Lenses, including work lights with such lenses, and vehicles

Abstract

The present invention provides a lens (15). The input surface (20) of the lens (15) includes: an upper portion (22) configured to deflect light rays such that the light rays are substantially parallel to a horizontal mid-plane (P2); and a lower portion (23) configured to reduce the vertical angle (α) of the light beam along the vertical axis (Z). The output surface (30) of the lens (15) includes: a central vertical portion (31) substantially planar and orthogonal to the optical axis (16); and lateral portions (32) located on both sides of the central vertical portion (31), the lateral portions (32) being configured to deflect each light ray in the direction of the vertical mid-plane (P1) according to the deflection amplitude, wherein the deflection amplitude is greater as the incident point of the light ray on the lateral portions (32) is closer to the vertical mid-plane (P1).

Description

Technical Field

[0001] This invention relates to a lens for placement in the path of light emitted by a light source. The invention also relates to a work light comprising a plurality of light sources and such a lens arranged opposite at least one of these light sources. Furthermore, the invention relates to a vehicle, particularly a heavy vehicle such as a truck, comprising at least one such work light. Background Technology

[0002] Some vehicles are equipped with work lights, which are housings containing light sources suitable for illuminating the desired area, such as spotlights. More specifically, this involves heavy vehicles such as trucks, and particularly vehicles including those with rear-mounted containers that are to be loaded with / unloaded from goods. Specifically, these vehicles can include transport vehicles, whether refrigerated or not, equipped with lifting doors, garbage trucks, etc. To ensure these loading / unloading operations are performed correctly without any particular difficulty and with complete safety, it is preferable to illuminate the work area, especially since these vehicles are often used in the early morning when it is still dark. Work lights can also be equipped on construction machinery.

[0003] Traditionally, work lights consist of a housing mounted on a vehicle via a support. The support can be designed to allow the housing to tilt in order to properly guide the beam of light for satisfactory illumination of the work area.

[0004] Due to its function, a work light should produce illumination strong enough to light the desired area. Therefore, despite the aforementioned design allowing for tilting, specifically towards the ground, work lights often remain extremely dazzling to people moving around the vehicle. This is very unpleasant and may even pose some risks. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned disadvantages.

[0006] Therefore, according to a first aspect, the present invention relates to a lens having an optical axis extending along a so-called longitudinal axis (X), the lens being positioned in the path of light emitted by a light source such that the optical axis of the lens is parallel to the emission axis of the light source. The lens has an input surface and an output surface along the direction of light propagation, and the lens has an overall arched shape along the direction of the output surface. The lens defines a so-called vertical axis (Z) and a so-called horizontal axis (Y), and the lens further has a so-called first vertical mid-plane extending in the XZ plane and a so-called second horizontal mid-plane extending in the YZ plane.

[0007] According to the general definition of the present invention, the input surface includes:

[0008] The upper portion located above the horizontal mid-plane is configured to deflect light rays at least along the vertical axis, such that the light rays are substantially parallel to the horizontal mid-plane.

[0009] And a lower portion located below the horizontal midplane, which is configured to reduce the vertical angle of the beam along the vertical axis between the horizontal midplane and the lower limit.

[0010] In addition, the output surface includes:

[0011] The central vertical section is essentially planar and orthogonal to the optical axis;

[0012] The lateral portions, located on either side of the central vertical portion, are configured such that each ray of light is deflected in the direction of the vertical midplane according to the deflection magnitude. The closer the incident point of the ray on the lateral portions is to the vertical midplane, the greater the deflection magnitude.

[0013] Therefore, due to the specific geometry of the input surface, the lens according to the invention allows light received in the upper portion of the lens to be collimated, thus parallel to the optical axis. This results in an unlit upper region that is typically at eye level for the observer, and thus greatly limits glare. Furthermore, the lower portion of the input surface allows for the collection of as much light emitted by the light source as possible and its concentration toward the directly useful area, that is, toward the work area to be illuminated in work lighting applications. Additionally, the specific geometry of the lens's output surface, according to a non-uniform distribution, such as a Gaussian distribution, transforms the distribution of luminous intensity in the illuminated area, preferably along both the vertical and horizontal axes. Such a distribution allows for maximum luminous intensity near the optical axis while simultaneously transitioning to less illuminated areas, thereby providing the observer with good illumination efficiency and enhanced visual comfort.

