Patent EP0063936A1 successfully refreshed from Google Patents.
EP0063936A1
Expired / Lapsed
EP
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Position control apparatus
Assignee: Iomega Corp
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Filing: 1982-04-23
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Granted: —
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Expires: 2002-04-23
Abstract
Abstract An improved method and apparatus for servo control of the position of read/write head (18) with respectto a magnetic disk (10) is disclosed. The disk comprises permanently recorded position data information (12). Upon initiation of a head traverse or "seek" operation, a microprocessor is controlled to select predetermined portions of instruction sequences, all of which sequences are used in the event the seek is such that the head (18) reaches its maximum velocity. Otherwise, portions of the accelerate and decelerate command sequences are chosen together with constant velocity commands as necessary to ensure that the head (18) is decelerated smoothly to a stop at the appropriate position.
Inventors
- 👤 Steven H. Powell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:38
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B21/085; G11B21/10; G11B21/106; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5547; G11B5/58; G11B5/596; G11B5/59605; G11B5/59622
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A method of controlling the motion of a read/ write head juxtaposed to a magnetic recording disk having permanently recorded position information data recorded at spaced locations thereon, in traversing operations, comprising generating a series of commands for comparison with actual position signals output by servo mechanism means controlling the position of the head, the said commands being generated by selecting portions of stored command sequences, together with calculated numbers of additional commands and the said selection and calculation being performed upon initiation of each traverse operation.
Claim 2
Independent Claim
87 words
A method of controlling the motion of a read/ write head juxtaposed to a magnetic recording disk having permanently recorded position information data recorded at spaced locations thereon, in traversing operations, comprising generating a series of commands for comparison with actual position signals output by servo mechanism means controlling the position of the head, the said commands being generated by selecting portions of stored command sequences, together with calculated numbers of additional commands and the said selection and calculation being performed upon initiation of each traverse operation.
Claim 3
Dependent Claim
41 words
A method according to claim 1, characterised in that the accuracy of performance of said traversing operation is measured by coincidence of said read/write head to the said permanently recorded position information encoded on the disk at intervals throughout said operation.
Claim 4
Dependent Claim
59 words
A method according to claim 2, characterised in that correction circuitry used to detect whether the head is centered with respect to a particular disk track is used for determination of the correctness of the said trajectory, and predicted deviations of the trajectory from the centres of the tracks are calculated and supplied to the correction circuitry for compensation.
Claim 5
Independent Claim
115 words
An apparatus for storage of digital data on magnetic disk means, comprising a read/write head adapted to be moved under the control of servo motor means relative to said disk means, said head being adapted to detect position information written to said disk for control of said servo motor, said servo motor being controlled by means for comparing said detected position with a commanded position; characterised by further including means for controlling the motion of said head in traversing between differing data tracks on said disk by selecting portions of predetermined sequences of commands for said comparison and adding constant velocity commands to said selected portions, to generate a complete sequence of commands for comparison.
Claim 6
Independent Claim
115 words
An apparatus for storage of digital data on magnetic disk means, comprising a read/write head adapted to be moved under the control of servo motor means relative to said disk means, said head being adapted to detect position information written to said disk for control of said servo motor, said servo motor being controlled by means for comparing said detected position with a commanded position; characterised by further including means for controlling the motion of said head in traversing between differing data tracks on said disk by selecting portions of predetermined sequences of commands for said comparison and adding constant velocity commands to said selected portions, to generate a complete sequence of commands for comparison.
Claim 7
Dependent Claim
67 words
An apparatus according to claim 4, characterised in that the means for generating the said sequences of commands comprises microprocessor means for determining what portions of predetermined sequences of accelerate and decelerate commands are required for a given traverse operation and for calculating appropriate locations for constant velocity commands in a sequence of commands whereby an entire sequence of commands is generated uniquely for each traverse operation.
Claim 8
Dependent Claim
79 words
Position control apparatus for controlling the position of a movable member in response to a command thereto indicating the amount of movement required, comprising means storing data representing predetermined acceleration and deceleration sequences of the member and means responsive, in operation, to the said command to select portions of the stored data and calculate, where necessary, additional sequence steps and means responsive to the selected data and any calculated additional sequence information to control the position of the member.
Claim 9
Dependent Claim
79 words
Position control apparatus for controlling the position of a movable member in response to a command thereto indicating the amount of movement required, comprising means storing data representing predetermined acceleration and deceleration sequences of the member and means responsive, in operation, to the said command to select portions of the stored data and calculate, where necessary, additional sequence steps and means responsive to the selected data and any calculated additional sequence information to control the position of the member.
Claim 10
Dependent Claim
66 words
An apparatus according to claim 6, characterised in that the selection and calculation means is arranged in operation to select, for movements less than a predetermined amplitude, data representing a complete acceleration and deceleration sequence, and the control means is arranged in operation, at least for movements greater than the said amplitude, to commence movement of the movable member before the selection and calculation is complete.
References Cited (Backward Citations)
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