GB670605A - Improvements relating to optical lenses - Google Patents
Improvements relating to optical lensesInfo
- Publication number
- GB670605A GB670605A GB320650A GB320650A GB670605A GB 670605 A GB670605 A GB 670605A GB 320650 A GB320650 A GB 320650A GB 320650 A GB320650 A GB 320650A GB 670605 A GB670605 A GB 670605A
- Authority
- GB
- United Kingdom
- Prior art keywords
- indentations
- grooves
- oct
- optical lenses
- improvements relating
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
670,605. Lenses. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Oct. 8, 1948 [Oct. 9, 1947], No. 3206/50. Divided out of 670,575. Drawing to Specification. Class 97 (i). An optical lens comprises several sections of the same or substantially the same thickness assembled edge-to-edge, the sections being so formed with grooves or indentations and being assembled in such order as to produce a lens of the Fresnel type with grooves or indentations, on one or both surfaces thereof, whose sides differ in inclination in a systematic manner from one groove or indenation to another or from one series of grooves or indentations to another series thereof. The description is substantially identical with that in Specification 670,575.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB320650A GB670605A (en) | 1947-10-09 | 1947-10-09 | Improvements relating to optical lenses |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB320650A GB670605A (en) | 1947-10-09 | 1947-10-09 | Improvements relating to optical lenses |
Publications (1)
Publication Number | Publication Date |
---|---|
GB670605A true GB670605A (en) | 1952-04-23 |
Family
ID=9753953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB320650A Expired GB670605A (en) | 1947-10-09 | 1947-10-09 | Improvements relating to optical lenses |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB670605A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3622223A (en) * | 1970-01-16 | 1971-11-23 | Brakell Products Pty Ltd | Projection screens |
-
1947
- 1947-10-09 GB GB320650A patent/GB670605A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3622223A (en) * | 1970-01-16 | 1971-11-23 | Brakell Products Pty Ltd | Projection screens |
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