JP2005347148A - Vehicular headlamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance utilization efficiency of luminous flux of a light source, to simplify the structure of a lamp, and thereafter to properly control its irradiating light, in a vehicular headlamp for reflecting, toward the front side by a first reflector disposed on the lower side of the light source, light from the light source reflected by second reflectors installed on the upper side of the light source. <P>SOLUTION: The first reflector 24 is so structured as to reflect direct light from the light source 22a toward the front side as well, whereby utilization efficiency of the luminous flux of the light source is enhanced and the structure of the lamp is simplified. Then, a reflecting surface 24a of the reflector 24 is formed with a parabolic columnar surface using a horizontal axial line crossing a light axis Ax at right angles in the vicinity of the light source 22a as a focal line FL. Reflecting surfaces 26La and 26Ra of the second reflectors 26L and 26R are each formed with an ellipsoid of revolution using a point in the vicinity of the intersection of the focal line FL with the light axis Ax as a first focal point F1 and other points on the focal line FL as second focal points F2. Thereby, the irradiating light can properly be controlled. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle headlamp configured to perform light irradiation by combining a plurality of reflectors.

  In general, a vehicle headlamp is configured to reflect light from a light source disposed on an optical axis extending in the vehicle front-rear direction by a reflector.

  In this case, “Patent Document 1” describes a vehicle headlamp provided with first and second reflectors in addition to the basic reflector. In this vehicle headlamp, the basic reflector is provided on the lower side of the light source, the first reflector is provided on the outer peripheral side of the reflector, and the second reflector is provided on the upper side of the light source. Is provided. The direct reflector from the light source is reflected forward by the basic reflector, and the light from the light source reflected by the second reflector is reflected forward by the first reflector. .

JP 2001-312908 A

  If the lamp configuration as described in the above-mentioned “Patent Document 1” is adopted, the utilization efficiency of the light source luminous flux can be increased. In the vehicle headlamp described in this “Patent Document 1”, Since the first reflector that reflects the reflected light from the second reflector forward is provided separately from the basic reflector, there is a problem that the configuration of the lamp becomes complicated. is there.

  On the other hand, if the basic reflector and the first reflector are shared, it is possible to simplify the lamp configuration.

  However, in this case, since the direct reflected light from the light source and the reflected light from the second reflector are reflected by the common reflector, it is necessary to appropriately control the irradiation light. For this reason, there is a problem that the shape and arrangement of the light distribution pattern that can be formed by the reflected light from the common reflector is greatly restricted. That is, when a light distribution pattern formed by reflecting direct light from a light source is to be formed in a predetermined shape at a predetermined position, the light distribution formed by reflecting light from the light source reflected by the second reflector is reflected. There is a problem that the position and shape of the light pattern become inappropriate.

  This invention is made | formed in view of such a situation, Comprising: The light from the light source reflected by the 2nd reflector provided in the upper side of the light source is 1st arrange | positioned in the lower side of the light source In a vehicle headlamp configured to be reflected forward by a reflector, the efficiency of light source luminous flux can be increased and the lamp configuration can be simplified, and the irradiation light can be appropriately controlled. The purpose is to provide a headlamp.

  In the present invention, the object is achieved by devising the reflecting surface shapes of the first and second reflectors.

That is, the vehicle headlamp according to the present invention is
A light source disposed on an optical axis extending in the vehicle front-rear direction, a first reflector provided below the light source and reflecting light from the light source forward, and provided above the light source. A vehicle reflector comprising: a second reflector that reflects light from the light source toward the first reflector;
The first reflector has a substantially parabolic columnar reflecting surface having a horizontal axis substantially perpendicular to the optical axis in the vicinity of the light source as a focal line.
The second reflector has a substantially spheroidal surface having a point near the intersection of the focal line and the optical axis as a first focal point and a point on the focal line that is a predetermined distance away from the optical axis as a second focal point. It has the shape of a reflective surface.

  The light distribution pattern formed by light irradiation from the vehicle headlamp according to the present invention may be a low-beam light distribution pattern, a high-beam light distribution pattern, or any other distribution. It may be a light pattern.

  The type of the “light source” is not particularly limited. For example, a light emitting part of a discharge bulb, a filament of a halogen bulb, a light emitting element such as a light emitting diode or a laser diode, and the like can be employed.

  The above-mentioned “first reflector” has a substantially parabolic columnar reflecting surface whose focal line is a horizontal axis substantially orthogonal to the optical axis in the vicinity of the light source. The particular configuration is not particularly limited. In addition, the “first reflector” does not necessarily require that the entire area of the reflecting surface is formed below the light source, and a part of the area is formed above the light source. May be.

  The “second reflector” is a substantially spheroidal surface having a point near the intersection of the focal line and the optical axis as a first focal point and a point on the focal line at a predetermined distance from the optical axis as a second focal point. The specific configuration such as the size and the eccentricity is not particularly limited as long as it has a reflective surface. In addition, the “second reflector” does not necessarily require that the entire area of the reflecting surface be formed on the upper side of the light source, and a partial area thereof is formed on the lower side of the light source. May be.

  As shown in the above configuration, the vehicle headlamp according to the present invention is a first device that reflects light from the light source forward on the lower side of the light source disposed on the optical axis extending in the vehicle longitudinal direction. And a second reflector that reflects light from the light source toward the first reflector is provided above the light source, so that the light source luminous efficiency can be increased.

  In this case, the first reflector has a substantially parabolic columnar reflecting surface whose focal line is a horizontal axis substantially orthogonal to the optical axis in the vicinity of the light source, and the second reflector has the focal line as described above. Since a point near the intersection with the optical axis is a first focal point and a substantially spheroidal reflecting surface having a second focal point at a distance from the optical axis on the focal line, Such effects can be obtained.

  That is, the first reflector has a substantially parabolic columnar reflecting surface whose focal line is a horizontal axis that is substantially orthogonal to the optical axis in the vicinity of the light source. Can be reflected so as to diffuse in the left-right direction without being diffused. Further, since the second reflector has a substantially spheroidal reflecting surface, the reflected light from the reflector is once converged on the second focal point, and then the divergent light from the second focal point is obtained. However, since the second focal point is located on the focal line, the first reflector also reflects the reflected light from the second reflector in the vertical direction. Can be reflected so as to diffuse in the left-right direction without being diffused.

  In this way, the configuration of the lamp is simplified by reflecting the direct light from the light source and the reflected light from the second reflector toward the front by the common reflector called the first reflector. Can do. Moreover, since the reflected light can be appropriately controlled in spite of the use of the common reflector as described above, it is suitable for the light distribution pattern to be formed by the light irradiation from the vehicle headlamp. It is possible to easily form the light distribution pattern at a predetermined position.

  As described above, according to the present invention, the light from the light source reflected by the second reflector provided on the upper side of the light source is reflected forward by the first reflector disposed on the lower side of the light source. In the vehicular headlamp configured as described above, the use efficiency of the light source luminous flux can be improved and the lamp configuration can be simplified, and the irradiation light control can be appropriately performed.

  In the above configuration, the second reflector may be single. However, if a pair of the second reflectors is provided on both the left and right sides of the optical axis, the utilization efficiency of the light source luminous flux can be further improved, and the horizontally long distribution is provided. The light pattern can be formed with good left-right balance.

  In the above configuration, a predetermined gap is formed between the first reflector and the second reflector, and light directed from the light source to the side through the gap is emitted to the outer peripheral side of the first and second reflectors. If the third reflector that reflects the light toward the front is provided, it is possible to form a light distribution pattern having a property different from that of the light distribution pattern formed by the reflected light from the first reflector. At that time, the third reflector is provided on the outer peripheral side of the first and second reflectors, and is located relatively far from the light source. Therefore, the light distribution pattern formed by the reflected light from the reflector is changed. The light distribution pattern can be made brighter and smaller than the light distribution pattern formed by the reflected light from the first reflector, whereby the light distribution pattern to be formed by the light irradiation from the vehicle headlamp. A high luminous intensity region can be easily formed.

  Further, in the above configuration, if the light source is configured as a line segment light source extending along the optical axis, and the line segment light source is arranged so that its front end position is located on the focal line, the reflected light from the first reflector The light distribution pattern formed by the above can be a light distribution pattern having a high positional accuracy of the upper edge and a high light / dark ratio, thereby forming a light distribution pattern more suitable for forming a low beam light distribution pattern. be able to. Here, the “line segment light source” means a light source having a predetermined length, and does not necessarily extend linearly.

  In this case, if the position of the first focal point is set to a position displaced backward to the vicinity of the rear end position of the line light source with respect to the focal line, light is reflected by the reflected light from the second reflector. The light source image formed on the horizontal plane including the axis can be arranged such that the front edge thereof is located at the second focal point and the luminous intensity distribution is the highest in the vicinity of the front edge of the light source image. . Thus, the light distribution pattern formed by reflecting the reflected light from the second reflector with the first reflector is also a light distribution pattern with a high positional accuracy of the upper edge and a high contrast ratio. be able to.

  At this time, when the line segment light source is constituted by the light emitting part of the discharge bulb, the light emitting part has an upward curved shape, so that the positions of the first focal point and the second focal point are set to the focal line. On the other hand, it is preferable to set the position slightly displaced upward. In this case, the specific amount of upward displacement is preferably about 0.2 to 0.8 mm, more preferably about 0.4 to 0.6 mm.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side sectional view showing a vehicle headlamp 10 according to an embodiment of the present invention.

  As shown in the figure, this vehicle headlamp 10 is a light extending in the vehicle front-rear direction in a lamp chamber formed by a lamp body 12 and a transparent light-transmitting cover 14 attached to the front end opening. A lamp unit 20 having an axis Ax is accommodated so as to be tiltable in the vertical and horizontal directions via an aiming mechanism (not shown), and performs light irradiation for forming a low beam light distribution pattern.

  In the vehicular headlamp 10, when the aiming adjustment by the aiming mechanism is completed, the optical axis Ax of the lamp unit 20 is a downward direction of about 0.5 to 0.6 ° with respect to the vehicle longitudinal direction. It is designed to extend.

  2 and 3 are a plan sectional view and a front view showing the lamp unit 20 as a single product. 4 and 5 are detailed views of the main part of FIGS.

  As shown in these drawings, the lamp unit 20 includes a light source bulb 22, a first reflector 24, second reflectors 26 </ b> L and 26 </ b> R, and a third reflector 28.

  The light source bulb 22 is a discharge bulb such as a metal halide bulb whose light source generated by discharge is a light source 22a, and the light source 22a is configured as a line light source extending in the central axis direction of the bulb. The light source bulb 22 is inserted and fixed from the rear side with respect to the first and second reflectors 24 and 26 in a state where the light source 22a is arranged so as to extend along the optical axis Ax.

  The first reflector 24 is provided on the lower side of the light source 22a. The reflector 24 has a parabolic columnar reflecting surface 24a with a horizontal axis perpendicular to the optical axis Ax as a focal line FL at the front end position of the light source 22a. At this time, the reflecting surface 24a is formed such that the axis of the parabola that constitutes the vertical cross section thereof coincides with the direction of the optical axis Ax. As a result, the direct light from the light source 22a is reflected so as to be diffused in the horizontal direction without being diffused in the vertical direction.

  The first reflector 24 is formed in a horizontally long rectangular shape when viewed from the front, and the position of the upper edge of the first reflector 24 is set at the same height as the optical axis Ax. On the left and right sides of the reflecting surface 24a of the reflector 24, side reflecting surfaces 24b composed of vertical surfaces parallel to the optical axis Ax are formed. As a result, the direct light from the light source 22a and the reflected light from the reflection surface 24a incident on the side reflection surfaces 24b are specularly reflected in opposite directions, so that they can be effectively used as front irradiation light. It has become.

  A pair of second reflectors 26L, 26R is provided on both the left and right sides of the optical axis Ax above the light source 22a. The pair of reflectors 26 </ b> L and 26 </ b> R are integrally formed and are fixed to the first reflector 24.

  At this time, the second reflectors 26L and 26R are arranged in the same shape and symmetrical with respect to the optical axis Ax so as to reflect the light from the light source 22a toward the first reflector 24. It has become. Specifically, each of the reflectors 26L and 26R has a point near the intersection of the focal line FL and the optical axis Ax as the first focal point F1, and is equidistant from the optical axis Ax on the left and right sides on the focal line FL. It has spheroid reflecting surfaces 26La and 26Ra whose second focal point is F2. Then, the light from the light source 22a reflected by each of the reflecting surfaces 26La and 26Ra is once converged on the second focal point F2, and then incident on the first reflector 24 as divergent light from the second focal point F2. It has become.

  These second reflectors 26L and 26R are formed such that their lower end edges are located slightly below the optical axis Ax. In addition, rectangular notches 26Lb and 26Rb extending along the lower edge are formed at the left and right lower edges of the second reflectors 26L and 26R, whereby the first reflector 24 and the second reflector 24 A pair of left and right rectangular gaps are formed between the reflectors 26L and 26R. Further, at the central front end of these second reflectors 26L and 26R, there is formed a protrusion 26c that surrounds the optical axis Ax in a semi-cylindrical shape from the upper side and whose front end surface is closed in a circular shape. Thus, upward direct light directed forward from the light source 22a is shielded.

  The third reflector 28 is provided on the outer peripheral side of the first and second reflectors 24, 26L, and 26R, and the left and right 1 formed between the first reflector 24 and the second reflectors 26L and 26R. The light from the light source 22a directed to the side through the pair of gaps is reflected forward.

  The third reflector 28 has a reflecting surface 28a formed with a rotating paraboloid having the optical axis Ax as a central axis as a reference surface and a rear end position of the light source 22a on the optical axis Ax as a focal point. Yes. The reflection surface 28a is composed of a plurality of reflection elements 28s divided into vertical stripes, and diffuses and reflects light from the light source 22a in the horizontal direction. At this time, in the left reflective area 28La located on the left side of the optical axis Ax and the right reflective area 28Ra located on the right side on the reflective surface 28a, the horizontal diffusion angle and deflection angle of the reflected light from each reflective element 28s are different. Different values are set. Each reflective element 28s constituting the right reflective area 28Ra reflects light from the light source 22a slightly upward with respect to each reflective element 28s constituting the left reflective area 28La.

  As shown in FIG. 4, the spheroidal surface constituting the reflecting surface 26Ra of the second reflector 26R located on the right side has a position of the first focal point F1 and the second focal point F2 slightly with respect to the focal line FL. (For example, about 0.5 mm) is set to a position displaced upward, and the position of the first focal point F1 is set to a position displaced backward to the rear end position of the light source 22a with respect to the focal line FL. ing. In this respect, the same applies to the second reflector 26L located on the left side.

  By setting the positions of the first focal point F1 and the second focal point F2 in this way, as shown by the solid line and the broken line in FIG. 5, the reflected light from each reflector 26L, 26R is formed on the horizontal plane including the optical axis Ax. The light source image I is arranged such that its front edge is located at the second focal point F2, and its luminous intensity distribution is the highest in the vicinity of the front edge of the light source image I.

  FIG. 6 is a perspective view showing a low beam light distribution pattern formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by light irradiated forward from the vehicle headlamp 10.

  As shown in the figure, this low beam light distribution pattern PL is a left light distribution light beam distribution pattern, and has upper and lower cut-off lines CL1 and CL2 at its upper edge. The cut-off lines CL1 and CL2 extend in the horizontal direction at the left and right steps with the VV line passing through the HV, which is a vanishing point in the front direction of the lamp, in the vertical direction, and are on the right side of the VV line. The opposite lane side portion is formed as a lower cut-off line CL1, and the own lane side portion on the left side of the VV line is formed as an upper cut-off line CL2 that is stepped up with respect to the lower cut-off line CL1. Yes. In this low beam distribution pattern PL, the position of the elbow point E, which is the intersection of the lower cut-off line CL1 and the VV line, is set to a position about 0.5 to 0.6 ° below HV. A hot zone HZ that is a high luminous intensity region is formed so as to surround the elbow point E to the left.

  The low beam light distribution pattern PL is configured as a combined light distribution pattern of the light distribution pattern P1, the light distribution patterns P2A and P2B, and the light distribution patterns P3A and P3B.

  The light distribution patterns P1, P2A, and P2B are light distribution patterns formed by the reflected light from the first reflector 24.

  The light distribution pattern P1 is a light distribution pattern that is formed by reflecting direct light from the light source 22a, and is a horizontally long light distribution pattern that extends widely in the left-right direction around the VV line. At this time, the light distribution pattern P1 has an upper edge formed at a high brightness ratio at a height position substantially the same as the lower cut-off line CL1. This is because the focal line FL of the parabolic column surface constituting the reflection surface 24a of the first reflector 24 extends in the horizontal direction so as to be orthogonal to the optical axis Ax at the front end position of the light source 22a. is there.

  The light distribution pattern P2A is a light distribution pattern formed by reflecting the reflected light from the reflection surface 26La of the second reflector 26L located on the left side, and has a diffusion angle substantially the same as that of the light distribution pattern P1. It is a horizontally long light distribution pattern that expands in the left-right direction. The light distribution pattern P2A has a larger vertical width than the light distribution pattern P1, and includes a relatively large amount of light reflected by the left side reflecting surface 24b of the first reflector 24L. The diffusion angle in the direction is smaller than the diffusion angle in the right direction.

  On the other hand, the light distribution pattern P2B is a light distribution pattern formed by reflecting the reflected light from the reflection surface 26Ra of the second reflector 26R located on the right side. It is formed with a symmetrical positional relationship.

  Each of these light distribution patterns P2A and P2B is also formed with a high contrast ratio at the upper edge of the upper edge substantially the same height as the lower cut-off line CL1. This is because the front edge of the light source image I formed on the horizontal plane including the optical axis Ax by the reflected light from the reflectors 26L and 26R is located at the second focal point F2, and the luminous intensity of each of the light source images I. This is because the distribution has the highest luminous intensity in the vicinity of the front edge.

  The light distribution patterns P3A and P3B are light distribution patterns formed by the reflected light from the third reflector 28.

  At this time, the light distribution pattern P3A is a light distribution pattern formed by the reflected light from the left reflective region 28La on the reflective surface 28a of the third reflector 28. This light distribution pattern P3A has a left-side reflection region 28La at a position far away from the light source 22a in the left direction, so that the light distribution pattern P3A is brighter and smaller than the light distribution pattern P1 and straddles the VV line. The lower cut-off line CL1 is formed at the upper end edge.

  On the other hand, the light distribution pattern P3B is a light distribution pattern formed by the reflected light from the right reflective region 28Ra on the reflective surface 28a of the third reflector 28. This light distribution pattern P3B extends to the left from the VV line as a light distribution pattern that is brighter and smaller than the light distribution pattern P1 because the right reflection region 28Ra is located far from the light source 22a in the right direction. The upper cut-off line CL2 is formed at the upper end edge.

  The left and right diffusion angles and the formation positions of these light distribution patterns P3A and P3B are set by appropriately adjusting the surface shape of each reflecting element 28s constituting the reflecting surface 28a as described above. .

  As described above in detail, the vehicular headlamp 10 according to the present embodiment has the lamp unit 20 from the light source 22a to the lower side of the light source 22a disposed on the optical axis Ax extending in the vehicle front-rear direction. The first reflector 24 that reflects the light forward is provided, and the second reflectors 26L and 26R that reflect the light from the light source 22a toward the first reflector 24 are provided above the light source 22a. Therefore, the utilization efficiency of the light source luminous flux can be increased.

  At that time, the first reflector 24 has a parabolic columnar reflecting surface 24a in which the horizontal axis perpendicular to the optical axis Ax is a focal line FL in the vicinity of the light source 22a, and the second reflectors 26L and 26R. Is a spheroidal reflection having a point near the intersection of the focal line FL and the optical axis Ax as the first focal point F1, and a point on the focal line FL away from the optical axis Ax by a predetermined distance as the second focal point F2. Since the surfaces 26La and 26Ra are provided, the following operational effects can be obtained.

  That is, the first reflector 24 has a parabolic columnar reflecting surface 24a having a focal axis FL as a horizontal axis perpendicular to the optical axis Ax in the vicinity of the light source 22a. The light can be reflected so as to be diffused in the left-right direction without being diffused in the up-down direction, whereby a horizontally long light distribution pattern P1 can be formed. Further, since the second reflectors 26L and 26R have spheroidal reflection surfaces 26La and 26Ra, the reflected light from the reflectors 26L and 26R is once converged on the second focal point F2. The second reflector F2 can be incident on the first reflector 24 as divergent light from the second focus F2, but since the second focus F2 is located on the focal line FL, the first reflector 24 The reflected light from the reflectors 26L and 26R can also be reflected so as to be diffused in the horizontal direction without being diffused in the vertical direction, thereby forming the horizontally long light distribution patterns P2A and P2B. it can.

  In this way, the direct light from the light source 22a and the reflected light from the second reflectors 26L and 26R are reflected forward by the common reflector called the first reflector 24, so that Simplification can be achieved. Moreover, since the reflected light can be appropriately controlled in spite of using the common reflector as described above, the horizontally long light distribution patterns P1, P2A, and P2B suitable for the low beam light distribution pattern PL are set as predetermined. It can be easily formed at the position.

  As described above, according to the present embodiment, the light from the light source 22a reflected by the second reflectors 26L and 26R provided on the upper side of the light source 22a is the first reflector 24 disposed on the lower side of the light source 22a. In the vehicular headlamp 10 configured to reflect the light forward, the use efficiency of the light source luminous flux can be improved and the lamp configuration can be simplified, and the irradiation light control can be appropriately performed.

  In particular, in the present embodiment, since a pair of second reflectors 26L and 26R are provided on both the left and right sides of the optical axis Ax, the utilization efficiency of the light source luminous flux can be further improved, and the horizontally long light distribution pattern P2A. , P2B can be formed with good left-right balance.

  In the present embodiment, a predetermined gap is formed between the first reflector 24 and the second reflectors 26L, 26R. On the outer peripheral side of the first and second reflectors 24, 26L, 26R. Is provided with the third reflector 28 that reflects the light directed from the light source 22a to the side through the gap toward the front, so that the light distribution pattern P1 formed by the reflected light from the first reflector 24, Light distribution patterns P3A and P3B having different properties from P2A and P2B can be formed. At this time, the third reflector 28 is provided on the outer peripheral side of the first and second reflectors 24, 26L, and 26R, and is located relatively far from the light source 22a. Therefore, the reflected light from the reflector 28 is provided. The light distribution patterns P3A, P3B formed by the above can be made lighter and smaller than the light distribution patterns P1, P2A, P2B formed by the reflected light from the first reflector 24, and thus the low beam It is possible to easily form the hot zone HZ and the cut-off lines CL1, CL2 in the light distribution pattern PL.

  Furthermore, in the present embodiment, the light source 22a is configured as a line segment light source extending along the optical axis Ax, and the front end position thereof is located on the focal line FL. The light distribution pattern P1 formed by reflecting light by the first reflector 24 can be a light distribution pattern having a high positional accuracy of the upper edge and a high light / dark ratio. Therefore, the light distribution pattern P1 can be formed such that the upper end edge thereof is positioned in the vicinity of the lower cut-off line CL1, thereby making the light distribution pattern more suitable for forming the low beam light distribution pattern PL. .

  In addition, in the present embodiment, the position of the first focal point F1 is set to a position displaced backward to the rear end position of the light source 22a with respect to the focal line FL, so that the reflection from the second reflectors 26L and 26R. The light source image I formed on the horizontal plane including the optical axis Ax by light has its front edge located at the second focal point FL, and its luminous intensity distribution is the highest in the vicinity of the front edge of the light source image I. Can be. Therefore, also for the light distribution patterns P2A and P2B formed by reflecting the reflected light from the second reflectors 26L and 26R by the first reflector 24, the positional accuracy of the upper edge is high and the contrast ratio is high. It can be a light distribution pattern. Therefore, these light distribution patterns P2A and P2B can also be formed so that the upper edge thereof is positioned in the vicinity of the lower cut-off line CL1, thereby making the light distribution pattern more suitable for forming the low beam light distribution pattern PL. be able to.

  At this time, in the present embodiment, the positions of the first focal point F1 and the second focal point F2 are set to positions slightly displaced upward with respect to the focal line FL, so that the light source 22a as a line segment light source is provided. The light source image I is composed of the light emitting part of the discharge bulb and is curved upward. The front edge of the light source image I is located at the second focal point FL, and the light intensity distribution is the light source image. It is possible to have the highest luminous intensity in the vicinity of the front edge of I.

  By the way, in the said embodiment, although the vehicle headlamp 10 demonstrated as what was comprised as a lamp | ramp which performs the light irradiation for forming the light distribution pattern for low beams, this was formed as the light distribution pattern for high beams. It is also possible to configure as a lamp that performs light irradiation for the purpose. In this case, the directions of the first and second reflectors 24, 26L, and 26R are appropriately adjusted to displace the light distribution patterns P1, P2A, and P2B slightly upward, and the direction of the third reflector 28 is appropriately adjusted. The light distribution patterns P3A and P3B may be displaced closer to HV by adjustment.

  Further, the vehicle headlamp 10 according to the above-described embodiment has been described on the assumption that the lamp unit 20 includes the third reflector 28 in addition to the first and second reflectors 24, 26L, and 26R. However, a configuration including only the first and second reflectors 24, 26L, and 26R is also possible. In such a case, the low beam light distribution pattern PL or the high beam light distribution pattern can be formed in combination with another lamp unit. In this case, when a light emitting diode or the like is used as the light source, the required amount of light can be easily ensured by using a plurality of lamp units including the first and second reflectors 24, 26L, and 26R. It becomes possible.

Side sectional view which shows the vehicle headlamp which concerns on one Embodiment of this invention Flat sectional view showing the lamp unit of the vehicle headlamp as a single item Front view showing the lamp unit as a single item Detailed view of the main part of FIG. Detailed view of the main part of FIG. The figure which shows transparently the light distribution pattern for low beams formed on the virtual vertical screen arrange | positioned in the position of the lamp front 25m with the light irradiated ahead from the said vehicle headlamp

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle headlamp 12 Lamp body 14 Translucent cover 20 Lamp unit 22 Light source bulb 22a Light source 24 1st reflector 24a Reflective surface 24b Side reflective surface 26L, 26R Second reflector 26La, 26Ra Reflective surface 26Lb, 26Rb Cut off Notch portion 26c Projection portion 28 Third reflector 28a Reflecting surface 28aL Left reflecting region 28aR Right reflecting region 28s Reflecting element Ax Optical axis CL1 Lower cut-off line CL2 Upper cut-off line E Elbow point F1 First focus F2 Second focus FL Focus line HZ Hot zone I Light source image PL Low beam light distribution pattern P1, P2A, P2B, P3A, P3B Light distribution pattern

Claims (6)

A light source disposed on an optical axis extending in the vehicle front-rear direction, a first reflector provided below the light source and reflecting light from the light source forward, and provided above the light source. A vehicle reflector comprising: a second reflector that reflects light from the light source toward the first reflector;
The first reflector has a substantially parabolic columnar reflecting surface having a horizontal axis substantially perpendicular to the optical axis in the vicinity of the light source as a focal line.
The second reflector has a substantially spheroidal surface having a point near the intersection of the focal line and the optical axis as a first focal point and a point on the focal line that is a predetermined distance away from the optical axis as a second focal point. A vehicular headlamp characterized by having a reflective surface.   The vehicular headlamp according to claim 1, wherein a pair of the second reflectors are provided on both the left and right sides of the optical axis. A predetermined gap is formed between the first reflector and the second reflector;
The third reflector for reflecting the light directed from the light source toward the side through the gap toward the front is provided on the outer peripheral side of the first and second reflectors. The vehicle headlamp according to 2. The light source is configured as a line light source extending along the optical axis;
The vehicle headlamp according to any one of claims 1 to 3, wherein the line segment light source is disposed so that a front end position of the line segment light source is positioned on the focal line.   5. The vehicle headlamp according to claim 4, wherein the position of the first focal point is set to a position displaced backward to the vicinity of a rear end position of the line segment light source with respect to the focal line. . The line segment light source is composed of a light emitting part of a discharge bulb,
6. The vehicular headlamp according to claim 5, wherein the positions of the first focus and the second focus are set to positions displaced slightly upward with respect to the focal line.

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