JPH10275501A - Vehicle lighting - Google Patents

Abstract

(57) [Summary] [Problem] To reduce the pressure difference caused by blinking of a light bulb or the like in a vehicle lamp, even if a breathing port is provided directly in the lamp room, the lamp room is sealed to reduce the volume. Even when a variable portion is provided, fogging eventually occurs and cannot be solved. SOLUTION: According to the present invention, a main breathing port 6 in which ventilation resistance when outside air flows into and out of a lamp room 4 is appropriately set.
And a secondary breathing port 7 having a high ventilation resistance with respect to the main breathing port 6, and an elastic bag 8 formed of a flexible film member and provided in the light chamber 4 is connected to the main breathing port 6. The auxiliary breathing port 7 is a vehicle lamp 1 that communicates the lamp chamber 4 with the outside air, so that the main breathing port 6 and the auxiliary breathing port 7 are provided. By allowing the ventilation inside the lamp chamber 4 to be performed directly, and by setting the ventilation volume to a small value, the absolute amount is small even if water is sucked into the lamp room 4 and the ventilation is reduced when exhausting. The task is to solve the problem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp such as a headlamp and a tail lamp, and more particularly, to a gas in a hermetically sealed lamp chamber which expands due to heat generated when a light bulb is turned on, thereby increasing the internal pressure. Thus, the present invention relates to a vehicular lamp having a configuration in which a breathing port is provided to reduce deformation of a lens or the like.

[0002]

2. Description of the Related Art An example of the structure of this type of conventional vehicle lamp is disclosed in Japanese Utility Model Laid-Open No. 2-123005, for example. In addition to being formed as a closed structure, an opening for replacing the light source bulb is closed by a bellows-shaped rubber elastic rear cover.

[0003] The effect of this is that a completely sealed structure is employed, so that when the outside air temperature rises or when the light source bulb is turned on, heat such as air in the lamp chamber expands and the internal pressure rises. For example, in order to prevent deformation of a housing, a lens, or the like, the rear cover is extended by elasticity of a formed member, and the rear cover is intended to be relaxed by increasing the volume in the lamp room.

When the light source bulb shifts from on to off or when the outside temperature decreases, the volume of the gas in the lamp chamber decreases, so that the internal pressure also decreases. It is said that the rear cover is shortened and the volume in the lamp room is reduced, so that the pressure difference with respect to the outside air pressure in the lamp room is reduced as described above.

[0005]

However, in the vehicle lamp of the above-mentioned conventional construction, since the rear cover is formed of a member having rubber elasticity, the rear cover is expanded and contracted to change the internal volume. Requires sufficient pressure to deform the rear cover in opposition to the rubber elasticity.

The pressure difference caused by turning on and off the light source bulb is at most 0.2 atm. If the rear cover is formed so as to have a sufficient thickness to maintain its shape, the pressure difference is as large as the above. The difference does not cause deformation to such an extent that the effect can be obtained, and therefore, the pressure in the lamp room is still changed, and it is difficult to achieve the object.

For example, when the vehicular lamp is a headlamp, even if it has a standard volume, the volume of gas to be absorbed by the rear cover in consideration of environmental conditions and the like is about 600 ml. However, there is a problem that it cannot be accommodated with the volume of the rear cover.

Further, when the lamp chamber is completely sealed as described above, after a certain period of time has elapsed, a member constituting the vehicle lamp, for example, the release of water contained in a lens or the like, or the member described above, Due to the moisture that penetrates due to the permeability of the lamp, the humidity in the lamp room will gradually increase,
Due to the hermetically closed state, there is no means for discharging this humidity, and there is a problem that clouding occurs, and solving these points has been an issue.

[0009]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, there is provided a vehicular lamp in which a light room is provided with a breathing port for outside air. Is a main breathing port set as appropriate ventilation resistance when outside air flows into and out of the light room,
The main breathing port is provided with a sub-breathing port having a high ventilation resistance, and the main breathing port is connected to an elastic bag formed in a bag shape with a flexible thin film-shaped member and provided in a lamp chamber. It is an object of the present invention to solve the problem by providing a vehicular lamp characterized in that the room is sealed with respect to the outside air, and the auxiliary breathing port directly connects the lamp room to the outside air.

[0010]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a vehicle lamp according to the present invention. The vehicle lamp 1 has a light chamber 4 formed by a housing 2 and a lens 3, and the light chamber 4 is provided with a breathing port. This is similar to the conventional example in that the pressure change in the lamp chamber 4 caused by the flickering of the light bulb 5 is communicated with the outside air to reduce it.

Here, in the present invention, the main breathing port 6 and the sub-breathing port 7 are provided as the above-mentioned breathing ports. At this time, as shown in FIG.
Is connected to an end portion on the side of the light room 4 by using a flexible and thin film-shaped member such as high-density polyethylene or polypropylene, and an elastic bag 8 formed in a bag shape is used. Are stored in the elastic bag 8.

Therefore, the elastic bag 8 does not have rubber elasticity as in the conventional example, and can respond to a very small pressure difference. Incidentally, in actual implementation, in order to facilitate the assembling into the housing 2, it is folded as shown in the drawing, and when the assembly is completed, an appropriate amount of air is sent from the main breathing port 6 to inflate. It is good.

On the other hand, the auxiliary breathing port 7 is formed so as to directly communicate the inside of the lamp chamber 4 with the outside air.
At this time, a conventionally used waterproof tube 9 is attached to a portion of the auxiliary breathing opening 7 outside the lamp chamber 4 to prevent, for example, external moisture such as raindrops from directly reaching.

Therefore, when the inside of the lamp chamber 4 has a negative pressure with respect to the outside air, in the configuration of the present invention, the outside air is sucked from both the main breathing port 6 and the auxiliary breathing port 7. Here, in the present invention, the main breathing port 6 is low in the ventilation resistance of both the ports 6 and 7 by providing a difference in the opening diameter between the main breathing port 6 and the sub-breathing port 7, and the Make a difference to be higher,
A difference is provided between the amount of outside air sucked from the main breathing port 6 and the auxiliary breathing port 7.

Here, the relationship between the opening diameter and the airflow resistance will be specifically described. The airflow is proportional to the fourth power of the radius r according to Hagenpoazoie's law. What is necessary is just to determine the opening diameter from the main breathing port 6 to the auxiliary breathing port 7 so as to obtain the ratio. In the actual implementation, appropriate adjustment is necessary because, for example, the resistance of the path to the breathing ports 5 and 6 also affects the resistance.

At this time, the elastic bag 8 is attached to the vehicular lamp 1.
It is preferable that the main breathing port 6 is provided in the vicinity of the lowermost position of the lamp chamber 4 in a state where it is located below the lamp chamber 4 in a state where the lamp is mounted on the vehicle. . This is because, as described above, the main breathing port 6 is set to have a low airflow resistance, so that when the outside air is sucked, a large amount of the air is sucked, and there is a high possibility that the water is sucked together. It is.

That is, if the moisture is sucked together and the moisture stays in the elastic bag 8, the elastic bag 8 is finally filled with water and the internal pressure due to the change in the volume of the elastic bag 8 described later. This is because there is a possibility that the function of alleviating the illness cannot be achieved. By providing the main breathing port 6 as described above,
The water that has entered the elastic bag 8 can be prevented from discharging by gravity and staying in the elastic bag 8.

The function and effect of the auxiliary breathing port 7 will be described in detail in addition to the difference in airflow resistance with the main breathing port 6 described above. It is preferable to make the airflow resistance higher when performing the process, and to lower the airflow resistance when exhausting from the interior of the lamp chamber 4 to the outside air.

Therefore, in this embodiment, the auxiliary breathing port 7
It operates in a direction to close the auxiliary breathing port 7 when sucking outside air and operates in a direction to open the auxiliary breathing port 7 when exhausting air. For example, a thin film formed of a thin rubber plate Valve 7
a is provided to achieve the above object.

However, the thin film valve 7a is provided with an appropriate bypass means such as a groove so that the auxiliary breathing port 7 is not completely closed even when operated in the closing direction. The thin film valve 7a does not need to be provided in contact with the auxiliary breathing port 7, and may be provided, for example, in the waterproof tube 9. In FIG. 1, reference numeral 10 denotes a reflecting mirror, and reference numeral 11 denotes an extension. The vehicle lamp 1 is formed by these components.

Next, the operation and effect of the vehicle lamp 1 of the present invention having the above-described configuration will be described. First, when the bulb 5 is turned off or when the outside air temperature decreases and the internal pressure of the lamp chamber 4 decreases, the outside air is sucked into the lamp chamber 4 through the main breathing port 6 and the sub-breathing port 7.

At this time, as described above, a difference in ventilation resistance is provided between the main breathing port 6 and the auxiliary breathing port 7, and the auxiliary breathing port 7 is operated so as to increase the ventilation resistance at the time of suction. Since the thin-film valve 7a is provided, the ventilation resistance is further increased. For example, 99% from the main breathing port 6 and 1% from the sub-breathing port 7 correspond to the amount of outside air corresponding to the difference in ventilation resistance. Will be sucked.

The outside air sucked from the main breathing port 6 inflates the elastic bag 8 and is stored therein. However, since the elastic bag 8 is separated from the lamp chamber 4, for example, Even when the outside air contains a large amount of moisture, the moisture does not enter the light room 4 and a small amount of moisture enters the light room 4 via the auxiliary breathing port 7. That is, the absolute amount of water sucked into the lamp chamber 4 can be significantly reduced.

When the bulb 5 is turned on or the outside air temperature rises and the internal pressure of the lamp chamber 4 rises, the internal pressure compresses the elastic bag 8, and the gas inside the elastic bag 8 is released to the outside air through the main breathing port 6. At the same time, the gas in the lamp chamber 4 is also released to the outside air through the auxiliary breathing port 7.

At this time, the thin-film valve 7a provided in the sub-breathing port 7 operates to reduce the ventilation resistance, so that the ventilation resistance becomes close to a set value such as a difference in the opening diameter. 90% of the
A larger amount, such as 0%, than that at the time of suction is discharged through the auxiliary breathing port 7. Therefore, even if the light room 4 is ventilated and moisture is present inside, the lighting room 4 is turned on and off. In the process of repetition, it is sequentially released to the outside.

FIG. 3 shows another embodiment of the present invention. In the previous embodiment, the auxiliary breathing port 7 was provided at one place provided in the housing 2, for example. Then, the auxiliary breathing port 12 is along the direction where the outside air flows in and out,
The first auxiliary breathing port 12a and the second auxiliary breathing port 12b are provided with an appropriate distance between them.

Between the first sub-respiratory port 12a and the second sub-respiratory port 12b, an external air stagnation chamber 12 having an increased cross-sectional area with respect to the sub-respiratory ports 12a and 12b to secure an appropriate volume is provided.
c is provided. Further, the thin film valve 12d as described in the previous embodiment is provided in one of the first auxiliary breathing port 12a and the second auxiliary breathing port 12b. still,
Also in this embodiment, connection of the waterproof tube 9 and the like are free.

By doing so, in the auxiliary breathing port 12 of this embodiment, a small amount of outside air is retained in the outside air stagnation chamber 12c due to the operation of the thin film valve 12d at the time of suction. It does not reach the inside of the room 4. Therefore, no matter how much moisture is contained in the outside air, the moisture does not enter the lamp room 4.

When the bulb 5 is turned on, the gas in the lamp chamber 4 expands and is discharged. At this time, as described in the previous embodiment, the gas in excess of the suctioned gas is discharged. Therefore, the outside air in the outside air stagnation chamber 12c is completely replaced by the gas in the lamp chamber 4, and no moisture remains in the outside air stagnation chamber 12c. Therefore, it is possible to expect further moisture proof performance for the lamp room 4.
Since the operation and effects other than those described above are exactly the same as those of the previous embodiment, the detailed description is omitted here.

In the embodiments of the present invention, the vehicle lamp 1 is described as an example in which the vehicle lamp 1 is a headlamp, but this may be another illumination lamp such as a fog lamp, or a tail lamp. For example, a lamp for a signal may be used, and a lamp for use other than a vehicle lamp such as a street lamp may be implemented as long as the lamp needs to adjust the internal pressure.

[0031]

As described above, according to the present invention, as the breathing port, a main breathing port having an appropriate ventilation resistance when outside air flows into and out of the lamp room, and a ventilating port for the main breathing port are provided. An auxiliary breathing port with a high resistance is provided, and the main breathing port is formed of a flexible thin film-like member in a bag shape and is connected to an elastic bag provided in the lamp chamber, so that the lamp chamber is sealed from outside air. The auxiliary breathing port is made into a state, and the auxiliary breathing port is a vehicle lamp that directly communicates the light chamber with the outside air, so that the elastic bag is formed of a flexible thin film member having no rubber elasticity, so that expansion and contraction can be performed. A device that responds with a slight pressure difference when it is performed, enables highly accurate internal pressure adjustment, and can reliably prevent deformation, etc., and is extremely effective in improving the performance of vehicle lamps It is.

Further, a main breathing port and a sub-breathing port are provided, and the ventilation in the lamp room is directly performed by the sub-breathing port. In addition, since the ventilation volume is set to be small, moisture in the lamp room is reduced. Even if inhaled, the absolute amount is small, and ventilation is performed during exhaust to prevent water from permanently staying in the lamp room and prevent clouding gradually during use. As a result, an extremely excellent effect is also achieved in improving the reliability of the vehicular lamp.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a vehicular lamp according to the present invention.

FIG. 2 is a perspective view showing a main part of the same embodiment.

FIG. 3 is a cross-sectional view showing another embodiment of the vehicular lamp according to the present invention in a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Housing 3 ... Lens 4 ... Light room 5 ... Light bulb 6 ... Main breathing hole 7 ... Sub-breathing hole 7a ... Thin film valve 8 ... Expansion bag 9 ... Waterproof tube 10 Reflector 11 Extension 12 Sub-breathing hole 12a First sub-breathing hole 12b Second sub-breathing hole 12c Outside air retention chamber 12d Thin film valve

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[Procedure amendment]

[Submission date] April 11, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

Continued on the front page (72) Inventor Yoshihiro Nakata 2-9-13-1 Nakameguro, Meguro-ku, Tokyo Inside Stanley Electric Co., Ltd. (72) Inventor Tatsuya Umeyama 2-9-1-13 Nakameguro, Meguro-ku, Tokyo Stanley Inside Electric Co., Ltd. (72) Tadashi Kawachi 2-9-13-1 Nakameguro, Meguro-ku, Tokyo Stanley Inside Electric Co., Ltd. (72) Takao Zama 2-9-1-13 Nakameguro, Meguro-ku, Tokyo Stanley Inside Electric Co., Ltd.

Claims (4)

[Claims] 1. A vehicular lamp in which a light room is provided with a breathing opening for outside air, wherein the breathing opening is a main breathing opening in which ventilation resistance when outside air flows into and out of the lamp room is set as appropriate. And a secondary breathing port having a high ventilation resistance with respect to the main breathing port are provided, and the main breathing port is connected to an elastic bag formed in a bag shape with a flexible thin film-shaped member and provided in a lamp chamber. The vehicular lamp is characterized in that the lamp chamber is closed with respect to the outside air, and the auxiliary breathing opening directly communicates the lamp chamber with the outside air. 2. The air supply port is provided at two places with an appropriate distance along the direction of the outside air flowing in and out, and an outside air retention chamber is provided between the two air supply ports. The vehicular lamp according to claim 1, wherein: 3. A ventilation resistance is increased in the auxiliary breathing opening or the flow passage leading to the auxiliary breathing opening when the outside air is sucked into the lamp room, and the ventilation resistance is reduced when the air is exhausted from the lamp room to the outside air. The vehicular lamp according to claim 1 or 2, wherein a thin-film valve is provided so as to be lowered. 4. The main breathing opening and the elastic bag are provided below the light room when the vehicle lighting device is mounted on a vehicle, and the main breathing opening is located at a position where the lowermost end of the lamp room is located. The vehicular lamp according to claim 1, wherein the vehicular lamp is provided in the vicinity and downward.