Patent US4736263A successfully refreshed from Google Patents.
US4736263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for driving a disk
Assignee: Hitachi Ltd
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Filing: 1985-08-19
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Granted: 1988-04-05
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Expires: 2005-08-19
Abstract
Abstract In a disk unit having a rotating mechanism to rotate the disk by pinching the disk at both sides, and a loading mechanism to bring a read-write head into contact with the disk, a method for driving the disk includes the steps in which, at the time of recording and reproduction, the rotating mechanism and the loading mechanism are actuated simultaneously, and when the recording and reproduction are completed, the rotating mechanism is stopped simultaneously with release of the loading mechanism, or after the lapse of a predetermined time from the release.
Inventors
- 👤 Mikio Takahashi
- 👤 Yasuo Yamamoto
- 👤 Yoshihiro Moribe
- 👤 Akira Chuma
- 👤 Kazuo Nakagoshi
- 👤 Nobukuni Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:23
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/12; G11B17/00; G11B17/02; G11B17/04; G11B17/0401; G11B17/0402; G11B19/00; G11B19/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
237 words
A disk drive to be connected to and controlled by a controller, comprising: clamping means for clamping a recording medium; a motor for rotating said recording medium clamped by said clamping means; a motor driving circuit for driving said motor to rotate at predetermined rotational speeds; loading means for bringing a read-write head into contact with said recording medium; and a control circuit for controlling said motor driving circuit and said loading means, said control circuit being arranged such that when said disk drive is selected by said controller to carry out a read-write operation, said control circuit controls said motor driving circuit to rotate said motor at a first rotational speed, and controls said loading means such that said read-write head approaches and makes contact with said recording medium; said control circuit being further arranged such that when said read-write operation is finished, said control circuit controls said loading means such that said read-write head retracts from said recording medium, and controls said motor driving circuit to rotate said motor at a second rotational speed which is less than said first rotational speed and greater than zero, either simultaneously with the start of the retraction of said head from said recording medium or at a predetermined time after the start of the retraction of said head, said second rotational speed being maintained until said rotating means and loading means are again actuated for another read-write operation.
Claim 2
Dependent Claim
237 words
A disk drive to be connected to and controlled by a controller, comprising: clamping means for clamping a recording medium; a motor for rotating said recording medium clamped by said clamping means; a motor driving circuit for driving said motor to rotate at predetermined rotational speeds; loading means for bringing a read-write head into contact with said recording medium; and a control circuit for controlling said motor driving circuit and said loading means, said control circuit being arranged such that when said disk drive is selected by said controller to carry out a read-write operation, said control circuit controls said motor driving circuit to rotate said motor at a first rotational speed, and controls said loading means such that said read-write head approaches and makes contact with said recording medium; said control circuit being further arranged such that when said read-write operation is finished, said control circuit controls said loading means such that said read-write head retracts from said recording medium, and controls said motor driving circuit to rotate said motor at a second rotational speed which is less than said first rotational speed and greater than zero, either simultaneously with the start of the retraction of said head from said recording medium or at a predetermined time after the start of the retraction of said head, said second rotational speed being maintained until said rotating means and loading means are again actuated for another read-write operation.
Claim 3
Dependent Claim
26 words
A disk drive according to claim 1, wherein said second rotational speed is 1/k of said first rotational speed, k being an integer greater than 1.
Claim 4
Dependent Claim
17 words
A disk drive according to claim 2, wherein said first rotational speed is 720 r.p.m. or greater.
Claim 5
Independent Claim
160 words
A method of driving a disk in a disk drive having means including a spindle for rotating said disk; means for pressing said disk onto said spindle; and loading means for bringing a read-write head into contact with said disk, said method comprising the steps of: clamping said disk between said spindle and said pressing means; actuating said rotating means to rotate at a first rotational speed during a time of recording and reproduction and simultaneously actuating said loading means during said time of recording and reproduction to bring said head into contact with said disk; decelerating said rotating means, upon completion of said recording and reproduction, to a second rotational speed which is less than said first rotational speed and greater than zero, and either simultaneously or at a predetermined time later, retracting said head from said disk; and maintaining said second rotational speed until said rotating means and loading means are again actuated for another recording and reproduction.
