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:
Jun. 29, 1999
Filed:
Apr. 16, 1997
Youichi Konno, Saitama-ken, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
An adhered double-sided optical disc is formed by adhering a first disc and a second disc with each other at both sides. The device has a turntable secured to a rotating shaft, a clamper for clamping the double-sided optical disc together with the turntable, and a centering hub mounted on the rotating shaft. The centering hub has a first engaging cylindrical portion and a second engaging cylindrical portion surface of which is located axially inside the first engaging cylindrical portion. Each of both of the engaging cylindrical portions has a diameter so as to be engaged with an inside wall of a center hole of each of the first and second discs. An inclining angle (.alpha.) of the first engaging cylindrical portion with respect to a vertical plane to an axis of the centering hub is larger than an inclining angle (.beta.) of the second engaging cylindrical portion with respect to the vertical plane to the axis.