Patent US5663847A successfully refreshed from Google Patents.
US5663847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rejection of disturbances on a disk drive by use of an accelerometer
Assignee: Hewlett Packard Development Co LP
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Filing: 1995-03-27
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Granted: 1997-09-02
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Expires: 2015-03-27
Abstract
Abstract A disk recording and/or reproduction device subject to shock and vibration. The track following function of the transducer is augmented by an acceleration responsive sensor. The acceleration responsive sensor is sampled at a different frequency than the sampling frequency of the head disk assembly position error signal. The variations in the gain of the acceleration responsive sensors can be compensated for in real time.
Inventors
- 👤 Daniel Y. Abramovitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5582; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/0888
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
A disk recording/reproducing device, comprising: a disk rotatably mounted on the device, the disk having a surface containing recording tracks; a transducer coupled to the surface for producing an output of the position of the transducer with respect to a track; a moveable actuator connected to the transducer for moving the transducer to different radial locations with respect to the track; an actuator controller receiving and sampling at a first frequency the output of the transducer for controlling the moveable actuator to maintain the transducer position with respect to the recording track; a sensor having an output responsive to the acceleration of the device; and an acceleration controller receiving and sampling at a second frequency the output of the sensor for additionally controlling the moveable actuator to further maintain the transducer position with respect to the recording track when the device is being accelerated.
Claim 2
Dependent Claim
144 words
A disk recording/reproducing device, comprising: a disk rotatably mounted on the device, the disk having a surface containing recording tracks; a transducer coupled to the surface for producing an output of the position of the transducer with respect to a track; a moveable actuator connected to the transducer for moving the transducer to different radial locations with respect to the track; an actuator controller receiving and sampling at a first frequency the output of the transducer for controlling the moveable actuator to maintain the transducer position with respect to the recording track; a sensor having an output responsive to the acceleration of the device; and an acceleration controller receiving and sampling at a second frequency the output of the sensor for additionally controlling the moveable actuator to further maintain the transducer position with respect to the recording track when the device is being accelerated.
Claim 3
Dependent Claim
12 words
The device according to claim 1, wherein the sensor is an accelerometer.
Claim 4
Dependent Claim
27 words
The device according to claim 1, wherein the device further comprises a plurality of sensors and a plurality of acceleration controllers for additionally controlling the moveable actuator.
Claim 5
Dependent Claim
23 words
The device according to claim 3, wherein the plurality of acceleration controllers sample the plurality of sensors at a plurality of sampling frequencies.
Claim 6
Dependent Claim
11 words
The device according to claim 4, wherein the sensors are accelerometers.
Claim 7
Dependent Claim
38 words
The device according to claim 4, wherein the device further comprises a plurality of accelerometer signal processors for filtering and adapting the outputs of the sensors before the sensor outputs are received by the plurality of acceleration controllers.
Claim 8
Dependent Claim
34 words
The device according to claim 1, wherein the device further comprises an accelerometer signal processor for filtering and adapting the output of the sensor before the sensor output is received by the acceleration controller.
Claim 9
Dependent Claim
40 words
The device according to claim 7, wherein the device further comprises a threshold detector for determining when a function of the output of the sensor is below a predetermined value and turning the adaptation of the accelerometer signal processor off.
Claim 10
Independent Claim
156 words
A method of maintaining a transducer position with respect to a recording track in a disk recording/reproducing device having a rotatable mounted disk having a surface containing recording tracks, a transducer coupled to the surface for producing an output with respect to the position of the tracks, a moveable actuator connected to the transducer for moving the transducer to different radial locations with respect to the recording tracks, a sensor having an output responsive to the acceleration of the device, the method comprising the steps of: a. sampling the transducer output at a first frequency and processing the sampled output in an actuator controller for controlling the moveable actuator which maintains the transducer position with respect to the recording track; b. sampling the sensor output at a second frequency and processing the sampled output with an acceleration controller for additionally controlling the moveable actuator which further maintains the transducer position with respect to the recording track.
Claim 11
Independent Claim
156 words
A method of maintaining a transducer position with respect to a recording track in a disk recording/reproducing device having a rotatable mounted disk having a surface containing recording tracks, a transducer coupled to the surface for producing an output with respect to the position of the tracks, a moveable actuator connected to the transducer for moving the transducer to different radial locations with respect to the recording tracks, a sensor having an output responsive to the acceleration of the device, the method comprising the steps of: a. sampling the transducer output at a first frequency and processing the sampled output in an actuator controller for controlling the moveable actuator which maintains the transducer position with respect to the recording track; b. sampling the sensor output at a second frequency and processing the sampled output with an acceleration controller for additionally controlling the moveable actuator which further maintains the transducer position with respect to the recording track.
Claim 12
Dependent Claim
52 words
The method according to claim 9, further comprising; c. sampling a plurality of sensors outputs at a plurality of sampling frequency and processing the plurality of sampled outputs with a plurality of acceleration controllers for additionally controlling the moveable actuator which further maintains the transducer position with respect to the recording track.
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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) | 2000-09-01 | 2001-03-03 | 2001-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-01 | 2005-03-03 | 2005-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-01 | 2009-03-03 | 2009-09-02 | $7700.00 | Window Closed / Lapsed |