JP2010092732A - Box ground bar, extra-fine coaxial cable assembly using box ground bar, and method of assembling extra-fine coaxial cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure strength regardless of thickness reduction for size reduction to cope with a low profile connector. <P>SOLUTION: A box ground bar 1 is used to solder external conductors which are exposed by partially removing envelopes of a plurality of juxtaposed extra-fine coaxial cables to be coupled and fixed by nipping the conductors from above and from below. The bar is characterized in that upper and lower ground bars 17, 19 for nipping the external conductors of the plurality of extra-fine coaxial cables from above and from below, a coupling ground bar 21 integrally coupling one-side edges of the upper and lower ground bars 17, 19 which are on the same sides in their width directions across the widths and an opening 23 which opens the other sides opposing the coupling ground bar 21 constitute the whole into a box-shape and a plurality of holes 21H through which the external conductors of the plurality of extra-fine coaxial cables pass are formed in the coupling ground bar 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a box-type ground bar that can cope with strength and downsizing when manufacturing a micro-coaxial cable assembly, a micro-coaxial cable assembly using the box-type ground bar, and a method for assembling a micro-coaxial cable.

  In recent years, electronic devices typified by mobile phones have been rapidly reduced in size, weight, and functionality. Therefore, as a required technical trend, miniaturization of wiring materials and terminal connectors has become indispensable.

  Referring to FIGS. 8 and 9, in the product of the micro coaxial cable assembly 101, miniaturization of the end processing of the shielded wire is required as a part thereof. Generally, the micro coaxial cable 103 includes a center conductor 105, an insulator 107 provided on the outer periphery of the center conductor 105, an external conductor 109 provided on the outer periphery of the insulator 107, and an outer periphery of the outer conductor 109. And a jacket 111 that is covered. The plurality of parallel central conductors 105 are fixed with a pitch fixing tape 113, and the external conductors 109 exposed by peeling the outer jacket 111 are shielded.

  As the terminal treatment of the shielded wire of the micro coaxial cable assembly 101, the outer conductor 109 of the plurality of micro coaxial cables 103 is a rectangular conductor called a ground bar 115 such as a flat tin-plated annealed copper wire or a flat phosphor bronze tin-plated wire from above and below. The external conductor 109 is connected with the solder 117 between the flat conductors.

  For example, in Patent Document 1, there is a description that phosphor bronze is used as the ground bar, and the entire thickness of the ground portion is 0.5 mm.

  In Patent Document 2, two ground bars are used, and a shield process is performed by soldering the two ground bars at a predetermined position in the middle portion of the coaxial cable.

  Patent Document 3 describes a soldering method for a ground bar. A part of the outer conductor is exposed, and at least two of the exposed portions of the outer conductor are held by at least two fixing means. While applying ultrasonic vibration to the outer conductor through at least one fixing means, the outer conductor is bent and cut in the circumferential direction by reciprocating between two adjacent fixing means as a fulcrum. Thus, the terminal processing of the shield wire is performed. In this case as well, a plurality of ground bars are used as in Patent Documents 1 and 2.

  Moreover, in patent document 4, it is the structure which put the ground bar beforehand in the connector in the step before a coaxial cable is integrated. This eliminates the unstable process of connecting the ground bar to the coaxial cable, and reduces the required number of ground bars.

  With the miniaturization of the connector of the electronic device, the thickness of the ground bar soldering portion 119 of the micro coaxial cable assembly 101 as described above tends to be lowered.

  For example, as shown in FIGS. 10A and 10B, the thickness of the conventional ground bar soldering portion 119 is about 0.5 mm, but as the connector is downsized, FIG. As shown in A) and (B), it has become necessary to make the thickness of the ground bar soldering portion 119 correspond to 0.38 mm. 10A and 10B, when the thickness of the ground bar soldering portion 119 is 0.5 mm, a rectangular conductor such as phosphor bronze having a thickness of 0.1 mm is used. A rectangular conductor such as phosphor bronze having a thickness of 0.1 mm is used.

Further, as another method for dealing with the low profile connector, there is a method of thinning the phosphor bronze ground bar 115 made of the same material as shown in FIG. For example, a ground bar 115 having a thickness of 0.05 mm is used.
Japanese Patent Laid-Open No. 10-144145 Japanese Patent No. 3371797 Japanese Patent No. 3185208 JP 2006-221863 A

  By the way, in the method corresponding to the low-profile connector in FIG. 11, if the ground bar 115 having a plate thickness of 0.1 mm is used, the micro coaxial cable 103 is crushed. There was a problem that it occurred.

  Further, in the method corresponding to the low-profile connector of FIG. 12, since the ground bar 115 is thinned, the strength of the ground bar 115 in the length direction (the width direction of the micro coaxial cable assembly 101) is deteriorated. In this case, since the strength is weak with respect to the radial direction of the connector after the assembly of the connector, it is easy to bend. When the connector is bent, there is a problem in that it causes disconnection at the soldered portion of the central conductor 105 inside the connector.

  In the terminal processing of the shielded wire of the conventional micro coaxial cable assembly 101, the two ground bars 115 are used, and the shield portion of the micro coaxial cable 103 is filled with the solder 117 between the two ground bars 115. However, since the two thin ground bars 115 are soldered in parallel, it is difficult to position them, so that there is a problem that processing time is required.

  Furthermore, since the position of the two ground bars 115 may move during soldering, the entire width of the two upper and lower ground bars 115 soldered becomes wider as shown in FIG. As a result, as shown in FIG. 14, there is a problem that a defect that cannot be inserted into the slot 121 of the connector occurs.

  Since the two ground bars 115 are used, the micro coaxial cable 103 may move during soldering, and the micro coaxial cable 103 aligned in advance at a predetermined pitch is fixed in a moving state. There was a problem that it became a defective product.

  As described above, the conventional problems are that if the thickness of the ground bar soldering portion 119 is reduced while keeping the thickness of the ground bar 115 in order to cope with the reduction in thickness and size required in recent years, the micro coaxial cable 103 is reduced. The center conductor 105 and the outer conductor 109 are short-circuited. On the other hand, if the thickness of the ground bar 115 is reduced, the strength in the length direction of the ground bar 115 is deteriorated, so that it is likely to bend in the width direction of the connector, causing disconnection.

  SUMMARY OF THE INVENTION An object of the present invention is to make it possible to cope with a low-profile connector in response to strength even if the thickness is reduced in order to reduce the size.

In order to solve the above-described problems, the box-type ground bar of the present invention removes a part of the jackets of a plurality of parallel micro coaxial cables and sandwiches and exposes the exposed external conductor from above and below to connect and fix them. A box-shaped ground bar,
An upper and lower ground bar sandwiching the outer conductors of the plurality of micro coaxial cables from above and below, and a connecting ground bar integrally connecting one side edge of the upper and lower ground bars in the width direction on the same side in the width direction; In addition, the whole is configured in a box shape with an opening opening on the other side facing the connection ground bar, and a plurality of hole portions through which the plurality of micro coaxial cables are inserted are provided in the connection ground bar. It is characterized by this.

  In the box-type ground bar of the present invention, in the box-type ground bar, the upper ground bar, the connecting ground bar, and the lower ground bar are integrally connected by a bent portion for forming by bending into a box shape. Preferably it is.

The micro coaxial cable assembly of the present invention integrally connects the upper and lower ground bars and one side edge of the upper and lower ground bars in the width direction in the length direction, and includes a plurality of micro coaxial cables. A box-shaped ground bar that is configured as a whole with a connection ground bar provided with a plurality of holes through which the external conductor is inserted, and an opening that opens the other side facing the connection ground bar;
A plurality of parallel micro coaxial cables that are parallel to each other and that are exposed by removing a part of the jacket of each micro coaxial cable, corresponding to the plurality of holes of the connecting ground bar of the box-type ground bar. The plurality of micro-coaxial cables,
The outer conductors of the plurality of micro coaxial cables inserted into the box-type ground bar and the inside of the box-type ground bar are connected and fixed by soldering.

In the method of assembling the micro coaxial cable according to the present invention, the outer conductor exposed by removing a part of the jackets of the plurality of micro coaxial cables arranged in parallel is sandwiched from above and below by the upper and lower ground bars and connected and fixed by soldering. In the coaxial cable assembly method,
In advance, a connection ground bar for integrally connecting and connecting one side edge in the width direction of the upper and lower ground bars integrally in the width direction, and an opening opening the other side facing the connection ground bar Forming a box-shaped ground bar in its entirety, and forming a plurality of holes across the width direction of the connecting ground bar;
The outer conductor exposed by removing a part of the jacket of each of the plurality of micro coaxial cables is inserted corresponding to the plurality of holes of the connection ground bar of the box-type ground bar,
The outer conductors of the plurality of micro coaxial cables inserted into the box type ground bar and the inside of the box type ground bar are connected and fixed by soldering.

  As can be understood from the means for solving the above-described problems, according to the present invention, it is possible to provide a box-type ground bar that can cope with strength and downsizing when manufacturing an ultra-fine coaxial cable assembly. .

  In other words, since the box-type ground bar is used, the strength can be maintained even if it is thin, so that it can be soldered without causing a tangle of the ultrafine coaxial cable. Further, it is possible to increase the strength against bending in which one end in the width direction of the microfine coaxial cable assembly is fixed by the fixing portion and the other end is pressed by the pressing portion. Moreover, the strength against bending in the width direction of the micro coaxial cable assembly can be increased. Further, the box-type ground bar can be soldered without causing a positional shift between the upper and lower ground bars. In addition, since the plurality of micro coaxial cables are positioned in the plurality of holes of the box-type ground bar, soldering can be performed without disturbing the predetermined pitch of the plurality of micro coaxial cables. Also, during soldering, heat is quickly transferred to the entire box-type ground bar, so that the soldering operation time can be shortened.

  Embodiments of the present invention will be described below with reference to the drawings.

  3 and 6, the box-type ground bar 1 according to this embodiment is used when a plurality of parallel micro coaxial cables 3 are shielded. As shown in FIGS. 5 and 6, the micro coaxial cable 3 includes a center conductor 5, an insulator 7 provided on the outer periphery of the center conductor 5, and an external provided on the outer periphery of the insulator 7. It comprises a conductor 9 and a jacket 11 covering the outer periphery of the outer conductor 9.

  That is, by using the box-type ground bar 1 to remove a portion of the jacket 11 of the parallel micro coaxial cables 3 described above, the exposed external conductor 9 is sandwiched from above and below, and is connected and fixed by the solder 13. By performing the terminal processing of the shielded wire, the product of the micro coaxial cable assembly 15 is assembled.

  The box-type ground bar 1 of this embodiment will be described in detail. As shown in FIGS. 1 and 2, the upper and lower ground bars 17 and 19 sandwich the outer conductor 9 of the plurality of micro coaxial cables 3 from above and below. A connecting ground bar 21 that integrally connects one side edge of the upper and lower ground bars 17 and 19 on the same side in the width direction in the width direction (upward and downward oblique direction in FIG. 1), and the connecting ground bar 21 The entire opening 23 is formed in a box shape having a U-shaped cross section (U shape). Further, the connecting ground bar 21 has a plurality of hole portions 21H through which the outer conductors 9 of the plurality of micro coaxial cables 3 are inserted toward the longitudinal direction of the connecting ground bar 21 at a predetermined pitch set in advance. Is provided.

  In this embodiment, as shown in FIG. 3, a single metal plate 25 has a U-shaped cross-section (U-shaped) in cross section with two fold lines BL substantially parallel to the longitudinal direction. By bending into a box shape, a box-shaped ground bar-1 is integrally formed with the upper ground bar 17, the connecting ground bar 21, the lower ground bar 19, and the opening 23 in a U-shaped cross section (U-shaped). It is a thing.

  Further, as shown in FIG. 3 and FIG. 4, for example, a bending groove portion 27 as a bending portion is formed in advance on one surface of the metal plate 25 at the position of the two folding lines BL. Has been. It becomes easier to bend | fold by the said groove part 27 for bending. After that, a plurality of holes 21H are formed in the connecting ground bar 21 by a method such as punching.

  For example, as one metal plate 25, for example, a phosphor bronze sheet having a thickness of 50 μm is used, and this phosphor bronze sheet is etched. That is, the bent groove portion 27 is formed by half-etching the bent portion. Thereafter, the phosphor bronze sheet is subjected to tin plating. Thereafter, the box-shaped ground bar 1 is formed by bending at a half-etched portion.

  The box-type ground bar 1 described above is manufactured by etching and bending, but can be bent by simple press processing. That is, the bending groove 27 does not have to be formed.

  Further, the thickness of the metal plate 25 is not limited to the above 50 μm. For example, a thin plate having a thickness of 30 μm to 100 μm is used. However, in order to reduce the thickness and size of the connector, it is preferable that the thickness is as thin as possible if the strength can be secured.

Moreover, box-type ground bar 1, as shown in FIG. 2, top, reducing the thickness T ₁ of the lower ground bars 17 and 19, also increasing the thickness T ₂ of the connecting ground bar 21 it can. Thereby, thickness reduction and strength increase can be ensured.

  In this embodiment, the box-type ground bar 1 is formed by bending one metal plate 25 as described above. However, the present invention is not limited to this. For example, the upper ground bar 17 and the connecting ground bar 21 The lower ground bar 19 may be integrally connected in a U-shaped cross section by brazing or other connection methods.

  Next, a micro coaxial cable assembly 15 according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part similar to description of the box-type ground bar 1 of embodiment mentioned above, and detailed description is abbreviate | omitted.

  Referring to FIGS. 5 and 6, the micro coaxial cable assembly 15 uses the box-type ground bar 1 of the above-described embodiment. In this embodiment, the box-type ground bar 1 is tin-plated after the upper and lower ground bars 17 and 19 and the connecting ground bar 21 are formed by bending a metal plate 25 made of a phosphor bronze sheet having a thickness of 50 μm into a box shape. It has been done. A plurality of holes 21H are provided in the connection ground bar 21 portion. As shown in FIG. 5, the strength against bending in the width direction in which one end in the width direction of the micro coaxial cable assembly 1 is fixed by the fixing portion 31 and the other end is pressed by the pressing portion 37 can be increased. . Therefore, compared with the case where two conventional ground bars are used, the strength is about three times higher when the plate thickness is the same.

  The external conductor 9 exposed by removing a part of the jacket 11 of each of the plurality of micro coaxial cables 3 arranged in parallel corresponds to the plurality of holes 21H of the connection ground bar 21 of the box-type ground bar 1 described above. It is inserted. At this time, the box-type ground bar 1 is placed on the base 35 of the soldering device 29 at one end side in the length direction of the box-type ground bar 1 as shown in FIG. In this state, a load is applied to the other end side in the length direction of the box-type ground bar 1 by the pressing portion 37 of the solder device 29.

  Next, as shown in FIG. 6, the box-type ground bar 1 is filled with solder 13 and heated by a heater (not shown) so that the outer conductors 9 and the box-type ground bars of the plurality of micro coaxial cables 3 are heated. 1 is connected and fixed by solder 13.

  From the above, the box-type ground bar 1 and the micro coaxial cable assembly 15 have the following effects.

(1) By using the box-type ground bar 1 having upper and lower ground bars 17 and 19 having a small thickness, for example, 50 μm, the solder 13 is filled without soldering the fine coaxial cable 3. Can be attached.

  More specifically, conventionally, when soldering the ground bar, soldering is performed using the same pressure type soldering device 29 as shown in FIG. When two ground bars are used, the fine coaxial cable may be pressed during soldering. However, by using the box-type ground bar 1 of this embodiment, the fine coaxial cable 1 is soldered without being pressed too much. be able to.

(2) Unlike the conventional structure in which only two 50 μm thick ground bars are sandwiched, the upper and lower ground bars 17, 19 having a thickness of, for example, 50 μm are integrated into a box shape by the connecting ground bar 21. By using the box-type ground bar 1 connected to, even when the upper and lower ground bars 17 and 19 are thin, the strength can be maintained by the connection ground bar 21. The connecting ground bar 21 can be made thicker than the upper and lower ground bars 17 and 19 to further increase the strength.

  That is, even if the thicknesses of the upper and lower ground bars 17 and 19 are reduced, the strength against bending in the width direction of the micro coaxial cable assembly 15 (the length direction of the box-type ground bar 1) can be increased. Thereby, the strength of the connector to be thinned can be given to the cable itself used inside.

(3) Since the upper and lower ground bars 17 and 19 are integrated with the connecting ground bar 21 by using the box-type ground bar 1, the upper and lower ground bars 17 and 19 are displaced up and down. Can be soldered without any problems.

  More specifically, in the prior art, the ground bar is soldered using the same pressure type soldering device 29 as shown in FIG. 7, but if two ground bars are used, the upper and lower ground bars are The position may be misaligned and soldered. However, by using the integrated box-type ground bar 1 of this embodiment, the upper and lower ground bars 17 and 19 can be soldered without deviation.

(4) Since the outer conductors 9 of the plurality of micro coaxial cables 3 are inserted into the plurality of holes 21H of the connection ground bar 21 of the box-type ground bar 1, the micro coaxial cables 3 are positioned at predetermined positions. Therefore, it is possible to perform soldering without disturbing the predetermined pitch of the plurality of micro coaxial cables 3 during soldering. In other words, the pitch of the plurality of micro coaxial cables 3 arranged in advance at a predetermined pitch can be soldered with the box-type ground bar 1 without changing.

(5) Conventionally, soldering of the ground bar is performed using the same pressure-type soldering device 29 as shown in FIG. 7, but when two ground bars are used, the soldering device 29 is directly connected to the heater. It takes time because the upper ground bar that hits it is overheated, and heat flows in the order of the solder sheet, the cable, and the lower ground bar. However, by using the integrated box-type ground bar 1 of this embodiment, heat is quickly transferred to the entire box-type ground bar 1, so that the soldering operation time can be shortened.

It is a perspective view of the box type ground bar of an embodiment of this invention. It is sectional drawing perpendicular | vertical to the length direction of the box-type ground bar of FIG. It is a perspective view which shows the process in which it shape | molds to the box-type ground bar of FIG. It is sectional drawing perpendicular | vertical to the length direction of the metal plate of FIG. It is a perspective view which manufactures a microfine coaxial cable assembly. 1 is a partial perspective view of a micro coaxial cable assembly according to an embodiment of the present invention. It is a perspective view which manufactures a microfine coaxial cable assembly. It is a partial perspective view of the conventional micro coaxial cable assembly. It is a longitudinal cross-sectional view of FIG. (A), (B) is sectional drawing which shows the dimension of the ground bar soldering part of the conventional micro coaxial cable assembly. (A), (B) is sectional drawing which shows the dimension of the ground bar soldering part of the conventional micro coaxial cable assembly reduced in height. (A), (B) is sectional drawing which shows the dimension of the ground bar soldering part of the other conventional micro coaxial cable assembly reduced in height. It is a top view which shows the malfunction state of the conventional micro coaxial cable assembly. It is a top view which shows the other malfunction state of the conventional micro coaxial cable assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box-type ground bar 3 Micro coaxial cable 5 Center conductor 7 Insulator 9 Outer conductor 11 Outer sheath 13 Solder 15 Micro coaxial cable assembly 17 Upper ground bar 19 Lower ground bar 21 Connection ground bar 21H Hole 23 Opening 25 Metal plate 27 Folding groove 29 Solder device 31 Fixing part 33 Notch part 35 Pressing base 37 Pressure part

Claims (4)

A box-type ground bar that removes a part of the jacket of a plurality of parallel micro coaxial cables in parallel and sandwiches and exposes the exposed outer conductor from above and below, and is fixed by soldering,
An upper and lower ground bar sandwiching the outer conductors of the plurality of micro coaxial cables from above and below, and a connecting ground bar integrally connecting one side edge of the upper and lower ground bars in the width direction on the same side in the width direction; In addition, the whole is configured in a box shape with an opening opening on the other side facing the connection ground bar, and a plurality of hole portions through which the plurality of micro coaxial cables are inserted are provided in the connection ground bar. A box-type ground bar.   2. The box-type ground bar according to claim 1, wherein the upper ground bar, the connection ground bar, and the lower ground bar are integrally connected by a bent portion for forming the box by bending it. A plurality of holes for integrally connecting the upper and lower ground bars and one side edge of the upper and lower ground bars on the same side in the width direction through the outer conductors of the plurality of micro coaxial cables A box-shaped ground bar that is configured in a box shape as a whole with a connection ground bar provided with an opening on the other side facing the connection ground bar;
A plurality of parallel micro coaxial cables that are parallel to each other and that are exposed by removing a part of the jacket of each micro coaxial cable, corresponding to the plurality of holes of the connecting ground bar of the box-type ground bar. The plurality of micro-coaxial cables,
An ultra-fine coaxial cable assembly, wherein the outer conductors of the plurality of micro-coaxial cables inserted into the box-type ground bar and the interior of the box-type ground bar are connected and fixed by soldering. In the method of assembling the micro coaxial cable, the outer conductor exposed by removing a part of the jacket of the plurality of micro coaxial cables arranged in parallel is sandwiched from above and below by the upper and lower ground bars and connected and fixed by soldering.
In advance, a connection ground bar that integrally connects one side edge in the width direction of the upper and lower ground bars integrally over the width direction, and an opening that opens the other side facing the connection ground bar, A box-shaped box-shaped ground bar is formed as a whole, and a plurality of holes are formed over the width direction of the connecting ground bar,
The outer conductor exposed by removing a part of the jacket of each of the plurality of micro coaxial cables is inserted corresponding to the plurality of holes of the connection ground bar of the box-type ground bar,
An assembly method of a micro coaxial cable, wherein the outer conductor of the plurality of micro coaxial cables inserted into the box ground bar and the interior of the box ground bar are connected and fixed by soldering.

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