JP2002013853A - Cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler which can keep the temperature of a burn preventive net low thereby preventing a burn even if a heat radiative fin heats, since the heat radiative fin is covered with the burn preventive net consisting of material low in heat conductivity such as stainless or the like. SOLUTION: The ultrasonic oscillation circuit of an ultrasonic facial apparatus 1 is equipped with a power transistor 9 as a heating element. A cooler 10 for cooling this power transistor 9 is equipped with a heat radiative fin 11 in contact with a power transistor 9 and a burn preventive net 12 consisting of material low in heat conductivity, covering this heat radiative fin 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device, and more particularly, to a cooling device capable of preventing a burn.

[0002]

2. Description of the Related Art Conventionally, for example, in an ultrasonic cosmetic device for obtaining a cosmetic effect by applying ultrasonic waves to the skin, a power transistor is used in an ultrasonic generating circuit for generating ultrasonic waves. Since the power transistor generates a considerable amount of heat, a radiating fin is provided for cooling the power transistor.

[0003]

When the case of the ultrasonic cosmetic device is large, a sufficient cooling effect can be obtained by accommodating the radiating fin in the case and providing a fan. However, when the ultrasonic cosmetic device is hand-operated as a hand-held type, the size of the case becomes considerably small, so that it is difficult to provide a fan, and a sufficient cooling effect of the radiation fins cannot be obtained. In such a case, it is desirable to provide a window in the case so that the cooling fin faces the window. However, in such a configuration, the cooling fin becomes extremely hot, and thus, there is a risk of burns. The present invention has been made in view of such circumstances, and provides a cooling device free from a risk of burns.

[0004]

That is, a cooling device according to the present invention comprises a radiating fin in contact with a heating element, and a burn prevention net covering the heat release fin, wherein the burn prevention net is made of a material having a low thermal conductivity. Characterized by being manufactured from The burn prevention net can be made of, for example, stainless steel.

According to the above construction, the heat radiation fins are covered with the burn prevention net. Since the burn prevention net is made of a material having a low thermal conductivity such as stainless steel, the cooling fins become extremely hot. Also, the burn prevention net can be prevented from becoming hot enough to cause a burn to a person. Further, since the burn prevention net is a net, air can flow over the burn prevention net, thereby preventing cooling of the radiation fins from being hindered.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIGS. 1 and 2, a hand-held type ultrasonic cosmetic device 1 has a generally cylindrical case 2 as a whole. A cylindrical ultrasonic probe 3 is provided at one end of the case 2, and the other end of the case 2 is
It has become. The grip portion 2A is reduced in diameter in the vicinity of the probe 3 and in the opposite end, whereby the user grips the grip portion 2A of the case 2 to bring the surface of the probe 3 into contact with the skin of the face. In this case, the shape is easy to use. An ultrasonic generating circuit (not shown) is provided in the case 2. The ultrasonic generating circuit is connected to a commercial power supply via a power cord 4 which is detachably connected to an end of the grip 2 </ b> A opposite to the probe 3. It is designed to be connected to a power supply. An ON / OFF switch 5 of the ultrasonic wave generating circuit is provided on the front side of the gripper 2A.
A red LED 6 for displaying an OFF state, and an UP button 7A and a DO for adjusting the intensity of the ultrasonic wave in three stages.
A WN button 7B is provided, and the strength of the ultrasonic wave can be displayed by the number of lighting of the three green LEDs 8.

As shown in FIG. 3, the ultrasonic generating circuit housed in the case 2 has a power transistor 9 as a heating element, and cools the power transistor 9 in the case 2. Cooling device 10 is provided. Since the above-mentioned ultrasonic wave generating circuit has been already known, its detailed description is omitted. The cooling device 10
The radiating fin 11 includes a heat radiating fin 11 integrally connected to the power transistor 9 and a burn prevention net 12 covering the heat radiating fin 11. The radiation fins 11 are made of a material having good thermal conductivity, for example, aluminum, and have a base 11A formed in a square shape.
1A and a plurality of fins 11B integrally formed therewith. The fins 11B are formed in a plate shape and arranged on the base 11A in parallel with each other. On the other hand, the burn prevention net 12 is made of a material having a low thermal conductivity, for example, a stainless steel material, and has a wire mesh made of a stainless steel wire having a mesh roughness of about 1 mm × 1 mm. Then, the wire mesh material is formed in a box shape with one surface opened, and the box-shaped burn prevention net 12 is put on the plurality of fins 11B.

The cooling device 10 is accommodated in a box-shaped accommodating portion 13 formed on the inner surface of the case 2 and protruding toward the inside of the case 2. The housing portion 13 has an opening 13A formed on each wall surface protruding into the case 2, and the base 1 of the heat radiation fin 11 is formed on a wall surface serving as a bottom wall 13B thereof.
1A is mounted and fixed, and the power transistor 9 is brought into close contact with the base 11A via the opening 13A. The side opposite to the bottom wall 13B of the housing portion 13 is a cooling hole 13C opened to the surface of the case 2, and the burn prevention net 12 is substantially flush with the surface of the case 2 from the cooling hole 13C. In the way outside.

In the above configuration, when the ON / OFF switch 5 is turned on, the red LED 6 is lit to indicate the state, but no ultrasonic wave is generated at this stage.
In this state, if the user operates the UP button 7A and the DOWN button 7B to select the intensity of the ultrasonic wave while observing the lighting number of the green LED 8, an ultrasonic wave corresponding to the intensity is generated. In this way, when the ultrasonic generator circuit (not shown) of the ultrasonic cosmetic device 1 is energized to generate ultrasonic waves, the power transistor 9 starts to generate heat. Then, the heat of the power transistor 9 is conducted to the radiating fins 11 that are in close contact with the power transistor 9 and radiated into the air from the fins 11B of the radiating fins 11. At this time, when the temperature of the fins 11B is 45 ° C. or higher, the user feels hot, and when the temperature exceeds 60 ° C., there is a risk of burns. However, the fin 11B is covered with the burn prevention net 12, and since the burn prevention net 12 is made of stainless steel having a low thermal conductivity, the temperature of the surface of the burn prevention net 12 is made to be higher than the temperature of the fin 11B. It can be kept low. Moreover, since the burn prevention net 12 is configured as a net, its heat capacity can be reduced, and the surface temperature of the burn prevention net 12 can be further reduced. Therefore, the user does not feel much heat. Further, since the burn prevention net 12 is used, air can pass through the burn prevention net 12, thereby ensuring a sufficient cooling effect of the heat radiation fins 11. According to the experiment, the temperature of the fin 11B is 60 ° C.
At this time, the temperature of the burn prevention net 12 could be set to about 45 ° C.

In the above embodiment, the power transistor used in the ultrasonic wave generating circuit is cooled.
The present invention is not limited to this. For those in which a heat radiating fin is brought into contact with a heating element to cool it,
It is clear that the invention can be applied.

[0011]

As described above, according to the present invention, the radiating fins in contact with the heating element are covered with the burn prevention net made of a material having low thermal conductivity. We can keep temperature of burn prevention net low,
This can prevent burns. Further, since the air can pass through the burn prevention net, the effect of not disturbing the heat radiation effect of the heat radiation fins can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a rear view of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ultrasonic beauty device 2 Case 2A Gripping part 3 Probe 9 Power transistor 10 Cooling device 11 Radiation fin 12 Burn prevention net

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H01L 23/36 H01L 23/36 Z

Claims (3)

[Claims] 1. A cooling device comprising: a heat radiating fin in contact with a heating element; and a burn prevention net covering the heat release fin, wherein the burn prevention net is made of a material having low thermal conductivity. 2. The cooling device according to claim 1, wherein the heating element and the radiation fin are provided in a case, and the burn prevention net faces outside from a cooling hole formed in the case. 3. The cooling device according to claim 1, wherein the heating element is a power transistor, and the burn prevention net is made of stainless steel.