JP2000286127A - Core-mounting case and noise absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core-mounting case and a noise absorber, which can be mounted easily to a signal line and have a less number of parts with high reliability. SOLUTION: A noise absorber 10 includes a magnetic core 12 and a core mounting case 13 for removably holding the core 12 thereinside. The case 13 has case parts 21 and 22 coupled with a hinge 24. The case parts 21 and 22 are provided respectively with a comb-shaped tongue part 25 for grippingly holding a signal line 11 and a plate-shaped spring part 26 for pushing the outer peripheral surface of the core 12. Furthermore, the case part 22 is provided with an engagement 32 for hinge engagement, while the case part 21 is provided with an engagement projection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core mounting case and a noise absorbing device, and more particularly to a noise absorbing device which is mounted on a signal line of an electronic device and which absorbs noise generated inside the electronic device and noise entering the electronic device from the outside. To a noise absorbing device.

[0002]

2. Description of the Related Art Conventionally, as a noise absorbing device of this type, for example, a ferrite core is attached to a signal line for supplying power to an electronic device, and the ferrite core absorbs a noise current flowing through the signal line of the electronic device. Things are known. The ferrite core is cylindrical and is divided into two along a hole through which the signal line is inserted. The ferrite core is housed in a core mounting case, and is mounted on the signal line of the electronic device so as to surround the outer periphery of the signal line by the case.

[0003] The core mounting case is composed of two case parts joined by a hinge, and the two case parts accommodate the ferrite cores divided into two parts. At the same time, the ferrite core is closed by sandwiching the signal line between the two case portions accommodated therein, and at the same time, the locking portion provided on the case portion is automatically locked, and the ferrite core is attached to the signal line. . Inside the core mounting case,
A cantilever leaf spring whose one end is open is loaded. Due to the elasticity of the leaf spring, the ferrite core is held in the core mounting case in a state where the ferrite core is crimped on the divided surface.

[0004]

By the way, the conditions required for the core mounting case are that the fixing strength to the signal line is strong and that the ferrite core is supported in the center of the core mounting case. For example, the divided surfaces may be surely adhered to each other, and the signal lines may be smoothly guided so that the signal lines are not sandwiched between the divided surfaces of the ferrite core. However, the conventional core mounting case does not sufficiently satisfy these conditions.

Further, in general, after mounting a noise absorbing device at a predetermined position of a signal line of an electronic device, it is desired to correct a defect such as a shift of a divided surface of a ferrite core or a signal line being sandwiched between divided surfaces of a ferrite core. Sometimes, it is necessary to change the mounting position to a position where the noise current can be more efficiently absorbed. In such a case, the lock of the core mounting case of the noise absorbing device must be once released. However, in the conventional core mounting case, the locking portion is automatically locked at the same time as the signal wire is closed, so that it is necessary to use a tool or the like to release the lock. And the like is complicated.

Further, since the leaf spring loaded in the conventional core mounting case is a cantilever spring, it is easily deformed or damaged, and the holding of the ferrite core is unstable. Furthermore, some conventional core mounting cases are loaded with metal leaf springs as leaf springs for crimping the ferrite core on the split surface, and the number of parts is large, and as a result, assembly There was also a problem that the man-hour increased.

An object of the present invention is to provide a core mounting case and a noise absorbing device which can be easily attached to and detached from a signal line, have a small number of components, and have high reliability.

[0008]

In order to achieve the above object, a core mounting case according to the present invention comprises: (a) hinge-coupled to a hinge portion rotatably around a hinge portion along an axial direction of a signal line; A first case portion and a second case portion each having a signal line holding portion for holding the signal line in cooperation with each other;
(B) A spring portion provided on at least one of the first case portion and the second case portion such that the longitudinal direction is the outer circumferential direction of the case portion and presses the outer circumferential surface of the magnetic core. (C) a locking projection provided on the first case portion, and (d) a locking portion hingedly connected to the second case portion and engaged with the locking projection by bending, and (e). )
The signal line holding portion is a comb-shaped tongue protruding in a direction substantially orthogonal to an axial direction of the signal line.

With the above arrangement, when the signal line of the electronic device is disposed between the first case portion and the second case portion and rotated around the hinge portion, the signal lines of the first and second case portions are held. The comb-shaped tongue portion, which is a portion, holds the signal line and presses the outer peripheral surface of the signal line from outside in the radial direction. In this state, when the locking portion is bent at the hinge connection position and engaged with the locking protrusion, the first case portion and the second case portion are securely mounted at predetermined positions of the signal line. Then, when the engagement with the locking projection is released by raising the locking portion, the core mounting case is easily detached from the signal line.

Further, by bending the comb-shaped tongue, the variation in the holding position of the signal line can be suppressed. Also,
By making the thickness of the plurality of comb-shaped tongues different, or by changing the arrangement pitch of the plurality of comb-shaped tongues,
A pressing force corresponding to the diameter of the signal line is obtained.

Further, the noise absorbing device according to the present invention is provided with one of the core mounting cases having the above-described features,
A cylindrical magnetic core divided into two along a hole through which the signal line is inserted. According to the above configuration, the spring portion provided in the core mounting case ensures that the divided surfaces of the magnetic core are in close contact with each other.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a core mounting case and a noise absorbing device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the overall configuration of one embodiment of a noise absorbing device according to the present invention. The noise absorbing device 10
Is a magnetic core 12 made of ferrite, and a core mounting case 1 for detachably holding the magnetic core 12 inside.
And 3.

The magnetic core 12 is made of, for example, ferrite, and absorbs a noise current propagating through the signal line 11 of the electronic device. The magnetic core 12 has a cylindrical shape, and the signal line 11 is inserted into the through hole 14 to surround the outer periphery of the signal line 11. The magnetic core 12 is divided into two core members 15a and 15b by a plane including the central axis of the through hole 14. The core members 15a and 15b are connected to the signal lines 1 through the through holes 14.
1 is held in the core mounting case 13 with the divided surfaces abutting each other.

The core mounting case 13 is made of a flexible resin, and as shown in FIG.
It is composed of The case portions 21 and 22 are hinged integrally so as to be rotatable around a hinge portion 24.
Each of the case portions 21 and 22 has an arc-shaped cross section,
Its inner wall surface is curved in accordance with the outer surface of the magnetic core 12. Semi-annular holding plates 23 are provided at both ends of the case portions 21 and 22, respectively. The holding plate 23 is provided with a plurality (three in this embodiment) of comb-shaped tongues 25 protruding in a direction substantially orthogonal to the axial direction of the signal line 11 on both sides thereof. The comb-like tongue 25 holds the signal line 11. However, the number of the comb-shaped tongues 25 does not necessarily need to be provided on each side of the holding plate 23. For example, if the diameter of the signal line 11 to be used is constant, only one signal line may be provided on each side.

The case portions 21 and 22 are integrally provided with two plate-like spring portions 26 at predetermined intervals. The longitudinal direction of the plate-shaped spring portion 26 is the outer circumferential direction of the case portions 21 and 22 (in other words, the magnetic core 12
(In the outer circumferential direction of the vehicle). Therefore, the spring force of the plate-like spring portion 26 works toward the center of the core mounting case 13. As shown in FIG. 3, each of the plate-like spring portions 26 connects two peak portions 26a with a valley portion 26b. The two peaks 26a are connected to the case 21 or the case 2
It is arranged so that it may be located on the same circumference inside 2.
As a result, the ridges 26a of the respective plate-like spring portions 26 evenly press the outer peripheral surfaces of the core members 15a and 15b. Also, by connecting the two ridges 26a at the valleys 26b, if one of the ridges 26a is forced to sink, the other ridge 26a
Is deformed in the direction of sinking by being pulled by the valley portion 26b, and the core members 15a and 15b as a whole are held with a uniform force.
Therefore, in a state where the magnetic core 12 is supported at the center of the core mounting case 13, the joining surfaces of the core members 15a and 15b can be securely brought into close contact.

Further, since the plate-like spring portion 26 is a double-sided spring whose both ends are fixed to the case portion 21 or 22, unlike the cantilever spring, the temperature change when it is taken out of the molding die, Deformation and damage due to contact between products and external force applied during work hardly occur. Moreover, the plate-like spring portion 2
6 has a structure in which extra windows of the case portions 21 and 22 are smaller than those of the cantilever springs, so that dust from the outside world does not easily enter the core mounting case 13.

At the edge of the opening of the case portion 21, a hinge portion 2 is provided.
A locking projection 31 is provided at the center of the side opposite to the side on which
Are protruding outward. As shown in FIG. 4, the locking protrusion 31 has a locking protrusion 31a having a triangular cross section. On the other hand, the hinge portion 24
A locking portion 32 protrudes outward at a central portion opposite to the side provided with. As shown in FIG. 5, the locking portion 32 has a substantially U-shape, and has a triangular cross section on the inner side for engaging with the locking ridge 31 a of the locking projection 31. 32
a is formed. The locking portion 32 and the case portion 22 are hingedly connected by hinge portions 33, 33. As described above, the core mounting case 13 includes the case portions 21 and 22,
Since the hinge portions 24, 33, the locking projection 31, the locking portion 32, and the like are integrally formed, the number of components is reduced, and assembly is facilitated. In addition, the shape of the locking portion 32 can be selected to be an arbitrary shape such as a square shape, a circular shape, or a semicircle according to the specification.

Next, a procedure for attaching the noise absorbing device 10 having the above-described configuration to the signal line 11 will be described with reference to FIG. As shown in FIG. 6A, the signal line 11 is arranged on the comb-like tongue portion 25 of the case portion 21 of the core mounting case 13 and the case portion 22 is hinged toward the case portion 21. Rotate around 24. Then
The comb-shaped tongue portions 25 of the case portions 21 and 22 bend while pressing the signal line 11 from above and below, and the signal line 11 is bent by the comb-shaped tongue portion 2.
5 sandwiched.

Since the signal line holding portion is formed in a multi-stage shape like a comb, it can flexibly cope with signal lines 11 having various diameters. That is, when the diameter of the signal line 11 is small, only the comb-like tongue 25 located on the upper stage presses the signal line 11. As the diameter of the signal line 11 increases, the comb-shaped tongue 25 located at the middle stage also presses the signal line 11 in addition to the upper comb-shaped tongue 25, thereby holding the signal line 11 more firmly. .
Further, when the diameter of the signal line 11 is increased, the comb-like tongue 25 located at the lower stage is also applied, and a sufficient pressing force for holding the thick signal line 11 is obtained. Further, since the signal line holding portion is the comb-like tongue portion 25, the through hole 1 of the magnetic core 12 is formed.
As long as it is a signal line 11 through which the signal line 4 can be inserted, any signal line having a circular cross section, a circular shape, a rectangular shape, or a flat shape may be used.

Next, as shown in FIG. 6B, each of the comb-like tongues 25 of the case portions 21 and 22 is connected to the signal line 11.
And the outer periphery of the signal line 11 is slightly deformed. Only the portion of the signal line 11 sandwiched by the comb-like tongue portions 25 is deformed, and the other portions are not deformed. Therefore, the core mounting case 13 is firmly fixed to a predetermined position of the signal line 11. In this manner, the case portions 21 and 22 are closed to confirm that the signal line 11 is securely sandwiched between the comb-like tongue portions 25, and then, as shown in FIG.
The locking portion 32 of the case portion 22 is bent at the position of the hinge portion 33 to engage with the locking protrusion 31 of the case portion 21.

Thus, the case portions 21 and 22 are combined, and the core mounting case 13 is securely fixed to a predetermined position of the signal line 11. Accordingly, by accommodating the core members 15a and 15b in the case portions 21 and 22, respectively, the joining surfaces of the core members 15a and 15b are abutted in the core mounting case 13 to form the cylindrical magnetic core 12. Since the plate-shaped spring portion 26 is arranged in the outer peripheral direction of the cylindrical magnetic core 12, the spring force of the plate-shaped spring portion 26 is uniformly applied to the outer peripheral surface of the magnetic core 12, and the core member 15
The connection surfaces of the signal lines 11a and 15b are securely attached to each other and are mounted at predetermined positions of the signal line 11.

When the user wants to remove the noise absorbing device 10 from the signal line 11, the locking portion 32 of the case portion 22 is raised to release the engagement with the locking projection 31. Next, the combination of the case portions 21 and 22 may be loosened by rotating the case portion 21 or 22 in the direction in which the case portions 21 and 22 are deployed. When it is desired to change the mounting position of the noise absorbing device 10, the core mounting case 13 is connected to the signal line 11.
To the desired position. Then, FIG.
After the case portions 21 and 22 are combined again in the procedure described in (C), the locking portion 32 of the case portion 22 is bent and engaged with the locking protrusion 31. In this manner, the noise absorbing device 10 can be easily attached to and detached from the signal line 11 without using a tool.

The present invention is not limited to the above-described embodiment, and may have various configurations within the scope of the present invention. For example, as the holding plate of the case portion, FIG.
(A) Holding plate 2 provided with comb-like tongue 25
Instead of 3a, as shown in FIGS. 7B and 7C, a holding plate 23b provided with a comb-shaped tongue portion 25b having a bent end portion, or a comb-tooth shape in which the whole is inclined. A holding plate 23c provided with a tongue 25c may be used. Comb-shaped tongue 25
b and 25c suppress variations in the holding position of the signal line.

As shown in FIGS. 7D and 7E, the holding plate 23d provided with the comb-shaped tongues 25d having different thicknesses, and the comb-shaped tongues 25e having different arrangement pitches. May be provided as the holding plate 23e. Comb-shaped tongue 25d,
With 25e, a pressing force according to the diameter of the signal line is obtained. For example, in the case of the comb-shaped tongue portion 25d, a small-diameter or thin signal line is held only by the thin-walled comb-shaped tongue portion 25d located at the upper stage. And large diameter and thick signal lines are
Thick comb-shaped tongue 25d located in the middle and lower tiers
Is also retained.

Further, by forming the tip of the comb-shaped tongue portion into a shape conforming to the cross-sectional shape of the signal line, the comb-shaped tongue portion can be more securely fitted and held on the signal line. . FIG. 7F shows a holding plate 23f provided with a comb-like tongue 25f adapted to a signal line 45 having a rectangular cross section. Further, the combination of the comb-shaped tongue portions provided on the two cooperating holding plates is arbitrary, for example, as shown in FIG.
To (F). Also, some signal lines have slippery surfaces,
Protrusions are provided on the tip surface of the comb-shaped tongue, or
The surface of the tip of the comb-shaped tongue may be roughened so that the signal line is less likely to slip at the time of pinching.

[0027]

As is clear from the above description, according to the present invention, the signal line holding portion is a comb-shaped tongue portion projecting in a direction substantially perpendicular to the axial direction of the signal line. It is possible to flexibly cope with signal lines of various diameters. And
The comb-like tongues of the first case portion and the second case portion can securely and firmly sandwich the signal line. In addition, the comb-shaped tongue can hold any signal line having a circular cross section, such as a circular shape, a rectangular shape, or a flat shape, as long as the signal line can be inserted through the hole of the magnetic core. it can.

Further, since the locking projection is provided on the first case portion and the locking portion is hingedly connected to the second case portion, the first case portion and the second case portion are closed, and the signal line becomes a signal line. After confirming that the wire is securely held in the wire holding portion, the locking portion is bent at the hinge connection position to engage with the locking protrusion, and the core mounting case is fixed at a predetermined position of the signal line. be able to. Then, when the engagement with the locking projection is released by raising the locking portion, the core mounting case is easily detached from the signal line. Therefore, the core mounting case is
It can be easily attached to and detached from the signal line without using a tool or the like.

Further, since the spring portion is provided on at least one of the first case portion and the second case portion so that the longitudinal direction is the outer circumferential direction of the case portion.
The spring portion can uniformly press the outer peripheral surface of the two-part cylindrical magnetic core. As a result, the divided surfaces of the magnetic core can be securely brought into close contact.

Further, by bending the comb-shaped tongue portion, it is possible to suppress the variation in the holding position of the signal line. Further, by changing the thickness of the plurality of comb-shaped tongue portions or changing the arrangement pitch of the plurality of comb-shaped tongue portions, it is possible to obtain a pressing force corresponding to the diameter of the signal line. .

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of a core mounting case used in the noise absorbing device shown in FIG.

FIG. 3 is a perspective view showing a spring portion of the core mounting case.

FIG. 4 is a perspective view showing a locking projection of the core mounting case.

FIG. 5 is a perspective view showing a locking portion of the core mounting case.

FIG. 6 is an explanatory view showing a procedure for fixing a core mounting case to a signal line.

FIG. 7 is an explanatory view showing another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Noise absorption device 12 ... Magnetic core 13 ... Core mounting case 14 ... Through-hole 15a, 15b ... Core member 21, 22 ... Case part 24 ... Hinge part 25, 25b, 25c, 25d, 25e, 25f ... Comb tooth Tongue 26 26 Spring 31 Locking projection 32 Locking 33 Hinge

Claims (5)

[Claims] 1. A magnetic core is detachably held inside.
In a core mounting case surrounding the outer periphery of the signal line together with the magnetic core, a hinge is rotatably hinged around a hinge portion along the axial direction of the signal line, and cooperates to clamp the signal line. A first case portion and a second case portion each having a signal line holding portion, and a longitudinal direction of at least one of the first case portion and the second case portion is an outer circumferential direction of the case portion. A spring portion for pressing the outer peripheral surface of the magnetic core, a locking projection provided on the first case portion, and a hinge connected to the second case portion, and the locking by bending. A locking portion that engages with the protruding portion, wherein the signal line holding portion is a comb-shaped tongue portion protruding in a direction substantially orthogonal to an axial direction of the signal line. Mounting case. 2. The core mounting case according to claim 1, wherein said comb-shaped tongue is bent. 3. The core mounting case according to claim 1, wherein the plurality of comb-shaped tongue portions have different thicknesses. 4. The core mounting case according to claim 1, wherein a plurality of said comb-shaped tongues are arranged at different pitches. 5. A core mounting case according to claim 1, further comprising: a cylindrical magnetic core divided into two along a hole through which the signal line is inserted. A noise absorbing device, characterized in that: