JP2018137203A - Vehicle lamp fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lamp fitting which directly cools a light source in addition to cooling utilizing a heat sink to effectively cool the light source.SOLUTION: A vehicle lamp fitting 1 includes: a light source 5; a heat sink 10 thermally connected to the light source at the back side of the light source 5; and a blower device 20 in which a blower part 27 is provided at the back side of the heat sink 10. A passage 18 which guides air blown by the blower part 2 so that the air is blown to the light source 5 is provided between the blower part 2 and the light source 5. At least part of the passage 18 is formed by the heat sink 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicular lamp including a light source, a heat sink thermally connected to the light source behind the light source, and a blower provided with a blower on the back of the heat sink.

  Conventionally, in the case of a small light source such as an LED, cooling using a heat sink is more effective than directly blowing air blown from the blower of the blower toward the light source. As described above, a method of directly blowing air to a light source and cooling has not been adopted.

  The vehicular lamp of Patent Document 1 includes a heat sink disposed behind the light source, and further a blower disposed behind the heat sink. In order to enhance the heat dissipation of the heat sink, the heat of the light source The air is blown from the blower toward the heat sink where the heat is transmitted.

  However, since it has been found that a certain effect can be obtained even when the air is directly blown to the light source, there is room for devising a method for cooling the light source more efficiently than simply cooling the heat sink.

JP 2010-254099 A

  Accordingly, an object of the present invention is to effectively cool a light source by directly cooling a light source in addition to cooling using a heat sink.

  The present invention provides a vehicle lamp comprising a light source, a heat sink thermally connected to the light source behind the light source, and a blower device provided with a blower unit behind the heat sink. A flow path for guiding the air blown from the blower section to blow out toward the light source is provided between the light source and the light source, and at least a part of the flow path is formed by the heat sink It is.

  According to the above configuration, the light source can be effectively cooled by directly cooling the light source in addition to the cooling using the heat sink.

  Here, the front indicates the irradiation direction of the light source, the back indicates the opposite direction to the irradiation direction, and the front-rear direction indicates a direction parallel to the optical axis of the light source.

  As an aspect of the present invention, with respect to the light source, the air blowing section is provided outside in the cross direction intersecting the optical axis extending forward of the light source, and the flow path is a front-rear direction flow extending forward from the air blowing section. It is formed in a duct shape including a road portion and a direction changing flow path portion that changes the blowing direction of the air flowing through the front-rear direction flow path portion to the inside of the crossing direction.

  According to the said structure, since the said flow path was formed in the duct shape, the air ventilated from the ventilation part flows ahead along the front-back direction flow path part, and disperse | distributes when changing a direction in a direction change flow path part. The air can be reliably blown out toward the light source without any problem.

  Further, as an aspect of the present invention, a light source array unit is provided in which a plurality of the light sources are provided and the plurality of light sources are arranged in a row on an intersecting surface intersecting the optical axis, and the outlet of the flow path Is provided at a position where it blows out from the direction intersecting the longitudinal direction of the plurality of light source array portions toward the center of the light source array portion in the longitudinal direction.

  According to the above configuration, among the plurality of light sources, the temperature increases as the distance from the center portion in the longitudinal direction of the light source array portion (that is, the light source array direction) increases, so the blowing portion faces the center in the longitudinal direction of the light source array portion. By providing at the position to blow out, it is possible to effectively cool the light source that is likely to become the highest temperature and needs to be cooled.

  Moreover, as an aspect of the present invention, the outlet of the flow path is provided below the light source.

  According to the said structure, although the air of the periphery rises with the heat | fever of a light source, air can be blown upwards toward a light source by providing the blowing part of the said flow path below the light source. Accordingly, the flow of heat rising with respect to the light source is not hindered, and the increase is further promoted, so that the light source can be effectively cooled.

  Further, as an aspect of the present invention, an opening that communicates with each side of the crossing part in the extending direction of the flow path is formed in a part of the heat sink that crosses the flow path. At least a part of the extending direction of the path is formed by the opening.

  According to the above configuration, the flow path is not provided around the heat sink (base portion) interposed between the light source and the air blower in the front-rear direction from the outside in the cross direction, and through the opening formed in the heat sink. Since it can provide in a shorter distance, the air ventilated from the ventilation part can be blown off firmly toward a light source.

  In addition, at least a part of the extending direction of the flow path is formed by an opening formed in the heat sink. That is, since the edge of the opening is formed by a part of the heat sink, the heat dissipation effect of the heat sink can be enhanced by the air flowing through the flow path.

  As an aspect of the present invention, the heat sink is provided with a plurality of radiating fins extending in the front-rear direction, and a part of the flow path is formed between the adjacent radiating fins by connecting the radiating fins to the flow path wall. It is formed with a closed cross-section.

  According to the above configuration, the air flowing through the flow path can exchange heat with the heat dissipating fins that form the wall surface of the flow path. It can be compatible.

  According to the present invention, the light source can be effectively cooled by directly cooling the light source in addition to the cooling using the heat sink.

The longitudinal cross-sectional view of the vehicle lamp of 1A Embodiment. The perspective view of the principal part of the vehicle lamp of 1A embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. The external view (a) which shows the principal part of an air blower, the BB line expanded sectional view (b) in FIG. The graph which shows the temperature change according to the wind speed in each part of LED, a board | substrate, and a heat sink. The rear view and front view which show typically the temperature distribution of a board | substrate. The figure corresponding to FIG. 3 which shows the principal part of the vehicle lamp of 1B embodiment. The figure corresponding to FIG. 1 explaining the further another example of 1B Embodiment. The longitudinal cross-sectional view of the vehicle lamp of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(1A embodiment)
FIG. 1 is a partial longitudinal cross-sectional view of the vehicle lamp in the vehicle width direction according to the first embodiment, and is a cross-sectional view of the vehicle lamp according to the present embodiment corresponding to the line CC in FIG. 2 is a perspective view of a main part of a lamp unit provided in the vehicular lamp according to the first embodiment, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 4A is a main part of the blower. FIG. 4B is an enlarged sectional view taken along the line BB in FIG.

  The vehicular lamps 1 and 1 according to the present embodiment are used as fog lamps arranged on the left and right of the front part of the vehicle, and the basic configuration is the same on the left and right. Only 1 will be described. In the figure, arrow F indicates the front of the vehicle, arrow W indicates the vehicle width direction, and arrow U indicates the vehicle upper direction. In the present embodiment, it is assumed that the irradiation direction of the LED 5 as the light source provided in the vehicular lamp 1 coincides with the front of the vehicle.

  A vehicular lamp 1 according to the present embodiment includes a concave lamp housing (not shown) that opens forward, and a transparent outer lens 2 that covers the front opening as shown in FIG. An internal space defined by the lamp housing and the outer lens 2 is formed as a lamp chamber 3.

  As shown in FIG. 1, a lamp unit 4 is disposed in the lamp chamber 3. As shown in FIGS. 1 to 3, the lamp unit 4 includes a projection lens 32, a lens holder 33 that holds the projection lens 32, an LED 5 as a light source, and a flat copper substrate 6 on which the LED 5 is mounted. And a heat sink 10 thermally connected to the LED 5 and a blower device 20 provided with a blower opening 27 as a blower.

  The lens holder 33 includes a cylindrical portion 34 formed in a cylindrical shape. In a state where the lens holder 33 is attached to the front portion of the heat sink 10 as described later, the rear end of the cylindrical portion 34 is the front extension portion 1. It arrange | positions ahead of the front extension part 13 of the heat sink 10 in the state contact | abutted to the front end.

  A plurality of locking leg portions 35 that are locked to the heat sink 10 are disposed in predetermined circumferential portions of the rear portion of the cylindrical portion 34. The locking leg 35 protrudes inward in the radial direction so that its base part bypasses the front extension part 13 from the rear end of the cylindrical part 34 and bends so that the tip part is directed backward, and the tip part (rear part) Is protruded rearward from a base portion 11 to be described later of the heat sink 10, and a locking claw 35a that can be locked to the heat sink 10 side is provided at the tip portion.

  The projection lens 32 is formed in a substantially hemispherical shape convex forward, and the rear end portion is attached to the front end of the cylindrical portion 34 so as to face the outer lens 2 behind the outer lens 2.

  The substrate 6 is disposed so as to be orthogonal to the front-rear direction (that is, facing the outer lens 2), and as shown in FIG. 3, the front surface 6f of the substrate 6 is viewed from the front (that is, viewed from the outer lens 2 side). The part is provided with a plurality of LEDs 5 in order to widen the irradiation range, and all of them are attached so as to face forward (that is, the optical axis X coincides with the front-rear direction).

  The plurality of LEDs 5 are arranged in a row extending in the vehicle width direction, and the light source array portion 30 (30u, 30d) is configured by these LEDs 5. The number and arrangement of the LEDs 5 are appropriately set according to the luminance required for the vehicular lamp 1, and in this example, the two light source array portions 30 are arranged on the front surface 6f of the substrate 6 in parallel with each other on the upper and lower sides. Has been implemented. An LED module 31 is formed by these two light source array portions 30, of which nine LEDs 5 are provided in the upper light source array portion 30 u and 12 LEDs 5 are provided in the lower light source array portion 30 d. Arranged in an array pattern.

  The heat sink 10 is formed of aluminum or an aluminum alloy, and is disposed on the back side of the substrate 6. The base 11 extends radially outward with respect to the LED module 31, and the radial direction of the base 11 (that is, the optical axis X). And the heat dissipating part 12 provided in the outer portion in the direction intersecting with. The substrate 6 is attached to the base 11 by, for example, being attached to the front surface of the base 11 through an adhesive having thermal conductivity such as Si conductive grease (not shown). As a result, the base 11 receives heat from the LED 5 through the substrate 6 and radiates the heat at the base 11 itself and conducts heat to the heat radiating part 12.

  The blower device 20 is provided behind the base 11, and the blower opening 27 provided in the blower device 20 is provided behind the heat radiating unit 12.

  The heat dissipating part 12 is provided over the entire circumference except for the lower part at least in a radially outer part than the LED module 31, that is, in a radially outer edge of the base 11.

  As shown in FIG. 3, the heat radiating portion 12 is formed in a substantially C shape in a front view in which a cylindrical lower portion extending substantially in the front-rear direction is opened downward. A lower opening 7 (see FIG. 1) that opens toward the lower side of the heat radiating part 12 is formed in the lower part of the heat sink 10.

  As shown in FIGS. 1 and 2, the heat dissipating part 12 includes a front extending part 13 that extends forward to the front of the outer lens 2 with respect to the base part 11, and a rear extending part 14 that extends rearward. It has. The front extending portion 13 is extended so that the front end thereof is positioned in front of the LED 5. Thereby, the front extension part 13 is arrange | positioned so that the board | substrate 6 (LED module 31) may be enclosed in the circumferential direction except a lower part.

  A space surrounded by the front extension 13, that is, a space radially inward of the front extension 13 is configured as a lens holder insertion space 10 </ b> B into which the locking leg portion 35 of the lens holder 33 is fitted ( (See FIGS. 1 and 3).

  As shown in FIG. 1, in a state in which the locking leg portion 35 of the lens holder 33 is fitted in the lens holder insertion space 10 </ b> B, the locking leg portion 35 extends rearward from the base portion 11. A locking leg portion insertion hole 11b through which the locking leg portion 35 is inserted is penetrated in a part corresponding to the stopping leg portion 35 in the front-rear direction. Further, a portion corresponding to the locking leg 35 on the inner peripheral surface of the rearward extending portion 14 of the heat radiating portion 12 (a heat radiating portion main body to be described later) is locked to a locking claw 35a (not shown) that can be locked with the locking claw 35a. Is provided.

  Then, when the locking leg 35 of the lens holder 33 is fitted into the lens holder insertion space 10B from the front, the locking claw 35a and the covered claw 35a are covered with the locking leg 35 inserted into the locking leg insertion hole 11b. The lens holder 33 can be mounted on the front portion of the heat sink 10 and the projection lens 32 is disposed between the outer lens 2 and the LED 5 in the front-rear direction. (See FIG. 1).

  The rear extending portion 14 extends rearward with respect to the base portion 11 so as to have a longer front and rear length than the front extending portion 13. The rear extension 14 and the base 11 define a heat sink internal space 10A that opens rearward and downward in the radial inner side of the rear extension 14 and on the back of the base 11.

  In other words, the heat dissipating part 12 is integrally formed of a heat dissipating part main body 15 located radially inside and a plurality of heat dissipating fins 16 standing radially outward from the heat dissipating part main body 15. ing.

  As shown in FIG. 3, the heat dissipating part main body 15 is continuously formed with substantially the same thickness (plate thickness) in the circumferential direction of the heat dissipating part 12. As shown in FIG. 1, the heat dissipating part main body 15 extends continuously in the front-rear direction over the entire length excluding the front end of the front extending part 13 in the front-rear direction of the heat dissipating part 12. The corresponding portion is formed to have a smaller diameter than the portion corresponding to the rearward extending portion 14.

  The heat radiating fins 16 extend linearly in the front-rear direction on the outer peripheral surface of the heat radiating unit main body 15 and are arranged at an equal pitch in the circumferential direction.

  The radiating fin 16 is in contact with the rear end of the cylindrical portion 34 of the lens holder 33 in a state where the locking leg portion 35 of the lens holder 33 is fitted in the lens holder fitting space 10B in the front extending portion 13. It protrudes further forward than the front end of the heat dissipating part main body 15. In addition, the front end part of the radiation fin 16 is formed so that the radial thickness is gradually reduced so as to taper forward (see FIG. 1).

  That is, the radiating fin 16 continuously extends over the entire length of the radiating portion 12 in the front-rear direction (see FIG. 1), and has the same thickness (t16) regardless of the front extending portion 13 and the rear extending portion 14. It is formed (see FIG. 3).

  The radiating fins 16 are provided so that the protruding length in the radial direction is longer on the rear extending portion 14 side than on the front extending portion 13 side (see FIG. 1). Furthermore, the radiating fin 16 has a protruding length (radial length) (h16) longer than the thickness (plate thickness) (t11) of the base 11 on either side of the front extending portion 13 and the rear extending portion 14. ) (See FIG. 1).

  As shown in FIGS. 1 and 3, the base 11 is formed thicker than each of the heat radiating body 15 and the heat radiating fins 16 (t11> t15, t16), but the thickness of the base 11 ( t11) is provided so as to be less than twice the plate thicknesses (t15, t16) of the heat dissipating part main body 15 and the heat dissipating fins 16. In the present embodiment, the thickness (t16) of the radiating fins 16 is set to 2 mm while the plate thickness (t11) of the base 11 is 4 mm.

  Between the heat radiating fins 16 and 16 adjacent in the circumferential direction of the heat radiating part 12, a flow path 17 is configured to guide the wind blown from the air blowing opening 27 forward along the heat radiating part extending in the front-rear direction.

  As shown in FIG. 3, a plurality of the flow paths 17 are provided in portions corresponding to the space between the heat radiation fins 16 and 16 in the circumferential direction of the heat radiation portion 12, and each flow path 17 blows heat from the heat radiation portion 12. It extends linearly in the front-rear direction from the front end to the rear end of the heat dissipating part 12 so as to dissipate the air (air) blown from the opening 27.

The flow path 17 is formed in a concave shape that is recessed inward in the radial direction with respect to the front end of the heat radiating fin 16 in an orthogonal cross-sectional view in the front-rear direction, and has an opening 17a that is open in the radial direction (see FIG. ).
That is, in the flow path 17, both side walls are formed by the heat dissipating fins 16, 16 adjacent in the circumferential direction of the heat dissipating part 12, and the diameter of the heat dissipating part main body 15 located between these adjacent heat dissipating fins 16, 16. A concave bottom surface is formed by the outer surface 15a.

  Here, among the plurality of flow paths 17 provided in the circumferential direction of the heat radiating section 12, in the present embodiment, the flow path 17 located at the uppermost part of the heat radiating section 12 is used to send the air blown from the air blowing opening 27 to the LED 5. It is provided as a light source air guide path 18 to be directed (see FIG. 3).

  As shown in FIG. 1, the light source air guide path 18 is in front of the air blowing opening 27 and the LED 5 so as to blow out the air blown from the air blowing opening 27 toward the LED 5 (in the present embodiment, the nearest part above the LED 5). Between the rear end of the heat dissipating part 12 (that is, the air blowing opening 27) and extending in the front-rear direction to the front part of the front-rear direction from the base 11 to the part corresponding to the LED 5 in the front-rear direction. The direction change flow path portion 18b for changing the air blowing direction from the front to the radial inner side (LED5 side) at the front end of the direction flow path portion 18a, and downward from the radial outer side to the front of the LED 5 on the radial inner side with respect to the LED5 It is formed in a duct shape with the extending radial direction flow path part 18c.

  The front-rear direction flow path portion 18a is formed by closing the opening 17a that opens radially outward (upward) in the flow path 17 with the closing plate 180a over the entire length in the front-rear direction of the front-rear direction flow path portion 18a. The flow path 17 is formed in a duct shape that has a closed cross-sectional space and extends in the front-rear direction. The closing plate 180a is disposed so as to straddle between the adjacent radiation fins 16 and 16 constituting the light source air guide path 18 in the circumferential direction.

  The direction change flow path portion 18b is formed by a shielding plate 180b that shields wind from flowing further forward at the front end of the front-rear direction flow path portion 18a, that is, the portion corresponding to the LED 5 in the front-rear direction of the flow path 17. Has been. The shielding plate 180b is arranged in a vertical wall shape orthogonal to the front-rear direction.

  As a result, the wind w flowing forward through the front-rear direction flow path portion 18a is redirected downward by contacting the shielding plate 180b in the direction change flow path portion 18b (see FIG. 1). In the present embodiment, the shielding plate 180b and the closing plate 180a are integrally formed of a thermosetting resin.

  As described above, both of the front-rear direction flow path portion 18 a and the direction change flow path portion 18 b in the light source air guide path 18 are formed by the heat sink 10. That is, the front-rear direction flow path portion 18a is formed by the heat sink 10 and the shielding plate 180b, and the direction change flow path portion 18b is formed by the heat sink 10 and the closing plate 180a in cooperation.

  The radial flow path portion 18c extends downward from the direction change flow path portion 18b to a position just above the center portion Lc in the longitudinal direction L (vehicle width direction) of the light source arrangement portion 30 (see FIG. 3). At the lower end portion of the radial flow path portion 18c, an air outlet that blows wind from above the upper light source array portion 30u (a direction intersecting the longitudinal direction) toward the center portion Lc in the longitudinal direction L of the light source array portion 30. 181 is provided.

  The radial flow path portion 18c extends downward from the direction change flow path portion 18b to the blowout port 181. In the meantime, each of the heat radiating portion main body 15 and the locking leg portion 35 is disposed (see FIG. 1). As shown in FIGS. 1 and 3, the portions of the heat dissipating portion main body 15 and the locking leg portion 35 that are crossed by the radial flow passage portion 18 c are on the respective sides of the radial flow passage portion 18 c with respect to the crossing portion. Openings 19a and 19b communicating with each other are formed so as to penetrate each other (see FIG. 1). In addition, in FIG. 3, illustration of the latching leg part 35 and the opening part 19b is abbreviate | omitted.

  As described above, since the radial flow path portion 18c is formed by the peripheral edge of the opening 19a provided in the heat radiating section main body 15, the front-rear flow path portion 18a and the direction change flow path also for this radial flow path portion 18c. A part of the heat sink 10 is formed in the same manner as the portion 18b.

  Further, the radial flow path portion 18c communicates from the direction change flow path portion 18b to the blowout port 181 through the openings 19a and 19b provided in the heating portion main body 15 and the locking leg portion 35, but from the openings 19a and 19b. Between the outlets 181, a guide plate 180 c for guiding the wind w is provided. The guide plate 180c is also formed of a thermosetting resin, and is formed in a duct shape in cooperation with the front surface of the base 11 and the front surface 6f of the substrate 6.

  As shown in FIG. 1, the air blower 20 is attached to the heat sink 10 in a state of being fitted into the heat sink internal space 10A from the rear opening of the heat sink 10, and the piezo fan unit 21 and the piezo fan unit 21 are accommodated. It is comprised with the housing | casing 22 made.

  As shown in FIGS. 1 and 4A, the housing 22 is composed of a housing 23 and a back cover 24. The housing 23 is fitted into the heat sink internal space 10A, the front surface 23f is closed, and the rear side is It is formed in a bottomed cylindrical shape having an open internal space 23A.

  The back cover 24 is formed in a bottomed cylindrical shape having a shallower bottom than the housing 23 having an inner space 24A having a rear surface 24r closed and a front opening. An opening is formed in the center of the front surface 24f of the back cover 24. The internal space 23 </ b> A of the housing 23 and the internal space 24 </ b> A of the back cover 24 communicate with each other in the front-rear direction to form an internal space 22 </ b> A of the housing 22.

  On the outer peripheral portion of the back cover 24, a flange portion 25 is provided in which the entire circumferential direction protrudes radially outward from the outer diameter of the housing 23 so that the rear end surface 10r of the heat sink 10 can be engaged from behind.

  An annular front surface 25a of the flange portion 25 is formed by a radially outer portion with respect to an opening provided in a central portion of the front surface 24f of the back cover 24, and the inner space 22A of the housing 22 and the outside of the housing 22 are formed. A plurality of blower openings 27 opened rearward so as to communicate with each other are disposed in the circumferential direction (see FIGS. 1 to 4A). As shown in FIG. 3, the plurality of air blowing openings 27 are provided in a portion corresponding to the flow path 17 in the circumferential direction of the heat radiating portion 12 (that is, a portion corresponding to between the adjacent heat radiating fins 16, 16). The air blown from the piezo fan unit 21 disposed in the housing 22 is jetted from the blower opening 27.

  Further, as shown in FIG. 4B, a bolt insertion hole 25c is formed at a predetermined portion in the circumferential direction of the flange portion 25 of the back cover 24, and the bolt insertion in the circumferential direction of the rear end surface 10r of the heat sink 10 is performed. A bolt insertion hole 10c is also formed in a portion corresponding to the hole 25c, and the blower 20 is attached using a bolt B1 or the like with the flange portion 25 engaged with the rear end surface 10r of the heat sink 10.

  The piezo fan unit 21 is a known fan that generates wind by utilizing the reverse voltage effect of the piezo. Although not shown, a piezo (piezoelectric element) and a blade shape connected to the piezo in a cantilever manner. And an AC voltage applying means for exciting the air blowing plate by applying an AC voltage to the piezo and vibrating the front end (free end) of the air blowing plate in the thickness direction. . In this embodiment, as shown in FIG. 1, the piezo fan unit 21 is installed in the internal space 22 </ b> A of the housing 22 so as to generate wind toward the rear by vibration of the blower plate.

  Thereby, the air blower 20 flows inside the housing 22 so that the air blown from the piezo fan unit 21 once hits the rear surface 24r of the back cover 24 and then wraps around radially outward (flange portion 25 side). It is configured to jet from the blower opening 27.

  Further, as shown in FIG. 1, the lower opening 7 described above is provided behind and below the base 11 of the heat sink 10 described above, and the heat sink 10 has a plate shape so as to close the lower opening 7. The lower extension piece 110 is further provided. The lower extension piece 110 is formed integrally with the base portion 11 and extends rearward from the lower portion of the base portion 11.

  And the heat sink 10 mentioned above is attached with the volt | bolt B2 etc. in the state installed in the lamp unit base part 100 which has the heat insulation which the lower extension piece 110 was provided in the lamp body part side not shown.

  Thus, although the heat sink 10 is attached to the lamp unit base portion 100, the LED 5 and the substrate 6 are attached to the base 11, and the blower 20 is attached to the heat dissipation portion 12, so that the LED 5 and the substrate 6 are attached. The air blower 20 is also attached to the base unit of the lamp unit 4 via the heat sink 10.

  The air blower 20 is not limited to the configuration attached to the lamp unit base portion 100 via the heat sink 10 as described above, but includes a configuration directly attached to the lamp unit base portion 100 without using the heat sink 10 or both. In other words, a configuration including both an attachment portion to the heat sink 10 and an attachment portion to the lamp unit base portion 100 may be employed.

  The vehicle lamp 1 according to the present embodiment described above includes an LED 5 as a light source, a heat sink 10 thermally connected to the LED 5 at the back of the LED 5, and a ventilation opening as a blower at the back of the heat sink 10. A light source air guide path 18 for guiding the air blown from the blower opening 27 toward the LED 5 between the blower opening 27 and the LED 5. At least a part of the air guide path 18 is formed by the heat sink 10.

  According to the above configuration, the LED 5 can be effectively cooled by directly cooling the LED 5 in addition to the cooling using the heat sink 10.

  Specifically, since at least a part of the light source air guide path 18 that guides the air blown from the blower opening 27 toward the LED 5 is formed by the heat sink 10, the air is blown from the blower opening 27. The air can also contribute to heat dissipation of the heat sink 10 when flowing through the light source air guide path 18.

  And since the air which flows through the light source air guide path 18 is sufficiently low with respect to the temperature of LED5 even if it heats by heat dissipation of the heat sink 10, the cooling effect of LED5 can also be acquired by blowing toward LED5.

  FIG. 5 shows the state of temperature change according to the wind speed blown from the blower opening 27 in each part of the LED 5, the substrate 6, and the heat sink 10, and the waveform 15 shown by the solid line in FIG. The LED 5 positioned in the vicinity of the center Lc in the direction L, similarly, the waveform l6 indicated by a broken line is the back surface of the substrate 6, and the waveform l10 indicated by the alternate long and short dash line is a temperature change in the base 11 of the heat sink 10 according to the respective wind speeds. Indicates.

  As shown in FIG. 5, the LED 5 is cooled by using the heat sink 10 as in this embodiment because the temperature is steadily decreasing as the wind speed increases so as to be linked to the temperature change of the substrate 6 and the heat sink 10. In addition to the above, it was confirmed that the LED 5 was effectively cooled by directly cooling the LED 5.

  As an aspect of the present invention, the LED 5 is provided with a blower opening 27 on the outer side in the intersecting direction intersecting the optical axis X of the LED 5, and the light source air guide path 18 extends forward and backward from the blower opening 27. Part 18a, direction change flow path part 18b for changing the blowing direction of the air flowing through the front-rear direction flow path part 18a from the front to the radial inner side, and the radial flow extending from the radially outer side toward the radially inner LED 5 It is formed in a duct shape by the path portion 18c (see FIGS. 1 and 3).

  According to the above configuration, since the light source air guide path 18 is formed in a duct shape, the air blown from the blower opening 27 flows forward along the front-rear direction flow path portion 18a and changes direction in the direction change flow path portion 18b. Then, the air can be reliably blown out toward the LED 5 without being dispersed when flowing toward the LED 5 along the radial flow path portion 18c.

  Further, as an aspect of the present invention, a light source array section 30 is provided in which a plurality of LEDs 5 are provided and the plurality of LEDs 5 are arranged in a row on an intersecting surface intersecting the optical axis X. The air outlet 181 toward the LED 5 is at a position where it blows downward from the upper position intersecting the longitudinal direction L of the plurality of light source array sections 30 toward the center Lc of the light source array section 30 in the longitudinal direction L. This is provided (see FIG. 3).

  According to the above configuration, as shown in FIGS. 6 (a) and 6 (b), the plurality of LEDs 5 become hot as they approach the central portion Lc in the longitudinal direction L of the light source array portion 30. By providing at the position where it blows out toward the central portion Lc in the longitudinal direction L of the array portion 30, the LED 5 that is particularly required to be cooled because of the highest temperature can be effectively cooled.

  6A is a rear view of the substrate 6 showing the temperature distribution of the substrate 6 heated by the LED 5, and FIG. 6B is an enlarged view of the upper portion of the front surface 6f of the substrate 6. In FIGS. 6A and 6B, the density of dots is changed according to the temperature band, and the denser the dots, the higher the temperature.

  Further, as an aspect of the present invention, a portion of the heat sink 10 (heat radiating portion main body 15) that crosses the light source air guide path 18 (radial flow path portion 18c) is crossed in the extending direction of the radial flow path portion 18c. In contrast, an opening 19a communicating with each side is formed, and at least a part of the extending direction of the radial flow path portion 18c is formed by the opening 19a (see FIG. 1).

  According to the said structure, since it can provide in the shortest distance through the opening part 19a drilled in the heat sink 10, the air ventilated from the ventilation opening 27 can be blown off firmly toward LED5.

  Moreover, since the opening 19 a is formed in the heat sink 10, that is, the edge of the opening 19 a is formed by a part of the heat sink 10, the heat dissipation effect of the heat sink 10 is exerted by the air flowing through the light source air guide path 18. Can be increased.

  The heat sink 10 is provided with a plurality of heat radiation fins 16 extending in the front-rear direction, and a part of the light source air guide path 18 (front-rear direction flow path portion 18 a) is disposed between the adjacent heat radiation fins 16, 16. It is formed with a closed cross section having the radiation fins 16 as side walls (see FIGS. 1 and 3).

  According to the above configuration, the air flowing through the front-rear direction flow path part 18a can be heat exchanged with the heat radiation fins 16 forming the side walls of the front-rear direction flow path part 18a. The cooling of the LED 5 by the heat radiation of the part 12 can be made compatible.

  Next, vehicle lamps 1B and 1C according to other embodiments will be described. However, the same components as those of the vehicular lamp 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

(1B embodiment)
FIG. 7 is a conceptual diagram showing the main part of the lamp unit 4B provided in the lamp chamber 3 of the vehicular lamp 1B according to the 1B embodiment in a central longitudinal section in the vehicle width direction.

  In the lamp unit 4B of the first B embodiment, a predetermined flow channel 17 positioned on the lower side among the plurality of flow channels 17 provided in the circumferential direction of the heat radiating unit 12 is provided as the light source air guide path 18B. .

  The radial flow path portion 18c in the light source air guide path 18B is formed from the lower surface of the LED module 31 and from the outer side in the vehicle width direction toward the center portion Lc in the longitudinal direction L (vehicle width direction) of the light source arrangement portion 30. The upper end portion of the light source array portion 30 extends laterally from the lower light source array portion 30d toward the center portion Lc in the longitudinal direction L (vehicle width direction) of the light source array portion 30, that is, downward in this example. The blower outlet 181 which blows off a wind from is provided.

  Also in the present embodiment, the radial flow path portion 18c extends upward from the direction change flow path portion 18b to the air outlet 181 and inward in the vehicle width direction, and the heat radiating portion main body 15 is disposed therebetween. An opening 19a that communicates with each side of the radial flow path portion 18c with respect to the crossing portion is formed through the portion where the radial flow path portion 18c crosses in the heat radiating portion main body 15.

  Further, the radial flow path portion 18c includes a guide plate 180c for guiding wind from the opening portion 19a to the air outlet 181. The guide plate 180c cooperates with the front surface 6f of the substrate 6 and the front surface of the base portion 11 to form a duct shape. Is formed.

  Like the vehicular lamp 1B according to the above-described 1B embodiment, by providing the air outlet 181 of the light source air guide path 18B on the lower side of the LED 5, air can be blown upward toward the LED 5. Thereby, the heat generated from the LED 5 does not hinder the flow of heat that is going to rise, but rather the LED 5 can be effectively cooled by further promoting the rise in heat.

  By the way, in the vehicular lamps 1, 1 </ b> B of the above-described embodiment, as shown in FIGS. 3 and 7, the radiating fins 16 are arranged in the circumferential direction except the lower part of the radiating part 12, and the lower part of the substrate 6. However, the present invention is not limited to this embodiment. For example, the heat dissipating part 12 is disposed on the entire periphery including the lower part of the heat sink 10 and the substrate 6 is disposed below. An embodiment that fits on the front surface of the base 11 without extending to the front may be employed.

  In this embodiment, as shown in FIG. 8, in the circumferential direction of the heat dissipating part 12, the flow path 17 having the lowest position among the plurality of flow paths 17 formed by the adjacent heat dissipating fins 16, 16 is provided. It can be configured as a part of the light source air guide path 18C.

  Thereby, the radial direction flow path part 18c in the light source air guide path 18C extends from the flow path 17 at the lowest position in the circumferential direction of the heat dissipation part 12 to the center part Lc in the longitudinal direction L (vehicle width direction) of the light source arrangement part 30. It can be extended substantially linearly in the up-down direction along the front surface 6f of the substrate 6.

  Therefore, in this embodiment as well as the vehicular lamp 1B of the above-described embodiment, the longitudinal direction L (vehicle width direction) of the light source array unit 30 from the air outlet 181 located below the lower light source array unit 30d. Wind can be blown out toward the center portion Lc, and the radial flow path portion 18c can extend upward substantially straight without detouring in the vehicle width direction.

  Therefore, it is possible to cool the LED 5 effectively by blowing air from the air outlet 181 to the LED module 31 using the rising airflow of the air received from the heat sink 10 in the process of flowing through the front-rear direction flow path portion 18a. it can.

  In addition to the embodiment described above, a predetermined flow path 17 among a plurality of flow paths 17 configured in the circumferential direction of the heat radiating section 12 may be configured as a part of the light source air guide path 18. However, the number of the light source air guide paths 18 is not limited to one. Furthermore, the configuration is not limited to the configuration including all of the front-rear direction flow path portion 18a, the direction change flow path portion 18b, and the radial direction flow path portion 18c as long as the configuration can direct the wind toward the LED 5. The path portion 18c may be omitted.

(Second Embodiment)
FIG. 9 is a conceptual diagram showing the main part of the lamp unit 4D provided in the lamp chamber 3 of the vehicular lamp 1D according to the second embodiment in a central longitudinal section in the vehicle width direction.

  Also in the lamp unit 4D of the second embodiment, a projection lens 32 having a center portion in front view convex forward is disposed between the front and rear directions of the LED 5 and an outer lens (not shown), and behind the substrate 6D. The heat sink 10D thermally connected to the LED 5 and the blower 20D provided with the blower opening 27D are provided.

  The heat sink 10 is integrally formed of a base 11D disposed so as to be thermally connected to the LED 5 on the back of the substrate 6D and a plurality of heat dissipating fins 16D by a heat conducting member such as copper.

  The base 11D is formed in a plate shape having a surface orthogonal to the front-rear direction. Moreover, the radiation fin 16D is formed in a horizontal plate shape having a surface orthogonal to the vertical direction, and extends linearly and horizontally from the rear surface of the base portion 11D to the rear. Further, each of the plurality of radiating fins 16D is arranged in an up-down direction with a predetermined interval and arranged at an equal pitch.

  That is, a gap 17D extending in the front-rear direction is formed between the plurality of radiation fins 16D and 16D, with the rear end opened and the front end closed by the rear surface of the base.

  As shown in FIG. 9, the air blower 20D has substantially the same size as the heat sink 10D when viewed from the front, and is disposed on the back of the heat sink 10D toward the heat sink 10D. That is, the air blower 20 is a propeller that pumps air toward the front, that is, the heat sink 10D by rotating around a rotation axis by a motor (not shown) having a blower opening 27D that is open on the entire front surface and a motor 22 (not shown). And a cooling fan unit 21D provided with

  In the lamp unit 4D of the second embodiment, the central axis of the projection lens 32, the optical axis X of the LED 5, the front center part of the heat sink 10D, and the rotational axis of the cooling fan unit 21D are parallel and coaxial with the front-rear direction. Each is arranged to be.

  Here, between the heat radiation fins 16D and 16D of the heat sink 10D described above, a gap 17D extending in the front-rear direction with the rear end opened is formed. In the process of flowing in the front-rear direction, the heat sink 10D dissipates heat to the air. Therefore, in this embodiment, the gap is configured as the flow path 17D.

  In this way, the heat sink 10D is provided with a plurality of flow paths 17D in the vertical direction. Among the plurality of flow paths 17D, a predetermined flow path 17Da located radially outside of the LED 5 is used as a light source. It is configured as a part of the air guide path 18D.

  Specifically, the light source air guide path 18 includes a front / rear direction flow path portion 18a that extends forward from the rear end of the heat sink 10D to a portion corresponding to the LED 5 in the front / rear direction, and an air blowing direction from the front to the radially inner side (LED 5 The direction changing flow path portion 18b to be changed to the side of the LED and the radial flow path portion 18c extending downward from the radially outer side to the front side of the radially inner LED with respect to the LED are formed in a duct shape.

  A portion of the base portion 11D corresponding to the front end of the predetermined flow path 17Da is formed with an opening portion 11Da penetrating in the front-rear direction (plate thickness direction). The opening 11Da is formed so that one side and the other side communicate with the base 11D at a portion where the light source air guide path 18 crosses the base 11D.

  By providing the opening 11Da in the base 11D in this way, the light source air guide path 18D is detoured from the outside in the radial direction with respect to the base 11D of the heat sink 10 interposed between the LED 5 and the air blowing opening 27 in the front-rear direction. Since it can provide in shortest distance through this opening part 11Da without providing, it can blow out the air ventilated from the ventilation opening 27 toward LED5 firmly.

  Further, the front-rear direction flow path portion 18a is formed by using the edge portion of the opening 11Da of the base portion 11D and the radiation fins 16D and 16D constituting the predetermined flow path 17Da as flow path walls. That is, a part of the light source air guide path 18 is formed by the heat sink 10D.

  The direction change flow path portion 18b and the radial direction flow path portion 18c include a guide member 180 formed integrally with a thermosetting resin (heat resistant resin), and the guide member 180 is connected to the LED 5 from the opening portion 11Da. It extends so as to form a duct-like flow path having a closed cross-sectional space in cooperation with the substrate 6D.

  Also in the above configuration, at least one of the plurality of flow paths 17D (gap 17D) configured in the heat sink 10D is configured as a light source air guide path 18D that directs the LED 5 and at least one portion of the light source air guide path 18D is formed. Since the heat sink 10D is formed, the LED 5 can be cooled directly in addition to the cooling using the heat sink 10D, as in the above-described embodiment, so that the LED 5 can be effectively cooled.

  Furthermore, when wind is generated by the cooling fan unit 21D provided with the propeller, no wind is generated near the rotation center, but a predetermined flow path 17Da located radially outside of the LED 5 is provided as in the present embodiment. By configuring as a part of the light source air guide path 18D, strong wind generated from the outside of the rotation center of the cooling fan unit 21D can be directed to the LED 5 along the light source air guide path 18D. Can be efficiently cooled.

The present invention is not limited to the configuration of the above-described embodiment, and can be formed in various embodiments.
Further, in the present invention, the front indicates the irradiation direction of the light source, and the back (rear) indicates the opposite direction to the irradiation direction of the light source. In the above-described embodiment, the irradiation direction of the LED 5 and the vehicle Although the example in which the front coincides and the example in which the irradiation direction of the LED 5 and the irradiation direction of the lamp unit coincide with each other have been described, they may not necessarily coincide with each other.

  Specifically, in the case where the vehicle lamp is provided with a reflector (not shown), the front of the present invention indicates a direction toward the reflector until the light emitted from the LED 5 is refracted by the reflector. At the same time, after being refracted by the reflector, the direction toward the outer lens (outside the vehicular lamp) is indicated.

1, 1A, 1B, 1C, 1D ... Vehicle lamp 10, 10D ... Heat sink 5 ... LED (light source)
6f: Front surface of substrate (on the intersecting surface intersecting the optical axis)
16, 16D ... Radiation fins 18, 18B, 18C, 18D ... Light source air duct (flow path)
18a ... front-rear direction flow path part 18b ... direction change flow path parts 19a, 11Da ... opening 20, 20D ... air blower 27 ... air blower opening (blower part)
30 ... Light source array 181 ... Air outlet (flow outlet)
L: Longitudinal direction Lc of the light source array part ... Longitudinal direction X of the light source array part ... Optical axis of the light source

Claims (6)

In a vehicle lamp comprising a light source, a heat sink thermally connected to the light source on the back of the light source, and a blower provided with a blower on the back of the heat sink,
Between the air blowing unit and the light source, a flow path for guiding the air blown from the air blowing unit to blow out toward the light source is provided,
A vehicle lamp in which at least a part of the flow path is formed by the heat sink. With respect to the light source, the air blowing unit is provided on the outer side in the intersecting direction intersecting the optical axis extending forward of the light source,
The flow path is formed in a duct shape by a front-rear direction flow path part extending forward from the air blowing part and a direction change flow path part for changing the air blowing direction of the air flowing through the front-rear direction flow path part to the inside of the crossing direction. The vehicular lamp according to claim 1 formed. A plurality of the light sources are provided, and a light source array unit in which the plurality of light sources are arranged in a row on an intersecting surface intersecting the optical axis is configured.
The blowing part of the said flow path is provided in the position which blows out toward the center of the longitudinal direction of this light source arrangement part from the direction which cross | intersects the longitudinal direction of the said several light source arrangement part. Vehicle lamp. The vehicular lamp according to any one of claims 1 to 3, wherein the outlet of the flow path is provided below the light source. In the portion of the heat sink that the flow path crosses, an opening that communicates each side with respect to the crossing portion in the extending direction of the flow path is formed.
The vehicular lamp according to any one of claims 1 to 4, wherein at least a part of the extending direction of the flow path is formed by the opening. The heat sink is provided with a plurality of radiating fins extending in the front-rear direction,
6. The vehicular lamp according to claim 1, wherein a part of the flow path is formed between the adjacent heat radiation fins with a closed cross section using the heat radiation fins as flow path walls.

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