JP2913966B2 - Vehicle lighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is a vehicle that can lamp chamber by the lens and housing relates to a vehicular lamp that is defined, in particular it has a simple structure, to prevent fogging of the lamp chamber inner surface of the lens The present invention relates to lighting fixtures .

[0002]

2. Description of the Related Art A vehicular lamp in which a room is defined by a lens and a housing is used for lighting, signals, signs, and the like equipped with a light source bulb such as a head lamp, a side lamp, a rear combination lamp, and a turn signal lamp. be one which, moreover, there is the also the semi-sealed structure type that has been communicated by the indoor and outside breathing structure.

Hereinafter, a conventional vehicle lamp will be described with reference to FIGS. 3 and 4. FIG. In this example , an example in which the invention is used for a semi- closed structure type headlamp will be described. In the figure, reference numeral 1 denotes a housing made of, for example, a synthetic resin. The housing 1 has a front surface 10 and a rear portion 11. At the upper part of the rear part of the housing 1, on both left and right sides, a breathing tube 12 is integrally protruded rearward, and a breathing hole 13 for communicating the inside of a light room 20 and the outside described later is formed in the breathing tube 12. In addition to the provision of the stepped portion 1 on the outer peripheral surface of the intermediate portion of the
4 is provided.

[0004] Reference numeral 2 denotes a lens. The lens 2 has a shape with an opening at the rear. The rear opening of the lens 2 is attached to the front opening 10 of the housing 1 by, for example, hot-melt adhesive bonding and sealing. As a result, a lamp room 20 defined by the housing 1 and the lens 2 is formed.

[0005] Reference numeral 3 denotes a movable reflector. The movable reflector 3 has an opening at a front portion, and a reflection surface 30 of, for example, a paraboloid of revolution is provided on the front side (inner side) thereof by, for example, aluminum evaporation. The movable reflector 3 is provided with a through hole 31 at a rear portion, and a light source bulb fixture (not shown) is provided at a periphery of the through hole 31. The movable reflector 3 is rotatably mounted on the housing 1 by a pivot bearing mechanism (not shown). As a result, the movable reflector 3 is rotatably stored in the lamp chamber 20.

Reference numeral 4 denotes a light source bulb, for example, an H4 type bulb. The light source bulb 4 includes a glass bulb 40, a main filament and a subfilament (not shown) disposed in the glass bulb 40, and a light shield (not shown) disposed below the subfilament. A light-shielding film (not shown) provided at the front end of the glass bulb 40, a base 41 provided integrally from the rear of the glass bulb 40, and a flange integrally provided at an intermediate portion of the base 41 42 and the base 4
1 from the rear. The light source bulb 4 is inserted from the rear through-hole 31 of the movable reflector 3 to the front reflecting surface 30 side of the movable reflector 3, and the flange 42 of the light source bulb 4 is brought into contact with the periphery of the through-hole 31 of the movable reflector 3. The light source bulb 4 is detachably attached to the movable reflector 3 by the fixture of the movable reflector 3. As a result, the light source bulb 4 is disposed on the front side of the movable reflector 3, and the main filament and the subfilament of the light source bulb 4 are positioned parallel to the rotation center axis (optical axis) of the reflection surface 30 of the movable reflector 3. The main filament is located near the focal point F of the reflection surface 30 of the movable reflector 3. Reference numeral 44 denotes a rubber cap which is in close contact with the base 41 of the light source bulb 4, and reference numeral 45 denotes a mounting cap which makes the peripheral portion of the rubber cap 44 adhere to the rear opening 11 of the housing 1.

Reference numeral 5 denotes a rubber grommet for performing a respiratory action between the inside of the lamp chamber 20 and the outside air and a water intrusion preventing action, and has a tubular U-shape. One end (upper end) opening 51 of the grommet 5 is externally fitted to the tip of the respiratory cylinder 12, and one end face of the grommet 5 is brought into contact with the step portion 14 of the respiratory cylinder 12,
The other end (lower end) opening (not shown) of the grommet 5 faces downward, and the other end opening of the grommet 5 faces the rear wall of the housing 1.

Thus, when the light source bulb 4 is turned on, light from the light source bulb 4 is reflected on the reflection surface 30 of the reflector 3, and the reflected light is transmitted through the lens 2,
The light is radiated to the outside in a predetermined light distribution pattern. Further, in such a headlamp, the interior of the lamp chamber 20 and the exterior are formed by the breathing hole 13 of the housing 1 and the grommet 5 (breathing structure).
To communicate through. As a result, a respiratory action is performed between the inside of the lamp chamber 20 and the outside, and a pressure change in the lamp chamber 20 can be eliminated. Further, since the grommet 5 is bent in a U-shape, and one end opening 51 is externally fitted to the respiratory cylinder 12 and the other end opening is mounted downward, water enters the lower end opening of the grommet 5, and the water is discharged. Even if an attempt is made to pass through the interior of the grommet 5, the water will fall under its own weight in the course of the curved grommet 5, and will be discharged to the outside through the lower end opening of the grommet 5 to prevent the reverse intrusion of water. Can be.

[0009]

However, in the above-described conventional headlamp, the interior and the exterior of the lamp chamber 20 communicate with each other through the breathing hole 13 and the grommet 5 of the housing 1. When a respiratory action is performed between the inside and the outside, moisture enters the lamp room 20. For this reason, due to the difference between the temperature in the lamp room 20 and the outside air temperature, etc.
Clouds 6 (shown by oblique lines in FIG. 3 and by dots in FIG. 4) are generated on the inner surface of the lens 2. When the fogging 6 occurs on the inner surface of the lens 2, for example, in the case of the above-described vehicle lamp, problems such as a failure to obtain predetermined light distribution characteristics, a decrease in light distribution luminous intensity, and a deterioration in appearance are caused. In addition,
Oite <br/> the vehicular lamp of the semi-closed structure type other than the above-described headlamp likewise lamp chamber inner surface of the lens from fogging.

[0010] Therefore, a technique for preventing fogging of the inner surface of the vehicle lamp of the lens including the above-described headlamp filed previously. For example, such a technology includes
There is 2-176901. However, the above-described technology and the like form an air flow passage between the lamp body and a reflecting mirror installed inside the lamp body, and provide an anti-fog member (for example, The outer surface of the reflector or the inner surface of the lamp body, or both surfaces are made of a rough surface with fine irregularities by honing, etc., or for example, a separate aluminum material in the form of a strip with a honeycomb structure, etc. Is kept in the air flow passage). However, there is a problem that the structure is complicated.

An object of the present invention is to provide a vehicular lamp having a simple structure and capable of preventing fogging on the indoor side surface of a lens.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to the above-mentioned object.
In order to achieve this, a vehicle lamp with a breathing structure
To provide a semiconductor function as a water-solubilizing salt containing a -0H group.
Antifogging paint made of acrylic resin
And the lamp chamber inner surface of the lens, characterized in that the coating cloth.

[0013]

SUMMARY OF vehicular lamp of the present invention, the antifogging coating coated on the lamp chamber inner surface of the lens, because it absorbs moisture in the lamp chamber, reliably prevent fogging of the lamp chamber inner surface of the lens can do. Moreover, since only the lens antifogging effect of applying the antifogging coating the lamp chamber inner surface of the lens is obtained, as in the prior art, or subjected to machining or the like to the component itself, or using another component Aruwa There is no need to do so, so the structure is simple.
In particular, the vehicular lamp of the present invention has a semiconductor protection function.
Because of the use of fogging paint, static electricity on the inner surface of the lens
Can be prevented from being charged. As a result, the respiratory structure
Even if dust enters the lamp room due to respiration,
Prevents dust from adhering to the lens inner surface
You.

[0014]

FIG. 1 shows an embodiment of a vehicular lamp according to the present invention.
This will be described with reference to FIG. In this example , an example in which the invention is used for a semi- closed structure type headlamp will be described. In the drawing, the same reference numerals as those in FIGS. 3 and 4 denote the same components. In the figure,
Reference numeral 60 denotes an antifogging paint. This antifogging paint 60 is applied to the entire surface (inner surface) of the lens 2 on the lamp room 20 side as shown in FIG. In FIG. 1, hatching is omitted in the drawing, and the antifogging paint 60 is hatched. Further, in the drawing, the thickness is shown thicker than the actual thickness (5 to 20 μm) of the anti-fogging paint 60.

The antifogging paint 60 described above includes:
For example, while making a resin molecule contain a large amount of -0H groups,
Durability, anti-fogging, semi-conducting machine using water-soluble salt as resin
Acrylic resin with function (Applicant: Showa Shell Sekiyu Sekiyu)
Co., Ltd., Agent: Eiji Tomomatsu, Type: Patent, Reference number:
HP800008-1, which is related to this FD application)
Use cloudy paint. The antifogging paint 60 has a water absorption
Is larger than conventional antifogging paints,
The effect of preventing fogging on the inner surface of the lens 2 is great. In addition, such prevention
Since the fogging paint 60 has semiconductor properties, the lens 2
Can be prevented from being charged on the inner surface of the device.

In this embodiment, a vehicle according to the present invention is used.Lamp
Is configured as described above, so that the housing 1
Hole 13 and grommet 5(Breathing structure)Through the lighthouse
When a respiratory action is performed between the inside and the outside,
Even if moisture enters the light room 20, the light room 20
The moisture that has invaded the water is absorbed by the antifogging paint 60,
Fogging of the indoor side surface of the lens 2 can be reliably prevented.
You. In addition, the antifogging paint 60 is applied to the indoor surface of the lens 2.
The anti-fog effect of the lens 2 can be obtained only by applying over the entire surface.
The parts themselves were processed, etc.
And there is no need to use separate parts,
Is easy.

Particularly, in this embodiment, the vehicle according to the present invention is used.
The lamp uses an antifogging paint 60 having a semiconductor function.
Therefore, the electrostatic charge on the inner surface of the lens 2 is prevented.
Can be As a result, the breathing structure (of housing 1)
Dust due to the breathing action of the breathing hole 13 and the grommet 5).
(Not shown) enters the interior of the lamp chamber 20
It is possible to prevent dust from adhering to the inner surface of the lens 2,
Dirt on the inner surface of the lens 2 can be prevented.

In the above-mentioned embodiment, the headlamp having a semi- closed structure has been described. However, the headlamp can be used for other vehicle lamps . Further , in the above-described embodiment, the anti-fog coating is applied to the entire inner surface of the lens 2 (particularly, a portion engraved with a prism or the like and involved in illumination or light distribution). Of the inner surface of 2,
In particular, an antifogging paint may be partially applied to an easily fogged portion. Further, the above-described anti-fogging paint 60 generally absorbs water when exhibiting an anti-fogging effect, and releases water when the interior of the lamp room 20 is dried. Since the size of the particles is very small as compared with the size of the water particles at the time of absorption, moisture can be efficiently discharged to the outside. Furthermore, the above-described anti-fog coating material 60 can protect the surface of the material to be applied and can also provide the surface of the material to be coated with smoothness, similarly to the top coat paint. For this reason, when the above-mentioned lens 2 is a resin lens, by applying the anti-fogging paint 60, the smoothness of the inner surface of the lens 2 is improved, the light transmittance is improved, and the lens 2 becomes bright. On the other hand, when the lens 2 is glass, it is not necessary to mirror-process the surface of the lens molding die, and even if the lens 2 is molded using the rough molding die, the inner surface of the lens 2 is prevented. By applying the fogging paint, a predetermined light transmittance can be obtained.

[0019]

As apparent from the above, according to the present invention, the vehicular lamp of the present invention, since the lamp chamber inner surface of the lens is obtained by an antifogging coating material is applied, by its antifogging coating, the lamp chamber since absorb moisture, a haze of lamp chamber inner surface of the lens can be reliably prevented. Moreover, since only the lens antifogging effect of applying the antifogging coating the lamp chamber inner surface of the lens is obtained, as in the prior art, or subjected to machining or the like to the component itself, or using another component Aruwa There is no need to do so, so the structure is simple.

In particular, the vehicular lamp of the present invention is a semiconductor device.
Uses an anti-fog coating that has the ability to
Electrostatic charge can be prevented. This result
As a result, dust entered the lighting room due to the respiratory action of the breathing structure
To prevent the dust from adhering to the inner surface of the lens.
Can be

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vehicular lamp according to the present invention, which is used in a semi-closed structure type headlamp .

FIG. 2 is a rear perspective view of a lens used for the head lamp in FIG. 1;

Figure 3 shows a conventional vehicle lamp, a front view of an example of using the semi-closed structure type headlamp.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3 ;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 13 ... Breathing hole, 2 ... Lens, 20 ... Light room, 3 ... Reflector, 4 ... Light source bulb, 5 ... Grommet, 60 ... Antifogging paint.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F21M 7/00 F21M 3/02

Claims (1)

(57) [Claims] 1. A lamp room is defined by a lens and a housing.
And the respiratory action between the light room and the outside
And a breathing structure for performing the
In the vehicular lamp in which the anti-fog coating was applied to the side surface, the anti-fog coating was a water-soluble salt containing -0H group.
It is composed of acrylic resin with semiconductor function
That, in the vehicle lamp, characterized in that.