Coordinates input apparatus

Details Coordinates input apparatus Coordinates input apparatus

1990-09-05

1991-05-21

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340708, 178 18, G09G 302

Patent

active

050179136

ABSTRACT:
There is provided a coordinates input apparatus to decide input coordinates from the propagating times of the ultrasonic vibrations on a vibration propagating plate made of a transparent glass plate input tablet. This apparatus comprises: a vibration pen to generate a vibration; and input tablet to which the vibration pen touches and which propagates the vibration generated; vibration sensors, attached to the input tablet, for detecting the vibration generted by the vibration pen and propagated by the input tablet; a measuring device to respectively measure two periods of time from the vibration input by the contact with the input tablet by a vibration pen until the leading and trailing zero-cross timings of the peak wave among the vibration waves are detected by the vibration sensors; a calculating circuit for calculating the vibration propagating distances from the vibration input point on the input tablet to the vibration sensors on the basis of the two periods of time until the leading and trailing edges of the peak wave among a vibration waves measured by the measuring device and the vibrating velocity; and a controller to obtain the position coordinate values of the vibration input point on the input tablet by the vibration propagating distances from the vibration input point to the vibration sensors.

REFERENCES:
patent: 4055726 (1979-10-01), Turner et al.
patent: 4568799 (1986-02-01), Kobayashi et al.
patent: 4654648 (1987-03-01), Herrington et al.
patent: 4665282 (1987-05-01), Sato et al.
patent: 4717793 (1988-01-01), Kobayashi
patent: 4772764 (1988-09-01), Dorr
patent: 4791416 (1988-12-01), Adler
patent: 4931965 (1990-06-01), Kaneko et al.

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