Electronic endoscope provided with a sample-hold circuit
US5016975A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1989 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Jun 8, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V14/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic endoscope having a light emitting unit for emitting illuminating light from the tip of the insertable part, a solid state imaging device at the tip for receiving an illuminated light image, a sample-holding circuit for sample-holding an output signal from the solid state imaging device, a light source for such light emitting unit and an iris device in such light source, the iris device comprising a diaphragm device for preventing the spectral characteristics of the endoscope from being changed due to the amount of light reduction which consists of a diaphragm assembly consisting of two dimensionally diaphragm units which consists of light passing openings with small sectional area and light shading parts formed by tubular surfaces surrounding the side surfaces of the openings, positioned in the beam emitted from illuminating lamp, and provided with means for turning diaphragm assembly from a position where the tubular surfaces are in parallel with the axis of the illumination beam to a position where the axes are at an angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.