for an image projection device that enlarges and projects an original image onto a screen (projection surface). Background technique [0003] Conventionally, various liquid crystal projectors (image projection devices) using an image display element such as a liquid crystal display element and projecting an image (original image) displayed on the display element onto a screen surface (projection surface) have been proposed. [0004] In particular, liquid crystal projectors are widely used in conferences and presentation halls as devices capable of projecting images from a microcomputer or the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16G02B15/177G03B21/00H04N5/74H04N9/31G02B15/20G02B13/18
Inventor 山崎真司中山博喜
Owner CANON KK
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