EP0392060A1 - Flash lamp - Google Patents

Flash lamp Download PDF

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Publication number
EP0392060A1
EP0392060A1 EP89106660A EP89106660A EP0392060A1 EP 0392060 A1 EP0392060 A1 EP 0392060A1 EP 89106660 A EP89106660 A EP 89106660A EP 89106660 A EP89106660 A EP 89106660A EP 0392060 A1 EP0392060 A1 EP 0392060A1
Authority
EP
European Patent Office
Prior art keywords
flash lamp
hard glass
lamp according
glass contains
cathode
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
EP89106660A
Other languages
German (de)
French (fr)
Other versions
EP0392060B1 (en
Inventor
Ingo Dipl.-Phys. Dünisch
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 Optoelectronics GmbH
Original Assignee
Heimann GmbH
Heimann Optoelectronics 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, Heimann Optoelectronics GmbH filed Critical Heimann GmbH
Priority to DE58908112T priority Critical patent/DE58908112D1/en
Priority to EP89106660A priority patent/EP0392060B1/en
Priority to US07/497,926 priority patent/US5091675A/en
Priority to JP1990038970U priority patent/JPH081555Y2/en
Publication of EP0392060A1 publication Critical patent/EP0392060A1/en
Application granted granted Critical
Publication of EP0392060B1 publication Critical patent/EP0392060B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/302—Vessels; Containers characterised by the material of the vessel
    • 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

Definitions

  • the invention relates to a flash lamp with two electrodes sealed in a gas-tight manner from tempered glass.
  • the photo market demands flash lamps with a shorter and shorter focal length and a smaller inner diameter in order to make cameras and flash devices more manageable without the light output and the service life of the flash lamp being allowed to decrease.
  • the energy density is limited by the following conditions: - The glass wall in the xenon arc evaporates; - The emitter substances evaporate on the cathode surface; - The oxide vaporization of the glass wall "poison" the cathode, ie they reduce its work function.
  • the invention has for its object to provide a flash lamp, the load capacity is increased compared to the prior art, i.e. which has a higher energy density compared to the known flash lamps.
  • composition of the hard glass is selected so that the components which evaporate during the discharge are at least partially They are emitter substances that reduce the work function at the cathode.
  • the easily evaporating components of the hard glass are deposited on the cathode without the energy density being reduced thereby. An increase is even possible.
  • a flash lamp is shown with a glass tube 1 made of tempered glass, at the ends of which an anode 2 and a cathode 3 are sealed in a gas-tight manner.
  • the interior 4 of the flash lamp is filled with xenon.
  • the cathode 3 is connected to a cathode body 5 and the anode 2 to an anode body 6.
  • tempered glasses of this type with up to 50 percent by weight of Cs2O, BaO and LaO allow a doubling of the energy density from about 0.5 wattsec per mm3 to about 1 wattsec per mm3, because these emitter substances condense on the cathode body 5 and there Reduce work function.

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  • Discharge Lamp (AREA)
  • Glass Compositions (AREA)

Abstract

In a flash lamp, it is intended to increase the energy density with respect to the prior art. The composition of the hard glass is selected such that its components which vaporise easily during the discharge are at least partially emitter materials which reduce the work function at the cathode body (5). <IMAGE>

Description

Die Erfindung betrifft eine Blitzlampe mit zwei in einem Glas­röhrchen aus Hartglas gasdicht eingeschmolzenen Elektroden.The invention relates to a flash lamp with two electrodes sealed in a gas-tight manner from tempered glass.

Der Photomarkt fordert Blitzlampen mit immer kürzerer Brenn­länge und kleinerem Innendurchmesser, um Kameras und Blitzge­räte handlicher zu machen, ohne daß die Lichtleistung und die Lebensdauer der Blitzlampe abnehmen darf. Mit den bisher für stabförmige Blitzlampen verwendeten Werkstoffen, nämlich Hart­glas für das Glasröhrchen und einer Kathode aus hochschmelzen­den Metallen mit einem Barium- oder Cäsium-Emitter, ist der Energiedichte eine Grenze gesetzt, die durch folgende Gegeben­heiten festgelegt ist:
- Die Glaswand im Xenon-Lichtbogen verdampft;
- die Emitterstoffe auf der Kathodenoberfläche verdampfen;
- die oxidischen Abdampfungen der Glaswand "vergiften" die Kathode, d.h. sie setzen deren Austrittsarbeit herab.The photo market demands flash lamps with a shorter and shorter focal length and a smaller inner diameter in order to make cameras and flash devices more manageable without the light output and the service life of the flash lamp being allowed to decrease. With the materials previously used for rod-shaped flash lamps, namely tempered glass for the glass tube and a cathode made of refractory metals with a barium or cesium emitter, the energy density is limited by the following conditions:
- The glass wall in the xenon arc evaporates;
- The emitter substances evaporate on the cathode surface;
- The oxide vaporization of the glass wall "poison" the cathode, ie they reduce its work function.

Die Verdampfungsprozesse sind grundsätzlich nicht zu verhindern, da das 7000 K heiße Plasma des Lichtbogens alle Festkörper verdampft.The evaporation processes cannot be prevented because the 7000 K plasma of the arc evaporates all solids.

Der Erfindung liegt die Aufgabe zugrunde, eine Blitzlampe zu schaffen, deren Belastbarkeit im Vergleich zum Stand der Tech­nik gesteigert ist, d.h. die eine im Vergleich zu den bekannten Blitzlampen höhere Energiedichte aufweist.The invention has for its object to provide a flash lamp, the load capacity is increased compared to the prior art, i.e. which has a higher energy density compared to the known flash lamps.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Zu­sammensetzung des Hartglases so gewählt ist, daß dessen bei der Entladung verdampfende Komponenten mindestens teilweise Emitterstoffe sind, die an der Kathode die Austrittsarbeit her­absetzen. Bei der erfindungsgemäßen Blitzlampe schlagen sich die leicht verdampfenden Komponenten des Hartglases auf der Kathode nieder, ohne daß dadurch die Energiedichte herabgesetzt wird. Es ist sogar eine Steigerung möglich.This object is achieved in that the composition of the hard glass is selected so that the components which evaporate during the discharge are at least partially They are emitter substances that reduce the work function at the cathode. In the flash lamp according to the invention, the easily evaporating components of the hard glass are deposited on the cathode without the energy density being reduced thereby. An increase is even possible.

Die Erfindung ist nachfolgend anhand der Zeichnung näher er­läutert.The invention is explained below with reference to the drawing.

In der Zeichnung ist eine Blitzlampe mit einem Glasröhrchen 1 aus Hartglas dargestellt, an dessen Enden eine Anode 2 und eine Kathode 3 gasdicht eingeschmolzen sind. Der Innenraum 4 der Blitzlampe ist mit Xenon gefüllt. Die Kathode 3 ist mit einem Kathodenkörper 5 und die Anode 2 mit einem Anodenkörper 6 ver­bunden.In the drawing, a flash lamp is shown with a glass tube 1 made of tempered glass, at the ends of which an anode 2 and a cathode 3 are sealed in a gas-tight manner. The interior 4 of the flash lamp is filled with xenon. The cathode 3 is connected to a cathode body 5 and the anode 2 to an anode body 6.

Im Hartglas des Glaskörpers 1 sind im Vergleich zum Stand der Technik ersetzt:
- Na₂O und K₂O durch Rb₂O, besser Cs₂O
- CaO durch SrO, besser BaO
- Al₂O₃ durch Sc,Y oder La-OxideIn the tempered glass of the glass body 1, the following are replaced in comparison to the prior art:
- Na₂O and K₂O through Rb₂O, better Cs₂O
- CaO by SrO, better BaO
- Al₂O₃ by Sc, Y or La oxides

Versuche haben gezeigt, daß Hartgläser dieser Art mit bis zu 50 Gewichtsprozenten von Cs₂O, BaO und LaO eine Verdoppelung der Energiedichte von etwa 0,5 Wattsec pro mm³ auf etwa 1 Wattsec pro mm³ ermöglichen, weil diese Emitterstoffe auf dem Kathoden­körper 5 kondensieren und dort die Austrittsarbeit herabsetzen.Experiments have shown that tempered glasses of this type with up to 50 percent by weight of Cs₂O, BaO and LaO allow a doubling of the energy density from about 0.5 wattsec per mm³ to about 1 wattsec per mm³, because these emitter substances condense on the cathode body 5 and there Reduce work function.

Claims (8)

1. Blitzlampe mit zwei in einem Glasröhrchen (1) aus Hartglas gasdicht eingeschmolzenen Elektroden (2, 3), dadurch gekennzeichnet, daß die Zusammensetzung des Hartglases so gewählt ist, daß dessen bei der Entladung ver­dampfende Komponenten mindestens teilweise Emitterstoffe sind, die an dem Kathodenkörper (5) die Austrittsarbeit herabsetzen.1. flash lamp with two in a glass tube (1) made of hard glass sealed gas-tight electrodes (2, 3), characterized in that the composition of the hard glass is selected so that its components which evaporate during discharge are at least partially emitter substances which are on the cathode body (5) reduce work function. 2. Blitzlampe nach Anspruch 1, dadurch gekenn­zeichnet, daß das Hartglas Cs₂O enthält.2. Flash lamp according to claim 1, characterized in that the hard glass contains Cs₂O. 3. Blitzlampe nach Anspruch 1 oder 2, dadurch ge­kennzeichnet, daß das Hartglas SrO enthält.3. flash lamp according to claim 1 or 2, characterized in that the hard glass contains SrO. 4. Blitzlampe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Hartglas BaO enthält.4. flash lamp according to one of claims 1 to 3, characterized in that the hard glass contains BaO. 5. Blitzlampe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Hartglas Sc enthält.5. flash lamp according to one of claims 1 to 4, characterized in that the hard glass contains Sc. 6. Blitzlampe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Hartglas Y enthält.6. flash lamp according to one of claims 1 to 5, characterized in that the hard glass contains Y. 7. Blitzlampe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Hartglas La-Oxide enthält.7. flash lamp according to one of claims 1 to 6, characterized in that the hard glass contains La-Oxide. 8. Blitzlampe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Hartglas Rb₂O enthält.8. flash lamp according to one of claims 1 to 7, characterized in that the hard glass contains Rb₂O.
EP89106660A 1989-04-14 1989-04-14 Flash lamp Expired - Lifetime EP0392060B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE58908112T DE58908112D1 (en) 1989-04-14 1989-04-14 Flash lamp.
EP89106660A EP0392060B1 (en) 1989-04-14 1989-04-14 Flash lamp
US07/497,926 US5091675A (en) 1989-04-14 1990-03-23 Flashbulb having hard glass containing emitter substances
JP1990038970U JPH081555Y2 (en) 1989-04-14 1990-04-11 Flash lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89106660A EP0392060B1 (en) 1989-04-14 1989-04-14 Flash lamp

Publications (2)

Publication Number Publication Date
EP0392060A1 true EP0392060A1 (en) 1990-10-17
EP0392060B1 EP0392060B1 (en) 1994-07-27

Family

ID=8201230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89106660A Expired - Lifetime EP0392060B1 (en) 1989-04-14 1989-04-14 Flash lamp

Country Status (4)

Country Link
US (1) US5091675A (en)
EP (1) EP0392060B1 (en)
JP (1) JPH081555Y2 (en)
DE (1) DE58908112D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1549113A1 (en) * 2002-09-30 2005-06-29 Huo Nang Development Co. Ltd. A starter for fluorescent lamp and a fluorescent lamp using the starter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006127865A (en) * 2004-10-27 2006-05-18 Matsushita Electric Ind Co Ltd Glow starter and its manufacturing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263379A1 (en) * 1986-10-06 1988-04-13 Heimann GmbH Flash lamp

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3525896A (en) * 1968-07-25 1970-08-25 Sanders Associates Inc Arc lamp envelopes
US3711787A (en) * 1971-03-10 1973-01-16 American Optical Corp Neodymium glass laser having room temperature output at wavelengths shorter than 1,060 nm
US3714059A (en) * 1971-03-10 1973-01-30 American Optical Corp Neodymium glass laser having room temperature output at wavelengths shorter than 1060 nm
US3997250A (en) * 1975-07-02 1976-12-14 American Optical Corporation High strength ophthalmic lens
US4042405A (en) * 1976-03-18 1977-08-16 American Optical Corporation High strength ophthalmic lens
US4097774A (en) * 1976-06-03 1978-06-27 Gte Sylvania Incorporated Arc discharge flash lamp and shielded cold cathode therefor
DE2729505C2 (en) * 1977-06-30 1985-05-23 Robert Bosch Gmbh, 7000 Stuttgart Ignition device for internal combustion engines
NL8302128A (en) * 1983-06-15 1985-01-02 Philips Nv LOW PRESSURE SODIUM VAPOR DISCHARGE LAMP.
JPS62206761A (en) * 1986-03-04 1987-09-11 Stanley Electric Co Ltd Flash discharging bulb
US4944784A (en) * 1989-11-03 1990-07-31 Alfred University Process for preparing a borosilicate glass

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263379A1 (en) * 1986-10-06 1988-04-13 Heimann GmbH Flash lamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 63 (E-585)[2910], 25. Februar 1988; & JP-A-62 206 761 (STANLEY ELECTRIC CO. LTD) 11-09-1987 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1549113A1 (en) * 2002-09-30 2005-06-29 Huo Nang Development Co. Ltd. A starter for fluorescent lamp and a fluorescent lamp using the starter
EP1549113A4 (en) * 2002-09-30 2007-05-16 Huo Nang Dev Co Ltd A starter for fluorescent lamp and a fluorescent lamp using the starter

Also Published As

Publication number Publication date
DE58908112D1 (en) 1994-09-01
JPH02133860U (en) 1990-11-07
US5091675A (en) 1992-02-25
EP0392060B1 (en) 1994-07-27
JPH081555Y2 (en) 1996-01-17

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