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Endoscope having exchangeable objective unit

  • US 5,711,756 A
  • Filed: 05/23/1996
  • Issued: 01/27/1998
  • Est. Priority Date: 05/31/1995
  • Status: Expired due to Fees
First Claim
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1. An endoscope comprising:

  • (a) a body including a hollow insert portion, said insert portion being elongate and having a hard distal end portion, said insert portion and a proximal end portion including a first and a second receiving space formed in the distal end portion thereof, said first and second receiving spaces extending in an axial direction and being partitioned with each other, said first receiving space being open at a distal end face of said insert portion;

    (b) illumination light transmission member whose distal end portion is disposed within said second receiving space and extending backwardly through said insert portion;

    (c) a rigid holder extending in an axial direction through said insert portion and projecting backwardly of the proximal end portion, said holder being slidable in said first receiving space between a forward position where a distal end of said holder is disposed near a distal opening of said first receiving space and a backward position where the distal end of said holder is retracted from the distal opening of said first receiving space;

    (d) light receiving member mounted on the distal end of said holder, and adapted to receive reflected light from an observation object via an objective optical system;

    (e) image transmission member for backwardly transmitting image information received by said light receiving member, said image transmission member being inserted through said insert portion;

    (f) an objective unit including said objective optical system, and a sleeve-like support for receiving and supporting said objective optical system, said objective unit being slidably received within said first receiving space, a rear end of said support of said objective unit being detachably connected to the distal end of said holder; and

    (g) a fixture mechanism for supporting said holder at said backward position, said backward position of said holder is determined such that a distal end of said objective unit connected to said holder being disposed at the distal opening of said first receiving space, thereby said backward position of said holder being determined in accordance with an axial dimension of said objective unit.

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