JPH0983176A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electronic apparatus in which the number of components and an assembling man-hours are small by a method wherein a coupling member is used as an electric connection means for a first metal member and a second metal member instead of a lead wire and a ferrite core is arranged so as to surround the coupling member. SOLUTION: A metal screw 14 is screwed to a frame 11 and a frame 12, and both frames are coupled mechanically and connected electrically. In this state, the screw 14 is used as an electric connection body instead of a lead wire. As a result, a lead wire is not required, and a terminal block is not required. In addition, when the screw 14 is screwed to both frames 11, 12, three kinds of operations, i.e., the mutual coupling and the electrical connection of both frames 11, 12 and the attachment of a ferrite core 13, are finished. As a result, an assembling man-hours can be reduced remarkably as compared with the asembling operation of an electronic apparatus in conventional cases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device, and more particularly to an electronic device having an improved structure in which the number of parts is smaller and the number of assembling steps is smaller than those of the conventional ones.

[0002]

2. Description of the Related Art Harmonic noise generated from a circuit incorporated in an electronic device causes electromagnetic interference (electromagnetic interference) in the surrounding environment.
Magnetic Interference. Below, it is abbreviated as EMI. ) Has attracted attention as a social problem, and in developed countries, EM using electronic devices
Laws and regulations to prevent I have to be established, and electronic devices newly manufactured after that must meet the standards.

There are various types of electronic components mounted on electronic equipment as noise filters or EMI filters, and ferrite beads and ferrite cores are also inductance elements which are mainly used as noise filters for circuits.

FIG. 3 shows an example of a main structure of a conventional electronic device and a usage pattern of a ferrite core as a noise filter in the main structure.

In FIG. 3, reference numerals 1 and 2 denote a frame of an electronic device made of a metal plate-like member, and 3 a hole (not shown) for inserting the lead wire 8 therethrough is provided through the lead wire. A disk-shaped ferrite core (or ferrite bead) in which 8 is inserted, 9 and 10 are crimped or soldered to both ends of the lead wire 8 respectively, and metal screws 6 and 7 are pressed to the frames 1 and 2 respectively. The terminal board is

[0006]

The structure of the conventional electronic device shown in FIG. 3 has the following drawbacks.

When the frames 1 and 2 are to be arranged so as to completely overlap with each other, the positions of the screws 6 and 7 should be set to the extreme positions of the frames 1 and 2 to prevent the lead wire 8 from moving. The length becomes very long, and as a result, not only adverse effects such as an increase in inductance of the lead wire 8 and signal delay occur, but also the lead wire 8
Exists on the frame, the effective use area of the surfaces of the frames 1 and 2 is reduced.

Since a place for fixing the ferrite core 3 must be provided on the frame, the size of the frame becomes large and the electronic device becomes large. Further, since it is necessary to provide a holding member for the ferrite core in order to prevent the ferrite core from being damaged by vibration of the electronic device, manufacturing cost and mounting cost for the holding member are required. When forming the structure of FIG. 3, many man-hours are required. That is, the lead wire 8 is inserted through the center hole of the ferrite core 3, and both ends of the lead wire 8 are connected to the terminal plates 9 and 10.
After fixing the terminal plates 9 and 10 to predetermined positions of the frames 1 and 2, screw them into the frames 1 and 2 through the terminal plates 9 and 10 to hold the ferrite core 3 It requires a total of 6 or more steps of attaching to the frame via members.

Since the lead wire 8, two terminal plates, two screws, a holding member for the ferrite core, and the like are required, the number of necessary parts is large and the manufacturing cost is high.

[0010]

It is an object of the present invention as set forth in claim 1 that the required number of parts and the number of assembling steps are smaller than those of the electronic device having the above-mentioned conventional structure, and the electronic device has an improved structure which can be manufactured at a low cost. Is to provide.

An object of the present invention set forth in claim 2 is to provide an electronic device having a structure in which the ferrite core is not likely to be damaged, in addition to the object of the present invention set forth in claim 1.

[0012]

In order to achieve the above-mentioned object, the invention of claim 1 relates to "a first metal member and a first metal member which are arranged at a predetermined distance from each other. A second metal member to be electrically connected to the first metal member, and a conductive coupling member that couples the first metal member and the second metal member to each other with a predetermined gap therebetween. , And a ferrite core arranged so as to surround the coupling member at a position between the first metal member and the second metal member.

According to the present invention, the connecting member is used as an electrical connecting means for the first and second metal members instead of the lead wire, and the ferrite core is arranged so as to surround the connecting member. An electronic device having a smaller number of parts and a smaller number of assembly steps than the conventional electronic device is provided.

In order to achieve the above-mentioned object, the invention of claim 2 provides, "In an electronic device having the structure of claim 1, the first metal member and the first metal member are provided between the coupling member and the ferrite core. An electronic device, characterized in that spacers made of an insulating material for maintaining a mutual space between the two metal members are arranged.

According to the present invention, the spacer made of an insulating material is disposed between the first and second metal members, whereby it is possible to prevent an excessive external force from acting on the ferrite core.
Therefore, there is provided an electronic device which has the same effect as that of the invention of claim 1 and which does not damage the ferrite core.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

<Embodiment 1> FIG. 1 is a sectional view of a main structure of an electronic apparatus according to a first embodiment of the present invention.

In the figure, 11 and 12 are frames of the electronic equipment of the present embodiment, 13 is a ferrite core as a noise filter, 14 is screwed into the frames 11 and 12, and both frames are mechanically coupled to each other. It is a metal screw, which is electrically connected. In the present embodiment, the screw 14 is used as an electrical connection conductor instead of the lead wire 8 in the conventional structure of FIG. 3, so that the lead wire 8 is unnecessary and the terminal plates 9 and 10 in the conventional structure are also unnecessary. became. Further, since the three types of work of mutual coupling and electrical connection of both frames and attachment of the ferrite core 13 are completed simply by screwing the screws 14 into the both frames 11 and 12, the number of assembling steps is higher than that of the assembling work of the conventional electronic equipment. It can be significantly reduced.

In the structure of FIG. 1, the ferrite core 13 is sandwiched between the two frames 11 and 12.

<Second Embodiment> FIG. 2 shows a second embodiment of the present invention. The present embodiment is a partially modified embodiment of the first embodiment, and in the present embodiment, the first point is that spacers 15 made of an insulating material are arranged between both frames 11 and 12. The structure is different from that of the above embodiment. Therefore, in FIG. 2, the components indicated by the same reference numerals as those in FIG. 1 are the same as the components described in the first embodiment, and therefore the description of the same components will be omitted.

The spacer 15 has a length in the axial direction longer than that of the ferrite core 13. Further, the spacer 15 surrounds the threaded portion of the screw 14, and the end surface of the ferrite core 13 at one end of the tubular portion. And a flange portion arranged so as to cover the.

Since the outer diameter of the tubular portion is smaller than the inner diameter of the ferrite core 13, the tubular portion of the spacer 15 is inserted into the central hole of the ferrite core 13. Further, since the axial length of the spacer 15 is longer than the axial length of the ferrite core 13, even if the screw 14 is screwed in, the pressure of both the frames 11 and 12 acts only on the spacer 15, and the ferrite core 13 receives the force from both frames. No axial pressure is applied.

That is, in the structure of this embodiment, since no external force acts on the ferrite core 13, there is no risk of damage to the ferrite core 13 as compared with the structure of FIG.

[0024]

According to the first aspect of the present invention, the connecting member is used as an electrical connecting means for the first and second metal members instead of the lead wire, and ferrite is used so as to surround the connecting member. Since the core is arranged, an electronic device having a smaller number of parts and fewer assembly steps than the conventional electronic device is provided.

According to the second aspect of the present invention, since the spacer made of the insulating material is arranged between the first and second metal members, it is possible to prevent an excessive external force from being applied to the ferrite core. There is provided an electronic device which has the same effect as that of the invention of claim 1 and which does not damage the ferrite core.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main structure of an electronic device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a main part structure of an electronic device according to a second embodiment of the invention.

FIG. 3 is a cross-sectional view showing a main part structure of a conventional electronic device.

[Explanation of symbols]

1, 2, 11, 12: Frame 3, 13: Ferrite core 6, 7, 14: Screw 8: Lead wire 9, 10: Terminal board 15: Spacer

Claims (2)

[Claims] 1. A first metal member and a second metal member which is arranged at a predetermined distance from the first metal member and which is to be electrically connected to the first metal member. When,
A conductive coupling member that couples the first metal member and the second metal member to each other at a predetermined distance, and the conductive coupling member at a position between the first metal member and the second metal member. An electronic device comprising: a ferrite core arranged so as to surround the coupling member. 2. A spacer made of an insulating material is arranged between the coupling member and the ferrite core for maintaining a mutual distance between the first metal member and the second metal member. The electronic device according to claim 1, which is characterized in that.