WO1997021239A1 - Procede de fabrication d'ecrans de differentes dimensions pour lampes fluorescentes, et ecrans ainsi obtenus - Google Patents

Procede de fabrication d'ecrans de differentes dimensions pour lampes fluorescentes, et ecrans ainsi obtenus Download PDF

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Publication number
WO1997021239A1
WO1997021239A1 PCT/IT1996/000243 IT9600243W WO9721239A1 WO 1997021239 A1 WO1997021239 A1 WO 1997021239A1 IT 9600243 W IT9600243 W IT 9600243W WO 9721239 A1 WO9721239 A1 WO 9721239A1
Authority
WO
WIPO (PCT)
Prior art keywords
strip
shield
shields
fluorescent lamps
support
Prior art date
Application number
PCT/IT1996/000243
Other languages
English (en)
Inventor
Saverio Massimo Palladino
Original Assignee
Saes Getters S.P.A.
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 Saes Getters S.P.A. filed Critical Saes Getters S.P.A.
Priority to AU11088/97A priority Critical patent/AU1108897A/en
Publication of WO1997021239A1 publication Critical patent/WO1997021239A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel

Definitions

  • PROCESS FOR MANUFACTURING SHIELDS OF DIFFERENT SIZE FOR FLUORESCENT LAMPS AND SHIELDS PRODUCED THROUGH SUCH A PROCESS
  • the present invention is directed to a process for manufacturing shields of different size for fluorescent lamps from metallic strip, as well as to the shields produced thereby.
  • Fluorescent lamps are used in indoor lighting and their spread is increasing also owing to the fluorescent lamps with a low power consumption which have been put on the market.
  • the fluorescent lamps are formed of glass tubes innerly lined with powders of fluorescent materials (called phosphors); these lamps also comprise two electrodes, generally defined as cathodes and are filled with a gaseous mixture consisting of a rare gas and mercury vapours.
  • cathodes When the lamp is turned on, an electric discharge is generated between cathodes with consequent excitation of the filling gas thus forming a cold plasma; the excited atoms of mercury being present in the plasma emit a UV radiation which is converted by phosphors in the visible light of the lamp.
  • each cathode has a shield which is generally made of a metallic material strip, bent and welded at the ends to form a cylindrical surface. These shields are placed about the cathodes, axially to the lamp and have the purpose of preventing from degradation the phosphors being nearer to the cathodes, due to a direct electronic radiation from the cathodes themselves.
  • a getter material i.e. a metal or a metallic alloy capable of irreversibly fixing the reactive gases within lamp by means of a chemical reaction.
  • gases have a harmful influence on the lamp functioning through different mechanisms: hydrogen requires an increase of the potential difference which is necessary between the two cathodes for maintaining the discharge; oxygen as such or contained in the water takes away mercury from its function to form mercury oxide; carbon monoxide and bi-oxide are decomposed on the cathode thus forming oxygen which has the harmful effect already mentioned, and carbon which deposits onto the phosphors in the form of a black layer thus reducing the lamp brightness.
  • getter material in the lamps is an alloy of percent composition in weight Zr 84%-AI 16%, manufactured and sold by the applicant with the tradename St 101.
  • Other getter materials which are useful to the purpose are e.g. the alloy having the composition Zr 70%-V 24,6%-Fe 5,4% and the alloy of composition Zr 77,6% Fe 23,4% (percentages by weight) manufactured and sold by the applicant under the tradenames St 707 and St 198, respectively.
  • fluorescent lamps require mercury, for their operation, in quantities varying between 3 and 10 mg according to the type of lamp.
  • Copper-tin alloys or copper-silicon alloys can be added to these intermetallic compounds with the function of promoting the mercury releasing. Also these materials can be rolled onto the strip by which the shield is produced, in order to obtain a device combining the functions of shield, getter and mercury dispenser, which also provides a very helpful solution for the manufacturing of lamps.
  • Object of the present invention is that of providing a solution to the requirement of producing in a simple way strips useful to form shields for fluorescent lamps having whichever size range.
  • Figure 1 shows a possible support strip from which lengths or pieces for producing shields can be obtained
  • Figure 2a shows the strip of figure 1 with marked the cuts to be made (lines l-l, I'-l', l"-l", ...) to obtain pieces like that of figure 2b (it will be noted that the piece of figure 2b and strip of figure 2a are not in the same scale);
  • Figure 2c shows a shield for fluorescent lamps as obtained from the piece of figure 2b;
  • Figure 3a shows the strip of figure 1 with marked the cuts to be made
  • Figure 3c shows a shield for fluorescent lamps as obtained from the piece of figure 3b.
  • the support strip can be made in various metals, but preferred is the use of nickel-plated steel showing good mechanical features and resistance to oxidation even at the high temperatures undergone by the shields during the lamps manufacturing.
  • Such a strip has generally a thickness of about 0,5 mm.
  • the strip width is instead determined by the circumference of the smallest shield which is intended to be produced therefrom. In particular this width is preferably equal to or less than the circumference of shield with a length of about 2-3 mm added, corresponding to the end portions of the strip or piece which are overlapped and welded to form the ring-shaped shield.
  • Tracks of the active materials are deposited on the support strip through various techniques. The preferred techniques is the cold rolling well known in the field of the "powders" technology.
  • the powders to be rolled have a particle size generally comprised between 40 and 120 ⁇ m
  • Figure 1 shows the drawing of a possible strip with powders of active materials.
  • the pieces of a stripe-shaped support strip on which the shields are obtained are made by cutting the strip with a pitch D and at an angle with respect to its central axis X-X, both varying according to the desired size of the shield.
  • the strip width is equal to or less than the smallest circumference of shield desired, there being added thereto almost two small lateral zones to be overlapped and welded.
  • C IJsin ⁇ wherein C and L are respectively the length of the obtained piece (equivalent to the circumference of the final shield, apart from the overlapping zone for welding) and the width of the strip.
  • A D sin ⁇ wherein A and D are respectively the height of the piece and distance (or pitch) between lines ll-ll and ll'-ll', being measured along the strip axis.
  • the length of the piece and its height can be varied at will, for the same strip, by controlling the angle and the pitch of the parallel cuts. For example, when cutting the strip at an angle of 30°, pieces are obtained which have lengths being about twice the strip width. In a continuous manufacturing process in which the strip is moved forward at a constant feeding speed, the pitch is instead simply adjusted by controlling the time interval between one cut and another.

Landscapes

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

Abstract

Procédé de fabrication d'écrans de différentes dimensions pour lampes fluorescentes, consistant à prévoir un support pour poudres sous la forme d'une bande métallique dont la largeur (L) est à peu près équivalente à la circonférence du plus petit écran à fabriquer; à déposer sur cette bande support au moins une piste en matériau dégazeur et au moins une autre piste en matériaux pulvérulents aptes à libérer du mercure; et à découper la bande support en pièces selon des lignes de découpage parallèles dont à la fois l'espacement (D) et l'angle (α) formé avec l'axe central (X-X) de la bande varient en fonction des dimensions voulues de l'écran.
PCT/IT1996/000243 1995-12-06 1996-12-05 Procede de fabrication d'ecrans de differentes dimensions pour lampes fluorescentes, et ecrans ainsi obtenus WO1997021239A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11088/97A AU1108897A (en) 1995-12-06 1996-12-05 Process for manufacturing shields of different size for fluorescent lamps and shields produced through such process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI95A002574 1995-12-06
IT95MI002574A IT1277050B1 (it) 1995-12-06 1995-12-06 Processo per la produzione di schermi di varie dimensioni per lampade fluorescenti e schermi cosi' prodotti

Publications (1)

Publication Number Publication Date
WO1997021239A1 true WO1997021239A1 (fr) 1997-06-12

Family

ID=11372677

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1996/000243 WO1997021239A1 (fr) 1995-12-06 1996-12-05 Procede de fabrication d'ecrans de differentes dimensions pour lampes fluorescentes, et ecrans ainsi obtenus

Country Status (3)

Country Link
AU (1) AU1108897A (fr)
IT (1) IT1277050B1 (fr)
WO (1) WO1997021239A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8253331B2 (en) 2010-04-28 2012-08-28 General Electric Company Mercury dosing method for fluorescent lamps

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3657589A (en) * 1969-10-20 1972-04-18 Getters Spa Mercury generation
JPH0676796A (ja) * 1992-08-31 1994-03-18 Hitachi Ltd 低圧放電灯

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3657589A (en) * 1969-10-20 1972-04-18 Getters Spa Mercury generation
JPH0676796A (ja) * 1992-08-31 1994-03-18 Hitachi Ltd 低圧放電灯

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DELLA PORTA P ET AL: "MERCURY DISPENSING AND GETTERING IN FLUORESCENT LAMPS", JAPANESE JOURNAL OF APPLIED PHYSICS, SUPPLEMENTS, vol. SUPPL. 2, no. PART 01, 25 March 1974 (1974-03-25), pages 45 - 48, XP002006410 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 324 (E - 1564) 20 June 1994 (1994-06-20) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8253331B2 (en) 2010-04-28 2012-08-28 General Electric Company Mercury dosing method for fluorescent lamps

Also Published As

Publication number Publication date
ITMI952574A0 (fr) 1995-12-06
AU1108897A (en) 1997-06-27
ITMI952574A1 (it) 1997-06-06
IT1277050B1 (it) 1997-11-04

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