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公开(公告)号：US5804814A
公开(公告)日：1998-09-08
申请号：US447208
申请日：1995-05-22
CPC分类号： G11B7/1356 , G02B27/283 , G02B5/3083 , G11B11/10543 , G11B7/123 , G11B7/22
摘要： An optical pick-up head for reading writing information from on a magneto-optical record medium including a semiconductor laser, a multi-image plane parallel plate for separating an incident light beam emitted by the semiconductor laser from a return light beam reflected by the optical record medium and dividing the return beam transmitted through and refracted by the multi-image plane parallel plate into a plurality of return light beams, and a signal detecting photodetector receiving a plurality of return light beams, wherein the multi-image plane parallel plate is formed by first and second prisms made of birefringent material and is arranged such that major and minor axes of astigmatism introduced by the plane parallel plate are inclined by 45.degree. with respect to an information track. An optic axis of the first prism is set such that the return beam is separated into ordinary and extraordinary light beams having identical intensities and an optic axis of the second prism is rotated with respect to the optic axis of the first prism. The optical elements are positioned and mounted on a mounting substrate having guide walls formed by a photolithography.
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2.发明授权
公开(公告)号：US4792227A
公开(公告)日：1988-12-20
申请号：US21286
申请日：1987-03-03
申请人： Akihiko Yoshizawa
发明人： Akihiko Yoshizawa
CPC分类号： G01N21/23 , G11B11/10582 , G11B7/26
摘要： An apparatus (31) and method for measuring the refractive index of an optical recording medium substrate (34) wherein an angle of incidence of a polarized beam (33) is set at an oblique angle of incidence with the substrate (34), the polarized direction of the polarized beam (33) is varied for the substrate (34) in this state, the transmitted or reflected light beam by the substrate is received by a light receiving means (36) through a light analyzer means (35) in the crossed Nichol state and the received light amount for the polarized angle is measured and is compared with a theoretical formula so that the refractive index in the thickness direction of the substrate can be measured.
摘要翻译： 一种用于测量光记录介质衬底（34）的折射率的装置（31）和方法，其中偏振光束（33）的入射角被设置为与衬底（34）成倾斜的入射角，偏振 在该状态下，偏振光束（33）的方向对于基板（34）而变化，基板的透射或反射光束被光接收装置（36）通过穿过的光分析器装置（35）接收 测量Nichol状态和接收到的偏振角的光量，并与理论公式进行比较，从而可以测量基板厚度方向的折射率。
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3.发明授权Voltage controlled oscillator including fluctuation transmitter for transmitting potential fluctuation by noise 失效压控振荡器包括用于传输噪声的电位波动的波动发射器公开(公告)号：US06611177B2
公开(公告)日：2003-08-26
申请号：US10003241
申请日：2001-12-06
IPC分类号： H03B504
CPC分类号： H03K3/03 , H03K3/011 , H03K3/013 , H03K3/0231 , H03K3/0322 , H03K5/133 , H03K2005/00039 , H03K2005/00208
摘要： A voltage controlled oscillator includes an oscillation controller, first and second current sources, oscillation section, and first and second fluctuation transmitters. The oscillation controller generates first and second control potentials. The first and second current sources generate control currents corresponding to the first and second control potentials, respectively. The oscillation section is connected to a power source potential node via the first current source and connected to a ground potential node via the second current source, and generates a clock. The first fluctuation transmitter is disposed between the power source potential node and the first control potential node, and transmits a potential fluctuation in the power source potential node to the first control potential node. The second fluctuation transmitter is disposed between the ground potential node and the second control potential node, and transmits the potential fluctuation in the ground potential node to the second control potential node.
摘要翻译： 压控振荡器包括振荡控制器，第一和第二电流源，振荡部分以及第一和第二波动发射器。 振荡控制器产生第一和第二控制电位。第一和第二电流源分别产生对应于第一和第二控制电位的控制电流。 振荡部经由第一电流源与电源电位节点连接，经由第二电流源与地电位节点连接，生成时钟。 第一波动发射器设置在电源电势节点和第一控制电位节点之间，并且将电源电位节点中的电位波动发送到第一控制电位节点。 第二波动发射器设置在地电位节点和第二控制电位节点之间，并将地电势节点中的电位波动发送到第二控制电位节点。
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4.发明授权公开(公告)号：US06246271B1
公开(公告)日：2001-06-12
申请号：US09521208
申请日：2000-03-08
申请人： Shuichi Takada , Akihiko Yoshizawa
发明人： Shuichi Takada , Akihiko Yoshizawa
IPC分类号： H03B1900
CPC分类号： H03K5/00006
摘要： In a frequency multiplier which generates a multiple output of a reference signal, a reference signal and its inverted signal are propagated through a pair of delay circuits each including a given number of delay cells connected in cascade. The delay cells delay a signal by time t when a control signal is at a high level and delay a signal by time 2t when a control signal is at a low level. The outputs of the delay circuits are added together by an adder circuit to generate a multiple output without using a low-pass filter but by non-feedback control.
摘要翻译： 在产生参考信号的多重输出的倍频器中，参考信号及其反相信号通过一对延迟电路传播，每对延迟电路包括级联连接的给定数量的延迟单元。 当控制信号处于低电平时，延迟单元将信号延迟时间t，并且当控制信号处于低电平时，将信号延迟时间2t。 延迟电路的输出由加法器电路相加在一起，以产生多路输出而不使用低通滤波器，而是通过非反馈控制。
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公开(公告)号：US5814807A
公开(公告)日：1998-09-29
申请号：US840723
申请日：1997-04-25
IPC分类号： G02B5/30 , G02B27/28 , G11B7/12 , G11B7/135 , G11B7/22 , G11B11/105 , G02B7/04 , G02B27/64 , G11B7/00
CPC分类号： G11B7/1356 , G02B27/283 , G02B5/3083 , G11B11/10543 , G11B7/123 , G11B7/22
摘要： An optical pick-up head for reading writing information from on a magneto-optical record medium including a semiconductor laser, a multi-image plane parallel plate for separating an incident light beam emitted by the semiconductor laser from a return light beam reflected by the optical record medium and dividing the return beam transmitted through and refracted by the multi-image plane parallel plate into a plurality of return light beams, and a signal detecting photodetector receiving a plurality of return light beams, wherein the multi-image plane parallel plate is formed by first and second prisms made of birefringent material and is arranged such that major and minor axes of astigmatism introduced by the plane parallel plate are inclined by 45.degree. with respect to an information track. An optic axis of the first prism is set such that the return beam is separated into ordinary and extraordinary light beams having identical intensities and an optic axis of the second prism is rotated with respect to the optic axis of the first prism. The optical elements are positioned and mounted on a mounting substrate having guide walls formed by a photolithography.
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6.发明授权Voltage-controlled ring oscillator with level converting and amplitude control circuits 有权具有电平转换和幅度控制电路的压控环形振荡器公开(公告)号：US06323738B1
公开(公告)日：2001-11-27
申请号：US09604721
申请日：2000-06-28
申请人： Akihiko Yoshizawa , Shuichi Takada
发明人： Akihiko Yoshizawa , Shuichi Takada
IPC分类号： H03B502
CPC分类号： H03B5/24 , H03B2201/038 , H03K3/0231 , H03L1/00 , H03L5/00
摘要： A voltage-controlled oscillator comprises a level converting circuit, an amplitude controller, a voltage-controlled oscillation section having differential delay cells connected in a ring form, and an output level converting circuit. The level converting circuit has limiters which respectively limit a maximum value and a minimum value of a control current. Those limiters permit only a region where the voltage-controlled oscillation section properly performs its oscillating operation to be used.
摘要翻译： 压控振荡器包括电平转换电路，幅度控制器，具有以环形形式连接的差分延迟单元的压控振荡部分和输出电平转换电路。 电平转换电路具有分别限制控制电流的最大值和最小值的限制器。 这些限制器仅允许使用压控振荡部分适当地执行其振荡操作的区域。
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7.发明授权Digital-to-analog converter in which an analog output of low order bits is attenuated, and added to an analog output of high order bits 有权其中低阶位的模拟输出被衰减并被加到高位的模拟输出的数模转换器
公开(公告)号：US6163288A
公开(公告)日：2000-12-19
申请号：US168381
申请日：1998-10-08
申请人： Akihiko Yoshizawa
发明人： Akihiko Yoshizawa
摘要： A digital-to-analog converter has a first digital-to-analog converter for M bits, for receiving M high order bits of input data of N bits, and then outputting a predetermined analog output, and a second digital-to-analog converter for (N-M) bits, for receiving (N-M) low order bits of the input data, and then outputting a predetermined analog output. An attenuator attenuates the analog output of the second digital-to-analog converter to 1/2.sup.M. An analog operating circuit adds the analog output of the first digital-to-analog converter and the attenuated analog output of the second digital-to-analog converter, and outputs an analog output as a result of addition of those analog outputs.
摘要翻译： 数模转换器具有用于M位的第一数模转换器，用于接收N位的输入数据的M个高位位，然后输出预定的模拟输出，以及第二数模转换器 （NM）位，用于接收（NM）输入数据的低位，然后输出预定的模拟输出。 衰减器将第二个数/模转换器的模拟输出衰减到1 / 2M。 模拟操作电路将第一个数模转换器的模拟输出和第二个数 - 模转换器的衰减模拟输出相加，并作为这些模拟输出的相加结果输出一个模拟输出。
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公开(公告)号：US6005420A
公开(公告)日：1999-12-21
申请号：US825571
申请日：1997-03-31
申请人： Akihiko Yoshizawa , Shuichi Takada
发明人： Akihiko Yoshizawa , Shuichi Takada
CPC分类号： H03L7/0805 , G06F7/68 , H03K5/00006 , H03L7/0812 , H03L7/16 , H03L7/23
摘要： A frequency multiplying circuit includes a plurality of frequency multipliers in a series array. The multiplying ratio of the initial stage frequency multiplier is the greatest compared with the remaining frequency multiplier or multipliers. Further, at least one of the frequency multipliers uses a voltage controlled delay circuit.
摘要翻译： 倍频电路包括串联阵列中的多个频率乘法器。 与剩余的倍频器或乘法器相比，初级倍频器的倍率最大。 此外，至少一个频率乘法器使用电压控制延迟电路。
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9.发明授权Optical pick-up head and integrated type optical unit for use in optical pick-up head 失效用于光学拾音头的光学拾取头和集成型光学单元
公开(公告)号：US5898167A
公开(公告)日：1999-04-27
申请号：US105009
申请日：1998-06-26
CPC分类号： G11B7/1356 , G02B27/283 , G02B5/3083 , G11B11/10543 , G11B7/123 , G11B7/22
摘要： An optical pick-up head for reading writing information from on a magneto-optical record medium including a semiconductor laser, a multi-image plane parallel plate for separating an incident light beam emitted by the semiconductor laser from a return light beam reflected by the optical record medium and dividing the return beam transmitted through and refracted by the multi-image plane parallel plate into a plurality of return light beams, and a signal detecting photodetector receiving a plurality of return light beams, wherein the multi-image plane parallel plate is formed by first and second prisms made of birefringent material and is arranged such that major and minor axes of astigmatism introduced by the plane parallel plate are inclined by 45.degree. with respect to an information track. An optic axis of the first prism is set such that the return beam is separated into ordinary and extraordinary light beams having identical intensities and an optic axis of the second prism is rotated with respect to the optic axis of the first prism. The optical elements are positioned and mounted on a mounting substrate having guide walls formed by a photolithography.
摘要翻译： 一种用于从包括半导体激光器的磁光记录介质读取写入信息的光学拾取头，用于将由半导体激光器发射的入射光束与由光学器件反射的返回光束分离的多图像平面平行板 记录介质，并将通过多像平面平行板透射并折射的返回光束分割成多个返回光束，以及接收多个返回光束的信号检测光电检测器，其中形成多像平面平行板 通过由双折射材料制成的第一和第二棱镜，并且被布置成使得由平面平行板引入的散光的主轴和短轴相对于信息轨道倾斜45°。 第一棱镜的光轴被设置为使得返回光束被分离成具有相同强度的普通和非凡光束，并且第二棱镜的光轴相对于第一棱镜的光轴旋转。 光学元件被定位并安装在具有通过光刻形成的引导壁的安装基板上。
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公开(公告)号：US5566142A
公开(公告)日：1996-10-15
申请号：US384843
申请日：1995-02-07
摘要： The present invention is directed to an apparatus using an integrated type pickup as an optical head for writing and reading optical information and capabling of writing data at high speeds. The apparatus includes a laser diode having an active layer at its intermediate position and having one area side held over a surface of a semiconductor substrate with an insulating layer interposed between the semiconductor substrate and the laser diode relative to the active layer. The laser diode has two areas with the active layer as a boundary and a constant potential is applied from a power supply to the insulating layer side of the laser diode and a transistor (laser diode drive unit) is provided to apply a modulation signal to the other area of the laser diode so that the laser diode is driven to modulate its output. By doing so, a constant potential is maintained at the semiconductor substrate and at the insulating layer's side of the laser diode and the modulation signal is applied to the other area side of the laser diode. When a drive current of the laser diode is varied by the modulation signal, a voltage variation occurs only on the other area side of the laser diode so that a high-frequency drive current, if flowing through the insulating layer side, is small and hence the laser diode has its output to be modulated effectively.
摘要翻译： 本发明涉及使用集成型拾取器作为用于写入和读取光学信息的光学头和高速写入数据的功能的装置。 该装置包括激光二极管，该激光二极管在其中间位置处具有有源层，并且其一个区域侧保持在半导体衬底的表面上，相对于有源层，绝缘层介于半导体衬底和激光二极管之间。 激光二极管具有两个区域，其中有源层作为边界，并且从电源向激光二极管的绝缘层侧施加恒定电位，并且提供晶体管（激光二极管驱动单元）以将调制信号施加到 激光二极管的其他区域，以便驱动激光二极管来调制其输出。 通过这样做，在半导体衬底和激光二极管的绝缘层侧保持恒定的电位，并且将调制信号施加到激光二极管的另一个区域侧。 当激光二极管的驱动电流由调制信号变化时，仅在激光二极管的另一区域侧产生电压变化，使得如果流过绝缘层侧的高频驱动电流较小，因此 激光二极管的输出有效调制。
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