SHAPE MEASURING DEVICE, SHAPE MEASURING METHOD, AND GLASS PLATE MANUFACTURING METHOD

摘要

A simple construction is allowed to achieve accurate measurement of the surface shape of a transparent flat plate. A shape measuring apparatus includes: an image pick-up section 2 that is arranged such that an optical axis becomes perpendicular to a direction of extending of a linear pattern X arranged above a transparent flat plate 3 serving as a measurement object and that captures an image of two reflection spot groups of the pattern X reflected in a first surface M1 and a second surface M2 of the transparent flat plate 3 and generates an image containing two reflection images separated in a direction perpendicular to the direction of extending; a first surface reflection spot group estimating section that estimates from the image a first surface reflection spot group A of the pattern X generated by the first surface M1 of the transparent flat plate 3 by using a positional relation of the transparent flat plate 3, the pattern X, and the image pick-up section 2; an inclination angle calculating section that calculates an inclination angle of the first surface M1 of the transparent flat plate 3 at an estimated position of the first surface reflection spot group A by using the positional relation of the transparent flat plate 3, the pattern X, and the image pick-up section 2; and a surface shape determining section that determines a shape of the first surface M1 of the transparent flat plate 3 based on the calculated inclination angle.