公开(公告)号：US06917639B2

公开(公告)日：2005-07-12

申请号：US10214559

申请日：2002-08-09

申请人： Masaaki Ishida ,  Hidetoshi Ema ,  Yasuhiro Nihei ,  Hiroaki Kyougoku ,  Atsufumi Omori

发明人： Masaaki Ishida ,  Hidetoshi Ema ,  Yasuhiro Nihei ,  Hiroaki Kyougoku ,  Atsufumi Omori

IPC分类号： H01S5/042 ,  H01S5/0683 ,  H01S3/00 ,  H01S3/13

CPC分类号： H01S5/042 ,  H01S5/0427 ,  H01S5/0683

摘要： A laser driver circuit includes a biasing current source, a threshold current source, and a modulation current source, wherein the threshold current source produces a threshold current in response to an input signal with an interval exceeding an interval of a modulation current such that said interval of the threshold current includes the interval of said modulation current. The laser driver circuit drives the laser diode by a sum of a continuous bias current, the threshold current and the modulation current.

摘要翻译： 激光驱动器电路包括偏置电流源，阈值电流源和调制电流源，其中阈值电流源响应输入信号产生阈值电流，间隔超过调制电流的间隔，使得所述间隔 阈值电流包括所述调制电流的间隔。 激光驱动电路通过连续偏置电流，阈值电流和调制电流的和来驱动激光二极管。

公开(公告)号：US06791596B2

公开(公告)日：2004-09-14

申请号：US10183748

申请日：2002-06-28

申请人： Yasuhiro Nihei ,  Hidetoshi Ema ,  Masaaki Ishida ,  Akihisa Itabashi

发明人： Yasuhiro Nihei ,  Hidetoshi Ema ,  Masaaki Ishida ,  Akihisa Itabashi

IPC分类号： B41J2435

CPC分类号： G06K15/1219

摘要： A pixel clock pulse generating apparatus for use in an image forming apparatus includes high frequency clock pulse and pixel clock pulse generators. The high frequency clock pulse generator generates relatively high frequency clock pulses. The pixel clock pulse generator generates pixel clock pulses based on the phase data for instructing a transition time of pixel clock pulses and the high frequency clock pulses.

摘要翻译： 用于图像形成装置的像素时钟脉冲产生装置包括高频时钟脉冲和像素时钟脉冲发生器。 高频时钟脉冲发生器产生相对较高频率的时钟脉冲。 像素时钟脉冲发生器基于用于指示像素时钟脉冲和高频时钟脉冲的转换时间的相位数据产生像素时钟脉冲。

公开(公告)号：US06731317B2

公开(公告)日：2004-05-04

申请号：US10095913

申请日：2002-03-13

申请人： Hidetoshi Ema ,  Masaaki Ishida ,  Yasuhiro Nihei

发明人： Hidetoshi Ema ,  Masaaki Ishida ,  Yasuhiro Nihei

IPC分类号： B41J2385

CPC分类号： H04N1/40037 ,  H04N1/4056

摘要： A clock generating part generates a high-frequency clock signal having a frequency higher than that of a pixel clock frequency; a serial modulation signal generating part generates a serial modulation signal having a serial pulse sequence based on the high-frequency clock signal, and, light emission is modulated according to the serial modulation signal, and, thus, each pixel of an image is formed according at the pixel clock frequency.

摘要翻译： 时钟产生部分产生具有比像素时钟频率高的频率的高频时钟信号; 串行调制信号产生部分产生具有基于高频时钟信号的串行脉冲序列的串行调制信号，根据串行调制信号调制发光，因此，根据 在像素时钟频率。

公开(公告)号：US06498617B1

公开(公告)日：2002-12-24

申请号：US09689790

申请日：2000-10-13

申请人： Masaaki Ishida ,  Hidetoshi Ema

发明人： Masaaki Ishida ,  Hidetoshi Ema

IPC分类号： B41J247

CPC分类号： G06K15/1209

摘要： A pulse width modulation circuit is provided with a signal generating circuit generating a reference clock signal and a predetermined signal which is approximately inversely proportional to a digital data input signal, a delay quantity generating circuit delaying the reference clock signal by a desired phase delay to output a pulse signal, based on the predetermined signal from the signal generating circuit, a delay quantity controller controlling a delay quantity of the delay quantity generating circuit, and a modulated signal generator generating a modulated signal which is pulse-width-modulated based on the pulse signal from the delay quantity generating circuit and the reference clock signal.

