US4592041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head for recording an information signal in and reproducing the same from a semiconductor recording medium
Assignee: Toshiba Corp
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Filing: 1983-11-15
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Granted: 1986-05-27
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Expires: 2003-11-15
Abstract
Abstract A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprises an electrode stylus for recording and reproducing recording information by relatively sliding on the semiconductor recording medium, the recording information being recorded and reproduced through the electrode stylus, and a nonconductive supporting substrate, provided on the side surface of the electrode stylus, for supporting the electrode stylus. A hardness of the electrode stylus is lower than a hardness of a surface medium which constitutes the semiconductor recording medium and is higher than a hardness of the supporting substrate.
Inventors
- 👤 Shigeo Senzaki
- 👤 Jun-ichiro Ikeuchi
- 👤 Toshikazu Matsui
- 👤 Norikazu Sawazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:29
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
92 words
A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprising: an electrode stylus having a lower hardness than that of a surface medium which constitutes said semiconductor recording medium, said electrode stylus relatively sliding on the semiconductor recording medium, and recording information being recorded and reproduced through said electrode stylus; and a nonconductive supporting substrate, provided on the side surface of said electrode stylus, for supporting the electrode stylus, a hardness of said supporting substrate being lower than the hardness of said electrode stylus.
Claim 2
Dependent Claim
92 words
A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprising: an electrode stylus having a lower hardness than that of a surface medium which constitutes said semiconductor recording medium, said electrode stylus relatively sliding on the semiconductor recording medium, and recording information being recorded and reproduced through said electrode stylus; and a nonconductive supporting substrate, provided on the side surface of said electrode stylus, for supporting the electrode stylus, a hardness of said supporting substrate being lower than the hardness of said electrode stylus.
Claim 3
Dependent Claim
51 words
A head according to claim 1, wherein said electrode stylus is formed of at least one member selected from the group consisting of tungsten W, molybdenum Mo, copper Cu, and alloy of copper; and said supporting substrate is formed of a member selected from the group consisting of glass and quartz.
Claim 4
Dependent Claim
55 words
A head according to claim 1, further comprising: a protective layer, formed on the other side surface of said electrode stylus, for protecting the electrode stylus, a hardness of said protective layer being equal to or lower than the hardness of the electrode stylus and being higher than the hardness of said electrode supporting substrate.
Claim 5
Dependent Claim
42 words
A head according to claim 3, wherein said protective layer is formed of at least one member selected from the group consisting of silicon oxide, aluminum oxide, beryllium oxide, tin oxide, titanium oxide, silicon nitride, titanium nitride, titanium carbide, and silicon carbide.
Claim 6
Dependent Claim
50 words
A head according to claim 3, wherein said protective layer is formed of at least one member selected from the group consisting of a metal oxide, metal nitride, and metal carbide, a film thickness of said protective layer being 1/5 to 1/2 of the film thickness of the electrode stylus.
Claim 7
Dependent Claim
15 words
A head according to claim 5, wherein said protective layer is formed of hard metal.
Claim 8
Dependent Claim
134 words
A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprising: an electrode stylus having a lower hardness than that of a surface medium which constitutes said semiconductor recording medium, said electrode stylus relatively sliding on said semiconductor recording medium, and recording information being recorded and reproduced through said electrode stylus; a supporting substrate, provided on the side surface of said electrode stylus, for supporting the electrode stylus, a hardness of said supporting substrate being lower than that of the electrode stylus; and at least one intermediate conductive layer, provided between said supporting substrate and said electrode stylus, for improving an adhesive property of the electrode stylus with the supporting substrate, a hardness of said intermediate conductive layer being lower than the hardness of said electrode stylus.
Claim 9
Dependent Claim
134 words
A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprising: an electrode stylus having a lower hardness than that of a surface medium which constitutes said semiconductor recording medium, said electrode stylus relatively sliding on said semiconductor recording medium, and recording information being recorded and reproduced through said electrode stylus; a supporting substrate, provided on the side surface of said electrode stylus, for supporting the electrode stylus, a hardness of said supporting substrate being lower than that of the electrode stylus; and at least one intermediate conductive layer, provided between said supporting substrate and said electrode stylus, for improving an adhesive property of the electrode stylus with the supporting substrate, a hardness of said intermediate conductive layer being lower than the hardness of said electrode stylus.
Claim 10
Dependent Claim
75 words
A head according to claim 7, wherein said electrode stylus is formed of at least one member selected from the group consisting of tungsten W, molybdenum Mo, copper Cu, and alloy of copper; said supporting substrate is formed of a member selected from the group consisting of glass and quartz; and said intermediate conductor layer is formed of at least one member selected from the group consisting of chromium, manganese, titanium, molybdenum, and nickel-chromium alloy.
Claim 11
Dependent Claim
19 words
A head according to claim 7, wherein a thickness of said intermediate conductive layer is 200 to 1000 Å.
Claim 12
Dependent Claim
55 words
A head according to claim 7, further comprising a protective layer, formed on the other side surface of said electrode stylus, for protecting the electrode stylus, a hardness of said protective layer being equal to or lower than the hardness of said electrode stylus and being higher than the hardness of said electrode supporting substrate.
Claim 13
Dependent Claim
42 words
A head according to claim 10, wherein said protective layer is formed of at least one member selected from the group consisting of silicon oxide, aluminum oxide, beryllium oxide, tin oxide, titanium oxide, silicon nitride, titanium nitride, titanium carbide, and silicon carbide.
Claim 14
Dependent Claim
50 words
A head according to claim 10, wherein said protective layer is formed of at least one member selected from the group consisting of a metal oxide, metal nitride, and metal carbide, a film thickness of said protective layer being 1/5 to 1/2 of the film thickness of the electrode stylus.
Claim 15
Dependent Claim
15 words
A head according to claim 12, wherein said protective layer is formed of hard metal.
Claim 16
Dependent Claim
170 words
A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprising: an electrode stylus having a lower hardness than that of a surface medium which constitutes said semiconductor recording medium, said electrode stylus relatively sliding on said semiconductor recording medium, and recording information being recorded and reproduced through said electrode stylus; a supporting substrate, provided on the side surface of said electrode stylus, for supporting the electrode stylus, a hardness of said supporting substrate being lower than the hardness of said electrode stylus; and an intermediate conductive layer which is provided between said supporting substrate and said electrode stylus and has a lower hardness than that of the electrode stylus, said intermediate conductive layer consisting of a first intermediate conductive layer having a good adhesive property with said supporting substrate, a second intermediate conductive layer having a good adhesive property with said electrode stylus, and a third intermediate conductive layer having a good adhesive property with said first and second intermediate conductive layers.
Claim 17
Dependent Claim
170 words
A head for recording an information signal in and reproducing the same from a semiconductor recording medium comprising: an electrode stylus having a lower hardness than that of a surface medium which constitutes said semiconductor recording medium, said electrode stylus relatively sliding on said semiconductor recording medium, and recording information being recorded and reproduced through said electrode stylus; a supporting substrate, provided on the side surface of said electrode stylus, for supporting the electrode stylus, a hardness of said supporting substrate being lower than the hardness of said electrode stylus; and an intermediate conductive layer which is provided between said supporting substrate and said electrode stylus and has a lower hardness than that of the electrode stylus, said intermediate conductive layer consisting of a first intermediate conductive layer having a good adhesive property with said supporting substrate, a second intermediate conductive layer having a good adhesive property with said electrode stylus, and a third intermediate conductive layer having a good adhesive property with said first and second intermediate conductive layers.
References Cited (Backward Citations)
US2892898A
Cited
GB1487260A
Cited
US4104832A
Cited
US4247120A
Cited
US4340953A
Cited
JPS5658147A
Cited
JPS56134333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |