JP2002257966A - Sensor signal transmission device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Because the metal braid of the shielded wire and the thickness of the ferrite rubber make it impossible to realize the right-angled bending of the small radius of the signal transmission line, the routing radius of the shielded wire becomes unnecessarily large, and the length of the shielded wire becomes longer. In addition, there has been a problem that the length becomes excessively long and the material to be used increases more than necessary. SOLUTION: An electromagnetic wave shielding means of a ferrite rubber 7 and a shield body 6, a signal transmission path 8, and a sensor signal transmission means having a discontinuous portion 10 of the electromagnetic wave shielding means are provided. The wire 8 can be bent at a right angle with a small radius in the path 8, so that the length of the wire as the sensor signal transmission means can be realized with a minimum length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to superposition of high-frequency electromagnetic wave noise on a sensor signal transmission circuit and a control circuit for device operation in order to stably control a device that generates high-frequency electromagnetic waves as device operation. The present invention relates to a sensor signal transmission device having a prevented configuration.

[0002]

2. Description of the Related Art Conventionally, as this type of sensor signal transmission device, there has been a device described in Japanese Utility Model Laid-Open No. 4-46615, for example. FIG. 13 shows a conventional sensor signal transmission device described in the above publication.

In FIG. 13, a shield body as an electromagnetic wave shielding means is removed at one side connected to a control circuit side by a shield wire 1, and a metal cover A2 as an electromagnetic wave shielding means is removed.
And a metal cover B3 as an electromagnetic wave shielding means, and wrapping a sensor signal conversion circuit board including an infrared sensor element 4 as a sensor means as a metal shielding box 5, the metal cover A2 of the electromagnetic wave shielding means and the metal cover This is a sensor signal transmission device having a configuration in which electromagnetic wave shielding means is continuous from a metal shielding box 5 made of B3 to a part where a shield body of a shield line 1 is connected to a control circuit side and a removed portion is connected.

FIG. 10 is a perspective view of FIG. 13, which shows that the shield body of the shield wire 1 is formed as a dense braid of metal fibers, so that it is impossible to route a wire with a small radius of a right angle. . Further, FIG. 11 shows a configuration diagram in which the shield wire 1 is in a straight line state, FIG. 12 shows a state in which the shield wire 1 is bent at a right angle, and shows that a wire with a small radius of the right angle cannot be routed. I have.

[0005]

However, in the above-mentioned conventional configuration, in the range from the metal shielding box 5 of the electromagnetic wave shielding means to the portion where the shield body of the shield wire 1 ends, the shield wire 1 is used as the wiring. Since the shield is made of a metal braid, it is in a state where it is not possible to wire and bend a wire having a small radius of a right angle. For this reason, there has been a problem that the routing radius of the shield wire 1 becomes unnecessarily large, the length of the shield wire 1 becomes unnecessarily long, and the material used becomes unnecessarily large.

The present invention solves the above-mentioned conventional problems. An electromagnetic wave shielding means is provided in a sensor signal transmission device from a sensor signal conversion circuit board 5 including an infrared sensor element 4 as a sensor means to a control circuit side. A sensor that constitutes a discontinuous portion, realizes a small-radius routing bending of a right-angle routing of a wiring routing, and realizes an optimal quantity of a material used for an electromagnetic wave shielding means and an effective use of resources by a shortest routing of the shield wire 1. It is an object to provide a signal transmission device.

[0007]

In order to solve the above-mentioned conventional problems, a sensor signal transmitting device according to the present invention has a discontinuous portion of the electromagnetic wave shielding means as a signal transmission line not surrounded by the electromagnetic wave shielding means. It is a configuration.

Accordingly, the signal transmission path not surrounded by the electromagnetic wave shielding means is released from the metal braided shield body that is not easily bent and deformed from the ferrite rubber that increases the diameter of the entire shielded wire. The right-angled wiring and small-diameter wiring routing and bending are facilitated. As described above, the right-angle routing and the small-diameter wiring routing and bending in the signal transmission path not surrounded by the electromagnetic wave shielding means are facilitated, so that the shortest routing of the shield wire can be realized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 comprises a sensor means for detecting a state change caused by the operation of a device, and a sensor signal transmitting means for transmitting a sensor signal from the sensor means to a control means. , An electromagnetic wave generating means for emitting high-frequency electromagnetic waves as part of the operation of the device, an electromagnetic wave shielding means for preventing high-frequency electromagnetic waves from entering a signal transmission path inside the sensor signal transmitting means, and a sensor signal surrounded by the electromagnetic wave shielding means. A signal transmission path to be transmitted and a range of the signal transmission path not surrounded by the electromagnetic wave shielding means are provided as discontinuous portions of the electromagnetic wave shielding means. Since it is easy to route wires at right angles and to route wires with a small radius on the road, the shortest route of the shield wire can be realized. It is possible to provide a sensor signal transmitting apparatus which realizes effective utilization of the optimum quantity of the resources of the material.

[0010] The invention described in claim 2 is particularly advantageous in claim 1.
The electromagnetic wave generating means described in the above is a magnetron for a microwave oven, the fundamental frequency of the high-frequency electromagnetic wave diffused inside the device is 2450MHz, such a metal outer box that emitted the microwave band electromagnetic waves Inside the microwave, there is a standing wave of microwaves, and the arrangement of the strong electric field part and the weak electric field part is alternately repeated in this standing wave. By arranging the presence or absence of the place where the shielding means is installed, it is possible to prevent the entry of high-frequency electromagnetic waves into the signal transmission path. This allows
By configuring the discontinuous part in the electromagnetic wave shielding means according to the arrangement of the strong and weak electric field part of the microwave standing wave, and realizing the small radius drawing bending of the right angle drawing by the wiring drawing, by the shortest drawing of the shield wire In addition, it is possible to provide a sensor signal transmission device that realizes an optimal quantity of a material used for the electromagnetic wave shielding means and an effective use of resources.

[0011] The invention described in claim 3 is particularly advantageous in claim 1.
The electromagnetic wave shielding means described in (1) is a shield wire made of ferrite rubber and metal braid and a metal shielding box 5, so that the sensor element and the sensor signal conversion circuit are housed in the metal shielding box 5, and the sensor element and the sensor signal conversion are performed. The electromagnetic wave does not directly reach the circuit, and a discontinuous portion of the electromagnetic wave shielding means is provided at a place where the shield wire is pulled out from the metal shielding box 5, and the wire is bent at a right angle in the signal transmission path and the wiring is bent with a small radius. This makes it possible to realize the shortest routing of the shielded wire. It is possible to provide a sensor signal transmission device that realizes the optimal quantity of the material used for the electromagnetic wave shielding means and the effective use of resources by the shortest route of the shield wire.

[0012] The invention described in claim 4 is particularly advantageous in claim 1.
The electromagnetic wave shielding means described in the above is a shield wire made of a ferrite rubber and a metal braid, and a shielding box 5 of a ferrite core and a metal, so that the ferrite core is arranged at a discontinuous portion of the electromagnetic wave shielding means, and Since the discontinuous portion of the electromagnetic wave shielding means can be set wider than the combination of the electromagnetic wave shielding means with the metal shielded wire and the metal shielding box 5, the wiring can be routed at a right angle and a small radius in the signal transmission path in a wide range. Since the bending is facilitated, the shortest routing of the shield wire can be realized. It is possible to provide a sensor signal transmission device that realizes the optimal quantity of the material used for the electromagnetic wave shielding means and the effective use of resources by the shortest route of the shield wire.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a diagram showing a sensor signal transmission device according to a first embodiment of the present invention.

In FIG. 1, a sensor signal conversion circuit board including an infrared sensor element 4 as a sensor means is wrapped in a metal shielding box 5 so that a metal cover A2 and a metal cover B3 of an electromagnetic wave shielding means are formed. Shielding box 5
The surface of the shield wire 1 drawn out is surrounded by a metal braided shield body 6 as an electromagnetic wave shielding means. Further, a ferrite rubber 7 as an electromagnetic wave shielding means is disposed between the signal transmission path 8 and the inside of the metal braided shield 6. A ferrite rubber 7 as an electromagnetic wave shielding means and a metal braided shield body as an electromagnetic wave shielding means are provided between the shield wire 1 and the connector 9 for connection to the control means.
6 constitutes a discontinuous portion 10.

The operation and operation of the sensor signal transmission device configured as described above will be described below.

FIG. 7 is a perspective view showing the appearance of a microwave oven as a high-frequency heating device. Opening / closing door 11 for storing food as an object to be heated in a heating chamber of a microwave oven
And an input operation unit 12 for inputting an operation procedure for controlling the operation of the microwave oven, and a body 13 for concealing a charging unit inside the device as a metal shell of the microwave oven and protecting the inside of the device. I can see.

FIG. 8 is a block diagram of a microwave oven as a high-frequency heating device. The heating chamber 15 stores a food 14 as an object to be heated, a magnetron 16 as heating means of the high-frequency heating device, and a food 14. And a control means 19 for controlling the operation of a rotating mounting table 17 for rotating the mounting table 17, a magnet 18 and a motor 18 for rotating the rotating mounting table 17, and a sensor for detecting the temperature condition of the food 14 in the heating chamber 15. It comprises a sensor signal transmitting means 20 for transmitting a sensor signal from the infrared sensor element 4 as means to the control means 19.

Further, FIG. 9 is a view showing a state in which a body 13 as a metal shell of a microwave oven as a high-frequency heating device is removed, and an opening / closing door 11, an input operation unit 12, a magnetron 16, a control means 19, and the inside of the equipment are cooled. Means for supplying high voltage to the blower blade motor 21 and the magnetron 16 to be driven, the metal cover A2, the shield wire 1, and the connector
The configuration in which 9 is located is shown.

The operation of the apparatus is as follows. The food 14 is placed on the rotating table 17 of the heating chamber 15 and the input operation unit 12 is operated.
When the instruction to start heating is given by the operation of, the rotating table 17 in the heating chamber 15 rotates and the magnetron 16 starts operating by the high voltage generated by the step-up means 22 to emit high-frequency electromagnetic waves from the antenna. High-frequency power is supplied into the heating chamber 15. And food 1 for a while
When 4 is heated, the temperature of food 14 rises. The temperature rise of the food 14 is detected by the infrared sensor element 4 as the sensor means for monitoring the inside of the heating chamber 15 and the control means 1 detects that the temperature reached the temperature set at the start of heating.
After the confirmation in step 9, the heating is terminated, and a notification sound is generated to inform the user that the operation of the device has been terminated.

In the heating operation for heating the food 14, the high-frequency electromagnetic wave is applied to the heating chamber 1 while detecting the temperature rise of the food 14 and transmitting the sensor signal to the control means 19.
5 and magnetron 16 outside heating chamber 15
Control means 19 and blower blade motor 2 for cooling the inside of equipment
Boosting means 22 for supplying a high voltage to the magnetron 1 and the magnetron 16
A high-frequency electromagnetic wave is also present in the space surrounded by the body 13 as a metal outer shell of the machine room where the metal cover A2, the shield wire 1 and the connector 9 are arranged. Since the high-frequency electromagnetic wave existing in the machine room is surrounded by the metal wall, a standing wave of the high-frequency electromagnetic wave easily exists.

When the shield wire 1 from the infrared sensor element 4 as the sensor means to the control means 19 is arranged in the standing wave, the electromagnetic wave shielding means may be an electric field within the standing wave of the high-frequency electromagnetic wave. The metal braided shield 6 or the ferrite rubber 7 as the electromagnetic wave shielding means is arranged in the strong electric field portion by being arranged at the position corresponding to the strength, and the discontinuous portion 10 of the electromagnetic wave shielding means is arranged in the weak electric field portion. Even if the metal braided shield 6 or the ferrite rubber 7 does not exist, the sensor signal is stably transmitted from the infrared sensor element 4 as the sensor means to the control means 19. Then, the shield wire 1 drawn out of the metal shielding box 5 composed of the metal cover A2 and the metal cover B3 of the electromagnetic wave shielding means is provided between the shield body 6 as the electromagnetic wave shielding means and the connector 9 to the control means 19. 2 and 4 in the signal transmission line not surrounded by the ferrite rubber 7.
And the discontinuous portion 10 of the electromagnetic wave shielding means as shown in FIG.
Achieving the optimum amount of material used for electromagnetic wave shielding means and effective use of resources by implementing the shortest bending of the shielded wire 1 by realizing multiple small radius bending in accordance with the number of locations where 0 exists Thus, it is possible to provide a sensor signal transmission device that has been described.

Further, the shielded wire 1 drawn from the metal shielding box 5 composed of the metal cover A2 and the metal cover B3 of the electromagnetic wave shielding means to the connector 9 to the control means 19 serves as electromagnetic wave shielding means. The ferrite core 23 as the electromagnetic wave shielding means surrounding a part of the discontinuous portion 10 of the electromagnetic wave shielding means of the signal transmission path not surrounded by the shield body 6 and the ferrite rubber 7 is shown in FIGS. When the shield wire 1 is realized, the discontinuous portion 10 of the electromagnetic wave shielding means
The range of the signal transmission path not surrounded by the shield body 6 and the ferrite rubber 7 can be widened, so that the right angle routing and the small radius wiring routing in the signal transmission path can be easily performed over a wide range, and the Can be realized. It is possible to provide a sensor signal transmission device that realizes the optimal quantity of the material used for the electromagnetic wave shielding means and the effective use of resources by the shortest route of the shield wire.

As described above, in the present embodiment, in the signal transmission path 8 which is not surrounded by the shield body 6 as the electromagnetic wave shielding means of the shield wire 1 and the ferrite rubber 7, the discontinuous portion 10 of the electromagnetic wave shielding means is not provided. With this configuration, the right angle routing and the small radius routing and bending in the signal transmission path 8 are facilitated, so that the shortest routing of the shield wire 1 can be realized, and the optimum amount of material used for the electromagnetic wave shielding means can be realized. A sensor signal transmission device that realizes quantification and effective use of resources can be provided.

In this embodiment, in addition to the magnetron 16 as the electromagnetic wave generating means, the contact of a relay included in the control means 19 and the blower blade motor 2 for cooling the inside of the equipment are provided.
The influence of the noise of the weak high-frequency electromagnetic wave from the inverter power supply or the like as the switching power supply as the boosting means 22 for supplying the high voltage to the magnetron 16 is controlled by the sensor element and the sensor signal conversion circuit. Can also be maintained as an electromagnetic wave shielding means that can also suppress reaching.

Further, even if the shield wire portion, the metal shielding box 5 and the ferrite core as the electromagnetic wave shielding means of the present embodiment are replaced with a metal pipe, an electromagnetic wave absorber, or another material having a function of suppressing electromagnetic wave transmission, By providing the discontinuous portion 10 of the shielding means, it is easy to route the wire at right angles and to wire and bend with a small radius in the signal transmission path, so that the shortest routing of the sensor signal transmission means 20 can be realized. By the shortest route of the sensor signal transmitting means 20, it is possible to provide a sensor signal transmitting apparatus which realizes the optimal quantity of the material used for the electromagnetic wave shielding means and the effective use of resources.

[0027]

As described above, according to the present invention, it is possible to realize the shortest bending of the shielded wire, and to realize the optimum quantity of the material used for the electromagnetic wave shielding means and the effective use of resources. Can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a discontinuous part and a main part of an electromagnetic wave shielding unit according to a first embodiment of the present invention.

FIG. 2 is a right-angle bending diagram of a shielded wire according to the first embodiment of the present invention.

FIG. 3 is a right-angle bending diagram of a shielded wire with a ferrite core according to the first embodiment of the present invention.

FIG. 4 is a right-angle bending diagram of a shield wire having a widened discontinuous portion of the electromagnetic wave shielding means according to the first embodiment of the present invention.

FIG. 5 is a right-angle bending diagram of a shield wire in which a discontinuous portion is widened by a plurality of divisions of the electromagnetic wave shielding means according to the first embodiment of the present invention.

FIG. 6 is a right-angle bending diagram of a shield wire in which a ferrite core is arranged at a discontinuous portion of the electromagnetic wave shielding means according to the first embodiment of the present invention.

FIG. 7 is an external perspective view of a microwave oven according to the first embodiment of the present invention.

FIG. 8 is a block diagram of a microwave oven according to the first embodiment of the present invention.

FIG. 9 is a configuration perspective view of the microwave oven according to the first embodiment of the present invention in a state where a body as a metal outer shell is removed.

FIG. 10 is a perspective view showing a shield wire and a metal shield box as a conventional sensor signal transmission device.

FIG. 11 is a front view in which a shield wire as a conventional sensor signal transmission device is straightened.

FIG. 12 is a front view in which a shield wire as a conventional sensor signal transmission device is bent at a right angle.

FIG. 13 is a front view showing a cross section of a shield line and a metal shield box as a conventional sensor signal transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield wire 2 Metal cover A (electromagnetic wave shielding means) 3 Metal cover B (electromagnetic wave shielding means) 4 Infrared sensor element (sensor means) 5 Metal shielding box (electromagnetic wave shielding means) 6 Shield body (electromagnetic wave shielding means) 7 Ferrite rubber (Electromagnetic wave shielding means) 8 Signal transmission line 10 Discontinuous part 16 Magnetron (electromagnetic wave generation means) 19 Control means 20 Sensor signal transmission means 23 Ferrite core

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) H05K 9/00 H05K 9/00 C (72) Inventor Takahito Okutsu 1006 Odakadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F term (reference) 2F078 HA14 3K086 AA04 AA05 AA10 BA08 EA06 3K090 AA09 AA15 AB02 BA01 BB01 EB10 EC10 5E321 AA01 BB33 BB44 BB51 GG05 GG09

Claims (4)

[The claims] 1. Sensor means for detecting a state change caused by the operation of a device, control means for controlling the entire operation of the device, and sensor signal transmitting means for transmitting a sensor signal from the sensor means to the control means. , An electromagnetic wave generating means for emitting high-frequency electromagnetic waves as part of the operation of the device, an electromagnetic wave shielding means for preventing high-frequency electromagnetic waves from entering a signal transmission path inside the sensor signal transmitting means, and a sensor signal surrounded by the electromagnetic wave shielding means. A sensor signal transmission device comprising: a signal transmission path for transmission; and a sensor signal transmission unit having a discontinuous portion of the electromagnetic wave shielding unit as a signal transmission line not surrounded by the electromagnetic wave shielding unit. 2. The sensor signal transmitting device according to claim 1, wherein the electromagnetic wave generating means is a magnetron for a microwave oven. 3. The electromagnetic wave shielding means includes a shield wire made of ferrite rubber and a metal braid, a metal cover A2, and a metal cover B.
The sensor signal transmission device according to claim 1, wherein the sensor signal transmission device is a metal shielding box comprising: 4. The sensor signal transmission device according to claim 1, wherein the electromagnetic wave shielding means is a shielded wire made of a ferrite rubber and a metal braid, and a metal shielding box including a ferrite core, a metal cover A2, and a metal cover B3.