Electric lamp and discharge devices – With envelope – Having base and connector
Reexamination Certificate
1999-08-23
2001-07-10
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
With envelope
Having base and connector
C313S318120
Reexamination Certificate
active
06259192
ABSTRACT:
TECHNICAL FIELD
The invention relates to electric lamps and particularly to electric lamps for vehicles. More particularly the invention is concerned with the mounting structure for a vehicle lamp capsule. The invention relates to an electric lamp as described in the preamble of patent claim
1
.
BACKGROUND ART
An electric lamp of this nature has been disclosed, for example, in European laid-open specification EP 0,786,791. This document describes an electric lamp, the cap of which has a cap sleeve and a holding element which is welded thereto and in which the lamp vessel is anchored. In this case, the adjustment of the luminous means takes place in two steps, during the attachment of the lamp vessel in the holding element and during welding of the holding element to the cap sleeve.
SUMMARY OF THE INVENTION
The object of the invention is to provide an electric lamp for a headlight which allows simplified adjustment of its luminous means with respect to a reference plane of the headlight.
According to the invention, this object is achieved by means of the defining features of patent claim
1
. Particularly advantageous refinements of the invention are described in the subclaims.
The electric lamp according to the invention has a lamp cap with a lamp vessel which is anchored therein and surrounds a luminous means. According to the invention, the lamp is equipped with an adjustment ring which has at least three bearing points which are arranged in a common plane oriented perpendicularly with respect to the axis of the adjustment ring and which has at least three contact points with the lamp cap along its inner circumferential surface, the adjustment ring being fixed to the lamp cap in the at least three contact points. After the lamp has been fitted in the headlight, the at least three bearing points of the adjustment ring bear against a reference level in the reflector of the headlight. Their arrangement with respect to the luminous means therefore determines the position of the luminous means in the headlight reflector. The orientation of the bearing surface which is defined by the bearing points with respect to the luminous means is fixed by the position of the at least three contact points between the adjustment ring and the lamp cap. At the end of the adjustment process, the adjustment ring and the lamp cap are joined together at the at least three contact points. Since the orientation of the luminous means in the headlight is dependent only on the alignment of the adjustment ring with respect to the lamp cap, the lamp vessel can be anchored in the lamp cap even before the adjustment process and completely independently of this process. The abovementioned features of the lamp according to the invention therefore allow simple adjustment of the lamp in the headlight.
Advantageously, the at least three contact points between the adjustment ring and the lamp cap are formed by means of one or more projecting sections of the lamp cap. In the exemplary embodiment of the invention which is particularly preferred, the at least three contact points between adjustment ring and lamp cap are produced with the aid of an annular bead which is integrally formed on the lamp cap. The annular bead is advantageously made from plastic. In this way, it can be designed as a part which is integrally formed on the lamp cap and, in addition, increases the ability of the cap to withstand high voltages. The adjustment ring is advantageously also made from plastic. In order to allow spot welding between adjustment ring and bead by means of laser, advantageously at least one first metal part is anchored in the annular bead and at least one second metal part is anchored in the adjustment ring. Moreover, the first metal part or the second metal part to this end advantageously has a plurality of integrally formed resilient weld tabs.
REFERENCES:
patent: 5757110 (1998-05-01), Motiduki et al.
patent: 5814927 (1998-09-01), Chen
patent: 0 301 564 (1989-02-01), None
patent: 0 310 792 (1989-04-01), None
patent: 0 331 042 (1989-09-01), None
patent: 0 533 250 (1993-03-01), None
patent: 0 786 791 (1997-07-01), None
patent: 2 507 012 (1982-12-01), None
Becker Juergen
Behr Gerhard
Meyer William E.
Patel Ashok
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen MBH
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