公开(公告)号：US5694204A

公开(公告)日：1997-12-02

申请号：US536354

申请日：1995-09-29

申请人： Shigeki Nakase ,  Shigeyuki Nakamura ,  Hiromi Shimano

发明人： Shigeki Nakase ,  Shigeyuki Nakamura ,  Hiromi Shimano

IPC分类号： G01B11/00 ,  G01C3/06 ,  G01S17/36 ,  G01C3/08

CPC分类号： G01S17/36

摘要： In a device 100 for measuring distance, a signal generating circuit 20 generates a driving signal. The driving signal is serially modulated in phase into at least three states. The signal generating circuit 20 further generates reference signals having frequencies the same as the driving signal. A light source 30 is driven by the driving signal to emit detection light which is time-divisionally modulated in phase in accordance with the driving signal. An optical detector 40 receives the detection light which has been emitted from the light source 30 and scattered and reflected by the target. The optical detector 40 generates a detection signal which is time-divisionally modulated in phase in accordance with the received detection light. Homodyne processing circuits 50 and 60 superimpose the detection signal and the reference signals to generate homodyne signals (interference signals). Temporal mean values of intensities of the homodyne signals are obtained. A gain controlling circuit 80 feed-back controls the gains in the circuits 50 and 60. A phase detecting circuit 70 measures the temporal mean values of intensities of the homodyne signals, and calculates a difference between a phase of the detection light emitted from the light source and a phase of the detection light received at the optical detector.

摘要翻译： 在用于测量距离的装置100中，信号发生电路20产生驱动信号。 驱动信号被相序串行调制成至少三个状态。 信号发生电路20还产生具有与驱动信号相同频率的参考信号。 光源30由驱动信号驱动，发射根据驱动信号相分时调制的检测光。 光检测器40接收从光源30发射并被目标散射和反射的检测光。 光检测器40根据接收的检测光产生相位时分调制的检测信号。 零差处理电路50和60叠加检测信号和参考信号以产生零差信号（干扰信号）。 获得零差信号强度的时间平均值。 增益控制电路80反馈控制电路50和60中的增益。相位检测电路70测量零差信号的强度的时间平均值，并且计算从光发射的检测光的相位之间的差 在光检测器处接收的检测光的源和相位。

公开(公告)号：US5548112A

公开(公告)日：1996-08-20

申请号：US359722

申请日：1994-12-20

申请人： Shigeki Nakase ,  Shigeyuki Nakamura ,  Tsuyoshi Ohta

发明人： Shigeki Nakase ,  Shigeyuki Nakamura ,  Tsuyoshi Ohta

IPC分类号： G01D5/30 ,  G01D5/36 ,  H01L31/10 ,  H01L31/107 ,  H03F3/08 ,  H03K17/78 ,  H04B10/07 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H04B10/67 ,  H04B10/80 ,  H01J40/14

CPC分类号： H03F3/087 ,  H01L31/107 ,  H04B10/6911

摘要： A photodetecting circuit using an avalanche photodiode of the present invention has an avalanche photodiode, and a bias control means for applying a bias voltage to the avalanche photodiode to drive the avalanche photodiode at a high multiplication factor. The bias control means has a diode having the same temperature dependence of a breakdown voltage as that of the avalanche photodiode, and a control circuit for applying positive and negative potentials with respect to the ground potential between the anode and the cathode of the diode such that the diode is set in a breakdown state at a predetermined current. A positive or negative potential is applied from one of the anode and the cathode of the avalanche photodiode as a bias voltage, and a photocurrent is output from the other terminal of the avalanche photodiode.

摘要翻译： 使用本发明的雪崩光电二极管的光检测电路具有雪崩光电二极管，以及偏置控制装置，用于向雪崩光电二极管施加偏置电压，以高倍增系数驱动雪崩光电二极管。 偏置控制装置具有与雪崩光电二极管的击穿电压相同的温度依赖性的二极管，以及用于相对于二极管的阳极和阴极之间的接地电位施加正和负电位的控制电路，使得 二极管以预定电流设置为击穿状态。 从雪崩光电二极管的阳极和阴极之一施加正电位或负电位作为偏置电压，并从雪崩光电二极管的另一端输出光电流。

公开(公告)号：US5578815A

公开(公告)日：1996-11-26

申请号：US272071

申请日：1994-07-08

申请人： Shigeki Nakase ,  Shigeyuki Nakamura ,  Tsuyoshi Ohta

发明人： Shigeki Nakase ,  Shigeyuki Nakamura ,  Tsuyoshi Ohta

IPC分类号： G01J1/44 ,  G01J1/42 ,  G05F3/18

CPC分类号： G05F3/18

摘要： A bias circuit for applying a bias voltage to an avalanche photodiode APD2 for detecting light comprises a first diode APD1, a power supply V.sub.H connected to the first diode APD1, for applying a voltage to make the diode in breakdown between an anode and a cathode of the first diode APD1, and a constant voltage circuit V2 connected to the avalanche photodiode APD2 for detecting light, for applying a voltage difference of a breakdown voltage generated between the anode and the cathode of the first diode APD1 minus a constant voltage to the avalanche photodiode. The constant voltage is substantially independent from current flowing in the avalanche photodiode APD2 for detecting light to the avalanche photodiode.

摘要翻译： 用于向用于检测光的雪崩光电二极管APD2施加偏置电压的偏置电路包括：第一二极管APD1，连接到第一二极管APD1的电源VH，用于施加电压以使二极管在阳极和阴极之间击穿 第一二极管APD1和连接到用于检测光的雪崩光电二极管APD2的恒压电路V2，用于将在第一二极管APD1的阳极和阴极之间产生的击穿电压的电压差减去恒定电压的雪崩光电二极管 。 恒定电压基本上独立于在雪崩光电二极管APD2中流动的电流，用于检测光到雪崩光电二极管。

公开(公告)号：US06411374B2

公开(公告)日：2002-06-25

申请号：US09863292

申请日：2001-05-24

申请人： Shigeki Nakase ,  Takaaki Kawai ,  Hiromichi Tozuka ,  Michito Hirayanagi

发明人： Shigeki Nakase ,  Takaaki Kawai ,  Hiromichi Tozuka ,  Michito Hirayanagi

IPC分类号： G01B1126

CPC分类号： G01S17/42 ,  G01C15/002 ,  G01S7/4811 ,  G01S7/4813 ,  G01S7/4817

摘要： A driving system region which is a region where a light projector, a light receiver, and a signal processing circuit are installed together is disposed on one side of an optical system region comprising a light-projecting region and a light-receiving region, so that wires such as their mutual signal lines are kept from passing through the optical system region, whereby an omnidirectional distance detecting apparatus capable of complete 360-degree omnidirectional distance detection can be obtained. The influence of electric noise caused by the driving system of rotary mechanism and the like upon light-receiving signals and the like is suppressed, whereby the accuracy in distance detection can be improved.

摘要翻译： 将光投射器，光接收器和信号处理电路安装在一起的区域的驱动系统区域设置在包括发光区域和受光区域的光学系统区域的一侧，使得 诸如它们的相互信号线之类的电线不会通过光学系统区域，从而可以获得能够完成360度全向距离检测的全方向距离检测装置。 由旋转机构等的驱动系统引起的电噪声对光接收信号等的影响被抑制，能够提高距离检测的精度。