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EXTENSIBLE-RETRACTABLE HELICALLY COILED FIBER OPTIC ASSEMBLY

  • US 3,817,595 A
  • Filed: 05/15/1972
  • Issued: 06/18/1974
  • Est. Priority Date: 05/06/1970
  • Status: Expired due to Term
First Claim
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1. A method of making an extensible-retractable helically coiled fiber optic assembly, comprising the steps of disposing a bundle of a plurality of flexible optical fibers within a sheath of elastic material having an inner diameter greater than the outer diameter of said bundle of flexible optical fibers so that said plurality of fibers are free to move relative to said sheath, forming the assembled sheath and optical fibers into a helical shape, heating the assembled sheath and optical fibers to a temperature sufficient to set the elastic material and thereafter cooling the elastic sheath and optical fibers at a rate such that the elastic material is set and the optical fibers remain free to move relative to each other and to the elastic sheath, and further including the step of treating said optical fibers anytime prior to the setting of the elastic material to prevent said fibers from sticking together or to the sheath upon heating thereof.

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