JPH11143585A - Information processor having heat radiation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evenly disperse heat and also to increase a heat radiation area to effectively attain natural convective radiation by floating a heat pipe above an external case at a part which receives the heat from a heating part and then adhering the heat pipe to the external case directly or via a heat radiation plate at the part excluding the said heat receiving part. SOLUTION: A heat radiation rubber 4 touches the top face of a CPU 3 which is mounted on a circuit board 2. Then a block 7 which holds a heat pipe 6 against a heat radiation plate 5 touches the rubber 4. The plate 5 is caulked to the block 7 holding the pile 6 to surely hold the pipe 6. The pipe 6 has a U-shape while a heat receiving part 6a which is held between the plate 5 and the block 7 is located approximately at the center of the U-shape. The pipe 6 is bent upward at a place near the part 6a and also floated above the inner surface of an external case 1 at the part 6a. Meanwhile, the pipe 6 is adhered to the case 1 at the part including its both ends, but excluding the part 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus such as a portable computer having a built-in heat-generating component such as a CPU and having a heat dissipation structure for heat dissipation.

[0002]

2. Description of the Related Art Conventionally, an information processing apparatus such as a portable computer has a heat-generating component such as a CPU therein, and various heat-radiating devices for preventing heat from affecting other components. It has a structure.

FIG. 3 shows an internal configuration of an information processing apparatus having a conventional heat dissipation structure. In FIG. 3, reference numeral 31 denotes a CPU which is a heat-generating component; 32, a heat radiation rubber provided in close contact with the CPU 31 and a metal heat sink 33; 34, a heat pipe held by a metal heat sink 35;
1 is in contact with the tip. Further, a heat pipe 34 and a heat sink 35 holding the heat pipe 34 are arranged so as to extend to the vicinity of an air-cooled fan motor 37 provided on a side surface of a resin main body case 36.

[0004] The heat generated by the CPU 31 is
The heat is dissipated, and transmitted to the heat sink 35 via the heat pipe 34, and is dissipated from the heat sink 35. These heats are transferred to the air-cooled fan motor 3
7, forcibly released to the outside.

[0005]

However, in an information processing apparatus having such a heat dissipation structure, the area for efficient heat dissipation is limited, and sufficient natural convection heat dissipation cannot be realized. Forced heat radiation by installing a fan motor or the like was necessary.

Further, in such a heat radiation structure, since the portion where the heat pipe and the heat sink are arranged is locally heated, it is necessary to take measures to prevent the external case and its surrounding parts from being adversely affected by heat. was there.

An object of the present invention is to provide an information processing apparatus having a heat radiating structure capable of dispersing heat of a heat-generating component evenly without locally increasing the heat and simultaneously expanding a heat radiating area to efficiently radiate natural convection heat. With the goal.

[0008]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention uses an external case of a main body of an information processing apparatus made of metal and uses it as a heat sink, and uses a heat pipe as a heat receiving part from a heat generating component. It is placed in a floating state, and in other parts, it is placed directly or in close contact with the outer case via a heat sink.

According to the present invention, the heat of the heat-generating component can be evenly dispersed without locally increasing the heat, and at the same time, the heat-dissipating area can be increased, whereby a heat-dissipating structure capable of efficiently performing natural convection heat-dissipation can be obtained.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention is an information processing apparatus in which an outer case is used as a heat sink for radiating heat-generating components. A heat pipe for transmitting heat of a heat-generating component to the outer case, wherein the heat pipe is arranged so as to float from the outer case at a heat receiving portion from the heat-generating component, and radiates heat to the outer case at other portions. It is arranged in close contact with a plate, and has the following action. That is, with this configuration, the outer case can receive the heat from the heat pipe in a dispersed manner, so that the outer case can be heated uniformly. Furthermore, since it is an exterior case, it can directly come into contact with outside air in a wide range, and a large amount of heat inside the information processing device can be radiated. As a result, it is possible to obtain a heat dissipation structure capable of efficiently performing natural convection heat dissipation without requiring forced heat dissipation means such as an air-cooled fan motor.

According to a second aspect of the present invention, in the information processing apparatus having the heat radiating structure according to the first aspect, an upright wall is provided in the outer case, and the L-shaped heat radiating plate is attached or contacted to at least one portion of the heat pipe. Is arranged in close contact with both the bottom surface and the upright wall of the outer case. With this configuration, it is possible to increase the contact area between the outer case and the heat pipe directly and via the heat sink. As a result, it has the effect of increasing the amount of heat radiation from the heat pipe to the outer case.

According to a third aspect of the present invention, in the information processing apparatus having the heat dissipation structure according to the first aspect, at least an exterior surface of the exterior case near the heat-generating component is covered with a thin heat-insulating sheet. It has the following functions. In other words, because it is made of metal, the outer surface of the outer case, which has a large thermal conductivity and feels more intuitively than resin even at the same temperature, is covered with a thin resin sheet. Thus, the outer case can be further heated to increase the temperature difference from the outside air, and the heat radiation efficiency to the outside air can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a plan view showing the internal configuration of an information processing apparatus having a heat dissipation structure according to an embodiment of the present invention, as viewed from the top and from the side. In FIG. 1, reference numeral 1 denotes an outer case on the bottom side of the information processing apparatus main body, which is made of metal.
As a material, a magnesium alloy is preferable because it can be reduced in weight.

The interior of the outer case has the following configuration. That is, the heat radiation rubber 4 is brought into contact with the top surface of the CPU 3, which is a heat-generating component mounted on the built-in circuit board 2, and the heat pipe 6 is sandwiched between the heat radiation rubber 5 and the block 7. And placed in contact. The radiator plate 5 and the block 7 are made of metal, and are preferably made of copper or aluminum. In this embodiment, in order to hold the heat pipe 6 reliably,
The heat radiating plate 5 has a structure in which the heat pipe 6 is sandwiched between the heat radiating plate 5 and the block 7. With this configuration, the heat of the CPU 3 can be efficiently transmitted to the heat pipe 6.

Next, the heat pipe 6 has a U shape as shown in FIG. 1, and the heat receiving portion 6a sandwiched between the heat radiating plate 5 and the block 7 is located substantially in the middle of the U shape. In the vicinity of the heat receiving portion 6a, the heat pipe is bent in the height direction. With this configuration, the heat pipe 6 can be placed in a floating state without contacting the inner surface of the outer case 1 at the heat receiving portion 6a, and can be arranged in a state of being in close contact with the outer case 1 at other portions including both ends. .

In this embodiment, the heat radiating plate 5 is arranged below the heat pipe 6 around the heat receiving portion 6a, but the heat radiating plate 5 is also fixed to the outer case 1 by screwing. Are arranged so that they do not touch each other. As a result, the heat receiving portion 6 of the heat pipe 6 having a relatively high temperature
a, instead of conducting heat to the outer case 1
The heat source is dispersed so that heat can be almost uniformly transmitted to the outer case 1, and not only is the heat radiation from the outer case 1 to the outside air advantageous, but also the heat of the hard disk unit and battery built in the information processing apparatus main body. It is also excellent in that it does not require special heat dissipation measures for weak element parts and can be arranged relatively freely.

Further, in the present embodiment, one end of the heat pipe 6 is fixed so as to be pressed against the outer case 1 by the heat radiating plate 8. The radiator plate 8 has an L-shape, and is fixed to the outer case 1 by screws so as to be in close contact with both the bottom surface and the upright wall of the outer case 1. At the other end of the heat pipe 6, an L-shaped heat sink 9 is attached by caulking.
Also, the outer case 1 is similarly screwed and fixed to the outer case 1 so as to be in close contact with both the bottom surface and the upright wall. With this configuration, the contact area between the outer case 1 and the heat pipe 6 can be increased directly and via the heat radiating plate, so that heat can be transferred to the outer case 1 more efficiently.

As a result, the heat of the heat-generating component can be transmitted from the heat pipe to the outer case and further to the outside air under optimum conditions, and efficient natural heat can be obtained without using forced radiation means such as an air-cooled fan motor. Convection heat dissipation can be realized. Since the air-cooled fan motor is not built in, a quiet and high-quality information processing apparatus without noise and vibration caused by the air-cooled fan motor can be provided. Further, not using an air-cooled fan motor that is vulnerable to impact and eliminating the need to make a ventilation hole in the outer case are advantageous in terms of impact resistance, dust resistance, and waterproof design required for a field information processing device.

(Embodiment 2) In the embodiment as shown in FIG. 2, a thin resin sheet 10 is provided so as to cover all surfaces of the exterior bottom surface 1a of the exterior case 1 where the heat pipes 6 are arranged. With double-sided tape.
The sheet 10 is preferably a PV having good heat resistance and flame retardancy.
Uses C or polycarbonate to cover the metal surface, which has a high thermal conductivity and is easy to feel sensually hot compared to resin, without reducing the heat dissipation efficiency to the outside air even if it is thin. 0.3mm to 0.5m
m is preferable. With this configuration, the amount of heat transferred to the outer case 1 can be further increased and the temperature difference with the outside air can be increased, as compared with a case where the outer bottom surface 1a of the outer case is not covered with the sheet 10, and the temperature from the outer case 1 to the outside air can be increased. Heat radiation efficiency can be further improved. Also,
By covering the exterior surface of the magnesium alloy of the exterior case 1, appearance defects such as hot water wrinkles at the time of molding can be hidden, so that the secondary processing such as putty coating and painting of the molded product of the magnesium alloy can be performed. It can reduce or increase the yield of molded products. Further, the notation content and color of the sheet 10 can be easily changed, which is advantageous in terms of design.

[0020]

As described above, according to the present invention, the heat of the heat-generating components can be distributed evenly without locally increasing the heat, and at the same time, the heat-radiating area can be increased, so that the natural convection heat can be efficiently radiated. The structure can be obtained, and the following advantageous effects can be obtained.

That is, in the present invention, since there is no locally hot part inside the information processing apparatus, it is not necessary to take a special heat radiation measure for heat-sensitive element parts such as a built-in hard disk unit and a battery, and it is relatively free. Can be arranged. In addition, since efficient natural convection heat radiation can be performed, it is not necessary to mount an air-cooled fan motor, so that it is possible to provide a quiet and high-quality information processing device without generating noise or vibration.
Furthermore, the elimination of air-cooled fan motors that are vulnerable to shocks, and the elimination of ventilation holes in the outer case, have the impact-resistant, dust-proof,
This is also advantageous in terms of waterproof design.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an internal configuration of an information processing apparatus having a heat dissipation structure according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which an exterior surface of an information processing apparatus having a heat dissipation structure according to an embodiment of the present invention is covered with a resin sheet;

FIG. 3 is a configuration diagram showing an internal configuration of an information processing apparatus having a conventional heat dissipation structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 outer case 1a outer bottom surface of outer case 3 CPU 5, 8, 9 heat sink 6 heat pipe 6a heat receiving portion of heat pipe 10 sheet

Claims (3)

[Claims] 1. An information processing apparatus, wherein an outer case is used as a heat sink for heat radiation of a heat-generating component, wherein the heat pipe contacts an inner surface of the outer case and the heat-generating component to transfer heat of the heat-generating component to the outer case. Wherein the heat pipe is floated from the outer case in the heat receiving part from the heat generating component, and is arranged in the other part by closely contacting the outer case directly or via a heat radiating plate. An information processing device having a heat dissipation structure. 2. An exterior case is provided with an upright wall, and an L-shaped heat sink attached or contacted to at least one location of the heat pipe is disposed in close contact with both the bottom surface and the upright wall of the exterior case. An information processing apparatus having the heat dissipation structure according to claim 1. 3. The information processing apparatus having a heat dissipation structure according to claim 1, wherein at least an exterior surface of the exterior case near the heat-generating component is covered with a thin resin sheet.