JPS5930963Y2 - Light bulb mounting structure for vehicle headlights - Google Patents

Description

[Detailed description of the invention] The present invention relates to a light bulb mounting structure for a vehicle headlamp, and in particular, to provide good workability when mounting a light bulb to a synthetic resin reflector and to align the light bulb with respect to the reflector. The present invention aims to provide a new light bulb mounting structure that is easy to install.

Due to the demand for weight reduction in automobiles and technological improvements such as resin molding technology and resin surface metallization technology, synthetic resin reflectors have recently begun to be used in vehicle headlights.

However, the best structure for attaching a light source to a synthetic resin reflector has not been provided.
There were problems such as poor workability and difficulty in aligning the light bulb with the reflector.

For example, a cylindrical receiving part is formed on the reflecting mirror side, and a light bulb is held in a holder shaped to fit inside this receiving part.
A structure in which this holder is fixed to the receiving part is considered, but using adhesive for this fixation would take too much time until it is completely fixed and would not be suitable for mass production, and the positional relationship between the reflector and the light bulb The disadvantage is that in order to maintain the correct relationship between the two, the two must be maintained in a relationship until solidification.

Although it is possible to shorten the fixing time by using an instant adhesive, currently available instant adhesives attack the thermoplastic synthetic resin such as polycarbonate that is the base material of the reflector and holder, and also have poor heat resistance. Shall be used in low light fixtures7
It's not appropriate.

Therefore, the present invention has developed a new bulb mounting structure for vehicle headlights that is easy to work with when attaching a bulb to a synthetic resin reflector and allows for easy alignment of the bulb with respect to the reflector. A cylindrical receiver, whose front end is open inside the reflector and whose rear end is also open, is integrally installed at a suitable place on a reflector made of thermoplastic synthetic resin, and protrudes rearward, and a light bulb is inserted into the reflector. A holder made of thermoplastic synthetic resin, comprising a cylindrical front part sized to fit tightly into the receiving cylinder, and a rear part having a smaller outer diameter than the front part and having several protrusions formed thereon. is fitted into the receiving tube, the inner surface of the receiving tube and the outer surface of the projection are fixed by heat welding or ultrasonic welding, and the annular space formed between the rear part of the holder and the inner surface of the receiving tube is filled with adhesive and solidified. It is characterized by:

The details of the bulb mounting structure of the vehicle headlamp of the present invention will be explained below with reference to the accompanying drawings showing embodiments.

Reference numeral 1 denotes a reflecting mirror made of thermoplastic synthetic resin such as polycarbonate, and is integrally formed with a cylindrical receiver 2 that protrudes rearward from an appropriate location. It is opened in the mirror.

A reflective surface is formed on the inner surface of the reflecting mirror 1 by vacuum evaporation or the like, but a separate reflective plate may be provided on the inner surface if necessary.

Thin wall portions 3, 3, which are formed by scraping the outer circumferential surface of the receiver tube 2, are formed at several locations.

4 is a light source unit, which is separated from a light bulb 5, a terminal 6.6, and a molded portion 7 serving as a holder.

The mold part 7 is made of thermoplastic synthetic resin, in which the intermediate part of the terminal 6.6 is embedded, and the rear end of the terminal 6.6 protrudes from the rear end surface of the mold part 7.
Further, the front end of the terminal 6.6 projects from the front end surface of the mold portion 7.

The light bulb 5 is of a type without a base, and external lead wires 9, 9 led out from the pinch seal part 8 are soldered to the front end of a terminal 6.6 protruding from the front end surface of the mold part 7. It is fixed by caulking etc.

The mold part 7 consists of a front part 10 and a rear part 11.

The front portion 10 has a cylindrical shape, and its outer diameter is approximately equal to the inner diameter of the receiving tube 2 of the reflecting mirror 1.

The rear part 11 has a cylindrical shape with an outer diameter smaller than that of the front part 10, and a number of protrusions 12, 12, etc. are provided on the outer circumferential surface of the rear part 11 at appropriate intervals. and the circle containing the outer surface of the protrusions 12.12... is aligned with the circle containing the outer peripheral surface of the front part 10, so that the protrusions 12.12... The outer surface of the reflector 1 comes into sliding contact with the inner surface of the receiver tube 2 of the reflecting mirror 1.

Thus, the light source unit 4 is inserted into the receiver 2 of the reflector 1 from the rear side with the bulb 5 side facing forward, the front part 10 of the molded part 7 is tightly fitted into the receiver 2, and the rear part 11 is inserted into the receiver 2 of the reflector 1. Protrusion 12
．． 12...The outer surface is brought into sliding contact with the inner surface of the receiving cylinder 2.

Then, the mold part 7 is slid in the front-rear direction or rotational direction with respect to the receiving tube 2 to correctly position the light bulb 5 with respect to the reflector 1, and when the position is determined, the protrusion 12 of the mold part 7. 12... and the receiving tube 2 are temporarily fixed by ultrasonic welding, heat welding, etc.

When performing this temporary attachment, the welding efficiency is improved if the portions where the protrusions 12, 12, .

Therefore, when it is necessary to move the light source unit 4 only in the axial direction, as shown in the figure, the thin wall portion 3 of the receiving tube 2 extending in the axial direction,
3, but if it is necessary to rotate around the axis for adjustment, it is better to make the thin part long in the circumferential direction as well.

Protrusion 12° 12 of mold part 7 of light source unit 4...
... is welded to the receiving tube 2 of the reflecting mirror 1, the outer diameter will be the same as that of the receiving tube 2.
An annular space 13 is formed between the rear part 11 of the mold part 7 and the receiving tube 2, which is smaller than the inner diameter of the mold part 7.

Then, by arranging the space 13 so that the opening faces upward, and injecting the adhesive 14 into the space 13 and solidifying it, the light source unit 4 is completely fixed to the reflecting mirror 1. .

As described above, in the light bulb mounting structure of the vehicle headlamp of the present invention, a receiver is formed on the thermoplastic synthetic resin reflector, and a receiver is formed on the thermoplastic synthetic resin holder that holds the light bulb. A cylindrical front part that is large enough to fit tightly into the cylinder and a rear part that has a smaller outer diameter than the front part and has several protrusions are provided, and the protrusions and the cylindrical part are welded by heat or ultrasonic welding. The adhesive is filled and solidified in the space created between the rear of the holder and the inner surface of the cylindrical part, so when aligning the reflector and the bulb, it is necessary to temporarily attach the space between the protrusion and the cylindrical part. After that, all you have to do is fill the space with adhesive and leave it until it hardens, so there is no need to use a special jig to hold the reflector and holder until the adhesive hardens. Although it uses adhesive, it has very good workability.

Furthermore, since the space filled with the adhesive is annular, the space between the holder and the receiving tube is completely sealed over the entire circumference, making it possible to seal the inside of the reflecting mirror.

[Brief explanation of the drawing]

The drawings show an example of the bulb mounting structure of the vehicle headlamp of the present invention, in which Fig. 1 is a perspective view, Fig. 2 is an exploded perspective view,
FIG. 3 is a sectional view taken along line III--III in FIG. 1. Explanation of symbols 1... Reflector, 2... Receiver, 5... Bulb, 7°°゛°... Mold part.
, 10...front, 11...rear, 12
・・・Protrusion, 13 ・・・Annular space, 14
······glue.

Claims (1)

[Scope of utility model registration request] A cylindrical receiver, whose front end is open inside the reflector and whose rear end is also open, is integrally provided at a suitable location on a reflector made of thermoplastic synthetic resin, and projects rearward to hold a light bulb. A holder made of thermoplastic synthetic resin is placed in the receiving cylinder, and the holder is made of a cylindrical front part that is large enough to fit tightly into the receiving cylinder, and a rear part that is smaller in outer diameter than the front part and has several protrusions formed thereon. The inner surface of the receiving tube and the outer surface of the projection are fixed by heat welding or ultrasonic welding, and the annular space formed between the rear part of the holder and the inner surface of the receiving tube is filled with an adhesive and solidified. Bulb mounting structure for vehicle headlights.