EP0596676A1 - Lampe à décharge dans le sodium à haute pression - Google Patents

Lampe à décharge dans le sodium à haute pression Download PDF

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Publication number
EP0596676A1
EP0596676A1 EP93308699A EP93308699A EP0596676A1 EP 0596676 A1 EP0596676 A1 EP 0596676A1 EP 93308699 A EP93308699 A EP 93308699A EP 93308699 A EP93308699 A EP 93308699A EP 0596676 A1 EP0596676 A1 EP 0596676A1
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.)
Granted
Application number
EP93308699A
Other languages
German (de)
English (en)
Other versions
EP0596676B1 (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

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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
    • 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/cm2 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/cm2 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/cm2 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)
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 true EP0596676A1 (fr) 1994-05-11
EP0596676B1 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)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2092822A (en) * 1981-01-13 1982-08-18 Egyesuelt Izzolampa High Pressure Sodium Vapour Lamp
EP0443675A1 (fr) * 1990-02-21 1991-08-28 Koninklijke Philips Electronics N.V. Lampe à décharge dans la vapeur de sodium à haute pression

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2092822A (en) * 1981-01-13 1982-08-18 Egyesuelt Izzolampa High Pressure Sodium Vapour Lamp
EP0443675A1 (fr) * 1990-02-21 1991-08-28 Koninklijke Philips Electronics N.V. Lampe à décharge dans la vapeur de sodium à haute pression

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JJ. DE GROOT ET AL: "The High Pressure Sodium Lamp", 1986, KLUWER TECHNISCHE BOEKEN BV, DEVENTER, NL *

Also Published As

Publication number Publication date
JPH06203794A (ja) 1994-07-22
EP0596676B1 (fr) 1996-04-24
DE69302353D1 (de) 1996-05-30
DE69302353T2 (de) 1996-12-12

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