WO2003081972A1 - Mobile terminal device - Google Patents

Abstract

When a key button (25a) is pressed, a second circuit substrate (24) and a circuit part (30) should be protected from an external stress by a box (28). A mobile terminal device has a first circuit substrate (23) in a case (11) and a second circuit substrate (24) in a case (12) and a shield member (26) is provided between the first circuit substrate (23) and the second circuit substrate (24). The shield member (26) includes a case (27) formed of an elastic member and a box (28) inserted into the space in a case (27). The case and the box are made into a unitary block and fixed to the first circuit substrate (23) and the second circuit substrate (24) with an engagement claws (27d, 27e).

Description

 Specification

Technical field>

 The present invention relates to a portable terminal device such as a portable telephone which can be carried and carried by a person, and more particularly to a portable terminal device having a shield structure of an electronic circuit.

<Background technology>

 In recent years, in mobile terminal devices such as mobile phones, there has been a strong demand for thinner and smaller devices, and the frequency of button operation during use has increased due to multifunctionality. It is necessary to improve the reinforcement structure of the mounted components. Further, there is a situation in which cost reduction is required in designing and manufacturing the device. Further, since a mobile terminal device is generally provided with a high-frequency circuit, the mobile terminal device has a shield structure for shielding electromagnetic waves, and various shield structures have been proposed that also serve as a reinforcing structure for the circuit board and the mounted components.

 8 and 9 show configuration examples of a conventional portable terminal device. FIG. 8 is an exploded perspective view showing a schematic configuration of a conventional portable terminal device, and FIG. 9 is a sectional view of the portable terminal device shown in FIG. The mobile terminal device includes an upper housing 101 and a lower housing 102, and includes a first circuit board 103 and a second circuit board 104 built therein. The first circuit board 103 and the second circuit board 104 are connected and overlapped via connectors 105a and 105b, so that both circuits are electrically connected. I have. The upper housing 101 is provided with key buttons 106 constituting an operation unit, and the first circuit board 103 is provided with a switch 107 which is turned on when the key button 106 is pressed. It is arranged to form a keyboard.

Further, 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 formed by an engagement claw. The first and second circuit boards 103 and 104 are engaged and fixed by being engaged therewith. The shield case 108 has a conductive film on the surface of the resin member, and is provided on the second circuit board 104. It has a function of shielding the mounted circuit components 109 such as high-frequency circuits, and a function of a spacer for holding the first and second circuit boards 103 and 104 at predetermined intervals. I have. A receiving rib 110 is formed in the lower housing 102, and the receiving rib 110 supports the second circuit board 1 • 4 from below.

 In the mobile terminal device having such a configuration, the user pressed down the key button 106 with the finger 111 as shown in FIG. 9B from the state shown in FIG. 9A. At this time, the first circuit board 103 is deformed while receiving the stress caused by the generated stress 113, and the stress is propagated to the shield case 108 below. Since the shield case 108 is made of a molded product made of a resin material, etc., the strength of the top portion 108 a with respect to the vertical force is weak, and it is deformed together with the first circuit board 103 when pressed. I do. At this time, stress is applied to the inner circuit component 109, and distortion is generated in the circuit component 109 and the joints 111 such as solder, thereby causing malfunctions and the like.

 In order to solve the above-mentioned problems, it is necessary to provide a large gap between the fillet portion of the shield case and the circuit component so that the stress can be absorbed. Structure is adopted. However, in such a structure, there is a problem that the thickness of the device is increased if a sufficient gap is provided between members in order to secure a predetermined strength.

 FIG. 10 shows another configuration example of a structure for protecting circuit components on a substrate. The circuit board 1 2 1 has a circuit component 1 2 2 composed of a semiconductor chip, etc. mounted thereon, and a sheet metal case 1 2 3 for covering and protecting the circuit component 1 2 2 is provided thereon. . The sheet metal case 123 is formed in a box shape by bending a metal plate, and is fixed to the conductive pattern formed on the surface 121 a of the circuit board 122 by soldering or the like. The sheet metal case 123 may also serve as a shield member.

 In the structure where the sheet metal case 1 2 3 is fixed on the circuit board 1 2 1 as described above, there is a problem that it is difficult to check and replace the internal circuit components 1 2 2 once assembled. .

However, as described above, the shield structure of the resin member shown in Figs. 8 and 9 with the shield case has sufficient strength to protect the circuit board and circuit components from stress caused by pressing down the key button. To have a configuration with 03 02145 There is a problem that a large gap is required and the thickness of the device becomes large.

 In addition, the circuit component reinforcement structure shown in FIG. 10 in which the sheet metal member case is joined to the circuit board makes it difficult to check and replace the circuit components covered by the sheet metal case, When mounting parts on the back surface, the sheet metal case may fall off by its own weight, causing some problems in terms of workability and cost during and after manufacturing, etc.

 SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to realize a thin and compact device, can be configured at a low cost with good workability, and has a reliable shield structure and sufficient strength. To provide a portable terminal device that can obtain a component protection structure o

<Disclosure of Invention>

 The present invention provides an operation unit comprising: a first circuit board in a housing; and a second circuit board so as to overlap below the first circuit board, and performing a pressing operation on a housing surface portion above the first circuit board. And a shield member provided between the first circuit board and the second circuit board, the shield member having a shield function and holding these circuit boards at a predetermined interval. The shield member is characterized in that a frame body made of an elastic member having a conductive material on the surface is integrated with a box body made of a sheet metal member inserted and arranged in a space of the frame body. And

 According to the above configuration, 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. Shielding function and sufficient strength even when

 DP protection function can be obtained. In addition, since the shield member can be easily attached to and detached from the circuit board, workability during assembly, checking, and replacement of parts is good, and it can be constructed at low cost.

 Further, the shield member is characterized in that the box body is provided 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. Further, 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. It is characterized by having a fitting hole.

 According to the above configuration, since the frame and the box of the shield member are fitted and integrated, reliable conduction and fixation is 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 engages with the hole of the box, so that both members can be easily fitted together.

 Further, the shield member has an extension portion formed by extending 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 into an L-shaped cross section. A contact portion for contacting the second circuit board is provided in the extension portion of

O o

 With the above configuration, when the shield member is attached to the circuit board, the contact portion corresponding to one side of the end portion of the L-shaped cross section in a state where the box body is sandwiched between the circuit board and the frame body. Contacts the circuit board. At this time, the abutting portion of the box has a sufficient area and is securely brought into contact with the circuit board to conduct electricity.

 Further, the shield member has an extension formed by extending at least one side wall of the box formed in a box shape so as to cover a circuit component on the second circuit board in a U-shaped cross section. The extension portion includes a contact portion that contacts the second circuit board, and a fitting receiving portion that receives and fits the frame body. According to the above configuration, at least one peripheral portion of the frame is housed and fitted in the U-shaped extending portion of the box, so that the frame and the box are easily fitted and mounted on the circuit board. A structure that does not easily come off when it is released is realized.

<Brief description of drawings>

 FIG. 1 is a perspective view showing an external configuration of a portable 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 the 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, and FIG. 5 is a cross-sectional view of the shield member of FIG.

 FIG. 6 is a plan view illustrating another configuration example of the shield member according to the present embodiment. FIG. 7 is a cross-sectional view illustrating the shield structure of the portable terminal device according to the present embodiment. Is an exploded perspective view showing a schematic configuration of a conventional portable terminal device,

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

 FIG. 10 is a perspective view showing another configuration example of a protection structure for circuit components on a substrate. In the drawings, reference numeral 10 denotes a mobile terminal device, 11 denotes a first housing, 12 denotes a second housing, 21 denotes an upper housing, 22 denotes a lower housing, and 23 denotes a second housing. One circuit board, 24 a second circuit board, 25 a key unit, 25 a a key button, 26 a shield member, 27 a frame, 27 b a space, 2 7 c is a projection, 27 d and 27 e are engagement claws, 28 and 29 are boxes, 28 a is a hole, 28 b is a top surface, 30 is a circuit part, 31, 3 2 Is an extended portion, 31a and 32a are contact portions, 31b and 32b are fitting receiving portions, 41 is a switch, 42 is a connecting portion, and 43 is a receiving rib.

<Best mode for carrying out the invention>

 Hereinafter, embodiments of the present invention will be described 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 described.

 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. is there.

As shown in FIG. 1, the mobile terminal device 10 includes a first housing 11 and a second housing 12 that are rotatably connected by a hinge portion 13. Can be freely opened and closed as needed when used for voice or data communications. The first housing 11 is provided with a display section 14 such as a liquid crystal display (LCD) for performing various displays during operation, and a receiver 15 for receiving a call. The second housing 12 has an antenna 16 extending from the hinge 13 end, and the front is opened with the housing open as shown in FIG. Each side for operation) An operation unit 17 having a seed key button and a microphone 18 for transmission are provided. As shown in FIG. 2, the second housing 12 has an upper housing 21 and a lower housing 22 formed of ABS resin or the like, and includes a first circuit board 23 and a second The circuit board 24 is built in. Between the first circuit board 23 and the second circuit board 24, there is provided a shield member 26 for shielding and protecting the circuit components 30 mounted on the second circuit board 24. The shield member 26 is attached and fixed to the first and second circuit boards 23 and 24 by engaging claws. The shield member 26 also has a function of a spacer for holding the first and second circuit boards 23, 24 at a predetermined interval, and the shield member 26 allows the two circuit boards 23, 2 4 are stacked at predetermined intervals to form a unit. Further, between the upper housing 21 and the first circuit board 23, a unit 25 in which a plurality of key buttons constituting the operation unit 17 are integrally arranged is provided. . In the key unit 25, hard button keys made of a resin material or the like are arranged side by side on a soft base sheet made of a silicone rubber or the like.

 Next, the configuration of the shield member 26 according to the present embodiment 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 as viewed from above, and FIG. 5 is a cross-sectional view of the shield member of FIG.

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

By inserting the box 28 into the space 27 b of the frame 27 and fitting the hole 28 a of the box 28 with the projection 27 c of the frame 27, Are integrated to form a shield member 26 having a conductive shield case portion having a shield function. The frame 27 is elastically deformable so that the projection 27 c of the frame 27 easily fits into the hole 28 a of the box 28 when assembled as an integrated shield member 26. I will do it It's swelling. FIG. 4 shows a state in which the frame 27 of the shield member 26 and the box 28 are integrally connected.

 As shown in FIG. 5, the box 28 has an extended portion 31 having an L-shaped cross section at one side edge, and has a sufficient area with the second circuit board 24 when assembling the device. A contact portion 31 a to be held and contacted and a fitting receiving portion 31 b for receiving the lower surface of the frame 27 are provided. Further, a U-shaped extension 32 is formed at the other side edge of the box 28 facing the other side, and the contact portion 3 has a sufficient area and contacts the second circuit board 24. 2a and a fitting receiving portion 32b for accommodating the lower surface of the frame 27 are provided.

 When the box 28 and the frame 27 are fitted together, as shown in FIG. 5 (B), the frame 27 is deformed and pressed into the insertion direction 50 of the arrow to insert. They are easily fitted as shown in (A). In the integrated state, the joint 34 between the U-shaped extension 32 of the box 28 and the frame 27 is formed by the protrusion 27 of the frame 27 c. Is also set to a small value, so that the structure is easy to be fitted and hard to come off.

FIG. 6 is a plan view showing another configuration example of the shield member. The shield member 36 in this example has a configuration in which, in addition to the configuration of the shield member 26 shown in FIGS. 3 to 5, another box 29 is provided and fitted to the frame 27. ing. In this way, by providing a plurality of boxes and inserting them into a plurality of spaces of the azure body and fitting them, it becomes possible to shield and protect the mounted circuit components according to the arrangement configuration of the circuit board. . FIG. 7 is a sectional view showing the shield structure of the mobile terminal device according to the present embodiment. The shield member 26 is sandwiched between the first circuit board 23 and the second circuit board 24 and is engaged with each board by engagement claws 27 d and 27 e to be mounted and fixed, The board unit composed of the two circuit boards is housed in the upper housing 21 and the lower housing 22. On the first circuit board 23, a switch 41 that is turned on when a key button 25a of the unit 25 is pressed is disposed correspondingly. A circuit component 30 having 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 28 of the shield member 26 integrated with the frame 27 is disposed so as to cover the circuit component 30 mounted on the second circuit board 24. In addition, the lower housing 22 that receives the second circuit board 24 has Ribs 43 are formed.

 When the user presses the key button 25a with the finger 40 from the state shown in Fig. 7 (A) as shown in Fig. 7 (B), the stress generated by the stress 45 causes the first circuit board 2 Although it is propagated to 3 and tries to deform, the box 28 of the shield member 26 arranged at the bottom of the key resists the stress caused by the stress 45 to minimize the deformation. The top surface 28b of the box 28 made of sheet metal has a rigidity that can repel the stress 45 during the pressing operation, and the box is designed to prevent distortion of the internal circuit components 30 and the joints 42. A protective structure that supports the entire body 28 is formed.

 In addition, the stress 45 acting downward when the key button 25 a is pressed is transmitted to the second circuit board 24 from the contact portions 31 a and 32 a of the box 28. However, the receiving ribs 43 of the lower housing 22 are provided at the positions of the contact portions 31a and 32a, that is, vertically below the position of the frame 27 of the shield member 26. Therefore, the second circuit board 24 between the contact portion 31a and the contact portion 32a has a structure in which deformation and distortion do not occur, and a further protection structure is realized.

 In the present embodiment, since the box 28 has sufficient strength, it is not necessary to provide many gaps between the box 28 and the first circuit board 23, and the thickness can be reduced. In addition, the shield member 26 composed of the frame 27 and the box 28 is required to be in contact with the ground pattern of the second circuit board 24 at the contact portions 31a and 32a, and to be conducted. A good shielding function. Furthermore, since the shield member 26 is only fixed to the first and second circuit boards 23 and 24 by the engagement claws 27 d and 27 e, the shield member 26 can be easily attached and detached.

According to the configuration of the present embodiment described above, by providing a shield member integrating a frame body made of an elastic member and a box body made of a sheet metal member between two circuit boards in a structure independent of the circuit boards. Even when the device is made thinner and smaller by reducing the gap between the substrates, a reliable shielding function and a sufficient strength component protection function can be obtained. The internal circuit components can be protected with sufficient strength against the external stress such as pressing operation by a box made of a hard sheet metal member. In addition, since the shield member has a structure that can be easily attached to and detached from the circuit board, it has good workability when assembling, checking parts on the circuit board, and replacing parts, and can be configured at low cost. P leak 3/02145. Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. This application is based on Japanese Patent Application No. 2002-83839 filed on March 25, 2002, the contents of which are incorporated herein by reference. <Industrial applicability>

 As described above, according to the present invention, it is possible to obtain a reliable shield structure and a component protection structure with sufficient strength that can be configured with good workability and at low cost while realizing a thin and compact device. it can.

Claims

The scope of the claims 1. A first circuit board is provided in the housing, and a second circuit board is provided under the first circuit board, and an operation unit for performing a pressing operation on the housing surface above the first circuit board is provided. Portable terminal device having  A shield member is provided between the first circuit board and the second circuit board, the shield member having a shield function while holding these circuit boards at a predetermined interval, and the shield member has a conductive material on its surface. A portable terminal device comprising: a frame body made of an elastic member having the following structure; and a box body made of a sheet metal member inserted into and disposed in a space of the frame body. 2. The portable 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. Has a projection on the inner wall of the space of the frame into which the box is inserted, and has a hole that fits with the projection at a position corresponding to the projection on the side wall of the box. 3. The mobile terminal device according to claim 1, wherein the mobile terminal device is configured as follows. 4. The shield member has an extension portion formed by extending a side wall portion of the box body formed in an L-shaped cross section so as to cover a circuit component on the second circuit board. The mobile terminal device according to any one of claims 1 to 3, wherein an abutting portion that abuts on the second circuit board is provided in the extension portion. 5. The shield member has an extension formed by extending at least one side wall of the box body having a U-shaped cross section so as to cover circuit components on the second circuit board. The extension portion has a contact portion that contacts the second circuit board, and a fitting receiving portion that receives the fitting by accommodating the frame body. Item 5. The mobile terminal device according to any one of Items 1 to 4.