KR102116126B1 - Heat radiate device for Reflector and headlamp comprising the same - Google Patents

Abstract

The present invention relates to a reflector heat dissipation device and a head lamp including the same, and includes a heat dissipation part located outside the reflector, and a heat conduction part connecting the reflector and the heat dissipation part, wherein the heat conduction part is located outside the reflector to reflect the reflector. And a fixed body spaced apart, and a plurality of ribs protruding from the fixed body to contact the reflector, and fixing the reflector inside the fixed body.

Description

Heat radiator device and headlamp comprising the same

The present invention relates to a reflector heat dissipation device and a head lamp comprising the same.

The vehicle is equipped with various vehicle lamp modules having a lighting function for easily checking objects located around the vehicle at night and a signal function for notifying other vehicle or road users of the vehicle's driving status. For example, among vehicle lamp modules, headlamps and fog lamps are intended for lighting functions, and turn signals, taillights, brake lights, and vehicle lights are for signal functions.

The headlamp has an essential function to secure the driver's view at night by irradiating light in the same direction as the driving direction of the vehicle. Such a headlamp module for a vehicle is a light source for irradiating light, and an incandescent light bulb or a halogen lamp module is mainly used. Recently, an LED having low power consumption and excellent straightness of light is used as a light source.

Recently, the automotive industry has been forming a trend toward a light source with excellent reliability, design, functionality, and energy efficiency, and the heat dissipation problem, which is a core technology, has been proposed.

Heat generation due to high integration of electronic devices causes malfunction of devices, deterioration of substrates and reflectors. In addition, the amount of light and the life were reduced by the heat generated inside the sealed headlamp.

In addition, the heat dissipation structure of the LED head lamp is inserted with a thermal pad made of silicon for the purpose of promoting heat transfer between the LED element, which is the heating part, the aluminum PCB, and the heat sink. However, in the case of the silicone-based heat-conducting tape, contact failure occurred due to adhesion of an insulating material produced by a low molecular weight siloxane.

Public utility model No. 20-1998-054100 (1998.10.07.) Patent Publication No. 10-2013-0026263 (2013.03.13.)

The present invention provides a technique for releasing heat generated inside the headlamp to the outside and movably supporting the reflector.

A reflector heat dissipation device according to an embodiment of the present invention includes a heat dissipation part located outside the reflector, and a heat conduction part connecting the reflector and the heat dissipation part, wherein the heat conduction part is located outside the reflector and spaced apart from the reflector. And a plurality of ribs protruding from the fixed body and contacting the reflector, and fixing the reflector inside the fixed body.

The plurality of ribs have elasticity, and can elastically contact the outside of the reflector.

Each of the plurality of ribs may be in line contact with the outer surface of the reflector.

The heat dissipation unit may include a heat dissipation body contacting the outside of the housing to which the fixed body is fixed, and a plurality of heat dissipation members protruding from the heat dissipation body and spaced apart from each other.

The heat-conducting portion and the heat-radiating portion each include 3 to 50% by weight of a polymer matrix, and 50 to 97% by weight of a polymer coated ceramic powder dispersed in the matrix, wherein the polymer coated ceramic powder includes a polymer coating layer and the polymer coating layer. It includes spherical ceramic particles or agglomerates thereof located therein, and the spherical ceramic particles may have an average particle diameter of 0.1 to 30 μm.

The spherical ceramic particles may be a mixture of first particles having an average particle diameter of 15 to 30 μm, second particles having an average particle diameter of 7 to 13 μm, and third particles having 3 to 6 μm.

The heat-conducting portion and the heat-radiating portion may be metal.

The head lamp according to an embodiment of the present invention includes: a housing in which the front surface is open, a cover disposed in the housing open front surface, a reflector disposed in the housing, a lamp module disposed in the reflector, and the above-described reflector heat dissipation It includes a device, the heat dissipation unit of the heat sink of the reflector is located outside the housing, the heat conduction unit of the heat sink of the reflector may be located between the reflector and the housing.

The housing includes 3 to 50% by weight of a polymer matrix, and 50 to 97% by weight of a polymer coated ceramic powder dispersed in the matrix, wherein the polymer coated ceramic powder has a polymer coating layer and a spherical shape located inside the polymer coating layer. It includes ceramic particles or aggregates thereof, and the spherical ceramic particles may have an average particle diameter of 0.1 to 30 μm.

The polymer coating layer, polyethylene glycol, polyvinyl acetate, polyethylene oxide, polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, polyacrylic acid, polyphosphoric acid, polyethylene sulfonic acid, polyamine, polyurethane, carboxy methyl cellulose, poly It may be any one selected from the group consisting of oxychelylene glycol, and combinations thereof.

The spherical ceramic particles may be a mixture of first particles having an average particle diameter of 15 to 30 μm, second particles having an average particle diameter of 7 to 13 μm, and third particles having 3 to 6 μm.

Based on 1 part by weight of the first particles, the second particles may include 0.5 to 1.5 parts by weight, and the third particles may include 8 to 12 parts by weight.

The polymer matrix may be any one selected from the group consisting of polybutylene tetraphthalate, polycarbonate, polypropylene, acrylonitrile butadiene styrene (ABS) resin, polymethyl methacrylate, and combinations thereof.

According to an embodiment of the present invention, since the heat sink and the reflector where the lamp module is located are connected through a heat conduction unit, heat generated in the reflector by the lamp module can be quickly conducted to the heat sink and radiated. Accordingly, it is possible to prevent deterioration of the substrate or reflector due to heat.

According to an embodiment of the present invention, since the heat of the reflector is quickly discharged to the heat dissipation unit through the heat conduction unit, it is possible to prevent the amount of light and life of the headlamp from being reduced.

According to an embodiment of the present invention, since the thermally conductive portion is in elastic contact with the outer surface of the movable reflector, the contactor can always be kept in contact even when the reflector moves, and the thermally conductive portion is in contact with the outer surface of the reflector, so that the reflector can move freely. Can be.

According to an embodiment of the present invention, by using a pellet for injection molding, a ceramic granule mixed with a ceramic granule capable of high heat transfer coefficient and excellent molding flowability and high density molding during molding compression, due to the strong hardness of the ceramic when melted and flowed during injection While not damaging the screws or the like of the injection molding machine, the fluidity of the dry powder is significantly improved, and the heat conduction unit, heat dissipation unit, and housing of a complex structure can be efficiently manufactured with little damage to the injection molding machine.

According to the embodiment of the present invention, since the housing, the heat conduction portion and the heat dissipation portion are made of pellets for injection molding, various designs can be produced.

According to the embodiment of the present invention, since the housing is made of pellets for injection molding, heat inside the housing is rapidly discharged to the outside of the housing, thereby preventing damage due to heat generated in the lamp module.

1 is a schematic view showing a head lamp according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of Figure 1;
3 is an enlarged view of the heat conduction unit of FIG. 2.
4 is a schematic view showing a state in which the reflector of FIG. 2 and the heat conduction unit are combined.
5 is a cross-sectional view of FIG. 1 taken along line VV.
6 and 7 are schematic views showing another embodiment of the heat dissipation unit of FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The same reference numerals are used for similar parts throughout the specification.

The reflector heat dissipation device according to an embodiment of the present invention can be applied to a head lamp which is an embodiment of the present invention, and hereinafter, description will be mainly made of a head lamp to which a reflector heat dissipation device is applied.

Then, a head lamp according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

1 is a schematic view showing a head lamp according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is an enlarged view of the heat conduction unit of FIG. 2, and FIG. 4 is a reflector and a heat conduction unit of FIG. 5 is a cross-sectional view of FIG. 1 taken along the line VV.

First, referring to FIGS. 1 and 2, the head lamp 1 according to the present embodiment includes a housing 20, a cover 30, a reflector 40, a lamp module 50, and a reflector heat dissipation device 10. Includes, and discharges heat generated inside the head lamp to the outside, and does not cause contact failure and is not exposed to the risk of electric leakage.

The housing 20 forms the outer shape of the headlamp and can be fixed to the chassis of the vehicle and the front side is open. A hole 21 is formed in the rear of the housing 20 to communicate with the inside of the housing 20 to the outside and to which the lamp module 50 is fixed, and a stopper for fixing the lamp module 50 in the periphery of the hole 21 ( 51) are combined. An insertion preventing projection 22 is formed at a predetermined position spaced inward from the front surface of the housing 20 to catch the fixed body 121 of the heat conduction unit 12. The insertion preventing protrusion 22 is formed along the inner circumference of the housing 20. However, the insertion preventing protrusion 22 may be formed at a plurality of intervals along the inner circumference of the housing 20. When the fixed body 121 is caught in the insertion preventing projection 22, the heat conduction unit 12 is no longer inserted into the housing 20.

The socket part of the lamp module 50 is connected to the stopper 51 and the light emitting part of the lamp module 50 is located inside the housing 20.

The cover 30 is disposed on the open front side of the housing and prevents foreign matter from entering the housing 20, and protects the lamp module and the reflector disposed inside the housing from external requirements.

The reflector 40 is disposed inside the housing 20, and the outer circumference of the reflector 40 is spaced apart from the inner circumference of the housing 20. The reflector 40 is formed in a curved surface from front to rear.

The front surface of the reflector 40 is open, and the inner circumference of the reflector 40 includes a reflective surface. The reflector 40 is formed with a through hole 41 through which the light emitting part of the lamp module 50 passes. Inside the reflector 40, a light emitting unit is located, and light emitted from the light emitting unit is irradiated toward the front of the vehicle through the cover 30 as a reflection of the reflective surface.

Meanwhile, the lamp module 50 is assumed to have a socket portion fixed to the housing 20, but the lamp module 50 may be fixed to the reflector 40. The reflector 40 can move inside the housing 20.

The detailed structure of the housing 20, the cover 30, the reflector 40, and the lamp module 50 may be applied to a well-known automobile headlamp configuration, and a detailed description of the structure will be omitted. However, the housing 20 is made of a fillet for injection molding, which will be described later, and can quickly discharge heat inside the housing 20 to the outside.

Next, a reflector heat dissipation device will be described with reference to FIGS. 3 to 5 further.

3 to 5, the reflector heat dissipation device 10 includes a heat dissipation unit 11 and a heat conduction unit 12, and the lamp module 50 houses heat generated from the reflector 40 in the housing 20. ) Release to the outside.

The heat dissipation unit 11 includes a heat dissipation body 111 and a heat dissipation member 112, expands an area of the housing 20, and discharges internal heat of the housing 20. The heat dissipation unit 11 faces the engine room while the housing 20 is mounted on the vehicle chassis. Accordingly, heat is transferred to the engine room to radiate heat.

The heat dissipation body 111 has a predetermined width and is arranged and fixed on the outer circumference of the housing 20. The heat dissipation body 111 is not coupled to the housing 20 by a screw structure, but is coupled by an assembly structure such as a protrusion and a groove. The heat dissipation body 111 and the housing 20 are in surface contact.

However, the heat dissipation body 111 may be integrally formed with the housing 20. Accordingly, the heat dissipation body 111 may be disposed along the outer circumference of the housing 20, and the housing and the heat dissipation portion may be manufactured in various forms, so that the design of the head lamp may be varied.

The heat dissipation member 112 protrudes from the heat dissipation body 111 and has a predetermined width. The heat dissipation member 112 is formed along the second direction (X) of the heat dissipation body 111 and is arranged in the first direction (Y). And the upper surface of the heat dissipation member 112 are all located on the same plane. The position of the top surface of the heat dissipation member 112 is not limited and may be variously changed according to the design of the headlamp.

In addition, the heat dissipation member 112 may be formed along the first direction Y as shown in FIG. 6 and arranged in the second direction X.

In addition, the heat dissipation member 112 may protrude in the form of a bar having a predetermined length, as shown in FIG. 7. At this time, the heat dissipation member 112 is arranged in the first direction (Y) and the second direction (X).

Although not shown in the drawing, the heat dissipation member 112 may be a protrusion protruding in a hemisphere form from the surface of the heat dissipation body 111.

On the other hand, the heat dissipation unit 11, the heat dissipation body 111 is omitted, may include only the heat dissipation member 112. In this case, the heat dissipation member 112 protrudes from the outer circumference of the housing 20. Accordingly, the heat radiating member 112 may be integrally formed with the housing 20. The heat dissipation member 112 is formed in a plate or bar shape and may be arranged in a first direction (Y) or a second direction (X). However, it may be arranged simultaneously in the first direction (Y) and the second direction (X).

In FIG. 1, the heat dissipation unit 11 is illustrated as being disposed on the outer circumferential upper surface of the housing 20, but the heat dissipation unit 11 may be disposed on the left, right, or lower surfaces of the housing 20. However, the heat dissipation unit 11 may be entirely disposed along the outer circumference of the housing 20.

The heat conduction unit 12 includes a fixed body 121 and a rib 122, and is located inside the housing 20 to transfer heat generated from the reflector 40 by the lamp module 50 to the outside of the housing 20 do.

The fixed body 121 is inserted into the housing 20 in a fitting manner to contact the insertion preventing protrusion 22. When the fixing body 121 is caught by the insertion device projection 22, the heat conduction unit 12 is no longer inserted into the housing 20.

The fixed body 121 is inserted into the housing 20 and is positioned between the outer circumference of the reflector 40 and the inner circumference of the housing 20. The fixed body 121 is separated from the reflector 40 and is in contact with the housing 20. The fixed body 121 and the housing 20 are in surface contact.

On the other hand, if the outer circumference of the fixed body 121 is not in contact with the inner circumference of the housing 20, a plurality of brackets (not shown) for fixing the fixed body 121 may be formed inside the housing 20. have. In FIG. 3, the shape of the fixed body 121 is shown in a square shape, but the shape of the fixed body 121 may be variously changed according to the shape of the reflector 40.

The rib 122 protrudes from the inside of the fixed body 121 toward the inner center. The thickness of the rib 122 is thinner than the thickness of the fixed body 121 and may bend when an external force is applied. Accordingly, when the reflector 40 is inserted into the fixed body 121, the rib 122 may be bent while touching the curved surface of the outer circumference of the reflector 40. Accordingly, the rib 122 may elastically contact the outer circumference of the reflector 40 to elastically contact the line. The reflector 40 can be fixed to the inside of the fixed body 121 by the rib 122 in line contact, and even if the reflector 40 moves by the elastic line contact, the rib 122 is always in contact with the reflector 40 It can maintain the contact state and is not obstructed by the movement of the reflector 40.

On the other hand, since the ribs 122 that are in line contact with each side of the reflector 40 are located, the reflector 40 can be stably fixed inside the fixing body 121.

In FIG. 3, four ribs 122 are illustrated, but the number of ribs 122 may vary according to the specifications of the headlamp.

The heat-conducting portion 12, the heat-radiating portion 11, and the housing 20 may be made of an injection molding pellet comprising a polymer matrix and a polymer coated ceramic powder dispersed in the matrix, respectively. However, the heat-conducting portion 12 and the heat-radiating portion 11 may be made of metal having excellent heat conductivity.

As the polymer matrix, a thermoplastic resin or a heat curable resin that can be applied when manufacturing pellets for injection molding may be applied, for example, polybutylene terephthalate (PBT), polycarbonate, PC), polypropylene (polypropylene, PP), ABS (Acrylonitrile Butadiene Styrene) resin, polymethyl methacrylate [Poly (methyl methacrylate), PMMA], and combinations thereof.

When the pellets for injection molding are manufactured by applying only the polymer matrix, the heat dissipation properties are significantly deteriorated due to the low thermal conductivity of the thermoplastic resin or the thermosetting resin. However, when applied to the heat conduction portion 12, the heat dissipation portion 11, and the housing 20, which are large parts of the temperature change of the head lamp, since the heat dissipation properties are very important, they are made of only a thermoplastic resin or a heat curable resin. Old plastic is difficult to use.

In addition, plastic parts that require heat dissipation properties, such as headlamps, must have heat dissipation properties and electrical nonconductor properties. Therefore, in order to improve thermal conductivity, ceramic types other than electrically conductive metals have been mixed with a polymer matrix and attempted to be applied to injection molding. It was difficult to apply to corner structures or complex structures.

In order to solve this problem, in the present invention, a polymer coated ceramic powder is applied. The polymer coated ceramic powder includes a polymer coating layer and spherical ceramic particles or agglomerates thereof located inside the polymer coating layer.

At this time, the spherical ceramic particles are applied to a spherical shape, the meaning of a spherical shape means an overall round shape, and excludes an angular shape such as a plate shape, and does not mean a perfect spherical shape, but an oval shape or a part thereof is distorted. Also includes spherical form.

Spherical ceramic particles are applied in the form of a core-shell structure wrapped by a polymer coating layer in a state in which agglomerates are formed by agglomeration of several spherical ceramic particles. Even when the spherical ceramic particles themselves are used by dispersing in the polymer matrix, even the spherical ceramic particles may damage the screw of the injection machine during injection molding somewhat. In order to solve this problem, a thin polymer coating layer was formed on the spherical ceramic particles or agglomerates of spherical ceramic particles and applied to the polymer matrix above. Can be improved.

The polymer coating layer is formed by applying a polymer for preparing the coating layer, specifically polyethylene glycol, polyvinyl acetate, polyethylene oxide, polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, polyacrylic acid, polyphosphoric acid, polyethylene sulfonic acid, polyamine , Polyurethane, carboxy methyl cellulose, polyoxyalkylene glycol, and any one selected from the group consisting of a combination thereof.

The spherical ceramic particles may include any one selected from the group consisting of alumina, aluminum nitride, silica, titanium oxide, zirconia, and combinations thereof.

It is preferable that the spherical ceramic particles have an average particle diameter of 0.1 to 30 μm, and it is suitable to apply those having an average particle diameter to the injection molding process.

As the spherical ceramic particles, one having one particle diameter may be applied, but it is better to improve the heat dissipation property by mixing and applying two or three different particle diameters. At this time, spherical ceramic particles having different particle sizes from each other may be applied to a mixture of first particles having an average particle diameter of 15 to 30 μm, second particles having an average particle diameter of 7 to 13 μm, and third particles having 3 to 6 μm. Specifically, a mixture of first particles having an average particle diameter of 22 to 28 μm, second particles having an average particle diameter of 8 to 12 μm, and third particles having 4 to 6 μm may be applied, and more specifically, the spherical As the ceramic particles, a mixture of first particles having an average particle diameter of 24 to 26 μm, second particles having an average particle diameter of 9 to 11 μm, and third particles having 4.5 to 5.5 μm may be mixed.

The ratio of the first particle, the second particle, and the third particle to be mixed is specifically, based on 1 part by weight of the first particle, the second particle is 0.5 to 1.5 parts by weight, and the third particle is included in 8 to 12 parts by weight It is good, more specifically, based on 1 part by weight of the first particle, the second particle is preferably contained in 0.7 to 1.3 parts by weight, the third particle is 9 to 11 parts by weight. When mixed and applied in such a ratio, the heat dissipation characteristics of the heat conduction unit 12, the heat dissipation unit 11, and the housing 20 may be further improved, and heat dissipation properties may also be improved.

The polymer matrix and the polymer-coated ceramic powder dispersed in the matrix are for injection molding each forming a heat-conducting portion 12, a heat-radiating portion 11, and a housing 20 at a ratio of 3 to 50% by weight and 50 to 97% by weight, respectively. Can be included in the pellet. When the polymer-coated ceramic powder is applied in an amount of less than 50% by weight, the overall heat transfer coefficient may be lowered and the heat dissipation effect may not be sufficient, and when it exceeds 97% by weight, the binding force by the matrix is lowered and the pellet is made of injection molding pellets. The heat-conducting portion 12, the heat-radiating portion 11, and the housing 20 may be difficult to have sufficient strength. When the content of the polymer matrix is less than 3% by weight, the strength of the heat-conducting portion 12, the heat-radiating portion 11, and the housing 20 made of pellets for injection molding may be deteriorated because the bonding strength is weak, and the content of the polymer matrix exceeds 50% by weight. In some cases, the heat dissipation effect may not be sufficient.

The polymer matrix and the polymer coated ceramic powder dispersed in the matrix may be included in pellets for injection molding at a ratio of 10 to 30% by weight and 70 to 90% by weight, respectively. In this case, pellets for injection molding having sufficient heat dissipation and an appropriate level or higher strength can be produced. Accordingly, the heat-conducting portion 12, the heat-radiating portion 11, and the housing 20 made of injection molding pellets can exhibit strengths of an appropriate level or higher.

The polymer coating layer included in the polymer coating ceramic powder may be applied in 0.5 to 5 parts by weight based on 100 parts by weight of the ceramic powder, and may be applied in 0.6 to 4 parts by weight, and may be applied in 1 to 2 parts by weight. If the polymer coating layer is prepared by preparing a polymer for preparing a coating layer at a ratio of such a content, it is possible to sufficiently obtain an effect that sufficient injection machine is not damaged during the injection process.

When the polymer coating layer is applied in an amount of less than 0.5 parts by weight based on 100 parts by weight of the polymer coated ceramic powder, the coating may not be sufficiently made on the spherical ceramic particles, and when it is included in more than 5 parts by weight, the thermoplasticity or heat included in the polymer matrix The physical properties of the curable resin may be deteriorated.

The polymer coating layer may be prepared by a spray drying method described below.

The polymer coating layer may be changed to a phosphoric acid coating layer and applied. The phosphoric acid-based coating layer is to induce chemical bonding between the ceramic surface and the phosphoric acid-based coating material, and a method of impregnation, washing and drying may be applied, not a scrap dry method.

The pellets for injection molding according to another embodiment of the present invention are prepared by mixing a spherical ceramic particle having an average particle diameter of 0.1 to 30 μm and a polymer for preparing a coating layer together with a solvent to prepare a mixed slurry, and drying the mixed slurry. Dry step of preparing a polymer coated ceramic powder, liquid mixing step and mixed ceramic polymer to prepare a liquid mixed ceramic polymer by mixing 3 to 50 parts by weight of the polymer for forming a molten matrix with 50 to 97 parts by weight of the polymer coated ceramic powder It includes a product forming step of manufacturing each of the heat-conducting unit 12, the heat-radiating unit 11, and the housing 20 by molding with an injection molding machine.

The description of each of the spherical ceramic particles, the polymer for forming the coating layer, and the polymer for forming the matrix, and the application rate thereof, overlaps with the above description, so that description is omitted. In addition, the spherical ceramic particles are the same as those mentioned above for mixing the first particles having an average particle diameter of 15 to 30 μm, the second particles having an average particle diameter of 7 to 13 μm, and the third particles having 3 to 6 μm.

The slurry production step may be performed by a ball milling method. When the ball milling method is applied, even when a small amount of the coating layer manufacturing polymer is applied, it is sufficiently mixed with the spherical ceramic particles so that spherical ceramic particles having different particle diameters form an agglomerate properly and a sufficient coating layer is formed thereon.

As the polymer for coating layer production, a polymer applied to the above-mentioned polymer coating layer may be applied, and the solvent may be selected by appropriately selecting a solvent suitable for the polymer. For example, in order to form a polymer coating layer by applying polyethylene glycol, polyvinyl acetate, etc. as a collimator for preparing a coating layer, water may be applied as a solvent.

In the case of applying the polymer for forming the coating layer, the coating layer is formed by applying a spray drying method rather than applying a general drying method, thereby forming a relatively even coating layer on the surface of the particle and obtaining coated particles having a small particle size. Is good at

Specifically, in the spray drying method, when the incoming slurry (a slurry in which a polymer for coating layer production and spherical ceramic particles are uniformly mixed) touches a rotating disk, it is dispersed in a spray dryer by centrifugal force, and the atmosphere in the spray dryer is 100 It is maintained at a temperature of 200 ° C., so that the solvent is quickly removed and the coating layer is stably formed on the spherical ceramic particles. The atmosphere is better, the inlet temperature may be 160 to 190 ° C, the outlet temperature may be 100 to 130 ° C, and under these conditions, well dried polymer coated spherical ceramic particles can be efficiently obtained. In addition, the disk rotation of the spray dry may be 6000 to 12000 rpm, and may be 8000 to 10000 rpm. When such a disk rotational speed is applied, a sufficiently small polymer coated spherical ceramic particle can be efficiently produced.

The polymer for forming the melted matrix is applied after melting a thermoplastic resin or a thermosetting resin by a conventional method, for example, melted at a temperature of 5 to 30 ° C. higher than the melting point of the thermoplastic resin or the thermosetting resin. Polymers can be applied.

The thermoplastic resin or heat curable resin for forming the molten matrix is mixed with a polymer coating ceramic powder to become a mixed ceramic polymer in the form of a liquid or slurry, and the mixed ceramic polymer is introduced into an injection machine, the heat conduction unit 12, heat dissipation The part 11 and the housing 20 are each manufactured.

The pellets for injection molding manufactured in this way include a sufficient amount of ceramics to provide excellent heat dissipation properties 12, heat dissipation parts 11, and housings 20, yet excellent flowability, workability, mobility, etc. And, while applying the ceramic, the injection molding process can proceed without damaging the injection machine itself.

[Production of ceramic powder coated with polymer]

Three types of spherical alumina having a particle size of 25, 10, and 5 μm, respectively, were added to the mixer in 1, 1, and 8 parts by weight, respectively, and mixed to prepare a mixed ceramic. 10 parts by weight of the mixed ceramic mixed as described above were mixed for about 6 hours by a method of 10 parts by weight of water as a solvent, 0.125 parts by weight of PEG / PVA as an aqueous polymer for coating, and a ball mill, and a mixed slurry was prepared.

The mixed slurry at room temperature was placed in a spray-drying device, and coated ceramic granules were prepared. At this time, the disk rotational speed of the spray drying apparatus was applied at 9000 rpm, and the inlet temperature and outlet temperature were applied at 180 ° C and 110 ° C, respectively. The coated ceramic granules produced were powders in the form of one or several aggregates of spherical alumina coated with the above polymer.

The coated ceramic granules thus prepared were collected and the size of the particles was checked using a particle size analyzer. The minimum particle size of the coated ceramic granules was 0.233 μm, and the maximum size was measured to be 24.133 μm, and the median particle size was 1.311 μm. In addition, about 70% of the coated ceramic granules were distributed within a particle size range of 0.233 to 4.050 μm.

[Preparation of pellets for injection molding using coated ceramic powder]

A liquid polymer was prepared by heating 80 parts by weight of PBT above the melting point. The liquid polymer was mixed with 20 parts by weight of the coated ceramic powder (coated ceramic granules) prepared above, and molded using an injection molding machine to produce a heat conducting part 12, a heat dissipating part 11, and a housing 20. .

Therefore, since the heat sink 11 and the reflector 40 where the lamp module 50 is located are connected through a heat conduction unit, heat generated in the reflector 40 by the lamp module is radiated through the heat conduction unit 12. It can conduct quickly and dissipate heat. Accordingly, it is possible to prevent deterioration of the substrate or reflector due to heat.

For reference, in the above description and drawings, the reflector heat dissipation device of the present invention has been described as being installed on the headlamp, but the field of application of the reflector heat dissipation device of the present invention is not limited to this, and can be applied to any area that generally needs to emit heat. have.

Therefore, the scope of rights of the reflector heat dissipation device of the present invention is not limited to that applied to the head lamp, and should be interpreted as meaning that it applies to dissipating heat generated by a lamp module or the like.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1: Head lamp 10: Heat sink
11: heat dissipation unit 111: heat dissipation body
112: heat dissipation member 12: heat conduction unit
121: fixed body 122: rib
20: housing 21: hole
30: cover 40: reflector
41: through hole 50: lamp module
51: stopper

Claims (13)

Heat dissipation located outside the reflector, and
A heat conduction unit connecting the reflector and the heat dissipation unit
It includes,
The heat conduction unit,
A fixed body positioned outside the reflector and spaced apart from the reflector, and
A plurality of ribs protruding from the fixed body and contacting the reflector, and fixing the reflector inside the fixed body
It includes,
The plurality of ribs have elasticity, and elastically contact the outer side of the reflector.
Reflector heat sink. delete In claim 1,
The plurality of ribs, respectively, the reflector heat dissipation device in line contact with the outer surface of the reflector. In claim 1,
The heat dissipation unit,
The heat dissipation body in contact with the outside of the housing to which the fixed body is fixed, and
A plurality of heat radiation members protruding from the heat radiation body and spaced apart from each other
Containing
Reflector heat sink. In claim 1,
The heat-conducting portion and the heat-radiating portion, respectively,
3 to 50% by weight of the polymer matrix, and
50 to 97% by weight of polymer coated ceramic powder dispersed in the matrix
Including,
The polymer-coated ceramic powder is wrapped by a polymer coating layer in a state in which spherical ceramic particles are aggregated to form an agglomerate to form a core-shell structure,
The spherical ceramic particles have an average particle diameter of 0.1 to 30 μm
Reflector heat sink. In claim 5,
The spherical ceramic particles, the first particle having an average particle diameter of 15 to 30 μm, a second particle having an average particle diameter of 7 to 13 μm, and a third particle having a 3 to 6 μm reflector heat dissipation device. In claim 1,
The heat-conducting portion and the heat-radiating portion are metal reflector radiator. Housing with open front,
The housing is disposed on the front cover,
A reflector disposed inside the housing,
Lamp module disposed on the reflector and
Reflector heat dissipation device defined in any one of claims 1, 3 to 7
It includes,
The radiator of the reflector heat dissipation device is located outside the housing, and the heat conduction part of the reflector heat dissipation device is located between the reflector and the housing.
Head lamp. In claim 8,
The housing,
3 to 50% by weight of the polymer matrix, and
50 to 97% by weight of polymer coated ceramic powder dispersed in the matrix
Including,
The polymer-coated ceramic powder is wrapped by a polymer coating layer in a state in which spherical ceramic particles are aggregated to form an agglomerate to form a core-shell structure,
The spherical ceramic particles have an average particle diameter of 0.1 to 30 μm
Head lamp. In claim 9,
The polymer coating layer,
Polyethylene glycol, polyvinyl acetate, polyethylene oxide, polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, polyacrylic acid, polyphosphoric acid, polyethylene sulfonic acid, polyamine, polyurethane, carboxy methyl cellulose, polyoxyalkylene glycol, And combinations thereof.
Head lamp. In claim 9,
The spherical ceramic particles, the first particle having an average particle diameter of 15 to 30 μm, a second particle having an average particle diameter of 7 to 13 μm, and a headlamp having a mixture of 3 to 6 μm third particles. In claim 11,
Based on 1 part by weight of the first particles, the second particles are 0.5 to 1.5 parts by weight, and the third particles are 8 to 12 parts by weight. In claim 9,
The polymer matrix,
Polybutylene tetraphthalate, polycarbonate, polypropylene, ABS (Acrylonitrile Butadiene Styrene) resin, polymethyl methacrylate, and any one selected from the group consisting of a headlamp.

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