Color image pickup device
US4527189A · kind A · utility
14Cited by
3References
7Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Feb 18, 1983 |
| Grant date | Jul 2, 1985 |
| Priority date | — |
| Expiry date | Feb 18, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides a color image pickup device in which image light from a white object to be photographed or image light integrated by a diffusion plate or the like is incident on a pickup tube through an electrochromic element. Two primary color signals are separated from a video signal from the pickup tube, a voltage corresponding to a difference between the two primary color signals is detected by a differential amplifier, and the voltage is then applied across an electrochromic element. A spectral transmittance of which is then controlled, thereby achieving an optimal white balance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.