Title: Touch responsive sensor in electronic keyboard musical instrument

Abstract: A touch responsive sensor for an electronic keyboard musical instrument of a variable capacitor type, which comprises a pair of electrodes spaced apart from each other, and an intermediate electrode interposed between the pair of electrodes and separated from each of the pair of electrodes by a dielectric. The intermediate electrode is movable from near one of the pair of electrodes toward the other of the pair of electrodes in accordance with the movement of each playing key of the electronic musical instrument. Thus, in the course of a key depressing movement, first and second touch responsive controlling signals are derived from, respectively, between the one of the pair of electrodes and the intermediate electrode and between the other of the pair of electrodes and the intermediate electrode in accordance with the variation of capacitance produced therebetween.

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Inventors: Nagai, Yohei (Hamamatsu, JA)
Wachi, Masatada (Hamamatsu, JA)

Application Number: 520225
Filing Date: 1974-11-01
Publication_date: 1976-03-16
Assignee: Nippon Gakki Seizo Kabushiki Kaisha (Hamamatsu, JA)
Primary Class(es): 84/689 84/720, 84/DIG7, 341/33, 361/288, 984/317, 984/DIG1
Other Classes:
US Patent Ref:

2270789	Jan, 1942	Smith	84/DIG.
2542611	Feb, 1951	Zuck	84/1.
2656755	Oct, 1953	Miessner	84/1.
2732625	Jan, 1956	Buisson	317/250.
2756286	Jul, 1956	Johnson et al.	317/250.
2873637	Feb, 1959	Herold	84/1.
3293640	Dec, 1966	Chalfin et al.	340/365.
3659163	Apr, 1972	Borisov et al.	317/249.
3671822	Jun, 1972	Leno	317/249.
3754495	Aug, 1973	Honegger	84/1.
3836909	Sep, 1974	Cockerell	340/365.

Other Refs:
Primary Examiner: Hix, L. T.
Assistant Examiner: Witkowski, Stanley J.
Attorney: Cushman, Darby & Cushman