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 device positioning arrangement in an information disc pl
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