Measurement of paper speed using laser speckle detection
    1.
    发明授权
    Measurement of paper speed using laser speckle detection 失效
    使用激光斑点检测测量纸张速度

    公开(公告)号:US06220686B1

    公开(公告)日:2001-04-24

    申请号:US09023457

    申请日:1998-02-13

    IPC分类号: B41J300

    摘要: In a postage printing device, a printer is employed to print postage indicia on mail pieces. The printer is preferably a noncontact printer such as an ink-jet printer. Printing occurs as the mail piece moves relative to the print head of the printer, which requires that reliable motion information (e.g. a print clock signal) be made available to the electronics driving the print head. The reliable motion is provided in a noncontact way, preferably by directing a laser beam toward the mail piece and detecting a moving speckle pattern in the light scattered from the mail piece.

    摘要翻译: 在邮资打印装置中,使用打印机在邮件上打印邮资标记。 打印机优选为非接触式打印机,例如喷墨打印机。 打印发生在邮件相对于打印机的打印头移动时,这就要求可靠的运动信息(例如打印时钟信号)可用于驱动打印头的电子设备。 以非接触方式提供可靠的运动,优选地通过将激光束引向邮件并检测从邮件散射的光中的移动散斑图案。