JP4577363B2 - Coaxial cable connection structure and portable terminal device - Google Patents

Description

The present invention has a coaxial cable connection structure having two substrates that are overlapped and arranged so as to be able to move relative to each other in a direction perpendicular to the overlap direction, and that the substrates are electrically connected using a coaxial cable .及 beauty wherein relate mobile terminal device provided with a coaxial cable connection structure.

  For example, in the case of a mobile phone, the mobile phone is composed of two casings that are slidably stacked with each other, and the length of the mobile phone is extended by sliding these two casings according to the usage situation of the mobile phone. Can be shortened.

  The two casings are provided with a substrate on which various circuits and elements for realizing the respective functions are arranged, and further, a wiring member for electrically connecting these substrates. Since the substrates housed in the two housings slide with each other according to the operations of the housings, a flexible flexible substrate (FPC) is generally used as a wiring member that electrically connects these substrates. Patent Document 1 discloses an example using such a flexible substrate. As shown in FIG. 19, the connector 101 provided on the lower substrate 100 and the circuit module 102 provided on the upper side are provided. The connector 103 is connected to the flexible printed circuit 104 (FPC).

  In consideration of securing a low-resistance ground conductor and taking measures against EMI, there is known a full-ground structure having a ground conductor layer on substantially the entire surface on one side of the FPC. However, such a full-surface ground FPC cannot secure the bendability according to the slide of the substrate, and there is a possibility that the bent portion may be broken and disconnected.

In order to solve the problems related to the bendability of the FPC of the entire ground as described above, for example, in Patent Document 1, the ground portion is partially deleted at the bent portion, and a plurality of ground lines are provided on the back side of the bent portion. A configuration in which the signal lines are arranged so as not to face the signal lines is disclosed.
Japanese published patent: JP-A-2004-88020

As described above, in the FPC, the entire ground is good in terms of the electrical characteristics of the ground, but there is a problem of bendability, and if the entire ground is excluded, the electrical characteristics (impedance matching and EMI characteristics are unavoidable). ) Worsened.
In the method of disposing the ground line on the back surface of the bent portion as in Patent Document 1 so that the signal line and the ground line do not face each other, the number of signal lines increases due to high-speed data transmission and high density. The width of FPC is expanded. As a result, the space for sliding the FPC that must be secured between the two substrates increases. This is contrary to the miniaturization of equipment.

An object of the present invention is to provide mechanical connection related to bendability, in a device, in a connection structure that electrically connects two substrates that are arranged so as to be moved relative to each other in a direction perpendicular to the overlapping direction. reduced and impedance matching and coaxial cable connection structure having excellent electrical characteristics relating to the EMI characteristics of the space for the sliding occupied, is to provide a 及 beauty portable terminal device.

A coaxial cable connection structure according to the present invention that can achieve the above-described object is provided with a plurality of upper and lower substrates, which are electronic circuit boards that are arranged vertically and slide linearly , and are bundled at least at one location. A coaxial cable connection structure that is electrically connected by a coaxial cable harness including a coaxial cable,
Wherein the connection position to the substrate of the coaxial cable harness and the connecting position to the lower substrate is a different position in the direction perpendicular to the sliding direction, toward direction the coaxial cable harness you orthogonal previously kiss ride direction It is connected so that it may be bent and may become U shape as a whole.

The coaxial cable harness used in the present invention may not be entirely a coaxial cable, and may include an insulated wire that does not have an external conductor. In the present invention, since a coaxial cable can be used for the signal line, the electrical characteristics related to impedance matching and EMI characteristics are good. An insulated wire having no external conductor can be used as a feeder line or a ground line. When bundling these wires, it is not necessary to distinguish them from coaxial cables.
When both the boards are slid, the portion of the coaxial cable harness that is curved in a U shape moves to follow the movement of the boards. The space (sliding space) necessary for the sliding of the coaxial cable harness at this time has a height that is the thickness of the coaxial cable harness, and its width is the U-shaped width. When the coaxial cable harness has a flat shape with an elliptical cross section, the thickness can be reduced. As a result, the gap between the upper and lower substrates can be narrowed. Further, the U-shaped width can be overwhelmingly smaller than the width of the substrate. Therefore, it is possible to narrow the gap between the substrates and secure a sufficient sliding space for the coaxial cable harness.

In the coaxial cable connection structure according to the present invention, it is preferable that a common connector is attached to an end portion of at least a part of the coaxial cable harness, and the connector is connected to the upper substrate or the lower substrate. .
In the coaxial cable connection structure configured as described above, since the connector is attached to the end of the coaxial cable harness, the connection with the substrate can be easily performed. In addition, the terminal of at least one part of a coaxial cable harness refers to the terminal of a part (for example, 20 out of 40) of a plurality of coaxial cables included in the coaxial cable harness. The remaining terminals may have other connectors.

In the coaxial cable connection structure according to the present invention, the end of the coaxial cable harness is divided into a plurality of coaxial cable bundles, and a common connector is attached to the end of the coaxial cable for each bundle. Is preferably connected to the upper substrate or the lower substrate .
In the coaxial cable connection structure configured as described above, even if the number of coaxial cables increases, the width of the connector is not expanded by increasing the number of connectors without increasing the number of coaxial cables connected to one connector. Therefore, the degree of freedom in designing the location where the connector is connected on the board is improved.

In the coaxial cable connection structure according to the present invention, it is preferable that an end portion of the coaxial cable harness is directly attached to the upper substrate or the lower substrate.
In the coaxial cable connection structure configured as described above, the connection of the coaxial cable harness can be directly connected to the substrate without being limited to the connector.

In the coaxial cable connection structure according to the present invention, it is preferable that both ends of the coaxial cable harness are respectively connected to opposite sides in the width direction of the upper substrate and the lower substrate. For example, if one end of the coaxial cable harness is connected to the right side of the upper substrate, the other end is preferably connected to the left side of the lower substrate.
In the coaxial cable connection structure thus configured, a large bending radius of the coaxial cable can be ensured even if the thickness dimensions of the two substrates are small. Therefore, the gap between the two substrates can be reduced.

In the coaxial cable connection structure according to the present invention, each coaxial cable is preferably thinner than the AWG 42.
The coaxial cable connection structure configured as described above is rich in bendability because the coaxial cable has a small diameter, and can improve the slidability of both substrates. Further, the coaxial cable harness can be made thin when bundled, and the coaxial cable connection structure can be made thin.

In the coaxial cable connection structure according to the present invention, the coaxial cable is connected to at least one of the upper substrate and the lower substrate, or to at least one of the upper housing containing the upper substrate and the lower housing containing the lower substrate. It is preferable that an accommodating portion for accommodating the cable harness with a predetermined width is provided . The accommodating portion can be provided on each substrate or in a housing that accommodates each substrate. For example, a rectangular recess can be provided on at least one of the substrates. Alternatively, the housing portion surrounded by the wall can be formed by providing a protrusion in a rectangular shape on at least one of the substrates. Alternatively, a portion surrounded by a groove cut in the housing or a wall standing on the housing may be used as the housing portion.
The width of the accommodating portion can be obtained by adding the width of the coaxial cable harness to the bending diameter of the bundled coaxial cable harness. The sliding space of the coaxial cable harness can be limited to a very small size by cutting a groove or standing a wall so as to have this width. The sliding space is a space where no other parts can be placed. By reducing the sliding space, the entire device can be reduced. Alternatively, as the sliding space becomes smaller, another component can be arranged to enhance the function.

In the coaxial cable connection structure according to the present invention, the coaxial cable harness is preferably configured by bundling a plurality of bundles of a plurality of coaxial cables.
In the coaxial cable connection structure configured as described above, when a plurality of coaxial cables are bundled, the thickness of each bundle can be reduced by dividing the bundled bundles into a plurality of coaxial cables. The connection structure can be thinned.

In the coaxial cable connection structure according to the present invention, at least one end side of the coaxial cable harness, the longitudinal direction of the connector and the direction along the straight portion of the U-shape are not orthogonal, and the relative direction of the connector and the straight portion. In order to maintain the above, it is preferable that each coaxial cable from the bundled portion to the connector is bent and becomes longer toward the outside of the bend . The angle formed by the longitudinal direction of the connector and the direction along the straight portion of the U-shape is adjusted by the direction in which the connector is disposed on the board. For example, the longitudinal direction of the connector and the direction along the straight line portion of the U-shape can be made parallel.

In the coaxial cable connection structure according to the present invention, a ground bar is attached to an end portion of the coaxial cable harness directly attached to the substrate, and a longitudinal direction of the ground bar and a direction along the straight portion of the U-shape Are not orthogonal to each other, and in order to maintain the relative direction of the ground bar and the straight line portion, it is preferable that each coaxial cable from the bundled portion to the ground bar is bent and becomes longer toward the outside of the bend . Usually, the longitudinal direction of the ground bar is parallel to the arrangement direction of the electric wires at the end of the coaxial cable harness. In the coaxial cable connection structure configured as described above, the angle formed by the longitudinal direction of the ground bar and the direction along the straight line portion of the U-shape is adjusted by the direction in which the coaxial cables are arranged on the substrate. For example, the longitudinal direction of the ground bar can be made parallel to the direction along the U-shaped straight line portion.

In the coaxial cable connection structure according to the present invention, the coaxial cables are bundled within a range of 3 mm on both sides in the longitudinal direction of the coaxial cable harness with respect to the U-curved starting point in a state where both ends of the coaxial cable harness are closest to each other. It is preferable not to be.
In the coaxial cable connection structure according to the present invention, the coaxial cable is within a range of 3 mm on both sides in the longitudinal direction of the coaxial cable with respect to the U-shaped bending start point with both ends of the coaxial cable harness being farthest apart. Preferably they are not bundled. In the state where the both ends of the coaxial cable harness are farthest apart, it can be said that the coaxial cable harness is J-shaped, but the coaxial cable harness referred to in the present invention is U-shaped as a whole includes this.
When the coaxial cable harness is bent into a U shape, the bending force concentrates on both sides of the U-shaped bending start point. By not bundling these portions, it is possible to prevent damage such as the coaxial cable moving and releasing the bending load, and the conductor of the coaxial cable being cut. When the coaxial cable connection structure is used, since it is almost always the case that both end portions thereof are in the closest state or the most distant state, the coaxial cables are bundled in the vicinity of the U-shaped bending start point in those states. In most cases, the bending force applied to each coaxial cable can be released. By not bundling the range of 3 mm on both sides from the starting point of the U-shape, the number of reciprocating slides until the coaxial cable is broken when the substrates are slid and reciprocated repeatedly increases dramatically. Durability against bending is greatly improved. By not bundling a range of 5 mm on both sides from the U-shaped bending start point, durability against bending of the coaxial cable is further improved.

In the coaxial cable connection structure according to the present invention, it is preferable that the coaxial cables are intermittently bundled at a plurality of locations.
In the coaxial cable connection structure configured in this way, since a plurality of places that are not bundled are intermittently provided, the bending load applied to the coaxial cable can be easily released as a whole. The coaxial cable can be prevented from being damaged regardless of the bending position of the cable harness. Each coaxial cable should just be bundled intermittently so that it may not be separated.
The coaxial cable is bundled intermittently at intervals of 6 mm or more, so that the bending load can be easily released. When the coaxial cables are bundled intermittently at intervals of 10 mm or more, the bending load is more easily released. It can be.

In the coaxial cable connection structure according to the present invention, the coaxial cable is preferably bundled by being wound around a spiral with a thread or tape with a gap therebetween.
In the coaxial cable connection structure configured as described above, it is possible to easily release the bending load applied to the coaxial cable as in the structure in which the cables are intermittently bundled at a plurality of locations.

In the coaxial cable connection structure according to the present invention, it is preferable that the coaxial cable is bundled with a spiral tape that is stored in a cylindrical shape with a gap.
In the coaxial cable connection structure configured as described above, it is possible to easily release the bending load applied to the coaxial cable as in the structure in which the cables are intermittently bundled at a plurality of locations. Further, since the shape is stored in a cylindrical shape, it is easy to maintain a bundled state.
The tape can be either adhesive and bonded to the coaxial cable, or non-adhesive, but the load is more likely when the coaxial cable slides against the tape and moves in the longitudinal direction when bent. From the viewpoint of easy escape, a tape that does not adhere is preferable.

In the coaxial cable connection structure according to the present invention, the coaxial cable is preferably covered and bundled with a cylindrical braided sleeve.
In the coaxial cable connection structure configured as described above, the coaxial cable can be bundled in a state in which it can easily move in the longitudinal direction without bonding the coaxial cable like an adhesive tape. Further, the sleeve itself can be flattened, the bundled portions can be flattened to reduce the thickness of the bundle, and the coaxial cable connection structure can be thinned.

Coaxial cable harness that is used to a coaxial cable connection structure according to the upper Symbol invention, as a coaxial cable harness for connecting the substrate to relatively move, mechanical reliability relating to bendability, required for the device Excellent electrical characteristics related to space reduction, impedance matching and EMI characteristics.

A mobile terminal device according to the present invention includes the coaxial cable connection structure according to the present invention, and the mobile terminal device has an upper housing and a lower housing that are arranged one above the other and slide linearly, An upper substrate is housed in the upper housing, and the lower substrate is housed in the lower housing .
The portable terminal device configured as described above is small and high-density information processing by applying the above-described coaxial cable connection structure to the connection of the substrate that is mounted on the portable terminal and slides relatively. It is something that can be done.

Further, coaxial cable connection structure that written to the present invention can be combined as appropriate to the preferred embodiment described above.

  In the coaxial cable connection structure of the present invention, when the upper and lower substrates are slid, the coaxial cable harness that connects the two substrates is excellent in mechanical reliability related to bendability, and there is a space for sliding following the slide of the upper and lower substrates. The effect of being small and excellent in electrical characteristics related to impedance matching and EMI characteristics can be obtained. According to the present invention, the gap between the two substrates can be made smaller than in the case where the FPC is used to connect the two substrates that are stacked one above the other and slide.

(A) is a top view which shows 1st Embodiment which concerns on the coaxial cable connection structure of this invention. (B) is a side view. (A) is a top view which shows the state which accumulated the upper and lower board | substrates. (B) is a side view. (A) is a top view which shows the state which attached the connector to the edge part of a coaxial cable harness. (B) is a side view. (C) is a cross-sectional view. (A) is a top view which shows the state which divided | attached and attached the connector to the edge part of a coaxial cable harness in 2 rows. (B) is a side view. (C) is a cross-sectional view. (A) And (B) is a perspective view which shows the example of an accommodating part. (A) is a perspective view which shows the state which expanded the mobile telephone to which the coaxial cable connection structure concerning this invention was applied. (B) is a perspective view showing a state in which mobile phones are stacked. (A) is a top view which shows the state which accumulated the both board | substrates with which the coaxial cable connection structure which concerns on this invention was applied 2 systems. (B) is a top view which shows the state which made both board | substrates slide. (A) is sectional drawing which shows the state which directly attached the coaxial cable harness to the single side | surface of a board | substrate. (B) is sectional drawing which shows the state which attached the coaxial cable harness directly to both surfaces of the board | substrate. It is a top view which shows the coaxial cable harness which bundled the coaxial cable intermittently. It is a top view which shows the state which divided the coaxial cable harness into two bundles, and was connected to one connector. It is a top view which shows the example to which the longitudinal direction of the connector attached to the edge part of a coaxial cable harness and the direction along a U-shaped linear part orthogonally crossed. It is a top view which shows the example to which the longitudinal direction of the ground bar attached to the edge part of a coaxial cable harness and the direction in alignment with a U-shaped linear part orthogonally crossed. It is a top view which shows the example in which the both ends of the longitudinal direction with respect to a U-shaped curve starting point are not bundled in the state where the both ends of the coaxial cable harness are closest. It is a top view which shows the example by which the both ends of the longitudinal direction with respect to a U-shaped curve starting point are not bundled in the state which the both ends of the coaxial cable harness were most separated. It is a top view which shows the coaxial cable harness which bundled the coaxial cable helically with the tape. It is a top view which shows the coaxial cable harness which bundled the coaxial cable spirally with the thread | yarn. It is a top view which shows the coaxial cable harness which bundled the coaxial cable with the helical tape. It is a top view which shows the coaxial cable harness which bundled the coaxial cable with the braided sleeve. It is a side view which shows the wiring structure using a flexible substrate.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Coaxial cable connection structure, 11 ... Upper board | substrate, 12 ... Lower board | substrate, 13 ... Accommodating part, 13a ... Recessed part (accommodating part), 13b ... Protrusion (accommodating part), 20 ... Coaxial cable harness, 21a, 21b ... End part 23 ... Bundle tape (tape), 24 ... Coaxial cable, 25, 25a, 25b ... Connector, 26 ... Ground bar, 27 ... Yarn, 28 ... Spiral tape, 29 ... Braided sleeve, 30 ... Mobile phone (mobile terminal) Equipment), 31 ... upper housing, 32 ... lower housing.

Hereinafter, an example of an embodiment according to the present invention will be described in detail based on the drawings.
As shown in FIGS. 1 and 2, the coaxial cable connection structure 10 of the present embodiment includes a plurality of two substrates 11 and 12 that are arranged one above the other and slide forward and backward (left and right in FIGS. 1 and 2). A coaxial cable harness 20 including 20 (20 to 60) coaxial cables 24 is connected. The coaxial cable harness 20 is formed by bundling a plurality of coaxial cables 24 except for both end portions 21a and 21b, and is connected to both substrates so as to be U-shaped as a whole. Thereby, the coaxial cable harness 20 can be wired between both the boards 11 and 12 in a U-shape in the plan view direction of the boards 11 and 12. As another form different from FIGS. 1 and 2, the coaxial cable 24 may be intermittently bundled in the longitudinal direction. 1 shows a state in which both end portions 21a and 21b of the coaxial cable harness 20 are farthest from each other, and FIG. 2 shows a state in which both end portions 21a and 21b are closest to each other. The slide stroke of the substrates 11 and 12 is, for example, about 30 mm to 60 mm.

  The coaxial cable 24 has a configuration in which a central conductor, an inner insulator, an outer conductor, and a jacket are provided from the center toward the outer side in a radial section orthogonal to the central axis, and ends at the end portions 21a and 21b. As a result of the treatment, the outer conductor, the inner insulator, and the central conductor are exposed step by step in a predetermined length. The coaxial cable harness 20 may include an insulated cable having no external conductor in addition to a plurality of coaxial cables. In the drawing, the number of coaxial cables 24 is reduced and simplified.

  The coaxial cable harness 20 is bent in the width direction of the substrate (in the direction of a double-headed arrow W in FIG. 1A) as seen in a plan view. Since the width of the substrate is several centimeters, a sufficient bending diameter in this direction can be secured. For example, as shown in FIG. 1A, if one end 21a of the coaxial cable harness 20 is connected to the right side (upper side in FIG. 1) of the upper substrate 11 in the sliding direction, the other end 21b is connected to the left side (lower side in FIG. 1) of the lower substrate 12 with respect to the sliding direction. The coaxial cable harness 20 is bent in a U-shape, but in order to reduce the space for housing the coaxial cable harness 20 (see the accommodating portion 13 in FIG. 5), the width of the U-shape (interval between the straight portions) is reduced. Narrower is better.

  By bending the coaxial cable 20 substantially along the plane of the substrates 11 and 12, a sufficient bending radius can be secured for the coaxial cable harness 20. When the conventional FPC is used, the FPC is bent between the two substrates 11 and 12, and thus it is necessary to increase the gap between the two substrates 11 and 12 in order to secure the bending diameter. It is not necessary to make the gap between the substrates 11 and 12 large as in the case of using an FPC, and the device can be thinned.

  As shown in FIGS. 3A and 3B, the coaxial cable harness 20 is formed by bundling a plurality of coaxial cables 24 with a bundle tape 23. For example, as shown in FIG. It is desirable to make the thickness dimension h1 such as a cross section as small as possible. A bundle tape 23, for example, a fluororesin tape, a PET tape, a rubber material, or the like is spirally wound around a plurality of coaxial cables 24 to form the coaxial cable harness 20. The bundle tape 23 can be wound around the whole except for both end portions 21a and 21b, but can also be bundled intermittently as shown in FIG. A tape or the like is preferably wound around the substrate 11, 12 or the wall surface of the housing portion 13 (see FIG. 5) and bundled, whereby the durability of the coaxial cable harness 20 against friction is improved. Bundle tape with a low coefficient of friction (for example, fluororesin tapes such as PTFE, PFA, FEP, ETFE, etc.) with a low friction coefficient in terms of slidability with the wall surface of the housing, etc. In terms of sex, it is better to bundle them intermittently. Instead of winding the bundle tape 23 in a spiral shape, it is possible to cover the tube as shown in FIG.

  As the coaxial cable 24, for example, it is desirable to use an ultrafine coaxial cable thinner than the AWG 42 according to the AWG (American Wire Gage) standard. Thereby, the coaxial cable harness 20 is easy to bend, and the resistance when both the boards 11 and 12 slide can be reduced. Further, when the coaxial cable harness 20 is formed by bundling a plurality of coaxial cables 24, the thickness h1 of the coaxial cable harness 20 (see FIG. 3C) can be reduced, and the coaxial cable connection structure 10 can be formed. Can be made thinner. For example, since the outer diameter of the AWG 42 ultra-fine coaxial cable is about 0.3 mm, the thickness of the coaxial cable harness is within 2 mm even if there are six layers in the height direction. On the other hand, in the FPC, as shown in FIG. 5 of Patent Document 1 (FIG. 19 attached to the present specification), the height of the gap between the substrates is set to 3 mm or more in order to bend the FPC so that the FPC is folded in two. Must be secured. That is, the coaxial cable connection structure 10 using the coaxial cable harness 20 of the present embodiment has a gap between the two substrates 11 and 12 as compared with the case where the FPC is used to connect the two substrates 11 and 12 that are stacked one above the other and slide. Can be reduced.

  The coaxial cable harness 20 includes 20 to 60 coaxial cables 24. When the coaxial cable 24 is a thin AWG 42 and the coaxial cable harness 20 is composed of 20 coaxial cables 24, the outer diameter (thickness) of the coaxial cable harness 20 is formed as a bundle having a cross section close to a circle. ) Is about 1.7 mm, and when the coaxial cable harness 20 is arranged in a U-shape, the width of the U-shape can be kept within 5 mm. Although the width of the U-shape increases as the number of cores (the number of coaxial cables 24) increases, even if 60 coaxial cables 24 of the AWG 42 are bundled, the width of the U-shape can be within 10 mm. Note that the coaxial cable harness 20 including 40 or more coaxial cables 24 is used for a device having a large amount of information to be transmitted.

  Further, as shown in FIG. 4, the coaxial cable harness 20 is formed by winding a plurality of (here, two) bundles 20a and 20b in which a plurality of coaxial cables 24 are bundled, and further winding a bundle tape 23. can do. Thereby, as shown in FIG. 4C, the thickness h2 (<h1) of the coaxial cable harness 20 can be further reduced, and the coaxial cable connection structure 10 can be made thinner. This configuration is particularly effective because the thickness of the bundle does not increase even if the number of the coaxial cables 24 increases.

  As shown in FIGS. 1 to 3, it is desirable to attach a connector 25 to one end or both ends of the coaxial cable harness 20 to facilitate connection to the boards 11 and 12. When the coaxial cable harness 20 is formed into a plurality of bundles, when the terminal of the coaxial cable 24 is attached to a connector, the coaxial cable harness 20 is divided into two as shown in FIG. 4, and connectors 25a and 25b common to the respective bundles 20a and 20b are provided. Can be attached. In FIG. 4, the lengths of the two bundles 20a and 20b are different, but they may be almost the same length. As shown in FIG. 10, the two bundles 20 a and 20 b can be connected to one common connector 25. Both the bundles 20a and 20b can be connected to one connector without further bundling.

  As shown in FIG. 5, it is desirable that the boards 11 and 12 are provided with a housing portion 13 that houses the coaxial cable harness 20 with a predetermined width. For example, as shown in FIG. 5A, a rectangular recess 13 a can be provided as the accommodating portion 13. As a result, the U-shaped deformation of the coaxial cable harness 20 accompanying the relative sliding of both the boards 11 and 12 is caused to occur in the housing portion 13, so that the electric cable in which the coaxial cable 24 is mounted on the boards 11 and 12. It is possible to prevent the coaxial cable harness 20 from coming into contact with or catching on components, electrical components in the vicinity of the boards 11 and 12, and the like. Moreover, both the boards 11 and 12 can slide smoothly. Alternatively, as shown in FIG. 5 (B), the projections 13b can be provided on the substrates 11 and 12 in a rectangular shape, for example, so that the accommodating portion 13 surrounded by the walls can be formed.

6A is a perspective view illustrating a state in which a slide type mobile phone is extended as an example of the mobile terminal device, and FIG. 6B is a perspective view illustrating a state in which the slide type mobile phone is closed.
The above-described coaxial cable connection structure 10 is applied to the mobile phone 30 shown in FIG. This mobile phone 30 has an upper housing 31 and a lower housing 32 that can slide with each other, and the above-described substrates 11 and 12 are mounted on both housings 31 and 32, respectively, and they are coaxial. They are connected by a cable harness 20.

  In the cellular phone 30 configured in this way, the mechanical reliability and electrical characteristics of the coaxial cable connection structure are compatible. In addition, it is possible to make the mobile phone 30 thinner by thinning the gap between the two substrates. According to the present invention, the sliding stroke of such a slide-type mobile phone is 30 to 60 mm, preferably about 40 mm, the distance between the upper and lower substrates is 2 mm or less, and the wiring accommodating portion necessary for electrical connection between the substrates is provided. The width can be 20 mm or less, and further 10 mm or less.

The coaxial cable connection structure 10 of the present invention and the coaxial cable harness 20 used therefor are not limited to the embodiment described above, and appropriate modifications and improvements can be made. In addition, the same code | symbol is attached | subjected to the site | part which is common in the site | part mentioned above, and the overlapping description is abbreviate | omitted.
For example, in the above-described embodiment, the case where the upper and lower substrates 11 and 12 are connected by one coaxial cable harness 20 is illustrated. However, as shown in FIG. The substrates 11 and 12 can also be connected. 7A is a plan view showing a state in which the overlap between the substrates 11 and 12 is maximized (closed state), and FIG. 7B is a state in which the overlap between the substrates 11 and 12 is minimized (opened). FIG. The locations where the connectors 25a, 25b are connected to the boards 11, 12 can be any locations on the boards 11, 12 as long as the coaxial cable harness 20 can be U-shaped.

In the above-described embodiment, the case where the connectors 25 (25a, 25b) are attached to the end portions 21a, 21b of the coaxial cable harness 20 has been described. However, as shown in FIG. It is also possible to attach 24 directly to the substrates 11 and 12. When the coaxial cable 24 is directly attached to the boards 11 and 12, the central conductor at the end of the coaxial cable 24 may be connected to the connection terminals of the boards 11 and 12 by soldering. It can also be directly attached to one side of the substrates 11 and 12 (FIG. 8A), and can be directly attached to both sides (FIG. 8B) when directly attached to the ends of the substrates 11 and 12. When connecting to the upper substrate 11, it is attached to the lower surface, and when connecting to the lower substrate 12, it is attached to the upper surface. When connecting to the boards 11 and 12 not only by direct attachment but also by a connector or the like, it can be connected to both sides of the boards 11 and 12.
Moreover, the coaxial cable harness of this invention can be mixed with the insulated wire which does not have an external conductor suitably. The insulated wire can be used as a ground, or the insulated wire can be used as a feeder line.

  Further, in the above-described embodiment, the orientation of the coaxial cable 24 at the connection location of the coaxial cable harness 20 to the boards 11 and 12 (directly attached to the connector 25 and the board) is the U-shaped straight portion of the coaxial cable harness 20. The direction of the coaxial cable 24 at the connection point may be different from the direction of the U-shaped straight portion of the coaxial cable harness 20.

For example, as shown in FIG. 11, the longitudinal direction of the connector 25 attached to the end portions 21a and 21b of the coaxial cable harness 20, and the direction along the U-shaped straight portion of the coaxial cable harness 20 (the left-right direction in FIG. 11) May not coincide with each other and may coincide with each other.
Also, for example, as shown in FIG. 12, the end portions 21a and 21b of the coaxial cable harness 20 are directly attached to the substrates 11 and 12, and the longitudinal direction of the ground bar 26 attached to each of the end portions 21a and 21b, The direction (the left-right direction in FIG. 12) along the U-shaped straight portion of the coaxial cable harness 20 may not be orthogonal but may coincide. The ground bar 26 is connected in common to the external conductor exposed by terminating each coaxial cable 24 and is further connected to the ground terminals of the substrates 11 and 12.

In the case shown in FIG. 11 or FIG. 12, the direction of the coaxial cable 24 at the connection point is orthogonal to the direction of the U-shaped straight portion of the coaxial cable harness 20, but this is only an example, and the end portions 21a and 21b The angle at which each cable 24 is bent is arbitrary. However, in order for each cable 24 to be bent at 30 degrees or more with the direction (the U-shaped linear direction of the harness) at the ends 21a and 21b, the connector 25 or the ground bar 26 and the U-shaped straight line In order to maintain the relative direction of the portions, the length of each coaxial cable 24 from the bundled portion to the connector 25 or the ground bar 26 is adjusted. Thereby, the length of each coaxial cable 24 at the end portions 21a and 21b becomes longer as it is located outside the bend. In one form of the coaxial cable harness of the present invention, the direction of the connector 25 or the ground bar 26 relative to the boards 11 and 12, that is, the end of the coaxial cable harness 20 is desired by adjusting the length of each cable in this way. The direction can be The angle and direction for attaching the coaxial cable harness 20 on the substrate can be freely designed. That is, the design freedom of the substrates 11 and 12 is improved.
The coaxial cable harness 20 of this form is prepared when each coaxial cable 24 having a required length calculated by the angle at which the coaxial cable 24 is bent at the end is prepared and the connector 25 or the ground bar 26 is attached to each coaxial cable 24. The coaxial cables 24 are arranged in accordance with the determined length. The coaxial cables 24 whose positions are determined by attaching the connector 25 or the ground bar 26 are bundled with a tape or the like.
As shown in FIG. 4, even when a plurality of connectors 25 are attached to one end of one coaxial cable harness 20, the longitudinal direction of each connector 25 or each ground bar 26 is in the direction along the U-shaped straight portion of the coaxial cable harness 20. Even if the length of each coaxial cable 24 from the place where each cable 24 is bundled to the connector is adjusted in order to maintain the relative direction of the connector 25 or the ground bar 26 and the straight line portion without being orthogonal to each other, Good.
When the coaxial cable 24 is divided into a plurality of groups at one end of one coaxial cable harness 20 and a connector 25 or a ground bar 26 is attached to each group, or the coaxial cable harness 20 further bundles a bundle of the plurality of coaxial cables 24. The same applies to the case where the connector 25 and the ground bar 26 are attached to each bundle.

  In the above-described embodiment, the form in which the portions other than the end portions 21a and 21b of the coaxial cable harness 20 are bundled with the bundle tape 23 is illustrated. However, the form in which the coaxial cable 24 is bundled is not limited thereto. The coaxial cables 24 do not have to be bundled so as to cover the whole, but may be partially bundled to such an extent that the harness shape can be maintained when the substrates 11 and 12 are slid. It is preferable to improve durability against friction by winding a tape or the like where the coaxial cable 24 comes into contact with the substrates 11 and 12 or the wall surfaces provided on the substrates 11 and 12 when the substrates 11 and 12 are slid. In addition, the bundle tape 23 may be one having adhesiveness and bonded to the coaxial cable 24 or non-adhesive, but when bent, the coaxial cable 24 slides relative to the bundle tape and moves in the longitudinal direction. Non-adhesiveness is preferred because it is easier to release the load caused by bending.

The coaxial cable harness 20 is connected to the upper and lower boards 11 and 12, and the position where the overlap between the boards 11 and 12 is maximized (the state shown in FIG. 2) is the position where the overlap between the boards 11 and 12 is minimized (FIG. 1). The state in which the substrates 11 and 12 are slid and returned to each other was repeated, and the relationship between the number of times of reciprocating the slide (hereinafter referred to as the number of times of sliding) and the disconnection of the central conductor of the coaxial cable 24 was examined. As a result, it was found that if the coaxial cable 24 is not bundled in the vicinity of the bending start point of the coaxial cable 24 (boundary point between the straight line portion and the curved portion in the U-shape), the number of sliding times until disconnection is dramatically improved. Experiments have shown that it is preferable not to bundle the coaxial cable 24 in the range of 3 mm on both sides across the bending origin, and it is more preferable not to bundle the coaxial cable 24 in the range of 5 mm on both sides.
The reason is considered as follows.
When the coaxial cable harness 20 is bent, a difference in length occurs between the inside and the outside of the curved portion. If each coaxial cable 24 can move freely at that time, the inner coaxial cable 24 loosens and absorbs the difference in length.
However, when the coaxial cables 24 are bundled by wrapping tape or the like, the coaxial cables 24 are restrained and cannot move or are difficult to move, cannot absorb the difference in length, and bending stress is applied to the coaxial cable 24 at both ends of the curved portion. It will take. That is, the bending load tends to concentrate on the bending start point of the coaxial cable 24 (the boundary point between the straight portion and the curved portion in the U shape). It is also conceivable that the central conductor or the like of the coaxial cable 24 is broken at a location where loads due to bending stress are concentrated by sliding the substrates 11 and 12 many times. For this reason, it is better not to bind the coaxial cable 24 without restraining the portion where bending stress is likely to occur, that is, in the vicinity of the bending start point.

  Since the mobile phone is usually in either a closed state (shortened state) or an open state (extended state), the substrates 11 and 12 used in the mobile phone 30 or the like. Then, normally, both ends 21a and 21b of the coaxial cable harness 20 are in a state of being closest or in a state of being most apart. This state is either a state where both ends 21a, 21b of the coaxial cable harness 20 are closest as shown in FIG. 13 or a state where both ends 21a, 21b of the coaxial cable harness 20 are farthest away as shown in FIG. It is. Therefore, as shown in FIG. 13 or FIG. 14, if the coaxial cable 24 is not bundled in the vicinity of the U-shaped bending starting points A and B, the bending stress of the coaxial cable harness 20 is hardly received. The characteristics (the number of times of sliding until disconnection) can be dramatically improved.

For example, when the coaxial cable harness 20 is formed by using the coaxial cables 24 of the AWGs 42 to 46, if the entire extra length 22 is bundled with the bundle tape 23, the substrates 11 and 12 are slid about 50,000 times. The central conductor of the coaxial cable 24 will break. When the range in which the coaxial cable 24 is not bundled is a range of 3 mm on both sides in the longitudinal direction with respect to the U-shaped bending starting points A and B, the central conductor of the coaxial cable 24 is obtained even if the substrates 11 and 12 are slid 100,000 times. Is not broken and the unbundled range is 5 mm on both sides in the longitudinal direction with respect to the bending origins A and B, the central conductor of the coaxial cable 24 does not break even if the substrates 11 and 12 are slid 150,000 times. .
In order to maintain the harness shape of the coaxial cable harness 20, it is preferable that a part of the curved portion in the U-shape is bundled with a bundle tape 23 or the like in the state shown in FIGS.
The form in which the vicinity of the bending start point is not bundled includes the case where the end of the coaxial cable harness 20 is attached to the connector and the case where it is directly attached to the board. Furthermore, the case where each coaxial cable 24 is divided into several groups at the end of the coaxial cable harness 20 and each group is attached with a connector or a ground bar is included. Furthermore, a case where a bundle of a plurality of coaxial cables 24 is further bundled to form the coaxial cable harness 20 is included.

Further, as shown in FIG. 9, when the coaxial cable 24 is intermittently bundled at a plurality of locations, the unbundled locations are intermittently provided at a plurality of locations. The load can be easily released as a whole, and damage to the coaxial cable 24 can be prevented regardless of the bending position of the coaxial cable harness 24. Further, by intermittently bundling the coaxial cable 24, it is easy to realize a form in which the vicinity of the bending start point is not bundled in both the state where the both end portions 21a, 21b of the coaxial cable harness 20 are closest to each other.
Each coaxial cable 24 should just be bundled intermittently to such an extent that it does not spread in order to maintain a harness shape. As described above, it is preferable not to bundle in the range of 3 mm across the bending start point. Therefore, the interval when intermittently bundling is preferably 6 mm or more. Furthermore, it is preferable to be bundled intermittently at intervals of 10 mm or more. In FIG. 9, although the form bundled with the bundle tape 23 was shown, you may bundle with a thread | yarn and you may bundle so that an adhesive agent may be dripped and integrated.

  As shown in FIGS. 15 and 16, the coaxial cable 24 may be bundled with a bundle tape 23 (see FIG. 15) or a thread 27 (see FIG. 16) wound spirally with a gap therebetween. . In the coaxial cable harness 20 of FIGS. 15 and 16, it is possible to easily release the bending load applied to the coaxial cable 24 as in the structure in which the cables are intermittently bundled at a plurality of locations as shown in FIG. 9. In addition, it is good to bundle with the bundle tape 23 which has adhesiveness in the both ends of the location wound helically with the bundle tape 23 or the thread | yarn 27 so that winding looseness may not arise.

  Further, as shown in FIG. 17, the coaxial cable 24 may be bundled with a spiral tape 28 that has a shape stored in a cylindrical shape with a gap therebetween. As the spiral tape 28, a belt-shaped bundle tape 23 can be attached in a cylindrical shape and stored in shape, or a cylindrical member formed with a spiral cut can be used. For example, a rubber tube cut into a spiral shape can be used. In the coaxial cable harness 20 of FIG. 17, it is possible to easily release the bending load applied to the coaxial cable 24 as in the structure in which the cables are intermittently bundled at a plurality of locations as shown in FIG. 9. Further, since the spiral tape 28 is stored in a cylindrical shape, it is easy to maintain a state where the coaxial cables 24 are bundled. Even in the case of bundling, the working efficiency is higher when the tape or the tube having the shape memorized is covered with the coaxial cable 24 than when the tape or the yarn is wound at a predetermined pitch.

  Further, as shown in FIG. 18, the coaxial cable 24 may be covered with a tubular braided sleeve 29 and bundled. As the braided sleeve 29, for example, a metal foil yarn or chemical fiber braided in a cylindrical shape may be used. In the coaxial cable harness 20 of FIG. 18, the coaxial cable 24 can be bundled in a state in which it can easily move in the longitudinal direction without bonding the coaxial cable 24 like an adhesive tape. Further, if the sleeve itself has a flat shape, the bundled portion can be easily flattened as shown in FIG. 3C, and the accommodation space can be reduced. For example, when the bundle tape 23 is wound around a coaxial cable 24 bundled in a circular cross-section with a diameter of 1.9 mm, the outer diameter becomes 2.3 mm. The width is 2.6 mm. On the other hand, when the coaxial cable 24 bundled in a circular cross section with a diameter of 1.9 mm is covered with the braided sleeve 29, the outer diameter becomes 2.1 mm, and when pressed and flattened, the height becomes 1.3 mm. The width is 2.8 mm.

