JP2005293973A - Vehicular headlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular headlight capable of quickly releasing heat generated at reflectors. <P>SOLUTION: On the vehicular headlight 1 having the reflectors 13, 14, a light source part 11 held by the reflector 13, metal wire materials wound in coil-shape is arranged on the reflector 13 in flat shape, and a fin 15, composed of space parts 154 and contact parts formed by winding units alternately crossing the adjacent part in flat shape, is arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle headlight used for an automobile or a two-wheeled automobile.

  As a conventional vehicle headlight, the one shown in FIG. A conventional vehicle headlight 1 includes a light source 11, a housing 10 for holding the light source, and a reflector 13 for converging a light beam emitted from the light source.

Examples of the light source 11 of the vehicle headlight 1 include a halogen lamp, a discharge lamp, and recently a light emitting diode. A halogen lamp emits a light beam when a metal core material called a filament generates heat and emits light in a sealed container filled with a halogen gas. In addition, the discharge lamp collides electrons and metal atoms in the discharge lamp bulb by applying a high voltage (about 20,000 V) in a discharge lamp bulb (arc tube) filled with xenon gas or the like ( Arc discharge) to emit light. As a feature of the discharge lamp, it is possible to obtain a large amount of light with a light emission color which is close to that of sunlight and with less power consumption than a conventional halogen lamp. Further, in recent years, attention has been focused on light emitting diodes having high luminous efficiency.
In addition, a reflective coating is provided on the inner peripheral surface 133 of the reflector 13.

When the light source 11 is turned on, the light source 11 itself becomes a high temperature, and the temperature of the vehicle headlight 1 increases due to heat and heat radiation from the light source 11. In particular, since the reflector 13 is located in the vicinity of the light source, the temperature of the reflector 13 is high, and there is a problem that the reflective coating provided on the inner peripheral surface 133 is deteriorated.
Even when a light emitting diode having high luminous efficiency is used as the light source 11, although the luminous efficiency is high, in the case of a vehicle headlight, the output is large and heat generation is unavoidable. Further, in the case of a light emitting diode, there is a problem that the light emission efficiency is remarkably reduced at a high temperature, and heat dissipation in the vehicle headlight is an important issue.

  Conventionally, a method of using a circuit element or a substrate excellent in heat resistance is known, but there is a problem that the circuit element or the substrate is increased in size and weight, and the cost is increased.

  In view of this, (Patent Document 1) proposes that the housing be formed of a highly thermally conductive aluminum die cast in order to dissipate the heat inside the housing of the vehicle headlight to the outside. In addition, (Patent Document 2) discloses a vehicle headlight in which heat radiating fins are provided on an inner surface or an outer surface of a reflector. However, the configuration as described above uses a material having high thermal conductivity, or only provides a heat radiating member, and does not consider a shape for improving the heat radiating performance.

JP 2002-343128 A JP 2002-124123 A

  Therefore, in view of the above-described conventional situation, an object of the present invention is to provide a vehicle headlight that can quickly release heat generated in a reflector. Furthermore, it aims at providing the vehicle headlight which can discharge | release the heat inside a housing efficiently outside, and can suppress an internal temperature rise.

  In order to solve the above-mentioned problems, a vehicle headlight according to the present invention is a vehicle headlight comprising a reflector and a light source unit held by the reflector as claimed in claim 1, wherein the reflector includes a metal wire. Are provided with fins that intersect with each other and have a gap portion and a contact portion and are formed in a plane.

  According to the said structure, since the fin with a large surface area obtained using the metal wire is provided in a reflector, it becomes possible to thermally radiate the heat | fever of a reflector efficiently. And since a metal wire is crossed and provided, heat | fever conducts to the whole fin rapidly via the contact part of metal wires. Moreover, since a space | gap part arises, the surface area of the metal wire which contacts external air will become large, and heat will be discharge | released rapidly from the surface of a metal wire to external air.

  According to a second aspect of the present invention, there is provided a vehicle headlight including a reflector and a light source unit held by the reflector, wherein the reflector is formed with a flat metal wire wound in a coil shape and adjacent to the reflector. It is characterized in that fins that are formed in a plane having a gap portion and a contact portion crossing each other are provided.

According to the said structure, since the fin with a large surface area obtained using the coil-shaped metal wire is provided in a reflector, it becomes possible to thermally radiate | emit the heat | fever of a reflector efficiently. In addition, heat is conducted to the entire fin through the closely attached portion of the winding unit, and the heat dissipation performance is improved. Note that the flat formation of the metal wire wound in a coil shape is a concept that includes not only flattening the entire metal wire but also flattening a part of the metal wire.
Here, the coil shape is not limited to a circular shape, but includes various shapes such as a polygon such as a triangle or a quadrangle, an ellipse, or a star.

