WO1995017002A2 - Procede de fabrication d'une lampe a decharge et lampe a decharge fabriquee selon ce procede - Google Patents

Procede de fabrication d'une lampe a decharge et lampe a decharge fabriquee selon ce procede Download PDF

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Publication number
WO1995017002A2
WO1995017002A2 PCT/EP1994/004200 EP9404200W WO9517002A2 WO 1995017002 A2 WO1995017002 A2 WO 1995017002A2 EP 9404200 W EP9404200 W EP 9404200W WO 9517002 A2 WO9517002 A2 WO 9517002A2
Authority
WO
WIPO (PCT)
Prior art keywords
discharge
tube
tubes
connection
discharge lamp
Prior art date
Application number
PCT/EP1994/004200
Other languages
German (de)
English (en)
Other versions
WO1995017002A3 (fr
Inventor
Dieter STRÜBER
Original Assignee
Strueber Dieter
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 DE19934343007 external-priority patent/DE4343007C2/de
Priority claimed from DE19944403260 external-priority patent/DE4403260A1/de
Priority claimed from EP94301330A external-priority patent/EP0672627A1/fr
Application filed by Strueber Dieter filed Critical Strueber Dieter
Priority to AU12740/95A priority Critical patent/AU1274095A/en
Publication of WO1995017002A2 publication Critical patent/WO1995017002A2/fr
Publication of WO1995017002A3 publication Critical patent/WO1995017002A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
    • H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/04—Re-forming tubes or rods
    • C03B23/06—Re-forming tubes or rods by bending
    • C03B23/065—Re-forming tubes or rods by bending in only one plane, e.g. for making circular neon tubes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/207—Uniting glass rods, glass tubes, or hollow glassware
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H01J61/325—U-shaped lamps

Definitions

  • the invention relates to a method for producing a discharge lamp, in particular a low-pressure mercury vapor discharge lamp, comprising at least two glass discharge tubes running alongside one another, the discharge spaces of which are connected via a connection which preferably runs transversely to their longitudinal extensions, the glass being used to produce the connection in the region of the discharge tubes the connection is softened.
  • the invention also relates to a discharge lamp, in particular a low-pressure mercury vapor discharge lamp, comprising at least two first and second discharge tubes made of glass running alongside one another, which have a luminescent layer on the inside and the discharge spaces of which are connected via a connection running transversely to their longitudinal extensions .
  • DE 30 11 383 C2 proposes that the inner walls of the fluorescent tubes be covered with a fluorescent layer before the connection is made. Furthermore, the cross-connection takes place without additional pipe elements, in that an opening is formed in the wall of each tube with an outwardly facing collar, in order to then fuse the openings with one another via the opposing collars.
  • the disadvantage here is that the glass thickness is uneven in this area due to the formation of the collar, as a result of which stresses can be formed in the glass. As a result, there is also a risk that the glass will break or that leaks occur in the area of the connections.
  • a further method for producing a discharge lamp and such itself can be found in DE 42 02 485 AI.
  • the tube ends to be connected are first closed in order to insert them into mold jaws and then to form them into a desired geometry. Then the ends are opened and blown using blown air.
  • a method for producing a discharge tube for a low-pressure gas discharge lamp in which an unsludged glass tube is gradually tapering from one side towards the center and increasingly symmetrically deformed on the other side, and then the ends of the glass tube are shaped over a semi-circular shape Merge movement.
  • the body of a gas discharge lamp is produced by heating a central part of a glass tube to the softening point, then compressing it in the central part and then bending it into a U-shape.
  • the bent glass tube is placed in a mold in order to achieve a uniform end geometry.
  • the lamp body is surrounded in the region of the electrodes with a heat-dissipating envelope.
  • the present invention is based on the problem of providing a method of the type mentioned at the outset for producing a discharge lamp and a discharge lamp itself, in which or in a simple manner a connection of the discharge tubes is possible without the risk that the Glass tensions are built up or the connection leaks. Also, special shapes for making the cross connection should not be necessary.
  • each discharge tube is softened in the region of an open end, the softened ends of the discharge tubes are connected to form a butt joint, and then the discharge tubes connected in this way are bent to align them side by side.
  • a discharge lamp or a section thereof with discharge tubes running side by side is formed in a simple manner in that sections of a glass tube or two glass tubes, which preferably have luminescent material on the inside, are softened in the region of their available ends, the ends being open. After softening, the glass tube sections or glass tubes are brought into contact to form the butt joint. The glass tubes connected via the butt joint or Sections of these in order to bring about a reduction in cross section in the region of the butt joint. The discharge tubes are then bent, that is to say moved towards one another, in order to align them next to one another.
  • the butt joint connection considerably improves the strength in the area of the connection and considerably reduces the risk of the discharge lamp breaking or leaking in the area of the connection.
  • the configuration of the butt joint according to the invention further ensures that - in contrast to the prior art - the glass has a constant thickness, so that a certain flexibility between the discharge tubes is clearly guaranteed, provided that forces act on them.
  • the internal tension of the glass is reduced, which also largely prevents the connection from breaking.
  • the discharge tubes are aligned along a common straight line in order to form the butt joint.
  • the open ends of the opposing discharge tubes can then be softened with a single heat source such as a flame, in order to subsequently form the butt joint and to pull the discharge tubes apart, so that a uniform reduction in cross-section takes place in the region of the butt joint.
  • the arc is also formed between the discharge tube sections which have not been changed in their cross section when they are bent.
  • the before training Butt joint with discharge tubes coated with fluorescent material in the region of their butt ends are freed of fluorescent material to ensure that the butt joint is not impaired by fluorescent particles.
  • This also has the advantage that, due to the lack of fluorescent material in the region of the butt joint, heat is dissipated better, so that a cooling zone for the finished discharge lamp is made available at the same time.
  • the invention also relates to an application of the previously explained method for producing a U-shaped section as a prefabricated part of a discharge lamp having a plurality of U-shaped sections.
  • This has the advantage that U-sections of discharge lamps can be prefabricated, which can then be arranged with one another using the method according to the invention.
  • the invention is also characterized by a discharge lamp of the type described above in that the connection between the discharge tubes is a butt connection between sections of the discharge tubes which were previously open at the end, the discharge lamp in the region of the butt connection being a compared to the cross section of the discharge tubes outside the Butt joint has a reduced cross section.
  • the cross section of the discharge tubes in the direction of the butt joint is reduced uniformly.
  • the butt joint itself preferably runs in a plane that runs with the plane of symmetry between the discharge tubes.
  • the area of the butt joint between the charge tubes is designed as a cooling zone in that phosphor is removed in this area.
  • the problem underlying the invention can also be solved procedurally in that one end of a first discharge tube is formed as a molded part by softening the glass or, after forming a first opening, is connected to a tube surrounding it and in that the molded part or the tube is connected to the second discharge lamp is connected to a projection starting from this, to a tube surrounding an opening or to an opening formed in a wall section by softening the latter.
  • Both the shaping and the tube are formed starting from the end face of the corresponding discharge tubes or are connected to the latter.
  • the end wall is first softened while at the same time pressurizing the discharge space of the discharge tubes in order to form the first opening and then surround it by melting the tube.
  • Both the molding and the tube initially run essentially parallel to the longitudinal axis of the discharge tubes, in order to then soften the molding or the tube for producing the connection and onto the second discharge tube or the molding or tube emanating therefrom align.
  • the molding or pipes can be cut to the desired length.
  • a connection between the discharge tubes is established in a simple manner by the teaching according to the invention, neither undesirable wall thickening nor stresses being formed in these.
  • Corresponding discharge lamps therefore have high stability, at the same time ensuring that the discharge is formed over the entire length of the discharge tubes, since the connection always runs in the end region, preferably starting from the end walls.
  • the discharge tubes are not connected by a molding, the discharge tubes preferably emanate a tube which is bent into an L.
  • the shaping or the tube or the tubes is preferably bent in a shape-free manner, it being possible for the interior of the discharge tubes to be pressurized with gas, at least when the shaping is formed. This ensures that undesired cross-sectional changes do not occur.
  • a tube or an extension which is also to be referred to as an extended section, is not to be connected to another extended section or tube, but rather directly or essentially directly to a wall section of a discharge tube
  • the invention provides that to form the opening in the second discharge tube, a wall section softens and, with simultaneous pressurization of the discharge space, a bubble is formed and this is then destroyed by the pressure.
  • the softened end region of the elongated section or tube is then connected to the softened wall region of the second discharge tube surrounding the opening.
  • the opening preferably also runs in an end region of the discharge tube.
  • the discharge tube in the region of the cross-connection, which has a fluorescent layer on the inside, to be cleaned in order to rule out the possibility that fluorescent material can be enclosed in the cross-connection.
  • discharge tubes are aligned with one another in such a way that their longitudinal axes converge when viewed from the transverse connection. This ensures that even then, if forces act on the discharge tubes, breaking of the cross-connection is impossible.
  • a discharge lamp in particular a low-pressure mercury vapor discharge lamp, comprising at least two first and second discharge tubes running alongside one another, which have a fluorescent layer on the inside and whose discharge spaces are connected via a cross connection, is further characterized in that the cross connection has at least one with an end face of one the discharge tube comprises fused tube and aligned with the other discharge tube.
  • the tube or the molding of the first discharge tube is preferably fused to a tube or a molding that extends from one end of the other discharge tube.
  • the phosphor is removed in the area of the cross connection.
  • the discharge tubes running alongside one another converge towards their ends with their longitudinal axes, viewed from the transverse connection.
  • the discharge tubes touch or almost touch in their ends remote from the cross-connection.
  • the discharge tubes can have a distance of 0.1 ⁇ 0.1 mm in their corresponding ends.
  • the cross section in the joint area is preferably 10-50%, in particular 20-30%, smaller than that of any discharge lamp.
  • FIG. 1 shows a basic illustration of a section of a first embodiment of a discharge lamp produced according to the invention
  • FIG. 2 shows a detail of a second embodiment of a discharge lamp produced according to the invention
  • FIG. 12 is a front view of a discharge lamp corresponding to FIG.
  • Fig. 13 shows a third embodiment of a manufactured according to the invention
  • Fig. 21 shows a fifth embodiment of a manufactured according to the invention
  • FIG. 1 to 25 in which basically the same elements are provided with the same reference numerals, different embodiments of interconnected discharge tubes are shown, which are intended for a low-pressure discharge lamp such as a low-pressure mercury vapor discharge lamp, one of which is purely exemplary in FIG Fig. 12 is shown and provided with the reference number (10).
  • a low-pressure discharge lamp such as a low-pressure mercury vapor discharge lamp
  • the discharge lamp (10) consists of two discharge tubes (12) and (14), which are coated on the inside in an elongated form with a phosphor and then bent into a U, ie formed.
  • the discharge tubes (12), (14) bent into a U-shape are then connected at one end according to the exemplary embodiments of FIGS. 1 to 11 via a cross connection (16).
  • Connection electrodes (18) and (20) are inserted, via which the discharge tube (10) is supplied with voltage, so that within the discharge tubes (12) and (14), in fact for the most part that of the discharge tubes (12) and ( 14) surrounding discharge spaces can form a plasma.
  • a discharge tube (22) is heated at one end (24) by means of a burner (26) in order to then be elongated, that is to say tapered.
  • an elongated section (28) is formed as a molding, the cross section of which is smaller than that of the discharge tube (22).
  • the formation or the section (28) can start from the end face of a discharge tube which is closed at the end.
  • the discharge tube can be open in the area on the connection side, so that it can be cut to length from a tube coated with fluorescent material on the inside.
  • the discharge tube (22) is then softened by means of the burner (26) in the transition region between the elongated section (28) and the discharge tube (22) which has remained unchanged in cross section in order to bend the elongated end (28). Gas is applied to the interior of the discharge tube (22) in order to ensure during bending that the cross-sectional geometry of the elongated section (28) is not undesirably changed.
  • the elongated section (28) After the elongated section (28) has been bent, it is shortened to a desired length in order to provide a free end face (30).
  • the end (30) is then connected to an appropriately designed elongated end (32) of a second discharge tube (22).
  • the cross-connection (16) connecting the discharge tubes (22) and (34) having an essentially unchanged wall thickness, so that stresses cannot form in the glass.
  • the approximately U-shaped cross-connection (16) gives it a certain flexibility, so that even if the discharge tubes (22) and (34) are moved towards one another, it is ensured that the cross-connection (16) is not breaks.
  • FIGS. 2 and 9 to 11 show a further embodiment for producing a cross connection (38) between two discharge tubes (40) and (42), the discharge tubes (40) corresponding to the discharge tube (22) or (34) is formed, that is to say has a bent, elongated section (28) with an end face (30) which is connected to the discharge tube (42) in the manner below.
  • the discharge tube (42) is closed at its end (44).
  • a wall region (46) is heated below the closure by means of the burner (26).
  • the interior of the discharge tube (42) is pressurized with gas, so that a bubble (48) forms in the area (46), which bursts when further pressure is applied.
  • a circumferential collar (50) is thus formed, which is provided with the free end (30) of the extended section (28).
  • the areas to be connected are softened by means of the burner (26).
  • the discharge tubes (12) and (14) run with respect to their longitudinal axis (52) and (54) inclined to each other, converging viewed from the cross-connection (16).
  • the longitudinal axes (52) and (54) enclose an angle ⁇ , which is preferably in the range between 0.5 ° and 2 °, preferably is 1.2 °.
  • the discharge tubes (12) and (14) can touch in their end regions (56) and (58) which are remote from the transverse connection (16) or can be arranged with only a small distance from one another.
  • the gap in the region of the ends (56) and (58) is preferably 0.1 ⁇ 0.1 mm. This has the advantage that even if forces act on the discharge tubes (12) and (14) from outside, the discharge lamp (10) is not destroyed, especially since additional flexibility is ensured by the cross-connection (16) .
  • FIG. 13 shows a further embodiment of a discharge tube (60) according to the invention, in which discharge tubes (62) and (64) are connected to one another via separate glass tubes (66) and (68) in order to produce the desired cross connection.
  • the discharge tubes (62) are first softened in their preferably closed end wall (70) by means of the burner (26), so as to simultaneously pressurize the interior of the discharge tubes (62) with a tapered section (74) which merges into an opening (72). to build.
  • the section (74) is then fused to the still unbent glass tube (66) which surrounds the opening (72).
  • the tube (66) is then softened and bent, as has been explained with reference to FIG. 7, for example.
  • a desired cutting to length can also be carried out.
  • the discharge tube (64) is connected to the glass tube (68), the free end of which is aligned with the tube (66), as shown in FIG. 18.
  • the free end edges of the tubes (66), (68) are then softened by means of the burner (26) in order to then fuse the discharge tubes (62) and (64).
  • One of the discharge lamps (74) shown in FIG. 19 corresponds to the structure of that of FIG. 2, ie a discharge tube (76) is fused to a second discharge tube (80) via a tapered section (78). Initially, a hole (82) was formed in the discharge tube (80), which was closed at the end, with simultaneous pressurization, the edge of which did not conform to the shape of the Discharge tube (76), but is fused with a glass tube (78) corresponding to the glass tube (66) or (68) of FIGS. 13 to 18.
  • FIG. 21 shows a discharge lamp (84) in which discharge tubes (86) and (88) are connected via a single glass tube (90).
  • the discharge tube (86) is initially pressurized and its end wall (88) is softened in order to form a tapered section (90) with an opening (92) as shown in FIG. 15.
  • the opening (92) is then fused to the glass tube (90), the free end wall (94) of which is aligned with an opening (96) of the discharge tube (88).
  • the tube (90) is softened in order to align the discharge tubes (86) and (88) with one another in the usual way, in order to achieve an end geometry, that can be seen in FIG. 21.
  • the discharge tubes prefferably be fused with a glass tube which forms a U-shape in order to establish the connection between the discharge spaces of the discharge tubes.
  • FIGS. 26-29 show a particularly noteworthy embodiment of a discharge lamp, such as low-pressure mercury vapor discharge lamp (98).
  • the discharge lamp (98) consists of discharge tubes (100), (102) which are connected to one another via a connecting region (104) which comprises a butt joint (106).
  • the butt joint (106) lies in a plane that coincides approximately with the plane of symmetry of the discharge tubes (100) and (102), that is to say in the middle between the discharge tubes (100), (102).
  • connection area (104) the discharge lamp (98) has a cross section which is smaller in comparison to that in each individual discharge tube (100) and (102).
  • This connection area (104) is formed by sections (108) and (110) of the discharge tubes (102) and (100) in the manner described below.
  • the discharge tubes (100) and (102) are coated on the inside with a phosphor in a known manner. Elimination with phosphor can take place before the butt joint (106) is formed or afterwards. Preferably, however, the discharge tubes (100) and (102) are coated with phosphor before the connection (106) is produced.
  • each discharge tube (100), (102) itself can have a U-shape, which is produced by bending a previously elongated tube into a U. This measure is also one that can be found in the prior art.
  • the discharge tube (100), (102) with the connection region (104) having the butt joint (106) is a preliminary product for a discharge lamp which comprises a plurality of corresponding discharge tubes connected by a butt joint.
  • the individual preliminary products can also be connected to one another via a butt connection of the type described below.
  • the discharge tubes (100) and (102) which can be sections of an elongated tube which is preferably previously coated with phosphor, are aligned with one another along a common line with their open ends (110) and (112).
  • the discharge tubes (100), (102) are then softened in their end regions (118) and (120) by means of a heat source such as a flame (114) from a burner (116). Softening the end rich (118) and (120) is done in a way that is known from glass technology, so that there is no need to go into detail.
  • the burner (116) is removed and the ends (110), (112) of the discharge tubes (100), (102) are moved towards one another and brought into contact to form the butt joint (106).
  • the areas (118), (120) adjoining the butt joint (106) are still softened - if necessary, they can be softened again using the flame (114) - so that the discharge tubes (100), (102 ) can be pulled apart in the direction of arrows D (Fig. 29).
  • This stretching results in a reduction in cross-section in the area (104), that is to say the end sections (118), (120) of the discharge tubes (100), (102), as is also illustrated in FIG. 29.
  • the discharge tubes (100), (102) can then be bent.
  • the ends of the discharge tubes remote from the butt joint (106) are moved towards one another.
  • the end U-shape produced in this way in region (104) of the butt joint connection can be a flattened arch, as shown in FIG. 12, in deviation from FIG. 26.
  • the connection area (104) can be brought on the outside with a cooling paste which is located in a receptacle of a lamp base or base cap, in which the bent area (104) is introduced and fixed in position when the discharge lamp (98) is mounted.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

La présente invention concerne une lampe à décharge (98) et son procédé de fabrication. Pour relier, sans tensions, au moins deux tubes à décharge en verre disposés côte à côte (100, 102) par une connexion transversale (104, 106), il est proposé de ramollir chaque tube à décharge (100, 102) à une extrémité ouverte (110, 112), de relier leurs extrémités ramollies pour former un joint bout à bout (110) et de recourber ensuite les tubes à décharge pour qu'ils se retrouvent côte à côte.
PCT/EP1994/004200 1993-12-16 1994-12-16 Procede de fabrication d'une lampe a decharge et lampe a decharge fabriquee selon ce procede WO1995017002A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12740/95A AU1274095A (en) 1993-12-16 1994-12-16 Method of manufacturing a discharge lamp and discharge camp manufactured according to this method

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19934343007 DE4343007C2 (de) 1993-12-16 1993-12-16 Verfahren zur Herstellung einer Entladungslampe
DEP4343007.4 1993-12-16
DE19944403260 DE4403260A1 (de) 1994-02-03 1994-02-03 Entladungslampe sowie Verfahren zur Herstellung einer solchen
DEP4403260.9 1994-02-03
EP94301330.0 1994-02-24
EP94301330A EP0672627A1 (fr) 1994-02-24 1994-02-24 Procédé de fabrication d'une lampe à décharge à mercure à basse pression

Publications (2)

Publication Number Publication Date
WO1995017002A2 true WO1995017002A2 (fr) 1995-06-22
WO1995017002A3 WO1995017002A3 (fr) 1995-08-10

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Application Number Title Priority Date Filing Date
PCT/EP1994/004200 WO1995017002A2 (fr) 1993-12-16 1994-12-16 Procede de fabrication d'une lampe a decharge et lampe a decharge fabriquee selon ce procede

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AU (1) AU1274095A (fr)
WO (1) WO1995017002A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011117067A1 (fr) * 2010-03-26 2011-09-29 Osram Gesellschaft mit beschränkter Haftung Procédé de liaison de corps en verre creux et récipient à décharge

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FR771173A (fr) * 1933-04-04 1934-10-02 Philips Nv Tube à décharges électriques
FR2453495A1 (fr) * 1979-04-03 1980-10-31 Philips Nv Procede pour la realisation d'une lampe a decharge dans la vapeur de mercure a basse pression et lampe ainsi obtenue
EP0284576A2 (fr) * 1987-03-23 1988-09-28 Lumalampan Aktiebolag Tube à décharge à gaz compact et une méthode pour sa fabrication
US4830648A (en) * 1987-09-04 1989-05-16 Patent Treuhand Gesellschaft Elektrische Gluhlampen M.B.H. Method of making a unitary tubular generally U-shaped discharge vessel, particularly for compact fluorescent lamps
DE4202485A1 (de) * 1992-01-27 1993-07-29 Dieter Krebs Niederdruckgasentladungslampengefaess und verfahren zur herstellung
EP0622831A1 (fr) * 1993-04-27 1994-11-02 Mass Technology (H.K.) Ltd. Procédé de fabrication d'une lampe à décharge de mercure à basse pression

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JPS60100357A (ja) * 1983-11-02 1985-06-04 Mitsubishi Electric Corp 低圧放電ランプ
JPS62157661A (ja) * 1985-12-28 1987-07-13 Nec Home Electronics Ltd 曲管形螢光ランプ
JPS62202452A (ja) * 1986-02-28 1987-09-07 Toshiba Corp 蛍光ランプ
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JPH0215556A (ja) * 1988-07-04 1990-01-19 Toshiba Lighting & Technol Corp 低圧放電ランプおよびその製造方法

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FR771173A (fr) * 1933-04-04 1934-10-02 Philips Nv Tube à décharges électriques
FR2453495A1 (fr) * 1979-04-03 1980-10-31 Philips Nv Procede pour la realisation d'une lampe a decharge dans la vapeur de mercure a basse pression et lampe ainsi obtenue
EP0284576A2 (fr) * 1987-03-23 1988-09-28 Lumalampan Aktiebolag Tube à décharge à gaz compact et une méthode pour sa fabrication
US4830648A (en) * 1987-09-04 1989-05-16 Patent Treuhand Gesellschaft Elektrische Gluhlampen M.B.H. Method of making a unitary tubular generally U-shaped discharge vessel, particularly for compact fluorescent lamps
DE4202485A1 (de) * 1992-01-27 1993-07-29 Dieter Krebs Niederdruckgasentladungslampengefaess und verfahren zur herstellung
EP0622831A1 (fr) * 1993-04-27 1994-11-02 Mass Technology (H.K.) Ltd. Procédé de fabrication d'une lampe à décharge de mercure à basse pression

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011117067A1 (fr) * 2010-03-26 2011-09-29 Osram Gesellschaft mit beschränkter Haftung Procédé de liaison de corps en verre creux et récipient à décharge

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WO1995017002A3 (fr) 1995-08-10

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