JPH103892A - Bulb for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proof bulb for automobile at a low cost, which can remarkably restrict the amplitude of a shield, by crushing a part of a cylindrical common lead wire so as to form a flat surface part, and providing a shield so as to abut on the flat surface part, and welding it at the time of assembling a bulb for automobile. SOLUTION: A common lead wire 4, a low beam filament, a lead wire for low beam filament, a main beam filament, and a lead wire for main beam filament are housed inside of a glass ball of a bulb for automobile, and a shield 5 provided along the low beam filament is welded to the common lead wire 4. This part of the common lead wire 4, to which the shield 5 is welded, is crushed by plastic working so as to form a flat surface part, and the shield is made to abut on this flat part. With this structure, surface junction is substituted for point junction of the conventional method, and the shield 5 can be strongly fitted to the common lead wire 4, and amplitude of the shield 5 can be thereby restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-resistant automobile light bulb.

[0002]

2. Description of the Related Art FIG. 9 is a side view of a conventional automobile light bulb called so-called H4. An automobile light bulb 100 includes a glass bulb 101 and a base 10 for closing an opening of the glass bulb 101.
2, a common conductor 103, a cup-shaped shield 104 welded to the upper part of the common conductor 103, and a passing beam filament 1 arranged along the shield 104.
05, the same conducting wire 106, the traveling beam filament 107 arranged below the shield 104, and the same conducting wire 10
8 and a reinforcing bridge 109, and the glass ball 10
1, a halogen gas is sealed. One end of the passing beam filament 105 is fixed to the conducting wire 106 via the chip 105a, and the other end is fixed to the shield 104 via the chip 105b.

[0003] Three lead wires 103, 10 from the base 102 side.
Since the wires 6, 108 project in a cantilever manner, these wires 103, 106, and 108 swing greatly toward the tips (upper ends) when subjected to vibration. The shield 104 further away from the base 102 has a large amplitude, and if the shield 104 is not firmly welded to the common conductor 103, a response delay occurs in the shield 104 with respect to the common conductor 103,
The amplitude is further increased, and the stress of the passing beam filament 105 disposed along the amplitude is increased, resulting in shortening the life. Therefore, a “bulb” disclosed in Japanese Utility Model Laid-Open Publication No. 64-2356 has been proposed. The suggested bulb is shown below.

FIG. 10 is a side view of a conventional vibration-proof automobile light bulb.
A base 112 for closing the opening of the glass sphere 111, and a common conductor 113 whose tip reaches the neck 111 a of the glass sphere 111
A cup-shaped shield 114 welded in the middle of the common conductor 113, a passing beam filament 115 arranged along the shield 114,
6, a traveling beam filament 117 disposed below the shield 114, a conductive wire 118, and a reinforcing bridge 119, and a halogen gas is sealed in the glass bulb 111. Passing beam filament 11
One end of 5 is fixed to the conducting wire 116 via the chip 115a, and the other end is fixed to the shield 114 via the chip 115b.

The common conductor 113 has a tip 111
Since the beam is supported at both ends and is fixed to a, the deflection is much smaller and the amplitude is smaller than that of the cantilever. Therefore, the life of the passing beam filament 115 is greatly extended. For this reason, the light bulb 110 in which the top of the common conductor 113 is locked to the glass bulb 111 is referred to as a vibration-resistant automobile light bulb.

FIG. 11 is a sectional view taken along line 11-11 of FIG. 10. The cup type shield 114 is fixed to the common conductor 113 by a projection welding method (project welding method). More specifically, a small projection is formed from the metal shield 114 to the right in the figure, and this projection is brought into contact with the common conductor 113 and energized to concentrate the current on the projection and fuse it with Joule heat.

[0007]

When subjected to vibration, the shield 114 may swing about the welding point 121 as indicated by an arrow. Then, the passing beam filament 1 having one end attached to the conductor 116 and the other end attached to the shield 114 is provided.
15 also has the disadvantage of vibrating. Therefore, an object of the present invention is to improve the method of fixing the shield and to firmly fix the shield to the common conductor.

[0008]

According to a first aspect of the present invention, a flat portion is formed by crushing a part of a common conductor by a plastic working method, and a shield is brought into contact with the flat portion to weld the common portion. It is characterized by having done. Since the conventional point joining is replaced with the surface joining, the shield can be firmly attached to the common conductor, and the amplitude of the shield can be suppressed.

According to a second aspect of the present invention, the shield comprises a cup portion and a tongue portion extending upward from an upper edge of the cup portion,
A holding groove is formed in the upper part of the tongue, and the common conductor is sandwiched by the holding groove, and a part of the common conductor is crushed by a plastic working method to form a flat portion, and a shield is applied to the flat portion. It is characterized by being welded in contact. Since the mounting of the shield, which has conventionally been point bonding, is replaced by surface bonding, the shield can be firmly mounted on the common conductor, and the amplitude of the shield can be suppressed. Further, even if the rigidity is reduced by crushing a part of the common conductor, the decrease can be compensated for by the holding groove, so that the rigidity can be shared and sufficient rigidity can be secured.

According to a third aspect of the present invention, the shield comprises a cup portion and a tongue portion extending upward from an upper edge of the cup portion,
A part of the tongue is bent toward the common conductor side to form a folded piece, and the folded piece is welded to the common conductor, and a part of the common conductor is crushed by a plastic working method to form a flat part, and the flat part is formed. The shield is abutted on the portion and welded. Since the shield is welded to the common conductor at two locations, the folded piece and the cup, the amplitude of the shield can be suppressed. Since the mounting of the shield, which has conventionally been point bonding, is replaced by surface bonding, the shield can be firmly mounted on the common conductor, and the amplitude of the shield can be suppressed. Also, even if the rigidity is reduced by crushing a part of the common conductor,
Since this decrease can be compensated for by the folded pieces, the rigidity can be shared, and sufficient rigidity can be secured.

According to a fourth aspect of the present invention, the shield comprises a cup portion and a tongue portion extending upward from an upper edge of the cup portion,
A part of the tongue is bent toward the common wire to form a folded piece, and the folded piece is welded to the common wire, and the cup portion is welded to the common wire. Since the shield is welded to the common conductor at the two locations of the folded piece and the cup, the rigidity of both the shield and the common conductor can be added, and the amplitude of the shield can be suppressed. In addition, since the flattening process of the common conductor is unnecessary, the processing cost is reduced.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a main part of an automotive light bulb (first embodiment) according to the present invention.
Comprises a glass ball 2, a common conductor 4, a shield 5, a low beam filament 6, and a common conductor 7. One leg 6a of the low beam filament 6 is welded to the upper part of the shield 5 and the other leg 6b is welded to the conductor 7. At the same time, the shield 5 is welded to the common conductor 4 at welding points W1 and W2. The upper end of the common conductor 4 is sandwiched between the necks 2a.

FIG. 2 is an exploded perspective view of a main part of an automotive light bulb (first embodiment) according to the present invention.
The flat portion 10 is formed by a plastic working method.

FIGS. 3A to 3C are plan sectional views of a common conductor according to the present invention. (A) is a plan view in which a part of a round bar-shaped common conductor 4 is crushed from both sides to form a plane portion 10. The flat portion 10 hits the shield 5 with a large area. Therefore, the amplitude of the shield 5 becomes difficult. (B) is obtained by crushing a part of a round bar-shaped common conductor preform from only one side to form a flat portion 10. The flat portion 10 hits the shield 5 with a large area. Therefore, the amplitude of the shield 5 becomes difficult. (C) is obtained by crushing a part of the round bar-shaped common conductor base material from one side so that the cross section becomes substantially T-shaped. Although the plane portion 10 is slightly narrower, the rigidity of the common conductor is increased because the cross-sectional area is sufficiently large.

(A) is easy to work because the mold is simple because the heart is in contact. On the other hand, since (b) is eccentric,
The mold becomes slightly complicated. Since the mounting of the shield, which has conventionally been point bonding, is replaced by surface bonding, the shield can be firmly mounted on the common conductor, and the amplitude of the shield can be suppressed.

FIG. 4 is a front view of a main part of an automobile light bulb (second embodiment) according to the present invention.
6, a tongue 27 protruding from the upper side, a ridge 28 formed in the middle of the tongue 27, and a holding V-groove 29 formed on the upper part of the tongue 27. The ridge 28 is a portion for joining one foot 6 a of the passing beam filament 6.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 10 is formed. The shield 25 has the cup 26 joined to the common wire 4 at the welding points W6 and W7, and the upper V-groove 29 is
The S-shaped portion 4a.

The shield 25 swings around the common conductor 4 around the welding points W6 and W7. However, since the V-groove 29 is engaged with the common conductor 4, there is no concern about this. That is, the V-groove 29 is separated from the swing point by the distance L1, and the amplitude can be sufficiently suppressed. In addition, since the shield, which was conventionally a point joint, is replaced by a surface joint, the shield can be firmly attached to the common conductor, and the amplitude of the shield can be suppressed. Further, even if the rigidity is reduced by crushing a part of the common conductor 4, the decrease can be compensated for by the holding groove 29, so that the rigidity can be shared.
Sufficient rigidity can be secured.

FIGS. 6 (a) to 6 (c) are main part manufacturing views of an automobile light bulb (third embodiment) according to the present invention. In (a), a relatively short ridge 37 is formed on the tongue 36 of the shield 35, and a relatively long cut 38 is formed in the base. 39 is a mountain fold line. In (b), the tongue 36
The left part is folded inward to form a folded piece 41.
Then, the folded piece 41 and the cup portion 42 are applied to the common conductor 4. However, the projections for project welding are not shown. In (c), the cup portion 42 of the shield 35 is fixed to the common conductor 4 at welding points W6 and W7, and the folded piece 41 is fixed at welding points W8, W9 and W10.

FIG. 7 is a side view of a main part of an automobile light bulb (third embodiment) according to the present invention.
ＷW10 indicates that it is fixed to the common conductor 4 and that the common conductor 4 has the flat portion 10 formed.

The shield 35 tends to swing around the common conductor 4 around the welding points W6 and W7.
Is welded to the common conductor 4, so there is no need to worry.
That is, the folded piece 41 is separated from the swing point by the distance L2, and the amplitude can be sufficiently suppressed. In addition, since the mounting of the shield, which was conventionally point bonding, is now a surface bonding, the shield can be firmly mounted on the common conductor,
The amplitude of the shield can be suppressed. Further, even if the rigidity is reduced by crushing a part of the common conductive wire 4, the decrease can be compensated for by the folded piece 41, so that the rigidity can be shared and sufficient rigidity can be secured.

FIG. 8 is a side view of a main part of an automobile light bulb (fourth embodiment) according to the present invention, wherein a shield 35 is provided at a welding point W6.
ＷW10 indicates that it is fixed to the common conductor 4.

The shield 35 swings around the common conductor 4 around the welding points W6 and W7.
Is welded to the common conductor 4, so there is no need to worry.
That is, the fold 41 is separated from the swing point by the distance L3, and the amplitude can be sufficiently suppressed. Shield 35
Is welded to the common conductor at the two locations of the folded piece 41 and the cup portion, so that the rigidity of both the shield and the common conductor can be added, and the amplitude of the shield can be suppressed. In addition, compared to the third embodiment, since the degree of processing of the common conductor 4 is lower, it is possible to suppress an increase in processing cost.

It is effective to apply the present invention to an anti-vibration bulb (see FIG. 10) in which the tip of the common conductor 4 is locked to the glass bulb 2, but to a general-purpose bulb (see FIG. 9). May be. Further, the holding groove 29 may be any one of a V-shaped groove, a U-shaped groove and a trapezoidal groove.

[0025]

According to the present invention, the following effects are exhibited by the above configuration. A first aspect of the present invention is characterized in that a flat portion is formed by crushing a part of the common conductive wire by a plastic working method, and a shield is brought into contact with the flat portion and welded. Since the conventional point joining is replaced with the surface joining, the shield can be firmly attached to the common conductor, and the amplitude of the shield can be suppressed.

According to a second aspect of the present invention, the shield comprises a cup and a tongue extending upward from an upper edge of the cup.
A holding groove is formed in the upper part of the tongue, and the common conductor is sandwiched by the holding groove, and a part of the common conductor is crushed by a plastic working method to form a flat portion, and a shield is applied to the flat portion. It is characterized by being welded in contact. Since the mounting of the shield, which has conventionally been point bonding, is replaced by surface bonding, the shield can be firmly mounted on the common conductor, and the amplitude of the shield can be suppressed. Further, even if the rigidity is reduced by crushing a part of the common conductor, the decrease can be compensated for by the holding groove, so that the rigidity can be shared and sufficient rigidity can be secured.

According to a third aspect of the present invention, the shield comprises a cup and a tongue extending upward from an upper edge of the cup.
A part of the tongue is bent toward the common conductor side to form a folded piece, and the folded piece is welded to the common conductor, and a part of the common conductor is crushed by a plastic working method to form a flat part, and the flat part is formed. The shield is abutted on the portion and welded. Since the shield is welded to the common conductor at two locations, the folded piece and the cup, the amplitude of the shield can be suppressed. Since the mounting of the shield, which has conventionally been point bonding, is replaced by surface bonding, the shield can be firmly mounted on the common conductor, and the amplitude of the shield can be suppressed. Also, even if the rigidity is reduced by crushing a part of the common conductor,
Since this decrease can be compensated for by the folded pieces, the rigidity can be shared, and sufficient rigidity can be secured.

According to a fourth aspect of the present invention, the shield comprises a cup portion and a tongue portion extending upward from an upper edge of the cup portion,
A part of the tongue is bent toward the common wire to form a folded piece, and the folded piece is welded to the common wire, and the cup portion is welded to the common wire. Since the shield is welded to the common conductor at the two locations of the folded piece and the cup, the rigidity of both the shield and the common conductor can be added, and the amplitude of the shield can be suppressed. In addition, since the flattening process of the common conductor is unnecessary, the processing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an automotive light bulb (first embodiment) according to the present invention.

FIG. 2 is an exploded perspective view of a main part of the automotive light bulb (first embodiment) according to the present invention.

FIG. 3 is a cross-sectional plan view of a common conductor according to the present invention.

FIG. 4 is a front view of a main part of an automobile light bulb (second embodiment) according to the present invention.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is an essential part manufacturing view of an automobile light bulb (third embodiment) according to the present invention.

FIG. 7 is a side view of a main part of an automobile light bulb (third embodiment) according to the present invention.

FIG. 8 is a side view of a main part of an automobile light bulb (fourth embodiment) according to the present invention.

FIG. 9 is a side view of a conventional automobile light bulb.

FIG. 10 is a side view of a conventional vibration-proof automobile light bulb.

11 is a sectional view taken along line 11-11 of FIG. 10;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Auto bulb, 2 ... Glass ball, 2a ... Neck part, 4
... common conductor, 5 ... shield, 6 ... passing beam filament, 7 ... same use conductor, 8 ... running beam filament,
9: same conductor, 10: flat part, 25, 35: shield,
26, 42 ... cup part, 27, 36 ... tongue part, 28, 37
... convex ridge, 29 ... clamping groove (V groove), 41 ... folded piece, W
1, W2, W5 to W10 ... welding points.

Claims (4)

[Claims] 1. An automotive vehicle in which a common wire, a low beam filament, a common wire, a traveling beam filament, and a common wire are housed inside a glass ball, and a shield along the low beam filament is welded to the common wire. A light bulb for an automobile, wherein a flat portion is formed by crushing a part of the common conductor by a plastic working method, and the flat portion is welded by contacting the shield. 2. An automotive vehicle in which a common wire, a low beam filament, a common wire, a traveling beam filament, and a low wire are housed inside a glass bulb, and a shield along the low beam filament is welded to the common wire. In the light bulb, the shield comprises a cup portion and a tongue portion extending upward from an upper edge of the cup portion, and a holding groove is formed at an upper portion of the tongue portion. And a flat portion formed by crushing a part of the common conductor by a plastic working method, and welding the shield by abutting the flat portion on the flat portion. 3. An automotive vehicle in which a common wire, a low beam filament, a common wire, a traveling beam filament, and a common wire are housed inside a glass bulb, and a shield along the low beam filament is welded to the common wire. In the light bulb, the shield is composed of a cup portion and a tongue portion extending upward from an upper edge of the cup portion, and a part of the tongue portion is bent toward the common conductor to form a folded piece. A light bulb for automobiles, wherein a piece is welded to a common conductor, a part of the common conductor is crushed by a plastic working method to form a flat portion, and the flat portion is welded by abutting the shield. 4. An automotive light bulb in which a common wire, a low beam filament, a low wire, a running beam filament, and a low wire are housed inside a glass bulb, and a shield is arranged along the low beam filament. The shield is composed of a cup portion and a tongue portion extending upward from an upper edge of the cup portion, and a part of the tongue portion is bent toward the common conductor to form a fold, and the fold is used as a common conductor. And the cup portion is welded to the common conductor.