Cordless position detection apparatus

Details Cordless position detection apparatus Cordless position detection apparatus

1994-11-14

1996-09-17

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

055570763

ABSTRACT:
A cordless position detection apparatus includes a position detection area and a pointer. A plurality of conductors are arranged side-by-side in the position detection area. The position detection area has a selection circuit for selecting single conductors, and a transmitting circuit that provides a transmitting signal having at least one harmonic to a selected conductor. A pointer for use with the position detecting area includes a resonance circuit which is tuned to an harmonic of the transmitting signal. The pointer is excited by the transmitting signal to oscillate and radiates a receiving signal. A receiving circuit in the detection apparatus detects the receiving signal in a selected conductor and processing means uses this received signal to determine a position indicated by the pointer.

REFERENCES:
patent: 4848496 (1989-07-01), Murakami et al.
patent: 5045645 (1991-09-01), Hoendervoogt et al.
patent: 5220324 (1993-06-01), Morita
patent: 5235142 (1993-08-01), Lendmeier et al.
patent: 5373118 (1994-12-01), Watson
Patent Abstract of Japan, vol. 17, No. 474 (P-1602) Aug. 1993 re JP-A-5-113844.

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