JP2500084Y2 - 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. Excellent sealing performance, e. An object of the present invention is to provide a vehicular lamp in which a lamp housing and a lens are firmly coupled.

[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 ring groove is provided which is located at the contact portion between the lamp housing and the lens and makes a round around the outer periphery thereof, and a recess is provided adjacent to the ring groove. A communication path between the ring groove and the recess is provided, and is compatible with both the synthetic resin forming the lamp housing and the synthetic resin forming the lens in the groove. A synthetic resin material is injected to form a band.

[0010]

According to the above construction, the band fills the concave portion both on the lens and the lamp housing to form an anchor-shaped portion, so that they are integrally joined, and the joining strength is large and the sealing property is perfect. is there. 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 can be made compact and lightweight, and the manufacturing cost can be reduced.

[0012]

FIG. 2 is a sectional view showing a lens 4 and a lamp housing 5 of a vehicular lamp according to the present invention in an extracted manner.
(A) shows a state in which both members are separated from each other, and (B) shows a state in which they are in contact with each other.

Reference numeral a in the figure denotes a contact surface between the lens 4 and the lamp housing 5. The lens 4 has the contact surface B described above.
A stepped portion 4a having a notched shape is formed, and a similar stepped portion 5a is also formed on the lamp housing 5. Both of the stepped portions 4a and 5a face each other to form a ring groove-shaped recess 7, and the band 6 is injection-molded as shown in FIG. 1A by filling the recess.

FIG. 1 (B) is an explanatory view of the shape of the portion b shown in FIG. 1 (A), and FIG. 1 (C) is a view from the arrow c.
Reference numeral 7 is a ring groove provided so as to straddle the contact surface a. Short groove-shaped recesses 11 are provided adjacent to both sides of the ring groove 7. A communication passage 12 is provided between the ring groove 7 and the recess 11.

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 metal mold (instep) 8 and a metal mold (second) 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. The band 6 is made of ABS. As a result, the band 6 fills the concave portion with respect to both the lens 4 and the lamp housing 5 and integrally adheres in an anchor shape to firmly and watertightly connect 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, so that the structure can be made small, lightweight and inexpensive.

When the present invention is implemented, a strong bond can be obtained even if there is no compatibility between the synthetic resins constituting the lens, the lamp housing, and the band, and a perfect sealing property can be obtained.

FIG. 5 shows an embodiment different from the above. Figure 5
FIG. 5A is a sectional view corresponding to FIG. 1B in the above embodiment, and FIG. 5B is a plan view corresponding to FIG. 1C. 5'is a lamp housing and 4'is a lens. Reference numeral 7'denotes a ring groove corresponding to the ring groove 7 in the above embodiment.

Adjacent to the ring groove 7 ', round hole-shaped recesses 13 are formed on both sides thereof. A communication passage 14 is provided between the round hole-shaped recess 13 and the ring groove 7 '.

When the synthetic resin is injected and solidified in the groove as shown in FIG. 1B, or when the synthetic resin is injected and solidified in the groove as shown in FIG. The synthetic resin band thus formed fills the recesses 11 and 13 to form an anchor shape, and firmly bonds the lens and the lamp housing.

[0024]

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, e. It has an excellent practical effect that the lens and the lamp housing are firmly coupled.

[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.

FIG. 5 is an explanatory view of an embodiment different from the above.

[Explanation of symbols]

 1 Lamp housing 1a Seal groove 2 Lens 2a Leg 3 Hot melt 4,4 'Lens 4a Stepped part 5,5' Lamp housing 5a Stepped part 6 Band 7,7 'Ring groove 8 Mold (instep) 9 Mold ( B) 11 Groove-shaped recess 12 Communication passage 13 Round hole-shaped recess 14 Communication passage

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
Moreover, a recess is provided adjacent to the ring groove, and a communication path between the ring groove and the recess is provided, and a synthetic resin material is injected into the groove to form a band. A vehicle lighting device characterized by being