Vehicle lamp fitting and heat sink

Abstract

To provide a vehicle lamp fitting etc. which can inhibit deformation and erosion of a resin lens even if the resin lens having a low heat resisting temperature is used.SOLUTION: A vehicle lamp fitting 10 includes: light sources 20A, 20B; a substrate 30 including a substrate front surface on which the light sources are mounted and a substrate rear surface at the opposite side of the substrate front surface; a heat sink 40 which is disposed behind the light sources and radiates heat generated by the light sources; and a resin lens 50 disposed in front of the light sources and configured to control light emitted by the light sources. The heat sink includes: a base part 41 including a base front surface 41a and a base rear surface 41b at the opposite side of the base front surface 41a; heat radiation fins 42 provided on the base rear surface; and a lens attachment surface 43 extending forward from the base front surface. The lens attachment part includes: a fixing part 43a provided at a tip of the lens attachment part; and a connection part 43b connecting the fixing part with the base front surface.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a vehicle lamp and a heat sink. [Background technology]

[0002] There is known a vehicle lamp including a substrate including a substrate front surface on which a light source is mounted and a substrate rear surface on the opposite side, a heat sink for transferring and dissipating heat generated by the light source, and a resin lens for controlling light emitted by the light source (see, for example, FIG. 4 of Patent Document 1). The heat sink includes a base portion including a substrate front surface and a substrate rear surface on the opposite side, and a heat dissipation fin provided on the substrate rear surface. The resin lens is attached to the heat sink in a state in front of the light source by directly fixing (screw fixing) a flange portion provided at the tip of a leg portion (cylindrical portion) extending from the resin lens toward the heat sink to the heat sink (base front surface). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-134640 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the vehicle lamp described in Patent Document 1 above, the leg (flange portion) of the resin lens is fixed to a portion of the heat sink (the front surface of the base) that is close to the light source (heat source). As a result, heat transmitted from the light source (heat source) through the heat sink increases the temperature at the contact point between the resin lens (flange portion) and the heat sink (fixed portion). This causes deformation or melting of the resin lens, which has a low heat resistance (for example, the heat resistance of an inexpensive acrylic resin lens is approximately 100°C), which may result in poor light distribution.

[0005] The present disclosure has been made to solve such problems, and aims to provide a vehicle lamp and a heat sink that can suppress deformation and melting of a resin lens even when a resin lens with a low heat resistance temperature (e.g., an inexpensive acrylic resin lens) is used. [Means for solving the problem]

[0006] The vehicle lamp according to the present disclosure comprises a light source, a substrate including a substrate front surface on which the light source is mounted and a substrate rear surface opposite the substrate, a heat sink arranged behind the light source and transmitting and dissipating heat generated by the light source, and a resin lens arranged in front of the light source and controlling the light emitted by the light source, wherein the heat sink includes a base portion including a substrate front surface and a substrate rear surface opposite the substrate rear surface, a heat dissipation fin provided on the substrate rear surface, and a lens mounting portion extending forward from the substrate front surface, wherein the lens mounting portion includes a fixing portion provided at a tip portion of the lens mounting portion and a connection portion connecting the fixing portion and the substrate front surface, the substrate is fixed to the substrate with the substrate rear surface and the substrate front surface facing each other, and the resin lens is fixed to the fixing portion in a state of abutment with the fixing portion.

[0007] With this configuration, even when a resin lens with a low heat resistance temperature (for example, an inexpensive acrylic resin lens) is used, deformation or melting of the resin lens can be suppressed. As a result, it is possible to suppress the occurrence of poor light distribution due to deformation or melting of the resin lens.

[0008] This is because the resin lens is fixed to a lens attachment portion (fixing portion) that extends forward from the front surface of the base.

[0009] In the above vehicle lamp, the connection portion may be formed with a through hole or a notch that penetrates therethrough in the up-down direction.

[0010] With this configuration, the amount of heat transferred to the contact point between the resin lens and the lens attachment part (fixed part) is reduced compared to when no through hole (or notch) is formed in the connection part. This is mainly because the heat dissipation area is increased by the through hole (inner wall of the through hole) formed in the connection part, and heat dissipation is promoted by convection caused by the chimney effect in the through hole (or notch) that penetrates in the vertical direction.

[0011] Therefore, even when a resin lens with a low heat resistance temperature (for example, an inexpensive acrylic resin lens) is used, deformation and melting damage of the resin lens can be further suppressed. As a result, it is possible to further suppress the occurrence of poor light distribution due to deformation and melting damage of the resin lens.

[0012] In addition, in the above-mentioned vehicle lamp, the through hole or notch may be formed in a portion of the connection portion where less heat is transferred to the fixed portion via the connection portion compared to before the through hole or notch is formed.

[0013] In the above vehicle lamp, the portion may be a portion of the connection part that includes a central axis of the fixing part, the central axis extending in a front-rear direction.

[0014] In the vehicle lamp described above, a width in the left-right direction of the through hole or the cutout portion may be equal to or greater than a width in the left-right direction of the fixing portion.

[0015] The heat sink disclosed herein is a heat sink that transfers and dissipates heat generated by a light source, and includes a base portion including a front surface of the base and a rear surface of the base opposite the front surface of the base, heat dissipation fins provided on the rear surface of the base, and a lens mounting portion extending forward from the front surface of the base, the lens mounting portion including a fixing portion provided at a tip of the lens mounting portion and a connection portion connecting the fixing portion to the front surface of the base, and a resin lens is fixed to the fixing portion in a state where it is in contact with the fixing portion.

[0016] With this configuration, even when a resin lens with a low heat resistance temperature (for example, an inexpensive acrylic resin lens) is used, deformation or melting of the resin lens can be suppressed. As a result, it is possible to suppress the occurrence of poor light distribution due to deformation or melting of the resin lens.

[0017] This is because the resin lens is fixed to a lens attachment portion (fixing portion) that extends forward from the front surface of the base.

[0018] In the above heat sink, the connection portion may be formed with a through hole or a notch that penetrates therethrough in the vertical direction.

[0019] With this configuration, the amount of heat transferred to the contact point between the resin lens and the lens attachment part (fixed part) is reduced compared to when no through hole (or notch) is formed in the connection part. This is mainly because the heat dissipation area is increased by the through hole (inner wall of the through hole) formed in the connection part, and heat dissipation is promoted by convection caused by the chimney effect in the through hole (or notch) that penetrates in the vertical direction.

[0020] Therefore, even when a resin lens with a low heat resistance temperature (for example, an inexpensive acrylic resin lens) is used, deformation and melting damage of the resin lens can be further suppressed. As a result, it is possible to further suppress the occurrence of poor light distribution due to deformation and melting damage of the resin lens.

[0021] In addition, in the above-mentioned vehicle lamp, the outer shape of the base portion is rectangular when viewed from the front, the light source is positioned near the center of the front surface of the base when viewed from the front, and the lens mounting portion extends forward from each of the four corners of the front surface of the base. Effect of the Invention

[0022] The present disclosure makes it possible to provide a vehicle lamp and a heat sink that can suppress deformation and melting of a resin lens even when a resin lens with a low heat resistance temperature (for example, an inexpensive acrylic resin lens) is used. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view of a vehicle lamp 10. [Diagram 2] FIG. 2 is a front view of the vehicle lamp 10. [Diagram 3] FIG. 2 is an exploded perspective view of the vehicle lamp 10. [Figure 4] 1A is a front view of the heat sink 40, (b) a top view, (c) a bottom view, (d) a right side view, and (e) a left side view. [Diagram 5] 3 is a cross-sectional view of FIG. 2 taken along line B-B. [Figure 6] 3 is a cross-sectional view taken along line AA in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a vehicle lamp 10 according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. In each drawing, corresponding components are given the same reference numerals, and duplicated explanations will be omitted.

[0025] FIG. 1 is a perspective view of a vehicle lamp 10, FIG. 2 is a front view, and FIG. 3 is an exploded perspective view.

[0026] The vehicle lamp 10 of this embodiment is a vehicle headlamp that functions as a low beam or high beam headlamp, and is mounted on both the left and right sides of the front end of a vehicle such as an automobile (not shown). Since the vehicle lamps 10 mounted on both the left and right sides have a symmetrical configuration, the vehicle lamp 10 mounted on the right side of the front end of the vehicle (the right side when facing the front of the vehicle) will be described below as a representative example.

[0027] As shown in Figs. 1 to 3, the vehicle lamp 10 includes a low beam light source 20A, a high beam light source 20B (hereinafter, when there is no need to distinguish between the two, they will also be referred to as light source 20), a substrate 30 including a substrate front surface 31 on which the light source 20 is mounted and a substrate rear surface on the opposite side, a heat sink 40 arranged behind the light source 20 (substrate 30) to transfer and dissipate heat generated by the light source 20, a resin lens 50 arranged in front of the light source 20 (substrate 30) to control the light emitted by the light source 20, an inner lens 60 arranged between the light source 20 and the resin lens 50, and a heat conductive member 70 arranged between the substrate rear surface and the base front surface 41a. Hereinafter, for convenience of explanation, XYZ axes are defined. As shown in Fig. 2, etc., the X axis extends in the vehicle longitudinal direction, the Y axis extends in the vehicle width direction, and the Z axis extends in the vertical direction.

[0028] The low beam light source 20A and the high beam light source 20B are each a semiconductor light emitting element such as an LED. As shown in FIG. 3, in this embodiment, four low beam light sources 20A are mounted on the upper stage of the front surface of the board in a row spaced apart from each other in the Y-axis direction. Three high beam light sources 20B are mounted on the lower stage of the front surface of the board in a row spaced apart from each other in the Y-axis direction. The number of low beam light sources 20A is not limited to four, and may be one or more. Similarly, the number of high beam light sources 20B is not limited to three, and may be one or more.

[0029] The substrate 30 is made of aluminum. Note that the substrate 30 is not limited to being made of aluminum, and may be made of any metal having high thermal conductivity.

[0030] 4(a) is a front view of the heat sink 40, FIG. 4(b) is a top view, FIG. 4(c) is a bottom view, FIG. 4(d) is a right side view, and FIG. 4(e) is a left side view.

[0031] The heat sink 40 is made of aluminum, and as shown in Figs. 4(a) to 4(e), includes a base portion 41 including a base front surface 41a and a base rear surface 41b on the opposite side thereof, heat dissipation fins 42 provided on the base front surface 41a and the base rear surface 41b, and a lens attachment portion 43 extending forward from the base front surface 41a. The outer shape of the base portion 41 is rectangular when viewed from the front (see Fig. 4(a)). The base front surface 41a is flat. The heat sink 40 is not limited to being made of aluminum, and may be made of a metal having high thermal conductivity. The heat sink 40 is manufactured by casting (die casting), for example. The heat sink 40 may be manufactured by a manufacturing method such as cutting, extrusion, insertion, brazing, etc.

[0032] The lens mounting portion 43 includes a fixing portion 43a provided at the tip of the lens mounting portion 43 and a connecting portion 43b that connects the fixing portion 43a and the base front surface 41a. The lens mounting portions 43 are provided at the four corners of the rectangular base front surface 41a (see FIG. 4(a)).

[0033] The fixing portion 43a has a screw hole H into which a screw N1 (see FIG. 3) is screwed. 43a As shown in Figure 5, the screw hole H 43a is the central axis AX of the fixed portion 43a 43a 5 is a cross-sectional view taken along the line BB in FIG. 2. Note that the central axis AX of the fixed portion 43a 43a extends in the front-rear direction (the X-axis direction or a direction perpendicular to the base front surface 41a).

[0034] The resin lens 50 (flange portion 52a provided at the tip of the leg portion 52) is fixed to the lens attachment portion 43 (fixing portion 43a) extending forward from the base front surface 41a (see FIG. 1).

[0035] The advantage of fixing the resin lens 50 (flange portion 52a) to the lens mounting portion 43 (fixing portion 43a) extending forward from the base front surface 41a in this way is as follows. That is, when the resin lens 50 (flange portion 52a) is fixed to the lens mounting portion 43 (fixing portion 43a) extending forward from the base front surface 41a, the amount of heat transferred to the resin lens 50 (flange portion 52a) is reduced compared to when the resin lens 50 (flange portion 52a) is directly fixed to the base front surface 41a. This is mainly because the heat generated when at least one of the low beam light source 20A and the high beam light source 20B is turned on and transferred in the order of the substrate 30, the heat conductive member 70 arranged between the rear surface of the substrate and the base front surface 41a, the base portion 41, the lens mounting portion 43, and the resin lens 50 (flange portion 52a) is dissipated in the heat conductive member 70.

[0036] Therefore, even when using a resin lens 50 with a low heat resistance temperature (for example, an inexpensive acrylic resin lens), it is possible to suppress deformation and melting damage of the resin lens 50. As a result, it is possible to suppress the occurrence of poor light distribution due to deformation and melting damage of the resin lens 50.

[0037] The two upper left and right connection parts 43b have through holes H 43b In the case where the connection parts 43b are provided on the upper and lower sides, the through hole H is formed in the upper connection part 43b rather than the lower connection part 43b, since the heated air moves upward (see FIG. 3, FIG. 5, etc.). 43b Providing a through hole (or a cutout) is more effective in reducing the heat transferred to the resin lens 50 and lowering the temperature of the resin lens 50. 43b (or a notch) may be formed. 43b (or the notch) is a through hole H 43b The portion is formed in a portion where less heat is transferred to the fixed portion 43a via the connecting portion 43b compared to before the formation of the connecting portion 43b (or the notch). 43a(See Fig. 4(b)). Through hole H 43b (or cutout) Width W in the left-right direction (Y-axis direction) H43b is the width W of the fixing portion 43a in the left-right direction (Y-axis direction) 43a That's all (see Figure 1). 43b The shape of the cutout portion is not limited to a rectangular shape, but may be a circular shape or another shape.

[0038] In this way, the through hole H penetrating the connecting portion 43b in the vertical direction 43b The advantage of forming the through hole H (or the notch) is as follows. 43b When the through hole H (or the notch) is formed in the connection portion 43b, 43b The heat transferred to the resin lens 50 (flange portion 52a) is reduced compared to when the through hole H (or the notch) is not formed. This is mainly due to the 43b (Through hole H 43b The heat dissipation area is increased by the inner wall of the 43b This is because the chimney effect and other factors at the cutouts (or notches) cause convection (see the upward arrows in Figure 5), which promotes heat dissipation.

[0039] Therefore, even when using a resin lens 50 with a low heat resistance temperature (for example, an inexpensive acrylic resin lens), it is possible to further suppress deformation and melting damage of the resin lens 50. As a result, it is possible to further suppress the occurrence of poor light distribution due to deformation and melting damage of the resin lens 50.

[0040] The substrate 30 is fixed (screw-fixed) to the base part 41 with the substrate rear surface and the base front surface 41a facing each other. At this time, a heat conductive member 70 is provided between the substrate rear surface and the base front surface 41a in order to increase the adhesion between them and reduce the contact thermal resistance. The heat conductive member 70 is, for example, a heat conductive grease such as silicone or a heat conductive sheet.

[0041] The resin lens 50 is made of acrylic and has a heat resistance of about 100° C. As shown in FIG. 1, the resin lens 50 is fixed (screw-fixed) to the fixing portion 43a while being in contact with the fixing portion 43a. Specifically, as shown in FIG. 3, the resin lens 50 includes a lens body 51 and a pair of left and right legs 52 extending from both sides of the lens body 51 toward the heat sink 40. A flange portion 52a is provided at the tip of the leg portion 52. Four flange portions 52a are provided corresponding to the four lens attachment portions 43 (fixing portions 43a). The flange portion 52a has a through hole H into which a screw N1 (see FIG. 3) is inserted. 52a Through hole H 52a The screw N1 inserted into the fixing portion 43a is inserted into a screw hole H 43a As a result, the resin lens 50 is fixed (screw-fixed) to the fixing portion 43a in a state of being in contact with the fixing portion 43a (see FIG. 1).

[0042] The lens body 51 is a projection lens (aspheric lens). As shown in FIG. 51 2. The resin lens 50 is disposed near the lower edge of the low beam light exit surface 62A of the low beam light guide lens 60A. FIG 6 is a cross-sectional view taken along the line AA in FIG 2. The resin lens 50 is disposed on the optical axis AX 50 extends in the X-axis direction.

[0043] The inner lens 60 is made of polycarbonate and has a heat resistance of about 140° C. As shown in FIG. 6, the inner lens 60 includes a low beam light guide lens 60A and a high beam light guide lens 60B. The low beam light guide lens 60A is disposed at the focal point F of the resin lens 50 (lens body 51). 51 (and the optical axis AX of the resin lens 50 50 The low beam light guide lens 60A includes a low beam light inlet portion 61A arranged on the rear side of the vehicle, a low beam light outlet surface 62A arranged on the front side of the vehicle, and a low beam light guide portion 63A arranged between the low beam light inlet portion 61A and the low beam light outlet surface 62A.

[0044] Four low beam light inlet sections 61A are provided corresponding to the four low beam light sources 20A (see FIG. 3). The low beam light inlet sections 61A are arranged in a row in the Y-axis direction with the low beam light sources 20A facing each other. Light emitted by the low beam light source 20A enters the low beam light guide lens 60A from the low beam light inlet section 61A that the low beam light source 20A faces. Although not shown, the lower edge of the low beam light exit surface 62A includes a cutoff shape (Z-shaped step portion) that corresponds to the cutoff line that is the upper edge of the low beam light distribution pattern.

[0045] On the other hand, as shown in FIG. 6, the high beam light guide lens 60B has a focal point F 51 (and the optical axis AX of the resin lens 50 50 ) The high beam light guide lens 60B includes a high beam light inlet portion 61B arranged on the rear side of the vehicle, a high beam light outlet surface 62B arranged on the front side of the vehicle, and a high beam light guide portion 63B arranged between the high beam light inlet portion 61B and the high beam light outlet surface 62B.

[0046] Although not shown, three high beam light inlet sections 61B are provided corresponding to the three high beam light sources 20B. The high beam light inlet sections 61B are arranged in a row in the Y-axis direction with the high beam light sources 20B facing each other. The light emitted by the high beam light source 20B enters the high beam light guide lens 60B from the high beam light inlet section 61B that the high beam light source 20B faces. Although not shown, the upper edge of the high beam light output surface 62B includes a cutoff shape (Z-shaped step section) corresponding to the cutoff line that is the lower edge of the high beam light distribution pattern. The inner lens 60 configured as described above is fixed (screw-fixed) to the base section 41 with the low beam light inlet section 61A and the low beam light source 20A facing each other and the high beam light inlet section 61B and the high beam light source 20B facing each other.

[0047] In the vehicle lamp 10 having the above configuration, a low beam light distribution pattern is formed by turning on the low beam light source 20A. The low beam light distribution pattern is formed on a virtual vertical screen (located approximately 25 m forward from the front of the vehicle) facing directly in front of the vehicle.

[0048] Specifically, the low beam light distribution pattern is formed as follows.

[0049] That is, the light emitted by the low beam light source 20A enters the low beam light guide lens 60A from the low beam light entrance portion 61A that the low beam light source 20A faces. A part of the light entering from the low beam light entrance portion 61A is totally reflected by the lower surface of the low beam light guide portion 63A and turned back, and reaches the vicinity of the lower edge of the low beam light exit surface 62A and the optical axis AX of the resin lens 50. 50 The light is emitted from a region adjacent to the low beam light output surface 62A. Meanwhile, the other part of the light is emitted directly from the low beam light output surface 62A. As a result, a low beam light intensity distribution is formed on the low beam light output surface 62A (near the rear focal plane (field curvature)). This low beam light intensity distribution is formed near the lower edge of the low beam light output surface 62A and on the optical axis AX of the resin lens 50. 50 The luminous intensity in the vicinity is relatively high. This low beam luminous intensity distribution is inverted and projected forward by the resin lens 50 to form a low beam light distribution pattern. This low beam light distribution pattern has excellent long-distance visibility with relatively bright areas in the vicinity of the cutoff line and in the vicinity of the intersection of the H line and the V line.

[0050] On the other hand, in the vehicle lamp 10 configured as described above, a high beam light distribution pattern is formed by turning on the high beam light source 20B. The high beam light distribution pattern is formed on a virtual vertical screen facing the front of the vehicle.

[0051] Specifically, the high beam light distribution pattern is formed as follows.

[0052] That is, the light emitted by the high beam light source 20B enters the high beam light guide lens 60B from the high beam light entrance portion 61B that the high beam light source 20B faces. A part of the light entering from the high beam light entrance portion 61B is totally reflected by the upper surface of the high beam light guide portion 63B and turned back, and reaches the vicinity of the upper edge of the high beam light exit surface 62B and the optical axis AX of the resin lens 50. 50 The light is emitted from a region adjacent to the upper edge of the resin lens 50. Meanwhile, another part of the light is emitted directly from the high beam light output surface 62B. As a result, a high beam luminous intensity distribution is formed on the high beam light output surface 62B (near the rear focal plane (field curvature)). This high beam luminous intensity distribution is formed near the upper edge of the resin lens 50 and on the optical axis AX 50 The luminous intensity in the vicinity is relatively high. This high beam luminous intensity distribution is inverted and projected forward by the resin lens 50 to form a high beam light distribution pattern. This high beam light distribution pattern has excellent long-distance visibility with relatively bright areas in the vicinity of the cutoff line and in the vicinity of the intersection of the H line and the V line.

[0053] In addition, in the vehicle lamp 10 having the above-described configuration, by simultaneously turning on the low beam light source 20A and the high beam light source 20B, a composite light distribution pattern can be formed by combining a low beam light distribution pattern and a high beam light distribution pattern.

[0054] Next, a path along which heat generated when at least one of the low beam light source 20A and the high beam light source 20B is turned on is transmitted will be described.

[0055] Heat generated when at least one of the low beam light source 20A and the high beam light source 20B is turned on is transferred in the order of the substrate 30, the heat conductive member 70 disposed between the rear surface of the substrate and the base front surface 41a, the base portion 41, and the heat dissipation fins 42, and is dissipated from the heat dissipation fins 42. At that time, a part of the heat is transferred in the order of the lens attachment portion 43 (connection portion 43b, fixing portion 43a) provided on the base front surface 41a, and the resin lens 50 (flange portion 52a).

[0056] At this time, since the resin lens 50 (flange portion 52a) is fixed to the lens attachment portion 43 (fixing portion 43a) extending forward from the base front surface 41a, the heat transferred to the resin lens 50 (flange portion 52a) is reduced compared to when the resin lens 50 (flange portion 52a) is directly fixed to the base front surface 41a. 43b Since the through hole H (or the notch) is formed in the connection portion 43b, 43b In comparison with the case where the recess (or notch) is not formed, the heat transferred to the resin lens 50 (flange portion 52a) is reduced. Therefore, even when the resin lens 50 with a low heat resistance temperature (for example, an inexpensive acrylic resin lens) is used, the deformation and melting of the resin lens 50 can be further suppressed. As a result, the occurrence of poor light distribution due to the deformation and melting of the resin lens 50 can be further suppressed. Also, as described above, the outer shape of the base portion 41 (base front surface 41a) is rectangular in front view, the low beam light source 20A and the high beam light source 20B are disposed near the center of the base portion 41 (base front surface 41a) in front view, and the lens attachment portion 43 extends forward from the four corners of the base portion 41 (base front surface 41a). In this way, the heat transferred to the resin lens 50 can be further reduced by arranging the light source (low beam light source 20A, high beam light source 20B) as a heat source and the lens attachment portion 43 so that the distance between them is as far as possible.

[0057] Next, the through hole H is formed in the connecting portion 43b in the vertical direction as described above. 43b The effect of forming the cutout portion (or the notch portion) will be described in comparison with a comparative example.

[0058] The vehicle lamp of the comparative example has a through hole H in the connection portion 43b. 43b The above-described vehicle lamp 10 is similar to the vehicle lamp 10 except that no.

[0059] When confirmed by simulation, it was found that in the vehicle lamp of the comparative example, the temperature at the contact point between the resin lens (flange portion) and the heat sink (fixed portion) was a maximum of 101.6°C, exceeding the heat-resistant temperature of the resin lens of 100°C. Therefore, when a through hole H43b was formed in the connection portion 43b in the vehicle lamp 10 of this embodiment, it was found that the temperature at the contact point between the resin lens 50 (flange portion 52a) and the heat sink 40 (fixed portion 43a) dropped by about 3°C, becoming equal to or lower than the heat-resistant temperature of the resin lens 50 of 100°C.

[0060] As described above, the through hole H penetrating the connecting portion 43b in the vertical direction 43b (or a notch) is formed in the connection portion 43b. 43b It can be seen that the amount of heat transferred to the resin lens 50 (flange portion 52a) is reduced compared to when no cutout portion is formed.

[0061] As described above, according to this embodiment, even when a resin lens 50 with a low heat resistance temperature (for example, an inexpensive acrylic resin lens) is used, it is possible to suppress deformation and melting damage of the resin lens 50. As a result, it is possible to suppress the occurrence of poor light distribution due to deformation and melting damage of the resin lens 50.

[0062] This is because the resin lens 50 is fixed to the lens attachment portion 43 (fixing portion 43a) extending forward from the base front surface 41a.

[0063] According to this embodiment, the connecting portion 43b has a through hole H 43b The heat transferred to the resin lens 50 is reduced compared to when the through hole H (or the notch) is not formed. This is mainly due to the 43b (Through hole H 43b The heat dissipation area is increased by the inner wall of the 43b This is because the chimney effect and other factors at the cutouts (or notches) cause convection (see the upward arrows in Figure 5), which promotes heat dissipation.

[0064] Therefore, even when using a resin lens 50 with a low heat resistance temperature (for example, an inexpensive acrylic resin lens), it is possible to further suppress deformation and melting damage of the resin lens 50. As a result, it is possible to further suppress the occurrence of poor light distribution due to deformation and melting damage of the resin lens 50.

[0065] All the numerical values ​​shown in the above embodiment are merely examples, and it goes without saying that other appropriate numerical values ​​can be used.

[0066] The above-described embodiment is merely an example in all respects. The present invention should not be construed as being limited by the description of the above-described embodiment. The present invention can be implemented in various other forms without departing from the spirit or main characteristics thereof. [Explanation of symbols]

[0067] 10...Vehicle lighting fixtures 20…Light source 20A…Low beam light source 20B…High beam light source 30...Substrate 31…Front of board 40…Heat sink 41…Base section 41a…base front 41b…Rear of base 42...Heat dissipation fin 43...Lens attachment part 43a…Fixed part 43b…Connection 50...Resin lens 51...Lens body 52...legs 52a flange 60…Inner lens 60A…Low beam light guide lens 60B…High beam light guide lens 61A…Low beam entrance 61B…High beam entrance 62A…Low beam light output surface 62B…High beam light output surface 63A…Light guide for low beam 63B…High beam light guide 70...Heat conductive material AX 43a ...center axis AX 50 …optical axis F 51 …focus H 43a …Threaded holes H 43b …Through holes H 52a …Through holes N1…Screw

Claims

1. A light source; a substrate including a front surface on which the light source is mounted and a rear surface opposite the front surface; a heat sink disposed behind the light source and configured to transfer and dissipate heat generated by the light source; a resin lens disposed in front of the light source and controlling light emitted by the light source; the heat sink includes a base portion including a base front surface and a base rear surface opposite to the base front surface, a heat dissipation fin provided on the base rear surface, and a lens attachment portion extending forward from the base front surface, the lens mounting portion includes a fixing portion provided at a tip portion of the lens mounting portion and a connecting portion connecting the fixing portion and a front surface of the base, the substrate is fixed to the base portion with the rear surface of the substrate facing the front surface of the base; The resin lens is fixed to the fixing portion in a state of being in contact with the fixing portion.

2. The vehicular lamp according to claim 1 , wherein the connecting portion is formed with a through hole or a notch extending therethrough in a vertical direction.

3. The vehicular lamp according to claim 2, wherein the through hole or the notch is formed in a portion of the connection portion where less heat is transferred to the fixing portion through the connection portion compared to before the through hole or the notch is formed.

4. The vehicular lamp according to claim 3 , wherein the portion is a portion of the connecting portion that includes a central axis of the fixing portion, the central axis extending in the front-rear direction.

5. The vehicular lamp according to claim 2 , wherein a width in the left-right direction of the through hole or the notch is equal to or greater than a width in the left-right direction of the fixing portion.

6. A heat sink that transfers and dissipates heat generated by a light source, a base portion including a base front surface and an opposite base rear surface; A heat dissipation fin provided on a rear surface of the base; a lens attachment portion extending forward from a front surface of the base, the lens mounting portion includes a fixing portion provided at a tip portion of the lens mounting portion and a connecting portion connecting the fixing portion and a front surface of the base, A resin lens is fixed to the fixing portion in a state of being in contact with the fixing portion.

7. The heat sink according to claim 6 , wherein the connection portion is formed with a through hole or a notch extending therethrough in the vertical direction.

8. The outer shape of the base portion is rectangular when viewed from the front, The light source is disposed near the center of the front surface of the base when viewed from the front, The vehicular lamp according to claim 1 , wherein the lens attachment portions extend forward from four corners of a front surface of the base.

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