JP5456231B2 - Portable radio - Google Patents

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 key board, and a key sheet are sequentially stacked in a casing and the antenna is disposed in an end of the casing. Examples can be given (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 according to the present invention includes a circuit board having a reference potential pattern and an electronic component on a first surface, a conductive first case that is disposed so as to cover the electronic component and is electrically connected to the reference potential pattern. And a case body having a non-conductive second case section disposed on an outer edge of the circuit board, and the circuit board and the case body are accommodated. The second case portion includes a wall portion on which the antenna element is disposed, and the virtual plane including the wall portion intersects a virtual plane parallel to the circuit board. Is arranged.

  In addition, it is preferable that 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, 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.

  Further, it is preferable that a key board having a key switch is further provided, and the key board is stacked on at least the first case portion of the case body opposite to the circuit board side.

  In addition, a key switch is provided on the second surface side opposite to the first surface of the circuit board, and the case body is disposed so as to cover a part of the first surface. A battery is preferably disposed between a portion of the surface where the case body is not disposed and an outer surface of the housing.

  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 as a key board, A case body 60, a circuit board 70 having various electronic components including a reference potential pattern and an RF module for a mobile phone, a rear case 80, and a battery 85 are provided. 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. The rib 44 is formed so as to be equal to or sufficiently higher than the height of the highest electronic component 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.

  An antenna element 66 is disposed on the surface of the second case portion 64 opposite to the circuit board 70 side. The second case portion 64 functions as an antenna base. 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 outer surface of the second case portion 64 as an antenna base. 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. Further, the antenna element 66 is disposed so as not to contact the first case part 62 even when the second case part 64 is engaged with the first case part 62. Thereby, the antenna element 66 is electrically insulated from the first case portion 62.

  The antenna element 66 is arranged from the curved surface 65 a to the vertical plane 65 b in 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. That is, the wall portion 65 (the curved surface 65 a and the flat surface 65 b) on which the antenna element 66 is formed is arranged so that the virtual plane including the wall portion 65 intersects the virtual plane parallel to the circuit board 70. In the present invention, the virtual plane including the wall portion 65 on which the antenna element 66 is disposed is a virtual plane including an arbitrarily specified position region among the surfaces of the wall portion 65 on which the antenna element 66 is formed. That means.

  In a state where the case body 60 is placed on the circuit board 70, the antenna element 66 is supplied with power from the circuit board 70 via the power supply terminal 77 as shown in FIGS. 4A and 4B. The power supply terminal 77 is inserted into a hole (not shown) formed in the vertical plane 65 b of the wall portion 65 in the second case portion 64, and one end is connected to the antenna element 66 disposed on the outer surface of the second case portion 64. Is done. 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 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. When the flexible wiring board 50 is placed on the case body 60, the flexible wiring board 50 extends from the first case portion 62 and does not cover the antenna element 66. I do not care.

  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.

  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.

  In the front case 30, a plurality of key holes (not shown) are formed on the inner side surface 21 a 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 apexes 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 second case portion 64 as the antenna base on which the antenna element 66 is disposed is integrated with the first case portion 62 as the shield case and laminated on the circuit board 70. Compared to a structure in which such an antenna base is arranged in parallel with the circuit board, the mobile phone 1 can be reduced in size and thickness. 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.

  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.

  In addition, according to the present embodiment, the flexible wiring board 50 is attached to the case body 60 in which the second case portion 64 and the first case portion 62 in which the antenna element 66 is formed 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 the circuit board 70. In addition, it is possible to prevent the radio waves from being received from the outside from being covered.

  Here, in the above-described embodiment, as shown in FIG. 3, on the upper surface (inside side) of the rear case 80, a circuit board 70 having substantially the same size, and a case body 60, in order from the rear case 80 side. The mobile phone 1 is configured by laminating the flexible wiring board 50 and the key sheet 40, 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 shapes, arrangement | positioning, etc. of the case body 60 and the circuit board 70, description of this similar part is abbreviate | omitted.

  FIG. 6 is an exploded side view of the operation unit side body 21 in another embodiment. As shown in FIG. 6, the operation unit side body 21 includes a front case 30, a key sheet 40, a flexible wiring board 50 as a key board, a circuit board 70 having a reference potential pattern and electronic components, and a case body. 60, 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 circuit board 70, the case body 60, and the rear case 80 are stacked in this order. Here, the circuit board 70 is arranged such that a first surface 72 on which a reference potential pattern (not shown) and electronic components are arranged faces the rear case 80 side. In other words, the circuit board 70 is arranged so that the front and back of the embodiment described above are reversed.

  Various electrical components (not shown) are collectively arranged on one end side of the first surface 72. Then, the case body 60 is laminated on the circuit board 70 so as to cover various electronic components that are collectively arranged on one end side of the first surface 72. Here, since the first surface 72 of the circuit board 70 is arranged facing the rear case 80 side, the case body 60 is arranged on the rear case 80 side of the circuit board 70. That is, the case body 60 is disposed on the side opposite to the above-described embodiment with respect to the circuit board 70. The order of arrangement in the circuit board 70 and the case body 60 is reversed from the embodiment described above.

  Since the case body 60 has only to be large enough to cover a region where various electronic components are gathered and arranged on the circuit board 70, the case body 60 is the case body 60 (see FIG. 3) in the above-described embodiment. About half the size. And the case body 60 arrange | positioned so that the various electronic components not shown arrange | positioned collectively on the one end side of the 1st surface 72 may be covered and biased to the one end side by the side of the rear case 80 in the circuit board 70. Is done.

  The battery 85 is accommodated in an opening (not shown) formed in the rear case 80 so as to be removable from the outside. The battery 85 is arranged so as to be biased toward the other end side in the rear case 80. Specifically, the battery 85 is disposed between the portion of the first surface 72 of the circuit board 70 where the case body 60 is not disposed and the outer surface of the rear case 80. That is, when the circuit board 70 to which the case body 60 is attached is housed in the rear case 80, the case body 60 and the battery 85 are arranged in parallel without overlapping each other.

  The flexible wiring board 50 is stacked on the second surface 73 of the circuit board 70, and the key sheet 40 is stacked on the upper surface of the flexible wiring board 50.

  Moreover, the case body 60 is arrange | positioned at the one end side opposite to the edge part arrange | positioned in 2nd case part 64 which comprises the case body 60 in embodiment mentioned above. That is, the antenna element 66 disposed in the second case portion 64 is disposed on one end side opposite to the end portion disposed in the above-described embodiment.

  Furthermore, since the case body 60 is disposed close to the inner surface of the rear case 80, the antenna element 66 is disposed close to the inner surface of the rear case 80. In other words, the antenna element 66 is arranged on one end side of the rear case 80 in a state where there is nothing to block other than the rear case 80.

  According to another embodiment, in addition to the effects in the above-described embodiment, the arrangement of the electronic components on the circuit board 70 and the arrangement of the case body 60 are devised to effectively use the space in the operation unit side body 21. By disposing each member, the mobile phone 1 can be further reduced in size and thickness. 6 shows an example in which the flexible wiring board 50 having a key switch is stacked on the second surface 73 of the circuit board 70, the key switch is directly formed on the second surface 73 of the circuit board 70. In this case, the thickness of the operation unit side body 21 can be further reduced.

  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 other embodiments, the first case portion 62 and the second case portion 64 are configured by 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.

  In the embodiment and other embodiments, the antenna element 66 is formed on the surface of the wall portion 65 of the second case portion 64 opposite to the circuit board 70 side. You may form in the surface by the side of the circuit board 70 among the wall parts 65. FIG. In the embodiment and other embodiments, the strip-shaped thin film constituting the antenna element 66 can be formed by, for example, vapor deposition, plating, or sputtering. Here, as described above, when the first case portion 62 and the second case portion 64 are integrally formed of resin and the first case portion 62 is covered with the conductive film, the antenna element 66 includes the first case portion 62. The conductor film can be formed simultaneously. The antenna element 66 may be formed of sheet metal. In this case, the second case part 64 may be integrated by partially molding the sheet metal antenna element 66 with resin.

  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. Thereby, the intervals between the key switches 524a, 524b and 524c and the intervals between the key tops 424a, 424b and 424c can be widened.

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 side view explaining the structure of the case body 60 and the flexible wiring board 50 in a deformation | transformation form. It is a decomposition | disassembly side view of the operation part side housing | casing 21 in other embodiment. It is a partial side view explaining the conventional electric power feeding structure.

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 surface 80 Rear case 85 Battery

Claims (4)

A circuit board having a reference potential pattern and an electronic component on a first surface;
A first case part that is electrically conductive with the reference potential pattern, and is disposed continuously with the first case part, and is disposed on an outer edge of the circuit board. A case body having a non-conductive second case portion;
A housing for housing the circuit board and the case body,
At least a part of the second case portion is located outside the plane of the circuit board,
It said second case portion has a wall portion that the antenna element is disposed, said wall portion is arranged to intersect the imaginary plane containing the main surface of the pre-Symbol circuit board,
A key switch is provided on the second surface side opposite to the first surface of the circuit board,
The case body is arranged to cover a part of the first surface,
A portable wireless device in which a battery is disposed between a portion of the first surface where the case body is not disposed and an outer surface of the housing.   The portable wireless device according to claim 1, wherein 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, the first case portion and the second case portion are integrally formed of resin,
The portable wireless device according to claim 1, wherein a portion constituting the first case portion is covered with a conductor film. A key board having a key switch;
4. The portable wireless device according to claim 1, wherein the key board is stacked on at least the first case portion of the case body on the side opposite to the circuit board side. 5.

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