发明名称 |
Method of forming a retroreflective material via light interference fringe patterns |
摘要 |
Retroreflective material including a medium containing a plurality of diffraction elements comprising light interference fringe patterns is formed by pressing a first medium having on a surface thereof a plurality of light interference fringe patterns defining an array of phase modulated fresnel zone plates onto a surface of a copy medium having a thickness equal to a given focal length associated with the fresnel zone plates and a reflective material is coated on the opposite surface of the copy medium. In making other embodiments a plurality of fringe patterns is recorded throughout the volume of a photosensitive medium.
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申请公布号 |
US4095875(A) |
申请公布日期 |
1978.06.20 |
申请号 |
US19770791958 |
申请日期 |
1977.04.28 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
LEE, PUI KUM;STREHLOW, WOLFGANG H. |
分类号 |
G02B5/12;G02B27/44;(IPC1-7):G02B5/18 |
主分类号 |
G02B5/12 |
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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