Focus detecting device and image signal amplifier circuit therefor
US4763154A · kind A · utility
16Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1986 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Dec 24, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image signal amplifier circuit includes an amplifier for amplifying an image signal from a focusdetecting self-scanned image sensor, and a monitor photodetector for detecting the brightness of an object to be photographed. The amplification degree of the image signal is controlled by an automatic gain controller in the amplifier based on an output signal from the monitor photodetector so that the image signal as amplified will be of a constant level. An offset voltage is added to an output signal from the amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.