WO2018088500A1

WO2018088500A1 - Vehicle lamp

Info

Publication number: WO2018088500A1
Application number: PCT/JP2017/040489
Authority: WO
Inventors: 孝徳浜本; 和宏黒田
Original assignee: 市光工業株式会社
Priority date: 2016-11-10
Filing date: 2017-11-09
Publication date: 2018-05-17
Also published as: CN109906339B; EP3540293A4; EP3540293B1; CN109906339A; JP2018078043A; EP3540293A1; JP6711242B2

Abstract

In order to provide a vehicle lamp that has greater cooling efficiency and comprises a first light source unit having a semiconductor-type first light-emitting chip and a second light source unit having a semiconductor-type second light-emitting chip, this vehicle lamp comprises a first light source unit which has a semiconductor-type first light-emitting chip, a second light source unit which is disposed further forward than the first light source unit and which has a semiconductor-type second light-emitting chip, and a heat sink. The heat sink is provided with a base part, and a fin part which has heat releasing fins disposed on a rear surface side of the base part. The base part is provided with a horizontal section on which the first light source unit is disposed, an inclined section which extends downward from the front of the horizontal section and on which the second light source unit is disposed, and an opening which is provided between the first light source unit and the second light source unit and through which gas can travel. The fin part is provided with a vertical fin section in which a plurality of vertical fins which extend back from the rear surface of the inclined section are arranged in the horizontal direction. The opening is provided so as to include a position corresponding to the vertical fin section.

Description

Vehicle lighting

The present invention relates to a vehicular lamp.

Patent Document 1 discloses a vehicular lamp including a lamp unit that can form both a low beam light distribution pattern and a high beam light distribution pattern, and the high beam light distribution pattern uses a plurality of light emitting chips. A vehicular lamp that can perform variable high beam (Adaptive Driving Beam) control that changes a light distribution pattern according to the position of a preceding vehicle or an oncoming vehicle is disclosed.

JP 2016-039020 A

By the way, in recent years, as semiconductor-type light sources such as LEDs have become high power, semiconductor-type light sources such as LEDs are used as light sources for vehicle lamps, as can be seen in Patent Document 1. It is becoming.

However, since the light emitting chip of a semiconductor-type light source such as an LED decreases in luminous efficiency at a high temperature, there is a risk that the luminous efficiency may decrease when using a large number of light emitting chips as a heat source as in Patent Document 1. is there.

This invention is made | formed in view of such a situation, and was provided with the 1st light source part which has a semiconductor type 1st light emitting chip, and the 2nd light source part which has a semiconductor type 2nd light emitting chip. An object of the present invention is to provide a vehicular lamp that has improved cooling efficiency.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) A vehicular lamp according to the present invention includes a first light source unit having a semiconductor-type first light emitting chip that emits light for low beam light distribution, and is disposed on the front side of the first light source unit. A second light source unit having a semiconductor-type second light emitting chip that emits light for use, and a heat sink in which the first light source unit and the second light source unit are arranged, and the heat sink includes the first light source unit. And a base part on which the second light source part is disposed, and a fin part having a radiation fin disposed on the back surface side of the base part, wherein the base part is a horizontal part on which the first light source part is disposed; , Extending from the front side of the horizontal part obliquely downward to the lower side, provided at a position between the first light source part and the second light source part, an inclined part for arranging the second light source part, and a gas An opening that can be circulated from the back side to the front side. The vertical portion includes a plurality of vertical fins arranged in the horizontal direction extending from the rear surface of the inclined portion to the rear side to the position of the horizontal portion on the front side of the first light source portion, The opening is provided so as to include a position corresponding to the vertical fin portion.

(2) In the configuration of (1), the second light source unit includes: a second substrate disposed on the inclined portion of the base unit; and the second light emitting chip provided on the second substrate. The second substrate is provided with a substrate opening through which at least part of the gas can flow from the back surface side to the front surface side, and the substrate opening of the second substrate is also provided in the inclined portion of the base portion. Is provided with an opening through which gas can flow from the back side to the front side.

(3) In the configuration of (1) or (2), the fin portion is provided on the rear side of the vertical fin portion, and a plurality of horizontal fins extending downward from the horizontal portion are arranged in the front-rear direction. The horizontal fin part arrange | positioned by is provided.

(4) In the configuration of (3), the opening is provided in the horizontal portion on the front side of the lateral fin portion.

(5) In any one configuration of (1) to (4) above, at least the rear inner wall surface of the opening is inclined forward from the lower side to the upper side.

(6) In any one of the constitutions (1) to (5), a lens disposed on the front side of the first light source unit and the second light source unit, and a front side disposed on the horizontal unit. A reflector that covers the first light source part in a semi-dome shape so as to open to the light source, and a part of light from the first light source part reflected by the reflector is shielded to form a cut-off line of a low beam light distribution pattern A shade, and the shade is disposed on the opening, and guides at least a part of the gas flowing out from the opening to the lens side.

(7) In any one of the constitutions (1) to (6), the opening is provided to reach a part of the inclined portion.

(8) In any one configuration of the above (1) to (7), a cooling fan is disposed below the fin portion and blows gas toward the base portion side.

According to the present invention, a vehicular lamp including a first light source unit having a semiconductor-type first light-emitting chip and a second light source unit having a semiconductor-type second light-emitting chip, which has improved cooling efficiency. The vehicular lamp can be provided.

1 is a plan view of a vehicle including a vehicle lamp according to a first embodiment of the present invention. It is the front view which looked at the lamp unit of 1st Embodiment which concerns on this invention from the front side. It is a vertical sectional view along the lens optical axis of the lamp unit of the first embodiment according to the present invention. It is the perspective view which looked at the heat sink mainly from the upper side of 1st Embodiment which concerns on this invention. It is a figure for demonstrating the modification of the heat sink of 1st Embodiment which concerns on this invention. It is the front view which looked at the lamp unit of 2nd Embodiment which concerns on this invention from the front side.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.
Note that the same number is assigned to the same element throughout the description of the embodiment.
Further, in the embodiment and the drawings, unless otherwise specified, “front” and “rear” indicate “forward direction” and “reverse direction” of the vehicle 102, respectively, and “up”, “down”, “ “Left” and “Right” respectively indicate directions viewed from the driver who gets on the vehicle 102.

(First embodiment)
The vehicular lamp according to the first embodiment of the present invention is a vehicular headlamp (101R, 101L) provided on each of the left and right front of the vehicle 102 shown in FIG. 1, and is simply referred to as a vehicular lamp below. To do.
In the following description of the lamp unit 10, the description will be given mainly using the vehicle lamp on the right side of the vehicle as an example, but the parts not specifically mentioned are common to the left and right vehicle lamps.

The vehicular lamp according to the present embodiment includes a housing (not shown) that opens to the front side of the vehicle and an outer lens (not shown) that is attached to the housing so as to cover the opening, and is formed by the housing and the outer lens. A lamp unit 10 (see FIGS. 2 and 3) and the like are disposed in the lamp chamber.

(Lamp unit 10)
2 is a front view of the lamp unit 10 as viewed from the front side, FIG. 3 is a vertical sectional view along the lens optical axis Z of the lamp unit 10, and FIG. 4 is a perspective view of the heat sink 40 as viewed mainly from above. FIG.
2 and 3 indicates the vertical axis passing through the rear focal point O of the lens 50.
In FIG. 2, the lens 50 is omitted and the inside is shown.

As shown in FIG. 3, the lamp unit 10 of the present embodiment includes a first light source unit 20, a second light source unit 30, a heat sink 40, a lens 50, a reflector 60, a shade 70, and a cooling fan 80. It is equipped with.

(First light source unit 20)
The first light source unit 20 is a light source unit that emits light for low beam light distribution. In the present embodiment, the first light source unit 20 is provided on one first substrate 21 and the first substrate 21, and emits light for low beam light distribution. It comprises a first light source 23 having a semiconductor-type first light-emitting chip 22 that radiates.
However, the first light source unit 20 may be configured by a plurality of first light sources 23.
Further, the first light source 23 used in the first light source unit 20 may have a configuration in which a plurality of first light emitting chips 22 are provided on one first substrate 21.

In the present embodiment, an LED chip that is a semiconductor-type light-emitting chip is used as the first light-emitting chip 22, but the first light-emitting chip 22 is not limited to the LED chip. A certain LD chip (laser diode chip) may be used.

(Second light source unit 30)
The second light source unit 30 is a light source unit that emits light for high beam light distribution. In the present embodiment, as shown in FIGS. 2 and 3, the second light source unit 30 is provided on one second substrate 31 and the second substrate 31. And a second light source 33 (see FIG. 3) having a plurality of semiconductor-type second light emitting chips 32 (see FIG. 3) that radiate light for high-beam distribution in the horizontal direction. On the two substrates 31, a power feeding connector 35 for power feeding to which an external connector is connected is provided.
However, the second light source unit 30 may be configured by arranging a plurality of second light sources 33 each having one second light emitting chip 32 on one second substrate 31 in the horizontal direction.

In the present embodiment, the cover 36 provided so as to cover the power supply connector 35 is also disposed on the second substrate 31 in order to prevent the power supply connector 35 from being seen from the outside.
However, you may make it provide the cover 36 in the base part 41 (for example, the inclination part 43 mentioned later) of the heat sink 40. FIG.

In the lamp unit 10 according to the present embodiment, the second light emitting chip 32 is controlled to be turned on / off according to the position of the preceding vehicle or the oncoming vehicle, thereby suppressing the generation of glare light on the preceding vehicle or the oncoming vehicle. In addition, variable high beam (Adaptive Driving Beam) control for changing the high beam light distribution pattern can be performed.

In the present embodiment, an LED chip that is a semiconductor light emitting chip is used for the second light emitting chip 32 as in the case of the first light emitting chip 22, but the second light emitting chip 32 is not necessarily limited to the LED chip. For example, an LD chip (laser diode chip) which is a semiconductor light emitting chip may be used.

Note that, as described above, since the right vehicle lamp is shown in the present embodiment, as shown in FIG. 2, the rear focus O of the lens 50 is viewed from the front when the lamp unit 10 is viewed from the front side. Four second light emitting chips 32 are arranged on the left side (vehicle outer side) and seven second light emitting chips 32 are arranged on the right side (vehicle inner side) with reference to the Y axis that is the vertical axis that passes through. In contrast, in the case of the vehicular lamp, four second light emitting chips 32 may be provided on the right side with respect to the Y axis, and seven second light emitting chips 32 may be provided on the left side.

However, when the inside and outside of the vehicle 102 are used as a reference, the vehicle inner side and the vehicle outer side are reversed between the right side vehicle lamp and the left side vehicle lamp.
That is, in the left vehicle lamp, since the left side is the vehicle inner side and the right side is the vehicle outer side when viewed from the front, the number of the second light emitting chips 32 based on the Y axis is expressed as the vehicle inner side and the vehicle outer side. When used, the same applies to the left and right vehicle lamps.

Further, the number of the second light emitting chips 32 is not necessarily limited to 11, and is appropriately determined in consideration of the horizontal light distribution range of the formed high beam light distribution pattern and variable high beam (Adaptive Driving Beam) control. It may be changed.

(Heat sink 40)
As shown in FIGS. 3 and 4, the heat sink 40 includes a base portion 41 on which the first light source unit 20 (see FIG. 3) and the second light source unit 30 (see FIG. 3) are arranged, and a plurality of heat radiating fins (vertical fins). 47 and fins 45 having lateral fins 49).
For example, the heat sink 40 is preferably formed of a metal material or plastic material having high thermal conductivity. In this embodiment, the heat sink 40 made of aluminum die casting is used.

The base portion 41 includes a horizontal portion 42 in which the first light source unit 20 is disposed, an inclined portion 43 that extends obliquely forward and downward from the front side of the horizontal portion 42, and a first light source portion 30. An opening 44 is provided at a position between the light source unit 20 and the second light source unit 30 and opens the back side and the front side of the base unit 41.

On the other hand, the fin portion 45 is a vertical fin in which a plurality of vertical fins 47 extending from the back surface of the inclined portion 43 to the rear side to the position of the horizontal portion 42 on the front side of the first light source unit 20 are arranged in the horizontal direction. And a horizontal fin portion 48 provided on the rear side of the vertical fin portion 46 and having a plurality of horizontal fins 49 arranged in the front-rear direction and extending downward from the back surface of the horizontal portion 42. Yes.

(Lens 50)
The lens 50 is a member that emits light from the first light source unit 20 and the second light source unit 30 under light distribution control so as to form a predetermined light distribution pattern on the front side, and a lens holder 50a (see FIG. 2 and FIG. 2). It is attached to the heat sink 40 via FIG.

The material forming the lens 50 is not particularly limited, and transparent glass or resin may be used. From the viewpoint of good moldability, the lens 50 is formed of a transparent resin. preferable.
For example, for the lens 50, an acrylic resin that has a small wavelength dependency of the refractive index and easily suppresses the blue spectral color can be suitably used.

In addition, as in the present embodiment, when a large number of light emitting chips (the first light emitting chip 22 and the second light emitting chip 32) are used and heat resistance is to be given priority, a resin having excellent heat resistance such as polycarbonate resin. May be used for the lens 50.

The reflector 60 is disposed on the horizontal part 42 of the base part 41 and covers the first light source part 20 in a semi-dome shape so as to open to the front side.
The reflector 60 has a reflective surface 61 formed on the first light source unit 20 side, and directs light emitted upward from the first light emitting chip 22 of the first light source unit 20 toward the lens 50. Reflect.

The reflecting surface 61 has a curved surface shape that is a part of an elliptical shape, and is formed to have two focal points, a first focal point and a second focal point.
The reflector 60 has a first focal point at the rear focal point O of the lens 50 or in the vicinity of the rear focal point O, and on the horizontal portion 42 so that the second focal point is positioned at the light emission center of the first light emitting chip 22 or near the light emission center. Is arranged.

(Shade 70)
The shade 70 shields part of the light from the first light emitting chip 22 of the first light source unit 20 reflected by the reflector 60 and forms a cut-off line of the low beam light distribution pattern.
For this reason, as shown in FIG. 2, the edge part 71 of the front side of the shade 70 is formed in the shape matched with the cut-off line.

The shade 70 is disposed on the horizontal portion 42 of the heat sink 40 so that the portion that forms the upper end portion of the oblique cut-off line of the edge portion 71 is positioned in the vicinity of the rear focal point O of the lens 50.
In the present embodiment, as shown in FIG. 3, the shade 70 is disposed on the horizontal portion 42 so that the rear focal point O of the lens 50 is located at a position of about 1.0 mm rearward from the edge portion 71. Yes.

Further, as shown in FIG. 3, the shade 70 is disposed on the horizontal portion 42 so as to be positioned slightly above the opening 44 on the opening 44 provided in the horizontal portion 42 of the heat sink 40. ing.

(Cooling fan 80)
The cooling fan 80 is a member that accelerates cooling of the heat sink 40 by forcibly blowing a gas such as air to the fin portion 45 of the heat sink 40.

Specifically, as shown in FIG. 4, an attachment leg 41 a for attaching the cooling fan 80 extends from the base part 41 of the heat sink 40 to the lower side of the fin part 45, and is attached to the attachment leg 41 a. Thus, the cooling fan 80 is disposed below the fin portion 45 so that the gas outlet side faces the fin portion 45 side.
In FIG. 4, only the two mounting leg portions 41a on the rear side are visible, but the two mounting leg portions 41a are also provided on the front side, and the cooling fan 80 is mounted on the four mounting leg portions 41a. ing.

The lamp unit 10 having the above-described configuration will be described in further detail with reference to the flow of gas such as air from the cooling fan 80.
When the cooling fan 80 is driven, a gas such as air is blown onto the fin portion 45.

Specifically, as can be seen from FIG. 3, the cooling fan 80 is arranged so as to blow air to both the vertical fin portion 46 and the horizontal fin portion 48, and one of the winds generated by the cooling fan 80. The part is sprayed toward the lateral fin part 48.

The wind blown to the horizontal fin portion 48 passes between the plurality of horizontal fins 49 arranged in the front-rear direction, flows upward while taking heat from the horizontal fin 49, and the first light source portion 20 of the horizontal portion 42. It hits the back side of the part where is arranged.

Then, the wind whose upward flow is restricted by the back surface of the horizontal portion 42 flows further in the horizontal direction along the back surface of the horizontal portion 42 while taking the heat of the horizontal portion 42, and Released out of the direction.

By the way, in order not to disturb the flow of gas (air or the like) from the cooling fan 80, it is important that the wind is efficiently discharged from the heat sink 40.
However, in recent years, miniaturization of vehicular lamps has been required, and in particular, miniaturization in the front-rear direction has been demanded.

For this reason, since the wall surface of the housing forming the lamp chamber tends to be close to the rear side of the lamp unit 10, the horizontal fin 49 of the horizontal fin portion 48 is used as a vertical fin so that the wind is emitted to the rear side. Then, the wind cannot be efficiently released.

On the other hand, in the left-right direction, since a space for releasing wind can be taken, the rear fin side of the heat sink 40 is set as a horizontal fin portion 48 in which the horizontal fins 49 are arranged in the front-rear direction as in the present embodiment. Thus, it is possible to prevent the release of wind.
For this reason, the flow of the wind flowing between the horizontal fins 49 can be improved, and the first light source unit 20 can be efficiently cooled.

On the other hand, as described above, the front side of the heat sink 40 is the vertical fin portion 46 in which the vertical fins 47 are arranged in the horizontal direction (left-right direction).
The vertical fin portion 46 is formed by extending the vertical fin 47 from the back surface of the inclined portion 43 extending diagonally forward and downward from the front side of the horizontal portion 42 to the rear side.

For this reason, a part of the wind blown to the vertical fin portion 46 is not obstructed by the fin, and along the inclination from the lower side to the rear side of the inclined portion 43 on the rear side, It flows while contacting the back side.
In addition, when the fin provided here is a horizontal fin, since it will be guided to the left-right outer side by a horizontal fin, it cannot flow upwards.
In particular, since the back surface of the inclined portion 43 is inclined unlike the vertical surface, the wind contacts efficiently, so that high heat dissipation efficiency can be obtained.

As shown in FIGS. 3 and 4, the horizontal portion 42 of the base portion 41 has an opening 44 through which gas can flow from the back surface side to the front surface side so as to include a position corresponding to the vertical fin portion 46. Therefore, a part of the wind that flows upward through the vertical fin portion 46 flows out to the upper side of the heat sink 40 through the opening 44.

As described above, the opening 44 is provided at a position between the first light source unit 20 and the second light source unit 30, and the wind flowing out from the opening 44 is supplied to these light source units (first light source unit 20. In addition, the heat of the second light source unit 30) is combined and blown out to a portion where the temperature tends to be high, and high cooling efficiency can be obtained.

Since a gap is formed between the vertical fin 47 and the horizontal fin portion 48, the gas flowing between the vertical fins 47 in the portion where the opening 44 of the vertical fin portion 46 is not provided also flows. Without being obstructed, the air flows out to the horizontal side through the gap between the vertical fin 47 and the horizontal fin portion 48 so that the flow of the wind does not stagnate.

In the present embodiment, as shown in FIG. 3, since the shade 70 is provided on the opening 44, the flow direction of the gas blown out from the cooling fan 80 so as to flow upward is horizontal. Since it is guided in the direction (left side direction and right side direction as viewed in FIG. 3), at least part of the gas flowing out from the opening 44 is guided to the lens 50 and the second light source unit 30 side and flows out from the opening 44. At least a part of the gas is guided to the first light source unit 20 side.
For this reason, it is possible to cool together with the 1st light source part 20 and the 2nd light source part 30 including the lens 50 which becomes high temperature easily by radiant heat.

However, the shade 70 is not necessarily located on the opening 44.
For example, when the second light source unit 30 is positioned slightly below and the opening 44 is provided up to a part of the upper side of the inclined portion 43, a part of the gas flowing out from the opening 44 is reduced. Since it can be made to flow out toward the front side, instead of positioning the shade 70 on the upper side of the opening 44, the opening 44 is provided to reach a part on the upper side of the inclined portion 43. Also good.

Note that the opening 44 may be provided up to a part of the upper side of the inclined portion 43 in a state where the shade 70 is positioned above the opening 44.
As described above, when the gas flowing out from the opening 44 is directed to the front side, the gas flows near the second light source unit 30, so that the second light source unit 30 can be cooled more efficiently.

Further, as can be seen from FIG. 3, the vertical fin portion 46 is wide on the cooling fan 80 side and narrows toward the upper side by the inclined portion 43, so that the wind from the cooling fan 80 can be efficiently passed. When the air flow is received, the flow velocity of the wind increases toward the upper side, and it is easy to blow out from the opening 44 vigorously.

For this reason, while being able to blow a wind to the lens 50 side and the 1st light source part 20 side efficiently, the shade 70 is the 2nd light source part 30 as the gas blown toward the lens 50 side. Coupled with the fact that it also extends upward, it flows so as to spread toward the second light source unit 30 in accordance with the fact that it is not restricted by the horizontal part 42 on the front side of the shade 70, so that the second light source unit 30 is efficiently Cooling.

In addition, if the flow of the gas flowing out from the opening 44 is directed to the front side, the flow of the gas toward the first light source unit 20 is reduced, but the first light source unit 20 is used as in the present embodiment. In the case of the second light source unit 30 provided with a large number of light emitting chips, the amount of heat generated by the second light source unit 30 increases. Therefore, considering the overall cooling efficiency, the flow of gas flowing out from the opening 44 is reduced. It is preferable to face the front side.

(Modification of heat sink 40)
Next, a modification of the heat sink 40 will be described with reference to FIG.
FIG. 5 is a vertical sectional view of a modification of the heat sink 40 corresponding to FIG.
Since the basic configuration of the modified example of the heat sink 40 shown in FIG. 5 is the same as that of the heat sink 40 described above, different parts will be mainly described below.

In the modification shown in FIG. 5, the shape of the inner wall surface 44 a of the opening 44 is devised so that the flow of gas such as air flowing out from the opening 44 is easily directed forward.
Specifically, the opening 44 is formed such that the inner wall surface 44a on the rear side is inclined forward from the lower side toward the upper side, and moves forward when the gas passes through the opening 44. I try to make it flow.
In this way, even if the shade 70 is not disposed on the opening 44, the gas flowing out from the opening 44 can be directed forward.

In the example shown in FIG. 5, the gas flowing out from the opening 44 is inclined so as to be inclined forward in the range from the portion of the lateral fin portion 48 positioned on the most front side to the inner wall surface 44 a of the opening 44. If the inner wall surface 44a on the rear side of the horizontal portion 42 of the base portion 41 that forms the opening 44 is an inclined surface that is inclined to the front side toward the upper side. Good.

(Second Embodiment)
Next, a lamp unit 10 according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a front view of the lamp unit 10 according to the second embodiment as viewed from the front side.
6 also omits the illustration of the lens 50 as in FIG. 2, the lens 50 is attached to the lens holder 50a in the same manner as shown in FIG.
In addition, since the basic configuration of the lamp unit 10 of the second embodiment is the same as that of the first embodiment, different points will be mainly described below, and description of similar points may be omitted.

As shown in FIG. 6, the second substrate 31 disposed on the inclined portion 43 of the base portion 41 is provided below the second light emitting chip 32, and a substrate opening through which gas can flow from the back side to the front side. 31a is formed.
The inclined portion 43 of the base portion 41 is also provided with an opening 43a through which gas can flow from the back surface side to the front surface side at a position corresponding to the substrate opening 31a of the second substrate 31.
In FIG. 6, the vertical fins 47 that can be seen through the substrate openings 31a and the openings 43a are not shown.

Accordingly, since the gas flows out from the substrate opening 31a toward the lens 50, the gas can flow more efficiently toward the lens 50 than the gas flowing out from the upper side of the heat sink 40, and the cooling effect of the lens 50 is enhanced. be able to.

Further, since a part of the gas flowing out from the substrate opening 31a also flows to the second light emitting chip 32 side, the efficiency of cooling the second light emitting chip 32 (second light source unit 30) is further enhanced.

In this example, the substrate opening 31a is provided on the lower side of the second light emitting chip 32. For example, when there is a space above the second light emitting chip 32, the substrate opening 31a is provided on the upper side. In this case, the lens 50 can be efficiently cooled.

Thus, the substrate opening 31a is provided in at least a part of the second substrate 31, and the opening 43a is provided at a position corresponding to the substrate opening 31a of the inclined portion 43 so that the gas flows out toward the lens 50 side. Thereby, the lens 50 and the 2nd light source part 30 can be cooled further, and heat dissipation can be improved further.

Although the present invention has been described based on the specific embodiments, the present invention is not limited to the above embodiments.
For example, the cooling fan 80 may be omitted, and even when the cooling fan 80 is omitted, an upward air flow is generated when a gas such as air is warmed by the heat of the radiating fins (vertical fins 47 and horizontal fins 49). The gas flow as described above occurs naturally.
However, it is needless to say that it is preferable to provide the cooling fan 80 because the generated gas flow is stronger when the cooling fan 80 is provided, and high cooling efficiency is obtained.

Further, the horizontal width of the opening 44 may be changed as appropriate.
However, the second light source unit 30 can be efficiently cooled by setting the horizontal width of the opening 44 to be equal to or larger than the horizontal alignment width of the second light emitting chips 32 of the second light source unit 30 aligned in the horizontal direction. Therefore, the horizontal width of the openings 44 is preferably equal to or larger than the horizontal arrangement width of the second light emitting chips 32.

Furthermore, in the above-described embodiment, as shown in FIG. 3, the vertical fins 47 are formed so as to extend into the openings 44, but it is not always necessary to form the vertical fins 47 into the openings 44. .

Thus, the present invention is not limited to the above-described specific embodiments, and modifications and improvements that do not depart from the technical idea are also included in the technical scope of the invention. This will be apparent to those skilled in the art from the appended claims.

DESCRIPTION OF SYMBOLS 10 Lamp unit 20 1st light source part 21 1st board | substrate 22 1st light emission chip 23 1st light source 30 2nd light source part 31 2nd board | substrate 31a Substrate opening 32 2nd light emission chip 33 2nd light source 35 Feed connector 36 Cover 40 Heat sink 41 Base portion 41a Mounting leg portion 42 Horizontal portion 43 Inclined portion 43a Opening 44 Opening portion 44a Inner wall surface 45 Fin portion 46 Vertical fin portion 47 Vertical fin 48 Horizontal fin portion 49 Horizontal fin 50 Lens 50a Lens holder 60 Reflector 61 Reflecting surface 70 Shade 71 Edge 80 Cooling fan O Back focus Z Lens

optical axis

101L , 101R Vehicle headlamp 102 Vehicle

Claims

A first light source unit having a semiconductor-type first light emitting chip that emits light for low beam distribution;
A second light source unit disposed on the front side of the first light source unit and having a semiconductor-type second light emitting chip that emits light for high beam distribution;
A heat sink for disposing the first light source unit and the second light source unit,
The heat sink is
A base portion on which the first light source unit and the second light source unit are disposed;
A fin portion having heat dissipating fins disposed on the back side of the base portion,
The base portion is
A horizontal part for disposing the first light source part;
An inclined part extending from the front side of the horizontal part to the lower side obliquely forward and arranging the second light source part;
Provided at a position between the first light source unit and the second light source unit, and an opening through which gas can flow from the back side to the front side,
The fin portion includes a vertical fin portion in which a plurality of vertical fins extending in a rearward direction from the back surface of the inclined portion to the position of the horizontal portion on the front side of the first light source portion are arranged in the horizontal direction. ,
The vehicular lamp, wherein the opening is provided so as to include a position corresponding to the vertical fin portion.
The second light source unit is
A second substrate disposed on the inclined portion of the base portion;
The second light emitting chip provided on the second substrate,
The second substrate is provided with a substrate opening through which at least part of the gas can flow from the back surface side to the front surface side,
2. The opening of the inclined portion of the base portion is provided with an opening through which gas can flow from the back surface side to the front surface side at a position corresponding to the substrate opening of the second substrate. The vehicle lamp as described.
The fin portion includes a lateral fin portion provided behind the longitudinal fin portion and having a plurality of lateral fins arranged in the front-rear direction extending from the horizontal portion to the lower side. The vehicular lamp according to claim 1.
4. The vehicular lamp according to claim 3, wherein the opening is provided in the horizontal portion in front of the lateral fin portion.
2. The vehicular lamp according to claim 1, wherein at least the rear inner wall surface of the opening is inclined forward from the lower side toward the upper side.
A lens disposed on the front side of the first light source unit and the second light source unit;
A reflector disposed on the horizontal part and covering the first light source part in a semi-dome shape so as to open to the front side;
A shade that blocks a part of the light from the first light source part reflected by the reflector and forms a cut-off line of a low beam light distribution pattern, and
2. The vehicular lamp according to claim 1, wherein the shade is disposed on the opening and guides at least a part of a gas flowing out of the opening to the lens side.
The vehicular lamp according to claim 1, wherein the opening is provided to reach a part of the inclined portion.
The vehicular lamp according to claim 1, further comprising a cooling fan that is disposed below the fin portion and blows gas toward the base portion side.