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US4925295A
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US
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Projection display apparatus
Assignee: Casio Computer Co Ltd
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Filing: 1988-09-14
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Granted: 1990-05-15
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Expires: 2008-09-14
Abstract
Abstract A projection display apparatus includes a light source unit for generating light for image formation, an electro-optical display device for displaying an optical image by utilizing the light emitted from the light source unit, and an enlarging/projection lens. The light source unit, the display device, and the projection lens are accommodated in a housing with vent openings. The housing also includes a fan for cooling the interior of the housing with cool air and a cooler for maintaining a display panel within a predetermined temperature range. The light source unit includes a lamp and a reflector and is designed not to cause image deformation and formation of a shadow of a discharge portion. In order to display a television image on the display device, all television image display circuit units excluding an antenna are accommodated in the housing. The enlarging/projection lens can control a magnification and a focal point of the image projected on the screen.
Inventors
- 👤 Masahiro Ogawa
- 👤 Tatsuo Shimazaki
- 👤 Osamu Umeda
- 👤 Toshihiro Aoki
- 👤 Toru Nakakusu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:48
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/3144; G; G03; G03B; G03B21/00; G03B21/14; G03B21/16; H04N5/00; H04N5/74; H04N5/7416; H04N5/7441; H04N9/315; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133382; G02F1/133385
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
A projection display apparatus comprising: a light source unit comprising a parabolic reflector, a lamp, and a metal plate, said lamp being provided with a light-emitting portion, an anode, and a cathode, said anode and said cathode being located to interpose said light-emitting portion, said light-emitting portion being located at a focal point of said reflector, and said anode and said cathode being present on an axis of said reflector, one of said anode and said cathode being connected to a thin plate-like connecting terminal parallel to an axis of a focal point of said reflector, and said metal plate being adapted to entirely cover at least sides of said reflector; a display unit having a display device and a cooler coupled to said display device; an optical unit having at least one lens to enlarge a image displayed on said display device; cooling means for cooling at least said light source unit; and a housing for accommodating said light source unit, said display unit, said optical unit and said cooling means.
Claim 2
Dependent Claim
172 words
A projection display apparatus comprising: a light source unit comprising a parabolic reflector, a lamp, and a metal plate, said lamp being provided with a light-emitting portion, an anode, and a cathode, said anode and said cathode being located to interpose said light-emitting portion, said light-emitting portion being located at a focal point of said reflector, and said anode and said cathode being present on an axis of said reflector, one of said anode and said cathode being connected to a thin plate-like connecting terminal parallel to an axis of a focal point of said reflector, and said metal plate being adapted to entirely cover at least sides of said reflector; a display unit having a display device and a cooler coupled to said display device; an optical unit having at least one lens to enlarge a image displayed on said display device; cooling means for cooling at least said light source unit; and a housing for accommodating said light source unit, said display unit, said optical unit and said cooling means.
Claim 3
Dependent Claim
36 words
An apparatus according to claim 1, wherein said connecting terminal is made of a metal film and is connected to a connecting lead, a surface of which is parallel to the light reflected by said reflector.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 2, wherein said metal plate comprises a protective member for receiving broken pieces of said lamp when said lamp is exploded.
Claim 5
Dependent Claim
177 words
A projection display apparatus comprising: a light source unit comprising a parabolic reflector, a lamp, and a metal plate, said lamp being provided with a light-emitting portion, an anode, and a cathode, said anode and said cathode being located to interpose said light-emitting portion, said light-emitting portion being located at a focal point of said reflector, and said anode and said cathode being present on an axis of said reflector, and said metal plate being adapted to entirely cover at least sides of said reflector; a display unit having a display device and a cooler coupled to said display device; a honeycomb core located between said light source unit and said display unit, and made of a metal film having a surface directed parallel to the light reflected by said reflector; an optical unit having at least one lens to enlarge an image displayed on said display device; cooling means for cooling at least said light source unit; and a housing for accommodating said light source unit, said display unit, said optical unit, and said cooling means.
Claim 6
Dependent Claim
177 words
A projection display apparatus comprising: a light source unit comprising a parabolic reflector, a lamp, and a metal plate, said lamp being provided with a light-emitting portion, an anode, and a cathode, said anode and said cathode being located to interpose said light-emitting portion, said light-emitting portion being located at a focal point of said reflector, and said anode and said cathode being present on an axis of said reflector, and said metal plate being adapted to entirely cover at least sides of said reflector; a display unit having a display device and a cooler coupled to said display device; a honeycomb core located between said light source unit and said display unit, and made of a metal film having a surface directed parallel to the light reflected by said reflector; an optical unit having at least one lens to enlarge an image displayed on said display device; cooling means for cooling at least said light source unit; and a housing for accommodating said light source unit, said display unit, said optical unit, and said cooling means.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 4, wherein said honeycomb core is mounted on said metal plate of said light source.
Claim 8
Dependent Claim
18 words
An apparatus according to claim 5, wherein one end of said lamp is supported by said honeycomb core.
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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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |