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公开(公告)号：US4296326A
公开(公告)日：1981-10-20
申请号：US127789
申请日：1980-03-05
IPC分类号： G07D7/00 , G01N21/89 , G01N21/892 , G07D7/12 , G07D7/20 , G01J1/42 , B42D15/00 , G01N21/38 , G06K9/74
摘要： In a method of detecting sheets which do not have a genuine watermark (i.e. watermarks which result from variations in fibre distribution introduced during manufacture) the absorption of ultra-violet radiation is measured for each sheet in the area in which the watermark is expected to be present, and the transmittance of light by this area of the sheet is also measured. Sheets for which the absorption measurement does not show a substantially constant value, and sheets for which the light-transmittance shows a substantially constant value over the said area, are rejected. The absorption measurement is preferably effected by measuring the reflectance of ultra-violet radiation by the sheet, but the transmittance of ultra-violet radiation or the fluorescence of the sheet in the presence of ultra-violet radiation can also be measured. The measured value for the area can be compared with a reference value obtained by a measurement of the same parameter outside the watermark area.
摘要翻译： 在检测不具有真正水印的纸张的方法（即，由制造过程中引入的纤维分布变化而产生的水印）时，测量水印预期的区域中的每张纸的紫外线辐射的吸收 并且还测量该片材的该区域的光的透射率。 吸收测量值不显示基本恒定的纸张，并且在该区域上透光率显示出基本上恒定的值的纸张被拒绝。 吸收测量优选通过测量片材的紫外辐射的反射率来实现，但是也可以测量在紫外辐射的存在下紫外辐射的透射率或片的荧光。 该区域的测量值可以与通过在水印区域之外的相同参数的测量获得的参考值进行比较。
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公开(公告)号：US4645240A
公开(公告)日：1987-02-24
申请号：US726598
申请日：1985-04-23
摘要： This invention relates to documents, such as banknotes, which are produced and used in large numbers and which, for a given series, are identical one with another except for a unique multi-digit number upon each individual document, the number thus uniquely identifying that document within the series. According to the present invention, to render unauthorized reproduction of the document more difficult, on each document, at least two characters in the identifying number differ from each other (in addition to any differences in the letters or digits which they represent) in one or more visible characteristics. Thus the differing characters may have different heights or widths or be in different styles of type. Preferably, the identifying number appears twice on each document, in diagonally opposite corners, and preferably the variation of physical characteristics of the characters along the length of one of the numbers is reversed in direction in the other of the numbers.
摘要翻译： 本发明涉及大量生产和使用的纸币等，对于给定的系列，除了每个单独的文件上的独特的多位数字之外，对于给定的系列，这些文件是相同的，因此唯一地识别 系列内的文件。 根据本发明，为了使文件的未经授权的再现更加困难，在每个文档上，识别号码中的至少两个字符彼此不同（除了它们表示的字母或数字之间的任何差异） 更明显的特点。 因此，不同的字符可以具有不同的高度或宽度或者具有不同的类型。 优选地，识别号码在对角相对的角上在每个文档上出现两次，并且优选地，沿其中一个数字的长度的字符的物理特性的变化在另一个数字中的方向上颠倒。
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公开(公告)号：US5447335A
公开(公告)日：1995-09-05
申请号：US50181
申请日：1993-06-10
申请人： John M. Haslop
发明人： John M. Haslop
CPC分类号： B42D25/328 , B42D25/00 , B42D25/29 , B42D25/324 , B42D25/455 , B42D25/46 , B42D25/47 , G03H1/0011 , G03H1/02 , G03H1/0244 , G03H1/265 , G03H2001/0204 , G03H2001/2281 , G03H2210/20 , G03H2210/30 , G03H2210/32 , G03H2210/33 , G03H2210/52 , G03H2210/54 , G03H2250/42 , G03H2260/14
摘要： An authenticatable item and security device carry a number of symbols (4A, 4B, 4C, 6A, 6B, 6C) identifiable to the naked eye, there being at least two sets of at least three symbols. All the symbols within a set are substantially identical, are positioned in a non-overlapping, regular geometric arrangement, and at least one common viewing angle of inclination, exhibit substantially the same optical performance, the optical performance varying with inclination viewing angle.
摘要翻译： PCT No.PCT / GB91 / 02069 Sec。 371日期：1993年6月10日 102（e）日期1993年6月10日PCT 1991年11月22日PCT公布。 出版物WO92 / 09444 日期：1992年6月11日。可认证的物品和安全装置携带可识别为肉眼的多个符号（4A，4B，4C，6A，6B，6C），至少有两组至少三个符号。 一组中的所有符号基本相同，以不重叠的规则几何排列定位，并且至少一个共同的倾斜视角表现出基本上相同的光学性能，光学性能随倾斜视角而变化。
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公开(公告)号：USRE33802E
公开(公告)日：1992-01-21
申请号：US315464
申请日：1989-02-24
摘要： This invention relates to documents, such as banknotes, which are produced and used in large numbers and which, for a given series, are identical one with another except for a unique multi-digit number upon each individual document, the number thus uniquely identifying that document within the series. According to the present invention, to render unauthorized reproduction of the document more difficult, on each document, at least two characters in the identifying number differ from each other (in addition to any differences in the letters or digits which they represent) in one or more visible characteristics. Thus the differing characters may have different heights or widths or be in different styles of type. Preferably, the identifying number appears twice on each document; in diagonally opposite corners, and preferably the variation of physical characteristics of the characters along the length of one of the numbers is reversed in direction in the other of the numbers.
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