Ultrasonic glow discharge surface cleaning

Details Ultrasonic glow discharge surface cleaning Ultrasonic glow discharge surface cleaning

1989-08-03

1991-11-26

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Differential fluid etching apparatus

With microwave gas energizing means

134 1, 156627, 156643, 156646, 2041921, 20429831, B44C 122, B08B 312

Patent

active

050680021

ABSTRACT:
An apparatus is disclosed for abrading contaminants from the surface of a workpiece using plasma glow discharge. The workpieces are positioned in a low pressure chamber with an ionizable gas. A pair of spaced, conductive, interfacing panels form electrodes mounted within the chamber and defining a three-dimensional cleaning space between the electrodes. The electrodes are energized by a power supply, providing an alternative voltage at an ultrasonic frequency and the pressure is maintained to allow only abnormal glow discharge. After initiation of the abnormal glow discharge the electrode current is sensed to detect when to inject additional ionizable gas into the low pressure chamber.

REFERENCES:
patent: 4657616 (1987-04-01), Benzing et al.
patent: 4786352 (1988-11-01), Benzing

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