Photoplotter
US4500182A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1982 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/225
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A photoplotter wherein a relative movement is produced between a photosensitive media and a radiant energy pattern generated on the media. The relative movement is in accordance with a desired exposure trace on the media. A difference between actual and desired relative movement is detected and the radiant energy pattern is varied to compensate for that difference. In a preferred embodiment, the radiant energy pattern is established by a pattern generator which displays an alterable pattern object on its face the position of the pattern object on the face being variable to compensate for the difference between actual and desired relative movement. The pattern object may be generated as a linear trace on a cathode ray tube (CRT) with the number of linear traces generated per unit of time being dependent on the relative movement velocity. The pattern images on the media resulting from the linear CRT traces or pattern objects overlap to provide a continuous exposure pattern along the desired exposure trace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.