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公开(公告)号：EP0242887A3
公开(公告)日：1988-01-07
申请号：EP87106964
申请日：1983-11-02
Applicant: NEC CORPORATION
Inventor： Tanaka, Hideo c/o NEC Corporation
IPC: G11B05/58 , G11B05/31 , G11B05/39 , G11B05/596
CPC classification number: G11B5/3903 , G11B5/3103 , G11B5/3116 , G11B5/58 , G11B5/5965
Abstract: The magnetic recorder has a pair of first and second transducers (5a,5b) arranged in the longitudinal direction of a record track (6). The magnetic recorder exchanges signals with a magnetic record medium (1) having a servo control signal prerecorded in a lower layer (3a) of said medium (1). A recording circuit (8) is connected to the first transducer (5a) for recording a data signal along the record track (6) in an upper layer (3b) of the medium (1). A reading circuit (9,10) is connected to one of the first and second transducers (5a,5b) for reading the recorded data signal. The second transducer (5b) is connected to a servo control circuit connected for reading the prerecorded servo control signal (12 to 15) and deriving therefrom a position error signal in response to which the position of the transducers (5a,5b) is controlled.
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公开(公告)号：EP0103463A3
公开(公告)日：1986-11-20
申请号：EP83305226
申请日：1983-09-07
Applicant: AMPEX CORPORATION
Inventor： O'Gwynn, David C.
CPC classification number: G11B15/4675 , G11B5/588 , G11B15/1875
Abstract: A new automatic tracking method is disclosed for the accurate positioning of a magnetic head with information previously recorded on the magnetic tape. If a moveable magnetic head is used, the position thereof is first normalized. Thereafter tracking is automatically adjusted based on a repetitive sampling process in which the results are mathematically averaged to determine a precise center position. Finally, new video material is physically positioned on the magnetic track according to a single offset error measurement.
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33.发明公开Apparatus for controlling the tracking position of a head in an apparatus for recording or reproducing information 失效用于控制记录或复制信息的装置中的头部的跟踪位置的装置
公开(公告)号：EP0089816A3
公开(公告)日：1985-12-18
申请号：EP83301497
申请日：1983-03-17
Applicant: SONY CORPORATION
Inventor： Yasuda, Yukihiro , Yoshioka, Hiroshi , Takahashi, Takao
CPC classification number: G11B21/103 , G11B15/1808 , G11B17/34
Abstract: In an apparatus for controlling a tracking position of magnetic head which reproduces parallel tracks sequentially formed on magnetic tape, the parallel tracks containing a video signal and a pilot signal having mutually different frequencies changing in cyclic sequence from track to track, a pair of control signals are generated in response to amplitudes of the reproduced pilot signals, said pair of control signals (S21 & S22) are generated in response to of the head from the track to be traced, and a tracking error signal (S17) is formed by mixture of the pair of control circuits to control the tracking position in response to said tracking error signal. The magnitudes of the pair of control signals (S21 & S22) are independently controlled according to the desired tracking position of the head so that the head can track at a location offset from a central track.
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公开(公告)号：EP0094194A3
公开(公告)日：1985-10-30
申请号：EP83302504
申请日：1983-05-04
Applicant: Matsushita Electric Industrial Co., Ltd.
Inventor： Yamada, Koichi , Kubo, Kanji , Nishitani, Yasuo
CPC classification number: H04N5/93 , G11B5/588 , G11B15/1808
Abstract: A magnetic recording and reproduction system of helical scan type is disclosed. During the recording process, pilot signals (f,p, f 2 p, f 3 p, f 4 p) for reproduction tracking control are sequentially recorded by the rotary magnetic head in recording tracks in proximity to each other in superimposed relation with the television signal to be recorded. During the normal reproduction process, from the level difference between the crosstalk signals of the pilot signals reproduced from the recording tracks to be reproduced, a tracking error is detected to control the relative positions of the recording track and the reproduction scanning traces of the reproduction magnetic head. During the reproduction process at a speed different from that for recording, on the other hand, a pulse signal is produced at a time point when the crosstalk levels of the pilot signals reproduced from the tracks adjacent to the recording track to be reproduced coincide with each other. This pulse signal is used to maintain a predetermined positional relation between the recording track and the reproduction scanning traces of the reproduction magnetic head thereby to produce a superior reproduced image.
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公开(公告)号：EP0102826A3
公开(公告)日：1985-05-02
申请号：EP83305021
申请日：1983-08-31
Applicant: SONY CORPORATION
Inventor： Nemoto, Shoji , Yoshioka, Hiroshi
CPC classification number: G11B15/4678 , G11B15/1875
Abstract: In an apparatus for controlling a tracking position of magnetic head which reproduces parallel tracks serially formed on magnetic tape, the parallel tracks containing a video signal and a pilot signal having mutually different frequencies changing in cyclic sequence from track to track, there is generated a reference pilot signal having the same frequencies as the frequencies of the pilot signal reproduced from the track, and the frequency of the reference pilot signal associated with one track is subtracted from the frequencies of the pilot signals reproduced from the tracks adjacent to the one track to produce a control signal indicative of displacement from the one track to be reproduced. The pilot signal generating means alternatively generates first and second reference pilot signals having the same frequencies as that of the pilot signals which are recorded in a pair of tracks to be reproduced in still picture reproducing mode.
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Patent Agency Ranking
公开(公告)号：EP0089645A3
公开(公告)日：1983-11-30
申请号：EP83102709
申请日：1983-03-18
Applicant: Hitachi, Ltd.
Inventor： Kawase, Hideyuki
CPC classification number: G11B5/56
Abstract: A magnetic head adjusting mechanism operable to adjust the position of magnetic heads (2, 3) with respect to the direction of the run of a web (1) of a magnetic recording medium in dependently of the adjustments of the head gap angle, the heights of the heads and other adjustment items. The mechanism includes a head base plate (19) carrying the magnetic heads (2, 3) and formed with a shaft bore in which is fitted a support shaft (14) mounted on a chassis (22). The head base plate (19) is resiliently biased about the axis of the support shaft (14). The rotation of the head base plate (19) about the support shaft (14) is limited by a tapered adjusting member formed by a tapered nut (17) having a conical outer surface in contact with the head base plate (19) and a screw shaft (21) in threadable engagement with the tapered nut. The screw shaft (21) is mounted on and extends from the chassis (22) to support the tapered nut such that the generating line of the conical surface of the nut, which includes the point of contact of the nut (17) with the head base plate (19), is substantially parallel to the axis of the support shaft (14).
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公开(公告)号：EP0081916A3
公开(公告)日：1983-10-05
申请号：EP82306097
申请日：1982-11-16
Inventor： Sellars, Graham Paul
IPC: G11B05/58
CPC classification number: G11B5/58 , G11B5/59622
Abstract: A self-sealing differential signal decoder (50) which accepts first and second input signals and provides an output representative of the difference therebetween which is scaled as if the sum of the input signals were equal to a predetermined value, avoids slow A.G.C. systems and sequence control systems, being operable at up to video speed by exploiting the properties of a differential long-tail pair amplifier (72, 74, 76) where the ratio between its output currents is proportional to the antilogarithm of the difference between its input voltages and the sum of the output currents is equal to the controlled value of a constant current source (76), the input to the long-tail pair being provided by a differential logarithmic amplifier (56, 58, 66, 68) and the decoder (50) being employed in a tribit servo signal reader.
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公开(公告)号：EP0056712A3
公开(公告)日：1982-08-11
申请号：EP82300203
申请日：1982-01-15
Applicant: Matsushita Electric Industrial Co., Ltd.
Inventor： Tanaka, Shinichi , Hirose, Namio
CPC classification number: G11B21/10 , G11B7/0904
Abstract: An information read apparatus with tracking control system comprises a first closed loop and a second closed loop. The first closed loop performs precise tracking control with the aid of tracking error detection by wobbling the reading position on the information carrier in a direction traverse to the information track being read. The second closed loop performs feedback compensation for damping the tracking control system, with the aid of a means for detecting velocity (aided by the tracking error detection) without excess frequency dependency. The first closed loop is dominant only in the low frequency region. Since the second closed loop is negligible in comparison with the first closed loop near the cross-over frequency of the tracking control system, phase lag of the second closed loop is alinwable about said cross-over frequency Therefore, the wobbhng frequency can be selected so low that the same actuator that controls the global reading position can be used for wobbling. In this way, the tracking control system performs both high precision control and high speed control
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公开(公告)号：EP0213875A3
公开(公告)日：1987-11-11
申请号：EP86306402
申请日：1986-08-19
Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY
IPC: G11B05/58 , G11B05/187
Abstract: A recording head and support arm assembly (14, 16) for use with a stretched surface recording disk (12) which maintains the recording head (14) in proper attitudinal relationship to the disk (12).
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40.发明公开
公开(公告)号：EP0131316A3
公开(公告)日：1987-07-29
申请号：EP84200349
申请日：1984-03-12
Applicant: N.V. Philips' Gloeilampenfabrieken
Inventor： Hoogendoorn, Abraham , Kuchar, Franz
IPC: H04N09/491 , G11B05/00 , G11B05/58
CPC classification number: G11B5/588 , G11B15/026 , G11B15/1875 , G11B15/4733
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