Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1998-10-16
1999-11-16
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
313117, H01J 924
Patent
active
059847514
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for producing an electric incandescent lamp in accordance with the preamble of Patent claim 1.
Prior Art
Such a method of production is disclosed, for example, in German Patent DE 22 43 717. This patent describes a two-filament halogen incandescent lamp having an anti-dazzle device and an incandescent filament arranged in the anti-dazzle device. The anti-dazzle device has a welding lug provided with a transverse rib. The incandescent filament ends are wrapped in each case in a metal foil. Here, the incandescent filament is fixed on the anti-dazzle device by fastening one of the filament ends enclosed in the metal foil to the transverse rib by a spot weld.
Description of the Invention
It is the object of the invention to provide a method for producing an electric incandescent lamp equipped with an anti-dazzle device and at least one incandescent filament, which method permits simpler fastening of the incandescent filament end to the anti-dazzle device.
This object is achieved according to the invention by the characterizing features of Patent claim 1. Particularly advantageous embodiments of the invention are described in the subclaims.
The method of production according to the invention for an electric incandescent lamp provided with at least one incandescent filament and an anti-dazzle device is distinguished in that said method has the following production steps: in the notch by melting the material of the anti-dazzle device in the region of the notch so that the melt wets the incandescent filament end arranged in the notch, and the incandescent filament end is embedded after the melt solidifies in the resolidified material of the anti-dazzle device.
By comparison with the prior art, the method of production according to the invention renders possible a simpler fastening of an incandescent filament end to the anti-dazzle device, because now at least one of the metal foils enclosing the filament ends can be saved. Fusing the incandescent filament end in a notch on the edge of the anti-dazzle device in the way according to the invention can be carried out both for uncoiled and for coiled incandescent filament ends. In order to fuse the anti-dazzle device with the incandescent filament end threaded in the notch at the edge of the anti-dazzle device, the material of the anti-dazzle device is advantageously melted on both sides of the notch. It is thereby ensured that the incandescent filament end is embedded completely in the resolidified melt of the anti-dazzle device. The anti-dazzle device is advantageously formed from a metal sheet so that it can serve as an electric supply lead for the incandescent filament connected to the anti-dazzle device. The notch at the edge of the anti-dazzle device is advantageously formed from two neighbouring projections projecting from the anti-dazzle device, which have a V-shaped or U-shaped interspace. These two exposed projections can be heated and melted with a comparatively low expenditure of energy with the aid of a laser. The method of production according to the invention is particularly suitable for producing two-filament halogen incandescent lamps which are used as a light source in motor vehicle headlamps.
DESCRIPTION OF THE PREFERRED EXEMPLARY EMBODIMENT
The invention is explained in more detail below with the aid of a preferred exemplary embodiment. In the drawing:
FIG. 1 shows an incandescent filament frame, produced in accordance with the method according to the invention, for a two-filament halogen incandescent lamp having two incandescent filaments, an anti-dazzle device and the supply leads associated therewith,
FIG. 2 shows an anti-dazzle device provided for the method of production according to the invention, and
FIG. 3 shows a two-filament halogen incandescent lamp in accordance with the prior art.
The method of production according to the invention is to be explained below with the aid of a two-filament halogen incandescent lamp, a so-called H4 lamp. The design of the H4 lamp is represented diagrammatically in
REFERENCES:
patent: 2224855 (1940-12-01), Braunsdorff
patent: 3824421 (1974-07-01), Schuringa et al.
patent: 3962596 (1976-06-01), Draper
patent: 4893050 (1990-01-01), Fields
Meyer William E.
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen MBH
Ramsey Kenneth J.
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