Dielectric recording medium, and method of and apparatus for...

Dielectric recording/reproducing head and dielectric...

Differential amplifier for optical detectors in an optical data

Differential detection assembly for data retrieval from a data s

Differential optical switch for data multiplexing in an optical

Differential phase error detector using dual arm correlation for

Differential track recording

Differential track recording

Diffraction device for reading and/or writing a record carrier

Diffraction element and optical head device equipped therewith

Diffraction element and optical pick-up apparatus having the...

Diffraction element and optical pick-up assembly

Diffraction grating and optical pickup apparatus with diffractin

Diffraction grating element and optical pickup device...

Diffraction grating for an optical pickup device

Diffraction grating using birefringence and optical head in whic

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

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

Diffraction optical element, molding die for the optical...

Diffraction type lens which converges two wavelengths of light