Abstract: An apparatus and a method automatically cook food, for example, a hulled grain such as buckwheat, thereby conveniently providing the uniform and optimal cooking quality of the food to a user. The cooking apparatus includes a cooking cavity that contains food to be cooked and water therein, and a heating unit that heats the food and the water. The cooking apparatus further includes a control unit operated in such a way as to heat the food and the water at a preset initial output of the heating unit, first to reduce the output of the heating unit to a first reduced output and allow the heated high temperature water to be absorbed into the food after a first preset time has elapsed, and second, to reduce the output of the heating unit to a second reduced output and cook an inside of the food using the high temperature water absorbed into the food after the water has simmered.

Abstract: A magnetron for use in, for example, microwave ovens, includes a positive polar cylinder, a plurality of vanes, and large-diameter and small-diameter strip rings. The vanes constitute a positive polar section, along with the positive polar cylinder. The large-diameter and small-diameter strip rings are disposed on an upper portion and a lower portion of the vanes, respectively, to alternatively and electrically connect the vanes to one another. The inside and outside diameters of the large-diameter strip ring are in a range of 17.1 mm to 18.01 mm and 18.6 mm to 19.6 mm, respectively. The inside and outside diameters of the small-diameter strip ring are in a range of 13.4 mm to 14.4 mm and 14.9 mm to 15.9 mm, respectively. The height of the large-diameter and small-diameter strip rings is in a range of 1.50 mm to 1.60 mm. The distance between the large-diameter strip ring and the small-diameter strip ring is maintained in an error range of 2.20 mm.

Abstract: A magnetron for use in, for example, microwave ovens, includes a positive polar cylinder, a plurality of vanes, and large-diameter and small-diameter strip rings. The vanes constitute a positive polar section, along with the positive polar cylinder. The large-diameter and small-diameter strip rings are disposed on an upper portion and a lower portion of the vanes, respectively, to alternatively and electrically connect the vanes to one another. The inside and outside diameters of the large-diameter strip ring are in a range of 17.1 mm to 18.01 mm and 18.6 mm to 19.6 mm, respectively. The inside and outside diameters of the small-diameter strip ring are in a range of 13.4 mm to 14.4 mm and 14.9 mm to 15.9 mm, respectively. The height of the large-diameter and small-diameter strip rings is in a range of 1.50 mm to 1.60 mm. The distance between the large-diameter strip ring and the small-diameter strip ring is maintained in an error range of 2.20 mm.