GB228704A - Improvements in condensers for optical projecting apparatus - Google Patents
Improvements in condensers for optical projecting apparatusInfo
- Publication number
- GB228704A GB228704A GB292324A GB292324A GB228704A GB 228704 A GB228704 A GB 228704A GB 292324 A GB292324 A GB 292324A GB 292324 A GB292324 A GB 292324A GB 228704 A GB228704 A GB 228704A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lenses
- lens
- condensers
- projecting apparatus
- illuminant
- 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
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Lens Barrels (AREA)
Abstract
228,704. Skennerton, W. I. Feb. 4, 1924, Lenses; optical-projection-apparatus.-Multiple lens condensers consist of two double convex lenses 2, 3, between which is situated a third lens 5 which is a converging meniscus or a planoconvex lens. The lenses are separated by rings 6 to act as distance-pieces, the rings in contact with the lenses nearer the illuminant being filled with asbestos. The meniscus lens is preferably placed nearer to the double convex lens which faces the illuminant. Flats are out on the sides of the lenses to facilitate ventilation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB292324A GB228704A (en) | 1924-02-04 | 1924-02-04 | Improvements in condensers for optical projecting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB292324A GB228704A (en) | 1924-02-04 | 1924-02-04 | Improvements in condensers for optical projecting apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB228704A true GB228704A (en) | 1925-02-12 |
Family
ID=9748603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB292324A Expired GB228704A (en) | 1924-02-04 | 1924-02-04 | Improvements in condensers for optical projecting apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB228704A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2600975A (en) * | 1951-02-10 | 1952-06-17 | American Optical Corp | Unitary condenser lens assembly mounting means for projectors |
US2905054A (en) * | 1954-07-07 | 1959-09-22 | Sandy B Logan | Reading glass and mounting |
US4796756A (en) * | 1988-04-11 | 1989-01-10 | Silor Optical Of Florida, Inc. | Optical lens carrier |
-
1924
- 1924-02-04 GB GB292324A patent/GB228704A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2600975A (en) * | 1951-02-10 | 1952-06-17 | American Optical Corp | Unitary condenser lens assembly mounting means for projectors |
US2905054A (en) * | 1954-07-07 | 1959-09-22 | Sandy B Logan | Reading glass and mounting |
US4796756A (en) * | 1988-04-11 | 1989-01-10 | Silor Optical Of Florida, Inc. | Optical lens carrier |
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