Vehicular lighting fixture

Abstract

To provide a vehicular lighting fixture which can enhance utilization efficiency of light and which can acquire a favorable light distribution pattern.SOLUTION: A vehicular lighting fixture includes: a light source 3 for radially emitting light obliquely upward in front; a projection lens 5 for projecting the light emitted from the light source 3 toward the front of a vehicle; and a reflection optical system for reflecting the light emitted from the light source 3 toward the projection lens 5. The reflection optical system includes a first reflection surface and a second reflection surface positioned further on the obliquely upward side in front than the light source 3. The first reflection surface forms a surface curved in an outwardly convex manner on a cross section in the vertical direction; thereby, reflects the light toward the projection lens 5 while condensing the light. The second reflection surface forms a surface curved in an inwardly concave manner on the cross section in the vertical direction; thereby, reflects the light toward the projection lens 5 while diffusing the light.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle lamp. [Background technology]

[0002] For example, a vehicle lighting fixture such as a vehicle headlamp emits light as a passing beam (low beam) that forms a low beam light distribution pattern including a cutoff line at the upper end toward the front of the vehicle, or emits light as a driving beam (high beam) that forms a high beam light distribution pattern above the low beam light distribution pattern toward the front of the vehicle.

[0003] Meanwhile, in the field of vehicle lighting, development is underway on an adaptive beam distribution headlamp (ADB), which includes multiple light sources arranged in a row in the vehicle width direction and a projection lens that projects light emitted from the multiple light sources toward the front of the vehicle, and which variably controls the light distribution pattern of the light projected by the projection lens by switching on and off the multiple light sources (see, for example, Patent Document 2 listed below). ADB is a technology that uses an on-board camera to recognize vehicles ahead, oncoming vehicles, pedestrians, etc., and expands the driver's forward field of vision at night without dazzling the driver or pedestrians in front.

[0004] Additionally, some vehicle lighting fixtures integrate a low beam optical system and a high beam optical system, with the light sources of each being installed on the same plane so that the emission axes of the respective lights point diagonally upward and forward (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-28514 [Patent Document 2] Japanese Patent Application Publication No. 2019-220404 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional vehicle lighting fixtures described above, when light emitted from the light source diagonally upward and forward is reflected by a reflective surface toward a projection lens in front, the efficiency of capturing light passing near the focal point of the projection lens deteriorates, resulting in an insufficient maximum luminous intensity of the high beam light distribution pattern.

[0007] On the other hand, by reducing the vertical dimensions of the light exit surface of the light guide lens, the density of the light passing near the focal point of the projection lens increases, improving the luminous intensity, but the vertical spread of the light projected by the projection lens becomes insufficient.

[0008] The present invention has been proposed in view of the above-described conventional circumstances, and aims to provide a vehicle lamp that improves light utilization efficiency and makes it possible to obtain a good light distribution pattern. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides the following means. [1] A light source that emits light radially diagonally upward in front of the vehicle; a projection lens disposed in front of the light source and configured to project the light emitted from the light source toward the front of the vehicle; a reflection optical system disposed between the light source and the projection lens, which reflects the light emitted from the light source toward the projection lens; the reflection optical system has a first reflection surface and a second reflection surface located obliquely above and in front of the light source, the second reflecting surface and the first reflecting surface are arranged side by side in this order toward the front of the light source so that, in a vertical cross section including an optical axis of the light emitted from the light source, light in a central region including the optical axis of the light emitted radially from the light source is incident on the first reflecting surface, and light in peripheral regions above the central region is incident on the second reflecting surface; the first reflecting surface forms an outwardly convex curved surface in the vertical cross section, thereby concentrating the light in the central region and reflecting it toward the projection lens; The second reflective surface forms an inwardly concave curved surface in the vertical cross section, thereby diffusing light from the upper peripheral area and reflecting it toward the projection lens. [2] The vehicular lamp according to [1], characterized in that a light distribution pattern obtained by superimposing a first light distribution pattern formed by light from the central region and a second light distribution pattern formed by light from the upper peripheral region is projected forward while being inverted upside down by the projection lens. [3] The vehicular lamp according to [2], wherein the second light distribution pattern has a larger illumination range in the vertical direction than the first light distribution pattern, and the first light distribution pattern has a higher maximum luminous intensity than the second light distribution pattern. [4] The vehicular lamp according to [1], wherein the first reflecting surface and the second reflecting surface form a continuous surface. [5] The reflection optical system is configured as a part of a light guide lens, the light guide lens has an incident surface located on a side facing the light source, the first reflecting surface and the second reflecting surface located diagonally above and in front of the light source, and an exit surface located on a side facing the projection lens, the incident surface allows light emitted from the light source to enter the inside of the light guiding lens, The vehicular lamp according to [1], wherein the light exit surface emits light guided inside the light guide lens to the outside of the light guide lens toward the projection lens. [6] The incident surface forms a surface inclined obliquely downward toward the front in the vertical cross section, and The vehicle lamp according to [5], characterized in that, of the light radially emitted from the light source, light from a peripheral region below the central region is incident on the light emitting surface and enters the inside of the light guide lens. [7] The vehicular lamp according to [6], characterized in that a light distribution pattern obtained by superimposing a first light distribution pattern formed by light in the central region, a second light distribution pattern formed by light in the upper peripheral region, and a third light distribution pattern formed by light in the lower peripheral region is projected forward while being inverted upside down by the projection lens. [8] The vehicular lamp according to [7], characterized in that the illumination range in the vertical direction increases in the order of the second light distribution pattern, the third light distribution pattern, and the first light distribution pattern, and the maximum luminous intensity increases in the order of the first light distribution pattern, the second light distribution pattern, and the third light distribution pattern. [9] A plurality of the light sources are arranged in a line in the width direction of the vehicle, the reflection optical system is disposed corresponding to each of the light sources, The vehicle lamp according to [1], characterized in that the light distribution pattern of the light projected by the projection lens is variably controlled while switching on and off the plurality of light sources.

[10] A plurality of the light sources are arranged in a line in the width direction of the vehicle, the light guide lens has the incident surface, the first reflecting surface, the second reflecting surface, and the exit surface, which are arranged corresponding to each of the light sources; the light exit surface is provided continuously in the width direction of the light guide lens, The vehicle lamp according to [5], characterized in that the light distribution pattern of the light projected by the projection lens is variably controlled while switching on and off the plurality of light sources. [Effects of the Invention]

[0010] As described above, according to the present invention, a vehicle lamp that can improve the light utilization efficiency and obtain a good light distribution pattern is provided. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view showing a configuration of a vehicle lamp according to an embodiment of the present invention. [Figure 2]2 is a top view of a light source, a light guide lens, and a projection lens provided in the vehicle lamp shown in FIG. 1. [Figure 3] FIG. 2 is a front view of the light guide lens shown in FIG. [Figure 4] FIG. 2 is a rear perspective view of the light guide lens shown in FIG. [Figure 5] 2 is a cross-sectional view showing the optical path of light in a first region out of light radially emitted from a light source in the light guide lens shown in FIG. 1. FIG. [Figure 6] 2 is a cross-sectional view showing the optical path of a second light beam among the light beams radially emitted from the light source in the light guide lens shown in FIG. 1. FIG. [Figure 7] 1. FIG. 4 is a cross-sectional view showing the optical path of a third light beam among the light beams radially emitted from the light source in the light guide lens shown in FIG. [Figure 8] 8 is a schematic diagram showing a light distribution pattern formed by the first, second, and third light beams shown in FIGS. 5 to 7. FIG. [Figure 9] FIG. 7 is a luminous intensity distribution diagram showing a light distribution pattern formed by the first light shown in FIG. [Figure 10] FIG. 8 is a luminous intensity distribution diagram showing a light distribution pattern formed by the second light shown in FIG. [Figure 11] FIG. 9 is a luminous intensity distribution diagram showing a light distribution pattern formed by the third light shown in FIG. [Figure 12] FIG. 12 is a luminous intensity distribution diagram showing a light distribution pattern obtained by superimposing the first, second, and third light distribution patterns shown in FIGS. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings used in the following description, the dimensions of the components may be shown at different scales to make them easier to see, and the dimensional ratios of the components may not necessarily be the same as in reality.

[0013] As an embodiment of the present invention, the configuration of a vehicle lamp 1 shown in, for example, FIGS. 1 to 12 will be described.

[0014] FIG. 1 is a side view showing the configuration of the vehicular lamp 1. FIG. 2 is a top view of the light source 3, the light guide lens 4, and the projection lens 5 provided in the vehicular lamp 1. FIG. 3 is a front view of the light guide lens 4. FIG. 4 is a rear perspective view of the light guide lens 4. FIG. 5 is a cross-sectional view showing the optical path of a first light L1 among the light L radially emitted from the light source 3 in the light guide lens 4. FIG. 6 is a cross-sectional view showing the optical path of a second light L2 among the light L radially emitted from the light source 3 in the light guide lens 4. FIG. 7 is a cross-sectional view showing the optical path of a third light L3 among the light L radially emitted from the light source 3 in the light guide lens 4. FIG. 8 is a schematic diagram showing a light distribution pattern P formed by the first, second, and third lights L1, L2, and L3. FIG. 9 is a luminous intensity distribution diagram showing a first light distribution pattern P1 formed by the first light L1. FIG. 10 is a luminous intensity distribution diagram showing a second light distribution pattern P2 formed by the second light L2. Fig. 11 is a luminous intensity distribution diagram showing a third light distribution pattern P3 formed by the third light L3. Fig. 12 is a luminous intensity distribution diagram showing a light distribution pattern P in which the first, second, and third light distribution patterns P1, P2, and P3 are superimposed.

[0015] In addition, in the drawings shown below, an XYZ Cartesian coordinate system is set up, with the X-axis direction representing the front-to-rear direction (length direction) of the vehicle lighting fixture 1, the Y-axis direction representing the left-to-right direction (width direction) of the vehicle lighting fixture 1, and the Z-axis direction representing the up-to-down direction (height direction) of the vehicle lighting fixture 1.

[0016] The vehicle lighting device 1 of this embodiment is a vehicle headlamp mounted on both corners of the front end of a vehicle (not shown), and emits a passing beam (low beam) that forms a low beam light distribution pattern including a cut-off line at the upper end, and a driving beam (high beam) that forms a high beam light distribution pattern above the low beam light distribution pattern, toward the front of the vehicle (in the +X-axis direction).

[0017] Among these, the vehicle lamp 1 of this embodiment is an application of the present invention to an adjustable beam distribution headlamp (ADB) that variably controls the light distribution pattern of light projected forward from the vehicle.

[0018] Specifically, this vehicle lamp 1 includes an ADB lamp unit 20 arranged inside a lamp body (not shown) as shown in Figures 1 and 2. The lamp unit 20 includes a plurality of lamp cells 2 arranged side by side in the width direction of the vehicle (hereinafter referred to as "vehicle width direction"), and has an integrated structure in which the plurality of lamp cells 2 are integrated.

[0019] The lamp unit 20 includes a plurality of light sources 3 corresponding to the plurality of lamp cells 2, and a light guide lens 4 and a projection lens 5 shared among the plurality of lamp cells 2. That is, each lamp cell 2 is composed of a light source 3, a light guide lens 4, and a projection lens 5.

[0020] The light sources 3 are composed of light emitting elements such as light emitting diodes (LEDs) that emit white light or laser diodes (LDs). The light sources 3 are arranged side by side in the vehicle width direction on the front side of a circuit board 6 on which a drive circuit (not shown) that drives the light sources 3 is provided.

[0021] The circuit board 6 is disposed in a state inclined diagonally downward toward the front, so that each light source 3 emits light L radially with its optical axis AX directed diagonally upward toward the front.

[0022] The circuit board 6 is not limited to the configuration in which the drive circuit is provided as described above, but may be configured such that a mounting board on which the plurality of light sources 3 are mounted and a circuit board on which the drive circuit is provided are separately arranged, and these mounting boards and circuit boards are electrically connected via a wiring cord (harness). This makes it possible to protect the drive circuit from the heat generated by the plurality of light sources 3.

[0023] Furthermore, a heat sink that dissipates heat generated by the multiple light sources 3 to the outside and a cooling fan that blows air toward the heat sink may be provided on the rear side of the circuit board 6. This allows the heat generated by the multiple light sources 3 to be efficiently dissipated to the outside.

[0024] 1 to 4, the light guide lens 4 is made of a light-transmitting material such as a transparent resin such as polycarbonate or acrylic, or glass. The light guide lens 4 is disposed between the plurality of light sources 3 and the projection lens 5.

[0025] The light guide lens 4 has a lens body 4a extending in the width direction, a plurality of protrusions 4b protruding rearward from the back side of the lens body 4a in correspondence with the plurality of light sources 3, and a plurality of grooves 4c separating the plurality of protrusions 4b. In other words, the light guide lens 4 has a structure in which the plurality of protrusions 4b are aligned in the width direction and connect the lens bodies 4a adjacent to each other in the width direction.

[0026] As shown in Figures 5 to 7, the light-guiding lens 4 has an incident surface 7 located on the tip side (back side) of each protrusion 4b, a first reflecting surface 8 and a second reflecting surface 9 located diagonally upward (top side) in front of the light source 3, and an exit surface 10 located on the side facing the projection lens 5 (front side).

[0027] The incident surface 7 is provided on the tip side of each protrusion 4b, facing each light source 3. The incident surface 7 forms a surface that is inclined diagonally downward and forward in a vertical cross section (hereinafter referred to as a "vertical cross section") that includes the optical axis AX of the light L emitted from the light source 3. On the other hand, the incident surface 7 forms a surface that is approximately perpendicular to the optical axis AX in a horizontal cross section (hereinafter referred to as a "horizontal cross section") that includes the optical axis AX of the light L emitted from the light source 3 and in the vertical cross section.

[0028] As a result, each incident surface 7 allows the light L emitted from each light source 3 to enter the inside of the protrusion 4b (light guide lens 4).

[0029] Specifically, of the light L radially emitted from the light source 3, light L1 from a central region E1 including the optical axis AX shown in FIG. 5 (hereinafter referred to as "first light") is incident on the inside of the light guide lens 4 toward the first reflecting surface 8. On the other hand, light L2 from a peripheral region E2 above the central region E1 shown in FIG. 6 (hereinafter referred to as "second light") is incident on the inside of the light guide lens 4 toward the second reflecting surface 9. On the other hand, light L3 from a peripheral region E3 below the central region E1 shown in FIG. 7 (hereinafter referred to as "third light") is incident on the inside of the light guide lens 4 toward the emission surface 10.

[0030] The first reflecting surface 8 and the second reflecting surface 9 constitute a reflecting optical system 40 on the upper surface side of the light guide lens 4 that reflects the light L emitted from the light source 3 toward the projection lens 5.

[0031] The reflection optical system 40 has a structure in which, in a vertical cross section of the light guide lens 4, the second reflection surface 9 and the first reflection surface 8 are arranged side by side in this order toward the front of the light source 3 so that, of the light L radially emitted from the light source 3, a first light L1 is incident on the first reflection surface 8 and a second light L2 is incident on the second reflection surface 9. In addition, the first reflection surface 8 and the second reflection surface 9 form a continuous surface on the upper surface side of the light guide lens 4.

[0032] The first reflecting surface 8 forms a surface that is curved in an outward convex shape in the vertical cross section of the light guiding lens 4. This allows the first light L1 that has entered the first reflecting surface 8 to be reflected toward the output surface 10 in front of the first reflecting surface 8 while being condensed.

[0033] Furthermore, in the vertical cross section of the light guide lens 4, it is preferable that the optical axis AX is located near the center of the first reflecting surface 8. This makes it possible for the strong light (first light L1) in the central region E1 including the optical axis AX, out of the light L radially emitted from the light source 3, to be incident on the first reflecting surface 8.

[0034] Furthermore, it is preferable that the focal point of the first light L1 focused by the first reflecting surface 8 coincides with the focal point S of the projection lens 5. This makes it possible to precisely control the first light L1 reflected from the first reflecting surface 8 toward the projection lens 5.

[0035] On the other hand, the second reflecting surface 9 forms a surface that is curved inwardly concavely in the vertical cross section of the light guiding lens 4. As a result, the second light L2 incident on the second reflecting surface 9 is reflected toward the output surface 10 in front while being diffused.

[0036] The exit surface 10 forms a surface that is continuous in the width direction of the lens body 4a (light guide lens 4) on the front side of the lens body 4a (light guide lens 4). The exit surface 10 forms a surface that is curved outwardly convexly in a vertical cross section of the light guide lens 4. On the other hand, the exit surface 10 forms a surface that is curved inwardly concavely in a horizontal cross section of the light guide lens 4.

[0037] As a result, the light exit surface 10 emits the light L guided inside the light guide lens 4 toward the projection lens 5 and out of the lens body 4a (light guide lens 4).

