JP2022167075A - Semiconductor oscillation microwave oven - Google Patents

Abstract

To disclose a microwave oven capable of precisely heating a heated object utilizing features of a semiconductor oscillator.SOLUTION: On a bottom face of a heating chamber 2, for example, five antennas 9a-9e, for example, are disposed in a petal pattern. Temperature sensors 12 capable of detecting temperatures while the entire heating chamber 2 is divided into areas as many as the sensors are disposed on a top face of a casing 1. The temperature of an entire heated object W is raised while temperature nonuniformity is reduced by repeating steps of detecting a shape, a mass and the temperature nonuniformity of the heated object W in first heating (initial step), and detecting the temperature again after driving only the antennas 9a-9e in locations of low temperatures. Thus, the heated object W can be equally heated to a target temperature.SELECTED DRAWING: Figure 7

Description

The present invention relates to a microwave oven using a semiconductor for microwave oscillation.

Magnetrons are generally used as means for generating microwaves in microwave ovens. In addition, there are problems such as the problem of bulkiness, the problem that a waveguide, a turntable or an antenna is required to improve the heating performance, and the problem that the structure is complicated, and the life is short.

Therefore, microwave ovens using semiconductor oscillators are attracting attention, but in conventional semiconductor oscillation microwave ovens, it is possible to uniformly heat the object to an appropriate temperature due to differences in the material, shape, weight, etc. of the object to be heated. I had a difficult problem. In other words, there are differences in the irradiation state of radio waves and the state of the object to be heated (quality, shape, weight, etc.) depending on the location of the object to be heated. It was impossible to heat evenly. For this reason, a phenomenon may occur in which a portion of the object to be heated is overheated while the other portion is insufficiently heated.

As a means of solving this problem, a method of providing a plurality of antennas and irradiating microwaves at the same time is also being studied. Examples thereof are disclosed in Patent Documents 1 and 2.

In Patent Document 1, the heating part is specified by detecting the color of the container with a color sensor, etc. Therefore, it can be said that the heating can be performed in a well-balanced manner, for example, the salad in the lunch box is not heated. On the other hand, Patent Document 2 addresses the problem of preventing backflow of microwaves from a plurality of oscillating antennas, and therefore it can be said that microwaves are simultaneously oscillated from a plurality of oscillating antennas. Also, Patent Document 1 is understood to simultaneously drive a plurality of oscillating antennas.

Japanese Patent No. 6486669 JP 2020-155275 A

Semiconductor microwave oscillators have advantages such as high directivity, stable frequency, light weight, long service life, and easy output change. When the antennas are driven at the same time, the microwaves oscillated from each antenna interfere with each other, as discussed in Patent Document 2, which often leads to a decrease in the output of the oscillation element and a decrease in uniformity. difficult to do Therefore, it is very difficult to put it into practical use.

The present invention was made against the background of such a situation, and intends to disclose a microwave oven excellent in quality and practicality while effectively utilizing the advantages of the oscillation system using a semiconductor element. .

The present invention includes various configurations, which are specified in each claim. Among these, the semiconductor oscillation microwave oven of the invention of claim 1 is
"A plurality of microwave oscillation antennas made of semiconductors are arranged horizontally apart on the lower or upper surface of a heating chamber equipped with a door,
Each of the microwave oscillation antennas is not driven simultaneously, but driven one by one.”
It is configured.

The invention of claim 2 is, in claim 1,
"Furthermore, a temperature sensor is provided to detect the surface temperature of the object to be heated placed in the heating chamber at a plurality of locations, and when it is determined that the object to be heated has temperature unevenness, the temperature sensor Based on the obtained temperature, each of the microwave oscillation antennas is driven so as to raise the temperature to a preset temperature while correcting the temperature unevenness.”
It is configured. An infrared sensor, a thermoviewer, or the like can be used as the temperature sensor.

The invention of claim 3 is, in claim 2,
"While at least four microwave oscillation antennas are arranged,
The temperature sensor is capable of detecting temperatures by dividing the object to be heated into a large number of areas,
When it is determined that the object to be heated has temperature unevenness, the microwave oscillation antenna positioned at a location with a low temperature is driven once or a plurality of times, so that the entire object to be heated reaches a predetermined temperature without unevenness. It is controlled to raise the temperature.”
It is configured.

The invention of claim 4 is, in claim 2 or 3,
"First, after driving one or more microwave oscillation antennas for a predetermined time, the temperature of the object to be heated is detected, and if it is determined that there is temperature unevenness based on the detection result, each microwave oscillation antenna is controlled to determine the driving order of
It is configured.

According to the invention of claim 5, in any one of claims 2 to 4,
"Each of the microwave oscillation antennas can select a plurality of outputs and driving times, and a combination of the driving order, the output and the driving time of each of the microwave oscillation antennas is used to reduce the temperature unevenness of the object to be heated. controlled by
It is configured.

The invention of claim 6 is, in claim 4 or 5,
“We created a plurality of reference maps in which the output, drive time, and drive sequence of each microwave oscillation antenna were set in correspondence with a plurality of reference patterns with different temperature variations. If it is the same as or similar to that reference pattern, each microwave oscillation antenna is driven based on the reference map corresponding to that reference pattern."
It is configured.

According to the invention of claim 7, in any one of claims 1 to 6,
"Part of the object to be heated is controlled not to heat"
It is configured.

According to the invention of claim 8, in any one of claims 1 to 7,
"There is an operation part that can select the heating area on the operation panel"
It is configured.

In the present invention, since a plurality of microwave oscillation antennas are not driven at the same time, there is no problem of mutual interference between microwaves. Therefore, stable heating can be achieved by preventing oscillation from becoming unstable. In addition, since the microwave oscillation antennas are driven individually, interference can be eliminated, heating efficiency can be improved, and heating time can be shortened. Furthermore, since only one of the plurality of antennas is driven, one semiconductor oscillator (oscillating element) is sufficient. Therefore, the cost can be suppressed and the weight and size can be reduced.

In the second and subsequent claims, the method of controlling each microwave oscillation antenna is specified. There are various types of objects to be heated, and the way heat passes is infinitely different. Since the wave oscillation antenna is controlled, it is possible to uniformly heat (heat) various objects of different types to the target temperature.

In particular, as in claim 3, when four or more microwave oscillation antennas are arranged and the temperature is detected by dividing the object to be heated into a large number of areas (grids, addresses), the object to be heated can be determined and finely heated. It is suitable to be able to

As described above, there are various types of objects to be heated, and the way heat is transmitted differs depending on how the object to be heated is placed in the heating chamber. Therefore, it is preferable to have a method that can uniformly heat the object to be heated even if the object to be heated is different in type or placement. In this respect, if the configuration of claim 4 is adopted, the temperature unevenness generated in the object to be heated by the initial heating is used as a reference, and the object to be heated is heated so as to eliminate the unevenness, so any kind of object to be heated can be handled. .

As mentioned above, one of the features of the semiconductor microwave is that the output is easy to adjust. In claim 5, this feature is used to shorten the heating time and promote uniform temperature can contribute to In addition, if the output and the time are adjusted individually, the control becomes troublesome. However, in claim 5, the output and the drive time (heating time) can be set to a plurality of values, and any value can be selected and driven. Therefore, the control becomes easier.

In addition, since the way heat travels differs depending on the object to be heated, the heating temperature per unit time/unit output is stored in the relationship between the unit time (for example, 10 seconds or 15 seconds) and the output. It is also possible and preferable to control the drive time and output of each microwave oscillation antenna (that is, feedback control).

As a mode of controlling each microwave oscillation antenna, it is possible to set the output, driving time and driving order of each microwave oscillation antenna based on the temperature of the object to be heated. If patterns are prepared and a pattern that matches the temperature unevenness after the initial process is selected for control, there is an advantage that the control method can be simplified.

Although there are times when it is desired not to heat a portion of the object to be heated, such as a lunch box with salad or pickled vegetables, this need can be met by adopting the configuration of claim 7. In this case, as means for specifying the range not to be heated, a color sensor may be provided as in Patent Document 1 to specify the non-heated part from the color (green, yellow), for example, a video or image of the object to be heated You may specify a non-heating part from. In the semiconductor oscillation microwave oven of claim 8, heating can be performed according to the user's preference.

The intensity of microwaves is proportional to the output, but if the frequency (wavelength) changes, the reflection of microwaves in the heating chamber and the permeability of the object to be heated change. By doing so, it is possible to change the area that is in the same heating state. In this application, since the frequency (wavelength) of the semiconductor oscillator can be changed within the legal range (2400 to 2500 Hz), by changing the frequency according to the size, arrangement and shape of the object to be heated, the micro An object to be heated can be efficiently heated by suppressing wave loss. Therefore, it can contribute to uniform heating and shortening of the heating time.

Specifically, we verified by experiments how the heating area changes depending on the relationship between the size of the object to be heated and the frequency. The optimal frequency can be selected by patterning the relationship between the temperature distribution of the object and the frequency. Alternatively, if the temperature rise after initial heating at the reference frequency is not as expected, it is also possible to select the optimum frequency by increasing or decreasing the frequency and confirming the degree of temperature rise. is. It is also possible to have a self-learning function that adds maps or modifies existing maps based on actual data acquired in this way.

Although it is possible to adjust the frequency steplessly within the legal range, in reality, it is possible to deal with about three options of 2400 Hz, 2450 Hz, and 2500 Hz, and the control circuit can be simplified.

1 is a perspective view showing an example of the appearance of an embodiment of a semiconductor oscillation microwave oven; FIG. 1 is a rough cross-sectional plan view of a semiconductor oscillation microwave oven; FIG. FIG. 3 is a longitudinal sectional view taken along line III-III of FIG. 2; It is a table of specifications of microwave oscillation antennas. (A) is a diagram showing an example of a temperature detection area, and (B) is a diagram showing an example of a first heating state (initial step). It is a figure which shows the basic aspect of control. It is a figure which shows a more concrete control aspect, (A) is a figure which shows 1st temperature distribution, (B) is a figure which shows a 2nd heating state. (A) is a diagram showing a second temperature distribution, and (B) is a diagram showing a third heating state. It is a plane sectional view of a 2nd embodiment. It is a plane sectional view of a 3rd embodiment. It is a plane sectional view of a 4th embodiment. It is a plane sectional view of a 5th embodiment.

(1). Structure of First Embodiment Next, an embodiment of the present invention will be described based on the drawings. First, a first embodiment (basic embodiment) shown in FIGS. 1 to 8 will be described. The basic structure of the microwave oven is the same as that of the conventional microwave oven. As shown in FIG. A horizontally rotating door 3 for opening and closing the heating chamber 2 is provided.

An operation unit 4 is provided on the front surface of the right side of the housing 1 . The left side of the door 3 is connected to the housing 1 via a hinge. The handle 5 is gate-shaped and protrudes forward. As briefly shown in FIG. 2, the right side of the housing 1 is formed with an electrical equipment chamber 6 in which electrical components are arranged and a heat radiating portion is provided. A flat table 7 is fixed to the bottom surface of the heating chamber 2 to protect the antennas 9a to 9b and to put the object W to be heated thereon.

The housing 1 has a double structure except for the rear surface, and five first to fifth antennas 9a to 9e for oscillating microwaves are arranged in the lower hollow portion 8. As shown in FIG. One of the five antennas 9a to 9e is positioned in the center of the heating chamber 2 and the other four are arranged in the corners of the heating chamber 2. FIG. Therefore, five antennas 9a-9e are arranged in a petal shape.

Of the five antennas 9a to 9e, the one located in the center is the first antenna 9a, the one located at the back left in FIG. The one located on the left side is called the fourth antenna 9d, and the one located on the left front side is called the fifth antenna 9e.

The intensity of the microwaves emitted from each of the antennas 9a to 9e decreases in proportion to the distance. , the range where the microwave is weak is indicated by a dashed line (in FIGS. 4B to 7, the strong excitation area is indicated by a dotted line). Of course, since the intensity of microwaves decreases continuously in inverse proportion to the distance, the expression "strong" or "weak" is not necessarily appropriate. However, it can be understood from FIG. 2 that almost the entire heating chamber 2 can be irradiated with strong microwaves.

A semiconductor oscillator (oscillating element), a power supply circuit, a control circuit, and the like (none of which are shown) are arranged in the electrical equipment chamber 6 of the housing 1 . The control circuit includes a volatile memory, a nonvolatile memory, a CPU, and the like. Since only one of the five antennas 9a to 9e is driven in this embodiment, only one semiconductor oscillator (oscillation element) is sufficient. Microwaves are transmitted to each of the antennas 9a to 9e from an oscillation element via a changeover switch.

The table in FIG. 4A shows the specifications of each of the antennas 9a to 9e. In this example, each of the antennas 9a to 9e can switch the frequency in three steps of 2400MHz, 2450MHz and 2500MHz, and the output can be selected in three steps of 100W, 200W and 300W. Also, the oscillation time can be set in units of 0 seconds (no oscillation), 10 seconds, and 15 seconds, respectively, but other units such as 20 seconds can be selected, and any time can be selected. It is also possible to

Since there are five antennas 9a to 9e, it is possible to select 3125 types of oscillation order, 243 types of frequency, 243 types of output, and 0 second of oscillation time. , 243 types of selection are possible. Furthermore, the combination of the four elements of oscillation order, frequency, output and oscillation time will be enormous, but we organized patterns that are likely to be used based on the standard type and size of the object to be heated, Create a plurality of reference patterns.

An infrared-type temperature sensor 12 is arranged in a central portion of the upper hollow portion 11 of the housing 1 in a plan view. The temperature sensor 12 divides the heating chamber 2 into a number of areas and measures the temperature of each area. That is, in the present embodiment, as shown in FIG. 4B, the heating chamber 2 is divided into 5×5=25 unit areas E1 to E25, and the temperature is measured for each unit area E1 to E25. .

In this case, the average value of the entire unit areas E1 to E25 may be taken and specified as the temperature of the unit areas E1 to E25. The temperature (point temperature) at the central portion of the areas E1 to E25 may be specified as the temperature of the unit areas E1 to E25. Also, as a method of specifying the temperature, it is possible to adopt the actual measured values such as 34 ° C. and 46 ° C. as the basis of control as they are. It is also possible to specify and control on a temperature range basis.

Note that the temperature sensors 12 can also be arranged at a plurality of locations. A monitor, touch buttons, and the like are arranged on the front surface of the operation unit 4, and these are unitized into one or a plurality of units.

(2). First Control Example FIGS. 5B to 8 show control examples. These examples are for heating (warming) the object W to be heated, and the target value (surface temperature of the object W to be heated) is set at 85 to 90° C., for example. Further, as a mode of temperature detection, the average value of each area is used as a reference for individual unit areas E1 to E25.

The control mode of the vibrating microwave oven of this embodiment is roughly divided into a method of heating based on a control pattern prepared in advance and a method of setting the heating mode each time based on the temperature distribution of the object W to be heated. (There is also a compromise type of both), and FIG. 6 shows an example of the former method. Therefore, a large number of combinations of microwave power, frequency and heating time from the plurality of antennas 9a to 9e are stored in the memory of the controller.

In FIG. 6, H indicates high heat treatment (for example, irradiation at 300 W for 15 seconds), M indicates medium heat treatment (for example, irradiation at 200 W for 15 seconds), and L indicates low heat treatment (for example, irradiation at 100 W for 15 seconds). The two-digit number is the detected temperature (temperature range) of the object W to be heated.

In FIG. 6, first, as shown in (A), the entire heating chamber 2 is uniformly and strongly heated. Specifically, the antennas 9a to 9e are sequentially driven to heat the entire heating chamber 2 at substantially the same intensity. That is, in the initial step (first heating step, first heating cycle), the entire heating chamber 2 is uniformly and strongly heated (excited).

If the object to be heated W is homogeneous as a whole, the degree of temperature rise will also be uniform. It is rarely heated to Therefore, the antennas 9a to 9e detect how the temperature of each part actually rises for each cycle of heating by the temperature sensor 12, and if there is temperature unevenness in each area, the temperature unevenness is reduced. Select a heating pattern to heat the next cycle.

By repeating this cycle, the temperature difference between the objects to be heated is reduced, and the temperature of the object to be heated W can be raised uniformly. Therefore, in this control example, the temperature of the object W to be heated is measured for each heating cycle, and the heating pattern for the next cycle is selected based on the temperature unevenness.

For example, as a temperature rise state after the initial process, as shown in (B), the temperature of the first and twenty-fifth areas is 45° C., and the , 22 are at 20° C., and the other portions are at 30 or 35° C., causing temperature unevenness. The pattern (C) closest to the temperature distribution of (B) is selected, and the second heat treatment is performed with the heating pattern of (C).

Then, the inside of the heating chamber 2 has the temperature distribution of (D), so the heating pattern (E) closest to the temperature distribution of (D) is selected from the memory, and the third heating process is performed ( Execute with the heating pattern of E). Furthermore, the sound and distribution after the heating of (E) are detected as (F), the pattern (G) closest to (F) is selected, the fourth heating is performed, and the target temperature of (H) to reach This completes the heat treatment.

Although four heat treatments are performed in FIG. 6, the number of heat treatments naturally varies depending on the degree of temperature unevenness and the target temperature. If no temperature unevenness is found in the temperature detection after the initial process, uniform heating should be continued while the temperature is detected by the temperature sensor, and driving should be stopped when the target temperature is reached.

(3). Second Control Example FIGS. 7 and 8 show an example of a method of setting the heating mode each time based on the temperature distribution of the object W to be heated. In this example as well, the object W to be heated is preheated as an initial step. In this case, the five antennas 9a to 9e may be sequentially driven, or as shown by shading in FIG. 25 seconds (15 seconds + 10 seconds)).

FIG. 7A shows the temperature distribution after the initial step (first heating step). Since almost no resistance is generated at a location away from the object W to be heated, the temperature hardly rises, and the temperature rises at the location of the object W to be heated. Therefore, when the temperature is low in the outer peripheral portion of the heating chamber 2, it can be determined that the object to be heated W does not exist in the low temperature region, and the control can proceed. That is, the shape of the object W to be heated can be detected from the temperature unevenness, and the approximate mass of the object W to be heated can be detected from the relationship between the irradiation energy of the microwave and the degree of temperature rise.

The degree of temperature rise at the location of the object W to be heated varies depending on the content, material, shape, etc. of the object W to be heated. For example, if there are a lot of contents and ingredients such as Makunouchi Bento, the temperature unevenness is large, and if the number of contents is small and the contents are spread almost evenly in the container, such as curry or fried noodles, the temperature unevenness is large. It can be said that there are few. Also, in the case of a high-density content such as a chunk of meat, the degree of temperature rise is low, and in the case of a low-density content such as tofu, the temperature rises easily.

Therefore, the antennas 9a to 9e are driven one by one so as to reduce the temperature unevenness. In FIG. 7B, the fourth antenna 9d is driven at, for example, 300 W for 15 seconds as a first heating step for heating while reducing the temperature unevenness in FIG. The temperature distribution of changes as shown in FIG. 8A, and the temperature unevenness of the object to be heated W is reduced while the temperature of the object to be heated W is generally increased. Therefore, as the second heating step, the second antenna 9b is driven at 300 W for 15 seconds, for example, as indicated by shading in FIG. 8(B).

Although the temperature distribution in the heating chamber 2 after the second heating stage is not shown, the temperature unevenness is smaller than that in FIG. By driving the antennas 9a to 9e one by one in this manner, the entire object to be heated W is raised to a predetermined temperature (target temperature).

When the temperature unevenness of the object W to be heated is reduced to a certain extent (for example, within 10° C.), the antennas 9a to 9e can be sequentially driven and heated. For example, it can be driven clockwise or counterclockwise from the upper end of FIG. 8(A). It is also possible to drive diagonally. For example, the order is first antenna 9a→fourth antenna 9d→five antenna 9e→third antenna 9c.

In any case, when the temperature rise is weak in the central portion of the heating chamber 2, the first antenna 9 may be driven appropriately. That is, when the temperature unevenness increases while heating is performed in the basic pattern, correction may be made by, for example, intensively driving the antennas 9a to 9e corresponding to low temperature locations.

When driving the antennas 9a to 9e, it is possible to equalize the temperature rise by combining the output power, the irradiation time and the frequency. The order of heating and selection of output and time should be set based on a map prepared by experiment. In the intermediate stage of heating, if the predicted temperature differs from the actually increased temperature, feedback control that corrects the map can be employed.

The degree of temperature unevenness of the object W to be heated also greatly differs depending on the size (flat area) of the object W to be heated. For example, when the object to be heated W is of a size that fits in the strong irradiation area of the first antenna 9a, it is understood that there is almost no temperature unevenness, so in this case only the first antenna 9a is driven continuously. can be heated. Such continued use of only one antenna 9a-9e is also included in the present invention.

A feature of the semiconductor type microwave exciter is that the frequency can be easily controlled. In the present embodiment, this feature can be used to change the frequency in three steps. Therefore, the object W to be heated can be efficiently irradiated with the microwave by switching the frequency according to the size and shape of the object W to be heated and adjusting the range in which the microwave is strongly irradiated. It is also possible to select an arbitrary numerical value for the frequency within the legal range.

(4). Other Embodiments In the second embodiment shown in FIG. 9, nine antennas 13a to 13i are provided in three rows each in the frontage direction and the depth direction. That is, in the state shown in FIG. 8, the antennas are numbered 13a, 13b, 13c from left to right and toward the front. Briefly, the antennas 13a to 13i are arranged in three rows of three.

Using a large number of antennas 13a to 13i as in the embodiment of FIG. 9 has the advantage of being able to achieve fine heating because the area covered by strong microwaves can be extended to the entire heating chamber 2. FIG. Furthermore, in the embodiment of FIG. 9, there are many common areas 14 where the strong excitation area areas of the adjacent antennas 13a to 13i overlap, and when the adjacent antennas 13a to 13i are driven, these common areas 14 are used. pinpoint heating becomes possible. This aspect also contributes to the realization of a fine heating mode.

Increasing the number of antennas may promote uniform heating, but at a higher cost. In addition, it can be said that there are many requests to uniformly heat, heat, and defrost the entire object W to be heated. Therefore, it is realistic to have a structure that can heat uniformly while reducing the number of antennas as much as possible.

From such a realistic point of view, in the third embodiment shown in FIG. 10, as a modification of the first embodiment in which five antennas 9a to 9e are used, five antennas are arranged in a petal shape. The antennas 9a to 9e are arranged close to each other. In other words, the normal object to be heated W is usually much smaller than the plane area of the heating chamber 2, and it can be said that there is no situation in which the entire heating chamber 2 must be strongly heated. In arranging the five antennas 9a to 9e on the petals as in the form, the second to fifth antennas 9b to 9e are closer to the center than in the case of the first embodiment.

In this embodiment, it can be said that the object W to be heated can be evenly heated by using a basic drive pattern in which the second to fifth antennas 9b to 9e are sequentially driven in the circumferential direction or the diagonal direction. Of course, the first antenna 9a may be driven according to the degree of temperature rise of the object W to be heated. Further, as an initial step, it is also possible to drive the second to fifth antennas 9a to 9e, for example, for 10 seconds each to heat the object W as a whole. The form is also the same.).

The fourth embodiment shown in FIG. 11 also uses five antennas 9a to 9e as in the first embodiment. are moved to the back side, and the left and right intervals between the fourth and fifth antennas 9d and 9e are narrowed. Therefore, the strong oscillation areas of adjacent antennas 9a to 9e overlap each other.

In this fourth embodiment as well, it can be said that the area where the object to be heated W is placed is substantially covered by the strong oscillation area. In addition, in this embodiment, basically, three antennas 9a to 9e are arranged side by side on the back side, and two antennas 9a to 9e are arranged side by side on the front side, forming a front and rear two-row system. .

As a heating pattern, a lateral movement method such as the third antenna 9d→9e→second antenna 9b→first antenna 9a→third antenna 9c, or second antenna 9b→fourth antenna 9d→first antenna 9a→second antenna 9a is used. Various methods such as a zigzag method of 5 antennas 9e→3rd antenna 9c can be adopted. Based on the temperature distribution detected in the initial process, an optimum pattern for reducing temperature unevenness may be adopted.

In the fifth embodiment shown in FIG. 12, six antennas 15a to 15f are arranged in front and rear two rows. Also in this embodiment, since the strong excitation areas of the adjacent antennas 15a to 15f overlap each other, the object W to be heated can be determined and finely heated as quickly as possible.

Although the embodiments of the present invention have been described above, the present invention can be embodied in various structures and control modes. As for the structure, for example, the antenna can also be arranged in the upper space of the housing. Alternatively, it is also possible to arrange the antennas in both the upper space and the lower space.

It is also possible to adopt a structure in which the heating chamber is divided into multiple heating areas, and these areas are displayed as non-heating selection areas on the operation unit, and when a specific area is touched, that part is not heated (or the heating is weak). be. As for the degree of heating, it is also possible to provide selection buttons for "strongly heating" and "weakly heating" based on the non-touch standard. It is also possible to provide selection buttons for heating and thawing.

As a mode of control, after the initial heating process, by thermographically converting the difference in temperature inside the heating chamber with a temperature sensor, the shape and temperature unevenness of the object to be heated are read, and the temperature of the object to be heated is low. It is also possible to employ a method of repeating the process of intensively heating a portion. As already mentioned, the temperature of the outer part of the object to be heated hardly rises even if it is irradiated with microwaves. , and based on the shape (and mass) of the object to be heated thus grasped, the object to be heated can be efficiently irradiated with microwaves.

The present invention can be embodied in a semiconductor oscillator microwave oven. Therefore, it can be used industrially.

1 Case 2 Heating Chamber 3 Door 4 Operation Unit 6 Electrical Equipment Room 7 Flat Table 8 Lower Hollow Part 9a-9e Antenna 11 Upper Hollow Part 12 Temperature Sensor 13a-13i Antenna 14 Common Area Where Strong Excitation Areas Overlap 15a-15f Antenna E1 ~ E25 Temperature distribution unit area (address)

Claims (8)

A plurality of microwave oscillation antennas made of semiconductors are arranged horizontally apart on the lower surface or the upper surface of the heating chamber provided with the door,
A plurality of the microwave oscillation antennas are not driven simultaneously, but driven one by one.
Semiconductor oscillation microwave oven. Further, a temperature sensor is provided to detect the surface temperature of the object to be heated arranged in the heating chamber at a plurality of locations, and when it is determined that the object to be heated has temperature unevenness, the temperature sensor detects it. Based on the temperature, each of the microwave oscillation antennas is driven so as to raise the temperature to a preset temperature while correcting the temperature unevenness.
A semiconductor oscillation microwave oven transferred according to claim 1. While at least four microwave oscillation antennas are arranged,
The temperature sensor is capable of detecting temperatures by dividing the object to be heated into a large number of areas,
When it is determined that the object to be heated has temperature unevenness, the microwave oscillation antenna positioned at a location with a low temperature is driven once or a plurality of times, so that the entire object to be heated reaches a predetermined temperature without unevenness. controlled to raise the temperature,
The semiconductor oscillation microwave oven according to claim 2. First, one or more microwave oscillation antennas are driven for a predetermined period of time, and then the temperature of the object to be heated is detected. controlled to determine the driving order,
The semiconductor oscillation microwave oven according to claim 2 or 3. A plurality of outputs and driving times can be selected for each of the microwave oscillation antennas, and the driving order, output and driving time of each of the microwave oscillation antennas are combined to reduce unevenness in temperature of the object to be heated. controlled,
A semiconductor oscillation microwave oven according to any one of claims 2 to 4. A plurality of reference maps are created in which the output, drive time, and drive sequence of each microwave oscillation antenna are set corresponding to a plurality of reference patterns with different temperature unevenness. If it is the same as or similar to the reference pattern of, each microwave oscillation antenna is driven based on the reference map corresponding to the reference pattern,
The semiconductor oscillation microwave oven according to claim 4 or 5. A part of the object to be heated is controlled so as not to be heated,
A semiconductor oscillation microwave oven according to any one of claims 1 to 6. The operation panel has an operation part that can select the heating area,
A semiconductor oscillation microwave oven according to any one of claims 1 to 7.

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