Optical: systems and elements – Holographic system or element – Authentication
Patent
1994-03-10
1996-04-02
Lerner, Martin
Optical: systems and elements
Holographic system or element
Authentication
235457, 283 86, 359 32, 356 71, G02B 532, G03H 122, G06K 710, G06K 974
Patent
active
055045944
ABSTRACT:
A method of reconstructing a hologram (1) recorded so that an image of a plurality of parallel bar-shaped patterns (3) is reconstructed. An image of the bar-shaped patterns (3) is reconstructed by using reconstructing light (2) having an incident region (A) in which a diameter in a direction parallel to the bar-shaped patterns (3), which are to be reconstructed by the hologram (1), is larger than a diameter in a direction intersecting perpendicularly to them. Even if a read sensor (4) is disposed in an out-of-focus position, the hologram (1) can be reconstructed with relatively high resolving power. Thus, the method minimizes restrictions on the position of the read sensor (4) and lowering of the read accuracy.
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Dai Nippon Printing Co. Ltd.
Lerner Martin
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