US4636898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multichannel magnetic head
Assignee: Fujifilm Holdings Corp
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Filing: 1985-07-19
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Granted: 1987-01-13
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Expires: 2005-07-19
Abstract
Abstract A multichannel magnetic recording/reproducing head for which the amount of waving of the tape is significantly reduced and contamination of the recording/reproducing gaps of the head by dust or the like is substantially eliminated. A plurality of parallel grooves are formed on a tape-contact surface of the head, inclined with respect to a running direction of the magnetic tape and provided at least at a tape-entrance side of the surface. The inclination of the grooves is within an angular range of 1 to 30 degrees with respect to the tape running direction, and the depth of the grooves is within a range of 0.1 to 20 microns.
Inventors
- 👤 Masaki Suzuki, deceased
- 👤 Goro Akashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/41; G11B15/00; G11B15/60; G11B15/602; G11B15/62; G11B5/127; G11B5/29; G11B5/295
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A multichannel magnetic head for simultaneously performing recording/reproducing on multiple tracks on a magnetic tape and having a tape-contact surface and a plurality or recording/reproducing gaps located on said surface, the improvement wherein a plurality of parallel grooves, inclined with respect to a direction of running of said magnetic tape, are provided at least on said tape-contact surface of said head at a tape-entrance side thereof.
Claim 2
Dependent Claim
66 words
A multichannel magnetic head for simultaneously performing recording/reproducing on multiple tracks on a magnetic tape and having a tape-contact surface and a plurality or recording/reproducing gaps located on said surface, the improvement wherein a plurality of parallel grooves, inclined with respect to a direction of running of said magnetic tape, are provided at least on said tape-contact surface of said head at a tape-entrance side thereof.
Claim 3
Dependent Claim
32 words
The multichannel magnetic head according to claim 1, wherein an angle of inclination of said grooves in within a range of 1 to 30 degrees with respect to a tape running direction.
Claim 4
Dependent Claim
23 words
The multichannel magnetic head according to claim 1, wherein a depth of said grooves in within a range from 0.1 to 20 microns.
Claim 5
Dependent Claim
22 words
The multichannel magnetic head according to claim 1, wherein a pitch of said grooves substantially coincides with a pitch of said tracks.
Claim 6
Dependent Claim
16 words
The multichannel magnetic head according to claim 1, wherein said grooves are rectangular in cross section.
Claim 7
Dependent Claim
16 words
The multichannel magnetic head according to claim 1, wherein said grooves have a rounded bottom portion.
Claim 8
Dependent Claim
20 words
The multichannel magnetic head according to claim 1, wherein said grooves have a wavy bottom having a plurality of undulations.
Claim 9
Dependent Claim
21 words
The multichannel magnetic head according to claim 1, wherein said magnetic gaps extend orthogonal to a longitudinal direction of said grooves.
Claim 10
Dependent Claim
37 words
The multichannel magnetic head according to claim 1, wherein a longitudinal groove is formed on said tape-contact surface extending along said head gaps perpendicular to said tape running direction, said first-mentioned grooves communicating with said longitudinal groove.
References Cited (Backward Citations)
JPS57200922A
Cited
JPS59213013A
Cited
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 |