EP0054356A1 - Source lumineuse à cathodoluminescence et installations d'éclairage comprenant de telles sources lumineuses - Google Patents

Source lumineuse à cathodoluminescence et installations d'éclairage comprenant de telles sources lumineuses Download PDF

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Publication number
EP0054356A1
EP0054356A1 EP81305389A EP81305389A EP0054356A1 EP 0054356 A1 EP0054356 A1 EP 0054356A1 EP 81305389 A EP81305389 A EP 81305389A EP 81305389 A EP81305389 A EP 81305389A EP 0054356 A1 EP0054356 A1 EP 0054356A1
Authority
EP
European Patent Office
Prior art keywords
anode
grid
neck
cathode
lamp
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.)
Ceased
Application number
EP81305389A
Other languages
German (de)
English (en)
Inventor
Ian James Herbert Sweet
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 Company PLC
Original Assignee
General Electric Company 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.)
Filing date
Publication date
Application filed by General Electric Company PLC filed Critical General Electric Company PLC
Publication of EP0054356A1 publication Critical patent/EP0054356A1/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J63/00—Cathode-ray or electron-stream lamps
    • H01J63/06—Lamps with luminescent screen excited by the ray or stream

Definitions

  • This invention relates to cathodoluminescent light sources in the form of lamps which are suitable for use for general lighting purposes, and to electric lighting arrangements including such lamps.
  • a cathodoluminescent lamp which includes an evacuated bulbous glass envelope with an integral glass neck portion terminated by a cap, an anode constituted by an electrically conductive coating on at least part of the interior surface of the bulb wall, such that at least part of the bulb wall is'light transmissive, a layer of phosphor on the whole of the interior of the bulb wall and overlying the said anode coating, which phosphor is excitable to luminescence by electron bombardment, a dome-shaped grid located within the bulb adjacent to the junction between the bulb and neck of the envelope and supported by a hollow metal cyclinder disposed coaxially within the envelope neck, an electron emissive cathode mounted within the assembly of the grid and its supporting cylinder, which cathode is so shaped, and/or so located within the said grid assembly, that the electrons emitted from the cathode in operation of the lamp are substantially uniformly distributed over the whole
  • the cathode is of effectively circular form and is located coaxially within the grid assembly so that the electron emissive part thereof lies in the region of the junction between the grid and its supporting cylinder.
  • the cathode consists of a linear wire coil filament incorporating electron emissive material and disposed orthogonally to the longitudinal axis of the assembly of the grid and its supporting cylinder, and is located within the said cylinder in a position nearer to the open end of the cylinder remote from the grid than to the end thereof on which the grid is supported.
  • the leads to the cathode and grid are sealed into the closure of the neck of the envelope and extend to contacts on the lamp cap, and the lead to the anode is located along the exterior of the neck, being sealed through the envelope wall for connection to the anode coating, and extending to a contact provided on the exterior of the neck.
  • a cathodoluminescent lamp includes an evacuated bulbous glass envelope with an integral glass neck closed by a pinched glass foot tube incorporating an exhaust tube extending parallel to the longitudinal axis of the foot tube, the neck closure terminating in a cap, an anode constituted by an electrically conductive coating on at least part of the interior surface of the bulb wall, such that atleast part cf the bulb.
  • a wall is light transmissive, a layer of phosphor on the whole of the interior of the bulb wall and overlying the said anode coating, which phosphor is excitable to luminescence by electron bombardment, a dome-shaped grid located within the bulb adjacent to the junction between the bulb and neck of the envelope and supported by a hollow metal cylinder disposed coaxially within the envelope neck, an electron emissive cathode mounted within the assembly of the grid and its supporting cylinder, and electrically conducting leads, all located wholly within the envelope neck and neck closure, connecting said anode, grid and cathode to respective contacts carried by the said cap for connection to a circuit arrangement for operation of the lamp from a source of electric current supply, the leads to the grid and cathode being sealed through the glass of the pinched foot tube, and the lead to the anode passing through the said exhaust tube.
  • the location of the anode lead within the envelope neck, instead of on the outside thereof, is advantageous from the point of view of safety, in view of the high potential, of the order of 5 to 15 kilovolts, which is required to be applied to the anode for operation of the lamp.
  • the portion of the anode lead which passes through the exhaust tube is isolated from the portions of the cathode and grid leads which are sealed through the glass of the foot tube.
  • the portion of the anode lead extending within the envelope neck, from the anode coating on the bulb to the exhaust tube entry, should be located so that the distances between the anode lead and the other electrically conducting members within the neck, including the leads to the cathode and grid and the grid supporting cylinder, are maintained as large as possible.
  • the anode lead is preferably laid along, or close to, the interior surface of the envelope neck to a level approaching that of the exhaust tube opening, and then bent to enter the exhaust tube; at least the portion of the anode lead extending from the neck wall to the exhaust tube is preferably insulated by a surrounding glass sleeve.
  • the cathode in respect of its shape and location, may be of any of the forms described in the above-mentioned specification.
  • the anode coating preferably covers the whole of the interior surface of the bulb wall and may consist of a known type of light transmissive electrically conducting coating formed, for example, of tin oxide and/or indium oxide.
  • part of the bulb may be provided with an internal reflective metal coating which also serves as at least part of the anode, the remainder of the bulb either being free from any conductive coating or, preferably, having a light transmissive coating to provide continuity of the anode over the whole of the bulb wall.
  • the phosphor layer overlying the anode coating is preferably covered with a white particulate reflecting coating, which may consist of any highly reflective white substance which can be produced in the form of a smoke and deposited as very fine particles on the phosphor layer, for example titanium dioxide or magnesium oxide.
  • a white particulate reflecting coating which may consist of any highly reflective white substance which can be produced in the form of a smoke and deposited as very fine particles on the phosphor layer, for example titanium dioxide or magnesium oxide.
  • the invention further provides an electric lighting arrangement consisting of a lamp of the form described above, and a circuit arrangement for operating said lamp from a source of electric current supply, which circuit arrangement includes means for converting the supply voltage to unidirectional operating potentials of required magnitudes for application respectively to the anode, cathode and grid of the lamp.
  • Suitable operating potentials are 5 to 15 kilovolts applied to the anode, 40 to 250 volts applied to the grid, and a cathode potential lower than that applied to the grid.
  • the circuit arrangement may be contained within a housing which is detachably mounted on the lamp cap and is insertable into a lampholder, or may be incorporated in a lampholder, the housing or lampholder being provided with contacts arranged to co-operate with the contacts on the lamp cap.
  • the lamp shown in Figure 1 which is designed for general lighting service, comprises an evacuated envelope formed of lead glass, or any other suitable glass which will inhibit the transmission of X-rays generated by the electron bombardment of the envelope, and consisting of a bulb 1 and an integral neck 2 in which an electron gun assembly is mounted, and which is closed by a pinched glass foot tube 3 and surmounted by a brass cap 4.
  • the whole of the interior surface of the bulb 1 is coated with a film 5 of transparent conducting material, suitably tin oxide and/or indium oxide, which constitutes the anode, and this film is overlaid by a layer of electron-responsive phosphor 6.
  • the phosphor layer is coated with a thin layer ? of fine particulate titanium dioxide, deposited from a titanium oxide smoke produced, in known manner, by hydrolysis of titanium tetrachloride vapour by bubbling the vapour through water.
  • the electron gun assembly includes a cathode 8 in the form of a straight single coil of tungsten wire incorporating electron emissive material, for example one or more of the oxides of barium, strontium and calcium, a dome-shaped grid 9 formed of nickel wire mesh, supported on a titanium cylinder 10 in the lower part of which the cathode is located, and a titanium disc 11 of substantially the same diameter as the cylinder 10, which disc has a central aperture 12 and is located immediately below the open lower end of the cylinder 10.
  • a cathode 8 in the form of a straight single coil of tungsten wire incorporating electron emissive material, for example one or more of the oxides of barium, strontium and calcium
  • a dome-shaped grid 9 formed of nickel wire mesh, supported on a titanium cylinder 10 in the lower part of which the cathode is located
  • a titanium disc 11 of substantially the same diameter as the cylinder 10, which disc has a central aperture 12 and is located immediately below the open lower end of the cylinder 10.
  • the cathode coil is mounted on four support wires 13 sealed into a glass bead 14, the wires to which the ends of the coil are attached being extended through the aperture 12 in the disc 11 and joined to nickel wires 15 which are sealed through the foot tube 3 and which constitute supports for, and conducting leads to, the cathode.
  • the grid support cylinder 10 is carried by a nickel bracket 16 which is attached to a nickel wire 17 sealed through the foot tube and constituting the support and lead for the grid.
  • the disc 11 is supported by a nickel bracket 18 and nickel wire 19, also sealed into the foot tube; the wire 19 is connected to the negative lead to the cathode, as shown at 20.
  • a coating of carbon 21 is applied to the interior surface of the neck-bulb junction region, covering the edge region of the anode coating, and a nickel-iron alloy lead wire 22 is attached to the carbon coating and is laid close to the interior surface of the envelope neck to a point approaching the level of the opening of the exhaust tube 23 in th 'R foot tube, then bent to pass through the exhaust tube; the portion of the lead extending from the vicinity of the neck to the exhaust tube is covered by a glass sleeve 24.
  • a plan view showing the arrangement of the leads in the foot tube and exhaust tube, and including the portion of the anode lead passing from the neck wall to the exhaust tube, is shown in Figure 2.
  • the anode lead is suitably attached to the carbon coating 21 by a silver contact 25, formed by applying a drop of silver paint over the end of the lead in contact with the carbon, the paint being hardened by heating during subsequent processing of the lamp.
  • the anode lead wire may or may not be sealed through a glass bead before it is inserted into the exhaust tube, and the bead or wire is subsequently sealed into the exhaust tube by heating, after evacuation of the lamp. The glass seal is not seen in Figure 1, since it lies within the cap 4.
  • Barium/aluminium getter rings 26, of known form, are supported by wires 27 attached to the lead wires to the cathode and grid.
  • the lamp cap carries a pair of contacts 28, to which the cathode leads are connected, and a pin contact 29 to which the anode lead is connected, these contacts being insulated from each other and from the brass cap in the usual manner.
  • the grid lead 1? is connected to the brass cap itself, which thus constitutes the grid contact.
  • the cap is provided with locating pins 30, preferably three in number to ensure correct orientation of the lamp in a lampholder or circuit housing for connection of the respective contacts to the operating circuit.
  • the function of the disc .11, connected to the negative lead to the cathode, is to repel any electrons, emitted by the cathode in operation, which escape through the lower open end of the cylinder 10 and which would, in the absence of the disc, be attracted to the interior surface of the neck, which is positively charged in operation, thus heating the neck and possibly causing it to crack.
  • the lamp of the example is inserted into a lampholder, or a housing insertable into a lampholder, 'in which lampholder or housing a circuit arrangement for operating the lamp from an electric current supply is mounted, the lampholder or housing carrying internal contacts arranged to co-operate with the contacts 28 and 29 and the cap 4, for connection of the cathode, anode and grid respectively to the operating circuit.
  • the circuit arrangement employed may be of the form described in the specification of Application No. 81300387.8 with reference to Figure 4 of the drawings accompanying that specification.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP81305389A 1980-12-17 1981-11-13 Source lumineuse à cathodoluminescence et installations d'éclairage comprenant de telles sources lumineuses Ceased EP0054356A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8040346 1980-12-17
GB8040346 1980-12-17

Publications (1)

Publication Number Publication Date
EP0054356A1 true EP0054356A1 (fr) 1982-06-23

Family

ID=10518026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305389A Ceased EP0054356A1 (fr) 1980-12-17 1981-11-13 Source lumineuse à cathodoluminescence et installations d'éclairage comprenant de telles sources lumineuses

Country Status (5)

Country Link
EP (1) EP0054356A1 (fr)
JP (1) JPS57124844A (fr)
AU (1) AU539996B2 (fr)
GB (1) GB2089561B (fr)
ZA (1) ZA818144B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538950A1 (fr) * 1982-12-29 1984-07-06 Philips Nv Lampe a decharge dans le gaz
EP0102139A3 (fr) * 1982-08-19 1984-11-07 Osram- Gec Limited Sources cathodolumineuses et installations électriques comportant de telles sources

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69027930T2 (de) * 1990-05-10 1997-02-27 Imaging & Sensing Tech Aus einer Kathodenstrahlröhre bestehende Lampe für Leuchtanzeigen und Verfahren zum Erzielen einer gleichmässig beleuchteten Fläche
JPH0644477B2 (ja) * 1990-11-30 1994-06-08 伊勢電子工業株式会社 発光型光源用蛍光管
SE510413C2 (sv) * 1997-06-13 1999-05-25 Lightlab Ab En fältemissionskatod och en ljuskälla innefattande en fältemissionskatod
SE510412C2 (sv) * 1997-06-13 1999-05-25 Lightlab Ab En ljuskälla innefattande en fältemissionskatod och en fältemissionskatod för användning i en ljuskälla

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749448A (en) * 1952-04-22 1956-05-23 Sebel S A Electronic fluorescent illuminating lamp
US2907909A (en) * 1957-07-05 1959-10-06 Du Mont Allen B Lab Inc Light source
EP0035828A2 (fr) * 1980-02-27 1981-09-16 THE GENERAL ELECTRIC COMPANY, p.l.c. Lampe d'éclairage électronique à fluorescence et circuit associé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749448A (en) * 1952-04-22 1956-05-23 Sebel S A Electronic fluorescent illuminating lamp
US2907909A (en) * 1957-07-05 1959-10-06 Du Mont Allen B Lab Inc Light source
EP0035828A2 (fr) * 1980-02-27 1981-09-16 THE GENERAL ELECTRIC COMPANY, p.l.c. Lampe d'éclairage électronique à fluorescence et circuit associé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102139A3 (fr) * 1982-08-19 1984-11-07 Osram- Gec Limited Sources cathodolumineuses et installations électriques comportant de telles sources
FR2538950A1 (fr) * 1982-12-29 1984-07-06 Philips Nv Lampe a decharge dans le gaz

Also Published As

Publication number Publication date
GB2089561B (en) 1984-08-30
ZA818144B (en) 1982-10-27
AU7778981A (en) 1982-06-24
AU539996B2 (en) 1984-10-25
GB2089561A (en) 1982-06-23
JPS57124844A (en) 1982-08-03

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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

Designated state(s): BE DE FR IT NL

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THE GENERAL ELECTRIC COMPANY, P.L.C.

17P Request for examination filed

Effective date: 19821210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19850509

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SWEET, IAN JAMES HERBERT