Coordinates input apparatus with plural pulse train whose phases differ
First Claim
1. A coordinates input apparatus comprising:
- vibrator drive control means for outputting a vibrator drive signal which is obtained by synthesizing a plurality of pulse trains whose phases differ;
vibration generating means for generating a vibration by a vibrator which generates the vibration in response to the vibrator drive signal output from said vibrator drive control means;
a vibration propagating member for propagating the vibration generated by said vibration generating means;
a plurality of vibration detecting means, attached to said vibration propagating member at a plurality of positions, for detecting the vibration generated by the vibration generating means at a plurality of positions; and
coordinate value calculating means for calculating the propagating times from the vibrations detected at said plurality of positions by said plurality of vibration detecting means, thereby obtaining coordinate values on the vibration propagating member on which the vibration generating means is located from the propagating times calculated.
0 Assignments
0 Petitions
Accused Products
Abstract
There is provided a coordinates input apparatus comprising: a vibrator drive controller to output a vibrator drive signal obtained by synthesizing a plurality of pulse trains whose phases differ; a vibration pen to generate a vibration from a vibrator which generates the vibration in response to the vibration drive signal output from the vibrator drive controller; a vibration propagating plate made of a transparent acrylic or glass plate to propagate the vibration generated by the vibration pen; a plurality of vibration sensors, attached to the vibration propagating plate, for detecting the vibration generated by the vibration pen at a plurality of positions; and a coordinate value calculation/control circuit for calculating the vibration propagating times from the vibrations detected by the vibration sensors at a plurality of positions, thereby obtaining the coordinate values on the vibration propagating plate on which the vibration pen is located from the propagating times calculated. With this apparatus, the influences of noise such as reflected waves on the vibration propagating plate can be eliminated, so that the vibration detecting point or a special point on the waveform can be accurately set.
39 Citations
15 Claims
-
1. A coordinates input apparatus comprising:
-
vibrator drive control means for outputting a vibrator drive signal which is obtained by synthesizing a plurality of pulse trains whose phases differ; vibration generating means for generating a vibration by a vibrator which generates the vibration in response to the vibrator drive signal output from said vibrator drive control means; a vibration propagating member for propagating the vibration generated by said vibration generating means; a plurality of vibration detecting means, attached to said vibration propagating member at a plurality of positions, for detecting the vibration generated by the vibration generating means at a plurality of positions; and coordinate value calculating means for calculating the propagating times from the vibrations detected at said plurality of positions by said plurality of vibration detecting means, thereby obtaining coordinate values on the vibration propagating member on which the vibration generating means is located from the propagating times calculated. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A coordinates input apparatus comprising:
-
vibrator drive signal generating means for generating a vibrator drive signal obtained by synthesizing a plurality of pulse trains whose phases differ; vibration generating means for generating a vibration by a vibrator in response to the vibrator drive signal generated by said vibrator drive signal generating means; a vibration propagating member for propagating the vibration generated by said vibration generating means; at least one vibration detecting means attached to said vibration propagating member for detecting the vibration generated by said vibration generating means; and coordinates value calculating means for calculating the propagating time from the vibration detected by said vibration detecting means, thereby obtaining coordinates values of said vibration generating means on said vibration propagating member from the calculated propagating time. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A coordinates input apparatus comprising:
-
vibrator drive signal generating means for generating a vibrator drive signal obtained by synthesizing a plurality of pulse trains whose phases differ; vibration generating means for generating a vibration by a vibrator in response to the vibrator drive signal generated by said vibrator drive signal generating means; a plurality of vibration detection means for detecting the vibration generated by said vibration generating means at their respective positions; coordinates value calculating means for calculating the propagating time from the vibration detected by said plurality of vibration detection means at the plurality of positions, thereby obtaining coordinates values of said vibration generating means from the calculated propagating time. - View Dependent Claims (14, 15)
-
Specification