Panasonic Intellectual Property Management Co., Ltd.

Mikio Fukui

Takashi Uno

Daisuke Hosokawa

Fumitaka Ogasawara

Koji Yoshino

Yoshiharu Oomori

Shinji Takano

Takahiro Hayashi

Motoyoshi Iwata

Yuichi Otsuki

Seiichi Yamashita

Toshifumi Kamiya

Masayoshi Hiramoto

Chikako Hosokawa

An RF energy radiation device of this disclosure comprises: an oscillator; a power amplifier; a radiation element; a detector; and a controller. The oscillator generates an RF signal. The power amplifier amplifies the RF signal to output RF power. The radiation element radiates the RF power. The detector detects progressive wave power. The controller performs an RF power output control using a closed-loop control for setting an output set value of the RF power by a closed-loop and an open-loop control for setting the output set value of the RF power by an open-loop. In a burst operation alternately switching between a period of outputting the RF power and a period of stopping the RF power, the controller changes the RF power output control from the closed-loop control to the open-loop control when a specified condition for change is satisfied during the period of stopping the RF power.

Rf energy radiation device

A microwave heating device includes: a heating chamber for accommodating a heating target object, a microwave generator for generating a microwave, and a coaxial connector. The coaxial connector includes a center conductor, an insulator, and an external conductor. The center conductor is connected to an output terminal of the microwave generator. An air gap is defined between the center conductor and the insulator.

Microwave heating device

A microwave treatment device includes a heating chamber for accommodating a heating target, a microwave generator, a feeder, a detector, and a controller. The microwave generator generates a microwave having a frequency in a specified frequency band. The feeder radiates the microwave inside the heating chamber. The detector detects a reflected microwave power reflected from the heating chamber. The controller causes the microwave generator to execute a frequency sweeping in the specified frequency band, and controls the microwave generator according to a temporal change in a frequency characteristic of the reflected microwave power. The temporal change in the frequency characteristic of the reflected microwave power is based on the frequency of the microwave, a level of the reflected microwave power, and a time passed from a start of heating. Thus, it is possible to accurately recognize the progress of cooking while heating the object.

Microwave treatment device

A high-frequency heating apparatus includes: a heating chamber for accommodating a load; a microwave source; at least one radiator; a temperature detector; and a controller. The microwave source generates a microwave and adjusts the frequency and output of the microwave. The at least one radiator radiates a microwave into the heating chamber. The temperature detector detects the temperature in the heating chamber. The controller causes the microwave source to adjust the output of the microwave based on the temperature profile that defines the temperature change in the load, and the temperature in the heating chamber. According to this aspect, food can be heated in accordance with the temperature profile appropriate for the cooking recipe, thereby ensuring the quality of cooked food.

High-frequency heating apparatus

A high frequency heating apparatus of the present disclosure includes a first electrode (), a second electrode (), a high frequency power supply, a position adjuster (), and a controller. The second electrode () is disposed facing the first electrode (). The high frequency power supply supplies high frequency power to the first electrode () or the second electrode (). The position adjuster () adjusts the position of the first electrode (). The controller controls the position adjuster (). The position adjuster () includes a weight (), one or more connecting lines (), one or more pulleys (), and one or more drive units (). The one or more connecting lines () connect the weight () and the first electrode (). The one or more pulleys () support the one or more connecting lines (). The one or more drive units () are attached to the one or more pulleys () and drive the one or more pulleys (). In this embodiment, a heating target can be heated efficiently.

High frequency heating apparatus

A high frequency heating apparatus (A) includes the following components: a first electrode () that is flat; a plurality of flat second electrodes () that are flat; a high-frequency power supply (); a matching unit (); a controller (); and an electric field regulator (). The second electrodes () are placed opposite to the first electrode (). The high-frequency power supply () applies a high-frequency voltage to the first electrode (). The matching unit () is placed between the first electrode () and the high-frequency power supply (), and is impedance-matched with the high-frequency power supply (). The controller () controls the high-frequency power supply (). The electric field regulator () individually adjusts the electric field strengths in a plurality of regions located between first electrode () and the second electrodes (). This aspect can reduce uneven heating.

A microwave treatment device includes a plurality of radiation parts, a transmission line, and a plurality of feeding parts. The plurality of radiation parts includes first, second, and third radiation parts, and radiates a microwave. The transmission line has a loop line structure provided with a plurality of branch parts including first, second, and third branch parts, and transmits the microwave to the first, second, and third radiation parts respectively connected to the first, second, and third branch parts. The plurality of feeding parts includes the first feeding part and the second feeding part arranged in the transmission line at an interval of ¼ or less of the wavelength of the microwave, and transmits the microwave to the transmission line. According to this aspect, a radiation part that radiates the microwave can be selectively switched. This enables the intended heating distribution to be achieved.

In a microwave heating device of the present disclosure, inverter unit drives first and second microwave generators. Cooling unit cools first and second microwave generators and inverter unit. First and second waveguides supplies, to cavity, microwaves generated by first and second microwave generators. First and second microwave generators are disposed side by side in a right-left direction below a bottom surface of cavity. Inverter unit and cooling fan are disposed from the first and second microwave generators toward a front side in order, and first and second waveguides are provided so as to extend in a front-back direction from first and second microwave generators, respectively. According to the present disclosure, the microwave heating device can be further downsized in a right-left direction.

Heating cooker () of the present disclosure includes convection device () that includes fan (), heater (), a first air guide, and second air guide, is communicated with heating chamber () through a suction port and a discharge port provided in back wall () of heating chamber (), and supplies hot air to the heating chamber (). Fan () sucks air inside heating chamber () from the suction port into convection device (), and sends out the air from the discharge port into heating chamber (). Heater () is provided in front of fan (), and heats the sucked air. The first air guide is provided so as to surround heater (), and guides the heated air to the discharge port. The second air guide is provided so as to surround fan () and the first air guide, and guides the heated air to the discharge port. A part of the second air guide is in contact with the first air guide, and another part of the second air guide is isolated from the first air guide. According to the present disclosure, it is possible to more uniformly heat the object to be heated.

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Shiga, Japan

Mikio Fukui