CS255104B1 - Production method of single-capped fluorescent tube - Google Patents

Abstract

Fluorescent lamps are made from a glass tube with a diameter of e.g. 12.5 mm, coated on the inside with a phosphor, which is divided in half lengthwise into two tubular bulbs. A glass pump tube with a diameter of e.g. 4 mm is vacuum-tightly connected to each tubular bulb by pressing the open end of the bulb. Electrode systems are vacuum-tightly sealed into the two bulbs at the same time as the pump tube. The discharge spaces of the bulbs are then connected by a vacuum-tight connection.

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a light source, a single-capped fluorescent lamp, made up of parallel glass tubes.

So far, two methods of producing single-patio fluorescent tubes from parallel glass tubes are known. The first method utilizes known manufacturing techniques for producing linear fluorescent lamps. Straight 12.5 mm diameter glass tubes with double length are covered on the inside of the luminophore. Halving the coated glass tubes yields two glass tube flasks. On two single-purpose devices, a glass leg with a 3 mm diameter pumping tube is attached to which an electrode is mounted. The glass leg with the pump tube attached is vacuum tightly connected to each glass tube. The two blanks thus produced are connected to each other by a vacuum-tight joint. The final operation is vacuum treatment of the lamp using both pump tubes.

The disadvantage of this production process is the higher energy consumption, because it is necessary to produce a foot on two dedicated machines. Furthermore, due to the small foot diameter, a glass pump tube with a maximum diameter of 3 mm can be used.

The second method uses a 12.5 mm glass tube shaped to form a narrow letter 0. The inner surface of the tube is coated with a phosphor in a manner not generally known.

Both ends of the molded tube are sealed by pressing, the electrodes with leads are sealed to both ends and the glass pump tube of diameter is also sealed to one end

3.4 mm. The final operation is a vacuum treatment, which is performed through only one pump tube.

The disadvantage of this manufacturing process is the use of only one pump tube and hence the complicated vacuum treatment. Another disadvantage is the complex manufacture of the shaped tube and difficult. covering the inner surface with a phosphor.

All of the disadvantages of the first and second known manufacturing methods are eliminated by a single-capped fluorescent lamp manufacturing method from a luminaire-coated glass tube that is divided into two tube flasks at half length and after vacuum tight sealing of the glass pump tube to each flask A joint according to the invention, characterized in that the glass pump tube is vacuum sealed to each glass tube by pressing the open end of the bulb.

The solution allows the use of larger diameter pump tubes and their connection to each flask, the use of the known simple method of covering straight tubes with luminophore and economically

a preferred method of vacuum sealing the glass bulb to the glass pump tube.

All in all, it simplifies the production process as much as possible and brings energy savings.

Fig. 1 is an example of a single-capped fluorescent lamp manufactured in accordance with the first known method with melted foot and interconnection of discharge spaces by vacuum sealing.

Fig. 2 shows an example of a single-capped fluorescent tube made according to the second known method from a straight tube bent into a U-shape, sealing both ends of the tube by pressing.

Fig. 3 shows an embodiment of a single-lamp fluorescent lamp according to the invention.

The method of manufacturing a fluorescent lamp is as follows. A straight glass tube of 12.5 mm diameter with double length covers the inside of the luminophore. After firing - sinitration - the tube ends are cleaned from luminophore up to 8 mm. On a single-purpose device, the tubes are divided in half the length. Halving the tube yields two glass tube flasks 4 coated on the inside of the luminophore. In each tube 4 on a dedicated device, in a single operation - pressing the open end of the bulb 4 - a glass pump tube 2 of 4 mm diameter is vacuum sealed and the electrode ^{28 is} sealed. The blanks thus produced are connected to each other by a vacuum-tight joint 5. The final operation is vacuum treatment of the lamp using both pump tubes 2.

Claims (1)

Method for producing a single-capped fluorescent tube of twice the length on the inside covered with a luminophore, which is divided in half into two tube flasks and after attaching the glass pump tube to each tube, the flasks are connected to each other by vacuum sealing. the glass pump connection (2) is connected by pressing the open end of the flask. ,