Optical direction sensor having gray code mask spaced from a plu
Optical disc apparatus and method for controlling focus of...
Optical disc apparatus having five light receiving areas for det
Optical disc device
Optical disc head with high signal-to-noise ratio
Optical disc read/write apparatus
Optical disc system including focus capture assembly with focus
Optical disk apparatus
Optical disk apparatus and pickup unit
Optical disk checkup/measuring apparatus
Optical displacement measuring system with nonlinearity correcti
Optical distance measuring system using a position sensitive dev
Optical element driving mechanism
Optical element, optical head and optical information processor
Optical focus evaluation and focus adjustment methods, focus eva
Optical focus phase shift test pattern, monitoring system and pr
Optical focus sensor system
Optical focusing control apparatus
Optical focusing device
Optical focusing device with two controls