FR475318A - Heat ray absorption filter for projection devices - Google Patents
Heat ray absorption filter for projection devicesInfo
- Publication number
- FR475318A FR475318A FR475318DA FR475318A FR 475318 A FR475318 A FR 475318A FR 475318D A FR475318D A FR 475318DA FR 475318 A FR475318 A FR 475318A
- Authority
- FR
- France
- Prior art keywords
- heat ray
- ray absorption
- absorption filter
- projection devices
- projection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE475318X | 1913-07-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR475318A true FR475318A (en) | 1915-05-04 |
Family
ID=1513223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR475318D Expired FR475318A (en) | 1913-07-19 | 1914-07-18 | Heat ray absorption filter for projection devices |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR475318A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2464887A (en) * | 1946-01-12 | 1949-03-22 | American Optical Corp | Heat absorbing screen for projectors |
US2552185A (en) * | 1950-06-02 | 1951-05-08 | Eastman Kodak Co | Illuminator for optical projectors |
US2552184A (en) * | 1950-06-02 | 1951-05-08 | Eastman Kodak Co | Illuminator for optical projectors |
US2688271A (en) * | 1950-03-31 | 1954-09-07 | Gretener Edgar | Illumination system for the projection of pictures |
-
1914
- 1914-07-18 FR FR475318D patent/FR475318A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2464887A (en) * | 1946-01-12 | 1949-03-22 | American Optical Corp | Heat absorbing screen for projectors |
US2688271A (en) * | 1950-03-31 | 1954-09-07 | Gretener Edgar | Illumination system for the projection of pictures |
US2552185A (en) * | 1950-06-02 | 1951-05-08 | Eastman Kodak Co | Illuminator for optical projectors |
US2552184A (en) * | 1950-06-02 | 1951-05-08 | Eastman Kodak Co | Illuminator for optical projectors |
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