Position detecting apparatus and pointing device thereof

Details Position detecting apparatus and pointing device thereof Position detecting apparatus and pointing device thereof

1996-01-16

2000-02-01

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

342452, 178 19, 178 87, 345158, 345179, H01Q 302

Patent

active

06020849&

ABSTRACT:
A position detecting system capable of making communications with a plurality of pointing devices without changing resonance circuits of said pointing devices, and a pointing device suitable for the position detecting system. The position detecting system detects positions of at least two cordless pointing devices on a two-dimensional plane and is equipped with a command electromagnetic wave transmitting circuit to transmit a command to the pointing device. Included in the position detecting system are a first group of antennae X1 to X11 arranged successively in one of the directions orthogonal to each other within the two-dimensional plane 11, a second group of antennae Y1 to Y8 arranged successively in the other direction orthogonal to the one direction within the two-dimensional plane 11, a selection circuit for, from the first and second antenna groups, selecting an antenna which is more strongly coupled to the pointing device to be measured than to the other pointing device in transmitting an electromagnetic wave, and a transmission circuit for transmitting an electromagnetic wave from the selected antenna to the pointing device to be measured.

REFERENCES:
patent: 4999461 (1991-03-01), Murakami et al.
patent: 5028745 (1991-07-01), Yamanami et al.
patent: 5073781 (1991-12-01), Stickelbrocks
patent: 5386219 (1995-01-01), Greanias et al.
patent: 5398036 (1995-03-01), Nakase et al.
patent: 5552568 (1996-09-01), Onodaka et al.

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