US3762814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooled light projection unit
Assignee: Kimberly Clark Tissue Co
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Filing: 1971-04-26
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Granted: 1973-10-02
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Expires: 1991-04-26
Abstract
Abstract An air-cooled light projection unit for use in apparatus in which film is exposed to light, such as apparatus for projecting or duplicating film images. A heat-radiating light source is enclosed in a housing from which light is projected toward a film located at an illumination station. Walls within the housing define a tortuous cooling passageway through the housing. The passageway extends first past the illumination station between the film and the light source and secondly past a heat radiating portion of said light source. Blowers are associated with the housing for causing a flow of cooling air through the passageway. A method performed by the projection unit is disclosed in which cooling air is introduced into the light projection unit, directed past the illumination station between the light source and the film, and past a heat-emitting portion of the light source. The cooling air is then emitted from the light projection unit.
Inventors
- 👤 P Kitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:26
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/26; G03B27/18; G03B27/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
209 words
Apparatus for duplicating film, wherein a master film and a duplicate film are brought into overlying relationship with one another and light is projected through said master film and onto said duplicate film at an illumination station, comprising a heat radiating light source which directs light toward said films when they are disposed at said illumination station, a housing at least partially enclosing said light source, said housing defining an opening through which light is projected toward said films at said illumination station, wall means within said housing which define a tortuous passageway through said housing, said passageway including a first portion extending past said illumination station between said film and said light source, and a second portion connected to said first portion and extending past said heat-radiating light source, said wall means including, two spaced-apart reflecting elements extending and diverging from said light source toward said illumination station, and a transparent plate extending between and joined to the divergent ends of said two reflecting elements, said first portion of said passageway extending past only the side of said plate opposite said heat-radiating light source, and means associated with said housing for causing a flow of cooling air through said passageway from said first portion to said second portion.
Claim 2
Dependent Claim
209 words
Apparatus for duplicating film, wherein a master film and a duplicate film are brought into overlying relationship with one another and light is projected through said master film and onto said duplicate film at an illumination station, comprising a heat radiating light source which directs light toward said films when they are disposed at said illumination station, a housing at least partially enclosing said light source, said housing defining an opening through which light is projected toward said films at said illumination station, wall means within said housing which define a tortuous passageway through said housing, said passageway including a first portion extending past said illumination station between said film and said light source, and a second portion connected to said first portion and extending past said heat-radiating light source, said wall means including, two spaced-apart reflecting elements extending and diverging from said light source toward said illumination station, and a transparent plate extending between and joined to the divergent ends of said two reflecting elements, said first portion of said passageway extending past only the side of said plate opposite said heat-radiating light source, and means associated with said housing for causing a flow of cooling air through said passageway from said first portion to said second portion.
Claim 3
Dependent Claim
56 words
Apparatus for duplicating film according to claim 1, wherein said means associated with said housing for causing a flow of cooling air through said passageway comprise a first blower for introducing said cooling air into said first portion of said passageway, and a second blower for exhausting said cooling-air from said second portion of said passageway.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |