Video camera with automatic focusing function
US5077613A · kind A · utility
12Cited by
10References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Jan 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video camera with an automatic focusing device includes a pre-process unit for eliminating a direct current component from a signal of the video camera and controlling the obtained signal so that the amplitude thereof can be at a constant level, which is disposed at the preceding stage of a signal processing unit for operating the focusing condition of an object from the signal of the video camera. An amplitude of a video signal to be inputted to the signal processing unit can be largely suppressed, thus providing a largely simplified circuit structure of a signal processing unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.