Coordinates input apparatus with plural pulse train whose phases

Details Coordinates input apparatus with plural pulse train whose phases Coordinates input apparatus with plural pulse train whose phases

1989-07-10

1990-03-20

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 19, 367907, 367901, G08C 2100

Patent

active

049103636

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.

REFERENCES:
patent: 4665282 (1987-05-01), Sato et al.

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