[0014] Therefore, the lens according to the invention allows for the combination of the effectiveness of the working light—by collecting a very large amount of light emitted by the light source and concentrating the collected light mostly toward the main area—and the visual comfort of people near the working light—by limiting glare by creating unlit areas and by distributing the luminous intensity around the brightest main area without any abrupt interruptions.

[0015] Another advantage of this invention is that the anti-glare effect is achieved through the lens design, and therefore does not involve the application of obstacles that block the light. This simplifies installation, reduces the risk of damage to the work light, and makes the distribution of luminous intensity within the illuminated area more satisfactory.

[0016] The input surface can have a concave profile in the XZ plane, which forms a boss pointing in the opposite direction to the output surface. For example, the boss is located near the optical axis.

[0017] According to a possible implementation, the input surface has a "saddle" shape (i.e., shaped like a hyperbolic parabola), with a concave profile in the XY plane and a convex profile in the XZ plane, the convex profile forming a boss pointing in the opposite direction to the output surface.

[0018] Depending on the application, the vertical midplane can be the plane of symmetry of the lens's input surface.

[0019] Furthermore, the upper and / or lower portions of the input surface can be configured to reduce the horizontal angle of the light beam along the transverse axis. In this way, most of the light emitted by the light source can be collected and concentrated, that is, guided toward the desired area. According to possible implementations, the light beam is symmetrically reduced about the vertical midplane, that is, reduced equally on each side of the plane.

[0020] Each lateral portion of the output surface can be curved about the vertical axis, causing the concave shape to point towards the input surface, and the radius of curvature of this concave shape in the XY plane increases with distance from the vertical mid-plane. In other words, the farther away from the vertical mid-plane, the more planar the shape becomes. Therefore, each lateral portion is approximately cylindrical in shape, but with variable curvature.

[0021] Depending on the application, the vertical midplane and / or the horizontal midplane can be the plane of symmetry of the lens's output surface.

[0022] According to a second aspect, the present invention relates to a work lamp comprising a housing, a plurality of light sources disposed within the housing, and a lens as described above, the lens being arranged opposite to at least one of the light sources and located on the path of light emitted by said light source, and the lens being arranged such that the optical axis of the lens is parallel to the emission axis of said light source.

[0023] According to a third aspect, the present invention relates to a vehicle, particularly a heavy vehicle such as a truck, comprising at least one work light as described above. The work light is mounted on the vehicle by means of a support member, which is preferably configured to allow the work light to tilt about a horizontal axis. Attached Figure Description

[0024] Possible embodiments of the invention, as non-limiting examples, will now be described with reference to the accompanying drawings:

[0025] Figure 1 This is an exploded perspective view of a working lamp including multiple lenses according to an embodiment of the present invention;

[0026] Figure 2 It is a three-dimensional view of the light source and the lens placed in front of the light source;

[0027] Figure 3 It is based on another perspective, similar to Figure 2 The view;

[0028] Figure 4 This is a side view of the lens;

[0029] Figure 5 This is a schematic cross-sectional view of a lens in the vertical midplane;

[0030] Figure 6 This is a top view of the lens;

[0031] Figure 7 This is a schematic plan view of the input surface of the lens;

[0032] Figure 8 This is a schematic planar view of the lens's output surface;

[0033] Figure 9 The path of a light ray emitted by a light source and passing completely through the lens according to the invention is schematically shown in the vertical midplane;

[0034] Figure 10 The path of light emitted by the light source and passing completely through the lens according to the invention is schematically shown in a horizontal plane;

[0035] Figure 11 The diagram schematically illustrates the distribution of luminous intensity obtained after a beam of light emitted by a light source has completely passed through a lens. Detailed Implementation

[0036] Figure 1 The work light 1 is shown in an exploded perspective view.

[0037] The work light 1 includes a housing 2, which is mounted on a support 3, which is in turn mounted on a vehicle V, particularly a heavy vehicle such as a truck. For example, the support 3 can be fastened to the vehicle V, and the housing 2 can be pivotally mounted on the support 3 about an axis 5. The pivot axis 5 can be horizontal and laterally oriented, such that the beam of light produced by the work light 1 can be angled towards the ground.

[0038] The shell may have a bottom wall 4 and an open surface 6 opposite to the bottom wall 4.

[0039] The work lamp 1 includes multiple light sources 10, which are typically composed of LEDs (light-emitting diodes). For example, the work lamp 1 may have five to ten light sources. Each light source 10 may include a base 11 and a cover 12, and has a main emission axis 13. The light sources 10 are disposed within a housing 2, for example, mounted on a plate-like member 7, which is in turn secured within the housing 2. The light sources 10 may be mounted such that their emission axes 13 are parallel to each other and, for example, orthogonal to an open surface 6 of the housing 2.

[0040] Lens 15 is arranged opposite to, and preferably to, each of the light sources 10, the light emitted by said light source 10 and located in the path of the light emitted by said light source 10. Each lens 15 has an optical axis 16, and each lens 15 is preferably arranged such that the optical axis 16 is parallel to, or even coincides with, the emission axis 13 of the corresponding light source. The light source 10 is placed at the focal point of the corresponding lens 15.

[0041] The lens 15 can be integrated with the transparent wall 8, which is typically made in one piece by molding plastic material.

[0042] In addition, the glass 9 can be configured to be opposite to the transparent wall 8 to close the open surface 6 of the housing 2.

[0043] The work light 1 forms a powerful lighting device, also known as a work illuminator or work spotlight, which allows the area where the operator is to intervene to facilitate and ensure the operator's work. The vehicle V may be equipped with multiple work lights 1 as needed.

[0044] Lens 15 defines a so-called vertical axis (Z), a so-called horizontal axis (Y), and a so-called longitudinal axis (X) parallel to the optical axis 16. In the illustrated embodiment, the longitudinal axis (X) is orthogonal to the bottom wall 4 of the housing 2. The longitudinal axis (X) is horizontal—if the work lamp 1 is mounted vertically, that is, if the work lamp 1 has not yet pivoted about axis 5—and the horizontal axis (Y) is also horizontal, and as... Figure 1 As shown, the vertical axis (Z), the horizontal axis (Y), and the longitudinal axis (X) are orthogonal to each other. Therefore, axis (Z) is arranged vertically. However, other orientations can be considered.

[0045] Lens 15 has a so-called first vertical midplane P1 extending in the XZ plane and a so-called second horizontal midplane P2 extending in the YZ plane.

[0046] Lens 15 has an input surface 20 and an output surface 30 along the direction of light propagation. Figure 2 The input surface 20 is shown in more detail below. Figure 3 The output surface 30 is shown in more detail below.

[0047] Lens 15 has an overall arched shape along the direction of the output surface 30. In other words, lens 15 has an overall arc-shaped shape similar to a cup, but the shape of lens 15 is not hemispherical. The perimeter of lens 15 is approximately circular when viewed along the optical axis 16, as... Figure 6 and Figure 7 As shown in the diagram, the perimeter includes an upper edge 17 and a lower edge 18, each forming a generally arcuate strip on either side of the horizontal midplane P2; furthermore, a planar surface 19 is formed near the horizontal midplane P2, pointing in the opposite direction to the output surface 30. The planar surface 19 allows for the avoidance of parasitic total reflection of light in the lens 15.

[0048] As in Figure 2 , Figure 4 and Figure 5 As shown very specifically in the diagram, the input surface 20 can have a "saddle" shape, that is, the input surface 20 can:

[0049] It has a concave profile in the XY plane, such as Figure 5 It is specifically shown in the text;

[0050] And having a convex profile in the XZ plane, the convex profile forming a boss 21 pointing in the opposite direction to the output surface 30, such as Figure 4 As specifically shown, the boss 21 may be located near the optical axis 16.

[0051] In the application shown, the vertical midplane P1 is the plane of symmetry of the input surface 20 of lens 15. However, for other applications where asymmetrical illumination is desired, configurations that are asymmetrical about plane P1 can be considered.

[0052] Conversely, the horizontal plane P2 is not the plane of symmetry of the input plane 20.

[0053] In fact, in order to limit the glare generated by the light source 10, the input surface 20 includes an upper portion 22 located above the horizontal midplane P2, which is configured to deflect light received in the upper portion 22 at least along the vertical axis (Z) so that the light rays are substantially parallel to the horizontal midplane P2 after passing through the input surface 20.

[0054] Furthermore, the beam emitted downwards by the light source 10 produces significantly less glare for the observer. This is due to the different function—and therefore geometry—of the lower portion 23 of the input surface 20 of the lens 15. More specifically, the lower portion 23, located below the horizontal midplane P2, is configured to reduce the vertical angle α of the beam along the vertical axis (Z) between the horizontal midplane (P2) and the lower limit. In this way, the entire beam received by the lower portion 23 of the input surface 20 of the lens 15 is collected and directed toward the useful area, i.e., the area to be illuminated, rather than simply being sent toward a less important area. Therefore, ultimately, a higher luminous intensity is obtained in the area to be illuminated.

[0055] Specifically, the upper portion 22 of the input surface 20 can extend between the horizontal mid-plane P2 and the upper edge 17, while the lower portion 23 can extend between the horizontal mid-plane P2 and the lower edge 18.

[0056] According to possible implementation methods, and as Figure 5 As shown, in the XZ plane, at least near the vertical mid-plane P1, and at a certain distance from the boss, the upper portion 22 of the input surface 20 is substantially planar or has a large radius of curvature. Furthermore, the lower portion 23 is substantially planar or has a large radius of curvature, but the lower portion 23 is not symmetrical about the upper portion 22 about the optical axis 16. Figure 5 The upper portion 22 is shown as a symmetrical portion S about the optical axis 16 by dashed lines. More specifically, the lower portion 23 can be shifted along the optical axis 16 with respect to this symmetrical portion as it moves away from the output surface 30, and / or the acute angle formed between the lower portion 23 and the optical axis 16 can be greater than the acute angle formed between the symmetrical portion S and the optical axis 16.

[0057] Regarding the level of the upper portion 22 and / or the lower portion 23, the input surface 20 can be further configured to reduce the horizontal angle β of the beam along the transverse axis (Y), i.e., the horizontal angle β observed in the XY plane.

[0058] Regarding output surface 30, its position... Figure 3 and Figure 8 More specifically, the output surface 30 includes:

[0059] The central vertical portion 31 is substantially planar and orthogonal to the optical axis 1. The width of the central portion (along the Y-axis) can, for example, be between 10% and 20% of the diameter of the lens 15;

[0060] Lateral portions 32 are located on both sides of the central vertical portion 31. These lateral portions 32 are configured to cause each ray of light to deflect in the direction of the vertical midplane P1 according to the deflection amplitude. The closer the incident point of the ray on the lateral portions 32 is to the vertical midplane P1, the greater the deflection amplitude.

[0061] Therefore, each lateral portion 32 of the output surface 30 can have a shape that bends around the vertical axis, so that the concave shape points towards the input surface 20, and the radius of curvature of the concave shape in the XY plane increases as it moves away from the vertical mid-plane P1.

[0062] In the application shown, both the vertical midplane P1 and the horizontal midplane P2 are planes of symmetry of the output surface 30. Nevertheless, other configurations can be considered.

[0063] By maintaining essentially the same illumination area as the illumination area obtained after the beam passes through the input surface 20, the output surface 30 allows for a non-uniform distribution of luminous intensity, wherein the maximum intensity is near the optical axis 16 of the lens 15, and this intensity gradually decreases away from the optical axis 16 without any abrupt change.

[0064] Optionally, each lateral portion 32 of the input surface 30 can be further configured to change the vertical angle α of the light beam about the optical axis along the vertical axis (Z) between the horizontal mid-plane (P2) and the lower limit. Thus, the light beam is redirected as it passes through the interior of the lens 15 and reaches the surrounding environment after reaching the output surface 30.

[0065] This change can include increasing the vertical angle α. Such an arrangement allows for an increase in the size of the area illuminated at the exit of the lens 15, based on the spatial concentration performed by the input surface 20. Typical applications include obtaining sufficient illumination on the ground when the work lamp 1 has the lens 16.

[0066] Alternatively, one could consider reducing the vertical angle α of the beam to concentrate the light more towards a smaller area.

[0067] Regarding the horizontal aspect of the lateral portion 32, the output surface 30 can be further configured to reduce the horizontal angle β of the beam along the transverse axis (Y), i.e., the horizontal angle β observed in the XY plane.

[0068] Now refer to Figure 9 and Figure 10 It shows the incident beam 40 emitted by the light source 10 and the deflection experienced by the incident beam 40 as it passes through the input surface 20 of the lens 15 and then through the output surface 30 to form the transmitted beam 42.

[0069] exist Figure 9In the XZ plane shown, the incident beam 40 received by the upper portion 22 of the input surface 20 is redirected to be parallel to the optical axis 16 in the transmitted beam 42 of the exit lens 15. Furthermore, the incident beam 40 received by the lower portion 23 of the input surface 20 is redirected toward the optical axis 16 while still remaining downwardly inclined in the transmitted beam 42.

[0070] Therefore, lens 15 is configured to reduce the vertical angle α of the light beam along the vertical axis (Z). Specifically, below the horizontal midplane P2:

[0071] The first lower limit 41 of the incident beam 40 is tilted relative to the optical axis at an angle α0;

[0072] The second lower limit 43 of the beam obtained by passing through the input surface 20 and propagating within the lens 15 is tilted at an angle α1 relative to the optical axis;

[0073] Furthermore, the third lower limit 44 of the transmitted beam 42 after passing through the output surface is tilted relative to the optical axis at an angle α2.

[0074] Angle α1 is less than α0, and angle α2 is less than α0.

[0075] For example, for an angle α0 close to 40°, the angle α2 can be in the range of 35% to 50% of α0, such as close to 15° to 20°.

[0076] In the illustrated embodiment, the light beam converges (i.e., α1 < α0) after passing through the input surface 20 of the lens 15, and then diverges (i.e., α2 > α1) as it passes through the output surface 30 of the lens 15. However, this embodiment is not limiting, and it is also possible to make α2 < α1.

[0077] For example, for an angle α0 close to 40°, the angle α1 can be between 15% and 40% of α0, and also between 20% and 35% of α0, or even between 20% and 30% of α0, for example, close to 10° to 15°.

[0078] In such Figure 10 In the XY plane shown, the incident beam 40 received by lens 15 is redirected such that its tilt relative to the optical axis 16 is reduced. In other words, the horizontal angle β of the beam is reduced. In the illustrated embodiment, when P1 is the plane of symmetry of lens 15, the horizontal angle β of the beam decreases symmetrically on both sides of P1.

[0079] The input surface 20 can produce a first decrease in the horizontal angle β of the beam from β0 to β1. The input surface 20 can be designed to redirect all incident rays received therefrom with the same magnitude.

[0080] The output surface 30 may produce a change in the horizontal angle of the beam from β1 to β2, or it may not produce such a change. Instead, the output surface 30 is designed such that the closer the point of incidence of the light relative to the output surface 30 is to the optical axis 16, the greater the directional change of the light towards the optical axis (in the lateral portion 32 of the output surface 30).

[0081] For example, for an angle β0 close to 120°, the angle β2 can be in the range of 60% to 70% of β0, such as close to 70° to 80°.

[0082] Figure 11 The light distribution 50 obtained due to lens 15 is shown.

[0083] On the one hand, an unlit area 51 is formed due to the upper portion 21 of the input surface 20, which is advantageously located at the level of the observer's eyes, thereby producing the desired anti-glare effect.

[0084] On the other hand, a localized illumination area 52 is obtained, which is horizontally defined by the outermost light of the transmitted beam 42 between angles -β2 / 2 and +β2 / 2, and vertically defined in the lower portion by the third lower limit 44 of the transmitted beam 42 at an angle α2.

[0085] Because the amplitude of light deflection through lens 15 is variable, the illumination area 52 has a non-uniform light distribution along both axes, for example, a Gaussian distribution, wherein:

[0086] The central portion 53 near the optical axis 16 has the maximum luminous intensity;

[0087] The generally annular portions 54a, 54b, 54c, 54d… exhibit reduced luminescence intensity, although in Figure 11 The boundary between 54a and 54d is shown in the figure, but it can be specified that the luminous intensity is preferably varied in a continuous rather than staggered manner.

[0088] The lens 15 according to the invention allows for the collection of a very large amount of light emitted by the light source 10, i.e., a large portion of the emitted light beam. Furthermore, the lens 15 allows the received incident light beam 40 to be concentrated and directed toward the area to be illuminated by reducing the vertical and horizontal angles of the light beam. Thus, the overall luminous intensity of the area to be illuminated is very high, and the illumination produced in this way is particularly satisfactory.

[0089] The very specific concentration of light toward the central portion 53 allows for a portion with strong luminosity, which is the opposite of a uniform distribution of light, which results in too low an intensity and is practically unusable, especially when applied to the work lamp 1.

[0090] Furthermore, the absence of abrupt transitions between areas of varying luminosity, particularly between very dark and very bright areas, allows for a wider illumination area and is simultaneously more visually comfortable for the observer.

[0091] It goes without saying that the present invention is not limited to the embodiments described above as examples, but includes all technical equivalents and variations and combinations thereof of the described apparatus.

[0092] In particular, it should be noted that the invention is described with the axis (Z) in a vertical direction, which can be positioned in different ways, so that the unlit area 51 is no longer above the horizontal plane.

Claims

1. A lens (15) having an optical axis (16) extending along a longitudinal axis (X), the lens (15) being positioned in the path of a light ray emitted by a light source (10) such that the optical axis (16) of the lens (15) is parallel to the emission axis (13) of the light source (10), the lens (15) having an input surface (20) and an output surface (30) along the propagation direction of the light ray, and the lens (15) having an overall arched shape along the direction of the output surface (30), the lens (15) defining a vertical axis (Z) and a horizontal axis (Y), and the vertical axis (Z), the horizontal axis (Y) and the longitudinal axis (X) being orthogonal to each other, and the lens (15) further having a first vertical midplane (P1) extending in the XZ plane and a second horizontal midplane (P2) extending in the YZ plane, characterized in that, The input surface (20) includes: The upper portion (22), positioned above the second horizontal midplane (P2), is configured such that the light ray deflects at least along the vertical axis (Z), such that the light ray is substantially parallel to the second horizontal midplane (P2); and The lower portion (23) is positioned below the second horizontal mid-plane (P2) and is configured such that the vertical angle α of the beam along the vertical axis (Z) between the second horizontal mid-plane (P2) and the lower limit of the beam from the first lower limit (41) of the incident beam (40) to the second lower limit (43) of the beam inside the lens (15) and then to the third lower limit (44) of the transmitted beam (42) is reduced. The first lower limit (41) is tilted relative to the optical axis (16) at an angle α0, the second lower limit (43) is tilted relative to the optical axis (16) at an angle α1, and the third lower limit (44) is tilted relative to the optical axis (16) at an angle α2. The output surface (30) includes: The central vertical portion (31) is substantially planar and orthogonal to the optical axis (16); - Lateral portion (32), which is located on both sides of the central vertical portion (31), the lateral portion (32) is configured to cause each ray of light to deflect in the direction of the first vertical midplane (P1) according to the deflection amplitude, the deflection amplitude being greater as the incident point of the ray on the lateral portion (32) is closer to the first vertical midplane (P1).

2. The lens according to claim 1, characterized in that, The input surface (20) has a concave profile in the XZ plane, and the concave profile forms a boss (21) pointing in the opposite direction to the output surface (30).

3. The lens according to claim 2, characterized in that, The boss (21) is located near the optical axis (16).

4. The lens according to claim 2 or 3, characterized in that, In the XZ plane, at least near the first vertical midplane (P1) and at a certain distance from the boss (21): The upper portion (22) of the input surface (20) is substantially planar or has a very large radius of curvature; The lower portion (23) is substantially planar or has a very large radius of curvature, and is symmetrical about the optical axis (16) relative to the upper portion (22): The lower portion (23) shifts along the optical axis (16) as it moves away from the output surface (30); And / or the acute angle formed between the lower portion (23) and the optical axis (16) is larger.

5. The lens according to any one of claims 1 to 3, characterized in that, The input surface (20) has a "saddle" shape, and the input surface (20) has a concave profile in the XY plane and a convex profile in the XZ plane. The convex profile forms a boss (21) pointing in the opposite direction to the output surface (30).

6. The lens according to any one of claims 1 to 3, characterized in that, The first vertical midplane (P1) is the plane of symmetry of the input surface (20) of the lens (15).

7. The lens according to any one of claims 1 to 3, characterized in that, The lower portion (23) of the input surface (20) is configured to reduce the vertical angle α of the beam about the optical axis (16) along the vertical axis (Z), such that the angle α1 between the second lower limit (43) and the optical axis (16) is between 15% and 40% of the angle α0 between the first lower limit (41) and the optical axis (16).

8. The lens according to claim 7, characterized in that, The angle α1 between the second lower limit (43) and the optical axis (16) is between 20% and 35% of the angle α0 between the first lower limit (41) and the optical axis (16).

9. The lens according to any one of claims 1 to 3, characterized in that, The upper portion (22) and / or the lower portion (23) of the input surface (20) are further configured to reduce the horizontal angle β of the beam along the transverse axis (Y).

10. The lens according to any one of claims 1 to 3, characterized in that, Each of the lateral portions (32) of the output surface (30) has a shape that bends about a vertical axis, such that the concave shape points toward the input surface (20), and the radius of curvature of the concave shape in the XY plane increases as it moves away from the first vertical midplane (P1).

11. The lens according to any one of claims 1 to 3, characterized in that, Each of the lateral portions (32) of the input surface (20) is further configured to change the vertical angle α of the beam about the optical axis (16) along the vertical axis (Z) between the second horizontal midplane (P2) and the second lower limit (43) and the third lower limit (44).

12. The lens according to any one of claims 1 to 3, characterized in that, The first vertical midplane (P1) is the plane of symmetry of the output surface (30) of the lens (15), and / or the second horizontal midplane (P2) is the plane of symmetry of the output surface (30) of the lens (15).

13. A work lamp (1), the work lamp (1) comprising a housing (2) and a plurality of light sources (10) disposed in the housing, characterized in that, The working lamp (1) includes a lens (15) according to any of the preceding claims, the lens (15) being positioned opposite to at least one of the light sources (10), located on the path of the light emitted by the light source (10), and such that the optical axis (16) of the lens (15) is parallel to the emission axis (13) of the light source (10).

14. A vehicle (V), characterized in that, The vehicle (V) includes at least one work light (1) according to claim 13, the work light (1) being mounted on the vehicle (V) by means of a support (3).

15. The vehicle (V) according to claim 14, characterized in that, The vehicle in question is a heavy vehicle.

16. The vehicle (V) according to claim 14, characterized in that, The vehicle in question is a truck.

17. The vehicle (V) according to claim 14, characterized in that, The support (3) is configured to allow the working light (1) to tilt about the horizontal axis (5).

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