Patent Number: 6,168,158

Title: Device for detecting playing pieces on a board

Abstract: The invention relates to a game device, comprising: a game board divided into discrete squares and pieces of differing type for placing on these squares, such as a chessboard and chess pieces, wherein the squares are ordered in a rectangular array comprising rows and columns of squares, which game device comprises detection means for detecting the possible presence and the type of a piece on each square, in addition to means for generating appropriate detection signals, which device comprises: resonance coils arranged in the playing pieces; a number of elongate transmit and receive coils arranged in the board which each extend below a row or column of squares such that a part of both a transmit and receive coil is situated under each square; means for successively selecting a transmit coil and a receive coil in scanning manner; an amplifier which in correspondingly scanning manner is connected with its output to the selected transmit coil and connected with its input to the selected receive coil such that when a playing piece is situated above both the selected transmit coil and the selected receive coil a resonance signal is generated; means for detecting the resonance signal and generating a corresponding position and type signal, wherein for each transmit and/or receive coil at least one winding serving for compensation is arranged on its closed end zone remote from the amplifier in either a transmit coil or a receive coil.

Inventors: Bulsink; Bernard Johan (Enschede, NL)

Assignee: DGT Projects B.V.

International Classification: A63F 3/02 (20060101); A63F 003/00 ()

Expiration Date: 01/02/2018