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:
May. 02, 2006
Filed:
Oct. 03, 2002
Hidemi Takahashi, Ibaraki, JP;
Hidemi Takahashi, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
It is a subject to provide an optical disc device which can speedily control generation of a data sync clock, when the position of data reading by an optical pickup shifts between a data unrecorded area and a data recorded area. An optical disc device comprises a first wobble cycle counterfor counting the cycle of a wobble reference signal Sthat is synchronized with a wobble signal Sobtained from an optical disc, with a constant cycle clock S; a second wobble cycle counterfor counting the cycle of the wobble reference signal Swith a data sync clock S; a count value comparatorfor obtaining a difference between a count value outputted from the first wobble cycle counterand a count value outputted from the second wobble cycle counter; and a comparison result judgement unitfor judging whether or not the value of a count value comparison result that is output from the count value comparatoris within a range of preset values. Therefore, when a position where information is read by an optical pickup shifts between a data unrecorded area and a data recorded data, generation of the data sync clock can be speedily controlled.