Optical: systems and elements – Holographic system or element – Authentication
Patent
1993-12-21
1996-01-23
Lerner, Martin
Optical: systems and elements
Holographic system or element
Authentication
235457, 283 86, 359 22, 359 24, 359 32, G02B 532, G03H 128
Patent
active
054869331
ABSTRACT:
A monochromatic-light reproduction type hologram having a hologram recorded area provided with interference fringes that form a hologram image, the hologram image being reproducible by irradiating the hologram recorded area with monochromatic light at a given angle. A plurality of hologram images different from each other in the directionality of interference fringes are multiple-recorded in the hologram recorded area. Alternatively, the hologram recorded area is divided into a plurality of regions so that a plurality of hologram images different from each other in the directionality of interference fringes are separately recorded in the divided regions. The recorded area is successively or simultaneously irradiated with monochromatic light rays at given angles corresponding to the directionality of interference fringes of the respective hologram images, to reproduce the hologram images as a plurality of information patterns or a single information pattern. The reproduced information pattern(s) can be utilized as identity information for judgment on whether or not an article is genuine, and also no more than a dead copy of part of the hologram image that constitutes a single information pattern can be produced even if laser light is made incident on the hologram recorded area from one direction, so that its forgery can be prevented.
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Kita Takehide
Kobayashi Akihiko
Matsudaira Nagahisa
Sato Atsushi
Sato Takashi
Lerner Martin
Toppan Printing Co. Ltd.
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