JP3640932B2 - microwave - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a microwave oven provided with a communication means and a communication antenna.
[0002]
[Problems to be solved by the invention]
Recently, in a microwave oven, a home wireless communication network (hereinafter referred to as a home wireless LAN) is used between a microwave oven and a home terminal (so-called home terminal) in order to obtain information on heating control or cooking recipes and methods. It is considered that the home terminal obtains the above information from the server via the public line and the Internet and transfers it to the microwave oven.
[0003]
Then, in the microwave oven, as shown in FIG. 21 for communication, a communication device 2 serving as a wiring means is provided at the bottom on the rear side of the inside of the range body 1, and the antenna penetrates through the metal bottom plate 1a. 3 is considered.
[0004]
However, since the antenna 3 is provided in the rear part of the range main body 1 in the above-described conventional configuration, there is a risk of being affected by transmission and reception when there are other electrical devices (metal devices) around the range main body 1. is there. In particular, metal devices are often arranged on the upper and lower sides of the range body 1. Moreover, since a part of the antenna 3 is located very close to the metal bottom plate 1a of the range body 1, it is also expected that transmission / reception is affected.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a microwave oven that can always perform good transmission and reception and obtain a stable communication function.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a range body configured with a door on the front surface of the main body box;
A communication means provided in the range body for communicating information including cooking information;
An antenna for performing this communication wirelessly,
Both the doors have a frame portion made of synthetic resin and a front plate portion attached thereto, and a metal portion for radio wave shielding provided on the back side of the front plate portion,
The antenna is provided in a frame portion of the door, and is connected to the communication means by a coaxial cable.
The coaxial cable is characterized in that the shield wire is electrically connected to the radio wave shielding metal portion .
[0007]
In the microwave oven, no other equipment is arranged on the front surface of the range body, and the front surface of the range body is formed of a non-metal, for example, synthetic resin, with a frame portion and a front plate portion. There is a door. The present invention focuses on this point.
According to the first aspect of the present invention, since the antenna is provided on the frame of the door of the range body, it is not affected by other devices arranged in the vicinity of the range body, and transmission and reception are not affected by the metal part of the range body. Can be performed. Further, the radio wave shielding metal part can be grounded, and the radio wave shielding metal part can be used for an antenna, and radio waves can be transmitted and received satisfactorily.
[0008]
The invention of claim 2 is characterized in that a synthetic resin handle is provided on the door frame and an antenna is provided on the handle. According to this, it becomes possible to effectively transmit and receive at the portion where the radio wave is most easily transmitted and received in the range body.
[0010]
The invention of claim 3 is characterized in that the antenna is formed on a circuit board. According to this, an inexpensive and highly reliable antenna can be formed, which can contribute to an improvement in transmission and reception and a reduction in overall cost.
The invention of claim 4 is characterized in that the antenna is provided so that the direction can be changed. According to this, the antenna can be set in a direction in which radio wave transmission / reception is favorable, and the improvement in transmission / reception can be further enhanced.
[0011]
The invention of claim 5 is characterized in that the antenna is formed on a circuit board on which an electrical component is mounted. According to this, the circuit board can be shared by the electrical component and the antenna, and the number of parts and the number of manufacturing steps can be reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows a home terminal 10 (information terminal) and a microwave oven 11 capable of communicating with the home terminal 10 (information terminal). Both of them are equipped with a Bluetooth (registered trademark) interface as a short-range wireless communication means, and communicate with each other via a radio signal in the 2.4 GHz band. The home terminal 10 can select a cooking menu or the like, and downloads information corresponding to the selected cooking menu via the public line and the Internet and transfers it to the microwave oven 11, or the microwave oven 11 side When there is a request for downloading a cooking menu or the like, it can be downloaded as described above.
[0014]
Now, the microwave oven 11 is provided with the range main body 12, which is provided on the front surface of the main body box 13 and the main body box 13 both composed of an outer box 13a made of a metal plate and an inner box (not shown). It has a door 14 and an operation panel 15. The inside of the main body box 1 is a heating chamber. A leg 12 a is provided at the lower portion of the range body 12.
[0015]
The door 14 includes a frame portion 14a formed of a nonmetal such as a synthetic resin , a front plate portion 14b attached to the frame portion 14a, and a metal portion for radio wave shielding with a certain distance (for example, about 3 cm) on the back side thereof. A punching metal 14c and a transparent plate portion 14d are provided. A transparent portion 14e is formed on the front plate portion 14b by, for example, two-color molding.
[0016]
As shown in FIGS. 1 to 3, the door 14 is provided with a handle 16 on the upper portion of the frame portion 14a . The handle 16 has left and right synthetic resin mounting portions 16a attached to the frame portion 14a . 16b and a synthetic resin handle 16c spanned between the two.
The operation panel 15 is attached to the front portion of the outer box 13a as shown in FIGS. 3 and 4, and is made of synthetic resin. The mounting portions 16a and 16b and the handle portion 16c are hollow. A circuit board 17 on which various electrical components are mounted is disposed on the back side of the operation panel 15. The circuit board 17 is provided with an LCD display 18, an LED group 40, a switch group 28, and the like which will be described later. The operation panel 15 includes a transparent LCD display unit 15a, an LED display unit / switch operation sheet unit 15b, and the like.
[0017]
FIG. 5 shows the electrical configuration in blocks. The control circuit 19 is configured to include a microcomputer, and a temperature sensor for detecting the temperature in the heating chamber receives a detection signal of the weight sensor 20 for detecting the weight of the food via the weight interface 21. For example, the detection signal of the thermistor 22 is input via the thermistor interface 23, the detection signal of the infrared sensor 24 comprising a plurality of infrared temperature detection elements for detecting food temperature is input via the infrared sensor interface 25, and the key encoder 26 A pulse signal is input via the interface 27, and a switch signal of the switch group 28 is input via the interface 29. The key encoder 26 is rotated by a dial 26a provided on the operation panel 15 to set cooking time and cooking temperature.
[0018]
The control circuit 19 controls each device by an operation program stored in a memory of the microcomputer or an external memory or an operation program transferred from the home terminal 10, that is, for microwave heating of food. A cooling fan for controlling the magnetron 30 through an inverter interface 31 and an inverter 32 as a magnetron driving circuit, and controlling an oven heater 33 for heating food through a heater driving circuit 34 to cool devices such as the magnetron 30. 35 is controlled via the fan drive circuit 36, the buzzer 37 is controlled via the buzzer drive circuit 38, the LCD display 18 is controlled via the LCD drive circuit 39, and the LED group 40 is controlled via the LED drive circuit 41. Control through. Further, the control circuit 19 communicates with the home terminal 10 via the communication interface 42 and the communication adapter 43 as communication means.
[0019]
As shown in FIG. 6 , the communication adapter 43 includes a transmission / reception switching circuit 44, a reception circuit 45, an encoding circuit 46, a transmission circuit 47, and a decoding circuit 48. Further, an antenna 49 is connected to the communication adapter 43.
The circuit board 17 is mounted with a large number of electrical components including an LCD display 18 and a control circuit 19. In FIG. 5, reference numeral 17 indicates a circuit board, but is not an actual shape but an electrical component mounted on the circuit board 17.
[0020]
The antenna 49 is configured using a coaxial cable 50 which is a connection line. That is, as shown in FIG. 1, in the coaxial cable 50, a core wire 51, which is a linear strip conductor, is covered with a covering material 52, and a shield wire 53, which is a mesh conductor, is disposed on the outer peripheral surface of the covering material 52. The shield wire 53 is covered with a covering material 54. The coaxial cable 50 is led out from the communication adapter 43, led from the lower part of the door 14 to the upper part of the door 14 through the inside, and an antenna 49 is constituted by the tip part.
[0021]
That is, the antenna 49 is connected to the punching metal 14c with the shield wire 53 through the metal fitting 55 made of a conductor for grounding, and the core wire 51 is penetrated through the frame portion 14a (made of synthetic resin). It is comprised in the form protruded in 16 attachment parts 16a (this is also a product made from a synthetic resin). The antenna 49 belongs to a so-called linear antenna.
[0022]
According to such a present Example, since the antenna 49 was provided in the front part of the range main body 12, it was not influenced by the other apparatus arrange | positioned in the vicinity of the range main body 12, and it was not influenced by the metal part of the range main body 12. Can be transmitted and received.
[0023]
In particular, in this embodiment, the frame portion 14a and the front plate portion 14b of the door 14 are formed of synthetic resin, the handle 16 made of synthetic resin is provided on the door, and the antenna 49 is provided on the handle 16. The range body 12 can effectively transmit and receive at the portion where radio waves are most easily transmitted and received.
[0024]
Further, since the antenna 49 is configured using the coaxial cable 50, the configuration is simplified, and since the shield wire 53 of the coaxial cable 50 is electrically connected to the punching metal 14c which is a radio wave shielding metal portion, the punching metal 14c. Can be used for the antenna 49, and radio waves can be transmitted and received satisfactorily.
[0025]
8 and 9 show a second embodiment of the present invention. In this embodiment, the configuration and setting location of the antenna 61 are different from those of the first embodiment. The antenna 61 is provided in the handle portion 16 c of the handle 16. In this case, the antenna 61 is configured such that a linear conductor 62 is connected to the shield wire 53 via a connector 63, and the linear conductor 62 and the core wire 51 are disposed so as to extend in opposite directions. This is a type called a dipole antenna among so-called linear antennas. The connector 63 is connected to a ground wire (not shown). Also by this, the same effect as the first embodiment can be obtained.
[0026]
FIG. 10 shows a third embodiment of the present invention, which differs from the first embodiment in that an antenna 64 made of a dipole antenna is provided in the lower part of the door 14. According to this embodiment, the antenna 64 can satisfactorily transmit and receive radio waves through the front plate portion 14 b of the door 14.
[0027]
11 to 13 show a fourth embodiment of the present invention. This embodiment is different from the first embodiment in the following points. An antenna 65 made of a dipole antenna is provided on the back side of the operation panel 12 made of synthetic resin. That is, the antenna 65 is composed of conductor patterns 65 a and 65 b formed on the circuit board 66. Each of the conductor patterns 65a and 65b has a linear shape, and is formed in an arrangement shape that is substantially straight in the longitudinal direction.
[0028]
The core wire 51 of the coaxial cable 50 that connects the antenna 65 and the communication adapter 43 is electrically connected to one end of the conductor pattern 65a (end near the conductor pattern 65b), and the shield wire 53 is one end of the conductor pattern 65b (conductor). The conductive pattern 65b is connected to the ground at one end thereof. ing.
[0029]
According to the fourth embodiment, since the operation panel is made of synthetic resin and the antenna 65 is provided on the back surface side of the operation panel 15, the back surface of the operation panel 15 can be transmitted and received well. Assembly and wiring can be performed together with other electrical components. In addition, since the antenna 65 is formed on the circuit board 66, an inexpensive and highly reliable antenna can be formed, which can contribute to an improvement in transmission and reception and a reduction in the overall cost.
[0030]
In this case, as shown in FIG. 14 showing the fifth embodiment of the present invention, when a relatively wide space G exists above the circuit board 66, the circuit board 66 is centered on the axis 66a and the arrow A The antenna 65 may be configured to be capable of changing the direction by being provided so as to be rotatable in the direction. By doing so, it is possible to further improve the transmission / reception performance.
[0031]
FIG. 15 shows a sixth embodiment of the present invention. This embodiment differs from the first embodiment in the following points. That is, the antenna 67 is provided in the front part of the bottom plate 13a '(made of a metal plate) of the outer box 13a which is a metal part of the range body 12. The antenna 67 is configured as follows. The core wire 51 of the coaxial cable 50 is electrically connected to one end portion of the conductor pattern 69 of the circuit board 68, and the shield wire 53 is electrically connected to the bottom plate 13a 'via the mounting bracket. In this case, the mounting bracket 70 is for mounting the circuit board 68 together with another mounting bracket 71. In this case, a space is formed by the legs 12a below the bottom plate 13a ', and the antenna 67 is provided using this space.
[0032]
In the sixth embodiment, since the antenna 67 is provided on the bottom plate 13a 'of the front portion of the range body 12, the antenna 67 is located in a space where the bottom plate 13a' is possible and is disposed in the vicinity of the range body. Since the shield wire 53 is electrically connected to the bottom plate 13a ', which is a metal part, and is grounded without being affected by other devices, the metal portion of the range body 12 can be used for the antenna 67, and the metal of the range body 12 can be used. Transmission and reception can be performed without being affected by the portion.
In this case, as shown in FIG. 17 shown as the seventh embodiment of the present invention, the antenna may be composed of an antenna 72 composed of a dipole antenna having two conductor patterns 72a and 72b.
[0033]
FIG. 18 shows an eighth embodiment of the present invention. In this embodiment, the following point is the sixth embodiment (FIG. 16). An electric insulator 73 made of, for example, a synthetic resin is attached to the bottom plate 13a ′ of the range body 12 by mounting brackets 70 and 71. The antenna 74 connects the shield wire 53 of the coaxial cable 50 to the bottom plate 13a which is a metal part of the range body 12. 'And the core wire 51 of the coaxial cable 50 is fixed to an electrical insulator 73. In this case, a groove 73a is formed in the electrical insulator 73, and the core wire 51 is fitted in the groove 73a.
[0034]
According to this embodiment, the tip end portion of the coaxial cable 50 can be used as an antenna, and the core wire 51 is fixed to the electrical insulator 73, so that transmission and reception can be performed satisfactorily. In particular, since the groove 73a is formed in the electrical insulator 73 and the core wire 51 is fitted into the groove 73a, the shape retention is ensured.
[0035]
FIG. 19 shows a ninth embodiment of the present invention. This ninth embodiment is characterized in that the antenna 74 is provided on the circuit board 17 provided with the control circuit 19 and the like. Accordingly, the circuit board 17 can be shared by the electrical components such as the control circuit 19 and the antenna 74, and the number of parts and the number of manufacturing steps can be reduced.
In this case, the communication adapter 43 may also be provided on the circuit board 17 (see FIG. 20 shown as the tenth embodiment of the present invention).
The present invention is not limited to the above-described embodiments. For example, the antenna may be a patch antenna, and various modifications can be made without departing from the scope of the invention.
[0036]
【The invention's effect】
As is apparent from the above description, the present invention can always perform good reception and obtain a stable communication function.
[Brief description of the drawings]
FIG. 1 is a vertical side view of a mounting portion at an upper part of a door showing a first embodiment of the present invention. FIG. 2 is a perspective view of a home terminal and a microwave oven. FIG. 3 is a front view of a microwave oven. FIG. 5 is a block diagram of an electrical configuration in the LCD display portion of the operation panel. FIG. 6 is a block diagram of an electrical configuration related to a communication adapter. FIG. 7 is taken along line P-P in FIG. 8 is a cross-sectional view of the antenna portion of the handle. FIG. 10 is a cross-sectional view of the antenna according to the second embodiment of the present invention. 11 is a view corresponding to FIG. 3 showing a fourth embodiment of the present invention. FIG. 12 is a view corresponding to FIG. 4. FIG. 13 is a rear view seen from the direction of arrow Q in FIG. FIG. 15 is a diagram corresponding to FIG. 13 showing the embodiment of the present invention. FIG. 15 is a longitudinal section of the antenna portion of the bottom plate of the range body showing the sixth embodiment of the present invention. FIG. 16 is a perspective view thereof. FIG. 17 is a diagram corresponding to FIG. 16 showing a seventh embodiment of the present invention. FIG. 18 is a diagram corresponding to FIG. 16 illustrating an eighth embodiment of the present invention. FIG. 20 is a diagram corresponding to FIG. 5 showing a ninth embodiment of the invention. FIG. 20 is a diagram corresponding to FIG. 5 showing a tenth embodiment of the invention. FIG. 21 is a side view of a microwave oven showing a conventional example.
10 is a home terminal (information terminal), 11 is a microwave oven, 12 is a range body, 13 is a body box, 13a is an outer box, 14 is a door, 15 is an operation panel, 14a is a frame portion, 14b is a front plate portion, 14c Is punching metal (metal part for radio wave shield), 16 is a handle, 17 is a circuit board, 19 is a control circuit, 43 is a communication adapter (communication means), 49 is an antenna, 50 is a coaxial cable, 51 is a core wire, and 53 is a shield. Reference numerals 61, 64, and 65 denote antennas, 65a and 65b denote conductor patterns, 66 denotes a circuit board, 67 denotes an antenna, 68 denotes a circuit board, 72 denotes an antenna, 73 denotes an electrical insulator, and 74 denotes an antenna.

Claims (5)

A range body configured with a door on the front of the body box,
A communication means provided in the range body for communicating information including cooking information;
An antenna for performing this communication wirelessly,
Both the doors have a frame portion made of synthetic resin and a front plate portion attached thereto, and a metal portion for radio wave shielding provided on the back side of the front plate portion,
The antenna is provided in a frame portion of the door, and is connected to the communication means by a coaxial cable.
A microwave oven characterized in that a shield wire of the coaxial cable is conducted to a metal part for radio wave shielding . A synthetic resin handle is provided on the door frame,
The microwave oven according to claim 1, wherein the antenna is provided on the handle . The microwave oven according to claim 1, wherein the antenna is formed on a circuit board . The microwave oven according to claim 1, wherein the antenna is provided so that its orientation can be changed . 2. The microwave oven according to claim 1, wherein the antenna is configured on a circuit board on which electrical components are mounted .

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