Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1991-06-17
1992-09-22
Walberg, Teresa J.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219449, H05B 374
Patent
active
051499444
ABSTRACT:
An electric cooking appliance includes a heater lamp such as a halogen lamp, a top plate on which a cooking pan is placed, the top plate being disposed over the heater lamp, a thermostat sensing an ambient temperature of the heater lamps, and a microcomputer serving to output an controlled output value command for controlling an output of the heater lamp and to control the output of the heater lamp so that the output of the heater lamp is gradually decreased based on the controlled output value command every time the temperature sensed by the thermostat takes a predetermined value or more. The microcomputer further serves to determine a degree of heat absorptivity of the cooking pan in accordance with the controlled output value command in the condition that the cooking pan is placed on the top plate, thereby determining whether or not the cooking pan is suitable for the cooking. The result of determination of the microcomputer is displayed on a display. The controlled output value command takes either a value obtained a predetermined period of time after initiation of energization of the heater lamp or a value obtained when the control of gradually decreasing the output of the heater lamp is interrupted for a predetermined period of time or more.
REFERENCES:
patent: 3330939 (1967-07-01), Jacobs
patent: 4639578 (1987-01-01), Payne
patent: 4700051 (1987-10-01), Goessler
patent: 4740664 (1988-04-01), Payne
Kabushiki Kaisha Toshiba
Shaw, Jr. Philip M.
Walberg Teresa J.
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