(51) Int. Cl.6: B60Q 1/115, B60Q 1/14
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`(71) Applicant: ROBERT BOSCH GMBH
` 70442 Stuttgart (DE)
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`(72) Inventors:
` • Cochard, Roland
` 1110 Morges (CH)
` • Lopez, Eladio
` 1602 La Croix (CH)
`
`(19)
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`Europäisches Patentamt
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`European Patent Office
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`Office europeén des brevets
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`(11) EP 0 949 118 A2
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`EUROPEAN PATENT APPLICATION
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`(12)
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`(43) Date of publication:
` 10/13/1999 Patent gazette 1999/41
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`(21) Application number: 99105575.7
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`(22) Filing date: 3/18/1999
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`
`
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`(84) Designated contracting states:
` AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU
` MC NL PT SE
`
` Named extension states:
`
` AL LT LV MK RO SI
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`
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`(30) Priority: 4/9/1998 DE 19815985
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`(54) Direction adjustment device for light beam emitted by at least one vehicle headlight
`
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`(57) The headlight (10) includes at least one
`the temporally varying intensity, and this light
`light source (14) which is operated at least
`portion is supplied to a processing unit (46)
`occasionally so as to allow temporal variation of
`which compares the current illumination situation
`the intensity of the light emitted therefrom. For
`with a given target illumination situation with
`example,
`the apparatus
`is
`to control
`the
`correctly adjusted illumination range. If there
`illumination range of the light beam emitted by
`exists a difference,
`the processing unit
`the headlight (10) and includes a sensor device
`generates an output signal
`to actuate an
`(20) which detects an illumination situation in
`adjustment device (18) associated with the
`front of the vehicle in terms of the light reflected
`headlight (10) which adjusts the inclination of the
`by the roadway. The sensor device (20) is
`headlight until the correct illumination range is
`connected with an
`input unit (44) of an
`set.
`evaluation device (42) which processes the
`
`illumination situation detected by the sensor
`
`device (20) regarding the light portion containing
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`UNIFIED PATENTS EXHIBIT 1019
`Page 1 of 11
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`EP 0 949 118 A2
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`1
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`Specification
`
`Background Art
`
`[0001] The invention is based on an apparatus
`for adjusting the direction of a light beam emitted
`by at least one headlight of a vehicle according to
`the preamble of claim 1.
`[0002] Such an apparatus
`from
`is known
`DE 41 22 531 A1 in the form of an apparatus for
`controlling the illumination range of the light beam
`emitted by at least one headlight of a vehicle.
`This apparatus includes an adjustment device
`associated with the headlight by means of which
`the
`illumination
`range may be adjusted.
`Additionally, the apparatus includes at least one
`optoelectronic sensor device which detects an
`illumination situation in form of the light emitted by
`the headlight and reflected by the roadway in
`front of the vehicle. Finally, the apparatus also
`includes an evaluation device connected to the
`sensor device and the adjustment device which
`compares
`the current
`illumination situation
`detected by the sensor device with stored data of
`a target illumination situation. If there exists a
`difference between
`the
`illumination situation
`currently detected by the sensor device and the
`target
`illumination situation according
`to
`the
`stored data, the evaluation device controls the
`adjustment device such that the difference is
`eliminated or at least minimized. However, the
`sensor device not only detects the light emitted by
`the headlight of the vehicle and reflected by the
`roadway, but also light originating from other light
`sources and reflected by
`the roadway. For
`example, this light may be emitted by headlights
`of other vehicles or by street lighting and leads to
`inaccuracies of the adjustment of the illumination
`range of the headlight.
`
`Advantages of the Invention
`
`[0003] The apparatus for adjusting the direction
`of the light beam emitted by at least one headlight
`according to the invention has the advantage,
`that the light emitted by the headlight of the
`vehicle differs in terms of its temporally varying
`nature from the light originating from other light
`sources, and
`thus
`the
`illumination situation
`detected by the at least one sensor device is
`evaluated specifically regarding this portion of the
`light. The adjustment of the direction of the light
`beam emitted by the headlight may thus be
`performed with high accuracy, because it is not
`affected by light originating from other light
`sources.
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`[0004] The
`specify
`claims
`dependent
`advantageous embodiments and developments
`of the apparatus according to the invention for
`adjusting the direction of the light beam emitted
`by at least one headlight. The embodiment of
`claim 3 allows the intensity of the light emitted by
`the light source to be time modulated in a simple
`manner. The embodiment of claim 8 ensures that
`the time modulated light emitted by the light
`source is at least processed in an essentially
`targeted manner.
`
`Figures
`
`[0005] Several exemplary embodiments of the
`invention are shown
`in
`the drawings and
`discussed in detail in the description below.
`Figure 1 shows a vehicle having headlights
`illuminating the roadway in front of the vehicle,
`Figure 2 shows a schematic diagram of an
`apparatus to control the illumination range of the
`headlights of the vehicle, Figure 3 shows the
`intensity of a constant light portion emitted by a
`light source of a headlight as a function of time,
`Figure 4 shows the intensity of the variable light
`portion emitted by the light source as a function of
`time, and Figure 5 shows the superposition of the
`constant and the variable light portions emitted by
`the light source as a function of time.
`
`Description of Exemplary Embodiments
`
`[0006] A vehicle depicted in Figure 1, which is
`preferably a motor vehicle, includes in known
`fashion two low beam headlights 10 at its front
`end that are attached to the body of the vehicle.
`The low beam headlights 10 may only serve to
`generate low beam light or may be embodied as
`combined low beam and high beam headlights for
`selectively generating low beam light or high
`beam light. Each low beam headlight 10 includes
`a reflector 12 into which at least one light source
`14 is inserted. The low beam headlight 10 as a
`whole, or at least its reflector 12, can be pivoted
`about an axis 16 extending approximately
`horizontally and/or an axis 17 extending
`approximately vertically. By pivoting the low beam
`headlight 10 or its reflector 12, respectively, about
`the horizontal axis 16 the direction of the light
`beam emitted therefrom can be modified in a
`vertical plane and thus the illumination range of
`the light beam emitted by the low beam headlight
`can be modified. By pivoting the low beam
`headlight 10 or its reflector 12, respectively, about
`the vertical axis 17 the direction of the light beam
`emitted therefrom can be modified in a horizontal
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`EP 0 949 118 A2
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`[0009] Figure 2 shows a simplified schematic of
`plane and thus the path of the light beam can be
`modified
`in a
`lateral direction. Thereby,
`for
`the device for controlling the illumination range.
`example, the direction of the light beam emitted
`The device includes at least one optoelectronic
`by the low beam headlight 10 may be adapted to
`sensor device 20. Only one common sensor
`the path of the roadway in front of the vehicle, in
`device 20 may be provided for both low beam
`particular when cornering, to achieve sufficient
`headlights 10, or one sensor device 20 each may
`illumination of the roadway.
`be provided for each low beam headlight 10. The
`[0007] The following is an exemplary description
`sensor device 20 detects the illumination situation
`of the adjustment of the direction of the light
`in front of the vehicle in terms of the light reflected
`beam emitted by the low beam headlight 10 in a
`by the roadway in front of the vehicle. The sensor
`vertical plane and thus the adjustment of the
`device 20 includes a plurality of discrete light-
`illumination range of the light beam emitted by the
`sensitive elements 22 that are, for example, be
`low beam headlight. Each low beam headlight 10
`embodied as photo cells, photo diodes, photo
`has an associated adjustment device 18 by
`transistors, or CCD (charge-coupled device). The
`means of which the entire headlight or at least its
`light-sensitive elements 22 are arranged in a
`reflector 12 can be pivoted about the axis 16.
`matrix-like or linearly distributed fashion. The
`Preferably,
`the adjustment devices 18 may
`sensor device 20 may also include only one light-
`include an electric motor as a drive which moves
`sensitive element which has a one-dimensional
`an adjustment member hinged to the headlight 10
`linear extension or a two-dimensional planar
`or its reflector 12 via a gear. Alternatively, the
`extension, wherein the light impinging on sub-
`adjustment devices 18 may also be actuated by
`areas of the element may be detected separately
`hydraulic, pneumatic or electromagnetic means.
`for each sub-area. The light-sensitive element
`[0008] In operation, the low beam headlights 10
`may here be embodied as a PSD (photo sensing
`emit light beams which illuminate the area in front
`device). The image 23 of the illumination situation
`of the vehicle. Figure 1 illustrates the light beams
`is divided into a plurality of sub-areas 24 in grid-
`by means of a plurality of
`lines of equal
`like manner, wherein
`the sensor device 20
`illuminance, so-called isolux lines 20. The light
`detects the illuminance present in each sub-area
`beams have a greater range on the side of their
`24. Additionally, the sensor device 20 includes
`own travel, in the depicted embodiment for right-
`imaging optics, for example in form of a lens 26
`hand traffic the right side of traffic, than on the
`which images incident light onto the light-sensitive
`side of oncoming traffic. Due to the arrangement
`element(s) 22. The illuminances detected for the
`of the low beam headlights 10 on the vehicle
`various sub-areas 24 may be read out of the
`body, the inclination of the low beam headlights
`sensor device 20 in chronological sequence one
`10 relative to the roadway changes with the
`after the other for the light-sensitive elements 22
`inclination of the vehicle body. A change in
`associated with these sub-areas 24. If the light-
`inclination of
`the vehicle body occurs,
`for
`sensitive elements 22 are arranged linearly, they
`example, with changing vehicle load, during
`are moved to determine the illuminances in each
`acceleration or braking maneuvers of the vehicle,
`of the sub-areas 24 in order to allow all sub-areas
`or when traversing bumps in the roadway. The
`24 of the image 23 to be recorded. Thereby the
`change in inclination of the low beam headlights
`incident light may be detected in each position of
`10 also leads to a change of their range of
`the elements 22 for sub-areas 24 arranged in a
`illumination, in the sense that the range of
`row or a column, and then the elements 22 are
`illumination increases in case of deflection of the
`moved further, so that the incident light of sub-
`rear axle and the range of illumination decreases
`areas 24 arranged in an adjacent row or column
`in case of deflection of the front axle. An increase
`may be detected. The sensor device 20 is
`in the range of illumination leads to blinding of
`preferably positioned at the low beam headlight
`oncoming traffic, whereas a decrease in the
`10 such that the device can be pivoted together
`range of illumination leads to a decrease of the
`with the low beam headlight 10 or its reflector 12
`visibility range of the vehicle operator. In order to
`about the axis 16 by means of the adjustment
`compensate for the change in illumination range
`device 18.
`[0010] The light source 14 of the low beam
`of the low beam headlights 10 caused by the
`change in inclination of the vehicle body, a device
`headlight 10 is preferably a discharge lamp, for
`for controlling the range of illumination is provided
`the operation of which an electric ballast 30 is
`which keeps the range of illumination at least
`provided. The ballast 30 includes an ignition
`approximately constant and which is discussed in
`device which generates
`the high voltage
`more detail below.
`necessary for starting the discharge lamp 14. In
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`EP 0 949 118 A2
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`addition, the ballast 30 includes an operating
`temporal resolution, wherein the variations in
`device 32
`for continuous operation of
`the
`intensity I(t) with the fundamental frequency f0
`discharge lamp 14, including, but not restricted to
`and the frequency f1 are superimposed over one
`a converter 34 for generating alternating current
`another. Figure 5 depicts the period t0 of the
`and alternating voltage, which are supplied to the
`fundamental frequency f0 and the period t1 of the
`discharge lamp 14, from the direct current and the
`frequency t1 caused by the control device 38.
`direct voltage supplied by the battery 36 on board
`During one period t1 of the frequency f1 there is a
`of the vehicle.
`plurality of periods
`t0 of
`the
`fundamental
`[0011] Connected to the operating device 32, in
`frequency f0.
`[0013] The amplitude Imax of the intensity I(t) is
`particular to its converter 34, is a control device
`38 which controls the flow of the alternating
`varied by the control device 38 with the frequency
`current and the alternating voltage supplied to the
`f1 between a first, higher value I1 and a second,
`discharge lamp 14 by the converter 34 at least
`lower value I2. Between the two values I1 and I2,
`intermittently. The flow of the electric current and
`the intensity I(t) may fall to zero for very short
`voltage or
`the electric power,
`respectively,
`time periods. The frequency f1 of the temporal
`supplied to the discharge lamp 14 is temporally
`variation of the intensity I(t) caused by the control
`varied by
`the control device 38 at
`least
`device 38 may be constant or vary over time. The
`intermittently, such that the intensity of the light
`difference of the amplitudes I1 and I2 may also be
`emitted by
`the discharge
`lamp 14 varies
`constant or vary over time. In order to achieve a
`correspondingly as a
`function of
`time
`in
`characteristic time-dependent variation of the
`characteristic manner as specified by the control
`intensity I(t) of the light emitted by the discharge
`device 38. Preferably, the converter 34 supplies
`lamp 14, for example, the control device 38 may
`an alternating current or an alternating voltage
`also cause a phase modulation of the alternating
`with a specific fundamental frequency and a
`current and
`the alternating voltage
`that
`is
`specific fundamental amplitude to the discharge
`supplied to the discharge lamp 14.
`[0014] A clock device 40 is connected to the
`lamp 14 as suitable for stable operation of the
`discharge lamp 14. The control device 38 then
`control device 38 and also connected to the
`varies
`the alternating current and/or
`the
`sensor device 20. The clock device 40
`alternating voltage supplied to the discharge lamp
`synchronizes the operation of the sensor device
`14 over time with one or more of a specific
`20 with the temporal variation of the characteristic
`frequency, amplitude, and phase based on the
`of the light emitted by the discharge lamp 14, that
`fundamental
`frequency and
`the
`fundamental
`is, the sensor device 20 detects the illumination
`amplitude. Here, the fundamental frequency and
`situation in front of the vehicle during the time
`the fundamental amplitude are preferably larger
`periods, during which the control device 38
`than the temporal variation of the frequency and
`modulates the intensity of the light emitted by the
`amplitude of the alternating current and/or the
`discharge lamp 14. The sensor device 20 is
`alternating voltage caused by the control device
`operated synchronized with the time varying
`38.
`characteristic of the intensity of the light emitted
` [0012] Figure 3 shows the intensity I(t) of the
`by the discharge lamp 14 at each respective point
`light emitted by the discharge lamp 14 as a
`in time. The clock device 40 may also control the
`function of time, if the discharge lamp 14 is
`movement of the linearly arranged light-sensitive
`supplied with an alternating current and/or an
`element(s) 22 of the sensor device 20 that is
`alternating voltage with constant fundamental
`necessary in order to detect the incident light in
`frequency and constant fundamental amplitude.
`all sub-areas 24 of
`the
`image 23 of
`the
`Here, the intensity I(t) varies according to the
`illumination situation.
`[0015] The sensor device 20 is connected to an
`fundamental frequency of the current or the
`voltage around an average value I0 which is
`evaluation device 42 which will be described
`determined by the amplitude of the supplied
`below. The evaluation device 42 includes an input
`current or voltage, respectively. Figure 4 shows
`unit 44 which is connected to the sensor device
`the intensity I(t) of the light emitted by the
`20 and the clock device 40. The input unit 44 is in
`discharge lamp 14 as a function of time, with a
`turn connected to a processing unit 46. The input
`temporal variation caused by the control device
`unit 44 transfers the signals provided by the
`38. The intensity I(t) according to Figure 4 varies
`sensor device 20 synchronized with the temporal
`with a
`frequency
`that
`is
`lower
`than
`the
`variation of the intensity of the light emitted by the
`fundamental
`frequency. Figure 5 shows
`the
`discharge lamp 14 caused by the control device
`intensity I(t) as a function of time with greater
`38 to the processing unit 46. The synchronization
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`of the transfer of the signals from the sensor
`deviation of the current illumination range from
`device 20 to the processing unit 46 by the input
`the target illumination range. The difference E(t,α)
`unit 44 is ensured by means of its connection to
`depends on the angle of inclination α(t) of the
`the clock device 40. Transferring the signals of
`headlight 10 relative to the roadway which in turn
`the sensor device 20 synchronized with the
`is a function of time. In order to determine the
`temporal variation of the intensity of the light
`difference E(t,α), the processing unit 46 applies
`emitted by the discharge lamp 14 achieves that
`known correlation methods.
`[0018] The processing unit 46 generates an
`the portion of the light detected by the sensor
`device 20 originating from the discharge lamp 14
`output signal which drives the adjustment device
`is amplified and substantially only this light portion
`18 of the headlight 10 via a correction unit 50.
`is processed. External light originating from other
`The output signal of the processing unit 46 is
`light sources, for example from headlights of
`such that the adjustment device 18 is controlled
`other vehicles or from street lighting, is not
`such that the inclination α of the headlight 10 or
`synchronized
`or
`statistically
`correlated,
`its reflector 12, respectively, is changed such that
`respectively, with the temporal variation of the
`the light beam emitted by the headlight 10 has
`intensity of the light emitted by the discharge
`the given target illumination range and thus the
`lamp 14 and is thus filtered out by the input unit
`difference E(t,α) determined by the processing
`44 and not transferred or only transferred to a
`unit 46 becomes zero or is at least minimized.
`small extent to the processing unit 46. The input
`When
`the headlight 10 or
`its reflector 12,
`unit 44 thus transfers an image of the illumination
`respectively, pivots, the sensor device 20 pivots
`situation in front of the vehicle to the processing
`with it about the axis 16 as well.
`[0019] The correction unit 50 may be supplied
`unit 46, which image substantially only contains
`the portion of the illumination which is caused by
`with other signals other than the output signal of
`the light originating from the headlight 10.
`the processing unit 46, for example with one or
`[0016] In addition to the input unit 44, the
`more of signals about weather conditions such as
`processing unit 46 is connected to a memory unit
`rain or fog, the velocity of the vehicle, the
`48 as well which stores data about at least one
`acceleration of the vehicle, the speed of the motor
`image of the illumination situation in front of the
`of the vehicle, and signals of a controller of an
`vehicle as is present when the illumination range
`automatic
`transmission of
`the vehicle. The
`of the headlight 10 is set correctly. In the sub-
`correction unit 50 checks the output signal of the
`areas 24 of the image 23 of the illumination
`processing unit 46 for plausibility, that is, whether
`situation
`in
`front of
`the vehicle certain
`the output signal for driving the adjustment device
`illuminances are present when the illumination
`18 can lead to a correct adjustment of the
`range is set correctly, and a certain distribution of
`illumination range considering the information
`illuminances over the various sub-areas 24 is
`available to the correction unit 50 due to the
`present. The memory unit 48 may store data of
`additional signals. The correction unit 50 may
`various images of the illumination situation in front
`also estimate a reliability of the output signal of
`of the vehicle as they are detected by the sensor
`the processing unit 46 considering the available
`device 20, for example, under different weather
`additional information, for example the weather
`conditions, in case of dry or wet roadways or on
`conditions, and, depending on the reliability,
`different road surfaces. The data stored in the
`correct the signal. For this, the correction unit 50
`memory unit 48 are determined under actual
`may employ, for example, methods involving
`illumination of the roadway in front of the vehicle
`fuzzy logic.
`[0020] The time variation of the intensity of the
`by means of the headlight 10 and via detection of
`the illumination situation by the sensor device 20.
`light emitted by the discharge lamp 14 caused by
` [0017] The processing unit 46 compares the
`the control device 38 is preferably in terms of
`current data Ix(t,α), transferred to it by the input
`amplitude and frequency such that it is not
`unit 44, of the image of the illumination situation
`observable by the human eye and thus the
`generated by the sensor device 20 with the data
`illumination of
`the roadway
`for
`the vehicle
`Is(αs) present in the memory unit 48. The current
`operator is not compromised. It may be provided
`data Ix depend on time t and the inclination of the
`at each low beam headlight 10 that the intensity
`headlight 10 or of its reflector 12, respectively,
`of the light emitted by its light source 14 is
`relative to the roadway and the data Is represent
`modulated and that a sensor device 20 and an
`a target value. When comparing the data, the
`evaluation device 42 is associated with each low
`processing unit 46
`forms
`the difference
`beam headlight 10, wherein the illumination range
`E(t,α) = Is(αs) - Ix(t,α), which is a measure of the
`of each of the two low beam headlights may be
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`other.
`each
`of
`independently
`adjusted
`Alternatively, it may be provided that one sensor
`device 20 is associated with each low beam
`headlight 10 and is connected to a common
`evaluation device 32. Alternatively, it may further
`be provided at one low beam headlight 10 that
`the intensity of the light emitted by its light source
`14 is modulated and a sensor device 20 and an
`evaluation device 42 is associate only with this
`low beam headlight 10. Here, the adjustment
`device 18 of the other low beam headlight 10 may
`be driven by the output signal of the evaluation
`device 42 as well. In this case, however, it must
`be ensured that the angles of inclination α of both
`low beam headlights 10 are the same.
`[0021] Instead of a discharge lamp 14, the low
`beam headlight 10 may also include one or more
`other light sources, for example semiconductor
`light sources in the form of light emitting diodes,
`where the intensity of the light emitted by these
`may be controlled by means of a control device
`38. Analogous
`to
`the adjustment of
`the
`illumination range of the light beam emitted by the
`low beam headlight 10 explained above, in
`addition or alternatively to the adjustment of the
`illumination range by means of the sensor device
`20, the evaluation device 42 and the control
`device 30, also the direction of the light beam
`emitted by the low beam headlight may be
`adjusted in a horizontal plane by means of an
`additional adjustment device, by means of which
`the low beam headlight 10 or at least its reflector
`12, respectively, may be pivoted about
`the
`vertical axis 17. Here, the evaluation device 42
`may be connected, for example, with another
`sensor device which detects the path of the
`roadway in front of the vehicle such that the
`direction of the light beam emitted by the low
`beam headlight 10 may be adjusted according to
`the path of the roadway. A satellite navigation
`device of the vehicle, in which data about the
`path of the roadway are stored and which detects
`the current position of the vehicle in the roadway,
`may here serve as
`the sensor device,
`for
`example.
`
`Claims
`
`
`4. The apparatus of claim 3, characterized in
`that the current supplied to the light source
`(14) by the electrical supply (30) is time
`modulated as
`the electrical operating
`parameter thereof.
`
`
`5. The apparatus of claim 3 or 4, characterized
`in that the voltage supplied to the light source
`(14) by the electrical supply (30) is time
`modulated as
`the electrical operating
`parameter thereof.
`
`
`6. The apparatus of any one of claims 3 to 5,
`characterized in that a control device (38) is
`provided which operates on the supply (30)
`for effecting the time modulation of the at
`least one electrical operating parameter.
`
`
`
`
` 10
`sensor device
`(20) which detects an
`illumination situation in terms of the light
`emitted by the headlight (10) and reflected by
`the roadway in front of the vehicle, and an
`evaluation device (42) which compares the
`current illumination situation detected by the
`sensor device (20) with at least one target
`illumination situation with a correctly adjusted
`direction of the light beam emitted by the
`headlight (10) and, in case of an existing
`difference between the current illumination
`situation and the target illumination situation,
`controls
`the adjustment device
`(18)
`to
`minimize the difference, characterized in that
`the light emission of the headlight (10) is time
`modulated at least occasionally and that the
`evaluation device (42) evaluates essentially
`only the time modulated portion of the current
`illumination situation detected by the sensor
`device (20).
`
`
`2. The apparatus of claim 1, characterized in
`that the intensity of the light emitted by the at
`least one light source (14) is time modulated.
`
`
`3. The apparatus of claim 2, characterized in
`that an electrical supply (30) is provided for
`the at least one light source (14) and for time
`modulating of the intensity of the light emitted
`by the at least one light source (14) an
`electrical operating parameter of the supply
`(30) is time modulated.
`
`
`
`
`
` 5
`
`
`
`
`
`
`
`10
`
`
`
`
`15
`
`
`
`
`20
`
`
`
`
`25
`
`
`
`
`30
`
`
`
`
`35
`
`
`
`
`40
`
`
`
`
`45
`
`
`
`
`50
`
`
`
`
`55
`
`
`
`
`
`
`1. Apparatus for adjusting a direction of a light
`beam emitted by at least one headlight of a
`vehicle, wherein the headlight (10) includes at
`least one light source (14), comprising an
`adjustment device (18) associated with the
`headlight (10) by means of which the direction
`of the light beam emitted by the headlight (10)
`may be changed, at least one optoelectronic
`
`UNIFIED PATENTS EXHIBIT 1019
`Page 6 of 11
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`

`

`EP 0 949 118 A2
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` 12
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` 5
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`
`
`
`
`
`
`10
`
`
`
`
`15
`
`
`
`
`20
`
`
`
`
`25
`
`
`
`
`30
`
`
`
`
`35
`
`
`
`
`40
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`
`
`
`45
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`
`
`
`50
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`
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`55
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`
`11
`
`
`7. The apparatus of any one of claims 2 to 6,
`characterized in that the at least one light
`source (14) is operated with a given base
`intensity (I0) superimposed with a temporal
`intensity variation (I(t)).
`
`
`8. The apparatus of any one of the preceding
`claims, characterized in that the detection of
`the illumination situation by the at least one
`sensor device (20) and the processing thereof
`by the evaluation device (42) is performed
`synchronously with the time modulation of the
`light emission of the headlight (10).
`
`
`9. The apparatus of any one of the preceding
`claims, characterized in that the at least one
`light source (14) is a discharge lamp.
`
`
`10. The apparatus of any one of claims 1 to 8,
`characterized in that the at least one light
`source (14) is a semiconductor light source.
`
`
`
`UNIFIED PATENTS EXHIBIT 1019
`Page 7 of 11
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`

`

`EP 0 949 118 A2
`EP 0 949 118 A2
`
`FIG. 1
`
`UNIFIED PATENTS EXHIBIT 1019
`Page 8
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`UNIFIED PATENTS EXHIBIT 1019
`Page 8 of 11
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`

`

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`
`EP 0 949 118 A2
`
`UNIFIED PATENTS EXHIBIT 1019
`Page 9 of 11
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`

`

`EP 0 949 118 A2
`EP 0 949 118 A2
`
`,
`
`CECcee
`
`CO —_—= t[s]
`
`
`
`
`
`
`
`UNIFIED PATENTS EXHIBIT 1019
`Page 10 of 11
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`UNIFIED PATENTS EXHIBIT 1019
`Page 10 of 11
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`

`

`EP 0 949 118 A2
`EP 0 949 118 A2
`
`
`
`
`
`UNIFIED PATENTS EXHIBIT 1019
`Page 11 of 11
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`UNIFIED PATENTS EXHIBIT 1019
`Page 11 of 11
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`