TW410260B - Microwave oven - Google Patents

Abstract

The objective of the present invention is to improve heating efficiency, eliminate heating unevenness, and simplify the structure of a microwave oven. To achieve the objective, a rotary disc 9 provided on the bottom of a heating chamber 2 is provided with vertical bars 9b continuously expanding in one direction and horizontal bars 9c with a length of less than 1/2 of wavelength <lambda> of microwave, and square openings 9e. An optical sensor is provided so as to detect whether or not the rotary disc 9 is positioned at the reference position, and it can be stopped at a desired stopping position by controlling the energizing time of RT motor on the basis of its starting time. When 'heating rice' is selected, the rotary disc 9 turns by an angle A and stops there to be heated, and when 'heating sake' is selected, it turns by an angle B and stops there to be heated. The stopping position of the rotary disc 9 where the optimal electric boundary distribution can be obtained according to the kind of food is obtained experimentally in advance, and its result is stored.

Description

aim | 871074? No. 2 patent application, Chinese manual revision page% A7 'B7 September 1998, amended by the Ministry of Economic Affairs, Intellectual Property Bureau, Employee Consumer Cooperative, printed by V. Invention description (9), cooling valve device 6, the aforementioned control circuit 4 etc. Furthermore, in this embodiment, a heater 7 (only shown in FIG. 2) for heating the conditioner is provided in the patio portion of the heating chamber 2. The microwave oscillated from the magnetron 5 passes through a waveguide not shown in the figure, and then from the excitation port 8 (refer to FIG. 3, 4) provided on the right side of the furnace 1 in this case. (Figure) and is supplied into the heating chamber 2. Thereby, a microwave supply means composed of a magnetron 5 and a waveguide is constituted. As shown in FIG. 2, the magnetron 5, the cooling valve device 6, and the heater 7 are all controlled by the control circuit 4. Then, the bottom of the inside of the heating chamber 2 is treated with enamel on the surface of a conductive material such as a steel plate, as shown in Fig. 5, and a rotating plate 9 is formed in the shape of a circular disk. The shape of the rotating plate 9 will be described later. The center of the rotating plate 9 is connected to a rotating shaft 10 provided to penetrate the bottom surface of the heating chamber 2 (furnace 1). The rotating shaft 10 is an R T motor provided on the outer bottom surface side of the heating chamber 2. 1 1 (refer to Figure 2) Accordingly, the RT motor 11 and the rotating shaft 10 constitute a drive mechanism. The R T motor 11 is also controlled by the aforementioned control circuit 4. In addition, the rotating plate 9 is rotated at a certain speed in one direction (for example, clockwise from the top) by the driving of the R T motor 11. In addition, as shown in FIG. 3, FIG. 4, and FIG. 6, a partial cross section is shown, and a detachable heat-resistant glass or ceramic food placing tray (rotary disk) is formed on the upper surface of the rotating plate 9. 12 and place food on its food tray 12. Therefore, the rotating plate 9 is configured to support the food F via the food placing tray 12. In addition, the above-mentioned excitation port 8 is installed. Please read the notes on the back before filling in this page.) This paper size is applicable to China National Standard (CNS) A4 (210 x 297 mm). -12- Central Ministry of Economic Affairs Printed by the Bureau of Standardization, Shellfish Consumer Cooperative 410260 at B7 V. Description of the invention (彳) [Technical field to which the invention belongs] The present invention relates to a rotating plate provided with a support for food at the bottom of a heating chamber. A microwave oven for heating food in the heating chamber. 1 [Problems to be Solved by the Invention] In a microwave oven for microwave heating, there may be variations in the strength of the electric field (the amount of heating energy) in the heating chamber due to the standing wave of the microwave. Therefore, it will cause the disadvantage of low heating efficiency when heating smaller foods (such as 1 bowl of rice or a small amount of vegetables), and heating larger foods (such as several siu mai or pizza) that expand in a flat direction. A problem such as uneven heating occurs. 'In this case, it is generally carried out by rotating a food mounting plate (rotary plate) on which food is placed. Although the uneven heating in the circumferential direction can be suppressed, for example, when there is an excitation port on the side wall The heating in the central portion of the food loading tray will be weak, while the heating in the peripheral portion will be strong, etc., and uneven heating in the radial direction will still remain. Furthermore, it is not possible to improve uneven heating in the vertical direction in the case of scalding and the like. Furthermore, even when a small food is placed in the center of the food tray, the heating efficiency cannot be sufficiently high. Therefore, conventionally, in order to improve heating efficiency or improve heating unevenness, it has been considered to make several configuration schemes described below. However, there are certain disadvantages and the results are not very effective. In other words, taking the first precedent as an example, a movable element for adjusting impedance is set in the waveguide, and according to the state of the furnace (heating room), the paper size is adjusted to the Chinese National Standard (CNS) A4 (210X297) (Li)! — 丨 | _ip! (Please read the note on the back ^ K before filling out this page) Order-4- Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 410260 a? __B7 ___ V. Description of Invention (2) Furnace impedance to the maximum efficiency conditions of the magnetron to achieve high efficiency. However, in such a design, the impedance adjusting conductor provided in the waveguide will become the main factor for spark generation. However, if it is made to suppress the occurrence of spark +, the impedance adjustment effect will be reduced on the contrary. Disadvantages. Taking the second leading example as an example, it is considered that a movable excitation port is provided on the bottom surface of the heating chamber, and the movable excitation port is moved directly under the food to efficiently heat the food. However, in such a design, it is difficult to complicate the installation of the drive mechanism of the movable excitation port, and the practicality is not high. Taking the third precedent as an example, consider the configuration in which the food placing tray is rotated and moved up and down, and the heating distribution is improved by the up and down movement. However, in such a design, it is necessary to add a structure for driving the food loading tray up and down, and there is a disadvantage that the structure is complicated. In view of the above circumstances, the present invention aims to provide a microwave oven which can solve the problem with a simple structure and seek to improve the heating efficiency and improve the uneven heating situation. [Means to solve the problem] In a microwave oven, a food placing tray (rotary disk) composed of food directly or through a material that can be transmitted through radio waves is placed on the bottom of the heating chamber and made of conductive material. Composed of rotating plates. The microwave oven of the present invention focuses on the function of a rotating plate made of a conductive material as a radio wave reflector. The rotating plate is formed in a non-homogeneous shape in the direction of rotation. With its rotation, the standing wave is not only disordered into disorder, but From the change of the position (rotation angle) of the rotating plate, find out the different electric field distribution and even the heating distribution in the heating chamber. According to the paper size, use the Chinese National Standard (CNS) A4 grid (210X297 mm) ^^^ 1- ^^ ^ 1 ^^^ 1 ^^^ 1 He t ftttt fti ^ HI (Please read the notes on the back before filling out this page) Order-Slave-5- Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 410260 A7 B7 5 2. Description of the invention (3) A cost invention. In other words, the microwave oven of the present invention includes a heating chamber, a microwave supply means for supplying microwaves into the heating chamber, and a bottom provided in the heating chamber, which is made of a conductive material and is non-uniform in the direction of rotation. A rotating plate configured to support food, a driving mechanism for rotating the rotating plate, and a control means for controlling the stop position of the rotating plate in a manner to heat the food (described in item 1 of the scope of patent application) invention). Here, for example, for foods such as scalding, it is suitable to reduce the heating of the upper part and the heating of the lower part, so that heating unevenness does not occur in the vertical direction; for relatively small food such as 1 bowl of rice , It is suitable for the heating distribution in which the central part of the heating chamber is strongly heated. For several relatively large foods such as siumai which are distributed in the plane direction, it is suitable for the heating distribution method which is evenly distributed in the plane direction. There are suitable types of specified heating distributions or a combination of specified heating distributions for each type of food, such as its size or shape. According to the above configuration, if the stop position of the rotating plate is changed as described above, different heating distributions can be obtained in the heating chamber. However, by means of control, the stopping position of the rotating plate can be controlled in accordance with the way the food is heated. Therefore, it is possible to perform efficient heating in accordance with foods, and to achieve heating conditioning with good performance without heating unevenness. In addition, it can be realized only by controlling the rotating plate, so that the structure can be achieved without complicate the structure. In this case, as a mode of controlling the stopping position of the rotating plate by the control means, it can be responded to by user input or Automatically identified food This paper size applies Chinese National Standard (CNS) A4 (210X297 mm) (Please read the precautions on the back before filling this page)

410260 a? __B7 V. Description of the invention (4) Stop the rotating plate at the specified stop position (the invention described in item 2 of the patent application scope). In addition, depending on the type of food, a rotary heating mode for heating the food while rotating the rotary plate and a heating mode for stopping food by stopping the rotary plate at a designated stop position may be selected (the invention described in claim 3 of the patent application scope) . In addition, a method of heating the food in a state in which the rotating plate is stopped at a predetermined stop position according to the type of food, and a composite heating mode in which the rotating plate is heated while rotating the food is also possible ( Apply for the invention described in item 4. · According to these, there are more heating distribution modes and the variety of heating distribution modes that can be selected. Therefore, the selection range for heating according to the type of food is increased. ^ For the improvement of heating efficiency and improvement of uneven heating You can further improve the effect. '' Printed by Shelley Consumer Cooperative, Central Bureau of Standards, Ministry of Economic Affairs (please read the precautions on the back before filling this page). Next, set a stop position detection method that detects the stop position of the rotating plate so that the control method can be based on the stop position The detection result of the detection means is configured to control the stop position of the i-rotating plate (the invention described in item 5 of the scope of patent application). Thereby, even if several stop positions for stopping the rotary plate are set, the rotary plate can be reliably stopped at the designated stop position. At this time, the stop position detection means is configured to detect the reference position of the rotating plate, and the control means can stop the rotating plate at a specified stop position based on the rotation driving time set from the reference position y of the rotating plate. (The invention described in item 6 of the scope of patent application). In this way, the paper size for detecting the stop position of the rotating plate and controlling the stop position can be easily completed. Applicable to China National Standards (CNS &gt; A4 size (210 X 2.97 mm)). 410260 B7 V. Description of the invention (5)

I constitute. Furthermore, in this case, the stop position detection means (the invention described in item 7 of the patent application scope) can be formed by a light sensor, or the stop position detection means (the invention described in item 8 of the patent application scope) can be formed by a magnetic sensor. ) With this, a simple configuration can be used to detect the reference position. Alternatively, the angle of the rotation axis that rotates the rotation plate by detecting the rotation direction position connected to the rotation plate specified by the rotation plate can be used to indirectly detect the rotation plate. The stop position constitutes a stop position detection means (the invention described in item 9 of the scope of patent application). Thereby, a mechanism for detecting the stop position of the rotating plate can be provided outside the heating chamber. In addition, even if the heating distribution in the heating chamber can be made suitable for food in the manner described above, especially for smaller foods, the effect of the heating distribution cannot be fully obtained if the food is not in an appropriate position. Here, if a mark indicating a position suitable for placing food is formed on the rotating plate or a food placing tray provided on the rotating plate (the invention contained in item 10 of the scope of patent application), the user The food can be placed at a position where the effect of heating distribution can be sufficiently obtained. At this time, if the display mark is performed by the illumination of an illumination lamp (the invention described in the item 11 of the patent application scope), the label can be easily understood and prominent. However, by changing the stopping position of the rotating plate as described above, in order to obtain different electric field distributions and heating distributions in the heating chamber, the formation of the rotating plate is important. In particular, by making a suitable shape, the variation of the electric field distribution can be increased with the change of the stop position of the rotary plate, in other words, the pattern of the heating distribution can be increased. Of course, the original paper used as a rotating plate must meet the U.S. Standard for Family Care (CNS &gt; A4 Waki (2 pulses 297 mm) — ~ V- (Please read the precautions on the back before filling out this page) l · ^ 'Order' Printed by the Consumer Cooperatives of the Central Bureau of Quasi-Economic Bureau of the Ministry of Economic Affairs 410260 a? B7 V. Description of the invention (6) Function to support food directly or through a food tray. Here, the rotating plate can be formed in In the surrounding frame, there are grids of vertical rods and horizontal rods orthogonal to them. Among them, the vertical rods are made to extend continuously in one direction, and the horizontal rods are cut in a way that is less than 1/2 the length of the microwave wavelength. State structure (the invention described in claim 12 of the patent application). In this way, by irradiating microwaves to a rotating plate made of a conductive body, the wall current will spread along the grid portion, but the current will be rectified and oriented vertically. The rod is spread in one of the extending directions of the rod, and the distribution of the electric field is changed with the spreading direction, that is, the stop position of the rotating plate. Furthermore, the current becomes difficult to spread to the direction of the horizontal rod that is less than 1/2 of the microwave wavelength. Thus, with the rotation The variation of the stopping position of the plate can increase the variation of the electric field distribution. Alternatively, the rotating plate can be formed in a grid shape with vertical bars and horizontal bars perpendicular to the rotating frame, and the vertical and horizontal lengths of the rotating plate can be set at the center. A central opening of at least 1/4 the wavelength of the microwave (the invention described in item 13 of the patent application range). This allows the microwave to easily pass through the center of the rotating plate by using the central opening, so it is reflected to the heating The transmittance of the microwave at the bottom of the room toward the center of the rotating plate will increase. As a result, the food placed in the center of the rotating plate can be heated more strongly. In this case, it can be used to supply microwaves. The excitation port into the heating chamber is located on the side wall of the heating chamber, and the height from the rotating plate is less than 1/2 of the wavelength of the microwave (the invention described in claim 14 of the patent application range). The microwave supplied into the heating chamber easily enters between the rotating plate and the bottom surface of the heating chamber. At this time, if the wall portion connected to the lower end of the excitation port of the waveguide of the waveguide in the heating chamber is guided, Reed towards the scale of this paper applies China National Standard (CNS) A4 size (210X297 public widow) (please read the back of smell ^ • Notes items to fill out this page)

-Order. -9- 1 410260% V. Description of the invention (7) The shape of the magnetic port descending and sloping (the invention described in item 15 of the patent application scope) will cause the microwave supplied from the excitation port to the heating chamber to be affected. It is guided downward and can easily enter between the rotating plate and the bottom surface of the heating chamber. Furthermore, the bottom surface of the heating chamber may be formed into a mountain-shaped bulge corresponding to the center portion of the rotating plate (the invention described in item 16 of the scope of patent application). As a result, the microwave that has entered the bottom surface of the heating chamber is guided upward through the central portion of the rotary plate with the shape of the bulge, and the microwave penetration of the central portion of the rotary plate can be further promoted. Then, the opening formed by the grid of the rotating plate may be formed at a peripheral portion of the rotating plate to form a rectangular opening having a longitudinal direction of 1/2 or more of the microwave wavelength and a horizontal direction of less than 1/4 of the microwave wavelength. (The invention described in item 17 of the scope of patent application). Therefore, when the direction of the microwave crosses the long direction of the opening, the microwave can easily pass through, and when the direction of the microwave is consistent with the long direction of the opening, the microwave is difficult to pass through. As a result, the change in the electric field distribution can be increased in accordance with the change in the stop position of the rotating plate. Printed by the Consumers 'Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page)' In this case, the vertical rod of the grid of the rotating plate can be made from one end in the surrounding frame to the other end A continuous structure is applied in one direction (the invention described in claim 18 in the scope of the patent application). By using microwave irradiation, the wall current is transmitted along the vertical rods of the grid, so that it can follow the stop position of the rotating plate. The electric field distribution changes. Also | When the rotating plate is stopped at a specified stop position and the food is heated, a method of rotating the rotating plate 180 degrees and then stopping at least once may be configured (the invention described in claim 19 of the scope of patent application) The dimensions are applicable to the Chinese National Standard (CNS) A4 specification (210X2.97 mm) -10- A7 B7 410260 5. Description of the invention (Q). Thereby, even when the microwave irradiation from one side of the food is strong and the opposite side of the food can be said to be the backlight side, the food is reversed by 180 degrees during heating, which can equalize the double Microwave Irradiation [Embodiments of the Invention] Hereinafter, several embodiments of the present invention will be described with reference to the drawings. (1) First Binary Example First, the first embodiment of the present invention (with the items in the scope of patent applications 1, 2, 3, 4, 5, 6, 7, 1 and 12) will be described with reference to FIGS. 1 to 6. Corresponding). Figures 3 and 4 show the outline of the interior of the heating chamber of the microwave oven according to this embodiment. This microwave oven is provided with a rectangular box-shaped furnace 1 having an open front face in an outer box (not shown), and a heating chamber '2 is formed in the furnace 1. Although not shown in the figure, a door for opening and closing the heating chamber 2 is provided on the front of the outer box, and a user is provided with a selection of a food type (conditioning menu) and a setting of a conditioning time on a right side thereof. Operation panel 3 (only shown in FIG. 2) for instructions such as the start of conditioning. As shown in Fig. 2, the operation signal of the operation panel 3 is configured to be input to a control circuit 4 composed of a microcomputer or the like. Although not shown in detail, in the outer box, a machine room located on the right side of the furnace 1 is provided. The machine room is provided with a part that generates an oscillating microwave, as shown in FIG. 2. Magnetron 5 and its drive circuit This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) (谙 Please read the precautions on the back before filling this page) -Order · -Central Bureau of Standards, Ministry of Economic Affairs Printed by Industrial and Consumer Cooperatives -11-

aim | 871074? No. 2 patent application, Chinese manual revision page% A7 'B7 September 1998, amended by the Ministry of Economic Affairs, Intellectual Property Bureau, Employee Consumer Cooperative, printed by V. Invention description (9), cooling valve device 6, the aforementioned control circuit 4 etc. Furthermore, in this embodiment, a heater 7 (only shown in FIG. 2) for heating the conditioner is provided in the patio portion of the heating chamber 2. The microwave oscillated from the magnetron 5 passes through a waveguide not shown in the figure, and then from the excitation port 8 (refer to FIG. 3, 4) provided on the right side of the furnace 1 in this case. (Figure) and is supplied into the heating chamber 2. Thereby, a microwave supply means composed of a magnetron 5 and a waveguide is constituted. As shown in FIG. 2, the magnetron 5, the cooling valve device 6, and the heater 7 are all controlled by the control circuit 4. Then, the bottom of the inside of the heating chamber 2 is treated with enamel on the surface of a conductive material such as a steel plate, as shown in Fig. 5, and a rotating plate 9 is formed in the shape of a circular disk. The shape of the rotating plate 9 will be described later. The center of the rotating plate 9 is connected to a rotating shaft 10 provided to penetrate the bottom surface of the heating chamber 2 (furnace 1). The rotating shaft 10 is an R T motor provided on the outer bottom surface side of the heating chamber 2. 1 1 (refer to Figure 2) Accordingly, the RT motor 11 and the rotating shaft 10 constitute a drive mechanism. The R T motor 11 is also controlled by the aforementioned control circuit 4. In addition, the rotating plate 9 is rotated at a certain speed in one direction (for example, clockwise from the top) by the driving of the R T motor 11. In addition, as shown in FIG. 3, FIG. 4, and FIG. 6, a partial cross section is shown, and a detachable heat-resistant glass or ceramic food placing tray (rotary disk) is formed on the upper surface of the rotating plate 9. 12 and place food on its food tray 12. Therefore, the rotating plate 9 is configured to support the food F via the food placing tray 12. In addition, the above-mentioned excitation port 8 is set up. Please read the notes on the back before filling in this page.) This paper size applies to China National Standard (CNS) A4 (210 x 297 mm) -12- 410260 A7 ___B V. Description of the invention (10) The position of the 9-rotation plate is high. For example, when toasting for toast or the like is performed, the food tray 12 can be removed from the rotary plate 9 and the rotary plate 9 can be used as a barbed wire for grilled meat. Specifically, as shown in FIG. 5, the rotating plate 9 is tied in a ring-shaped peripheral frame 9 a, and is formed into a grid shape with a plurality of vertical rods 9 b and a plurality of horizontal rods 9 c that intersect with each other. Way of posing. Further, a convex portion 9 d connected to the rotation shaft 10 described above is provided at a center portion thereof. At this time, most of the vertical rods 9 b extend continuously in one direction (forward and backward directions in FIG. 5), and the left and right directions in FIG. 5 are arranged at equal intervals. On the other hand, most of the aforementioned horizontal rod 9c is set to a shape that is not cut to a length smaller than 1/2 of the microwave wavelength λ (about 12 mm). In this case, a plurality of long rectangular openings 9 e of approximately the same size are formed by the vertical rod 9 b and the horizontal rod 9 c in the front-rear direction in FIG. 5, and those openings 9 e are oriented toward The rectangular long directions are arranged side by side in the left and right directions in the figure in a form staggered by an average of a half distance. Incidentally, the longitudinal dimension of the aforementioned opening portion 9e is Λ / 2 or more, such as 64 mm; and the lateral dimension b is less than λ / 4, such as 3 mm. Because of this, the rotating plate 9 is formed into a heterogeneous shape in the direction of rotation. In this embodiment, the center point is made into a point-symmetrical shape (the same shape even if it is rotated 180 degrees). Then, as shown in Fig. 6, a light reflecting portion 13 is provided at a designated position of the peripheral frame 9a of the rotating plate 9. On the other hand, a reflection type light sensor 14 having both a light projecting portion 14 a and a light receiving portion 1 4 b is provided on the side wall portion of the heating chamber 2 as a reference for detecting the reference position of the rotating plate 9. Paper size applies to Chinese National Standard (CNS) A4 (2) 0 X 297 mm) &lt; Please read the precautions on the back before filling this page) -I l · I I --- Order --- ------ Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 410260 a? _; _B7 V. Description of Invention (κ) 11 Stop position detection means. In this embodiment, for example, where the extending direction of the vertical rod 9 b is consistent with the front-rear direction of the heating chamber 2 as the reference position of the rotating plate 9, the light reflecting portion 1 3 is provided when the rotating plate 9 stops. When it reaches the reference position, the light emitted from the light projection unit 1 4 a will be reflected by the light reflection unit 13 and then received by the light receiving unit 1 4 b. As shown in FIG. 2, the light sensor 1 4 The detection signal is generated so as to be input to the control circuit 4 described above. Secondly, the control circuit 4 controls the magnetron 5 or the RT motor 11 according to the input signal from the operation panel 3 to perform heating conditioning, but the details are described in the following description of the function. When the microwave oven is conditioning, it will use the The rotation of the rotating plate 9 is controlled in accordance with the heating of the type of food F (conditioning menu). Therefore, 'the control circuit 4 has a function ft as a control means. Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Consumer Cooperatives {Please read the notes on the back before filling out this page) At this time, when the specified food type ("hot rice" and "steamed wine") is selected in this embodiment , Will cause the rotating plate 9 to stop at a specified stop position (rotation angle 'degree) and then execute a stop heating mode for heating. At this time, the stop position at which the plurality of types of rotating plates 9 stop is set according to the type of food. More specifically, when the food type is "hot rice j," as shown in Fig. 4 (a), the rotation plate 9 is stopped from the reference position to the angle A position, and when the food type is "steamed wine" At this time, as shown in FIG. 4 (b), the rotation plate 9 is stopped from the reference position to the position of the angle B. Then, in order to stop the rotary plate 9 at an arbitrary position in this way, the control circuit .4 will advance the energizing time (T (A) and T (B)) necessary to rotate the rotary plate 9 only by the angle A and the angle B. Remembrance to RT motor This paper size applies Chinese national standard (CNS &gt; A4 specification (21 × 297 mm)) • 14- Printed by the Intellectual Property Bureau Employee Consumer Cooperative of the Ministry of Economic Affairs 410260 A7 B7 V. Description of invention (12) 1 1 In order to make the rotating plate 9 rotate continuously, from the time point when the reference position is detected by the light sensor 14 described above, the rotary RT motor 11 is driven only when it is energized and then stopped. In this embodiment, when the type of food is In the "defrosting condition", although the figure is not shown, the rotary plate 9 is advanced from the reference position only to the position of the angle C (to the time when the power-on time T (C) of the motor 11 is R), and then the heating is performed for a certain time. After that, the remaining heating time is set to execute a composite heating mode in which heating is performed while the rotating plate 9 is continuously rotated. Moreover, when a food type other than the above-specified food type is selected, an execution is performed to make the rotating plate 9 connect Rotary heating mode in which heating is continuously performed while rotating. Secondly, the effect of the above structure will also be described with reference to FIG. 1. When microwaves with a specified wavelength are supplied from the excitation port 8 into the heating chamber 2, the heating chamber 2 will follow the Due to the size (position of the wall) and the like, a predetermined standing wave is generated. As a result of this standing wave, unevenness in the strength of the electric field (the amount of heating energy) is generated in the heating chamber 2. However, since the bottom of the heating chamber 2 is provided by conduction The rotating plate 9 is made of a non-homogeneous shape in the direction of rotation. Therefore, the state of reflection or transmission of microwaves can be changed by using the rotation (change of the stop position) of the rotating plate 9 in the heating chamber 2 Different electric field distributions and heating distributions. For the rotating plate 9 in this embodiment, since there are a vertical rod 9 b continuously extending in one direction and a horizontal rod 9 c that is less than 1/2 the length of the microwave wavelength, a flow-through is formed. 'The current on the wall surface of the rotating plate 9 is rectified in a direction extended by the vertical rod 9 b, and the electric field distribution is changed in accordance with the propagation direction, that is, the stopping position of the rotating plate. Moreover, the rectangular opening 9 e (Please read the notes on the back before filling this page)

This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) -15- Printed by the Central Laboratories of the Ministry of Economic Affairs and Consumer Cooperatives 410260 A7 ___B7 V. Description of the invention (13) When the direction intersects with the long direction of the opening 9e, the microwave is easily transmitted, and when the direction of the microwave is consistent with the long direction of the opening 9e, the microwave is not easily transmitted. Thereby, a characteristic electric field and distribution can be obtained according to the stop position of the rotating plate 9, and the change of the electric field distribution can be increased as the stopping position of the rotating plate 9 changes. In other words, the heating distribution pattern becomes more numerous. Therefore, since the rotating plate 9 is continuously rotated, the change of the electric field distribution in the heating chamber 2 is increased with time, and since the food F itself is also rotated, the food can be heated without uneven heating. F is heated uniformly. However, the electric field distribution of this uniform heating is more suitable for heating relatively large foods (several yakiniku or pizza) that expand in the plane direction, but in the case of alcohol consumption, for example, with convection, it will cause the upper part The uneven heating caused by overheating in the upper and lower directions occurs. Moreover, from the viewpoint of heating efficiency, for example, in the case of hot rice, there is a problem that heating efficiency is low. In other words, depending on the type of food, it may be more appropriate to stop the rotating plate '9 at a specified stop position and directly heat it with a specified electric field distribution. That is, as shown in FIG. 4 (a), by using the stop position where the rotating plate 9 is stopped from the reference position to the angle A, the electric field distribution with the best heating efficiency for "hot rice" can be obtained, as shown in Fig. 4 As shown in Figure (b), by using the rotating plate 9 to stop from the reference position to an angle B different from the aforementioned angle A, the stop position can be obtained, which is suitable for "perfume" without uneven heating. Electric field distribution that can heat the lower part strongly and reuse convection to heat it uniformly in the vertical direction. This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) '-16- (Please read the precautions on the back before filling this page)

'Order- • &quot; Γ Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 410260 A7 B7 V. Description of the invention (彳 4) In the case of "defrosting conditioning", the rotary plate 9 is moved from the reference position to the angle A That is, the stopped stop position is heated for a certain period of time, and thereafter, the rotary plate 9 (food F) is continuously rotated for heating, so that heating with good heating efficiency without uneven heating can be performed. The stop positions (angles A, B, and C) of the rotary plate 9 to obtain the optimum electric field distribution like these food types can be obtained by, for example, an experiment in advance. These angles A, B, and C are most effective when the food F is placed in the center of the rotating plate 9 (the food placing tray 12). Therefore, in this embodiment, as shown in the flowchart of FIG. 1, the control circuit 4 controls the rotary plate 9. That is, the user operates the operation panel 3 to select the conditioning menu, and when the start key operation is turned on (step S1), the magnetron 5 will be driven and the heating conditioning will be started (step S2). Then, the rotating plate 9 is controlled in the following manner in step S3. At this time, it is first judged whether the conditioning menu selected by the user is a designated conditioning menu (referring to any of "hot rice", "steaming wine", and "thaw conditioning") (step S3). When the selected conditioning menu is a conditioning menu other than the designated conditioning menu (such as "steamed heating", etc.) (No), the rotating plate 9 is continuously rotated (step S4), and the food F is placed in the heating chamber 2 Rotary heating mode for heating while rotating inside. In contrast, in the case of a designated conditioning menu (Yes in step S3), the rotation of the rotating plate 9 is started (step S5), and the detection operation of the reference position by the light sensor 14 is performed ( Step S6). Next, when the reference position of the rotating plate 9 is detected (this paper size applies the Chinese National Standard (CNS) A4 specification (2I0X297 mm) (Please read the precautions on the back before filling this page)

-17-17- Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs_410260 b7_ V. Description of the invention (15) Yes at step S6), and then the conditioning menu is always set to have different controls (step s 7), When the conditioning menu is "hot rice", the rotating plate 9 is rotated only for a time T (A) from the time when the reference position is detected, and as shown in Fig. 4 (a), the distance from the reference position to the angle a The position is stopped (step S 8). Then, when the conditioning menu is "steaming", the rotation plate 9 is rotated only for a time T (B) from the time when the reference position is detected, and as shown in FIG. 4 (b), the angle B is advanced from the reference position. The position is stopped (step S 9). In this manner, when the conditioning menu is "hot rice" or "steaming wine", a stop heating mode is performed in which the rotary plate 9 is stopped at an angle A or B specified by the type of those foods F and then heated. If the specified conditioning time has elapsed, the conditioning is terminated (step S 10). When the conditioning menu is "thawing conditioning", first, the rotary plate 9 is rotated only for a time T (C) from the time when the reference position is detected, and then stopped from the reference position to the position of the angle C (step S 11). ), In this state, 'heat for a specified time (step S 1 2), and then switch to continuously rotate the rotating plate 9 (step S 13), while heating for the remaining time (step s 1 4), create Performs the combined heating mode. According to this embodiment, the rotating plate 9 made of a conductive material is used to form a heterogeneous shape in the direction of rotation, and according to the change of its stopping position, it is focused on obtaining a different electric field distribution in the heating chamber 2 and rotating it. The stop position of the plate 9 is comprised so that it may be controlled according to the heating of a conditioning menu (the kind of food F). As a result, it is possible to perform efficient heating in accordance with the type of food F, and it can perform heating without unevenness. The paper size is in accordance with the Chinese National Standard (CNS) A4 specification (210X297 mm) (please read the back first) Note: Please fill in this page again) α. -18- Printing bag A7 of the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs __410260_B7 _ V. Description of the invention (彳 6) The heating condition is in good condition, and because only the stop of the rotating plate 9 is used Position control can achieve the above-mentioned improvement in heating efficiency and heating unevenness, so it can be solved with a simple structure and exert excellent practical effects. In this case, especially in the present embodiment, the stop heating mode for stopping the rotating plate 9 is performed for the two types of food at different angles. Furthermore, the composite heating mode is created in other conditioning menus, and then In combination with the rotary heating mode, the heating distribution mode can be increased, and a variety of heating modes can be selected. The selection range suitable for heating according to the type of food will increase, which can further improve the heating efficiency and heating. Effect of improvement in unevenness. In addition, in this embodiment, the reference position of the rotating plate 9 is detected by the light sensor 14 and the stop position of the rotating plate 9 is controlled according to the rotation driving time of the rotating plate 9 from the reference position. Therefore, even if the stop position for stopping the rotating plate 9 is plurally set, the rotating plate 9 can be surely stopped at the specified stopping position, and the stop position of the rotating plate 9 can be easily detected and controlled. Advantages of location composition. In addition, in this embodiment, the grid inside the rotating plate 9 is formed by a vertical rod 9 b continuously extending in one direction, and a horizontal rod 9 c that is divided in such a manner that the length is less than 1/2 of the microwave wavelength. With this structure, since several rectangular openings 9 e are formed, it is possible to sufficiently increase the distribution of the electric field that changes with the stop position of the rotating plate 9. Moreover, in the above embodiment, although the pairing of three types of conditioning menus of "hot rice", "steaming wine", and "thaw conditioning" is performed, the heating mode is stopped or reset {CNS) Α4 ^ Μ · {210X297 ^) HI — —— β! (Please read the precautions on the back before filling out this page) -Order_ -19- Printed by the Central Consumers Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 410260 V. Description of the invention (彳 7) Composition of the combined heating mode 'but it can also be made Only in one type of conditioning menu, for example, "stop mode" is executed only when "steaming". Conversely, for more various conditioning menus, different stop heating modes such as stop positions can be executed for each. In this case, it is best to set the compound heating mode when necessary. In addition, even if the configuration of the rotating plate 9 (the shape or spacing of the lattice, the size of the openings, etc.) can be made into a non-uniform shape in the direction of rotation, it can be deformed in various ways. (2) Second to seventh embodiments Next, the second to seventh embodiments of the present invention will be described in the following order with reference to FIGS. 7 to 12. In addition, the embodiment described below can be said to be the first embodiment described above, and it can also be said to be a modified example. The basic part is common to the first embodiment described above. Therefore, the parts that are common to the above-mentioned first embodiment are denoted by the same reference numerals, and detailed descriptions and new illustrations are omitted. The following description will focus on the features. Fig. 7 'is a flowchart showing a second embodiment of the present invention (corresponding to the second invention in the patent application range), and a flowchart of a program for controlling rotation of the rotary plate 9; This embodiment is different from the first embodiment described above in that the type of the food F (the conditioning menu) is automatically determined. That is, when the user sets the start switch to ON, the heating is started (step S21), and then the automatic determination of the conditioning menu is performed (step S2 2). The following steps are the same as in the first embodiment. Control (steps S 3 to S 1 4). In this case, the detailed description is omitted, and the automatic discrimination of the above conditioning menu is to use a gas sensor (alcohol sensor, steam sensor). The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (please Please read the notes on the back before filling this page.) -20- 410260 A7 B7 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of the invention (,.) Ίο), or weight sensor, shape sensor, etc. Being executed. The time required for this automatic discrimination is set to within 10 seconds or a very short time. According to this second embodiment, the same effects and effects as those of the first embodiment can be obtained. Fig. 8 shows a third embodiment of the present invention (corresponding to the seventh invention). In this embodiment, the reference position of the rotating plate 9 is detected as the stop position detection means, instead of the reflective light sensor 14 in the first embodiment, and the corner portion inside the heating chamber 2 is used. The light-transmitting light sensor 2 1 arranged opposite to the light-emitting unit 2 1_ a and the light-receiving unit 2 1 b. Then, at this time, a protruding portion 22 protruding in the outer circumferential direction is provided at a designated position on the outer green portion of the rotating plate 9. In such a configuration, the reference position of the rotating plate 9 is set at a position where the projection section 2 crosses the optical axis between the light projection section 2 1 a and the light receiving section 2 1 b, and the light sensor 2 1 can be used. To detect the reference position of the rotating plate 9. Fig. 9 shows a fourth embodiment of the present invention (corresponding to the invention in the eighth item of the patent application range). In this embodiment, a magnet 23 is provided at a designated position on the outer peripheral edge portion of the rotating plate 9, and a wall element of the heating chamber 2 is provided with a Hall element or the like as a stop position detecting means for detecting the reference position of the rotating plate 9. Magnetic sensor 2 4. In such a structure, the reference position 0 of the rotating plate 9 is also detected by using the magnetic sensor 24 to detect the magnet 23. Fig. 10 shows a fifth embodiment of the present invention (corresponding to the ninth item in the scope of patent application). Invention). Here, the rotating plate 9 is connected to the upper end of the rotating shaft 25 which is driven to rotate by the RT motor 11, but this (本 Please read the precautions on the back before filling this page)

Revision-This paper size applies the Chinese National Standard (CNS) Λ4 specification (210X297); ^-21-Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 410260 a? ___B7_ V. Description of Invention (19) In the embodiment, The upper part 2 5 a of the rotation axis 25 is rectangular in cross section (upper surface), and the rotation plate 9 is configured so as to be connected to a predetermined rotation direction position with respect to the rotation axis 25. Then, on the lower side of the bottom plate of the heating chamber 2 (furnace 1), a cam 2 6 protruding in the outer peripheral direction is provided on the rotation shaft 25, and a switch 2 7 activated by the cam 2 6 is provided. To constitute a stop position detecting means. In such a configuration, when the cam 2 6 is used to start the switch 27, the reference position of the rotary plate 9 is detected, and the stop position of the rotary plate 9 is controlled similarly. Thereby, a mechanism for detecting the stop position of the rotary plate 9 can be provided outside the heating chamber 2, and advantages such as assembly and heat resistance can be obtained. The shape of the upper end portion of the rotation shaft 25 may be various shapes other than a rectangular shape in cross section, or an ellipse or a so-called D-cut. The method for stopping the rotary plate 9 at a predetermined stop position is not limited to the method of detecting the reference position and then performing time control. For example, if there is only one stop position, the sensor may be configured to obtain a detection signal when the rotary plate 9 is positioned at its stop position, and the rotation may be stopped immediately. When the rotating plate 9 is point-symmetric, two detection positions can be set every 180 degrees. When there are several stop positions, a configuration can be made in which several switches (perceptrons) are provided at each position. In addition, even if it is a single switch, it is possible to stop at a plurality of stop positions by using the number of times the message is obtained. Furthermore, a configuration may be adopted in which the rotation angle of the rotation plate 9 (rotation axis 10, 25) is directly detected by an encoder or the like. In addition, the direction of rotation of the motor that drives the rotating plate 9 cannot be directed toward one (please read the precautions on the back before filling in this I)-_ | -------- Order -------- -Weft. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -22- Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 410260 at _: ___B7___ V. Description of Invention (2) Direction In the case of setting the reference position as described above between the stop position and its point-symmetrical position, and rotating the rotating plate 9 at 90 degrees from the detection position of the reference position, it can be rotated in any direction. Stop at the specified stop position. ^ Figure 11 shows a sixth embodiment of the present invention (corresponding to the 10th invention in the scope of patent application). Here, as described above, even if the heating distribution in the heating chamber 2 can be set to an optimal heating distribution according to the conditioning menu, especially for a small food F, if the food F is not placed on the food tray 1 2 In the appropriate position, the effect of its heating distribution cannot be fully obtained. Therefore, in the present embodiment, marks 2 8 and 29 indicating positions suitable for placing the food F are displayed on the food placing tray 12. In this case, the marks 28 and 29 are made up of patterns representing "rice" and "wine". At this time, as a matter of course, the food placing tray 12 is placed at a position in the rotation direction designated with respect to the rotating plate 9. As a result, the user can place the food F at a position where the effect of the heating distribution can be completely obtained. Fig. 12 · shows a seventh embodiment of the present invention (corresponding to the 11th invention in the scope of patent application). In this embodiment, a method of irradiating the illumination lamp 30 to the upper surface of the food placing tray 12 to indicate the position suitable for placing the food F is used instead of the pattern formed in the sixth embodiment. Mark 28, 29. With such a structure, the label can be easily understood and prominent. (3) Eighth embodiment This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page)

-Order- -23- Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs 410260 A7 B7 V. Description of the invention (21) Next, with regard to the eighth embodiment of the present invention (corresponding to the application scope Nos. 13, 14'15, 16, Inventions of 17, 18) will be described with reference to FIGS. 13 to 15. First, Fig. 13 shows the configuration of the rotating plate 31 in this embodiment. The rotating plate 31 is similarly subjected to enamel treatment on the surface of a conductive material such as a steel plate, and the overall shape is formed into a circular shallow disk shape and a heterogeneous shape in the direction of rotation (a symmetrical shape about the center point). Specifically, the rotating plate 3 1 is formed in a grid shape in which a plurality of vertical rods 3 1 b and a plurality of horizontal rods 3 1 c perpendicular to the rotating frame 3 1 a are integrally formed in a ring-shaped peripheral frame 3 1 a. . A projection 3 1 d connected to the rotation shaft 10 (refer to FIG. 15) is provided at a central portion thereof. At this time, the vertical rods 3 1 b are continuously extended in one direction from one end portion to the other end portion in the surrounding frame 3 1 a (the front-back direction in the figure), and are arranged in the left-right direction at approximately equal intervals in the figure. On the other hand, most of the horizontal rods 3 1 c are formed in a shape that is not cut to a length smaller than 1/2 of the microwave wavelength λ (about 1 2 mm). At this time, in this embodiment, a plurality of approximately square central openings 3 2 composed of vertical rods 31 b and horizontal rods 31 c are formed in the central portion of the rotating plate 31 (there are four surrounding the protruding portion 3 1 d). And there are two before and after, a total of six). The central opening 32 has a horizontal and vertical dimension c which is equal to or greater than 1/4 of the microwave wavelength λ ', such as 31 mm. In addition, in the outer peripheral portion of the rotating plate 31 (the left and right parts in the figure of the central opening portion 32 formation portion), several long rectangular openings of approximately the same size are formed in the front-rear direction in the figure. Department 3 1 e. The opening 3 1 e is the same as above. The paper size is in accordance with the Chinese National Standard (CNS) A4 (210X297 male *) (Please read the precautions on the back before filling this page)

410260 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 _______B7_ V. Description of the Invention (22) I The first embodiment described above is similarly 'make the longitudinal dimension a to λ / 2 or more, for example 6 4mm; ; 1_ / 4, for example, 30 mm ° Then, as shown in FIG. 14 and FIG. 15, a microwave oscillated from the magnetron 5 is provided on the right side of the heating chamber 2 through the waveguide 3. 3 (refer to FIG. Γ5) is supplied to the excitation port 3 4 in the heating chamber 2, but the excitation port 34 is provided at a height dimension d from the rotating plate 31 described above, which is 1/2 of the microwave wavelength λ At the following height /, as shown in FIG. 15, the wall portion 3 3 a connected to the lower end of the excitation port 3 4 at the exit portion of the waveguide 3 3 is made to descend toward the excitation port 34. shape. Furthermore, in this embodiment, as shown in FIG. 15, a raised portion 35 corresponding to the central portion of the rotary plate 31 is formed on the bottom surface portion of the heating chamber 2 so as to form a mountain-like shape (conical shape with a small gradient). / In such a configuration, since the central opening portion 32 is formed in the central portion of the rotary plate 31, the central opening portion 32 is used to allow microwaves to easily pass through the central portion of the rotary plate 3. Therefore, the number of reflection heating chambers 2 is increased. The transmittance of microwaves on the bottom surface toward the upper portion of the center portion of the rotating plate 31 can heat the food F placed on the center portion of the rotating plate 3 1 (the food placing tray 1 2) more strongly. In this case, since the excitation port 34 is set at a relatively low position, the microwave supplied from the excitation port 34 to the heating chamber 2 can easily enter the rotating plate 31 and the heating chamber 2 Between the bottom surfaces, and because the wall portion 3 3 a connected to the lower end of the excitation port 3 4 of the waveguide 3 3 is formed in a downwardly inclined shape, the microwaves supplied into the heating chamber 2 are formed toward the main surface. Paper size General China National Standard (CNS) A4 (210X297 mm) (Please read the notes on the back before filling in this S), ¾. Order-key one-25- Printed by the Consumers ’Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs a? __B7_ V. Description of the invention (23) The lower guide makes it easier to enter between the rotating plate 31 and the bottom surface of the heating chamber 2. Furthermore, since a raised portion 3 51 is provided on the bottom surface portion of the heating chamber 2 so that microwaves entering the bottom surface of the heating chamber 2 can be formed using the raised portion to be directed upward through the central portion of the rotating plate 31, and more Microwave transmission at the center of the rotating plate 31 can be promoted. Similarly to the rotating plate 9 of the first embodiment, the rotating plate 3 1 has a vertical rod 3 1 b extending continuously in one direction and a horizontal rod 3 1 c having a length less than 1/2 of the microwave wavelength λ, and There is also a rectangular opening 3 1 e. Therefore, the stopping position of the rotating plate 31 can be used to obtain a characteristic electric field distribution, and the electric field distribution can be sufficiently increased as the stopping position of the rotating plate 31 is changed. Variety. In addition, the present invention is not limited to the above-mentioned embodiments, and can be appropriately modified without departing from the gist. In this case, although the illustration is omitted, in each of the embodiments described above, when the stop heating mode is executed in which the rotating plate 9 and 31 are stopped at a predetermined stop position and the food F is reheated, the rotating plate 9 can be performed. 3, 1 Performs the control that makes 180 rotations and stops at the midpoint of the way (corresponding to the 19th invention in the scope of patent application). With this, even when intense microwave irradiation is formed from one side of the food F, and the opposite side of the food F becomes dark, the form of the food F is reversed at 180 degrees during heating, so that Equalize microwave irradiation on both sides. At this time, since the rotating plates 9, 31 are formed in a point-symmetrical shape, there is no change in the mode of the radio wave distribution, and Ken g is heated under the optimum radio wave distribution. This paper size is applicable to the national standard (CNS) A4 specification (2J〇x 297 mm) -26- (Please read the precautions on the back before filling this page)

A7 B7 410260 V. Description of the invention (24) [Effects of the invention] As can be understood from the above description, according to the microwave oven of the present invention, since the rotating plate provided at the bottom of the heating chamber to support food is composed of a conductive material in a rotating direction It has a non-homogeneous shape, and the stop position of the rotating plate is set as a control means to control heating in response to food. Therefore, it is possible to improve heating efficiency and improve heating unevenness in the east. In addition, it is possible to have a simple structure. Achieved advantages. [Brief description of the drawing] Brief description of the drawing FIG. 1 is a flowchart of a control sequence of a display rotary plate according to the first embodiment of the present invention. 1 Figure 2 is a schematic block diagram showing the electrical configuration. Fig. 3 is a schematic perspective view showing a heating chamber. Fig. 4 is a perspective view showing a stop position (a) 'of the rotary plate suitable for hot rice and a stop position (b) of the rotary plate suitable for simmering wine. Fig. 5 is a plan view of a rotating plate. Fig. 6 is a perspective view showing important parts of the heating chamber of the light sensor. Fig. 7 shows a second embodiment of the present invention which is equivalent to Fig. 1; Fig. 8 shows a third embodiment of the present invention which is equivalent to Fig. 6; Fig. 9 shows a fourth embodiment of the present invention; The paper size corresponding to the chart in Figure 6 applies the Chinese National Standard (CNS) A4 specification (2I0X297 mm) (Read the notes on the back of the poem before filling out this page) System-27- Printed by Zhengong Consumer Cooperative, Central Standards Bureau of the Ministry of Economic Affairs 410260 A7 __; _; ___ B7 V. Description of the invention) zo No. 10 The figure shows the fifth embodiment of the present invention. The rotation axis of the embodiment: Partial Perspective. Figure D Figure 1 1 shows a body view of a rotating plate (food placing tray) of a sixth embodiment of the present invention. Figure 12 shows a seventh embodiment of the present invention which is equivalent to Figure 11 Fig. 0 and Fig. 1 are diagrams showing the eighth embodiment of the present invention. Fig. 5 and Fig. C. Fig. 14 shows the appearance of the heating chamber. Figure 15 is a front view in vertical section showing the structure of the lower half of the heating chamber. [Figure No. 2 heating chamber 4 control circuit (control means) 5 magnetron. (Microwave supply means) 8 3 4 Excitation □ 9 X 3 1 Rotating plate 9 a, 3 1 a Peripheral frame 9 b, 3 1 b Vertical rod 9 c, 3 1 c Horizontal rod 9 e '3 1 e Opening section 1 0, 2 5 Rotary shaft (please First read the notes on the back and then fill out this page) Order · The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297) -28- 410260 a? B7 V. Description of the invention (26 &gt; Central Standard of the Ministry of Economic Affairs Printed by the Bureau's Consumer Cooperative 1 1 RT motor (drive mechanism) 1 2 Food tray 1 4 '2 1 Light sensor 2 4 Magnetic sensor 2 7 Switch 2 8' 2 9 Mark 3 0 Lighting 3 2 Central Open Π section 3 3 waveguide 3 3 a wall section 3 5 bulge F Food (Please read the notes on the back before filling this page)

The bound paper is again applicable to the Chinese National Standard (CNS) A4 specification (210X2.97 mm) -29-

Claims (1)

6. Application for Annex 3 of Special Temples Patent Application No. 8 7 1 0 7 4 7 2 Chinese Patent Application Scope Amendment Republic of China 1988 Amendment 1 · A microwave oven characterized by having: a heating chamber, and a microwave supply A microwave supply means into the heating chamber is provided with a rotating plate for supporting food in a bottom portion of the heating chamber which is formed of a conductive material and is formed in a non-homogeneous shape in a direction of rotation, and a driving mechanism for driving the rotating plate. And a control means for controlling the stop position of the rotating plate so as to heat the food. 2. For the microwave oven of the first scope of the patent application, the control means can stop the rotating plate at a designated stop position according to the type of food inputted by the user or automatically determined, and then heat it. 3. The microwave oven according to item 1 or 2 of the scope of patent application, which has a rotary heating mode for heating the food while rotating the rotary plate, and a heating mode for stopping the heating of the food by stopping the rotary plate at a designated stop position, according to the food Kinds_Select heating mode. 4 · The microwave oven of item 1 or 2 of the patent application scope. Among them, there is a method of heating food in a state where the rotating plate is stopped at a specified stop position according to the type of food, and a method of heating the food while rotating the rotating plate. The resulting composite heating mode. 5 · If the microwave oven for item 1 or 2 of the scope of patent application, the paper size applicable to the Chinese National Standard (CNS) A4 specifications (210X297 mm) tn ^ nt (Please read the precautions on the back before filling this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs I ---; --Ί I ^ ------ Θ II 6. Application for Annex 3 of Special Temples Patent Application No. 8 7 1 0 7 4 7 2 Chinese Patent Application Scope Amendment Republic of China 1988 Amendment 1 · A microwave oven characterized by having: a heating chamber, and a microwave supply A microwave supply means into the heating chamber is provided with a rotating plate for supporting food in a bottom portion of the heating chamber which is formed of a conductive material and is formed in a non-homogeneous shape in a direction of rotation, and a driving mechanism for driving the rotating plate. And a control means for controlling the stop position of the rotating plate so as to heat the food. 2. For the microwave oven of the first scope of the patent application, the control means can stop the rotating plate at a designated stop position according to the type of food inputted by the user or automatically determined, and then heat it. 3. The microwave oven according to item 1 or 2 of the scope of patent application, which has a rotary heating mode for heating the food while rotating the rotary plate, and a heating mode for stopping the heating of the food by stopping the rotary plate at a designated stop position, according to the food Kinds_Select heating mode. 4 · The microwave oven of item 1 or 2 of the patent application scope. Among them, there is a method of heating food in a state where the rotating plate is stopped at a specified stop position according to the type of food, and a method of heating the food while rotating the rotating plate. The resulting composite heating mode. 5 · If the microwave oven for item 1 or 2 of the scope of patent application, the paper size applicable to the Chinese National Standard (CNS) A4 specifications (210X297 mm) tn ^ nt (Please read the precautions on the back before filling this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs I ---;-Ί I ^ ------ Θ II A8 ^ ί〇26〇g | 6. The scope of application for patents includes the detection of the stop position of the rotating plate. The position detection means, the control means will control the stop of the rotating plate according to the detection result of the stop position detection means {Please read the precautions on the back before filling this page). 6. The microwave oven according to item 5 of the scope of patent application, wherein the stop position detecting means is configured to detect the reference position of the rotating plate, and the control means makes the rotation position based on the rotation driving time from the reference position of the rotating plate. The rotating plate stops at the specified stop position. 7. The microwave oven according to item 5 of the patent application scope, wherein the stop position detection means is formed by a light sensor. 8 _ The microwave oven according to item 5 of the patent application scope, wherein a magnetic position sensor is used to constitute a stop position detecting means. 9. The microwave oven according to item 6 of the scope of patent application, wherein the stop position detection means detects the rotation plate indirectly by detecting an angle of a rotation axis connected to the rotation plate by the rotation direction position designated by the rotation plate to rotate the rotation plate. Stop position. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs of the People's Republic of China 10 _If the microwave oven for item 1 or 2 of the scope of patent application is applied, it is displayed on the rotating plate or on a food placing plate provided on the rotating plate, which is suitable for placing Mark of food location. 1 1. The microwave oven according to item 10 of the scope of patent application, wherein the indication is displayed by irradiation of a lighting lamp. 1 2. The microwave oven according to item 1 or 2 of the scope of patent application, wherein the rotating plate is formed into a grid shape of vertical bars and horizontal bars perpendicular to the rotating bars in the surrounding frame, wherein the vertical bars continuously extend in one direction, and the horizontal bars It is cut in a length less than 1/2 of the microwave wavelength. This paper size applies to China National Standards (CNS) A4 specifications (210X297 mm) A8 410260 1 々, patent application park 1 3. For the microwave ovens in the scope of patent application No. 1 or 2, where the rotating plate is attached to the surrounding frame The inside is made into a grid shape with a vertical rod and a horizontal rod orthogonal to it, and a central opening portion having a length and a length both of which are 1/4 or more of a microwave wavelength is provided at a central portion thereof. 14. The microwave oven according to item 13 of the scope of patent application, wherein the excitation port for supplying microwaves into the heating chamber is provided on the side wall portion of the heating chamber, and the height from the rotating plate is less than 1/2 of the microwave wavelength. 1 5 · The microwave oven according to item 14 of the scope of patent application, wherein the wall portion that is connected at the lower end of the excitation opening of the waveguide of the waveguide in the heating chamber is connected to the downwardly inclined shape of the excitation opening. . 16 · The microwave oven according to item 14 of the scope of patent application, wherein the bottom surface portion of the heating chamber corresponding to the central portion of the rotating plate is bulged into a mountain shape. 17. The microwave oven according to item 14 of the scope of patent application, wherein a rectangular portion of the rotating plate is formed with a length of 1/2 or more of the microwave wavelength in the longitudinal direction and a length of less than 1/4 of the microwave wavelength in the horizontal direction. Shaped opening. 18. The microwave oven according to item 14 of the scope of patent application, wherein the vertical rods of the grid of the rotating plate are provided to extend continuously from one end portion to the other end portion of the surrounding frame in one direction. 19. The microwave oven according to item 14 of the scope of patent application, wherein the control means is to stop the rotating plate at a designated stop position to heat food, and at least once perform the operation of rotating the rotating plate 180 degrees and then stopping. Paper size applies to China National Standards (CNS &gt; Α4 size (210X297 mm) (Please read the notes on the back before filling in this page)) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs—πϋ · — ^- ---- Γ .--- ί 1L --- ί -3-