JPS6342815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp which is supplied with power from an AC distribution line through a rectifier, and in particular, to a discharge lamp which is powered by an AC power distribution line through a rectifier, and in particular, a discharge lamp having two electrodes (herein, these two electrodes are arranged adjacently and separated from each other by a separating member). (collectively referred to as a double electrode) and a transverse connection portion that connects the adjacent space (herein referred to as an electrode chamber) in which the individual electrodes are located in a state that interrupts discharge. Regarding.

By means of a directly operated discharge lamp, the transverse connection is formed in the form of an annular gap between a cylindrical tube and a cylindrical body inserted into this tube and closed on at least one side. Double-electrode discharge lamps are already known which have a transverse connection that connects the chambers in a discharge-blocking manner. Thereby, by interconnecting the two electrode chambers by a duct of sufficiently small cross section, it is possible that no electrical gas discharge takes place in this duct, but as a result of pressure differences and/or
Alternatively, a flow of metal vapor or gas molecules could be generated through this duct by diffusion. As a result, depletion of the anode area, so-called electrophoresis, which is disadvantageous for light generation, for example in mercury ions, is prevented during direct current lighting (DE-A-225-4709).

Furthermore, in order to form a gas discharge lamp for direct current lighting that operates without electrophoresis, the transverse connection connecting the electrode chambers to which the electrical starting direct current voltage and the starting direct current voltage are applied is provided with a barrier, preferably made of glass. It is known to form a capillary tube passing through the barrier and to provide electrodes close to each other at a small distance on both sides of the barrier in order to avoid zones of no discharge in the area of the capillary tube (German Patent Application No. No. 2319401).

For DC lighting of gas discharge lamp from AC power supply,
A supply circuit arrangement in the form of a voltage multiplier circuit consisting of rectifier diodes and capacitors and a low-power starting circuit supplying a high voltage into one multiplier circuit consisting of several voltage multiplier stages connected in series. The integrated circuit arrangement is known (West German patent specification no.
No. 1639108).

Devices for supplying gas discharge lamps from an alternating current distribution line with a rectifier in the form of a voltage multiplier circuit with a choke, through which the lighting current flows, are also known, in which case the iron core of the choke has an internal cavity. have,
The internal cavity accommodates the structural elements of the rectifier (German Patent Specification No. 2133669).

Rectangular fluorescent lamps with a glass tube formed in one piece from a U-shaped end tube and long tubes on both sides, two electrodes and a transverse connection of the electrode chamber are known.
(U.S. Pat. No. 3,117,248), in which the legs on both sides of the U-shaped tube extend in a straight line, and the electrodes are formed separately to form the U-shaped tube.
Each is placed in a bent tube leg. A plurality of narrow tubes are provided between the straight tube ends, and the narrow tubes are integrally formed with the legs of the tubes.

Such fluorescent lights are not suitable for mass production, since welding the connecting tubes is time-consuming and difficult, and can only be carried out by hand.
The disadvantage is that the thin tube often breaks when creating a vacuum in the gas discharge lamp.

It is an object of the present invention to utilize these known devices and structural principles to create a discharge lamp that has increased light efficiency compared to known fluorescent tubes and that can be easily manufactured by mass production. do.

This problem is solved in a discharge lamp of the type mentioned at the beginning, in which, according to the present invention, a discharge tube is formed in a rectangular shape with a gap formed in one place, and the discharge lamp is inserted into the gap and connected to the tube end of the discharge tube. a structural element, the structural element having a glass tube piece having approximately the same diameter and wall thickness as the tube end, and a conductor fixed to the glass tube piece through the glass tube piece; a partition wall fixed between the electrodes in the glass tube piece, and at least one intake and exhaust pipe inserted in the glass tube piece, for starting and lighting. The ballast is solved in that its two DC high voltage terminals are connected to the electrodes via the conductors and the two low voltage connections are connected to the AC distribution line via further conductors.

With the embodiment according to the invention, the length of the discharge path is almost doubled, although the structural length remains essentially the same. This results in cathode drop.
This means that the ratio between the loss voltage generated at the electrodes, which is exchanged for heat rather than light, and the operating voltage is greatly improved. Furthermore, the tube cross section can be selected to be relatively small, so that the high operating voltage of approximately 300 volts can be utilized optimally.

According to an embodiment of the present invention, which is suitable for large volume production using automatic glass tube bending and melting machines, the rectangular shape is manufactured by bending a long straight tube, i.e. with a U-shaped end. The tube is formed in one piece with a long straight section, with the straight open free tube ends each bent into a quarter arc to allow mercury vapor permeation into the gap between the two quarter arcs. A prefabricated structural element having a conductive but discharge-blocking septum and an electrode is placed and connected to the open end of the bent tube.

Preferably, partition walls made of sintered gasular fibers are used.

It is particularly advantageous if the electrode support is connected to an instant-start oxide electrode, ie an electron-dischargeable oxide-coated electrode.

at least one in the structural element between both tube ends
It is reasonable to have several intake and exhaust pipes.

In a preferred embodiment of the invention, a main connector for starting and lighting is arranged in the rectangular inner chamber for connection to the cross-over distribution line, for example according to DE 1639108, i.e. to supply the high DC voltage of the main connector. The electrode connections provided are electrically insulated and the intake or exhaust pipes are mechanically protected and covered, and only two low-voltage connection lines are led out for connection to the conventional AC distribution line.

The narrow side can be provided with a terminal consisting of a pair of pins known for use in arc tubes for connection to the distribution line.

According to a variant of the invention, it is also possible to provide an Edison socket as the distribution line connection.

The invention also encompasses a method for the production of such a discharge lamp, which is supplied via a rectifier from an alternating current distribution line, with a discharge-blocking cross-connection connecting the electrode and the space in which the electrode is provided.

According to the manufacturing method according to the invention, a straight tube is first bent into an elongated U-shape, and then the still straight, free and open tube ends are each transformed into a quarter arc,
Into the intermediate space formed by the gap between the quarter arcs the previously produced structural element is inserted tightly and subsequently connected to the tube end by glass melting.

Advantageously, the straight pipe is coated with luminescent material before the bending process.

The invention will be explained in more detail below by means of exemplary embodiments illustrated diagrammatically in the drawings.

1 to 4, a straight pipe 1 indicated by a dashed line in FIG. 1 has been drawn out using a known automatic machine for mass production and has already been preferentially coated with a luminescent material.
is bent on an automatic machine to the desired dimensions, such as length and spacing, into an elongated U-shape as shown in solid line in FIG. Simultaneously or in conjunction with a subsequent bending process, the straight tube ends 2, 3 are each
It is transformed into a four-circle arc, and the ends 2 and 3 face each other at a predetermined distance 4. In a further working step, the anti-electrophoretic structural element 6 shown in FIGS. 2 and 3 is inserted into the intermediate space created by the spacing 4 and subsequently the tube ends 2 and 3 are connected to the glass. The bonding is carried out using melting technology, preferably in special automatic machines. The structural element 6 is shown in partial section or in front view in FIGS. 2 and 3. Inside the glass tube piece 7, which has a length approximately corresponding to the distance 4 between the bent tube ends 2 and 3 and whose diameter and wall thickness are approximately equal to those of the tube ends 2 and 3, there is a glass tube piece 7 which blocks the discharge. However, a partition 8 is arranged which is permeable to metal vapors and consists of, for example, sintered glass fibers. There are two electrodes 9 and 1 on each side of the separator 8.
0 is provided with an instant-start oxide electrode, an electron-discharging oxide-deposited electrode, which is preferably heated by the actuation current itself. Furthermore, two intake and exhaust pipes 11 and 12, each associated with a tube end 2 or 3, are inserted into the glass tube piece 7. Finally, in the glass tube 7 conductors 13 and 14 are fixed to the electrodes 9 and 10. Conductive wires 13 and 14 inserted and fixed into the glass tube 7 support electrodes 9 and 10, respectively.

In FIG. 4, a discharge tube 1 is mechanically closed approximately in an O-shape, with a glass tube piece 7 forming part of a structural element 6 to which the completed discharge lamp is welded.
5, in which case a rectifier ballast 16 is arranged in the O-shaped intermediate chamber between the discharge tubes, the connection to the distribution line being in the illustrated example an ordinary Edison socket. 17. In this arrangement, the rectifier ballast 16 is preferably shaped like a rod with a circular cross section and a light reflective surface.

In FIG. 4, an insulating canopy 18 is formed in a circular shape, and the electrode connection portion is covered so as to be appropriately electrically insulated for contact protection, and the intake and exhaust pipe 1
1 and 12 are constructed in such a way that they are protected from mechanical damage.

In accordance with the illustrated embodiment, the fluorescent lamp of the present invention comprises a pair of pin-shaped pins of a conventional fluorescent lamp electrically connected to power terminals 19, 20 on the narrow side of the rectangular or O-shaped light arrangement. If the socket terminal is fixed, it can also be inserted into an existing illuminator as an alternative to a regular direct alternating current lit bar type fluorescent lamp with pin socket terminals on both sides. In this case, a conventional glow starter can be dispensed with, and just as easily a conventional ballast can be dispensed with.

Due to its relatively small dimensions, the antielectrophoretic structural element 6 with the electrode support according to FIG. It can also be inserted as a connecting member between the beginning and the end of such an array in an array. The shape of the ballast is then adapted to the respective arrangement.

The illustrated elongated O-shape in the embodiments according to FIGS. 1 to 4 can also be constructed from two straight tubes with ends bent at right angles on both sides. At that time, position 21 in Figure 1 or Figure 4
A fused joint is created at. This can be done automatically and simultaneously with the welding of the glass tube 7 into the space 4.

The invention is not restricted to the illustrated and described embodiments, but encompasses all technical variations and developments as well as all combinations of the described and/or illustrated features and measures.

[Brief explanation of drawings]

FIG. 1 shows an intermediate manufacturing stage of a discharge lamp according to the present invention.
Figure 2 shows structural elements that can be used in connection with the curved tube according to Figure 1, Figure 3 is a front view of the section according to Figure 2, and Figure 4 is a partial section of the completed discharge lamp with an Edison socket. FIG. 2, 3...Pipe end, 1...Straight pipe, 4...Space,
6... Structural element, 7... Glass tube piece, 8... Partition wall, 9, 10... Electrode, 11, 12... Intake/exhaust pipe, 13, 14... Conductor, 16... Ballast, 17
...Edison socket, 19,20...Low voltage connection.

Claims (1)

[Scope of Claims] 1. A discharge tube 15 formed in a rectangular shape and having a gap 4 formed at one location, and a structural element inserted into the gap 4 and connected to the tube ends 2 and 3 of the discharge tube 15. 6, the structural element comprises a glass tube piece 7 having approximately the same diameter and wall thickness as the tube ends 2, 3, and conductors 13, 14 fixed through the glass tube piece.
two electrodes 9 and 10 respectively held in the glass tube piece 7; and a partition wall 8 fixed between the electrodes 9 and 10 in the glass tube piece 7 and having a discharge-blocking shape but permeable to mercury vapor. and at least one intake/exhaust pipe 11, 12 inserted into the glass tube piece 7, and a starting and lighting ballast 16 disposed in the intermediate chamber of the rectangular discharge tube supplies the two DC currents. A high voltage terminal is connected to the electrodes 9, 10 via the conductive wires 13, 14, and two low voltage connections 1
9 and 20 are connected to an AC power distribution line via separate conducting wires. 2. The discharge lamp according to claim 1, characterized in that a pair of pin-shaped terminals are provided near the structural element 6 as a power distribution line connection part. 3. The discharge lamp according to claim 1, characterized in that one Edison socket 17 is attached to the discharge tube 15 as a power distribution line connection part. 4. The straight pipe is first bent into an elongated U-shape, and then the still straight open free pipe ends are each transformed into one quarter arc, with an intermediate space formed in the gap between the quarter arcs. , a glass tube piece 7 having approximately the same diameter and wall thickness as said free tube ends 2, 3, two electrodes 9, 10 held within said glass tube piece 7, and a pair of electrodes 9, 10 held within said glass tube piece 7; A structural element comprising a partition wall 8 fixed therebetween and at least one intake/exhaust pipe 11, 12 inserted into the glass tube piece 7 is tightly inserted and connected to the tube end by glass melting. A method for manufacturing a discharge lamp. 4 One end of each of two straight pipes with both ends bent at right angles is melt-bonded to each other, and a pipe having approximately the same diameter and wall thickness as the pipe end is placed in the gap between the other end. A certain glass tube piece 7, two electrodes 9, 10 held within the glass tube piece 7, a partition wall 8 fixed between the electrodes 9, 10, and at least one glass tube piece 7 inserted into the glass tube piece 7. A method of manufacturing a discharge lamp, characterized in that a structural element comprising intake and exhaust pipes 11 and 12 is tightly inserted and connected to the end of the pipe by glass melting.