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:
Dec. 18, 2012
Filed:
Jul. 11, 2011
Manabu Shiozawa, Yokohama, JP;
Takakiyo Yasukawa, Fujisawa, JP;
Manabu Shiozawa, Yokohama, JP;
Takakiyo Yasukawa, Fujisawa, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Hitachi Consumer Electronics Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a multilayer optical disc and an optical disc drive which can identify recording layers without performing tracking servo control or changing the structure of the disc. In a multilayer optical disc, the recording layer includes a layer identification regionhaving a recording pattern for layer identification, the layer identification regionincluding a layer specific regionhaving a specific pattern and a common regionhaving a common pattern different from the specific pattern, the layer specific regionbeing provided at a different radial position in each of the recording layers. The optical disc drive detects the layer specific regionhaving the specific pattern from the layer identification regionof the multilayer optical disc, and identifies the current layer based on the radial position of the layer specific region.