US4833031A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1987-03-19
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Granted: 1989-05-23
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Expires: 2007-03-19
Abstract
Abstract A magnetic recording medium is provided with a protective film made of a diamond like carbon film and an organic compound film on a ferromagnetic metal recording film; and it realizes excellent durability and small spacing loss or the like; and as a result high density magnetic recording is obtainable.
Inventors
- 👤 Hideo Kurokawa
- 👤 Tsutomu Mitani
- 👤 Masaru Odagiri
- 👤 Taketoshi Yonezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:53
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/72; G11B5/726; G11B5/7262; G11B5/7264; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
102 words
A magnetic recording medium, comprising: a substrate of non-magnetic material; a recording film having a chemical affinity for carbon and a specific resistance less than 10 13 Ω.cm and formed on said substrate; and a protective film provided on the recording film and including (a) an amorphous carbon film of amorphous carbon having diamond bonds or amorphous carbon having both graphite and diamond bonds, and (b) an organic film formed on said amorphous carbon film and made of an organic compound having at least one fatty alkyl group having at least 8 carbon atoms at the end of a molecular structure thereof.
Claim 2
Dependent Claim
102 words
A magnetic recording medium, comprising: a substrate of non-magnetic material; a recording film having a chemical affinity for carbon and a specific resistance less than 10 13 Ω.cm and formed on said substrate; and a protective film provided on the recording film and including (a) an amorphous carbon film of amorphous carbon having diamond bonds or amorphous carbon having both graphite and diamond bonds, and (b) an organic film formed on said amorphous carbon film and made of an organic compound having at least one fatty alkyl group having at least 8 carbon atoms at the end of a molecular structure thereof.
Claim 3
Dependent Claim
15 words
A magnetic recording medium in accordance with claim 1, wherein said protective film contains hydrogen.
Claim 4
Dependent Claim
57 words
Amagnetic recording medium in accordance with claim 1, wherein said organic compound film is made of organic compound having at least one fatty alkyl group comprising besides said at least 8 carbon atoms, at least one fluoroalkyl group having at least 3 carbon atoms and at least one carboxyl group at the end of said molecular structure.
Claim 5
Dependent Claim
58 words
A magnetic recording medium in accordance with claim 1, wherein said organic compound film is made of organic compound having at least one fatty alkyl group comprising besides said at least 8 carbon atoms, and at least one fluoroalkyl group having at least 3 carbon atoms at least one mercapto group at the end of said molecular structure.
Claim 6
Dependent Claim
44 words
A magnetic recording medium in accordance with claim 1, wherein said organic compound film is made of organic besides said at least 8 carbon atoms and at least one fluoroalkyl group having at least 3 carbon atoms at the end of said molecular structure.
Claim 7
Dependent Claim
56 words
A magnetic recording medium in accordance with claim 1, wherein said organic compound film is made of organic compound having at least one fatty alkly group comprising besides said at least 8 carbon atoms and at least one selected from the group consisting of carboxyl group and mercapto group at the end of said molecular structure.
Claim 8
Dependent Claim
17 words
A magnetic recording medium in accordance with claim 1, wherein said amorphous carbon film has 30-500Å thickness.
Claim 9
Dependent Claim
29 words
A magnetic recording medium in accordance with claim 1, wherein said organic compuond film is formed by applying said organic compound in an amount of 0.1-500 mg/m 2 .
Claim 10
Dependent Claim
38 words
A magnetic recording medium in accordance with claim 1, wherein said recording film is made of ferromagnetic metal having a columnar crystal structure, and a metal oxide layer is provided on a surface of said columnar crystal particles.
Claim 11
Dependent Claim
23 words
A magnetic recording medium in accordance with claim 9, wherein said columnar crystal structure comprises a multilayered structure of said columnar crystal particles.
Claim 12
Dependent Claim
44 words
A magnetic recording medium in accordance with claim 1, wherein said recording film is made of a ferromagnetic metal having columnar crystal particles surrounded by an oxide layer coating and a shield film is provided between said recording film and said amorphous carbon film.
Claim 13
Dependent Claim
33 words
A magnetic recording medium in accordance with claim 11, wherein said shield film is made of at least one member selected from the group consisting of carbon, oxygen, hydrogen, fluorine and combinations thereof.
Claim 14
Dependent Claim
20 words
A magnetic recording medium in accordance with claim 11, wherein a thickness of said shield film is 50Å or below.
Claim 15
Dependent Claim
17 words
A magnetic recording film according to claim 11, wherein said shield film comprises a fluorine-containing organic compound.
Claim 16
Dependent Claim
29 words
A magnetic recording film according to claim 14, wherein said shield film comprises a compound represented by the formula C X F Y , wherein y/x =1.2 to 1.8.
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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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |