JP3510872B2 - microwave - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a microwave oven, and more particularly to a microwave oven including an infrared sensor for detecting the temperature of food in a heating chamber.

[0002]

2. Description of the Related Art There have been conventional microwave ovens equipped with an infrared sensor capable of detecting the temperature of food in a heating chamber. The infrared sensor itself is moved so that the field of view of the infrared sensor can be moved. Therefore, no matter where the food is placed in the heating chamber, the infrared sensor can bring the food into the field of view and detect the temperature of the food.

A microwave oven is equipped with a magnetron which oscillates microwaves. This microwave may become noise with respect to the detection output of the infrared sensor. Then, the wiring for transmitting the signal of the infrared sensor is shielded by ferrite, metal braid or the like in order to prevent the microwave from being mixed into the detection output of the infrared sensor as noise. Therefore, the wiring extending from the infrared sensor is relatively thick and loses flexibility. If the wiring that loses this flexibility is bound like normal wiring, the smooth operation of the infrared sensor itself may be hindered. However, if no restriction is placed on the arrangement of the wiring, the wiring may be in contact with other members in the microwave oven, which is dangerous.

That is, in the conventional microwave oven, it is necessary to place some restrictions on the arrangement of the wiring extending from the infrared sensor. However, if the wires are bound together, the operation of the infrared sensor is hindered, so that there is a problem that the detection performance of the infrared sensor cannot be sufficiently exhibited.

On the other hand, in the conventional microwave oven, the infrared sensor is constructed as shown in FIG. Figure 1
FIG. 7 is an exploded perspective view of the conventional infrared sensor 700.

Referring to FIG. 17, infrared sensor 700
Is covered with an upper case 700c and a lower case 700g. The filter 700f is fitted on the front surface of the upper case 700c. Also, the upper case 700c
A board 700d is included in the lower case 700g. An infrared light receiving element that receives infrared light is mounted on the board 700d. The reflector unit 700e is connected to the upper part of the infrared light receiving element of the board 700d. The reflector unit 700e has two openings. One opening is connected to the infrared receiving element,
The other opening faces the filter 700f.
In the infrared sensor 700, the infrared light receiving element detects the amount of infrared light incident via the filter 700f and the reflecting mirror unit 700e.

In such an infrared sensor, conventionally, there have been cases where the detection performance of the infrared light receiving element, and by extension, the infrared sensor itself cannot be sufficiently exerted due to contamination of various elements such as the filter 700f.

The present invention has been conceived in view of the above circumstances, and an object thereof is to provide a microwave oven capable of sufficiently exhibiting the detection performance of an infrared sensor.

[0009]

A microwave oven according to an aspect of the present invention has a heating chamber for accommodating food and forming a hole, a detection path member connected to the hole, and a field of view. originating from the food in the heating chamber, the infrared within the field of view
An infrared sensor for detecting temperature detected through the detection path member, and a moving means for moving the infrared sensor, wherein
A microwave oven including a dirt prevention plate for preventing dirt of the infrared sensor provided adjacent to a detection path member , wherein the infrared sensor has an infrared light receiving element for receiving the infrared light, and the infrared light receiving element An outer case is covered with an enclosing case, and a detection window for introducing infrared rays in the field of view is provided in the case, and the detection path member of the heating chamber is the infrared ray.
Infrared rays in the heating chamber are provided in a portion facing the detection window of the sensor.
, Forming a detection hole for sending to the infrared sensor, the moving means, in the field of view of the infrared sensor, the dirt prevention plate does not exist between the detection window of the infrared sensor and the detection hole. From the state in which the stain prevention plate is not included, the stain prevention plate is present between the detection window and the detection hole,
The dirt prevention plate is included in the field of view of the infrared sensor, and the infrared sensor can be moved to a standby position in which at least a part of the detection window does not face the detection hole, and the moving means includes the When the infrared sensor is performing infrared detection, the infrared sensor is moved so that the stain prevention plate is not included in the field of view of the infrared sensor, and when the infrared sensor is not performing infrared detection, the infrared It is characterized in that the sensor is moved to the standby position.

A microwave oven according to another aspect of the present invention includes a heating chamber for containing food and forming a hole, and a heating chamber for forming the hole.
A detection path member that is connected, has a viewing, originating from the food of the heating chamber, said detection path member infrared within the field of view
An infrared sensor for detecting and detected temperature via a moving means for moving the infrared sensor, the detection path member
A microwave oven including a stain prevention plate for preventing the infrared sensor from being soiled provided adjacent to the infrared sensor, the infrared sensor comprising a board on which an infrared light receiving element for receiving the infrared light is mounted, and the infrared light receiving board of the board. Connected to the upper part of the element, including a reflecting mirror unit having an inlet for introducing the infrared rays into the infrared ray receiving element and focusing the infrared ray receiving element, and a filter fitted in the inlet, the heating chamber
The detection path member faces the filter of the infrared sensor.
Infrared in the heating chamber to the infrared sensor
Forming a detection hole for sending, the moving means does not include the stain prevention plate between the filter of the infrared sensor and the detection hole, and includes the stain prevention plate in the field of view of the infrared sensor. From the state where the filter is not present, the stain prevention plate is present between the filter and the detection hole, the stain prevention plate is included in the field of view of the infrared sensor, and at least a part of the filter faces the detection hole. Not moving the infrared sensor to a standby position, the moving means, when the infrared sensor is performing infrared detection, the dirt prevention plate is not included in the field of view of the infrared sensor. The infrared sensor is moved, and when the infrared sensor is not performing infrared detection, the infrared sensor is moved to the standby position.

Thus, in the microwave oven, the detection window of the infrared sensor can be prevented from becoming dirty by changing the operation mode of the infrared sensor without providing a member such as a shutter which requires a complicated mechanism.

Therefore, since the detection window of the infrared sensor can be easily prevented from becoming dirty, the detection performance of the infrared sensor can be sufficiently and easily exhibited in the microwave oven.

Further, the stain prevention plate can more effectively prevent the detection window of the infrared sensor from being stained.

Further, the stain prevention plate can prevent the temperature detection accuracy of the infrared sensor from being lowered.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
A description will be given with reference to the drawings.

FIG. 1 is a perspective view of a microwave oven according to an embodiment of the present invention.

Referring to FIG. 1, the microwave oven 1 mainly includes
It is composed of a main body 2 and a door 3. The main body 2 has its outer shell
It is covered by the exterior part 4. Further, on the front surface of the main body 2, an operation panel 6 for the user to input various information to the microwave oven 1 is provided. The main body 2 is supported by a plurality of legs 8.

The door 3 is constructed so that it can be opened and closed with its lower end as an axis. A handle 3 a is provided on the upper portion of the door 3. FIG. 2 shows a partial perspective view of the microwave oven 1 when the microwave oven 1 when the door 3 is opened is viewed from the left front side.

A main body frame 5 is provided inside the main body 2. A heating chamber 10 is provided in the body frame 5. A hole 10a is formed in the upper right side surface of the heating chamber 10. A detection path member 40 is connected to the hole 10a from the outside of the heating chamber 10.

FIG. 3 shows a sectional view taken along the line III-III in FIG. Further, FIG. 4 shows a perspective view of the microwave oven 1 when the microwave oven 1 in a state where the exterior portion 4 is removed is viewed from the upper right. Further, FIG. 5 shows a sectional view taken along the line VV of FIG.

With reference to FIGS. 3 to 5, the detection path member 40 connected to the hole 10a has an opening, and the opening is used as the hole 1
It has a box shape connected to 0a. The infrared sensor 7 is attached to the box-shaped bottom surface of the detection path member 40. A detection hole 11 is formed in a portion of the box-shaped bottom surface of the detection path member 40 that faces the detection window of the infrared sensor 7. The detection window of the infrared sensor 7 is a detection window 7p described later.
(See FIG. 8).

Inside the exterior portion 4, a magnetron 12 is provided so as to be adjacent to the lower right of the heating chamber 10.
A waveguide 19 that connects the magnetron 12 and the lower portion of the heating chamber 10 is provided below the heating chamber 10. The magnetron 12 supplies microwaves to the heating chamber 10 via the waveguide 19.

The heating chamber 10 is provided with a bottom plate 9 on the bottom thereof. A rotating antenna 15 is provided between the bottom of the heating chamber 10 and the bottom plate 9. The antenna motor 16 is provided below the waveguide 19. The rotating antenna 15 and the antenna motor 16 are connected by a shaft 15a. And the antenna motor 16
The rotating antenna 15 is rotated by driving.

In the heating chamber 10, food is placed on the bottom plate 9. The microwave emitted by the magnetron 12 is supplied into the heating chamber 10 via the waveguide 19 while being stirred by the rotating antenna 15. As a result, the food on the bottom plate 9 is heated.

A heater unit 130 is provided behind the heating chamber 10. The heater unit 130 accommodates a heater 13, which will be described later, and a fan for efficiently sending the heat generated by the heater 13 into the heating chamber 10.

The infrared sensor 7 has a visual field. Then, in the microwave oven 1, with respect to the bottom surface of the heating chamber 10, X
The axis and the Y-axis are set. The field of view of the infrared sensor 7 can be moved in the X-axis direction and the Y-axis direction. Here, the X axis and the Y axis set for the heating chamber 10 will be described. FIG. 6 schematically shows the X axis and the Y axis set on the heating chamber 10.

Referring to FIG. 6, in the heating chamber 10, the X axis is set in the width direction and the Y axis is set in the depth direction. Further, the infrared sensor 7 has a visual field 70, and the visual field 7
Infrared rays emitted within 0 can be caught.
The visual field 70 is projected on the bottom surface (the surface including the bottom plate 9) of the heating chamber 10 as a substantially ellipse. The ellipse in FIG. 6 is
It has a major axis in the X-axis direction and a minor axis in the Y-axis direction with the intersection point of the X-axis and the Y-axis (which is also the center of the bottom plate 9) as the center.
The visual field 70 has the position shown in FIG. 6 as its reference position.

Further, referring to FIG. 4, the infrared sensor 7 is provided with an X-direction rotating member 22 and a Y-direction rotating member 24. Further, the infrared sensor 7 is provided with an X-direction rotation motor 23 and a Y-direction rotation motor 25. The X-direction rotating member 22 drives the X-direction rotating motor 23 to move the visual field 70 of the infrared sensor in the X-axis direction. Further, the Y-direction rotating member 24 moves the field of view 70 of the infrared sensor in the Y-axis direction by driving the Y-direction rotating motor 25.

As a result, the infrared sensor 7 operates in the heating chamber 1
Almost the entire bottom surface of 0 can be included in the field of view 70. In FIG. 3 and FIG.
Is shown as a total field of view 700.
That is, particularly with reference to FIG. 5, the field of view 70 moves in the X-axis direction so as to draw a triangle with the detection hole 11 as the apex, the bottom plate 9 as the base, and the apex angle of θ. Further, particularly with reference to FIG. 3, the visual field 70 has the detection hole 1 in the Y-axis direction.
With 1 as the apex and the bottom plate 9 as the base, move so as to draw a triangle whose apex angle is α.

The infrared sensor 7 and the control circuit 30 (see FIG. 7) are connected by the wiring 7b. In addition,
The wiring 7b is shielded with ferrite, a metal braid, or the like in order to prevent microwaves oscillated by the magnetron 12 from being mixed into the detection output of the infrared sensor 7 as noise.

FIG. 7 shows a control block diagram of the microwave oven 1. The microwave oven 1 includes a control circuit 30 that totally controls the operation of the microwave oven 1. Control circuit 30
Includes a microcomputer.

Various information is input to the control circuit 30 from the operation panel 6 and the infrared sensor 7. Then, the control circuit 30, based on the input information and the like, the cooling fan motor 31, the interior lamp 32, the microwave oscillation circuit 33, the heater 13, the X-direction drive motor 23, and the Y-direction drive motor 25.
Control the behavior of. The cooling fan motor 31 is a motor that drives a fan for cooling the magnetron 12. The interior light 32 is an electric light that illuminates the inside of the heating chamber 10.
The microwave oscillation circuit 33 is a circuit that causes the magnetron 12 to oscillate microwaves.

FIG. 8 shows an exploded perspective view of the infrared sensor 7. Referring to FIG. 8, the infrared sensor 7 includes an upper case 7
c, the outer case is covered by the lower case 7g. Upper case 7c
A board 7d is included in the lower case 7g. The board 7d has an infrared light receiving element (described later, which receives infrared light).
An infrared light receiving element 7a) is mounted. Then, the reflecting mirror unit 7 is provided on the infrared receiving element of the board 7d.
e is connected.

The reflecting mirror unit 7e has two openings. One is an outlet 7n, which will be described later, and is connected to the infrared light receiving element. And the other is the inlet 7m. The filter 7f is fitted into the inlet 7m. In the infrared sensor 7, the infrared light receiving element detects the amount of infrared light incident via the filter 7f and the reflecting mirror unit 7e. The inner wall 7h of the reflecting mirror unit 7e is a mirror.

A detection window 7p is formed in the upper case 7c. The detection window 7p faces the filter 7f.
The detection window 7p constitutes a detection window for introducing infrared rays into the infrared sensor.

Here, referring to FIGS. 8 and 9, in the infrared sensor 7, the reflecting mirror unit 7e and the filter 7 are provided.
The positional relationship of f will be described. FIG. 9 shows a reflector unit 7e.
It is a figure which shows the positional relationship of the filter 7f typically.

In the infrared sensor 7, the heating chamber 1 is provided in front of the inlet 7m of the reflecting mirror unit 7c (left in FIG. 9).
The 0 detection hole 11 is located. Then, the infrared rays radiated in the heating chamber 10 are introduced into the inside of the reflecting mirror unit 7c through the introduction port 7m, are appropriately reflected by the inner wall 7h, and are collected, and the infrared ray receiving element 7a is introduced through the extraction port 7n. Be led to.

The filter 7f is fitted in the inlet 7m. Thereby, the area of the filter 7f can be made smaller than the area of the conventional filter. This is shown in FIG.
Further, referring to FIG. 17 and FIG. Figure 10
Infrared sensor 700 for conventional microwave oven shown in FIG.
Reflector unit 700e and filter 700f in
It is a figure which shows typically the positional relationship. As shown in FIG. 10, the board 700d includes an infrared light receiving element 700.
a is installed.

As shown in FIG. 17, conventionally, the filter 700f is fitted in the case (upper case 700c). That is, as shown in FIG.
f is attached to the outside of the reflector unit 700e.

In FIG. 9, the broken line R indicates the range in which the infrared light receiving element 7a can receive infrared rays.
Further, in FIG. 10, the broken line r indicates the infrared receiving element 70.
0a indicates the range in which infrared rays can be received.

In particular, referring to FIG. 9, from the inlet 7m,
As the distance from the reflecting mirror unit 7e increases, the range in which the infrared light receiving element 7a can receive infrared rays becomes wider. As a result, the further the filter 7f is provided from the inlet 7m, the larger the area required for the filter 7f becomes. Then, comparing FIG. 9 and FIG. 10, the filter 7f (see FIG. 9) is lower than the filter 700f (see FIG. 10), that is, the area is smaller.

In the infrared sensor, the smaller the area of the filter is, the smaller the area that may be contaminated becomes. Therefore, as in the present embodiment, the infrared sensor configured so that the area of the filter can be reduced contributes to improvement of detection accuracy by suppressing contamination of the filter in the infrared sensor.

Further, as shown in FIG. 9, the infrared sensor 7
Then, the filter 7f is the introduction port 7 of the reflecting mirror unit 7e.
It is fitted into m. Here, as a comparison, FIG.
In the infrared sensor 7, the state where the filter 7f is fitted on the outlet 7n side of the reflecting mirror unit 7e is shown.

9 and 11 are compared, the heating chamber 10
If a component that becomes dirty, such as food vapor, comes in,
In the example shown in FIG. 9, the component that becomes the stain is the filter 7
It is blocked by f and does not enter the inside of the reflecting mirror unit 7e. On the other hand, in the same case, in the comparative example shown in FIG. 11, the component that becomes the dirt also enters the inside of the reflecting mirror unit 7e. As a result, not only the filter 7f but also the inner wall 7h are contaminated.

