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CN104066589A - 形成彩色激光图像的方法以及所得到的证件 - Google Patents

形成彩色激光图像的方法以及所得到的证件 Download PDF

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CN104066589A
CN104066589A CN201280067978.9A CN201280067978A CN104066589A CN 104066589 A CN104066589 A CN 104066589A CN 201280067978 A CN201280067978 A CN 201280067978A CN 104066589 A CN104066589 A CN 104066589A
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J·P·拉扎里
J·M·拉扎里
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Abstract

本发明涉及一种用于形成彩色激光图像的方法。通过激光束(8)对由彩色子像素(2)和无色区域组成的潜像进行个性化，所述激光束作用于位于彩色子像素(2)和无色区域下面的激光敏感层(3)，使得出现最终的个性化彩色激光图像。本发明适用于身份证件。

Description

形成彩色激光图像的方法以及所得到的证件
技术领域
本发明涉及形成彩色激光图像的方法。它尤其适用于身份证件的身份图像：身份证、信用卡、健康保险卡、护照、驾驶证、安全进入徽章等。
背景技术
专利WO 2011/124774A1描述了一种使用于身份证件的嵌入式潜像(latentimage)个性化的方法，所述身份证件包括嵌入透明保护层中的由像素矩阵组成的潜像，像素由彩色子像素构成。借助于穿过透明保护层作用的激光束，通过利用黑色非反射表面覆盖子像素来在子像素上生成灰度，从而生成最终彩色激光图像的灰度。这种处理方法用于使由彩色子像素构成的潜像个性化。
透过透明保护层通过反射来观察以这种方式个性化的图像。个性化的图像必须具有足够的反射性，以使得它能够在环境光中被观测，而无需附加光源。
专利申请No.11/00578描述了一种形成高度反射性激光图像的方法，所述高度反射性激光图像包括潜像，该潜像由被无色透明区域包围的彩色子像素组成并被覆盖在对激光辐射敏感的透明保护层(以下被称作“激光敏感(laserable)”层)中。激光束导致在此激光敏感保护层中出现非反射黑色表面，所述表面一定程度上覆盖彩色子像素的表面和无色表面以将灰度赋予个性化图像。通过下面的反射性子层(尤其是白色子层)上的反射或者透过清漆看到个性化图像，以便增加图像的反射率。图像反射率至关重要，因为它必须使得眼睛能够通过加性合成做出反应以将具有子像素的颜色的光束和来自无色区域的光束(通过入射光的背反射发射)集成。
尽管在一些方面是有利的，然而那些结构对个性化图像的质量有所限制。形成个性化图像的灰度的非反射黑色表面不是位于子像素上就是位于潜像的子像素上方，它们形成使最终个性化图像变暗的阴影效果。
发明内容
本发明的目的在于通过改进最终个性化图像的质量来补救现有技术的缺点。为此，本发明提出在由彩色子像素构成的潜像下面形成构成最终个性化图像的灰度的非反射表面。
更精确地，本发明提供了一种从包括透明保护层、由彩色子像素和无色表面构成的印刷的潜像、潜像下面的激光敏感层、反射装置的组件和激光束形成个性化彩色激光图像的方法，所述激光束穿过保护层，穿过潜像的子像素和无色表面，并在激光敏感层中形成最终个性化图像的灰度，所述组件被层压在介质上。
借助于软件来计算导致潜像个性化以便形成最终图像的灰度，所述软件采集原始图像，将其分割成子像素，计算对应色泽(color shade)，并确定在潜像的彩色子像素和无色区域下面的激光敏感层中将要碳化的灰度，以便获得与原始图像相同的色泽。
通过利用本领域技术人员已知的线性化软件与激光所沉积的能量成比例地进行一定程度的黑化，并且还通过改变碳化的区域，来获得个性化图像的灰度。
另外，根据激光束所穿过的子像素的颜色和无色区域来调节激光束的能量，因为需要根据子像素的颜色和无色区域的透明度来调节所需的激光能量。
作为非限制性示例，通过在激光束的影响下被碳化而形成个性化图像的灰度的激光敏感材料可由聚碳酸酯、特定的经处理的聚氯乙烯、经处理的丙烯腈-丁二烯-苯乙烯或经处理的聚对苯二甲酸乙二醇酯构成。
在本发明的具体实现方式中：
·身份证件的介质是白色的，并进行表面涂布以对激光辐射敏感，以便于形成个性化图像的灰度，由彩色子像素和无色区域构成的潜像被印刷在该表面上；
·潜像的彩色子像素被印刷在保护层的要被层压在激光敏感层上的表面上；
·激光敏感层是透明的。激光敏感层被层压到反射表面上，该反射表面可有利地由白颜色的证件的主体构成；
·证件的主体是透明的；并且
·在层压期间保护层被热压以形成透镜阵列。
激光敏感层的厚度或者证件介质的涂布部分的厚度应该尽可能薄，同时与所需的灰度相容。该厚度可有利地在几微米至大约几百微米的范围内。
通过胶印、喷墨印刷或者本领域技术人员已知的任何其它技术来印刷彩色子像素。无色区域或无色子像素用于增加最终图像的反射率。彩色子像素和无色区域被安排在平行列中或者均匀分布的小区域中。潜像可由三元组(triplet)或四元组(quadruplet)的彩色子像素构成。子像素的颜色优选地选自独立的颜色，即，将它们中的任两个混合无法形成第三子像素颜色。这些颜色包括红色、绿色和蓝色或者黄色、品红和青色。
在被称作“层压”的第二加工步骤中，保护层和激光敏感材料层在压力下通过热结合到身份证件的主体上，从而在保护层与激光敏感材料层之间嵌入彩色子像素和无色区域的矩阵。
在本发明的另一变型中，在层压期间，保护层可被模制以赋予其特定形状(例如透镜阵列)，从而使得特定入射角的激光束在潜像下面蚀刻，以对多个不同的彩色激光图像进行个性化。
导致灰度出现的激光碳化一定程度上阻挡了入射光以及穿过潜像的彩色子像素和无色区域的反射光，从而限制了可能使最终个性化图像模糊的干扰反射和阴影效果。
本发明还提供了一种包括通过执行上述方法而形成的个性化激光图像的证件。
该证件包括透明保护片、由彩色子像素的阵列和无色区域的阵列构成的潜像、位于潜像下面的激光敏感材料层、以及证件介质，所述片通过激光辐射而至少部分地碳化。保护片、潜像、激光敏感层和所述介质适合于被层压在一起。
在具体实施方式中：
·激光敏感层通过对证件的白色主体进行表面涂布来获得，由彩色子像素和无色区域构成的潜像被印刷在证件的主体的涂布表面上；
·潜像的子像素被印刷在保护层的要被层压在激光敏感层上的表面上；
·激光敏感层是透明的。激光敏感层被层压在反射表面上，该反射表面可有利地由证件的白色主体构成；
·证件的主体是透明的；并且
·在层压期间保护层被热压以赋予其透镜阵列的形式，从而使得激光能够在潜像上蚀刻多个不同的个性化彩色激光图像。
附图说明
从以下作为非限制性说明给出的描述，本发明可更清楚。该描述参照附图，附图中：
·图1是包括彩色激光图像的现有技术的身份证件的截面图；
·图2是本发明的第一实施方式的截面图；
·图3是本发明的第二实施方式的截面图；以及
·图4是本发明的第三实施方式的截面图。
具体实施方式
图1是包括彩色激光图像的现有技术的身份证件的截面图。透明保护层(4)、激光敏感层(3)和子像素的矩阵被层压在身份证件(1)的主体上。通过利用激光束进行碳化所生成的黑色表面(5)与潜像的彩色子像素(2)垂直配准。如果入射环境光线(6)没有准确地垂直于证件平面，则由黑色表面(5)投射在彩色子像素(2)上的阴影从子像素的区域显著溢出，从而创建使个性化图像变暗的阴影区域(7)。
图2是本发明的第一实施方式的截面图。身份证件的主体(1)是白色的。在该表面上涂布以创建激光敏感层(3)。在该层(3)上印刷包括彩色子像素(2)和无色区域的潜像。另选地，潜像可被印刷在透明保护层(4)上。保护层(4)被层压到组件上。激光束(8)在激光敏感层(3)中形成最终个性化图像的灰度(5)。在本发明中没有出现阴影区域。
图3是本发明的第二实施方式的截面。激光敏感材料的层(3)被层压在卡主体(1)上。彩色子像素(2)与无色区域一起被印刷在该激光敏感层(3)上，组件构成潜像。另选地，彩色子像素(2)可被印刷在保护层上。然后，保护层(4)被层压在组件上。
图4是本发明的第三实施方式的截面。通过对卡主体(1)进行表面涂布来在卡主体(1)上获得激光敏感层(3)。在变型中，该激光敏感层(3)被层压在卡主体(1)上。包括彩色子像素和无色区域的潜像(2)被印刷在激光敏感层(3)上。另选地，潜像可被印刷在保护层(4)上。保护层(4)被层压在之前的组件上。在层压期间，从观察者一侧看时其顶面被热压，以形成透镜阵列(9)。由于激光射线(8)和(8')具有相对于证件平面的特定入射角，所以它们在激光敏感层(3)中引起碳化，以在潜像的彩色子像素(2)下面形成两个不同的个性化图像(5)和(5')。通过入射光的背反射分别看到这两个彩色激光图像。在另选形式中，可形成三个个性化激光图像。

Claims (9)

1.一种从包括透明保护层、由彩色子像素和无色表面构成的印刷的潜像、所述潜像下面的激光敏感层和反射装置的组件以及激光束形成个性化彩色激光图像的方法，所述激光束穿过所述保护层，穿过所述潜像的所述子像素和所述无色表面，并且在所述激光敏感层中形成最终的个性化图像的灰度，所述组件被层压在介质上。
2.根据权利要求1所述的形成个性化彩色激光图像的方法，其中，所述激光敏感层(3)是通过对卡主体(1)进行表面涂布而获得的。
3.根据权利要求1所述的形成个性化彩色激光图像的方法，其中，所述激光敏感层(3)被层压在所述卡主体(1)上。
4.根据权利要求1至3中的任一项所述的形成个性化彩色激光图像的方法，其中，包括所述子像素(2)和所述无色区域的所述潜像被印刷在所述激光敏感层(3)的表面上。
5.根据权利要求1至4中的任一项所述的形成个性化彩色激光图像的方法，其中，所述保护层(4)的顶面被热压以形成透镜阵列(9)，该透镜阵列(9)使得能够蚀刻多个不同的个性化彩色激光图像。
6.一种包括个性化彩色激光图像的证件，所述个性化彩色激光图像是通过执行根据任何前述权利要求所述的方法而形成的，所述证件的特征在于它包括透明保护片、由彩色子像素的阵列和无色区域的阵列构成的潜像、位于所述潜像下面的激光敏感材料的层、以及证件介质，所述片通过激光辐射而至少部分地碳化，所述保护片、所述潜像、所述激光敏感层和所述介质适合于被层压在一起。
7.根据权利要求6所述的证件，其中，在所述保护层(4)的表面上形成透镜阵列(9)。
8.根据权利要求6所述的证件，其中，所述证件主体(1)是白色的。
9.根据权利要求6所述的证件，其中，所述证件主体(1)是透明的。
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WO2013093230A1 (fr) 2013-06-27
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