Endoscope output signal control device and endoscope apparatus making use of the same
US4928172A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1988 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Sep 15, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/555
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An endoscope using a solid state imaging device characterized by comprising a solid state imaging device capable of imaging an object image, a light emitting means giving an illuminating light to said object, a first level detecting means fed with a video signal from said solid state imaging device and detecting the level of this signal, a first level comparing means comparing the detected level of this detecting means and a preset first reference level with each other and outputting a first control signal corresponding to the level difference, a light adjusting means fed with this first control signal and adjusting the illuminating light from said light emitting means on the basis of this signal, a gain variable amplifying means taking in the video signal from the detecting end in said first level detecting means and amplifying it, a second level detecting means detecting the level of the signal from this amplifying means and a circuit means comparing the detected level of this detecting means and a preset second reference level with each other, forming a second control signal corresponding to the level difference and making this signal a gain controlling signal to said amplifying…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.