Filter device

Abstract

To enable wireless power supply to be performed through a housing made of a ferromagnetic material.SOLUTION: The present invention includes: a filter element; a housing in which the filter element is provided; and a wireless power supply unit having an external member provided outside the housing, an internal member provided inside the housing, and a power supply unit that supplies electric power to an external coil included in the external member. The housing has a plate-like section formed of a ferromagnetic material, and the external member and the internal member are provided sandwiching the plate-like part. The external member has an external core in which the external coil is provided. The internal member has an internal coil and an internal core in which the internal coil is provided. The external core has a first end member and a first linking section in which the external coil is provided, and the internal core has a second end member and a second linking section in which the internal coil is provided. A first end, which is a tip end of the first end member, faces a second end, which is a tip end of the second end member, across the plate-like part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a filter device. [Background technology]

[0002] Patent Document 1 discloses a filter system for wireless power transmission. In this filter system, a wireless power receiver is associated with a filter body, and the wireless power receiver includes a feedback channel circuit. The feedback channel circuit includes a receiving antenna, a control circuit in electrical communication with the wireless power receiver, and a feedback channel circuit in communication with the control circuit, and is configured to transmit through a channel separated from the receiving antenna. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-512778 Summary of the Invention [Problem to be solved by the invention]

[0004] In the invention described in Patent Document 1, it is possible to place a wireless power transmitter and a wireless power receiver in separate locations. However, in the invention described in Patent Document 1, power cannot be transmitted if the housing is made of a ferromagnetic material such as iron.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a filter device that can perform wireless power supply by sandwiching a housing made of a ferromagnetic material therebetween. [Means for solving the problem]

[0006] In order to solve the above problem, a filter device according to the present invention includes, for example, a filter element, a housing in which the filter element is provided, an external member provided outside the housing, an internal member provided inside the housing, and a wireless power supply unit having a power supply unit that supplies power to an external coil of the external member, wherein the housing has a metal plate-shaped portion formed of a ferromagnetic material, the external member and the internal member are provided on either side of the plate-shaped portion, the external member has an external core on which the external coil is provided, the internal member has an internal coil and an internal core on which the internal coil is provided, the external core has a first end member and a first connecting portion on which the external coil is provided, the internal core has a second end member and a second connecting portion on which the external coil is provided, and a first end which is a tip of the first end member and a second end which is a tip of the second end member face each other at a plurality of separated positions across the plate-shaped portion.

[0007] According to the filter device of the present invention, the external core of the external member provided outside the housing and the internal core of the internal member provided inside the housing are disposed with a plate-shaped portion formed of a ferromagnetic material sandwiched therebetween, and the tip of the external core and the tip of the internal core face each other at multiple points with the plate-shaped portion in between, thereby enabling wireless power supply to be performed with the housing formed of a ferromagnetic material sandwiched between them.

[0008] The outer core and the inner core may be formed of rod-shaped or band-shaped members, the first end member has a third end member and a fourth end member arranged at a distance from each other, the first connecting portion connects the third end member and the fourth end member, the second end member has a fifth end member and a sixth end member arranged at a distance from each other, the second connecting portion connects the fourth end member and the fifth end member, a third end which is a tip of the third end member faces a fifth end which is a tip of the fifth end member across the plate-shaped portion, and a fourth end which is a tip of the fourth end member faces a sixth end which is a tip of the sixth end member across the plate-shaped portion. This generates a pair of strong magnetic fields, making it possible to supply power with a magnetic body sandwiched between them.

[0009] The first end member and the second end member may be formed into a cylindrical shape by bending a strip-shaped member, the first connecting portion may be provided in a hollow portion of the cylindrical first end member, and the second connecting portion may be provided in a hollow portion of the cylindrical second end member. This generates a pair of strong magnetic fields, making it possible to supply power with a magnetic body sandwiched between them.

[0010] The power supply unit may modulate a current flowing through the external coil, thereby enabling wireless communication from the outside to the inside of the housing.

[0011] The present invention may further include an adjustment unit that changes the impedance of a circuit including the internal coil, and an acquisition unit that acquires information indicating that the impedance of the circuit has been changed by the adjustment unit by measuring a current flowing through the external coil. This enables wireless communication from inside the housing to the outside.

[0012] The housing may further include a sensor disposed adjacent to the internal member, and the adjustment unit may change impedance based on a measurement result of the sensor. This makes it possible to wirelessly transmit the measurement result of the sensor. Effect of the Invention

[0013] According to the present invention, wireless power supply can be performed by sandwiching a housing made of a ferromagnetic material. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing an outline of a filter device 1 according to a first embodiment of the present invention. [Diagram 2] 1A and 1B are diagrams showing the main part of a filter device, in which (A) is a cross-sectional view and (B) is a bottom view. [Diagram 3] 1 is a block diagram showing an outline of the electrical configuration of a filter device 1. FIG. [Figure 4] 1A and 1B are diagrams showing the main part of a filter device 2, in which (A) is a cross-sectional view and (B) is a bottom view. [Diagram 5] 1A and 1B are diagrams showing the main part of a filter device 3, in which (A) is a plan view (viewed from above) and (B) is a cross-sectional view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The filter device according to the present invention removes dust and the like contained in liquids such as oil, fuel, and urea water. In this embodiment, a fuel filter that removes dust and the like contained in fuel will be described as an example of the filtering device, but the filtering device is not limited to a fuel filter and can be used, for example, as a return filter. In addition, in this embodiment, hydraulic oil will be described as an example of the liquid to be filtered, but the liquid to be filtered is not limited to hydraulic oil and can be various liquids containing additives, such as fuel (petroleum-based, ethanol-based).

[0016] <First embodiment> Fig. 1 is a diagram showing an outline of a filter device 1 according to a first embodiment of the present invention. Note that in Fig. 1, hatching showing a cross section is partially omitted.

[0017] The filter device 1 mainly includes a housing 10, a filter element 20, and a wireless power supply unit 50. The housing 10 mainly includes a case 11 and a head 15. The case 11 and the head 15 are formed of a ferromagnetic material. A ferromagnetic material is a material that has the property of being strongly magnetized by an externally applied magnetic field and retaining the magnetization even when the magnetic field is removed (ferromagnetic material). Examples of ferromagnetic materials include iron, nickel, cobalt, and alloys containing these materials (carbon steel, alloy steel, cast iron, etc.) or oxides (ferrite, etc.). In this embodiment, cast iron is used for the case 11 and the head 15.

[0018] Case 11 is a cylindrical member with one end substantially closed and the other end open. Side surface 13 of case 11 is cylindrical, and the lower end of side surface 13 is covered by bottom surface 12. The upper end of side surface 13 is open. Bottom surface 12 and side surface 13 (corresponding to the plate-like portion of the present invention) are formed using plate-like members.

[0019] The opening of the case 11 is attached to the head 15. The case 11 and the head 15 are fixed by a mounting member 17 provided along the outer periphery of the case 11 and the head 15. However, the mounting member 17 is not essential, and the method of fixing the case 11 and the head 15 is not limited to this. For example, the case 11 and the head 15 may be fixed by screwing male and female threads provided on the case 11 and the head 15, respectively.

[0020] When the case 11 is attached to the head 15, the filter element 20 is attached to a central cylinder 15b (described in detail later) of the head 15. In addition, an elastic member 41 such as a coil spring is provided between the filter element 20 and the bottom surface 12, and the elastic member 41 presses the filter element 20 toward the head 15. In this way, the filter element 20 is accommodated inside the case 11.

[0021] The filter element 20 mainly includes a filter medium 21, an inner cylinder 22, an outer cylinder 23, and plates 24 and 25. The inner cylinder 22 is a substantially hollow cylindrical member having openings at both ends, and is provided with a plurality of holes (not shown) over the entire surface through which liquid passes. The outer cylinder 23 is a band-shaped member that covers a portion of the filter medium 21. The inner cylinder 22 and the outer cylinder 23 are not essential.

[0022] The filter medium 21 has a generally hollow cylindrical shape having a thickness in the radial direction. The filter medium 21 is formed by pleating a sheet-like filter paper made of synthetic resin, paper, or the like, and then connecting and rolling both ends of the pleated filter paper. However, the shape of the filter medium 21 is not limited to this.

[0023] A plate 24 is provided at one end (the upper end in FIG. 1) of the filter medium 21, and a plate 25 is provided at the other end (the lower end in FIG. 1).

[0024] The plate 24 is provided on the upper ends of the filter medium 21 and the inner tube 22. The central tube 15b of the head 15 is inserted into the plate 24. A seal member 43 (e.g., an O-ring) is provided between the plate 24 and the central tube 15b. The seal member 43 provides a seal so that liquid does not leak out from between the plate 24 and the central tube 15b. In addition, since the inner tube 22 is provided on the plate 24, when the central tube 15b is inserted into the plate 24, the internal space of the inner tube 22 communicates with the internal space of the central tube 15b.

[0025] The head 15 has a tubular portion 15a and a central tube 15b. The tubular portion 15a and the central tube 15b have a cylindrical shape and protrude toward the case 11. The tubular portion 15a is inserted into the mounting member 17.

[0026] The head 15 has a hole 15c serving as an inflow path, and holes 15d and 15e serving as outflow paths. A bypass valve 42 is provided on a wall surface separating the holes 15c and 15e. The hole 15c communicates with the space S1 between the case 11 and the filter element 20, and the hole 15d and 15e communicate with the inside of the inner cylinder 22 (space S2).

[0027] Liquid L1 to be filtered is supplied to the filter device 1 through the hole 15c. The liquid L1 (see the solid arrow in FIG. 1) flows into the space S1, is then filtered by the filter medium 21, and flows out into the space S2. The filtered liquid L2 (see the two-dot chain arrow in FIG. 1) that flows into the inside of the inner cylinder 22 is discharged to the outside of the filter device 1 through the outflow path.

[0028] In the present embodiment, the inflow and outflow paths are provided in the head 15, but the inflow and outflow paths may be provided in the housing 10. For example, the inflow and outflow paths may be provided in the case 11.

[0029] A space exists between the bottom surface 12 and the filter element 20 (plate 25) because an elastic member 41 is provided between the bottom surface 12 and the filter element 20 (plate 25). A wireless power supply unit 50 and a sensor 60 (not shown in FIG. 2, see FIG. 3) are provided in this space. The wireless power supply unit 50 will be described in detail below.

[0030] 2 is a diagram showing a main part of the filter device, where (A) is a cross-sectional view and (B) is a bottom view. Wireless power supply unit 50 mainly has external member 51 and internal member 52. External member 51 is provided outside housing 10, and internal member 52 is provided inside housing 10. External member 51 and internal member 52 are provided on either side of case 11, here bottom surface 12.

[0031] The external member 51 mainly has a core 511 and a coil 512 provided in the core 511. The internal member 52 mainly has a core 521 and a coil 522 provided in the core 521. The cores 511 and 521 have approximately the same shape.

[0032] Core 511 has end members 511a and 511b (corresponding to a first end member of the present invention) that are spaced apart from each other, and a connecting portion 511c (corresponding to a first connecting portion of the present invention) that connects end member 511a and end member 511b. Coil 512 is provided on connecting portion 511c.

[0033] Similar to core 511, core 521 has end members 521a and 521b (corresponding to a second end member of the present invention) arranged at a distance from each other, and a connecting portion 521c (corresponding to a second connecting portion of the present invention) connecting end member 521a and end member 521b. Coil 522 is provided on connecting portion 521c.

[0034] In this embodiment, the cores 511 and 521 are formed of rod-shaped or strip-shaped members. In this embodiment, the cores 511 and 521 are U-shaped, but the cores 511 and 521 may be U-shaped or V-shaped. In the case of a U-shape or V-shape, the two rod-shaped parts on both sides are end members, and the length and shape of the connecting part connecting the two end members are arbitrary. For example, the connecting part may or may not have an arc shape. In the case of a V-shape, the connecting part is not essential. The end member 511a corresponds to the third end member of the present invention, and the end member 511b corresponds to the fourth end member of the present invention. In addition, the end member 521a corresponds to the fifth end member of the present invention, and the end member 521b corresponds to the sixth end member of the present invention.

[0035] A tip 511d (corresponding to the third end of the present invention) of the end member 511a faces a tip 521d (corresponding to the fifth end of the present invention) of the end member 521a across the bottom surface 12. A tip 511e (corresponding to the fourth end of the present invention) of the end member 511b faces a tip 521e (corresponding to the sixth end of the present invention) of the end member 521a across the bottom surface 12. Therefore, a magnetic field is generated between the tip 511d and the tip 521d, and a magnetic field is generated between the tip 511e and the tip 522e.

[0036] Further, the areas of the tips 511d and 521d are substantially the same, and the areas of the tips 511e and 522e are substantially the same.

[0037] The distance between tip 511d, tip 521d and bottom surface 12 is short, and the distance between tip 511e, tip 522e and bottom surface 12 is short (tips 511d, 511e, 521d, 522e are adjacent to bottom surface 12), so that a strong magnetic field is generated. In addition, tips 511d, 511e of core 511 and tips 521d, 522e of core 521 face each other at multiple separated positions across bottom surface 12, so that a pair of strong magnetic fields is generated, and power can be supplied with a magnetic body sandwiched between them.

[0038] 3 is a block diagram showing an outline of the electrical configuration of the filter device 1. The wireless power supply unit 50 mainly includes an external circuit 55 and an internal circuit 56. The external circuit 55 mainly includes a power supply unit 55a and an acquisition unit 55b. The internal circuit 56 mainly includes a receiving unit 56a and an adjustment unit 56b.

[0039] First, power supply by the wireless power supply unit 50 will be described. Power supply unit 55a supplies power to coil 512. When power supply unit 55a supplies power and a current flows through coil 512, a magnetic field is generated between core 511 and core 521, and a change in this magnetic field generates an induced current in coil 522. Receiving unit 56a supplies the power generated by the induced current flowing through coil 522 to a battery (not shown). This allows wireless power supply.

[0040] Next, a description will be given of wireless communication (data communication) by the wireless power supply unit 50. Wireless communication includes wireless communication from the external circuit 55 to the internal circuit 56 and wireless communication from the internal circuit 56 to the external circuit 55.

[0041] First, wireless communication from the external circuit 55 to the internal circuit 56 will be described. The power supply unit 55a modulates the current flowing through the coil 512 as necessary. For example, the power supply unit 55a can perform amplitude modulation, frequency modulation, and phase modulation of an AC current that is a sine wave. The power supply unit 55a can also rectify the sine wave and modulate it into a pulse wave. The modulation into a pulse wave can be OnOff modulation in which the voltage is 0 when Off, or OnOff modulation with offset in which the voltage is not 0 when Off, etc. For example, the power supply unit 55a can include a rectifier circuit, a modulation circuit, etc.

[0042] The receiving unit 56a detects the waveform of the signal that the power supplying unit 55a has sent to the coil 512 based on the induced current generated in the coil 522. The receiving unit 56a also holds the relationship between the waveform that the power supplying unit 55a has sent to the coil 512 and data, and acquires data transmitted from the external circuit 55 to the internal circuit 56 based on this relationship. For example, the receiving unit 56a may include a demodulation circuit.

[0043] Next, wireless communication from the internal circuit 56 to the external circuit 55 will be described. The sensor 60 provided in the filter device 1 is, for example, a temperature sensor or a viscosity sensor. The adjustment unit 56b changes the impedance of the circuit including the coil 522 based on the measurement result of the sensor 60. For example, the adjustment unit 56b increases the impedance of the coil 522 when the temperature of the fluid increases. This makes it possible to wirelessly transmit the measurement result of the sensor 60. The adjustment unit 56b may include an impedance converter.

[0044] Acquiring unit 55b measures the current flowing through coil 512. When adjusting unit 56b changes the impedance of coil 522, the current flowing through coil 512 changes. Acquiring unit 55b acquires the change in impedance of coil 522 by measuring the current flowing through coil 512. Acquiring unit 55b holds the relationship between the change in impedance of coil 522 and data, and acquires data transmitted from internal circuit 56 to external circuit 55 based on this relationship.

[0045] According to this embodiment, wireless power supplying section 50 can be used to sandwich housing 10 (here, bottom surface 12) made of a ferromagnetic material to supply power wirelessly.

[0046] Furthermore, according to this embodiment, the current that the power supply unit 55a applies to the coil 512 is modulated, whereby wireless communication can be performed from the external circuit 55 to the internal circuit 56.

[0047] Furthermore, according to the present embodiment, the adjustment unit 56b changes the impedance of the circuit including the coil 522, so that wireless communication can be performed from the internal circuit 56 to the external circuit 55.

[0048] In the present embodiment, the external member 51 and the internal member 52 are provided facing each other with the bottom surface 12 in between, but the position of the wireless power supply unit 50 is not limited to this. For example, the external member 51 and the internal member 52 may be provided facing each other with the head 15 (e.g., the cylindrical portion 15a) in between. For example, the side surface or the top surface of the head 15 may be a plate-like portion formed of a plate-like member, and the external member 51 and the internal member 52 may be provided via this plate-like portion.

[0049] In addition, in the present embodiment, core 511 and core 521 have substantially the same shape, but cores 511 and 521 may have different shapes. For example, core 511 may be taller than core 521. By increasing the height of core 511, the number of turns of coil 512 can be increased or the size can be increased.

[0050] <Second embodiment> The second embodiment of the present invention is an embodiment in which the shape of the core of the wireless power supply unit is different. The filter device 2 according to the second embodiment will be described below. Note that the same parts as those in the first embodiment are given the same reference numerals and the description will be omitted.

[0051] 4A and 4B are diagrams showing the main parts of the filter device 2, where (A) is a cross-sectional view and (B) is a bottom view. The filter device 2 mainly has a housing 10, a filter element 20, and a wireless power supply unit 50A.

[0052] The wireless power supply unit 50A mainly has an external member 51A and an internal member 52A. The external member 51A is provided outside the housing 10, and the internal member 52A is provided inside the housing 10. The external member 51A and the internal member 52A are provided on either side of the case 11, here the bottom surface 12.

[0053] The outer member 51A mainly includes a core 511A and a coil 512A provided on the core 511A. The inner member 52A mainly includes a core 521A and a coil 522A provided on the core 521A.

[0054] The core 511A has an end member 511f (corresponding to a first end member of the present invention) and a connecting portion 511h (corresponding to a first connecting portion of the present invention). The end member 511f is formed into a cylindrical shape by bending a strip-shaped member, and the connecting portion 511h is provided in a hollow portion of the cylindrical end member 511f. The connecting portion 511h has a protruding portion 511i, and the coil 512A is provided on the protruding portion 511i.

[0055] Like core 511A, core 521A has end member 521f (corresponding to the second end member of the present invention) and connecting portion 521h (corresponding to the second connecting portion of the present invention). End member 521f is formed into a cylindrical shape by bending a strip-shaped member, and connecting portion 521h is provided in the hollow portion of cylindrical end member 521f. Connecting portion 521h has protruding portion 521i, and coil 522A is provided on protruding portion 521i.

[0056] A tip 511g (corresponding to a first end of the present invention) of the end member 511f faces a tip 521g (corresponding to a second end of the present invention) of the end member 521f across the bottom surface 12. The areas of the tips 511g and 521g are approximately the same.

[0057] In the present embodiment, the end members 511f and 521f are cylindrical, but the shape of the end members 511f and 521f is not limited to this. The end members 511f and 521f may be cylindrical, for example, elliptical or rectangular. The end members 511f and 521f may also be cylindrical with an inner diameter that decreases or increases toward the bottom surface 12.

[0058] The distance between tip 511g, tip 521g and bottom surface 12 is short (tips 511g, 521g are adjacent to bottom surface 12), so the generated magnetic field is strong. Tip 511g of core 511A and tip 521g of core 521A face each other at a plurality of separated positions across bottom surface 12. For example, tips 511g, 521g face each other across bottom surface 12 at two positions across end members 511f, 521f. This generates a pair of strong magnetic fields, making it possible to supply power with the magnetic material sandwiched between them.

[0059] According to this embodiment, by placing the tip 511g and the tip 521g opposite each other across the bottom surface 12, a pair of strong magnetic fields are generated, and power can be supplied with the magnetic body sandwiched between them. In addition, data can be transmitted from the external member 51A to the internal member 52A. Furthermore, by measuring the impedance of the internal member 52A, the external member 51A can receive data from the internal member 52A.

[0060] <Third embodiment> The third embodiment of the present invention is an embodiment in which the position of the wireless power supply unit 50 is different from that of the filter device 1. The filter device 3 according to the third embodiment will be described below. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0061] 5 is a diagram showing a main part of the filter device 3, where (A) is a plan view (view from above) and (B) is a cross-sectional view. The filter device 3 mainly has a housing 10, a filter element 20, and a wireless power supply unit 50.

[0062] In the filter device 3, an external member 51 and an internal member 52 of a wireless power supply unit 50 are provided with the side surface 13 sandwiched therebetween.

[0063] The tip 511d faces the tip 521d with the side surface 13 in between. The tip 511e faces the tip 522e with the side surface 13 in between.

[0064] By arranging cores 511 and 521 in this manner, a magnetic field is generated between tips 511d and 521d, and between tips 511e and 521e. In addition, the distance between tips 511d and 521d and bottom surface 12 is short, and the distance between tips 511e and 522e and bottom surface 12 is also short, so that the generated magnetic field is strong.

[0065] According to this embodiment, by opposing the tips 511d and 521d and the tips 511e and 522e across the bottom surface 12, a pair of strong magnetic fields is generated, and power can be supplied with a magnetic body sandwiched between them. Also, data can be transmitted from the external member 51 to the internal member 52. Furthermore, by measuring the impedance of the internal member 52, the external member 51 can receive data from the internal member 52.

[0066] In the present embodiment, the wireless power supply unit 50 is disposed near the bottom surface 12 of the side surface 13, but the location of the wireless power supply unit 50 is not limited thereto. For example, the wireless power supply unit 50 may be disposed near the head 15 of the side surface 13. Moreover, instead of the wireless power supply unit 50, a wireless power supply unit 50A, i.e., an external member 51 and an internal member 52 may be provided to sandwich the side surface 13 therebetween.

[0067] Although the embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes within the scope of the gist of the present invention are also included. For example, the above example has been described in detail to clearly explain the present invention, and is not necessarily limited to those having all of the configurations described. In addition, it is possible to replace a part of the configuration of the embodiment with the configuration of another embodiment, and it is also possible to add, delete, or replace other configurations to the configuration of the embodiment.

[0068] In addition, "approximately" is a concept that includes not only the case of being strictly identical, but also an error or deformation that does not lose the identity. For example, "cylindrical shape" is not limited to the case of being strictly cylindrical, but is a concept that includes, for example, a case that can be regarded as being identical to a cylindrical shape. In addition, for example, when expressing orthogonal, parallel, coincident, etc., it includes not only strictly orthogonal, parallel, coincident, etc., but also approximately parallel, approximately orthogonal, approximately coincident, etc.

[0069] In addition, "vicinity" means including a certain range (which can be determined arbitrarily) near a reference position. For example, in the case of "near an end," it is a concept indicating a certain range of an area near the end, which may or may not include the end. [Explanation of symbols]

[0070] 1, 2, 3: Filter device 10: Housing 11: Case 12: Bottom 13: Side 15: Head 15a: Cylindrical part 15b: Central tube 15c, 15e: Hole 15d: Hole 17: Mounting material 20: Filter element 21: Filter medium 22: Inner cylinder 23: Outer cylinder 24, 25: Plate 30: Holder 40: Conductive part 41: Elastic member 42: Bypass valve 43: Sealing material 50, 50A: Wireless power supply unit 51, 51A: External components 52, 52A: Internal components 55: External circuit 55a: Power supply section 55b: Acquisition part 56: Internal circuit 56a: Receiving section 56b: Adjustment section 60: Sensor 511, 511A, 521, 521A: Core 511a, 511b, 511f, 521a, 521b, 521f: End member 511c, 511h, 521c, 521h: Connection part 511d, 511e, 511g, 521d, 521e, 521g: Tip 511i, 521i: Protrusion 512, 512A, 522, 522A: Coil

Claims

1. Filter element and The housing in which the filter element is provided, A wireless power supply unit having an external member provided on the outside of the housing, an internal member provided on the inside of the housing, and a power supply unit that supplies power to an external coil of the external member, Equipped with, The housing has a metal plate-like portion made of a ferromagnetic material, The external member and the internal member are provided with the plate-like portion in between, The external member has an external core on which the external coil is provided, The internal member comprises an internal coil and an internal core in which the internal coil is provided. The external core has a first end member and a first connecting portion on which the external coil is provided. The internal core has a second end member and a second connecting portion on which the internal coil is provided. A filter device characterized in that the first end, which is the tip of the first end member, and the second end, which is the tip of the second end member, face each other at multiple separate positions with the plate-like portion in between.

2. The outer core and the inner core are formed from rod-shaped or strip-shaped members. The first end member has a third end member and a fourth end member that are spaced apart from each other. The first connecting portion connects the third end member and the fourth end member, The second end member has a fifth end member and a sixth end member that are spaced apart from each other. The second connecting portion connects the fourth end member and the fifth end member, The third end, which is the tip of the third end member, faces the fifth end, which is the tip of the fifth end member, with the plate-like portion in between. The filter device according to claim 1, characterized in that the fourth end, which is the tip of the fourth end member, faces the sixth end, which is the tip of the sixth end member, with the plate-like portion in between.

3. The first end member and the second end member are formed into a cylindrical shape by curving a strip-shaped member. The first connecting portion is provided in the hollow part of the cylindrical first end member, The second connecting portion is provided in the hollow part of the cylindrical second end member. The filter device according to claim 1.

4. The power supply unit modulates the current flowing through the external coil. The filter device according to any one of claims 1 to 3.

5. An adjustment unit that changes the impedance of the circuit including the internal coil, An acquisition unit that acquires the change in the impedance of the circuit caused by the adjustment unit by measuring the current flowing through the external coil, A filter device according to any one of claims 1 to 3, characterized by comprising:

6. The housing includes a sensor provided inside the housing and adjacent to the internal component, The adjustment unit changes the impedance based on the measurement results of the sensor. The filter device according to claim 5.

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