JP2007174469A - Portable information terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device for efficiently cooling an inside of a casing for a multifunctional portable information terminal device without impairing the appearance design.
In a portable information terminal device equipped with a heating element such as an LCD, an intake crossflow fan and an exhaust crossflow fan are arranged on both sides of the heating element, and the intake crossflow fan is connected to an intake port. The air is sucked, the sucked cold air is applied to the heating element, cooled, and the air warmed by cooling the heating element is discharged from the exhaust port by the exhaust crossflow fan.
[Selection] Figure 1

Description

  The present invention relates to a cooling device for portable information terminal equipment, and includes a mobile phone, a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), and the like.

  In recent years, mobile information terminal devices have been increasingly multifunctional to meet various needs, and various functions have been added from what has been a conventional call function. For example, there are models that have a built-in camera, take a picture, save the image, receive music distribution, enjoy listening to music, and have a built-in TV tuner to enjoy watching TV. It is coming.

  However, along with the increase in functionality of such portable information terminal devices and the prolonged continuous use time thereof, LCDs (Liquid Crystal Displays), driver ICs, and CPUs (Central Processing Units) built into the portable information terminal devices ) And the like, and the current consumption also increases, so that each component generates heat, and thus a cooling mechanism has become indispensable.

  For this reason, in general portable information terminal devices, countermeasures are taken against heat generation problems of LCDs, driver ICs, CPUs, and the like. For example, it is considered that a heat dissipation effect is achieved by attaching a cooling sheet having high thermal conductivity. In addition, it has been considered that a cooling effect is achieved by driving a motor including a cooling fan.

In addition, as shown in FIG. 5, a cooling fin is provided on the shaft of the incoming vibration motor 20 that is generally provided in a mobile phone so that the vibration motor 20 can be operated even when the electronic component 21 generates heat. In addition, it has been proposed that the electronic component 21 that generates heat is vibrated to easily diffuse the heat, and the cooling is performed by rotating the cooling fins to blow air to the electronic component 21 (Patent Document 1).
JP2004-074220A

  However, when cooling with a cooling device as described above, for example, a cooling sheet, the heat dissipation effect is limited, and it is difficult to sufficiently cool the heat generated by the multifunctional portable information terminal device. It is. In addition, a cooling fan (an axial fan, a sirocco fan, etc.) must be secured in its installation space, and is not suitable for portable information terminal devices that are becoming smaller.

  Further, in the cooling device as shown in Patent Document 1, since the cooling motor is provided with the cooling fin, vibration is generated at the same time when it is started. Further, since there is only one vibration motor as a fan, it is not sufficient for circulating the air in the housing. In other words, in order to sufficiently cool the heating element, it is necessary to suck in cold air and to discharge air whose temperature has been increased by the heat from the heating element. difficult.

  Therefore, a portable information terminal device requires a cooling device that can be cooled more efficiently with less vibration.

  According to the first aspect of the present invention, in a portable information terminal device provided with a heating element such as an LCD, an intake crossflow fan and an exhaust crossflow fan are arranged on both sides of the heating element. Information terminal equipment.

  According to a second aspect of the present invention, in the portable information terminal device according to the first aspect, a blade is disposed between the intake and exhaust cross-flow fans.

  According to the present invention, since the intake crossflow fan and the exhaust crossflow fan are arranged on both sides of the heating element, cold air sucked by the intake crossflow fan from the intake port hits the heating element. The heating element is warmed by the heat from the heating element and discharged from the exhaust port by the exhaust crossflow fan, whereby the heating element can be efficiently cooled.

  Further, by arranging a blade between the intake and exhaust cross flow fans, the air flow path is narrowed from the intake cross flow fan to the exhaust cross flow fan, and the flow of air passing therethrough is adjusted. The air can be intensively blown to the heating element, and the heating element can be cooled more efficiently.

  Hereinafter, the best mode for carrying out the present invention will be described. FIG. 1 shows an external structure of a folding-type mobile phone as this embodiment. FIG. 1A shows a closed state, and FIG. 1B shows an opened state. This is merely an example, and the present invention does not matter in the form of a mobile phone.

  A mobile phone 1 according to the present embodiment includes a lower housing 2 and an upper housing 3. The back surface 4 of the upper housing 3 is provided with a sub LCD 5, an intake port 6, and an exhaust port 7. A front surface 8 of the lower housing 2 is provided with a keypad 9 composed of various operation keys and a transmission microphone 10. A main LCD 12 and a receiving speaker 13 are provided on the front surface 11 of the upper housing 3.

  Next, the arrangement in the housing is shown in the internal arrangement diagram of FIG. FIG. 2A is a layout view from the inside of the housing to the upper housing back surface 4 side. Here, two cylindrical crossflow fans for intake and exhaust are provided independently. That is, the intake cross flow fan 16 and the exhaust cross flow fan 17 connected to the fan drive motors 14 and 15 are arranged on both side surfaces in the upper housing 3, and the sub LCD 5 arranged between the cross flow fans. The driver IC / CPU (both not shown) on the printed circuit board (PCB Printed Circuit Board) 18 is cooled.

  FIG. 2B is a layout view from the inside of the housing to the upper housing front surface 5 side. Similarly, an intake crossflow fan 16 and an exhaust crossflow fan 17 are arranged on both side surfaces in the upper housing 3, and driver ICs / CPUs (on the main LCD 12 and the printed circuit board 18 disposed between the crossflow fans ( Both are not shown) and the like are cooled. At this time, the arrows in FIGS. 2A and 2B are cooling air flow paths.

  Next, the operation in this embodiment will be described. This is because the intake crossflow fan 16 driven by the motor 14 sucks air from the intake port 6, and the main LCD 12, sub-LCD 5, and further, a heating element such as a driver IC or CPU provided on the printed circuit board 18. Apply the sucked cold air to cool the heating element.

  At the same time, the exhaust crossflow fan 17 driven by the motor 15 discharges air that has been warmed by cooling the heating element from the exhaust port 7. As a result, air constantly circulates in the housing from the intake port 6 toward the exhaust port 7 while the fan is rotating, so that the heating element can be efficiently cooled.

  Moreover, in FIG. 3 which shows the AA cross section of FIG. 1, the center part cross section of the mobile telephone 1 of this embodiment is shown. As in the above, the arrows in the figure are cooling air flow paths. At this time, since the intake / exhaust cross flow fans 16 and 17 can both discharge the sucked air from the suction direction in a direction perpendicular to the suction direction, air is sucked from the intake and exhaust ports 6 and 7 provided on the back surface 4 of the upper housing 3. The discharge becomes possible. Thereby, in this embodiment, since the mobile phone 1 is a folding type, it is possible to cool the mobile phone 1 even when the mobile phone 1 is closed.

  Furthermore, a high wind speed can be obtained by providing two cross flow fans. This can save space and achieve a high wind speed of cooling air in a mobile phone having a thin and flat shape compared to other cooling fans (axial fans, sirocco fans, etc.). That's it.

  Furthermore, it is possible to consider the advantage that the mobile phone can be designed without impairing the appearance design.

  As another embodiment, as shown in FIG. 4, a printed board 18 in a housing is provided with a plate-like blade 19. This is because when the air sucked by the intake crossflow fan 16 is applied to the heating element, the blade 19 serves as a guide, and by narrowing the flow path, the wind speed in the vicinity of the heating element is increased, and the efficiency is increased. Cools well. The shape and installation location of this blade are not limited, and it is sufficient that the air flow path in the housing can be rectified to the vicinity of the heating element.

  At this time, in the printed circuit board 18 provided with a heating element such as a driver IC or a CPU, in consideration of the arrangement of the heating element, the heating element is arranged as many as possible in the flow path of the air in the housing, and is cooled more efficiently. Is also possible.

  In addition, although the example which applied the portable information terminal device of this invention to the mobile telephone 1 was demonstrated so far, the portable information terminal device of this invention is not limited to application to a mobile phone, PHS, PDA, etc. The present invention can be applied to various types of portable information terminal devices.

BRIEF DESCRIPTION OF THE DRAWINGS The external structure of the mobile telephone of one Embodiment of this invention is shown, (a) is a perspective view of the closed state, (b) is a perspective view of the open state. It is an internal arrangement figure of a cooling device in an upper case of a cellular phone of one embodiment of the present invention. It is AA sectional drawing in FIG. It is an internal arrangement figure of a cooling device in an upper case of a cellular phone of other embodiments of the present invention. It is a perspective view showing the prior art example in patent document 1. FIG.

Explanation of symbols

1 Cellular Phone 2 Lower Housing 3 Upper Housing 4 Upper Housing Back 5 Sub LCD
6 Intake port 7 Exhaust port 8 Lower housing front 9 Keypad 10 Mic for sending 11 Upper housing front 12 Main LCD
13 Speaker for reception 14, 15 Motor 16 Cross flow fan for intake 17 Cross flow fan for exhaust 18 Printed circuit board 19 Blade 20 Vibration motor 21 Electronic component

Claims (2)

In a portable information terminal device including a heating element such as an LCD,
A portable information terminal device, wherein an intake crossflow fan and an exhaust crossflow fan are arranged on both sides of the heating element. 2. The portable information terminal device according to claim 1, wherein a blade is disposed between the intake and exhaust cross flow fans.

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