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:
May. 06, 2008
Filed:
Jan. 17, 2003
Mamoru Usami, Tokyo, JP;
Tomoki Ushida, Tokyo, JP;
Kenji Yamaga, Tokyo, JP;
Yoshimi Sakai, Tokyo, JP;
Mamoru Usami, Tokyo, JP;
Tomoki Ushida, Tokyo, JP;
Kenji Yamaga, Tokyo, JP;
Yoshimi Sakai, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A disc-shaped optical recording medium formed by carrying out a film formation process on a disc-shaped substrate material and completed by forming a center hole at the last step is manufactured in a manner such that no eccentricity will occur when the recording medium is loaded onto a drive. At the last step of an optical disc manufacturing process, i.e., at the time of opening a hole in the center partof the disc-shaped substrate materialformed with at least a resin layer on one side thereof, the center partis removed in a manner such that the diameter of the chucking center holeis larger on the disc-shaped substrate materialside than on the light transmitting resin layerside of the disc-shaped optical recording medium, thereby manufacturing the disc-shaped optical recording medium