Light absorption device for the prevention of stray light in particular in a phototypesetter
US4185902A · kind A · utility
25Cited by
1References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1978 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Jun 2, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A phototypesetter has an optical path including a beam splitter intersecting the main light path and an auxiliary light path for reflecting the auxiliary light path into the main light path. An absorption element with a concave front surface is mounted behind the beam splitter to absorb the non-reflected light from the auxiliary beam. Additionally, the concave surface directs the nonabsorbed light to a light absorbent body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.