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:
Aug. 18, 2015
Filed:
Jul. 30, 2014
Shin-etsu Handotai Co., Ltd., Tokyo, JP;
Daisuke Furukawa, Suzaka, JP;
Kazumasa Asai, Nagano, JP;
Takahiro Kida, Chikuma, JP;
Tadao Tanaka, Iiyama, JP;
SHIN-ETSU HANDOTAI CO., LTD., Tokyo, JP;
Abstract
A wafer polishing apparatus configured to polish simultaneously both surfaces of a wafer by pressing and rubbing the wafer, while holding the wafer with: a lower turn table having a flat polishing-upper-surface rotationally driven; an upper turn table having a flat polishing-lower-surface rotationally driven, the upper turn table being arranged with facing to the lower turn table; and a carrier having a wafer-holding hole for holding the wafer, wherein the polishing is performed while measuring a thickness of the wafer through a plurality of openings provided between a rotation center and an edge of the upper turn table or the lower turn table, and switching a polishing slurry with a polishing slurry having a different polishing rate during the polishing of the wafer. As a result, the wafer polishing apparatus can manufacture a wafer having a high flatness and a high smoothness at high productivity and high yield.