Optical head for recording and playing from optical disc

Optical head for recording, reproducing, or erasing information

Optical head having a fixed optical casing and a movable optical

Optical head having a grating with a doubly periodic structure

Optical head having a prism for splitting a beam of light into t

Optical head having a shading slit

Optical head having beam splitting surface curved to present a s

Optical head having focus error detection and tracking error det

Optical head having light transmissive carriage

Optical head in a device for recording and reading a data carrie

Optical head in a device for recording and reading a data carrie

Optical head including electrical circuit which produces...

Optical head including focusing error detecting system

Optical head including multiple photo detectors for reading sign

Optical head incorporating refractive index distribution changea

Optical head locating mechanism for magnetically locating an opt

Optical head of an optical disc recording/reproducing apparatus

Optical head of disk drive

Optical head seek controller for optical disk device

Optical head seek controller for optical disk device