JP2009021031A - Vehicle headlamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that in a conventional vehicle headlamp, light shielded by a shade, out of the light from a light source, cannot be utilized effectively when it is reflected by a reflector. <P>SOLUTION: The vehicle headlamp is provided with: a second reflecting surface 16 which reflects the light L2 shielded by a shade 5 in a prescribed direction when light from a discharge lamp 2 is reflected by a first reflecting surface 9; and a third reflecting surface 17 which reflects the reflection light L3 from the second reflecting surface 16 to the front of the vehicle as an additional light distribution pattern SP, WP. The second reflecting surface 16 is an elliptical reflection surface having a first focus F21 located at the discharge lamp 2 and a second focus F22 located at the upper part than and to the front of the discharge lamp 2. The third reflecting surface 17 is a reflecting surface having the second focus F22 of the second reflecting surface 16 as a pseudo light source. As a result, the vehicle headlamp can effectively utilize the light L2 shielded by the shade 5 when the light from the light source 2 is reflected by the first reflecting surface, owing to the second reflecting surface 16 and the third reflecting surface 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector-type vehicle headlamp that is a headlamp, a fog lamp, or the like and irradiates a light distribution pattern having a cut-off line in front of the vehicle.

  Conventionally, this type of projector-type vehicle headlamp is known (see, for example, Patent Document 1 and Patent Document 2). Hereinafter, a conventional vehicle headlamp will be described. A conventional vehicle headlamp reflects light from a light source with a reflector to form a light distribution pattern having a cut-off line, and direct light that does not enter the reflector from the light source is generated by the first additional reflector and the second reflector. It is reflected and irradiated to the front of the vehicle. As a result, the conventional vehicular headlamp effectively uses direct light that does not enter the reflector from the light source.

  However, conventional vehicle headlamps effectively use direct light that does not enter the reflector from the light source, and effectively use light that is blocked by the shade when reflected by the reflector. Not what you want.

JP-A-2005-1000076 JP 2006-156191 A

  The problem to be solved by the present invention is that the conventional vehicle headlamp cannot effectively use the light from the light source that is blocked by the shade when reflected by the reflector.

  According to the present invention (the invention according to claim 1), a second reflecting surface that reflects light blocked by the shade in a direction not blocked by the shade when reflected by the first reflecting surface among the light from the light source, and the first A third reflecting surface that reflects the reflected light from the two reflecting surfaces to the front of the vehicle as an additional light distribution pattern, and the second reflecting surface is located above and ahead of the light source, the first focal point located at the light source The third reflective surface is a reflective surface having a second focal point of the second reflective surface as a pseudo light source.

  In the present invention (the invention according to claim 2), the third reflecting surface reflects the reflected light from the second reflecting surface as a condensing type additional light distribution pattern near the cut-off line of the light distribution pattern. It is characterized by.

  Further, according to the present invention (the invention according to claim 3), the third reflecting surface reflects the reflected light from the second reflecting surface as a diffusion type additional light distribution pattern near the cutoff line of the light distribution pattern. Features.

  Furthermore, the present invention (the invention according to claim 4) is characterized in that the third reflecting surface is disposed inside the vehicle with respect to the light source, the reflector, the projection lens, and the shade.

  Furthermore, the present invention (the invention according to claim 5) is characterized in that the third reflecting surface is disposed outside the vehicle with respect to the light source, the reflector, the projection lens, and the shade.

  Furthermore, the present invention (the invention according to claim 6) is characterized in that the second reflecting surface is provided on the reflector.

  Furthermore, according to the present invention (the invention according to claim 7), the light source is a discharge lamp, and the second reflecting surface is shaded by a protective tube of the discharge lamp and a color due to iodide in the discharge lamp. It is provided in a zone that avoids the zone.

  The vehicle headlamp according to the present invention (the invention according to claim 1) reflects the light, which is blocked by the shade when reflected by the first reflecting surface, out of the light from the light source in a direction not blocked by the shade. The reflection surface and the third reflection surface that reflects the reflected light from the second reflection surface as an additional light distribution pattern to the front of the vehicle, and when the light from the light source is reflected by the first reflection surface, it is blocked by the shade. Can be used effectively.

  In addition, the vehicle headlamp according to the present invention (the invention according to claim 1) causes the reflected light from the second reflecting surface to fall below the light source on the third reflecting surface by means for solving the above-mentioned problems. Since the light can be easily and reliably reflected, the additional light distribution pattern can be controlled easily and reliably without giving glare, and the additional light distribution pattern without giving glare can be easily and A light distribution design can be surely performed. That is, in the vehicle headlamp of the present invention (the invention according to claim 1), the second reflecting surface has a first focal point located at the light source and a second focal point located above and ahead of the light source. And the third reflecting surface is a reflecting surface having the second focal point of the second reflecting surface as a pseudo light source. Therefore, when the light from the light source is reflected by the first reflecting surface, it is blocked by the shade. The reflected light is reflected upward and forward from the light source to the third reflective surface by the second reflective surface, and the reflected light reflected from the second reflective surface above and forward from the light source is added by the third reflective surface. As a light distribution pattern, it can be reflected easily and reliably in front of the vehicle and below the light source. As a result, the vehicle headlamp of the present invention (the invention according to claim 1) can easily and reliably prevent glare due to the additional light distribution pattern.

  In the vehicle headlamp of the present invention (the invention according to claim 2), the reflected light from the second reflective surface is the third reflective surface and the vicinity of the cut-off line of the light distribution pattern as a condensing type additional light distribution pattern. Since it is reflected in the distance, the visibility in the distance is improved.

  Furthermore, the vehicle headlamp according to the present invention (the invention according to claim 3) cuts the light distribution pattern as a diffuse (radiation) type additional light distribution pattern with the third reflection surface reflecting light from the second reflection surface. Since the reflection is made in the vicinity of the off-line, the visibility of the left and right turns of the road shoulder, curved road (curve) and intersection is improved.

  Furthermore, in the vehicle headlamp according to the present invention (the invention according to claim 4), the third reflecting surface is disposed on the inner side of the vehicle with respect to the light source, the reflector, the projection lens, and the shade. Is suitable for vehicles with space compared to the outside of the vehicle.

  Furthermore, in the vehicle headlamp of the present invention (the invention according to claim 5), the third reflecting surface is disposed outside the vehicle with respect to the light source, the reflector, the projection lens, and the shade. Is suitable for vehicles with space compared to the inside of the vehicle.

  Furthermore, in the vehicle headlamp according to the present invention (the invention according to claim 6), since the second reflecting surface is provided on the reflector, a conventional reflector provided with a first reflector separate from the reflector is provided. Compared with a vehicle headlamp, heat generated in the light source can be efficiently released to the outside of the reflector. As a result, the vehicular headlamp according to the present invention (the invention according to claim 6) does not accumulate heat in the reflector and is preferable for the light source.

  Furthermore, the vehicle headlamp according to the present invention (the invention according to claim 7) is provided in a zone that avoids a zone that is shaded by the protective tube of the discharge lamp and a zone that is colored by iodide in the discharge lamp. With the second reflecting surface, the light from the discharge lamp can be used more effectively, and the light with an unfavorable color is not irradiated in front of the vehicle.

  Hereinafter, five examples of embodiments of a vehicle headlamp according to the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments. In the drawings, the symbol “F” indicates the front side of the vehicle (the forward direction side of the vehicle). The symbol “B” indicates the rear side of the vehicle. The symbol “U” indicates the upper side when the front side is viewed from the driver side. The symbol “D” indicates the lower side when the front side is viewed from the driver side. The symbol “L” indicates the left side when the front side is viewed from the driver side. The symbol “R” indicates the right side when the front side is viewed from the driver side. The symbol “VU-VD” indicates vertical lines on the top and bottom of the screen. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen. Further, in this specification or claims, “up, down, front, back, left, right” means “up, down, front, back, when the vehicle lamp according to the present invention is mounted on a vehicle. "Left, right".

  1 to 8 show Embodiment 1 of a vehicle headlamp according to the present invention. Hereinafter, the configuration of the vehicle headlamp according to the first embodiment will be described. In FIG. 1, reference numeral 1 denotes a vehicle headlamp according to the first embodiment. The vehicular headlamp 1 is, for example, a projector-type headlamp that is provided on each of the left and right sides of a front portion of an automobile (vehicle). The vehicular headlamp 1 is a left-handed vehicular headlamp, and is a vehicular headlamp that is mounted on the right side of the front portion of an automobile.

  As shown in FIG. 1, the vehicle headlamp 1 includes a discharge lamp 2 as a light source, a reflector 3, a projection lens (condensing lens, convex lens) 4, a shade 5, a frame 6, and a second A reflective surface (first additional reflective surface, first auxiliary reflective surface, first sub-reflective surface) 16, a third reflective surface (second additional reflective surface, second auxiliary reflective surface, second sub-reflective surface) 17, A lamp housing (not shown) and a lamp lens (not shown) (for example, a transparent outer lens) are provided.

  The discharge lamp 2, the reflector 3, the projection lens 4, the shade 5, the frame 6, the second reflecting surface 16, and the third reflecting surface 17 constitute a lamp unit. The lamp unit is disposed, for example, via an optical axis adjusting mechanism (not shown) in a lamp chamber (not shown) defined by the lamp housing and the lamp lens.

  The discharge lamp 2 is a discharge lamp such as a high-pressure metal vapor discharge lamp such as a metal halide lamp or a high-intensity discharge lamp (HID). The discharge lamp 2 is detachably attached to the reflector 3 via a socket 7. The discharge lamp 2 has a light emitting unit 8. The discharge lamp 2 may be a halogen bulb or an incandescent bulb in addition to the discharge lamp.

  The reflector 3 has a hollow concave shape with an opening on the front side (light irradiation direction side of the vehicle headlamp 1, the projection lens 4 side) and a closed rear side. A first reflective surface (existing reflective surface, main reflective surface, main reflective surface) 9 is formed on the inner concave surface of the reflector 3 by aluminum deposition or silver coating. The first reflecting surface 9 reflects light emitted from the light emitting unit 8 of the discharge lamp 2 to the front side, that is, the shade 5 and the projection lens 4 side.

  The first reflective surface 9 is an elliptical reflective surface. That is, the first reflecting surface 9 is a free curved surface (NURBS curved surface) reflecting surface based on an ellipse (reference, basic tone). The free curved surface (NURBS curved surface) reflecting surface based on the ellipse is a reflecting surface in which the vertical cross section in FIG. 1 forms an ellipse, and the horizontal cross section (not shown) forms a parabola or a deformed parabola. The first reflecting surface 9 has a first focal point F11, a second focal point F12, and an optical axis Z1-Z1. The second focal point F12 is a focal line on a horizontal section, that is, a curved focal line with both ends positioned on the front side and the center positioned on the rear side as viewed from above (plane). The free-form surface (NURBS surface) of the first reflecting surface 9 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). ). The first reflecting surface 9 may be a reflecting surface composed of a simple spheroid having a first focal point, a second focal point, and an optical axis. In this case, the second focal point is not a focal line but a focal point.

  Since the first reflecting surface 9 of the inner concave surface of the reflector 3 is an elliptical reflecting surface, the light emission range of the light from the light emitting part 8 of the discharge lamp 2 is wider than that of the semiconductor light source. Can be reflected over the entire area. Thereby, the light from the light emitting part 8 of the discharge lamp 2 can be effectively used over a wide range.

  A through hole 10 is provided at a location where the optical axis Z <b> 1-Z <b> 1 of the first reflecting surface 9 intersects in the closed portion on the rear side of the reflector 3. The socket 7 is detachably attached to the edge of the through hole 10 in a state where the discharge lamp 2 is inserted into the reflector 3 from the through hole 10. As a result, the discharge lamp 2 is detachably attached to the reflector 3 via the socket 7. The light emitting unit 8 of the discharge lamp 2 is located at or near the first focal point F11 of the first reflecting surface 9. That is, the first focal point F11 of the first reflecting surface 9 is located in the light source (the discharge lamp 2).

  The projection lens 4 is an aspherical convex lens. The front side of the projection lens 4 forms a convex aspheric surface, while the rear side of the projection lens 4 forms a flat aspheric surface (plane). The projection lens 4 has a lens focal point (a meridional image plane that is a focal plane on the object space side) F4 and a lens optical axis Z4-Z4. The lens focal point F4 of the projection lens 4 and the second focal point F12 of the first reflecting surface 9 are coincident (including substantially coincident). Therefore, the lens focal point F4 of the projection lens 4 is a focal line, like the second focal point F12 of the first reflecting surface 9. Further, as shown in FIG. 1, the optical axis Z4-Z4 of the projection lens 4 and the optical axis Z1-Z1 of the first reflecting surface 9 are coincident (including substantially coincidence). The optical axis Z4-Z4 of the projection lens 4 and the optical axis Z1-Z1 of the first reflecting surface 9 may be shifted left and right. Further, the lens focal point F4 of the projection lens 4 is not a focal line but a focal point as in the case of the second focal point F12 of the first reflecting surface 9 when the first reflecting surface 9 is a reflecting surface made of a simple spheroid. It becomes.

  The shade 5 is made of a plate member that is inexpensive to manufacture, and has a plate shape that covers the entire opening on the front side of the reflector 3. An opening 11 is provided at the center of the shade 5. The shade 5 shields a part of the reflected light from the first reflecting surface 9 toward the projection lens 4, and passes through the opening 11 and the remaining reflected light L 1 that is not shielded by the shade 5. A predetermined light distribution pattern P having a cut-off line (lower horizontal cut-off line CL1, oblique cut-off line CL2, upper horizontal cut-off line CL3) and an elbow point E (intersection of the lower horizontal cut-off line CL1 and the oblique cut-off line CL2), for example, The passing light distribution pattern P shown in FIGS. 5 and 6 is formed. The elbow point E is a point on the vertical line VU-VD on the top and bottom of the screen and below the horizontal line HL-HR on the left and right of the screen for measuring the light intensity value of the passing light distribution pattern P. It becomes the standard.

  At the lower edge of the opening 11 of the shade 5, there are an edge (upper horizontal edge 12, oblique edge 13, lower horizontal edge 14) and elbow point 15 (intersection of the upper horizontal edge 12 and oblique edge 13). Is provided. The edges (upper horizontal edge 12, oblique edge 13, lower horizontal edge 14) and elbow point 15 are the cut-off line (lower horizontal cut-off line CL1, oblique cut-off line CL2, upper horizontal cut) of the light distribution pattern P for passing. The off-line CL3) and the elbow point E are formed respectively. The elbow point 15 is located at or near the lens focal point F4 of the projection lens 4, or at the second focal point F12 of the reflecting surface 9.

  The portion below the opening 11 of the shade 5 is a part of the reflected light mainly from the lower portion of the reflective surface 9, and is a cut-off line CL of the passing light distribution pattern P. It shields the reflected light L2 irradiated to the upper side. On the other hand, the part above the opening 11 of the shade 5 is a part of the reflected light from the reflecting surface 9 and shields the reflected light irradiated to the lower side of the passing light distribution pattern P. To do.

  The frame 6 has a cylindrical shape. The entire periphery of the projection lens 4 is attached to the inner peripheral surface of the front end of the frame 6. As a result, the projection lens 4 is fixedly held on the frame 6. The reflector 3 and the shade 5 are also fixedly held on the frame 6.

  Of the inner concave surface of the reflector 3 (the first reflecting surface 9), the light emitting part 8 of the discharge lamp 2 (the optical axis Z1-Z1 of the first reflecting surface 9 and the optical axis Z4-Z4 of the projection lens 4). The second reflecting surface 16 is provided on the lower side and the right side. The second reflection surface 16 is a direction in which light L2 blocked by the shade 5 when reflected by the first reflection surface 9 among the light from the light emitting unit 8 of the discharge lamp 2 is not blocked by the shade 5. It is to be reflected. The second reflecting surface 16 has a first focal point F21 located in the light emitting unit 8 of the discharge lamp 2, and is above, forward and left of the light emitting unit 8 of the discharge lamp 2, and is more than the shade 5. This is an elliptical reflecting surface having a second focal point F22 located in front. The elliptical reflective surface of the second reflective surface 16 is a free curved surface (NURBS curved surface) based on an ellipse (NURBS curved surface), or simply rotated, like the elliptical reflective surface of the first reflective surface 9. It is a reflective surface consisting of an ellipsoid. The first focal point F21 of the second reflecting surface 16, the first focal point F11 of the first reflecting surface 9, and the light emitting unit 8 of the discharge lamp 2 are coincident (including substantially coincident).

  As shown in FIG. 2B, the second reflecting surface 16 is provided in a predetermined zone Z40 of the inner concave surface (the first reflecting surface 9) of the reflector 3 when viewed from the front. The predetermined zone Z40 is the iodide deposited in the zone Z10 shadowed by the protective tube 20 of the discharge lamp 2 and the discharge lamp 2 (the arc tube (the light emitting portion 8) or the outer tube of the discharge lamp 2). This is a zone Z20 in which a color tone (not shown) appears, and a zone Z40 that avoids the zone Z30 cut off by the shade 5. The central angle of the zone Z10 that is shaded by the protective tube 20 of the discharge lamp 2 and the zone Z20 that is colored by the iodide in the discharge lamp 2 is about 30 °, and the zone that is cut off by the shade 5 The central angle of Z30 is about 15 °. As a result, the central angle of the predetermined zone Z40 of the second reflecting surface 16 is about 45 °. That is, the predetermined zone Z40 of the second reflecting surface 16 is a zone of about 15 ° to about 60 ° in the counter-statistical direction from the horizontal line HH. The zone Z30 is a zone that is included in the existing first reflecting surface 9 and that forms the passing light distribution pattern P (mainly, the portion near the upper horizontal cutoff line CL3).

  An auxiliary reflector 18 is located on the inner side of the vehicle, that is, on the left side of the discharge lamp 2, the reflector 3, the projection lens 4, and the shade 5 and in front of the discharge lamp 2, the reflector 3, and the shade 5. Is arranged. The auxiliary reflector 18 is provided with the third reflecting surface 17. The third reflecting surface 17 uses the reflected light L3 from the second reflecting surface 16 as a condensing type additional light distribution pattern SP (see FIG. 7) in the vicinity of the oblique cutoff line CL2 of the passing light distribution pattern P. It is to be reflected. The third reflecting surface 17 is a reflecting surface that uses the second focal point F22 of the second reflecting surface 16 as a pseudo light source. The third reflecting surface 17 is a parabolic reflecting surface, for example, a reflecting surface of a free-form surface (NURBS curved surface) based on a parabola (reference, basic tone), or a reflecting surface composed of a simple rotating paraboloid. The focal point F3 of the third reflecting surface 17 and the second focal point F22 of the second reflecting surface 16 are coincident (including substantially coincident).

  The vehicle headlamp 1 according to the first embodiment is configured as described above, and the operation thereof will be described below.

  First, the discharge lamp 2 is turned on. Then, light is emitted from the light emitting portion 8 of the discharge lamp 2. This light is reflected by the first reflecting surface 9 of the reflector 3 toward the shade 5 and the projection lens 4. A part of the reflected light is shielded by the shade 5, and the remaining reflected light L1 (see FIGS. 1, 3, and 4) passes through the cutoff lines CL1, CL2, CL3 and the elbow point E shown in FIGS. The passing light distribution pattern P is formed. When the remaining reflected light L1 travels from the opening 11 of the shade 5 to the projection lens 4 side, the cut-off lines CL1, CL2, CL3 are caused by the edges 12, 13, 14 and the elbow point 15 of the opening 11 of the shade 5. And an elbow point E is formed. The remaining reflected light L1 passes through the projection lens 4 and is projected (radiated and irradiated) in front of the automobile as a passing light distribution pattern P.

  The light L2 (see FIGS. 1, 3, and 4) that is blocked by the shade 5 when reflected by the first reflecting surface 9 out of the light from the light emitting portion 8 of the discharge lamp 2 is an inner concave surface of the reflector 3 (see FIG. Of the first reflecting surface 9), the light emitting portion 8 of the discharge lamp 2 (the optical axis Z1-Z1 of the first reflecting surface 9 and the optical axis Z4-Z4 of the projection lens 4) is provided below and on the right side. The second reflecting surface 16 is reflected in a direction not blocked by the shade 5. That is, the light L2 is reflected by the second reflecting surface 16 having the first focal point F21 located at the light emitting portion 8 of the discharge lamp 2, and is emitted as reflected light L3 (see FIGS. 1, 3, and 4). The light travels through the opening 11 of the shade 5 toward the second focal point F <b> 22, which is located above the front side, the left side, and the front side of the shade 5.

  The reflected light L3 reflected by the second reflecting surface 16 is inside the vehicle, that is, on the left side with respect to the discharge lamp 2, the reflector 3, the projection lens 4, and the shade 5, and is more than the discharge lamp 2, the reflector 3, and the shade 5. The light is reflected by the third reflecting surface 17 of the auxiliary reflector 18 disposed in front. That is, the reflected light L3 reflected by the second reflecting surface 16 has a focal point F3 that coincides with the second focal point F22 of the second reflecting surface 16, and the second focal point F22 of the second reflecting surface 16 is the third light source that is a pseudo light source. Reflected by the reflecting surface 17. The reflected light L4 from the third reflecting surface 17 is irradiated near the oblique cutoff line CL2 of the passing light distribution pattern P shown in FIGS. 5 and 6 as a condensing type additional light distribution pattern SP (see FIG. 7). The As a result, the passing light distribution pattern P shown in FIG. 5 and FIG. 6 and the condensing type additional light distribution pattern SP shown in FIG. 7 are synthesized, and the special light distribution pattern PSP (passing light distribution pattern) shown in FIG. Pattern P + light collecting type additional light distribution pattern SP) is obtained.

  The vehicle headlamp 1 according to the first embodiment is configured and operated as described above, and the effects thereof will be described below.

  In the vehicle headlamp 1 according to the first embodiment, the light L2 that is blocked by the shade 5 when reflected by the first reflecting surface 9 out of the light from the light emitting portion 8 of the discharge lamp 2 is not blocked by the shade 5. The second reflecting surface 16 that reflects in the direction and the third reflecting surface that reflects the reflected light L3 from the second reflecting surface 16 to the front of the vehicle as an additional light distribution pattern (condensing type additional light distribution pattern SP) 17, the light L2 blocked by the shade 5 when reflected by the first reflecting surface 9 out of the light from the light emitting unit 8 of the discharge lamp 2 can be used effectively.

  Moreover, in the vehicle headlamp 1 according to the first embodiment, the reflected light L3 from the second reflecting surface 16 is easily and reliably reflected below the light emitting portion 8 of the discharge lamp 2 by the third reflecting surface 17. Therefore, the additional light distribution pattern (condensing type additional light distribution pattern SP) can be easily and reliably controlled so as not to give glare, and the additional light distribution which does not give glare. The light distribution design of the pattern (condensing type additional light distribution pattern SP) can be easily and reliably performed. That is, in the vehicle headlamp 1 according to the first embodiment, the second reflecting surface 16 is located above the first focal point F21 positioned at the light emitting unit 8 of the discharge lamp 2 and the light emitting unit 8 of the discharge lamp 2 and The third reflecting surface 17 is a reflecting surface having the second focal point F22 of the second reflecting surface 16 as a pseudo light source (focal point F3). Thereby, the vehicle headlamp 1 according to the first embodiment secondly reflects the light L2 that is blocked by the shade 5 when reflected by the first reflecting surface 9 out of the light from the light emitting portion 8 of the discharge lamp 2. The surface 16 is reflected upward and forward from the light emitting portion 8 of the discharge lamp 2 to the third reflecting surface 17 side, and is reflected upward and forward from the light emitting portion 8 of the discharge lamp 2 by the second reflecting surface 16. The reflected light L3 can be easily and reliably reflected on the third reflecting surface 17 as an additional light distribution pattern (condensing type additional light distribution pattern SP) in front of the vehicle and below the light emitting portion 8 of the discharge lamp 2. it can. As a result, the vehicular headlamp 1 according to the first embodiment can easily and reliably prevent glare due to the additional light distribution pattern (condensing type additional light distribution pattern SP).

  Further, in the vehicle headlamp 1 according to the first embodiment, the reflected light L3 from the second reflecting surface 16 on the third reflecting surface 17 is used as the condensing type additional light distribution pattern SP. Since the reflection is performed in the vicinity of the oblique cut-off line CL2, the distant visibility is improved.

  Further, in the vehicular headlamp 1 according to the first embodiment, the auxiliary reflector 18 and the third reflecting surface 17 are disposed inside the vehicle with respect to the discharge lamp 2, the reflector 3, the projection lens 4, and the shade 5. Therefore, it is suitable for a vehicle in which the inside of the vehicle has a space compared to the outside of the vehicle.

  Furthermore, the vehicular headlamp 1 according to the first embodiment has the second reflecting surface 16 provided on the reflector 3, so that the conventional vehicular lamp 1 is provided with a first reflector separate from the reflector so as to cover the light source. Compared with the headlamp, the heat generated in the discharge lamp 2 can be efficiently released to the outside of the reflector 3. As a result, the vehicular headlamp 1 according to the first embodiment does not accumulate heat in the reflector 3 and is preferable to the discharge lamp 2.

  Furthermore, the vehicular headlamp 1 according to the first embodiment avoids the zone Z10 which is shaded by the protective tube 20 of the discharge lamp 2 and the zone Z40 where the tint due to iodide in the discharge lamp 2 appears. The second reflecting surface 16 provided on the light source allows the light from the discharge lamp 2 to be used more effectively, and does not irradiate the front of the vehicle with light having an undesirable color. Moreover, the vehicular headlamp 1 according to the first embodiment is provided with the second reflecting surface 16 in the zone Z40 that avoids the zone Z30 that is cut off by the shade 5, so that the existing first reflecting surface 9 is not provided. There is no effect. As a result, the vehicular headlamp 1 according to the first embodiment has no influence on the existing light distribution pattern P even if the existing reflector 3 is provided with the second reflecting surface 16. There is no.

  9 and 10 show a second embodiment of a vehicle headlamp according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 8 denote the same components.

  A vehicle headlamp according to a second embodiment of the present invention will be described below. In the vehicular headlamp 1 according to the second embodiment, the third reflecting surface 17 converts the reflected light L3 from the second reflecting surface 16 as a diffusion type additional light distribution pattern WP shown in FIG. Is reflected in the vicinity of the upper horizontal cut-off line CL3.

  Since the vehicular headlamp 1 according to the second embodiment is configured as described above, the reflected light L5 (see FIGS. 3 and 4) from the third reflecting surface 17 is a diffusion type additional light distribution pattern WP. As shown in FIG. 9, the light is irradiated near the upper horizontal cutoff line CL3 of the passing light distribution pattern P shown in FIGS. As a result, the passing light distribution pattern P shown in FIG. 5 and FIG. 6 and the diffusion type additional light distribution pattern WP shown in FIG. 9 are combined, and the special light distribution pattern PWP (passing light distribution pattern shown in FIG. P + diffusion type additional light distribution pattern WP) is obtained.

  Since the vehicular headlamp 1 according to the second embodiment is configured and operated as described above, the diffused (radiated) type of the reflected light L3 from the second reflecting surface 16 by the third reflecting surface 17 is shown in FIG. As the additional light distribution pattern WP is reflected near the upper horizontal cut-off line CL3 of the passing light distribution pattern P shown in FIGS. 5 and 6, the left turn and right turn visibility at the road shoulder, the curved road (curve) and the intersection is improved. Is done.

  FIGS. 11-13 shows Example 3 of the vehicle headlamp according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 10 denote the same components.

  A vehicle headlamp according to a third embodiment of the present invention will be described below. In the vehicular headlamp 100 according to the third embodiment, the third reflecting surface 170 is disposed outside the vehicle with respect to the light emitting unit 8, the reflector 3, the projection lens 4, and the shade 5 of the discharge lamp 2. It is.

  That is, of the inner concave surface (first reflective surface 9) of the reflector 3, the light emitting portion 8 of the discharge lamp 2 (the optical axis Z1-Z1 of the first reflective surface 9 and the optical axis Z4-Z4 of the projection lens 4) is below. A second reflecting surface 160 is provided on the side and left side. The second reflecting surface 160 reflects light L2 blocked by the shade 5 when reflected by the first reflecting surface 9 out of light from the light emitting unit 8 of the discharge lamp 2 in a direction not blocked by the shade 5. . The second reflecting surface 160 is located at the first focal point F210 located at the light emitting part 8 of the discharge lamp 2, and above the front, right and right of the light emitting part 8 of the discharge lamp 2, and to the right of the reflector 3. 5 is an elliptical reflecting surface having a second focal point F220 located rearward of 5. The elliptical reflecting surface of the second reflecting surface 160 is a free-form surface based on an ellipse (reference, base tone), similarly to the ellipsoidal reflecting surfaces of the second reflecting surface 16 and the first reflecting surface 9 of the first and second embodiments. The reflection surface is a (NURBS curved surface) reflection surface or a simple spheroid surface. The first focal point F210 of the second reflecting surface 160, the first focal point F11 of the first reflecting surface 9, and the light emitting unit 8 of the discharge lamp 2 are coincident (including substantially coincident).

  As shown in FIG. 2 (B), the second reflective surface 160 is an inner concave surface (the first reflective surface 9) of the reflector 3 when viewed from the front, as in the second reflective surface 16 of the first embodiment. ) In a predetermined zone Z400. The predetermined zone Z400 is an iodide deposited in the zone Z10 which is shaded by the protective tube 20 of the discharge lamp 2 and the discharge lamp 2 (the arc tube (the light emitting portion 8) or the outer tube of the discharge lamp 2). This is the zone Z400 that avoids the zone Z20 in which the color due to (not shown) appears. The central angle of the zone Z10 which is shaded by the protective tube 20 of the discharge lamp 2 and the zone Z20 where the color due to iodide in the discharge lamp 2 appears is about 30 °. As a result, the central angle of the predetermined zone Z400 of the second reflecting surface 160 is about 60 °. That is, the predetermined zone Z400 of the second reflecting surface 160 is a zone of about 0 ° to about 60 ° in the clockwise direction from the horizontal line HH.

  An auxiliary reflector (second auxiliary reflector) 180 is disposed outside the vehicle, that is, on the right side of the vehicle with respect to the discharge lamp 2, the reflector 3, the projection lens 4, and the shade 5 and in front of the light emitting unit 8 of the discharge lamp 2. ing. The auxiliary reflector 180 is provided with a third reflecting surface 170. The third reflection surface 170 uses the reflected light L6 from the second reflection surface 160 as the condensing type additional light distribution pattern SP (see FIG. 7), and the oblique cut of the passing light distribution pattern P shown in FIGS. It is reflected near the offline CL2. The third reflecting surface 170 is a reflecting surface that uses the second focal point F220 of the second reflecting surface 160 as a pseudo light source. The third reflecting surface 170 is a parabolic reflecting surface, for example, a reflecting surface of a free-form surface (NURBS curved surface) based on a parabola (reference, basic tone) or a simple rotating parabolic surface. The focal point F30 of the third reflecting surface 170 and the second focal point F220 of the second reflecting surface 160 are coincident (including substantially coincident).

  A through hole 19 is provided in the right portion of the reflector 3 so that the reflected light L6 from the second reflecting surface 160 reaches the third reflecting surface 170. The through hole 19 is provided in the vicinity of the focal point F30 of the third reflecting surface 170 and the second focal point F220 of the second reflecting surface 160 where the reflected light L6 from the second reflecting surface 160 is concentrated. Therefore, the size of the through hole 19 can be reduced. As a result, the influence on the first reflecting surface 9 can be reduced.

  Since the vehicle headlamp 100 according to the third embodiment is configured as described above, when the discharge lamp 2 is turned on, light is emitted from the light emitting unit 8 of the discharge lamp 2 as in the first and second embodiments. Reflected by the first reflecting surface 9 of the reflector 3 toward the shade 5 and the projection lens 4, a part of the reflected light is shielded by the shade 5, and the remaining reflected light L 1 (see FIGS. 12 and 13) is used as shown in FIG. A passing light distribution pattern P shown in FIG. 6 is projected (radiated and irradiated) in front of the automobile.

  The light L2 (see FIGS. 12 and 13) that is blocked by the shade 5 when reflected by the first reflecting surface 9 out of the light from the light emitting portion 8 of the discharge lamp 2 is the inner concave surface (first reflecting surface) of the reflector 3. Of the surface 9), the light is reflected by the second reflecting surface 160 below and on the left side of the light emitting portion 8 of the discharge lamp 2. The reflected light L6 (see FIGS. 12 and 13) passes through the through hole 19 of the reflector 3 without being blocked by the shade 5, and is above the front side and the right side of the light emitting portion 8 of the discharge lamp 2 and on the reflector 3 The second focal point F220 is located on the right side of the shade 5 and located behind the shade 5.

  The reflected light L6 traveling to the second focal point F220 is disposed outside the vehicle, that is, on the right side of the vehicle with respect to the discharge lamp 2, the reflector 3, the projection lens 4, and the shade 5, and behind the projection lens 4 and the shade 5. The light is reflected by the third reflecting surface 170 of the auxiliary reflector 180. The reflected light L7 from the third reflecting surface 170 is irradiated near the oblique cutoff line CL2 of the passing light distribution pattern P shown in FIGS. 5 and 6 as a condensing type additional light distribution pattern SP (see FIG. 7). The As a result, the passing light distribution pattern P shown in FIG. 5 and FIG. 6 and the condensing type additional light distribution pattern SP shown in FIG. 7 are synthesized, and the special light distribution pattern PSP (passing light distribution pattern) shown in FIG. Pattern P + light collecting type additional light distribution pattern SP) is obtained.

  Since the vehicle headlamp 100 according to the third embodiment is configured and operated as described above, it is possible to achieve substantially the same operational effects as the vehicle headlamp 1 according to the first and second embodiments. it can. In particular, in the vehicle headlamp 100 according to the third embodiment, the third reflecting surface 170 and the auxiliary reflector 180 are arranged outside the vehicle with respect to the discharge lamp 2, the reflector 3, the projection lens 4, and the shade 5. Therefore, it is suitable for a vehicle in which the outside of the vehicle has a space compared to the inside of the vehicle.

  Embodiment 4 of a vehicle headlamp according to the present invention will be described below. In the vehicular headlamp 100 according to the fourth embodiment, the third reflecting surface 170 emits the reflected light L6 from the second reflecting surface 160 in substantially the same manner as the vehicular headlamp 1 according to the second embodiment. The diffused additional light distribution pattern WP shown in FIG. 9 is reflected near the upper horizontal cutoff line CL3 of the passing light distribution pattern P shown in FIGS.

  Since the vehicular headlamp 100 according to the fourth embodiment is configured as described above, the reflected light L8 (see FIGS. 12 and 13) from the third reflecting surface 170 is a diffusion type additional light distribution pattern WP. As shown in FIG. 9, the light is irradiated near the upper horizontal cutoff line CL3 of the passing light distribution pattern P shown in FIGS. As a result, the passing light distribution pattern P shown in FIG. 5 and FIG. 6 and the diffusion type additional light distribution pattern WP shown in FIG. 9 are combined, and the special light distribution pattern PWP (passing light distribution pattern shown in FIG. P + diffusion type additional light distribution pattern WP) is obtained.

  The vehicular headlamp 100 according to the fourth embodiment is configured and operated as described above. Therefore, the reflected light L6 from the second reflecting surface 160 on the third reflecting surface 170 is a diffusion (radiation) type shown in FIG. As the additional light distribution pattern WP is reflected near the upper horizontal cut-off line CL3 of the passing light distribution pattern P shown in FIGS. 5 and 6, the left turn and right turn visibility at the road shoulder, the curved road (curve) and the intersection is improved. Is done.

  14 to 17 show Embodiment 5 of a vehicle headlamp according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 13 denote the same components.

  The vehicle headlamp 101 according to the fifth embodiment is a vehicle headlamp that is a combination of the vehicle headlamp 1 according to the first embodiment and the vehicle headlamp 100 according to the fourth embodiment. Or it is a vehicle headlamp which combined the vehicle headlamp 1 concerning the said Example 2, and the vehicle headlamp 100 concerning the said Example 3. FIG.

  That is, the second reflecting surface 16 is provided in the reflector 3 on the lower side and the right side of the light emitting unit 8 of the discharge lamp 2. In addition, a third reflecting surface 17 that forms a condensing type light distribution pattern SP is disposed on the inner side of the vehicle with respect to the light emitting unit 8, the reflector 3, the projection lens 4, and the shade 5 of the discharge lamp 2. In addition, a second reflecting surface 160 is provided in the reflector 3 on the lower side and the left side of the light emitting unit 8 of the discharge lamp 2. In addition, a third reflecting surface 170 that forms a diffusion type light distribution pattern WP is disposed outside the vehicle with respect to the light emitting portion 8, the reflector 3, the projection lens 4, and the shade 5 of the discharge lamp 2.

  Alternatively, the second reflecting surface 16 is provided on the reflector 3 on the lower side and the right side of the light emitting unit 8 of the discharge lamp 2. In addition, a third reflecting surface 17 that forms a diffusion type light distribution pattern WP is disposed on the inner side of the vehicle with respect to the light emitting unit 8, the reflector 3, the projection lens 4, and the shade 5 of the discharge lamp 2. In addition, a second reflecting surface 160 is provided in the reflector 3 on the lower side and the left side of the light emitting unit 8 of the discharge lamp 2. In addition, a third reflecting surface 170 that forms a condensing type light distribution pattern SP is disposed outside the vehicle with respect to the light emitting unit 8, the reflector 3, the projection lens 4, and the shade 5 of the discharge lamp 2.

  Since the vehicle headlamp 101 according to the fifth embodiment is configured as described above, when the discharge lamp 2 is turned on, light is emitted from the light emitting unit 8 of the discharge lamp 2 as in the first and second embodiments. Reflected by the first reflecting surface 9 of the reflector 3 toward the shade 5 and the projection lens 4, a part of the reflected light is shielded by the shade 5, and the remaining reflected light L1 (see FIG. 15) is used in FIGS. 5 and 6. The passing light distribution pattern P is projected (radiated and irradiated) in front of the automobile.

  In addition, light L2 (see FIG. 15) that is blocked by the shade 5 when reflected by the first reflecting surface 9 among the light from the light emitting unit 8 of the discharge lamp 2 is transmitted from the light emitting unit 8 of the discharge lamp 2 of the reflector 3. Is also reflected by the lower and right second reflecting surface 16. The reflected light L3 (see FIG. 15) is reflected by the third reflecting surface 17 disposed on the inner side of the vehicle with respect to the light emitting unit 8, the reflector 3, the projection lens 4, and the shade 5 of the discharge lamp 2. The reflected light L4 or L5 (see FIG. 15) forms a condensing light distribution pattern SP or a diffusion light distribution pattern WP.

  Further, light L2 (see FIG. 15) that is blocked by the shade 5 when reflected by the first reflecting surface 9 among the light from the light emitting unit 8 of the discharge lamp 2 is transmitted from the light emitting unit 8 of the discharge lamp 2 of the reflector 3. Is also reflected by the lower and left second reflecting surface 160. The reflected light L6 (see FIG. 15) is reflected by the third reflecting surface 170 disposed outside the vehicle with respect to the light emitting unit 8, the reflector 3, the projection lens 4, and the shade 5 of the discharge lamp 2. A diffused light distribution pattern WP or a condensing light distribution pattern SP is formed by the reflected light L8 or L7 (see FIG. 15).

  Then, the reflected light L4 from the third reflecting surface 17 is applied to the vicinity of the oblique cutoff line CL2 of the passing light distribution pattern P shown in FIGS. 5 and 6 as a condensing type additional light distribution pattern SP (see FIG. 15). Is done. The reflected light L8 from the third reflecting surface 170 is applied to the vicinity of the upper horizontal cutoff line CL3 of the passing light distribution pattern P shown in FIGS. 5 and 6 as a diffusion type additional light distribution pattern WP (see FIG. 15). Is done. As a result, the passing light distribution pattern P shown in FIGS. 5 and 6 is combined with the condensing type additional light distribution pattern SP and the diffusion type additional light distribution pattern WP shown in FIG. A light distribution pattern PSWP (passing light distribution pattern P + condensing type additional light distribution pattern SP + diffusion type additional light distribution pattern WP) is obtained.

  Alternatively, the reflected light L5 from the third reflecting surface 17 is irradiated near the oblique cutoff line CL2 of the passing light distribution pattern P shown in FIGS. 5 and 6 as a diffusion type additional light distribution pattern WP (see FIG. 15). The The reflected light L7 from the third reflecting surface 170 is in the vicinity of the upper horizontal cutoff line CL3 on the passing light distribution pattern P shown in FIGS. 5 and 6 as a condensing type additional light distribution pattern SP (see FIG. 15). Irradiated. As a result, the passing light distribution pattern P shown in FIGS. 5 and 6 is combined with the condensing type additional light distribution pattern SP and the diffusion type additional light distribution pattern WP shown in FIG. A light distribution pattern PSWP (passing light distribution pattern P + condensing type additional light distribution pattern SP + diffusion type additional light distribution pattern WP) is obtained.

  Since the vehicular headlamp 101 according to the fifth embodiment is configured and operated as described above, the reflected light L3 from the second reflecting surface 16 is condensed by the third reflecting surface 17 and the additional light distribution pattern SP of the condensing type. The light distribution pattern for passing is reflected in the vicinity of the oblique cut-off line CL2 of the light distribution pattern P for passing and the reflected light L6 from the second reflecting surface 160 is diffused as the additional light distribution pattern WP of the third reflecting surface 170. Since the light is reflected near the upper horizontal cut-off line CL3 of P, the distant visibility and the visibility of the left and right turns at the road shoulder, the curved road (curve), and the intersection are improved.

  Alternatively, the reflected light L3 from the second reflecting surface 16 is reflected by the third reflecting surface 17 to the vicinity of the upper horizontal cutoff line CL3 of the passing light distribution pattern P as a diffusion type additional light distribution pattern WP, and the third reflection is performed. The surface 170 reflects the reflected light L6 from the second reflecting surface 160 as a condensing type additional light distribution pattern SP in the vicinity of the oblique cut-off line CL2 of the passing light distribution pattern P. Visibility of curved roads (curves) and left and right turns at intersections is improved.

  Hereinafter, examples other than Examples 1, 2, 3, 4, and 5 will be described. In the said Example 1, 2, 3, 4, 5, the headlamp is demonstrated as a vehicle headlamp. However, in the present invention, the vehicle headlamp may be a lamp other than the headlamp, such as a fog lamp.

  In the first, second, third, fourth, and fifth embodiments, a projector-type headlamp that can obtain the passing light distribution pattern P having the cut-off lines CL1, CL2, and CL3 as the predetermined light distribution pattern will be described. Is. However, in the present invention, the obtained predetermined light distribution pattern is not particularly limited. For example, the predetermined light distribution pattern may be an expressway light distribution pattern having a cut-off line.

  Further, in the first, second, third, fourth, and fifth embodiments, a vehicle headlamp for left-hand traffic is described. However, the present invention can also be applied to a vehicle headlight for right-hand traffic. In this case, the edges 11, 12, and 13 of the shade 5 are reversed left and right, the cut-off lines CL1, CL2, and CL3 of the passing light distribution pattern P are reversed left and right, and the second reflecting surfaces 16, 160, and third reflection are reversed. The surfaces 17 and 170 and the auxiliary reflectors 18 and 180 are reversed right and left.

  In the first, second, third, fourth, and fifth embodiments, the bulb axis of the discharge lamp 2 is disposed on the optical axis Z1-Z1 on the horizontal plane including the optical axis Z1-Z1 of the first reflecting surface 9. It is a so-called vertical type light source. However, in the present invention, it may be a so-called oblique insertion type light source in which the bulb axis of the discharge lamp is arranged so as to intersect the optical axis on the horizontal plane including the optical axis of the reflecting surface. It may be a so-called transverse type light source in which the bulb axis of the electric lamp is arranged so as to be orthogonal to the optical axis on a horizontal plane including the optical axis of the reflecting surface.

  Furthermore, in the first, second, third, fourth, and fifth embodiments, the so-called horizontal insertion type in which the bulb axis of the discharge lamp 2 is disposed on the horizontal plane including the optical axes Z1 to Z1 of the first reflecting surface 9. The light source. However, in the present invention, a so-called upper or lower light source in which the bulb axis of the discharge lamp intersects or is orthogonal to a horizontal plane including the optical axis of the reflecting surface may be used.

  In the first, second, third, fourth, and fifth embodiments, the materials of the reflector 3, the projection lens 4, the shade 5, and the frame 6 are not particularly limited. For example, the reflector 3 and the frame 6 may be made of aluminum die casting or a resin member. The projection lens 4 may be made of glass or a resin member. Further, the shade 5 may be made of a single plate member made of aluminum die casting or a resin member, or may be made of at least two thin steel plates or thin plate resin members.

  Furthermore, in the first, second, third, fourth, and fifth embodiments, the shade 5 is composed of a single plate member that covers the entire opening on the front side of the reflector 3, and light is projected to the projection lens 4 side in the center. An opening 11 for passing through is provided. However, in the present invention, a shade made of one plate member or at least two thin plate members covering the lower half of the opening on the front side of the reflector may be used. In this case, an edge and an elbow point are respectively provided on the upper edge of the shade.

  Furthermore, in the first, second, third, fourth, and fifth embodiments, the optical axis Z1-Z1 of the first reflecting surface 9 (the optical axis Z4-Z4 of the projection lens 4) and the second of the first reflecting surface 9 are used. A focal point F12 (focal point F4 of the projection lens 4) is located on the upper surface of the shade 5. However, in the present invention, the optical axis may be positioned above or below the top surface of the shade, and the second focal point may be positioned in front of or behind the shade.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view (vertical cross-sectional view) of the lamp unit which shows Example 1 of the vehicle headlamp concerning this invention. Similarly, it is a front view which shows a lamp unit. Similarly, it is the III-III sectional view taken on the line in FIG. Similarly, it is the IV-IV sectional view taken on the line in FIG. Similarly, it is explanatory drawing which shows the light distribution pattern for passing. Similarly, it is explanatory drawing which shows the light distribution pattern for passing obtained by computer simulation. Similarly, it is explanatory drawing which shows the condensing type additional light distribution pattern obtained by computer simulation. Similarly, it is explanatory drawing which shows the special light distribution pattern of the state which synthesize | combined the light distribution pattern for passing obtained by the computer simulation shown in FIG. 6, and the condensing type additional light distribution pattern obtained by the computer simulation shown in FIG. . It is explanatory drawing which shows Example 2 of the vehicle headlamp concerning this invention, and shows the diffusion type additional light distribution pattern obtained by computer simulation. Similarly, it is explanatory drawing which shows the special light distribution pattern of the state which synthesize | combined the light distribution pattern for passing obtained by the computer simulation shown in FIG. 6, and the diffusion type additional light distribution pattern obtained by the computer simulation shown in FIG. It is a front view of the lamp unit which shows Example 3 of the vehicle headlamp concerning this invention. Similarly, it is the XII-XII sectional view taken on the line in FIG. Similarly, it is the XIII-XIII sectional view taken on the line in FIG. It is a front view of the lamp unit which shows Example 4 of the vehicle headlamp concerning this invention. Similarly, it is the XV-XV sectional view taken on the line in FIG. It is Example 5 of the vehicle headlamp concerning this invention, and is explanatory drawing which shows the condensing type additional light distribution pattern and diffusion type additional light distribution pattern obtained by computer simulation. Similarly, the special light distribution in a state in which the light distribution pattern for passing obtained by the computer simulation shown in FIG. 6 and the condensing type additional light distribution pattern and the diffusion type additional light distribution pattern obtained by the computer simulation shown in FIG. It is explanatory drawing which shows a light pattern.

Explanation of symbols

1, 100, 101 Vehicle headlamp 2 Discharge lamp (light source)
DESCRIPTION OF SYMBOLS 3 Reflector 4 Projection lens 5 Shade 6 Frame 7 Socket 8 Light emission part 9 1st reflective surface 10 Through-hole 11 Opening part 12 Upper horizontal edge 13 Diagonal edge 14 Lower horizontal edge 15 Elbow point 16, 160 2nd reflective surface 17, 170 1st 3 Reflective surface 18, 180 Auxiliary reflector 19 Through-hole 20 Discharge lamp protective tube P Light distribution pattern for passing CL1 Lower horizontal cut-off line CL2 Oblique cut-off line CL3 Upper horizontal cut-off line E Elbow point HL-HR Horizontal line on the left and right VU- Vertical lines on the VD screen Z1-Z1 Optical axis of the first reflecting surface Z4-Z4 Optical axis of the projection lens F11 First focal point of the first reflecting surface F12 Second focal point of the first reflecting surface F21, F210 Second reflecting surface First focus F22, F220 second focus of the second reflecting surface F3, F 0 Focus of the third reflecting surface F4 Focus of the projection lens L1 Reflected light from the first reflecting surface not shielded by the shade L2 Reflected light from the first reflecting surface shielded by the shade L3 Reflected light from the second reflecting surface L4 Reflected light from the third reflecting surface forming the condensing type additional light distribution pattern L5 Reflected light from the third reflecting surface forming the diffusion type additional light distribution pattern L6 Reflected light from the second reflecting surface L7 Reflected light from the third reflecting surface forming the light type additional light distribution pattern L8 Reflected light from the third reflecting surface forming the diffusion type additional light distribution pattern F Front side B Rear side U Upper D Lower side L Left side R Right side

Claims (7)

In a projector type vehicle headlamp that irradiates the front of the vehicle with a light distribution pattern having a cut-off line,
A light source;
A reflector having a first reflecting surface for reflecting light from the light source;
A projection lens that projects the reflected light from the first reflecting surface forward;
A shade that shields a part of the reflected light from the first reflecting surface toward the projection lens to form a light distribution pattern having a cutoff line;
A second reflecting surface that reflects light blocked by the shade in a direction not blocked by the shade when reflected from the first reflecting surface among light from the light source;
A third reflecting surface for reflecting the reflected light from the second reflecting surface to the front of the vehicle as an additional light distribution pattern;
With
The second reflective surface is an elliptical reflective surface having a first focal point located at the light source and a second focal point located above and ahead of the light source,
The third reflecting surface is a reflecting surface having the second focal point of the second reflecting surface as a pseudo light source.
A vehicle headlamp characterized by that.   The said 3rd reflective surface reflects the reflected light from the said 2nd reflective surface in the said cutoff line vicinity of the said light distribution pattern as a condensing type additional light distribution pattern, It is characterized by the above-mentioned. Vehicle headlamp.   2. The vehicle according to claim 1, wherein the third reflecting surface reflects reflected light from the second reflecting surface as a diffusion-type additional light distribution pattern in the vicinity of the cut-off line of the light distribution pattern. For headlamps.   2. The vehicle headlamp according to claim 1, wherein the third reflecting surface is disposed inside the vehicle with respect to the light source, the reflector, the projection lens, and the shade.   2. The vehicle headlamp according to claim 1, wherein the third reflecting surface is disposed outside the vehicle with respect to the light source, the reflector, the projection lens, and the shade.   The vehicular headlamp according to any one of claims 1 to 5, wherein the second reflecting surface is provided on the reflector. The light source is a discharge lamp;
The second reflecting surface is provided in a zone that avoids a zone that is shaded by a protective tube of the discharge lamp and a zone that is colored by iodide in the discharge lamp.
The vehicular headlamp according to any one of claims 1 to 6, wherein

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