The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1995
Filed:
Oct. 14, 1993
Mitsuaki Minato, Kanagawa, JP;
Atsushi Matsushita, Kanagawa, JP;
Shinichi Omori, Kanagawa, JP;
Jun Kanamori, Tokyo, JP;
Tokyo Ohka Kogyo Co., Ltd., Kanagawa, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A plasma processing apparatus for processing a workpiece such as a semiconductor wafer in a plasma includes a downstream- or coaxial-type chamber for housing the workpiece. A first sheet-like electrode is mounted on an outer circumferential surface of the chamber and electrically connected to a high-frequency power supply, and a second sheet-like electrode is mounted on the outer circumferential surface of the chamber and connected to ground. The first and second sheet-like electrodes are spaced in confronting relationship from each other circumferentially of the chamber across or along the axis thereof. The first and second sheet-like electrodes have respective axial or circumferential arrays of successive teeth, such as rectangular comb teeth, extending circumferentially or axially of the chamber and respective axial or circumferential arrays of successive recesses which complementarily receive the teeth, respectively, in an interdigitating pattern. The teeth have respective edges spaced from the corresponding edges of the recesses by a substantially uniform gap.