JPH062637U - Ferrite core - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a ferrite core for EMI that makes it easy to wind a cable. [Structure] A groove 11 is provided on the outer circumference of a ferrite core 10 so that a cable can be easily and surely wound.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ferrite core used as an electromagnetic wave countermeasure for electronic devices.

[0002]

[Prior art]

 As digital devices flood the world, electromagnetic interference (EMI) has become a major issue throughout society around the world. This is because digital devices are prone to malfunction due to EMI noise. Further, since the digital device itself operates with a square wave containing many harmonic components, the harmonics may generate electromagnetic waves from the digital device and affect other devices. For this reason, regulations are being set for EMI noise emitted from equipment, and the regulation values are becoming stricter day by day.

A cable is one of the portions where radiation noise is likely to occur. The current flowing in the cable generates a magnetic field around it, and a part of the energy of the current is emitted from the magnetic field to the outside as an electromagnetic wave. A ferrite core is used as a countermeasure against this electromagnetic wave. By passing the cable through the ferrite core, the magnetic field that was previously available in the space is collected in the ferrite due to the effect of collecting the magnetic flux of the ferrite, and due to the principle of loss, only unnecessary high-frequency energy is transferred to the magnetic energy to generate heat. Converted to energy. Therefore, after passing through the ferrite core, the radiated EMI noise is attenuated and removed, and the high frequency component of the flowing signal is attenuated, so that the radiated noise from the cable is attenuated.

This effect is then proportional to the number of turns for the ferrite core of the cable squared.

[0005]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, when the cable is wound around the ferrite core in order to improve the effect, particularly when winding a plurality of cables, the position is not fixed or slips, and the winding is not successful. , I often felt inconvenience.

[0006]

[Means (and action) for solving the problem]

 The present invention has been proposed in view of these problems in the prior art, and the purpose thereof is to provide a groove on the outer circumference of a ferrite core so that the cable can be wound easily and securely. It is something that can be attached.

[0007]

【Example】

 Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, and 10 is a ferrite core. A plurality of grooves 11 are provided on the outer circumference of the ferrite core 10.

FIG. 2 shows a usage state. In FIG. 2 (A), when one cable 20 is turned two times, in FIG. 2 (B), four cables 21, 22, 23, 24 are connected. This is the case after two turns. In this case, the positions of the cables 20, 21, 22, 23, and 24 are determined by the groove 11, so that they can be easily wound without slipping.

(Other Embodiments) Here, it goes without saying that a plurality of grooves 12 may be provided on the inner circumference of the ferrite core 10 as shown in FIG.

[0011]

[Effect of device]

 As described above, according to the present invention, the cable can be easily and surely wound around the ferrite core a plurality of times, so that the ferrite core can be expected to have an even greater effect of electromagnetic wave countermeasures.

As described above, the structure is simple, but an extremely large effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a ferrite core according to an embodiment of the present invention.

FIG. 2 is an explanatory view of using a ferrite core according to an embodiment of the present invention.

FIG. 3 is a perspective view of another embodiment according to the present invention.

[Explanation of symbols]

 10 Ferrite core 11 Groove on outer circumference 12 Groove on inner circumference 20, 21, 22, 23, 24 Cable

Claims (1)

[Scope of utility model registration request] 1. A ferrite core characterized in that a groove is provided on the outer circumference.