Abstract
An additional lighting device for mounting on a two-wheeled vehicle in addition to a lighting device of the two-wheeled vehicle is designed such that it can be mounted on the two-wheeled vehicle by a mounting means in a specified position relative to the lighting device. The additional lighting device can be mounted in the specified position on the two-wheeled vehicle in such a way that the additional lighting device can illuminate an additional illumination area which is spatially specified relative to an illumination area of the lighting device. Also provided is use of a lighting device as additional lighting device on a two-wheeled vehicle in addition to a lighting device of the two-wheeled vehicle, and a two-wheeled vehicle with the additional lighting device.
Claims
1. An additional lighting device for mounting on a two-wheeled vehicle in addition to a lighting device (22; 22; 322;
422. of the two-wheeled vehicle, wherein: the additional lighting device is configured such that it can be mounted on the two-wheeled vehicle in a location predefined with respect to the lighting device by a mounting means; and the additional lighting device can be mounted on the two-wheeled vehicle in the predefined location by means of the mounting means such that an additional illumination zone can be illuminated by the additional lighting device and is spatially predefined with respect to an illumination zone of the lighting device.
2. The additional lighting device in accordance with claim 1, wherein: the additional lighting device comprises the mounting means; and the mounting means is configured such that it can cooperate with a mounting device of the two-wheeled vehicle such that the additional lighting device can be mounted in the predefined location.
3. The additional lighting device in accordance with claim 2, wherein the mounting device is formed at a frame component of the two-wheeled vehicle, in particular at a frame component of the two-wheeled vehicle.
4. The additional lighting device in accordance with claim 2, wherein the mounting means is formed as an element of a two-wheeled vehicle component releasably connectable to a frame component of the two-wheeled vehicle.
5. The additional lighting device in accordance with claim 4, wherein the two-wheeled vehicle component has a stop element for bounding an angle lock of handlebars of the two-wheeled vehicle.
6. The additional lighting device in accordance with claim 2, wherein the mounting device is formed at a steering device of the two-wheeled vehicle, in particular at a brake fitting of the two-wheeled vehicle arranged at handlebars of the steering device.
7. The additional lighting device in accordance with claim 1, wherein the additional illumination zone is spatially predefined such that a main beam axis of the additional lighting device is oriented in the direction of a road surface that can be ridden by the two-wheeled vehicle.
8. The additional lighting device in accordance with claim 1, wherein the additional illumination zone is spatially predefined such that a main beam axis of the additional lighting device is arranged substantially perpendicular to a direction of travel of the two-wheeled vehicle.
9. The additional lighting device in accordance with claim 1, wherein the additional illumination zone is spatially predefined such that a main beam axis of the additional lighting device extends in the direction of a contact surface of the front wheel of the two-wheeled vehicle.
10. The additional lighting device in accordance with claim 8, wherein the main beam axis differs up to an angle of a maximum of 30, in particular of a maximum of 20, from a substantially perpendicular arrangement with respect to the direction of travel and/or from an extent in the direction of the contact surface.
11. The additional lighting device in accordance with claim 1, wherein the additional illumination zone is spatially predefined with respect to the illumination zone of the lighting device such that the illumination zone and the additional illumination zone contact one another.
12. The additional lighting device in accordance with claim 1, wherein the additional illumination zone is spatially predefined with respect to the illumination zone of the lighting device such that the illumination zone and the additional illumination zone at least regionally overlap one another.
13. The additional lighting device in accordance with claim 12, wherein the illumination zone and the additional illumination zone overlap in a region of a maximum of 33%, in particular a maximum of 25%, of the area of the additional illumination zone.
14. The additional lighting device in accordance with claim 1, wherein the additional illumination zone spatially comprises the illumination zone.
15. The additional lighting device in accordance with claim 1, wherein the illumination zone and the additional illumination zone are illuminated in accordance with a predefined common geometrical arrangement.
16. Use of a lighting device as an additional lighting device on a two-wheeled vehicle in addition to a lighting device of the two-wheeled vehicle, wherein: the lighting device used is arranged on the two-wheeled vehicle in a location predefined with respect to the lighting device; and the additional lighting device used is arranged on the two-wheeled vehicle such that an additional illumination zone can be illuminated by the lighting device used and is spatially predefined with respect to an illumination zone of the lighting device.
17. Use of a lighting device as an additional lighting device in accordance with claim 16, wherein the lighting device used is arranged on the two-wheeled vehicle such that the additional illumination zone can be illuminated in the form of at least one ellipse projected onto a road surface that can be ridden by the two-wheeled vehicle.
18. A two-wheeled vehicle, in particular a bicycle, having an additional lighting device in accordance with claim 1.
19. The two-wheeled vehicle in accordance with claim 18, wherein: the additional lighting device comprises an environmental light sensor for detection of an environmental brightness of the additional lighting device; and the additional lighting device comprises a control device that is configured to control the additional lighting device in dependence on the detected environmental brightness to illuminate the additional illumination zone based thereon.
20. The two-wheeled vehicle in accordance with claim 18, wherein: the additional lighting device comprises a motion sensor for detection of a movement in the environment of the additional lighting device; and the additional lighting device comprises a control device that is configured to control the additional lighting device in dependence on the detected movement to illuminate the additional illumination zone based thereon.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 schematically shows a two-wheeled vehicles with an additional lighting device in accordance with an embodiment of the invention;
[0031] FIG. 2 schematically shows a two-wheeled vehicle with an additional lighting device in accordance with a further embodiment of the invention;
[0032] FIGS. 3a-e show different spatial aspects of additional illumination zones with respect to predefined illumination zones;
[0033] FIG. 4a schematically shows a section of a steering device of a two-wheeled vehicle with an additional lighting device in accordance with a further embodiment of the invention;
[0034] FIG. 4b schematically shows the steering device of FIG. 4a in a frontal view in accordance with a further embodiment of the invention;
[0035] FIG. 5a schematically shows a frame component of a two-wheeled vehicle with an additional lighting device in accordance with a further embodiment of the invention;
[0036] FIG. 5b schematically shows a stop element arranged at the frame component of FIG. 5a with an additional lighting device in accordance with a further embodiment of the invention;
[0037] FIG. 6 schematically shows a two-wheeled vehicle with an additional lighting device in accordance with a further embodiment of the invention; and
[0038] FIG. 7 schematically shows a two-wheeled vehicle with an additional lighting device in accordance with a further embodiment of the invention;
DETAILED DESCRIPTION OF THE INVENTION
[0039] FIG. 1 shows a two-wheeled vehicle in the form of a bicycle 10. The two-wheeled vehicle 10 has a front wheel 12, a rear wheel 14, a frame 16, and a steering device 18. A lighting device 22 is arranged at the steering device 18. The lighting device 22 is configured as a front headlamp of the bicycle 10 in FIG. 1. The lighting device 22 is configured to illuminate an illumination zone 30. The illumination zone 30 is a surface section 32 of a road 34 that is illuminated by a light cone 36 generated by the lighting device 22. In other words, the surface section 32 of the road 34 is illuminated by the lighting device 22. Bumps 38a and/or obstacles 38b on the road 34 that are within the light cone 36 can hereby be better recognized by a rider of the two-wheeled vehicle 10.
[0040] In accordance with the embodiment of FIG. 1, an additional lighting device 24 is mounted on a frame component 16a of the frame 16 of the two-wheeled vehicle 10 by means of a mounting means 20. The additional lighting device 34 is configured as an additional headlamp of the two-wheeled vehicle 10 and can be subsequently attached to the frame component 16a of the frame 16 of the two-wheeled vehicle 10 by means of the mounting means 20. The additional lighting device 24 is attached to the frame component 16a of the frame 16 of the two-wheeled vehicle 10 such that the additional lighting device 24 illuminates an additional illumination zone 40. The additional illumination zone 40 is a further surface section 42 of the road 34 that is illuminated by a light cone 46 generated by the additional lighting device 24. In other words, the further surface section 42 of the road 34 is illuminated by the additional lighting device 24. The additional illumination zone 40 here also comprises a contact surface 44 of the front wheel 12, that is a section of the road 34 that is in contact with the front wheel 12. It is possible by means of the additional lighting device 24 to recognize bumps 48a and/or obstacles 48b within the illumination zone 40 that are located in front of the front wheel 12 on the road 34.
[0041] As can be seen from FIG. 1, the illumination zone 30 is arranged in front of the additional illumination zone 40 in the direction of travel F of the two-wheeled vehicle 10. When traveling in the direction of travel F, the illumination zone 30 is accordingly first illuminated by the lighting device 22. The additional illumination zone 40 is furthermore first illuminated by the additional lighting device 24. If the two-wheeled vehicle 10 continues to move forward in the direction of travel F, the illumination zone 30 is illuminated by the additional lighting device 24 at a later point in time. At this point in time, a further illumination zone located in front of the illumination zone 30 in the direction of travel F is already illuminated by the lighting device 22. The additional illumination zone 40 is thus spatially predefined with respect to the illumination zone 30 such that the surface section 32 of the road 34 is respectively illuminated in consecutive time periods once by the lighting device 22 and once by the additional lighting device 24. Bumps 38a, 48a and/or obstacles 38b 48b on the road can thus be better recognized.
[0042] As can be seen from the representation of FIG. 1, the illumination zone 30 and the additional illumination zone 40 contact one another. In other words, the light cone 36 of the illumination zone 30 and the additional light cone 46 of the additional illumination zone 40 contact one another along a contact section of their respective outer areas. The light cone 36 and the additional light cone 46 do not intersect, however.
[0043] The additional lighting device 24 has a main beam axis 26. The main beam axis 26 designates that direction in which a plurality of the light beams generated by the additional lighting device 24 propagate. The additional lighting device 34 thus has the greatest illuminance along the main beam axis 26. In the embodiment of FIG. 1, the main beam axis 26 of the additional lighting device 24 is oriented substantially perpendicular to the direction of travel F of the two-wheeled vehicle 10 in the direction of the road surface 34. If a rider of the two-wheeled vehicle 10 inclines his head when riding the two-wheeled vehicle 10, he likewise looks on the road 34 substantially perpendicular to the direction of travel F of the two-wheeled vehicle 10. The direction of gaze of the rider on an inclination of his head and the main beam axis 26 of the additional lighting device 24 accordingly overlap. The main beam axis 26 in the embodiment of FIG. 1 is furthermore oriented substantially perpendicular to the contact surface 44 of the front wheel 12. The illuminance of the additional lighting device 24 is hereby the greatest in the region of the contact surface 44 of the front wheel 12. The additional illumination zone 40, in particular its arrangement, is spatially predefined with respect to the illumination zone 30 by the orientation of the main beam axis 26 perpendicular to the direction of travel F or perpendicular to the contact surface 44 of the front wheel 12 in the direction of the road 34.
[0044] FIG. 2 shows a two-wheeled vehicle in the form of a bicycle 10 in accordance with a further embodiment. The two-wheeled vehicle 10 shown in FIG. 2 likewise has a lighting device 22 and an additional lighting device 24. Analogously to the representation of FIG. 1, the lighting device 22 illuminates an illumination zone 30. The additional lighting device 24 illuminates an additional illumination zone 40. The illumination zone 30 is arranged in front of the additional illumination zone 40 in the direction of travel F of the two-wheeled vehicle 10.
[0045] In the embodiment of FIG. 2, the additional lighting device 24 is arranged at the frame component 16a of the frame 16 of the two-wheeled vehicle 10 such that the illumination zone 30 and the additional illumination zone 40 partially overlap in an overlap zone 42 of the road 34. The area of the overlap zone 42 here corresponds to a maximum of 33% of the area of the additional illumination zone 40. Due to the partial overlap of the illumination zone 30 and of the additional illumination zone 40 in the overlap zone 42, the overlap zone 42 is illuminated both by the lighting device 22 and by the additional lighting device 24 during the travel of the two-wheeled vehicle 10. The overlap zone 42 is accordingly doubly illuminated. A particularly relevant zone of the road 34, for example a zone directly in front of the front wheel 12 of the two-wheeled vehicle 10 can thus be illuminated with an increased illuminance due to the partial overlap of the illumination zone 30 and of the additional illumination zone 40.
[0046] In the embodiment of FIG. 2, the additional lighting device 24 is arranged at the frame component 16a of the frame 16 of the two-wheeled vehicle 10 such that the main beam axis 26 of the additional lighting device 24 is inclined by an angle 28 relative to the direction of travel F of the two-wheeled vehicle 10. Furthermore, the additional lighting device 24 is arranged at the frame component 16a of the frame 16 of the two-wheeled vehicle 10 such that the main beam axis 26 of the additional lighting device 24 is inclined by an angle 29 relative to the contact surface 44 of the front wheel 12 of the two-wheeled vehicle 10. Both the angle 28 and the angle 29 of the main beam axis 26 amount to a maximum of 30. The additional lighting device 24 arranged at the angles 28, 29 likewise enables the double illumination of a particularly relevant zone, for example a zone directly in front of the front wheel 12 of the two-wheeled vehicle 10.
[0047] FIGS. 3a to 3e each show a plan view of a two-wheeled vehicle in the form of a bicycle 10 having different spatial embodiments of additional illumination zones with respect to predefined illumination zones. The bicycle 10 has a front wheel 12, a rear wheel 14, a frame 16, and a steering device 18. Each of the bicycles 10 shown in FIGS. 3a to 3e furthermore has a lighting device 22 that is not shown for reasons of clarity. The lighting device 22 is configured to illuminate a respective illumination zone 30a, 30b, 30c, 30d, and 30e. Each of the bicycles 10 shown in FIGS. 3a to 3e furthermore has an additional lighting device 24 that is likewise not shown for reasons of clarity. The additional lighting device 24 is configured to illuminate a respective additional illumination zone 40a, 40b, 40c, 40d, and 40e.
[0048] The lighting device 22 is designed in FIG. 3a such that it illuminates an illumination zone 30a in the form of a half-ellipse, for example by means of a beam splitter or reflectors. The additional lighting device 24 is designed in a comparable manner such that it illuminates an additional illumination zone 40a in the form of a half-ellipse. The additional illumination zone 40a is thus spatially predefined with respect to the illumination zone 30a such that the lighting device 22 and the additional lighting device 34 together illuminate an ellipsoid total illumination zone.
[0049] The illumination zone 30b of the representation of FIG. 3b is illuminated in the form of an ellipse in which the front wheel 12 of the bicycle 10 is located. In this representation, the additional lighting device is designed such that it on the one hand illuminates a first partial illumination zone 40b1 in the form of a first ellipse tilted relative to a longitudinal axis of the bicycle 10, for example by means of a beam splitter or reflectors. The additional lighting device 24 is furthermore designed in the representation of FIG. 3b such that it illuminates a second partial illumination zone 40b2 in the form of a second ellipse tilted relative to the longitudinal axis of the bicycle 10 and relative to the first partial illumination zone 40b1. The additional illumination zone 40b is accordingly divided into two in the representation of FIG. 3b and comprises the partial illumination zones 40b1 and 40b2. The rear wheel 14 of the bicycle 10 is illuminated by both partial illumination zones 40b1 and 40b2 In the embodiment of FIG. 3b. The illumination zone 30b and the additional illumination zone 40b admittedly contact one another at the margins, but do not overlap in the representation of FIG. 3b.
[0050] In the embodiment of FIG. 3c, the illumination zone 30c is again illuminated in the form of an ellipse in which the front wheel 12 of the bicycle 10 is located. The additional illumination zone 40c is again divided into two in the representation of FIG. 3c, similar to the representation of FIG. 3b, and comprises the partial illumination zones 40c1 and 40c2. The partial illumination zones 40c1 and 40c2 are illuminated, comparably with the representation in FIG. 3b, in the form of ellipses that, unlike the embodiment of FIG. 3c, are not tilted, but whose longitudinal axes are rather oriented in parallel with the longitudinal axis of the bicycle 10. The illumination zone 30c and the additional illumination zone 40c, or its partial illumination zones 40c1 and 40c2, furthermore overlap in the representation of FIG. 3c.
[0051] Equivalently to the embodiments of FIGS. 3a to 3c, the illumination zone in the embodiment of FIG. 3d is likewise illuminated in the form of an ellipse oriented along the longitudinal axis of the bicycle 12. The additional lighting device 24 is, however, configured in this embodiment such that it illuminates an additional illumination zone 40d that includes the illumination zone 30d. The illumination zone 30d is accordingly doubly illuminated in the representation of FIG. 3d.
[0052] In the embodiment of FIG. 3e, the illumination zone 30e is illuminated in the form of a truncated cone. The additional lighting device 24 is here mounted on the bicycle 10 in a predefined location by means of the mounting means 20 such that it illuminates an additional illumination zone 40e that is arranged behind the illumination zone 30d in the direction of travel. The illumination zone 30e and the additional illumination zone 40e are furthermore formed spatially separate from one another. The outer contour of the additional illumination zone 40e here sectionally follows the outer contour of the illumination zone 30e. The outer contour of the additional illumination zone 40e is here spaced apart from the outer contour of the illumination zone 30e.
[0053] FIG. 4a shows a section of a steering device of a two-wheeled vehicle in the form of bicycle handlebars 18 in a view from below. The steering device 18 comprises a handlebar 181 and a handle piece 182 arranged at an end section of the handlebar 181. The handle piece 182 can be gripped in a known manner by a rider and can be used to steer the bicycle 10. The steering device 18 furthermore comprises a brake lever 183 that can be actuated in an known manner by the rider and that can be used to brake the bicycle 10. The brake lever 183 is held on the handlebar 181 by means of a mount 184.
[0054] An additional lighting device 124 in the form of a light emitting diode 124a is mounted on a lower side of the mount 184. For this purpose, the light emitting diode 124a comprises a mounting means that is configured in the form of an external thread 120 and that can cooperate with a mounting device configured in the form of an internal thread 121 to mount the light emitting diode 124a on the mount 184. As can be seen from FIG. 4a, the light emitting diode 124a is configured to illuminate an additional illumination zone 140a arranged below the light emitting diode 124a with respect to a direction of travel F of the two-wheeled vehicle.
[0055] FIG. 4b shows the bicycle handlebars 18 shown sectionally in FIG. 4a completely in a view from the front. In addition to the handle piece 182, the brake lever 183, and the mount 184, the steering device further comprises a further handle piece 182, a further brake lever 183, and a further mount 184 that are likewise arranged on the handlebar 181. The further handle piece 182, the further brake lever 183, and the further mount 184 are configured equivalently to the handle piece 182, the brake lever 183, and the mount 184.
[0056] A further light emitting diode 124b is mounted on a lower side of the further mount 184. For this purpose, the light emitting diode 124b comprises a mounting means that is configured in the form of an external thread 120 and that can cooperate with a mounting device configured in the form of an internal thread 121 to mount the light emitting diode 124b on the mount 184. As can be seen from FIG. 4b, the light emitting diode 124b is configured to illuminate an additional illumination zone 140a arranged below the light emitting diode 124b with respect to a direction of travel F of the two-wheeled vehicle. In the embodiment of FIG. 4b, the additional lighting device 134 is accordingly formed in two parts and comprises the light emitting diodes 124a, 124b. The two-part additional lighting device 124 is configured to illuminate the two-part additional illumination zone 140 that is formed by the partial illumination zones 140a and 140b.
[0057] FIG. 5a shows a section of a frame 16 of a two-wheeled vehicle. The frame 16 comprises a down tube 16a and a control tube 16b. The down tube 18a has a recess 161. The recess 161 is configured to releasably receive a two-wheeled vehicle component shown as a stop element 162. The stop element 162 is configured to bound an angle lock of handlebars of the two-wheeled vehicle received in the control tube 16b and not shown in FIG. 5a.
[0058] The stop element 162 has two oppositely disposed end sections 162a, 162b along a longitudinal direction. A mounting means is arranged at the end section 162a of the stop element 162 that is shaped as a holder 164a and by means of which a light emitting diode 224a can be mounted on the down tube 16a as a part of an additional lighting device 224. Furthermore, a mounting means is arranged at the end section 162b of the stop element 162 that is shaped as a holder 164b and by means of which a further light emitting diode 224b can be mounted on the down tube 16a as a further part of the additional lighting device 224. The additional lighting device 224 is again configured in two parts in the embodiment of FIG. 5a and comprises the light emitting diodes 224a and 224b. The light emitting diodes 224a, 224b are configured to respectively illuminate a partial zone 240a, 240b of an additional illumination zone 240 arranged below the light emitting diodes 224a, 224b on a road 34 of the two-wheeled vehicle in the direction of travel F of the two-wheeled vehicle.
[0059] FIG. 5b shows the stop element 162 shown in FIG. 5a having the light emitting diodes 224a, 224b received therein and forming the additional lighting device 240 in a representation separated from the down tube 16a.
[0060] The stop element 162 can be fastened to the down tube 16a by means of screws 170. In other words, the stop element 162 can be retrofitted to the down tube 16a. Since the light emitting diodes 224a, 224b forming the additional lighting device 240 are received in the stop element 162, they can also be retrofitted to the down tube 16a as a member of the stop element 162.
[0061] FIG. 6 shows a two-wheeled vehicle in the form of a bicycle 10 in accordance with an embodiment. The bicycle 10 comprises a lighting device 322 and an additional lighting device 324. The lighting device 322 is configured to illuminate an illumination zone 330 of the road 34. The additional lighting device 324 can be mounted on the bicycle 10 in a location predefined with respect to the lighting device 322 by means of a mounting means 320 and is configured to illuminate an additional illumination zone of the road 34 spatially predefined with respect to the illumination zone 330. In the representation of FIG. 6, the additional lighting device 324 is switched off, however.
[0062] The additional lighting device 324 is shown again in enlarged form in FIG. 6 and comprises an environmental light sensor 350 and a control device 360 that is in signal communication with the additional lighting device 324 and the environmental light sensor 350. The environmental light sensor 350 is here configured to detect an environmental brightness of the additional lighting device 324 and to transmit the detected environmental brightness to the control device 360. The control device 360 controls the additional lighting device 324 in dependence on the detected environmental brightness to illuminate the additional illumination zone. In the representation of FIG. 6, the additional lighting device 324 is switched off since the environmental brightness detected by the environmental light sensor 350 is sufficient to illuminate the road 34 with the aid of the lighting device 322.
[0063] FIG. 7 shows a two-wheeled vehicle in the form of a bicycle 10 in accordance with a further embodiment. The bicycle comprises a lighting device 422 and an additional lighting device 424. The lighting device 422 is configured to illuminate an illumination zone 430 of the road 34. The additional lighting device 424 can be mounted on the bicycle 10 in a location predefined with respect to the lighting device 422 by means of a mounting means 420 and is configured to illuminate an additional illumination zone of the road 34 spatially predefined with respect to the illumination zone 430. In the representation of FIG. 7, the additional lighting device 422 is switched off, however.
[0064] The additional lighting device 424 is shown again in enlarged form in the representation of FIG. 7 and comprises a motion sensor 450 and a control device 460 that is in signal communication with the additional lighting device 424 and the motion sensor 450. The motion sensor 450 is here configured to detect a movement in the environment of the additional lighting device 424 and to transmit the detected movement to the control device 460. A movement in the environment of the additional lighting device 424 is shown in FIG. 7 by a rider 11 approaching the two-wheeled vehicle 10. The control device 460 controls the additional lighting device 424 in dependence on the detected movement to illuminate an additional illumination zone 440.
[0065] In the representation of FIG. 7, the additional lighting device 424 is switched on since the motion sensor 450 has detected the approaching rider 11. The control device 460 therefore controls the additional lighting device 424 to illuminate the additional illumination zone 440. Mounting the two-wheeled vehicle 10 is thereby facilitated for the rider 11.
[0066] The lighting arrangement in accordance with the invention for a two-wheeled vehicle was presented in FIGS. 1 to 7 with reference to a bicycle as an example of a two-wheeled vehicle. However, this is not to be understood as restrictive. The lighting arrangement can also be used with other kinds of two-wheeled vehicles such as motorcycles or scooters.
REFERENCE NUMERALS
[0067] 10 two-wheeled vehicle; bicycle [0068] 11 rider [0069] 12 front wheel [0070] 14 rear wheel [0071] 16 frame [0072] 16a frame component; down tube [0073] 16b control tube [0074] 161 recess [0075] 162 two-wheeled vehicle component; stop element [0076] 162a, 162b end sections of the stop element [0077] 18 steering device [0078] 181 handlebar [0079] 182, 182 handle piece [0080] 183, 183 brake lever [0081] 184, 184 mount [0082] 20; 120, 120; 164a, 164b mounting means [0083] 121, 121 mounting device [0084] 22, 22; 322; 422 lighting device [0085] 24; 24; 124; 224; 324; 424 additional lighting device [0086] 124a, 124b; 224a, 224b light emitting diodes [0087] 26; 26 main beam axis [0088] 28,29 angle of the main beam axis [0089] 30; 30; 30a-30e; 330 illumination zone [0090] 32 surface section [0091] 34 road [0092] 30 light cone [0093] 38a, 38b bump, obstacle in the illumination zone [0094] 40; 40; 40a-40e; 140; 240; 440 additional illumination zone [0095] 40b1-40c2; 140a-240b partial illumination zones [0096] 42 surface section [0097] 42 overlap zone [0098] 44 contact surface of the front wheel [0099] 46 additional light cone [0100] 48a, 48b bump, obstacle in the additional illumination zone [0101] 350 environmental light sensor [0102] 450 motion sensor [0103] 360; 460 control device [0104] F direction of travel
