CN1216361A - 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

Micro-wave oven

The present invention relates to have the swivel plate that is used for support food, by in this heating clamber, supplying with the micro-wave oven that microwave heats food in the bottom of heating clamber.

In the micro-wave oven that carries out heating using microwave, result from sometimes microwave standing wave and in heating clamber, produce the uneven situation of power (size of heat energy) of electric field.Thus, the efficiency of heating surface in the time of will causing heating smaller food (one bowl of meal or a spot of dish etc.) worsens, and perhaps produces inhomogeneous etc. the undesirable situation of heating when the roomy bigger food of flat heated direction (a plurality of steamed dumplings with the dough gathered at the top and Pizza etc.).

In this case, food holding tray (rotating disk) rotation of placing food is heated, though yet the heating that can control circumferencial direction is inhomogeneous, but for example be positioned under the situation of sidewall at the excitation mouth, a little less than the heating of the middle body of food holding tray, outer circumferential side forces partly that the heating of radial direction of heat etc. is inhomogeneous still to be existed.In addition, it is inhomogeneous to improve the heating of above-below directions such as canned wine.And then, under the situation of the central part that little food is placed on the food holding tray, can not reach the fully high efficiency of heating surface.

So, inhomogeneous in order to improve the efficiency of heating surface or to improve heating up to now, considered several structures of the following stated.Yet any structure all has certain shortcoming, does not all constitute very effective structure.

That is,, the intelligent element of impedance adjustment usefulness is set in waveguide,, the maximal efficiency condition of magnetron is adjusted in the baking oven impedance, to realize high efficiency according to the state of baking oven (heating clamber) as the 1st conventional example.Yet in such device, existing the conductor that is arranged at the impedance adjustment usefulness in the waveguide becomes the reason that produces spark, produces if suppress spark, reduces the shortcoming that effect is adjusted in impedance on the contrary.

As the 2nd conventional example, also consider to be provided with movable excitation mouthful at the position, bottom surface of heating clamber, make this movable excitation mouthful under food, move and heat effectively.Yet in such device, the driving mechanism complexity of movable excitation mouth is provided with difficult poor practicability.In addition,, when considering to constitute rotation food holding tray it is moved along the vertical direction, move up and down improvement by it and add heat distribution as the 3rd conventional example.Yet, in this structure, need to drive under the affix structure of food holding tray, have baroque shortcoming.

The present invention produces in view of above situation, its purpose be to provide can seek to improve the efficiency of heating surface and improve heating inhomogeneous, and the micro-wave oven that just can deal with problems with simple structure.

In micro-wave oven, food directly or through the food holding tray (rotating disk) that is made of the electric wave transmission material is placed on the swivel plate that is made of conductive material that is arranged at the heating clamber bottom.The present inventor is conceived to the function as electric wave reflector of the swivel plate that is made of conductive material, discovery is by constituting non-homogeneous shape to swivel plate along direction of rotation, upset standing wave according to this rotation not only out of orderly, and by changing the position (anglec of rotation) of swivel plate, in heating clamber, obtain different Electric Field Distribution and add heat distribution, thereby finished the present invention.

Promptly, micro-wave oven of the present invention is characterised in that to have heating clamber, in this heating clamber, supply with the microwave feeding means of microwave, constitute non-homogeneous shape and be arranged on the swivel plate of above-mentioned heating clamber bottom support food along direction of rotation by conductive material, rotation drives the driving mechanism of this swivel plate, controls the stop position that makes at above-mentioned swivel plate and carries out control device (the 1st scheme of invention) corresponding to the heating of food.

Here, for various foods according to its size and kind such as shape, exist suitable predetermined add heat distribution or predetermined a plurality of combinations that add heat distribution, make for example for foods such as canned wine, the heating that is suitable for the heating enlarged lower part that reduces top does not produce along above-below direction heats the uneven heat distribution that adds, for one bowl of smaller food such as meal, be suitable for the central part force hot heating clamber such add heat distribution, for the roomy bigger food of in-planes such as a plurality of steamed dumplings with the dough gathered at the top, be suitable for and evenly add heat distribution along in-plane.

If according to above structure, change the stop position of swivel plate as described above, then can access and differently in the heating clamber add heat distribution, control the stop position that makes at swivel plate with control device and carry out heating corresponding to food.Thereby, can in the efficient heating of carrying out for food, can also not heat the uneven cooking of well finishing situation.And only the control by rotation just can realize above-mentioned advantage, and structure is too complicated just can deal with problems so can not make.

In this case, as the control form of the stop position of the swivel plate that is undertaken by control device, swivel plate stop the rotation (the 2nd scheme of invention) can be made corresponding to predetermined stop position by food species user's input or that judge automatically.The rotation heating mode of heat food and at the predetermined stop position static heating mode (the 3rd scheme of invention) that the rotation of plate heats food that stops the rotation when in addition, can also select to make the swivel plate rotation according to food species.And then, can also constitute kind, the compound heating mode (the 4th scheme of invention) that the mode combinations of carrying out the food heating when carrying out the pattern of food heating under the state of the plate that stops the rotation at predetermined stop position and making the swivel plate rotation is got up according to food.

If according to these schemes, then because to add the pattern of heat distribution more, thus the abundant heating mode of kind can be selected, therefore, range of choice when having increased the heating of carrying out corresponding to food species can further improve and relevantly the efficiency of heating surface is risen and improves the uneven effect of heating.

And, can constitute the stop position detection device that the stop position that detects swivel plate is set, use the stop position (5th scheme of invention) of control device according to the testing result control swivel plate of this stop position detection device.Thus, also can make swivel plate stop at predetermined stop position reliably even set a plurality of stop positions that swivel plate is stopped.

At this moment, can constitute when using stop position detection device to detect the reference position of swivel plate, use the control device basis to make this swivel plate stop at predetermined stop position (the 6th scheme of invention) from the rotation driving time of the reference position of swivel plate, thus, can be configured for the structure that stop position detects and stop position is controlled of swivel plate simply.And then in this case, can also use optical sensor (the 7th scheme of invention), perhaps use Magnetic Sensor (the 8th scheme of invention) to constitute stop position detection device, thus, can be with simple structure detection reference position.

Perhaps, can also constitute and stop position detection device is detected in predetermined direction of rotation position connect the angle that swivel plate makes the rotating shaft of this swivel plate rotation, detect the stop position (the 9th scheme of invention) of swivel plate indirectly.Thus, can be used to detect the mechanism of the stop position of swivel plate in the outer setting of heating clamber.

In addition, promptly allow to as described above the heat distribution that adds in the heating clamber is taken as the distribution that is suitable for food, yet,, can not fully obtain adding the effect that heat distribution produces by it if food is not present on the suitable position for especially little food.So, can constitute at swivel plate or be arranged at the mark (the 10th scheme of invention) that expression on the food holding tray on this swivel plate shows the position that is suitable for placing food, the user can be placed on food and can fully obtain by on the position that adds the effect that heat distribution produces.At this moment, can carry out the demonstration (the 11st scheme of invention) of mark, the eye-catching demonstration that can be easy to judge according to the irradiation of a light.

And as previously discussed, for stop position by the change swivel plate, in heating clamber, obtain different Electric Field Distribution and then add heat distribution, the structure of swivel plate is also extremely important, especially by its shape is taken as suitable shape, can strengthen the Electric Field Distribution of the stop position change of accompanying rotation plate, promptly increase the pattern that adds heat distribution.Need to realize as directly or by the function of the script of the swivel plate of food holding tray support food, this is self-evident.

So, swivel plate constituted in frame, have vertical rod and latticed with the horizontal bar of its quadrature, be vertical bar construction the structure of extending continuously along a direction wherein, the length that the while constitutes horizontal bar each root is less than 1/2 length (the 12nd scheme of invention) of microwave wavelength.Thus, by microwave irradiation to the swivel plate that constitutes by electric conductor, flow through the wall electric current along the lattice portion branch, its wall electric current be rectified into along as the folk prescription of vertical excellent bearing of trend to flowing, be that the stop position changing electric field of swivel plate distributes according to its flow direction.In addition, on the horizontal bar direction of conduct less than 1/2 length of microwave wavelength, electric current is difficult to flow through.Thereby, the variation that can strengthen the Electric Field Distribution that is accompanied by the change of swivel plate stop position.

In addition, can constitute swivel plate have vertical rod and network-like with the horizontal bar of its quadrature in frame, part is offered in length and breadth all the central opening part (the 13rd scheme of invention) greater than 1/4 length dimension of microwave wavelength in the central.Thus, owing to be easy to see through the central part of swivel plate by central opening part microwave, so will strengthen the transmissivity of the microwave of reflection bottom of heating chamber towards swivel plate central part top, its result can heat the food that is placed on the swivel plate central part more strongly.

In this case, can be arranged on the excitation mouth that is used in heating clamber supplying with microwave in the sidewall sections of heating clamber apart from the height of swivel plate 1/2 position (the 14th scheme of invention) less than microwave wavelength, thus, can make the microwave that is given in the heating clamber from the excitation confession be easy to enter between the bottom surface of swivel plate and heating clamber.At this moment, can be taken as the wall portion that the lower end connected of the excitation mouth of the exit portion of the waveguide that in heating clamber, imports microwave towards this excitation mouthful shape (the 15th scheme of invention) that decline is tilted, constitute the microwave that is given in the heating clamber from the excitation confession and be directed to the below, can further make microwave be easy to enter between the bottom surface of swivel plate and heating clamber.

And then, can also be taken as the shape (the 16th scheme of invention) that becomes mountain font protuberance corresponding to the part of the central part of swivel plate to the bottom surface portions of heating clamber.Thus, the shape that the microwave that enters into the bottom of heating chamber part passes through to swell can be promoted the transmission of the microwave of swivel plate central part further by the central part guiding top from heating clamber.

And, as the opening portion that forms the swivel plate grid,, can form vertically, laterally less than the opening portion (the 17th scheme of invention) of 1/4 rectangular shape of microwave wavelength greater than 1/2 of microwave wavelength in the outer circumferential portion of swivel plate.Thus, when the length direction with respect to the direction of advance opening portion of microwave intersected with it, its microwave was easy to see through, and microwave is difficult to see through when the direction of advance of microwave is consistent with the length direction of opening portion.Its result can strengthen the change of accompanying rotation plate stop position and the variation of the Electric Field Distribution that produces.

In this case, can the vertical bar construction of the network of swivel plate be from an end in the frame to another end along folk prescription to continuously (the 18th scheme of invention), thus, irradiation by microwave, vertical rod along network flows through the wall electric current, can distribute by the stop position changing electric field of swivel plate.

In addition, can also constitute at predetermined stop position and stop the rotation the rotation of plate when food is heated, use above-mentioned control device at least once to make above-mentioned swivel plate Rotate 180 degree stop the action (the 19th scheme of invention) of above-mentioned swivel plate rotation later on.Thus, even strong from the irradiation for a direction microwave of food, the face of an opposite side of food becomes under the situation of the so-called back, becomes the form of food being carried out 180 degree upsets in heating process, can make the irradiation equalization of microwave for two faces.

The simple declaration of accompanying drawing:

Fig. 1 illustrates the 1st embodiment of the present invention, is the flow chart that the control sequence of swivel plate is shown.

Fig. 2 is the block diagram that electric structure roughly is shown.

Fig. 3 is the perspective view of the summary in the heating clamber.

Fig. 4 is the perspective view of stop position (b) that the swivel plate of the stop position (a) of the swivel plate that is fit to the rice heating and suitable canned wine is shown.

Fig. 5 is the plane of swivel plate.

Fig. 6 is the perspective view that the major part in the optical sensor heating clamber partly is shown.

Fig. 7 is the figure suitable with Fig. 1 that the present invention the 2nd embodiment is shown.

Fig. 8 is the figure suitable with Fig. 6 that the present invention the 3rd embodiment is shown.

Fig. 9 is the figure suitable with Fig. 6 that the present invention the 4th embodiment is shown.

Figure 10 is the perspective view that the rotating shaft part of the present invention the 5th embodiment is shown.

Figure 11 is the perspective view of swivel plate (food holding tray) that the present invention the 6th embodiment is shown.

Figure 12 is the figure suitable with Figure 11 that the present invention the 7th embodiment is shown.

Figure 13 is the figure suitable with Fig. 5 that the present invention the 8th embodiment is shown.

Figure 14 is the perspective view that situation in the heating clamber is shown.

Figure 15 is the vertical profile front view that heating clamber the latter half structure roughly is shown.

The working of an invention form

Below, with reference to the description of drawings several embodiments of the present invention.

(1) the 1st embodiment

At first, referring to figs. 1 through Fig. 6 the 1st embodiment of the present invention (corresponding to scheme 1,2,3,4,5,6,7,12) is described.

Fig. 3 and Fig. 4 roughly illustrate the situation of heating clamber inside of the micro-wave oven of present embodiment.This micro-wave oven is provided with the baking box 1 that constitutes the positive rectangular box shape of opening in not shown outer container, baking box 1 is interior as heating clamber 2.In addition, though not shown, yet in the front of outer container, the door that is used to open and close above-mentioned heating clamber 2 is being set, simultaneously, in its right positions, the user is being set is being used to select food species (cooking menu), setting the cooking time, the guidance panel 3 (only shown in Figure 2) of indication cooking starting etc.As shown in Figure 2, the operation signal of this guidance panel 3 is input in the control circuit 4 that is made of microcomputer etc.

In addition, though at length do not illustrate, yet in above-mentioned outer container, the position, right side that is positioned at baking box 1 is being provided with the Machine Room, and is in this Machine Room, such shown in the part of Fig. 2, magnetron 5 and its drive circuit of the microwave that vibrates are being set, fan assembly 6, above-mentioned control circuit 4 etc.And then, in the present embodiment,, the heater 7 (only shown in Figure 2) that is used for the cooking thing is being set at the top of heating clamber 2.

, (, Fig. 4) supply in the heating clamber 2 by not shown waveguide from the microwave of above-mentioned magnetron 5 vibrations from the excitation mouth 8 of the right side that is formed at above-mentioned baking box 1 in this case with reference to Fig. 3.Thereby, constitute microwave feeding means by magnetron 5 and waveguide etc.In addition, as shown in Figure 2, above-mentioned magnetron 5, fan assembly 6, heater 7 is controlled by above-mentioned control circuit 4.

And the bottom in above-mentioned heating clamber 2 also as shown in Figure 5, for example is being provided with and is implementing enamel handle on the surface of the conductive material of steel plate etc., and whole profile is made the swivel plate 9 of circular flat disk shape.Shape aftermentioned for this swivel plate 9.The center of this swivel plate 9 is connected the bottom surface that connects heating clamber 2 (baking box 1) and on the rotating shaft 10 that is provided with, RT motor 11 (with reference to Fig. 2) rotation that this rotating shaft 10 constitutes by outer bottom one side that is arranged on heating clamber 2 drives.Thereby, constitute driving mechanism by this RT motor 11 and rotating shaft 10 etc.This RT motor 11 is also controlled by above-mentioned control circuit 4.In addition, swivel plate 9 is driven by RT motor 11 and rotates to (for example overlook and be clockwise direction) along folk prescription with constant speed.

In addition, as at Fig. 3, cut open in 4,6 shown in the part like that, at the upper part of above-mentioned swivel plate 9, the food holding tray (rotating disk) 12 heat resistant glass system or the pottery system that can unload is being set, on food holding tray 12, place food F.Thereby swivel plate 9 is by food holding tray 12 support food F.In addition, above-mentioned excitation mouth 7 is arranged on than on the high slightly position of swivel plate 9.In addition, when carrying out the cooking of toast bread for example etc., take out above-mentioned food holding tray 12 from swivel plate 9, its swivel plate 9 uses as Roast net.

Above-mentioned swivel plate 9 specifically as shown in Figure 5, in circular frame 9a, constitute have integratedly many vertical excellent 9b and with the mesh shape of many horizontal bar 9c of its quadrature.In addition, heart part is being provided with the cam portion 9d that is connected to above-mentioned rotating shaft 10 therein.At this moment, above-mentioned vertical excellent 9b almost extends to (being fore-and-aft direction in Fig. 5) along folk prescription all continuously, along the left and right directions among Fig. 5 uniformly-spaced to be provided with.On the other hand, above-mentioned horizontal bar 9c almost all is arranged to disjunction and is the form less than 1/2 the length dimension of microwave wavelength λ (about 122mm).

In this case, form the opening portion 9e of the rectangular shape of the fore-and-aft direction among several long edge Fig. 5 by vertical excellent 9b and horizontal bar 9c with size much at one, these opening portions 9e is arranged to the form left and right directions in the drawings of the half interval that respectively staggers along its length arranged side by side.Point out that in passing the longitudinal size a of above-mentioned opening portion 9e is taken as greater than λ/2 64mm for example, lateral dimension b is taken as less than λ/4 30mm for example.Thus, swivel plate 9 becomes non-homogeneous shape along direction of rotation, in addition, is taken as in the present embodiment for central point and is point symmetry (even Rotate 180 degree also for identical shaped).

And as shown in Figure 6, the precalculated position at the frame 9a of swivel plate 9 is being provided with photo-emission part and is dividing 13.Relative therewith, at the sidewall sections of heating clamber 2, the optical sensor 14 as the reflection-type that has luminous component 14a and sensitization part 14b side by side of the stop position detection device of the reference position of detecting above-mentioned swivel plate 9 is being set.In the present embodiment, for example the reference position of the fore-and-aft direction consistent location of the direction of vertical excellent 9b extension and heating clamber 2 as swivel plate 9, when above-mentioned photo-emission part divides 13 stop positions that are arranged on swivel plate 9 to arrive the reference position, divide 13 reflections by this photo-emission part and by the position of sensitization part 14b sensitization from the emission light of above-mentioned beam split part 14a.As shown in Figure 2, the detection signal of this optical sensor 14 is input in the above-mentioned control circuit 4.

Above-mentioned control circuit 4 is according to the input signal from aforesaid operations panel 3, control magnetron 5 and RT motor 11 etc. carry out cooking, details is as narrating in the Action Specification of back, and the rotation of controlling above-mentioned swivel plate 9 makes carries out the heating of the kind (cooking menu) corresponding to food F.Thereby this control circuit 4 plays the effect of control device.

At this moment, in the present embodiment, when having selected predetermined food species (" heating rice " and " canned wine "), carry out the static heating mode that makes swivel plate 9 stop the rotation and heat at predetermined stop position (anglec of rotation).In addition, at this moment set the stop position that a plurality of swivel plates 9 stop the rotation according to its food species.More specifically say, when at food species being " heating rice ", shown in Fig. 4 (a), swivel plate 9 stops at the position of the angle A of advancing from the reference position, when being " canned wine " at food species, shown in Fig. 4 (b), swivel plate 9 stops at the position of the angle B of advancing from the reference position.

And, for swivel plate 9 is stopped at arbitrarily on the position, control circuit 4 is stored in advance and is made swivel plate 9 anglec of rotation A and angle B required conduction time for RT motor 11 (T (A) and T (B)), swivel plate 9 is rotated continuously, from detected the moment of reference position by above-mentioned optical sensor 14, only drive rotation RT motor 11, it is stopped in its conduction time.

In addition, in the present embodiment, when at food species being " cooking of thawing ", though it is not shown, swivel plate 9 is stopped at advance the position of angle C (to T conduction time (C) of RT motor 11) to carry out the heating of the scheduled time yet carry out, the compound heating mode that the residue subsequently makes swivel plate 9 heat in the rotation continuously heat time heating time from the reference position.And then, when the food species of having selected beyond the above-mentioned predetermined food kind, carry out the rotation heating mode that swivel plate 9 is heated rotation the time continuously.

Secondly, the effect of said structure also is described with reference to Fig. 1.If supply with the microwave of predetermined wavelengths from excitation mouthfuls 7 in heating clamber 2, then the size (position of wall) according to heating clamber 2 produces predetermined standing wave, results from this standing wave, will produce power (size of heat energy) inhomogeneous of electric field in heating clamber 2.But, because the bottom in heating clamber 2, being provided with the conductive material formation is the swivel plate 9 of non-homogeneous shape along direction of rotation, so rotation (change of stop position) according to this swivel plate 9, the reflection of microwave or the state of transmission change, and can access different Electric Field Distribution and then heating branch city in heating clamber 2.

Especially, in the swivel plate 9 of present embodiment, owing to have along folk prescription to the vertical excellent 9b of continuous extension with less than the horizontal bar 9c of 1/2 length of microwave wavelength λ, so the folk prescription that the wall electric current that flows through swivel plate 9 extends along vertical excellent 9b is to by rectification, be that the stop position Electric Field Distribution of swivel plate 9 changes according to its flow direction.And, because opening portion 9e, when intersecting with it, be easy to by microwave for the length direction of the direction of advance opening portion 9e of microwave with rectangular shape, be difficult to by ripple when consistent little in the direction of advance of microwave with the length direction of opening portion 9e.

Thus, can obtain the Electric Field Distribution of feature, strengthen the variation of Electric Field Distribution of the stop position change of accompanying rotation plate 9 fully, promptly increase the pattern that adds heat distribution according to the stop position of swivel plate 9.Thereby by rotating this swivel plate 9 continuously, great changes will take place in time owing to the Electric Field Distribution in the heating clamber 2, adds that food F self also rotates, so can not heat unevenly heat food F equably.

Yet, though the homogenising of such Electric Field Distribution is suitable at the roomy bigger food of flat heated direction (a plurality of steamed dumplings with the dough gathered at the top and Pizza etc.), but for example under the situation of canned wine, because convection current, the heating of the so-called top of generation being crossed the above-below direction that heats doughtily is inhomogeneous.In addition, from the viewpoint of the efficiency of heating surface, for example under the situation of heating rice etc., will produce the low undesirable condition of the efficiency of heating surface.That is,, make swivel plate 9 stop at predetermined stop position sometimes with it according to food species, more suitable not as good as heating unchangeably with predetermined Electric Field Distribution former state.

Promptly, shown in Fig. 4 (a), by swivel plate 9 being stopped at advance the stop position of angle A from the reference position, when " heating rice ", can obtain the Electric Field Distribution of the best efficiency of heating surface, shown in Fig. 4 (b), by swivel plate 9 being stopped at advance the stop position of the angle B different with above-mentioned angle A from the reference position, when carrying out the heating of " canned wine ", can access not produce and heat uneven (force hot bottom and can heat along the vertical direction equably) Electric Field Distribution up and down according to convection current.

In addition, when " cooking of thawing ", swivel plate 9 is stopped at advance the stop position of angle C to carry out the heating of the scheduled time from the reference position, then by make swivel plate 9 (food F) continuously rotation heat, can carry out the efficiency of heating surface and well and not heat uneven heating.(angle A, B C) are for example tried to achieve by experiment in advance to access like this stop position corresponding to the swivel plate 9 of the best Electric Field Distribution of food species.In addition, these angle A, it is the most effective when being placed on the central part of swivel plate 9 (food holding tray 12) that B, C are set to a food F.

Thereby, in the present embodiment, shown in the flow process of Fig. 1, carry out control by the swivel plate 9 of control circuit 4 enforcements.That is,, select cooking menu (kind of food F) if the user has operated guidance panel 3, and closed initiate key (step S1), then magnetron 5 is driven beginning cooking (step S2).And, meanwhile, by the control of the step below step S3 swivel plate 9.

At this moment, at first, judge that whether the cooking menu selected by the user is the cooking menu be scheduled to (being " heating rice " in this case, " canned wine ", " cooking of thawing " some) (step S3).When being cooking menu (for example " steamed dumpling with the dough gathered at the top heating " etc.) beyond the cooking menu be scheduled to (denying), implementation making swivel plate 9 rotate (step S4) continuously, the cooking that the rotation heating mode that heats when food F rotates in heating clamber 2 is carried out.

In contrast, when being the cooking menu of being scheduled to (being among the step S3), the detection action (step S6) of the reference position of being undertaken by above-mentioned optical sensor 14 is carried out in the rotation (step S5) of beginning swivel plate 9.And, if detect the reference position (being among the step S6) of swivel plate 9, subsequently, carry out different control (step S7) according to each cooking menu, when cooking menu is " heating rice ", shown in Fig. 4 (a), swivel plate 9 is detected constantly begin to stop at behind the rotational time T (A) position (step S8) of angle A of advancing from the reference position from the reference position.

And, at cooking menu when being " canned wine ", shown in Fig. 4 (b), swivel plate 9 is detected constantly begin to stop at behind the rotational time T (B) position (step S9) of angle B of advancing from the reference position from the reference position.Like this, at cooking menu when being " heating rice " or " canned wine ", carry out the static heating mode that heats swivel plate 9 is stopped the rotation corresponding to the predetermined angular A of the kind of these food F or B.If passed through the predetermined cooking time, then finish the cooking (step S10).

In addition, when cooking menu is " cooking of thawing ", at first, swivel plate 9 is detected constantly begin to stop at behind the rotational time T (C) position (step S11) of angle C of advancing from the reference position from the reference position, carry out in this state after the heating (step S12) of the scheduled time, switch to when making swivel plate 9 rotate (step S13) continuously and carry out the heating (step S14) of remaining time, and then carry out compound heating mode.

If like this according to present embodiment, by the swivel plate 9 that is made of conductive material is constituted non-homogeneous shape along direction of rotation, change by its stop position, can in heating clamber 2, obtain different Electric Field Distribution, be conceived to this point, constitute the feasible heating of carrying out corresponding to cooking menu (food F kind) of control of the stop position of controlling swivel plate 9.Its result, when can carry out the effective heating corresponding to food F kind, can also not heat the uneven cooking of well finishing situation, and, since only the control of the stop position by swivel plate 9 just can realize the raising efficiency of heating surface as described above and improve heat inhomogeneous, can be with the simple structure outstanding like this practical function of just dealing with problems so can access.

In this case, especially in the present embodiment, because 2 kinds of foods are implemented to make the heating mode that stops that swivel plate 9 stops with different respectively angle, meanwhile, in other cooking menu, adopt compound heating mode, so increased the pattern that adds heat distribution with the rotation heating mode, can select the abundant heating mode of kind, range of choice when having increased the heating of carrying out corresponding to food species can further improve and the efficiency of heating surface is risen and improves the uneven effect of heating.

In addition, in the present embodiment, constitute when detecting the reference position of swivel plates 9 by optical sensor 14, control the stop position of this swivel plate 9 from the rotation driving time of this reference position according to swivel plate 9, so,, also can make swivel plate 9 stop at predetermined stop position reliably even set a plurality of stop positions that swivel plate 9 is stopped, and having can be the advantage that simplifies the structure that the stop position that is used for swivel plate 9 detects and stop position is controlled.

In addition, in the present embodiment, by along folk prescription to the vertical excellent 9b of continuous extension with constitute the network of swivel plate 9 inside less than the horizontal bar 9c of 1/2 the length dimension of microwave wavelength λ, form the opening portion 9e of several rectangular shape simultaneously, so the variation of the Electric Field Distribution that is accompanied by the change of swivel plate 9 stop positions can be set at fully big.

In addition, in the above-described embodiments, for " heating rice ", " canned wine ", " cooking of thawing " 3 kinds cooking menus constitute and carry out static heating mode or compound heating mode, yet only also can constitute at a kind of cooking menu implementation still-mode when " canned wine " for example, otherwise, also can constitute for more kinds of cooking menus, carry out the static heating mode that carries out different stop positions etc. according to each.In this case, can set compound heating mode as required.In addition, as the structure of swivel plate 9 (shape of network and at interval, the size of opening portion etc.),, then all distortion can be arranged so long as be non-homogeneous shape along direction of rotation.

(2) the 2nd～the 7th embodiment

Then, with reference to Fig. 7～Figure 12 the 2nd～the 7th embodiment of the present invention is described in proper order.In addition, the embodiment of the following stated can be described as the variation of above-mentioned the 1st embodiment, and its essential part is identical with above-mentioned the 1st embodiment.Thereby, mark identical label and omit detailed explanation and new diagram for the part identical with above-mentioned the 1st embodiment, below, only describe for its characteristic point.

Fig. 7 illustrates the present invention the 2nd embodiment (corresponding to scheme 2), is the flow chart that the rotation control sequence of swivel plate 9 is shown.This embodiment and above-mentioned the 1st embodiment dissimilarity are to judge automatically the kind (cooking menu) of food F.That is, if, then begin heating (step S21) by the closed firing switch of user, the automatic judgement (step S22) of cooking menu then, below, carry out identical control (step S3～S14) with above-mentioned the 1st embodiment.

In this case, though omitted detailed explanation, the automatic judgement of above-mentioned cooking menu is to use gas sensor (alcohol sensor, vapor sensor) and weight sensor and shape sensor etc. to carry out.Should automatically judge needed time at 10 seconds with interior very short.If according to the 2nd embodiment, then can access effect and the effect identical with above-mentioned the 1st embodiment.

Fig. 8 illustrates the 3rd embodiment of the present invention (corresponding to scheme 7).In this embodiment, stop position detection device as the reference position of detecting swivel plate 9, the optical sensor 14 that replaces the reflection-type among above-mentioned the 1st embodiment, use have disposed the optical sensor 21 of the transmission-type of luminous component 21a and sensitization part 21b relatively in the bight of the inboard of heating clamber 2.And, at this moment, outside the precalculated position of the outer peripheral edge portion of swivel plate 9, be provided with to the outstanding projection 22 of peripheral direction.In such structure, the reference position of swivel plate 9 is arranged on the optical axis between luminous component 21a and the sensitization part 21b and projection 22 positions that intersect, and can detect the reference position of this swivel plate 9 by optical sensor 21.

Fig. 9 illustrates the 4th embodiment of the present invention (corresponding to scheme 8).Among this embodiment, when the pre-position of the outer peripheral edge portion of swivel plate 9 is provided with magnet 23,, be provided as the Magnetic Sensor 24 of Hall element etc. of the stop position detection device of the reference position that is used to detect swivel plate 9 in the wall portion of heating clamber 2.Even in such structure,, also can detect the reference position of swivel plate 9 by detecting magnet 23 with Magnetic Sensor 24.

Figure 10 illustrates the present invention the 5th embodiment (corresponding to scheme 9).Here, swivel plate 9 is connected to the upper part of the rotating shaft 25 that is driven by 11 rotations of RT motor, in the present embodiment, the top 25a of this rotating shaft 25 is formed section (upper surface) rectangular shape, constitute swivel plate 9 and be connected to the preset rotating direction position for this rotating shaft 25.And, in below one side of heating clamber 2 (baking box 1) base plate, on rotating shaft 25, be provided with to the outstanding cam 26 of peripheral direction, the switch 27 by these cam 26 actions is set simultaneously, constitute stop position detection device.

In such structure,, similarly be rotated the control of the stop position of plate 9 to the position probing that makes switch 27 actions by cam 26 by being the reference position of swivel plate 9.Thus, the mechanism of the stop position of swivel plate 9 can be used to detect, the benefit of directions such as associativity and hear resistance can be accessed in the outer setting of heating clamber 2.As the shape of the upper part of rotating shaft 25, remove beyond the section rectangle, can also be various distortion such as oval and so-called D cut-out.

In addition, make swivel plate 9 stop at the method for predetermined stop position, be not limited to detect the method that time control is carried out in above-mentioned reference position as being used to.

For example,, can constitute then that sensor obtains detection signal when swivel plate 9 is positioned at this stop position, rotation is stopped if stop position is 1.At swivel plate 9 is under the point-symmetric situation, and the retrieve position at 2 places can be set at per 180 degree.Under the situation that has a plurality of stop positions, can constitute a plurality of switches (sensor) are set in each position.In addition, even 1 switch also can make swivel plate 9 stop on a plurality of stop positions by the number of times of resultant signal.And then, also can constitute according to direct anglecs of rotation that detects swivel plate 9 (rotating shaft 10,25) such as encoders.

In addition, direction of rotation at the motor that drives swivel plate 9 can not be defined as under unidirectional situation, if the centre of said reference set positions in stop position and point-symmetric position, make swivel plate 9 begin constantly to revolve to turn 90 degrees from the detection of reference position, then no matter along making swivel plate stop at predetermined stop position under the situation of which direction rotation.

Figure 11 illustrates the 6th embodiment of the present invention (corresponding to scheme 10).Here, as mentioned above, promptly allow to the heat distribution that adds in the heating clamber 2 is taken as the best distribution that is adapted to cook menu, but for especially little food F, if this food F is not placed into the suitable location on the food holding tray 12, can not obtain fully adding the effect that heat distribution produces by it.

So, in the present embodiment, at the upper surface that is arranged at the food holding tray 12 on the swivel plate 9, represented to show the mark 28,29 of the position that is suitable for placing food F.

In this case, mark 28,29 is respectively by expression " rice ", and the pattern of " wine " constitutes.In addition, at this moment, food holding tray 12 is set to the predetermined direction of rotation position with respect to swivel plate 9, and this is self-evident.Thus, the user can be placed into food F and can fully obtain by on the position that adds the effect that heat distribution produces.

Figure 12 illustrates the 7th embodiment of the present invention (corresponding to scheme 11).Among this embodiment, the mark 28,29 that replaces the pattern among above-mentioned the 6th embodiment to form, by upper surface point of irradiation light 30 at food holding tray 12, the position that expression is suitable for placing food F.If the structure according to such can be easy to carry out eye-catching demonstration with judging.

(3) the 8th embodiment

Secondly, narrate the 8th embodiment of the present invention (corresponding to scheme 13,14,15,16,17,18) with reference to Figure 13 to Figure 16.At first, Figure 13 illustrates the structure of the swivel plate 31 in the present embodiment.This swivel plate 31 for example still constitutes and to carry out enamel on the surface of the conductive material of steel plate etc. and handle, and whole profile is the circular flat disk shape and is non-homogeneous shape (becoming point symmetry shape for central point) along direction of rotation.

Concretely, swivel plate 31 constitutes in annular frame 31a, integrally have many vertical excellent 31b and with the network of a plurality of horizontal bar 31c of its quadrature.In addition, part is provided with the cam 31d that is connected to rotating shaft 10 (with reference to Figure 15) in the central.At this moment, above-mentioned vertical excellent 31b extends to (being fore-and-aft direction the figure) continuously from the end to another end along folk prescription in frame 31a, and left and right directions is set to almost equidistant in the drawings.On the other hand, above-mentioned horizontal bar 31c almost is set to be divided the form that is broken into less than 1/2 the length dimension of microwave wavelength λ (about 122mm) all.

At this moment, in the present embodiment,, form a plurality of (surround 4 of cam 31d and 2 before and after it and amount to 6) almost foursquare central opening part 32 with vertical excellent 31b and horizontal bar 31c at the middle body of swivel plate 31.The size in length and breadth of this central opening part 32 all is set at 1/4 31mm for example greater than microwave wavelength λ.And then, at the close outer peripheral portion (position, the left and right sides among the figure of formation central opening part 32) of swivel plate 31, form the opening portion 31e of the rectangular shape of fore-and-aft direction among several long edge figure with size much at one.This opening portion 31e is identical with above-mentioned the 1st embodiment, and longitudinal size a is taken as greater than λ/2 64mm for example, and lateral dimension b is less than λ/4 30mm for example.

And, as Figure 14 and shown in Figure 15, right side wall portions at heating clamber 2, be provided with and passing through waveguide 33 (with reference to Figure 15) microwave from magnetron 5 vibration is supplied to excitation mouth 34 in the heating clamber 2, this excitation mouthfuls 34 is arranged to the height dimension d of the above-mentioned swivel plate 31 of distance less than 1/2 of microwave wavelength.In addition, as shown in figure 15, the 33a of wall portion that the lower end connected of the excitation mouth 34 of the exit portion of above-mentioned waveguide 33 constitutes towards this excitation mouthful shape that 34 declines are tilted.And then in the present embodiment, as shown in figure 15, at the bottom surface portions of heating clamber 2, formation becomes the bump 35 of mountain font (mild taper shape) protuberance corresponding to the position of the middle body of swivel plate 31.

In such structure, owing to formed central opening part 32 at the middle body of swivel plate 31, microwave is easy to see through by its central opening portion 32 middle body of swivel plate 31.Thus, the transmissivity to swivel plate 31 central parts top of the microwave of reflection heating clamber 2 bottom surfaces increases, and can heat the food F that is positioned at swivel plate 31 (food holding tray 12) central part more strongly.

In this case, because excitation mouth 34 is arranged on lower position, enter between the bottom surface of swivel plate 31 and heating clamber 2 so can easily make from excitation mouthful 34 microwaves of in heating clamber 2, supplying with, and, constitute the shape of inclination that descends owing to be connected to the 33a of wall portion of excitation mouth 34 lower ends of waveguide 33, so the microwave that supplies in the heating clamber 2 is directed to the below, further is easy to enter between the bottom surface of swivel plate 31 and heating clamber 2.And then, owing on the bottom surface of heating clamber 2, be provided with and fallen part 35, so the microwave of bottom surface portions that enters into heating clamber 2, can further promote the seeing through of microwave of the middle body of swivel plate 31 by the bump 35 middle body guiding top through swivel plates 31.

In addition, identical with the swivel plate 9 of above-mentioned the 1st embodiment, swivel plate 31 has continuously along folk prescription to the vertical excellent 31b that extends with less than the horizontal bar 31c of 1/2 length of microwave wavelength λ, but also the opening portion 31e with rectangular shape.So, can access the Electric Field Distribution of feature according to the stop position of swivel plate 31, can obtain the variation of the Electric Field Distribution of accompanying rotation plate 31 stop positions change very big.

In addition, the present invention does not limit above-mentioned present embodiment, can suitably change enforcement in the scope that does not break away from main points.

