JP2003273567A - Noise current absorption tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise current absorption tool by which fitting position can be easily adjusted. <P>SOLUTION: A press-fit part 21 of a fixed part 20 is press-fitted into a fitting hole (not illustrated) that is formed adjacent to a receptacle S for power supply connection provided on an enclosure K of a personal computer or the like so that a base part 1 is fitted to the enclosure K. In addition, a core holding part 30 is fitted to a cable C provided with a paired plug P of the receptacle S to fasten the cable with a circular magnetic core. A band 10 of the base part 1 fitted to the enclosure K is inserted and passed through a band insertion hole of an engaging part 40 formed integrally with the core holding part 30 so that the base part 1 and a movable part 3 are integrally connected. An operation piece 43 is operated to slide the movable part 3 on the band 10, thereby adjusting a distance between the fixed part 20 and the core holding part 30, namely, the fitting position of a magnetic material core 36 so that it may has a most effective distance for the absorption of noise current. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise current absorber which surrounds an outer circumference of an electric wire with a magnetic material and absorbs a noise current flowing through the electric wire by the magnetic material.

[0002]

2. Description of the Related Art Conventionally, there has been known a noise current absorber in which an outer peripheral portion of an electric wire is surrounded by a magnetic material core such as ferrite and the magnetic material absorbs a noise current flowing through the electric wire.
In this type of noise current absorber, in order to easily fit the magnetic core to the electric wire without removing the existing wiring, for example, as disclosed in Japanese Utility Model Laid-Open No. 63-39997. , An annular magnetic core formed by dividing the magnetic core into two parts on a division surface including an axis, a pair of case portions for accommodating the respective divided pieces of the magnetic core, and the accommodated divided pieces are combined in the original annular shape. As described above, a noise current absorber including a holding case having a fixing mechanism (a protrusion and a hook that engage with each other) for fixing a pair of case parts is widely used.

The effect of this type of noise current absorber varies greatly depending on the mounting position on the cable.
It is necessary to fix the mounting position at an appropriate place. Therefore, in the noise current absorber, for example, in the notch portion of the case portion forming a cable insertion hole for inserting a cable,
Locking claws and the like protruding toward the cable insertion hole are provided. That is, when the noise current absorber is attached to the cable, the noise claw absorber is fixed to the cable by engaging the locking claw with the coating of the cable arranged in the cutout portion of the case portion.

[0004]

By the way, in order to find a mounting position where the effect of the noise current absorber is sufficiently obtained,
It is necessary to adjust the mounting position. However, in the conventional noise current absorber that is fixed to the cable by the locking claws, when moving the mounting position, it is necessary to open the case part, once remove it from the electric wire, and attach it again to the electric wire. However, there was a problem that it was very troublesome.

Therefore, an object of the present invention is to provide a noise current absorber whose mounting position can be easily adjusted in order to solve the above problems.

[0006]

The invention according to claim 1 made in order to achieve the above object, is a noise current absorber which is used by being attached to a cable and which absorbs a noise current flowing through the cable. A core holding portion that holds an annular magnetic core externally fitted to the cable and is slidable with respect to the cable; a fixing portion that is fixed to the cable or an attachment object to which the cable is attached; It is characterized in that it is provided with a connecting portion that connects the holding portion and the fixed portion and that can change the distance between the both.

In the noise current absorber of the present invention having the above-described structure, the core holding portion is mounted on the cable separated from the position where the fixing portion is fixed by the distance set by the connecting portion. Moreover, since the core holding portion is configured to be slidable with respect to the cable, if the interval set by the connecting portion is changed, the mounting position of the core holding portion also moves in conjunction with this.

As described above, according to the noise current absorber of the present invention, the mounting position of the core holding portion can be easily changed without removing the core holding portion, and the mounting position of the core holding portion can be adjusted. The labor of can be greatly reduced.
When the magnetic core is composed of a plurality of split pieces that are split in the axial direction of the magnetic core, as described in claim 2, the core holding portion includes a case portion that stores each split piece, It suffices to use a member that is configured to be engageable and disengageable and that has a fixing mechanism that fixes the case portion such that the divided pieces housed in the case portion are combined in an annular shape.

In this case, since it is not necessary to insert the cable into the magnetic core in advance and the magnetic core can be attached to the cable afterwards, the noise current absorber can be applied to various cables. By the way, the fixing portion may have a shape to be mounted by elastically deforming the fixing portion with respect to an attachment hole formed in a wall surface of an object to be attached. As described in claim 4, the sticking plate may be stuck to the wall surface of the attachment target.

