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Collimating lens having doublet element between positive-power elements

  • US 5,386,312 A
  • Filed: 08/03/1992
  • Issued: 01/31/1995
  • Est. Priority Date: 08/03/1992
  • Status: Expired due to Term
First Claim
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1. A collimating lens assembly having an optical axis and comprising:

  • a first lens group disposed along said optical axis at a first end of said assembly;

    a second lens group disposed along said optical axis at a second end of said assembly opposite said first end;

    a doublet lens element disposed along said optical axis between said first lens group and said second lens group;

    wherein said first lens group and said second lens group each comprise at least one singlet positive-power optical lens element;

    wherein said doublet lens element includes a first negative-power lens element and a second positive-power lens element, said first lens element having a higher index of refraction than said second lens element for chromatic correction of said collimating lens; and

    wherein said assembly is operative to form a telecentric pupil along said optical axis external to said second end of said assembly.

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