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WO2006006844A2 - Lampe a decharge gazeuse comprenant une bobine stabilisatrice - Google Patents

Lampe a decharge gazeuse comprenant une bobine stabilisatrice Download PDF

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Publication number
WO2006006844A2
WO2006006844A2 PCT/NL2005/000460 NL2005000460W WO2006006844A2 WO 2006006844 A2 WO2006006844 A2 WO 2006006844A2 NL 2005000460 W NL2005000460 W NL 2005000460W WO 2006006844 A2 WO2006006844 A2 WO 2006006844A2
Authority
WO
WIPO (PCT)
Prior art keywords
gas discharge
discharge lamp
stabilising
coil
lamp according
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
PCT/NL2005/000460
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English (en)
Other versions
WO2006006844A3 (fr
Inventor
Paul Henri Frank De Haan
Peter Hans Wassink
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.)
Crossworks Contra Consulting Bv
Original Assignee
Crossworks Contra Consulting Bv
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 Crossworks Contra Consulting Bv filed Critical Crossworks Contra Consulting Bv
Publication of WO2006006844A2 publication Critical patent/WO2006006844A2/fr
Publication of WO2006006844A3 publication Critical patent/WO2006006844A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details

Definitions

  • the present invention relates to a gas discharge lamp comprising a gas discharge body in which electrodes are disposed for generating a gas discharge in said gas discharge body, and magnetic means disposed near the gas discharge body for influencing the gas discharge.
  • Such a gas discharge lamp is known from US-4, 982, 140.
  • the gas discharge lamp that is known therefrom comprises a gas discharge body in which a gas or plasma discharge is initiated - whether or not by means of electrodes - for the high-intensity gas discharge lamp that is to be used as a light source.
  • Magnetic means in the form of coils are arranged in and around the gas discharge lamp.
  • movable coils are disposed on one side of the gas discharge, which coils are wound in opposite directions and which function to assist in initiating a the gas discharge.
  • an excitation coil fed by a radio-frequency power source, which functions to maintain the gas discharge in the gas discharge body in use.
  • a drawback of the known gas discharge lamp is the complex, internally movable construction and the high degree of colour change that the vertical gas discharge exhibits.
  • the gas discharge lamp according to the invention is characterized in that said magnetic means are arranged at least round the electrode (s) for influencing the interface of the gas discharge formed at the electrode (s) .
  • the present invention is based on the perception that the gas discharge characteristics that are important in order to obtain a properly functioning gas discharge lamp, such as the maximum light output, the stability, the colour composition and the possibility to control the generated light, are to an important extent determined by the behaviour of the plasma discharge at the so called interface or boundary plasma layer, i.e. around the electrodes .
  • the interface appears to be an impeding factor as regards a satisfactory development of a stable and, if desired, large and controllable plasma main flow in the interior of the lamp.
  • By concentrating the magnetic field generated by the magnetic means on the electrodes said impediment is counteracted, with the plasma in the interface being blown away magnetically from the electrode in question, thus enabling an increased particle main flux.
  • the efficiency of the gas discharge lamp according to the invention in terms of light output appears to increase considerably as a result of this.
  • One embodiment of the gas discharge lamp according to the invention is characterized in that the magnetic means are arranged for forming a controllable magnetic field in the interface for increasing or decreasing the plasma.
  • Another embodiment of the gas discharge lamp according to the invention is characterized in that the magnetic means are provided with one or more stabilising coils to be coupled to the gas discharge in the gas discharge body for stabilising the gas discharge in use.
  • the gas discharge lamp according to the invention has this advantage that said at least one stabilising coil is disposed and fed either inside or outside the gas discharge body, and that the magnetic field thus generated near the location of the gas discharge has a stabilising effect on the gas discharge.
  • the same at least one coil that functions as a stability-enhancing coil in the case of a stationary gas discharge functions as a starter coil prior thereto, in a multifunctional manner if desired, for the purpose of facilitating the cold or hot initiation of the gas discharge.
  • the construction of the gas discharge lamp has thus been simplified, whilst the functionality has been improved.
  • the multifunctional starting/stabilising coil reduces the occurrence of convection in that the magnetic field generated by the gas discharge forces the gas discharge towards the centre of the aforesaid coil of the gas discharge lamp.
  • the plasma discharge as a whole will have a grater intensity.
  • the plasma process proceeds more efficiently and more light is produced by the lamp. It has furthermore become apparent that the influence of a separation of the components in the gas discharge body, which results in a colour change, is more effectively counteracted. The extent of the colour change along the more centrally located and more locally occurring gas discharge decreases, therefore. Since the gas discharge is more concentrated, the light output increases.
  • Another embodiment of the gas discharge lamp according to the invention is characterized in that said at least one stabilising coil and said gas discharge body are connected in series.
  • gas discharge lamp by means of which it becomes possible to control the gas discharge, is characterized in that the gas discharge lamp comprises a power supply circuit connected to said at least one stabilising coil for providing a stabilising current.
  • Yet another embodiment of the gas discharge lamp according to the invention is characterized in that the number of windings per unit length of said at least one stabilising coil is variable. This makes it possible to optimise the local magnetic field strength.
  • FIG. 1 shows a first embodiment of a gas discharge lamp according to the invention, comprising a stabilising coil
  • Figure 2 shows a second embodiment of the interior of a gas discharge lamp according to the invention, comprising a stabilising coil portions having a different number of windings per length;
  • Figure 3 shows a third embodiment of the interior of a gas discharge lamp according to the invention, comprising two stabilising coils
  • Figure 4 shows a fourth embodiment of a gas discharge lamp according to the invention, comprising groups of stabilising coils
  • Figure 5 shows a fifth embodiment of the interior of a gas discharge lamp according to the invention, comprising stabilising coils disposed outside the gas discharge body.
  • FIG 1 schematically shows the construction of a gas discharge lamp 1 which, apart from the usual constructional components, comprises a gas discharge body 2 and magnetic means, in this case in the form of a stabilising coil 3, arranged around the gas discharge body 2.
  • the gas discharge body 2 and the magnetic means 3 are placed in a transparent casing 4, which is usually made of glass.
  • the body 2 comprises two electrodes 5-1 and 5-2 (see figure 3) , which are electrically fed.
  • the stabilising coil 3 extends practically the entire length of the gas discharge body 2, which, upon being electrically fed, generates a magnetic field surrounding at least one gas discharge G (see fig. 5) , which is initiated in the body 2 in a known manner.
  • the field strength i.e.
  • the number of ampere- windings per metre (the pitch of the windings) is such that in this embodiment the plasma arc or gas discharge is forced towards the centre of the coil 3 when stationary, concentrating on the central axis thereof, which leads to an increased conversion efficiency and an increased light output.
  • the coil 3 forms part of the magnetic means 3 that blow the plasma away from at least one of the electrodes 5-1, 5-2 at the plasma interface formed around said electrode (s) .
  • the magnetic field of the coil 3 stabilises the plasma that is formed therein, as a result of which the extent of colour mixture and the aforesaid colour change is reduced.
  • a separate supply voltage connected to the coil 3 might provide the desired starting field in that case, stimulating the formation of the gas arc, so that a stabilising current through the coil 3 might result in the stabilisation of the gas discharge after some time.
  • the body 2 and the coil 3 may be connected in series, in which case a separate supply source is not needed. Furthermore, automatic composition takes place in that case, i.e. as the gas discharge flow increases, also the stabilising current through the coil 3 will increase, as a result of which the field that is thus stabilised in stationary condition is compressed or pinched more strongly.
  • the magnetic compression of the plasma being formed in this manner causes the light yield of the lamp 1 to increase.
  • the stabilisation coil 3 that is present in the (schematically shown) interior of the lamp 1 of figure 2 is built up of several coil portions indicated 3-1, 3-2 and 3- 3, which are connected in series in this case.
  • the portions 3-1 and 3-3 which may be wound in the same direction, possibly with variable winding pitch, and their magnetic fields retain the pulsating plasma arc on the left and on the right, whilst the magnetic field of the central coil 3-2 compresses the plasma in the direction of the central axis of the coil 3.
  • the coil portions may have different diameters, if desired, and/or a different number of ampere-windings per metre.
  • Figure 3 schematically shows the interior of a gas discharge lamp 1 comprising two coils, e.g. wound in opposite directions, which are disposed on either side of and outside the plasma arc of the gas discharge body 2.
  • the left-hand coil 3-1 acts in the same direction as the discharge during the first phase of a period of the alternating supply voltage, whereas precisely the reverse takes place during the next period.
  • the plasma will also move/vibrate slightly when an alternating supply voltage is used, and this pulsating effect causes the components in their gas discharge body 2 to be mixed, as a result of which separation and the accompanying colour change of the gas discharge is prevented.
  • FIG. 4 shows an embodiment comprising two groups of coils Sl and S2, each comprising four stabilising coils in this case, which generate a magnetic field which is directed towards the central axis of the plasma body 2 for at least part of a period. Generally, at least two groups of at least two to maximally eight stabilising coils will be used.
  • One supply unit (not shown) may be provided for each coil or group of coils so as to effect the desired , possibly moving, magnetic field configuration.
  • Such circuits may be integrated in a lamp base or socket, if desired.
  • FIG. 5 shows another embodiment of the gas discharge lamp 1, in which two stabilising coils 3-1 and 3-
  • the magnetic field generated by the stabilising coil or coils is larger, e.g. more than ten times larger, than the local geomagnetic field, the latter will have less influence on the forming and maintaining of the gas discharge. Furthermore, the field of the stabilising coil 3 has a diminishing effect on the known bending of the gas discharge to a corkscrew shape, with the plasma being pulled straight, as it were. If a high Q-value of the coil
  • a resistor to be connected in parallel therewith can provide attenuation.
  • the lamp 1 might comprise a secondary electrode for improving the starting behaviour, or be of an electrodeless type.
  • switching coils e.g. switching on or switching over
  • the gas discharge lamp is started, whether or not by means of starter coils, and the stabilising coils 3 are switched on once a desired operating temperature has been reached, so as to retain the plasma in question in the manner that is desirable at that point .
  • the stabilising coil or coils 3, 3-1, 3-2, 3-3, Sl, S2 may comprise one or more layers of windings. Furthermore it is possible for several coils, e.g. having a mutually different winding pitches and/or wire diameters, to be wound over each other.
  • One or more of the aforesaid coils may be connected to a frequency and/or phase controlled circuit, so that a signal is delivered to the coils whose strength, frequency and phase are such that, given the coil configuration in question, an optimally stabilised and steady (to the human eye) discharge and light image is obtained.
  • said coils should not only be considered as magnetic means in the form of coils that stabilise the plasma inside the body 2 and at the electrodes, but that they can also be considered as magnetic means that may function, possibly simultaneously, as means for pushing against the plasma interface that impedes the particle flux away from the electrodes.
  • a spherical plasma discharge as shown in figure 5 is formed, whereas an hourglass-shaped discharge (not shown) is obtained when the plasma is pushed (or pulled) towards the electrodes.

Landscapes

  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne une lampe à décharge gazeuse comprenant un corps de décharge gazeuse et des moyens magnétiques au moins partiellement placés à proximité du corps de décharge gazeuse afin d'influencer la décharge gazeuse au niveau de l'interface formée à la surface d'une ou de plusieurs électrodes. Les moyens magnétiques comprennent au moins une bobine stabilisatrice permettant de stabiliser la décharge gazeuse pendant fonctionnement, à la fois dans le corps de décharge gazeuse et au niveau des électrodes de la lampe. La bobine fonctionnant en tant que bobine stabilisatrice au cours d'une décharge gazeuse stationnaire, peut en outre assurer des fonctions multiples et servir de bobine de démarrage avant la décharge afin de faciliter l'amorçage de cette dernière. La concentration accrue de la décharge gazeuse permet d'améliorer le rendement lumineux de la lampe à décharge gazeuse.
PCT/NL2005/000460 2004-07-09 2005-06-29 Lampe a decharge gazeuse comprenant une bobine stabilisatrice Ceased WO2006006844A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1026622 2004-07-09
NL1026622A NL1026622C2 (nl) 2004-07-09 2004-07-09 Gasontladingslamp met stabilisatiespoel.

Publications (2)

Publication Number Publication Date
WO2006006844A2 true WO2006006844A2 (fr) 2006-01-19
WO2006006844A3 WO2006006844A3 (fr) 2006-06-08

Family

ID=34971017

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2005/000460 Ceased WO2006006844A2 (fr) 2004-07-09 2005-06-29 Lampe a decharge gazeuse comprenant une bobine stabilisatrice

Country Status (2)

Country Link
NL (1) NL1026622C2 (fr)
WO (1) WO2006006844A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013117391A1 (fr) * 2012-02-06 2013-08-15 Osram Gmbh Lampe à décharge haute pression

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NL42748C (fr) *
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US1996731A (en) * 1932-04-18 1935-04-02 Stewart C Whitman Light source for recording sound on film
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FR1308518A (fr) * 1960-12-27 1962-11-03 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Lampe électrique à décharge, haute pression, avec stabilisation par champ magnétique
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013117391A1 (fr) * 2012-02-06 2013-08-15 Osram Gmbh Lampe à décharge haute pression

Also Published As

Publication number Publication date
NL1026622C2 (nl) 2006-01-10
WO2006006844A3 (fr) 2006-06-08

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