Sharp Kabushiki Kaisha Corporation

Yoshikazu Kitaguchi

Yoshikazu Yamamoto

Junichi Takeuchi

Tatsuhiko Nakamura

Fuminori Kaneko

Tomohiro Kitaura

Yoshihiro Okamoto

Yasuhiko Kamii

Masato Nakatani

Hiroshi Minakawa

Mari Nishide

Noriko Izumi

Eiji Fukuda

A heat cooking device comprises a casing, a heating chamber, and an exhaust duct having an outlet provided on a rear edge side of an upper surface of the casing such that exhaust air from an inside of the casing is blown out forward. An upper outer wall surface of a rear surface plate of the casing is covered by the exhaust duct to form an exhaust passage between the casing and the exhaust duct. A guidance part is provided inside the exhaust passage, and guides the water infiltrating into the exhaust passage through the outlet of the exhaust duct, downward inside the exhaust passage.

Heat cooking device

A water level sensor () is provided in an auxiliary tank () whose bottom portion communicates to a bottom portion of a pot () for generating steam and which is opened to the atmosphere. When water in the pot () keeps boiling and the stop time of a pump () reaches a predetermined time (e.g., 60 sec.), the pump () is driven for a predetermined time (e.g., 6 sec.) to supply water to the pot (). This temporarily suppresses the boiling of water in the pot (), lowering a steam pressure in a space formed by an external circulation passage (), a heating chamber, and the pot (). The water level in the auxiliary tank () then returns to a normal one, making it possible to correctly detect the water level in the pot ().

Heating cooker

A heat-cooking apparatus includes blowing means () that blows cooling air to an opening () of a heating chamber () when a door () is opened after steam is supplied to the heating chamber () for preparatory operation before heat-cooking or for heat-cooking itself. More specifically, after steam is supplied to the heating chamber (), when the door () is opened, the blowing means () drives a conventionally existing cooling fan () to suck in cooling air from outside the apparatus, and deflects the cooling air toward the opening () of the heating chamber () with a decoration box () so that the cooling air is blown to the opening () so as to pass sideways substantially across it. Thus, the cooling air mixes with high-temperature steam that tends to overflow frontward as soon as the door () is opened, and thereby lowers the temperature of the steam. This surely prevents the user from being hurt, as by being burnt, with the overflowing steam. Thus, without use of special exhausting means, it is possible to open the door () while ensuring the safety of the user even immediately after a heating medium (for example, steam) is supplied to the heating chamber ().

Heat-cooking apparatus

A microwave oven with an invertor control power source produces a microwave by the use of the magnetron in relation to the high frequency power generated by the invertor control power source. The heat sensitive ferreit beads provided on the lead wire for transmitting the high frequency power to the magnetron changes the inductance of the wire from the high level to the low level at around a threshold temperature lower than the working equilibrium temperature of the magnetron. The cathode filament current remains within the allowable range, and the moding of the magnetron is prevented. The magnetron can operate in a long life time.

Microwave oven with inverter controlled power source

Growing community of inventors

Habikino, Japan

Yoshikazu Kitaguchi