公开(公告)号：US4757487A

公开(公告)日：1988-07-12

申请号：US734774

申请日：1985-05-16

申请人： Tsuneo Yanagida ,  Kiichi Kato

发明人： Tsuneo Yanagida ,  Kiichi Kato

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/095 ,  G11B21/08

CPC分类号： G11B7/0901 ,  G11B7/085 ,  G11B7/08547

摘要： In a method of detecting track crossings on an optical disc, a light source irradiates a light beam onto an optical disc having guide tracks in the form of a recess and the light beam is reflected and diffracted into a zero order light beam and positive and negative primary light beams. The light beams are defocused so as to produce interference patterns between the zero light beam and the positive and negative primary light beams. The interference patterns are detected by a four split light detector disposed between two parts of a two split detector. The outputs of the detectors are fed to an adder and to a subtractor for producing a sum signal and a difference signal respectively. The sum signal and difference signal are fed to a phase detector. Defocusing of the light beams is effected by a focusing coil to which is fed the amplified output of an adder of a reference signal controlled by a control circuit.

摘要翻译： 在一种检测光盘上的轨道交叉的方法中，光源将光束照射到具有凹陷形式的导轨的光盘上，并且光束被反射并衍射成零级光束，并且正和负 主光束。 光束散焦，从而产生零光束与正，负主光束之间的干涉图案。 干涉图案由设置在两个分离检测器的两个部分之间的四个分开的光检测器检测。 检测器的输出被馈送到加法器和减法器，用于分别产生和信号和差分信号。 和信号和差分信号被馈送到相位检测器。 光束的散焦通过聚焦线圈实现，聚焦线圈馈送由控制电路控制的参考信号的加法器的放大输出。

公开(公告)号：US5249171A

公开(公告)日：1993-09-28

申请号：US697910

申请日：1991-05-01

申请人： Nobuhide Matsubayashi ,  Tsuneo Yanagida ,  Kiichi Kato

发明人： Nobuhide Matsubayashi ,  Tsuneo Yanagida ,  Kiichi Kato

IPC分类号： G11B7/135 ,  G11B11/105

CPC分类号： G11B7/1362 ,  G11B11/10543

摘要： An opto-magnetic pick-up device for use in an information recording and reproducing device is disclosed. The device comprises a phase difference correcting device capable of correcting the phase difference between the linearly polarized component of the reflected light from the recording medium and a polarized component vertical to the linearly polarized component.

摘要翻译： 公开了一种用于信息记录和再现装置的光磁拾取装置。 该装置包括能够校正来自记录介质的反射光的线偏振分量与垂直于线偏振分量的偏振分量之间的相位差的相位差校正装置。

公开(公告)号：US4472748A

公开(公告)日：1984-09-18

申请号：US336319

申请日：1981-12-31

申请人： Kiichi Kato ,  Tsuneo Yanagida

发明人： Kiichi Kato ,  Tsuneo Yanagida

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10517 ,  G11B11/10536

摘要： In a method of recording an information signal in an opto-magnetic record disc which has an easily magnetizable axis perpendicular to its surface, a constant erasing light beam and a modulated recording light beam are focussed by a single objective lens on adjacent tracks and an external magnetic field is applied to the record medium. The erasing and recording operations can be carried out at the same time by inverting the polarity of the external magnetic field track by track.

摘要翻译： 在将信息信号记录在具有与其表面垂直的易磁化轴的光磁记录盘中的方法中，恒定的擦除光束和调制的记录光束被相邻轨道上的单个物镜聚焦，外部 磁场被施加到记录介质上。 擦除和记录操作可以通过使轨道上的外部磁场轨迹的极性反转来同时进行。

公开(公告)号：US07423761B2

公开(公告)日：2008-09-09

申请号：US11651959

申请日：2007-01-11

申请人： Yuichi Teramura ,  Kiichi Kato

发明人： Yuichi Teramura ,  Kiichi Kato

IPC分类号： G01B9/02

CPC分类号： G01B9/02091 ,  G01B9/02044 ,  G01B2290/70

摘要： A light source apparatus is equipped with at least three light sources each having a predetermined wavelength interval and different central wavelengths. At least one multiplexing means having wavelength selectivity, for multiplexing light emitted from each of a first group and a second group of the light sources is provided, the first group of light sources including odd ordered light sources and the second group of light sources including even ordered light sources when counted in order of lengths of the central wavelengths thereof. Multiplexing means not having wavelength selectivity, for multiplexing light emitted from the first group of light sources and the second group of light sources is also provided.

摘要翻译： 光源装置配备有至少三个光源，每个光源具有预定的波长间隔和不同的中心波长。 至少一个多路复用装置具有波长选择性，用于多路复用从第一组和第二组光源发出的光，第一组光源包括奇数有序光源，第二组光源包括均匀的 当按照其中心波长的长度的顺序计数有序的光源。 复用意味着不具有波长选择性，用于复用从第一组光源发射的光和第二组光源。

公开(公告)号：US07226175B2

公开(公告)日：2007-06-05

申请号：US11142254

申请日：2005-06-02

申请人： Kenji Matsumoto ,  Toshiro Hayakawa ,  Yoshinori Morimoto ,  Kiichi Kato

发明人： Kenji Matsumoto ,  Toshiro Hayakawa ,  Yoshinori Morimoto ,  Kiichi Kato

IPC分类号： G02B27/00

CPC分类号： G03B27/42

摘要： When a ratio R between a total angle φ of a widening angle in a median intensity of light of a light source (a GaN based semiconductor laser) and a total angle 2/φ of a widening angle of light defining a numerical aperture NA of a collimator optical system (collimator lens) is defined as R=(sin−1NA)×2/φ, the numerical aperture of the collimator optical system (collimator lens) is set so that 2.0≧R≧0.58. Thus, an image exposure device is provided that can suppress stray light of a light source that emits a large amount of stray light.

