US3663733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interconnecting device for movable contacts of keyboard switches
Assignee: Nippon Gakki Co Ltd
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Filing: 1970-07-22
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Granted: 1972-05-16
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Expires: 1990-07-22
Abstract
Abstract An interconnecting device for movable contacts of multistage keyboard switches in an electronic musical instrument in which a printed circuit board structure capable of interconnecting the movable contacts as groups in place of the conventional individual wirings is used. The device simplifies the complicated wiring operations in manufacture and also troublesome, complex connections in the movable contacts, resulting in elimination of cross-talking due to the existence of stray capacitances caused by unreliable connections.
Inventors
- 👤 Shin-Ichi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:09
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/32; G10B; G10B3/00; G10B3/10; H; H01; H01H; H01H1/00; H01H1/58; H01H1/5805; H01H2001/5816
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
350 words
In a musical instrument of the type having a circuit for electronically producing a plurality of musical tones, switching apparatus having a plurality of electrically conductive contacts movable between deactuated and actuated positions, said plurality of movable contacts being arranged in a selected number of sets each of said sets corresponding to a different musical tone, each of said movable contacts of a said set having movable actuating means operably interconnecting each of said movable contacts in a said set so that movement of a said actuating means of a said set will effect substantially simultaneous movement of each of said contacts of a said set between said deactuated and actuated positions, a plurality of stationary conducting members each positioned so as to be engaged by a said contact when a said contact is moved to its said actuated position to produce a musical tone, the improvement which comprises an electrically insulated oblong base plate having end portions spaced apart a predetermined distance, each end portion having at least one row of spaced perforations, each end portion having the same number of perforations, each one of said perforations in said row of one end portion being electrically connected on the surface of said base plate with one of said perforations in a said row of the other of said end portions of said plate, each of said perforations being coated thereon with a conductive material and said conductive material of each of said perforations in a said row of one end portion engaging at least one of said movable contacts of one of said sets and said conductive material of each of said perforations in a said row of the other of said end portions engaging at least one of said movable contacts of another of said sets, said one and said another of said sets having a predetermined number of sets extending therebetween, said base plate having a portion intermediate said end portions which is provided with passageways for receiving portions of the said sets of said movable contacts extending between said one and said another of said sets.
Claim 2
Dependent Claim
350 words
In a musical instrument of the type having a circuit for electronically producing a plurality of musical tones, switching apparatus having a plurality of electrically conductive contacts movable between deactuated and actuated positions, said plurality of movable contacts being arranged in a selected number of sets each of said sets corresponding to a different musical tone, each of said movable contacts of a said set having movable actuating means operably interconnecting each of said movable contacts in a said set so that movement of a said actuating means of a said set will effect substantially simultaneous movement of each of said contacts of a said set between said deactuated and actuated positions, a plurality of stationary conducting members each positioned so as to be engaged by a said contact when a said contact is moved to its said actuated position to produce a musical tone, the improvement which comprises an electrically insulated oblong base plate having end portions spaced apart a predetermined distance, each end portion having at least one row of spaced perforations, each end portion having the same number of perforations, each one of said perforations in said row of one end portion being electrically connected on the surface of said base plate with one of said perforations in a said row of the other of said end portions of said plate, each of said perforations being coated thereon with a conductive material and said conductive material of each of said perforations in a said row of one end portion engaging at least one of said movable contacts of one of said sets and said conductive material of each of said perforations in a said row of the other of said end portions engaging at least one of said movable contacts of another of said sets, said one and said another of said sets having a predetermined number of sets extending therebetween, said base plate having a portion intermediate said end portions which is provided with passageways for receiving portions of the said sets of said movable contacts extending between said one and said another of said sets.
Claim 3
Dependent Claim
66 words
The apparatus as claimed in claim 1 wherein each one of said perforations in a said row of one end portion of said base plate is electrically connected on the surface of said base plate with one of said perforations in a said row of the other of said end portions of said plate by means of a conductor printed on the surface of said plate.
Claim 4
Dependent Claim
19 words
The apparatus as claimed in claim 1 in which said electrically insulated base plate is made with Mylar film.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |