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    • 3. 发明授权
    • Semiconductor laser drive device with an abnormal voltage protection
circuit
    • 半导体激光驱动装置具有异常的电压保护电路
    • US4745610A
    • 1988-05-17
    • US862770
    • 1986-05-13
    • Shozi Yoshikawa
    • Shozi Yoshikawa
    • H01S5/042H01S5/068H01S5/0683H01S3/00
    • H01S5/06825H01S5/0683
    • A plurality of supply voltages are supplied form a power supply to a semiconductor laser drive device. One of these supply voltages is applied to a discrimination circuit. The discrimination circuit includes a first zener diode, to which one of the supply voltages is applied, and which has a zener breakdown voltage corresponding to the lower limit of a threshold voltage range, and a second zener diode, to which the same supply voltage is applied, and which has a zener breakdown voltage corresponding to the upper limit of the threshold voltage range. First and second light-emitting diodes are connected in series with the respective first and second zener diodes. Light emitted from the first and second light-emitting diodes is received by respective first and second phototransistors connected in series between a voltage supply terminal and a ground terminal. A resistor is connected in parallel with the second phototransistor connected to the ground terminal. Voltage at the connection point between the first and second phototransistors is applied to the gate of a junction field-effect transistor, which has its drain grounded and its source connected to a control terminal of a switch in parallel with and for shunting the semiconductor laser.
    • 多个电源电压从电源提供给半导体激光器驱动装置。 这些电源电压之一被施加到鉴别电路。 鉴别电路包括:第一齐纳二极管,其中施加一个电源电压,并且其具有对应于阈值电压范围的下限的齐纳击穿电压;以及第二齐纳二极管,相同的电源电压为 并且具有对应于阈值电压范围的上限的齐纳击穿电压。 第一和第二发光二极管与相应的第一和第二齐纳二极管串联连接。 从第一和第二发光二极管发射的光由电压源端子和接地端子串联连接的相应的第一和第二光电晶体管接收。 电阻与连接到接地端子的第二光电晶体管并联连接。 在第一和第二光电晶体管之间的连接点处的电压被施加到结型场效应晶体管的栅极,该场效应晶体管的漏极接地,并且其源极连接到开关的控制端子并联并用于分流半导体激光器。
    • 4. 发明授权
    • Stabilized laser device of optical information recording/reproduction
apparatus
    • 光信息记录/再现装置的稳定激光装置
    • US4718068A
    • 1988-01-05
    • US814616
    • 1985-12-30
    • Shozi Yoshikawa
    • Shozi Yoshikawa
    • G06K7/10G11B7/125G11B7/126G11B19/02H01S3/13
    • G11B7/126G11B19/02
    • In a stabilized laser device of an optical recording/reproduction apparatus, in the reproduction mode, a laser beam of reproduction level is radiated on an optical disk, and data is read from the disk in the form of the light reflected from the disk. In the recording mode, a laser beam of the recording level (several times higher than the reproduction level) is radiated on the disk to form pits in the disk surface. The device has a semiconductor laser, a reference voltage generation source for generating reference values of the reproduction and recording levels, and a photodiode for photoelectrically converting laser light from the semiconductor laser so as to generate a detection signal a source of drive signals is provided for generating a first drive signal corresponding to the difference between the reference value of the recording level and the detection signal from the photodiode, and a second drive signal corresponding to the difference between the sum of reference values of the recording and reproduction levels and the detection signal from the photodiode. A switch supplies, in the reproduction mode, the first drive signal to the semiconductor laser and, in the recording mode, supplies one of the first drive signal and the sum of first and second drive signals in accordance with recording data.
    • 在光记录/再现装置的稳定的激光装置中,在再现模式中,将再现电平的激光束照射在光盘上,并以从盘反射的光的形式从盘读取数据。 在记录模式中,将记录电平的激光束(比再现电平高几倍)辐射到盘上以在盘表面中形成凹坑。 该器件具有半导体激光器,用于产生再现和记录电平的参考值的参考电压产生源,以及用于光电转换来自半导体激光器的激光的光电二极管,以产生一个驱动信号源的检测信号,用于 产生与记录电平的参考值和来自光电二极管的检测信号之间的差对应的第一驱动信号,以及对应于记录和再现电平的参考值之和与检测信号之间的差的第二驱动信号 从光电二极管。 开关在再现模式中向半导体激光器提供第一驱动信号,并且在记录模式下,根据记录数据提供第一驱动信号中的一个和第一和第二驱动信号之和。
    • 5. 发明授权
    • Semiconductor laser driver
    • 半导体激光驱动器
    • US4713819A
    • 1987-12-15
    • US863698
    • 1986-05-15
    • Shozi Yoshikawa
    • Shozi Yoshikawa
    • H01S5/042G01R31/26H01S3/10
    • G01R31/2635
    • A laser beam emitted from a semiconductor laser is detected by a PIN type photodiode. A forward bias source or a reverse bias source is coupled to the photodiode through a switch. When a power source is turned on, the switch is switched to connect the forward bias source to the photodiode. A forward bias current is applied to the photodiode. At this time, a driver circuit has not yet been supplying a drive current to the semiconductor laser. With a forward bias current applied, a forward voltage drop is generated across the photodiode. A discrimination circuit compares the forward voltage drop to a reference voltage range. When the forward voltage drop is outside the range, it is determined that the photodiode is abnormal, and the driver circuit is controlled such that no drive current is supplied to the semiconductor laser. When the forward voltage drop is in the reference voltage range, the operation of the driver circuit is started, and the switch is switched to connect the reverse bias source to the photodiode. Therefore, the semiconductor laser is caused to effect intensity modulation oscillation according to an externally supplied modulation signal. The photodiode supplies a photoelectric conversion signal corresponding to the quantity of received light to an APC circuit, so that the output of the semiconductor laser is controlled for stabilization.
    • 通过PIN型光电二极管检测从半导体激光器发射的激光束。 正向偏置源或反向偏压源通过开关耦合到光电二极管。 当电源接通时,切换开关将正向偏置源连接到光电二极管。 正向偏置电流施加到光电二极管。 此时,驱动电路还没有向半导体激光器提供驱动电流。 当施加正向偏置电流时,跨越光电二极管产生正向压降。 鉴别电路将正向压降与参考电压范围进行比较。 当正向压降在该范围之外时,确定光电二极管异常,并且控制驱动电路使得不向半导体激光器提供驱动电流。 当正向压降在参考电压范围内时,开始驱动电路的工作,并切换开关将反向偏压源连接到光电二极管。 因此,根据外部提供的调制信号,使半导体激光器实现强度调制振荡。 光电二极管将对应于接收光量的光电转换信号提供给APC电路,从而控制半导体激光器的输出以实现稳定。
    • 6. 发明授权
    • Stabilized laser apparatus
    • 稳定激光设备
    • US4734914A
    • 1988-03-29
    • US835557
    • 1986-03-03
    • Shozi Yoshikawa
    • Shozi Yoshikawa
    • G11B7/00G06K15/12G11B7/004G11B7/125H01S5/068H01S5/0683H01S3/00G01J1/32G02F1/00H01S3/04
    • G06K15/1214H01S5/0683H01S5/06804H01S5/06825H01S5/06832
    • A stabilized laser apparatus includes a semiconductor laser, a photodetector for detecting an output laser beam from the semiconductor laser, a differential amplifier for comparing the laser detection signal with a first or second reference signal, a window comparator for comparing a threshold range with an output from the differential amplifier, an up/down counter operated in response to an output from the window comparator, and a driving circuit for supplying a drive current to the semiconductor laser in accordance with a count of the up/down counter. A servo loop from the photodetector to the up/down counter is operated in response to an operation instruction signal or an adjustment instruction signal. The drive current is adjusted to coincide with a reference value before operation, and the adjusted drive current is stored in the up/down counter.
    • 一种稳定的激光装置包括半导体激光器,用于检测来自半导体激光器的输出激光束的光电检测器,用于将激光检测信号与第一或第二参考信号进行比较的差分放大器,用于将阈值范围与输出 来自差分放大器,响应于来自窗口比较器的输出而操作的上/下计数器,以及用于根据上/下计数器的计数向半导体激光器提供驱动电流的驱动电路。 响应于操作指令信号或调整指令信号,操作从光电检测器到升/降计数器的伺服环路。 驱动电流被调整为与操作之前的参考值一致,并且调节的驱动电流被存储在升/降计数器中。
    • 9. 发明授权
    • Stabilized laser device
    • 稳定激光装置
    • US4745609A
    • 1988-05-17
    • US814613
    • 1985-12-30
    • Shozi Yoshikawa
    • Shozi Yoshikawa
    • G11B7/00G11B7/005G11B7/125H01S5/0683H01S3/13
    • G11B7/126H01S5/0683
    • A stabilized laser device has a semiconductor laser, an optical detector for performing photoelectrical conversion of laser light from the laser and producing a detection signal, and a variable voltage power source for outputting an analog voltage signal as a preset value for the laser output light. A differential amplifier produces a differential signal representing the difference between the detection signal and the preset analog voltage signal, and a gate circuit supplies a clock pulse from a clock pulse generator to one of the up and down terminals of an up/down counter in accordance with the output signal from the differential amplifier. A D/A converter converts the output digital signal from the counter to an analog signal and supplies it to a driver circuit for the laser. The D/A converter generates an analog signal which corresponds to the product of the output digital signal from the counter and the preset analog voltage signal from the variable voltage power source.
    • 稳定的激光装置具有半导体激光器,用于对来自激光器的激光进行光电转换并产生检测信号的光学检测器,以及用于输出模拟电压信号作为激光输出光的预设值的可变电压电源。 差分放大器产生表示检测信号和预设模拟电压信号之间的差的差分信号,门电路根据时钟脉冲发生器向上/下计数器的上下端中的一个提供时钟脉冲 来自差分放大器的输出信号。 D / A转换器将来自计数器的输出数字信号转换为模拟信号,并将其提供给激光器的驱动电路。 D / A转换器产生对应于来自计数器的输出数字信号与来自可变电压电源的预设模拟电压信号的乘积的模拟信号。