JP3075555B2 - Noise absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise absorbing device for absorbing noise superimposed on a signal transmitted through a cable, and more particularly to forming a closed magnetic circuit with ferrite so as to surround a cable to absorb noise. Also, the present invention relates to a noise absorbing device capable of being fixedly supported on an electric device such as a chassis.

[0002]

2. Description of the Related Art In electronic equipment handling digital signals, such as a computer, if noise is superimposed on a signal transmitted through a cable and enters the equipment, the equipment may malfunction. For this reason, various noise absorbing devices have been proposed in recent years.For example, a pair of ferrites divided in the radial direction are brought into contact with each other by inserting a cable, and these ferrites surround the cable to form a closed magnetic circuit. There has been proposed a device that absorbs noise superimposed on a cable and prevents the noise from entering the device.

By the way, in order to enhance the noise absorbing effect of this type of noise absorbing device, it is preferable to fix the position in the length direction with respect to the cable at a predetermined position. That is, when this type of noise absorbing device is actually used, it is necessary to determine the position where the noise absorbing effect is most remarkable with respect to the cable by experiments, etc., and then fix the noise absorbing device at this cable position. It is said. For this reason, a configuration for fixing the noise absorbing device to the cable is conventionally provided.

For example, Japanese Unexamined Utility Model Publication No. 63-39997 discloses a method in which a projection is provided on an inner edge of a cable insertion opening provided in a cover for supporting a pair of ferrites, respectively. When the cover is closed and both ferrites are joined, the projections clamp or cut into the cable jacket to fix it. However, in this configuration, the projections are fixedly provided, so that when the diameter of the cable is small, the projections may not be in contact with the cable jacket or may not bite, and the diameter of the cable is large. If the jacket has high rigidity, the cover may not be able to be closed.

In order to deal with such a problem, a chassis or panel of an electronic device (these are referred to as a chassis or the like).
It is conceivable that the noise absorbing device is fixed to the chassis or the like for the cable extending along, and the cable is inserted through the noise absorbing device. For this reason, for example, it is conceivable that a belt insertion hole is provided in a part of the noise absorbing device, a belt for clamping is inserted into the belt inserting hole, and the noise absorbing device is fixed using the belt. Alternatively, it is conceivable to directly fix the noise absorbing device to the chassis or the like by using screws or the like.

[0006]

However, in this case, in order to fix the noise absorbing device to the chassis or the like, when the cable is installed on the chassis or the like, at the same time, the fixing operation by the belt fastening operation is performed. It is necessary and the fixing work is troublesome. In particular, it is extremely difficult to fix the noise absorbing device to a narrow place in the electronic device. In order to simplify the fixing work, it is conceivable to fix the noise absorbing device with a double-sided tape or the like. However, once the fixing is performed, the cable and the noise absorbing device are removed from the chassis or the like at the time of maintenance of the cable. It becomes difficult.

An object of the present invention is to provide a noise absorbing device which facilitates the work of fixing the noise absorbing device to a chassis or the like and the work of attaching and detaching the same.

[0008]

A noise absorbing device according to the present invention comprises a noise absorbing member and a fixed base, and the noise absorbing member includes a pair of noise absorbing members which are opposed to each other so as to sandwich the cable therebetween. It is composed of ferrite and a pair of covers that cover these ferrites, and the fixing base is fixed to a chassis or the like on which the cable extends, and is fitted to the noise absorber and the noise absorber is fixed to the chassis or the like. Is done.
Here, the cover of the noise absorber has a cylindrical shape, the both end faces thereof projecting fitting protrusion, the pair of the fitting pieces on the fixed base to be fitted into the fitting projection of the cover is It is assumed to be a standing structure. Further, the fitting piece is configured to be elastically deformable in the thickness direction, and to be fitted to the fitting projection of the noise absorbing tool by its elastic force .

Alternatively, according to the present invention, the cover of the noise absorbing device is formed in a cylindrical shape, and a fitting groove oriented substantially in the radial direction and a fitting projection projected in the cylinder axis direction are formed on one end surface thereof. The fitting table is formed integrally, and a fitting piece fitted in the fitting groove and a fitting piece having a fitting hole in which the fitting projection is fitted are provided upright on the fixed base. In this case, a notch is provided on one cover of the noise absorbing device, a band supporting arm is provided between the notch and the other cover, and a fastening band is inserted through the band supporting arm. It is preferable to adopt a configuration in which a cable through which the noise absorber is inserted is integrally fastened to the noise absorber.

[0010] In the present invention, the cover of the noise absorber has a cylindrical shape, and its one end surface is formed thick portion, wherein a thickness with in this thick portion fitting groove is formed
Wing pieces are formed along both sides of the meat portion, and the fixing base has a fitting groove into which the wing piece is fitted, and a locking piece having an engaging projection engaged with one edge of the fitting groove. And an upright wall having the following configuration . In this case, there is provided a band supporting arm partially having a locking projection fitted into the fitting groove, and the cable through which the noise absorbing tool is inserted is absorbed by a fastening band through which the band supporting arm is inserted. It is preferable to fasten integrally with the tool. Further, in the present invention, it is preferable that the fixing tool is provided with a clip, and is fitted into a hole provided in a chassis or the like to fix the fixing tool to the chassis or the like. In this case, for example, a configuration is adopted in which the clip is formed in a U-shape that can be elastically deformed, and when the clip is fitted into a hole of a chassis or the like, its tip is fitted in an elastic contact state with the inner edge of the hole. .

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially exploded perspective view of a first embodiment of a noise absorbing device 100 constituting a noise absorbing device of the present invention, FIGS. 2A to 2C are plan views thereof, and AA.
3 is a perspective view of an assembled state. In these figures, reference numerals 1A and 1B denote a pair of ferrites formed in a semi-cylindrical shape having a small axial dimension, and reference numerals 2A and 2B denote corresponding semi-cylindrical containers for internally supporting these ferrites. Cover. The ferrites 1A and 1B form a closed magnetic circuit by sandwiching a cable that absorbs noise between the ferrites 1A and 1B so that the flat surfaces 11 at the diametrical positions are opposed to each other to form a closed magnetic path, and are superimposed on signals transmitted through the cables. Noise can be absorbed and removed. Since the noise absorbing operation is already widely known, the description thereof is omitted here. Each ferrite 1
Since A and 1B are internally supported by the cover, support projections 12 projecting in the cylinder axis direction are formed at both ends in the cylinder axis direction at positions along the circumferential surface. In addition,
The support projection 12 has a tapered circumferential surface so that it can be easily mounted and fixed to the covers 2A and 2B as described later.

On the other hand, the covers 2A and 2B are formed of resin in a state where they are integrally connected by a pair of connecting pieces 21 on one side thereof.
The two covers 2A and 2B can be opened and closed due to the flexibility in 1. When closed, the covers form a short cylindrical container, and the semicircular inner edges 22 of the covers cover both end surfaces of the cylindrical container. Opening 23 (see FIG. 4)
Is formed. In the cover, an arrow-shaped engaging projection 24 protrudes in the tangential direction of the cylindrical surface on the other side of the cover 2A, and the engaging projection 24 on the other side of the other cover 2B. A pair of engagement holes 25 into which the protrusions 24 are inserted and engaged are formed.

Further, on the inner surfaces of both ends of each of the covers 2A and 2B in the cylinder axis direction, a part of the region from the peripheral surface side toward the center is formed to be somewhat thick, and the thick portion is formed. A fixing groove 26 is formed from the outside toward the center, and a radial step 26a is formed by the fixing groove 26. The fixing portions 12 provided on both end surfaces of the ferrites 1A and 1B can be fitted to the step portions 26a. In addition, a spring frame 27 formed in a rectangular rib shape along the peripheral edge is provided on the inner surface of one cover 2A in this case, and the spring frame 27 is shown in FIG. Thus, the wire spring 3 bent and formed in a rectangular shape is configured to be housed therein.

Furthermore, fittings projecting in the cylinder axis direction are formed on both ends of the respective covers 2A and 2B in the cylinder axis direction so as to be part of the circumference when the cylindrical container is constituted by both covers. A mating projection 28 is formed. The end surfaces of these fitting projections 28 are tapered surfaces whose thickness gradually decreases from the center side toward the outer diameter direction, and are formed in a wedge shape as a whole.

In this configuration, as shown in FIGS. 2 and 3, the ferrites 1A and 1B are connected to the covers 2A and 2B, respectively.
Inside B. In this case, the ferrites 1A and 1B are simply covered with the cylindrical surface facing the cover.
A and 2B may be pushed. As a result, the support projections 12 provided on the ferrites 1A and 1B, respectively, climb over the step 26a of the support groove 26 due to their tapered surface shapes, and engage with the step 26a when the step goes over.
As a result, the ferrite covers the cover 2 due to the engagement between the supporting projections 12 and the step portions 26a at both ends in the cylinder axis direction.
The ferrites 1A, 1B are supported inside the A, 2B to prevent the ferrites 1A, 1B from falling off the covers 2A, 2B. When supporting the ferrite, one of the covers 2
In A, the spring 3 is placed in the spring frame 27 inside the cover 2A before pushing the ferrite. The position of the spring 3 is regulated on both sides by a spring frame 27. In this state, since the spring 3 is in a flat state, the middle side thereof is in a state of floating from the inner surface of the cover 2A which is a cylindrical surface. Then, the ferrite 1A is pressed into the cover 2A from above the spring 3 and fixed, whereby the spring 3 is flexed in the outer diameter direction, and the elastic force as a reaction force causes the ferrite 1A to be bent.
A is urged in the direction of the flat surface 11.

Therefore, as shown partially in FIG. 4, the two covers 2A, 2B are bent at the connecting piece 21 with the cable 5 inserted through the respective cylindrical inner surfaces of the ferrites 1A, 1B.
B, the two covers 2A and 2B are integrated in a facing state by the engagement of the engagement projection 24 and the engagement hole 25, thereby forming the cylindrical container described above, and the cable 5 is connected to the opening 23 thereof. It is inserted inside. In this state, the ferrite 1A in one cover 2A is pressed against the other ferrite 1B by the urging force of the spring 3, and the flat surfaces 11 of both ferrites come into close contact with each other. Thus, a closed magnetic circuit surrounding the cable 5 is formed by the two ferrites 1A and 1B, and the noise on the cable is absorbed.

Further, in the present invention, a fixing base 200 for fixing and supporting the above-described noise absorbing device 100 is provided. FIG. 4 is a perspective view of the external appearance, and FIGS.
As shown in a plan view, a CC line sectional view, and a DD line sectional view of FIG.
Has a rectangular plate-like base portion 6 having a dimension slightly longer than the length in the cylinder axis direction. The noise absorber 10 is placed on the base portion 6 with the cylinder axis oriented in the short side direction. To support. A screw insertion hole 61 for fixing the base portion to a chassis or the like with screws is formed in a part of the base portion 6.
A pair of rails 62 extend in the short side direction on the base 6 so as to face in the long side direction, and a part of the circumference of the noise absorbing device 100 described later is provided on these rails 62. It is supported. Between the rails 62 of the base portion 6, elastic pieces 63 of one end support structure having one end fixed to the base portion 6 and the other end slightly inclined upward are provided so as to face each other. ing.

Further, the base portion 6 is fitted at substantially the center of both long sides with a width slightly larger than the width of the fitting projection 28 of the noise absorbing device 100 and opposed to each other. Pieces 64 are provided upright, and a fitting step 65 protruding inward is provided at the upper end of the fitting pieces 64. In the fitting step 65, a notch groove 66 having a size substantially equal to the width of the fitting projection is formed in a central region excluding both ends. It should be noted that a tapered recess 67 for reducing the thickness is formed directly above the fitting step 65. A groove 68 that penetrates the base portion 6 is formed directly below the fitting step 65, and the groove 68 is formed when the fitting step 65 is removed from the mold at the time of resin molding. .

Then, the base portion 6 of the fixing base 200 is fixed in advance to a location such as a chassis where the cable is to be provided by screws. At this time, the fixing base 200 is fixed in a direction in which the long side of the base portion 6 is along the extending direction of the cable.
FIG. 6 is a perspective view, and FIGS. 7A to 7C are plan views, EE line cross-sectional views, and FF line cross-sectional views. As shown in FIG. The tool 100 is fitted to the fixing base 200, and as a result, the noise absorbing tool 100 is fixed to a chassis or the like. In this fixing, the fitting projection 28 of the noise absorbing device 100 is inserted between the fitting pieces 64 of the fixing base 200. As a result, the fitting projection 28 goes over the fitting step 65 while elastically deforming the fitting step 65 outward, and is fitted into the notch groove 66. At this time, the fitting step 65
Is formed thin by the notch groove 66 and the tapered recess 67, so that the elastic deformation toward the outside is easy.

In the fitted state, since the cylindrical surface of the noise absorbing member 100 elastically deforms the elastic piece 63 downward, the noise absorbing member 100 is urged upward by the elastic restoring force. The biasing force prevents the fitting projection 28 from being disengaged from the fitting step 65. In addition, since the fitting step portion 28 is in contact with each end surface of the noise absorbing device 100 at its distal end surface, the noise absorbing device 100 is prevented from being moved in the cylinder axis direction by this abutting relationship. Fitting protrusion 28 and fitting step 65
Is maintained in the axial direction. Furthermore, since the noise absorbing member 100 has a cylindrical surface supported between the pair of rails 62, and the fitting pieces 64 are left at both ends of the notch groove 66 as relative projections, the fitting protrusion 28 is cut off. Since the noise absorbing member 100 is sandwiched by the notch groove 66 in a direction parallel to the radial direction of the noise absorbing member 100, the noise absorbing member 100 moves in the cylindrical direction, and the fitting protrusion 28 may come off the fitting step part 65. Is prevented.

In this configuration, if only the fixing base 200 is fixed to the chassis or the like in advance, when the cable 5 is arranged on the chassis or the like, the cable is inserted through the noise absorbing member 100, and Fix the noise absorber 100 to the fixed base 2
If it is fixed to 00, the noise absorber 100 can be fixed to the chassis or the like with one touch, so that the fixing operation can be performed extremely easily.

Note that the noise absorbing device 100 is
When the noise absorber 100 is disengaged from the fixing base 200 while being twisted, for example, the fitting piece 64 is also integrally twisted, and the fitting protrusion 28 and the fitting step 65 are fitted together. The combination is released, and the noise absorber 100 can be removed from the fixed base 200.

FIG. 8 is a partially exploded perspective view of a second embodiment of the present invention, which comprises a noise absorbing member 101 and a fixed base 201. In the following description, portions equivalent to those in the first embodiment are denoted by the same reference numerals. As in the first embodiment, the noise absorbing member 101 has semi-cylindrical container-shaped covers 2A and 2B connected by connecting pieces 21 and ferrites 1A and 1B in the covers 2A and 2B, respectively. It is decorated. Then, when the cylindrical projection is formed by the engagement between the engagement projection 24 provided on the cover 2A and the engagement hole 25 provided on the cover 2B, the elastic force of the wire spring 3 contained therein is used. The ferrites 1A and 1B are close to each other to form a closed magnetic path, and absorb the noise of the cable inserted through the center hole, as in the previous embodiment.

On the other hand, in the second embodiment, a pair of thick portions 41 are integrally formed at one end surface of the cover 2A at predetermined intervals in a tangential direction.
Are provided with fitting grooves 42 which open in directions parallel to each other toward the outer peripheral direction which is the downward direction in the figure.
Similarly, a rectangular and wedge-shaped fitting protrusion 43 protruding in the axial direction is formed between the thick portions 41 on one end surface of the cover 2A. And these fitting grooves 42
And the fitting projection 43, as will be described later,
, And is configured to be supported by the fixed base 201. Further, a rectangular notch 44 is formed at one side edge of a straight line extending in the radial direction of the inner edge at one end side of the cover 2A, and a cable is formed in the notch 44 as described later. A band support arm 8 for inserting and supporting a fastening band for fastening is fitted and supported.

That is, the fixed base 201 is provided with the first
As in the case of the first embodiment, a rectangular plate-shaped base portion 7 is provided, and is fixed to a chassis or the like (not shown) by a screw insertion hole 71 provided in a part thereof. A pair of support wall portions 72 having a length substantially equal to the axial length of the covers 2A and 2B are integrally formed on both sides of the upper surface of the base portion 7 in a state where they face each other. When the base 101 is placed along the length direction of the support wall portion 72, the outer peripheral surfaces of the covers 2A and 2B are supported by the support wall portion 72, respectively, and are stably supported on the base portion 7. It is configured to be able to. Also, the bearing wall 72
In the region sandwiched between the elastic support pieces 73, an elastic bearing piece 73 is formed integrally with its tip end slightly upward. Further, the cover 2 is located at a position near one end of the upper surface of the base portion 7.
A pair of fitting pieces 74 that can be fitted into the fitting grooves 42 provided in A are set up vertically. Furthermore, these fitting pieces 7
4, a fitting piece 75 having a rectangular fitting hole 76 into which the fitting projection 43 provided on the cover 2A can be fitted is provided upright.

The band support arm 8 has a base end 81 formed in a U-shape having a downwardly-facing U-shape along the length direction. Can be fitted into the notch portion 44 of FIG. Further, a rectangular band insertion portion 82 is integrally formed at the distal end portion of the band support arm 8, and the band insertion portion 82 has an elongated flat band insertion hole 83 penetrating in the vertical direction as shown in the figure.
Is open.

In the noise absorbing tool 201 including the covers 2A and 2B configured as described above, before assembling the covers 2A and 2B, the base end 81 of the band supporting arm 8 is formed in the cutout 44.
Is inserted. Then, as shown in the first embodiment, the wire spring 3 and the ferrites 1A, 1B are provided therein, and as shown in FIG. 9, the engaging projections 24 of the covers 2A, 2B and the engaging holes 2 are provided.
And 5 are formed into a cylindrical shape. As a result, the band supporting arm 8 has the base end portion 81 sandwiched between the opposing inner edges of the covers 2A and 2B, whereby the noise absorber 1
01 will be integrated.

Then, the noise absorber 101 is fixed to the fixing base 2.
01 from above, the noise absorber 10
One cylindrical outer peripheral surface is supported by a pair of bearing wall portions 72 in a state stabilized in the circumferential direction. FIG. 10 (a),
(B) is a front view and a GG line sectional view in that state. In this support state, the pair of fitting pieces 74 of the fixing base 201 are fitted into the pair of fitting grooves 42 provided in the noise absorbing tool 101, respectively, and the fitting protrusions provided in the noise absorbing tool 101 are provided. The part 43 is fitted into the fitting hole 76 by utilizing the elastic deformation of the fitting piece 75. Therefore, in this state, each fitting piece 74 has a certain width dimension,
In addition, since the noise absorbing member 101 is fitted in the fitting groove 42 in a close contact state in the thickness direction thereof, the noise absorbing member 101 is prevented from moving in the axial direction or the circumferential direction. Positioning becomes possible. Further, the fitting between the fitting protrusion 43 and the fitting hole 76 allows the noise absorbing device 10
1 is also prevented from moving above the fixed base 201.
At this time, since the elastic bearing piece 73 of the fixed base 201 is elastically deformed downward by the circumferential surface of the noise absorbing tool 101, an upward force is applied to the noise absorbing tool 101 by the repulsive force, and the fitting is performed by this force. The projection 43 is strongly pressed against the upper surface of the fitting hole 76, and the fitting projection 43 is prevented from coming off the fitting hole 76. Thereby, the vertical play between the noise absorbing tool 101 and the fixed base 201 is absorbed, and the noise absorbing tool 101 is stably and firmly fixed and supported.

Then, as shown in FIG. 11, a known band 9 for fastening is wrapped around the cable 5 inserted through the opening 23 of the noise absorbing tool 101, and a part of the band 9 is Through the band insertion hole 83. Then, by fastening the band 9, the cable 5 is fastened to the band supporting arm 8 by the band 9, and as a result, the cable 5 is integrated with the noise absorber 101. By fastening the band, it is possible to prevent the cable 5 from being moved in the length direction within the opening 23 of the noise absorbing tool 101, and to stabilize the cable 5 with respect to the chassis or the like via the fixing base 201. Can be arranged and supported.

In the second embodiment, when removing the noise absorbing tool 101 from the fixed base 201,
When the fitting piece 75 is elastically deformed outward and the fitting projection 43 and the fitting hole 76 are disengaged, the noise absorbing tool 101 can be lifted vertically upward, and as a result, the fitting groove 4 can be lifted.
2 is detached from the fitting piece 74 and can be removed. When the cable 5 is temporarily removed from the noise absorbing tool 101, the band supporting arm 8 can be covered with the covers 2A and 2B without releasing the fastening by cutting the fastening band.
It is also possible to release the band supporting arm 8 from the noise absorbing tool 101 by releasing the pinched state. Also, by releasing the fitting of the covers 2A and 2B while the noise absorbing member 101 is fixed to the fixing base 201, it is possible to detach only the cable 5 from the noise absorbing member 101.

FIG. 12 is a partially exploded perspective view of the third embodiment of the present invention. The internal structure of the noise absorber 102 is the same as in each of the above embodiments. In addition, the noise absorber 10
As in the second embodiment, a fixing base 202 is provided to fixedly support the 2 on a chassis or the like, and a band supporting arm 8A of a fastening band for fastening a cable is provided. Here, in this embodiment, a thick portion 11 having left and right wing pieces 112 protruding left and right in a tangential direction is formed on a part of the circumference of one end face of the cover 2A of the noise absorber.
1 are formed integrally, and a fitting groove 113 penetrating in the radial direction is formed at a central position of the thick portion 111. The upper edge of the fitting groove 113 has a rectangular recess 11.
A rib 11 extending in the horizontal direction is formed on the inner surface of the fitting groove 113 immediately below the concave portion 114.
5 are integrally formed so as to protrude.

On the other hand, the fixing base 202 is formed by a base portion 7A made of an L-shaped plate-like small piece, and the flat plate portion is provided with a screw insertion hole 71 for fixing to a chassis or the like. The upright wall portion is formed to be thick, and the wing piece 11 of the thick portion 111 of the noise absorber 102 is provided here.
2 is formed in a state in which a fitting groove 77 in which the fitting 2 can be inserted penetrates in the vertical direction. Here, the vertical wall portion is formed with a pair of slits arranged in the width direction of the fitting groove 77 so that a central portion in the width direction is formed as a cantilever locking piece 78. A wedge-shaped locking projection 79 is formed on the upper edge portion toward the inner surface.

The band supporting arm 8A is formed of a plate member having a T-shaped planar shape, and a wedge-shaped engaging projection 85 is formed on the lower surface of the base end portion 86 having a large width.
Is formed so as to protrude vertically downward, and the fitting piece 84 can be fitted into the fitting groove 113 of the noise absorbing tool 102. Further, the distal end portion 87 of the band support arm 8A is formed to be slightly thick, and a band insertion hole 88 penetrating in the horizontal direction is opened here.

In this configuration, the noise absorber 102
Cover 2A, 2B is closed and ferrite 1A, 1
B is the same as in the previous embodiments in that the cable 5 is inserted into the opening 23 with the interior B. The same applies to fixing the fixing base 202 to a chassis or the like using the screw insertion holes 71. Then, as shown in the perspective view and the vertical sectional view of the center position in FIG. 13 and FIG.
02 so as to be fitted into the fitting groove 77 of the noise absorber 10.
2 is placed on the fixed base 202. At this time, the fixed table 20
2 is elastically deformed so that the locking projection 79 engages with the concave portion 114 provided on the upper edge of the thick portion 111.
Is prevented from being detached from the fitting groove 77, and as a result, the noise absorber 102 is prevented from being detached from the fixed base 202.

Then, the fitting piece 84 at the base end of the band supporting arm 8A is fitted into the fitting groove 113 of the thick part 111 of the noise absorbing tool 102. By this fitting, the locking projection 85 at the tip of the fitting piece 84 is locked to the rib 115 of the fitting groove 113, and the locking force prevents the band supporting arm 8A from being detached from the noise absorber 102. After that,
As shown in the front view and the left side view in FIGS. 15A and 15B, the fastening band 9 is inserted into the band insertion hole 88 of the band support arm 8A, and the cable 5 inserted into the noise absorbing member 102 is inserted. By performing the fastening, the band supporting arm 8A and the cable 5 can be integrally fastened, and the cable 5 can be fixedly supported. In this case, the noise absorber 10
It goes without saying that the band supporting arm 8A may be fitted into the second unit 2 and integrated therewith.

In this embodiment, the locking piece 78 of the fixing base 202 is elastically deformed outward, so that the locking projection 79 is released from the locking state with the concave portion 114. Therefore, the wing 112 and the thick portion 111, That is, the noise absorber 102 is
02 can be removed. In addition, since the band supporting arm 8A only has the locking projection 85 of the fitting piece 84 locked to the rib 115 of the fitting groove 113, the band supporting arm 8A is released by strongly pulling the band supporting arm 8A. Can be removed from the noise absorber 102. In particular,
In the third embodiment, the band supporting arm 8A is more advantageous than the second embodiment in that the band supporting arm 8A can be attached and detached even when the covers 2A and 2B are closed.

FIG. 16 is a partially exploded perspective view showing a modification of the second embodiment shown in FIGS. Also,
FIG. 17 is a perspective view of the assembled state, and FIGS. 18 (a) and (b).
FIG. 18 is a sectional view taken along lines HH and II in FIG. 17. In this embodiment, a clip portion is provided on the fixed base 201A so that the fixed base 201A or the noise absorbing tool 101 can be performed on the chassis 300 with one touch. 9 shows a state in which the band support arm 8 according to the second embodiment is not provided. In the fixing base 201A, parts equivalent to those in the second embodiment are denoted by the same reference numerals, but here, instead of the screw insertion holes 71 of the second embodiment, , Clip pieces 7 each protruding toward the back side
01 is provided. These clip pieces 701 are formed in a substantially U-shape, one end of which is integrally connected to the base 7, and the other end of which is elastically deformable in the thickness direction. In addition, an engagement step portion 702 having a changed thickness is provided in a part thereof. A rectangular window 70 penetrated in the thickness direction of the base portion is provided in the base portion 7 between the clip pieces 701.
In the window 703, a pressing piece 704 having a one-end support structure with a front end protruding to the rear surface side is provided.

When the noise absorbing member 101 is fixedly supported on the fixing member 201A by using the fixing member 201A having this configuration, the operation of attaching the band supporting arm 8 to the noise absorbing member 101 in the second embodiment is performed. Can be performed in exactly the same manner as in the second embodiment, except that there is no. On the other hand, when the fixing base 201A is fixed to the chassis 300, the clip piece 2 is attached to the chassis 300 in advance.
In this case, a pair of minute rectangular holes 301 corresponding to “01” may be opened, and the clip pieces 701 may be fitted into these rectangular holes 301. As a result, each clip piece 701 is inserted into each rectangular hole 301 while being elastically deformed as shown in FIG. 19 (a) and its JJ line sectional view in FIG. 19 (b). The engaging step 702 at the other end is engaged with the edge of the rectangular hole 301 by elastic force, and the fixing base 201A is attached to the chassis 300 by this engaging force.
At this time, the distal end of the pressing piece 704 is resiliently contacted with the surface of the chassis 300, and the reaction force generates a force that presses the fixed base 201A upward, so that the engaging step 702 of each clip 701 and the engaging step 702 are rectangular. The engagement state with the edge of the hole 301 is maintained in a stable state, and the fixed base 201A is firmly attached to the chassis 300. When the fixing base 201 is detached from the chassis 300, the other end of the pair of clip pieces 701 protruding above the surface of the chassis 300 may be elastically deformed by pinching the other end of the clip piece 701 with a fingertip to narrow them. The engaging state between the joint portion 702 and the edge of the rectangular hole 301 can be released, and if the fixing base 201A is lifted up thereon, it can be removed.

As described above, in this embodiment, the fixed base 2 is fixed to the chassis 300 by the pair of clip pieces 701.
01A can be attached and detached with one touch.
Since the noise absorber 101 can be attached to and detached from 1A just as in the second embodiment with a single touch, the attachment and detachment of the noise absorber to various devices can be performed very easily. Note that the rectangular hole 301 is
The length of the clip piece 701 in the direction parallel to the cable 5 to be inserted into the noise absorbing device, that is, the length of the side opposite to the side not directly related to the engagement with the engagement step portion 702 of FIG.
The clip piece 701 and the rectangular hole 301 can be engaged with each other even if the width of the rectangular hole 301 is larger than the width of the fixing base 201A and the noise if the rectangular hole 301 is slightly extended in the direction along the cable 5. The mounting position of the absorbing member 101 can be adjusted along the cable 5, and in this respect, the mounting of the noise absorbing member is smaller than the configuration in which the fixing base is mounted on a chassis or the like by screws as in the above-described embodiments. This is effective when adjusting the wearing position.

In each of the first to third embodiments, the cover of the noise absorbing member is an example of a so-called toroidal ferrite having a short cylindrical shape. The present invention can be similarly applied to a noise absorbing device to be used. Also,
The fixing base may be fixed to a chassis or the like with double-sided tape. Further, in the second and third embodiments, a configuration in which no band supporting arm is provided as in the first embodiment may be adopted. Conversely, also in the first embodiment, it is possible to adopt the band support arm and its mounting structure as in the second embodiment.

[0041]

As described above, the noise absorbing device of the present invention can be applied to a noise absorbing device composed of a pair of ferrites and a pair of covers covering these ferrites, a chassis on which cables are extended, and the like. It is composed of a fixed base that is fixed and fitted to the noise absorbing device and fixes the noise absorbing device to the chassis etc.If the fixing base is fixed in advance to the required location such as the chassis, cables will be laid. At the same time, the noise absorber can be fixed simply by fitting the noise absorber to the fixed base. Therefore, the noise absorbing device can be fixed to the chassis or the like with one touch, and the fixing operation or the detaching operation can be performed extremely easily. Particularly, even in a narrow place in the electronic device, the noise absorbing device can be quickly and easily mounted. There is an effect that the arrangement can be performed. In the noise absorbing device of the present invention, the pair of covers
It is formed in a cylindrical shape, and both ends or one end of this cover
A fitting projection or a fitting groove is formed on the surface, and the fixing base has
A fitting piece or a fitting piece that fits into the fitting protrusion or the fitting groove is provided.
The cover is fixed
Can be fixed on the flat surface of the cover
A projection and a fitting groove are formed.
And fitting grooves are formed on the circumferential surface of the cover.
Bars can be easily formed.

According to the present invention, a band supporting arm which can be attached to and detached from the noise absorbing device is provided, and a cable for inserting the noise absorbing device is fastened by a fastening band for inserting the band supporting arm. Can be integrally supported by the noise absorber. Thus, when the noise absorber is fixed and supported by using the fixing base fixed to the chassis or the like, the cable can be fixed and supported to the chassis or the like, and the stable arrangement of the cable is also possible. Furthermore, by providing a clip on the fixed base, the fixed base can be fixed to the chassis or the like simply by fitting the clip into a hole provided in the chassis or the like, and the arrangement of the noise absorbing device described above can be performed more easily. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a noise absorbing device according to a first embodiment of the present invention.

FIG. 2 is a plan view, a sectional view taken along the line AA, and a sectional view taken along the line BB of the noise absorber.

FIG. 3 is a perspective view of the assembled state of FIG. 1;

FIG. 4 is a perspective view of a noise absorber and a fixing base.

FIG. 5 is a plan view, a CC line sectional view, and a DD line sectional view of the fixing base.

FIG. 6 is a perspective view of a state in which the noise absorbing device is fixed to a fixed base.

7 is a plan view, an EE line sectional view, and an FF line sectional view of FIG. 6;

FIG. 8 is a partially exploded perspective view of a second embodiment of the present invention.

FIG. 9 is a perspective view of the assembled state of FIG.

10 is a front view of the state of FIG. 9 and a sectional view taken along line GG.

FIG. 11 is a perspective view showing a state where the cable is fastened by the fastening band in FIG. 9;

FIG. 12 is a partially exploded perspective view of a third embodiment of the present invention.

FIG. 13 is a perspective view of the assembled state of FIG.

FIG. 14 is a longitudinal sectional view at the center position in the state of FIG. 13;

FIG. 15 is a front view and a left side view of a state in which the cable is fastened by the fastening band.

FIG. 16 is a partially exploded perspective view of a modification of the second embodiment of the present invention.

17 is a perspective view showing an assembled state of the noise absorbing device and the fixing base of FIG. 16;

18 is a sectional view taken along line HH and II in FIG.

19 is a perspective view of the assembled state of FIG. 16 and a sectional view taken along the line JJ thereof.

[Explanation of symbols]

 Reference Signs List 1A, 1B Ferrite 2A, 2B Cover 3 Spring 5 Cable 6 Base 7, 7A Base 8, 8A Band support arm 9 Fastening band 12 Supporting projection 21 Connecting piece 23 Opening 24 Support projection 25 Support hole 26 Support Groove 28 Fitting projection 42 Fitting groove 43 Fitting projection 44 Notch 64 Fitting piece 65 Fitting step 66 Notch groove 74 Fitting piece 76 Fitting hole 77 Fitting groove 78 Locking piece 79 Locking projection 83 , 88 Band insertion hole 112 Wing piece 113 Fitting groove 114 Depression 115 Rib 100, 101, 102 Noise absorber 200, 201, 201A, 202 Fixing table 300 Chassis 301 Rectangular hole 701 Clip piece

Continuation of the front page (56) References JP-A-9-22821 (JP, A) JP-A-9-7839 (JP, A) JP-A-9-22821 (JP, A) JP-A-9-270336 (JP) JP-A-5-47566 (JP, A) JP-A-4-5804 (JP, A) JP-A-4-330705 (JP, A) JP-A-7-240317 (JP, A) 4-363007 (JP, A) Japanese Utility Model 5-8996 (JP, U) Japanese Utility Model 6-62595 (JP, U) Japanese Utility Model 4-97317 (JP, U) Japanese Utility Model 3-13797 (JP, U) U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 9/00 H01F 17/06

Claims (7)

(57) [Claims] 1. A noise absorber comprising a pair of ferrites opposed to each other in close contact with each other so as to sandwich a cable, and a pair of covers covering the ferrites.
The cable is fixed to the chassis or the like that extends, the fitted noise absorber is configured noise absorber in a fixing base for fixing to the chassis or the like, mosquitoes of the noise absorbing member
The bar is formed in a cylindrical shape, and fitting projections protrude from both end surfaces.
The fixed base is provided in the cylinder axis direction of the noise absorber.
It can be elastically deformed, and the elastic force when elastically deformed
A pair of fittings that are fitted to fitting projections of the noise absorbing device.
A noise absorbing device characterized in that a joining piece is erected . 2. In close contact with each other so as to sandwich a cable.
A pair of ferrites that are
A noise absorber consisting of a pair of covers that cover the
The cable is fixed to a chassis or the like to be extended,
Fit the noise absorber to the chassis etc.
Consists of a fixed base which fixes the to cover the noise absorber has a cylindrical shape, a fitting groove which is directed substantially in the radial direction on its one end face, fitting protrusion that protrudes in the cylinder axis direction There are formed integrally respectively, and fitting pieces the the fixing base is fitted to the fitting groove, that the fitting piece having a fitting hole in which the fitting protrusion is fitted is provided upright Characteristic noise absorbing device. 3. A notch in one of the cover of the noise absorbing member is provided, the band supporting arm is provided to be sandwiched between the cutout portion and the other of the cover, is inserted through the band support arm The noise absorbing device according to claim 2 , wherein a cable through which the noise absorbing device is inserted by a fastening band is integrally fastened to the noise absorbing device. 4. In close contact with each other so as to sandwich the cable.
A pair of ferrites that are
A noise absorber consisting of a pair of covers that cover the
The cable is fixed to a chassis or the like to be extended,
Fit the noise absorber to the chassis etc.
It is composed of a fixing base for fixing to the cover of the noise absorber has a cylindrical shape, a thick portion is formed at one end surface, the thickness together with the fitting groove is formed in the thick portion
Wing pieces are formed along both sides of the meat portion, and the fixing base has a fitting groove into which the wing piece is fitted, and a locking piece having an engaging projection engaged with one edge of the fitting groove. noise absorbing apparatus characterized by vertical wall portion is provided with and. 5. A band supporting arm having a locking projection partially fitted in the fitting groove is provided, and a cable through which the noise absorbing tool is inserted is absorbed by a fastening band through which the band supporting arm is inserted. Claims that are integrally fastened to the tool
5. The noise absorbing device according to 4 . Wherein said fixture clip is provided, the noise absorbing apparatus according to any one of claims 1 to 5 is fitted into the hole provided in the chassis or the like for fixing the fixture to the chassis or the like. Wherein said clip is formed elastically deformable U-shape, according to claim 6, wherein the distal end when it is fitted into the holes in the chassis or the like is fitted to the elastic contact state with the inner edge of the hole <br/> A noise absorbing device.