JP3118388B2 - 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 top and side surfaces of the cavity to irregularly reflect microwaves (Japanese Utility Model Publication No. 48-24206 and Japanese Utility Model Publication No. 47-47).
-34553).

[0005]

In the above publication,
Regarding the bottom surface of the cavity, there is no idea of providing irregularities, and therefore, the microwave irradiated on the bottom surface is
It could not be used efficiently for heating food. For this reason, uniform heating was still insufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a microwave oven that can uniformly heat an object to be heated by efficiently using a microwave applied to a bottom surface of a cavity. .

In order to solve the above-mentioned problems, a microwave oven according to the first aspect of the present invention includes a cavity in which an object to be heated is housed, a microwave oscillating section for supplying microwaves into the cavity, and a microwave oven. A shaft protruding from the center of the bottom plate to be sectioned and rotated by driving means arranged outside the cavity, and a metal for holding a tray connected to the shaft and rotated for mounting the object to be heated.
In a microwave oven provided with a base made of metal , a step protruding into the cavity is formed at a portion of a bottom plate that partitions the cavity, which is located at least outside the outer peripheral edge of the metal base in plan view. Convex bay shape with no corners
Wherein a plurality of convex portions are formed.

According to a second aspect of the present invention, in the microwave oven according to the first aspect, the tray is made of metal, and the convex portion is disposed only outside the outer peripheral edge of the tray in plan view. It is characterized by having.

[0009]

According to the structure of the present invention, the microwave applied to the bottom plate can be diffused and diffusely reflected at every corner of the cavity by the convex portion formed on the bottom plate. Thus, the microwave irradiated to the bottom plate portion outside the outer peripheral edge of the metal receiving base 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 non-metal, microwaves can pass through the saucer.By arranging the convex portions inside and outside the outer periphery of the saucer in plan view,
More microwaves can be diffused and diffusely reflected. In particular, the convex portion disposed inward can irradiate the object to be heated placed on the tray with microwaves from below, so that the object to be heated can be more uniformly heated.

In the case where the tray is made of metal,
Since the microwave cannot reach below the metal tray, the convex surface is located outside the outer peripheral edge of the tray in plan view.
It is enough to place it on the bottom plate. Further, when the convex surface portion is formed of a convex curved surface having no steps or corners, for example, an elliptical surface, a spherical surface, a paraboloid, or the like, the microwave diffusion effect is 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 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.

Referring to FIG. 5, a magnetron 12 as a microwave oscillating unit for generating microwaves is arranged in a space formed between right side plate 10 and the surface of outer box 5 opposed thereto. ing. The microwave generated by the magnetron 12 is supplied to a power supply port 13 formed in the right side plate 10.
Through the cavity 2. 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. Referring to FIGS. 3 and 4, on top panel 6, a large convex portion 61 is arranged at a position close to power supply port 13, and a small convex portion is provided at a position other than punching portion 6 a. 62
Are distributed.

Referring to FIG. 4, FIG. 5 and FIG.
A shaft 17 that is rotated by a motor 23 (see FIG. 7) disposed outside the cavity 2 projects from the center of the cavity 2 into the cavity 2, and the shaft 17 is formed of a lattice-shaped metal pedestal. 18 so as to be integrally rotatable. A non-metallic receiving tray 19 (a so-called turntable, see FIGS. 1, 3 and 7; 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 receiving table 18. It can be put on. Saucer 1
9 has a diameter slightly larger than the cradle 18.

Referring to FIG. 3 to FIG. 5 and FIG. 7, spherical convex portions 71 protruding into the cavity 2 are formed on the bottom plate 7 inside and outside the receiving tray 19. A plurality is formed. Some of the plurality of convex portions 71 are disposed on a portion of the bottom plate 7 outside the outer peripheral edge 19a of the tray 19, and others are disposed on the tray 19.
Is located on the bottom plate 7 inside the outer peripheral edge 19a and outside the outer peripheral edge 18a of the cradle 18.

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 13 and the guide rail portions 20 and 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 saucer 19 is made of non-metal,
Since the microwaves can pass through the tray 19, the outer peripheral edge 1 of the tray 19 is outside the tray 18 in a plan view.
By arranging the convex portions 71 inside and outside 9a, a larger amount of microwaves can be diffused and diffusely reflected. In particular, as shown in FIG. 7, the convex portion 71 arranged inside the outer peripheral edge 19 a of the tray 19 in a plan view can irradiate the object to be heated A placed on the tray 19 with microwaves from below. Therefore, the object to be heated A can be more uniformly heated.

Further, since the convex portion 71 is formed of a spherical surface, the microwave diffusion effect can be enhanced, so that more uniform heating can be performed. In the above embodiment, if the receiving base 18 is also made of non-metal, the convex portion 7
1, the bottom plate 7 inside the outer peripheral edge 18 a of the cradle 18.
Can be arranged in the part.

On the other hand, when the tray 19 is made of metal, as shown in FIG. 8, the convex portion 71 is arranged on the bottom plate 7 outside the outer peripheral edge 19a of the tray 19 in plan view. Is enough. Also in this case, the microwave applied to 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 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. In addition, various changes can be made within the scope of the claims.

[0023]

According to the structure of the present invention, the microwave applied to the bottom plate portion outside the outer peripheral edge of the metal cradle can be efficiently used for heating the object to be heated. The object to be heated can be heated uniformly. When the tray placed on the tray is made of a non-metallic material, microwaves can pass through the tray, so that the convex portion is outside the tray in a plan view and inward and outward from the outer peripheral edge of the tray. Is arranged, a larger amount of microwaves can be diffused and diffusely reflected. In particular, the convex portion disposed inward can irradiate the object placed on the saucer with microwaves from below, so that the object to be heated can be more uniformly heated.

When the tray is made of metal, microwaves cannot reach below the metal tray.
It is sufficient that the convex portion is disposed on the bottom plate, which is outside the outer peripheral edge of the tray in plan view. In addition, when the convex portion is formed of a convex curved surface having no steps or corners, for example, an elliptical surface, a spherical surface, a paraboloid, or the like, the effect of diffusing microwaves can be enhanced, so that more uniform heating can be performed.

[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 schematic diagram 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 Cradle 18a Outer edge 19 Receiving tray 19a Outer edge 71 Convex portion

──────────────────────────────────────────────────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 Sanyo Electric Co., Ltd. (56) References JP-A-8-236270 (JP, A) Japanese Utility Model 60-136092 (JP, U) Japanese Utility Model Application 49-54849 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F24C 7/02 511 H05B 6/64

Claims (2)

(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. a shaft which is rotated by means, are rotated is coupled to the shaft, in a microwave oven that includes a metal cradle for holding the pan for placing an object to be heated, received the metallic in plan view A convex bay having no steps or corners protruding into the cavity is provided at a portion of the bottom plate that defines the cavity at least outside the outer peripheral edge of the table.
A microwave oven comprising a plurality of surface-shaped convex portions. 2. The microwave oven according to claim 1, wherein said saucer is made of metal, and said convex portion is arranged only outside the outer peripheral edge of said saucer in plan view. .