US4152487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record member
Assignee: NEC Corp
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Filing: 1977-12-15
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Granted: 1979-05-01
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Expires: 1997-12-15
Abstract
Abstract A magnetic record member for use in magnetic recording devices is disclosed. The record member comprises a non-magnetic alloy disk polished to a mirror surface, a non-magnetic alloy layer formed on the disk, a magnetic thin film medium formed on the surface of the alloy layer, and a protective polysilicate film layer formed on the alloy layer. In certain embodiments, an oriented lubricant layer is formed on the polysilicate film layer.
Inventors
- 👤 Masahiro Yanagisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:02
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; G11B5/7253; G11B5/726; G11B5/7262; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12556; Y10T428/12611; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
72 words
A magnetic record member for a magnetic disc or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; and a protective polysilicate layer coated on said magnetic thin film medium, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane, said polysilicate layer containing a stress relaxation agent.
Claim 2
Dependent Claim
72 words
A magnetic record member for a magnetic disc or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; and a protective polysilicate layer coated on said magnetic thin film medium, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane, said polysilicate layer containing a stress relaxation agent.
Claim 3
Dependent Claim
19 words
A magnetic record member as claimed in claim 1 wherein said stress relaxation agent comprises a silane coupling agent.
Claim 4
Dependent Claim
19 words
A magnetic record member as claimed in claim 1 wherein said stress relaxation agent comprises a surface coupling agent.
Claim 5
Dependent Claim
41 words
A magnetic record member as claimed in claim 1 wherein said stress relaxation agent comprises at least one organic polymer having a function group reactive with either a polysilicate, a metal oxide, a silane coupling agent, or a surface coupling agent.
Claim 6
Dependent Claim
29 words
A magnetic record member as claimed in claim 1, wherein said stress relaxation agent comprises at least one organic polymer having a functional group reactive with said polysilicate layer.
Claim 7
Dependent Claim
50 words
A magnetic record member as claimed in claim 5, wherein said functional group is chosen from the group consisting of --COOH, --NH 2 , --SH, --COOR, --NHR, >NH, --CHO, --NCO, Si--OH, Si--OR, Si--X, ##STR14## --CH 2 OH, ##STR15## --OCOR, --OH, wherein R represents an alkyl group and X represents halogen.
Claim 8
Dependent Claim
18 words
A magnetic record member as claimed in claim 1 wherein said stress relaxation agent comprises a metal oxide.
Claim 9
Dependent Claim
60 words
A magnetic record member as claimed in claim 7, wherein said metal oxide is chosen from the group consisting of BaO, SrO, LiO, Na 2 O, K 2 O, Rb 2 O, Cs 2 O, MgO, CaO, ZnO, PbO, Al 2 O 3 , GaO, MnO, FeO, BeO, F 2 O 3 , CdO and Tl 2 O 3 .
Claim 10
Dependent Claim
74 words
A magnetic record member for a magnetic disc or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of the said disc; a protective polysilicate layer coated on said magnetic thin film medium, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane, said polysilicate layer containing a hydrolysis polymer of metal alkoxide.
Claim 11
Dependent Claim
74 words
A magnetic record member for a magnetic disc or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of the said disc; a protective polysilicate layer coated on said magnetic thin film medium, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane, said polysilicate layer containing a hydrolysis polymer of metal alkoxide.
Claim 12
Dependent Claim
54 words
A magnetic record member as claimed in claim 9, wherein the metal of said metal alkoxide is chosen from the group consisting of: Ti, V, Zr, Al, Sn, Zn, Be, Ce, Co, Cr, Cu, Dy, Eu, Fe, Ga, Hf, In, Mg, Mn, Mo, Nb, Ni, Pb, Rh, Sb, Th, Tl, Ta, V, and W.
Claim 13
Dependent Claim
78 words
A magnetic record member for a magnetic disc or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; a protective polysilicate layer coated on said magnetic thin film medium, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane, said polysilicate layer containing a stress relaxation agent and a hydrolysis polymer of metal alkoxide.
Claim 14
Dependent Claim
78 words
A magnetic record member for a magnetic disc or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; a protective polysilicate layer coated on said magnetic thin film medium, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane, said polysilicate layer containing a stress relaxation agent and a hydrolysis polymer of metal alkoxide.
Claim 15
Dependent Claim
54 words
A magnetic record member as claimed in claim 11, wherein the metal of said metal alkoxide is chosen from the group consisting of: Ti, V, Zr, Al, Sn, Zn, Be, Ce, Co, Cr, Cu, Dy, Eu, Fe, Ga, Hf, In, Mg, Mn, Mo, Nb, Ni, Pb, Rh, Sb, Th, Tl, Ta, V, and W.
Claim 16
Dependent Claim
64 words
A magnetic record member as claimed in claim 11, wherein said stress relaxation agent comprises a metal oxide chosen from the group consisting of: BaO, SrO, LiO, Na 2 O, K 2 O, Rb 2 O, Cs 2 O, MgO, CaO, ZnO, PbO, Al 2 O 3 , GaO, MnO, FeO, BeO, F 2 O 3 , CdO and Tl 2 O 3 .
Claim 17
Dependent Claim
19 words
A magnetic record member as claimed in claim 11, wherein said stress relaxation agent comprises a silane coupling agent.
Claim 18
Dependent Claim
19 words
A magnetic record member as comprised in claim 11, wherein said stress relaxation agent comprises a surface coupling agent.
Claim 19
Dependent Claim
37 words
A magnetic record member as claimed in claim 11, wherein said stress relaxation agent comprises at least one organic polymer, having a functional group reactive with either said polysilicate layer or said hydrolysis polymer of metal alkoxide.
Claim 20
Dependent Claim
50 words
A magnetic record member as claimed in claim 16, wherein said functional group is chosen from the group consisting of: --COOH, --NH 2 , --SH, --COOR, --NHR, >NH, --CHO, --NCO, Si--OH, Si--OR, Si--X, ##STR16## --CH 2 OH, ##STR17## --OCOR, --OH, where R represents the alkyl group and X represent halogen.
Claim 21
Dependent Claim
41 words
A magnetic record member as claimed in claim 11, wherein said stress relaxation agent comprises at least one organic polymer having a functional group reactive with either a polysilicate, a metal oxide, a silane coupling agent, or a surface coupling agent.
Claim 22
Dependent Claim
17 words
A magnetic record member as claimed in claim 18 wherein said silane coupling agent is a polyaminosilane.
Claim 23
Dependent Claim
67 words
A magnetic record member for a magnetic disco or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; a highly adhesive layer coated on said magnetic thin film medium; a polysilicate protective layer, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane.
Claim 24
Dependent Claim
67 words
A magnetic record member for a magnetic disco or drum comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; a highly adhesive layer coated on said magnetic thin film medium; a polysilicate protective layer, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane.
Claim 25
Dependent Claim
19 words
A magnetic record member as claimed in claim 20, wherein said highly adhesive layer comprises a silane coupling agent.
Claim 26
Dependent Claim
19 words
A magnetic record member as claimed in claim 20, wherein said highly adhesive layer comprises a methacrylate chromic chloride.
Claim 27
Dependent Claim
74 words
A magnetic record member comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; a highly adhesive layer coated on said magnetic thin film medium; a protective polysilicate film coated on said adhesive layer, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane; an oriented lubricant coated on said polysilicate film.
Claim 28
Dependent Claim
74 words
A magnetic record member comprising: a non-magnetic alloy disc substrate having a surface which is polished to a mirror finish; a magnetic metal thin film medium coated on said surface of said disc; a highly adhesive layer coated on said magnetic thin film medium; a protective polysilicate film coated on said adhesive layer, wherein said polysilicate is the dehydration condensation polymerization product of tetraalkoxysilane or tetrahydroxysilane; an oriented lubricant coated on said polysilicate film.
Claim 29
Dependent Claim
29 words
A magnetic record member as claimed in claim 23, wherein said oriented lubricant is a combination of at least two members of the group of alkoxysilane, chlorosilane and silazane.
Claim 30
Dependent Claim
35 words
A magnetic record member in accordance with claim 23, wherein said oriented lubricant is a combination of at least two members of the group of oriented dimethylsilcone oil, methylphenylsilicone oil, fluorosilicone oil and fluoro oil.
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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |