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

  • US 4,928,172 A
  • Filed: 09/15/1988
  • Issued: 05/22/1990
  • Est. Priority Date: 01/07/1988
  • Status: Expired due to Term
First Claim
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1. An endoscope output signal control device comprising:

  • light quantity varying means for varying a quantity of light incident to an imaging means for forming an endoscopic image;

    light quantity setting means for variably setting the quantity of incident light by driving said light quantity varying means;

    automatic gain control means for conducting control to maintain a signal from said imaging means substantially at a constant level; and

    automatic gain control eliminating means for eliminating, at least when a level of the signal from said imaging means is within range controllable by said light quantity varying means, any influence of said automatic gain control means on a change in the level of said signal caused by a change in a level of light quantity set by said light quantity setting means.

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