JPS639922Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a new vehicle headlamp, in particular, it removes moisture in the lamp chamber and uses the temperature difference between the lamp chamber and the outside to cool the inner surface of the lens and reflector. An object of the present invention is to provide a new headlamp for a vehicle that prevents fogging from occurring and thereby does not impair the light distribution performance of the lamp, and also prevents dust from entering the lamp chamber. It is something to do.

BACKGROUND TECHNOLOGY AND PROBLEMS Automobile headlights are of a closed type, that is, a light source is enclosed in a space (lamp chamber) formed by a body and a lens attached to the front of the body, and the light source is supplied from the outside. Although many types of bulbs are in use, it is difficult to completely isolate the light chamber from everything outside except for all-glass sealed beam bulbs. For example, since a light bulb base has openings and gaps, moisture adhering to the back of the body through the light bulb base that protrudes outside the body may evaporate and enter the lamp chamber when the light bulb is turned on. Moisture that has entered the lamp chamber in this way condenses on the low-temperature parts of the lens and reflecting mirror, causing fog. In addition, moisture adhering to the lamp base is sucked into the lamp chamber due to a drop in pressure within the lamp chamber when the lamp is turned off, and this moisture evaporates when the lamp is turned on or due to heat from direct sunlight, resulting in a dew point and cloudiness. Further, even if there is no intrusion of moisture from the outside, water vapor remaining in the lamp chamber may cause a sudden drop in temperature in the outside world, causing the dew point to drop and causing cloudiness.

If cloudiness like the one described above occurs on the inner surface of the lens or reflective mirror surface, it will reduce the amount of light transmitted through the lens and reduce the reflection efficiency of the reflective mirror, thereby interfering with the light distribution function of the headlight. result.

Therefore, various attempts have been made to prevent the occurrence of cloudy weather as described above, but none of them can be said to have fully achieved their purpose. In particular, most attempts to completely seal the lamp chamber from the outside air either do not yield satisfactory results or have drawbacks such as being impractical due to the enormous increase in cost.

Therefore, an attempt was made to prevent fogging by forming ventilation holes in the upper and lower parts of the lamp chamber to communicate with the outside and utilizing the air convection that occurs when the lamp is lit. Some have a groove formed at the joint with the lens and communicate the lamp chamber with the outside through this groove, and this has achieved some degree of effectiveness, but others actively communicate the lamp chamber with the outside. Therefore, there is a drawback that moisture, dust, etc. from the outside air directly enters the lamp chamber.

Purpose of the invention Therefore, the present invention was developed to prevent fogging of the lens etc. by communicating the inside of the lamp chamber with the outside air, and to prevent moisture and dust from entering the lamp chamber from the outside as much as possible. It is intended to provide illumination.

Summary of the invention In order to achieve the above object, the vehicle headlamp of the invention covers the front opening of the lamp body or the reflector with a lens, and the lamp body or the reflector is defined by the lens. In a vehicle headlamp with a light source located indoors, a recess is formed in the lens installation groove formed at the opening edge of the lamp body or reflector, and the recess protrudes rearward from the rear end of the opening. The recess and the outside of the light chamber are communicated by a vent having a length at least twice the depth, and a notch is provided on the side wall of the light chamber of the recess to communicate the recess and the inside of the light chamber on the left and right sides of the vent. The vent pipe and the cutout are formed at different positions, and the space between the vent pipe and the notch serves as a vent pipe that communicates between the lamp chamber and the outside of the light room, and a lid member that is engaged with the opening side of the recess has a direction in which the vent pipe extends. It is characterized by providing a weir portion that protrudes in substantially orthogonal directions.

Therefore, according to the present invention, by communicating the outside air inside the lamp chamber, it is possible to prevent the lens etc. from fogging up, and it is also possible to prevent moisture and dust from entering the lamp chamber from the outside.

Embodiments Hereinafter, details of the vehicle headlamp of the present invention will be explained with reference to drawings showing specific embodiments.

First Embodiment Figures 1 to 9 show the first embodiment of the vehicle headlight of the present invention.
This is an example of the following. The headlamp 1 is arranged in a space (light chamber) 4 defined by a body 2 made of synthetic resin, a lens 3 that covers a front opening of the body 2, and the body 2 and the lens 3. Reflector 5
and a light bulb 7 arranged such that the light source section (filament) 6 is at a predetermined position with respect to the reflecting mirror 5.

Reference numeral 8 denotes a flange formed on the outer circumferential surface of the opening of the body so as to protrude outward from the edge of the body opening, and the flange 8 has a lens installation groove 9 opened at its front surface. The rear end edge of the lens 3 is brought into contact with the lens installation groove 9 via the gasket 10, and in this state, the lens 3 is attached to the body by an appropriate means (for example, a clamping member such as a C-shaped clip). It is fixed at 2. 11 is a rear opening of the body 2.

Reference numerals 12 and 13 are ventilation groove forming portions provided at positions near both sides of the lower portion of the lens installation groove 11. The ventilation groove forming parts 12 and 13 communicate the lamp chamber 4 with the outside of the lamp chamber by a recess formed in the lens installation groove 9 and a lid member that is removably engaged with the opening side of the recess. A ventilation groove is formed, and both ventilation groove forming portions 12 and 13 have substantially the same structure.

Hereinafter, one of the ventilation groove forming portions 12 will be explained (see FIGS. 4 to 9).

14 is a recess formed in the lens installation groove 9, and 15 is a front opening of the recess 14. Reference numeral 16 denotes a communication port formed on the left side of the inner surface of the recess 14. A suction port 18 extends rearward from the communication port 16, and the rear end of the suction port 18 is connected to the outside. There is an opening 19 to the opening 19. Reference numerals 20 and 20 denote engaging step portions formed by cutting out the left and right corners of the front opening 15 of the recess 14 in a substantially L-shape. Both ends are engaged. 21 is a dam provided on the side of the recess 14. The weir portion 21 is opened from a position slightly to the right of the position where the communication port 16 is formed on the back surface 17.
5, and its tip is connected to the opening 15.
and the inner surface 17, and its upper and lower edges are respectively connected to the ceiling 2 of the recess 14.
2 and the bottom surface 23. 24 is the right side surface 26 of the recess 14 in the inner wall 25 of the lens installation groove.
This is a notch formed in a portion corresponding to the portion closer to the side, and the back end 27 of the notch 24 is formed at a position close to the back surface 17 of the recess 14 . 28
is a protrusion that protrudes forward from the right side of the rear end 27 of the notch 24.

29 is a lid member for closing the front opening 17 of the recess 16. Reference numeral 30 denotes a long plate-shaped substrate having approximately the same size as the front opening 15 of the recess 14, and a portion near the right side of the upper edge of the substrate 30 is engaged with the front portion of the notch 24. An eaves portion 31 to be fitted protrudes forward, and two eaves portions protrude rearward from a position slightly to the right from the center of the inner surface of the board 30 and are spaced apart from each other to some extent.
Two weir parts 32 and 33 are formed. The rearwardly projecting lengths of the weir parts 32 and 33 are slightly shorter than the length between the inner surface 17 of the recess 14 and the front opening 15, and the heights of the weir parts 32 and 33 are , the length is approximately equal to the length between the ceiling portion 22 and the bottom surface 23 of the recessed portion 14.

Thus, the cover member 29 engages both ends of the substrate 30 with the engagement steps 20, 20 of the recess 14,
The visor 31 is fitted to the recess 14 so as to engage with the front portion of the notch 24 and cover the front opening 15 of the recess 14. As a result, the front opening 15 of the recess 14 is closed and the lens installation groove 9 of the body 2 is closed.
A ventilation groove 34 is formed in the direction in which the cutout 24 extends, and the rear portion of the cutout 24 is in contact with the ventilation groove 34.
and a lamp chamber side opening 35 which communicates with the lamp chamber 4.
Therefore, the lamp chamber 4 is connected to the outside of the lamp through the ventilation groove 34.
The lamp communicates with the outside of the lamp through 5-vent groove 34-communication port 16-intake port 18-lamp outer opening 19. Narrowed flow paths 36a, 36b, and 36c are formed in the ventilation groove 34 by the dam parts 21, 32, and 33. That is, narrowed flow paths 36a, 36b, and 36c are formed between the tip edge of the dam part 21 provided on the recess 14 side and the inner surface of the base plate 30 of the cover member, and have a width significantly narrower than that of the ventilation groove 34.
Similar narrowed flow paths 36b and 36c are formed between the end edges of the weir portions 32 and 33 provided on the cover member 29 side and the inner surface 17 of the recess 14.

Thus, the air that has flowed into the lamp 1 from the lamp outer opening 19 flows into the lamp chamber 4 through a path as shown by the broken line arrow in FIGS. 8 and 9. That is, the air that has flowed into the lamp 1 from the lamp outer opening 19 flows through the suction port 18 and from the communication port 16 into the space located on the left side of the ventilation groove 34, and first passes through the lid member 2.
9 collides with the inner surface of the substrate 30. Part of the air that has collided with the inner surface of the substrate 30 flows into the space between the weir part 21 and the weir part 32 through the narrow channel 36a, and the other part flows into the ventilation groove 36. Convection occurs in the space closer to the left side of the recess 14, or after colliding with the left side surface 37 of the recess 14, the air flows into the space through the narrow channel 36a. The air passing through the narrowed flow path 36a is increased in flow velocity and collides with the side surface of the weir portion 32, and from there, the air passes through the narrowed flow path 36a again.
b to the right side of the ventilation groove 34. The air passing through the narrowed flow path 36b is increased in flow velocity here as well, but the air passing through the narrowed flow path 36b is
After passing b, the flow path is extremely widened, so the flow velocity of the air is significantly attenuated here. Therefore, most of the air that has passed through the narrowed flow path 36b causes convection within the space between the weir parts 32 and 33, and then passes through the narrowed flow path 36c to the space on the right side of the ventilation groove 34. flows into. And the narrowed flow path 36c
The flow velocity of the air passing through is increased here as well, so that it impinges on the right side surface 26 of the recess 14. The air that has collided with the right side surface 26 of the recess 14 changes its flow direction upward, and flows into the lamp chamber 4 through the lamp chamber inner side opening 35.

In this way, the air flowing in from outside the lamp has its flow direction and flow velocity repeatedly changed on its path until it flows into the lamp chamber 4. Therefore, even if dust is mixed in the air flowing in from outside the lamp, the dust will be absorbed by the air from the ventilation groove 3.
When the air collides with each side surface or dam in the ventilation groove 34, when air convection occurs, or when the flow velocity of the air is attenuated, it is deposited on the bottom surface 23 of the ventilation groove 34 or attached to each wall surface. There is almost no possibility that it will be carried into the lamp chamber 4 along with the air.

The lid member 29 engaged with the front opening 15 of the recess 14 is maintained in that state by placing the gasket 10 and the rear edge of the lens 3 in the lens installation groove 9.

Incidentally, the reflecting mirror 5 is made of metal, and has an opening formed in its rear part, and a cylindrical receiving part 38 that protrudes rearward from the opening, and is fixed to the base part of the light bulb 7 in the receiving part 38. A flange 39 is fixed in an internal fit.

40 is a ball receiver made of synthetic resin attached to a bracket 41 fixed to the back side of the upper part of one side edge of the reflector 5, and the tip is formed at the other end of a fulcrum rod 42 whose tip is screwed into the body 2. ball 43
are fitted to form a ball joint. 44 is a synthetic resin nut fixed to a bracket 45 fixed to the back side of the upper part of the other side edge of the reflecting mirror 5. Reference numeral 46 denotes an adjusting rod, whose intermediate portion is rotatably but non-slidably fitted into the body 2, and whose tip portion is fitted into the nut 44.
are screwed together. Asia Staining Rod 46
An integral flange 47 is formed in the middle of the body 2, and the rod 46 is inserted into an insertion hole 48 formed in the body 2 until the flange 47 comes into contact with the rear surface of the body 2. Then, a synthetic resin cap 50 with a rod insertion hole 49 formed in the center is inserted into the rod insertion hole 46.
The rear part of the rod 46 is inserted through the flange 47, and the front end of the side edge of the cap 50 is fixed to the rear surface of the body 2 by welding or the like, so that the rod 46 is supported relative to the body 2 so as to be rotatable and non-slidable. Ru. In addition, 51 has tsuba 47 and body 2 for waterproofing.
This is an O-ring interposed between the cap 50 and the rear surface, and 52 is a projection for positioning the cap 50. Reference numeral 53 denotes a knob having a knurled surface 54 for preventing slippage, and the rod 46 is attached to the body 2 as described above.
It is fixed to the rear end of the rear rod 46 attached to. However, this Asia Stein Rod 46
When the nut 44 is rotated, its tip is screwed into or unscrewed from the nut 44.
4 approaches or separates from body 2. The mechanism consisting of the nut 44, the bracket 45, and the adjusting rod 46 is also provided below the ball joint section consisting of the ball receiver 40, the bracket 41, and the fulcrum rod 42. The mirror 5 is supported at three points with respect to the body 2 so as to be able to freely adjust its angle.

Reference numeral 55 denotes a rubber cover that closes the rear opening of the body 2, and connects the thickened annular body attachment portion 56 and the similarly annular bulb fitting portion 57 between the two thickened portions 56, 57. A thin connecting portion 58 is integrally formed. An annular groove 59 is formed on the inner surface of the body attachment portion 56, and the annular groove 59 is fitted with an annular flange 60 formed on the rear end edge of the body 2 opening 11. A body attachment portion 56 is attached to the body 2. Further, the tip end of the body attachment portion 56 is made thinner as it goes forward to form an annular lip portion 61, and this lip portion 61 is brought into close contact with the rear surface of the body 2 to seal this portion. Reference numeral 62 denotes a passage formed between the upper part of the body mounting part 56 and the connecting part 58, which communicates the inside and outside of the cover 55. The annular light bulb fitting part 57 is fitted onto the base 63 of the light bulb 7 that protrudes rearward from the receiving part 38 of the reflector 5, thereby creating a gap between the rear part of the body 2 and the rear part of the reflector 5. The created space is passage 62
It is occluded except for a portion.

Reference numeral 64 denotes a recessed portion formed approximately at the center of the upper inner surface of the body 2 so as to extend in the front-rear direction. is formed.

In the above-mentioned automobile headlamp 1, when the light bulb 7 is turned on, the temperature inside the lamp chamber 4 increases and air convection occurs. This convection flows through a passage 62 communicating with the outside at the upper part of the lamp.
is provided, the air with high temperature and high moisture content is discharged to the outside from the upper passage 62, and is instead discharged through the lamp outer opening 19- and the inlet 1.
8 - Communication port 16 - Ventilation groove 34 - Light room side opening 35
Outside air is introduced into the light chamber 4 through the above, and moisture in the light chamber 4 is successively discharged to the outside of the light chamber 4 to prevent fogging.

Note that the upper part of the reflector 5, especially the central part, becomes high temperature, but if the recess 64 extending in the front-rear direction is formed at approximately the center of the upper inner surface of the body 2, as shown in the above embodiment, this temperature can be reduced. In the part, reflector 5 and body 2
The gap between the reflector 5 becomes larger and a large amount of air flows through the gap, which has the effect of lowering the temperature at the center of the upper part of the reflecting mirror 5.

Second Embodiment FIGS. 10 to 14 show a ventilation groove forming portion 65 in a second embodiment of the vehicle headlamp of the present invention. Note that the ventilation groove forming portion 6 shown in this embodiment
5 is different from the ventilation groove forming part 12 in the first embodiment described above, in that a step part is formed at the inlet having an opening on the outside of the lamp at its tip to change the direction of air flow, Since the weir part provided in the lid member is formed only on the lid member,
Only these different parts will be explained, and other parts that are not different will be given the same reference numerals as those given to similar parts in the above-described embodiments, and the explanation will be omitted.

Ventilation groove 34a and suction hole 18 in this embodiment
The communication opening 16a that communicates with the inner surface 1 of the recess 14
It is formed at the left end of 7. The upper and lower surfaces of the suction port 18a are lowered in the direction in which the suction port 18a extends from the approximate center thereof to the outside opening 19 of the lamp than the portion from the center to the communication port 16a. Stepped parts 66, 67
Therefore, the suction port 18a is bent upward at the center by the stepped portions 66 and 67. 24a is the inner wall 25 of the lens installation groove 9
This notch is formed by cutting out a portion of the recess 14 that corresponds to the right side surface 26, and the notch 24a is cut out to a position where the inner surface 17 of the recess 14 is formed. 68 is the inner wall 25
A notch is formed by cutting out a portion of the recess 14 that corresponds to the left side surface 37, and the rear end 69 of the notch 68 is located at the front opening 15 of the recess 14.
It is notched to the corresponding position.

Reference numeral 29a is a lid member, and the lid member 29a has an eaves portion 7 projecting forward on the top of the base plate 30a.
0 is formed, and plate-shaped protrusions 71 and 72 that engage with the respective notches 24a and 68 are protrudingly provided at positions near both left and right ends of the eaves portion 70. Then, from both sides of the center part of the inner surface of the substrate 30a,
2a, 33a protrude rearward. Thus, the lid member 29a engages both ends of the substrate 30a with the engagement steps 20, 20 of the recess 14, and also connects the protrusion 71 to the front half of the notch 24a and the protrusion 72.
are engaged with the notches 68, respectively, and the recess 1
It is attached to the recessed part 14 so as to cover the front opening 15 of 4. This covers the front opening 15 of the recess 14, thereby forming a ventilation groove 34a that extends in the direction in which the lens installation groove 9 of the body 2 extends, and only the front half of the notch 24a is closed. Therefore, a lamp chamber inner side opening 35a is formed which communicates the ventilation groove 34a and the lamp chamber 4. In addition, 73a, 73b
are weir parts 32a and 3 provided on the lid member 29a side.
3a and the narrowed flow path formed between each tip edge of the recess 14 and the inner surface 17 of the recess 14.

Thus, the air that has flowed into the lamp 1 from the lamp outer opening 19 flows into the lamp chamber 4 through a path as shown by the broken line arrow in FIGS. 12 and 14.
That is, the air flowing into the lamp 1 from the lamp outer opening 19 first collides with the stepped portion 66 while passing through the suction port 18a, and its flow direction is changed. The air that has collided with the stepped portion 66 flows upward while causing turbulence there, and collides with the upper surface of the suction port 18a. From there, it flows into the space on the left side of the ventilation groove 34a through the communication port 16a, and collides with the inner surface of the substrate 30a of the lid member 29a. The air that collided with the inner surface of the substrate 30a causes a turbulent flow phenomenon, convects in the space near the left side of the ventilation groove 34a, and passes through the narrowed channels 73a and 73b to the right side of the ventilation groove 34a. flows towards. The flow velocity of the air passing through the narrowed channel 73a is increased here, but since the flow channel is widened after passing the narrowed channel 73a, the flow velocity is significantly attenuated here. Therefore, most of the air that has passed through the narrow channel 73a causes convection within the space between the dams 32a and 33a, and after convecting, passes through the narrow channel 73b and approaches the right side of the ventilation groove 34a. Flow into position. The air passing through the narrowed flow path 73b is increased in flow velocity here as well, so that it collides with the right side surface 26 of the recess 14. The air that has collided with the right side surface 26 of the recess 14 changes its flow direction upward, and flows into the lamp chamber 4 through the lamp chamber inner side opening 35a.

As described above, in this embodiment, the air flowing in from the outside opening 19 of the lamp has its flow direction significantly changed in the suction port 18a before reaching the ventilation groove 34a, and turbulence is caused. The dust contained therein settles to some extent before reaching the ventilation groove 34a or adheres to the wall surface of the suction port 18a. Therefore, the ventilation groove 34a
The weir part provided inside can be omitted, and the structure of the ventilation groove 34a can be simplified.

Effects of the idea As is clear from what has been described above,
The vehicle headlamp of the present invention is a vehicle headlamp in which the front opening of the lamp body or the reflector is covered with a lens, and the light source is placed inside the lamp chamber defined by the lamp body or the reflector and the lens. In the lamp, a recess is formed in the lens installation groove formed in the opening edge of the lamp body or the reflector, and the lens protrudes backward from the rear end of the opening and has a length that is at least twice the depth of the recess. The recess is communicated with the outside of the lamp chamber by a ventilation tube, and a notch is formed on a wall surface of the light chamber side of the recess to communicate the recess and the inside of the lamp chamber, and is shifted from the left and right sides of the ventilation tube. and the notch serves as a ventilation tube that communicates the lamp chamber with the outside of the lamp chamber, and a lid member that is engaged with the opening side of the recess has a dam portion that projects in a direction substantially perpendicular to the direction in which the ventilation tube extends. It is characterized by having been established.

Therefore, according to the present invention, it is possible to prevent fogging by causing air convection within the lamp chamber, and
Dust can be removed from the air entering the lamp chamber, ensuring that it is always in the best possible condition. In particular, in the present invention, a ventilation pipe is used which protrudes rearward from the rear end of the opening and has a length more than twice the depth of the recess, and the recess and the inside of the lamp chamber are formed on the side wall of the recess. Since the communicating notch is formed by shifting the position to the left and right from the ventilation cylinder, it is almost impossible for water or dust to enter the lamp chamber from outside the lamp chamber. In addition, since the ventilation groove is constituted by a recess formed at the opening edge of the front surface of the lamp and a lid member attached to the opening side of the recess, which is separate from the lamp, the ventilation groove can be It is possible to easily form a weir part with a complicated shape.

In each of the embodiments described above, the lamp body and the lens attached to the front opening of the lamp body define the lamp chamber, and the recess forming the ventilation groove is formed at the edge of the opening of the lamp body. However, in the vehicle headlamp of the present invention, a lens is attached to the front opening of the reflector, and a light chamber is defined by the reflector and the lens. However, the concave portion constituting the ventilation groove may be formed in the lens installation groove formed at the opening edge of the reflecting mirror.

In each of the embodiments described above, the narrowed flow path formed in the ventilation groove is connected to the tip edge of each dam part and the front side surface (inner surface of the substrate of the lid member) or rear side surface (inner surface of the substrate of the lid member) of the ventilation groove. This is because the upper or lower edge of each weir and the upper side surface (ceiling surface of the recess) or lower side surface (the bottom surface of the recess) of the ventilation groove. It may be configured between the two types, or a combination of these forms may be used.

In each of the above embodiments, the opening of the ventilation groove outside the lamp was formed through the inlet.
By doing this, it is possible to increase the turbulence of the air flowing into the lamp, and it is also possible to lengthen the ventilation path for the air to reach the lamp chamber. The effect of removing dust can be increased.

[Brief explanation of the drawing]

Figures 1 to 9 show the first part of the vehicle headlight of the present invention.
Fig. 1 is a front view with the lens and gasket removed, Fig. 2 is a sectional view taken along line A-A in Fig. 1 with the lens and gasket attached, and Fig. 3 is a front view of the lens and gasket removed. is a sectional view taken along line B-B in Figure 1 with the lens and gasket attached;
Figures 9 to 9 are enlarged views of the part where the ventilation groove is formed in the lens installation groove of the lamp body with the lens and gasket removed. Front view with removed
5 is a plan view, FIG. 6 is an exploded perspective view, FIG. 7 is a sectional view taken along the line C-C in FIG. 4 with the lid member attached to the recess, and FIG. 4 is a cross-sectional view taken along the line D-D in FIG. 4, FIG. 9 is a cross-sectional view taken along the line E-E in FIG. This is an enlarged view of the part where the ventilation groove is formed in the lens installation groove of the lamp body in this example, with the lens and gasket removed. Figure 10 is an exploded perspective view, and Figure 11 is the recess that forms the ventilation groove. 12 is a sectional view taken along line FF in FIG. 11, FIG. 13 is a plan view with the lid member engaged in the recess, and FIG. 14 is a front view with the member removed. FIG. 12 is a sectional view taken along line GG in FIG. 11 with the lid member engaged with the recess. Explanation of symbols, 1... Headlight, 2... Lamp body, 3... Lens, 4... Light chamber, 5... Reflector,
6... Light source, 9... Lens installation groove, 14... Recess, 15... Opening of the recess, 18... Ventilation tube, 1
9...Light room outer opening, 21...Weir part, 29, 29
a...Lid member, 32, 33, 32a, 33a...
Weir part, 24, 24a... Notch, 34, 34a...
Ventilation groove, 35, 35a...Light room inner side opening.

Claims (1)

[Scope of utility model registration request] In a vehicle headlamp, the front opening of the lamp body or the reflector is covered with a lens, and the light source is arranged in a lamp chamber defined by the lamp body or the reflector and the lens, wherein the lamp body or the reflector is A concave portion is formed in the lens installation groove formed at the edge of the opening, and a vent tube that protrudes rearward from the rear end of the opening and has a length at least twice the depth of the concave portion is connected to the concave portion. A notch is formed on a wall surface of the light chamber side of the recessed portion to communicate the recessed portion with the inside of the light chamber, and is shifted from the left and right sides of the ventilation tube, and a gap between the ventilation tube and the notch is formed in the light chamber. and a ventilation tube that communicates with the outside of the lamp room, and a lid member that is engaged with the opening side of the recess is provided with a dam that protrudes in a direction substantially perpendicular to the direction in which the ventilation tube extends. Headlights.