JPS60254551A - Halogen lamp for headlamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a halogen pulp installed in a shield type headlamp.

[Background of the invention]

FIG. 1 is a sectional view showing a conventional example of this type of Rodan valve 9.

The halogen bulb 1 is airtightly fitted into a cylindrical mounting portion 2a provided at the rear of the reflector 2 via an O-ring 2a-1. This Norogen bulb 1 has a pinch seal part 1a formed at the rear of the glass tube, and this pinch seal part 1a is exposed into a cylindrical holder lb, and heat-resistant cement io is filled and solidified therein. 1d is a lid-like member provided with an opening 1d-1 larger than the pinch seal portion 1a.

The conventional NO-ROGEN valve mentioned above has a structure in which the glass tube part is fixedly supported using heat-resistant cement, so a special device is required to harden the heat-resistant cement, and the assembly process is slow. Since it takes time to harden in the middle of the process, it has to be left alone during that time, which poses a problem of extremely poor workability. .

In addition, heat-resistant cement absorbs moisture from the atmosphere after hardening and is affected by humidity, so if the assembled halogen bulb is attached to the lamp as is, spiders will form inside the lamp chamber when the halogen pulp is lit. There is also the inconvenience.

In order to eliminate the troubles caused by heat-resistant cement as described above, for example, the lid-like member 1d in the conventional example shown in FIG. 1 is fixed to the holder lb, and the opening 1d of the lid-like member is
-1 and the pinch seal portion 1a may be tightly fitted to firmly support the glass tube portion without using heat-resistant cement. However, if the glass tube part is fixedly supported by a rigid member as in the above-mentioned proposal, it is difficult to adjust the filament ()e sealed in the glass tube part so that it is at a predetermined position with respect to the holder 1b. be.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and provides a halogen pulp for a headlamp that can fixedly support a glass tube part in a predetermined position with respect to a holder without using heat-resistant cement. This is what I am trying to do.

[Summary of the invention]

In order to achieve the above object, the halogen bulb d of the present invention,
A metal cylindrical base is fitted into a resin cylindrical holder,
On the other hand, a cylindrical metal adapter is provided with a flange having an outer diameter smaller than the inner diameter of the cylindrical base, and is fitted to the pinch seal portion of the pulp. A part of the cylindrical adapter is folded up almost parallel to the central axis to form a protruding piece, and the flange with the above protruding piece is fitted into the cylindrical base within the range of the fit. It is characterized in that the filaments of the pulp are aligned and the protruding piece and the cylindrical base are fixed to each other by plasma welding.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described with reference to FIGS. 2 to 4.

A pinch seal part 1a, a cylindrical holder lb, which has the same drawing reference number as the conventional halogen pulp (Fig. 1),
The filament le and the reflector 2 are the same or similar components as in conventional halogen pulp.

FIG. 2 is a cross-sectional view of the headlamp bulb constructed to which the present invention is applied, in which each component is temporarily assembled. FIG. 3 is an exploded perspective view of the above embodiment.

A metal cylindrical base member 3 is constructed and fitted into a resin cylindrical holder lb.

An adapter 4 is configured to connect the no-pace member 3 and the pinch seal portion 1a. This adapter 4 includes a cylindrical main body portion 4a that fits onto the pinch seal portion 1a, and a flange 4.
It is a metal member that is integrally connected with b. The adapter 4 of this embodiment is formed into a two-piece shape by press-molding a metal plate, and has a structure in which the pinch seal portion 1a is partially located and fixed in the cylindrical main body portion 4a.

When carrying out the present invention, the adapter cylindrical main body portion 4a may be made of a metal material into an integral rectangular tube shape and may be crimped to the pinch seal portion 1a.

Fold up the four peripheral parts of the flange 4b upward (more specifically, parallel to the central axis of the cylindrical part 4a) to form a projecting piece 4b-1.
Configure.

The flange 4b has a projection 4b formed around it.
The outer diameter φ including 1 is configured to be smaller than the inner diameter φ2 of the cylindrical base 3. In this example, the gap g (i.e., φ2
-φI/2) is set to 0.2. When carrying out the present invention, the above gap dimension g is set to 0.3 MTn
It is desirable to keep it at or below that.

FIG. 4 is a perspective view of a state in which the flange 4b is fitted into the cylindrical base 3 after being temporarily assembled as shown in FIG. 2.

In the temporarily assembled state (FIG. 2), the glass tubular portion 1f of the pulp is moved appropriately so that the filament (le) is at a predetermined position with respect to the cylindrical holder 1b.

With the position of the filament (le) adjusted as described above, the base member 3 and the protruding piece 4b-1 are fixed to each other by plasma welding, and the position of the adapter 4 in the adjusted state is fixed. As a result, the glass tubular portion 1f is placed in the holder 1 with the filament 1e correctly positioned.
fixed relative to b.

The fixation by plasma welding described above can be easily performed using known techniques. Plasma welding allows for easy local heating, so there is no adverse thermal effect on the resin boulder 1b. 5 and 6 show a different embodiment from the above, and the cylindrical main body 4& of the adapter 4' of this embodiment is the same component as in the previous example. Flange 4b' of adapter 4' of this example
A pair of protruding pieces 4b'-1 are formed around the protruding pieces 4b'-1.

In this example as well, the glass tubular portion 1f can be correctly positioned and fixed to the holder 1b in the same way as in the previous example.

Each of the above-mentioned embodiments has a structure in which the glass tube part of the pulp is supported without using heat-resistant cement, so there is no time loss for waiting for the hardening of the heat-resistant cement, and the lamp room is equipped with heat-resistant cement. There is no risk of clouding forming inside. Furthermore, the position of the filament provided in the glass tube portion can be easily adjusted, and the adjusted position can be fixed, so that the filament can be positioned accurately in a predetermined position.

〔Effect of the invention〕

As detailed above, the halogen bulb of the present invention supports the glass tube portion without using heat-resistant cement, so there is no risk of trouble caused by heat-resistant cement, and in addition, the filament position can be adjusted correctly. This provides an excellent practical effect in that the glass tube portion can be quickly and easily fixed to the holder.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of conventional halogen pulp. FIG. 2 is a cross-sectional view of one embodiment of the halogen bulb of the present invention in a temporarily assembled state, FIG. 3 is an exploded perspective view of the above embodiment, and FIG. 4 is a perspective view of the above embodiment in a temporarily assembled state. FIG. 5 is an exploded perspective view of an embodiment different from the above, and FIG. 6 is a perspective view of the same temporarily assembled state. 1°...Halogen bulb, 1a...Pinch seal part,
1b°゛°cylindrical holder, IC...heat-resistant cement, 1
d... Lid-shaped member, Id-1... Opening, 1e... Filament, 3... Metal cylindrical pace member, 4,
4'... Adapter, 4a... Cylindrical main body, 4b.
...Flange, 4b-1...projection piece. Figure 1 Figure 2 Figure 3 Figure 4 Figure B Figure 5

Claims (1)

[Claims] A metal cylindrical paste is fitted into a resin cylindrical holder,
On the other hand, a cylindrical metal adapter is provided with a flange having an outer diameter smaller than the inner diameter of the cylindrical pace, and is fitted to the pinch seal portion of the pulp. At least a portion of the cylindrical adapter is folded up almost parallel to the central axis to form a protruding piece, and the above-mentioned protruding piece is formed, and the flange is fitted into the cylindrical space within the range of play during fitting. A halogen pulp for a headlamp, characterized in that filaments of the pulp are aligned within the pulp, and the protruding piece and the cylindrical paste are fixed to each other by plasma welding.