公开(公告)号：US5162661A

公开(公告)日：1992-11-10

申请号：US608926

申请日：1990-11-05

申请人： Katsuharu Sato ,  Shoji Taniguchi ,  Naoharu Yanagawa

发明人： Katsuharu Sato ,  Shoji Taniguchi ,  Naoharu Yanagawa

IPC分类号： G01B11/02 ,  G01D5/30 ,  G11B7/095 ,  G11B11/105

CPC分类号： G01B11/026 ,  G01D5/30 ,  G11B11/10576 ,  G11B7/0956 ,  G01B2210/44

摘要： A position detector includes: light emitting component for irradiating the surface of an object to be measured; two light receiving components for receiving light reflected by the measured surface, a distance from one of the light receiving components to the measured surface as viewed in a direction substantially perpendicular to the surface being different from a distance from the other of the light receiving components to the surface; calculating circuit for calculating a correction quantity for correcting the distances between the light receiving components and the surface, with the correction quantity being calculated on the basis of a difference between the output signals of the light receiving components; and, moving component for correcting the distances between the measured surface and the light receiving components in accordance with the correction quantity. A first embodiment has two light receiving components each spaced at different distances from the surface. A second embodiment has two light receiving components disposed between two light emitting components, or two light emitting components disposed between two light receiving components. A third embodiment has two light receiving components spaced at a same distance from the surface, but each spaced at different distances from a light emitting components.

公开(公告)号：US4773052A

公开(公告)日：1988-09-20

申请号：US778098

申请日：1985-09-20

申请人： Satoshi Sugiura ,  Katsuharu Sato

发明人： Satoshi Sugiura ,  Katsuharu Sato

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/095 ,  G11B7/12 ,  G11B17/34 ,  G11B19/02

CPC分类号： G11B19/02 ,  G11B17/34 ,  G11B7/085 ,  G11B7/0903 ,  G11B7/0956 ,  G11B7/12

摘要： In a compatible recording and reproducing apparatus which is capable of recording and reproducing information on both a video disk and a digital audio disk, a relative angle between an optical axis of a laser beam emitted from a pickup and the disk is adjusted so as to be suitable for the disk loaded on the apparatus. Further, the movement of the pickup in the radial direction of the disk is regulated in accordance with the difference in the outer diameter of the two kinds of disks. A problem due to the difference of the track pitch in the two kinds of disks is solved by moving the pickup in a direction perpendicular to a radial direction of the disk. In addition, an objective lens for focusing the laser beam on the disk is selected within a predetermined range of an effective numerical aperture in order to simplify an optical system of the apparatus.

摘要翻译： 在能够在视频盘和数字音频盘上记录和再现信息的兼容的记录和再现装置中，调整从拾取器发射的激光束的光轴与盘之间的相对角度，以便 适用于设备上装载的磁盘。 此外，拾取器在盘的径向上的移动根据两种盘的外径的差异来调节。 通过在与盘的径向垂直的方向上移动拾取器来解决由于两种盘中的轨道间距的差异引起的问题。 此外，为了简化装置的光学系统，在有效数值孔径的预定范围内选择用于将激光束聚焦在盘上的物镜。

公开(公告)号：US4663750A

公开(公告)日：1987-05-05

申请号：US662037

申请日：1984-10-18

申请人： Kenjiro Hamanaka ,  Shinsaku Nozu ,  Katsuharu Sato ,  Hozumi Tanaka

发明人： Kenjiro Hamanaka ,  Shinsaku Nozu ,  Katsuharu Sato ,  Hozumi Tanaka

IPC分类号： G02B7/28 ,  G11B7/09

CPC分类号： G11B7/094 ,  G11B7/0909

摘要： A focus error detection device to be used in an optical system for recording and/or playing back information, including a light detector made up of four light receiving elements arranged symmetrically with respect to the center of the light detector, a multiplication means for generating a pair of multiplication signal by multiplying output signals of two light receiving elements which are arranged symmetrically with respect to the center of the light detector. The multiplication signals are applied to a subtraction means where the focus error signal is generated by the subtraction between the multiplication signals. Thereby the off-set of the focus error signal which has been caused by the deviation of the position of the center of the light beam from the center of the light detector is by far reduced.