摘要翻译： 当光源（GaN基半导体激光器）的中值光强度中的加宽角的总角度φi与限定数值孔径NA的光的加宽角的总角度2 / phi之间的比率R 准直器光学系统（准直透镜）被定义为R =（sin -1）NA）×2 / phi，准直器光学系统（准直透镜）的数值孔径被设定为使得2.0> = R> = 0.58。 因此，提供能够抑制发出大量杂散光的光源的杂散光的图像曝光装置。

公开(公告)号：US20050218413A1

公开(公告)日：2005-10-06

申请号：US11142254

申请日：2005-06-02

申请人： Kenji Matsumoto ,  Toshiro Hayakawa ,  Yoshinori Morimoto ,  Kiichi Kato

发明人： Kenji Matsumoto ,  Toshiro Hayakawa ,  Yoshinori Morimoto ,  Kiichi Kato

IPC分类号： G03B27/42 ,  H01L33/00

CPC分类号： G03B27/42

摘要： When a ratio R between a total angle φ of a widening angle in a median intensity of light of a light source (a GaN based semiconductor laser) and a total angle 2/φ of a widening angle of light defining a numerical aperture NA of a collimator optical system (collimator lens) is defined as R=(sin−1NA)×2/φ, the numerical aperture of the collimator optical system (collimator lens) is set so that 2.0≧R≧0.58. Thus, an image exposure device is provided that can suppress stray light of a light source that emits a large amount of stray light.

公开(公告)号：US4682311A

公开(公告)日：1987-07-21

申请号：US823559

申请日：1986-01-29

申请人： Nobuhide Matsubayashi ,  Kiichi Kato

发明人： Nobuhide Matsubayashi ,  Kiichi Kato

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10532

摘要： A linearly polarized light is projected upon a recording medium of a photomagnetic type; the reflected light is rotated by an appropriate angle through a halfwave plate and split into a reflected light and a transmitted light through a beam splitter having reflection factors of 0 or 100% for p- or s-polarized light in such a way that the beam splitter functions as an analyzer for one of the reflected and transmitted lights. The other of the reflected and transmitted lights is passed through an analyzer. The two lights passed through the beam splitter and the analyzer are detected by two photodetectors separately and applied to a differential amplifier to generate a reproduction signal of high S/N ratio without the use of a half mirror R.sub.p =R.sub.s =50% which is very difficult to manufacture.

摘要翻译： 线偏振光投影在光磁型记录介质上; 反射光通过半波片旋转适当的角度，并且通过分光镜分离成反射光和透射光，该分束器对于p-偏振光或S偏振光具有0或100％的反射因子，使得光束 分离器用作反射和透射光之一的分析仪。 反射和透射的另一个光通过分析仪。 两个光通过分束器，分析仪分别由两个光电检测器检测，并应用于差分放大器以产生高S / N比的再现信号，而不使用半反射镜Rp = Rs = 50％ 难以制造

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。

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。

公开(公告)号：US4495407A

公开(公告)日：1985-01-22

申请号：US362613

申请日：1982-03-29

申请人： Hiroshi Kodama ,  Masaharu Sakamoto ,  Ken Ohshima ,  Shoji Yoshikawa ,  Kunio Yamamiya ,  Kiichi Kato

发明人： Hiroshi Kodama ,  Masaharu Sakamoto ,  Ken Ohshima ,  Shoji Yoshikawa ,  Kunio Yamamiya ,  Kiichi Kato

IPC分类号： G02B7/00 ,  G02B7/32 ,  G11B7/085 ,  G11B7/09 ,  G01J1/20

CPC分类号： G11B7/08511 ,  G02B7/32 ,  G11B7/0908

摘要： A system for focusing an optical head onto a flat surface has a mechanism for moving the optical head in the direction of the optical axis of the head and a mechanism for moving an objective lens in the optical head in the direction of the optical axis of the lens. A laser beam projected from the objective lens of the optical head is reflected on the flat surface, is reflected on the beam splitter, and is introduced into a detector unit. The detector unit thus generates a focusing signal having a level responsive to the distance between the objective lens and the surface. The optical head is lowered by the mechanism for moving the optical head in accordance with the focusing signal when it passes a predetermined point, and is operated to locate the focal point of the objective lens on the surface. Thereafter, the mechanism for moving the optical head becomes inoperative, and the mechanism for moving the objective lens is operated. This mechanism operates in accordance with the focusing signal and locates the focal point of the objective lens always on the surface.

摘要翻译： 用于将光学头聚焦到平坦表面上的系统具有用于沿着光头的光轴方向移动光学头的机构，以及用于沿光学头的光轴方向移动光学头中的物镜的机构 镜片。 从光头的物镜投射的激光束在平坦表面上反射，在分束器上被反射，并被引入到检测器单元中。 因此，检测器单元产生具有响应物镜与表面之间距离的电平的聚焦信号。 通过用于在通过预定点时根据聚焦信号移动光学头的机构降低光学头，并且操作以将物镜的焦点定位在表面上。 此后，用于移动光学头的机构变得不起作用，并且用于移动物镜的机构被操作。 该机构根据聚焦信号进行操作，并将物镜的焦点始终位于表面上。