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Position detecting apparatus and method for detecting position pointing device
| Details |
Inventors: Katsurahira, Yuji; Sekizawa, Yasushi;
Assignee: Wacom Co., Ltd. (Saitama-ken, JP)
Primary Examiner: Saras; Steven J.
Assistant Examiner: Alphonse; Fritz
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
A position detecting apparatus capable of detecting position pointing devices of any combination simultaneously out of plural position pointing devices, thereby providing a user a friendly apparatus. A frequency of a resonance circuit provided inside a position pointing device is set by a command signal transmitted from a tablet, causing plural position pointing devices placed on the tablet to have a different frequencies, thereby suppressing electromagnetic interference among position pointing devices on the tablet, so that a simultaneous detection becomes available. |
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DETAILED DESCRIPTION The purpose of the present invention is to provide a position detecting apparatus wherein any combination of two or more position pointing devices are detected on the same tablet, provided those position pointing devices are operable on the tablet.
In order to cope with such a problem, the present invention configures a resonance circuit installed in a position pointing device capable of being set to at least one of two frequencies.
In order to set a frequency of the resonance circuit to one of the at least two frequencies, an instruction signal is transmitted from the tablet which is in turn received by the position pointing device for setting the resonance frequency.
This invention also configures the position pointing device wherein the resonance circuit installed inside the device, having a predetermined resonance frequency in the initial state, can be changed to another predetermined frequency by receiving an instruction signal with said predetermined frequency electromagnetic wave from the tablet.
The present invention also configures the position detecting apparatus wherein the tablet transmits an electromagnetic wave indicating a binary code with two kinds of transmission continuation duration, the position pointing device having plural sets of integration circuits and comparators detecting the duration of induced voltage generated in the resonance circuit in accordance with the threshold voltage value of the comparators and time constant of the integrated circuits, capable of converting the duration to a binary code enabling a change in the resonance frequency in the resonance circuit in accordance with the binary code.
Thus, even if plural position pointing devices with the same configuration are placed on a tablet, a binary code as an instruction signal to set a resonance circuit in each position pointing device with a different frequency is transmitted to each device, and in the position pointing device, the binary code is detected to switch the resonance frequency in accordance with the detected binary code
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