9 and 15 to 18, when the direction of the length direction of the connector 25 is parallel to the length direction of the coaxial cable 24 (direction along the straight line portion of the U-shape), that is, each coaxial cable 24 is 90 at the end. An example of bending is shown. In these cases, as described above, the lengths of the respective coaxial cables 24 are different, and the lengths of the respective coaxial cables 24 from the bundled portion to the connector 25 are adjusted. Moreover, the direction of the connector 25 is not limited to the above-mentioned figure. The length direction of the connector 25 may be orthogonal to the length direction of the coaxial cable 24.
In the coaxial cable harness 20 in which the end portions are not attached but are grounded and directly attached to the board, the way to bundle the coaxial cables 24 is the same as in the case where the end portions are attached.
In addition, said embodiment can be combined suitably. For example, the connector 25 may be attached to one end 21 a of the coaxial cable harness 20 and connected to the substrate 11, and the other end 21 b may be directly attached to the substrate 12. Further, for example, as shown in FIGS. 11 and 12, the direction of the coaxial cable 24 at the connection point is made different from the direction of the U-shaped straight portion of the coaxial cable harness 20, and FIGS. Various bundling forms shown in the above can also be adopted as appropriate.

  As described above, the present invention has two substrates connected so as to be slidable, and is useful as a coaxial cable connection structure or the like in which these substrates are electrically connected using a coaxial cable. It can be used for mobile phones.

  Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. This application is based on a Japanese patent application filed on May 23, 2006 (Japanese Patent Application No. 2006-143382), the contents of which are incorporated herein by reference.

Claims (18)

Coaxial cable connection structure that is electrically connected by a coaxial cable harness including a plurality of coaxial cables in which an upper substrate and a lower substrate, which are electronic circuit boards that are arranged vertically and slide linearly , are bundled at least at one location. Because
Wherein the connection position to the substrate of the coaxial cable harness and the connecting position to the lower substrate is a different position in the direction perpendicular to the sliding direction, toward direction the coaxial cable harness you orthogonal previously kiss ride direction A coaxial cable connection structure characterized by being bent so as to be connected in a U-shape as a whole. The coaxial cable according to claim 1 , wherein a common connector is attached to an end portion of at least a part of the coaxial cable harness, and the connector is connected to the upper substrate or the lower substrate. Connection structure. The end of the coaxial cable harness is divided into a plurality of coaxial cable bundles, and a common connector is attached to the end of the coaxial cable for each bundle, and each connector is connected to the upper board or the lower board. The coaxial cable connection structure according to claim 1 , wherein the coaxial cable connection structure is provided. The coaxial cable connection structure according to claim 1, wherein an end portion of the coaxial cable harness is directly attached to the upper substrate or the lower substrate. 2. The coaxial cable connection structure according to claim 1, wherein both ends of the coaxial cable harness are respectively connected to opposite sides in the width direction of the upper substrate and the lower substrate.   The coaxial cable connection structure according to claim 1, wherein each of the coaxial cables is narrower than the AWG. Accommodating the coaxial cable harness with a predetermined width in at least one of the upper substrate and the lower substrate, or in at least one of the upper housing accommodating the upper substrate and the lower housing accommodating the lower substrate. The coaxial cable connection structure according to claim 1, wherein a portion is provided .   The coaxial cable connection structure according to claim 1, wherein the coaxial cable harness is configured by bundling a plurality of bundles of a plurality of coaxial cables. At least one end of the coaxial cable harness, the longitudinal direction of the connector and the direction along the U-shaped linear portion are not orthogonal to each other, and the portions are bundled to maintain the relative direction of the connector and the linear portion The coaxial cable connection structure according to claim 2, wherein each of the coaxial cables from the connector to the connector is bent and becomes longer toward the outside of the bend . A ground bar is attached to an end of the coaxial cable harness directly attached to the substrate, and the longitudinal direction of the ground bar and the direction along the straight line portion of the U-shape are not orthogonal to each other. 5. The coaxial cable connection according to claim 4, wherein each of the coaxial cables from the bundled portion to the ground bar is bent and becomes longer toward the outside of the bend in order to maintain the relative direction of the straight portion. Construction.   The coaxial cables are not bundled within a range of 3 mm on both sides in the longitudinal direction of the coaxial cable harness with respect to the U-shaped bending start point in a state where both ends of the coaxial cable harness are closest to each other. The coaxial cable connection structure according to 1.   The coaxial cable is not bundled within a range of 3 mm on both sides in the longitudinal direction of the coaxial cable harness with respect to the U-shaped bending start point in a state where both ends of the coaxial cable harness are farthest apart. The coaxial cable connection structure according to 1.   The coaxial cable connection structure according to claim 1, wherein the coaxial cables are intermittently bundled at a plurality of locations.   The coaxial cable connection structure according to claim 13, wherein the coaxial cables are bundled intermittently at intervals of 6 mm or more.   The coaxial cable connection structure according to claim 1, wherein the coaxial cable is bundled by being wound around a spiral with a thread or a tape to form a gap.   2. The coaxial cable connection structure according to claim 1, wherein the coaxial cable is bundled with a gap formed by a spiral tape having a shape memory.   The coaxial cable connection structure according to claim 1, wherein the coaxial cable is covered and bundled by a cylindrical braided sleeve. A portable terminal device comprising the coaxial cable connection structure according to any one of claims 1 to 17 ,
The mobile terminal device has an upper housing and a lower housing that are arranged one above the other and slide linearly,
A mobile terminal device in which the upper substrate is housed in the upper housing and the lower substrate is housed in the lower housing .

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