发明名称 |
Optically Variable Security Device |
摘要 |
A method of recording an optically variable security device. The method comprises exposing an object ( 3 ) to a coherent beam of diffuse light; causing the resultant light to interfere with a reference beam ( 5 ) and recording the resultant interference pattern on or in a record medium ( 4 ). An aperture mask ( 9 ) is located upstream or downstream of the object ( 3 ) with respect to the direction of the diffuse light beam such that different parts of the object are imaged on to respective different, non-overlapping parts of the record medium.
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申请公布号 |
US2007268536(A1) |
申请公布日期 |
2007.11.22 |
申请号 |
US20020520368 |
申请日期 |
2002.07.10 |
申请人 |
DE LA RUE INERNAIONAL LIMITED DE LA RUE HOUSE |
发明人 |
HOLMES BRIAN W.;DRINKWATER KENNETH J. |
分类号 |
G03H1/00;B42D15/00;B42D15/10;G03H1/04;G03H1/22 |
主分类号 |
G03H1/00 |
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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