US4638387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for sliding contact part of recording/reproducing apparatus
Assignee: Alps Alpine Co Ltd
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Filing: 1983-12-05
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Granted: 1987-01-20
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Expires: 2003-12-05
Abstract
Abstract A recording/reproducing apparatus is disclosed, characterized in that a sliding contact part coming into sliding contact with a magnetic recording medium is provided at the upstream side, as determined by the running direction of the magnetic recording medium, of a magnetic head core, and at least a portion of the sliding contact part coming into sliding contact with the magnetic recording medium is made of a composite material comprising a carbonaceous material and a mechanical strength-increasing material. This is applicable to a magnetic head, an erasing head, a pad for a magnetic head, and a running guide member.
Inventors
- 👤 Koichi Mukasa
- 👤 Takashi Hatanai
- 👤 Keishi Nakashima
- 👤 Kazumasa Onishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/255
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A recording/reproducing apparatus characterized in that a sliding contact part coming into sliding contact with a magnetic recording medium is provided adjacent a magnetic head core on an upstream side thereof, as determined by a running direction of the magnetic recording medium relative to the magnetic head core, and at least a portion of the sliding contact part, said portion coming into sliding contact with the magnetic recording medium, is made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material.
Claim 2
Dependent Claim
88 words
A recording/reproducing apparatus characterized in that a sliding contact part coming into sliding contact with a magnetic recording medium is provided adjacent a magnetic head core on an upstream side thereof, as determined by a running direction of the magnetic recording medium relative to the magnetic head core, and at least a portion of the sliding contact part, said portion coming into sliding contact with the magnetic recording medium, is made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material.
Claim 3
Dependent Claim
54 words
A recording/reproducing apparatus characterized in that at least a portion of a core-holding member, said portion coming into sliding contact with a magnetic recording material, is made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material, and a magnetic head is composed of the composite material.
Claim 4
Dependent Claim
54 words
A recording/reproducing apparatus characterized in that at least a portion of a core-holding member, said portion coming into sliding contact with a magnetic recording material, is made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material, and a magnetic head is composed of the composite material.
Claim 5
Dependent Claim
56 words
A recording/reproducing apparatus characterized in that a magnet and a magnet-holding member made of a non-magnetic substance are provided, at least a surface of the magnet holding member coming into sliding contact with a magnetic recording medium being made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material.
Claim 6
Dependent Claim
56 words
A recording/reproducing apparatus characterized in that a magnet and a magnet-holding member made of a non-magnetic substance are provided, at least a surface of the magnet holding member coming into sliding contact with a magnetic recording medium being made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material.
Claim 7
Dependent Claim
47 words
A recording/reproducing apparatus characterized in that at least a portion of a pad for a magnetic head, said portion coming into sliding contact with a magnetic recording medium, is made of a composite material comprising a carbonceous material of 50-95% by volume, and a mechanical strength-increasing material.
Claim 8
Dependent Claim
47 words
A recording/reproducing apparatus characterized in that at least a portion of a pad for a magnetic head, said portion coming into sliding contact with a magnetic recording medium, is made of a composite material comprising a carbonceous material of 50-95% by volume, and a mechanical strength-increasing material.
Claim 9
Dependent Claim
48 words
A recording/reproducing apparatus characterized in that at least a portion of a running guide member for a magnetic recording medium, said portion coming into sliding contact with the medium, is made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material.
Claim 10
Dependent Claim
48 words
A recording/reproducing apparatus characterized in that at least a portion of a running guide member for a magnetic recording medium, said portion coming into sliding contact with the medium, is made of a composite material comprising a carbonaceous material, of 50-95% by volume, and a mechanical strength-increasing material.
Claim 11
Dependent Claim
30 words
A recording/reproducing apparatus as claimed in claim 1, 2, 3, 4 or 5, wherein the composite material is composed of a carbonaceous material-containing porous sintered substrate impregnated with a metal.
Claim 12
Dependent Claim
31 words
A recording/reproducing apparatus as claimed in claim 1, 2, 3, 4 or 5, wherein the composite material is composed of a carbonaceous material-containing porous sintered substrate impregnated with a synthetic resin.
Claim 13
Dependent Claim
32 words
A recording/reproducing apparatus as claimed in claim 1, 2, 3, 4 or 5, wherein the composite material is composed of a carbonaceous material-containing porous sintered substrate impregnated with a non-metallic inorganic compound.
Claim 14
Dependent Claim
33 words
A recording/reproducing apparatus as claimed in claim 1, 2, 3, 4, or 5, wherein the composite material is produced by hot pressing a mixture of the carbonaceous material and the mechanical strength-increasing material.
Claim 15
Dependent Claim
61 words
A recording/reproducing apparatus as claimed in claim 1, 2, 3, 4 or 5, wherein the mechanical strength-increasing material is composed of a metallic binder and a metallic impregnating material having a melting point lower than that of the metallic binder, and the porous sintered body produced from the carbonaceous material and the metallic binder is impregnated with the metallic impregnating material.
References Cited (Backward Citations)
FR2219133A1
Cited
US4161005A
Cited
US4220884A
Cited
US4157409A
Cited
US4434202A
Cited
JPS5862864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |