Electronic endoscope apparatus driving light shielding plate
US6540671B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2002 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Sep 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/555
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided a light shielding plate to shield light from a light source lamp, and this light shielding plate is rotated and driven by a light shielding plate drive circuit, and a charge stored in a CCD for a period of, for example, 20H at a start of an effective period J of a vertical scanning period, is discharged and this is set as a non-operating period and a drive control over the light shielding plate for a period of 40.5H which is a sum of this non-operating period and a blanking period B (20.5H) is performed. This provides an adequate margin of time for controlling the light shielding plate at starting and stopping times and makes the drive control easier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.