• 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:
    The invention relates to a monitoring device for monitoring the operating state of a laser vehicle headlamp (4), wherein the laser vehicle headlamp (4) at least one laser light source (5) and one from the laser light source (5) illuminable and thus excitable to the emission of visible light light conversion element ( 6), the monitoring device comprising at least one photosensitive device (3) and a comparison device (1), the photosensitive device (3) comprising an LED (D1) which is adapted to receive light received by the laser light source (5) to convert an electrical signal (UD) which is fed to the comparison device (1), wherein the comparison device (1) is set up to compare the electrical signal (UD) with a predefinable value and, depending on the result, makes an error signal (Uo) issue.
    公开号:AT518010A1
    申请号:T50907/2015
    申请日:2015-10-23
    公开日:2017-06-15
    发明作者:Hebenstreit Georg
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    MONITORING DEVICE FOR MONITORING THE OPERATING CONDITION OF ONE
    Laser-vehicle headlight
    The invention relates to a monitoring device for monitoring the operating state of a laser vehicle headlamp, wherein the laser vehicle headlamp comprises at least one laser light source and an illuminable by the laser light source and thus excitable to the emission of visible light light conversion element, wherein the monitoring device comprises at least one photosensitive device and a comparison device ,
    The invention further relates to a laser vehicle headlamp, comprising at least one laser light source and a light conversion element which can be excited to emit visible light, with at least one monitoring device according to the invention and a vehicle, in particular a motor vehicle, comprising at least one, preferably two laser vehicle headlamps according to the invention.
    In the operation of laser vehicle headlights, it may be necessary that they must be checked for their functionality in order to avoid the occurrence of dangerous situations. Such a situation could, for example, be the case if a light conversion element that is set up to convert laser light into visible light is damaged, as a result of which the light conversion is incomplete and laser light leaves the headlight unconverted. In order to detect such a fault condition, monitoring devices with photosensitive devices having photodiodes or phototransistors by means of which the spectrum of the light emitted by the laser headlamp is at least partially detected and by comparison with predetermined desired values are known from the prior art a faulty operating state can be deduced. In order to ensure a sufficiently sensitive detection of the laser light by the photodiodes and / or phototransistors, optical filters are typically used in the prior art, which are the photodiodes and / or phototransistors upstream and substantially transparent only in the wavelength range of the laser light and the laser light source are. This allows the sensitivity of the photodiodes and / or phototransistors to
    Detection of the laser light can be sufficiently increased so that detection of the aforementioned error conditions is possible.
    The use of photodiodes and / or phototransistors with the aid of upstream optical filters represents a considerable cost and complexity of components, by additional process steps and / or housing and / or other components are required. In addition, errors in the tuning of the filter and the photodiodes and / or phototransistors can be undermined.
    An object of the invention is to remedy the above-mentioned disadvantages and to provide a monitoring device which is inexpensive to implement and at the same time ensures reliable operation. This object is achieved with a monitoring device of the aforementioned type, in which according to the invention the light-sensitive device comprises an LED (light-emitting diode) which is adapted to convert light received by the laser light source into an electrical signal supplied to the comparison device, wherein the Comparing means is adapted to compare the electrical signal with a predetermined value and output depending on the result of the comparison of an error signal. The predetermined value may be a definable threshold. Depending on the type of electrical signal, this threshold value can be set meaningfully. For example, in the correct operating state of the laser vehicle headlight, the signal of the LED can be between 0 and 0.3V and, in the event of a fault, rise above 0.5V. The threshold could be 0.5 V in such a case. The use of an LED for detecting the light emitted by the laser light source, also referred to below as laser light, has the particular advantage that LEDs, in contrast to photodiodes or phototransistors, have a substantially narrowband frequency spectrum and thus already have a sufficiently high sensitivity for detecting the respective laser light , The use of additional optical filters can be omitted. The monitoring device according to the invention is thus robust and inexpensive.
    The light emitted by the laser light source is preferably blue light in a wavelength range between 420 and 520 nm. In principle, however, the laser light can be of any wavelength which is suitable for exciting a light conversion element for emitting visible light. For example, the laser light could be in one
    Wavelength range between 230 nm (nanometer) and 760 nm or just outside the visible range above or below the specified wavelength range. The light conversion element may typically be a so-called phosphorus converter (e.g., a phosphorus compound or a cerium doped YAG crystal, etc.).
    In particular, it can be provided that the comparison device comprises a comparator, which is set up to compare the electrical signal with a threshold value and to output the error signal when a threshold value is exceeded.
    In addition, it can be provided that the error signal is an electrical DC signal with a voltage level not equal to 0 V to ground. A failure of the voltage supply of the monitoring device would therefore not necessarily result in the output of an error signal. The term "ground" is understood to mean a zero potential or reference potential, to which signal and operating voltages are referred. In a vehicle, the ground potential typically corresponds to the negative terminal of the vehicle battery, which is usually electrically connected to the vehicle body.
    Alternatively, it can be provided that the error signal is an electrical DC signal with a voltage level equal to 0 V to ground. As a result, it can be ensured that an error signal can be output despite failure of the power supply of the monitoring device.
    In particular, it can be provided that the photosensitive device has at least one blue LED. A blue LED is understood to mean a light-emitting diode which is set up to emit blue light (for example in the wavelength range between 450 and 500 nm). Blue LEDs are suitable for measuring blue light, and therefore prove to be particularly advantageous in the use of laser light sources emitting blue light.
    In particular, it can be provided that the photosensitive device has at least two LEDs, wherein one of the LEDs is set up to measure the laser light and another of the LEDs is set up to measure the remaining light converted by the light conversion element. The use of two different light-emitting diodes enables a particularly accurate measurement of the light emitted by the laser vehicle headlight. The comparison device is preferably supplied with the signals of all LEDs and compared with one or more threshold values, it being possible to deduce the existence of a fault from the comparison depending on the result.
    The term "remaining, converted light" is understood to mean that light spectrum that is emitted by light conversion elements, reduced by the wave spectrum of the laser light.
    It may be particularly advantageous if the spectral sensitivity of the LED for measuring the laser light in the wavelength range of the laser light is maximum and the LED for measuring the remaining, converted by the light conversion element light has a spectral sensitivity whose maximum is reduced in the wavelength range of visible light lies around the wavelength range of the laser light.
    It can be provided in particular that the LED for measuring the laser light is a blue LED and the LED for measuring the remaining light converted by the light conversion element is a red LED. By a red LED is meant a light emitting diode adapted to emit red light (e.g., in the wavelength range between 610 and 760 nm). The combination of blue and red LEDs has been found to be particularly advantageous for monitoring laser vehicle headlamps having blue laser light diodes, since the sufficient spacing of the spectral sensitivity of the blue and red diode in the frequency band clear distinction between the laser light and the converted light is possible by using the signals output from the diodes.
    In addition, it can be provided that the at least two LEDs are connected in anti-parallel to each other. This can be given in a simple manner sufficient protection against electrostatic discharges (ESD). In addition, it is thereby possible that the light-emitting diodes lock each other depending on the output signal of the LED. For example, it may be favorable if the blue diode has an output signal with higher voltage, so that when both diodes become active, for example in a faulty state in which the light conversion takes place only partially, the blue diode blocks the red diode and thus a clearly recognizable output signal is delivered to the comparator.
    In particular, it can be provided that output signals of the LEDs output as a result of the measurements are supplied to the comparison device and compared with each other, and the error signal is determined in consideration of the output signals. For example, a quotient of the height of the output signal of the blue diode and the output signal of the red diode can be used as a parameter that can be used for comparison with a threshold value. In this way, erroneous misdetection caused by, for example, a high output signal of the blue LED and red LED can be caused by high overall light radiation (e.g., due to activated high beam or due to actuation of a high beam
    Lichthupenfunktion) could occur, are effectively prevented.
    A further aspect of the invention relates to a laser vehicle headlamp comprising at least one laser light source and a light conversion element activatable for emitting visible light, comprising at least one monitoring device according to the invention, wherein preferably the at least one LED of the light-sensitive device is an LED adapted to the spectrum of the laser light source.
    A light-emitting diode adapted to the spectrum of the laser light source is understood to mean a light-emitting diode which is suitable for detecting the light emitted by the laser light source with a spectral sensitivity which is increased in comparison with other wavelength ranges. For a blue laser light source is typically a blue LED, for a red laser light source, however, a red LED, etc. provided.
    In order to ensure an automatic shutdown in the presence of a faulty state, it can be provided that the laser vehicle headlight has a control unit connected to the comparator for driving the laser light source, wherein the control unit is adapted to deactivate the laser light source in the presence of the error signal , In a deactivated laser light source, the light emission is prevented by the laser light source.
    In a further aspect, the invention relates to a vehicle, in particular a motor vehicle, comprising at least one, preferably two, laser vehicle headlamps according to the invention. Although the laser vehicle headlight, as stated above, have a control unit for deactivating the laser light source. Alternatively, this control unit may also be provided on the vehicle and connected to the laser vehicle headlight or the laser light source.
    The invention is explained in more detail below with reference to an exemplary and non-limiting embodiment, which is illustrated in the figures. Show in it
    1 shows a schematic representation of a section of a laser vehicle headlamp according to the invention,
    FIG. 2 shows a schematic representation of a photosensitive device,
    FIG. 3 shows an exemplary electrical circuit diagram of a monitoring device according to the invention, and
    Figure 4 shows a time course of electrical signals of the monitoring device.
    In the following figures, unless otherwise stated, like reference numerals designate like features.
    1 shows a schematic representation of a detail of a laser vehicle headlight 4 according to the invention. In the present exemplary embodiment, the laser vehicle headlight 4 comprises a laser light source 5, a light conversion element 6 which can be illuminated by the laser light source 5 and thus excited for the emission of visible light, wherein between the light conversion element 6 and the laser light source 5 a lens 7 is arranged, a photosensitive device 3, a reflector 8 and a comparison device 1, which is adapted to compare the electrical signal with a predetermined value and output a result-dependent from the comparison of an error signal.
    The laser light source 5, the lens 7 and the light conversion element 6 are combined in the present case to a lighting device 2, which may be formed, for example, as built into a stand-alone housing component.
    The laser vehicle headlight 4 comprises a monitoring device according to the invention, which in turn has the aforementioned light-sensitive device 3 and the comparison device 1. The photosensitive device 3 is fixedly connected to the reflector 8 or accommodated in an opening of the reflector 8, which is preferably arranged in a position in which the laser light source 5 would shine predominantly in the absence of the conversion element 6. In particular, it can be provided that the side facing the light-emitting device 2 of the photosensitive device 3 has a light-absorbing surface to prevent unwanted reflection of laser light and thus an exit from the vehicle headlight in the event of a fault.
    Figure 2 shows a schematic representation of the photosensitive device 3. The device 3 comprises two LEDs, namely a blue LED Dl and a red LED D2, which are arranged in the present embodiment in a common housing 3a, but alternatively also be arranged in separate housings can. The housing 3a and the LEDs D1 and D2 are in turn electrically connected to a printed circuit board 3b, which in the present embodiment has a plug connection 3c for electrical connection to the comparison device 1 as well as boreholes 3d for mechanical connection to the reflector 8. The comparison device 1 or its electrical implementation could also be arranged directly on the printed circuit board 3b, whereby external connection components such as connection cables from the photosensitive device 3 to the comparison device 1, can be omitted. The connector 3c could then be set up for direct connection to a control unit in the vehicle.
    FIG. 3 shows an exemplary electrical circuit diagram of a monitoring device according to the invention. Therein, the comparison device 1 comprises a comparator 10 which is adapted to compare the electrical signal Ud, which is output by the anti-parallel connection of the diodes Dl and D2, with a threshold value Uref and, when the threshold value Uref is exceeded, to output an error signal that is present Example with the voltage level U0 in the state "high" (see Figure 4) equate.
    Alternatively, the error signal could also correspond to the low state to ground, for example 0 volts to ground.
    FIG. 4 shows a time profile of electrical signals of the monitoring device, more precisely of the signals Id, Ud, Uref and U0. In the following period "F" a malfunction of the laser vehicle headlamp was detected by the monitoring device, for example due to an exceeding of the threshold value Uref, whereby the diode current Id and the Output voltage Ud rises and the output signal U0 is switched to the logic state "high" (eg 5 V), thus providing a robust and cost-effective detection of error states.
    In view of this teaching, one skilled in the art will be able to arrive at other, not shown embodiments of the invention without inventive step. The invention is therefore not limited to the embodiment shown. Also, individual aspects of the invention or the embodiment can be taken up and combined with each other. Essential are the ideas underlying the invention, which can be performed by a person skilled in the knowledge of this description in a variety of ways and still remain maintained as such.
    权利要求:
    Claims (15)
    [1]
    claims
    1. Monitoring device for monitoring the operating state of a laser vehicle headlight (4), wherein the laser vehicle headlight (4) at least one laser light source (5) and one of the laser light source (5) illuminable and thus excitable to the emission of visible light light conversion element (6) wherein the monitoring device comprises at least one photosensitive device (3) and a comparison device (1), characterized in that the photosensitive device (3) comprises an LED (D1) which is adapted to receive light received by the laser light source (5) into an electrical signal (Ud), which is supplied to the comparison device (1), wherein the comparison device (1) is adapted to compare the electrical signal (Ud) with a predetermined value and, depending on the result of the comparison, an error signal (U0 ).
    [2]
    2. Monitoring device according to claim 1, characterized in that the comparison device (1) comprises a comparator (10) which is adapted to compare the electrical signal (Ud) with a threshold value (Uref) and when the threshold value (Uref) is exceeded. to output the error signal (U0).
    [3]
    3. Monitoring device according to one of the preceding claims, characterized in that the error signal (U0) is an electrical DC signal with a voltage level not equal to 0 V to ground.
    [4]
    4. Monitoring device according to one of the preceding claims, characterized in that the error signal (U0) is an electrical DC signal with a voltage level equal to 0 V to ground.
    [5]
    5. Monitoring device according to one of the preceding claims, characterized in that the photosensitive device (3) has at least one blue LED.
    [6]
    6. Monitoring device according to one of the preceding claims, characterized in that the photosensitive device (3) has at least two LEDs, wherein one of the LEDs for measuring the laser light is set up and another of the LEDs for measuring the remaining, from the light conversion element (6 ) converted light is set up.
    [7]
    7. Monitoring device according to claim 6, characterized in that the spectral sensitivity of the LED for measuring the laser light in the wavelength range of the laser light is maximum and the LED for measuring the remaining light converted by the light conversion element (6) has a spectral sensitivity whose maximum in Wavelength range of the visible light is reduced by the wavelength range of the laser light.
    [8]
    8. A monitoring device according to claim 7, characterized in that the LED for measuring the laser light is a blue LED and the LED for measuring the remaining light converted by the light conversion element (6) is a red LED.
    [9]
    9. Monitoring device according to one of claims 6 to 8, characterized in that the at least two LEDs are connected in anti-parallel to each other.
    [10]
    10. Monitoring device according to one of claims 6 to 9, characterized in that output as a result of the measurements output signals of the LEDs of the comparison device (1) are supplied and compared with each other and the error signal (U0) is determined taking into account the output signals.
    [11]
    11. Laser vehicle headlight, pointing to at least one laser light source (5) and a stimulable to the emission of visible light light conversion element (6), with at least one monitoring device according to one of the preceding claims.
    [12]
    12. Laser vehicle headlight (4) according to claim 11, characterized in that the at least one LED of the photosensitive device is an adapted to the spectrum of the laser light source (5) LED.
    [13]
    13. Laser vehicle headlight (4) according to claim 11 or 12, characterized in that the laser vehicle headlight (4) has a comparison device (1) connected to the control unit for driving the laser light source (5), wherein the control unit is adapted to to deactivate the laser light source (5) in the presence of the error signal (U0).
    [14]
    14. Vehicle, in particular motor vehicle, comprising at least one, preferably two laser vehicle headlights (4) according to claim 12 or 13.
    [15]
    15. Vehicle according to claim 14, characterized in that the vehicle has a comparator (1) connected to the control unit for driving the laser light source (5), wherein the control unit is adapted to the laser light source (5) in the presence of the error signal ( U0).
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50907/2015A|AT518010B1|2015-10-23|2015-10-23|Monitoring device for monitoring the operating state of a laser vehicle headlight and vehicle headlights|ATA50907/2015A| AT518010B1|2015-10-23|2015-10-23|Monitoring device for monitoring the operating state of a laser vehicle headlight and vehicle headlights|
    PCT/AT2016/060055| WO2017066815A1|2015-10-23|2016-09-13|Monitoring apparatus for monitoring the operating state of a laser vehicle headlamp|
    EP16770869.2A| EP3365196B1|2015-10-23|2016-09-13|Monitoring apparatus for monitoring the operating state of a laser vehicle headlamp|
    JP2018520462A| JP6591063B2|2015-10-23|2016-09-13|Monitoring device for monitoring the operating state of a laser vehicle projector|
    US15/769,374| US10569711B2|2015-10-23|2016-09-13|Monitoring apparatus for monitoring the operating state of a laser vehicle headlamp|
    CN201680061623.7A| CN108136961B|2015-10-23|2016-09-13|Monitoring device for monitoring the operating state of a laser vehicle headlight|
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