Coordinate reading system for detecting operation states of nume

Details Coordinate reading system for detecting operation states of nume Coordinate reading system for detecting operation states of nume

1992-12-22

1994-07-12

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

178 18, 340706, 345156, G06K 1100

Patent

active

053291662

ABSTRACT:
The object of the present invention is to enable detecting operation states of numerous switches in a cordless coordinate reading system. The coordinate reading system body is provided with the switching circuit for selecting the excitation signal, so that one of the groups of sense lines can be excited with a plurality of frequencies. The coordinate indicator is provided with the resonant circuit and the groups of devices for setting frequency which modify the resonance frequency of the resonant circuit in accordance with the press of the switch, enable the resonant circuit to resonate with any one of a plurality of the resonance frequencies, and further slightly modify the resonance frequency. Further, the coordinate reading system body is provided with the circuit for detecting the phase contrast between the induced signal from the coordinate indicator and the excitation signal. Thereby, it is possible to detect the switch which is pressed down among the numerous switch from the excitation frequencies and the phase contrast data.

REFERENCES:
patent: 4672154 (1987-06-01), Rodgers et al.
patent: 4886943 (1989-12-01), Suzuki et al.
patent: 4916740 (1990-04-01), Noda et al.
patent: 5023408 (1991-06-01), Mrakami et al.
patent: 5128174 (1991-06-01), Grat et al.
patent: 5162782 (1992-11-01), Yoshioka
patent: 5220324 (1993-06-01), Morita

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