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US 4,366,357 AGranted
High frequency heating apparatus
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorSeiichi Satoh
Life of this patent
Estimating the term…
Abstract
A magnetron and a steam generator are alternately and periodically energized by a variable power controller, and the microwave and steam outputs are controlled in a correlative fashion by varying the ratio of the periods of energization of the magnetron and steam generator.
Claims3
A microwave heating apparatus comprising:
- a housing;
- a heating chamber disposed in said housing;
- a steam generator provided in said housing for supplying steam into said heating chamber;
- a microwave generator provided in said housing for radiating microwave energy into said heating chamber;
- a first electric heater disposed at an upper portion in said heating chamber for supplying electric heating energy thereinto;
- a second electric heater disposed at a lower portion in said heating chamber for supplying electric heating energy thereinto;
- control means provided in said housing for controlling the operations of said steam generator, said microwave generator and said first and second electric heaters in the following four modes (a), (b), (c) and (d) of operation:
- (a) a first mode wherein only said microwave generator is continuously operated,
- (b) a second mode wherein only said microwave generator is intermittently operated,
- (c) a third mode wherein only at least one of said first and second electric heaters are operated, and
- (d) a fourth mode wherein said microwave generator is repeatedly operated for intermittent periods of time and both said steam generator and said first heater are repeatedly operated for the remaining periods of time;
- and
- means for selecting one of said four modes of operation.
10 more elements
Dependencies are inferred from the claim text.