A multicore ultrafine coaxial wire is formed by consolidating a plurality of ultrafine coaxial wires in a flat array. Each of the ultrafine coaxial wires has a center conductor, whose tip portion is exposed, an insulating layer, an outer conductor, and a covering. The harness has a grounding member that connects in common the outer conductors of the multicore ultrafine coaxial wire and an insulator frame that fixes the center conductors. End portions of an underside film and end portions of a topside film both of the insulator frame are provided with an alignment hole to align the center conductors with circuits on a substrate.

RELATED APPLICATIONS

This application is the U.S. National Phase under 35 U.S.C. §371 of International Application No. PCT/JP2008/052170, filed on Feb. 8, 2008, which in turn claims the benefit of Japanese Application No. 2007-072515, filed on Mar. 20, 2007, the disclosures of which Applications are incorporated by reference herein.

TECHNICAL FIELD

The present invention relates to an ultrafine-coaxial-wire harness, a connecting method thereof, a circuit-board-connected body, a circuit-board module, and an electronic apparatus.

BACKGROUND ART

A connector has been known that connects a plurality of ultrafine coaxial wires to circuits on a substrate, as disclosed in Patent literature 1, for example.

As shown in FIG. 7, a connector 100 is fitted to a receptacle (not shown) to electrically connect a plurality of ultrafine coaxial wires 101 to a substrate. The connector 100 has (a) a housing 102 made of insulating material, such as a plastic material, (b) a plurality of conducting terminals 103 placed, with a specified pitch, along the width of the housing 102, and (c) a shield plate 104 covering the top surface of the housing 102. The individual conducting terminals 103 are placed in individual wire-housing recessed portions 105 that are formed so as to adjoin to one another, with a specified pitch, along the width of the housing. Thus, the individual conducting terminals 103 are aligned. Each of the ultrafine coaxial wires 101 to be connected to the conducting terminal 103 has a center conductor 107 to be connected to the conducting terminal 103 by using solder or the like, an insulating layer 108 covering the center conductor 107, an outer conductor 109 formed at the outside of the insulating layer 108, and a covering 110 covering the outer conductor 109. The individual ultrafine coaxial wires 101 are treated such that the individual center conductors 107 are individually connected to the corresponding individual conducting terminals 103 and the individual outer conductors 109 are connected to the connector 100 through a swaging member 111 collectively.Patent literature 1: the published Japanese patent application Tokukai 2005-302604.

DISCLOSURE OF THE INVENTION

Problem to be Solved by the Invention

Ultrafine coaxial wires used in a mobile telephone and the like are connected to other wires, a substrate, or another member through a connector. In contrast, in the connector 100 in Patent literature 1, the individual outer conductors 109 of a plurality of ultrafine coaxial wires 101 are connected to the connector by swaging using the swaging member 111, which is a single common connecting metal plate, rather than using the soldering. Consequently, because no impregnation of solder to the outer conductor 109 occurs, the flexibility of the ultrafine coaxial wires 101 is not impaired. Patent literature 1 states that the above-described structure improves the workability of the ultrafine coaxial wires in a narrow connecting space.

Nevertheless, as the size of the apparatus is decreased, the space that can be secured as the connecting space is becoming smaller and smaller. To mitigate the connecting difficulty, ultrafine coaxial wires use a fine conductor having a diameter of American Wire Gauge (AWG) 40 to 45, for example. Under these circumstances, it becomes difficult to adopt the connecting structure through the connector as described in Patent literature 1. In view of the foregoing situation, to minimize the space for the connection, researchers and engineers are required to develop connectorless connection such as direct connection of the center conductors of individual ultrafine coaxial wires to circuits of an apparatus without using a connector.

An object of the present invention is to offer an ultrafine-coaxial-wire harness that enables connectorless connection to a substrate in a narrow space while maintaining the reliability and speediness of the operation, a circuit-board-connected body incorporating the harness, and so on.

Means to Solve the Problem

An ultrafine-coaxial-wire harness of the present invention comprises the following members:(a) a plurality of ultrafine coaxial wires, each of which comprises the following members in the following order:(a1) a center conductor whose end portion is exposed;(a2) an insulating layer that has the shape of a tube and that is exposed at its end portion;(a3) an outer conductor whose end portion is exposed; and(a4) a covering;(b) an insulator frame that fixes the individual center conductors in a state where the individual center conductors are arranged in a lateral direction; and(c) a grounding member that is connected to the exposed portions of the individual outer conductors.
In the harness, the insulator frame is provided with an alignment portion to align the center conductors to circuits on a substrate.

By employing the above structure, the center conductors can be aligned with circuits on a substrate, to which the ultrafine coaxial wires are connected, through the alignment portion speedily and easily. As a result, connectorless connection can be performed in a narrow space.

The above-described ultrafine-coaxial-wire harness may have the following structure:(a) the insulator frame has a topside member and an underside member to hold the center conductors from both above and under;(b) the underside member has a pair of long rectangular portions and a pair of end portions each of which is connected to the long rectangular portions at their ends; and(c) the pair of long rectangular portions and the pair of end portions together form a window portion such that they surround the window portion, which exposes the center conductors.
By employing this structure, under the condition that the center conductors are stably supported by the pair of long rectangular portions, in the window portion surrounded by the long rectangular portions and end portions, the center conductors can be connected to circuits on the substrate. Thus, the connection can be stabilized.

In particular, as the above-described alignment portion, an alignment hole may be provided at each of the pair of end portions of the insulator frame. The alignment holes improve the workability.

The foregoing grounding member may be provided with an engaging portion that engages with the exposed portions of the individual outer conductors. This structure allows the engaging portion to determine the arranging positions of the individual center conductors. By coupling the grounding member to the insulator frame, the individual center conductors can be connected to the substrate under the condition that the individual ultrafine coaxial wires are stably held.

A connecting method of the present invention for the ultrafine-coaxial-wire harness is a method of connecting the individual center conductors to individual circuit members of a circuit board, which has a plurality of circuit members, by performing alignment using the alignment portion as a reference. This method enables speedy and easy mounting of the ultrafine coaxial wires onto the circuit board.

The foregoing connecting method may perform, before performing the alignment using the alignment portion as a reference, (a) the arranging of the individual center conductors of the ultrafine coaxial wires between a pair of films by using guide holes as a reference to fix the center conductors and (b) the forming of alignment holes in the pair of films as the alignment portion. In this case, at the time the pair of films are bonded together, even if the films produce a slight positional deviation or wrinkles, by forming alignment holes separately and performing the alignment using the alignment holes as a reference, the center conductors can be reliably connected to the circuit members on the substrate.

A circuit-board-connected body of the present invention comprises the following members:(a) a circuit board provided with a plurality of circuits; and(b) an ultrafine-coaxial-wire harness of the present invention provided on the circuit board.
This structure enables the offering of a circuit-board-connected body suitable for the miniaturization and thickness reduction of the apparatus to which the ultrafine-coaxial-wire harness is incorporated. The term “circuit board” is a generic name for a flexible printed-circuit board (FPC), a flexible flat cable (FFC), and a rigid printed-circuit board (PCB).

A circuit-board module of the present invention comprises the following members:(a) a circuit-board-connected body of the present invention; and(b) an electronic component mounted on the circuit board.
An electronic apparatus of the present invention comprises the above-described circuit-board module. In these items, also, the present invention can offer a circuit-board module and an electronic apparatus suitable for the miniaturization and thickness reduction.

Effect of the Invention

By employing an ultrafine-coaxial-wire harness, a connecting method thereof, a circuit-board-connected body, a circuit-board module, or an electronic apparatus all of the present invention, connectorless connection to circuits on a substrate can be performed in a narrow space while maintaining the speediness and easiness of the operation.

EXPLANATION OF SIGNS

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment

FIG. 1is a perspective view of an ultrafine-coaxial-wire harness according to an embodiment of the present invention.FIG. 2Ais a plan view of the ultrafine-coaxial-wire harness shown inFIG. 1, andFIG. 2Bis a cross section viewed from the line II b-II b inFIG. 2A.

As shown inFIGS. 1,2A, and2B, a multicore ultrafine coaxial wire10according to this embodiment is formed by consolidating a plurality of ultrafine coaxial wires11in a flat array. Each of the ultrafine coaxial wires11has a center conductor12having a cross section of a nearly perfect circle, an insulating layer13covering the center conductor12, an outer conductor14that is formed around the insulating layer13and that is grounded, and a covering15covering all the members. The end portion of the center conductor12is exposed, and the exposed portion is flattened by rolling in a direction of the flat array of the ultrafine coaxial wires. Nevertheless, the exposed portion of the center conductor12is not necessarily required to be flat. In addition, the insulating layer13and the outer conductor14are also exposed in the shape of a step in succession out of the covering15.

The ultrafine-coaxial-wire harness is also provided with (a) a grounding member20that connects in common all the exposed portions of the outer conductors14of the multicore ultrafine coaxial wire10and (b) an insulator frame30that fixes the center conductors12.

The grounding member20has (a) an engaging portion21formed by bending, at a nearly right angle, both side portions of a plate material made of metallic conductor to obtain the shape of a channel bar and (b) an interconnecting portion22that has an interconnecting strip22bconnected to a part of the engaging portion21and grounding strips22aextending in a direction almost perpendicular to the engaging portion21at a position having nearly the same height as that of the center conductors12. The engaging portion21has vertical-wall portions21aeach having the shape of waves and a bottom-wall portion21b. The vertical-wall portions21aeach have a large number of wave-shaped grooves formed with a fixed pitch to engage with the outer conductors14. The interconnecting strip22bof the interconnecting portion22is bonded to the vertical-wall portions21aat both sides by brazing. The individual grooves in the engaging portion21are connected to the individual outer conductors14by soldering. An adhesive is applied to the outer conductor14's exposed portion to which no soldering is performed. In this embodiment, the engaging portion21maintains the spacing between the ultrafine coaxial wires with a specified pitch, thereby determining the arranging positions of the individual center conductors12. In the structure shown inFIG. 1, the engaging portion21is provided only at one side. Nevertheless, another structure may be employed in which a pressing member having another engaging portion or a pressing member formed of a flat plate is also provided at the other side so that the outer conductors14can be held from both sides.

The insulator frame30has (a) an underside film31, which is an underside member that supports connecting surfaces12aof the center conductors12, (b) a topside film32, which is a topside member that holds pressure-receiving surfaces12bof the center conductors12, and (c) a pressing plate33that is placed between the topside film32and the pressure-receiving surfaces12bof the center conductors12. The underside film31is formed of (a) a pair of long rectangular portions31x, which extend in a direction nearly perpendicular to the center conductors12, and (b) a pair of end portions31ythat connect the long rectangular portions31xat their both ends. A window portion31ais formed inside a frame formed by the long rectangular portions31xand the end portions31yto allow the center conductors to be connected to circuits on a substrate. Each of the end portions31yis provided with an alignment hole36to align the individual center conductors12with the individual circuit members on the substrate. The topside film32has no window portion but has an outside dimension nearly equal to that of the underside film. The alignment holes36also penetrate through both end portions32yof the topside film32. The underside film31, the topside film32, and the pressing plate33are individually fixed to the center conductors12with a thermosetting resin (such as an epoxy resin). The grounding strips22aof the interconnecting portion22of the grounding member20are also fixed to the underside film31and the topside film32with a thermosetting resin.

The ultrafine coaxial wire11uses a fine conductor having a diameter of American Wire Gauge (AWG) 40 to 46, for example. The center conductor12positioned at the center of the ultrafine coaxial wire11is usually formed of a copper stranded wire by choice because it is flexible and endures bending. Nevertheless, this embodiment uses a solid wire, which is resistant to deformation. The flattened portion of the center conductor has a thickness of about 75 μm, for example, and the grounding strip22aof the interconnecting portion22also has a comparable thickness.

