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Automatic lens meter

  • US 5,231,460 A
  • Filed: 10/04/1991
  • Issued: 07/27/1993
  • Est. Priority Date: 10/16/1990
  • Status: Expired due to Term
First Claim
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1. An automatic lens meter comprising:

  • a projection optical system for projecting at least one light beam onto a lens to be tested, said lens held at a predetermined position in the direction of an optical axis;

    a receiving optical system comprising a light position detector, said receiving optical system receiving light beams related to said at least one light beam and transmitted through the lens to be tested on said light-position detector;

    calculation means for calculating a diopter value and an eccentricity of the lens to be tested from the position of the transmitted light beams on said light-position detector;

    time measuring means for measuring the time during which said eccentricity is within a predetermined range; and

    display means for displaying said diopter value of the lens to be tested when the time during which the eccentricity is within a predetermined range exceeds a predetermined time.

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