Patent ID: 6618639
Filing Date: 2003-09-09
Classification: G05B,H01L,Y02P

Abstract:
A process for monitoring dust, wherein the process comprises the steps of:(a) preliminarily storing carrying patterns of wafers used for monitoring dust in a clean room on a lot by lot basis in a storage unit of a carrying host computer for controlling a carrying control system; (b) automatically carrying and placing said wafers used for monitoring dust to and in a stocker on a carrying path by carrying said wafers on a lot by lot basis on and along at least part of a carrying path for product wafers in accordance with a carrying pattern stored in said storage unit; (c) determining a stocker to which a lot or lots of said wafers used for monitoring dust are to be carried with reference to said carrying pattern based upon a carrying completion report which is informed to said carrying host computer from said stoker; (d) sending out said wafers used for monitoring dust from the stocker which stores said wafers for carrying them to a next stocker; and (e) recovering said wafers used for monitoring dust when automatic carrying of said wafers used for monitoring dust on the carrying path which is defined by said carrying pattern is completed, followed by measuring dust on the wafers.