GB501645A - Improvements in or relating to optical image viewing arrangements - Google Patents
Improvements in or relating to optical image viewing arrangementsInfo
- Publication number
- GB501645A GB501645A GB2129037A GB2129037A GB501645A GB 501645 A GB501645 A GB 501645A GB 2129037 A GB2129037 A GB 2129037A GB 2129037 A GB2129037 A GB 2129037A GB 501645 A GB501645 A GB 501645A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheet
- relating
- cellulose acetate
- optical image
- diffusing
- 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
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
501,645. Moulding lenticulated surfaces. BROWNE; C. O., and HOLMAN, H. E. July 31, 1937, Nos. 21290 and 27707. Drawings to Specification. [Class 87 (ii)] [Also in Groups XVI and XX] The surface of a body is provided with a series of spiral or concentric grooves of increasing inclination to form a Fresnel lens. The grooves may be engraved directly on the surface or they may be pressed on by a stamper formed by electrotyping from a wax mother. The body may be a transparent sheet of cellulose acetate or artificial resin and may have one surface rendered diffusing or it may be united to a glass backing sheet which may be diffusing. The sheet may also be silvered on the back or front. If desired the stamping dies may be produced by hardening an engraved soft body such as cellulose acetate or silica gel. Specification 371,893, [Group XX], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2129037A GB501645A (en) | 1937-07-31 | 1937-07-31 | Improvements in or relating to optical image viewing arrangements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2129037A GB501645A (en) | 1937-07-31 | 1937-07-31 | Improvements in or relating to optical image viewing arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB501645A true GB501645A (en) | 1939-02-28 |
Family
ID=10160376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2129037A Expired GB501645A (en) | 1937-07-31 | 1937-07-31 | Improvements in or relating to optical image viewing arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB501645A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2463280A (en) * | 1943-02-16 | 1949-03-01 | Frank J Kaehni | Spectroscope grating having spaced zones of diffraction lines |
| GB2123739A (en) * | 1982-04-30 | 1984-02-08 | James Christopher Ernes Harper | Profile forming apparatus |
-
1937
- 1937-07-31 GB GB2129037A patent/GB501645A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2463280A (en) * | 1943-02-16 | 1949-03-01 | Frank J Kaehni | Spectroscope grating having spaced zones of diffraction lines |
| GB2123739A (en) * | 1982-04-30 | 1984-02-08 | James Christopher Ernes Harper | Profile forming apparatus |
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