JP2003106534A - Microwave oven with toaster function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the toasting problem of a microwave oven having a toaster function. SOLUTION: The microwave oven with the toaster function has a lower surface heating part (movable heater 45) journaled in place, and has a drive which moves between a first position (horizontal position) where an upper surface heating part (upper surface heater 41) and the lower surface heating part 45 become approximately parallel to each other at the top of a heating chamber and a second position where the open side of the lower surface heating part is lowered, so that the oven can bake the surface of bread or the like in a short time. The leakage of microwaves from holes can be prevented and the intrusion of powder of bread from the holes can also be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven with a toaster function provided with a bottom heating section.

[0002]

2. Description of the Related Art Conventionally, in a microwave oven having a so-called oven function having a heater, a ceiling heating part and a bottom heating part are provided on a ceiling wall and a bottom surface in a cooking chamber, respectively, and a toaster function for baking toast by these heaters is provided. Is also used.

When the toast is actually heated, the door on the front of the main body is opened, the grill supported by the side wall support in the cooking chamber is pulled out to the front, and the toast is placed on the grill. After that, the heaters are stored in the inside of the grill, the doors are closed, and the heaters are energized by instructing the start of heating by key operation. Then, the toast placed on the grill is heated on both sides by the top heating part and the bottom heating part.

When the cooking of the toaster is completed, the toaster can be taken out by pulling out the grill again.

By the way, in Japanese Utility Model Publication No. 5-44642,
It is described that, in conjunction with the door, the grill is pulled out to the front and the bottom heating unit is rotated downward.

However, since the heater and the grill operate by different mechanisms, the structure becomes complicated. Further, since the grill moves horizontally, the distance between the upper heating section and the toaster is greatly increased, which makes effective baking difficult.

Further, when such a toaster is installed in a microwave oven, there is a possibility that the high frequency generated by the magnetron will leak from the cooking chamber through the guide groove on the side wall.

[0008]

As described above, in the heating cooker having the conventional heater, there is a strong need to bake the toast more efficiently, but there is a limit in the type having a wide cooking chamber. there were.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a microwave oven with an oven function capable of baking toast in a short time.

[0010]

A microwave oven with a toaster function according to claim 1, wherein a cooking chamber having an opening at the front, an opening / closing door for opening and closing the opening, and an object to be heated in the cooking chamber are heated at high frequency. In a microwave oven with a toaster function, comprising a magnetron, an upper surface heating unit for heating from above the cooking chamber, and a planar lower surface heating unit provided in the cooking chamber, the lower surface heating unit is an axis on the wall surface of the cooking chamber. A driving device is provided which is supported and is capable of switching between a first position where the upper surface heating portion and the lower surface heating portion are substantially parallel to each other in the upper portion of the cooking chamber and a second position where the opening side of the lower surface heating portion is lowered. It is characterized by

According to this structure, since the toast can be baked above the cooking chamber, the surface can be baked in a short time.

Further, since the lower surface heating section is supported by the shaft, it is possible to prevent the microwave from leaking from the hole and also to prevent the bread powder from intruding from the hole.

In the microwave oven with a toaster function according to a seventh aspect of the present invention, the lower surface heating section is provided with a grill.

According to this structure, baking of the toast can be further improved.

In the microwave oven with a toaster function according to the eighth aspect, the fall prevention portion is formed on the opening side of the grill.

According to this structure, it is possible to prevent the toast from dropping when the lower surface heating section is in the lowered state.

In the microwave oven with a toaster function according to claim 9, the microwave oven with a toaster function is provided with a drive device operating section, and the lower surface heating section is at a first position based on a manual operation of the drive device operating section. Alternatively, it can be switched to the second position.

According to this structure, it is possible to manually operate when cleaning the grill, for example, other than when using the toaster function.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

First, a schematic appearance of a microwave oven will be shown.

FIG. 1 is a perspective view showing the whole of the microwave oven with a toaster function. As shown in FIG. 1, the microwave oven with a toaster function is provided with a main body 1 and an opening / closing door 3 which can be opened and closed. .

A cooking chamber 5 is formed inside the main body 1. The cooking chamber 5 has a ceiling wall 5a, a back wall 5b, a bottom wall 5c, and a pair of side walls 5d and 5e facing each other (only 5d is shown in the figure). Is provided.

An opening 7 is provided on the front side of the cooking chamber 5 for taking in and out the food to be cooked, and the opening 7 is opened and closed by the opening / closing door 3.

Behind the pair of side plates 5d, 5e (opposite opening side)
Includes an end portion 45a of the lower surface heating portion 45, which will be described later,
Holes 5f and 5g into which 45b is inserted are formed.

An outer plate 11, a back plate 13 and a bottom plate 15 are attached to the body 1 so as to cover the cooking chamber 3 except for the opening 7, and four support legs 17 are attached to the bottom of the body. ing.

