JPS6245362Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a headlamp for an automobile, and in particular to an automobile headlamp that is provided with a shade shade that covers a part of the light source bulb in order to prevent glare from the light source bulb. Regarding headlights.

[Prior art and its problems] In automobile headlights, the light that passes through the front lens and radiates upward from the horizon may dazzle oncoming drivers and pedestrians, or may cause problems when fog occurs. It causes a light curtain phenomenon during light rain. Therefore, in order to eliminate these inconveniences, in order to form a light distribution pattern in which light directed upwards from the horizon is cut off, a shade for shielding light that covers part of the front or surrounding area of the light source bulb is placed inside the lamp chamber together with the light source bulb. What is done is done. This type of shade is disposed so as to cover a part of the light source bulb and receives direct light from the light source bulb near the bulb, so that the shade part of the shade is heated to a high temperature of 200° C. or more. Therefore, this shade is made of metal and includes a light shielding part shaped to obtain an optimal light distribution pattern depending on the type of light source bulb, the shape of the reflector, etc. Figures 1A and 1B are views showing the mounting part of the shade in a conventional headlamp in which the shade is disposed in the lamp chamber, where a is a reflector with a reflective inner surface, b is a holder, and c is a reflector. A is a lamp chamber defined by a and a front lens (not shown), d is a light source bulb attached to the lamp chamber c via a holder b, and e is a metal shade. In FIG. 1B, the recess provided at the lower end of the shade e is crimped and crimped onto the flange of the holder b, and in FIG. 1A, the shade e is fixed to the holder b with screws.

However, as mentioned above, the metal shade e
is heated by the direct light from the light source bulb d, and because of its good heat conduction, thermal deformation occurs on the mounting part side.Also, the coefficient of thermal expansion is significantly different between the metal shade e and the synthetic resin holder b. It is easy for looseness to occur at the mounting part. Thermal deformation and rattling at the mounting portion of the shade e not only impair the appearance of the headlamp, but also impair the formation of an optimal light distribution pattern, posing a serious problem. In addition, when fixing a metal shade to the inner wall of a synthetic resin holder or synthetic resin reflector using mounting methods such as caulking, press-fitting, or embedding,
Since the mounting part on the holder or reflector side is relatively thin, cracks often occur due to over-tightening when fixing the shade.
The defective rate due to shade attachment was high. Furthermore, since the inner surface of the reflector is formed with a reflective inner surface that has undergone a coating process, if the shade is directly fixed to the inner wall, there is a risk that the coating will be damaged by the shade heated by the direct light from the bulb. .

《Purpose of the invention》 This invention was made in view of the above circumstances.
The purpose of this was to create a vehicle headlamp that could instantly and reliably fix a light-shielding shade in a fixed position on the inner wall of a synthetic resin reflector, and that also prevented the occurrence of wobbling at the shade mounting part. It is about providing.

<<Structure of the invention>> In order to achieve the above object, the automobile headlamp according to the present invention is a headlamp that is equipped with a light source bulb and a light shielding shade for preventing glare on the light source bulb, The shade is provided with at least one connecting member, such as a screw or a locking pin, and an engaging part for a stopper, and an engaged part for positioning is provided on the reflector side to which the shade is attached. and a thick part in which a part of the outer wall surface of the reflector protrudes outward in order to embed the connecting member, and the connecting member is inserted into the thick part by welding means such as ultrasonic waves. It is characterized by being welded.

《Description of Examples》 Fig. 2 shows an automobile headlamp to which the present invention is applied, and Fig. 2A is a front view of the headlamp;
Figure B is a sectional view taken along line A-A in Figure 2 A, and Figure 3 is a cross-sectional view of Figure 2.
It is an enlarged view showing the shade attachment part shown in the figure. In FIGS. 2 and 3, the synthetic resin reflector 1 forms a reflective inner surface 11 in the shape of a substantially paraboloid of revolution,
In addition, the surface is coated with aluminum or the like by vapor deposition to increase reflection efficiency. In addition, a front lens 2 is attached to the periphery of the opening of the reflector 1.
A groove 12 for arranging is formed in a circumferential manner,
The front lens 2 has a joint leg 21 formed on its periphery and is attached to the groove 12 via a sealant 3. A lamp chamber 4 is defined by these two members. A bulb holder 6 for attaching a light source bulb 5 is fitted into an opening 13 opened at the rear center of the reflector 1, and the light source bulb 5 is attached to the lamp chamber 4 via this bulb holder 6. In addition, 8 is a cap and valve holder 6
This is to fix the bulb holder 6 to the opening 13 of the reflector 1 and to keep the part through which the bulb holder 6 is inserted airtight. Further, in the lamp chamber 4, a metal shade 7 for shielding light that covers a part of the periphery of the light source bulb 5 is fixed near the opening 13 of the reflector 1, and is disposed together with the light source bulb 5.

The mounting part of this shade 7 is shown in Fig. 4A,
The details are shown in (b) and Figures 5 (a) and (b).
That is, the shade 7 includes a light shielding part 71 formed into a desired shape to cover a part of the light source bulb 5, a pair of legs 72 and a mounting part 73 that support the light shielding part 71. The attachment part 73 of the shade 7 is a fourth
As is clear from Figure A and Figure 4B, it has a stepped shape as a whole, and at its end there is an engaging part 7 for a stopper for attaching the shade 7 in a fixed position.
3a, and a pair of connecting members 9 are fixed to the stepped end surface by welding, press-fitting, or the like. The engaging portion 73a in the embodiment is formed by cutting out a part of the flange. In addition to using a screw as in this embodiment, a locking pin or the like may be used for the connecting member 9. Also,
It is also possible to form the locking pin 9a integrally with the shade 7 as shown in FIG. Note that various types of connecting members 9 can be used, but since the shade 7 is fixed by embedding this member in the reflector 1, the outer periphery of the connecting member 9 is tooth-shaped to strengthen prevention of slippage. It is preferable to form. Furthermore, an arbitrary number of connecting members 9 may be provided in consideration of the size of the shade 7, the embedding depth of the connecting member 9, and the like.

Near the rear opening 13 of the reflector 1 to which the shade 7 is attached, a pair of thick portions 14a and a positioning protrusion 15 are provided for inserting and embedding the pair of connecting members 9. The pair of thick portions 14a are provided at positions where the pair of connecting members 9 are inserted and welded, as shown in FIG.
3, a part of the outer wall surface of the reflector 1 is formed to protrude outward. In addition, in the embodiment, a guide hole 14b is provided in each of the pair of thick portions 14a (see FIG. 5A), so that the connecting member 9 can be easily inserted and welded into the thick portion 14a using ultrasonic waves. be. Further, the protrusion 15 which is the engaged part is connected to the shade 7.
This is for attaching the light source bulb 5 in a predetermined direction (arranging the light shielding part 71 of the shade 7 with respect to the filament in a predetermined position), and is formed in the shape of a protrusion large enough to engage the stopper engaging part 73a. do. In addition, in FIGS. 5A and 5B, 15 is a projection 16 for locking the bulb holder 6.
is a protrusion for locking the cap 8.
Although not shown in FIG. 3, the bulb holder 6 and cap 8 have recesses formed on their inner peripheries to correspond to the projections 15 and 16, respectively.

Next, regarding the automobile headlight having the above configuration,
One operation for attaching the metal shade 7 to the synthetic resin reflector 1 will be explained. First, an arbitrary number of connecting members 9 are fixed in advance to the mounting portion 73 of the shade 7 by means such as press-fitting or welding.
Then, while placing this shade 7 on the mounting part of the reflector 1 and rotating it, the stopper engaging part 73 of the shade 7 is attached to the protrusion 15 of the reflector 1.
a to determine the installation position of the shade 7. Thereafter, using an ultrasonic welding machine, the connecting member 9 is bonded to synthetic resin using a tool horn S that has been inserted into the shade 7 in advance and configured to abut the connecting member 9 of the shade 7 (see FIG. 7). It is inserted into the thick part 14a of the manufactured reflector 1 and welded.

<<Effect of the invention>> As mentioned above, in the automobile headlamp according to the present invention, at least one
At least one connecting member and a stopper engaging portion are provided, and a part of the outer wall surface of the reflector is protruded outward in order to embed the positioning protrusion and the connecting member on the side of the synthetic resin reflector to which the shade is attached. The connecting member is inserted and welded into the thick part by ultrasonic welding, so that the light-shielding shade can be firmly and firmly placed in a predetermined position on the synthetic resin reflector within a few seconds. It can be fixed to Also,
Generally, a reflector has a very large temperature gradient from its inner wall surface to its outer wall surface, and the closer it is to the outer wall surface, the less it is affected by heat. Therefore, in the present invention, the thick part for inserting and welding the connecting member is formed so that a part of the outer wall surface of the reflector protrudes outward from the reflector, so that the welded connecting member is not easily affected by heat. It has the effect of being able to be fixed firmly and stably.

[Brief explanation of the drawing]

FIGS. 1A and 1B are cross-sectional views showing conventional shade mounting parts in automobile headlights, and FIGS. 2 to 7 show automobile headlights according to the present invention. Figure 2 shows an automobile headlamp,
Figure 2 A is a front view, Figure 2 B is A-A in Figure 2 A.
Line sectional view, Figure 3 is an enlarged view of the shade attachment part, Figure 4 shows the shade, Figure 4 A is a side view, Figure 4 B is a bottom view, and Figure 5 is a view of the reflector side. The shade attachment part is shown, FIG. 5A is a plan view, FIG. It is a diagram. 1...Reflector, 2...Front lens, 3...
...Sealant, 4...Light chamber, 5...Light source bulb, 6
... Valve holder, 7 ... Shade, 9 ... Connection member, 14a ... Thick part, 14b ... Guide hole, 15 ... Protrusion, 73 ... Mounting part, 73a ...
Engagement part.

Claims (1)

[Scope of utility model registration request] An automobile headlamp in which a light source bulb is installed in a lamp chamber defined by a synthetic resin reflector and a lens arranged in front of the reflector, and a shade is provided to prevent glare from the bulb. The shade is provided with a connecting member and an engaging portion,
The reflector is provided with an engaged part for positioning the engaging part and a thick part in which a part of the outer wall surface of the reflector protrudes outward. An automobile headlamp characterized by being fixed by a welding means such as.