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. 14, 2011
Filed:
Sep. 28, 2009
Toshiyuki Kashiwagi, Tokyo, JP;
Takeshi Yamasaki, Kanagawa, JP;
Tomomi Yukumoto, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
The present invention relates to an optical disc for use as a recording medium in an optical disc drive, which has a transparent protection film () formed on a recording layer on one plane of the disc substrate () and a printing label filmbeing of approximately the same film quality and film structure as the transparent protection film () formed on the other plane thereof. The printing label film () is a synthetic resin film made mainly of polycarbonate and formed on the disc substrate by screen printing, etc. Thus, the optical disc has the same film quality and film structure on the respective one and the other planes, which prevents occurrence of skew caused by the deformation due to the asymmetry of the structure along the thickness direction of the optical disc. The optical disc has a function to present contents of information recorded therein with the printing label film provided on the other plane of the disc substrate.