×

Illumination and imaging subsystems for a lens inspection system

  • US 5,528,357 A
  • Filed: 02/13/1995
  • Issued: 06/18/1996
  • Est. Priority Date: 12/21/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A lens inspection system for inspecting and detecting optical defects in ophthalmic lenses, comprising:

  • means for holding an ophthalmic lens which lens has a cross-sectional area;

    lighting means for generating colliminated light pulses which colliminated light pulses have a cross-sectional area;

    signal generating means to generate a set of signals representing the intensity of light incident thereon;

    means for directing the light pulses through the lens holding means and onto said signal generating means to produce thereon a light pattern representing the ophthalmic lens held in the holding means wherein the means for directing the light pulses through the lens holding means is able to control the cross-sectional area of the light pulses such that the light pulses illuminate an area about 10% to about 15% larger than the cross-sectional area of the ophthalmic lens; and

    processing means connected to the signal generating means to receive said set of signals therefrom, and to process said signals according to a predetermined program to generate an output signal representing at least one condition of the lens;

    wherein the directing means includesi) a stop axially disposed between the lens holding means and the signal generating means, andii) means for directing portions of the light pulses past the stop and onto the signal generating means to image thereon selected portions of the ophthalmic lens.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×