JPH08250074A - Mount for bulb - Google Patents

Abstract

PURPOSE: To prevent position deviation of the filament of a bulb so that the mount for the bulb can be easily arranged in a prescribed position in a glass tube. CONSTITUTION: Of three lead wires 4, 5, 6 of a filament 9 for passing each other and a running filament 10, the lead wire 5 is positioned between the two lead wires 4, 6 positioned in both ends, to position an opposite filament side end (base end) of the lead wire 5 in an inner side from a line of connecting opposite filament side end parts of the two lead wires in both sides.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel light bulb mount. Specifically, regarding a mount in a light bulb having a lead wire in which a filament is installed between tips and a support member connecting the lead wire at an intermediate portion of these lead wires, it is easy to dispose the mount in a predetermined position in a glass tube. It is intended to provide a mount for a new light bulb.

[0002]

2. Description of the Related Art For example, there is a light bulb used as a light source for an automobile headlight, which has two filaments for a traveling beam and for a low beam.

Such a light bulb has at least three lead wires in order to have two filaments.

12 to 22 are explanatory views schematically showing the manufacturing process of such a light bulb a.

First, a glass tube b having a predetermined shape is formed.

A glass tube piece c having an appropriate length is prepared, and both ends of the glass tube piece c are held by fixing jigs d and e.

Then, the intermediate part f of the glass tube piece c is heated by a burner or the like to soften the part f (see FIG. 12), and then one fixing jig e is moved in the direction shown by the arrow in FIG. The glass tube piece c is moved so that both ends of the glass tube piece c are pulled apart. Then, the intermediate portion f softened by heating
Is stretched to have a smaller diameter, which becomes an exhaust pipe portion, and a glass tube b in which the main part g and the exhaust pipe h are integrated is formed (see FIG. 14).

Next, the mount i is formed.

Three lead wires j, k, l having different lengths
Prepare and arrange these in parallel. At this time, one ends (proximal ends) (lower ends in FIG. 15) of the lead wires j, k, and 1 on the same side are located at substantially the same position when viewed from the arrangement direction, and the longest lead wire j is on one side. , The next longest lead l is located on the other side and the shortest lead k is located between these two leads j and l (FIG. 1).
5).

Then, a glass rod melted from both sides orthogonal to the arrangement direction of the lead wires j, k, l is pressure-bonded to a portion of the lead wires j, k, l near the tip end side of the lead wires j, k, l. By sandwiching l, the glass bridge m is attached to the lead wires j, k and l (see FIG. 16).

A shade n having a boat-bottom shape is welded to the tip of the longest lead wire j, and a filament o is installed between the shade n and the tip of the second longest lead wire l. Another filament p is provided between the position of the long lead wire j closer to the base end side than the shade n and the tip of the shortest lead wire k to form the mount i (see FIG. 17).

Next, such a mount i is placed in the main part g of the glass tube b. At this time, mount i 2
First, the mount i is brought into contact with the reference plane q at the base ends of the lead wires j, k, and l so that the two filaments o and p are positioned at predetermined positions in the glass tube b. The tilt of the mount i is regulated, and then the glass tube b is covered on the mount i (see FIG. 18).

Then, a pinch-sealed portion s of the glass tube b is heated and melted by a burner flame or the like (see FIG. 19), and this portion s is provided with two pressure-bonding metal plates opposed to each other while it is still fluid. A pinch seal portion u is formed by pressure bonding with the molds t. Thereby, the lead wire j of the mount i,
A portion of k and l near the base end side is embedded and sealed in the pinch seal portion u (see FIGS. 20 and 21).

After that, after exhausting and cleaning the inside of the main part g through the exhaust pipe h, the main part g is filled with a predetermined gas or the like and the exhaust pipe h is chipped off to form the light bulb a. (See FIG. 22).

[0015]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the mount i used for manufacturing the above, the base ends of the lead wires j, k and l are positioned so as to be at substantially the same position when viewed from the arrangement direction thereof. It is difficult to improve the dimensional accuracy of j, k, and l and the positional relationship of these three with high accuracy. If these positional relationships are a little misaligned, the mount i tilts in the glass tube b, and the filaments o and p are extended. There was a problem that the position would shift.

That is, for example, when the lead wire k in the middle of the lead wires j and l on both sides protrudes toward the base end side, the base ends of the lead wires j, k and l of the mount i are set to the reference plane q. When brought into contact, the lead wire k in the middle and one lead wire j
Or, only l touches the reference plane q, and the other lead wire l or j floats from the reference plane q, the contact is unstable, and the mount i tilts with respect to the reference plane q. (See FIG. 23).

In such a state, the glass tube b is mounted on the mount i.
The filaments o and p of the mount i could not be positioned at a predetermined position inside the glass tube b (see FIG. 24) even if the mount i was covered, and the yield in the manufacturing process was deteriorated.

[0018]

In order to solve the above-mentioned problems, the mount of the light bulb of the present invention comprises a lead wire located between two lead wires located on both sides of at least three lead wires. The end on the non-filament side is positioned inside (filament side) the line connecting the ends on the non-filament side of the two lead wires on both sides.

[0019]

Therefore, according to the mount of the electric bulb of the present invention, among the three or more lead wires, the two lead wires on both sides are positioned on the inner side (filament side) of the wire connecting the ends on the non-filament side. Of the plurality of lead wires, it is relatively easy to accurately align only the ends of the two lead wires on both sides, and when manufacturing the light bulb, only the end portions of the two lead wires on both sides opposite to the filament side. If you position the with high accuracy, you can contact this to the reference surface, you can easily regulate the orientation of the mount, and the mount will not tilt with respect to the glass tube, and
The filament can be accurately positioned in the glass tube.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the mount of the light bulb of the present invention will be described below with reference to an illustrated embodiment.

The first embodiment is one in which the present invention is applied to a so-called H4 halogen bulb used as a light source of a vehicle headlamp.

1 to 11 are explanatory views schematically showing the manufacturing process of such a halogen bulb 1.

First, the glass tube 2 having a predetermined shape is formed (see FIG. 1).

Since the process of forming the glass tube 2 in which the main portion 2a and the exhaust pipe 2b are integrated is the same as the process of the above-mentioned conventional example, the description thereof will be omitted.

Next, the mount 3 is formed.

Three lead wires 4, 5 and 6 made of molybdenum having different lengths are prepared and arranged in parallel (see FIG. 2). At this time, the longest lead wire 4 is on one side (lower side), and the next longest lead wire 6 is on the other side (upper side).
And the shortest lead 5 is these two leads 4 and 6
Place it so that it is located between and.

Among the lead wires 4, 5, and 6, the longest lead wire 4 is for common, the second longest lead wire 6 is for feeding sub-filament (filament for passing beam), and the shortest lead wire 5 is used. Is for supplying power to the main filament (filament for traveling beam).

Of these lead wires 4, 5, 6
One end (base end) on the same side of the common lead wire 4 and the sub-filament power supply lead wire 6 on both sides (right end in FIG. 2)
Are arranged at substantially the same position when viewed from the arrangement direction, and the base ends of the main filament power supply lead wires 5 located between the lead wires 4 and 6 are the base ends of the lead wires 4 and 6, respectively. It should be located on the inner side (left side in FIG. 2) of the line x connecting the two. The upward direction in FIG. 2 is the upper side, and the downward direction is the lower side. In addition, the direction toward the right in the figure is the rear side (base end side), the direction toward the left is the front side (tip side), and the front side, that is, the paper side is the left side toward the figure. And the back side of the paper is the right side. In the following description, when indicating the direction, it is based on this direction.

Specifically, for example, the common lead wire 4
55 mm, the sub-filament power supply lead wire 6 is 49 mm
mm, the lead wire 5 for feeding the main filament is 42 mm
In the case of the above dimension, the proximal end of the lead wire 5 in the middle is set to be retracted inward by 0.5 mm from the other lead wires 4 and 6.

Then, a glass rod melted from both sides (paper surface side and paper spine side of the paper surface) orthogonal to the arrangement direction (vertical direction) of these lead wires 4, 5, 6 is provided on the tip side of the lead wires 4, 5, 6. The lead wires 4, 5 and 6 are sandwiched by pressing the lead wires 4, 5 and 6 by being pressed to the approached portion, so that the glass bridge 7 can lead the lead wires 4, 5 and
6 are attached so as to connect (see FIG. 3).

A substantially boat-shaped shade 8 is welded to the tip of the common lead wire 4, and a passing filament 9 is provided between the shade 8 and the tip of the sub-filament power supply lead wire 6 on the other side. And the traveling filament 10 is installed between the position of the common lead wire 4 closer to the base end side than the shade 8 and the tip of the main filament power supply lead wire 5, and the mount 3 is mounted. Formed (see FIGS. 4 and 5).

The shade 8 is made of molybdenum, and has a plate-like support piece 1 protruding forward from the upper edge of its front end.
1 is integrally formed, and a protrusion 11a extending in the left-right direction is formed on the upper surface of the support piece 11 substantially at the center in the front-rear direction.

Each of the filaments 9 and 10 is made of fine tungsten and comprises a coil portion 12 and supporting end portions 13 and 13 'protruding from both ends of the coil portion 12.

The supporting ends 13, 13 of each filament 9, 10.
Molybdenum sleeves 14, 14 are externally fitted and crimped to 13 '(see FIG. 6).

The front support end 13 of the main filament 10 is immediately after the shade 8 support of the common lead wire 4, and the rear support end 13 'is at the tip of the main filament power supply lead wire 5. , Spot welded respectively. In addition, the front support end 1 of the sub-filament 9
3 is spot-welded to the upper surface of the support piece 11 of the shade 8, and the rear-side support end portion 13 ′ is spot-welded to the front end portion of the sub-filament power supply lead wire 6.

Next, such a mount 3 is placed in the main portion 2a of the glass tube 2. First, the side opposite to the filaments 9 and 10 of the mount 3 is pressed against the reference surface so that the two filaments 9 and 10 of the mount 3 are located at predetermined positions in the glass tube 2. At this time, the base ends of the lead wires 4, 6 on both sides of each of the lead wires 4, 5, 6 come into contact with the reference surface 15 and the base ends of the lead wires 5 are in a floating state. Thereby, the inclination of the mount 3 with respect to the glass tube 2 is regulated, and then the mount 3 is covered with the glass tube 2 (see FIG. 7).

Since the base ends of the lead wires 4, 5 and 6 of the mount 3 are recessed from the other end of the lead wire 5 in the middle, only the base ends of the lead wires 4 and 6 on both sides of the reference surface 15 are retracted. When they come into contact with each other and the base ends of the lead wires 4 and 6 are pressed against the reference surface 15, the contact is made stable.

As a result, the lead wires 4 of the mount 3 are
If only the dimensions of the two lead wires 4 and 6 on both sides of the mounts 5 and 6 are produced with high precision, the mount 3 will not tilt with respect to the reference plane 15, and the filaments 9 and 10 will be inside the glass tube 2. It is regulated in place.

Then, the planned pinch-sealed portion 16 of the glass tube 2 is heated and melted by a burner flame or the like (see FIG. 8), and this portion 16 is provided with two pressure-bonding metal plates opposed to each other while it is still fluid. The pinch seal portion 18 is formed by crimping with the molds 17, 17. As a result, the portions of the lead wires 4, 5, 6 of the mount 3 which are close to the base end side are embedded and sealed in the pinch seal portion 18 (see FIGS. 9 and 10).

After that, after exhausting and cleaning the inside of the main portion 2a through the exhaust pipe 2b, the main portion 2a is filled with a predetermined gas or the like, the exhaust pipe 2b is chipped off, and the sealing portion 2c.
Thus, the halogen bulb 1 is formed (see FIG. 11).

[0041]

As is apparent from the above description, the mount of the light bulb of the present invention is composed of at least three lead wires arranged in one direction and the filament and the lead wires installed between the tips of these lead wires. A mount in a light bulb, comprising: a support member for connecting lead wires at an intermediate portion in a length direction, wherein an end portion of a lead wire located between two lead wires located on both sides on the side opposite to the filament side. It is characterized in that it is located at a position retracted from the wire connecting the base ends of two lead wires to the tip side.

Therefore, according to the mount of the light bulb of the present invention, among the three or more lead wires, the two lead wires on both sides are positioned on the inner side (filament side) of the wire connecting the ends on the non-filament side. , Out of multiple leads
It is comparatively easy to accurately align only the ends of the two lead wires on both sides, and if only the ends on the non-filament side of the two lead wires on both sides are accurately aligned when manufacturing the light bulb, The orientation of the mount can be easily regulated by bringing this into contact with the reference surface, and the mount does not tilt with respect to the glass tube, which allows the filament to be accurately positioned in the glass tube. .

In the above embodiment, the number of lead wires is three.
Although the description has been made on the book, the mount in the light bulb of the present invention is not limited to this, and can be applied to a mount provided with four or more lead wires.

The specific matters shown in the above embodiments are merely examples of the implementation of the present invention, and the technical scope of the present invention is limited by these. Must not be interpreted as.

[Brief description of drawings]

1 is a side view of a glass tube, which is for explaining in general the manufacturing steps of a light bulb to which a mount of the present invention is applied, in sequence with FIGS. 2 to 11, and FIG.

FIG. 2 is a side view showing a state in which three lead wires are arranged.

FIG. 3 is a side view showing a state in which a glass bridge is attached to a lead wire.

FIG. 4 is a side view of the mount.

FIG. 5 is a plan view of a mount.

FIG. 6 is an enlarged side view showing the tip of the mount.

FIG. 7 is a cross-sectional view showing a state where a mount is pressed against a reference surface and a glass tube is covered.

FIG. 8 is a cross-sectional view showing a state where a planned pinch seal portion is being heated.

FIG. 9 is a cross-sectional view showing a state in which pinch sealing is performed.

FIG. 10 is a cross-sectional view showing a state in which a pinch seal is made.

FIG. 11 is a side view showing a state in which a light bulb is manufactured by chip-off.

FIG. 12 is a schematic view for sequentially explaining a conventional manufacturing process of a light bulb together with FIGS. 13 to 22, and is a side view showing a state where a glass tube piece is heated.

FIG. 13 is a side view showing a state in which a glass tube piece is extended to form a main part and an exhaust pipe.

FIG. 14 is a side view showing a state in which a glass tube having a predetermined shape is formed.

FIG. 15 is a side view showing a state in which three lead wires are arranged.

FIG. 16 is a side view showing a state in which a glass bridge is attached to a lead wire.

FIG. 17 is a side view of the mount.

FIG. 18 is a cross-sectional view showing a state in which the mount is pressed against the reference surface and a glass tube is covered.

FIG. 19 is a cross-sectional view showing a state where a planned pinch seal portion is being heated.

FIG. 20 is a sectional view showing a state in which pinch sealing is performed.

FIG. 21 is a cross-sectional view showing a pinch-sealed state.

FIG. 22 is a side view showing a state in which the light bulb is manufactured by cutting off the tip.

FIG. 23 is an enlarged side view showing a conventional problem.

FIG. 24 is a side view showing a light bulb manufactured by applying a conventional mount.

[Explanation of symbols]

 1 Halogen light bulb (light bulb) 3 Mount 4 Common lead wire 5 Main filament power supply lead wire 6 Sub-filament power supply lead wire 7 Glass bridge (supporting member) 9 Passing filament 10 Running filament x Base end of two lead wires Line connecting between

Claims (1)

[Claims] 1. At least three lead wires arranged in one direction, a filament installed between the tips of these lead wires, and a support member for connecting the lead wires at an intermediate portion in the length direction of the lead wires. A mount for a light bulb, wherein the end of the lead wire located between the two lead wires located on both sides on the side opposite to the filament (hereinafter referred to as "base end") is between the base ends of the two lead wires on both sides. Mounted in a light bulb, which is located at a position retracted from the line connecting the two.