JPH04319251A - Manufacture of incandescent lamp for automobile - Google Patents

Abstract

PURPOSE:To manufacture an automotive incandescent lamp which can be positioned with high precision against a ring for positioning a filament not only in an axial direction (Z direction) of the bulb but also in the plane (XY plane) crossing rectangularly to the axial line direction of the bulb. CONSTITUTION:In manufacture of an automotive incandescent lamp having an incandescent bulb and a connector made of a metal, an aperture 31 into which a connector 2 made of a metal is so loosely inserted as to adjust its position is formed in a positioning ring 3 and the position of the connector 2 made of a metal is changed in the aperture 31, so that positioning against the ring 3 for positioning a filament in the plane parallel to the positioning ring 3 is carried out.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an incandescent light bulb for automobiles.

0002

[Prior Art] Automotive incandescent light bulbs used in automobile headlights, fog lamps, etc. have traditionally consisted of a filament disposed perpendicularly to the axial direction of the bulb, which has a pinch seal at one end. An incandescent light bulb is known, which includes an incandescent light bulb having a shape and a metal cap that holds a pinch seal portion. A positioning ring for positioning the filament is fixed to this metal base, and this positioning ring is provided with an opening having a shape that exactly matches the cross-sectional shape of the metal base.

Conventionally, the pinch seal portion of the valve is inserted into a metal cap to which a positioning ring is fixed in advance, and the filament is positioned relative to the metal cap in the axial direction (Z direction) of the valve. The pinch seal portion is held by the pinch seal tongue piece provided on the metal cap, and then the metal cap is subjected to forcible deformation such as bending or twisting, so that the valve is aligned in the axial direction (Z direction). The filament was positioned within an orthogonal plane (XY plane).

0004

[Problems to be Solved by the Invention] However, with the means of forcibly deforming the metal cap, since the metal cap has elasticity, it returns to its original state over time, and eventually, There is a problem in that the filament is misaligned in the XY plane, making it impossible to obtain the desired light distribution.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to improve the axial direction (Z
direction) as well as the plane perpendicular to the valve axis direction (
It is an object of the present invention to provide a method for manufacturing an incandescent light bulb for an automobile, which can achieve highly accurate positioning of a filament with respect to a positioning ring even in the XY plane.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the method of manufacturing an incandescent light bulb for an automobile according to the present invention involves inserting the pinch seal portion of the bulb into a metal cap, and forming a filament in the axial direction of the bulb. Step A of holding the pinch seal part with the first tongue of the metal cap after positioning it with respect to the metal cap; and step A of holding the pinch seal part with the first tongue of the metal cap;
Step B of fixing the incandescent light bulb to the metal base by welding to the tongue piece
a step C of inserting the metal cap into the opening of the positioning ring having an opening into which the metal cap is loosely inserted and bringing the positioning ring into contact with the second tongue piece; Step D of positioning the filament with respect to the positioning ring in a plane parallel to the positioning ring by displacing the position of the metal cap at , and then welding the second tongue piece and the positioning ring. It is characterized by containing.

[0007]

[Function] The positioning ring has an opening through which the metal cap is loosely inserted, so it can be easily inserted into the plane (XY The positioning of the filament in a plane) can be achieved with high precision.

[0008]

[Examples] Examples of the present invention will be described below. 1 and 2 are a front view and a sectional view taken along line P-P of an incandescent light bulb for automobiles manufactured by the method of the present invention, FIG. 3 is a front view of an incandescent light bulb, and FIGS. 4 and 5 are a front view of an incandescent light bulb. FIG. 3 is a front view and a side view of the metal cap before attachment.

As shown in FIG. 3, a bulb 1 of an incandescent light bulb 1
1 is provided with a pinch seal portion 12 at one end thereof. A filament 13 is disposed within the bulb 11, and this filament 13 extends in a direction perpendicular to the axial direction (Z direction) of the bulb 11. In addition, in FIGS. 1 to 5, 14 is an external lead, 15 is a metal foil, and 4 is a lead wire.

As shown in FIG. 1, a pinch seal portion 12 of an incandescent light bulb 1 is held by a metal cap 2. As shown in FIG. As shown in FIGS. 4 and 5, this metal cap 2 includes a first tongue piece 21 that holds the pinch seal portion 12, a second tongue piece 22 to which the positioning ring 3 is fixed, and an external lead 14.
A third tongue piece 23 to which is welded is provided. As shown in FIG. 2, the positioning ring 3 has an opening 31 into which the metal base 2 is loosely inserted so that its position can be adjusted. Therefore, the positions of the positioning ring 3 and the filament 13 can be sufficiently adjusted within the XY plane.

Next, an embodiment of the method for manufacturing an incandescent light bulb for automobiles according to the present invention will be described with reference to FIGS. 6 to 8. Process A As shown in FIG. 6, the pinch seal part 12 of the bulb 11 is inserted into the metal cap 2, the filament 13 is positioned relative to the metal cap 2 in the axial direction (Z direction) of the bulb 11, and then the The pinch seal portion 12 is held by the first tongue piece 21 of the manufacturing mouthpiece 2.

Step B: The external lead 14 of the incandescent lamp 1 is welded to the third tongue piece 23 (see FIGS. 4 and 5) to fix the incandescent lamp 1 to the metal base 2. Step C As shown in FIG. 7, the metal cap 2 is inserted into the opening 31 of the positioning ring 3, which has an opening 31 (see FIG. 2) into which the metal cap 2 is loosely inserted, and the metal cap 2 is inserted into the second tongue piece 22. The positioning ring 3 is brought into contact.

Step D As shown in FIG. 8, the opening 31 of the positioning ring 3
The position of the metal base 2 in the X direction, Y direction and θ
By displacing the filament 13 in the direction (rotation), the filament 13 is positioned relative to the positioning ring 3 in a plane (XY plane) parallel to the positioning ring 3, and then the second tongue piece 22 and the positioning ring 3 are welded. do. θ
By displacing the filament 13 in the direction, the positional displacement caused by the twisting of the filament 13 can also be adjusted.

[0014] In the above embodiment, the order of process A, process B, process C, and process D was taken, but in the present invention, the timing at which the metal cap 2 is inserted into the positioning ring 3 is not limited to the above embodiment. . For example, after the metal cap 2 is inserted into the opening 31 of the positioning ring 3, the pinch seal portion 12 of the incandescent light bulb 1 may be inserted into the metal cap 2 and fixed. That is, after step C is performed first, step A, step B, and step D may be performed in this order. Further, in FIG. 1, the second tongue piece 22 is welded to the upper surface of the positioning ring 3, but the second tongue piece 22 may be welded to the lower surface of the positioning ring 3.

[0015]

[Effects of the Invention] As explained above, according to the present invention,
Manufacture of an incandescent light bulb for automobiles in which the filament can be positioned with respect to a positioning ring with high precision not only in the axial direction of the bulb (Z direction) but also in a plane perpendicular to the axial direction of the bulb (XY plane) method can be provided.

[Brief explanation of drawings]

FIG. 1 is a front view showing an automotive incandescent light bulb manufactured by the method of the present invention.

FIG. 2 is a cross-sectional view taken along line PP in FIG. 1;

FIG. 3 is a front view of an incandescent light bulb.

FIG. 4 is a front view of the metal base before an incandescent light bulb is attached.

FIG. 5 is a side view of the metal base before the incandescent light bulb is attached.

FIG. 6 is an explanatory diagram showing Step A and Step B of an example of the manufacturing method according to the present invention.

FIG. 7 is an explanatory diagram showing step C of an embodiment of the manufacturing method according to the present invention.

FIG. 8 is an explanatory diagram showing step D of an embodiment of the manufacturing method according to the present invention.

[Explanation of symbols]

1 Incandescent light bulb
11 Valve 12 Pinch seal part
13 Filament 14 External lead
15 Metal foil 2 Metal cap
21 First tongue piece 22 Second tongue piece 23
Third tongue piece 3 Positioning ring
31 Opening 4 Lead wire

Claims (1)

[Claims] [Claim 1] The pinch seal portion of the bulb is inserted into the metal cap, the filament is positioned relative to the metal cap in the axial direction of the bulb, and the pinch seal portion is held by the first tongue piece of the metal cap. Step A: welding the external lead of the incandescent light bulb to the third tongue piece to fix the incandescent light bulb to the metal base; and step B: fixing the incandescent light bulb to the metal base by welding the external lead of the incandescent light bulb to the third tongue piece; Step C of inserting the metal cap and bringing the positioning ring into contact with the second tongue piece, and displacing the position of the metal cap within the opening of the positioning ring in a plane parallel to the positioning ring. A method for manufacturing an incandescent light bulb for an automobile, comprising a step D of positioning the filament with respect to the positioning ring and then welding the second tongue piece and the positioning ring.