EP0269360B1 - Metalldampf-Entladungslampe - Google Patents

Metalldampf-Entladungslampe Download PDF

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Publication number
EP0269360B1
EP0269360B1 EP87310167A EP87310167A EP0269360B1 EP 0269360 B1 EP0269360 B1 EP 0269360B1 EP 87310167 A EP87310167 A EP 87310167A EP 87310167 A EP87310167 A EP 87310167A EP 0269360 B1 EP0269360 B1 EP 0269360B1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
vapour discharge
exhaust
heat sink
metal
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
EP87310167A
Other languages
English (en)
French (fr)
Other versions
EP0269360A2 (de
EP0269360A3 (de
Inventor
Victor Mark Smith
David Wynn Parlour
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.)
GE Lighting Ltd
Original Assignee
GE Lighting Ltd
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 GE Lighting Ltd filed Critical GE Lighting Ltd
Publication of EP0269360A2 publication Critical patent/EP0269360A2/de
Publication of EP0269360A3 publication Critical patent/EP0269360A3/de
Application granted granted Critical
Publication of EP0269360B1 publication Critical patent/EP0269360B1/de
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
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp
    • 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

Definitions

  • This invention is related to the provision of cool spots in metal vapour discharge lamps and particularly in fluorescent low pressure mercury vapour discharge lamps.
  • the light output of a fluorescent lamp depends to a great extent on the lamp loading, that is, the amount of power dissipated per unit area of the tube. If the current in a given lamp is increased, the voltage is lowered due to the negative voltage/current characteristic of the discharge and the power and lumen output are increased. However, the efficacy falls, partly because of increased cathode losses and partly because the mercury vapour pressure is increased due to higher bulb temperature which results in increased self-absorption of the resonance radiation.
  • a fluorescent lamp has a maximum light output and in a typical lamp this occurs when the temperature of the coolest part of the lamp is about 40°C. For many standard linear fluorescent lamps, this condition is closely approached in normal usage with ambient temperatures of the order of 25°C. At these temperatures the mercury vapour pressure is at an optimum for the generation of ultra-violet radiation at 253.7nm, but as the temperature increases the vapour pressure also increases, with detrimental results as described above.
  • lamps are required to run at temperatures higher than those required for maximum light output, especially when they are enclosed in luminaires.
  • a cooling tube is used.
  • a metal vapour discharge lamp including an envelope and an exhaust, wherein a heat sink material different from the material of the exhaust is in thermal contact with the exhaust and adapted, in use, to conduct heat away from the exhaust and thus from the envelope, thereby to control the vapour pressure in the lamp.
  • Such an arrangement allows the temperature of the exhaust, which acts as a cool spot, to be controlled.
  • the heat sink material prefferably be flexible.
  • the exhaust may be a substantially straight tube.
  • a method of constructing a metal vapour discharge lamp having an envelope and an exhaust including the step of placing a heat sink material different from the material of the exhaust in thermal contact with the exhaust in such a way that, in use, the heat sink material conducts heat away from the exhaust.
  • a metal eyelet 1 (made of, for example, brass, copper or aluminium) is assembled in the base 2 of an end cap 3, typically of a plastics material, covering, in this instance, both ends of a generally U-shaped lamp, having an envelope shown in part at 6.
  • the eyelet is a thermally conductive member.
  • a heat sink material 4 such as a zinc oxide in silicontcompound, for transferring heat away from the envelope, bridges the exhaust tube 5 and the eyelet 1.
  • One suitable zinc oxide in silicone compound has thermal conductivity 0.712 Wm -1 K -1 and resistivity 2 x 10 13 ⁇ m at 20°C.
  • the heat sink compound transfers heat to the eyelet which is located between pins 8 and 9, which are electrical connectors, mounted in the end cap.
  • Another heat sink material which may be used is metal filled epoxy resin.
  • FIG 2 shows an enlarged detail of Figure 1.
  • the heat sink material is exposed to the air via aperture 7 of the eyelet.
  • the heat sink material is preferably flexible. If this is so, greater tolerances on the assembly are allowable. Otherwise, movement of the glass exhaust tubing with respect to the cap may have to be taken into account and relative expansion of the various components as they heat up would have to be allowed for.
  • heat sink compound 4 is contained within a metal cap 10 which is set into the base 2 and contacts the eyelet 1 (as can be seen more clearly in Figure 4).
  • Figure 5 shows a lamp embodying the invention, having an envelope 6 and an exhaust tube 5 at one end of the envelope in thermal contact with a heat sink compound 4. An exhaust 11 at the other end of the envelope is shown sealed off.
  • the light output was found to peak at an ambient temperature of 32°C compared with 27°C for a lamp having a conventional straight tip.
  • the invention therefore allows highly loaded lamps to be used which run hotter than average and it may also be used where light fittings tend to run hot.
  • the metal vapour discharge lamp is a low pressure mercury vapour discharge lamp which may be a fluorescent lamp, but the invention also applies to other metal vapour discharge lamps.
  • a further advantage of the invention is that it does not require a special form of bend or join in the lamp envelope.

Claims (15)

  1. Metalldampf-Entladungslampe mit einem Mantel (6) und einem Auslaß (5), gekennzeichnet durch ein Wärmesenkenmaterial (4), das sich von dem Material des Auslasses (5) unterscheidet, in thermischem Kontakt mit dem Auslaß (5) und in der Lage ist, bei Benutzung Wärme von dem Auslaß (5) und somit von dem Mantel (6) wegzuleiten, um dadurch den Dampfdruck in der Lampe zu steuern.
  2. Metalldampf-Entladungslampe nach Anspruch 1, wobei der Auslaß (5) ein im wesentlichen gerades Rohr ist.
  3. Metalldampf-Entladungslampe nach Anspruch 1 oder Anspruch 2, wobei das Wärmesenkenmaterial (4) eine physikalische Wärmesenkenverbindung ist.
  4. Metalldampf-Entladungslampe nach Anspruch 3, wobei die physikalische Verbindung Zinkoxid in Silikon ist.
  5. Metalldampf-Entladungslampe nach einem der vorstehenden Ansprüche, wobei das Wärmesenkenmaterial (4) flexibel ist.
  6. Metalldampf-Entladungslampe nach einem der vorstehenden Ansprüche, wobei eine Endkappe (3) vorgesehen ist, von der der Auslaß (5) nicht ein Teil ist und die ein thermisch leitendes Teil (1) befestigt, wobei das Wärmesenkenmaterial (4) den Mantel (6) und das Teil (1) überbrückt.
  7. Metalldampf-Entladungslampe nach Anspruch 6, wobei das thermisch leitende Teil (1) eine Metallöse aufweist, wobei das Wärmesenkenmaterial (4) über eine Öffnung (7) in der Öse mit Luft in Kontakt ist.
  8. Metalldampf-Entladungslampe nach einem der Ansprüche 1 bis 5, wobei das Wärmesenkenmaterial (4) in einer Metallkappe enthalten ist.
  9. Metalldampf-Entladungslampe nach Anspruch 8, wobei eine Endkappe (3) vorgesehen ist, die ein thermisch leitendes Teil (1) befestigt und mit dem leitenden Teil (1) in thermischem Kontakt ist.
  10. Metalldampf-Entladungslampe nach Anspruch 9, wobei das leitende Teil (1) eine Metallöse ist.
  11. Metalldampf-Entladungslampe nach einem der Ansprüche 6 bis 10, wobei die Endkappe (3) wenigstens zwei elektrische Verbinder (8, 9) befestigt und das thermisch leitende Teil (1) zwischen den elektrischen Verbindern (8, 9) angeordnet ist.
  12. Metalldampf-Entladungslampe nach einem der vorstehenden Ansprüche, wobei die Lampe eine Niederdruck-Quecksilberdampf-Entladungslampe ist.
  13. Metalldampf-Entladungslampe nach Anspruch 12, wobei die Lampe eine Leuchtstofflampe ist.
  14. Verfahren zum Fertigen einer Metalldampf-Entladungslampe mit einem Mantel (6) und einem Auslaß (5), dadurch gekennzeichnet, daß das Verfahren den Schritt enthält, daß ein Wärmesenkenmaterial (4), das sich von dem Material des Auslasses (5) unterscheidet, in thermischem Kontakt mit dem Auslaß (5) derart angeordnet wird, daß bei Benutzung das Wärmesenkenmaterial (4) Wärme von dem Auslaß (5) wegleitet.
  15. Verfahren nach Anspruch 14, wobei eine Endkappe (3), von der der Auslaß (5) nicht ein Teil ist, an ein Ende des Mantels (6) angepaßt und das Wärmesenkenmaterial (4) angeordnet wird, indem es durch eine Öffnung (7) in der Endkappe (3) injiziert wird.
EP87310167A 1986-11-21 1987-11-18 Metalldampf-Entladungslampe Expired - Lifetime EP0269360B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868627934A GB8627934D0 (en) 1986-11-21 1986-11-21 Metal vapour discharge lamps
GB8627934 1986-11-21

Publications (3)

Publication Number Publication Date
EP0269360A2 EP0269360A2 (de) 1988-06-01
EP0269360A3 EP0269360A3 (de) 1990-06-13
EP0269360B1 true EP0269360B1 (de) 1996-10-23

Family

ID=10607753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87310167A Expired - Lifetime EP0269360B1 (de) 1986-11-21 1987-11-18 Metalldampf-Entladungslampe

Country Status (4)

Country Link
EP (1) EP0269360B1 (de)
AT (1) ATE144650T1 (de)
DE (1) DE3751930T2 (de)
GB (1) GB8627934D0 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936686A (en) * 1973-05-07 1976-02-03 Moore Donald W Reflector lamp cooling and containing assemblies
JPS52149883A (en) * 1976-06-08 1977-12-13 Mitsubishi Electric Corp Alkaline-metal-vapor discharge lamp
DE3432675A1 (de) * 1984-09-05 1986-03-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München Kompakte niederdruckentladungslampe

Also Published As

Publication number Publication date
EP0269360A2 (de) 1988-06-01
EP0269360A3 (de) 1990-06-13
DE3751930D1 (de) 1996-11-28
ATE144650T1 (de) 1996-11-15
DE3751930T2 (de) 1997-05-15
GB8627934D0 (en) 1986-12-31

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