JP2018045896A - Vehicular headlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular headlight capable of suppressing increase in size, while adjusting distribution of light radiated above a low beam.SOLUTION: A vehicular headlight 1 includes: a first light source 41 for emitting light which becomes a low beam; a second light source 42 for emitting light which becomes light radiated above the low beam; and a light guide member 50 having a first incident surface 51 in which light emitted from the first light source 41 enters, a concave internal reflection surface 52 for internally reflecting the light entering from the first incident surface 51, and an emission surface 54 from which the light internally reflected by the internal reflection surface 52 emits. An outside surface of the internal reflection surface 52 in the light guide member 50 serves as a second incident surface 53 in which the light emitted from the second light source 42 enters, and the light entering from the second incident surface 53 emits from the emission surface 54.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicular headlamp, and more particularly to a vehicular headlamp that can suppress an increase in size while adjusting the light distribution of a high beam, a daytime running lamp, or the like.

  In addition to a low beam light source for illuminating the front at night, a vehicular headlamp represented by an automobile headlight, a high beam light source for illuminating far away from the low beam, and the presence of vehicles in the daytime. It is known to have a daytime running lamp (DRL) or the like for showing. The light from the high beam or the daytime running lamp includes light that is irradiated upward from the low beam. Therefore, the high beam illuminates farther than the low beam as described above, and the light from the daytime running lamp can be viewed from a position higher than the low beam.

  Patent Document 1 below describes a vehicle headlamp having a low beam and a daytime running lamp. The vehicle headlamp disclosed in Patent Document 1 is provided with a light source unit for night illumination such as a low beam and a light source unit for daytime running lamp, that is, daytime illumination, in one lamp chamber. Yes.

JP 2014-165150 A

  In the vehicle lamp of Patent Document 1, the light source unit for night illumination and the light source unit for daytime illumination are provided in the lamp chamber as described above, and thus the light emitted from each unit can be controlled for each unit. The vehicle lamp tends to increase in size as a whole.

  Therefore, an object of the present invention is to provide a vehicular headlamp that can suppress an increase in size while adjusting the light distribution of light irradiated above the low beam.

  In order to achieve the above object, a vehicle headlamp according to the present invention includes a first light source that emits light that becomes a low beam, a second light source that emits light that is emitted above the low beam, and A first incident surface on which light emitted from the first light source is incident; a concave internal reflection surface that internally reflects light incident from the first incident surface; and an output from which light internally reflected by the internal reflection surface is emitted. A light guide member having a surface, wherein an outer surface of the internal reflection surface of the light guide member is a second incident surface on which light emitted from the second light source is incident, and is incident from the second incident surface. The light is emitted from the emission surface.

  According to such a vehicle headlamp, the light distribution of the low beam is adjusted by having the concave internal reflection surface that reflects the first light emitted from the first light source and incident from the first incident surface. be able to. Further, the outer surface of the concave internal reflection surface is convex, and the convex outer surface is used as a second incident surface on which the second light emitted from the two light sources is incident, so that it irradiates above the low beam. The light distribution of the emitted light can be adjusted. Thus, the region of the internal reflection surface that adjusts the first light from the first light source by internal reflection and the region of the second incident surface that adjusts the second light from the second light source by refracting are adjusted. Compared with the case where the part for adjusting the optical path of the first light from the first light source and the part for adjusting the optical path of the second light from the second light source are provided individually by overlapping, the vehicle headlamp Can be miniaturized. Note that the second light emitted from the second light source is, for example, a high beam or daytime illumination light that is emitted from the emission surface of the light guide member and illuminates the upper side of the low beam. A part of this light may overlap with the low beam.

  The second light emitted from the second light source preferably has a small divergence angle at the second incident surface.

  By adjusting the second light from the second light source in this way, it is possible to appropriately adjust the range of light irradiated upward from the low beam.

  Further, it is preferable that the second light source switches and emits the second light that becomes a high beam and the second light that becomes daytime illumination.

  In this case, the second light source can serve as both a high beam light source and a daytime light source. In general, the total luminous flux of the second light emitted from the second light source is larger in the state of being used as a high beam light source than in the state of being used as a light source for daytime illumination.

  A shielding member that shields at least a part of light other than light incident on the light guide member from the first incident surface and reflected by the internal reflection surface out of the first light emitted from the first light source; It is preferable to be provided.

  By providing such a shielding member, it is possible to prevent the first light, which is an unintentional light distribution whose optical path is not adjusted by the internal reflection surface, from being emitted to the outside.

  In this case, it is preferable that the shielding member is provided between the first light source and the first incident surface.

  By providing the shielding member in this manner, the optical unit including the first light source, the light guide member, and the shielding member can be downsized compared to the case where the shielding member is provided outside the first light source and the first incident surface. This can reduce the size of the vehicle headlamp.

  In this case, it is preferable that the shielding member is provided on a partial region of the first incident surface.

  By configuring the shielding member in this way, the shielding member can be formed in a film shape, and the structure can be simplified as compared with the case where a self-supporting shielding member is provided.

  Further, the shielding member is a reflecting member that reflects the first light from the first light source, and at least a part of the first light reflected by the reflecting member is incident on the light guide member and the inside It is preferable that the light is reflected from the reflection surface and emitted from the emission surface.

  The first light emitted from the first light source can be efficiently used by reflecting the first light incident on the shielding member and emitting it from the emission surface.

  In this case, it is preferable that at least a part of the first light reflected by the reflecting member enters the light guide member from the first incident surface.

  Since the first incident surface is a surface on which the first light from the first light source is incident, the first light incident on the reflecting member is incident on the incident surface so that the position of the first light source and the reflecting member is increased. According to the relationship, it is possible to control the light distribution of the light reflected from the internal reflection surface and emitted from the emission surface. Therefore, the light distribution of the first light reflected by the reflecting member can be easily adjusted.

  Further, at least a part of the first light reflected by the reflecting member, incident on the light guide member and reflected by the internal reflecting surface is irradiated above the low beam after being emitted from the emitting surface. It is preferable.

  Normally, the upper end of the light distribution pattern of the low beam is a cut line, and irradiating above the low beam means irradiating above the cut line. Since the light reflected by the reflecting member has such a light distribution, light for visually recognizing the sign can be emitted in a state where the low beam is irradiated at night. A part of this light may overlap with the low beam.

  As described above, according to the present invention, it is possible to provide a vehicular headlamp that can realize downsizing while adjusting the light distribution of light irradiated above the low beam.

It is a front view showing an outline of a vehicle provided with a vehicle headlamp in the first embodiment of the present invention. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. It is a figure which shows light distribution. It is sectional drawing which shows the outline of the vehicle headlamp in 2nd Embodiment of this invention from the same viewpoint as FIG. It is sectional drawing which shows the outline of the vehicle headlamp in 3rd Embodiment of this invention from the same viewpoint as FIG.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the vehicle headlamp which concerns on this invention is illustrated with an accompanying drawing. The embodiments exemplified below are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved from the following embodiments without departing from the spirit of the present invention.

(First embodiment)
First, the structure of the lamp of this embodiment is demonstrated.

  FIG. 1 is a front view showing an outline of a vehicle provided with a vehicle headlamp in the present embodiment. As shown in FIG. 1, the vehicle 100 includes a pair of vehicle headlamps 1 in each of the front left and right directions. The pair of vehicular headlamps 1 provided in the vehicle 100 are symmetrical to each other in the left-right direction. In the vehicle headlamp 1 of the present embodiment, a plurality of lamps 1 a, 1 b, and 1 c are arranged side by side, the lamp 1 a is disposed on the outermost side of the vehicle 100, and the lamp 1 c is the most central side of the vehicle 100. The lamp 1b is disposed between the lamp 1a and the lamp 1c. The respective lamps 1a, 1b, and 1c may have the same configuration or different configurations.

  2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. As shown in FIGS. 2 and 3, the lamp 1 a which is a part of the vehicle headlamp 1 includes a housing 10 and a lamp unit LU accommodated in the housing 10.

<Case 10>
The housing 10 includes a lamp housing 11, a front cover 12, and a back cover 13 as main components. The front of the lamp housing 11 is open, and the front cover 12 is fixed to the lamp housing 11 so as to close the opening. In addition, an opening smaller than the front is formed at the rear of the lamp housing 11, and the back cover 13 is fixed to the lamp housing 11 so as to close the opening.

  A space formed by the lamp housing 11, the front cover 12 that closes the front opening of the lamp housing 11, and the back cover 13 that closes the rear opening of the lamp housing 11 is a lamp chamber LR. A lamp unit LU is accommodated therein.

<Lamp unit LU>
The lamp unit LU includes a support member 30, a first light source 41, a second light source 42, a light guide member 50, and a reflecting member 60 as main components.

  The support member 30 is a metal member, and includes a top plate 31, a back plate 32, and a locking portion 33. The top plate 31 is a plate-like metal member extending substantially horizontally, and the back plate 32 is a plate-like metal member extending substantially vertically. The rear end of the top plate 31 and the upper end of the back plate 32 are connected to each other. Further, a locking portion 33 is connected near the upper end of the back plate 32. The locking portion 33 extends rearward from the back plate 32, and the locking portion 33 is formed with a screw hole that opens to the rear side. A screw 22 is screwed into the screw hole from the outside of the lamp housing 11, and a locking portion 33 is fixed to the lamp housing 11. A screw hole is also formed on the lower side of the back plate 32, and a screw 23 is screwed into the screw hole from the outside of the lamp housing 11, and the back plate 32 is fixed to the lamp housing 11. Thus, the back plate 32 is fixed in the lamp chamber LR in a substantially vertical state, and the top plate 31 connected to the back plate 32 is also fixed in the lamp chamber LR. In addition, by adjusting these screws 22 and 23, the angle of the back plate 32 can be finely adjusted, and accordingly, the angle of the top plate 31 can be finely adjusted.

  A first light source 41 that emits first light is disposed on the lower surface of the top plate 31. The first light source 41 is, for example, an LED (Light Emitting Diode). The first light source 41 is connected to a circuit board (not shown), and can emit the first light by power feeding from the circuit board.

  A second light source 42 is disposed on the front surface of the back plate 32. In the present embodiment, the second light source 42 has two emission areas that emit light. As will be described later, one emission area is used as an emission area for high beams, and the other emission area is daytime illumination. It is set as the emission area for the purpose. However, for example, the high beam emission region may include a daytime illumination emission region. Similarly to the first light source 41, the second light source 42 is connected to a circuit board (not shown), and can emit the second light by feeding from the circuit board. A reflective plate 45 is disposed at a position surrounding the second light source 42 of the back plate 32. The reflection plate 45 has a shape that spreads radially toward the front, and can reflect the second light emitted from the second light source 42 forward.

A light guide member 50 is disposed on the lower surface of the top plate 31 so as to surround the first light source 41. The light guide member 50 is cut out in a dome shape so that the top surface 55 surrounds the first light source 41, and the dome-shaped surface surrounding the first light source 41 emits the first light L emitted from the first light source 41. The first incident surface 51 on which ₁ is incident.

The back surface of the light guide member 50 in the light guide member 50 has a concave shape, and reflects the _first light L ₁ emitted from the first light source 41 and entering the light guide member 50 from the first incident surface 51 forward. It is formed to do. Therefore, the back surface of the light guide member 50 in the light guide member 50 is an internal reflection surface 52. The internal reflection surface 52 preferably totally internally reflects the _first light L1. The internal reflection surface 52 has a concave shape composed of a free-form surface based on a parabola that opens toward the front side. More specifically, the shape of the internal reflection surface 52 in the vertical cross section is a shape below the apex when the central axis of the parabola is horizontal. Further, the shape of the internal reflection surface 52 in the horizontal cross section is a shape including the apex of a parabola, as shown in FIG. However, the parabola in the cross section in the vertical direction of the internal reflection surface 52 and the parabola in the cross section in the horizontal direction may be different from each other. In addition, the shape in the horizontal cross section of the internal reflection surface 52 may not be a shape based on a parabola, for example, a shape based on a part of an ellipse or another concave shape. .

Further, the region that is the internal reflection surface 52 of the light guide member 50 is a position that overlaps the second light source 42 when the light guide member 50 is viewed from the front cover 12 side. Accordingly, the second light L ₂ emitted from the second light source 42 enters the light guide member 50 from a region overlapping the internal reflection surface 52 of the light guide member 50. Thus, the outer surface of the internal reflection surface 52 of the light guide member 50 is a second incident surface 53 of the second light L ₂ emitted from the second light source 42 is incident is reflected by the direct or the reflective plate 45. The second incident surface 53 has a convex shape because the internal reflection surface 52 is concave. Since the second incident surface 53 is convex, refractive as the second light L ₂ emitted from the second light source 42 when entering the light guide member 50 from the second incident surface 53, the divergence angle is reduced To do.

In the present embodiment, the front surface of the light guide member 50 has a convex shape. The front is the first of the second emission surface 54 that emits light L ₂ incident from the light L ₁ and the second incident surface 53 to the light guide member 50 which is reflected by the inner reflective surface 52.

The light guide member 50 is not particularly limited as long as it transmits light, but is made of a resin such as acrylic or polycarbonate, or glass. The light guide member 50 is made of silica glass to which a dopant for increasing the refractive index, such as germanium, is added from the viewpoint of a high refractive index so that the first light L ₁ is easily reflected by the internal reflection surface 52. Preferably, it is preferably made of a resin from the viewpoint of weight reduction.

In the present embodiment, the reflection member 60 that reflects a part of the first light is provided on the front side of the first incident surface 51 of the light guide member 50. The reflecting member 60 is incident on the light guide member 50 from the first incident surface 51 as described above, out of the first light L ₁ emitted from the first light source 41 when the reflecting member 60 is not provided. Thus, it is provided at a position where at least a part of light other than the light reflected by the internal reflection surface 52 is shielded. Therefore, the reflecting member 60 can also be understood as a shielding member that shields part of the first light. In this embodiment, the reflection member 60 that also serves as a shielding member is provided on a partial region of the first incident surface 51 between the first light source 41 and the first incident surface 51. It is formed in front of the emission part of the light source 41. In this case, when the reflecting member 60 is not provided, the reflecting member 60 shields and reflects light propagating directly from the first incident surface 51 toward the emitting surface 54.

Here, when the first light reflected by the reflecting member 60 of the light L ₁ emitted from the first light source 41 and reflected light L _1R, in the present embodiment, the reflected light L _1R, after reflected by the reflecting member 60 The light enters the light guide member 50 from the first incident surface 51 and is reflected by the internal reflection surface 52.

  Examples of the reflecting member 60 include a reflecting film in which a laminated body of a metal such as aluminum or a metal oxide is provided on the first incident surface 51, or a member in which a separately prepared reflector is disposed on the first incident surface 51. be able to.

As described above, the reflecting member 60 that also serves as a shielding member is incident on the light guide member 50 from the first light incident surface 51 directly from the first light source 41 in the first light L ₁ and is reflected by the internal reflecting surface 52. What is necessary is just to shield and reflect at least a part of the light other than the reflected light. Therefore, the reflecting member 60 may not reflect all the light, and may be a half mirror, for example.

  Next, operation | movement of the vehicle headlamp 1 is demonstrated using the lamp | ramp 1a. 4A and 4B are diagrams showing the light distribution. FIG. 4A shows the light distribution of the low beam, FIG. 4B shows the light distribution of the high beam, and FIG. 4C shows the light distribution of the daytime illumination. Show.

<When the low beam is on>
The low beam is irradiated with light from the first light source 41. As shown in FIGS. 2 and 3, most of the first light L ₁ emitted from the first light source 41 propagates directly from the first light source 41 to the first incident surface 51 and is guided from the first incident surface 51. The light enters the member 50. The first light L ₁ propagates through the light guide member 50 and is internally reflected by the internal reflection surface 52. Note that the first light L ₁ is preferably totally reflected by the internal reflection surface 52. The first light L ₁ reflected inside the light propagates forward in the light guide member 50 and is emitted from the emission surface 54. In the operation of irradiating the low beam, the light emitted from the foremost region in the emission portion of the first light source 41 among the first light L ₁ is subjected to a low beam cut line as shown in FIG. Form. In addition, light emitted from the same region in the emission part of the first light source 41 is converted into parallel light after internal reflection regardless of which part of the internal reflection surface 52 is internally reflected.

As shown in FIGS. 2 and 3, part of the first light L ₁ emitted from the first light source 41 propagates to the reflecting member 60 and is reflected by the reflecting member 60. The reflected light is incident on the light guide member 50 from the first incident surface 51 as reflected light L _1R. The reflected light L _1R propagates through the light guide member 50 and is internally reflected by the internal reflection surface 52. The reflected light L _1R is preferably totally reflected by the internal reflection surface 52. The internally reflected reflected light L _{1 R} propagates forward in the light guide member 50 and exits from the exit surface 54. At this time, at least a part of the reflected light L _1R is incident directly on the first incident surface 51 from the first light source 41 after being emitted from the emission surface 54, reflected by the internal reflection surface 52, and emitted from the emission surface 54. Irradiated above the light. That is, at least a part of the reflected light L _{1 R} is irradiated above the low beam cut line after emission from the emission surface 54. This light is weaker than the low beam, that is, light with a small luminous flux per unit area of the surface to be irradiated, and light for visually recognizing a sign when the low beam is turned on (OHS: Over Head Sign light) ). In order to form such a light distribution, the reflecting member 60 may be formed in front of the emitting part of the first light source 41 as described above, for example. In FIG. 4 (A), the reflected light L _1R emitted upward from the cut line to avoid becoming complicated it is not described.

<When the high beam is on>
In the present embodiment, at the time of high beam lighting, in addition to the operation at the time of low beam lighting, the second light L ₂ is emitted from the high beam emission region of the second light source 42. Figure 2, as shown in FIG. 3, the second light L ₂ emitted from the second light source 42 is incident from the second incident surface 53 is reflected by the direct or the reflective plate 45 to the light guide member 50. At this time, the second light L ₂ is refracted at the second incident surface 53 so that the divergence angle of the second light L ₂ becomes small. The second light L ₂ incident from the second incident surface 53 propagates through the light guide member 50 and is emitted from the emission surface 54. At least a portion of the second light L ₂ is irradiated above the low beam cut line after emission from the emission surface 54. Thus, a high beam light distribution shown in FIG. 4B is formed. In the above description, light is emitted from the first light source 41 and the second light source 42 when the high beam is lit. However, light is emitted only from the second light source 42 when the high beam is lit, and the arrangement shown in FIG. Light may be formed.

<During daytime lighting>
In the present embodiment, at the time of the daytime lighting lighting, without emitting light from the first light source 41, it is emitted from the emission region of the daytime illumination of the second light L ₂ of the second light source 42. However, the second light source 42 is dimmed when the daytime lighting is on than when the high beam is on. That, also emits a second light L ₂ less total luminous flux than the number of high beam lights from the second light source 42. Thus, in the present embodiment, the second light source 42 emits by switching the total luminous flux number together a second light L ₂ serving as the second light L ₂ and the light of day lighting as a high beam structure It is said. Second light L ₂ emitted from the second light source 42 in the DRL is lit, and propagates in the substantially same manner as when the high beam lights, emitted from the emitting surface 54. Thus, a light distribution during daytime illumination is formed as shown in FIG.

As described above, according to the vehicle headlamp 1 including lamp 1a of the present embodiment, the inner reflective surface 52 such as by adjusting the first optical path of the light L _1, to adjust the light distribution of the low beam be able to. In addition, the convex second incident surface 53 or the like can adjust the light distribution of the high beam or the daytime illumination light that is irradiated above the low beam. In this way, the region of the internal reflection surface 52 that adjusts the first light L ₁ from the first light source 41 by internal reflection, and the second light L ₂ that is refracted and adjusted by the second light L ₂ from the second light source 42. By overlapping the areas of the incident surfaces 53 with each other, it is possible to reduce the size of the vehicle headlamp as compared with the case where the areas are individually provided.

The second light L ₂ emitted from the second light source 42, since the divergence angle is small in the second incident surface 53, it is possible to appropriately adjust the range of light irradiated above the low beam .

  Further, as in the present embodiment, the second light source 42 switches the light that becomes the high beam and the light that becomes the daytime illumination, and emits the light that emits the light that becomes the high beam and the light that becomes the daytime illumination. There is no need to separately provide the light source to be emitted, and the vehicle headlamp 1 can be further downsized.

Further, in the present embodiment, since the reflecting member 60 that also serves as a shielding member is provided on a partial region of the first incident surface 51, when the reflecting member 60 is not provided, it is reflected by the internal reflecting surface 52. It is possible to block light that becomes an unintended light distribution without being emitted and to prevent the light from being emitted to the outside. In addition, in the present embodiment, the reflected light L _1R reflected by the reflecting member 60 is reflected by the internal reflection surface 52 and emitted from the emission surface 54, so that the first light L ₁ emitted from the first light source 41 is efficiently used. Can be used.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or equivalent, except the case where it demonstrates especially, the same referential mark is attached | subjected and the overlapping description is abbreviate | omitted.

FIG. 5 is a cross-sectional view schematically showing the vehicle headlamp in the present embodiment from the same viewpoint as FIG. In the vehicle headlamp of the present embodiment, a lamp 2a is used instead of the lamp 1a of the first embodiment. The lamp 2a is different from the lamp 1a of the first embodiment in that a reflecting member 61 is provided instead of the reflecting member 60 in the first embodiment, and the reflecting member 61 is provided on the emission surface 54 of the light guide member 50. The reflecting member 61 of the present embodiment is internally reflected when the reflecting member 61 is not included in the first light L ₁ emitted from the first light source 41 and entering the light guide member 50 from the first incident surface 51. Light that is not reflected by the surface 52 is reflected. As the reflecting member 61, for example, a reflecting film in which a laminated body of a metal such as aluminum or a metal oxide is provided on the first incident surface 51, or a separately prepared reflector is disposed on the first incident surface 51. Can be mentioned.

In the lamp 2a of the present embodiment, when light is emitted from the first light source 41 during low beam lighting or high beam lighting, a part of the light incident on the light guide member 50 from the first incident surface 51 is reflected by the reflecting member 61. The The reflected light L _1R reflected by the reflecting member 61 propagates rearward through the light guide member 50 and is reflected by the internal reflecting surface 52. Then, the reflected light L _1R reflected by the internal reflection surface 52 is emitted from the emission surface 54 and irradiated above the cut line of the low beam in the same manner as the reflected light L _1R in the first embodiment.

In the lamp 2a of this embodiment, even if it is difficult to arrange a reflecting member that also serves as a shielding member between the first light source 41 and the first incident surface 51, a reflecting member 61 that also serves as a shielding member is disposed. By doing so, it is possible to suppress the emission of unintended light distribution, and it is possible to efficiently utilize the first light L ₁ emitted from the first light source 41 by the reflected light L _1R . .

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or equivalent, except the case where it demonstrates especially, the same referential mark is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 6 is a cross-sectional view schematically showing the vehicle headlamp in the present embodiment from the same viewpoint as FIG. In the vehicle headlamp of the present embodiment, a lamp 3a is used instead of the lamp 1a of the first embodiment. The lamp 3a is different from the lamp 1a of the first embodiment in that a second light source that emits light for high beam and a second light source that emits light for daytime illumination are provided separately.

The second light source 42 of this embodiment is the second light L ₂ for high beam is emitted, in that it does not emit the second light L ₂ daytime lighting, different from the second light source of the first embodiment. The lamp 3a has a light pipe 72, which serves as a second light source for daytime illumination. Therefore, the light pipe 72 emits the second light L _{2 ′} for daytime illumination.

The lamp 3a is a plate-like member and has a bezel 34 that extends substantially horizontally. In the present embodiment, the bezel 34 is integrated with the support member 30 and extends forward from below the back plate 32. An opening 35 is formed in the bezel 34 in a region connecting the light pipe 72 and the second incident surface 53. Accordingly, the second light L _{2 ′} emitted from the light pipe 72 can propagate from the opening 35 to the second incident surface 53.

In the present embodiment, a plate-like second light guide member 73 that is disposed in front of the light pipe 72 and extends forward is provided. Part of the second light L _{2 ′} emitted from the light pipe 72 is incident on the second light guide member 73, and the second light guide member 73 receives the second light from the end surface opposite to the light pipe side. L _{2 ′} is emitted.

Further, an inner lens 74 is provided in front of the second light guide member 73. The inner lens 74 has a shape covering at least the front end surface of the second light guide member 73. Accordingly, the second light L _{2 ′} that enters the second light guide member 73 from the light pipe 72 and exits from the front end surface of the second light guide member 73 is refracted by the inner lens 74, and the inner lens 74 Exits from.

Lamp 3a having such a configuration, when the low beam irradiation, to the first light source in the same manner as in the first embodiment emits the first light L _1. Also, during the high beam irradiation, it emits a second light L ₂ from the second light source in the same manner as in the first embodiment.

In addition, light is emitted from the light pipe 72 during daytime illumination. Part of the second light L _{2 ′} emitted from the light pipe 72 propagates from the opening 35 to the second incident surface 53 of the light guide member 50, refracts at the second incident surface 53, and enters the light guide member 50. To do. At this time, the second light L _{2 ′} is refracted so that the divergence angle becomes small. A part of the _second light L _{2 ′} incident on the light guide member 50 is internally reflected by the emission surface 54. Note that the second light L _{2 ′} is preferably totally reflected by the emission surface 54. The second light L _{2 ′} internally reflected by the emission surface 54 is reflected by the top surface 55 of the light guide member 50. Therefore, in this embodiment, it is preferable that the top plate 31 with which the top surface 55 of the light guide member 50 contacts is mirror-finished. Further, the other part of the second light L _{2 ′} incident on the light guide member 50 is internally reflected by the first incident surface 51. Note that the second light L _{2 ′} is preferably totally reflected by the first incident surface 51. Further, another part of the second light L _{2 ′} incident on the light guide member 50 is reflected by the top surface 55 of the light guide member 50 without being reflected by the emission surface 54. At least a part of the second light L _{2 ′} reflected by the top surface 55 of the light guide member 50 in these optical paths is internally reflected by the internal reflection surface 52. At this time, the second light L _{2 ′} is preferably totally reflected by the internal reflection surface 52. Then, the second light L _{2 ′} internally reflected by the internal reflection surface 52 is emitted from the emission surface 54.

Further, another part of the second light L _{2 ′} emitted from the light pipe 72 is incident on the second light guide member 73 and is emitted from the front end face of the second light guide member 73. The second light L _{2 ′} emitted from the front end surface of the second light guide member 73 is refracted by the inner lens 74 and emitted from the inner lens 74.

Thus, _'the second light L ₂ emitted from the inner lens _74' second light L ₂ emitted from the emitting surface 54 of the light guide member 50 exits the light distribution of shown in FIG. 4 (C) is formed The

In the present embodiment, the second light source 42 that emits the second light L ₂ for high beam and the light pipe 72 that is the second light source that emits the second light L _{2 ′} for daytime illumination are separated. . For this reason, it is possible to easily form a high beam light distribution and a daytime light distribution separately.

  The present invention has been described above by taking the first to third embodiments as examples, but the present invention is not limited to these.

  For example, in the said embodiment, the vehicle headlamp 1 was set as the structure with which several lamp 1a-1c was continued. However, the vehicle headlamp of the present invention may be composed of one lamp. Moreover, even if the vehicle headlamp of the present invention is a case where a plurality of lamps are connected, the direction in which the lamps are connected and the number of the lamps are not particularly limited.

Further, in the first and second embodiments, one of the lamp 1a, the 2a, the second light L ₂ to the second light source 42 becomes the second light L ₂ and the light of day lighting as a high beam The total number of luminous fluxes was switched and emitted. However, the present invention is not limited to this, for example, as in the third embodiment, one of the second light L ₂ to the second light source 42 becomes the second light L ₂ and the light of day lighting as a high beam It may be configured to emit only the light. In this case, for example, in the vehicle headlamp 1, when the high beam, the second light source 42 of each of the plurality of lamp 1a~1c second light L ₂ emitted, when the irradiation of the daytime lighting, a plurality of only lamp 1a~1c out one of the lamp the second light source 42 may be configured to emit a second light _{L 2.}

In the above embodiment, the second light L ₂ and the second light L _{2 ′} emitted from the second light source are refracted so that the divergence angle becomes small at the second incident surface 53. This configuration is not essential. However, _'in view of adjusting the optical path of the better, the second light L ₂ and the second light L _2' second light L ₂ and the second light L ₂ diverge at a second incident surface 53 It is preferable to refract so that an angle becomes small.

In the above-described embodiment, at least a part of the reflected light L _1R reflected by the reflecting members 60 and 61 is light that irradiates above the low beam after being emitted from the emission surface 54. However, the reflected light L _1R may be irradiated only below the low beam cut line after being emitted from the emission surface 54.

  Moreover, in the said embodiment, although the reflection members 60 and 61 were provided, the reflection members 60 and 61 are not essential. Further, these reflecting members 60 and 61 may be simple shielding members that do not reflect light. However, from the viewpoint of effectively utilizing the light propagating to the position where the reflecting members 60 and 61 are provided, it is preferable not only to shield the light but also to reflect it. Moreover, even if it is a case where the reflection members 60 and 61 reflect light, or it is a case where it is a shielding member as mentioned above, these members are on the light guide member 50 like the said embodiment. Instead of being provided, a self-supporting reflecting member or shielding member may be provided apart from the light guide member. For example, in the case of the first embodiment, a self-supporting reflecting member or shielding member may be provided at a position separated from the first incident surface 51 between the first light source 41 and the first incident surface 51. In the case of a form, you may provide the reflective member and shielding member which can stand independently in the position spaced apart from the output surface 54. FIG. In these cases, the self-supporting reflecting member or shielding member may be fixed to the top plate 31.

  Moreover, in the said embodiment, although the output surface 54 of the light guide member 50 was made into convex shape, this invention is not restricted to this, For example, you may be made into planar shape.

In the third embodiment, the second light guide member 73 and the inner lens 74 are disposed in front of the light pipe 72, and a part of the second light L _{2 ′} emitted from the light pipe 72 is emitted. It was said. However, even in the case of the third embodiment, in the present invention, the second light guide member 73 and the inner lens 74 are not arranged, and for daytime illumination from members other than the emission surface 54 of the light guide member 50. The light may not be emitted.

In the third embodiment, the light pipe 72 is used as the second light source that emits the second light L _{2 ′} for daytime illumination. However, if the second light guide member 73 and the inner lens 74 are not arranged as described above, the second light L ₂ from the opening 35 toward the second incident surface 53 without using the light pipe 72. A light source such as an LED that emits _' may be used.

  In the above embodiment, each of the lamps 1a, 1b, and 1c includes the casing 10, and each lamp chamber LR of the lamps 1a, 1b, and 1c is partitioned by the casing 10, but in the present invention, The wall of the housing | casing 10 is not formed between each lamp 1a and the lamp 1b, and between the lamp 1b and the lamp 1c, but each lamp chamber LR may be connected spatially.

  ADVANTAGE OF THE INVENTION According to this invention, the lamp which can be reduced in size is provided, adjusting the light distribution of daytime illumination, and can be utilized in the field | area of illumination etc.

DESCRIPTION OF SYMBOLS 1 ... Vehicle headlamps 1a-1c, 2a, 3a ... Lamp 10 ... Case LU ... Lamp unit 30 ... Support member 31 ... Top plate 32 ... Back plate 41 ... 1st light source 42 ... 2nd light source 50 ... Light guide member 51 ... 1st entrance surface 52 ... Internal reflection surface 53 ... 2nd entrance surface 54 ... Output surface 60, 61 ... reflective member 72 ... light pipe (second light source)
73 ... second light guide member 74 ... inner lens _L 1 ... first light _{L 1R} ... reflected light _L 2, L _{2 ',} ... the second light

Claims (9)

A first light source that emits first light to be a low beam;
A second light source that emits second light to be irradiated above the low beam;
A first incident surface on which the first light emitted from the first light source is incident; a concave internal reflection surface that internally reflects the first light incident from the first incident surface; and internal reflection at the internal reflection surface A light guide member having an exit surface from which the first light exits;
With
The outer surface of the internal reflection surface of the light guide member is a second incident surface on which the second light emitted from the second light source is incident,
The vehicle headlamp according to claim 1, wherein the second light incident from the second incident surface is emitted from the emission surface. 2. The vehicle headlamp according to claim 1, wherein a divergence angle of the second light emitted from the second light source is reduced at the second incident surface. 3. The vehicle headlamp according to claim 1, wherein the second light source switches and emits a second light that becomes a high beam and a second light that becomes daytime illumination. 4. A shielding member is provided that shields at least a part of light other than light that is incident on the light guide member from the first incident surface and reflected by the internal reflection surface among the first light emitted from the first light source. The vehicle headlamp according to any one of claims 1 to 3, wherein the vehicle headlamp is provided. The vehicle headlamp according to claim 4, wherein the shielding member is provided between the first light source and the first incident surface. The vehicle headlamp according to claim 5, wherein the shielding member is provided on a partial region of the first incident surface. The shielding member is a reflecting member that reflects the first light from the first light source;
The at least part of the 1st light reflected by the said reflection member injects into the said light guide member, is reflected by the said internal reflection surface, and is radiate | emitted from the said output surface. The vehicle headlamp according to claim 1. The vehicle headlamp according to claim 7, wherein at least part of the first light reflected by the reflecting member is incident on the light guide member from the first incident surface. At least a part of the first light reflected by the reflecting member, incident on the light guide member and reflected by the internal reflecting surface is irradiated above the low beam after being emitted from the emitting surface. The vehicle headlamp according to claim 7 or 8, wherein

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