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公开(公告)号：US3567960A
公开(公告)日：1971-03-02
申请号：US3567960D
申请日：1968-06-04
Applicant: IBM
Inventor： OWEN CHARLES E , WALLIS CHRISTOPHER N
CPC classification number: G11B20/1419 , H03K5/00
Abstract: A gating circuit useful for separating data pulses from clock pulses in a double frequency detection system includes a signal generator that provides a sawtooth waveform having ramp portions of the same slope and a flyback interval of fixed magnitude. When the sawtooth signal is above a variable threshold, an input gate is enabled to allow the clock pulses to initiate flyback. The proportions of the sawtooth waveform above and below the threshold remain constant, so that early or late arrival of a clock pulse does not affect the gating of succeeding clock pulses. Thus, an output gate is made to operate to block clock pulses while passing data pulses.
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公开(公告)号：FR2374719A1
公开(公告)日：1978-07-13
申请号：FR7734668
申请日：1977-11-10
Applicant: IBM
Inventor： WALLIS CHRISTOPHER N
Abstract: An actuator comprising a transformer having a fixed primary winding on a magnetic core and a pivotally movable coil linked with the magnetic core and forming a secondary winding of the transformer. A permanent magnet generates a static magnetic field in which the coil is disposed. A transducer arm capable of pivotal movement is attached to the coil. When a current pulse is applied to the primary winding, a current is induced in the coil which reacts with the static magnetic field to cause pivotal movement of the coil and attached arm.
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公开(公告)号：CA1085901A
公开(公告)日：1980-09-16
申请号：CA290828
申请日：1977-11-14
Applicant: IBM
Inventor： WALLIS CHRISTOPHER N
Abstract: An electromagnetic induction actuator for the transducer arm of a magnetic disc file is described which provides faster operation without increase in input power as compared to present voice coil actuators. The actuator consists of a transformer having a fixed primary winding on a magnetic core. An angularly movable coil is linked with the magnetic core forming a secondary winding of the transformer. A permanent magnet generates a static magnetic field which is coupled to the coil. One or more transducer arms capable of angular movement are attached to the coil. When a current pulse is applied to the primary winding, a current is induced in the coil which reacts with the static magnetic field to cause angular movement of the coil and attached arm.
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Patent Agency Ranking
公开(公告)号：FR2315141A2
公开(公告)日：1977-01-14
申请号：FR7613469
申请日：1976-04-29
Applicant: IBM
Inventor： RIGBEY LEONARD J , WALLIS CHRISTOPHER N
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公开(公告)号：CA815190A
公开(公告)日：1969-06-10
申请号：CA815190D
Applicant: IBM
Inventor： VALSTYN ERICH P , WALLIS CHRISTOPHER N
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公开(公告)号：RO72000A2
公开(公告)日：1984-04-12
申请号：RO8643376
申请日：1976-08-11
Applicant: IBM
Inventor： RIGBEY LEONARD , WALLIS CHRISTOPHER N
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公开(公告)号：CA1078513A
公开(公告)日：1980-05-27
申请号：CA255203
申请日：1976-06-18
Applicant: IBM
Inventor： RIGBEY LEONARD J , WALLIS CHRISTOPHER N
Abstract: ACTUATOR MECHANISM FOR DISK STORAGE APPARATUS The invention relates to an actuator mechanism suitable for positioning a recording head over the surface of a recording disk. The actuator consists of a planar coil etched from a copper laminated board. The board is pivoted at one end and carries a recording head supported on an extended arm. Magnets produce a flux perpendicular to the plane of the laminate so that current through the coil produces limited motion of the board about its pivot. The actuator mechanism is located in relation to the disk so that the limited motion of the board moves the head over the disk from one transducing position to another. The mechanism is included in a closed loop servo system which derives position information from servo tracks on the disk and enables track access and track following operations to be conducted.
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公开(公告)号：CA886177A
公开(公告)日：1971-11-16
申请号：CA886177D
Applicant: IBM
Inventor： OWEN CHARLES E , WALLIS CHRISTOPHER N
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