Lamp housing for vehicle lighting fixture, vehicle lighting fixture

Abstract

To provide a lamp housing of a vehicular lamp fitting which can inhibit occurrence of dew condensation on an inner surface of a lamp lens, and to provide the vehicle lamp fitting.SOLUTION: The invention relates to a lamp housing 3 which forms a lamp chamber 10 with a lamp lens 2. An air circulation duct 6 having a hollow structure is provided within the lamp housing 3. An opening 60 which allows the lamp chamber 10 and the air circulation duct 6 to communicate with each other is provided at a portion, which faces the interior of the lamp chamber 10, of the lamp housing 3. As a result, the invention can inhibit occurrence of dew condensation on the inner surface of the lamp lens.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a lamp housing for a vehicle lamp, and also to a vehicle lamp. [Background technology]

[0002] A vehicle lamp that suppresses the occurrence of condensation inside the lamp chamber is, for example, shown in Patent Document 1. Patent Document 1 will be described below.

[0003] The vehicle lamp of Patent Document 1 has a lamp chamber formed by a lamp body and a translucent cover, and the lamp body and the translucent cover are each provided with a breathing structure.

[0004] The breathing structure of the lamp body is formed by forming a boss portion on the lamp body, forming an air hole in the boss portion to connect the space inside and outside the lamp chamber, fitting a filter into a cap, and attaching the cap to the boss portion.

[0005] The breathing structure of the light-transmitting cover is formed by forming a vent hole in the light-transmitting cover that connects the space inside and outside the lamp chamber, and by attaching a filter to the light-transmitting cover and blocking the vent hole with the filter.

[0006] The vehicle lamp of Patent Document 1 can suppress condensation inside the lamp chamber by connecting the inside and outside of the lamp chamber via the ventilation holes in the lamp body and the translucent cover. Moreover, the vehicle lamp of Patent Document 1 can prevent water from entering the lamp chamber through the ventilation holes in the lamp body and the translucent cover using the filters in the lamp body and the translucent cover. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2018-45879 Summary of the Invention [Problem to be solved by the invention]

[0008] As described above, in such vehicle lamps, it is important to prevent condensation from forming on the inner surface of the translucent cover (lamp lens).

[0009] An object of the present invention is to provide a lamp housing for a vehicle lamp and a vehicle lamp that can suppress the occurrence of condensation on the inner surface of a lamp lens. [Means for solving the problem]

[0010] The lamp housing of a vehicle lamp of this invention is a lamp housing of a vehicle lamp that forms a lamp chamber together with a lamp lens, and is characterized in that a hollow air circulation duct is provided inside the lamp housing, and an opening is provided in the lamp housing at a location facing the interior of the lamp chamber, which connects the interior of the lamp chamber with the interior of the air circulation duct.

[0011] In the lamp housing of the vehicle lamp of this invention, a plurality of air circulation ducts and openings are provided, and it is preferable that the plurality of air circulation ducts and openings are set in greater numbers in at least one of the areas of the lamp housing where the air flow within the lamp chamber is likely to stagnate, or the areas where the heat generation temperature from the light source placed within the lamp chamber is high, than in other areas.

[0012] In the lamp housing of the vehicle lamp of this invention, it is preferable that a plurality of air circulation ducts and openings are provided, and the cross-sectional areas of the plurality of air circulation ducts and openings are set larger in at least one of the areas of the lamp housing where the air flow within the lamp chamber is likely to stagnate, or the area where the heat temperature generated by the light source placed within the lamp chamber is high, than in other areas.

[0013] In the lamp housing of the vehicle lamp of the present invention, the dimensions of the air circulation duct and the opening in the thickness direction of the lamp housing are preferably half or approximately half the thickness of the lamp housing.

[0014] In the lamp housing of the vehicle lamp of this invention, the lamp housing has a main body portion which is partially open, and a sealing portion which is provided at the edge of the opening of the main body portion and in which the lamp lens is sealed, and it is preferable that the opening is provided at a position in the sealing portion which faces the inside of the lamp chamber, and that the air circulation duct is provided so as to penetrate through the inside of the main body portion and the inside of the sealing portion and communicate with the inside of the lamp chamber via the opening.

[0015] In the lamp housing of the vehicle lamp of the present invention, it is preferable that the lamp housing is made of a 3D printed body produced by a 3D printer.

[0016] The vehicle lamp of the present invention is characterized by comprising a lamp lens forming a lamp chamber, a lamp housing of the vehicle lamp of the present invention, and a light source unit or lamp unit arranged within the lamp chamber.

[0017] In the vehicle lamp of the present invention, it is preferable that at least one of the lamp housing and the lamp lens is provided with a breathing structure that communicates between the inside and outside of the lamp chamber. [Effects of the Invention]

[0018] The lamp housing of the vehicle lamp and the vehicle lamp of the present invention can suppress the occurrence of condensation on the inner surface of the lamp lens. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view showing an embodiment of a lamp housing for a vehicle lamp and a vehicle lamp according to the present invention. [Figure 2]FIG. 2 is a vertical cross-sectional view (cross-sectional view taken along line II-II in FIG. 1) showing the state of air circulation within the lamp chamber. [Figure 3] FIG. 3 is a partially enlarged vertical cross-sectional view (enlarged vertical cross-sectional view of part III in FIG. 2) showing the state of air circulation within the lamp chamber. [Figure 4] FIG. 4 is a front view showing the lamp housing with the lamp lens removed. [Figure 5] 5 is a partially enlarged vertical cross-sectional view showing the air circulation duct and opening of the lamp housing (a partially enlarged vertical cross-sectional view corresponding to FIG. 3, and a partially enlarged cross-sectional view taken along line VV in FIG. 4). [Figure 6] Fig. 6 is a partially enlarged front view showing the air circulation ducts and openings of the lamp housing. Fig. 6(A) is an enlarged front view of part VIA in Fig. 4 showing the sparsely arranged air circulation ducts and openings. Fig. 6(B) is an enlarged front view of part VIB in Fig. 4 showing the densely arranged air circulation ducts and openings. [Figure 7] FIG. 7 is an explanatory diagram showing the lamp housing being produced (shaped) using a 3D printer. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (example) of a lamp housing for a vehicle lamp and a vehicle lamp according to the present invention will be described in detail below with reference to the drawings.

[0021] In this specification, the terms front, rear, top, bottom, left and right refer to the front, rear, top, bottom, left and right when the vehicle lamp according to the present invention is mounted on a vehicle.

[0022] It should be noted that the drawings are schematic diagrams showing a lamp housing of a vehicle lamp and a vehicle lamp according to the present invention, and therefore detailed portions of the lamp housing of the vehicle lamp and a vehicle lamp according to the present invention are omitted from the drawings, and some hatching is also omitted.

[0023] (Description of the configuration of the embodiment) The lamp housing of the vehicle lamp according to this embodiment and the configuration of the vehicle lamp will be described below. In the drawings, reference numeral 1 denotes the vehicle lamp according to this embodiment (hereinafter simply referred to as "vehicle lamp").

[0024] (Description of vehicle lighting fixture 1) In this example, the vehicle lamp 1 is a rear combination lamp, and is provided on each of the left and right sides of the rear of the vehicle.

[0025] As shown in Figures 1 to 3, the vehicle lamp 1 comprises a lamp lens (or a light-transmitting cover) 2, a lamp housing (or a lamp body, hereinafter simply referred to as the "lamp housing") 3 of the vehicle lamp according to this embodiment, a light source unit 4, and a breathing grommet 5 as a breathing structure.

[0026] The lamp lens 2 and the lamp housing 3 are attached to each other. As a result, the lamp lens 2 and the lamp housing 3 form a lamp chamber 10. The lamp lens 2 and the lamp housing 3 can be attached to each other by laser welding, ultrasonic welding, heat welding, adhesives such as hot melt, or mechanical attachment using screws.

