US4887173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage apparatus including head drive control
Assignee: Mitsubishi Electric Corp
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Filing: 1988-10-25
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Granted: 1989-12-12
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Expires: 2008-10-25
Abstract
Abstract In a magnetic disk storage apparatus, a magnetic disk, magnetic head, head positioning mechanism and head servo circuit are employed. To avoid an oscillation phenomenon of a head servo system, there is provided a gain controlling system so as to adjust an amplification gain of the servo circuit.
Inventors
- 👤 Masaharu Sengoku
- 👤 Kimiyo Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:30
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B21/085; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59605; G11B5/59622
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
A storage apparatus comprising: a recording medium rotatably driven for storing data; head means for writing/reading said data on/from a recording area of said recording medium while being positioned opposite to a predetermined recording area of said recording medium; actuator means for positioning said head means to said predetermined recording area of the recording medium; a sensor for sensing a present position of said head means with respect to said recording area of the recording medium to produce a sensor signal; a servo circuit for controlling a positioning operation of said actuator means based upon said sensor signal; a reference signal generator for generating a reference signal; a comparator for comparing said sensor signal with said reference signal to produce a comparator signal; a gain controller for processing said comparator signal to produce a gain control signal; and, a variable gain amplifier interposed between said servo circuit and actuator means, for varying an amplification gain of said servo circuit in response to said gain control signal so as to suppress an oscillation phenomenon of a servo system constructed of said servo circuit, actuator means, and sensor.
Claim 2
Dependent Claim
186 words
A storage apparatus comprising: a recording medium rotatably driven for storing data; head means for writing/reading said data on/from a recording area of said recording medium while being positioned opposite to a predetermined recording area of said recording medium; actuator means for positioning said head means to said predetermined recording area of the recording medium; a sensor for sensing a present position of said head means with respect to said recording area of the recording medium to produce a sensor signal; a servo circuit for controlling a positioning operation of said actuator means based upon said sensor signal; a reference signal generator for generating a reference signal; a comparator for comparing said sensor signal with said reference signal to produce a comparator signal; a gain controller for processing said comparator signal to produce a gain control signal; and, a variable gain amplifier interposed between said servo circuit and actuator means, for varying an amplification gain of said servo circuit in response to said gain control signal so as to suppress an oscillation phenomenon of a servo system constructed of said servo circuit, actuator means, and sensor.
Claim 3
Dependent Claim
60 words
A storage apparatus as claimed in claim 1; further comprising a head speed demodulator for demodulate said sensor signal derived from said sensor to supply velocity information of said head means to said servo circuit, whereby said servo circuit controls said positioning operation of said actuator means based upon both said present position and velocity information of said head means.
Claim 4
Dependent Claim
30 words
A storage apparatus as claimed in claim 1, further comprising a read/write circuit for reading/writing said data on/from said predetermined recording area of the recording medium via said head means.
Claim 5
Dependent Claim
24 words
A storage apparatus as claimed in claim 1, wherein said recording medium is a magnetic disk, and said head means is a magnetic head.
Claim 6
Dependent Claim
30 words
A storage apparatus as claimed in claim 1, wherein said reference signal generator is a battery, and said variable gain amplifier is an operational amplifier having a variable feedback resistor.
Claim 7
Dependent Claim
54 words
A storage apparatus as claimed in claim 1, wherein said gain controller includes; a gain margin calculator for calculating a gain margin in response to said comparator signal from said comparator; and a gain control signal generator for generating said gain control signal by processing said gain margin under the control of a microprocessor.
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) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |