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Telecentric lens systems for forming an image of an object composed of pixels

  • US 5,625,495 A
  • Filed: 12/07/1994
  • Issued: 04/29/1997
  • Est. Priority Date: 12/07/1994
  • Status: Expired
First Claim
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1. A telecentric lens system having an aperture stop and a telecentric pupil, said system comprising in order from its long conjugate side to its short conjugate side:

  • (a) a first lens unit which has a negative power and comprises a negative lens element whose strongest surface is convex to the long conjugate side of the system;

    (b) a second lens unit which is of weak optical power and comprises two meniscus elements whose concave surfaces face each other, the system'"'"'s aperture stop being located between the meniscus elements and each meniscus element having at least one aspheric surface; and

    (c) a third lens unit which has a positive power and comprises means for correcting the chromatic aberrations of the system, said third lens unit forming the system'"'"'s telecentric pupil by imaging the aperture stop.

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