Image pick-up apparatus
US4959727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1989 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | Jun 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/72
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video camera comprises an image sensor for converting a projected light image into an electrical signal, an exposure time setting circuit for setting the exposure time for the image sensor to either one of a normal exposure time and an exposure time longer than the normal exposure time, and an automatic gain control circuit including a variable gain amplifier for amplifying a video signal read out from the image sensor and a detector for detecting an output signal level of the variable gain amplifier and supplying a gain control signal based on the result of detection to the variable gain amplifier. The automatic gain control circuit is controlled so as to make the response speed of the automatic gain control circuit, when the exposure time is set to an exposure time longer than the normal exposure time, lower than that preset when the exposure time is set to the normal exposure time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.