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1. 发明公开

EP1237435A2 COIN HAVING DIFFRACTION STRUCTURES 有权
标题翻译：硬币衍射结构
公开(公告)号：EP1237435A2
公开(公告)日：2002-09-11
申请号：EP01901160.0
申请日：2001-01-18
申请人： OVD Kinegram AG
发明人： TOMPKIN, Wayne, Robert , STAUB, René , HASLER, Andreas , JÜTZ, Jakob , MÜLLER, Martin
IPC分类号： A44C21/00
CPC分类号： A44C21/00 , G03H1/0011 , G03H1/0244 , G03H2270/13
摘要： The invention relates to a coin (1) which has a metallic surface (2, 3) and comprises macroscopic reliefs (5) that serve to visually indicate the value of the coin and as a legitimacy feature. Microscopically fine relief structures (8) that cause diffraction are placed directly inside at least one of the surfaces (2, 3). The relief structures (8) are preferably recessed and covered with a lacquer (9). In addition, it is advantageous when at least one portion of the relief structures (8) has an asymmetrical profile shape and/or the lattice vectors are radially aligned. The relief structures (8) can also contain a machine-readable coding which is recognized by cost-effective optical reading devices to be installed in coin examiners. The microscopic relief structure (8) can be provided on a hard material surface (2, 3) by removing material effected by exposing the material surface (2, 3) to a laser beam. The laser beam passes through a mask that determines the shape of the relief structures (8) and subsequently passes through an optical imaging system for size reduction. The exposure to light can be effected according to the two beam interference method. During an additional method, the microscopic relief structures (8) are etched into the material surface (2, 3).

2. 发明授权

EP1237435B1 COIN HAVING DIFFRACTION STRUCTURES 有权
标题翻译： COIN HAVING的绕射结构
公开(公告)号：EP1237435B1
公开(公告)日：2010-01-13
申请号：EP01901160.0
申请日：2001-01-18
申请人： OVD Kinegram AG
发明人： TOMPKIN, Wayne, Robert , STAUB, René , HASLER, Andreas , JÜTZ, Jakob , MÜLLER, Martin
IPC分类号： A44C21/00
CPC分类号： A44C21/00 , G03H1/0011 , G03H1/0244 , G03H2270/13
摘要： The invention relates to a coin (1) which has a metallic surface (2, 3) and comprises macroscopic reliefs (5) that serve to visually indicate the value of the coin and as a legitimacy feature. Microscopically fine relief structures (8) that cause diffraction are placed directly inside at least one of the surfaces (2, 3). The relief structures (8) are preferably recessed and covered with a lacquer (9). In addition, it is advantageous when at least one portion of the relief structures (8) has an asymmetrical profile shape and/or the lattice vectors are radially aligned. The relief structures (8) can also contain a machine-readable coding which is recognized by cost-effective optical reading devices to be installed in coin examiners. The microscopic relief structure (8) can be provided on a hard material surface (2, 3) by removing material effected by exposing the material surface (2, 3) to a laser beam. The laser beam passes through a mask that determines the shape of the relief structures (8) and subsequently passes through an optical imaging system for size reduction. The exposure to light can be effected according to the two beam interference method. During an additional method, the microscopic relief structures (8) are etched into the material surface (2, 3).

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