JP2008113209A - Portable radio equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make portable radio equipment which has an antenna inside more compact and thinner. <P>SOLUTION: The portable radio equipment 1 according to the present invention includes a circuit board 70 which has a reference potential pattern and electronic components, and a case body 60 having a conductive first case part 62 which is disposed covering the electronic components and electrically connected to the reference potential pattern and a nonconductive second case part 64 which is disposed successively to the first case part 62 and disposed at an outer edge of the circuit board 70. An antenna element 66 is disposed at a part of a flexible wiring board 50 which is stacked and disposed on the second case part 64. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable wireless device equipped with an antenna such as a mobile phone having a built-in antenna, a PHS (Personal Handyphone System), a PDA (Personal Digital Assistant), a portable navigation device, and a notebook personal computer.

  Conventionally, a cellular phone as a portable wireless device has a structure in which an antenna is attached to the outside of a casing. However, in recent years, a structure in which an antenna is built in a housing is being adopted for reasons of design and the like.

  In addition, when a wireless communication terminal such as a mobile phone supports EV-DO, which is a type of CDMA2000 as a communication method, dual band + GPS (global positioning system), Bluetooth, which is a type of short-range wireless communication method, and the like. It is necessary to provide two or more antennas. Even in such a case, it is preferable to adopt a structure in which the antenna is built in the housing.

As described above, portable wireless devices such as mobile phones are becoming mainstream with a built-in antenna in a housing. As a portable radio device incorporating such an antenna, for example, a mobile phone in which a battery, a circuit board, a shield case, a flexible wiring board, and a key sheet are sequentially stacked in a casing and the antenna is disposed in an end of the casing. Can be illustrated (see Patent Document 1).
JP 2006-67524 A

  Incidentally, in recent years, portable wireless devices such as mobile phones have been required to be further reduced in size and thickness, but conventional configurations have not been sufficient.

  One object of the present invention is to achieve further miniaturization and thickness reduction in a portable wireless device incorporating an antenna.

  A portable wireless device of the present invention includes a circuit board having a reference potential pattern and an electronic component, a conductive first case portion that is disposed so as to cover the electronic component, and is electrically connected to the reference potential pattern, and the first A case body having a non-conductive second case section disposed continuously with one case section and disposed on an outer edge of the circuit board; and the first body section on a side opposite to the circuit board side of the case body. A wiring board stacked from one case part to the second case part; and a housing that houses the circuit board, the case body, and the wiring board, and is laminated on the second case part of the wiring board. An antenna element is disposed in the disposed portion.

  It is preferable that a plurality of key switches are provided at least in a portion of the wiring board that is stacked on the first case portion, and a key sheet is provided between the housing and the key switch.

  The plurality of key switches are preferably arranged from the first case part to the second case part.

  In addition, it is preferable that the first case portion and the second case portion are configured as separate members and are integrated by being engaged with each other.

  In the case body, it is preferable that the first case portion and the second case portion are integrally formed of a resin, and a portion constituting the first case portion is covered with a conductor film.

  In addition, a feeding point capable of supplying power to the antenna element is disposed on the back surface of the circuit board opposite to the surface on which the electronic component is disposed, and on one end side of the surface of the wiring board on the case body side. Is connected to the feeding point and connected to the antenna element, and is extended to the back side of the circuit board so that a portion of the wiring board including the connection part is bent. It is preferable that the connecting portion and the feeding point are connected.

  ADVANTAGE OF THE INVENTION According to this invention, the freedom degree of design in a portable radio | wireless machine can be raised, and size reduction and thickness reduction can be achieved.

  Embodiments of the present invention will be described below with reference to the drawings. In the following, a mobile phone will be described as a portable wireless device, but the present invention is not limited to this, and a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), a portable navigation device, a notebook personal computer, etc. It may be another portable wireless device equipped with an antenna.

  FIG. 1 is an external perspective view of a mobile phone 1 according to an embodiment of the present invention. As shown in FIG. 1, the mobile phone 1 is a foldable mobile phone 1, and includes a rectangular and thin operation unit side body 21 and a rectangular and thin display unit side body 22. .

  The upper end portion of the operation unit side body 21 and the lower end portion of the display unit side body 22 are connected via a hinge mechanism 26 so as to be opened and closed. The cellular phone 1 relatively rotates (rotates) the operation unit side body 21 and the display unit side body 22 connected via the hinge mechanism 26, thereby causing the operation unit side body 21 and the display unit to be rotated. The side housing 22 can be in an open state (open state), or the operation unit side housing 21 and the display unit side housing 22 can be folded (folded state). In the present embodiment, the foldable mobile phone 1 is described as a portable wireless device. However, the foldable mobile phone 1 is not foldable. A slide type that is slid, a rotary type that rotates one case around an axis along the overlapping direction, a case where both cases 21 and 22 are connected via a biaxial hinge, The display unit 27 and the operation unit 24 to be described later may be arranged in one housing.

  As shown in FIG. 1, the display unit side body 22 is arranged on an inner surface 22 a that is a surface facing the operation unit side body 21 in a folded state, and a display unit 27 that displays various types of information, and a call partner side And an audio output unit 29 for outputting the audio.

  The display unit side body 22 houses a circuit board (not shown) inside the front case 122a and the rear case 122b. A liquid crystal module constituting the display unit 27 is disposed on the surface of the circuit board. The liquid crystal module is accommodated such that the display surface is exposed from the front case 122a. In addition, various electronic components such as a speaker are mounted and electrically connected to the circuit board.

  As shown in FIG. 1, the operation unit side body 21 is in a folded state, the operation unit 24 arranged on the inner surface 21 a that is a surface facing the display unit side body 22, and the user of the mobile phone 1 makes a call. A voice input unit 23 to which a voice uttered from time to time is input, and a battery (not shown in FIG. 1) disposed on the outer surface 21b side, which is the surface opposite to the inner surface 21a. The operation unit 24 includes a function setting operation button 24a for operating various functions such as various settings, a phone book function, and a mail function, and an input operation button 24b for inputting numbers such as telephone numbers and characters such as mail. And a determination operation button 24c for performing determination and scrolling in various operations.

  FIG. 2 is an exploded perspective view of members built in the operation unit side body 21. FIG. 3 is an exploded side view of the operation unit side body 21. 4A is a plan view illustrating the structure of the case body 60 and the flexible wiring board 50, and FIG. 4B is a cross-sectional view illustrating the structure of the case body 60 and the flexible wiring board 50. is there. Here, FIG. 3 is an exploded side view including a state in which the flexible wiring board 50 is stacked on the case body 60 in order to explain the relationship between the case body 60 and the flexible wiring board 50.

  As shown in FIG. 2 or 3, the operation unit side body 21 includes a front case 30, a key sheet 40 that constitutes the various buttons 24 a, 24 b, and 24 c described above, a flexible wiring board 50, and a case body 60. A circuit board 70 including various electronic components including a reference potential pattern and a REF module for a mobile phone, a rear case 80, and a battery 85. In the operation unit side body 21, the front case 30, the key sheet 40, the flexible wiring board 50, the case body 60, the circuit board 70, and the rear case 80 are arranged in a stacked manner. The battery 85 is accommodated in an opening (not shown) formed in the rear case 80 so as to be removable from the outside.

  As shown in FIG. 2 or FIG. 3, the front case 30 and the rear case 80 are arranged such that the concave inner surfaces face each other, and are joined so that the outer peripheral edges overlap each other. Between the front case 30 and the rear case 80, the key sheet 40, the flexible wiring board 50, the case body 60, and the circuit board 70 are incorporated so as to be sandwiched therebetween. That is, the case body 60 is laminated so as to cover the first surface 72 of the circuit board 70, the flexible wiring board 50 is laminated on the upper surface side of the case body 60, and the key sheet 40 is disposed on the upper surface of the flexible wiring board 50. Laminated.

  On the circuit board 70, various electronic components (not shown) are arranged on the first surface 72 on the front case 30 side and the second surface 73 on the opposite side to the first surface 72. A reference potential pattern (not shown) is formed on the first surface 72 of the circuit board 70.

  The case body 60 includes a conductive first case portion 62 and a nonconductive second case portion 64. The first case portion 62 is disposed so as to cover various electronic components (not shown) disposed on the first surface 72 of the circuit board 70 and is electrically connected to the reference potential pattern. The second case portion 64 is continuously disposed at one end of the first case portion 62 and is disposed at the outer edge of the circuit board 70.

  As shown in FIGS. 4 (A) and 4 (B), the first case portion 62 and the second case portion 64 are separate members and are integrated by being engaged with each other. Specifically, a convex engagement portion 44 a formed at one end of the second case portion 64 is engaged with a concave engaged portion 48 a formed at one end of the first case portion 62 so as to be integrated. Fixed in combination. The surface opposite to the circuit board 70 constituted by the first case portion 62 and the second case portion 64 in an engaged state forms a continuous and smooth surface 60a.

  The first case portion 62 is a metal member having a shape in which one wide surface of a thin rectangular parallelepiped is opened. Specifically, as shown in FIG. 3, the first case portion 62 includes a flat plate portion 42 and a rib 44 formed substantially perpendicular to one surface of the flat plate portion 42. The ribs 44 are formed at predetermined positions on the periphery and inside of the flat plate portion 42. Further, the rib 44 is formed to be equal to or sufficiently higher than the height of the electronic component having the highest height among the various electronic components mounted on the first surface 72 of the circuit board 70. Note that the first case portion 62 may be formed by forming a skeleton from a resin and forming a conductor film on the surface thereof, in addition to being formed from a metal.

  The first case portion 62 is electrically connected to the reference potential pattern formed on the first surface 72 of the circuit board 70 by the rib 44. As a result, the first case portion 62 is electrically connected to the reference potential pattern and has the same potential. That is, the first case portion 62 functions as a shield case. Therefore, the first case portion 62 prevents noise from the outside as a shield case from acting on various electronic components (not shown) disposed on the first surface 72 of the circuit board 70, and also prevents RF ( It absorbs noise emitted from a high-frequency circuit such as a radio frequency module and prevents it from acting on other electronic components arranged on the first surface 72.

  The first case part 62 is formed so that one end side is shorter than the circuit board 70 in a state where it is placed on the upper surface of the circuit board 70. And the 2nd case part 64 is arrange | positioned in the part in which the 1st case part 62 in this circuit board 70 is not arrange | positioned.

  As shown in FIGS. 4A and 4B, the second case portion 64 has a curved surface 65a continuous on the upper surface side of the first case portion 62 and a vertical plane formed continuously with the curved surface 65a. It is a resin-like member which has the wall part 65 comprised by 65b. The second case portion 64 is integrally engaged with the first case portion 62, thereby forming one surface 60a in which the flat plate portion 42 and the wall portion 65 are continuous. A flexible wiring board 50, which will be described later, is stacked on the continuous surface.

  The flexible wiring board 50 has a plurality of key switches 524a, 524b, and 524c on the surface on the front case 30 side, and the flat plate portion 42 of the first case portion 62 and the wall portion 65 of the second case portion 64 in the case body 60. Placed on. Since the flexible wiring board 50 is deformable, the flexible wiring board 50 can extend from the first case part 62 and can be placed from the first case part 62 to the second case part 64 in a state of being placed on the case body 60.

  The key switches 524a, 524b, and 524c of the flexible wiring board 50 have a structure having a metal dome of a metal plate that is curved in a bowl shape and is three-dimensionally formed. When the apex of the bowl-shaped shape is pressed, the metal dome contacts a switch terminal formed in an electric circuit (not shown) printed on the surface of the flexible wiring board 50 and is electrically connected.

  An antenna element 66 is disposed in a portion of the flexible wiring board 50 that is stacked on the second case portion 64. Since the second case portion 64 is disposed on one end side of the mobile phone 1, the antenna element 66 is disposed on one end side of the mobile phone 1. Specifically, it is arranged on the end side opposite to the hinge mechanism 26 side.

  The antenna element 66 is a band-shaped metal film, and is disposed along the surface of the flexible wiring substrate 50 opposite to the second case portion 64 side. In other words, the antenna element 66 is disposed along the surface of the flexible wiring board 50 on which the key switches 524a, 524b, and 524c are disposed. Specifically, as shown in FIG. 4A, the antenna element 66 has two points where the band-shaped metal film is located on the first case portion 62 side of the wall portion 65 of the second case portion 64 and is separated from each other. Are arranged so as to have a shape having a convex portion projecting outward on the side away from the first case portion 62 while circulating around the outer edge side of the wall portion 65.

  The flexible wiring board 50 has a wiring sandwiched between a plurality of insulating films, but when the antenna element 66 is formed on the side opposite to the second case part 64 side, Wiring is not provided between the insulating films constituting the flexible wiring substrate 50 in the facing region.

  Further, the antenna element 66 may be formed along the surface of the flexible wiring substrate 50 on the second case portion 64 side, in addition to the surface of the flexible wiring substrate 50 on the side opposite to the second case portion 64 side. In this case, no wiring is provided between the insulating films constituting the flexible wiring board 50 in the region facing the second case portion 64. Furthermore, the antenna element 66 is not formed on the surface of the flexible wiring board 50, but the wiring in the flexible wiring board 50 in a region facing the second case portion 64 can be used as the antenna element 66.

  The portion of the flexible wiring board 50 where the antenna elements 66 are stacked is arranged from the curved surface 65 a to the vertical plane 65 b of the wall portion 65 of the second case portion 64. The curved surface 65 a and the vertical flat surface 65 b in the wall portion 65 of the second case portion 64 are surfaces (surfaces that are not parallel) that intersect with a wide surface in the case body 60 or the circuit board 70, and the antenna element 66 includes the case body 60. The circuit board 70 is arranged in a positional relationship so as to intersect with a wide surface.

  In a state where the flexible wiring board 50 is placed on the case body 60, the antenna element 66 is fed from the circuit board 70 via the feeding terminal 77. The power supply terminal 77 is inserted into a hole (not shown) formed in the vertical plane 65b of the wall portion 65 in the second case portion 64, and one end thereof is opposite to the surface on which the antenna element 66 is disposed on the flexible wiring board 50. Is connected to a contact 55 formed on the back surface of the. The contact 55 is electrically connected to the antenna element 66. The other end of the power supply terminal 77 is connected to a conductive portion 75 that is disposed on the end surface of the circuit board 70 and connected to a power supply portion (not shown). As a result, the antenna element 66 is fed from the circuit board 70 via the feed terminal 77 and is connected to a high-frequency circuit such as an RF module on the circuit board 70.

  The key sheet 40 is configured by attaching a plurality of key tops 424a, 424b, 424c to the surface of a silicon rubber sheet 41 with an adhesive. A plurality of key tops 424a, 424b, 424c in the key sheet 40 are arranged at positions facing the key switches 524a, 524b, 524c in the flexible wiring board 50, and are not shown in the figure and formed in the front case 30 described later. It arrange | positions so that it may expose from a hole.

  The front case 30 is formed with a plurality of key holes on the inner side surface 21a facing the display unit 27 of the display unit side body 22 in a state in which the cellular phone 1 is folded. From each of the plurality of key holes, the pressing surfaces of the key tops 424a, 424b, 424c attached to the key sheet 40 are exposed. By pressing the exposed pressing surfaces of the key tops 424a, 424b, and 424c downward, the tops of the corresponding metal domes (saddle-shaped shapes) in the key switches 524a, 524b, and 524c are pressed, and the switch terminals are pressed. Contact and conduct electrically.

  According to the present embodiment, the antenna element 66 is formed on the flexible wiring board 50, and the flexible wiring board 50 is placed on the case body 60. Specifically, the portion of the flexible wiring board 50 where the antenna element 66 is disposed is stacked on the second case portion 64. Thereby, the mobile phone 1 can be reduced in size and thickness as compared with the conventional structure in which the antenna base is arranged in parallel with the circuit board. For example, the mobile phone 1 can be reduced in size and thickness by arranging other parts in the occupied portion of the conventional antenna base.

  In addition, as shown in FIG. 7, conventionally, the feed terminal 77B is arranged to extend upward (thickness direction) from a part of the antenna base 64B that is arranged on the lower surface of the circuit board 70B. The circuit board 70B is connected to the circuit board 70B. According to the present embodiment, the distance from the lower surface of the antenna base 64B in FIG. 7 to the lower surface of the circuit board 70B can be reduced.

  Further, as in the present embodiment, a power supply terminal 77 is inserted into a hole (not shown) formed in a vertical plane 65b of the wall portion 65 in the second case portion 64, and power is directly supplied from the circuit board 70 to the antenna element 66. By doing so, it is possible to suppress the adverse effect on the antenna characteristics due to external noise and high frequency compared to the case where a predetermined conductive wire is routed.

  Moreover, according to this embodiment, since the 1st case part 62 and the 2nd case part 64 are mutually separate members, they can be formed with the material of the characteristic suitable for each function.

  Further, according to the present embodiment, the first case portion 62 and the second case portion 64 are manufactured by manufacturing processes independent of each other, which is suitable for design changes of the first case portion 62 and the second case portion 64, respectively. It can correspond to.

  Further, according to the present embodiment, the flexible wiring substrate 50 on which the antenna element 66 is formed is attached to the case body 60 in which the second case portion 64 and the first case portion 62 are integrated, thereby integrating the case. Can be incorporated into the housing. Thereby, the load of the assembly work in a housing | casing can be reduced.

  Further, according to the present embodiment, the antenna element 66 is disposed at the end of the operation unit side body 21 and is disposed so as to be in a positional relationship intersecting with a plane including the widest surface of the circuit board 70. Therefore, it is possible to prevent the antenna element 66 from being covered with a hand or the like and to easily receive radio waves that arrive from outside.

  Here, in the above-described embodiment, as shown in FIG. 4B, the antenna element 66 is connected to the conductive portion 75 disposed on the end surface of the circuit board 70 and is formed on the wall portion 65 in the case body 60. The power is supplied from the circuit board 70 through the power supply terminal 77 inserted through the hole (not shown), but the present invention is not limited to this. Hereinafter, another embodiment will be described with reference to FIG. In addition, in other embodiment, since it is the same as that of embodiment mentioned above except the flexible wiring board 50 and electric power feeding structure, description of this similar part is abbreviate | omitted.

  FIG. 8 is a partial cross-sectional view illustrating the structure of the case body 60 and the flexible wiring board 50 in another embodiment. As shown in FIG. 8, in a state where the flexible wiring board 50 is placed on the case body 60, the antenna element 66 is fed from the circuit board 70 via the feeding terminal 700.

  The power supply terminal 700 is provided on a second surface (back surface) 73 opposite to the side on which the case body 60 is disposed in the circuit board 70.

  The contact 500 that is connected to the power supply terminal 700 and supplies power to the antenna element 66 is provided on one end side of the surface of the flexible wiring board 50 on the case body 60 side. This contact 500 is electrically connected to the antenna element 66.

  The flexible wiring board 50 in other embodiments is configured to be longer than the flexible wiring board 50 in the above-described embodiments. The flexible wiring board 50 is arranged from the curved surface 65a to the vertical plane 65b in the second case portion 64, and a portion extending from the case body 60 is fed to the circuit board 70 at the end face of the vertical plane 65b. It arrange | positions so that it may be bent toward the surface in which the terminal 700 is provided. That is, the flexible wiring board 50 extends on the second surface (back surface) 73 of the circuit board 70 so that the portion including the contact 500 in the flexible wiring board 50 is bent at the end of the vertical plane 65b. Thus, the contact 500 and the power supply terminal 700 are arranged to be connected.

  With this configuration, the antenna element 66 is fed from the circuit board 70 via the feed terminal 700 and is connected to a high-frequency circuit such as an RF module on the circuit board 70.

  According to another embodiment, in addition to the effects of the above-described embodiments, the power supply structure is provided by a simple structure in which the power supply terminal 700 is provided on one surface of the circuit board 70 and the contact 500 is provided on one surface of the flexible wiring board 50. Can be configured. Therefore, the burden at the time of manufacture can be reduced and the manufacturing cost can be suppressed.

  As mentioned above, although preferred embodiment and other embodiment of this invention were described, this invention can be implemented with a various form, without being limited to embodiment mentioned above and other embodiment. In the embodiment and the other embodiments, the first case portion 62 and the second case portion 64 are configured as separate members, but may be formed as an integral member. For example, the first case portion 62 and the second case portion 64 may be integrally formed of resin, and the portion constituting the first case portion 62 may be covered with a conductor film. Here, the conductor film can be formed by vapor deposition, plating, or sputtering.

  Thus, when the 1st case part 62 and the 2nd case part 64 are formed as an integral member, while being able to simplify a manufacturing process, the load in the assembly operation | work of the mobile telephone 1 can be reduced.

  Further, in the embodiment and other embodiments, the wall portion 65 in the second case portion 64 has a curved surface shape, but is not limited to this, and as shown in FIG. can do. In this case, the power supply terminal 77A can be arranged to extend upward (in the thickness direction) from the first surface 72A of the circuit board 70A.

  As described above, the second case portion 64 has a shape in which the upper surface is also planar, so that the key switches 524a, 524b, and 524c in the flexible wiring board 50 placed on the case body 60, and key sheets corresponding thereto. The key tops 424 a, 424 b, and 424 c in 40 can be arranged from the first case portion 62 to the second case portion 64. Accordingly, it is possible to arrange the key switches 524a, 524b, 524c and the key tops 424a, 424b, 424c to be wide, and conversely shorten the length of the operation unit side body 21 and carry it. The telephone 1 can also be reduced in size.

  Further, the antenna element 66 can be configured by a part of the printed wiring formed on the flexible wiring board 50. Thereby, an antenna can be easily formed at low cost. Further, the degree of freedom of the size, shape and arrangement position of the antenna element 66 can be increased. Furthermore, since a mold is not required for molding the antenna element 66, the lead time can be shortened.

  Further, as shown in FIG. 6, a coil or the like for removing high frequency can be arranged in the electric circuit of the key switches 524 a, 524 b, and 524 c in the flexible wiring board 50. Thereby, the adverse effect on the high-frequency antenna characteristics due to the key switches 524a, 524b, and 524c in the flexible wiring board 50 being arranged up to the vicinity of the antenna element 66 can be suppressed.

1 is an external perspective view of a mobile phone 1 according to an embodiment of the present invention. 4 is an exploded perspective view of members built in an operation unit side body 21. FIG. 3 is an exploded side view of an operation unit side body 21. FIG. (A) It is a partial top view explaining the structure of the case body 60 and the flexible wiring board 50, (B) It is a fragmentary sectional view explaining the structure of the case body 60 and the flexible wiring board 50. It is a partial side view explaining the structure of the case body 60 and the flexible wiring board 50 in a deformation | transformation form. It is a figure explaining the electric circuit of the switch in a modification. It is a partial side view explaining the conventional electric power feeding structure. It is a fragmentary sectional view explaining the structure of case body 60 and flexible wiring board 50 in other embodiments.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile telephone 21 Operation part side housing | casing 22 Display part side housing | casing 30 Front case 40 Key sheet 50 Flexible wiring board 60 Case body 62 1st case part 64 2nd case part 66 Antenna element 70 Circuit board 72 1st surface 73 Second side (back side)
80 Rear case 85 Battery

Claims (6)

A circuit board having a reference potential pattern and an electronic component;
The first case portion is disposed so as to cover the electronic component, is electrically connected to the reference potential pattern, and is continuously disposed with the first case portion, and is disposed on an outer edge of the circuit board. A case body having a non-conductive second case portion;
A wiring board that is laminated from the first case part to the second case part on the side opposite to the circuit board side in the case body;
A housing for housing the circuit board, the case body, and the wiring board;
A portable wireless device in which an antenna element is disposed in a portion of the wiring board that is stacked on the second case portion.   2. The portable wireless device according to claim 1, further comprising: a plurality of key switches in at least a portion of the wiring board stacked on the first case portion, and a key sheet provided between the housing and the key switch.   The portable wireless device according to claim 2, wherein the plurality of key switches are arranged from the first case part to the second case part.   The portable wireless device according to any one of claims 1 to 3, wherein the first case portion and the second case portion are configured as separate members and are integrally engaged with each other. In the case body, the first case portion and the second case portion are integrally formed of resin,
The portable wireless device according to any one of claims 1 to 3, wherein a portion constituting the first case portion is covered with a conductor film. On the back surface opposite to the surface on which the electronic component is disposed on the circuit board, a feeding point capable of supplying power to the antenna element is disposed,
On one end side of the surface of the wiring board on the case body side, a connecting portion that can be connected to the feeding point and is electrically connected to the antenna element is disposed.
6. The device according to claim 1, wherein a portion including the connection portion in the wiring board is bent so as to be bent, and the connection portion and the feeding point are connected to each other. The portable wireless device described.

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