JP2002344172A - Wireless terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless terminal capable of miniaturizing the shape of an extended part and achieving low cost without deteriorating electric characteristics of the wireless terminal. SOLUTION: The wireless terminal comprises a circuit board 4 on which an antenna 5 is mounted, a frame 1 holding the circuit board 4, and an upper and a lower sheet metal covers 2, 3 fitted into the frame 1. The wireless terminal is constructed by inserting at least part of the end of the upper sheet metal cover 2, on the side on which the antenna 5 is mounted, into the frame 1 so that the outer side surface thereof abuts the one surface of the frame 1, and by bending at least apart of the end of the upper sheet metal cover 2 toward the circuit board 4 at the position it does not include antenna 5 to electrically connect it to the circuit board 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a wireless terminal device having a configuration in which an antenna unit and a circuit unit are close to each other, such as a wireless PC card for N.

[0002]

2. Description of the Related Art In recent years, networking has progressed in offices and homes, and a plurality of personal computers, printers, and the like are connected by Ethernet (registered trademark) or the like to form a LAN. On the other hand, attention has been paid to wireless networks because of the trouble of wiring when changing the layout and the difficulty of new wiring.
With the standardization of the transmission speed of 11 Mbps, which is equivalent to that of a wire, by EEE802.11, the introduction of wireless LAN has been progressing at lower cost than before.

[0003] The adapter for wireless LAN is provided as a wireless PC card, but since it requires an antenna section, it has a shape obtained by adding an extension to a normal wireless PC card type II. The size including the extension is specified by the PC card standard, and the maximum width is 54 mm and length is 40 m.
m and a height of 10.5 mm. Each manufacturer,
We are studying how to reduce the size of the radio unit including the antenna unit while maintaining the propagation characteristics.

FIG. 5A is a perspective view of a wireless PC card which is a conventional wireless terminal device, and FIG. 5B is a cross-sectional view taken along a line XX shown in FIG.

In the conventional wireless PC card, a circuit section 46 is mounted on a surface of a main portion of a circuit board 44 as shown in FIG.
The antenna part 45 is mounted on the end surface, the electromagnetic shield member 48 is disposed on the circuit part 46, the circuit board 44 is held by the frame 41, and the circuit board 44 on which the circuit part 46 is mounted
Are covered with an upper sheet metal cover 42, and the lower part of the circuit board 44 is covered with a lower sheet metal cover 43. 41a in the figure is an extension of the frame 41 including the antenna unit 45,
Reference numeral 47 denotes an adhesive portion between the frame 41 and the upper sheet metal cover 42.

In the wireless PC card having such a configuration, in order to reduce the size of the extension portion 41a of the frame 41 including the antenna portion 45, the antenna portion 45 and the circuit portion 46 are necessarily arranged close to each other. Will be.

On the other hand, the wireless PC card standard defines a bending test in which one end of the wireless PC card is held and a load of 2 kgf is applied to the other end as an evaluation of mechanical strength. Therefore, as shown in FIG.
In the portion 47 that comes into contact with the second frame 41, the upper sheet metal cover 42 needs to be bonded so as not to float. Usually, they are bonded with a heat welding tape or the like to secure the bonding strength.

[0008]

However, if the antenna section 45 and the circuit section 46 are arranged close to each other, the radio wave radiated from the antenna section 45 easily goes around to the circuit section 46, resulting in an oscillation phenomenon. And the quality of the transmission signal deteriorates.
Therefore, the electromagnetic shield member 48 is separately provided to prevent the influence of the radiated radio wave, but there is a problem that the cost is increased.

Further, since a step of bonding with a heat welding tape or the like is required, there is a problem that the number of steps is increased and the cost is increased due to the introduction of the bonding equipment.

[0010] The present invention solves the above-mentioned problems, and can arrange the antenna section and the circuit section close to each other without causing any problem in characteristics, can reduce the size of the antenna section, does not require an electromagnetic shield member, and can perform heat welding. It is an object of the present invention to provide a low-cost wireless terminal device that does not need to be bonded with a tape or the like.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a structure in which a circuit board on which electronic parts and an antenna unit are mounted is held by a frame, and upper and lower sheet metal covers are fitted to the frame. A wireless terminal device, wherein at least a part of an end of a sheet metal cover on a side on which the antenna unit is mounted is bent toward the circuit board at a position not including the antenna unit, and is electrically connected to the circuit board. The wireless terminal device is configured to connect to the wireless terminal device.

According to the present invention, since the radio wave radiated from the antenna section can be electromagnetically shielded by the sheet metal cover, the antenna section and the circuit section are arranged close to each other without the need for an electromagnetic shield member. Therefore, the extension of the wireless terminal device can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a circuit board on which electronic components and an antenna section are mounted, a frame for holding the circuit board, and upper and lower sheet metal covers fitted to the frame. In the wireless terminal device, at least a part of the end of the sheet metal cover on the side where the antenna unit is mounted is bent toward the circuit board at a position not including the antenna unit, and is electrically connected to the circuit board. A wireless terminal device that can electromagnetically shield radio waves radiated from an antenna unit with a sheet metal cover, so that an antenna unit and a circuit unit can be arranged close to each other without the need for an electromagnetic shield member. This has the effect that the extension of the device can be made smaller.

According to a second aspect of the present invention, in the wireless terminal device according to the first aspect, the sheet metal cover on which the antenna section is mounted is attached to the frame such that the outer surface thereof is in contact with the frame. Since the antenna unit and the circuit unit can be arranged close to each other because the radio wave radiated from the antenna unit can be electromagnetically shielded by the sheet metal cover, the antenna of the wireless terminal device can be disposed. Since the portion can be made smaller, and since the sheet metal cover is fixed by the frame, there is no need for a bonding step, and the cost can be reduced.

According to a third aspect of the present invention, in the wireless terminal device according to the first or second aspect, a part of an end portion of the sheet metal cover on which the antenna portion is mounted is bent toward the circuit board. Is fixed through the fixing holes provided on the circuit board, and the electrical connection with the circuit board is made firmly, so that the electromagnetic shielding effect increases and the sheet metal cover is fixed to the frame, especially This has the effect of eliminating the need for a bonding step and reducing costs.

According to a fourth aspect of the present invention, in the wireless terminal device according to the first or second aspect, a part of an end portion of the sheet metal cover on which the antenna portion is mounted is bent toward the circuit board. Is fixed to the frame together with the circuit board.In the step of fixing the circuit board to the frame, the electrical connection of the sheet metal cover can be simultaneously taken, and the sheet metal cover is fixed to the frame. ,
This has the effect of eliminating the need for a bonding step and reducing costs.

According to a fifth aspect of the present invention, in the wireless terminal device according to the fourth aspect, a portion of the sheet metal cover on which the antenna portion is mounted is bent toward the circuit board.
The circuit board and the other sheet metal cover are fixed to the frame together with the circuit board.In the process of fixing the upper and lower sheet metal covers to the frame, the upper and lower sheet metal covers can be electrically connected to the circuit board. This eliminates the need for a member for making electrical connection to the sheet metal, and has the effect of further reducing cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1A is a perspective view of a wireless PC card which is a wireless terminal device according to Embodiment 1 of the present invention, and FIG. FIG. 1C is a perspective view of the upper sheet metal cover of the wireless PC card viewed from the antenna side, and FIG. 2 is a perspective view of the upper sheet metal cover of the wireless PC card viewed from the antenna side. is there.

A wireless PC card, which is a wireless terminal device according to the first embodiment of the present invention, has an ABS or PPS as shown in FIG.
And a circuit board 4 which is held by the frame 1 and has a circuit portion 6 mounted on an upper surface of a main portion and an antenna portion 5 mounted on an upper surface of an end portion.
And an upper sheet metal cover 2 and a lower sheet metal cover 3 having conductivity such as stainless steel and fitted to the frame 1. Then, the frame 1 is extended by the antenna section 5 by the extension section 1a.
The upper sheet metal cover 2 on the side on which the antenna section is mounted is fitted to the frame such that the outer side surface is in contact with the frame, and a bent section 7 is formed at the end on the extension section 1a side. The bent portion 7 is bent toward the circuit board 4 at a position not including the antenna portion 5, and is inserted under the extended portion 1 a of the frame 1 to be electrically connected to the circuit board 4. ing.

The ground surface is exposed at the portion of the circuit board 4 which comes into contact with the upper sheet metal cover 2, and the contact portion between the bent portion 7 of the upper sheet metal cover 2 and the circuit board 4 is provided in order to enhance electrical connectivity. Is provided with a conductive member 8 made of conductive rubber or the like.

With the above configuration, the wireless P
With the C card, there is no need to provide a separate electromagnetic shielding member.
By causing the electric wave radiated from the antenna unit 5 and affecting the circuit unit 6 to flow into the ground of the circuit board 4 by the bending unit 7, an electromagnetic shielding effect can be obtained. Accordingly, since the circuit section 6 is not directly affected, the antenna section 5 and the circuit section 6 can be arranged close to each other. Further, the upper sheet metal cover 2 is fixed by the frame 1 and the circuit board 4. Even if the upper sheet metal cover 2 and the frame 1 are not bonded, the upper sheet metal cover 2 does not come off by the bending test. The cost of the wireless PC card can be reduced.

As shown in FIG. 2, the distal end 9 of the bent portion 7 of the upper sheet metal cover 2 is configured to have a spring property so that electrical connection is ensured by the pressing force of the upper sheet metal cover 2. You can also take

As described above, according to the present invention, since the antenna section 5 and the circuit section 6 can be arranged close to each other, the radio terminal apparatus capable of reducing the extension 1a of the frame 1 including the antenna section 5 can be reduced. Can be provided. Further, since a special bonding step is not required to fix the upper sheet metal cover 2, there is an effect that the cost of the wireless terminal device can be reduced.

In the first embodiment, the antenna unit 5
For example, two inverted F-type antennas are used, or one dielectric antenna and one patch antenna are used, and the shape of the antenna element and the type and number of the antenna elements are not limited.

The wireless terminal device is not limited to a wireless PC card.

(Embodiment 2) FIG. 3A is a sectional view of a wireless PC card which is a wireless terminal device according to Embodiment 2 of the present invention, and FIG. 3B shows an upper sheet metal cover of the wireless PC card. It is the perspective view seen from the antenna side.

In FIG. 3, reference numeral 11 denotes an extension of a plastic frame such as ABS or PPS, 12 denotes an upper sheet metal cover having a conductive property such as stainless steel, 13 denotes a lower sheet metal cover having a conductive property such as stainless steel, and 14 denotes a circuit. substrate,
Reference numeral 15 denotes an antenna unit, 16 denotes a part of a circuit unit, 17 denotes a bent portion of the upper sheet metal cover 12, and 18 denotes a fixing protrusion provided on the bent portion 17.

In the second embodiment, the projection 18 is formed on the bent portion 17 of the upper sheet metal cover 12 on the side where the antenna portion is mounted.
And the projection 18 is fixed to the ground portion of the circuit board 14 by solder through a fixing hole provided in the circuit board 14.

With this configuration, the upper sheet metal cover 1
2 can be firmly connected to the circuit board 14, and the shielding effect can be further enhanced. Further, the upper sheet metal cover 12 is firmly fixed to the circuit board 14, so that the upper sheet metal cover 12 does not come off due to a bending test without special bonding, thereby reducing the cost of the wireless PC card. It has the effect that it can be done.

The method of fixing can be a method using a conductive adhesive, a method of bending a fixing projection, or the like, and is not particularly limited to the second embodiment.

In the second embodiment, for the antenna section 5, for example, two inverted F-type antennas are used,
There is no limitation on the shape of the antenna element or the type and number of antenna elements, such as using one dielectric antenna and one patch antenna.

The wireless terminal device is not limited to a wireless PC card.

(Embodiment 3) FIG. 4 (a) is a sectional view of a wireless PC card which is a wireless terminal device according to Embodiment 3 of the present invention, and FIG. 4 (b) shows an upper sheet metal cover of the wireless PC card. It is the perspective view seen from the antenna side.

In FIG. 4, reference numeral 21 denotes an extended portion of a frame made of plastic such as ABS or PPS; 22, an upper sheet metal cover having a conductive property such as stainless steel; 23, a lower sheet metal cover having a conductive property such as stainless steel; substrate,
25 is an antenna part, 26 is a part of a circuit part, 27 is a bent part of the upper sheet metal cover 22, 28 is a screw hole provided in the bent part 27, 29 is a fixing screw, and 30 is a boss provided in the frame 21. is there.

In the third embodiment, a screw hole 28 is provided in the bent portion 27 of the upper sheet metal cover 22 on which the antenna section 25 is mounted, and the upper sheet metal cover 22, the lower sheet metal cover 23, and the ground portion of the circuit board 24 are provided. And when they are fixed to the boss 30 provided on the frame 21 by the screw 29, they are electrically connected to each other.

Normally, in a wireless PC card, the upper and lower sheet metal covers and the circuit board are electrically connected. Therefore, a spring member having conductivity is provided on the circuit board and connected to the upper and lower sheet metal covers. According to this configuration, in the step of fixing the upper and lower sheet metal covers 22 and 23 to the frame 21, the upper and lower sheet metal covers are provided. The electrical connection between the circuit boards 22 and 23 and the circuit board 24 can be established, and the cost can be reduced.

In the third embodiment, the boss 30 is
Is provided and the method of fixing is described, but the method is not particularly limited to this method.

In the third embodiment, for the antenna section 5, for example, two inverted F-type antennas are used,
There is no limitation on the shape of the antenna element, the type and the number of the antenna elements, such as using one dielectric antenna and one patch antenna.

The wireless terminal device is not limited to a wireless PC card.

[0041]

As is apparent from the above description, the present invention comprises a circuit board on which electronic parts and an antenna section are mounted, a frame holding the circuit board, and upper and lower sheet metal covers fitted to the frame. At least a part of the end of the sheet metal cover on the side where the antenna section is mounted is bent toward the circuit board at a position not including the antenna section, and is electrically connected to the circuit board. Since the wireless terminal device is used, the antenna unit and the circuit unit can be arranged close to each other without the need for a seal member, and the wireless terminal device with a small extension can be provided.

[Brief description of the drawings]

FIG. 1A is a perspective view of a wireless PC card which is a wireless terminal device according to a first embodiment of the present invention. FIG. 1B is a cross-sectional view taken along a line XX in FIG. 1A. Perspective view of the upper sheet metal cover in FIG.

FIG. 2 is a perspective view of an upper sheet metal cover of the wireless PC card as viewed from an antenna side.

FIG. 3A is a cross-sectional view of a wireless PC card which is a wireless terminal device according to a second embodiment of the present invention. FIG. 3B is a perspective view of the upper sheet metal cover of the wireless PC card as viewed from the antenna side.

FIG. 4A is a cross-sectional view of a wireless PC card which is a wireless terminal device according to a third embodiment of the present invention. FIG. 4B is a perspective view of an upper sheet metal cover of the wireless PC card as viewed from an antenna side.

5A is a perspective view of a wireless PC card which is a conventional wireless terminal device, and FIG. 5B is a cross-sectional view of a section XX shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 1a Expansion part 2 Upper sheet metal cover 3 Lower sheet metal cover 4 Circuit board 5 Antenna part 6 Circuit part 7 Bending part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Yamaguchi 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Satoshi Matsumoto 1006 Kadoma Kadoma Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co. Terms (reference) 5B035 AA07 AA11 BA09 BB09 BC00 CA02 CA23 CA31 5E348 AA04 AA05 AA32 CC08 EF38 EF41 5J047 AA00 AA19 FD01 5K033 AA04 DA17 DB04 DB08

Claims (5)

[Claims] 1. A wireless terminal device comprising: a circuit board on which electronic components and an antenna section are mounted; a frame holding the circuit board; and upper and lower sheet metal covers fitted to the frame. A wireless terminal device wherein at least a part of the end of the sheet metal cover on the mounted side is bent toward the circuit board at a position not including the antenna section and is electrically connected to the circuit board. . 2. The wireless terminal device according to claim 1, wherein the sheet metal cover on which the antenna section is mounted is fitted to the frame such that an outer surface thereof is in contact with the frame. 3. The circuit board according to claim 1, wherein a part of an end of the sheet metal cover on which the antenna section is mounted is bent toward a circuit board through a fixing hole provided in the circuit board. Wireless terminal device. 4. A part of the end of the sheet metal cover on which the antenna section is mounted, which is bent toward the circuit board, is fixed to the frame together with the circuit board.
The wireless terminal device according to claim 1. 5. The wireless terminal according to claim 4, wherein a portion of the sheet metal cover on which the antenna section is mounted, bent toward the circuit board, is fixed to a frame together with the circuit board and the other sheet metal cover. apparatus.