FR2869092A1 - Lamp with directional light diffuser has series of angled plates inserted into transverse channels in transparent panel covering light source(s) - Google Patents

Abstract

Directional lamp (1), containing one or more light sources (5), is fitted with a directional light diffuser in the form of a transparent lengthwise panel (11) with a series of transverse parallel channels (19) of regular section. Each channel is fitted with a plate (13) that allows the light from the sources to be deflected in a required direction. Directional lamp (1), containing one or more light sources (5), is fitted with a directional light diffuser in the form of a transparent lengthwise panel (11) with a series of transverse parallel channels (19) of regular section. Each channel is fitted with a plate (13) that allows the light from the sources to be deflected in a required direction. The plates are simple strips of material inserted across the diagonals of the channels so they are held in place by the opposite corners and do not need to be rigid or solid. Where necessary the panel can be protected by a thick layer (9) of glass or transparent plastic.

Description

Diffuser for luminaire to direct the light emitted and

luminaire well equipped.

  The invention relates to a diffuser for a luminaire for directing the light emitted and the luminaire thus equipped.

  Traditional luminaires for directing the light in a particular direction generally comprise various light-directing devices, namely: an internal reflector called "asymmetrical" which reflects the light of the source in a given direction, or - a a lens whose ribbed or prismatic surface is calculated to deflect the luminous flux, or - an oriented lamella, deflecting the light beam in the orientation of the lamellae.

  These systems have the following drawbacks.

  The internal reflector hardly avoids a loss of light in the opposite direction to that sought. The light source as well as the internal components can remain visible from the outside and it also requires a large volume inside the luminaire, as it is located in a wide development at the rear or around the light source.

  The striated or prismatic lens makes it even more difficult to avoid a loss of light in other directions than the one sought. In addition, its development is complex and requires significant manufacturing investments.

  Oriented lamellae, whether internal or external, must be made of very resistant materials when they are accessible, and may be subject to dust and dirt. The loss of light is important, especially if the internal faces are not treated in a reflective material.

  In addition, these various light-directing devices are difficult to adapt on site to various dimensions of luminaire.

  The invention aims to overcome these drawbacks and proposes a diffuser for a luminaire for orienting the output light emitted from at least one light source, characterized in that the diffuser consists of at least one longitudinal cellular plate, substantially transparent, comprising parallel cells of regular section formed longitudinally and open at least at one end, and in at least one series of lamellae threaded parallel in said cells and turned in a predetermined orientation, so as to deflect the light emitted from this source and passing through the diffuser in said slat orientation.

  Naturally, the diffuser constitutes the front face of a housing of the luminaire, which contains said at least one light source. This front face can be cut to variable dimensions without changing its deflection capacity of the luminous flux and therefore the luminaire can be adapted without difficulty as to its design at the site that receives it.

  The slats are kept enclosed in said cells, fixed by each of their edges opposite to an edge of the cell section and need not be of rigid or solid conformation, as the external lamellar grids of the luminaires aforementioned classics. Fine strips of paper or plastic may be suitable. In addition, they are not subject to soiling and the effectiveness of the luminaire does not decrease as a result.

  The honeycomb plate may be extruded polycarbonate or other synthetic material or transparent plastic, consisting of two sheets or thin outer plates, parallel and interconnected by parallel perpendicular walls delimiting said longitudinal cells, the section of said cells being rectangular and preferably square.

  The slats may be simple strips cut longitudinally adequately, for example from a larger band, to be introduced parallel into the cells, namely a width corresponding to the insertion game near a diagonal of the rectangle or square of the cell section and of a length corresponding to that of the cell, this band being slid by the cell opening between the opposite angles of rectangle or square of the cell section and slipped into the cell all along its length. Naturally, after insertion into the cell opening of the lamella strip, this opening may be plugged or otherwise closed, for example by the frame border of the luminaire housing receiving the diffuser.

  Naturally, the orientation of the lamellae depends on the geometrical section of the cell and their arrangement in the cell and the cell section will be chosen which is suitable for the chosen orientation of the lamellae relative to the plane of the cellular plate.

  The lamellae may have a reflective inner face, for example metallised or white, and a non-reflecting external face, for example matt black or matte dark, which makes it possible to channel the luminous flux reflected by the lamellae into the orientation of the lamellae with the minimum dispersion of light.

  In the case of luminaires that may be subject to vandalism, the front face of the diffuser may be protected by a plate of hard plastic glass or thick transparent polycarbonate, the said one or more cellular plates of the diffuser can be fixed, for example glued on this protective plate and suitably disposed in the direction or directions of the luminous flux to be obtained respectively.

  In addition, the invention relates to a luminaire equipped with a diffuser as defined above.

  The invention is illustrated below by means of exemplary embodiments and with reference to the appended drawing in which: - Figure 1 is a perspective view of a luminaire according to the invention, and - Figure 2 shows in cross section an alternative embodiment.

  A protected luminaire 1 according to the invention, as represented in FIG. 1, comprises a rectangular parallelepiped-shaped box-shaped body 3 housing internal light sources 5, a front light-diffusing panel 7 and a protection plate 9 fastened to the front of the diffuser panel 7.

  The diffuser panel or diffuser which is the characteristic element of the invention consists of a transparent longitudinal cellular plate 11, provided with parallel strips 13 oriented in the desired output light beam direction.

  The cellular plate 11 is a conventional component, derived from extrusion made of polycarbonate or transparent plastic material. It consists of two thin transparent parallel plates 15 interconnected by transparent walls 17 parallel and perpendicular to the thin plates 15 and delimiting between them parallel transparent cells 19. The section of these cells 19 in the example is a square of about 6 mm side.

  The front diffuser panel 7 of rectangular format is derived from the cutting of a large format honeycomb plate (not shown) to the dimensions of the front of the luminaire. This panel comprises, according to the figure, cells 19 oriented horizontally in the present case and open at their opposite ends 21. Each of the cells comprises a thin strip 13 of plastic or metal (aluminum) or cellulosic (paper), which has been threaded by an end opening 21 of the cell. These lamellae 13, which are identical to each other, can be obtained from the cutout of a single thin plate formed for this purpose (not shown). They consist of thin flat strips cut longitudinally at a width slightly smaller than the diagonal of the square of section of the cell 19 and at a length substantially equal to that of the cell 19. These lamellae are provided with a reflective white face facing inward (not visible) and a matte black face facing outward. They are oriented downwards at 45 from the horizontal so as to deflect the light beam passing through the diffuser panel 7 coming from the light sources 5 downwards and at the same angle of 45 relative to a horizontal plane, as indicated by the arrows. .

  The diffuser panel 7 is laterally covered by the wall of the housing 3 and the openings 21 of the cells are thus closed, possibly with a seal and the lamellae are thus protected from dust and external dirt.

  The foregoing demonstrates the simplicity and ease of making a luminaire according to the invention.

  Naturally, it is very easy to cut the diffuser panel to a particular desired size, for example to accommodate a particular receiving site.

  In addition, it is possible to obtain several orientations of luminous flux of the same diffuser panel, for example by gluing on the front protection plate 9 several distinct panels in continuity with one another or not and with lamellae oriented differently from one another. to each other, and for example as shown in Figure 2, two separate panels 7a and 7b adjacent to each other to obtain two output light beams diverging from each other as indicated by the arrows.

  Optionally, the diffuser panels can be fixed mounted on a curved surface.

Claims (10)

  1. Diffuser (7) for luminaire (1) for directing the output light emitted from at least one light source (5), characterized in that it consists of at least one longitudinal cellular plate (11) ), substantially transparent, having parallel cells (19) of regular section formed longitudinally and open at least at one end (21), and in at least one series of strips (13) threaded parallel in said cells (19) and turned in a predetermined orientation, so as to deflect the light emitted from this source (5) and passing through the diffuser (7) in said orientation of the slats (13).   2. Diffuser (7) according to claim 1, characterized in that it constitutes the front face of a housing (3) of the luminaire, which contains said at least one light source (5), this front face can be cut to variable dimensions without changing its deflection capacity of the luminous flux and therefore the luminaire (1) can be adapted without difficulty as to its design at the site that receives it.   3. Diffuser according to claim 1 or 2, characterized in that the slats (13) are kept enclosed in said cells (19), fixed by each of their edges opposite to an edge of the cell section (19) and n do not need to be of rigid or solid conformation.   4. Diffuser according to one of the preceding claims, characterized in that the honeycomb plate (11) is derived from conventional extrusion polycarbonate or other synthetic material or transparent plastic, consisting of two sheets or thin parallel outer plates (15). ) interconnected by parallel perpendicular walls (17) defining said longitudinal recesses (19), the section of said cells (19) being rectangular and preferably square.   5. Diffuser according to one of the preceding claims, characterized in that the slats (13) are simple strips cut longitudinally adequately to be introduced in parallel in the cells (19), for example with a width corresponding to the set of insertion near the diagonal of the rectangle or square of the cell section (19) and of a length corresponding to that of the cell (19), this band being slid by the cell aperture (21) between the opposite angles of rectangle or square of the cell section (19) and threaded into the cell (19) along its entire length.   6. Diffuser according to one of the preceding claims, characterized in that after insertion into the cell opening (21) of the lamella strip (13), this opening (21) can be closed or closed by in another way, for example, by the border of the frame of the luminaire housing (3) receiving the diffuser.   7. Diffuser according to one of the preceding claims, characterized in that the orientation of the slats (13) depends on the geometric section of the cell (19) and their arrangement in the cell (19) and the choice of cell section (19) which is suitable for the selected orientation of the lamellae (13).   8. Diffuser according to one of the preceding claims, characterized in that the slats (13) have a reflective inner face, for example metallized or white and a non-reflective outer surface, for example matt black or matte dark, which allows channeling the light flux reflected by the slats in the orientation of the slats (13) with the minimum of light scattering.   9. Diffuser according to one of the preceding claims, characterized in that in the case of luminaires may be subject to vandalism, the front face of the diffuser is protected by a plate of thick glass or plastic or transparent polycarbonate (9), the or said diffuser honeycomb plates (7a, 7b) being attachable, for example bonded, to said protection plate (9) and suitably arranged in the direction or directions of the output luminous flux to be obtained, respectively.   10. Luminaire (1) having a light diffuser (7) according to any one of the preceding claims.