Objective of endoscope

Objective of endoscope

  • CN 1,265,745 A
  • Filed: 07/30/1998
  • Published: 09/06/2000
  • Est. Priority Date: 08/01/1997
  • Status: Abandoned Application
First Claim
Patent Images

1. one kind is used for objective of endoscope, comprises by the order from object side:

  • the 1st lenticular unit with zero refractive index;

    One has the 2nd lenticular unit as side surface that protrudes towards the picture side;

    And the 3rd lenticular unit, wherein the 3rd lenticular unit meet the following conditions (1) with object side surface of protruding towards object side;

    (1) 3<

    r 3F/D 3

    10 Reference symbol r in the formula 3FRepresent radius-of-curvature on the object side surface of the 3rd lenticular unit and reference character D 3Represent the thickness of the 3rd lenticular unit.

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