From the above, in the case shown in FIG. 9, the infrared rays generated in the heating chamber 10 are contaminated by the dirty filter 7f.
In the case shown in FIG. 11, the infrared rays are further attenuated by the dirty inner wall 7h, though they are attenuated only by. Therefore, the infrared sensor 7 of the present embodiment shown in FIG. 9 has a configuration capable of avoiding the attenuation of infrared rays emitted by the food in the heating chamber 10 as much as possible.

Next, the structure around the infrared sensor 7 in the microwave oven 1 will be described. 12 and 13 are side views of the vicinity of the infrared sensor 7 inside the exterior portion 4 of the microwave oven 1. 12 and 13, for convenience, the Y-direction rotating member 24 and the X-direction rotating member 22 are shown.
Is omitted.

First, referring to FIG. 12, the detection path member 40
The air passage 42 is provided so as to be adjacent to. Wind path 4
2 has an opening at the top. The air passage 42 is provided in order to efficiently use the wind sent from the above-described fan for cooling the magnetron 12 in the infrared sensor 7, as indicated by an arrow B.

It is possible to prevent the filter 7f of the infrared sensor 7 from being contaminated by the soup of the food in the heating chamber 10 flying from the detection hole 11 by sending the wind through the air passage 42.

A wind direction plate 220 is attached below the infrared sensor 7. Thereby, the wind sent from the air passage 42 can be sent more efficiently in front of the filter 7f of the infrared sensor 7. Therefore, it is possible to more reliably prevent the filter 7f from becoming dirty.

Further, the wind direction plate 220 has a bent portion 220a at its lower end. The bent portion 220 is
It is configured by bending the lower end of the wind direction plate 220 toward the leeward side with respect to the wind sent from the air passage 42. Further, since the bent portion 220a is provided, the wind sent from the air passage 42 can be sent to the front of the filter 7f more reliably.

FIG. 13 shows a state in which the infrared sensor 7 is moved so as to rotate counterclockwise from the state shown in FIG. It should be noted that the infrared sensor 7 is indicated by X in FIG.
By rotating the direction rotating member 22 counterclockwise about the lower left end of the direction rotating member 22, the state shown in FIG.
The state changes to.

Referring to FIGS. 12 and 13, the wind direction plate 2
Since 20 is fixed to the infrared sensor 7, if the infrared sensor 7 moves, it moves accordingly. Then, since the wind direction plate 220 moves along with the movement of the infrared sensor 7, no matter where the infrared sensor 7 is moved, the wind sent from the air passage 42 is efficiently filtered by the infrared sensor 7. It is sent in front of 7f.

Further, particularly when the infrared sensor 7 does not detect the amount of infrared rays, the filter 7f and the detection hole 11 are provided.
It is preferable to provide a guard between the and. FIG. 14 shows, as a modified example of the microwave oven 1, one provided with such a guard.

With reference to FIG. 14, a stain prevention plate 41 is provided adjacent to the detection path member 40. The dirt prevention plate 41 has a detection path member 4 at the left and right ends of its upper end.
A connecting portion 41b for connecting to 0 is provided, and a cut-off portion 41a is provided at the center of the upper end in the left-right direction. In the present embodiment, the stain prevention plate 41 constitutes a plate body provided between the detection window of the infrared sensor at the retracted position and the detection hole of the heating chamber.

It should be noted that holes are appropriately formed in the portion of the stain prevention plate 41 above the air passage 42. That is, the stain prevention plate 41 is appropriately formed with holes so as not to obstruct the flow of air sent from the air passage 42.

In FIG. 14, the infrared sensor 7 has a heating chamber 10
The state of detecting the amount of infrared rays in the internal visual field,
That is, it shows a state in which the temperature is being detected. In this case, the cut-off portion 41a does not face the filter 7f and the detection window 7p (see FIG. 8). In addition, FIG.
In the state shown in, the cut-off portion 41a does not exist between the filter 7f and the detection window 7p and the detection hole 11.

FIG. 15 shows a state in which the infrared sensor 7 has been appropriately moved from the state shown in FIG. It should be noted that when the infrared sensor 7 does not detect the amount of infrared rays, the infrared sensor 7 shown in FIG.
The state shown in FIG.

In the state shown in FIG. 15, the lower half of the filter 7f and the detection window 7p (see FIG. 8) are cut-off portions 41.
It faces a. And in the state shown in FIG. 15, between the filter 7f and the detection window 7p, and the detection hole 11,
The cut-off portion 41a is present.

That is, in the present embodiment, when the infrared sensor 7 does not detect the amount of infrared rays, the cut-off portion 41
The a prevents the filter 7f from becoming dirty. However, when the infrared sensor 7 is detecting the amount of infrared rays, the infrared sensor 7 is moved so that the cut-off portion 41a is not included in its field of view, as shown in FIG. 14, for example.

Note that the infrared sensor 7 shown in FIGS. 12 and 13 also has a function as shown in FIG. 15 if the filter 7f and the detection window 7p are moved to a position where they do not face the detection hole 11. It is considered that the stain on 7f can be suppressed. That is, for the infrared sensor 7, the position shown in FIG. 15 is the retracted position. At the position shown in FIG. 15, at least a part of the detection window 7p of the infrared sensor 7 has a normal line with the detection hole 11p.
It does not intersect with. Further, at the position shown in FIG. 15, the normal line of the detection hole 11 does not intersect the detection window 7p and the filter 7f. Therefore, at the position shown in FIG. 15, at least part of the detection window 7p does not face the detection hole 11.

When the antifouling plate 41 is provided, as shown in FIG. 15, the upper end of the filter 7f is in contact with the dashed-dotted line T, or is located below the dashed-dotted line T. More surely by being moved to
It is possible to prevent the filter 7f from becoming dirty. The dashed-dotted line T is an extension line of the plane (FIG. 15 shows the side surface of the cut-off portion 41a) forming the cut-off portion 41a.

Next, the arrangement of the wiring 7b of the infrared sensor 7 in the microwave oven 1 will be described with reference to FIG.

The microwave oven 1 is provided with a partition plate 29 inside the exterior portion 4 for preventing a large number of wires extending from the back surface of the operation panel 6 from being spread. The right end of the partition plate 29 is brought into contact with the exterior portion 4 and a recess 29a is formed.

The wiring 7 extending from the infrared sensor 7
b is passed through a hole formed by the recess 29a and the exterior portion 4. As a result, the wiring 7b which is shielded by the ferrite or the metal braid and loses flexibility,
Its position can be restricted without binding. Therefore, it is possible to avoid a situation in which the smooth operation of the infrared sensor 7 is hindered by binding the wiring 7b. Although the wiring 7b is passed through the hole formed by the recess 29a and the exterior portion 4, a predetermined hole may be formed in the partition plate 29 and passed through the hole.

The area of the hole formed by the recess 29a and the exterior portion 4 is preferably large enough to allow the wiring 7b to freely move, as shown in FIG. This is because it is possible to freely move the wiring 7b and limit its existing range.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[Brief description of drawings]

FIG. 1 is a perspective view of a microwave oven according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a door of the microwave oven shown in FIG. 1 is opened.

3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 is a perspective view of the microwave oven of FIG. 1 with an exterior part removed.

5 is a cross-sectional view taken along the line VV of the microwave oven of FIG.

6 is an X set on the heating chamber of the microwave oven of FIG.
It is a figure which shows an axis and a Y-axis typically.

FIG. 7 is a control block diagram of the microwave oven of FIG.

8 is an exploded perspective view of the infrared sensor of the microwave oven of FIG.

9 is a diagram schematically showing a positional relationship between the reflecting mirror unit and the filter shown in FIG.

10 is a diagram schematically showing a positional relationship between a reflecting mirror unit and a filter in the infrared sensor of the conventional microwave oven shown in FIG.

FIG. 11 is a diagram schematically showing a state in which a filter is fitted in an outlet of a reflecting mirror unit in an infrared sensor as a comparison with the present invention.

FIG. 12 is a side view of the vicinity of the infrared sensor inside the exterior portion of the microwave oven of FIG.

