Electromagnetic touch sensor input system in a cathode ray tube

Details Electromagnetic touch sensor input system in a cathode ray tube Electromagnetic touch sensor input system in a cathode ray tube

1985-04-15

1988-09-13

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

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

178 18, G09G 100

Patent

active

047712767

ABSTRACT:
A cathode ray tube display device has conductive plates mounted adjacent the four sides of the CRT faceplate. These plates are positioned to sense electromagnetic noise radiation generated by the CRT. The plates are coupled to differential circuits so that normally the noise signals generated in the plates cancel. However when a finger or other object is placed at or near the CRT faceplate, the noise radiation field is disturbed, and the changed signals generated in the plates are sensed by the circuits to provide output signals indicative of the coordinate position of the object at the faceplate. The plates are preferably mounted in the front bezel of the display cabinet.

REFERENCES:
patent: 4110749 (1978-08-01), Janko et al.
patent: 4281323 (1981-07-01), Burnett et al.
patent: 4291303 (1981-09-01), Cutler
patent: 4386232 (1983-05-01), Slater
patent: 4476463 (1984-10-01), Ng et al.
patent: 4517559 (1985-05-01), Deitch et al.

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