  Further, a third aspect of the present invention provides a vehicle headlight including a reflector and a light source unit held by the reflector, wherein only the side edge of the metal wire wound in a coil shape is flat in the reflector. A fin is formed and formed in a planar manner having a gap portion and a contact portion so that adjacent winding units at the side edge intersect each other.

  According to the said structure, only the side edge of a fin is flattened and the metal wire of the side edge of a fin is densified. In the portions other than the flattened side edges, the density of the metal wire becomes sparse, so that the gap is formed large.

  According to a fourth aspect of the present invention, in the vehicle headlight according to the second or third aspect, the coiled metal wire is wound in a clockwise manner and the coiled metal wire is wound in a leftward direction. It is a combination of metal wires.

  According to the said structure, a complicated uneven structure is formed in the side edge of a fin by mutual adhesion | attachment of the winding unit of a metal wire. Thereby, since the side edge of a radiation fin is densified, the heat | fever from a radiation board will conduct to a radiation fin rapidly. And in parts other than the flattened side edge, since the density of a metal wire becomes sparse, a space | gap part is formed large.

  According to the above configuration, the metal wires are densely formed and densely formed, the thermal conductivity is improved, and the heat dissipation performance is also improved. Moreover, since the metal wire wound by each of the right-handed winding and the left-handed winding is intertwined well, the stability of a form is provided.

  According to a fifth aspect of the present invention, in the vehicle headlight according to any one of the first to fourth aspects, the fins are arranged on the reflector so that the plane of the fins is perpendicular to the outer peripheral surface of the reflector. And

  According to the above configuration, the fins are arranged upright on the substrate, the entire surface area is increased, and the surface of the substrate can be ventilated through the gaps formed in the fins. Further, since the metal wires are densely packed and the side edges of the flat surfaces (contact portions between the fins and the substrate) are high in density, the thermal resistance when heat is conducted from the substrate is low.

  According to a sixth aspect of the present invention, in the vehicle headlight according to the fifth aspect, the fin is disposed in a groove provided on the outer peripheral surface of the reflector.

  According to the said structure, a fin is fixed reliably by the groove | channel provided in the outer peripheral surface of a reflector.

  A seventh aspect of the present invention is the vehicle headlight according to the first or second aspect, wherein the fin is arranged on the reflector so that the plane of the fin is parallel to the reflector.

  According to the said structure, a surface area is large and a fin is provided thinly in the whole.

  According to a eighth aspect of the present invention, in the vehicle headlight according to the seventh aspect, the fin is provided on the reflector via an adhesive layer.

  According to the said structure, a fin is reliably fixed with respect to a reflector by an adhesive layer.

  According to a ninth aspect of the present invention, in the vehicle headlight according to any one of the first to eighth aspects, a housing that surrounds the reflector is provided, and the housing is provided with a vent hole.

  According to the said structure, since air convects through a vent hole, the heat radiation by a fin is performed efficiently.

  A tenth aspect of the present invention is the vehicle headlight according to any one of the first to ninth aspects, wherein the metal wire is aluminum or an alloy thereof.

  According to the above configuration, a material having high thermal conductivity and low cost is selected as the metal wire.

The eleventh aspect is characterized in that in the vehicle headlight according to any one of the first to tenth aspects, a heat-radiating coating film is formed on the surface of the metal wire.

  According to the said structure, the thermal radiation by a fin is further accelerated | stimulated. In addition, a heat-radiative coating film means the coating film formed with the coating material containing the pigment which has thermal radiation effects, such as carbon black.

  Further, the present invention provides a vehicle headlight including a reflector and a light source unit held by the reflector, and the reflector has a gap formed in a sheet-like metal material in a two-dimensional or three-dimensional direction. It is characterized in that a fin is formed.

According to the above configuration, since the gap is formed in the two-dimensional or three-dimensional direction in the sheet-shaped metal material constituting the fin, the surface area of the metal material that comes into contact with the outside air is increased, and heat is generated from the surface of the metal material It will be promptly released to the outside.
Here, the two-dimensional direction refers to a case where, when, for example, a through-hole is provided in a sheet-like metal material, each through-hole is formed in a single direction and does not intersect three-dimensionally. The three-dimensional direction means that, for example, a plurality of through holes are provided, and the through holes are three-dimensionally intersected to form a gap.

  Further, a thirteenth aspect of the present invention is the vehicle headlight according to the twelfth aspect of the present invention, wherein the fin is provided on the reflector via an adhesive layer provided on both surfaces of the metal foil.

  According to the said structure, since heat is transmitted to a fin via metal foil with high heat conductivity, heat dissipation performance is improved. In addition, heat is directly radiated from the metal foil, improving the heat dissipation performance.

  Furthermore, according to a fourteenth aspect, in the vehicle headlight according to the thirteenth aspect, the metal foil is aluminum or an alloy thereof.

  According to the above configuration, a material having high thermal conductivity and low cost is selected as the metal foil.

  Furthermore, a fifteenth aspect is the vehicle headlight according to any one of the eleventh to fourteenth aspects, wherein the sheet-like metal material is aluminum or an alloy thereof.

  According to the above configuration, a material having high thermal conductivity and low cost is selected as the sheet-like metal material.

  As described above, according to the vehicle headlight of the present invention, high fining performance is imparted by providing the reflector with the fin having a large surface area obtained by effectively using the metal wire. That is, since the fin is formed so as to generate a gap portion and a contact portion by intersecting the metal wires, heat conduction is quickly performed on the entire fin through the contact portion. Then, heat is quickly released from the metal wire exposed to the gap to the outside air. Further, since the metal wires intersect each other, it is excellent in flexibility and can easily follow the curved surface of the reflector.

  In addition, since the metal wire wound in a coil shape is formed flat and adjacent winding units intersect each other, heat is quickly conducted from the contact portion to the entire fin. Moreover, the surface area of the metal wire is large, and heat can be quickly released through the voids generated in the fins. Furthermore, since a metal wire wound in a coil shape is used, it is very excellent in flexibility.

Hereinafter, the present invention will be described based on embodiments.
Embodiment (1) of this invention is demonstrated based on FIGS. 1-3. FIG. 1 is a perspective view of a vehicle headlight. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a partially enlarged view of FIG.

The vehicle headlight 1 according to the embodiment (1) of the present invention includes a housing 10, a lens 14 attached to a front end opening 102 thereof, a reflector 13 provided inside the housing 10, and a reflector 13. The light source 11 is held, a groove 131 is formed on the outer peripheral surface 134 of the reflector 13, and the groove 131 is provided with fins 15.
In FIG. 1, in order to avoid the complexity of the drawing, only a few rows of fins 15 are drawn, and the other rows are partially omitted.

The housing 10 is made of metal or a resin material having excellent heat resistance. When a resin material is used, it is preferable to use a material having high thermal conductivity. The housing 10 is provided with a front end opening 102 so that the lens 14 can be attached. The lens 14 only needs to be translucent, and glass, resin material, or the like is used.
The housing 10 is preferably provided with a vent hole 101. The heat released from the fin 15 is quickly released to the outside of the housing 10 through the vent hole 101.

  As the light source 11, various light sources such as a discharge lamp, a halogen lamp, and a light emitting diode can be used. Among the light sources, it is preferable to use a light emitting diode having high luminous efficiency.

  The lighting device 12 supplies electric power necessary for lighting the light source 11, and has an electric circuit built in the case. As the material of the case, aluminum having good thermal conductivity is used.

  The reflector 13 is formed in a concave shape, and is configured to converge the light beam by reflecting the light beam emitted from the light source 10 toward the lens 14 by a reflection film provided on the inner peripheral surface 133. . A plurality of grooves 131 are provided on the outer peripheral surface 134 of the reflector 13, and fins 15 made of a metal wire wound in a coil shape are arranged along the grooves 131. In addition, a holding part 132 for holding the light source 11 is formed at the center of the reflector 13. As a material of the reflector 13, the whole is comprised with the metal material, or it is comprised by combining 2 or more types of materials of nonmetallic materials, such as glass, glass ceramic, a plastics, and a metal material.

  The groove 131 provided in the reflector 13 can be formed by cutting the surface of the reflector 13. Further, the reflector 13 provided with the groove 131 can be directly manufactured by die casting, extrusion molding, or the like. Note that the pitch, shape, and the like of the grooves 131 can be appropriately set according to the required heat dissipation performance, the size of the fins 15, and the like.

  The fin 15 is formed by flatly forming a metal wire wound in a coil shape, and the adjacent winding units 15a and 15b intersect each other. Specifically, a coiled metal wire 15A wound in a left-handed manner and a coiled metal wire 15B wound in a right-handed winding are coaxially combined, and each metal wire 15A, 15B is formed flat. It is made by doing. The fins 15 are coiled metal wires 15A and 15B wound in different directions and are coaxially combined. Therefore, the metal wires are densely formed and densely formed, heat conductivity is improved, and heat dissipation performance. Will also improve. Moreover, since the metal wires 15A and 15B are intertwined well, the stability of the form is imparted. Then, when the coil is continuously rolled, the coil does not stretch due to strength or the like, and can be crushed well.

  In the example of FIG. 1, the fins 15 are inserted along the grooves 131 and are erected so that the fins 15 are perpendicular to the outer peripheral surface 134 of the thermally conductive reflector 13. Here, since the fin 15 is made of a metal wire wound in a coil shape, the side edges 15c and 15d have a high density due to the denseness of the metal wire. Therefore, when arranged in the groove 131 of the reflector 13, the density of the metal wire on the side edge 15c is high, so that the thermal resistance between the reflector 13 and the fin 15 is reduced, and the heat moves quickly. .

  Further, since the metal wires 15A and 15B are formed flat, the contact area of the contact portion 153 where the winding units are in contact with each other is increased. Thereby, heat is quickly conducted to the entire fin 15 through the contact portion 153. Moreover, since it is a coil-shaped metal wire, the surface area of the fin 15 becomes large, and therefore high heat dissipation performance can be obtained. In addition, since the gap portion 154 is formed in the fin 15, the contact area between the metal wire and the outside air is particularly large, and the gap portion 154 functions as a vent hole through which air or the like flows. For this reason, the heat conducted to the fin 15 is quickly released to the outside.

  Note that the contact portions 153 in which the respective winding units are in contact with each other can be fixed by means such as soldering, solder plating, adhesive, adhesive, vibration welding, welding such as flash welding, or the like. By fixing the contact portion 153, each winding unit is securely adhered to each other, and the mechanical stability of the entire fin 15 is improved and the thermal conductivity is also improved.

  In order to form a metal wire wound in a coil shape flatly, it can be performed by crushing by a known means such as rolling. In addition, a long fin 15 can be obtained by continuously rolling a coil fed in one direction. At this time, it is preferable to appropriately set the rolling pressure, the rolling angle, and the like so that the adjacent winding units 15a and 15b are in close contact with each other.

  The fin 15 can be made of various materials. Specific examples include metal materials such as aluminum, copper, silver, and gold, or alloys of these with nickel, magnesium, zinc, silicon, and the like. A copper-based or aluminum-based material is preferably used because of its excellent thermal conductivity. In particular, an aluminum-based material is preferably used because it is excellent in thermal conductivity and flexibility, is lightweight, and is low in cost.

  Further, as the material of the metal wire of the fin 15, a corrosion-resistant metal can be used. Depending on the use of the vehicle headlight, it may be used in a corrosive environment, which is suitable for such a case. Examples of the corrosion-resistant metal include titanium, its alloy, and stainless steel.

  Moreover, the metal wire which comprises the fin 15 can be surface-treated in order to improve thermal conductivity and corrosion resistance as needed. Specific examples include copper plating and silver plating. Moreover, when using aluminum or its alloy as a raw material, it is preferable to perform an anodic oxide film treatment (alumite treatment) on the surface. As a result, the corrosion resistance is improved and the thermal resistance of the contact portion 153 in close contact with each other of the winding units 15a and 15b is reduced, so that the overall heat dissipation can be further improved. As the treatment method, a known process can be adopted. Specifically, an oxide film can be formed by performing electrolysis in a liquid such as oxalic acid, sulfuric acid, phosphoric acid, etc., using the treated material as an anode. it can. The anodized film treatment includes so-called white alumite and black alumite, both of which are applicable.

  The fins 15 are arranged along the grooves 131 of the reflector 13 and fixed to the reflector 13. In this case, various means can be adopted on condition that the thermal conductivity is not impaired. For example, when solder is used as the fixing means, since the gap between the fin 15 and the groove 131 is filled with the solder, the heat transfer from the reflector 13 to the fin 15 becomes smooth. Moreover, it is also possible to use a heat conductive adhesive as a fixing means. Examples of thermally conductive adhesives include metal powders such as gold, silver, and nickel, alumina, aluminum nitride, silicon nitride, carbon powder, etc. blended in a binder such as epoxy resin, silicone resin, acrylic resin, urethane resin, etc. Can be mentioned.

  In addition to the fixing means described above, a method of fixing the fin 15 directly to the groove 131 of the reflector 13 by welding such as vibration welding or flash welding can be used. Moreover, the method of fixing the fin 15 by narrowing the width | variety of the groove | channel 131 by providing the fin 15 in the groove | channel 131 and mechanically caulking the whole after that is mentioned.

  According to the vehicle headlight 1 according to the embodiment (1), the heat generated in the reflector 13 as the light source 11 is turned on is quickly dissipated by the fins 15 provided on the outer peripheral surface 134. The housing 10 is provided with a vent hole 101, and heat radiation from the fins 15 is promoted by the air that enters and exits through the vent hole 101.

  And since the fin 15 is formed flat, the contact area of the contact part 153 formed by the adjacent winding units 15 a and 15 b intersecting each other is large, and the conducted heat is transmitted to the entire fin 15. It becomes possible. Furthermore, since the fin 15 is formed from a coiled metal wire, the surface area is large, and heat conducted to the entire fin 15 can be quickly dissipated. In particular, since the gap portion 154 is formed in the fin 15, the contact area with the outside air is large, and the heat dissipation performance is further improved.

  In addition, since the fin 15 uses a metal wire wound in a coil shape, the fin 15 is extremely excellent in flexibility, so that the fin 15 can flexibly cope with a curved surface such as the reflector 13. It can be freely bent and fixed to the reflector 13.

  In the above embodiment (1), the fins 15 are arranged in the grooves 131 so as to stand upright with respect to the outer peripheral surface 134 of the reflector 13. However, the present invention is not limited to this. You may provide so that it may become diagonal with respect to the outer peripheral surface 134 of this.

  Moreover, in the said Embodiment (1), although the fin 15 is arranged along the groove | channel 131 provided toward the center part of the reflector 13, it is not limited to this. For example, the fins 15 can be arranged along the circumferential direction of the outer peripheral surface 134 of the reflector 13.

  Moreover, in the said Embodiment (1), although the fin 15 is arranged along the groove | channel 131 provided in the reflector 13, it is not limited to this. For example, the fin 15 may be soldered directly without providing a groove on the outer peripheral surface 134 of the reflector 13.

  Moreover, in the said Embodiment (1), what flattened the whole metal wire wound by the coil form is used as the fin 15, However, It is not limited to this, One of a metal wire Only the part may be flattened. For example, by flattening only the side edge 15c of the fin 15, the side edge 15c, which is a contact portion with the groove 131, has a complicated shape in which metal wires are densely packed, such as a central portion, a side edge 15d, and the like. As for, the metal wire becomes sparse and the gap is formed larger.

  In this case, the heat generated in the reflector 13 is conducted to the entire fin 15 through the side edges 15c and 15d where the metal wires are densely packed. Then, the heat conducted to the entire fin 15 is quickly released from the gap generated in the central portion where the metal wire becomes sparse. Further, since only a part of the metal wire wound in a coil shape is flattened, the cost for forming can be kept low.

  Furthermore, in the said Embodiment (1), although the lens 14 is comprised so that it may attach to the housing 10, the lens 14 and the housing 10 may be integrally molded.

  Next, an embodiment (2) of the present invention will be described with reference to FIGS. FIG. 4 is a sectional view of the vehicle headlight 1 representing the embodiment (2). FIG. 5 is a partially enlarged view of FIG.

  The vehicle headlight 1 according to the embodiment (2) of the present invention is such that the fin 15 is parallel to the outer peripheral surface 134 of the reflector 13 in the vehicle headlight according to the embodiment (1). It is characterized by being provided. In addition, the fin 15 is being fixed to the outer peripheral surface 134 of the reflector 13 via the adhesive layers 21a and 21b with which both surfaces of the base material 22 were equipped.

  Also in the embodiment (2), since the fin 15 is excellent in flexibility in a direction perpendicular to the flat surface 151, it can easily follow the outer peripheral surface 134 of the reflector 13. And since the metal wire is formed flat in the fin 15, it becomes possible to contact the adhesive layer 21a on the surface. For this reason, the heat generated in the reflector 13 is quickly conducted to the fins 15 through the adhesive layers 21 a and 21 b and the base material 22.

  The pressure-sensitive adhesive layers 21a and 21b are for bonding and fixing the fins 15 to the outer peripheral surface 134 of the reflector 13. A heat-conductive pressure-sensitive adhesive, adhesive, or the like can be used. Examples of the heat-conductive pressure-sensitive adhesive and adhesive include those in which a heat-conductive filler having high heat conductivity is blended in a binder. As thickness of adhesive layers 21a and 21b, it is preferred that it is 5-500 micrometers.

  As the binder, acrylic resin, urethane resin, epoxy resin, silicon resin, polyimide resin, natural rubber, polyisoprene, polyisobutylene, polychloroprene, or the like can be used. The binder can be appropriately selected according to the type of metal forming the fin 15 and the temperature region of the reflector 13.

As the heat conductive filler, filling of metal with excellent conductivity such as silicon nitride, boron nitride, aluminum nitride, aluminum oxide, magnesium oxide, titanium oxide, silicon carbide, aluminum, copper, gold, silver, iron, nickel, etc. It is preferable to use an agent, graphite carbon, or the like.
Further, by adding ferrite powder, it is possible to impart not only thermal conductivity but also high electromagnetic wave absorption capability to the pressure-sensitive adhesive layers 21a and 21b.

  In addition, as the form of the thermally conductive filler, various shapes such as powder, sphere, fiber, and flake can be used, but the contact area between the particles of the thermally conductive filler. In order to increase the size, a powdery or spherical one is preferably used. In this case, the average particle diameter of the thermally conductive filler is preferably 0.1 μm to 100 μm, and more preferably 1 to 10 μm. When the particle size is large, it cannot be filled with high density, and furthermore, the surface of the pressure-sensitive adhesive layer 21 may be uneven. In addition, when the particle size is small, the dispersion is high, so the contact area between the particles is small, and the thermal conductivity of the pressure-sensitive adhesive layer 12 as a whole may decrease.

  And although the said heat conductive filler can also be used individually by 1 type, it is preferable to use combining 2 or more types from which a particle size differs. Since the particles having a small particle shape are filled so as to fill the gap generated between the particles having a large particle size, the filling rate is increased and the thermal conductivity of the entire pressure-sensitive adhesive layer is improved.

  As content of a heat conductive filler, it is preferable that it is 30-80 wt% with respect to adhesive layer 21a, 21b, and 50-70 wt% is more preferable. When there is little content of a heat conductive filler, the heat conductivity by a heat conductive filler cannot fully be obtained. Moreover, when there is much content of a heat conductive filler, the softness | flexibility of the adhesive layer 12 falls and the adhesiveness with the heat generating surface of the fin 11 or a heat generating body may fall.

  A terpene resin, a terpene phenol resin, a xylene resin, a rosin resin, a petroleum resin, a coumarone-indene resin, a phenol resin, or the like is added to the adhesive layers 21a and 21b as necessary. It is also possible. Moreover, phthalic acid ester, castor oil, etc. may be added as a plasticizer, and other additives such as a softener, a flame retardant, a color pigment, and an antioxidant can be added.

  The substrate 22 imparts structural stability to the pressure-sensitive adhesive layers 21a and 21b, and various materials such as cloth, paper, cellophane, polyethylene, PVC, and polyester can be used as the material. . Further, similarly to the pressure-sensitive adhesive layer 21, a heat conductive filler can be added to the base material 22. As thickness of the base material 22, 1-50 micrometers is preferable and it is especially preferable that it is 2-5 micrometers. When the thickness of the substrate 22 is large, the thermal resistance increases and the thermal conductivity decreases. Moreover, when the thickness of the base material 22 is small, the structural stability of the pressure-sensitive adhesive layers 21a and 21b is reduced, and the pressure-sensitive adhesive layer 21a does not adhere to the fins 15, so that the thermal conductivity may be reduced. .

  In addition, about other structures, such as the material of the fin 15, it applies to said Embodiment (1).

  Even in the case of the above embodiment (2), the pressure-sensitive adhesive layer 21 containing the heat conductive filler has high heat conductivity, so that heat generated in the reflector 13 can be efficiently transmitted to the fins 15. Become. The heat conduction to the entire fin 15 and the heat radiation action from the fin 15 to the outside are performed in the same manner as in the embodiment (1).

  In the above embodiment (2), the fixing means for the fins 15 is provided with the adhesives 21a and 21b on both surfaces of the substrate 22, but is not limited to this. It is also possible to fix the fins 15 using only the heat conductive adhesive without providing the material 22. In this case, since there is no thermal resistance due to the base material 22 and the thermal conductivity is improved, the heat generated in the reflector 13 can be quickly transmitted to the fins 15.

  Further, in the above embodiment (2), the heat conductive adhesive is used as the fixing means for the fins 15, but is not limited to this. In addition to the heat conductive adhesive, for example, the fin 15 may be fixed to the outer peripheral surface 134 of the reflector 13 by using means such as soldering, solder plating, vibration welding, flash welding or the like.

  Furthermore, in the said Embodiment (2), although the fin 15 is provided in the outer peripheral surface 134 toward the center part of the reflector 13, it is not limited to this. For example, the fins 15 can be provided along the circumferential direction of the outer peripheral surface 134 of the reflector 13.

  In the above embodiments (1) and (2), a metal wire wound in a circular coil shape is used, but the present invention is not limited to this. That is, a coiled metal wire wound in various shapes such as a polygon such as a triangle or a quadrangle, an ellipse, or a star can be used in addition to a circle. When a coil-shaped metal wire wound in a quadrangular shape is used, adjacent winding units overlap with each other and the area of close contact increases, so that the thermal conductivity increases. In addition, when a coiled metal wire wound in a complicated shape such as a star shape is used, the heat dissipation performance is improved because the surface area is increased.

  Next, the embodiment (3) will be described with reference to FIGS. FIG. 6 is an enlarged view of the fins 15 provided in the vehicle headlight 1 according to the embodiment (3). FIG. 7 is a top view of the fin 15.

  In the vehicle headlight 1 according to the embodiment (3), in the vehicle headlight of the embodiment (1), the planar fins 15 that are formed in a mesh shape by intersecting the metal wires are formed on the reflector 13. It is provided. The fins 15 are fixed to the outer peripheral surface 134 of the reflector 13 by pressure-sensitive adhesive layers 21 a and 21 b provided on both surfaces of the base material 22.

  The fin 15 is provided in the adhesive layer 21 so that the metal wire is exposed. And the fin 15 is provided so that a metal wire may cross | intersect, and the contact part 153 and the space | gap part 154 are formed.

  In addition, about other structures, such as the material of the fin 15, it applies to said Embodiment (1). Moreover, about the adhesive layer 21 and the base material 22, it applies to said Embodiment (2).

  According to the embodiment (3) of the present invention, the heat conducted from the reflector 13 to the pressure-sensitive adhesive layer 12 is quickly transferred to the fin 15 from the contact surface between the fin 15 and the pressure-sensitive adhesive layer 21. In particular, since the metal wires are provided so as to intersect with each other, heat can be quickly conducted to the entire fins 15 via the contact portions 153 between the metal wires. Further, since the fin 15 is made of a metal wire, the surface area is large, and further, since the gap portion 154 is formed, the surface area of the metal wire that comes into contact with the outside air is increased, and the heat conducted to the fin 15 is generated by the metal wire. It will be quickly released from the surface to the outside air. Further, since the fin 15 formed by intersecting the metal wires is excellent in flexibility, it can follow the outer peripheral surface 134 of the reflector 13 well.

  In the above embodiment (3), the metal wires are provided orthogonally, but the present invention is not limited to this, and any form may be adopted as long as they intersect. For example, a form in which metal wires formed in a ring shape are adjacent so as to cross each other, a form in which a metal wire wound in a spiral shape and a linear metal wire cross each other, etc. .

  Moreover, in the said embodiment (3), by crushing a metal wire flatly, the contact area of the fin 15 and the adhesive layer 21 and the contact area of the contact part of metal wires can be enlarged, Thermal conductivity can be improved.

  Furthermore, in the said Embodiment (3), it is also possible to comprise the fin 15 continuously, for example by arranging the several planar fin 15 in the adhesive layer 21 side by side.

  In addition, in said Embodiment (1)-(3), although the cross section is circular as a metal wire, what was formed in the irregular surface may be used. As the irregular surface, (a) a polygonal shape, (b) a star shape, (c) a wire shape by twisting a plurality of metal wires, (d) a rectangular shape (tape shape), etc. As described above, various shapes can be employed. In particular, a star shape, a wire shape, and the like have particularly complicated shapes, and the heat radiation performance is improved because the surface area is increased. It is also possible to form a flawed surface by forming a flaw in the wire, such as a wire flaw.

  Next, an embodiment (4) of the present invention will be described with reference to FIGS. FIG. 8 is an enlarged view of the fins 15 provided in the vehicle headlight 1 according to the embodiment (4). FIG. 9 is a top view of the radiation fin 15.

  The vehicle headlight 1 according to the embodiment (4) is a fin provided with a gap portion 154 with respect to the sheet-like metal material formed in the concavo-convex structure in the vehicle headlight of the embodiment (1). 15 is provided in the reflector 13. In addition, the fin 15 is contact-fixed to the outer peripheral surface 134 of the reflector 13 by the adhesive layers 21 a and 21 b provided on both surfaces of the metal foil 23.

  The fins 15 are formed by punching circular through holes in the vertical direction with respect to the sheet-like metal material formed in the concavo-convex structure. For this reason, the air gap part 154 is formed between the fin 15 and the fin 15 and the metal foil 23. The fin 15 may have a substantially planar shape, and may have a wave shape so as to increase the surface area.

  Further, the sheet-like metal material constituting the fin 15 can be made of various materials. Specific examples include metal materials such as aluminum, copper, silver, and gold, or alloys of these with nickel, magnesium, zinc, silicon, and the like. In particular, an aluminum-based material is preferably used because of its excellent thermal conductivity and flexibility and low cost.

  Furthermore, the surface of the sheet-like metal material can be subjected to surface treatment as necessary, as in the embodiment (1), and a coating film containing ferrite, a thermal radiation coating film, or the like is formed. Can do. It is also possible to increase the surface area by making the surface of the sheet-like metal material uneven.

The metal foil 23 is for transferring heat from the pressure-sensitive adhesive layer 21 to the fins 15 and can be made of various materials in the same manner as the sheet-like metal material. In particular, an aluminum-based material is preferably used because it is excellent in thermal conductivity and flexibility and is low in cost. Moreover, as thickness of the metal foil 23, it is preferable that it is 1-100 micrometers from a viewpoint of intensity | strength and heat conductivity.
The metal foil 23 also functions as a component that absorbs electromagnetic waves emitted from electronic components in the vehicle.

  In addition, about other structures, such as a material of the fin 15, it applies to said Embodiment (1). Moreover, about the adhesive layer 21, it applies to said Embodiment (2).

  According to the above embodiment (4), the heat conducted from the reflector 13 to the pressure-sensitive adhesive layer 21 is transmitted to the fins 15 through the metal foil 23. In particular, since the sheet-like metal material is formed in an uneven structure, the fin 15 has a large surface area. The heat conducted from the heat generating surface to the pressure-sensitive adhesive layer 21 is quickly transmitted to the fins 15 through the metal foil 23 provided between the fins 15 and the pressure-sensitive adhesive layer 21. And since the fin 15 is comprised from a metal material, heat | fever transfers to the whole fin 15 rapidly. Since the gaps 154 are provided in the fins 15, the surface area of the metal material that comes into contact with the outside air is increased, and heat is quickly released from the surface of the metal material to the outside air. And since the fin 15 comprised from a sheet-like metal material is excellent in a softness | flexibility, it can be made to follow favorably also with respect to the outer peripheral surface 134 of the reflector 13. FIG.

  Moreover, since the metal foil 23 is provided between the fin 11 and the adhesive layer 21, it becomes possible to absorb the electromagnetic waves emitted from an electronic component or the like.

  In the embodiment (4), the sheet-like metal material forming the fins 15 is formed with circular through holes in the vertical direction. However, the present invention is not limited to this. It is also possible to provide a through-hole having an irregular surface such as. Also, it is possible to provide through holes not only in the vertical direction but also in various directions. Furthermore, by providing through holes in a plurality of directions, it is possible to three-dimensionally intersect each through hole and provide a gap from a three-dimensional direction.

  As described above, the vehicle headlight 1 of the present invention is provided with fins having excellent heat dissipation performance, and is suitably used for headlights of various automobiles, motorcycles and the like.

It is a perspective view of the vehicle headlight which concerns on embodiment (1). It is AA sectional drawing of FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is sectional drawing of the vehicle headlight which concerns on Embodiment (2). It is the elements on larger scale of FIG. It is a cross-sectional enlarged view of the vehicle headlight according to Embodiment (3). FIG. 7 is a top view of FIG. 6. It is a cross-sectional enlarged view of the vehicle headlight according to Embodiment (4). FIG. 9 is a top view of FIG. 8. It is a figure which shows the prior art example of the headlight for vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle headlight 10 Housing 101 Ventilation hole 11 Light source 12 Lighting device 13 Reflector 131 Groove 132 Holding part 133 Inner peripheral surface 134 Outer peripheral surface 14 Lens 15 Fin 15A, 15B Metal wire 15a, 15b Winding unit 15c, 15d Side edge 151 Flat surface 153 Contact portion 154 Gaps 21, 21a, 21b Adhesive layer 22 Base material 23 Metal foil

Claims (15)

  A vehicle headlight comprising a reflector and a light source unit held by the reflector, wherein the reflector has fins formed in a plane having a gap portion and a contact portion by intersecting metal wires. Vehicle headlight provided.   A vehicle headlight including a reflector and a light source unit held by the reflector, wherein the reflector is formed with a flat metal wire wound in a coil shape, and adjacent winding units are mutually connected. A vehicle headlight provided with fins that intersect and have a gap portion and a contact portion and are formed in a planar manner.   A vehicle headlight comprising a reflector and a light source unit held by the reflector, wherein only a side edge of a metal wire wound in a coil shape is formed flat on the reflector, and the side edge In the vehicle headlight, the adjacent winding units intersect with each other and are provided with fins that are planarly formed with a gap portion and a contact portion.   The headlight for a vehicle according to claim 2 or 3, wherein the coiled metal wire is a combination of a coiled metal wire wound in a right turn and a coiled metal wire wound in a left turn. A vehicle headlight characterized by being a thing.   The vehicle headlight according to any one of claims 1 to 4, wherein the reflector is arranged on the reflector so that a plane of the fin is perpendicular to an outer peripheral surface of the reflector.   6. The vehicle headlight according to claim 5, wherein the fin is disposed in a groove provided on an outer peripheral surface of the reflector.   3. The vehicle headlight according to claim 1, wherein the reflector is arranged on the reflector so that the plane of the fin is parallel to the reflector.   8. The vehicle headlight according to claim 7, wherein the fin is provided on the reflector via an adhesive layer.   The vehicle headlight according to claim 1, further comprising a housing surrounding the reflector, wherein the housing is provided with a vent hole.   The vehicle headlight according to any one of claims 1 to 9, wherein the metal wire is aluminum or an alloy thereof.   The vehicle headlight according to any one of claims 1 to 10, wherein a heat-radiating coating film is formed on a surface of the metal wire.   A vehicle headlight comprising a reflector and a light source unit held by the reflector, wherein the reflector is provided with fins in which a gap is formed in a sheet metal material from a two-dimensional or three-dimensional direction. Vehicle headlights.   13. The vehicle headlight according to claim 12, wherein the fin is provided on the reflector via an adhesive layer provided on both surfaces of the metal foil.   14. The vehicle headlight according to claim 13, wherein the metal foil is aluminum or an alloy thereof.   The vehicle headlight according to any one of claims 11 to 14, wherein the sheet-like metal material is aluminum or an alloy thereof.

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