EP1104006A2 - Ampoule plate - Google Patents
Ampoule plate Download PDFInfo
- Publication number
- EP1104006A2 EP1104006A2 EP00204005A EP00204005A EP1104006A2 EP 1104006 A2 EP1104006 A2 EP 1104006A2 EP 00204005 A EP00204005 A EP 00204005A EP 00204005 A EP00204005 A EP 00204005A EP 1104006 A2 EP1104006 A2 EP 1104006A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- bulb
- envelope
- radiation source
- radiation
- bulb 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.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/305—Flat vessels or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/02—Incandescent bodies
- H01K1/14—Incandescent bodies characterised by the shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K7/00—Lamps for purposes other than general lighting
Definitions
- the present invention relates to a bulb intended to emit radiation through an emission surface of an envelope containing a source of radiation.
- the envelope has the shape of a cylinder of revolution, the radiation source being constituted by a filament or a cylinder of small diameter disposed on the axis of revolution of the envelope.
- a bulb is known from French patent No. 1,270,856.
- the radiation emitted by a bulb of this type is in the form of cylindrical heat waves whose axis is that of the envelope.
- the distribution of the heat received by said surface is inhomogeneous, the places of the receiving surface closer to the axis of the envelope being subjected to a more intense heat than the places of the receiving surface which are the most distant from said axis.
- the present invention aims to remedy these drawbacks by proposing a bulb capable of emitting homogeneous radiation towards a flat surface with a high radiation density.
- the emission surface is substantially planar and the radiation source defines a planar surface substantially parallel to the emission surface.
- the flatness of the emitting surface and of the radiation source allows the bulb according to the invention to generate radiation in the form of plane heat waves allowing homogeneous heating of a plane receiving surface, as long as it is arranged parallel to the emission surface. Furthermore, the power surface density of the radiation emitted by the bulb according to the invention, and therefore the energy efficiency of the heating operations carried out using said bulb, will be directly a function of the ratio between the surface defined by the radiation source. and the emission surface, and can be adjusted during the design of the radiation source.
- the radiation source consists of at least one filament of flattened shape.
- the source of radiation consists of a plurality of coplanar filaments.
- the source of radiation consists of at least one convoluted filament.
- the radiation source is consisting of a reactive gas intended to be excited by means of electrodes.
- the envelope has a reflecting surface arranged opposite the emission surface.
- the reflective surface increases the surface power density of the radiation emitted by the bulb, and therefore further increase the energy efficiency of heating operations carried out by means of said bulb.
- the present envelope arranged opposite from the emission surface, a surface curved towards the outside of the envelope.
- Such convexity of the surface disposed opposite the emission surface will facilitate positioning of the bulb in a cavity formed within a lamp intended to accommodate the bulb.
- part of the radiation emitted by the bulb will be concentrated towards the center of it, which will facilitate the construction of the radiation source in some embodiments.
- FIG. 1 schematically shows a bulb according to a particular embodiment of the invention.
- This bulb is intended to emit radiation through an emission surface ES of an envelope ENV containing a source of radiation LEM.
- the envelope will advantageously be made of quartz or a special transparent glass for infrared and / or visible. If the contour of the emission surface ES is, in this example, circular, it is clear that any other shape, oval, rectangular, square, polygonal, etc., can be chosen according to the application for which the bulb is intended.
- the emission surface ES is plane, and the radiation source LEM defines a plane surface parallel to the emission surface ES.
- the LEM radiation source consists of a filament of flattened shape.
- the outline of the surface defined by this flattened filament is rectangular in this example, so that it is more easily distinguishable from the other elements of the bulb. It is nevertheless understood that the power surface density of the radiation emitted by the bulb will be all the greater as the area defined by the radiation source LEM will be similar to the emission area ES. Thus, in the present case, where the contour of the emission surface ES is of circular shape, it will be more advantageous in practice to provide the contour of the flattened filament with a circular shape.
- FIG. 2 illustrates another embodiment of the LEM radiation source, which is, in this example, constituted by N coplanar filaments W1 ... WN. These filaments form a grid whose outline has been chosen rectangular in this example, so that it is more easily differentiated from the other elements of the bulb. However, we understand that, as previously explained, it will be more advantageous in practice to provide the outline of this grid of circular shape in order to obtain a power surface density of the radiation emitted by the optimal bulb in the case where the contour of the emitting surface is, as shown here, circular in shape.
- FIG. 3 illustrates another embodiment of the LEM radiation source, which is, in this example, constituted by two convoluted filaments Wl and W2.
- the W1 and W2 filament convolutions are not very complex here, so that said filaments are identifiable in the figure. It is nevertheless understood that, to obtain an optimal surface power density, it will be necessary to create convolutions such that a large proportion of the points constituting the ES emission surface is directly above a portion of one of the convoluted filaments. A departure from this principle may however, it must be obtained if the surface facing the ES emission surface is curved towards the outside of the envelope ENV and covered with a reflective layer, in which case a part of the reflected radiation will be concentrated towards the center of the ES emission surface. This will reduce the density of filament convolutions near the center of the ES emission surface, and therefore to facilitate the construction of the EM radiation source, without compromising the homogeneity of the radiation emitted by the bulb.
- FIG. 4 illustrates a preferred embodiment of the LEM radiation source, which is, in this example, constituted by a reactive gas, represented in gray form, intended to be excited by means of electrodes El + and El-.
- the gas used may for example be Xenon.
- This embodiment is particularly advantageous in that, the distribution of the gas being isotropic within the envelope ENV, the radiation emitted by the bulb is by nature homogeneous over the entire emission surface ES. Provision may be made to cover the surface located opposite the emission surface ES with a reflective layer to improve uniformity and increase the power density of the radiation emitted by the bulb.
- FIG. 5 is a sectional view of a bulb according to a variant of the invention.
- the envelope ENV has a BOT bottom, arranged opposite the surface of ES emission.
- the LEM radiation source for example a flattened filament or a plurality coplanar filaments, made of tungsten, or any other radiant material, is arranged on the bottom BOT.
- the thickness of this LEM radiation source has been intentionally exaggerated so that it is clearly visible in the figure.
- the LEM radiation source consists of a material intended to be heated to incandescent
- the ENV envelope will advantageously be filled with an inert gas before sealing.
- a REF layer of reflective material for example based on ceramic, has been deposited on the surface of the bottom BOT, outside the envelope ENV, in order to increase the power density of the radiation emitted by the bulb.
- Figure 6 is a sectional view of a bulb according to another variant of the invention.
- the bottom BOT is curved towards the outside of the bulb.
- Source LEM radiation is constituted in this example by a plurality of convoluted filaments, with hatched sections appearing in the section plane. Some of these sections do not have a circular outline because, as can be deduced from Figure 3, some portions of filaments may not be perpendicular to the cutting plane.
- the radiation source LEM rests on the BOT bottom via a plurality of P1 ... PN stilts which can also be made of tungsten, or any other radiant material.
- a REF layer of material reflective for example ceramic-based, has been deposited on the surface of the BOT bottom, outside the envelope ENV, in order to increase the power density of the emitted radiation by the bulb and concentrate this density towards the center of the bulb. This limits the surface density of the convolutions of the filaments near the center of the surface ES emission, without compromising the homogeneity of the radiation emitted through said surface.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
- Resistance Heating (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
Une telle inhomogénéité est néfaste, car un chauffage nominal des endroits de la surface réceptrice les plus éloignés de l'axe de l'enveloppe peut causer une surchauffe des endroits les plus proches dudit axe, et donc d'endommager l'objet à chauffer, et, inversement, un chauffage nominal des endroits de la surface réceptrice les plus proches de l'axe de l'enveloppe se traduira par un chauffage insuffisant des endroits les plus éloignés dudit axe.
Par ailleurs, la densité surfacique de puissance du rayonnement émis par les ampoules connues est relativement faible, ce qui se traduit par un rendement énergétique faible.
Par ailleurs, la densité surfacique de puissance du rayonnement émis par l'ampoule selon l'invention, et donc le rendement énergétique des opérations de chauffage réalisées au moyen de ladite ampoule, sera directement fonction du rapport entre la surface définie par la source de rayonnement et la surface d'émission, et pourra être ajusté lors de la conception de la source de rayonnement.
- la figure 1 est une vue en perspective d'une ampoule selon un mode de réalisation de l'invention,
- la figure 2 est une vue en perspective d'une ampoule selon un autre mode de réalisation de l'invention,
- la figure 3 est une vue en perspective d'une ampoule selon un autre mode de réalisation de l'invention,
- la figure 4 est une vue en perspective d'une ampoule selon un mode de réalisation préféré de l'invention,
- la figure 5 est une vue en coupe d'une ampoule selon une variante de l'invention, et
- la figure 6 est une vue en coupe d'une ampoule selon une autre variante de l'invention.
Si le contour de la surface d'émission ES est, dans cet exemple, de forme circulaire, il est clair que toute autre forme, ovale, rectangulaire, carrée, polygonale, etc....peut être choisie en fonction de l'application à laquelle l'ampoule est destinée.
La surface d'émission ES est plane, et la source de rayonnement LEM définit une surface plane parallèle à la surface d'émission ES. Dans l'exemple décrit ici, la source de rayonnement LEM est constituée par un filament de forme aplatie. Pour des raisons de compréhension de la figure, le contour de la surface définie par ce filament aplati est rectangulaire dans cet exemple, afin qu'il soit plus aisément différentiable des autres éléments de l'ampoule. On comprend néanmoins que la densité surfacique de puissance du rayonnement émis par l'ampoule sera d'autant plus importante que la surface définie par la source de rayonnement LEM sera similaire à la surface d'émission ES. Ainsi, dans le cas présent, où le contour de la surface d'émission ES est de forme circulaire, il sera plus avantageux en pratique de doter le contour du filament aplati d'une forme circulaire.
On pourra prévoir de recouvrir la surface située en vis-à-vis de la surface d'émission ES d'une couche réfléchissante pour améliorer l'homogénéité et accroítre la densité de puissance du rayonnement émis par l'ampoule.
Claims (7)
- Ampoule destinée à émettre un rayonnement au travers d'une surface d'émission d'une enveloppe contenant une source de rayonnement, la surface d'émission étant substantiellement plane, la source de rayonnement définissant une surface plane substantiellement parallèle à la surface d'émission.
- Ampoule selon la revendication 1 dans laquelle la source de rayonnement est constituée par au moins un filament de forme aplatie.
- Ampoule selon la revendication 1 dans laquelle la source de rayonnement est constituée par une pluralité de filaments coplanaires.
- Ampoule selon la revendication 1 dans laquelle la source de rayonnement est constituée par au moins un filament convoluté.
- Ampoule selon la revendication 1 dans laquelle la source de rayonnement est constituée par un gaz réactif destiné à être excité au moyen d'électrodes.
- Ampoule selon la revendication 1 dans laquelle l'enveloppe présente une surface réfléchissante disposée en vis-à-vis de la surface d'émission.
- Ampoule selon la revendication 1 dans laquelle l'enveloppe présente, disposée en vis-à-vis de la surface d'émission, une surface bombée vers l'extérieur de l'enveloppe.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9914743 | 1999-11-23 | ||
FR9914743 | 1999-11-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1104006A2 true EP1104006A2 (fr) | 2001-05-30 |
EP1104006A3 EP1104006A3 (fr) | 2001-10-04 |
Family
ID=9552453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00204005A Withdrawn EP1104006A3 (fr) | 1999-11-23 | 2000-11-14 | Ampoule plate |
Country Status (4)
Country | Link |
---|---|
US (1) | US6608442B1 (fr) |
EP (1) | EP1104006A3 (fr) |
JP (1) | JP2001210451A (fr) |
CN (1) | CN1297250A (fr) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3788721A (en) * | 1970-12-15 | 1974-01-29 | Thorn Electrical Ind Ltd | Electrically conductive components |
US4585971A (en) * | 1984-12-18 | 1986-04-29 | Clegg John E | Flat circular foil-filament lamp |
GB2248141A (en) * | 1990-09-18 | 1992-03-25 | Servomex | Infra-red source |
US5500574A (en) * | 1994-09-28 | 1996-03-19 | Matsushita Electric Works R&D Laboratory, Inc. | Inductively coupled substantially flat fluorescent light source |
DE4438870A1 (de) * | 1994-11-03 | 1996-05-09 | Heraeus Noblelight Gmbh | Infrarotstrahler mit langgestrecktem Widerstandskörper als Strahlenquelle |
FR2748810A1 (fr) * | 1996-09-30 | 1997-11-21 | Commissariat Energie Atomique | Source de rayonnement infrarouge miniaturisee |
WO1998043278A2 (fr) * | 1997-03-21 | 1998-10-01 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Spot plat |
WO1999045557A1 (fr) * | 1998-03-05 | 1999-09-10 | Corning Incorporated | Article en verre muni de canaux et procede le concernant |
US5977707A (en) * | 1997-06-13 | 1999-11-02 | Koenig; Erl A. | Lamp filament and lamp filament assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1270856A (fr) | 1960-09-21 | 1961-09-01 | Philips Nv | Radiateur électrique |
US6114809A (en) * | 1998-02-02 | 2000-09-05 | Winsor Corporation | Planar fluorescent lamp with starter and heater circuit |
US6127780A (en) * | 1998-02-02 | 2000-10-03 | Winsor Corporation | Wide illumination range photoluminescent lamp |
-
2000
- 2000-11-14 EP EP00204005A patent/EP1104006A3/fr not_active Withdrawn
- 2000-11-20 US US09/716,912 patent/US6608442B1/en not_active Expired - Fee Related
- 2000-11-20 CN CN00128354A patent/CN1297250A/zh active Pending
- 2000-11-20 JP JP2000352035A patent/JP2001210451A/ja active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3788721A (en) * | 1970-12-15 | 1974-01-29 | Thorn Electrical Ind Ltd | Electrically conductive components |
US4585971A (en) * | 1984-12-18 | 1986-04-29 | Clegg John E | Flat circular foil-filament lamp |
GB2248141A (en) * | 1990-09-18 | 1992-03-25 | Servomex | Infra-red source |
US5500574A (en) * | 1994-09-28 | 1996-03-19 | Matsushita Electric Works R&D Laboratory, Inc. | Inductively coupled substantially flat fluorescent light source |
DE4438870A1 (de) * | 1994-11-03 | 1996-05-09 | Heraeus Noblelight Gmbh | Infrarotstrahler mit langgestrecktem Widerstandskörper als Strahlenquelle |
FR2748810A1 (fr) * | 1996-09-30 | 1997-11-21 | Commissariat Energie Atomique | Source de rayonnement infrarouge miniaturisee |
WO1998043278A2 (fr) * | 1997-03-21 | 1998-10-01 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Spot plat |
US5977707A (en) * | 1997-06-13 | 1999-11-02 | Koenig; Erl A. | Lamp filament and lamp filament assembly |
WO1999045557A1 (fr) * | 1998-03-05 | 1999-09-10 | Corning Incorporated | Article en verre muni de canaux et procede le concernant |
Also Published As
Publication number | Publication date |
---|---|
CN1297250A (zh) | 2001-05-30 |
EP1104006A3 (fr) | 2001-10-04 |
US6608442B1 (en) | 2003-08-19 |
JP2001210451A (ja) | 2001-08-03 |
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