JPH0443974Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an automobile light bulb that is suitably used in automobile illumination lights, such as fog lamps and headlights.

[Technology background]

Automotive light bulbs generally consist of an incandescent light bulb and a cap, but since automotive light bulbs are used in situations where they are susceptible to large vibrations, particularly excellent vibration resistance is required to prevent the incandescent light bulb from shifting its position. At the same time, in order to achieve an appropriate light distribution state in a car, the light center distance, that is, the distance between the level of the flange-shaped positioning plate formed on the cap and the filament coil of the incandescent light bulb, must be a certain value. It is necessary for the base to be fixed to the incandescent lamp in a certain state.

For this reason, in the past, the crimp sealing part of the incandescent light bulb was inserted into the tube of the cylindrical cap, the positional relationship between the two was adjusted, and then the two were fixed with adhesive. However, this method has the disadvantage that the bonding work requires a considerable amount of time and the manufacturing process is very laborious.

[The problem that the idea attempts to solve]

For this reason, recently, protrusions are provided on both sides of the flat crimp-sealed part of an incandescent light bulb, and a pair of tongue pieces are formed by cutting and raising a part of the corresponding cylindrical wall of the cap. Means for fixing the incandescent light bulb is employed by locking the piece to the protrusion of the crimp seal.

However, the conventional locking method using protrusions and tongues does not necessarily secure the base to the incandescent light bulb sufficiently, so the position of the incandescent light bulb can be relatively easily misaligned, and the light center distance cannot be adjusted to a predetermined distance. However, there are problems in that it is difficult to achieve a high temperature and is not easy to manufacture.

The present invention has been made to solve the above problems.

[Means for solving problems]

The automotive light bulb of the present invention includes an incandescent light bulb comprising an envelope having a flat crimp seal at one end, and a cylindrical portion having a substantially rectangular cross section arranged to surround the crimp seal of the incandescent light bulb. The cap includes an upper tongue piece and a lower tongue piece that are formed by cutting and raising a cylinder wall facing each of the pair of wide surfaces of the crimp sealing part so as to be aligned in the axial direction. , a flange-like position adjustment plate, and the incandescent light bulb has a pair of wide surfaces of the crimp sealing portion, each of which is formed in series so as to be vertically aligned with each other to form a V-shaped groove therebetween. an upper protrusion and a lower protrusion, the tip of the upper tongue abuts the lower protrusion, and the upper surface of the upper tongue abuts a slope of the upper protrusion extending along the upper protrusion; The height of the upper protrusion is higher than that of the lower protrusion.

[Function and effect of the idea]

According to this configuration, the upper tongue piece and the lower tongue piece, which are cut and raised in the axial direction on the cap, come into contact with the pair of wide surfaces of the crimp sealing part, so that the crimp sealing part is Due to the pinched pressure, the base is fixed to the incandescent bulb with great holding force. In addition, the tip of the upper tongue piece formed on the cap comes into contact with the lower protrusion formed on the wide surface of the crimp sealing part, and
The upper surface of the upper tongue comes into contact with the slope portion of the upper projection extending along the upper surface, and as a result, the tip of the upper tongue forms a V-shape formed by the upper projection and the lower projection. Since it is fitted into the groove, the cap is always fixed in a fixed position relative to the filament coil of the incandescent light bulb, and a predetermined light center distance can be reliably obtained.
In addition, since the height of the upper protrusion is higher than the lower protrusion, when inserting and arranging the crimp-sealed portion of the incandescent lamp into the base, the upper tongue piece can easily overcome the lower protrusion, which is lower, so that the upper protrusion automatically moves upward. Since the fitting state between the tongue piece and the V-shaped groove is achieved, no position adjustment is required and the automobile light bulb can be manufactured very easily.

[Specific structure of the idea]

Hereinafter, the configuration of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory partial cross-sectional view of an automobile light bulb according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts thereof.

As shown in the figure, the incandescent light bulb 10 has a flat crimp sealing part 11 at one end, and each of the pair of wide surfaces 12 of the crimp sealing part 11 has an upper protrusion 13 and an upper protrusion 13 on the same level. The lower protrusions 14 are provided vertically and continuously, and a V-shaped groove 15 is formed between the upper protrusions 13 and the lower protrusions 14. 16 is a glass enclosure, 17 is a filament coil, and 18 is the remainder of the exhaust pipe.

The upper protrusion 13 and the lower protrusion 14 each have a substantially triangular cross section with two sloped parts, and the upper protrusion 13 from the wide surface 12
The height H is higher than the height h of the lower protrusion 14.

The cap 20 has a cylindrical portion 21 made of a metal plate and has a substantially rectangular cross section, and is arranged so as to surround the crimp sealing portion 11 of the incandescent light bulb 10. 23 is a flange-like position adjustment plate.

A cylindrical wall 2 of the cylindrical portion 21 of the cap 20 facing each of the pair of wide surfaces 12 of the crimp sealing portion 11
2, the upper tongue piece 3 is cut and raised so that two tongue pieces facing downward are lined up in the vertical direction, which is the axial direction.
1 and a lower tongue piece 32 are formed. The two upper tongue pieces 31 and the two lower tongue pieces 32 are formed to be at the same level, and the tip of each upper tongue piece 31 is elastically attached to the upward slope 141 of the lower projection 14. The upper tongue piece 31 is in a state of being in contact with and extending along the downward slope 131 of the upper stage protrusion 13, so that the tip of the upper tongue piece 31 is fitted into the V-shaped groove 15. It's summery. Further, the tip of each lower tongue piece 32 is elastically abutted against the surface of the wide surface 12 below the lower protrusion 14 .

According to the above configuration, the two upper tongue pieces 31 abut each other on each of the pair of wide surfaces 12 of the crimp-sealed portion 11 of the incandescent light bulb 10, so that the crimp-sealed portion is at the same level. 11 is elastically pinched from both sides, and the two lower tongue pieces 32 come into contact with each other at a position below the upper tongue piece 31, so that the crimp sealing part 11 is pressed at the same level.
Since the cap 20 is elastically compressed from both sides, the cap 20 is basically fixed to the crimp sealing portion 11 of the incandescent light bulb 10 with a large holding force. Moreover, the upper tongue piece 31 is not simply brought into contact with the wide surface 12 of the crimp sealing part 11, but its tip is brought into contact with and locked with the lower protrusion 14 formed on the wide surface 12. The cap 2 is moved downward in the axial direction (vertical direction) by
0 displacement is prevented, and since its upper surface is in contact with the downward slope 131 of the upper protrusion 13 and extended, the downward slope 131 acts as a stopper to prevent the upward displacement of the cap 20. is prevented. Therefore, the cap 20 is extremely firmly attached to the crimp-sealed portion 1 of the incandescent light bulb 10 without any displacement.
Fixed to 1.

Further, during manufacturing, the base 20 is arranged by inserting the crimp sealing part 11 of the incandescent light bulb 10 through the opening at the upper end of the cap 20.
In the two-stage protrusion formed on the wide surface 12 of 1, the height h of the lower protrusion 14 is smaller than the height H of the upper protrusion 13, so the upper tongue piece 31 can easily climb over the lower protrusion 14. As well as being able to
The crimp-sealing portion 1 of the incandescent light bulb 10 is surely abutted and locked against the downward slope 131 of the upper protrusion 13.
1 into the base 20 so that the upper tongue piece 31 is V.
It can be completely assembled by simply advancing it until it is dropped into the groove 15. Moreover, when the upper tongue piece 31 is fitted into the V-shaped groove 15 in this way, the incandescent light bulb 10 and the base 20 have a specific positional relationship, so that the V-shaped groove 15 and the tip of the upper tongue piece 31 By setting the incandescent bulb 10 at a specific position, the position adjustment plate 23 and the filament coil 17 of the incandescent bulb 10 can be easily adjusted by simply inserting the incandescent bulb 10 into the base 20, fitting it, and attaching it.
An optical center distance LCL of a predetermined length can be obtained between them, and therefore, there is no need to actually adjust the position of the cap 20, making manufacturing extremely easy.

As described above, in the automotive light bulb of the present invention, the base is fixed to the incandescent light bulb with sufficient holding force, and
Since the tip of the upper tongue piece is fitted into the V-shaped groove formed by the upper protrusion and the lower protrusion,
The cap is always fixed in a specific positional relationship with respect to the filament coil of the incandescent light bulb, so it is possible to reliably obtain a predetermined light center distance, and the crimp sealing part of the incandescent light bulb can be fixed to the cap. Since the above-mentioned fitted state is automatically achieved when the device is inserted into the device, manufacturing thereof is extremely easy.

[Brief explanation of drawings]

FIG. 1 is an explanatory partial cross-sectional view of an automobile light bulb according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts thereof. 10...Incandescent light bulb, 11...Crimp sealing part, 12
...Wide surface, 13... Upper protrusion, 14... Lower protrusion, 15... V-shaped groove, 16... Glass enclosure, 1
7... Filament coil, 18... Exhaust pipe remainder, 20... Base, 21... Rectangular cylinder part, 22
... cylinder wall, 23 ... position adjustment plate, 31 ... upper tongue piece, 32 ... lower tongue piece, 131 ... downward slope, 1
41...Upward slope.

Claims (1)

[Claims for Utility Model Registration] An incandescent light bulb comprising an envelope having a flat crimp-sealed portion at one end, and a cylindrical portion with a substantially rectangular cross section arranged to surround the crimp-sealed portion of the incandescent light bulb. The cap includes an upper tongue piece and a lower tongue piece that are formed by cutting and raising a cylinder wall facing each of the pair of wide surfaces of the crimp sealing part so as to be aligned in the axial direction. , a flange-like position adjustment plate, and the incandescent light bulb has a pair of wide surfaces of the crimp sealing portion, each of which is formed in series so as to be vertically aligned with each other to form a V-shaped groove therebetween. an upper protrusion and a lower protrusion, the tip of the upper tongue abuts the lower protrusion, and the upper surface of the upper tongue abuts a slope of the upper protrusion extending along the upper protrusion; An automobile light bulb characterized in that the height of the upper protrusion is higher than that of the lower protrusion.