JP3873436B2 - Vehicle lighting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield beam type vehicular lamp in which a lens covering an opening of a reflector is bonded to the reflector.
[0002]
[Prior art]
Conventionally, as a shielded beam type vehicular lamp, a lens is adhered along the periphery of the reflector opening, whereby the reflector opening is closed to the lens, and a light source is provided in the lamp chamber formed by the reflector and the lens. What is provided is known.
[0003]
In this type of vehicular lamp, light from a light source is reflected by a reflector, passes through an opening and a lens, and irradiates the outside of the lamp chamber.
[0004]
[Problems to be solved by the invention]
By the way, in this conventional vehicular lamp, since the lamp becomes hot as the light source emits light, a silicon-based one having high heat resistance is used as an adhesive for bonding the reflector and the lens.
[0005]
However, when the adhesive is solidified, a gas is generated at a high temperature, and components of the gas may adhere to the lamp chamber, resulting in a decrease in the amount of irradiated light and a deterioration in the appearance of the lamp chamber. .
[0006]
In addition, the generation of the gas becomes more conspicuous as the temperature becomes higher, and in order to suppress the amount of gas generated, it is necessary to suppress the temperature rise of the bonded portion, but in general, the smaller the lamp is, the smaller the bonded portion is. Since it becomes high temperature, there also exists a problem that size reduction of a lamp is difficult.
[0007]
The present invention has been made in view of the above circumstances, and can prevent a reduction in the amount of irradiation light due to the gas generated from the bonded portion and deterioration of the appearance in the lamp chamber, and can be miniaturized. It is an object to provide a type of vehicle lamp.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention described in claim 1, a lamp chamber is formed by a reflector having an opening and a lens that closes the opening, and a light source is provided in the lamp chamber. A shield beam type vehicular lamp that is bonded to the reflector along a periphery of an opening, wherein the lamp chamber of gas generated from the bonded portion is formed inside the bonded portion formed along the periphery. It is characterized in that a seal member is provided to prevent the inflow into the tube.
[0009]
According to a second aspect of the present invention, in the vehicular lamp according to the first aspect, the lens is formed with a concave portion in which the seal member is disposed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a vehicular lamp according to the present invention is applied to a shielded beam type fog lamp and will be described with reference to the drawings.
[0011]
FIG. 1 shows a fog lamp as a vehicular lamp. As shown in FIG. 2, the fog lamp 1 includes a bulb 2 as a light source, a reflector 3 holding the bulb 2, and an opening 3a of the reflector 3 to form a lamp chamber 4 together with the reflector 3. 5, a shade 6 provided in front of the bulb 2, and a housing 7 that covers the leg 5 a of the lens 5 to the rear of the reflector 3. The rear part of the housing 7 is detachably fixed to the bracket 8. A structure for attaching the lens 5 to the reflector 3 will be described later.
[0012]
At the rear of the reflector 3 is a cylindrical valve holder that holds the bulb 2 with the optical axis P1 of the bulb 2 slightly inclined (eg, 3 °) with respect to an axis P2 orthogonal to the edge of the opening 3a. 3b is formed to protrude rearward.
[0013]
On the outer wall surface near the rear part of the valve holding portion 3b, a water droplet blocking portion 3c is integrally projected on the entire circumference so that water droplets entering from the housing 7 are not transmitted to the socket 2a of the valve 2. ing.
[0014]
The shade 6 extends along the vertical direction (the direction perpendicular to the paper surface in FIGS. 1 and 2), and the upper and lower ends thereof are sandwiched between the reflector 3 and the lens 5. On the surface of the shade 6 facing the lens 5, a reflective coating similar to the reflective coating deposited on the reflective surfaces 3d and 3d of the reflector 3 is deposited. The surface portions 6a and 6a of the shade 6 are formed in a symmetrical umbrella shape that is warped outward along the reflecting surfaces 3d and 3d of the reflector 3 and expanded rearward. The light beam directly directed to the lens 5 is blocked, and the appearance in the lamp chamber 4 is improved.
[0015]
The housing 7 includes a front housing 9 and a rear housing 10. The front and rear housings 9, 10 are combined by a pair of left and right screws 11, 11, and the lens 5 is attached to the inner peripheral surface of the front housing 9 in this combined state. The leg 5 a is press-fitted and the reflector 3 and the lens 5 are held in the housing 7.
[0016]
Grommets 13 that hold wiring cords 12, 12 that supply power to the valve 2 are fitted to the rear housing 10. .. Are formed on the outer wall surface of the rear housing 10 so that water drops are not guided to the grommet 13 through the outer wall surface.
[0017]
FIG. 3 shows an enlarged view of the attachment structure of the lens 5 to the reflector 3. In FIG. 3, 3e is an end surface of the reflector 3, 3f is an engaging recess, 5b is an end surface of the leg 5a of the lens 5, 5c is an engaging projection, 5d is an annular groove as a recess, and 15 is a seal member. is there.
[0018]
The end surface 3e is formed along the entire periphery along the periphery of the opening 3a of the reflector 3. An engaging recess 3f is formed outside the end surface 3e. On the other hand, the end surface 5b is formed over the entire circumference of the lens 5, and an engaging convex portion 5c is formed outside the end surface 5b so as to engage with the engaging concave portion 3f. The annular groove 5d is formed over the entire circumference of the lens 5 inside the engaging convex portion 5c.
[0019]
The seal member 15 is formed in an annular shape along the annular groove 5d, and is disposed in the annular groove 5d. The seal member 15 is made of an elastic body that does not generate gas at a high temperature (for example, about 200 ° C.), and more preferably, the seal member 15 can adsorb a gas generated from an adhesive portion described later. The seal member 15 has a square shape in cross section so as to come into contact with the annular groove 5d and the end surface 3e in a planar shape.
[0020]
When the lens 5 is attached to the reflector 3, after the adhesive is applied to the engagement recess 3f of the reflector 3, the engagement protrusion 5c of the lens 5 is engaged with the engagement recess 3f, and The lens 5 is pressed toward the reflector 3 so that the seal member 15 is pressed and sandwiched between the lens 5 and the reflector 3 so that the lamp chamber 4 becomes airtight.
[0021]
As the adhesive applied to the engaging recess 3f, a commonly used one, for example, a material having high heat resistance such as a silicon-based adhesive is used. When the adhesive is solidified, an adhesive portion 16 is formed between the engaging concave portion 3f and the engaging convex portion 5c. The bonding portion 16 bonds the lens 5 to the reflector 3 and also serves as a packing that prevents water from entering between the joints.
[0022]
In the fog lamp 1 according to this embodiment, since the lamp chamber 4 and the adhesive portion 16 are hermetically shut off by the seal member 15, the adhesive portion 16 becomes hot as the bulb 2 emits light. Even if this occurs, the generated gas is prevented from entering the lamp chamber 4. For this reason, a gas component does not adhere to the inside of the lamp chamber 4, and a decrease in the amount of illumination light and a deterioration in the appearance of the interior of the lamp chamber 4 can be prevented.
[0023]
Further, since the adverse effect due to the generation of gas does not reach the inside of the lamp chamber 4, the fog lamp can be obtained without concern for the amount of the generated gas, that is, without considering the temperature rise of the bonding portion 16 as much as in the past. The size of 1 can be set, and the lamp can be miniaturized.
[0024]
Since the lens 5 is formed with an annular groove 5d in which the seal member 15 is disposed, the seal member 15 can be easily positioned and the assembling property of the fog lamp 1 is good. As described above, since the adhesive is applied to the reflector 3 when the lens 5 is attached to the reflector 3, the adhesive can be obtained by attaching the seal member 15 to the annular groove 5d on the lens 5 side in advance. Adhesive adhesion to the seal member 15 during application can be prevented. Prevention of adhesion of the adhesive to the seal member 15 is particularly beneficial when the seal member 15 has a property of adsorbing the generated gas.
[0025]
Here, the lens 5 is attached to the reflector 3 with the lens 5 positioned upward as shown in FIG. 3. If the concave portion is provided on the reflector 3 side, the concave portion is provided. There is a risk that excessive adhesive will flow into and adhere to the seal member 15. In the fog lamp 1, since the annular groove 5d as the concave portion is provided on the lens 5 side, such a fear is small, and adhesion of the adhesive to the seal member 15 is effectively suppressed.
[0026]
The seal member 15 used here is an elastic body, and is pressed against the annular groove 5d of the lens 5 and the end surface 3e of the reflector 3, so that the lamp chamber 4 and the adhesive portion 16 are more securely and airtight. Cut off. That is, for example, even if there is a slight surface property problem on the contact surface 15a of the seal member 15 or the end surface 3e of the reflector 3, there is no gap between the contact surface 15a and the end surface 3e. Can still block the flow of the generated gas into the lamp chamber 4.
[0027]
【The invention's effect】
Since the vehicular lamp according to the present invention is configured as described above, it is possible to prevent a decrease in the amount of irradiation light due to the gas generated from the bonding portion and a deterioration in the appearance of the lamp chamber, and it is possible to reduce the size. There is an effect that there is.
[Brief description of the drawings]
FIG. 1 is a plan view showing a vehicular lamp according to the present invention.
2 is a horizontal sectional view of the vehicular lamp in FIG. 1. FIG.
FIG. 3 is an enlarged horizontal sectional view showing a mounting structure between the lens and the reflector of FIG. 2;
[Explanation of symbols]
1 Fog lamp (vehicle lamp)
2 Bulb (light source)
3 Reflector 3a Opening 4 Lamp chamber 5 Lens 15 Sealing member 16 Adhesive part

Claims (2)

A lamp chamber is formed by a reflector having an opening and a lens that closes the opening, and a light source is provided in the lamp chamber, and the lens is bonded to the reflector along a peripheral edge of the opening. Vehicle lighting equipment,
A vehicular lamp characterized in that a seal member for preventing gas generated from the adhering portion from flowing into the lamp chamber is provided inside the adhering portion formed along the peripheral edge. The vehicular lamp according to claim 1, wherein a concave portion in which the seal member is disposed is formed in the lens.

Images