Title:
FORGERY PREVENTING OPTICAL INTERFERENCE FILM
Document Type and Number:
Japanese Patent JP3435840
Kind Code:
B2
Abstract:
PURPOSE: To provide a laminate having sufficient optical interference, good in close adhesiveness and incapable of clearly distinguishing layers by forming a membrane from simple layers of which the constitutional components are almost near each other.
CONSTITUTION: A forgery preventing optical interference film is obtained by alternately laminating a high refractive index ceramic layer 202 and a low refractive index ceramic layer 201 on a base material 1 in specific optical film thickness and both ceramic layers are composed of silicon oxide and regulated in refractive index by the element ratio with oxygen.
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Inventors:
Haruo Uyama
Takahiro Harada
Takahiro Harada
Application Number:
JP23495094A
Publication Date:
August 11, 2003
Filing Date:
September 29, 1994
Export Citation:
Assignee:
Toppan Printing Co., Ltd.
International Classes:
B32B7/02; B32B18/00; B41M3/14; B42D15/10; (IPC1-7): B32B7/02; B32B18/00; B41M3/14; B42D15/10
Domestic Patent References:
| JP59202899A | ||||
| JP6013598A | ||||
| JP2277686A | ||||
| JP2281202A |