Multi-frequency screen
US4083632A · kind A · utility
6Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1976 |
| Grant date | Apr 11, 1978 |
| Priority date | — |
| Expiry date | Apr 5, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/04027
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A half-tone screen in which a substantially transparent substrate has a plurality of opaque regions disposed thereon. The opaque regions are arranged in at least a high frequency repetitive pattern and a low frequency repetitive pattern. This type of screen may be employed to modulate the light image of a color transparency being reproduced by an electrophotographic printing machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.