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1. 发明授权

US4748605A Bias-magnetic-field generating apparatus in magneto-optical information writing and erasing system 失效
标题翻译：磁光信息写入和擦除系统中的偏磁场产生装置
公开(公告)号：US4748605A
公开(公告)日：1988-05-31
申请号：US780662
申请日：1985-09-26
申请人： Mitsugu Sakai , Shozi Yoshikawa
发明人： Mitsugu Sakai , Shozi Yoshikawa
IPC分类号： G11B11/10 , G11B11/105 , G11B20/10 , G11B5/02 , G11B11/00
CPC分类号： G11B11/10595 , G11B11/10508
摘要： A magneto-optical information system writes and erases information on and from a magneto-optical information recording medium under application of a bias-magnetic-field to the recording medium according to writing and erasing command signals. A differential amplifying circuit differentially processes the writing and erasing command signals to produce a differential output signal, and a constant current power amplifying circuit produces a stable drive current according to the differential output signal. A bias-magnetic-field generating coil is driven by the stable drive current so that a stable bias-magnetic-field is applied to the information recording medium according to the differential output signal.
摘要翻译：磁光信息系统根据写入和擦除命令信号，在施加偏磁场的情况下，向磁光信息记录介质写入信息，并将其从擦除信息记录到记录介质上。差分放大电路对写入和擦除命令信号进行差分处理以产生差分输出信号，并且恒流功率放大电路根据差分输出信号产生稳定的驱动电流。偏置磁场产生线圈由稳定的驱动电流驱动，使得根据差分输出信号将稳定的偏置磁场施加到信息记录介质。

2. 发明授权

US4745588A Tracking control apparatus 失效
标题翻译：跟踪控制装置
公开(公告)号：US4745588A
公开(公告)日：1988-05-17
申请号：US849053
申请日：1986-04-07
申请人： Shozi Yoshikawa , Masanori Doi
发明人： Shozi Yoshikawa , Masanori Doi
IPC分类号： G11B7/095 , G11B19/00 , G11B21/10 , G11B17/00 , G11B7/00
CPC分类号： G11B7/0953 , G11B19/00 , G11B21/10
摘要： An apparatus for controlling the tracking of an optical disk by moving an objective lens and a carriage supporting the objective lens. The apparatus comprises a lens tracking mechanism comprising an actuator and a lens tracking circuit, and an equivalent circuit having the same response characteristic as the lens tracking mechanism. The lens tracking mechanism moves the lens in real time in the radial direction of the disk in accordance with a tracking error signal representing the distance between a laser beam spot and a target track. The carriage is moved also in the radial direction of the disk in accordance with a sine-wave signal approximating the eccentricity of the disk. The eccentricity has been detected from the distance over which the lens is moved when the carriage is not moved. This distance is not detected by measuring, but obtained from the output signal which the equivalent circuit generates in response to the tracking error signal.
摘要翻译：一种用于通过移动物镜和支撑物镜的滑架来控制光盘的跟踪的装置。该装置包括透镜跟踪机构，其包括致动器和透镜跟踪电路，以及具有与透镜跟踪机构相同的响应特性的等效电路。透镜跟踪机构根据表示激光束光点与目标光道之间的距离的跟踪误差信号，在盘的径向方向上实时移动透镜。根据接近盘的偏心度的正弦波信号，托架也沿盘的径向移动。当托架未移动时，透镜移动距离已经检测出偏心度。该距离不是通过测量来检测的，而是从等效电路响应于跟踪误差信号产生的输出信号获得的。

3. 发明授权

US4745609A Stabilized laser device 失效
标题翻译：稳定激光装置
公开(公告)号：US4745609A
公开(公告)日：1988-05-17
申请号：US814613
申请日：1985-12-30
申请人： Shozi Yoshikawa
发明人： Shozi Yoshikawa
IPC分类号： G11B7/00 , G11B7/005 , G11B7/125 , H01S5/0683 , H01S3/13
CPC分类号： G11B7/126 , H01S5/0683
摘要： 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.
摘要翻译：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。

