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US5473339A
Expired / Lapsed
US
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Liquid crystal projector
Assignee: Sanyo Electric Co Ltd
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Filing: 1992-05-19
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Granted: 1995-12-05
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Expires: 2012-05-19
Abstract
Abstract In a liquid crystal projector having a light source and liquid crystal panel units disposed in the optical paths, reflecting means is disposed on the emanating side of the projector for reflecting the light in a direction approximately perpendicular to the optical axis, and change-over means is coupled to the liquid crystal panel units for reversing the lateral directions of images.
Inventors
- 👤 Keiichi Kanatani
- 👤 Shunichi Kishimoto
- 👤 Yasuo Funazo
- 👤 Takashi Miwa
- 👤 Kazuhiro Kono
- 👤 Goro Hamagishi
- 👤 Kiyoshi Hosoi
- 👤 Shinji Shiogai
- 👤 Koichi Fujiwara
- 👤 Takao Matsumura
- 👤 Shigeru Kobayashi
- 👤 Shinichi Otsuki
- 👤 Kenji Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:41
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; H04N9/3141; H04N9/317
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A liquid crystal projector comprising: a light source; separating means for separating light from the light source into three light components; liquid crystal panel units disposed in respective optical paths for the three light components separated by the light separating means, each of the liquid crystal panel units to modulate the light component in accordance with image data, each of the liquid crystal panel units including a) a liquid crystal panel disposed as inclined at a predetermined angle with a plane perpendicular to an optical path in accordance with a preference angle of field, b) a condenser lens, and c) an incident-side polarizing plate, said incident-side polarizing plate is arranged perpendicular to the optical path; and optically composing means for optically composing the three light components as transmitted through the liquid crystal panel units.
Claim 2
Dependent Claim
134 words
A liquid crystal projector comprising: a light source; separating means for separating light from the light source into three light components; liquid crystal panel units disposed in respective optical paths for the three light components separated by the light separating means, each of the liquid crystal panel units to modulate the light component in accordance with image data, each of the liquid crystal panel units including a) a liquid crystal panel disposed as inclined at a predetermined angle with a plane perpendicular to an optical path in accordance with a preference angle of field, b) a condenser lens, and c) an incident-side polarizing plate, said incident-side polarizing plate is arranged perpendicular to the optical path; and optically composing means for optically composing the three light components as transmitted through the liquid crystal panel units.
Claim 3
Dependent Claim
24 words
A liquid crystal projector as defined in claim 1, wherein the predetermined angle of inclination of the liquid crystal panel is about 3 degrees.
Claim 4
Dependent Claim
20 words
A liquid crystal projector as defined in claim 1, wherein the condenser lens is arranged perpendicular to the optical path.
Claim 5
Dependent Claim
32 words
A liquid crystal projector as defined in claim 3, wherein the polarizing plate on an incident side is affixed to a rear surface of the condenser lens with a transparent silicon adhesive.
Claim 6
Dependent Claim
73 words
A liquid crystal projector as defined in claim 1, wherein on an emanating side of the optical composing means, a reflecting means is disposed for reflecting light composed by the optical composing means in a direction approximately perpendicular to an optical axis of the optical composing means; and change-over means is coupled to each of the liquid crystal panel units for reversing a lateral direction of images in the liquid crystal panel units.
Claim 7
Dependent Claim
22 words
A liquid crystal projector as defined in claim 5 wherein the reflecting means is removable, and the change-over means is on-off controllable.
Claim 8
Dependent Claim
84 words
A liquid crystal projector as defined in claim 1 wherein the light source is insertable inside a generally parabolic reflector through an opening formed in the reflector centrally thereof, and the light source comprises an end member having an outwardly projecting stepped portion and removably attachable to the reflector with the stepped portion in bearing contact with the opening end of the reflector, and a lamp connected to the end member and having a light-emitting portion positioned at the focal point of the reflector.
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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) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |