FR2944531A1 - Lighting stud for motor vehicle to access or exit roadway system in underground parking garage, has LED i.e. white or green power diode, for emission of light beam, and optical unit focusing beam part towards predetermined area of space - Google Patents

Abstract

The stud has an LED (21) i.e. white or green power diode, for emission of a light beam. An optical unit focuses a part of the beam towards a predetermined area of a space, where the optical unit comprises a lens (31). The optical unit defines a rear reflective surface (41) that carries out luminous reflection in the lens, where the rear surface is concave on a level of an arrival zone of the beam emanating from the LED. A front reflective surface (42) focuses another part of the beam towards another predetermined area of the space.

Description

LIGHTING PLATE TECHNICAL FIELD

The present invention relates to a lighting pad, particularly from the ground. Such a pad can, for example, be used in the field of roads and / or in the lighting, such as marking the access routes and evacuation in covered parking or underground.

PRIOR TECHNIQUES

In car parks away from the natural light of the day, it is known to equip the ground lighting studs arranged along the pathways for automobiles and / or pathways for pedestrians. Generally, a ground lighting pad comprises a set of several light-emitting diodes protected by a metal cage, a lower base and an upper arch are fixed to each other so as to define together two side windows and opposite.

The light-emitting diodes are fixed at the height of the side windows, at the lower base of the metal cage, and are directed towards the upper arch thereof. Each of the two opposite windows is closed by a protective glass capable of letting the light produced by the diodes laterally escape. Upwards, this light is stopped by the upper arch of the metal cage. Each waypoint of a way lane is oriented so that its two windows are turned generally forward and backward, having regard to the direction or one of the two directions of progression on this lane. path. Indeed, it is desired that the light escaping from the windows of each stud is visible from the previous pad and the next pad on the path. -1- 2944531 -2- So that the light emitted by a stud in operation is sufficiently perceptible from afar, the many diodes of this stud are all lit together.

SUMMARY OF THE INVENTION

The invention aims at least to allow a reduction in the power consumption of a lighting pad, without degradation of the brightness generated by this pad. According to the invention, this object is achieved by means of a lighting pad comprising at least one light-emitting diode capable of emitting a light beam and at least one optical member for concentrating at least a portion of this light beam towards a predetermined region from space. Thanks to the optical element or to the optical members, the power of the light beam is dispersed substantially less out of the useful zone (s) outside the stud. This power is therefore used much more efficiently, so that it can be reduced without loss of efficiency, which is accompanied by energy savings.

Advantageously, the optical member comprises a lens. It defines at least one reflective surface of concentration of at least a portion of the light beam.

Advantageously, one of the faces of the lens defines said reflecting surface, which is configured to perform a light reflection in the lens.

Advantageously, the reflecting surface is concave at the arrival zone of the incident beam emanating from the light-emitting diode. Advantageously, the lighting pad has at least one other reflecting surface, which is a surface of concentration of another part of the beam to another predetermined region of space. Advantageously, the lighting pad comprises another lens, one side of which defines said other reflecting surface.

Advantageously, the two lenses are globally identical. Advantageously, the two lenses are generally symmetrical to one another with respect to a plane.

Advantageously, the optical member separates the light beam into two portions, respectively a first portion and a second portion, and concentrates said first portion of the light beam toward said predetermined region of the gap.

Advantageously, the optical member deflects at least a portion of the light beam towards said predetermined region, which is angularly offset relative to an axis 15 of emission of the light beam by the light-emitting diode.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, among which: FIG. 1 is a perspective view which represents a luminous dot according to the invention and on which this light stud is out of the ground, that is to say not installed; FIG. 2 is a partially exploded view, in longitudinal section along plane II of FIG. 1; - Figure 3 is a section along the plane III of Figure 1, with perspective, and schematically shows only some elements of the upper portion of the light pad of Figure 1 without its cap; FIG. 4 is a perspective view of one of two identical lenses that comprises the head or upper portion of the light pad of FIGS. 1 and 2; FIG. 5 is a diagrammatic perspective view illustrating the role of the two lenses of the light pad of FIGS. 1 and 2; and FIG. 6 is a perspective view of the light pad of FIGS. 1 and 2 while the stud is installed in the ground and only its free-projecting portion is visible.

5 EMBODIMENTS OF THE INVENTION

In Figure 1, there is shown a safety light beacon and / or emergency, which is configured as a stud 1 lighting from the ground. This stud 1 is intended to be part of a network of several similar studs 1, arranged along one or more pathways of access or exit, so as to form together a lighting input and evacuation. The pads 1 of such a network can be installed in an underground car park or in another place likely to be plunged in total or partial darkness.

The stud 1 comprises a lower portion 2, which is intended to be below the surface of the ground, for example by being buried, and whose upper end is provided with a cover or protective cap 3 apparent. This hat 3 is intended to be in the open air and to overcome above the ground, especially in the middle or on one side of a roadway. It is therefore robust to be able to withstand mechanically large loads, the type of that constituted by a motor vehicle.

Generally symmetrical with respect to the plans II and III, the hat 3 is pierced by two lateral windows 4, which are arranged opposite each other, being turned one in one direction and the other in the opposite direction.

As can be seen in Figure 2, the lower portion 2 of the light pad 1 comprises a peripheral shell 5 of embedding in the ground. Destined to be permanently installed in the ground, this shell 5 is open on the top and delimits a receiving housing of a removable subassembly 6, the cap 3 closes, upwardly, a sealed chamber 7 so as to protect the content. The shell 5 is a mechanically welded and rigid assembly of aluminum parts. Its overall shape is that of a vertical tube provided with two flanges, namely a bottom rim 8 anchored in the ground and an upper flange which forms a fastening flange 9, and to which the cap 3 is reversibly fixed to means of two diametrically opposite two screws.

The removable subassembly 6 comprises a hermetic envelope, the cap 3 of which forms the upper portion and which furthermore comprises a vertical tube 12 and an annular glass or pane 13 in the extension of this tube 12. A seal 10 of Annular sealing and flat 14 is compressed between the upper edge of the tube 12 and the lower edge of the pane 7. Another annular and flat seal 14 is compressed between the upper edge of the pane 7 and a central portion of the cap 3 .

The annular protection pane 13 is located at least partly above the ground, at the height of the two windows 4, and passes directly behind them. It is housed in a skirt 15 that includes the cap 3 and wherein an end portion of the tube 12 is force-fitted so as to apply the compression pressure of the seals 14, directly on one of these.

Opposite the cap 3, the lower access opening inside the tube 12 is hermetically closed by a shutter, which has the shape of a removable cover 16 in the example shown and that screws are screwed in a base of the tube 12 and not visible in the figures retain in a conventional manner. A flat sealing gasket 17 is interposed and compressed between the lower edge of the tube 12 and the cover 16, so as to provide a seal therein.

The cover 16 is provided with a conventional cable gland for the sealed passage of electrical supply son, not shown for the sake of clarity. Only a portion 18 of this gland, known per se, is shown. The cap 3 can be made of cast iron or any other material giving it the desired strength. The tube 12 and the cover 16 may be made of aluminum or any other suitable material. The sealed chamber 7 contains two identical optical members 19, which are fixed to the cap 3, under this cap 3 and to the right of the windows 4, by two screws 20, so as to be symmetrical to one of the other, as can be seen in Figure 3.

Still in the sealed chamber 7, a single light-emitting diode (LED) 21 is mounted on a support 22, so as to be directed upwards and, more precisely, towards a lower entrance face 30 of the optical lens 31 that This diode 21 may, for example, be a white or green power diode, sold by the company OSRAM, under the name of dragon and the reference LW W5SM-HYJY-5K8L.

One of the optical members 19 is shown alone in FIG. 4. It comprises a lateral arm 32 for its mounting, as well as two wedging fingers 33 and 34, each of which extends downwards from one end of this mounting arm 32. Between its two ends, the mounting arm 32 is provided with a flange 35, in the center of which is pierced an orifice 36 for the passage of the rod of an assembly screw 20.

Opposite the mounting arm 32 which equips it, the lens 31 is provided with a frustoconical pin 20, which projects upwards and which forms part of complementary positioning and wedging means of the two members. optics 19 relative to each other in a symmetrical configuration. Another part of these positioning and wedging means consists of two conical holes 38, each of which is complementary to a pin 37 and provided in a curved end of a mounting arm 32, to receive this pin 37 without play. lateral. The positioning and wedging of the two optical members 19 with respect to each other also results from the fact that a flat part 39 on each finger 33 and a flat lateral face 40 of each lens 31 are applied against each other. the other.

In addition to its input face 30, the lens 31 comprises a rear face 41 and a front face 42, which is an exit face of the light rays entered by the face 30 and which, viewed from the outside, is convex by being curved at least in the horizontal planes crossing it. The rear face 41 forms a reflecting surface generally inclined relative to the horizontal. Viewed from the inside of the lens 31, this rear face 41 is concave while being curved in the horizontal and vertical planes passing through it.

The optical members 19 may be made of polycarbonate, or of polymethylmethacrylate (PMMA), or any other material suitable for the propagation of light.

As can be seen in FIG. 2, the support 22 results from the assembly, at right angles, of two rigid plates 43 and 44, each of which integrates a portion of the electronic circuit supplying the light-emitting diode 21, and which may be made of epoxy resin or other suitable material. The support 22 is immobilized in the chamber 7 by being wedged between, on the one hand the fingers 33 and 34, and on the other hand inner support legs 45 which equip the cover 16.

In FIG. 5, the reference 50 designates the diverging light beam that the light-emitting diode 21 emits upwards towards the two lenses 31. A portion 51 of the light beam 50 enters a lens 31 via its lower entrance face. 30, and is separated from the rest of this light beam 50. Another part 52 of the light beam 50 enters the other lens 31, by its lower entrance face 30, and is separated from the rest of this light beam 50 It consists of light rays, one of which, referenced 53, has been materialized in FIG. 5. A light ray 54 of the portion 51 of the light beam 50 has also been materialized in FIG. 5. After entering, each of The light rays 53 and 54 are reflected in a lens 31, by its reflecting rear face 41, so as to be directed towards the front face 42 of this lens. Each light ray 53 or 54 is then refracted at the front face 42 through which it exits the lens 31 within which it has progressed. Each rear face 41 is a reflecting face of concentration of a portion 51 or 52 of the light beam 50. Because of its convexity, each exit face 42 also concentrates a portion 51 or 52 of the light beam 50, c '. that is, reduces the divergence. Between its reflecting face 41 and its exit face 42, each lens channels a portion 51 or 52 of the light beam 50.

It follows from the above that, in addition to dividing the light beam 50, the lenses 31 focus the portions 51 and 52 of this beam mainly to two predetermined regions of space. Generally conical, these two regions are angularly offset from one another, as can be seen in FIG. 6 where they are referenced 55. More specifically, like the lenses 31, the regions 55 are generally symmetrical. one from the other in relation to plan II.

Each region 55 is also angularly offset from the vertical axis of emission 15 of the beam 50, being inclined by only a few degrees with respect to the horizontal. Indeed, especially at its reflective surface, each lens 31 deflects a portion 51 or 52 of the light beam 50, after having separated this part of the remainder of the beam, which is advantageous since a single beam 50 is thus used to illuminate two substantially opposite regions. In the example shown, each region 55 is delimited laterally by two substantially vertical planes offset from one another by twice an angle θ of the order of 15 ° from plane III. Each region 55 is also delimited, downwards, by a substantially horizontal plane and, upwardly, by a plane offset by an angle α, from this substantially horizontal plane. In the example shown, the angle a is of the order 15 °.

While the light beam 50 is produced by a single light-emitting diode with an electrical consumption of the order of only 30 W, the luminous intensity resulting from this light beam is at least 7 candelas in the regions 55, so that the French standard NF EN 60598-2-13 of November 2006 is respected. It has been found that the illumination produced by the light pad 1 is very visible in the useful regions 55, but not in any glare, which is advantageous.

Thanks to the design described above, the head of the stud 1, that is to say its part in the open air, has the advantage of being very compact. In particular, the cap 3 protrudes slightly above the ground S.

The invention is not limited to the embodiment described above. In particular, a pad according to the invention may comprise several light-emitting diodes 21 and not just one.

In addition, the reflecting surface 41 may be that of a mirror, such as a mirror formed by fixing a reflective film on a concave support surface.

Moreover, the concentration of all or part of the light beam may result only from one or more refractions by one or more lenses, without there being a reflection on a reflective surface of concentration. It can also result only from a reflection on such a reflective surface of concentration.

Claims (11)

REVENDICATIONS1. Lighting fixture comprising at least one light-emitting diode (21) for emitting a light beam (50), characterized in that it comprises at least one optical element (19) for concentrating at least one part (51). ) of the light beam (50) to a predetermined region (55) of the space. 2. Lighting fixture according to claim 1, characterized in that the optical member (19) comprises a lens (31). 3. lighting fixture according to any one of claims 1 and 2, characterized in that the optical member (19) defines at least one reflecting surface (41) of concentration of at least a portion (51) of the beam bright (50). 4. Lighting fixture according to claim 3, characterized in that a face (41) of the lens (31) defines said reflecting surface, which is configured to perform a light reflection in the lens (31). 5. A lighting fixture according to any one of claims 3 and 4, characterized in that the reflecting surface (41) is concave at the arrival zone of the incident light beam (50) emanating from the light emitting diode. 6. Lighting fixture according to any one of claims 3 to 5, characterized in that it comprises at least one other reflecting surface (41), which is a concentration surface of another part (52) of the beam (50) to another predetermined region (55) of the space. 7. A lighting fixture according to claim 6 and any one of claims 2 and 4, characterized in that it comprises another lens (31), one side defines said other reflecting surface (41). 2944531 -11- 8. Lighting fixture according to claim 7, characterized in that the two lenses (31) are identical. 9. Lighting fixture according to any one of claims 7 and 8, characterized in that the two lenses (31) are generally symmetrical to each other with respect to a plane (II). 10. Lighting fixture according to any one of the preceding claims, characterized in that the optical member (19) separates the light beam (50) 10 into two parts, respectively a first portion (51) and a second portion ( 52), and said optical member (19) concentrates said first portion (51) of the light beam (50) toward said predetermined region (55) of the gap. 11. Lighting fixture according to any one of the preceding claims, characterized in that the optical member (19) deflects at least a portion (51) of the light beam (50) to said predetermined region (55), which is angularly offset with respect to an emission axis of the light beam (50) by the light-emitting diode (21).