Filter changing mechanism for a video camera
US5070407A · kind A · utility
Inventors
Key dates
| Filing date | May 11, 1990 |
| Grant date | Dec 3, 1991 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/55
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a video camera using a silicon diode tube or a similar acting light sensitive solid state pickup element as a light image sensing device, a light control device which detects light in the visual spectrum and upon receipt of visual spectrum light operates a mechanical switching device which positions a Cut I-R filter in front of the image sensing device for visual light illuminated objects and positions a optical or neutral density filter in front of the image sensing device in the absences of any visual light for detection of infra-red light illuminated objects. Different filters can be substituted for other illuminating light frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.