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    Semiconductor laser driving circuit
    3.
    发明公开
    Semiconductor laser driving circuit 失效
    TreiberschaltungfürHalbleiterlaser。

    公开(公告)号：EP0441709A2

    公开(公告)日：1991-08-14

    申请号：EP91400295.1

    申请日：1991-02-07

    申请人： COPAL COMPANY LIMITED ,  FUJITSU LIMITED

    发明人： Yoshikawa, Yukio ,  Ishii, Takeshi ,  Oyama, Yoshihiro ,  Sasaki, Tatsuo ,  Takahashi, Tamotsu ,  Sato, Shinichi ,  Moriya, Kazumasa ,  Shinoda, Ichiro ,  Itoh, Motohiko ,  Kashiwazaki, Tomoyuki ,  Kawai, Hiroaki ,  Watanabe, Mitsuo

    IPC分类号： H01S3/133 ,  H01S3/10 ,  G06K7/10

    CPC分类号： G06K7/10851 ,  G06K2207/1018 ,  H01S5/06825 ,  H01S5/06835

    摘要： A semiconductor laser driving circuit has a semiconductor laser (1) for emitting a laser beam according to a drive power. A photodetector (1b) is provided for effecting photo-electric conversion of the laser beam to output a corresponding electric signal. A monitoring circuit (101) is connected for monitoring the electric signal to output a monitor signal indicative of variation in intensity of the laser beam. A controlling signal (102) is connected for comparing the monitor signal with a given reference signal to output a control signal according to difference therebetween. A powering circuit (103) is operative according to the control signal to apply to the semiconductor laser a drive power effective to eliminate the difference. An abnormality detecting circuit is provided for comparing the monitor signal with a given limit signal which is set defferent from the reference signal to detect any abnormality and output a corresponding signal.

    摘要翻译： 半导体激光器驱动电路具有用于根据驱动功率发射激光束的半导体激光器（1）。 提供光电检测器（1b）用于实现激光束的光电转换以输出相应的电信号。 连接监视电路（101），用于监视电信号，输出表示激光束强度变化的监视信号。 连接控制信号（102）以将监视信号与给定的参考信号进行比较，以根据它们之间的差异输出控制信号。 供电电路（103）根据控制信号工作，以向半导体激光器施加有效消除差异的驱动功率。 提供一种异常检测电路，用于将监视信号与根据参考信号设置的给定限制信号进行比较，以检测任何异常并输出相应的信号。

    Article detection device and method for detecting the article
    5.
    发明公开
    Article detection device and method for detecting the article 失效
    Artikeltasteinrichtung und Verfahren zur Feststellung des Artikels。

    公开(公告)号：EP0424097A1

    公开(公告)日：1991-04-24

    申请号：EP90311327.2

    申请日：1990-10-16

    申请人： FUJITSU LIMITED

    发明人： Sato, Shinichi ,  Ishii, Takeshi ,  Takahashi, Tamotsu ,  Oyama, Yoshihiro ,  Sasaki, Tatsuo ,  Watanabe, Mitsuo ,  Shinoda, Ichiro ,  Katoh, Hiroaki ,  Kitamura, Nobuyuki ,  Ito, Motohiko ,  Kashiwazaki, Tomoyuki ,  Kawai, Hiroaki

    IPC分类号： G01S17/02 ,  G06K7/10

    CPC分类号： G06K7/10861 ,  G01S17/026 ,  G06K2207/1012

    摘要： An article detection device includes: a light emission unit (1) for emitting a detection light (DL) for irradiation onto an article; a light reception unit (2) for receiving a light (RL) reflected from the article; an analog-to-digital converter (3) for converting the reflected light to a digital signal; a first register (4a) for storing the digital signal after being sampled using a first sampling signal having a first period; a second register (4b) for storing the digital signal after being sampled using a second sampling signal having a second period shorter than the first period; and a control unit (5) for generating the first and second sampling signals to be sent to the first and second registers, reading the digital signal stored in the first and second registers, calculating a difference between the digital signals in the first register and second register, comparing an absolute value of the difference with a predetermined threshold value, and detecting the article when the absolute value is larger than the threshold value.

    摘要翻译： 一种物品检测装置，包括：发光单元（1），用于发射用于照射到物品上的检测光（DL）; 光接收单元（2），用于接收从物品反射的光（RL）; 用于将反射光转换成数字信号的模数转换器（3）; 第一寄存器（4a），用于在使用具有第一周期的第一采样信号采样之后存储数字信号; 第二寄存器（4b），用于使用具有比第一周期短的第二周期的第二采样信号在采样之后存储数字信号; 以及控制单元（5），用于产生要发送到第一和第二寄存器的第一和第二采样信号，读取存储在第一和第二寄存器中的数字信号，计算第一寄存器和第二寄存器中的数字信号之间的差值 寄存器，将差异的绝对值与预定阈值进行比较，以及当绝对值大于阈值时检测物品。