Key input means having a switching element made of a light emitt

Details Key input means having a switching element made of a light emitt Key input means having a switching element made of a light emitt

1976-09-27

1978-05-30

Caldwell,, Sr.

Communications: electrical

Audible indication

Percussion-type sound producer

200310, 307116, 357 74, G06F 302

Patent

active

040926400

ABSTRACT:
A light emitting diode has a metal casing connected to the cathode electrode thereof to protect the light emitting diode from the ambient conditions. Detector circuitry is provided for detecting touch operation by an operator to the metal casing of the light emitting diode. A driver is responsive to the output of the detector circuitry for enabling the light emitting diode when the touch operation is effected to the metal casing of the light emitting diode.

REFERENCES:
patent: 3581124 (1971-05-01), Flores et al.
patent: 3683370 (1972-08-01), Nagano et al.
patent: 3732389 (1973-05-01), Kaelin et al.
patent: 3737670 (1973-06-01), Larson
patent: 3772685 (1973-11-01), Masi
patent: 3879618 (1975-04-01), Larson
patent: 3971013 (1976-07-01), Challoner et al.

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