WO2012050291A1

WO2012050291A1 - Heat-dissipating device for tv set-top box

Info

Publication number: WO2012050291A1
Application number: PCT/KR2011/004375
Authority: WO
Inventors: 남동진; 정인수
Original assignee: 주식회사 에이치앤에스솔루션
Priority date: 2010-10-13
Filing date: 2011-06-15
Publication date: 2012-04-19
Also published as: KR101261443B1; KR20120038257A

Abstract

The present invention relates to a heat-dissipating device for a TV set-top box. The heat-dissipating device for a TV set-top box of the present invention is coupled to a middle lid that is placed between a bottom case on which a substrate is received and a top lid for covering the top surface of the bottom case, and comprises a heat sink having a first contact surface for contacting an exothermic element mounted on the substrate, a second contact surface for contacting the middle lid, and a conductive plate connectingly formed between the first contact surface and the second contact surface, wherein the heat sink is characterized by having formed therein a heat conductive portion on each of the first contact surface and the second contact surface. By using the heat-dissipating device for a TV set-top box of the present invention, heat generation inside a TV set-top box can occur smoothly without equipping the TV set-top box with a fan, which not only enables the TV set-top box to become smaller and lighter, but also reduces noise, and because smooth heat generation is possible even with a heat sink having a simple configuration, the manufacturing cost of the heat sink is reduced, and the durability of the TV set-top box is enhanced as well.

Description

Heat Sink of TV Set Top Box

The present invention relates to a heat dissipation device of a TV set-top box, and more particularly, to a heat dissipation device of a TV set-top box which is capable of dissipating heat efficiently by smoothly transferring heat from a heating element to an intermediate cover in contact with the outside air. .

The heat sink is mounted on the TV set-top box that decodes the received image and supplies the TV to the TV set top box, thereby preventing malfunction of the product due to heat generation. Heat sinks, such as heat sinks, use metals with high thermal conductivity, allowing the heat generated by the product to be released quickly. In particular, a heat sink having a plurality of heat dissipation fins is provided in the heat generating element so as to increase the effective contact area with air so that heat can be discharged quickly.

However, the manufacturing process for extrusion molding a heat sink in which a plurality of heat sink fins are arranged is difficult, and in order to manufacture heat sinks having various shapes, a separate mold corresponding to the heat sink must be provided. there was.

In addition, in the case of a TV set-top box which does not have a fan forcibly blowing outside air in the product, even if a heat sink having a large heat dissipation area is provided since the heat transferred to the heat sink is transferred to the outside air after contact with the air in the product. In the process of dissipating heat to the outside of the product there was a problem that the heat is still stored inside the product.

Therefore, in order to solve the above problems, there is a need for a new heat dissipation device capable of improving the heat dissipation structure of the TV set-top box and increasing its efficiency.

The problem to be solved by the present invention is to provide a heat dissipation device of a TV set-top box that can smoothly transfer the heat of the heat generating element to the intermediate cover in contact with the outside air to efficiently discharge the heat of the heat generating element to the outside.

In order to achieve the above object,

It is coupled between the lower case on which the substrate is seated and the upper cover covering the upper surface of the lower case is coupled to the intermediate cover in contact with the outside air,

A heat sink having a first contact surface in contact with a heating element mounted on the substrate, a second contact surface in contact with the intermediate cover, and a conductive plate connected between the first contact surface and the second contact surface,

It provides a heat dissipation device of the TV set-top box, characterized in that the heat conducting portion is formed on each of the first contact surface and the second contact surface of the heat sink.

According to an embodiment of the present invention, it is preferable that the heat dissipation device of the TV set top box further includes a heat dissipation unit provided on the upper surface of the intermediate cover.

In addition, the thermally conductive portion is preferably an elastomer pad.

Here, the elastomer pad is preferably formed by mixing hexamethylene diisocyanate, methylene diphenyl isocyanate, isophorone diisocyanate and dibutyl tin dilaurate in the synthesized polyol.

In addition, the elastomer pad preferably further comprises an alumina powder and aluminum hydroxide.

In addition, the heat radiating portion is preferably formed by applying a heat radiating agent.

Moreover, it is preferable that the said heat radiating agent is an organic siloxane type heat radiating composition.

According to the present invention, since the heat sink having improved thermal conductivity is directly connected to the intermediate cover in contact with the outside air, the heat dissipation performance is improved, which not only simplifies the shape of the heat sink but also has a heat dissipation effect on the upper surface of the intermediate cover. By applying a heat dissipating agent, the radiant speed of heat transferred to the middle cover is improved, so that the temperature of the TV set-top box is lowered even if the fan is not forced to flow to the TV set-top box, thereby reducing the noise generated by the TV set-top box. At the same time, it is possible to reduce the size and weight of the TV set-top box.

1 is a cross-sectional view showing the heat circulation of the heat generating device of the TV set-top box according to an embodiment of the present invention.

2 is a cross-sectional view showing a temperature measurement position of the heating device of the TV set-top box according to an embodiment of the present invention.

3 is a cross-sectional view of a heating device of a typical TV set top box.

The heat dissipation device of the TV set-top box according to the present invention is positioned between the lower case 110 on which the substrate is seated and the upper cover 120 covering the upper surface of the lower case 110 to contact the outside air 130. Coupled to)),

A first contact surface 141a in contact with the heating element 1 mounted on the substrate, a second contact surface 141b in contact with the intermediate cover, and a connection between the first contact surface 141a and the second contact surface 141b It includes a heat sink 140 is provided with a conductive plate (141c),

Thermal

conductive parts

142a and 142b are formed on the first contact surface 141a and the second contact surface 141b of the heat sink 140, respectively.

Unlike the heat dissipation device of the TV set-top box in general, the heat dissipation device of the TV set-top box according to the present invention, as shown in Figure 1, is directly coupled to the intermediate cover 130 in contact with the outside air introduced into the communication hole 122 And a heat sink 140. Therefore, the heat supplied from the heat generating element 1 passes through the conducting plate 141c at a high speed by the heat conducting portion 142a attached to the first contact surface 141a of the heat sink 140 and the second contact surface 141b. It moves to, and is rapidly moved to the intermediate cover 130 by the heat conducting portion 142b mounted on the second contact surface (141b). Therefore, the heat dissipation device of the TV set-top box according to the present invention, since the heat of the heat generating element 1 is directly conducted to the middle cover by the heat sink 140, the structure of the heat sink 140 compared with the conventional heat dissipation device It can be manufactured simply. Therefore, the processing cost for manufacturing the mold of the heat sink 140 is reduced.

Hereinafter, the present invention will be described in more detail with reference to preferred examples. However, these examples are intended to illustrate the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited thereby.

In general, the set-top box has a function as an Internet user interface medium for connecting to a general TV and using the Internet according to its purpose, and for use in receiving a digital broadcast from a general TV. Types are classified.

Here, the heat dissipation device of the TV set top box may further include a heat dissipation unit 132 provided on the upper surface of the intermediate cover 130. The heat dissipating unit 132 may apply a heat dissipating agent, which is an organic siloxane heat dissipating composition, to the heat dissipating unit 132 so that heat transmitted from the heat sink 140 may be more effectively radiated. The heat dissipation part 132 uses a property that heat is radiated, unlike the

heat conduction parts

142a and 142b. Unlike the convection or heat conduction, heat transfer by radiation allows heat to be transferred from the high temperature body to the low temperature body instantaneously at the same speed as the light without a material that mediates heat around. Therefore, the heat transferred to the intermediate cover 130 at a high speed by the heat sink 140 allows the heat to be radiated to the outside through the heat dissipation unit 132 instantaneously. In addition, since heat is emitted by radiation, heat radiated through the intermediate cover 130 is immediately released to the outside without using the upper cover 120 as a medium so that the temperature of the upper cover 120 is radiated by the radiated heat. Heating can also be minimized. Therefore, it is possible to minimize the heat of the heat generating element 1 in the TV set-top box.

The organosiloxane-based heat dissipating composition used as the heat dissipating agent may include a binder resin and a filler. Wherein the heat dissipating agent, the binder resin of the siloxane-based heat dissipating resin composition is based on 100 parts by weight of the total solid content of the binder resin (a) 5 to 75 parts by weight of the aqueous colloidal silica or alcohol colloid in the range of 1.5 to 10 Silica; (b) 0.1 to 50 parts by weight of an organosilane represented by the following formula (1), a hydrolyzate thereof or a partial condensate thereof; And (c) 10 to 60 parts by weight of an organosilane represented by the following formula (2), a hydrolyzate thereof or a partial condensate thereof,

The filler includes (d) 1 to 300 parts by weight of a thermally conductive metal or carbon compound based on 100 parts by weight of the total solids of the binder resin; (e) 0.1 to 10 parts by weight of the metal alkoxide, metal salt, metal complex compound, hydrolyzate thereof or partial condensate thereof represented by the following formula (3); (f) preferably 10 to 50 parts by weight of C _1-12 ketone or diketone.

R ¹ _a Si (OR ² ) _4-a ----- (1)

R ³ _b Si (OR ⁴ ) _4-b ----- (2)

R⁵M (OR⁶)_3-cOr R⁵ _cM (OR⁷)_3-c-----(3)

Where

R ¹ and R ² are each independently selected from a C _1-6 alkyl group, alkenyl group, halogenated alkyl group, allyl group and aromatic group,

R ³ and R ⁴ are each independently C _1-6 substituted or unsubstituted with a substituent selected from a vinyl group, a phenyl group, a halogen group, a nitro group, a nitrile group, an amino group, an acryl group, an epoxy group, a mercapto group and an amide group An alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, a halogenated alkyl group, an aryl group, an aromatic group,

R ⁵ is selected from C _1-6 alkyl group, alkenyl group, halogenated alkyl group and allyl group, R ⁶ and R ⁷ are each independently C _1-6 alkyl group, M is selected from metal atoms,

a is an integer of 0 to 3, b is an integer of 1 to 3, c is an integer of 0 to 3.

In addition, the heat dissipating agent may be the epoxy resin of the binder resin of the siloxane-based heat dissipating resin composition. In the heat dissipation unit 132 formed by applying the heat dissipant as described above, a number of open pores having a diameter of less than a micron unit are formed. When pores are formed in this way, the passage of gas such as moisture, air, and idealized carbon is facilitated through the pores, and the contact area is increased to maximize the effect of heat radiation.

The heat dissipating unit 132 may be provided with a heat dissipating unit by attaching a tape with a heat dissipating agent to an upper surface of the intermediate cover 130 in addition to the method of forming the heat dissipating agent directly on the middle cover 130. That is, as long as the thermal radiation performance of the intermediate cover 130 can be improved, the heat dissipation unit 132 may be formed on the upper surface of the intermediate cover 130 regardless of its shape, material, and molding method.

In addition, the thermally

conductive portions

142a and 142b may be elastomer pads having good thermal conductivity and adhesion. The elastomeric pads may be hexamethylene diisocyanate, methylene diphenyl isocyanate, isophorone diisocyanate and dibutyl tin di in the synthesized polyol. It is preferable that it is made by mixing laurate. Here, the elastomer pad may further include an alumina powder and aluminum hydroxide, thereby maximizing thermal conductivity. A detailed description of the manufacturing method of the elastomer pad will be described later.

Silicon pads may be mounted on the heat

conductive parts

142a and 142b as well as the elastomer pads on the first contact surface 141a and the second contact surface 141b of the heat sink 140. That is, if the heat conductivity of the heat sink 140 can be increased, the heat sink 140 may be formed on the first contact surface 141a and the second contact surface 141b of the heat sink 140 regardless of the shape, material, and molding method. .

2 is a cross-sectional view showing a temperature measurement position of the heating device of the TV set-top box according to an embodiment of the present invention, Figure 3b is a cross-sectional view of the heating device of the TV set-top box according to a comparative example.

Experimental Example

The TV set top box according to the present invention is 285 × 225 × 32mm, and the CPU is selected as the heating element. The distance from the heating element to the lower case is 5mm, and the distance from the heating element to the upper cover is 35mm. The middle cover uses an aluminum 50 series plate of 280 × 220 × 1mm. The experiment was performed by driving the TV set-top box for 2 hours without inflow of outside air at 25 ° C., and then generating heat corresponding to positions A, B, and C of FIG. 2 and A, B, and C 'of FIG. 3B, respectively. The temperature of the element 1, the lower case 110 at the position closest to the heat generating element 1, and the upper cover 120 at the position closest to the heat generating element was measured.

-Synthesis of polyols

Into a 1000 ml four-necked flask equipped with a cooling condenser, 320 g of adipic acid, 250 g of 1,4-butanediol, and 15 g of ethylene glycol were added thereto, and a temperature was slowly increased while stirring the mantle heater by stirring the stirring rod and the stirrer. Condensation polymerization was carried out at 150-160 ° C. for 8 hours to proceed with esterification, and the condensed water generated at this time was separated from the flask through a condenser. When the production rate of the condensed water started to slow down, a small amount of the sample was removed to measure the acid value, and when the acid value was 80 or less, the temperature was raised to 210 ° C and the reaction was further performed for 5 hours while measuring the acid value every hour. The color of the synthesized polyol was the same as Gardner colori swatch 2, and the acid value was 43.

Preparation of Elastomeric Pads

To 300 g of the polyol synthesized above, 35 g of hexamethylene diisocyanate, 15 g of methylene diphenyl isocyanate, 5 g of isophorone diisocyanate and 2 g of dibutyl tin dilaurate were added and mixed. Here, as a filler to help heat transfer, an average particle diameter of 10 μm alumina powder 200 g, an average particle diameter of 5 μm alumina powder 150 g, an average particle diameter of 2 μm alumina powder 100 g, and aluminum hydroxide 600 g were added and stirred for 1 hour. The elastomer slurry obtained by stirring was coated on a PET film as a release paper to 2 mm thickness, and then cured at 120 ° C. for 15 minutes to prepare an elastomer pad.

-Manufacture of heat radiators

In order to prepare the binder resin used for the siloxane-based heat dissipating resin composition, 250 g of 3-methacryloxypropyl tris (trimethylsiloxy) silane, 100 g of tetraethoxysilane and 146 g of methanol were put into a flask and stirred. 7.3 g of titanium isopropoxide was added to the mixture, which was then stirred again until a clear solution was obtained. 80 g of aqueous hydrochloric acid solution of pH 2.5 was added dropwise while the stirred mixture was cooled to 25 ° C., and then reacted for several hours. Then, 200 g of colloidal silica was added and aged for several hours to prepare a binder resin.

300 g of alumina powder having a size of 2 to 5 μm, 200 g of zinc oxide having a size of 1 to 2 μm, 100 g of boron nitride having a size of 1 to 2 μm, and 50 g of aluminum nitride having a size of 1 to 2 μm as a filler to the binder resin, 4 to 7 μm 10 g of sized graphite was added and rapidly dispersed, and aged for 24 hours.

Example 1

As shown in FIG. 2A, heat

conductive parts

142a and 142b are provided on the first contact surface 141a and the second contact surface 141b of the heat sink 140 made of the same material as the intermediate cover. The heat sink has a thickness of 1 mm, and the conductive plate 141c formed at both ends of the first contact surface 141a is 45 × 35 mm and the first contact surface 141a is upwardly moved from the first contact surface 141a so that the α value is 75 °. It is bent and the 2nd contact surface 141b is used as 45x50mm.

As the thermal conductive part 142a provided on the first contact surface 141a, an elastomer pad having a size of 25 × 25 × 2 mm manufactured by the above-described process was used, and as the thermal conductive part 142b provided on the second contact surface 141b. 45 × 35 × 0.25mm acrylic foam tape AP4025 manufactured by LG Hausys was used.

Example 2

As shown in FIG. 2B, the middle cover 130, the heat sink 140, and the

heat conduction portions

142a and 142b of the heat sink 140 of the first embodiment are provided, and the middle cover 130 includes an upper portion. After the entire surface was coated with a heat radiation agent prepared by the above-described process to a thickness of 35㎛, it was equipped with a hardening treatment at 150 ℃ 25 minutes.

Comparative Example 1

As shown in FIG. 3B, four corners of the bottom surface of 35 × 35 × 3 mm are provided with 2.5 × 2.5 × 27 mm pins, and 2 × 2 × 27 mm pins are spaced at 2 mm intervals between the pins, respectively. And a heat sink 40 having a total of 81 fins was mounted on the heat generating element 1.

Temperature measurement result

The temperature of the heating element 1, the lower case 110 and the upper cover 120 according to Examples 1, 2 and Comparative Example 1 is as shown in Table 1.

Table 1

	A temperature (℃)-heating element	B Temperature (℃)-Bottom Case	C Temperature (℃)-Top Cover
Example 1	79 ℃	48 ℃	40 ℃
Example 2	73.2 ℃	44.3 ℃	37.1 ℃
Comparative Example 1	86 ℃	52 ℃	44 ℃

Based on the temperature measurement results of the embodiments and Comparative Example 1, the heat dissipation device of the TV set-top box according to Example 1 and Example 2, the heat dissipation performance compared to the heat dissipation device of the TV set-top box according to Comparative Example 1 It can be seen that this improvement. That is, the heat dissipation device of the TV set-top box according to the present invention has been improved because the heat transfer speed of the heat generating element 1 is transferred to the intermediate cover 130 through the heat sink 140, continuously super-integrated, ultra-light, It can cope with the heat dissipation problem of TV set-top box which is becoming ultra slim and low noise.

All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims

It is coupled between the lower case on which the substrate is seated and the upper cover covering the upper surface of the lower case is coupled to the intermediate cover in contact with the outside air,

A heat sink having a first contact surface in contact with a heating element mounted on the substrate, a second contact surface in contact with the intermediate cover, and a conductive plate connected between the first contact surface and the second contact surface,

The heat dissipation device of the TV set-top box, characterized in that the heat conducting portion is formed on each of the first contact surface and the second contact surface of the heat sink.
The method of claim 1,

The heat dissipation device of the TV set top box further comprises a heat dissipation unit provided on the upper surface of the middle cover.
The method of claim 2,

The heat radiating unit of the TV set-top box, characterized in that formed by applying a heat radiating agent.
The method of claim 3,

The heat dissipating device is a heat dissipating device of a TV set-top box, characterized in that the organic siloxane-based heat dissipating composition.
The method of claim 1,

The heat conduction unit is a heat radiation device of the TV set-top box, characterized in that the elastomer pad.
The method of claim 5,

The elastomer pad is a heat dissipation device of a TV set top box, characterized in that the polyol is synthesized by mixing hexamethylene diisocyanate, methylene diphenyl isocyanate, isophorone diisocyanate and dibutyl tin dilaurate.
The method of claim 6,

The elastomer pad is a heat dissipation device of a TV set-top box, characterized in that further comprises alumina powder and aluminum hydroxide.