摘要翻译： 脉冲宽度调制电路具有产生参考时钟信号和大致与数字数据输入信号成反比的预定信号的信号发生电路，延迟量产生电路将参考时钟信号延迟所需相位延迟以输出 基于来自信号发生电路的预定信号的脉冲信号，控制延迟量产生电路的延迟量的延迟量控制器，以及调制信号发生器，其生成基于脉冲进行脉宽调制的调制信号 来自延迟量产生电路的信号和参考时钟信号。

公开(公告)号：US5237579A

公开(公告)日：1993-08-17

申请号：US824015

申请日：1992-01-22

申请人： Hidetoshi Ema ,  Masaaki Ishida

发明人： Hidetoshi Ema ,  Masaaki Ishida

IPC分类号： H01S5/0683

CPC分类号： H01S5/0683

摘要： A semiconductor laser controller which controls an optical output of a semiconductor laser by using an optical-electronic negative feedback. At least two pairs of bipolar transistors are used for the optical-electronic negative feedback. The transistors are configured so that a time constant of the semiconductor laser controller can be improved by the small emitter-resistance of the transistors. Thus, a gain of the optical-electronic negative feedback can be varied without deteriorating a control speed.

摘要翻译： 一种半导体激光控制器，其通过使用光电子负反馈来控制半导体激光器的光输出。 至少两对双极晶体管用于光电子负反馈。 晶体管被配置为使得可以通过晶体管的小的发射极电阻来提高半导体激光器控制器的时间常数。 因此，可以在不降低控制速度的情况下改变光电子负反馈的增益。

公开(公告)号：US6118798A

公开(公告)日：2000-09-12

申请号：US272197

申请日：1999-03-18

申请人： Hidetoshi Ema ,  Masaaki Ishida ,  Naruhiro Masui

发明人： Hidetoshi Ema ,  Masaaki Ishida ,  Naruhiro Masui

IPC分类号： H01S5/042 ,  H01S5/0683 ,  H01S3/10

CPC分类号： H01S5/06835 ,  H01S5/042 ,  H01S5/0428

摘要： A pulse width modulation and intensity modulation signal generating unit, based on input data, performs pulse width modulation and intensity modulation and generates a light emission instruction signal. An error amplifier forms a negative feedback loop together with a semiconductor laser and a light reception device which monitors light output of the semiconductor laser, the error amplifier controlling forward current of the semiconductor laser so that a light reception signal proportional to the light output of the semiconductor laser is equal to the light emission instruction signal. A current driving unit causes a driving current, according to the light emission instruction signal, to flow through the semiconductor laser as the forward current thereof, the driving current being generated so as to control driving of the semiconductor laser with a current of the difference or sum with the control current of the negative feedback loop. The pulse width modulation nd intensity modulation signal generating unit, the error amplifier and the current driving unit are formed as one chip of an integrated circuit.

摘要翻译： 脉冲宽度调制和强度调制信号产生单元基于输入数据进行脉冲宽度调制和强度调制，并产生发光指示信号。 误差放大器与半导体激光器和监视半导体激光器的光输出的光接收装置一起形成负反馈回路，误差放大器控制半导体激光器的正向电流，使得与光输出成比例的光接收信号 半导体激光器等于发光指示信号。 电流驱动单元使得根据发光指示信号的驱动电流作为其正向电流流过半导体激光器，产生驱动电流以便以不同的电流控制半导体激光器的驱动，或者 与负反馈回路的控制电流相加。 脉冲宽度调制和强度调制信号发生单元，误差放大器和电流驱动单元形成为集成电路的一个芯片。

