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公开(公告)号：CA1066410A
公开(公告)日：1979-11-13
申请号：CA268486
申请日：1976-12-22
Applicant: IBM
Inventor： LOUIS HELMUT , MATLA ARNO , SCHALLER KARL H , ZIMMERMANN VOLKER
Abstract: POSITIONING DEVICE FOR THE ACCESS ARM OF THE MAGNETIC HEAD OF A MAGNETIC DISK STORAGE The surface of a magnetic disk (23) is divided into servo sectors (S1) and data sectors (S2). A selectively positionable magnetic head (24) effects, in predetermined time intervals controlled by clock signals of a clock sensor (26), the transfer of servo and data signals. The servo signals sensed in the servo sectors are used for the track following control of the magnetic head. The servo markings (Ma) recorded in the servo sectors (S1) are arranged, with twice the width (2d) of the data tracks in radial distances of one respective track width (d), one beside the other in a row along a disk radius. In each servo sector at least three rows (A, B, C) of servo markings (Ma) are provided. The servo markings are arranged in track direction one behind the other in such a manner that between each of the rows (A, B, C) a distance (g) is formed, and that each servo marking of one row overlaps a servo marking of the following row by one track width (d).
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公开(公告)号：DE2421219A1
公开(公告)日：1975-11-06
申请号：DE2421219
申请日：1974-05-02
Applicant: IBM DEUTSCHLAND
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公开(公告)号：DE3160989D1
公开(公告)日：1983-11-03
申请号：DE3160989
申请日：1981-02-16
Applicant: IBM
Inventor： MATLA ARNO , ZIMMERMANN VOLKER
Abstract: For the servo track control of magnetic heads over magnetic tracks, in addition to the main servo position signals arranged in offset fashion to the middle of the track, auxiliary servo position signals are provided symmetrically on each side of the middle of the track. These auxiliary servo position signals are offset along the track length relative to each other and are smaller than half the track width. In the determination of the position error signal, they serve to indicate the tilting of the magnetic head relative to the recording track in that they are unequal. If the magnetic head deviates greatly from the middle of the track, these auxiliary servo position signals can be added to the main servo position signals to obtain a stronger position error signal. For determining and compensating uniform disturbance variables, the momentary values of a control signal are measured and a mean value is formed thereof which, at predetermined intervals, is added to a preceding mean value, stored, and entered as an additional control signal to the control path.
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公开(公告)号：DE2433809A1
公开(公告)日：1976-01-29
申请号：DE2433809
申请日：1974-07-13
Applicant: IBM DEUTSCHLAND
Inventor： LUTZ HEINZ , ZIMMERMANN VOLKER , ZUEHLKE RAINER DR
Abstract: 1471272 Electric motors INTERNATIONAL BUSINESS MACHINES CORP 17 June 1975 [13 July 1974] 25692/75 Heading H2A An electric stepping motor comprises a rotor 1 having a conical portion co-operating with complementary stator pole faces, the cone angle being at least 15 degrees. The toothed conical rotor of the inductor type stepping motor shown is magnetized by a coil 7 and interacts with the toothed faces of four stator poles 3. The rotor may be hollow, Fig. 8 (not shown). In a modification, Fig. 9 (not shown), having a permanent magnet rotor comprising two conical portions placed base-to-base, the two conical surfaces are of opposite polarity and interact with respective groups of stator poles. Either the rotor teeth or the stator teeth of the two halves of the motor may be angularly staggered. An inductor type motor may also be designed to have two conical rotor portions.
