Position detecting system and position detecting device

Abstract

To reduce an area of undetectable positions of a position pointing unit in an electromagnetic coupling type position detection system. In a position detection device 100, a transmission selection part104, in the control of a control part 101, selects either of a plurality of concentrically arranged transmission coils 111 and 112 in dependence on the position of the position pointing unit 120, andoutputs a position detecting signal generated by a transmission signal generation part 102 to the selected transmission coil. The selected transmission coil transmits the position detecting signal tothe position pointing unit 120. A reception selection part 108 sequentially selects a plurality of sensor coils 113, which receive a position pointing signal from the position pointing unit 120 as adetection signal. The position pointing signal sequentially received by the sensor coils 113 is output via a reception amplifier 109 to a detection part 110, which detects the pointing position of theposition detection unit 120 according to the detection signals.

Description

technical field [0001] The present invention relates to a position detection device used as an input device such as a CAD (Computer Aided Design), a computer, a portable information terminal (PDA), etc., which detects the indicated position of a position indicator by electromagnetic coupling, and uses the position indicator and A position detection system of a position detection device. Background technique [0002] At present, as a CAD input device or a computer input device, etc., a position detection system using an electromagnetic coupling method is used to receive a transmission signal through electromagnetic coupling between a position indicator and a position detection device, and the position detection device detects the position. The position indicated by the position indicator described above. [0003] For example, as in the invention described in Patent Document 1, in the aspect in which the transmitting coil is arranged on the outer peripheral portion of the sen...

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Problems solved by technology

[0011] However, since there is no receiving sensor coil 1002, there is a problem that the area where the position of the position indicator cannot be detected, that is, the invalid area 1003 between the transmitting coil 1001 and the receiving coil 1002 becomes large.

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