公开(公告)号：EP0222054A3

公开(公告)日：1988-05-04

申请号：EP86105788

申请日：1986-04-26

Applicant: TALLGRASS TECHNOLOGIES, INC.

Inventor： Brent, George I.

IPC: G11B05/55

CPC classification number: G11B5/5508

Abstract: A mechanism (10) for moving a magnetic read/write recording head (12) across a tape (14) storage medium. A linear actuator (22) drives an output shaft which carries a cable connector (44). A flexible cable (46) is connected with the cable connector (44) at one end and at the other end with an elevator bracket (58) which carries the recording head (12). The cable (46) is bent through a 90° bend between its ends along an arcuate guide surface (54). The elevator bracket (58) moves up and down across the tape (14) on guide pins (66). A spring (78) maintains the cable (46) under tension to translate horizontal extension and retraction of the actuator shaft (38) into corresponding vertical movement of the tape head. The use of a cable (46) reduces the application of moments to the head (12) and avoids applying rotational forces.

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：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：EP0113051A3

公开(公告)日：1986-09-03

申请号：EP83111932

申请日：1983-11-29

Applicant: International Business Machines Corporation

Inventor： Cocke, John ,  DiStefano, Thomas Herman

IPC: G11B05/58 ,  G11B05/55 ,  G11B21/10

CPC classification number: G11B5/59677

Abstract: An information reading/writing head (H) is positioned to follow data tracks (TR) that are formed concentrically on a magnetic recording disk (D). A set of spiral radial position-indicating markings (Pl, P2,..) is formed which can be detected on the disk optically, or capacitively. The position of the head is determined by sensing the spiral markings. The reference for the phase detection is detected by sensing radial indicia (Rl, R2,..) on the disk periphery or spiral markings of servo data with a different pitch and frequency from the position-indicating spiral markings. A servo control system operated by the above disk, reads the radial position-indicating spiral pattern and the reference pattern on the disk and compares the relative phases of the two to compute the track position of the head. A set of phase-locked loops with subsequent phase comparators is used to decode the servo data.

公开(公告)号：EP0104941A3

公开(公告)日：1985-11-06

申请号：EP83305785

申请日：1983-09-27

Applicant: QUANTUM CORPORATION

Inventor： Harrison, Joel N. ,  Condito, Vincent A. ,  Graham, Randolph H. ,  Nixon, Brian J. ,  Simonsen, Richard C.

IPC: G11B21/08 ,  G11B21/10 ,  G11B19/28 ,  G11B05/58 ,  G11B05/55

CPC classification number: G11B19/28 ,  G11B5/5521 ,  G11B5/59677 ,  G11B21/085

Abstract: A data storage device (20) comprises a unitary base casting (21); a plurality of data storage disks (26a, 26b, 26c and 26d), at least one disk having a servo sector prerecorded with two series of alternating servo bursts; a brushless direct current drive motor (24) mounted to the base for rotating the disks; data transducers (63a, 63b, 63c, 63d, 63e, 63f, 63g, and 63h) mounted on a rotary carriage (28); a thermally isolated rotary actuator (40) for moving the carriage means and thereby the transducers; an optical encoder (70) having a housing incorporating a light source (82) and a photodiode array (93) and a scale (100) movable between the source and the array in response to movement of the carriage (28); a peak detector for detecting peak amplitudes of the servo bursts; and programmed digital computer means including an analogue to digital converter for converting the outputs of the photodiode array and peak detector to digital values; processor means for controlling movement of the actuator, via a digital to analogue converter, by counting data track boundaries from the digitised photodiode array signals and track centreline offset values from the digitised servo burst signals to move the transducers between data tracks in accordance with instructions from a user interface and to maintain the transducers in track centreline alignment in accordance with the calculated offset values.

公开(公告)号：EP0108207A3

公开(公告)日：1985-05-22

申请号：EP83108277

申请日：1983-08-23

Applicant: International Business Machines Corporation

Inventor： Quist, Frederick Fenn, Jr. ,  Steinbrecher, Marc Lawrence

IPC: G11B05/55 ,  G11B05/56 ,  G11B05/012

CPC classification number: G11B5/5521

Abstract: A flexible disk drive in which the head (10) moves in an arc (24), as the head is selectively moved to access the data at the various concentric data tracks (23) of a disk. Concomitant with this approximate arcuate movement, the head is azimuth-rotated, such that its gap has a predefined, optimum azimuth orientation to each of the individual disk tracks, for example, the head's gap is normal to the track's center line at each head position.

公开(公告)号：EP0049946A3

公开(公告)日：1982-12-08

申请号：EP81304124

申请日：1981-09-09

Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY

Inventor： Ostroff, Arthur

IPC: G11B17/06 ,  G11B03/08 ,  G11B05/55 ,  G05D03/14

CPC classification number: G11B21/081 ,  G11B3/0952

Abstract: An initialization apparatus for a signal reproducing apparatus having a transducer (18) scanning a plurality of record tracks (16) on a record medium (12) where the position of the transducer (18) is controlled by a stepper motor (22) having fewer steps than the number of record tracks (16) required to be covered. A physical stop (28 or 30) is provided the transducer (18) near a selected "home" record track at one edge of the plurality of record tracks (16). A current selector supplies the phase windings of the stepper motor (22) with a reduced amplitude current during an initialization position. This enables a transducer controller to step the stepper through a sequence of steps under reduced current to the phase windings of the stepper motor (22) until the physical stop (28 or 30) is contacted, thus ensuring knowledge of the initialization of the transducer (18) at the "home" record track.

公开(公告)号：EP0049948A3

公开(公告)日：1982-12-01

申请号：EP81304127

申请日：1981-09-09

Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY

Inventor： Lewis, Martyn A.

IPC: G11B21/02 ,  G11B05/55 ,  H02P08/00 ,  G05B19/40

CPC classification number: G11B21/081

Abstract: A control system for a stepper motor utilized in positioning a transducer (18) in relationship to a plurality of parallel tracks (14, 16) on a record media (10). Dual closed loop feedback systems are provided. A current control circuit is provided having a high output impedance and a voltage control circuit is provided having a low output impedance. A switch (30) may select the current control sensor (28) when the transducer (18) is making coarse adjustments in position and may select the voltage control sensor (32) when the transducer (18) is making fine adjustments in position. A seamless switchover may be achieved where the voltage control sensor (32) has a time constant which matches the time constant of the stepper motor. Performance is further improved by providing an impedance cancellation circuit (252, 254, 256, 258, 260, 262) which eliminates the internal resistance of the motor in order to quickly damp motionally induced emf of the motor.

公开(公告)号：EP0000946A3

公开(公告)日：1979-03-21

申请号：EP78100748

申请日：1978-08-25

Applicant: Hewlett-Packard Company

Inventor： McKnight, Robert N.

IPC: G11B05/58 ,  G11B05/55 ,  G05D03/00

CPC classification number: G11B5/5547 ,  G11B5/59633

Abstract: Two servoing functions, both operating from the data reading and recording transducer, are performed in a high performance movinghead disc drive. One servo rapidly moves the head from its current track to any other track utilizing absolute track identifying addresses recorded in the inter-sector gap between data sectors. Once located on a track, the other servo maintains head location precisely over the center of that track while data is being read or recorded employing track following information also recorded in the inter-sector gap. The resolution of transducer location is enhanced by secondary use of the track following information.

Abstract translation: 在数据读取和记录传感器中操作的两个伺服功能在高性能移动头磁盘驱动器中执行。 一个伺服系统使用绝对轨迹快速地将磁头从当前轨道移动到任何其他轨道，该绝对轨迹识别记录在数据扇区之间扇区间间隙中的地址。 一旦位于轨道上，另一个伺服机构就可以精确地将磁头位置保持在该磁道的中心，同时使用跟踪信息也被记录在扇区间间隙中，同时读取或记录数据。 传感器位置的分辨率通过二次使用轨道跟踪信息来增强。

公开(公告)号：WO1998029870A1

公开(公告)日：1998-07-09

申请号：PCT/GB1997003520

申请日：1997-12-22

Applicant: RENISHAW PLC ,  CHANEY, Raymond, John

Inventor： RENISHAW PLC

IPC: G11B05/55

CPC classification number: G11B21/106 ,  G11B5/4886 ,  G11B5/5534 ,  G11B5/59644 ,  G11B19/14 ,  G11B21/083

Abstract: A disk drive system for a PC includes a rotatable magnetic storage disk (10) and a read/write arm (12) having a reading/writing head (14). During manufacture, servo control tracks are written onto the surface of the disk (10) by means of an external servo writing system including a control arm (40) independently pivotable by means of a motor/encoder unit (50). The control arm has a null sensor (80) which detects the relative displacement of the read/write arm (12) and control arm (40). The control arm (40) has a relatively high inertial mass, whereas the read/write arm has a low inertial mass. Servo control tracks are written by moving the control arm (40) continuously across the surface of the disk. Servo control card (70) receives output signals from the encoder (50) and null sensor (80), and instructs the hard disk control electronics (30) to move the read/write arm (12) into register with the control arm (40) at the instant the control arm (40) lies in register with a region of the disk on which it is desired to write a servo control track (because the read/write arm (12) has a low inertial mass it is moved much more rapidly than the control arm (40)). The read/write arm (12) is then maintained in its position relative to the disk (the servo control card using the output of the null sensor for this purpose), and a servo control track is written. The control arm (40) continues to traverse the disk during writing of the track, and when the track has been written the read/write arm (12) is once again moved rapidly into register with the control arm (40) at the location at which the next servo control track is to be written.

Abstract translation: 用于PC的磁盘驱动器系统包括可旋转磁存储盘（10）和具有读/写头（14）的读/写臂（12）。 在制造过程中，通过外部伺服写入系统将伺服控制轨迹写入到盘（10）的表面上，所述外部伺服写入系统包括可通过马达/编码器单元（50）独立转动的控制臂（40）。 控制臂具有检测读/写臂（12）和控制臂（40）的相对位移的零传感器（80）。 控制臂（40）具有相对高的惯性质量，而读/写臂具有低惯性质量。 通过使控制臂（40）连续移动穿过盘的表面来写入伺服控制轨迹。 伺服控制卡（70）从编码器（50）和空传感器（80）接收输出信号，并指示硬盘控制电子装置（30）将读/写臂（12）移动到控制臂（40） ）在控制臂（40）与要在其上写入伺服控制轨道的盘的区域对准的时刻（因为读/写臂（12）具有低惯性质量，其移动得更多 快速地比控制臂（40））。 然后，读写臂（12）相对于盘保持在其位置（伺服控制卡使用零传感器的输出用于此目的），并且写入伺服控制轨迹。 在写入轨道期间，控制臂（40）继续穿过盘，并且当轨迹已被写入时，读/写臂（12）再次快速地移动到与控制臂（40）对准的位置处 下一个伺服控制轨道将被写入。