Patent US4039412A successfully refreshed from Google Patents.
US3676874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid supported pad with means to produce contact between head and record medium
Assignee: Fujitsu Services Ltd
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Filing: 1970-03-09
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Granted: 1972-07-11
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Expires: 1990-03-09
Abstract
Abstract A magnetic transducing head assembly with a magnetic head being maintained in contact with a record member during relative motion between the head and record member. The head is resiliently mounted on a pad by a diaphragm. A source of pressure produces a cushion of air which separates the pad from the record member by a desired distance with the head protruding from the pad by at least the desired distance. The diaphragm urges the head into contact with the record member when the pad is separated from the record member by the desired distance. In another embodiment, high and low pressure areas are produced to separate the pad from the record member and to maintain the head in contact with the record member.
Inventors
- 👤 Ian Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A magnetic recording assembly including a rotatable record disc having a substantially planar recording surface; a magnetic head having a flat face engaging said recording surface; a pad having apertures therein; a resilient member extending around the head and connecting the head to the pad, said resilient member permitting the head to pivot relatively to the plane of the recording surface; a source of pressurized fluid connected to the apertures in the pad for producing fluid flow from the apertures toward the recording surface effective to produce a cushion fluid supporting the pad spaced from the recording surface by a distance such that the pad exerts, through the resilient member, a pressure on the head toward the recording surface to maintain the flat face of the head in engagement with the recording surface.
Claim 2
Dependent Claim
133 words
A magnetic recording assembly including a rotatable record disc having a substantially planar recording surface; a magnetic head having a flat face engaging said recording surface; a pad having apertures therein; a resilient member extending around the head and connecting the head to the pad, said resilient member permitting the head to pivot relatively to the plane of the recording surface; a source of pressurized fluid connected to the apertures in the pad for producing fluid flow from the apertures toward the recording surface effective to produce a cushion fluid supporting the pad spaced from the recording surface by a distance such that the pad exerts, through the resilient member, a pressure on the head toward the recording surface to maintain the flat face of the head in engagement with the recording surface.
Claim 3
Dependent Claim
28 words
A magnetic recording assembly as claimed in claim 1 in which the pad is an annular shaped member and the magnetic head is positioned centrally of the pad.
Claim 4
Dependent Claim
18 words
A magnetic recording assembly as claimed in claim 2 in which the resilient member consists of a diaphragm.
Claim 5
Dependent Claim
74 words
A magnetic recording assembly as claimed in claim 3 in which the diaphragm has apertures therein and including a source of low pressure connected through said apertures to a region between the diaphragm and the recording surface to produce a low pressure in said region acting in opposition to said cushion of fluid and effective in combinatiOn with said cushion of fluid to maintain the pad spaced from the recording surface by said distance.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |