JP2007199930A - Portable terminal equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal equipment which is miniaturized and whose circuit board protection is enhanced. <P>SOLUTION: The portable terminal equipment has a circuit board mounted with electronic parts, a cover protecting the circuit board, and a case accommodating the circuit board and the cover. The cover covers at least one board surface and at least parts of the both sides of the circuit board. Preferably, the cover has a plate arranged along at least one board surface of the circuit board, and an erected wall set to the plate and arranged along the side of the circuit board toward another board surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal device such as a mobile phone. Specifically, the present invention relates to a portable terminal device with enhanced protection of a circuit board.

  FIG. 1 is a perspective view of a mobile terminal device, and FIG. 10 is a cross-sectional view taken along line AA of FIG. FIG. 10 is a schematic cross-sectional view of a conventional mobile terminal device 21. The portable terminal device 21 fixes a first housing 22 and a second housing 30 for the purpose of internal protection and design, a key 23, a key pedestal 24, a metal dome 25 for transmitting a signal by key operation, and a metal dome 25. A sheet 26 with a pressure-sensitive adhesive, a flexible board 27 for transmitting an electrical signal, a circuit board 29 on which an electronic component 33 such as a memory is mounted, a cover 28 that protects the circuit board 29, a battery 31, and a battery cover 32. .

  In the conventional form shown in FIG. 10, the cover 28 is a plate-like body bent on both sides, and has a U-shaped cross section. The cover 28 is disposed on the circuit board 29, and the side end of the standing wall 28 a of the cover 28 is in contact with the circuit board 29. The cover 28 and the circuit board 29 are held in combination with the first casing 22 and the second casing 30 together with the key 23, the key base 24, the flexible board 27, and the like. For example, in the portable terminal described in Patent Document 1, the reinforcing plate electromagnetic wave shield is arranged so that the side end contacts the printed board.

JP 2000-151132 A

FIG. 11 shows an enlarged view of the right part of FIG. In the configuration in which the cover 28 is disposed on the circuit board 29 as shown in FIG. 10, the cover 28 is likely to be rattled by an external impact. Shaking of the cover 28 may damage the electronic component 33 on the circuit board 29 adjacent to the standing wall 28a of the cover 28. Therefore, in order to prevent damage to the electronic components 33, it is necessary to increase the distance d ₂ between the vertical wall 28a and the electronic component 33 of the cover 28. For example, in a conventional portable terminal device 21, the distance _{d 2} is taken 1.2Mm～1.5Mm. Furthermore, in order to arrange the cover 28 on the circuit board 29, a space (distance d ₃ ) for supporting the cover 28 is required on the outer edge of the circuit board 29. Therefore, in the configuration in which the cover 28 is disposed on the circuit board 29, the downsizing of the mobile terminal device is impaired by the peripheral space of the circuit board 30.

Further, the end portion of the standing wall 28 a of the cover 28 is in direct contact with the circuit board 29. Therefore, when an impact is applied from the outside of the housings 22 and 30, the impact is transmitted to the circuit board 29, and the circuit board 29 itself may be damaged. Therefore, the first housing 22 and the second housing 30, for securing the strength against an impact from outside, vertical wall 22a, the need to increase the thickness _{t 3} of 30a. For example, in a conventional portable terminal device 21, the thickness _{t 3} is about 2.5 mm. That is, downsizing of the mobile terminal device is also impaired by the thickness of the standing walls 22a and 30a of the first housing 22 and the second housing 30.

  According to the basic form of the present invention, it has a circuit board on which an electronic component is mounted, a cover that protects the circuit board, and a housing that houses the circuit board and the cover, and the cover is at least one of the circuit boards. Provided is a portable terminal device covering at least a part of a substrate surface and side surfaces on both sides.

  According to a preferred form of the basic form, at least a part of the cover straddles the circuit board. According to another preferred embodiment, the cover covers both sides of the board surface of the circuit board and both side faces.

  According to a preferred form of the above basic form, the cover is disposed along the board surface of at least one of the circuit boards, and the circuit board is erected on the plate-like body and faces the other board surface. And a standing wall disposed along the side surface of the first wall.

  According to a preferred form of the basic form, at least two covers are combined with the standing walls facing each other. According to a further preferred form, at least two covers are combined by fitting the standing walls together. According to another preferred form, the cover is a tubular body.

  According to a preferred form of the basic form, the circuit board is press-fitted and held on the cover. According to another preferred embodiment, the cover is pressed and held with the end portion of the standing wall or the plate-like body in contact with the housing. According to another preferred embodiment, the circuit board has a convex portion on the side surface, and the cover has a concave portion fitted to the convex portion on the standing wall. According to another preferred embodiment, the cover further includes a spacer for maintaining a distance from the circuit board. According to another preferred form, the cover is electrically connected to the ground of the circuit board.

  According to the present invention, since the cover is not disposed on the circuit board, it is possible to prevent the cover from damaging the electronic component or the circuit board. Thereby, the distance of the electronic component on a circuit board and the standing wall of a cover can be shortened. Furthermore, the space of the circuit board for supporting the standing wall of the cover can be reduced. Therefore, the width of the circuit board can be reduced, and thereby the mobile terminal device can be reduced in size. Further, according to the present invention, the cover can receive an external force acting on the housing. For this reason, the thickness of a housing | casing can be made thin and a portable terminal device can be reduced in size also by this.

  FIG. 2 is an exploded schematic view showing the internal structure of the button side (lower side) of the mobile terminal device shown in FIG. Moreover, it is AA sectional drawing of the portable terminal device shown in FIG. 1, and the schematic sectional drawing which concerns on 1st Embodiment of this invention is shown in FIG. The lower side of the portable terminal device 1 of the present invention includes a first housing 2, a key 3, a key pedestal 4, a sheet 6 with an adhesive provided with a metal dome 5, a flexible substrate 7, a cover 8, a circuit substrate 9, and a second housing. It has a body 10, a battery 11, and a battery cover 12. The circuit board 9 is covered with a cover 8. On the cover 8, the flexible substrate 7, the key pedestal 4, the key 3, and the like are arranged. The cover 8 and the key 3 on the cover 8 are fixed by combining the first housing 2 and the second housing 10. The circuit board 9 and the flexible board 7 are connected by a connector or the like (not shown).

  In the present invention, the cover is for covering at least a part of at least one board surface and both side faces of the circuit board in order to protect the circuit board. As long as the cover has a desired strength, any material may be used. The material of the cover is preferably a metal, but may be a resin or a ceramic. When the cover is formed of a material other than metal, it is preferable to plate the surface of the cover in order to protect the circuit board from static electricity. The thickness of the cover is appropriately set in consideration of the space occupied by the cover and the strength, and is preferably 0.2 mm to 0.4 mm, more preferably 0.25 mm to 0.35 mm.

  FIG. 4 is a perspective view of the cover 8. 4 is a view of the cover 8 shown in FIG. 2 as viewed from the back side, and shows a cover applicable to the embodiment shown in FIG. FIG. 5 shows an enlarged view of the right end portion of the schematic cross-sectional view shown in FIG. The cover 8 shown in FIG. 4 is provided with a plate-like body 8d arranged along one board surface of the circuit board 9, and the plate-like body 8d, and the side surface of the circuit board 9 toward the other board surface. And a standing wall 8a disposed along the wall. The shape of the cover 8 has such a shape that the periphery (both sides) of the plate-like body is bent, and the cross section has a U-shape as shown in FIG. In the embodiment shown in FIG. 3, the plate-like body 8 d of the cover 8 and the standing wall 8 a straddle the circuit board 9 to cover the upper surface of the circuit board 9 and the side surfaces (outside) on both sides of the circuit board 9. The circuit board 9 is arranged in the cover 8, and preferably, at least a part of the side surface of the circuit board 9 abuts against the standing wall and is press-fitted and held on the cover 8. An end 8 b of the standing wall 8 a of the cover 8 is in contact with the inner surface of the second housing 10, and the cover 8 is pressed and held by the first housing 2 and the second housing 10.

  As shown in FIG. 2, a part 8 c of the standing wall 8 a of the cover 8 is located on the circuit board 9. In the form shown in FIG. 2, convex portions 9 a are formed on both sides of the circuit board 9. The convex portion 9 a is fitted into the concave portion 8 c of the standing wall 8 a of the cover 8 when the cover 8 is put on the circuit board 9 from the board surface direction. Thereby, the position of the cover 8 with respect to the circuit board 9 is determined, and at the same time, the displacement of the cover 8 is prevented.

  The engagement of the convex portion 9a of the circuit board 9 and the concave portion 8c of the standing wall 8a can cause the standing wall 8a to function as a spacer. Thereby, a gap can be interposed so that the electronic component 13 mounted on the circuit board 9 and the plate-like body 8d of the cover 8 do not contact each other. Further, even when the convex portion 9a and the concave portion 8c are not engaged, the standing wall 8e can be caused to function as a spacer by bringing the standing wall 8e into contact with the circuit board 9. Even if the standing walls 8a and 8e do not function as spacers, by providing spacers (not shown) on both sides of the circuit board 9 and / or on the second casing, the electronic component 13, the cover 8, and the second casing are provided. Contact with 10 can also be prevented.

According to this configuration, even if the cover 8 rattles due to an impact received by the mobile terminal device 1, the electronic component 13 on the circuit board 9 is not damaged. Therefore, the distance d ₁ between the electronic component 13 located on the outer edge of the circuit board 9 and the standing wall 8a of the cover 8 can be shortened as compared with the configuration in which the cover is disposed on the circuit board. The distance d ₁ depends on the target device, but can be 0.5 mm to 0.7 mm in the case of a mobile phone, for example. Furthermore, according to this configuration, it is possible to reduce the circuit board periphery of the space to support the vertical wall 8a of the cover 8 (the distance d ₃ shown in FIG. _11). Thus, the distance d ₂ + d ₃ shown in FIGS. 10 and 11 can be reduced to d ₁ (d ₁ <d ₂ ) shown in FIG. Thereby, for example, the width of the circuit board, which was about 40 mm in the conventional portable terminal device, can be reduced to about 38 mm. Accordingly, the width of the mobile terminal device can be reduced by about 2 mm.

Further, according to this configuration, since the cover 8 can receive the impact received by the casings 2 and 10, it is possible to prevent the circuit board 9 from being damaged. Therefore, the thickness t ₁ of the standing wall portions of the housings 2 and 10 can be reduced as compared with the configuration in which the cover is disposed on the circuit board. Although the thickness t ₁ depends on the target device, it can be set to 1.4 mm to 1.5 mm in the case of a mobile phone, for example.

  FIG. 6 is a cross-sectional view taken along line AA of the mobile terminal device shown in FIG. 1, and shows a schematic cross-sectional view according to the second embodiment of the present invention. FIG. 7 shows an enlarged view of the right portion of the schematic cross-sectional view shown in FIG. In this configuration, the two covers 8 and 14 cover the both side surfaces and the upper and lower substrate surfaces of the circuit board 9 with the standing walls 8a and 14a being combined face to face. In the form shown in FIG. 6, the upper cover 8 is fitted into the lower cover 14 so that the standing wall 8a and the standing wall 14a overlap, but the positional relationship between the two covers is not limited to this form. For example, the lower cover can be fitted into the upper cover, or the same width covers can be combined alternately.

  In the second embodiment shown in FIGS. 6 and 7, the plate-like body of the cover 14 is in contact with the second housing 10, and the end portion of the standing wall 8 a of the cover 8 is in contact with the inner surface of the cover 14. The covers 8 and 14 are pressed and held by the first housing 2 and the second housing 10. The gap between the electronic component 13 and the covers 8 and 14 can be formed in the same manner as in the first embodiment.

According to this configuration, by providing the cover 14 on the second housing 10 side of the circuit board 9, the thickness t ₂ of the second housing 10 portion between the circuit board 9 and the battery 11 is reduced. Can do. In particular, by making the size for reducing the thickness of the portion of the second housing 10 larger than the thickness of the lower cover 14, the entire portable terminal device can be made thinner. Furthermore, the strength of the covers 8 and 14 is improved by the double standing walls.

  Another form of the cover according to the portable terminal device of the present invention is shown in FIG. The cover 8 in the form shown in FIG. 8A is a tubular cover and is formed of one member. The cover 8 has two plate-like bodies 8d arranged along one board surface of the circuit board 9 and two plates 8d standing on the plate-like body 8d and arranged along the side surface of the circuit board 9. And a standing wall 8a. The covers 8 and 14 in the form shown in FIG. 8B have the same shape as the covers in the first and second embodiments, respectively. The difference from the second embodiment is that the covers 8 and 14 are, as in the combination of the first housing 2 and the second housing 10, the end of the standing wall 8 a of the upper cover 8 and the standing wall of the lower cover 14. Combined with the end of 14a. According to this configuration, even if the circuit board has a convex portion as shown in FIG. 2, by forming the window portion that fits the convex portion in the combined cover, the positions of the convex portions are formed by both covers. Can be fixed. For example, in the form shown in FIG. 8B, the window is formed by the concave portion 14 c of the lower cover 14. Furthermore, it is preferable that the covers 8 and 14 are formed with convex portions and concave portions (not shown) to be fitted so that the combined covers 8 and 14 are not displaced. Moreover, the covers 8 and 14 may have a notch part or a perforation part (through-hole) in the plate-like body or standing wall of the cover as long as the strength can be maintained.

  In the configuration according to the first embodiment and the second embodiment shown in FIGS. 3 and 6, the electronic component is prevented from static electricity entering from the outside of the housing by electrically connecting at least one cover to the ground of the circuit board. Etc. can be protected. For example, the cover and the circuit board can be connected by mounting a coiled or leaf spring type contact component on the ground surface of the circuit board 9, or the plate-like body 8d surface or the standing wall 8a surface of the cover 8. FIG. 9 shows a schematic cross-sectional view of a contact component that electrically connects the cover 8 and the circuit board 9. The contact component 15 is a leaf spring made of a generally U-shaped metal. The contact component 15 ensures contact by projecting a portion in contact with the cover 8.

  The form of the cover according to the portable terminal device of the present invention is not limited to the above embodiment, and can be further modified and improved as long as it is within the scope of the present invention.

  In the above description, the present invention has been described by taking the key side (lower side) structure of a foldable portable terminal device as an example. However, the present invention is not limited to the structure on the lower side, but can be applied to a display-side (upper side) structure or a portable terminal device other than the folding type. Furthermore, the present invention is not limited to a mobile phone, PHS, and PDA, but can be applied to a mobile terminal device including a circuit board and a cover.

The perspective view of one Embodiment of a portable terminal device. The disassembled perspective view of one Embodiment of the portable terminal device of this invention. 1 is a schematic cross-sectional view according to a first embodiment of the present invention (A-A cross-sectional view in FIG. 1). The perspective view of the cover concerning a 1st embodiment of the present invention. The enlarged view of the right end part of the schematic sectional drawing shown in FIG. The schematic sectional drawing (AA sectional drawing of FIG. 1) which concerns on 2nd Embodiment of this invention. The enlarged view of the right end part of the schematic sectional drawing shown in FIG. The perspective view which shows another embodiment of the cover which concerns on the portable terminal device of this invention. The schematic sectional drawing which shows one Embodiment of the contact component which connects a cover and a circuit board. The schematic sectional drawing of the conventional portable terminal device (AA sectional drawing of FIG. 1). The enlarged view of the right end part of the schematic sectional drawing shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal device 2 1st housing | casing 2a Standing wall 3 Key 4 Key base 5 Metal dome 6 Adhesive sheet 7 Flexible board 8 Cover 8a Standing wall 8b End part 8c Recessed part 8d Plate-like body 8e Standing wall 9 Circuit board 9a Convex part 10 2 housing 10a Standing wall 11 Battery 12 Battery cover 13 Electronic component 14 Cover 14a Standing wall 14c Recess 14e Standing wall 15 Contact component 21 Mobile terminal device 22 First housing 22a Standing wall 23 Key 24 Key pedestal 25 Metal dome 26 Adhesive sheet 27 Flexible Substrate 28 Cover 28a Standing wall 29 Circuit board 30 Second housing 30a Standing wall 31 Battery 32 Battery cover 33 Electronic component

Claims (12)

A circuit board on which electronic components are mounted; a cover that protects the circuit board; and a housing that houses the circuit board and the cover,
The portable terminal device, wherein the cover covers at least a part of at least one substrate surface and both side surfaces of the circuit board.   The mobile terminal device according to claim 1, wherein at least a part of the cover straddles the circuit board.   The portable terminal device according to claim 1, wherein the cover covers both sides of the substrate surface of the circuit board and both side surfaces.   The cover has a plate-like body disposed along the at least one board surface of the circuit board, and is erected on the plate-like body, along the side surface of the circuit board toward the other board surface. The portable terminal device according to claim 1, further comprising a standing wall disposed.   The portable terminal device according to claim 4, wherein at least two of the covers are combined with the standing wall facing each other.   The portable terminal device according to claim 5, wherein at least two of the covers are combined by fitting the standing walls to each other.   The portable terminal device according to claim 3, wherein the cover is a tubular body.   The portable terminal device according to any one of claims 1 to 7, wherein the circuit board is press-fitted and held in the cover.   The portable terminal device according to any one of claims 4 to 8, wherein the cover has an end portion of the standing wall or the plate-like body pressed against and held by the housing. The circuit board has a convex portion on a side surface,
The portable terminal device according to any one of claims 4 to 9, wherein the cover has a concave portion fitted to the convex portion on the standing wall.   The portable terminal device according to any one of claims 1 to 10, wherein the cover further includes a spacer for maintaining a distance from the circuit board. The portable terminal device according to any one of claims 1 to 11, wherein the cover is electrically connected to a ground of the circuit board.

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