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1. 发明授权

US4525825A Method and apparatus for detecting focussing and tracking error signals 失效
标题翻译：用于检测聚焦和跟踪误差信号的方法和装置
公开(公告)号：US4525825A
公开(公告)日：1985-06-25
申请号：US309402
申请日：1981-10-07
申请人： Kenichi Ito , Tohru Musha , Kiichi Kato , Kimiaki Yamamoto
发明人： Kenichi Ito , Tohru Musha , Kiichi Kato , Kimiaki Yamamoto
IPC分类号： G11B7/09 , G11B7/08
CPC分类号： G11B7/09
摘要： A method and an apparatus for detecting a focussing error signal and a tracking error signal of an objective lens with respect to an information track of a video disc on which a reading light spot is focussed by the objective lens includes a detection prism having a reflection surface which is set substantially at a critical angle and a light detector for receiving the light flux reflected by the reflection surface. The light detector is arranged in a far field of the track and having four light receiving regions divided along two orthogonal directions. The focussing error signal is derived as a difference between output signals from the regions aligned in a track direction and the tracking error signal is derived as a difference between output signals from the regions aligned in a direction perpendicular to the track direction. An information signal is obtained as a sum of the output signals from the four regions.
摘要翻译：一种用于检测物镜的聚焦误差信号和跟踪误差信号相对于其上由物镜聚焦的视频光盘的信息轨道的方法和装置，包括具有反射面的检测棱镜其基本上设置为临界角，以及光检测器，用于接收由反射表面反射的光束。光检测器布置在轨道的远场中，具有沿两个正交方向分开的四个光接收区域。聚焦误差信号被导出为来自沿轨道方向对齐的区域的输出信号之间的差异，并且跟踪误差信号被导出为在垂直于磁道方向的方向上排列的区域的输出信号之间的差。获得信息信号作为来自四个区域的输出信号的和。

2. 发明授权

US4453239A Method and apparatus for controlling the focusing and tracking of a light beam using a main and secondary light beam in association with multiple detectors 失效
标题翻译：使用与多个检测器相关的主和次光束来控制光束的聚焦和跟踪的方法和装置
公开(公告)号：US4453239A
公开(公告)日：1984-06-05
申请号：US293082
申请日：1981-08-14
申请人： Tohru Musha , Kiichi Kato , Kenichi Ito
发明人： Tohru Musha , Kiichi Kato , Kenichi Ito
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/08 , G11B7/09 , G11B7/135 , G11B7/12
CPC分类号： G11B7/0917 , G11B7/0903 , G11B2007/0919
摘要： An apparatus and method for recording optically an information signal on a disk-like record medium as a spiral track or concentrical tracks by modulating a main beam by the information signal to be recorded and projecting the modulated main beam onto the record medium. In order to obtain a tracking error signal, a sub beam is also projected on the record medium at an edge of an adjacent track which has been previously recorded and the sub beam reflected by the record medium is detected by a light detector to produce the tracking error signal which is then supplied to a high pass filter to remove a low frequency component from the tracking error signal.
摘要翻译：一种用于通过利用要记录的信息信号调制主光束将信息信号光学地记录在盘状记录介质上作为螺旋轨道或同心轨道的装置和方法，并将调制的主波束投影到记录介质上。为了获得跟踪误差信号，子光束也在先前记录的相邻磁迹的边缘处在记录介质上投影，并且由光检测器检测由记录介质反射的子光束以产生跟踪误差信号然后被提供给高通滤波器以从跟踪误差信号中去除低频分量。

3. 发明授权

US4422168A Method and apparatus for detecting a focussing condition of an objective lens 失效
标题翻译：用于检测物镜的聚焦状态的方法和装置
公开(公告)号：US4422168A
公开(公告)日：1983-12-20
申请号：US292929
申请日：1981-08-14
申请人： Kenichi Ito , Tohru Musha , Kiichi Kato
发明人： Kenichi Ito , Tohru Musha , Kiichi Kato
IPC分类号： G02B7/28 , G11B7/09 , G01J1/36 , G11B7/00
CPC分类号： G11B7/0908 , G11B7/0917 , G11B2007/0919
摘要： A method and apparatus for detecting a focussing error signal of an objective lens with respect to a video disc on which a light beam emitted from a laser light source is to be focussed as a light spot by the objective lens. A light flux reflected by the video disc is made incident upon a detection prism surface which is set substantially at a critical angle with respect to peripheral light fluxes reflected by the video disc, and the peripheral light fluxes reflected by the reflection surface are separately received by two light receiving regions which are spaced apart from each other. The focussing error signal is derived as a difference between output signals from the two light receiving regions.
摘要翻译：一种用于检测物镜相对于其上从激光光源发射的光束被物镜聚焦为光点的视盘的聚焦误差信号的方法和装置。由视频盘反射的光束入射到相对于由视频盘反射的周边光束基本上设定为临界角的检测棱镜表面，并且由反射面反射的周边光束被单独接收两个彼此间隔开的光接收区域。聚焦误差信号被导出为来自两个光接收区域的输出信号之间的差。

4. 发明授权

US4423495A Method and apparatus for recording optically an information signal on a record medium along tracks 失效
标题翻译：在记录介质上光学地记录信息信号的方法和装置
公开(公告)号：US4423495A
公开(公告)日：1983-12-27
申请号：US301098
申请日：1981-09-10
申请人： Tohru Musha , Kiichi Kato , Kenichi Ito
发明人： Tohru Musha , Kiichi Kato , Kenichi Ito
IPC分类号： G02B7/28 , G11B7/09 , G11B7/12 , G11B7/125 , G11B7/135 , G11B7/1359 , G11B11/105 , G11B7/00
CPC分类号： G11B7/0917 , G11B11/10506 , G11B11/10536 , G11B11/10576 , G11B7/0941 , G11B7/12 , G11B7/1359 , G11B2007/0919 , G11B7/0903
摘要： In a method and apparatus of recording optically an information signal on a disc along tracks by projecting a main beam modulated with the information signal onto the rotating disc by means of an objective lens, in order to obtain focussing and tracking error signals, a sub beam inclined with respect to the main beam is also projected onto the disc by means of the objective lens. The main and sub beams reflected by the video disc are made incident as parallel light fluxes upon a detection prism surface which is set substantially at a critical angle with respect to the main beam, but at an angle smaller or larger than the critical angle with respect to the sub beam, and two light fluxes of the reflected main beam which situate on respective sides of a boundary plane including the central light ray and perpendicular to a plane of incidence, and are reflected by the reflection surface are separately received by two light receiving regions which are divided along a boundary plane including the main beam reflected by the reflection surface and perpendicular to the plane of incidence. The focussing error signal is derived as a difference between output signals from the two light receiving regions. The sub beam transmitted through and refracted by the reflection surface is received by a light detector and the tracking error signal is derived by detecting a variation in a light amount of the sub beam impinging upon the light detector.
摘要翻译：在利用物镜将通过信息信号调制的主波束投射到旋转盘上的光盘上将信息信号光学记录在光盘上的方法和装置中，为了获得聚焦和跟踪误差信号，相对于主光束倾斜也通过物镜投影到光盘上。由视频盘反射的主光束和副光束作为平行光束入射到检测棱镜表面上，该检测棱镜表面基本上被设置为相对于主光束的临界角，但是以相对于主光束的临界角小于或大于并且反射主光束的两个光束位于包括中心光线并且垂直于入射平面的边界平面的相应侧上并被反射表面反射的两个光束分别被两个光接收沿着包括由反射面反射并垂直于入射平面的主光束的边界平面分割的区域。聚焦误差信号被导出为来自两个光接收区域的输出信号之间的差。由光检测器接收透射并被反射面折射的子光束，并且通过检测入射到光检测器上的子光束的光量的变化导出跟踪误差信号。

5. 发明授权

US4455085A Method and apparatus for detecting a focussing condition of an objective lens 失效
标题翻译：用于检测物镜的聚焦状态的方法和装置
公开(公告)号：US4455085A
公开(公告)日：1984-06-19
申请号：US292930
申请日：1981-08-14
申请人： Kiichi Kato , Kenichi Ito , Tohru Musha
发明人： Kiichi Kato , Kenichi Ito , Tohru Musha
IPC分类号： G02B7/28 , G11B7/09 , G01J1/36
CPC分类号： G11B7/0908 , G11B7/0917 , G11B2007/0919
摘要： A method and apparatus for detecting a focussing error signal of an objective lens with respect to a video disc on which a light beam emitted from a laser light source is to be focussed as a light spot by the objective lens. A light flux reflected by the video disc is made incident upon a detection prism surface which is set substantially at a critical angle with respect to a central light ray in the reflected light flux, and two light fluxes which situate on respective sides of a boundary plane including the central light ray and perpendicular to a plane of incidence, and are reflected by the reflection surface are separately received by two light receiving regions which are divided along a boundary plane including the central light ray reflected by the reflection surface and perpendicular to the plane of incidence. The focussing error signal is derived as a difference between output signals from the two light receiving regions. A relay lens is arranged between the reflection surface of the detection prism and the light receiving regions and the relay lens forms an image of a pupil of the objective lens on the light receiving regions.
摘要翻译：一种用于检测物镜相对于其上从激光光源发射的光束被物镜聚焦为光点的视盘的聚焦误差信号的方法和装置。由视频盘反射的光束入射到相对于反射光束中的中心光线基本上设定在临界角的检测棱镜表面上，并且位于边界平面的各个侧面上的两个光束包括中心光线并且垂直于入射平面并且由反射表面反射的两个光接收区域被沿着包括由反射表面反射并垂直于平面的中心光线的边界平面划分的两个光接收区域分开地接收的发病率。聚焦误差信号被导出为来自两个光接收区域的输出信号之间的差。中继透镜配置在检测棱镜的反射面和受光区域之间，中继透镜在受光区域形成物镜的光瞳图像。

6. 发明授权

US4509830A Light beam separation method 失效
标题翻译：光束分离法
公开(公告)号：US4509830A
公开(公告)日：1985-04-09
申请号：US345154
申请日：1982-02-02
申请人： Kiichi Kato , Tohru Musha , Kenichi Ito
发明人： Kiichi Kato , Tohru Musha , Kenichi Ito
IPC分类号： G02B27/10 , G11B7/135
CPC分类号： G02B27/126
摘要： A method of separating at least two light beams propagating in the substantially same direction but which propagate with making a small angle therebetween is disclosed, which comprises making one of said light beams incident upon an interface between an isotropic first optical medium having a first refractive index and an isotropic second optical medium having a second refractive index lower than said first refractive index at an incident angle substantially equal to the Brewster angle so that the light beam is substantially totally transmitted through said interface; and making the other light beam incident upon said interface at an incident angle greater than the critical angle so that the light beam is totally reflected by said interface.
摘要翻译：公开了一种分离至少两个沿基本上相同的方向传播但以小角度传播的光束的方法，其包括使所述光束之一入射到具有第一折射率的各向同性的第一光学介质之间的界面上以及具有低于所述第一折射率的第二折射率的各向同性的第二光学介质，其入射角基本上等于布鲁斯特角，使得光束基本上完全透过所述界面; 并使另一光束以大于临界角的入射角入射在所述界面上，使得光束被所述界面全反射。

7. 发明授权

US4505584A Method and apparatus for detecting focussing error signal of objective lens 失效
标题翻译：用于检测物镜聚焦误差信号的方法和装置
公开(公告)号：US4505584A
公开(公告)日：1985-03-19
申请号：US339718
申请日：1982-01-15
申请人： Kiichi Kato , Tohru Musha , Kenichi Ito
发明人： Kiichi Kato , Tohru Musha , Kenichi Ito
IPC分类号： G02B7/09 , G02B27/16 , G11B7/09 , G01J1/36
CPC分类号： G02B27/16 , G11B7/0908 , G11B7/0917 , G11B2007/0919
摘要： In order to derive a focussing error signal of an objective lens with respect to a video disc on which a light beam is focussed by the objective lens, the P-polarized light beam is made incident upon a prism and then upon a thin film which is applied to the prism and has a refractive index higher than that of the prism, and the light beam reflected by a boundary surface between the thin film and the air is detected by a photo-detector having two light receiving regions. The thin film is made of material having a higher refractive index than that of the prism. Between the prism and the thin film there may be interposed at least one additional thin film in such a manner that the lower and higher refractive index thin films are alternately arranged.
摘要翻译：为了导出物镜相对于其上由物镜聚焦的视盘的聚焦误差信号，P偏振光束入射到棱镜上，然后被置于薄膜上，该薄膜是施加到棱镜并且具有比棱镜高的折射率，并且由具有两个光接收区域的光检测器检测由薄膜和空气之间的边界面反射的光束。该薄膜由折射率高于棱镜的材料制成。在棱镜和薄膜之间可以插入至少一个附加薄膜，使得下折射率薄膜和高折射率薄膜交替布置。

8. 发明授权

US4425636A Method and apparatus for reproducing optically an information recorded on a record medium along tracks 失效
标题翻译：用于沿着轨道光学地再现记录在记录介质上的信息的方法和装置
公开(公告)号：US4425636A
公开(公告)日：1984-01-10
申请号：US301092
申请日：1981-09-10
申请人： Tohru Musha , Kiichi Kato , Kenichi Ito
发明人： Tohru Musha , Kiichi Kato , Kenichi Ito
IPC分类号： G02B7/28 , G11B7/08 , G11B7/09 , G11B7/12 , G11B7/135 , G11B7/1359 , G11B7/1381 , G11B11/105 , G11B7/00 , G11B21/02
CPC分类号： G11B11/10515 , G11B11/10543 , G11B11/10576 , G11B7/08 , G11B7/0901 , G11B7/0908 , G11B7/0917 , G11B7/12 , G11B7/1359 , G11B7/1381 , G11B2007/0919
摘要： In a method and apparatus for detecting an information signal and a focussing error signal of an objective lens with respect to a video disc on which main and sub beams emitted from a laser light source are to be focussed as light spots by the objective lens, the main and sub beams reflected by the video disc are made incident as parallel light fluxes upon a detection prism surface which is set substantially at a critical angle with respect to the main beam, but at an angle smaller or larger than the critical angle with respect to the sub beam, and two light fluxes of the reflected main beam which situate on respective sides of a boundary plane including the central light ray and perpendicular to a plane of incidence, and are reflected by the reflection surface are separately received by two light receiving regions which are divided along a boundary plane including the main beam reflected by the reflection surface and perpendicular to the plane of incidence. The focussing error signal is derived as a difference between output signals from the two light receiving regions and the information signal is derived as a sum of the output signals from the two light receiving regions. The sub beam transmitted through and refracted by the reflection surface is received by a light detector and a tracking error signal is derived by detecting a variation in a light amount of the sub beam impinging upon the light detector.
摘要翻译：在用于检测物镜的信息信号和聚焦误差信号的方法和装置中，相对于其中从激光光源发射的主光束和子光束被物镜聚焦为光点的视盘，由视频盘反射的主光束和副光束作为平行光束入射到检测棱镜表面上，检测棱镜表面相对于主光束基本上设置在临界角，但是以相对于主光束的临界角小于或大于副光束和位于包括中心光线并且垂直于入射平面的边界面的相应侧上并被反射表面反射的反射主光束的两个光束分别被两个光接收区域其沿着包括由反射表面反射并垂直于入射平面的主光束的边界平面划分。聚焦误差信号被导出为来自两个光接收区域的输出信号之间的差异，并且信息信号被导出为来自两个光接收区域的输出信号的和。由光检测器接收透射并被反射面折射的子光束，并且通过检测入射到光检测器上的子光束的光量的变化导出跟踪误差信号。

9. 发明授权

US4507764A Objective lens drive device with tracking error correction with flux of opposite direction 失效
标题翻译：物镜驱动装置，具有相反方向的磁通跟踪误差校正
公开(公告)号：US4507764A
公开(公告)日：1985-03-26
申请号：US296112
申请日：1981-08-25
申请人： Tohru Musha
发明人： Tohru Musha
IPC分类号： G02B7/08 , G02B21/24 , G11B7/09 , G11B7/12 , G02B7/02 , G02B7/11
CPC分类号： G02B7/08 , G02B21/241 , G11B7/0929
摘要： An objective lens drive device for driving an objective lens comprises an objective lens drive mechanism arranged at both sides of the objective lens for flanking the objective lens in the direction of displacement of the objective lens. The objective lens drive mechanism comprises an objective lens supporting mechanism at opposite sides of the objective lens and being bent perpendicularly to the optical axis of the objective lens and a data track and which displaceably support the objective lens in the perpendicular direction, movable magnetic bodies associated with respective lens supporting mechanisms at opposite sides of the objective lens and which move with the objective lens, first and second stationary yokes which flank the movable magnetic bodies perpendicularly to the direction of displacement, and first and second coils which are wound around the first and second stationary yokes, respectively for generating a magnetic field passing through the first and second stationary yokes and said movable members. The distribution of the magnetic field of said objective lens drive mechanism is made symmetrical about the optical axis of the objective lens and a current corresponding to a tracking error signal which represents the relative misalignment is supplied to said first and second coils of the respective objective lens drive mechanism.
摘要翻译：用于驱动物镜的物镜驱动装置包括物镜驱动机构，该物镜驱动机构设置在物镜的两侧，用于使物镜在物镜的位移方向上侧面。物镜驱动机构包括在物镜的相对侧处的物镜支撑机构，并垂直于物镜的光轴弯曲，数据轨道沿着垂直方向可移动地支撑物镜，可动磁体相关联在物镜的相对侧处具有相应的透镜支撑机构，并且与物镜一起移动，与可移动磁体垂直于位移方向侧面的第一和第二固定轭，以及卷绕在第一和第二线圈上的第一和第二线圈第二固定轭，用于产生穿过第一和第二固定轭和所述可移动构件的磁场。所述物镜驱动机构的磁场分布使得物镜的光轴对称，并且将相应于相对未对准的跟踪误差信号的电流提供给各个物镜的所述第一和第二线圈驱动机构。

10. 发明授权

US4644516A Optical head 失效
标题翻译：光头
公开(公告)号：US4644516A
公开(公告)日：1987-02-17
申请号：US603299
申请日：1984-04-24
申请人： Tohru Musha
发明人： Tohru Musha
IPC分类号： G02B7/00 , G11B7/08 , G11B7/09 , G11B7/12 , G11B7/22 , G11B7/00
CPC分类号： G11B7/0917 , G11B7/12 , G11B2007/0919 , G11B7/22
摘要： An optical head for reading a signal recorded along spiral or concentric tracks on an optical disc including a semiconductor laser for emitting a linearly polarized light beam, a polarization prism for transmitting the light beam, an objective lens for projecting the light beam upon the optical disc and for collecting a light beam reflected by the optical disc, a critical angle prism for totally reflecting the light beam reflected by the polarization prism and a light detector for receiving the light beam totally reflected by an optical surface of the critical angle prism. The polarization prism and critical angle prism are integrally coupled with each other to form an assembly of prisms which is rotated to adjust an incident angle of the light beam impinging upon the optical surface of critical angle prism substantially at a critical angle of total reflection.
摘要翻译：一种用于读取在包括用于发射线偏振光束的半导体激光器的光盘上沿着螺旋或同心轨道记录的信号的光学头，用于透射光束的偏振棱镜，用于将光束投影到光盘上的物镜并且用于收集由光盘反射的光束，用于全反射由偏振棱镜反射的光束的临界角棱镜和用于接收由临界角棱镜的光学表面全反射的光束的光检测器。偏振棱镜和临界角棱镜彼此一体地联接以形成棱镜的组件，其被旋转以调节入射到临界角棱镜的光学表面上的光束的入射角，基本上处于全反射的临界角。

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