EP0325157A1 - Gas discharge lamp - Google Patents

Gas discharge lamp Download PDF

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Publication number
EP0325157A1
EP0325157A1 EP89100424A EP89100424A EP0325157A1 EP 0325157 A1 EP0325157 A1 EP 0325157A1 EP 89100424 A EP89100424 A EP 89100424A EP 89100424 A EP89100424 A EP 89100424A EP 0325157 A1 EP0325157 A1 EP 0325157A1
Authority
EP
European Patent Office
Prior art keywords
glass tube
gas discharge
discharge lamp
less
diameter
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.)
Granted
Application number
EP89100424A
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German (de)
French (fr)
Other versions
EP0325157B1 (en
Inventor
Ingo Dipl.-Phys. Dünisch
Rudolf Zartner
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.)
Heimann GmbH
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Heimann GmbH
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
Application filed by Heimann GmbH filed Critical Heimann GmbH
Publication of EP0325157A1 publication Critical patent/EP0325157A1/en
Application granted granted Critical
Publication of EP0325157B1 publication Critical patent/EP0325157B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01J61/80—Lamps suitable only for intermittent operation, e.g. flash lamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting

Definitions

  • the invention relates to a gas discharge lamp, in particular a flash tube.
  • flash tubes are required that emit less light than conventional flash tubes intended for exposing a film, but have a constant light output for a few milliseconds. They must therefore have a high internal resistance.
  • a high internal resistance can be achieved through a long burning length, a small internal diameter and a high filling pressure.
  • a long focal length is not an option with an "electronic still camera” due to the installation dimensions.
  • a high filling pressure is ruled out because of the ignition problem.
  • the invention is therefore based on the object to provide a gas discharge lamp which is particularly suitable for an "electronic still camera” by reducing the inner diameter and other design measures.
  • the measures described allow miniaturization of the gas discharge lamp and thus installation in a very small camera.
  • a further development of the invention consists in that a series ignition circuit with an ignition transformer and an ignition capacitor is provided, in which the ignition capacitor is preferably blocked by a diode. This circuit allows miniaturization of the electronic components.
  • the gas discharge lamp shown in FIG. 1 has a glass tube 1, at the ends of which electrodes 2 are fused.
  • the inner diameter of the glass tube 1 is less than 2 mm, preferably less than 1 mm.
  • Tinnable plates 3 are attached to the outside of the electrodes 2, the diameter of which is smaller than or equal to the diameter of the glass tube 1 and which carry a soft solder layer 4 for soldering on the connecting wire.
  • the thickness of the glass tube wall is less than 0.5 mm, preferably less than 0.3 mm.
  • the glass tube 1 consists of a material that can withstand higher loads than the glass usually used for flash tubes (tungsten melting glass). For example, Quartz glass or pyrex glass
  • Molybdenum foils for igniting the lamp can be melted in the glass tube 1.
  • the ignition circuit according to FIG. 2 shows a flash lamp 5 according to FIG. 1, via which a flash capacitor C1 discharges via a diode 6.
  • the tube 5 is ignited by an ignition transformer 7 via a capacitor C2.
  • the circuit according to FIG. 2 is a series ignition with blocking by the diode 6 in the main discharge circuit.
  • FIG. 3 again shows the flash lamp 5 in connection with an ignition transformer 7a and a flash capacitor C1a.
  • This circuit is a classic series ignition.
  • FIG. 4 also shows a transparent ignition layer 9 on the glass tube 1a.
  • the flanges 8 can be formed from the glass of the glass tube 1a but also from separate plastic rings.

Abstract

It is intended to produce a gas discharge lamp, especially a flash tube, which is suitable for triggering electronic still cameras, that is to say, which is miniaturised and has a high internal resistance. The gas discharge lamp is characterised by the following features: a) the internal diameter of the glass tube (1) is less than 2 mm, b) a small plate (3), which can be tinned, is mounted externally on the electrode wires (2) which are fused into the glass tube (1), the small plate (3) having a diameter which is less than or equal to the external diameter of the glass tube (1) and carrying a soft solder layer (4), c) the thickness of the glass tube wall is less than 0.5 mm, d) the glass tube (1) consists of glass which can be subjected to high stress.

Description

Die Erfindung betrifft eine Gasentladungslampe, insbesondere eine Blitzröhre.The invention relates to a gas discharge lamp, in particular a flash tube.

Für sogenannte "Elektronic-Still-Cameras", also Fotokameras mit lichtelektrischen Sensoren anstelle eines Films, werden Blitz­röhren benötigt, die weniger Licht abgeben als herkömmliche, für die Belichtung eines Filmes vorgesehene Blitzröhren, aber dafür einige Millisekunden lang eine konstante Lichtabgabe ha­ben. Sie müssen deshalb einen hohen Innenwiderstand aufweisen.For so-called "electronic still cameras", ie photo cameras with photoelectric sensors instead of a film, flash tubes are required that emit less light than conventional flash tubes intended for exposing a film, but have a constant light output for a few milliseconds. They must therefore have a high internal resistance.

Ein hoher Innenwiderstand kann durch eine lange Brennlänge, ei­nen kleinen Innendurchmesser und einen hohen Fülldruck erzielt werden. Eine lange Brennlänge kommt bei einer "Elektronic-­Still-Camera" wegen der Einbaumaße nicht in Frage. Ein hoher Fülldruck scheidet wegen der Zündproblematik aus.A high internal resistance can be achieved through a long burning length, a small internal diameter and a high filling pressure. A long focal length is not an option with an "electronic still camera" due to the installation dimensions. A high filling pressure is ruled out because of the ignition problem.

Der Erfindung liegt demgemäß die Aufgabe zugrunde, eine Gasent­ladungslampe zu schaffen, die durch Verkleinerung des Innen­durchmessers und weitere konstruktive Maßnahmen speziell für eine "Elektronic-Still-Camera" geeignet ist.The invention is therefore based on the object to provide a gas discharge lamp which is particularly suitable for an "electronic still camera" by reducing the inner diameter and other design measures.

Diese Aufgabe ist erfindungsgemäß gelöst durch folgende Merk­male:

  • a) der Innendurchmesser des Glasrohres ist kleiner als 2 mm,
  • b) auf dem im Glasrohr eingeschmolzenen Elektrodendraht ist außen ein verzinnbares Plättchen befestigt, dessen Durch­messer kleiner oder gleich dem Außendurchmesser des Glas­rohres ist und das eine Weichlotschicht trägt,
  • c) die Dicke der Glasrohrwand ist kleiner als 0,5 mm,
  • d) das Glasrohr besteht aus hochbelastbarem Glas.
This object is achieved according to the invention by the following features:
  • a) the inner diameter of the glass tube is less than 2 mm,
  • b) on the electrode wire melted in the glass tube, a tin plate which can be tinned is attached on the outside, the diameter of which is smaller than or equal to the outside diameter of the glass tube and which carries a soft solder layer,
  • c) the thickness of the glass tube wall is less than 0.5 mm,
  • d) the glass tube consists of heavy-duty glass.

Durch die geschilderten Maßnahmen ist eine Miniaturisierung der Gasentladungslampe und damit der Einbau in eine sehr kleine Kamera möglich.The measures described allow miniaturization of the gas discharge lamp and thus installation in a very small camera.

Eine Weiterbildung der Erfindung besteht darin, daß ein Serien­zündkreis mit einem Zündtransformator und einem Zündkondensator vorgesehen ist, bei dem der Zündkondensator vorzugsweise durch eine Diode abgeblockt ist. Diese Schaltung erlaubt eine Minia­turisierung der elektronischen Komponenten.A further development of the invention consists in that a series ignition circuit with an ignition transformer and an ignition capacitor is provided, in which the ignition capacitor is preferably blocked by a diode. This circuit allows miniaturization of the electronic components.

Die Erfindung ist nachfolgend anhand der Zeichnung näher er­läutert. Es zeigen:

  • Fig. 1 das eine Ende einer Gasentladungslampe nach der Erfin­dung,
  • Fif. 2 und 3 zwei Varianten einer Zündschaltung für die Gasent­ladungslampe nach Fig. 1, und
  • Fig. 4 eine Variante der Gasentladungslampe gemäß Fig. 1.
The invention is explained below with reference to the drawing. Show it:
  • 1 the one end of a gas discharge lamp according to the invention,
  • Fif. 2 and 3 two variants of an ignition circuit for the gas discharge lamp according to FIG. 1, and
  • 4 shows a variant of the gas discharge lamp according to FIG. 1.

Die in der Fig. 1 dargestellte Gasentladungslampe weist ein Glasrohr 1 auf, an dessen Enden Elektroden 2 eingeschmolzen sind. Der Innendurchmesser des Glasrohres 1 ist kleiner als 2 mm, vorzugsweise kleiner als 1 mm. Auf den Elektroden 2 sind außen zerzinnbare Plättchen 3 befestigt, deren Durchmesser kleiner oder gleich dem Durchmesser des Glasrohres 1 ist und die eine Weichlotschicht 4 zum Anlöten des Anschlußdrahtes tra­gen. Die Dicke der Glasrohrwand ist kleiner als 0,5 mm, vor­zugsweise kleiner als 0,3 mm. Das Glasrohr 1 besteht aus einem Material, das höher belastbar ist als das üblicherweise für Blitzröhren verwendete Glas (Wolfram-Einschmelzglas). In Frage kommt z.B. Quarzglas oder PyrexglasThe gas discharge lamp shown in FIG. 1 has a glass tube 1, at the ends of which electrodes 2 are fused. The inner diameter of the glass tube 1 is less than 2 mm, preferably less than 1 mm. Tinnable plates 3 are attached to the outside of the electrodes 2, the diameter of which is smaller than or equal to the diameter of the glass tube 1 and which carry a soft solder layer 4 for soldering on the connecting wire. The thickness of the glass tube wall is less than 0.5 mm, preferably less than 0.3 mm. The glass tube 1 consists of a material that can withstand higher loads than the glass usually used for flash tubes (tungsten melting glass). For example, Quartz glass or pyrex glass

Im Glasrohr 1 können Molybdänfolien zur Zündung der Lampe ein­geschmolzen sein.Molybdenum foils for igniting the lamp can be melted in the glass tube 1.

Die Zündschaltung gemäß Fig. 2 zeigt eine Blitzlampe 5 gemäß Fig. 1, über die sich ein Blitzkondensator C1 über eine Diode 6 entlädt. Die Zündung der Röhre 5 erfolgt von einem Zündtrans­formator 7 über einen Kondensator C2. Bei der Schaltung gemäß Fig. 2 handelt es sich um eine Serienzündung mit Abblockung durch die Diode 6 im Hauptentladungskreis.The ignition circuit according to FIG. 2 shows a flash lamp 5 according to FIG. 1, via which a flash capacitor C1 discharges via a diode 6. The tube 5 is ignited by an ignition transformer 7 via a capacitor C2. The circuit according to FIG. 2 is a series ignition with blocking by the diode 6 in the main discharge circuit.

Die Fig. 3 zeigt wieder die Blitzlampe 5 in Verbindung mit ei­nem Zündtransformator 7a und einem Blitzkondensator C1a. Bei dieser Schaltung handelt es sich um eine klassische Serien­zündung.3 again shows the flash lamp 5 in connection with an ignition transformer 7a and a flash capacitor C1a. This circuit is a classic series ignition.

Bei der Ausführungsorm gemäß Fig. 4 sind im Hinblick auf Fig. 1 gleiche Teile mit gleichen Bezugszeichen bezeichnet. Das Glasrohr 1a weist an seinen Stirnseiten Flansche 8 auf, deren Außendurchmesser größer als der Außendurchmesser des Glasrohres 1a ist. Dadurch ist bei guter Isolation eine besonders kurze Stromzuführung möglich. In der Fig. 4 ist noch eine transparen­te Zündschicht 9 auf dem Glasrohr 1a dargestellt.In the embodiment according to FIG. 4, identical parts are designated with the same reference symbols with regard to FIG. The glass tube 1a has on its end faces flanges 8, the outer diameter of which is larger than the outer diameter of the glass tube 1a. With good insulation, a particularly short power supply is possible. FIG. 4 also shows a transparent ignition layer 9 on the glass tube 1a.

Die Flansche 8 können vom Glas des Glasrohres 1a aber auch von separaten Kunststoffringen gebildet sein.The flanges 8 can be formed from the glass of the glass tube 1a but also from separate plastic rings.

Claims (7)

1. Gasentladungslampe, insbesondere Blitzröhre, gekenn­zeichnet durch folgende Merkmale: a) der Innendurchmesser des Glasrohres (1, 1a) ist kleiner als 2 mm, b) auf den im Glasrohr (1, 1a) eingeschmolzenen Elektrodendräh­ten (2) ist außen ein verzinnbares Plättchen (3) befestigt, dessen Durchmesser kleiner oder gleich dem Außendurchmesser des Glasrohres (1, 1a) ist und das eine Weichlotschicht (4) trägt, c) die Dicke der Glasrohrwand ist kleiner als 0,5 mm, d) das Glasrohr (1, 1a) besteht aus hochbelastbarem Glas. 1. Gas discharge lamp, in particular flash tube, characterized by the following features: a) the inside diameter of the glass tube (1, 1a) is less than 2 mm, b) on the electrode wires (2) melted in the glass tube (1, 1a), a tin plate (3) is attached on the outside, the diameter of which is less than or equal to the outside diameter of the glass tube (1, 1a) and which carries a soft solder layer (4), c) the thickness of the glass tube wall is less than 0.5 mm, d) the glass tube (1, 1a) consists of heavy-duty glass. 2. Gasentladungslampe nach Anspruch 1, dadurch ge­kennzeichnet, daß der Innendurchmesser des Glas­rohres (1, 1a) kleiner als 1,5 mm ist.2. Gas discharge lamp according to claim 1, characterized in that the inner diameter of the glass tube (1, 1a) is less than 1.5 mm. 3. Gasentladungslampe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dicke der Glasrohrwand kleiner als 0,3 mm ist.3. Gas discharge lamp according to claim 1 or 2, characterized in that the thickness of the glass tube wall is less than 0.3 mm. 4. Gasentladungslampe nach einem der Ansprüche 1 bis 3, da­durch gekennzeichnet, daß an den Enden des Glasrohres (1a) Flansche (8) aus Isoliermaterial vorgesehen sind, deren Durchmesser größer als der Außendurchmesser des Glasrohres (1a) ist.4. Gas discharge lamp according to one of claims 1 to 3, characterized in that at the ends of the glass tube (1a) flanges (8) made of insulating material are provided, the diameter of which is larger than the outer diameter of the glass tube (1a). 5. Gasentladungslampe nach einem der Ansprüche 1 bis 4, da­durch gekennzeichnet, daß im Glasrohr (1, 1a) eine Molybdänfolie eingeschmolzen ist und das Glasrohr (1, 1a) aus Quarzglas besteht.5. Gas discharge lamp according to one of claims 1 to 4, characterized in that a molybdenum foil is melted in the glass tube (1, 1a) and the glass tube (1, 1a) consists of quartz glass. 6. Gasentladungslampe nach einem der Ansprüche 1 bis 5, da­durch gekennzeichnet, daß ein Serienzünd­kreis mit einem Zündtransformator (7), einer Diode 6 in Reihe mit einem Zündkondensator (1) und einem Potentialtrennungskon­densator (C₂) vorgesehen ist.6. Gas discharge lamp according to one of claims 1 to 5, characterized in that a series ignition circuit with an ignition transformer (7), a diode 6 in series with an ignition capacitor (1) and a potential separation capacitor (C₂) is provided. 7. Gasentladungslampe nach einem der Ansprüche 1 bis 5, da­durch gekennzeichnet, daß eine Serien­zündung mit einem Zündtransformator (7a) in Reihe mit einem Zündkondensator (1a) vorgesehen ist.7. Gas discharge lamp according to one of claims 1 to 5, characterized in that a series ignition with an ignition transformer (7a) is provided in series with an ignition capacitor (1a).
EP89100424A 1988-01-20 1989-01-11 Gas discharge lamp Expired - Lifetime EP0325157B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8800632U DE8800632U1 (en) 1988-01-20 1988-01-20
DE8800632U 1988-01-20

Publications (2)

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EP0325157A1 true EP0325157A1 (en) 1989-07-26
EP0325157B1 EP0325157B1 (en) 1991-10-23

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EP89100424A Expired - Lifetime EP0325157B1 (en) 1988-01-20 1989-01-11 Gas discharge lamp

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EP (1) EP0325157B1 (en)
JP (1) JPH01176360U (en)
KR (1) KR890012352A (en)
DE (2) DE8800632U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924747A2 (en) * 1997-12-16 1999-06-23 Fuji Photo Film Co., Ltd. Flash discharge tube and method for producing the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB435527A (en) * 1933-12-19 1935-09-23 British Thomson Houston Co Ltd Improvements in and relating to electric lamps or the like
EP0031556A1 (en) * 1979-12-27 1981-07-08 COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL S.A. dite: Illumination source for line scanning of a document
DE8390086U1 (en) * 1983-08-12 1985-11-21 Heimann Gmbh, 6200 Wiesbaden Wall-stabilized infrared flash tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB435527A (en) * 1933-12-19 1935-09-23 British Thomson Houston Co Ltd Improvements in and relating to electric lamps or the like
EP0031556A1 (en) * 1979-12-27 1981-07-08 COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL S.A. dite: Illumination source for line scanning of a document
DE8390086U1 (en) * 1983-08-12 1985-11-21 Heimann Gmbh, 6200 Wiesbaden Wall-stabilized infrared flash tube

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LIGHT & LIGHTING, Band 63, Nr. 6, Juni 1970, Seiten 146-151; E.J.G. BEESON et al.: "New metal halide discharge lamps and their uses" *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 194 (E-264)[1631], 6. September 1984, Seite 34 E 264; & JP-A-59 81 855 (FUJI SHASHIN FILM K.K.) 11-05-1984 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924747A2 (en) * 1997-12-16 1999-06-23 Fuji Photo Film Co., Ltd. Flash discharge tube and method for producing the same
EP0924747A3 (en) * 1997-12-16 2000-01-12 Fuji Photo Film Co., Ltd. Flash discharge tube and method for producing the same

Also Published As

Publication number Publication date
DE8800632U1 (en) 1989-05-18
KR890012352A (en) 1989-08-25
DE58900384D1 (en) 1991-11-28
JPH01176360U (en) 1989-12-15
EP0325157B1 (en) 1991-10-23

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