JP2008011020A - Radio communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize and thin a radio communication terminal by eliminating restriction on an antenna mounting position, and moreover eliminating a wide exclusive area on a circuit board being monopolized by an antenna and mounting other components in that area. <P>SOLUTION: A radio communication terminal 1 has in its housing a circuit board 6 mounted with electronic components, a shielding case 7 arranged being piled up over the circuit board so as to cover the electronic components, a key board 8 having a key switch supported on the shielding case, and a key sheet 9 having an operation key at a position opposed to the key switch. The key board 8 has an antenna 8b, and in addition a non-conductive portion 7b is provided at a corresponding position of the shielding case 7 to the antenna. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a circuit board on which an electronic component is mounted, a shield case disposed on the circuit board so as to cover the electronic component, a key board having a key switch supported on the shield case, The present invention relates to a wireless communication terminal having a key sheet in which operation keys are arranged at a position facing a key switch, in a housing.

  For example, a mobile phone is known as a wireless communication terminal as described above, and many conventional mobile phones have a structure in which an antenna is attached to the outside of the housing. However, recent mobile phones mainly have a design reason. Increasingly, antennas are built in housings.

Furthermore, when a wireless communication terminal such as a mobile phone is compatible with EV-DO, which is a type of communication method CDMA2000, dual band + GPS (global positioning system), Bluetooth, which is a type of short-range wireless communication method, etc. It is necessary to provide two or more antennas, and in recent years, it is required to incorporate these antennas in a housing for the above-described reason (see, for example, Patent Document 1).
JP 2000-134020 A

  However, when an antenna is built in a wireless communication terminal, the performance of the antenna deteriorates if a conductor serving as a ground exists nearby, and the original performance as a wireless communication terminal is impaired. For this reason, since it is necessary to separate the antenna from the conductor serving as the ground, there are problems in that the mounting position of the antenna is restricted and that miniaturization and thinning of the wireless communication terminal are hindered.

  An object of the present invention is to advantageously solve the above-described problem, and a wireless communication terminal according to the present invention includes a circuit board on which an electronic component is mounted and a circuit board that is overlaid on the circuit board so as to cover the electronic component. A wireless communication terminal comprising: a shield case to be disposed; a key board having a key switch supported on the shield case; and a key sheet having an operation key disposed at a position facing the key switch. The key board has an antenna, and a nonconductive portion is provided at a position corresponding to the antenna of the shield case.

  In the wireless communication terminal according to the present invention, the key board separated from the circuit board by the shield case has an antenna, and the shield case is provided with a nonconductive portion at a position corresponding to the antenna. However, it leaves | separates from the circuit board which has a ground layer while leaving | separating from the shield case which has the conductor used as a ground.

  Therefore, according to the wireless communication terminal of the present invention, the restriction on the mounting position of the antenna can be substantially eliminated, and the wide antenna exclusive part on the circuit board can be eliminated and other parts can be mounted on the part. The terminal can be reduced in size and thickness.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing the internal structure of a character input side casing of a foldable mobile phone as an embodiment of the wireless communication terminal of the present invention, and FIG. 2 is an external view of the mobile phone of the embodiment. FIG. 3 is an exploded view of the character input side case and the internal structure of the mobile phone of the above embodiment, with the display side case and the character input side case opened in a mutually open state. FIG. 4 is a side view showing the connection state between the key board and the circuit board in the character input side case of the mobile phone of the above embodiment. In the figure, reference numeral 1 denotes the mobile phone of the above embodiment. Indicates.

  As shown in FIG. 2, the mobile phone 1 according to this embodiment includes a display-side casing 2 as a first casing and a character input-side casing 3 as a second casing. The front case 2a and the rear case 2b are configured to be fitted and fixed to each other, and are provided with a bearing portion 2c at one end thereof. The character input side housing 3 includes a front case 3a and a rear case 3b. And a hollow shaft member 4 fitted to the bearing portion 2c of the display-side housing 2 at one end thereof, and the display-side housing 2 and characters The input side housing 3 can be opened and closed with respect to each other via a hinge portion serving as a coupling mechanism including the bearing portion 2 c and the shaft member 4.

  The display-side housing 2 incorporates a first circuit board (not shown) inside the front case 2a and the rear case 2b, and the liquid crystal display unit 5 installed on the surface of the first circuit board is exposed from the front case 2a. ing. Various electronic components such as a speaker are mounted and electrically connected to the first circuit board.

  On the other hand, as shown in FIGS. 1 and 3, the character input side housing 3 includes the second circuit board 6 in the front case 3 a and the rear case 3 b, and the back surface of the second circuit board 6. A metal shield case 7 serving as a current-carrying member and an electromagnetic shield member is placed over the top surface (the upper surface in FIGS. 1 and 3), and a plurality of key switches 8a are mounted on the shield case 7 to provide a key board. A key flexible board (key FPC) 8 that constitutes a key sheet 9 is supported, and an operation key 9a arranged at a position facing the key switch 8a of a key sheet 9 arranged so as to overlap the key FPC 8 is a front case 3a. It is expressed from. Various electronic parts such as a microphone are mounted and electrically connected to the second circuit board 6.

  Further, as shown in FIG. 3, the antenna base 10 provided with the antenna pattern of the first antenna printed thereon is detachably provided at the longitudinal end portion of the second circuit board 6 that is separated from the hinge portion. ing. The electronic components on the first circuit board in the display-side housing 2 and the electronic components on the second circuit board 6 in the character input-side housing 3 are inserted through the hollow shaft member 4 of the hinge portion. The control signal wiring is electrically connected.

  In the cellular phone 1 of this embodiment, as shown in FIGS. 1 and 3, the longitudinal end portion of the key FPC 8 adjacent to the hinge portion, which is the left side end portion as viewed from the front case 3a side. Above, an antenna pattern 8b used as a second antenna that constitutes diversity together with the first antenna is provided as a part of the printed wiring of the key FPC 8, which is also provided as a part of the printed wiring of the key FPC 8. The board contact portion 8c connected to the antenna pattern 8b extends on the protrusion 8d as the first connector of the key FPC 8 as the wiring of the first connector.

  On the other hand, in the cellular phone 1 of this embodiment, as shown in FIGS. 1 and 3, a cutout portion 7a is provided in a corresponding portion of the shield case 7 that overlaps the antenna pattern 8b, and the cutout portion 7a has a cutout portion 7a. Is fitted with a telescopic member 7b made of a nonconductive material such as a nonconductive resin.

  Furthermore, in the mobile phone 1 of this embodiment, the second connector is formed as a second connector on the left side end portion of the second circuit board 6 adjacent to the hinge portion as viewed from the front case 3a side. The antenna connection tab 11 made of an elastic metal fitting is mounted, the tab 11 is connected to a feeding point (not shown) of the second circuit board 6, and is an intermediate portion in the longitudinal direction of the second circuit board 6. A ground connection tab 12 made of an elastic metal fitting is also mounted on the left side end portion as viewed from the front case 3a side, and the tab 12 is connected to a ground layer (not shown) of the second circuit board 6. . Further, a ground layer (not shown) of the second circuit board 6 is formed so as to avoid a corresponding position overlapping the antenna pattern 8b.

  When the second circuit board 6, the shield case 7, and the key FPC 8 are housed in the character input side housing 3, as shown in FIG. 4, the protruding portion 8d of the key FPC 8 has a telescopic member. The board contact portion 8c on the projecting portion 8d is in electrical contact with the tab 11 so as to face the antenna connecting tab 11 on the second circuit board 6 by being folded down on the lower side of the second circuit board 6, thereby the antenna. The pattern 8 b is electrically connected to the feeding point of the second circuit board 6. The tab 12 for ground connection on the second circuit board 6 is also in electrical contact with the intermediate portion of the shield case 7, whereby the shield case 7 is electrically connected to the ground layer of the second circuit board 6. The

  In the mobile phone 1 of this embodiment, the key FPC 8 separated from the circuit board 6 by the shield case 7 has the antenna pattern 8b, and the shield case 7 is non-conductive at a position corresponding to the antenna pattern 8b. Since the conductive insert member 7b is provided, the antenna pattern 8b is separated from the shield case 7 having the conductor serving as the ground, and from the circuit board 6 having the ground layer. Therefore, according to the mobile phone 1 of this embodiment, the restriction of the mounting position of the antenna pattern 8b can be substantially eliminated, and a wide antenna exclusive part on the second circuit board 6 is eliminated, and other parts are mounted on the part. Therefore, the mobile phone 1 can be reduced in size and thickness.

  Moreover, according to the mobile phone 1 of this embodiment, the ground layer of the circuit board 6 is formed so as to avoid the position corresponding to the antenna pattern 8b. It can be used in a lower and higher performance state.

  Furthermore, according to the mobile phone 1 of the embodiment of this embodiment, the key FPC 8 has a flexible substrate and a key switch provided on the flexible substrate, and the antenna pattern 8b is a print provided on the flexible substrate. Since the antenna is formed by a part of the wiring, the antenna can be formed at low cost, and the antenna pattern 8b can be made flexible, so that the degree of freedom of arrangement of the antenna pattern 8b can be further increased.

  Furthermore, according to the mobile phone 1 of the embodiment of this embodiment, the flexible board constituting the key FPC 8 is connected to the tab 11 as the second connector provided on the circuit board 6 and the protruding portion as the first connector. The antenna pattern 8b is connected to the substrate contact portion 8c on the protruding portion 8d, and the substrate contact portion 8c and the tab 11 are connected, whereby the antenna pattern 8b is connected to the feeding point of the circuit board 6. Since it is electrically connected, the antenna pattern 8 b can be easily connected to the power feeding point of the circuit board 6 when the cellular phone 1 is assembled.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. For example, the present invention is not limited to a mobile phone. For example, the present invention can also be applied to a wireless communication terminal such as a palmtop computer with a wireless communication function or a game machine with a wireless communication function.

  In the above-described embodiment, the non-conductive nested member 7b is provided at a position corresponding to the antenna pattern 8b of the metal shield case 7, but the shield case 7 is formed of a non-conductive resin or the like. In addition, a conductive film may be provided on the surface of the shield case 7 by vapor deposition or the like except for the position corresponding to the antenna pattern 8b.

  Further, in the above-described embodiment, the protruding portion 8d is used as the first connector as it is and the tab 11 is used as the second connector. However, the protruding portion 8d may be inserted into a socket as the second connector. The protrusion 8d and the circuit board 6 may be provided with male and female connectors as the first and second connectors, and they may be connected to each other.

  Furthermore, in the above-described embodiment, the antenna pattern 8b is provided on the side end of the key FPC 8 in the longitudinal direction adjacent to the hinge and on the left side as viewed from the front case 3a. The antenna pattern 8b may be arranged at a longitudinal end adjacent to the hinge portion, in addition to the position on the left side end portion when viewed from the front case 3a side. Further, it may be arranged at another position.

  Thus, according to the wireless communication terminal of the present invention, the restriction on the mounting position of the antenna can be substantially eliminated, and the wide antenna exclusive part on the circuit board can be eliminated and another part can be mounted on the part. The terminal can be reduced in size and thickness.

It is a disassembled perspective view which shows the internal structure of the character input side housing | casing of the foldable mobile telephone as one Example of the radio | wireless communication terminal of this invention. It is a perspective view which shows the external appearance of the mobile phone of the said Example in the state which opened the display side housing | casing and the character input side housing | casing mutually. It is a side view which decomposes | disassembles and shows the character input side housing | casing of the mobile telephone of the said Example, and its internal structure. It is a side view which shows the connection state of the key board | substrate in the character input side housing | casing of the mobile telephone of the said Example, and a circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Display side housing | casing 2a, 3a Front case 2b, 3b Rear case 2c Bearing part 3 Character input side housing | casing 4 Shaft member 5 Liquid crystal display unit 6 2nd circuit board 7 Shield case 7a Notch 7b Nesting member 8 Key Flexible Board (Key FPC)
8a Key switch 8b Antenna pattern 8c Substrate contact portion 8d Protruding portion 9 Key sheet 9a Operation key 10 Antenna base 11, 12 Tab 13 Chip antenna

Claims (4)

A circuit board on which electronic components are mounted;
A shield case disposed on the circuit board so as to cover the electronic component;
A key board having a key switch supported on the shield case;
A key sheet in which operation keys are arranged at positions facing the key switches;
In a wireless communication terminal having a housing
The key board has an antenna,
A wireless communication terminal, wherein a nonconductive portion is provided at a position corresponding to the antenna of the shield case.   The wireless communication terminal according to claim 1, wherein the ground layer of the circuit board is formed so as to avoid a position corresponding to the antenna. The key board has a flexible board and the key switch provided on the flexible board,
The wireless communication terminal according to claim 1, wherein the antenna is configured by a part of a printed wiring provided on the flexible substrate. The flexible board has a first connector connected to a second connector provided on the circuit board,
The antenna is connected to the wiring of the first connector;
The antenna according to any one of claims 1 to 3, wherein the antenna is electrically connected to a feeding point of the circuit board by connecting the first connector and the second connector. The wireless communication terminal described.

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