EP0192290B1 - Lampe électrique à ampoule colorée - Google Patents

Lampe électrique à ampoule colorée Download PDF

Info

Publication number
EP0192290B1
EP0192290B1 EP19860200141 EP86200141A EP0192290B1 EP 0192290 B1 EP0192290 B1 EP 0192290B1 EP 19860200141 EP19860200141 EP 19860200141 EP 86200141 A EP86200141 A EP 86200141A EP 0192290 B1 EP0192290 B1 EP 0192290B1
Authority
EP
European Patent Office
Prior art keywords
lamp
lamp vessel
powder layer
vessel
powder
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
Application number
EP19860200141
Other languages
German (de)
English (en)
Other versions
EP0192290A1 (fr
Inventor
Christiaan Prozée
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0192290A1 publication Critical patent/EP0192290A1/fr
Application granted granted Critical
Publication of EP0192290B1 publication Critical patent/EP0192290B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/40—Devices for influencing the colour or wavelength of the light by light filters; by coloured coatings in or on the envelope

Definitions

  • the invention relates to an electric lamp having a glass lamp vessel which is sealed in a gastight manner and in which a light source is arranged, which is connected to current supply conductors, which are passed through the wall of the lamp vessel to the outside, this lamp vessel having on its inner surface an electrostatically applied powder layer which comprises a light-scattering powder.
  • a lamp is known from European Patent Application 0116994.
  • An electrostatically applied powder layer is distinguished from a powder layer formed from a suspension.
  • the former kind of layer has a very low packing density, which may even be fifty times lower than that of a layer formed from a suspension having the same powder composition.
  • the surface of the layer has a remarkable roughness as compared with the smooth surface of a layer formed from a suspension, when applied to a transparent non-frosted lamp vessel, an electrostatically applied layer shows clearly, when looking at the lamp vessel along a tangent line to this lamp vessel, that the wall of the lamp vessel has a certain thickness. This is not the case with a lamp vessel with a coating obtained from a suspension.
  • the method of coating a lamp vessel electrostatically affords the advantage that no organic solvents and binders are introduced into the lamp vessel, which have to be removed therefrom.
  • an electrostatically applied layer contains moisture, which is released gradually therefrom only during the operation of the lamp and adversely affects the quality of the lamp. The moisture may lead to the lamp vessel becoming leaky and in incandescent lamps may involve an accelerated transport of tungsten from the filament to the wall of the lamp vessel.
  • electrostatically applied layers containing a cadmium pigment exhibit a discolouring at areas at which they are strongly heated during the manufacture of the lamp. In a lamp in which the lamp vessel is fused at one end to a tube (stem tube) which tapers and projects into the lamp vessel, this discolouring occurs near this areas of the fusion of lamp vessel to stem tube.
  • the invention has for its object to provide a lamp of high quality coated electrostatically with powder.
  • this object is achieved in a lamp of the kind described in the opening paragraph in that the powder layer contains as an addition magnesium oxide.
  • magnesium oxide in a powder layer containing cadmium pigment reduces the discolouring of the layer.
  • 3 to 7 parts by weight thereof to 100 parts by weight of the other constituents of the powder the discolouring has been effectively suppressed.
  • the use of about 5 parts by weight per 100 parts by weight of the other constituents is sufficient to prevent the discolouring entirely or substantially entirely.
  • the light source of the lamp may be a filament, but may alternatively be a high-pressure discharge arc.
  • the powder layer comprises besides magnesium oxide at least one light-seattering substance. However, moreover a pigment may be present which may contain cadmium.
  • the quantity of magnesium oxide required for a maximum effect on the life of an incandescent lamp depends upon the moisture content of the electrostatic powder layer. In general, 3 to 10 parts by weight of magnesium oxide per 100 parts by weight of the other constituents of the powder are sufficient.
  • the powder layer will generally contain about 5 parts by weight of magnesium oxide per 100 parts by weight of the other constituents.
  • the lamp vessel 1 of bright glass sealed in a vacuum-tight manner has at its inner surface an electrostatically applied powder layer 2.
  • a filament 3 is arranged in the lamp vessel 1 and is connected to current supply conductors 4 which are passed through the wall of the lamp vessel to the outside and are connected to a lamp cap 5.
  • the lamp vessel 1 is fused at the end at which the lamp cap 5 is provided to a tube 6 (stem tube) which tapers and extends in the lamp vessel.
  • the fusion of the tube 6 to the lamp vessel 1 may lead to a discolouring of the powder layer in the proximity of the fusion area.
  • composition of the powder layer in the lamp according to the invention are (quantities in parts by weight):
  • the first layer can be much thinner than the layer according to Examples 1 and 2 and nevertheless the same colour satiration of the emitted light can be obtained.
  • the powder mixtures were obtained by mixing powders of the constituents in dry state. This has the advantage that no liquids are used and consumed so that environmental pollution and energy consumption for drying the mixture are avoided.
  • the lamps were manufactured in a flow of nitrogen. A positive potential of 12 kV with respect to the powder mixture to be applied was given to the lamp vessel. The lamp vessel was fused to a stem tube provided with a gas filling or evacuated and then sealed. No or substantially no discolouring of the powder layer could be observed.
  • the Table indicates results of life tests carried out on 40 W, 230 V vacuum incandescent lamps of the kind shown in the drawing.
  • the Table also states whether a mixture of zirconium and aluminium as a water getter is present (+) or is not present (-) on a current supply wire in the lamp.
  • the lamps were operated in the bare state or in a hot fitting (a luminaire open only on the lower side) at 105% and 100%, respectively, of the nominal voltage (Vn).
  • the lamps 1 having a red electrostatically applied powder layer according to Example 1 have a considerably longer life than the lamps 3, whose powder layer does not contain magnesium oxide.
  • the presence of a mixture of zirconium and aluminium in lamps 2 does not exert an additional effect.
  • the lamps 4 provided with a white electrostatically applied powder layer according to Example 5 have a considerably longer life than the lamps 6 which do not contain MgO in the powder layer.
  • the mixture of zirconium and aluminium does not exert an additional effect either.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Glass Compositions (AREA)

Claims (3)

1. Lampe électrique comportant une ampoule de lampe en verre qui est fermée d'une façon étanche au vide et dans laquelle est disposée une source lumineuse qui est connectée à des entrées de courant s'étendant à travers la paroi de l'ampoule de lampe vers l'extérieur, la surface intérieure de ladite ampoule de lampe présentant une couche de poudre appliquée par voie électrostatique et contenant une poudre de dispersion lumineuse, caractérisée en ce que la couche de poudre contient de l'oxyde de magnésium comme additif.
2. Lampe électrique selon la revendication 1, caractérisée en ce que la source lumineuse est un corps à incandescence.
3. Lampe électrique selon la revendication 1 ou 2, caractérisée en ce que la couche de poudre contient un composé de cadmium comme pigment.
EP19860200141 1985-02-04 1986-02-03 Lampe électrique à ampoule colorée Expired EP0192290B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL8500295 1985-02-04
NL8500295 1985-02-04
NL8503477A NL8503477A (nl) 1985-02-04 1985-12-18 Elektrische lamp met een elektrostatisch bedekt lampvat.
NL8503477 1985-12-18

Publications (2)

Publication Number Publication Date
EP0192290A1 EP0192290A1 (fr) 1986-08-27
EP0192290B1 true EP0192290B1 (fr) 1989-05-24

Family

ID=26646015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860200141 Expired EP0192290B1 (fr) 1985-02-04 1986-02-03 Lampe électrique à ampoule colorée

Country Status (6)

Country Link
EP (1) EP0192290B1 (fr)
JP (1) JPS61183865A (fr)
CN (1) CN1004954B (fr)
DE (1) DE3663606D1 (fr)
HU (1) HU192524B (fr)
NL (1) NL8503477A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6919679B2 (en) * 2001-12-14 2005-07-19 Koninklijke Philips Electronics N.V. Contaminant getter on UV reflective base coat in fluorescent lamps
RU2266263C2 (ru) 2002-10-04 2005-12-20 Текнопат Аг Способ перемещения и позиционирования листов стекла и устройство для его осуществления

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633127A (en) * 1983-02-10 1986-12-30 U.S. Philips Corp. Electric lamp having a strongly colored lamp envelope
CA1214195A (fr) * 1983-03-14 1986-11-18 Christiaan Prozee Lampe electrique comportant un revetement colore

Also Published As

Publication number Publication date
JPS61183865A (ja) 1986-08-16
CN86100621A (zh) 1986-07-30
EP0192290A1 (fr) 1986-08-27
NL8503477A (nl) 1986-09-01
CN1004954B (zh) 1989-08-02
HUT39534A (en) 1986-09-29
DE3663606D1 (en) 1989-06-29
HU192524B (en) 1987-06-29

Similar Documents

Publication Publication Date Title
US4441046A (en) Incandescent lamps with neodymium oxide vitreous coatings
JPH04245162A (ja) 低圧水銀蒸気放電灯
CA1222017A (fr) Ampoule electrique a enveloppe de verre teinte
US4099080A (en) Incandescent lamp with improved coating and method
EP0192290B1 (fr) Lampe électrique à ampoule colorée
US4636686A (en) Low-pressure mercury vapor discharge lamp provided with an amalgam forming alloy
GB1559589A (en) Discharge lamp envelopes
US3379917A (en) Fluorescent lamp with a reflective coating containing tio2 and sb or its oxide
US3879625A (en) Zirconia reflector coating on quartz lamp envelope
EP0249743A2 (fr) Lampes à décharge à enveloppes à arc en céramique revêtue et leur fabrication
US4342937A (en) Metal halogen vapor lamp provided with a heat reflecting layer
US2988458A (en) Process for electrostatic coating of incandescent lamp envelopes
US4012655A (en) Refractory metal oxide reflector coating on lamp envelope
US6304029B1 (en) Low pressure mercury discharge lamp having a mercury holder with reduced lead oxide
JPS62283543A (ja) 金属蒸気放電灯
EP0366187A1 (fr) Lampe à dicharge à haute pression
US5969476A (en) Enviromentally safe yellow bug light
US3067351A (en) Aperture fluorescent lamp
EP0212683B1 (fr) Lampe électrique
GB388560A (en) Improvements in or relating to light generating vacuum tubes
US2970928A (en) Light-diffusing glass articles and process of preparing same
EP0118962A1 (fr) Lampe électrique à ampoule colorée
JPS60165035A (ja) 複写用螢光ランプとその製造方法
AU775446B2 (en) A mercury-free luminescent/flourescent lamp with cold hollow cathodes for colored decorative lighting or illuminated signs
JPS6258562A (ja) セラミツク放電灯

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): BE DE FR GB IT NL

17P Request for examination filed

Effective date: 19870226

17Q First examination report despatched

Effective date: 19880531

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT NL

REF Corresponds to:

Ref document number: 3663606

Country of ref document: DE

Date of ref document: 19890629

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19900228

Year of fee payment: 5

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
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910201

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910219

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19910222

Year of fee payment: 6

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910424

Year of fee payment: 6

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

Ref country code: NL

Effective date: 19910901

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920203

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

Ref country code: BE

Effective date: 19920228

BERE Be: lapsed

Owner name: PHILIPS' GLOEILAMPENFABRIEKEN N.V.

Effective date: 19920228

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19921030

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

Ref country code: DE

Effective date: 19921103

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: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050203