专利名称：Tilt control apparatus with tilt target value
based on bit error rate signal
发明人：Kouichi Takamine,Yasuaki Edahiro,Hiromichi
Ishibashi,Mitsurou Moriya
申请号：US/018637申请日：19980204公开号：US05886962A公开日：19990323
摘要：The tilt control apparatus of the invention controls to minimize an error in anorthogonal relationship between an optical disk and an optical axis of a light beamirradiated onto the optical disk. The tilt control apparatus includes: an optical pickup forirradiating the light beam onto the optical disk, thereby reproducing informationrecorded on the optical disk; an orthogonality error detector for outputting anorthogonality error signal corresponding to the error in the orthogonal relationshipbetween the optical disk and the optical axis; a tilting mechanism for tilting the opticalaxis; a tilt controller for controlling such that the optical disk falls at right angles with theoptical axis by driving the tilting mechanism in response to the orthogonality error signal;a pulse width variation detector for outputting a pulse width variation signalcorresponding to a variation in a pulse width of an information reproduced signalobtained from the optical pickup; and a target value variable circuit for varying a controltarget value of the tilt controller based on the pulse width variation signal.
申请人：MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
代理机构：Renner, Otto, Boisselle & Sklar, PL.
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