Patent ID: 6745901
Filing Date: 2004-06-08
Classification: H01L,Y10S

Abstract:
A wafer cassette equipped with piezoelectric sensors comprising:a cassette body having a top wall, a bottom wall, a rear wall and two sidewalls forming an open-front enclosure and defining a cavity therein, a left sidewall and a right sidewall each having a corrugated interior surface, a first plurality of ridge-shaped dividers forming said corrugated interior surface in said left sidewall each having a base portion integral with the sidewall and a tip portion extending outwardly from said sidewall toward said cavity in said body, said ridge-shaped dividers being oriented parallel to said bottom wall and perpendicular to said front opening defining slot-shaped receptacles therein between, a second plurality of ridge-shaped dividers forming said corrugated interior surface in said right sidewall each having a base portion integral with the sidewall and a tip portion extending outwardly from said sidewall toward said cavity in said body, said ridge-shaped dividers being oriented parallel to said bottom wall and perpendicular to said front opening defining slot-shaped receptacles therein between, and each of said first and second plurality of ridge-shaped dividers having a top surface and embedded in said top surface at least one piezoelectric sensor for sensing the presence or absence of a single water positioned on said top surface.