To surely record and reproduce two-dimensional image recorded in a hologram pattern.
To determine the positions of an optical card 10 in the lengthwise direction (direction X) and width direction (direction Y), a round-hole 17a and a slotted hole 17b are formed straight in the lengthwise direction X to penetrate in the direction of the thickness Z in the area except the recording area of the optical card 10, and they specify the X- and Y-directions of the optical card 10 based on the straight line connecting the round hole 17a and the slotted hole 17b even if the optical card 10 is deformed. Moreover, a region of a recording area 12 on the surface irradiated with a laser beam on the substrate 11 is formed on the bottom of a recessed part or inside thereof, to prevent fingerprints from leaving on the surface irradiated with the laser beam (on the substrate 11).
AIZAWA TADASHI
UENO YOROZU
NAKAMURA SHINJI
AKITA KOJI
YAMANE KOICHI
WAKATSUKI ATSUSHI
HOSHIKAWA TOMOYUKI
ICHIHARA NAOHISA
NTT DATA CORP
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