EP0264535A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Shock and vibration disturbance compensation system for disc drives
Assignee: HP Inc
•
Filing: 1987-05-06
•
Granted: —
•
Expires: 2007-05-06
Abstract
Abstract An accelerometer (7) or other shock detecting device is mounted on a disc drive chassis (l) to detect accelerations of the chassis (l) due to externally applied shock forces and to internally generated vibration. The accelerometer (7) provides a compensation signal to the disc drive head tracking circuitry (26,27,28,24,25) to compensate for head tracking errors due to the shock or vibration induced movements of the chassis (l). The accelerometer (7) is mounted within the shock absorption system (2l) in order to detect the shock or vibration which actually accelerates the chassis (l).
Inventors
- 👤 Vernon L. Knowles
- 👤 Darwin M. Hanks
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 08:44
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/10; G11B21/106; G11B33/00; G11B33/02; G11B33/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
Apparatus for reducing transducer tracking errors caused by shock and vibration disturbances in a disc drive, said apparatus comprising: a chassis (l); rotatable storage media (2) mounted on said chassis (l); at least one transducer (9) mounted on said chassis (l) adjacent said storage media (2) for movement relative to a major surface of said storage media (2); and transducer positioning means (3,5) for positioning said transducer (9) to a desired position adjacent said media (2) surface; characterized in that shock sensing means (7) are mounted on said chassis (l) for sensing shock forces and vibration disturbances and generating a first signal indicative of the magnitude of said shock force and vibration disturbances, and in that said transducer positioning means (3,5) are responsive to said first signal for adjusting the position of said transducer (9) to compensate for displacement of said chassis (l) caused by said shock forces and vibration disturbances.
Claim 2
Dependent Claim
151 words
Apparatus for reducing transducer tracking errors caused by shock and vibration disturbances in a disc drive, said apparatus comprising: a chassis (l); rotatable storage media (2) mounted on said chassis (l); at least one transducer (9) mounted on said chassis (l) adjacent said storage media (2) for movement relative to a major surface of said storage media (2); and transducer positioning means (3,5) for positioning said transducer (9) to a desired position adjacent said media (2) surface; characterized in that shock sensing means (7) are mounted on said chassis (l) for sensing shock forces and vibration disturbances and generating a first signal indicative of the magnitude of said shock force and vibration disturbances, and in that said transducer positioning means (3,5) are responsive to said first signal for adjusting the position of said transducer (9) to compensate for displacement of said chassis (l) caused by said shock forces and vibration disturbances.
Claim 3
Dependent Claim
26 words
Apparatus as in claim l, characterized by a frame (l9) and shock absorbing means (2l) on said frame (l9) for mounting and supporting said chassis (l).
Claim 4
Dependent Claim
125 words
Apparatus as in claim l or 2, characterized in that said transducer positioning means (3,5) comprises: a pivot assembly (l5) mounted to said chassis (l); an elongated actuator arm (3) having one end pivotally mounted to said pivot assembly (l5) and extending from said pivot assembly (l5); transducer support means (5) fixedly attached to the other end of said elongated actuator arm (3) extending outwardly therefrom, said head support means (l3) including a plurality of flexible support arm (l3) for mounting at least one transducer (9); and motor means (ll) responsive to a control signal for pivoting said elongated actuator arm (3) about said pivot assembly (l5) such that said transducer (9) is positioned to and tracks said desired position adjacent said media (2) surface.
Claim 5
Dependent Claim
107 words
Apparatus as in any one of the preceding claims further including control means, characterized by: tracking servo means (26,28) providing a second signal indicative of the actual position of said transducer (9) relative to said media (2) surface; amplifier means (22) coupled to said shock sensing means (7) for amplifying and scaling said first signal providing a shock compensation signal; and summer means (24) coupled to said tracking servo means (26,28) and said amplifier means (22) having an input for receiving a transducer position signal, said summer means (24) summing said shock compensation signal, said transducer position signal and said second signal to provide said control signal.
Claim 6
Dependent Claim
40 words
Apparatus as in any one of the preceding claims, characterized in that said shock sensing means (7) is an accelerometer mounted on said chassis (l) for detecting accelerations of said chassis (l) in the direction of said transducer (9) movement.
Claim 7
Dependent Claim
48 words
Apparatus as in one of claims 3 to 5, characterized in that said actuator arm (3) is pivotally mounted to said chassis (l) and has an axis of rotation parallel with the axis of rotation of said rotatable storage media (2) and supports at least one transducer (9).
Claim 8
Dependent Claim
33 words
Apparatus as in either one of claims 5 and 6, characterized in that said accelerometer (7) is disposed on said chassis (l) adjacent the center of percussion of said elongated actuator arm (3).
Claim 9
Dependent Claim
72 words
Apparatus as in one of claims l, 2, 4 or 5, characterized in that said transducer positioning means comprises a support carriage (39) mounted on said chassis (l); and motor means (37) responsive to a control signal for moving said support carriage (39) to position and maintain said transducer (9) over a desired data track (8) on said rotatable storage media (2) and for moving said transducer (9) from track to track.
Claim 10
Dependent Claim
147 words
Method for minimizing external shock and vibration induced transducer tracking errors in a rotating disc storage system including a chassis (l), at least one rotating data storage disc (2), at least one transducer (9) supported adjacent the major surfaces of said disc (2), and a transducer actuator assembly (3,5) for supporting and positioning said transducer (9) at a desired one of a multiplicity of concentric data tracks (8) on said data disc (2), characterized by the steps of: mounting a shock sensing means (7) on said chassis (l); determining the magnitude of shock and vibration force; generating a compensation signal indicative of the magnitude of said shock and vibration force; applying said compensation signal to said actuator assembly (3,5); and adjusting the position of said transducer (9) relative to said storage disc (2) to compensate for shock and vibration induced acceleration and displacement of said chassis (l).
Claim 11
Dependent Claim
147 words
Method for minimizing external shock and vibration induced transducer tracking errors in a rotating disc storage system including a chassis (l), at least one rotating data storage disc (2), at least one transducer (9) supported adjacent the major surfaces of said disc (2), and a transducer actuator assembly (3,5) for supporting and positioning said transducer (9) at a desired one of a multiplicity of concentric data tracks (8) on said data disc (2), characterized by the steps of: mounting a shock sensing means (7) on said chassis (l); determining the magnitude of shock and vibration force; generating a compensation signal indicative of the magnitude of said shock and vibration force; applying said compensation signal to said actuator assembly (3,5); and adjusting the position of said transducer (9) relative to said storage disc (2) to compensate for shock and vibration induced acceleration and displacement of said chassis (l).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.