公开(公告)号：US5946334A

公开(公告)日：1999-08-31

申请号：US825300

申请日：1997-03-27

申请人： Hidetoshi Ema ,  Masaaki Ishida ,  Naruhiro Masui

发明人： Hidetoshi Ema ,  Masaaki Ishida ,  Naruhiro Masui

IPC分类号： H01S5/042 ,  H01S5/0683 ,  H01S3/10

CPC分类号： H01S5/06835 ,  H01S5/042 ,  H01S5/0428

摘要： A pulse width modulation and intensity modulation signal generating unit, based on input data, performs pulse width modulation and intensity modulation and generates a light emission instruction signal. An error amplifier forms a negative feedback loop together with a semiconductor laser and a light reception device which monitors light output of the semiconductor laser, the error amplifier controlling forward current of the semiconductor laser so that a light reception signal proportional to the light output of the semiconductor laser is equal to the light emission instruction signal. A current driving unit causes a driving current, according to the light emission instruction signal, to flow through the semiconductor laser as the forward current thereof, the driving current being generated so as to control driving of the semiconductor laser with a current of the difference or sum with the control current of the negative feedback loop. The pulse width modulation and intensity modulation signal generating unit, the error amplifier and the current driving unit are formed as one chip of an integrated circuit.

摘要翻译： 脉冲宽度调制和强度调制信号产生单元基于输入数据进行脉冲宽度调制和强度调制，并产生发光指示信号。 误差放大器与半导体激光器和监视半导体激光器的光输出的光接收装置一起形成负反馈回路，误差放大器控制半导体激光器的正向电流，使得与光输出成比例的光接收信号 半导体激光器等于发光指示信号。 电流驱动单元使得根据发光指示信号的驱动电流作为其正向电流流过半导体激光器，产生驱动电流，以便以不同的电流控制半导体激光器的驱动，或 与负反馈回路的控制电流相加。 脉冲宽度调制和强度调制信号产生单元，误差放大器和电流驱动单元形成为集成电路的一个芯片。

公开(公告)号：US5784091A

公开(公告)日：1998-07-21

申请号：US862326

申请日：1997-05-23

申请人： Hidetoshi Ema ,  Masaaki Ishida

发明人： Hidetoshi Ema ,  Masaaki Ishida

IPC分类号： B41J2/44 ,  G02F3/00 ,  G06K15/12 ,  H01S5/042 ,  H01S5/068 ,  H04N1/40 ,  B41J2/385 ,  G03G13/04 ,  H04N1/21

CPC分类号： G06K15/1209 ,  H04N1/40037 ,  H04N1/40043

摘要： A digital ASIC inputs pixel data thereto and an analog ASIC inputs the output signal of the digital ASIC thereto. A combination of the digital ASIC and the analog ASIC controls a semiconductor laser so as to pulse-width-modulate and amplitude-modulate the light emitted by the semiconductor laser that may be pulse-width-modulated and amplitude-modulated. The digital ASIC comprises a reference pulse generator having delay time control unit and a pulse width generator for generating a plurality of different pulse widths using pulses having a plurality of phases generated by the reference pulse generator. The analog ASIC comprises control/modulation unit for controlling the semiconductor laser so as to pulse-width-modulate and amplitude-modulate the light emitted by the semiconductor laser using the plurality of different pulse widths generated by the pulse width generator. The reference pulse generator comprises an oscillator comprising combined multiple delay-time control unit, and control unit for controlling the oscillator so as to make the frequency supplied by the oscillator identical to the clock of the pixel data.

