Phase comparing apparatus and focus error detecting apparatus
Phase shifting feedback control in an optical disk drive
Photo sensor device and optical pickup device
Photo-detecting device
Photo-detecting device
Photo-detecting device including offset correction
Photochromic optical disk read/write apparatus which prevents de
Photodetecting system for a magneto-optical disk head system
Photodetector unit, and optical pickup, optical reproduction...
Photodisc apparatus with gain control of tracking servo loop
Photodisc apparatus with means for canceling offset of tracking
Pick-up angle adjustment mechanism for optical disk apparatus
Pick-up device for optical disk readout using waveguide gratings
Pick-up point dislocation detecting device in recording a disc p
Pickup actuator
Pickup actuator for disk-type media
Pickup control device for optical disk drive which adjusts...
Pickup control method and apparatus, and disk unit with gain con
Pickup device
Pickup device and recording medium drive unit