JP2001184940A - Ventilation structure of vehicle lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent infiltration of water without damaging an appearance. SOLUTION: In a vehicle lamp 11, a light source 17 is arranged in a lamp chamber 16 constituted by having a lens 14 attached to a front opening part of a lamp body 13. The lamp body 13 is formed with a ventilation hole 13c connecting through the chamber 16 with an outside air and a cylindrical shape of boss 31 whose front end has a cap 32 for preventing the infiltration of water with flowing air is arranged in the lamp body 13 with approximately horizontally toward an outside to surround the ventilation hole 13. A blocking wall 33 is formed in the base end of the front boss 31 in the ventilation hole 13c for closing the bottom part of the ventilation hole 13c and blocking the flow of water infiltrating in the inner part of the boss 31 into the lamp chamber 16. A shielding piece 34 is formed in the frond of the ventilation hole for blocking the upper part of the ventilation hole 13c from the lamp chamber and forming a predetermined interval so that the lower circumference of the blocking wall 33 is tilted toward the front form its upper circumference. The boss, the shielding piece and the blocking wall are integrally molded with the lamp body at a position capable of sliding a movable metal mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation structure for a vehicular lamp in which a ventilation hole is formed in a lamp body to communicate a lamp room with the outside air.

[0002]

2. Description of the Related Art As shown in FIG. 5, a vehicular lamp such as a vehicle sidelight or a headlight has a lens 4 mounted on a front opening of a lamp body 3 and is surrounded by the lens 4 and the lamp body 3. A light source (not shown) is provided in the formed light room 6, and the light room 6 is sealed except for a mounting portion of a socket (not shown). However, when the lamp chamber 6 is made to have a sealed structure, each time the light source is turned on or off, the temperature in the lamp chamber 6 changes and the air pressure changes, and the mounting portion of the lamp body 3 and the lens 4 or the mounting of the socket is changed. A respiratory action of sucking in and out of the outside air is performed from the part. When sucking outside air, if moisture is sucked from the mounting portion of the lamp body 3 and the lens 4 or water droplets attached to the mounting portion of the socket enter the lamp chamber 6 and adhere to the light source or the inner surface of the lamp body 3, It degrades the optical performance of the lamp.

For this reason, conventionally, the lamp body 3
A vent hole 3a for communicating the lamp chamber 6 with the outside air is formed in the rear part of the tube, and in order to prevent rainwater or the like from entering through the hole 3a, a cylindrical tube having a water intrusion prevention cap 3b capable of air circulation at the tip is formed. Boss 3c is formed so as to surround the ventilation hole 3a. When the lamp body 3 is a resin molded product, the boss 3c is generally provided on the lamp body 3 substantially horizontally outwardly due to structural restrictions of a mold for molding the lamp body 3. In the lamp 1 in which the ventilation hole 3a and the boss 3c are formed in the lamp body 3 as described above, a breathing action caused by turning on or off the light source is performed through the ventilation hole 3a. At this time, the cap 3b for preventing water intrusion provided at the tip of the boss 3c is attached to the boss 3c.
When the outside air is sucked from the end of the boss 3c, the moisture of the outside air and water droplets attached to the vicinity of the end of the boss 3c are prevented from entering the inside of the boss 3c. It can be prevented from adhering to the inner surface.

[0004]

However, even if a water intrusion prevention cap 3b is provided at the tip of the boss 3c, the cap may be removed when high pressure water is blown, for example, during car washing. 3b for air circulation provided in 3b
d or water enters the inside of the boss 3b through the hole,
There was a problem that the water penetrated into the interior of the lamp room via a. In order to solve this problem, a water adsorbing member such as a sponge 3e is provided on the cap 3b to enhance the function of the cap 3b for preventing intrusion of water. The water once adsorbed on the sponge 3e is pushed out into the boss 3c, and although the amount of water entering the interior of the lamp chamber 6 can be reduced, there is a problem that the intrusion cannot be reliably prevented. SUMMARY OF THE INVENTION An object of the present invention is to provide a ventilation structure for a vehicular lamp that can reliably prevent water from entering the interior of the lamp chamber without impairing the appearance of the lamp.

[0005]

The invention according to claim 1 is
As shown in FIG. 2, a light source 17 is provided in a lamp chamber 16 formed by attaching a lens 14 to a front opening of a lamp body 13.
1, a ventilation hole 13c for communicating the lamp chamber 16 with the outside air is formed in the lamp body 13, and a water intrusion prevention cap 32 capable of circulating air is provided as shown in FIG. The cylindrical boss 31 at the tip is provided with the vent 13
This is an improvement in the ventilation structure of the vehicular lamp provided on the lamp body 13 substantially horizontally outward so as to surround c.

[0006] The characteristic configuration is that a blocking wall 33 for blocking the lower portion of the ventilation hole 13c and blocking the flow of water that has entered the interior of the boss 31 into the lamp chamber 16 is provided in the boss 3 in front of the ventilation hole 13c.
1 at the base end. According to the first aspect of the present invention, even if high-pressure water is blown and water enters the inside of the boss 31 beyond the water intrusion prevention cap 32, the water flows further by the blocking wall 33 and the lamp Room 16
Is prevented from entering.

The invention according to claim 2 is the invention according to claim 1, wherein the upper portion of the ventilation hole 13c is shielded from above the lamp room side, and the lower edge is deviated forward from the upper edge of the blocking wall 33 to a predetermined position. The shielding piece 34 forming the gap of the boss 3 in front of the ventilation hole 13c
1 is a ventilation structure of a vehicular lamp formed at a base end of the vehicle lamp. According to the second aspect of the present invention, even if the lens 14 itself is transparent, the ventilation hole 13c is shielded by the shielding piece 34,
The ventilation hole 13c is not visually recognized from the outside through the lens 14, and the appearance of the lamp is prevented from being deteriorated by the presence of the ventilation hole 13c.

A third aspect of the present invention is the second aspect of the invention, as shown in FIG. 4, wherein the fixed mold 36a and the movable mold 36b are joined to each other and formed in a closed state. After injecting the resin material into 36c and curing it, the movable mold 36b is slid and opened to form the lamp body 13, and the boss 31, the blocking wall 33, and the shielding piece 34 are slidable in the movable mold 36b. This is a ventilation structure for a vehicle lamp integrally formed with the lamp body 13. In the invention according to claim 3, the fixed mold 3
By molding the boss 31, the blocking wall 33, and the shielding piece 34 integrally with the lamp body 13 using a relatively simple mold including the movable mold 6a and the movable mold 36b, the lamp body 13 can be obtained at a relatively low cost. Can be.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 3, a pair of vehicle side lights 11, 11 are attached to both sides of the front end of the vehicle 10, and a pair of headlights are provided on the front of the vehicle 10 adjacent to the vehicle side lights 11, 11. 21 and 21 are respectively attached.
The pair of width lights 11, 11 are turned on to notify the width of the vehicle 10 during night driving to a vehicle traveling in opposition or a third person walking near the vehicle.
A pair of headlights 21 and 21 attached to the front of the vehicle 10
Illuminates the front of the vehicle 10 during night driving to ensure safety during driving. Car width light 11,
11 and the headlights 21 and 21 have the same structure, and therefore, the vehicle width light 11 on the right side of the vehicle will be described below as a representative.

As shown in FIGS. 1 and 2, the vehicle width light 11 has a light source 17 (FIG. 2) disposed in a lamp chamber 16 formed by attaching a lens 14 to a front opening of a lamp body 13. The lens 14 is made of glass or resin.
Is formed to be curved from the front to the side. The lamp body 13 is a resin molded product, and the front surface on the opening side is mirror-finished. A rib 14a protrudes from the rear surface of the lens 14 along the peripheral edge thereof, and a lens receiving portion 13a is provided on the peripheral edge of the lamp body 13 opposed to the rib 14a to hold the tip of the rib 14a via a sealer 18. . A mounting hole 13b (FIG. 2) for a socket 19 is formed in the lamp body 13, and the socket 19 is mounted in the mounting hole 13b so as to seal the lamp chamber 16. Light source is lens 1
The bulb 17 emits light toward the lamp 4, and the bulb 17 is held by the lamp body 13 via a socket 19. A boss 31 is formed in the lamp body 13 of the vehicle width light 11 as a lamp to communicate the lamp chamber 16 with the outside air.

As shown in FIG. 1, the lamp body 13 of the vehicle side light 11 has a ventilation hole 13 for communicating the lamp room 16 with the outside air.
The boss 31 is formed substantially horizontally outward so as to surround the vent hole 13c. This boss 3
Numeral 1 is formed in a cylindrical shape surrounding the air hole 13c, and a water intrusion prevention cap 32 through which air can flow is provided at the tip. The cap 32 in this embodiment is a boss 3
The sponge 32a is provided so as to close the tip of the boss 1 and abuts the tip of the boss. A plurality of grooves 32b for air circulation are formed in the flange portion of the cap 32 fitted around the tip of the boss 31, so that water is relatively unlikely to enter.

A characteristic configuration of the present invention is that a blocking wall 33 for closing the lower part of the ventilation hole 13c and blocking the flow of water that has entered the interior of the boss 31 into the lamp chamber 16 is formed by the boss 31 in front of the ventilation hole 13c. It is located at the base end. On the other hand, an upper part of the ventilation hole 13c is a shielding piece 3 formed in front of the ventilation hole 13c.
4 shielded. The shielding piece 34 shields so as to cover the upper part of the ventilation hole 13c from the upper edge of the ventilation hole 13c obliquely forward and downward, and the lower edge thereof is biased forward from the upper edge of the shielding wall 33 to a predetermined gap. Is formed.

As shown in FIG. 4, the boss 31 and the shielding piece 3
4 and the blocking wall 33 are formed integrally with the lamp body 13 by resin molding using a mold 36. In particular,
After the resin material is injected into the cavity 36c formed in a state where the fixed mold 36a and the movable mold 36b are joined to each other in a closed state and cured, the movable mold 36b is slid in the direction of the arrow in the drawing to open. Thereby, the lamp body 13 is formed. In this case, since the lower edge of the shielding piece 34 is configured to be deviated forward from the upper edge of the shielding wall 33 to form a predetermined gap, it is a mold including the fixed mold 36a and the movable mold 36b. Also, the shielding piece 34 and the shielding wall 33 can be formed at the same time, and the boss 31, the shielding piece 34, and the shielding wall 33 are integrally formed on the lamp body 13 at a position where the movable mold 36b can slide. By integrally molding in this manner, the lamp body 13 can be obtained at a relatively low cost.

In the vehicle width lamp 11 which is a vehicle lamp configured as described above, a breathing action caused by turning on or off the bulb 17 which is a light source is performed through the ventilation hole 13c. Specifically, as shown in the enlarged view of FIG.
When the bulb 17 is turned on and the air in the lamp chamber 16 is inflated, the inflated air is filled in the gap between the lower edge of the shielding piece 34 and the upper edge of the shielding wall 33 as shown by a solid arrow in the drawing. Through the vent hole 13c, through the inside of the boss 31, through the sponge 32a of the water intrusion prevention cap 32, and then diffused to the outside. When the lit bulb 17 is turned off and the air in the lamp chamber 16 contracts, the outside air reaches the sponge 32a via the air circulation groove 32b provided on the cap 32, and the air circulation groove 32b is formed together with the outside air. The sponge 32a adsorbs water droplets and moisture that have entered through the sponge 32a, and the outside air from which the moisture and water droplets have been removed then passes through the boss 31 and passes through the vent hole 13c and the lower edge of the shielding piece 34 as shown by the dashed arrow in the figure. The light passes through a gap between the light-shielding wall 33 and the upper edge of the shielding wall 33 and enters the lamp chamber 16.

In general, the lens 14 of the lamp such as the sidelight 11 has predetermined irregularities for determining the focal point.
Due to the unevenness, the inner surface of the lamp body 13 cannot be clearly seen from the outside of the vehicle 10, and the ventilation hole 13 c does not become visible from the outside through the lens 14. The presence of the ventilation hole 13 c makes the lamp 11 look good. Will not get worse. However, in recent years, in consideration of the design of the entire vehicle, a function of setting a focus on the bulb 17 and the lamp body 13 itself is provided, and the inner surface of the bulb 17 and the lamp body 13 are actively viewed through the lens 14 itself. In some cases. In the ventilation structure of the present invention, the ventilation holes 13c
Is formed, and the upper part of the ventilation hole 13c is shielded by the shielding piece 34 formed in front of the ventilation hole 13c. Therefore, even when the lens 14 itself is made transparent, the ventilation hole 13c The ventilation hole 13c is shielded by the shielding piece 34 and is not visually recognized from the outside through the lens 14, and the appearance of the lamp 11 does not deteriorate due to the presence of the ventilation hole 13c.

On the other hand, when high pressure water is sprayed on the boss 31 such as during car washing, the cap 32
Water may intrude from the air circulation groove 32b, and the water 41 (FIG. 1) may enter the boss 31 beyond the sponge 32a due to high pressure. However, the pressure of the water is reduced by passing through the sponge 32a,
The water 41 that has entered the inside of the boss 31 is vigorously blown by the vent hole 13c.
Does not exceed the blocking wall 33 formed at the base end of the boss 31 in front of the boss 31, and the water 41 adheres to the inner bottom of the boss 31. The water 41 adhering to the inner bottom of the boss 31 then flows toward the cap 32 or the air hole 13c.
Since the blocking wall 33 is formed in 3c, the water 41 is prevented from flowing further by the blocking wall 33 and entering the lamp chamber 16. Therefore, the water 4 adhering to the inner bottom of the boss 31
1 completely flows to the cap 32 side after the end of car washing or the like, is absorbed by the sponge 32a, and is then drained to the outside through the air circulation groove 32b.

[0017]

As described above, according to the present invention, the lower wall of the ventilation hole is closed to block the flow of water that has entered the interior of the boss into the lamp chamber. Even if high pressure water is sprayed and water enters the inside of the boss over the water intrusion prevention cap, the water is prevented from flowing toward the lamp room by the blocking wall, and the water flows into the lamp room. Intrusion can be reliably prevented. Also, if the upper portion of the ventilation hole is shielded from above the lamp room side and the lower edge is deflected forward from the upper edge of the blocking wall to form a predetermined gap, the lens itself can be transparently formed. Even so, since the ventilation hole is shielded by the shielding piece, the ventilation hole is not visually recognized from the outside through the lens, and the appearance of the lamp can be prevented from being deteriorated by the presence of the ventilation hole. Furthermore, if the boss, the shielding piece, and the shielding wall are integrally formed with the lamp body with a mold having a relatively simple structure,
The lamp body can be obtained relatively inexpensively.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line BB of FIG. 2 showing a ventilation structure of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 3 showing the lamp.

FIG. 3 is a front perspective view of a vehicle having the lamp.

FIG. 4 is a cross-sectional view of a mold showing a molding state of the lamp body.

FIG. 5 is a sectional view showing a conventional example and corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Vehicle light (vehicle lamp) 13 Lamp body 13c Vent hole 14 Lens 16 Light room 17 Bulb (light source) 31 Boss 32 Water intrusion prevention cap 33 Blocking wall 34 Shielding piece 36a Fixed mold 36b Movable mold 36c Cavity

Claims (3)

[Claims] 1. A lens at a front opening of a lamp body (13).
(14) a vehicle lamp (11) in which a light source (17) is disposed in a lamp room (16) formed by mounting the lamp room (16), wherein a ventilation hole (13c) for communicating the lamp room (16) with outside air. ) Is formed in the lamp body (13), and a cylindrical boss (31) having a water intrusion prevention cap (32) capable of air circulation at the tip is formed so as to surround the ventilation hole (13c). Substantially horizontally toward the lamp body (13)
In the ventilation structure for a vehicle lighting device provided in the above, a blocking wall for closing a lower portion of the ventilation hole (13c) and blocking the flow of water that has entered the interior of the boss (31) to the lighting chamber (16) ( Three
3) A ventilation structure for a vehicle lamp, wherein 3) is formed at a base end of the boss (31) in front of the ventilation hole (13c). 2. A shielding piece (34) that shields the upper part of the ventilation hole (13c) from above the lamp room side and the lower edge is deflected forward from the upper edge of the shielding wall (33) to form a predetermined gap. The ventilation structure for a vehicle lamp according to claim 1, wherein the ventilation structure is formed at a base end of a boss (31) in front of the ventilation hole (13c). 3. A cavity (36c) formed in a state where the fixed mold (36a) and the movable mold (36b) are joined to each other and are closed.
After the resin material is injected and cured, the movable mold (36b)
To open the lamp body (13), the boss (31), the blocking wall (33), and the shielding piece (34) are slidable by the movable mold (36b). 13)
The ventilation structure for a vehicle lamp according to claim 2, wherein the ventilation structure is formed integrally with the vehicle lamp.