JP2009076338A - Lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp which provide sufficient heat dissipation effect even in reduction in size or weight thereof. <P>SOLUTION: The lamp has: a light source (such as LED) 50; a heat sink 51 equipped with the light source 50; and a holder 52 for holding an optical component related to light emission from the light source 50, wherein an air hole 58 is formed in a section that does not function as an optically reflective face of an upper reflector 53 or air holes 58 and 59 are formed in a section that does not function as an optically reflective face of upper and lower reflectors 53. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lamp for vehicles and the like.

  In recent years, a vehicular lamp using an LED or the like as a light source is required to be smaller and lighter. When used as a lighting application, since a brightness is required, for example, a large current is supplied to the LED. For this reason, 10% of the current supplied to the LED is converted to light, but the remaining 90% becomes heat, and it is necessary to dissipate the heat.

For example, Patent Document 1 discloses a vehicular lamp intended to dissipate heat. FIG. 16 is a view showing the vehicular lamp of Patent Document 1. As shown in FIG. Referring to FIG. 16, the vehicular lamp of Patent Document 1 includes a lamp unit 2 and a heat sink member 4, and the lamp unit 2 emits a light source 14 and light from the light source 14 in a predetermined direction. And the holding members 10 and 11 that hold the projection lens 15, and the heat sink member 4 has a mounting surface 23 to which the light source 14 and the holding members 10 and 11 are directly mounted, and six directions with respect to the mounting surface 23 Among them, the heat dissipating part 24 is provided in at least two directions excluding the direction in which the projection lens 15 is located, and the heat dissipating part 24 obtains a heat dissipating effect.
JP 2007-109613 A

  However, in the vehicle lamp of Patent Document 1 described above, since the heat sink member 4 is directly attached to the holding members 10 and 11, the air in the holding members 10 and 11 stays in the holding members 10 and 11. For this reason (because the air in the holding members 10 and 11 does not escape from the holding members 10 and 11), there is a problem that a sufficient heat dissipation effect cannot be obtained even if the heat radiating portion 24 is provided.

  In particular, as described above, downsizing and lightening of the lamps are required, so that downsizing of the lamps themselves and miniaturization and weight reduction of each member (element) are being promoted. As a result, the capacity of the air inside the lamp decreases, so there is a concern that the temperature of the air will rise. In addition, in order to reduce weight, each member (element) is being made into a resin, and the temperature of the resin member (element) is prevented in order to prevent the resin member (element) from being deformed due to a temperature rise. Sufficient heat dissipation design is necessary to suppress the rise. However, in the vehicle lamp of Patent Document 1 described above, since the heat sink member 4 is directly attached to the holding members 10 and 11, a sufficient heat dissipation effect cannot be obtained, and the lamp is reduced in size and weight. There was a problem that sufficient heat dissipation could not be expected.

  An object of the present invention is to provide a lamp capable of obtaining a sufficient heat dissipation effect even when it is reduced in size and weight.

  In order to achieve the above object, the invention according to claim 1 includes a light source, a heat sink to which the light source is attached, and a holder portion for holding an optical element related to emission of light from the light source. In the lamp, a gap serving as an air circulation path is provided between the holder portion and the heat sink.

  The invention described in claim 2 is a lamp having a light source, a heat sink to which the light source is attached, and a holder portion for holding an optical element related to emission of light from the light source. A gap serving as an air flow path is provided between the heat sink and the heat sink, and at least one vent hole is formed in the holder portion.

  The invention according to claim 3 is a lamp having a light source, a heat sink to which the light source is attached, and a holder portion for holding an optical element related to emission of light from the light source. A heat shield member is provided between the heat sink and the heat sink.

  According to a fourth aspect of the present invention, in the lamp having a light source, a heat sink to which the light source is attached, and a holder portion for holding an optical element related to emission of light from the light source, the holder portion Is formed with at least one vent hole, and a heat shield member is provided between the holder portion and the heat sink.

  According to a fifth aspect of the present invention, in the lamp according to the fourth aspect, the heat shield member is used as a duct for a vent hole formed in the holder portion.

  According to a sixth aspect of the present invention, in the lamp according to any one of the first to fifth aspects, the heat sink is provided with a fin, and the fin convects air in the holder portion. Thus, the heat sink is provided with an inclination that serves as a convection guide for radiating heat to the outside of the holder portion.

  According to the first aspect of the present invention, in the lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to emission of light from the light source, the holder portion Since a gap serving as an air flow path is provided between the heat sink and the heat sink, the heat dissipation effect can be enhanced as compared with a conventional vehicle lamp.

  According to the invention described in claim 2, in a lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to emission of light from the light source, A gap serving as an air flow path is provided between the holder part and the heat sink. Further, since at least one vent hole is formed in the holder part, heat from the light source or the heat sink is generated. Since heat is dissipated without stagnation in the holder part (by ventilating the air in the holder part), the air temperature in the holder part can be lowered (heat radiation effect can be enhanced), and optical elements such as optical lenses Deformation can be prevented.

  According to a third aspect of the present invention, in a lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to emission of light from the light source, Since a heat shield is provided between the holder and the heat sink, the heat from the heat sink is cut off (the inside of the holder is not affected by the heat dissipation of the heat sink). Since the air temperature does not increase, deformation of optical elements such as an optical lens can be prevented.

  According to the invention of claim 4, in a lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to emission of light from the light source, At least one vent hole is formed in the holder portion, and since a heat shield member is provided between the holder portion and the heat sink, the air temperature in the holder portion can be further lowered.

  According to a fifth aspect of the present invention, in the lamp according to the fourth aspect, since the heat shield member is used as a duct for a vent hole formed in the holder portion, the ventilation performance is improved by a chimney effect. Can be made.

  According to a sixth aspect of the present invention, in the lamp according to any one of the first to fifth aspects, the heat sink is provided with fins, and the fins are air in the holder portion. Since the heat sink is provided with an inclination that serves as a convection guide that radiates heat to the outside of the holder part by convection, the heat radiation air that has stagnated inside the holder part is easily released to the outside of the holder part. be able to.

  As described above, according to the present invention, it is possible to provide a lamp capable of obtaining a sufficient heat dissipation effect even when it is reduced in size and weight.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In the following description, it is assumed that the lamp is a vehicle lamp.

  1 and 2 are views for explaining a first embodiment of a lamp according to the present invention. 1 is a perspective view, and FIG. 2 is a cross-sectional view. Referring to FIGS. 1 and 2, the lamp of the first form holds a light source (for example, LED) 50, a heat sink 51 to which the light source 50 is attached, and an optical element related to the emission of light from the light source 50. And a holder portion 52 to be used.

  Here, as the optical elements held by the holder portion 52, in the example of FIGS. 1 and 2 (the same applies to the following embodiments and examples), a reflector (reflecting mirror) 53, a shutter 54, and an optical lens 55 are provided. Is provided. The optical elements, that is, the reflector 53, the shutter 54, and the optical lens 55 are made of, for example, resin.

  Further, in order to improve the light extraction efficiency from the light source 50, the heat sink 51 to which the light source 50 is attached is arranged with an inclination so as to approach the reflector 53. As will be described later, the heat sink 51 has fins attached in a predetermined arrangement.

  And in this 1st form, the clearance gap 57 used as the distribution | circulation path | route of air is provided between the holder part 52 and the heat sink 51. As shown in FIG.

  Thus, in the first embodiment, a gap 57 serving as an air flow path is provided between the holder 52 and the heat sink 51, so that the conventional vehicle lamp as shown in FIG. Compared with, heat dissipation effect can be enhanced.

  However, if the gap 57 serving as the air flow path is provided between the holder portion 52 and the heat sink 51 as in the first embodiment, heat is stagnated in the holder portion 52, and the holder portion 52. The temperature inside rises and a sufficient heat dissipation effect cannot be obtained.

  That is, when an LED is used as the light source 50, almost 90% of the heat generated from the LED is radiated from the heat sink 51, but 6.4% of the heat generated from the LED is between the holder portion 52 and the heat sink 51. Even in the case where a gap 57 serving as an air flow path is provided, heat is radiated into the holder portion 52 due to radiation and convection.

  Therefore, in the second embodiment, in the lamp of the first embodiment in which a gap 57 serving as an air circulation path is provided between the holder portion 52 and the heat sink 51, a vent hole is further formed in the holder portion 52. It is characterized by having.

  FIGS. 3A, 3B, 4, 5, and 6 are diagrams showing examples of the lamp of the second embodiment. Hereinafter, not only the portion that holds the optical element but also the whole including the optical element is referred to as a holder portion 52. In the example of FIG. 3A, a vent hole 58 is formed in a portion that does not function as a light reflecting surface of the upper reflector 53. In the example of FIG. 3B, vent holes 58 and 59 are formed in portions that do not function as the light reflecting surfaces of the upper and lower reflectors 53. In the example of FIG. 4, vent holes 60 and 61 are formed on the upper surface and the lower surface of the holder portion 52, for example. In the example of FIG. 5, a plurality of slit-shaped vent holes 62 are formed in the holder portion 52. In the example of FIG. 6, at least one vent hole 63 is formed in the holder portion 52, and at least one vent hole 64 is formed in a portion that does not function as a light reflecting surface of the reflector 53. In addition to the above example, for example, vent holes can be formed on the upper surface and side surfaces of the holder portion 52.

  As described above, in the examples such as FIGS. 3A to 6, in the configuration in which the gap 57 serving as an air circulation path is provided between the holder portion 52 and the heat sink 51, the holder portion 52 is further passed through. Since the pores are formed, the heat from the light source 50 and the heat sink 51 is dissipated without stagnation in the holder portion 52 (by ventilating the air in the holder portion 52). The temperature can be lowered (the heat dissipation effect can be increased), and deformation of optical elements such as the optical lens 55 can be prevented. In particular, in the example shown in FIGS. 3B to 6, the holder portion 52 is formed with a plurality of air holes. In this case, one of them is an air inlet, and the other is an air outlet. Thus, the air temperature in the holder portion 52 can be further lowered (the heat dissipation effect can be further enhanced).

  Moreover, FIG. 7 is a figure which shows an example of the lamp of a 3rd form. Referring to FIG. 7, the third embodiment includes a light source (for example, LED) 50, a heat sink 51 to which the light source 50 is attached, and a holder portion 52 that holds an optical element related to emission of light from the light source 50. In the lamp having the above, a heat shield member (for example, a heat shield plate) 65 is provided between the holder portion 52 and the heat sink 51 (for example, so as to close a gap 57 between the holder portion 52 and the heat sink 51). It is characterized by having.

  Here, as the heat shield member (for example, heat shield plate) 65, a heat insulating member having low thermal conductivity and low thermal emissivity is preferably used. The shape of the heat shield member (for example, heat shield plate) 65 may be flat, V-shaped, or hemispherical, as shown in FIGS. Further, the heat shield member (for example, heat shield plate) 65 is attached to the base portion of the heat sink 51 or the holder portion 52, and the heat radiated from the fins of the heat sink 51 does not convection inside the holder portion 52. It has a structure like this.

  In this way, by providing the heat shield member (for example, a heat shield plate) 65 between the holder portion 52 and the heat sink 51 (for example, in the gap between the holder portion 52 and the heat sink 51), the heat from the heat sink 51 is increased. Shut off (the inside of the holder portion 52 is not affected by the heat radiation of the heat sink 51), and the air temperature inside the holder portion 52 does not increase, thereby preventing deformation of optical elements such as the optical lens 55. Can do.

  Also, the second form and the third form can be combined. The fourth form is a combination of the second form and the third form. FIGS. 8A, 8B, and 9 are views showing an example of the lamp of the fourth embodiment. 8 (a) and 8 (b), vent holes 58 and 59 are formed as shown in FIGS. 3 (a) and 3 (b), and between the holder portion 52 and the heat sink 51 (for example, A heat shield member (for example, a heat shield plate) 65 is provided so as to close the gap 57 between the holder portion 52 and the heat sink 51. In the example of FIG. 9, vent holes 60 and 61 are formed on, for example, the upper surface and the lower surface of the holder portion 52 as shown in FIG. 4, and between the holder portion 52 and the heat sink 51 (for example, the holder portion). A heat shield member (for example, a heat shield plate) 65 is provided so as to close a gap 57 between the heat sink 52 and the heat sink 51.

  As described above, the fourth embodiment includes the light source (for example, LED) 50, the heat sink 51 to which the light source 50 is attached, and the holder portion 52 that holds the optical elements related to the emission of light from the light source 50. In the lamp, the holder portion 52 is formed with a vent hole, and a heat shield member 65 is provided between the holder portion 52 and the heat sink 51.

  In the fourth embodiment, a vent hole is formed in the holder portion 52, and the heat shield member 65 is provided between the holder portion 52 and the heat sink 51. By releasing the heat generated from the light source 50 to the outside of the holder 52 through the vent hole without being affected by the heat dissipation (because the heat generated from the light source 50 is dissipated without stagnation in the holder 52), the holder The air temperature in the part 52 can be further lowered. That is, deformation of optical elements such as the optical lens 55 can be prevented and the temperature of the light source 50 can be lowered.

  In the following table (Table 1), there are a first form (a structure without a vent hole and a heat shield member), a second form (a structure with a vent hole), and a fourth form (a vent hole and a heat shield member). For each of the structures, the result of measuring the temperature of the optical lens 55 by turning on the light source 50 is shown.

  From Table 1, the structure of the second embodiment with the vent hole can lower the temperature of the optical lens 55 than the structure of the first embodiment without the vent hole and the heat shielding member. It can be seen that the temperature of the optical lens 55 can be further lowered in the structure of the fourth embodiment with the heat member.

  Further, in the fourth mode (structure having a vent hole and a heat shield member) (for example, when vent holes are provided on the upper side and the lower side of the holder portion 52), as shown in FIG. Plate) 65 can also be used as the duct 66. Here, the shape of the duct may be a straight pipe, an elbow, or a hopper. Further, the duct may be formed integrally with the holder portion 52 or may be retrofitted. In the case of retrofitting, the lower duct 66 also serves as a heat shield member (for example, a heat shield plate) 65 (by using a heat shield member (for example, a heat shield plate) 65 for the lower duct 66), the lower duct 66 66 is a member having a low thermal conductivity and a low thermal emissivity, and can prevent an increase in the air temperature in the holder 52, and by providing a duct in the holder 52, the chimney effect The ventilation performance can be improved.

  Further, in the first to fourth embodiments described above, the fins 70 attached to the heat sink 51 are generally as shown in FIGS. 11A and 11B (FIG. 11A viewed from the bottom surface). FIG. 11B is a side view (front view), and the heat sink 51 is attached in parallel to the center line (center surface) A of the base portion 71. More preferably, the fin 70 is 12 (a) and 12 (b) (FIG. 12 (a) is a view seen from the bottom, FIG. 12 (b) is a side view (front view)), and the base portion 71 of the heat sink 51 is shown. The center line (center plane) A is preferably attached to the heat sink 51 with the inclination θ opposite to each other on the right side and the left side. That is, the fins 70 are preferably provided on the heat sink 51 with an inclination that serves as a convection guide that radiates the air in the holder portion 52 to the outside of the holder portion 52 by convection. In this case, the fin 70 of the heat sink 51 serves as a convection guide. For example, when applied to the lamp of the first form, the heat radiation air stagnated inside the holder part 52 in the lamp of the first form is removed from the holder part. It is possible to facilitate heat dissipation to the outside of 52.

  FIG. 13 shows convection when the fin 70 is attached to the heat sink 51 as shown in FIGS. 12A and 12B, and the radiated air stagnated inside the holder portion 52 due to this convection. Can be easily radiated to the outside of the holder portion 52.

  14 and 15, when a heat shield member (for example, a heat shield plate) 65 is provided (in FIG. 14, a flat plate heat shield member, in FIG. 15, a V-shaped heat shield member, In FIG. 15, the holder portion 52 is further provided with a vent hole), and the heat radiated from the fin 70 is not convected into the holder portion 52. As shown in FIGS. 12A and 12B, the fins 70 are attached to the heat sink 51 and the heat shield member (for example, the heat shield plate) 65 is provided to avoid the holder portion 52 (FIG. 15). (If you avoid the vents), you can escape the heat.

  As described above, according to the present invention (according to the above-described embodiments), it is possible to provide a lamp capable of obtaining a sufficient heat dissipation effect even when it is reduced in size and weight.

The present invention can be used for indoor lighting, outdoor lighting, and the like in addition to the vehicular lamp.

It is a figure for demonstrating the 1st form of the lamp which concerns on this invention. It is a figure for demonstrating the 1st form of the lamp which concerns on this invention. It is a figure which shows an example of the lamp of a 2nd form. It is a figure which shows an example of the lamp of a 2nd form. It is a figure which shows an example of the lamp of a 2nd form. It is a figure which shows an example of the lamp of a 2nd form. It is a figure which shows an example of the lamp of a 3rd form. It is a figure which shows an example of the lamp of a 4th form. It is a figure which shows an example of the lamp of a 4th form. It is a figure which shows the case where a thermal-insulation member is used as a duct. It is a figure which shows the general attachment arrangement | positioning of the fin of a heat sink. It is a figure which shows the attachment arrangement | positioning by the present invention of the fin of a heat sink. It is a figure which shows the convection by the attachment arrangement | positioning of the fin of FIG. It is a figure which shows a mode that the heat radiated from the fin does not convect to the inside of a holder part in the case where the heat shield member is provided. It is a figure which shows a mode that the heat radiated from the fin does not convect to the inside of a holder part in the case where the heat shield member is provided. It is a figure which shows the conventional lamp.

Explanation of symbols

50 Light source 51 Heat sink 52 Holder part 53 Reflector (reflector)
54 Shutter 55 Optical Lens 57 Gap 58, 59, 60, 61, 62, 63, 64 Air Vent 65 Heat Insulating Member 66 Duct 70 Fin

Claims (6)

In a lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to emission of light from the light source, air is interposed between the holder portion and the heat sink. A lamp characterized by a gap serving as a distribution channel. In a lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to emission of light from the light source, air is interposed between the holder portion and the heat sink. A lamp that is provided with a gap serving as a distribution channel, and further, at least one vent hole is formed in the holder portion. In a lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to light emission from the light source, a heat shield is provided between the holder portion and the heat sink. A lamp characterized in that a member is provided. In a lamp having a light source, a heat sink to which the light source is attached, and a holder portion that holds an optical element related to light emission from the light source, at least one vent hole is formed in the holder portion. The lamp is characterized in that a heat shield member is provided between the holder part and the heat sink. 5. The lamp according to claim 4, wherein the heat shield member is used as a duct of a vent hole formed in the holder portion. The lamp according to any one of claims 1 to 5, wherein the heat sink is provided with a fin, and the fin radiates air in the holder portion to the outside of the holder portion by convection. A lamp that is provided on the heat sink with an inclination that serves as a guide for proper convection.

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