# US 12,225,653 B2 · Heating device

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- Number: US 12,225,653 B2
- Document ID: US12225653B2
- Status: Granted
- Kind: B2
- Application number: 17/468,788
- Filed: 2021-09-08
- Published: 2021-12-30
- Granted: 2025-02-11
- Earliest claimed: 2019-04-12
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Hiroshi Itakura; Takeshi Oshima
- Web page: https://patentgrep.com/patent/US12225653B2

## CPC

- H05B 6/6482: {combined with radiant heating, e.g. infrared heating}
- H05B 6/686: {Circuits comprising a signal generator and power amplifier, e.g. using solid state oscillators}
- H05B 6/664: {Aspects related to the power supply of the microwave heating apparatus}
- H05B 6/72: Radiators or antennas
- H05B 2206/044: Microwave heating devices provided with two or more magnetrons or microwave sources of other kind
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

The microwave power is distributed to microwave radiation elements arranged rotationally symmetrically around a reference line on a plane on a top face side of a heating chamber by advancing a feeding phase with a phase difference of 360°/2N clockwise or counterclockwise in turn.

## Claims

### Claim 1

A heating device comprising:
a heating chamber in which an object to be heated is housed;
a power generator generating microwave power;
a power distribution circuit distributing the microwave power generated by the power generator into a plurality of microwave powers; and
a plurality of pairs of microwave radiators arranged on at least one plane orthogonal to a reference line set in the heating chamber, the plurality of pairs of microwave radiators each including two microwave radiators being arranged on opposite sides with respect to an intersection point between the reference line and the at least one plane, wherein
the power distribution circuit distributes the plurality of microwave powers to a plurality of microwave radiators included in the plurality of pairs of microwave radiators by setting a phase difference of an angle obtained by dividing 360° by the number of the plurality of the microwave radiators clockwise or counterclockwise in turn around the reference line.

### Claim 2 (depends on 1)

The heating device according to claim 1, wherein the two microwave radiators constituting each of a plurality of the pairs of microwave radiators are arranged at positions equidistant from the intersection point.

### Claim 3 (depends on 1)

The heating device according to claim 1, wherein the plurality of pairs of microwave radiators are arranged rotationally symmetrically around the reference line.

### Claim 4 (depends on 1)

The heating device according to claim 1, wherein the power distribution circuit distributes the microwave power with a phase difference of 180° to the two microwave radiators constituting each of the plurality of pairs of microwave radiators.