Method of manufacturing a glass body having a non-uniform refractive index

  • US 5,049,175 A
  • Filed: 04/19/1988
  • Issued: 09/17/1991
  • Est. Priority Date: 11/02/1982
  • Status: Expired due to Fees
First Claim
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1. A method for manufacturing an elongate light transmissive optical glass body having a central axis and a cylindrical circumference, said elongate body having a non-uniform refractive index which decreases radially between said axis and said circumference, said method comprising the following steps:

  • storing grains of at least two substances which yield glass having different refractive indices, in a respective at least two hoppers, said grains having diameters in the range of 0.01 μ

    m to 1 mm,mixing said grains in a desired proportion which will provide said non-uniform refractive index by controlled feeding into a common feed line having a pouring spout for pouring the mixed grains therefrom,pouring said grains onto a support while rotating said support about a vertical axis of rotation,moving said pouring spout radially between said vertical axis and means defining a circumference at a fixed radius from said axis while rotating said support,moving said pouring spout vertically relative to said support while rotating said support,pouring said grains from said spout during at least one of moving said spout radially and moving said spout vertically, thereby forming a cylindrical granular body having an axis coincident with said axis of rotation, andheat fusing the granular body to form said light transmissive cylindrical glass body.

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