Reflex mirror for single lens reflex camera
US4081807A · kind A · utility
12Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1977 |
| Grant date | Mar 28, 1978 |
| Priority date | — |
| Expiry date | Jan 13, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B19/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A reflex mirror 2, 2' for an SLR camera includes a fully reflective, elliptical area 2a, 2a' whose center coincides with the optical axis, and a surrounding, elliptical, semi-transparent area 2b, 2b'. The remaining area 2c, 2c' of the mirror is fully reflective. The semi-transparent area may be uniform in transmissivity, or it may be formed by a plurality of concentric elliptical slits in the reflective surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.