JPH11346072A - Cable-fixing member and its mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs required for suppressing noise, by incorporating a noise filter into a cable-fixing member for fixing the middle part of a cable where one end part is connected to a printed-circuit board to the case of electronic equipment. SOLUTION: A cable-fixing member 7 for fixing the middle part of a power cord 8 to the case of a monitor used for a personal computer is formed by a highly elastic synthetic resin material, and is called a cord clamper for fixing the middle part of the power cord 8 to a cabinet. The cable-fixing member 7 supports the front end part of the power cord 8, and at the same time is mounted to a mounting hole 5a formed on a rear wall 5 of a monitor while a noise filter 13 is incorporated. Then, the front end part of the power cord 8 is connected to the connector part of a printed-circuit board 6 while the cable- fixing member 7 is mounted to the mounting hole 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cable fixing member and a mounting structure thereof. More specifically, the present invention relates to a technique for reducing the cost required for suppressing noise.

[0002]

2. Description of the Related Art In an electronic apparatus such as a monitor or a television used for a personal computer, an intermediate portion of a power cord is usually fixed to a predetermined position of a housing by a so-called code clamper, and one end of the power cord is connected. It is connected to the connector of the printed circuit board arranged in the housing.

On the other hand, in an electronic device such as a monitor, a noise filter for removing noise generated from each circuit of a printed circuit board is provided at a predetermined position on the printed circuit board to reduce noise. .

[0004]

However, in a conventional electronic device, as described above, a noise filter is provided on a printed circuit board on which each circuit serving as a noise source is formed. And the distance between each circuit and each circuit are short, the amount of noise jumping into the noise filter and the amount of jumping into the power cord located in the housing are large, and the noise removing effect is insufficient as a whole.

Therefore, when a noise filter is provided on a printed circuit board as described above, it is necessary to increase the number of components constituting the noise filter or increase the number of components to improve the noise removing effect. Therefore, there have been problems such as an increase in cost for suppressing noise and an increase in the size of electronic equipment due to an increase in a space for disposing a noise filter.

Therefore, it is conceivable to improve the noise removing effect by incorporating a noise filter into a plug provided at the other end of the power cord. In this case, however, the plug becomes large and the plug becomes large when plugging into and unplugging from the outlet. However, there is a problem that it is difficult to use, and the usability is deteriorated.

Therefore, it is an object of the present invention to overcome the above-mentioned problems and reduce the cost required for suppressing noise.

[0008]

According to the present invention, there is provided a cable fixing member for fixing an intermediate portion of a cable having one end connected to a printed circuit board to a housing of an electronic device. The fixed member has a built-in noise filter for absorbing noise generated from the electronic device.

Further, in the mounting structure of the cable fixing member of the present invention, a mounting hole is formed in a housing of an electronic device, and a cable fixing member having a built-in noise filter for absorbing noise generated inside the electronic device is mounted in the mounting hole. It is designed to be attached.

Therefore, in the cable fixing member and the mounting structure of the present invention, it is not necessary to provide a noise filter on the printed circuit board.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a cable fixing member according to an embodiment of the present invention.

In the embodiments described below, the present invention is applied to a cable fixing member for fixing an intermediate portion of a power cord to a housing of a monitor used in a personal computer and a mounting structure thereof.

The cabinet 2 of the monitor 1 is formed in a box shape opened forward. The cabinet 2 includes an upper portion 3 opened forward and downward, and a lower cover 4 covering an opening below the upper portion 3 (see FIG. 1). The lower cover 4 is coupled to the upper portion 3 with its rear surface and side surfaces abutting on the inner surface of the lower end of the rear wall 5 of the upper portion 3.

At a position near the lower end of the back wall 5 of the upper part 3, a rectangular mounting hole 5a is formed (see FIGS. 1 and 4).

A printed circuit board 6 is disposed on the lower cover 4 except for the rear end (see FIG. 1).

The cable fixing member 7 is formed of a synthetic resin material having high elasticity, and is called a so-called cord clamper for fixing an intermediate portion of the power cord 8 to the cabinet 2, and includes a front side portion 9 and a rear side portion. 10 and the attached portion 11 are integrally formed (see FIGS. 1, 3 and 4).

The front part 9 and the rear part 10 have a rectangular parallelepiped outer shape and are formed in the same size. The length of the attached portion 11 is the same as the thickness of the rear wall 5 in the front-rear direction, and the outer shape of the front surface and the rear surface is formed in a rectangular shape slightly smaller than the rear surface of the front side portion 9 and the front surface of the rear side portion 10, respectively. ,And,
It is formed in the same size as the mounting hole 5a of the rear wall 5.
The attached portion 11 is located between the front side portion 9 and the rear side portion 10, and the front and rear surfaces thereof have a portion excluding the peripheral portion of the rear surface of the front side portion 9 and the peripheral portion of the front surface of the rear side portion 10. It is continued to the part except. Therefore, the cable fixing member 7
A mounting groove 12 is formed between the front side 9 and the rear side 10.

In the cable fixing member 7, a portion near the front end of the power cord 8 includes a central portion on the front surface of the front side portion 9 and a rear side portion 1.
0 and is fixed in a state of penetrating between the central portion of the rear surface.

The cable fixing member 7 has a built-in noise filter 13 (see FIGS. 4 and 5). The noise filter 13 is inserted in a portion of the power cord 8 fixed in the cable fixing member 7, and is configured as an electric circuit.

The noise filter 13 includes two common mode choke coils 13a, 13a, an across-the-line capacitor 13b, and two bypass capacitors 13c, 1c.
3c and a fuse 13d. still,
The noise filter only needs to exhibit a noise removing effect, and is not limited to the circuit configuration illustrated as the noise filter 13.

The cable fixing member 7 is, as described above,
The power cord 8 is attached to a mounting hole 5a formed in the rear wall 5 of the monitor 1 while supporting the front end of the power cord 8 and incorporating the noise filter 13 (see FIGS. 1, 2 and 4). The front end of the power cord 8 is connected to a connector (not shown) of the printed circuit board 6 with the cable fixing member 7 attached to the attachment hole 5a.

When the cable fixing member 7 is attached to the mounting hole 5a, the cable fixing member 7 is deformed by inserting the cable fixing member 7 with a large force from the front or the rear of the mounting hole 5a by using its elastic force. The front portion 9 or the rear side portion 10 that has been deformed when the mounted portion 11 is inserted into the position corresponding to 5a returns to the original state, and the mounted portion 11 is fitted in the mounting hole 5a. (See FIGS. 1 and 4).

The connection of the power cord 8 to the connector of the printed circuit board 6 may be performed by providing a connector at the front end of the power cord 8 and attaching the connector to the connector of the printed board 6. Alternatively, it may be performed by peeling off the insulator covering the electric wire at the front end of the power cord 8 and fixing the electric wire by soldering or the like.

As described above, in the above-described embodiment, the noise filter 13 that absorbs noise generated inside the monitor 1 is built in the cable fixing member 7 attached to the cabinet 2 of the monitor 1. ing.

Therefore, since the noise filter 13 is not provided on the printed circuit board 6, the distance from the printed circuit board 6 to the noise filter 13 is larger than when the noise filter 13 is provided on the printed circuit board 6, and the noise filter 13 is not provided. Since the amount of noise jumping into the monitor 1 and the amount of noise jumping into the power cord 8 located in the cabinet 2 are small, the effect of removing noise generated inside the monitor 1 is enhanced, and the elements constituting the noise filter 13 are increased. It is not necessary to increase the number of components or components, and the cost required for suppressing noise can be reduced.

Further, since the cable fixing member 7 having the built-in noise filter 13 is mounted in the mounting hole 5a of the cabinet 2, noise can be removed at the outlet of the power cord 8 from the cabinet 2, and the noise can be reduced within the monitor 2. The generated noise can be completely removed.

In the cable fixing member 7 described above,
The built-in noise filter 13 may be covered by, for example, a metal shield. If the noise filter 13 is covered with a shield, the noise removing effect can be further enhanced.

When a noise filter is provided on a printed circuit board as in the prior art, since the noise filter is arranged on the printed circuit board, the noise filter can only be covered from above by a shield. However, the noise filter cannot be covered with a shield from below.

However, when the noise filter 13 is built in the cable fixing member 7 as described above, it is possible to cover the noise filter 13 from around. Therefore, when the noise filter is built in the cable fixing member 7 as described above, if the noise filter is covered with a shield from around the noise filter, the noise removing effect can be further enhanced.

[0030]

As is apparent from the above description, the cable fixing member of the present invention can be used to connect the middle part of a cable having one end connected to a printed circuit board arranged inside an electronic device to the housing of the electronic device. And a noise filter that absorbs noise generated inside the electronic device in the cable fixing member.

Therefore, the distance from the printed circuit board to the noise filter is increased, the effect of removing noise generated inside the electronic device is enhanced, and it is not necessary to increase the number of components constituting the noise filter or increase the number of components.
The cost required for suppressing noise can be reduced.

According to the second aspect of the present invention, since the shield for covering the noise filter is provided inside the cable fixing member, the noise removing effect can be further enhanced.

Further, the cable fixing member mounting structure of the present invention is a cable fixing member for fixing an intermediate portion of a cable having one end connected to a printed circuit board arranged inside an electronic device to a housing of the electronic device. Wherein a mounting hole is formed in the housing, and a cable fixing member having a built-in noise filter for absorbing noise generated inside the electronic device is mounted in the mounting hole.

Accordingly, noise can be removed at the exit of the cable from the housing, and noise generated in the electronic device can be completely removed.

According to the fourth aspect of the present invention, since the shield for covering the noise filter is provided inside the cable fixing member, the noise removing effect can be further enhanced.

It should be noted that the specific shapes and structures of the respective parts shown in the above-described embodiment are merely examples of the embodiment when practicing the present invention.
These should not be construed as limiting the technical scope of the present invention.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a cable fixing member and an attachment structure thereof according to the present invention together with FIGS. 2 to 5; It is a schematic side view.

FIG. 2 is a schematic rear view of the monitor.

FIG. 3 is a schematic enlarged perspective view of a cable fixing member.

FIG. 4 is a schematic enlarged plan view partially showing a cross section of a state in which the cable fixing member is attached to the attachment hole.

FIG. 5 is a circuit diagram illustrating a configuration example of a noise filter.

[Explanation of symbols]

1 ... monitor (electronic device), 2 ... cabinet (housing),
5a: mounting hole, 6: printed circuit board, 7: cable fixing member, 8: power cord (cable), 13: noise filter

Claims (4)

[Claims] 1. A cable fixing member for fixing an intermediate portion of a cable having one end connected to a printed circuit board arranged inside an electronic device to a housing of the electronic device, wherein the cable fixing member includes an electronic device. A cable fixing member having a built-in noise filter that absorbs noise generated inside the cable. 2. The apparatus according to claim 1, wherein a shield for covering the noise filter is provided inside the cable fixing member.
2. The cable fixing member according to 1. 3. A mounting structure of a cable fixing member for fixing an intermediate portion of a cable, one end of which is connected to a printed circuit board disposed inside an electronic device, to a housing of the electronic device. A mounting structure for a cable fixing member, wherein a mounting hole is formed, and a cable fixing member having a built-in noise filter for absorbing noise generated inside an electronic device is mounted in the mounting hole. 4. The cable fixing member according to claim 3, wherein a shield for covering the noise filter is provided inside the cable fixing member.
3. A mounting structure for a cable fixing member according to 1.