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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: 2009-09-23
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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  • Projection optical system and image projection apparatus using the systems
  • Projection optical system and image projection apparatus using the systems
  • 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 -41.022...

Embodiment 2

[0150] i ri di ni vi

[0151] 1 123.812 3.811 1.51633 64.1

[0152] 2 -311.006 0.150

[0153] 3 52.482 1.700 1.69680 55.5

[0154] 4 24.197 4.815

[0155] 5 116.908 1.700 1.69680 55.5

[0156] 6 32.549 7.522

[0157] 7 -29.619 1.700 1.69680 55.5

[0158] 8 117.550 6.366

[0159] 9 -123.304 4.773 1.83400 37.2

[0160] 10 -35.252 (variable D10)

[0161] 11 80.895 4.891 1.63980 34.5

[0162] 12 -90.556 26.694

[0163] 13 374.281 1.700 1.72000 50.2

[0164] 14 19.853 1.14497

[0165] 15 28.366 2.91551 1.61293 37.0

[0166] 16 96.680 11.971

[0167] 17 (aperture) 0.300

[0168] 18 50.441 4.457 1.65844 50.9

[0169] 19 -31.225 (variable D19)

[0170] 20 -43.587 1.700 1.83400 37.2

[0171] 21 31.140 4.955 1.51633 64.1

[0172] 22 -31.150 (variable D22)

[0173] 23 -26.247 2.200 1.83400 37.2

[0174] 24 58.237 0.150

[0175] 25 49.007 5.542 1.80518 25.4

[0176] 26 -29.326 (variable D26)

[0177] 27 -38.974 1.700 1.80518 25.4

[0178] 28 26.858 11.775 1.60311 6...

Embodiment 3

[0189] i ri di ni vi

[0190] 1 115.356 3.593 1.72000 50.2

[0191] 2 -1411.068 0.065

[0192] 3 50.378 1.582 1.69680 55.5

[0193] 4 23.001 6.117

[0194] 5 1208.830 1.790 1.69680 55.5

[0195] 6 35.770 6.198

[0196] 7* -36.326 1.626 1.69680 55.5

[0197] 8 92.829 7.506

[0198] 9 -106.651 4.537 1.83400 37.2

[0199] 10 -35.136 (variable D10)

[0200] 11 43.718 5.028 1.63980 34.5

[0201] 12 -895.592 22.986

[0202] 13 23.758 1.702 1.65160 58.6

[0203]14 15.326 19.386

[0204] 15 (aperture) 4.52962

[0205] 16 73.460 4.509 1.51633 64.1

[0206] 17 -26.599 (variable D17)

[0207] 18 -51.513 1.618 1.83400 37.2

[0208] 19 29.012 5.719 1.51823 58.9

[0209] 20 -29.072 (variable D20)

[0210] 21 -29.187 1.605 1.83400 37.2

[0211] 22 51.207 0.150

[0212] 23 42.108 5.421 1.80518 25.4

[0213] 24 -42.704 (variable D24)

[0214] 25 -68.804 1.605 1.80518 25.4

[0215] 26 24.157 11.464 1.60311 60.6

[0216] 27 -24.499 1.702 1.80518 25.4

[0217] 28 -41.387 (...

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Abstract

The present invention provides a zoom optical system with a wide field of view and a long reverse focal length. The system is provided in order from front to back: a first lens unit with a negative refractive power that is in a stationary state for zooming, and a lens unit with a positive refractive power. The second lens unit, the third lens unit with negative refractive power, the fourth lens unit, the fifth lens unit with negative refractive power, and the sixth lens unit with positive refractive power in a fixed state for zooming. When the focal length of the first lens unit L1 is denoted as f1, the air-converted back focal length is denoted as bf, and the focal length of the entire system at the wide-angle end is denoted as fw, the following conditions are satisfied: 1.7<bf / (|f1|·fw)1 / 2<2.3 . By satisfying this condition, various aberrations caused by zooming are corrected satisfactorily while achieving miniaturization of the entire lens system, and excellent optical performance is obtained on the entire screen.

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 Patents(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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