WO2012110718A1 - Lighting apparatus with conical optical block - Google Patents

Lighting apparatus with conical optical block Download PDF

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Publication number
WO2012110718A1
WO2012110718A1 PCT/FR2012/000062 FR2012000062W WO2012110718A1 WO 2012110718 A1 WO2012110718 A1 WO 2012110718A1 FR 2012000062 W FR2012000062 W FR 2012000062W WO 2012110718 A1 WO2012110718 A1 WO 2012110718A1
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WO
WIPO (PCT)
Prior art keywords
lighting apparatus
truncated cone
diode
diameter
small base
Prior art date
Application number
PCT/FR2012/000062
Other languages
French (fr)
Inventor
Bernard Julien Albert DELORME
Stéphane Albert Marcel DELORME
Original Assignee
Ld
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 Ld filed Critical Ld
Publication of WO2012110718A1 publication Critical patent/WO2012110718A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21V7/041—Optical design with conical or pyramidal surface
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • 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
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to lighting fixtures, comprising at least one light emitting diode, a heat sink disposed above the light emitting diode, and an optical block extending below the light emitting diode.
  • the invention relates to a lighting apparatus of the type mentioned above, which, while giving a better light output and a better scrolling than the known devices, allows to obtain a much more homogeneous light beam.
  • the lighting apparatus comprises a light-emitting diode of diameter d, a heat sink disposed on one side of the light-emitting diode and an optical block disposed on the opposite side of the light-emitting diode and having a reflective inner surface. flaring smoothly downwards in a conical frustum of height h and having a small base, characterized in that the reflective inner surface starts just below the light-emitting diode, the small base of the truncated cone has a right diameter less than that of the light-emitting diode, it has no diffuser and the ratio of the height h of the truncated cone to the diameter d of the diode is between 3 and 7.
  • truncated cone is meant not only a truncated cone shape proper, which is the preferred form, but also possibly a pyramidal shape, the height h being the distance between the small base and the large base, counted perpendicular to them.
  • diameter of the diode is meant the diameter of its emitting surface, the support can have any shape.
  • a single reflection of the light source constituted by the light-emitting diode is sufficient, preferably by a chip of several light-emitting diodes. preferably of power greater than 1 watt, on the optical block forming a white and specular reflector to obtain a perfectly homogeneous beam for maximum efficiency.
  • Another advantage is that, irrespective of the conicity of the reflector in the limit of current photometries, the scrolling of the source with respect to the aperture plane of the optics is clearly greater (at equivalent dimensions) than that of a parabola or an ellipse, which ensures a better visual comfort.
  • the distance, counted perpendicular to the small base, between the diode and the small base of the truncated cone is between 0 and 5 mm and preferably ranges from 0 to 0.5 mm mechanical tolerances.
  • the diameter of the small base of the truncated cone is greater than that of the diode by a value of between 0.1 and 5 mm, and preferably ranges from 0.1 to 0.5 mm.
  • the ratio between the height of the truncated cone and the diameter of the diode is from 4 to 6.
  • Figure 1 is a perspective view of a lighting apparatus according to the invention
  • Figure 2 is a sectional view of this luminaire
  • Fig. 3 is an enlarged sectional view of the top of Fig. 2.
  • the illumination apparatus shown in the figures comprises a chip 1 of light emitting diodes.
  • a heat sink 2 traversed by the son 3 power supply of the pellet 1.
  • an optical block 4 which is fixed at radiator by screws passing into housing 5.
  • This optical block is a hollow part, the inner surface of which is reflective and frustoconical.
  • the frustoconical surface 5 flares downward.
  • On the outer lower edge of the optical block are fixed two lugs 6 for receiving a fixing spring of the luminaire to a ceiling.
  • the LED used here has the particularity of emitting, through its phosphor layer and at the multiple points of distribution of the silicon substrates, a solid light emission angle of 120 °, ie 60 ° to the normal N of each substrate.
  • the LED is in its active part in the form of a disk thickness of 6 tenths of a millimeter.
  • S ( Figure 2) be one of the silicon substrates located at the peripheral boundary of the LED L of radius r to the optical axis 00 'with a light emission angle of 60 ° to the normal SN.
  • a reflected light beam has incidence defined by SI and the normal Nl to the plane M will delimit the aperture at the top
  • the point 1 thus defined, situated as close as possible to the plane Pl, makes it possible to reduce as much as possible the angle ⁇ between the incident light ray SU to the normal SN taken arbitrarily in order to obtain a useful yield close to the overall efficiency of 100% for reduced dimensions of the reflector ( Figure 2).
  • the reflected luminous efficiency of incidence defined by Sl.l and the normal 1.1-N.2 to the plane M delimit the front opening of the reflector with radius r2 to the optical axis 00 '.
  • the reflective surface can be painted with a high reflectance paint (for example, greater than 70% with respect to magnesia).

Abstract

This lighting apparatus comprises a wafer (1) of light‑emitting diodes, a device (2) for dissipating heat above the wafer and an optical block (4), whose reflecting inner surface (5) is frustoconical shaped.

Description

Appareil d'éclairage à bloc optique conique  Light apparatus with conical optical block
La présente invention .se rapporte aux appareils d'éclairage, comprenant au moins, une diode électroluminescente, un dissipateur de chaleur disposé au-dessus de la diode électroluminescente et un bloc optique s 'étendant en dessous de la diode électroluminescente .  The present invention relates to lighting fixtures, comprising at least one light emitting diode, a heat sink disposed above the light emitting diode, and an optical block extending below the light emitting diode.
Si on place une pastille de diodes électroluminescentes de puissance au foyer d'un réflecteur parabolique ou elliptique, réflecteur couramment utilisé par les constructeurs de matériel d'éclairage, on constate que le faisceau émis n'a pas l'homogénéité de celui obtenu par les lampes traditionnelles halogènes ou à décharge, bien que là encore on soit obligé de modifier l'aspect de surface des réflecteurs par des artifices, tels que facettes, satinage ou martelage, artifices qui ne suffisent pas pour la pastille de diodes électroluminescentes, car celle-ci est constituée d'un certain nombre de diodes, lesquelles placées dans un même plan se trouvent inévitablement écartées de l'axe optique (défocalisation) . Pour pallier cet inconvénient, les constructeurs n'ont d'autre choix que de placer à l'avant de la source un écran diffusant, mais qui a aussi pour effet de réduire de 30% le rendement de l'appareil. L'invention vise un appareil d'éclairage du type mentionné ci-dessus, qui, tout en donnant un meilleur rendement lumineux et un meilleur défilement que les appareils connus, permet d'obtenir un faisceau lumineux bien plus homogène. If we put a pellet of light-emitting diodes at the focus of a parabolic or elliptical reflector, a reflector commonly used by lighting equipment manufacturers, we note that the emitted beam does not have the homogeneity of that obtained by the traditional halogen or discharge lamps, although again it is necessary to change the surface appearance of the reflectors by artifices, such as facets, satin or hammering, artifices that are not sufficient for the light-emitting diode chip, because this it consists of a number of diodes, which placed in the same plane are inevitably removed from the optical axis (defocus). To overcome this disadvantage, manufacturers have no choice but to place at the front of the source a diffusing screen, but which also has the effect of reducing by 30% the performance of the device. The invention relates to a lighting apparatus of the type mentioned above, which, while giving a better light output and a better scrolling than the known devices, allows to obtain a much more homogeneous light beam.
Suivant l'invention, l'appareil d'éclairage comprend une diode électroluminescente de diamètre d, un dissipateur de chaleur disposé d'un côté de la diode électroluminescente et un bloc optique disposé du côté opposé de la diode électroluminescente et ayant une surface intérieure réfléchissante s 'évasant de manière régulière vers le bas en tronc de cône de hauteur h et ayant une petite base, caractérisé en ce que la surface intérieure réfléchissante commence juste en dessous de la diode électroluminescente, la pètite base du tronc de cône a un diamètre juste inférieur à celui de la diode électroluminescente, il n'a pas de diffuseur et le rapport de la hauteur h du tronc de cône au diamètre d de la diode est compris entre 3 et 7. According to the invention, the lighting apparatus comprises a light-emitting diode of diameter d, a heat sink disposed on one side of the light-emitting diode and an optical block disposed on the opposite side of the light-emitting diode and having a reflective inner surface. flaring smoothly downwards in a conical frustum of height h and having a small base, characterized in that the reflective inner surface starts just below the light-emitting diode, the small base of the truncated cone has a right diameter less than that of the light-emitting diode, it has no diffuser and the ratio of the height h of the truncated cone to the diameter d of the diode is between 3 and 7.
Par tronc de cône, on entend, non seulement une forme en tronc de cône proprement dite, qui est la forme préférée, mais aussi éventuellement une forme pyramidale, la hauteur h étant la distance entre la petite base et la grande base, décomptée perpendiculairement à celles-ci. By truncated cone is meant not only a truncated cone shape proper, which is the preferred form, but also possibly a pyramidal shape, the height h being the distance between the small base and the large base, counted perpendicular to them.
Par diamètre de la diode, on entend le diamètre de sa surface émissive, le support pouvant avoir n'importe quelle forme. L'expérience montre qu'il suffit d'une seule réflexion de la source lumineuse constituée par la diode électroluminescente, de préférence par une pastille de plusieurs diodes électroluminescentes, . de préférence de puissance supérieure à 1 watt, sur le bloc optique formant un réflecteur blanc et spéculaire pour obtenir un faisceau parfaitement homogène pour un rendement maximum. Un autre avantage est que, quelle que soit la conicité du réflecteur dans la limite des photométries courantes, le défilement de la source par rapport au plan d'ouverture de l'optique est nettement supérieur (à dimensions équivalentes) à celui d'une parabole ou d'une ellipse, ce qui assure un meilleur confort visuel. By diameter of the diode is meant the diameter of its emitting surface, the support can have any shape. Experience shows that a single reflection of the light source constituted by the light-emitting diode is sufficient, preferably by a chip of several light-emitting diodes. preferably of power greater than 1 watt, on the optical block forming a white and specular reflector to obtain a perfectly homogeneous beam for maximum efficiency. Another advantage is that, irrespective of the conicity of the reflector in the limit of current photometries, the scrolling of the source with respect to the aperture plane of the optics is clearly greater (at equivalent dimensions) than that of a parabola or an ellipse, which ensures a better visual comfort.
On a le meilleur défilement, parce que la petite base du tronc de cône a sensiblement le même diamètre que la pastille de diodes électroluminescentes et parce que la surface intérieure réfléchissante commence juste en dessous de la diode électroluminescente pour ne pas avoir de perte de lumière. It has the best run, because the small base of the truncated cone has substantially the same diameter as the light emitting diode chip and because the reflective inner surface starts just below the light emitting diode to not have light loss.
Par juste en dessous, on entend que la distance, décomptée perpendiculairement à la petite base, entre la diode et la petite base du tronc de cône est comprise entre 0 et 5 mm et, de préférence, va de 0 à 0,5 mm compte tenu des tolérances mécaniques. De même, le diamètre de la petite base du tronc de cône est plus grand que celui de la diode d'une valeur comprise entre 0, 1 et 5 mm et, de préférence, va de 0,1 à 0,5 mm. De préférence, le rapport entre la hauteur du tronc de cône et le diamètre de la diode va de 4 à 6. By just below, it is meant that the distance, counted perpendicular to the small base, between the diode and the small base of the truncated cone is between 0 and 5 mm and preferably ranges from 0 to 0.5 mm mechanical tolerances. Likewise, the diameter of the small base of the truncated cone is greater than that of the diode by a value of between 0.1 and 5 mm, and preferably ranges from 0.1 to 0.5 mm. Preferably, the ratio between the height of the truncated cone and the diameter of the diode is from 4 to 6.
On a obtenu de bons résultats lorsque l'angle de l'axe du tronc de cône avec une génératrice est compris entre 15 et 35° ou entre 20 et 40°. Good results have been obtained when the angle of the axis of the truncated cone with a generatrix is between 15 and 35 ° or between 20 and 40 °.
Aux dessins annexés, donnés uniquement à titre d'exemple : In the accompanying drawings, given solely by way of example:
la figure 1 est une vue en perspective d'un appareil d'éclairage suivant l'invention ; la figure 2 est une vue en coupe de cet appareil d'éclairage ; et Figure 1 is a perspective view of a lighting apparatus according to the invention; Figure 2 is a sectional view of this luminaire; and
la figure 3 est une vue en coupe à plus grande échelle du haut de la Figure 2. L'appareil d'éclairage représenté aux figures comprend une pastille 1 de diodes électroluminescentes. Sur la face supérieure de la pastille 1 est disposé un dissipateur 2 de chaleur traversé par les fils 3 d'alimentation en électricité de la pastille 1. En dessous de la pastille 1 de diodes électroluminescentes est disposé un bloc 4 optique, qui est fixé au radiateur par des vis passant dans des logements 5. Fig. 3 is an enlarged sectional view of the top of Fig. 2. The illumination apparatus shown in the figures comprises a chip 1 of light emitting diodes. On the upper face of the pellet 1 is disposed a heat sink 2 traversed by the son 3 power supply of the pellet 1. Below the pellet 1 of light emitting diodes is arranged an optical block 4, which is fixed at radiator by screws passing into housing 5.
Ce bloc optique est une pièce creuse, dont la surface 5 intérieure est réfléchissante et tronconique. La surface 5 tronconique s'évase vers le bas. Sur le bord inférieur extérieur du bloc optique sont fixées deux pattes 6 de réception d'un ressort de fixation de l'appareil d'éclairage à un plafond. This optical block is a hollow part, the inner surface of which is reflective and frustoconical. The frustoconical surface 5 flares downward. On the outer lower edge of the optical block are fixed two lugs 6 for receiving a fixing spring of the luminaire to a ceiling.
La LED ici utilisée a la particularité d'émettre au travers de sa couche de substance luminescente et aux points multiples de répartition des substrats de silicium un angle solide d'émission lumineuse de 120°, soit 60° à la normale N de chaque substrat. La LED se présente en sa partie active sous la forme d'un disque d'épaisseur de 6 dixièmes de millimètres. Soit S (Figure 2) l'un des substrats de silicium situé à la limite périphérique de la LED L de rayon r à l'axe optique 00' avec un angle d'émission lumineuse de 60° à la normale SN. The LED used here has the particularity of emitting, through its phosphor layer and at the multiple points of distribution of the silicon substrates, a solid light emission angle of 120 °, ie 60 ° to the normal N of each substrate. The LED is in its active part in the form of a disk thickness of 6 tenths of a millimeter. Let S (Figure 2) be one of the silicon substrates located at the peripheral boundary of the LED L of radius r to the optical axis 00 'with a light emission angle of 60 ° to the normal SN.
Un rayon lumineux réfléchi a d'incidence défini par SI et la normale N.l au plan M délimitera l'ouverture au sommet du réflecteur de rayon r.l. Le point 1 ainsi défini, situé au plus près du plan P.l, permet de réduire au maximum l'angle γ compris entre le rayon lumineux incident SU à la normale SN pris arbitrairement afin d'obtenir un rendement utile proche du rendement global de 100% pour des dimensions réduites du réflecteur (Figure 2). Ainsi, le rendement lumineux réfléchi a.l d'incidence défini par Sl.l et la normale 1.1-N.2 au plan M délimitera l'ouverture avant du réflecteur avec r .2 de rayon à l'axe optique 00'. A reflected light beam has incidence defined by SI and the normal Nl to the plane M will delimit the aperture at the top The point 1 thus defined, situated as close as possible to the plane Pl, makes it possible to reduce as much as possible the angle γ between the incident light ray SU to the normal SN taken arbitrarily in order to obtain a useful yield close to the overall efficiency of 100% for reduced dimensions of the reflector (Figure 2). Thus, the reflected luminous efficiency of incidence defined by Sl.l and the normal 1.1-N.2 to the plane M delimit the front opening of the reflector with radius r2 to the optical axis 00 '.
La surface réfléchissante peut être peinte par une peinture à grand pouvoir de réflexion (par exemple, supérieur à 70% par rapport à la magnésie. The reflective surface can be painted with a high reflectance paint (for example, greater than 70% with respect to magnesia).

Claims

REVENDICATIONS
Appareil d'éclairage comprenant une diode (1) électroluminescente de diamètre (d) , un dissipateur (2) de chaleur disposé d'un côté de la diode (1) électroluminescente et un bloc (4) optique disposé du côté opposé de la diode (1) électroluminescente, le bloc et ayant une surface intérieure réfléchissante s 'évasant de manière régulière vers le bas en tronc de cône de hauteur (h) et ayant une petite base, caractérisé en ce que : Lighting apparatus comprising a light-emitting diode (1) of diameter (d), a heat sink (2) disposed on one side of the light-emitting diode (1) and an optical block (4) disposed on the opposite side of the diode (1) electroluminescent, the block and having a reflective inner surface flaring smoothly downwards in a conical truncated height (h) and having a small base, characterized in that:
- la surface (5) intérieure réfléchissante commence juste en dessous de la diode (1) électroluminescente, the reflective inner surface (5) begins just below the electroluminescent diode (1),
- la petite base du tronc de cône a un diamètre juste supérieur à celui de la diode (1) électroluminescente , the small base of the truncated cone has a diameter just greater than that of the electroluminescent diode (1),
- il n'y a pas diffuseur,  - there is no diffuser,
- le rapport de la hauteur (h) du tronc de cône au diamètre (d) de la diode est compris entre 3 et 7.  the ratio of the height (h) of the truncated cone to the diameter (d) of the diode is between 3 and 7.
Appareil d'éclairage suivant la revendication 1, caractérisé en ce que la distance entre la diode et la petite base du tronc de cône est comprise entre 0 et 5 mm. Lighting apparatus according to Claim 1, characterized in that the distance between the diode and the small base of the truncated cone is between 0 and 5 mm.
Appareil d'éclairage suivant la revendication 2, caractérisé en ce que la distance entre la diode et la petite base du tronc de cône est comprise va de 0 à 0 , 5 mm. Lighting apparatus according to claim 2, characterized in that the distance between the diode and the small base of the truncated cone is 0 to 0.5 mm.
4. Appareil d'éclairage suivant l'une des revendications précédentes, caractérisé en ce que le diamètre de la petite base du tronc de cône est plus grand que celui de la diode d'une valeur comprise entre 0,1 et 5 mm. 4. Lighting apparatus according to one of the preceding claims, characterized in that the diameter of the small base of the truncated cone is larger than that of the diode with a value between 0.1 and 5 mm.
5. Appareil d'éclairage suivant la revendication 4, caractérisé en ce que le diamètre de la petite base du tronc de cône va de 0,1 à 0,5 mm. 5. Lighting apparatus according to claim 4, characterized in that the diameter of the small base of the truncated cone is from 0.1 to 0.5 mm.
6. Appareil d'éclairage suivant l'une des revendications précédentes, caractérisé en ce que l'angle de l'axe du tronc de cône avec une génératrice est compris entre 15 et 35 ° . 6. Lighting apparatus according to one of the preceding claims, characterized in that the angle of the axis of the truncated cone with a generator is between 15 and 35 °.
7. Appareil d'éclairage suivant l'une des revendications 1 à 5, caractérisé en ce que l'angle de l'axe du tronc de cône avec une génératrice est compris entre 20 et 40°. 7. Lighting apparatus according to one of claims 1 to 5, characterized in that the angle of the axis of the truncated cone with a generator is between 20 and 40 °.
8. Appareil d'éclairage suivant l'une des revendications précédentes, caractérisé en ce que le rapport de la hauteur du tronc de cône au diamètre de la diode est compris entre 3 et 7. 8. Lighting apparatus according to one of the preceding claims, characterized in that the ratio of the height of the truncated cone to the diameter of the diode is between 3 and 7.
9. Appareil d'éclairage suivant la revendication précédente, caractérisé en ce que le rapport entre la hauteur du tronc de cône et le diamètre de la diode va de 4 à 6. 9. Lighting apparatus according to the preceding claim, characterized in that the ratio between the height of the truncated cone and the diameter of the diode is from 4 to 6.
10. Appareil d'éclairage suivant l'une des revendications précédentes, caractérisé en ce que la surface réfléchissante du réflecteur est une surface peinte par une peinture à grand pouvoir de réflexion. 10. Lighting apparatus according to one of the preceding claims, characterized in that the reflective surface of the reflector is a surface painted with a high reflection paint.
PCT/FR2012/000062 2011-02-17 2012-02-16 Lighting apparatus with conical optical block WO2012110718A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1100486A FR2971832A1 (en) 2011-02-17 2011-02-17 TAPERED OPTICAL BLOCK LIGHTING APPARATUS
FR11/00486 2011-02-17

Publications (1)

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WO2012110718A1 true WO2012110718A1 (en) 2012-08-23

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