Hitachi, Ltd.

Other

Hitachi Device Engineering Co., Ltd.

Hitachi Electronic Devices Co., Ltd.

Tomokatsu Oguro

Mamoru Tsuzurahara

Toshio Ogura

Masumi Kuga

Noboru Baba

Masami Taguchi

Yoshio Ishida

Takahiro Daikoku

Kazutaka Okamoto

Akio Yasukawa

Masao Sakai

Seiji Kitakaze

Tatsuji Sakamoto

Ichiro Inamura

Hironobu Yamada

Satoshi Kobayashi

Hidetsuyo Baba

Yuichi Ito

Hiroshi Hisada

Masami Sato

Toru Moriike

Iwao Umeki

In a microwave irradiation apparatus, an applicator portion has an interior space for housing an object to be irradiated. A first microwave irradiation system outputs a first microwave to the interior space in a first mode so as to generate a large electric field and a small magnetic field at a specific place of the interior space. A second microwave irradiation system outputs a second microwave having a polarization plane crossing a polarization plane of the first microwave to the interior space in a second mode so as to generate a large magnetic field and small electric field at the specific place of the interior space.

Microwave irradiation apparatus

A microwave irradiation system includes first and second microwave generators, and an applicator which includes: a microwave transmission part connected to the first and second microwave generators; a reflecting plane, at an other end of the microwave transmission part of the applicator, configured to reflect microwaves from the first and the second microwave generators at such a location that a space of an object, in the microwave transmission part of the applicator between the end and the other end is irradiated with both a greater intensity of electric field and a smaller intensity of magnetic field generated by the first microwave generator and with both a greater intensity of magnetic field and a smaller intensity of electric field generated by the second microwave generator; and a filter part through which at least one of the first and second microwave generators is connected to the applicator.

Microwave irradiation system

A magnetron has an anode cylinder, a plurality of vanes extending radially inwardly from the anode cylinder, a cathode filament extending along a center axis of the anode cylinder, an output section including an antenna coupled to one of the vanes, and a magnetic circuit section for supplying a magnetic field into the anode cylinder, whereby the magnetron oscillates at a fundamental frequency in a range from 400 MHz to 600 MHz.

Magnetron having a lowered oscillation frequency and processing equipment employing the same

A magnetron having eight anode vanes (2) arranged radially inside an anode cylinder (3) and a helically coiled, directly heated filament positioned along the anode cylinder. The magnetron oscillates at a basic frequency of 2450 MHz. The external diameter of the helically coiled, directly heated filament is in the range of 2.6 to 3.2 mm, and the diameter between the internal ends of the anode vanes is in the range of 7.0 to 8.0 mm.

Magnetron with improved mode separation

A magnetron having an anode cylinder, cooling fins fixed thereto, permanent magnets vertically superposed on the anode cylinder and a yoke, serving as a magnetic path, for surrounding these components. The cooling fins extend on the windward direction to facilitate a discharge of the air in the orthogonal direction to the air blowing direction by an arrangement such that an outer width of the fins and a width of the yoke or the former is equalized to a diameter of the anode cylinder. Also included are a dielectric heater having a heating space for accommodating materials for heating and a space for accommodating the magnetron, an inverter power supply and a cooling air blower. The cooling air is discharged to the heating space and/or to the outside via a vent hole formed in a partition wall after impinging on the anode cylinder while cooling the fins.

Magnetron and dielectric heater using magnetron

The invention relates to a structure of an anode of a magnetron and to a method of manufacturing the same. This structure has a cylindrical outer frame portion and a plurality of vanes which are integrally formed with the outer frame portion and which radially extend from the inside of the outer frame portion in the central direction of the cylindrical outer frame portion. Projecting portions of predetermined shapes are formed on the inner wall of the outer frame portion or on the vanes so as to be integrated with the outer frame portion or vanes.

Structure of anode of magnetron and a method of manufacturing the same

A cathode structure of a magnetron which is used for microwave ovens, industrial microwave heating, and medical purposes is disclosed. One of two leads of the cathode structure of the magnetron, that is, one of a center lead and a side lead is tightly fitted into the spacer, and a metal fixing material is poured into the fitting portion and is fixed thereto. A hole of the spacer for inserting the other of the two leads has looseness with respect to the other of the two leads. The friction between the other of the two leads and the spacer is reduced, and even when the leads are made thin, the strength of the cathode structure is not reduced, and the production of extraneous sounds can be suppressed.

Magnetron cathode structure

The invention relates to a structure for an anode of a magnetron and to a method for manufacturing the same. This structure has a cylindrical outer frame portion and a plurality of vanes which are integrally formed with the outer frame portion and which radially extend from the inside of the outer frame portion in the central direction of the cylindrical outer frame portion. Projecting portions of predetermined shapes are formed on the inner wall of the outer frame portion or on the vanes so as to be integrated with the outer frame portion or vanes.

A magnetron with a filter case housing a through-type capacitor and a choke coil wherein a mounting plate for the capacitor is fixed in intimate contact with the wall of the filter case along a line encircling a through-hole drilled in the wall of the filter case for drawing out the terminals of the capacitor.

Magnetron with fifth harmonic suppression projection in through

A cathode structure for a magnetron representative of a self-oscillation type microwave electron tube comprises a pair of opposite end shields for supporting both ends of a filament helically wound in an axial direction, and a getter fixed on at least an upper end shield positioned on the side of a terminal from which a microwave oscillation output is produced. The upper end shield is concaved with respect to a lower end shield, and the getter provided on the upper end shield is also concaved so as to be closely fitted over substantially the entirety of an outer surface of the upper end shield. Preferably, the getter provided on the upper end shield has an upright annular wall of a central burring hole. Thus, the improved cathode structure is immune to deformation and suitable for cleaning and welding, thereby ensuring improved lifetime stability and high fabrication efficiency.

Cathode structure for magnetron

In a forced air cooled type magnetron device having a plurality of cooling fins, the opposite ends of each fin are provided with a plurality of tongue shaped pieces and alternate pieces are bent in the opposite directions to enhance turbulence.

Magnetron device

In an inner magnet type magnetron wherein a pair of permanent magnets axially magnetized are opposed to each other with an interaction space therebetween within a vacuum enclosure comprising a cylindrical anode, a repulsive magnet magnetized in a direction substantially perpendicular to the magnetization direction of the permanent magnet is arranged in the proximity of one end of the permanent magnet close to the interaction space, thereby preventing leakage flux from the permanent magnet to the inner wall of the cylindrical anode.

Magnetron

The cathode filament of a magnetron is constituted by a metallic cylindrical body provided with a plurality of perforations. The cylindrical body may be made of a cylinder or formed by helically winding a web of a metal strip.

Cathode structure for magnetrons

In a microwave generating device utilizing a magnetron a switching element is connected in the circuit of the cathode heater of the magnetron and ON/OFF-controlled at a predetermined frequency for varying the high frequency output of the microwave generating device.

Microwave generating device utilizing a magnetron

The radial vanes secured to the inside of a cylindrical anode electrode are short-circuited by inner and outer strap rings which are secured to alternate vanes. The intermediate portions of the strap rings between the points at which the strap rings are secured to the vanes are projected outwardly.

Growing community of inventors

Mobara, Japan

Tomokatsu Oguro