JP2022028514A - Vehicular headlight - Google Patents

Abstract

To reduce the number of components and costs.SOLUTION: A vehicular headlight comprises: a first light source for emitting first light; a second light source arranged below the first light source, and for emitting second light; a first reflecting surface arranged above the first light source, and for reflecting the first light frontward and downward; a second reflecting surface arranged below the first light source while extending frontward and backward, and for reflecting the first light reaching directly or via the first reflecting surface from the first light source, frontward; a third reflecting surface arranged above the second light source and below the second reflecting surface while extending frontward and backward, connected to the second reflecting surface at a front edge part so as to share the front edge part with the second reflecting surface, and for reflecting the second light from the second light source frontward; and a projection lens arranged in front of the first reflecting surface, the second reflecting surface, and the third reflecting surface, and for applying the first light and the second light frontward. The first light source and the second light source are arranged on the same plane so that respective emitting axes of the first light and the second light are directed frontward and obliquely upward.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle headlight.

As a vehicle headlight, for example, a configuration is known in which a first light source for forming a low beam pattern in front of the vehicle and a second light source for forming a high beam pattern that illuminates a distant place are provided in one unit. (For example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 2018-98105

The vehicle headlight described in Patent Document 1 has a configuration in which the first light source and the second light source are arranged on different surfaces. In this configuration, since it is necessary to separately form the mounting board for the first light source and the second light source, the number of parts increases and the cost increases.

The present invention has been made in view of the above, and an object of the present invention is to provide a vehicle headlight capable of reducing the number of parts and the cost.

The vehicle headlight according to the present invention has a first light source that emits a first light, a second light source that is arranged below the first light source and emits a second light, and an upper part of the first light source. A first reflecting surface that is arranged in the above and reflects the first light forward and downward, and a first reflecting surface that is arranged below the first light source in a state of extending back and forth and directly from the first light source or the first reflecting surface. A second reflecting surface that reflects the first light that arrives through the front, and a second reflecting surface that is arranged above the second light source and below the second reflecting surface in a state of extending back and forth. A third reflective surface, which is connected to the second reflective surface at the front edge portion so as to share a front edge portion between the two, and reflects the second light from the second light source forward, and the first reflective surface. The first light source and the second light source are provided with a projection lens arranged in front of the second reflecting surface and the third reflecting surface and irradiating the first light and the second light forward, respectively. The emission axes of the first light and the second light are arranged on the same plane so as to face diagonally upward in front.

In the vehicle headlight, the first reflecting surface, the second reflecting surface, and the third reflecting surface are formed on one light guide body capable of transmitting the first light and the second light. May be good.

In the vehicle headlight, the light guide is arranged below the first incident surface and the first incident surface on which the first light directed from the first light source toward the first reflecting surface is incident. It may have a second incident surface to which the first light incident from the first light source toward the second reflecting surface.

In the vehicle headlight, the projection lens has an incident surface on which the first light and the second light are incident, and an emitting surface on which the first light and the second light are emitted. The light guide has an emission surface that emits the first light and the second light, and the front edge portion includes an incident surface of the projection lens, an emission surface of the projection lens, and the light guide. It may be arranged at a focal point including the emission surface or at a position near the focal point.

The vehicle headlight further includes a third light source that is arranged in at least one of the left and right directions with respect to the first light source and emits a third light, and the light guide body is the light source from the third light source. It may have a side light guide portion that guides the third light and emits it toward the projection lens.

In the above-mentioned vehicle headlight, the first light is light for forming a low beam pattern in front of the vehicle, and the second light is light for forming a high beam pattern in front of the vehicle. The front edge portion may have a cutoff forming portion for forming a cutoff line in the low beam pattern.

The vehicle headlight further includes a substrate having at least a first light source and a planar mounting surface on which the second light source is mounted, and the substrate is diagonally upward in front of the normal of the mounting surface. It may be arranged so as to face.

According to the present invention, it is possible to provide a vehicle headlight capable of reducing the number of parts and the cost.

FIG. 1 is a diagram showing an example of a vehicle headlight according to the first embodiment. FIG. 2 is a diagram showing an example of a vehicle headlight according to the first embodiment. FIG. 3 is a vertical sectional view showing an example of a light guide body. FIG. 4 is a rear perspective view showing an example of the light guide body. FIG. 5 is a front perspective view showing an example of the light guide body. FIG. 6 is a diagram showing an example of a light distribution pattern illuminated on a virtual screen in front of the vehicle. FIG. 7 is a diagram showing an example of a vehicle headlight according to the second embodiment. FIG. 8 is a diagram showing an example of a vehicle headlight according to the second embodiment. FIG. 9 is a diagram showing an example of a light distribution pattern illuminated on a virtual screen in front of the vehicle.

Hereinafter, embodiments of the vehicle headlights according to the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

[First Embodiment]
1 and 2 are views showing an example of the vehicle headlight 100 according to the first embodiment. FIG. 1 is a vertical sectional view, and FIG. 2 is a diagram showing a configuration in a top view. As shown in FIGS. 1 and 2, the vehicle headlight 100 includes a light source unit 10, a light guide body 20, a projection lens 30, and a holding unit 40.

The light source unit 10 includes a first light source 11, a second light source 12, and a substrate 13. The first light source 11 emits, for example, the first light L1 for forming a low beam pattern in front of the vehicle. The second light source 12 emits, for example, the second light L2 for forming a high beam pattern in front of the vehicle.

As the first light source 11 and the second light source 12, a semiconductor type light source such as an LED is used. A plurality of the first light source 11 and the second light source 12 are provided, respectively, and are arranged in a row in the left-right direction. The number of the first light source 11 and the second light source 12 may be the same or different. The first light source 11 is arranged above the second light source 12. In other words, the second light source 12 is arranged below the first light source 11.

The first light source 11 and the second light source 12 are mounted on the mounting surface 13a of the substrate 13. In the present embodiment, the first light source 11 and the second light source 12 are mounted on one substrate 13. Therefore, it is not necessary to form a separate substrate for each light source, the number of parts can be reduced, and the cost can be reduced. The mounting surface 13a is planar. The substrate 13 is arranged on the substrate support surface 41 of the holding portion 40, which will be described later. The substrate 13 is arranged along the substrate support surface 41. The substrate 13 is arranged with the mounting surface 13a facing diagonally upward in the front direction. The first light source 11 and the second light source 12 are arranged in a state where the light emitting surface 11a and the light emitting surface 12a face diagonally upward in front. Therefore, the first light source 11 and the second light source 12 are arranged so that the emission axes of the first light L1 and the second light L2 face diagonally upward in front of each other.

The light guide 20 guides the first light L1 from the first light source 11 and the second light L2 from the second light source 12 and emits them toward the projection lens 30. 3 to 5 are views showing an example of the light guide body 20. 3 is a vertical sectional view, FIG. 4 is a perspective view seen from the rear, and FIG. 5 is a perspective view seen from the front.

As shown in FIGS. 3 to 5, the light guide body 20 has an upper light guide unit 21, a lower light guide unit 22, a common light guide unit 23, and an emission surface 24. The light guide body 20 is integrally formed of, for example, a light-transmitting light guide member made of resin or the like.

The upper light guide unit 21 has a first incident surface 21a, a second incident surface 21b, a first reflecting surface 21c, and a second reflecting surface 21d. The first light L1 from the first light source 11 is incident on the first incident surface 21a and the second incident surface 21b. The first incident surface 21a is arranged so as to face parallel to or substantially parallel to the light emitting surface 11a of the first light source 11. The second incident surface 21b is arranged below the first incident surface 21a and is inclined with respect to the first incident surface 21a. The second incident surface 21b is provided to efficiently guide the light emitted downward from the first light source 11 to the second reflecting surface 21d, which will be described later.

The first reflecting surface 21c internally reflects the first light L1 incident from the incident surface 21a. The first reflecting surface 21c extends forward from the upper end of the incident surface 21a. The first reflecting surface 21c has a shape curved so as to be convex upward, for example.

The second reflecting surface 21d internally reflects the first light L1 incident from the incident surface 21b. The second reflecting surface 21d extends from the lower side of the reflecting surface 21b toward the front. The second reflecting surface 21d has a shape curved so as to be convex upward, for example. The curvature of the second reflecting surface 21d may be the same as or different from the curvature of the first reflecting surface 21c.

The second reflecting surface 21d forms a leading edge portion 25 at the front end portion. The leading edge portion 25 is shared with the third reflecting surface 22c of the lower light guide portion 22 described later. The leading edge portion 25 has a first straight line portion 25a, an inclined portion 25b, and a second straight line portion 25c. The first straight line portion 25a and the second straight line portion 25c are portions for forming the horizontal cut-off line CLa and CLc (see FIG. 6) of the low beam pattern. The inclined portion 25b is a portion for forming an oblique cut-off line CLb (see FIG. 6) of a low beam pattern. The leading edge portion 25 is arranged at a position near the focal point F or the focal point F including the incident surface 31 of the projection lens 30 described later, the emission surface 32 of the projection lens 30, and the emission surface 24 of the light guide body 20. The lens. The first straight line portion 25a and the second straight line portion 25c may have a shape curved along the image plane of the projection lens 30.

The lower light guide portion 22 has a third incident surface 22a and a third reflecting surface 22c. The second light L2 from the second light source 12 is incident on the third incident surface 22a. The third incident surface 22a is arranged so as to face parallel to or substantially parallel to the light emitting surface 12a of the second light source 12.

The third reflecting surface 22c internally reflects the second light L2 incident from the third incident surface 22a. The third reflecting surface 22c extends forward from the upper end of the third incident surface 22a. The third reflecting surface 22c has a shape curved so as to be convex upward, for example. The third reflective surface 22c is connected to the leading edge portion 25 so as to share the leading edge portion 25.

At least one of the first reflecting surface 21c, the second reflecting surface 21d, and the third reflecting surface 22c may be composed of a reflecting surface of a light reflecting film such as a metal film. The light reflecting film is formed, for example, by thin film deposition.

The common light guide unit 23 is arranged in front of the upper light guide unit 21 and the lower light guide unit 22. The common light guide unit 23 guides the first light L1 and the second light L2 guided by the upper light guide unit 21 and the lower light guide unit 22 forward.

The emission surface 24 emits the first light L1 and the second light L2 guided by the upper light guide unit 21, the lower light guide unit 22, and the common light guide unit 23 toward the projection lens 30.

The projection lens 30 is arranged in front of the light guide body 20. The projection lens 30 has an entrance surface 31 and an emission surface 32. The first light L1 and the second light L2 from the light guide 20 are incident on the incident surface 31. The emission surface 32 emits the first light L1 and the second light L2 incident on the incident surface 31 to the front of the vehicle to form a low beam pattern and a high beam pattern.

The holding portion 40 has a substrate supporting surface 41 that supports the substrate 13 at the front portion. The substrate support surface 41 is, for example, flat and is arranged so as to face diagonally upward in the front direction. The holding unit 40 dissipates heat generated by the first light source 11 and the second light source 12. The holding portion 40 may be provided with a heat radiating portion (not shown) such as fins at the rear portion, the upper portion or the lower portion.

Next, the operation of the vehicle headlight 100 configured as described above will be described. By turning on the first light source 11 of the vehicle headlight 100, the first light L1 is emitted from the light emitting surface 11a. A part of the first light L1 (hereinafter referred to as the first light L1a) is incident on the light guide body 20 from the first incident surface 21a as shown in FIG. The first light L1a incident on the light guide 20 is reflected by the first reflecting surface 21c and reaches the emitting surface 24.

Further, a part of the first light L1 (hereinafter referred to as the first light L1b) is incident on the light guide body 20 from the first incident surface 21a and reflected by the first reflecting surface 21c as shown in FIG. Then, it is further reflected by the second reflecting surface 21d to reach the emitting surface 24.

Further, a part of the first light L1 (hereinafter referred to as the first light L1c) is incident on the light guide body 20 from the second incident surface 21b as shown in FIG. The first light L1c incident on the light guide body 20 passes through the leading edge portion 25 of the second reflecting surface 21d and reaches the emitting surface 24.

Further, a part of the first light L1 (hereinafter referred to as the first light L1d) is incident on the light guide body 20 from the second incident surface 21b as shown in FIG. The first light L1d incident on the light guide body 20 is reflected by the second reflecting surface 21d and reaches the emitting surface 24.

The first light L1a, L1b, L1c, and L1d that have reached the emission surface 24 are emitted from the emission surface 24 toward the projection lens 30, and are irradiated to the front of the vehicle by the projection lens 30.

FIG. 6 is a diagram showing an example of a light distribution pattern P illuminated on a virtual screen in front of the vehicle, and shows a pattern corresponding to a vehicle traveling on the left side. In FIG. 6, the VV line indicates the vertical line of the screen, and the HH line indicates the horizontal line on the left and right of the screen. Further, here, it is assumed that the intersection of the vertical line and the horizontal line is the reference position in the horizontal direction.

As shown in FIG. 6, the low beam pattern P1 is formed by the first lights L1a, L1b, L1c, and L1d irradiated to the front of the vehicle. For example, the first light L1a forms a lower portion of the low beam pattern P1 in the vertical direction. The central portion of the low beam pattern P1 is formed by the first lights L1b and L1d. The first light L1c forms an upper portion including the cut-off line CL of the low beam pattern P1. Cut-offline CL includes, for example, horizontal cut-off line CLa, CLc and diagonal cut-off line CLb.

Further, by turning on the second light source 12 of the vehicle headlight 100, the second light L2 is emitted from the light emitting surface 12a. A part of the second light L2 (hereinafter referred to as the second light L2a) is incident on the light guide body 20 from the third incident surface 22a as shown in FIG. The second light L2a incident on the light guide 20 passes below the third reflecting surface 22c and reaches the emitting surface 24. In this case, a part of the second light L2a reaches the exit surface 24 beyond the vicinity of the leading edge portion 25 which is the tip of the third reflection surface 22c.

Further, a part of the second light L2 (hereinafter referred to as the second light L2b) is incident on the light guide body 20 from the third incident surface 22a and reflected by the third reflecting surface 22c, as shown in FIG. It reaches the exit surface 24.

The second light L2a and L2b that have reached the emission surface 24 are emitted from the emission surface 24 toward the projection lens 30, respectively, and are irradiated to the front of the vehicle by the projection lens 30. As shown in FIG. 6, the high beam pattern P2 is formed by the second lights L2a and L2b irradiated to the front of the vehicle. For example, the second light L2a forms the lower portion of the high beam pattern P2. The second light L2b forms the upper portion of the high beam pattern P2.

In the present embodiment, the first light source 11 and the second light source 12 are arranged so that the emission axes of the first light L1 and the second light L2 face diagonally upward in front. Therefore, while arranging the first light source 11 so that the first light L1 passes through the leading edge portion 25 of the second reflecting surface 21d, the emission axis of the second light L2 is directed toward the vicinity of the leading edge portion 25. The second light source 12 can be arranged. With this configuration, a part of the second light L2a passes near the leading edge portion 25 and reaches the exit surface 24. Therefore, the lower portion of the high beam pattern P2 is formed in the vicinity of the horizontal cut-off line CLc of the low beam pattern P1. Therefore, it is possible to prevent the high beam pattern P2 from being formed in a state of being separated upward from the low beam pattern P1.

As described above, the vehicle headlight 100 according to the present embodiment has a first light source 11 that emits the first light L1 and a second light L2 that is arranged below the first light source 11 and emits the second light L2. A light source unit 10 having two light sources 12 and having the first light source 11 and the second light source 12 arranged on the same plane so that the emission axes of the first light L1 and the second light L2 face diagonally upward in front. , A first reflecting surface 21c arranged above the first light source 11 and reflecting the first light L1 forward and downward, and below the first light source 11 in a state of extending forward from the first light source 11. A second reflecting surface 21d that reflects the first light L1 that arrives directly or through the first reflecting surface 21c forward, and arranged above the second light source 12 and below the second reflecting surface 21d in a state of extending forward. The second light L2 from the second light source 12 is reflected forward by being connected to the second reflecting surface 21d at the front edge portion so as to share the front edge portion 25 with the second reflecting surface 21d. It includes a 3 reflecting surface 22c and a projection lens 30 arranged in front of the first reflecting surface 21c, the second reflecting surface 21d, and the third reflecting surface 22c and projecting the first light L1 and the second light L2 forward.

According to this configuration, since the first light source 11 and the second light source 12 are arranged on the same plane, the first light source 11 and the second light source 12 can be mounted on one substrate 13. Therefore, it is not necessary to form a separate substrate for each light source, the number of parts can be reduced, and the cost can be reduced. Further, since the first light source 11 and the second light source 12 are arranged so that the emission axes of the first light L1 and the second light L2 face diagonally upward in the front, the first light L1 is on the second reflecting surface 21d. The first light source 11 can be arranged so as to pass through the leading edge portion 25, and the second light source 12 can be arranged so that the emission axis of the second light L2 is directed to the vicinity of the leading edge portion 25. With this configuration, a part of the second light L2 passes near the leading edge portion 25 and reaches the exit surface 24, so that the pattern by the second light L2 is formed at a position in the upper vicinity of the pattern by the first light L1. can do.

In the vehicle headlight 100 according to the present embodiment, the first reflecting surface 21c, the second reflecting surface 21d, and the third reflecting surface 22c are one light guide body capable of transmitting the first light L1 and the second light L2. Formed at 20. According to this configuration, the positions of the first reflecting surface 21c and the second reflecting surface 21d can be adjusted with high accuracy.

In the vehicle headlight 100 according to the present embodiment, the light guide body 20 has a first incident surface 21a on which the first light L1 directed from the first light source 11 toward the first reflecting surface 21c is incident, and a first incident surface 21a. It has a second incident surface 21b to which the first light L1 directed from the first light source 11 toward the second reflecting surface 21d is incident. According to this configuration, a part of the first light L1 (first light L1c) can be efficiently reached to the second reflecting surface 21d.

The projection lens 30 has an incident surface 31 on which the first light L1 and the second light L2 are incident, and an exit surface 32 that emits the first light L1 and the second light L2. It has an emission surface 24 that emits light L1 and second light L2, and the front edge portion 25 includes an incident surface 31 of the projection lens 30, an emission surface 32 of the projection lens 30, and an emission surface 24 of the light guide body 20. According to this configuration, which is arranged at a focal point F composed of the focal point F or a position in the vicinity of the focal point F, a pattern can be formed with higher accuracy in front of the vehicle.

In the vehicle headlight 100 according to the present embodiment, the first light L1 is light for forming a low beam pattern P1 in front of the vehicle, and the second light L2 is for forming a high beam pattern in front of the vehicle. It is light, and the front edge portion 25 has a cutoff forming portion (first straight line portion 25a, inclined portion 25b, second straight line portion 25c) for forming a cutoff line CL in the low beam pattern P1. According to this configuration, the lower portion of the high beam pattern P2 is formed in the vicinity of the horizontal cut-off line CLc of the low beam pattern P1. As a result, it is possible to prevent the high beam pattern P2 from being formed in a state of being separated upward from the low beam pattern P1.

In the vehicle headlight 100 according to the present embodiment, the light source unit 10 has a substrate 13 having a planar mounting surface 13a on which the first light source 11 and the second light source 12 are mounted, and the substrate 13 is mounted. The normal line of the surface 13a is arranged so as to face diagonally upward in front. According to this configuration, it is possible to reduce the cost while setting the directions and positions of the first light source 11 and the second light source 12 with high accuracy.

[Second Embodiment]
7 and 8 are views showing an example of the vehicle headlight 200 according to the second embodiment. As shown in FIGS. 7 and 8, the vehicle headlight 200 includes a light source unit 110, a light guide body 120, a projection lens 30, and a holding unit 40. In the second embodiment, since the configurations of the light source unit 110 and the light guide body 120 are different from those in the first embodiment, the differences will be mainly described. In the second embodiment, the same reference numerals are given to the configurations common to the first embodiment, and the description thereof will be omitted or simplified.

The vehicle headlight 200 is different from the vehicle headlight 100 according to the first embodiment in that the light guide body 120 has side light guide portions 26 and 27 at the left and right ends. Further, the vehicle headlight 200 is for a vehicle according to the first embodiment in that the light source unit 110 is provided with the third light sources 16 and 17 for supplying light to the side light guide units 26 and 27. It is different from the headlight 100.

The third light sources 16 and 17 emit the third light L3 for forming the diffused portion (P1a, P1b: see FIG. 9) of the low beam pattern P1. The third light sources 16 and 17 are mounted on the mounting surface 13a of the substrate 13 like the first light source 11 and the second light source 12. The third light source 16 is arranged at a position separated to the left with respect to the first light source 11. Further, the third light source 17 is arranged at a position distant to the right from the first light source 11. The third light sources 16 and 17 have light emitting surfaces 16a and 17a. The third light sources 16 and 17 are arranged so that the light emitting surfaces 16a and 17a face diagonally upward in the front, respectively.

As shown in FIG. 8, the side light guide portion 26 has a front side incident surface 26a, a tubular incident surface 26b, a reflecting surface 26c, and an emitting surface 26d. Similarly, the side light guide portion 27 has a front side incident surface 27a, a tubular incident surface 27b, a reflecting surface 27c, and an emitting surface 27d.

The front-side incident surfaces 26a and 27a face the light emitting surfaces 16a and 17a of the third light sources 16 and 17. The incident surfaces 26a and 27a on the front side are convex surfaces or planes protruding toward the third light sources 16 and 17.

The tubular incident surfaces 26b and 27b are arranged along the cylindrical surface so as to surround the light emitting surfaces 16a and 17a of the third light sources 16 and 17 and the front-side incident surfaces 26a and 27a. The cylindrical incident surfaces 26b and 27b are formed so that the central axis is inclined inward in the left-right direction (on the optical axis AX side). The outer portions of the tubular incident surfaces 26b and 27b are in a state of being elongated in the front-rear direction as compared with the inner portions.

The operation of the vehicle headlight 200 configured as described above will be described. Hereinafter, the case where the third light source 16 is turned on among the third light sources 16 and 17 will be described, but the same description can be made for the case where the third light source 17 is turned on. By turning on the third light source 16 of the vehicle headlight 200, the third light L3 is emitted from the light emitting surface 16a. As shown in FIG. 8, a part of the third light L3 (hereinafter referred to as the third light L3a) is incident on the side light guide portion 26 of the light guide body 20 from the front side incident surface 26a. The third light L3a incident on the side light guide unit 26 travels in the side light guide unit 26 and reaches the emission surface 26d.

Further, a part of the third light L3 (hereinafter referred to as the third light L3b) is connected to the side light guide portion 26 of the light guide body 20 from the inner portion of the cylindrical incident surface 26b as shown in FIG. Incident. The third light L3b incident on the side light guide unit 26 is reflected by the inner portion of the reflecting surface 26c and reaches the emitting surface 26d.

Further, a part of the third light L3 (hereinafter referred to as the third light L3c) is connected to the side light guide portion 26 of the light guide body 20 from the outer portion of the cylindrical incident surface 26b as shown in FIG. Incident. The third light L3c incident on the side light guide unit 26 is reflected by the outer portion of the reflecting surface 21c and reaches the emitting surface 26d.

The third light L3a, L3b, and L3c that have reached the emission surface 26d are emitted from the emission surface 26d toward the projection lens 30, and are irradiated to the front of the vehicle by the projection lens 30.

FIG. 9 is a diagram showing an example of a light distribution pattern P illuminated on a virtual screen in front of the vehicle, and shows a pattern corresponding to a vehicle traveling on the left side. In FIG. 9, the VV line indicates the vertical line of the screen, and the HH line indicates the horizontal line on the left and right of the screen. Further, here, it is assumed that the intersection of the vertical line and the horizontal line is the reference position in the horizontal direction.

As shown in FIG. 9, the diffusion portion P1a of the low beam pattern P1 is formed by the third light L3a, L3b, L3c irradiated to the front of the vehicle. For example, the third light L3a forms a central portion in the left-right direction of the diffusion portion P1a. The third light L3b forms an outer portion in the left-right direction of the diffusion portion P1a. The third light L3c forms an inner portion in the left-right direction of the diffusion portion P1a.

In the present embodiment, the light emitting surface 16a of the third light source 16 is directed forward, whereas the central axis of the cylindrical incident surface 26b is inclined inward on the front side. Therefore, the third light L3 emitted from the light emitting surface 16a is incident on the outer portion of the tubular incident surface 26b at a shallower incident angle than the inner portion of the tubular incident surface 26b. That is, the intensity of the third light L3c incident on the outer portion of the tubular incident surface 26b is higher than that of the third light L3b incident on the inner portion of the tubular incident surface 26b. Therefore, since the third light L3c having high intensity forms the inner portion in the left-right direction of the diffused portion P1a, it is possible to form a light distribution having high luminous intensity in the inner portion in the left-right direction of the diffused portion P1a. Further, since the third light L3b having a low intensity forms the outer portion in the left-right direction of the diffused portion P1a, it is possible to form a light distribution having a low luminous intensity in the outer portion in the left-right direction of the diffused portion P1a. As a result, in the diffused portion P1a, the light distribution can be formed so that the luminous intensity decreases from the inside to the outside in the left-right direction.

As described above, in the vehicle headlight 200 according to the second embodiment, the light source unit 110 is arranged on at least one of the left and right directions with respect to the first light source 11 and emits the third light L3. , 17 and the light guide 120 has side light guides 26, 27 that guide the third light L3 from the third light sources 16 and 17 and emit it toward the projection lens 30. With this configuration, the third light sources 16 and 17 can be used to form a pattern separate from the first light source 11 and the second light source 12 in front of the vehicle. Since the side light guide portions 26 and 27 are integrally provided with the light guide body 120, the number of parts and the cost can be suppressed.

In the second embodiment, the third light sources 16 and 17 are provided separately from the first light source 11 and the second light source 12 in order to form the diffusion portions P1a and P1b of the low beam pattern P1. In this configuration, the side light guide portions 26 and 27 guide the third light L3 from the third light sources 16 and 17 separately from the first light L1 and the second light L2 to form a unique pattern. be able to. For example, when the side reflector is arranged on the side of the upper light guide portion 21, it is possible to form a diffused portion on the outside in the left-right direction of the low beam pattern P1 by the side reflector, but the second light source 12 is the second. The light L2 may be reflected by the side reflectors to form an unintended pattern. In the present embodiment, by associating the side light guide portions 26, 27 with the third light sources 16 and 17, it is possible to surely form a target pattern and suppress the formation of an unintended pattern.

The technical scope of the present invention is not limited to the above-described embodiment, and changes can be made as appropriate without departing from the spirit of the present invention. For example, the configuration in which the first reflecting surface 21c, the second reflecting surface 21d, and the third reflecting surface 22c are formed on the light guide bodies 20 and 120 has been described as an example, but the present invention is not limited thereto. For example, the light guide bodies 20 and 120 may not be provided, and the first reflecting surface 21c, the second reflecting surface 21d, and the third reflecting surface 22c may be separately configured by a reflector or the like.

CL ... Cut offline, CLa, CLc ... Horizontal cut offline, CLb ... Diagonal cut offline, L1, L1a, L1b, L1c, L1d ... 1st light, L2, L2a, L2b ... 2nd light, L3, L3a, L3b, L3c ... Third light, P ... Light distribution pattern, P1 ... Low beam pattern, P2 ... High beam pattern, P1a, P1b ... Diffuse part, 10,110 ... Light source unit, 11 ... First light source, 11a, 12a, 16a, 17a ... Light emission Surface, 12 ... second light source, 13 ... substrate, 13a ... mounting surface, 16, 17 ... third light source, 20, 120 ... light guide body, 21 ... upper light guide portion, 21a ... first incident surface, 21b ... first 2 incident surface, 21c ... first reflecting surface, 21d ... second reflecting surface, 22 ... lower light guide unit, 22a ... third incident surface, 22c ... third reflecting surface, 23 ... common light guide unit, 24, 26d , 27d, 32 ... Emission surface, 25 ... Front edge portion, 25a ... First straight portion, 25b ... Inclined portion, 25c ... Second straight portion, 26, 27 ... Lateral light guide portion, 26a, 27a ... Front side incident Surface, 26b, 27b ... Cylindrical incident surface, 26c, 27c ... Reflecting surface, 30 ... Projecting lens, 31 ... Incident surface, 40 ... Holding part, 41 ... Board support surface, 100, 200 ... Vehicle headlight

Claims (7)

The first light source that emits the first light and
A second light source arranged below the first light source and emitting a second light,
A first reflecting surface arranged above the first light source and reflecting the first light forward and downward,
A second reflecting surface that is arranged below the first light source in a state of extending back and forth and that reflects the first light forward that reaches from the first light source directly or through the first reflecting surface.
The second reflection is arranged above the second light source and below the second reflection surface in a state of extending back and forth, and at the front edge portion so as to share the leading edge portion with the second reflection surface. A third reflective surface that is connected to the surface and reflects the second light from the second light source forward.
A projection lens arranged in front of the first reflecting surface, the second reflecting surface, and the third reflecting surface and irradiating the first light and the second light forward is provided.
The first light source and the second light source are headlights for vehicles arranged on the same plane so that the emission axes of the first light and the second light face diagonally upward in the front, respectively. The vehicle front according to claim 1, wherein the first reflecting surface, the second reflecting surface, and the third reflecting surface are formed on one light guide body capable of transmitting the first light and the second light. Illuminated light. The light guide body is
A first incident surface on which the first light incident from the first light source toward the first reflecting surface is incident.
The vehicle headlight according to claim 2, which is arranged below the first incident surface and has a second incident surface on which the first light is incident from the first light source toward the second reflecting surface. The projection lens has an incident surface on which the first light and the second light are incident, and an exit surface on which the first light and the second light are emitted.
The light guide has an exit surface that emits the first light and the second light.
Claim 2 or claim 2 or claim, wherein the front edge portion is arranged at a focal point including an incident surface of the projection lens, an emission surface of the projection lens, and an emission surface of the light guide, or at a position near the focal point. The vehicle headlight according to 3. A third light source that is arranged on at least one of the left and right directions with respect to the first light source and emits a third light is further provided.
The method according to any one of claims 2 to 4, wherein the light guide has a side light guide portion that guides the third light from the third light source and emits the third light toward the projection lens. Headlights for vehicles. The first light is light for forming a low beam pattern in front of the vehicle.
The second light is light for forming a high beam pattern in front of the vehicle.
The vehicle headlight according to any one of claims 1 to 5, wherein the leading edge portion has a cutoff forming portion for forming a cutoff line in the low beam pattern. Further comprising a substrate having at least the first light source and a planar mounting surface on which the second light source is mounted.
The vehicle headlight according to any one of claims 1 to 6, wherein the board is arranged with the normal of the mounting surface facing diagonally upward in front.

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