US4661872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head unit for preventing head oscillation due to disequilibrium between head and recording medium
Assignee: Canon Electronics Inc
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Filing: 1984-08-17
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Granted: 1987-04-28
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Expires: 2004-08-17
Abstract
Abstract A head unit having a recording and/or reproducing head mounted on a resilient plate and having a contact surface which is brought into contact with a disc-like recording medium by depressing at a point which is located on the contact surface side remote from the center of displacement of the resilient plate. This arrangement prevents oscillation of the head caused by disequilibrium between the pressure of the contact surface of the head and sliding resistance of the recording medium during recording or reproducing, so that stable recording and/or reproducing is performed.
Inventors
- 👤 Makoto Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B21/00; G11B21/16; G11B21/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A head unit comprising: a head means having a first surface for recording or reproducing information on or from a recording medium while in contact with said recording medium, and a second surface which is opposite to said first surface; a head supporting member for supporting said head means at said second surface thereof, said supporting member permitting displacement of said head means in directions excluding displacement around an axis which is perpendicular to the first and second surfaces of said head means; and a depressing member for depressing said head means at a depressing position located between said first surface and said second surface, said depressing position being located substantially along said axis.
Claim 2
Dependent Claim
114 words
A head unit comprising: a head means having a first surface for recording or reproducing information on or from a recording medium while in contact with said recording medium, and a second surface which is opposite to said first surface; a head supporting member for supporting said head means at said second surface thereof, said supporting member permitting displacement of said head means in directions excluding displacement around an axis which is perpendicular to the first and second surfaces of said head means; and a depressing member for depressing said head means at a depressing position located between said first surface and said second surface, said depressing position being located substantially along said axis.
Claim 3
Dependent Claim
17 words
A head unit as claimed in claim 1, wherein said head supporting member includes a gimbal spring.
Claim 4
Dependent Claim
15 words
A head unit as claimed in claim 1, wherein said depressing member includes a pivot.
Claim 5
Dependent Claim
53 words
A head unit as claimed in claim 1, which further comprises another head means, another head supporting member and another depressing member, said another head means, another head supporting member and another depressing member being arranged in opposing relation to said head means, supporting member and depressing member relative to said recording medium.
Claim 6
Dependent Claim
31 words
A head unit as claimed in claim 1, wherein said second surface of said head means has a recess having a bottom surface, whereby said depressing member depresses said bottom surface.
Claim 7
Dependent Claim
37 words
A head unit as claimed in claim 1, wherein said recording medium is a magnetic recording medium and said head means includes a magnetic head for recording and/or reproducing information on and/or from said magnetic recording medium.
Claim 8
Dependent Claim
120 words
A magnetic head unit comprising: a magnetic recording and/or reproducing head having a first surface for recording and/or reproducing information on and/or from a magnetic recording medium while in contact with said magnetic recording medium, and a second surface which is opposite to said first surface and which has a recess having a bottom surface; a gimbal spring for supporting said magnetic head at said second surface thereof, said gimbal spring permitting displacement of said magnetic head in directions excluding the displacement around an axis which is perpendicular to said first surface and said second surface of said magnetic head; and a pivot for pressing said bottom surface of said recess at a position which is substantially along said axis.
Claim 9
Dependent Claim
120 words
A magnetic head unit comprising: a magnetic recording and/or reproducing head having a first surface for recording and/or reproducing information on and/or from a magnetic recording medium while in contact with said magnetic recording medium, and a second surface which is opposite to said first surface and which has a recess having a bottom surface; a gimbal spring for supporting said magnetic head at said second surface thereof, said gimbal spring permitting displacement of said magnetic head in directions excluding the displacement around an axis which is perpendicular to said first surface and said second surface of said magnetic head; and a pivot for pressing said bottom surface of said recess at a position which is substantially along said axis.
Claim 10
Dependent Claim
53 words
A magnetic head unit as claimed in claim 7, which further comprises another magnetic recording and/or reproducing head, another gimbal spring and another pivot, said another magnetic head, another gimbal spring and another pivot being arranged in opposing relation to said magnetic head, gimbal spring and pivot relative to said magnetic recording medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |