• 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:
    For defrosting the cover (11) of a motor vehicle headlight, the headlight has a defrosting device (T, T ') in addition to a radiation emitter (12), z. B. IR emitter, a radiation coupling device (13) on. Radiation generated by the emitter (12) is fed into the cover plate (11) via the radiation coupling device (13) and is guided there by reflection within the cover plate (11) tangentially to its outer surface (10). The radiation can couple in on the outer surface located water or Eisabscheidungen and thus heat them targeted.
    公开号:AT519473A4
    申请号:T50029/2017
    申请日:2017-01-16
    公开日:2018-07-15
    发明作者:Mayer Peter
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    Headlamp with defrosting device
    The invention relates to a headlamp, in particular for vehicles and especially for motor vehicles (KFZ), comprising a housing with an opening, a light source (or possibly more), as well as a cover which closes the opening and a cover for the passage of visible light having the light source.
    In the case of headlamps, in particular in unfavorable weather conditions, waterdrops or water droplets and / or ice formations are frequently formed, for example by deposition (rain, snow, but also fog including ice mist) or by separation from water vapor contained in the air (in particular condensation or frost formation) ). These deposits of liquid or frozen water, due to absorption and deflection of the light, not only hinder the radiation of the light from the headlight, but also affect the correct formation of a desired light image.
    Defrosting serve to eliminate such water / ice coverings. Known headlight defrosting devices see a radiation source, eg. As an IR source, inside the headlamp, which illuminates the cover plate from the inside, typically in the direction of travel, and so heated. However, this heating affects all areas of the disc, including the clean, because the radiation is emitted evenly distributed, without taking into account the real Betauungssituation on the cover.
    It is an object of the invention to provide a headlight, which allows an improved and targeted, at the same time easy safe removal of liquid or frozen water that has formed on the cover.
    This object is achieved on the basis of a headlamp of the type mentioned by a defrosting device with a radiation emitter and a radiation coupling device, wherein radiation generated by the radiation emitter can be fed into the cover plate by the radiation coupling device. The coupling device is set up to introduce (introduce) the radiation into the cover pane, namely in such a way that the radiation within the cover pane is reflected along an outer surface of the cover pane - in particular by reflection on the outer surface, as a rule (multiple) total reflection at the boundary surfaces, similar to how a fiber-optic cable is routed. The defrosting device is thus adapted to heat by means of injected radiation on the surface of the cover located aqueous deposits and so defrost. Here, by aqueous deposits is meant any kind of water on the surface, wherein the water may be in liquid form or as ice; the water / ice may be deposited (e.g., by rain, splash, snowfall) or deposited (fog, humidity).
    Through this solution, the task, and in particular a targeted defrosting or defrosting of the cover succeeds in an efficient manner. The radiation, which is fed by the coupling device, does not serve as a contribution to the generation of light or a light image in front of the headlight, but serves to heat the cover, preferably of water and ice, which has formed on the outer surface of the cover. This results in a warming of the cover disc urgently in those areas where a coating consists of liquid or frozen water. This also leads to a better utilization of the radiation and faster defrosting. This is in contrast to conventional means for heating the cover by means of radiation from the interior of the headlight, which cause a substantially uniform distribution of the radiation, regardless of the current Betauungssituation, and thus have lower efficiency.
    In a preferred embodiment of the invention, the radiation emitter may be separate from the light source, for example a separate radiation source which does not or only weakly emits in the visible range. Preferably, in this case, the emitter is disposed within the housing of the headlamp. In addition, provision may be made for the (one or more) light source (s) to be arranged in (at least) one light module for generating a predetermined light distribution in front of the headlight, while the radiation emitter is arranged outside the (at least one) light module.
    The radiation which is generated by the emitter of the defrosting device according to the invention can, in particular, be an electromagnetic radiation of a non-visible light region, for example IR radiation. With radiation in the IR range, the goal of the invention can usually be achieved most efficiently, and in addition spectral ranges can be selected which are absorbed in water.
    In addition, it may be advantageous if a radiation shielding screen (cover) between the radiation emitter and the cover is provided. This ensures that the emitter is not visible to a viewer from the outside, thus improving the appearance of the spotlight for the viewer. This may be particularly useful in the case where the emitter is realized by the light source (rather than as a separate element).
    A simple realization of the radiation coupling device results, if this is formed as a component of the cover plate device, preferably in one piece with the cover plate.
    The radiation emitter can be positioned or set up in such a way that the radiation is conducted directly into the coupling device, ie without any optical components located therebetween. Alternatively, optical components may be provided in the optical path between the radiation emitter and the coupling device in order to guide the radiation from the radiation emitter to the coupling device. Optical components are optical components such as lenses and, in particular, mirrors (for example, concave mirrors), which cause a transformation and / or deflection of the beam path; By means of such optical components, a better yield of the radiation generated by the emitter, e.g. through bundling.
    The invention together with further advantages will be explained in more detail below with reference to an exemplary embodiment, which relates to a motor vehicle headlamp with a device for defrosting / deicing using IR light and which is shown in the accompanying drawings. The embodiment serves to illustrate the invention; it is merely exemplary in nature and is not to be construed as limiting the invention. The drawings show:
    Figure 1 shows the headlamp according to the embodiment in a sectional view. and FIG. 2 shows a detail of the cover plate with a water drop located thereon.
    In Fig. 1, a motor vehicle headlight S according to the embodiment in a sectional view (vertical section) is shown, as well as various components, which partly serve the embodiment of the invention, partly for various developments of the invention may be advantageous or expedient. The headlamp S comprises a cover device 1 and a headlamp housing 2, e.g. can be made of metal or plastic. The housing 2 has at the front a light exit opening which is surrounded by a front edge 3 and which is closed by the cover plate device 1, which includes a transparent cover plate 11 (often also referred to as a lens). The cover plate 11 is formed of glass or transparent plastic and can be formed as a so-called clear disc without opüsch effective scattering elements or as a diffusing screen, which at least partially opüsch effective scattering elements (for example, prisms or cylindrical lenses).
    At least one light module 4 is arranged in the interior of the headlight housing 2, with only one light module 4 being shown by way of example in the drawing. The light module 4 is formed in the embodiment shown as a module with light source and reflectors; In other embodiments, instead of or in addition to the reflector, lenses and / or light guide body may be provided. The light module 4 comprises at least one light source 5, for example two or more light sources, for example in the form of semiconductor light source (s), for emitting light in a wavelength range visible to the human eye. The light sources 5 are preferably formed as light-emitting diodes (LED), which emits white light. The light emitted by the semiconductor light sources 5 is focused by means of a primary optics 6 and reflected to generate a predetermined light distribution in the light exit direction 7 on a roadway in front of the vehicle. In the embodiment shown here, the primary optic 6 is a reflector, e.g. trained so-called half-shell reflector. Each light source 5 is positioned on a support 8 and electrically contacted. Each support 8 is in turn mounted on a heat sink 9, which serves to dissipate the heat generated by the light source 5 during the Beuiebs. However, this heat, which is delivered to the interior of the housing 2, is usually not sufficient to heat the cover 11 so far that its outer surface 10 would be defrosted even at low ambient temperatures.
    According to the invention, in the headlight S, a defrosting system T for defrosting / defrosting the headlamp, more precisely, the cover plate 11 is provided. The system consists of an emitter 12, which generates a radiation R, and a coupling device 13, which causes a supply of radiation from the emitter 12 in the cover plate 11 and therein tangential light pipe of the radiation R.
    As the emitter 12 is used e.g. an infrared LED or an IR laser. The radiation R emitted by the emitter 12 falls directly onto a coupling surface 14 of the coupling device 13 and / or is directed onto it by means of a reflector 15 (or bundled with other optical means (not shown)) and enters the coupling device 13 there.
    The radiation R is passed through the coupling device 13 further into the cover 11. As a result, the radiation R is tangentially coupled into the cover, which is illustrated by the arrow 17. Due to the total reflection in the cover 11, the radiation R is not or only to a small extent (in the clean state of the outer surface 10) coupled to the outside. In other embodiments, the coupling of the radiation can be done directly in the propagation direction without mirror.
    Of course, various modifications of the Abtausystems invention are possible. Thus, in a variant Τ 'of the defrosting system it can be provided that the radiation R is conducted from the emitter 12' directly (i.e., without intervening optical elements) into the coupling device 13 '. The coupling device may also include mirror element (s) 16 for efficiently guiding the light along a desired direction (arrow 17) into the cover disk 11.
    In addition, a privacy 18 may be provided, which is impermeable at least for the radiation R and is arranged between the emitter 12 and the cover 11. Through this privacy, the radiation R can not be emitted to the outside; if the privacy screen is also impermeable to visible light, the defrosting device T is also not visible to the viewer from the outside. The screen 18, which may be formed, for example, as a preformed, opaque film, in addition to the defrosting T cover other parts of the headlight interior, for example, the entire headlight background with the exception of the light module. 4
    The radiation R is guided in the cover plate preferably substantially tangentially to an outer surface 10 of the cover, namely at such a shallow angle to the outer surface 10 that (at least in the case of a non-covering outer surface) total reflection occurs. Instead of total reflection, a sufficiently high degree of reflectance may suffice if this is sufficient to illuminate the region of the outer surface 10 to be detoxified, which is to be kept free of coverings, and to heat any water / ice coverings adhering to it by means of the light energy thus supplied. In other words, in the cover 11, there is essentially a propagation 17 of the radiation transversely to the direction 7 of the passage of the visible light.
    As illustrated in FIG. 2, the radiation R propagates within the cover 11. In a clean cover 11, the radiation remains by total reflection on the surfaces of the cover 11, the radiation within the lens, there is no coupling. However, once aqueous deposits P, e.g. a drop of water, create on the surface, the refractive index changes on the outer surface 10. Thereby, the radiation in the drops P is coupled out and absorbed there. This results in a radiation of the radiation energy, which is concentrated on the areas in which a deposition or filming of water or ice actually occurs. Thus, the invention achieves efficient utilization of the energy of the radiation R.
    The defrosting device T, Τ 'according to the invention can be activated as required, be switched on at the same time as the headlight and / or the vehicle are in operation, or be permanently in operation. For example, the defrost device can be switched on by the driver of the vehicle via an associated operating element. An automatic switching is possible, for example, triggered by a (not shown in the figures) sensor device that detects whether there are deposits on the cover of the headlamp. For example, in a headlamp system with a camera, the light image generated by the headlamp can be matched with a target image (the light distribution, brightness, or the like), and if a deviation (beyond a set threshold) is detected, the defrost device becomes for an adjustable period of time or activated until the desired target image is reached. Another efficient design is coupling to a temperature sensor that measures the temperature in the headlamp and / or in the area immediately in front of the cover, and the defrost device activates when the measured temperature is below a threshold, e.g. 0 ° C, lies; similarly, a humidity sensor may be used. Of course, combinations of the measures mentioned can also be provided for switching on / activating the defrosting device.
    权利要求:
    Claims (9)
    [1]
    claims
    1. headlight (S), in particular motor vehicle headlamp, comprising a housing (2) having an opening, at least one light source (5), and a cover plate device (1) which closes the opening and a cover plate (11) for the passage ( 7) of visible light from the light source, characterized by a defrosting device (T, Τ ') with a radiation emitter (12, 12') and a radiation coupling device (13, 13 '), wherein the radiation emitter (12, 12') generates Radiation (R) in the cover plate (11) through the radiation coupling device (13,13 ') can be fed, wherein the radiation within the cover (11) along an outer surface (10) of the cover is guided in a reflective manner.
    [2]
    2. Headlight according to claim 1, characterized in that the radiation emitter (12,12 ') of the light source (5) is arranged separately and preferably within the housing (2) of the headlamp.
    [3]
    3. Headlight according to claim 2, characterized in that the (at least one) light source (5) in a light module (4) for generating a predetermined light distribution in front of the headlight (1) is arranged, while the radiation emitter (12,12 ') outside of the light module (4) is arranged.
    [4]
    4. Headlight according to one of the preceding claims, characterized in that the radiation (R) is electromagnetic radiation of a non-visible light region, preferably IR radiation.
    [5]
    5. Headlight according to one of the preceding claims, characterized in that a radiation shielding screen (18) between the radiation emitter (12, 12 ') and the cover (11) is provided.
    [6]
    6. Headlight according to one of the preceding claims, characterized in that the radiation coupling device (13,13 ') is formed as a component of the cover disc device (1).
    [7]
    7. Headlight according to one of the preceding claims, characterized in that the radiation coupling device (13,13 ') is formed integrally with the cover plate (11).
    [8]
    8. Headlight according to one of the preceding claims, characterized in that the radiation emitter (12 ') is adapted to direct the radiation directly into the Strahlenseinkoppeleinrichtimg (13').
    [9]
    9. Headlight according to one of claims 1 to 7, characterized by optical components (15) which are arranged in the optical path between the radiation emitter (12) and the Strahlenseinkoppeleinrichtimg (13) and radiation (R) from the radiation emitter to the coupling device (13) ,
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    同族专利:
    公开号 | 公开日
    CN108317482A|2018-07-24|
    AT519473B1|2018-07-15|
    CN108317482B|2021-12-21|
    DE102017131441A1|2018-07-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2003066245A1|2002-02-01|2003-08-14|Metastable Instruments, Inc.|Method and apparatus for cleaning with electromagnetic radiation|
    DE102004022986A1|2004-05-10|2005-10-20|Kastriot Merlaku|Electronic heating system/window heating system for vehicles comprises a microwave radiator built into the vehicle and coupled with an energy supply to release intensive and heat-producing microwaves into the vehicle cabin|
    DE102011080488A1|2011-02-15|2012-08-16|Automotive Lighting Reutlingen Gmbh|Headlight for motor car, has infrared emitters arranged in housing for emitting infrared radiation in direction of cover plate that has maximum absorption coefficient for water, where light exit opening of housing is sealed by plate|
    DE102011001867A1|2011-04-07|2012-10-11|Hella Kgaa Hueck & Co.|Headlight for vehicle, particularly heavy duty truck, has unit formed by incandescent lamp as temperature radiator for defrosting lens cover, where light module with light emitting diode light source is gripped in headlight housing|
    DE102011079191A1|2011-07-14|2013-01-17|Osram Ag|Heatable glass disk i.e. windscreen, for use in e.g. passenger car, has total internal reflection-light conductor for displaying infrared light, and heating device comprising infrared light sources for linking emitted light into disk|
    JP2014104841A|2012-11-27|2014-06-09|Toyota Motor Corp|Defroster device|
    WO2016084008A1|2014-11-25|2016-06-02|Sabic Global Technologies B.V.|Method and device for heating a surface|
    CN105588062B|2016-03-16|2019-01-29|福建鸿博光电科技有限公司|A kind of composite automobile headlamp|US20210302006A1|2018-12-05|2021-09-30|Yi Deng|Heating unit for light sources, installation and control system thereof|
    DE102019117968A1|2019-07-03|2021-01-07|HELLA GmbH & Co. KGaA|Device for heating a cover of a vehicle|
    WO2021250272A1|2020-06-12|2021-12-16|Motherson Innovations Company Ltd.|Functional means for imaging device, lighting module, rear view devices, driving assistance system and vehicle|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50029/2017A|AT519473B1|2017-01-16|2017-01-16|HEADLIGHTS WITH DEFROSTING DEVICE|ATA50029/2017A| AT519473B1|2017-01-16|2017-01-16|HEADLIGHTS WITH DEFROSTING DEVICE|
    DE102017131441.5A| DE102017131441A1|2017-01-16|2017-12-29|Headlamp with defrosting device|
    CN201810029774.5A| CN108317482B|2017-01-16|2018-01-12|Headlight with frost and dew removing mechanism|
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