US4636893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric driven mass storage
Assignee: Eastman Kodak Co
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Filing: 1985-09-06
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Granted: 1987-01-13
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Expires: 2005-09-06
Abstract
Abstract A planar array of high track density magnetic heads is mounted on a piezoelectric structural member. The heads are in contact with an area of magnetic recording medium coated onto a stationary support member located adjacent the head array structure. A repetitive ramp voltage is applied to the piezoelectric member causing repetitive linear extension of the member with resultant relative motion between the head array and the medium. A position transducer provides a feedback signal which monitors the position of the head array in relation to the magnetic medium, and this feedback signal is used to servo control the motion of the head array. Recording and playback of the stored information occurs coincidentally with the movement of the head array relative to the medium.
Inventors
- 👤 Richard J. McClure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B15/00; G11B15/02; G11B15/12; G11B15/14; G11B5/02; G11B5/09; G11B5/48; G11B5/488; G11B5/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
Apparatus for the magnetic recording and playback of digital information, comprising: a. a magnetic transducer comprising a planar array of magnetic cores arranged in rows and columns, b. means for supporting a magnetic medium comprised of a planar surface of magnetic material, said means for supporting being cooperative with said magnetic transducer for the recording and playback of said information on and from said medium, and c. piezoelectric displacement means for cyclically effecting the movement of said array of magnetic cores relative to said means for supporting, wherein said cores contact substantially all of said magnetic medium surface for the purpose of recording and playback of said information.
Claim 2
Dependent Claim
108 words
Apparatus for the magnetic recording and playback of digital information, comprising: a. a magnetic transducer comprising a planar array of magnetic cores arranged in rows and columns, b. means for supporting a magnetic medium comprised of a planar surface of magnetic material, said means for supporting being cooperative with said magnetic transducer for the recording and playback of said information on and from said medium, and c. piezoelectric displacement means for cyclically effecting the movement of said array of magnetic cores relative to said means for supporting, wherein said cores contact substantially all of said magnetic medium surface for the purpose of recording and playback of said information.
Claim 3
Independent Claim
116 words
A method of magnetic recording and playback of digital information on a magnetic medium by use of a transducer having an array of magnetic cores arranged in rows and columns, said transducer being mounted on a piezoelectrically extensible member, said method comprising the steps of: a. piezoelectrically extending and retracting said extensible member, resulting in cyclical movement of said array across said medium in a direction parallel to said columns, b. during said movement of said array for recording, selectively energizing said cores to form thereby areally disposed islands of recorded information within said medium, and c. during said movement of said array for playback, selecting said cores for playback of said islands of recorded information.
Claim 4
Independent Claim
116 words
A method of magnetic recording and playback of digital information on a magnetic medium by use of a transducer having an array of magnetic cores arranged in rows and columns, said transducer being mounted on a piezoelectrically extensible member, said method comprising the steps of: a. piezoelectrically extending and retracting said extensible member, resulting in cyclical movement of said array across said medium in a direction parallel to said columns, b. during said movement of said array for recording, selectively energizing said cores to form thereby areally disposed islands of recorded information within said medium, and c. during said movement of said array for playback, selecting said cores for playback of said islands of recorded information.
Claim 5
Dependent Claim
25 words
The method of claim 2 wherein the maximum displacement of said array during said movement is less than the row-to-row separation of said magnetic cores.
Claim 6
Dependent Claim
175 words
Apparatus for the magnetic recording and playback of digital information, comprising: a. first and second structural members adjacently disposed for relative movement, wherein said first structural member is of a piezoelectric material and is disposed for longitudinal extension, and said second structural member is rigidly disposed, b. magnetic medium means for the storage of said information, said magnetic medium means being mounted on said second structural member, c. a magnetic transducer mounted on said first structural member, said magnetic transducer comprising a planar array of magnetic cores disposed for recording and playback of said digital information, wherein said cores cooperate with said magnetic medium so that, in effecting recording, isolated recorded zones are areally disposed on said magnetic medium means, and in effecting playback, said cores are disposed for playback of said recorded zones, and d. electrical excitation means drivingly associated with said first structural member, wherein said first member is piezoelectrically extended and retracted to provide relative movement between said transducer and said magnetic medium means for the recording and playback of said information.
Claim 7
Dependent Claim
175 words
Apparatus for the magnetic recording and playback of digital information, comprising: a. first and second structural members adjacently disposed for relative movement, wherein said first structural member is of a piezoelectric material and is disposed for longitudinal extension, and said second structural member is rigidly disposed, b. magnetic medium means for the storage of said information, said magnetic medium means being mounted on said second structural member, c. a magnetic transducer mounted on said first structural member, said magnetic transducer comprising a planar array of magnetic cores disposed for recording and playback of said digital information, wherein said cores cooperate with said magnetic medium so that, in effecting recording, isolated recorded zones are areally disposed on said magnetic medium means, and in effecting playback, said cores are disposed for playback of said recorded zones, and d. electrical excitation means drivingly associated with said first structural member, wherein said first member is piezoelectrically extended and retracted to provide relative movement between said transducer and said magnetic medium means for the recording and playback of said information.
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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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |