Touch keyboard system for digital logic control

Details Touch keyboard system for digital logic control Touch keyboard system for digital logic control

1976-04-20

1977-07-12

Habecker, Thomas B.

Communications: electrical

Audible indication

Percussion-type sound producer

3071414, G08C 100

Patent

active

040357953

ABSTRACT:
A control system for a microwave oven includes a programmable digital logic control circuit which enables a user to program information into the digital logic control circuit. The digital logic control circuit of the present invention allows a user to program information into the control, relating to the amount of time the magnetron tube is to be energized. The control also allows the user to select the power level or duty factor at which the magnetron is energized from three different levels, thus providing a choice to the user as to whether the magnetron is to be operated in a defrost mode, a slow cook mode or a cook mode. The control of the present invention allows the oven to be operated in a single stage manner whereby the microwave oven is operated in the defrost, slow cook or cook modes for the amount of time programmed into the control by the user. Alternatively, the oven may be programmed in a two stage manner whereby the user determines the duration of the defrost portion and the duration of the cook portion in a combination defrost-hold-cook mode. The user may also program the oven so that it operates in a combination defrost-hold-slow cook mode. A time of day clock and a timer is also provided by the control of the present invention. The user programs information into the control by means of a touch plate which is sectioned off into a plurality of areas, each area representing certain information to be entered into the control. Information in the control such as the time of day, the time remaining in any of the microwave modes, the time remaining in the timer mode, or the information which has been entered by the user is displayed to provide a visual feedback to the user.

REFERENCES:
patent: 3886539 (1975-05-01), Gould
R. L. Donze, "Keyboard Encoder," IBM Tech. Bull., vol. 15, No. 4, pp. 1065, 1066, Sept. 1972.

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