Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Masaki Matsuda0
Date of Patent
June 23, 2009
0Patent Application Number
117833850
Date Filed
April 9, 2007
0Patent Primary Examiner
Patent abstract
According to an embodiment of the present invention, a semiconductor device used in an optical disk device driving an optical disk, includes: an optical pickup device detecting an optical signal irradiated to the optical disk and converting the detected optical signal into an electric signal to output the electric signal; and a light amount detecting circuit amplifying the electric signal output from the optical pickup device, the optical pickup device including a plurality of light receiving elements different in receiving sensitivity and the light amount detecting circuit including at least one amplifier or two or more amplifiers of the same amplifying characteristics.
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