Variable capacitor and position indicator employing variable cap

Details Variable capacitor and position indicator employing variable cap Variable capacitor and position indicator employing variable cap

1991-08-06

1993-04-27

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

73718, H01G 700, H01G 534

Patent

active

052067858

ABSTRACT:
A variable capacitor comprises a solid dielectric disc having one electrode disposed on one face thereof. A flexible electrode is selectively urged into contact with a second face of the disc, parallel to the first face. A translatable stem drives the second electrode into contact with the first surface. The variable capacitor is used in an implement which is moved relative to a position detecting tablet. The variable capacitor is part of a tuned circuit having a resonant frequency approximately the same as the frequency of AC energy applied to coils of the position detecting tablet.

REFERENCES:
patent: 3993939 (1976-11-01), Slavin et al.
patent: 4016466 (1977-04-01), Frappart
patent: 4092696 (1978-05-01), Boesen et al.
patent: 4736076 (1988-04-01), Mochizuki et al.
patent: 4786765 (1988-11-01), Yamanami et al.
patent: 4823230 (1989-04-01), Tiemann
patent: 4933807 (1990-06-01), Duncan
patent: 5028745 (1991-07-01), Yamanami et al.

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