FIG. 13 is a side view of the vicinity of the infrared sensor inside the exterior portion of the microwave oven of FIG.

FIG. 14 is a diagram showing a modification of the microwave oven of the present embodiment.

FIG. 15 is a diagram showing a modification of the microwave oven of the present embodiment.

16 is a diagram for explaining the wiring arrangement of the infrared sensor in the microwave oven of FIG.

FIG. 17 is an exploded perspective view of an infrared sensor in a conventional microwave oven.

[Explanation of symbols]

1 microwave oven, 6 operation panel, 7 infrared sensor,
7a infrared ray receiving element, 7b wiring, 7e reflecting mirror unit, 7f filter, 7m inlet, 7p detection window, 1
0 heating chamber, 11 detection window, 12 magnetron, 22
X-direction rotation member, 23 X-direction rotation motor, 24 Y
Direction rotation member, 25 Y direction rotation motor, 29 partition plate, 29a recess, 30 control circuit, 40 detection path member, 41 stain prevention plate.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Hyodo 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Hiroyuki Uehashi 2-5 Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd. (72) Inventor Takumi Kawabata 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-6-265152 (JP, A) Kaihei 7-98123 (JP, A) JP 10-172075 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24C 7/02 330

Claims (2)

(57) [Claims] 1. A heating chamber for containing food and forming a hole ,
A detection path member connected to the hole and having a visual field, emitted from food in the heating chamber, and the infrared ray in the visual field is detected.
An infrared sensor for detecting temperature detecting via path member, and a moving means for moving the infrared sensor, the test
A microwave oven including a dirt prevention plate for preventing dirt of the infrared sensor provided adjacent to the exit path member , wherein the infrared sensor has an infrared light receiving element for receiving the infrared light, and the infrared light receiving element An outer case is covered with an enclosing case, and a detection window for introducing infrared rays in the field of view is provided in the case, and a detection path member of the heating chamber detects the infrared sensor.
Infrared rays in the heating chamber are applied to the portion facing the window.
A detection hole for sending to the line sensor is formed, and the moving means does not have the stain prevention plate between the detection window of the infrared sensor and the detection hole, and prevents the stain in the visual field of the infrared sensor. From the state in which the plate is not included, the stain prevention plate is present between the detection window and the detection hole, and the stain prevention plate is included in the field of view of the infrared sensor, and at least a part of the detection window. Is capable of moving the infrared sensor to a standby position that does not face the detection hole, and the moving means, when the infrared sensor is performing infrared detection, the stain prevention plate in the field of view of the infrared sensor. The infrared sensor is moved so as not to be included, and when the infrared sensor is not performing infrared detection, the infrared sensor is moved to the standby position,
microwave. 2. A heating chamber for accommodating food and forming a hole ,
A detection path member connected to the hole and having a visual field, emitted from food in the heating chamber, and the infrared ray in the visual field is detected.
An infrared sensor for detecting temperature detecting via path member, and a moving means for moving the infrared sensor, the test
A microwave oven including a stain prevention plate for preventing contamination of the infrared sensor provided adjacent to the exit path member , wherein the infrared sensor is a board on which an infrared light receiving element for receiving the infrared rays is mounted, and a board of the board. the infrared and connected to the top of the light receiving element, comprising: a reflector unit having a feed port for condensing the infrared light receiving element by introducing the infrared therein and a filter fitted into the inlet port, said The detection path member of the heating chamber is the fiber of the infrared sensor.
The infrared rays in the heating chamber to the part facing the
A detection hole for sending to the outside line sensor is formed, and the moving means does not have the stain prevention plate between the filter of the infrared sensor and the detection hole, and the stain prevention plate is in the visual field of the infrared sensor. Is not included,
The dirt prevention plate is present between the filter and the detection hole, the dirt prevention plate is included in the field of view of the infrared sensor, and at least a part of the filter does not face the detection hole until a standby position. The infrared sensor is movable, and the moving means moves the infrared sensor so that the stain prevention plate is not included in the field of view of the infrared sensor when the infrared sensor is performing infrared detection. Further, when the infrared sensor is not performing infrared detection, the infrared sensor is moved to the standby position,
microwave.