Sensor for verification of genuineness of security paper
    5.
    发明授权
    Sensor for verification of genuineness of security paper 失效
    传感器用于验证安全性纸张的一般性

    公开(公告)号:US5122754A

    公开(公告)日:1992-06-16

    申请号:US572960

    申请日:1990-09-10

    申请人: Einar Gotaas

    发明人: Einar Gotaas

    CPC分类号: G07D7/002 G07D7/026 G07D7/04

    摘要: A method and a device for automatic verification of genuineness of a banknote or a document comprising a watermark is described. A two-part, doubly active capacitive sensor device (4, 6, 7) is used. A symmetry property of the sensor output signal is changed in a predetermined manner when a correct watermark is present in a coinciding position with shape-adapted capacitor electrodes (4, 6).

    摘要翻译: PCT No.PCT / FI89 / 00043 Sec。 371 1990年10月30日第 102(e)1990年10月30日PCT 1989年3月10日PCT公布。 公开号WO89 / 08898 日期:1989年9月21日。描述了一种用于自动验证纸币或包含水印的文档的真实性的方法和装置。 使用两部分双重活动的电容式传感器装置(4,6,7)。 当与形状适配的电容器电极(4,6)在重合位置存在正确的水印时,传感器输出信号的对称特性以预定的方式改变。

    Watermark detection
    7.
    发明授权
    Watermark detection 失效
    水印检测

    公开(公告)号:US4296326A

    公开(公告)日:1981-10-20

    申请号:US127789

    申请日:1980-03-05

    CPC分类号: G07D7/002 G07D7/20

    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。