US3670112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air bearing magnetic head with glass slider body
Assignee: International Business Machines Corp
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Filing: 1969-08-18
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Granted: 1972-06-13
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Expires: 1989-08-18
Abstract
Abstract An air bearing slider assembly includes a U-shaped magnetic head and a monolithic glass body which is formed in the glassy state so as to chemically as well as physically bond the head thereto, a nonmagnetic gap in the base of the head being disposed at an air bearing surface of the glass body to facilitate noncontact magnetic recording. The slider assembly is fabricated using a mold having a central cavity which defines the desired configuration of the glass body and which positions the magnetic head at a selected location relative to the glass body to be formed. The mold cavity is filled with a fluid glass composition which solidifies as a monolithic body in bonded relation to the head.
Inventors
- 👤 James F Ruszczyk
- 👤 Duane R Secrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
199 words
A magnetic head assembly for use in non-contact recording comprising: at least one generally U-shaped magnetic head having a pair of leg portions joined by a base portion, said base portion including a non-magnetic gap; a transparent monolithic body of substantially glass composition encompassing and in chemical bonding contact with said head, said body having a base surface substantially continuous with the base portion of the head and a recessed portion at the ends of the leg portions opposite the base portion of the head for receiving a bridging core element, said recessed portion comprising a first elongated recessed portion having a pair of walls in chemical bonding contact with different ones of the pair of leg portions of the head and a second elongated recessed portion extending between the pair of walls, said glass being formed from the fluid glassy state and having a temperature coefficient of expansion within the range of 80-110 X 10 7/*C.; a bridging core element disposed within said first elongated recessed portion of the body against said pair of leg portions away from said base; and means for maintaining said core element in contact with the pair of leg portions of the head.
Claim 2
Dependent Claim
199 words
A magnetic head assembly for use in non-contact recording comprising: at least one generally U-shaped magnetic head having a pair of leg portions joined by a base portion, said base portion including a non-magnetic gap; a transparent monolithic body of substantially glass composition encompassing and in chemical bonding contact with said head, said body having a base surface substantially continuous with the base portion of the head and a recessed portion at the ends of the leg portions opposite the base portion of the head for receiving a bridging core element, said recessed portion comprising a first elongated recessed portion having a pair of walls in chemical bonding contact with different ones of the pair of leg portions of the head and a second elongated recessed portion extending between the pair of walls, said glass being formed from the fluid glassy state and having a temperature coefficient of expansion within the range of 80-110 X 10 7/*C.; a bridging core element disposed within said first elongated recessed portion of the body against said pair of leg portions away from said base; and means for maintaining said core element in contact with the pair of leg portions of the head.
Claim 3
Dependent Claim
17 words
A magnetic head assembly in accordance with claim 1, wherein the head is substantially of ferrite material.
Claim 4
Dependent Claim
248 words
A magnetic head assembly for use in non-contact recording comprising: a monolithic glass slider element having a base surface and a recess, said recess extending into the element from a surface opposite the base surface through a portion of the thickness of the element therebetween and having a cross-section in plan which is generally T-shaped and which defines a leg portion and a crossbar portion thereof, said glass being formed from the fluid glassy state and having a temperature coefficient of expansion within the range of 80-110 X 10 7/* C.; a generally U-shaped, relatively flat, recording head having opposite legs joined by a base, said head having a non-magnetic gap which extends inwardly from an edge of the base thereof, said edge of the base being substantially continuous with the base surface of the glass element and said recording head being disposed within and in chemical bonding contact with the glass element such that the base and a portion of each leg adjacent thereto extend between the base surface of the glass element and the recess therein, and the remaining portion of each leg is in chemical bonding contact with a different one of the walls of the crossbar portion of the recess immediately adjacent and on opposite sides of the leg portion thereof, a bridging core element disposed within the recess against said opposite legs away from said base; and means for maintaining said core element in contact with said opposite legs away from said base.
Claim 5
Dependent Claim
248 words
A magnetic head assembly for use in non-contact recording comprising: a monolithic glass slider element having a base surface and a recess, said recess extending into the element from a surface opposite the base surface through a portion of the thickness of the element therebetween and having a cross-section in plan which is generally T-shaped and which defines a leg portion and a crossbar portion thereof, said glass being formed from the fluid glassy state and having a temperature coefficient of expansion within the range of 80-110 X 10 7/* C.; a generally U-shaped, relatively flat, recording head having opposite legs joined by a base, said head having a non-magnetic gap which extends inwardly from an edge of the base thereof, said edge of the base being substantially continuous with the base surface of the glass element and said recording head being disposed within and in chemical bonding contact with the glass element such that the base and a portion of each leg adjacent thereto extend between the base surface of the glass element and the recess therein, and the remaining portion of each leg is in chemical bonding contact with a different one of the walls of the crossbar portion of the recess immediately adjacent and on opposite sides of the leg portion thereof, a bridging core element disposed within the recess against said opposite legs away from said base; and means for maintaining said core element in contact with said opposite legs away from said base.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |