Adhesive bonding and miscellaneous chemical manufacture – Differential fluid etching apparatus – With measuring – sensing – detection or process control means
Reexamination Certificate
2007-05-08
2007-05-08
Lebentritt, Michael (Department: 2812)
Adhesive bonding and miscellaneous chemical manufacture
Differential fluid etching apparatus
With measuring, sensing, detection or process control means
C156S345240, C118S712000, C438S014000, C700S121000, C257SE21521
Reexamination Certificate
active
10493138
ABSTRACT:
A wall film monitoring system includes first and second microwave mirrors in a plasma processing chamber each having a concave surface. The concave surface of the second mirror is oriented opposite the concave surface of the first mirror. A power source is coupled to the first mirror and configured to produce a microwave signal. A detector is coupled to at least one of the first mirror and the second mirror and configured to measure a vacuum resonance voltage of the microwave signal. A control system is connected to the detector that compares a first measured voltage and a second measured voltage and determines whether the second voltage exceeds a threshold value. A method of monitoring wall film in a plasma chamber includes loading a wafer in the chamber, setting a frequency of a microwave signal output to a resonance frequency, and measuring a first vacuum resonance voltage of the microwave signal. The method includes processing the wafer, measuring a second vacuum resonance voltage of the microwave signal, and determining whether the second measured voltage exceeds a threshold value using the first measured voltage as a reference value.
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Parsons Richard
Strang Eric J.
Lebentritt Michael
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Pompey Ron
Tokyo Electron Limited
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