As the underside film31and the topside film32, a thermosetting resin, such as polyester or polyimide, may be used. The underside film31and the topside film32are fixed to the center conductors12by using an adhesive (a thermosetting resin, such as an epoxy resin, or a thermoplastic resin). In other words, the flattened center conductors12are bonded to the topside and underside films through the adhesive applied to the topside and underside of the center conductors12. Thus, the center conductors12are securely held. Because the center portion of the underside film31forms the window portion31a, as shown inFIG. 2A, the window portion31aexposes all the center conductors12and the grounding strips22aof the interconnecting portion22of the grounding member20.

As shown inFIGS. 2A and 2B, it is desirable to place the pressing plate33between the topside film32and the pressure-receiving surfaces12bof the center conductors12. The pressing plate33has a length sufficient to include the total width of the center conductors12and the grounding strips22aof the interconnecting portion22of the grounding member20(in a left-to-right direction inFIG. 2A) (the grounding strips22aare placed at both sides of the group of the center conductors12). Furthermore, the pressing plate33has a width to such an extent that it covers the most part of the exposed portions of the center conductors12and the grounding strips22aof the interconnecting portion22in the window portion31a. This structure increases the strength of the portion sandwiched between the underside film31and the topside film32. When the connecting surfaces12aof the center conductors12are pressed to the circuits on the substrate, the elastic force of the pressing plate33can maintain a good condition of the contact between the center conductors12and the circuits and between the grounding strips22aof the interconnecting portion22and the circuits. Thus, the center conductors12and the grounding strips22acan be securely connected electrically to the circuits.

Production Method

FIGS. 3A to 3Care plan views and cross-sectional views together showing the steps of producing the ultrafine coaxial wire of this embodiment. However,FIGS. 3A to 3Comit the illustration of the grounding strips22aof the interconnecting portion22of the grounding member20.

First, in the step shown inFIG. 3A(the step of arrangement), a plurality of ultrafine coaxial wires11(two wires inFIG. 3A) are arranged in a flat array. A slit having a specified length is made in the covering15by burning through it with a laser to remove the slit portion. Specified lengths of the outer conductor and the insulating layer13are also removed by cutting them using the heat of a laser. Thus, the outer conductor14, the insulating layer13, and the center conductor12are exposed in succession in the shape of a step with the specified length. The individual outer conductors14are engaged with the individual grooves of the engaging portion21of the grounding member20. The outer conductors14are fixed to the engaging portion21with solder or a conductive adhesive. As a result, the individual ultrafine coaxial wires11are arranged with a fixed pitch (the same pitch as that of the circuits on the substrate). In other words, the center conductors12are arranged with the same pitch as that of the circuits on the substrate.

Next, in the step shown inFIG. 3B(the step of rolling), a rolling region R shown inFIG. 3Bis rolled. The rolling region R includes the exposed region of the center conductor12excluding the tipmost portion12cand a part of the tip portion of the insulating layer13. The rolling operation flattens the exposed tip portion of the center conductor.

Subsequently, in the step shown inFIG. 3C(the step of covering), the pressing plate33is placed on the pressure-receiving surfaces12bof the flattened portion of the center conductors12. The topside film32is bonded to the flattened center conductors12and the rolled portions of the insulating layers13. Then, the underside film31is bonded to the foregoing members in such a way that its position coincides with the topside film32. In this case, the underside film31is positioned such that the window portion31aexposes the connecting surfaces12aof the center conductors12.

Finally, the center conductors12, the underside film31, and the topside film32are cut at a cutting line L to remove the tipmost portions12cof the center conductors12.

The step shown inFIG. 3Cis explained in further detail below.FIGS. 4A and 4Bare plan views showing the detail of the step shown inFIG. 3Cin succession. To facilitate the understanding, inFIGS. 4A and 4B, the insulator frame30is shown only by the underside film31, with the illustration of the topside film32and the pressing plate33being omitted.

Although the illustration is omitted in the steps shown inFIGS. 3A and 3B, in the actual process, as shown inFIG. 4A, the tipmost portions13aof the insulating layers13cover the tipmost portions12c(seeFIG. 3C) of the center conductors12of the ultrafine coaxial wires11. An adhesive tape40is applied to the tipmost portions13a, so that the ultrafine coaxial wires11are arranged in a flat array. As shown inFIG. 4A, the underside film31is placed at the rolling region R shown inFIG. 3B. Then, the center conductors12, the grounding strips22aof the interconnecting portion22, and the insulating layers13are placed on the underside film31. Both end portions of the underside film31are provided with guide holes38to align the underside film31with the multicore ultrafine coaxial wire10and the grounding member20.

Next, the pressing plate33is placed on the center conductors12and the grounding strips22aof the interconnecting portion22. Then, an adhesive such as an epoxy resin is applied onto these members. Subsequently, the topside film32is placed on them.FIG. 4Bomits the illustration of the topside film32and the pressing plate33. However, the grounding strips22aof the interconnecting portion22of the grounding member20and the center conductors12are sandwiched between the underside film31and the pressing plate33(seeFIGS. 2A and 2B). Both end portions32y(seeFIG. 1) of the topside film32(not shown) are also provided with guide holes38at the same places as those of the underside film31. Under the condition that the guide holes38are coupled with pins of a working jig (not shown) and that the alignment is performed, the topside film32is superimposed on the underside film31at a specified position. Thus, a state shown in the right-side diagram inFIG. 3Cis produced. The guide holes38also perform the alignment between the engaging portion21of the grounding member20and the underside film31and between the engaging portion21of the grounding member20and the topside film32. Under this condition, the underside film31, the topside film32, the pressing plate33, the center conductors12, and the insulating layers13(the flattened portions) are pressed from both sides to fix the individual contacting portions with an epoxy resin or the like. In this case, the pressing plate33is not necessarily required.

Next, as shown inFIGS. 4A and 4B, when the center conductors12, the underside film31, and the topside film32are cut at the cutting line L shown inFIG. 3C, both end portions of the underside film31and the topside film32where the guide holes38are formed are removed by cutting. Then, alignment holes36are newly formed at both end portions31yof the underside film31after the alignment is performed by using the engaging portion21of the grounding member20as a reference, i.e., the alignment is performed with the arranged positions of the center conductors12. At this moment, although not shown inFIG. 4B, both end portions32yof the topside film32(seeFIG. 1), which is superimposed on the underside film31, are also provided with the alignment holes36that penetrate through the film.

FIGS. 5A to 5Dare plan views and cross-sectional views all showing the method of producing a circuit-board-connected body in which the ultrafine coaxial wires of this embodiment are coupled to rigid printed circuits. As shown inFIG. 5A, a rigid printed-circuit board50has (a) a rigid substrate51and (b) signal circuits52and grounding circuits53formed on the rigid substrate51. The rigid substrate51is provided with a pair of alignment holes54having the same spacing and size as those of the alignment holes36. Solder layers are formed at the tip portions of the signal circuits52and the grounding circuits53.

As shown inFIG. 5B, an assembling jig60is prepared that has a positioning stage61and a pair of pins62having the same pitch as that of but a size slightly larger than that of the alignment holes36and54.

As shown inFIG. 5C, the alignment holes36and54are slid onto the pair of pins62. Thus, the multicore ultrafine coaxial wire10is placed on the rigid printed-circuit board50. At this moment, because the window portion31ais an empty space, the pins62and the alignment holes36and54perform the alignment such that (a) the individual center conductors12are positioned directly over the individual signal circuits52with a gap and (b) the grounding strips22aof the interconnecting portion22of the grounding member20are positioned directly over the grounding circuits53with a gap. Solder is placed between the signal circuits52and the center conductors12and between the grounding circuits53and the grounding strips22aof the interconnecting portion22.

FIG. 5Dis a cross section viewed from the line Vd-Vd shown inFIG. 5C. As shown inFIG. 5D, when the topside film32is pressed with a heater tip70, at the window portion31a, the center conductors12are bonded to the signal circuits52with solder and the grounding strips22aof the interconnecting portion22are bonded to the grounding circuits53with solder. This operation electrically connects the multicore ultrafine coaxial wire10to the rigid printed-circuit board50in both the signal lines and grounding lines.

According to the ultrafine-coaxial-wire harness in this embodiment, the alignment holes36to align the center conductors12to the signal circuits52are provided in the underside film31and the topside film32of the insulator frame30for supporting the center conductors12of the ultrafine coaxial wires11. The alignment holes36enable a correct and speedy operation of placing the multicore ultrafine coaxial wire10on the members such as the rigid printed-circuit board50. Furthermore, the operation does not require a connector, and the space needed to the coupling can be a narrow space confined in the window portion31aof the underside film31.

The basic effect of the present invention can be exercised even when the center conductors12are fixed with an adhesive to the insulator frame30in this embodiment only by using the topside film32, without using the underside film31. However, because the insulator frame30is provided with the topside film32(the topside member) and the underside film31(the underside member) both for holding the center conductors from both above and under, the center conductors12can be held reliably. The presence of the films31and32enables the tip portion of the ultrafine-coaxial-wire harness to function in such a manner as an FPC does, so that the harness can be directly connected to or disconnected from a ZIF connector mounted on the substrate. In this case, because the underside film31has a pair of long rectangular portions31xand a pair of end portions31ythat are connected to the long rectangular portions31xat their both ends and the window portion31ais formed inside a frame formed by the long rectangular portions31xand the end portions31yto allow the center conductors12to be exposed, the center conductors12can be securely brought into contact with the signal circuits52within the window portion31a.

In addition, even when the window portion31ais not formed in the insulator frame30in this embodiment, more specifically, even when the insulator frame30has a structure in which the underside film31is provided with only one member of the long rectangular portions31x, the center conductors12can be held with the insulator frame30. Nevertheless, when the underside film31has a pair of long rectangular portions31x, the movement of the individual center conductors12can be prevented. As a result, the pitch between the center conductors12can be maintained at a fixed value more reliably.

The alignment of the center conductors12is not necessarily required to be carried out by using the engaging portion21of the grounding member20. The center conductors12can be aligned by using a member of the insulator frame30. Even in that case, the basic effect of the present invention can be exercised. Nevertheless, when the center conductors12are aligned by not only engaging the individual outer conductors14, which have a relatively large size, of the individual ultrafine coaxial wires11with the engaging portion21of the grounding member20but also coupling the engaging portion21to the insulator frame30through the interconnecting portion22of the grounding member20, the pitch between the center conductors12can be maintained stably.

In addition, because the grounding strips22aof the interconnecting portion22of the grounding member20are connected to the grounding circuits53on the rigid substrate51, the grounding line can be connected smoothly. However, the method of connecting the grounding line is not limited to the structure of this embodiment; various structures can be employed. For example, in a structure in which the grounding member20is not provided with the grounding strips22aof the interconnecting portion22, a grounding circuit is formed at a position corresponding to that of the interconnecting strip22bof the interconnecting portion22. A solder layer is formed on the grounding circuit. Finally, the interconnecting strip22bis connected to the grounding circuit by thermocompression bonding. This method can further decrease the space needed for the connection.

Furthermore, as shown inFIGS. 4A and 4BandFIGS. 5A to 5D, when the insulator frame30is coupled to the multicore ultrafine coaxial wire10and the grounding member20, the guide holes38of the insulator frame30are used. Thus, the underside film31can be bonded with the topside film32smoothly. Nevertheless, after the completion of the bonding, the underside film31and the topside film32sometimes produce a slight positional deviation or wrinkles due to the adhesive. To solve this problem, in addition to the guide holes38, the alignment holes36are formed that are aligned with the arranged position of the center conductors12. The alignment holes36enable the center conductors12to be connected reliably to the circuit members on the rigid substrate51such as the signal circuits52.

In other words, the bonding-together-use alignment portion (the guide holes38) is used to align the center conductors12with the insulator frame30in the step of fixing, using an adhesive, the center conductors12and the insulator frame30having the underside film31and the topside film32. On the other hand, the mounting-use alignment portion (the alignment holes36) is used to align the center conductors12with the circuits (the signal circuits52) on the substrate in the step of connecting the multicore ultrafine coaxial wire10to the circuit member on the substrate. The above-described method enables the secure connection of the multicore ultrafine coaxial wire10to the circuit member on the substrate.

Nevertheless, the alignment portion of the present invention is not limited to the alignment holes36and the guide holes38in this embodiment. Any form may be used providing that it engages with the engaging member of the working jig.

In the above-described embodiment, as an adhesive for fixing the underside film31and the topside film32to the center conductors12, an epoxy resin, which is a thermosetting resin, is used to heat and harden it. However, a thermoplastic resin, such as polyethylene or polypropylene, may be used to fuse it by heating and melting.

Structure of Circuit Board Module and Electronic Apparatus

FIG. 6is a perspective view showing the detail of the connection between various circuit boards contained in an electronic apparatus functioning as a mobile telephone.

The circuit-board module of this embodiment contained in an electronic apparatus constitutes a part of an integrated module that has the following components connected by using FPCs: (a) main display61that displays the screen of a mobile telephone provided with an LED90, (b) a first sub-PCB62and a main PCB63, both of which carry out the principal control in the electronic apparatus, (c) a subdisplay64that displays additional information of the mobile telephone, (d) an antenna65, (e) an incamera-controlling PCB66for controlling an incamera91, and (f) an attached-circuit-use PCB67. A self-contained memory, a baseband LSI (Large-Scale Integration), a power control IC (Integrated Circuit), a sound generator IC, an RF-receiving LSI, an RF-transmitting LSI, a power amplifier, a switching IC, and so on are divided and placed in the first sub-PCB62and the main PCB63.

Although not included in the integrated module, an outcamera93and a control circuit94for controlling the outcamera93are placed in the electronic apparatus.

The first sub-PCB62is connected to the main PCB63through an ultrafine coaxial wire83or an FPC. The connecting portion between the ultrafine coaxial wire83and the first sub-PCB62is provided with an ultrafine-coaxial-wire-use connector73. As shown in a state in which the ultrafine coaxial wire83and the main PCB63are disassembled at the connecting portion, the ultrafine-coaxial-wire-use connector73is composed of (a) an ultrafine-coaxial-wire harness77athat includes (a1) a grounding member and (a2) an insulator frame fixing the center conductors of the ultrafine coaxial wire and (b) a coaxial-wire-connecting portion77bat the substrate side.

The main display61is electrically connected to the first sub-PCB62through two FPCs81aand81b. The two FPCs81aand81bare (a) divided into a liquid-crystal-panel side and an LED-90side at the main display61and (b) connected to a common connector71at the first sub-PCB62.

The first sub-PCB62is connected to the subdisplay64through an FPC82and a connector72. The first sub-PCB62is also connected to the incamera-controlling PCB66through an FPC84and a connector74. The first sub-PCB62is also connected to the attached-circuit-use PCB67through an FPC85and connectors75and76. The main PCB63is connected to the antenna65through an FPC86and a connector78.

As the rigid substrate for the PCBs, not only a glass-reinforced epoxy board but also a paper-reinforced phenol board, a paper-reinforced epoxy board, a fluororesin board, an alumina board, and so on are used. As the material for the wiring, a copper alloy is usually used. However, the material is not limited to this material. As the flexible substrate, not only a polyimide board but also a polyester board (for low temperatures), a glass-reinforced epoxy board (a thin plate), and so on are used.

As described above, when the ultrafine-coaxial-wire harness of this embodiment is incorporated into a circuit-board module, which is a part of an integrated module, or an electronic apparatus having a circuit-board module, the ultrafine-coaxial-wire harness can be mounted on a circuit board correctly and speedily on a connectorless basis.

The above-described electronic apparatus includes, in addition to a mobile telephone, a camera, such as a digital camera and a camcorder, a portable audio player, a portable DVD player, and a portable laptop.

It is to be considered that the above-disclosed structure of an embodiments of the present invention is strictly illustrative and that the scope of the present invention is not limited to the scope of the above description. The scope of the present invention is shown by the description of the scope of the appended claims. Accordingly, the present invention is intended to cover all revisions and modifications included within the meaning and scope equivalent to the description of the scope of the claims.

INDUSTRIAL APPLICABILITY

The present invention can be employed not only for a mobile telephone but also for electronic apparatuses such as a camera, including a digital camera and a camcorder, a portable audio player, a portable DVD player, and a portable laptop.