Optical apparatus used for optical disk recording and...

Optical apparatus with laser light receiver and focus error...

Optical apparatus, tracking apparatus and optical disk...

Optical arrangement and a reading apparatus

Optical assembly comprising a holder and an optical element, and

Optical axis monitoring device

Optical axis shift correcting device and method, and...

Optical beam focusing and tracking system for an optical disk in

Optical beam position active sensing and control using...

Optical beam shaping system

Optical beam system for optical disk drives

Optical beam tracking system for use in optical information reco

Optical beam-splitting element

Optical card

Optical card analyzing apparatus

Optical card and a recording/reproduction apparatus for the same

Optical card apparatus for re-seeking by moving an optical head

Optical card information recording/reproducing apparatus with de

Optical card reading and writing method with redundant directory

Optical card recording and reproducing device