Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1998-10-19
2000-06-06
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
H01J 932
Patent
active
060711647
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for producing a high-pressure discharge lamp in accordance with the preamble of patent claim 1.
PRIOR ART
Such a production method is disclosed, for example, in the international patent application PCT/DE94/00600. Said patent application describes a high-pressure discharge lamp with a base at one end, and a production method for a high-pressure discharge lamp with a base at one end, which has a discharge vessel which is sealed at two ends and in which there is an enclosed ionizable filling, and in which two electrodes are arranged, the end of the discharge vessel on the base side having a tubular extension in which the base-side supply lead runs. This base-side supply lead is sealed in a gastight fashion in the base-side end of the discharge vessel. It connects the base-side lamp electrode to the corresponding base contact. The interspace between the base-side supply lead and the inner wall of the tubular extension is empty here, that is to say filled with air. Normally, the high-pressure discharge lamp is fed the starting voltage required to start it via the base-side supply lead for reasons of safety, while the current return path, which is remote from the base and connected to the electrode, which is remote from the base, is at frame potential. It has emerged that the electric insulation of the base-side supply lead running in the tubular extension of the base-side end of the discharge vessel is not sufficient in every case.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a method for producing a high-pressure discharge lamp having an improved electric insulation of the supply leads projecting from the discharge vessel and running in the tubular extension of the end of the discharge vessel.
This object is achieved according to the invention by means of the characterizing features of patent claim 1. Particularly advantageous designs of the invention are described in the subclaims.
In the course of the production method according to the invention, a prefabricated discharge vessel is provided in which there is an enclosed ionizable filling and in which electrodes are arranged, and which has at least one sealed end and at least one supply lead projecting from said sealed end, the at least one sealed end of the discharge vessel having a tubular extension which is open at one end and in which the at least one supply lead runs. According to the invention, the production method according to the invention includes the two following additional fabrication steps: between the at least one supply lead and the tubular extension is filled up with glass shot, and
The electric insulation of the at least one supply lead running in the tubular extension is improved by means of these measures according to the invention. In order to ensure that the tubular extension is filled up uniformly with glass shot, the glass shot is advantageously compacted by means of a vibrator after being filled into the tubular extension and before the tubular extension is sealed. The glass shot advantageously comprises glass beads or glass particles whose diameter or particle size is not more than 0.3 mm and, in particular, is advantageously between 0.03 mm and 0.15 mm. It is possible as a result for the interspace between the at least one supply lead running in the tubular extension and the inner wall of the tubular extension to be filled up optimally. It is advantageous to use as glass shot material soft glass or hard glass which has a sufficient heat resistance and is an excellent electric insulator. By contrast with soft glass, the use of hard glass has the advantage that the coefficient of thermal expansion of the hard glass is closer to the coefficient of thermal expansion of the silica glass of the tubular extension of the discharge vessel than that of the soft glass, with the result that there is less of a tendency for cracks or flaws to form in the tubular extension. The glass particles are advantageously heated at the surface of the glass shot filling in order to seal the tu
REFERENCES:
patent: 5252888 (1993-10-01), Topel et al.
patent: 5432399 (1995-07-01), Nagasawa et al.
patent: 5772487 (1998-06-01), Lee
McNeill William H.
Patent-Truehand-Gesellschaft fuer Electrische Gluelampen mbH
Ramsey Kenneth J.
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