Importance

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Abstract

A system for managing production of glass substrates includes a first inspection device that calculates a lot average defect density based on defect data from an inspection of ten or more multi-sheet production glass substrates sampled from one lot, and a preliminary calculation device that preliminarily calculates a profit of an operator in an upstream-side step and a loss of an operator in a downstream-side step over a plurality of times while differing the number of defective virtual individual surfaces, and calculates an allowable number of the defective virtual individual surfaces based on results of the preliminary calculations when the profit is larger than the loss. The system also includes a second inspection device that calculates all the multi-sheet production glass substrates of the one lot to count the defective virtual individual surfaces, and a defect determination that determines whether the multi-sheet production glass substrate is non-defective or defective.

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First Claim