Light-emitting device for vehicle comprising exit outer lens and intermediate screen
By introducing an intermediate screen with a non-constant thickness and a decoupled undulation structure in the light emitting device, the problem of the decoupled undulation structure interfering with the light beam in the prior art is solved, ensuring the execution of optical functions and feature display.
Patent Information
- Application Number
- CN202380037756.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-06
- Filing Date
- 2023-05-02
- Publication Date
- 2024-12-13
AI Technical Summary
The curved shape of the decoupled undulating structure in the existing light emitting device interferes with the light beam of the light emitting module and affects the execution of optical functions.
The intermediate screen is introduced in the light emitting device, which has an inconstant thickness, and a decoupled undulation structure is arranged thereon so that the primary light of the light beam passes in the same or parallel direction, thereby avoiding the decoupled undulation structure on the light beam interference.
Through the design of the intermediate screen, the direction of the light beam is ensured that the direction of the light beam is not affected by the decoupled undulation structure and the curved shape of the exit lens, the integrity of the optical function is maintained, and the characteristics of the light emitting device can be displayed both day and night.
Smart Images
Figure CN119137410A_ABST
Abstract
Description
[0001] The present invention relates to a lighting device for a vehicle. The present invention is particularly, but not exclusively, applicable to motor vehicles.
[0002] A lighting device known to a person skilled in the art is a headlamp configured to perform an optical function. The optical function is a lighting and / or signaling function. The lighting device comprises:
[0003] - at least one lighting module configured to generate light to form a light beam making it possible to perform said optical function, and
[0004] - Curved exit outer lens.
[0005] The style of the light emitting device is an important aspect, and car manufacturers want to give their light emitting devices features that make them easily recognizable to the end user. In order to ensure that this feature is visible both during the day and at night, the exit outer lens may include a decoupling relief structure for decoupling the light from the light beam. This decoupling relief structure makes it possible to see the features of the light emitting device when it is turned on and when it is turned off. This is particularly useful for light emitting devices with a large external surface area, such as light emitting devices wrapped around fenders, i.e. light emitting devices that extend not only on the front or rear face of the vehicle but also on the side of the vehicle, at the part where the fender is connected to this front or rear face. Thus, the entire surface area extending onto the fender can be illuminated.
[0006] One disadvantage of this prior art is that the curved shape of the exit outer lens with the decoupling relief structure disturbs the light beam from the at least one light emitting module and thus the optical function performed by the light emitting module.
[0007] Against this background, the present invention aims to provide a lighting device allowing to overcome the above-mentioned disadvantages.
[0008] To this end, the present invention proposes a lighting device for a vehicle, the lighting device comprising:
[0009] - at least one light emitting module configured to generate primary light rays forming a light beam,
[0010] - exit outer lens,
[0011] - Decoupled undulating structures,
[0012] Characterized in that the light emitting device further comprises:
[0013] - an intermediate screen comprising said decoupling relief structure, said intermediate screen being arranged between said at least one light emitting module and said exit outer lens and having a first face facing said at least one light emitting module and a second face facing said exit outer lens,
[0014] - the decoupling relief structure is arranged on a first face of the intermediate screen, the intermediate screen having a non-constant thickness, so that the primary rays of the light beam emerge from the second face of the intermediate screen in a direction identical to or parallel to the direction in which they entered through the first face of the intermediate screen.
[0015] Therefore, as will be seen in detail below, the use of an intermediate screen supporting a decoupling relief structure will render the screen neutral by virtue of a non-constant thickness. This can be achieved by modifying one of its faces (the face that does not support the decoupling relief structure) since the intermediate screen is not constrained by a specific style or aerodynamics like the exit outer lens. The face that supports the decoupling relief structure is not modified, which avoids touching the decoupling relief structure itself.
[0016] According to non-limiting embodiments, the lighting device may further include one or more of the following additional features implemented alone or in any technically possible combination.
[0017] According to a non-limiting embodiment, the second face of the intermediate screen comprises a locally different surface orientation.
[0018] According to a non-limiting embodiment, the exit outer lens is a neutral outer lens.
[0019] According to a non-limiting embodiment, said thickness of said intermediate screen varies between 2.1 mm and 3.5 mm.
[0020] According to a non-limiting embodiment, the thickness of the intermediate screen varies gradually.
[0021] According to a non-limiting embodiment, said at least one lighting module comprises at least one primary light source configured to generate said primary light rays.
[0022] According to a non-limiting embodiment, the lighting device further comprises a secondary light source configured to generate secondary light rays arranged such that the secondary light rays enter the intermediate screen and then propagate therein by internal reflection and emerge from the intermediate screen when they encounter the decoupling relief structure.
[0023] According to a non-limiting embodiment, the primary light source(s) and / or the secondary light source(s) are semiconductor light sources.
[0024] According to a non-limiting embodiment, the decoupling relief structure comprises reliefs which are:
[0025] - microdisks, which are obtained by laser shock, also called microlenses, and / or
[0026] - micro cones, and / or
[0027] - microconical prisms, and / or
[0028] - micro prisms, and / or
[0029] - Granulation department.
[0030] In a non-limiting embodiment, micro or microscopic means that the relief has:
[0031] - a depth between 0.05 mm and 0.4 mm, preferably between 0.1 mm and 0.4 mm,
[0032] - a distance between two reliefs of between 0.3 mm and 2 mm, preferably between 0.3 mm and 1.6 mm, preferably between 0.8 mm and 1.25 mm,
[0033] - A width between 0.05 mm and 0.5 mm, preferably between 0.16 mm and 0.3 mm.
[0034] According to a non-limiting embodiment, the at least one lighting module is configured to perform a primary optical function being a lighting function or a signaling function, and the intermediate screen is configured to perform a secondary optical function being a signaling function.
[0035] According to a non-limiting embodiment, the light emitting device is a headlight or a taillight.
[0036] According to a non-limiting embodiment, the lighting device includes a first lighting module and a second lighting module.
[0037] According to a non-limiting embodiment, the first light-emitting module is a lighting module and the second light-emitting module is a lighting module generating a light beam as an alternative or in addition to the light beam generated by the first light-emitting module.
[0038] According to a non-limiting embodiment, the lighting module(s) may be a lighting module generating at least one of the following light beams: a cut-off beam, a high beam or an adaptive beam. An adaptive beam is a beam in which at least one shadow is projected to position it in front of the vehicle or oncoming vehicles so as not to dazzle the driver or its sensors.
[0039] According to a non-limiting embodiment, the first light module is configured to perform a primary optical function, in particular a high beam, and the second light module is configured to perform another primary optical function, in particular a low beam.
[0040] According to a non-limiting embodiment, the exit outer lens has a non-constant thickness so that the primary rays of the light beam are emitted from the outer face of the exit outer lens in the same or parallel direction as they entered through the inner face of the exit outer lens.
[0041] According to a non-limiting embodiment, the inner face of the exit outer lens comprises a locally different surface orientation.
[0042] According to a non-limiting embodiment, said local surface orientation of said inner face of the exit outer lens is a function of the local curvature of the curve of the exit outer lens, in particular of the curve of its outer face.
[0043] According to a non-limiting embodiment, the thickness of the outer lens varies gradually.
[0044] According to a non-limiting embodiment, the thickness of the exit outer lens varies between 0.3 mm and 0.7 mm.
[0045] According to a non-limiting embodiment, the thickness of the exit outer lens varies along a longitudinal axis substantially perpendicular to the vehicle axis.
[0046] According to a non-limiting embodiment, said local surface orientation of said second face of said intermediate screen is a function of the local curvature of the curve of the intermediate screen, in particular of the local curvature of the curve of said first face.
[0047] According to a non-limiting embodiment, the thickness of the intermediate screen varies by less than 0.7 mm.
[0048] According to a non-limiting embodiment, the thickness of the intermediate screen varies along a longitudinal axis substantially perpendicular to the axis of the vehicle.
[0049] According to a non-limiting embodiment, the light emitting device is a light emitting device wrapped around the fender.
[0050] According to a non-limiting embodiment, the thickness of the intermediate screen decreases towards the side intended to be closest to the fender of the motor vehicle, in particular in the case of a lighting device wrapped around the fender.
[0051] According to a non-limiting embodiment, the secondary light source and the intermediate screen are arranged such that the secondary light rays enter through an edge of the intermediate screen separating the first face from the second face.
[0052] According to a non-limiting embodiment, the first face of the intermediate screen comprises a smooth portion and an undulating portion, the smooth portion and the undulating portion forming a decoupled undulating structure.
[0053] According to a non-limiting embodiment, the surface area of the first face occupied by each of the undulating portions is smaller than the surface area occupied by the smooth portions.
[0054] According to a non-limiting embodiment, the smooth portions are separated by undulating portions.
[0055] According to a non-limiting embodiment, the first face comprises alternating undulating portions and smooth portions.
[0056] A vehicle comprising the vehicle lighting device as described above is also proposed.
[0057] A clearer understanding of the present invention and its various applications will be obtained by reading the following description and studying the accompanying drawings:
[0058] [ Figure 1 ] is an exploded schematic outline view of a lighting device for a vehicle according to a non-limiting embodiment of the present invention, the lighting device comprising at least one lighting module, an exit outer lens, a decoupling relief structure, and an intermediate screen,
[0059] [ Figure 2 ] is according to a non-limiting embodiment Figure 1 An exploded perspective view of the light emitting device,
[0060] [ Figure 3 ] is according to a non-limiting embodiment Figure 2 a rear view of the intermediate screen of the light emitting device, the intermediate screen comprising the decoupling relief structure,
[0061] [ Figure 4 ] is according to a non-limiting embodiment Figure 1 and Figure 2 a close-up view of a relief portion of the decoupled relief structure of the light emitting device, the relief portion being a microdisk,
[0062] [ Figure 5 ] is according to a non-limiting example from Figure 1 and Figure 2 a schematic close-up view of the light emitting device looking in front of the exit outer lens, the exit outer lens being arranged in front of the intermediate screen and being neutral,
[0063] [ Figure 6 ] is according to a non-limiting example from Figure 1 and Figure 2 a schematic close-up view from the front of the intermediate screen of the lighting device, the intermediate screen being arranged in front of the at least one lighting module and having a variable thickness,
[0064] [ Figure 7 ] is according to a non-limiting embodiment when the exit outer lens is neutral. Figure 1 and Figure 2 a luminosity distribution diagram of a light beam emitted by the light emitting device,
[0065] [ Figure 8 ] is the photometric distribution diagram of a light beam emitted by a prior art lighting device comprising a neutral exit outer lens but not comprising an intermediate screen according to the invention,
[0066] [ Fig. 9 ] is the photometric distribution diagram of a light beam emitted by a lighting device of the prior art, which comprises a non-neutral exit outer lens and does not comprise an intermediate screen according to the invention.
[0067] Unless otherwise stated, elements that are identical in structure or function and that appear in several figures retain the same reference numerals.
[0068] Now refer to Figures 1 to 7 A lighting device 1 for a vehicle 2 according to the invention is described. In a non-limiting embodiment, the vehicle 2 is a motor vehicle. A motor vehicle refers to any type of motorized vehicle. In the remainder of the description, this embodiment will be considered by way of non-limiting example. In the remainder of the description, the vehicle 2 is therefore also referred to as a motor vehicle 2. Figure 1 The vehicle axis AX is shown in .
[0069] In a non-limiting embodiment, the lighting device 1 is a lighting and signaling device.
[0070] In a non-limiting embodiment, the lighting device 1 is a headlight or a taillight. The lighting device 1 is thus configured to be arranged on the front face or the rear face of the motor vehicle 2. In a non-limiting embodiment, the lighting device 1 is a lighting device wrapped around the fender, i.e., it extends on the front face or the rear face, but also on the sides of said motor vehicle 2.
[0071] A non-limiting embodiment of a lighting device 1 arranged on the front face of a motor vehicle 2 is given as a non-limiting example in the remainder of the description.
[0072] like Figure 1 and Figure 2 As shown, the lighting device 1 for a vehicle 2 comprises:
[0073] - at least one lighting module 10, and
[0074] - an exit outer lens 11, and
[0075] - a decoupling undulating structure 12, and
[0076] -Intermediate screen 13.
[0077] like Figure 1As shown, the lighting device 1 further comprises a housing 14 , which is configured to specifically accommodate the at least one lighting module 10 , the decoupling relief structure 12 , and the intermediate screen 13 .
[0078] The elements of the light emitting device 1 are described in detail below.
[0079] The at least one light emitting module 10 is described in detail below.
[0080] exist Figure 2 In the non-limiting embodiment shown, the lighting device 1 comprises two lighting modules 10. In the remainder of the description, this non-limiting embodiment will be considered by way of a non-limiting example.
[0081] Each light emitting module 10 is configured to generate a primary light beam R1 ( Figure 1 ) to perform their dedicated primary optical function f1. The primary light ray R1 is emitted in the direction r1. The primary light ray R1 will pass through the intermediate screen 13 and then through the exit outer lens 11.
[0082] Each lighting module 10 includes at least one primary light source 100 ( Figure 1 ), the at least one primary light source is configured to generate the primary light R1.
[0083] In one non-limiting embodiment, the at least one primary light source 100 is a semiconductor light source. In a non-limiting embodiment, the semiconductor light source forms part of a light emitting diode. By light emitting diode is meant any type of light emitting diode, whether LED, OLED (organic LED), AMOLED (active matrix organic LED) or FOLED (flexible OLED) in a non-limiting example. In another non-limiting embodiment, the at least one primary light source 100 is a halogen lamp or a xenon lamp.
[0084] Each light emitting module 10 is configured to perform a primary optical function f1 .
[0085] In a non-limiting embodiment, the first lighting module is a lighting module and the second lighting module is also a lighting module. In a non-limiting embodiment, the lighting module may be a lighting module that generates at least one of the following light beams: a cut-off beam, a high beam, or an adaptive beam.
[0086] Thus, in a non-limiting embodiment, the first lighting module 10 is configured to perform a first primary optical function f1.1 (in this case, a high beam), and the second lighting module 10 is configured to perform a second primary optical function f1.2 (in this case, a low beam). Thus, in this case, the lighting device 1 is configured to perform two alternative lighting functions. In a manner known to those skilled in the art, the light beam Lx from the first lighting module 10 as a high beam is concentrated along the optical axis of the first lighting module 10, and the light beam Lx from the second lighting module 10 as a low beam is a cut-off beam. These two light beams Lx form the entire light beam.
[0087] The exit outer lens 11 will now be described in detail below.
[0088] like Figure 1 and Figure 2 As shown, the exit outer lens 11 is arranged to face the intermediate screen 13 and the light module 10. The exit outer lens is used as an outer lens for closing the housing 14. The exit outer lens is arranged to directly face the intermediate screen 13, which itself is located between the exit outer lens 11 and the light module 10.
[0089] In a non-limiting embodiment, the exit outer lens 11 is made of transparent plastic or glass. In a non-limiting variant embodiment, the exit outer lens is made of PMMA (polymethyl methacrylate).
[0090] The light beam Lx from each light emitting module 10 passes through the exit outer lens 11 and is emitted toward the outside of the motor vehicle 2. Figure 1 As shown, the primary light ray R1 of the light beam Lx enters the exit outer lens 11 along the direction r2 and leaves the exit outer lens 11 along the direction r3.
[0091] like Figure 1 As shown, the exit outer lens 11 has:
[0092] an inner face 11 . 1 , facing the interior of the motor vehicle 2 , also referred to as inner skin 11 . 1 ,
[0093] an outer face 11 . 2 , facing the outside of the motor vehicle 2 , also referred to as outer skin 11 . 2 ,
[0094] - A thickness e1 delimited by the outer face 11.2 and the inner face 11.1.
[0095] The primary light ray R1 propagates through the thickness e1 of the exit outer lens 11 .
[0096] In a non-limiting embodiment, the exit outer lens 11 is curved, that is, its inner face 11 . 1 is curved and its outer face 11 . 2 is curved.
[0097] In a non-limiting embodiment, the thickness e1 is greater than 2 millimeters (mm). In a non-limiting variant embodiment, this thickness is substantially equal to 2.7 mm.
[0098] In a non-limiting embodiment, the exit outer lens 11 is a so-called neutral exit outer lens, in other words, when the primary light rays R1 pass through the exit outer lens and are emitted toward the outside, the exit outer lens will not affect the direction of these primary light rays. The primary light rays R1 enter through the inner face 11.1 of the exit outer lens along the direction r2 and are emitted through the outer face 11.2 of the exit outer lens along the direction r3.
[0099] In order to obtain a neutral exit outer lens 11, in a non-limiting embodiment, the inner face 11.1 is arranged so that the thickness e1 of the exit outer lens 11 varies. The outer face 11.2 represents the style surface and the aerodynamic surface of the exit outer lens 11. Therefore, the outer face is not modified. The inner face 11.1 is modified to modify the thickness e1. Therefore, in order to modify the thickness e1, the orientation of the inner face 11.1 is locally modified to obtain the neutral effect of the exit outer lens 11 on the primary light rays R1, so that the primary light rays R1 of the light beam Lx are emitted from the outer face 11.2 along the direction r3 that is the same as or parallel to the direction r2 in which they enter through the inner face 11.1 of the exit outer lens 11. Therefore, the inner face 11.1 includes locally different surface orientations. These local surface orientations are functions of the local curvature of the curve of the exit outer lens 11, in particular the local curvature of the curve of its outer face 11.2.
[0100] The modification of the thickness e1 of the exit outer lens 11 means that the inner face 11 . 1 and the outer face 11 . 2 are not parallel to each other. In a non-limiting example, the thickness e1 varies between 2.5 mm and 3.5 mm, which facilitates the design of the exit outer lens 11 .
[0101] Locally modifying the orientation of the inner face 11.1 will allow changing the direction of the primary rays R1. Thus, when the primary rays R1 enter the inner face 11.1 in direction r2, they will be locally deflected by the local orientation of the inner face 11.1, which will change their direction r2. Thus, when they pass through the exit outer lens 11, their direction will be different from the direction r2 in which they entered the inner face 11.1. When the primary rays R1 are again locally deflected by the curve of the outer face 11.2, they will leave the outer face 11.2 in a direction r3 that is the same as or parallel to the direction r2 in which they entered the inner face 11.1.
[0102] The thickness e1 varies along the maximum dimension (i.e., the length along the longitudinal axis AY substantially perpendicular to the vehicle axis AX when the lighting device 1 is mounted on the motor vehicle 2). In a non-limiting embodiment, the thickness e1 of the exit outer lens 11 varies gradually (this is also called a monotonic variation), so that the variation of the thickness e1 is invisible to the naked eye and the light beam Lx from the lighting module 10 is not disturbed. The variation of the thickness e1 is very small, so that internal reflections can be avoided. In a non-limiting example of an embodiment, the variation is between 0.3 mm and 0.7 mm.
[0103] Thus, in a non-limiting embodiment, the thickness e1 increases in a direction away from the fender of the motor vehicle 2 , in other words, the thickness decreases in a direction towards the fender of the motor vehicle 2 .
[0104] As seen by an outside observer, Figure 5 , the exit outer lens 11 is shown from the front. The exit outer lens is positioned in front of an intermediate screen 13, which comprises a decoupling relief structure 12 on its first face 13.1, and in front of a light module 10 located behind the intermediate screen 13. The first light module 10 (the light module on the right) is arranged on the side facing the center of the front face of the motor vehicle 2, and the second light module 10 (the light module on the left) is arranged on the side facing the fender of the motor vehicle 2.
[0105] exist Figure 5 In the non-limiting example of the embodiment shown in , the thickness e1 of the exit outer lens 11 comprises:
[0106] a value v1.a equal to 3.27 mm for the portion 11.a of the exit outer lens 11, this portion being positioned facing the end 10.a of the first light module 10, said end 10.a being positioned on the side towards the centre of the front face of the motor vehicle 2,
[0107] - a value v1.b for the portion 11.b of the exit outer lens 11 adjacent to the portion 11.a, which is equal to 3.12 mm,
[0108] a value v1.c for a portion 11.c of the exit outer lens 11 adjacent to the portion 11.b, equal to 2.97 mm, said portion 11.c being positioned substantially facing the center of the first lighting module 10,
[0109] a value v1.d equal to 2.82 mm for a portion 11.d of the exit outer lens 11 adjacent to the portion 11.c, said portion 11.d being positioned substantially facing the center of the first light-emitting module 10 and its other end 10.b and also opposite the space between these two light-emitting modules 10,
[0110] A value v1.e for a portion 11 .e of the exit outer lens 11 adjacent to the portion 11 .d , which is equal to 2.52 mm, said portion 11 .e being positioned facing substantially the entire second lighting module 10 .
[0111] exist Figure 5 In FIG. 1 , the individual parts 11 a to 11 e of the exit outer lens 11 are defined by dotted lines.
[0112] Therefore, the primary light rays R1 passing through the exit outer lens 11 thus made neutral will not deviate from the direction r2 from which they entered through the exit outer lens 11. The exit outer lens 11 will not cause any interference to their path. This reduces the influence of the curved geometry of the exit outer lens 11 on the primary light rays R1 emitted by the light module 10. Therefore, the primary optical function f1 performed by the light module 10 is not affected by the curved geometry of the exit outer lens 11.
[0113] Since the neutrality of the exit outer lens 11 is known to those skilled in the art, it will not be described in detail in the specification.
[0114] The intermediate screen 13 will now be described in detail below.
[0115] like Figure 1 and Figure 2 As shown, the intermediate screen 13 is arranged between the light emitting module 10 and the exit outer lens 11 .
[0116] The intermediate screen 13 is configured to perform a secondary optical function f2. In a non-limiting embodiment, the secondary optical function f2 is a signaling function. In another non-limiting embodiment, the secondary optical function f2 is an optical function that makes it possible to highlight the primary optical function f1.
[0117] In a non-limiting embodiment, the signaling function is:
[0118] - turn indicators, or
[0119] - Daytime running lights, or
[0120] - parking lights, or
[0121] - clearance lights, or
[0122] - brake lights, or
[0123] - Reversing lights, or
[0124] -Fog lights, or
[0125] - Side markings.
[0126] like Figure 1 As shown, the middle screen 13 has:
[0127] a first face 13 . 1 , facing the light module 10 , also referred to as the inner face 13 . 1 ,
[0128] - a second face 13.2, facing the exit outer lens, also called outer face 13.2,
[0129] -Thickness e2.
[0130] The intermediate screen 13 is curved, that is to say, a first side 13 . 1 of the intermediate screen is curved and a second side 13 . 2 of the intermediate screen is curved.
[0131] In a non-limiting embodiment, the intermediate screen 13 is made of transparent plastic. In a non-limiting variant embodiment, the intermediate screen is made of PMMA (polymethyl methacrylate). In a non-limiting embodiment, the thickness e2 of the intermediate screen is between 2 mm and 5 mm. This makes it easier to manufacture by injection molding.
[0132] The primary light ray R1 of the light beam Lx from each light module 10 enters through the first face 13 . 1 of the intermediate screen 13 in the direction r1 and leaves through the second face 13 . 2 of the intermediate screen 13 in the direction r2 to reach the exit outer lens 11 .
[0133] like Figure 2 As shown, the intermediate screen 13 comprises a decoupling relief structure 12. In a non-limiting embodiment, the decoupling relief structure 12 is arranged on a first face 13.1 thereof.
[0134] like Figure 2 and Figure 3 As shown, in a non-limiting embodiment, the light emitting device 1 further comprises a secondary light source 130 as a semiconductor light source. In a non-limiting embodiment, the semiconductor light sources each form a part of a light emitting diode. In a non-limiting embodiment, each semiconductor light source forms a part of a light emitting diode. A light emitting diode is given to refer to any type of light emitting diode, in a non-limiting example, whether these light emitting diodes are LEDs, OLEDs (organic LEDs), AMOLEDs (active matrix organic LEDs) or FOLEDs (flexible OLEDs). The secondary light source 130 is configured to be turned on during the day (when the primary optical function f1 is turned off) and at night (when the primary optical function f1 is turned on).
[0135] like Figure 3 As shown, in a non-limiting embodiment, the secondary light source 130 is arranged on a portion of the periphery 131 of the intermediate screen 13. The secondary light source 130 and the intermediate screen 13 are arranged so that the secondary light rays R2 enter through the edge of the intermediate screen 13 separating the first face 13.1 from the second face 13.2.
[0136] The secondary light source 130 generates secondary light rays R2 which propagate through the thickness e2 of the intermediate screen 13. The secondary light rays R2 propagate through the thickness e2 of the intermediate screen 13 via successive reflections on the faces 13.1 and 13.2 of the intermediate screen 13. Due to total internal reflection between the first face 13.1 and the second face 13.2 of said intermediate screen 13, the light from the secondary light source 130 is captured in the intermediate screen 13. The intermediate screen 13 thus acts as a light guide.
[0137] The secondary rays R2 interact with the decoupling relief structure 12. The secondary light source 130 is arranged such that the secondary rays R2 enter the intermediate screen 13 and then propagate therein by internal reflection and emerge from the intermediate screen when they encounter said decoupling relief structure 12.
[0138] The decoupling relief structure 12 is configured to decouple the secondary light rays R2 generated by the secondary light source 130. The relief 120 of the decoupling relief structure 12 is a local modification of the relief of the face on which it is located, i.e. in this case the first face 13.1 of the intermediate screen 13. The relief makes it possible to obtain several diffuse focuses for the secondary light rays R2.
[0139] In a non-limiting embodiment, the first face 13.1 of the intermediate screen 13 comprises smooth portions 1301 and undulating portions 1300, which form a decoupled undulating structure 12. In a non-limiting embodiment, the surface area of the first face 13.1 occupied by each of the undulating portions 1300 is smaller than the surface area occupied by the smooth portions 1301. In a non-limiting embodiment, the smooth portions 1301 are separated by the undulating portions 1300. In a non-limiting embodiment, the first face 13.1 comprises alternating undulating portions 1300 and smooth portions 1301.
[0140] In a non-limiting embodiment, the decoupling relief structure 12 comprises a plurality of:
[0141] - microdisks, which are obtained by laser shock, also called microlenses, and / or
[0142] - micro cones, and / or
[0143] - microconical prisms, and / or
[0144] - micro prisms, and / or
[0145] - Granulation department.
[0146] The relief 120 is thus a micro-disk and / or a micro-cone and / or a micro-cone prism and / or a micro-prism and / or a granular portion. The relief 120 has walls that are at least partially diffuse. Thus, the decoupled relief structure 12 forms a diffuse surface. Such a diffuse surface is often described as a microlens surface. In a non-limiting embodiment, micro or micro means that the relief 120 has:
[0147] - a depth between 0.1 mm and 0.4 mm,
[0148] a distance between two reliefs 120 of between 0.8 mm and 1.25 mm,
[0149] - A width between 0.16 mm and 0.3 mm.
[0150] Figure 4 A non-limiting embodiment of the relief 120 of the decoupling relief structure 12 is shown, which is a microdisk. In this case, the microdisk forms a recess relative to the substantially smooth surface of the first face 13.1. In a non-limiting embodiment, the recess has a thickness of 0.05 mm. 2 With 5mm 2 The apparent surface area between the concave portions and the concave portions is 1 / 2 of the decoupling relief structure 12. In a non-limiting embodiment, the concave portions have a depth of the order of tens of micrometers. The distribution of the relief portions 120 of the decoupling relief structure 12 is random, regular, or follows one or more patterns. All patterns together make it possible to have a specific feature. Figure 3 In a non-limiting example of the invention, the feature is defined by a set of reliefs 120 forming diagonal lines spaced apart from each other. In a non-limiting embodiment, the shape of the reliefs 120 is circular or rectangular or any other type of shape. Each relief 120 forms a diffuse focus 1200. By means of this decoupled relief structure 12, the secondary rays R2 (called grazing rays) near the first face 13.1 of the intermediate screen 13 will be diffused in all directions (by Figure 4 ). Each relief 120 then behaves like a secondary light source. The reliefs 120 are positioned so that their influence on the primary light R1 is minimized. Since such a decoupled relief structure 12 with microdisks is known to those skilled in the art, it will not be described in detail here.
[0151] The decoupled relief structure 12 creates the effect that the intermediate screen 13 is illuminated over a portion of its surface or over its entire surface: the observer will see that the entire surface of the lighting device 1 is lit. This creates an optical illusion that gives the impression of a three-dimensional lighting device 1, highlighting the style of the motor vehicle 2. The features of the lighting device 1 are therefore always present, whether the lighting device is turned on or off (i.e. whether the primary optical function f1 is turned on or off).
[0152] In order to prevent the curved geometry of the intermediate screen 13 from affecting the primary optical function f1 performed by the lighting module 10 of the lighting device 1, in other words, to prevent the primary light R1 generated by the primary light source 100 from deviating from its direction r1 due to this intermediate screen 13, the intermediate screen 13 has a non-constant thickness e2, so that the primary light R1 of the light beam Lx is emitted from the second surface 13.2 along a direction r2 that is the same as or parallel to the direction r1 in which they entered through the first surface 13.1 of the intermediate screen 13.
[0153] Compared to the neutrality of the exit outer lens 11 described above, a reverse neutrality is applied to the intermediate screen 13. The intermediate screen 13 is therefore referred to as a neutral intermediate screen 13. Specifically, in this case, in order to obtain a neutral intermediate screen 13, in a non-limiting embodiment, the second face 13.2 is arranged so that the thickness e2 of the intermediate screen 13 varies. Therefore, in order to modify the thickness e2 of the intermediate screen 13, the orientation of the second face 13.2 (i.e. the outer face) is locally modified to obtain a neutral effect of the intermediate screen 13 on the primary light rays R1. The inner face is not modified, as is the case with the exit outer lens 11. Therefore, the decoupling relief structure 12 located on the first face 13.1 of the intermediate screen 13 is not touched. Therefore, the outer face 13.2 includes a locally different surface orientation.
[0154] The modification of the thickness e2 of the intermediate screen 13 means that the first face 13 . 1 and the second face 13 . 2 are not parallel to each other. In a non-limiting example, the thickness e2 varies between 2.1 mm and 3.5 mm, which facilitates the design of the intermediate screen 13 .
[0155] Locally modifying the orientation of the second face 13.2 will allow changing the direction of the primary rays R1. Thus, when the primary rays R1 enter the first face 13.1 in direction r1, they will be locally deflected by the curve of the first face 13.1, but when they leave the second face 13.2, the second face will locally straighten their direction r1 so that they leave in a direction r2 that is the same as or parallel to the direction r1 in which they entered the intermediate screen 13. These local surface orientations are a function of the local curvature of the curve of the intermediate screen 13, in particular of the local curvature of the curve of the first face 13.1.
[0156] The thickness e2 varies along the largest dimension, i.e. the length along the longitudinal axis AY substantially perpendicular to the vehicle axis AX when the light emitting device 1 is mounted on the motor vehicle 2. In a non-limiting embodiment, the thickness e2 varies gradually (this is also called a monotonic variation) so that the light beam is not disturbed. The variation of the thickness e2 is very small so that internal reflections can be avoided. In a non-limiting example of an embodiment, the variation is less than 0.7 mm.
[0157] Thus, in a non-limiting embodiment, the thickness e2 increases in a direction away from the fender of the motor vehicle 2 , in other words, the thickness decreases in a direction towards the fender of the motor vehicle 2 .
[0158] exist Figure 6 1 shows the intermediate screen 13 from the perspective of an external observer, without the exit outer lens 11. Thus, the intermediate screen 13 is shown from the front, without the decoupling relief structure 12, which is arranged in front of the light modules 10. The first light module 10 (the light module on the right) is arranged on the side facing the center of the front face of the motor vehicle 2, and the second light module 10 (the light module on the left) is arranged on the side facing the fender of the motor vehicle 2.
[0159] exist Figure 6 In the non-limiting example of the embodiment shown in , the thickness e2 comprises:
[0160] a value v2.a equal to 3.15 mm for the portion 13.a of the intermediate screen 13, which is positioned facing the end 10.a of the first lighting module 10, which is situated on the side facing the middle of the front face of the motor vehicle 2,
[0161] a value v2.b equal to 2.89 mm for the portion 13.b of the intermediate screen 13, which is adjacent to the portion 13.a and is positioned substantially facing the centre of the first lighting module 10 and the other end 10.b of said first lighting module 10,
[0162] a value v2.c equal to 2.53 mm for the portion 13.c of the intermediate screen 13, which is adjacent to the portion 13.b and is positioned substantially facing the end 10.a of the second lighting module 10 and its centre,
[0163] a value v2.d equal to 2.38 mm for the portion 13.d of the intermediate screen 13, which is adjacent to the portion 13.c and is positioned facing the side of the second lighting module 10 situated on the side of the end facing the front face of the motor vehicle 2,
[0164] a value v2.e equal to 2.12 mm for the portion 13 . e of the intermediate screen 13 , which is adjacent to the portion 13 . d and is positioned facing the other end 10 . b of the second lighting module 10 , said end 10 . b being on the side facing the fender of the motor vehicle 2 .
[0165] Figure 7The photometric distribution of the entire light beam from the lighting device 1, comprising the aforementioned intermediate screen 13 and the aforementioned neutral exit outer lens 11, is shown. In the non-limiting example considered, the entire light beam is composed of two light beams Lx from two lighting modules 10. Therefore, in the non-limiting example considered, the entire light beam is composed of a high beam and a low beam. Point P0 represents the cut-off line of the low beam.
[0166] Figure 7 The luminosity curves C are shown. Each luminosity curve C has a luminous intensity value shown in brackets. Figure 7 The farther away from the point D shown in (which is the point of highest luminous intensity), the more the luminous intensity decreases. Therefore, there is:
[0167] - at least one curve C1 having a luminous intensity of 250 Lux,
[0168] - at least one curve C2 having a luminous intensity of 438 lux,
[0169] - at least one curve C3 having a luminous intensity of 1000 lux,
[0170] - at least one curve C4 having a luminous intensity of 2000 lux,
[0171] - at least one curve C5 having a luminous intensity of 3750 lux,
[0172] - at least one curve C6 having a luminous intensity of 7500 lux,
[0173] - at least one curve C7 having a luminous intensity of 10000 lux,
[0174] - at least one curve C8 having a luminous intensity of 12500 lux,
[0175] - At least one curve C9 having a luminous intensity of 15000 lux.
[0176] As can be seen, the photometric measurement is less disturbed than:
[0177] - When there are only a neutral exit outer lens 11 and a non-neutral intermediate screen 13 (the non-neutral intermediate screen comprises a decoupling relief structure 12) ( Figure 8 ),
[0178] - When there is a non-neutral intermediate screen 13 (the non-neutral intermediate screen includes a decoupling relief structure 12) and a non-neutral exit outer lens ( Fig. 9 ).
[0179] As in Figure 7As can be seen in the figure, around and above point P0 (representing the cut-off line of the low beam), there is a plume (circled by a dotted circle), but the luminous intensity of the plume is not strong, in this case 250 lux; on the other hand, Figure 8 and Fig. 9 In Figure 1, around and above point P0, there is a more diffuse plume (outlined by a dotted circle) with a strong luminous intensity (up to 12,500 lux in this case). Figure 8 and Fig. 9 Such a plume with these high luminous intensities means that the light beam produced from the lighting device 1 for the low beam does not meet the regulatory requirements because it is too blinding, whereas Figure 7 In the embodiment, the low beam generated from the lighting device 1 does meet the regulatory requirements.
[0180] Of course, the description of the invention is not limited to the above-described embodiments and the above-described fields. Therefore, in another non-limiting embodiment, the relief 120 has a wall that is at least partially reflective. This makes it possible to produce a reflective focus. In this case, the surface state of the relief 120 will be slightly polished. Therefore, in another non-limiting embodiment, the relief 120 has a wall that is partially reflective and partially diffuse. This makes it possible to have a "mixed" reflective and diffuse focus. Therefore, in a non-limiting embodiment, the light emitting device 1 includes several intermediate screens 13, each of which may have its own distribution and / or type of relief 120. Therefore, in another non-limiting embodiment, the micro-disks of the decoupling relief structure 12 are replaced by micro-prisms. Therefore, in another embodiment, instead of forming a part of the first face 13.1 of the intermediate screen 13, the decoupling relief structure 12 forms a part of the second face 13.2 of the intermediate screen 13, in other words, the decoupling relief structure is arranged on the outer face 13.2. In this case, in a non-limiting variant embodiment, the decoupling relief structure 12 has a granular portion to perform a secondary optical function f2, which is a characteristic function.
[0181] The invention thus described has in particular the following advantages:
[0182] - avoiding modification of the first face 13.1 of the intermediate screen 13 having the decoupling relief structure 12. Thus, avoiding having to redesign the distribution and / or type of reliefs 120 each time the first face 13.1 is modified, which is necessary,
[0183] - avoiding modification of the outer face 11 . 2 of the exit outer lens 11 and thus making it possible to maintain the styling of the motor vehicle 2 ,
[0184] - Arranging the decoupling relief structure 12 on the intermediate screen 13 instead of on the exit outer lens 11 makes it possible to make the intermediate screen 13 neutral, since it is not constrained by a specific pattern. Therefore, the orientation of one of its faces (in this case the second face 13.2 that does not support the decoupling relief structure 12) can be adjusted; therefore, neither the curved shape of the intermediate screen 13 nor the decoupling relief structure 12 affects the direction of the primary light rays R1 generated by the lighting module(s) 10,
[0185] - arranging the decoupling relief structure 12 on the intermediate screen 13 instead of on the exit outer lens 11 also makes it possible to easily neutralize the exit outer lens 11 without modifying the style of said exit outer lens 11; therefore, the curved shape of the exit outer lens 11 does not affect the direction of the light generated by the (multiple) light modules 10,
[0186] Makes it possible to have one or more effective primary optical functions f1 which are not disturbed by the decoupling relief structure 12 .
Claims
1. A lighting device (1) for a vehicle (2), the lighting device (1) comprising: - at least one light emitting module (10) configured to generate primary light rays (R1) forming a light beam (Lx), - an exit outer lens (11), - a decoupled undulating structure (12), Characterized in that the light emitting device (1) further comprises: - an intermediate screen (13), the intermediate screen comprising the decoupling relief structure (12), the intermediate screen (13) being arranged between the at least one light-emitting module (10) and the exit outer lens (11), and having a first surface (13.1) facing the at least one light-emitting module (10) and a second surface (13.2) facing the exit outer lens (11), - the decoupling relief structure (12) is arranged on the first face (13.1) of the intermediate screen (13), the intermediate screen (13) having a non-constant thickness (e2) so that the primary rays (R1) of the light beam (Lx) are emitted from the second face (13.2) of the intermediate screen (13) along a direction (r2) that is the same as or parallel to the direction (r1) in which they entered through the first face (13.1) of the intermediate screen (13).
2. The light emitting device (1) according to claim 1, wherein: The second face (13.2) of the intermediate screen (13) comprises a locally different surface orientation.
3. A lighting device (1) as claimed in any one of the preceding claims, wherein: The exit outer lens (11) is a neutral outer lens.
4. A lighting device (1) as claimed in any one of the preceding claims, wherein: The thickness (e2) of the intermediate screen (13) varies between 2.1 mm and 3.5 mm.
5. A lighting device (1) as claimed in any one of the preceding claims, wherein: The thickness (e2) of the intermediate screen (13) changes gradually.
6. A lighting device (1) as claimed in any one of the preceding claims, wherein: The thickness (e2) of the intermediate screen (13) decreases towards the side intended to be closest to the fender of the motor vehicle.
7. A lighting device (1) as claimed in any one of the preceding claims, wherein: The at least one lighting module (10) comprises at least one primary light source (100), and the at least one primary light source is configured to generate the primary light (R1).
8. A lighting device (1) as claimed in any one of the preceding claims, wherein: The lighting device (1) further comprises a secondary light source (130) configured to generate secondary light rays (R2), the secondary light source (130) being arranged such that the secondary light rays (R2) enter the intermediate screen (13) and then propagate therein by internal reflection and are emitted from the intermediate screen when they encounter the decoupling relief structure (12).
9. A lighting device (1) as claimed in any one of the preceding claims, wherein: The primary light source (100) and / or the secondary light source (130) are semiconductor light sources.
10. The lighting device (1) as claimed in any one of the preceding claims, wherein: The decoupling undulating structure (12) comprises an undulating portion (120), wherein the undulating portion is: - microdisks obtained by laser shock, also called microlenses, and / or - micro cones, and / or - microconical prisms, and / or - micro prisms, and / or - Granulation department.
11. The lighting device (1) as claimed in any one of the preceding claims, wherein: The at least one lighting module (10) is configured to perform a primary optical function (f1) being a lighting function or a signaling function, and the intermediate screen (13) is configured to perform a secondary optical function (f2) being a signaling function.
12. The lighting device (1) as claimed in the preceding claim, wherein: The at least one light emitting module (10) is configured to perform a primary optical function (f1) as a lighting function.
13. A lighting device (1) as claimed in any one of the preceding claims, wherein: The lighting module is a lighting module that generates at least one light beam selected from the following: a cut-off beam, a high beam, or an adaptive beam.
14. The lighting device (1) as claimed in any one of the preceding claims, wherein: The light emitting device (1) is a headlamp.
15. The lighting device (1) according to any one of claims 1 to 11, wherein: The light emitting device (1) is a tail light.