US4954909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data memorizing device which determines the movement of the recording head
Assignee: Mitsubishi Electric Corp
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Filing: 1990-01-03
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Granted: 1990-09-04
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Expires: 2010-01-03
Abstract
Abstract A magnetic head is moved in the radial direction of a magnetic recording medium carrier by means of an actuator to record or reproduce data stored therein. The actuator is actuated by an instruction signal from a servo circuit through a computer. The servo circuit receives a position signal and a speed signal according to the movement and stopping of the actuator and generates digital signals having high and low level logical values as a result of a comparison of the position and speed signals with position-determining and speed-determining instruction signals from the computer. A calculator receives the digital signals and a clock signal from a clock signal generator and outputs a pulse signal to the computer when the digital signal takes the high level logical value and resets the counting operation when the digital signal takes the low level logical value.
Inventors
- 👤 Masaharu Sengoku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:55
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/012; G11B19/00; G11B19/02; G11B19/04; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B21/083; G11B5/48; G11B5/488; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5547; G11B5/58; G11B5/60; G11B5/6005; G11B5/6011
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
207 words
A data memorizing device comprising a rotatable disk-like recording medium carrier, a magnetic head placed near a recording surface of said recording medium carrier and an actuator which supports said magnetic head and is driven by an instruction signal given by an outer device to move said magnetic head so as to traverse said recording surface so that said magnetic head is brought to a predetermined position on said recording surface, characterized in that said data memorizing device comprises a digital signal generating means for generating a digital signal consisting of two logical values of a high level value and a low level value which respectively correspond to a set amount of movement and the stop of said actuator; a signal detecting means for detecting said digital signal; a clock signal generating means for generating a clock signal having pulses of a predetermined frequency; and a calculating means which receives said clock signal and digital signal and which outputs a pulse signal having a predetermined value by counting the pulses of said clock when said digital signal takes the high level logical value and when said counted pulses equal a predetermined number, and resets the counting operation when said digital signal takes the low level logical value.
Claim 2
Dependent Claim
207 words
A data memorizing device comprising a rotatable disk-like recording medium carrier, a magnetic head placed near a recording surface of said recording medium carrier and an actuator which supports said magnetic head and is driven by an instruction signal given by an outer device to move said magnetic head so as to traverse said recording surface so that said magnetic head is brought to a predetermined position on said recording surface, characterized in that said data memorizing device comprises a digital signal generating means for generating a digital signal consisting of two logical values of a high level value and a low level value which respectively correspond to a set amount of movement and the stop of said actuator; a signal detecting means for detecting said digital signal; a clock signal generating means for generating a clock signal having pulses of a predetermined frequency; and a calculating means which receives said clock signal and digital signal and which outputs a pulse signal having a predetermined value by counting the pulses of said clock when said digital signal takes the high level logical value and when said counted pulses equal a predetermined number, and resets the counting operation when said digital signal takes the low level logical value.
Claim 3
Dependent Claim
33 words
The data memorizing device according to claim 1, wherein time for positioning said magnetic head is related to the number of pulses of the clock signal generated from said clock signal generating means.
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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |