JPH1186605A - Lens welded type lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the production of abnormal sounds due to insufficient, or looseness of an inner lens. SOLUTION: An inner lens 4 of the lamp 1 is fixed with the pinching of either one of a housing 2 or an outer lens 3 and an excess thickness part 5 produced by plate welding of the housing 2 and the outer lens 3. The fixation utilizes the excess thickness part 5, which is produced by plastic deformation, when the housing 2 and the outer lens 3 are welded. Thus, the difference in dimensions and the like of the locking end 4a of the inner lens 4 by a manufacturing error or the like is absorbed by plasticity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp such as a headlamp and a tail lamp, and more particularly, to a vehicular lamp having a structure in which a housing and an outer lens are integrally welded by hot plate welding. It relates to a lamp.

[0002]

2. Description of the Related Art An example of the structure of a conventional lens-welded vehicle lamp 90 having an inner lens is disclosed in Japanese Unexamined Patent Publication No. 2-94301 by the same applicant. As shown in the drawing, a step portion 92a is provided in which the outer diameter of the inner lens 91 is dropped and fitted to the inner diameter of the housing 92.

The inner lens 91 has a stepped portion 9.
2a, the end face 91a is formed so as to be substantially flush with the end face 92b of the housing 92, and the outer lens 93 adjusts the thickness of the end face 93a to the end face 9 of the housing 92.
2 b and the end surface 91 a of the inner lens 91.

[0004] When assembling the lens welding type vehicle lamp 90 having the above-described components, the end surface 92b of the housing 92 and the end surface 93a of the outer lens 93 are heated and melt-softened by a hot plate (hot plate). If the inner lens 91 is dropped into the step portion 92a and the housing 92 and the outer lens 93 are pressed and joined by welding, the inner lens 91 is sandwiched and fixed between the housing 92 and the outer lens 93.

[0005]

However, in the lens-welded type vehicle lamp 90 having the above-described structure, in actual implementation, a manufacturing error occurs in each of the inner lens 91, the housing 92, and the outer lens 93. This is unavoidable, and a state where the end surface 91a of the inner lens 91 and the end surface 92b of the housing 92 are not flush with each other often occurs.

[0006] Further, the degree of softening between the housing 92 and the outer lens 93 also varies due to differences in work, such as the temperature of the hot plate and the length of time of application, so that the outer lens 93 after welding is formed. This also causes a difference in the position of the end surface 93a, so that, for example, the end surface 91a of the inner lens 91 is
If it is lower than 2b, or if the heating is insufficient, the holding by the outer lens 93 becomes insufficient,
This causes rattling and noise during traveling.

On the other hand, when the end surface 91a of the inner lens 91 is long, the welding between the housing 92 and the outer lens 93 is not sufficiently performed, and the strength is insufficient.
There will be problems such as a decrease in the airtightness of the lamp body due to the formation of a gap, and in order to maintain uniformity of quality, there are problems such as complicated processes and complicated management.
The solution of these points is an issue.

[0008]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, a lens having an inner lens and having a housing and an outer lens fixed by hot plate welding. In the welding type vehicle lighting device, the inner lens is fixed by being sandwiched between one of the housing and the outer lens and an excess portion generated when the housing and the outer lens are hot-plate welded. An object of the present invention is to solve the problem by providing a lens-welded type vehicle lamp characterized by being described.

[0009]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. The reference numeral 1 shown in FIG. 1 is a lens-welded type vehicle lighting device according to the present invention (hereinafter abbreviated as “welding type lighting device 1”). It is similar to the prior art in that it is heated and then pressed and welded.

[0010] Further, the point that the inner lens 4 is fixed at the same time when the housing 2 and the outer lens 3 are welded is the same as the conventional example. The end face 2a and the end face 3a of the outer lens 3 are formed to have the same thickness, and the inner lens 4 is directly formed by the outer lens 3 as in the conventional example.
Is not to be held down.

Here, the structure of the welding type lamp 1 will be described. First, the housing 2 has a stepped portion 2 on the inner diameter side.
The inner lens 4 is locked in the housing 2 by dropping the inner lens 4 into the step 2b with the locking end 4a at a predetermined position.

The housing 2 is provided with the step 2b.
Is provided, and an end face 2a is provided for welding to the outer lens 3. The end 2a is formed to be longer than the locking end 4a of the inner lens 4 by an appropriate dimension. The end surface 3a of the outer lens 3 is connected to the end surface 2 of the housing 2 as described above.
It is formed to have basically the same thickness as a.

FIG. 2 shows a state in which a heating plate 10 is sandwiched between an end surface 2a of the housing 2 and an end surface 3a of the outer lens 3 and heating is performed. The end face 2a of the housing 2 and the end face 3a of the outer lens 3 are in a molten state, and heat is conducted from the end faces 2a and 3a, so that the vicinity thereof is in a softened state.

FIG. 3 shows a state where the hot plate 10 is removed and the housing 2 and the outer lens 3 are welded by pressure welding. The end face 2a of the housing 2 and the end face 3a of the outer lens 3 are welded. Is performed, and the softened portions near the end faces 2a and 3a are also crushed due to the pressurization at the time of performing the welding, so that excess portions 5 projecting to both side surfaces are generated.

In the present invention, the inner lens 4 is locked by using the extra thickness portion 5, and as described above, the extra thickness portion 5 is formed in a softened state. Therefore, even when there is a difference in the position of the locking end 4a of the inner lens 4 due to a manufacturing error or the like, the locking end is deformed on the side of the excess thickness portion 5 so as to absorb the difference in size. Press down the part 4a.

Therefore, the inner lens 4 is
And the excess thickness portion 5, and at this time, the excess thickness portion 5 is solidified by cooling after the above-described pressure welding of the housing 2 and the outer lens 3 is performed.
The attachment is performed with sufficient strength.

FIG. 4 shows another embodiment of the present invention. In the previous embodiment, the inner lens 4 was sandwiched between the housing 2 and the excess portion 5, but the present invention is not limited to this. However, in this embodiment, a step 3b is provided on the outer lens 3 side, and the inner lens 4 is sandwiched between the step 3b and the excess portion 5.

That is, in the present invention, when the inner lens 4 is fixed, the inner lens 4 is softened at this time, and when the inner lens 4 encounters the locking end 4a, it is plastically deformed to the locking end 4a. There is a gist in absorbing and fixing the dimensional difference and the like by using the excess portion 5 which is in a state of being freely changed along the shape, and at this time, the other one which holds the inner lens 4 is used. It is not limited.

[0019]

As described above, according to the present invention, the fixing of the inner lens can be performed when any one of the housing and the outer lens is welded to the housing and the outer lens by a hot plate welding. By making it a lens welding type vehicle lamp that is carried out by sandwiching
When welding the housing and the outer lens, it shall be performed by using the excess part caused by plastic deformation at the same time, and the dimensional difference of the locking end of the inner lens due to manufacturing error etc. shall be absorbed by plasticity, joining This is an extremely excellent effect that solves all the conventional problems such as insufficient strength and generation of abnormal noise due to rattling of the inner lens.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a lens welding type vehicle lamp according to the present invention.

FIG. 2 is an explanatory diagram showing a main part of a heating step using a hot plate of the same embodiment.

FIG. 3 is an explanatory view showing a welding step in a main part in the same manner.

FIG. 4 is a sectional view showing another embodiment of the lens welding type vehicle lamp according to the present invention.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens welding type vehicle lamp 2 ... Housing 2a ... End part 2b ... Step part 3 ... Outer lens 3a ... End part 3b ... Step part 4 ... Inner lens 4a ... Locking end part 5 ... excess part 10 ... hot plate

Claims (1)

[Claims] 1. In a lens-welded vehicle lamp having an inner lens and a housing and an outer lens fixed by hot plate welding, the inner lens is fixed to one of the housing and the outer lens. A lens welding type vehicle lamp characterized in that the housing and the outer lens are sandwiched by a surplus portion generated when a hot plate is welded.