JP2018014285A - Vehicle lighting - Google Patents

Abstract

The present invention provides a vehicular lamp that reduces the occurrence of problems due to temperature rise of an optical lens when a high-output light source is used.
A light source device having a light emitting element, a projection optical system including a plurality of lenses, and enlarging and projecting light emitted from the light source device, and a projection optical system so that a part of the plurality of lenses is accommodated therein. A holding member that holds the air source, and a blower that cools the light source device. The holding member takes in the air blown from the blower into the inside, and discharges the air taken in from the intake hole to the outside The present invention relates to a vehicular lamp including a discharge hole.
[Selection] Figure 1

Description

  The present invention relates to a vehicular lamp.

  2. Description of the Related Art Conventionally, a vehicular lamp having a projection optical system including a plurality of optical lenses is known (for example, see Patent Document 1 below). In this vehicular lamp, a plurality of optical lenses constituting the projection optical system are housed in a lens holder.

JP, 2015-120474, A

  By the way, in the said vehicle lamp, when a high output light source is used, the amount of light which permeate | transmits an optical lens increases, and the heating amount of an optical lens also becomes large. In particular, the optical lens housed in the lens holder is likely to generate heat, and may be deformed or damaged by exceeding the heat resistant temperature of the material. This makes it impossible to generate a desired light distribution pattern.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a vehicular lamp in which occurrence of problems due to temperature rise of an optical lens when a high-output light source is used is reduced. And

  According to one embodiment of the present invention, a light source device having a light emitting element, a plurality of lenses, a projection optical system for enlarging and projecting light emitted from the light source device, and a part of the plurality of lenses inside A holding member that holds the projection optical system so as to be accommodated, and a blower that cools the light source device, and the holding member includes an intake hole that takes in the air blown from the blower into the inside There is provided a vehicular lamp including a discharge hole for discharging the air taken in from the take-in hole to the outside.

  According to the vehicle lamp of this aspect, the lens housed in the holding member can be cooled by taking in the air blown from the blower into the holding member. Thereby, even when high-power light is emitted from the light source device, it is possible to reduce the occurrence of problems due to the temperature rise of the lens.

Moreover, in the said vehicle lamp, it is desirable for the said holding member to have a flow path which connects the said intake hole and the said discharge hole.
According to this configuration, the air blown from the blower smoothly flows from the intake hole to the discharge hole along the flow path. Therefore, the lens can be efficiently cooled.

Furthermore, the spacer member further includes a spacer member that holds adjacent lenses in a state having a predetermined interval, and the spacer member has a gap formed between the lenses arranged at the predetermined interval. It is more desirable to have an opening that communicates with the road.
If it does in this way, the air taken in from the taking-in hole comes to flow into the gap through the opening. Therefore, since it can blow with respect to the surface of the lens exposed in a clearance gap, a lens can be cooled efficiently. Therefore, a resin lens having a low heat-resistant temperature can be used as the lens.

Moreover, in the said vehicle lamp, it is further provided with the heat radiating member holding the said light source device, and it is desirable for the said air blower to ventilate the said heat radiating member.
According to this configuration, the light source device can be efficiently cooled by the heat radiating member.

Furthermore, it is more preferable that the blower device is disposed on the side opposite to the light source device with respect to the heat radiating member, and the heat radiating member has a through-hole formed in a region facing the blower device.
If it does in this way, the ventilation from a blowing device can be supplied to the holding member side by a through-hole.

Further, it is more preferable that the intake hole and the through hole are arranged to face each other in a state where the holding member is fixed to the heat dissipation member.
If it does in this way, the ventilation from a blowing device can be taken in in a holding member via a taking-in hole and a penetration hole.

In the vehicle lamp, it is preferable that the discharge hole is formed at a position that does not overlap the lens in the arrangement direction of the plurality of lenses.
According to this configuration, since the discharge hole is formed in a portion of the holding member that is different from the lens holding portion that holds the lens, the lens holding function of the holding member is not impaired by the discharge hole.

  According to the present invention, it is possible to reduce the occurrence of problems due to the temperature rise of the optical lens when a high-output light source is used.

The disassembled perspective block diagram of the vehicle lamp of this embodiment. The figure which shows schematic structure of a light source device. The perspective view which shows the structure of the one surface side of a heat sink. The perspective view which shows the structure of the other surface side heat sink. The perspective view which shows the principal part structure of a lens holder. The figure which shows the cross-sectional structure of a vehicle lamp.

  Hereinafter, a vehicular lamp that is an embodiment of the present invention will be described with reference to the drawings. In the drawings used in the following description, in order to make the features easy to understand, portions that become features may be shown in an enlarged manner for convenience, and the dimensional ratios and the like of each component are not always the same as actual.

  In this embodiment, as a vehicle headlamp (headlamp) mounted in front of the vehicle, a variable light distribution vehicle lamp that variably controls a high beam light distribution pattern is exemplified.

  In the drawings used for explanation in the present embodiment, an XYZ coordinate system may be used as a three-dimensional orthogonal coordinate system. Hereinafter, in the XYZ coordinate system, the Z-axis direction is a direction parallel to the optical axis of the vehicle lamp, the X-axis direction is a direction parallel to the left-right direction of the vehicle on which the vehicle lamp is mounted, and the Y-axis direction Are directions orthogonal to the Z-axis direction and the X-axis direction, respectively. Also, the Z-axis direction is the vehicle longitudinal direction, the X-axis direction is the vehicle left-right direction, the Y-axis direction is the vehicle vertical direction, the + Z side is the vehicle front side, the -Z side is the vehicle rear side, the + Y side is simply the upper side, -Y The side may be referred to as the lower side.

FIG. 1 is an exploded perspective view of a vehicular lamp 100 according to the present embodiment.
As shown in FIG. 1, a vehicular lamp 100 according to the present embodiment includes a light source device 10, a projection optical system 11 that magnifies and projects light emitted from the light source device 10, a lens holder (holding member) 12, A blower fan (blower device) 13 and a heat sink (heat radiating member) 14 are provided.

FIG. 2 is a diagram illustrating a schematic configuration of the light source device 10.
As shown in FIG. 2, the light source device 10 includes a circuit board 20 and a plurality of light emitting elements 21 mounted on the circuit board 20. In FIG. 2, only six light emitting elements 21 are shown for the sake of simplicity, but the number of light emitting elements 21 is not limited to this. For example, a structure in which a single light emitting element with a large amount of light is mounted may be used.

  In the present embodiment, each light emitting element 21 is constituted by an LED element. The plurality of light emitting elements 21 are arranged in a matrix in the left-right direction (X direction) and the up-down direction (Y direction) in the plane orthogonal to each other of the circuit board 20.

  In the present embodiment, the light emitting surface 21a of each light emitting element 21 has a substantially square shape. The light source device 10 includes a plurality of light emitting elements 21 in the left and right direction (three in FIG. 2) and a plurality of light emitting elements 21 in the vertical direction (in FIG. 2), with the light emitting surface 21a of each light emitting element 21 facing forward (+ Z direction). The two light emitting elements 21 are arranged at equal intervals. The light source device 10 can variably control the light distribution of the emitted light by switching the lighting of each light emitting element 21 by the circuit board 20.

  In the present embodiment, since the light source device 10 includes a plurality of light emitting elements 21, the temperature rises due to heat generation. On the other hand, in the vehicular lamp 100 of the present embodiment, the heat generated in the light source device 10 is reduced using the heat sink 14. In this embodiment, the cooling performance of the light source device 10 by the heat sink 14 is further improved by blowing air to the heat sink 14 by the blower fan 13.

3 and 4 are diagrams showing a schematic configuration of the heat sink 14, FIG. 3 is a perspective view showing a configuration of the heat sink 14 on one side, and FIG. 4 is a perspective view showing a configuration of the heat sink 14 on the other side. is there.
As shown in FIGS. 3 and 4, the heat sink 14 includes a plate-like member 31 and a plurality of fins 32 provided on the plate-like member 31, and is made of a metal material with high heat dissipation such as aluminum, for example. Is done.

On the one surface 31 a side of the plate-like member 31, a placement portion 33 for placing the light source device 10 is provided. The mounting portion 33 is a flat surface and contacts the circuit board 20 of the light source device 10.
A heat conducting member (not shown) is disposed between the light source device 10 and the mounting portion 33. The heat conducting member is made of, for example, grease, and reduces the thermal resistance between the light source device 10 and the heat sink 14 (mounting portion 33) by increasing the contact area. Thereby, the heat of the light source device 10 is favorably transmitted to the heat sink 14 side.

The plate-like member 31 has a plurality of (four in this embodiment) duct portions 34 around the placement portion 33. The duct portion 34 is formed by a through hole 34 a that penetrates the plate-like member 31.
The plurality of fins 32 are heat radiating fins for efficiently releasing the heat generated in the light source device 10. The plurality of fins 32 are plate-like members extending in the thickness direction of the plate-like member 31.

  A holding part 35 for holding the blower fan 13 is provided on the other surface 31 b side of the plate-like member 31. The fins 32 a located in the holding part 35 are lower in height than the fins 32 other than the holding part 35. A screw hole 35 a for screwing the blower fan 13 is formed in the holding portion 35.

  In the present embodiment, the through hole 34a communicates with the holding portion 35 side. The four through holes 34 a are formed at positions (opposite regions) that overlap the blower fan 13 held by the holding portion 35 in a plan view. Thereby, the duct part 34 can supply the ventilation by the ventilation fan 13 from the vehicle rear side to the vehicle front side by the through-hole 34a.

  In the present embodiment, it is desirable that the outer shape of the mounting portion 33 be the same as or smaller than the outer shape of the blower fan 13 (holding portion 35). In this way, the entire area corresponding to the placement portion 33 (the region where the fins 32 are formed) is cooled by the wind from the blower fan 13, and thus the light source device 10 placed on the placement portion 33. Can be cooled efficiently.

As shown in FIG. 1, the projection optical system 11 is held by the lens holder 12. The projection optical system 11 includes four lenses 11a, 11b, 11c, and 11d. In the present embodiment, a spacer member 16 is provided between the lenses 11b and 11c, and a spacer member 22 is provided between the lenses 11a and 11b. These spacer members 16 and 22 are composed of members different from the lens holder 12, and hold the lenses 11b and 11c or the lenses 11a and 11b in a state having a predetermined interval.
In this embodiment, the spacer member 16 has a substantially cylindrical shape, and openings 16a and 16b are formed on the outer peripheral surface. The spacer member 22 has a substantially cylindrical shape and does not have an opening on the outer peripheral surface.

  The projection optical system 11 projects forward an image corresponding to a predetermined light distribution pattern constituted by the light emitting portions (the plurality of light emitting elements 21 shown in FIG. 2) of the light source device 10 and corrects it to the vehicle lamp 100. A predetermined orientation pattern (high beam light distribution pattern) is formed on the virtual vertical screen (located at a position approximately 25 m ahead of the vehicle lamp 100).

  The lens holder 12 holding the projection optical system 11 is attached to the heat sink 14 via a screw member 15. It should be noted that the projection optical system 11 and the light source device 10 are positioned relative to each other so that the light emitting portion (the light emitting element 21 shown in FIG. 2) of the light source device 10 is arranged at the position of the synthetic focus in the projection optical system 11. It has been adjusted.

  FIG. 5 is a perspective view showing the structure of the lens holder 12 on the connection surface side with the heat sink 14. As shown in FIG. 5, the lens holder 12 has a plurality (four in this embodiment) of air intake portions 17. The air intake portion 17 has an intake hole 17 a that communicates with the inside of the lens holder 12. The lens holder 12 has a discharge hole 18 for discharging the air taken in from the air intake portion 17 to the outside.

  Each air intake portion 17 is disposed to face each duct portion 34 provided on the heat sink 14 side in a state where the lens holder 12 is attached to the heat sink 14. In this embodiment, the external shape of the intake hole 17a of the air intake part 17 and the through hole 34a of the duct part 34 are substantially the same. Thereby, the air blown from the blower fan 13 is supplied into the lens holder 12 via the duct part 34 and the air intake part 17.

FIG. 6 is a diagram showing a cross-sectional configuration of the vehicular lamp 100.
As shown in FIG. 6, the lenses 11 a, 11 b, 11 c, and 11 d are arranged at positions away from the light source device 10 in this order. That is, the lens 11a is disposed at a position (light emission side) farthest from the light source device 10, and the lens 11d is disposed at a position closest to the light source device 10 (light incident side).

  Accordingly, the lens 11 a functions as a final light emitting unit in the projection optical system 11, and the lens 11 d functions as an initial light incident unit in the projection optical system 11. Therefore, the lenses 11b and 11c sandwiched between the lenses 11a and 11d are held in a state of being accommodated in the lens holder 12.

  By the way, in this embodiment, since the light radiate | emitted from the light source device 10 is high output light, the temperature of the projection optical system 11 itself in which such high output light injects also rises. In this case, there is a risk of exceeding the heat resistance temperature of the material constituting the projection optical system 11.

  Therefore, it is conceivable to use glass having excellent heat resistance as the lenses 11a, 11b, 11c, and 11d constituting the projection optical system 11, but all the lenses 11a, 11b, 11c, and 11d are made of glass. As a result, the weight of the projection optical system 11 is greatly increased, which is not realistic.

  Here, since the lens 11a is disposed at a position farthest from the light source device 10, the temperature rise caused by the light source device 10 is not particularly problematic. Since the lenses 11b and 11c are housed inside the lens holder 12, heat is likely to be generated and the temperature is likely to rise as compared to the lens 11a. In the present embodiment, it is possible to use resin lenses as the lenses 11b and 11c by cooling the lenses 11b and 11c as described later.

  Thus, in the present embodiment, only the lens 11d that is disposed closest to the light source device 10, that is, the highest temperature, is a glass lens, and the other lenses 11a, 11b, and 11c are resin lenses. Thereby, an increase in weight in the projection optical system 11 was suppressed.

  As shown in FIG. 6, the lens holder 12 takes in part of the air (air blowing) from the blower fan 13 into the internal flow path 19 through the intake hole 17 a of the air intake portion 17. The internal flow path 19 is a flow path connecting the intake hole 17a and the discharge hole 18, and extends in the lens holder 12 in the vehicle front-rear direction. Therefore, the air taken in from the take-in hole 17a flows from the rear of the vehicle toward the front of the vehicle through the internal flow path 19, and is discharged to the outside through the discharge hole 18. Thereby, it is possible to prevent heat from being generated in the lens holder 12.

  In the present embodiment, a part (outer peripheral edge portion) of the lens 11 c is disposed on the internal flow path 19. Thereby, the temperature of the lens 11c can be lowered | hung because the air which passes the internal flow path 19 contacts with respect to the lens 11c. Therefore, the temperature rise in the lens 11c can be suppressed.

  As described above, the spacer member 16 has a substantially cylindrical shape, and the openings 16a and 16b are formed on the outer peripheral surface. Thereby, the clearance S generated between the lenses 11b and 11c is in a state of communicating with the internal flow path 19 through the openings 16a and 16b.

  Therefore, for example, air flowing in the internal flow path 19 flows into the gap S through the openings 16a and 16b. Therefore, since the air can be blown to the surfaces of the lenses 11b and 11c exposed in the gap S, the lens 11c can be cooled in addition to the lens 11c. Thereby, the temperature rise of the lenses 11b and 11c can be suppressed. Therefore, since the resin lenses having a low heat-resistant temperature can be used as the lenses 11b and 11c, the weight of the projection optical system 11 can be reduced as described above. Further, since lenses having surface treatment layers (for example, antireflection layers) with low heat resistance formed on the surfaces can be adopted as the lenses 11b and 11c, the degree of freedom of lenses that can be selected as the projection optical system 11 is improved. Therefore, it is possible to realize the projection optical system 11 having lenses according to various demands.

  Further, in the present embodiment, the openings 16 a and 16 b are arranged at positions that overlap with the discharge hole 18 in a state where the spacer member 16 is arranged in the lens holder 12. Thereby, since the opening parts 16a and 16b and the discharge hole 18 are arrange | positioned closely, the atmosphere in the clearance gap S will be in the state open | released in the external air via the opening parts 16a and 16b and the discharge hole 18. FIG. Yes. Therefore, it is possible to prevent the occurrence of a problem that heat is generated in the gap S.

  Further, in the present embodiment, the discharge hole 18 is formed at a position that does not overlap these lenses in the arrangement direction of the lenses 11a, 11b, 11c, and 11d constituting the projection optical system 11. Specifically, the discharge hole 18 is located between the lenses 11b and 11c. According to this configuration, since the discharge hole 18 is formed in a portion of the lens holder 12 that is different from the lens holding portion that holds the lens, the lens holding function of the lens holder 12 is not impaired by the discharge hole 18.

  As described above, according to the vehicular lamp 100 of the present embodiment, even when the high-power light source device 10 is used, a part of the air blown by the blower fan 13 is taken into the lens holder 12. The temperature of the projection optical system 11 can be reduced. Thereby, it is possible to reduce the occurrence of problems associated with the temperature rise of the projection optical system 11.

  In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

  For example, in the above-described embodiment, the lens 11d disposed closest to the light source device 10 among the lenses 11a, 11b, 11c, and 11d constituting the projection optical system 11 is formed of glass having excellent heat resistance. However, the present invention is not limited to this. For example, when a part of the internal flow path 19 extends in the vicinity of the lens 11d, that is, when the lens 11d can be sufficiently cooled by the air passing through the internal flow path 19, the lens 11d may be formed of a resin lens. .

  Moreover, in the said embodiment, although the case where it formed so that the internal flow path 19 might extend between the lenses 11b and 11c was mentioned as an example, this invention is not limited to this, The internal flow path 19 is the lenses 11a and 11b. You may form so that it may extend in between.

  DESCRIPTION OF SYMBOLS 10 ... Light source device, 11 ... Projection optical system, 11a, 11b, 11c, 11d ... Lens, 12 ... Lens holder (holding member), 13 ... Blower fan (blower device), 14 ... Heat sink (heat radiating member), 16 ... Spacer Member 16a ... Opening part 17a ... Intake hole 18 ... Discharge hole 19 ... Internal flow path 21 ... Light emitting element 34a ... Through hole 100 ... Vehicle lamp S ... Gap

Claims (7)

A light source device having a light emitting element;
A projection optical system comprising a plurality of lenses, and enlarging and projecting the light emitted from the light source device;
A holding member for holding the projection optical system so as to accommodate a part of the plurality of lenses therein;
A blower for cooling the light source device,
The said holding member contains the intake hole which takes in the air ventilated from the said air blower in the said inside, and the discharge hole which discharges | emits the said air taken in from the said intake hole outside. The vehicular lamp according to claim 1, wherein the holding member has a flow path that connects the intake hole and the discharge hole. A spacer member that holds the adjacent lenses in a state having a predetermined interval in the holding member;
The vehicular lamp according to claim 2, wherein the spacer member has an opening that allows a gap generated between the lenses arranged at the predetermined interval to communicate with the flow path. A heat dissipating member for holding the light source device;
The vehicular lamp according to claim 1, wherein the blower blows air to the heat dissipation member. The blower is disposed on the side opposite to the light source device with respect to the heat dissipation member,
The vehicular lamp according to claim 4, wherein the heat dissipating member has a through hole formed in a region facing the blower. The vehicular lamp according to claim 5, wherein the holding hole and the through hole are arranged to face each other in a state where the holding member is fixed to the heat radiating member. The vehicular lamp according to any one of claims 1 to 6, wherein the discharge hole is formed at a position that does not overlap the lens in the arrangement direction of the plurality of lenses.

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