On the front side of the main body, a cooking menu key 19a and a cooking time setting knob 19b are provided on the side of the door 3.
There is provided an operation panel 19 including a start key 19c for starting cooking and a display unit 19d for displaying setting contents and cooking mode.

An operation panel substrate 21 on which a microcomputer or the like is mounted is attached behind the operation panel, and a space behind the operation panel substrate 21 forms a machine room 23.

As shown in FIG. 4, the machine room 23 has a magnetron 25 for high frequency heating, a high frequency transformer 27, an inverter board 33 on which a switching element 29, a high-voltage capacitor 31 and the like are mounted, and a temperature rise in the machine room is prevented. A machine room cooling fan device 35 is provided for this purpose.

The magnetron 25 has a waveguide 37 on the side wall 5e.
It is attached through the waveguide 3 by oscillating.
The object to be heated (food) in the cooking chamber 5 can be heated at a high frequency from the excitation port 39 via 7.

In the space between the ceiling wall 5a and the outer plate 11 of the cooking chamber 5 and the space between the bottom wall 5c and the bottom plate 15, there are respectively a top heater 41 serving as a heating means and a bottom heater serving as a bottom heating portion. 43 is provided. As the top heater and bottom heater, nichrome wire covered with mica material is used.

Inside the cooking chamber 3, there is provided a movable heater 45 which is a lower surface heating section.

A sheathed heater is used as the movable heater 45.

The sheathed heater covers an energization heating element composed of a conductor formed in a spiral shape such as a nichrome wire and an iron chrome wire and which generates heat by energization with an insulator such as magnesium oxide, and its outer periphery has a cylindrical cross section. Is covered with a metal (for example, iron) sheath member.

The energization heat generating portion is provided near both ends of the sheath member and is led out to the outside of the sheath member through the heat resistant lead wire. Insulators are attached to both ends.

The movable heater 45 is bent and formed in a meandering shape as shown in FIG.

The shaft holes 47a are formed in the holes of the side walls 5d and 5e.
Choke parts 47 having 47 are attached,
Both ends 45a and 45b of the lower surface heating portion 45 are inserted into the shaft holes 47a and are rotatably supported. Lead wires 45c are attached to both ends 45a and 45b of the movable heater and are connected to the operation panel substrate 21. By pivotally supporting the end of the movable heater 45, leakage of microwaves can be prevented, and cold air from the cooling fan 35 can be suppressed from entering the cooking chamber 5.

An end portion 45 of the movable heater 45 on the machine room 23 side
A drive mechanism portion 49, which is a drive device for driving the movable heater 45 in the vertical direction, is provided in b.

FIG. 5 is a view showing the drive mechanism section.

The drive mechanism 49 comprises a crank portion 51, a gear A, a gear B and a motor 53, and a convex portion 57 of the gear A is inserted into a hole 59 provided at one end of the crank portion.

A hole 55 provided at the other end of the crank portion 51
The end portion 45b of the movable heater is inserted in the crankshaft 51, the drive shaft 53a of the motor 53 rotates, and the gears A and B rotate via the motor gear 53b, whereby the crank portion 51 moves up and down. As the crank portion 51 moves upward, the lower surface heating portion 45 moves downward (corresponding to the second position), and the crank portion 5
As 1 moves down, the lower surface heating unit 45 moves up, and the upper surface heater 41 and the movable heater 45, which are formed in a planar shape, are in the horizontal position (corresponding to the first position).

The gear A is provided with a step portion 61.
The step portion 61 is composed of a step portion 61a that keeps the micro switch 63 on and a step portion 61b that turns off the micro switch 63 (releases the on state).

These drive mechanism parts 49 are attached to the side wall 5e via the attachment plate 65.

That is, when the lower surface heating section 45 is in the lowest position, the motor 53 is driven and the gear A rotates, so that the crank section 51 moves down. Micro switch 6 while descending
3 continues to be turned on, and when the crank portion 51 is in the most lowered state, the micro switch 63 is turned off, and it is detected that the lower surface heating portion 45 is in the horizontal state. On the contrary, when the motor 53 is driven and the micro switch 63 is switched from OFF to ON, the lower surface heating unit 45 detects that the lower surface heating unit 45 has descended from the horizontal position to the lowest position.

Instructions from the cooking menu key 19a, the setting knob 19b and the start key 19c on the operation panel and the ON / OFF detection signal of the micro switch 63 are transmitted to the microcomputer 67. Further, according to an instruction from the microcomputer 67, driving / stopping of the motor 53 and switching on / off of the top surface heating section 41, the bottom surface heating section 43 and the bottom surface heating section are switched.

The cooking menu key group 19a provided on the front surface of the operation panel 19 is provided with a toast key 69 for selecting a toast function.

By pressing the toast key 69, a control mode for operating the lower surface heating section 45 is started.

A rotating shaft 71 is provided as a rotating fulcrum on both sides of the lower part of the opening / closing door 3, and the rotating shaft 71 is rotatably supported by bearing members 73 provided on both lower parts of the opening 7. Thus, the opening 7 is opened and closed by rotating about the rotating shaft 71 as a fulcrum. A window 75 is provided at the center of the opening / closing door 3, and the window 75 is provided in the cooking chamber 5.
A glass window is attached so that the inside of the can be seen from the outside. Although not shown, a plate-shaped member having punching holes for preventing microwave leakage is attached.

The opening / closing door 3 is provided with a handle 77 on its upper portion, and is opened and closed by pulling the handle 77 toward the front.

A flange 79 is formed on the outer periphery of the opening 7. A hole 81 is provided in the outer peripheral flange portion 79, and the convex portion 3a of the opening / closing door 3 is inserted into the hole 81 when the opening / closing door 3 is closed, and the door switch 82 provided in the machine room 23 is pressed. It is provided in the position where it is opened. This detects the open / closed state of the open / close door.

The grill 83 and the movable heater 45 are fixed by caulking or the like. The grill 83 mounts a toast, and an outer peripheral portion 83a, a mounting portion 83b, and a leg portion 83c are formed by bending and welding a thin metal rod member, and the movable heater 45 is supported by the outer peripheral portion 83a. It functions as a stopper so that the toast does not drop from the grill mounting portion 83b when the toast is lowered.

It is sufficient that the outer peripheral portion 83a of the grill is provided at least on the front side (opening) side.

Next, the specific operation will be described with reference to the flowchart of FIG.

When the toast key 69 of the operation panel 19 of the microwave oven with the toaster function in the standby state is pressed (step 1), the movable heater 45 in the horizontal position is lowered (step 3).

Until the toast key 69 is pressed, the main routine returns to the standby state (step 2).

The user opens the open / close door 3 to place the toast 85 on the grill 83 mounted on the movable heater 45 (steps 4 to 5).

When the door switch 82 detects that the opening / closing door 3 is closed (step 6), the motor 53 is driven. Then, the movable heater 45 is moved through the gears A and B.
Moves up, and the movable heater 45 becomes horizontal (step 7). At this time, the toast 85 placed on the grill 83
Is set with a slight dimension left between the upper heater 41 provided on the ceiling wall 5a and the movable heater 45. That is, it is set above the large cooking space. The reason for setting it in the upper part of the cooking chamber space is that the heat stays in the upper part.

At this time, the movable heater 45 can be passed through.

When the start key 19c is pressed, the upper surface heating unit 41 and the movable heater 45 are energized to generate heat in both heaters, and the toast is cooked (steps 8 to 8).
9).

When the toast key 69 is pressed, it is detected whether or not the preset cooking end condition (for one sheet, for example, 6 minutes) is reached, and heating is continued until the cooking end condition is reached (step 10) Cooking When the end condition is reached,
The energization to the upper surface heater 41 and the movable heater 45 is turned off, and, for example, a sound is emitted to notify the end (step 1
1) The lower surface heating unit 45 is lowered and stopped at the lowest position (step 12).

At this time, since the grill 83 has the outer peripheral portion 83a, the toast does not drop after cooking.

The user can easily take out the toast 85 by opening the opening / closing door 3 (steps 13-).
14) Then, the opening / closing door 3 is closed. When the door switch 82 detects that the open / close door 3 is closed (step 1
5) The movable heater 45 rises and returns to the horizontal position (step 16). After the end, it returns to the main routine.

By returning the movable heater 45 to the horizontal position,
This is because it is easy to put the object to be heated when it is used for other than the toaster function such as microwave heating or heating using the bottom heating unit.

Next, another embodiment will be described.

FIG. 7 shows an operation panel equipped with manual keys.

That is, the operation panel 119 has a manual key 1 which is a drive device operation key for instructing the movable heater to move up and down.
21 is a microwave oven with a toaster function.

The manual key 121 includes a key 121a for moving the movable heater upward and a key 12 for moving the movable heater downward.
1b is provided.

By pressing 121a, the movable heater 145
Moves to the upper position (first position), and the movable heater 145 moves to the lower position (second position) by pressing 121b.

In this embodiment, the key is used, but the invention is not limited to this, and a lever type may be used.

With the above configuration, it is possible to manually operate when cleaning the grill or the like other than when using the toaster function. FIG. 7 shows another example of the movable heater which is the lower surface heating section.

In the first embodiment, the sheathed heater is formed by bending and is formed into a planar shape as a whole.
The movable heater 145 shown in FIG. 7 is formed in a flat plate shape.

The movable heater 145 is a plate-shaped core mica 14
A large number of notches 147a are formed in the long side portion of
49 are alternately hooked on the notches 147a of the two long sides to be arranged in a meandering shape, and are formed as the heat generating portion 151.

An upper cover mica 153 and a lower cover mica 155 are arranged on the upper and lower surfaces of the heat generating portion 151, and the upper and lower surfaces are sandwiched by an upper metal plate 157 and a lower metal plate 159.

Semi-cylindrical parts 157a and 1159a are formed on the left and right inner sides of the upper metal plate 157 and the lower metal plate 159, respectively. Then, the semi-cylindrical portion is formed into a cylindrical shape by the combination of both metal plates, and the shaft portion 161 is formed. This shaft has a diameter substantially the same as the hole in the wall surface of the cooking chamber, and is axially supported in the cooking chamber by the shaft.

Further, the heating wire 1 arranged in the heating section 151.
At both ends of 49, the heat resistant lead wire 163 is led out through the shaft portion space 164, but in both the left and right shaft portion spaces 164,
An insulator 165 is provided.

As described above, since the movable heater 145 has a flat plate shape, the toast can be efficiently baked from the upper and lower surfaces in a shorter time.

That is, the planar lower surface heating portion is sufficient if the portion contributing to heating is planar, and may be, for example, a rod heater having a length corresponding to one side of the grill.

[0077]

As described above, in a microwave oven with a toaster function, toast can be baked in a short time.

Further, since the lower surface heating unit is rotatable by the pivotal support, it is possible to prevent microwave leakage from the hole,
In addition, it is possible to prevent the bread powder from entering through the holes.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire configuration of a microwave oven with a toaster function of the present invention.

FIG. 2 is a sectional view of the microwave oven with a toaster function showing the first position of the lower surface heating unit of the present invention.

FIG. 3 is a cross-sectional view of the microwave oven with a toaster function showing a second position of the lower surface heating unit of the present invention.

FIG. 4 is a top view of a cooking chamber in the microwave oven with a toaster function of the present invention.

FIG. 5 is a diagram showing a drive mechanism section of the present invention.

FIG. 6 is a flowchart of the present invention.

FIG. 7 is a diagram showing another example of the movable heater of the present invention.

[Explanation of symbols]

1 is a main body, 3 is an opening / closing door, 5 is a cooking chamber, 7 is an opening, 19 is an operation panel, 23 is a machine room, 25 is a magnetron, 41
Is a top heating part, 43 is a bottom heating part, 45 is a bottom heating part,
Reference numeral 47 is a choke portion, 49 is a drive mechanism portion, 51 is a crank portion, 53 is a motor, 55 is a crank hole, 57 is a convex portion of the gear A, 59 is a crank hole, 61 is a step portion, 63 is a micro switch, and 67 is a micro switch. A microcomputer, 69 is a toast key, 83 is a grill, and 85 is a toast.

Claims (9)

[Claims] 1. A cooking chamber having an opening in the front, an opening / closing door for opening and closing the opening, a magnetron for high-frequency heating an object to be heated in the cooking chamber, an upper surface heating unit for heating from above the cooking chamber, and cooking. In a microwave oven with a toaster function provided with a planar lower surface heating section provided in a room, the lower surface heating section is axially supported by the cooking chamber wall surface, and the upper surface heating section and the lower surface heating section are in the upper section of the cooking chamber. First that is almost parallel
The microwave oven with a toaster function, which is provided with a drive device that is switchable between a position (1) and a second position where the opening side of the lower surface heating unit is lowered. 2. A microwave oven with a toaster function according to claim 1, further comprising a door switch for detecting opening / closing of the open / close door, wherein the lower surface heating unit is at the first position when the open / close door is closed. . 3. The microwave oven with a toaster function according to claim 1, wherein the lower surface heating unit is capable of cooking when it is at the first position. 4. The toaster function according to claim 1, further comprising a toast key for selecting a toaster function, and when the toaster function is selected by the toast key, the lower surface heating portion is in a second position. Microwave oven. 5. The microwave oven with a toaster function according to claim 1, wherein the lower surface heating portion is at the second position when the heating and cooking conditions selected by the toast key are completed. 6. The microwave oven with a toaster function according to claim 1, wherein the lower surface heating unit is a sheath heater. 7. The microwave oven with a toaster function according to claim 1, wherein the lower surface heating unit is provided with a grill. 8. The microwave oven with a toaster function according to claim 7, wherein a drop prevention portion is formed on the opening side of the grill. 9. A drive device operating part for driving the drive device, wherein the lower surface heating part is switchable to a first position or a second position based on a manual operation of the drive device operating part. The microwave oven with a toaster function according to claim 1.