WO2023012651A1 - Ensemble de feux arrière de véhicule - Google Patents

Ensemble de feux arrière de véhicule Download PDF

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Publication number
WO2023012651A1
WO2023012651A1 PCT/IB2022/057143 IB2022057143W WO2023012651A1 WO 2023012651 A1 WO2023012651 A1 WO 2023012651A1 IB 2022057143 W IB2022057143 W IB 2022057143W WO 2023012651 A1 WO2023012651 A1 WO 2023012651A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
light source
light
assembly
present disclosure
Prior art date
Application number
PCT/IB2022/057143
Other languages
English (en)
Inventor
Lalit Ramesh Ahuja
Vaibhav Baranwal
Hansha PANDEY
Original Assignee
Varroc Engineering Limited
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 Varroc Engineering Limited filed Critical Varroc Engineering Limited
Publication of WO2023012651A1 publication Critical patent/WO2023012651A1/fr

Links

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
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/33—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors characterised by their material, surface treatment or coatings
    • 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
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof

Definitions

  • the present subject matter described herein in general, relates to automobiles. More particularly, the present subject matter relates to a rear light assembly in vehicles.
  • Taillights provide a safety aspect of the vehicle. They show the rear edge of the vehicle to allow other drivers to appropriately gauge the size and shape of the vehicle. In addition, they allow other vehicles to see the vehicle in inclement weather such as rain or snow.
  • Functionality of a rear lamp for a vehicle plays a vital role in the safety of the vehicle during night or hazardous driving conditions.
  • the taillight also highlights the vehicle’s profile.
  • These days the taillight function has also been evolved as a styling deed for effectively alerting other drivers and improving the illumination.
  • LED taillights usually require a plurality of light sources for the illuminating a large size reflector or for wide area illumination. Further, direct light from the taillight may disturb the vision of the other drivers. Also, most of the LED taillights rely on a plurality of light sources and special diffused lenses for achieving uniform illumination.
  • the present disclosure overcomes one or more shortcomings of the prior art and provides additional advantages discussed throughout the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other aspects and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
  • a light assembly for automotive comprising an outer lens, at least one light source operable to emit light, a first reflector of a first type, and a second reflector of a second type.
  • the at least one light source is positioned between the first reflector and the second reflector with an emitter end of the at least one light source facing the second reflector.
  • the second reflector is operable to form a virtual image of the at least one light source at a focal distance of the first reflector for illuminating the first reflector.
  • the virtual image of the at least one light source includes a virtual light source, and the first reflector is operable to reflect the light from the virtual light source towards the outer lens.
  • the light assembly further comprises a housing, a PCB circuitry comprising the at least one light source, and a driver circuitry for driving the PCB circuitry.
  • the PCB circuitry, the driver circuitry, the first reflector, and the second reflector are mounted on the housing, and the outer lens is fastened with the housing to form a closed light assembly.
  • the first reflector comprises at least one of: a parabolic reflector or a free form reflector
  • the second reflector comprises at least one of: a plane mirror or a curved mirror.
  • the at least one light source and the second reflector are positioned at a distance from the first reflector for forming the virtual image of the at least one light source at a focal distance of the first reflector.
  • the virtual image of the at least one light source is formed behind the second reflector and on a side opposite to that of the at least one light source.
  • the second reflector is operable to reflect the light coming from the at least one light source towards the first reflector and illuminate at least a portion of the first reflector.
  • the first reflector comprises at least one pattern on the surface for defocusing the light from the virtual light source.
  • the light assembly further comprises a processing unit in communication with the at least one light source, wherein the processing unit is operable to adjust lumen output of the at least one light source based on at least one criterion.
  • the at least one criterion includes one of: night light condition or stop/brake light condition.
  • the light assembly further comprises a PCB circuitry, wherein the at least one source and the processing unit are mounted on the PCB circuitry.
  • Fig. 1 illustrates a ray diagram of a light assembly, in accordance with an aspect of the present disclosure
  • Fig. 2(a) illustrates a front view of a light assembly, in accordance with an aspect of the present disclosure
  • Fig. 2(b) illustrates a sectional view of a light assembly, in accordance with an aspect of the present disclosure
  • Fig. 3 illustrates an exploded view of a light assembly, in accordance with an aspect of the present disclosure
  • Fig. 4(a) illustrates a front view of a reflector having defocussing pattern, in accordance with an aspect of the present disclosure
  • Fig. 4(b) illustrates a sectional view of a reflector having defocussing pattern, in accordance with an aspect of the present disclosure
  • Fig. 5 illustrates an illumination of the light assembly, in accordance with an aspect of the present disclosure
  • any block diagram herein represents conceptual views of illustrative systems embodying the principles of the present subject matter.
  • any flow charts, flow diagrams and the like represent various processes which may be substantially represented in computer readable medium and executed by a computer or processor, whether or not such computer or processor is explicitly shown.
  • taillamp “rear lamp”, and “tail light” have been alternatively used throughout the specification.
  • the light assembly comprises an outer lens, at least one light source operable to emit light, a first reflector of a first type, and a second reflector of a second type.
  • the at least one light source is positioned between the first reflector and the second reflector with an emitter end of the at least one light source facing the second reflector.
  • the second reflector is operable to form a virtual image of the at least one light source at a focal distance of the first reflector for illuminating the first reflector.
  • the virtual image of the at least one light source includes a virtual light source, and the first reflector is operable to reflect the light from the virtual light source towards the outer lens.
  • the virtual light source facilitates wide area illumination and avoids direct light on rear vehicle drivers.
  • Fig. 1 illustrates a ray diagram 100 of a light assembly, in accordance with an aspect of the present disclosure.
  • the ray diagram 100 comprises an internal setup of the light assembly.
  • the light assembly comprises an outer lens 101, a first reflector 109, a second reflector 105, and a light source 107.
  • the light source 107 is placed between the first and the second reflector 105, 109.
  • the light source 107 may be an LED source or bulb.
  • the light source 107 is not limited to above example and any other light source used in automotive or lighting application is well within the scope of the present disclosure.
  • an emitter end of the light source 107 may be facing the second reflector 105 for illuminating the second reflector 105.
  • the second reflector 105 may be operable to form a virtual image of the light source 107 on a side of the second reflector 105 which is opposite to that of the light source 105.
  • the virtual image of the light source 105 may be formed at focal point/distance ‘f of the first reflector 109.
  • the virtual image of the light source 105 act as a virtual light source 103 for illuminating the first reflector 109.
  • the light source 107 and the first reflector 105 may be place near to the first reflector 109.
  • a distance between the light source 107 and the first reflector 109 and a distance between the light source 107 and the second reflector 105 may be selected such that the virtual image of the light source 107 is formed at the focal point/distance of the first reflector.
  • the closely placed light source 107 is incapable of uniformly illuminating the first reflector 109.
  • the virtual light source 103 formed at the focal distance ‘f by the second reflector 105 is now capable of uniformly illuminating the first reflector 109.
  • the first reflector 109 is operable to reflect the light from the virtual light source 103 towards the outer lens 101, thereby facilitating wide area illumination with a closely placed light source 107 near the first reflector 109 inside a compact light assembly.
  • the light source 107 may be replaced by a plurality of light source to further increase the area of illumination.
  • a current through the light source 107 may be increased/decreased for increasing/decreasing the illumination of the light assembly.
  • the current through the light source 107 may be increased to indicate stop function to the rear vehicle drivers.
  • the light assembly may comprise a driver circuitry for controlling the current through the light source 107.
  • the driver circuit may be operated by the vehicle electronic control unit (ECU).
  • the driver circuitry may comprise a processing unit for controlling the current through the light source 107.
  • the light assembly facilitates wide area illumination with a single light source, tail and stop function with a single light source just by changing the light source current, uniform illumination on the reflector. Further, the light source is hidden so it does not affect the vision of the rear vehicle drivers.
  • Fig. 2(a) illustrates a front view 200a of a light assembly, in accordance with an aspect of the present disclosure.
  • the light assembly 200a may have an internal setup as illustrated in fig. 1.
  • the light assembly 200a may be operable to perform one or more functionality of taillamps or rear lamp in automotive applications.
  • the one or more functionality of taillamp may include tail light indication, stop indication, direction indication, etc.
  • Fig. 2(b) illustrates a sectional view 200b of a light assembly, in accordance with an aspect of the present disclosure.
  • the components of the light assembly illustrated in the sectional view 200b, and their respective functionalities are discussed in detail in explanation of fig. 3.
  • Fig. 3 illustrates an exploded view of a light assembly 300, in accordance with an aspect of the present disclosure.
  • the light assembly 300 may comprise an outer lens 301, a first reflector 305, a second reflector 303, a PCB circuitry 307, an inner lens 309, a driver PCB circuit 311, and a housing 313.
  • the arrangement of the components mentioned above is discussed in below paragraphs.
  • the first reflector 305 may have a hollow region for fixing the inner lens 309 by a fixing means such as screws.
  • the inner lens 309 may also have a hollow region comprising a slot for accommodating the PCB circuitry 307.
  • the PCB circuitry 307 may comprise at least one light source mounted and soldered on the PCB circuitry 307.
  • the al least one light source may be configured to emit light.
  • the inner lens 309 may be made up of transparent material.
  • the inner lens 309 may comprise a first end and second end.
  • the first end of the inner lens 309 is a closed end.
  • the inner lens 309 is inserted inside the first reflector 305 such that first end is fixed or attached to the back side of the first reflector using any fixing means known to a person skilled in the art.
  • the second end of the inner lens 309 is closed with the help of the second reflector 303 after the PCB circuitry 307 is mounted inside the inner lens 309.
  • the PCB circuitry 307 may be placed inside the inner lens 309 such that the emitter region of the at least one light source is facing the second reflector 303 for illuminating the seconds reflector.
  • the PCB circuitry 307 is driven or controlled using the driver PCB circuit 311.
  • the driver PCB circuit 311 may comprise a processing unit in communication with the at least one light source and is operable to adjust lumen output of the at least one light source based on at least one criterion.
  • the at least one criterion includes one of: night light condition or stop/brake light condition.
  • the driver PCB circuit 311 and the PCB circuitry 307 may be combined to form a single driver PCB for driving the current through the at least one source.
  • the light assembly may be connected to a body control module (present outside the light assembly) for controlling the current through the at least one light source and performing various functionalities of the taillight.
  • the lumen output of the at least one light source may be controlled using a processing unit mounted on the PCB circuitry 307.
  • the lumen output of the at least one light source may directly be controlled through the vehicle ECU on which the light assembly 300 is mounted.
  • the inner lens assembly along with driver PCB circuit 311 and the first reflector 305 may be mounted on the housing 313 and the housing 313 may be closed with the outer lens 301 as illustrated in sectional view of light assembly in fig. 2(b).
  • the first reflector 305 may be of the first type and the second reflector 303 may be of second type.
  • the first reflector 305 may comprise at least one of a: parabolic reflector or a free form reflector and the second reflector 303 may comprise at least one of: a plane mirror, a curved mirror, or any other reflective surface capable of above-mentioned functionality known to a person skilled in the art.
  • a curved mirror is selected as the second reflector 303 for achieving the uniform illumination or uniform distribution of the light from the light assembly.
  • a planer mirror is selected as the second reflector 303 for achieving the Lambertian distribution of light from the light assembly.
  • the first reflector 305 and the second reflector 303 are not limited to above mentioned example and may be any other type of reflector selected based on the required illumination.
  • the second reflector 303 may be operable to form a virtual image of the at least one light source at a focal distance of the first reflector 305 for illuminating the first reflector.
  • the virtual image of the at least one light source may include or act as a virtual light source for illuminating the first reflector.
  • the first reflector 305 may be operable to reflect the light from the virtual light source towards the outer lens.
  • the inner lens 309 is designed in such a manner that the at least one light source mounted on the PCB circuitry 307 and the second reflector 303 are positioned at a distance from the first reflector 305 for forming the virtual image of the at least one light source at a focal distance of the first reflector 305, as illustrated in ray diagram of fig. 1.
  • the virtual image of the at least one light source is formed behind the second reflector 305 and on a side opposite to that of the at least one light source.
  • the second reflector 303 may be operable to reflect the light coming from the at least one light source towards the first reflector 305 using the virtual light source and illuminate at least a portion of the first reflector 305.
  • the first reflector 305 reflects the light incident on the first from the virtual light source towards the outer lens 301.
  • the driver PCB circuit 311 may comprise a wiring harness and connector to the vehicle
  • the light assembly facilitates wide area illumination with a single light source, tail and stop function with a single light source just by changing the light source current, uniform illumination on the reflector. Further, the light source is hidden so it does not affect the vision of the rear vehicle drivers.
  • the processing unit and ECU may include, but are not restricted to, a general-purpose processor, a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), microprocessors, microcomputers, micro-controllers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions.
  • a general-purpose processor a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), microprocessors, microcomputers, micro-controllers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions.
  • FPGA Field Programmable Gate Array
  • ASIC Application Specific Integrated Circuit
  • DSP Digital Signal Processor
  • Fig. 4(a) illustrates a front view of a reflector having defocussing pattern, in accordance with an aspect of the present disclosure
  • fig. 4(b) illustrates a sectional view of a reflector having defocussing pattern, in accordance with an aspect of the present disclosure
  • the first reflector of the light assembly may comprise at least one pattern 401 on the surface of the reflector for creating an illumination pattern from the light assembly.
  • the at least one pattern 401 may be created by creating at least one duct on the surface of the first reflector.
  • the at least one pattern 401 may be created by masking at least a portion of the reflector. The masking may be done through an opaque material.
  • the at least one pattern 401 formed by the duct or masking act as defocusing region and absorbs light from the virtual light source (as discussed in above paragraphs).
  • the at least one pattern 401on the surface of the reflector does not reflect the light falling on the at least one pattern 401, thereby creating an illumination pattern or lit appearances for the rear vehicle drivers.
  • the at least one pattern 401 may vary based on the desired or required illumination pattern.
  • the techniques of the at least one pattern 401 is not limited to above example and any other technique for creating a defocussing zone on the reflector is well within the scope of present disclosure.
  • Fig. 5 illustrates an illumination of the light assembly, in accordance with an aspect of the present disclosure.
  • the illumination generated by the light assembly may comprise a central dark region due to the presence of the inner lens assembly as discussed in above aspects.
  • the first reflector of the light assembly may comprise a plurality of concentric patterns around the inner lens assembly that are equally spaced from each other. The plurality of concentric patterns acts as defocussing zone that absorbs light, thereby creating an illumination pattern or lit appearance on the surface of the outer lens of the light assemble that is visible to the rear vehicle drivers.
  • the different lit appearances generated by the light assembly may effectively alert the rear vehicle drivers to appropriately gauge the size and shape of the vehicle.
  • illumination pattern shown in fig. 5 is an exemplary pattern and any other pattern created by creating defocusing zone on the surface of the reflector is well within the scope of the present disclosure.
  • the present disclosure provides a low cost and effective light assembly that efficiently alert other drivers.
  • the present disclosure provides higher design of freedom and better visibility.
  • the light assembly facilitates wide area illumination with a single light source.
  • the light assembly facilitates tail and stop function with a single light source just by changing the light source current.
  • the light source is hidden and there is no impact on the vision of the rear vehicle drivers.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente divulgation concerne un ensemble de feux pour un véhicule automobile. L'ensemble de feux comprend une lentille externe, au moins une source de lumière pouvant fonctionner pour émettre de la lumière, un premier réflecteur d'un premier type et un second réflecteur d'un second type. Au moins une source de lumière est positionnée entre le premier réflecteur et le second réflecteur, une extrémité d'émetteur de l'au moins une source de lumière faisant face au second réflecteur. Le second réflecteur permet de former une image virtuelle de l'au moins une source de lumière à une distance focale du premier réflecteur pour éclairer le premier réflecteur. L'image virtuelle de l'au moins une source de lumière comporte une source de lumière virtuelle, et le premier réflecteur permet de réfléchir la lumière provenant de la source de lumière virtuelle en direction de la lentille externe. Ainsi, la source de lumière virtuelle facilite un éclairage large et évite la lumière directe sur les conducteurs de véhicule à l'arrière.
PCT/IB2022/057143 2021-08-02 2022-08-02 Ensemble de feux arrière de véhicule WO2023012651A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202121034681 2021-08-02
IN202121034681 2021-08-02

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Publication Number Publication Date
WO2023012651A1 true WO2023012651A1 (fr) 2023-02-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5278731A (en) * 1992-09-10 1994-01-11 General Electric Company Fiber optic lighting system using conventional headlamp structures
JP2006260799A (ja) * 2005-03-15 2006-09-28 Koito Mfg Co Ltd 車両用前照灯
DE602004001128T2 (de) * 2004-04-21 2006-12-14 C.R.F. Società Consortile per Azioni, Orbassano Dünne, plattenförmige Kraftfahrzeugleuchte

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5278731A (en) * 1992-09-10 1994-01-11 General Electric Company Fiber optic lighting system using conventional headlamp structures
DE602004001128T2 (de) * 2004-04-21 2006-12-14 C.R.F. Società Consortile per Azioni, Orbassano Dünne, plattenförmige Kraftfahrzeugleuchte
JP2006260799A (ja) * 2005-03-15 2006-09-28 Koito Mfg Co Ltd 車両用前照灯

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