GB2612064A - Light guide for a vehicle lamp assembly - Google Patents

Light guide for a vehicle lamp assembly Download PDF

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Publication number
GB2612064A
GB2612064A GB2115044.6A GB202115044A GB2612064A GB 2612064 A GB2612064 A GB 2612064A GB 202115044 A GB202115044 A GB 202115044A GB 2612064 A GB2612064 A GB 2612064A
Authority
GB
United Kingdom
Prior art keywords
light
light guide
guide assembly
assembly
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB2115044.6A
Other versions
GB202115044D0 (en
Inventor
Esders James
Morel Du Boil Christopher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jaguar Land Rover Ltd
Original Assignee
Jaguar Land Rover Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jaguar Land Rover Ltd filed Critical Jaguar Land Rover Ltd
Priority to GB2115044.6A priority Critical patent/GB2612064A/en
Publication of GB202115044D0 publication Critical patent/GB202115044D0/en
Priority to PCT/EP2022/078373 priority patent/WO2023066751A1/en
Publication of GB2612064A publication Critical patent/GB2612064A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/241—Light guides characterised by the shape of the light guide of complex shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/239—Light guides characterised by the shape of the light guide plate-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/243—Light guides characterised by the emission area emitting light from one or more of its extremities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/249—Light guides with two or more light sources being coupled into the light guide

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

Light guide assembly 1 for a vehicle lamp assembly includes a first light guide 15 having a first light input portion 17 and first light output portion 19, a collimator 21. The collimator directs light emitted from a light source 7 into the first light input portion of the first light guide. The first light input portion includes first optical elements each of which directs a portion of the light exiting the first light output portion along a respective light output path OP-1, the output light paths being parallel. The first light output portion may include an inclined region orientated at an oblique angle relative to a first longitudinal axis of the first light guide and the first optical elements may be situated in the inclined region. The output light paths may be parallel to the first longitudinal axis of the first light guide. Also claimed is a light guide assembly for a vehicle lamp assembly including a light guide with light input and output portions. The light input and output portions have respective light input and output surfaces. The light input portion also has dispersal optics for dispersing light entering the light guide.

Description

LIGHT GUIDE FOR A VEHICLE LAMP ASSEMBLY
TECHNICAL FIELD
The present disclosure relates to a light guide for a vehicle lamp assembly. Aspects of the invention relate to a light guide assembly, a light guide, a vehicle lamp assembly and a vehicle.
BACKGROUND
It is known to provide a transparent lens in a vehicle lamp assembly. The lens is configured to direct light from one or more light sources provided in the vehicle lamp assembly. The light sources may be visible within the vehicle lamp assembly.
It is an aim of the present invention to address one or more of the disadvantages associated with the prior art.
SUMMARY OF THE INVENTION
Aspects and embodiments of the invention provide a light guide assembly, a light guide, a vehicle lamp assembly and a vehicle as claimed in the appended claims According to an aspect of the present invention there is provided a light guide assembly for a vehicle lamp assembly, the light guide assembly comprising: a first light guide having a first light input portion and a first light output portion; a collimator for directing light emitted from a light source into the first light input portion of the first light guide; wherein the first light output portion comprises a plurality of first optical elements, the first optical elements being configured to direct a portion of the light exiting the first light output portion along a respective output light path, wherein the output light paths are substantially parallel. The first optical elements may be configured to refract the light exiting the first light guide such that the light travels along the respective output light paths.
The collimator is configured for directing light emitted from the light source into the first light input portion of the first light guide. The collimator is operative to collimate the light emitted by the light source to produce a beam of parallel rays of light. The collimator may have a first optical axis. The collimator may be configured to direct the light along a first optical axis. The first optical axis may be at least substantially parallel to a first vertical axis of the first light guide.
The first light output portion may comprise an inclined region oriented at an oblique angle relative to a first longitudinal axis of the first light guide. The plurality of first optical elements may be disposed in the inclined region of the first light output portion.
The output light paths may be at least substantially parallel to the first longitudinal axis of the first light guide. The light exiting the first light guide may travel at least substantially parallel to the first longitudinal axis.
The first optical elements may comprise first lenses. For example, the first optical elements may comprise first micro-lenses. The first optical elements may be arranged in a plurality of rows. The rows may be offset relative to each other along the central longitudinal axis to form the inclined region. Each row may comprise one or more of the first optical elements.
The first optical elements may each comprise an output surface. The output surface of each first optical element may be substantially planar or may be concave. The output surfaces may collectively form the first output surface of the first light guide. A normal to each output surface may extend substantially parallel to a longitudinal axis of the first light guide. The first optical elements may be offset from each other in a longitudinal direction. The first optical elements may each comprise an upper surface. The upper surfaces of each first optical element may be is substantially planar. A normal to each upper surface may extend substantially perpendicular to the longitudinal axis of the first light guide assembly.
The light guide assembly may comprise an optical modifier for redirecting the light in the first light guide towards the first light output portion. The optical modifier may comprise a parabolic lens. Alternatively, the optical modifier may comprise at least one redirecting surface. The redirecting surface may be configured to provide total internal reflection of the light within the first light guide. The redirecting surface may be inclined at an oblique angle to an inlet light path. The optical modifier may be configured to direct the light along a second optical axis. The second optical axis may be at least substantially parallel to a first longitudinal axis of the first light guide.
The optical modifier may be configured to redirect the light through an angle approximately equal to 90°. The optical modifier may be configured to define an angle of reflection in the range 300 to 60°. The optical modifier may be configured to define an angle of reflection in the range 40° to 50°. The optical modifier may be configured to define an angle of reflection of approximately 45°.
A plurality of the optical modifiers may be provided. The optical modifiers may be disposed for adjacent to each other. The optical modifiers may be offset from each other along the longitudinal axis.
The optical modifier may comprise one or more redirecting surface. The optical modifier may comprise first and second redirecting surfaces oriented at an acute angle relative to each other. The first and second redirecting surfaces may be arranged in a V-shaped configuration. The V-shaped configuration may open outwardly towards a front of the first light guide. A plurality of the optical modifiers may be disposed adjacent to each other, for example in a saw-tooth arrangement.
The or each redirecting surface may comprise a plurality of surface optics. The surface optics may be configured to introduce a limited spread into the light redirected towards the first light output portion. The surface optics may comprise a plurality of optical elements. The optical elements may, for example, each comprise a concave recess formed in the redirecting surface.
The collimator may be configured to direct light into the first light input portion along a first optical axis. The optical modifier may be configured to redirect the light along a second optical axis. The first and second optical axes may be substantially perpendicular to each other.
The first light guide may have a monolithic structure. The first light guide may be formed of a transparent plastic.
The first light guide may comprise a first outer surface having a lower refractive index than the first light guide. The lower refractive index may promote internal reflection of light within the first light guide.
The light guide assembly may comprise a second light guide having a second light input portion and a second light output portion. The first and second light guides may be configured such that light exiting the first light output portion of the first light guide is directed into the second light input portion of the second light guide.
The first light input surface of the first light guide and the second light output surface of the second light guide may be oriented at an oblique angle relative to each other. The first light input surface and the second light output surface may be arranged in a non-perpendicular arrangement.
The second light input portion and the second light output portion may be arranged substantially parallel to each other. The second light input portion may comprise a second light input surface; and the second light output portion may comprise a second light output surface.
The second light input surface and the second light output surface may be arranged substantially parallel to each other. The second light output surface may be at least substantially free of optical elements to re-direct the light at the second light output surface. In other words, the second light output surface may be formed at least substantially without optical elements that re-direct the light at the second light output surface. The second light output surface may comprise a polished surface. The second light output surface may comprise or consist of an at least substantially smooth surface.
The second light input portion may comprise dispersal optics for dispersing light entering the second light guide. The dispersal optics may be formed on the second light input surface.
The dispersal optics may comprise transverse optical elements and/or vertical optical elements. The transverse optical elements may extend parallel to a transverse axis. The vertical optical elements may extend parallel to a vertical axis. The transverse optical elements may each have a part-cylindrical external profile. The vertical optical elements may each have a part-cylindrical or a part-conical external profile. In the present embodiment, the vertical optical elements may each have a part-conical external profile. The vertical optical elements may each comprise a downward taper. The transverse optical elements and the vertical optical elements may subdivide the second light input surface into a plurality of second light input surfaces. Each of the second light input surfaces may be substantially planar. A normal of each of the second light input surfaces may be oriented parallel to a longitudinal axis.
At least in certain embodiments, the first optical elements are configured to direct a portion of the light exiting the first light output portion along an optical axis. The optical axis may, for example, be dependent on the configuration of the optical modifier and/or the first optical elements disposed in the first light guide. The second light input surface and/or the second light output surface may be oriented at an oblique angle to the optical axis. The second light input surface and/or the second light output surface may be non-perpendicular to the second optical axis. A normal to the second light input surface may be inclined at an oblique angle to the optical axis. A normal to the second light output surface may be inclined at an oblique angle to the optical axis.
The second light output portion of the second light guide may be configured to direct the light along a second optical axis. In use, the second optical axis may be disposed at least substantially horizontally. When installed in a vehicle, the light guide assembly may be configured such that the second optical axis is substantially parallel to a longitudinal axis of the vehicle.
The second light output portion may form an outer surface of the light guide assembly.
The second light guide may comprise a second upper surface and a second lower surface. At least one of the second upper surface and the second lower surface comprising a plurality of projections and/or a plurality of apertures for localised illumination of the second light guide.
The second light guide may have a monolithic structure. The second light guide may be formed of a transparent plastic.
According to a further aspect of the present invention there is provided a light guide having a light input portion and a light output portion. The light guide may be configured to receive light from another light guide. The light guide may comprise a light input portion comprising a light input surface; and a light output portion comprising a light output surface. The light input surface and the light output surface may be disposed at least substantially parallel to each other.
The light input portion may comprise dispersal optics for dispersing light entering the second light guide.
The dispersal optics may comprise transverse optical elements and/or vertical optical elements. The transverse optical elements may extend parallel to a transverse axis. The vertical optical elements may extend parallel to a vertical axis. The transverse optical elements may each have a part-cylindrical external profile. The vertical optical elements may each have a part-cylindrical or a part-conical external profile. In the present embodiment, the vertical optical elements may each have a part-conical external profile. The vertical optical elements may each comprise a downward taper. The transverse optical elements and the vertical optical elements may subdivide the light input surface into a plurality of light input surfaces. Each of the light input surfaces may be substantially planar. A normal of each of the light input surfaces may be oriented parallel to a longitudinal axis of the light guide.
At least in certain embodiments, the light may be introduced into the light along a first optical axis. The light input surface and/or the light output surface may be oriented at an oblique angle to the first optical axis. The light input surface and/or the light output surface may be non-perpendicular to the first optical axis. A normal to the light input surface and/or the light output surface may be inclined at an oblique angle to the first optical axis.
The light output portion of the light guide may be configured to direct the light along a second optical axis. In use, the second optical axis may be disposed at least substantially horizontally. The first optical axis and the second optical axis may be at least substantially parallel to each other. When installed in a vehicle, the light guide may be configured such that the second optical axis is substantially parallel to a longitudinal axis of the vehicle.
The light output surface may be at least substantially free of optical elements that would redirect the light at the light output surface. In other words, the light output surface may be formed at least substantially without optical elements that re-direct the light at the second light output surface. The light output surface may comprise or consist of a polished surface. The light output surface may comprise or consist of an at least substantially smooth surface.
The light output surface may form an outer surface of the light guide assembly.
According to a further aspect of the present invention there is provided a vehicle lamp assembly comprising a light guide assembly as described herein. The vehicle lamp assembly may comprise at least one light source. The at least one light source may be configured to emit light into the first light guide. The at least one light source may, for example, comprise a light emitting diode.
The second light output portion may form an exterior surface of the vehicle lamp assembly.
The vehicle lamp assembly may comprise an exterior lens. The exterior lens may be provided externally of the second light guide.
According to a further aspect of the present invention there is provided a vehicle comprising a vehicle lamp assembly as described herein.
Within the scope of this application it is expressly intended that the various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. That is, all embodiments and/or features of any embodiment can be combined in any way and/or combination, unless such features are incompatible. The applicant reserves the right to change any originally filed claim or file any new claim accordingly, including the right to amend any originally filed claim to depend from and/or incorporate any feature of any other claim although not originally claimed in that manner.
BRIEF DESCRIPTION OF THE DRAWINGS
One or more embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a side elevation of a vehicle incorporating first and second light guide assemblies in accordance with an embodiment of the present invention; Figure 2 shows a front elevation of the vehicle shown in Figure 1; Figure 3 shows a front perspective view of one of the light guide assemblies in accordance with an embodiment of the present invention; Figure 4 shows a rear perspective view of the light guide assembly shown in Figure 3; Figure 5 shows a schematic representation of the light path through first and second light guides disposed in the light guide assembly shown in Figures 3 and 4; Figure 6 shows a longitudinal sectional view through the light guide assembly shown in Figures 3 and 4; Figure 7A shows a perspective view of a light output portion of the first light guide in the light assembly; Figure 7B shows an enlarged view of the first optical elements disposed on the light output portion shown in Figure 7A; Figure 8 shows a rear perspective view of the second light guide in the light assembly; Figure 9 shows a rear elevation of the second light guide shown in Figure 8; Figure 10 shows a longitudinal sectional view through the second light guide shown in Figures 8 and 9; Figure 11A shows a perspective view of a light input portion of the second light guide in the light assembly; and Figure 11B shows an enlarged view of the optical elements disposed on the light input portion shown in Figure 11A.
DETAILED DESCRIPTION
A light guide assembly 1 in accordance with an embodiment of the present invention is described herein with reference to the accompanying Figures.
The light guide assembly 1 is provided in a vehicle lamp assembly 3 configured to be installed in a vehicle 5. The vehicle 5 may, for example, be an automobile, a sports utility vehicle or a utility vehicle. The light guide assembly 1 in accordance with the present embodiment is installed in an automobile 5, as shown in Figures 1 and 2. The light guide assembly 1 is described herein in relation to a reference frame comprising a longitudinal axis X, a transverse axis Y and a vertical axis 1 The reference frame of the light guide assembly 1 may be aligned with a vehicle reference frame.
The vehicle lamp assembly 3 in the present embodiment comprises a daytime running lamp unit for the automobile 5. Alternatively, or in addition, the vehicle lamp assembly 3 may comprise a head lamp or a fog lamp. The vehicle 5 comprises left and right light guide assemblies 1 provided on the left and right sides respectively of the vehicle 5. The light guide assembly 1 has substantially the same configuration on each side of the vehicle 5. For the sake of brevity, the light guide assembly 1 disposed on the right-hand side of the vehicle 5 is described herein. It will be understood that the light guide assembly 1 disposed on the left-hand side of the vehicle 5 has substantially the same configuration. The vehicle lamp assembly 3 may be configured to provide different functions. By way of example, the vehicle lamp assembly 3 may comprise or consist of one or more of the following: a turn signal lamp, a daylight running lamp, a head lamp, a position lamp; a fog lamp; a direction indicator lamp; and a turn signal lamp.
As shown in Figures 1 and 2, the vehicle lamp assembly 3 comprising the light guide assembly 1 is disposed at a front of the vehicle 5. A front perspective view of the vehicle lamp assembly 3 is shown in Figure 3; and a rear perspective view of the vehicle lamp assembly 3 is shown in Figure 4. The vehicle lamp assembly 3 comprises a plurality of light sources 7. The light sources 7 are configured to emit light. In the present embodiment, the light sources 7 are oriented at least substantially vertically. Each light source 7 in the present embodiment comprise a light emitting diode. Other types of light source 7 may be used in the vehicle lamp assembly 3. The light emitted by the light sources 7 is introduced into the light guide assembly 1. As described herein, the light guide assembly 1 is configured to re-direct the light emitted by the light sources 7 towards the front of the vehicle 5. A schematic representation of the light path through the vehicle lamp assembly 3 is shown in Figure 5. The light sources 7 in the present embodiment are configured to emit light of the same colour. In the present embodiment, the light sources 7 emit white light. In a variant, the light sources 7 may emit different colours of light to provide different signalling functions. The light guide assembly 1 may comprise two or more lamp units, for example to provide a turn signal lamp unit and a daylight running lamp unit.
The light guide assembly 1 comprises a first light guide 15 having a first light input portion 17 and a first light output portion 19. A front perspective view of the first light guide 15 is shown in Figure 3. The first light guide 15 is an at least substantially transparent member. The first light guide 15 in the present embodiment has a monolithic structure. The first light guide 15 is injection moulded from a transparent plastic material. The injection moulding of the first light guide 15 may comprise one or more injection shots into a mould cavity. The first light input portion 17 comprises a first input surface 17A; and the first light output portion 19 comprises a first output surface 19A. The first output surface 19A is oriented at an acute angle relative to the first input surface 17A. The first output surface 19A is an inclined surface which is oriented at an acute angle relative to the vertical axis Z. At least one collimator 21 is associated with the first light input portion 17. The at least one collimator 21 is configured to collimate the light emitted by the light sources 7 to produce a beam of parallel rays of light. As shown schematically in Figure 5, the collimator 21 has a first optical axis Z1. The first optical axis Z1 is aligned with the vertical axis Z. The first optical axis Z1 corresponds to an inlet light path PIN for the light introduced into the first light guide 15.
The at least one collimator 21 is formed integrally with the first light guide 15 in the present embodiment. In a variant, the at least one collimator 21 may be separate from the first light guide 15. The at least one collimator 21 may, for example, be mounted to the first light guide 15. The light from the collimator 21 is introduced into the first light guide 15 through the first input surface 17A. The first optical axis Z1 of the collimator 21 is disposed substantially perpendicular to the first input surface 17A.
As shown in Figure 5, the first light guide 15 comprises an optical modifier 23 for redirecting the light towards the first light output portion 19. In the present embodiment, the optical modifier 23 comprises a redirecting surface 25 configured to provide total internal reflection of the light introduced into the first light guide 15. The redirecting surface 25 is inclined at 45° to the first optical axis 71 of the or each collimator 21. The redirecting surface 25 is inclined at an oblique angle to the first optical axis Z1 of the or each collimator 21. The redirecting surface 25 is configured to re-direct the light towards the first light output portion 19. In the present embodiment, the redirecting surface 25 is configured to redirect the light through approximately 90° within the first light guide 15. The redirecting surface 25 is formed integrally with the first light guide 15. The redirecting surface 25 in the present embodiment comprises a plurality of surface optics 29 for introducing a limited spread into the light redirected towards the first light output portion 19. The surface optics 29 may be configured to control intensity distributions. In the present embodiment, the surface optics 29 comprise a plurality of concave recesses formed in the redirecting surface 25. The surface optics 29 may, for example, comprise pillow optics. Alternatively, or in addition, the surface optics 29 may comprise step optics, graining or a filter material. The contoured profile of the redirecting surface 25 is shown in the longitudinal sectional view of the light guide assembly 1 shown in Figure 6. The surface optics 29 are formed integrally with the first light guide 15. In a variant, the optical modifier 23 could comprise a parabolic lens. The redirecting surface 25 may have a lower refractive index than the remainder of the first light guide 15 to promote internal reflection. A coating may be applied to an exterior of the first light guide 15 to promote internal reflection. As shown in Figure 4, a central section of the first light guide 15 comprises a plurality of the redirecting surfaces 25 arranged in a saw-tooth pattern. The adjacent redirecting surfaces 25 are arranged in a V-shaped configuration in plan form which is open towards a front of the light guide assembly 1.
The first light output portion 17 comprises a plurality of first optical elements 31-n configured to direct at least a portion of the light exiting the first light guide 15 along respective output light paths OP-1. The first optical elements 31-n are formed integrally in the first output surface 19A of the first light guide 15. A front perspective view of the first light output portion 17 is shown in Figure 7A; and an enlarged view of the first optical elements 31-n is shown in Figure 78. The first optical elements 31-n refract the light exiting the first light guide 15 along the output light paths OP-1. The output light paths OP-1 are substantially parallel to each other. The first optical elements 31-n each comprise a first output surface 31A oriented towards a front of the first light guide assembly 1. The output surface 31A of each first optical element 31-n is substantially planar. The output surfaces 31A collectively form the first output surface 19A of the first light guide 15. The first optical elements 31-n each comprise an upper surface 31B. The upper surfaces 31B of each first optical element 31-n is substantially planar. A normal Ni (shown in Figure 73) to each upper surface 31B extends substantially perpendicular to the longitudinal axis X of the first light guide assembly 1. The normal Ni may extend along the vertical axis Z or may be inclined at an angle to the vertical axis Z. In the present embodiment, the normal Ni corresponds to a major axis of each first optical element 31-n. The orientation of the upper surfaces 31B of the first optical elements 31-n may reduce or limit optical leakage in a vertical direction. In the present embodiment, the output light paths OP-1 are aligned with a second optical axis X1. The second optical axis X1 is aligned with the longitudinal axis X of the first light guide 15. As shown in Figure 5, the first and second optical axes Z1, X1 may be at least substantially perpendicular to each other. Thus, the inlet light path PIN and the outlet light path OP-1 are substantially perpendicular to each other. The first optical elements 31-n comprise a plurality of discrete optical elements, for example comprising a plurality of micro-lenses. The first optical elements 31-n are formed integrally with the first light guide 15. In the present embodiment the first optical elements 31-n are moulded integrally with the first outlet surface 19A.
The first optical elements 31-n are arranged in a plurality of rows R-n. The rows R-n each comprise a plurality of the first optical elements 31-n disposed adjacent to each other. The rows R-n extend in a transverse direction extending at least substantially across a width of the first light guide 15. The rows R-n are offset from each other along the longitudinal axis X to form the inclined configuration of the first output surface 19A. As shown in Figure 73, the first optical elements 31-n have a staggered arrangement relative to each other along the longitudinal axis X. In the present embodiment, the first optical elements 31-n may optionally also have a staggered (stepped) arrangement relative to each other along the transverse axis Y. The light guide assembly 1 comprises a second light guide 35 having a second light input portion 37 and a second light output portion 39. The second light guide 35 is shown in Figures 3, 8 and 9. A longitudinal section through the second light guide is shown in Figure 10. The second light output portion 39 forms an outer surface of the second light guide 35. The second light input portion 37 and the second light output portion 39 extend substantially parallel to each other. The second light input portion 37 has a second light input surface 37A; and the second light output portion 39 has a second light output surface 39A. The second light output surface 39A has a smooth polished finish in the present embodiment. The second light output surface 39A is oriented at an oblique angle to the second optical axis X1. The second light output surface 39A is not normal to the second optical axis X1. The second light output surface 39A is configured to direct at least a portion of the light along output light paths OP-2. In the present embodiment, the output light path OP-2 is aligned with the second optical axis X1. The second optical axis X1 is at least substantially aligned with the longitudinal axis X of the first light guide 15.
The first and second light guides 15, 35 are mounted adjacent to each other in a face-to-face arrangement. The first light guide 15 is configured such that light exiting the first light output portion 17 is directed into the second light input portion 37. The second light input portion 37 in the present embodiment comprises dispersal optics 43 for dispersing light entering the second light guide. A portion of the second light input portion 37 is shown in Figure 11A; and an enlarged view of the dispersal optics 43 is shown in Figure 11B. The dispersal optics 43 in the present embodiment comprises a matrix arrangement composed of transverse optical elements 45A and vertical optical elements 45B. The transverse optical elements 45A extend parallel to the transverse axis Y; and the vertical optical elements 45B extend parallel to the vertical axis Z. The transverse optical elements 45A each have a part-cylindrical external profile. Alternatively, or in addition, the vertical optical elements 45B each have a part-cylindrical or a part-conical external profile. In the present embodiment, the vertical optical elements 45B each have a part-conical external profile. The vertical optical elements 45B each comprise a downward taper. The transverse optical elements 45A and the vertical optical elements 45 subdivide the second light input surface 37A into a plurality of second light input surfaces 450. Each of the second light input surfaces 450 is substantially planar. A normal of each of the second light input surfaces 45C may be oriented parallel to the longitudinal axis X. As shown in Figures 8 and 9, the second light guide 35 comprises an inboard section 47 and an outboard section 49. The inboard section 47 comprises a central aperture 51. As shown in Figure 6, the first light guide 15 comprises a bifurcated section comprising upper and lower guide elements 53, 55. The upper and lower guide elements 53, 55 are arranged in a V-shaped configuration in the present embodiment. The second light guide 35 comprises upper and lower sections 57, 59. The upper and lower guide elements 53, 55 in the first guide 15 are configured to introduce light into the upper and lower sections 57, 59 of the second light guide 35. The outboard section 49 comprises an elongated profile arranged in a blade profile.
The second light guide 35 comprises an upper surface 61 and a lower surface 63. As shown in Figure 10, the upper surface 61 comprises a plurality of localised optical features 65 to provide localised illumination. The localised optical features 65 may comprise a projection or an aperture. The localised optical features 65 are illuminated by the light introduced into the second light guide 35 from the first light guide 15. Alternatively, or in addition, localised optical features (not shown) may be provided on the lower surface 63. As shown in Figure 10, the localised optical features 65 may be arranged in a pattern, for example comprising a broken or continuous line. The second output surface 39A does not incorporate any of the localised optical features 65. Rather, the second output surface 39A has a smooth finish.
The second light guide 35 comprises an exterior lighting element for the vehicles. The second light guide 35 extends along the longitudinal axis X and provides an increased illumination area. The optical components of the first and second light guides 15, 35 are operative to provide directed illumination along the longitudinal axis X. The light guide assembly 1 according to the present embodiment at least partially obfuscates the interior components, such as the light sources 7.
The light guide assembly 1 in the present embodiment has been described with particular reference to the transverse portion of the vehicle lamp assembly 3. The vehicle lamp assembly 3 comprises an outboard section which extends upwardly. The relative positioning of the light sources 9 are modified to introduce light into the outboard section of the first light guide 15. In particular, the light sources 9 are disposed to a side of the first light guide 15. In the present embodiment, the light sources 9 are disposed in an outboard location relative to the first light guide 15. Alternatively, or in addition, the light sources 9 may be disposed in an inboard location relative to the first light guide 15. The light sources 9 and the at least one collimator 21 are arranged to introduce the light into the first light guide 15 along a first optical axis Y1 extending parallel to the transverse axis Y. The first optical axis Y1 is shown in Figure 4. The optical modifier 23 is configured to direct the light in the first light guide 15 towards the first light output portion 19.
As shown in Figure 5, a translucent exterior lens 67 may be provided in front of the light guide assembly 1.
The light guide assembly 1 has been described with reference to an arrangement in which the light sources 7 are disposed on a lower side of the first light guide 15. Alternatively, or in addition, the light sources 7 may be disposed on an upper side of the first light guide 15. The light sources 7 and the at least one collimator 21 may be disposed above the first light guide 15. The collimator 21 may be configured to introduce the light into the first light guide 15 along a first optical axis Z1 extending parallel to the vertical axis Z. The optical modifier 23 is configured to direct the light in the first light guide 15 towards the first light output portion 19.
In a further variant, the light sources may be disposed at a rear portion of the first light guide 15. The collimator 21 may be configured to introduce the light into the first light guide 15 along an optical axis X1 extending parallel to the longitudinal axis X. The optical modifier 23 may be omitted in this arrangement.
It will be appreciated that various changes and modifications can be made to the present invention without departing from the scope of the present application.

Claims (24)

  1. CLAIMS1. A light guide assembly for a vehicle lamp assembly, the light guide assembly comprising: a first light guide having a first light input portion and a first light output portion; a collimator for directing light emitted from a light source into the first light input portion of the first light guide; wherein the first light output portion comprises a plurality of first optical elements, the first optical elements being configured to direct a portion of the light exiting the first light output portion along a respective output light path, wherein the output light paths are substantially parallel.
  2. 2. A light guide assembly as claimed in claim 1, wherein the first light output portion comprises an inclined region oriented at an oblique angle relative to a first longitudinal axis of the first light guide; the plurality of first optical elements being disposed in the inclined region of the first light output portion.
  3. 3. A light guide assembly as claimed in claim 2, wherein the output light paths are at least substantially parallel to the first longitudinal axis of the first light guide. 20
  4. 4. A light guide assembly as claimed in claim 2 or claim 3, wherein the first optical elements are arranged in a plurality of rows, the rows being offset relative to each other along the first longitudinal axis to form the inclined region.
  5. 5. A light guide assembly as claimed in any one of the preceding claims comprising an optical modifier for redirecting the light in the first light guide towards the first light output portion.
  6. 6. A light guide assembly as claimed in claim 5, wherein the optical modifier is configured to redirect the light through approximately 900.
  7. 7. A light guide assembly as claimed in claim 5 or claim 6, wherein the optical modifier comprises at least one redirecting surface.
  8. 8. A light guide assembly as claimed in claim 7, wherein the optical modifier comprises first and second redirecting surfaces oriented at an acute angle relative to each other.
  9. 9. A light guide assembly as claimed in claim 7 or claim 8, wherein the or each redirecting surface comprises a plurality of surface optics for introducing a spread into the light redirected towards the first light output portion.
  10. 10. A light guide assembly as claimed in any one of claims 7, 8 or 9, wherein the collimator is configured to direct light into the first light input portion along a first optical axis; and the optical modifier is configured to redirect the light along a second optical axis; wherein the first and second optical axes are substantially perpendicular to each other.
  11. 11. A light guide assembly as claimed in any one of the preceding claims, wherein the first light guide has a monolithic structure formed of a transparent plastic.
  12. 12. A light guide assembly as claimed in any one of the preceding claims, wherein the first light guide comprises a first outer surface having a lower refractive index than the first light guide.
  13. 13. A light guide assembly as claimed in any one of the preceding claims comprising a second light guide having a second light input portion and a second light output portion, the first and second light guides being configured such that light exiting the first light output portion of the first light guide is directed into the second light input portion of the second light guide.
  14. 14. A light guide assembly as claimed in claim 13, wherein the second light input portion and the second light output portion are substantially parallel to each other.
  15. 15. A light guide assembly as claimed in claim 13 or claim 14, wherein the second light input portion comprises dispersal optics for dispersing light entering the second light guide.
  16. 16. A light guide assembly as claimed in any one of claims 13, 14 or 15, wherein the second light output portion comprises an at least substantially smooth surface.
  17. 17. A light guide assembly as claimed in any one of claims 13 to 16, wherein the second light guide comprises an upper surface and a lower surface, at least one of the upper surface and the lower surface comprising a plurality of projections and/or a plurality of apertures for localised illumination of the second light guide.
  18. 18. A light guide assembly as claimed in any one of claims 13 to 17, wherein the second light guide has a monolithic structure formed of a transparent plastic.
  19. 19. A light guide assembly for a vehicle lamp assembly, the light guide assembly comprising: a light guide comprising a light input portion having a light input surface. and a light output portion having a light output surface; wherein the light input portion comprises dispersal optics for dispersing light entering the light guide.
  20. 20. A light guide assembly as claimed in claim 19, wherein the dispersal optics comprise transverse optical elements and/or vertical optical elements.
  21. 21. A light guide assembly as claimed in claim 20, wherein the transverse optical elements and/or vertical optical elements subdivide the light input surface into a plurality of light input surfaces.
  22. 22. A vehicle lamp assembly comprising a light guide assembly as claimed in any one of the preceding claims and at least one light source.
  23. 23. A vehicle lamp assembly as claimed in claim 22 when dependent directly or indirectly on claim 13, wherein the second light output forms an outer surface of the vehicle lamp assembly.
  24. 24. A vehicle comprising a vehicle lamp assembly as claimed in claim 22 or claim 23.
GB2115044.6A 2021-10-20 2021-10-20 Light guide for a vehicle lamp assembly Pending GB2612064A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2115044.6A GB2612064A (en) 2021-10-20 2021-10-20 Light guide for a vehicle lamp assembly
PCT/EP2022/078373 WO2023066751A1 (en) 2021-10-20 2022-10-12 Light guide for a vehicle lamp assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2115044.6A GB2612064A (en) 2021-10-20 2021-10-20 Light guide for a vehicle lamp assembly

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GB202115044D0 GB202115044D0 (en) 2021-12-01
GB2612064A true GB2612064A (en) 2023-04-26

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GB2115044.6A Pending GB2612064A (en) 2021-10-20 2021-10-20 Light guide for a vehicle lamp assembly

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GB (1) GB2612064A (en)
WO (1) WO2023066751A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1826475A1 (en) * 2006-02-24 2007-08-29 Delphi Technologies, Inc. Flat lighting assembly with LED und light guide
DE102014102496A1 (en) * 2014-02-26 2015-08-27 Hella Kgaa Hueck & Co. Lighting device for vehicles
DE112014002880T5 (en) * 2013-06-18 2016-03-03 Koito Manufacturing Co., Ltd. vehicle light
JP2017010840A (en) * 2015-06-24 2017-01-12 株式会社小糸製作所 Vehicular lighting fixture
EP3179157A1 (en) * 2015-12-07 2017-06-14 Valeo Vision Transparent optical element having deflecting facets for image doublication
DE102018126955A1 (en) * 2017-11-01 2019-05-02 Varroc Lighting Systems, s.r.o. Optical fiber optic system
EP3671020A1 (en) * 2018-12-18 2020-06-24 Ningbo Geely Automobile Research & Development Co. Ltd. A vehicle lighting system
WO2021037587A1 (en) * 2019-08-28 2021-03-04 Valeo Vision Light-guiding assembly, vehicle lamp, and vehicle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1826475A1 (en) * 2006-02-24 2007-08-29 Delphi Technologies, Inc. Flat lighting assembly with LED und light guide
DE112014002880T5 (en) * 2013-06-18 2016-03-03 Koito Manufacturing Co., Ltd. vehicle light
DE102014102496A1 (en) * 2014-02-26 2015-08-27 Hella Kgaa Hueck & Co. Lighting device for vehicles
JP2017010840A (en) * 2015-06-24 2017-01-12 株式会社小糸製作所 Vehicular lighting fixture
EP3179157A1 (en) * 2015-12-07 2017-06-14 Valeo Vision Transparent optical element having deflecting facets for image doublication
DE102018126955A1 (en) * 2017-11-01 2019-05-02 Varroc Lighting Systems, s.r.o. Optical fiber optic system
EP3671020A1 (en) * 2018-12-18 2020-06-24 Ningbo Geely Automobile Research & Development Co. Ltd. A vehicle lighting system
WO2021037587A1 (en) * 2019-08-28 2021-03-04 Valeo Vision Light-guiding assembly, vehicle lamp, and vehicle

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WO2023066751A1 (en) 2023-04-27
GB202115044D0 (en) 2021-12-01

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