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Endoscope with a solid-state image pickup device

  • US 5,050,584 A
  • Filed: 07/24/1990
  • Issued: 09/24/1991
  • Est. Priority Date: 09/22/1989
  • Status: Expired due to Term
First Claim
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1. An endoscope having a distal end portion, the distal end portion comprising:

  • an objective lens system comprising a plurality of lenses and having an optical axis and a diameter;

    a supporting frame for supporting the objective lens system;

    a first optical member fixed behind the supporting frame to the objective lens system and having a diameter larger than that of the objective lens system; and

    a solid-state image pickup device fixed behind the first optical member;

    the objective lens system being designed in such a manner that among the effective rays incident on the solid-state image pickup device, the ray imaged at the farthest position from the optical axis of the objective lens system increasingly goes away from the optical axis as the ray approaches the solid-state image pickup device and that the distance between the ray at the image plane of the solid-state image pickup device and the optical axis is larger than the radius of the objective lens system.

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