Automatic focusing device wherein loop gain is set responsively to variation of magnification
US5140357A · kind A · utility
18Cited by
1References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1990 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Dec 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/282
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focus adjusting device comprising extracting circuitry for extracting a focus signal from an image sensor corresponding to the degree of focusing of an image sensing signal output from the sensor, a drive device for adjusting focus so as to bring an optical system into a focuses state on the basis of the focus signal and a control unit operative to detect a magnification varying operation of the optical system for controlling a loop gain of a closed loop encompassing the image sensor, the extracting circuitry and the drive device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.