JP2014116749A - Portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily radiate heat generated in a circuit board and easily remove a battery rechargeable battery.SOLUTION: A ground sheet 10 having a copper foil and a protective sheet for protecting the copper foil, is stuck to a back surface of a sheet plate frame 6. A nonslip sheet 11 for suppressing a movement of a rechargeable battery 7, is stuck to the ground sheet 10 side of the rechargeable battery 7, and a press cushion 12 which can compress in a thickness direction of the rechargeable battery 7, is arranged between the rechargeable battery 7 and a circuit board 8. The ground sheet 10 is folded up to a back surface side of the rechargeable battery 7, and is sandwiched between the press cushion 12 and the circuit board 8.

Description

  The present invention relates to a portable terminal in which a rechargeable battery is accommodated between a display unit and a circuit board.

  Conventionally, in a mobile terminal represented by a mobile phone, in order to facilitate replacement of the rechargeable battery, the rechargeable battery is accommodated in the casing in the order of the display unit, the circuit board, and the rechargeable battery (see, for example, Patent Document 1). ).

JP 2012-100034 A

  In recent years, smart phones have been distributed, and the display portions of mobile terminals have become larger and the overall thickness has become thinner.

  On the other hand, there is a request to increase the size of the rechargeable battery in order to improve the holding time of the rechargeable battery. For this reason, it is conceivable that the rechargeable battery is accommodated in the order of the display unit, the rechargeable battery, and the circuit board for the purpose of arranging the rechargeable battery at the center in the thickness direction in the casing having the rounded side surface.

  In this case, there is a problem that if the electronic components that require the grounding of the circuit board are individually grounded to the sheet metal frame on the back side of the display unit in the back of the rechargeable battery, the respective line widths are narrow and not reliably grounded.

  The present invention has been made in view of this point, and an object of the present invention is to make it possible to reliably ground the circuit board to the sheet metal frame with a simple configuration.

  In order to achieve the above object, in the present invention, both sides of the rechargeable battery are sandwiched between ground sheets.

Specifically, in the first invention,
A display unit;
A front-side cabinet that has a sheet metal frame and houses the display unit on the front side of the sheet metal frame;
A rechargeable battery disposed on the back side of the sheet metal frame;
A circuit board disposed on the back side of the rechargeable battery;
Coupled to the front cabinet, and a rear cabinet that houses the rechargeable battery and circuit board,
A grounding sheet having a conductor and a protective sheet for protecting the conductor is attached to the back surface of the sheet metal frame,
A non-slip sheet for suppressing the movement of the rechargeable battery is attached to the grounding sheet side of the rechargeable battery,
Between the rechargeable battery and the circuit board, a pressure cushion that is compressible in the thickness direction of the rechargeable battery is disposed,
The ground sheet is folded back to the back side of the rechargeable battery, and is sandwiched between the pressing cushion and the circuit board, and the circuit board and the sheet metal frame are grounded.

  According to the above configuration, the rechargeable battery is pressed against the sheet metal frame by the pressure cushion on the back side of the rechargeable battery, and the non-slip sheet attached to the rechargeable battery suppresses the movement of the rechargeable battery. The battery does not move and damage to the circuit board is prevented. And even if it does not earth | ground separately, it is reliably earth | grounded with respect to a circuit board in a wide area by the sheet of 1 sheet | seat pressed by the thickness direction with the press cushion.

  As described above, according to the present invention, a grounding sheet having a conductor and a protective sheet for protecting the conductor is attached to the back surface of the sheet metal frame, and the rechargeable battery is prevented from moving on the grounding sheet side. A non-slip sheet is affixed, a pressure cushion that can be compressed in the thickness direction of the rechargeable battery is placed between the rechargeable battery and the circuit board, and a folded grounding sheet is sandwiched between the pressure cushion and the circuit board. Accordingly, the circuit board can be reliably grounded with a simple configuration, and the rechargeable battery can be easily removed.

It is the II sectional view taken on the line of FIG. 2, and one part is expanded and shown. BRIEF DESCRIPTION OF THE DRAWINGS The mobile phone which concerns on embodiment of this invention is shown, (a) is the perspective view seen from the front, (b) is the perspective view seen from the back. It is the III-III line expanded sectional view of FIG. 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. A circuit board, a rechargeable battery, and a grounding sheet are shown, (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the back side. The grounding sheet is shown, (a) is a front view, (b) is a side view, and (c) is an exploded view.

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

  2A and 2B show the mobile phone 1 according to the embodiment of the present invention, in which FIG. 2A is a perspective view seen from the front, and FIG. 2B is a perspective view seen from the back. FIG. 1 is a cross-sectional view taken along the line II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is an exploded perspective view of the mobile phone 1 as viewed from the front side, and FIG. 5 is an exploded perspective view of the mobile phone 1 as viewed from the back side. The mobile phone 1 is a so-called smartphone and includes a display unit 2 having a touch panel on the front side (the display unit is indicated by a two-dot chain line). The display unit 2 is accommodated in the front cabinet 3. A back side cabinet 4 is coupled to the back side of the front side cabinet 3 with screws or the like (not shown), and the back side is covered with a rear cover 5. A sheet metal frame 6 made of a stainless steel sheet or the like is insert-molded in the front cabinet 3. The display unit 2 is accommodated in a display accommodating portion 3a formed by the sheet metal frame 6 and the resin portion around the frame.

  6A and 6B show a circuit board and a rechargeable battery, in which FIG. 6A is a perspective view seen from the front side, and FIG. 6B is a perspective view seen from the back side. A rectangular plate-shaped rechargeable battery 7 is arranged on the back side of the sheet metal frame 6. A circuit board 8 is disposed on the back side of the rechargeable battery 7, and the rechargeable battery 7 and the circuit board 8 are accommodated in a back side cabinet 4 coupled to the front side cabinet 3. The circuit board 8 is equipped with a large number of electronic components such as a CPU that serves as a heat source. The rechargeable battery 7 is composed of, for example, a lithium ion polymer secondary battery. A grounding sheet 10 is attached to the back surface of the sheet metal frame 6.

  FIG. 7 shows the grounding sheet 10, where (a) is a front view, (b) is a side view, and (c) is an exploded view. As shown in an exploded view in FIG. 7, the grounding sheet 10 includes a copper foil 14 as a conductor and a protective sheet 15 that protects the copper foil 14. The protective sheet 15 includes a graphite sheet 16 that is a heat conductive material having high heat conductivity, and has high heat transfer performance. The protective sheet 15 and the copper foil 14 are bonded by a double-sided adhesive tape 17. The copper foil 14 and the sheet metal frame 6 are attached to the sheet metal frame 6 with a conductive double-sided tape 18 in which a conductive member is mixed to ensure conductivity. Since the conductive double-sided tape 18 has conductivity, it is difficult to prevent electrical conduction between the copper foil 14 and the sheet metal frame 6.

  On the other hand, as shown in FIG. 4 and the like, a rectangular anti-slip sheet 11 that suppresses the movement of the rechargeable battery 7 is attached to the ground sheet 10 side (front side) of the rechargeable battery 7. The non-slip sheet 11 is made of a material having a large friction coefficient such as silicon rubber and is soft to a certain extent. The rechargeable battery 7 is prevented from moving in the vertical and horizontal directions with respect to the ground sheet 10 and can be deformed in the thickness direction. It has become.

  In the present embodiment, for example, only the upper side of the rechargeable battery 7 is attached to the grounding sheet 10 with a double-sided adhesive tape (not shown) for battery adhesion. The portion where the ground sheet 10 is attached to the rechargeable battery 7 does not have the conductive double-sided tape 18 and is not attached to the back surface of the sheet metal frame 6. In addition, this double-sided adhesive tape for battery bonding may not be attached.

  Moreover, as shown in FIG. 5 etc., between the rechargeable battery 7 and the circuit board 8, the press cushion 12 which can be compressed in the thickness direction of the rechargeable battery 7 is arrange | positioned. Specifically, the press cushion 12 is made of, for example, frame-shaped sheet-like urethane with a center cut out.

  As shown in FIG. 6, the grounding sheet 10 extends upward from the portion where it is bonded to the sheet metal frame 6, and is folded back to the back side of the rechargeable battery 7. The ground sheet 10 is sandwiched between the pressing cushion 12 and the circuit board 8 so as to cover the front and back surfaces of the rechargeable battery 7 from above. Since the pressing cushion 12 does not have a large coefficient of friction unlike the anti-slip sheet 11, the grounding sheet 10 folded back on the back surface can slide in the vertical and horizontal directions. The grounding sheet 10 is pressed against the circuit board 8 at the portion where the pressing cushion 12 abuts, and the back side of the copper foil 14 is grounded to the front side of the circuit board 8. In addition, the center of the press cushion 12 is cut out, so that the swelling of the rechargeable battery 7 can be allowed.

  And the part affixed to the sheet metal frame 6 by the electroconductive double-sided tape 18 of the front side of the grounding sheet 10 is provided with the extension part 10a extended in the left-right direction at the both ends of the width direction (left-right direction). The circuit board 8 is provided with a grounding point (not shown) in accordance with the extension 10a. The extension 10a is folded back to the circuit board 8 and grounded at the grounding point. Since the copper foil 14 can maintain a shape to some extent, the position of the grounding sheet 10 is not easily displaced by folding the extension 10a.

-Effect of the embodiment-
(1) According to the present embodiment, the rechargeable battery 7 is pressed against the sheet metal frame 6 by the pressing cushion 12 on the back side of the rechargeable battery 7, and the non-slip sheet 11 attached to the rechargeable battery 7 moves the rechargeable battery 7. Therefore, the rechargeable battery 7 does not move when dropped, and the circuit board 8 is prevented from being damaged. Moreover, since it is not necessary to firmly fix the rechargeable battery 7 with a double-sided tape or the like, it is very easy to remove the rechargeable battery 7. The circuit board 8 is reliably grounded by the grounding sheet 10 pressed in the thickness direction by the pressing cushion 12. For this reason, it is not necessary to ground each electronic component of the circuit board 8, and the grounding from the entire front side of the circuit board 8 is possible by the single ground sheet 10.

  (2) Extension portions 10a extending in the width direction are formed at both ends in the width direction of the portion of the ground sheet 10 attached to the sheet metal frame 6, and the extension portions 10a are grounded to the circuit board 8. . For this reason, since not only the folded part of the grounding sheet 10 but also the extended part 10a can be grounded from the back side of the circuit board 8 with the electronic components, further reliable grounding is possible.

  (3) The protective sheet 15 includes a heat conductive material, and is configured to be able to transfer heat of the circuit board 8 to the sheet metal frame 6. As described above, the protective sheet 15 of the grounding sheet 10 includes the heat conductive material, whereby the heat of the circuit board 8 is transmitted to the sheet metal frame 6 side by the grounding sheet 10. In this embodiment, since the copper foil 14 also has high heat conductivity, the copper foil 14 also plays a role of heat conduction. For this reason, it is possible to prevent the user from feeling uncomfortable or causing a malfunction due to heat accumulation.

  Therefore, according to the present embodiment, the circuit board 8 can be reliably grounded with a simple configuration.

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

  That is, in the said embodiment, although the conductor was the copper foil 14, other materials with sufficient electrical conductivity, such as silver foil and aluminum foil, may be sufficient.

  In the above embodiment, the mobile terminal is the mobile phone 1, but it may be a PHS (Personal Handy-phone System), a PDA (Personal Digital Assistant), a personal computer, a mobile tool, an electronic dictionary, a calculator, a game machine, or the like. .

  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. The technical features described in each embodiment can be combined with each other, and a new technical feature can be formed by combining them.

1 Mobile phone (mobile terminal)
2 display section
3 Front cabinet
3a Display container
4 Rear cabinet
5 Rear cover
6 Sheet metal frame
7 Rechargeable battery
8 Circuit board
10 Ground sheet
11 Non-slip sheet
12 Press cushion
14 Copper foil (conductor)
15 Protection sheet
16 Graphite sheet (thermal conductive material)
17 Double-sided adhesive tape
18 Conductive double-sided tape

Claims (3)

A display unit;
A front-side cabinet that has a sheet metal frame and houses the display unit on the front side of the sheet metal frame;
A rechargeable battery disposed on the back side of the sheet metal frame;
A circuit board disposed on the back side of the rechargeable battery;
Coupled to the front cabinet, and a rear cabinet that houses the rechargeable battery and circuit board,
A grounding sheet having a conductor and a protective sheet for protecting the conductor is attached to the back surface of the sheet metal frame,
A non-slip sheet for suppressing the movement of the rechargeable battery is attached to the grounding sheet side of the rechargeable battery,
Between the rechargeable battery and the circuit board, a pressure cushion that is compressible in the thickness direction of the rechargeable battery is disposed,
The portable terminal, wherein the grounding sheet is folded back to the back side of the rechargeable battery, sandwiched between the pressing cushion and the circuit board, and the circuit board and the sheet metal frame are grounded. The mobile terminal according to claim 1,
Extending portions extending in the width direction are formed at both ends in the width direction of the portion of the grounding sheet attached to the sheet metal frame, and the extending portions are grounded to the circuit board. Mobile terminal. The mobile terminal according to claim 1 or 2,
The portable terminal, wherein the protective sheet includes a heat conductive material, and is configured to transfer heat of the circuit board to the sheet metal frame.

Images