Claim 6
Independent Claim
160 words
A method of driving a disk in a disk drive having means including a spindle for rotating said disk; means for pressing said disk onto said spindle; and loading means for bringing a read-write head into contact with said disk, said method comprising the steps of: clamping said disk between said spindle and said pressing means; actuating said rotating means to rotate at a first rotational speed during a time of recording and reproduction and simultaneously actuating said loading means during said time of recording and reproduction to bring said head into contact with said disk; decelerating said rotating means, upon completion of said recording and reproduction, to a second rotational speed which is less than said first rotational speed and greater than zero, and either simultaneously or at a predetermined time later, retracting said head from said disk; and maintaining said second rotational speed until said rotating means and loading means are again actuated for another recording and reproduction.
Claim 7
Dependent Claim
86 words
A method according to claim 4, wherein said disk is provided with a center hole and said pressing means includes a collet by which said disk is guided, such that a center of said disk is brought substantially to a center of said spindle, said method further comprising the step of: prior to said clamping step, actuating said rotating means to rotate said spindle at said second rotational speed, said clamping step thereby being carried out while said spindle is rotated at said second rotational speed.
Claim 8
Dependent Claim
27 words
A disk drive according to claim 4, wherein said second rotational speed is 1/k of said first rotational speed, where k is an integer greater than 1.
Claim 9
Dependent Claim
16 words
A method according to claim 6, wherein said first rotational speed is 720 r.p.m. or greater.
Claim 10
Dependent Claim
25 words
A method according to claim 4, wherein said rotational speed is 1/k of said first rotational speed, where k is an integer greater than 1.
Claim 11
Dependent Claim
233 words
A disk drive to be connected to and controlled by a controller, comprising: clamping means for clamping a recording medium; a motor for rotating said recording medium clamped by said clamping means; a motor driving circuit for driving said motor to rotate at a predetermined rotational speed; loading means for bringing a read-write head into contact with said recording medium; and a control circuit for controlling said motor driving circuit and said loading means, said control circuit being arranged such that when said disk drive is selected by said controller to carry out a read-write operation, said control circuit controls said motor driving circuit to rotate said motor at a first rotational speed, and controls said loading means such that said read-write head approaches and makes contact with said recording medium; said control circuit being further arranged such that upon completion of said read-write operation, said control circuit controls said loading means such that said read-write head retracts from said recording medium, and controls said motor driving circuit to rotate said motor at a second rotational speed, which is less than said first rotational speed and greater than zero, either simultaneously with the completion of the retraction of said read-write operation or at a predetermined time after the completion of said read-write operation, said second rotational speed being maintained until said rotating means and loading means are again actuated for another read-write operation.
Claim 12
Dependent Claim
233 words
A disk drive to be connected to and controlled by a controller, comprising: clamping means for clamping a recording medium; a motor for rotating said recording medium clamped by said clamping means; a motor driving circuit for driving said motor to rotate at a predetermined rotational speed; loading means for bringing a read-write head into contact with said recording medium; and a control circuit for controlling said motor driving circuit and said loading means, said control circuit being arranged such that when said disk drive is selected by said controller to carry out a read-write operation, said control circuit controls said motor driving circuit to rotate said motor at a first rotational speed, and controls said loading means such that said read-write head approaches and makes contact with said recording medium; said control circuit being further arranged such that upon completion of said read-write operation, said control circuit controls said loading means such that said read-write head retracts from said recording medium, and controls said motor driving circuit to rotate said motor at a second rotational speed, which is less than said first rotational speed and greater than zero, either simultaneously with the completion of the retraction of said read-write operation or at a predetermined time after the completion of said read-write operation, said second rotational speed being maintained until said rotating means and loading means are again actuated for another read-write operation.
Claim 13
Dependent Claim
17 words
A disk drive according to claim 9, wherein said first rotational speed is 720 r.p.m. or greater.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |