JPH08102591A - Electronic apparatus - Google Patents

Abstract

PURPOSE: To automatically open and close a ventilation port for thermal exchange with change of temperature within an electronic device. CONSTITUTION: When a display 6 and a heat source module 7 within a cabinet receive the supply of electrical power to generate heat resulting in temperature rise, a restoring force is generated within a shape memory alloy to push down the ventilation port cover 3 to open the ventilation port 2 in order to compress an elastic body 5. When internal temperature drops and the restoring force of the shape memory alloy is lowered, the ventilation port cover 3 is restored with the resorting force of the compressed elastic body 5 to close the ventilation port 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for opening and closing a ventilation opening cover for heat radiation provided in a housing of electronic equipment.

[0002]

2. Description of the Related Art While an electronic device is in use, heat is internally generated and the temperature rises, which affects the operation of an electronic circuit. Generally, electronic devices are provided with a ventilation port for heat dissipation, and an internal air is exhausted by an electric fan, and external air is taken in to lower the internal temperature. Providing the ventilation port in this way is an effective means for lowering the temperature inside the electronic device, but when it is not necessary to lower the temperature, dust enters the inside of the electronic device or the sound of the electric fan is emitted outside. It also has the disadvantage of leaking. Here, if the ventilation port is opened when the internal temperature rises, the above problem is solved. For example, Japanese Patent Application No. 3-296154 and the like are known as a technique in which a ventilation hole for heat dissipation is provided in a housing of an electronic device and the ventilation hole is opened / closed in association with a rise in internal temperature. This document describes a method in which the temperature detecting means detects that the temperature inside the electronic device housing has reached a predetermined value, and based on the detection result, the ventilation opening is adjusted by means for opening and closing the ventilation opening. . Further, there is disclosed a device in which a temperature sensor is used as the temperature detecting means, a slide-type opening / closing member is used as the ventilation opening / closing means, and a motor is used as a power source for sliding the same. Japanese Patent Application Sho 58-191
In 897, a shape memory alloy is provided between one end of the sliding type opening / closing member and the inner side surface of the housing, and the restoring force generated in the shape memory alloy when the temperature inside the housing becomes constant is utilized. The method of sliding is described.

[0003]

However, when a temperature sensor or an electric motor is used as the means for opening and closing the ventilation port as illustrated, it is necessary to provide a control circuit, a device for power supply, etc. There are problems that the housing of the electronic device becomes large and power consumption increases. Further, in the method of opening and closing the ventilation port by the method using the shape memory alloy, after the shape of the shape memory alloy is restored, an operation for returning to the state before the restoration is required.

[0004]

In order to achieve the above object, the present invention provides an electronic device in which a ventilation hole for heat dissipation is formed in a housing of an electronic device body, and the ventilation hole is openable and closable in the ventilation port. A palate is provided, and a spring made of a shape memory alloy is provided between both ends of the ventilation palate and the electronic device body, and an elastic body that generates a restoring force in a direction opposite to the extending and contracting direction.

[0005]

The electronic device body according to the present invention is formed with a vent for heat dissipation and a vent cover that can be opened and closed. When the temperature inside the electronic device rises and reaches a certain temperature, both ends of the vent cover are closed. A restoring force is generated in the spring made of shape memory alloy provided between the electronic device body and the ventilation lid is expanded,
Heat can be exchanged, and the temperature inside the housing drops.

At this time, the elastic body provided at the position where the ventilation port lid is paired is compressed by expanding the ventilation port lid. Subsequently, when the temperature inside the housing decreases and the restoring force of the shape memory alloy decreases, the elastic body contracted by the displacement when the ventilation lid is expanded restores its original position even when the displacement energy is released. While pushing back the ventilation palate,
A spring made of shape memory alloy is contracted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing a structure of an electronic device showing an embodiment of the present invention. This device includes a housing 1, a ventilation opening 2 provided on a side surface of the housing, a ventilation opening lid 3, a shape memory alloy 4, an elastic body 5, an image display device 6, and a heat source including an electronic circuit and a power supply circuit. It is an electronic device integrated with a display device including a module 7 and.

First, the structure of the ventilation port 2 and the ventilation port lid 3 of this apparatus will be described. The ventilating port 2 is provided on the side surface of the casing 1 for discharging heat generated inside, and is closed by the ventilating port 3 when the internal temperature of the casing 1 is room temperature.

The ventilation port lid 3 of this embodiment is formed so as to be slidable up and down. For example, sliding guide rails or the like are used on both sides of the ventilation cover 3 so as to be movable in a certain direction. A shape memory alloy 4 and an elastic body 5 are provided between both sides of the ventilation port 3 and the inner side surface of the housing 1. In this embodiment, the shape memory alloy 4 and the elastic body 5 support the ventilation port cover 3 at a position where the ventilation port 2 is completely covered. At this time, the restoring force of the elastic body 5 is adjusted so as to be supported at a predetermined position even if the gravitational acceleration of the ventilation lid 3 is applied.

Next, the case where the temperature inside the housing 1 rises will be described with reference to FIG. When the display device 6 and the heat source module 7 are in the operating state, heat is generated by energization, and the temperature inside the housing 1 rises. When a certain temperature is reached, a restoring force is generated inside the shape memory alloy 4 and the shape remembered is restored. At this time, a downward force is applied to the ventilation lid 3,
Since the ventilation port cover 3 has a slidable structure, it moves downward to open a part of the ventilation port 2. With the movement of the ventilation port 3, the elastic body 5 is compressed and a restoring force is generated.
Since the restoring force of the shape memory alloy 4 is adjusted to be stronger, the state in which a part of the ventilation port 2 is opened is maintained as it is.

Next, a case where the temperature inside the housing 1 drops will be described with reference to FIG. When the temperature inside the housing 1 decreases, the restoring force of the shape memory alloy 4 is gradually lost, but the restored shape is retained as it is. When the temperature further decreases, the restoring force of the shape memory alloy 4 becomes smaller than the restoring force of the elastic body 5 that is compressed when the temperature inside the housing 1 is high.

At this time, the elastic body 5 starts pushing up the ventilation lid 3, and at the same time, the shape memory alloy 4 is pushed back.
Since the elastic body 5 is adjusted so that the ventilation port cover 3 balances with the position where the ventilation port 2 is completely closed, the elastic body 5 pushes up the ventilation port cover 3 to a predetermined position and stops.

The shape memory alloy 4 of FIG. 1 according to the present embodiment can be realized by using a structure such as a spiral spring, a spring formed by folding a ribbon-shaped plate, or a spiral spring.

The elastic body 5 shown in FIG. 1 according to the present embodiment is made of metal, synthetic resin, or the like, and has a structure such as a spiral spring, a spring formed by folding a ribbon-shaped plate, or a spiral spring. Can be achieved with.

In this embodiment, the ventilation port lid 3 is formed so as to be slidable up and down as shown in FIG. 1, but it may be formed so as to be slidable laterally. In this case, it is not necessary to adjust the relationship between the restoring force of the elastic body and the gravity of the ventilation palate.

The structure of the ventilation port and the ventilation port lid may be different from that of the first embodiment. FIG. 4 shows an embodiment in which one end of the ventilation cover 3 is rotatably attached at a support point 9. The shape memory alloy 4 and the elastic body 5 are provided between the ventilation port plate 3 and the support member 8. The support material 8 is fixed to the housing 1. Here, when the temperature inside the electronic device housing 1 rises, a restoring force is generated in the shape memory alloy 4 to restore the stored shape (in this case, the shape is shortened). At this time, the ventilation palate 3 is the support member 8
Although it is attracted to the side, the support point 9 is rotated as a fulcrum to open the ventilation port 2. At the same time, the elastic body 5 is also compressed. When the temperature inside the housing 1 decreases, the restoring force of the shape memory alloy 4 becomes small, and the restoring force of the elastic body 5 pushes the ventilation port lid 3 back to close the ventilation port 2.

FIG. 5 shows an embodiment in which the ventilation port lid 3 is formed so as to be rotatable. In this embodiment, the ventilation port lid 11 is attached to the housing 1 so as to be displaceable at the support points 10. A second ventilation port 12 is provided inside the ventilation port lid 11 in addition to the ventilation port provided in the housing 1. The shape memory alloy 4 and the elastic body 5 are fixed to the inside of the housing 1 and the ventilation port lid 11 via the attachment parts 9. The second ventilation port 12 provided in the ventilation port lid 11 is in a position that does not overlap with the ventilation port provided in the housing when the temperature inside the housing 1 is room temperature.

Here, when the temperature inside the casing 1 rises, the shape memorized in the shape memory alloy 4 is restored, the mounting member 9 is pushed back, and the ventilation cover 11 rotates around the support point 10 to rotate the casing 1. The ventilation port provided on the second ventilation port 12 and the second ventilation port 12 overlap with each other, and heat exchange between the inside and the outside of the housing 1 becomes possible. The elastic body 5 is stretched by this rotation. Next, when the temperature inside the housing 1 decreases, the restoring force of the shape memory alloy 4 weakens, and the elastic body 5
When the elastic body 5 begins to contract due to the restoring force of, the attachment part 9 is drawn and the ventilation port 11 rotates in the opposite direction,
The ventilation opening of the housing 1 and the second ventilation opening 12 do not overlap,
The ventilation port of the housing 1 is closed.

Although the electronic device integrated with the display device has been described as an embodiment, the present invention can be applied to any electronic device in which the temperature inside the housing rises due to energization.

[0020]

As described above, the electronic device according to the present invention opens and closes the ventilation port in accordance with the change in the temperature inside the housing, so that the ventilation port is not opened more than necessary and dust enters and internal Noise leakage can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an electronic device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example when the temperature inside the housing rises.

FIG. 3 is a cross-sectional view showing an example when the temperature inside the housing is lowered.

FIG. 4 is a sectional view of an electronic device showing a second embodiment of the present invention.

FIG. 5 is a sectional view of an electronic device showing a third embodiment of the present invention.

[Explanation of symbols]

1 Electronic Device Housing 2 Vent Vent 3 Vent Vent 4 Shape Memory Alloy 5 Elastic Body 6 Display Device 7 Heat Source Module 8 Support Part Goods 9 Mounting Part Goods 10 Support Points 11 Ventilate End 12 Second Vent

Claims (1)

[Claims] 1. An electronic device in which a ventilation hole for heat dissipation is formed in a casing of the electronic device body, wherein an openable and closable ventilation cover is provided at the ventilation port, and between one end of the ventilation port cover and the electronic device body. An electronic device, comprising: a spring made of a shape memory alloy; and an elastic body at a position that is paired with one end of the ventilation port cover.