公开(公告)号：US4376887A

公开(公告)日：1983-03-15

申请号：US207969

申请日：1980-09-22

申请人： David L. Greenaway ,  Joseph A. Clarinval ,  Alex Nyfeler

发明人： David L. Greenaway ,  Joseph A. Clarinval ,  Alex Nyfeler

IPC分类号： G06K1/12 ,  G06K7/14 ,  G06K13/07 ,  G06K19/06 ,  G06K7/10

CPC分类号： G06K1/126 ,  G06K13/07 ,  G06K7/14 ,  Y10S283/904

摘要： An apparatus adapted for thermally erasing or changing machine readable optical markings previously entered on a carrier of thermoplastic material which has two major sides, and wherein the optical markings cause a predetermined modification of any light rays impinging on the optical markings by either diffraction or refraction, include a erasing device adapted to be located on one major side of the carrier, for erasing or changing the markings, a reading device, operative during operation of the erasure device, and including at least two light sensors adapted to be located on the other major side of the carrier, so as to check the erasure or change of the markings effected by the erasing device. The light sensors provide output signals of respective opposite polarities following erasure or change of any one of the markings. A moving device generates a relative movement between the carrier and the erasing and reading devices, respectively, and a comparator is postcoupled to the light sensors, and includes a detector for indicating whether the output of the comparator exceeds or is below respective predetermined limits. A control device controls the operation of the erasing device of the moving device and is arranged to inhibit the operation of the erasure device when the output of the comparator exceeds or falls below the limits, respectively, so that the limits establish a uniform criterion for effecting erasure of the markings.

摘要翻译： PCT No.PCT / CH79 / 00140 Sec。 371日期1980年9月22日 102（e）日期1980年9月22日PCT提交1979年10月29日PCT公布。 公开号WO80 / 01616 日期1980年8月7日。一种适于热擦除或改变先前输入到具有两个主要侧面的热塑性材料的载体上的机器可读光学标记的设备，并且其中光学标记引起对光学入射的任何光线的预定修改 通过衍射或折射的标记包括适于位于载体的一个主侧上的擦除装置，用于擦除或改变标记，读取装置在擦除装置的操作期间操作，并且包括至少两个适于 位于载体的另一个主要侧面，以便检查由擦除装置实现的标记的擦除或改变。 光传感器在擦除或改变任何一个标记之后提供相应极性的输出信号。 移动装置分别在载体和擦除和读取装置之间产生相对移动，并且将比较器后耦合到光传感器，并且包括用于指示比较器的输出是否超过或低于相应预定极限的检测器。 控制装置控制移动装置的擦除装置的操作，并且当比较器的输出超过或低于极限时，禁止擦除装置的操作，使得限制建立均匀的标准来实现 擦除标记。