Photoplotter using a light valve device and process for exposing graphics
US4675702A · kind A · utility
24Cited by
7References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1986 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Mar 14, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/70475
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photoplotter supports a sheet of photosensitive material for exposure by an associated light source. A light valve device interposed between the light source and the sheet has a main face parallel to the sheet divided into a plurality of subareas or pixels the light transmissivities of which are individually controlled through an associated computer to cause the exposure to be that of a desired graphic or artwork.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.