US4524398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Velocity control device for magnetic disc apparatus and method therefor
Assignee: Toshiba Corp
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Filing: 1983-05-12
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Granted: 1985-06-18
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Expires: 2003-05-12
Abstract
Abstract A velocity control system for a magnetic disc apparatus has: a circuit for generating a two-phase position signal which is used to determine the position of the magnetic head; an A/D converter for converting the two-phase position signal to a digital signal; a microprocessor for computing a target velocity and a real velocity which correspond to a distance between the target track and the current position of the magnetic head in accordance with the digital signal, and for computing a velocity difference between the target velocity and the real velocity; a D/A converter for converting a signal corresponding to the velocity difference to an analog signal; and a linear motor for driving the magnetic head to control the seek velocity of the magnetic head, in accordance with the analog signal.
Inventors
- 👤 Masao Fujiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5547
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A velocity control device for a magnetic disc apparatus for reading out from or writing data on a recording track of a magnetic disc having servo sectors and data sectors, using a magnetic head, comprising: (a) position signal generating means for generating a two-phase signal which determines a target position of said magnetic head; (b) analog-to-digital signal converting means for converting the two-phase signal to a digital signal; (c) computing means for computing a target velocity and a real velocity of said magnetic head from the digital signal and for computing a difference between the target velocity and the real velocity; (d) digital-to-analog signal converting means for converting the difference obtained by said computing means to an analog signal; and (e) driving means for driving said magnetic head in accordance with the analog signal.
Claim 2
Dependent Claim
134 words
A velocity control device for a magnetic disc apparatus for reading out from or writing data on a recording track of a magnetic disc having servo sectors and data sectors, using a magnetic head, comprising: (a) position signal generating means for generating a two-phase signal which determines a target position of said magnetic head; (b) analog-to-digital signal converting means for converting the two-phase signal to a digital signal; (c) computing means for computing a target velocity and a real velocity of said magnetic head from the digital signal and for computing a difference between the target velocity and the real velocity; (d) digital-to-analog signal converting means for converting the difference obtained by said computing means to an analog signal; and (e) driving means for driving said magnetic head in accordance with the analog signal.
Claim 3
Dependent Claim
182 words
A velocity control method for a magnetic disc apparatus for reading out from or writing data on a recording track of a magnetic disc having servo sectors and data sectors, using a magnetic head, comprising the steps of: (a) generating a two-phase signal which determines a target position of said magnetic head; (b) converting the two-phase signal to a digital signal; (c) computing a travel distance of said magnetic head in accordance with said two-phase position signal and a current track position of said magnetic head; (d) updating the current track position in accordance with the travel distance and computing a difference between an updated current track position and a target track; (e) determining a target speed corresponding to the difference between the updated current track position and the target track; (f) computing a real speed of said magnetic head; (g) computing a velocity difference between the target velocity and the real velocity; (h) converting the velocity difference between the target velocity and the real velocity to an analog signal; and (i) driving said magnetic head in accordance with the analog signal.
Claim 4
Dependent Claim
182 words
A velocity control method for a magnetic disc apparatus for reading out from or writing data on a recording track of a magnetic disc having servo sectors and data sectors, using a magnetic head, comprising the steps of: (a) generating a two-phase signal which determines a target position of said magnetic head; (b) converting the two-phase signal to a digital signal; (c) computing a travel distance of said magnetic head in accordance with said two-phase position signal and a current track position of said magnetic head; (d) updating the current track position in accordance with the travel distance and computing a difference between an updated current track position and a target track; (e) determining a target speed corresponding to the difference between the updated current track position and the target track; (f) computing a real speed of said magnetic head; (g) computing a velocity difference between the target velocity and the real velocity; (h) converting the velocity difference between the target velocity and the real velocity to an analog signal; and (i) driving said magnetic head in accordance with the analog signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |