Title:
MONOCHROMATIC LIGHT REGENERATIVE HOLOGRAM AND REGENERATIVE METHOD AND DEVICE THEREFORE
Document Type and Number:
Japanese Patent JP3186316
Kind Code:
B2
Abstract:
PURPOSE: To provide a monochromatic light regenerative hologram capable of preventing easy forgery with a dead copy, together with a regenerative method and device therefor.
CONSTITUTION: This monochromatic light regenerative hologram 100 is to regenerate a hologram image by radiating monochromatic light at a specific angle to a hologram recording zone 101 where an interference fringe for forming a hologram image is provided. A plurality of hologram image groups different from each other in the directivity of the interference fringe are multi-recorded in the zone 101 and at the same time, each type of monochromatic light is concurrently radiated at angles corresponding to respective fringes. As a result, each hologram image group is concurrently regenerated, thereby providing the feature of the constitution of a single information pattern consisting of a character 'OK'. Also, even when a laser beam is radiated to the zone 101 unidirectionally, only a part of the hologram image groups can be dead copied and, therefore, the forgery thereof can be prevented.
Inventors:
Takashi Sato
Yoshiaki Tada
Akihiko Kobayashi
Takehide Kita
Naoaki Shindo
Yoshiaki Tada
Akihiko Kobayashi
Takehide Kita
Naoaki Shindo
Application Number:
JP7056093A
Publication Date:
July 11, 2001
Filing Date:
March 29, 1993
Export Citation:
Assignee:
Toppan Printing Co., Ltd.
International Classes:
G03H1/18; G03H1/26; G07D7/12; (IPC1-7): G03H1/26; G07D7/12
Domestic Patent References:
| JP5173469A | ||||
| JP62283385A | ||||
| JP2256535A | ||||
| JP4914229A | ||||
| JP1273084A | ||||
| JP6373778U | ||||
| JP1502459A |
Attorney, Agent or Firm:
Shozo Ueda