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Basic Audio is a free introductory textbook to the basics of audio physics and electronics. The second type of shielding uses a different principle, but is also effective against magnetic fields. Outside the shield, the two fields are in the same direction and the combined magnetic field is increased. With input transformers, which are particularly susceptible to magnetic fields because they have a magnetic core, the shielding often consists of an arrangement combining magnetic and electromagnetic shielding into one composite assembly. Electromagnetic shielding does not use a magnetic material, but rather one that conducts electric current well, such as copper or aluminum. As well as providing increased protection, the combination makes the arrangement more effective over the entire frequency range.
A tubular braided wire has a second length which is shorter than the first length and a second diameter which is larger than the first diameter. The manufacturing method as set forth in claim 1, wherein the second length and the second diameter are determined such that the diameter of the reduced-diameter portion becomes substantially equal to the first diameter when the braided wire is stretched. The electromagnetic shielding structure as set forth in claim 3, wherein the retainer includes a tube member which is spirally wound on the reduced-diameter portion.
The electromagnetic shielding structure as set forth in claim 3, wherein the retainer includes a pair of clip members which grips both end portions of the reduced-diameter portion. The electromagnetic shielding structure as set forth in claim 5, wherein the clip members are connected by a rod member extending along the reduced-diameter portion. 4, a braided wire 14, formed by interweaving electrically-conductive metal wire elements into a tubular shape, is fitted on a bundle of wires 10 to cover the same, and this braided wire 14 is connected to a tubular metal shell 15 serving as a conductive shielding terminal, and the metal shell 15 is connected at its flange 15a to a mounting member, such for example as an outer casing B of a motor, by bolts 16. When the magnetic field causing the induction fluctuates, it causes current to flow in the shield. Because it depends on fluctuating fields, this kind of shield is completely ineffective against steady magnetism. The magnetic shielding takes care of frequencies down to zero or d-c and begins to become ineffective at frequencies between 60 to 300 cycles. The bundle of electric wires is passed through the braided wire, and then a connector is connected to each of both ends of the electric wires collectively.


A distal end portion 14a of the braided wire 14 is press-fitted with an outer surface of the metal shell 15 over an entire periphery thereof by a fixing band 17 fastened by pressing to the distal end portion 14a. This current in the shield sets up its own magnetic field that opposes the original inducing magnetism, and the two fields tend to cancel inside the shield. It is also comparatively ineffective against low-frequency fluctuation, and only becomes really effective at higher frequencies. The electromagnetic shield^on the other hand, begins to become effective between 60 and 300 cycles, and the combined protection is effective for all frequencies. The braided wire is stretched such that both ends thereof are fixed on the respective connectors to form a reduced-diameter portion therebetween which is fitted on an outer periphery of the bundle of the electric wire.
A conductive retainer is attached on the reduced-diameter portion to maintain a length and a diameter of the reduced-diameter portion. 4, has the following problems.In the manufacturing process, the long wires 10 are passed through the braided wire 14, and in this case the tubular braided wire 14, having a sufficiently large outer diameter, is used so that the insertion can be easily effected so as to enhance the efficiency of the operation. And besides, the non conductive portion of the braided wire relative to the electric wires hardly occurs, and the braided wire can absorb electromagnetic waves, generated from the wires, thereby achieving the satisfactory electromagnetic shielding performance. 1 is a side view showing an electromagnetic shielding structure according to a first embodiment of the invention;FIG. 2 is a side view of the electromagnetic shielding structure of the first embodiment, showing a condition that a spiral tube is wound on the elongated braided wire;FIG.
3A is a side view of an electromagnetic shielding structure according to a second embodiment of the invention;FIG. 3B is a side view of an electromagnetic shielding structure according to a third embodiment of the invention; andFIG. In this case, each wire 1 comprises a conductor 1a (such as a copper wire), and an insulating member 1b formed by extrusion on this conductor to cover it. The insulating member 1b is removed from each end portion of the wire, and a metal terminal 2, such as an LA terminal, is fastened to the exposed end portion of the conductor 1a by crimping its press-fastening portion 2a. An electric connector 3 is connected to the terminals fastened respectively to one ends of the wires 1, while an electric connector 4 are connected to the terminals fastened respectively to the other ends of the wires 1.
The braided wire 5 of either type has such flexibility and stretchability that it can be stretched or elongated in its longitudinal direction.Therefore, there is prepared the braided wire 5 having a length L2 which is much smaller than a length L1 of the wires 1 to be installed.


The inner diameter of the tubular braided wire 5 is larger than the thickness of the bundle of (three) wires 1, and therefore the operation for passing the three wires 1 either one by one or at one time through the braided wire 5 can be smoothly carried out without any difficulty.After the wires 1 are passed through the braided wire 5, and are set in a predetermined condition, the electric connectors 3 and 4 are connected respectively to the opposite ends of the braided wire 5, as shown in FIG. One of the two connectors 3 and 4 is held against movement, and in this condition a pulling force is applied to the other electric connector, thereby stretching the braided wire 5 (having the original length L2) into a length substantially equal to the length L, of the wires 1. In this manner, the braided wire 5 is elongated to form a reduced-diameter portion 5b, having a length L3 and an outer diameter d, between its opposite end portions 5a which remain intact, and hence have the original inner diameter D.
The reduced-diameter portion 5b is elongated into such a diameter that its inner peripheral surface is held in intimate contact or in contact with the three wires 1.In order to maintain the length L3 and the outer diameter d of the elongated, reduced-diameter portion 5b, a spiral tube 6 is mounted on the reduced-diameter portion 5b over the entire length thereof, the spiral tube 6 comprising an electrically-conductive wire rod (such as a wire) or an electrically-conductive tape spirally wound on the outer peripheral surface of the reduced-diameter portion 5b. Thus, the predetermined length L3 and outer diameter d of the reduced-diameter portion 5b can be maintained. Namely, by elongating the braided wire 5 having the original small length L2, its length can be made substantially equal to the length L1 of the wires 1 of different kinds, and therefore the material cost for the braided wire can be reduced. And besides, the inner peripheral surface of the reduced-diameter portion 5b of the elongated braided wire 5 is held in contact with the three wires 1, and therefore the occurrence of the non-conductive portion can be avoided, so that the satisfactory electromagnetic shielding performance can be obtained. Furthermore, the three wires 1 are held by the reduced-diameter portion 5b fitted on these wires, and therefore the wires 1 will not rub together, and the durability of the insulating covering members of the wires 1 against wear is enhanced.Instead of the spiral tube 6, according to a second embodiment of the invention, there can be used clips 7 shown in FIG.
In this case, each clip of a tubular shape is formed from conductive metal or plastics material, and part of this tubular body is notched or removed to form a slit 7a, and by expanding their slits 7a, the clips are mounted respectively on the opposite end portions of the reduced-diameter portion 5b of the braided wire 5, so that the clips grip the reduced-diameter portion 5b by their resilient force, thereby fixing the reduced-diameter portion 5b to the wires 1.According to a third embodiment of the invention, the spiral tube 6 can be replaced by a conductive support rod 8 as shown in FIG.
This support rod 8 includes a connecting bar 8a having a length generally equal to the length L3 (see FIG. 2) of the reduced-diameter portion 5b, and this connecting bar 8a is made of metal or a plastics material having sufficient stiffness that it will not be accidentally deformed.
Clip portions 8b, each having a slit 8c and having the same function as that of the clip 7 of FIG. Therefore, when the clip portions 8b, formed respectively at the opposite ends of the connecting bar 8a, are mounted on the reduced-diameter portion 5b, the connecting bar 8a extends straight, thereby keeping the reduced-diameter portion 5b in its elongated condition in which the length L3 and outer diameter d of this tubular reduced-diameter portion 5b are maintained.Although the specific examples of shape retention member have been shown, the shape retention member is not limited to these examples, and any other suitable member can be used in so far as its shape and function can satisfy the technical concept of the invention.



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