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. 21, 2009
Filed:
Mar. 22, 2006
Yukio Kaneko, Tokyo, JP;
Yoshimi Yodokawa, Tokyo, JP;
Takeshi Umega, Tokyo, JP;
Mamoru Usami, Tokyo, JP;
Tsuyoshi Komaki, Tokyo, JP;
Yukio Kaneko, Tokyo, JP;
Yoshimi Yodokawa, Tokyo, JP;
Takeshi Umega, Tokyo, JP;
Mamoru Usami, Tokyo, JP;
Tsuyoshi Komaki, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention makes it possible to strip off a stamper stuck on a resin layer for groove formation during the manufacture of an optical disc from the resin layer without imparting damage or the like to the stamper. The present invention achieves this object by having the steps of bringing about a state in which the stamper protrudes from a substrate by a predetermined width, rotating the substrate with the back surface of the disc-shaped substrate attracted and held, elevating rollers capable of rolling relative to a contacting surface contacting with the protruding portion simultaneously with the rotation, and continuously applying a force working in a direction to separate the protruding portion from the substrate in the circumferential direction of the stamper.