JP2010021087A - Vehicular lighting fixture - Google Patents

Abstract

Provided is a vehicular lamp capable of reducing weight and improving heat dissipation.
A vehicular lamp is composed of a first unit and a second unit. Each unit 10 and 20 has heat sinks 17 and 23, and the heat sinks 17 and 23 have bases 17a and 23a and heat radiation fins 17b and 23b. The pedestals 17a and 23a extend vertically and horizontally, and the light sources 11 and 21 are provided on the pedestals 17a and 23a. The radiating fins 17b and 23b are flat plates extending in the front-rear and up-down directions on the pedestals 17a and 23a. Since the bases 17a and 23a and the heat radiation fins 17b and 23b have the above-described structure, the heat released from the heat radiation fins 17b and 23b is smoothly discharged without being trapped in the heat sinks 17 and 23.
[Selection] Figure 2

Description

  The present invention relates to a vehicular lamp.

  Conventionally, a vehicular lamp that emits light from a light source such as an LED (Light Emitting Diode) forward is known. This vehicle lamp includes a light source support block having a horizontal plane, a light emitting diode mounted on the horizontal plane of the light source support block, and a heat sink provided below the light source support block (Patent Document 1). reference).

However, in this vehicle lamp, the weight of the vehicle lamp itself is increased by the light source support block. Therefore, a vehicle lamp in which a light source is directly attached to a heat sink has been proposed. According to this vehicle lamp, it is possible to reduce the weight by the weight of the light source support block (see Patent Document 2).
JP 2004-31224 A JP 2008-47385 A

  However, according to the conventional vehicular lamp, the light source is installed on the horizontal plane and heat is radiated by the heat sink below the horizontal plane. Therefore, the heat released by the heat sink rises and accumulates in the heat sink. The performance is not enough.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a vehicular lamp capable of reducing weight and improving heat dissipation. is there.

  A vehicular lamp according to the present invention is a vehicular lamp that emits light from a light source in a predetermined direction, and includes a pedestal on which the light source is installed, and a plurality of radiating fins extending from the pedestal. The heat sink has a heat release structure that releases the released heat upward.

  According to this vehicle lamp, since the light source is provided on the pedestal of the heat sink, the weight can be reduced as compared with the case where a member is interposed between the light source and the pedestal. In addition, the heat sink has a heat release structure that releases the released heat upward, so that the heat released by the heat radiating fins will escape smoothly upward, and it will be prevented from trapping in the heat sink, improving heat dissipation To do.

  According to the vehicular lamp of the present invention, it is possible to reduce the weight and improve heat dissipation.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a perspective view of a vehicular lamp according to the present embodiment. As shown in FIG. 1, the vehicular lamp 1 emits light forward (in a predetermined direction), and includes a first unit 10 and a second unit 20 provided above the first unit 10. These are configured to be housed in a headlight room or the like. In the present embodiment, the vehicular lamp 1 housed in the right headlight chamber will be described as an example. However, the vehicular lamp 1 housed in another place is not limited to the right headlight chamber. .

  2 is a sectional view of the vehicular lamp 1 shown in FIG. 1 taken along the line II-II. The first unit 10 mainly includes a light source 11, a first reflector 12, a second reflector 13, a shade 14, a lens 15, a blocking plate 16, and a heat sink 17.

  The light source 11 emits light, and for example, a semiconductor light emitting element is used. The 1st reflector 12 has the reflective surface 12a based on the rotation paraboloid, and is provided so that the light source 11 may be located in the 1st focus vicinity. The first reflector 12 is in an open state at the top, and is configured to reflect light from the light source 11 upward.

  The 2nd reflector 13 has the planar reflective surface 13a, and reflects the light reflected by the 1st reflector 12 toward the lens 15 side. A shade 14 is provided at a position below the second reflector 13, that is, in the vicinity of the second focal point of the first reflector 12. A part of light is cut by the shade 14 to form a cut line. It has become. The cut line is not limited to being formed by the shade 14, and the cut line is formed by not partially reflecting the light, such as by partially cutting off the reflection surface 13 a of the second reflector 13. Also good.

  The lens 15 transmits the light reflected by the second reflector 13 and emits it as parallel light substantially parallel to the horizontal plane. The blocking plate 16 blocks light emitted directly from the light source 11 toward the lens 15 and prevents glare light.

  The heat sink 17 is a metal member that dissipates heat from the light source 11, and includes a pedestal 17a and a plurality of heat radiating fins 17b. The pedestal 17a has a flat surface 17c extending vertically and horizontally, and a light source unit 11A including the light source 11 is directly provided on the flat surface 17c by screwing or the like. The plurality of heat radiating fins 17b are flat plates extending in the front-rear and up-down directions behind the pedestal 17a.

  The second unit 20 mainly includes a light source 21, a cylindrical lens 22, and a heat sink 23. The light source 21 emits light, and for example, a semiconductor light emitting element is used. The cylindrical lens 22 transmits light from the light source 21 forward as parallel light substantially parallel to the horizontal plane.

  The heat sink 23 has the same configuration as the heat sink 17 of the first unit 10 and is a metal member that radiates heat from the light source 21. The heat sink 23 includes a base 23a and a plurality of heat radiation fins 23b. The pedestal 23a has a flat surface 23c when extending in the vertical and horizontal directions, and the light source unit 21A including the light source 21 is directly provided on the flat surface 23c by screws or the like. The plurality of heat radiation fins 23b are flat plates extending in the front-rear and up-down directions behind the pedestal 23a.

  FIG. 3 is an exploded perspective view showing a fixing structure between the heat sink 17 of the first unit 10 and the heat sink 23 of the second unit 20. As shown in FIG. 3, the vehicular lamp 1 includes a metal pin 40 that is a cylindrical metal member, and the first unit 10 and the second unit 20 are connected by the metal pin 40.

  Specifically, each heat sink 17 and 23 has press-fit holes 17d and 23d into which the metal pins 40 are press-fit. The press-fit holes 17d and 23d are C-shaped holes that are formed so as to fill the base side of the pair of radiating fins 17b and 23b and open at the rear side. The press-fitting holes 17d and 23d are formed so as to penetrate from the upper end to the lower end of each heat sink 17 and 23 in the vertical direction. Further, the press-fitting holes 17d and 23d are formed to be slightly smaller than the diameter of the metal pin 40, and the heat sinks 17 and 23 are overlapped in the vertical direction when the metal pin 40 is press-fitted into the press-fitting holes 17d and 23d. It has a fixed structure. In particular, the metal pin 40 is formed of the same material as the heat sinks 17 and 23. That is, when the heat sinks 17 and 23 are made of aluminum, the metal pins 40 are also made of aluminum. The homogeneous member means a member basically composed of the same element, and the amount of other impurities may be the same or slightly different.

  Reference is now made to FIGS. As shown in FIGS. 1 and 3, the vehicular lamp 1 further includes a swivel mechanism 30, and the heat sinks 17 and 23 have rotation shaft holes 17e and 23e. The rotary shaft holes 17e and 23e are C-shaped holes formed so as to fill the base side of the pair of heat radiation fins 17b and 23b, like the press-fit holes 17d and 23d. , 23 is formed so as to penetrate from the upper end to the lower end in the vertical direction.

  The swivel mechanism 30 is configured to change the light emission direction in the left-right direction (horizontal direction) by a swivel motion that swings about the rotation axis. The swivel mechanism 30 includes a drive shaft 31 serving as a lower shaft, and a first shaft. The rotary shaft 32, the upper shaft 33, and the second rotary shaft 34 are included. The drive shaft 31 generates power that rotates around the axis with the electric power supplied from the outside as an axis. The drive shaft 31 is provided in contact with the lower end of the heat sink 17 of the first unit 10. The first rotating shaft 32 is a metal rod-like member whose lower end is connected to the drive shaft 31. The first rotating shaft 32 has a protruding portion 32a on the rear side, and the protruding portion 32a is fitted into the open side of the C-shaped rotating shaft hole 17e.

  The upper shaft 33 is a member provided at the upper end with a recess 33 a into which a projection (not shown) provided on the housing of the vehicle lamp 1 is fitted and whose lower end is in contact with the upper end of the heat sink 23 of the second unit 20. is there. The second rotating shaft 34 is a columnar member whose upper end is connected to the upper shaft 33. The second rotation shaft 34 is inserted into the rotation shaft hole 23e.

  Due to such a configuration, when the drive shaft 31 rotates around the axis, the first unit 10 and the second unit 20 also rotate around the axis, and the light emission direction is variable. Further, the drive shaft 31 and the upper shaft 33 are slightly larger in diameter than the rotary shafts 32 and 34 and function as restraining members that suppress the upper and lower ends of the two heat sinks 17 and 23.

  Next, the operation of the vehicular lamp 1 according to the present embodiment will be described. It is assumed that light is emitted from the light sources 11 and 21 in the vehicular lamp 1 shown in FIG. Thereby, heat is generated. Here, since the light sources 11 and 21 are installed on the bases 17a and 23a of the heat sinks 17 and 23, heat is transferred to the heat sinks 17 and 23 relatively quickly. And heat is transmitted to the radiation fins 17b and 23b, and is radiated from the radiation fins 17b and 23b.

  Here, the heat moves upward. For this reason, in the vehicular lamp described in Patent Document 1 and Patent Document 2, since the radiating fins extend downward, the released heat is trapped in the heat sink. However, in the heat sinks 17 and 23 according to the present embodiment, the pedestals 17a and 23a are plate members having flat surfaces 17c and 23c extending in the vertical and horizontal directions, and the plurality of radiating fins 17b and 23b are flat plates extending in the longitudinal and vertical directions. It is constituted by. Since it is such a structure, the heat | fever discharge | released from the radiation fins 17b and 23b will be suitably discharge | released from upper direction, without being interrupted | blocked by the bases 17a and 23a and the radiation fins 17b and 23b. Therefore, the heat dissipation performance is improved.

  Furthermore, since the metal pin 40 is the same material as the heat sinks 17 and 23, heat transfer is smooth between the heat sink 17 of the first unit 10 and the heat sink 23 of the second unit 20. For this reason, when the heat radiation amount of one heat sink 17 and 23 is large and the heat radiation amount of the other heat sink 17 or 23 is small, the heat radiation amount of both heat sinks 17 and 23 should be averaged and suitably radiated. It becomes.

  In the example shown in FIGS. 1 to 3, the pedestals 17a and 23a are plate members having flat surfaces 17c and 23c extending in the vertical and horizontal directions, and the plurality of radiating fins 17b and 23b are flat plates extending in the vertical and vertical directions. However, the present invention is not limited to this, and the pedestals 17a and 23a and the plurality of radiating fins 17b and 23b may be in other forms as long as the heat release structure releases the released heat upward. For example, in the example shown in FIGS. 1 to 3, the plurality of heat radiating fins 17 b and 23 b extend rearward from the pedestals 17 a and 23 a, but are not limited thereto, and may extend to the right rear and the left rear. Further, the plurality of heat radiating fins 17b and 23b may be flat plates extending in the front-rear and left-right directions, and the rear side may be inclined slightly upward. Further, the pedestals 17a and 23a may have a shape in which the upper side is slightly inclined forward or a shape in which the upper side is slightly inclined backward.

  Next, an assembly process of the first unit and the second unit 20 according to the present embodiment will be described. After completing the first unit 10 and the second unit 20, the operator first inserts the metal pin 40 into the press-fitting hole 17 d of the first unit 10. Next, the operator aligns the press-fitting hole 23d of the second unit 20 with the position of the metal pin 40 and pushes in the second unit 20 from above. Thereby, the 1st unit 10 and the 2nd unit 20 can be connected, without passing through processes, such as welding. In particular, since the heat sink 23 of the second unit 20 is a metal member, once it is connected by the metal pin 40, it is not easily detached due to the weight of the heat sink 23. That is, the connection state between the two is maintained without being easily disengaged even by vibration during vehicle travel.

  As described above, after connecting the first unit 10 and the second unit 20, the operator inserts the first rotation shaft 32 into the rotation shaft hole 17 e of the first unit 10 and moves the second rotation shaft 34. It fits in the rotation shaft hole 23e of the second unit. And these are assembled | attached to a housing. Thereby, the drive shaft 31 and the upper shaft 33 are clamped by the housing, the drive shaft 31 and the upper shaft 33 exhibit a function as a restraining member, and the connected heat sinks 17 and 23 are further less likely to come off.

  Thus, according to the vehicular lamp 1 according to the present embodiment, since the light sources 11 and 21 are provided on the bases 17a and 23a of the heat sinks 17 and 23, the light sources 11 and 21 and the bases 17a and 23a The weight can be reduced as compared with the case where a member is interposed therebetween. Further, since the heat sinks 17 and 23 have a heat release structure for releasing the released heat upward, the heat released by the heat radiation fins 17b and 23b smoothly escapes upward and is stored in the heat sinks 17 and 23. This prevents heat dissipation and improves heat dissipation. Therefore, the weight can be reduced and the heat dissipation can be improved.

  The pedestals 17a and 23a are plate members having a plane including at least the vertical direction, and the plurality of radiating fins 17b and 23b are configured by flat plates extending at least in the vertical direction. Thus, when both extend in the up-down direction, heat can easily escape upward as compared to the case where both or one extends obliquely upward, and the heat dissipation can be further improved.

  Further, the heat sinks 17 and 23 are fixed to each other by metal pins 40. For this reason, both can be connected, without passing through processes, such as welding. In particular, since the heat sink 23 of the second unit 20 is a metal member, once connected by the metal pin 40, the connection state between the two can be maintained without being easily detached due to the weight of the heat sink 23.

  In addition, since the metal pin 40 is the same material as the heat sinks 17 and 23, heat transfer between the heat sinks 17 and 23 is smooth, the amount of heat released from one heat sink 17 and 23 is large, and the heat sink 17 and 23 is released from the other heat sink. For example, when the amount of heat is small, the heat dissipation amounts of both heat sinks 17 and 23 are averaged to suitably dissipate heat.

  In addition, since the drive shaft 31 and the upper shaft 33 of the swivel mechanism 30 function as a restraining member, the connected heat sinks 17 and 23 can be further prevented from coming off.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention. For example, in the present embodiment, the press-fitting hole 16 has a diameter smaller than that of the metal pin 40, but the present invention is not limited to this and may be the same size.

  In the present embodiment, the metal pin 40 is separated from both the heat sinks 17 and 23. However, the present invention is not limited to this, and the metal pin 40 is provided integrally with the one heat sink 17 and 23, and the other Only the heat sinks 17 and 23 may have press-fitting holes 17d and 23d. Moreover, although the press-fit holes 17d and 23d penetrate the heat sinks 17 and 23 in the up-and-down direction, the configuration is not limited to this and may not be penetrated.

  Moreover, although the metal pin 40 connects the two heat sinks 17 and 23, it is not limited to this, and three or more heat sinks 17 and 23 may be connected. Similarly, the swivel mechanism 30 may be provided so as to swivel three or more heat sinks 17 and 23.

  In the present embodiment, a lamp having a vertical reflection structure in which light emitted from the light source 11 is reflected upward by the first reflector 12 and the reflected light is emitted forward by the second reflector 13 has been described. However, the present invention is not limited to this, and a lamp having a horizontal reflection structure that reflects light from the light source in the left direction or the right direction and then reflects the light toward the front may be used.

  Moreover, in this embodiment, although the 1st rotating shaft 32 and the 2nd rotating shaft 34 of the swivel mechanism 30 are separate bodies, it is not restricted to this, You may integrate.

It is a perspective view of the vehicular lamp which concerns on this embodiment. It is II-II sectional drawing of the vehicle lamp shown in FIG. It is a disassembled perspective view which shows the fixation structure of the heat sink of a 1st unit, and the heat sink of a 2nd unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lamp unit 10 1st unit 20 2nd unit 11, 21 Light source 12 1st reflector 13 2nd reflector 14 Shade 15 Lens 16 Blocking plate 17, 23 Heat sink 17b, 23b Base 17c, 23c Radiation fin 17d, 23d Press-fit hole 17e, 23e Rotating shaft hole 30 Swivel mechanism 31 Drive shaft 32 First rotating shaft 33 Upper shaft 34 Second rotating shaft 40 Metal pin

Claims (5)

A vehicular lamp that emits light from a light source in a predetermined direction,
A pedestal on which the light source is installed; and a plurality of radiating fins extending from the pedestal; and a heat sink that radiates heat from the light source through the pedestal through the plurality of radiating fins,
The heat sink has a heat release structure for releasing the released heat upward. The pedestal is a plate material having a plane extending at least in the vertical direction,
The vehicular lamp according to claim 1, wherein the plurality of heat dissipating fins are configured by flat plates extending at least in the vertical direction. A plurality of heat sinks;
At least two of the plurality of heat sinks have press-fitting holes into which metal pins are press-fitted,
The vehicular lamp according to claim 1, wherein the at least two heat sinks are fixed in a vertically overlapping manner by press-fitting the metal pin. The vehicular lamp according to claim 3, wherein the metal pin is formed of a member having the same quality as the at least two heat sinks. A swivel mechanism that varies the light emission direction in the horizontal direction by a swivel motion that swings about the rotation axis,
The at least two heat sinks each have a rotation shaft hole for receiving a rotation shaft of the swivel motion;
The lower ends of the at least two heat sinks are restrained by a first restraining member provided at the lower end of the rotating shaft,
5. The vehicular lamp according to claim 3, wherein upper ends of the at least two heat sinks are suppressed by a second suppression member provided at an upper end of the rotating shaft.

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