公开(公告)号：EP0240745A3

公开(公告)日：1987-11-19

申请号：EP87103291

申请日：1984-08-30

Applicant: MEMOREX CORPORATION

Inventor： El-sadi, Ibrahim

IPC: G11B21/10 ,  G11B21/08 ,  G11B05/596 ,  G11B05/55 ,  G11B20/12

CPC classification number: G11B21/085 ,  G11B5/59688 ,  G11B21/106

Abstract: Shown is a disk drive arrangement with servo- mechanism for controlling (thin-film) head position, etc.; the servo having a disk face dedicated to servo tracks, rendered in "Quad" code, with special timing indicia to separate position indicia. A feature is a technique for deriving and using "offset" values for an array of servo tracks.

Abstract translation: 显示了具有用于控制（薄膜）头位置等的伺服机构的磁盘驱动装置; 伺服具有专用于伺服轨道的盘面，以“Quad”代码呈现，具有特殊的时间标记以分离位置标记。 特征是用于导出和使用伺服轨道阵列的“偏移”值的技术。

公开(公告)号：EP0194641A3

公开(公告)日：1987-11-11

申请号：EP86103223

申请日：1986-03-11

Applicant: SONY CORPORATION

Inventor： Yada, Hiroaki c/o Sony Corporation ,  Imakoshi, Shigeyoshi c/o Sony Corporation ,  Suyama, Hideo c/o Sony Corporation ,  Sekiya, Tetsuo c/o Sony Corporation ,  Nakayama, Masayuki c/o Sony Corporation

IPC: G11B05/596 ,  G11B21/10

CPC classification number: G11B5/59655

Abstract: A servo system for positioning a data transducer head - (2) relative to a plurality of substantially concentric data tracks (DT) on the surface of a magnetic disc (1) including a pair - (3) of servo transducer heads (3a, 3b) for sensing the data tracks (DT) and generating output signals representative of a data signal written on the sensed track (DT), a distance (S) between the servo transducer heads (3a, 3b) of said pair (3) being related to the dimension (W) of the data track (DT) 20 and a distance between the servo transducer heads (3a, 3b) and the data transducer head (2) being related to a data track pitch (T), a signal processing circuit ( 5 to 15, 30, 32, 33, 34) connected to the pair (3) of servo transducer heads - (3a, 3b) for generating a data transducer head positioning signal and a positioning device (27, 28) for positioning the data transducer head (2) in response to the transducer positioning signal and for maintaining the track centerline in alignment with the data transducer head (2).

公开(公告)号：EP0166461A3

公开(公告)日：1987-05-20

申请号：EP85108976

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B20/10 ,  G11B05/09 ,  G11B05/596 ,  G11B21/10

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

Abstract: A method for writing a clock track on a magnetic storage medium of a disc system comprising a fixed read/write head, at least one moving read/write head, and means for translating the magnetic storage medium relative to the fixed and the moving heads, whereby information may be written on the medium in the form of magnetic transitions and the magnetic transitions may be read with the fixed and the moving heads, includes the steps of writing a single pair of transitions with the fixed heads, selecting a predetermined number N of transition pairs for a clock track, reading the single pair of transitions to create a single initial electrical pulse, phase-lock looping the initial electrical pulse to a number of electrical pulse to a number of electrical pulses approximately equal to the square root of N, writing an intermediate clock track with the moving head, the intermediate clock track having a number of transition pairs equal to the square root of N, reading the intermediate clock track to create a number of intermediate clock electrical pulses equal to the square root of N, phase-lock looping the intermediate clock electrical pulses to a number of electrical pulses equal to N and writing a clock track with the fixed head having N transition pairs.

公开(公告)号：EP0154085A3

公开(公告)日：1987-03-25

申请号：EP84308193

申请日：1984-11-26

Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA

Inventor： Mizuno, Masahiro ,  Baba, Hiroshi ,  Kanemaru, Shoji Shimokurata Danchi No. 5-503

IPC: G11B05/596 ,  G11B21/10

CPC classification number: G11B5/59616

Abstract: 57 A disk device for positioning a magnetic head 3 which has a magnetic disk 1 and a magnetic head for reading/ writing information on a plurality of data tracks 10 on the disk, an actuator 5 for moving the head in a direction crossing the data tracks, positioning control means 8 for positioning of the head by controlling the actuator, positioning compensating control means 17 for compensating the; position displacement of the head by controlling the positioning control means on the basis of an input, in which position information means 12,13 of predetermined pattern for applying difference pieces of information to the head is provided, in dependence on the radial position displacement of the head from the central position of the data track, to supply the position information output from the head to the position displacement compensating control means on the basis of the timing from an index timing sensor 7PA for detecting the position information. The position information may be on all the tracks, or only the innermost and outermost tracks with intermediate tracks being compensated by interpolation. Similar position information may be used to distinguish data tracks from guard tracks and thus to detect track No. 0 as a reference track.

公开(公告)号：EP0152070A3

公开(公告)日：1988-03-09

申请号：EP85101312

申请日：1985-02-07

Applicant: TEAC CORPORATION

Inventor： Shoji, Makoto ,  Tsuyuguchi, Hiroshi ,  Toma, Shozo ,  Hiraki, Kazuhiro ,  Morita, Tsutomu

IPC: G11B19/10 ,  G11B19/20 ,  G11B21/02 ,  G11B17/00 ,  G11B05/596

CPC classification number: G11B19/20 ,  G11B5/54 ,  G11B19/00 ,  G11B19/10 ,  G11B21/106

Abstract: A data transfer apparatus for use with a replaceable dislike record medium such as a flexible magnetic disk having data storage tracks thereon, comprising a disk drive motor for imparting rotation to the record medium, and a head transport motor for transporting a transducer head or heads radially of the record medium so as to enable the transducer head or heads to access the individual data storage tracks on the record medium for data transfer therewith. Also included is a control and drive circuit for controllably energizing the head transport motor. When the record medium is not loaded in the apparatus, the control and drive circuit holds the supply voltage of the head transport motor zero. or lower than its normal operating voltage for head transportation, for saving power. Then, as the record medium is loaded into the apparatus, the control and drive circuit applies the normal operating voltage to the head transport motor preparatory to the commencement of data transfer, thereby automatically recorrecting the head position on the record medium.

公开(公告)号：EP0174095A3

公开(公告)日：1987-11-19

申请号：EP85305523

申请日：1985-08-02

Applicant: SONY CORPORATION

Inventor： Kutaragi, Ken Sony Corporation Patents Division

IPC: G11B05/596

CPC classification number: G11B27/105 ,  G11B5/016 ,  G11B5/5526 ,  G11B5/59611 ,  G11B20/1251 ,  G11B21/085 ,  G11B21/106 ,  G11B27/034 ,  G11B2220/20 ,  G11B2220/2512

Abstract: A tracking control apparatus for recording and/or reproducing signals on or from a rotating magnetic disc (2) having a plurality of concentric recording tracks, includes a transducer (11, 12) provided in contacting relation to the magnetic disc (2), a motor (13) coupled to the transducer (11, 12) for moving the transducer (11, 12) in the radial direction of the magnetic disc (2), a track status memory (51) for storing track identifying signals for each of the recording tracks, a level detecting circuit (54) for detecting levels of reproduced signals from the tracks, and a circuit (51, 65) for controlling the motor (13) for positioning the transducer (11, 12) in tracking relation to each of the tracks when either of the identifying signals indicates that the adjacent tracks on both sides are not digital data tracks, or the track is an analog data track, based on the outputs from the level detecting circuit (54), otherwise the positioning motor (13) is mechanically controlled regardless of outputs from the level detecting circuit (54).

公开(公告)号：EP0191247A3

公开(公告)日：1987-09-02

申请号：EP85309472

申请日：1985-12-24

Applicant: Ing. C. Olivetti & C., S.p.a.

Inventor： Trovato, Antonio ,  Picerno, Giuseppe

IPC: G11B21/02 ,  G11B21/08 ,  G11B05/596 ,  G11B05/55

CPC classification number: G11B5/5521 ,  G11B5/55 ,  G11B5/5547 ,  G11B5/59655

Abstract: The apparatus records and reads binary information on a magnetic disk having magnetisable surfaces subdivided into a plurality of concentric tracks in which the information is recorded in block form (sectors). A first electric motor rotates the magnetic disk at a substantially constant angular velocity, and a second motor (22) of stepping type is operable to position the magnetic recording and reading heads (16, 17) with respect to the recording tracks of the disk. On each track, each block of binary information contains prerecorded burst information which, when read by the corresponding magnetic head, is capable of causing micrometric rotary adjusting movements of the stepping motor to bring the magnetic head into precise alignment with the selected recording track and to hold it in that position. Thus amplitude information from two bursts either side of the centre line of the track is compared (52, 55, 59, 58) to provide a signal (pSTEP) when the amplitude discrepancy exceeds a threshold, and a signal (µDIR) indicating the sense of the discrepancy. A motor control circuit (61) effects micro-steps by applying pulses to the stepping motor (22) with duty cycle modulation.

公开(公告)号：EP0209692A3

公开(公告)日：1987-08-19

申请号：EP86107741

申请日：1986-06-06

Applicant: International Business Machines Corporation

Inventor： Workman, Michael Lee

IPC: G11B05/596 ,  G11B21/10

CPC classification number: G11B21/085

Abstract: n improvement to a disk file servo control system removes repeatable error from the read write head position error signal (PES) during track following. The disk file includes a microprocessor 60 and associated memory devices 62,64. A table of values of a sine function having a frequency equal to the disk rotational frequency is stored in a memory device. The microprocessor 60 receives each sample of PES from the servo control system and values from the sine function table in the memory device and computes a group of tap weights, each tap weight being a function of the PES sample, the value of a sine or cosine function with a frequency at one of the harmonics of the disk rotational frequency, a learning ratefac- tor and the corresponding value of the tap weight for the previous PES sample. For each PES sample, the tap weights in a group are added to generate a repeatable error correction signal U c which is summed with the control signal U to the head actuator, thereby generating a modified control signal U m which causes the head to follow the true track centerline. The repeatable error components are thus removed from the PES.

公开(公告)号：EP0147993A3

公开(公告)日：1987-08-05

申请号：EP84308831

申请日：1984-12-17

Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA

Inventor： Mizuno, Masahiro c/o Computer Works ,  Baba, Hiroshi c/o Computer Works

IPC: G11B05/55 ,  G11B05/596 ,  G11B21/08 ,  G11B21/10

CPC classification number: G11B21/085 ,  G11B5/5565 ,  G11B5/59627 ,  G11B5/59655

Abstract: @ A disk unit includes a control unit (17,18,) for controlling the stop position of a positioning electric motor (11) and positioning a magnetic head (9) on a predetermined data track on a magnetic disk, and positioning error adjustment unit (19) for supplying analog signals to the control unit, wherein the analog signals are related to the positioning error detected by the magnetic head. An exciting current which goes high during a time interval T1 and goes low during a time interval T2 during a period T is caused to flow in a first exciting coil of the motor while an exciting current which goes low during the same time interval T1 and goes high during the same time interval T2 is caused to flow in another exciting coil adjacent to the first coil and the duration of the time intervals T1 and T2 with respect to the period T is adjusted by the control unit, as a function of the magnitude of the aforementioned analog signal. Thus, the two currents have adjustable duty cycles which are the inverse of one another. This permits fine adjustment of the stopping position of the motor.

公开(公告)号：EP0173844A3

公开(公告)日：1987-05-06

申请号：EP85109184

申请日：1985-07-23

Applicant: International Business Machines Corporation

Inventor： Albrecht, David William

IPC: G11B05/596 ,  G11B21/10

CPC classification number: G11B5/59688

Abstract: The drawing shows a pattern of servo signals prerecorded in a magnetic recording disc. The pattern comprises groups (44 to 47) of prerecorded elements A, B arranged along radial lines (40 to 43) of the disc within data tracks (60 to 65). The groups (45,47) on tracks (63 to 65) lie between the groups (44, 46) on tracks (60 to 62). The disc is for use in bringing or maintaining a read/write head assembly having a plurality of read/write head elements (50, 52) aligned with the centre lines of the data tracks (60, 63) with which the head elements (50, 52) are aligned. The head elements (50, 52) read alternatively the servo signals (44. 45, 46, 47) and provide a sequence of signals which are combined to provide a single signal containing information about the positions of the head elements relative to the centre lines of their aligned data tracks. From this signal a correcting signal is generated and is supplied to the actuator used for moving the head assembly radially across the disc surface to correct any mis-alignment.