JP2007335277A - Noise eliminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small noise eliminator capable of using an existing electronic casing and cable without change without requiring redesigning and additional work and of eliminating noise in high frequency bands. <P>SOLUTION: The noise eliminator 1 is provided with a female connector part 2, a male connector part 3 and a main body part 4. The female connector part 2 is connectable to a cable connector of an external cable so as to be insertable/removable, and the male connector part 3 is connectable to an equipment side connector of electronic equipment so as to be insertable/removable. The main body part 4 has a common mode choke coil 40 comprising first and second coils 41, 42. The first coil 41 is connected between a first contactor 21 of the female connector part 2 and a third contactor 31 of the male connector part 3, and the second coil 42 is connected between a second contactor 22 and a fourth contactor 32. Preferably, a laminated chip coil is used for the common mode choke coil 40 of the main body part 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a noise remover for removing noise that has entered a power cable or an inter-device cable.

Conventionally, as this type of technology, for example, there are technologies disclosed in Patent Literature 1 and Patent Literature 2. In these techniques, a ring-shaped ferrite core is fitted to the outside of a cable to try to attenuate noise in the cable with the ferrite core.
As other techniques, for example, there are techniques disclosed in Patent Document 3 and Patent Document 4. In these technologies, an inductor or a filter circuit is built in a connector portion of a cable, and noise is filtered by the inductor or the like.

JP 2001-185891 A JP 61-029528 A JP 2001-160463 A Japanese Patent Laid-Open No. 02-068520

However, the conventional techniques described above have the following problems.
In the technology to reduce noise by fitting a ferrite core to the outside of the cable, it is necessary to fix the ferrite core to the housing of the electronic device, which requires redesigning the housing and attaching the ferrite core to the housing It becomes. Furthermore, the ferrite core has a low ability to remove high frequency noise such as common mode noise.
On the other hand, in the technology that incorporates an inductor etc. in the connector part of the cable and performs noise filtering, it is necessary to remove the connector of the original cable and attach a new connector containing the inductor etc. to the cable to make a dedicated cable. is there. For this reason, it is necessary to redesign the cable and attach a new connector. Furthermore, since a spiral coil-shaped inductor, a choke coil in which a coil is wound around a core, or the like is built in the connector, it is difficult to reduce the size of the connector.

  The present invention has been made to solve the above-described problems, and can be used as it is, without redesigning or performing extra work, and can be used as it is, and is small and has a high frequency band. An object of the present invention is to provide a noise remover that can also remove noise.

In order to solve the above-mentioned problems, the invention of claim 1 is a first connector portion that can be inserted into and removed from a cable connector attached to an external cable, and a device that is disposed in a casing of an electronic device and can be connected to the cable connector. A second connector portion that can be inserted into and removed from the side connector, and the first and second connector portions are connected to the input and output ends, respectively, to remove noise that has entered from one of the first and second connector portions. A noise eliminator comprising a main body, wherein the external cable has at least a pair of lines, and the cable connector has first and second contacts respectively connected to the pair of lines, and a device-side connector Has a third and a fourth contact that can come into contact with the first and second contacts, respectively, and the noise removing main body is a common mode choke coil composed of a first and a second coil. The first connector portion has first and second contacts that are connected to one ends of the first and second coils, respectively, and can be removably contacted with the first and second contacts of the cable connector. The second connector portion has third and fourth contacts that are connected to the other ends of the first and second coils, respectively, and can be removably contacted with the third and fourth contacts of the device-side connector. It was.
With such a configuration, the noise remover can be interposed between the electronic device and the external cable simply by inserting the first connector portion into the cable connector of the external cable and inserting the second connector portion into the device-side connector. it can. When noise enters the noise eliminator from the external cable or the electronic device through the first and second connector parts, the noise is removed by the noise removing main body part. At this time, the first and second contactors of the first connector portion connected to one end of the first and second coils of the common mode choke coil of the noise elimination main body portion are the first and second contactors of the cable connector. Since the third and fourth contacts of the second connector portion connected to the other ends of the first and second coils are in contact with the third and fourth contacts of the device-side connector, high frequency Even if the common mode noise enters the external cable or the like, it can be removed by the common mode choke coil.