摘要翻译： 数字ASIC输入像素数据，模拟ASIC输入数字ASIC的输出信号。 数字ASIC和模拟ASIC的组合控制半导体激光器，以对脉冲宽度调制和幅度调制的半导体激光器发射的光进行脉宽调制和幅度调制。 数字ASIC包括具有延迟时间控制单元的参考脉冲发生器和脉冲宽度发生器，用于使用具有由参考脉冲发生器产生的多个相位的脉冲来产生多个不同的脉冲宽度。 模拟ASIC包括用于控制半导体激光器的控制/调制单元，以便利用由脉冲宽度发生器产生的多个不同的脉冲宽度来对半导体激光器发射的光进行脉宽调制和幅度调制。 参考脉冲发生器包括一个振荡器，它包括组合的多个延迟时间控制单元，以及控制单元，用于控制振荡器，以使由振荡器提供的频率与像素数据的时钟相同。

公开(公告)号：US5138623A

公开(公告)日：1992-08-11

申请号：US663158

申请日：1991-03-01

申请人： Hidetoshi Ema ,  Masaaki Ishida

发明人： Hidetoshi Ema ,  Masaaki Ishida

IPC分类号： H01S5/042 ,  H01S5/0683

CPC分类号： H01S5/0683 ,  H01S5/042

摘要： A semiconductor laser control device that comprises a light receiving photodiode for detecting light emitted from a semiconductor laser element to be controlled and a current amplifier circuit. To the amplifier circuit, the light receiving photodiode and a light emitting command signal are connected so as to apply first forward current to the laser element in response to difference between the light detection signal and an input signal corresponding to the light emitting command signal so that a negative feed back circuit is constituted from the light receiving photodiode and the amplifier circuit. The device further comprises a current applying circuit for applying second forward current to the laser element in conjunction with said first forward current and a correction circuit for correcting the second forward current.

摘要翻译： 一种半导体激光器控制装置，包括用于检测从要被控制的半导体激光元件发射的光的光接收光电二极管和电流放大器电路。 对于放大器电路，光接收光电二极管和发光指令信号被连接，以响应于光检测信号和对应于发光指令信号的输入信号之间的差异，向激光元件施加第一正向电流，使得 负反馈电路由光接收光电二极管和放大电路构成。 该装置还包括电流施加电路，用于结合所述第一正向电流向激光元件施加第二正向电流，以及用于校正第二正向电流的校正电路。

公开(公告)号：US5258780A

公开(公告)日：1993-11-02

申请号：US694906

申请日：1991-05-02

申请人： Hidetoshi Ema ,  Hitoshi Hattori ,  Masaaki Ishida ,  Susumu Imakawa ,  Yoshinobu Takeyama

发明人： Hidetoshi Ema ,  Hitoshi Hattori ,  Masaaki Ishida ,  Susumu Imakawa ,  Yoshinobu Takeyama

IPC分类号： H04N1/40 ,  H04N1/405 ,  H04N1/21

CPC分类号： H04N1/40031 ,  H04N1/40043 ,  H04N1/4055

摘要： An image forming apparatus includes a semiconductor laser unit for emitting a laser beam, a photosensitive drum which rotates in a first direction, a scanning optical system for making the laser beam scan the photosensitive drum in a second direction perpendicular to the first direction, wherein an electrophotography process is carried out on the surface of the photosensitive drum, a data generator for generating intensity data for each dot in an image in accordance with image information supplied from an external controller, and a laser driver for outputting a driving signal which drives the semiconductor laser unit, the driving signal having a pulse width and a level for each dot in an image, the pulse width being a predetermined value less than a value corresponding to an interval between adjacent dots formed in a direction parallel to the first direction, and the level corresponding to the intensity data generated by the data generator.

摘要翻译： 图像形成装置包括用于发射激光束的半导体激光器单元，沿第一方向旋转的感光鼓，用于使激光束沿与第一方向垂直的第二方向扫描感光鼓的扫描光学系统，其中， 在感光鼓的表面上执行电子照相处理，数据发生器，用于根据从外部控制器提供的图像信息产生图像中的每个点的强度数据;以及激光驱动器，用于输出驱动半导体的驱动信号 激光单元，所述驱动信号具有图像中的每个点的脉冲宽度和电平，所述脉冲宽度是小于对应于在与所述第一方向平行的方向上形成的相邻点之间的间隔的值的预定值，以及 水平对应于由数据发生器产生的强度数据。