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Method of and systems for measuring eccentricity of an aspherical lens surface

  • US 5,844,670 A
  • Filed: 07/29/1996
  • Issued: 12/01/1998
  • Est. Priority Date: 07/28/1995
  • Status: Expired due to Fees
First Claim
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1. A method of measuring eccentricity of an aspherical lens using an image-forming optical subsystem, the aspherical lens having a substantially spherical portion near a paraxial region and an aspherical portion, comprising the steps of:

  • a) placing the aspherical lens in a holder so that a first optical axis near the paraxial region of the aspherical lens is substantially in alignment with a predetermined central axis of the holder, said step a) further comprising;

    1) measuring an amount of misalignment using said first image for correcting the alignment;

    2) moving the aspherical lens according to said measured amount; and

    3) repeating said steps

         1) and

         2) until a predetermined level of said alignment is reached;

    b) forming a first image through the substantially spherical portion using the image-forming optical subsystem whose second optical axis substantially coincides with said first optical axis;

    c) storing a first set of coordinates of a center of said first image formed in said step b);

    d) forming a second image through a predetermined position in the aspherical portion using the image-forming optical subsystem,e) storing a second set of coordinates of a center of said second image formed in said step d); and

    f) determining an amount of eccentricity of the aspherical lens based upon said first set and said second set of said coordinates stored in said steps c) and e).

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