G - Physics – 03 – H
Patent
G - Physics
03
H
G03H 1/18 (2006.01) B42D 15/10 (2006.01) B44F 1/12 (2006.01) G02B 5/30 (2006.01) G03H 1/02 (2006.01) G07D 7/00 (2006.01) G07D 7/12 (2006.01)
Patent
CA 2308466
A genuineness detecting film (10) includes at least a reflecting film (11) having a circularly polarized light selectivity such that it reflects only a left-handed or right-handed circularly polarized light out of incident lights and generates a reflected light. On the reflecting film (11), a hologram forming portion (11a) is provided. The hologram forming portion (11a) reflects the same circularly polarized light as the reflected light in a direction different from the direction in which the reflected light travels and thereby to form a hologram image. Sensors disposed in different positions sense the reflected light from the reflecting film (11) and the hologram image from the hologram forming portion (11a), respectively.
L'invention porte sur un film (10) de détection d'authenticité consistant au moins en un film (11) réfléchissant présentant une sélectivité vis-à-vis de la lumière à polarisation circulaire et ne réfléchissant que la lumière à polarisation circulaire droite ou gauche de lumières incidentes, et produisant une lumière réfléchie. Le film réfléchissant (11) comporte également une portion (11a) formatrice d'hologrammes réfléchissant la même lumière à polarisation circulaire que la lumière réfléchie dans un sens différent de celui de propagation de la lumière réfléchie, ce qui forme un hologramme. Des détecteurs placés en différents endroits captent respectivement la lumière provenant du film réfléchissant et l'hologramme provenant de la portion (11a) formatrice d'hologrammes.
Hoshino Hidekazu
Nishimura Suzushi
Sakakibara Mikihiko
Shiozawa Akihito
Suzuki Shinichiro
Dai Nippon Printing Co. Ltd.
Macrae & Co.
Nhk Spring Ltd.
Nippon Mitsubishi Oil Corporation
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