Ultrasonic coordinates input device
First Claim
Patent Images
1. An ultrasonic coordinates input device comprising:
- a propagator for allowing ultrasonic wave to propagate therethrough;
input means for inputting ultrasonic waves to the propagator;
a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; and
arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups;
wherein each group of receivers includes at least three receivers which are substantially aligned.
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Abstract
The ultrasonic coordinates input device includes receivers grouped into a plurality of groups, each receiver receiving the ultrasonic waves propagated through a propagator so as to calculate the coordinates of the ultrasonic wave inputted positions on the basis of signals received by each group, thereby ensuring that the coordinates are calculated with a simple mathematical formulae with a negligible error if any.
231 Citations
25 Claims
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1. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; and arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; wherein each group of receivers includes at least three receivers which are substantially aligned. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24, 25)
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2. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; and arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; wherein the receivers are grouped into two groups, and the arithmetic means calculates the coordinates on one of the orthogonal coordinates axes on the basis of signals received by the receivers in one group, and calculates the coordinates on the other axis on the basis of signals received by the receivers in the other group. - View Dependent Claims (3, 4, 11)
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5. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; and arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; wherein each of the receivers receives a planar symmetrical wave which is fastest of the ultrasonic waves propagating through the propagator, and is additionally provided with a detecting means for effecting the full-wave rectification of the planar symmetrical waves so as to detect a rise of the first wave or an envelop component thereof, wherein the arithmetic means measures time differences in receiving the ultrasonic waves between the receivers in accordance with the results of detection obtained by the detecting means.
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6. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; and identifying means for identifying a shift of the ultrasonic wave input means in response to the reception of ultrasonic waves within a predetermined period of time, wherein the predetermined period of time is not shorter than the greatest of all the time differences between the receivers. - View Dependent Claims (22)
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7. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; and identifying means for identifying a shift of the input means in response to the reception of ultrasonic waves within a predetermined period of time, wherein the predetermined period of time is not shorter than the greatest of all the time differences between the receivers, and the identifying means ignores a predetermined number of signals received immediately after the receivers start to receive and identifies the shift of the input means on the basis of the signals subsequently received. - View Dependent Claims (23)
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8. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; and arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; wherein the arithmetic means ignores a predetermined number of signals received immediately after the receivers start to receive and calculates the coordinates of the ultrasonic wave inputted positions on the basis of the signals subsequently received.
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9. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; an amplifier for amplifying signals received by each of the receivers; and means for adjusting the amplification factor of the amplifier in accordance with the amplitudes of the signals received by each receiver.
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10. An ultrasonic coordinates input device comprising:
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a propagator for allowing ultrasonic wave to propagate therethrough; input means for inputting ultrasonic waves to the propagator; a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups; an amplifier for amplifying signals received by each of the receivers; and means for adjusting the amplification factor of the amplifier in accordance with the distances between the respective receivers and the ultrasonic wave inputted positions calculated on the basis of the coordinates already obtained.
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Specification