KR101056649B1 - coax - Google Patents

Abstract

(Problem) The outer diameter is small and can be used in small spaces, such as the lead wire of the antenna used in the folder-type mobile phone or the interface cable of the display and the main body of the notebook computer, and when the clamshell or notebook computer is used or not used. Therefore, an ultrafine coaxial cable having sufficient flexibility and excellent shielding property for blocking noise even when frequently opening and closing operations are performed is provided.

(Solution means) A coaxial cable formed by covering an insulator around a center conductor, providing a lateral shield layer around the insulator, and providing a sheath around the lateral winding shield layer, wherein the lateral winding shield layer is a shield material. The element wire is wound around the insulator to form the first cross winding shield layer, and the shield material element wire is formed in the same direction as the shield material element wire forming the first cross winding shield layer around the first cross winding shield layer. A double coaxial shield layer formed by winding a second cross winding shield layer, wherein the first cross winding shield layer and the second cross winding shield layer are compressed, and an outer sheath is provided.

Description

Coaxial Cables {COAXIAL CABLE}

1 is a schematic perspective view of a preferred embodiment of a microfine coaxial cable according to the present invention.

FIG. 2 is a cross-sectional view of the ultrafine coaxial cable shown in FIG. 1. FIG.

Fig. 3 is a schematic explanatory diagram of a folding cellular phone in which the ultrafine coaxial cable shown in Fig. 1 is used.

4 is an explanatory diagram of a bending tester used in a flex resistance test of a coaxial cable.

5 is a graph showing the shielding effect of a coaxial cable having an ultrafine coaxial cable and a conventional braided shield layer and a transverse shield layer according to the present invention as an outer conductor layer.

Fig. 6 is a sectional view of a coaxial cable having a conventional braided shield layer as an outer conductor layer.

* Description of the symbols for the main parts of the drawings *

1 center conductor 2 insulator

3 First side winding shield layer 4 Second side winding shield layer

5 double side wound shield layer 6 shell

10 microfine coaxial cable

TECHNICAL FIELD The present invention relates to a coaxial cable, and in particular, an ultra-fine coaxial cable having a very small outer diameter used as a lead wire of an antenna of a clamshell cell phone which frequently opens and closes, or between a main body and a display of a notebook computer subjected to a high frequency open / close operation. The present invention relates to an ultra-fine coaxial cable having a very small outer diameter used for connecting an interface cable.

Background Art [0002] Conventionally, a folding cellular phone as described above includes a receiver having an antenna, a display, and the like, and a transmitter for sending a signal such as an e-mail through a voice signal or an operation key, and the receiver and the receiver are pivotable to the hinge. Mechanically coupled. The hinge portion is provided with a connecting cable for electrically connecting the antenna of the receiver and the signal generating circuit of the transmitter for generating a signal in response to the operation of a voice signal or an operation key. Coaxial cable is used to cut off the In addition, one end of the connection cable provided in the hinge part is fixed to the antenna of the receiver, and the other end is fixed to the signal generator circuit. Thus, this type of folding cellular phone uses the antenna of the receiver in operation. It is configured to transmit a signal from a signal generation circuit or to receive a signal from the outside.

In order to operate such a clamshell cell phone, if the clamshell cell phone is frequently opened or closed in accordance with use or non-use, the connection cable fixed between the antenna and the signal generating circuit is bent or twisted in the hinge part or the like. Will receive.                         

In that case, as an outer conductor layer of a coaxial cable used as a connection cable, a braided shield layer formed by braiding copper wires around the insulator covered by the center conductor, or a transverse winding layer formed by winding copper wires in a transverse winding Although used, coaxial cables having a braided shield layer as an outer conductor layer are excellent in shielding properties to shield noise, but in folding cellular phones which frequently receive opening and closing operations in use or non-use, between an antenna and a signal generating circuit. There is a problem that the fixed coaxial cable is bent or twisted, resulting in lack of flexibility. In addition, the formation of the braided shield layer requires a large amount of time in working time, and there is also a problem in terms of productivity.

On the other hand, in the case where the lateral winding layer is used as the outer conductor layer of the coaxial cable used as the connecting cable, when the clamshell cell phone is frequently opened and closed, the flexibility is superior to that of the braided shield layer. It cannot be said that it is enough in terms of the shield characteristic which cuts off noise.

On the other hand, in order to further improve the shielding property of blocking noise, when the double transverse winding shield layer is formed in which the transverse shield layer is doubled, the winding directions of the copper wires of each layer are different from each other and are wound. The shape is similar to that of the braided shield, which is good in terms of shielding property to block noise, but there is a problem that flexibility is not sufficient. Also in this case, since the winding directions of the copper element wires are wound alternately with each other in forming the transverse winding layer, it takes a lot of time for the working time and there is a problem in terms of productivity (for example, a patent). See Document 1).                         

In addition, in order to further improve the shielding property for blocking noise, a case in which a triple transverse shield layer or more, for example, a triple transverse shield layer is provided, is considered, but in this case, the outer diameter is increased as an ultrafine coaxial cable. There is a problem that the weight is increased and the flexibility is also impaired.

(Patent Document 1)

Japanese Patent Laid-Open No. 6-349345

Accordingly, the present invention has been made in view of the above problems, and an object thereof can be used in a small space having a small outer diameter, such as a lead wire of an antenna used for a folding cell phone or an interface cable of a display and a main body of a notebook computer. The present invention provides an ultra-fine coaxial cable having sufficient flexibility and shielding noise and excellent shielding performance even when frequently opening and closing operations are performed in accordance with the use of a folding cell phone or a notebook computer.

The above object is achieved by an ultrafine coaxial cable according to the present invention. In other words, in the present invention, in the coaxial cable formed by covering an insulator around the center conductor, providing a lateral winding shield layer around the insulator, and providing an outer sheath around the lateral winding shield layer, the lateral winding shield is used. The layer is wound around the insulator to form the first transverse winding shield layer, and then, in the same direction as the shielding material element wire forming the first transverse winding shield layer around the first transverse winding shield layer. It is a double transverse shield layer formed by winding a shield material element wire to form a second transverse shield layer, and an outer skin is provided after compressing the first transverse shield layer and the second transverse shield layer. .

According to the ultra-fine coaxial cable of the present invention, in the coaxial cable formed by covering an insulator around the center conductor, providing a lateral winding shield layer around the insulator, and providing an outer sheath around the lateral winding shield layer. The shield layer winds the shield material element wire around the insulator to form a first transverse winding shield layer, and also has the same direction as the shield material element wire forming the first transverse shield layer around the first transverse winding shield layer. It is a double transverse shield layer formed by winding a shield material element to form a second transverse shield layer, and after the first transverse shield layer and the second transverse shield layer are compressed, an outer skin is provided. In addition to the flexibility and flexibility required for connection cables of clamshell phones or laptop computers that frequently open and close, the shielding effect is desired. There was enough to satisfy the above.

EMBODIMENT OF THE INVENTION Hereinafter, the micro coaxial cable which concerns on this invention is demonstrated with reference to attached drawing about preferable embodiment.

1 is a schematic perspective view of a preferred embodiment of a micro coaxial cable according to the present invention, FIG. 2 is a cross-sectional view of a micro coaxial cable shown in FIG. 1, and FIG. 3 is a folding type cellular phone in which a micro coaxial cable shown in FIG. 1 is used. Fig. 4 is an explanatory diagram of a bending tester for use in the flex resistance test of a coaxial cable, and Fig. 5 has an ultrafine coaxial cable according to the present invention, a conventional braided shield layer, and a transverse shield layer as an outer conductor layer. It is a graph which shows the shield effect of a coaxial cable, and FIG. 6 is sectional drawing of the coaxial cable which has the conventional braided shield layer as an outer conductor layer. It is to be understood that the drawings are only used to describe preferred embodiments of the present invention, and the scale of each part is not considered.

1 and 2, an ultrafine coaxial cable 10 according to the present invention is shown, and this ultrafine coaxial cable 10 is formed of, for example, a copper alloy wire containing silver plated tin having an outer diameter of about 50 µm. The insulator 2 of the tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA) is covered with a thickness of about 45 µm around the core conductor 1 formed by twisting, and the insulator 2 is The first transverse winding shield layer 3 formed by winding spiral copper wires containing tin-plated tin of a plurality of outer diameters of about 50 탆 (28 in the present embodiment) as a shielding wire for the outer conductor. Equipped with.

In the circumference of the first transverse winding shield layer 3, a copper alloy wire containing tin-plated tin having a large number of outer conductors of about 50 µm (34 in this embodiment) as the shield material element wire for the outer conductor is similarly used. A second transverse winding shield layer 4 formed by winding in a spiral shape is provided. The double horizontal winding shield layer 5 is formed of these 1st horizontal winding shield layer 3 and the 2nd horizontal winding shield layer 4. In this way, the first transverse winding shield layer 3 and the second transverse winding shield layer 4 formed around the insulator 2 covered by the center conductor 1 are compressed with a die (not shown). As a result, between the shield material element wires in the double transverse shield layer 5 becomes airtight.

The outer sheath 6 of the coaxial cable 10 is then covered with PFA as the sheath around the first transverse sheath layer 3 and the second transverse sheath shield layer 4, ie, the compressed double transverse sheath layer. To form. The ultrafine coaxial cable 10 thus formed is provided in, for example, the foldable cellular phone 30 shown in FIG.

The cellular phone 30 shown in FIG. 3 includes a handset 33 having an antenna 31, a display 32, and the like, and a talker 34 for sending a signal such as a mail through a voice signal or an operation key. The receiving section 33 and the sending section 34 are rotatably mechanically coupled to each other by the hinge section 35. In addition, the transmitter 34 is provided with a signal generating circuit 36 mounted on a printed board for generating a signal in response to an operation of an audio signal or an operation key.

An ultrafine coaxial cable of the present invention is a connection cable for connecting the antenna 31 of the receiver 33 in the cellular phone 30 and the signal generator circuit 36 of the transmitter 34 for generating a signal. In order to install 10, one end of the coaxial cable 10 arranged to pass through the hinge part 35 is fixed to the antenna 31 of the receiver 33, and the other end thereof is connected to the signal generating circuit 36. Fix it on the In this way, the folding cellular phone 30 can transmit a signal from the signal generating circuit 36 or receive a signal from the outside through the antenna 31 of the receiver 33 at the time of operation after power-on. It is configured to be.

In this way, the flex resistance of the ultrafine coaxial cable 10 of the present invention, which is provided as a lead cable of an antenna, in the folding cellular phone 30, is shown in FIGS. 4A and 4B. Investigation was carried out using the bending tester 40.

That is, one end side of the micro coaxial cable 10 of the present invention is fixed to the upper end side 41 of the left and right bend tester 40, and the other end side thereof has a bent portion 43 having a pair of mandrels 42 separated from each other. In addition to passing between the core rods 42), the load (w) (127gf) is suspended at the lower end thereof, and in this state, when the bent portion 43 is bent at a bending angle of 90 degrees left and right, the ultrafine coaxial of the present invention The cable 10 is bent from side to side by the mandrel 42. In this way, the bending test of the ultrafine coaxial cable 10 of this invention was done (bending radius 7.5 mm). In this bending resistance test, the number of times that the inner conductor or the outer conductor was not conducted was determined.

As Comparative Example 1, the outer conductor of the coaxial cable, which is the connecting cable, was a braided shield structure having an index of 6 and a stroke of 8, using a copper alloy wire containing tin plated tin having an outer diameter of about 50 µm. Similarly to the configuration of the coaxial cable 10, a coaxial cable was produced.

Next, as Comparative Example 2, a transverse wound shield structure formed by winding the outer conductor of the coaxial cable, which is a connecting cable, in a spiral manner using a copper alloy wire containing a plurality of (28) tin-plated tins having an outer diameter of about 50 µm. The other structure produced the same coaxial cable similarly to the structure of the coaxial cable 10 of this invention.

Table 1 shows the results of examining the flex resistance of the coaxial cable of the present invention and the coaxial cables of Comparative Examples 1 and 2 by the above-described method.                     

As can be understood from Table 1, it can be seen that a coaxial cable having an outer conductor of the present invention has a bending life of about 1.5 times that of a coaxial cable having a conventional braided structure as an outer conductor.

Moreover, the result of having examined the shielding effect of the coaxial cable of this invention and the coaxial cable of the comparative example 1 and the comparative example 2 is shown in FIG. A is a coaxial cable having a braided shield structure as an outer conductor of Comparative Example 1, B is a coaxial cable having an outer conductor of the present invention, and C is a shielding effect of a coaxial cable having a transverse shield structure as an outer conductor of Comparative Example 2. Each is shown.

In addition, the measurement of the shielding effect is CISPR Pub. It carried out by the absorption clamping method based on 16 provisions.

As can be seen from Table 1 and Fig. 5, although the shielding effect (A) of the coaxial cable of Comparative Example 1 is excellent, the flexibility and flexibility are not sufficient, and the coaxial cable of Comparative Example 2 is flexible and flexible. This is slightly superior, but the shielding effect (C) is insufficient. On the other hand, the coaxial cable of the present invention is flexible and flexible required for a folding cell phone or a notebook computer without any of the flexibility, flexibility, or shielding effects in Comparative Examples 1 and 2 being biased in an excellent direction. It fully satisfies the castle and shielding effects in a desired range.

As described above, according to the ultrafine coaxial of the present invention, a coaxial cable is formed by covering an insulator around the center conductor, providing a transverse shield layer around the insulator, and providing an outer sheath around the transverse shield layer. A shielding material according to claim 1, wherein the transverse winding layer is formed by winding a shield material element wire around the insulator to form a first transverse winding layer, and further, forming the main one transverse winding shield layer around the first transverse winding layer. It is a double transverse shield layer formed by winding a shield material element wire in the same direction as the element wire to form a second transverse shield layer, and after the first transverse shield layer and the second transverse shield layer are compressed, an outer shell is provided. Because we configured micro coaxial cable to use, interface of notebook computer or connection cable of clamshell cell phone which frequently opens and closes depending on use or non-use The shielding effect in addition gender bending, is not required or the like table shows the effect sikindaneun satisfy the desired range.

Claims (1)

In a coaxial cable formed by covering an insulator around a center conductor, forming a transverse shield layer around the insulator, and forming an outer sheath around the transverse shield layer, wherein the transverse shield layer is a shield material element wire. Wound around the to form a first transverse winding shield layer, and around the first transverse winding shield layer, the shielding material element wire is wound in the same direction as the shielding material element wire forming the first transverse shield layer to form a second A double rail winding shield layer formed by forming a rail winding shield layer, wherein the first rail winding shield layer and the second rail winding shield layer are compressed to form a first rail winding shield layer, so that the second rail winding shield layer is formed. An outer sheath is formed after the shield material element wires to be configured and between the layers of the first transverse winding shield layer and the second transverse winding shield layer are tightly formed.

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