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21 条记录 (耗时 0.011 秒)

    Infrared communication device
    3.
    发明公开
    Infrared communication device 有权
    红外通讯设备

    公开(公告)号：EP1615359A2

    公开(公告)日：2006-01-11

    申请号：EP05076622.9

    申请日：1998-08-14

    申请人： SHARP KABUSHIKI KAISHA

    发明人： Okuda, Takanori ,  Yokogawa, Naruichi

    IPC分类号： H04B10/158 ,  H03G3/30 ,  H03K5/08 ,  H03K5/1532

    CPC分类号： H03K5/1532 ,  H03G3/3084 ,  H03K5/084

    摘要： In a peak-hold circuit, a hold capacitor captures the peak value of an input signal and a reset section carries out a resetting operation on the holding value of the hold capacitor when, upon switching inputs, it receives a reset signal. The reset section, upon receipt of the reset signal, improves the response speed of a peak-hold section by a predetermined time period. The reset section is provided with a constant current circuit and a switching means for increasing a charging current and a discharging current of the peak-hold section respectively.

    摘要翻译： 在峰值保持电路中，保持电容器捕获输入信号的峰值，并且当切换输入时，保持电容器接收复位信号时，复位部分对保持电容器的保持值执行复位操作。 重置部分在接收到重置信号时将峰值保持部分的响应速度提高预定时间段。 复位部分设有恒流电路和用于分别增加峰值保持部分的充电电流和放电电流的开关装置。

    Light receiving amplifying device
    6.
    发明公开
    Light receiving amplifying device 有权
    元素（LichtempfangendesverstärkendesElement）

    公开(公告)号：EP0905925A2

    公开(公告)日：1999-03-31

    申请号：EP98306535.0

    申请日：1998-08-17

    申请人： Sharp Kabushiki Kaisha

    发明人： Yokogawa, Naruichi ,  Okuda, Takanori ,  Shimizu, Takayuki

    IPC分类号： H04B10/158

    CPC分类号： H04B10/114

    摘要： A light receiving amplifying device of the present invention includes (1) a light receiving device for outputting a light signal current which varies with a quantity of received light, (2) a load resistor connected with the light receiving device in series, for generating a detected voltage which varies with the light signal current, (3) a low frequency current bypass circuit for preventing the detected voltage from being saturated when the detected voltage has a frequency in a low frequency band, the low frequency current bypass circuit being connected with the load resistor in parallel and having an input impedance varying with a frequency of the detected voltage, (4) a transimpedance amplifying circuit (inverting amplifying circuit) for transforming an impedance of the detected voltage, and (5) a capacitor for coupling the low frequency current bypass circuit and the transimpedance amplifying circuit (inverting amplifying circuit). This makes it possible, with a relatively simple circuit and arrangement in an infrared communication receiver, to lower noises of the light receiving amplifying device while maintaining an operational range with respect to a DC photoelectric current.

    摘要翻译： 本发明的光接收放大装置包括：（1）用于输出随接收光量变化的光信号电流的光接收装置，（2）与光接收装置串联连接的负载电阻器，用于产生 检测电压随光信号电流而变化，（3）低频电流旁路电路，用于在检测电压具有低频带的频率时防止检测电压饱和，低频电流旁路电路与 负载电阻并联并具有随检测电压频率变化的输入阻抗，（4）用于变换检测电压的阻抗的跨阻放大电路（反相放大电路），以及（5）用于耦合低频的电容器 电流旁路电路和跨阻放大电路（反相放大电路）。 这使得通过红外通信接收机中相对简单的电路和布置可以降低光接收放大装置的噪声，同时保持相对于DC光电流的操作范围。

    Waveform-Shaping circuit and a data-transmitting apparatus using such a circuit
    7.
    发明公开
    Waveform-Shaping circuit and a data-transmitting apparatus using such a circuit 失效
    波形整形电路和使用这种电路的数据发送装置

    公开(公告)号：EP0844736A3

    公开(公告)日：1998-12-30

    申请号：EP97309327.1

    申请日：1997-11-19

    申请人： Sharp Kabushiki Kaisha

    发明人： Shimizu, Takayuki ,  Yokogawa, Naruichi

    IPC分类号： H03K5/08

    CPC分类号： H03K5/082 ,  H04B10/695 ,  H04L25/062

    摘要： In an infrared data-receiving circuit wherein an output electric current of a photodiode is current-to-voltage converted by a preamplifier and, after having been amplified by an amplification circuit, is subjected to a waveform-shaping operation in a comparator by using a predetermined threshold value, the threshold voltage, upon receipt of a low signal voltage, is set at the average value Vav that has been formed by two LPFs and, upon receipt of a high signal voltage, is also set at a shift value that has been obtained by allowing the voltage, which has been generated by shifting of a level shift circuit, to be sampled by a peak-hold circuit constituted of a differential amplifier. Thus, the apparatus is allowed to deal with a wide dynamic range. Moreover, in this arrangement, a single capacitor may be commonly used for an integrating operation in the LPFs and for a holding operation in the peak-hold circuit so as to provide a simple construction that is preferably applied to an integrated circuit. Consequently, in the infrared data-receiving circuit that uses the output from the photodiode by subjecting it to the waveform-shaping operation, it becomes possible to deal with a wide range of level differences by using a simple construction.

    摘要翻译： 在一个红外数据接收电路中，其中光电二极管的输出电流由前置放大器进行电流 - 电压转换，并且在被放大电路放大后，在比较器中用一个波形整形操作 预定的阈值，阈值电压在接收到低信号电压时被设置为由两个LPF形成的平均值Vav，并且在接收到高信号电压时也被设置为已经 通过允许由电平移位电路的移位产生的电压通过由差分放大器构成的峰值保持电路来采样。 因此，该设备被允许处理宽动态范围。 而且，在这种布置中，单个电容器可以共同用于LPF中的积分操作和峰值保持电路中的保持操作，从而提供优选应用于集成电路的简单结构。 因此，在利用光电二极管的输出进行波形整形操作的红外数据接收电路中，通过使用简单的结构就可以处理宽范围的电平差。

    Optical pickup using holographic optical element
    9.
    发明公开
    Optical pickup using holographic optical element 失效
    Optischer Abtaster mit全息照相机。

    公开(公告)号：EP0478222A2

    公开(公告)日：1992-04-01

    申请号：EP91308539.5

    申请日：1991-09-19

    申请人： SHARP KABUSHIKI KAISHA

    发明人： Nagahama, Toshiya ,  Yamada, Shigehiro ,  Yokogawa, Naruichi ,  Seike, Yasushi ,  Yoshifusa, Koji

    IPC分类号： G11B7/135 ,  G11B7/12 ,  G11B7/13

    CPC分类号： G11B7/131 ,  G11B7/123 ,  G11B7/1353

    摘要： An optical pickup using holographic optical element includes a light source, a lens system for converting an optical beam output from the light source onto a recording carrier, a photodetector for detecting reflected light from the recording carrier and a diffraction grating for introducing the reflected light from the recording carrier to the photodetector in a light path connecting the recording carrier and the light receiving element, the photodetector comprises a photodiode and a signal processing circuit which at least amplifies output signal of the photodiode.

    摘要翻译： 使用全息光学元件的光学拾取器包括光源，用于将从光源输出的光束转换到记录载体上的透镜系统，用于检测来自记录载体的反射光的光电检测器，以及用于将来自 记录载体到连接记录载体和光接收元件的光路中的光电检测器，光电检测器包括光电二极管和至少放大光电二极管的输出信号的信号处理电路。