EP3045802A1 - Signalling beacon with a deflector - Google Patents

Abstract

The invention relates to a light projector for producing a directional light sheet, comprising: an elongated cylindrical lens (22), a linear light source (16) parallel to the generative direction, extending over all or part of the length of the lens to emit a luminous flux towards the lens, the lens being able to generate a main light sheet by concentrating the luminous flux in a predefined angular sector of area (100) around the horizontal generative direction, a rectangular plate-shaped deflector (28) positioned on the opposite side to the light source (16), the longitudinal sides being parallel to the generatrix direction, the transverse sides being oriented around the generating direction at an angle of elevation contained in the angular sector of predefined site, so as to interrupt light rays (31) oriented outside the angular sector (100) of the main light ply. The invention also relates to a signaling beacon comprising such a projector.

Description

Technical area

The invention relates to the field of signaling devices, in particular for the aerial signaling of high-voltage lines, airport buildings, factory chimneys, cranes, wind turbines and pylons.

Technological background

Signaling devices for aircraft are used on cables and / or obstacles in elevation. Such signaling devices may in particular comprise cylindrical lenses in order to emit light that is focused in a predefined direction, as illustrated by FIG. FR-A-2895779 .

summary

• une lentille cylindrique allongée dont la forme cylindrique est définie par une direction génératrice horizontale et par une courbe directrice,
• une source lumineuse linéaire parallèle à la direction génératrice, s'étendant sur tout ou partie de la longueur de la lentille cylindrique pour émettre un flux lumineux en direction de la lentille cylindrique,
• la lentille cylindrique étant apte à générer une nappe lumineuse principale en concentrant le flux lumineux dans un secteur angulaire de site prédéfini autour de la direction génératrice horizontale en direction de l'espace situé du côté opposé de la lentille cylindrique par rapport à la source lumineuse, et étant apte à projeter le flux lumineux dans un secteur angulaire azimutal prédéfini autour de la direction verticale,
• un déflecteur positionné dans l'espace situé du côté opposé à la source lumineuse, le déflecteur ayant une forme de plaque rectangulaire, les côtés longitudinaux du déflecteur étant parallèles à la direction génératrice, les côtés transversaux du déflecteur étant orientés autour de la direction génératrice selon un angle de site contenu dans le secteur angulaire de site prédéfini de la nappe lumineuse principale, de façon à interrompre des rayons lumineux issus de la source lumineuse et orientés en dehors du secteur angulaire de site de la nappe lumineuse principale

An idea underlying the invention is to provide a light emitting beacon that can cover all airspace without being inconvenient for residents. According to one embodiment, the invention provides a light projector for producing a directional light sheet, the projector comprising:

• an elongate cylindrical lens whose cylindrical shape is defined by a horizontal generatrix direction and a guide curve,
• a linear light source parallel to the generative direction, extending over all or part of the length of the cylindrical lens to emit a luminous flux towards the cylindrical lens,
• the cylindrical lens being able to generate a main light sheet by concentrating the luminous flux in a predefined angular sector of site around the horizontal generative direction towards the space situated on the opposite side of the cylindrical lens with respect to the light source, and being able to project the luminous flux in a predefined azimuth angular sector around the vertical direction,
• a deflector positioned in the space on the opposite side of the light source, the deflector having a rectangular plate shape, the longitudinal sides of the deflector being parallel to the generatrix direction, the transverse sides of the deflector being oriented around the generatrix direction a angle of elevation contained in the predefined angular sector of the main light sheet so as to interrupt light rays coming from the light source and oriented outside the angular sector of the main light sheet

Thanks to these characteristics, the luminous intensity emitted by the projector outside the main sheet can be reduced. For example, the luminous intensity at -10 ° of elevation angle is made less than 3% of the luminous intensity emitted at the 0 ° elevation angle, which corresponds for example to the horizontal.

According to embodiments, such a light projector may include one or more of the following features.

The guide curve of the lens can have many shapes, for example circular, elliptical, polygonal or other.

According to one embodiment, the guide curve has a substantially trapezoidal overall shape, the small base of the trapezium being oriented towards the light source and the large base of the trapezium being oriented in the direction of the light sheet,
the steering curve having a recess defining a groove parallel to the generator on the small base of the trapezium, the bottom wall of the groove being a convex surface,
the other two sides of the trapezium defining two inclined convex outer surfaces of the cylindrical lens, the two outer surfaces being able to reflect the light rays so as to fold the light rays in the angular sector of the main light sheet site.

According to one embodiment, the large base of the trapezium is about 56 mm, the small base of 20 mm and the length of the cylindrical lens of about 200 mm.

According to one embodiment, the cylindrical lens has a horizontal plane of symmetry.

According to one embodiment, the linear source is included in the horizontal plane of symmetry.

According to one embodiment, the angular sector of the site is defined as the angular sector in which the luminous intensity is greater than 50% of the luminous intensity in the center of the luminous sheet, the azimuth angular sector is defined as the angular sector. in which the luminous intensity is greater than 50% in the center of the luminous sheet, and
the width of the angular sector of site is less than 10 °, preferably less than 3 °.

Thanks to these characteristics of concentration of the light energy in an angular sector of site, the energy consumed by the beacon is optimized.

According to one embodiment, the deflector is a metal blade.

The deflector can have any size adapted to its purpose. According to a preferred embodiment, the length of the deflector is substantially equal to the length of the lens. Preferably, the deflector must cover all the solid angle in which there is a stray light. The deflector may also consist of several plates.

According to one embodiment, the ratio between the length of the deflector and the width of the deflector is about 2 to 20.

According to one embodiment, the ratio between the length of the deflector and the thickness of the deflector is about 100 to 1000. Thanks to these characteristics, the total mechanical bulk of the beacon is limited while allowing to overcome the parasitic light rays.

Thanks to this positioning, the interruption of the parasitic light is statistically improved.

The positioning of the deflector with respect to the lens can be chosen according to the specific properties of the emitted light, for example by means of experimental measurements.

According to one embodiment, the deflector is distant from a horizontal plane containing the light source, with a distance of less than 25% from the largest vertical dimension of the cylindrical lens.

According to one embodiment, the invention also comprises a light beacon comprising a support and a plurality of the aforementioned luminous projectors fixed on the support, the projectors being oriented in distinct directions around a vertical axis so that the azimuth angular sectors of the projectors cover 360 ° around the vertical axis.

Some aspects of the invention start from the idea of obstructing the light beams directed in the directions below -10 ° of elevation angle with respect to the central direction of the main light ply without obstructing the light ply around the central site angle. The light beams directed in the directions less than -10 ° of elevation angle may in particular be derived from parasitic reflections in the cylindrical lens.

Brief description of the figures

• La Figure 1 est un schéma d'une balise de signalisation lumineuse montée sur un poteau d'axe vertical z.
• La Figure 2 est une vue de dessus d'un mode de réalisation de la balise qui comprends 6 projecteurs.
• La Figure 3 est une vue en perspective de l'optique cylindrique d'un projecteur de la balise selon un mode de réalisation.
• La Figure 4 est une vue de dessus d'une barrette de LEDs qui se fixe sur l'optique cylindrique du projecteur représenté sur la Figure 3.
• La Figure 5 représente, de face, l'assemblage de l'optique cylindrique du projecteur et de la barrette de LEDs représentés respectivement par les Figures 3 et 4.
• La Figure 6 est une coupe selon le plan VI-VI de l'assemblage représenté sur la Figure 5, sur laquelle sont représentées les trajectoires des faisceaux lumineux issus d'une LEDs à travers l'optique cylindrique.
• La Figure 7 représente une coupe selon le plan VI-VI de l'optique cylindrique sur laquelle est représentée en projection les faisceaux lumineux issus de la LED centrale de la barrette de LEDs dans la direction d'angle d'azimut 45° à travers l'optique.
• La Figure 8 est un graphe qui représente la mesure de l'intensité lumineuse issue d'un projecteur à l'angle de site -10°, en fonction de l'angle d'azimut, pour un projecteur muni d'un déflecteur et pour un second projecteur identique au premier, non muni d'un déflecteur.
• La Figure 9 représente les courbes iso-intensité de la lumière issue d'un projecteur non muni d'un déflecteur.
• La Figure 10 représente les courbes iso-intensité de la lumière issue d'un projecteur muni d'un déflecteur.

The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly in the course of the following description of several particular embodiments of the invention, given solely for illustrative and non-limiting purposes. with reference to the accompanying drawings.

• The Figure 1 is a diagram of a luminous signaling beacon mounted on a pole of vertical axis z.
• The Figure 2 is a top view of an embodiment of the beacon that includes 6 projectors.
• The Figure 3 is a perspective view of the cylindrical optics of a beacon projector according to one embodiment.
• The Figure 4 is a top view of a bar of LEDs which is fixed on the cylindrical optics of the projector represented on the Figure 3 .
• The Figure 5 represents, from the front, the assembly of the cylindrical optics of the headlamp and of the array of LEDs respectively represented by the Figures 3 and 4 .
• The Figure 6 is a section along the plane VI-VI of the assembly represented on the Figure 5 , on which are represented the trajectories of the light beams from an LEDs through the cylindrical optics.
• The Figure 7 represents a section along the plane VI-VI of the cylindrical optics on which is represented in projection the light beams coming from the central LED of the LED strip in the direction of 45 ° azimuth angle through the optics.
• The Figure 8 is a graph that represents the measurement of luminous intensity from a searchlight at the -10 ° angle of view, as a function of the azimuth angle, for a projector equipped with a deflector and for a second searchlight identical to the first, not equipped with a deflector.
• The Figure 9 represents the iso-intensity curves of the light coming from a projector without a deflector.
• The Figure 10 represents the iso-intensity curves of light from a projector equipped with a deflector.

Detailed description of embodiments

With reference to the figure 1 , a signaling beacon 1 mounted on a pole 2 of vertical axis z planted in the ground 4 is shown. The beacon 1 emits a light layer 3 all around the vertical axis, which corresponds to an azimuthal angular sector Φ of 360 °. The light sheet 3 is represented by dashes. The light sheet 3 is concentrated in an angular sector of angle of elevation site s centered on a central direction, which is for example a horizontal plane 5 or slightly inclined relative to the horizontal. The light sheet 3 has for example a light intensity of 20,000 cd in white color and 2000 cd in red color. The light intensity and color can be adjusted according to the daytime or nighttime period. This beacon 1 allows in particular an aerial signaling intended for aircraft.

In an illustrative example, with reference to the Figure 2 , the signaling beacon 1 is shown in more detail. Such a tag has six projectors 6 each having a linear light source. In this illustrative example, the linear light source is a strip of light diodes 16 and a cylindrical optic 7. The projectors 6 are arranged in a plane perpendicular to the axis z, so that the diode strips 16 form a regular polygon and emit light to the outside of the regular polygon. Each projector 6 emits an elementary luminous sheet in a defined azimuth angular sector. The beacon emits a 360 ° directional luminous sheet corresponding to the addition of the elementary luminous layers of each projector 6 of the beacon 1. For this, the minimum azimuth angular sector of each of the six projectors 6 is 360 ° divided by the number 6. In this illustrative example the beacon comprises six projectors 6, so the minimum azimuthal angular sector is 60 °, that is to say 360 ° / 6. In this illustrative example, the beacon 1 has a space requirement of about 50 cm. The assembly formed by the diode bar 16 and the cylindrical lens 7 is protected, for each projector, by an opaque metal module 8 open in the direction of light emission. The opening of the module can be covered with a window that does not deflect the light, to protect the cylindrical lens from dust.

In an illustrative example, with reference to the Figure 3 a cylindrical lens 7 of projector 6 is shown. The cylindrical lens 7 has a length L. The cylindrical shape is defined by a horizontal generatrix direction 9 and a guide curve 10. The cylindrical lens 7 has two end faces 20 perpendicular to the generatrix 9 of the cylinder. The cylindrical lens 7 is mainly made of polycarbonate. In this illustrative example, the cylindrical lens 7 is about 200mm. The guide curve 10 has a global shape that is substantially that of a trapezium. The large base 22 of the trapezoid is about 56mm and the small base 21 of the trapezium is about 25mm. The sides 11 of the trapezoid define two inclined convex outer surfaces 12 of the cylindrical lens. The shape of the guide curve 10 will be explained later in more detail with reference to the Figure 6 . The cylindrical lens 7 has orifices 13 on a support 19. The orifices 13 are intended to receive fixing means fixing the cylindrical lens 7 and a bar of diodes 16 such as that shown in FIG. Figure 4 .

In this illustrative example, the diode bar 16 has diodes 14, 15 aligned linearly on a plate 17 so as to constitute a source linear luminous. The diodes of the strip 16 are red diodes 14 spaced successively from each other by four respective white diodes. The bar 16 also has orifices 18 in order to be fixed on the support 19 of the cylindrical lens illustrated on FIG. Figure 3 in superposition of the orifices 13 present on the support 19.

The Figure 5 represents a diagram of the assembly of the cylindrical lens 7 shown in FIG. Figure 3 and the diode array 16 shown on the Figure 4 . The diode array 16 is fixed on the cylindrical lens 7 so that the surface of the cylindrical lens 7 defined by the small base 21 of the trapezium is opposite the face of the diode array 16 which emits light. light.

The following figures show in more detail the structure of a projector 6 in operation, the projector 6 comprising the cylindrical lens 7 as represented on FIG. Figure 3 and the diode array 16 as shown in FIG. Figure 4 . The projector 6 is in operation when the diodes 14, 15 of the diode array 16 emit light.

The Figure 6 is a section along the plane VI-VI of the assembly represented on the Figure 5 , on which are represented the trajectories of the light beams from the diode 15 through the cylindrical optics.

The small base 21 of the trapezium is oriented towards the diode 15. The large base 22 of the trapezium is oriented in the direction of the light sheet. The guide curve 10 has a recess 23 on the small base 21 of the trapezium. This recess defines a groove parallel to the generatrix 9 on the cylindrical lens 7. The bottom wall of the groove is a convex surface 24 in order to converge the rays coming from the diode array 16 in the form of the elementary luminous sheet. In the section plane VI-VI, the rays 26 coming from the diode 15 in an angular sector of a site centered approximately on the direction perpendicular to the bar 16 are thus coupled to the convex interface 24 and concentrated by a second convex interface 25 located on the large base 22 of the trapezium, after having propagated in the cylindrical lens substantially perpendicularly to the generator 9. The light rays 26 and come out of the cylindrical lens 7 in an angular sector of site centered about the direction perpendicular to the bar 16.

The light rays 27 from the diode 15 in the plane VI-VI and in the 45 ° direction of the perpendicular to the bar 16 are coupled by the side edges of the recess 23 and folded towards the sides 11 of the trapezium. The surfaces of the two sides 11 reflect the light rays due to the incidence of light rays on these surfaces. The reflected rays are thus folded in the direction approximately perpendicular to the bar 16, so that they emerge from the lens 7 by the large base 22 of the trapezium, passing through a non-convex interface, in an angular sector of site centered about the direction perpendicular to the bar 16.

Thus, in the sectional plane VI-VI, the light rays 26 and 27 emerge from the cylindrical lens 7 in a predefined angular sector of site, centered substantially on the direction perpendicular to the bar 16. These rays 26 and 27 define a web elementary luminous. In other words, the cylindrical lens 7 has a collimating function.

A deflector 28, for example consisting of a metal blade, is positioned on the surface 122 defined by the large base 22 of the trapezium. The deflector 28 has a thickness that is fine with respect to the dimensions of the lens 7 so that the useful light rays are not interrupted, for example by 0.5 mm, a length substantially equal to that of the cylindrical lens, ie 200 mm, and a width of 20mm. The longitudinal sides 39 of the deflector are parallel to the generator. The transverse sides 38 of the deflector are oriented around the generatrix direction in the direction of transmission of the light rays 26 at the outlet of the cylindrical lens 7. Thus, the deflector 28 does not interrupt the light rays 26 and 27 because it is parallel to the direction perpendicular to the bar 16, and therefore to the main direction of the elementary light sheet coming from the projector 6.

The guide curve has an axis of symmetry 100 perpendicular to the bar 16, so that the cylindrical lens 7 has a first plane of symmetry 1000 generated by two generators. That is to say that the guide curve 10 has substantially an isosceles trapezoid shape. The cylindrical lens 7 also has a second plane of symmetry, which is the sectional plane IV-IV, cutting the cylindrical lens at half length L / 2. Indeed, the two end faces 20 are perpendicular to the generatrix of the cylinder.

The Figure 7 represents a section along plane VI-VI of cylindrical optics identical to Figure 4 . On this Figure 7 are shown in projection on section VI-VI the light rays 31 from the central diode 15 of the diode array 16 in the azimuth angle direction 45 ° through the optics. The light rays 31 cause a parasitic light intensity at the angle of elevation s = -10 ° greater than 3% of the luminous intensity at the maximum intensity of the elementary luminous sheet, that is to say at the angle of elevation s = 0 °. The elevation angle s is defined relative to the horizontal 5 corresponding to the elevation angle s = 0 °. A stray light is defined by the light outside the predefined angular sector of the elementary light-film whose luminous intensity is greater than 3% of the maximum light intensity in the predefined angular sector of the site.

The deflector 28 is opaque: the light rays 31 which meet it do not pass through it. They are artificially represented on the figure 7 to understand the origin of parasitic light intensity which is overcome by placing the deflector 28 on the cylindrical lens 7.

According to a preferred embodiment, the deflector 28 consists of a reflective metal plate to reflect the light rays 31 upwards (not shown). The advantage of a deflector which reflects the parasitic light rays 31 is to limit the absorption of the light energy parasitic rays, and therefore the heating of the deflector 28. The effects of the presence of the deflector 28 will now be illustrated.

Indeed, with reference to the Figure 8 a curve 29 represents a measurement of the luminous intensity I resulting from a headlamp 6 at the angle of elevation s = -10 °, as a function of the azimuth angle Φ, for a headlamp 6 not equipped with A deflector 28. This projector 6 comprises a cylindrical lens 7 and a bar of diodes 16 as illustrated in the examples with reference to FIGS. Figures 3 and 4 . The horizontal axis is graduated in steps of 20 °.

A second curve 30 represents a measurement of the luminous intensity I resulting from an identical projector 6, at the elevation angle s = -10 °, as a function of the azimuth angle Φ, with the difference, with respect to at the first curve 29, that the projector is this time equipped with a deflector 28 as shown with reference to Figures 6 and 7 ..This deflector 28 is located 3mm from the axis of symmetry 100.

The two light intensity curves 29 and 30 were measured for the projector 6 in operation, over an azimuth angle range of 180 °, the range being centered on the azimuthal angle θ = 0 ° defined in the plane of section. IV-IV. The luminous intensity I has been represented without unit, so as to show the relative variations of intensity between the projector 6 provided with the deflector 28, ie the intensity represented by the curve 30, and the projector 6 without the deflector 28, ie the intensity represented by the curve 29. The curve 29 has two intensity peaks 32 and 33 on either side of the azimuth angle Φ = 0, whose maximum value is 6 times greater than the value of the luminous intensity at the azimuth angle Φ = 0. The two intensity peaks 32 and 33 are respectively centered on -35 ° and 35 °. In contrast, the light intensity 34 and 35 on the curve 30 about the same respective azimuth angles, i.e. -35 ° and 35 °, is equal to the light intensity I at the angle of azimuth Φ = 0.

The comparison of these curves 29 and 30 thus shows that the deflector 28 makes it possible to eliminate the parasitic light at the angle of elevation s = -10 °.

With reference to the Figure 9 the iso intensity curves of the light coming from the projector 6 not provided with the deflector 28 are represented on a screen 35. In the horizontal direction, a position on the screen 35 is identified by the azimuth angle Φ and in the direction vertically, a position on the screen is identified by the elevation angle s. The elevation angle s = 0 corresponds to the horizontal plane and the azimuth angle Φ = 0 corresponds to the section plane IV-IV. Curve 29 of the Figure 8 is a representation of the light intensity along line 40 of the Figure 9 .

The light is mainly directed towards an angular sector of site less than 10 ° and centered on the angle of elevation s = 0, as shown by the curves 3 in bold delimiting the angular sector of predefined site of the elementary luminous sheet.

Stray light is also emitted out of this angular sector, as shown by the dashed curves 36 and 37.

With reference to the Figure 10 , the iso intensity curves of the light from the projector 6 provided with a deflector 28 are shown. As for the Figure 9 , The light is mainly directed towards an angular sector of site less than 10 ° and centered on the angle of elevation s = 0 °, as shown by the curves 3 in bold delimiting the angular sector of predefined site of the elementary luminous sheet. Curve 30 of the Figure 8 is a representation of the light intensity along line 41 of the Figure 10 .

Parasitic light is also emitted outside this predefined angular sector of the site, for positive elevation angles greater than 10 °, as shown by the curve 36 in dashed lines. No parasitic light is to be deplored for negative elevation angles of less than 10 °. Thus, the deflector 28 positioned above the axis of symmetry 100 makes it possible to eliminate the parasitic rays 31 causes of the luminous intensity of the parasitic light represented by the curve 37. The position of the deflectors represented on FIG. Figure 7 is not imperative.

The relative position of the deflector 28 with respect to the central plane of the elementary luminous sheet can be determined by means of experimental luminance measurements for angles of elevation less than and equal to -10 °, by placing the deflector in different positions. In order to be able to interrupt the parasitic light rays 31 directed from an upper side 11 of the cylindrical lens 7 downwards, the deflector 28 is always positioned below the maximum of the side 11.

For example, according to the illustrative embodiment of the Figure 7 the deflector 28, which is positioned above the axis of symmetry 100 as previously explained, is placed below the maximum of the upper convex outer surface 12 of the cylindrical lens 7. The deflector 28 is also placed above the second convex interface 25. The deflector 28 is placed about 2/3 of the height of the first convex interface 22 from the top, as shown.

The deflector 28 is oriented so that the metal plate constituting it is substantially parallel to the direction of the light rays of the center of the elementary light sheet, so as not to obstruct the substantially horizontal useful light rays, but only parasitic light rays oriented in a negative site angle. The deflector may, however, be slightly inclined with respect to the central direction of the ply, preferably at an angle less than the angular aperture of the main ply containing 50% of the intensity.

The tags described above can be made with many types of light sources, including LEDs, tubes, fluorescents, discharge lamps and others. The light can be of different colors, with or without blinking, depending on the desired illumination characteristics.

In another embodiment, the linear light source is not exactly centered on the plane of symmetry 1000. Thus, the principal direction of the elementary luminous sheet is not exactly horizontal.

In another embodiment, the lens does not have a first plane of symmetry. In another embodiment, the lens has no second plane of symmetry.

The linear light source is preferably placed on a line of focus of the cylindrical lens. The line of focus is defined by a line on which light rays from infinity converge after passing through the cylindrical lens in the direction of propagation contrary to that previously described for the emission of light from the projectors.

The cylindrical lens can be manufactured in many materials, for example glass, polycarbonate, transparent flexible resin, for example flexible resin comprising polyurethane compounds, for example a series resin VT3402.

Beacon 1 of the Figure 1 can be performed with any number of projectors greater than 2. In another embodiment, the projectors can be stacked vertically, so that the principal directions of the azimuthal angular sectors of the emitted light layers are shifted from one another to the other. an angle sufficient so that the assembly formed by the light plies emitted by each of the lights of the beacon is emitted in a total azimuthal angle of 360 °.

The cylindrical lens can have different shapes.

In another embodiment, the guide curve is substantially quadrilateral in shape. In another embodiment, the steering curve is elliptical. In another embodiment, the steering curve is a circle.

In another embodiment, the cylindrical lens consists of an assembly of cylindrical lenses coupled together.

Although the invention has been described in connection with several particular embodiments, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

The use of the verb "to include", "to understand" or "to include" and its conjugated forms does not exclude the presence of other elements or steps other than those set out in a claim. The use of the indefinite article "a" or "an" for an element or a step does not exclude, unless otherwise stated, the presence of a plurality of such elements or steps.

In the claims, any reference sign in parentheses can not be interpreted as a limitation of the claim.

Claims (9)

A light projector (6) for producing a directional light sheet (3) for the indication of obstacles in elevation, the projector comprising: an elongate cylindrical lens (7) whose cylindrical shape is defined by a horizontal generatrix direction (9) and a guide curve (10), the cylindrical lens (7) having a horizontal plane of symmetry (100, 1000), a linear light source (14, 15) parallel to the generatrix direction (9), extending over all or part of the length (L) of the cylindrical lens (7) to emit a luminous flux towards the cylindrical lens ( 7) the cylindrical lens (7) being able to generate a main light ply (26, 27) by concentrating the luminous flux in a predefined angular sector of area around the horizontal generative direction (9) towards the space on the opposite side of the cylindrical lens with respect to the light source, and being capable of projecting the luminous flux in a predefined azimuth angular sector around the vertical direction, characterized in that it further comprises a deflector (28) comprising a metal blade, positioned in the space on the opposite side of the light source (15) from the cylindrical lens, the baffle having a rectangular plate shape, the longitudinal sides of the deflector being parallel to the generatrix direction (9), the transverse sides of the deflector being oriented around the generating direction at an angle of elevation (s) contained in the angular sector of the predefined site (s) of the main light ply (26, 27), deflector being further positioned above the horizontal plane of symmetry of the cylindrical lens and below the upper surface of the cylindrical lens, so as to interrupt light rays (31) coming from the light source (15) and oriented outside the angular sector of the site (s) of the main light layer (26, 27). Light projector according to claim 1, wherein the guide curve (10) has a substantially trapezoidal overall shape, the small base (21) of the trapezium being oriented towards the light source (14, 15) and the large base (22) of the trapezium being oriented in the direction of the light layer (26, 27),
the guide curve (10) having a recess (23) defining a groove parallel to the generatrix (9) on the small base (21) of the trapezium, the bottom wall of the groove being a convex surface (24),
the other two sides (11) of the trapezium defining two inclined convex outer surfaces (12) of the cylindrical lens (7), the two outer surfaces being able to reflect the light rays so as to fold the light rays (27) into the sector angular location of the main light sheet (26, 27). Light projector according to claim 2, wherein the large base (22) of the trapezium is about 56 mm, the small base (21) of 20 mm and the length (L) of the cylindrical lens (7) of about 200 mm. The illuminator of claim 3, wherein the linear source (14, 15) is in the horizontal plane of symmetry (100, 1000). Light projector according to any one of claims 1 to 4, the angular sector of site (s) being defined as the angular sector in which the light intensity is greater than 50% of the light intensity at the center of the light sheet ( 26, 27), the azimuthal angular sector (Φ) being defined as the angular sector in which the luminous intensity is greater than 50% in the center of the light sheet,
the angular sector of site being less than 10 °, preferably less than 3 °. An illuminator according to any one of claims 1 to 5, wherein the ratio of the length of the deflector (28) to the width of the deflector (39) is about 2 to 20 and the ratio of the length of the deflector to the The thickness of the deflector (38) is about 100 to 1000. Light projector according to any one of claims 1 to 6, wherein the deflector (28) is distant from a horizontal plane (100, 1000) containing the light source (14, 15), a distance of less than 25% of the largest vertical dimension (22) of the cylindrical lens. An illuminator according to any one of claims 1 to 7, wherein the length of the deflector (28) is substantially equal to the length of the lens. Light beacon (1) comprising a support and several projectors (6) according to any one of claims 1 to 8 fixed on the support, the projectors (6) being oriented in distinct directions (Φ) about a vertical axis ( z) so that the azimuthal angular sectors (Φ) of the projectors cover 360 ° around the vertical axis (z).

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