4. 发明授权

US4728188A Light source degeradation detecting apparatus for laser device 失效
标题翻译：用于激光装置的光源去角度检测装置
公开(公告)号：US4728188A
公开(公告)日：1988-03-01
申请号：US839334
申请日：1986-03-13
申请人： Seizi Kitagawa , Shozi Yoshikawa , Haruhiko Takemura
发明人： Seizi Kitagawa , Shozi Yoshikawa , Haruhiko Takemura
IPC分类号： G11B7/125 , H01S5/06 , H01S5/068 , H01S5/0683 , G01J1/18
CPC分类号： H01S5/06825 , H01S5/0617 , H01S5/0683
摘要： A light source degradation detecting apparatus for a laser device monitors drive currents and output laser beams. The degradation detecting apparatus includes drivers for supplying three drive signals to the laser, a photodiode for detecting laser outputs produced in response to the drive signals, a memory for storing measured values and the drive signals, and a discriminator for calculating ratio P from storage data (laser outputs W.sub.n, W.sub.n+1, and W.sub.n+2 produced in response to drive currents I.sub.n, I.sub.n+1, and I.sub.n+2) as follows:P={(W.sub.n+2 -W.sub.n)/(I.sub.n+2 -I.sub.n)}/{(W.sub.n+1 -W.sub.n)/(I.sub.n+1 -I.sub.n)}and for discriminating that the laser has reached an end of its life when the ratio P falls outside a predetermined range.
摘要翻译：用于激光装置的光源劣化检测装置监视驱动电流并输出激光束。劣化检测装置包括用于向激光器提供三个驱动信号的驱动器，用于检测响应于驱动信号产生的激光输出的光电二极管，用于存储测量值的存储器和驱动信号，以及用于从存储数据计算比率P的鉴别器（激光输出Wn，Wn + 1和Wn + 2响应于驱动电流In，In + 1和In + 2而产生）如下：P = {（Wn + 2-Wn）/（In + 2-In ）} / {（Wn + 1-Wn）/（In + 1-In）}，并且用于鉴别当比率P在预定范围之外时激光已经达到其寿命的结束。

5. 发明授权

US4734914A Stabilized laser apparatus 失效
标题翻译：稳定激光设备
公开(公告)号：US4734914A
公开(公告)日：1988-03-29
申请号：US835557
申请日：1986-03-03
申请人： Shozi Yoshikawa
发明人： Shozi Yoshikawa
IPC分类号： G11B7/00 , G06K15/12 , G11B7/004 , G11B7/125 , H01S5/068 , H01S5/0683 , H01S3/00 , G01J1/32 , G02F1/00 , H01S3/04
CPC分类号： G06K15/1214 , H01S5/0683 , H01S5/06804 , H01S5/06825 , H01S5/06832
摘要： 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.
摘要翻译：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。

6. 发明授权

US4520280A Apparatus for detecting input signal 失效
标题翻译：用于检测输入信号的装置
公开(公告)号：US4520280A
公开(公告)日：1985-05-28
申请号：US406487
申请日：1982-08-09
申请人： Shozi Yoshikawa , Hiroshi Kodama , Ken Ohsima , Masaharu Sakamoto , Kiichi Kato , Kunio Yamamiya
发明人： Shozi Yoshikawa , Hiroshi Kodama , Ken Ohsima , Masaharu Sakamoto , Kiichi Kato , Kunio Yamamiya
IPC分类号： H03K5/08 , H03K5/153
CPC分类号： H03K5/082
摘要： An input signal containing a base line which fluctuates to a great extent is detected or restored by comparing the input signal with reference levels which are shifted in accordance with the fluctuation of base line. The input signal is sampled at a variable sampling rate and an average of sampled values for a predetermined period is derived to produce a profile signal which resembles accurately the fluctuation of the base line. The profile signal thus obtained is added to upper and lower threshold voltages to produce the reference levels which have been corrected in accordance with the fluctuation of the base line of input signal.
摘要翻译：通过将输入信号与根据基线的波动偏移的参考电平进行比较来检测或恢复包含大幅波动的基线的输入信号。以可变采样率对输入信号进行采样，得到预定周期的采样值的平均值，以产生类似于基线波动的分布信号。由此获得的轮廓信号被加到上限和下限阈值电压上，以产生已经根据输入信号的基线的波动校正的基准电平。

7. 发明授权

US4499572A Method for reading information or defect out of rotating disc 失效
标题翻译：用于读取信息或从旋转盘中缺陷的方法
公开(公告)号：US4499572A
公开(公告)日：1985-02-12
申请号：US402075
申请日：1982-07-26
申请人： Shozi Yoshikawa , Masaharu Sakamoto , Hiroshi Kodama , Kunio Yamamiya , Kiichi Kato , Ken Ohsima
发明人： Shozi Yoshikawa , Masaharu Sakamoto , Hiroshi Kodama , Kunio Yamamiya , Kiichi Kato , Ken Ohsima
IPC分类号： G11B5/012 , G01N21/95 , G11B7/0037 , G11B7/013 , G11B20/08 , G11B20/10 , G11B27/36 , G11B7/00
CPC分类号： G11B27/36 , G01N21/9506 , G11B20/08 , G11B20/10 , G11B7/00375 , G11B7/013
摘要： In order to read out information recorded on a disc rotating at a constant angular velocity by means of a pick-up head movably arranged in a disc radius direction, a head position on the disc is detected to obtain a position signal representing a distance from a disc center to the pick-up head, and then a pulse signal having a frequency corresponding to the position signal thus obtained is generated. A detection signal supplied from the pick-up head and the pulse signal are supplied to an AND gate and pulses of the gated out pulse signal are counted by a counter. The number of the counted pulses represents correctly a length of the information recorded on the disc irrespective of position of the information on the disc.
摘要翻译：为了通过可移动地以盘半径方向布置的拾取头读出记录在以恒定角速度旋转的盘上的信息，检测盘上的头位置以获得表示距离光盘中心到拾取头，然后产生具有与如此获得的位置信号相对应的频率的脉冲信号。从拾取头提供的检测信号和脉冲信号被提供给与门，门控脉冲信号的脉冲由计数器计数。计数脉冲的数量正好表示记录在盘上的信息的长度，而与盘上的信息的位置无关。

8. 发明授权

US4858219A Optical information recording reproducing memory system with both power control and optical irradiation inhibiting circuit 失效
标题翻译：具有功率控制和光照射抑制电路的光信息记录再现存储系统
公开(公告)号：US4858219A
公开(公告)日：1989-08-15
申请号：US169106
申请日：1988-03-09
申请人： Shozi Yoshikawa
发明人： Shozi Yoshikawa
IPC分类号： G11B7/0037 , G11B7/085 , G11B7/125 , G11B19/04
CPC分类号： G11B7/126 , G11B19/04 , G11B7/0037 , G11B7/08547
摘要： There is provided an optical information recording and reproducing system which comprises a light source, a light beam power compensation circuit which can compensate a fluctuation of an emitted light beam power from the light source in response to a detected monitor signal corresponding to a light flux from the light source, a light beam control circuit composed of at least one control loop which controls the light beam emitted from the light source and irradiates the same onto a data storing medium, and a light beam inhibit circuit which can inhibit irradiation of the light beam onto the data storing medium.
摘要翻译：提供了一种光信息记录和再现系统，其包括光源，光束功率补偿电路，其可以响应于对应于来自光源的光通量的检测到的监视信号来补偿来自光源的发射光束功率的波动光源，由至少一个控制环路组成的光束控制电路，控制环路控制从光源发射的光束并将其照射到数据存储介质上;以及光束禁止电路，其能够抑制光束的照射到数据存储介质上。

9. 发明授权

US4745610A Semiconductor laser drive device with an abnormal voltage protection circuit 失效
标题翻译：半导体激光驱动装置具有异常的电压保护电路
公开(公告)号：US4745610A
公开(公告)日：1988-05-17
申请号：US862770
申请日：1986-05-13
申请人： Shozi Yoshikawa
发明人： Shozi Yoshikawa
IPC分类号： H01S5/042 , H01S5/068 , H01S5/0683 , H01S3/00
CPC分类号： H01S5/06825 , H01S5/0683
摘要： 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.
摘要翻译：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。

10. 发明授权

US4718068A Stabilized laser device of optical information recording/reproduction apparatus 失效
标题翻译：光信息记录/再现装置的稳定激光装置
公开(公告)号：US4718068A
公开(公告)日：1988-01-05
申请号：US814616
申请日：1985-12-30
申请人： Shozi Yoshikawa
发明人： Shozi Yoshikawa
IPC分类号： G06K7/10 , G11B7/125 , G11B7/126 , G11B19/02 , H01S3/13
CPC分类号： G11B7/126 , G11B19/02
摘要： 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.
摘要翻译：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。

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