EP2484960B1 - Fahrzeugscheinwerfer - Google Patents

Fahrzeugscheinwerfer Download PDF

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Publication number
EP2484960B1
EP2484960B1 EP12153195.8A EP12153195A EP2484960B1 EP 2484960 B1 EP2484960 B1 EP 2484960B1 EP 12153195 A EP12153195 A EP 12153195A EP 2484960 B1 EP2484960 B1 EP 2484960B1
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EP
European Patent Office
Prior art keywords
light emitting
emitting element
optical system
lamp
oblique cut
Prior art date
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Application number
EP12153195.8A
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English (en)
French (fr)
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EP2484960A2 (de
EP2484960A3 (de
Inventor
Akinori Matsumoto
Yuta Ugajin
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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Publication of EP2484960A2 publication Critical patent/EP2484960A2/de
Publication of EP2484960A3 publication Critical patent/EP2484960A3/de
Application granted granted Critical
Publication of EP2484960B1 publication Critical patent/EP2484960B1/de
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    • 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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • 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
    • F21S41/39—Attachment thereof

Definitions

  • the present invention relates to an optical unit and a vehicular lamp provided with the optical unit.
  • Patent Documents 1 and 2 describe vehicular lamps for forming a low beam distribution pattern including an oblique cut-off line. These vehicular lamps are so-called parabolic vehicular lamps that include light emitting elements and parabolic optical system reflectors that reflect lights from the light emitting elements to the front of the lamps. Moreover, US 2008 / 225539 A1 discloses a vehicular lamp according the preamble of claim 1.
  • a vehicular lamp used as a vehicular headlamp includes a left lamp arranged on the left side of a vehicle and a right lamp arranged on the right side of the vehicle.
  • the left lamp and the right lamp are normally designed such that the shapes of parabolic optical system reflectors thereof are symmetrical to each other, and the positions of light emitting elements thereof with respect to the parabolic optical system reflectors as well as the orientations of light emitting surfaces of the light emitting elements are also symmetrical to each other.
  • an overlap between the parabolic optical system reflector and an imaginary line, which passes through the light emitting surface of the light emitting element and extends at an angle corresponding to an inclination angle of an oblique cut-off line may be short when viewed from the front of the lamps. If the overlap is short, it is difficult to form a clear oblique cut-off line. Therefore, a lamp structure that makes it possible to ensure a length of the overlap is required.
  • the present invention was made in light of the above-described situations, and the object of the present invention is to provide art for forming a clear oblique cut-off line while reducing restrictions on the shape of a parabolic optical system reflector and preventing an increase in the size of the reflector.
  • an aspect of the present invention provides a vehicular lamp comprising a first lamp unit and a second lamp unit that are arranged to be respectively mounted on right and left sides of a vehicle in a vehicle width direction, the first lamp unit and the second lamp unit each including a light emitting element and a parabolic optical system reflector that reflects light from the light emitting element to a front of the lamp and which forms a light distribution pattern including an oblique cut-off line, and the parabolic optical system reflector has a generally rectangular shape when viewed from the front of the lamp; and the light emitting element (i) is arranged in a vicinity of a side of the generally rectangular shape, and arranged such that a normal to a light emitting surface of the light emitting element is inclined with respect to a horizontal line so that the oblique cut-off line is formed by light which is radiated from the light emitting surface in a direction of the normal to the light emitting surface and reflected by the parabolic optical system reflector, and (i)
  • the positions of the light emitting elements are symmetrical to each other and the orientations of the light emitting surfaces are also symmetrical to each other, it is possible to increase the length of an overlap between the parabolic optical system reflector and the normal to the light emitting surface when viewed from the front of the lamp, without increasing the size of the parabolic reflector, even if the parabolic optical system reflector has the generally rectangular shape when viewed from the front of the lamp. Therefore, it is possible to form a clear oblique cut-off line while reducing restrictions on the shape of the parabola optical reflector and preventing the increase in the size of the reflector.
  • the positions of the light emitting elements of the first and second lamp units with respect to the parabolic optical system reflectors in the vehicle width direction may be generally symmetrical to each other, and positions of the light emitting elements of the first and second lamp units with respect to the parabolic optical system reflectors in an up-down direction may be reversed. According to this aspect as well, it is possible to form a clear oblique cut-off line while reducing restrictions on the shape of the parabolic optical system reflector and preventing the increase in the size of the reflector.
  • a direction of light radiated from the light emitting element of the first lamp unit to the parabolic optical system reflector of the first lamp unit is a direction from one end side toward the other end side of the oblique cut-off line; and a direction of light radiated from the light emitting element of the second lamp unit toward the parabolic optical system reflector of the second lamp unit is a direction from the other end side toward the one end side of the oblique cut-off line.
  • an optical unit which includes a light emitting element mounting portion and a parabolic optical system reflector that reflects light from a light emitting element fixed on the light emitting element mounting portion to a front of the optical unit, and which is used in a vehicular lamp that forms a light distribution pattern including an oblique cut-off line, characterized in that: the parabolic optical system reflector has a generally rectangular shape when viewed from the front of the optical unit; and the light emitting element mounting portion (i) is arranged in a vicinity of a side of the generally rectangular shape, and arranged such that a normal to an element mounting surface is inclined with respect to a horizontal line so that the oblique cut-off line is formed by light which is radiated from a light emitting surface of the light emitting element fixed on the light emitting element mounting portion in a direction of a normal to the light emitting surface and reflected by the parabolic optical system reflector, and (ii) is positioned with respect to the parabolic optical system reflector
  • FIG. 1 is a front schematic view of a vehicular lamp according to a first embodiment.
  • a vehicular lamp 1 according to the embodiment is a vehicular headlamp apparatus that includes a pair of headlamp units 1L, 1R.
  • the headlamp units 1L, 1R are, respectively, arranged on the left and right sides in a vehicle width direction in the front of a vehicle.
  • the headlamp unit 1R is arranged on the right-hand portion of the vehicle front, and the headlamp unit 1L is arranged on the left-hand portion of the vehicle front.
  • each of the headlamp unit 1R and the headlamp unit 1L includes a lamp body 2 that has an opening portion on a vehicle front side and a translucent cover 4 that is attached so as to cover the opening portion of the lamp body 2.
  • the translucent cover 4 is made of translucent resin or glass.
  • a lamp chamber 3 is formed by the lamp body 2 and the translucent cover 4, and the lamp chamber 3 accommodates a low beam lamp unit 10 for forming a low beam distribution pattern.
  • the low beam lamp unit 10 includes a horizontal cut portion forming unit 12, an oblique cut portion forming unit 14, and a wide diffusion portion forming unit 16.
  • the lamp chamber 3 also accommodates lamp units 50, 52, 54 that form a high beam lamp unit, additional light distribution pattern forming units, turn signal lamp units, or the like.
  • FIG. 2 is a schematic view of a light distribution pattern formed by the vehicular lamp according to the first embodiment. It should be noted that FIG. 2 shows the light distribution pattern formed on a virtual vertical screen which is set at a predetermined position ahead of the lamp, for example, at a position 25 meters ahead of the lamp.
  • a low beam distribution pattern PL shown in FIG. 2 is formed by the low beam lamp unit 10 of the vehicular lamp 1 according to the first embodiment.
  • the horizontal cut portion forming unit 12 of the low beam lamp unit 10 forms a horizontal cut portion Lo1
  • the oblique cut portion forming unit 14 forms an oblique cut portion Lo2 (a light distribution pattern including an oblique cut-off line)
  • the wide diffusion portion forming unit 16 forms a wide diffusion portion Lo3.
  • the horizontal cut portion Lo1, the oblique cut portion Lo2, and the wide diffusion portion Lo3 are combined to form the low beam distribution pattern PL.
  • the low beam distribution pattern PL is a light distribution pattern designed so as not to give glare to other vehicles and pedestrians in an area ahead of the host vehicle when the host vehicle is traveling on the left side of a road.
  • the horizontal cut portion Lo1 is a generally oblong light distribution pattern that extends in a predetermined region in the vehicle width direction, which is below a horizontal line H and which includes a center portion in the vehicle width direction. A portion of an upper side of the horizontal cut portion Lo1 forms a horizontal cut-offline CL1.
  • the horizontal cut-offline CL1 extends in a horizontal direction, on the right side of a vertical line V.
  • the oblique cut portion Lo2 is a generally oblong light distribution pattern that has a major portion which is located on the left side of the vertical line V and which extends obliquely upward to the left from below the horizontal line H.
  • One side of the oblique cut portion Lo2 forms an oblique cut-off line CL2.
  • the oblique cut-off line CL2 extends at an inclination angle of 15 degrees obliquely upward to the left from the vicinity of an intersection between the horizontal cut-off line CL1 and the vertical line V.
  • the wide diffusion portion Lo3 is a generally oblong light distribution pattern that is located below the horizontal line H and diffuses more outward in the vehicle width direction than the horizontal cut portion Lo1 and the oblique cut portion Lo2.
  • FIG. 3 is a schematic front view of the oblique cut portion forming unit of the vehicular lamp according to the first embodiment.
  • FIG. 4 is a schematic front view of an oblique cut portion forming unit of a vehicular lamp according to a comparative example. It should be noted that light emitting element mounting portions are not shown in FIG. 4 .
  • the oblique cut portion forming unit 14 provided in the headlamp unit 1R is referred to as an oblique cut portion forming unit 14R (a first lamp unit), and the oblique cut portion forming unit 14 provided in the headlamp unit 1L is referred to as an oblique cut portion forming unit 14L (a second lamp unit), as appropriate.
  • the oblique cut portion forming unit 14R includes a so-called parabolic optical unit 20R and a light source module 26R.
  • the oblique cut portion forming unit 14L includes a so-called parabolic optical unit 20L and a light source module 26L.
  • the optical unit 20R includes a light emitting element mounting portion 22R and a parabolic optical system reflector 24R.
  • the light source module 26R is fixed on the light emitting element mounting portion 22R of the optical unit 20R.
  • the optical unit 20L includes a light emitting element mounting portion 22L and a parabolic optical system reflector 24L.
  • the light source module 26L is fixed on the light emitting element mounting portion 22L of the optical unit 20L.
  • the light emitting element mounting portions 22R, 22L are each connected to a heat sink (not shown) such that element mounting surfaces 22Ra, 22La thereof, on which the light source modules 26R, 26L are, respectively, fixed, face inward generally in the vehicle width direction.
  • the heat sink is fixed to the lamp body 2 via an aiming screw and a leveling shaft (both are not shown). It should be noted that a structure for attaching the oblique cut portion forming unit 14 to the lamp body 2 is well known and will be not be described in detail.
  • the light source modules 26R, 26L are, for example, light emitting diodes (LEDs), and include light emitting elements 26Ra, 26La and substrates 26Rb, 26Lb that support the light emitting element 26Ra, 26La, respectively.
  • the substrates 26Rb, 26Lb are thermal conductive insulating substrates made of ceramic or the like.
  • electrodes (not shown) that transfer the power to the light emitting elements 26Ra, 26La.
  • the light source modules 26R, 26L are fixed on the element mounting surfaces 22Ra, 22La of the light emitting element mounting portions 22R, 22L, and, in this state, light emitting surfaces of the light emitting elements 26Ra, 26La are parallel to the element mounting surfaces 22Ra, 22La, respectively. It should be noted that the light emitting surfaces of the light emitting elements 26Ra, 26La have generally rectangular shapes, and the light emitting elements 26Ra, 26La are arranged such that the longitudinal directions of the light emitting surfaces extend in the directions of the optical axes of the oblique cut portion forming units 14R, 14L.
  • the parabolic optical system reflectors 24R, 24L are reflective members for reflecting lights from the light emitting elements 26Ra, 26La to the front of the lamps.
  • the parabolic optical system reflectors 24R, 24L have reflective surfaces that use, as reference planes, portions of paraboloids of revolution whose focal points are in the vicinities of the light emitting elements 26Ra, 26La, respectively.
  • One ends of the parabolic optical system reflectors 24R, 24L are each fixed to the heat sink.
  • the parabolic optical system reflectors 24R, 24L have generally rectangular shapes when viewed from the front of the lamps.
  • the parabolic optical system reflectors 24R, 24L have generally parallelogram shapes that are long in the horizontal direction when viewed from the front of the lamps, and have sides 24Ra, 24La that are the outermost ends thereof in the vehicle width direction.
