TRANSPARENT POLYCRYSTAL SPINEL SUBSTRATE AND METHOD FOR PRODUCING THE SAME, AND ELECTRO-OPTICAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a transparent polycrystal spinel substrate which suppresses variation in an image, thereby further improving the quality of a display image, to provide a method for producing the same, and to provide an electro-optical device using the transparent polycrystal spinel substrate.

SOLUTION: The transparent polycrystal spinel substrate is provided in which the maximum length of optical defects at the inside is ≤100 μm. Also the transparent polycrystal spinel substrate is provided in which the maximum length of optical defects at the inside is ≤50 μm. The method for producing the transparent polycrystal spinel substrate comprises: a step where raw material powder including impurities in a prescribed amount or below is classified; a molded body production step where the classified raw material is molded into prescribed dimensions; a primary sintering step where the molded body is sintered to form a primarily sintered compact; and a secondary sintering step where the primarily sintered compact is pressure-sintered at 1,600 to 1,800°C to form a secondarily sintered compact.

COPYRIGHT: (C)2010,JPO&INPIT