EP0290347A2 - High output signal light, especially for motor vehicles - Google Patents

Abstract

The invention relates to a signaling light for a motor vehicle, of the type comprising a light source (12) and deflecting means for bringing the rays emitted by the source in a direction essentially parallel to a given general direction of emission (x-x). According to the invention, the deflecting means comprise a first lens (20) in the general shape of a balloon arranged around and near the source and a second lens (30) in the general shape of a plate disposed in front of the source (12) and from the first lens (20) dirty towards the general direction of emission, the first lens comprises deflecting elements (22) for beating down at least vertically the light rays received from the source, in the direction of said second lens and the second lens (30) comprises deflecting elements (32) for folding down at least horizontally the light rays received from the first lens, in a direction essentially parallel to said general direction of emission (xx).

The invention also provides on the first lens flow distributing means to give the illuminating surface a very homogeneous light distribution in the direction of its width.

Description

The present invention relates generally to signaling lights, in particular for motor vehicles, and more particularly relates to an economical light in which the recovery of the light flux emitted by the source is increased.

An economic light is understood to mean a signaling light which, in a well known manner, does not have a reflector and comprises a light source, such as a filament lamp and a substantially flat spherical or similar Fresnel lens placed in front of the source and focused. on this one. Diffusion balls can also be provided downstream of the lens to make the beam more homogeneous.

A relatively concentrated beam of light rays is thus obtained inexpensively, making it possible to satisfy most of the photometric requirements relating to the signaling lights of motor vehicles.

However, such a fire suffers from the disadvantage that only a small part of the light flux emitted by the lamp is recovered to participate in the formation of the beam. More precisely, only the flux emitted in the solid angle covered by the Fresnel lens seen from the source is useful, the rest of the flux being irretrievably lost.

As a general rule, the recovery of the flux reached with this known fire 15 to 250 / o of the total flux emitted, depending on the size of the lens and its distance from the source.

In addition, the illuminating surface of such a light has a marked lack of homogeneity, in the sense that the areas of the lens furthest from the source receive, per unit of area, a much smaller amount of light than the areas close to the source, i.e. the optical axis. This results in a gradually decreasing luminance, and clearly perceptible, towards the edges of the illuminating surface.

The present invention aims to overcome these drawbacks of the prior art and to propose a signaling light which, while remaining inexpensive to produce, offers better recovery of the overall flux available at the source and greater homogeneity of the illuminating surface formed. .

To this end, the present invention relates to a signaling light for a motor vehicle, of the type comprising a light source and deflecting means for bringing the rays emitted by the source in a direction essentially parallel to a given general direction of emission, characterized in that the deflecting means comprise a first generally ball-shaped lens disposed around and near the source and a second generally plate-shaped lens disposed in front of the source and the first lens transversely to the general direction of emission , in that the first lens comprises deflecting elements for at least vertically bending the light rays received from the source, in the direction of said second lens and in that the second lens comprises deviating elements for at least horizontally bending the light rays , received from the first lens, in a direction essentially parallel to ladi general direction of emission.

• - la figure 1 est une vue en perspective partiellement arrachée d'un feu de signalisation selon une première forme de réalisation de l'invention,
• - la figure 2 est une vue en coupe horizontale axiale du feu de la figure 1,
• - lafigure 3 est une vue en coupe verticale axiale du feu des figures 1 et 2,
• - la figure 4 est une vue en coupe horizontale schématique d'un feu de signalisation sur laquelle est illustré un principe auxiliaire de la présente invention,
• - la figure 5 est une vue en coupe horizontale schématique d'un feu de signalisation selon une seconde forme de réalisation pratique de l'invention utilisant ce principe auxiliaire,
• - la figure 6 est une vue en coupe verticale axiale schématique du feu de la figure 5,
• - la figure 7 est une vue en perspective détaillée d'une partie du feu de signalisation des figures 5 et 6,
• - la figure 8 est une vue en coupe verticale axiale schématique d'une première variante de réalisation du feu de signalisation des figures 5 et 6,
• - la figure 9 est une vue en coupe horizontale schématique d'une seconde variante de réalisation du feu de signalisation des figures 5 et 6,
• - la figure 10 est une vue en perspective schématique partielle d'un feu sur laquelle est illustré le principe de base pour réaliser un feu de signalisation selon une troisième forme de réalisation de l'invention,
• - la figure 11 ést une vue en coupe horizontale schématique d'un feu de signalisation selon la troisième forme de réalisation de l'invention, et
• - la figure 12 est une vue en coupe verticale axiale schématique du feu de signalisation de la figure 11.

Other aspects and advantages of the present invention will appear better on reading the following description of a preferred embodiment thereof, given by way of example and made with reference to the appended drawings, in which:

• FIG. 1 is a partially cut away perspective view of a signaling light according to a first embodiment of the invention,
• FIG. 2 is a view in axial horizontal section of the light from FIG. 1,
• FIG. 3 is a view in axial vertical section of the light from FIGS. 1 and 2,
• FIG. 4 is a schematic horizontal sectional view of a signaling light on which an auxiliary principle of the present invention is illustrated,
• FIG. 5 is a diagrammatic horizontal section view of a signaling light according to a second practical embodiment of the invention using this auxiliary principle,
• FIG. 6 is a schematic axial vertical sectional view of the light in FIG. 5,
• FIG. 7 is a detailed perspective view of part of the signaling light in FIGS. 5 and 6,
• FIG. 8 is a schematic axial vertical section view of a first alternative embodiment of the signaling light of FIGS. 5 and 6,
• FIG. 9 is a schematic horizontal section view of a second alternative embodiment of the signaling light of FIGS. 5 and 6,
• FIG. 10 is a partial schematic perspective view of a light on which is illustrated the basic principle for producing a signaling light according to a third embodiment of the invention,
• FIG. 11 is a schematic horizontal section view of a signaling light according to the third embodiment of the invention, and
• - Figure 12 is a schematic axial vertical sectional view of the signaling light of Figure 11.

Referring firstly to Figures 1 to 3, a signal light according to the invention comprises a light source such as a lamp 10 provided with a filament 12 of small dimensions, a first deflecting element 20 placed around and near the source, a second deflecting element 30 of essentially flat shape and placed substantially transversely to the general direction of emission or axis lens xx of the light, as well as a closing globe 40. The first deflecting element 20 is here an element substantially in the form of a half-cylinder of vertical axis passing through the filament 12 and preferably comprising at its outer surface, a set stepped streaks 22 each extending in a semicircle in a horizontal plane.

On the optical plane, all of these streaks 22 constitute a toric Fresnel lens with a vertical axis of revolution z-z passing through the filament 12 and focused at F on the filament. It may be recalled that by "toric" is meant a volume of revolution generated by a section which rotates around an axis contained in its plane.

FIG. 3 illustrates the section in question, of the "Fresnel" type.

In practice, the ridges 22 are stepped as indicated and shown, in the manner of a Fresnel lens, in order to reduce the size of the element and the amount of material necessary to make it. Thus, the deflecting element 20 has the property of folding down each light ray coming from the source 12 in order to bring it back into an essentially horizontal plane (FIG. 3), here without affecting its orientation in bearing (FIG. 2).

In other words, it creates with respect to the other element 30 a vertical linear virtual source situated on the axis z-z.

The deflecting element 30 preferably comprises, on its inner surface, a succession of ridges 32, possibly reduced to prisms, constituting a cylindrical Fresnel lens with vertical generator and vertical focal line located in the vicinity of the axis z-z.

In this way, all the rays from the element 20 are rabbatus by the element 30, keeping the same elevation angle substantially zero, to become substantially parallel to the axis x-x and thus participate in the desired concentrated beam.

Finally, the element 40, preferably constituting the globe for closing the light, preferably comprises on its internal surface a set of spherical balls or the like 42 capable of effecting a slight diffusion of the incident parallel beams, on the one hand, so that this respects a given photometry and, on the other hand, to give a good homogeneity to the beam, by eliminating in particular for an outside observer the striated aspect of the light which can be caused by the succession on the element 30 of the streaks and their remains.

Preferably, the elements 20, 30 and 40 have approximately the same height, equal to that of the illuminating surface of the light.

A first advantage of the present invention lies in the much greater recovery of the flux emitted by the filament.

Indeed, all the rays contained in the solid angle of the first deflecting element 20, seen from the source, will usefully participate in the formation of the beam.

In practice, a flow recovery of the order of 30 to 40%, depending on the geometry of the entire light, can be obtained.

Another advantage provided by the invention resides in that the luminance on the closing globe, which defines the illuminating surface of the light, is much more homogeneous.

Indeed, it is easily demonstrated that, at any point of the output lens of the prior art, the illumination E obtained is inversely proportional to the square of the distance d between this point and the source, ie

On the other hand, with the construction of this first embodiment of the present invention, it can be demonstrated that this illumination is inversely proportional to the aforementioned distance d, ie

It is understood that this results in greater homogeneity over the entire width of the light.

There is shown in Figure 4, in schematic form, a signaling light comprising like that of Figures 1 to 3, a filament lamp 10, a flux recovery optical element 20, balloon-shaped, represented by a half circle in dotted lines, as well as a lens 30, the globe 40 not being illustrated and may in some cases be constituted by the lens 30 itself. The idea of the present embodiment is also to use the element 20 to convert a regular distribution of the light on the angular plane, as it comes from the filament 12, into a regular light distribution linearly along the inner surface of the lens 30 and therefore along the globe.

This means, in mathematical terms, that it is necessary to establish a linear relation between the angle of azimuth 0 of a radius such as R ₄ emanating from the filament and the dimension y of the point of the lens 30 encountered by this same radius R ₄ once deflected by the optical element 20. In the present example, it will be considered that the horizontal deflection is each time carried out by a plane diopter 24 formed on the external surface of the balloon, which always comprises the ridges 22 (cf. figures 1 to 3) on its inner surface.

We can note here that, to simplify this first reasoning, we place ourselves in a two-dimensional space constituted by the horizontal plane passing through the filament 12.

où k = constante.So, you have to check the relation:

where k = constant.

On en tire l'équation: π

If we consider that the angular range O ≦ θ ≦ n / 2 must be assigned to the half-width O ≦ y <Q / 2 of the globe, being the width of the latter, it follows:

We get the equation: π

• 8 : angle de la déviation impartie par le ballon 20 rayon lumineux R₄ ;
• r : rayon du ballon 20;
• p = distance entre le plan de la lentille 30 et le filament 12, on démontre que : y = r sin 0 + (p-r cos 8) .tg (0 + 8). (3)
• en combinant les équations (2) et (3), il vient :
  
  

By asking:

• 8: angle of the deviation imparted by the balloon 20 light ray R ₄ ;
• r: radius of balloon 20;
• p = distance between the plane of the lens 30 and the filament 12, we demonstrate that: y = r sin 0 + (pr cos 8) .tg (0 + 8). (3)
• by combining equations (2) and (3), it comes:
  
  

This one-to-one relationship makes it possible to deduce, for each well-defined couple (0, 8), the angle of the normal dioptre plane water, indicated at 24, performing the deviation, of course by first knowing the refractive index of the medium formed by the balloon 20, so that the deflection is carried out in accordance with the torque considered.

It is even possible to determine, for example by a method of integration in polar coordinates (p, 8), the profile of the external surface of the balloon 20 making it possible to carry out, for any angle 8, the correct deviation desired.

But this determination leads to imposing calculations which it seems superfluous to reproduce in this memoir.

FIGS. 5 to 7 show a signaling light in accordance with a second practical embodiment of the present invention, in which the principles as set out above are implemented. As can be seen in FIG. 7, the balloon 20 has the overall shape of a half-cylinder of revolution with a vertical axis, of the same height as the lens 30 and the globe, and the outer face of which has the profile diverter, constant whatever its height, as illustrated in figure 5.

In order to reduce the excess thicknesses of the balloon, its external surface has been developed, in the horizontal plane, not in a continuous profile such that it is obtained by the theoretical route mentioned above, but in a set of individual stepped streaks 24 defined each by the outer diopter carrying out the deflection and the inner diopter, not deviating in the horizontal plane, of the balloon 20.

The balloon has on its inner surface, as indicated, a set of ridges 22 in the form of horizontal semicircles, as shown in the vertical section in Figure 6, intended to deflect the light rays R ₆ from the filament so that they are folded up to the horizontal when arriving on the external face of the balloon as defined above.

If we now consider the behavior of the traffic light in a horizontal plane, we can observe that, each streak 24 having at least approximately the profile satisfying the distribution criterion as set out above, it will affect a quantity given light data corresponding to the angular extent that it covers vis-à-vis the source in the horizontal plane, a determined area of the globe, and it is understood that, from one streak to another, the ratio between the surface area of the concerned area of the globe and the luminous flux received is thus essentially constant.

In this respect, a set of light rays R ₅ has been drawn in FIG. 5 which, initially angularly distributed, are deflected by the balloon 20 so as to be finally distributed over the width of the globe. The ridges 24 can each cover the same angular extent, but preferably, their respective widths are determined solely as a function of considerations relating to the thickness of the balloon, more precisely, it is fixed for the latter (in reality for its projection in the horizontal plane) a maximum thickness and a minimum thickness, and the curve is developed which meets the distribution criterion envisaged above so that, as soon as the maximum thickness (respectively minimum) is reached, a step is formed or rung, optically inert, to return to the minimum thickness (respectively maximum) and we then continue to develop the curve, and so on. Each stripe is thus delimited by two successive steps, and has its own width.

In this respect, it can be seen in FIGS. 5 and 7 that, in the central region of the balloon, where the deviation imparted to the light rays is relatively limited, there is a convex streak of great width.

Similarly, and observing that there is a value of 8, in this case of the order of 45 °, for which the direction of the deviation imparted to the rays is reversed, the deviation gradually passing inward. as 0 increases, there is a very wide streak in this region having the approximate shape of a convex lens.

In summary, it is understood that the balloon is constituted by a set of individual deflecting elements, constituted on the inner side by a portion of one of the ridges 22 and on the outer side by a homologous portion of one of the ridges 24, each deflecting element receiving a determined quantity of luminous flux and deflecting the rays of this flux towards a one-to-one associated zone of the lens 30, so that the ratio between the flux received, proportional to the surface of said element, and the surface of said zone is essentially constant from one deflecting element to the other, that is to say that the luminance is essentially constant over the entire extent of the lens 30 and therefore of the globe.

In order to deflect the rays R _{5 again} so that they are essentially parallel to the direction of emission Ox, the lens 30 has on its internal surface, as in the case of FIGS. 1 to 3, a set of prisms 32 with generator vertical. These prisms can however of course be arranged on the outer surface of the globe.

It is observed that the most eccentric prisms 32 which receive light rays strongly inclined relative to the emission axis, are prisms with total reflection, while the prisms located in the central region of the balloon operate by refraction.

As a first approximation, the set of streaks 32 may consist of a cylindrical Fresnel lens with vertical generator having a vertical focal line located at a determined distance behind the filament 12 of the lamp.

Of course, many alternative embodiments can be envisaged for the ball. In particular, the ridges of curved profile 22, 24 formed inside and outside the balloon can be, as a first approximation, prisms. In addition, provision will be made whenever it proves necessary, if the deviation to be carried out is significant, of prisms with total reflection.

FIG. 8 shows a first variant of this second embodiment of the invention. In this signaling light, the height of the lens 30 and of the globe or sight glass is higher than that of the balloon 20, and the latter has, in axial vertical section, a curved profile whose concavity is turned towards the lamp 10, in order to recover a higher quantity of the flux emitted by the lamp upwards and downwards. More specifically, in the embodiment of Figures 5 and 6, the flow recovered and straightened by the ball was between about -45 ° and + 45 ° on either side of the horizontal plane. Here, the recovered flux is between approximately -65 ° and + 65 °, which leads to an increase in the luminous flux.

The outer surface of the balloon 20 here again comprises prisms or striations of the kind described with reference to FIGS. 5 to 7, but which this time follow the curved profile of the balloon.

It can also be noted that the horizontal streaks 22 formed inside the balloon are determined so as to each cover the same angular extent of the light flux coming from the filament, to return the considered part of the flux to an area of the globe having the same height: light rays R ₈ have been traced in FIG. 8 angularly distributed angularly in the vertical plane, which meet, after deviation, places of the lens 30 equally distributed in the direction of its height. In other words, the relationship between the angle of elevation of a ray and the vertical coordinate of its meeting point with the globe, after deviation, is essentially linear.

Consequently, the homogeneity of the luminance is obtained not only in the horizontal direction of the globe, but also in the direction of its height.

Of course, in this embodiment, prisms or streaks with a horizontal generator 34 are formed on the globe 20 to bring the light rays R ₈ , emanating from the balloon with a slight divergence, in a direction substantially parallel to the axis Ox. These prisms can be arranged on both the interior and exterior surfaces of the globe.

In this regard, the intersection of the prisms 32 and 34 formed on the lens 30 will in practice give a set of prismatic blocks of determined inclinations.

It can be noted in this respect that, in the basic embodiment of FIGS. 5 and 6, such a distribution of the flow in the vertical direction is relatively superfluous due to the relatively low angular coverage of the balloon in this direction, and the solution adopted does not in practice lead to perceptible variations in luminance in the vertical direction of the globe.

Figure 9 is a horizontal sectional view of another variant of this second embodiment of the invention, intended to better understand the basic principle of the invention. Here, the balloon 20 has on its inner surface streaks identical to the streaks 22 of Figures 1 to 3 and 6, 7, but its outer surface is profiled in accordance with the theoretical calculations presented above, without stepping intended to minimize the excess thicknesses. It can be observed that the deflecting surface 24 has, in the center region, a concave profile intended to separate the radii Rg on either side of the emission axis Ox, while the border regions are convex so instead concentrating the rays Pε towards the homologous border regions of the lenses 30 and of the globe. It will also be noted that the change of the direction of deflection takes place here for an angle 0 of approximately 60 °.

It can be specified that in practice, in particular for reasons of cost and manufacturing convenience, it will be preferable to use a collecting and distributing balloon 20 in a staged version.

Figure 10 is a schematic perspective view in which is illustrated the design of a signal light according to a third basic embodiment of the invention.

In the orthonormal coordinate system [O, x, y, z] as represented, O indicates the location of the filament of the lamp, [O ', y, z] represents the plane of the closing globe, while the balloon is diagrammed by a half-sphere of radius r.

The principle of construction of the signaling light consists in subdividing the balloon into a set of essentially prismatic elementary blocks such as 23, of orientation determined by their normal vector 9>. Preferably, each deflecting prism is constituted by the zone considered on the external surface of the balloon and by the homologous zone, in the form of a portion of sphere centered on the filament, and therefore non-deflecting, of its internal surface. Similarly, the lens 30 is subdivided into a set of blocks elementary prismatics such as 33, the prism shown operating in this case by total reflection. According to the invention, the flux received by the deflecting block 23, and constituted by a spindle surrounding the radius R _io , is affected at a predetermined location on the globe, corresponding approximately to block 33. More precisely, the orientation of the vector W of the block 23 is determined so that the initial radius Rio, the orientation of which is determined by the azimuth angle 8 and the elevation angle is deviated to meet the point of coordinates (y, z) of the globe, and the orientations of all normal vectors W are determined such that there is an at least approximately linear relationship between the angle of azimuth 0 and y, as well as possibly the angle of elevation and z, so that the luminance of the fire is homogeneous in the horizontal direction and if necessary (for a significant height of the exit window) in the vertical direction. In this way, the ratio between the surface of a considered zone of the globe and the light flux received by this zone is essentially constant whatever the zone chosen.

In the case of a light of low height where it is not necessary to ensure a linear relationship between the angle of elevation 0 and the coordinate z, and where the rays arriving on the globe are relatively close to the horizontal , the elementary prismatic blocks 33 can be replaced by prisms or streaks with vertical generatrix, as in the embodiments of FIGS. 1 to 3 and 5, 6.

Of course, those skilled in the art, with the possible assistance of computer computing means, are able to design a balloon and a globe whose optical characteristics meet the approach set out above.

There is shown in Figures 11 and 12 an embodiment of a signaling light constructed in accordance with this third aspect of the invention. It can be observed that some of the individual deflecting blocks 23 of the balloon 20 are grouped into elements in the form of lenses, convex lenses in the horizontal plane for border zones of the balloon and in the vertical plane for its central zone, and concave lenses in the horizontal plane for its central area also.

Of course, in the case where a strong deflection must be imparted to the light rays, in particular at the periphery of the balloon, certain blocks located in this region can be designed to deflect the rays by total reflection. Likewise, the prisms 33 of the lens 30 can be designed in the same way in the border regions of the latter.

As shown in Figures 5, 6, 8 and 9, the signal light according to the present invention may further comprise, to further improve the recovery of the light flux, a mirror 50 located at the rear of the lamp and in the general shape of a hemisphere centered on the filament 12 (with the exception of course of the circular passage intended for the base of the lamp 10). In this way, the rays emitted by the filament towards the rear are reflected by the mirror and pass in the vicinity of the source to reinforce the light beam. Such a mirror can of course also equip the signaling light of FIGS. 1 to 3 and 11, 12.

In addition, in order to avoid weighing down the figures, the prisms or striations 32 formed on the inner surface of the lenses 30 are not shown each time in order to bring the incident light rays in a direction essentially parallel to the direction of Ox emission. In FIGS. 4 to 12, the drawings have also been simplified by omitting the globe 40 as shown in FIGS. 1 to 3, where appropriate provided with dispersion balls 42 or the like.

In this respect, the lens 30 and the globe 40 can be produced either in the form of two separate elements, as described, or be merged into a single element in which the ridges 32 or blocks 33 are produced on its internal surface and the possible balls 42 on its outer surface, to the extent that the regulations authorize it.

Of course, the principles of the invention can be implemented in signaling lights of any type, and in particular position lights, stop lights, direction indicators, or reversing lights.

However, the invention applies more particularly to lights of this type having a large width and / or a great height, in which the lamp, for example for reasons of space, must be relatively close to the globe, and which must have a low manufacturing cost.

In particular, the invention made it possible to produce lights with a depth of only 80 mm, with an illuminating surface of 400 mm wide, of homogeneous appearance and in accordance with European regulations. In the case where the light beam must have a determined color, such as amber or red, this color can be provided by the deflecting element 20 or 30, appropriately tinted. This allows, for example for aesthetic reasons, to give the globe an at least partially colorless character.

In addition, although a toroidal deflecting element 20 extending over 180 ° has been shown in FIGS. 2 and 7, it is understood that the latter may occupy a smaller angular interval, and corresponding at least to the angular interval a, in the horizontal plane, under which the element 30 is seen from the source (Figure 2).

Furthermore, the various deflecting elements will be arranged and adapted by those skilled in the art according to each case.

Finally, the second essentially flat lens described throughout this specification may have a curved shape, for example to adapt to the profile of the surrounding body of the vehicle.

Claims (14)

1. Signaling light for a motor vehicle, of the type comprising a light source (12) and deflecting means for bringing the rays emitted by the source in a direction essentially parallel to a given general direction of emission (xx), characterized in that that the deflecting means comprise a first lens (20) in the general shape of a balloon arranged around and near the source and a second lens (30) in the general shape of a plate disposed in front of the source (12) and the first lens (20) transversely to the general direction of emission, in that the first lens comprises deflecting elements (22; 23) for bending down at least vertically the light rays, received from the source, in the direction of said second lens and in that the second lens (30) comprises deflecting elements (32; 33) for beating down at least horizontally the light rays received from the first lens, in an essentially parallel direction related to said general direction of emission (x-x). 2. Signaling light according to claim 1, characterized in that the first lens is a toric Fresnel lens (20) of axis of revolution (z-z) vertical passing through the source (12) and focused on the latter. 3. Signaling light according to claim 2, characterized in that the second lens is a cylindrical Fresnel lens (30) of vertical generator focused in the vicinity of the axis of revolution (z-z) of the first lens. 4. Signaling light according to claim 3, characterized in that the first and second lenses have approximately the same height and in that the second lens has a width much greater than its height. 5. Signaling light according to claim 4, characterized in that the first lens covers, in a horizontal plane, at least one angular interval substantially equal to the angular interval (a) occupied by the second lens (30), seen from source. 6. Signaling light according to claim 1, characterized in that the first lens (20) further comprises deflecting elements (24; 23) forming flux distributors to convert the homogeneous distribution, from the angular point of view, of the light rays received from the source (12) in a homogeneous distribution, from the linear point of view, of the light rays meeting the second lens (30) at least in the direction of the width of the latter. 7. Signaling light according to claim 6, characterized in that the deflecting elements (24; 23) forming flow distributors comprise a set of vertical prisms or streaks (24) whose respective profiles are such that they establish a relationship essentially linear between the azimuth angle (0) of a ray coming from the filament (12) and the coordinate, in horizontal direction, of the place where this ray, deflected by the first lens (20), meets the second lens (30 ). 8. Signaling light according to one of claims 6 and 7, characterized in that the deflecting elements (22; 23) of the first lens comprise a set of horizontal prisms or ridges (22) whose respective profiles are such that they establish an essentially linear relationship between the angle of elevation (p) of a ray coming from the filament (12) and the coordinate, in vertical direction, of the place where this ray, deflected by the first lens (20), meets the second lens. 9. Signaling light according to claim 6, characterized in that the first lens (20) essentially represents the shape of a hemisphere broken down into a set of elementary deflecting pavers (23), in that the second lens (30 ) is also broken down into a set of elementary deflecting blocks (33), in that the deflecting blocks (23) of the first lens are determined so as to establish an essentially linear relationship between the angles of azimuth (8) and of site (β) of the rays emitted by the source (12) and the horizontal and vertical coordinates (y, z), respectively, of the points or rays meet the second lens and in that the deflecting blocks (33) of the second lens bring back the rays coming from the first lens in a direction essentially parallel to the optical axis. 10. Signaling light according to claim 9, characterized in that each deflecting block (33) of the second lens (20) is biunivocally associated with a deflecting block (23) of the first lens. 11. Signaling light according to one of the preceding claims, characterized in that the first or the second lens is made of a tinted transparent material. 12. Signaling light according to one of the preceding claims, characterized in that it further comprises, behind the first lens (20) and the source (12), an essentially spherical mirror (50) centered on said source. 13. Signaling light according to one of the preceding claims, characterized in that it further comprises, in front of the second lens, a globe (40) comprising optical dispersion elements (42). 14. Signaling light according to one of claims 1 to 12, characterized in that the second lens (30) constitutes the globe of the light.

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