US3626176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling device for film-projector light-units
Assignee: Individual
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Filing: 1970-02-09
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Granted: 1971-12-07
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Expires: 1990-02-09
Abstract
Abstract A cooling device designed to eliminate the danger of glass breakage of the reflector mirror and exfoliation of the film coating thereon as caused under heat radiation from the light source such as a xenon lamp. The device includes air-cooling means for the reflector mirror and a double-wall construction of the light-source casing defining water jackets therein. Cooling air supplied to the bottom of the casing is directed through inner and outer concentric annular passages formed in the supply duct and, owing to the particular formation of the outlet ends of the respective air passages, opening close to the central aperture formed in the reflector mirror, flows radially along the inner and outer surfaces of the mirror. Cooling water is supplied to circulate through the water jackets formed in the bottom and sidewalls of the casing.
Inventors
- 👤 Taisuke Tsugami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:23
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
261 words
In a light-source unit for a film projector, including a light-source lamp, an ellipsoidal reflector mirror, a casing surrounding said light-source lamp and said ellipsoidal reflector mirror, and an air duct connected to the bottom of said casing axially thereof, a cooling device comprising: means for cooling said reflector mirror, including inner and outer concentric air passages (26,27) of annular cross section arranged in said air duct (6) to receive cooling air and having respective outlet ends presented to an aperture (1a) formed in the center of said reflector mirror (1), said outlet ends being formed to direct the cooling air leaving said annular air passages outwardly along the inner and outer surfaces of said reflector mirror, respectively; a double-wall structure forming the peripheral wall portion of said casIng which receives infrared or heat radiation from said light-source lamp directly and through said reflector mirror, said double-wall structure defining therein water jacket means (12,13) to receive cooling water for circulation therethrough; and said casing comprising a lower water jacket (12) defined in a double-wall structure forming that peripheral portion of said casing which receives infrared rays as emitted by the light source and transmitted through said reflector mirror and an upper water jacket (13) defined in another double-wall structure forming that peripheral portion of said casing which receives infrared rays directly from the light source, said lower and upper water jackets being interconnected by a communicating tube (8) with an inlet tube (7) and an outlet tube (9) for cooling water being connected to said lower and upper water jackets, respectively.
Claim 2
Dependent Claim
261 words
In a light-source unit for a film projector, including a light-source lamp, an ellipsoidal reflector mirror, a casing surrounding said light-source lamp and said ellipsoidal reflector mirror, and an air duct connected to the bottom of said casing axially thereof, a cooling device comprising: means for cooling said reflector mirror, including inner and outer concentric air passages (26,27) of annular cross section arranged in said air duct (6) to receive cooling air and having respective outlet ends presented to an aperture (1a) formed in the center of said reflector mirror (1), said outlet ends being formed to direct the cooling air leaving said annular air passages outwardly along the inner and outer surfaces of said reflector mirror, respectively; a double-wall structure forming the peripheral wall portion of said casIng which receives infrared or heat radiation from said light-source lamp directly and through said reflector mirror, said double-wall structure defining therein water jacket means (12,13) to receive cooling water for circulation therethrough; and said casing comprising a lower water jacket (12) defined in a double-wall structure forming that peripheral portion of said casing which receives infrared rays as emitted by the light source and transmitted through said reflector mirror and an upper water jacket (13) defined in another double-wall structure forming that peripheral portion of said casing which receives infrared rays directly from the light source, said lower and upper water jackets being interconnected by a communicating tube (8) with an inlet tube (7) and an outlet tube (9) for cooling water being connected to said lower and upper water jackets, respectively.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |