JP3108313B2 - microwave - Google Patents

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 stored in a cavity.

[0002]

2. Description of the Related Art In a microwave oven of this type, a microwave is introduced into a cavity to create an electric field, and food is heated through electric lines of force. However, since it is difficult to create a uniform electric field in the cavity, the food cannot be heated uniformly.

Therefore, irregularities are provided on the inner surface of the cavity to reflect the microwave irregularly (Japanese Utility Model Publication No. 48-24206 and Japanese Utility Model Publication No. 47-34).
553) was still insufficient with respect to uniform heating. On the other hand, the position of the food is changed by rotating a tray for placing the food, but in this case, uniform heating is still insufficient.

[0004]

By the way, the distance between the food whose position changes as described above and the peripheral wall surface of the cavity repeatedly increases and decreases at a constant period with the rotation of the tray (see FIG. 6). ). Therefore, the microwave received by the food due to the reflection from the peripheral wall surface repeats its strength at the above-mentioned constant cycle.

The inventor of the present application considered that if the history of the intensity of the microwaves could be repeated more frequently, more uniform heating could be performed. The present invention has been made based on the above idea, and it is an object of the present invention to provide a microwave oven capable of uniformly heating an object to be heated by frequently repeating the history of microwave strength.

[0006]

In order to solve the above-mentioned problems, a microwave oven according to the present invention comprises: a cavity in which an object to be heated is accommodated; a microwave oscillating unit for supplying microwaves into the cavity; In a microwave oven having a shaft protruding from the center of a bottom plate defining a cavity and rotated by driving means arranged outside the cavity, and a tray connected to the shaft and rotated to place an object to be heated. , On the side plate that constitutes the above cavity
On the side of the food placement space near the top of the tray
Steps or corners protruding into the cavity
The convex part of the convex curved surface shape is related to the rotation direction of the pan.
It is characterized by providing a plurality .

[0007]

[0008]

[0009]

According to the structure of the first aspect of the present invention, a plurality of undulating portions which are undulated in relation to the rotation direction of the tray are provided on the side of the space where the object is to be heated. Is frequently increased or decreased with the rotation of the object to be heated. Therefore, the object to be heated records a great deal of the intensity of the microwave reflected from the partition wall surface.

Further , according to the first aspect of the present invention , the receiving
In the part located on the side of the food placement space near the top of the dish,
Since multiple undulations are provided to protrude into the cavity,
The intensity of the microwave received by the heating material is repeated many times,
Since the uneven portion is formed of a convex surface, and the convex surface is formed of a convex curved surface having no steps or corners, the microwave diffusion effect is extremely high.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic perspective view showing a state in which a door of a microwave oven according to a first embodiment of the present invention is opened, and FIG. 2 is a front view of the microwave oven with a door opened. Referring to FIGS. 1 and 2, the present microwave oven A includes a range body 1 having a horizontally long cavity 2 for accommodating an object to be heated, and a door 4 attached to a front portion 1 a of the range body 1. ing. The door 4 opens and closes the opening 3 of the cavity 2 formed in the front part 1a.

An operation section 11 having various operation switches 11a for selecting and setting a desired cooking mode is provided adjacent to the door 4 on the front section 1a.
Referring to FIGS. 1 and 2, range main body 1 has outer box 5 for partitioning the outer surface of range main body 1, and top plate 6 and bottom plate as partition plates for partitioning cavity 2 in outer box 5. 7,
It has a rear plate 8, a left side plate 9 and a right side plate 10. The cavity 2 is defined by the top plate 6, bottom plate 7, rear plate 8, left side plate 9, right side plate 10 and door 4.

Referring to FIG. 3, which shows a schematic side view of a cavity of a microwave oven, a magnetron 12 as a microwave oscillating unit for generating microwaves is provided on the back of right side plate 10.
Is arranged. The microwave generated by the magnetron 12 is supplied into the cavity 2 through a power supply port 13 formed in the right side plate 10. The power supply port 13 is covered with a mica plate through which microwaves pass.

On the other hand, the top plate 6 is provided with a punching portion 6a having an infinite number of punching holes, and a long infrared heater (not shown) for heating the oven is provided above the punching portion 6a. Are located. 2 and 3
, A shaft 17 that is rotated by a motor 23 as a driving unit disposed outside the cavity 2 projects from the center of the bottom plate 7 into the cavity 2. A circular tray 19 (a so-called turntable) on which an object is placed is placed.

Referring to FIGS. 2 and 3, left side plate 9, rear plate 8, and right side plate 10 are provided with cavities 2 near the upper surface of saucer 19 and on the side of heated object placement space B.
A plurality of convex portions 30 as a plurality of undulating portions projecting inward are provided in a two-row strip shape. Each convex portion 30 has a spherical shape. Referring to FIG. 4, the distance e between the door 4, the left side plate 9, the rear surface plate 8, and the right side plate 10, which constitutes the object to be heated A placed on the tray 19 and the peripheral wall surrounding it, is With respect to the 19 rotation phases, the rotation phase changes as shown in FIG. It can be seen that the distance e between the left side plate 9, the rear plate 8, and the right side plate 10 and the object A to be heated frequently repeats the increase and decrease due to the influence of the convex portion 30. However, the tray 19 rotates clockwise in plan view.

According to this embodiment, the periphery of the space B to be heated is surrounded by the convex portions 30 as band-like undulating portions formed on the rear plate 8 and the left and right side plates 9 and 10. Therefore, with rotation of the tray 19,
Rear plate 8 and left and right side plates 9, 10 as partition wall surfaces
And the distance to the object A to be heated can be frequently increased or decreased. As a result, the intensity of the microwave can be recorded in the object to be heated A many times, and the object to be heated A can be uniformly heated.

In particular, since the undulating portion is constituted by the convex portion 30, the effect of diffusing the microwave can be enhanced, so that the object to be heated A can be more uniformly heated. In addition, since the convex portion 30 has a spherical shape, the effect of diffusing the microwave can be further enhanced, so that more uniform heating can be performed. The convex portion is not limited to a spherical surface, but may be an elliptical surface, a paraboloid, or any other convex curved surface having no steps or corners. Further, as the undulating portion, a wave-shaped portion having a curvature only in the rotation direction of the tray 19 can be adopted. Further, an uneven surface as an undulating portion can be employed.

The effect of the present invention can be sufficiently achieved even when the undulating portion is provided on at least one of the rear plate 8, the left side plate 9 and the right side plate 10. In addition, various changes can be made within the scope of the claims.

[0019]

According to the first aspect of the present invention, the distance between the object to be heated and the partition wall surface is frequently increased or decreased by the undulating portion, and the intensity of the microwave can be recorded in the object to be heated many times. As a result, the object to be heated can be heated uniformly .

According to the present invention, the upper surface of the receiving tray is provided.
In the part located on the side of the nearby food placement space,
The convex part of the convex curved surface shape with no steps or corners protruding into the
Since a plurality of microwaves are provided in relation to the direction of rotation of the pan, the microwave diffusion effect can be enhanced, resulting in more uniform heating.

[Brief description of the 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 a front view of the microwave oven with a door opened.

FIG. 3 is a schematic side view showing the inside of a cavity.

FIG. 4 is a schematic plan view of a cavity.

FIG. 5 is a graph showing a relationship between a distance between an object to be heated placed on a tray and a wall surface and a rotation phase of the tray.

FIG. 6 is a graph showing a relationship between a distance between an object to be heated and a wall surface and a rotation phase of a tray in a conventional microwave oven.

[Explanation of symbols]

 2 Cavity 3 Opening 8 Rear plate 9 Left side plate 10 Right side plate 12 Magnetron 17 Shaft 19 Receiving plate 23 Motor (drive means) 30 Convex portion (undulating portion) A Heated object B Heated object arrangement space e Distance

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshiharu Omori 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Katsuaki Hayami 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Inside Sanyo Electric Co., Ltd. (72) Inventor Ryo Sakai 2-5-5 Keihanhondori, Moriguchi City, Osaka Prefecture Inside Sanyo Electric Co., Ltd. (72) Kayo Sakata 2-5-5 Keihanhondori, Moriguchi City, Osaka Prefecture No. 5 Inside Sanyo Electric Co., Ltd. (56) References JP-A-63-254321 (JP, A) JP-A-52-96447 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24C 7/02 511 H05B 6/64

Claims (1)

(57) [Claims] 1. A cavity in which an object to be heated is accommodated, a microwave oscillating unit for supplying microwaves into the cavity, and a drive protruding from the center of a bottom plate defining the cavity and disposed outside the cavity. In a microwave oven having a shaft rotated by a means, and a pan connected to the shaft and rotated to place an object to be heated, the pan in the side plate constituting the cavity
On the side of the food placement space near the top of the
Convex convex shape with no steps or corners projecting into the cavity
A microwave oven comprising a plurality of surface portions provided in relation to a rotation direction of a receiving tray .