US3564105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument key assembly with pressure sensitive resistor
Assignee: Nippon Gakki Co Ltd
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Filing: 1969-06-25
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Granted: 1971-02-16
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Expires: 1989-06-25
Abstract
Abstract A key assembly involves a plurality of keying switches, each of which is provided with a stationary contact element and a movable contact element cooperable at their contact point. Said movable contact element has a weight block disposed at the free end thereof and is elastically bendable by an actuating member mounted on the bottom side of a key member. At the contact point of the stationary contact element is positioned a sensor whose electric resistance makes varying responses in accordance with the magnitude of pressure applied thereto.
Inventors
- 👤 Hiroshi Amano
- 👤 Seiji Nakada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:34
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/055; G10H1/0556
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A key assembly for an electronic musical instrument comprising a plurality of key members, a plurality of key switches arranged in correspondence to the respective key members, an actuating member disposed on each of said key members, a stationary contact element and a movable contact element cooperable at their contact point, and disposed in correspondence to each of said key members, a weight block disposed at the free end of said movable contact element, and a sensor positioned at the contact point of said stationary contact element, the electric resistance of the sensor making varying responses in accordance with the magnitude of pressure applied thereto, whereby the magnitude of a tone signal passing through said key switch is varied in accordance with the magnitude of the force with which the key member is depressed.
Claim 2
Dependent Claim
134 words
A key assembly for an electronic musical instrument comprising a plurality of key members, a plurality of key switches arranged in correspondence to the respective key members, an actuating member disposed on each of said key members, a stationary contact element and a movable contact element cooperable at their contact point, and disposed in correspondence to each of said key members, a weight block disposed at the free end of said movable contact element, and a sensor positioned at the contact point of said stationary contact element, the electric resistance of the sensor making varying responses in accordance with the magnitude of pressure applied thereto, whereby the magnitude of a tone signal passing through said key switch is varied in accordance with the magnitude of the force with which the key member is depressed.
Claim 3
Dependent Claim
29 words
The key assembly claimed in claim 1 in which each of said keying switches involves a plurality of movable and stationary contact elements, a weight block and a sensor.
Claim 4
Dependent Claim
33 words
The key assembly claimed in claim 2 in which a plurality of pairs of said movable and stationary contact elements are vertically arranged in a row and jointly operated by one actuating member.
References Cited (Backward Citations)
US2296125A
Cited
US3463867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |