EP0924745B1 - Fluoreszenzlampe - Google Patents

Fluoreszenzlampe Download PDF

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Publication number
EP0924745B1
EP0924745B1 EP98122236A EP98122236A EP0924745B1 EP 0924745 B1 EP0924745 B1 EP 0924745B1 EP 98122236 A EP98122236 A EP 98122236A EP 98122236 A EP98122236 A EP 98122236A EP 0924745 B1 EP0924745 B1 EP 0924745B1
Authority
EP
European Patent Office
Prior art keywords
lead wires
stem
lamp
fluorescent lamp
insulator
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 - Lifetime
Application number
EP98122236A
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English (en)
French (fr)
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EP0924745A3 (de
EP0924745A2 (de
Inventor
Mamoru Fukushima
Yasuo Kobayashi
Soichiro Ogawa
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
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Filing date
Publication date
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Publication of EP0924745A2 publication Critical patent/EP0924745A2/de
Publication of EP0924745A3 publication Critical patent/EP0924745A3/de
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Publication of EP0924745B1 publication Critical patent/EP0924745B1/de
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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
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/045—Thermic screens or reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/366—Seals for leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
    • 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
    • H01J9/28—Manufacture of leading-in conductors

Definitions

  • the present invention relates to a fluorescent lamp and a fluorescent lamp device. More particularly, the present invention relates to a fluorescent lamp which can suppress melting of stem glass when inner lead wires of a stem are discharged as electrodes and can prevent short-circuiting between the inner lead wires caused by adhesion or deposition of spattering material produced by vaporization of filaments and inner lead wires.
  • the material (W) of the filaments, the emitter material (BaO, etc.) coated on the filaments and the material (Ni, Fe) of the inner lead wires spatter and adhere or deposit onto tip end faces of flare stems close to the filaments.
  • these substances tend to spatter and adhere or deposit onto the tip end face of each of the flare stems.
  • the above adhesive or deposit which is electrically conductive, may establish an electric path and energized when deposited.
  • the spattered material adhered and deposited on the tip end face of the flare stem may establish an electric path on the surface of the flare stem between a pair of electrically-isolated inner lead wires, thus leading to electric conduction between the inner lead wires.
  • a current flows through the electric path to heat the flare stem surface, which disadvantageously results in over-heat damage of the flare stem or in a large wattage loss due to short-circuiting.
  • Such an operation mode is called a second operation mode.
  • JP-A-6-338289 Publication referred to as the known citation 1, hereinafter
  • JP-A-6-338289 Publication referred to as the known citation 1, hereinafter
  • Figs. 1A to 1C show an embodiment of a lamp disclosed in the known citation 1, wherein Fig. 1A is a cross-sectional view of the lamp, Fig. 1B is a cross-sectional view of the lamp taken along line A-A in Fig. 1A, and Fig. 1C is a cross-sectional view of the lamp taken along line B-B in Fig. 1A.
  • a recess 202 is made in a flare stem at at least one of root parts of a pair of inner lead wires 201 (The recess is made only at one lead wire in the drawing).
  • reference numeral 203 denotes an exhaust hole of an exhaust tube in the flare stem.
  • the recess may be made in an intermediate part 204 of the flare stem. Such a recess functions as a drop place. With such an arrangement, at the end of the lamp life, substance spattered from the electrode deposits on the flare stem. However, there is such a description in the citation that the presence of the recess functioning as the drop place makes it difficult for the substance to deposit only on that recess area, thus preventing establishment of an electric path and avoiding an electric short-circuiting between the pair of lead wires.
  • Fig. 2 is an alternate of the arrangement of Fig. 1 disclosed in the citation 1.
  • the same reference numerals as those in Fig. 1 denote the same parts.
  • the arrangement of Fig. 2 is different from that of Fig. 1 in that the recess 202 is replaced by such an insulation tube 205 as to surround the neighborhood of a sealing part of at least one of the inner lead wires 201 (The insulation tube 205 is provided only one lead wire in the drawing).
  • the above spattered substance can deposit on the flare stem but less deposit on the inner lead wires 201 in the vicinity of the sealing part, thus blocking formation of the aforementioned electric path.
  • Fig. 3 shows another alternate of the arrangement of Fig. 1 disclosed in the citation 1.
  • the same reference numerals as those in Fig. 1 denote the same parts as those in Fig. 1.
  • a difference between the arrangement of Fig. 3 and that of Fig. 1 is that the recess 202 in Fig. 1 is replaced by an overhanging member 206 which is provided only for at least one of the pair of inner lead wires 201 (In the illustrated example, the overhanging member 206 is provided only one lead wire).
  • the citation discloses an arrangement in which, as shown in Fig. 4, a glass bead 101 is fixedly mounted to a pair of lead wires 102. This enables reduction of an oxidizing rate of the lead wires and avoidance of an extremely short life of a fluorescent lamp. With such an arrangement, the presence of the glass bead 101 enables reduction of the amount of deposit spattered onto the lead wires 102 and onto an area 110 on the flare stem. However, since the above spattered deposit substance deposits on the glass bead 101, a short-circuiting may disadvantageously take place between the pair of lead wires through the deposit on the glass bead 101.
  • reference numeral 105 denotes a bead mount
  • numeral 106 denotes a filament coil
  • 105 denotes a bead mount
  • 109 denotes an exhaust tube.
  • Fig. 23 shows an arrangement in the vicinity of a lamp electrode.
  • a button stem 27 is air-tightly joined to an end of a glass bulb 21 by means of an adhesive agent (not shown).
  • a support rod 29 is provided to the button stem 27 .
  • the heat shielding plate 30, which is disposed between an electrode 26 and stem 27, is made of heat-resistive metal such as stainless material.
  • Numerals 28a and 28b denote lead wires respectively.
  • JP-A-54-44372 Publication is JP-A-54-44372 Publication.
  • the citation is directed to an improvement in an interior 2 of a fluorescent lamp 1, in which, as shown in Fig. 24, a circular heat shielding plate 13 is provided between a filament 12 and a base 9 to use the base 9 as a coolest point and to prevent heat radiated from the filament 12 from transmitting to the base 9.
  • reference numeral 14 denotes lead wires
  • numeral 15 denotes supporting members for supporting the heat shielding plate 13. This arrangement is intended to avoid deterioration of its good-looking lamp as a product caused by blackening of phosphor coated on a glass tube in the vicinity of the filament.
  • the base 9 is set to have the coolest point to thereby suppress such blackening.
  • the shield is provided between the lead wire 14 and a stem 16, which is expected to suppress deposition of the above spattered substance onto the stem 16.
  • this arrangement has a problem that, since the heat shielding plate 13 is fixed to the lead wire 14 without any substantial gap therebetween, the above spattered substance deposits on the heat shielding plate, thus disabling prevention of short-circuiting between the pair of lead wires 14.
  • the inventors of the present application have examined the fluorescent lamp disclosed in the above citation fluorescent lamp 1 and found several problems that the lamp cannot exhibit sufficient effects of reducing generation of the above first and second operation modes and cannot be easily manufactured on a mass production basis, etc.
  • a problem common to the arrangements of Figs. 1 to 3' is that no consideration is paid to avoiding the first operation mode in these arrangements.
  • the first operation mode takes place for either one of the pair of lead wires, but in these arrangements, it is not clear in which lead wire the first operation mode occurs.
  • the citation fluorescent lamp 1 refers only to the fact that the recess, insulation tube and overhanging member are provided only for at least one of the lead wires in pair and fails to refer to the fact that they should be provided for both of the lead wires as its indispensable conditions. Such an arrangement cannot sufficiently cope with the first operation mode.
  • the insulator is provided so as to cover the sealing boundary areas of the glass stem with the lead wires or to cover the entire head area of the stem, spattering of substance from the filament onto the flare stem or sealing areas can be more sufficiently suppressed than the prior art and thus a probability of generating the second operation mode can be reduced. Furthermore, since the insulator is provided therein with first and second holes or is structured as mentioned above, even the substance deposits on the insulator, the deposit will not lead to formation of a short-circuited path between the pair of lead wires. This is because gaps defined between the holes and lead wires act to block the formation of the short-circuited path.
  • the first and second members are provided around the first and second lead wires, even when the first operation mode took place in either lead wire, the advancement of abnormal discharge can be suppressed.
  • the size of the hollow part of these members is selected sufficiently large when compared with the size or diameter of the lead wires, it has been confirmed that the provision of these members makes it difficult to maintain the above abnormal discharge. It has also been confirmed that, even when the discharge advances from the tip ends of the lead wires toward the flare stem, the provision of the members makes it difficult to maintain the discharge and the discharge stops short of reaching the members. It has also been confirmed that the absence of such members exhibits no such effect.
  • tubular members cover the sealing areas and have an inner diameter sufficiently large when compared with the diameter of the lead wires, formation of a short-circuited path between the lead wires can be blocked.
  • the second arrangement is featured in that the first and second members having the hollow part sufficiently larger than the cross-sectional area of the lead wires are employed by design. This enables sufficient reduction of a short-circuit probability between the lead wires. Even with the arrangement of Fig. 2, it seems (not disclosed) that the inner diameter of the tube is slightly larger than the diameter of the lead wires, but a difference therebetween is such small as enough to tightly fit the both.
  • Fig. 5A shows a cross-sectional view of one of ends (having stems for holding respective electrodes) of a fluorescent lamp in accordance with a first embodiment of the present invention
  • Fig. 5B shows a cross-sectional view of the same taken along line A-A in Fig. 5A
  • Fig. 5C shows a cross-sectional view of the same taken along line B-B in Fig. 5A
  • Fig. 6 is a perspective view of an entire straight fluorescent lamp having such an electrode structure as shown in Fig. 5 in the present embodiment.
  • a light emitting envelope 1 as a glass tube is formed on its inside wall with a phosphor film.
  • the light emitting envelope 1 is closed at its ends by respective flare stems 2 so that the interior of the envelope is sealed against outside the envelope. Passed through the flare stem 2 air-tightly are a pair of inner lead wires 3a and 3b each made of a nickel coated iron wire having a diameter of 0.6mm.
  • the inner lead wires 3a and 3b are provided at their one ends with a filament 4 made of tungsten. Coated on the filament 4 is emitter substance such as barium oxide.
  • an insulator (ceramic plate in this illustrated example) 5 which is formed therein with two holes of 1mm in diameter so as to cover an area of the stem between sealed parts of the pair of inner lead wires 3a and 3b.
  • the insulator 5 is loosely mounted on the stem so that, as the insulator goes toward the filament, a distance between the lead wires becomes larger.
  • the insulator 5 as a ceramic plate was made to have a nearly rectangular shape having a vertical dimension of 7mm, a horizontal dimension of 14mm and a thickness of 1mm, and made of alumina ceramic.
  • Fig. 7A is a perspective view of the ceramic plate, and Fig. 7B shows views as viewed from 3 sides of the plate.
  • Fig. 8 shows a perspective view of a flare stem part having the pair of lead wires inserted into the ceramic plate.
  • Fig. 9 shows steps of manufacturing a fluorescent lamp using the ceramic plate.
  • a stem 1 has a pair of inner lead wires 2a and 2b.
  • the pair of inner lead wires 2a and 2b are made substantially straight and passed through a ceramic or insulating plate 3 (refer to Fig. 9(a)).
  • the pair of intermediate lead wires are bent (refer to Fig. 9(c) and 9(d)). This bending enables limitation of the movement of the ceramic plate along the intermediate lead wires.
  • an electrode (filament) 4 is fixed to the lead wires (refer to Fig. 9(e)), thus forming a stem mount 5.
  • the stem mounts 5 prepared in this way are sealed inside a glass envelope 6 at both ends thereof, the envelope being coated on its inside wall with phosphor (refer to Fig. 9(f)).
  • the glass envelope is provided at its one end with an exhaust tube for discharging air inside the glass envelope.
  • a current is supplied to the electrode to activate carbonate such as barium carbonate coated on the electrode, a suitable amount of inactive gas is sealingly charged into the tube, a suitable amount of mercury is charged thereinto, and then the exhaust tube is cut and sealingly closed to thereby complete a fluorescent lamp (refer to Fig. 9(g)).
  • the lamp having such a structure was lighted as combined with a high frequency lighting ballast (high frequency lighting circuit) to confirm failure modes (that is,-the aforementioned first and second operation modes) of the lamp at the end of its life.
  • the confirmation was conducted through tests by coating the same amount of coat as its mass-production design value on one of the lamp electrodes and coating an excessively small amount of emitter substance on the other electrode to shorten a life end reproduction time. Further, for the purpose of observing the vicinities of the electrodes, such a glass envelope 6 was employed that the phosphor film on the inside wall of the envelope is not formed near the electrodes.
  • a prior art fluorescent lamp having substance already spattered from filaments and deposited on the tops of the stems at the end of its life was subjected to measurement of a resistance between the pair of lead wires.
  • the resistance was as very small as 50 to 200 ⁇ .
  • the lamp of the present embodiment was subjected to similar measurement of a resistance.
  • the resistance was substantially infinity.
  • the embodiment lamp can exhibit a sufficient effect of preventing the second operation mode. This is considered to be because the insulator is mounted as not fully fixed to the lead wires but as moved somewhat, so that the ceramic plate is partially contacted with the lead wires, that is, in a point contact relationship therebetween. For this reason, it is considered that establishment of an electric path is blocked. In other words, it can be considered that a gap between the ceramic plate and lead wires contributes to avoidance of the establishment of the electric path. On the contrary, when the ceramic plate is fully fixed to the lead wires, this may result in that an electric path is highly possibly established between the pair of lead wires.
  • the insulator has been made of alumina ceramic in the present embodiment, it can be made of, in addition to it, any material such as forsterite (2MgO ⁇ SiO 2 ), steatite (MgO ⁇ SiO 2 ) or jircon (ZrO 2 ⁇ SiO 2 )), so long as it is insulating ceramic.
  • the insulator further may be made of heat-resistive glass such as quartz glass or hard glass or made of mica.
  • the insulator may be made of any material so long as it is highly resistive to heat, stable, produces no impurity gas in vacuum, and more preferably, if it is excellent in processability.
  • the cross-sectional area of the hole is basically required to be only larger than the cross-sectional area of the inner lead wire.
  • the sectional area of the hole is preferably in a range of 1.2 to 10 times the sectional area of the inner lead wire.
  • the mountability becomes worse.
  • the ceramic plate produces a little strange sound, disadvantageously degrading its product value.
  • the cross-sectional area of the hole becomes too large, it is impossible to sufficiently block deposition of substance spattered to the vicinity of the lead wires, thus disabling sufficient suppression of the second operation mode.
  • a pitch between the two holes may be set to be nearly equal to a pitch between the lead wires.
  • the hole shape has been made circular in the present embodiment, it goes without saying that any other shape may be employed with substantially the same effects as in the above case.
  • the shape of the insulator has been made rectangular in the present embodiment, any shape may be employed so long as it can cover the entire head part of the stem.
  • the insulator shape may be made not plate-like but simply block-like.
  • a spacing 502 between a top 501 of the flare stem 2 upwardly projected and the insulator 5 provided to lead wires 3a and 3b is set to be desirably not smaller than 0mm and not larger than 5mm.
  • the spacing 502 between the top 501 of the flare stem 2 upwardly recessed and the insulator 5 provided to the lead wires 3a and 3b is set to be desirably not smaller than 0mm and not larger than 5mm.
  • the flare stem can have one of various sorts of shapes but the top of the flare stem and the insulator should be set to be desirably not smaller than 0mm and not larger than 5mm. In this case, the spacing of 0mm means that the top 501 of the flare stem 2 comes into contact with the insulator 5 provided to the lead wires 3a and 3b.
  • Fig. 10 Shown in Fig. 10 is another method for fixing the insulator 5 in the present embodiment.
  • the insulator 5 is provided therein with three holes which have a cross sectional area of 1.2 to 10 times as large as the cross-sectional area of the pair of inner lead wires 3a and 3b.
  • Fig. 11 shows its perspective view.
  • Fig. 12 shows steps of manufacturing a fluorescent lamp having such a structure as mentioned above.
  • Figs. 12(a) to 12(f) correspond to Figs. 9(a) to 9(f).
  • the steps of Fig. 12 are substantially the same as those of Fig. 9, except that a step is newly added for inserting the intermediate lead wire 6 into the associated hole and bending the wire.
  • Figs. 13A to 13C show a further method for fixing the insulator 5 in the present embodiment.
  • the insulator 5 is provided therein with two holes which have a sectional area of 1.2 to 10 times as large as the sectional area of the pair of inner lead wires 3a and 3b.
  • the pair of inner lead wires 3a and 3b are inserted into the two holes and the insulator 5 is held by stoppers 7a and 7b provided at halfway of the inner lead wires 3a and 3b.
  • the stoppers 7a and 7b are each made of a metal wire and fixed to the lead wires by welding.
  • metal wires have been used as the stoppers by welding in this example, any material other than the metal wires can be employed without any limitation, so long as it can restrict the movement of the insulator.
  • Fig. 14 is a perspective view of a flare stem part of the lamp shown in Fig. 13.
  • Fig. 15 shows steps of manufacturing a fluorescent lamp having such a structure as mentioned above, in which Fig. 15(a) to 15(e) correspond to Figs. 9(a) to 9(e).
  • the steps of Figs. 15(a) to 15(e) are substantially the same as those of Figs. 9(a) to 9(f), except that a step of fixing the stoppers is newly added.
  • Figs. 16 to 19 are diagrams for explaining a second embodiment of the present invention.
  • a tubular electrical insulator (which will also be sometimes referred to as the insulation tube, hereinafter) is used.
  • Fig. 16A is a perspective view of the insulation tube
  • Fig. 16B shows three views as viewed from three sides thereof.
  • each of the lead wires is inserted into each of the insulation tubes, which in turn are fixed by means of respective stoppers.
  • Fig. 17 shows its perspective view
  • Figs. 18A-18C show three views of a fluorescent lamp having the stem of Fig. 17.
  • Fig. 18A shows a cross-sectional view of an end (including the step for holding the electrode) of the fluorescent lamp
  • Fig. 18B is a cross-sectional view thereof taken along line A-A in Fig. 18A
  • Fig. 18C is a cross-sectional view thereof taken along line B-B in Fig. 18A.
  • a filament 4 is provided at one ends of a pair of lead wires 3a and 3b having a diameter of 0.6mm provided in the flare stem 2.
  • the filament 4 is coated with emitter substance such as barium oxide.
  • the pair of inner lead wires 3a and 3b as well as insulators 5a and 5b covering respective interface sealing parts of the stem with the lead wires.
  • the insulator was made in the form of a hollow cylinder having an inner diameter of 1mm, an outer diameter of 4mm and a height of 7mm.
  • These insulators 5a and 5b are loosely mounted by means of the stoppers 7a and 7b made of nickel wires at halfway of the respective lead wires.
  • Fig. 19 shows steps of manufacturing a fluorescent lamp having such a structure as mentioned above.
  • Figs. 19(a) to 19(e) correspond to Figs. 9(a) to 9(e).
  • the steps of Figs. 19(a) to 19(e) are substantially the same as those of Figs. 9(a) to 9(f), except that the fixing step is replaced by a step of inserting the insulation tubes and fixing the tubes by respective stoppers.
  • the insulators function to prevent the substance spattered from the electrode from being adhered to or deposited on the interface sealing parts of the stem with the pair of lead wires, the second operation mode did not take place. As a result of measuring a resistance between the both lead wires, it has been confirmed that the resistance was substantially infinity.
  • the sectional area of the hollow is optimumly in a range of 1.2 to 4 times the sectional area of the lead wire, and preferably in a range of 1.2 to 10 times.
  • the insulator has been made cylindrical in the present embodiment, any other ceramic plate 3-dimensional shape may be employed so long as it can cover the interface sealing parts of the stem with the lead wires.
  • a third embodiment of the present invention can be suitably applied to a discharge lamp including a glass envelope having an outer diameter of not smaller than 5mm and not larger than 33mm.
  • the envelope has a wall thickness of about 0.6mm to 0.7mm.
  • a glass envelope 1 is coated on its inner wall with phosphor 4.
  • An electrode 9 is fixedly mounted to a pair of lead wires 8.
  • the glass envelope has an outer diameter D and an inner diameter d.
  • the size of a stem 7 and the magnitude of a spacing d s between the lead wires at the tip end of the stem depend on the magnitude of the inner diameter of the glass envelope.
  • the inventors of the present application have found that, when the spacing d s between the lead wires is in a certain range, generation of the second operation mode can be avoided. When the spacing is narrowed to some extent, the creeping distance on the stem between the lead wires in pair becomes short. This tends to cause a short-circuiting, thus generating the second operation mode.
  • lamps using glass envelopes having outer diameters of not smaller than 5mm and not larger than 33mm and using stems with lead wires tend to easily cause the second operation mode.
  • FIG. 21 An example of the fluorescent lamp lighting circuit is shown in Fig. 21.
  • reference numeral 1 denotes an A.C. power source
  • numeral 2 denotes a rectifier circuit
  • 3 denotes a smoothing circuit
  • 4 denotes a high frequency inverter lighting circuit
  • 5 denotes a fluorescent lamp.
  • Fig. 22 shows an appearance of a fluorescent lamp device comprising a combination of the fluorescent lamp 1 in accordance with the embodiment of the present invention and a lighting fixture 2 incorporating such a lighting circuit as shown in Fig. 21.

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

Claims (9)

  1. Leuchtstofflampe mit einem Kolben (1), einem Fuß (2), der mit einem Paar von Leiterdrähten (3a, 3b) zur Versorgung einer Elektrode (4) versehen ist, und einem zwischen der Elektrode und dem Fuß angeordneten elektrisch isolierenden Bauteil (5) mit einem Paar von Löchern, durch die die Leiterdrähte verlaufen,
       dadurch gekennzeichnet, daß die Querschnittsfläche der Löcher größer ist als die der Leiterdrähte (3a, 3b), so daß zwischen der Lochbegrenzung und dem jeweiligen Leiterdraht ein Zwischenraum verbleibt.
  2. Lampe nach Anspruch 1, wobei das Verhältnis der Querschnittsfläche des Lochs, dividiert durch diejenige des Leiterdrahts (3a, 3b), nicht kleiner ist als 1,2 und nicht größer als 10, oder das Verhältnis des Lochdurchmessers, dividiert durch den Leiterdrahtdurchmesser, nicht kleiner ist als 1,1 und nicht größer als 3,3.
  3. Lampe nach Anspruch 1 oder 2, wobei die Leiterdrähte (3a, 3b) derart gebogen sind, daß ihr gegenseitiger Abstand mit zunehmender Entfernung von dem isolierenden Bauteil (5) größer wird.
  4. Lampe nach Anspruch 1 oder 2, wobei das isolierende Bauteil (5) an dem Fuß (2) mittels eines Drahtes (6) befestigt ist, der in ein in dem isolierenden Bauteil zwischen den beiden Löchern vorgesehenes Loch eingreift.
  5. Lampe nach Anspruch 1 oder 2, wobei das isolierende Bauteil (5) an den Leiterdrähten (3a, 3b) mittels an diesen befestigten Anschlagelementen (7a, 7b) gehalten ist.
  6. Lampe nach einem der vorhergehenden Ansprüche, wobei das isolierende Bauteil (5) plattenförmig ist und aus Keramik, Quarzglas und/oder Glimmer besteht.
  7. Lampe nach einem der vorhergehenden Ansprüche, wobei der Abstand zwischen der Oberseite des Fußes (2) und dem isolierenden Bauteil (5) nicht größer als 5 mm ist.
  8. Lampe nach einem der vorhergehenden Ansprüche, wobei der Kolben (1) einen Außendurchmesser hat, der nicht kleiner ist als 5 mm und nicht größer als 33 mm, vorzugsweise nicht kleiner als 13 mm und nicht größer als 29 mm.
  9. Leuchtstofflampengerät mit der Leuchtstofflampe nach einem der vorhergehenden Ansprüche und einer Hochfrequenzschaltung zum Beleuchten der Leuchtstofflampe.
EP98122236A 1997-12-16 1998-11-23 Fluoreszenzlampe Expired - Lifetime EP0924745B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP34609697 1997-12-16
JP34609697 1997-12-16
JP16466298A JP3527851B2 (ja) 1997-12-16 1998-06-12 蛍光ランプ、蛍光ランプの製造方法および蛍光ランプ装置
JP16466298 1998-06-12

Publications (3)

Publication Number Publication Date
EP0924745A2 EP0924745A2 (de) 1999-06-23
EP0924745A3 EP0924745A3 (de) 1999-07-14
EP0924745B1 true EP0924745B1 (de) 2003-11-12

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EP98122236A Expired - Lifetime EP0924745B1 (de) 1997-12-16 1998-11-23 Fluoreszenzlampe

Country Status (7)

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EP (1) EP0924745B1 (de)
JP (1) JP3527851B2 (de)
KR (1) KR100573608B1 (de)
CN (1) CN1118084C (de)
DE (1) DE69819669T2 (de)
ID (1) ID21460A (de)
TW (1) TW582620U (de)

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Publication number Priority date Publication date Assignee Title
US6486595B1 (en) * 2000-06-19 2002-11-26 Osram Sylvania Inc. Electric lamp having press seal configuration for exhaust tube protection
TW552611B (en) * 2001-03-29 2003-09-11 Toshiba Lighting & Technology Fluorescent lamp and lighting apparatus
JP4382681B2 (ja) 2005-02-03 2009-12-16 Ｎｅｃ液晶テクノロジー株式会社 液晶表示装置
JP2007026811A (ja) * 2005-07-14 2007-02-01 Nec Lighting Ltd 蛍光ランプ

Citations (2)

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Publication number Priority date Publication date Assignee Title
GB863468A (en) * 1957-09-16 1961-03-22 Gen Electric Co Ltd Improvements in or relating to low pressure electric discharge lamps
DE1539486A1 (de) * 1965-02-16 1969-10-16 Philips Nv Elektrische Gasentladungsroehre

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JPH0381950A (ja) * 1989-08-24 1991-04-08 Toshiba Lighting & Technol Corp けい光ランプ
US5298834A (en) * 1990-10-30 1994-03-29 Okaya Electric Industrial Co., Ltd. Display discharge lamp
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GB863468A (en) * 1957-09-16 1961-03-22 Gen Electric Co Ltd Improvements in or relating to low pressure electric discharge lamps
DE1539486A1 (de) * 1965-02-16 1969-10-16 Philips Nv Elektrische Gasentladungsroehre

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ID21460A (id) 1999-06-17
CN1220481A (zh) 1999-06-23
DE69819669T2 (de) 2004-09-30
KR100573608B1 (ko) 2006-11-30
EP0924745A3 (de) 1999-07-14
TW582620U (en) 2004-04-01
CN1118084C (zh) 2003-08-13
KR19990063033A (ko) 1999-07-26
EP0924745A2 (de) 1999-06-23
DE69819669D1 (de) 2003-12-18
JPH11238458A (ja) 1999-08-31
JP3527851B2 (ja) 2004-05-17

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