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1. 发明专利

JP2006040975A Led drive circuit 有权
标题翻译： LED驱动电路
公开(公告)号：JP2006040975A
公开(公告)日：2006-02-09
申请号：JP2004214946
申请日：2004-07-22
申请人： Hamamatsu Photonics Kk , 浜松ホトニクス株式会社
发明人： SUZUKI TAKAYUKI , MEGURI SHINTARO , ASAHARA TAKASHI
IPC分类号： H01L33/00
CPC分类号： H05B33/0818 , Y02B20/347
摘要： PROBLEM TO BE SOLVED: To provide an LED drive circuit in which the characteristics can be improved. SOLUTION: The LED drive circuit 10 comprises first and second peaking current generation circuits 10e (second current source) and 10f (third current source), and a timing generating circuit 10b provides a transistor 10c with drive signals T2 and T3 such that first and second peaking currents are supplied from the first and second peaking current generation circuits 10e and 10f to the LED 11. Since the rising of the drive current becomes steep, dullness in emission output from the LED incident to the drive current can be corrected. In case of one peaking current, depression often occurs in the optical output when the peaking current is added to a main current but when two or more peaking currents are added in correspondence with the main current, depression can be reduced significantly and stabilized optical communication can be ensured. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供可以提高特性的LED驱动电路。解决方案：LED驱动电路10包括第一和第二峰值电流产生电路10e（第二电流源）和10f（第三电流源），定时产生电路10b为晶体管10c提供驱动信号T2和T3，使得第一和第二峰值电流从第一和第二峰值电流产生电路10e和10f提供给LED 11.由于驱动电流的上升变得陡峭，可以校正从入射到驱动电流的LED的发射输出的钝度。在一个峰值电流的情况下，当峰值电流加到主电流上时，光输出中经常发生抑制，但是当与主电流相对应的两个或多个峰值电流相加时，可以显着降低抑制，并且光通信可以稳定确保。版权所有（C）2006，JPO＆NCIPI

2. 发明专利

JP2006040976A Photodetector 审中-公开
标题翻译：光电探测器
公开(公告)号：JP2006040976A
公开(公告)日：2006-02-09
申请号：JP2004214949
申请日：2004-07-22
申请人： Hamamatsu Photonics Kk , 浜松ホトニクス株式会社
发明人： SUZUKI TAKAYUKI , MEGURI SHINTARO , ASAHARA TAKASHI
IPC分类号： H01L27/14 , H01L27/144 , H01L31/10
CPC分类号： H04B10/6931 , H01L31/02327
摘要： PROBLEM TO BE SOLVED: To provide a photodetector applicable to such communication as requiring a wide dynamic range at high speed.
SOLUTION: When photocurrent output from a photodiode 14 for detecting optical power lowers below a specified level, output from a comparator COMP1 is switched abruptly but since a low-pass filter SC removes harmonic components, its output, i.e. the voltage at a gain control terminal VG, lowers gradually. Since the amount of current flowing between the source-drain of an N type MOS transistor GCT for gain regulation being applied with that voltage decreases gradually, the amount of current flowing through a resistor R1 decreases and the resistance Rx of the combined resistor in a gain regulation amplifier AMP increases thus increasing the gain thereof up to a specified level. Although the time required for the output voltage to increase and saturate is within 3 μs, adverse effect on a PHY chip being connected with the post-stage can be suppressed by changing the gain of output voltage slowly.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供适用于需要高动态范围的通信的光电探测器。解决方案：当从用于检测光功率的光电二极管14的光电流输出降低到低于指定电平时，从比较器COMP1的输出突然切换，但是由于低通滤波器SC去除谐波分量，所以其输出，即增益控制端子VG逐渐降低。由于施加有该电压的用于增益调节的N型MOS晶体管GCT的源极 - 漏极之间的电流量逐渐减小，所以流过电阻器R1的电流量减小，并且组合电阻器的电阻Rx增益调节放大器AMP增加，从而将其增益提高到指定水平。虽然输出电压增加和饱和所需的时间在3μs以内，但是通过缓慢地改变输出电压的增益可以抑制与后级相连的PHY芯片的不利影响。版权所有（C）2006，JPO＆NCIPI

3. 发明专利

JP2006040974A Led drive circuit 有权
标题翻译： LED驱动电路
公开(公告)号：JP2006040974A
公开(公告)日：2006-02-09
申请号：JP2004214944
申请日：2004-07-22
申请人： Hamamatsu Photonics Kk , 浜松ホトニクス株式会社
发明人： SUZUKI TAKAYUKI , MEGURI SHINTARO , ASAHARA TAKASHI
IPC分类号： H01L33/00
CPC分类号： H04B10/502
摘要： PROBLEM TO BE SOLVED: To provide an LED drive circuit in which the characteristics can be improved. SOLUTION: A first current increase circuit 10i 4 consists of a first slow control section 10i 41 and a first supply circuit 10i 43 at the post-stage. From the output switching time of a first comparator 10i 2 , i.e. at the time of set temperature exceeding a reference potential Va, a temperature compensation current I T1 (ΔI1) is increased gradually in order to suppress lowering of emission output. Pulse width distortion and jitter are suppressed by increasing the temperature compensation current I T1 gradually by utilizing the charge/discharge function of a capacitor, i.e. by increasing the temperature compensation current I T1 over a time longer than the responsive pulse width of a photodetector receiving light from an LED 11. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供可以提高特性的LED驱动电路。解决方案：第一电流增加电路10i 由第一慢控制部分10i 41和/或第一电源电路10i 43 组成后期。从设定温度超过基准电位Va的第一比较器10i 2 的输出切换时间起，温度补偿电流I T1 （ΔI1）增大逐渐为了抑制排放量的下降。通过利用电容器的充放电功能逐渐增加温度补偿电流I T1 来抑制脉宽失真和抖动，即通过增加温度补偿电流I T1 在比接收来自LED 11的光的光电检测器的响应脉冲宽度更长的时间内。（C）2006年，JPO和NCIPI

4. 发明专利

JP2003069004A Semiconductor photodetector and photoirradiation timing detector 审中-公开
标题翻译：半导体光电检测器和光电时钟检测器
公开(公告)号：JP2003069004A
公开(公告)日：2003-03-07
申请号：JP2001256733
申请日：2001-08-27
申请人： Hamamatsu Photonics Kk , 浜松ホトニクス株式会社
发明人： OIKAWA TOMOHIRO , TERADA YOSHITAKA , SHIMIZU HIROMITSU , MEGURI SHINTARO
IPC分类号： B41J2/44 , H01L27/146 , H01L31/10 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To provide a photodetector which can perform precise timing detection and to provide a photoirradiation timing detector using the photodetector.
SOLUTION: A first photosensitive region PD1, a second photosensitive region PD2 and a third photosensitive region PD3 are arranged in this order in the scanning direction of a laser beam, i.e., the X-direction. The boundary line BL12 between the region PD1 and the region PD2 is at right angles to the X-direction, and the boundary line BL23 between the region PD2 and the region PD3 is crossed obliquely in the X-direction. The region PD1 and the region PD2 are electrically connected inside the same semiconductor substrate via a connection region PD13, and its output amounts to the sum of outputs from the regions PD1, PD3. The photoirradiation timing detector can be mounted on a color laser-beam printer or the like.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种可以执行精确的定时检测并且使用该光电检测器来提供光照射定时检测器的光电检测器。解决方案：在激光束的扫描方向，即X方向上，依次布置第一光敏区域PD1，第二感光区域PD2和第三感光区域PD3。区域PD1与区域PD2之间的边界线BL12与X方向成直角，区域PD2与区域PD3之间的边界线BL23在X方向上斜交。区域PD1和区域PD2经由连接区域PD13电连接在同一半导体衬底的内部，并且其输出量等于来自区域PD1，PD3的输出的总和。光照射定时检测器可以安装在彩色激光束打印机等上。

5. 发明专利

JPH05323220A SYNCHRONIZATION DETECTING DEVICE 失效
公开(公告)号：JPH05323220A
公开(公告)日：1993-12-07
申请号：JP12768992
申请日：1992-05-20
申请人： HAMAMATSU PHOTONICS KK
发明人： TERADA YOSHITAKA , YAMAGUCHI SEIJI , MEGURI SHINTARO
IPC分类号： G01J1/02 , G01J1/44 , G01R13/14 , G02B26/10 , H04N1/04 , H04N1/113
摘要： PURPOSE:To reduce the time fluctuation of synchronization timing due to the variation of light quantity without regarding whether the scanning direction of light beam is forward or back ward and to obtain the synchronization detecting device without faulty operation against noises. CONSTITUTION:The light receiving surface of photodiodes PD1-PD3 is disposing along the scanning direction of light beam. An amplifier A, amplifying the output current of photodiodes, executing I/V conversion and outputting a voltage V1 is connected to the anodes of photodiodes PD1, PD3 at both ends and an amplifier A2 outputting a voltage V2 is similarly connected to the anode of the PD2 in the center. A comparator C outputting a scanning timing signal V0 by comparing the output voltage V1 with V2 is also connected. Using this circuit, the fluctuation in synchronization timing is eliminated even when the variation in light quantity is present, this synchronization timing is not affected by the influence of the sacanning direction of light beam and the synchronization detecting device unnecessitating the change of a logic circuit although the change is required previously.

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