The place where the mounting hole is formed and the position where the sticking plate is stuck can be, for example, near an outlet or a connector paired with a plug connected to a cable. In such a case, not only can the magnetic core be attached near the plug, but when a force is applied to the cable in the direction to pull out the plug, the area around the plug formed with a diameter larger than the cable contacts the core holding part. Since they come into contact with each other and their movement is restricted, the plug can be prevented from falling off.

Further, in particular, when the fixing portion is composed of an adhesive plate, for example, the adhesive plate is, as described in claim 5,
An opening for exposing an outlet or a connector formed on the attachment object may be formed. In this case, the noise current absorber can be firmly fixed near the outlet or the connector.

Further, the fixing portion has a structure as described in claim 6.
It may be a clamp that holds the cable. In this case, the magnetic core can be externally fitted to any position on the cable. Next, as described in claim 7, the connecting portion can be locked at the elongated band portion and at any position on the band portion, or at a plurality of predetermined positions. The core holding portion and the fixing portion may be fixed to the band portion and the other portion to the locking portion.

In this case, it is preferable that at least one of the core holding portion and the fixing portion and the connecting portion are detachably configured. That is, if it is detachable in this way, the core holding portion and the fixing portion can be individually attached and later connected, so that the attachment work can be facilitated. Further, particularly when the fixing part is fixed to the attachment target, the core holding part or the fixing part is attached to the cable or the attachment target only by attaching / detaching the core holding part or the fixing part and the connecting part. As it is, the cable can be attached to and detached from the attachment target.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] As shown in Figs. 1 to 3, the noise current absorber according to the first embodiment is a strip-shaped band portion 10 having a ratchet 11 (see Fig. 2) formed on the back surface thereof, and a band portion. The base portion 1 formed of a fixing portion 20 formed at one end in the longitudinal direction of 10, a core holding portion 30 that holds an annular magnetic core that is externally fitted to the cable, and the core holding portion 30 in the band portion 10. The movable part 3 includes a locking part 40 for slidably mounting along the longitudinal direction, and the base part 1 and the movable part 3 are integrally formed of an elastic material.

The band portion 10 and the locking portion 40 correspond to the connecting portion in the present invention. 1A and 1B are perspective views showing the configuration of the noise current absorber, where FIG. 1A shows a state in which the movable portion 3 is removed from the base 1, and FIG. 1B shows a state in which the movable portion 3 is attached to the base 1. . FIG. 2 is a perspective view of the base portion 1 as viewed from the back side, and FIG. 3A is a front view of the movable portion 3,
(B) is a partial sectional view thereof.

Of these, the fixed portion 20 constituting the base portion 1
Is for fixing the base portion 1 itself to a rectangular mounting hole formed in a mounting object such as a personal computer casing or an office wall. The plate-shaped leaf spring portion that protrudes from the root of the press-fitting portion 21 to both sides in the width (widthwise) direction of the band portion 10 and is pressed against the surface of the attachment target when the press-fitting portion 21 is press-fitted into the mounting hole. And 22.

Further, the core holding portion 30 which constitutes the movable portion 3
Is a pair of case portions 31 and 32, which accommodates the respective divided pieces of the annular magnetic core 36 formed by dividing the divided surface including the axis, and is connected via a hinge 35, and the case portions 31 and 32. It is composed of a fixing mechanism (protrusions 33 and hooks 34 that engage with each other) for fixing the case portions 31 and 32 so that the divided pieces housed in 32 are combined in the original annular shape.

The core holding portion 30 having the above structure is
The protrusion 33 and the hook 34 are disengaged to expose the divided pieces held by both the case portions 31 and 32, and the cable is arranged in a concave portion for forming a cable insertion hole formed in the divided pieces. Then, in this state, the case portions 31 and 32 are closed to each other, and the hook 34 is engaged with the protrusion 33, so that the magnetic core 36 externally fitted to the cable is housed and attached to the cable.

Next, the locking portion 40 is formed with a band insertion hole 41 through which the band portion 10 is inserted. Inside the band insertion hole 41, its tip portion engages with the ratchet 11 of the band portion 10. A mating engagement piece 42 (see FIG. 3) is provided so as to project, and an operation piece 43 for displacing the engagement piece 42 extends from the engagement piece 42 toward the outside of the band insertion hole 41. Has been done.

In the locking portion 40 thus constructed, when the operation piece 43 is not operated, the tip portion of the engagement piece 42 and the ratchet 11 of the band portion 10 inserted into the band insertion hole 41 are engaged. By combining, the movable part 3 becomes the base part 1.
Fixed to. That is, the fixed portion 20 and the core holding portion 30 are connected to each other with a certain distance therebetween via the band portion 10 and the locking portion 40.

On the other hand, the operating piece 43 is operated to move the engaging piece 42.
Is displaced, the tip portion of the engaging piece 42 and the ratchet 1
The engagement with 1 is released. Therefore, by changing the insertion amount of the band portion 10 into the band insertion hole 41 while operating the operation piece 43, the gap between the fixed portion 20 and the core holding portion 30 can be appropriately adjusted.

The noise current absorber of the present embodiment thus constructed has a mounting hole formed near a power source socket S provided in a casing K of a personal computer or the like, as shown in FIG. 4, for example. Used by attaching to (not shown). That is, the press-fitting portion 21 of the fixed portion 20 is press-fitted into the mounting hole of the housing K to mount the base portion 1 on the housing K and the cable C having the plug P that is paired with the socket S.
The magnetic core 36 is externally fitted to the cable by attaching the core holding part 30 to the band K through the band insertion hole 41 of the locking part 40 provided integrally with the core holding part 30 and attached to the housing K. The base part 1 and the movable part 3 are integrated by inserting the band part 10 of the base part 1.

Then, the operation piece 43 is operated to move the movable portion 3.
By sliding on the band portion 10, the distance between the fixed portion 20 and the core holding portion 30, that is, the attachment position of the magnetic core 36 is adjusted so that the distance is most effective for absorbing noise current. Here, the core holding portion 30 (magnetic core 36) is attached near the boundary with the boot B formed at the base of the plug P.

However, the core holding portion 30 and the magnetic core 36
The diameter of the cable insertion hole formed by is larger than the outer diameter of the cable C and smaller than the outer diameter of the boot B. As described above, in the noise current absorber of the present embodiment, the fixing portion 20 that fixes the base portion 1 to the housing K, and the core holding portion 30 that holds the magnetic core 36 that is externally fitted to the cable C. By operating the operation piece 43, the interval can be arbitrarily set within the range of the length of the band portion 10.

Therefore, according to the noise current absorber of this embodiment, the adjustment of the mounting position of the magnetic core 36 is performed by the cable C.
This can be easily performed without attaching or detaching the core holding portion 30 to or from the. In addition, in the present embodiment, the movable portion 3 including the core holding portion 30 is fixed to the housing K via the base portion 1, so that the core holding portion is held as long as the connection between the plug P and the socket S is maintained. Magnetic core 3 held by the portion 30
The mounting position of 6 does not move. Therefore, the noise current can be favorably absorbed by the magnetic core 36 that is initially held at the adjusted mounting position.

Further, according to the present embodiment, even if the force for separating the plug P from the socket S is applied to the cable C, the boot B contacts the core holding portion 30 to prevent the plug P from moving. Therefore, it is possible to prevent the plug P from being accidentally dropped from the socket S.

Furthermore, in the present embodiment, the fixing portion 2
No. 0 requires only a rectangular mounting hole to be formed in the housing K, and
Can be fixed, and when not in use, press-fit part 2
By elastically deforming 1, it can be removed from the mounting hole. Therefore, the base 1 can be used in various parts with almost no modification of the structure or appearance of the object to be mounted, and the modification cost associated with the use of the noise current absorber and the appearance of the device can be improved. Can be minimized. [Second Embodiment] Next, a second embodiment will be described.

Since the noise current absorber of this embodiment is different from that of the first embodiment only in the configuration of the fixing portion 20, the same components are designated by the same reference numerals and the description thereof will be omitted. The description will focus on the different parts of the configuration. That is,
In the present embodiment, as shown in FIG. 5, the fixing portion 20 includes a fitting flange portion 23 formed at one end of the band portion 10,
A flat plate portion 24a and a flat plate portion 24 that are configured separately from the band portion 10 and are attached to the surface of an attachment target (housing or the like).
and a sticking plate 24 provided with a fitting portion 24b protruding from a and fittingly fitting the fitting flange portion 23. An opening window 24c exposing the socket S is formed in the flat plate portion 24a so that the plug P can be attached.

In the noise current absorber of this embodiment having such a configuration, first, the adhesive plate 24 is placed in a state where the socket S provided on the object to be attached is positioned so as to be exposed at the position of the opening window 24c. Secure to the object to be mounted with double-sided tape or adhesive. Then, the band portion 10 is integrally used by fitting the fitting flange portion 23 into the fitting portion 24b of the sticking plate 24 fixed to the attachment target.

With the noise current absorber of the present embodiment having such a configuration, even when the attachment hole cannot be formed in the attachment target, the noise current absorber can be attached to the attachment target portion. Therefore, the same operation and effect as in the case of the first embodiment can be obtained.

The flat plate portion 24a which constitutes the adhesive plate 24
As for the shape of the opening window 24, as shown in FIG.
c may be omitted. Further, as shown in FIG. 6 (B), the adhesive plate 25 may be integrated with the band portion 10. Further, the method of fixing the sticking plate 24 to the attachment target is not limited to the double-sided tape or the adhesive, but may be screwing. [Third Embodiment] Next, a third embodiment will be described.

Since the noise current absorber of this embodiment is different from that of the first embodiment only in the configuration of the fixed portion 20, the same components are designated by the same reference numerals and their description is omitted. The description will focus on the different parts of the configuration. That is,
In this embodiment, as shown in FIG. 7 (A), the fixing portion 20 is composed of a thin plate-shaped collar portion 27 formed at one end of the band portion 10, and the collar portion 27 has a screw hole 27a. Has been done.

The noise current absorber of this embodiment having the above-described structure has a collar portion 2 as shown in FIG. 7B, for example.
By inserting a screw for fixing the outlet cover V on the wall surface into the screw hole 27a formed in 7, it can be fixed on the surface of the outlet cover V for use.

Further, as shown in FIG. 7B, an insertion hole H for inserting the band portion 10 is formed in the outlet cover V so that the flange portion 27 is arranged between the outlet cover V and the wall surface. You may fix it. The collar 27 is
The screw hole 27a may be used to fix the portion other than the outlet cover V. Further, the screw hole 27a may be omitted, and the collar portion 27 may be fixed with a double-sided tape or an adhesive. [Fourth Embodiment] Next, a fourth embodiment will be described.

Since the noise current absorber of this embodiment is different from that of the first embodiment only in the configuration of the fixing portion 20, the same components are designated by the same reference numerals and description thereof will be omitted. The description will focus on the different parts of the configuration. That is,
In the present embodiment, as shown in FIG. 8, the fixing portion 20 includes a locking portion 28 formed by bending one end of the band portion 10 into an L shape on the back surface side, and a casing having an outlet cover V or an outlet. And a pair of ridges 29 formed in a shape (here, L-shaped in cross section) that is provided so as to project on the wall surface of the locking portion 28 and surrounds both edges of the locking portion 28. A check piece is formed at the tip of the locking portion 28.

The noise current absorber of this embodiment having the above-described structure is fixed to the outlet cover V or the housing by slidingly inserting the locking portion 28 between the pair of protrusions 29. It As described above, by using the pair of protrusions 29 as the structure for fitting the locking portion 28, not only is it easy to attach / detach to / from the outlet cover V or the housing, but also when the locking portion 28 is removed. It is possible to minimize the amount of protrusion from the outlet cover V and the housing.

The ridge 29 may be formed on the adhesive plate 24 described in the second embodiment instead of the fitting portion 24b. [Fifth Embodiment] The fifth embodiment will be described below.

As shown in FIG. 9, the noise current absorber of this embodiment is constructed in exactly the same manner as that of the first embodiment, except that the fixing portion 20 is composed of a clamp 26 for holding a cable. . According to the noise current absorber of the present embodiment configured as described above, the base portion 1 can be fixed to an arbitrary position of the cable, and the band portion 10 can be fixed from the fixed position.
The attachment position of the magnetic core 36 can be easily adjusted within the range of the length.

The clamp 26 may have any shape as long as it can be securely fixed to the cable. [Other Embodiments] Some embodiments of the present invention have been described above. However, the present invention is not limited to the above-mentioned embodiments, and can be implemented in various modes without departing from the scope of the present invention. It can be carried out.

For example, in the above embodiment, the ratchet 11 is formed on the back surface of the band portion 10, but it may be formed on both end surfaces in the width direction of the band portion 10 as shown in FIG. 10, for example. In this case, the locking portion 40 swings about the fulcrum 44 by elastic deformation of the fulcrum 44, and has a claw 46 that engages with the ratchet 11 at the tip thereof, so-called seesaw type. Lever 45
Can be used so as to be sandwiched from both sides of the band portion 10 in the width direction.

In the locking portion 40 thus constructed, the side opposite to the claw forming end of the lever 45 is used as the operating end, and the operating end is pressed by the fingers in the directions approaching each other, and It suffices to adjust the positional relationship with the band portion 10, release the pressing on the lever 45 at an appropriate position, and engage the pawl 46 with the ratchet 11. In addition, in FIG. 10, the illustration of the core holding unit 30 is omitted.

Further, as shown in FIG. 11, instead of providing the locking portion 40 with a mechanism for engaging with the ratchet 11, a protrusion 47 having a spherical tip is provided, and the band portion 1 is provided.
In 0, a fitting hole 12 into which the protrusion 47 is fitted may be formed instead of the ratchet 11. In this case, the band part 1
It is possible to fix the locking portion 40 (and thus the core holding portion 30) at an arbitrary position of the band portion 10 in a state where the 0 is once folded back. Further, in this case, since the movable portion 3 including the core holding portion 30 and the locking portion 40 is integrated with the band portion 10, the number of parts can be reduced, and the labor required for managing the parts can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a noise current absorber according to a first embodiment.

FIG. 2 is a perspective view showing the back surface of the band portion.

FIG. 3 is a front view of a movable part and a partial sectional view thereof.

FIG. 4 is an explanatory diagram showing a usage state of the noise current absorber.

FIG. 5 is a perspective view showing a configuration of a noise current absorber according to a second embodiment.

FIG. 6 is a perspective view showing a configuration of a modified example of the second embodiment.

FIG. 7 is a perspective view showing the configuration and usage of the noise current absorber of the third embodiment.

FIG. 8 is a perspective view showing the configuration and usage of the noise current absorber of the fourth embodiment.

FIG. 9 is a perspective view showing a configuration of a noise current absorber according to a fifth embodiment.

FIG. 10 is an explanatory diagram illustrating a configuration of another embodiment.

FIG. 11 is an explanatory diagram illustrating a configuration of another embodiment.

[Explanation of reference numerals] 1 ... Base part, 3 ... Movable part, 10 ... Band part, 11 ... Ratchet, 12 ... Fitting hole, 20 ... Fixing part, 21 ... Press-fitting part, 2
2 ... Leaf spring part, 23 ... Fitting flange part, 24 ... Adhesive plate, 24a
... flat plate part, 24b ... fitting part, 24c ... open window, 25 ... adhesive plate, 26 ... clamp, 27 ... collar part, 27a ... screw hole,
28 ... Locking part, 29 ... Ridge, 30 ... Core holding part, 31,
32 ... Case part, 33 ... Protrusion, 34 ... Hook, 35 ... Hinge, 36 ... Core holding part, 36 ... Magnetic core, 40 ... Locking part, 41 ... Band insertion hole, 42 ... Engaging piece, 43 ... Operation One piece, 44 ... Support point, 45 ... Lever, 46 ... Claw, 47 ... Protrusion, B ... Boot, C ... Cable, H ... Insertion hole, K ... Casing, P ... Plug, S ... Socket, V ... Outlet cover.

Claims (8)

[Claims] 1. A core holding portion that holds an annular magnetic core that is fitted onto a cable and is slidable with respect to the cable, and is fixed to the cable or an attachment object to which the cable is attached. A noise current absorber, comprising: a fixing part; and a connecting part that connects the core holding part and the fixing part and is capable of changing a distance between the two. 2. The magnetic core comprises a plurality of split pieces obtained by splitting the magnetic core in the axial direction, and the core holding part is configured to be detachable from a case part that houses each of the split pieces. The noise current absorber according to claim 1, further comprising: a fixing mechanism that fixes the case portion so that the divided pieces housed in the case portion are combined in an annular shape. 3. The fixing part has a shape that is press-fitted into a mounting hole formed in a wall surface of the mounting object and is mounted by elastic deformation of the fixing part. Item 2. A noise current absorber according to item 2. 4. The noise current absorber according to claim 1, wherein the fixing portion is an adhesive plate that is attached to a wall surface of the attachment target. 5. An outlet or a connector paired with a plug connected to the cable is formed on the attachment object, and an outlet or a connector formed on the attachment object is formed on the attachment plate. The noise current absorber according to claim 4, further comprising an opening for exposing the noise current absorber. 6. The noise current absorber according to claim 1, wherein the fixing portion is a clamp that holds the cable. 7. The connecting portion includes a band portion formed in an elongated shape, and a locking portion capable of locking at any position on the band portion or at a plurality of preset positions. 7. The noise according to any one of claims 1 to 6, wherein one of the core holding portion and the fixing portion is fixed to the band portion and the other is fixed to the locking portion. Current absorber. 8. The noise current absorber according to claim 1, wherein at least one of the core holding portion and the fixing portion and the connecting portion are configured to be detachable. Ingredient