Position transducer and position sensing method

Details Position transducer and position sensing method Position transducer and position sensing method

1996-01-22

1998-08-11

Saras, Steven

Telegraphy

Systems

Position coordinate determination for writing

178 19, 345174, 345179, G08C 2100, G09G 302

Patent

active

057929971

ABSTRACT:
A position transducer and a position sensing method which permit the sensing of a coordinate of a plurality of position indicators without changing resonance frequencies of the plurality of position indicators. The position transducer is made up of a first group of antennas arranged one after the other in one of two directions which cross each other at right angles within a two-dimensional plane; a second group of antennas arranged one after the other in the other direction which is at right angles to the one direction within the two-dimensional plane. The method includes selecting an antenna capable of transmitting a more intensive electromagnetic wave to a position indicator to be measured compared with an electromagnetic wave sent to the other position indicator(s); transmitting an electromagnetic wave to the position indicator to be measured from the selected antenna; and receiving a response electromagnetic wave while scanning the antennas by switching the first and second groups of antennas one after the other.

REFERENCES:
patent: 4832144 (1989-05-01), Murakami et al.
patent: 4878553 (1989-11-01), Yamanami et al.
patent: 5414226 (1995-05-01), Matsushima
patent: 5466896 (1995-11-01), Murakami et al.
patent: 5557076 (1996-09-01), Wieczorek et al.
U.S. Serial # 08/585,786, Filed Jan. 16, 1996 and Allowed Jul. 22, 1997.

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