OPTICAL DISC INCLINATION DETECTING METHOD, OPTICAL DISC INCLINATION CONTROLLING METHOD, OPTICAL PICKUP DEVICE, AND OPTICAL DISC DEVICE

摘要

The present invention relates to a simple structure and radial tilt of the disk with high accuracy (radial tilt) of an optical disk tilt detection method which can detect an optical pickup device and optical disk device. ; To the detection signal from the light from the disc tilt detection method, an optical disk 7, the main spot and the two side detector or track of both side spots of the spot cross direction (A to H) from the light reflected by the subtraction or addition, generating a DPD signal or the 3-spot error signal the other hand, by comparing the detection signal of the phase detector in the vertical direction (a to D) in the track crossing direction of the main spot is created the DPD signal and the differential value is determined, the optical disk since the inclination angle is detected based on the differential value, thereby detecting the radial tilt angle of the optical disk. ; An optical disk, the optical pickup apparatus, a tilt angle of radiation, the main spot and side spots, a detector