KR102497803B1 - A lighting apparatus for a car - Google Patents

Abstract

A lighting device for a vehicle is provided. A lighting device for a vehicle according to an exemplary embodiment of the present invention includes a light source unit including at least one LED mounted on one surface of a circuit board; a metal plate for dispersing and dissipating the heat generated from the light source unit to the outside; and a supporter supporting the metal plate to maintain the shape of the metal plate, wherein one surface of the circuit board is directly attached to one surface of the metal plate via an adhesive layer.

Description

Vehicle lighting apparatus using heat-dissipating plastic {A lighting apparatus for a car}

The present invention relates to a lighting device for a vehicle, and more particularly, to a lighting device for a vehicle using a heat-dissipating plastic.

Lighting devices for vehicles can be largely classified into lighting lamps, traffic lights, and indicators. It is stipulated that such a lighting device can only be used that satisfies related laws and regulations. In other words, it is stipulated that only type-approved products can be installed, that they must be installed in accordance with laws and regulations, and that performance is always maintained within the permissible range.

On the other hand, the lighting device for a vehicle uses an LED capable of realizing high luminance while using low power as a light source.

Since such an LED generates a lot of heat during operation, when heat dissipation is not performed smoothly, there is a problem in that a useful life is reduced.

Accordingly, there is an urgent need for a countermeasure for preventing the shortening of the useful life of the LED due to heat by rapidly dissipating the heat generated from the LED.

KR 10-0961104 B1

The present invention has been devised in consideration of the above points, and an object of the present invention is to provide a lighting device for a vehicle capable of quickly dispersing heat generated from an LED and increasing heat dissipation.

In order to solve the above problems, the present invention is a light source unit including at least one LED mounted on one surface of a circuit board; a metal plate for dispersing and dissipating the heat generated from the light source unit to the outside; and a supporter supporting the metal plate to maintain the shape of the metal plate, wherein one surface of the circuit board is directly attached to one surface of the metal plate via an adhesive layer.

In addition, the metal plate may include a plate-shaped horizontal portion to which the circuit board is attached and at least one leg portion extending in one direction from an edge of the horizontal portion, and the support body is made of a plastic material having heat dissipation properties and is connected to the metal plate. It can be integrated through insert injection molding.

In addition, the vehicle lighting device may include a plurality of terminal pins integrally formed with the support body for electrical connection with the circuit board, and one end of the plurality of terminal pins protrudes outward from the metal plate. can

In addition, a heat dissipation coating layer is formed on the exposed surface of the metal plate to increase heat dissipation.

According to the present invention, since the circuit board on which the LEDs are mounted is directly attached to the metal plate, heat generated from the LEDs can be rapidly dispersed and heat dissipation performance can be improved. Accordingly, it is possible to prevent the use life of the LED from being reduced due to heat.

1 is a view showing a lighting device for a vehicle according to an embodiment of the present invention;
Figure 2 is a view of Figure 1 viewed from the bottom,
3 is a view showing a state in which the light source unit, the metal plate, and the support are forcibly separated in FIG. 1;
Figure 4 is a cross-sectional view in the direction AA of Figure 1;
5 is a cross-sectional view in the direction BB of FIG. 1;
6 is a schematic diagram showing the detailed configuration of a support body applied to a lighting device for a vehicle according to the present invention;
7 is a schematic diagram showing a graphite composite that can be applied to the support of the present invention, where (a) is composed of graphite, nanometal, and catecholamine, and (b) is composed of graphite, nanometal, catecholamine, and polymer. ,
8 is a view showing a form in which supports are disposed on both sides of a metal plate in a lighting device for a vehicle according to an embodiment of the present invention, and
9 is a view showing a location of a vehicle to which a vehicle lighting device according to an embodiment of the present invention can be applied.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein. In order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar components throughout the specification.

The vehicle lighting device 100 according to an embodiment of the present invention may be installed in a vehicle to serve as a lighting lamp, a traffic lamp, and a lamp. That is, as shown in FIG. 9 , the vehicle lighting device 100 may be applied to the vehicle's headlamps 12, side mirror display lamps 16, tail lamps 14, and the like. Through this, it is possible to secure the driver's front view, display the turning direction of the vehicle, or perform the role of an indicator light notifying the vehicle behind of the brake operation.

As shown in FIGS. 1 to 4 , the lighting device 100 for a vehicle according to an embodiment of the present invention includes a light source unit 110 , a metal plate 120 and a support body 130 .

The light source unit 110 generates light when power is supplied from the outside, thereby securing a driver's forward vision, displaying a turning direction of the vehicle, or serving as an indicator light notifying a vehicle behind of a brake operation.

To this end, the light source unit 110 may include at least one LED 112 and a circuit board 114 as shown in FIGS. 1 and 2 . For example, the light source unit 110 may be a COB type in which a plurality of LEDs 112 are wire-bonded to the circuit board 114, but is not limited thereto, and all known LED types may be applied.

As shown in FIG. 4 , the light source unit 110 may be attached to one surface of the circuit board 114 and one surface of the metal plate 120 through an adhesive layer 116 . In this case, the adhesive layer 116 may include a thermally conductive component. For example, the adhesive layer 116 may be a known thermally conductive adhesive.

In addition, the circuit board 114 may be a thermally conductive substrate. For example, the circuit board 114 may be a known metal board or a ceramic board.

Accordingly, heat generated from the LED 112 may be smoothly transferred to the metal plate 120 through the adhesive layer 116 .

Meanwhile, as shown in FIGS. 3 and 4 , at least one fastening hole 115 may be formed through the circuit board 114 so as to be electrically connected to power supplied from the outside. Such a fastening hole 115 may be formed in an area corresponding to a terminal pin 140 described later, and power supplied from the outside may be supplied to the LED 112 side by inserting the terminal pin 140. .

At this time, as shown in FIG. 5, a short circuit prevention member 118 made of an insulating material may be inserted into the fastening hole 115, and the terminal pin 140 may prevent an electrical short. It may be inserted into the short-prevention member 118 side.

In the short circuit prevention member 118, when the circuit board 114 is made of a metal substrate, the terminal pin 140 inserted into the fastening hole 115 is a metal part constituting the inner wall of the fastening hole 115. It can be prevented from being in direct contact with and being energized.

The metal plate 120 can quickly dissipate heat generated from the LED 112 and release it to the outside. For example, the metal plate 120 may be Cu, Al, or an alloy including any one of Cu and Al, but is not limited thereto, and all known metal materials may be used.

As shown in FIGS. 1 and 3 , the metal plate 120 may include a plate-shaped horizontal portion 122 to which the circuit board 114 of the light source unit 110 is attached, and the horizontal portion 122 ) may include at least one leg part 124 extending in one direction from the rim of the horizontal part 122 so as to quickly disperse the heat transferred to it.

For example, the leg portion 124 may be bent from an edge of the horizontal portion 122 and may be provided in plural to increase the total area. Accordingly, the heat transfer area of the metal plate 120 is increased through the leg portion 124, thereby increasing the overall heat capacity, and the total area of the metal plate 120 is increased by an area corresponding to the leg portion 124, thereby transferring heat. After it is rapidly dispersed, it can be released to the outside.

In this way, in the vehicle lighting device 100 according to an embodiment of the present invention, the circuit board 114 on which the LED 112 is mounted is directly fixed to the metal plate 120 via the adhesive layer 116, The heat generated in (112) can be quickly released. Through this, it is possible to prevent a decrease in life of the LED 112 due to heat and to prevent damage to components caused by heat in advance.

The support 130 may maintain the shape of the metal plate 120 by being provided on at least one surface of the metal plate 120 . For example, the support 130 may be made of a plastic material made of a polymer resin, and may be disposed to cover at least one surface of the metal plate 120 .

That is, the support 130 may be provided only on the inner surface of the metal plate 120 surrounded by the horizontal portion 122 and the leg portion 124 as shown in FIGS. 1 to 4, and FIG. 8 As shown in , it may be provided to cover both sides of the metal plate 120 .

At this time, the support 130 may be coupled to the metal plate 120 through a corresponding fastening means, but may be integrally formed with the support 130 .

For example, the support 130 may be integrated with the metal plate 120 through insert molding. That is, the support 130 may be integrated with the metal plate 120 through insert molding in a state in which the light source unit 110 is attached to one surface of the horizontal portion 122 .

In this case, at least one through hole 126 may be formed through the metal plate 120 so as to increase bonding force with the support 130 . That is, as shown in FIG. 4 , the through hole 126 is formed by filling the through hole 126 with the support forming composition constituting the support 130 during insert injection molding, so that the support 130 is a metal plate ( 120) can be prevented from peeling off.

Through this, the light source unit 110 can maintain a state directly attached to one surface of the metal plate 120 via the adhesive layer 116, and the metal plate 120 and the support 130 can be integrated. .

Due to this, heat generated in the light source unit 110 can be directly transferred to the side of the metal plate 120, and a separate assembly process for fastening the metal plate 120 and the support 130 can be omitted. .

In addition, even if the metal plate 120 is formed with a thin thickness or made of a metal material having ductility, it can be supported through the integrated support 130 to maintain a predetermined shape.

For this reason, even though the vehicle lighting device 100 includes the metal plate 120 made of a metal material that is relatively heavy compared to plastic material, the metal plate 120 is implemented with a thin thickness to reduce the amount of metal plate 120 used. By doing so, weight reduction can be realized. In addition, since the metal plate 120 may be configured to have a thin thickness, the thermal conductivity of the metal plate 120 may be increased and the heat transferred from the LED 112 may be more rapidly dispersed.

Through this, the lighting device 100 for a vehicle according to the present invention can realize light weight while ensuring heat dissipation.

At this time, the support body 130 may be provided with a plurality of terminal pins 140 for electrical connection with the light source unit 110, and the plurality of terminal pins 140 perform insert molding with the support body 130. It may be in an integrated form through

The plurality of terminal pins 140 may be buried in the support 130 such that both ends thereof are exposed to the outside by a predetermined length. At this time, one end of both ends of the plurality of terminal pins 140 may protrude outward from a portion to which the circuit board 114 is attached among the metal plates 120 integrated with the support 130, and the other end may protrude to the outside of the support 130.

In this case, as shown in FIG. 3, the metal plate 120 has an opening 128 formed through a predetermined area to prevent contact with the terminal pin 140 on the horizontal portion 122 side of the metal plate 120. The circuit board 114 may be disposed on the horizontal portion 122 of the metal plate 120 such that the fastening hole 115 is positioned directly above the opening 128 .

Accordingly, either end of the plurality of terminal pins 140 passes through the opening 128 and is inserted into the fastening hole 115 side of the circuit board 114, thereby connecting the circuit board 114 and the terminal pin 140 with each other. It can be electrically connected, and the remaining end protrudes to the outside of the support body 130 so that it is connected to a connector for electrical connection and can receive power from the outside.

Here, as shown in FIG. 2, one surface of the support body 130 may be provided with a connector connection portion 134 protruding to surround the plurality of terminal pins 140 protruding outward from the support body 130. . In such a connector connection part 134, the plurality of terminal pins 140 and the connector can be stably connected as the connector is coupled and fixed.

Meanwhile, the support 130 may be made of a plastic material having heat dissipation properties so as to more effectively dissipate heat transferred from the light source unit 110 toward the metal plate 120 .

For example, the support 130 may be formed by injection molding of a composition for forming a heat dissipation member including a thermosetting polymer resin having heat dissipation properties, and the support 130 may be formed by insert injection molding as described above to form the metal plate. (120) and can be integrated.

That is, in the vehicle lighting device 100 according to an embodiment of the present invention, the composition for forming a heat dissipating member covers one or both surfaces of the metal plate 120 through insert injection molding, and then is cured to form the support 130. By being implemented, the metal plate 120 and the support 130 may be configured in an integrated form.

On the other hand, the composition for forming a heat dissipating member constituting the support 130 may include a graphite composite (A, A') and a polymer resin (B) as shown in FIG. 6 .

For example, the graphite composite (A, A') may be formed of a composite in which the nanometal particles (A2) are bonded to the surface of the plate-shaped graphite (A1) (see (a) (b) of FIG. 7).

Here, the specific bonding method of the graphite (A1) and the nanometal particle (A2), the content of the graphite (A1) and the nanometal particle (A2), and the type of the nanometal particle may be appropriately selected according to design conditions.

However, preferably, the nanometal particles (A2) may be a conductive metal to exhibit an electromagnetic wave shielding effect. For example, the nanometal particle (A2) may include one or more selected from the group consisting of Ni, Si, Ti, Cr, Mn, Fe, Co, Cu, Sn, In, Pt, Au, and Mg. there is.

Meanwhile, the polymer resin (B) may include at least one of a thermosetting resin and a thermoplastic resin, and the thermosetting resin is at least one selected from the group consisting of an epoxy-based resin, a urethane-based resin, a melamine-based resin, and a polyimide-based resin. The thermoplastic resin may include a polycarbonate-based resin, a polystyrene-based resin, a polysulfone-based resin, a polyvinyl chloride-based resin, a polyether-based resin, a polyacrylate-based resin, a polyester-based resin, or a polyamide-based resin. , It may include at least one selected from the group consisting of cellulose-based resins, polyolefin-based resins and polypropylene-based resins.

Such a graphite composite (A, A') may be prepared by various methods.

For example, the graphite composites (A, A′) may be prepared by mixing plate-shaped graphite (A1) and nanometal particles (A2). At this time, the mixing ratio of the nano-metal particles (A2) and the plate-shaped graphite (A1) may be arbitrarily set according to the purpose of use.

Then, plasma is applied to the graphite composite (A, A') to vaporize the nano-metal particle (A2). Thereafter, a quenching gas is injected into the vaporized nanometal particle A2 to condense or rapidly cool the vaporized nanometal particle A2. Accordingly, the growth of the vaporized nano-metal particles (A2) is suppressed, and the graphite particle complexes (A, A') in which the nano-metal particles (A2) are crystallized are formed on the surface of the graphite (A1).

Here, the nanometal particles (A2) included in the graphite composites (A, A') must be present at a high density on the surface of the plate-shaped graphite (A1), so they are contained in an amount of 20 to 50 wt% based on the total weight of the graphite (A1). and may be bonded to the surface of graphite (A1) in the form of crystals having an average particle diameter of 10 to 200 nm. In addition, it may have a surface area range of 30 to 70 area% with respect to the cross section of the graphite composite (A, A').

At this time, in the heat dissipation member-forming composition, the graphite composites (A, A') may form a dispersed phase in the polymer resin (B) (see FIG. 6).

To this end, the graphite composite (A, A') may include a catecholamine layer (A3) on the nanometal particle (A2) (see (a) (b) of FIG. 7).

This is because the plate-shaped graphite (A1) on which the nano-metal particles (A2) are crystallized is coated with catecholamine, such as polydopamine, to modify the surface, thereby reducing the properties of the plate-shaped graphite itself. This is because strong interfacial bonding with a polymer resin can be enhanced by using strong adhesive properties.

In addition, when the nanometal particles (A2) are coated with the catecholamine layer (A3), the dispersibility in the organic solvent is improved, so when the organic solvent is included in the composition for forming the heat dissipating member, the graphite composite (A, A') is a polymer It can be uniformly dispersed in the resin (B).

Accordingly, by preferentially preparing a graphite composite (A, A′) including graphite-nanometal particles-catecholamines, a composite material having significantly improved dispersibility in a desired polymer resin can be manufactured.

Here, the "catecholamine" is a term meaning a single molecule having a hydroxyl group (-OH) as an ortho-group of a benzene ring and various alkylamines as a para-group. The various derivatives of the structure are dopamine, dopamine-quinone, alpha-methyldopamine, norepinephrine, epinephrine, alpha-methyldopa, droxidopa ), indolamine, serotonin, or 5-hydroxydopamine are included in catecholamines. Most preferably dopamine may be used.

In general, it is difficult to coat the catecholamine layer on the surface of pure plate-shaped graphite, but in the graphite composite (A, A') according to the present invention, the nano-metal particles (A2) crystallized on the surface form a high-density bond, so that the crystallized nano A catecholamine layer (A3) may be stably formed by binding a catecholamine compound such as polydopamine to the metal particle (A2).

When such a catecholamine layer is composed of dopamine, the catecholamine layer may be formed by dipping the graphite complex (A, A′) in an aqueous solution of dopamine. At this time, when the basic dopamine aqueous solution is used as the dopamine aqueous solution, dopamine spontaneously reacts under oxidizing conditions and is polymerized on the nanometal particles A2 of the graphite composites (A, A') to form a polydopamine layer. Therefore, a separate firing process is not required, and the addition of an oxidizing agent is not particularly limited, but oxygen gas in the air can be used as an oxidizing agent without adding an oxidizing agent.

Here, the thickness of the polydopamine layer is determined by the dipping time. Accordingly, in the case of using an aqueous dopamine solution prepared by dissolving dopamine in a basic Tris buffer solution having a pH of 8 to 14 so that the dopamine concentration is 0.1 to 5 mg/mL, in order to form a polydopamine layer with a thickness of 5 to 100 nm, about 0.5 to 5 mg/mL of dopamine is used. It is preferable to dip the plate-shaped graphite to which the nanometal particles (A2) are bonded to the surface for 24 hours.

As such, since the graphite composites (A, A') constituting the composition for forming a heat dissipating member according to the present invention are in a state in which the nanometal particles (A2) are bonded to the surface of the graphite, the catecholamine layer is formed by the nanometal particles (A2) It can be.

Accordingly, since the interface properties between the polymer resin (B) and the graphite composite (A, A') are improved through the catecholamine layer, it may be possible to manufacture a sheet form even if a small amount of the polymer resin is included.

Meanwhile, the graphite composite (A′) may include the polymer (A4) bonded to the catecholamine layer (A3) (see (b) of FIG. 7). For example, the polymer (A4) may be bonded to the catecholamine layer by adding the graphite composite (A) coated with the nanometal particles (A2) with the catecholamine to a polymer resin solution.

Here, the polymer (A4) may be formed to completely cover the catecholamine layer (A3), or the polymer (A4) may be bonded to the catecholamine layer (A3) in the form of particles, and the surface of the graphite composite (A) It may be formed to completely cover.

In addition, the type of the polymer (A4) is not particularly limited, but may be selected from the group consisting of thermosetting resins, thermoplastic resins, and rubbers. At this time, the type of the polymer (A4) is not particularly limited as long as it has reactivity and harmony with the polymer resin (B) constituting the heat dissipating member-forming composition, but is preferably the same as the type of the polymer resin (B). Similar types of polymers may be used.

Through this, a graphite composite (A′) including graphite (A1), nanometal particles (A2), a catecholamine layer (A3), and a polymer (A4) is primarily prepared, and then it is placed in the desired polymer resin (B). When dispersed, the graphite composite (A′) can be very homogeneously and evenly dispersed in the polymer resin (B) (see FIG. 6).

That is, since the graphite composite (A') contains the polymer (A4) on the surface, not only the low dispersibility and agglomeration of graphite itself, but also the aggregation phenomenon due to the high adhesiveness of the catecholamine layer itself does not occur, so uniform dispersion in the polymer resin will be able to achieve Accordingly, excellent heat dissipation performance may be obtained by increasing the overall content of the graphite composite (A′) in forming the heat dissipation member-forming composition.

On the other hand, the composition for forming a heat dissipation member is a leveling agent, a pH adjusting agent, an ion trapping agent, a viscosity adjusting agent, a thixotropy imparting agent, an antioxidant, a heat stabilizer, a light stabilizer, a UV absorber, and a colorant in addition to an organic solvent. One or two or more of various additives such as a dehydrating agent, a flame retardant, an antistatic agent, an antiseptic agent, and a preservative may be added. The various additives described above may be those known in the art and are not particularly limited in the present invention.

In addition, the catecholamine layer (A3) may further include a solvent. Depending on the selected adhesive component, a suitable solvent can be selected, and the present invention is not particularly limited thereto. As the solvent, any solvent capable of properly dissolving each component can be used. At least one selected from the group consisting of water-based solvents, alcohol-based solvents, ketone-based solvents, amine-based solvents, amine-based solvents, ester-based solvents, amide-based solvents, halogenated hydrocarbon-based solvents, ether-based solvents and furan-based solvents may be used. there is.

On the other hand, when the support 130 is made of a plastic material having heat dissipation as described above, at least one protrusion 132 is formed on one surface of the support 130 to increase the heat dissipation performance by increasing the contact area with the outside air. can

For example, as shown in FIG. 2 , a plurality of protrusions 132 may be formed in a portion of the support 130 covering the leg portion 124 of the metal plate 120 . Accordingly, the support 130 is formed to have a curved surface through the plurality of protrusions 132, so that the contact area with the outside air is widened, so that rapid heat exchange can occur.

In addition, the vehicle lighting device 100 according to an embodiment of the present invention may include a coupling portion 150 disposed to surround an edge of the circuit board 114 and integrally formed with the support body 130. there is. The coupling portion 150 may protrude from one surface of the horizontal portion 122 of the metal plate 120 to a predetermined height. In addition, the coupling part 150 may be formed with at least one coupler 152 protruding outward along the circumferential direction. When the vehicle light device 100 according to an embodiment of the present invention is applied to a vehicle, the coupler 152 is fastened to the frame or protective cover of the vehicle to fix the vehicle light device 100 to the vehicle. role can be fulfilled.

Meanwhile, the aforementioned lighting device 100 for a vehicle may further include a heat dissipation coating layer 160 . As shown in FIG. 4, such a heat dissipation coating layer 160 is formed on the surface of the metal plate 120 exposed to the outside when integrated with the support 130 such that one surface of the metal plate 120 is exposed to the outside. It can be. In addition, as shown in FIGS. 4 and 6 , the heat dissipation coating layer 160 may also be formed on the surface of the support 130 exposed to the outside when the support 130 is made of a plastic material having heat dissipation properties.

Such a heat dissipation coating layer 160 may be used without limitation as long as it is a material having heat dissipation properties.

Meanwhile, in the vehicle light device 200 shown in FIG. 8, except for the support 130 provided to cover both sides of the metal plate 120, other components are the vehicle lights shown in FIGS. 1 to 7. Since the contents of the device 100 are the same, a detailed description thereof will be omitted.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention may add elements within the scope of the same spirit. However, other embodiments can be easily proposed by means of changes, deletions, additions, etc., but these will also fall within the scope of the present invention.

100,200: vehicle lighting device 110: light source unit
112: LED 114: circuit board
115: fastening hole 116: adhesive layer
118: short-prevention member 120: metal plate
122: horizontal part 124: leg part
126: through hole 128: opening
130: support 132: protrusion
134: connector connection part 140: terminal pin
150: coupling part 152: coupling sphere
160: heat dissipation coating layer

Claims (13)

A light source unit including at least one LED mounted on one surface of the circuit board;
a metal plate for dispersing and dissipating the heat generated from the light source unit to the outside; and
A supporter supporting the metal plate to maintain the shape of the metal plate; includes,
One surface of the circuit board is directly attached to one surface of the metal plate via an adhesive layer,
The metal plate,
a plate-shaped horizontal portion to which the circuit board is attached; and
Including at least one leg portion extending in one direction from the rim of the horizontal portion,
The vehicle light apparatus of claim 1 , wherein the at least one leg portion is in contact with an outer side of the support body. According to claim 1,
The vehicle light apparatus of claim 1 , wherein the metal plate includes at least one through-hole formed through the metal plate to increase bonding force with the support body.
According to claim 1,
The support is integrated with the metal plate through insert injection molding,
The support is made of a plastic material having heat dissipation,
The vehicle light device includes a coupling portion disposed to surround an edge of the circuit board and integrally formed with the support body.
According to claim 1,
The vehicle lighting device includes a plurality of terminal pins integrally formed with the support body for electrical connection with the circuit board,
The plurality of terminal pins have one end protruding outward from the metal plate,
The support body is formed with a connector connection portion protruding to surround the plurality of terminal pins on one surface,
The circuit board has fastening holes through which the plurality of terminal pins are inserted,
A short circuit prevention member made of an insulating material is inserted into the fastening hole, and the plurality of terminal pins are inserted into the short circuit prevention member. delete delete delete delete delete delete delete delete delete

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