JP2007080792A - Vehicle headlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle headlight in which a sure and clear cutoff line can be obtained, which used to be difficult to obtain in a conventional vehicle headlight due to a front-to-back dimension of a lighting tool becoming big. <P>SOLUTION: Light sources 2L, 2R are fixed on reflectors 3L, 3R in which a bulb axis Z1-Z1 is in an inclined condition against light axes ZL-ZL, ZR-ZR of reflecting faces and moreover in a rotating condition around the bulb axis Z1-Z1. As a result, a front-to-back dimension of the lighting tool can be made short and compact. The light sources 2L, 2R are provided with light shielding stripes 21, 22 which form first cutoff lines C1, C1L, C1R and second cutoff lines C2, C2L, C2R. Thus, sure and clear cutoff lines C1, C1L, C1R, C2, C2L, C2R are obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle headlamp that irradiates a predetermined light distribution pattern having a cut-off line, for example, a light distribution pattern for passing or a light distribution pattern for an expressway in front of the vehicle.

  This type of vehicle headlamp has been conventionally used (for example, Patent Document 1). Hereinafter, a conventional vehicle headlamp will be described. A conventional vehicle headlamp includes a light source, a light-shielding film provided on the light source, and a reflecting surface that reflects light from the light source body and irradiates a passing light distribution in front of the vehicle. It is. A conventional vehicular headlamp forms a cut-off line for passing light distribution by a light shielding film.

  However, in the conventional vehicle headlamp, when the light source is arranged so that the axis of the light source coincides with the optical axis of the reflecting surface, the dimension of the lamp in the front-rear direction (depth dimension of the lamp) increases. Further, in the conventional vehicle headlamp, when the light source is arranged so that the axis of the light source intersects with the optical axis of the reflecting surface, the position of the light shielding film of the light source is determined by the light source axis and the optical axis of the reflecting surface. Are shifted from the position of the light shielding film when they are arranged so as to coincide with each other, and it becomes difficult to obtain an accurate and clear cut-off line.

Japanese Patent Laid-Open No. 11-232903

  The problem to be solved by the present invention is that, in a conventional vehicle headlamp, when the light source is arranged so that the axis of the light source coincides with the optical axis of the reflecting surface, the dimension of the lamp in the front-rear direction increases. If the light source is arranged so that the axis of the light source and the optical axis of the reflection surface intersect, it is difficult to obtain an accurate and clear cut-off line.

  The present invention (the invention according to claim 1) has a first cut-off line whose light distribution pattern is located on the traveling lane side and a second cut-off line located on the opposite lane side. A light-shielding stripe forming the second cut-off line is provided in the direction of the light source axis, and the light source is attached to the reflector in a state where the light source axis is inclined with respect to the optical axis of the reflecting surface and rotated around the light source axis. A first reflecting surface portion forming a first light distribution pattern portion including a first cutoff line, a second reflecting surface portion forming a second light distribution pattern portion including a second cutoff line, and And a third reflecting surface portion that forms a third light distribution pattern portion located between the first light distribution pattern portion and the second light distribution pattern portion.

  In the present invention (the invention according to claim 2), the light source is attached to the reflector in a state where the light source is inserted in the direction of the light source axis from the rear side of the vehicle toward the front side and toward the outer side of the vehicle. It is located inside the vehicle, the second reflecting surface portion is located outside the vehicle, and the range of the first reflecting surface portion is wider than the range of the second reflecting surface portion.

  In this invention (the invention according to claim 3), the light source is attached to the reflector in a state where the light source is inserted in the direction of the light source axis from the rear side of the vehicle toward the front side and toward the outside of the vehicle. Located on the inner side of the vehicle, the second reflecting surface portion is located on the outer side of the vehicle, and the distance from the optical axis of the first reflecting surface portion to the inner end portion of the vehicle is the outer end of the vehicle from the optical axis of the second reflecting surface portion. It is longer than the distance to the part.

  In the vehicle headlamp according to this invention (the invention according to claim 1), the light source is attached to the reflector in a state where the light source axis is inclined with respect to the optical axis of the reflecting surface. Small and compact. In the vehicle headlamp of the present invention (the invention according to claim 1), the light source has a light shielding stripe on the first reflecting surface portion and the second reflecting surface portion of the reflecting surface by rotating the light source around the light source axis. Since it is projected, the first cut-off line and the second cut-off line of a predetermined light distribution pattern can be accurately and clearly formed by the light shielding stripe.

  In the vehicle headlamp of the present invention (the invention according to claim 2), the range of the first reflection surface portion located inside the vehicle is wider than the range of the second reflection surface portion located outside the vehicle. The light intensity (illuminance, light amount) of the first light distribution pattern portion including the first cutoff line located on the traveling lane side can be increased. As a result, the vehicular headlamp according to the present invention (the invention according to claim 2) has improved visibility in the distance on the traveling lane side, and can contribute to traffic safety.

  Furthermore, in the vehicle headlamp according to the present invention (the invention according to claim 3), the distance from the optical axis of the first reflecting surface portion located inside the vehicle to the end portion inside the vehicle is located outside the vehicle. Since it is longer than the distance from the optical axis of the second reflecting surface part to the outer edge of the vehicle, it applies to vehicle designs where the wraparounds on both the left and right sides of the front part of the vehicle slant (curve and tilt) from the inside to the outside of the vehicle can do. In other words, it can be used for designs with large lateral slants.

  Embodiments of a vehicle headlamp according to the present invention will be described below in detail with reference to the drawings. In the drawing, the symbol “F” indicates the forward direction of the automobile (vehicle) C (the forward direction of the automobile C). The symbol “B” indicates the backward direction of the automobile C. Reference sign “U” indicates an upward direction as viewed from the driver side. Reference sign “D” indicates a downward direction as viewed from the driver side. The symbol “L” indicates the left direction when the front direction is viewed from the driver side. The symbol “R” indicates the right direction when the front direction is viewed from the driver side. Reference sign “VU-VD” indicates vertical lines on the upper and lower sides of the screen S. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen S. Reference numerals “ZL-ZL” and “ZR-ZR” denote optical axes. Reference sign “ZC-ZC” indicates a vehicle axis. The symbols “X”, “Y”, and “Z” are the X axis of the three-dimensional orthogonal coordinates (the right direction R of the automobile C is the positive direction), the Y axis (the upward direction U of the automobile C is the positive direction). , Z axis (the forward direction F of the automobile C is the positive direction).

  In this example, the vehicle headlamp in this embodiment is a headlamp of an automobile, for example, and a headlamp from which a light distribution pattern for passing is obtained will be described. Note that the present invention is not limited to the embodiments. In this specification and the drawings, the case where the automobile C is left-hand traffic will be described. When the car C is on the right-hand traffic, the left-hand traffic is reversed.

  Hereinafter, the configuration of the vehicle headlamp in this embodiment will be described. As shown in FIG. 1, the vehicle headlamp in this embodiment includes a left vehicle headlamp (hereinafter referred to as a “left headlamp”) 1L provided on the left side of the front portion of the automobile C, It is composed of a right vehicle headlamp (hereinafter referred to as a “right headlamp”) 1R equipped on the right side of the front portion of the automobile C.

  The left head lamp 1L and the right head lamp 1R are configured to be substantially bilaterally symmetric (reverse left and right). That is, as shown in FIG. 1, the left headlamp 1L and the right headlamp 1R include light sources 2L and 2R and reflectors 3L and 3R. The light sources 2L and 2R and the reflectors 3L and 3R are respectively disposed in a lamp chamber (not shown) defined by a lamp housing (not shown) and a lamp lens (not shown).

  As shown in FIG. 15, the left headlamp 1L and the right headlamp 1R irradiate a predetermined light distribution pattern having a cut-off line, that is, a light distribution pattern P for passing in this example, in front of the automobile. Is. The light distribution pattern P for passing, as shown in FIG. 15, is a first cut-off line C1 of an oblique cut-off line (for example, an inclination of about 15 °) located on the traveling lane side (left-hand side from left-hand traffic), And a second cutoff line C2 that is a horizontal cutoff line located on the opposite lane side (right side because it is left-hand traffic). Further, as shown in FIG. 15, the passing light distribution pattern P includes a first light distribution pattern portion P1 including the first cutoff line C1 and a second light distribution pattern portion including the second cutoff line C2. P2 and a third light distribution pattern portion P3 located between the first light distribution pattern portion P1 and the second light distribution pattern portion P2.

  The light sources 2L and 2R are, for example, gas discharge light sources, and use high-pressure metal vapor discharge lamps such as metal halide lamps and discharge lamps such as high-intensity discharge lamps (HID bulbs). In this example, the light sources 2L and 2R use a D2R bulb or a D4R bulb provided with two light shielding stripes 21 and 22 as a light shielding coating.

  2 and 3, the light sources 2L and 2R are, as shown in FIG. 2 and FIG. 3, an arc tube 20, an outer tube (outer bulb) 23 covering the outside of the arc tube 20, and a light source axis (reference axis) on the outer tube 23. The two light-shielding stripes 21 and 22 provided in the direction of the bulb axis Z1-Z1 and a base 24 for holding the base ends of the arc tube 20 and the outer tube 23 are provided. In FIG. 3, reference numeral 25 denotes a shade. The shade 25 covers the lower part and the front part of the light sources 2L and 2R, the light emitted from the lower part between the two light shielding stripes 21 and 22 of the light sources 2L and 2R, and the light sources 2L and 2R. It shields direct light from the front.

  The arc tube 20 is filled with rare gas (xenon gas), mercury, metal iodide (sodium, scandium) and the like. The electrode on the base 24 side and the electrode on the lead wire side provided at the tip of the outer tube 23 via a ceramic pipe face each other with a slight gap therebetween. When a voltage is applied to the electrode, arc discharge occurs in the arc tube 20 and the arc tube 20 emits light.

  The light sources 2L and 2R are provided with a first cut-off line C1 and a second cut-off line of the light distribution pattern P for passing shown in FIG. 15 by the two light shielding stripes 21 and 22 provided on the outer tube 23. And C2. As shown in the front view of FIG. 3, the two light shielding stripes 21 and 22 are provided in the outer tube 23 with a predetermined width (center angle). Between the upper edge of the first light shielding stripe 21 (boundary line on the clockwise direction) and the upper edge of the second light shielding stripe 22 (boundary line on the counterclockwise direction), θ is 180 ° (in this example, It is in the range of the angle of the central angle plus about 15 °).

  The light sources 2L and 2R are connected to the reflectors 3L and 3R, and the bulb axis Z1-Z1 is relative to the optical axes ZL-ZL and ZR-ZR (Z-axis of three-dimensional orthogonal coordinates) of the reflecting surfaces of the reflectors 3L and 3R. In a tilted state and rotated around the valve shaft Z1-Z1.

  That is, in the right headlamp 1R, when the origin of the three-dimensional orthogonal coordinates is made to coincide with the center (arc center) of the arc tube 20 of the light source 2R, the bulb axis Z1-Z1 of the light source 2R is shown in FIG. Thus, θR (about 35 ° to about 55 ° in this example) clockwise about the Y axis with respect to the optical axis ZR-ZR (Z axis of three-dimensional orthogonal coordinates) of the reflecting surface of the reflector 3R It is in an inclined state rotated by a minute. The θR is an angle at which the light source 2R is inserted into the reflector 3R. As shown in FIGS. 3 and 5, the light source 2R is φR (in this example, about 3 ° to about 7 in the clockwise direction with the valve shaft Z1-Z1 as the center, based on the state shown in FIG. °) Rotated for minutes. Further, a light source insertion hole (bulb hole) 4R is provided at a location corresponding to the bulb axis Z1-Z1 in the reflector 3R.

  The light source 2R is attached to and detached from the reflector 3R while being inserted in the direction of the bulb axis Z1-Z1 from the rear side to the front side of the vehicle and toward the outside of the vehicle (right side in the case of the right headlamp 1R). It is attached as possible. At this time, as shown in FIG. 6, the upper edge of the second light-shielding stripe 22 of the light source 2R is projected onto the reflecting surface of the reflector 3R to form a first cut-off line C1R, and the light source 2R The upper edge of the first light shielding stripe 21 is projected to form a second cutoff line C2R. As a result, by the light source 2R and the reflector 3R, as shown in FIG. 7, the basic light distribution pattern PR having the first cut-off line C1R and the second cut-off line C2R (screen 10 m away from the right headlamp 1R). (Light distribution pattern projected on S).

  On the other hand, in the left headlamp 1L, when the origin of the three-dimensional orthogonal coordinates is made to coincide with the center (arc center) of the arc tube 20 of the light source 2L, the bulb axis Z1-Z1 of the light source 2L is shown in FIG. Thus, θL (in this example, about 35 ° to about 55 °) counterclockwise with respect to the optical axis ZL-ZL (the Z axis of the three-dimensional orthogonal coordinates) of the reflecting surface of the reflector 3L. ) It is in a tilted state rotated by minutes. The angle θL is an angle at which the light source 2L is inserted into the reflector 3L. 3 and 10, the light source 2L is φL (in this example, about 4 ° to about 4 ° counterclockwise around the valve shaft Z1-Z1 with the state shown in FIG. 3 as a reference). 7 degrees). Further, a light source insertion hole (bulb hole) 4L is provided at a location corresponding to the bulb axis Z1-Z1 in the reflector 3L.

  The light source 2L is attached to and detached from the reflector 3L while being inserted in the direction of the bulb axis Z1-Z1 from the rear side to the front side of the vehicle and toward the outside of the vehicle (left side in the case of the left headlamp 1L). It is attached as possible. At this time, as shown in FIG. 11, the upper edge of the first light-shielding stripe 21 of the light source 2L is projected onto the reflecting surface of the reflector 3L to form the first cut-off line C1L, and the light source 2R The upper edge of the second light shielding stripe 22 is projected to form a second cutoff line C2L. As a result, by the light source 2L and the reflector 3L, as shown in FIG. 12, a basic light distribution pattern PL having a first cut-off line C1L and a second cut-off line C2L (screen 10 m away from the left headlamp 1L). (Light distribution pattern projected on S).

  The reflecting surfaces of the reflectors 3L and 3R are reflecting surfaces based on a parabolic surface (basic), and the light from the light sources 2L and 2R is moved to the left and right with respect to the optical axes ZL-ZL and ZR-ZR. It is crossed and reflected. Therefore, as described above, the first cut-off lines C1L and C1R and the second cut-off lines C2L and C2R (see FIGS. 6 and 11) projected onto the reflecting surfaces of the reflectors 3L and 3R are as shown in FIG. 7. As shown in FIG.

  The reflective surfaces of the reflectors 3L and 3R are, as shown in FIGS. 8 and 13, first reflective surface portions 3L1 and 3R1 that form the first light distribution pattern portion P1 including the first cutoff lines C1, C1L, and C1R. And second reflective surface portions 3L2, 3R2 forming the second light distribution pattern portion P2 including the second cutoff lines C2, C2L, C2R, the first light distribution pattern portion P1, and the second light distribution pattern portion. And third reflective surface portions 3L3 and 3R3 forming the third light distribution pattern portion P3 located between the second light distribution pattern portion P3 and the second light distribution pattern portion P3.

  The first reflecting surface portions 3L1, 3R1 are located inside the vehicle C, on the right side in the case of the left headlamp 1L, and on the left side in the case of the right headlamp 1R. The second reflecting surface portions 3L2, 3R2 are located outside the vehicle C, on the left side in the case of the left headlamp 1L, and on the right side in the case of the right headlamp 1R.

  The range of the first reflective surface portions 3L1, 3R1 is wider than the range of the second reflective surface portions 3L2, 3R2. That is, in the right headlamp 1R, as shown in FIG. 8, the range of the first reflecting surface portion 3R1 is θR1 (in this example, about 25 in the counterclockwise direction from the X axis centering on the Z axis and the Z axis). °) The range surrounded by the line rotated by minutes. Further, the range of the second reflecting surface portion 3R2 includes a line rotated clockwise from the X axis by θR2 (about 10 ° in this example) around the Z axis, and is also opposite from the X axis around the Z axis. A range surrounded by a line rotated clockwise by θR3 (about 25 ° in this example). On the other hand, in the left headlamp 1L, as shown in FIG. 13, the range of the first reflecting surface portion 3L1 is θL1 (in this example, about 25 in the counterclockwise direction from the X axis with the Z axis as the center). °) The range surrounded by the line rotated by minutes. Further, the range of the second reflecting surface portion 3L2 includes a line rotated counterclockwise from the X axis by θL2 (about 20 ° in this example) around the Z axis, and from the X axis around the Z axis. A range surrounded by a line rotated by θL3 (about 15 ° in this example) in the clockwise direction.

  The first reflecting surface portions 3L1, 3R1 have a standing wall shape, and the distance from the optical axis ZL-ZL, ZR-ZR of the first reflecting surface portions 3L1, 3R1 to the inner end portion of the automobile C is It is longer than the distance from the optical axes ZL-ZL, ZR-ZR of the second reflecting surface portions 3L2, 3R2 to the outer end of the automobile C.

  The first cutoff line C1R and the first cutoff line C1R shown in FIG. 7 and the first reflection line 3L1, 3R1 and the second reflection surface parts 3L2, 3R2 and the third reflection surface parts 3L3, 3R3 of the reflectors 3L, 3R are formed. FIG. 15 shows the basic light distribution pattern PR having two cut-off lines C2R and the basic light distribution pattern PL having the first cut-off line C1L and the second cut-off line C2L shown in FIG. The passing light distribution pattern P having the first cutoff line C1 and the second cutoff line C2 is formed.

  That is, as shown in FIG. 8, a segment (block) in which the first reflecting surface portion 3R1 of the reflector 3R is inclined by θR4 (about 15 ° in this example) with respect to the Y axis (vertical axis, vertical axis). Into 6 parts (3R11, 3R12, 3R13, 3R14, 3R15, 3R16). Further, the second reflecting surface portion 3R2 of the reflector 3R is divided into six segments (blocks) substantially parallel to the Y axis (3R21, 3R22, 3R23, 3R24, 3R25, 3R26). As a result, as shown in FIG. 14, the first reflecting surface 3R1 (3R11, 3R12, 3R13, 3R14, 3R15, 3R16) of the reflector 3R divided into six parts has the first cut-off lines C1, C1R. A light distribution pattern portion P1 (P11, P12, P13, P14, P15, P16) is formed. Further, the second light distribution pattern portion P2 (P21, P2) having the second cut-off lines C2, C2R by the second reflecting surface portion 3R2 (3R21, 3R22, 3R23, 3R24, 3R25, 3R26) of the reflector 3R divided into six. P22, P23, P24, P25, P26) are formed.

  On the other hand, as shown in FIG. 13, the segment (block) in which the first reflecting surface portion 3L1 of the reflector 3L is inclined by θL4 (about 15 ° in this example) with respect to the Y axis (vertical axis, vertical axis). (3L11, 3L12, 3L13, 3L14, 3L15, 3L16). Further, the second reflecting surface portion 3L2 of the reflector 3L is divided into five segments (blocks) substantially parallel to the Y axis (3L21, 3L22, 3L23, 3L24, 3L25). As a result, as shown in FIG. 14, the first reflecting surface portion 3L1 (3L11, 3L12, 3L13, 3L14, 3L15, 3L16) of the reflector 3L divided into six parts has the first cut-off lines C1, C1L. A light distribution pattern portion P1 (P11, P12, P13, P14, P15, P16) is formed. Further, the second light distribution pattern portion P2 (P21, P22, P2) having the second cutoff lines C2, C2L by the second reflecting surface portion 3L2 (3L21, 3L22, 3L23, 3L24, 3L25) of the reflector 3L divided into five. P23, P24, P25) are formed.

  As shown in FIGS. 14 and 15, the first cut-off lines C1, C1L, and C1R are formed by the first reflecting surface portions 3L1 (3L11 to 3L16) and 3R1 (3R11 to 3R16) of the reflectors 3L and 3R. The first light distribution pattern part P1 (P11 to P16) including the second reflection surface part 3L2 (3L21 to 3L26) and 3R2 (3R21 to 3R26) of the reflectors 3L and 3R is formed by the second light distribution pattern part P1 (P11 to P16). The second light distribution pattern portion P2 (P21 to P26) including cut-off lines C2, C2L, and C2R is formed, and further, the third light distribution pattern is formed by the third reflection surface portions 3L3 and 3R3 of the reflectors 3L and 3R. A portion P3 is formed, and as a result, the predetermined light distribution pattern P for passing is obtained.

  The first reflecting surface portions 3L1 (3L11 to 3L16), 3R1 (3R11 to 3R16) and the second reflecting surface portions 3L2 (3L21 to 3L26), 3R2 (3R21 to 3R26) and the third reflecting surface portion 3L3 of the reflectors 3L and 3R. 3R3 is formed by, for example, aluminum vapor deposition or silver coating, and includes a reflective surface such as a free-form surface (NURBS surface). The NURBS curved surface of the reflectors 3L and 3R is a NURBS free-form surface (Non-Uniform Rational B-Spline Surface) described in "Mathematical Elemennts for Computer Graphics" (Devid F. Rogers, J Alan Adams). is there.

  Here, in the reflector 3R, the basic light distribution pattern PR shown in FIG. 7 obtained by reversing and reflecting the light from the light source 2R to the left and right is reversed to the left and right, and the passing light shown in FIGS. 14 and 15 is used. Light distribution patterns P (the first light distribution pattern portions P1 (P11 to P16), the second light distribution pattern portions P2 (P21 to P26), and the third light distribution pattern portions P3) are formed. . That is, in the reflector 3, as a result, the light from the light source 2R is diffused (opened) right and left as it is with respect to the optical axis ZR-ZR and reflected.

  The vehicle headlamp in this embodiment is configured as described above, and the operation thereof will be described below.

  First, the light sources 2L and 2R of the headlamps 1L and 1R are turned on. Then, the light from the light sources 2L and 2R is reflected on the reflecting surfaces of the reflectors 3L and 3R, that is, the first reflecting surface portions 3L1 (3L11 to 3L16), 3R1 (3R11 to 3R16) and the second reflecting surface portions 3L2 (3L21 to 3L26). 3R2 (3R21 to 3R26) and the third reflecting surface portions 3L3 and 3R3, and as shown in FIG. 15, the light distribution pattern P (first for passing) having the first cut-off line C1 and the second cut-off line C2 A light distribution pattern portion P1 (P11 to P16), a second light distribution pattern portion P2 (P21 to P26), and a third light distribution pattern portion P3) are formed.

  The vehicle headlamp in this embodiment has the above-described configuration and action, and the effects thereof will be described below.

  The vehicle headlamps in this embodiment, that is, the headlamps 1L and 1R, as shown in FIGS. 4, 5, 9, and 10, the bulb axis Z1-Z1 is light from the reflecting surfaces of the reflectors 3L and 3R. Since the light sources 2L and 2R are attached to the reflectors 3L and 3R in a state inclined with respect to the axes ZL-ZL and ZR-ZR (Z-axis), the size of the lamp in the front-rear direction can be reduced and made compact. . Further, in the vehicle headlamps in this embodiment, that is, the headlamps 1L and 1R, the light source stripes 21 and 22 of the light sources 2L and 2R are formed by rotating the light sources 2L and 2R around the bulb axis Z1-Z1. Since the light is projected onto the first reflection surface portions 3L1, 3R1 and the second reflection surface portions 3L2, 3R2 of the reflection surfaces 2L, 2R, the first cut-off line C1 of the predetermined light distribution pattern P for passing by the light shielding stripes 21, 22 C1L, C1R and second cutoff lines C2, C2L, C2R can be accurately and clearly formed.

  In addition, the vehicle headlamps in this embodiment, that is, the headlamps 1L and 1R are the second reflecting surface portion 3L2 in which the range of the first reflecting surface portions 3L1 and 3R1 located inside the automobile C is located outside the automobile C. Since it is wider than the range of 3R2, the luminous intensity (illuminance, light quantity) of the first light distribution pattern portion P1 (P11 to P16) including the first cutoff lines C1, C1L, and C1R located on the traveling lane side can be increased. . As a result, the vehicular headlamps in this embodiment, that is, the headlamps 1L and 1R, can improve visibility in the distance on the traveling lane side and contribute to traffic safety.

  Furthermore, the vehicle headlamps in this embodiment, that is, the headlamps 1L and 1R, are from the optical axes ZL-ZL and ZR-ZR (Z-axis) of the first reflecting surface portions 3L1 and 3R1 located inside the automobile C. Since the distance to the inner edge of the automobile C is longer than the distance from the optical axes ZL-ZL, ZR-ZR of the second reflecting surface portions 3L2, 3R2 located outside the automobile C to the outer edge of the automobile C. In addition, the present invention can be applied to a vehicle design in which the wraparound portions on the left and right sides of the front portion of the automobile C are slanted (curved and inclined) from the inside to the outside of the automobile C. In other words, it can be used for designs with large lateral slants.

  In the above-described embodiment, the light distribution pattern P for passing has the first cut-off line C1, C1L, C1R and the second cut-off line C2, C2L, C2R as the predetermined light distribution pattern having the cut-off line. . However, in the present invention, other light distribution patterns, for example, a light distribution pattern for a highway in which the cut-off line is located slightly above the light distribution pattern for passing may be used. Or the light distribution pattern for fog | mists, ie, the light distribution pattern which has a cut-off line, may be sufficient.

  Moreover, in the said Example, headlamp 1L, 1R is demonstrated. However, in the present invention, other vehicle headlamps such as fog lamps may be used.

1 is a schematic plan view of an automobile equipped with left and right headlamps showing an embodiment of a vehicle headlamp according to the present invention. Similarly, it is a side view showing a light source. Similarly, it is the III arrow directional view (front view) in FIG. Similarly, it is a schematic cross-sectional view (horizontal cross-section) showing the right headlamp. Similarly, it is a schematic perspective view showing a right headlamp. Similarly, it is a schematic front view showing a right headlamp. Similarly, it is schematic explanatory drawing which shows the basic light distribution pattern by the right side headlamp. Similarly, it is a schematic front view showing the reflecting surface of the reflector of the right headlamp. Similarly, it is a schematic cross-sectional view (horizontal cross-section) showing the left headlamp. Similarly, it is a schematic perspective view showing a left headlamp. Similarly, it is a schematic front view showing the left headlamp. Similarly, it is a schematic explanatory view showing a basic light distribution pattern by the left headlamp. Similarly, it is a schematic front view showing the reflecting surface of the reflector of the left headlamp. Similarly, it is schematic explanatory drawing which shows the 1st light distribution pattern part and 2nd light distribution pattern part which are formed of the 1st reflective surface part and 2nd reflective surface part of the reflector of a right-and-left headlamp. Similarly, it is a schematic explanatory view showing a predetermined light distribution pattern for passing, which is formed by left and right headlamps.

Explanation of symbols

1L left headlamp (vehicle headlamp)
1R Right headlamp (vehicle headlamp)
2L, 2R Light source 20 Arc tube 21, 22 Shading stripe (shading coating)
23 Outer tube 24 Base 25 Shade 3L, 3R Reflector 3L1-3L16, 3R1-3R16 First reflecting surface 3L2-3L25, 3R2-3R26 Second reflecting surface 3L3, 3R3 Third reflecting surface 4L, 4R Light source insertion hole C Automobile (vehicle) )
F Forward B Backward U Upward D Down L Left direction R Right direction HL-HR Left and right horizontal lines VU-VD Up and down vertical lines ZL-ZL Left headlamp optical axis ZR-ZR Right headlamp optical axis ZC -ZC Vehicle axis Z1-Z1 Light source axis (bulb axis)
P Light distribution pattern for passing (predetermined light distribution pattern)
P1 to P16 First light distribution pattern portion P2 to P26 Second light distribution pattern portion P3 Third light distribution pattern portion X X axis of three-dimensional orthogonal coordinate Y Y axis of three-dimensional orthogonal coordinate Z Z axis of three-dimensional orthogonal coordinate C1 , C1L, C1R 1st cut-off line C2, C2L, C2R 2nd cut-off line

Claims (3)

In a vehicle headlamp that irradiates a predetermined light distribution pattern having a cut-off line in front of the vehicle,
A light source;
A reflector provided with a reflecting surface that reflects light from the light source and irradiates the light distribution pattern in front of the vehicle;
With
The light distribution pattern has a first cutoff line located on the traveling lane side and a second cutoff line located on the opposite lane side,
The light source is provided with a light shielding stripe that forms the first cutoff line and the second cutoff line in the direction of the light source axis,
The light source is attached to the reflector in a state where the light source axis is inclined with respect to the optical axis of the reflecting surface and rotated around the light source axis.
The reflection surface includes a first reflection surface portion that forms a first light distribution pattern portion including the first cutoff line, a second reflection surface portion that forms a second light distribution pattern portion including the second cutoff line, and A third reflecting surface portion that forms a third light distribution pattern portion located between the first light distribution pattern portion and the second light distribution pattern portion,
A vehicle headlamp characterized by that. The light source is attached to the reflector in a state of being inserted from the rear side of the vehicle to the front side and toward the outside of the vehicle in the direction of the light source axis.
The first reflective surface portion is located inside the vehicle, and the second reflective surface portion is located outside the vehicle,
The range of the first reflective surface portion is wider than the range of the second reflective surface portion.
The vehicle headlamp according to claim 1. The light source is attached to the reflector in a state of being inserted from the rear side of the vehicle to the front side and toward the outside of the vehicle in the direction of the light source axis.
The first reflective surface portion is located inside the vehicle, and the second reflective surface portion is located outside the vehicle,
The distance from the optical axis of the first reflective surface portion to the inner end of the vehicle is longer than the distance from the optical axis of the second reflective surface portion to the outer end of the vehicle,
The vehicle headlamp according to claim 1 or 2, characterized in that

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