Matsushita Electric Industrial Co., Ltd.

Hirofumi Yoshimura

Nobuo Ikeda

Junzo Tanaka

Shigeru Kusunoki

Masato Yamauchi

Toshiyuki Ishiguro

Fumihiko Migaki

Teruhisa Takano

Noboru Kurata

Hisahiro Nishitani

Yuji Hayakawa

Kazuho Sakamoto

Mitsuo Akiyoshi

Ikuhiro Inada

Masato Matsuda

Toyotsugu Hatagawa

Masahiro Nitta

Susumu Idomoto

Yoshiyuki Takada

Tomoyuki Hosokawa

The present invention provides a high frequency heating apparatus having a structure, which can be mounted/dismounted an air-exhausting grille without any tools. In this apparatus, an air-exhausting grille is arranged by that a fixing claw portion having a bent Z-shape, a fixing hooking portion having a concave notch, and a magnetic joint plate are arranged, whereas a main body located opposite to the air-exhausting grille is arranged by that a slit hole, a hooking flange, and a magnetic fixing plate are arranged. As a result, since the magnetic joint plate is absorbed with the magnetic fixing plate to be fixed with each other, the mounting/dismounting work capability of the air-exhausting grille can be improved without using the tool in a simple manner, and furthermore, a clean cooking appliance can be secured, while the cooking appliance can be readily cleaned.

High frequency heating apparatus

A high frequency heating apparatus is equipped with an oven hood fan, including a heating chamber for entering/deriving an article to be heated into/from the heating chamber, an electric power supplying apparatus for radiating electromagnetic waves into the heating chamber, a cooling fan for cooling the electric power supplying apparatus, another heat-cooking apparatus operated by gas or electric power, which is installed under an appliance main body, and a ventilation fan for sucking hot air from an air intake port, which is generated from the another heat-cooking apparatus, and for exhausting the sucked hot air. In the apparatus, wind which cools a heat generating unit of the electric power supplying apparatus by the cooling fan is joined onto an air intake path of the ventilation fan.

A high frequency heating apparatus is equipped with an oven hood fan, including a heating chamber for entering/deriving an article to be heated into/from the heating chamber, an electric power supplying apparatus for radiating electromagnetic waves into the heating chamber, a cooling fan for cooling the electric power supplying apparatus, another heat-cooking apparatus operated by gas or electric power, which is installed under an appliance main body, and a ventilation means for sucking hot air from an air intake port, which is generated from the another heat-cooking apparatus, and for exhausting the sucked hot air. In the apparatus, wind which cools a heat generating unit of the electric power supplying apparatus by the cooling fan is joined onto an air intake path of the ventilation fan.

The present invention provides a high frequency heating apparatus having a structure, which can be mounted/dismounted an air-exhausting grill without any tools. In this apparatus, an air-exhausting grill is arranged by that a fixing claw portion having a bent Z-shape, a fixing hooking portion having a concave notch, and a magneto joint plate are arranged, whereas a main body located opposite to the air-exhausting grill is arranged by that a slit hole, a hooking flange, and a magneto fixing plate are arranged. As a result, since the magneto joint plate is absorbed with the magneto fixing plate to be fixed with each other, the mounting/dismounting work capability of the air-exhausting grill can be improved without using the tool in a simple manner, and furthermore, a clean cooking appliance can be secured, while the cooking appliance can be readily cleaned.

A high frequency heating apparatus equipped with the oven hood comprises a heating chamber, a power supply apparatus for controlling high frequency output power by way of a semiconductor element, ventilation, and illumination for illuminating an object to be heated by another heat-cooking apparatus. Since the high frequency output power is controlled in such a manner that an optimum heating output power is applied in a linear manner for a proper time period, the heating output power can be controlled in the linear manner and the high frequency heating apparatus can be largely reduced in weight. As a result, the highest-speed heat-cooking operation by receiving the maximum high frequency output power can be realized, and the optimum cooking performance can be realized. Both the installation performance of the appliance to the mounting wall plane and the safety performance achieved by stably fixing the appliance can also be largely improved.

High frequency heating apparatus equipped with oven hood

Microwave heating apparatus having a metal plate rotatably disposed in a

There is disclosed a heating cooking device including a heating chamber for heating an object to be heated, a high-frequency oscillator for generating high-frequency electromagnetic waves, a wave guide for guiding the high-frequency electromagnetic waves from the high-frequency oscillator to the heating chamber, a rotary table for supporting thereon the object to be heated for rotation therewith, and a wave stirrer fan for stirring the electromagnetic waves in the heating chamber. A feeder port of the wave guide is disposed at a side of the heating chamber, and the wave stirrer fan is disposed within the wave guide in opposed relation to the feeder port. The high-frequency oscillator is disposed on the side of the feeder port. The feeder port is larger in size than the wave stirrer fan.

Heating cooking device having a wave guide and feeder port disposed

This invention is designed to make uniform the heating of the object inside the heating chamber by turning an internal waveguide which is roughly in a foldable fan shape and located at the bottom of the heating chamber in a structure adapted for feeding high frequency electric waves from the bottom of the heating chamber. In order to have stable gyration of the internal waveguide, and annular protrusion made of a low loss dielectric is placed between the low impedance parts provided on the internal waveguide and the heating chamber bottom surface. In this way, a rotary structure which is economical, easy to assemble and reliable can be realized.

High frequency heating unit with rotating waveguide

A microwave oven with a rotary antenna for feeding electromagnetic waves to a heating chamber. The antenna has a first antenna portion and a second antenna portion which extend in mutually opposite directions and substantially at right angles to a rotary shaft portion, the length of the first antenna portion being greater than that of the second antenna by approximately one quarter of the wavelength of the electromagnetic waves used and the free end of the first antenna portion being bent substantially at right angles thereto for a length not exceeding one quarter of the wavelength to thereby ensure a uniform electric field distribution within the heating chamber. A dielectric seal plate supporting the rotating shaft of the rotary antenna has a tapered cross-sectional configuration projecting into a waveguide to prevent a sharp change of impedance in the waveguide, whereby spark discharge due to a high frequency electric field is effectively prevented even in the absence of a heating load in the heating chamber.

Microwave oven with rotary antenna

The present invention is a high frequency heating apparatus which has a high frequency oscillator for radiating high frequency energy when energized by a high voltage, a waveguide for propagating the high frequency energy from the high frequency oscillator to a heating cavity or heating chamber of the apparatus in which an object to be heated is placed, and an electric wave radiating member provided between and extending into the waveguide and the heating chamber. The electric wave radiating member both couples, through electric waves, the waveguide with the heating chamber and also radiates the high frequency energy into the heating chamber for uniform heat distribution within the heating chamber.

A microwave oven comprising an enclosure including a wall member defining an opening for providing access to a heating cavity, the wall member having a continuous uninterrupted planar surface portion substantially surrounding the access opening. A door is provided for closing the opening in the wall member, the door having a continuous uninterrupted planar surface portion positioned, when the door is closed, opposite and substantially parallel to the planar surface portion of the wall member. An energy seal comprising walls defining a sealing cavity is formed in either the wall member or the door, the sealing cavity extending in a longitudinal direction to substantially surround the continuous uninterrupted planar surface portion of the member in which it is located. A segmented partition wall is interposed between the walls of the sealing cavity thereby separating it into two longitudinally extending spaces. A path is formed by the opposing planar surface portions of the wall member and the door which extends from the heating cavity to the sealing cavity resulting in substantial reduction, in combination with the sealing cavity, in the amount of microwave energy leaking from the heating cavity when the heating cavity is radiated with microwave energy from a microwave generator.

Electromagnetic energy seal for high frequency heating apparatus

A microwave leakage-preventive device for use with a high frequency heating appliance for dielectric heating of an object by high frequency energy has a choke attenuator installed in a door for attenuation of microwaves, the choke attenuator being of the type adapted to enter an oven cavity when the door is closed. A portion of the choke attenuator is received in a recess formed within the door body, so that the choke attenuator entering the oven cavity is made smaller by an amount corresponding to the dimension thereof received in the door body. The width of the recess formed within the door body is made larger than the width of the choke attenuator entering the oven cavity, thereby providing a small-thickness door which is superior in microwave leakage prevention.

Door seal construction for high frequency heating appliance

A high frequency heating appliance which includes a magnetron, which is used as a high frequency oscillator, and which is directly mounted in a heating chamber and which further includes a stirrer fan for ensuring a uniform electric field distribution of high frequency electromagnetic radiation in the chamber; the fan is mounted coaxially with an antenna for the magnetron; the stirrer fan is provided with a vertical metallic segment for high frequency impedance matching and the vertical metallic segment has a horizontal metallic subsegment located on its end which is oriented so as to be substantially at right angles with the vertical metallic segment for providing a sufficient capacitive coupling between the wall of the heating chamber and the horizontal metallic subsegment with an adequate gap being secured from the heating chamber wall supporting the magnetron. The above-noted construction ensures an improved efficiency and improved distribution of the high frequency output of the magnetron.

High frequency heating appliance with an antenna and stirrer assembly

A microwave heating apparatus has a heating chamber in which an object is to be heated both dielectrically by microwave and by radiant energy. A microwave generator for generating microwaves is disposed above the heating chamber, and a radiant energy heater is located within the heating chamber. A rectangular wave guide extends between the generator and an opening in the chamber for guiding the microwaves generated by the generator into the heating chamber from above, the wave guide being bent generally in the shape of the letter Z and the portion of the wave guide other than the portion adjacent the opening into said heating chamber being spaced from the walls of the heating chamber. Thermal insulation is provided between the chamber and the portion of the wave guide spaced from the walls of the chamber.

Microwave heating apparatus

An improved choke seal arrangement, in a microwave oven, in which a slit structure is provided to prevent leakage of microwave energy around the periphery of the door. The slit structure, which has been provided in one of the walls defining the choke cavity in the prior art choke seal arrangement, is provided in a door wall portion spaced apart from the choke cavity so as to facilitate mechanical formation of the choke cavity and also to prevent deformation of the choke cavity wall during use. The choke seal arrangement permits the gap between the wall of the choke cavity and the confronting inner wall of the heating chamber to be smaller than hitherto, and the microwave seal performance further improved.

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Nara, Japan

Hirofumi Yoshimura