GB876861A - Improvements in and relating to view finders - Google Patents
Improvements in and relating to view findersInfo
- Publication number
- GB876861A GB876861A GB18044/58A GB1804458A GB876861A GB 876861 A GB876861 A GB 876861A GB 18044/58 A GB18044/58 A GB 18044/58A GB 1804458 A GB1804458 A GB 1804458A GB 876861 A GB876861 A GB 876861A
- Authority
- GB
- United Kingdom
- Prior art keywords
- corrugations
- wave length
- relating
- view finders
- frame
- 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
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/14—Viewfinders
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
-
- 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
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/02—Viewfinders
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
- Viewfinders (AREA)
Abstract
Corrugations may be formed on a glass or synthetic resin body, e.g. the frame carrier of an albada type photographic view finder, by roughening a surface thereof, as by sandblasting or grinding, and then smoothing it again by coating with a lacquer (for example epoxide resin diluted with acetone). The wave length of the corrugations is 1/10 to 1/2 of the frame thickness while being 5-50 times greater than the wave length of the yellow helium line. The height of the corrugations is between 1/10 and 1/4 of their wave length.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE876861X | 1957-06-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB876861A true GB876861A (en) | 1961-09-06 |
Family
ID=6817847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18044/58A Expired GB876861A (en) | 1957-06-06 | 1958-06-05 | Improvements in and relating to view finders |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB876861A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2188924A (en) * | 1986-04-08 | 1987-10-14 | Glaverbel | Matted glass, process of producing matted glass, photo-voltaic cell incorporating a glass sheet, and process of manufacturing such a cell |
GB2188925A (en) * | 1986-04-08 | 1987-10-14 | Glaverbel | Matted glass and process of manufacturing same |
GB2244146A (en) * | 1990-04-12 | 1991-11-20 | Asahi Optical Co Ltd | Viewfinder |
-
1958
- 1958-06-05 GB GB18044/58A patent/GB876861A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2188924A (en) * | 1986-04-08 | 1987-10-14 | Glaverbel | Matted glass, process of producing matted glass, photo-voltaic cell incorporating a glass sheet, and process of manufacturing such a cell |
GB2188925A (en) * | 1986-04-08 | 1987-10-14 | Glaverbel | Matted glass and process of manufacturing same |
US4880677A (en) * | 1986-04-08 | 1989-11-14 | Glaverbel | Matted glass |
US4882214A (en) * | 1986-04-08 | 1989-11-21 | Glaverbel | Matted glass |
GB2188924B (en) * | 1986-04-08 | 1990-05-09 | Glaverbel | Matted glass, process of producing matted glass, photo-voltaic cell incorporating a glass sheet, and process of manufacturing such a cell |
GB2188925B (en) * | 1986-04-08 | 1990-05-09 | Glaverbel | Matted glass and process of manufacturing same |
GB2244146A (en) * | 1990-04-12 | 1991-11-20 | Asahi Optical Co Ltd | Viewfinder |
US5218393A (en) * | 1990-04-12 | 1993-06-08 | Asahi Kogaku Kogyo Kabushiki Kaisha | Viewfinder with field of view indicating frame |
GB2244146B (en) * | 1990-04-12 | 1994-05-18 | Asahi Optical Co Ltd | Viewfinder |
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