JP2008022417A - Mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device which suppresses temperature elevation within a case by diffusing locally generated heat over a thermal diffusion sheet, by transferring the diffused heat from the thermal diffusion sheet to the approximately overall area of the case, and by speedily radiating the heat from the approximately overall area of the case to an external space. <P>SOLUTION: Thermal diffusion sheets are disposed on approximately overall areas of inner surfaces of a first case and a second case, a thermal diffusion sheet for connection is also disposed on a hinge portion, the plurality of thermal diffusion sheets disposed on the first case and the second case are integrally connected by the thermal diffusion sheet for connection, and heat generated in the first case or the second case is transferred to the first case and the second lower case by the thermal diffusion sheets, and radiated from the first case and the second case to the external space. Projections are provided to the surface of the thermal diffusion sheet to increase a surface area, recesses to which the projections of the thermal diffusion sheet are fitted, are provided on the inner surface of the case, and the projections on the thermal diffusion sheet are tightly fitted into the recesses on the case, thereby increasing a contact area for heat transfer transferring the heat from the thermal diffusion sheet to the case. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile terminal device such as a mobile phone in which a heat diffusion sheet is incorporated in a housing in order to release heat generated in an electronic component or the like in the housing to the outside.

  In a conventional portable terminal device such as a cellular phone, when used for a long time, an electronic component such as a CPU (Central Processing Unit) and an electric circuit housed in the casing generate heat and the temperature in the casing rises. In particular, a local temperature rise is not preferable in terms of the performance of the mobile terminal device and the life of the electronic component, as well as uncomfortable feeling when the housing is held by hand. Therefore, in the conventional portable terminal device, the method of suppressing the local temperature rise using a thermal diffusion sheet is taken.

  FIG. 13 shows a conceptual diagram of a foldable mobile phone 600 which is one of conventional mobile terminal devices. In FIG. 13, for the sake of simplicity, the upper housing 601 and the lower housing 602, the hinge portion 603 that connects them is indicated by a broken line, and the specific portion 604 that generates heat and the heat diffusion sheet 605 are indicated by a solid line. In the foldable mobile phone 600, heat locally generated in the specific portion 604 of the lower casing 602 that generates a lot of electronic components and electric circuits is diffused by the heat diffusion sheet 605 attached to the lower casing 602. Here, as the thermal diffusion sheet 605, a sheet obtained by bonding an insulating sheet such as a 0.1 mm polyethylene terephthalate sheet to both sides of a 0.1 mm graphite sheet is used. In another conventional mobile phone, a secondary battery or the like incorporated in a lower housing is used instead of a heat sink to diffuse local heat generation.

In this type of heat diffusion sheet, the heat diffusion sheet is not built in the upper housing that has few devices that cause temperature rise. A method has been proposed in which heat generated is received by a heat receiving portion, heat is transferred from a heat conduction path member formed integrally with the heat receiving portion to the upper housing, and heat is radiated from the heat radiating portion of the upper housing to the outside. (For example, refer to Patent Document 1).
Japanese Unexamined Patent Publication No. 2000-232284 (5th page, FIG. 1)

  However, in the conventional configuration, local heat generation in the casing of the mobile terminal device can be reduced, but when the heat generation amount as the device increases, the heat amount of the entire casing increases, and the allowable temperature of the user is increased. The range may be exceeded.

  Taking a foldable mobile phone as an example of a conventional portable terminal device, a CPU and a power supply LSI that generate heat are generally mounted in a lower casing, and a camera, LCD, etc. are mounted on the upper casing. For example, an electronic component that generates less heat than the electronic component mounted on the lower housing is mounted. Therefore, when the temperature rise distribution of the entire folding mobile phone is measured, the high temperature rise portion is concentrated on the lower casing. Since the power consumption of each electronic component will increase with the evolution of applications in the future, there is a limit to the method of dissipating heat generated by disposing a heat diffusion sheet in the lower housing.

  In addition, heat generated in the lower housing that generates a large amount of heat is moved to the upper housing that generates a small amount of heat. Regarding the idea, there is a limit to let the heat generated in the lower housing escape to the upper housing by the heat conduction of the heat conduction path member.

  The present invention expands the heat dissipation space that suppresses the temperature rise of the device only by structural measures, and realizes the heat generation countermeasure for the entire device without reducing the operating frequency and other specifications to suppress the heat generation amount To do.

  That is, the present invention quickly diffuses local heat generated in the casing of the mobile terminal device, transmits the heat to the casing, and quickly dissipates the heat from the casing to the outside. The first challenge is to prevent the generation of excessive heat.

  Then, in the portable terminal device including the two cases of the upper case and the lower case, the case in which local heat generation occurs quickly radiates heat and other cases with relatively little heat generation. The second problem is to suppress local heat generation by quickly radiating the heat from other housings to the outside using the heat diffusion space.

  In order to solve the above-described conventional problems, in the portable terminal device of the present invention, the heat diffusion sheet is disposed over substantially the entire inner surface of each of the first casing and the second casing and is connected to the hinge portion. The heat diffusion sheet is disposed, and the heat diffusion sheets of the first housing and the second housing are integrally connected by the connection heat diffusion sheet.

  With this configuration, heat generated in the first casing or the second casing is transmitted to the first casing and the second casing by the heat diffusion sheet, and the first casing and the second casing are transmitted. The heat can be quickly radiated from the outer surface to the external space.

  Further, the present invention provides a heat diffusion sheet on the inner surface of the casing of the mobile terminal device, increases the surface area by providing a protrusion on the surface of the heat diffusion sheet, and the protrusion of the heat diffusion sheet is provided on the inner surface of the casing. A recessed part to be fitted is provided, and the convex part of the heat diffusion sheet is brought into close contact with the concave part of the casing to increase the contact area for heat transfer from the thermal diffusion sheet to the casing, and to reduce the heat generated inside the casing. The heat diffusion sheet is transmitted from the housing to the housing and radiated from the housing to the external space. In addition, a convex portion is provided on the outer surface of the casing to increase the surface area, thereby increasing the amount of heat released from the outer surface of the casing.

  With this configuration, local heat generated inside the casing of the mobile terminal device is quickly diffused, transmitted to the casing, and quickly radiated from the casing to the outside.

  Moreover, the portable terminal device of the present invention is further provided with a vent hole penetrating from the inner surface to the outer surface of the housing, and configured to radiate heat from the vent hole.

  With this configuration, local heat generated inside the casing of the mobile terminal device is quickly diffused by the heat diffusion sheet and quickly radiated from the vent hole.

  According to the present invention, locally generated heat is diffused to the thermal diffusion sheet, the diffused heat is transmitted from the thermal diffusion sheet to substantially the entire area of the casing, and heat is quickly radiated from the substantially entire area of the casing to the external space. Thus, the temperature rise in the housing can be suppressed.

  In the portable terminal device having the first casing and the second casing, the heat diffusion space can be expanded not only in the second casing but also in the first casing. As a result, there is an effect that it is possible to realize a heat generation countermeasure for the entire device without reducing specifications such as a decrease in operating frequency in order to suppress the heat generation amount.

  Hereinafter, a mobile phone, which is one of mobile terminal devices, will be described with reference to the drawings. In addition to the so-called straight-type mobile phone comprising a single case, the mobile phone includes a foldable mobile phone in which two cases are foldably connected, and a slide-type mobile phone in which two cases are slidably connected. Although there are types of telephones and the like, a slide-type mobile phone is considered as a kind of a foldable mobile phone, and among these types of mobile phones, a foldable mobile phone will be described as a representative example.

(Embodiment 1)
FIG. 1 is a perspective view of a foldable mobile phone 100 according to the first embodiment of the present invention. In the foldable mobile phone 100, an upper casing 101 that is a first casing and a lower casing 102 that is a second casing are connected by a hinge portion 103. In FIG. 1, the upper casing 101, the lower casing 102, and the hinge portion 103 are indicated by broken lines in order to show the internal configuration and for easy understanding, and electronic components and prints stored in the casing are shown. The illustration of the substrate and the like is omitted. On the inner surface of the lower housing 102, the lower housing heat diffusion sheet 105 is fixed in close contact. The lower casing heat diffusion sheet 105 is brought close to or in contact with the heat generating section 104 with high power consumption, and diffuses the heat generated by the heat generating section 104 throughout the lower casing.

  Similarly, the upper casing heat diffusion sheet 107 is also tightly fixed to the inner surface of the upper casing 101. The hinge part 103 is connected to the lower casing thermal diffusion sheet 105 and the upper casing thermal diffusion sheet 107 through a connecting thermal diffusion sheet 106 bent in an S-shape. The connection heat diffusion sheet 106 is arranged at the hinge portion that connects the upper and lower housings, so that it has high flexibility, and a material having high thermal conductivity is used like each heat diffusion sheet. Therefore, the heat diffusion sheet 105 for the lower housing and the heat diffusion sheet 107 for the upper housing use materials having high thermal conductivity, and the connection heat diffusion sheet 106 uses materials that are resistant to repeated bending. One insulating sheet is bonded to the surface to form an integral heat diffusion sheet.

  The size of the lower casing heat diffusion sheet 105 is set to cover almost the entire inner surface of the lower casing 102. The reason why the size of the lower casing heat diffusion sheet 105 is increased is that the heat of the heat generating portion 104 is diffused throughout the lower casing 102 by the lower casing heat diffusion sheet 105. The size of the upper casing heat diffusion sheet 107 is also set so as to cover substantially the entire area of the inner surface of the upper casing 101. As for the width of the heat diffusion sheet 106 for connection, as much heat as possible is transferred from the heat diffusion sheet 105 for the lower housing to the heat diffusion sheet 107 for the upper housing as the maximum width through which the hinge portion can pass. ing. In the present invention, the area of the heat diffusing sheet 105 for the lower casing and the heat diffusing sheet 107 for the upper casing that diffuses heat has a width corresponding to substantially the entire area of the inner surface of the upper and lower casings, It is diffused in the upper and lower casings and is diffused from the upper and lower casings to the external space.

  In addition, as shown in FIG. 2, the present invention extends the front end 105a of the lower casing heat diffusion sheet by bending it along the inner surface of the front end portion of the lower casing, or extends the front end of the upper casing heat diffusion sheet. 107a may be bent and expanded along the inner surface of the tip portion of the upper casing. In this case, the amount of heat released from the upper casing and the lower casing increases. In particular, since the tip portion of the lower housing 102 and the tip portion of the upper housing 101 are corner portions, the surface area of the housing is large and the heat dissipation efficiency is high. It can dissipate heat. Similarly, the side surface portion of the housing also forms a corner portion, has a large surface area, and has high heat dissipation efficiency. Therefore, the side end 105b of the lower housing heat diffusion sheet 105 extends along the inner surface of the side surface portion of the lower housing. The amount of heat released from the lower housing can be increased by bending and extending.

(Embodiment 2)
Next, a mobile phone which is one of the mobile terminal devices will be described with respect to the mobile terminal device according to the second embodiment of the present invention. In the mobile phone according to the second embodiment, a convex portion is provided on the surface of the heat diffusion sheet to increase the surface area, and a concave portion in which the convex portion of the heat diffusion sheet is fitted is provided on the inner surface of the housing. The contact area for heat transfer for transferring heat from the heat diffusion sheet to the housing is increased by bringing the convex portion into close contact with the concave portion of the housing.

  FIG. 3 shows a schematic cross-sectional view of a mobile phone 200 according to the second embodiment of the present invention. The mobile phone 200 in FIG. 3 is a foldable mobile phone. The same parts as those of the mobile phone according to the first embodiment of the present invention are denoted by the same reference numerals and description thereof is omitted. The upper housing 101 rotates counterclockwise in FIG. 3 with the hinge portion 103 as a rotation axis, and can be folded as indicated by a two-dot chain line. In FIG. 3, for easy understanding, the cross-sectional thicknesses of the lower casing thermal diffusion sheet 105 and the upper casing thermal diffusion sheet 107 are enlarged to the same extent as the casing thickness. .

  In FIG. 3, the lower housing heat diffusion sheet 105 and the upper housing heat diffusion sheet 107 are provided with a plurality of convex portions 105 c and a plurality of convex portions 107 c on the surface facing the inner surface of the housing. The thermal diffusion sheet used in the present invention has a convex portion on one surface as a thermal diffusion sheet in which an insulating sheet such as a 0.1 mm polyethylene terephthalate sheet is bonded to both sides of a 0.1 mm graphite sheet. The height of the convex portion provided on the surface of the thermal diffusion sheet is scheduled to be around 0.1 mm to 0.3 mm, but depending on the degree of heat to be diffused, if necessary, the thickness of the convex portion or higher You may make it high. Although only the cross section is shown about the individual shape of the convex part, the convex part 105c and the convex part 107c may each be provided as a rod-shaped protrusion, and may be provided as a plate-shaped protrusion.

  On the other hand, the inner surface of the lower housing 102 and the upper housing 101, that is, the inner surface is provided with a plurality of concave portions 102d and a plurality of concave portions 101d into which the convex portions 105c and the convex portions 107c are fitted. The convex part 105c fits into the concave part 102d and comes into close contact therewith. Further, the convex portion 107c fits into the concave portion 101d and comes into close contact therewith. Then, heat is transferred to the lower casing 102 and the upper casing 101 from the flat portions of the lower casing thermal diffusion sheet 105 and the upper casing thermal diffusion sheet 107, and the convex portions 105c and 107c, respectively. . As a result, the heat generated in the heat generating part 104 is transmitted in all directions, up, down, left, and right, front and rear, as indicated by arrows. However, the heat transmitted to the heat diffusion sheet is the lower case heat diffusion sheet 105 and the connection heat diffusion sheet. 106, and diffused into the upper casing heat diffusion sheet 107, the lower casing thermal diffusion sheet 105, the flat portion of the upper casing heat diffusion sheet 107, the convex portion 105c, and the convex portion 107c to the lower casing 102 and the upper casing Each is transmitted to the casing 101 and is radiated from the lower casing 102 and the upper casing 101 to the outside air.

  In the mobile phone 200 according to the second embodiment, convex portions 101e and 102e are provided on the outer surfaces of the upper casing 101 and the lower casing 102, that is, the outer surfaces, respectively. In addition, in order to clarify the part shown by the code | symbol, in FIG. 4, the fragmentary sectional view of the thermal diffusion sheet 105 for lower housing | casings and the sectional view of the lower housing | casing 102 are distinguished and shown. By providing the convex portions 101e and 102e on the outer surface of the housing, the surface area where the upper housing 101 and the lower housing 102 are in contact with the outside air, that is, the heat radiation area increases, the heat radiation amount increases, and the heat radiation efficiency increases. In the mobile phone shown in FIG. 3, the positions of the convex portions 101 e and 102 e of the upper housing 101 and the lower housing 102 are the positions of the convex portions 105 c of the lower housing heat diffusion sheet 105 and the upper housing heat diffusion sheet 107. It is easy to radiate heat according to the position of the convex portion 107c.

  As described above, the lower casing thermal diffusion sheet 105 and the upper casing thermal diffusion sheet 107 are adhered and adhered along the inner surfaces of the upper casing 101 and the lower casing 102 so that the size of the casing of the mobile phone is increased. Without changing the thickness, the heat diffusion sheet and the outer surface of the housing can be made like a fin structure of a general heat radiating plate, so that the heat radiating surface area can be enlarged and the temperature rise of the device can be suppressed.

  In the mobile phone according to the present invention, a thermal diffusion sheet is also arranged in the upper casing 101 where the temperature rise is smaller than that of the lower casing 102, and this is connected to the flexible thermal diffusion for connection with the same high thermal conductivity. Since the sheet 106 is integrally connected, the temperature increase that has been concentrated on the lower casing 102 until now can be diffused to the upper casing 101 of the mobile phone, and often touches the user. The temperature rise of the housing 102 can be suppressed without the control of the CPU clock and the complicated power management of each device. Regarding the attachment of the heat diffusion sheet, the lower casing 102 is usually attached to the back surface opposite to the key operation surface, and the mobile phone upper case 101 is attached to the back surface opposite to the main LCD display surface.

  In the present invention, various modifications can be adopted with the form shown in FIG. 3 as a basic form. For example, as shown in FIG. 5, the front end portion 105a of the lower casing heat diffusion sheet 105 is expanded by folding along the inner surface of the front end portion of the lower casing, or the front end section 107a of the upper casing heat diffusion sheet. Is expanded along the inner surface of the front end portion of the upper housing, and heat is transmitted from the front end portions 105a and 107a to the lower housing 102 and the front end portion of the upper housing 101, Heat may be radiated from the front end portion of the upper housing 101 to the outside air. In FIG. 5, a convex portion 105c is further provided at the tip portion 105a obtained by folding and expanding the heat diffusion sheet for the lower casing, a concave portion 102d corresponding to the lower casing 102 is provided, and a convex portion is provided on the outer surface of the lower casing. 102e is provided to promote heat dissipation from the tip portion.

  In the present invention, as shown in FIG. 6, fine pitch unevenness 211 and unevenness 212 may be provided on the outer surfaces of the upper housing 101 and the lower housing 102. Heat dissipation from the upper housing 101 and the lower housing 102 is promoted by the unevenness 211 and the unevenness 212. As shown in FIG. 7, if the upper casing 101 and the lower casing 102 have convex portions 101e and 102e, the convex portions of the lower casing thermal diffusion sheet 105 and the upper casing thermal diffusion sheet 107 Even if the convex portion is small, in the extreme case, even if the convex portion is not provided on the heat diffusion sheet, heat dissipation from the housing is promoted.

  Further, as shown in FIG. 8, by providing vent holes 101h at the end of the upper casing and vent holes 102h, 102i, and 102j at the end of the lower casing, the heat of the connecting heat diffusion sheet is passed through these holes. Heat can be radiated from the pores.

(Embodiment 3)
FIG. 9 is a schematic cross-sectional view of a mobile phone 300 that is one of the mobile terminal devices, relating to the mobile terminal device according to the third embodiment of the present invention. A cellular phone 300 in FIG. 9 is a so-called straight-type cellular phone, and houses an electronic component, an electric circuit, and the like (not shown) in one casing 301.

  In FIG. 9, the housing heat diffusion sheet 307 is provided with a plurality of convex portions 307 c on the inner surface of the housing, that is, on the side facing the inner surface of the housing. Although only a cross section is shown in FIG. 9, the convex portion 307c may be provided as a rod-like protrusion or a plate-like protrusion. On the other hand, the inner surface of the housing 301 is provided with a concave portion 301d into which the convex portion 307c is fitted. The convex part 307c fits into the concave part 301d and comes into close contact therewith. The heat of the heat generating portion 104 is transmitted to the housing heat diffusion sheet 307 and diffused, is transmitted from the flat portion of the housing heat diffusion sheet 307 and the convex portion 307c to the housing 301, and is radiated from the housing 301 to the outside air. .

  Note that in the mobile phone 300 of FIG. 9, a convex portion 301 e is provided on the outer surface of the mobile phone casing 301, that is, on the outer surface of the casing 301. By providing the convex portion 301e on the outer surface of the housing, the surface area in contact with the outside air of the housing 301, that is, the heat radiation area increases, the heat radiation amount increases, and the heat radiation efficiency increases.

(Embodiment 4)
Next, a mobile phone which is one of the mobile terminal devices will be described with respect to the mobile terminal device according to the fourth embodiment of the present invention. FIG. 10 is a schematic cross-sectional view showing the structure of a foldable mobile phone 400 according to the fourth embodiment of the present invention. In FIG. 10, the same reference numerals are used for the same parts as those shown in the drawings and the description thereof is omitted.

  In the foldable mobile phone 400 according to the fourth embodiment of the present invention, a plurality of vent holes 410 are provided in a portion where the heat diffusion sheet 105 of the lower housing 102 is stuck and fixed to the housing. In the vent hole 410 of the lower housing 102, the heat diffusion sheet 105 directly touches the outside air. The cellular phone 400 configured as described above releases heat from the vent hole 410 by bringing the heat diffusion sheet that rises in temperature into contact with the outside air, thereby suppressing the temperature rise of the lower housing 102.

  In the foldable mobile phone 400 according to the fourth embodiment of the present invention, since the ventilation hole 410 is provided in the casing, there is a possibility that dust, moisture, etc. may enter from the ventilation hole 410. Therefore, a sheet having good air permeability for preventing ingress of dust and moisture may be attached. FIG. 11 shows a schematic cross-sectional view when a sheet with good air permeability is attached. In FIG. 11, a vent hole 410 is provided in the lower housing 102, and a highly breathable sheet 420 is attached to the inner surface of the lower housing 102 where the vent hole 410 is provided to prevent entry of dust and moisture. A heat diffusing sheet 105 for the lower housing is provided on the top. As a result, there is no entry of dust and moisture that may enter from the vent hole 410 by the sheet 420, so that the opening area of the vent hole 410 can be enlarged and a greater heat dissipation effect can be obtained.

  Further, as another method for preventing the entry of dust and moisture from the vent hole, as shown in the schematic cross-sectional view of FIG. 12, the cover 500 is lowered so that the cover 500 is located slightly away from the vent hole 410. It may be provided integrally with the housing 102 so that the vent hole 410 is not blocked by a hand or another object. The cover 500 prevents dust and moisture from entering through the air holes while maintaining contact between the heat diffusion sheet and the outside air. In this structure, the vent hole 410 is not blocked by a hand or other objects, and the opening area of the vent hole 410 can be enlarged, so that a more effective heat dissipation effect can be obtained.

  The built-in structure of the thermal diffusion sheet that suppresses the local temperature rise of the portable terminal device according to the present invention, even when the amount of heat generated in the electric circuit is larger than the conventional case, Since it can be suppressed without the control of the clock and the complicated power management of each device, it can be applied to small electronic devices that require heat dissipation.

The perspective view which shows arrangement | positioning of the thermal-diffusion sheet | seat of the portable terminal device concerning 1st embodiment of this invention. The perspective view which shows arrangement | positioning of the thermal diffusion sheet of the other portable terminal device concerning 1st embodiment of this invention. Sectional drawing of the portable terminal device concerning 2nd embodiment of this invention The exploded sectional view of the personal digital assistant device concerning a second embodiment of the present invention. Sectional drawing of the other portable terminal device concerning 2nd embodiment of this invention Sectional drawing of the other portable terminal device concerning 2nd embodiment of this invention Sectional drawing of the other portable terminal device concerning 2nd embodiment of this invention Sectional drawing of the other portable terminal device concerning 2nd embodiment of this invention Sectional drawing of the portable terminal device concerning 3rd embodiment of this invention Sectional drawing of the portable terminal device concerning 4th Embodiment of this invention Sectional drawing of the other portable terminal device concerning 4th Embodiment of this invention implementation Sectional drawing of the other portable terminal device concerning 4th Embodiment of this invention implementation The perspective view which shows arrangement | positioning of the thermal diffusion sheet of the conventional portable terminal device

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Upper housing | casing 102 Lower housing | casing 101d, 102d Concave part 101e, 102e Convex part 101h, 102h, 102i, 102j Air vent 103 Hinge part 104 Heat generating part 105 Thermal diffusion sheet for lower casings 106 Thermal diffusion sheet for connection 107 Upper casing Thermal diffusion sheet 105c, 107c Convex part 211 Concave part 410 Vent hole 420 Sheet 500 Cover

Claims (10)

In the mobile terminal device in which the first housing and the second housing are connected by a hinge portion,
A heat diffusion sheet is disposed over substantially the entire inner surface of each of the first housing and the second housing, and a connection heat diffusion sheet is disposed in the hinge portion;
A portable terminal device, wherein the plurality of thermal diffusion sheets respectively disposed in the first casing and the second casing are integrally connected by the connection thermal diffusion sheet. The mobile terminal device according to claim 1,
Furthermore, the thermal diffusion sheet is bent and extended along the inner surface of the end portion of the first casing or the second casing. The mobile terminal device according to claim 1,
The portable terminal device further comprises a vent hole in the vicinity of an end of the first casing or the second casing. A portable terminal device provided with a thermal diffusion sheet on the inner surface of a housing,
Protruding portions are provided on the surface of the thermal diffusion sheet,
A recess is provided on the inner surface of the housing to fit the protrusion of the heat diffusion sheet,
A portable terminal device, wherein the convex portion of the thermal diffusion sheet is in close contact with the concave portion of the casing. A portable terminal device provided with a thermal diffusion sheet on the inner surface of a housing,
A portable terminal device, wherein irregularities are formed on an outer surface of the casing. The mobile terminal device according to claim 4,
A convex part is formed on the outer surface of the housing,
A portable terminal device, wherein the position of the convex portion formed on the outer surface of the casing and the position of the convex portion of the heat diffusion sheet provided on the inner surface of the casing overlap. A portable terminal device provided with a thermal diffusion sheet on the inner surface of a housing,
A portable terminal device comprising a ventilation hole penetrating from the inner surface to the outer surface of the housing. The portable terminal device according to claim 7, wherein a breathable sheet is provided inside the ventilation hole of the casing. The portable terminal device according to claim 7, wherein a vent cover is provided outside the vent of the casing. A portable terminal device provided with a thermal diffusion sheet on the inner surface of a housing,
The casing is composed of a first casing and a second casing, and the first casing and the second casing are foldably connected by a hinge portion, and
A thermal diffusion sheet is disposed on the inner surface of each of the first casing and the second casing;
Furthermore, a thermal diffusion sheet for connection is arranged on the hinge part,
The plurality of heat diffusion sheets respectively disposed in the first housing and the second housing are connected by the connection heat diffusion sheets. Mobile terminal device.

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