• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    .såylšf-íïïzflflšåífwf A headíaznp assæntably having a. mechanisin før reduaing “ratar based šmntaliïïinatíšün isäiscißsßá. The mechanism inaíudæs a íens assembly having an antar lens and an ämm' ïsnsd Ahæaïing eíæmaxxt may br: áíszposcd beiweæn the ämnar and Qutm Eenses. Aítßrnaíívefiigf, inmšï anåantar íenscs may be spaceå apart hVaving a passags fenneå ïherß 'beivvaen thørough wízichfiuid nïay iiravæí. Hsat from íighï emitting åiødss and a circuit ímafå may bf:- direczteå tovfardsïhe antar lens ïhrouagh passages ferzneå in the heaaiíaznp assfimbíy. Fíg. far pubiícatiøn: 1
    公开号:SE538023C2
    申请号:SE1351030
    申请日:2012-02-09
    公开日:2016-02-09
    发明作者:Michael Marley
    申请人:
    IPC主号:
    专利说明:

    LENS UNIT FOR REDUCING WATER-BASED POLLUTION OF LAMP AND RADIATOR UNITS Embodiments Embodiments described herein generally refer to a lighting system which includes a device for removing and / or preventing water-based contamination from being used to form a liquid. LED (LED) lamp.
    A mechanism for reducing water-based contamination in a headlight assembly is provided. The mechanism uses some of the heat generated by an LED radiator or other heat generating devices within the headlight assembly to heat the lens area of an LED lamp. Thus, the heat prevents the build-up of water-based contamination in the form of snow or ice on the lens and heat is dissipated from the heat generating devices, which shortens the useful life of an LED circuit and radiator which may accumulate in the past when exposed to elevated temperatures generated by LEDs. and associated components.
    In addition, one or more resistance heating elements, in the interior of the headlight, may be used in conjunction with heat radiated by the Than LED to remove water-contaminated Than LED lamp assembly. An optically clear heat transfer fluid can be used in the interior of an LED lamp to heat the lens structure in order to prevent the accumulation of water-based dirt on the LED lamp.
    Brief Description of the Drawings Fig. 1 shows a composite front view of an embodiment of an LED lamp assembly.
    Fig. 2A is an exploded view of a lens assembly for a headlight assembly. Fig. 2B is an exploded view of the LED lamp shown in Fig. 1.
    Fig. 3A shows an exploded view of an embodiment with a lens assembly with a resistor in between.
    Fig. 3B shows a composite view of the lens assembly of Fig. 3A.
    Fig. 30 is a schematic representation of a resistance heating element.
    Fig. 4A is a schematic representation of another embodiment of a mechanism for reducing water-based contamination from a headlight assembly.
    Fig. 4B is a schematic representation of another embodiment of a mechanism for reducing water-based contamination from a headlight assembly.
    Fig. 5 illustrates a cross-sectional view of a mechanism for reducing water-based contamination of a headlight assembly.
    Figs. 6A and 6B are cross-sectional views of a mechanism for reducing water-based contamination of a headlight assembly having side channels.
    Figures 7A and 7B are cross-sectional views of embodiments of a mechanism for reducing water-based contamination of a headlight assembly using a circulation system.
    Figs. 8A, 8B and 8C are cross-sectional views of a mechanism for reducing water-based contamination from a headlight assembly comprising a solid state heat pump.
    Figures 9A and 9B represent alternative embodiments of a mechanism for reducing water-based contamination from a headlight assembly using a single lens structure.
    Fig. 9 shows a method for embedding a thread in a polycarbonate lens structure.
    Figures 10-13 illustrate embodiments of a mechanism for reducing water-based fouling from a headlight assembly comprising resistance heating elements embedded in the outer lens.
    DETAILED DESCRIPTION OF REPRESENTATIVE EMBODIMENTS In order to facilitate an understanding of the embodiments described below, reference is made to embodiments of a vehicle LED (LED) headlamp assembly and method of making them, only a few of which are shown in the drawings. It will be appreciated, however, that no limitations regarding the reception of any embodiments described are intended. A person of ordinary skill in the art will readily appreciate that modifications such as component components and materials, placement of components, type of heating and control devices, and type of electrical connections are not deviated from by the concept and scope of any embodiments described herein. Some of these possible modifications are mentioned in the following description. In addition, in the illustrated embodiments, the same reference numerals refer to the same structural elements in the various drawings.
    A headlamp assembly 10 in accordance with an embodiment of the invention is illustrated in Fig. 1. In the illustrated embodiment, the headlamp assembly includes a plurality of LEDs, one of which is shown as 12. Those skilled in the art will appreciate that the number of LEDs shown should not be construed as limiting. that more or fame LEDs can be used depending on the application of the headlight. The stalker assembly 10 includes a lens assembly 15 and a housing 20. The lens assembly 15 is made of a material that prevents the LEDs 12 from being exposed to the outdoors. For example, the lens may be made of polyester, polycarbonate, or glass. In addition, the lens assembly 15 may be a single or double lens structure which will be described in detail below. In the embodiment shown in Fig. 1, heating elements 25 are incorporated in the lens assembly 15 to support the removal of water-based contamination.
    Fig. 2A is an exploded view of a lens assembly 9 for a headlight assembly 10. An inner lens layer 14 and an outer lens layer 15, comprising side perimeter 16 terminating at the ledge 22, are shown together with sealing element 31. A resistance element 25 has been installed between the inner lens layer 14 and the outer lens layer 15 using an optically clear acrylic-based pressure sensitive adhesive as a filler and fastener. Inner and outer lenses (14, 15) can be made of polycarbonate, polyester, or glass.
    Fig. 2B is an exploded view of a headlight assembly 10, of an embodiment comprising a circuit board, LEDs 12, housing 26, and inner and outer lenses joined by an adhesive to form a lens assembly. The lens assembly of Fig. 2A is attached to housing 26 to form headlight assembly 10.
    Fig. 3a is an exploded view of an embodiment of lens assembly 15 for use with headlamp assembly 10. As shown, the lens assembly 15 is a composite lens comprising inner lens 50 and outer lens 55 with resistance heating element 60 disposed therebetween. The inner and outer lens layers 50 and 55 can be made of an optical grade material, such as polycarbonate or glass. An optical grade adhesive material, i.e. an acrylic based adhesive, is applied to the upper and lower sides of the heating element 60, which is an electrical resistance element having a sufficiently small diameter so that it does not interfere with the optical performance of the lens assembly 15. For example, suitable alternative adhesives include thermally activated or thermosetting adhesives, hot melt, core activated adhesives, such as those using crosslinking agents, UV-activated light-curing materials (LCM), encapsulating adhesives, and the like. Thus, the lens assembly 15 is manufactured for fit with sufficient precision to have the same effect as a single layer lens. To achieve this, the refractive index of the usual material must be the edge and also the geometry. Then, modifications to the geometries of each lens can be monitored to ensure that the start and end light waves of light rays passing through the lens assembly 15 match those of a single layer lens that the lens assembly 15 replaces. The refractive index of all points of interest along the lens surfaces can be determined using the following equation: nincid • sin aresul = sin aincid n result Where: aresui is the angle between a ray that has passed through a surface from one media to another and the normal line at it point on the surface where the beam passes through nincid is the refractive index of the material in which the beam travels as it approaches a spruce surface between two media. rlresui is the refractive index of the material that the beam passes into when that choice passes the spruce surface between the two with the irons. aincid is the angle between a beam as it approaches a surface between one medium and another and the normal line at the point on the surface where the beam passes through.
    The warning element 60 may be formed of copper or other base material which would function within the voltage and current limitations necessary to remove aqueous soiling from the lens assembly 15. For example, the warning element 60 may be operated at a voltage of 12-24 VDC / VAC. A maximum power of 0.1255 W / cm2 lens area can also be applied. More specifically, the heating element 60 may have specific resistance according to what consisted of the required power density, operating voltage, and specific lens area for the heating element 60 to be able to produce an average of 3.095 mg of ice per cm 2 of lens area per minute for a maximum of 30 minutes. at -35 ° C for a period not less than 30 minutes in an environmental chamber with the environmental chamber fully active during [Ada 4 minute durations. The total power (in watts) can be determined by multiplying the effective area has the lens assembly 15 which needs to be cleaned tan water-based soiling (in cm2) times the power per lens area. Thus, the resistance of the heating element 60 depends on the type of material used to make the resistance heating element 60, such as its diameter.
    In some embodiments, resistance heating elements 30 may be formed by depositing a layer of indium tin oxide (ITO) metal film on a polyester sheet, as made of Minco®. The diameter of the heating element 60 may be in the range of 10-20 microns. According to one embodiment, heating element 60 is arranged in a sample and arranged between two sheets of polyester, such as ThermalClearTm. In some alternative embodiments, heating elements 60 may be fabricated by depositing a layer of indium tin oxide (ITO) metal film on a polyester sheet, as manufactured by MincoO. In addition, the material used to make heating elements 60 may be copper or a transparent conductive oxide such as indium tin oxide (ITO), fluorine doped tin oxide (FTO), and doped zinc oxide or other similar conductive and optically transparent materials.
    The lens assembly 15 is shown in a composite configuration in Fig. 3b. According to one embodiment, the lens assembly 15 is fabricated by placing heating element 60 in a pressure sensitive adhesive material using a robotic fixture or other controllable / repeatable device that can place heating element 60. Warning element 60, which contains adhesive, is then inserted between the lens layers, 50 and 55, is pressed together by means of a clamp, piston, screw cap, or other device for applying a clamping force to the lens assembly 15 by contacting an inner surface 62 having the inner lens 50 and an outer surface 63 having the outer lens 55 with resilient interlayers (rubber blocks , etc). The resilient interlayers can be formed so as to contact central portions of the inner and outer lenses, 50 and 55, before being deformed to create contact with the remainder of inner surface 62 and outer surface 64 in order to expel air and other trapped gases.
    Alternatively, heating element 60 or tad can be embedded in a lens via an ultrasound procedure. Essentially, the procedure begins with determining a mounting location in the lens substrate. Then a thread is drawn on an embedding tool that is as sharp as a sonotrode. Sonotrode helps to press the wire against the lens substrate and includes an ultrasonic transducer, which heats the wire with the help of friction. At the same time, the molecules in the polycarbonate substrate vibrate very fast so that the lens material melts in the area of the aperture. Thus, the wire is embedded in the polycarbonate substrate with the help of pressure and heat. A final step in the process includes connecting spirits of the wire that are not embedded to the cable fastener on the lens substrate.
    Fig. 3c shows a view of a circuit 70 used in an embodiment for providing power to a heating element 60. The circuit 70 comprises a resistance heating element 60 made of a thin wire, which comprises any heist of several materials including copper, indium tin oxide (ITO ), fluorine doped tin oxide (FT0), and doped zinc oxide. Preferably, the materials selected for heating elements 60 should be optically transparent and able to withstand fluctuations in the current flow direction. Heating elements 60 are arranged as a pair of metallic or metal oxide loops which are connected in parallel. A first loop 72 is connected to lines A and B. A second loop 74 is connected to lines B and C. The circuit design allows the use of either a 24 volt or 12 volt system at the same power level. Thus, for 24 volt operation, only lines A and C are used. For 12 volt operation, lines A and C are connected together to one pole and line B to the other pole.
    A simple control system 100 can be used to let the heating element 60 operate automatically. Automatic or manual control logic would dictate that as long as the ambient temperature locally at the lens unit is within the temperature range where water-based contamination can occur, the heating element 60 is active (power on). An autonomous control system may be constructed by a comparator which sets the heating element 60 on or off based on the resistance value of the heating element 60 (which would vary with the ignition temperature). The resistance value can be compared with an installed threshold resistance which is associated with a maximum temperature in the area in which water-based contamination can occur. Then, if the resistance value is at or below the threshold, the connator switches to close the circuit which supplies the warning element 60 with effect and remains in that state. Similarly, if the resistance value is above the threshold resistance, the comparator switches to open the circuit and interrupt the power to the mechanism, which remains in a shut-off state. The threshold value can be determined by means of a calculation which uses the material properties of the resistance element, the adhesive, and the lens material and the geometries and which is verified by end-empirical experiments or is determined only by empirical experiments. Alternatively, the control system may use a separate electronic temperature indicating device. The control system can simply be a control device that is controlled manually, it can be controlled by a programmable logic controller, or others can be set to turn the device on / off, or the device can also be left on at all times.
    Fig. 4A is a schematic representation of another embodiment of a water pollution contamination mechanism 110 Than a headlight assembly 10. The mechanism 110 includes inner and outer lenses 120 and 121 and an energy source that emits energy in the form of heat. The energy source can be LEDs 125, or any other part that emits energy in the form of heat either according to mechanical or electrical principles. An optically clear fluid, in gaseous or liquid form, is passed past the energy sources (LEDs 125) by means of a mechanical screen or electrically driven pump, float, compressor or the like. In the embodiment shown, a flat 122 is used to circulate the fluid. Free convection can also be used to transfer heat energy from the energy source 125 to mass particles present in the fluid, which is then passed through a channel 128 between inner lens 120 and outer lens 121. Heat energy is then transferred from the fluid mass particles to lenses 120 and 121 so that accumulation of aqueous soiling cannot occur. The heat energy also removes any previously accumulated water-based contamination from the lenses 120 and 121. The mechanism 110 can be used alone or in conjunction with another device, such as a heating element, in order to provide sufficient energy to the lenses 120 and 121. The fluid can be channeled using existing geometries within the lens assembly 15 and additional geometries may be provided to provide passages for the fluid. The fluid may be partially or completely encapsulated or free-flowing towards the lenses 120 and 121. In the embodiment shown in Fig. 4a, channel 128 facilitates the transfer of cold air which has the outer lens 121, which is exposed to the outside of the steel caster, to the LEDs 125 in order to reduce the temperature of the LEDs 125. Thus, the mechanism 110 provides a means of distributing hot and cooled fluid within headlight assembly 10. It will be appreciated by those skilled in the art that "fluid" as used may include liquid, gaseous substances, including air or other free-flowing polymers. fluids, partially or completely encapsulated fluids, as well as fluids comprising nasal particles. Representative heat transfer fluids known in the art may also include polyolefins, polyalphaolefins, diphenylethanes, and the like, which are manufactured and sold by Radco®.
    Fig. 4b is a schematic representation of an embodiment of a mechanism 210 for reducing aqueous pollution from a headlamp assembly 10. Similar to the embodiment described in connection with Fig. 4a, the mechanism 210 includes inner and outer lenses 220 and 221 having a channel 128 therebetween, a flange 222 and LEDs 225 which emit energy in the form of heat. In addition, the mechanism 210 includes a heat sink 230 having fins 232. A solid state heat pump 235, such as a Peltier device, can be inserted between the heat sink 230 and the LEDs 125. When activated, the solid state heat pump 235 operates to irradiate the direction of energy transfer and obtain energy. to flood the Iran heat sink 230 to the LEDs 125, as indicated by arrow 237, under controlled conditions whereby the LEDs 125 would not be damaged due to overheating.
    The transfer of heat to the LEDs 125 can be used as the temperature locally at the mechanism 210 and the LEDs 125 are sufficiently low so that the conditions are correct for aqueous pollution to develop or accumulate on the outer lens 121. Heat pump 235 also increases the energy transferred from the LED to fluid, whereby energy is efficiently supplied to the outer lens 121 for the purpose of removing water-based contamination. Additional solid state heat pumps, or other types of heat pumps, may be used at other positions each of the lifts surrounding a fluid channel used for the purpose of transferring energy as described above.
    As an edge in the field of technology, the Peltier heat pump 235 works based on the Thomson effect, which is based on the principle that electrical potential difference is proportional to temperature difference. Closer to home, a tern gradient is created when there is a tin temperature difference along one conductor, so that one part of the conductor is warmer while the other is colder. Thermal energy in the form of electrons will naturally travel -Iran the warmer part of the conductor to the colder part.
    In terms of polarity, electrons normally travel from positive to negative. The Peltier effect includes the discovery that as current flows through a circuit comprising two or more numbers of varying electrical properties (e.g. n-type vs. p-type), then the current drives a transfer of heat from one connection point to another. However, when the polarity is reversed as is the case under a applied voltage, electrons can travel in the opposite direction (ie from negative to positive). Thus, heat transfer will also take place in the opposite direction. Thus, the direction of heat transfer can be controlled by manipulating the polarity of the stream traveling through the Peltier heat pump 235.
    Heat generated by LEDs 125, circuit boards (not shown in Fig. 4b), or 8 other heat generating devices can be absorbed by the heat sink 230. In order to prevent absorbed heat from being released into the atmosphere via the fins 232, heat pump 235 can be activated for the purpose of transporting heat. from heat sink 230 to a duct arranged below the heat sink. In one embodiment, sensors may be used to detect when the temperature of the fluid falls below a particular level, at which point a control circuit may activate heat pump 235 for the purpose of transporting layers of heat from heat sink 230 to thereby facilitate circulation of hot fluid within the mechanism 210. The heat sink 230, which collects and stores heat originating in heat generating devices. These heat generating devices may include LEDs, resistors, flares or air pumps, power electronics that include but are not limited to linear and switch installation current regulators, which may be used to drive or regulate the power within the lamp. Heat sink 330 can essentially collect heat Than any heist device that generates heat within the lamp, whether or not it is the primary function of the device that Ora said. Thereafter, heat collected by heat sink 330 can be released to the atmosphere via the fins 332.
    Figs. Illustrate a cross-sectional view of a mechanism 310 for reducing water-based contamination from a headlight assembly 10. The mechanism 310 includes an inner lens 320 and an outer lens 321 and heat sources, including LEDs and a circuit board 325. A channel 326 is provided below the circuit board. allow passage of flu idum. As discussed above, the protection generated by LEDs and associated circuits on the circuit board 325 is transmitted to the channel 326 via a convection process. A channel 328 for transfer fluid is also provided between the inner and outer lenses 320 and 321. Thereafter, a portion of the guard transferred to the channel 326 lands the mechanism 310 via the heat sink 330 having fins 332.
    More specifically, a free convection process can be used to circulate the fluid between the inner and outer lenses 320 and 321 for the purpose of reducing the melting of snow and ice from the outer lens 321. In this embodiment, heat is transferred to the fluid by means of geometries within the lens structure. The initial temperature of channel 328 is cold. Second fluid flow channel 326 is provided below circuit board 325 and facilitates absorption of heat originating in circuit board 325. Thus, the initial temperature of channel 326 is warn. As illustrated in Figs. 6a and 6b, side channels 327, 327 ', which are located in opposite side cradles of the mechanism 310, connect the channels 326 and 328. The channels can be formed at an angle in the range of 10 - 30 °, as in Figs. 6a, 9 to an angle of approximately 120-10, as shown in Fig. 6b. The angled side channels 327, 327 'as well as the channels 326 and 328 represent a system of channels that allow hot fluid to flow within the mechanism 310 via a free convection process enhanced by gravity, density, and barability. This process optimizes the fluid flow within the dual lens structure, which is generated by absorption and desorption of heat as discussed below.
    Hot fluid located in channel 326 naturally has a lower density than the colder fluid located in channel 328. Gravitational acceleration creates a buoyancy force that causes the colder, heavier fluid in channel 328 to move away from the warmer fluid in channel 326. As the colder fluid collects in channel 326, it absorbs heat from the circuit board 325, LEDs and other heat generating devices. As the fluid becomes hotter, viscous forces in the fluid decrease and buoyancy forces that facilitate fluid flow increase. The flow forces thus run if the viscous forces in the fluid and flow begin against the channels 328. The pressure within the side channels is minimized by optimizing the cross-sectional area of the channels so that the cross-sectional area increases in the direction of the desired fluid flow. Thus, the fluid flow within the side channels in the direction of channel 328 and Or's resistance in the direction of channel 326. When the fluid selects channel 328, its heat is desorbed by snow and ice that accumulates on the outer lens 321. This stationary process repeats itself continuously until outer. lens 321 is free from water-based soiling caused by cold outdoor tin temperatures.
    Fig. 7a is a cross-sectional view of another embodiment of a mechanism 410 for reducing water contamination from a headlight assembly 10. Mechanism 410 includes inner lens 420 and outer lens 421 and warning sources, including LEDs and a circuit board 425. A channel 426 is connected to the circuit board. 425 for allowing the passage of air. As discussed above, each circuit generated by LEDs and associated circuits on the circuit board 425 is transmitted to the channel 426 via a convection process. A circulation device such as a flap 427 is provided to further encourage air circulation within the inner tube 410. A channel 428 for the transfer fluid barrel is also located between inner and outer lenses 420 and 421. Thereafter, some of the heat transferred to the channel 426 leaves the mechanism 410 via heat sink 430 which has fins 432.
    Fig. 7b is a cross-sectional view of mechanism 410 'used in a fluid circulating within channels 426' and 428 '. As discussed above, the liquid may be a heat transfer fluid that is edge in the art, such as polyolefins, polyalphaolefins, diphenylethanes, and the like. A pump 427 'is arranged to circulate the liquid within the mechanism 410.
    Figs. 8a, 8b, and 8c are cross-sectional views of a water pollution contamination mechanism 510 than a headlight assembly 10 including a solid state heat pump 512. Fig. 8a illustrates mechanism 510 with a single lens 521. Heat sources, including LEDs and a circuit board 525 are provided. ox. In the embodiment of Fig. 8a, heat is transferred by means of solid state heat pump 512. As discussed above, heat pump 512 heats from a heat sink 530 to the circuit board 525. Thus, heat heaters, including circuit boards 525, can be directed toward the lens 521 to heat the lens 521 for reduction of water - based contamination from a headlamp assembly 10.
    The embodiment shown in Fig. 8b is also a mechanism 510 'for reducing water-based contamination from a lens, utilizing a heat pump 512'. The mechanism 510 'includes inner lens 520' and outer lens 521 '. As discussed with respect to Fig. 5, the protection generated by LEDs and associated circuits on circuit boards 525 'is transmitted to a channel 526' via a convection process. A fluid transfer channel 528 'is also located between inner and outer lenses 520' and 521 '. Heating sources, including LEDs and a 525 'circuit board, have also been provided. In the embodiment according to Fig. 8b, a solid state heat pump 512 'is arranged below circuit board 525' and functions to draw the heat tan circuit board 525 'and the LEDs. The heat is then transferred from heat pump 512 'to channel 528' to heat the fluid within the channel. The heated fluid is then passed further up through channels formed in the sides of the nanekanisnn to channel 528. The warning air can then heat the lens 521 to reduce water pollution Than jet head assembly 10. Heat transfer away from the circuit board 525 'and the LEDs also reduce the ignition temperature of the circuit element and the LEDs, which prevents decomposition due to heat.
    Fig. 8c depicts a mechanism 510 "for reducing water soiling from a lens, utilizing a first heat pump 512" and a second heat pump 513 ". The mechanism 510" includes inner lens 520 "and outer lens 521". Heat generated by LEDs and associated circuits on circuit boards 525 'is transferred to a channel 526 "via a convection process. A channel 528" for transfer fluid is also located between inner and outer lenses 520 "and 521". A first solid state heat pump 512 "is located below circuit board 11 525" and is active to draw heat from circuit board 525 "and the LEDs. The heat is then transferred from heat pump 512" to channel 526 "to heat the fluid within the channel. In addition, a second heat pump 513 "arranged next to heat sink 530" for transferring heat from heat sink 530 "to channel 526". The heated fluid is then passed further up through channels formed in the sides of mechanism 510 "to channel 528". The heated air can then heat the lens 521 for reducing water - based pollution Than a headlight assembly 10.
    Figures 9a and 9b represent alternative embodiments of a mechanism 610, 610 'for reducing aqueous soiling than a headlight assembly 10 utilizing a single lens structure. As shown, a device that moves air, such as a vane or air pump, 612, 612 'is arranged in a compartment 613, 613', under circuit boards 625, 625 'and in the immediate vicinity of a duct 626, 626'. Heat from circuit boards 625, 625 'is drawn into channel 626, 626' and through passages 627, 627 'towards compartment 613, 613'. Flats 612, 612 'function to force the air into a chamber 628, 628' within mechanism 610, 610 'to circulate in order to prevent hot air from being trapped in a particular area. Hot air radiating from LEDs and circuit boards 625, 625 'rises to lens 630, 630'. If snow or ice has accumulated on lens 630, 630 'then this heat will help to melt the snow and / or ice. If, on the other hand, the temperature of the lens 630, 630 'is the same as or warmer than the air inside the chamber 628, 628', the warning will tend to build up in the circuit below the lens 630, 630 'and above the circuit board 625, 625' which causes a risk of LEDs and other circuits. Flattening 612, 612 'draws colder air, which has a higher density, which naturally moves towards the bottom part of the headlight, up to the part nnellan lens 630, 630' and circuit board 625, 625 ', and thus facilitates an exchange of warmer air which has got stuck within this area. As shown, one or more halls 632, 632 'may be provided in circuit boards 625, 625' to facilitate transfer of air to the bottom portion of the canister 610, 610 ', through halls 632, 632' and into the chamber 628, 628 ', thereby circulating air. throughout the mechanism 610, 610 ', and in particular circulating hot air generated by LEDs and circuits to facilitate reduction of aqueous pollution tan a headlight assembly 10. The embodiment of Fig. 9b further comprises a solid state heat pump or thermal token 635 to further help reduce water-based contamination from a headlight assembly 10. Heat pump 635 draws heat from circuit board 625 'and LEDs down into duct 626' where heat is transferred, via flake 612 ', to air within 12 duct 628' in the manner described above .
    As illustrated in each of Figures 10-13, a resistance heating element may be embedded in the outer lens of any of the previously discussed embodiments. Referring to Fig. 10, there is shown a mechanism 710 for reducing water contamination from a headlamp assembly 10 with resistance heating elements 712. Heating elements 712 are driven by circuit boards 725 and provide heat to lens 730 when snow and ice accumulate on the lens, thereby clearing water lenses. which can act as a filter that reduces the transmittance of light through lens 730.
    Fig. 11 illustrates an alternative embodiment to that described in Fig. 10. A mechanism 810 for reducing water soiling from a headlight assembly 10 is shown with resistance heating elements 812 embedded in an outer lens 830. An inner lens 831 is also shown with a channel 836 formed therebetween. Fluid within channel 836 flows through side channels and through channel 839, which is formed between circuit board 845 and heat sink 850. When that selection is heated, the resistance heating element 812 provides heat to outer lens 830 in order to facilitate removal of water-based contamination, such as sn6 and ice. Than the outer lens. In addition, the resistance heating element 812 provides a means of facilitating the circulation of fluid within channels 836 and 839 by transferring heat to the fluid which causes the molecules of the fluid to move more rapidly thereby increasing the flow of fluid.
    Fig. 12 represents a modified version of the embodiment described in Fig. 10. A mechanism 910 for reducing water soiling. A jet catheter assembly 10 is shown with resistance heating element 912 embedded in a single lens 930. The resistance warning element 912 is powered from circuit board 9 to circuit board 9. when snow and ice accumulate on the lens, thereby clearing the lens of water-based debris that may act as a filter that reduces the permeability of light through lens 930.
    In addition, as shown by the arrows, hot air emanating from LEDs and circuit boards 945 and associated circuits to lens 930 is transmitted via heat pump 948. Heat from heat sink 946 is also transferred to lens 930. Thus, lens 930 is supplied with heat by means of a resistance heating element 912 as well. In particular, the transfer of heat radiating LEDs and circuit boards 945 by means of a heat pump 948. This produces a dual advantage in that water-based contamination is melted from lens 930 and thereby increases optical transmittance, and heat is reduced in the area of LEDs and associated circuits. usable life for the headlight. The heat pump operates in the manner described with respect to Fig. 8a.
    The embodiment shown in Fig. 13 is a mechanism 1010 for reducing water soiling from a headlight assembly 10 and is shown with resistance heating elements 1012 embedded in a lens 1013. As described with respect to the embodiment of Fig. 9b, mechanism 1010 includes a solid state heat pump or thermal pole to further help reduce water pollution Than a headlight assembly 10. Heat pump 1035 draws heat Than circuit board 1045 and LEDs down into a duct 1046 where heat is transferred through passages 1048 to chamber 1050. A flue 1052 conducts air through openings 1055 and into chamber 1060 against lens 1013 in the manner described above.
    A control system can be used in any of the embodiments discussed above. The system includes a temperature sensor that measures the temperature in and around the lens structure. Sensor 520 may include a resistance temperature detector (RTD), positive temperature coefficient thermistor (FTC), or any other type of temperature sensor known in the art, including variable resistors, thermistors, bimetallic circuits, bimetallic switches, linear and switchgear current regulators. The temperature read by the sensor is converted into a signal and transferred to a comparator. The comparator compares the current temperature reading to a threshold temperature value stored within the device. If the current temperature is below the threshold value, the comparator sends a signal to a switch in order to activate the heating element, the heat transfer fluid circulation device, or the Peltier warning pump to warn the double or single lens structure in order to melt water-accumulated LED-accumulated accumulated LED. Similarly, when the current temperature read by the sensor is above the threshold temperature value, the comparator can send a signal to the switch in order to deactivate the heating element, the heat transfer fluid circulation device, or the Peltier heat pump and thus can be stored by the warning water and possibly slack. .
    It will be appreciated by those skilled in the art that the above description is not limited to the embodiments discussed herein and that other methods of controlling heating elements, heat transfer fluid circulation devices, or Peltier heat pumps may be utilized. These methods may include manual activation and deactivation of heating elements, heat transfer fluid circulation device, or Peltier device via a palav switch. Other alternative embodiments include continuous activation of the elements so that the LED lamp temperature is sufficiently high to prevent the accumulation of aqueous pollution but sufficient to prevent unwanted thermal degradation of the LED lamp and its components.
    权利要求:
    Claims (10)
    [1] 1. We oiaim: t. A lens assembly tor reducing water based contarnination in a headiampassembly comprising: an outer lens iayer having an inner surface and an outar surface; a first adhesive layer disposed on top of the inner surface of the outer lensiayer; a heating element, compriseci of a pluraiity of toops of wire capaole ofbeing resistively heated upon application of an electrical current to the wire, saidheating element disposed on top of the first adhesive layer; a second adhesive layer, disposed on top oi the heating element; an inner lens layer having in inner surface and an outer surface, whereinthe outer surface of the inner lens iayer is in contact with the second acihesivelayer; wherein the first and second acihesive layers bond the outer tens layer, theheating element and the inner tens layer to form a composite structure; and wherein the adhesive used in the first and second adhesive iayers has anappropriate index of refraction to allow the composite structure to function as a lens.
    [2] 2. The lens assembly of ciaim 'l wherein at least two of the pturality of loops of wire in the heating eiement are connected in paraiiei.
    [3] 3. The tens assembly of ciaim t wherein at least two of the piuraiity of loops of wire in the heating element are connected in series.
    [4] 4. The lens assembiy ot claim 'i wherein the inner surface of the inner lens layer has optical surfaces disposed thereon. 18
    [5] 5. The lens assembly of clairn l, wherein the inner and outar lens layers areformed from a. material selected from the group consisting of polycarbonate and glass.
    [6] 6. A lamp assembly comprising:a housing; a lens assembly secured to the housing, and defining an interior thereof, said lens assembly further comprising: an outer lens layer having an inner surface and an outer surface; a first aclheslve layer disposed on top of the inner surface of the outar lens layer;a heating element, disposed on top cl the first adhesive layer; a second adhesive layer, disposeci on top of the heating element; an inner lens layer having in inner surface and an outer surface, wherein theoutar surface of the inner lens layer is in contact with the second adhesive layer,and wherein the first and second adhesive layers bond the outer lens layer, theheating element and the inner lens layer to form a composite structure; a oircuit board disposed within the interior of the housing; a plurality of light emitting diodes, disposed upon the circuit board and conliguredto emil light through the lens assembly; and a control system for actlvating the heating element when the lamp isexposed to an ambient temperature within a range of temperatures at which water based contamination oocurs.
    [7] 7. The lamp assembly of ciairn 6, wherein the control system further comprises aoornparator that selectively activates and deaotivates the heating element based 19 on a resistance value of the heating element, wherein the resistance value iscompared to a set value that is associated with the maximum temperature of therange wherein water based contamination may occur.
    [8] 8. The lamp assembly of cialrn S, wherein the adhesive used in the first andsecond adhesive layers has an appropriate index of refraction to allow the composite structure to function as a tens.
    [9] 9. The lamp assembly ot ciaim 6, wherein the heating element is adapted for use with an input voltage in the range of 12 to 24 V.
    [10] 10. A lamp assembly comprising: a housing; a lens assembly secured to the housing, and detining an interior thereof;a circuit board disposed within the interior of the housing; a plurality of light ernitting diodes, disposed upon the circuit board and configuredto emit light through the lens assembiy; an opticaily clear heat transfer fiuid, disposed within the interior of the housing;a circulation system adapted for circulating the heat transfer fiuid between the piurality of light emitting diode and the lens assembly, wherein heat produced bythe light emitting diodes is transferred by the heat transfer fiuid to the lens assembly; and ia cantmt system før actëvating the circušatšnn systern when tha šnrnpe äsexpnsnd to aan ambient temperature within a range nt temperaturen at whichwater based nnntatnšnatšnn nncuts.
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    同族专利:
    公开号 | 公开日
    EP2673561A2|2013-12-18|
    SE1351030A1|2013-11-06|
    EP2673561A4|2014-11-26|
    WO2012109442A2|2012-08-16|
    AU2012214344A1|2013-09-19|
    CA2861945C|2017-08-29|
    AU2012214344B2|2015-07-09|
    CA2861945A1|2012-08-16|
    WO2012109442A3|2013-11-14|
    US20120201031A1|2012-08-09|
    MX2013009224A|2014-09-15|
    US8459848B2|2013-06-11|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US13/024,323|US8459848B2|2011-02-09|2011-02-09|Headlamp assembly for removing water based contamination|
    PCT/US2012/024479|WO2012109442A2|2011-02-09|2012-02-09|Headlamp assembly for removing water based contamination|
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