Automatic focusing apparatus for a camera
US4405220A · kind A · utility
4Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1981 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Oct 29, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focusing apparatus for a camera includes object brightness detecting means for detecting the brightness of an object and producing an output corresponding to the brightness, in-focus detecting means for detecting whether the phototaking lens of the camera lies within or outside a predetermined in-focus range near the in-focus point and producing outputs corresponding to the respective cases, and phototaking lens driving means for driving the phototaking lens to its in-focus position in accordance with the output of the object brightness detecting means and the output of the in-focus detecting means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.