DE1012688B - Electric high pressure gas discharge lamp - Google Patents

Description

In electric discharge lamps it has already been proposed to stabilize the discharge or to use the influence of magnetic fields for the purpose of shifting the arc to a certain point. Usually external permanent magnets or electromagnets were used. Partly has the conductors that bring the current to the discharge are also used, as their own magnetic field may already have a sufficient size under certain circumstances.

The last-mentioned idea can be particularly successful in the case of electric high-pressure gas discharge lamps be realized, especially in the case of discharge lamps with krypton and / or xenon filling from one several, up to 100 atm. amount of pressure, because of the low gradient of this High pressure gas discharge determines the operating currents and thus those arising in a simple conductor Magnetic fields already have a noteworthy strength. The invention is based on a high-pressure vapor discharge lamp known form, in which the power supply lines to both main electrodes are connected to the same Side of the discharge vessel are introduced into this vacuum-tight. The power supply to the The electrode remote from the base is then arranged within the discharge vessel. Accordingly, they are Power supply lines to the operating electrodes only at one point where the ignition of the discharge is initiated is closely approached to one another, but far from one another at the ends carrying the operating electrodes removed. The invention consists in that this power supply consists of a poorly electron-emitting, There are conductive material or are coated with it and also a sufficient material thickness have, so that the formation of a glow spot is hindered, and that these power supply lines such are performed that the arc is under the influence of the magnetic field of the current flowing through each Sections slowly moves along the power supply lines to the operating electrodes. Of course, in contrast to what is known, in this case there are no insulating coatings on the power supply lines intended.

The fact that the arc is given the opportunity to be closely approximated between each other Power lines to 7Ainden, with an auxiliary ignition electrode possibly also being arranged at this point the required ignition voltage is relatively low. This is important because with high pressure gas discharge lamps Because of the high pressure already present in the cold state, the ignition voltage is generally very high and of course all the higher, the greater the distance to be passed over by the arc for the first time. Due to the special shape Electric high pressure gas discharge lamp

Applicant:

Patent trust company

for electric light bulbs m.b.H., Munich 2, Windenmacherstr. 6th

Dr. Paul Schulz, Karlsruhe (Bad.),

and Dipl.-Ing. Dr. Arnold Bauer, Augsburg,

have been named as inventors

of the power supply lines according to the invention, however, the arc does not remain at this point of the initial ignition. stand, but is forced to run along the power supply lines to the end parts, which are significantly further apart, which act as electrodes serve or wear special electrodes. The risk of the arc stopping at the Intermediate parts of the power supply lines are countered by measures known per se, which prevent or complicate the formation of a glow spot, So above all by sufficiently large, the heat dissipating cross-section of the power supply lines as well through appropriate selection of the material used for this or through special coatings, for what accordingly, materials are used that emit electrons poorly. This would come in addition to the high-melting ones Metals such as tungsten or tantalum, especially zirconium, are possible.

You can make the arrangement of the power supply lines so that the migration of the arc from the Ignition point up to the operating electrodes due to the convection currents that start with the formation of the arc is supported, but at least does not have to run counter to it. So it is useful the approximated sections of the power supply lines where the ignition takes place, next to or below of the operating electrodes. The arc then only needs to be horizontal or upwards to hike.

The drawing shows some embodiments of the invention, namely is

1 shows the view of a high-pressure gas discharge lamp for vertical burning position;

Fig. 2 is a cross section taken along line 2-2 in Fig. 1; Fig. 3 is the cross-section through a similar something

modified exemplary embodiment. High pressure gas

709 589/220

Claims (8)

3 4 Discharge lamps for the horizontal burning position that strives for; will be annulled. This makes it possible to force balance invention into right arcs up to a few mm in length in more stable FIGS. conditions with vertically burning arches is possible. f .. _{l | r} The high-pressure gas discharge lamp according to FIG. 1, the 5 In non-wall-stabilized high-pressure discharge: | with krypton and / or xenon from about 3 to 10 atm. Up to now, lamps with a noble gas filling were lamp-like. ■ «Cold pressure is filled, a vessel made of quartz or voltage over 30 to 40 volts because of the low Λ ^ * high melting glass has a 1. gradient and for reasons of stability a few mm || Through the foot 2, power supply wires 3, 4, 5 cannot be reached if the arc length does not exceed *. 't passed through vacuum-tight. They carry Fig 10 in the interior 5, shows how to reach or zwischengeschal- ignition and stabilization of the vessel, the electrode Il to a long sheet of the invention, '· - ■'. ■ ended current leads. At the power supply 3 can. ■ C,, ■: «" sits the power supply line 6, the end 7 of which is used as an operating electrode between the operating electrodes 7 and% \ t , while at the power supply line 5 the burning arc is caused by the magnetic field of the other power line 8 an upwardly directed force is seated on the end 9 serving as operating electrode 15 power supply line 6 sieve .bekanni || r · ■ - and 8 closely approximated each other, in contrast to the way (as Fig. 6 shows in section) the arc wet, '.% t much greater distance between the ends 7 is pressed down. According to the invention it can be ■ ..: £ and 9. The approximated parts 10 and 11 enable 20 to find a balance so that the arc in the f! an easy ignition with a relatively small tube axis burns stably and an overload, dgr \; Voltage, which is also avoided in support of this upper zone of the lamp bulb l) between'elS | : '■ Place an auxiliary electrode 12 can be arranged, the higher load than possible with wall stabilization, '<= seated on the power supply 4. After the ignition of the will. The parallel conductors 18 are on, ■■■ ·: * The arc between points 10 and 11 moves 25 a cylinder jacket around the arc as an axis |, this is arranged under the effect of the inherent magnetic fields. Such a circular cross-section " ^! ,%. parts of the power supply line through which current flows. The arrangement of the conductors 18 (Fig. 6) is important "dßit -" '·' "- '* f» and 8 along these until the end of the arc is reached. A * '■ | parts 7 and 9. In the present example, this is just such a trough-shaped magnetic field leaves '· ■ ' - ■. : ■ '· Migration still through the upwardly directed con - 30 also through an electric- '* formed according to FIG. vection currents supported. magnets 19 with elongated pole pieces 20 he '■ "* § ■ In the embodiment just described, testify. The coil through which the lamp flows ■ ¹ 2l! F If the arrangement between the power supply lines is 6.8 fewer turns create an even, -der ':::. £, and the lamp vessel 1 taken so that the final arc length corresponding, indicated by the arrows ait ^; r « parts 7 and 9 in one of a bulge 13 of the 35 interpreted magnetic field. Fig: 8 shows in section the '. § Vessel formed channel are, which the arc position of the pole pieces 20 opposite lamp bulb 1 _; ; , limited on one side. This achieves that the and arches 17, so that the luminous flux of the arch £ as little as possible is absorbed by the electrodes and the discharge. . ';: Blackening of the lamp vessel primarily by using auxiliary electrode 12 (FIG. 5) supplied r ^~: ■>: along this channel and possibly in the crest 14 of the ₄₀ high voltage, the arc between the one another '} The vessel settles, while the opposite, i.e. the approximate parts 10, II of the power supply lines 6.8 ''. The wall part lying further away from it remains ignited. The ignition at this point can also be used in. .. # and therefore the emission of light or, as is known per se, by opening an igniting - * If necessary, also adjacent invisible rays in contact with bimetal strips or magnetic ΐ is not diminished in the course of its service life. 45 means or by direct ignition via the hood ""; ■ Electrodes can be used to further support this effect. The approach of the arch to dar ^ below the dome 14 of the lamp vessel another power supply line 6 at 10 (Fig. 5) is through the b |> *! ■ semicircular screen 15, which forced the written mechanism, to the Streng ' Convection currents influenced accordingly. supply line 6 to the top or the main telejp-> The channel 13 does not have to run _{forward as a bulge of the 50} trode 7. For this purpose, the upper magnetic field f Be formed lamp vessel itself, but can be switched off by switch 22, if necessary i a 'special, for example made of quartz or heavy with partial short-circuiting of the choke 23 (V ^ -. νΐ, / ·;) fusible ceramic built-in part 16 enlargement of the current and thereby the magnetic field), stand, as in the exemplary embodiment according to Fig. 3 The upper magnetic field can also be approved by a. ·:. shown. The polarity of the switch must be reversed, so that it is the VqI ⁵ ->. ■ '% In the case of high-pressure gas discharge lamps, support is provided for the arc to run horizontally. - ■ ::. burning arc, the invention can for example: T can be implemented according to FIG. 4. The power supply claims:; · ,, Lines 6 and 8 also have closely approximated 1st electrical high-pressure gas discharge lamps, ί, Sections 10 and 11, between which the ignition 60 \ ^ derei ^ arc by the inherent magnetic field of the of the arc takes place. This moves under the action, inger | k IALB the lamp vessel to the BetriebselÄ the intrinsic magnetic field of the current-carrying power lines through which the current flows influences wt # i; '■■' ■ '■ Sections of the power supply lines 6, 8 or power supply - whereby these power supply lines to the operating elec- 3, 5 wrestled along the power supply lines in this way, trodding only at one point where the ignition was switched off until the electrodes 7, 9 65 discharge, which are seated at their end parts, are initiated, closely approximated to one another reached and then paused there. The repulsive ones, on the other hand, are attached to the operating electrodes; | Effect of the magnetic force of the power supply line 6 and the ends are far away from each other, thereby · "* of the arc 17 at the same time have the consequence that marked / ^r that these power supply lines from ■; , the effect of convection, which causes the highly heated and poorly ¹ electron-emitting, conductive " and thereby to drive lighter arc gases upwards 70 material or are encased with it and furthermore have a sufficient material thickness so that the formation of a glow spot is hindered is, and that these Strqmzuleitungen led in such a way are that the electric arc flows under the influence of the magnetic field. The fiossed sections are slowly moved along the power supply lines to the operating electrodes. 2. High pressure gas discharge lamp according to claim 1, characterized in that the approximated, Sections of the ■ power supply lines between which the arc is ignited next to are arranged on or below the operating electrodes. 3. High pressure gas discharge lamp according to claim 1 and 2, characterized in that in the vicinity of the approximated sections of the power supply lines, preferably between them, an auxiliary ignition electrode is arranged. 4. 'High pressure gas discharge lamp according to claim 1 to 3, characterized in that' that the Auxiliary ignition electrode is designed to be movable, the ", kind that they brought into contact with one of the power supply lines and from her again, e.g. by means of Bimetal strip or magnetic, can be separated. . 5. High pressure gas discharge lamp according to claim 1 to 4, characterized in that the «Operating electrodes or the end parts of the power supply lines that form them in one · the arc are arranged on one side delimiting channel from a, bulge of the lamp vessel or a special, for example ceramic component is formed. 6. High pressure gas discharge lamp according to claim 1 to 5, characterized in that the Part of the vessel wall, which is further away from the canal and serves to emit light, through gas-carrying Internals is protected against the deposition of blackening particles. 7. High-pressure gas discharge lamp according to claim 1 to 5 for a horizontal burning position, characterized characterized in that magnets or current-carrying conductors are arranged outside the lamp, whose magnetic field corresponds to that of the current feed line directed parallel to the arc inside the lamp is directed opposite, so that the arc between the two magnetic fields stabilized. 8. High-pressure gas discharge lamp according to claim 1 to 5 and 7, characterized in that the current-carrying conductors used to generate the magnetic field outside the lamp several are arranged in parallel on a cylinder jacket with the arc as the axis. Q. High pressure gas discharge lamp according to claim 1 to 5 and 7, characterized in that the outside to generate the magnetic field the lamp serving magnet two over the entire length of the arc extending pole pieces owns. Considered publications:
U.S. Patent No. 2,398,111. 1 sheet of drawings © 709 58W22B 7.57