JP2014029918A - Portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal which radiates heat of a battery charger placed on the rear surface side of a metal frame and enables some expansion of the battery charger to be allowed.SOLUTION: A battery charger 7 is provided between a front surface side cabinet 3 having a metal frame 6 and a main substrate 8. An entire periphery of a front surface of the battery charger 7 is covered by a heat conductive double sided tape 10, and the heat conductive double sided tape 10 is applied to the metal frame 6. A space between the metal frame 6 and the battery charger 7 in the heat conductive double sided tape 10 is filled with a heat conductive grease 11.

Description

  The present invention relates to a portable terminal such as a mobile phone having a rechargeable battery, and more particularly to heat dissipation around the rechargeable battery.

  A portable terminal having a rechargeable battery and a main board inside a casing is known. For example, in patent document 1, it accommodates in order of a liquid crystal display, a main board | substrate, a rechargeable battery, and a battery cover.

JP 2012-100033 A

  However, in the conventional portable terminal, since the rechargeable battery is disposed on the back side of the main board, the rechargeable battery cannot be widened when the peripheral edge of the battery cover is rounded and curved. It was.

  Therefore, in recent years, there is a need to attach a rechargeable battery to the back side of a metal frame of a cabinet that accommodates a liquid crystal display and arrange the rechargeable battery at the center in the thickness direction so that the width is as large as possible.

  In this case, since the main board | substrate with a heat generation source is arrange | positioned in the back side of a rechargeable battery, there existed a problem that the heat of a rechargeable battery or a main board | substrate was hard to radiate. Moreover, when the rechargeable battery swells, there is a risk of pressing the main board having precision parts.

  The present invention has been made in view of this point, and an object of the present invention is to dissipate heat from the rechargeable battery disposed on the back side of the metal frame and allow a slight swelling.

  In order to achieve the above object, in the present invention, the rechargeable battery is attached to a metal frame with a heat conductive double-sided tape.

Specifically, in the first invention,
A front cabinet having a metal frame;
A main board disposed on the back side of the front side cabinet;
A rechargeable battery disposed between the metal frame and the main board;
Covering the entire front edge of the rechargeable battery, thermally conductive double-sided tape attached to the metal frame,
Thermally conductive grease filled in a space between the metal frame inside the thermally conductive double-sided tape and the rechargeable battery is provided.

  According to the above configuration, the rechargeable battery is affixed to the metal frame with heat conductive double-sided tape, so there is a gap between the rechargeable battery inside the heat conductive double-sided tape and the metal frame, and even if the rechargeable battery expands slightly, the back Do not damage the main board on the side. Further, by filling the gap with thermally conductive grease, the heat of the rechargeable battery is transmitted to the metal frame together with the thermally conductive double-sided tape to dissipate the heat, and the heat does not accumulate on the main substrate side on the back side.

In the second invention, in the first invention,
The rechargeable battery is rectangular,
The heat conductive double-sided tape is attached so that four linear tapes are continuous in a rectangular frame shape.

  According to the above configuration, the material cost can be reduced as compared with a case where a rectangular frame is cut out from a single rectangular shape.

In the third invention, in the second invention,
The thermally conductive double-sided tape and the thermally conductive grease are blocked by a thermally conductive sealing material.

  According to the above configuration, the thermally conductive sealing material makes it difficult for the thermally conductive grease to leak to the thermally conductive double-sided tape side, and the sealing material itself is also thermally conductive, so the heat dissipation effect does not decrease.

  As described above, according to the present invention, the rechargeable battery and the metal frame are bonded with the heat conductive double-sided tape and the gap is filled with the heat conductive grease. The battery can dissipate heat and allow some swelling of the rechargeable battery.

FIG. 3 is an enlarged cross-sectional view taken along line II in FIG. 2. It is the 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 front side. It is the disassembled perspective view which looked at the mobile telephone from the back side. It is the disassembled perspective view which looked at the front side cabinet, the heat conductive grease, and the rechargeable battery from the back side.

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

  1 to 4 show a mobile phone 1 as a mobile terminal according to an embodiment of the present invention. The mobile phone 1 includes a front-side cabinet 3 into which a display unit 2 is fitted on the front side. The back side of the front cabinet 3 is covered with a back cabinet 4, and the back is covered with a rear cover 5.

  As shown in FIG. 1, the front cabinet 3 has a rectangular dish-shaped metal frame 6 inserted in the center. The metal frame 6 is made of a sheet metal such as a stainless steel plate, an aluminum alloy, or a magnesium alloy, or a molded product. The display unit 2 is accommodated on the front side of the metal frame 6. A rectangular plate-shaped rechargeable battery 7 is attached to the back side of the metal frame 6. A main substrate 8 is accommodated on the back side of the rechargeable battery 7.

  As a feature of the present invention, as shown in FIG. 5, the entire front peripheral edge of the rechargeable battery 7 is covered with a thermally conductive double-sided tape 10 having a rectangular frame shape. The heat conductive double-sided tape 10 has four linear double-sided tapes attached almost continuously so that there is as little gap as possible. In this case, the material cost can be reduced as compared with the case where the center is cut out into a rectangular frame shape. The heat conductive double-sided tape 10 has a predetermined thickness (for example, 0.2 mm) and includes a material having high heat conductivity such as graphite. A gap is formed between the front surface of the rechargeable battery 7 and the back surface of the metal frame 6 depending on the thickness of the thermally conductive double-sided tape 10. This gap is filled with thermally conductive grease 11. The heat conductive grease 11 is made of a silicon compound containing a material having high heat conductivity, and may be provided by painting. Further, a heat conductive sealing material 12 is provided on the inner periphery of the heat conductive double-sided tape 10 over the entire periphery. The heat conductive sealing material 12 is made of, for example, a synthetic rubber, an adhesive, or the like containing a material having high heat conductivity.

  With this configuration, the rechargeable battery 7 is affixed to the metal frame 6 with the thermally conductive double-sided tape 10, so that a gap is formed between the rechargeable battery 7 and the metal frame 6, and the back surface even if the rechargeable battery 7 swells somewhat. The main board 8 on the side is not damaged. Further, by filling the gap with the heat conductive grease 11, the heat of the rechargeable battery 7 is transmitted to the metal frame 6 together with the heat conductive double-sided tape 10 to dissipate the heat, and the heat does not accumulate on the main substrate 8 side on the back side. .

  Further, the heat conductive sealing material 12 makes it difficult for the heat conductive grease 11 to leak to the heat conductive double-sided tape 10 side, and the sealing material itself is also heat conductive, so the heat dissipation effect does not decrease.

  Therefore, according to the mobile terminal according to the present embodiment, the rechargeable battery 7 disposed on the back side of the metal frame 6 can dissipate heat, and some swelling of the rechargeable battery 7 can be allowed.

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

  That is, in the said embodiment, although the metal frame 6 was insert-molded in the resin-made front side cabinet 3, you may assemble | attach the separate metal frame 6 to the resin-made frame, and the front side cabinet 3 whole is a metal molded product. You may comprise.

  Moreover, in the said embodiment, although the rechargeable battery 7 was made into the rectangular plate shape, it is good also as a roundish plate shape. In that case, the heat conductive grease 11 may be attached along the periphery of the rechargeable battery 7.

  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 rechargeable battery and a main substrate.

DESCRIPTION OF SYMBOLS 1 Mobile phone 2 Display part 3 Front side cabinet 4 Back side cabinet 5 Rear cover 6 Metal frame 7 Rechargeable battery 8 Main board 10 Thermal conductive double-sided tape 11 Thermal conductive grease 12 Thermal conductive sealing material

Claims (3)

A front cabinet having a metal frame;
A main board disposed on the back side of the front side cabinet;
A rechargeable battery disposed between the metal frame and the main board;
Covering the entire front edge of the rechargeable battery, thermally conductive double-sided tape attached to the metal frame,
A portable terminal comprising heat conductive grease filled in a space between the metal frame inside the heat conductive double-sided tape and the rechargeable battery. The mobile terminal according to claim 1,
The rechargeable battery is rectangular,
The above-mentioned heat conductive double-sided tape is attached so that four linear things may be continued in the shape of a rectangular frame. The mobile terminal according to claim 2,
A portable terminal characterized in that a space between the thermally conductive double-sided tape and the thermally conductive grease is blocked by a thermally conductive sealing material.

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