Patent US3577634A successfully refreshed from Google Patents.
US3577634A
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US
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Method of manufacturing a magnetic head assembly
Assignee: International Business Machines Corp
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Filing: 1969-06-18
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Granted: 1971-05-04
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Expires: 1989-06-18
Abstract
Abstract A magnetic head slider assembly, used in disc storage files for air bearing noncontact recording is formed from three parts that enclose a glass-bonded ferrite core. During manufacture, a high temperature glass is used to form the nonmagnetic gap in the core, and a low temperature glass is disposed adjacent to the gap glass between the pole pieces of the core. When the core is positioned within a cavity of the slider, the core containing both glasses is heated sufficiently to cause only the low temperature glass to flow and fill the cavity, thereby bonding the core to an inner wall of the cavity within the slider assembly.
Inventors
- 👤 Duane R Secrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:26
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/133; G11B5/1335; G11B5/10; G11B5/187; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49027; Y10T29/4903; Y10T29/49032; Y10T29/49055; Y10T29/49057
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A method of manufacturing a magnetic head assembly comprising the steps of: joining two blocks of magnetic material with a high temperature glass to define a nonmagnetic gap, said blocks having a channel therebetween; joining a low temperature glass to said blocks within said channel; dividing said joined blocks to form transducer elements including the nonmagnetic gap with high temperature glass, and with low temperature glass disposed between opposing legs of each transducer element; assembling the transducer element to a wall of a housing by supporting said element in proximity with said housing and heating the low temperature glass, thereby causing same to flow and form a bond between the transducer and the housing.
Claim 2
Independent Claim
114 words
A method of manufacturing a magnetic head assembly comprising the steps of: joining two blocks of magnetic material with a high temperature glass to define a nonmagnetic gap, said blocks having a channel therebetween; joining a low temperature glass to said blocks within said channel; dividing said joined blocks to form transducer elements including the nonmagnetic gap with high temperature glass, and with low temperature glass disposed between opposing legs of each transducer element; assembling the transducer element to a wall of a housing by supporting said element in proximity with said housing and heating the low temperature glass, thereby causing same to flow and form a bond between the transducer and the housing.
Claim 3
Dependent Claim
30 words
A method as in claim 1, including the step of positioning said transducer element in a slot formed in said housing prior to bonding of said transducer to said housing.
Claim 4
Dependent Claim
23 words
A method as in claim 2, wherein said positioning step further includes the step of tilting said transducer element towards the housing wall.
Claim 5
Dependent Claim
26 words
A method as in claim 1, including the step of placing spacer shims between said two blocks to establish the gap length before joining said blocks.
Claim 6
Dependent Claim
24 words
A method as in claim 4, wherein said high temperature glass moves into the gap region, established by said spacer shims, by capillary action.
Claim 7
Dependent Claim
42 words
A method as in claim 1, wherein said heating for the low temperature sealing process is achieved by application of infrared radiation in which the ferrite legs of said transducer element are selectively heated when relatively noninfrared absorbing sealing glasses are employed.
References Cited (Backward Citations)
US3094772A
Cited
US3177495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |