Device for scanning a rotating information carrier

Device for scanning an optically readable record carrier

Device for scanning an optically readable record carrier

Device for scanning optical discs using phase detection in a sys

Device for selecting magnetic head to be operated together with

Device for writing to or reading from optical recording media

Devices and methods to improve tracking error signals for...

Differential amplifier for optical detectors in an optical data

Differential phase error detector using dual arm correlation for

Diffraction grating element and optical pickup device...

Diffraction grating for an optical pickup device

Diffraction grating, optical pick-up, error signal detection...

Diffraction grating, optical pickup device and optical disc...

Digital compensator for controlling a servo to correct the value

Digital data record

Digital focus and tracking servo system

Digital focus and tracking servo system with one-track jump

Digital focus servo control apparatus for use in an optical disk

Digital focus servo system with a sliding notch filter

Digital servo apparatus for optical disc player