Optical encoding disc having light converging portions and...
Optical film and process for producing same
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
Optical information medium
Optical information medium
Optical information medium
Optical information medium
Optical information medium and its use
Optical information medium and recording method therefor