WO2019234454A2 - Source de lumière plasma - Google Patents

Source de lumière plasma Download PDF

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Publication number
WO2019234454A2
WO2019234454A2 PCT/GB2019/051603 GB2019051603W WO2019234454A2 WO 2019234454 A2 WO2019234454 A2 WO 2019234454A2 GB 2019051603 W GB2019051603 W GB 2019051603W WO 2019234454 A2 WO2019234454 A2 WO 2019234454A2
Authority
WO
WIPO (PCT)
Prior art keywords
plasma
light source
crucible
lucent
plasma light
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/GB2019/051603
Other languages
English (en)
Other versions
WO2019234454A3 (fr
Inventor
Stuart Mucklejohn
Barry Preston
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.)
Ceravision Ltd
Original Assignee
Ceravision Ltd
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 Ceravision Ltd filed Critical Ceravision Ltd
Publication of WO2019234454A2 publication Critical patent/WO2019234454A2/fr
Publication of WO2019234454A3 publication Critical patent/WO2019234454A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/20—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent mercury vapour
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/044—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by a separate microwave unit

Definitions

  • the present invention relates to a plasma light source
  • Light source means an actual emitter of light, together with closely associated components for controlling spread of light
  • Luminaire means a complete light unit, including a light source.
  • the apparatus has a light transmitting bulb for confining a discharge therein, a fill sealed within the light transmitting bulb and including a rare gas and a metal halide emitting a continuous spectrum by molecular radiation, and a discharge excitation source for applying electrical energy to the fill and for starting and sustaining an arc discharge, and the metal halide includes one kind of halide selected from the group consisting of an indium halide, a gallium halide, and a thallium halide, or a mixture thereof, and in that the light transmitting bulb has no electrodes exposed in discharge space and further this construction utilizes the continuous spectrum of molecular radiation of the metal halide and thereby achieves high color rendering properties and high luminous efficacy simultaneously without using mercury as the fill”
  • This bulb produces a broad spectrum light as shown in the Matsushita Patent’s Fig. 1, reproduced in figure 1 of this specification.
  • the Matsushita Patent speaks of quantities of halides in mol/cm of wall to wall distance in the direction of the electric field. In the context of the Matsushita Patent, this is straightforward in that the bulb is circular. In our work, the cavities that we establish discharges in are circular cylindrical. For the avoidance of doubt, we measure the distance in the length of the circular cylindrical cavities.
  • Metal-halide lamps have high luminous efficacy of around 75-100 lumens per watt, which is about twice that of mercury vapor lights and 3 to 5 times that of incandescent lights and produce an intense white light.”
  • UV, visible light and infra-red (“IR”) radiation both as it reaches the outer atmosphere and as it reaches sea level.
  • IR infra-red
  • the object of the present invention is to provide a light source providing an enhanced of radiation at the blue end of the spectrum, including into ultraviolet (“UV”) wavelengths, with a view to a supplementing ambient light with
  • UV ultraviolet
  • a plasma light source comprising:
  • the metal halide together being provided in a concentration in use of less than 5.0 x 10-6 mol/cm of an inner wall-to-wall distance within the void with electrical energy being applied to excite the discharge with its electric field being in the direction of the wall-to-wall distance.
  • a lucent crucible of quartz is 4.9cm in diameter and 2.1cm in length.
  • a sealed plasma void is placed centrally on the central axis, with an antenna re-entrant at one end, but offset from the central axis of the crucible and close to the central void.”
  • the concentration of the halide is such that the vapour within the void is unsaturated in use. In other words there is no liquid pool. This results we believe in strong molecular radiation as well as atomic radiation.
  • the lucent envelope will be a lucent tube sealed at its ends to provide the sealed void, the length of the tube being in the direction of the wall-to- wall distance.
  • the lucent envelope will be provided within a central longitudinal bore in a separate lucent body. It can be fixedly provided within the bore in the separate lucent body.
  • the lucent crucible can be a body of lucent material having a sealed, central longitudinal bore which provides the sealed void, the length of the bore being in the direction of the wall-to-wall distance.
  • the crucible can be as described in our above Application No. WO
  • the crucible or the lucent body will be enclosed by:
  • the arrangement being such that light from a plasma in the void can pass through the plasma crucible and radiate from it via the cage.
  • the Faraday cage can be as described in our above Application No. WO 2010/133822.
  • noble gases are suitable for use as the inert gas: neon (Ne), argon (Ar), krypton (Kr), xenon (Xe).
  • Hg in the fill as a buffer.
  • metal halides can be chosen from fluorides, chlorides, bromides and iodides.
  • fluorides can only be used in plasma crucibles made of ceramic material.
  • the limits for the metal halide content of the plasma crucible are between 1.60 x 10 -8 and 4.99 x 10 -6 mol/cm of the inner wall-to-wall distance in the direction of the electric field of the electrical energy applied to excite the discharge.
  • Our preferred range is between 4.10 x 10 -8 and 1.85 x 10 -6 mol/cm.
  • Our preferred range for the inert gas content of the plasma crucible are between 1.00 x 10 -8 and 3.25 x 10 -6 mol/cm of the wall-to-wall distance in the direction of the electric field of the electrical energy applied to excite the discharge.
  • our preferred range for the buffer, i.e. Hg, content of the plasma crucible are between 1.25 x 10 -6 and 1.25 x 10 -4 mol/cm of the wall-to-wall distance in the direction of the electric field of the electrical energy applied to excite the discharge.
  • Figure 1 is a graph showing a broad spectrum of light produced by a bulb, such as used in US 5,864,210;
  • Figure 2 is a plot of solar radiation, showing UV, visible and infra-red radiation both as it reaches the outer atmosphere and as it reaches sea level;
  • Figure 3 is a perspective view of a lucent plasma crucible of the invention, such as used in WO 2010/133822;
  • Figure 4 is a cross-sectional view of a lucent envelope and body, such as used in WO 2014/045044, which can be used in a variant of the invention, the view is Figure 5 of WO 2014/045044;
  • Figure 5 is a similar cross-sectional view of another lucent envelope and body, such as used in WO 2015/189632, which can be used in another variant of the invention, the view is Figure 1 of WO 2015/189632.
  • Figure 6 is the output spectral power distribution between 300nm to 550nm for example F;
  • Figure 7 is the output spectral power distribution between 300nm to 1100nm for example F;
  • Figure 8 is the output spectral power distribution between 300nm to 550nm for example I;
  • Figure 9 is the output spectral power distribution between 300nm to 1100nm for example I;
  • Figure 10 is the output spectral power distribution between 300nm to 550nm for example J;
  • Figure 11 is the output spectral power distribution between 300nm to 1100nm for example J.
  • a light source 1 to be powered by microwave energy is shown. It is similar to that described in our WO 2010/133822, whose abstract is quoted above.
  • the source has a circularly cylindrical body 2 of quartz, forming a solid plasma envelope or crucible. Quartz is transparent to visible light and the outer surfaces of the quartz are polished.
  • the cmcible could be of translucent ceramic such as alumina. We use“lucent” to mean either transparent or translucent.
  • the cmcible has a length / and a diameterd. Aligned centrally is a void 3. It is short and of small diameter with respect to the dimensions of the cmcible itself.
  • the void is sealed by working of the material of the cmcible or an additional piece of quartz. Methods of sealing are described in our International application WO 2010/094938.
  • a Faraday cage 4 surrounds the curved side surface 5 and one end surface 6 of the cmcible. It can be of metallic mesh or reticular metallic sheet, such that the majority of light passing out of the crucible at these surfaces passes through the cage, whilst microwaves cannot.
  • a band 7 of the cage extends around an end of a carrier 8 to which the cage is fastened, thereby carrying the crucible.
  • An antenna 10 is arranged in a bore 11 extending within the plasma cmcible for transmitting plasma- inducing microwave energy to the fill.
  • the antenna has a connection 12 extending outside the plasma crucible for coupling to a source of microwave energy 14 - the source being shown diagrammatically. Details of such a source and means for feeding microwave energy into the connection are described in International patent application WO 2010/128301.
  • Figure 4 is a Figure 5 of WO 2014/045044, whose abstract is as follows - albeit with altered reference numerals:
  • a crucible 101 for a LUWPL is formed from a wave guide body 102 having a central bore 103 through it. Received within the central bore is a drawn quartz tube 104. having its ends sealed, one 141 having been worked flat to be coplanar with one face 121 of body. The other end 142 has a vestigial tip 143. This is secured to the body at the orifice 122 of the bore in the other face 123 of the body. The securement is by means of ceramic adhesive compound 105.
  • FIG. 5 is a Figure 1 of WO 2015/189632, whose abstract is as follows— albeit with altered reference numerals:
  • a light source 201 to be powered by microwave energy having a dielectric body 203 or fabrication of material lucent for exit of light therefrom, a receptacle 222 within the dielectric body or fabrication, and a lucent microwave-enclosing Faraday cage 209 surrounding the dielectric body or fabrication.
  • the dielectric body or fabrication within the Faraday cage forms at least part of a microwave resonant cavity.
  • a sealed plasma enclosure 221 of lucent material within the receptacle 222 has a means - not visible - for locating the plasma enclosure within the receptacle with respect to the dielectric body or fabrication.
  • the“enclosure” and the“receptacle” of WO 2014/045044 are the present envelope and bore in the body.
  • the wall-to-wall distance in the direction of the applied electric field is the internal distance in the length / in Figure 3 and the equivalent directions and distance in the lucent bodies and envelopes of WO
  • the envelope can be provided with means location means such as in that application, i.e. fused on lugs locating in recesses in the body from the bore.
  • the bore can be and the envelope can be plain with other location means provided.
  • quartz which has a dielectric constant of 3.78, as the material of the lucent crucible and we operate at a frequency of 2,450 MHz.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

Une source de lumière comporte une pièce cylindrique circulaire (2) de quartz formant une enveloppe ou un creuset de plasma solide. Le quartz est transparent à la lumière visible et les surfaces externes du quartz sont polies. Le creuset a une longueur l et un diamètre d. Un vide (3) est aligné de façon centrale. Il est court et de petit diamètre par rapport aux dimensions du creuset lui-même. Le vide est rendu étanche. Un remplissage insaturé de matériau excitable par micro-ondes (9) composé d'un halogénure de métal avec un tampon de mercure dans un gaz noble est contenu pour former un plasma émettant de la lumière à l'intérieur de celui-ci. Une antenne (10) est disposée dans un trou (11) s'étendant à l'intérieur du creuset de plasma pour transmettre au remplissage de l'énergie micro-ondes induisant un plasma. L'antenne comporte une connexion (12) s'étendant à l'extérieur du creuset de plasma pour le couplage à une source d'énergie micro-ondes (14), la source étant représentée schématiquement. Des détails d'une telle source et de moyens d'alimentation en énergie micro-ondes dans la connexion sont décrits dans la demande de brevet internationale WO2010/128301.
PCT/GB2019/051603 2018-06-08 2019-06-07 Source de lumière plasma Ceased WO2019234454A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1809481.3A GB201809481D0 (en) 2018-06-08 2018-06-08 A plasma light source
GB1809481.3 2018-06-08

Publications (2)

Publication Number Publication Date
WO2019234454A2 true WO2019234454A2 (fr) 2019-12-12
WO2019234454A3 WO2019234454A3 (fr) 2020-01-23

Family

ID=62975760

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2019/051603 Ceased WO2019234454A2 (fr) 2018-06-08 2019-06-07 Source de lumière plasma

Country Status (2)

Country Link
GB (1) GB201809481D0 (fr)
WO (1) WO2019234454A2 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5864210A (en) 1995-08-24 1999-01-26 Matsushita Electric Industrial Co., Ltd. Electrodeless hid lamp and electrodeless hid lamp system using the same
WO2010094938A1 (fr) 2009-02-23 2010-08-26 Ceravision Limited Scellement d'un creuset à plasma
WO2010128301A2 (fr) 2009-05-08 2010-11-11 Ceravision Limited Source lumineuse
WO2010133822A1 (fr) 2009-05-20 2010-11-25 Ceravision Limited Creuset de plasma radiotransparent
WO2014045044A1 (fr) 2012-09-19 2014-03-27 Ceravision Limited Creuset pour une source lumineuse à plasma à guide d'ondes radio-transparent (luwpl)
WO2015189632A1 (fr) 2014-06-13 2015-12-17 Ceravision Limited Source de lumière

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8502509A (nl) * 1985-09-13 1987-04-01 Philips Nv Hogedrukkwikdampontladingslamp.
US5382873A (en) * 1991-12-04 1995-01-17 U.S. Philips Corporation High-pressure discharge lamp with incandescing metal droplets
EP0587238B1 (fr) * 1992-09-08 2000-07-19 Koninklijke Philips Electronics N.V. Lampe à décharge à haute pression
EP1728265B1 (fr) * 2004-03-08 2008-08-27 Koninklijke Philips Electronics N.V. Lampe a halogenure de metal
EP2115766B1 (fr) * 2006-12-01 2012-07-25 Koninklijke Philips Electronics N.V. Lampe à halogénure métallique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5864210A (en) 1995-08-24 1999-01-26 Matsushita Electric Industrial Co., Ltd. Electrodeless hid lamp and electrodeless hid lamp system using the same
WO2010094938A1 (fr) 2009-02-23 2010-08-26 Ceravision Limited Scellement d'un creuset à plasma
WO2010128301A2 (fr) 2009-05-08 2010-11-11 Ceravision Limited Source lumineuse
WO2010133822A1 (fr) 2009-05-20 2010-11-25 Ceravision Limited Creuset de plasma radiotransparent
WO2014045044A1 (fr) 2012-09-19 2014-03-27 Ceravision Limited Creuset pour une source lumineuse à plasma à guide d'ondes radio-transparent (luwpl)
WO2015189632A1 (fr) 2014-06-13 2015-12-17 Ceravision Limited Source de lumière

Also Published As

Publication number Publication date
WO2019234454A3 (fr) 2020-01-23
GB201809481D0 (en) 2018-07-25

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