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公开(公告)号：DE3472323D1
公开(公告)日：1988-07-28
申请号：DE3472323
申请日：1984-10-16
Applicant: IBM
Inventor： GRAVES DAVID CONRAD , SCHNEIDER RICHARD CRANE , ZIMMERMANN VOLKER
Abstract: @ An adaptive equalization circuit for magnetic recording channels which derives an error signal to change the equalizer compensation value from the timing of random signal data and provides continuous feedback compensation.In the Figure data from read head (21a) is amplified by amplifier (22a) and partially equalized in fixed equalizer (23a). The signal is applied to summation circuit (49) which receives a variable correction input signal. The summed signal is applied to data pulser circuit (24a) which provides output pulses to detector circuit (26a) and variable frequency clock (25a) at times of positive or negative peaks in the . received signal. The correction signal is derived from an equalization filter circuit (48) controlled by the output of a variable gain amplifier (47), the gain of which is set by the voltage on line (65). This voltage is determined by circuitry (69) from the three input supplied thereto.
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Patent Agency Ranking
公开(公告)号：DE2861774D1
公开(公告)日：1982-06-09
申请号：DE2861774
申请日：1978-12-07
Applicant: IBM
Inventor： MATLA ARNO , MATTHAEI HORST , ZIMMERMANN VOLKER
Abstract: In a signal storage apparatus employing a rotating record disk, the resonant frequency of a head carriage assembly is tuned to the rotational speed of the record disk. The head carriage assembly, in following a record track on the record disk, has to accommodate record disk rotational perturbations; i.e., run out, eccentric mounting, etc. Such variations are better accommodated in the head carriage assembly by electrically tuning the head carriage assembly to the rotation of the record disk. In a voice coil head assembly actuator, a pair of opposing coils carry equal current amplitudes. These equal current amplitudes are adjusted to rotational speed of the record disk to thereby continuously tune the head carriage assembly to the record disk rotation.
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公开(公告)号：FR2413746A1
公开(公告)日：1979-07-27
申请号：FR7834438
申请日：1978-11-30
Applicant: IBM
Inventor： MATLA ARNO , ZIMMERMANN VOLKER
Abstract: During the access mode of a movable magnetic head in a disk file, a program of position control signals is derived from a simulator, the input of which is clocked at sector time intervals. The position control signals of the simulator are periodically transferred to the summing point of a servo loop which successively is error conditioned, dependent on the subsequent nominal magnetic head positions derived from the simulator. Servo sectors on the data disk are sampled by the magnetic head, evaluated and converted to a digitally coded position error signal. The error signal is summed with a digital position control signal, and the output sum signal in analog form is applied to the motor that drives the head. The track following function is accomplished by means of a closed servo loop, which is also used in the access mode.
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公开(公告)号：DE2759066A1
公开(公告)日：1979-07-12
申请号：DE2759066
申请日：1977-12-30
Applicant: IBM DEUTSCHLAND
Inventor： MATLA ARNO DIPL PHYS , ZIMMERMANN VOLKER
Abstract: During the access mode of a movable magnetic head in a disk file, a program of position control signals is derived from a simulator, the input of which is clocked at sector time intervals. The position control signals of the simulator are periodically transferred to the summing point of a servo loop which successively is error conditioned, dependent on the subsequent nominal magnetic head positions derived from the simulator. Servo sectors on the data disk are sampled by the magnetic head, evaluated and converted to a digitally coded position error signal. The error signal is summed with a digital position control signal, and the output sum signal in analog form is applied to the motor that drives the head. The track following function is accomplished by means of a closed servo loop, which is also used in the access mode.
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公开(公告)号：AU2437777A
公开(公告)日：1978-10-26
申请号：AU2437777
申请日：1977-04-18
Applicant: IBM
Inventor： LOUIS HELMUT , MATLA ARNO , SCHALLER KARL HEINZ , ZIMMERMANN VOLKER
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公开(公告)号：CA1016598A
公开(公告)日：1977-08-30
申请号：CA223595
申请日：1975-03-27
Applicant: IBM
Inventor： BECHTLE BASTIAN , SCHUNEMANN CLAUS , SKUDELNY GISBERT , SPRUTH WILHELM , WEIS HELMUT , ZIMMERMANN VOLKER
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