JP5905798B2 - Mobile device - Google Patents

Description

  The present invention relates to a mobile terminal having a display portion, and more particularly to a heat dissipation structure thereof.

  2. Description of the Related Art In recent years, a structure of a mobile terminal typified by a smartphone has a liquid crystal display arranged on the front side of one housing, a back side thereof covered with a sheet metal, and a main substrate or the like arranged on the back side of the sheet metal. In this case, since the flexible substrate extending from the liquid crystal display is disposed on the front side of the sheet metal, the sheet metal is moved to the back side in order to prevent the liquid crystal from being stressed due to the repulsive force of the bent flexible substrate and discoloring the screen. It was necessary to avoid it by depression.

  On the other hand, a communication portable terminal using a thermal diffusion sheet for diffusing heat generated in the portable terminal is known (for example, Patent Document 1).

JP 2008-22417 A

  However, since there is a step in the concave portion that accommodates the flexible substrate, the step portion is not stretched from the viewpoint of workability such as avoiding stress on the liquid crystal surface, sticking, assembling, and repairing the heat radiating sheet. There must be.

  However, countermeasures against heat generation have become extremely important as thinning and downsizing have progressed. With conventional methods of stretching a heat diffusion sheet, heat dissipation efficiency is not sufficient, and contact with the heating element is poor and heat diffusion is poor. There is a problem of inefficiency.

  The present invention has been made in view of the above points, and an object of the present invention is to enable efficient diffusion of heat within a portable terminal without causing discoloration of the screen.

  In order to achieve the above object, in the present invention, the flexible substrate is disposed on the back side of the metal plate, and the thermal diffusion sheet is disposed so as to cover the metal plate and the flexible substrate.

Specifically, in the first invention,
A display unit housing having a metal plate and containing a display unit on the front side of the metal plate;
A flexible substrate extending from the display unit and folded back to the back side of the metal plate;
A thermal diffusion sheet that continuously covers the back side of the metal plate and the back side of the flexible substrate ;
It has a flexible container for accommodating the flexible substrate on the front side, and a substrate holder for supporting a main substrate having a heating element on the back side,
A part of the thermal diffusion sheet is sandwiched between the back surface of the substrate holder and the main substrate .

According to said structure, since the flexible substrate of a display unit is extended to the back side of the metal plate, the repulsive force of a flexible substrate is not applied to the display unit of a front side, and the screen of a display unit does not discolor. Further, since not only the back surface of the metal plate but also the back surface of the flexible substrate can be continuously covered with a single heat diffusion sheet, the number of components is reduced and the attachment is facilitated. Further, since a wider area can be covered with the heat diffusion sheet, the heat diffusion efficiency is improved, and heat does not accumulate in a part of the portable terminal, and the user does not feel uncomfortable. Further, the flexible substrate can be stably accommodated by the substrate holder that supports the main substrate, and the heat of the main substrate having the heating element can be effectively diffused by the heat diffusion sheet with the heat diffusion sheet interposed therebetween. .

In the second invention, in the first invention,
Of the heat diffusion sheet, the portion sandwiched between the substrate holders is not bonded, and the back surface portion of the metal plate is bonded to the back surface of the metal plate.

  According to the above configuration, repair replacement, recycling, and the like are facilitated by sandwiching the heat diffusion sheet between the substrate holder and the main substrate without bonding the portion sandwiched between the substrate holders.

In the third invention, in the second invention,
Of the thermal diffusion sheet, the substrate holder side of the portion sandwiched between the substrate holders is covered with a cushion member.

  According to said structure, when a heat diffusion sheet is inserted | pinched, a cushion member deform | transforms and a heat diffusion sheet closely_contact | adheres to a main board | substrate, Therefore A heat diffusion effect improves.

In the fourth invention, in the third invention,
The heating element of the main substrate is covered with a substrate-side sheet metal, and the substrate-side sheet metal is in contact with a portion of the heat diffusion sheet that is sandwiched between the substrate holders.

  According to the above configuration, by covering the heating element with the substrate-side sheet metal, the heat generated from the heating element is effectively transmitted to the substrate-side sheet metal, and the heat diffusion sheet is in close contact with the substrate-side sheet metal. Spreads over the entire thermal diffusion sheet and diffuses over a wide area.

In the fifth invention, in any one of the second to fourth inventions,
The substrate holder has a sheet metal part, and a plate spring for grounding the metal plate is formed on the sheet metal part.

  According to said structure, the adhesiveness of a thermal diffusion sheet improves with the repulsive force of a leaf | plate spring, and thermal diffusion and grounding are performed efficiently.

As described above, according to the present invention, the folded flexible substrate extending from the display unit on the back side of the metal plate, not covered with the back of the back metal plate of the flexible substrate by thermal diffusion sheet, the backside of the substrate holder Since a part of the heat diffusion sheet is sandwiched between the main board and the main board, the heat can be efficiently diffused in the portable terminal without causing discoloration of the screen.

It is a front view which shows the substrate holder which concerns on embodiment of this invention, a thermal diffusion sheet, and its periphery. It is a front view which shows a mobile telephone. It is the disassembled perspective view which looked at the mobile telephone from the front side. It is the disassembled perspective view which looked at the mobile telephone from the back side. It is the perspective view which looked at the front side cabinet and the flexible substrate from the back side. The substrate holder is shown, (a) is a perspective view seen from the front side, (b) is a perspective view seen from the back side. FIG. 4A is a perspective view of the main substrate, viewed from the front side, and FIG. 5B is a perspective view viewed from the back side. The thermal diffusion sheet is shown, (a) is a perspective view seen from the front side, (b) is a perspective view seen from the back side.

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

  2 to 4 show a mobile phone 1 as a mobile terminal according to an embodiment of the present invention, and the mobile phone 1 has a front-side cabinet 3 as a display unit housing that houses a display unit 2. The back side of the front side cabinet 3 is covered with a back side cabinet 4, and the back side is covered with a rear cover 5. A rechargeable battery 6 and a main board 7 are accommodated between the front side cabinet 3, the back side cabinet 4 and the rear cover 5.

  As shown in FIG. 5, the front cabinet 3 is insert-molded with a metal plate 8 made of a stainless steel plate, an aluminum molded product, a magnesium molded product, or the like at the center.

  The display unit 2 is housed in a display unit housing portion 3a (shown only in FIG. 2) formed of a resin frame on the front side of the metal plate 8. The flexible substrate 9 extending from the upper end of the display unit 2 is folded back on the upper back side of the metal plate 8. The flexible substrate 9 may be folded back from either the left or right end.

  The folded flexible substrate 9 is accommodated in the substrate holder 10. Specifically, as shown in FIG. 6A, the substrate holder 10 is made of an insert-molded product having a rectangular sheet metal part 11 and a resin part 12 covering the sheet metal part 11. On the front side of the substrate holder 10, the flexible substrate 9 is accommodated in a flexible accommodating portion 14 in which the sheet metal portion 11 is exposed and lowered from the resin portion 12 (see FIG. 1). For this reason, the overall thickness of the mobile phone 1 is suppressed. As shown in FIG. 6B, a plurality of locking claws 12a for locking the main board 7 are formed in the resin portion 12 on the back side. As described above, complicated shapes such as the locking claws 12a are integrally formed in the resin portion 12, and the sheet metal portion 11 is formed thin, so that a complicated shape can be formed while suppressing the overall thickness. Yes. In addition, the metal sheet metal part 11 exhibits heat dissipation and grounding functions.

  A plate spring 15 as a first grounding member is formed on the sheet metal part 11. The plate spring 15 is formed by cutting and raising a part of the sheet metal portion 11, and the height thereof is higher than the thickness of the resin portion 12, and is formed in the region of the resin portion 12 as shown in FIG. The two plate springs 15 are configured to be exposed from the opening 12 b of the resin portion 12 and to contact the metal plate 8. If it is a leaf | plate spring, since it can form at the time of the press molding of the sheet metal part 11, attachment is unnecessary, and since it has a spring property, it can conduct efficiently.

  On the other hand, as shown in FIG. 6 (b), conductive gaskets 16 as second grounding members are affixed to both the left and right sides on the upper rear side of the sheet metal part 11. For example, the conductive gasket 16 is formed by covering the foam layer with copper foil, aluminum foil, or the like. With such a conductive gasket, it is possible to adhere to the main substrate 7 in a wide range without reducing the strength of the sheet metal part 11. The portion of the conductive gasket 16 may also be constituted by a large leaf spring cut and raised to the back side.

  As shown in FIG. 7, the main substrate 7 has a large number of electronic components such as a CPU as a heating element, and the front side is covered with a substrate-side sheet metal 17 formed by press-forming, for example, a 0.1 mm stainless steel plate. . Although not shown, the substrate-side sheet metal 17 is fitted into a metal frame provided on the main substrate 7. As shown in FIGS. 1 and 8, an upper portion 18 a of the thermal diffusion sheet 18 is sandwiched between the substrate-side sheet metal 17 and the sheet metal part 11. The thermal diffusion sheet 18 includes, for example, graphite having high thermal diffusibility, and the back side is covered with a sheet 18c such as PET for reinforcement or the like.

  On the other hand, the lower portion 18b of the thermal diffusion sheet 18 is exposed from the substrate holder 10 and bonded to the metal plate 8 as shown in FIG. As shown in FIG. 8, notches 18 d are provided at the left and right upper ends of the upper portion 18 a so as to avoid the conductive gasket 16. The upper portion 18 a is not bonded by being sandwiched between the substrate holder 10 and the substrate-side sheet metal 17, and the back side of the substrate holder 10 is covered with a thin cushion member 19. The cushion member 19 is deformed when the heat diffusion sheet 18 is sandwiched by the repulsive force of the leaf spring 15 and the heat diffusion sheet 18 is in close contact with the main substrate 7, so that the heat diffusion effect is improved.

  The upper portion 18a comes into contact with the substrate-side sheet metal 17, so that the heat in the substrate-side sheet metal 17 is diffused. Further, the conductive gasket 16 abuts on the substrate-side sheet metal 17, whereby the main substrate 7 is grounded to the sheet metal part 11, and as a result, is grounded to the metal plate 8 via the plate spring 15.

  Thus, since the flexible substrate 9 of the display unit 2 is extended to the back side of the metal plate 8, the repulsive force of the flexible substrate 9 is not applied to the display unit 2 on the front side, and the screen of the display unit 2 is not discolored.

  Further, since not only the back surface of the metal plate 8 but also the back surface of the flexible substrate 9 can be continuously covered with the single heat diffusion sheet 18, the number of components is reduced and the attachment is facilitated. Furthermore, since a wider range can be covered with the heat diffusion sheet 18, the heat diffusion efficiency is improved, and heat does not accumulate in a part of the mobile phone 1 so that the user does not feel uncomfortable.

  In addition, the flexible substrate 9 can be stably accommodated by the substrate holder 10 that supports the main substrate 7, and the heat of the main substrate 7 having a heating element with the heat diffusion sheet 18 interposed therebetween is more effective by the heat diffusion sheet 18. Can diffuse.

  In addition, the portion of the thermal diffusion sheet 18 that is sandwiched between the substrate holders 10 is not bonded, and is sandwiched between the substrate holder 10 and the main substrate 7, thereby facilitating repair replacement, recycling, and the like.

  Further, by covering the heating element with the substrate-side sheet metal 17, heat generated from the heating element is effectively transmitted to the substrate-side sheet metal 17, and the heat diffusion sheet 18 is in close contact with the substrate-side sheet metal 17. It spreads over the entire thermal diffusion sheet 18 and diffuses over a wide area. Further, since the substrate-side sheet metal 17 is grounded by the conductive gasket 16, it can be grounded in a wide range.

  Further, in order to avoid discoloration of the screen of the display unit 2, a substrate holder 10 is disposed on the front side of the flexible substrate 9 that is folded back on the back surface of the metal plate 8, and the main substrate 7 and the metal are placed on the sheet metal part 11 of the substrate holder 10. Since the plate spring 15 and the conductive gasket 16 for conducting the plate 8 are provided, the conductive gasket 16 and the heat diffusion sheet 18 are arranged in a narrow area of the substrate holder 10 because the conductive can be efficiently conducted in a limited space. As a result, the size of the mobile phone 1 does not increase. Furthermore, the repulsive force of the leaf spring 15 improves the adhesion of the thermal diffusion sheet 18, and thermal diffusion and grounding are performed efficiently.

  As described above, according to the present invention, heat can be efficiently diffused in the mobile phone 1 without causing discoloration of the screen. In addition, the grounding can be reliably performed with a compact and simple structure.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the said embodiment, although the mobile telephone 1 is made into the shape which has one housing | casing, it is not limited to this, The structure which folds a some housing | casing may be sufficient. In this case, the present invention can be applied to the housing side having the display unit.

  In the above embodiment, the mobile terminal is a mobile phone, but it may be a PHS (Personal Handy-phone System), a PDA (Personal Digital Assistant), a smartphone, a personal computer, a mobile tool, an electronic dictionary, a calculator, a game machine, or the like. Good.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

  As described above, the present invention is useful for a mobile terminal such as a mobile phone having a display unit.

1 Mobile phone (mobile terminal)
2 Display unit 3 Front-side cabinet (display housing)
3a Display unit accommodating portion 4 Rear side cabinet 5 Rear cover 6 Rechargeable battery 7 Main substrate 8 Metal plate 9 Flexible substrate 10 Substrate holder 11 Sheet metal portion 12 Resin portion 12a Locking claw 12b Opening portion 14 Flexible accommodating portion 15 Plate spring (first ground) Element)
16 Conductive gasket (second grounding member)
17 Board side metal plate 18 Thermal diffusion sheet 18a Upper part 18b Lower part 18c Sheet 18d Notch part 19 Cushion member

Claims (5)

A display unit housing having a metal plate and containing a display unit on the front side of the metal plate;
A flexible substrate extending from the display unit and folded back to the back side of the metal plate;
A thermal diffusion sheet that continuously covers the back side of the metal plate and the back side of the flexible substrate ;
It has a flexible container for accommodating the flexible substrate on the front side, and a substrate holder for supporting a main substrate having a heating element on the back side,
A portable terminal, wherein a part of the thermal diffusion sheet is sandwiched between a back surface of the substrate holder and the main substrate . The mobile terminal according to claim 1 ,
A portable terminal, wherein a portion of the heat diffusion sheet sandwiched between the substrate holders is not bonded, and a back surface portion of the metal plate is bonded to the back surface of the metal plate. The mobile terminal according to claim 2 ,
A portable terminal, wherein a portion of the heat diffusion sheet sandwiched between the substrate holders is covered with a cushion member on the substrate holder side. The mobile terminal according to claim 3 ,
The portable terminal, wherein the heating element of the main substrate is covered with a substrate-side sheet metal, and the substrate-side sheet metal is in contact with a portion of the heat diffusion sheet that is sandwiched between the substrate holders. The mobile terminal of any one of claims 2 to 4,
The portable terminal according to claim 1, wherein the substrate holder has a sheet metal part, and a plate spring for grounding the metal plate is formed on the sheet metal part.

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