STRESS MEASUREMENT DEVICE OF REINFORCED GLASS, STRESS MEASUREMENT METHOD OF REINFORCED GLASS, AND REINFORCED GLASS

Japanese Patent JP2022039955

A

To provide a stress measurement device of reinforced glass capable of improving measurement accuracy for stress distribution near the surface of a reinforced glass.SOLUTION: The stress measurement device of reinforced glass comprises: a light source having a function to emit light of a plurality of different wavelengths; an optical conversion member 40 emitting light propagating through a surface layer of a reinforced glass 200 including a compression stress layer outside the reinforced glass 200, and converting two types of light components oscillating in parallel and perpendicular to the surface of the reinforced glass 200 at a critical angle into two types of boundary lines; and an image pick-up device 60. The image pick-up device 60 executes imaging, in a state where the positional relationship among the reinforced glass 200, a light extraction member 30 and the image pick-up device 60 is maintained, and calculates the stress of the reinforced glass from the surface to depth direction on the basis of a position of two types of bright line rows, a position of the two types of bright lines, and/or a position of the two types of boundary lines in the light of a plurality of different wavelengths measured by position determination means.SELECTED DRAWING: Figure 1

ORIHARA HIDEJI
ORIHARA YOSHIO
OGAMI SOJI
ISHIKAWA KAZUYA
OHARA MORITERU

JP2021094722A

March 10, 2022

June 04, 2021

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AGC INC
ORIHARA SEISAKUSHO KK

G01N21/21

Tadashige Ito
Tadahiko Ito

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