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公开(公告)号：US5224083A
公开(公告)日：1993-06-29
申请号：US556000
申请日：1990-07-16
IPC分类号： G11B7/085
CPC分类号： G11B7/085
摘要： From the start of descending of a disk-shaped recording medium in a direction of approaching an objective lens in the optical axis direction by a loading mechanism until it is set at a specified position with respect to a spindle motor, a DC current is supplied to an optical axis direction driving coil through an evading current feeding circuit in a direction for a movable part to depart from the disk-shaped recording medium, and the movable part is located at the remotest position from the disk-shaped recording medium due to an electromagnetic force generated by the DC current flowing in the optical axis direction driving coil and a permanent magnet, so that the disk-shaped recording medium and the objective lens will not collide against each other even if an objective lens with a short working distance is used.
摘要翻译： 从盘状记录介质的下降开始，通过加载机构在光轴方向上接近物镜的方向下降到相对于主轴电机的规定位置为止，直流电流被供给到 光轴方向驱动线圈，其通过避让电流馈送电路沿着可移动部分的方向离开盘状记录介质，并且可移动部分由于电磁场位于盘形记录介质的最远位置 由于在光轴方向驱动线圈上流过的直流电流产生的力和永久磁铁，即使使用了短工作距离的物镜，盘状记录介质和物镜也不会相互碰撞。
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公开(公告)号：US5150350A
公开(公告)日：1992-09-22
申请号：US403446
申请日：1989-09-06
申请人： Hideki Aikoh , Tohru Nakamura , Masayuki Shinoda , Noboru Kikuchi
发明人： Hideki Aikoh , Tohru Nakamura , Masayuki Shinoda , Noboru Kikuchi
IPC分类号： G11B11/10 , G11B7/09 , G11B7/135 , G11B11/105
CPC分类号： G11B7/1356 , G11B11/10576 , G11B7/0901 , G11B7/1359
摘要： A magneto-optical data recording and reproducing device for storing data in a data memory medium which applies modulation to a plane of polarization, erasing data therefrom and reproducing data stored therein, comprises a light source for emitting a light beam with linear polarization, a light spot forming means for condensing the light beam emitted from the light source and forming a light spot on the data memory medium, a beam splitting means, located between the light source and the light spot forming means, to which reflected light beams from the data memory medium are applied and splitted, a beam detecting prism, to which light beams splitted by the beam splitting means are applied, providing the polarizing function that a predetermined first pencil of light beam with linear polarization is reflected while a second pencil of light beam with linear polarization crossing the first pencil at right angles is transmitted, a beam splitting prism, being located near or adhered to the beam detecting prism, for splitting the second pencil of light beam with linear polarization transmitted through the beam detecting prism into two subpencils with approximately the same quantity of light, reflecting the splitted subpencils and then re-allying them to the beam detecting prism to form two optical axes extending along approximately the same direction as that of the first pencil of light beam with linear polarization, at least one or more photo detector to which a plurality of light beams having passed through the beam detecting prism and the beam splitting prism are applied, a data retrieval unit for retrieving data in the data memory medium according to output of the photo detector, a tracking servo unit to which a tracking error signal picked up by the output of the beam detector is applied, and a driving means for driving at least the light spot forming means in response to an output signal from the tracking servo unit.
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13.发明授权
公开(公告)号：US5170384A
公开(公告)日：1992-12-08
申请号：US475943
申请日：1990-02-06
申请人： Yasuaki Edahiro , Noboru Kikuchi , Akira Kurahashi
发明人： Yasuaki Edahiro , Noboru Kikuchi , Akira Kurahashi
IPC分类号： G11B7/085
CPC分类号： G11B7/08517
摘要： A tracking control apparatus of an optical signal recording/reproduction apparatus, records and reproduces a data signal by causing a light spot focused on an optical recording medium to trace data-recording tracks and then accesses the light spot to a desired track. The tracking control apparatus varies a tracking-servo target value in a direction of performing the track-jumping operation, and then, if the tracking error signal exceeds a predetermined position level, the tracking control apparatus repeatedly varies the polarity of the tracking error signal until the light spot eventually arrives at the target track subject to the track-jumping operation. By virtue of the structure mentioned above, the tracking control apparatus can stably perform the track-jumping operation even when external disturbances, such as vibration, occur in the servo system.
摘要翻译： 光信号记录/再现装置的跟踪控制装置通过使聚焦在光记录介质上的光点跟踪数据记录轨道，然后将光点存取到期望的轨道来记录和再现数据信号。 跟踪控制装置在执行轨道跳跃操作的方向上改变跟踪伺服目标值，然后如果跟踪误差信号超过预定位置电平，则跟踪控制装置重复地改变跟踪误差信号的极性，直到 光点最终到达轨道跳跃操作的目标轨道。 通过上述结构，即使在伺服系统中发生振动等外部干扰的情况下，跟踪控制装置也能够稳定地进行轨道跳跃动作。
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14.发明授权Data recording/reproducing apparatus with two-dimensional equalizer for crosstalk cancellation 失效数据记录/再生装置与二维均衡器进行CROSSTALK CANCELLATION
公开(公告)号：US5166914A
公开(公告)日：1992-11-24
申请号：US454501
申请日：1989-12-21
IPC分类号： G11B7/0037 , G11B11/105 , G11B20/10 , G11B20/22
CPC分类号： G11B20/10037 , G11B11/10515 , G11B11/1053 , G11B11/10576 , G11B20/10 , G11B20/10009 , G11B20/10046 , G11B20/10222 , G11B20/22 , G11B7/0037
摘要： An equalizer apparatus is applied to a DBF disk recording medium in which a sampling clock is reproduced from clock pits recorded on the disk recording medium. A fixed coefficient equalizer includes an analog to digital converter, a memory and a two-dimension equalizer. The fixed coefficient equalizer suppresses interference from adjacent tracks and reduces the error rate of the reproduced data caused by crosstalk even in the case of a narrow track pitch. Further, by adding to the equalizer a sign detector, a FIR low-pass filter and a coefficient control circuit to form a variable coefficient equalizer, interference fluctuation attributed to the linear recording density, recording power irregularity, light spot shape, tracking error, etc., can be automatically compensated to suppress the equalization error caused by such fluctuation. Further, using the variable coefficient equalizer, clocking timing errors and fluctuations can be automatically and efficiently compensated.
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公开(公告)号：US5146445A
公开(公告)日：1992-09-08
申请号：US559912
申请日：1990-07-30
申请人： Tohru Nakamura , Hideki Aikoh , Masayuki Shinoda , Noboru Kikuchi
发明人： Tohru Nakamura , Hideki Aikoh , Masayuki Shinoda , Noboru Kikuchi
CPC分类号： G11B7/133 , G11B7/0901 , G11B7/094
摘要： An optical head equipped with a tracking error detector to obtain a tracking error signal for tracking servo. The detector includes a photodetector having a light-detecting region on which a light spot with a predetermined diameter is formed by a reflected light beam from a recording medium. The region is divided by a first division line into two which are further divided by second and third division lines so as to form first to fourth subregions, the first and second subregions being adjacent to each other with the first division line being interposed therebetween, the third subregion being adjacent to the first subregion, and the fourth subregion being adjacent to the second subregion. The separation between the second and third division lines is determined so that the sum of the light receiving quantities of the first and fourth subregions is substantially equal to the sum of the light receiving quantities of the second and third subregions when the objective lens is shifted from its neutral position. Electric signals produced in correspondance with the light receiving quantities are supplied to a differential amplifier to take a difference between a sum signal of the signals due to the first and fourth subregions and a sum signal of the signals due to the second and third subregions.
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公开(公告)号：US5057945A
公开(公告)日：1991-10-15
申请号：US531430
申请日：1990-05-31
CPC分类号： G11B5/09 , G11B20/10 , G11B20/22 , G11B21/003 , G11B5/012 , G11B5/4886
摘要： A signal recording/reproducing apparatus equipped with a recording head section for recording signals on a recording medium and a reproducing head section for reproducing the signals recorded on the recording medium. The recording head section is arranged to record the signal to form N recording sub-tracks on the recording medium and the reproducing head section has M reproducing sub-heads which trace the N recording sub-tracks to reproduce the recording signal. The pitch of the M sub-heads thereof is equal to a pitch of the recording sub-tracks and the number M of the sub-heads is greater than the number N of the recording sub-tracks. The reproducing head section is coupled to a reproduction signal detecting section which is turn eliminates the interference and the crosstalk between adjacent tracks from the reproduced signal due to the reproducing head section. This arrangement allows narrowing the track pitch to increase the recording capacity and extremely improving the transfer rate concurrently with the elimination of the interference between the adjacent codes and crosstalk between the adjacent tracks.
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公开(公告)号：US5056116A
公开(公告)日：1991-10-08
申请号：US357737
申请日：1989-05-26
CPC分类号： G11B20/10037 , G11B20/1426
摘要： A data demodulation apparatus applicable to a playback input signal from a digital recording apparatus, which executes A/D conversion of the input signal with a sampling period that is equal to the bit separation of that signal, and obtains phase data for reproducing the phase of the clock signal component of the input signal each time that a "1" state bit is detected in a sampling period. For each sampling period, or set of successive sampling periods, data values are derived which respectively represent a number of bit positions of the input signal within that period and the presence or absence of "1" state bits in the period, and these data values are converted to serial form to respectively constitute a reproduced clock signal and a detected data signal.
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公开(公告)号：US4657417A
公开(公告)日：1987-04-14
申请号：US716179
申请日：1985-03-26
IPC分类号： B41J25/316 , B41J3/20 , B41J23/00
CPC分类号： B41J25/316
摘要： Disclosed is a thermal printer which comprises a thermal head mounted on a carriage and movable relative to a platen having recording paper wound partially therearound, and a carriage guide plate carrying the carriage, and pivoted so as to separate the thermal head from the platen. A cam mechanism is provided for pivoting the carriage guide plate, and a cam operation mechanism driven by the motor is provided for operating the cam mechanism.
摘要翻译： 公开了一种热敏打印机，其包括安装在托架上的热敏头，并且相对于具有部分卷绕在其上的记录纸的台板可移动的热敏头，以及承载滑架的托架引导板，并且枢转以将热敏头与压板分离。 设置有用于使滑架导板枢转的凸轮机构，由马达驱动的凸轮操作机构用于操作凸轮机构。
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