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1. (WO1991006925) OPTICAL DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/006925 International Application No.: PCT/GB1990/001613
Publication Date: 16.05.1991 International Filing Date: 19.10.1990
Chapter 2 Demand Filed: 03.05.1991
IPC:
G06K 19/02 (2006.01)
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
K
RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
19
Record carriers for use with machines and with at least a part designed to carry digital markings
02
characterised by the selection of materials, e.g. to avoid wear during transport through the machine
Applicants:
AMBLEHURST LIMITED [GB/GB]; 3/5 Burlington Gardens London W1A 1DL, GB (AllExceptUS)
CHATWIN, Charles, Edward [GB/GB]; GB (UsOnly)
KAY, Ralph [GB/GB]; GB (UsOnly)
GOMME, Martin, Christopher [GB/GB]; GB (UsOnly)
EZRA, David [GB/GB]; GB (UsOnly)
Inventors:
CHATWIN, Charles, Edward; GB
KAY, Ralph; GB
GOMME, Martin, Christopher; GB
EZRA, David; GB
Agent:
GILL JENNINGS & EVERY; 53/64 Chancery Lane London WC2A 1HN, GB
Priority Data:
8924111.126.10.1989GB
Title (EN) OPTICAL DEVICE
(FR) DISPOSITIF OPTIQUE
Abstract:
(EN) An optical security device for use on a security article comprises a number of layers including an optically diffracting layer (2) and an at least partially reflective layer (5) which together generate a first image. A non-optically diffracting second image (4) is provided within the device in association with the first image.
(FR) Un dispositif optique de sécurité utilisé sur un article de sécurité comprend un certain nombre de couches comportant une couche (22) de diffraction optique, ainsi qu'au moins une couche (5) partiellement réfléchissante, lesquelles produisent ensemble une première image. Une seconde image (4) non optiquement diffractante, est ménagée à l'intérieur du dispositif, en association avec la première image.
Designated States: AU, BR, CA, FI, GB, JP, KR, NO, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
ES2104615EP0497837US5310222DE000069030924AU1990066338