US5032021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal projector
Assignee: Sanyo Electric Co Ltd
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Filing: 1990-10-10
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Granted: 1991-07-16
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Expires: 2010-10-10
Abstract
Abstract A liquid crystal display unit comprising a condenser lens, incident-side polarizing plate, liquid crystal panel and emanating-side polarizing plate is disposed in an optical path from a light source toward a projection lens. A cooler comprising a closed flat platelike glass container and a refrigerant enclosed in the container with a vacuum space of specified volume left therein is joined to each of the incident-side polarizing plate and the liquid crystal panel over an effective image area. The incident-size polarizing plate and the liquid crystal panel are prevented from overheating by the spontaneous convection and evaporation of the refrigerant and the condensation thereof within the space.
Inventors
- 👤 Keiichi Kanatani
- 👤 Shunichi Kishimoto
- 👤 Haruhisa Kosaka
- 👤 Goro Hamagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:08
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133382; G02F1/133385; H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7441; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/3144; H04N9/315; H04N9/3167
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
A liquid crystal projector comprising a transmitting matrix-type liquid crystal display unit disposed in an optical path from a light source toward a projection lens for modulating light in accordance with image data to display images on a screen in the rear of the projection lens, the liquid crystal display unit having joined thereto a flat platelike cooler over the effective image area of the unit, the cooler comprising: a flat platelike glass container made of two flat glass plates opposed to each other with a gap therebetween and formed by sealing off the gap along the outer peripheral edges of the glass plates, a refrigerant enclosed in the glass container with a vacuum space of specified volume left therein, and radiator means provided on the glass container for the vacuum space.
Claim 2
Dependent Claim
132 words
A liquid crystal projector comprising a transmitting matrix-type liquid crystal display unit disposed in an optical path from a light source toward a projection lens for modulating light in accordance with image data to display images on a screen in the rear of the projection lens, the liquid crystal display unit having joined thereto a flat platelike cooler over the effective image area of the unit, the cooler comprising: a flat platelike glass container made of two flat glass plates opposed to each other with a gap therebetween and formed by sealing off the gap along the outer peripheral edges of the glass plates, a refrigerant enclosed in the glass container with a vacuum space of specified volume left therein, and radiator means provided on the glass container for the vacuum space.
Claim 3
Dependent Claim
56 words
The liquid crystal projector as defined in claim 1 wherein the liquid crystal display unit comprises a polarizing plate on the incident-side, a liquid crystal panel having a liquid crystal operable at the position of desired pixels with an electric signal in accordance with image data from outside, and a polarizing plate on the emanating side.
Claim 4
Dependent Claim
54 words
The liquid crystal projector as defined in claim 2 wherein the incident-side polarizing plate is disposed away from the liquid crystal panel, and coolers are joined respectively to the liquid crystal panel on the surface thereof on the incident-side and to the incident-side polarizing plate on the surface thereof closer to the light source.
Claim 5
Dependent Claim
55 words
The liquid crystal projector as defined in claim 2 wherein the incident-side polarizing plate is disposed away from the liquid crystal panel, and coolers are joined respectively to the liquid crystal panel on the surface thereof on the emanating side and to the incident-side polarizing plate on the surface thereof closer to the light source.
Claim 6
Dependent Claim
30 words
The liquid crystal projector as defined in claim 1 wherein the radiator means comprises radiator fins attached directly to the glass wall defining the vacuum space of the glass container.
Claim 7
Dependent Claim
62 words
The liquid crystal projector as defined in claim 1 wherein the radiator means comprises a sealed heat pipe containing a small amount of working fluid, the heat pipe having a base end portion attached to a condenser portion of the glass container and a forward end portion extending to the position away from the glass container and provided with the radiator fins.
Claim 8
Dependent Claim
51 words
The liquid crystal projector as defined in claim 1 wherein the radiator means comprises a pipe having a base end portion in communication with the condenser portion of the glass container and a forward end portion extending to the position away from the glass container and provided with the radiator fins.
Claim 9
Dependent Claim
27 words
The liquid crystal projector as defined in claim 1 wherein the glass container is internally provided with nuclei positioned outside the effective image area for producing bubbles.
Claim 10
Dependent Claim
30 words
The liquid crystal projector as defined in claim 1 wherein the glass container has a glass frame provided between the two flat glass plates along the outer peripheral edges thereof.
Claim 11
Dependent Claim
46 words
The liquid crystal projector as defined in claim 1 wherein the glass container is formed by interposing minute glass beads or fine glass fibers between the two flat glass plates and sealing off the gap with frit along the outer peripheral edges of the glass plates.
Claim 12
Dependent Claim
45 words
The liquid crystal projector as defined in claim 1 wherein the two flat glass plates have rough surfaces opposed to each other, and the gap therebetween is sealed off with frit along the outer peripheral edges of the glass plates to form the glass container.
Claim 13
Dependent Claim
53 words
The liquid crystal projector as defined in claim 1 wherein the flat glass plate of the glass container is formed on the inner surface thereof with a guide ridge positioned close to the liquid level of the refrigerant and having at least one end inclined downward toward the side wall of the container.
Claim 14
Dependent Claim
53 words
The liquid crystal projector as defined in claim 1 wherein the flat glass plate of the glass container is formed in the inner surface thereof with a guide furrow positioned close to the liquid level of the refrigerant and having at least one end inclined downward toward the side wall of the container.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |