JPH0619209Y2 - Signal line filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a signal line filter for a flat cable.

[Prior Art] One means for preventing unnecessary noise generated from a signal line cable connecting digital devices is to penetrate a ferrite core into the signal line cable.

Conventionally, a signal line filter for a signal line flat cable has a structure in which a signal line flat cable 2 is folded in two and inserted into a through hole of an annular ferrite core 1 as shown in FIG. As shown in the figure, the signal line flat cable 2 is sandwiched from above and below by a pair of divided ferrite cores 3 each having a shallow shape, but they are butted against each other so as to form a closed magnetic circuit, and the insulating tape 4 is wound and joined.

[Problems to be solved by the invention] When using an annular core, it is troublesome to stabilize the core, and there is a problem that the height dimension becomes high. There is a problem that the winding work of the insulating tape requires skill and the man-hours increase.

Furthermore, if the shape of the ferrite core is weak against external stress, cracks and chips are likely to occur in the core, and
If the surface of the signal line flat cable is distant from the inner surface of the through hole, it causes undesired radiation noise and intrusion noise, and has poor reliability.

Therefore, an object of the present invention is to provide a signal line filter which has high strength against external stress and has a simple structure, which is easy to manufacture and has high reliability.

[Means for Solving the Problems] According to the present invention, in a signal line filter in which a signal line flat cable is inserted into a ferrite core having through-holes of rectangular cross section on both sides, the through-holes face each other. The signal line filter is characterized in that the ridges formed along the length direction of the signal line flat cable are provided at positions corresponding to the conductors of the signal line flat cable on the two surfaces.

[Operation] In the present invention, the ferrite core absorbs noise generated in the signal line flat cable. The ridges formed in the through holes of the ferrite core are inserted into the positions corresponding to the conductors of the signal line flat cable, and the signal line flat cables are fixed in the through holes without displacement.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a signal line filter according to an embodiment of the present invention. In FIG. 1, the flat tubular ferrite core 5 has a through-hole having a rectangular cross section, and the through-hole has curved corners, which is slightly larger than the contour of the signal line flat cable 2. It is a dimension.

FIG. 2 is a front sectional view showing the signal line filter of FIG. In FIG. 2, in the central portions of both long side (upper and lower in the figure) wall surfaces of the through-hole of the flat tubular ferrite core 5, concave grooves between conductors on the surface of the signal wire flat cable 2 (joint portion of the constituent thin wires are shown). Plural ridges 6 (three in the figure) corresponding to the groove)
Are staggered. The ridge 6 is formed in the length direction of the signal line flat cable 2, and by fitting the ridge 6 into the groove between the conductors of the signal line flat cable 2, the number of thin wires is smaller than originally ( In the figure, the case of less than 10 and 6 is shown) Signal line flat cable 2
The core 5 is stable and does not shift as it is without folding.
Can be inserted through.

As a result, the signal line filter according to the embodiment of the present invention can be easily configured. In addition, the effect of preventing unnecessary noise can be enhanced.

[Effects of the Invention] As described above, according to the present invention, the characteristics of the signal line flat cable are not impaired, the production is easy and the strength is large, and even if the pitch between the cables is slightly deviated, Since the ridges formed along the length direction of the signal line flat cable are provided in the through-holes of the core, there is little variation in characteristics by easily fitting this cable. It is possible to provide a highly reliable signal line filter having an increased area and improved noise absorption characteristics.

Further, according to the present invention, when mounted inside an electronic device,
The mounting space, especially the height, can be kept low, and it is effective as a component to prevent unwanted radiation noise and intrusion in thin electronic devices.

Further, according to the present invention, it is possible to prevent the positional deviation in the transverse direction of the signal line flat cable due to the ridge, and to prevent damage to the cable coating due to rubbing with the ferrite core.

Further, according to the present invention, the ridges extending in the length direction of the signal line cable allow the ferrite core to be mounted on the cable in a well-balanced manner and to increase the contact area with the cable, thereby increasing the cable length of the ferrite core. It is possible to prevent movement in the direction, displacement, or dropping of the ferrite core.

[Brief description of drawings]

1 is an external perspective view showing a signal line filter according to an embodiment of the present invention, FIG. 2 is a front sectional view of the signal line filter of FIG. 1, and FIGS. 3 and 4 are conventional signal line filters. FIG. In the figure, 1: annular ferrite core, 2: signal line flat cable, 3: split ferrite core, 5: flat tubular ferrite core, 6: ridge.

Continuation of the front page (56) References Open 57-85756 (JP, U) Open 56-160023 (JP, U) Open 57-48683 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A signal line filter in which a signal line flat cable is inserted through a ferrite core having through-holes of which both sides of a rectangular section are arcuate, and a conductor of the signal line flat cable on two surfaces of the through-hole facing each other. A signal line filter, characterized in that a ridge formed along the length direction of the signal line flat cable is provided at a position corresponding to the space.