JP2500083Y2 - Vehicle lighting - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp having a structure in which a synthetic resin lens is fixed to cover a front opening of a synthetic resin lamp housing.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a lamp housing 1 and a lens 2 in a vehicle lamp of this type.

Both the lamp housing 1 and the lens 2 are injection molded from a synthetic resin material. Heat resistance is required for the synthetic resin that forms the lamp housing, and the synthetic resin that forms the lens must be transparent, so after these components are separately constructed using different types of synthetic resin materials, Be combined.

In the lamp housing of this example, the legs 2a are provided around the lens 2 and the seal groove 1a is provided around the lamp housing 1.

Hot melt 3, which is a heat-softening adhesive, is injected into the seal groove 1a, and the leg 2a is inserted and bonded.

[0006]

In the structure of the conventional example shown in FIG. 4, since the seal groove 1a is provided around the opening of the lamp housing 1, the vicinity of the seal groove bulges outward. Not only did the appearance deteriorate, but the shape and weight of the lighting increased. In addition, since the vicinity of the seal groove 1a is bulged toward the interior of the lamp chamber A, there is a problem that it blocks light. Moreover, the sealing performance of the hot melt 3 is not perfect.

In order to improve the above problems, a technique of applying welding instead of adhesion by hot melt is also known, but the above-mentioned problem has not been solved yet.

The present invention has been made in view of the above circumstances. A. Can be configured to be small and lightweight, b. Since it does not bulge outward, there is no risk of impairing the appearance. C. Since it does not bulge inward, there is no risk of blocking the optical path, and d. It is an object of the present invention to provide a vehicular lamp having excellent sealing performance.

[0009]

As a structure for achieving the above object, a vehicular lamp according to the present invention covers a front opening of a synthetic resin lamp housing and a synthetic resin lens is fixed. In the vehicular lamp, a groove is provided at a contact portion between the lamp housing and the lens, and a groove is formed around the outer circumference of the lamp housing. , A synthetic resin material having compatibility with both synthetic resins forming the lens is injected to form a band.

[0010]

According to the above construction, since the band is compatible with both the lens and the lamp housing, they are integrally connected and the bonding strength is large and the sealing property is perfect. Moreover, since it is not necessary to provide the seal groove, the contact portion between the lamp housing and the lens does not bulge outward or inward. Since it does not bulge outward, it does not impair the appearance, and it does not bulge inward so it does not block the optical path. Further, since it is not necessary to provide the seal groove and the lens leg, the entire lamp is compact and lightweight, and the manufacturing cost is reduced.

[0011]

1 is a sectional view of a lens 4 and a lamp housing 5 of a vehicular lamp according to the present invention.
B in the drawing is a contact surface between the lens 4 and the lamp housing 5. The lens 4 is provided with a spigot-shaped stepped portion 4a in which the contact surface B is cut out, while the lamp housing 5 is also provided with a similar stepped portion 5a. Both of the stepped portions 4a and 5a face each other to form a ring groove-shaped recess, and the band 6 is injection-molded to fill the recess.

FIG. 2A is an exploded sectional view of the lens 4 and the lamp housing 5. A spigot-shaped stepped portion 4 a is formed around the lens 4, and a spigot-shaped stepped portion 5 a is also formed around the lamp housing 5. Figure 2
When the lens 4 and the lamp housing 5 are brought into contact with each other as shown in (B), the stepped portions 4a and 5a face each other to form the ring groove 7.

With the lens 4 and the lamp housing 5 in contact with each other as shown in FIG. 2 (B), these members are sandwiched between a mold (instep) 8 and a mold (exhibit B) 9. The groove 7 forms a cavity. A synthetic resin material is injection-molded into this cavity to form the band 6 shown in FIG.

In this example, the lens 4 is made of acrylic resin. The lamp housing 5 is made of polycarbonate. Thus, the band 6 was made of ABS having compatibility with both acrylic resin and polycarbonate.
As a result, the band 6 is integrally welded to both the lens 4 and the lamp housing 5, and firmly and watertightly connects both members.

Moreover, since the band 6 tends to shrink after injection molding, the above-mentioned bond is further strengthened.

As can be easily understood by comparing FIG. 1 (this embodiment) with FIG. 4 (conventional example), this embodiment has the seal groove 1.
Since a is not provided, it does not bulge out of the lamp or toward the inside of the lamp. Therefore, there is no risk of impairing the appearance or blocking the optical path.

Further, since the seal groove 1a and the legs 2a are not provided, the structure is simple, and the size, weight and cost can be reduced.

[0018]

As described above, when the vehicular lamp according to the present invention is applied, a. Can be configured to be small and lightweight, b. Since it does not bulge outward, there is no risk of impairing the appearance. C. Since it does not bulge inward, there is no risk of blocking the optical path, and d. Excellent sealing performance. That is, it has an excellent practical effect.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of the same configuration order.

FIG. 3 is a cross-sectional view for explaining the structure of the band in the above embodiment.

FIG. 4 is a sectional view of a main part of a conventional vehicle lamp.

[Explanation of symbols]

 1 Lamp Housing 1a Seal Groove 2 Lens 2a Leg 3 Hot Melt 4 Lens 4a Stepped Section 5 Lamp Housing 5a Stepped Section 6 Band 7 Ring Groove 8 Mold (A) 9 Mold (B)

Claims (1)

(57) [Scope of utility model registration request] 1. A vehicular lamp in which a synthetic resin lens is fixed to cover a front opening of a synthetic resin lamp housing and is positioned at an abutting portion between the lamp housing and the lens, and an outer circumference thereof is rounded. There is a groove to
A band is formed by injecting a synthetic resin material having compatibility with both the synthetic resin forming the lamp housing and the synthetic resin forming the lens into the groove. A vehicular lamp characterized by.