Active protection system

• US 7,477,469 B2
• Filed: 11/28/2006
• Issued: 01/13/2009
• Est. Priority Date: 04/27/2006
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Chang, JyeKai K., Hatfield, James Carl Jr., Haines, Jonathan Williams, Cook, Brett Alan
• Primary Examiner(s): Nguyen; Hoa T.
• Assistant Examiner(s): HABERMEHL, JAMES LEE
• Application Number:
  US11/605,900
• Publication Number:
  US 20070253093A1
• Time in Patent Office: 777 Days
• Field of Search: None
• US Class Current: 360/75
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 19/042 due to external shock or vibration
• CPC Class Codes: G11B 19/043 by detecting a free-fall condition

Abstract

Method and apparatus for actively protecting a device from damage due to an impact or other acceleration condition. An active protection system is provided with a sensor which outputs an acceleration signal in relation to an acceleration state of the device. A circuit processes the acceleration signal in relation to a configuration control input indicative of an operational environment in which the device is operated, and a protection mechanism configures the device in relation to the processed acceleration signal. A configuration control module preferably supplies the configuration control input as a user selectable or host input. Preferably, protection mechanism places the device in a protective state to protect against damage due to an imminent impact, such as from a free fall condition. The processing preferably comprises adaptive filtering of the acceleration signal and the application of one or more thresholds to detect said imminent impact.

Claims

1. An apparatus comprising:

a sensor which outputs an acceleration signal in relation to an acceleration state of a device;

a circuit which processes the acceleration signal in relation to a configuration control input indicative of an operational environment in which the device is operated, wherein said circuit filters the acceleration signal to provide a filtered acceleration signal and wherein said filtering is adaptively modified in relation to the configuration control input; and

a protection mechanism which configures the device in relation to said processing of the acceleration signal by the circuit.

2. The apparatus of claim 1, further comprising a configuration control module which supplies the configuration control input to the circuit.

3. The apparatus of claim 2, wherein the configuration control module identifies a plurality of environmental modes each individually selectable by a user of the device.

4. The apparatus of claim 2, wherein the configuration control module provides the configuration control input from a host with which the device is associated.

5. The apparatus of claim 1, wherein the circuit generates an imminent impact signal when said processing indicates that the device is in an imminent impact state, and wherein the protection mechanism operates responsive to the imminent impact signal to place the device in a protective state to protect against damage as a result of said imminent impact.

6. The apparatus of claim 1, wherein said processing further comprises comparing the filtered acceleration signal to a selected threshold.

7. The apparatus of claim 1, wherein the device comprises a data storage device, and wherein the protection mechanism comprises a controller which directs a data transducer to move to a load/unload ramp structure.

8. The apparatus of claim 1, wherein the acceleration signal comprises a first acceleration component in a first direction and a second acceleration component in a second direction orthogonal to the first direction, and wherein the processing comprises detecting a free fall condition in relation to a cross-over condition of said first and second components and in relation to a magnitude of a composite acceleration value determined from the first and second components.

9. An apparatus comprising:

a sensor which outputs an acceleration signal in relation to an acceleration state of a device; and

first means for configuring the device in relation to the acceleration signal and a configuration control input indicative of a selected operational environment in which the device is operated, wherein the first means selectively filters the acceleration signal and selectively applies a threshold to said filtered acceleration signal.

10. The apparatus of claim 9, further comprising a configuration control module comprises a plurality of environmental modes each individually selectable by a user of the device.

11. The apparatus of claim 9, wherein the device comprises a data storage device, and wherein the first means comprises a controller which directs a data transducer to move to a load/unload ramp structure.

12. A method comprising:

providing an acceleration signal in relation to an acceleration state of a device;

adaptively filtering the acceleration signal in relation to a configuration control input indicative of an operational environment in which the device is operated; and

configuring the device in relation to said adaptively filtering step.

13. The method of claim 12, wherein the configuration control input of the adaptively filtering step comprises an environmental mode selected by a user of the device from a plurality of such modes.

14. The method of claim 12, further comprising generating an imminent impact signal when said adaptively filtering indicates that the device is in an imminent impact state, and wherein the configuring step comprises placing the device in a protective state to protect against damage as a result of said imminent impact.

15. The method of claim 12, wherein the acceleration signal of the providing step comprises a first acceleration component in a first direction and a second acceleration component in a second direction orthogonal to the first direction, and wherein the adaptively filtering step comprises detecting a free fall condition in relation to a cross-over condition of said first and second components and in relation to a magnitude of a composite acceleration value determined from the first and second components.

16. The method of claim 12, wherein the device comprises a data storage device, and wherein the configuring step comprises moving a data transducer to move to a load/unload ramp structure.

17. A method comprising:

providing a plurality of acceleration signal axial components in relation to an acceleration state of a device; and

detecting a free fall state of the device in relation to respective changes in phase of at least two of said acceleration signal axial components, the detecting step comprising generating a composite acceleration signal from said plurality of acceleration signal axial components, and detecting the free fall state in relation to a magnitude of the composite acceleration signal when the magnitude of the composite acceleration signal is determined to be near 1 g, a first one of the plurality of acceleration signal axial components crosses a threshold T in a first polarity direction, and a second one of the plurality of acceleration signal axial components crosses the threshold T in a second opposite polarity direction.

18. The method of claim 17, further comprising a step of configuring the device in relation to the detecting step.