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    • 1. 发明申请
    • SEMICONDUCTOR LASER DRIVE APPARATUS AND IMAGE FORMING APPARATUS
    • 半导体激光驱动装置和图像形成装置
    • US20140341243A1
    • 2014-11-20
    • US14273839
    • 2014-05-09
    • Daijiro SuminoTakao Watanabe
    • Daijiro SuminoTakao Watanabe
    • H01S5/02
    • H01S5/0683H01S5/042H01S5/4025
    • A semiconductor laser drive apparatus includes: a current setting circuit that stores a first set value for a light-emission current obtained by subtracting a first bias current used when the semiconductor laser element emits light, from a drive current used when the semiconductor laser element emits light, a second set value for the first bias current, and a third set value for a second bias current used when the semiconductor laser element does not emit light; a first current generator circuit that generates a first input current from the first set value; a second current generator circuit that generates a second input current from the second set value and a third input current from the third set value; and a switching circuit that supplies a sum of the first and second input currents to a drive circuit when a light-emission control signal is on, and the third input current to the drive circuit when the light-emission control signal is off.
    • 半导体激光器驱动装置包括:电流设定电路,存储当半导体激光元件发射时使用的驱动电流,减去半导体激光元件发光时使用的第一偏置电流而获得的发光电流的第一设定值 光,第一偏置电流的第二设定值和当半导体激光元件不发光时使用的第二偏置电流的第三设定值; 第一电流发生器电路,其从所述第一设定值产生第一输入电流; 从所述第二设定值产生第二输入电流的第二电流发生电路和来自所述第三设定值的第三输入电流; 以及开关电路,当发光控制信号为开时,将第一和第二输入电流的和提供给驱动电路,并且当发光控制信号关闭时,向驱动电路提供第三输入电流。
    • 2. 发明授权
    • Semiconductor laser drive apparatus and image forming apparatus
    • 半导体激光驱动装置及图像形成装置
    • US09130341B2
    • 2015-09-08
    • US14273839
    • 2014-05-09
    • Daijiro SuminoTakao Watanabe
    • Daijiro SuminoTakao Watanabe
    • H01S5/0683H01S5/042H01S5/40
    • H01S5/0683H01S5/042H01S5/4025
    • A semiconductor laser drive apparatus includes: a current setting circuit that stores a first set value for a light-emission current obtained by subtracting a first bias current used when the semiconductor laser element emits light, from a drive current used when the semiconductor laser element emits light, a second set value for the first bias current, and a third set value for a second bias current used when the semiconductor laser element does not emit light; a first current generator circuit that generates a first input current from the first set value; a second current generator circuit that generates a second input current from the second set value and a third input current from the third set value; and a switching circuit that supplies a sum of the first and second input currents to a drive circuit when a light-emission control signal is on, and the third input current to the drive circuit when the light-emission control signal is off.
    • 半导体激光器驱动装置包括:电流设定电路,存储当半导体激光元件发射时使用的驱动电流,减去半导体激光元件发光时使用的第一偏置电流而获得的发光电流的第一设定值 光,第一偏置电流的第二设定值和当半导体激光元件不发光时使用的第二偏置电流的第三设定值; 第一电流发生器电路,其从所述第一设定值产生第一输入电流; 从所述第二设定值产生第二输入电流的第二电流发生电路和来自所述第三设定值的第三输入电流; 以及开关电路,当发光控制信号为开时,将第一和第二输入电流的和提供给驱动电路,并且当发光控制信号关闭时,向驱动电路提供第三输入电流。