Matsushita Electronics Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Hiroshi Ochiai

Masanori Yoshihara

Etsuo Saitou

Yasunobu Nakano

Hiroshi Kanno

Nagisa Kuwahara

Hideki Ohguri

Yoshimasa Suzuki

Kazuhiko Miyamoto

Shinichi Suzuki

Shinobu Yoshikawa

Kazuo Suzuki

Mitsuichi Hiraishi

It is an object to provide a magnetron for a small-sized microwave oven which takes safety standards and a noise into consideration, in a magnetronfor a microwave oven, a pair of choke coilsandare provided in a filter case, and a height Hof the internal surface of the filter caseis set to be 35 to 45 mm, an outside diameter dof an air-core type inductanceis set to be 5.5 to 7.5 mm and a sectional area S of a high frequency absorbing memberis set to be 5 to 16 mm. In the magnetronfor a microwave oven, an electrostatic capacity between capacitor terminalsA andB and the filter caseis increased to be 500 to 700 pF.

Magnetron for microwave oven

A magnetron that includes a choke coil which is connected at one end to a cathode terminal and at the other end to a capacitor to form an LC circuit. The choke coil is made up of a first core type inductor, a second core type inductor and an air-core inductor, connected to the cathode terminal, all of which are connected in series and where the first and second core type inductors are separated by a 1 mm to 6 mm gap. The first and second core type inductors have a bar like, high-frequency absorbing member located within their respective windings.

Magnetron

In a magnetron, when a radius of a flat portionof a pole pieceis Rp, a radius of the inner circumference of a large-diameter equalizing ringis Rs, Rp&#x2267;Rs, a radius of the outer circumference of a small-diameter equalizing ring is Rs, a radius of a circle inscribed in a leading edge of an anode vane is Ra, and a minimum length between the pole pieces in the axial direction is Lg, the values of Ra, Rs, Rs, and Lg are set such that the following Expressions 1 and 2 are established:1.85&#x2266;(1+2)/2&#x2266;1.96, and[Expression 1]2.84&#x2266;3.0[Expression 2]

Magnetron with a specific dimension reducing unnecessary radiation

In a magnetron apparatus and a manufacturing method of the present invention, the magnetron apparatus comprises an anode cylinder, and a plurality of plate-form anode segments radially arranged around a central axis of the anode cylinder inside the anode cylinder. The anode segments are pressed against an inner surface of the anode cylinder by a pin press-fit into the central portion of the anode cylinder, and a far-end-side end surface each of the anode segments is secured to the inner surface. A concave is provided in the central portion of an inner end surface where the anode segments come into contact with the pin.

Magnetron apparatus having a segmented anode edges and manufacturing method

A high voltage noise filter for use in magnetron devices comprises a coil of a conductive wire coated with an insulating layer and another coil of the conductive wire with a conductive layer formed on the insulating layer, the two coils connected to each other in series A joint portion of the two coils has a triple-layered structure wherein a high withstand voltage layer either of a semiconductive or insulative member is formed in the vicinity of an end portion of the conductive layer, as interposed between the outer peripheral surface of the insulating layer and the conductive layer.

High voltage noise filter and magnetron device using it

An LC filter member has at least one coil-shaped conductor wire, an insulating layer formed on the outer surface of the coil-shaped wire and a conductive layer formed on the outer surface of the insulating layer. One end of the coil-shaped conductor wire is substantially electrically connected to a cathode terminal, and the other end of the coil-shaped conductor wire is substantially electrically connected to a high frequency electric supply. The conductive layer is grounded.

Magnetron coiled feedthrough LC filter

A pair of core-insertion-type choke coil constituting the filter circuit are connected to cathode terminals, of a magnetron, and antenna-like electrode (15 or 16) are provided extending from respective cathode terminals 10, without having any terminating connection; thereby undesirable outside leakage of the microwave is considerably decreased.

Growing community of inventors

Tochigi, Japan

Hiroshi Ochiai