Patent ID: 6511932
Filing Date: 2003-01-28
Classification: C03C,G02B

Abstract:
A graded index lens having a radial refractive index gradient obtained by treating a raw glass material having a rod shape by ion exchange using silver to form a refractive index distribution in the radial direction of the rod, wherein the raw glass material comprises a glass composition of the following components:152O&lE;30 mol %; 102O3&lE;25 mol %; 27.5&lE;SiO2&lE;55 mol %; 3&lE;B2O3&lE;18 mol %; 2.5&lE;MgO&lE;18 mol %; 0&lE;Ta2O5&lE;5 mol %; 0&lE;La2O3&lE;3 mol %; 0&lE;BaO&lE;3 mol %; and Q&lE;ZrO2&lE;3 mol %.