JPH08247469A - Micro-wave oven - Google Patents

Abstract

PURPOSE: To enable a micro-wave radiated against a bottom surface plate to be efficiently utilized for heating of a heated item and further to enable the heated item to be uniformly heated. CONSTITUTION: This micro-wave oven is operated such that a heated item A placed on a receptacle pan 19 stored in a cavity 2 is heated with a micro- wave. The receptacle pan 19 is held by a metallic receptacle table 18. A bottom surface plate 7 defining the cavity 2 is formed with a plurality of projecting surfaces 71. In the case that the receptacle pan 1 is made of a non-metallic material such as glass or the like, a part of the projected surfaces 71 is arranged outside the receptacle table 18 and inside an outer periphery 19a of the receptacle pan 19 as viewed in the top plan view.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven for microwave heating food contained in a cavity.

[0002]

2. Description of the Related Art In a microwave oven of this type, microwaves are introduced into a cavity to create an electric field, and food is heated through lines of electric force. However, a standing wave of microwave is generated in the cavity, and it is difficult to form a uniform electric field. Therefore, the density of the generated lines of electric force varies depending on the location, and the food cannot be heated uniformly.

Therefore, in a conventional microwave oven, a stirrer is attached to the microwave power feed port into the cavity to change the incident angle of the microwave and change the position of the standing wave. In addition, the position of the food is changed by rotating a gantry on which the food is placed. However, in the above conventional microwave oven,
It was still insufficient to heat food uniformly.

Therefore, irregularities are provided on the top and side surfaces of the cavity to diffusely reflect microwaves (Japanese Utility Model Publication No. 48-24206 and Japanese Utility Model Publication No. 47).
34553).

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Regarding the bottom surface of the cavity, there is no idea of providing unevenness, so the microwave radiated to the bottom surface is
It was not used efficiently for heating food. Therefore, uniform heating is still insufficient.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a microwave oven capable of uniformly heating an object to be heated by efficiently utilizing the microwave radiated on the bottom surface of the cavity. .

[0007]

In order to solve the above-mentioned problems, a microwave oven according to a first aspect of the present invention is a microwave oscillating microwave for supplying a microwave into a cavity in which an object to be heated is housed. And a shaft that protrudes from the center of the bottom plate that defines the cavity and that is rotated by the drive means that is disposed outside the cavity, and that holds the tray that is connected to this shaft and that is rotated to place the object to be heated. In a microwave oven provided with a pedestal for, at least outside the outer peripheral edge of the pedestal in plan view, in the portion of the bottom plate, a plurality of convex surface portions protruding into the cavity is formed. Characterize.

A microwave oven according to a second aspect of the present invention is the microwave oven according to the first aspect, wherein in the microwave oven according to the first aspect, the tray is made of metal and the convex surface portion is outside the tray in plan view. It is characterized in that it is arranged only outside the peripheral edge. A microwave oven according to a third aspect of the present invention is the microwave oven according to the first or second aspect, wherein the convex surface portion is a convex curved surface having no steps or corners.

[0009]

According to the structure of the present invention, the microwave radiated to the bottom plate can be diffused and diffused in every corner of the cavity by the convex portion formed on the bottom plate. With this, the microwave applied to the portion of the bottom plate outside the outer peripheral edge of the metal pedestal can be efficiently used for heating the object to be heated, and the object to be heated can be uniformly heated. further,
When the saucer is made of a non-metal, since microwaves can pass through the saucer, by arranging the convex surface portions inward and outward from the outer peripheral edge of the saucer in plan view,
A larger amount of microwaves can be diffused and diffusely reflected. In particular, the inwardly arranged convex surface portion can irradiate microwaves from below onto the object to be heated placed on the tray, so that the object to be heated can be heated more uniformly.

If the tray is made of metal,
Since the microwave cannot reach the lower side of the metal saucer, the convex surface portion is outside the outer peripheral edge of the saucer in plan view,
It is sufficient to place it on the bottom plate. Further, when the convex surface portion is a convex curved surface having no step or corner, such as an elliptic surface, a spherical surface, or a parabolic surface, the microwave diffusion effect is high.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. 1 is a schematic perspective view of a microwave oven according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a state in which a square plate is introduced with a door opened.
3 and 4 are front views of the microwave oven with the door opened, FIG. 3 shows a state in which food is placed on a plate and a saucer, and FIG. 4 shows a state in which the saucer and the like are removed. Shows.

Referring to FIGS. 1 and 2, the present microwave oven A
Is provided with a range main body 1 having a horizontally long cavity 2 for accommodating an object to be heated, and a door 4 attached to a front surface portion 1a of the range main body 1. The door 4 opens and closes the opening 3 of the cavity 2 formed in the front surface portion 1a. In FIG. 2, reference numeral 22 denotes a square plate for placing an object to be heated, which is housed in the cavity 2 when required.

On the front face portion 1a, an operation portion 11 having various operation switches 11a for selecting and setting a desired cooking mode is provided adjacent to the door 4.
With reference to FIGS. 3 and 4 and FIG. 5 which is a cross-sectional plan view of the microwave oven, the range body 1 defines an outer box 5 that defines an outer surface of the range body 1, and a cavity 2 in the outer box 5. It has a top plate 6, a bottom plate 7, a rear plate 8, a left side plate 9 and a right side plate 10 as partition plates. Cavity 2
Is the top plate 6, the bottom plate 7, the rear plate 8, the left side plate 9,
It is partitioned by the right side plate 10 and the door 4.

Referring to FIG. 5, a magnetron 12 as a microwave oscillating unit for generating microwaves is arranged in a space formed between the right side plate 10 and the surface of the outer casing 5 facing the right side plate 10. ing. The microwave generated by the magnetron 12 is supplied to the power supply port 13 formed on the right side plate 10.
It is supplied into the cavity 2 via. Reference numeral 14 is a radiation antenna for radiating the microwave from the magnetron 12 into the cavity 2.

Referring to FIG. 6 which is a schematic side view showing the internal structure of the microwave oven, a top plate 6 and an outer case 5 facing the top plate 6 are shown.
Two long infrared heaters 15 for heating the oven are arranged in a space defined between the surface and the surface of the infrared heater. Reference numeral 16 is a reflector for the infrared heater 15. Reference numeral 6a is a punching portion in which numerous punching holes are formed. With reference to FIGS. 3 and 4, a large convex surface portion 61 is arranged on the top plate 6 at a position close to the power supply port 13, and a small convex surface portion is provided at a position which is the remaining portion and avoids the punching portion 6a. 62
Are distributed.

Referring to FIGS. 4, 5 and 7, the bottom plate 7
A shaft 17 that is rotated by a motor 23 (see FIG. 7) arranged outside the cavity 2 projects from the central portion of the inside of the cavity 2 to the inside of the cavity 2. The shaft 17 is a grid-shaped metal pedestal. It is connected to 18 so as to be integrally rotatable. A non-metal tray 19 (a so-called turntable, see FIGS. 1, 3, and 7; not shown in FIG. 5) made of circular glass or the like on which foods and the like are placed is mounted on the pedestal 18. It is supposed to be posted. Saucer 1
9 has a diameter slightly larger than that of the pedestal 18.

Further, referring to FIGS. 3 to 5 and 7, a spherical convex portion 71 projecting into the cavity 2 is provided in the bottom plate 7 inside and outside the tray 19. A plurality is formed. Some of the plurality of convex surface portions 71 are arranged on the portion of the bottom plate 7 outside the outer peripheral edge 19a of the tray 19, and the other ones are arranged on the tray 19
Of the bottom plate 7, which is inside the outer peripheral edge 19a and outside the outer peripheral edge 18a of the pedestal 18.

With reference to FIGS. 3, 4 and 6, the left side plate 9 and the right side plate 10 are provided with upper and lower guide rails 20 and 21, respectively. These guide rails 20 and 21 are adapted to carry a square plate 22 used for oven cooking such as gratin, and guide the square plate 22 into and out of the cavity 2 when required. It is a thing. The guide rails 20 and 21 provided on the right side plate 10 are divided into two parts, each of which is interrupted at a portion interfered with by the power supply port 13. Further, the left side plate 9 has guide rail portions 20, 21.
A plurality of spherical convex surface portions 91 projecting into the cavity 2 are arranged at positions separated by a predetermined distance above from. Also on the right side surface plate 10, the convex surface portions 101 are dispersed and arranged at positions avoiding the power supply port 13 and the guide rail portions 20 and 21 (see FIGS. 3 and 4).

Referring to FIGS. 3 and 4, the rear plate 8 has
A plurality of convex surface portions 81, 82, 8 protruding into the cavity 2
A convex surface group 80 composed of 3, 84 is formed. According to this embodiment, the tray 19 is made of non-metal,
Since microwaves can pass through the saucer 19, the outer peripheral edge 1 of the saucer 19 is outside the pedestal 18 in a plan view.
By disposing the convex surface portions 71 inside and outside 9a, a larger amount of microwaves can be diffused and diffusely reflected. In particular, the convex surface portion 71 disposed inside the outer peripheral edge 19a of the saucer 19 in plan view can irradiate the object A to be heated placed on the saucer 19 with microwaves from below as shown in FIG. Therefore, the object A to be heated can be heated more uniformly.

Further, since the convex surface portion 71 is formed of a spherical surface, the microwave diffusion effect can be enhanced, and as a result, more uniform heating can be performed. In the above embodiment, when the pedestal 18 is also made of non-metal, the convex surface portion 7
1. The bottom plate 7 located inside the outer peripheral edge 18a of the pedestal 18
Can be placed in the part.

On the other hand, when the tray 19 is made of metal, the convex surface portion 71 is placed on the bottom plate 7 outside the outer peripheral edge 19a of the tray 19 in plan view, as shown in FIG. Is enough. Also in this case, the microwave applied to the portion of the bottom plate 7 outside the tray 19 can be efficiently used for heating the object to be heated, and the object to be heated can be uniformly heated.

Further, for example, the convex surface portion is not limited to a spherical surface, but may be an elliptic surface, a parabolic surface, or any other convex curved surface having no steps or corners. Besides, various modifications can be made within the scope of the claims.

[0023]

According to the structure of the present invention, the microwave radiated to the bottom plate portion outside the outer peripheral edge of the pedestal made of metal can be efficiently used for heating the object to be heated, The object to be heated can be heated uniformly. Further, when the saucer placed on the cradle is made of a non-metallic material, microwaves can pass through the saucer, so that the convex surface portion is outside the cradle in plan view and is more inward and outward than the outer peripheral edge of the tray. By arranging, it is possible to diffuse a larger amount of microwaves and diffusely reflect them. In particular, since the convex portion arranged inward can irradiate the object to be heated placed on the tray with microwaves from below, the object to be heated can be heated more uniformly.

When the saucer is made of metal, microwaves cannot reach below the saucer made of metal.
It suffices to dispose the convex surface portion on the bottom plate portion outside the outer peripheral edge of the tray in plan view. Further, when the convex surface portion is a convex curved surface having no steps or angles, for example, an elliptical surface, a spherical surface, a parabolic surface, etc., the microwave diffusion effect can be increased, and as a result, more uniform heating can be performed.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a microwave oven according to a first embodiment of the present invention with a door closed.

FIG. 2 is an exploded perspective view of a microwave oven and a square plate with an open door.

FIG. 3 is a front view of the microwave oven with the door opened.

FIG. 4 is a front view of the microwave oven with the door opened, showing a state in which the pan is removed.

FIG. 5 is a cross-sectional plan view of the microwave oven.

FIG. 6 is a schematic side view showing the internal configuration of the microwave oven.

FIG. 7 is a schematic view showing an internal cross section of a cavity.

FIG. 8 is a schematic plan view of a cavity according to a second embodiment of the present invention.

[Explanation of symbols]

 2 cavity 3 opening 6 top plate 7 bottom plate 8 rear plate 9 left side plate 10 right side plate 12 magnetron 17 shaft 18 pedestal 18a outer peripheral edge 19 saucer 19a outer peripheral edge 71 convex portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshiharu Omori 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Katsuaki Hayami 2-5 Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd. (72) Inventor Ryo Sakai 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kayo Sakata 2 Keihan Hondori, Moriguchi-shi, Osaka 5-5, Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A cavity for accommodating an object to be heated, a microwave oscillating section for supplying microwaves into the cavity, and a drive which is protruded from the center of a bottom plate partitioning the cavity and is arranged outside the cavity. A microwave oven equipped with a shaft rotated by means and a metal pedestal that is connected to the shaft and is rotated to hold a saucer on which an object to be heated is placed. A microwave oven characterized in that a plurality of convex surface portions projecting into the cavity are formed at a portion of the bottom plate located at least outside the peripheral edge. 2. The microwave oven according to claim 1, wherein the saucer is made of metal, and the convex surface portion is arranged only outside the outer peripheral edge of the saucer in plan view. . 3. The microwave oven according to claim 1 or 2, wherein the convex surface portion is a convex curved surface having no steps or corners.