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21. 发明授权

EP0203816B1 Optical disc drive apparatus 失效
标题翻译：光盘驱动器
公开(公告)号：EP0203816B1
公开(公告)日：1992-04-01
申请号：EP86304080.4
申请日：1986-05-29
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： Ishibashi, Hiromichi , Tanaka, Shinichi , Shimizu, Ryosuke , Kuwamoto, Makoto , Yamamoto, Hajime
IPC分类号： G11B7/135
CPC分类号： G11B7/135 , G11B7/08576 , G11B7/0941

22. 发明授权

EP0197666B1 Optical information-reproducing apparatus 失效
标题翻译：光信息 - 再现设备
公开(公告)号：EP0197666B1
公开(公告)日：1990-10-24
申请号：EP86301731.5
申请日：1986-03-11
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： Tanaka, Shinichi , Isaka, Haruo , Tanaka, Yuji
IPC分类号： G11B7/095
CPC分类号： G11B7/0948 , G11B7/0901

23. 发明公开

EP0232181A3 Digital information reproducing apparatus 失效
标题翻译：数字信息再现设备
公开(公告)号：EP0232181A3
公开(公告)日：1989-03-29
申请号：EP87301048.2
申请日：1987-02-05
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： Tanaka, Shinichi , Koudo, Toshikazu , Kushisaka, Tohru
IPC分类号： G11B20/10
CPC分类号： G11B20/10037 , G11B20/10009 , G11B20/10222 , G11B20/1426
摘要： In a digital information reproducing apparatus a digital signal having passed through a band-limited transmission system is waveform-shaped at a threshold level controlled to its optimal value so that the information can be properly read out. For this purpose, the apparatus is equipped with a threshold level control circuit for controlling the threshold level to shape the waveform of the input signal. This threshold level control circuit comprises a first control circuit (8, 10,11) for controlling the threshold level with reference to a read clock extracted from the input signal, and a second control circuit (5, 9, 10, 11) for controlling the threshold level of a shaped signal which is obtained by waveform-shaping the input signal so that the DC component of the shaped signal becomes a predetermined value. The control of the threshold level is performed by cooperation of the first (8,10,11) and second control circuits (5, 9, 10, 11). The first control circuit is adapted to control the threshold level in accordance with a difference between the shaped signal obtained by waveform-shaping the input signal and the read-out signal obtained by synchronizing the shaped signal with the read clock. Thus, the threshold level for waveform-shaping a modulated channel code signal can be controlled optimally regardless of whether the modulation system is DC-free or not. The second control circuit serves to prevent spurious lock of the first control circuit.

24. 发明公开

EP0178813A3 Method and apparatus for encoding binary data 失效
标题翻译：编码二进制数据的方法和装置
公开(公告)号：EP0178813A3
公开(公告)日：1989-03-15
申请号：EP85306961.5
申请日：1985-09-30
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： Tanaka, Shinichi
IPC分类号： G11B20/14 , G11B20/10 , H03M5/14
CPC分类号： H03M5/145
摘要： Method and apparatus for encoding binary data. This method comprises the steps of converting data words each containing N data bits to channel words each containing M data bits, and producing NRZI code data from the channel words. In the converting step, a data word is not converted in real time when the data word has a specific data bit pattern or when the data word is in a specific relation to adjacent data words. This unconverted data word is converted to an established channel word which is so determined to reduce DSV at a time when a predetermined number of data words which are convertible in real time have been inputted or when another data word which should be maintained unconverted has been inputted again. The established channel word is outputted after at least a delay time which is required to convert the unconverted data word to the established channel word.

25. 发明公开

EP0238162A3 Optical information reproducing apparatus 失效
标题翻译：光学信息重放装置
公开(公告)号：EP0238162A3
公开(公告)日：1988-06-22
申请号：EP87300310
申请日：1987-01-15
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： Tanaka, Shinichi , Isaka, Haruo , Yasuda, Hiroshi , Itoi, Oshiki
IPC分类号： G11B07/09
CPC分类号： G11B7/094 , G11B7/0901 , G11B7/0909
摘要： Disclosed herein is an optical information reproducing apparatus having a phase difference tracking system which is free from an influence of a tangential phase different of output signals from a photodetector. The photodetector comprises first through fourth photocells which are respectively disposed at first through fourth quadrants defined by a first straight line parallel to an information track image and a second straight line perpendicular to the first straight line. Output signals of the first and second photocells are delayed for a specified time by respective first and second delaying circuits. Output signals of the first delaying circuit and the third photocell are added by a first adder, and output signals of the second delaying circuit and the fourth photocell are added by a second adder. A phase comparator produces a tracking error signal from a phase difference between output signals of the first and second adders. Alternatively, a first phase comparator produces a phase difference between the output signals of the first and second photocells, and/or a second comparator produces a phase difference between the output signals of the third and fourth photocells. At least one of output signals of the first and second comparator is used for producing a tracking error signal.
摘要翻译：本文公开了一种具有相位差跟踪系统的光学信息再现设备，该系统不受来自光电检测器的输出信号的不同切向相位的影响。光检测器包括第一至第四光电池，其分别设置在由平行于信息轨道图像的第一直线和垂直于第一直线的第二直线限定的第一至第四象限中。第一和第二光电池的输出信号由相应的第一和第二延迟电路延迟指定的时间。第一延迟电路和第三光电管的输出信号由第一加法器相加，第二延迟电路和第四光电管的输出信号由第二加法器相加。相位比较器根据第一和第二加法器的输出信号之间的相位差产生跟踪误差信号。或者，第一相位比较器在第一和第二光电池的输出信号之间产生相位差，和/或第二比较器在第三和第四光电池的输出信号之间产生相位差。第一和第二比较器的至少一个输出信号用于产生跟踪误差信号。

26. 发明公开

EP0087290A1 Tape recorder 失效
标题翻译：磁带录音机
公开(公告)号：EP0087290A1
公开(公告)日：1983-08-31
申请号：EP83300855.0
申请日：1983-02-18
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： Ueno, Shigeto , Ohnishi, Masanori , Nakamura, Yuji , Tanaka, Shinichi
IPC分类号： G11B15/62
CPC分类号： G11B15/62 , G11B15/60
摘要： A magnetic head is fixedly mounted on the cassette holder in a cassette tape recorder. When a taper cassette is inserted into the cassette holder, a magnetic tape is brought into contact with the front face of the magnetic head through an access opening in the tape cassette. In response to selection of stop, fast-forward, and rewind modes of operation, a pad shifter disposed on the cassette holder adjacent to the magnetic head is moved to displace a pad in the tape cassette out of pressed contact with the magnetic tape. When in a recording or playback mode of operation, the pad shifter is retracted to allow the pad to resiliently press the magnetic tape against the magnetic head. The tape recorder is rendered small in size particularly in the transverse direction of the tape cassette inserted.
摘要翻译：磁带盒固定在盒式磁带录音机上。当锥形磁带盒插入磁带盒支架时，磁带通过磁带盒中的存取开口与磁头的前表面接触。响应于停止，快进和倒带操作模式的选择，设置在磁带托架上与磁头相邻的移架移位器移动，以使磁带盒中的一个衬垫脱离与磁带的压紧接触。当处于记录或重放操作模式时，移动垫移位器缩回以允许垫弹性地将磁带按压在磁头上。磁带录像机的尺寸特别小，特别是在插入的磁带盒的横向方向上。

28. 发明公开

EP1327985A3 Tracking error signal detection apparatus and magnetic recording apparatus 失效
标题翻译：装置用于检测寻道信号和磁记录装置
公开(公告)号：EP1327985A3
公开(公告)日：2004-01-21
申请号：EP03006706.0
申请日：1996-07-09
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
发明人： Kadowaki, Shin-ichi , Tanaka, Shinichi , Nishiwaki, Seiji , Sano, Kousei , Nishino, Seiji
IPC分类号： G11B21/10 , G11B5/596 , G11B7/09
CPC分类号： G11B5/59627 , G11B5/016 , G11B5/5556 , G11B5/5565 , G11B5/59677 , G11B7/0903 , G11B7/0941
摘要： In a magnetic recording medium to detect tracking error signals optically where an optical head and a magnetic head scan different tracks, two signals having phases different by π /2 are generated and added or subtracted. By changing the amplitude of the two signals with a changeable gain amplifying means, a phase of a tracking error signal is changed so that the servo operation is conducted at the middle of the amplitude of the tracking error signal to keep the magnetic head on track.

29. 发明授权

EP0753851B1 Information recording medium and tracking error signal detection apparatus and magnetic recording apparatus and method of adjusting the magnetic recording apparatus 失效
标题翻译：信息记录介质和装置用于检测轨道的寻求信号和磁性记录装置和方法，用于设置磁记录装置
公开(公告)号：EP0753851B1
公开(公告)日：2003-10-01
申请号：EP96111030.1
申请日：1996-07-09
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
发明人： Kadowaki, Shin-ichi , Tanaka, Shinichi , Nishiwaki, Seiji , Sano, Kousei , Nishino, Seiji
IPC分类号： G11B21/10 , G11B21/12 , G11B5/596 , G11B7/09 , G11B7/095
CPC分类号： G11B5/59627 , G11B5/016 , G11B5/5556 , G11B5/5565 , G11B5/59677 , G11B7/0903 , G11B7/0941

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