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Imaging system having vari-focal lens for use in endoscope

  • US 4,488,039 A
  • Filed: 09/03/1982
  • Issued: 12/11/1984
  • Est. Priority Date: 09/12/1981
  • Status: Expired due to Fees
First Claim
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1. An imaging system for use in an endoscope comprising:

  • a vari-focal lens system provided in a viewing head to be inserted into a cavity;

    a solid-state imaging device for picking up an image formed by said lens system to produce electrical signals representative of the image;

    supporting means for supporting said lens system and imaging device thereon so as to change the spacing between said lens system and said imaging device on the optical axis of said lens system; and

    controller means operable in response to magnification of said lens system for estimating the position of a focus of said lens system to control said supporting means so as to position said imaging device substantially at the focus of said lens system.

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