EP2366940B1 - Projektionsschweinwerfer für Motorräder - Google Patents

Projektionsschweinwerfer für Motorräder Download PDF

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Publication number
EP2366940B1
EP2366940B1 EP11001696.1A EP11001696A EP2366940B1 EP 2366940 B1 EP2366940 B1 EP 2366940B1 EP 11001696 A EP11001696 A EP 11001696A EP 2366940 B1 EP2366940 B1 EP 2366940B1
Authority
EP
European Patent Office
Prior art keywords
focus
reflector
lens
projector
optical axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11001696.1A
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English (en)
French (fr)
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EP2366940A3 (de
EP2366940A2 (de
Inventor
Takashi Akutagawa
Tooru Ehara
Tadashi Sakamoto
Tadanobu Abe
Junnichi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stanley Electric Co Ltd
Original Assignee
Stanley Electric Co Ltd
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Filing date
Publication date
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Publication of EP2366940A2 publication Critical patent/EP2366940A2/de
Publication of EP2366940A3 publication Critical patent/EP2366940A3/de
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Publication of EP2366940B1 publication Critical patent/EP2366940B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/338—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having surface portions added to its general concavity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/17—Arrangement or contour of the emitted light for regions other than high beam or low beam
    • F21W2102/18—Arrangement or contour of the emitted light for regions other than high beam or low beam for overhead signs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the presently disclosed subject matter relates to a motorcycle headlight of a projector type, and more particularly to a motorcycle projector headlight having a favorable light distribution pattern, which can form a right and left bank light distribution pattern for illuminating a right and left triangle dark zone between a horizontal line and a horizontal cut-off line for a low beam when a motorcycle banks, and which can form an overhead light distribution pattern for illuminating a traffic sign, etc.
  • a headlight of the motorcycle may form a light distribution pattern P1 for a low beam as shown FIG. 14a .
  • line H-H shows a horizontal line with respect to the road and line V-V shows a vertical line.
  • the light distribution pattern P1 may be located under the horizontal line H-H so as not to give a glaring type light to an oncoming car due to a low beam.
  • the light distribution pattern P1 may slant rightward as shown in FIG. 14b .
  • a triangle zone A between the horizontal line H-H and a right cut-off line of the light distribution pattern P1 becomes dark as compared with the light distribution pattern P1 shown in FIG. 14a , and therefore the motorcycle reduces visibility of the triangle dark zone.
  • FIG. 15 is a cross-section top view showing the conventional motorcycle projector headlight, which is disclosed in JP 2008-001306 A .
  • the conventional projector headlight 200 includes a projector headlight 210 for a low beam, a left cornering lamp 220L and a right cornering lamp 220R.
  • the projector headlight 210 includes: a light source 212; an ellipsoidal reflector 213 in which a first focus thereof is located near the light source 212; a projector lens 211 which has a focus thereof located near a second focus of the elliptical reflector 213; and a shade 214 located near the focus of the projector lens 211.
  • light emitted from the light source 212 is reflected on the elliptical reflector 213 and can be emitted in a forward direction of the projector headlight 210 via the projector lens 211.
  • the projector headlight 210 may form the light distribution pattern P1 for a low beam including a horizontal cut-off line as shown in FIGs. 14a and 14b in accordance with a top shape of the shade 214.
  • the left cornering lamp 220L is located in the projector headlight 200 to illuminate a leftward direction of the light distribution pattern P1 that is emitted from the projector headlight 210.
  • the right cornering lamp 220R is located in the projector headlight 200 to illuminate a rightward direction of the light distribution pattern P1 that is emitted from the projector headlight 210.
  • FIG. 16a is an explanatory diagrams depicting the light distribution patterns P1 for a low beam that is formed by the headlight 210 and an auxiliary light distribution pattern P2 that is formed by the left cornering lamp 220L when a motorcycle is perpendicular to a road.
  • a description of the right cornering lamp 220R is abbreviated to ease an understanding of the conventional projector headlight 200 of the FIG. 15 .
  • the auxiliary light distribution pattern P2 can change into another auxiliary light distribution pattern P3 by the left cornering lamp 220L. Consequently, the conventional projector headlight 200 may prevent from causing the triangle dark zone A.
  • FIG. 17a is a cross-section side view showing the left cornering lamp 220L and FIG. 17b is a perspective view showing a shade of the left cornering lamp 220L of FIG. 17a .
  • the left cornering lamp 220L includes: a light source 222; an ellipsoidal reflector 223 in which a first focus thereof is located near the light source 222; a projector lens 221 which has a focus thereof located near a second focus of the elliptical reflector 223; and a shade 224 including a fixing shade 224a and a movable shade 224b, and the shade 224 located near the focus of the projector lens 221.
  • the movable shade 224b is normally located near the focus of the projector lens 221 along with the fixing shade 224a as shown in FIG. 17b . Accordingly, the left cornering lamp 220L may form the auxiliary light distribution pattern P2 as shown in FIG. 16a because light emitted from the light source 222 is shielded by the movable shade 224b.
  • the movable shade 22b moves from the above-described normal position toward the ellipsoidal reflector 223 as shown in FIG. 17a .
  • the left cornering lamp 220L may form the other auxiliary light distribution pattern P3 as shown in FIG. 16b because the light emitted from the light source 222 is shielded by the fixing shade 224a, of which a top surface slants rightward.
  • a structure of the right cornering lamp 220R is basically the same as the left cornering lamp 220L except that the top surface of the fixing shade 224a slants leftward
  • the left cornering lamp 220L may prevent from causing the triangle dark zone between the horizontal line H-H and a left horizontal cut-off line of the light distribution pattern P1 when the motorcycle banks leftward.
  • the right cornering lamp 220R may also prevent from causing the right triangle dark zone between the horizontal line H-H and a right horizontal cut-off line of the light distribution pattern P1 when the motorcycle banks rightward.
  • the conventional projector headlight 200 may prevent from causing the right and left triangle dark zone, which results in a reduction of visibility.
  • EP 2 019 258 A1 discloses an optical module with a light source for an automobile light.
  • the module has a lamp transversally placed in a main reflector and emitting light rays.
  • a mirror has a reflecting surface turned towards the lamp for reflecting the light rays below the main reflector.
  • Another mirror has a reflecting surface oriented for receiving the light rays reflected by the mirror to reflect the light rays towards an output surface of a headlight.
  • US 2006/203503 A1 discloses a headlight for a motor vehicle designed to fulfil several functions, in particular a dual functions, one of the functions corresponding to a beam with cut-off, comprising: a light source, a main elliptical reflector having a scalloped part and an optical axis; a main lens disposed in front of the main elliptical reflector; a retractable shield able to occupy at least one active position for the cut-off beam and a retracted position for another type of beam; a secondary elliptical reflector coupled to the scalloped part of the main elliptical reflector and having a optical axis inclined with respect to that of the main reflector; and an additional lens disposed in front of the secondary elliptical reflector having an optical axis essentially parallel to that of the main lens.
  • EP 1 881 264 A1 discloses an optical module for headlights of an automobile.
  • the module has an additional module including a light source i.e. LED, and a lens placed in front of the LED for producing a complementary beam which provides a full beam when combined with a slanted cut off beam i.e. fog-light beam.
  • the module includes a hyperbolic light-recovery reflector rotated forwards and upwards. The LED is placed with respect to a focal point of the reflector, so that a part of light rays from the LED is reflected by the reflector along a rising direction for creating a floodlight in the full beam.
  • the conventional projector headlight 200 may illuminate the right and left triangle dark zone when a motorcycle banks, the cornering lamps 210L and 210R are required to illuminate the right and left triangle dark zone. Therefore, the projector headlight 200 includes problems in that a size thereof becomes large and a cost thereof also increases.
  • an additional lamp is required for the projector headlight 200. However, the additional lamp may cause problems such that the size becomes larger and also the cost further increases.
  • embodiments of the disclosed subject matter can include a motorcycle projector headlight for a low beam having a favorable light distribution pattern that can conform to a light distribution standard for headlights with respect to a bank light distribution pattern and an overhead light distribution pattern.
  • the embodiments of the disclosed subject matter can include a battery friendly motorcycle headlight using an LED light source as a light source with reference to a conventional vehicle headlight including the LED light source, which is disclosed in JP 2009-199938 A .
  • an aspect of the disclosed subject matter includes providing a motorcycle projector headlight for a low beam having a favorable light distribution pattern that can form a bank light distribution pattern and an overhead light distribution pattern while conforming to a light distribution standard for headlights.
  • Another aspect of the disclosed subject matter includes providing a motorcycle projector headlight using an LED light source, which can result in a battery friendly and small projector headlight having a favorable light distribution pattern so that it can be used for various types of motorcycles.
  • a motorcycle projector headlight is provided as set forth in claim 1.
  • the projector lens can form a light distribution pattern for a low beam below a horizontal line by using light reflected on the first reflector, and the optical lens can form an auxiliary light distribution pattern below an upward direction of 4 degrees with respect to the horizontal line by using light reflected on the second reflector.
  • a maximum lighting intensity of the auxiliary light distribution pattern between a rightward and leftward direction of 10 degrees with respect to a vertical line can be 1.08 luxes on a vertical screen that is vertically set at 25 meters away from the motorcycle projector headlight.
  • the projector lens can form the light distribution pattern for a low beam below a horizontal line via the first reflector, and the optical lens can form an auxiliary light distribution pattern via the second reflector.
  • the auxiliary light distribution pattern can include an overhead light distribution pattern for illuminating a traffic sign and the like and also can include a bank light distribution pattern for illuminating a right and left dark zone caused between the horizontal line and a horizontal cut-off line of the low beam when a motorcycle banks rightward and leftward.
  • the maximum light intensity of the auxiliary light distribution pattern can conform to ECE Regulation 113.
  • the motorcycle projector headlight can provide a favorable light distribution that includes the light distribution pattern for a low beam and the auxiliary light distribution pattern, which can conform to ECE Regulation 113.
  • the optical lens can be integrated as one body with the projector lens, and the incoming surface of the optical lens and an incoming surface of the projector lens can be formed as a co-planar surface.
  • the optical axis of the projector lens and the optical axis of the optical lens can be parallel with respect to each other, and the outgoing surface of the optical lens can include symmetric ellipsoidal surfaces on both sides of the outgoing surface in the horizontal cross-section surface.
  • the disclosed subject matter can provide the motorcycle projector headlight having a favorable light distribution pattern with a simple structure and a high accuracy.
  • a motorcycle projector headlight is provided as set forth in claim 2.
  • the motorcycle projector headlight using the LED light source can improve a light use efficiency.
  • the LED light source can be small in size and also can be a low power consumption semiconductor.
  • the disclosed subject matter can provide a small projector headlight that can perform a favorable light distribution pattern with a high efficiency and low power consumption.
  • FIG. 1 is a schematic perspective view showing a first exemplary structure of a motorcycle headlight of a projector type for a low beam made in accordance with principles of the disclosed subject matter.
  • FIG. 2 is a schematic side cross-section view showing the first structure for the motorcycle projector headlight of FIG. 1 .
  • the motorcycle projector headlight 100 can include a principal optical formation 10 for forming a fundamental light distribution pattern for a low beam and an auxiliary optical formation 20 for forming an auxiliary light distribution pattern.
  • the principal optical formation 10 can include: a light source 12; a first reflector 13 including a revolution-ellipsoidal surface in which a first focus thereof is located near (i.e., substantially at) the light source 12; a projector lens 11 which has a focus thereof located near (i.e., substantially at) a second focus of the first reflector 13; and a shade 14 in which a top edge thereof is located near (i.e., substantially at) the second focus of the first reflector 13.
  • the principal optical formation 10 In the principal optical formation 10, light emitted from the light source 12 can be reflected on the first reflector 13 and the reflected light Ray1 can be emitted in a forward direction of the principal optical formation 10 via the projector lens 11. In this case, a part of the light Ray1 that is reflected on the first reflector 13 can be shielded by the shade 14. Therefore, the principal optical formation 10 can form the fundamental light distribution pattern for a low beam including a horizontal cut-off line in accordance with the top edge of the shade 14 by using the light Ray1.
  • the auxiliary optical formation 20 can include a second reflector 21 that is located adjacent the first reflector 13, and the second reflector 21 can receive light other than the light Ray1 reflected on the first reflector 13 in the light emitted from the light source 12.
  • the auxiliary optical formation 20 can include an optical lens 22 that is located adjacent the projector lens 11 while facing the second reflector 21.
  • FIG. 3a and FIG. 3b are explanatory diagrams depicting the light distribution patterns P1 for a low beam formed by the light Ray1 and the auxiliary light distribution patterns P2 formed by the light Ray2, when a motorcycle is perpendicular to a road and when the motorcycle banks rightward with respect to the road, respectively.
  • the auxiliary light distribution pattern P2 can include an overhead light distribution pattern P2 OH for illuminating a traffic sign, etc. Additionally, the auxiliary light distribution pattern P2 can include a right and left bank light distribution pattern P2 B in order to illuminate a right and left triangle dark zone between a horizontal line H-H and a right and left horizontal cut-off line that is caused when the motorcycle banks with respect to a road.
  • FIG. 3b shows a case where the right bank light distribution pattern P2 B illuminates the right triangle dark zone A caused when the motor cycle banks rightward.
  • FIG. 4 is a diagram showing an exemplary auxiliary light distribution pattern formed by the motorcycle projector headlight 100 of FIG. 1 .
  • Each of the right and left bank light distribution pattern P2 B can be located between 10 degrees and 45 degrees in a rightward and leftward direction with respect to a vertical line V-V and between 1.0 degrees and 4.0 degrees in an upward direction with respect to the horizontal line H-H.
  • Each of light intensities of the right and left bank light distribution pattern P2 B can be approximately 2Lx on a vertical screen that is vertically set at 25 meters away from the projector headlight 100.
  • a region other than the bank light distribution pattern P2 B in the auxiliary light distribution pattern P2 can be used as the overhead light distribution pattern P2 OH along with the bank light distribution pattern P2 B for illuminating a traffic sign, etc.
  • a maximum light intensity of the overhead light distribution pattern P2 OH can be 1.08Lx on the vertical screen that is vertically set at 25 meters away from the projector headlight 100.
