Photodiode with improved performance in ambient light
    5.
    发明申请
    Photodiode with improved performance in ambient light 有权
    光电二极管在环境光下具有改进的性能

    公开(公告)号:US20080203164A1

    公开(公告)日:2008-08-28

    申请号:US11711982

    申请日:2007-02-28

    IPC分类号: G06K7/10

    CPC分类号: G06K7/10554 G06K7/10851

    摘要: An arrangement for improving performance of a sensor operative for collecting light from a target to generate a data signal in a presence of ambient light, includes a sample and hold circuit for operating the sensor during a sampling time period in which the sensor only collects the ambient light to generate an ambient signal, and during a holding time period in which the sensor collects both the ambient light and the light from the target to generate a composite signal comprised of the ambient signal and the data signal; and a subtracting circuit operative for subtracting the ambient signal from the composite signal to produce the data signal as an output.

    摘要翻译: 用于改善传感器的性能的装置,该传感器用于在存在环境光的情况下收集来自目标的光以产生数据信号,包括用于在传感器仅收集环境的采样时间段期间操作传感器的采样和保持电路 光产生环境信号,并且在传感器收集来自目标的环境光和光的保持时间段期间,以产生由环境信号和数据信号组成的复合信号; 以及减法电路,用于从复合信号中减去环境信号以产生数据信号作为输出。

    Laser power control arrangements in electro-optical readers
    8.
    发明申请
    Laser power control arrangements in electro-optical readers 有权
    电光读取器中的激光功率控制装置

    公开(公告)号:US20070133633A1

    公开(公告)日:2007-06-14

    申请号:US11239745

    申请日:2005-09-30

    IPC分类号: H01S3/13 H01S3/00

    摘要: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.

    摘要翻译: 激光功率控制装置在检测到不符合预先制定的监管标准的过功率状况时,会中断电光读取器中使用的激光的电源。 在一个实施例中,在操作模式期间,将两个操作点处的激光驱动电流之间的差与在校准模式期间相同的两个操作点处的激光驱动电流之间的差异进行比较。 当在操作模式期间的差超过校准模式期间的差异预定量时,识别过功率状况。 在另一个实施例中,激光器仅被激励以在远低于监管标准的降低功率水平下发射光束,以便即使电动机驱动器失效也可以凝视。

    Photodiode with improved performance in ambient light
    9.
    发明授权
    Photodiode with improved performance in ambient light 有权
    光电二极管在环境光下具有改进的性能

    公开(公告)号:US07891570B2

    公开(公告)日:2011-02-22

    申请号:US11711982

    申请日:2007-02-28

    IPC分类号: G02B26/10

    CPC分类号: G06K7/10554 G06K7/10851

    摘要: An arrangement for improving performance of a sensor operative for collecting light from a target to generate a data signal in a presence of ambient light, includes a sample and hold circuit for operating the sensor during a sampling time period in which the sensor only collects the ambient light to generate an ambient signal, and during a holding time period in which the sensor collects both the ambient light and the light from the target to generate a composite signal comprised of the ambient signal and the data signal; and a subtracting circuit operative for subtracting the ambient signal from the composite signal to produce the data signal as an output.

    摘要翻译: 用于改善传感器的性能的装置,该传感器用于在存在环境光的情况下收集来自目标的光以产生数据信号,包括用于在传感器仅收集环境的采样时间段期间操作传感器的采样和保持电路 光产生环境信号,并且在传感器收集来自目标的环境光和光的保持时间段期间,以产生由环境信号和数据信号组成的复合信号; 以及减法电路,用于从复合信号中减去环境信号以产生数据信号作为输出。

    Laser power control arrangements in electro-optical readers
    10.
    发明授权
    Laser power control arrangements in electro-optical readers 有权
    电光读取器中的激光功率控制装置

    公开(公告)号:US07609736B2

    公开(公告)日:2009-10-27

    申请号:US11239745

    申请日:2005-09-30

    IPC分类号: H01S3/00

    摘要: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.

    摘要翻译: 激光功率控制装置在检测到不符合预先制定的监管标准的过功率状况时,会中断电光读取器中使用的激光的电源。 在一个实施例中,在操作模式期间,将两个操作点处的激光驱动电流之间的差与在校准模式期间相同的两个操作点处的激光驱动电流之间的差异进行比较。 当在操作模式期间的差超过校准模式期间的差异预定量时,识别过功率状况。 在另一个实施例中,激光器仅被激励以在远低于监管标准的降低功率水平下发射光束,以便即使电动机驱动器失效也可以凝视。