JPH0579917U - Noise absorber - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a noise absorbing device in which the core is easily attached and the core and the core holder are not easily damaged. [Constitution] Case portions (21, 22) of the core holder
The fixing of the split cores (24, 24) to the core was performed with an adhesive that exhibits elasticity after curing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a noise absorbing device having two cores and a holder having a case for accommodating each of the cores and having a signal line penetrating therethrough.

[0002]

[Prior Art]

 In order to absorb noise in the signal line, it is well known that the split type cylindrical core is installed so as to penetrate the signal line and cover the outer periphery of the signal line. At this time, as shown in FIG. 2, there are two case portions 11 and 12 for accommodating the split cores 14 and 14, respectively, and one end of each of the case portions 11 and 12 is hinged to the hinge 13 as necessary. It uses a core holder that can be opened and closed by using the.

Here, as a measure for fixing the split cores 14 and 14 to the case portions 11 and 12, a concave portion 14a is provided in the split cores, and a case portion corresponding to the concave portion 14a is provided for preventing core separation. The structure is such that the projections 11a and 12a are provided (for example, Japanese Utility Model Publication No. 2-34875). Reference numerals 11b and 12b are hooks for holding the closed state when the case portions 11 and 12 are closed together.

Further, when a noise absorbing device of this type is attached to a signal line, the split cores are pressed against each other in the holder, and as a measure for preventing noise leakage, one end is fixed to a spring part. There were some cases in which a biasing claw with a protrusion that protrudes inside the case was attached to the inside of the case. (For example, Jitsukaihei 2-52323). Further, similar to the above, as another method of core pressure welding, there are a method in which a spring is inserted between the core and the case and a method in which a cushion piece is inserted.

[0005]

[Problems to be solved by the device]

 However, the core produced by the above method is apt to be cracked or chipped from the recess. In addition, the protrusions for preventing core detachment of the case portion are vulnerable to stress, and are therefore easily damaged. Also, since play is provided in the case itself to facilitate mounting of the core, if the core detachment prevention structure is damaged, the core may detach There was a flaw.

Further, the biasing claws according to the above-mentioned measures are likely to be lost, and the defective ones have a drawback that the noise absorption effect is remarkably reduced. According to the above alternatives, the springs are difficult to attach when the core is attached, such as when the spring is dropped. Since it is necessary to use tape, not only is it difficult to mount like a spring, but it also has drawbacks such as loss of elasticity during long-term use.

Therefore, the present invention solves the conventional problems, the core is easily attached, the core and the holder are less likely to be damaged, and the cores are pressed against each other to maintain a good noise absorption characteristic. Is to provide.

[0008]

[Means for Solving the Problems]

 The present invention is a noise that is formed in a shape that surrounds an outer peripheral portion of a signal line, and is composed of two magnetic pieces divided in the longitudinal direction of the signal line and a holder having a case portion that accommodates each magnetic piece. In the absorbing device, each of the magnetic material pieces and each of the case portions are fixed by using an adhesive having elasticity after curing, and the core separation prevention structure and the core pressure welding structure are not required. Is.

[0009]

[Action]

 According to the present invention, each magnetic piece is fixed to each case portion of the holder while having an elastic function in a direction perpendicular to the longitudinal direction of the signal line.

[0010]

【Example】

 An external perspective view of a noise absorbing device according to an embodiment of the present invention is shown in FIG.

The core holder having the case portions 21 and 22 is made of an organic insulating material, and is designed so that the longitudinal dimension of the split cores 24 and 24 is slightly smaller than the longitudinal dimension of the case portions 21 and 22. There is. Further, the shape of the split cores 24, 24 is a shape obtained by dividing a hollow cylinder having a hollow portion, which is larger than the diameter of the signal line, in the longitudinal direction of the signal line at the center of the core into two parts. There is no. The core holder is also connected with a hinge 23 at one end thereof so that the case portions 21 and 22 can be opened and closed, and hooked portions 21b and 22b for fixing the case portions 21 and 22 in the closed state are provided at the other end. There are no irregularities, window-shaped notches, tongues, biasing claws, etc.

An appropriate amount of an adhesive made of room temperature curable liquid silicone rubber (manufactured by Toshiba Silicone) having a hardness of 30 (JIS A) after curing is poured into the case portions 21 and 22 to cure the surface of the liquid silicone rubber. After confirming the above, the split cores 24, 24 were fitted into each other, left standing at room temperature, and confirmed to be completely cured to manufacture a noise absorbing device.

At this time, the split cores 24, 24 are completely held by the case portions 21, 22 with an adhesive made of cured silicone rubber. Further, although this noise absorbing device was adhered to the signal line, it was confirmed that the split cores 24, 24 sandwiched the signal line inside the holder due to the elasticity of the silicone rubber.

Using the split core and the core holder having the same shape as in the above-described example, the split core was fixed using an adhesive having different hardness after curing. The results are shown in Table 1.

[0015]

[Table 1]

As is clear from Table 1, when the hardness after curing is 35 (JIS A) or less, the core pressure welding condition is good, and the more elastic the adhesive is, the better.

Although the semi-cylindrical split core is used in the embodiment of the present invention, the shape of the core may be a polygonal column shape, and it has elasticity after curing used for bonding the core and the case. The elastic adhesive is not particularly limited as long as it has elasticity and may be rubber-based or foamable.

[0018]

[Effect of the device]

 According to the present invention, since it is possible to manufacture a core and a holder that do not have a complicated shape as in the past, it is difficult for the core to crack or chip, and the holder is not easily damaged. A device can be provided.

[Brief description of drawings]

FIG. 1 is an external perspective view of an open state of a noise absorbing device according to an embodiment of the present invention (FIG. A) and a view of a split core (FIG. B).

FIG. 2 is an external perspective view (FIG. A) showing an example of a conventional noise absorbing device in an open state and a diagram showing a split core (FIG. B).
Is.

[Explanation of symbols]

 21, 22 Case part 21b, 22b Hook part 23 Hinge 24 Split core

Claims (1)

[Scope of utility model registration request] 1. A magnetic recording medium comprising: two magnetic material pieces formed in a shape surrounding an outer peripheral portion of a signal line and divided in a longitudinal direction of the signal line; The noise absorbing device according to claim 1, wherein each of the magnetic material pieces is fixed to the case portion with an adhesive having elasticity after curing.