Phase shifter and optical head device mounted with the same

Phase-change optical disc recording method and apparatus, and in

Phase-change optical disc recording method and apparatus, and in

Phase-change optical recording method using pulse width modulati

Phase-change type optical recording and reproducing method

Photo-detecting device for reproducing information recorded on a

Photo-detection device used in an optical pickup head for detect

Photo-electro-magnetic disc device

Photochromic recording with a recording and erasing temperature

Photodetector and optical pickup apparatus

Photodetector and optical pickup apparatus

Photodetector and optical pickup device

Photodetector disposed on both sides of an objective lens for re

Photodetector with regions to detect reflected light pass throug

Photodetector, diffraction grating, optical pickup and...

Photoelectric sensor, information recording system, and informat

Photoelectric sensor, information recording system, and informat

Photomagnetic head apparatus

Photorefractive, erasable, compact laser disk

Physically optimized optical disc structure, method and apparatu