Light-emitting device mounted under keybuttons of a keyboard

Details Light-emitting device mounted under keybuttons of a keyboard Light-emitting device mounted under keybuttons of a keyboard

1982-11-05

1985-01-01

Schreyer, Stafford D.

Electricity: circuit makers and breakers

Multiple circuit control

Pivoted contact

179 81C, 200314, 340365R, 362 24, H04M 122

Patent

active

044916922

ABSTRACT:
The present invention relates to a light-emitting device mounted under the keys of a keyboard, particularly to a device which emits light by using the effect of light-emitting diodes which are mounted below every key of a keyboard. When a user picks up the handset of a telephone or when the switch of a device is turned on, a closed circuit which emits light is formed so that the user can clearly see the symbols on the keys with the help of the light emitted by the light-emitting diodes. When the handset is placed on the telephone set, the power supply is cut off. Thus, the object of being able to telephone in darkness without difficulty is accomplished.

REFERENCES:
patent: 4056701 (1977-11-01), Weber
patent: 4131777 (1978-12-01), Bailey et al.

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