| 摘要 |
PROBLEM TO BE SOLVED: To provide chemically toughened glass which is cuttable and has specified strength. SOLUTION: The chemically toughened glass, having a compressive stress layer formed by ion-exchange in its glass surface layer, has, in the compressive stress layer, two compressive stress patterns, i.e. a compressive stress pattern A at the side near to the glass surface and a compressive stress pattern B at the side near to the glass inner side. The gradient of the stress pattern B differs from that of the stress pattern A, and the stress pattern A is at the lower compressive stress side than a line drawn by extending the stress pattern B to the glass surface. Moreover, the ratio of a surface stress value obtained from the stress pattern A to a virtual surface stress value obtained from a line formed by extending the stress pattern B at the inner layer side of the glass to the glass surface is 0.8-0.95; otherwise, the thickness of the compressive stress layer formed by the stress pattern A is 2-15μm. COPYRIGHT: (C)2005,JPO&NCIPI
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