Endoscope output signal control device and endoscope apparatus making use of the same

摘要

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 means.