JP2003283176A - Portable terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a secure shielding structure and a parts protective structure with enough strength by constructing the structure inexpensively with excellent workability while making a device thinner and miniaturizing the device. <P>SOLUTION: A portable terminal device includes a first circuit board 23 and a second circuit board 24 respectively in casings 11, 12, and a shielding member 26 is provided between the circuit boards 23, 24 for holding the circuit boards at a predetermined distance while having a shielding function. The shielding member 26 is constructed with a member obtained by integrating a frame 27 comprising a resilient member and a box 28 comprising a sheet metal inserted into a space in the frame 27, which member is mounted on and fixed to the first and second circuit boards 23, 24 with the aid of engagement pawls 27d, 27e. When a key button 25a is depressed, the second circuit board 24 and circuit parts 30 are protected in deformation and stress from external stress by the rigid box 28, whereby a shielding function and a protective function are satisfactorily ensured while making the device thinner. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal device such as a mobile phone which a person can carry and carry, and more particularly to a mobile terminal device having a shield structure of an electronic circuit.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for thinner and smaller mobile terminal devices such as mobile phones.
It is necessary to improve the reinforcing structure of the circuit board and the mounting component due to the button press in view of the usage situation in which the button operation frequency at the time of use increases due to the multi-functionalization. In addition, there is an urgent need for cost reduction in the design and manufacturing of the device. Further, since a mobile terminal device is generally provided with a high frequency circuit, it has a shield structure that shields electromagnetic waves, and various proposals have been made for this shield structure that also serves as a reinforcing structure for the circuit board and the mounted components.

FIG. 8 and FIG. 9 show a configuration example of a conventional portable terminal device. FIG. 8 is an exploded perspective view showing a schematic configuration of a conventional mobile terminal device, and FIG. 9 is a sectional view of the mobile terminal device shown in FIG. The mobile terminal device includes an upper housing 101 and a lower housing 102.
And a first circuit board 103 and a second circuit board 1
04 built in. The first circuit board 103 and the second circuit board 104 are connected and overlapped via connectors 105a and 105b, and the circuits of both are electrically connected. The upper housing 101 is provided with key buttons 106 that form an operation unit, and the first circuit board 103 is provided.
Switch 1 that turns on when the key button 106 is pressed
07 are correspondingly arranged to form a keyboard portion.

A shield case 108 made of a resin member is provided between the first circuit board 103 and the second circuit board 104, and the shield case 108 is provided with engaging claws for the first and second circuits. The boards 103 and 104 are engaged and fixed. The shield case 108 has a conductive film on the surface of the resin member, has a function of shielding a circuit component 109 such as a high frequency circuit mounted on the second circuit board 104, and has a first and second circuit board. 10
It has a function of a spacer for holding the 3, 104 at a predetermined interval. Further, a receiving rib 110 is formed on the lower housing 102, and the receiving rib 110 allows the second circuit board 10 to be formed.
4 is supported from below.

A portable terminal device having such a configuration is shown in FIG.
From the state shown in FIG. 9A, the user touches the finger 1 as shown in FIG. 9B.
When the key button 106 is pressed with 11, the first circuit board 103 is deformed while receiving the stress 113 generated, and the stress is propagated to the shield case 108 below. Since the shield case 108 is made of a resin material or the like, the strength of the top portion 108a against the vertical force is weak, and it deforms together with the first circuit board 103 during the pressing operation. At this time, stress is applied to the inner circuit component 109, and the circuit component 109 and the joint portion 111 such as solder are distorted, resulting in malfunction or the like.

In order to solve the above problems, a structure is adopted in which the stress 113 can be absorbed by providing a large gap 112 between the top portion 108a of the shield case 108 and the circuit component 109. But in such a structure,
If a sufficient gap is provided between the members in order to secure a predetermined strength, there is a problem that the thickness of the device becomes large.

FIG. 10 shows another structural example of the structure for protecting the circuit components on the board. A circuit component 122 made of a semiconductor chip or the like is mounted on the circuit board 121, and a sheet metal case 1 for covering and protecting the circuit component 122 thereon.
23 are provided. The sheet metal case 123 is formed by bending a metal plate into a box shape, and is joined and fixed to a conductive pattern formed on the front surface 121 a of the circuit board 121 by soldering or the like. The sheet metal case 123 may also serve as a shield member.

In the structure in which the sheet metal case 123 is fixed on the circuit board 121 as described above, there is a problem that it is difficult to check or replace the internal circuit component 122 after once assembled.

[0009]

As described above, FIG.
In addition, in the shield structure using the shield case of the resin member shown in FIG. 9, in order to have a structure having sufficient strength to protect the circuit board and the circuit components from the stress caused by the pressing operation of the key button, a large space is required between the members. There is a problem that a gap is required and the thickness of the device becomes large.

In addition, in the structure for reinforcing the circuit parts by joining the case of the sheet metal member to the circuit board shown in FIG. 10, it is difficult to check and replace the circuit parts covered by the sheet metal case, and the circuit board There are some problems in workability and cost during or after manufacturing, such as the possibility that the sheet metal case may drop off by its own weight when the component is surface-mounted on the back surface of the.

The present invention has been made in view of the above circumstances, and an object thereof is to realize a thin device and a small size of the device, and at the same time, to construct the device with good workability and at a low cost, with a reliable shield structure and a sufficient shield structure. An object of the present invention is to provide a mobile terminal device capable of obtaining a strong component protection structure.

[0012]

According to the present invention, a housing is provided with a first circuit board and a second circuit board so as to overlap therewith, and the housing above the first circuit board. A mobile terminal device having an operation section for performing a pressing operation on a surface section,
The shield member is provided between the first circuit board and the second circuit board, holds the circuit boards at a predetermined interval and has a shield function, and the shield member has a conductive material on the surface. It is characterized in that a frame body made of an elastic member and a box body made of a sheet metal member inserted and arranged in the space of the frame body are integrated.

With the above-described structure, the shield member, in which the frame body made of the elastic member and the box body made of the sheet metal member are integrated, is provided between the two circuit boards in a structure independent of the circuit board. Even if it is downsized, it is possible to obtain a reliable shield function and a component protection function of sufficient strength. Further, since the shield member is easily attached to and detached from the circuit board, workability at the time of assembling, checking, and component replacement is good, and the shield member can be constructed at low cost.

The shield member is characterized in that the box body is arranged in a plurality of space portions of the frame body.

With the above configuration, the shield structure and the protection structure can be arbitrarily configured according to the arrangement of the circuit components mounted on the circuit board.

The shield member has a protrusion on the inner wall of the space of the frame into which the box is inserted, and the protrusion is provided at a position corresponding to the protrusion on the side wall of the box. It is characterized in that it is configured to have a hole that fits with the section.

With the above structure, since the frame body and the box body of the shield member are fitted and integrated with each other, reliable conduction and fixing are achieved in the shield member composed of a plurality of members. At this time, the frame of the elastic member is elastically deformed and the projection is engaged with the hole of the box, so that both members can be easily fitted together.

Further, the shield member has an extension portion in which a side wall portion of the box body formed in a box shape so as to cover the circuit component on the second circuit board is extended and formed in an L-shaped cross section. However, the extension portion is provided with a contact portion that contacts the second circuit board.

With the above construction, when the shield member is attached to the circuit board, the abutment portion corresponding to one side of the end portion having the L-shaped cross section in a state where the box body is sandwiched between the frame body and the circuit board. Contacts the circuit board. At this time, the abutting portion of the box body has a sufficient area and surely abuts on the circuit board for electrical conduction.

The shield member is formed by extending at least one side wall portion of the box body formed in a box shape so as to cover the circuit components on the second circuit board so as to have a U-shaped cross section. And a fitting receiving portion that is in contact with the second circuit board and a fitting receiving portion that receives the fitting of the frame body.

With the above structure, since the peripheral portion of at least one side of the frame body is accommodated and fitted in the extending portion having a U-shaped cross section of the box body, the frame body and the box body are easily fitted together, and the circuit board is easy to fit. A structure that does not easily come off when mounted on

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a configuration example of a mobile phone having a shield structure as a mobile terminal device will be shown.

FIG. 1 is a perspective view showing an external configuration of a mobile terminal device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a member configuration of a second housing provided with a shield structure in the mobile terminal device. It is a figure.

As shown in FIG. 1, the portable terminal device 10 is
The first housing 11 and the second housing 12 are rotatably connected to each other by a hinge portion 13, and can be freely used as needed when the user uses it in a voice call or data communication. It can be opened and closed. The first housing 11 is provided with a display unit 14 such as a liquid crystal display (LCD) that performs various displays during operation, and a receiver 15 for receiving a voice. The second housing 12 is provided with an antenna 16 extending from the end on the hinge portion 13 side, and
An operation unit 1 including various key buttons for operation on the front side (inner side when closed) with the housing opened as shown in FIG.
7 and a microphone 18 for transmission are provided.

As shown in FIG. 2, the second housing 12 is A
It has an upper casing 21 and a lower casing 22 formed of BS resin or the like, and is configured by incorporating a first circuit board 23 and a second circuit board 24. A shield member 26 that shields and protects the circuit component 30 mounted on the second circuit board 24 is provided between the first circuit board 23 and the second circuit board 24. The shield member 26 is fitted and fixed to the first and second circuit boards 23 and 24 by engaging claws. The shield member 26 includes the first and second circuit boards 2
It also has a function of a spacer for holding the three and the four at predetermined intervals, and the two circuit boards 23,
24 are piled up at a predetermined interval and unitized. Also,
The operation unit 1 is provided between the upper housing 21 and the first circuit board 23.
There is provided a key unit 25 in which a plurality of key buttons forming part 7 are integrally arranged. Key unit 25
The hard button keys made of a resin material or the like are mounted side by side on a soft base sheet made of silicon rubber or the like.

Next, the shield member 2 according to the present embodiment
The configuration of No. 6 will be described in detail. 3 is a perspective view showing the configuration of the shield member, FIG. 4 is a plan view of the shield member seen from above, and FIG. 5 is a sectional view taken along line AA of the shield member of FIG.

As shown in FIG. 3, the shield member 26 is
It has a frame body 27 made of an elastic member formed by molding a resin material such as ABS resin in a frame shape, and a box body 28 made of a rigid sheet metal member formed by bending a metal plate material into a box shape. . In the frame 27, a surface of the elastic member 27a is coated with a conductive film which is a conductive material, and a fitting projection 27c is formed on the inner wall of a space 27b partitioned by the frame.
Further, an engagement claw 27d that engages with the first circuit board 23 and an engagement claw 27e that engages with the second circuit board 24 are formed to extend vertically. The box body 28 has holes 2 for fitting the projections 27c of the frame body 27 on the side wall portion obtained by bending the sheet metal member.
8a is provided.

By inserting the box body 28 into the space 27b of the frame body 27 and fitting the hole 28a of the box body 28 into the projection 27c of the frame body 27, both members are integrated and the shield function is provided. The shield member 26 including the conductive shield case portion is included. The frame body 27 is configured to be elastically deformable, and when the frame body 27 is assembled as an integrated shield member 26, the protrusion 27 c of the frame body 27 has a hole 28 in the box body 28.
It is designed to fit easily into a. FIG. 4 shows a state in which the frame body 27 and the box body 28 of the shield member 26 are integrally connected.

As shown in FIG. 5, the box body 28 has an extending portion 31 having an L-shaped cross section formed on one side edge portion thereof, and has a sufficient area with the second circuit board 24 when assembled in the apparatus. An abutting portion 31a that is held and abutted, and a fitting receiving portion 31b that receives the lower surface portion of the frame 27 are provided. Further, an extending portion 32 having a U-shaped cross section is formed on the other side edge portion of the box body 28 which faces the contact portion 32a, which comes into contact with the second circuit board 24 with a sufficient area, and a frame body. A fitting receiving portion 32b for accommodating the lower surface portion of 27 is provided.

When the box body 28 and the frame body 27 are fitted to each other, as shown in FIG.
As shown in FIG. 5B, the frame 27 is deformed while being pressed and inserted in the insertion direction 50 indicated by the arrow, so that the frame 27 is easily fitted as shown in FIG. 5A. In the integrated state, the U-shaped extension 32 of the box 28 and the frame 27
Since the backlash 34 is configured to have a value smaller than the fitting amount 33 of the protrusion 27c of the frame 27, the structure is easy to fit and is hard to be removed.

FIG. 6 is a plan view showing another structural example of the shield member. The shield member 36 of this example is shown in FIGS.
In addition to the configuration of the shield member 26 shown in FIG. 3, another box body 29 is provided and fitted to the frame body 27. By providing a plurality of boxes and inserting and fitting the boxes in a plurality of spaces in the frame, it is possible to shield and protect the mounted circuit components in accordance with the layout of the circuit board.

FIG. 7 is a sectional view showing the shield structure of the portable terminal device according to the present embodiment. Shield member 26
Are sandwiched between the first circuit board 23 and the second circuit board 24, and are engaged and fixed to the respective boards by the engaging claws 27d and 27e. It is housed in the housing 21 and the lower housing 22.
The first circuit board 23 is provided with a switch 41 that is turned on when the key button 25a of the key unit 25 is pressed. A circuit component 30 including a high-frequency circuit such as a wireless circuit is mounted on the second circuit board 24, and is electrically and mechanically connected by a joint 42 such as solder. The box body 28 of the shield member 26 integrated with the frame body 27 is a circuit component 3 mounted on the second circuit board 24.
It is arranged so as to cover 0. A receiving rib 43 is formed on the lower housing 22 that receives the second circuit board 24.

When the user presses down the key button 25a with the finger 40 as shown in FIG. 7B from the state shown in FIG. 7A, the stress 45 generated is propagated to the first circuit board 23. However, the box body 28 of the shield member 26 disposed below the box body 28 resists the stress caused by the stress 45 and minimizes the deformation. The top surface portion 28b of the box body 28 formed by the sheet metal member has a stress of 45 when the pressing operation is performed.
A protective structure is formed that has a rigidity that can repel each other and that is supported by the entire box body 28 so that the internal circuit component 30 and the joint portion 42 are not distorted.

Further, the stress 45 acting downward when the key button 25a is depressed is due to the contact portions 31a, 3a of the box 28.
It is propagated from 2a to the second circuit board 24. However, since the receiving rib 43 of the lower housing 22 is disposed vertically downward of the positions of the contact portions 31a and 32a, that is, the position of the frame body 27 of the shield member 26, the receiving ribs 43 contact the contact portion 31a. The second circuit board 24 between the contact portions 32a has a structure such that deformation or distortion does not occur, and a further protective structure is realized.

In the present embodiment, since the box body 28 has sufficient strength, it is not necessary to provide many gaps with the first circuit board 23, and it is possible to reduce the thickness. Further, the shield member 26 including the frame 27 and the box 28 surely comes into contact with the ground pattern of the second circuit board 24 at the contact portions 31a and 32a to be electrically connected, and a necessary shield function is obtained. Furthermore, since the shield member 26 is only fixed to the first and second circuit boards 23 and 24 by the engaging claws 27d and 27e, it can be easily attached and detached.

According to the above-described configuration of the present embodiment, the shield member, which integrates the frame body made of the elastic member and the box body made of the sheet metal member, is provided between the two circuit boards in a structure independent of the circuit board. As a result, even when the gap between the substrates is reduced and the device is made thin and compact, a reliable shield function and a component protection function with sufficient strength can be obtained. With respect to external stress such as a pressing operation, the internal circuit component can be protected with sufficient strength by the box body made of a hard metal plate member. Further, since the shield member has a structure that can be easily attached to and detached from the circuit board, workability at the time of assembling, checking components on the circuit board, exchanging components, etc. is good, and the shield member can be constructed at low cost.

[0037]

As described above, according to the present invention, the device can be made thin and compact, and can be constructed at a low cost with good workability, a reliable shield structure and a component protection structure having sufficient strength. Can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external configuration of a mobile terminal device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a member configuration of a second housing provided with a shield structure in the mobile terminal device according to the present embodiment.

FIG. 3 is a perspective view showing a configuration of a shield member according to the present embodiment.

FIG. 4 is a plan view of the shield member according to the present embodiment as viewed from above.

5 is a cross-sectional view taken along the line AA of the shield member of FIG.

FIG. 6 is a plan view showing another configuration example of the shield member according to the present embodiment.

FIG. 7 is a cross-sectional view showing the shield structure of the mobile terminal device according to the present embodiment.

FIG. 8 is an exploded perspective view showing a schematic configuration of a conventional mobile terminal device.

FIG. 9 is a cross-sectional view showing a shield structure of a conventional mobile terminal device.

FIG. 10 is a perspective view showing another configuration example of the circuit component protection structure on the substrate.

[Explanation of symbols]

10 Mobile terminal devices 11 First case 12 Second housing 21 Upper case 22 Lower case 23 First circuit board 24 Second circuit board 25 key unit 25a key button 26 Shield member 27 frame 27b space section 27c protrusion 27d, 27e Engaging claw 28, 29 box 28a hole 28b Top surface part 30 circuit parts 31, 32 Extension part 31a, 32a abutting portion 31b, 32b Fitting receiving part 41 switch 42 joint 43 receiving rib

Claims (5)

[Claims] 1. An operation of providing a first circuit board and a second circuit board so as to overlap therewith in a housing, and performing a pressing operation on a surface portion of the housing above the first circuit board. A mobile terminal device having a portion, which is provided between the first circuit board and the second circuit board, and includes a shield member having a shield function while holding these circuit boards at a predetermined interval, The shield member is configured by integrating a frame body made of an elastic member having a conductive material on a surface thereof and a box body made of a sheet metal member inserted and arranged in a space of the frame body. Mobile terminal device. 2. The mobile terminal device according to claim 1, wherein the shield member is configured by disposing the box body in a plurality of space portions of the frame body. 3. The shield member has a protrusion on an inner wall of a space of the frame into which the box is inserted, and the protrusion is provided at a position corresponding to the protrusion on a side wall of the box. The mobile terminal device according to claim 1 or 2, wherein the mobile terminal device is configured to have a hole that fits with the portion. 4. The shield member has an extension portion in which a side wall portion of the box body formed in a box shape so as to cover a circuit component on the second circuit board is extended and formed in an L-shaped cross section. The mobile terminal device according to any one of claims 1 to 3, wherein a contact portion that contacts the second circuit board is provided in the extension portion. 5. The extension member in which at least one side wall portion of the box body formed in a box shape so as to cover the circuit component on the second circuit board is formed to extend in a U-shaped cross section. A contact portion that contacts the second circuit board, and a fitting receiving portion that accommodates the frame body and is fitted to the second circuit board. Items 1 to 4
The mobile terminal device according to any one of 1.