JPH0732999U - Ferrite block fastening structure for noise suppression - Google Patents

Abstract

(57) [Summary] [Purpose] Various electronic devices, such as CPs for personal computers
A noise countermeasure that prevents unnecessary electromagnetic waves from being emitted into the air from a flat cable that connects U and peripheral devices and gives noise to other electronic devices, or prevents the electronic cables from other electronic devices receiving electromagnetic waves and causing noise. The ferrite block for use can be easily attached to the flat cable. [Structure] When inserting the flat cable 1 into a ferrite block 6 formed in a rectangular frame shape and fixing the ferrite block 6 to the flat cable 1, two parallel winding portions 7a and 7b and An adhesive film piece 7 that is cut into an H shape and is composed of a bridge portion 7c connecting the winding portions 7a and 7b is formed, and the bridge portion 7c is covered on the ferrite block 6 to form the winding portions 7a and 7b. Are wound around the flat cable 1 on both sides of the ferrite block 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, useless electromagnetic waves are emitted into the air from various electronic devices, for example, a flat cable connecting a CPU of a personal computer main body and peripheral devices to give noise to other electronic devices, or other electronic devices generate flat noise. It relates to a structure for fastening ferrite blocks for noise prevention to prevent the cables from receiving electromagnetic waves and generating noise.

[0002]

[Prior art]

 In a game machine such as a pachinko machine, a control board provided with a CPU for game control and a display section provided with an electronic display such as a liquid crystal display are electrically connected to each other by a flat cable on the back side of the game machine. They are joined together and send and receive signals. As is well known, this flat cable is made up of multiple conductors arranged in parallel in an insulating coating such as vinyl chloride, and is useful for transmitting many sensitive electrical signals such as pulse signals in parallel. Widely used.

However, in general, the signal cable as described above is susceptible to noise due to induction of electromagnetic waves emitted from the electronic devices and the like in the vicinity thereof, which may cause malfunction, or may generate electromagnetic waves by itself to cause noise disturbance in the surroundings. May be given.

In the case of a flat cable as a countermeasure against such noise, conventionally, a ferrite bead having a high magnetic permeability is used to enclose the periphery of the flat cable with resin, or a flat block is sandwiched between ferrite blocks to surround the periphery of the flat cable. It was wrapped in a resin case and fixed.

[0005]

[Problems to be solved by the device]

 However, the method of surrounding the ferrite material with the synthetic resin as described above has a problem that it is not suitable for small-quantity production because an expensive mold is required for resin molding.

[0006]

[Means for Solving the Problems]

 The noise block ferrite block fastening structure of the present invention is intended to solve the above problems. A flat cable is inserted into a rectangular frame-shaped ferrite block, and the ferrite block is fastened to the flat cable. In doing so, an adhesive film piece cut into an H shape, which consists of two parallel winding portions and a bridge portion connecting the winding portions, is formed, and the bridge portion is covered on the ferrite block. The characteristic is that the winding portion is wound around the flat cable on both sides of the ferrite block.

[0007]

[Action]

 Even if the width of the flat cable or the size of the ferrite block is slightly different, the same size adhesive film piece can be used for secure attachment. Therefore, the installation cost for low-volume production is reduced.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3, 1 is a flexible flat cable in which 26 conductors 2 are embedded in a vinyl chloride coating 3 in parallel, 4 and 5 are connectors provided at both ends of the flat cable 1, Reference numeral 6 is a rectangular frame-shaped ferrite block in which the flat cable 1 is inserted at the center.

As shown in FIG. 4, 7 cuts an adhesive film having a back surface coated with an adhesive to form winding portions 7 a and 7 b which are spaced apart from each other by a predetermined distance in parallel, and A bridge portion 7c that connects the attachment portions 7a and 7b is formed, and is an H-shaped adhesive film piece.

When the ferrite block 6 is fixed to the flat cable 1 at a predetermined position, the bridge portion 7c of the adhesive film piece 7 is adhered to the upper surface and both side surfaces of the ferrite block 6 to cover it. The winding portions 7a and 7b are wound around the flat cable 1 on both sides of the ferrite block 6. It is desirable in terms of strength that the lengths of the winding portions 7a and 7b be such that the outer circumference of the flat cable 1 can be wound more than once. Further, it is preferable that the bridging portion 7c has a length with a margin with respect to the width of the ferrite block 6 so as to surround the ferrite block 6.

In this way, the bridging portion 7c and the winding portions 7a and 7b are adhered to the ferrite block 6 and the flat cable 1 by the adhesive on the back surface thereof, respectively, so that the adhesive film piece 7 is not wrinkled and the ferrite block 7 is not wrinkled. 6 can be fixedly and firmly fixed to the flat cable 1.

The material of the adhesive film may be any of acrylic film, cellophane film, vinyl film, paper, cloth, etc., but if a metal film such as aluminum foil which itself has magnetic permeability is used, The dielectric shield effect can be further improved.

Further, the form of the adhesive film piece 7 is not limited to the H-shaped one as shown in FIG. 4, but a wound part 7a such as a form having two bridging parts 7c as shown in FIG. , 7b and the bridge portion 7c are conceivable. Further, the flat cable 1 is not limited to the vinyl chloride-coated cable shown in the drawing, but may be a printed cable.

[0014]

[Effect of device]

 As described above, the fastening structure of the noise-preventing ferrite block according to the present invention allows the ferrite block to be easily fastened to the flat cable by the adhesive film piece, and the width of the flat cable and the size of the ferrite block may be slightly different. Since it can be fastened without any trouble, it is highly flexible and has the beneficial effect that it can be fastened securely at a low cost even for products manufactured in relatively small quantities.

[Submission date] January 17, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3, 1 is a flexible flat cable in which 13 conductors 2 are embedded in a vinyl chloride coating 3 in parallel, 4 and 5 are connectors provided at both ends of the flat cable 1, Reference numeral 6 is a rectangular frame-shaped ferrite block in which the flat cable 1 is inserted at the center.

[Brief description of drawings]

FIG. 1 is a perspective view of a flat cable showing an embodiment of a noise block ferrite block fastening structure according to the present invention.

FIG. 2 is a vertical cross-sectional view of the main part of FIG.

FIG. 3 is a cross-sectional view of the main part of FIG.

FIG. 4 is a perspective view of an adhesive film piece.

FIG. 5 is a perspective view showing another embodiment of the adhesive film piece.

[Explanation of symbols]

 1 Flat cable 6 Ferrite block 7 Adhesive film piece 7a, 7b Winding part 7c Bridge part

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[Procedure amendment]

[Submission date] January 17, 1994

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (1)

[Scope of utility model registration request] 1. When inserting a flat cable into a ferrite block formed in a rectangular frame shape and fixing the ferrite block to the flat cable, two parallel winding portions and the winding portions are connected to each other. Forming an adhesive film piece cut into an H shape or the like consisting of a bridge section connected to the ferrite block, covering the bridge section on a ferrite block, and winding the winding section on a flat cable on both sides of the ferrite block. A fastening structure of a ferrite block for noise suppression, which is characterized by