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    • 4. 发明申请
    • Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method
    • 半导体激光驱动装置,光写入装置,成像装置和半导体激光驱动方法
    • US20040188717A1
    • 2004-09-30
    • US10757390
    • 2004-01-15
    • Kenichi Ono
    • H01L031/072
    • H01S5/042B41J2/471H01S3/0912H01S5/0427H01S5/06808H01S5/0683
    • A semiconductor laser drive apparatus and method are disclosed in order to obtain an optimal laser emission pulse that can reduce inherent light emission that may cause fogging and degradation of a photoconductor and also reduce turn on delay. Specifically, a light emission command signal is delayed at a delay unit based on a delay control signal so that a modulation signal is output. The light emission command signal and the delay signal are logically added to a command signal from an external source at a threshold signal generation unit so that a threshold ON signal is output. The modulation signal and the threshold ON signal respectively drive a modulation current switch and a threshold current switch so that a semiconductor laser drive current is generated. The threshold current is sampled according to a sample hold signal supplied from an external source and APC is performed on the sampled threshold current. In a differential quantum efficiency detection unit, an operation of determining differential quantum efficiency based on a current for obtaining a predetermined amount of light and a current for obtaining a portion of the predetermined amount of light is performed, and a light emission current is calculated. By adding the calculated light emission current and an arbitrary current that may be externally set, a modulation current for switching the semiconductor laser can be obtained.
    • 公开了一种半导体激光器驱动装置和方法,以获得可以减少可能导致光电导体的起雾和劣化的固有光发射的最佳激光发射脉冲,并且还减少导通延迟。 具体地,发光指令信号基于延迟控制信号以延迟单元被延迟,从而输出调制信号。 光发射指令信号和延迟信号在阈值信号产生单元上从外部源逻辑地加到指令信号上,从而输出阈值ON信号。 调制信号和阈值ON信号分别驱动调制电流开关和阈值电流开关,从而产生半导体激光器驱动电流。 根据从外部源提供的采样保持信号对阈值电流进行采样,并对采样的阈值电流执行APC。 在差分量子效率检测单元中,执行基于用于获得预定量的光的电流和用于获得预定量的光的一部分的电流来确定差分量子效率的操作,并且计算发光电流。 通过添加计算出的发光电流和可以从外部设定的任意电流,可以获得用于切换半导体激光器的调制电流。
    • 8. 发明申请
    • Semiconductor device
    • 半导体器件
    • US20040169194A1
    • 2004-09-02
    • US10737864
    • 2003-12-18
    • KABUSHIKI KAISHA TOSHIBA
    • Takao Noda
    • H01L031/072
    • H01L29/7785H01L29/201H01L29/205
    • A semiconductor device comprises: a GaAs substrate; a buffer layer provided on the GaAs substrate; a laminated structure provided on the buffer layer; a Schottky contact layer provided on the laminated structure; a n-type Inx(Ga1nullyAly)1nullxP layer provided on the Schottky contact layer; a n-type Inu2Ga1nullu2As ohmic contact layer provided on the n-type Inx(Ga1nullyAly)1nullP layer; a gate electrode provided on the Schottky contact layer; and a source electrode and a drain electrode provided on the ohmic contact layer. The buffer layer is made of a semiconductor, and at least a part of the semiconductor has a lattice constant larger than a lattice constant of GaAs. The channel layer is made of Inu1Ga1nullu1As, and the electron supply layer is made of n-type Inv1Al1nullv1As. At least a part of the Schottky contact layer is made of non-doped Inv2Al1nullv2As. The Inx(Ga1nullyAly)1nullxP layer has a part where a bandgap has a distribution which shows a gradual or a stepwise decrease from the Schottky contact layer toward the ohmic contact layer.
    • 一种半导体器件包括:GaAs衬底; 设置在GaAs衬底上的缓冲层; 设置在缓冲层上的叠层结构; 设置在层叠结构上的肖特基接触层; 设置在肖特基接触层上的n型Inx(Ga1-yAly)1-xP层; 设置在n型Inx(Ga1-yAly)1-P层上的n型Inu2Ga1-u2As欧姆接触层; 设置在所述肖特基接触层上的栅电极; 以及设置在欧姆接触层上的源电极和漏电极。 缓冲层由半导体制成,半导体的至少一部分具有大于GaAs晶格常数的晶格常数。 沟道层由Inu1Ga1-u1As制成,电子供给层由n型Inv1Al1-v1A制成。 肖特基接触层的至少一部分由非掺杂的Inv2Al1-v2A制成。 Inx(Ga1-yAly)1-xP层具有带隙具有从肖特基接触层朝向欧姆接触层逐渐或逐步降低的分布的部分。