Position detecting apparatus having a tablet and a position pointing device
First Claim
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1. A position detecting apparatus, comprising a position pointing device and a tablet;
- the position pointing device comprising;
a resonance circuit comprising at least a coil and a capacitor; and
an amplitude control circuit for adjustably limiting the maximum amplitude of a signal generated by the resonance circuit according to operation of the amplitude control circuit; and
the tablet comprising;
an electromagnetic transmission means for transmitting at least two kinds of energy as electromagnetic waves during one transmission;
an electromagnetic reception means for receiving an electromagnetic wave reflected from said resonance circuit in response to an electromagnetic wave from the electromagnetic transmission means; and
an operation information identification means for identifying an operation by comparing the electromagnetic waves received by the electromagnetic wave reception means as a result of the two kinds of energy in relation to the maximum amplitude.
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Abstract
A position detecting apparatus includes a position point device and a tablet. The position pointing device has a simple configuration as well as an easy way of adjusting a resonance frequency, without requiring a wide range of frequencies for inputting information. The position pointing device has a resonance circuit and an amplitude control circuit that limits a signal level generated in the resonance circuit. The tablet transmits an electromagnetic wave with at least two kinds of energy per transmission, thereby identifying operation of the position pointing device based on a comparison of signal levels received by the tablet.
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15 Claims
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1. A position detecting apparatus, comprising a position pointing device and a tablet;
the position pointing device comprising; a resonance circuit comprising at least a coil and a capacitor; and an amplitude control circuit for adjustably limiting the maximum amplitude of a signal generated by the resonance circuit according to operation of the amplitude control circuit; and the tablet comprising; an electromagnetic transmission means for transmitting at least two kinds of energy as electromagnetic waves during one transmission; an electromagnetic reception means for receiving an electromagnetic wave reflected from said resonance circuit in response to an electromagnetic wave from the electromagnetic transmission means; and an operation information identification means for identifying an operation by comparing the electromagnetic waves received by the electromagnetic wave reception means as a result of the two kinds of energy in relation to the maximum amplitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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