摘要翻译： 一种在用于记录和/或重放信息的光学系统中使用的聚焦误差检测装置，包括由相对于光检测器的中心对称布置的四个光接收元件构成的光检测器，乘法装置，用于产生 通过将相对于光检测器的中心对称布置的两个光接收元件的输出信号相乘来生成一对乘法信号。 乘法信号被施加到减法装置，其中通过相减信号产生聚焦误差信号。 因此，由于光束中心的位置与光检测器的中心的偏离而引起的聚焦误差信号的偏离被大大减小。

公开(公告)号：US4406520A

公开(公告)日：1983-09-27

申请号：US292714

申请日：1981-08-13

申请人： Katsuharu Sato

发明人： Katsuharu Sato

IPC分类号： G02B5/04 ,  G02B27/10 ,  G02B27/28 ,  G11B7/08 ,  G11B7/12 ,  G11B7/135 ,  G02B3/06 ,  G02B5/30

CPC分类号： G02B27/144 ,  G02B27/28 ,  G02B27/283 ,  G02B5/04 ,  G11B7/08 ,  G11B7/12 ,  G11B7/1356

摘要： An optical system for use in a signal pickup device of, for example, an optical video and/or audio disc player, comprising a beam splitter prism composed of two component segments forming therebetween a light polarization or semi-reflective mirror plane inclined at the angle of 45 degrees to a predetermined path of light through the prism, each of the component segments having an outwardly curved surface portion through which the path of light extends.

摘要翻译： 一种用于例如光学视频和/或音频光盘播放器的信号拾取装置中的光学系统，包括由两个分量段组成的分光棱镜，所述分光棱镜在其间形成以倾斜角度的光偏振或半反射镜面 与通过棱镜的光的预定路径成45度，每个分量段具有光路延伸穿过的向外弯曲的表面部分。

公开(公告)号：US4513408A

公开(公告)日：1985-04-23

申请号：US384244

申请日：1982-06-02

申请人： Susumu Nomura ,  Katsuharu Sato

发明人： Susumu Nomura ,  Katsuharu Sato

IPC分类号： G06K7/015 ,  G01S17/88 ,  G02B7/28 ,  G11B7/09 ,  G11B7/12 ,  G11B7/133 ,  G11B7/1359 ,  G11B7/1381 ,  G11B7/00

CPC分类号： G11B7/1359 ,  G01S17/88 ,  G11B7/0916 ,  G11B7/133 ,  G11B7/1381

摘要： In a video and/or audio disc information reproducing apparatus in which the video and/or audio information carried on a video and/or audio disc is picked up with a beam of light incident on the disc to trace the record track on the disc, an error detecting system comprising optical means to emit a beam of light for tracing the record track and producing a signal-carrying beam of light carrying signals picked up from the record track, beam-splitting means to split the signal-carrying beam into two component beams, light-sensitive transducer means responsive to the component beams and having at least four discrete light-sensitive surfaces separate from one another across a first junction line parallel with a line tangent to the record track and a second junction line parallel with a line perpendicular to the record track, the transducer means being operative to produce a first error signal representative of the difference between the intensities of light incident on the light-sensitive surfaces separate from each other across the first junction line and a second error representative of the difference between the intensities of the light respectively incident on the light-sensitive surfaces separate across the second junction line.

摘要翻译： 在视频和/或音频盘信息再现装置中，其中以在光盘上入射的光束拾取在视频和/或音频盘上携带的视频和/或音频信息以跟踪盘上的记录轨道， 误差检测系统，包括光学装置，用于发射用于跟踪记录轨道的光束，并产生携带从记录轨道拾取的信号的携带光的光束，分束装置将信号载体束分成两部分 光束传感器装置，其响应于分量光束并且具有至少四个离散的光敏表面，跨越与与记录轨道相切的线平行的第一连接线，以及与垂直线垂直的第二连接线 到记录轨道，换能器装置可操作以产生表示入射在感光体上的光的强度之间的差异的第一误差信号 在第一连接线上彼此分开的表面和表示分别入射在穿过第二连接线的光敏表面上的光的强度之间的差异的第二误差。

公开(公告)号：US5132950A

公开(公告)日：1992-07-21

申请号：US466558

申请日：1990-01-17

申请人： Katsuharu Sato ,  Naoharu Yanagawa

发明人： Katsuharu Sato ,  Naoharu Yanagawa

IPC分类号： G11B7/135 ,  G11B11/105

CPC分类号： G11B7/1381 ,  G11B11/10543 ,  G11B7/0909 ,  G11B7/0912 ,  G11B7/1356

摘要： An optical head for use with a photomagnetic recording/reproducing device which is small in number of parts, compact in light path, small in overall size, easy to assemble and adjust, small in number of errors in adjustment, and high in reliability. The optical head comprises a prism for splitting a beam of light from an objective lens, and a light receiving element for receiving light from the prism to produce an electric signal from which a servo signal and a reproduction signal are to be produced. The prism has parallel incident and emergent side transmitting faces and first and second parallel reflecting faces. The prism may include first and second optical members of uniaxial crystal adhered to each other with optical axes thereof directed perpendicularly to each other or first and second optical members which define a polarizing splitting face on an interface therebetween. The light receiving element has two light receiving areas which are each divided into two or more circular or rectangular sections and individually receive split beams of light from the prism.

公开(公告)号：US4658391A

公开(公告)日：1987-04-14

申请号：US662149

申请日：1984-10-18

申请人： Shinsaku Nozu ,  Katsuharu Sato ,  Hozumi Tanaka ,  Kenjiro Hamanaka

发明人： Shinsaku Nozu ,  Katsuharu Sato ,  Hozumi Tanaka ,  Kenjiro Hamanaka

IPC分类号： G01M11/02 ,  G02B7/28 ,  G11B7/09

CPC分类号： G11B7/094 ,  G11B7/0909

摘要： A focus error detection device to be used in an optical system for recording and/or playing back information, including a light detector made up of four light receiving elements arranged symmetrically with respect to the center of the light detector, a first operation circuit means connected to the light receiving elements for generating a focus error signal, and a second operation circuit means also connected to the light receiving elements for generating an off-set compensation signal. With this construction, and off-set of the focus error signal due to the deviation of the position of the reflection light beam is by far reduced as compared with the conventional devices.

摘要翻译： 一种在用于记录和/或重放信息的光学系统中使用的聚焦误差检测装置，包括由相对于光检测器的中心对称布置的四个光接收元件构成的光检测器，连接的第一操作电路装置 涉及用于产生聚焦误差信号的光接收元件，以及还连接到光接收元件以产生偏移补偿信号的第二操作电路装置。 利用这种结构，与传统的装置相比，由于反射光束的位置的偏离导致的聚焦误差信号的偏离量远远减少。

公开(公告)号：US5124970A

公开(公告)日：1992-06-23

申请号：US465869

申请日：1990-01-16

申请人： Katsuharu Sato ,  Naoharu Yanagawa

发明人： Katsuharu Sato ,  Naoharu Yanagawa

IPC分类号： G11B7/135

CPC分类号： G11B7/1359

摘要： An optical head wherein a required astigmatism can be obtained readily to facilitate production thereof and the linear distance between a face of an information record medium and a light receiving element is reduced to reduce the overall size and weight of the optical head. The optical head comprises a prism having a parallelogram shape in side elevation. The prism has a reflecting/transmitting face extending at an angle of about 45 degrees with respect to an optical axis to the information record face for reflecting light from a light source toward the information record face, first and second reflecting faces extending perpendicularly to the optical axis for successively reflecting light transmitted thereto through the transmitting face, and a transmission face extending in parallel to the reflecting/transmitting face. Light emerging from the transmitting face of the prism is received and converted into an electrical signal by a light receiving element.

摘要翻译： 一种光学头，其中可以容易地获得所需的像散以便于其制造，并且信息记录介质的表面与光接收元件之间的直线距离减小，以减小光学头的总体尺寸和重量。 光学头包括侧视图中具有平行四边形形状的棱镜。 棱镜具有相对于光轴以约45度的角度延伸到信息记录面的反射/透射面，用于将来自光源的光朝向信息记录面反射，第一和第二反射面垂直于光学 轴，用于连续地反射通过透射面透射的光，以及平行于反射/透射面延伸的透射面。 从棱镜的透射面出射的光被光接收元件接收并转换为电信号。

公开(公告)号：US4429378A

公开(公告)日：1984-01-31

申请号：US249338

申请日：1981-03-31

申请人： Katsuharu Sato

发明人： Katsuharu Sato

IPC分类号： G02B5/04 ,  G02B27/00 ,  G02B27/28 ,  G11B7/08 ,  G11B7/12 ,  G11B7/135 ,  G11B7/1356 ,  G11B7/1365 ,  G11B7/00

CPC分类号： G11B7/1365 ,  G02B27/283 ,  G11B7/08 ,  G11B7/12 ,  G11B7/1356

摘要： An optical pickup device is placed in a video and/or audio disc player operative to reproduce information recorded in the form of an optical pattern such as a train of pits on a recording disc, in which the direction of light beam emitted from a light source is parallel to the propagation path of light impinging onto and reflected from the recording disc toward a photosensor. A polarization prism is used to deflect the light from the light source toward the recording disc, which prism cooperates with a quarter wave plate to act as a beam splitter.

摘要翻译： 光学拾取装置被放置在视频和/或音频盘播放器中，用于再现以记录盘上的诸如一系列凹坑的光学图案的形式记录的信息，其中从光源发射的光束的方向 平行于入射到记录盘上并从记录盘反射到光传感器的光的传播路径。 使用偏振棱镜将来自光源的光偏转到记录盘，该棱镜与四分之一波片配合以用作分束器。