In this case, though do not illustrate, yet in the various embodiments described above, make swivel plate 9 in implementation, 31 when stopping at the static heating mode of predetermined stop position heat food F, can also control, feasible certain of carrying out in its process makes the action (corresponding to scheme 19) of stopping the rotation behind swivel plate 9, the 31 Rotate 180 degree constantly.

Thus, even very strong from the irradiation for the microwave of the one side of food F, the opposite one side of food F becomes under the situation of the so-called back, and food F becomes the form of turning over turnback in heating process, can make the irradiation equalization of microwave for two faces.In addition at this moment, because swivel plate 9,31 makes the point symmetry shape, so the pattern that can not change Electric Field Distribution heats with the Electric Field Distribution of the best.

As from the above description clear and definite, if according to micro-wave oven of the present invention, setting Swivel plate in the support food of bottom of heating chamber constitutes non-by conductive material along direction of rotation Uniform shapes simultaneously, is controlled so that carry out corresponding to food at the stop position of swivel plate The control device of heating, add so can when seeking to improve the efficiency of heating surface, seek to improve Heat is inhomogeneous, and have can be with the simple structure so outstanding effect of just can dealing with problems Really.

Claims (19)

1. micro-wave oven is characterized in that having:

Heating clamber, in this heating clamber, supply with the microwave feeding means of microwave, constitute non-homogeneous shape and be arranged on the swivel plate of the bottom support food in the above-mentioned heating clamber along direction of rotation with conductive material, rotation drives the driving mechanism of this swivel plate, controls to make on the stopping of above-mentioned swivel plate position carry out the control device corresponding to the heating of food.

2. micro-wave oven as claimed in claim 1 is characterized in that,

Control device stops at corresponding to by the predetermined stop position of food species user input or that differentiate automatically and heat swivel plate.

3. micro-wave oven as claimed in claim 1 or 2 is characterized in that,

Have the rotation heating mode that makes swivel plate rotation time heat food and swivel plate is stopped the rotation carry out the static heating mode of heat food, select these heating modes according to the kind of food at predetermined stop position.

4. as each described micro-wave oven of claim 1 to 3, it is characterized in that,

Carry out compound heating mode according to the kind of food, this pattern is the pattern that the mode combinations of carrying out the food heating when carrying out the pattern of food heating under the state of the plate that stops the rotation at predetermined stop position and making above-mentioned swivel plate rotation is got up.

5. as each described micro-wave oven of claim 1 to 4, it is characterized in that,

Stop position detection device with the stop position that detects swivel plate, control device is according to the stop position of the testing result control swivel plate of this stop position detection device.

6. micro-wave oven as claimed in claim 5 is characterized in that,

Stop position detection device constitutes and detects the swivel plate reference position, and simultaneously, the control device basis makes this swivel plate stop at preposition from the rotation driving time of the reference position of above-mentioned swivel plate.

7. micro-wave oven as claimed in claim 5 is characterized in that,

Stop position detection device constitutes with optical sensor.

8. micro-wave oven as claimed in claim 5 is characterized in that,

Stop position detection device constitutes with Magnetic Sensor.

9. as each described micro-wave oven of claim 5 to 8, it is characterized in that,

Stop position detection device connects swivel plate according to detection and makes the angle of the rotating shaft of this swivel plate rotation in predetermined direction of rotation position, detect the stop position of swivel plate indirectly.

10. as each described micro-wave oven of claim 1 to 9, it is characterized in that,

At swivel plate or be arranged on the mark that shows the position that is suitable for placing food is shown on the food mounting dish on the swivel plate.

11. micro-wave oven as claimed in claim 10 is characterized in that,

The demonstration of mark is finished by the irradiation of a light.

12. each the described micro-wave oven as claim 1 to 11 is characterized in that,

The swivel plate structure is for having vertical rod and network-like with the horizontal bar of its quadrature in frame, wherein, vertical rod extends along a direction continuously, and simultaneously, horizontal bar is 1/2 length of every curtailment microwave wavelength by disjunction.

13. each the described micro-wave oven as claim 1 to 12 is characterized in that,

The swivel plate structure is for having vertical rod and latticed with the horizontal bar of its quadrature in frame, the position has in length and breadth all the central opening part greater than 1/4 length dimension of microwave wavelength in the central.

14. micro-wave oven as claimed in claim 13 is characterized in that,

The excitation mouth that is used in heating clamber supplying with microwave be arranged on heating clamber sidewall sections apart from the height of swivel plate 1/2 position less than microwave wavelength.

15. the described micro-wave oven of claim 14 is characterized in that,

Connection is made the wall portion of the bottom of the excitation mouth of the exit portion of the waveguide in the microwave importing heating clamber towards this excitation mouthful shape that decline is tilted.

16. each the described micro-wave oven as claim 13 to 15 is characterized in that,

The position that the bottom surface portions of heating clamber is made corresponding to the middle body of swivel plate becomes the shape that the mountain font swells like that.

17. each the described micro-wave oven as claim 13 to 16 is characterized in that,

On part, have vertically greater than 1/2 of microwave wavelength, laterally less than the opening portion of 1/4 rectangular shape of microwave wavelength near the periphery of swivel plate.

18. each the described micro-wave oven as claim 13 to 17 is characterized in that,

The vertical rod of the grid of swivel plate extends continuously along a direction from the end to the end and is arranged in the frame.

19. each the described micro-wave oven as claim 13 to 18 is characterized in that,

Control device stops the rotation the rotation of plate when food is heated at predetermined stop position, at least once makes the action that stops behind the above-mentioned swivel plate Rotate 180 degree.

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