US20180345845A1 - Vehicle light assembly - Google Patents
Vehicle light assembly Download PDFInfo
- Publication number
- US20180345845A1 US20180345845A1 US15/612,210 US201715612210A US2018345845A1 US 20180345845 A1 US20180345845 A1 US 20180345845A1 US 201715612210 A US201715612210 A US 201715612210A US 2018345845 A1 US2018345845 A1 US 2018345845A1
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- United States
- Prior art keywords
- light source
- light
- vehicle
- light assembly
- assembly
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/0005—Devices preventing the lights from becoming dirty or damaged, e.g. protection grids or cleaning by air flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/0017—Devices integrating an element dedicated to another function
- B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/30—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating rear of vehicle, e.g. by means of reflecting surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/28—Cover glass
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- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/60—Heating of lighting devices, e.g. for demisting
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- F21S48/22—
-
- F21S48/34—
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
- F21V23/0435—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by remote control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
- F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
- F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
- F21V23/0485—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor sensing the physical interaction between a user and certain areas located on the lighting device, e.g. a touch sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
-
- F21V3/0481—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/10—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings
- F21V3/12—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings the coatings comprising photoluminescent substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/34—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
- B60Q2400/30—Daytime running lights [DRL], e.g. circuits or arrangements therefor
Definitions
- the present disclosure generally relates to vehicles, and more particularly, to vehicle light assemblies.
- Automotive vehicles are commonly equipped with various exterior lighting assemblies including vehicle headlights at the front of the vehicle and taillights at the rear of the vehicle.
- Vehicle exterior lighting assemblies typically include a light source disposed within a housing having an outer lens. Some assemblies experience moisture buildup on the inside of the lens. In addition, moisture in the form of snow and ice may accumulate on the outside of the lens in cold weather conditions.
- a vehicle light assembly includes a light source.
- a lens is positioned proximate the light source.
- a conductive circuitry is disposed on the lens and forms a capacitive sensor.
- a temperature sensor is configured to detect a temperature of the light source.
- a vehicle includes a vehicle light assembly including a light source.
- a lens is positioned proximate the light source.
- a conductive circuitry is disposed on the lens and forms a capacitive sensor.
- One or more wireless communication transceivers is configured to detect an electronic device proximate the light assembly.
- a method of illuminating a vehicle light assembly comprising: illuminating a light source at a first illumination, detecting a capacitive signal proximate the light source and illuminating the light source at a second illumination in response to the detection of the capacitive field.
- FIG. 1A is a side view of a photoluminescent structure rendered as a coating for use in an assembly according to one embodiment
- FIG. 1B is a top view of a photoluminescent structure rendered as a discrete particle according to one embodiment
- FIG. 1C is a side view of a plurality of photoluminescent structures rendered as discrete particles and incorporated into a separate structure;
- FIG. 2A is a front perspective view of a vehicle, according to at least one example
- FIG. 2B is a rear perspective view of the vehicle of FIG. 2A , according to at least one example;
- FIG. 3 is a cross-sectional view of one of a light assembly taken through line of FIG. 2A , according to at least one example;
- FIG. 4 is a schematic diagram of conductive circuitry formed on the lens, according to at least one example
- FIG. 5 is an exploded view of the conductive circuitry shown in FIG. 4 , according to at least one example;
- FIG. 6A is a cross-sectional view taken through line VIA-VIA of FIG. 4 , according to at least one example;
- FIG. 6B is a cross-sectional view taken through line VIB-VIB of FIG. 4 , according to at least one example;
- FIG. 7 is a block diagram illustrating controls for controlling the switching of the conductive circuitry, according to at least one example
- FIG. 8 is a graph illustrating signals generated by the capacitive sensor indicative of moisture on the lens
- FIG. 9 is a flow diagram illustrating a control routine for controlling the switching between the capacitive sensor and heater, according to at least one example.
- FIG. 10 is a flow diagram illustrating a light control routine for controlling the light assembly, according to at least one example.
- the term “and/or,” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
- the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
- relational terms such as first and second, top and bottom, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions.
- FIGS. 1A-1C various exemplary embodiments of photoluminescent structures 10 are shown, each capable of being coupled to a substrate 12 , which may correspond to a vehicle fixture or vehicle-related piece of equipment.
- the photoluminescent structure 10 is generally shown rendered as a coating (e.g., a film) that may be applied to a surface of the substrate 12 .
- the photoluminescent structure 10 is generally shown as a discrete particle capable of being integrated with a substrate 12 .
- the photoluminescent structure 10 is generally shown as a plurality of discrete particles that may be incorporated into a support medium 14 (e.g., a film) that may then be applied (as shown) or integrated with the substrate 12 .
- a support medium 14 e.g., a film
- a given photoluminescent structure 10 includes an energy conversion layer 16 that may include one or more sublayers, which are exemplarily shown through broken lines in FIGS. 1A and 1B .
- Each sublayer of the energy conversion layer 16 may include one or more photoluminescent materials 18 having energy converting elements with phosphorescent or fluorescent properties.
- Each photoluminescent material 18 may become excited upon receiving an excitation light 24 of a specific wavelength, thereby causing the light to undergo a conversion process. Under the principle of down conversion, the excitation light 24 is converted into a longer wavelength, converted light 26 , that is outputted from the photoluminescent structure 10 .
- the excitation light 24 is converted into a shorter wavelength light that is outputted from the photoluminescent structure 10 .
- the wavelengths of light may mix together and be expressed as a multicolor light.
- excitation light 24 Light emitted by the sun, ambient sources and/or a light source is referred to herein as solid arrows.
- converted light 26 light emitted from the photoluminescent structure 10
- outputted light The mixture of excitation light 24 and converted light 26 that may be emitted simultaneously is referred to herein as outputted light.
- the energy conversion layer 16 may be prepared by dispersing the photoluminescent material 18 in a polymer matrix to form a homogenous mixture using a variety of methods. Such methods may include preparing the energy conversion layer 16 from a formulation in a liquid carrier support medium 14 and coating the energy conversion layer 16 to a desired substrate 12 . The energy conversion layer 16 may be applied to a substrate 12 by painting, screen-printing, spraying, slot coating, dip coating, roller coating, and bar coating. Alternatively, the energy conversion layer 16 may be prepared by methods that do not use a liquid carrier support medium 14 .
- the energy conversion layer 16 may be rendered by dispersing the photoluminescent material 18 into a solid-state solution (homogenous mixture in a dry state) that may be incorporated in a polymer matrix, which may be formed by extrusion, injection molding, compression molding, calendaring, thermoforming, etc.
- the energy conversion layer 16 may then be integrated into a substrate 12 using any methods known to those skilled in the art.
- each sublayer may be sequentially coated to form the energy conversion layer 16 .
- the sublayers can be separately prepared and later laminated or embossed together to form the energy conversion layer 16 .
- the energy conversion layer 16 may be formed by coextruding the sublayers.
- the converted light 26 that has been down converted or up converted may be used to excite other photoluminescent material(s) 18 found in the energy conversion layer 16 .
- the process of using the converted light 26 outputted from one photoluminescent material 18 to excite another, and so on, is generally known as an energy cascade and may serve as an alternative for achieving various color expressions.
- the difference in wavelength between the excitation light 24 and the converted light 26 is known as the Stokes shift and serves as the principal driving mechanism for an energy conversion process corresponding to a change in wavelength of light.
- each of the photoluminescent structures 10 may operate under either conversion principle.
- the photoluminescent structure 10 may optionally include at least one stability layer 20 to protect the photoluminescent material 18 contained within the energy conversion layer 16 from photolytic and thermal degradation.
- the stability layer 20 may be configured as a separate layer optically coupled and adhered to the energy conversion layer 16 .
- the stability layer 20 may be integrated with the energy conversion layer 16 .
- the photoluminescent structure 10 may also optionally include a protective layer 22 optically coupled and adhered to the stability layer 20 or other layer (e.g., the conversion layer 16 in the absence of the stability layer 20 ) to protect the photoluminescent structure 10 from physical and chemical damage arising from environmental exposure.
- the stability layer 20 and/or the protective layer 22 may be combined with the energy conversion layer 16 through sequential coating or printing of each layer, sequential lamination or embossing, or any other suitable means.
- the photoluminescent material 18 may include organic or inorganic fluorescent dyes including rylenes, xanthenes, porphyrins, and phthalocyanines. Additionally, or alternatively, the photoluminescent material 18 may include phosphors from the group of Ce-doped garnets such as YAG:Ce and may be a short persistence photoluminescent material 18 . For example, an emission by Ce 3+ is based on an electronic energy transition from 4D 1 to 4f 1 as a parity allowed transition.
- the luminescent level of Ce 3+ has an ultra-short lifespan, or decay time, of 10 ⁇ 8 to 10 ⁇ 7 seconds (10 to 100 nanoseconds).
- the decay time may be defined as the time between the end of excitation from the excitation light 24 and the moment when the light intensity of the converted light 26 emitted from the photoluminescent structure 10 drops below a minimum visibility of 0.32 mcd/m 2 .
- a visibility of 0.32 mcd/m 2 is roughly 100 times the sensitivity of the dark-adapted human eye, which corresponds to a base level of illumination commonly used by persons of ordinary skill in the art.
- a Ce 3+ garnet may be utilized, which has a peak excitation spectrum that may reside in a shorter wavelength range than that of conventional YAG:Ce-type phosphors. Accordingly, Ce 3+ has short persistence characteristics such that its decay time may be 100 milliseconds or less. Therefore, in some embodiments, the rare earth aluminum garnet type Ce phosphor may serve as the photoluminescent material 18 with ultra-short persistence characteristics, which can emit the converted light 26 by absorbing purple to blue excitation light 24 emitted from a light source and/or ambient sources. According to one embodiment, a ZnS:Ag phosphor may be used to create a blue converted light 26 .
- a ZnS:Cu phosphor may be utilized to create a yellowish-green converted light 26 .
- a Y 2 O 2 S:Eu phosphor may be used to create red converted light 26 .
- the aforementioned phosphorescent materials may be combined to form a wide range of colors, including white light. It will be understood that any short persistence photoluminescent material known in the art may be utilized without departing from the teachings provided herein. Additional information regarding the production of short persistence photoluminescent materials is disclosed in U.S. Pat. No.
- the photoluminescent material 18 disposed within the photoluminescent structure 10 may include a long persistence photoluminescent material 18 that emits the converted light 26 , once charged by the excitation light 24 .
- the excitation light 24 may be emitted from any excitation source (e.g., any natural light source, such as the sun, and/or any artificial light source).
- the long persistence photoluminescent material 18 may be defined as having a long decay time due to its ability to store the excitation light 24 and release the converted light 26 gradually, for a period of several minutes or hours, once the excitation light 24 is no longer present.
- the long persistence photoluminescent material 18 may be operable to emit light at or above an intensity of 0.32 mcd/m 2 after a period of 10 minutes. Additionally, the long persistence photoluminescent material 18 may be operable to emit light above or at an intensity of 0.32 mcd/m 2 after a period of 30 minutes and, in some embodiments, for a period substantially longer than 60 minutes (e.g., the period may extend 24 hours or longer, and in some instances, the period may extend 48 hours). Accordingly, the long persistence photoluminescent material 18 may continually illuminate in response to excitation from any light sources that emit the excitation light 24 , including, but not limited to, natural light sources (e.g., the sun) and/or any artificial light source.
- any light sources that emit the excitation light 24 including, but not limited to, natural light sources (e.g., the sun) and/or any artificial light source.
- the periodic absorption of the excitation light 24 from any excitation source may provide for a substantially sustained charge of the long persistence photoluminescent material 18 to provide for consistent passive illumination.
- a light sensor may monitor the illumination intensity of the photoluminescent structure 10 and actuate an excitation source when the illumination intensity falls below 0.32 mcd/m 2 , or any other predefined intensity level.
- the long persistence photoluminescent material 18 may correspond to alkaline earth aluminates and silicates, for example doped di-silicates, or any other compound that is capable of emitting light for a period of time once the excitation light 24 is no longer present.
- the long persistence photoluminescent material 18 may be doped with one or more ions, which may correspond to rare earth elements, for example, Eu 2+ , Tb 3+ and/or Dy 3 .
- the photoluminescent structure 10 includes a phosphorescent material in the range of about 30% to about 55%, a liquid carrier medium in the range of about 25% to about 55%, a polymeric resin in the range of about 15% to about 35%, a stabilizing additive in the range of about 0.25% to about 20%, and performance-enhancing additives in the range of about 0% to about 5%, each based on the weight of the formulation.
- the photoluminescent structure 10 may be a translucent white color, and in some instances reflective, when unilluminated. Once the photoluminescent structure 10 receives the excitation light 24 of a particular wavelength, the photoluminescent structure 10 may emit any color light (e.g., blue or red) therefrom at any desired brightness.
- a blue-emitting phosphorescent material may have the structure Li 2 ZnGeO 4 and may be prepared by a high temperature solid-state reaction method or through any other practicable method and/or process. The afterglow may last for a duration of 2-8 hours and may originate from the excitation light 24 and d-d transitions of Mn 2+ ions.
- 100 parts of a commercial solvent-borne polyurethane such as Mace resin 107 - 268 , having 50% solids polyurethane in toluene/isopropanol, 125 parts of a blue-green long persistence phosphor, such as Performance Indicator PI-BG20, and 12.5 parts of a dye solution containing 0.1% Lumogen Yellow F083 in dioxolane may be blended to yield a low rare earth mineral photoluminescent structure 10 .
- a commercial solvent-borne polyurethane such as Mace resin 107 - 268 , having 50% solids polyurethane in toluene/isopropanol
- 125 parts of a blue-green long persistence phosphor such as Performance Indicator PI-BG20
- 12.5 parts of a dye solution containing 0.1% Lumogen Yellow F083 in dioxolane may be blended to yield a low rare earth mineral photoluminescent structure 10 .
- the compositions provided herein are non-limiting examples.
- a vehicle 30 is generally depicted.
- the vehicle 30 is depicted as a sports-utility vehicle, but it will be understood that the vehicle 30 may be a pickup truck, sedan, compact and/or other types of vehicles 30 without departing from the teachings provided herein.
- the vehicle 30 is shown having a plurality of light assemblies 34 positioned around the vehicle 30 .
- the light assemblies 34 may be headlights (e.g., FIG. 2A ), taillights (e.g., FIG. 2B ) and/or a variety of light assemblies 34 positioned around the vehicle 30 (e.g., running lights, reverse lights, brake lights, turn indicators, center high mount stop lamp, running board lights, etc.).
- the light assemblies 34 are configured to provide headlight illumination forward of the vehicle 30 .
- the light assemblies 34 are configured to provide taillight illumination generally rearward of the vehicle 30 .
- One or more of the light assemblies 34 may be configured to include conductive circuitry that provides moisture sensing and removal of the moisture from the respective lighting assemblies 34 .
- the conductive circuitry may also serve as a proximity sensor to detect the presence of a user or a touch by the user of the light assembly 34 .
- the light assembly 34 is shown having a housing 36 and an outer lens 38 connected to housing 36 .
- Housing 36 is generally fixed to the vehicle body in a conventional manner.
- the light source 40 may include one or more light emitting diodes (LEDs), incandescent bulbs, halogen bulbs, or other sources of light illumination.
- LEDs light emitting diodes
- the light source 40 may be positioned on a printed circuit board 46 .
- the printed circuit board (PCB) 46 may incorporate one or more temperature sensors 48 .
- the temperature sensor 48 may be a standalone device coupled to the PCB 46 , or may be part of an existing component (e.g., the built-in temperature sensor 48 may be built into a microprocessor on the PCB 46 ). As will be explained in greater detail below, the temperature sensor 48 may be configured to generally detect a temperature of the PCB 46 , the light source 40 , the light assembly 34 , and/or other components within and proximate the light assembly 34 .
- the reflector 42 is generally positioned to reflect light output from the light source 40 forward of the vehicle 30 through the inner lens 44 and outer lens 38 to illuminate a roadway generally forward of the vehicle 30 .
- the inner lens 44 and outer lens 38 may be made of a clear light transmissive polymeric material, glass material and/or combinations thereof.
- the light assembly 34 is configured as a headlight configured as a low beam light assembly, a high beam light assembly, and/or a combination of low and high light beam assemblies.
- the housing 36 and outer lens 38 may contain a plurality of light sources for multiple functions, such as headlight illumination, daylight running lamps, turn signals, flashers, and other lighting functions. It will be understood that although depicted as an exterior light, the light assembly 34 may be an interior light assembly 34 such as a map light, dome light, puddle light, trunk light and/or other light assemblies 34 positioned within an interior of the vehicle 30 .
- the vehicle light assembly 34 includes conductive circuitry 50 provided on the outer lens 38 for providing a capacitive sensor for moisture sensing and a heater for heating or defrost operations.
- the conductive circuitry 50 forms both a capacitive sensor for sensing moisture on the lens and a heater for removing the moisture.
- the conductive circuitry 50 is formed on the inside surface of the outer lens 38 , but it will be understood that the conductive circuitry 50 may otherwise be formed on the outside surface of the outer lens 38 and/or in an intermediate layer of the outer lens 38 .
- the photoluminescent structure 10 may be positioned on an interior and/or an exterior surface of the outer lens 38 .
- the photoluminescent structure 10 may be configured as an indicia such as alphanumeric text, numbers, symbols and/or pictures.
- the light source 40 may be configured to emit the excitation light to excite the photoluminescent structure 10 .
- the conductive circuitry 50 includes control circuitry for controlling the conductive circuitry 50 .
- the conductive circuitry 50 is made up of an electrically conductive material that allows electrical current and signals to be transmitted thereon.
- the conductive circuitry 50 includes a first electrode 52 having a first plurality of electrode fingers 54 shown extending between conductive lines 56 and 58 .
- the conductive circuitry 50 also includes a second electrode 60 having a second plurality of electrode fingers 62 that are electrically isolated or dielectrically isolated from the first plurality of electrode fingers 54 .
- the first and second plurality of electrode fingers 54 and 62 are interdigitated so as to form a capacitive coupling therebetween when configured as a capacitive sensor.
- a dielectric layer 64 is disposed between electrode fingers 62 and connecting line 58 to allow the signal lines to cross over without making electrical connections. As such, the second electrode 60 and corresponding electrode fingers 62 are dielectrically isolated from connecting line 58 and the first electrode 52 and corresponding electrode fingers 54 .
- Switching circuitry including a plurality of switches, shown as first switch SW 1 , second switch SW 2 , third switch SW 3 , and fourth switch SW 4 are illustrated connected to the conductive circuitry 50 to control switching of the conductive circuitry 50 between the capacitive sensor and heater operations.
- Each of the switches SW 1 -SW 4 may be controlled by control circuitry including a microprocessor 66 as shown.
- the first switch SW 1 connects the first electrode 52 via connecting line 56 to a defrost voltage source shown as V D .
- the fourth switch SW 4 is shown connecting the first electrode 52 via the connecting line 58 to ground.
- a defroster voltage V O is applied across the first electrode 52 from the first connecting line 56 across fingers 54 to the second connecting line 58 and to ground to cause electric current to flow therethrough and generate heat across the first electrode 52 to operate as a heater to defrost or defog the outer lens 38 .
- switches SW 2 and SW 3 are in the open position during the heater/defogger or defrost operation.
- electrical current passing through the first electrode 52 generates heat due to the electrical resistance of the circuit which forms a resistive heater for removing moisture from the outer lens 38 .
- Moisture may be in the form of humidity which is water vapor in the air, or may be in the form of condensation which is water on a surface which can be in the form of liquid water or frozen water (e.g., ice or frost).
- the conductive circuitry 50 may also be configured to operate in a sensing operation as a capacitive sensor to sense moisture on the outer lens 38 such as condensation on the inside or outside of the outer lens 38 or snow or ice on the outside of the outer lens 38 . Further, the conductive circuitry, when operating as the capacitive sensor, may be configured to detect a disturbance (e.g., a finger or other vehicle user's touch on or proximate the light assembly 34 ) in an activation field emitted, or created, by the conductive circuitry 50 . When moisture is sensed on the outer lens 38 (e.g., while the conductive circuitry 50 is operating as the capacitive sensor), the conductive circuitry 50 may be switched to the heater configuration to remove the sensed moisture.
- a disturbance e.g., a finger or other vehicle user's touch on or proximate the light assembly 34
- the conductive circuitry 50 is controlled by opening the first switch SW 1 and the fourth switch SW 4 and closing the second switch SW 2 and the third switch SW 3 .
- the microprocessor 66 is able to control drive and receive signals to and from the first and second electrodes 52 and 60 so as to generate a capacitive activation field for sensing moisture on the outer lens 38 .
- the capacitive sensor is configured to sense moisture, such as condensation on the interior surface of the outer lens 38 and humidity proximate to the interior surface of the lens 38 and water vapor on the outside of the lens 38 such as in the form of liquid or ice.
- the moisture is sensed by a change in the signal generated by the proximity sensor due to the moisture content in the air on the surface of the outer lens 38 .
- the conductive circuitry may be switched to the heater operation to remove the moisture.
- the housing 36 or lens 38 may have a moisture outlet such as a GoreTex® patch to allow heated moisture to exit the interior.
- the capacitive sensor employs the first electrode 52 as a drive electrode and the second electrode 60 as a receive electrode, each having interdigitated fingers 54 and 62 , respectively, for generating a capacitive field.
- the first electrode 52 receives square wave drive signal pulses applied at a voltage.
- the second electrode 60 has an output for generating an output voltage.
- the first and second electrodes 52 and 60 and corresponding electrode fingers 54 and 62 may be arranged in various configurations for generating the capacitive fields as the sense activation fields, according to various examples.
- the first and second electrodes 52 and 60 may otherwise be configured so that other types of single electrode sensors or other multiple electrode sensors may be used.
- the conductive circuitry 50 may be formed with conductive ink or may be alternatively formed with rigid or flexible circuitry that may be adhered or otherwise attached to the outer lens 38 .
- the first electrode 52 is supplied with an input voltage as square wave signal pulses having a charge pulse cycle sufficient to charge the second electrode 60 to a desired voltage.
- the second electrode 60 thereby serves as a measurement electrode.
- moisture such as humidity or condensation on the interior or exterior surface of the outer lens 38
- the moisture causes a disturbance in the activation field which generates a signal that is processed to determine the moisture level.
- the disturbance of the activation field is detected by processing the charge pulse signals.
- the conductive circuitry 50 may be formed with a film of indium tin oxide (ITO).
- ITO indium tin oxide
- the ITO forming the conductive circuitry 50 may be formed as an ink printed onto the interior surface of the outer lens 38 .
- the ITO may be deposited as a thin film onto the surface of the outer lens 38 and may have a thickness of about 1,000-3,000 angstroms to form a transparent electrical conductor.
- the ITO layer forming the conductive circuitry 50 is a substantially visually transparent medium that can be used to form the first and second electrodes 52 and 60 and other conductive signal lines for forming the proximity sensors and the heating elements. As such, the conductive circuitry 50 will remain substantially invisible to a user looking through the outer lens 38 .
- other transparent and semi-transparent or visible conductive inks or films may be used to form the conductive circuitry 50 .
- the first and second electrodes 52 and 60 and corresponding first and second plurality of conductive fingers 54 and 62 may be formed on the inside surface of the outer lens 38 .
- the first electrode 52 may be disposed on or adhered via an adhesive onto the inner surface of outer lens 38 .
- the second electrode 60 is also disposed onto the inner surface of outer lens 38 such that the second plurality of fingers 62 is interdigitated with the first plurality of fingers 54 .
- the dielectric layer 64 may be disposed between the first and second electrodes 52 and 60 on the inner surface of connecting line 58 such that the second electrode 60 and second plurality of conductive fingers 62 are separated from the first electrode 52 at that location as shown in FIG. 6B .
- the remainder of the first and second electrodes 52 and 60 and conductive fingers 54 and 62 may be substantially coplanar on the inner surface of the outer lens 38 as depicted in FIG. 6A . It will be understood that the dielectric layer 64 may be enlarged to cover substantially more or all of the surface area between the first and second electrodes.
- the conductive circuitry 50 is illustrated controlled by a controller 70 .
- the signals generated by the capacitive sensor input to the controller 70 .
- the controller 70 may include circuitry, such as the microprocessor 66 and a memory 72 .
- the control circuitry may include sense control circuitry for processing the activation field of the capacitive sensor to sense moisture proximate to the outer lens 38 and/or touching of the light assembly 34 . It will be understood that other analog and/or digital control circuitry may be employed to process the capacitive field signals to determine the presence of moisture buildup on the outer lens 38 and initiate defogging or moisture removal with activation of the heater operation as well as aid in the detection of touching of the light assembly 34 without departing from the teachings provided herein.
- the controller 70 may include an analog-to-digital (A/D) comparator integrated within or coupled to the microprocessor 66 and may receive voltage output from the capacitive sensor, convert the analog signal to a digital signal, and provide a digital signal to the microprocessor 66 .
- the controller 70 may include a pulse counter integrated within or coupled to the microprocessor 66 that counts the charge signal pulses that are applied to the drive electrode, performs a count of the pulses needed to charge the capacitor until the voltage output reaches a predetermined voltage, and provides the count to the microprocessor 66 .
- the pulse count is indicative of the change in capacitance of the capacitive signal.
- the controller 70 may provide a pulse width modulated signal to a pulse width modulated drive buffer to generate the square wave pulse which is applied to the drive electrode.
- the controller 70 may determine the moisture present at or proximate to the outer lens 38 and control the heater by controlling the switches SW 1 -SW 4 as outputs. As will be explained in greater detail below, the controller 70 may also regulate the electrical current applied to the light source 40 in response to activation of the capacitive sensor.
- the memory 72 may include a control routine 74 for controlling the switches to switch operation of the conductive circuitry 50 between the capacitive sensing operation mode and the heater operation mode, a location sensing routine 76 for determining the location of an electronic device 78 proximate the vehicle 30 , and a light control routine 80 for adjusting the intensity of light provided by the light source 40 based on a number of factors.
- the electronic device 78 may include a cellphone, a key FOB, wearable device (e.g., fitness band, watch, glasses, jewelry, wallet), apparel (e.g., a tee shirt, gloves, shoes or other accessories), personal digital assistant, headphones and/or other devices capable of wireless transmission (e.g., radio frequency, Bluetooth, ultrasonic).
- the change in signal charge pulse counts detected during various moisture conditions is shown as signals 82 A- 82 E.
- the change in signal 82 A- 82 E is a count value difference between an initialized reference count value for different levels of moisture present on the outer lens 38 .
- the moisture enters the activation field associated with the capacitive sensor and causes a disruption to the capacitance, thereby resulting in a raw signal increase as shown by signals 82 B- 82 E.
- Signal 82 A represents a clean lens having little or no moisture in which the signal 82 A is relatively low and steady.
- Signal 82 B shows the signal when sensing ice on the outside surface of the outer lens 38 which has a relatively high signal output.
- Signal 82 C shows the results of condensation formed on the outer lens 38 .
- Signal 82 D shows the effect of rain on the outer surface of the outer lens 38 .
- Signal 82 E shows a defogging signal pattern that shows the removal of moisture during the heater operation.
- routine 100 is illustrated for controlling the switches to switch operation of the conductive circuitry 50 between the capacitive sensing operation mode and the heater operation mode.
- Routine 74 begins at step 102 and proceeds to step 104 to open all switches SW 1 -SW 4 .
- step 106 the second and third switches SW 2 and SW 3 are closed. This places the conductive circuitry 50 into the capacitive sensor mode of operation.
- the capacitance is then measured at step 108 .
- routine 100 determines if de-icing is required based on the measured capacitance indicating that moisture has built up on the outer lens. De-icing may be required when there is sufficient condensation on the inside or outside of the lens or snow or ice on the outside of the lens.
- routine 74 returns to step 102 . If de-icing is required, routine 100 proceeds to step 112 to open the second and third switches SW 2 and SW 3 and then to step 114 to close the first and fourth switches SW 1 and SW 4 . This places the conductive circuitry 50 into the heater mode of operation. At this point, the heater operates to heat the outer lens 38 to remove some or all of the moisture from the outer lens 38 . Routine 100 proceeds to step 116 to wait for a time period (e.g., one minute, two minutes, etc.) to operate the heater before returning to step 102 . It will be appreciated that routine 100 may be repeated to cycle the conductive circuitry 50 between the capacitive sensing and heater modes of operation a predetermined number of times or if moisture is sensed again as present on the outer lens 38 .
- a time period e.g., one minute, two minutes, etc.
- the vehicle 30 is also equipped with one or more sensors for detecting if a person and the electronic device 78 ( FIG. 2B ) are near or proximate the vehicle 30 .
- the sensors may include wireless communication transceivers 150 .
- the vehicle 30 and/or light assembly 34 may include one or a plurality of wireless communication transceivers 150 and be configured to interact with the electronic device 78 .
- the wireless communication transceivers 150 may communicate with the electronic device 78 over a wireless signal (e.g., radio frequency).
- the wireless communication transceivers 150 may be a BluetoothTM RN4020 module, or an RN4020 BluetoothTM low energy PICtail board configured to communicate with the electronic device 78 using BluetoothTM low energy signals.
- the wireless communication transceivers 150 may include a transmitter and a receiver to transmit and receive wireless signals (e.g., BluetoothTM signals) to and from the electronic device 78 . It will be appreciated that the wireless communication transceivers 150 may utilize other forms of wireless communication between with the electronic device 78 and other wireless communication transceivers 150 such as Wi-FiTM without departing from the teachings provided herein.
- the wireless communication transceivers 150 may be positioned on or within the controller 70 .
- the wireless communication transceiver 150 is configured to communicate with the microprocessor 66 such that one or more of the routines stored in the memory 72 is activated.
- the electronic device 78 may include one or more routines which control the communication between the wireless communication transceiver 150 and the electronic device 78 .
- the phone may include one or more applications 154 configured to communicate with the wireless communication transceivers 150 .
- the wireless communication transceivers 150 are standalone devices that are not in communication with body control modules, electronic control modules, engine control modules and/or other features of the vehicle 30 .
- the wireless communication transceivers 150 may only be capable of communication with the controller 70 and the electronic device 78 .
- the wireless communication transceivers 150 may communicate with the body controller or other onboard controllers.
- the transceivers 150 may be in communication with one another or may mutually communicate with a master controller or module (e.g., body control module).
- the wireless communication transceivers 150 may be disposed within other accessories of the vehicle 30 , or may be standalone units.
- the electronic device 78 may communicate with all, some, or none of the wireless communication transceivers 150 as the electronic device 78 enters and exits the communication range of the transceivers 150 .
- Each of the wireless communication transceivers 150 may be aware of its location within the vehicle 30 and capable of sharing its location with the electronic device 78 .
- the wireless communication transceivers 150 are capable of communicating with the electronic device 78 such that the location of the electronic device 78 may be determined therefrom (e.g., based on signal strength and/or return time of the signal) or vice versa.
- the location sensing routine 76 in the memory 72 of the controller 70 may utilize the signal strength and time to return of the signals between the wireless communication transceivers 150 and the electronic device 78 to triangulate the position of the electronic device 78 as the person moves around and inside of the vehicle 30 .
- the wireless communication transceivers 150 communicate with a master module
- the location of the electronic device 78 may be calculated in the master module.
- the location of the electronic device 78 may have sufficient resolution to determine which seat within the vehicle 30 the user is approaching or sitting in. The electronic device 78 may then share its determined location with the wireless communication transceivers 150 such that appropriate features may be activated by the appropriate transceivers 150 . It will be understood that the location sensing routine 76 may be located on the electronic device 78 and that any location determinations may be made by the electronic device 78 and shared with the wireless communication transceivers 150 without departing from the teachings provided herein.
- Memory within the wireless communication transceivers 150 may store identifying information relating to electronic devices 78 which were detected within the vehicle 30 (e.g., using the location sensing routine 76 ) and which may therefore be generally regarded as “friendly,” registered and/or as the owner of the vehicle 30 .
- the wireless communication transceivers 150 detect the presence of an unknown electronic device 78 , detect a characteristic signal shift (e.g., attenuation or increase in signal at corresponding wireless communication transceivers 150 ) indicative of the unknown electronic device 78 entering or being within the vehicle 30 across multiple wireless communication transceivers 150 , and store characteristic information about the electronic device 78 for future identification. It will be understood that a determination of the location of the electronic device 78 to be within the vehicle 30 may also prompt a storing of the characteristic information about the electronic device 78 for future identification.
- a characteristic signal shift e.g., attenuation or increase in signal at corresponding wireless communication transceivers 150
- Utilizing the past and/or present location of the electronic device 78 as a security feature to determine if it is allowed access to the controller 70 may be particularly advantageous as the replication of signal shifting indicative of the electronic device 78 entering the vehicle 30 and the location of the electronic device 78 is particularly difficult to fake. Further, it will be understood that more conventional methods of connecting electronic devices 78 , such as pairing and manually connecting, may also be utilized to designate friendly devices 78 .
- the light control routine 80 may control the light assembly 34 in a variety of manners depending on detected properties of the electronic device 78 (e.g., known or unknown device, location, and user specific data) and/or signals from the temperature sensor 48 . For example, if a known or friendly electronic device 78 is detected near (e.g., within about 2 m) the rear of the vehicle 30 and the capacitive sensor detects a change in the activation field (i.e., indicative of a person in possession of the electronic device 78 touching or getting close to the light assembly 34 ), the light control routine 80 may be configured to alter an electrical current provided to the light source 40 to change intensity of illumination from the light source 40 (e.g., by overdriving the light source 40 ).
- detected properties of the electronic device 78 e.g., known or unknown device, location, and user specific data
- the light control routine 80 may be configured to alter an electrical current provided to the light source 40 to change intensity of illumination from the light source 40 (e.g., by overdriving the
- the light control routine 80 may begin with a step 170 ( FIG. 10 ) of illuminating the light source 40 at a first illumination.
- the first illumination may be a standard illumination or the light source 40 may be off.
- a step 174 of detecting a capacitive signal proximate the light source 40 is performed.
- the capacitive signal may be the detection of a change of the activation field by the capacitive sensor. As explained above, this capacitive signal may be the touch of a user of the light assembly 34 .
- a step 178 of illuminating the light source 40 at a second illumination in response to the detection of the capacitive signal may be carried out.
- the second illumination may be higher or lower relative to the first illumination.
- the light control routine 80 may be advantageous in allowing the light of the light assembly 34 to be altered in real time by a person proximate the light assembly 34 .
- a person located proximate the light assembly 34 may touch the light assembly 34 in order to change (e.g., increase or decrease) the illumination of the light assembly 34 .
- Such a feature may be advantageous in allowing the person to increase the illumination if they are working behind the vehicle 30 or to decrease the illumination if the lights are too bright.
- the person may touch the light assembly 34 multiple times to cycle though various illuminations provided by the light assembly 34 . Further, the cycling of various illuminations may be carried out through use of the application 154 on the electronic device 78 .
- each light assembly 34 may be individually controlled and/or touching one light assembly 34 may increase or decrease the illumination from all light assemblies 34 . It will be understood that touching the light assembly 34 may further activate the light source 40 to emit excitation light 24 which excites the photoluminescent structure.
- the light control routine 80 may only be activated while detection of a friendly electronic device 78 is proximate the vehicle 30 . Such a feature may be advantageous in decreasing the risk of unknown people adjusting the illumination provided by the light assembly 34 and potentially depleting the battery of the vehicle 30 .
- the light control routine 80 may further be run with sensor data from the temperature sensor 48 .
- the light control routine 80 may further include a step 182 of detecting a temperature of the light source 40 and a step 186 of illuminating the light source 40 at a third illumination in response to the detection of the light source temperature.
- the third illumination may be less than or greater than the first and/or second illuminations.
- Thermal management e.g., the expulsion or getting rid of heat
- the light source 40 is important in maintaining an even and consistent illumination; however, the maximum operating temperature assumption for the light source 40 (e.g., about 167° F.-221° F. for an LED on a PCB) is not accurate most of the time.
- the temperature sensor 48 may be configured to reduce an electrical power to the light source 40 in response to a detected temperature of the light source 40 .
- the third illumination may be greater than the first and/or second illuminations.
- the light assembly 34 and/or light source 40 may be able to output an increased illumination in the second illumination compared to the first illumination (e.g., two or three times greater) for as long as can be sustained without causing permanent damage to the light source 40 .
- detection of the location of the electronic device 78 may allow for the light assembly 34 to change where light is projected to using optics and/or by altering which light source 40 is activated. For example, as the electronic device 78 is detected moving away or toward the vehicle 30 , the optics may adjust the direction of the light from the light assembly 34 to follow the electronic device 78 .
- detection of location of the electronic device 78 relative to the vehicle 30 also permits the wireless communication transceivers 150 to determine if an unrecognized electronic device 78 is proximate the vehicle 30 .
- an unrecognized electronic device 78 may be owned or carried by a potential burglar or threat to the vehicle 30 .
- the wireless communication transceivers 150 and/or controller 70 may activate one or more counter measures. Countermeasures may include a strobe light from the light assembly 34 or directing light from the assembly 34 at the electronic device 78 .
- any available identifying information about the electronic device 70 may be stored for later retrieval if the owner of the vehicle's electronic device 78 is not detected proximate the vehicle 30 at the same time.
- changing the illumination of the light assembly 34 may provide wide coverage behind the vehicle 30 with bright task lighting which may be advantageous for camp site set-up, work sites, etc.
- changing the illumination of the light assembly 34 in brake light examples, may provide light for camp sites and other outdoor activities. The benefit of the red light is that it does not attract bugs and preserves night vision.
- changing the illumination of the light assembly 34 in license plate light examples, may provide a direct stream of light downward in the area of a trailer hitch and the ground directly behind the vehicle 30 .
- headlight examples of the light assembly 34 which typically put out large amounts of illumination, may be dimmed to be used as work lights.
- the present disclosure allows a key fob or recent occupant's electronic device to function as an authorization method to control who can control the light assembly 34 .
- the light control routine 80 may turn off the light assembly 34 at about 50% battery charge with to protect battery life of the vehicle 30 .
- use of the wireless communication transceivers 150 allows for the light assembly 34 to be activated as a person approaches or leaves (e.g., to activate welcome or farewell lighting).
- use of the wireless communication transceivers 150 allows for a low consumption of power from the vehicle 30 while the driver or passengers are away from the vehicle 30 .
- photoluminescent structure 10 on the outer lens 38 , in conjunction with the conductive circuitry 50 allows a user of the vehicle 30 to tap the light assembly 34 to excite the photoluminescent structure 10 . It will be understood that the photoluminescent structure 10 may be excited regardless of whether the light assembly 34 is emitting visible light.
- a vehicle light assembly includes a light source, a lens positioned proximate the light source, a conductive circuitry disposed on the lens and forming a capacitive sensor, and a temperature sensor configured to detect a temperature of the light source.
- Embodiments of the vehicle can include any one or a combination of the following features:
- a method of illuminating a vehicle light assembly includes the steps: illuminating a light source at a first illumination; detecting a capacitive signal proximate the light source; and illuminating the light source at a second illumination in response to the detection of the capacitive field.
- Embodiments of the method can include any one or a combination of the following steps and features:
- the term “coupled” in all of its forms: couple, coupling, coupled, etc. generally means the joining of two components (electrical or mechanical) directly or indirectly to one another. Such joining may be stationary in nature or movable in nature. Such joining may be achieved with the two components (electrical or mechanical) and any additional intermediate members being integrally formed as a single unitary body with one another or with the two components. Such joining may be permanent in nature, or may be removable or releasable in nature, unless otherwise stated.
- the term “about” means that amounts, sizes, formulations, parameters, and other quantities and characteristics are not and need not be exact, but may be approximate and/or larger or smaller, as desired, reflecting tolerances, conversion factors, rounding off, measurement error and the like, and other factors known to those of skill in the art.
- the term “about” is used in describing a value or an end-point of a range, the disclosure should be understood to include the specific value or end-point referred to.
- substantially is intended to note that a described feature is equal or approximately equal to a value or description.
- a “substantially planar” surface is intended to denote a surface that is planar or approximately planar.
- substantially is intended to denote that two values are equal or approximately equal. In some embodiments, “substantially” may denote values within about 10% of each other, such as within about 5% of each other, or within about 2% of each other.
- the terms “the,” “a,” or “an,” mean “at least one,” and should not be limited to “only one” unless explicitly indicated to the contrary.
- reference to “a component” includes embodiments having two or more such components unless the context clearly indicates otherwise.
Abstract
A vehicle light assembly includes a light source. A lens is positioned proximate the light source. A conductive circuitry is disposed on the lens and forms a capacitive sensor. A temperature sensor is configured to detect a temperature of the light source.
Description
- The present disclosure generally relates to vehicles, and more particularly, to vehicle light assemblies.
- Automotive vehicles are commonly equipped with various exterior lighting assemblies including vehicle headlights at the front of the vehicle and taillights at the rear of the vehicle. Vehicle exterior lighting assemblies typically include a light source disposed within a housing having an outer lens. Some assemblies experience moisture buildup on the inside of the lens. In addition, moisture in the form of snow and ice may accumulate on the outside of the lens in cold weather conditions.
- According to one aspect of the present disclosure, a vehicle light assembly includes a light source. A lens is positioned proximate the light source. A conductive circuitry is disposed on the lens and forms a capacitive sensor. A temperature sensor is configured to detect a temperature of the light source.
- According to another aspect of the present disclosure, a vehicle includes a vehicle light assembly including a light source. A lens is positioned proximate the light source. A conductive circuitry is disposed on the lens and forms a capacitive sensor. One or more wireless communication transceivers is configured to detect an electronic device proximate the light assembly.
- According to yet another aspect of the present disclosure, a method of illuminating a vehicle light assembly, comprising: illuminating a light source at a first illumination, detecting a capacitive signal proximate the light source and illuminating the light source at a second illumination in response to the detection of the capacitive field.
- These and other aspects, objects, and features of the present disclosure will be understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.
- The following is a description of the figures in the accompanying drawings. The figures are not necessarily to scale, and certain features and certain views of the figures may be shown exaggerated in scale or in schematic in the interest of clarity and conciseness.
- In the drawings:
-
FIG. 1A is a side view of a photoluminescent structure rendered as a coating for use in an assembly according to one embodiment; -
FIG. 1B is a top view of a photoluminescent structure rendered as a discrete particle according to one embodiment; -
FIG. 1C is a side view of a plurality of photoluminescent structures rendered as discrete particles and incorporated into a separate structure; -
FIG. 2A is a front perspective view of a vehicle, according to at least one example; -
FIG. 2B is a rear perspective view of the vehicle ofFIG. 2A , according to at least one example; -
FIG. 3 is a cross-sectional view of one of a light assembly taken through line ofFIG. 2A , according to at least one example; -
FIG. 4 is a schematic diagram of conductive circuitry formed on the lens, according to at least one example; -
FIG. 5 is an exploded view of the conductive circuitry shown inFIG. 4 , according to at least one example; -
FIG. 6A is a cross-sectional view taken through line VIA-VIA ofFIG. 4 , according to at least one example; -
FIG. 6B is a cross-sectional view taken through line VIB-VIB ofFIG. 4 , according to at least one example; -
FIG. 7 is a block diagram illustrating controls for controlling the switching of the conductive circuitry, according to at least one example; -
FIG. 8 is a graph illustrating signals generated by the capacitive sensor indicative of moisture on the lens; -
FIG. 9 is a flow diagram illustrating a control routine for controlling the switching between the capacitive sensor and heater, according to at least one example; and -
FIG. 10 is a flow diagram illustrating a light control routine for controlling the light assembly, according to at least one example. - Additional features and advantages of the invention will be set forth in the detailed description which follows and will be apparent to those skilled in the art from the description, or recognized by practicing the invention as described in the following description, together with the claims and appended drawings.
- As used herein, the term “and/or,” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components A, B, and/or C, the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
- In this document, relational terms, such as first and second, top and bottom, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions.
- Referring to
FIGS. 1A-1C , various exemplary embodiments ofphotoluminescent structures 10 are shown, each capable of being coupled to asubstrate 12, which may correspond to a vehicle fixture or vehicle-related piece of equipment. InFIG. 1A , thephotoluminescent structure 10 is generally shown rendered as a coating (e.g., a film) that may be applied to a surface of thesubstrate 12. InFIG. 1B , thephotoluminescent structure 10 is generally shown as a discrete particle capable of being integrated with asubstrate 12. InFIG. 1C , thephotoluminescent structure 10 is generally shown as a plurality of discrete particles that may be incorporated into a support medium 14 (e.g., a film) that may then be applied (as shown) or integrated with thesubstrate 12. - At the most basic level, a given
photoluminescent structure 10 includes anenergy conversion layer 16 that may include one or more sublayers, which are exemplarily shown through broken lines inFIGS. 1A and 1B . Each sublayer of theenergy conversion layer 16 may include one or morephotoluminescent materials 18 having energy converting elements with phosphorescent or fluorescent properties. Eachphotoluminescent material 18 may become excited upon receiving anexcitation light 24 of a specific wavelength, thereby causing the light to undergo a conversion process. Under the principle of down conversion, theexcitation light 24 is converted into a longer wavelength, convertedlight 26, that is outputted from thephotoluminescent structure 10. Conversely, under the principle of up conversion, theexcitation light 24 is converted into a shorter wavelength light that is outputted from thephotoluminescent structure 10. When multiple distinct wavelengths of light are outputted from thephotoluminescent structure 10 at the same time, the wavelengths of light may mix together and be expressed as a multicolor light. - Light emitted by the sun, ambient sources and/or a light source is referred to herein as
excitation light 24 and is illustrated herein as solid arrows. In contrast, light emitted from thephotoluminescent structure 10 is referred to herein as convertedlight 26 and is illustrated herein as broken arrows. The mixture ofexcitation light 24 and converted light 26 that may be emitted simultaneously is referred to herein as outputted light. - The
energy conversion layer 16 may be prepared by dispersing thephotoluminescent material 18 in a polymer matrix to form a homogenous mixture using a variety of methods. Such methods may include preparing theenergy conversion layer 16 from a formulation in a liquidcarrier support medium 14 and coating theenergy conversion layer 16 to a desiredsubstrate 12. Theenergy conversion layer 16 may be applied to asubstrate 12 by painting, screen-printing, spraying, slot coating, dip coating, roller coating, and bar coating. Alternatively, theenergy conversion layer 16 may be prepared by methods that do not use a liquidcarrier support medium 14. For example, theenergy conversion layer 16 may be rendered by dispersing thephotoluminescent material 18 into a solid-state solution (homogenous mixture in a dry state) that may be incorporated in a polymer matrix, which may be formed by extrusion, injection molding, compression molding, calendaring, thermoforming, etc. Theenergy conversion layer 16 may then be integrated into asubstrate 12 using any methods known to those skilled in the art. When theenergy conversion layer 16 includes sublayers, each sublayer may be sequentially coated to form theenergy conversion layer 16. Alternatively, the sublayers can be separately prepared and later laminated or embossed together to form theenergy conversion layer 16. Alternatively still, theenergy conversion layer 16 may be formed by coextruding the sublayers. - In some examples, the converted light 26 that has been down converted or up converted may be used to excite other photoluminescent material(s) 18 found in the
energy conversion layer 16. The process of using the converted light 26 outputted from onephotoluminescent material 18 to excite another, and so on, is generally known as an energy cascade and may serve as an alternative for achieving various color expressions. With respect to either conversion principle, the difference in wavelength between theexcitation light 24 and the convertedlight 26 is known as the Stokes shift and serves as the principal driving mechanism for an energy conversion process corresponding to a change in wavelength of light. In the various embodiments discussed herein, each of thephotoluminescent structures 10 may operate under either conversion principle. - Referring back to
FIGS. 1A and 1B , thephotoluminescent structure 10 may optionally include at least onestability layer 20 to protect thephotoluminescent material 18 contained within theenergy conversion layer 16 from photolytic and thermal degradation. Thestability layer 20 may be configured as a separate layer optically coupled and adhered to theenergy conversion layer 16. Alternatively, thestability layer 20 may be integrated with theenergy conversion layer 16. Thephotoluminescent structure 10 may also optionally include aprotective layer 22 optically coupled and adhered to thestability layer 20 or other layer (e.g., theconversion layer 16 in the absence of the stability layer 20) to protect thephotoluminescent structure 10 from physical and chemical damage arising from environmental exposure. Thestability layer 20 and/or theprotective layer 22 may be combined with theenergy conversion layer 16 through sequential coating or printing of each layer, sequential lamination or embossing, or any other suitable means. - Additional information regarding the construction of
photoluminescent structures 10 is disclosed in U.S. Pat. No. 8,232,533 to Kingsley et al., entitled “PHOTOLYTICALLY AND ENVIRONMENTALLY STABLE MULTILAYER STRUCTURE FOR HIGH EFFICIENCY ELECTROMAGNETIC ENERGY CONVERSION AND SUSTAINED SECONDARY EMISSION,” the entire disclosure of which is incorporated herein by reference. For additional information regarding fabrication and utilization of photoluminescent materials to achieve various light emissions, refer to U.S. Pat. No. 8,207,511 to Bortz et al., entitled “PHOTOLUMINESCENT FIBERS, COMPOSITIONS AND FABRICS MADE THEREFROM”; U.S. Pat. No. 8,247,761 to Agrawal et al., entitled “PHOTOLUMINESCENT MARKINGS WITH FUNCTIONAL OVERLAYERS”; U.S. Pat. No. 8,519,359 to Kingsley et al., entitled “PHOTOLYTICALLY AND ENVIRONMENTALLY STABLE MULTILAYER STRUCTURE FOR HIGH EFFICIENCY ELECTROMAGNETIC ENERGY CONVERSION AND SUSTAINED SECONDARY EMISSION”; U.S. Pat. No. 8,664,624 to Kingsley et al., entitled “ILLUMINATION DELIVERY SYSTEM FOR GENERATING SUSTAINED SECONDARY EMISSION”; U.S. Patent Publication No. 2012/0183677 to Agrawal et al., entitled “PHOTOLUMINESCENT COMPOSITIONS, METHODS OF MANUFACTURE AND NOVEL USES”; U.S. Pat. No. 9,057,021 to Kingsley et al., entitled “PHOTOLUMINESCENT OBJECTS”; and U.S. Pat. No. 8,846,184 to Agrawal et al., entitled “CHROMIC LUMINESCENT OBJECTS,” all of which are incorporated herein by reference in their entirety. - According to one embodiment, the
photoluminescent material 18 may include organic or inorganic fluorescent dyes including rylenes, xanthenes, porphyrins, and phthalocyanines. Additionally, or alternatively, thephotoluminescent material 18 may include phosphors from the group of Ce-doped garnets such as YAG:Ce and may be a shortpersistence photoluminescent material 18. For example, an emission by Ce3+ is based on an electronic energy transition from 4D1 to 4f1 as a parity allowed transition. As a result of this, a difference in energy between the light absorption and the light emission by Ce3+ is small, and the luminescent level of Ce3+ has an ultra-short lifespan, or decay time, of 10−8 to 10−7 seconds (10 to 100 nanoseconds). The decay time may be defined as the time between the end of excitation from theexcitation light 24 and the moment when the light intensity of the converted light 26 emitted from thephotoluminescent structure 10 drops below a minimum visibility of 0.32 mcd/m2. A visibility of 0.32 mcd/m2 is roughly 100 times the sensitivity of the dark-adapted human eye, which corresponds to a base level of illumination commonly used by persons of ordinary skill in the art. - According to one embodiment, a Ce3+ garnet may be utilized, which has a peak excitation spectrum that may reside in a shorter wavelength range than that of conventional YAG:Ce-type phosphors. Accordingly, Ce3+ has short persistence characteristics such that its decay time may be 100 milliseconds or less. Therefore, in some embodiments, the rare earth aluminum garnet type Ce phosphor may serve as the
photoluminescent material 18 with ultra-short persistence characteristics, which can emit the converted light 26 by absorbing purple toblue excitation light 24 emitted from a light source and/or ambient sources. According to one embodiment, a ZnS:Ag phosphor may be used to create a blue convertedlight 26. A ZnS:Cu phosphor may be utilized to create a yellowish-green converted light 26. A Y2O2S:Eu phosphor may be used to create red converted light 26. Moreover, the aforementioned phosphorescent materials may be combined to form a wide range of colors, including white light. It will be understood that any short persistence photoluminescent material known in the art may be utilized without departing from the teachings provided herein. Additional information regarding the production of short persistence photoluminescent materials is disclosed in U.S. Pat. No. 8,163,201 to Agrawal et al., entitled “PHOTOLYTICALLY AND ENVIRONMENTALLY STABLE MULTILAYER STRUCTURE FOR HIGH EFFICIENCY ELECTROMAGNETIC ENERGY CONVERSION AND SUSTAINED SECONDARY EMISSION,” the entire disclosure of which is incorporated herein by reference. - Additionally, or alternatively, the
photoluminescent material 18, according to one embodiment, disposed within thephotoluminescent structure 10 may include a longpersistence photoluminescent material 18 that emits the convertedlight 26, once charged by theexcitation light 24. Theexcitation light 24 may be emitted from any excitation source (e.g., any natural light source, such as the sun, and/or any artificial light source). The longpersistence photoluminescent material 18 may be defined as having a long decay time due to its ability to store theexcitation light 24 and release the converted light 26 gradually, for a period of several minutes or hours, once theexcitation light 24 is no longer present. - The long
persistence photoluminescent material 18, according to one embodiment, may be operable to emit light at or above an intensity of 0.32 mcd/m2 after a period of 10 minutes. Additionally, the longpersistence photoluminescent material 18 may be operable to emit light above or at an intensity of 0.32 mcd/m2 after a period of 30 minutes and, in some embodiments, for a period substantially longer than 60 minutes (e.g., the period may extend 24 hours or longer, and in some instances, the period may extend 48 hours). Accordingly, the longpersistence photoluminescent material 18 may continually illuminate in response to excitation from any light sources that emit theexcitation light 24, including, but not limited to, natural light sources (e.g., the sun) and/or any artificial light source. The periodic absorption of theexcitation light 24 from any excitation source may provide for a substantially sustained charge of the longpersistence photoluminescent material 18 to provide for consistent passive illumination. In some embodiments, a light sensor may monitor the illumination intensity of thephotoluminescent structure 10 and actuate an excitation source when the illumination intensity falls below 0.32 mcd/m2, or any other predefined intensity level. - The long
persistence photoluminescent material 18 may correspond to alkaline earth aluminates and silicates, for example doped di-silicates, or any other compound that is capable of emitting light for a period of time once theexcitation light 24 is no longer present. The longpersistence photoluminescent material 18 may be doped with one or more ions, which may correspond to rare earth elements, for example, Eu2+, Tb3+ and/or Dy3. According to one non-limiting exemplary embodiment, thephotoluminescent structure 10 includes a phosphorescent material in the range of about 30% to about 55%, a liquid carrier medium in the range of about 25% to about 55%, a polymeric resin in the range of about 15% to about 35%, a stabilizing additive in the range of about 0.25% to about 20%, and performance-enhancing additives in the range of about 0% to about 5%, each based on the weight of the formulation. - The
photoluminescent structure 10, according to one embodiment, may be a translucent white color, and in some instances reflective, when unilluminated. Once thephotoluminescent structure 10 receives theexcitation light 24 of a particular wavelength, thephotoluminescent structure 10 may emit any color light (e.g., blue or red) therefrom at any desired brightness. According to one embodiment, a blue-emitting phosphorescent material may have the structure Li2ZnGeO4 and may be prepared by a high temperature solid-state reaction method or through any other practicable method and/or process. The afterglow may last for a duration of 2-8 hours and may originate from theexcitation light 24 and d-d transitions of Mn2+ ions. - According to an alternate non-limiting exemplary embodiment, 100 parts of a commercial solvent-borne polyurethane, such as Mace resin 107-268, having 50% solids polyurethane in toluene/isopropanol, 125 parts of a blue-green long persistence phosphor, such as Performance Indicator PI-BG20, and 12.5 parts of a dye solution containing 0.1% Lumogen Yellow F083 in dioxolane may be blended to yield a low rare earth
mineral photoluminescent structure 10. It will be understood that the compositions provided herein are non-limiting examples. Thus, any phosphor known in the art may be utilized within thephotoluminescent structure 10 without departing from the teachings provided herein. Moreover, it is contemplated that any long persistence phosphor known in the art may also be utilized without departing from the teachings provided herein. - Additional information regarding the production of long persistence photoluminescent materials is disclosed in U.S. Pat. No. 8,163,201 to Agrawal et al., entitled “HIGH-INTENSITY, PERSISTENT PHOTOLUMINESCENT FORMULATIONS AND OBJECTS, AND METHODS FOR CREATING THE SAME,” the entire disclosure of which is incorporated herein by reference. For additional information regarding long persistence phosphorescent structures, refer to U.S. Pat. No. 6,953,536 to Yen et al., entitled “LONG PERSISTENT PHOSPHORS AND PERSISTENT ENERGY TRANSFER TECHNIQUE”; U.S. Pat. No. 6,117,362 to Yen et al., entitled “LONG-PERSISTENT BLUE PHOSPHORS”; and U.S. Pat. No. 8,952,341 to Kingsley et al., entitled “LOW RARE EARTH MINERAL PHOTOLUMINESCENT COMPOSITIONS AND STRUCTURES FOR GENERATING LONG-PERSISTENT LUMINESCENCE,” all of which are incorporated herein by reference in their entirety.
- Referring now to
FIGS. 2A and 2B , avehicle 30 is generally depicted. Thevehicle 30 is depicted as a sports-utility vehicle, but it will be understood that thevehicle 30 may be a pickup truck, sedan, compact and/or other types ofvehicles 30 without departing from the teachings provided herein. Thevehicle 30 is shown having a plurality oflight assemblies 34 positioned around thevehicle 30. For example, thelight assemblies 34 may be headlights (e.g.,FIG. 2A ), taillights (e.g.,FIG. 2B ) and/or a variety oflight assemblies 34 positioned around the vehicle 30 (e.g., running lights, reverse lights, brake lights, turn indicators, center high mount stop lamp, running board lights, etc.). In headlight examples of thelight assemblies 34, thelight assemblies 34 are configured to provide headlight illumination forward of thevehicle 30. In taillight examples, thelight assemblies 34 are configured to provide taillight illumination generally rearward of thevehicle 30. One or more of thelight assemblies 34 may be configured to include conductive circuitry that provides moisture sensing and removal of the moisture from therespective lighting assemblies 34. As will be explained in greater detail below, the conductive circuitry may also serve as a proximity sensor to detect the presence of a user or a touch by the user of thelight assembly 34. - Referring to
FIG. 3 , thelight assembly 34 is shown having ahousing 36 and anouter lens 38 connected tohousing 36.Housing 36 is generally fixed to the vehicle body in a conventional manner. Disposed within thehousing 36 andouter lens 38 is alight source 40, areflector 42, and aninner lens 44. Thelight source 40 may include one or more light emitting diodes (LEDs), incandescent bulbs, halogen bulbs, or other sources of light illumination. In LED examples of thelight source 40, thelight source 40 may be positioned on a printedcircuit board 46. The printed circuit board (PCB) 46 may incorporate one ormore temperature sensors 48. Thetemperature sensor 48 may be a standalone device coupled to thePCB 46, or may be part of an existing component (e.g., the built-intemperature sensor 48 may be built into a microprocessor on the PCB 46). As will be explained in greater detail below, thetemperature sensor 48 may be configured to generally detect a temperature of thePCB 46, thelight source 40, thelight assembly 34, and/or other components within and proximate thelight assembly 34. - The
reflector 42 is generally positioned to reflect light output from thelight source 40 forward of thevehicle 30 through theinner lens 44 andouter lens 38 to illuminate a roadway generally forward of thevehicle 30. Theinner lens 44 andouter lens 38 may be made of a clear light transmissive polymeric material, glass material and/or combinations thereof. In the depicted example, thelight assembly 34 is configured as a headlight configured as a low beam light assembly, a high beam light assembly, and/or a combination of low and high light beam assemblies. Additionally, thehousing 36 andouter lens 38 may contain a plurality of light sources for multiple functions, such as headlight illumination, daylight running lamps, turn signals, flashers, and other lighting functions. It will be understood that although depicted as an exterior light, thelight assembly 34 may be an interiorlight assembly 34 such as a map light, dome light, puddle light, trunk light and/or otherlight assemblies 34 positioned within an interior of thevehicle 30. - The vehicle
light assembly 34 includesconductive circuitry 50 provided on theouter lens 38 for providing a capacitive sensor for moisture sensing and a heater for heating or defrost operations. Theconductive circuitry 50 forms both a capacitive sensor for sensing moisture on the lens and a heater for removing the moisture. In the depicted example, theconductive circuitry 50 is formed on the inside surface of theouter lens 38, but it will be understood that theconductive circuitry 50 may otherwise be formed on the outside surface of theouter lens 38 and/or in an intermediate layer of theouter lens 38. - The
photoluminescent structure 10 may be positioned on an interior and/or an exterior surface of theouter lens 38. Thephotoluminescent structure 10 may be configured as an indicia such as alphanumeric text, numbers, symbols and/or pictures. As will be explained in greater detail below, thelight source 40 may be configured to emit the excitation light to excite thephotoluminescent structure 10. - Referring now to
FIGS. 4-6B , theconductive circuitry 50 includes control circuitry for controlling theconductive circuitry 50. Theconductive circuitry 50 is made up of an electrically conductive material that allows electrical current and signals to be transmitted thereon. Theconductive circuitry 50 includes afirst electrode 52 having a first plurality ofelectrode fingers 54 shown extending betweenconductive lines conductive circuitry 50 also includes asecond electrode 60 having a second plurality ofelectrode fingers 62 that are electrically isolated or dielectrically isolated from the first plurality ofelectrode fingers 54. The first and second plurality ofelectrode fingers dielectric layer 64 is disposed betweenelectrode fingers 62 and connectingline 58 to allow the signal lines to cross over without making electrical connections. As such, thesecond electrode 60 andcorresponding electrode fingers 62 are dielectrically isolated from connectingline 58 and thefirst electrode 52 andcorresponding electrode fingers 54. - Switching circuitry including a plurality of switches, shown as first switch SW1, second switch SW2, third switch SW3, and fourth switch SW4 are illustrated connected to the
conductive circuitry 50 to control switching of theconductive circuitry 50 between the capacitive sensor and heater operations. Each of the switches SW1-SW4 may be controlled by control circuitry including amicroprocessor 66 as shown. The first switch SW1 connects thefirst electrode 52 via connectingline 56 to a defrost voltage source shown as VD. The fourth switch SW4 is shown connecting thefirst electrode 52 via the connectingline 58 to ground. As such, when the first switch SW1 and fourth switch SW4 are in the closed positions for the heater operation, a defroster voltage VO is applied across thefirst electrode 52 from the first connectingline 56 acrossfingers 54 to the second connectingline 58 and to ground to cause electric current to flow therethrough and generate heat across thefirst electrode 52 to operate as a heater to defrost or defog theouter lens 38. At the same time, switches SW2 and SW3 are in the open position during the heater/defogger or defrost operation. It will be understood that electrical current passing through thefirst electrode 52 generates heat due to the electrical resistance of the circuit which forms a resistive heater for removing moisture from theouter lens 38. Moisture may be in the form of humidity which is water vapor in the air, or may be in the form of condensation which is water on a surface which can be in the form of liquid water or frozen water (e.g., ice or frost). - The
conductive circuitry 50 may also be configured to operate in a sensing operation as a capacitive sensor to sense moisture on theouter lens 38 such as condensation on the inside or outside of theouter lens 38 or snow or ice on the outside of theouter lens 38. Further, the conductive circuitry, when operating as the capacitive sensor, may be configured to detect a disturbance (e.g., a finger or other vehicle user's touch on or proximate the light assembly 34) in an activation field emitted, or created, by theconductive circuitry 50. When moisture is sensed on the outer lens 38 (e.g., while theconductive circuitry 50 is operating as the capacitive sensor), theconductive circuitry 50 may be switched to the heater configuration to remove the sensed moisture. In order to operate as a capacitive sensor, theconductive circuitry 50 is controlled by opening the first switch SW1 and the fourth switch SW4 and closing the second switch SW2 and the third switch SW3. With the first and fourth switches SW1 and SW4 open, electrical power from the defrost voltage is removed and with the second and third switches SW2 and SW3 closed, themicroprocessor 66 is able to control drive and receive signals to and from the first andsecond electrodes outer lens 38. The capacitive sensor is configured to sense moisture, such as condensation on the interior surface of theouter lens 38 and humidity proximate to the interior surface of thelens 38 and water vapor on the outside of thelens 38 such as in the form of liquid or ice. The moisture is sensed by a change in the signal generated by the proximity sensor due to the moisture content in the air on the surface of theouter lens 38. When moisture is detected, the conductive circuitry may be switched to the heater operation to remove the moisture. It should be appreciated that thehousing 36 orlens 38 may have a moisture outlet such as a GoreTex® patch to allow heated moisture to exit the interior. - The capacitive sensor employs the
first electrode 52 as a drive electrode and thesecond electrode 60 as a receive electrode, each having interdigitatedfingers first electrode 52 receives square wave drive signal pulses applied at a voltage. Thesecond electrode 60 has an output for generating an output voltage. It should be appreciated that the first andsecond electrodes corresponding electrode fingers second electrodes conductive circuitry 50 may be formed with conductive ink or may be alternatively formed with rigid or flexible circuitry that may be adhered or otherwise attached to theouter lens 38. - According to various examples, the
first electrode 52 is supplied with an input voltage as square wave signal pulses having a charge pulse cycle sufficient to charge thesecond electrode 60 to a desired voltage. Thesecond electrode 60 thereby serves as a measurement electrode. When moisture, such as humidity or condensation on the interior or exterior surface of theouter lens 38 is detected, the moisture causes a disturbance in the activation field which generates a signal that is processed to determine the moisture level. The disturbance of the activation field is detected by processing the charge pulse signals. - The
conductive circuitry 50 may be formed with a film of indium tin oxide (ITO). According to various examples, the ITO forming theconductive circuitry 50 may be formed as an ink printed onto the interior surface of theouter lens 38. The ITO may be deposited as a thin film onto the surface of theouter lens 38 and may have a thickness of about 1,000-3,000 angstroms to form a transparent electrical conductor. The ITO layer forming theconductive circuitry 50 is a substantially visually transparent medium that can be used to form the first andsecond electrodes conductive circuitry 50 will remain substantially invisible to a user looking through theouter lens 38. In other examples, other transparent and semi-transparent or visible conductive inks or films may be used to form theconductive circuitry 50. - Referring now to
FIGS. 5-6B , the first andsecond electrodes conductive fingers outer lens 38. Thefirst electrode 52 may be disposed on or adhered via an adhesive onto the inner surface ofouter lens 38. Thesecond electrode 60 is also disposed onto the inner surface ofouter lens 38 such that the second plurality offingers 62 is interdigitated with the first plurality offingers 54. In order to prevent short circuiting of the first andsecond electrodes dielectric layer 64 may be disposed between the first andsecond electrodes line 58 such that thesecond electrode 60 and second plurality ofconductive fingers 62 are separated from thefirst electrode 52 at that location as shown inFIG. 6B . The remainder of the first andsecond electrodes conductive fingers outer lens 38 as depicted inFIG. 6A . It will be understood that thedielectric layer 64 may be enlarged to cover substantially more or all of the surface area between the first and second electrodes. - Referring to
FIG. 7 , theconductive circuitry 50 is illustrated controlled by acontroller 70. The signals generated by the capacitive sensor input to thecontroller 70. Thecontroller 70 may include circuitry, such as themicroprocessor 66 and amemory 72. The control circuitry may include sense control circuitry for processing the activation field of the capacitive sensor to sense moisture proximate to theouter lens 38 and/or touching of thelight assembly 34. It will be understood that other analog and/or digital control circuitry may be employed to process the capacitive field signals to determine the presence of moisture buildup on theouter lens 38 and initiate defogging or moisture removal with activation of the heater operation as well as aid in the detection of touching of thelight assembly 34 without departing from the teachings provided herein. - The
controller 70 may include an analog-to-digital (A/D) comparator integrated within or coupled to themicroprocessor 66 and may receive voltage output from the capacitive sensor, convert the analog signal to a digital signal, and provide a digital signal to themicroprocessor 66. Thecontroller 70 may include a pulse counter integrated within or coupled to themicroprocessor 66 that counts the charge signal pulses that are applied to the drive electrode, performs a count of the pulses needed to charge the capacitor until the voltage output reaches a predetermined voltage, and provides the count to themicroprocessor 66. The pulse count is indicative of the change in capacitance of the capacitive signal. Thecontroller 70 may provide a pulse width modulated signal to a pulse width modulated drive buffer to generate the square wave pulse which is applied to the drive electrode. Thecontroller 70 may determine the moisture present at or proximate to theouter lens 38 and control the heater by controlling the switches SW1-SW4 as outputs. As will be explained in greater detail below, thecontroller 70 may also regulate the electrical current applied to thelight source 40 in response to activation of the capacitive sensor. For example, thememory 72 may include acontrol routine 74 for controlling the switches to switch operation of theconductive circuitry 50 between the capacitive sensing operation mode and the heater operation mode, alocation sensing routine 76 for determining the location of anelectronic device 78 proximate thevehicle 30, and alight control routine 80 for adjusting the intensity of light provided by thelight source 40 based on a number of factors. Theelectronic device 78 may include a cellphone, a key FOB, wearable device (e.g., fitness band, watch, glasses, jewelry, wallet), apparel (e.g., a tee shirt, gloves, shoes or other accessories), personal digital assistant, headphones and/or other devices capable of wireless transmission (e.g., radio frequency, Bluetooth, ultrasonic). - Referring to
FIG. 8 , the change in signal charge pulse counts detected during various moisture conditions is shown as signals 82A-82E. The change insignal 82A-82E is a count value difference between an initialized reference count value for different levels of moisture present on theouter lens 38. As moisture in the form of condensation on theouter lens 38 or humidity proximate thereto increases, the moisture enters the activation field associated with the capacitive sensor and causes a disruption to the capacitance, thereby resulting in a raw signal increase as shown bysignals 82B-82E.Signal 82A represents a clean lens having little or no moisture in which thesignal 82A is relatively low and steady.Signal 82B shows the signal when sensing ice on the outside surface of theouter lens 38 which has a relatively high signal output. Signal 82C shows the results of condensation formed on theouter lens 38.Signal 82D shows the effect of rain on the outer surface of theouter lens 38.Signal 82E shows a defogging signal pattern that shows the removal of moisture during the heater operation. By monitoring the signal generated by the capacitive sensor and comparing the signal to known moisture values, the condensation or humidity can be sensed and used to control the heater to remove the condensation from theouter lens 38. - Referring to
FIG. 9 , routine 100 is illustrated for controlling the switches to switch operation of theconductive circuitry 50 between the capacitive sensing operation mode and the heater operation mode.Routine 74 begins atstep 102 and proceeds to step 104 to open all switches SW1-SW4. Next, atstep 106, the second and third switches SW2 and SW3 are closed. This places theconductive circuitry 50 into the capacitive sensor mode of operation. The capacitance is then measured atstep 108. Proceeding to step 110, routine 100 determines if de-icing is required based on the measured capacitance indicating that moisture has built up on the outer lens. De-icing may be required when there is sufficient condensation on the inside or outside of the lens or snow or ice on the outside of the lens. If de-icing is not required, routine 74 returns to step 102. If de-icing is required, routine 100 proceeds to step 112 to open the second and third switches SW2 and SW3 and then to step 114 to close the first and fourth switches SW1 and SW4. This places theconductive circuitry 50 into the heater mode of operation. At this point, the heater operates to heat theouter lens 38 to remove some or all of the moisture from theouter lens 38.Routine 100 proceeds to step 116 to wait for a time period (e.g., one minute, two minutes, etc.) to operate the heater before returning to step 102. It will be appreciated that routine 100 may be repeated to cycle theconductive circuitry 50 between the capacitive sensing and heater modes of operation a predetermined number of times or if moisture is sensed again as present on theouter lens 38. - Referring again to
FIG. 7 thevehicle 30 is also equipped with one or more sensors for detecting if a person and the electronic device 78 (FIG. 2B ) are near or proximate thevehicle 30. The sensors may includewireless communication transceivers 150. Thevehicle 30 and/orlight assembly 34 may include one or a plurality ofwireless communication transceivers 150 and be configured to interact with theelectronic device 78. Thewireless communication transceivers 150 may communicate with theelectronic device 78 over a wireless signal (e.g., radio frequency). In a specific example, thewireless communication transceivers 150 may be a Bluetooth™ RN4020 module, or an RN4020 Bluetooth™ low energy PICtail board configured to communicate with theelectronic device 78 using Bluetooth™ low energy signals. Thewireless communication transceivers 150 may include a transmitter and a receiver to transmit and receive wireless signals (e.g., Bluetooth™ signals) to and from theelectronic device 78. It will be appreciated that thewireless communication transceivers 150 may utilize other forms of wireless communication between with theelectronic device 78 and otherwireless communication transceivers 150 such as Wi-Fi™ without departing from the teachings provided herein. Thewireless communication transceivers 150 may be positioned on or within thecontroller 70. Thewireless communication transceiver 150 is configured to communicate with themicroprocessor 66 such that one or more of the routines stored in thememory 72 is activated. Theelectronic device 78 may include one or more routines which control the communication between thewireless communication transceiver 150 and theelectronic device 78. For example, in mobile smart phone examples of theelectronic device 78, the phone may include one ormore applications 154 configured to communicate with thewireless communication transceivers 150. In various examples, thewireless communication transceivers 150 are standalone devices that are not in communication with body control modules, electronic control modules, engine control modules and/or other features of thevehicle 30. For example, thewireless communication transceivers 150 may only be capable of communication with thecontroller 70 and theelectronic device 78. In other examples, thewireless communication transceivers 150 may communicate with the body controller or other onboard controllers. - In examples utilizing multiple
wireless communication transceivers 150, thetransceivers 150 may be in communication with one another or may mutually communicate with a master controller or module (e.g., body control module). Thewireless communication transceivers 150 may be disposed within other accessories of thevehicle 30, or may be standalone units. Theelectronic device 78 may communicate with all, some, or none of thewireless communication transceivers 150 as theelectronic device 78 enters and exits the communication range of thetransceivers 150. Each of thewireless communication transceivers 150 may be aware of its location within thevehicle 30 and capable of sharing its location with theelectronic device 78. In various examples, thewireless communication transceivers 150 are capable of communicating with theelectronic device 78 such that the location of theelectronic device 78 may be determined therefrom (e.g., based on signal strength and/or return time of the signal) or vice versa. According to various examples, thelocation sensing routine 76 in thememory 72 of thecontroller 70 may utilize the signal strength and time to return of the signals between thewireless communication transceivers 150 and theelectronic device 78 to triangulate the position of theelectronic device 78 as the person moves around and inside of thevehicle 30. In examples where thewireless communication transceivers 150 communicate with a master module, the location of theelectronic device 78 may be calculated in the master module. The location of theelectronic device 78 may have sufficient resolution to determine which seat within thevehicle 30 the user is approaching or sitting in. Theelectronic device 78 may then share its determined location with thewireless communication transceivers 150 such that appropriate features may be activated by theappropriate transceivers 150. It will be understood that thelocation sensing routine 76 may be located on theelectronic device 78 and that any location determinations may be made by theelectronic device 78 and shared with thewireless communication transceivers 150 without departing from the teachings provided herein. - Choosing which
electronic devices 78 should be trusted, and, therefore, given access to command of thecontroller 70, may be determined based on whether theelectronic device 78 has been inside of thevehicle 30 before. Memory within thewireless communication transceivers 150 may store identifying information relating toelectronic devices 78 which were detected within the vehicle 30 (e.g., using the location sensing routine 76) and which may therefore be generally regarded as “friendly,” registered and/or as the owner of thevehicle 30. In an exemplary method of determining that an unknownelectronic device 78 is friendly, thewireless communication transceivers 150 detect the presence of an unknownelectronic device 78, detect a characteristic signal shift (e.g., attenuation or increase in signal at corresponding wireless communication transceivers 150) indicative of the unknownelectronic device 78 entering or being within thevehicle 30 across multiplewireless communication transceivers 150, and store characteristic information about theelectronic device 78 for future identification. It will be understood that a determination of the location of theelectronic device 78 to be within thevehicle 30 may also prompt a storing of the characteristic information about theelectronic device 78 for future identification. Utilizing the past and/or present location of theelectronic device 78 as a security feature to determine if it is allowed access to thecontroller 70 may be particularly advantageous as the replication of signal shifting indicative of theelectronic device 78 entering thevehicle 30 and the location of theelectronic device 78 is particularly difficult to fake. Further, it will be understood that more conventional methods of connectingelectronic devices 78, such as pairing and manually connecting, may also be utilized to designatefriendly devices 78. - The
light control routine 80 may control thelight assembly 34 in a variety of manners depending on detected properties of the electronic device 78 (e.g., known or unknown device, location, and user specific data) and/or signals from thetemperature sensor 48. For example, if a known or friendlyelectronic device 78 is detected near (e.g., within about 2 m) the rear of thevehicle 30 and the capacitive sensor detects a change in the activation field (i.e., indicative of a person in possession of theelectronic device 78 touching or getting close to the light assembly 34), thelight control routine 80 may be configured to alter an electrical current provided to thelight source 40 to change intensity of illumination from the light source 40 (e.g., by overdriving the light source 40). For example, thelight control routine 80 may begin with a step 170 (FIG. 10 ) of illuminating thelight source 40 at a first illumination. The first illumination may be a standard illumination or thelight source 40 may be off. Next, astep 174 of detecting a capacitive signal proximate thelight source 40 is performed. The capacitive signal may be the detection of a change of the activation field by the capacitive sensor. As explained above, this capacitive signal may be the touch of a user of thelight assembly 34. Next astep 178 of illuminating thelight source 40 at a second illumination in response to the detection of the capacitive signal may be carried out. The second illumination may be higher or lower relative to the first illumination. In practice, thelight control routine 80 may be advantageous in allowing the light of thelight assembly 34 to be altered in real time by a person proximate thelight assembly 34. For example, a person located proximate thelight assembly 34 may touch thelight assembly 34 in order to change (e.g., increase or decrease) the illumination of thelight assembly 34. Such a feature may be advantageous in allowing the person to increase the illumination if they are working behind thevehicle 30 or to decrease the illumination if the lights are too bright. It will be understood that the person may touch thelight assembly 34 multiple times to cycle though various illuminations provided by thelight assembly 34. Further, the cycling of various illuminations may be carried out through use of theapplication 154 on theelectronic device 78. Even further, eachlight assembly 34 may be individually controlled and/or touching onelight assembly 34 may increase or decrease the illumination from alllight assemblies 34. It will be understood that touching thelight assembly 34 may further activate thelight source 40 to emitexcitation light 24 which excites the photoluminescent structure. - According to various examples, the
light control routine 80 may only be activated while detection of a friendlyelectronic device 78 is proximate thevehicle 30. Such a feature may be advantageous in decreasing the risk of unknown people adjusting the illumination provided by thelight assembly 34 and potentially depleting the battery of thevehicle 30. - The
light control routine 80 may further be run with sensor data from thetemperature sensor 48. For example, thelight control routine 80 may further include astep 182 of detecting a temperature of thelight source 40 and astep 186 of illuminating thelight source 40 at a third illumination in response to the detection of the light source temperature. The third illumination may be less than or greater than the first and/or second illuminations. Thermal management (e.g., the expulsion or getting rid of heat) of thelight source 40 is important in maintaining an even and consistent illumination; however, the maximum operating temperature assumption for the light source 40 (e.g., about 167° F.-221° F. for an LED on a PCB) is not accurate most of the time. As such, by incorporating thetemperature sensor 48 to sense the temperature of thelight source 40, overdriving of thelight source 40 may be achieved, even if in short bursts. For example, if the capacitive sensor detects touch by the user triggering the higher second illumination, thelight source 40 may be overdriven by thecontroller 70 until thetemperature sensor 48 detects a critical temperature and rolls back driving of thelight source 40 to a lower third illumination which is sustainable. In other words, thecontroller 70 may be configured to reduce an electrical power to thelight source 40 in response to a detected temperature of thelight source 40. It will be understood that the third illumination may be greater than the first and/or second illuminations. As such, thelight assembly 34 and/orlight source 40 may be able to output an increased illumination in the second illumination compared to the first illumination (e.g., two or three times greater) for as long as can be sustained without causing permanent damage to thelight source 40. - According to various examples, detection of the location of the
electronic device 78 may allow for thelight assembly 34 to change where light is projected to using optics and/or by altering whichlight source 40 is activated. For example, as theelectronic device 78 is detected moving away or toward thevehicle 30, the optics may adjust the direction of the light from thelight assembly 34 to follow theelectronic device 78. - According to various examples, detection of location of the
electronic device 78 relative to thevehicle 30 also permits thewireless communication transceivers 150 to determine if an unrecognizedelectronic device 78 is proximate thevehicle 30. Such an unrecognizedelectronic device 78 may be owned or carried by a potential burglar or threat to thevehicle 30. In events where an unrecognizedelectronic device 78 is detected proximate thevehicle 30 for greater than a predetermined time, thewireless communication transceivers 150 and/orcontroller 70 may activate one or more counter measures. Countermeasures may include a strobe light from thelight assembly 34 or directing light from theassembly 34 at theelectronic device 78. In some examples, any available identifying information about theelectronic device 70 may be stored for later retrieval if the owner of the vehicle'selectronic device 78 is not detected proximate thevehicle 30 at the same time. - Use of the presently disclosed
vehicle 30 andlight assembly 34 may offer a variety of advantages. First, changing the illumination of thelight assembly 34, in backup light examples, may provide wide coverage behind thevehicle 30 with bright task lighting which may be advantageous for camp site set-up, work sites, etc. Second, changing the illumination of thelight assembly 34, in brake light examples, may provide light for camp sites and other outdoor activities. The benefit of the red light is that it does not attract bugs and preserves night vision. Third, changing the illumination of thelight assembly 34, in license plate light examples, may provide a direct stream of light downward in the area of a trailer hitch and the ground directly behind thevehicle 30. Fourth, headlight examples of thelight assembly 34, which typically put out large amounts of illumination, may be dimmed to be used as work lights. Fifth, the present disclosure allows a key fob or recent occupant's electronic device to function as an authorization method to control who can control thelight assembly 34. Sixth, thelight control routine 80 may turn off thelight assembly 34 at about 50% battery charge with to protect battery life of thevehicle 30. Seventh, use of thewireless communication transceivers 150 allows for thelight assembly 34 to be activated as a person approaches or leaves (e.g., to activate welcome or farewell lighting). Eighth, use of thewireless communication transceivers 150 allows for a low consumption of power from thevehicle 30 while the driver or passengers are away from thevehicle 30. Ninth, use of thephotoluminescent structure 10 on theouter lens 38, in conjunction with theconductive circuitry 50 allows a user of thevehicle 30 to tap thelight assembly 34 to excite thephotoluminescent structure 10. It will be understood that thephotoluminescent structure 10 may be excited regardless of whether thelight assembly 34 is emitting visible light. - According to various embodiments, a vehicle light assembly includes a light source, a lens positioned proximate the light source, a conductive circuitry disposed on the lens and forming a capacitive sensor, and a temperature sensor configured to detect a temperature of the light source. Embodiments of the vehicle can include any one or a combination of the following features:
-
- the conductive circuitry forming the capacitive sensor also forms a heater;
- switching circuitry for selectively switching operation of the conductive circuitry between the capacitive sensor and the heater;
- the light assembly forms a vehicle rear taillight;
- the conductive circuitry comprises an optically transparent conductive material;
- the conductive circuitry comprises a first electrode comprising a first plurality of electrode fingers and a second electrode comprising a second plurality of electrode fingers, and wherein the first plurality of conductive fingers are interdigitated with the second plurality of conductive fingers;
- a controller configured to reduce an electrical power to the light source in response to a detected temperature of the light source;
- the controller is further configured to increase an illumination provided by the light source in response to activation of the capacitive sensor;
- the conductive circuitry comprises at least one electrode that generates a capacitive signal for the capacitive sensor and generates heat for the heater; and/or
- the heater operates as a resistive heater that generates heat based on electric current.
- According to various embodiments, a method of illuminating a vehicle light assembly includes the steps: illuminating a light source at a first illumination; detecting a capacitive signal proximate the light source; and illuminating the light source at a second illumination in response to the detection of the capacitive field. Embodiments of the method can include any one or a combination of the following steps and features:
-
- detecting an electronic device proximate the light assembly;
- detection of the electronic device is performed using a Bluetooth low energy detector disposed within the light assembly;
- detecting a temperature of the light source;
- illuminating the light source at a third illumination in response to the light source temperature;
- exciting a photoluminescent structure using the light source; and/or
- heating the light assembly by passing an electric current through an electric circuitry positioned proximate the light source.
- Modifications of the disclosure will occur to those skilled in the art and to those who make or use the disclosure. Therefore, it is understood that the embodiments shown in the drawings and described above are merely for illustrative purposes and not intended to limit the scope of the disclosure, which is defined by the following claims, as interpreted according to the principles of patent law, including the doctrine of equivalents.
- For purposes of this disclosure, the term “coupled” (in all of its forms: couple, coupling, coupled, etc.) generally means the joining of two components (electrical or mechanical) directly or indirectly to one another. Such joining may be stationary in nature or movable in nature. Such joining may be achieved with the two components (electrical or mechanical) and any additional intermediate members being integrally formed as a single unitary body with one another or with the two components. Such joining may be permanent in nature, or may be removable or releasable in nature, unless otherwise stated.
- As used herein, the term “about” means that amounts, sizes, formulations, parameters, and other quantities and characteristics are not and need not be exact, but may be approximate and/or larger or smaller, as desired, reflecting tolerances, conversion factors, rounding off, measurement error and the like, and other factors known to those of skill in the art. When the term “about” is used in describing a value or an end-point of a range, the disclosure should be understood to include the specific value or end-point referred to. Whether or not a numerical value or end-point of a range in the specification recites “about,” the numerical value or end-point of a range is intended to include two embodiments: one modified by “about,” and one not modified by “about.” It will be further understood that the end-points of each of the ranges are significant both in relation to the other end-point, and independently of the other end-point.
- The terms “substantial,” “substantially,” and variations thereof as used herein are intended to note that a described feature is equal or approximately equal to a value or description. For example, a “substantially planar” surface is intended to denote a surface that is planar or approximately planar. Moreover, “substantially” is intended to denote that two values are equal or approximately equal. In some embodiments, “substantially” may denote values within about 10% of each other, such as within about 5% of each other, or within about 2% of each other.
- As used herein the terms “the,” “a,” or “an,” mean “at least one,” and should not be limited to “only one” unless explicitly indicated to the contrary. Thus, for example, reference to “a component” includes embodiments having two or more such components unless the context clearly indicates otherwise.
- It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure without departing from the spirit and scope of the disclosure. Thus, it is intended that the present disclosure cover such modifications and variations provided they come within the scope of the appended claims and their equivalents.
Claims (20)
1. A vehicle light assembly, comprising:
a light source;
a lens positioned proximate the light source;
a conductive circuitry disposed on the lens and forming a capacitive sensor;
a controller configured to increase an illumination provided by the light source in response to activation of the capacitive sensor; and
a temperature sensor configured to detect a temperature of the light source.
2. The vehicle light assembly of claim 1 , wherein the conductive circuitry forming the capacitive sensor also forms a heater.
3. The vehicle light assembly of claim 2 , further comprising:
switching circuitry for selectively switching operation of the conductive circuitry between the capacitive sensor and the heater.
4. The vehicle light assembly of claim 1 , wherein the light assembly forms a vehicle rear taillight.
5. The vehicle light assembly of claim 1 , wherein the conductive circuitry comprises an optically transparent conductive material.
6. The vehicle light assembly of claim 1 , wherein the conductive circuitry comprises a first electrode comprising a first plurality of electrode fingers and a second electrode comprising a second plurality of electrode fingers, and wherein the first plurality of conductive fingers are interdigitated with the second plurality of conductive fingers.
7. The vehicle light assembly of claim 1 , further comprising:
a controller configured to reduce an electrical power to the light source in response to a detected temperature of the light source.
8. The vehicle light assembly of claim 1 , wherein the conductive circuitry comprises at least one electrode that generates a capacitive signal for the capacitive sensor and generates heat for the heater.
9. The vehicle light assembly of claim 7 , wherein the controller is further configured to increase an illumination provided by the light source in response to activation of the capacitive sensor.
10. The vehicle light assembly of claim 1 , wherein the heater operates as a resistive heater that generates heat based on electric current.
11. A vehicle, comprising:
a vehicle light assembly comprising:
a light source;
a lens positioned proximate the light source; and
a conductive circuitry disposed on the lens and forming a capacitive sensor;
a controller configured to increase an illumination provided by the light source in response to activation of the capacitive sensor; and
one or more wireless communication transceivers configured to detect an electronic device proximate the light assembly.
12. (canceled)
13. The vehicle of claim 11 , further comprising:
a temperature sensor configured to detect a temperature of the light source.
14. The vehicle of claim 13 , wherein the controller is further configured to decrease an illumination provided by the light source in response to a signal from the temperature sensor.
15. A method of illuminating a vehicle light assembly, comprising:
illuminating a light source at a first illumination;
detecting a capacitive signal proximate the light source; and
illuminating the light source at a second illumination in response to the detection of the capacitive signal.
16. The method of claim 15 , further comprising the step:
detecting an electronic device proximate the light assembly.
17. The method of claim 16 , wherein detection of the electronic device is performed using a Bluetooth low energy detector disposed within the light assembly.
18. The method of claim 15 , further comprising the steps:
detecting a temperature of the light source; and
illuminating the light source at a third illumination in response to the detection of the light source temperature.
19. The method of claim 15 , further comprising the step:
exciting a photoluminescent structure using the light source.
20. The method of claim 15 , further comprising the step:
heating the light assembly by passing an electric current through an electric circuitry positioned proximate the light source.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US15/612,210 US10144337B1 (en) | 2017-06-02 | 2017-06-02 | Vehicle light assembly |
CN201820850641.XU CN208349213U (en) | 2017-06-02 | 2018-06-01 | Vehicle lamp component |
DE202018103097.3U DE202018103097U1 (en) | 2017-06-02 | 2018-06-01 | Vehicle light assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US15/612,210 US10144337B1 (en) | 2017-06-02 | 2017-06-02 | Vehicle light assembly |
Publications (2)
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US10144337B1 US10144337B1 (en) | 2018-12-04 |
US20180345845A1 true US20180345845A1 (en) | 2018-12-06 |
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Application Number | Title | Priority Date | Filing Date |
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US15/612,210 Active US10144337B1 (en) | 2017-06-02 | 2017-06-02 | Vehicle light assembly |
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CN (1) | CN208349213U (en) |
DE (1) | DE202018103097U1 (en) |
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2017
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2018
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US10144337B1 (en) | 2018-12-04 |
DE202018103097U1 (en) | 2018-06-26 |
CN208349213U (en) | 2019-01-08 |
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