DE1254245B - Method for introducing metal into the discharge vessel of a metal vapor discharge lamp - Google Patents

Description

GERMAN JSfnWWl PATENT OFFICE

EDITORIAL

German class: 21 f - 82/02

Number: 1254 245

File number: N 27046 VIII c / 21 f

1 254 245 filing date: July 17, 1965

Opened on: November 16, 1967

The invention relates to a method for introducing a metal solid at room temperature into the Discharge vessel of a metal vapor discharge lamp, which is in a glass or metal holder with at least one outflow opening attached metal into a ventilation tube of the discharge vessel is introduced before this tube is connected to a pump and the metal by heating is transferred into the discharge vessel.

This method, which has been used for a number of years, has the disadvantage that the open Surface of the metal can form compounds that affect the quality of the discharge tube z. B. by Formation of stains, discoloration of wall parts, increase in ignition voltage, lower luminous efficiency etc. affect.

The aim of the invention is to improve this, and consists in the fact that between the one with the discharge vessel connected end of the vent tube and the metal to be inserted is a filter is attached.

The filter can consist of a hollow cylinder, one end of which passes through an apertured Transverse wall is closed.

The filter is preferably cylindrical and its length is greater than the diameter.

If the metal to be introduced is sodium, the filter is preferably made of nickel chromium.

After use, the filter can be washed, dried and used again.

The invention is explained in more detail using an exemplary embodiment shown in the drawing. In the drawing shows
1 schematically shows a discharge vessel,
F i g. 2 a filter in longitudinal section and FIG. 3 is a front view of this filter.
In Fig. 1 denotes 1 the U-shaped discharge vessel of a sodium vapor discharge lamp. The ends of the vessel are provided with schematically illustrated electrodes 2 in the usual manner, and a vent tube 3 is fused to the outside in the middle of the bend in connection with the inside of the vessel.

The vent tube 3 contains an open on both sides, filled with sodium glass tube 4, which z. B. is made in the following manner. After purification by distillation, sodium is poured into glass tubes of e.g. B. housed 1 meter length. A piece of such a tube is cut off and fed into the vent tube. The length of this piece is chosen so that there is the appropriate method for the manufacture of the discharge lamp for introducing metal into the
Discharge vessel one
Metal vapor discharge lamp

Applicant:

NV Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)

Representative:

Dipl.-Ing. H. Auer, patent attorney,
Hamburg 1, Mönckebergstr. 7th

Named as inventor:

Louis Alfons Theresia Michiels,

Emmasingel, Eindhoven (Netherlands)

Claimed priority:

Netherlands of July 22, 1964 (6 408 346)

Contains amount of sodium. This piece of pipe is briefly on the two open section surfaces of the Exposed to air.

In this method, which has already been used for years, sodium compounds such as sodium oxides, sodium hydroxides and / or sodium carbonates are formed on the unprotected cut surfaces, which are often introduced into the discharge vessel 1 during further processing.

In order to prevent sodium compounds from being introduced into the discharge vessel, according to the invention, a filter 5 is inserted into the vent tube 3 in front of the sodium metal, so that it is located in the tube 4 between the end of the vent tube connected to the discharge vessel 1 and the sodium metal to be introduced .

In the FIG. 2 and 3 illustrated embodiment, this filter is through a z. B. formed of chrome nickel existing open cylinder 5 , one end of which is closed by a transverse wall 7 provided with openings 6. The length of the open cylinder 5 is preferably greater than the outer diameter, which is approximately equal to the clear diameter of the ventilation tube 4 . In this case, the filter can be conveniently and correctly inserted into the vent tube, in which it cannot tip over.

709 688/162

Claims (5)

The thickness of the cylinder wall and the transverse wall can be approximately 1 ram, the cylinder length approximately 10 mm, the cylinder diameter approximately 6 mm and the diameter of the openings 6 approximately 1 mm. The further pumping process does not need to deviate from the previously customary, filterless process. The use of the filter fully fulfills the intended purpose. After the discharge tube has melted shut, the filter can be used again without further ado after washing with water and drying. Patent claims: 1. Method of introducing metal solid at room temperature into the discharge vessel a metal vapor discharge lamp, in a glass or metal holder with at least one outflow opening attached metal into a vent tube of the Discharge vessel is introduced before this tube is connected to a pump and the Metal is transferred into the discharge vessel by heating, thereby marked net that between the end of the vent tube connected to the discharge vessel and a filter is attached to the metal to be introduced. 2. The method according to claim 1, characterized in that the filter has the shape of an open cylinder whose length is greater than the outside diameter, which is approximately equal to the inside diameter of the vent tube is. 3. The method according to claim 2, characterized in that one end of the open cylinder is closed by a transverse wall provided with openings. 4. The method according to one or more of the preceding claims, characterized in, that the metal to be introduced is sodium and the filter is made of nickel chromium. 5. The method according to one or more of the preceding claims, characterized in, that after use the filter is washed, dried and used again. 1 sheet of drawings 709 688/162 11.67 © Bundesdmckerei Berlin