发明名称 |
MIT EINPRAEGUNGEN VERSEHENE GEGENSTAENDEN. |
摘要 |
A subtrate, (1) e.g. of thermoplastic or paper material, has embossed thereon first (2a) and second (2b) non-light diffracting relief elements which define first and second patterns, respectively. The patterned area is uniformly reflective. For example, the first relief elements (2a) form a background area in which are arranged the second elements (2b) in the shape of a company logo. The first (2a) and second (2b) relief elements are so strutured that when the direction of view thereof is changed from a first to a second direction the relative perceived distinctness of the first and second patterns is changed. The substrate may form part of a security document whose authenticity may be checked by ensuring that the relative distinctness of the two patterns changes with the angle of view. |
申请公布号 |
DE3684719(D1) |
申请公布日期 |
1992.05.14 |
申请号 |
DE19863684719 |
申请日期 |
1986.02.07 |
申请人 |
THOMAS DE LA RUE & CO. LTD., LONDON, GB |
发明人 |
CHATWIN, CHARLES EDWARD, HORSHAM WEST SUSSEX, GB |
分类号 |
B42D15/10;B44C1/17;B44F1/10;G06K19/08;G06K19/14 |
主分类号 |
B42D15/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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