  According to a second aspect of the present invention, in the noise eliminator according to the first aspect, each of the first and second coils of the common mode choke coil is covered with a magnetic material from the first connector portion to the second connector portion. It was set as the structure which is a spiral coil which goes to.

  According to a third aspect of the present invention, in the noise eliminator according to the first aspect, the common mode choke coil is a multilayer type formed by laminating the conductor pattern of the first coil and the conductor pattern of the second coil in a magnetic body. The configuration is a chip coil.

The invention according to claim 4 is the noise remover according to any one of claims 1 to 3, wherein the external cable is a cable of an AC adapter having a ground line and a DC power line as a pair of lines, The cable connector has a cylindrical first contact connected to the ground line, and a pin-shaped second contact located at the center of the first contact with the DC power supply line connected. The device-side connector includes a cylindrical third contact that can be fitted with the first contact of the cable connector, and a pin-shaped first contact that is located at the center of the third contact and that can be contacted with the second contact. The first connector portion is connected to one end of the first coil and can be fitted to the first contact of the cable connector, and one of the second coils. Located at the center of the first contact with the end connected A second contact of a pin shape that can contact the second contact of the cable connector, and the second connector portion is connected to the other end of the first coil and can be fitted to the third contact of the device side connector. A cylindrical third contactor and a pin-like fourth contactable with the fourth contactor of the device-side connector located at the center of the third contactor in a state where the other end of the second coil is connected. It was set as the structure which has a contact.
According to such a configuration, the pin-shaped second contactor of the first connector part and the cable can be obtained by fitting the cylindrical first contactor of the first connector part to the cylindrical first contactor of the cable connector. The second contact of the connector comes into contact. Further, by fitting the cylindrical third contactor of the second connector part into the cylindrical third contactor of the apparatus side connector, the pin-shaped fourth contactor of the second connector part and the apparatus side connector It will be in the state which contacted the pin-shaped 4th contact. Then, high-frequency common mode noise flowing in the same direction through a ground line and a DC power line of an AC (Alternating Current) adapter is removed by the common mode choke coil of the noise removing main body.

According to a fifth aspect of the present invention, in the noise eliminator according to any one of the first to fourth aspects, the third contact between the first contact and the second contact of the first connector portion or the second connector portion. A dielectric is interposed between the child and the fourth contact.
With this configuration, a capacitor is formed either between the first contact and the second contact of the first connector part or between the third and fourth contact of the second connector part. Thereby, normal mode noise flowing through one of the pair of lines is returned to the other line through this capacitor.

  As described above in detail, according to the noise eliminator according to the present invention, the noise removing main body portion having the common mode choke coil can be obtained simply by inserting the first and second connector portions into the cable connector and the device side connector. Since it can be easily interposed between the electronic device and the external cable, the noise eliminator can be mounted without redesigning or processing the electronic device casing or the external cable. As a result, there is an excellent effect that the noise removing device mounting operation can be facilitated and shortened. In addition, since the noise is removed by the common mode choke coil, there is an effect that noise in a high frequency band can also be removed.

  In particular, according to the noise filter of the third aspect of the present invention, since the multilayer chip coil is applied as the common mode choke coil, it is possible to reduce the size of the noise removing main body, and hence the size of the noise removing device itself. There is an effect that can be.

  In addition, according to the noise filter of the fifth aspect of the invention, not only common mode noise but also normal mode noise can be efficiently removed, so that various noises can be removed in a wide band. is there.

  The best mode of the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view of a noise remover according to the first embodiment of the present invention, and FIG. 2 is an external view of the noise remover.

  As shown in FIGS. 1 and 2, the noise remover 1 of this embodiment includes a female connector portion 2 as a first connector portion, a male connector portion 3 as a second connector portion, and a main body portion as a noise removing main body portion. 4 and comprising.

The noise eliminator 1 is an instrument that can be connected between a cable connector of an external cable and a device-side connector provided in an electronic device.
FIG. 3 is a cross-sectional view showing the cable connector 120 of the AC adapter 100 and the device-side connector 210 of the electronic device 200 that can use the noise eliminator 1.
As shown in FIG. 3, the AC adapter 100 is a well-known adapter, and a standardized male cable connector 120 is inserted into a standardized female device-side connector 210 on the electronic device 200 side. DC power is supplied to the electronic device 200.
Specifically, the external cable 110 has a ground line and a DC power line (not shown), and the cable connector 120 is connected to the cylindrical first contact 121 connected to the ground line and the DC power line. And a pin-shaped second contact 122 arranged in the center of the first contact 121 in a state.
On the other hand, the device-side connector 210 is attached to the housing of the electronic device 200 and has a third contactor 211 to which the ground line 201 is connected and a fourth contactor 212 to which the DC power supply line 202 is connected. The cable connector 120 of the AC adapter 100 can be connected.
Specifically, the third contact 211 has a cylindrical shape into which the first contact 121 of the cable connector 120 can be inserted. The fourth contact 212 has a pin shape and is located at the center of the third contact 211. The fourth contact 212 has a hole 212a that opens to the outside. When the first contact 121 of the cable connector 120 is fitted into the third contact 211, the second contact 122 is inserted into the hole 212a. The fourth contact 212 and the second contact 122 are connected to each other.

Therefore, as shown in FIG. 1, the female connector portion 2 of the noise eliminator 1 has a structure corresponding to the device-side connector 210 of the electronic device 200, and the male connector portion 3 is connected to the cable connector 120 of the AC adapter 100. It has a corresponding structure.
4 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 5 is a front view of the female connector portion 2, and FIG. 6 is a front view of the male connector portion 3.
That is, as shown in FIGS. 4 and 5, the female connector portion 2 has substantially the same structure as the device-side connector 210 and can be removably contacted with the first and second contactors 121 and 122 of the cable connector 120. The first and second contactors 21 and 22 are provided. Specifically, the first contactor 21 has a cylindrical shape into which the first contactor 121 of the cable connector 120 can be inserted, and the second contactor 22 has a pin shape. 21 is located in the center. The second contactor 22 also has a hole 22a that opens to the outside. When the first contactor 121 of the cable connector 120 is fitted into the first contactor 21, the second contactor 122 is inserted into the hole 22a. Thus, connection between the second contact 22 and the second contact 122 is achieved.

  Further, as shown in FIGS. 4 and 6, the male connector portion 3 has substantially the same structure as the cable connector 120, and can be removably contacted with the third and fourth contacts 211, 212 of the device-side connector 210. The third and fourth contacts 31 and 32 are provided. Specifically, the third contact 31 has a cylindrical shape that can be inserted inside the third contact 211 of the device-side connector 210. The fourth contact 32 has a pin shape and is located at the center of the third contact 31. Then, when the third contact 31 is inserted into the third contact 211 of the device-side connector 210, the fourth contact 32 is inserted into the hole 212a of the fourth contact 212, and the fourth contact 32 Connection with the fourth contact 212 is achieved.

The main body 4 is a part that removes intruding noise, and the common mode choke coil 40 is provided in a resin cylindrical body 43 filled with a magnetic body 44, and the input and output ends of the common mode choke coil 40 are connected to the male part. The connector part 3 and the male connector part 3 are connected to each other.
Specifically, the common mode choke coil 40 includes spiral first and second coils 41 and 42 wound in parallel. Specifically, the right end 41a of the first coil 41 is connected to the first contact 21 of the female connector portion 2, the left end 41b is connected to the third contact 31 of the male connector portion 3, and the right end of the second coil 42 is connected. The part 42 a was connected to the second contact 22 of the female connector 2, and the left end 42 b was connected to the fourth contact 32 of the male connector 3. That is, the first coil 41 of the common mode choke coil 40 is connected to the ground line, and the second coil 42 is connected to the DC power supply line.

Next, the operation and effect exhibited by the noise remover 1 of this embodiment will be described.
FIG. 7 is a perspective view showing an interposing method of the noise remover 1, and FIG. 8 is a cross-sectional view showing an interposing state of the noise remover 1.
As shown in FIG. 7, the female connector 2 of the noise eliminator 1 faces the cable connector 120 side of the AC adapter 100 and the male connector 3 faces the device side connector 210 side of the electronic device 200. The part 2 and the male connector part 3 are inserted into the cable connector 120 and the device-side connector 210, respectively. Then, as shown in FIG. 8, the first and second contacts 21 and 22 of the female connector portion 2 are in contact with the first and second contacts 121 and 122 of the cable connector 120, respectively. The third and fourth contacts 31 and 32 are in contact with the third and fourth contacts 211 and 212 of the device-side connector 210. As a result, the cable connector 120 and the device-side connector 210 are electrically connected via the noise remover 1.
That is, according to the noise eliminator 1 of this embodiment, the main body 4 having the common mode choke coil 40 can be obtained by simply inserting the female connector 2 and the male connector 3 into the cable connector 120 and the device-side connector 210. Can be easily interposed between the electronic device and the external cable. For this reason, when the noise eliminator 1 is mounted, there is no need to perform a redesign or soldering operation on the casing of the electronic device 200 or the external cable 110.

FIG. 9 is an equivalent circuit diagram for explaining the noise removing action of the noise remover 1.
In the state in which the noise eliminator 1 is interposed, high-frequency common mode noise N flowing in the same direction through the ground line and the DC power supply line of the external cable 110 is generated through the female connector 2 as indicated by arrows in FIG. When entering the remover 1, the common mode noise N enters the first coil 41 and the second coil 42 and is removed by the high impedance of the magnetic body 44 and the first and second coils 41 and 42.
Thus, according to the noise remover 1 of this embodiment, there is an effect that common mode noise in a high frequency band can be removed.

Next explained is the second embodiment of the invention.
FIG. 10 is a schematic sectional view showing a noise eliminator according to the second embodiment of the present invention, showing a connection state between the conductor pattern 72 and the second contactor 22 and the fourth contactor 32. FIG. FIG. 12 is a schematic cross-sectional view of a noise remover showing a connection state between the conductor pattern 71 and the first contact 21 and the third contact 31, FIG. 12 is an external view of the common mode choke coil 6, and FIG. FIG. 14 is an external view of the main body 5, and FIG. 14 is an exploded perspective view of the common mode choke coil 6.
As shown in FIG. 10, in this embodiment, the structure of the main body is different from the structure of the main body 4 of the first embodiment.
That is, as shown in FIGS. 10 to 12, the main body 5 is configured by covering a common mode choke coil 6, which is a multilayer chip coil, with a resin 60.

  As shown in FIG. 12, the common mode choke coil 6 is a chip-shaped laminated coil. An insulator 63 including first and second coils (not shown) is sandwiched between magnetic substrates 61 and 62, and external electrodes are arranged. The structure which attached 81-84 on the outer side is comprised. Such a common mode choke coil 6 can be formed by a pattern printing method, a photolithography method or the like.

Specifically, as shown in FIG. 14, the insulator 63 is formed by stacking a plurality of insulating layers 64 to 66, and a conductor pattern 71 as a first coil is formed on the insulating layer 65. An insulating layer 64 was laminated thereon. The internal electrodes 71c and 71d were laminated on the insulating layer 64, and the internal electrodes 71c and 71d and the end portions 71a and 71b of the conductor pattern 71 were connected through the through holes 64a and 64b. Then, the magnetic substrate 62 was laminated on the insulating layer 64. A conductor pattern 72 as a second coil was formed on the insulating layer 66 below the insulating layer 65. Then, internal electrodes 72c and 72d were formed on the magnetic substrate 61, and the internal electrodes 72c and 72d and the end portions 72a and 72b of the conductor pattern 72 were connected through through holes 66a and 66b.
Then, the external electrodes 81 to 84 were attached to the outside of the chip body composed of the insulator 63 including the conductor patterns 71 and 72 and the magnetic substrates 61 and 62. Specifically, as shown in FIGS. 12 and 14, a U-shaped external electrode 81 is attached to the back side of the right side surface of the chip body, and the external electrode 81 and the internal electrode 71c are electrically connected. A U-shaped external electrode 82 was attached to the back side of the left side surface of the chip body, and the external electrode 82 and the internal electrode 71d were electrically connected. Then, the protruding terminals 81a and 82a are protruded from the lower end portion 81b and the upper end portion 82b of the external electrodes 81 and 82, respectively. Thus, the protruding terminal 81a is connected to the outer end 71a of the conductor pattern 71 through the internal electrode 71c, and the protruding terminal 82a is connected to the inner end 71b of the conductive pattern 71 through the internal electrode 71d.
An external electrode 83 having an upper end 83b extending to the center of the upper surface of the magnetic substrate 62 is attached to the front side of the left side surface of the chip to electrically connect the external electrode 83 and the internal electrode 72c. The external electrode 84 extended to the center of the lower surface of the magnetic substrate 61 was attached to the front side of the right side surface of the chip body, and the external electrode 84 and the internal electrode 72d were electrically connected. Then, the protruding terminals 83a and 84a are projected from the upper end 83b and the lower end 84b of the external electrodes 83 and 84, respectively. Thus, the protruding terminal 83a is connected to the outer end 72a of the conductor pattern 72 through the internal electrode 72c, and the protruding terminal 84a is connected to the inner end 72b of the conductor pattern 72 through the internal electrode 72d.

  As shown in FIG. 13, the main body 5 is formed by covering a laminated common mode choke coil 6 with a resin 60. At this time, the end surfaces of the projecting terminals 81 a and 82 a that form both ends of the conductor pattern 71 and the end surfaces of the projecting terminals 83 a and 84 a that form both ends of the conductor pattern 72 are exposed from the resin 60.

As shown in FIGS. 10 and 11, the main body 5 is interposed between the female connector 2 and the male connector 3.
Specifically, as shown in FIG. 10, the body portion 5 is interposed between the female connector portion 2 and the male connector portion 3 with the magnetic substrate 61 side facing the right side, and the protruding terminal of the conductor pattern 72 is provided. 84 a and the second contactor 22 of the female connector part 2 were connected, and the protruding terminal 83 a and the fourth contactor 32 of the male connector part 3 were connected. Thus, in the connected state, as shown in FIG. 11, the protruding terminal 81a of the conductor pattern 71 and the first contact 21 of the female connector portion 2 are connected, and the protruding terminal 82a and the third contact of the male connector portion 3 are connected. The child 31 is connected.

With this configuration, the main body 4 can be reduced in size and height, and noise in the high frequency band can be removed as in the first embodiment.
The inventors performed the following simulation in order to confirm the noise removal effect in the high frequency band in the noise remover of this embodiment.
FIG. 15 is a diagram showing common mode impedances generated when a ferrite core is used and when the noise eliminator of this embodiment is used.
First, a ferrite core is fitted to the outside of the external cable 110 of the AC adapter 100 shown in FIG. 3, and the cable connector 120 is directly connected to the device-side connector 210 of the electronic device 200, and the common mode impedance from 1 MHz to 1000 MHz is calculated. As a result, a result indicated by a dashed impedance curve S1 was obtained. According to such a result, although the impedance increases somewhat toward the high frequency band, it cannot be said that it is sufficient.
On the other hand, the common mode impedance from 1 MHz to 1000 MHz was calculated by interposing the noise remover of this embodiment between the cable connector 120 of the external cable 110 with the ferrite core removed and the device side connector 210. However, a result indicated by a solid impedance curve S2 was obtained. According to such a result, it was confirmed that the impedance rapidly increases as it goes to the high frequency band, and in particular, a high noise removal effect is obtained for high frequency common mode noise of 200 MHz to 1000 MHz.
Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof is omitted.

Next explained is the third embodiment of the invention.
FIG. 16 is a sectional view showing a noise remover according to the third embodiment of the present invention. FIG. 17 is an equivalent circuit diagram for explaining the noise removing action of the noise remover of the third embodiment.
This embodiment differs from the first and second embodiments in that a dielectric 9 is interposed between the first contact 21 and the second contact 22 of the female connector portion 2.
Specifically, as shown in FIG. 16, a cylindrical dielectric 9 having a predetermined thickness is inserted into the first contact 21 so as to cover the second contact 22 of the female connector portion 2, and the cable connector 120. The space 90 into which the first contact 121 can be inserted is formed between the dielectric 9 and the first contact 21.

  With this configuration, the male connector portion 3 of the noise eliminator 1 can be connected to the device-side connector 210 (see FIG. 3) of the electronic device 200, and the first contact 121 (see FIG. 3) of the cable connector 120. Can be inserted into the space 90 of the female connector portion 2, and the second contact 122 (see FIG. 3) can be brought into contact with the second contact 22. As a result, as shown in FIG. 17, the capacitor C is formed between the second contact 22 of the female connector portion 2 and the first contact 121 of the cable connector 120.

In this state, as indicated by a broken line arrow, when high-frequency common mode noise N enters from the female connector portion 2, it enters the noise remover 1 without being blocked by the capacitor C. As a result, the common mode noise N is removed by the common mode choke coil 40 as in the above embodiment.
As indicated by the solid line arrow, when the normal mode noise M enters the female connector portion 2 from the second contact 122 through the DC power line, the normal contact noise M is returned from the second contact 22 to the first contact 121 through the capacitor C.

Thus, according to this embodiment, not only common mode noise but also normal mode noise can be efficiently removed, so that various types of noise can be removed in a wide band.
Other configurations, operations, and effects are the same as those in the first and second embodiments, and thus description thereof is omitted.

In addition, this invention is not limited to the said Example, A various deformation | transformation and change are possible within the range of the summary of invention.
For example, in the above embodiment, the external cable 110 of the AC adapter 100 is applied as the external cable, and the noise remover that can be connected to the cable connector 120 used for the external cable 110 and the device-side connector 210 of the electronic device 200 is used. Although illustrated, cables such as USB (Universal Serial Bus), DVI (Digital Visual Interface), HDMI (High Definition Multimedia Interface), IEEE (Institute of Electrical and Electronic Engineers) 1394, etc. are used as external cables. Of course, it can also be done. In such a case, the structure of the first and second connector parts of the noise remover is set in correspondence with the connector structure of these standards.
In the third embodiment, the dielectric 9 is interposed between the first contact 21 and the second contact 22 of the female connector 2. However, the third contact 31 and the fourth contact 4 of the male connector 3 are used. Of course, it may be interposed between the contacts 32.

1 is an exploded perspective view of a noise remover according to a first embodiment of the present invention. It is an external view of a noise remover. It is sectional drawing which shows the cable connector of the AC adapter which can use this noise remover, and the apparatus side connector of an electronic device. It is arrow AA sectional drawing of FIG. It is a front view of a female connector part. It is a front view of a male connector part. It is a perspective view which shows the insertion method of a noise remover. It is sectional drawing which shows the intervention state of a noise remover. It is an equivalent circuit diagram for demonstrating the noise removal effect | action of a noise remover. It is a schematic sectional drawing which shows the noise remover which concerns on 2nd Example of this invention. It is a schematic sectional drawing of the noise remover which shows the connection state of a conductor pattern, a 1st contactor, and a 3rd contactor. It is an external view of a common mode choke coil. It is an external view of a main-body part. It is a disassembled perspective view of a common mode choke coil. It is a diagram which shows the common mode impedance which arises, respectively when the ferrite core is used and when the noise remover of this embodiment is used. It is sectional drawing which shows the noise remover which concerns on 3rd Example of this invention. It is an equivalent circuit diagram for demonstrating the noise removal effect | action of the noise remover of 3rd Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Noise remover, 2 ... Female connector part, 3 ... Male connector part, 4, 5 ... Main-body part, 6,40 ... Common mode choke coil, 9 ... Dielectric, 21, 121 ... 1st contactor, 22, 122 ... 2nd contact, 22a, 212a ... hole, 31, 211 ... 3rd contact, 32, 212 ... 4th contact, 41 ... 1st coil, 42 ... 2nd coil, 43 ... Resin cylindrical body, 44 ... magnetic material 60 ... resin 61,62 ... magnetic substrate 63 ... insulator 71,72 ... conductor pattern 90 ... space part 100 ... AC adapter 110 ... external cable 120 ... cable connector 200 ... electronic equipment, 210 ... device-side connector.

Claims (5)

A first connector portion that can be inserted into and removed from a cable connector attached to an external cable; a second connector portion that is provided in a housing of an electronic device and that can be connected to the cable connector; A noise remover comprising a noise removing body portion for removing noise intruding from one of the first and second connector portions, wherein the first and second connector portions are connected to the input and output ends, respectively;
The external cable has at least a pair of lines,
The cable connector has first and second contacts respectively connected to the pair of lines.
The device-side connector has third and fourth contacts that can contact the first and second contacts, respectively.
The noise removing main body has a common mode choke coil composed of first and second coils,
The first connector portion includes first and second contacts that are connected to one ends of the first and second coils, respectively, and can be removably contacted with the first and second contacts of the cable connector. ,
The second connector portion includes third and fourth contacts that are connected to the other ends of the first and second coils, respectively, and that can be removably contacted with the third and fourth contacts of the device-side connector. ,
A noise remover characterized by that. The noise remover according to claim 1, wherein
Each of the first and second coils of the common mode choke coil is a spiral coil that is directed from the first connector part to the second connector part in a state of being covered with a magnetic material.
A noise remover characterized by that. The noise remover according to claim 1, wherein
The common mode choke coil is a laminated chip coil formed by laminating a conductor pattern of the first coil and a conductor pattern of the second coil in a magnetic body.
A noise remover characterized by that. The noise remover according to any one of claims 1 to 3,
The external cable is an AC adapter cable having a ground line and a DC power line as the pair of lines,
The cable connector includes the cylindrical first contact connected to the ground line, and the pin-shaped second contact located at the center of the first contact with the DC power supply line connected. Have a child,
The device-side connector includes a cylindrical third contactor into which the first contactor of the cable connector can be fitted, and a pin that is located at the center of the third contactor and can be contacted with the second contactor Said fourth contact in the shape of
The first connector part is connected to one end of the first coil and is connected to the first contact of the cable connector and the one end of the second coil. The pin-shaped second contactor that is located in the center of the first contactor and can contact the second contactor of the cable connector
The second connector portion is connected to the cylindrical third contact that is connected to the other end of the first coil and can be fitted to the third contact of the device-side connector, and the other end of the second coil. A pin-like fourth contactor located in the center of the third contactor in a state of being contacted with the fourth contactor of the device-side connector,
A noise remover characterized by that. The noise remover according to any one of claims 1 to 4,
A dielectric is interposed between the first contact and the second contact of the first connector part or between the third contact and the fourth contact of the second connector part.
A noise remover characterized by that.

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