JP2517595Y2 - Lens mounting structure for 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 lens mounting structure for a vehicular lamp, in which a lens leg is inserted into a seal groove of a lamp housing and fixed with an adhesive sealant.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a conventional example of a vehicular lamp in which a headlight A and a front turn signal lamp B are integrally formed. The front lens 2 is fixedly mounted so as to cover the front opening of the lamp housing 1. 3a is a reflector of headlight A, 3b is a turn signal lamp B
Is the reflector of. 4a is a light source bulb of the headlight A, 4
Reference numeral b is a light source bulb of the turn signal lamp B. Around the front opening of the lamp housing 1, seal grooves 5a, 5
b is formed and the legs 6 are formed around the front lens 2.
a and 6b are formed.

Hot melt, which is a thermosoftening adhesive, is injected into the seal grooves 5a, 5b, and the legs 6a, 6b are inserted to seal and adhere.

A chain line arrow S shown in the figure is a reference axis that points to the front of the vehicle, and is also an optical axis that is the main projection direction of the headlight A. The front lens 2 of this type of vehicle lamp is generally
It has a wrap-around portion 2a that is curved to the side of the vehicle. Since the wraparound portion 2a is formed, the leg 6a and the leg 6b of the lens 2 have different protruding directions from the lens main body portion.

[0005]

The front lens 2 in the vehicular lamp of the type described with reference to FIG. 4 is generally injection-molded from a synthetic resin material, and the direction of opening the mold is indicated by the arrow a.
Is parallel to the vehicle reference axis (optical axis S). However, since the part where the front lens 2 forms a part of the turn signal lamp B wraps around the side of the vehicle body as shown in FIG. 2a, the leg 6b is directed toward the front lens 2 by the arrow a (optical axis S). Parallel to) direction. As a result, the slide core 7 must be provided and slid in the direction of arrow b. When the slide core 7 as described above is provided, a division line L is generated on the inner surface of the front lens 2a, and the appearance quality is significantly deteriorated.

In order to enable the mold opening of the legs 6a and 6b without using the slide core 7 as described above, a portion 5A surrounded by a chain line in the conventional example of FIG. 4 is shown in FIG.
It is conceivable to improve as in (A). That is,
The leg 6a 'of the front lens 2'is provided with a reference axis S'parallel to the optical axis.
By inclining it by an angle θ, the mold can be opened in the direction of the arrow a ′. Reference numeral 10 is a hot melt filled in the seal groove 5a. Leg 6a 'as shown in FIG.
When the above is configured and is inserted and embedded in the hot melt 10 filled in the seal groove 5a, the following problems occur.

As shown in FIG. 5 (A), when the legs are pushed into the hot melt 10 in the seal groove 5a as shown in (a), (b) and (c), the legs are inserted in the direction (arrow p). The leg tilt direction (arrow a ') does not match. For this reason, the legs push the hot melt obliquely and enter, and the voids 11 are formed as shown in FIG. 5 (C). As described above, when the gap 11 is formed between the leg 6a 'and the hot melt 10, not only the mounting strength of the front lens 2 to the lamp housing 1 is lowered, but also the sealing performance is lowered and water intrusion may occur. . The present invention has been made in view of the above circumstances, and is suitable for a lens mounting structure in which there is no risk of causing a harmful dividing line in the front lens, and there is no risk of creating a gap between the lens leg and hot melt. The purpose is to

[0008]

As a structure for achieving the above object, a lens mounting structure according to the present invention is provided with a seal groove which is recessed toward the front of the lamp around the front opening of the lamp housing. and which, around the front lens is provided with legs projecting toward the rear of the lamp, and inserting the legs in the vehicle lamp which are bonded with a sealing agent to the seal groove, said one of said legs Insert into seal groove
In the part that is inclined with respect to the direction,
Inner first taper surface that does not cause dacat and the seal groove
Outside that does not cause undercut in the direction of pushing in
It is characterized in that a tapered surface composed of the second tapered surface on the side is formed.

[0009]

The operation of the lens mounting structure constructed as described above will be described below with reference to FIG. 2A corresponding to the first embodiment. In the embodiment shown in FIG. 5 (C), the leg 6a 'which is formed in a flat plate shape is replaced by the V-shaped leg 9a shown in FIG. 2 (A).
As described above, since it has a V-shaped cross section having tapered surfaces t ₁ and t ₂ , it is possible to open the mold in the direction of arrow a ′ when injection molding this with a synthetic resin material. When it is pushed into the hot melt 10 in the p direction, the taper surface spreads the hot melt and enters the hot melt 10, so that there is no possibility of forming voids.

[0010]

1 is a schematic sectional view of a vehicular lamp having an embodiment of a lens mounting structure according to the present invention. This vehicular lamp has been improved by applying the present invention to the conventional example shown in FIG. 4, and the parts having the same drawing reference numbers as in FIG. 4 are the same as or similar to those in the conventional example. It is a constituent part. Reference numeral 9 denotes a front lens made of a synthetic resin formed by applying the present invention, which is set to open in the direction of arrow a'during injection molding and has a slide core 12 which slides in the direction of arrow c. It is provided. The dividing line generated by the slide core 12 is not located in the effective portion of the front lens 9 (located in the tip portion of the leg 6b) and therefore does not appear in the appearance and is completely harmless.

The leg 9a of the front lens of this example has a V-shaped cross section and has a tapered surface in the direction of expanding toward the front of the lamp. FIG. 2A shows an enlarged detail of a portion 2A surrounded by a chain line in FIG. The arrow p indicates the rear with respect to the light projecting direction of the vehicle lamp, and is the mounting direction when the front lens 9 is mounted on the lamp housing 1. That is,
This is the pushing direction when pushing the V-shaped leg 9a into the hot melt 10 in the seal groove 5a.

The V-shaped leg 9a is a leg of the front lens 9.
Of which, the portion that is inclined with respect to the insertion direction into the seal groove 5a
And has taper surfaces t ₁ and t ₂ that contract in the direction of arrow p. When injection molding this V-shaped leg 9a ,
Since the first taper surface t ₁ does not undercut in the mold opening direction a ′, the mold opening is not hindered. Also, when pushing the V-leg 9a to the hot melt 10, the outer
Since the second tapered surface t ₂ of the V-shaped leg 9a does not undercut in the pushing direction p,
There is no risk of entering while pushing 0 apart and creating voids. As described above, in this embodiment, the dividing line that appears in the appearance of the front lens is not generated, and there is no possibility that a gap is generated between the lens leg and the hot melt (adhesive sealant).

FIG. 2B shows an embodiment different from the above.
The difference from the embodiment of FIG. 9A is that a V-shaped groove 13 is provided on the back side of the convex tapered surfaces t ₁ and t ₂ . FIG. 3 is a partial cross-sectional perspective view showing this embodiment.
According to the present embodiment, the wall thickness in the vicinity of the V-shaped leg 9a 'is substantially constant and there is no extra thick wall portion, so there is no risk of sink marks during injection molding with a synthetic resin material.

[0014]

As is apparent from the above-described embodiment, the lens mounting structure according to the present invention is provided with the seal groove, which is concave toward the front of the lamp, around the front opening of the lamp housing. A leg protruding toward the rear of the lamp is provided around the front lens, and in the vehicular lamp in which the leg is inserted into the seal groove and bonded with a sealant, the seal groove of the leg is used. In the insertion direction
Undercut in the mold opening direction
To the inner first taper surface and the seal groove
Second outer side that does not cause undercut in the direction of insertion
Since the taper surface composed of the taper surface is formed, there is no possibility that a harmful dividing line is generated in the front lens and there is no possibility that a gap is generated between the leg of the lens and the sealant.
Since no air gap is generated, the bonding strength between the front lens and the lamp housing is large, the sealing property of the bonding portion is perfect, and there is no risk of water leakage.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a vehicle lamp including an embodiment of a lens mounting structure according to the present invention.

FIG. 2A is an enlarged detailed view of a portion 2A of the above embodiment,
(B) is a sectional view of an embodiment different from the above.

FIG. 3 is a partially cutaway perspective view showing the embodiment shown in FIG.

FIG. 4 is a schematic sectional view of a conventional vehicle lamp.

5 is an explanatory view of the technical problem in the conventional example shown in FIG. 4 above.

[Explanation of symbols]

 1 Lamp Housing 2, 2'Front Lens 2a Lens Wrapping Part 3a, 3b Reflector 4a, 4b Light Source Bulb 5a, 5b Seal Groove 6a, 6a ', 6b Leg 7 Slide Core 9,9' Front Lens 9a, 9a 'V-shaped Groove 10 Hot melt 11 Void 12 Slide core 13 V-shaped groove A Headlight a, a ′ Mold opening direction B Turn signal lamp b, c Slide core sliding direction p Leg pushing direction S Vehicle reference axis (optical axis) S ′ Reference axis

Claims (1)

(57) [Scope of utility model registration request] 1. A seal groove that is recessed toward the front of the lamp is provided around the front opening of the lamp housing, and legs that project toward the rear of the lamp are provided around the front lens. In a vehicular lamp in which the leg is inserted into the seal groove and adhered with a sealant, the leg of the leg is inclined with respect to the inserting direction into the seal groove.
Undercut occurs in the inclined part in the mold opening direction.
No inner first taper surface and pushing into the seal groove
Second taper on the outside that does not undercut in the direction
Wherein the tapered surface comprising a surface is formed, the lens mounting structure of a vehicle lamp.