EP0184217A2 - Tube à décharge à arc à basse pression à tension élevée - Google Patents

Tube à décharge à arc à basse pression à tension élevée Download PDF

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Publication number
EP0184217A2
EP0184217A2 EP85115532A EP85115532A EP0184217A2 EP 0184217 A2 EP0184217 A2 EP 0184217A2 EP 85115532 A EP85115532 A EP 85115532A EP 85115532 A EP85115532 A EP 85115532A EP 0184217 A2 EP0184217 A2 EP 0184217A2
Authority
EP
European Patent Office
Prior art keywords
discharge tube
low pressure
arc discharge
pressure arc
envelope
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.)
Granted
Application number
EP85115532A
Other languages
German (de)
English (en)
Other versions
EP0184217B1 (fr
EP0184217A3 (en
Inventor
Radomir Lagushenko
Jakob Maya
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.)
Osram Sylvania Inc
Original Assignee
GTE Products Corp
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 Products Corp filed Critical GTE Products Corp
Publication of EP0184217A2 publication Critical patent/EP0184217A2/fr
Publication of EP0184217A3 publication Critical patent/EP0184217A3/en
Application granted granted Critical
Publication of EP0184217B1 publication Critical patent/EP0184217B1/fr
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/04Electrodes; Screens; Shields
    • H01J61/10Shields, screens, or guides for influencing the discharge
    • H01J61/103Shields, screens or guides arranged to extend the discharge path

Definitions

  • This invention relates to low pressure arc discharge tubes and more particularly to such tubes having an increased voltage drop thereacross.
  • ballastless discharge lamps it is desirable to raise the voltage across the lamp to equal the line voltage (110 volts in the U.S.: 220 volts in Europe) in order to minimize other circuit losses.
  • metal halide discharge lamps In low power, i.e. 40W, metal halide discharge lamps it is desirable to operate at about 50 volts across the lamps to maintain stability (approx. 50-60 volts across the ballast). This higher voltage can be obtained by raising the mercury pressure. However, this increases the probability of explosions. Therefore, it is desirable to raise the voltage without increasing the pressure.
  • the voltage across an arc discharge tube can be increased by varying the operating parameters of the discharge tube, such as the pressure; the current; the cathode fall: etc. However, altering these parameters effects the performance or some other aspect of the discharge tube.
  • a low pressure arc discharge tube having an envelope of elongate, substantially cylindrical shape and having an electrode located at each end of the envelope.
  • the envelope encloses an inert starting gas and a quantity of mercury. Included within the envelope are structural means for raising the voltage across the arc tube.
  • FIG. 1 shows an arc discharge tube 10 according to a preferred embodiment of the invention.
  • the arc discharge tube 10 includes an envelope 12 of substantially cylindrical shape which is generally made of light-transmitting soda-lime, lead, quartz or other suitable material.
  • An electrode 14 is located within each of the two axially opposed end portions 12a of the envelope.
  • the envelope 12 encloses an ionizable medium including a quantity of mercury and an inert starting gas, e.g. neon at a low pressure in the range of about 0.5 to 4 torr.
  • Structural means 18 of quartz, glass, ceramic or other suitable electrically insulating material for raising the voltage across the arc discharge tube 10 are incorporated within envelope 12.
  • structural means 18 comprise a plurality of axially spaced apart partitions 20 each having at least one aperture 22 therein. Each of the partitions extends across the envelope 12 substantially normal to the longitudinal axis 23 and has a thickness T.
  • T has a dimension less than the electron energy relaxation distance d of the discharge tube.
  • the electron energy relaxation distance is defined by the equation:
  • Each of the partitions 20 contains at least one aperture 22 which constricts the arc within the tube and causes an increase in the voltage across the arc discharge tube.
  • Aperture 22 having a diameter C can be located at the center of the partition 20 or eccentrically located in the partition as in FIGS. 1-3. Locating the aperture 22 remote from the center of the partition, and having the apertures 22 of adjacent partitions 20 positioned in non-alignment provides the added advantage of increasing the effective arc length of the tube. The maximum effective arc length is achieved if the apertures 22 are also located alternatingly about the longitudinal axis of the arc tube and if the apertures intersect a common plane passing through the longitudinal axis.
  • the partitions 20 may be sealed hermetically to the interior surface of envelope 12. However, an hermetic seal is unnecessary if the total area between the perimeter of each partition and the interior surface of the envelope is less than the area of aperture 22.
  • the forming of the end portions 12a and the sealing of the electrode 14 leadwires can be performed after the partitions 20 are installed.
  • each partition 20 is inversely proportional to the size of the aperture 22.
  • An increase in voltage can be achieved when the ratio of the internal diameter B of the envelope 12 to the aperture 22 diameter C is as small as approximately 1.1:1.
  • the aperture 22 diameter C should be made small enough to achieve a ratio B:C of approximately 50:1.
  • Voltage increases of from about 0.5 volts to about 20 volts per partition can be achieved depending on the ratio B:C.
  • FIGS. 1-6 The invention will now be described more fully with reference to examples and to the drawings in FIGS. 1-6.
  • Each arc discharge tube was constructed from quartz all having an envelope 12 wall thickness of about 1 mm, a length X equal to about 90 mm and an outside diameter of about 25 mm. Each arc tube contained a fill gas of 100 percent neon at a pressure of about 2.0 torr.
  • the arc tube 10 of FIG. 1 was made with six apertured quartz partitions 20, each having a thickness T equal to about 1 mm.
  • the partitions 20 were equally spaced apart from each other by about 10 mm.
  • the distance from either electrode 14 to an adjacent partition 20 was also about 10 mm.
  • Each of the six partitions 20 had an aperture 22 diameter C of about 0.5 mm. This results in a ratio B:C of 50:1.
  • the apertures 22 were located alternating about the longitudinal axis of the arc tube 10. The distance D from the longitudinal asix to the midpoint of each aperture was about 2 mm.
  • the apertures also intersect a common plane passing through the longitudinal axis of the arc tube (e.g., the plane of the drawing of FIG. 1).
  • FTG. 4 shows a reference or control tube 10' constructed without the apertured partitions.
  • FIG. 5 shows an arc tube 10" according to another embodiment of the invention containing two apertured quartz partitions 24, each having a thickness T equal to about 1 mm.
  • the two partitions were spaced apart from each other by about 25 mm.
  • the distance from either electrode 14 to an adjacent" partition 24 was about 20 mm.
  • the two partitions 24 had an aperture 26 having a diameter C of about 2 mm and located coaxially at about the midpoint of the partition.
  • FIG. 6 shows an arc tube 101" made in accordance with yet another invention and having a single quartz partition 24 located at approximately the center of the tube.
  • the partition 24 had a thickness T equal of about 1 mm.
  • This partition 24 which was similar to those used in FIG. 5, had an aperture 26 with a diameter C of about 2 mm and was located coaxially at about the midpoint of the partition 24.
  • the partition 24 of FIG. 6 was positioned at about the center of the arc tube envelope 12.
  • Table 1 shows the electrical parameters obtained from the four above mentioned arc tubes.
  • Arc tubes 10, 10" and 10" were made according to the invention while arc tube 10' denotes the reference control tube.
  • a comparison of arc tube 10 with the reference arc tube 10 shows that at. an arc current of 1.0 amp, the voltage across the arc tube has increased by about 92 percent. This is a voltage increase per partition of 6 volts.
  • a comparison of arc tubes 10" and 10"' shows an increase bf 11 volts per partition at. an arc current of 1.0 amp and an increase of 8 volts per partition at an arc current of 0.5 amp.
  • the present invention is not limited to use in a glow discharge of mercury-inert gas without a phosphor layer.
  • use of partitions according to the invention in a 14" T12 European fluorescent lamp could increase the voltage from 39 volts to 100 volts. This would cause the voltage across the ballast to drop from 180 volts to 120 volts and thereby reduce the ballast losses by 35%.
EP19850115532 1984-12-06 1985-12-06 Tube à décharge à arc à basse pression à tension élevée Expired EP0184217B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67895884A 1984-12-06 1984-12-06
US678958 1984-12-06

Publications (3)

Publication Number Publication Date
EP0184217A2 true EP0184217A2 (fr) 1986-06-11
EP0184217A3 EP0184217A3 (en) 1988-11-02
EP0184217B1 EP0184217B1 (fr) 1991-06-05

Family

ID=24725033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850115532 Expired EP0184217B1 (fr) 1984-12-06 1985-12-06 Tube à décharge à arc à basse pression à tension élevée

Country Status (4)

Country Link
EP (1) EP0184217B1 (fr)
JP (1) JPS61135041A (fr)
CA (1) CA1255738A (fr)
DE (1) DE3583120D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547813A1 (de) * 1995-12-20 1997-06-26 Heraeus Noblelight Gmbh Elektrodenlose Entladungslampe mit Blendenkörper
US5814951A (en) * 1995-12-20 1998-09-29 Heraeus Noblelight Gmbh Low-pressure discharge lamp containing a partition therein
WO2015165843A1 (fr) * 2014-04-29 2015-11-05 LAZAREV, Nikolai Source de lumière

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100912334B1 (ko) * 2001-09-28 2009-08-14 하마마츠 포토닉스 가부시키가이샤 가스 방전관

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912243C (de) * 1950-08-11 1954-05-28 Dr Franz Skaupy Leuchtstoffroehre
FR1162139A (fr) * 1954-12-14 1958-09-09 Thomson Houston Comp Francaise Enveloppes résistant à l'écrasement pour lampes tubulaires à décharge à basse pression ou à incandescence et lampes à décharge à rendement amélioré

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912243C (de) * 1950-08-11 1954-05-28 Dr Franz Skaupy Leuchtstoffroehre
FR1162139A (fr) * 1954-12-14 1958-09-09 Thomson Houston Comp Francaise Enveloppes résistant à l'écrasement pour lampes tubulaires à décharge à basse pression ou à incandescence et lampes à décharge à rendement amélioré

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547813A1 (de) * 1995-12-20 1997-06-26 Heraeus Noblelight Gmbh Elektrodenlose Entladungslampe mit Blendenkörper
US5801495A (en) * 1995-12-20 1998-09-01 Heraeus Noblelight Gmbh Low-pressure discharge lamp containing partitions therein
US5814951A (en) * 1995-12-20 1998-09-29 Heraeus Noblelight Gmbh Low-pressure discharge lamp containing a partition therein
EP0780882A3 (fr) * 1995-12-20 1999-02-24 Heraeus Noblelight GmbH Lampe à décharge sans électrodes avec un élément de diaphragme
WO2015165843A1 (fr) * 2014-04-29 2015-11-05 LAZAREV, Nikolai Source de lumière

Also Published As

Publication number Publication date
EP0184217B1 (fr) 1991-06-05
CA1255738A (fr) 1989-06-13
EP0184217A3 (en) 1988-11-02
JPS61135041A (ja) 1986-06-23
DE3583120D1 (de) 1991-07-11

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