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公开(公告)号：US4864118A
公开(公告)日：1989-09-05
申请号：US161820
申请日：1988-02-29
CPC分类号： G11B7/0901 , G11B7/085 , G11B7/13
摘要： A scanning unit for an optical disc record carrier includes a radiation-sensitive detection system having a plurality of detection elements on which is formed a reflected image of the scanning spot on the track structure of the record carrier. A tracking error signal is derived by combining the output signals of detection elements situated on respective sides of a boundary line between two halves of the detection system, and comparing with each other the combined signals from both halves. Several different such tracking error signals are derived, for boundary lines having different orietations with respect to the direction of the track instantaneously being scanned. The tracking error signal corresponding to a boundary line most nearly parallel to the direction of such track will be of greatest amplitude, and is selected as the tracking error signal used for controlling the scanning unit to follow the center line of such track. This achieves improved tracking error sensitivity providing more accurate tracking over the entire track structure.
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2.发明授权Optical recording and/or reproducing apparatus with optical sensing of scanning mirror position 失效具有扫描镜位置的光学感测的光学记录和/或再现装置
公开(公告)号：US5245182A
公开(公告)日：1993-09-14
申请号：US841607
申请日：1992-02-25
IPC分类号： G11B7/09
CPC分类号： G11B7/0925
摘要： A polygonal scanning mirror for an optical recorder is magnetically suspended and rotated about a scanning axis. To control position of the scanning mirror, a curved surface mirror is fixed with respect to, and rotates with, the scanning mirror for receiving a radiation beam and reflecting it onto a detector array. The reflected radiation beam is preferably focused by an astigmatic imaging system. Output signals from the detector array are used to control electromagnets of the suspension system.
摘要翻译： 用于光学记录器的多边形扫描镜被磁悬浮并围绕扫描轴旋转。 为了控制扫描镜的位置，弯曲表面镜相对于用于接收辐射束并将其反射到检测器阵列上的扫描镜固定并旋转。 反射的辐射束优选地通过散光成像系统聚焦。 来自检测器阵列的输出信号用于控制悬架系统的电磁铁。
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3.发明授权Apparatus for reading and/or writing an optically readable information structure 失效用于读取和/或写入光学可读信息结构的装置
公开(公告)号：US4423496A
公开(公告)日：1983-12-27
申请号：US214938
申请日：1980-12-10
CPC分类号： G11B7/0953 , G11B7/0904
摘要： An apparatus for reading and/or writing an optically readable information structure, arranged in information tracks, on a record carrier, comprises a beam deflection element which is controlled by a control signal obtained from a tracking servo system. The apparatus is provided with a position detection system for detecting the position of the deflection element, and the signal from this detection system is applied to an input of the servo system for generating a control signal which is independent of the position of the deflecting element.
摘要翻译： 用于读取和/或写入在记录载体上布置在信息轨道中的光学可读信息结构的装置包括由从跟踪伺服系统获得的控制信号控制的光束偏转元件。 该装置设置有用于检测偏转元件的位置的位置检测系统，并且来自该检测系统的信号被施加到伺服系统的输入端，用于产生独立于偏转元件的位置的控制信号。
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公开(公告)号：US4374324A
公开(公告)日：1983-02-15
申请号：US205554
申请日：1980-11-10
CPC分类号： G11B7/0917 , G11B7/0908 , G11B7/0956 , G11B2007/0924
摘要： In order to improve the focussing of radiation from a source onto an object, in example for a "VLP" or "Compact Disk" system, a further control signal from an object-inclination detector is added to the focussing error signal, yielding improved control stability and smaller focussing errors.
摘要翻译： 为了改善来自源到对象的辐射的聚焦，例如对于“VLP”或“光盘”系统，将来自物体倾斜检测器的另外的控制信号加到聚焦误差信号上，从而产生改善的控制 稳定性和较小的聚焦误差。
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5.发明授权Device for recording and/or reading information by means of a radiation beam, plate-shaped element suitable for use in the device, and disc player comprising the device 失效用于通过辐射束，适于在该装置中使用的板状元件记录和/或读取信息的装置，以及包括该装置的盘播放器
公开(公告)号：US5612945A
公开(公告)日：1997-03-18
申请号：US186399
申请日：1994-01-25
CPC分类号： G11B7/22 , G11B7/08582
摘要： An optical scanner for a disc placed on a turntable, having a scanning device mounted on a slide which is movable radially with respect to the turntable. The slide includes a body made of two thin plates which are parallel to each other and the direction of movement. The plates have patterns of raised portions which face each other. The plates are fixed to each other at locations where the raised portions contact each other.
摘要翻译： 一种用于放置在转台上的盘的光学扫描器，其具有安装在滑块上的扫描装置，其可相对于转台径向移动。 滑动件包括由彼此平行的两个薄板制成的主体和运动方向。 板具有彼此面对的凸起部分的图案。 这些板在凸起部分彼此接触的位置彼此固定。
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公开(公告)号：US5289442A
公开(公告)日：1994-02-22
申请号：US969918
申请日：1992-11-02
CPC分类号： G11B7/08564 , G11B7/08582
摘要： A device for optically scanning a surface (2) with a focal spot (11) formed by an objective lens (10). The objective lens is electromagnetically suspended in a stationary coil system (14) comprising a plurality of coil pairs located one behind the other in a given direction. The coil system can move the objective lens in five or six degrees of freedom. A radiation beam is displaced parallel to itself via a pivotal mirror (22) and a scanning lens (23) so as to track the movement of the objective lens in said direction. A communicator (96) drives only those coils of the coil system which are proximate to the objective system at a given moment.
摘要翻译： 一种用由物镜（10）形成的焦点（11）来光学扫描表面（2）的装置。 物镜被电磁悬挂在固定线圈系统（14）中，该固定线圈系统（14）包括在给定方向上一个接一个地定位的多个线圈对。 线圈系统可以以五或六个自由度移动物镜。 辐射束经由枢转反射镜（22）和扫描透镜（23）平行于其自身移位，以便沿着所述方向跟踪物镜的移动。 通信器（96）仅在给定时刻仅驱动线圈系统的接近物镜系统的线圈。
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公开(公告)号：US5014254A
公开(公告)日：1991-05-07
申请号：US285184
申请日：1988-12-15
IPC分类号： G11B11/10 , G11B11/105
CPC分类号： G11B11/10521 , G11B11/10513 , G11B11/1053 , G11B11/10536 , G11B11/10554 , G11B11/10576
摘要： A method and apparatus are revealed for recording information on a record carrier (1) having a magneto-optical recording layer (2), a pattern of magnetic domains (23, 24) having a first and a second direction of magnetization being formed in the recording layer (2). In accordance with the method, areas (22) of the recording layer are heated by the radiation pulses (20). The heated areas (22) are magnetized by means of a coil (12) which is energized with energizing-current pulses (21) which lag the radiation pulses (20) to such an extent that cooling of the areas (22) takes place substantially during the generation of the energizing pulses (12).
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公开(公告)号：US4773055A
公开(公告)日：1988-09-20
申请号：US119306
申请日：1987-11-06
CPC分类号： G11B7/0956 , G11B7/0925
摘要： An electro-optical apparatus comprising an objective (7) scans an optical disc (3) having a transparent protective layer (5) by means of a radiation beam (10) which, through the transparent layer, is focussed on a reflecting recording surface (4). The objective moves along the optical axis (19) for focussing the radiation beam on the recording layer and moreover performs limited pivotal movements. The position of the optical axis of the objective is corrected for obliquity of the surface of the optical disc, correction means (22A, B) being provided to tilt the objective through a correction angle, so that the angle between the optical axis and the normal to the disc surface is reduced.
摘要翻译： 一种电光设备，包括物镜（7）借助于辐射束（10）扫描具有透明保护层（5）的光盘（3），所述辐射束（10）通过所述透明层聚焦在反射记录表面 4）。 物镜沿着光轴（19）移动，用于将辐射束聚焦在记录层上，而且进行有限的枢转运动。 物镜的光轴的位置被校正为光盘的表面的倾斜度，校正装置（22A，B）被设置成通过校正角度倾斜物镜，使得光轴和法线之间的角度 到盘面减少。
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公开(公告)号：US5825740A
公开(公告)日：1998-10-20
申请号：US888143
申请日：1997-07-03
IPC分类号： G11B7/085 , G02B26/12 , G11B7/0025 , G11B7/003 , G11B7/08 , G11B7/09 , G11B7/095 , G11B7/133 , G11B7/1362 , G11B7/00
CPC分类号： G11B7/1362 , G11B7/0025 , G11B7/003 , G11B7/08 , G11B7/0901 , G11B7/133
摘要： A device for electromagnetically scanning information tracks on a record carrier, such as an optical tape, via a scanning beam is described. On this tape, information tracks are arranged substantially parallel and substantially transverse to a transport direction of the record carrier. The device is provided with a scanning unit for scanning, with the beam always following parallel scanning paths, and a control system for controlling an angle of the scanning paths with respect to the transport direction, dependent on a tilt signal. According to the invention, the device is provided with angle-measuring means for generating the tilt signal dependent on a tracking error signal which is indicative of a difference between a scanning path and the relevant information track. In addition to a tilt signal, a speed signal may also be derived from the tracking error signal. Both the tilt signal and the speed signal are derived from the tracking error signal in a captured and in a non-captured state of operation.
摘要翻译： 描述了一种用于通过扫描光束在诸如光学带的记录载体上电磁扫描信息轨道的装置。 在该磁带上，信息轨迹基本上平行并且基本上横向于记录载体的输送方向。 该装置设置有用于扫描的扫描单元，其中光束始终遵循平行扫描路径，以及用于根据倾斜信号控制扫描路径相对于传送方向的角度的控制系统。 根据本发明，该装置设置有角度测量装置，用于根据指示扫描路径和相关信息轨道之间的差异的跟踪误差信号产生倾斜信号。 除了倾斜信号之外，还可以从跟踪误差信号导出速度信号。 在捕获的和未捕获的操作状态下，倾斜信号和速度信号都来自跟踪误差信号。
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公开(公告)号：US5802033A
公开(公告)日：1998-09-01
申请号：US757533
申请日：1996-11-27
IPC分类号： G11B7/00 , G11B7/003 , G11B7/09 , G11B7/1362 , G11B3/74
CPC分类号： G11B7/1362 , G11B7/003 , G11B7/0901
摘要： An optical apparatus for scanning a tape-shaped record carrier, which apparatus uses a mirror polygon for scanning tracks extending perpendicularly to the tape travel direction. Since at least one facet, or a part thereof, of the mirror polygon extends at a different angle to the axis of rotation, the scanning spot is periodically moved transversely to the track direction, so that a tracking signal can be generated.
摘要翻译： 一种用于扫描带状记录载体的光学装置，该装置使用反射镜多边形来扫描垂直于磁带行进方向延伸的轨迹。 由于镜面多边形的至少一个面或其一部分与旋转轴线成不同的角度延伸，所以扫描光点周期性地沿轨道方向移动，从而可以产生跟踪信号。
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