EP0596676B1 - Lampe à décharge dans le sodium à haute pression - Google Patents

Lampe à décharge dans le sodium à haute pression Download PDF

Info

Publication number
EP0596676B1
EP0596676B1 EP19930308699 EP93308699A EP0596676B1 EP 0596676 B1 EP0596676 B1 EP 0596676B1 EP 19930308699 EP19930308699 EP 19930308699 EP 93308699 A EP93308699 A EP 93308699A EP 0596676 B1 EP0596676 B1 EP 0596676B1
Authority
EP
European Patent Office
Prior art keywords
discharge tube
discharge
lamp
pressure sodium
wall
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
EP19930308699
Other languages
German (de)
English (en)
Other versions
EP0596676A1 (fr
Inventor
Jack Mack Strok
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP0596676A1 publication Critical patent/EP0596676A1/fr
Application granted granted Critical
Publication of EP0596676B1 publication Critical patent/EP0596676B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/825—High-pressure sodium lamps

Definitions

  • This invention relates to high-pressure sodium discharge lamps for operation at low frequency, in particular for higher arc brightness at a color temperature between 1800 and 2250 K.
  • the lamp is provided with a sealed elongated light-transmitting discharge tube placed within an evacuated vitreous outer envelope, which surrounds the discharge tube and has electrical inleads and support members for supporting and making electrical connections from the base of the lamp to the discharge tube.
  • the discharge tube In the discharge tube there are electrodes arranged opposite to each other, and feedthroughs, which extend through the seal of the discharge tube, making electrical connections to the electrodes.
  • the discharge tube has fill materials comprising sodium in a quantity so as to achieve partial pressure at the operating temperature between 4 and 40 kPa in the inside of the discharge tube, and also comprising noble gas.
  • High-pressure sodium discharge lamps with higher brightness are valuable for improved beam performance in reflector lamp applications.
  • Low frequency operation means that the power supply of the lamp has components below 1 kHz in frequency.
  • the wall loading of a high-pressure sodium discharge tube in an evacuated outer envelope is limited to a value below 20 W/cm in the case of the so-called “standard” or “delux” operation which denominations cover a color temperature between 1800 and 2250 K and a color rendition index from 10 to 70.
  • Lamps of the standard kind are mentioned in the US Pat. No. 3,906,272.
  • the brightness is significantly limited by the permissible maximum wall loading since it is known that the increase of the wall loading, in general, raises the wall temperature of the discharge tube, and exceeding the maximum tube wall temperature results in shortened lamp life.
  • the object of the invention is to provide a high-pressure sodium discharge lamp of the kind mentioned in the field of the invention, the discharge tube of which can be operated with a wall loading higher than 24 W/cm in order to achieve higher brightness without taking any extra measures for the maintenance of the wall temperature below a permissible value.
  • the invention is based on the recognition that a higher wall loading can be used in case of the above lamp, if its discharge tube has a value for the ratio of the discharge gap (i.e. distance between the top of the electrodes) to the discharge tube inner diameter (D/d) lower than 5.0. It was found, that the heat conduction to the ends of the discharge tube significantly drops the center wall temperature, if the ratio D/d is less than 5.0, which recognition means that usual wall temperatures can be maintained also at higher values of wall loading.
  • the wall of the discharge tube is thicker, the above effect is more pronounced, and the most preferred values for the wall thickness of the discharge tube are more than 0.6 mm. It is to be mentioned that a discharge tube of polycrystalline alumina having a wall thickness of more than 3.0 mm is difficult to manufacture, and has relatively poor light transmission.
  • the most preferred range of the discharge tube inner diameter is between 3.5 and 7.0 mm, because it must be taken into account as well, that the efficiency of the discharge tube severely decreases if the inner diameter is smaller than 3.5 mm.
  • FIG. 1 A high-pressure sodium discharge lamp 1 embodying the invention in preferred form is illustrated in FIG. 1 and a discharge tube of this lamp in FIG. 2.
  • the high-pressure sodium discharge lamp 1 for operating at 90 Watts and 60 Hz frequency comprises a discharge tube 2 surrounded by a vitreous outer envelope 3, that ends in a standard screw base 10 for insertion into a socket by which the lamp 1 can be energized, and comprises furthermore a stem 15, which is sealed to the envelope 3. Electrical inleads 8, 9 extend through the stem 15, from the base 10 into the inside of the outer envelope 3, and are connected to support members 19, 20 that supply current to the discharge tube 2 and provide for its fixed position within the lamp 1.
  • the outer envelope 3 is evacuated by pumping and flashing getter rings 11, 12, 13, 14.
  • the discharge tube 2 has a cylindrical wall 18 made of sintered aluminum oxide which has a thickness, w, of 0.76 mm, a length, L, of 35 mm and an inner diameter, d, of 4.0 mm.
  • the discharge tube 2 there are two electrodes 6, 7, opposite to each other.
  • the distance D between the tips of the electrodes 6, 7, i.e. the discharge gap is 16 mm.
  • the cylindrical wall 18 is closed at its two ends by means of sintered aluminum oxide plugs 16, 17.
  • feedthroughs 4, 5 extend through the plugs 16, 17 and make electrical connection to the electrodes 6, 7.
  • the feedthrough 5 is a niobium wire, while the feedthrough 4 is a niobium tube through which the discharge tube 2 is exhausted during manufacturing.
  • the plugs 16, 17 are sealed to the cylindrical wall 18 and the feedthroughs 4, 5 to the plugs 16, 17 by means of seal glass.
  • the described discharge tube 2 has fill materials comprising sodium, furthermore xenon gas.
  • the partial pressure of the sodium is between 4 and 40 kPa at the operating temperature of the discharge tube.
  • the sodium can be dosed into the discharge tube 2 in form of sodium-mercury amalgam, in a quantity of 17 mg.
  • the ratio of the sodium in the amalgam is 17 % by weight.
  • the pressure of the xenon gas is 2.5 kPa at 300 K.
  • FIG. 3 shows some experimental data on the discharge tube wall loading for a maximum wall temperature 1200 C at various discharge tube inner diameter values.
  • the data relates to the case of 0.76 mm wall thickness.
  • the diagrams show that a higher value for the wall loading can be achieved at smaller values of the ratio D/d, and furthermore that this trend increases in the case of smaller discharge tube inner diameter.
  • the above described lamp construction and operation results in the following:
  • the color temperature of the lamp is 2000 K, the color rendition index is 20.
  • the achieved wall loading is 40 W/cm at a wall temperature of 1200 C.
  • the invention provides a solution for a high-pressure sodium discharge lamp of low color temperature having an evacuated outer envelope in order to achieve higher brightness without the increase of the wall temperature over conventional discharge tube designs with values of the ratio D/d more than 5.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Discharge Lamp (AREA)

Claims (3)

  1. Lampe à décharge dans le sodium à haute pression destinée à fonctionner à basse fréquence, comprenant :
    - un tube à décharge (2), allongé et transmettant la lumière, comportant des extrémités scellées (16, 17),
    - des électrodes (6, 7) placées dans ledit tube à décharge en vis-à-vis l'une de l'autre,
    - des traversées (4, 5) servant à réaliser des connexions électriques avec lesdites électrodes et s'étendant à l'extérieur du scellement du tube à décharge,
    - des matériaux de remplissage placés à l'intérieur du tube à décharge, comprenant du sodium en une quantité qui donne, à la température de fonctionnement dudit tube à décharge, une pression partielle comprise entre 4 et 40 kPa, et comprenant en outre un gaz rare,
    - une ampoule extérieure (3) en verre, dans laquelle on a fait le vide, qui entoure ledit tube à décharge et comporte des conducteurs électriques d'entrée (8, 9) et des éléments de support (19, 20) pour soutenir lesdites électrodes dudit tube à décharge et réaliser des connexions électriques avec elles,
    ledit tube à décharge émettant en fonctionnement une lumière avec une température de couleur comprise entre 1800 et 2250 K, une charge de paroi d'au moins 24 W/cm et une valeur du rapport entre l'intervalle de décharge et le diamètre intérieur du tube à décharge inférieure à 5,0.
  2. Lampe à décharge dans le sodium à haute pression selon la revendication 1, dans laquelle ledit tube à décharge a une épaisseur de paroi supérieure à 0,6 mm.
  3. Lampe à décharge dans le sodium à haute pression selon la revendication 1, dans laquelle le diamètre intérieur dudit tube à décharge est compris entre 3,5 et 7,0 mm.
EP19930308699 1992-11-02 1993-11-01 Lampe à décharge dans le sodium à haute pression Expired - Lifetime EP0596676B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US97051092A 1992-11-02 1992-11-02
US970510 1997-11-14

Publications (2)

Publication Number Publication Date
EP0596676A1 EP0596676A1 (fr) 1994-05-11
EP0596676B1 true EP0596676B1 (fr) 1996-04-24

Family

ID=25517060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930308699 Expired - Lifetime EP0596676B1 (fr) 1992-11-02 1993-11-01 Lampe à décharge dans le sodium à haute pression

Country Status (3)

Country Link
EP (1) EP0596676B1 (fr)
JP (1) JPH06203794A (fr)
DE (1) DE69302353T2 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU181262B (en) * 1981-01-13 1983-06-28 Egyesuelt Izzolampa Sodium vapour lamp of high pressure
US5153482A (en) * 1990-02-21 1992-10-06 U.S. Philips Corporation High-pressure sodium discharge lamp

Also Published As

Publication number Publication date
JPH06203794A (ja) 1994-07-22
DE69302353D1 (de) 1996-05-30
DE69302353T2 (de) 1996-12-12
EP0596676A1 (fr) 1994-05-11

Similar Documents

Publication Publication Date Title
US6833677B2 (en) 150W-1000W mastercolor ceramic metal halide lamp series with color temperature about 4000K, for high pressure sodium or quartz metal halide retrofit applications
JP3825009B2 (ja) メタルハライドランプ
US5708328A (en) Universal burn metal halide lamp
US4970431A (en) High-pressure sodium discharge lamp with fins radially extending from the discharge vessel for controlling the wall temperature of the discharge vessel
JP2005531116A (ja) セラミック・メタル・ハライド・ランプ用のコイル・アンテナ／保護
JP2008053237A (ja) メタルハライドランプ
US6844676B2 (en) Ceramic HID lamp with special frame wire for stabilizing the arc
EP0720209B1 (fr) Lampes à décharge
JP2004288617A (ja) 高圧放電ランプおよび照明装置
JPH11126580A (ja) 小型投射ランプ
JP2004528694A (ja) セラミックメタルハライドランプ
JP2004349242A (ja) 高圧放電ランプおよび照明装置
EP0596676B1 (fr) Lampe à décharge dans le sodium à haute pression
EP0173235B1 (fr) Lampe à halogénure métallique à basse puissance
US4910433A (en) Emitterless SDN electrode
US20030025455A1 (en) Ceramic HID lamp with special frame for stabilizing the arc
JP2003272560A (ja) メタルハライドランプ
JP3271946B2 (ja) メタルハライドランプ
JP2586682B2 (ja) 片封止形金属蒸気放電灯
EP0163301A2 (fr) Disposition des électrodes dans des lampes métal-halogène
JPH09237607A (ja) セラミックス放電ランプ，点灯装置，照明器具および照明装置
JP2000149874A (ja) 高圧放電ランプおよび照明装置
JPH0997590A (ja) セラミックス放電ランプ、点灯装置および照明装置
JPH08250065A (ja) セラミックス放電灯およびその点灯装置，ならびに照明装置
JP2000149867A (ja) 放電ランプ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19941111

17Q First examination report despatched

Effective date: 19950718

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19960424

ET Fr: translation filed
REF Corresponds to:

Ref document number: 69302353

Country of ref document: DE

Date of ref document: 19960530

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19970731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970801

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19971101