JPH0922821A - Noise absorbing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deliver a noise absorbing device body and a pedestal in combination to a consumer in advance, improve the fitting operation property, for example, for a cable at the consumer side, and easily mount the noise absorbing device, for example, to an enclosure and a printed circuit board. SOLUTION: Ferrites 30A and 30B in a shape where annular bodies are split are housed in case parts 11A and 11B which are mutually and directly coupled by a hinge part 12, a noise absorbing device has a noise absorbing device body NF where the magnetic path of the ferrites 30A and 30B constitutes a closed loop while the case parts 11A and 11B are closed, and further a pedestal 10 is detachably mounted to a position which is different from the switching edge pcsition of the case parts 11A and 11B and which does not prevent the switching.

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 which is installed around a bundle of cables or electric wires and absorbs and removes noise propagating through the cables. The present invention relates to a noise absorbing device that can be mounted on and fixed in position.

[0002]

2. Description of the Related Art Conventionally, as a noise absorbing device mounted around a cable to absorb and eliminate noise propagating through the cable, a structure shown in Japanese Utility Model Publication No. 6-14449 is known. As shown in FIG. 10, this conventional noise absorbing device has holding case portions 1A and 1B which respectively house ferrites having a shape obtained by dividing a ring into two and which are connected to each other by a hinge portion 2, and the holding case portion 1A is provided. , 1B are opened and attached to the cable CA, and then the holding case portion 1A,
The pedestal 4 is used by fitting the locking protrusions 3 of the holding case portions 1A and 1B provided on the opposite side of the hinge portion 2 (opening / closing end side of the case portion) with 1B closed.

[0003]

By the way, in the conventional noise absorbing device as shown in FIG. 10, the locking projections 3 are formed at the open / close end portions of the holding case portions 1A and 1B in which ferrite is housed, respectively. Since the pedestal 4 is fitted to the stopper projection 3 and the holding case portions 1A and 1B are securely locked in a closed state, the noise absorbing device main body (holding case portions 1A and 1B containing ferrite) and If the product is delivered to the user (user) in a state where the pedestal 4 and the pedestal 4 are fitted to each other, it is necessary to remove the pedestal from the noise absorbing device main body again when the user attaches the cable to the cable. The device main body and the pedestal had to be delivered separately as separate parts. For this reason, there is a concern that the work efficiency on the side of the customer is poor and the parts management is troublesome.

Further, a pedestal is attached to a housing of an electronic device or a printed circuit board with a screw, a double-sided adhesive tape or the like, and the noise absorbing device main body is fitted to the attached pedestal. The pedestal is the noise absorbing device. Since it also has the function of holding the main body in a closed state, there is a problem in workability of attachment and detachment. In particular, after the noise absorbing device body is once fitted to the pedestal already fixed to the housing or the printed circuit board, the work of removing the noise absorbing device body from the pedestal such as replacement of the substrate accompanying maintenance work is troublesome. That is, the noise absorbing device main body and the noise absorbing device main body are securely fitted so as not to fall off from the pedestal easily (for example, the latching claws that engage with the locking projections 3 of the holding case portions 1A and 1B are the pedestals. 4)), but when the pedestal is attached to the substrate, etc., the fitting part between the pedestal and the noise absorbing device body is close to the substrate. It is difficult to do it smoothly.

[0005] A first object of the present invention is to solve the above problems,
An object of the present invention is to provide a noise absorbing device which can be delivered to a customer in a state where a main body of the noise absorbing device and a pedestal are combined in advance, and which has good workability in mounting the cable on the consumer side.

A second object of the present invention is to provide a noise absorbing device which has a good workability for attaching and detaching a cable or the like.

A third object of the present invention is to provide a noise absorbing device which can be easily attached to a housing or a printed circuit board.

Other objects and novel features of the present invention will be clarified in the embodiments of the invention described later.

[0009]

In order to achieve the above-mentioned object, the present invention comprises a case body interconnected by a hinge section and a magnetic body having a shape obtained by dividing an annular body, respectively. In the noise absorbing device in which the magnetic path of the magnetic material forms a closed loop in a state where the portion is closed, a pedestal is attached at a position different from the open / close end of the case portion.

Further, a pedestal mounting fitting portion is formed on the case portion, and an elastic projection piece fitting on the pedestal mounting fitting portion is integrally formed on the pedestal, and the pedestal portion is mounted on the case portion. It may be configured to be detachably attached.

Further, an elastic projection portion may be formed on the upper surface of the pedestal so as to come into pressure contact with the bottom portion of the case portion.

Further, a locking fitting hole or a recess is integrally formed at an opening / closing end of one case part to which the pedestal is attached, and the other case part which is openable / closable with respect to the one case part is formed. The locking fitting convex portion that fits in the locking fitting hole portion or the concave portion may be integrally formed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a noise absorbing device according to the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention, showing the entire structure of a noise absorbing device, FIGS. 6 to 8 showing a noise absorbing device main body portion, and FIG. 9 showing a pedestal portion.

As shown in these drawings, the noise absorbing device is formed so that the ferrite (30A, 30B) as a magnetic body having a shape obtained by dividing a ring (annular body or cylindrical body) into two can be housed without rattling. Two case parts 11A, 1
1B, a plastic holding case 10, and ferrites 30A housed in the case parts 11A and 11B,
The noise absorber main body NF is composed of 30B, and the plastic pedestal 40 is detachably attached to the one case portion 11A.

The plastic holding case 10 of the main body NF of the noise absorbing device has two case portions 11A and 11B joined by a hinge portion 12 and has ferrite 30A and 30B formed by dividing the ring into two parts. It is formed so that it can be easily stored. That is, the case part 1
1A and 11B are substantially half-cylindrical shapes capable of covering the outer peripheral surfaces and both end surfaces of the ferrites 30A and 30B.
As shown in the plan view and the bottom view of FIG.
Elastic tongue portion 13 slightly bent in the direction of pressing the outer peripheral surfaces of ferrites 30A and 30B on the outer peripheral portions of A and 11B.
Is integrally formed, and pressing claws 14 are integrally formed on the inner side surfaces of the case portions 11A and 11B so as to prevent the ferrites 30A and 30B from falling off from the case portions. In addition, semicircular notches 15 are formed on both side surfaces of the case portions 11A and 11B so as to correspond to the side shapes of the ferrites 30A and 30B.

Further, an extension portion 16 is integrally formed at the opening / closing end portion (end portion on the opposite side of the hinge portion 12) of the case portion 11A, and the extension portion 16 is locked to the extension portion 16 as shown in FIG. A fitting hole 17 is formed. An extension locking piece 18 is integrally formed at the open / close end of the case portion 11B, and the front end of the case portion 11B serves as a locking fitting protrusion 19 that fits into the fitting hole 17. When the case portion 11B is rotated 180 degrees from the open state of the case portions 11A and 11B in FIGS. 1 and 5, the fitting protrusion 19 on the case portion 11B side is inside the fitting hole portion 17 on the case portion 11A side. And the case portions 11A and 11B are kept closed.

Flange-shaped projections 20A are integrally formed on the outer peripheral surface of the case portion 11A at positions near the front end surface and the rear end surface thereof, respectively, and the outer peripheral surface of the case portion 11B is also located near the front end surface and the rear end surface. Flange-shaped convex portions 20B are formed at positions near the end faces. As shown in the bottom view of FIG. 7, the outer peripheral surface positions along the outer surfaces of the pair of flange-shaped convex portions 20A (front side of the front flange-shaped convex portion and rear side of the rear flange-shaped convex portion) are respectively provided at two locations (total 4). Location) Vent hole 2
1A is formed. In addition, the pair of flange-shaped protrusions 2
On the outer surface of 0A, two pedestal mounting fitting recesses 22 (four in total) for detachably mounting the plastic pedestal 40 are formed at positions facing the respective holes 21A. In addition, as shown in the plan view of FIG.
The outer peripheral surface positions along the outer surfaces of the pair of flange-shaped convex portions 20B (front side of the front flange-shaped convex portion and rear side of the rear flange-shaped convex portion) at two locations (four locations in total), respectively, and punched holes 21B
Are formed. However, since the pedestal 40 is not attached to the upper case portion 11B, the pedestal mounting fitting recess 22
Is not formed.

A projecting portion 25 is integrally formed on one outer side surface of the case portion 11A, and a binding band insertion hole 26 is provided in the projecting portion 25. This binding band insertion hole 26 is provided with ferrites 30A and 30B when the base is not used.
The holding case 10 in which the noise absorbing device main body NF is accommodated is passed through a binding band for stopping the cable to the cable.

Each of the ferrites 30A and 30B has a shape obtained by dividing a ring into two parts, but the portion contacting the pressing claw 14 on the plastic holding case 10 side has a step surface which is one step lower. The ferrites 30A and 30B are fitted and stored in the case portions 11A and 11B of the holding case 10 by utilizing the elasticity of the holding case 10, and the elastic tongue portion 13 and the pressing claw 14 which are slightly bent inside the case.
It is held without rattling, and the noise absorber main body NF is constituted by this.

The plastic pedestal 40 has a substantially rectangular pedestal body 41 having ribs 42 of a constant height formed on the periphery thereof.
Two pairs of elastic projection pieces 43 extending upward on both long sides of the rib 42, elastic pressing tongue pieces 45 extending obliquely downward from both side surfaces of the pedestal body 41, and below the center of the lower surface of the pedestal body 41. And a columnar body 46 for mounting which is extended to. The two pairs of elastic protrusions 43 are in a positional relationship capable of sandwiching the pair of flange-shaped protrusions 20A of the case portion 11A from the outside, and the locking claws 44 are provided at the tips of the elastic protrusions 43. The locking claws 44 of the pair of elastic protrusions 43 are opposed to each other. Further, an elastic protrusion 50 having a shape (arc shape) obtained by dividing a circular ring into a plurality is integrally formed in the central portion of the upper surface of the base body 41. These elastic protrusions 5
0 is pressed against the bottom of the case portion 11A,
This is to prevent rattling between A and the pedestal 40. The elastic pressing tongue portion 45 and the mounting cylinder 46 are
This is for allowing the pedestal 40 to be mounted on a housing, a printed circuit board, or the like without using screws or the like. As shown in FIG. 2, a detachment preventing claw 47 is formed at the lower end of the mounting columnar body 46, and Vertical slit groove 4 for elasticity
At 8, the lower part of the mounting cylinder 46 is divided into two parts.

As shown in FIG. 3, the plastic pedestal 40 is formed by removing the elastic protrusions 43 so that the front and rear flange-shaped protrusions 20A formed on the holding case 10 side case portion 11A are sandwiched. It is attached to the holding case 10 by inserting it into the holes 21A and fitting the locking claws 44 at the tips of the elastic protrusions 43 into the pedestal mounting fitting recesses 22 formed at the positions corresponding to the holes 21A. To be On the contrary, the locking claws 44 can be removed from the pedestal mounting fitting recesses 22 by utilizing the elasticity of each elastic protrusion 43, and the pedestal 40 can be attached to and detached from the holding case 10.

When the noise absorbing device main body NF is attached to the housing of the electronic device or the printed circuit board by using the pedestal 40,
The pedestal 40 is attached to the holding case 10 (or the pedestal 40 is integrated in advance with the holding case 10) from the disassembled state of FIGS. 1 and 5, and a cable CA indicated by a two-dot chain line
(Or a bundle of electric wires) is arranged in the semicircular concave portion of one case portion 11A and the ferrite 30A, and the other case portion 11B.
Is rotated 180 degrees and the fitting convex portion 19 is fitted inside the fitting hole portion 17 on the side of the case portion 11A as shown by the arrow in FIG. 8 to close both the case portions 11A and 11B as shown in FIG. And FIG.
As shown by the phantom line in FIG.
Is inserted into the fitting hole 61 of the housing (or printed circuit board) 60, the pull-out preventing claw 47 at the lower end portion of the mounting columnar body 46 is caught on the back side peripheral edge of the fitting hole 61, and the elastic pressing tongue portion is formed. Since 45 presses the upper surface of the housing 60, the pedestal 40, that is, the noise absorbing device can be attached to the housing 60 without rattling. Conversely, the holding case 10 and the pedestal 40
May be integrated, the pedestal 40 may be attached to the housing 60 first, and then the cable or the like may be arranged between the case portions 11A and 11B.

By mounting a noise absorbing device around the cable or the like, the noise propagating through the cable or the like is absorbed by the ferrites 30A and 30B whose magnetic paths are closed loops when the case portions 11A and 11B are closed. , Removed.

According to the embodiment of the present invention, the following effects can be obtained.

(1) The plastic holding case 10 is made of plastic at a position different from the opening / closing ends of the case parts 11A, 11B (a position in the middle of the outer peripheral surface of the case part 11A that does not hinder the opening / closing of the case parts 11A, 11B). With the structure in which the pedestal 40 is attached, the opening / closing surfaces of the case portions 11A and 11B are substantially parallel to the mounting surface to the housing or the like at the intermediate height position of the holding case 10, and whether or not the pedestal 40 is mounted to the holding case 10. The case parts 11A and 11B can be opened and closed. For this reason, the holding case 1 is previously requested to the consumer.
It is possible to package and deliver the pedestal 40 as an integrated product. Therefore, what was conventionally managed as two parts on the consumer side can be managed as one part, product management becomes easy, and moreover, the work of attaching to a bundle of cables or electric wires and the work of attaching to a housing or a printed circuit board can be performed efficiently. Can be implemented. Further, since the case portions 11A and 11B can be easily opened and closed after the pedestal 40 is attached to the housing, the printed circuit board or the like, it is easy to remove or replace the printed circuit board or the like during maintenance and inspection, and maintainability is improved. Is excellent. Further, since the noise absorbing device is not placed on the bundle of cables or electric wires by being positionally fixed to the housing or the like, stress on the connector or the like at the tip of the cable or the like can be avoided. Further, there is also an effect of bundling and guiding a plurality of signal cables inside the housing at predetermined positions.

(2) A pair of mounting recesses 22 for mounting the pedestal are formed on the front and rear flange-shaped projections 20A formed on the case portion 11A, and the mounting recesses for mounting each pedestal are formed on the plastic pedestal 40. Since the elastic protrusions 43 respectively corresponding to 22 are integrally formed, snap fitting can be performed by utilizing the elasticity of plastic, so that the pedestal 40 can be easily attached to the case portion 11A. In addition, it is desirable that each elastic protrusion 43 has a structure that is as short and thick as possible within a range where elasticity can be maintained to increase the joint strength when fitting to the holding case 10 side, and further, the tip of each elastic protrusion 43. Since the locking claw 44 is formed in the portion, and the locking claw 44 is securely fitted into the pedestal mounting fitting concave portion 22, the holding case 10 accommodating the ferrites 30A and 30B falls off from the pedestal 40 due to vibration or the like. There is no danger of In addition, each elastic protrusion 43
Of each locking claw 44 by utilizing the elasticity of
The pedestal 40 can be separated from the holding case 10 by forcibly removing the pedestal 40 from the holding case 10.

(3) Since the plurality of elastic protrusions 50 each having a shape obtained by dividing a ring pressed against the bottom of the case 11A are formed on the upper surface of the plastic pedestal 40, the holding case 10 and the pedestal when the pedestal 40 is attached Rattling between 40 can be absorbed by the elasticity of plastic.

(4) The pedestal 40 has a fitting hole 1 for locking.
7 is provided on the side of the case portion 11A, and the other case portion 11B that is openably and closably connected via the hinge portion 12 is provided with the engaging fitting convex portion 19 for locking.
When attached to the housing 60 or the like by utilizing, the extension portion 16 having the engagement fitting hole portion 17 is positioned upward and is located outside the extension engagement piece 18 having the engagement engagement protrusion portion 19. Since this is done, it is possible to smoothly perform the work of opening and closing the case portion 11B by rotating it (in particular, the operation of opening the closed portion).

(5) The bottom area of the pedestal 40 is the holding case 1 when the noise absorber is viewed from the lower side (case surface side).
Since it does not become larger than 0, it does not hinder the arrangement of other parts on the housing and the printed circuit board.

(6) When it is not necessary to fix it to the housing 60 or the like, the pedestal 40 can be removed from the noise absorbing device main body NF in which the ferrites 30A and 30B are housed in the holding case 10, and the noise absorbing device main body NF can be used. The exterior structure is symmetrical with no specific directionality. When the pedestal 40 is not used, the noise absorbing device body can be fixed by inserting the binding band through the binding band insertion hole 26 and winding it around a cable or the like.

The embodiment of the invention described above is based on the pedestal 4
Although there are two pairs of the elastic projection pieces 43 on the 0 side, in principle, one pair (two pieces) or more may be used, and the elastic projection pieces 4 may be formed as necessary.
It is also possible to set the width of 3 to be large.

Further, although the pedestal mounting fitting concave portion 22 is formed on the side of the holding case 10 into which the elastic projection 43 of the pedestal 40 side is fitted, a pedestal mounting fitting hole portion may be formed.

One case portion 11 of the holding case 10
A fitting hole 17 for locking is formed in the extension portion 16 of A, and the fitting convex portion 19 for fitting of the extension locking piece 18 of the other case portion 11B is fitted into this. If the locking fitting convex portion 19 can be fitted, a locking fitting concave portion may be formed in the extension portion 16.

Further, although the ferrites 30A and 30B have been exemplified as the magnetic bodies to be housed in the holding case 10, composite ferrite obtained by mixing ferrite powder with resin or the like may be used.

Further, although the holding case 10 and the pedestal 40 are made of plastic, other materials can be adopted as long as they are insulating members having appropriate elasticity.

Although the embodiment of the present invention has been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Ah

[0038]

As described above, according to the noise absorbing device of the present invention, the magnetic bodies each having the shape obtained by dividing the annular body are housed in the case portions interconnected by the hinge portions, and the case portions are connected to each other. The magnetic path of the magnetic body forms a closed loop in the closed state, and the pedestal is attached at a position different from the open / close end of the case (a position that does not hinder opening / closing). The opening / closing operation of the case can be performed regardless. As a result, the pedestal is integrated and packed in advance in the case portion containing the magnetic material according to the demand of the user.
It is possible to deliver the product, and it becomes possible for the customer side to easily manage the product and to efficiently fix the electronic device to the housing, the printed circuit board or the like, or fix the cable or the like. Furthermore, after fixing the noise absorbing device to the housing, printed circuit board, etc., it is also possible to open the case part to release the cables, etc., making it easy to remove or replace the printed circuit board etc. during maintenance and inspection. Can be executed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a noise absorbing device according to the present invention, showing a state in which a noise absorbing device main body is opened.

FIG. 2 is a front view showing how the noise absorbing device is fixed to the housing according to the embodiment of the present invention.

FIG. 3 is a side view, partly in section, showing a closed state of the noise absorbing device body according to the embodiment of the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is an exploded front view of the embodiment of the present invention with the main body of the noise absorbing device open.

FIG. 6 is a plan view of the main body of the noise absorbing device according to the embodiment of the present invention in an open state.

FIG. 7 is a bottom view of the noise absorbing device body according to the embodiment of the present invention in a closed state.

FIG. 8 is an enlarged side view showing the main parts of the holding case opening / closing structure according to the embodiment of the present invention.

FIG. 9 is a plan view showing a pedestal according to the embodiment of the present invention.

FIG. 10 is an exploded perspective view showing a conventional device.

[Explanation of symbols]

 CA cable NF Noise absorbing device main body 10 Holding case 11A, 11B Case portion 12 Hinge portion 13 Elastic tongue portion 14 Retaining claw 15 Notch 16 Extension portion 17 Locking fitting hole portion 18 Extension locking piece 19 Locking fitting Convex portion 20A, 20B Flange-shaped convex portion 21A, 21B through hole 22 Pedestal mounting fitting concave portion 30A, 30B Ferrite 40 Pedestal 41 Pedestal main body 42 Rib 43 Elastic projection piece 44 Locking claw 45 Elastic pressing tongue piece 46 For mounting Cylindrical body 47 Detachment prevention claw 48 Slit groove 50 Elastic protrusion 60 Housing

Claims (4)

[Claims] 1. A magnetic body having a shape obtained by dividing an annular body is housed in a case portion interconnected by a hinge portion, and a magnetic path of the magnetic body forms a closed loop in a state where the case portion is closed. In the noise absorbing device which comprises, the pedestal was attached to the position different from the opening-closing end part of the said case part, The noise absorbing device characterized by the above-mentioned. 2. A pedestal attachment fitting portion is formed on the case portion, and an elastic projection portion fitting with the pedestal attachment fitting portion is integrally formed on the pedestal portion, and the pedestal portion is formed on the case portion. The noise absorbing device according to claim 1, which is detachably attached. 3. The noise absorbing device according to claim 1, wherein an elastic protrusion that is in pressure contact with the bottom of the case is formed on the upper surface of the pedestal. 4. A locking fitting hole portion or a recess is integrally formed at an opening / closing end portion of one case portion to which the pedestal is attached, and the other case portion openable / closable with respect to the one case portion is 4. The noise absorbing device according to claim 1, wherein the engaging fitting convex portion that fits into the engaging fitting hole portion or the concave portion is integrally formed.