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. 28, 2010
Filed:
Apr. 06, 2006
Naoharu Yanagawa, Saitama, JP;
Masufumi Asada, Saitama, JP;
Kunihiko Horikawa, Saitama, JP;
Akira Shirota, Saitama, JP;
Naoharu Yanagawa, Saitama, JP;
Masufumi Asada, Saitama, JP;
Kunihiko Horikawa, Saitama, JP;
Akira Shirota, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A recording device (T or the like) is provided with (i) recording elements () for recording data by irradiating a recording medium with laser beams; (ii) driving members (T,F,T,F,) for performing tracking process or focusing process; (iii) a servo elements (T,F) for automatically controlling the driving members based on an error signal; (iv) specifying elements () for specifying an area where a recording medium characteristic (core eccentricity or the like) is not good, based on a high frequency component included in the error signal; and (v) a control unit () for (v-i) controlling the servo unit to change the gain in the automatic control, and for (v-ii) controlling the recording elements to change the recording power of the laser beams, in the specified area.