Patent ID: 6166646
Filing Date: 2000-12-26
Classification: H01L,Y10T

Abstract:
A vacuum adsorbing apparatus of a semiconductor device fabrication facility, comprising:a vacuum line;a mounting plate to which an object is to be mounted, s aid mounting plate being connected to said vacuum line so as to produce a pressure corresponding to that existing in said vacuum line to adhere the object thereto;a digital vacuum sensor mounted in said vacuum line that senses the pressure existing in said vacuum line;a standard voltage supply that outputs a standard voltage; anda comparator, operatively coupled to said digital vacuum sensor and to said standard voltage supply, that compares a signal output by said digital vacuum sensor that is indicative of the pressure existing in said vacuum line and the standard voltage, and that outputs a signal indicative of whether a vacuum sufficient to adhere the object to said mounting plate exists in said vacuum line, based on the comparison.