EP0084268A2 - Lampe fluorescente à type de faisceau à cathode simple pour usage à courant continu - Google Patents

Lampe fluorescente à type de faisceau à cathode simple pour usage à courant continu Download PDF

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Publication number
EP0084268A2
EP0084268A2 EP82307012A EP82307012A EP0084268A2 EP 0084268 A2 EP0084268 A2 EP 0084268A2 EP 82307012 A EP82307012 A EP 82307012A EP 82307012 A EP82307012 A EP 82307012A EP 0084268 A2 EP0084268 A2 EP 0084268A2
Authority
EP
European Patent Office
Prior art keywords
anode
cathode
fluorescent lamp
electrode
beam mode
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.)
Withdrawn
Application number
EP82307012A
Other languages
German (de)
English (en)
Other versions
EP0084268A3 (fr
Inventor
Bowman A. Budinger
Wojciech W. Byszewski
Joseph M. Proud
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.)
Verizon Laboratories Inc
Original Assignee
GTE Laboratories Inc
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 GTE Laboratories Inc filed Critical GTE Laboratories Inc
Publication of EP0084268A2 publication Critical patent/EP0084268A2/fr
Publication of EP0084268A3 publication Critical patent/EP0084268A3/fr
Withdrawn legal-status Critical Current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
    • 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

  • the present invention is an improvement to co-pending U .S. Patent application serial No. 219,564, filed on December 23, 1980, for a "Beam Mode Fluorescent Lamp", assigned to the same assignee.
  • the present invention is also realted to U.S. patent applications D23282; D23687; D-23849; D23665 and D24231, all assigned to the same assignee.
  • the present invention pertains to beam mode discharge fluorescent lamps and more particularly to an arrangement for configuring the electrodes within a beam mode discharge fluorescent lamp.
  • grid shaped anodes are taught by the above mentioned application. These anodes are relatively expensive to manufacture and were believed to be necessary to accelerate the primary electrons in the discharge space.
  • the subject beam mode fluorescent lamp includes a light transmitting envelope enclosing a fill material, which emits ultraviolet radiation upon excitation.
  • a phosphor coating on an inner surface of the envelope emits visible light upon absorption of ultraviolet radiation.
  • a thermionic cathode for emitting electrons is located within the envelope.
  • the cathode is connected to a single DC power source by two conductors, one conductor connected to each end of the cathode. These same conductors also serve to support he cathode at a stationary location within said envelope.
  • An L-shaped anode is an integral part of the cathode configuration.
  • the anode extends over and parallel to the cathode having a connection to the end of the cathode to which the positive potential of the DC power source is applied.
  • This anode accelerates electrons emitted by the cathode to form an electron beam.
  • the anode is constructed of a simple round wire segment.
  • the anode is spaced apart from the cathode by a distance which is comparable to or somewhat less than the electron range in the fill material.
  • the structure of the anode permits acceleration of the corresponding electron beam with minimum collection of primary electrons due to the anode.
  • the fluorescent lamp includes a corresponding drift region within the envelope through which the electron beam drifts after passing the anode. Electrons in the electron beam collide with atoms of the fill material in a drift region, thereby causing excitation of a portion of the fill material atoms and emission of ultraviolet radiation and causing ionization of another portion of the fill material atoms thereby yielding secondary electrons. These secondary electrons cause further emissions of ultraviolet radiation.
  • the fill material typically includes mercury and a noble gas, such as neon.
  • the potential drop between the first and second ends of the cathode provides a potential difference between the anode and all points along the cathode except, the end that connects it to the anode.
  • the anode will be positive with respect to all points along the cathode except the end to which it is connected. This condition will accelerate electrons from the cathode to and past the anode and into the drift region.
  • the amount of visible light produced by this electrode configuration is substantially the same as that produced with a large wire mesh anode.
  • the instant invention replaces the mesh anode filament structure with a single electrode with an integrated anode-cathode combination.
  • This anode accelerates electrons, while minimizing the amount of electrons collected due to the shape of the anode.
  • this electrode requires only a single power source and two connecting leads. The power source must convert the incoming AC voltage to DC voltage for use by the lamp.
  • a vacuum type lamp envelope 31 made of a light emitting substance, such as glass, encloses a discharge volume.
  • the discharge volume contains a fill material which emits ultraviolet radiation upon excitation.
  • a typical fill material includes mercury and a noble gas or mixtures of noble gases.
  • a suitable noble gas is neon.
  • the inner surface of the lamp envelope 31 has a phosphor coating 37 which emits visible light upon absorption of ultraviolet radiation.
  • an electrode 29 including a thermionic cathode 34 and integral anode 35.
  • the function of the cathode 34 is to emit electrons, while the function of the anode 35 is to accelerate the electrons emitted by cathode 34, while collecting only a minimal amount of primary electrons.
  • Anode 35 is at the same electrical potential as the end 33 of cathode 34.
  • Anode 35 is L-shaped and extends upwardly relative to cathode 34.
  • Supporting conductors 36 and 39 provide for electrical connection of the single external power supply 40 through the envelope 31 in a vacuum tight seal, as well as providing support for the electrode structure 29.
  • Conductor 36 connects the negative output and conductor 39 the positive output of power supply 40 to the electrode 29.
  • Cathode 34 is of a thermionic type, requiring 20 to 30 volts DC for operation.
  • the lamp further includes a base 38 which is of a conventional type suitable for inserting into an incandescent lamp socket.
  • a DC voltage is applied via conductors 36 and 39 to electrode 29, thereby providing for a readily available supply of electrons for discharge by cathode 34.
  • a discharge is formed and point 33 is positive with respect to point 32 of cathode 34.
  • Anode 35 will accelerate the electrons emitted from cathode 34, since anode 35 is positive with respect to all points along the cathode 34 with the exception of point 33.
  • Most electrons will then pass the anode and into the corresponding drift region 30 as shown. This result is due to the simple round wire segment anode construction vis-a-vis the mesh anode which collects many electrons.
  • cathode heating current and current for developing potential difference between anode 35 and cathode 34 of electrode 29 are derived from the same power supply 40. Only a single power supply and a pair of leads are required for these two functions.
  • Power supply 40 comprises a step-down transformer and a rectifier to produce the required DC voltage, approximately 20 volts.
  • the spacing of the anode 35 with respect to cathode 34 may be such that it is less than the electron range in the particular fill material to avoid possible current runaway conditions.
  • the simple round wire anode is effective to replace the larger mesh anode, while collecting less electrons than the mesh anode.

Landscapes

  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP82307012A 1982-01-04 1982-12-31 Lampe fluorescente à type de faisceau à cathode simple pour usage à courant continu Withdrawn EP0084268A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33704782A 1982-01-04 1982-01-04
US337047 1982-01-04

Publications (2)

Publication Number Publication Date
EP0084268A2 true EP0084268A2 (fr) 1983-07-27
EP0084268A3 EP0084268A3 (fr) 1984-05-02

Family

ID=23318887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82307012A Withdrawn EP0084268A3 (fr) 1982-01-04 1982-12-31 Lampe fluorescente à type de faisceau à cathode simple pour usage à courant continu

Country Status (3)

Country Link
EP (1) EP0084268A3 (fr)
JP (1) JPS58145056A (fr)
CA (1) CA1190587A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005062394A1 (de) * 2005-07-10 2007-01-11 Ip2H Ag Lichtquelle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0620285Y2 (ja) * 1986-12-05 1994-05-25 松下電工株式会社 光放射電子管
JP4417970B2 (ja) 2007-03-29 2010-02-17 株式会社東芝 回転電機および回転電機の回転子

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403184A (en) * 1942-12-26 1946-07-02 Gen Electric Electric discharge lamp
US2409771A (en) * 1943-07-08 1946-10-22 Sylvania Electric Prod Electrical discharge device
US2774918A (en) * 1951-10-06 1956-12-18 Gen Electric Electric discharge device
US3369143A (en) * 1967-02-28 1968-02-13 Westinghouse Electric Corp Instant-start fluorescent lamp having mixed fill gas and improved electrode structure
EP0054959A1 (fr) * 1980-12-23 1982-06-30 GTE Laboratories Incorporated Lampe fluorescente à rayons

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2403184A (en) * 1942-12-26 1946-07-02 Gen Electric Electric discharge lamp
US2409771A (en) * 1943-07-08 1946-10-22 Sylvania Electric Prod Electrical discharge device
US2774918A (en) * 1951-10-06 1956-12-18 Gen Electric Electric discharge device
US3369143A (en) * 1967-02-28 1968-02-13 Westinghouse Electric Corp Instant-start fluorescent lamp having mixed fill gas and improved electrode structure
EP0054959A1 (fr) * 1980-12-23 1982-06-30 GTE Laboratories Incorporated Lampe fluorescente à rayons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005062394A1 (de) * 2005-07-10 2007-01-11 Ip2H Ag Lichtquelle

Also Published As

Publication number Publication date
EP0084268A3 (fr) 1984-05-02
CA1190587A (fr) 1985-07-16
JPH0454342B2 (fr) 1992-08-31
JPS58145056A (ja) 1983-08-29

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19830121

AK Designated contracting states

Designated state(s): DE FR GB NL

PUAL Search report despatched

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Designated state(s): DE FR GB NL

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

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18D Application deemed to be withdrawn

Effective date: 19870303

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BUDINGER, BOWMAN A.

Inventor name: BYSZEWSKI, WOJCIECH W.

Inventor name: PROUD, JOSEPH M.