  • the auxiliary light distribution pattern P2 can conform to ECE Regulation 113 and can provide a favorable light distribution, which does not give a glaring type light to an oncoming car, etc.
  • the auxiliary light distribution pattern P2 including the overhead light distribution pattern P2 OH can illuminate various traffic signs such as a speed-limit sign and the like.
  • the right and left bank light distribution pattern P2 B can illuminate the right and left triangle dark zone caused between the horizontal line H-H and the right and left horizontal cut-off line. Therefore, the motorcycle projector headlight 100 of the disclosed subject matter can provide a high level of visibility with the light distribution pattern P1 for a low beam and the auxiliary light distribution pattern P2 as shown in FIGs. 3a and 3b .
  • FIG. 5 is a schematic top view showing the structure of the auxiliary optical formation 20 in the motorcycle projector headlight 100 of FIG. 1 .
  • FIG. 6 is a schematic side cross-section view showing the structure of the motor cycle projector headlight 100 including the auxiliary optical formation 20.
  • the second reflector 21 can be configured with an ellipsoidal surface C H having a first focus F1 and a second focus F2 in a horizontal cross-section shape, in which the focus F1 is located near (i.e., substantially at) the light source 12 and the focus F2 is located close to the outgoing surface 22b of the optical lens 22 or close to the incoming surface 22a.
  • the second reflector 21 can be configured with a parabolic surface C V having a focus F that is located near (i.e., substantially at) the light source 12 as shown in FIG. 6 .
  • an ellipsoidal surface C HA is located on a horizontal surface A-A that is located at the nearest position to the first reflector 13, and the ellipsoidal surface C HA can have a first focus F1 A and a second focus F2 A .
  • An ellipsoidal surface C HB is located on a horizontal surface B-B that is located at the farthest position to the first reflector 13, and the ellipsoidal surface C HB can have a first focus F1 B and a second focus F2 B .
  • Horizontal surfaces between the ellipsoidal surfaces C HA and C HB can be configured with a plurality of ellipsoidal surfaces having the first focus F1 and the second focus F2, and the horizontal surfaces can be connected by the parabolic surface Cv having the focus F in the vertical direction of the second reflector 21.
  • the light Ray 2 reflected on the second reflector 21 can move between the horizontal surfaces A-A and B-B in parallel with the horizontal surface A-A toward the optical lens 22, and can enter into the optical lens 22 from the incoming surface 22a so as to gather at the second focus F2 of the second reflector 21. Because the second focus F2 of the second reflector 21 is located close to the outgoing surface 22b, the light Ray 2 can enter into the optical lens 22 with confidence even when the optical lens 22 is downsized.
  • the optical lens 22 can be downsized, an incoming surface of the projector lens 11 can be enlarged in comparison with the incoming surface 22a of the optical lens 22. Therefore, the principal optical formation 10 can provide a favorable light distribution pattern for a low beam with a high brightness because the incoming surface of the projector lens 11 can be enlarged to form the light distribution pattern P1 with a high brightness.
  • FIGs. 7a, 7b and 7c are top, front and side views showing the projector lens 11 and the optical lens 22, respectively.
  • FIG. 8 is a perspective close-up view showing the optical lens 22.
  • the optical lens 22 can be integrated as one body with the projector lens 11 in a range of a width W and a height H.
  • the integration with projector lens 11 can result in preventing from a reduction of a fixing error in regard to the optical lens 22 and also can result in a reduction of a manufacturing process of the projector headlight 100.
  • the optical lens 22 can include: the incoming surface 22a receiving the light Ray 2 that is reflected on the second reflector 21; the outgoing surface 22b emitting the light Ray 2 as a diffusing light; a right and left joint portion 22b3 being provided between the optical lens 22 and the projector lens 11 to cast the optical lens 22 along with the projector lens 11; an optical axis AX; a central vertical line 22b CV intersecting with the optical axis AX at a right angle in a vertical direction of the optical axis AX; a central horizontal line 22b CH intersecting with the optical axis AX at a right angle in a horizontal direction of the optical axis AX; and a horizontal bottom surface 22C.
  • the height H of the optical lens 22 can be between 6 and 10 mil-meters in view of the auxiliary light distribution pattern P2 shown in FIG. 4 .
  • the incoming surface 22a can be formed on a vertical co-planar extension of the incoming surface of the projector lens 11 so that the light Ray2 reflected on the second reflector 21 can become approximately perpendicular to the incoming surface of the optical lens 22.
  • the incoming surface 22a can be formed in a shape other than the vertical planar such as a convex surface, etc.
  • FIG. 9 is an explanatory diagram including a top cross-section view taken along the central horizontal line 22b CH of the optical lens 22, which shows the auxiliary light distribution pattern P2 formed by diffusing the light Ray2 reflected on the second reflector 21 in a rightward and leftward direction by using the optical lens 22.
  • FIGs. 10a and 10b are explanatory side cross-section views taken along the central vertical line 22b CH , which shows diffusing states in an upward and downward direction of the light Ray2 reflected on second reflector 21 by the optical lenses 22 when each shape of outgoing surfaces 22b of the optical lenses 22 are circular and ellipsoidal in a vertical cross-section shape, respectively.
  • the outgoing surface 22b of the optical lens 22 can be bilaterally symmetric with respect to the central vertical line 22b CV in the horizontal cross-section shape.
  • the outgoing surface 22b can include a central portion 22b1 located near the central vertical line 22b CV and a right and left side portion 22b2 that is located from the central vertical line 22b CV toward the right and left joint portion 22b3 in the horizontal cross-section shape as shown in FIG. 9 .
  • the central portion 22b1 can be formed in a parabolic shape in the horizontal cross-section shape, and the right and left side portion 22b2 can be formed in an ellipsoidal shape in the horizontal cross-section shape. Accordingly, a part of the light Ray2 that passes through the central portion 22b1 can form the overhead light distribution pattern P2 OH formed between the right and left bank light distribution pattern P2 B . Another part of the light Ray that passes through the right and left side portion 22b2 can form the right and left bank light distribution pattern P2a of the auxiliary light distribution pattern P2 as shown in FIG. 9 .
  • a vertical cross-section shape of the outgoing surface 22b can be formed in a circular arc shape or in an ellipsoidal shape as shown in FIG. 10a and FIG. 10b .
  • the horizontal bottom surface 22C of the outgoing surface 22b of the optical lens 22 can intersect with a center C of the circle or the ellipsoidal in the vertical cross-section shape, and thereby can form a bottom horizontal line of the auxiliary light distribution pattern P2 with a simple structure.
  • the basic shape of the optical lens 22 is described above.
  • a more specific shape of the outgoing surface 22b of the optical lens 22 can be determined in accordance with a shape of the incoming surface 22a of the optical lens 22a, a shape of the second reflector 21, a positional relation between the projector lens 11 and the optical lens 22 and the like.
  • the positional relation between the projector lens 11 and the optical lens 22 will now be described with reference to FIGs. 7a-7c and FIG. 3a .
  • An optical axis PX of the projector lens 11 including the focus of projector lens 11 can be located on an imaginary line connecting the first focus and second focus of the first reflector 13.
  • the top edge of the shade 14 and the focus of the projector lens 11 can be located near (i.e., substantially at) the second focus of the first reflector 13 located on the imaginary line including the optical axis PX of the projector lens 11. Accordingly, the light distribution pattern P1 for a low beam can be formed bellow the horizontal line H-H as shown in FIG. 3a .
  • the optical axis PX of the projector lens 11 can be projected close to an intersection of the horizontal line H-H and the vertical line V-V.
  • the central vertical line 22b CV of the optical lens 22 including the optical axis AX of the optical lens 22 can be projected on the vertical line V-V in the auxiliary light distribution pattern P2 in FIG. 3a . Therefore, the optical axis AX of the optical lens 22 can be located a virtual vertical surface including the optical axis PX of the projector lens 11 as shown in FIG. 7a-7c . Thereby, the auxiliary light distribution pattern P2 emitted from the optical lens 22 can easily match the light distribution pattern P1 for a low beam emitted from the projector 11, especially in the horizontal direction.
  • the optical axis AX of the optical lens 22 can be located in parallel with the optical axis PX of the projector lens 11.
  • the auxiliary light distribution pattern P2 including the right and left bank light distribution pattern P2 B and the overhead light distribution pattern P2 OH can easily conform to a light distribution standard for headlights with a simple structure while matching the light distribution pattern P1 for a low beam emitted from the projector 11, especially in the vertical direction.
  • the motorcycle projector headlight 100 can form the fundamental light distribution pattern P1 for a low beam below the horizontal line and the auxiliary light distribution pattern P2 over the horizontal line.
  • the auxiliary light distribution pattern P2 can include the overhead light distribution pattern P2 OH for illuminating a traffic sign and the like and also can include the right and left bank light distribution pattern P2 B for illuminating the right and left triangle dark zone caused between the horizontal line and the horizontal cut-off line of the light distribution pattern P1 when a motorcycle banks rightward or leftward.
  • the motorcycle projector headlight 100 does not need the additional lamps like the conventional projector headlight to illuminate the auxiliary light distribution pattern P1. Furthermore, the maximum light intensity of the auxiliary light distribution pattern P2 can conform to ECE Regulation 113. Thus, the motorcycle projector headlight 100 can provide a favorable light distribution with a simple structure, which includes the fundamental light distribution pattern P1 for a low beam and the auxiliary light distribution pattern P2.
  • the above-described optical lens 22 is integrated as one body with the projector lens 11. However, the optical lens 22 can be separated from the projector lens 11 as shown in FIG. 11 . In the case, the optical axis AX of the optical lens 22 can be located on the virtual vertical surface including the optical axis PX of the projector lens 11 so that the auxiliary light distribution pattern P2 can easily match the light distribution pattern P1 for a low beam in the horizontal direction.
  • the optical lens 22 can be adjusted in the vertical direction so that the auxiliary light distribution pattern P2 can match the light distribution pattern P1 in the vertical direction. Therefore, the auxiliary light distribution pattern P2 can conform to a light distribution standard for headlights with confidence while preventing from giving a glaring type light to an oncoming car, etc.
  • FIG. 12 is a schematic side cross-section view showing an exemplary variation of the motorcycle projector headlight shown in FIG. 2 .
  • the second reflector 21 is located in the upward direction of the first reflector 13, and also the optical lens 22 is integrally located on a top surface of the projector lens 11.
  • the optical lens 22 cannot be limited to the above-described position.
  • the second reflector 21 can be located in a downward direction of the first reflector 13, and the optical lens 22 can also be located underneath a bottom surface of the projector lens 11 so as to face the second reflector 21.
  • an opening portion 14a can be located in the shade 14 so that the light Ray2 reflected on the second reflector 21 can easily enter into the optical lens 22.
  • the above-described position of the optical lens 22 can result in a shapely motorcycle projector headlight because the optical lens 22 can be located under the projector lens 11.
  • FIG. 13 is a schematic side cross-section view showing a second exemplary structure of the motorcycle project headlight for a low beam made in accordance with principles of the disclosed subject matter.
  • a difference between the second structure shown in FIG. 13 and the first structure shown in FIG. 1 relates to the light source 12.
  • a halogen bulb, an incandescent lamp, a high-intensity discharge lamp and the like can be used for the motorcycle projector headlight 100.
  • An LED light source 12a can be used as the light source 12 for the second structure of the motorcycle projector headlight 100.
  • the motorcycle projector headlight 100 can include: the shade 14 having a top edge; a circuit board 12b having a mounting surface and a virtual co-planar extension of the mounting surface intersecting with the top edge of the shade 14; the LED light source 12a mounted on the mounting surface of the circuit board 12b and having an optical axis OX extending substantially perpendicular to the mounting surface of the circuit board 12b; and the first reflector 13 configured with an ellipsoidal surface having a first focus and a second focus, the first focus located near (i.e., substantially as) the LED light source 12a so that the optical axis OX of the LED light source intersects with the first reflector, and the second focus located near (i.e., substantially at) the top edge of the shade 14.
  • the motorcycle projector headlight 100 can also the projector lens 11 configured as a convex lens having the optical axis PX and the focus located on the optical axis PX, the optical axis PX of the projector lens 11 intersecting with the second focus of the first reflector at the focus of the projector lens 11 and intersecting with the optical axis OX of the LED light source 12a and the virtual co-planar extension of the mounting surface of the circuit board 12b so that the circuit board 12b slants toward the first reflector 13 with respect to the optical axis PX of the projector lens 11.
  • the motorcycle projector headlight 100 can include the same second reflector 21 and the same optical lens 22 as these of the first structure shown in FIG. 1 .
  • the LED light source 12a can become small in size and also can reduce power consumption with compared to the light source 12 such as the high-intensity discharge lamp, etc. Furthermore, because light emitted from the LED light source 12a can be reflected as the lights Ray1 and Ray2 on the first and the second reflectors 13 and 21 without directly facing the shade 14, the motorcycle projector headlight 100 can improve the light use efficiency.
  • the second structure of the disclosed subject matter can provide a small projector headlight that can perform a favorable light distribution pattern with a high efficiency and low power consumption.
  • the above-described incoming surface 22a of the optical lens 22 may not be limited to the vertical flat shape. Instead, various shapes such as a slanted planar surface, an ellipsoidal surface, a parabolic surface and the like can be used as the incoming surface 22a of the optical lens 22.

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Claims (7)

  1. Projektionsscheinwerfer (100) für Motorräder, der Folgendes aufweist:
    eine Lichtquelle (12);
    einen ersten Reflektor (13), der mit einer elliptischen Oberfläche mit einem ersten Fokus bzw. Brennpunkt und einem zweiten Brennpunkt konfiguriert ist, und der erste Brennpunkt bei der Lichtquelle (12) gelegen ist;
    eine Projektorlinse (11), die als eine konvexe Linse mit einer optischen Achse (PX) und einem Brennpunkt, der auf der optischen Achse (PX) gelegen ist, konfiguriert ist, wobei die optische Achse auf einer imaginären Linie gelegen ist, die den ersten Brennpunkt und den zweiten Brennpunkt des ersten Reflektors (13) verbindet, und wobei der Brennpunkt der Projektorlinse (11) bei dem zweiten Brennpunkt des ersten Reflektors (13) gelegen ist;
    eine Blende (14) mit einer oberen Kante, die bei dem zweiten Brennpunkt des ersten Reflektors (13) gelegen ist;
    einen zweiten Reflektor (21), der benachbart zu dem ersten Reflektor (13) gelegen ist, um einen Teil des Lichts aufzunehmen, das von der Lichtquelle (12) emittiert wird, wobei der zweite Reflektor (21) mit einer elliptischen Oberfläche (CH) mit einem ersten Brennpunkt (F1) und einem zweiten Brennpunkt (F2) in einer horizontalen Querschnittsform konfiguriert ist, und mit einer parabolischen Oberfläche (CV) mit einem Brennpunkt (F) in einer vertikalen Querschnittsform konfiguriert ist, wobei der erste Brennpunkt (F1) der horizontalen, elliptischen Oberfläche (CH) des zweiten Reflektors (21) und der Brennpunkt (F) der vertikalen, parabolischen Oberfläche (CV) des zweiten Reflektors (21) bei der Lichtquelle (12) gelegen sind, und der erste Brennpunkt (F1) und der zweite Brennpunkt (F2) der horizontalen, elliptischen Oberfläche (CH) und der Brennpunkt (F) der vertikalen, parabolischen Oberfläche (CV) des zweiten Reflektors (21) auf einer virtuellen, vertikalen Oberfläche gelegen sind, die die optische Achse der Projektorlinse (11) aufweist; und
    eine optische Linse (22) mit einer Eingangsoberfläche (22a), einer Ausgangsoberfläche (22b) und einer optische Achse (AX), wobei die optische Linse (22) benachbart zu der Projektorlinse (11) gelegen ist, so dass die Eingangsoberfläche (22a) der optischen Linse (22) zu dem zweiten Reflektor (21) weist, wobei die optische Achse (AX) der optischen Linse (22) auf der virtuellen, vertikalen Oberfläche gelegen ist, die die optische Achse (PX) der Projektorlinse (11) aufweist, wobei die Ausgabeoberfläche (22b) der optischen Linse (21) bilateral symmetrisch in der horizontalen Querschnittsform in Bezug auf die virtuelle, vertikale Oberfläche ist, die die optische Achse (AX) der optischen Linse (22) aufweist, und in einer elliptischen Form oder einer kreisförmigen Bogenform in der vertikalen Querschnittsform geformt ist, wobei der zweite Brennpunkt (F2) der horizontalen, elliptischen Oberfläche (CH) des zweiten Reflektors (21) dicht bei der Ausgabeoberfläche (22b) der optischen Linse (22) oder der Eingangsoberfläche (22a) der optischen Linse (22) gelegen ist.
  2. Projektionsscheinwerfer (100) für Motorräder, der Folgendes aufweist:
    eine Blende (14) mit einer oberen Kante;
    eine Leiterplatte (12b) mit einer Anbringungsoberfläche und einer virtuellen, koplanaren Verlängerung der Anbringungsoberfläche, die sich mit der oberen Kante der Blende (14) schneidet;
    eine LED-Lichtquelle (12a), die auf der Anbringungsoberfläche der Leiterplatte (12b) angebracht ist und eine optische Achse (OX) aufweist, die sich senkrecht zu der Anbringungsoberfläche der Leiterplatte (12b) erstreckt;
    einen ersten Reflektor (13), der mit einer elliptischen Oberfläche mit einem ersten Brennpunkt und einem zweiten Brennpunkt konfiguriert ist, wobei der erste Brennpunkt bei der LED-Lichtquelle (12a) gelegen ist, so dass sich die optische Achse (OX) der LED-Lichtquelle (12a) mit dem ersten Reflektor (13) schneidet, und der zweite Brennpunkt bei der oberen Kante der Blende (14) gelegen ist;
    eine Projektorlinse (11), die als eine konvexe Linse konfiguriert ist, die eine optische Achse (PX) und einen Brennpunkt aufweist, der auf der optischen Achse (PX) gelegen ist, wobei sich die optische Achse (PX) der Projektorlinse (11) mit dem zweiten Brennpunkt des ersten Reflektors (13) bei dem Brennpunkt der Projektorlinse (11) schneidet und sich mit der optischen Achse (OX) der LED-Lichtquelle (12a) und der virtuellen, koplanaren Verlängerung der Anbringungsoberfläche der Leiterplatte (12b) schneidet, so dass sich die Leiterplatte (12b) zu dem ersten Reflektor (13) in Bezug auf die optische Achse (PX) der Projektorlinse (11) neigt;
    einen zweiten Reflektor (21), der benachbart zu dem ersten Reflektor (13) so angeordnet ist, dass er einen Teil des Lichts aufnimmt, das von der LED-Lichtquelle (12a) emittiert wird, wobei der zweite Reflektor (21) mit einer elliptischen Oberfläche (CH) konfiguriert ist, die einen ersten Brennpunkt (F1) und einen zweiten Brennpunkt (F2) in einer horizontalen Querschnittsform aufweist, und mit einer parabolischen Oberfläche (CV) mit einem Brennpunkt (F) in einer vertikalen Querschnittsform konfiguriert ist, wobei der erste Brennpunkt (F1) der horizontalen, elliptischen Oberfläche (CH) des zweiten Reflektors (21) und der Brennpunkt (F) der vertikalen parabolischen Oberfläche (CV) des zweiten Reflektors (21) bei der LED-Lichtquelle (12a) gelegen sind, und der erste Brennpunkt (F1) und der zweite Brennpunkt (F2) der horizontalen elliptischen Oberfläche (CH) des zweiten Reflektors (21) und der Brennpunkt (F) der vertikalen, parabolischen Oberfläche (CV) des zweiten Reflektors (21) auf einer virtuellen, vertikalen Oberfläche gelegen sind, die die optische Achse (PX) der Projektorlinse (11) aufweist; und
    eine optische Linse (22) mit einer Eingangsoberfläche (22a), einer Ausgangsoberfläche (22b) und einer optischen Achse (AX), wobei die optische Linse (22) benachbart zu der Projektorlinse (11) so gelegen ist, dass die Eingangsoberfläche (22a) der optischen Linse (22) zu dem zweiten Reflektor (21) weist, wobei die optische Achse (AX) der optischen Linse (22) auf der virtuellen, vertikalen Oberfläche gelegen ist, die die optische Achse (AX) der Projektorlinse (22) aufweist, wobei die Ausgangsoberfläche (22b) der optischen Linse (22) bilateral symmetrisch in der horizontalen Querschnittsform in Bezug auf die virtuelle, vertikale Oberfläche ist, die die optische Achse (AX) der optischen Linse (22) aufweist, und in einer elliptischen Form oder einer kreisförmigen Bogenform in der vertikalen Querschnittsform geformt ist, wobei der zweite Brennpunkt (F2) der horizontalen, elliptischen Oberfläche (CH) des zweiten Reflektors (21) dicht an der Ausgangsoberfläche (22b) der optischen Linse (22) oder der Eingangsoberfläche (22a) der optischen Linse (22) gelegen ist.
  3. Projektionsscheinwerfer (100) für Motorräder gemäß Anspruch 1 oder 2, wobei die Projektorlinse (11) ein Lichtverteilungsmuster (P1) für ein Abblendlicht unterhalb einer horizontalen Linie bildet, indem Licht verwendet wird, das auf der ersten Reflektor (13) reflektiert wird, und die optische Linse (22) ein Hilfslichtverteilungsmuster (P2) unterhalb einer Aufwärtsrichtung von 4 Grad in Bezug auf die horizontale Linie bildet, und zwar indem Licht verwendet wird, das auf dem zweiten Reflektor (21) reflektiert wird.
  4. Projektionsscheinwerfer (100) für Motorräder gemäß Anspruch 1 oder 2, wobei eine maximale Lichtintensität des Hilfslichtverteilungsmusters (P2) zwischen einer rechten und linken Richtung von 10 Grad in Bezug auf eine vertikale Linie 1,08 Lux auf einer vertikalen Projektionsfläche beträgt, die vertikal 25 Meter entfernt von dem Projektionsscheinwerfer (100) für Motorräder aufgestellt ist.
  5. Projektionsscheinwerfer (100) für Motorräder gemäß Anspruch 1 oder 2, wobei die optische Linse (22) als ein Körper mit der Projektorlinse (11) integriert ist, und die Eingangsoberfläche (22a) der optischen Linse (22) und eine Eingangsoberfläche der Projektorlinse (11) als eine koplanare Oberfläche gebildet sind.
  6. Projektionsscheinwerfer (100) für Motorräder gemäß Anspruch 1 oder 2, wobei die optische Achse (PX) der Projektorlinse (11) und die optische Achse (AX) der optischen Linse (22) parallel zueinander sind.
  7. Projektionsscheinwerfer (100) für Motorräder gemäß Anspruch 1 oder 2, wobei die Ausgangsoberfläche (22b) der optischen Linse (22) symmetrische, elliptische Oberflächen auf beiden Seiten der Ausgangsoberfläche (22b) in der horizontalen Querschnittsoberfläche aufweisen.
EP11001696.1A 2010-03-01 2011-03-01 Projektionsschweinwerfer für Motorräder Active EP2366940B1 (de)

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CN102192456B (zh) 2015-11-04
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EP2366940A3 (de) 2016-05-11
CN102192456A (zh) 2011-09-21
EP2366940A2 (de) 2011-09-21

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