| 摘要 |
PROBLEM TO BE SOLVED: To provide a method capable of measuring stress of a glass article with high accuracy even in a case of a thin glass article.SOLUTION: A stress measurement method of a transparent article, after making measurement light incident and propagate to a portion to be measured of a tabular transparent article from a first main surface side of the transparent article that has the first main surface and a second main surface formed into a front-to-rear relation, measures stress of the transparent article on the basis of measurement light emitted to the outside of the transparent article. In a state of contacting a solid or liquid medium having a light permeability to the second surface in advance, the stress measurement method makes measurement light incident or propagate.SELECTED DRAWING: Figure 1 |
