US4351747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information signal record medium of the capacitance type
Assignee: Zeon Corp
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Filing: 1980-10-28
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Granted: 1982-09-28
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Expires: 2000-10-28
Abstract
Abstract An improvement is provided in and relating to a capacitance-type record medium wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area. The improvement consists in the fact that at least the surface area of the record medium is formed of (1) a material composed of an electrically conductive substance and a copolymer consisting of 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid in which the fatty acid residue has 4 to 18 carbon atoms and 0 to 15% by weight of another monomer copolymerizable with these compounds, or (2) a material composed of an electrically conductive substance and a polymer mixture consisting of at least two polymers in which the proportions of the constituent monomers are the same as in the aforesaid copolymer.
Inventors
- 👤 Kazumichi Miyamoto
- 👤 Akira Nishizawa
- 👤 Takao Okuda
- 👤 Mamoru Nakamura
- 👤 Takaharu Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:54
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/06; G11B9/061; G11B9/063; G11B9/068; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
158 words
In an information signal record medium of the capacitance type wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area, the improvement wherein at least the surface area of the record medium is formed of a material composed of an electrically conductive substance and a copolymer consisting of 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid in which the fatty acid residue has 4 to 18 carbon atoms and 0 to 15% by weight of another monomer copolymerizable with these compounds.
Claim 2
Dependent Claim
158 words
In an information signal record medium of the capacitance type wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area, the improvement wherein at least the surface area of the record medium is formed of a material composed of an electrically conductive substance and a copolymer consisting of 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid in which the fatty acid residue has 4 to 18 carbon atoms and 0 to 15% by weight of another monomer copolymerizable with these compounds.
Claim 3
Dependent Claim
34 words
The record medium of claim 1 wherein the alkyl vinyl ether is selected from the group consisting of n-butyl vinyl ether, iso-butyl vinyl ether, octyl vinyl ether, lauryl vinyl ether and cetyl vinyl ether.
Claim 4
Dependent Claim
32 words
The record medium of claim 1 wherein the vinyl ester of a fatty acid is selected from the group consisting of vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate and vinyl oleate.
Claim 5
Dependent Claim
56 words
The record medium of claim 1 wherein the other monomer is selected from the group consisting of olefins, vinyl esters of fatty acids having not more than 3 carbon atoms, unsaturated carboxylic acids, unsaturated carboxylic acid esters, unsaturated carboxylic acid anhydrides, nitrile compounds, alkyl vinyl ethers having not more than 3 carbon atoms and vinylidene compounds.
Claim 6
Dependent Claim
28 words
The record medium of claim 1 wherein the electrically conductive substance is selected from the group consisting of carbon black and fine powders of silver, copper and aluminum.
Claim 7
Dependent Claim
29 words
The record medium of claim 1 wherein the amount of the electrically conductive substance is 10 to 60 parts by weight per 100 parts by weight of the copolymer.
Claim 8
Dependent Claim
44 words
The record medium of claim 1 wherein the material composed of the electrically conductive substance and the copolymer has a melt viscosity of 3×10 3 to 30×10 3 at a temperature of 160° C. and a shearing speed of 10 3 sec -1 .
Claim 9
Dependent Claim
182 words
In an information signal record medium of the capacitance type wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area, the improvement wherein at least the surface area of the record medium is formed of a material composed of an electrically conductive substance and a polymer mixture of at least two polymers in which the proportions of the monomers constituting the polymer mixture are such that the mixture contains 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid with the fatty acid residue having 4 to 18 carbon atoms, and 0 to 15% by weight of another monomer copolymerized with at least one of these compounds.
Claim 10
Dependent Claim
182 words
In an information signal record medium of the capacitance type wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area, the improvement wherein at least the surface area of the record medium is formed of a material composed of an electrically conductive substance and a polymer mixture of at least two polymers in which the proportions of the monomers constituting the polymer mixture are such that the mixture contains 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid with the fatty acid residue having 4 to 18 carbon atoms, and 0 to 15% by weight of another monomer copolymerized with at least one of these compounds.
Claim 11
Dependent Claim
34 words
The record medium of claim 8 wherein the alkyl vinyl ether is selected from the group consisting of n-butyl vinyl ether, isobutyl vinyl ether, octyl vinyl ether, lauryl vinyl ether and cetyl vinyl ether.
Claim 12
Dependent Claim
32 words
The record medium of claim 8 wherein the vinyl ester of a fatty acid is selected from the group consisting of vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate and vinyl oleate.
Claim 13
Dependent Claim
56 words
The record medium of claim 8 wherein the other monomer is selected from the group consisting of olefins, vinyl esters of fatty acids having not more than 3 carbon atoms, unsaturated carboxylic acids, unsaturated carboxylic acid esters, unsaturated carboxylic acid anhydrides, nitrile compounds, alkyl vinyl ethers having not more than 3 carbon atoms and vinylidene compounds.
Claim 14
Dependent Claim
28 words
The record medium of claim 8 wherein the electrically conductive substance is selected from the group consisting of carbon black and fine powders of silver, copper and aluminum.
Claim 15
Dependent Claim
30 words
The record medium of claim 8 wherein the amount of the electrically conductive substance is 10 to 60 parts by weight per 100 parts by weight of the polymer mixture.
Claim 16
Dependent Claim
45 words
The record medium of claim 8 wherein the material composed of the polymer mixture and the electrically conductive substance has a melt viscosity of 3×10 3 to 30×10 3 at a temperature of 160° C. and a shearing speed of 10 3 sec -1 .
Claim 17
Dependent Claim
40 words
The record medium of claim 8 wherein the polymer mixture consists of a homopolymer or copolymer of vinyl chloride and a copolymer of an alkyl vinyl ether and/or a vinyl ester of a fatty acid and a monomer copolymerizable therewith.
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) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |