Exposure time control device for an electric shutter in a single reflex camera with through the lens measuring system
US4040068A · kind A · utility
1Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Jun 13, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/09976
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A control device for controlling the exposure time automatically for an electric shutter, in a single reflex camera of the so-called "through the lens" photometric type which determines the brightness of an object by means of the light past through the projection lens of a camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.