JPH07147106A - Ventilation structure for lighting apparatus - Google Patents

Abstract

PURPOSE:To provide a ventilation system for vehicle head lights and the like which can secure an excellent dustproofing effect and a high dew preventing effect and maintain proper functions of a lamp. CONSTITUTION:A ventilation hole 6 is formed in a housing 1 in which a bulb is to be stored and the housing is communicated with outside air through the ventilation hole 6 and a ventilation pipe 10 connected in the way it can be detached freely and a filter are installed respectively in a boss part 7 of the housing 1 in which the ventilation hole 6 is formed and in the ventilation pipe 10 wherein the filter has two-layer structure consisting of a first filter 11 and a second filter 15 put respectively in the outdoor side and the housing 1 side. The first filter 11 and the second filter 15 are formed coarsely and densely, respectively and have larger and smaller meshes, respectively. Dust and superfine dust are completely filtered by the first and the second filters and at the same time sufficient ventilating property is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp ventilation system, and more particularly to an in-lamp ventilation structure suitable for headlamps in passenger cars and the like.

[0002]

2. Description of the Related Art In a headlight of a vehicle such as a passenger car, in order to prevent a cloudy phenomenon (hereinafter referred to as "condensation") due to internal humidity, the inside of the lamp is communicated with the outside air to suck and exhaust It is provided with a so-called breathing structure that ventilates the inside of the lamp.

FIG. 6 shows an example of the structure of a conventional headlamp of this type. In the figure, 1 is a housing, 2 is a lens attached to the housing 1, 3 is a bulb which is a light emitting light source, 4 is a reflector for the bulb 3, and 5 is a cap provided on the back side of the housing 1. In the housing 1,
Upper and lower ventilation holes 6 are formed, and the inside of the lamp is communicated with the outside air through these ventilation holes 6.
The lighting and heat generation of the bulb 3 creates an air convection in the lamp, which allows the lower ventilation hole 6 to pass through the housing 1.
The air is sucked into the housing 1, and the air is discharged from the upper vent 6 to the outside of the housing 1.

Here, as shown in FIG. 7, a ventilation pipe 8 is provided in the ventilation hole 6 through a boss portion 7 provided in the housing 1.
Are connected. A filter 9 is mounted in the ventilation pipe 8 to prevent dust and the like from entering the lamp when air is taken in through the ventilation hole 6.

The ventilation pipe 8 is formed of, for example, a rectangular cylinder or a cylinder having an inner diameter of about 6 to 8 mm, and a continuous porous internal filtration layer having relatively large cells, that is, a filter 9 is attached to the ventilation pipe 8. . The structure of the filter 9 is, for example, foamed urethane having a length of 10 to 20 mm, a cell diameter of 0.5 to 2 mm, and a fiber diameter of 200 to 300 μm. According to this lamp ventilation structure, by mounting the filter 9, it is possible to obtain a certain dustproof effect by filtering dust and the like mixed in the air when sucking air from the ventilation hole 6 for preventing dew condensation. .

[0006]

However, in such a ventilation structure in the conventional headlamp, the cells of the filter 9 are made coarse and the fiber diameter is set large in order to secure the air permeability. It has been difficult to effectively filter ultrafine dust (mainly, oil dust of about several μm) and the like contained in the exhaust gas of engine cars.
If such ultra-fine dust penetrates into the lamp and adheres to and is laminated on the inner surface of the lamp, and the amount of lamination increases, the illumination function of the lamp is significantly affected. Further, especially when driving at night and when the road is congested, the inter-vehicle distance becomes narrow, and the lamps are frequently turned on and off. Under such a circumstance, the environment (atmosphere) surrounding the lamp is deteriorated, and the amount of infiltration of soot and dust increases, resulting in accelerated adhesion to the inner surface of the lamp.

On the other hand, in order to enhance the dustproof effect, it is possible to cope with the above-mentioned ultrafine dust by making the cells of the filter 9 finer, for example, by making the cells denser than 20 μm. However, in this case, the ventilation performance of the lamp is deteriorated, and water condensation in the lamp is likely to occur due to heat generated when the lamp is turned on. As a result, not only the illumination function of the lamp is rapidly impaired, but also thermal deformation of the lamp constituent members occurs, and in this case also, the proper illumination function is significantly affected.

In view of the above points, the present invention provides a ventilating structure for a vehicle headlamp of this type, which can secure an excellent dustproof effect and a high dew condensation preventing effect and can maintain the proper function of the lamp. With the goal.

[0009]

In the ventilation structure for a lamp of the present invention, a ventilation hole is provided at an appropriate position of a housing for accommodating a bulb, and the ventilation hole can communicate with the outside air. A ventilation pipe that is detachably connected to a predetermined portion of the housing where the ventilation hole is formed, and a first filter that is mounted inside the ventilation pipe and that is disposed on the outside air side and the housing side, respectively. And a filter having a two-layer structure including a second filter.

In particular, the first filter and the second filter
The filters are formed coarsely and densely, and their meshes are set large and small.

Further, in the ventilation structure of the lamp of the present invention,
A first filter for removing soil particles and a second filter for blocking intrusion of fine carbon particles,
The second filter is formed using a material such as foamed or non-woven fabric, and a predetermined adhesive is attached to the surface thereof.

[0012]

According to the present invention, air convection is formed by lighting and heat generation of the valve, whereby air is sucked into the housing through the ventilation hole. A filter having a two-layer structure is attached to the ventilation pipe connected to the ventilation hole. Of these, a coarse mesh is used as the first filter arranged on the outside air side, which works well for filtering ordinary dust and the like. Further, the second filter arranged on the housing side is configured as an internal filtration layer having a high bulk density using an extremely thin fiber material. As a result, sufficient air permeability is ensured, and the surface area is increased to promote the interception, collision, diffusion, etc., of ultrafine dust, thereby increasing the collection efficiency.

A filter having a two-layer structure is used, and the first filter and the second filter which compose the filter effectively respond to the type of dust or dust and effectively exhibit their respective dustproof functions. As a result, a high dustproof effect can be obtained for the entire filter, and the first filter and the second filter can be used.
In terms of the filter, it is possible to ensure the dustproof effect and the proper air permeability by effectively operating the filter in the right place, and thus the high lighting function of the lamp can be maintained.

Further, in the present invention, in particular, the second filter for preventing the intrusion of fine carbon particles is provided. The second filter is preferably made of foam or the like, and its eyes can be set to be slightly rough to ensure ventilation. Then, in particular, by applying an adhesive to the surface of the eyes of the second filter, the capture rate for fine carbon particles can be increased. As a result, it is possible to effectively cope with airborne particles composed of carbon particles and soil particles.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a ventilation structure for a lamp according to the present invention will be described below with reference to FIGS. 6 and 7 as appropriate.
Shall be referred to.

This embodiment is an example in which the ventilation structure for a lamp according to the present invention is applied to the above-described headlamp of a passenger car or the like. First, in the ventilation structure of the present invention, as shown in FIG. 1, with respect to the boss portion 7 provided in the lamp housing 1,
The ventilation pipe 10 is detachably connected. This ventilation pipe 10
Has a hollow structure, for example, having an L-shaped cylindrical shape as a whole, and a specific attaching / detaching method to / from the housing 1 will be described later. The housing 1 is
The bulb 3, the reflector 4 and the like are housed, and the boss portion 7 is formed with a ventilation hole 6 so that the inside of the lamp is communicated with the outside air through the ventilation hole 6. The configuration is substantially the same as that of the conventional example (see FIG. 6).

2 and 3 show an example of the construction of the essential parts of the ventilation structure of the present invention. In the figure, 11 is a ventilation pipe 1.
A first filter 12 mounted inside 0 and on the outside air side is, for example, a fixing ring for fixing and supporting the first filter 11. A relatively coarse mesh is used as the first filter 11, and is formed of, for example, a nylon material. Specifically, using "nylon 6", 4
2.5 mesh, opening (opening) 400 μm, diameter 10 mm.

The fixing ring 12 has a threaded portion 1 on its outer peripheral portion.
2a and has a screw portion 1 at the end of the ventilation pipe 10 on the outside air side.
It is designed to be screwed onto the No. 3. In addition, the first filter 11
Is fixed to the fixing ring 12 by using an appropriate adhesive or the like as shown in FIG. 3, and thus both are integrally configured. A convex portion 14 for fixing the first filter 11 is formed on the inner peripheral surface of the ventilation pipe 10.

Further, 15 is a second filter mounted in the ventilation pipe 10 and on the housing 1 side. The second filter 15 is formed of an extremely fine fiber material and is configured as an internal filtration layer having a high bulk density. The fiber material for forming the second filter 15 preferably has a diameter of 30 μm or less, and particularly has high heat resistance such as polyester, nylon or glass. The length L (see FIG. 3) of the second filter 15 is preferably about 5 to 50 mm. The length L can be adjusted to be short or long as necessary.

In the above case, the ventilation pipe 10 to which the first filter 11 and the second filter 15 are mounted is usually provided on the suction side, but can also be provided on the exhaust side. Also,
One vent pipe can also serve as an intake port and an exhaust port, and in that case, the gas is exhausted after the intake.

More specifically, in the present embodiment, the second filter 15 was spray-coated with natural rubber latex (100 g / 100 g / m ² ) on a polyester nidle punch non-woven fabric having a fiber diameter of 6 denier (basis weight: 300 g / m ² ).
m ² ), and further after drying it has a diameter of 9 mm and a length of 20 mm
It is formed by cutting into. The natural rubber latex may be natural or synthetic, and other materials such as silicone rubber or polyurethane can be used. The second filter 15 specifically dimensioned as described above is the ventilation pipe 10 having an inner diameter of 8 mm.
It is installed inside. And the attached second filter 15
Is reliably fixed by a fixing convex portion 16 provided on the inner surface of the ventilation pipe 10.

The ventilation pipe 10 is detachable from the housing 1 as described above, but referring to FIG. 1, the outer peripheral surface of the boss portion 7 has an L-shaped engagement as shown in the drawing. A ditch 17 is formed. On the other hand, as shown in FIGS. 2 and 3, the engagement groove 17 is formed on the inner surface of the ventilation pipe 10.
A convex portion 18 that engages with is formed. When connecting the ventilation pipe 10 to the boss portion 7, by engaging the engaging groove 17 and the convex portion 18, the ventilation pipe 10 is securely connected and fixed to the boss portion 7, and thus the housing 1.

According to the ventilation structure of the lamp according to the present embodiment,
Air convection is formed in the housing 1 due to the lighting and heat generation of the valve 3, whereby the housing 1 is passed through the ventilation hole 6.
Air is inhaled inside. At the time of this air intake, the intake air first passes through the first filter 11 attached to the ventilation pipe 10, and the first filter 11 is composed of a coarse mesh, whereby normal dust is It works well for filtering etc. As described above, in the ventilation structure of the present invention, the first-stage filter action of the first filter 11 mainly exerts a filtering function for relatively large dust or the like, and such dust or the like can be removed in advance. .

The intake air that has passed through the first filter 11 is
Then, it passes through the second filter 15. Second filter 15
As mentioned above, in order to improve the collection efficiency of ultrafine dust, by spraying, it is impregnated with an elastomer adhesive that easily adsorbs oil dust, etc., and applied to the extremely thin fiber material surface and contact surface. It is dried. Although it is configured as an internal filtration layer having a high bulk density, it has sufficient air permeability and also has a large surface area to promote the blocking, collision, and diffusion of ultrafine dust, thereby improving its collection efficiency. Can be increased. In this way, the second-stage filter action of the second filter 15 mainly exerts a filtering function for ultrafine dust.

As described above, the size of the mesh and the degree of coarseness / denseness of the first filter 11 and the second filter 15 are appropriately set according to the type of dust or ultrafine dust to be applied. By using a two-layer filter,
A dustproof function is effectively and appropriately exhibited against dust and ultrafine dust, and as a result, a high dustproof effect can be obtained for the entire filter. As a result, it is possible to completely prevent the ingress of dust and the like into the housing 1, and also secure good ventilation with such a dust-proof effect, thereby achieving both a high dust-proof effect and a dew condensation prevention effect. It is possible to ensure the high lighting function of the lamp.

Here, FIGS. 4 and 5 show modified examples of the connecting structure of the ventilation pipe 10 in the ventilation structure of the present invention. In this case, the screw portion 19 is formed on the outer peripheral surface of the boss portion 7, and the screw portion 19 is formed on the inner peripheral surface of the end portion of the ventilation pipe 10.
A threaded portion 20 that is screwed with
The ventilation pipe 10 is screwed to the housing 1 by 20. The rest of the configuration is basically the same as that of the above embodiment. In this way, connect the ventilation pipe 10 to the screw part 1
It can be detachably connected to the housing 1 through the screwing of 9 and 20, and in this case, the same effect as that of the above embodiment can be obtained.

By the way, the airborne particles are characterized by their constituent substances and particle shape depending on the height from the ground and the paving condition on the ground surface. In the areas where automobiles are used, although there are differences depending on the location, suspended particles found in any area are carbon particles such as diesel exhaust gas and soil particles. These primary particles are fine, but when they are present in the atmosphere, they form secondary aggregates. The average particle size of this secondary aggregate is 0.
2 to 0.8 μm, and 3 to 8 μm for soil particles
Is. There are suspended particles other than these two types, but the amount is extremely small. In other words, for this type of automobile filter, diesel soot of about 0.5 μm and 5 μm
The main target is soil particles of about m.

Therefore, according to a further aspect of the present invention, it is possible to obtain a ventilation structure of a lamp capable of exhibiting an excellent filter action against such air suspended particles. According to this ventilation structure of the lamp, the first-stage filter (first filter) for removing soil particles of about 5 μm and the second-stage filter (second filter for preventing intrusion of fine carbon particles) Filter) and. The eyes of the first filter are coarsely set. Further, in the second filter, fine meshes are required for the carbon particles, but if the meshes are too fine, it will affect the air permeability, so it is formed using a material such as foam or nonwoven fabric. The structure is such that an appropriate turbulent air flow is generated inside the filter, and the mixed particles easily collide with the foam or the like.

In particular, the eyes of the foam of the second filter are set to be slightly rough to ensure air permeability, while a treatment for increasing the filter capture rate is performed to achieve a desired filter effect. That is, by attaching an adhesive (adhesive substance) to the surface of the eyes of the second filter, the capture rate for fine carbon particles can be increased. The pressure-sensitive adhesive may be any as long as it can capture fine carbon particles, and examples thereof include rubbers such as natural rubber, styrene-butadiene rubber or nitrile rubber, acrylic resins mainly containing butyl acrylate, and ethylene- A resin such as vinyl acetate resin is selected. Further, even a resin such as a vinyl chloride resin or a vinyl butyral resin which is not adhesive at room temperature can be used as an adhesive by mixing a plasticizer such as dibutyl phthalate.

To attach such an adhesive to a filter, an emulsion type one in which fine particles are dispersed in water, a benzene type solvent such as toluene, a ketone type solvent such as methyl ethyl ketone, or an ester type solvent such as ethyl acetate is used. Apply as a solution type dissolved in a solvent. As a coating method, for example, a usual spray method or a dipping method can be used.

It is also possible to use, as a special adhesive, a resin obtained by copolymerizing butyl acrylate with a monomer having an unsaturated acid or a hydroxyl group, and crosslinking the resin by reacting an isocyanate. That is, both can be dissolved in a solvent such as methyl ethyl ketone, rapidly applied to a filter, and hot air is blown against this to vaporize the solvent and to obtain cross-linking. The pressure-sensitive adhesive having this cross-linking bond has the advantage that it does not fall off from the filter even when exposed to high temperatures.

It should be noted that the numerical values and the like exemplified in the above embodiment can be appropriately changed as necessary, and the present invention is not limited to these numerical values. Further, the ventilation structure of the present invention can be applied to various lamps other than the case of a headlamp of an automobile or the like, and the same effect as that of the above embodiment can be obtained.

[0033]

As described above, according to the present invention, in this type of headlamp, a high dustproof effect and a high condensation preventing effect can be simultaneously and effectively realized, and the function of the lamp can be properly maintained. . Further, there are advantages that the durability of the lamp can be improved, a proper lighting function can be secured for a long period of time, and safety in a vehicle or the like can be secured. Further, it exerts an excellent filter action also on both carbon particles and soil particles constituting airborne particles, and can effectively cope with them.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts in an embodiment of a ventilation structure for a lamp of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the ventilation structure of the lamp of the present invention.

FIG. 3 is an exploded cross-sectional view of a main part of a ventilation structure for a lamp of the present invention.

FIG. 4 is an exploded cross-sectional view of a main part in a modified example of the ventilation structure of the lamp of the present invention.

FIG. 5 is an exploded perspective view of essential parts in a modified example of the ventilation structure of the lamp of the present invention.

FIG. 6 is a vertical cross-sectional view showing a configuration example of a conventional headlamp.

FIG. 7 is a vertical sectional view showing an example of a filter structure in a conventional headlamp.

[Explanation of symbols]

 1 Housing 2 Lens 3 Valve 4 Reflector 6 Vent hole 7 Boss part 10 Vent pipe 11 First filter 12 Fixing ring 15 Second filter 17 Engagement groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Tamotsu Tanaka, Nobanchi, Tauraminato-cho, Yokosuka, Kanagawa Kanto Automobile Industry Co., Ltd. (72) Inventor, Hirotoshi, Nobunchi, Tauraminatomachi, Yokosuka, Kanagawa Kanto Automobile Industry (72) Inventor Hiroyuki Suzuki No address in Taura Port Town, Yokosuka City, Kanagawa Kanto Automobile Industry Co., Ltd. (72) Inventor Tsutomu Sugito 1 Toyota Town, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Inventor Araga Year 1 1st 41st Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture Toyota Central Research Institute Co., Ltd. (72) Inventor Masaaki Tada 1st 41st Nagakute, Nagakute-cho, Aichi-gun, Aichi 1 Toyota Central Research Co., Ltd. In-house (72) Inventor, Tomoto Ishiguro, No. 41, Yokomichi, Nagakute-cho, Aichi-gun, Aichi-gun Central within the Institute

Claims (3)

[Claims] 1. A ventilation structure for a lamp in which a housing for accommodating a bulb is provided with a vent hole so that the vent hole can communicate with the outside air, and the vent hole is formed at a predetermined portion of the housing. A detachably connected ventilation pipe, and a first filter and a second filter which are mounted in the ventilation pipe and are respectively arranged on the outside air side and the housing side.
A ventilation structure for a lamp, comprising: a filter having a two-layer structure including a filter. 2. The first filter and the second filter are formed coarsely and densely, and each mesh has a large mesh.
The ventilation structure for a lamp according to claim 1, wherein the ventilation structure is set to be small. 3. A first filter for removing soil particles and a second filter for preventing intrusion of fine carbon particles, the second filter being formed by using a material such as foam or non-woven fabric. The ventilation structure for a lamp according to claim 1, wherein a predetermined adhesive is attached to the surface of the lamp.