US5754260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection type color liquid crystal optical apparatus
Assignee: AGC Inc
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Filing: 1997-02-27
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Granted: 1998-05-19
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Expires: 2017-02-27
Abstract
Abstract A light source optical system for projection 1, dichroic mirrors 21, 22 disposed to have a predetermined included angle beta , a reflection type liquid crystal optical element blocks 31-33 each including a closely contacted converging lens and having a reflection surface and a projection optical system 4 are provided, wherein the normal line of a dichroic mirror surface and the optical axis of incident light form an included angle alpha ; the normal line of the reflection surface and the optical axis of incident light form an included angle gamma ; light emitted from a light source is color-separated so as to become color lights; the color lights are rendered to be parallel light beams, and are modulated and reflected by means of the reflection type liquid crystal optical elements; the reflected light beams are color-synthesized; and the color-synthesized light is projected through a projection lens. A projection type color liquid crystal optical apparatus having a compact shape and a high brightness is obtainable.
Inventors
- 👤 Yoshiharu Ooi
- 👤 Tsuneo Wakabayashi
- 👤 Shigeyuki Serizawa
- 👤 Yoshiyuki Sonda
- 👤 Masaya Kunigita
- 👤 Yoshinori Hirai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:46
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/315; H04N9/3102; H04N9/3105
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
171 words
A projection type liquid crystal optical apparatus comprising: (a) a light source system comprising a light source that emits a light, a reflection mirror and a first aperture device; (b) a light modulation system configured to modulate a light which is emitted from an opening of said first aperture device, comprising, (b 1 ) a liquid crystal optical element having a front substrate with a transparent front electrode wherein minute concaves and convexes are formed on a surface of the front electrode or on an interface of the front substrate, a back substrate with reflective pixel electrodes, a liquid crystal and solidified matrix composite layer disposed between said front substrate and said back substrate, and (b 2 ) condenser lens having a convex surface and a plane surface facing said liquid crystal optical element; and (c) a light projection optical system comprising projection lenses and a second aperture device having an aperture, wherein a modulated light in said light modulation system is passed through the aperture of said second aperture device.
Claim 2
Dependent Claim
171 words
A projection type liquid crystal optical apparatus comprising: (a) a light source system comprising a light source that emits a light, a reflection mirror and a first aperture device; (b) a light modulation system configured to modulate a light which is emitted from an opening of said first aperture device, comprising, (b 1 ) a liquid crystal optical element having a front substrate with a transparent front electrode wherein minute concaves and convexes are formed on a surface of the front electrode or on an interface of the front substrate, a back substrate with reflective pixel electrodes, a liquid crystal and solidified matrix composite layer disposed between said front substrate and said back substrate, and (b 2 ) condenser lens having a convex surface and a plane surface facing said liquid crystal optical element; and (c) a light projection optical system comprising projection lenses and a second aperture device having an aperture, wherein a modulated light in said light modulation system is passed through the aperture of said second aperture device.
Claim 3
Dependent Claim
108 words
A projection type liquid crystal optical apparatus according to claim 1, further comprising a color separating and synthesizing system comprising two color separating and synthesizing layers being arranged in a horizontal plane with an included angle of 40° to 70° with respect to each other; wherein said light emitted from said light source system having an incident angle of a 1 , a 2 in a range of 20° to 35° with respect to each of said color separating and synthesizing layers, and three liquid crystal optical elements in said light modulation system being arranged for three color lights respectively separated by said color separating and synthesizing layers.
Claim 4
Dependent Claim
39 words
A projection type liquid crystal optical apparatus according to claim 1, wherein said first aperture device is configured to have a changeable aperture opening size and said second aperture device is configured to have a changeable aperture opening size.
Claim 5
Dependent Claim
39 words
A projection type liquid crystal optical apparatus according to claim 2, wherein said first aperture device is configured to have a changeable aperture opening size and said second aperture device is configured to have a changeable aperture opening size.
Claim 6
Dependent Claim
37 words
A projection type liquid crystal optical apparatus according to claim 1, wherein said condenser lens having a convex front surface and a plane back surface is attached to a front surface of said liquid crystal optical element.
Claim 7
Dependent Claim
36 words
A projection type liquid crystal optical apparatus according to claim 2, said condenser lens having a convex from surface and a plane back surface is attached to a front surface of said liquid crystal optical element.
Claim 8
Dependent Claim
36 words
A projection type liquid crystal optical apparatus according to claim 3, said condenser lens having a convex front surface and a plane back surface is attached to a front surface of said liquid crystal optical element.
Claim 9
Dependent Claim
36 words
A projection type liquid crystal optical apparatus according to claim 4, said condenser lens having a convex front surface and a plane back surface is attached to a front surface of said liquid crystal optical element.
Claim 10
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 1, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 11
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 2, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 12
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 3, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 13
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 4, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 14
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 5, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 15
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 6, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 16
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 7, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 17
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 8, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 18
Dependent Claim
30 words
A projection type liquid crystal optical apparatus according to claim 9, wherein said light emitted from said light source system has a collection angle less than or equal to 10°.
Claim 19
Dependent Claim
22 words
A projection type liquid crystal optical apparatus according to claim 2, wherein said color separating and synthesizing layers comprise a dichroic mirror.
Claim 20
Dependent Claim
37 words
A projection type liquid crystal optical apparatus according to claim 1, wherein an opening shape of said aperture of said first aperture device is similar to an opening shape of said aperture of said second aperture device.
Claim 21
Dependent Claim
37 words
A projection type liquid crystal optical apparatus according to claim 2, wherein an opening shape of said aperture of said first aperture device is similar to an opening shape of said aperture of said second aperture device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |