Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1988-05-17
1990-04-03
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
340711, 341 24, H01J 2970, G09G 302
Patent
active
049143581
ABSTRACT:
An object placed on a transparent touch panel horizontally arranged on a CRT is detected as an undesired material if a touch state longer than a normal key-in input time is detected. Removal of the undesired material is requested by the CRT display or an audio unit so that repetitive malfunction is prevented. A second longer time may be set to call a service man.
REFERENCES:
patent: 4105902 (1978-08-01), Iwai et al.
patent: 4291303 (1981-09-01), Cutler et al.
Terry Costlow, "Touch-Sensitive Systems Gain Ground for Data Entry", Electronic Design, Jan. 26, 1984; pp. 53-54.
Blum Theodore M.
Hitachi , Ltd.
Issing G.
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