EP0269360A2 - Lampe à décharge à vapeur métallique - Google Patents

Lampe à décharge à vapeur métallique Download PDF

Info

Publication number: EP0269360A2
Authority: EP; European Patent Office
Prior art keywords: discharge lamp; vapour discharge; metal; heat sink; metal vapour
Prior art date: 1986-11-21
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

EP87310167A

Other languages

German (de)

English (en)

Other versions

EP0269360A3 (fr

EP0269360B1 (fr

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

Thorn EMI PLC

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.)

1986-11-21

Filing date

1987-11-18

Publication date

1988-06-01

1987-11-18 Application filed by GE Lighting Ltd, Thorn EMI PLC filed Critical GE Lighting Ltd

1988-06-01 Publication of EP0269360A2 publication Critical patent/EP0269360A2/fr

1990-06-13 Publication of EP0269360A3 publication Critical patent/EP0269360A3/fr

1996-10-23 Application granted granted Critical

1996-10-23 Publication of EP0269360B1 publication Critical patent/EP0269360B1/fr

2007-11-18 Anticipated expiration legal-status Critical

Status 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 metal vapour discharge lamp including an envelope, an exhaust, and a heat sink material in thermal contact with the exhaust for conducting heat away from the exhaust, 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 in thermal contact with 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 silicon compound, for transferring heat away from the envelope, bridges the exhaust tube 5 and the eyelet 1.
One suitable zinc oxide in silicon compound has thermal conductivity 0.712 Wm ⁇ 1 K ⁇ 1 and resistivity 2 ⁇ 1013 ⁇ 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.

Landscapes

Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Discharge Lamps And Accessories Thereof (AREA)
Vessels And Coating Films For Discharge Lamps (AREA)
Circuit Arrangements For Discharge Lamps (AREA)

EP87310167A 1986-11-21 1987-11-18 Lampe à décharge à vapeur métallique Expired - Lifetime EP0269360B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=10607753

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP87310167A Expired - Lifetime EP0269360B1 (fr)	1986-11-21	1987-11-18	Lampe à décharge à vapeur métallique

Country Status (4)

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

Family Cites Families (2)

* 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
DE3432675A1 (de) *	1984-09-05	1986-03-13	Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München	Kompakte niederdruckentladungslampe

1986
- 1986-11-21 GB GB868627934A patent/GB8627934D0/en active Pending
1987
- 1987-11-18 EP EP87310167A patent/EP0269360B1/fr not_active Expired - Lifetime
- 1987-11-18 AT AT87310167T patent/ATE144650T1/de not_active IP Right Cessation
- 1987-11-18 DE DE3751930T patent/DE3751930T2/de not_active Expired - Fee Related

Also Published As

Publication number	Publication date
ATE144650T1 (de)	1996-11-15
EP0269360A3 (fr)	1990-06-13
EP0269360B1 (fr)	1996-10-23
GB8627934D0 (en)	1986-12-31
DE3751930T2 (de)	1997-05-15
DE3751930D1 (de)	1996-11-28

Legal Events

Date	Code	Title	Description
1988-04-16	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
1988-06-01	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE
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1990-07-04	RHK1	Main classification (correction)	Ipc: H01J 61/52
1991-01-23	17P	Request for examination filed	Effective date: 19901128
1993-05-12	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: GE LIGHTING LIMITED
1993-08-04	17Q	First examination report despatched	Effective date: 19930622
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