Reseau platen for cameras
US4149788A · kind A · utility
10Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1976 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Nov 1, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A platen for forming reseau marks on a photographic film for a mapping camera or the like which includes a substantially flat platen body provided with a plurality of apertures in each of which is positioned a projector, the apertures being arranged in a pattern corresponding to the pattern of the reseau marks to be formed on the film so that light from a source on one side of the platen is formed into a light beam by the projectors representative of the reseau mark and forms an image on film held by a vacuum against the other side of the platen and which is also exposed to an optical image by the camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.