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:
Jan. 29, 2002
Filed:
Sep. 26, 2000
Hitoshi Ohmori, Wako, JP;
Muneaki Asami, Tokyo, JP;
Akihiko Uzawa, Kanagawa, JP;
Sadamasa Shigitani, Hukuyama, JP;
Other;
Abstract
A method for glass substrate chamfering using a metal-bonded outer-surface grindstone for simultaneously processing the end surface and the oblique surfaces of the outer periphery of a doughnut-like glass substrate with a circular hole at the center thereof, and a metal-bonded inner-surface grindstone for simultaneously processing the end surface and the oblique surfaces of the inner periphery are provided; the outer-surface grindstone and the inner-surface grindstone simultaneously grind end surfaces and oblique surfaces of the outer and inner peripheries of the glass substrate, and during grinding, the outer-surface grindstone is sharpened by dressing it electrolytically, and the inner-surface grindstone is sharpened by an electrolytic dressing when not processing as the glass substrate is being replaced. Thus, edge portions of the glass substrate for a hard disk can be processed accurately, efficiently, and with high quality, and the need for a subsequent process, such as buff-polishing, is reduced or even eliminated.