Apparatus for delivering distance information of camera
US4743931A · kind A · utility
23Cited by
7References
54Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1986 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Nov 25, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus for delivering distance information of a camera includes counter means which counts a relative distance corresponding to a movement of a taking lens. The counter means is reset when the taking lens reaches a reference position located at infinity. Using stored data (absolute distance factors) which is specific to a taking lens and the count in the counter means, an absolute distance is derived.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.