Patent US3590134A successfully refreshed from Google Patents.
US3590134A
Expired / Lapsed
US
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Electronic musical system with magnetic field responsive switch and volume control
Assignee: Nippon Gakki Co Ltd
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Filing: 1969-03-24
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Granted: 1971-06-29
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Expires: 1989-03-24
Abstract
Abstract An electronic musical system has a DC power supply and a tone generator with a first resistance connected in series between them. A second resistance has one end connected to the series circuit between the power supply and the tone generator and the other end connected to ground. One of the resistances is a magnetoresistor the electric resistance of which varies in accordance with the intensity of the magnetic field applied thereto. A key is movably mounted above the magnetoresistor with a magnet element mounted thereon close to the magnetoresistor, so that movement of the key controls the electrical resistance of the magnetoresistor depending on the amount the key is moved, and thus controls the volume of the tone generator.
Inventors
- 👤 Mikio Ogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:58
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/055; G10H1/0555; H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0076; H03G5/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
An electronic musical system comprising a DC electric power source, a tone generator, a first resistance means connected in a series circuit between said power source and said tone generator, a second resistance means having one end connected to the series circuit between said first resistance and said tone generator and the other end connected to ground, at least one of said resistance means being a magnetoresistor the electrical resistance of which varies in accordance with the intensity of the magnetic field applied thereto, a key means movably supported in said system so as to be depressed when it is moved, and a magnet element mounted on said key means close to said magnetoresistor and movable therewith for controlling the electrical resistance of said magnetoresistor in accordance with the amount said key means is depressed.
Claim 2
Dependent Claim
135 words
An electronic musical system comprising a DC electric power source, a tone generator, a first resistance means connected in a series circuit between said power source and said tone generator, a second resistance means having one end connected to the series circuit between said first resistance and said tone generator and the other end connected to ground, at least one of said resistance means being a magnetoresistor the electrical resistance of which varies in accordance with the intensity of the magnetic field applied thereto, a key means movably supported in said system so as to be depressed when it is moved, and a magnet element mounted on said key means close to said magnetoresistor and movable therewith for controlling the electrical resistance of said magnetoresistor in accordance with the amount said key means is depressed.
Claim 3
Dependent Claim
26 words
An electronic musical system as claimed in claim 1 wherein said first resistance means is said magnetoresistor and said second resistance means is a fixed resistor.
Claim 4
Dependent Claim
26 words
An electronic musical system as claimed in claim 1 wherein said first resistance means is a fixed resistor and said second resistance means is said magnetoresistor.
Claim 5
Dependent Claim
62 words
An electronic musical system as claimed in claim 1 wherein both said first and second resistance means are magnetoresistors the electrical resistance of which varies in accordance with the intensity of magnetic field applied thereto, and said magnet element is positioned close to and controls both of said magnetoresistors so that the electrical resistance of said magnetoresistors varies oppositely from each other.
Claim 6
Dependent Claim
52 words
An electronic musical instrument as claimed in claim 1 wherein said magnet element is a magnet having two opposite poles spaced from each other, and said magnetoresistor faces one of said poles when said key means is not depressed and faces the other of said poles when said key means is depressed.
Claim 7
Dependent Claim
20 words
An electronic musical instrument as claimed in claim 5 wherein said two poles are positioned parallel in a horizontal direction.
Claim 8
Dependent Claim
20 words
An electronic musical instrument as claimed in claim 5 wherein said two poles are arranged on a collinear vertical line.
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |