Optical disc inclination detecting method, optical

专利名称：Optical disc inclination detecting method,

optical pickup device, and optical disc device

发明人：Atsushi Fukumoto,Shinichi Kai申请号：US09431839申请日：19991102公开号：US093296B1公开日：20021210

专利附图：

摘要：An optical disc inclination detecting method for detecting an inclination angle ofan optical disc with respect to a light spot, for recording information or reproducinginformation by irradiating the light spot on the optical disc by an optical pickup. The

method includes dividing the light spot into a main spot and both side spots in a specifiedtrack and track crossing directions before and after the specified track, detecting signalscorresponding to a reflected light from the optical disc by photo detectors

corresponding to the main spot and both side spots, and generating a DPP (differentialpush-pull) signal from signals corresponding to the main spot and both side spots. Themethod also generates a DPD (differential phase direction) signal by comparing phasesfrom the signals corresponding to the main spot, determining a differential operationvalue of the DPP and DPD signals, and detecting the inclination angle of the optical discbased on the differential operation value.

申请人：SONY CORPORATION

代理机构：Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

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