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:
Mar. 05, 2013
Filed:
Sep. 14, 2009
Noriyuki Kawano, Tokyo, JP;
Jiro Yoshinari, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
Atsuko Kosuda, Tokyo, JP;
Naoki Hayashida, Tokyo, JP;
Noriyuki Kawano, Tokyo, JP;
Jiro Yoshinari, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
Atsuko Kosuda, Tokyo, JP;
Naoki Hayashida, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A recording and reading system for a multi-layered optical recording medium includes: a multi-layered optical recording medium including a plurality of recording layers and a single servo layer; and an optical head. The optical head includes a recording and reading objective lens of a signal recording and reading optical system and a servo objective lens of a servo signal detection optical system that are disposed on a common actuator. The recording and reading objective lens is mounted on the common actuator through a minute-drive apparatus so as to be minutely driven in a focusing direction relative to the servo objective lens. When the servo objective lens is focused on the servo layer, a reading light beam is quickly focused on a target one of the plurality of recording layers.