Device for continuously varying the shutter speed of a video tape camera
US4545659A · kind A · utility
6Cited by
9References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Dec 16, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval. The phase relationship or relative angular positions of the disks can be continuously varied, while the disks are rotating in use, to vary the shutter speed or exposure time. Mechanisms for continuously varying the angular positions of the disks include mechanical linkages and hydraulic systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.