KR20080010091A - Heat radiating system using noiseless air pushing apparatus - Google Patents

Abstract

A heat-radiating system using a noiseless air pushing device is provided to attach a plurality of heat pipes to the backside of an MCPCB(Metal Core Printed Circuit Board) to transfer heat generated from the MCPCB to both sides of the MCPCB and remove heat of heat-radiating pins attached to the ends of the heat pipes using an air pushing device to improve the operation stability of a back light unit having the MCPCB. A heat-radiating system includes a plurality of heat pipes(27a,27b), at least one heat-radiating pin(26a,26b) and a cooler. The plurality of heat pipes are arranged at a predetermined interval and transfer heat generated from an MCPCB(28) to at least one side of the MCPCB. The heat-radiating pin is connected to one end of each heat pipe and rapidly cools the heat transferred through the heat pipes. The cooler forcibly cools the heat-radiating pin.

Description

Heat Radiating System Using Noiseless Air Pushing Apparatus}

1A and 1B are a rear view and a cross-sectional view showing a heat dissipation structure for cooling the MCPCB of the backlight unit for LCD according to the prior art, respectively,

Figure 2a is a perspective view of a heat dissipation system using a noiseless air pushing device according to the present invention,

2b is a side view of a heat dissipation system according to the present invention;

3 is a perspective view of another embodiment structure according to the present invention;

4a to 4c are cross-sectional views each showing a structure of an air pushing device according to the present invention;

FIG. 5 is a drive circuit diagram of the air pushing device of FIG. 4C.

* Explanation of Signs of Major Parts of Drawings *

20a, 20b: barrel 21: air intake port

21a: intake valve 22: air outlet

22a: exhaust valve 23: LED

24: surface light source 26a, 26b: heat radiation fin

27a, 27b: heat pipe 28: MCPCB

30,30a, 30b: Air push unit 31: Signal generator

32: voltage amplifier 33,35: variable resistor

34: power amplifier 41: permanent magnet

42, 51: York 43: Top plate

44,53: Drive coil 45,54: Bobbin

46,56: Frame 46a, 56a: Air passage

47,52; Diaphragm 48,58: Edge

49: damper 50: electromagnet

62: coil

The present invention relates to a heat dissipation system using a noiseless air pushing device, and more particularly, heat generation such as a backlight unit (BLU) and a PDP (plasma display panel) of an LCD (liquid crystal display). The present invention relates to a heat dissipation system using a noiseless air pushing device capable of effectively cooling while reducing noise for many devices.

Display devices using optical characteristics, such as LCDs, which have recently increased in use, use light control devices such as a backlight unit (BLU) to provide a clear image. Such a device is composed of a light source unit and a portion that evenly spreads the light from the light source. In particular, various attempts have been made to reproduce brighter and more vivid colors, and at present, CCFLs (Cold Cathode Fluorescent Lamps) are most frequently used. However, it is difficult to use CCFL since it contains mercury, which is an environmental regulatory substance. Therefore, studies on alternative light sources are being actively conducted, and BLU using light emitting diodes (LEDs), which are environmentally friendly light sources, has been discussed as the best alternative. However, since LEDs generate a lot of heat in addition to bright light, the demand for heat dissipation systems is greatly increased.

Conventionally, two methods of using about 4000 LEDs of low brightness and about 400 LEDs of high brightness have been studied as a method of using LEDs as BLUs. In the former case, the heat generation is relatively small, so it is somewhat advantageous in heat dissipation design. However, since a large amount of LEDs must be assembled, there is a problem in the manufacturing process and the configuration of the interlocking circuit with the screen. It is possible to configure the interlocking circuit with sufficient brightness and screen, but if there is no separate cooling device, it may cause the LED life degradation and malfunction of the electronic circuit due to heating.

Typically, the external quantum efficiency of LEDs is known to be about 30%. Therefore, about 60% of the heat is emitted, so without proper cooling, not only the LED itself but also the peripheral parts may be damaged.

Conventionally, as shown in FIG. 1, in order to more effectively remove heat generated from a plurality of LEDs 13, a surface light source 4 having a plurality of LEDs 13 mounted on a metal core PCB (MCPCB) 8. Has been proposed, and the surface light source 4 conducts and dissipates heat generated in the LED 13 on the surface of the MCPCB 8.

Furthermore, in order to stably obtain a high quality image, conventionally, a plurality of separate cooling fans 2 are attached to one side of the storage container 1 in order to remove heat generated from the high brightness LEDs 13. The method of forcibly discharging heat is used. In this case, a plurality of air suction holes 3 are formed in the storage container 1, so that the plurality of cooling fans 2 discharge the air inside the storage container 1 to the outside, where the outside air is relatively low in temperature. Is introduced into the inner space 5 of the storage container 1 and discharged through the cooling fan 2.

However, in the conventional technology, since a plurality of cooling fans 2 cause high-speed air flow by high-speed rotational movement, the rotation noise of the cooling fans 2 is greatly generated, and consumers complain of discomfort due to these noises. Doing. This problem becomes more serious as the number of cooling fans 2 increases with the increase in output of the cooling fans 2 as the size of the display increases.

Therefore, the present invention has been made to overcome the problems of the prior art, the purpose is to mount a plurality of heat pipes on the back of the MCPCB mounted with a plurality of LEDs to transfer heat to both sides outside, the heat pipe end portion It is to provide a heat dissipation system using a noise-free air pushing apparatus that can improve the operating stability of the BLU equipped with MCPCB by removing the heat of the mounted heat radiation fin by the air pushing device.

Another object of the present invention is to install a plurality of heat pipes on the front or rear of the heat-radiating body, such as a surface light source or PDP, and to improve the operating stability of the heat-radiating body by forcibly cooling the heat radiation fins mounted on the heat pipe end portion. To provide a heat dissipation system.

In order to achieve the above object, the present invention is a heat dissipation system for heat dissipating a MCPCB mounted with a plurality of heating elements, the plurality of arranged at regular intervals to transfer the heat generated from the MCPCB to at least one side of the MCPCB A heat pipe, at least one heat dissipation fin connected to one end of the heat pipe to quickly cool the heat transferred to the side of the MCPCB through the heat pipe, and cooling means for forcibly cooling the heat dissipation fin. To provide a heat dissipation system.

In this case, the cooling means comprises an air pushing device for pushing the air by linearly moving the diaphragm at a frequency below the audible frequency.

In addition, the system of the present invention surrounds the heat dissipation fins to prevent the return to the MCPCB while effectively dissipating the heat generated by the heat dissipation fins, and installed in the air intake and the barrel having an air inlet and an air outlet in the lower and upper, respectively And an intake valve for sucking the outside air into the barrel and an exhaust valve installed at the air outlet to discharge the inside air to the outside of the barrel. The cooling means linearly moves the diaphragm at a frequency below the audible frequency. And an air pushing device for pushing the air, and the air pushing device is preferably installed adjacent to the air intake port at the bottom of the barrel.

The air pushing device may be configured as a diaphragm driving device of a magnetic gap type.

In this case, the diaphragm driving device includes a driving circuit for applying a driving signal whose polarity is periodically changed to the driving coil, wherein the driving circuit includes a signal generator for generating a signal below an audible frequency, and a sine wave of the signal generator. A voltage amplifier for voltage amplifying the signal, and a power amplifier for power amplifying the voltage amplified sinusoidal signal.

The apparatus may further include a barrel having an air inlet and an air outlet at the bottom and the top thereof, respectively, to surround the heat dissipation fin while effectively dissipating heat generated from the heat dissipation fin and preventing return to the MCPCB. Installed in the inlet and / or the air discharge port may be configured as a blower for sucking the outside air into the barrel or discharge the inside air to the outside of the barrel.

Furthermore, the heat dissipation fins are disposed on both sides of the MCPCB, respectively, and the plurality of heat pipes are sequentially disposed on the rear surface of the MCPCB so that one end thereof is extended to one side and the other side of the MCPCB so as to be connected to the heat dissipation fins, respectively, so as to reduce the temperature deviation of the entire area. It is preferable.

According to another feature of the invention, the present invention is mounted on one side of the heating element, and one end is sequentially extended to one side and the other side of the heating element to transfer a plurality of heat generated from the heating element to both sides of the heating element First and second heat dissipation fins connected to a heat pipe and one end extending to one side and the other side of the heat pipe, respectively, to rapidly cool the heat transferred to both sides of the heating element through the heat pipe; 2, the first and second barrels surrounding the heat dissipation fins and effectively dissipating heat generated by the heat dissipation fins to prevent the return to the heating element, and having air inlets and air outlets at both ends thereof, and the air inlets or air outlets. Is provided a heat dissipation system, characterized in that composed of a blowing means for discharging the internal air to the outside of the barrel The ball.

As described above, in the present invention, a plurality of heat pipes are mounted on the front or the rear of a surface light source such as a BLU of a LCD or a heat-radiating body such as a PDP, and the air pipe is operated at an end portion of the heat pipe by an air pushing device operated below an audible frequency. By removing the heat of the heat dissipation fins mounted, it is possible to improve the operational stability of the heat-radiating body.

(Example)

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention described above in more detail.

2A and 2B are a perspective view and a side view of a heat dissipation system according to the present invention.

First, in the heat dissipation system according to the present invention shown in FIGS. 2A and 2B, a plurality of LEDs 23 are installed in a MCPCB 28 to form a surface light source 24 as a whole. The structure applied to cool the BLU) is illustrated.

The heat dissipation system according to the present invention includes a MCPCB 28 capable of mounting and supporting a plurality of LEDs 23, and a pair of heat dissipation fins 26a arranged on both sides of the MCPCB 28 to heat the MCPCB 28. A plurality of heat pipes (27a, 27b) for fast thermal equilibrium by passing up to (26b), a pair of heat radiation fins (26a, 26b) for quickly cooling the heat of the heat pipes (27a, 27b), and the heat radiation fins It consists of a pair of air pushing devices 30a and 30b for pushing the air by generating a linear motion of the diaphragm continuously below the audible frequency so as to help the cooling of the 26a and 26b more smoothly.

In this case, the MCPCB 28 is formed of a material made of aluminum, copper or alloys thereof having excellent thermal conductivity in order to quickly transfer heat generated from a plurality of LEDs 23 and to maintain the arrangement of the LEDs 23. The conductive pattern is formed on the MCPCB 28 substrate to directly assemble a plurality of LEDs 23 so that the heat generated when the LEDs 23 emit light is evenly distributed over the entire area of the MCPCB 28. Minimize the color temperature difference according to the temperature change.

In addition, in order to improve heat spreadability of the heat generated from the MCPCB 28 and to rapidly transfer heat to the pair of heat dissipation fins 26a and 26b, the MCPCB 28 may be sequentially connected to a plurality of heat pipes 27a and 27b. It is disposed on the back of the MCPCB 28 so as to extend to one side and the other side of. The plurality of heat pipes 27a and 27b are filled with liquids that are easily vaporized such as water, alcohol, acetone, etc., and have a microstructure formed on the inner wall by sintering with oxygen-free copper powders. The outer wall tube of the heat pipe is also composed of copper or an alloy having excellent thermal conductivity. Heat pipes (27a, 27b) is preferably plated with a metal such as nickel and tin to facilitate bonding with the MCPCB (28).

In the present invention, by alternately installing a plurality of heat pipes (27a, 27b) on the back of the MCPCB 28, it is possible to make a uniform surface light source because the temperature deviation of the entire area is reduced.

A pair of heat dissipation fins 26a and 26b are mounted at both end portions of the heat pipes 27a and 27b to effectively dissipate heat. In this case, one end of the heat pipes 27a and 27b is preferably a pair of heat dissipation fins. (26a, 26b) are arranged so as to penetrate each so as to effectively radiate heat. The heat dissipation fins 26a and 26b use a metal material such as copper, aluminum or an alloy having excellent thermal conductivity, and are designed and arranged to have a wide surface area to maximize a cooling effect.

A pair of barrels 20a and 20b are disposed on the outside of the pair of heat dissipation fins 26a and 26b to prevent heat emitted from the heat dissipation fins 26a and 26b from being returned to the inside of the heat-radiating body, that is, the MCPCB 28. And the barrel (20a, 20b) is formed on each side end of the air inlet port 21 and the air outlet port 22, the air flow can be adjusted along the flow of air. Air pushing devices 30a and 30b are provided at the lower portions of the barrels 20a and 20b to discharge air by pressurizing the air sucked adjacent to the air inlet 21 toward the air outlet 22. .

In the present invention configured as described above, a plurality of LED 23 lamps are mounted on the MCPCB 28 to conduct heat generated from the LED 23 to the PCB surface to disperse them, and a plurality of heat pipes on the front or rear surface of the printed circuit board. (27a, 27b) to transfer heat to both sides. In this way, heat transferred to both sides of the heat pipes 27a and 27b is radiated through a pair of heat dissipation fins 26a and 26b attached to the distal portions of the heat pipes 27a and 27b.

In addition, the pair of heat dissipation fins 26a and 26b is provided with a pair of barrels 20a and 20b on the outside to prevent the heat from being returned to the MCPCB 28 while effectively dissipating heat. Since the air pushing apparatuses 30a and 30b installed adjacent to the air inlet 21 are operated by a drive signal having a frequency lower than or equal to the audible frequency (20 Hz) as described below, the diaphragm also has a frequency lower than or equal to the audible frequency (20 Hz). It generates a vibration output, that is, air pressure continuously.

In this case, the intake valve 21a and the exhaust valve 22a are provided in the air inlet 21 and the air outlet 22 of the barrel 20a, 20b, respectively, and the diaphragm of the air pushing apparatus 30a, 30b is moved up and down. In movement, the intake valve 21a and the exhaust valve 22a are synchronized with this to allow external air introduced through the air inlet 21 to be discharged to the outside through the air outlet 22. That is, when the diaphragm of the air pushing device 30a, 30b is lowered, the intake valve 21a is opened and the exhaust valve 22a is closed. When the diaphragm is raised, the intake valve 21a is closed and the exhaust valve 22a is closed. Control is performed in synchronization with a drive signal described later to open.

As a result, the relatively cool external air sucked into the air inlet 21 is pushed toward the air outlet 22 positioned at the upper portion thereof, thereby rising while being in contact with the outside of the heat dissipation fins 26a and 26b. Heat exchange takes place in the hot air exhaust.

Therefore, the heat of the heat radiation fins 26a and 26b is removed to improve the stability of the entire BLU system including the MCPCB 28.

In addition, in the present invention, by using the air-pushing device (30a, 30b) similar to the magnetic gap type speaker for the forced cooling of the heat radiating fins (26a, 26b) effectively heat without noise without installing a separate cooling fan (2) It is effective to release to the outside.

Since the second embodiment shown in FIG. 3 uses the small heat dissipation fins 26a and 26b, a pair of vertical ends of each of the plurality of heat pipes 27a and 27b alternately arranged parallel to the rear surface of the MCPCB 28 are respectively. Small heat dissipation fins 26a and 26b are coupled to an extension of some of the plurality of heat pipes 27a and 27b, and the air-pushing devices 30a and 30b are connected to each other. It is installed adjacently without using.

Therefore, in the second embodiment, the pressurized air generated from the air pushing apparatuses 30a and 30b undergoes heat exchange while passing through the heat radiating fins 26a and 26b, thereby cooling the heat radiating fins 26a and 26b.

Hereinafter, the detailed configuration and operation of the air pushing device (30a, 30b) will be described.

The air pushing device 30 may be implemented by using a diaphragm driving device of a magnetic gap type. A representative example of the magnetic gap diaphragm drive is an electro-acoustic converter, ie a speaker. However, a speaker generally uses cone-shaped paper as a diaphragm for reproducing an audio signal, which causes a problem of weak durability. In the present invention, it is designed in consideration of these problems.

Referring to FIG. 4A, the air pushing device 30 includes a magnet of a magnetic circuit M in which a permanent magnet 41 is installed inside the yoke 42 and a top plate 43 is installed on the magnet 41. The bobbin 45 in which the driving coil 44 is wound is located in the gap G. In addition, the upper part of the bobbin 45 is attached to the center part of the diaphragm 47 which consists of metal materials, and the outer peripheral part of the diaphragm 47 is fixed to the upper end part of the frame 46 via the flexible edge part 48. As shown in FIG.

The air-pushing device 30 shown in FIG. 4A has a magnetic structure in which the permanent magnet 41 is installed inside the yoke 42, but the permanent magnet 41 of the yoke 42 as shown in FIG. It is also possible to form an external-shaped structure installed on the outside.

Referring to FIG. 4B, the air pushing device 30 having an external structure has an annular permanent magnet 41 installed outside the yoke 42, and has a rod-shaped center pole upward from the center of the yoke 42. The bobbin 45 in which the drive coil 44 is wound is located in the magnetic gap G of the magnetic circuit M in which 42a) protrudes and the top plate 43 is installed on the permanent magnet 41. In addition, the upper part of the bobbin 45 is attached to the center part of the diaphragm 47 which consists of metal materials, and the outer peripheral part of the diaphragm 47 is fixed to the upper end part of the frame 46 via the flexible edge part 48. As shown in FIG.

In general, the magnetic structure has the advantage that less leakage magnetic flux than the magnetic structure, but the magnetic structure is advantageous in terms of generating a large output because the size of the permanent magnet 41 can be used is small. .

The diaphragm 47 is preferably made of a metal material in consideration of durability in place of the cone used as the diaphragm of the speaker, the air pushing device 30 is a drive signal having a frequency of less than the audible frequency (20Hz) When applied to the drive coil 44, the diaphragm 47 has a non-rotating magnetic flux generated in the fixed magnetic circuit (M) and the alternating rotational magnetic flux generated in the drive coil (44) capable of vertical flow According to the Fleming's left-hand law, the vibration plate 47 and the drive coil 44 vibrate up and down by the suction and repulsion forces generated in response to each other, thereby generating a vibration sound pressure corresponding to the drive signal. Therefore, the diaphragm 47 of the air pushing device 30 acts to pressurize the air by vibrating up and down at a frequency below the audible frequency. In this case, a plurality of air passages 46a are perforated in the frame 46 so that a smooth vibration can be made when the diaphragm 47 vibrates up and down.

In FIG. 4B, reference numeral 49 denotes a damper for limiting the vibration range of the diaphragm 47. The use of the damper may include the characteristics of the material of the diaphragm 47 and the edge portion 48, and the driving coil 44. It should be determined whether or not the yoke 42 of the magnetic circuit is designed to sufficiently accommodate the distance at which the diaphragm vibrates up and down at the maximum value of the driving signal applied to the?

On the other hand, referring to Figure 4c, the magnetic gap-type air-pushing device 30 according to the present invention is an electromagnet 50 instead of using a permanent magnet 41 in the embodiment shown in Figures 4a and 4b The bobbin 54 in which the drive coil 53 for driving the diaphragm 52 to drive up and down is inserted in the magnetic gap G formed in the magnetic circuit using (circle).

The electromagnet 50 is wound by a coil 62 to which a direct current power source (DC) is applied to the yoke (51), thereby supplying a strong and continuous direct current magnetic flux into the magnetic circuit. Therefore, it plays a role in inducing up and down movement.

The yoke 51 forming the magnetic circuit passage protrudes upward from the center of the base 51a and the center of the base 51a similarly to the yoke 42 of the magnetic structure shown in FIG. 4A. A rod-shaped center pole 51b wound around 62, a cylindrical outer extension 51c extending upward from the end of the base 51a by the height of the center pole 51b, and an outer extension 51c. It consists of the magnetic gap formation part 51d which extends two steps inwardly from the inside, and forms the magnetic gap G between the upper end of the center pole 51b.

Therefore, the yoke structure has a space structure in which a sufficient amount of the electromagnet coil 62 can be wound between the center pole 51b and the outer extension portion 51c, thereby making it possible to construct a strong electromagnet. In this case, the magnetic gap forming portion 51d of the yoke 51 has the driving coil 53 and the bobbin 54 so that the magnetic force is effectively applied to the driving coil 53 which is inserted into the magnetic gap G and vibrates up and down. It is preferable to form long so that () may cover the range which vibrates enough.

In addition, the upper portion of the bobbin 54 is attached to the central portion of the diaphragm 52 made of metal, the outer peripheral portion of the diaphragm 52 is fixed to the upper end of the frame 56 through the flexible edge portion 58, the frame A plurality of air passages 56a are perforated in the 56 so that the vibration plate 52 vibrates up and down.

The electromagnet coil 62 wound around the center pole 51b of the yoke 51 has a winding direction of the coil so that the upper end of the center pole 11b forms the N pole, and the magnetic gap forming portion 51d forms the S pole. Set the current flow direction. Therefore, when a sinusoidal wave drive signal whose polarity is periodically changed is applied to the drive coil 53, the alternating rotation magnetic field of the drive coil 53 and the direct current magnetic field interact with each other in the magnetic gap G, so that the bobbin ( The drive coil 3 wound around 54 vibrates up and down within the magnetic gap G, and as a result, the diaphragm 52 also vibrates up and down.

Meanwhile, as shown in FIG. 5, the air pushing device 30 includes a variable resistor 35 for frequency setting to apply, for example, a sine wave driving signal whose polarity is periodically changed to the driving coil 53. A sinusoidal signal generator 31 for generating a sinusoidal signal having a frequency in the range of 1 to 20 Hz according to the resistance value setting of the variable resistor 35 for frequency setting, and for voltage amplifying the sinusoidal signal of the sinusoidal signal generator 31. A voltage amplifier 32, a power amplifier 34 for power amplifying the voltage amplified sine wave signal, and a voltage inserted between the voltage amplifier 32 and the power amplifier 34 and applied to the power amplifier 34 It includes a power control variable resistor 33 that allows to select the power of the drive signal applied to the drive coil 53 by adjusting the value. In this case, the driving signal may be a signal other than a sine wave signal, and another signal whose polarity is inverted periodically, for example, a square wave signal.

The above driving circuit can be applied to all of the air pushing apparatus 30 shown in FIGS. 4A to 4C.

In the air pushing device 30 of the present invention configured as described above, first, when DC power is applied to the coil 62 for the electromagnet and the coil 62 is excited, the yoke 51 forms an electromagnet accordingly. As a result, the upper end of the center pole 51b forms the north pole, and the corresponding magnetic gap forming portion 51d forms the south pole. As a result, a magnetic gap G is formed between the upper end of the center pole 51b and the magnetic gap forming portion 51d among the magnetic circuits formed by the yoke 51 of the electromagnet 50.

At this time, if the user adjusts the frequency setting variable resistor 35 to set a desired resistance value (that is, a frequency value), the sinusoidal signal having any one frequency in the range of 1 to 20 Hz is accordingly sinusoidal signal generator 31. Is generated from and applied to the voltage amplifier 32. In the voltage amplifier 32, a voltage amplification is performed in advance so that sufficient power amplification can be achieved in the power amplifier 34 of the rear stage.

Thereafter, the voltage amplified sine wave signal is applied to the driving coil 53 wound around the nonmagnetic bobbin 54 by power amplification of the sine wave signal to a value selected according to the user's setting value of the variable resistor 33 for power adjustment.

Therefore, when a sinusoidal wave drive signal whose polarity is periodically changed is applied to the drive coil 53, the alternating rotation magnetic field of the drive coil 53 and the direct current magnetic field interact with each other in the magnetic gap G, so that the bobbin ( Since the polarity of the sine wave driving signal is periodically reversed, the driving coil 53 wound on the 54 is vibrated up and down in the magnetic gap G, and as a result, the vibration plate 52 also vertically vibrates up and down. You lose.

In the air-pushing apparatus 30 according to the present invention, since the vibration plate 52 vertically vibrates up and down in response to the polarity inversion of the drive signal, accurate control of the number of vertical vibrations is performed in response to the frequency setting of the drive signal. It is possible, and the vibration plate vibrates up and down at the time of vertical vibration so that no noise is generated.

Therefore, in the air pushing device 30 employed in the present invention, the driving coil 53 is inserted into the magnetic gap of the magnetic circuit using the electromagnet, which can generate a strong magnetic force even at a frequency of 20 Hz or less, thereby providing sufficient vertical vibration force. To provide.

As described above, in the present invention, the heat pipes 27a and 27b are alternately disposed on the entire rear surface of the MCPCB 28 so that the heat generated from the LEDs 23 is evenly distributed over the entire surface. Not only can the variation of the variation be reduced, but the high-brightness LED 23 can be arranged in various patterns on the plane of the MCPCB 28, so that the synchronization design according to the screen change is also easy.

In the above embodiment, a pair of heat dissipation fins are disposed on both sides and the heat pipes are alternately connected to the heat dissipation fins arranged on one side and the other side to reduce the temperature deviation. However, the heat dissipation fins are disposed only on one side and the ends of all the heat pipes. It is also possible to connect.

In addition, in the above embodiment, a magnetic gap type air pushing device 30a or 30b is used for forced cooling of the heat dissipation fins 26a and 26b in order to implement a noiseless heat dissipation system. However, the air inlet 21 and the air outlet 22 It is also possible to pressurize the outside air to the inside of the barrel (20a, 20b) by using a blower (not shown) on either or both sides or to exhaust the air inside. In this case, as compared with the case of using a plurality of cooling fans in the prior art, the level of noise is significantly reduced, and the heat dissipation effect is also excellent.

As described above, in the present invention, the heat pipes are alternately installed on the front or the rear of the MCPCB on which the plurality of LEDs are mounted, and the heat dissipation fins mounted on the heat pipe ends are removed by an air pushing device to reduce the temperature deviation of the entire area. Not only can produce a uniform light source, but also improve the operation stability of the BLU having the MCPCB, and the design of the pattern on the front of the MCPCB can be provided to the designer can provide design benefits.

In addition, by using an air pushing device operating below the audible frequency, it is possible to effectively discharge the heat generated from the inside to the outside effectively without installing a separate cooling fan has the advantage of reducing the cooling fan noise.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (10)

In the heat dissipation system for heat dissipation of the MCPCB (Metal Core PCB) mounted with a plurality of heating elements, A plurality of heat pipes installed at a front surface or a rear surface of the MCPCB and arranged at regular intervals to transfer heat generated from the MCPCB to at least one side of the MCPCB; At least one heat dissipation fin connected to one end of the heat pipe to rapidly cool the heat transferred to the side of the MCPCB through the heat pipe; And a cooling means for forcibly cooling the radiating fins. The heat dissipation system according to claim 1, wherein the cooling means comprises an air pushing device for pushing the air by linearly moving the diaphragm at a frequency below the audible frequency. The tube of claim 1, further comprising: a barrel having an air inlet and an air outlet, respectively surrounding the heat dissipation fins to prevent returning to the MCPCB while effectively dissipating heat generated from the heat dissipation fins. An intake valve installed at the air inlet to suck external air into the barrel; Installed in the air outlet further comprises an exhaust valve for discharging the internal air to the outside of the barrel, And the cooling means comprises an air pushing device for pushing the air by linearly moving the diaphragm at a frequency lower than the audible frequency, and the air pushing device is installed adjacent to the air inlet of the lower part of the barrel. 4. The heat dissipation system of claim 3, wherein the air pushing device comprises a diaphragm driving device of a magnetic gap type. 5. The apparatus of claim 4, wherein the diaphragm driving device includes a driving circuit for applying a driving signal whose polarity is periodically changed to the driving coil, wherein the driving circuit includes a signal generator for generating a driving signal below an audible frequency, and And a power amplifier for voltage amplifying the drive signal of the signal generator, and a power amplifier for power amplifying the voltage amplified drive signal. The method of claim 1, further comprising a barrel having an air inlet and an air outlet, respectively surrounding the heat dissipation fins to prevent returning to the MCPCB while effectively dissipating heat generated by the heat dissipation fins. The cooling means is installed in the air inlet and / or the air outlet is a heat dissipation system, characterized in that composed of a blower for sucking the outside air into the barrel or discharge the inside air to the outside of the barrel. The heat dissipation fin of claim 1, wherein the heat dissipation fins are disposed on both sides of the MCPCB, respectively. The plurality of heat pipes are sequentially arranged on the back of the MCPCB so that one end is extended to one side and the other side of the MCPCB so as to be connected to the heat radiating fins, respectively, so that the temperature deviation of the entire area is reduced. The heat dissipation system according to claim 1, wherein said cooling means is constituted by a blower. The heat dissipation system according to any one of claims 1 to 8, wherein the MCPCB forms a backlight unit (BLU) for LCD. A plurality of heat pipes mounted on one side of the heating element and sequentially extending to one side and the other side of the heating element to transfer heat generated from the heating element to both sides of the heating element; First and second heat dissipation fins connected to one end extending to one side and the other side of the heat pipe, respectively, to rapidly cool the heat transferred to both sides of the heating element through the heat pipe; First and second barrels surrounding the heat dissipation fins to prevent the heat from the first and second heat dissipation fins from being returned to the heating element, and having air inlets and air outlets at both ends; Heat dissipation system is installed in the air inlet or air discharge port characterized in that it comprises a blowing means for discharging the internal air to the outside of the barrel.

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