Electric lamp and discharge devices – With envelope – Having base and connector
Patent
1997-06-04
1999-03-30
O'Shea, Sandra
Electric lamp and discharge devices
With envelope
Having base and connector
31331801, 315 59, 362265, H01J 744, H01J 1734
Patent
active
058893601
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a discharge lamp, in particular for vehicle lighting systems.
Such a discharge lamp is known from DE 36 03 743 A1. This discharge lamp has a discharge vessel with two electrodes arranged inside. In addition, the discharge lamp has a socket made of electrically insulating material, through which electrical lines are conducted to the electrodes. Discharge lamps are commonly operated at high voltage and it has been shown that electromagnetic interference along the electrical lines to the lamp tends to occur during operation. In DE 43 10 307 it is suggested to place a filter circuit into a housing near the discharge lamp in order to prevent or at least reduce the spreading of electromagnetic interference. The filter circuit has a condenser among other things, which is connected in parallel with the electrical lines to the discharge lamp. However, this additional filter circuit represents a large expenditure and creates additional costs.
ADVANTAGES OF THE INVENTION
In contrast thereto, the discharge lamp in accordance with the invention has the advantage that with the addition of a few components a capacitively acting component is integrated into the socket of the discharge lamp, by means of which the spreading of electromagnetic interference via the electrical lines to the lamp is prevented or at least reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is shown in the drawings and is more closely explained in the following description.
FIG. 1 shows a discharge lamp in cross-section.
FIG. 2 shows the discharge lamp in cross-section along line II--II in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A discharge lamp for vehicle lighting systems, in particular for motor vehicle head lights as shown in FIGS. 1 and 2, has a discharge vessel 10 with two inward extending electrodes 12 and 13. In the exemplary embodiment shown, the electrodes 12, 13 are arranged opposite each other in the direction of the longitudinal axis 14 of the lamp. However, it is also possible to arrange the electrodes in such a way that they are situated opposite each other transversely to the longitudinal axis 14 of the lamp. The discharge vessel 10 contains a mixture of different substances which, when a voltage is applied between the electrodes 12, 13, are excited to output light. Preferably the discharge vessel 10 contains mercury under high pressure and, if desired, a metal halide, or a mixture of different metal halides. In addition, the discharge vessel can contain a rare gas, for example xenon.
An electrical line 16 or 17 which leads to a socket 20 of the discharge lamp is connected to each electrode 12, 13. The line 16 connected to the electrode 12 leading to the socket 20 is disposed approximately centrally in respect to the discharge vessel 10 and approximately parallel with the longitudinal axis 14 of the lamp, and the line 17 connected to the other electrode 13 is disposed off center and approximately parallel with the longitudinal axis 14 of the lamp. The socket 20 of the discharge lamp is made of an electrically insulating material, for example a plastic or ceramic material. A component 22 made of an electrically conductive material is connected with the end of the line 16 arranged in the socket 20, which for example is embodied as a sleeve which is round at least on its exterior, and which is disposed coaxially with the longitudinal axis 14 of the lamp. The component 22 is enveloped by the insulating material of the socket 20, at least at its exterior circumference. In the direction of the longitudinal axis 14, the component 22 has a length 1 and a radius of rl in relation to the longitudinal axis 14.
A component 26 made of an electrically conductive material is also connected with the end of the other line 17 arranged in the socket 20. The socket 20 has a widening 21 in which the end of the line 17 has been placed. The component 26 is essentially embodied in a ring shape and has a connecting piece 27, by which it is connected to th
REFERENCES:
patent: 4134042 (1979-01-01), Van Heemskerck Veeckens
patent: 5039904 (1991-08-01), Kosmatka et al.
patent: 5389856 (1995-02-01), Loijks et al.
patent: 5434763 (1995-07-01), Hege et al.
Fabry Thomas
Frey Martin
Bosch GmbH Robert
Day Michael
O'shea Sandra
Striker Michael J.
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