WO2000016008A1 - Attenuateur de lumiere pour appareil d'eclairage - Google Patents

Attenuateur de lumiere pour appareil d'eclairage Download PDF

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Publication number
WO2000016008A1
WO2000016008A1 PCT/GB1999/002857 GB9902857W WO0016008A1 WO 2000016008 A1 WO2000016008 A1 WO 2000016008A1 GB 9902857 W GB9902857 W GB 9902857W WO 0016008 A1 WO0016008 A1 WO 0016008A1
Authority
WO
WIPO (PCT)
Prior art keywords
elements
blade
light
side reflector
light controller
Prior art date
Application number
PCT/GB1999/002857
Other languages
English (en)
Inventor
William Mansell Shotton
Andrew Shakes
Original Assignee
Interlux Limited
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 Interlux Limited filed Critical Interlux Limited
Publication of WO2000016008A1 publication Critical patent/WO2000016008A1/fr

Links

Classifications

    • 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
    • F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs

Definitions

  • the present invention relates to a light controller for a light fitting.
  • the invention relates to a louvre element for use with a tubular lamp, for example a fluorescent tube.
  • the present invention also relates to a method of manufacturing a light controller.
  • Louvres are used to control the light output of lamps. Generally, they are designed to direct the light from the lamp so that as much as possible falls within a chosen range of output angles and with precise control of the maximum that falls outside those angles. This produces efficient lighting with minimal glare.
  • the light fitting may be designed to direct the light downwards, within an angle of about 60 ° of the vertical. This produces efficient lighting for horizontal work surfaces but minimizes glare.
  • the louvre consists of two curved side reflectors and a plurality of blades (lamellae) that extend perpendicular to the side reflectors.
  • the blades have concave lower edges and concave or straight upper edges. The concave upper edges interfere with the light beam and reduce optical efficiency, while straight edges can cause highlights (ladder effect) on the side reflectors.
  • a light controller for a light fitting including a pair of side reflector elements and a plurality of blade elements that extend between the side reflector elements.
  • each blade portion may be substantially convex. This produces a more uniform cut-off angle, thereby increasing the efficiency and reducing glare from the light fitting.
  • Each blade portion may consist of two face elements that are connected to one another at their upper edges by a bridging portion.
  • the bridging portion may be located substantially centrally between the ends of the face elements.
  • the bridging element may also serve to reflect light that would otherwise be lost into the gap between the two face elements, thereby reducing light loss and increasing the efficiency of the louvre element.
  • the bridging element may be provided with reflective wing members, to reduce losses and increase the efficiency still further.
  • the blade element may include at each end a mounting member for attaching the blade element to the side reflector elements.
  • the mounting member may include a first part that serves as pivot point and a second part that engages a detent on the side reflector element to secure the blade element to the side reflector element.
  • a method of assembling a light controller in which mounting members on both ends of each of a plurality of blades are partially engaged in corresponding mounting apertures in each of two side reflector elements, and the side reflector elements are rotated about the points of engagement of said mounting members with said side reflector elements to bring said mounting members into full engagement with said side reflector elements.
  • the assembly method is very quick and simple, and is capable of automation.
  • the blade elements may be manufactured from blanks that are connected to one another by the bridging element. This helps to simplify automation of the manufacturing process.
  • Figure 1 is a perspective view from below of a louvre element
  • Figure 2 is cross-section on line II-II of figure 1 ;
  • Figure 3 is a cross-section on line III-III of figure 2, at a reduced scale;
  • Figure 4 is a side view of a blade element;
  • Figure 5 is a cross-section on line V-V of figure 4.
  • Figure 6 is a top view of a blank for constructing a blade element, prior to folding
  • Figure 7 is a perspective view, at an enlarged scale, of part of the inner surface of a side reflector and parts of two blade elements;
  • Figure 8 is a perspective view, at an enlarged scale, of part of the outer surface of a side reflector
  • Figure 9 is a side view, at an enlarged scale, of part of the inner surface of a side reflector and one blade element;
  • Figure 10 is a schematic diagram illustrating the main steps of a process for manufacturing the blade elements
  • Figure 11 is a top view of a strip of blade blanks, prior to separation and folding;
  • Figures 12 to 14 illustrate individual steps of the process for manufacturing blade elements, on an enlarged scale
  • Figure 15 is an end view of a louvre element during assembly thereof
  • Figure 16 is an end view of a louvre element after partial assembly
  • Figure 17 is a perspective view from below of a light fitting
  • Figure 18 is a view from directly below of the light fitting.
  • a light controller in the form of a louvre element 6 is shown in Figs. 1 to 3.
  • the louvre element 6 is mounted below a tubular lamp, for example a fluorescent tube, the longitudinal axis of which is indicated by the broken line 10.
  • the louvre element consists of two side reflectors 12 that curve inwards towards one another at their upper edges and a plurality of blade elements 14 that are positioned substantially perpendicularly to the longitudinal axis 10 of the tubular lamp and extend between and interconnect the two side reflectors 12. End reflector plates 15 are attached to the two ends of the side reflector elements 12.
  • Each side reflector 12 has a side wall 16 that is highly polished or light coloured on its inner surface to serve as an efficient reflector. At the lower edge of the side wall 16 there is provided an outwards-extending flange 18 that is used when mounting the louvre element 6 in a light fitting. The lower part of the side wall 16 is pierced by a number of identical apertures 20 that are used as mounting locations for the blade elements 14.
  • the mounting apertures 20, which are shown in more detail in Figs. 7 to 9, each consist of an upper portion 22 having inclined side edges 24 and a lower portion 26 having two side edges 28 that are slightly less steeply inclined towards one another.
  • the lower portion 26 is slightly wider at its upper end than the lower end of the upper portion 22 and there is thus a small step 30 on each side of the aperture where the upper and lower portions meet. These steps 30 serve as detents for retaining the blades 14 in the mounting apertures 20, as will be described below.
  • the blade element 14 which is shown in more detail in Figs. 4 and 5, is constructed by folding a blank 35 of highly polished reflective metal, which is shown in Fig. 6.
  • the blade element 14 consists of two face elements 36, each of which has a concave hyperbolic lower edge 38 and an upper edge 40 that has convex hyperbolic central portion 42 and two substantially straight outer portions 44 that protrude slightly above the edge of the central portion 42.
  • the two face elements 36 are connected to one another at their upper edges 40 by a bridging element 46.
  • the blade element 14 is formed by first pressing the face elements 36 so that the reflective face of each has a concave parabolic surface and folding the blank along two primary fold lines 48 that connect the face elements 36 to the bridging element 46, so that the cross-sectional shape of the blade resembles approximately an inverted isosceles triangle (as shown in Fig. 5), the two similar sides of the "triangle" formed by the face elements 36 being curved slightly inwards.
  • the primary fold lines 48 connecting the bridging element to the two face elements 36 are only approximately one third the length of the bridging element 46 and the portions of the bridging element that extend beyond the fold lines comprise two flap- like wings 50 that extend outwards into the gap between the upper edges 40 of the face elements 36. These wings 50 are bent upwards along secondary fold lines 52 to_ subtend an angle ⁇ of approximately 118.75 ° (as shown in Fig. 4).
  • Each face element 36 has at each of its two ends a mounting tag 54 for engaging the mounting apertures 20 provided in the side reflector elements 12.
  • the mounting tag 54 extends outwards beyond the curved line of intersection between the blade 14 and the side reflector element 12, which is represented in the drawings by the broken line 56, and includes an upper edge 58, an outer edge 60 and a lower edge 62.
  • the outer edge 60 is substantially vertical and the upper edge 58 extends upwards towards the outer edge so that the two edges subtend an angle of approximately 45 ° .
  • a notch 64 is formed that serves as a pivot point during assembly of the louvre element.
  • the lower edge 62 is substantially horizontal, the corner where the lower edge joins the outer edge being curved or bevelled.
  • a slot 66 is provided at each end of each face portion 36.
  • the slot 66 extends approximately along the curved line of intersection 56 and includes a central portion 68 and two narrower end portions 70. In the assembled louvre, these slots 66 are engaged by the detents 30, thereby securing the blade elements 14 to the side reflector elements 12.
  • a process for manufacturing the louvre element is illustrated schematically in Fig. 10.
  • a length of polished aluminium 72 for manufacturing the blades is fed from a coil (not shown) into a blanking machine 74, which produces a continuous strip 76 of joined blade blanks (shown in more detail in Fig. 11).
  • the strip 76 is fed into a forming machine 78 that forms the parabolic curves in the face elements 36, then separates the blade blanks 35 from one another and folds each blank to form a finished blade element 14 as shown in Figs. 4 and 5.
  • the finished blade elements 14 are removed from the forming machine 78 by a first pick and place device (not shown) and placed on a track 80.
  • the track 80 twists through 180 ° , inverting the blade elements 14, which are removed one by one from the track 80 by a second pick and place device (not shown) and placed in position in a pair of side reflectors 12 at an assembly station 82.
  • the side reflectors 12 are indexed forward one place, so ⁇ that they are ready to receive the next blade element. This process is repeated until all the blade elements 14 have been located in position, and the side elements 12 are then locked to the blade elements 14 by pressing downwards on the edges of the blade elements, as described in more detail below with reference to Figs. 15 and 16.
  • the louvre element 6 is completed by attaching the end reflector plates 15 to the ends of the side reflector elements 12, for example by means of small bendable tags 84 provided on the ends of the side reflector elements (shown in Figs. 1 and 3).
  • the strip 76 of joined blade blanks produced by the blanking machine 74 is shown in more detail in Fig. 11.
  • the blade blanks are connected to one another end-to-end by the bridging element 46 that connects the two face elements 36 of each blade element to one another.
  • the fo ⁇ ning machine 78 receives the strip 76 from the blanking machine 74 and forms the parabolic curves in the face elements 36.
  • a practically perfect parabolic form is achievable owing to the fact that, apart from the short length that is connected to the bridging element 46, the upper edge 40 of each face element is unsupported.
  • the bridging element 46 is then cut, separating the blade blanks from one another but leaving the wing elements 50 attached.
  • the wing elements 50 are folded upwards along the secondary fold lines 52 and the face elements 36 are then folded downwards along the primary fold lines 48, forming the finished blade element 14 shown in Figs. 4 and 5.
  • the track 80 for carrying the blade elements 14 from the forming machine 78 to the louvre assembly station 82 is shown in more detail in Figs. 12 and 13.
  • the track has a concave surface 86 that engages the convex central portion 42 of the upper edge 40 of the blade elements 14.
  • a groove 88 which extends along the length of the track 80, is formed in this surface 86, the groove having a cross-sectional shape resembling an inverted truncated triangle.
  • the two inclined surfaces 90 of the groove 88 engage the unpolished lower surfaces of the wing elements 50, thereby retaining the blade elements 14 on the track 80.
  • the blade elements 14 are therefore retained on the track 80 without any contact between the track and the reflective surfaces of the blade elements, thereby avoiding any possibility of the surfaces being scratched.
  • the procedure for assembling the louvre element 6 at the assembly station 82 is shown in detail in Figs. 14, 15 and 16.
  • the two side reflector elements 12 are inverted and mounted on an assembly jig 92.
  • the jig 92 which is shown in cross-section, consists of a rectangular base member 94 and two inwardly inclined side members 94, the upper edges of which engage the flanges 18 of the inverted side reflector elements 12.
  • the blade elements 14 are inverted and located in position on the side reflector elements 12 with the upper corners of the mounting tags 54 engaged in the upper portions 22 of the mounting apertures 20, between the side edges 24 and the N-shaped upper edge thereof 32.
  • FIG. 17 and 18 An example of a light fitting 100 that includes the louvre element 6 is shown in Figs. 17 and 18.
  • the light fitting 100 consists of a square frame 104 containing three louvre elements 6 and two infill panels 108, each comprising a grid-like array of square lattice control elements.
  • the light fitting is mounted in a luminaire (not shown) containing three tubular fluorescent lamps that are located above and extend parallel to the longitudinal axes of the three louvre elements 6.
  • direct light output results from light that passes downwards from the lamp between the side reflector elements 12 and the blade elements 14.
  • Direct light output is controlled by the lower edges of the side reflector elements 12 and the lower and upper edges 38,40 of the blade elements 14.
  • the convex shape of the upper blade edges 40 and the concave shape of the lower blade edge 38 represent lines of intersection between the blades and cones of light emitted by the lamp, thus ensuring that the cut-off angle for direct light output is substantially uniform (i.e. independent of the viewing angle);
  • reflected light output results from light that is reflected from the highly polished surfaces of the side reflector elements 12 and the blade elements 14.
  • parabolic surfaces of these elements ensure that the light is reflected downwards to minimise glare
  • internally reflected light output results from light that travels upwards from the lamp 10, into the luminaire, and light that is reflected upwards by the bridging element 46 and the two wing elements 50. Because this light is not lost into the gaps between the blade face elements 36, the overall efficiency of the light fitting is improved. This light is reflected by polished or light-coloured internal surfaces within the luminaire and then leaves either through the louvre elements 6 or through the infill panels 108, where these are provided. This internally reflected light is highly diffused, which helps to soften the lighting effect produced by the fitting.
  • the wing elements 50 serve three purposes: they connect the blade blanks together in the strip 76, thereby simplifying the forming process; they attach the formed blade elements 14 to the track 80 without scratching of the reflective surfaces, and they increase the optical efficiency of the louvre by preventing light loss into the gaps between the face elements 36.
  • the lower edges 38 of the blade elements 14 may for aesthetic reasons be straight or convex instead of concave.
  • the louvre element may also be mounted in many other types of light fitting.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)

Abstract

L'invention concerne un atténuateur (6) de lumière pour appareil d'éclairage, lequel régulateur comprend deux éléments réflecteurs (12) latéraux et une pluralité de lames (14) s'étendant entre les éléments réflecteurs latéraux. Le bord supérieur (42) de chaque lame (14) est sensiblement convexe. Chaque lame (14) comporte deux éléments (36) de surface reliés l'un à l'autre au niveau de leur bord supérieur par une partie (46) de jonction.
PCT/GB1999/002857 1998-09-15 1999-09-14 Attenuateur de lumiere pour appareil d'eclairage WO2000016008A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9819937A GB2341669A (en) 1998-09-15 1998-09-15 Light controller for light fitting
GB9819937.5 1998-09-15

Publications (1)

Publication Number Publication Date
WO2000016008A1 true WO2000016008A1 (fr) 2000-03-23

Family

ID=10838795

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/002857 WO2000016008A1 (fr) 1998-09-15 1999-09-14 Attenuateur de lumiere pour appareil d'eclairage

Country Status (2)

Country Link
GB (1) GB2341669A (fr)
WO (1) WO2000016008A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1113219B1 (fr) * 1999-12-27 2008-01-02 Ludwig Leuchten KG Lampe

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034354A1 (fr) * 1980-02-15 1981-08-26 Siemens Aktiengesellschaft Grille-écran avec réflecteurs latéraux incurvés
DE3437192A1 (de) * 1984-10-10 1986-04-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Leuchte mit veraenderbarer lichtverteilung
WO1989007735A1 (fr) * 1988-02-18 1989-08-24 El-Selskabet Riegens A/S Procede servant a produire des structures a plaques fines telles que des reflecteurs pour installations de lampes fluorescentes
DE3902008A1 (de) * 1989-01-25 1990-08-02 Fraenkische Leuchten Gmbh Langgestrecktes leuchtenraster, insbesondere fuer leuchten mit leuchtstofflampfen
DE4109492A1 (de) * 1991-03-22 1992-09-24 Parol Leuchtenkomponenten Gmbh Leuchtenraster
EP0522480A1 (fr) * 1991-07-08 1993-01-13 Ab Fagerhult Armature lumineuse à écran anti-éblouissant et méthode de production d'un tel écran
FR2738623A1 (fr) * 1995-09-13 1997-03-14 Philips Eclairage Luminaire muni d'un louvre perfectionne

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB668693A (en) * 1949-04-29 1952-03-19 Sylvania Electric Prod Louvre construction
GB814354A (en) * 1956-09-19 1959-06-03 Leitz Ernst Gmbh Improvements in or relating to reflector arrangements for elongated tubular light sources
DE69014844T2 (de) * 1989-12-27 1995-06-29 Philips Electronics Nv Leuchte.
DE69608044T2 (de) * 1995-02-14 2001-01-11 Koninkl Philips Electronics Nv Leuchte
EP0862713B1 (fr) * 1996-10-08 2003-04-02 Koninklijke Philips Electronics N.V. Appareil d'eclairage
SE9701216L (sv) * 1997-04-04 1998-04-27 Fagerhults Ab Sätt att framställa ett bländskydd, en reflektor eller dylikt till en elektrisk belysningsarmatur samt ett bländskydd, en reflektor elle dylikt, som framställts enligt sättet

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034354A1 (fr) * 1980-02-15 1981-08-26 Siemens Aktiengesellschaft Grille-écran avec réflecteurs latéraux incurvés
DE3437192A1 (de) * 1984-10-10 1986-04-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Leuchte mit veraenderbarer lichtverteilung
WO1989007735A1 (fr) * 1988-02-18 1989-08-24 El-Selskabet Riegens A/S Procede servant a produire des structures a plaques fines telles que des reflecteurs pour installations de lampes fluorescentes
DE3902008A1 (de) * 1989-01-25 1990-08-02 Fraenkische Leuchten Gmbh Langgestrecktes leuchtenraster, insbesondere fuer leuchten mit leuchtstofflampfen
DE4109492A1 (de) * 1991-03-22 1992-09-24 Parol Leuchtenkomponenten Gmbh Leuchtenraster
EP0522480A1 (fr) * 1991-07-08 1993-01-13 Ab Fagerhult Armature lumineuse à écran anti-éblouissant et méthode de production d'un tel écran
FR2738623A1 (fr) * 1995-09-13 1997-03-14 Philips Eclairage Luminaire muni d'un louvre perfectionne

Also Published As

Publication number Publication date
GB9819937D0 (en) 1998-11-04
GB2341669A (en) 2000-03-22

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