[0027] (Explanation of Lamp Lens 2) The lamp lens 2 is a design component of the vehicle lamp 1. The lamp lens 2 is, for example, a transparent outer cover or outer lens. In this example, the lamp lens 2 is made of a light-transmitting resin material such as PC or PMMA. As shown in FIGS. 1 to 3 , the lamp lens 2 has a main body portion 20 and a seal portion 21.

[0028] The main body 20 has an open rear portion and closed front and side portions. The front (and sometimes the side portions) of the main body 20 form part of the design surface of the rear of the vehicle.

[0029] The seal portion 21 is integrally provided around the entire periphery of the opening edge portion of the main body portion 20. The seal portion 21 of the lamp lens 2 has a convex shape.

[0030] (Explanation of lamp housing 3) The lamp housing 3 is a non-design and mounting part of the vehicle lamp 1. The lamp housing 3 is made of, for example, a light-impermeable material (such as a resin material). As shown in FIGS. 1 to 5, the lamp housing 3 has a main body portion 30 and a seal portion 31.

[0031] The main body 30 has an open front and closed rear and side surfaces. A vehicle body mounting portion 32, a light source unit mounting portion 33, and a breathing grommet mounting portion 34 are integrally formed on the main body 30.

[0032] The seal portion 31 is integrally provided around the entire periphery of the opening edge of the main body portion 30. The seal portion 31 of the lamp housing 3 has a concave shape. The seal portion 21 of the lamp lens 2 and the seal portion 31 of the lamp housing 3 are sealed to each other via the seal member 11.

[0033] The vehicle body mounting portions 32 are provided at four corners of the outer surface of the lamp housing 3 (the surface opposite to the surface facing the lamp chamber 10). Each of the four vehicle body mounting portions 32 is attached to the vehicle body. In this way, the vehicle lamp 1 is attached to the vehicle.

[0034] The light source unit mounting portion 33 is composed of four bosses. The four light source unit mounting portions 33 are provided on the inner surface (the surface facing the lamp chamber 10) of the lamp housing 3, one above the other, and one on the left and one on the right. Ribs 35 are integrally formed on the two upper and lower light source unit mounting portions 33 on the left and right.

[0035] The breathing grommet mounting portions 34 are cylindrical and are provided at the upper left and upper right sides on the outer surface of the lamp housing 3. Each of the two breathing grommet mounting portions 34 on the left and right sides is provided with a breathing hole 36 that connects the inside of the lamp chamber 10 to the outside.

[0036] (Explanation of light source unit 4) The light source unit 4 is a light source component of the vehicle lamp 1. As shown in Fig. 2, the light source unit 4 has a substrate 40, and a light emitting element (not shown) and a circuit element (not shown) mounted on the substrate 40. Note that the light source component of the vehicle lamp 1 may be something other than the light source unit 4 in this example, such as a light source bulb.

[0037] The substrate 40 is attached to the light source unit attachment portion 33 of the lamp housing 3. This allows the light source unit 4 to be disposed within the lamp chamber 10. The light-emitting element is a self-luminous semiconductor light-emitting element (semiconductor light-emitting element) such as an LED, OEL, or OLED (organic EL). The light-emitting element emits light toward the lamp lens 2.

[0038] (Explanation of breathing grommet 5) In this example, the breathing grommet 5 is made of an elastic material such as synthetic rubber or synthetic resin. As shown in Fig. 2, the breathing grommet 5 is made of a U-shaped tubular member in which an upper part and a lower part are integrally connected by a curved middle part.

[0039] An upper portion of the breathing grommet 5 is fitted from the outside into the breathing grommet mounting portion 34 of the lamp housing 3. A lower portion of the breathing grommet 5 faces a position of the lamp housing 3 that is lower than the breathing grommet mounting portion 34.

[0040] The inside of the breathing grommet 5 of the tubular member and the breathing holes 36 of the breathing grommet mounting portion 34 allow breathable communication between the inside and outside of the lamp chamber 10. The breathing grommet 5 and the breathing grommet mounting portion 34 form a breathing structure. Incidentally, by providing the breathing structure with a breathable waterproof filter, it is possible to prevent water from entering the lamp chamber 10.

[0041] (Explanation of air circulation pipe 6 and opening 60) As shown in Figures 2 to 7, a hollow air circulation duct 6 is provided inside the lamp housing 3. An opening 60 is provided in the lamp housing 3 at a location facing the inside of the lamp chamber 10. The opening 60 connects the inside of the lamp chamber 10 with the inside of the air circulation duct 6. An opening 60 is provided at each end of the single air circulation duct 6. The hollow structure of the air circulation duct 6 is not particularly limited and may be a cylinder or a prism, as shown in Figure 7.

[0042] The opening 60 is provided in the sealing portion 31 of the lamp housing 3, in a portion of the sealing leg (foot portion, rib portion) on the inside of the recess (on the lamp chamber 10 side) that faces the inside of the lamp chamber 10. The air circulation duct 6 is provided so as to penetrate through the inside of the main body portion 30 and the inside of the sealing portion 31 of the lamp housing 3, and communicates with the inside of the lamp chamber 10 via the two openings 60, one at the top and one at the bottom.

[0043] There are provided a plurality of air circulation ducts 6 and openings 60. The plurality of air circulation ducts 6 and openings 60 are arranged more (more densely, at a higher density) in the lamp housing 3 at a portion where the air flow in the lamp chamber 10 is likely to be stagnant and at a portion where the heat temperature generated by the light source, i.e., the light source unit 4, arranged in the lamp chamber 10 is high, than in other portions.

[0044] In this example, there are two locations where the air flow inside the lamp chamber 10 is likely to stagnate: the upper left acute corner (wraparound portion) and the upper right acute corner (wraparound portion) of the vehicle lamp 1. The volume inside the lamp chamber 10 at these two locations is smaller than the volume inside the lamp chamber 10 at other locations. For this reason, the air flow inside the lamp chamber 10 is likely to stagnate at these two locations. The openings 60 on the upper sides at these two locations are set more numerous (more densely, at a higher density) than the openings 60 on the oblique sides at these two locations.

[0045] In this example, more air circulation ducts 6 and openings 60 are provided in areas where the air flow is likely to be stagnant and where the heat generation temperature is high. Note that the provision of more air circulation ducts 6 and openings 60 may be in at least one of areas where the air flow is likely to be stagnant and areas where the heat generation temperature is high.

[0046] The dimension t of the air circulation duct 6 and the opening 60 in the thickness direction of the lamp housing 3 is about 0.5 mm to about 1.0 mm. On the other hand, the thickness dimension T of the lamp housing 3 is about 2 mm. As a result, the dimension t of the air circulation duct 6 and the opening 60 in the thickness direction is half or almost half the thickness dimension T of the lamp housing 3.

[0047] (Explanation of how to make lamp housing 3 using a 3D printer) As shown in FIG. 7, the lamp housing 3 is made of a 3D printed body produced by a 3D printer.

[0048] The 3D printer extrudes hot-melt resin 70 from the nozzle 7 while scanning the nozzle 7 as shown by the solid arrow in Figure 7 to form one layer. During the scanning of one layer, the extrusion of the hot-melt resin 70 is stopped at the locations corresponding to the air circulation duct 6 and the opening 60 to form a hollow portion 71. Once the formation of one layer is completed, a new layer is formed on top of the previous layer. By stacking multiple layers, the lamp housing 3 composed of a 3D printed body is produced (formed). In this example, the thickness of one layer is approximately 0.1 mm to approximately 0.2 mm. Note that the thickness of one layer is shown enlarged in Figure 7.

[0049] The 3D printer that produces the lamp housing 3 may also be one that produces the lamp housing 3 by a method other than the above-mentioned method.

[0050] (Explanation of the operation of the embodiment) The lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment are configured as described above, and their operation will be described below.

[0051] The light emitting elements of the light source unit 4 are turned on by supplying power (current) to them. Then, light is emitted from the light emitting elements of the light source unit 4 toward the lamp lens 2, passes through the lamp lens 2, and is irradiated to the outside in a predetermined lamp light distribution pattern.

[0052] As shown by the dashed arrows in Figure 2, the interior of the lamp chamber 10 is ventilated via the breathing grommet 5 of the breathing structure and the breathing holes 36 of the breathing grommet mounting portion 34. Air within the lamp chamber 10 circulates through the air circulation duct 6 and the opening 60 as shown by the solid arrows in Figures 2, 3, and 5. Note that the air within the lamp chamber 10 may also circulate in the opposite direction to the direction of the solid arrows in Figures 2, 3, and 5.

[0053] This makes it possible to prevent condensation from forming on the inner surface of the lamp lens 2. Furthermore, it is possible to cool the light source unit 4, which becomes hot due to heat generated when the light emitting elements are turned on.

[0054] (Explanation of Effects of the Embodiments) The lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment have the above-described configuration and function, and the effects thereof will be described below.

[0055] The lamp housing 3 of the vehicle lamp according to this embodiment, and the vehicle lamp 1 according to this embodiment, have an opening 60 at a location of the lamp housing 3 facing the interior of the lamp chamber 10, an air circulation duct 6 extending through the lamp housing 3, and the air circulation duct 6 communicating with the interior of the lamp chamber 10 via the opening 60.

[0056] As a result, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment can circulate the air in the lamp chamber 10 through the air circulation duct 6 and the opening 60 within the lamp chamber 10 as shown by the solid arrows in Figures 2, 3 and 5. As a result, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment can suppress the occurrence of condensation on the inner surface of the lamp lens 2.

[0057] Furthermore, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment are provided with a hollow air circulation duct 6 and opening 60 in the lamp housing 3, which allows the lamp housing 3 to be made lighter and contributes to being carbon-free.

[0058] Furthermore, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment can circulate the air within the lamp chamber 10 within the lamp chamber 10 by means of the hollow air circulation duct 6 and opening 60 provided in the lamp housing 3, and the internal volume of the lamp chamber 10 can be increased.Therefore, even if the internal volume of the vehicle lamp 1 is reduced, condensation on the inner surface of the lamp lens 2 can be suppressed, and the vehicle lamp 1 can be made smaller and thinner.

[0059] Furthermore, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment can suppress the occurrence of condensation on the inner surface of the lamp lens 2, so there is no need to apply anti-fog paint to the inner surface of the lamp lens 2, thereby reducing costs.

[0060] In the lamp housing 3 of the vehicle lamp according to this embodiment and in the vehicle lamp 1 according to this embodiment, a plurality of air circulation ducts 6 and openings 60 are provided, and the plurality of air circulation ducts 6 and openings 60 are set in greater numbers in parts of the lamp housing 3 where the air flow in the lamp chamber 10 is likely to stagnate than in other parts.

[0061] As a result, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment can efficiently suppress the occurrence of condensation on the inner surface of the lamp lens 2.

[0062] Furthermore, in the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment, a plurality of air circulation ducts 6 and openings 60 are provided, and the plurality of air circulation ducts 6 and openings 60 are set in greater numbers in areas of the lamp housing 3 where the heat temperature generated by the light source unit 4 arranged in the lamp chamber 10 is higher than in other areas.

[0063] As a result, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment can efficiently cool the light source unit 4 which becomes hot due to heat generated when the light emitting elements are turned on.

[0064] In the lamp housing 3 of the vehicle lamp 1 according to this embodiment, the dimension t in the thickness direction of the lamp housing 3 at the air circulation duct 6 and the opening 60 is half or approximately half the thickness dimension T of the lamp housing 3.

[0065] As a result, the lamp housing 3 of the vehicle lamp according to this embodiment, and the vehicle lamp 1 according to this embodiment, can reliably pass the air circulation duct 6 through the interior of the lamp housing 3, thereby achieving the above-mentioned effect of suppressing condensation, and furthermore, the strength (rigidity) of the lamp housing 3 can be maintained as before.

[0066] The lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment have an opening 60 provided in the sealing portion 31 of the lamp housing 3 and an air circulation duct 6 penetrating through the main body portion 30 of the lamp housing 3 and the inside of the sealing portion 31. This means that an air circulation path (see the solid arrows in Figures 2, 3 and 5) can be formed over a wide area within the lamp chamber 10 (or over the entire lamp chamber 10), thereby reliably achieving the above-mentioned effect of suppressing condensation.

[0067] The lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment are configured from a 3D printed body produced by a 3D printer. As a result, the lamp housing 3 of the vehicle lamp according to this embodiment and the vehicle lamp 1 according to this embodiment can produce (shape) the lamp housing 3 having the air circulation duct 6, which cannot be produced (shaped) by injection molding.

[0068] The vehicle lamp 1 of this embodiment is provided with a breathing structure in the lamp housing 3 that connects the inside of the lamp chamber 10 with the outside of the lamp chamber 10, namely, a breathing grommet mounting portion 34, a breathing hole 36, and a breathing grommet 5, so that breathing within the lamp chamber 10 can more efficiently suppress the occurrence of condensation on the inner surface of the lamp lens 2.

[0069] (Explanation of examples other than the embodiment) In the above embodiment, a rear combination lamp is described as the vehicle lamp 1. However, the present invention can also be applied to vehicle lamps other than rear combination lamps, such as front combination lamps or other lamps.

[0070] In addition, in the above embodiment, the number of air circulation ducts 6 and openings 60 in areas where the air flow within the lamp chamber 10 is likely to stagnate and in areas where the heat generation temperature due to the light source units 4 arranged within the lamp chamber 10 is high is set to be greater than the number of air circulation ducts 6 and openings 60 in other areas.

[0071] However, in this invention, the cross-sectional areas of the air circulation duct 6 and the openings 60 in areas where the air flow in the lamp chamber 10 is likely to be stagnant or where the heat temperature generated by the light source unit 4 disposed in the lamp chamber 10 is high may be set larger than the cross-sectional areas of the air circulation duct 6 and the openings 60 in other areas. In this case, the same effects as those of the above-described embodiment can be achieved.

[0072] Furthermore, in the above-described embodiment, the breathing grommet 5, breathing grommet mounting portion 34, and breathing hole 36 of the breathing structure are provided in the lamp housing 3. However, in the present invention, the breathing grommet, breathing grommet mounting portion, and breathing hole of the breathing structure may be provided in the lamp lens 2, or the breathing grommet, breathing grommet mounting portion, and breathing hole of the breathing structure may be provided in the lamp housing 3 and the lamp lens 2.

[0073] Furthermore, in the above embodiment, the light source unit 4 is disposed within the lamp chamber 10. However, in the present invention, a lamp unit may be disposed within the lamp chamber 10 instead of the light source unit 4. The lamp unit is composed of, for example, a lamp member, a light source unit, a heat sink, and holding members such as brackets that hold these members.

[0074] It should be noted that the present invention is not limited to the above-described embodiment. [Explanation of symbols]

[0075] 1 Vehicle lighting fixtures 10 Light room 11 Sealing material 2 Lamp Lens 20 Main body part 21 Seal part 3. Lamp housing (lamp housing for vehicle lighting fixtures) 30 Main body part 31 Seal part 32 Body mounting part 33 Light source unit mounting part 34 Breathing grommet mounting part 35 Ribs 36 breathing hole 4 Light source unit 40 boards 5 Breathing grommet (breathing structure) 6 Air circulation line 60 aperture 7 nozzles 70 Hot Melt Resin 71 Hollow part T Plate thickness dimension t: Dimension in the thickness direction (inner diameter)

Claims

1. A lamp housing for a vehicle lamp that forms a lamp chamber together with a lamp lens, The lamp housing has a hollow air circulation duct inside. An opening is provided in the lamp housing at a location facing the interior of the lamp chamber, allowing the interior of the lamp chamber to communicate with the interior of the air circulation duct, a plurality of the air circulation ducts and a plurality of the openings are provided, The cross-sectional areas of the plurality of air circulation ducts and the openings are set larger in at least one of a portion of the lamp housing where the air flow in the lamp chamber is likely to be stagnant and a portion of the lamp housing where the heat generation temperature due to the light source disposed in the lamp chamber is high than in other portions. A lamp housing for a vehicle lamp.

2. A lamp housing for a vehicle lamp that forms a lamp chamber together with a lamp lens, The lamp housing has a hollow air circulation duct inside. An opening is provided in the lamp housing at a location facing the interior of the lamp chamber, allowing the interior of the lamp chamber to communicate with the interior of the air circulation duct, The dimensions of the air circulation duct and the opening in the thickness direction of the lamp housing are half or approximately half of the thickness of the lamp housing. A lamp housing for a vehicle lamp.

3. a plurality of the air circulation ducts and a plurality of the openings are provided, the plurality of air circulation ducts and the plurality of openings are set in at least one of a portion of the lamp housing where the air flow in the lamp chamber is likely to be stagnant and a portion of the lamp housing where the heat temperature generated by the light source disposed in the lamp chamber is high, more than in other portions; 3. The lamp housing for a vehicle lamp according to claim 2.

4. a plurality of the air circulation ducts and a plurality of the openings are provided, The cross-sectional areas of the plurality of air circulation ducts and the openings are set larger in at least one of a portion of the lamp housing where the air flow in the lamp chamber is likely to be stagnant and a portion of the lamp housing where the heat generation temperature due to the light source disposed in the lamp chamber is high than in other portions.

3. The lamp housing for a vehicle lamp according to claim 2.

5. A lamp housing for a vehicle lamp that forms a lamp chamber together with a lamp lens, The lamp housing has a hollow air circulation duct inside. An opening is provided in the lamp housing at a location facing the interior of the lamp chamber, allowing the interior of the lamp chamber to communicate with the interior of the air circulation duct, The lamp housing includes: a main body portion having a portion opened; a seal portion provided at an opening edge portion of the main body portion, to which the lamp lens is sealed; and The opening is provided in a portion of the sealing portion facing the interior of the lamp chamber, The air circulation duct is provided to penetrate the interior of the main body portion and the interior of the sealing portion, and communicates with the interior of the lamp chamber through the opening. A lamp housing for a vehicle lamp.

6. a plurality of the air circulation ducts and a plurality of the openings are provided, the plurality of air circulation ducts and the plurality of openings are set in at least one of a portion of the lamp housing where the air flow in the lamp chamber is likely to be stagnant and a portion of the lamp housing where the heat temperature generated by the light source disposed in the lamp chamber is high, more than in other portions; 6. The lamp housing for a vehicle lamp according to claim 5.

7. a plurality of the air circulation ducts and a plurality of the openings are provided, The cross-sectional areas of the plurality of air circulation ducts and the openings are set larger in at least one of a portion of the lamp housing where the air flow in the lamp chamber is likely to be stagnant and a portion of the lamp housing where the heat generation temperature due to the light source disposed in the lamp chamber is high than in other portions.

6. The lamp housing for a vehicle lamp according to claim 5.

8. The lamp housing includes: a main body portion having a portion opened; a seal portion provided at an opening edge portion of the main body portion, to which the lamp lens is sealed; and The opening is provided in a portion of the sealing portion facing the interior of the lamp chamber, The air circulation duct is provided to penetrate the interior of the main body portion and the interior of the sealing portion, and communicates with the interior of the lamp chamber through the opening.

5. The lamp housing for a vehicle lamp according to claim 2.

9. a lamp lens forming a lamp chamber and a lamp housing of the vehicle lamp according to any one of claims 1 to 8; a light source unit or a lamp unit disposed in the lamp chamber; Equipped with A vehicle lamp characterized by:

10. At least one of the lamp housing and the lamp lens is provided with a breathing structure that communicates between the inside and outside of the lamp chamber.

10. The vehicle lamp according to claim 9.

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