Optical memory system having improved positioning and focusing c

Optical memory system having track following and seeking capabil

Optical memory system providing improved focusing control

Optical output controlling method and apparatus

Optical pick-up device

Optical pick-up unit

Optical pickup device

Optical pickup driver having piezoelectric elements of...

Optical pickup having a driving unit for moving objective lens

Optical read/write apparatus

Optical reading device and optical recording device

Optical record carrier and apparatus for reading the record carr

Optical record carrier reader calculating track pitch and write

Optical recording and reproducing apparatus

Optical recording and reproducing apparatus having a multi-spot

Optical recording and reproducing apparatus having discrete opti

Optical recording and reproducing apparatus making access by mul

Optical recording and reproducing system having an accurate high

Optical recording and/or reproducing apparatus with synchronous

Optical recording apparatus