公开(公告)号：EP0652529A1

公开(公告)日：1995-05-10

申请号：EP94914617.9

申请日：1994-05-13

申请人： HITACHI MAXELL, LTD.

发明人： NISHIDA, Masato ,  ISHITUKA, Tomoaki ,  OSHIMA, Toshio

IPC分类号： G06K7/00

CPC分类号： G06K7/10594 ,  G06K7/12 ,  Y10S283/901

摘要： A high-reliability optical mark reader for a latent image mark capable of accurately reading code information of a latent image mark. The reader comprises a projector element (4) for projecting onto the surface of the latent image mark (15), which contains a fluorescent substance and has specified information, light having a wavelength for excitation of the fluorescent substance, and a light receiving element (8) for receiving fluorescence emitted from the surface of the latent image mark (15). A range where a latent image mark is readable is defined with an intersection of optical axes of the projector element and the light receiving element as a reference, and a crossing angle (ϑ) of the two optical axes is restricted to 40° or less.

摘要翻译： 一种用于能够准确地读取潜像标记的代码信息的潜像标记的高可靠性光标读取器。 读取器包括：投影仪元件（4），用于投射到包含荧光物质并具有指定信息的潜像标记（15）的表面上，具有用于激发荧光物质的波长的光和光接收元件（ 8）用于接收从潜像标记（15）的表面发射的荧光。 通过投影元件和受光元件的光轴的交点作为基准来定义潜像标记可读的范围，并且两个光轴的交叉角（θ）限制在40°以下。