Samsung Electronics Co., Ltd.

Won-woo Choi

Seok-Weon Hong

Kwang-seok Kang

Cheol-jin Kim

A tray driving apparatus for a microwave oven and a microwave oven having the same including a speed changing unit for enhancing the cooking quality by periodically changing the rotational speed of the tray to more evenly radiate a microwave to food. The speed changing means includes a driving gear unit having a plurality of driving gears and mounted to the driving shaft; and a driven gear unit having a plurality of driven gears corresponding to respective driving gears of the driving gear unit, and mounted to the driven shaft. The gears of any one of the driving gear unit and the driven gear unit are portion gears which are gears having gear teeth on respective portions of outer peripheries thereof, the gear teeth of the portion gears are alternately disposed to each other one on another. Accordingly, upon a rotation of the driving shaft, each portion gear of any one of the driving gear unit and the driven gear unit are alternately meshed with a corresponding gear of the other one of the driving gear unit and the driven gear unit, to thereby change the rotational speed of the tray.

Tray driving apparatus for a microwave oven and a microwave oven having the same

In the microwave oven having a high voltage driving part with a high voltage transformer, a switching unit applies electric power to the high voltage driving part. In the switching unit, when switched on, an operational contact firstly comes in contact with a first contact coupled with a PTC thermistor and secondly with a second contact after a given time period, and a driving unit generates driving force and turns on/off the switching unit. Since the switching unit and driving unit may be simply installed to effectively eliminate the inrush current, assembly and work efficiencies are improved according to a simpler wiring process, and also, the total manufacturing cost for the microwave oven is reduced.

Apparatus for eliminating inrush current of a microwave oven

Tray driving apparatus for a microwave oven and a microwave oven having

A microwave oven has a cooking chamber in which a tray is provided for supporting food to be cooked. The tray is rotatable and can be raised and lowered. Cooking can be performed by microwaves and/or an electric resistance heater disposed in the cooking chamber. A sensor disposed in the cooking chamber detects a condition wherein food on the rising tray is at a height corresponding to that of the heater. In response to the sensing of such a condition the heater is turned off, a mechanism for raising the tray is also turned off, and a warning is emitted.

Apparatus for sensing whether food disposed on a raisable tray of a

A microwave oven includes a cooking chamber, a tray disposed in the cooking chamber upon which food can be placed, and a magnetron for supplying high frequency waves to the cooking chamber. The microwave oven has a food-thawing mode and a food-cooking mode. In the thawing mode, the oven is capable of bringing food to different states of thawing in response to the selection of a specific food-thawing key. In the food-cooking mode, various cooking levels can be selected.

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Suwon, South Korea

Won-woo Choi