Optical disk, tracking error signal generating apparatus, and tr
Optical encoder having optical encoding disc with light...
Optical encoding disc having light converging portions and...
Optical having index mark and sector mark
Optical head system and its optical disc
Optical information carrier
Optical information carrier having a spacer securely bonded betw
Optical information carrier having buffer spaces for maintaining
Optical information carrier having interconnected buffer spaces
Optical information carrier having interconnected buffer spaces
Optical information carrier including standard and high density
Optical information medium
Optical information medium
Optical information medium
Optical information medium and recording method therefor
Optical information medium and recording method therefor
Optical information medium having a base plate made of polymethy
Optical information medium having paired wobble pitts with conti
Optical information medium with sample mark area and multiple tr
Optical information medium, recording and reproduction...