Coordinates input apparatus

Details Coordinates input apparatus Coordinates input apparatus

1990-11-29

1992-03-17

Lall, Parshotam S.

Boots, shoes, and leggings

340706, 178 18, G08C 2100

Patent

active

050974157

ABSTRACT:
A coordinates input apparatus for detecting coordinates of an instructed position from a vibration progagation time on a vibration propagation plate is provided. This apparatus comprises; a vibration pen to generate a vibration; a vibration propagation plate with which the vibration pen is come into contact and which transmits the vibration; a sensor which is arranged in contact relation with the vibration propagation plate and detects the vibration; a vibration-proof material attached to the periphery of the vibration propagation plate so as to have a width of 1/2 of a wavelength of the elastic wave of the vibration; and an operation controller to calculate the contact position of the vibration pen on the vibration propagation plate from the detection time when the vibration was detected by the sensor. The sensor detects the surface wave of the vibration-proof material. With this apparatus, the coordinates of the instructed point can be accurately detected using the vibration with being hardly influenced by the reflected waves from the periphery of the plate.

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