EP0000842B1 - Niederdruckmetalldampfentladungslampe - Google Patents

Niederdruckmetalldampfentladungslampe Download PDF

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Publication number
EP0000842B1
EP0000842B1 EP78300262A EP78300262A EP0000842B1 EP 0000842 B1 EP0000842 B1 EP 0000842B1 EP 78300262 A EP78300262 A EP 78300262A EP 78300262 A EP78300262 A EP 78300262A EP 0000842 B1 EP0000842 B1 EP 0000842B1
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EP
European Patent Office
Prior art keywords
tube
anodes
discharge
discharge lamp
lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78300262A
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English (en)
French (fr)
Other versions
EP0000842A1 (de
Inventor
Yoshio Watanabe
Mikiya Yamane
Teruichi Tomura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP52095041A external-priority patent/JPS581509B2/ja
Priority claimed from JP11562377A external-priority patent/JPS5450165A/ja
Priority claimed from JP11562277A external-priority patent/JPS5450164A/ja
Priority claimed from JP11562477A external-priority patent/JPS5450166A/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to DE8181102980T priority Critical patent/DE2862474D1/de
Publication of EP0000842A1 publication Critical patent/EP0000842A1/de
Application granted granted Critical
Publication of EP0000842B1 publication Critical patent/EP0000842B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/92—Lamps with more than one main discharge path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/10—Shields, screens, or guides for influencing the discharge
    • H01J61/103—Shields, screens or guides arranged to extend the discharge path

Definitions

  • the present invention relates to low pressure metal vapour discharge lamps and, more particularly, to such a lamp having an outer glass envelope defining a closed discharging space, an inner glass tube disposed within said envelope and having an open end and a closed end, a cathode disposed within said tube and a plurality of anodes disposed within said envelope outside said tube.
  • the conventional low pressure metal vapour discharge lamp such as the common fluorescent strip lamp (which is a low pressure mercury vapour discharge lamp), has an elongate glass tube provided at both ends with electrodes and containing a rare gas at a few Torr pressure and a small amount of a metal such as mercury.
  • This type of lamp has a considerable length for a given lighting power.
  • a straight tube fluorescent lamp of this type may be 120 cm long for an electric input of 40W.
  • this double-base type of fluorescent lamp i.e. a lamp having two ends with electrodes
  • a lamp having two ends with electrodes makes it inconvenient or unsuitable for some uses. There is thus a demand for a smaller fluorescent lamp having a reduced tube-length, while still providing the required brightness.
  • Japanese Patent Publication No. 35796/1974 discloses a novel fluorescent lamp having only one base.
  • This lamp has a double-tube structure consisting of a fully closed outer glass bulb and an inner glass tube within the outer glass bulb, the inner tube being open at its one end but closed at its other end.
  • a single cathode is disposed within the inner tube, while a single anode is disposed outside the inner tube.
  • the discharge path formed between the two electrodes bends at the open end of the inner tube, so that a sufficient length of discharge path can be obtained with a relatively short lamp.
  • the luminous efficiency is improved, because the surface area of the glass surrounding the discharging space, to which phosphor material paint is applied, is increased.
  • This known double-tube type discharge lamp however, has the disadvantage that it is difficult to distribute the discharge plasma uniformly over the entire discharging space between the inner tube and the outer bulb. Instead, the discharge plasma outside the inner tube is concentrated in the region which exhibits the smallest resistance to the discharge current, and is not spread uniformly over the entire discharge space. This local concentration of the discharge plasma cannot be avoided even by use of a ring-shaped anode disposed around the inner tube. In such a lamp, the luminous intensity is high only at the region where the plasma is locally concentrated, while only a low luminous intensity is obtained at regions of the lamp where the plasma is not distributed. Thus, it is difficult to obtain uniform luminous intensity distribution over the entire lamp body.
  • the discharge plasma which is locally concentrated in a portion of the discharging space, changes its position irregularly, causing flickering.
  • the IES article discloses the use of a fluted inner tube, to avoid the merging of adjacent arcs by confining the ionized paths.
  • the aim is to achieve a highly uniform light output distribution over the whole of the lamp, without a complicated and expensive switching circuit such as is proposed in the lamp last described above.
  • the invention is based on the discovery that stable multi-channel arcs can exist if the circuit is such as to allow an anode oscillation current to flow between the anodes.
  • the anode oscillation at each anode is therefore influenced by that at the other anode or anodes (e.g. if there are two anodes, they oscillate alternatingly).
  • Overall current is limited by the ballast means. No external switching is required, so that a simple and economic circuit is feasible.
  • means are preferably provided for fixing the locations of the paths of the discharge currents corresponding to the respective plasma lines, so as to prevent fluctuation of the positions of the plasma lines.
  • Any construction which exclusively defines the paths for the respective discharge currents can be used as the means for fixing the locations of the discharge current paths. A number of such constructions are described below. The effect of such means is to define, for each of the plasma lines, a stable current path through which the discharge current can flow, the path specifically having a lower resistance than adjacent regions.
  • This arrangement affords a substantially uniform luminous intensity distribution over the whole part of the lamp, because of the presence of a plurality of plasma lines corresponding to respective anodes and disposed around the inner glass tube. In addition, flickering of the output light is avoided because irregularfluctua- tion of the discharge plasmas does not occur.
  • the lamp shown therein has an elongated bulbous outer glass bulb 1, a cylindrical tubular inner glass tube 2 and a stem 3.
  • the bulb 1 is fusion-welded at its lower end to the stem 3, so as to constitute a completely closed discharge vessel, while the tube 2 is bonded or fusion-welded at its lower end to the stem 3, and is thereby held at the center of the space within the outer bulb 1 and coaxial therewith.
  • the tube 2 is open at its upper end but is closed at its lower end by the stem 3.
  • a sole cathode 4 (a filament electrode coated with an electron-emitting substance) is disposed within the inner tube 2 near its lower end.
  • a plurality of anodes each in the form of a separate rod-shaped electrode are disposed in the lower part of the discharging space defined by the outer surfaces of the tube 2 and the inner surface of the bulb 1, in the region of the discharging space close to the closed end of the tube 2.
  • two anodes 5, 5' are disposed diametrically opposite each other, i.e. at positions symmetrical with respect to the axis of the tube 2.
  • the inner peripheral surface of the bulb 1 is coated with a film (not shown) of a fluorescent material.
  • the rim 2' of the tube 2 is notched at portions 6, 6' respectively axially aligned with the anodes 5, 5'.
  • the space inside the discharge vessel 1 is evacuated via an . exhaust tube (not shown) provided in the stem 3, and is then charged with a rare gas at low pressure (e.g. argon gas of a few Torr) and a small amount of metal such as mercury. Finally, this space is sealed at the end of the exhaust tube.
  • a rare gas at low pressure e.g. argon gas of a few Torr
  • metal such as mercury
  • a single base (not shown) is attached to the lower end portion, i.e. to the stem portion, of this double-tube type discharge lamp, which is thus a single-base type lamp.
  • the lamp is connected to an A.C. source 13 through an ignition circuit including a ballast 7, a diode bridge rectifier circuit 8 and a glow lamp 9.
  • the two anodes 5, 5' are in this embodiment directly connected to each other without impedance between them.
  • This ignition circuit may be produced separately from the lamp body, or may be incorporated in the base attached to the lamp.
  • the A.C. voltage is rectified by the diode bridge rectifier circuit 8 the output from which ignites the glow lamp 9. Since the contact is made in the glow lamp 9, preheating current flows through the cathode 4.
  • a high voltage pulse is applied between the anodes 5, 5' and the cathode 4, at the instant at which the contact is broken, so as to cause electric discharges between the cathode 4 and respective anodes 5, 5', bringing the lamp into operation.
  • the inner tube 2 is disposed coaxially at the center of the outer bulb 1, and the two anodes 5, 5' are symmetrical with respect to the axis of the inner glass tube 2, being mounted similarly.
  • the voltage levels applied to both anodes by the rectifier circuit 8 through the common single ballast in the ignited condition are equal. In this condition, anode oscillations take place alternatingly at the two anodes.
  • Two paths for the discharge current are formed: one being between the anode 5 and the cathode 4 via the notch 6 in the rim 2' of the tube 2, while the other is between the anode 5' and the cathode 4 via the other axial notch 6'.
  • These two discharge currents each include the anode oscillation current which oscillates at high frequency, due to the anode oscillation taking place alternatingly at the anodes 5, 5'.
  • the anode oscillation current is able to pass between the anodes because they are directly connected together.
  • Fig. 4B described below illustrates this anode oscillation current.
  • Fig. 4A is a transverse cross-sectional view of the lamp of Fig. 1 at a plane including the notches 6, 6' showing the axial alignment of the notches 6, 6' and the anodes 5, 5' and indicating how the two discharge currents generate two plasmas 11, 11' outside the tube 2.
  • the wave forms of the current of the plasma 11 of one of the anodes and its luminescence over a half cycle of the rectified A.C. of the power source are shown in Fig. 4B.
  • the current includes an oscillation component at a frequency of 1.5 KHz, as does the luminous intensity. This current oscillation is due to the anode oscillation current flowing between the two anodes. It can be seen in Fig.
  • the notches 6, 6' in the rim 2' of the tube 2 fix the path of each discharge current at a constant position on the circumference of the rim 2' thereby stabilizing the position at which each plasma is formed. If there were no notches 6, 6' each discharge current would tend to select a path of the shortest length, i.e. the path of least resistance. However, since there is no substantial difference in path length, whichever part of the rim 2' the path may pass over, the discharge current does not always select the same discharge path, but rather fluctuates over a selected region irregularly. Consequently, the position of each plasma changes irregularly to cause flickering of the output light from the lamp.
  • the notches 6, 6' have any suitable shape.
  • each can be rectangular as illustrated in Fig. 2 or have a valley-like shape with gentle slopes as shown in Fig. 3, or even a V-shape.
  • the width and depth of the notch can easily be suitably selected. All that is required is to fix the paths of the respective discharge currents of the respective anodes.
  • a discharge lamp having these particulars has been experimentally manufactured. Its luminous condition, when ignited by commercial A.C. 100V power supply through the ignition circuit shown in Fig. 1 confirmed that the plasmas are made substantially unitary with each other within the tube 2 where they are stabilized by the wall of the tube 2. The two plasmas separate from each other as they clear the open end of the tube 2, and lead to the respective anodes.
  • the two plasmas are sufficiently diffused and spread laterally, so that almost the whole of the discharging space is uniformly filled with the plasma. It is thought that the two plasmas are stabilized in this discharging space by the walls of the inner tube and the outer bulb.
  • the means for stabilizing the plasmas by fixing the paths of the respective discharge currents may be other than the notches so far discussed.
  • these means may be constituted by a partition plate secured to the open end of the tube 2 in such a manner as to isolate the discharge plasmas from one another.
  • An example of this arrangement is shown in Figs. 5A and 5B. It will be seen that a partition plate 14 extends diametrically across the open end of tube 2, perpendicularly to the line connecting the anodes 5, 5'.
  • the two plasmas are physically separated from each other by the partition plate 14 as they clear the open end of the tube. In addition, they are prevented from changing their positions by the presence of the partition plate 14 and are therefore held in a stable manner.
  • Fig. 6 shows a partition wall at the open end of the tube 2 provided by a downward projection or ridge 1' of the top of the bulb 1 extending to within the open end of the tube 2.
  • This ridge 1' extends perpendicularly to the plane of the drawing, so as to isolate the plasmas from one another.
  • This arrangement produces the same effect as the plate 14 of Figs. 5A and 5B. Needless to say, it is possible to use the notches 6, 6' in combination with either the partition plate 14 or the plate-like projection 1'.
  • an elongated fin-shaped partition plate 15 is fixed to the tube 2 instead of the notches 6, 6' or the partition plates already described.
  • This plate 15 consists of a portion 1 5' which divides the discharging space around the open end 2' of the tube 2 and portions 15" which extend along the tube 2 for more than half its length and divide the discharging space around the external surface of the tube 2.
  • This partition plate 15 extends diametrically at a right angle to the line connecting the anodes 5, 5' in a plane which contains the axis of the tube 2.
  • the ignition circuit for this lamp may be that of Fig. 1.
  • two plasmas are formed simultaneously in the discharging space around the tube 2, by the two discharge currents flowing along the paths between the respective anodes 5, 5' and the common cathode 4. These two plasmas are stabilized by the partition wall 15. More specifically, the plasmas, which are unitary within the tube 2, are separated from each other as they pass over the rim 2' and are stabilized in the area around the opening end of the tube 2, because they are completely isolated from each other by the upper portion 15' of the plate 15. Thus, no irregular fluctuation of the plasmas around the rim 2' takes place.
  • the two plasmas are not always spread over the entire volume of the discharging space.
  • the paths of the two discharge currents are fixed in respective portions of the discharging space, so that the resulting two plasmas are held extremely stably.
  • the ultraviolet radiation from both plasmas is converted into visible radiation by the fluorescent films 16 within the lamp. This visible radiation is scattered and reflected repeatedly within the lamp, so that an essentially uniform luminous intensity distribution is obtained over the entire surface of the lamp.
  • the partition plate 15 not only stabilizes the paths of the discharge currents over almost the whole length of the lamp, but also increases the area of the wall surfaces in the lamp, i.e. the area of the fluorescent films, thereby improving luminous efficiency.
  • Figs. 8A and 8B show another means for stabilizing the discharging plasmas outside the tube 2.
  • This is a flange-like annular plate 17 secured to the outside of the tube 2 a short distance from the rim 2'.
  • This plate 17 has peripheral notches 18, 18' and extends perpendicularly to the axis of the tube 2.
  • the notches 18, 18' are diametrically opposite each other, i.e. in symmetry with respect to the axis of the tube 2, such that each notch 18, 18' corresponds to one of the anodes 5, 5'.
  • the discharge currents flowing from the rim 2' of the tube 2 to the anodes 5, 5' pass through the respective notches 18, 18'.
  • the flange-like plate 17 may be single as shown or may be repeated at a suitable axial spacing. Also, it is possible to use this plate 17 in combination with a longitudinal partition plate 15 such as shown in Figs. 7A, 7B and 7C. These plates 15, 17 may be used in combination with the notches 6, 6' shown in Fig. 1.
  • solid fillers 19 such as glass fibre or glass wool are provided around the tube 2, in place of the plate 15 secured to the outer surface of the tube 2, so as to fix the paths of the discharge currents, thereby stabilizing the discharge plasmas. More specifically, portions of the discharging space which divide the whole discharging space into two sections corresponding to the two anodes 5, 5' are filled with solid fillers 19 such as glass wool at a relatively high density, whereas the space corresponding to the anodes 5, 5' are not filled with the fillers 19 at all or are charged with the fillers only at a low density.
  • the fillers 19 are bundled so as to have a high density at a region extending across the rim 2' of the tube 2 at a right angle to the line intersecting the anodes 5, 5'.
  • the fillers 19 are secured to and suspended from the rim 2'.
  • the inner surface of the bulb 1 and both surfaces of the tube 2 are coated with fluorescent films 16, while the space inside the discharge vessel has been evacuated and filled with mercury and a rare gas at a pressure of a few Torr.
  • This lamp can be ignited also using the ignition circuit shown in Fig. 1.
  • the channels of the discharge currents of the two anodes are fixed by the presence of the solid fillers 19 so that the plasmas are generated and maintained in a stable manner. This is because the discharge currents avoid the regions where the density of the fillers is relatively high, i.e. regions having higher resistance, and flow only through the regions where no filler is provided or where the filler is at only a low density, i.e. only through the regions where the resistance is relatively low.
  • the density of the fillers in the region of higher density is preferably 10- 4 to 10- 3 (volume ratio), while in the region of low density it is preferably one-third to about one fiftieth of that of the region of higher density.
  • These fillers 19 may be coated with the fluorescent paint, so as to increase the efficiency of conversion of the ultraviolet radiation radiated from the plasmas into visible radiation.
  • the fillers are effective not only in forming stable paths for the discharge currents, but also in increasing the loss of charged particles in the plasmas, thereby enhancing the operating voltage of the lamp. It is therefore possible to operate the lamp to a high voltage, even when the size of the lamp is small.
  • this embodiment can be effectively used as a light source for general illumination making use of commercially available A.C. 100V power.
  • the glass wool constituting the fillers 19 may be substituted by fine glass tubes having much greater diameter than the glass wool, or by insulating material other than glass, achieving similar effects.
  • Figs. 10A, 10B and 10C show a further embodiment of the invention, in which, in order to stabilize the discharge plasmas, the inner glass tube 2 has a flattened cross-sectional shape. More specifically, the tube 2 is of flattened shape such that its major transverse axis extends perpendicularly to the line connecting the anodes 5, 5'. Consequently, the discharging space around the tube 2 is wider where the anodes 5, 5' are provided and narrower at the areas remote from both anodes 5, 5'. Consequently the discharge currents flow through the wider regions of the discharging space where resistance is relatively small, avoiding the narrowed areas where resistance is relatively high. The paths of the discharge currents are thus fixed, leading to stable generation and maintenance of the plasmas.
  • the lamp of this embodiment may be considered as being effectively a large output lamp, because it can be a small- sized double-tube type lamp having a high lamp temperature and high pressure of mercury vapour.
  • the flattened shape of the inner glass tube offers the additional advantage of high efficiency of conversion of the ultraviolet radiation to visible radiation and, accordingly, provides a higher lamp efficiency.
  • the flattened shape of the inner glass tube does not pose problems in practical use as a general lighting source, because it does not cause any change of the external appearance and design of the lamp.
  • the tube 2 can have an oval shape as shown in Fig. 11.
  • the same result can be achieved by means of a tube 2 having a rectangular cross-section as shown in Fig. 13.
  • two discharge plasmas are formed by two anodes in the lamp
  • three or more anodes suitably spaced apart (preferably uniformly) and make these anodes maintain their plasmas, by applying substantially equal voltage simultaneously to the anodes in the manner described above, while permitting the anode oscillation current to flow between the anodes.
  • the means for fixing the discharge paths such as notches, partition plates, masses of fillers, are selected to correspond in number to the number of anodes.
  • the lamp of the invention can be used most conveniently for general illuminating purposes.
  • the lamp has a single base and can be small in size on account of the double-tube structure. A stable light output is achieved, and the plasmas occupy most of the volume of the envelope.

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Claims (10)

1. Niederdruck-Metalldampfentladungslampe mit einem einen geschlossenen Entladungsraum definierenden äußeren Glasgefäß (1), einem in dem besagten Gefäß (1) angeordneten inneren Glasrohr (2) mit einem offenen Ende (2') und einem geschlossenen Ende, einer innerhalb des besagten Rohres (2) angeordneten Kathode (4), einer innerhalb des Gehäuses (1) außerhalb des Rohres (2) angeordneten Vielzahl von Anoden (5, 5'), und einer Schaltungseinrichtung (7, 8, 9) zur gleichzeitigen Zuführung von Spannung an die Anoden, wobei besagte Schaltungseinrichtung eine Ballasteinrichtung (7) zur Stromstabilisierung enthält, dadurch gekennzeichnet, daß in der besagten Schaltungseinrichtung die Verbindung zwischen den Anoden (5, 5') derart getroffen ist, daß ein Anoden-Oszillationsstrom, der auf der an jeder der Anoden auftretenden Anodenoszillation beruht und in dem Entladungsstrom -jeder betreffenden Anode enthalten ist, zwischen den Anoden (5, 5') fließen kann, so daß in dem Entladungsraum eine Vielzahl von stabilen Entladungsplasmen vorgesehen wird.
2. Entladungslampe nach Anspruch 1, wobei die Anoden (5, 5') im wesentlichen direkt miteinander verbunden sind und die besagte Ballasteinrichtung (7) ein sämtlichen Anoden (5, 5') gemeinsamer einziger Ballast ist.
3. Entladungslampe nach Anspruch 1, wobei der Aufbau der Lampe so getroffen ist, daß die Orte der Entladungswege zu den jeweiligen Anoden relativ fixiert sind, um Fluktuationsbewegungen der Entladungsplasmen zu verhindern.
4. Entladungslampe nach Anspruch 3, wobei Einrichtungen vorgesehen sind, um die Orte der besagten Entladungswege zu fixieren und diese Einrichtungen eines oder mehrere der folgenden Merkmale unfassen:
(a) Nuten (6, 6') im Rand (2') des Rohrs (2) an seinem offenen Ende;
(b) ein Unterteilungselement (1'; 13'; 15') am oder nahe dem offenen Ende des Rohrs (2);
(c) eine Vielzahl von Plattenelementen (15"; 20), die von der Außenwand des Rohrs (2) nach außen ragen und in Längsrichtung längs dieser Wand verlaufen;
(d) mindestens ein flanschartiges Element (17), das von der Außenwand des Rohrs (2) senkrecht zur Achse des Rohres (2) nach außen ragt und eine Vielzahl von in Umfangsrichtung in Abstand angeordneten Nuten oder Spalten (18, 18') aufweist;
(e) ein in dem Entladungsraum angeordnetes festes Füllmaterial (19), wobei die Dichte des festen Füllmaterials in Bereichen, in denen sich die besagten Entladungswege bilden sollen, gering oder null und in Bereichen, in denen sich derartige Wege nicht bilden sollen, verhältnismäßig hoch ist.
5. Entladungslampe nach Anspruch 4, wobei das feste Füllmaterial (19) in Form von Glaswolle vorgesehen ist.
6. Entladungslampe nach einem der vorhergehenden Ansprüche, wobei das Rohr (2) zentrisch in dem Gehäuse (1) angeordnet ist, und das Rohr (2) und das Gehäuse im wesentlichen koaxial sind.
7. Entladungslampe nach einem der vorhergehenden Ansprüche, wobei die Anoden (5, 5') zwei an der Zahl sind.
8. Entladungslampe nach Anspruch 7, wobei das Rohr (2) im Querschnitt eine längliche oder abgeflachte Form hat (Figuren 10-13).
9. Entladungslampe nach einem der vorhergehenden Ansprüche, wobei die Anoden in gleichmäßigen Abständen über den Umfang des Rohrs (2) verteilt sind.
10. Entladungslampe nach einem der vorhergehenden Ansprüche, wobei die Kathode (4) in dem Rohr (2) nahe dem besagten geschlossenen Ende des Rohrs (2) angeordnet ist, und die Anoden (5, 5') außerhalb des Rohrs (2) nahe dem besagten geschlossenen Ende des Rohrs (2) angeordnet sind.
EP78300262A 1977-08-10 1978-08-07 Niederdruckmetalldampfentladungslampe Expired EP0000842B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8181102980T DE2862474D1 (en) 1977-08-10 1978-08-07 Low pressure metal vapour discharge lamp

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP95041/77 1977-08-10
JP52095041A JPS581509B2 (ja) 1977-08-10 1977-08-10 低圧気体放電灯
JP115622/77 1977-09-28
JP11562377A JPS5450165A (en) 1977-09-28 1977-09-28 Low-pressure vapor discharge lamp
JP115623/77 1977-09-28
JP11562277A JPS5450164A (en) 1977-09-28 1977-09-28 Low-pressure vapor discharge lamp
JP115624/77 1977-09-28
JP11562477A JPS5450166A (en) 1977-09-28 1977-09-28 Low-pressure vapor discharge lamp

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP81102980.0 Division-Into 1978-08-07

Publications (2)

Publication Number Publication Date
EP0000842A1 EP0000842A1 (de) 1979-02-21
EP0000842B1 true EP0000842B1 (de) 1982-12-15

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EP81102980A Expired EP0037589B1 (de) 1977-08-10 1978-08-07 Metalldampfniederdruckentladungslampe
EP78300262A Expired EP0000842B1 (de) 1977-08-10 1978-08-07 Niederdruckmetalldampfentladungslampe

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EP81102980A Expired EP0037589B1 (de) 1977-08-10 1978-08-07 Metalldampfniederdruckentladungslampe

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EP (2) EP0037589B1 (de)
DE (1) DE2862125D1 (de)

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KR950007895A (ko) * 1993-09-24 1995-04-15 박경팔 메탈 할라이드 램프
DE19513357A1 (de) * 1995-04-06 1996-10-10 Walter Holzer Elektrodenanordnung in Leuchtstofflampen
DE19519518A1 (de) * 1995-06-01 1996-12-05 Walter Holzer Gasentladungsgefäß für Niederdruckentladungslampen
DE19925406A1 (de) * 1999-06-02 2000-12-14 Promatec Gmbh Berlin Gasentladungslampe, insbesondere Niederdruckgasentladungslampe
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JP4986509B2 (ja) * 2006-06-13 2012-07-25 株式会社オーク製作所 紫外連続スペクトルランプおよび点灯装置

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DE974453C (de) * 1948-10-10 1960-12-29 Ulrich W Doering Elektrische Entladungslampe mit Edelgasfuellung von niedrigem Druck und mit im Lampenkolben angeordneten Trennwaenden
FR1413731A (fr) * 1964-11-12 1965-10-08 Thomson Houston Comp Francaise Perfectionnements aux appareils de ballast avec self-induction
US3609436A (en) * 1969-04-21 1971-09-28 Gen Electric Fluorescent light source with a plurality of sequentially energized electrodes
US3849689A (en) * 1973-07-02 1974-11-19 Gen Electric Sequential discharge fluorescent lamp
NL179771C (nl) * 1976-06-17 1986-11-03 Philips Nv Lagedrukgasontladingslamp.

Also Published As

Publication number Publication date
US4438373A (en) 1984-03-20
US4335331A (en) 1982-06-15
EP0037589A2 (de) 1981-10-14
EP0000842A1 (de) 1979-02-21
EP0037589B1 (de) 1985-11-21
EP0037589A3 (en) 1981-12-30
DE2862125D1 (en) 1983-01-20

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