  • the sides 24Ra, 24La extend generally in the vertical direction and are inclined so as to extend outward in the vehicle width direction from the lower side to the upper side.
  • the shapes of the parabolic optical system reflector 24R and the parabolic optical system reflector 24L are generally symmetrical to each other.
  • Lights radiated from the light emitting elements 26Ra, 26La mounted on the light emitting element mounting portions 22R, 22L are reflected from the reflective surfaces of the parabolic optical system reflectors 24R, 24L to the front of the lamps, and the oblique cut portion Lo2 having the oblique cut-off line CL2 is formed by the lights reflected to the front of the lamps.
  • the light emitting element mounting portions 22R, 22L are arranged in the vicinities of the sides 24Ra, 24La of the generally rectangular shapes of the parabolic optical system reflectors 24R, 24L such that the element mounting surfaces 22Ra, 22La, respectively, face the reflective surface sides of the parabolic optical system reflectors 24R, 24L when viewed from the front of the lamps.
  • the light emitting element mounting portions 22R, 22L are arranged such that the element mounting surfaces 22Ra, 22La face the sides 24Ra, 24La, respectively.
  • Normals N to the element mounting surfaces 22Ra, 22La of the light emitting element mounting portions 22R, 22L are inclined with respect to horizontal lines H such that the oblique cut-off line CL2 is formed by the lights radiated from the light emitting surfaces of the light emitting elements 26Ra, 26La in directions of the normals to the light emitting surfaces and reflected by the parabolic optical system reflectors 24R, 24L.
  • the light emitting elements 26Ra, 26La fixed to the light emitting element mounting portion 22R are arranged in the vicinities of the sides 24Ra, 24La such that the light emitting surfaces of the light emitting elements 26Ra, 26La, respectively, face the reflective surface sides of the parabolic optical system reflectors 24R, 24L when viewed from the front of the lamps, and normals N to the light emitting surfaces are inclined with respect to the horizontal lines H such that the oblique cut-off line CL2 is formed by lights radiated in the directions of the normals to the light emitting surfaces and reflected by the parabolic optical system reflectors 24R, 24L.
  • the light emitting element 26Ra of the oblique cut portion forming unit 14R is arranged in the vicinity of the side 24Ra ,which is the outermost end in the vehicle width direction, such that the light emitting surface faces inward in the vehicle width direction.
  • the light emitting element 26Ra is inclined such that the light emitting surface faces obliquely upward, that is, such that a portion of the normal N, which extends from the light emitting surface to the light radiating direction side, is inclined upward with respect to the horizontal line H.
  • the light emitting element 26La of the oblique cut portion forming unit 14L is arranged in the vicinity of the side 24La ,which is the outermost end in the vehicle width direction, such that the light emitting surface faces inward in the vehicle width direction.
  • the light emitting element 26La is inclined such that the light emitting surface faces obliquely downward, that is, such that a portion of the normal N, which extends from the light emitting surface to the light radiating direction side, is inclined downward with respect to the horizontal line H.
  • the normals N to the element mounting surfaces 22Ra, 22La and the normals N to the light emitting surfaces of the light emitting elements 26Ra, 26La coincide with (are parallel to) imaginary lines P passing through the light emitting surfaces and extending parallel to the oblique cut-off line CL2. That is, the element mounting surfaces 22Ra, 22La and the light emitting elements 26Ra, 26La are inclined such that angles ⁇ R, ⁇ L, which are formed between the normals N and the horizontal lines H, are equal to 15 degrees that is the inclination angle of the oblique cut-off line CL2.
  • the angles ⁇ R, ⁇ L, which are formed between the normals N to the light emitting surfaces and the horizontal lines H are preferably set to be within a range from 7.5 to 22.5 degrees.
  • the light emitting element mounting portions 22R, 22L are positioned with respect to the parabolic optical system reflectors 24R, 24L so as to be offset from the centers 24Rac, 24Lac of the sides 24Ra, 24La in the directions opposite to the directions in which the portions of the normals N to the element mounting surfaces 22Ra, 22La, which extend from the element mounting surfaces 22Ra, 22La in the directions to the light radiating direction side of the light emitting elements 26Ra, 26La, are inclined with respect to the horizontal lines H.
  • the light emitting elements 26Ra, 26La are offset from the centers 24Rac, 24Lac of the sides 24Ra, 24La in the directions opposite to the directions in which rays X extending in the directions of the normals to the light emitting surfaces are inclined with respect to the horizontal lines H.
  • the ray X extending in the direction of the normal to the light emitting surface of the light emitting element 26Ra is inclined upward with respect to the horizontal line H, and therefore, the light emitting element 26Ra is offset along the side 24Ra downward from the center 24Rac of the side 24Ra.
  • the ray X extending in the direction of the normal to the light emitting surface of the light emitting element 26La is inclined downward with respect to the horizontal line H, and therefore, the light emitting element 26La is offset along the side 24La upward from the center 24Lac of the side 24La.
  • the position of the light emitting element 26Ra of the oblique cut portion forming unit 14R with respect to the parabolic optical system reflector 24R and the position of the light emitting element 26La of the oblique cut portion forming unit 14L with respect to the parabolic optical system reflector 24L in the vehicle width direction are generally symmetrical to each other, and the position of the light emitting element 26Ra with respect to the parabolic optical system reflector 24R and the position of the light emitting element 26La with respect to the parabolic optical system 24L in the up-down direction are reversed.
  • the light emitting element mounting portions 22R, 22L and the light emitting elements 26Ra, 26La are arranged such that at least the centers of the light emitting surfaces are offset from the centers 24Rac and 24Lac.
  • One of the light emitting surfaces of the light emitting element 26Ra and the light emitting element 26La is inclined with respect to a corresponding one of the side 24Ra and the side 24La, or both the light emitting surfaces of the light emitting element 26Ra and the light emitting element 26La are inclined with respect to the side 24Ra and the side 24La, respectively.
  • the light emitting surface of the light emitting element 26Ra is inclined so as to face obliquely upward as described above.
  • the side 24Ra of the parabolic optical system reflector 24R is inclined outward in the vehicle width direction from the lower side to the upper side.
  • An inclination angle of the side 24Ra with respect to the vertical line is substantially the same as the inclination angle ⁇ R of the normal N to the light emitting surface with respect to the horizontal line H. Therefore, the light emitting surface of the light emitting element 26Ra and the side 24Ra are generally parallel to each other.
  • the light emitting element 26La is inclined such that the light emitting surface thereof faces obliquely downward.
  • the shapes of the parabolic optical system reflector 24L and the parabolic optical system reflector 24R are symmetrical to each other, and the side 24La is inclined so as to extend outward in the vehicle width direction from the lower side to the upper side.
  • the light emitting surface of the light emitting element 26La is inclined with respect to the side 24La.
  • the light emitting surfaces of the light emitting element 26Ra and the light emitting element 26La are inclined with the respect to the sides 24Ra, 24La, respectively.
  • oblique cut portion forming units 114R, 114L of a vehicular lamp according to a comparative example respectively, include parabolic optical system reflectors 124R, 124L having the same shapes as the oblique cut portion forming units 14R, 14L according to the embodiment.
  • the positions of the light emitting element 126Ra, 126La in the vehicle width direction are symmetrical to each other, and the positions of the light emitting element 126Ra, 126La in the up-down direction are also symmetrical to each other.
  • the light emitting element 126Ra is provided at a center 124Rac of a side 124Ra, which is the outermost end of the parabolic optical system reflector 124R in the vehicle width direction, such that a light emitting surface of the light emitting element 126Ra faces obliquely upward.
  • the light emitting element 126La is provided at a center 124Lac of a side 124La, which is the outermost end of the parabolic optical system reflector 124L in the vehicle width direction, such that the light emitting surface of the light emitting element 126La faces obliquely upward.
  • the light emitting surface of the light emitting element 126Ra extends parallel to the side 124Ra
  • the light emitting surface of the light emitting element 126La extends parallel to the side 124La.
  • a normal N to the light emitting surface of the light emitting element 126Ra coincides with an imaginary line P which passes through the light emitting surface and extends parallel to the oblique cut-off line CL2.
  • a length Y of an overlap between the imaginary line P and the parabolic optical system reflector 124R when viewed from the front of the lamp is extremely shorter than that in the oblique cut portion forming unit 114L.
  • a length Y of an overlap between an imaginary line P and the parabolic optical system reflector 124L when viewed from the front of the lamp is longer than that in the oblique cut portion forming unit 114R.
  • a normal N to the light emitting surface of the light emitting element 126La does not coincide with the imaginary line P.
  • the light emitting element 126La of the oblique cut portion forming unit 114L is inclined but not in such a manner that the oblique cut-off line CL2 is formed by light which is radiated in the direction of the normal to the light emitting surface and reflected by the parabolic optical system reflector 124L.
  • the normals N to the light emitting surfaces of the light emitting elements 26Ra, 26La are inclined with respect to the horizontal lines H such that the oblique cut-off line CL2 is formed by the lights radiated in the directions of the normals to the light emitting surfaces. Therefore, both the oblique cut portion forming unit 14R and the oblique cut portion forming unit 14L can form the oblique cut-off line CL2 using the lights radiated in the directions of the normals to the light emitting surfaces.
  • a light emitting element has an orientation characteristic that the luminous intensity is normally highest in the direction of the normal to a light emitting surface thereof.
  • the oblique cut portion forming unit 14L according to the embodiment can form an oblique cut-offline CL2 that is clearer than that formed by the oblique cut portion forming unit 114L according to the comparative example.
  • the light emitting elements 26Ra, 26La are arranged so as to be offset from the centers 24Rac, 24Lac of the sides 24Ra, 24La in the directions opposite to the directions in which the rays X extending in the directions of the normals to the light emitting surfaces are inclined with respect to the horizontal lines H. That is, the light emitting elements 26Ra, 26La are offset from the centers 24Rac, 24Lac in such directions that the overlaps between the parabolic optical system reflectors 24R, 24L and the normals N to the light emitting surfaces when viewed from the front of the lamps increase.
  • the light emitting elements 26Ra, 26La are offset from the centers 24Rac, 24Lac such that the normals N to the light emitting surfaces approach diagonals of the generally rectangular shapes of the parabolic optical system reflectors 24R, 24L.
  • the length Y of the overlap in the oblique cut portion forming unit 14R according to the embodiment can be made longer than the length Y of the overlap in the oblique cut portion forming unit 114R according to the comparative example. Therefore, according to the embodiment, it is possible to form an oblique cut-off line CL2 that is clearer than that in the comparative example.
  • the light radiation direction of the oblique cut portion forming unit 14R from the light emitting element 26Ra to the parabolic optical system reflector 24R is a direction from one end side toward the other end side of the oblique cut-off line CL2.
  • the light radiation direction of the light emitting element 26Ra is a direction obliquely upward to the left from the vicinity of the intersection between the horizontal cut-off line CL1 and the vertical line V.
  • the light radiation direction of the oblique cut portion forming unit 14L from the light emitting element 26La to the parabolic optical system reflector 24L is a direction from the other end side toward the one end side of the oblique cut-off line CL2. Specifically, it is a direction from an obliquely upper left side to the vicinity of the intersection between the horizontal cut-offline CL1 and the vertical line V.
  • the luminous intensity of light radiated from a light emitting element normally decreases as the light advances from a light emitting surface thereof. Therefore, the one end side of the oblique cut-off line CL2 formed by the oblique cut portion forming unit 14R is clearer than the other end side thereof. In addition, the other end side of the oblique cut-off line CL2 formed by the oblique cut portion forming unit 14L is clearer than the one end side thereof.
  • the oblique cut-off line CL2 formed by the oblique cut portion forming unit 14R and the oblique cut-off line CL2 formed by the oblique cut portion forming unit 14L are combined to form the oblique cut-off line CL2 that is entirely clear from the one end side to the other end side thereof.
  • the parabolic optical system reflectors 24R, 24L have generally rectangular shapes when viewed from the front of the lamps.
  • the light emitting elements 26Ra, 26La (i) are arranged in the vicinities of the sides 24Ra, 24La of the generally rectangular shapes such that the normals N to the light emitting surfaces thereof are inclined with respect to the horizontal lines H so that the oblique cut-off line CL2 is formed by the lights radiated from the light emitting surfaces in direction of the normals to the light emitting surfaces and reflected by the parabolic optical system reflectors 24R, 24L, and (ii) are offset from the centers 24Rac and 24Lac of the sides 24Ra, 24La in the directions opposite to the directions in which the rays extending in the directions of the normals to the light emitting surfaces are inclined with respect to the horizontal lines H.
  • the parabolic optical system reflectors 24R, 24L have the generally rectangular shapes when viewed from the front of the units.
  • the light emitting element mounting portions 22R, 22L (i) are arranged in the vicinities of the sides 24Ra, 24La of the generally rectangular shapes such that the normals N to the element mounting surfaces 22Ra, 22La are inclined with the respect to the horizontal lines H so that the oblique cut-off line CL2 is formed by the lights radiated from the light emitting surfaces of the light emitting elements 26Ra, 26La in the directions of the normals to the light emitting surfaces of the light emitting elements 26Ra, 26La and reflected by the parabolic optical system reflectors 24R, 24L, and (ii) are offset from the centers 24Rac, 24Lac of the sides 24Ra, 24La in the directions opposite to the directions in which portions of the normals N to the element mounting surfaces 22Ra, 22La, which extend from the element mounting surfaces

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (5)

  1. Fahrzeugleuchte (1), die eine erste Leuchten-Einheit (1R) sowie eine zweite Leuchten-Einheit (1L) umfasst, die so eingerichtet sind, dass sie an einer rechten bzw. einer linken Seite eines Fahrzeugs in einer Fahrzeug-Breitenrichtung installiert sind, wobei die erste Leuchten-Einheit (1R) und die zweite Leuchten-Einheit (1L) jeweils ein lichtemittierendes Element (26Ra, 26La) sowie einen Parabol-Optiksystem-Reflektor (24R, 24L) enthalten, der Licht von dem lichtemittierenden Element (26Ra, 26La) zu einer Vorderseite der Leuchte (1) reflektiert und der ein Lichtverteilungsmuster (Lo2) erzeugt, das eine schräge Hell-Dunkel-Grenze (CL2) einschließt, und
    der Parabol-Optiksystem-Reflektor (24R, 24L), von der Vorderseite der Leuchte (1) aus gesehen, eine im Allgemeinen rechteckige Form hat; und
    das lichtemittierende Element (26Ra, 26La)
    a) in der Nähe einer Seite (24Ra, 24La) des Reflektors (24R, 24L) angeordnet ist, und so eingerichtet ist, dass eine Senkrechte (N) zu einer lichtemittierenden Fläche des lichtemittierenden Elementes (26Ra, 26La) in Bezug auf eine horizontale Linie (H) so geneigt ist, dass die schräge Hell-Dunkel-Grenze (CL2) durch Licht gebildet wird, das von der lichtemittierenden Fläche in einer Richtung der Senkrechten (N) zu der lichtemittierenden Fläche ausgestrahlt und durch den Parabol-Optiksystem-Reflektor (24R, 24L) reflektiert wird, und
    b) in Bezug auf den Parabol-Optiksystem-Reflektor (24R, 24L) so positioniert ist, dass es gegenüber einer Mitte (24Rac, 24Lac) der Seite (24Ra, 24La) in einer Richtung entgegengesetzt zu einer Richtung versetzt ist, in der ein Strahl (X), der sich in der Richtung der Senkrechten (N) zu der lichtemittierenden Fläche erstreckt, in Bezug auf die horizontale Linie (H) geneigt ist, dadurch gekennzeichnet, dass
    die Formen der Parabol-Optiksystem-Reflektoren (24R, 24L) der ersten und der zweiten Leuchten-Einheit (1R, 1L) Im Allgemeinen symmetrisch zueinander sind, wobei bei der ersten Leuchten-Einheit (1R) die lichtemittierende Fläche des lichtemittierenden Elementes (26Ra) und die entsprechende Seite (24Ra) parallel zueinander sind und bei der zweiten Leuchten-Einheit (1L) die lichtemittierende Fläche des lichtemittierenden Elementes (26La) in Bezug auf die entsprechende Seite (24La) geneigt ist.
  2. Fahrzeugleuchte (1) nach Anspruch 1, wobei:
    die Positionen der lichtemittierenden Elemente (26Ra, 26La) der ersten und der zweiten Leuchten-Einheit (1R, 1L) in Bezug auf die Parabol-Optiksystem-Reflektoren (24R, 24L) in einer vertikalen Richtung umgekehrt sind.
  3. Fahrzeugleuchte (1) nach einem der Ansprüche 1 bis 2, wobei:
    eine Richtung von Licht, das von dem lichtemittierenden Element (26Ra) der ersten Leuchten-Einheit (1R) zu dem Parabol-Optiksystem-Reflektor (24R) der ersten Leuchten-Einheit (1R) ausgestrahlt wird, eine Richtung von der Seite eines Endes zu der Seite des anderen Endes der schrägen Hell-Dunkel-Grenze (CL2) ist.
  4. Fahrzeugleuchte (1) nach einem der Ansprüche 1 bis 2, wobei:
    eine Richtung von Licht, das von dem lichtemittierenden Element (26La) der zweiten Leuchten-Einheit (1L) zu dem Parabol-Optiksystem-Reflektor (24L) der zweiten Leuchten-Einheit (1L) ausgestrahlt wird, eine Richtung von der Seite des anderen Endes zu der Seite des einen Endes der schrägen Hell-Dunkel-Grenze (CL2) ist.
  5. Fahrzeugleuchte (1) nach Anspruch 1, wobei jede Leuchten-Einheit (1R, 1L) eine Optik-Einheit (20R, 20L) enthält, die einen Abschnitt (22R, 22L) zum Anbringen eines lichtemittierenden Elementes sowie den Parabol-Optiksystem-Reflektor (24R, 24L) aufweist, der Licht von dem lichtemittierenden Element (26Ra, 26La), das an dem Abschnitt (22R, 22L) zum Anbringen eines lichtemittierenden Elementes befestigt ist, zu einer Vorderseite der Optik-Einheit (20R, 20L) reflektiert, und die Fahrzeugleuchte das Lichtverteilungsmuster (Lo2) erzeugt, das die schräge Hell-Dunkel-Grenze (CL2) einschließt, dadurch gekennzeichnet, dass:
    der Parabol-Optiksystem-Reflektor (24R, 24L), von der Vorderseite der Optik-Einheit aus gesehen, eine im Allgemeinen rechteckige Form hat; und
    der Abschnitt (22R, 22L) zum Anbringen eines lichtemittierenden Elementes
    a) in der Nähe einer Seite der Allgemeinen rechteckigen Form angeordnet ist, und so eingerichtet ist, dass die Senkrechte (N) zu einer Element-Anbringungsfläche (22Ra, 22La) in Bezug auf die horizontale Linie (H) so geneigt ist, dass die schräge Hell-Dunkel-Grenze (CL2) durch Licht gebildet wird, das von der lichtemittierenden Fläche des lichtemittierenden Elementes (26Ra, 26La), das an dem Abschnitt (22R, 22L) zum Anbringen eines lichtemittierenden Elementes befestigt ist, in der Richtung der Senkrechten (N) zu der lichtemittierenden Fläche ausgestrahlt und durch den Parabol-Optiksystem-Reflektor (24R, 24L) reflektiert wird, und
    b) in Bezug auf den Parabol-Optiksystem-Reflektor (24R, 24L) so positioniert ist, dass es gegenüber der Mitte (24Rac, 24Lac) der Seite in der Richtung entgegengesetzt zu einer Richtung versetzt ist, in der ein Abschnitt der Senkrechten (N) zu der Element-Anbringungsfläche (22Ra, 22La) in Bezug auf die horizontale Linie (H) geneigt ist, wobei sich der Abschnitt von der Element-Anbringungsfläche zu einer Seite der Lichtausstrahlungs-Richtung des lichtemittierenden Elementes (26Ra, 26La) erstreckt.
EP12153195.8A 2011-02-03 2012-01-31 Fahrzeugscheinwerfer Active EP2484960B1 (de)

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JP4094446B2 (ja) * 2003-02-03 2008-06-04 株式会社小糸製作所 車両用前照灯及び発光モジュール
JP4018016B2 (ja) * 2003-03-31 2007-12-05 株式会社小糸製作所 車両用前照灯
JP4061251B2 (ja) * 2003-08-05 2008-03-12 株式会社小糸製作所 車両用灯具
JP4926770B2 (ja) * 2007-03-15 2012-05-09 株式会社小糸製作所 車両用前照灯装置

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