发明申请
- 专利标题: Retroreflective security features in secure documents
- 专利标题(中): 安全文件中的反光安全功能
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申请号: US11106364申请日: 2005-04-13
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公开(公告)号: US20050258637A1公开(公告)日: 2005-11-24
- 发明人: Daoshen Bi , Robert Jones , Chris Collins
- 申请人: Daoshen Bi , Robert Jones , Chris Collins
- 主分类号: B42D15/00
- IPC分类号: B42D15/00 ; B42D15/10
摘要:
Retroreflective material is used to create security features in secure documents. Retroreflective material in the document or sheets used for document creation is laser engraved to create optically variable images, identification quality grayscale images, different directional images viewable at corresponding angles of incidence, multidimensional images, and floating images. High refractive index glass beads are selectively applied to areas of a document surface using a variety of techniques. The beads may be applied in the form of a pre-determined or personalized pattern.
公开/授权文献
- US08062735B2 Retroreflective security features in secure documents 公开/授权日:2011-11-22
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