Focus detecting apparatus
US4812869A · kind A · utility
29Cited by
9References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Jul 7, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
First and second light distributions having their relative positional relation varying in conformity with the focus adjusted state of an objective optical system and based on an object are received by a plurality of picture elements, and the range of use of the picture element row can be changed when a value indicative of the focus adjusted state is calculated by the use of the signals from the picture elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.