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Automatic dimmer for endoscope

  • US 4,622,584 A
  • Filed: 09/05/1984
  • Issued: 11/11/1986
  • Est. Priority Date: 09/05/1983
  • Status: Expired due to Term
First Claim
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1. Automatic dimmer for an endoscope characterized in that it has a long and narrow inserting member having an inserting end at one end and a viewing end at the opposite end, image forming lens system at the inserting end for forming the image of a subject, solid pickup element whose image pickup face is provided at the focal point of the said image forming lens system in said inserting end, a video prooessor at said viewing end of said inserting member for receiving signals corresponding to the picture elements output from said solid pickup element and for outputting said signals as color signals, display equipment for displaying a color picture with said color signals output from said video processor, illuminating means at said inserting end of said inserting member for illuminating within the image forming range of said lens system, said illuminating means including a light distributing lens at the inserting end of said inserting member, a light source for said illuminating means, a light distributing lens, means responsive to applied electric signals for regulating the quantity of light transmitted from said light source to said light distributing lens, dimmer signal generating means responsive to said color signals from said video processor and for forming dimmer signals, and driving circuit means for outputting an electrical signal and for changing the quantity of light from said light source to said illuminating means in accordance with the level of the signal applied.

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