Patent US3837073A successfully refreshed from Google Patents.
US3837073A
Expired / Lapsed
US
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Methods of manufacturing magnetic transducing heads
Assignee: Fujitsu Services Ltd
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Filing: 1973-06-05
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Granted: 1974-09-24
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Expires: 1993-06-05
Abstract
Abstract A method of manufacturing a component of a magnetic transducing head is disclosed in which ferrite strips are spaced apart by a non-magnetic gap and are then surrounded by a non-magnetic material. The resulting structure is divided into slices each of which contains a pair of ferrite portions with a predetermined gap between them. The slice may be profiled on one face for cooperation with a record disc and a yoke secured to the other face to complete the magnetic circuit.
Inventors
- 👤 D Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/455; G11B5/127; G11B5/1272; G11B5/133; G11B5/1335; G11B5/187; G11B5/193; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49004; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49048
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
A method of manufacturing a magnetic transducing head including the steps of bonding at least two elongate ferrite members in predetermined spaced relationship to form a nonmagnetic gap therebetween; surrounding the bonded ferrite members with a non-magnetic material to form an elongate assembly; making a plurality of spaced cuts through the assembly transverse to the length of the assembly to produce a plurality of separate slices of the assembly, each slice including a portion of each of said ferrite members separated by said predetermined non-magnetic gap and surrounded by a section of said non-magnetic material with opposite ends of the portions of the ferrite members being exposed in opposite faces of the slice.
Claim 2
Independent Claim
113 words
A method of manufacturing a magnetic transducing head including the steps of bonding at least two elongate ferrite members in predetermined spaced relationship to form a nonmagnetic gap therebetween; surrounding the bonded ferrite members with a non-magnetic material to form an elongate assembly; making a plurality of spaced cuts through the assembly transverse to the length of the assembly to produce a plurality of separate slices of the assembly, each slice including a portion of each of said ferrite members separated by said predetermined non-magnetic gap and surrounded by a section of said non-magnetic material with opposite ends of the portions of the ferrite members being exposed in opposite faces of the slice.
Claim 3
Dependent Claim
47 words
A method as claimed in claim 1 and including the steps of shaping one face of the slice for co-operation with a record medium to form the ends of the ferrite portions exposed in said one face into pole tips spaced apart by said predetermined non-magnetic gap.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 2 in which said one face of the slice is shaped so as to cause the magnetic head to fly out of contact over the record medium.
Claim 5
Dependent Claim
45 words
A method as claimed in claim 2 and including the step of positioning a magneTic yoke carrying a coil on the face opposite said one face of the slice, the yoke being aligned to complete a magnetic path between the ferrite portions in the slice.
Claim 6
Dependent Claim
44 words
A method as claimed in claim 1 including the steps of mounting the ferrite members in side-by-side relationship on a non-magnetic support spaced apart by said non-magnetic gap; reducing the thickness of at least one ferrite member adjacent the gap to a predetermined thickness.
Claim 7
Dependent Claim
50 words
A method as claimed in claim 1 including the steps of machining the bonded ferrite members to define a series of pairs of pole pieces of the desired shape and in which the spaced cuts are made at such positions that each slice contains a pair of shaped pole pieces.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 1 including the step of bonding three ferrite members together with two parallel non-magnetic gaps therebetween.
Claim 9
Dependent Claim
31 words
A method as claimed in claim 7 including the step of machining the bonded ferrite members so that one non-magnetic gap has a greater transverse width than the other non-magnetic gap.
References Cited (Backward Citations)
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US3514851A
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US3668775A
Cited
US3760494A
Cited
US3722081A
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |