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1. 发明公开

EP0177263A2 Automatic tracking apparatus 失效
标题翻译： Automatische Spurnachlaufvorrichtung。
公开(公告)号：EP0177263A2
公开(公告)日：1986-04-09
申请号：EP85306825.2
申请日：1985-09-25
申请人： SONY CORPORATION
发明人： Sakamoto, Hitoshi c/o Sony Corporation , Okafuji, Takayuki c/o Sony Corporation
IPC分类号： G11B5/592
CPC分类号： G11B5/5508 , G11B5/592
摘要： An automatic tracking apparatus for use in a video tape recorder including a magnetic head mounted on a piezo-electric element. The automatic tracking apparatus includes a driving pulse generator which generates a driving pulse signal causing the piezo-electric element to drive the magnetic head. The driving pulse signal has a waveform including a jumping portion causing the magnetic head to jump from one recording track to another recording track, which generates ringing vibrations in the piezo-electric element in a change-speed reproduction mode. An inflection point is imposed on the jumping portion of the driving pulse signal waveform. The position of the inflection point is determined in accordance with the amplitude level of the ringing vibrations so as to minimize the amplitude level of the ringing vibrations.
摘要翻译：一种用于录像机的自动跟踪装置，包括安装在压电元件上的磁头。自动跟踪装置包括驱动脉冲发生器，其产生使压电元件驱动磁头的驱动脉冲信号。驱动脉冲信号具有波形，其包括使磁头从一个记录轨迹跳到另一个记录轨道的集中部分，其在变速再现模式中产生压电元件中的振动振动。对驱动脉冲信号波形的跳跃部分施加拐点。拐点的位置根据振动振动的振幅水平来确定，以使振铃振动的振幅水平最小化。

2. 发明授权

EP0039915B1 Head tracking control system 失效
标题翻译：头跟踪控制系统
公开(公告)号：EP0039915B1
公开(公告)日：1984-02-15
申请号：EP81103491.7
申请日：1981-05-07
申请人： SONY CORPORATION
发明人： Sakamoto, Hitoshi c/o Sony Corporation
IPC分类号： G11B5/52 , G11B5/55 , G11B5/58
CPC分类号： G11B5/588

3. 发明授权

EP0177263B1 Automatic tracking apparatus 失效
标题翻译：自动跟踪装置
公开(公告)号：EP0177263B1
公开(公告)日：1991-01-16
申请号：EP85306825.2
申请日：1985-09-25
申请人： SONY CORPORATION
发明人： Sakamoto, Hitoshi c/o Sony Corporation , Okafuji, Takayuki c/o Sony Corporation
IPC分类号： G11B5/592
CPC分类号： G11B5/5508 , G11B5/592

4. 发明公开

EP0039915A1 Head tracking control system 失效
标题翻译：跟踪系统的扫描头。
公开(公告)号：EP0039915A1
公开(公告)日：1981-11-18
申请号：EP81103491.7
申请日：1981-05-07
申请人： SONY CORPORATION
发明人： Sakamoto, Hitoshi c/o Sony Corporation
IPC分类号： G11B5/52 , G11B5/55 , G11B5/58
CPC分类号： G11B5/588
摘要： A video tape recording/reproducing apparatus for reproducing rideo signals recorded in successive parallel tracks on a magnetic tape includes a magnetic head (14) for scanning the tracks to reproduce the signals recorded therein: a bi-morph leaf (16) for deflecting the head in a direction transverse to the direction along the tracks; a controllable oscillator (24) for supplying a wobbling signal to the bi-morph leaf (16) so as to control the latter to deflect the head to oscillate in a transverse direction with respect to the tracks, wherein the signals reproduced by the head (14) are amplitude modulated at the frequency of the wobbling signal; a tracking error detecting loop for supplying a tracking error signal, corresponding to deviation of the head (14) from the respective track being scanned, to the bi-morph leaf (16) so as to control the latter to correct the deviation; and. a signal detecting loop for detecting the fundamental and second harmonic components of the amplitude modulated signals reproduced by the head and for controlling the amplitude of the wobbling signal from the controllable oscillator (24) in response to a ratio of the levels of the second and fundamental harmonic components so asto reduce the amplitude of the wobbling signal for small tracking errors and to increase the amplitude of the wobbling signal for large tracking errors.

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