Endoscope using solid state image pick-up device
First Claim
1. An endoscope with a solid state image pick-up for receiving an image from a subject to be examined, comprising:
- an illuminating means for projecting light onto the subject;
a first level detecting means for detecting a level of a video signal supplied from the solid state image pick-up device;
a first level comparing means connected to said first level detecting means for comparing the level of the signal detected by said first level detecting means with a preset first reference level and generating a first control signal in accordance with the level difference;
a light controlling means connected to the output of said first level comparing means for controlling the amount of light emitted from said illuminating means based on said first control signal;
a gain-variable amplifying means for receiving and amplifying the video signal from the solid state image pick-up device;
a second level detecting means connected to said gain-variable amplifying means for detecting the level of the signal therefrom; and
a circuit means connected to said second level detecting means for comparing the level of the signal detected by said second level detecting means with a preset second reference level and generating a second control signal in accordance with the level difference therebetween and providing said second control signal as a gain controlling signal to said gain-variable amplifying means.
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Accused Products
Abstract
An endoscope is disclosed having a solid state image pick-up for receiving an image from a subject to be examined. The endoscope includes an illuminating source for projecting light onto the subject, a first level detector for detecting a level of a video signal supplied from the solid state image pick-up device, a first level comparator connected to the first level detector for comparing the level of the signal detected by the first level detector with a preset first reference level and generating a first control signal in accordance with the level difference, and a light controller connected to the output of the first level comparator for controlling the amount of light emitted from the illuminating source based on the first control signal. The endoscope also includes a gain-variable amplifier for receiving and amplifying the video signal from the solid state image pick-up device, a second level detector connected to the gain-variable amplifier for detecting the level of the signal therefrom, and a circuit connected to the second level detector for comparing the level of the signal detected by the second level detector with a preset second reference level and generating a second control signal in accordance with the level difference therebetween and providing the second control signal as a gain controlling signal to the gain-variable amplifier.
76 Citations
7 Claims
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1. An endoscope with a solid state image pick-up for receiving an image from a subject to be examined, comprising:
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an illuminating means for projecting light onto the subject; a first level detecting means for detecting a level of a video signal supplied from the solid state image pick-up device; a first level comparing means connected to said first level detecting means for comparing the level of the signal detected by said first level detecting means with a preset first reference level and generating a first control signal in accordance with the level difference; a light controlling means connected to the output of said first level comparing means for controlling the amount of light emitted from said illuminating means based on said first control signal; a gain-variable amplifying means for receiving and amplifying the video signal from the solid state image pick-up device; a second level detecting means connected to said gain-variable amplifying means for detecting the level of the signal therefrom; and a circuit means connected to said second level detecting means for comparing the level of the signal detected by said second level detecting means with a preset second reference level and generating a second control signal in accordance with the level difference therebetween and providing said second control signal as a gain controlling signal to said gain-variable amplifying means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification