Noise Canceller Device

Abstract

To provide a noise canceler device that effectively removes noise components of electromagnetic waves with a simple configuration.SOLUTION: A noise canceler device 1 includes an antenna 2 that receives electromagnetic waves, a semiconductor sheet 3 sandwiching the antenna 2, an electrode plate 4 provided on the outer surface of the semiconductor sheet 3, and a phase rotation circuit 51 connected between the electrode plate 4 and the antenna 2, which rotates the phase of the noise components of the electromagnetic waves transmitted from the semiconductor sheet 3 to the electrode plate 4 and returns it to the antenna 2, and the semiconductor sheet 3 is made of a material that converts electrical energy into thermal energy for consumption.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a noise canceller device that removes noise components of electromagnetic waves generated by audio equipment and electronic devices. [Background technology]

[0002] Conventionally, electromagnetic wave shielding boxes have been proposed that have sufficient strength and functionality to protect stored electronic devices from the effects of external electromagnetic waves and to prevent generated electromagnetic waves from leaking to the outside (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-134977 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when electronic equipment is housed in a box, the inside of the box becomes filled with electromagnetic waves, which may increase noise and errors in the electronic equipment.

[0005] The present invention has been made in view of the above circumstances, and provides a noise canceller device that can effectively remove noise components of electromagnetic waves with a simple configuration. [Means for solving the problem]

[0006] In order to solve these problems, the present invention provides a noise canceller device comprising: an antenna that receives electromagnetic waves, a semiconductor sheet that sandwiches the antenna, an electrode plate provided on the outer surface of the semiconductor sheet, and a phase rotation circuit that is connected between the electrode plate and the antenna and rotates the phase of noise components of the electromagnetic waves transmitted from the semiconductor sheet to the electrode plate and returns the phase to the antenna, wherein the semiconductor sheet is made of a material that converts electrical energy into thermal energy and consumes it.

[0007] The noise canceller device may be formed in a sheet-like shape by sandwiching the antenna, the semiconductor sheet, and the electrode plate between exterior substrates on both sides, and a circuit board of the phase rotation circuit may be inserted at any position within the noise canceller device formed in the sheet-like shape.

[0008] The present invention also provides a noise canceller device comprising: a first semiconductor sheet having an antenna for receiving electromagnetic waves attached to its outer surface and rolled up so as to be hollow; a second semiconductor sheet rolled up on the first semiconductor sheet and having the antenna attached to its outer surface; a third semiconductor sheet rolled up on the second semiconductor sheet; electrode plates provided on an inner surface of the first semiconductor sheet and an outer surface of the third semiconductor sheet; and a phase rotation circuit connected between the electrode plates and the antenna, rotating the phase of noise components of the electromagnetic waves transmitted from the first to third semiconductor sheets to the electrode plates and returning the noise components to the antenna, wherein the first to third semiconductor sheets are made of a material that converts electrical energy into thermal energy and consumes it. Effect of the Invention

[0009] According to the noise canceller device of the present invention, the electrical energy of the noise components of the electromagnetic waves received by the antenna is converted into thermal energy by the semiconductor sheet and consumed, and the phase of the noise components is rotated and returned to the antenna, so that the returned noise components and the noise components of the electromagnetic waves received by the antenna cancel each other out, thereby effectively removing noise. [Brief description of the drawings]

[0010] [Figure 1] 1 is a partial cross-sectional side view of a noise canceller device according to a preferred embodiment of the present invention. [Diagram 2] FIG. 2 is a partial cross-sectional side view showing another example of a noise canceller device according to a preferred embodiment of the present invention. [Diagram 3] 1 is a diagram showing a configuration including an electrical configuration of a noise canceller device according to a preferred embodiment of the present invention; [Figure 4] FIG. 11 is a partial cross-sectional side view of a noise canceller device according to another preferred embodiment of the present invention. [Diagram 5] FIG. 11 is a perspective view showing a first semiconductor sheet of a noise canceller device according to another preferred embodiment of the present invention. [Figure 6] FIG. 11 is a perspective view showing a second-layer semiconductor sheet of a noise canceller device according to another preferred embodiment of the present invention. [Figure 7] FIG. 11 is a perspective view showing a third-layer semiconductor sheet of a noise canceller device according to another preferred embodiment of the present invention. [Figure 8] FIG. 11 is a block diagram including an electrical configuration of a noise canceller device according to another preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a preferred embodiment of the noise canceller device of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following description, and various modifications and changes are possible for those skilled in the art based on the gist of the invention described in the claims or disclosed in the description for carrying out the invention. Such modifications and changes are also included in the scope of the present invention.

[0012] First Embodiment FIG. 1 shows an example of a partial cross-sectional side view of a noise canceller device 1 of this embodiment. First, the noise canceller device 1 includes an antenna 2 that receives electromagnetic waves generated by an audio device or an electronic device. The antenna 2 is sandwiched between semiconductor sheets 3, which will be described later. A metal electrode plate 4 is provided on the outer surface of the semiconductor sheet 3. A circuit board 5 of a phase rotation circuit 51 is provided on the outer surface of one of the electrode plates 4. As the outermost exterior, it is sandwiched from both sides by exterior boards 6 made of a material that transmits electromagnetic waves, such as plastic. The circuit board 5 may be provided alongside the electrode plate 4 on the outer surface of the semiconductor sheet 3, as shown in FIG. 2.

[0013] The noise canceller device 1 of this embodiment can be formed in a sheet shape by stacking the antenna 2, the semiconductor sheet 3, the electrode plate 4, the circuit board 5 of the phase rotation circuit 51, and the exterior board 6 in this way. The position of the circuit board 5 is not limited to the position shown in Figs. 1 and 2, and can be provided at any position. That is, for example, the circuit board 5 can be inserted at any position in the noise canceller device 1 formed in a sheet shape. Also, the circuit board 5 can be housed in, for example, a circuit box (not shown) or the like, and the circuit box can be inserted at any position in the noise canceller device 1 formed in a sheet shape, or the circuit box can be fixed to the outer surface of the exterior board 6.

[0014] <Antenna> 3 is a configuration diagram including an electrical configuration of the noise canceller device 1. The antenna 2 can be, for example, a sheet-like spiral antenna in which a conductor 22 is formed in a spiral shape on an insulator 21. For example, the antenna 2 can be a printed circuit board in which copper foil, which is the conductor 22, is printed in a spiral shape on an insulating substrate, which is the insulator 21.

[0015] In order to ensure the length of the antenna 2, it is preferable to form a first conductor 24 and a second conductor 24' on both the front surface 23 and the back surface 23' of the insulator 21. In Fig. 3, the first conductor 24 on the front surface 23 and the second conductor 24' on the back surface 23' are connected via through-hole pins A, A'.

[0016] By connecting a variable capacitor Cv between the through-hole pins B and B', it becomes possible to receive electromagnetic waves of any desired frequency band. In addition, the larger the area of ​​the antenna 2 in a plan view, the lower the frequency band of electromagnetic waves it can receive.

[0017] <Semiconductor sheet> The semiconductor sheet 3 is provided in contact with the antenna 2, and converts the electric energy of the electromagnetic waves received by the antenna 2 into heat energy for consumption. The material of the semiconductor sheet 3 is an organic hybrid vibration-damping material in which a functional material with electrical conductivity, piezoelectricity, and dielectric properties is dispersed in a polymer, and is already commercialized under the name "PIEZON Sheet" manufactured by Kiso Kogyo Co., Ltd. (for details, see, for example, JP 2013-228097 A). The material selected for use in this embodiment is sound quality adjustment material fo.Q manufactured by Kiso Kogyo Co., Ltd., with the product name "SH-21K."

[0018] <Phase rotation circuit> In Fig. 3, 51 is a phase rotation circuit. The electromagnetic waves received by the antenna 2 are transmitted to the electrode plate 4 via the semiconductor sheet 3. Here, the noise components of the electromagnetic waves are separated as noise currents through the electrode plate 4. The phase rotation circuit 51 is connected between the electrode plate 4 and the antenna 2, rotates the phase of the noise components of the electromagnetic waves transmitted from the semiconductor sheet 3 to the electrode plate 4, and returns the noise components to the antenna 2.

[0019] The phase rotation circuit 51 is composed of a first circuit 52 having resistors R1 and R2 in addition to one capacitor C1, a second circuit 53 having resistors R3 and R4 in addition to two capacitors C2 and C3, and a third circuit 54 having resistors R5 and R6 in addition to three capacitors C4, C5, and C6.

[0020] The first circuit 52 is configured by connecting a lead wire 55 drawn from a first electrode plate 41 provided on one of the semiconductor sheets 3 to one end of a parallel circuit made up of a capacitor C1 and a resistor R1, and connecting a resistor R2 between the other end of the parallel circuit and the lead wire 58.

[0021] The second circuit 53 is configured by connecting a lead wire 56 drawn from a second electrode plate 42 provided on one semiconductor sheet 3 and a third electrode plate 43 provided on the other semiconductor sheet 3 to one end of a parallel circuit made up of capacitors C2, C3 and resistor R3, and connecting a resistor R4 between the other end of the parallel circuit and lead wire 58.

[0022] The third circuit 54 is configured by connecting a lead wire 57 drawn from a fourth electrode plate 44 provided on the other semiconductor sheet 3 to one end of a parallel circuit made up of capacitors C4, C5, C6 and a resistor R5, and connecting a resistor R6 between the other end of the parallel circuit and the lead wire 58.

[0023] In the first circuit 52, the phase of the noise component (noise current) flowing from the first electrode plate 41 through the lead wire 55 is rotated by 90 degrees by one capacitor C1 and returned to the antenna 2 via the lead wire 58 from the resistor R2.

[0024] In the second circuit 53, the phase of the noise components (noise current) flowing in from the second electrode plate 42 and the third electrode plate 43 through the lead wire 56 is rotated (inverted) by 180 degrees by the two capacitors C2 and C3, and is returned to the antenna 2 via the resistor R4 and the lead wire 58.

[0025] In the third circuit 54, the phase of the noise component (noise current) flowing in from the fourth electrode plate 41 through the lead wire 57 is rotated by 270 degrees by the three capacitors C4, C5, and C6, and is returned to the antenna 2 via the resistor R6 and the lead wire 58.

[0026] In this way, the phase of the noise component is rotated and returned to the antenna 2, so that the returned noise component and the noise component of the electromagnetic wave received by the antenna 2 cancel each other out.

[0027] The configuration of the phase rotation circuit 51 is not limited to that shown in Fig. 3. In this embodiment, the phase rotation circuit 51 is configured by combining three circuits, the first circuit 52 to the third circuit 54, but the phase inversion circuit may be configured only with the second circuit 53, or may have a circuit configuration incorporating various active elements in addition to passive elements such as capacitors C1 to C6 and resistors R1 to R6. The circuit board 5 of the phase rotation circuit 51 is configured by mounting these passive elements and active elements on an insulating board and wiring them.

[0028] 3, there are four electrode plates 4, but there are no particular limitations on the number of electrode plates 4 and the positions at which they are fixed to the semiconductor sheet 3. It is preferable that the electrode plates 4 are provided on both of the two semiconductor sheets 3, but they may be provided on only one of the semiconductor sheets 3.

[0029] As described above, the noise canceller device 1 in this embodiment comprises the antenna 2 that receives electromagnetic waves, the semiconductor sheet 3 that sandwiches the antenna 2, the electrode plate 4 provided on the outer surface of the semiconductor sheet 3, and the phase rotation circuit 51 that is connected between the electrode plate 4 and the antenna 2 and rotates the phase of the noise components of the electromagnetic waves transmitted from the semiconductor sheet 3 to the electrode plate 4 and returns them to the antenna 2, and the semiconductor sheet 3 is made of a material that converts electrical energy into thermal energy and consumes it.

[0030] In this case, the electrical energy of the noise components of the electromagnetic waves received by the antenna 2 can be converted into thermal energy by the semiconductor sheet 3 and consumed. Furthermore, the electrode plate 4 separates the noise components of the electromagnetic waves transmitted from the semiconductor sheet 3 as a noise current, and the phase of the separated noise components, the noise current, is rotated and returned to the antenna 2, so that the returned noise components and the noise components of the electromagnetic waves received by the antenna 2 can cancel each other out. These two actions make it possible to effectively remove noise. For example, by installing the noise canceller device 1 of this embodiment in an audio device, the sound of the audio device becomes clearer.

[0031] Moreover, the noise canceller device 1 in this embodiment is a noise canceller device 1 formed in a sheet shape by sandwiching the antenna 2, the semiconductor sheet 3, and the electrode plate 4 between exterior substrates 6 on both sides, and the circuit board 5 of the phase rotation circuit 51 can be inserted at any position within the noise canceller device 1 formed in a sheet shape.

[0032] In this case, since the noise canceller device 1 is in a sheet shape, the versatility of the installation location is improved. For example, by sandwiching the noise canceller device 1 of this embodiment between the circuit boards of a computer, it is possible to reduce the occurrence of errors and improve the processing speed. In addition, if the noise canceller device 1 of this embodiment is applied to an MRI or the like, it becomes possible to obtain clearer images.

[0033] <Second embodiment> As shown in Figs. 4 to 7, the noise canceller device 1 of this embodiment differs from the first embodiment only in that the semiconductor sheet 3 (31, 32, 33) is rolled up to have a hollow configuration. Other points are the same as in the first embodiment, so a description will be omitted. An article that generates electromagnetic waves, such as a cable 7, can be inserted into the hollow portion. Although the noise canceller device 1 in the figures is cylindrical, the cross-sectional shape may be an ellipse or a polygon such as a triangle or a rectangle. Also, it may be symmetrical or asymmetrical.

[0034] 4 and 5, first semiconductor sheet 31 has antenna 2 for receiving electromagnetic waves attached to its outer surface, and is rolled up to be hollow. Electrode plates 4 (first electrode plate 41, second electrode plate 42) are provided on the inner surface of first semiconductor sheet 31.

[0035] As shown in Figures 4 and 6, the second semiconductor sheet 32 ​​is wound on the first semiconductor sheet 31, and the antenna 2 is attached to the outer surface. The antenna 2 passes through the second semiconductor sheet 32 ​​from the first semiconductor sheet 31 at point P and is attached to the outer surface of the second semiconductor sheet 32. In Figures 5 and 6, the antenna 2 is in the form of a coil.

[0036] 4 and 7, the third semiconductor sheet 32 ​​is rolled up on the second semiconductor sheet 32. The third semiconductor sheet 33 has an outer surface provided with an electrode plate 4 (third electrode plate 43, fourth electrode plate 44).

[0037] The circuit board 5 can be housed in, for example, a circuit box (not shown) or the like, and fixed, for example, to the outer surface of the third semiconductor sheet 33 (for example, the portion in FIG. 7 where the letters are written).

[0038] 8, the electrical configuration differs from that of the first embodiment only in the configuration of the antenna 2. Although the electrode plate 4 is not attached to the second semiconductor sheet 32, the second semiconductor sheet 32 ​​is in physical contact with the first semiconductor sheet 31 and the third semiconductor sheet 33. Therefore, the noise components of the electromagnetic waves are transmitted from the second semiconductor sheet 32 ​​to the electrode plate 4, the phase of which is rotated by the phase rotation circuit 51, and the noise components are returned to the antenna 2.

[0039] As described above, the noise canceller device 1 in this embodiment comprises the first semiconductor sheet 31 which is rolled up so as to be hollow, and has the antenna 2 which receives electromagnetic waves attached to its outer surface, the second semiconductor sheet 32 ​​which is rolled up over the first semiconductor sheet 31 and has the antenna 2 attached to its outer surface, the third semiconductor sheet 33 which is rolled up over the second semiconductor sheet 32, the electrode plate 4 which is provided on the inner surface of the first semiconductor sheet 31 and on the outer surface of the third semiconductor sheet 33, and the phase rotation circuit 51 which is connected between the electrode plate 4 and the antenna 2 and which rotates the phase of the noise components of the electromagnetic waves transmitted from the first to third semiconductor sheets 31, 32, 33 to the electrode plate 4 and returns the phase to the antenna 2, and the first to third semiconductor sheets 31, 32, 33 are made of a material which converts electrical energy into thermal energy and consumes it.

[0040] In this case, for example, by inserting the cable 7 of the audio device into the hollow portion, noise is effectively eliminated and the sound of the audio device becomes clear.

[0041] Although the present invention has been described above based on the embodiment, the present invention can be embodied in various modifications. For example, an aluminum plate (not shown) to which electrode plate 4 connected to phase rotation circuit 51 is attached may be provided to reflect high frequency waves, and the phase of the noise components of the electromagnetic waves transmitted from the aluminum plate to electrode plate 4 may be rotated by phase rotation circuit 51 and returned to antenna 2. [Explanation of symbols]

[0042] 1. Noise canceller device 2 Antennas 3,31,32,33 Semiconductor sheet 4 Electrode plate 5 Circuit Board 51 Phase Rotation Circuit 6 Exterior board

Claims

1. An antenna for receiving electromagnetic waves; A semiconductor sheet sandwiching the antenna; an electrode plate provided on an outer surface of the semiconductor sheet; a phase rotation circuit connected between the electrode plate and the antenna, which rotates the phase of the noise component of the electromagnetic wave transmitted from the semiconductor sheet to the electrode plate and returns the phase of the noise component to the antenna; The noise canceller device is characterized in that the semiconductor sheet is made of a material that converts electrical energy into thermal energy and consumes it.

2. 2. The noise canceller device according to claim 1, wherein the antenna, the semiconductor sheet, and the electrode plate are sandwiched between exterior substrates on both sides to form a sheet-like noise canceller device, and a circuit board of the phase rotation circuit is inserted at an arbitrary position within the sheet-like noise canceller device.

3. a first semiconductor sheet having an antenna for receiving electromagnetic waves attached to an outer surface thereof and rolled up so as to be hollow; a second semiconductor sheet wrapped over the first semiconductor sheet and having the antenna attached to an outer surface thereof; a third semiconductor sheet wrapped around the second semiconductor sheet; an electrode plate provided on an inner surface of the first semiconductor sheet and an outer surface of the third semiconductor sheet; a phase rotation circuit connected between the electrode plate and the antenna, which rotates the phase of noise components of the electromagnetic waves transmitted from the first to third semiconductor sheets to the electrode plate, and returns the noise components to the antenna; The noise canceller device is characterized in that the first to third semiconductor sheets are made of a material that converts electrical energy into thermal energy and consumes it.

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