Patent ID: 6972422

Claim:
A method for measuring particles in a glass substrate, comprising the steps of: (a) sequentially conveying a plurality of glass substrates; (b) scanning with a camera a unit area of a glass substrate in a direction of a travel path of the glass substrate and storing particle information thereof, wherein the camera is placed above a travel path of the glass substrates and a scan width thereof is preset; (c) shifting the camera in a direction perpendicular to the travel path of the glass substrate to a position corresponding to a next unit area for a succeeding glass substrate; (d) storing information on the particles in the unit area of the succeeding glass substrate obtained by scanning the glass substrate using the shifted camera; (e) estimating whether a sum of the respective scanned unit areas is within an allowed limit of an area of a glass substrate; and (f) returning to step (c) if an answer from step (e) is “No” or storing information on the particles in the entire glass substrate obtained by summing up the information on the particles in the respective scanned unit areas if the answer is “Yes”.