Deformable touch sensitive surface

Details Deformable touch sensitive surface Deformable touch sensitive surface

1982-02-11

1985-09-17

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340365P, 340365VL, 34081331, 34081531, G09G 100

Patent

active

045423750

ABSTRACT:
A touch sensitive device is arranged with substantially parallel surfaces inside which light from a synchronized source, such as a CRT, can become trapped by total internal reflection. The screen is fitted with photodetectors which respond to the entrapment of light within the surfaces. The device is compliant so that a touch of the device at a particular point will cause an inward deflection of the surface at that point. The deflection causes light to become entrapped within the surface by total internal reflection thus making it possible, by comparing the photodetector output with the CRT raster position, to determine the exact surface position of the touch.

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patent: 4180702 (1979-12-01), Sick et al.
patent: 4198623 (1980-04-01), Misek et al.
patent: 4305071 (1981-12-01), Bell et al.

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