Endoscope apparatus for obtaining properly dimmed observation images
US7573499B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2004 |
| Grant date | Aug 11, 2009 |
| Priority date | — |
| Expiry date | Dec 26, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/555
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A CCD driver circuit adjusts and supplies pulse-type signals to a CCD in order to adjust the sensitivity of the CCD. A metering circuit meters a signal output from the CCD. A sensitivity control circuit controls the sensitivity of the CCD by controlling the sensitivity multiplication factor of the CCD based on a metering result by the metering circuit. A metering correcting circuit corrects a metering result from the metering circuit based on a charge multiplication factor from the sensitivity control circuit. An aperture control circuit controls an aperture based on a metering signal corrected by the metering correcting circuit. Thus, an image of an object of which strength of light largely varies can be obtained as an image under a proper dimming state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.