JPH0412653Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applied to electric wires of electronic equipment to absorb noise current generated inside the electronic equipment, or noise current generated externally and flowing into the electronic equipment through the electric wire. This invention relates to a noise absorbing device.

[Prior Art] As a method of absorbing noise flowing through an electric wire, a technique is known in which a magnetic material such as ferrite is fitted around the electric wire, and the ferrite absorbs the noise current flowing through the electric wire.

For example, as disclosed in Japanese Utility Model Application Publication No. 57-85756, between a pair of magnetic bodies each having a flat dividing surface facing each other and a cover having a hook portion to be hooked to each other. It is known that the noise absorber itself is attached in the middle of the wire by sandwiching the wire between the wires.

Rather than attaching the wire by inserting it through the magnetic material from its end, the wire is sandwiched between a pair of magnetic materials, making it possible to install the wire without removing the existing wiring. This makes the work easier.

[Problem to be solved by the invention] Originally, devices using divided magnetic materials had the problem of increased magnetic resistance due to the gap between the divided surfaces, and in order to reduce the magnetic resistance, it was necessary to separate the divided surfaces It needs to be crimped.

However, in the conventional device, the hooking portion of the cover serves both the function of attaching the device to the electric wire and the function of crimping the divided surfaces of the magnetic material with a single force. Magnetic materials manufactured by methods such as sintering may have variations in size and shape, but when these variations occur, it may cause problems such as crimping the split surface when the hook is hooked and attached to the wire. This results in the inconvenience of no elasticity.

For example, if the magnetic material is smaller than the shape that fits the cover, there may be a gap at the dividing surface or a gap between the cover and the magnetic material, which may cause problems such as impossibility of crimping and noise. Absorption performance deteriorates.

Therefore, the present invention was developed to solve the above problems, and it is possible to securely and continuously hold the magnetic material around the wire, and it can be easily replaced and removed. The present invention provides a noise absorber that can satisfactorily absorb noise current and prevent noise.

[Means for Solving the Problems] To this end, the noise absorber of the present invention includes a magnetic body formed in a shape surrounding the outer periphery of an electric wire of an electronic device and divided in the axial direction, and a magnetic body that is divided into two parts. A noise absorbing device comprising a holding case made of synthetic resin that has a housing case portion and which can be opened and closed, and absorbs noise current flowing through the electric wire by crimping the divided surfaces of the magnetic body to each other. A first engaging portion is provided on the magnetic body, and the first engaging portion is loosely fitted into the case portion to allow movement of the magnetic body within the case portion, and the magnetic body is provided with a first engaging portion. A second engaging portion capable of preventing detachment is provided, and further includes a spring portion having one end fixed, and a protrusion protruding inside the case portion, and the magnetic body housed in the case portion comes into contact with the protrusion. The present invention is characterized in that the case portion is provided with a biasing claw that elastically deforms the spring portion and biases the magnetic body in the direction of the dividing plane.

[Function] Therefore, when attaching the noise absorber to an electric wire, the divided magnetic material is placed in an openable and closable case part, and the case parts are closed so as to sandwich the electric wire. Then, the magnetic body comes into contact with the protrusion of the biasing pawl that protrudes inside the case, the protrusion is pushed toward the outside of the case, and the spring part of the biasing pawl is elastically deformed to bias the magnetic body in the direction of the split surface. , the split surfaces can be crimped together.

Furthermore, the protrusion provided inside the case portion engages with the engaging portion provided on the magnetic body, thereby preventing the magnetic body from separating from the case portion.

The engaging portion loosely fits into the protrusion and does not hinder the movement of the magnetic material within the case portion when the magnetic material dividing surface is crimped by the aforementioned biasing pawl.
Therefore, the noise current flowing through the electric wire can be suitably absorbed.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a perspective view of a holding case 1 of a noise absorber, and the holding case 1 is composed of two case parts 2 and 3 connected via a hinge 4. As shown in FIG. The case parts 2 and 3 are formed so as to house the ferrite 5, which is a magnetic material, in the shape shown in FIG. Four biasing claws 6 and 7 are respectively provided so as to be elastically deformable and protrude inward in order to bias them upward.

In this embodiment, the biasing claws 6 and 7 include spring parts 6a and 7a, which are cut out in the bottom of the case parts 2 and 3 in a U-shape and are positioned with one end fixed, and the case parts 2 and 3. It is provided with protrusions 6b and 7b that protrude inwardly. The protrusions 6b, 7b are provided on the free movement side of the spring parts 6a, 7a.
Various shapes of the protrusions 6b, 7b other than those shown are possible.

Further, on the front surfaces of the case parts 2 and 3 (the surfaces shown in FIGS. 4 and 6), wide presser claws 8 and 9 for pressing the upper edge of the ferrite 5 are provided at the center thereof. Further, on both sides thereof, two pairs of engagement claws 10 and 11, which are second engagement parts that engage with the engagement grooves 5a, which are first engagement parts provided on both sides of the ferrite 5, are provided.
It is provided toward the inside of the case parts 2 and 3. To explain the engagement between the engagement groove 5a and the engagement claws 10 and 11, as shown in FIG.
a is loosely fitted into the engaging claws 10 and 11, and the ferrite 5 is allowed to move up and down to some extent within the case parts 2 and 3, respectively.

Note that the first and second engaging parts are not limited to the engaging groove 5a and the engaging claws 10 and 11 described above, but for example, a convex engaging part is provided on the ferrite 5 side, and the case part 2 , 3 side may be provided with a concave engaging portion.
Alternatively, both the ferrite 5 and the case parts 2 and 3 may be provided with convex engaging parts for engagement.

Further, tall locking hooks 12 are provided on both sides of the engaging claw 10 of the case part 2, while two case parts are closed on both sides of the engaging claw 11 of the case part 3 on the opposite side. A locking pawl 13 and a protrusion 14 that are locked with the locking hook 12 are provided. Further, a pair of engagement claws 15 similar to this claw are provided on a wall portion of the case portion 2 facing the engagement portion 10, and a pair of engagement claws 15 facing inward are also provided on a wall portion of the case portion 3 facing the engagement portion 11. A pair of similar engaging claws 1 is also provided in the section.
6 is provided facing inward. Further, the side walls on both sides of the case part 2 are provided with cutouts 17 having substantially semicircular teeth 17a for passing electric wires, and the side walls of the case part 3 are also provided with cutouts 18 having similar teeth 18a. is provided.

As shown in FIG. 11, the ferrite 5 has a groove 5b with a semicircular cross section for passing the electric wire through the upper surface of the rectangular parallelepiped.
is formed by drilling in the longitudinal direction and providing engagement grooves 5a on both sides.

The holding case 1 is integrally formed of synthetic resin,
Appropriate elasticity is given to each claw or hook.

The ferrite 5 is inserted into the case parts 2 and 3 of the holding case 1 as described above. When the ferrite 5 is inserted into the case part 2, the upper edge is held down by a claw 8.
He was pressed against the opposite wall, and both sides 2
The pair of engaging claws 10 and 15 are the engaging grooves 5 of the ferrite 5.
By engaging with a, it is stably held within the case portion 2 without wobbling in the left-right direction.

Similarly, inside the case part 3, the inserted ferrite 5 is pressed against the opposing wall with its upper edge pressed by the presser claw 9, and the engaging groove 5a of the inserted ferrite 5 is pressed against the opposing wall.
is engaged with the two pairs of engaging claws 11 and 16 on both sides of the case portion 3, thereby being stably held within the case portion 3 without wobbling in the left-right direction.

When the ferrite 5 is inserted into the case parts 2 and 3, the engagement groove 5a is connected to the engagement claws 10, 11, 15, 16.
The ferrite 5 is simply fitted loosely into the case parts 2 and 3 to prevent it from coming off from the case parts 2 and 3, for example, when the case parts 2 and 3 are turned upside down. Therefore,
For example, if a part of the ferrite 5 is damaged and you want to replace it, or conversely, if you want to replace only the case parts 2 and 3, this can be done very easily.

In this way, the ferrite 5 is placed inside the case parts 2 and 3.
As shown in FIG. 12, the holding case 1 is inserted into the case part 2 with the electric wire 30 passed between the case parts 2 and 3 so as to be fitted around the outer periphery of the electric wire 30 of the electronic device. The case part 3 is closed and attached so as to be placed over the case part 3. When closed, the locking pawl 13 of the case part 3 is locked with the locking hook 12 of the case part 2, and the closed state is reliably maintained.

Furthermore, when closed, the ferrite 5 comes into contact with the protrusions 6b, 7b of the urging claws 6, 7 at the bottom of the case parts 2, 3, and pushes the protrusions 6b, 7b to the outside of the case parts 2, 3. Then, the spring parts 6a and 7a are elastically deformed and bias the divided surfaces 5c of both ferrites 5 in the direction of alignment, so that the divided surfaces 5c of the ferrite 5 are pressed together and held in a stable state without wobbling. be done.

At this time, the size of the ferrite 5 is
Ferrite 5 even if it is smaller than the shape that fits
When the spring portions 6a, 7a come into contact with the protrusions 6b, 7b and elastically deform, both ferrites 5 are biased toward the dividing surface 5c, and the dividing surfaces 5c can be pressed together. In this way, the locking hook 1
2 and the locking claw 13 closes the holding case 1 and attaches the device itself to the electric wire 30, and in addition to this action, the biasing claws 6 and 7 bias the ferrite 5. Due to the elastic deformation of the spring portions 6a and 7a, variations in the size of the ferrite 5 can be absorbed and the dividing surfaces 5c can be pressed together.

On the other hand, the engagement groove 5a has engagement stops 10, 11, 15,
16, and does not hinder the movement of the ferrite 5 within the case parts 2, 3 as the ferrite 5 is biased by the biasing claws 6, 7, the dividing surface 5c of the ferrite 5 is They abut and press against each other and are held in a stable state without wobbling. Also,
For the electric wire 30, as shown in FIG.
7a is pressed, and the holding case 1 is clamped to the outer periphery of the electric wire 30.

Note that when biasing by the biasing claws 6 and 7, the protrusion 6
Since b and 7b are in contact with the ferrite 5, they are more likely to be caught than, for example, in a plane contact, and prevent the ferrite 5 from moving in a direction parallel to the dividing surface 5c.

Even if the dividing surfaces 5c are crimped together, the dividing surfaces 5c
If the ferrite 5 shifts in a direction parallel to , there is a possibility that the noise absorption performance will deteriorate at the moment of the shift. However, as mentioned above, the protrusions 6b, 7b
is in contact with ferrite 5, ferrite 5
It is also possible to prevent a shift in the direction parallel to the dividing plane 5c, thereby achieving more suitable noise absorption.

An appropriate number of holding cases 1 into which such ferrite 5 is inserted are fitted and fixed onto the electric wire 30, and the electric wire 30
By surrounding the electric wire 30 with ferrite 5, which is a magnetic material, the noise current flowing through the electric wire 30 is absorbed by the ferrite 5, and the generation of noise is prevented. In general, it is preferable to use a measuring device to find and determine the position where the external fitting is to be fixed, with a good amount of noise absorption and efficiency. In this case, it is preferable to determine the optimum number experimentally based on the noise absorption effect. Further, the ferrite 5 absorbs noise current (noise) generated outside the electronic device and intrudes into the electronic device through the electric wire 30, and prevents the intrusion.

In addition, when changing the assembly position of the holding case 1 or removing it, use the locking hook 1 of the case part 2.
2 toward the front, it is easily disengaged from the locking pawl 13, the case parts 2 and 3 can be opened, and the case parts 2 and 3 can be easily replaced and removed. At this time, the holding case 1 can also be fixed to a part of the electronic device by pasting double-sided adhesive tape on either or both of the case parts 2 and 3 as needed.

Furthermore, since the ferrite 5 is held by the case parts 2 and 3, the ferrite 5 will not come off from the case parts 2 and 3 during installation and removal operations. Therefore, there will be no inconveniences such as the ferrite 5 and the case parts 2 and 3 becoming misaligned during work, or the ferrite 5 falling into electronic equipment and causing adverse effects, and also preventing other electric wires, equipment, etc. from getting in. Even when attached to the electric wire 30 in a narrow space, there is no need to worry about the ferrite 5 coming off from the case parts 2 and 3.
Since it is only necessary to close the holding case 1, the work can be performed extremely easily.

In addition, as shown by the imaginary line in FIG. 6, a leg part 31 with a check piece is attached to the bottom of the case part 2 or 3, and the holding case 1 is attached to the leg part 3 to a part of an electronic device.
It can also be fixed by 1.

A soft magnetic material is suitable as the magnetic ferrite 5, and a molded product obtained by mixing soft magnetic powder with plastic, synthetic rubber, etc. can also be used.

FIG. 14 shows a second embodiment of the present invention, in which the hinge 4 is not provided. Instead, the case portion 22 is provided with one locking hook 112 and one projection 114 on one side, and a projection 114 is also provided at a position facing the locking hook 112.

Furthermore, a biasing pawl 106 including a spring portion 106a and a protrusion 106b is provided at the bottom of the case portion 22, as in the first embodiment.

Two case portions 22 are prepared, ferrite 5 is housed in each case, and the electric wires 30 are sandwiched between the case portions 22 so as to face each other vertically and fixed. When pinched, the lower locking hook 112 is engaged with the upper protrusion 114.

Even if the second embodiment is used, the noise absorber can be easily attached to the electric wire 30, and since the biasing claw 106 biases the ferrite 5 as a function different from this mounting function, the spring portion 106a Due to the elastic deformation, variations in the size of the ferrite 5 can be absorbed and the divided surfaces 5c can be pressed together, and the movement of the ferrite 5 within the case portion 22 by the biasing claw 106 is not hindered. Further, the effect of preventing the ferrite 5 from coming off from the case portion 22 during installation work is similar to that of the first embodiment.

[Effect of the invention] As explained above, according to the noise absorption sound of the invention, the magnetic body formed in a shape surrounding the outer periphery of the electric wire and divided in the axial direction has a case part that can be opened and closed. Since each noise absorber is inserted into the case part of the holding case, the noise absorber can be easily attached to the electric wire by simply passing the electric wire between them and closing the case part, making it easy to replace and remove it. It is easy to do and can be worn consistently and reliably.

By elastically deforming the biasing pawl having a protrusion and a spring portion that protrude inside the case, the magnetic body is biased in the direction of the dividing surface 5 as an effect different from the effect of attaching it to the electric wire described above. Furthermore, even if the size and shape of the magnetic body vary, the amount of elastic deformation can be changed accordingly, and the divided surfaces can be pressed together. Therefore, noise current flowing through the wire can be absorbed.

Further, the magnetic body is loosely fitted into the case portion, so that the movement of the magnetic body within the case portion is not hindered when the dividing surface is crimped. This prevents the magnetic body from separating from the case portion during work such as installation, and furthermore, it is possible to replace only the magnetic body very easily. In addition, since the magnetic material is housed in the case, the case acts as an insulator, and even if a conductive material such as manganese/zinc ferrite is selected as the magnetic material, short circuits and electric shock may occur in electronic equipment. etc. can be prevented.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a perspective view of the holding case, Fig. 2 is a plan view thereof, Fig. 3 is a left side view thereof, Fig. 4 is a front view thereof, and Fig. 5 is a bottom view thereof. Fig. 6 is a rear view of the same, Fig. 7 is a - sectional view of Fig. 2, Fig. 8 is a - sectional view, Fig. 9 is a - sectional view, Fig. 10 is a - sectional view, and Fig. 11 is a - sectional view. FIG. 12 is a perspective view of the ferrite, FIG. 12 is a perspective view when the noise absorber is attached, FIG. 13 is a left side view of the attached state, and FIG. 14 is a perspective view showing a second embodiment of the present invention. 1... Holding case, 2, 3... Case part, 5...
...Ferrite, 5c...Divided surface, 5a...Engagement groove 5a (=first engagement part), 6a, 7a...Spring part,
6b, 7b... protrusion, 10, 11... engaging claw (=
second engaging portion), 30... electric wire.

Claims (1)

[Claims for Utility Model Registration] A magnetic body formed in a shape that surrounds the outer periphery of an electric wire of an electronic device and divided in the axial direction, and a case part that houses each of the magnetic bodies, and the case part can be opened and closed. and a holding case made of synthetic resin, the divided surfaces of the magnetic body are crimped together to absorb the noise current flowing through the electric wire, the noise absorber comprising: a first engaging portion provided on the magnetic body; a second engaging portion is provided in the case portion, and is capable of loosely fitting into the first engaging portion to allow movement of the magnetic body within the case portion and prevent separation of the magnetic body; Furthermore, it includes a spring portion having one end fixed, and a protrusion protruding inside the case portion, and the magnetic body housed in the case portion contacts the protrusion, elastically deforms the spring portion, and causes the magnetic body to move. A noise absorber characterized in that a biasing claw that biases in the direction of the dividing plane is provided on the case portion.