JP4536103B2 - Mobile terminal device - Google Patents

Description

  The present invention relates to a mobile terminal device such as a mobile phone, a PHS (Personal Handyphone System), and a PDA (Personal Digital Assistant), and more particularly to a mobile terminal device that is made thinner.

  In recent years, mobile terminal devices represented by mobile phones have been developed in various ways, and can be assembled at low cost with good workability while realizing thinning and downsizing of devices, a reliable shield structure and sufficient strength It is required to obtain a component protection structure.

  For example, a portable terminal that includes a first circuit board and a second circuit board in a housing, and a shield member that holds the circuit board at a predetermined interval and has a shielding function is provided between the circuit boards. The device is known. The shield member is formed by integrating a frame body made of an elastic member and a box body made of a sheet metal member inserted and disposed in a space portion of the frame body. Attached and fixed to the circuit board. Note that the frame has a conductive film as a conductive material on the surface of an elastic member formed by molding a resin material such as ABS resin into a frame shape, and is fitted to the inner wall of the space section partitioned by the frame. A combination protrusion is formed. With such a configuration, when the key button is pressed, it is possible to protect the second circuit board and the circuit components from deformation and distortion against the external stress by the rigid box body, while reducing the thickness of the device. A shield function and a protective function can be sufficiently obtained (Patent Document 1).

  There is also known a circuit board shield structure in which a recess is provided in a chassis and a protrusion provided on an end surface of the circuit board is engaged with the recess (Patent Document 2). On the contrary, there is also known a circuit board mounting structure in which a protrusion is provided on the chassis and a recess provided on an end surface of the circuit board is engaged with the protrusion (Patent Document 3).

JP 2003-283176 A Japanese Utility Model Publication No. 54-175211 JP 2001-251070 A

However, in the portable terminal device of Patent Document 1, in order to form a fitting projection on the shield member, a frame body that is a part of the shield member uses a resin material such as ABS resin formed into a frame shape. In order to maintain the strength, a certain thickness is required, which hinders the reduction in thickness.
Therefore, instead of forming a fitting projection on the shield member, the shield structure of the circuit board or the circuit board attachment structure as in Patent Documents 2 and 3 can be adopted to reduce the thickness of the shield member. However, it is preferable to reduce the thickness of the shield member from the viewpoint of reducing the thickness of the mobile terminal device. However, depending on the thickness of the shield member, the circuit board may be damaged at the time of dropping only by the configuration as in Patent Documents 2 and 3. In some cases, there was a problem in terms of strength. Further, even when the configurations as in Patent Documents 2 and 3 are adopted, in order to obtain a reliable shielding effect, it is necessary to ensure ground connection between the shield member and the circuit board.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable terminal device that can be thinned and has high impact resistance.

A portable terminal device according to the present invention includes a case that forms a part of a housing, a cover that forms a part of the housing and includes a first recess and a second recess inside, A metal plate having a first upright portion that is housed and formed with a notch in the periphery, and a second upright portion formed on a side opposite to the first upright portion; It has a first projection on the side which faces corresponding to lack, before Symbol the second projections possess on the sides facing each other corresponding to the first recess, and having the second protrusion and a circuit board having a third projection at a position corresponding to the end portion of the second upright portion with a on the side corresponding to said second recess, the circuit board, the first It is secured to the metal plate by engaging the projections on the notch, so the pre-Symbol second protrusion engaged with the first recess Is secured to the cover by, and said third projection to that engaged with the second recess is fixed to the metal plate by engaged to an end portion of said second upright portion It is fixed to the cover .
According to this configuration, it is possible to reduce the thickness of the mobile terminal device by using the metal plate as the shield member and making the metal plate thin. In addition, it is possible to provide a mobile terminal device with high impact resistance by engaging the circuit board with a cover and a metal plate that constitute a part of the housing and dispersing the impact when dropped. Further, with such a configuration, the mobile terminal device can be assembled with good workability and at low cost.

Further, the present invention provides the portable terminal device described above, further comprising a side key provided on a side surface of the housing, and the cover has the first recess inside the side surface on which the side key is provided. The metal plate is characterized in that the notch is formed in the first upright portion opposite to the side surface on which the side key is provided.
According to this configuration, the mechanical strength of the part to which the side key is attached is maintained, and when the side key is pressed, the force is not easily transmitted to the circuit board, and the entire casing is dropped while being thinned. It is possible to provide a portable terminal device that is highly resistant to impacts such as time.

According to the portable terminal device of the present invention, the thickness of the portable terminal device can be reduced by using a metal plate as the shield member and making the metal plate thin. In addition, it is possible to provide a mobile terminal device with high impact resistance by engaging the circuit board with a cover and a metal plate that constitute a part of the housing and dispersing the impact when dropped. Further, with such a configuration, the mobile terminal device can be assembled with good workability and at low cost.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.
1 (a) and 1 (b) show an overall schematic diagram of a mobile phone 10 as a mobile terminal device according to a first embodiment of the present invention.
As shown in FIG. 1, the mobile phone 10 according to the first embodiment of the present invention includes an upper housing 2 and a lower housing 3, and the upper housing 2 and the lower housing 3 are coupled by a hinge 4. ing. The upper housing 2 can be rotated with respect to the lower housing 3 in the X direction (vertical direction) or the Y direction (horizontal direction) with respect to the lower housing 3 using the hinge 4 or the hinge shaft 41. The upper housing 2 is provided with a liquid crystal display unit 21 and a receiver 22 on a surface (the lower surface in FIG. 1A) facing the lower housing 3 in a state where the housing is folded. The lower housing 3 is provided with a key button and a transmitter on a surface (upper surface, front surface in FIG. 1) facing the upper housing 2 in a state where the housing is folded.

  FIG. 2 is an exploded perspective view (front side) of the lower housing 3 of the mobile phone 10. FIG. 3 is an exploded perspective view of the lower housing 3 of the mobile phone 10 as viewed from the opposite side (back side) to FIG. As shown in FIGS. 2 and 3, the lower housing 3 of the mobile phone 10 includes a case 37 and a cover 31. The lower housing 3 houses a key sheet 32, a metal plate 33, a shield lid 34, a circuit board 35, and the like. The lower housing 3 includes a case 37 and a cover 31, and can be assembled with good workability by storing them. Further, in the mobile phone 10 of the present embodiment, a sub circuit board 36 is further provided in addition to the circuit board 35. Further, a battery pack 39, a battery lid 38, and the like are attached to the back side.

  FIG. 4 shows an enlarged view of the circuit board 35, the shield lid 34, and the metal plate 33. As shown in FIG. 4, the metal plate 33 has upright portions 331a and 331b on the periphery. Notches 332a, 332b, and 332c are formed in the standing portion 331a. The metal plate is formed by punching and bending a metal plate having a thickness of about 0.3 mm. The metal plate 33 shields the circuit board 35 having a high frequency circuit and the like of the lower housing 3.

  The circuit board 35 has protrusions 351 a, 351 b, and 351 c on opposite sides corresponding to the notches 332 a, 332 b, and 332 c of the rising portion 331 a of the metal plate 33. The circuit board 35 is fixed to the metal plate 33 by engaging the protrusions 351a, 351b, and 351c with the notches 332a, 332b, and 332c.

  Further, a shield cover 34 is attached to the main surface of the circuit board 35 as shown in FIGS. The shield lid 34 is interposed between the circuit board 35 and the metal plate 33. The shield lid 34 has a cut and raised piece that elastically contacts the chassis frame. By inserting such a shield lid 34 between the circuit board 35 and the metal plate 33, a ground connection between the metal plate 33 and the circuit board 35, which is a shield member, even when a key button is pressed or an impact is received. By ensuring the above, it is possible to obtain a reliable shielding effect and improve shock-absorbing properties. The shield cover 34 can be formed by punching and bending a metal plate having a thickness of about 0.1 mm.

  FIG. 6 is a diagram illustrating a state in which a shield plate 34 attached to the main surface of the circuit board 35 is housed in the metal plate 33. As shown in FIG. 6, the circuit board 35 is fixed to the metal plate 33 by engaging the protrusions 351a, 351b, and 351c with the notches 332a, 332b, and 332c.

  FIG. 7 shows a state in which the main surface of the circuit board 35 shown in FIG. 6 with the shield lid 34 attached is housed in the metal plate 33 and further stored in the cover 31 together with the key sheet 32. As shown in FIG. 7, the cover 31 has recesses 311a and 311b on the inner side. The circuit board 35 has other protrusions 351d and 351e on the opposite side in addition to the protrusions 351a, 351b, and 351c described above. The other protrusions 351d and 351e of the circuit board 35 are located on opposite sides corresponding to the recesses 311a and 311b of the cover 31. The circuit board 35 is fixed to the cover by engaging the other protrusions 351d and 351e with the recesses 311a and 311b.

  According to such a configuration, it is possible to reduce the thickness of the mobile terminal device 10 by using the metal plate 33 as the shield member and making the metal plate 33 thinner. In addition, it is possible to provide the mobile phone 10 with high impact resistance by locking the circuit board 35 to the cover 31 and the metal plate 33 which constitute a part of the housing, and dispersing the impact when dropped. it can. Further, by adopting such a configuration, the number of screws and the like can be reduced as much as possible, and the mobile phone 10 can be assembled with good workability and at low cost.

Next, FIG. 2, FIG. 6, FIG. Will be described with reference to FIG.
As shown in FIG. 2, the side keys 322 a and 322 b are provided in the extending portion of the key sheet 32. The key sheet 32 is provided with a dome-shaped switch portion 321 on a flexible substrate. The side keys 322a and 322b are attached to the standing portion 331b of the metal plate 33 (see the side key attachment positions 422a and 422b shown in FIGS. 2 and 7). And it is stored in the side key attachment position 522a, 522b (refer FIG. 2) of the cover 31. FIG.

  In order to attach the side keys 322a and 322b, the standing part 331b of the metal plate 33 has a height higher than that of the standing part 331a to which the side key is not attached. Further, the upright portion 331b to which the side keys 322a and 322b are attached needs to have such strength because the side keys 322a and 322b may be pressed. For this reason, it is not desirable for the standing portion 331b to which the side keys 322a and 322b are attached to have notches having the same shape as the notches 332a, 332b, and 332c of the standing portion 331a from the viewpoint of securing strength. Also, if a notch is provided in this part, the force is easily transmitted to the circuit board 35 when the side keys 322a and 322b are pressed. From the viewpoint of securing the strength of the circuit board 35, Not very effective.

  Therefore, the projections 351a, 351b, 351c and the other projections 351d, 351e are not provided on the portion of the circuit board 35 corresponding to the portion to which the side keys 322a, 322b are attached (side key attachment positions 422a, 422b). Of the portions that are not the portions to which the side keys 322a and 322b are attached, the side of the circuit board 35 corresponding to the side to which the side keys 322a and 322b are attached is provided with a concave portion of the cover 31 as shown in FIGS. Other protrusions 351d and 351e are provided for locking to 311a and 311b. On the other hand, on the side of the circuit board 35 corresponding to the side to which the side key is not attached, as shown in FIGS. 2 and 6, a protrusion 351a for engaging with the notches 332a, 332b, 332c of the metal plate 33. , 351b, 351c are provided to disperse the impact when dropped.

  As described above, in the mobile phone 10 including the side keys 322a and 322b provided on the side surface of the lower housing 3, the cover 31 includes the recesses 311a and 311b on the inner side of the side surface on which the side keys 322a and 322b are provided. The metal plate 33 has notches 332a, 332b, and 332c formed in a standing portion 331a opposite to the side surface on which the side keys 322a and 322b are provided.

  According to this configuration, the mechanical strength of the metal plate 33 to which the side keys 322a and 322b are attached is maintained, and when the side keys 322a and 322b are pressed, the force is not easily transmitted to the circuit board 35, As a whole of the housing 3, it is possible to provide a mobile phone 10 that is highly resistant to impacts such as dropping while being thinned.

  The other protrusion 351e is locked to the recess 311b of the cover 31 and is also locked to the end 361 of the upright portion 331b of the metal plate 33. This is because it is relatively far from the side key 322b. On the other hand, the other protrusion 351d that is relatively close to the side key 322a is not locked to the standing portion 331b of the metal plate 33.

  In the above-described configuration, instead of the protrusions 351a, 351b, 351c of the circuit board 35 and the notches 332a, 332b, 332c of the metal plate 33, conversely, protrusions are provided on the metal plate, and the protrusions of the circuit board are provided to the protrusions. You may make it the structure which engages the recessed part provided in the end surface.

  In the above-described configuration, instead of the other projections 351d and 351e of the circuit board 35 and the recesses 311a and 311b of the cover 31, a recess is provided on the cover and the recess provided on the end surface of the circuit board with respect to this projection. You may make it the structure which engages.

Next, the circuit board 35, the metal plate 33, the shield lid 34, and the like will be described in more detail with reference to FIG. 2, FIG. 4, FIG.
On the main surface of the circuit board 35, a high-frequency circuit including a transmission / reception unit of the cellular phone 10, an analog circuit that performs various signal processing, a digital circuit, and the like are formed. Chassis frames 352 and 353 are attached to the main surface of the circuit board 35. The chassis frames 352 and 353 can be divided into a chassis outer frame 352 and a chassis inner frame 353. The chassis frames 352 and 353 are in contact with the outer frame portion (chassis outer frame 352) disposed in the vicinity of the outer edge of the circuit board 35, and the outer frame portion (chassis outer frame 352) and the outer frame portion (chassis outer frame 352). And an inner frame portion (chassis inner frame 353) that divides the region surrounded by. The chassis outer frame 352 is erected on the circuit board 35 so as to surround the circuit on the circuit board 35.

  According to this configuration, the chassis frame (chassis outer frame 352) erected so as to surround the circuit on the circuit board 35 surrounds the circuit on the circuit board 35, so that the shielding performance against the circuit can be more reliably exhibited. It becomes possible to do so. Further, since the area is divided into a plurality of areas, the shielding property between the circuits on the circuit board 35 can be improved. Moreover, since shielding can be performed at a closer position, the shielding performance itself is also good. Here, the shapes of the chassis frames 351 and 352 are not limited to this structure, and can be changed as appropriate.

  The shield lid 34 has cut and raised pieces 341 and 342 that elastically contact the chassis frames 352 and 353. The cut and raised pieces 341 and 342 are disposed at positions facing the inner frame portion (chassis inner frame 353) of the chassis frame, and are elastically contacted with the inner frame portion. Among these, the cut and raised piece 341 is formed by cutting and raising into a V-shaped shape toward the center at the peripheral portion of the shield lid 34. On the other hand, in the central portion of the shield lid 34, the cut and raised piece 342 is formed by cutting and raising into a V-shaped shape toward the outside. Further, the cut and raised pieces 341 and 342 each have a small protrusion T in the vicinity of the tip.

  According to this configuration, when the shield cover 34 having the cut-and-raised pieces 341 and 342 that elastically contact the chassis frames 352 and 353 is used, the key button (switch unit 321) is pressed or shocked. However, since the ground connection between the metal plate 33 and the circuit board 35 can be ensured, a reliable shielding effect can be obtained and the shock absorbing property can be enhanced. In addition, since the cut and raised pieces 341 and 342 that are provided corresponding to the chassis frame (chassis inner frame 353) and elastically contact are used, even if the metal plate 33 is somewhat warped or distorted, The cut and raised pieces 341 and 342 can reliably contact the chassis frame (chassis inner frame 353), exhibit shielding performance, and improve shock-absorbing properties. Further, since the peripheral portion of the shield cover 34 is cut and raised in a V-shape toward the center (cut-and-raised piece 341), even if the shield cover is warped or distorted, the chassis frame (chassis inner frame 353). ) And the cut and raised piece 341 can be more stable and reliable. Further, since the center portion of the shield cover 34 is cut and raised in an outward V-shape (cut-and-raised piece 342), even if the shield cover 34 is warped or distorted, the chassis frame (inside the chassis) A more stable and reliable electrical contact between the center portion of the frame 353) and the cut and raised piece 342 can be obtained. Further, since the cut and raised pieces 341 and 342 each have a small protrusion T in the vicinity of the tip, a reliable contact state can be obtained by point contact. The small protrusions T can be formed very easily and without the addition of materials if formed by punching.

  A hole h is formed in the metal plate 33 so as to avoid a position facing the high-frequency circuit mounted on the circuit board 35. According to this structure, since the hole h is provided in the metal plate 33, weight reduction can be achieved. Further, the metal plate 33 forms a hole h avoiding a position facing a high frequency circuit mounted on the circuit board 35. According to this configuration, since the hole h is provided in the metal plate 33 so as to avoid the position facing the high frequency circuit, it is possible to reduce noise and the like while reducing shield noise and the like due to high frequency. it can. The holes h may not be provided, and the density of the holes h may be adjusted as appropriate according to the weight and strength.

  As described above, according to the mobile phone 10 of the present embodiment, the thickness of the mobile phone 10 can be reduced by using the metal plate 33 as a shield member and making the metal plate 33 thinner. In addition, the circuit board 35 is locked to the cover 31 constituting a part of the housing (lower housing 3) and the metal plate 33 to disperse the impact at the time of dropping or the like, thereby providing high impact resistance. A mobile phone 10 can be provided. Further, with such a configuration, the mobile phone 10 can be assembled with good workability and at low cost.

  Further, according to the mobile phone 10 of the present embodiment, the mechanical strength of the portion to which the side keys 322a and 322b are attached is maintained, and when the side key is pressed, the force is not easily transmitted to the circuit board 35, As a whole casing (lower casing 3), it is possible to provide a mobile phone 10 that is highly resistant to impacts such as dropping while being thinned.

  Furthermore, according to the mobile phone 10 of the present embodiment, the key button (switch unit) can be obtained by using the shield cover 34 having the cut and raised pieces 341 and 342 that elastically contact the chassis frame (chassis inner frame 353). 321) Since the ground connection between the metal plate 33 and the circuit board 35 can be ensured even when subjected to pressing, impact, or the like, a reliable shielding effect can be obtained and the shock-absorbing property can be improved. Can do.

  In the mobile terminal device of the present invention, a metal plate is used as the shield member, and the thickness of the mobile terminal device can be reduced by thinning the metal plate. In addition, it is possible to provide a mobile terminal device with high impact resistance by engaging the circuit board with a cover and a metal plate that constitute a part of the housing and dispersing the impact when dropped. Further, with such a configuration, the mobile terminal device can be assembled with good workability and at low cost. For these reasons, the present invention can be applied to mobile terminal devices including mobile phones, PHS, PDAs and the like.

1 is an overall schematic diagram of a mobile phone as a mobile terminal device according to a first embodiment of the present invention. (A) is a perspective view which shows the state which closed the upper and lower housing | casing, (b) is a perspective view which shows the state (opening side state) which opened the upper housing | casing. FIG. 3 is an exploded perspective view of the lower housing of the mobile phone according to Embodiment 1 (viewed from the front side). 1 is an exploded perspective view of the lower housing of the mobile phone according to Embodiment 1 (viewed from the back side). FIG. 3 is an enlarged view of a circuit board, a shield cover, and a metal plate of the mobile phone according to Embodiment 1 of the present invention (viewed from the back side). FIG. 2 is an enlarged view (viewed from the front side) of the assembled metal plate, circuit board, and shield cover of the mobile phone according to Embodiment 1 of the present invention. The figure which shows a mode that what attached the shield cover to the main surface of the circuit board of the mobile telephone which concerns on Embodiment 1 of this invention was stored in the metal plate (the figure seen from the back side) FIG. 5 is a diagram showing a state in which a main plate of a circuit board of the cellular phone according to Embodiment 1 of the present invention with a shield cover attached to a metal plate is housed in a cover together with a key sheet (viewed from the back side) (Figure)

Explanation of symbols

10 Mobile phone (mobile terminal device)
2 Upper housing 3 Lower housing 4 Hinge portion 41 Hinge shaft 30 Lower housing 31 Cover 32 Key sheet 33 Metal plate 34 Shield lid 35 Circuit board 36 Sub circuit board 37 Case 38 Battery lid 39 Battery pack 311a, 311b Recess 331a, 331b Standing portion 332a, 332b, 332c Notch 351a, 351b, 351c Projection 351d, 351e Other projection 361 End 352 Chassis outer frame 353 Chassis inner frame 341, 342 Cut-up piece

Claims (2)

A case constituting a part of the housing;
A cover that constitutes a part of the housing and has a first recess and a second recess on the inside;
A metal plate that is housed in the housing and has a first upright portion having a notch formed in the periphery and a second upright portion formed on a side opposite to the first upright portion. When,
The has a first projection on the side which faces corresponding to the notch, before SL have a second projection on the side which faces corresponding to the first recess, and said second protrusion A circuit board having a third protrusion at a position corresponding to the second recessed portion and corresponding to the end of the second upright portion ,
With
The circuit board is fixed to said first projection on said metal plate by engaged in the notch, fixed front Stories second projections on the cover by engaged in the first recess In addition, the mobile phone fixed to the cover by being locked to the metal plate and locked to the second recess by locking the third protrusion to the end of the second upright portion. Terminal device. The mobile terminal according to claim 1,
A side key provided on a side surface of the housing;
The cover has the first recess on the inner side of the side key provided side;
The said metal plate is a portable terminal device by which the said notch was formed in the said 1st standing part on the opposite side to the side surface in which the said side key was provided.

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