JP3059907B2 - 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, a standing wave of a microwave is generated in the cavity, and it is difficult to create a uniform electric field. For this reason, the density of generated lines of electric force varies from place to place, and the food cannot be heated uniformly.

Therefore, in a conventional microwave oven, a stirrer is attached to a power supply port of the microwave into the cavity to change the angle of incidence of the microwave to 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-mentioned conventional microwave oven,
It was still insufficient to heat the food evenly.

Therefore, irregularities are provided on the inner surface of the cavity to irregularly reflect microwaves (Japanese Utility Model Publication No. 48-24206 and Japanese Utility Model Publication No. 47-34).
553).

[0005]

By the way, the above-mentioned microwave is introduced into the cavity from a power supply port formed in, for example, a side plate. Therefore, when a convex surface or the like for irregularly reflecting the light is provided, the positional relationship between the convex surface or the like and the power supply port is considered to be important in order to uniformly and irregularly reflect the light in the cavity. However, in the above publication, sufficient consideration was not given to the positional relationship between the convex surface or the like and the power supply port, so that it was still insufficient to uniformly heat the food.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an electron which can uniformly heat an object to be heated by uniformly reflecting a microwave introduced into the cavity from a power supply port to every corner of the cavity. It is intended to provide a range.

[0007]

In order to solve the above-mentioned problems, a microwave oven according to the present invention is a microwave oven for heating an object to be heated housed in a cavity by using a microwave, wherein the microwave is supplied into the cavity. A first surface defining a cavity, a second surface defining a cavity adjacent to the first surface, and a second surface disposed on the second surface and projecting into the cavity. And a distance between a center position of the convex portion and a boundary side between the first surface and the second surface is provided.
It is set within the half wavelength of microwave and
The diameter of the convex portion is set to approximately 1/2 wavelength of the microwave.
It is characterized by having.

[0008]

[0009]

According to the present invention, when a convex surface for irregularly reflecting microwaves is provided on the second surface adjacent to the first surface on which the power supply port is formed, the convex surface uniformly distributes the micro-wave into the cavity. We learned that there is a proper position to reflect the waves. The present invention has been made based on such knowledge, and since the convex portion is disposed within a distance of 波長 wavelength or less from the boundary side between the first surface and the second surface, the convex portion is uniformly formed in the cavity. As a result, the object to be heated can be uniformly heated.

[0010] Further, by forming the above-mentioned convex portion into a spherical shape, the microwave can be further diffused and reflected. In this case, it is preferable to make the diameter of the convex portion approximately half the wavelength in order to enhance the microwave diffusion effect.

[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 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 dish 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 dish plate and placed on a tray, and FIG. 4 shows a state in which the tray and the like are removed. Is shown.

Referring to FIGS. 1 and 2, the present microwave oven A
Includes 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 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 part 1a. In FIG. 2, reference numeral 22 denotes a square plate for placing an object to be heated, which is accommodated in the cavity 2 when necessary.

An operation section 11 provided with 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. 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 the 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
Are the top plate 6, bottom plate 7, rear plate 8, left side plate 9,
It is partitioned by the right side plate 10 and the door 4. The right side plate 10 constitutes a first surface, and the top plate 6 constitutes a second surface.

Referring to FIG. 5, a magnetron 12 for generating microwaves is disposed in a space formed between right side plate 10 and the surface of outer box 5 opposed thereto. 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. Reference numeral 14 denotes a radiation antenna for radiating microwaves from the magnetron 12 into the cavity 2.

Referring to FIG. 6, which is a schematic side view showing the internal configuration of the microwave oven, a top plate 6 and an outer box 5 opposed thereto are shown.
Two long infrared heaters 15 for heating the oven are arranged in a space defined between the first and second surfaces. Reference numeral 16 denotes a reflection plate for the infrared heater 15. Reference numeral 6a denotes a punched portion having an infinite number of punched holes. 3 and 4
Referring to FIG. 7, a large convex portion 61 and a plurality of small convex portions 62 are arranged at the center of front panel 6 in the front-rear direction. The large convex portions 61 are arranged at positions close to the power supply port 13, and the small convex portions 62 are dispersedly arranged in three front and rear rows along the left-right direction.

Each of the convex portions 61 and 62 has a spherical shape.
Referring to FIG. 8, the height h of large convex portion 61 is 4.5 m.
m, and the diameter R is set to a half wavelength (60 mm) of the microwave. In addition, a boundary side L between the central portion of the large convex portion 61 and the top plate 6 and the right side plate 10.
Is set to a half wavelength (60 mm).

Referring to FIGS. 4 and 5, a shaft 17 rotated by a motor (not shown) disposed outside cavity 2 extends from the center of bottom plate 7 into cavity 2.
The shaft 17 is connected to a metal-made rotation receiving base 18 having a lattice shape. A tray 19 (a so-called turntable, see FIGS. 1 and 3; not shown in FIG. 5) made of a circular glass or the like on which food or the like is placed is placed on the rotation receiving table 18. I have. Referring to FIGS. 3 to 5, a plurality of convex portions 71 protruding into cavity 2 are formed at the four corners of bottom plate 7 on the outer periphery of rotation receiving table 18, that is, receiving tray 19.

Referring to FIG. 3, FIG. 4 and FIG. 6, guide rails 20 and 21 are formed in upper and lower two stages on left side plate 9 and right side plate 10, respectively. The guide rails 20 and 21 are adapted to mount a square plate 22 used for oven cooking such as gratin, for guiding the square plate 22 into and out of the cavity 2 when necessary. Things. The guide rails 20 and 21 provided on the right side plate 10 are divided into two parts at a portion where they are interfered by the power supply port 13. The left side plate 9 has guide rail portions 20 and 21.
A plurality of spherical convex portions 91 projecting into the cavity 2 are dispersedly arranged at a position separated by a predetermined distance upward from. Also with respect to the right side plate 10, the convex portions 101 are dispersedly arranged at positions avoiding the power supply port and the guide rail portions 20, 21 (see FIGS. 3 and 4).

Referring to FIGS. 3 and 4, rear plate 8 includes
A plurality of convex portions 81, 82, 8 projecting into the cavity 2
A convex surface group 80 composed of 3, 84 is formed. According to this embodiment, the large convex portion 6 is located within a distance of １ ／ wavelength or less from the boundary side L between the top plate 6 and the right side plate 10.
Since the large-sized convex portion 61 is disposed, the large-sized convex portion 61 can uniformly diffuse into the cavity 2 and reflect the microwave, so that the object to be heated can be uniformly heated.

In particular, by forming the large convex portion 61 into a spherical shape, microwaves can be further diffused and reflected, and the diameter of the large convex portion 61 can be set to approximately 1/2 wavelength. By doing so, it is possible to enhance the microwave diffusion effect and achieve more uniform heating. Further, since the plurality of small convex portions 62 are arranged in a distributed manner, heating can be performed more uniformly. Heating test 1) Test object In the above example, leaving only the large convex portion 61,
A microwave oven in which the other convex portions 62, 71, 81 to 84, 91 were eliminated was manufactured. As the microwave oven, a plurality of microwave ovens were prepared in which the distance P between the large convex portion 61 and the boundary side L was variously set. However, the length of the top plate 6 in the left-right direction was 320 mm.

On the other hand, the convex portions 61, 62, 71, 81-8
A microwave oven without 4,91 was produced. 2) Test contents A mug filled with milk was stored in the cavity of various microwave ovens provided with only the large convex portion 61, and 500
After heating at W for 130 seconds, the temperature difference ΔT between the upper and lower portions of the milk was measured. As a result, the distance P and the temperature difference ΔT
And sought a relationship. FIG. 9 shows the result.

Referring to FIG. 9, in a microwave oven provided with only large convex portion 61, distance P is 波長 wavelength (60 m).
m) or less, the temperature difference ΔT is very small, and when it exceeds this, the temperature difference ΔT rises sharply and increases by one wavelength (120 m
m) and converge to a substantially constant value. This allows
A large convex portion 61 having a diameter R of a half wavelength, and a boundary side L
It has been proved that the distance P with respect to is preferably set to a half wavelength or less. In the case of the microwave oven having no convex portion, the level was the same as the converged constant value.

FIGS. 10 to 14 show another embodiment of the present invention. In the second embodiment shown in FIG. 10, a pair of punching portions 6a provided in the first embodiment is provided only on the rear side of the top plate 6, and a small convex portion 62 is provided on the front side.
Were distributed. The third embodiment shown in FIG.
0 is different from the second embodiment in that two large convex portions 61 are arranged side by side.

In the fourth embodiment shown in FIG. 12, a single punching portion 6a is arranged at the center of the top plate 6 in the front-rear direction.
A large convex portion 61 is provided before and after the punching portion 6a.
And small convex portions 62 are dispersedly arranged in the remaining portion. According to the present embodiment, the large convex portion 61
Are provided, more uniform heating can be performed. FIG.
In the fifth embodiment shown in FIG. 5, the punching portion 6a is eliminated, two large convex portions 61 are arranged side by side, and a plurality of small convex portions 62 are dispersed and arranged in the remaining portion.
According to this embodiment, since two large convex portions 61 are provided, more uniform heating can be performed.

In the sixth embodiment shown in FIG. 14, the punching portion 6a is eliminated, and three large convex portions 61 are arranged side by side, and a plurality of small convex portions 62 are dispersed and arranged in the remaining portion. . According to the present embodiment, the large convex portion 61
Are provided, so that more uniform heating can be performed. In addition,
The present invention is not limited to the above embodiments, and the surface forming the convex portion 61 only needs to be adjacent to the surface on which the power supply port 13 is formed. Therefore, for example, the power supply port 13
Is formed on the top plate 6, the convex portion 61 is formed on any one of the rear plate 8, the left side plate 9, and the right side plate 10 as a surface adjacent thereto.

The convex portions 61 and 62 are not limited to spherical surfaces, but may be elliptical surfaces, paraboloids, or other curved surfaces having a curvature in two intersecting directions. In addition, various changes can be made within the scope of the claims, such as eliminating the small convex portion 62.

[0027]

According to the present invention, the convex portion is disposed within a distance of not more than 1/2 wavelength from the boundary between the first surface and the second surface. As a result, the object to be heated can be uniformly heated. In particular, by making the convex portion spherical, the microwave can be further diffused and reflected, and furthermore, by making the diameter of the convex portion approximately half the wavelength, the microwave diffusion effect can be obtained. To increase
More uniform heating can be achieved.

[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 an exploded perspective view of a microwave oven and a square dish with a door opened.

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

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

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

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

FIG. 7 is a front view of a top panel.

FIG. 8 is a schematic side view of a cavity showing a positional relationship between a large convex surface and a power supply port.

FIG. 9 is a graph showing a relationship between a distance P between a large convex portion and a boundary side and a temperature difference ΔT between upper and lower portions of milk in a mug.

FIG. 10 is a front view of a top panel according to a second embodiment of the present invention.

FIG. 11 is a front view of a top panel according to a third embodiment of the present invention.

FIG. 12 is a front view of a top panel according to a fourth embodiment of the present invention.

FIG. 13 is a front view of a top panel according to a fifth embodiment of the present invention.

FIG. 14 is a front view of a top panel according to a sixth embodiment of the present invention.

[Explanation of symbols]

 2 Cavity 3 Opening 6 Top plate (2nd surface) 7 Bottom plate 8 Rear plate 9 Left side plate 10 Right side plate (1st surface) 13 Power supply port L Boundary side

──────────────────────────────────────────────────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-6-223959 (JP, A) JP-A-52-96447 (JP, A) JP-A-1-155123 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F24C 7/02 511 H05B 6/64

Claims (1)

(57) [Claims] 1. A microwave oven for heating an object to be heated housed in a cavity by microwaves, wherein a power supply port for supplying the microwaves into the cavity is formed, and a first surface defining the cavity; A second surface defining a cavity adjacent to the first surface, and at least one convex portion disposed on the second surface and protruding into the cavity; a central position of the convex portion; A distance between a boundary side between the first surface and the second surface is set to be within a half wavelength of the microwave , and a diameter of the convex portion is approximately 1 mm of the microwave.
A microwave oven characterized by being set to / 2 wavelengths .