EP0403369A1 - Beleuchtungseinrichtung für eine zylindrische Lichtquelle - Google Patents

Beleuchtungseinrichtung für eine zylindrische Lichtquelle Download PDF

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Publication number
EP0403369A1
EP0403369A1 EP90401623A EP90401623A EP0403369A1 EP 0403369 A1 EP0403369 A1 EP 0403369A1 EP 90401623 A EP90401623 A EP 90401623A EP 90401623 A EP90401623 A EP 90401623A EP 0403369 A1 EP0403369 A1 EP 0403369A1
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EP
European Patent Office
Prior art keywords
plane
light source
uniform illumination
reflector
symmetry
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
EP90401623A
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English (en)
French (fr)
Other versions
EP0403369B1 (de
Inventor
Ari Rabl
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.)
Association pour la Recherche et le Developpement des Methodes et Processus Industriels
Original Assignee
Association pour la Recherche et le Developpement des Methodes et Processus Industriels
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9382717&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0403369(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Association pour la Recherche et le Developpement des Methodes et Processus Industriels filed Critical Association pour la Recherche et le Developpement des Methodes et Processus Industriels
Priority to AT90401623T priority Critical patent/ATE102325T1/de
Publication of EP0403369A1 publication Critical patent/EP0403369A1/de
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Publication of EP0403369B1 publication Critical patent/EP0403369B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the present invention relates to a luminaire for a cylindrical light source such as for example a fluorescent tube.
  • Luminaires of the type known as using fluorescent tubes as a light source which have the advantage of providing uniform illumination of a work surface arranged at a given distance from the luminaire.
  • This type of luminaire has the disadvantage, however, of having no angular limitation of the lighting, especially in the longitudinal direction, that is to say in the direction of the axis of the tube.
  • CPC In order to improve the efficiency of energy sources, especially infrared, of the cylindrical type, reflectors have been used, designated by specialists in the field, by the abbreviated term "CPC", a term which we will use below. of this text.
  • These reflectors CPC have the particularity of being cylindrical in shape, the base surface of this cylinder being constituted by one or more curves of different equations, connected to each other and which may be, for example, parabolas, ellipses, or any other type of curves determined experimentally.
  • 2,623,633 reflectors for infrared furnaces from an infrared source cylindrical possible to obtain, on a remote target of a given value of the emitting source and , over a certain width, a relatively uniform heat distribution and having an optimum energy efficiency.
  • CPC reflectors make it possible to limit, transversely, that is to say perpendicular to the longitudinal axis of the cylindrical emitting source, the maximum angle of radiation.
  • CPC type infrared ovens do not make it possible to limit in the longitudinal direction, that is to say in the direction of the longitudinal axis of the cylindrical emitting source, the radiation angle, which limits their use in applications in which the energy efficiency of the oven must be favored.
  • reflectors of the CPC type which make it possible, from a planar infrared source, preferably rectangular, to obtain, on a target located at a given distance from the infrared source, a heating relatively uniform.
  • This type of reflector also makes it possible to limit, in the transverse direction, that is to say in the latter perpendicular to the longitudinal axis of the planar source, the angle of maximum incidence of the infrared rays leaving the reflector, and this for optimum energy efficiency, since it avoids stray rays and prisoners rays.
  • This type of reflector does not allow, any more than the previous one to limit in the longitudinal direction, that is to say in the direction of the longitudinal axis of the infrared source, the incidence of the rays leaving the diffuser, and by itself to control, in this sense, the stray radiation of the reflector.
  • the object of the present invention is to provide a luminaire making it possible to obtain, at a given distance therefrom, and on a determined surface, uniform illumination, having an optimum light output, and making it possible to control, both in the longitudinal direction, that is to say in the direction of the longitudinal axis of the cylindrical light source, that in the transverse direction, the maximum angle of incidence of the light rays leaving the luminaire.
  • the present invention thus relates to a luminaire comprising a cylindrical light source, a first reflective element symmetrical with respect to a plane P containing the longitudinal axis of the cylindrical light source, of the type capable of supplying, from said cylindrical light source a uniform flat illumination zone, perpendicular to the plane P, at a given distance d from its outlet opening and at least one second reflective element, symmetrical with respect to a plane Q, of the type capable of providing, from a planar light source situated in its base plane, perpendicular to this plane Q, a zone of uniform illumination at a given distance from its base plane characterized in that this second reflecting element is arranged downstream of the first, in such a way that its plane of symmetry Q is perpendicular both to that of the first element reflector and to the uniformly illuminated zone, and that its base plane is coincident with the exit plane of the first reflective element.
  • the second reflecting means arranged downstream of the first reflecting means, consist of a series of cylindrical reflecting elements with transverse axes, that is to say perpendicular to the plane of symmetry P of first reflecting means and of cross section consisting of three sides, a first side situated in the plane of the exit surface of the first reflecting means, the other two sides being symmetrical with respect to the perpendicular bisector of the first side, and of shapes such as they each constitute a half-reflector of two adjacent reflecting elements, the height of these elements and their spacing being such that they define the maximum angle ⁇ of the longitudinal rays reflected by the luminaire.
  • the luminaire according to the invention essentially consists of a reflector consisting of an upstream reflector element 1 of the CPC type, equipped with a cylindrical light source 3 and capable of creating a uniform lighting area 6 , plane and perpendicular to the plane P at a distance d from the outlet opening of its reflector element 1, and from a downstream reflector element 5 of CPC type, for plane light source, and capable of creating a uniform illumination zone 6 ′ at a distance d from the base of its reflective element, each of the half-reflectors of this type being used in the prior art to distribute the radiation emitted by cylindrical and plane infrared sources on a target.
  • the reflective element 1 is symmetrical with respect to a plane P perpendicular to the plane of FIG. 1, and containing the longitudinal axis of the cylindrical light source 3.
  • This reflective element 1 therefore consists of two half reflectors, namely a left half-reflector 1a, and a right half-reflector 1b, in the figure.
  • the cross section of each of the two half-reflectors 1a, 1b comprises two parts, namely a first curved part AB, in the form of an involute arc, and a second curved part BC.
  • the end A of the arc AB is located on the external cylindrical envelope la of the light source 3, in the plane of symmetry P of the reflector and on the rear side, that is to say opposite to the opening of the light source 3.
  • the other end B of the arc AB is located on the extreme radius R1 which is tangent to the "emitting" circle 3 and which passes through the left end 6a of the area of uniform illumination 6, that is to say that which is situated on the side of the plane of symmetry P opposite to that where the right half-reflector 1b is located.
  • the arc AB is an involute arc of the "emitting" circle forming the cross section of the cylinder constituting the light source 3, all the tangential rays, emitted by the light source 3, between the point of tangency of the extreme tangential radius R1 and point A, are reflected on themselves at all points of the arc AB.
  • the straight section of the right half-reflector 1b comprises a second curved part BC which is tangentially connected to the first curved part AB, at point B.
  • the shape of this second curved part BC is such that all the tangential radii emitted from the circle “emitter” 3 and falling on this curved part BC are reflected towards the left end 6a of the uniform illumination area 6.
  • FIG. 1 shows a tangential radius R2 emitted from the cylindrical light source 3 and which strikes the right half-reflector 1b at a point S from which it is reflected in the form of a radius R3 reaching the left end 6a of the uniform illumination area 6.
  • the point C which constitutes the end of the second curved part BC is located on the extreme radius R4 which is tangent to the "emitting" circle 3 and which passes through the right end 6b of the uniform illumination zone 6, c ' that is to say that which is situated on the same side as the right half-reflector 1b with respect to the plane of symmetry P.
  • each of the half-reflectors 1a, 1b makes it possible to avoid, because of the particular shape of its cross section, the maintenance of any rays trapped between the source 3 and the reflector 1, which provides an optimum light output. .
  • the upstream reflective element 1 also makes it possible to limit, in the transverse plane, the extreme light rays R1 and R4 coming from the source 3 to a given value ⁇ , adjustable as a function of the curve of the element. reflector used, depending on the one hand on the distance of the latter from the target, and on the other hand, on the width which one wishes to illuminate.
  • the upstream reflective element does not, however, allow an angular limitation of the incident rays, in the longitudinal direction. According to the present invention, this angular limitation is achieved by a downstream reflector element 5.
  • FIG. 2 This represented in FIG. 2 on a scale different from that of the reflective element 1 for reasons of space in the figure, is constituted, as shown in FIG. 2, by two symmetrical half-reflectors 5a and 5b with respect to a plane Q providing, from a rectangular planar source 7, constituted by the face of output of the reflector element 1, over a zone 6 ′, plane and perpendicular to the plane Q, located at a distance d from this source 7, uniform illumination, and angularly limited to a value ⁇ .
  • Each half-reflector has a cross section which is constituted, in the case of the left half reflector 5a, by an arc of ellipse E, having for foci the first end G, of the planar source 7, and 6d of the zone d 'uniform illumination 6 ′ and passing through the second end F of the planar source 7.
  • the left half-reflector 5a extends between the second end F of the planar source 7 and a point H situated at the intersection of the ellipse E and of the extreme direct radius R5 starting from the first end G of the planar source 7 and ending at the second end 6c of the uniform illumination zone 6 ′.
  • each ray coming from any point of the planar source 7 is reflected by the reflector 5 in the direction of the uniform illumination zone 6 ′ without that there are trapped rays between the source 7 and the reflector 5.
  • the rays R5 coming from the first end G, or right end, of the source 7 directly reach the area of uniform illumination 6 ′ or else are reflected by the left half-reflector 5a, in the direction of the first end 6d of the uniform illumination zone 6 ′, without being intercepted by the right half-reflector 5b.
  • the reflector 20 consists of an upstream reflective element 22 of the type of that of FIG. 1, and of a series of downstream reflective elements 23, the latter being obtained from a series of cylindrical elements 24, of length 1, the cross section of which is made up of three sides, a base 26 of length e1 and of two sides 26a and 26b of elliptical shape, symmetrical with respect to the perpendicular bisector of base 26.
  • the cylindrical elements 24 are arranged so that their base face, determined by the base 26 and their length 1 is in the exit plane of the upstream reflector 20, parallel to each other and perpendicular to the plane of symmetry P of the upstream reflector 20.
  • the faces reflective left 26a and right 26b, in FIG. 9, of each of these downstream reflective elements 23 are constituted respectively by the extreme right edges 26b and left 26a of two successive cylindrical elements 24.
  • the curvature of the ellipse E forming the sides 26a and 26b is determined from the angle ⁇ desired for the type of lighting that the luminaire must provide.
  • This angle ⁇ determines the ratio e2 / h representing the ratio of the spacing of two successive cylindrical elements 24 to the height h of these elements, as well as the ratio e2 / e1, where e1 represents the width of the base 26 since this latter value is linked to the height h by the equation of the ellipse E.
  • the tests carried out have shown that, most of the time, the ratio e2 / e1 was between 5 and and 20.
  • the length e1 of the base 26 of the cylindrical element 24 is determined as a function of the overall dimensions of the luminaire which it is desired to produce.
  • the ellipse E defined by its two foci G and L and by a point F of this ellipse E.
  • the points F and G constitute the two ends of the segment separating two cylindrical elements 24 successive, and the point L is formed by the intersection of an extreme radius R6 coming from the point F and incidences ⁇ , with the uniform illumination zone 33.
  • This arrangement also makes it possible to reduce, substantially, the height of the downstream reflecting means, and therefore, consequently, the size and the cost of the luminaire itself.
  • the cylindrical elements 24 forming the reflectors consist of a support made, for example, of a synthetic material, covered, preferably by metallization, with an aluminum coating, or any material with high reflecting power.
  • the present invention thus makes it possible to produce a lighting system which can, depending on specific lighting conditions desired, in a given room adapt by playing appropriately on its reflective elements.
  • the installer may have a series of cylindrical elements 24 of different profiles and dimensions which will allow him to choose, on site, at the time the type of downstream reflector element best suited to the room.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Eye Examination Apparatus (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP90401623A 1989-06-14 1990-06-12 Beleuchtungseinrichtung für eine zylindrische Lichtquelle Revoked EP0403369B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90401623T ATE102325T1 (de) 1989-06-14 1990-06-12 Beleuchtungseinrichtung fuer eine zylindrische lichtquelle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907889 1989-06-14
FR8907889A FR2648543B1 (fr) 1989-06-14 1989-06-14 Luminaire pour source lumineuse cylindrique

Publications (2)

Publication Number Publication Date
EP0403369A1 true EP0403369A1 (de) 1990-12-19
EP0403369B1 EP0403369B1 (de) 1994-03-02

Family

ID=9382717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401623A Revoked EP0403369B1 (de) 1989-06-14 1990-06-12 Beleuchtungseinrichtung für eine zylindrische Lichtquelle

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EP (1) EP0403369B1 (de)
AT (1) ATE102325T1 (de)
DE (1) DE69006929T2 (de)
FR (1) FR2648543B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2683051B1 (fr) * 1991-10-25 1993-12-24 Armines Reflecteur pour source de rayonnement a angle de rayonnement lateral maximal controle.
AU6475296A (en) * 1995-08-04 1997-03-05 Pang Teng Ong Process for producing the profile of reflectors for a cylindical source of light and reflector obtained according to thi process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT374258B (de) * 1982-10-18 1984-04-10 Zumtobel Ag Raster fuer leuchtstofflampenleuchten
EP0271150A1 (de) * 1986-12-08 1988-06-15 "Etap" Leuchtvorrichtung mit Reflektoren, die gegen hinderliche Lichtpunkte Schützen
FR2623633A1 (fr) * 1987-11-25 1989-05-26 Armines Appareil emetteur de rayonnement infrarouge comportant au moins une source cylindrique de rayons infrarouges et un reflecteur
EP0318390A1 (de) * 1987-11-25 1989-05-31 Association Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels (Armines) Apparatur für Ausstrahlung von elektromagnetischen Wellen, insbesondere für den Infrarotbereich, mit einer planaren Quelle von Strahlen und einem Reflektor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT374258B (de) * 1982-10-18 1984-04-10 Zumtobel Ag Raster fuer leuchtstofflampenleuchten
EP0271150A1 (de) * 1986-12-08 1988-06-15 "Etap" Leuchtvorrichtung mit Reflektoren, die gegen hinderliche Lichtpunkte Schützen
FR2623633A1 (fr) * 1987-11-25 1989-05-26 Armines Appareil emetteur de rayonnement infrarouge comportant au moins une source cylindrique de rayons infrarouges et un reflecteur
EP0318390A1 (de) * 1987-11-25 1989-05-31 Association Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels (Armines) Apparatur für Ausstrahlung von elektromagnetischen Wellen, insbesondere für den Infrarotbereich, mit einer planaren Quelle von Strahlen und einem Reflektor

Also Published As

Publication number Publication date
ATE102325T1 (de) 1994-03-15
EP0403369B1 (de) 1994-03-02
FR2648543A1 (fr) 1990-12-21
DE69006929T2 (de) 1994-08-25
FR2648543B1 (fr) 1991-09-06
DE69006929D1 (de) 1994-04-07

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