[0038] Specifically, of the light L guided inside the light-guiding lens 4, the first light L1 is reflected while being concentrated by the first reflecting surface 8, the second light L2 is reflected while being diffused by the second reflecting surface 9, and the third light L3 is incident while being diffused from the incident surface 7, and these are each emitted from the exit surface 10 toward the projection lens 5 in front.

[0039] The lower surface of the light guide lens 4 forms a surface that connects the incident surface 7 and the exit surface 10 together.

[0040] The projection lens 5 is made of a light-transmitting material such as a transparent resin such as polycarbonate or acrylic, or glass. The projection lens 5 is disposed in front of the light guide lens 4. The projection lens 5 extends in the width direction, and is configured as a biconvex lens whose rear and front sides are curved outwardly convexly in its vertical cross section.

[0041] As a result, the projection lens 5 projects the light L emitted from the emission surface 10 of the light guide lens 4 toward the front of the vehicle while enlarging the light L.

[0042] In the vehicle lamp 1 of this embodiment having the above-described configuration, as shown in FIG. 8, a first light distribution pattern P1 formed by the first light L1, a second light distribution pattern P2 formed by the second light L2, and a third light distribution pattern P3 formed by the third light L3 are superimposed (combined) to form a single light distribution pattern P as a whole, and this light distribution pattern P is projected toward the front of the vehicle while being upside down by the projection lens 5.

[0043] In addition, in the vehicle lighting fixture 1 of this embodiment, in the ADB lamp unit 20, it is possible to variably control the light distribution pattern P of the light L projected toward the front of the vehicle by switching on and off multiple light sources 3.

[0044] FIG. 9 shows a first light distribution pattern P1 obtained by simulation when a first light L1 is projected in a direction forward from the projection lens 5 onto a virtual vertical screen directly facing the projection lens 5. FIG. 10 shows a second light distribution pattern P2 obtained when a second light L2 is projected in a direction forward from the projection lens 5 onto a virtual vertical screen directly facing the projection lens 5. FIG. 11 shows a third light distribution pattern P3 obtained when a third light L3 is projected in a direction forward from the projection lens 5 onto a virtual vertical screen directly facing the projection lens 5. FIG. 12 shows a light distribution pattern P obtained when light L (first, second, and third lights L1, L2, and L3) is projected in a direction forward from the projection lens 5 onto a virtual vertical screen directly facing the projection lens 5. In FIGS. 9 to 11, solid lines indicate light rays close to the optical axis AX of each light L1, L2, and L3, and dashed lines indicate light rays far from the optical axis AX of each light L1, L2, and L3.

[0045] In the vehicle lamp 1 of this embodiment, the above-mentioned first light L1 is incident from the incident surface 7 toward the first reflecting surface 8, and then is focused by this first reflecting surface 8 and reflected toward the forward exit surface 10.

[0046] At this time, as shown in Figure 9, the optical axis AX of the first light L1 is located near the center of the first reflecting surface 8 in the vertical cross section of the light-guiding lens 4, and after it enters the first reflecting surface 8, it is reflected while being condensed toward the exit surface 10 so that the light ray closer to the optical axis AX passes through the side closer to the focal point S of the projection lens 5.

[0047] As a result, the first light L1 emitted from the emission surface 10 forms a first light distribution pattern P1 with a high luminous intensity on the side of the horizon H on the imaginary vertical screen, as shown in FIG.

[0048] On the other hand, in the vehicle lamp 1 of this embodiment, the above-mentioned second light L2 is incident from the incident surface 7 toward the second reflecting surface 9, and then is diffused by this second reflecting surface 9 and reflected toward the forward exit surface 10.

[0049] At this time, as shown in Figure 10, the second light L2 is incident on the second reflecting surface 9 in the vertical cross section of the light-guiding lens 4, and then is reflected while being diffused toward the exit surface 10 so that the light ray closer to the optical axis AX passes through the side closer to the focal point S of the projection lens 5.

[0050] As a result, the second light L2 emitted from the emission surface 10 forms a second light distribution pattern P2 that spreads in the direction of the vertical line V on the imaginary vertical screen, as shown in FIG.

[0051] On the other hand, in the vehicle lamp 1 of this embodiment, the third light L3 described above is incident from the incident surface 7 towards the exit surface 10 while being refracted.

[0052] At this time, as shown in FIG. 11, the third light L3 enters the incident surface 7 in the vertical cross section of the light-guiding lens 4, and is then refracted toward the exit surface 10 so that the light ray closer to the optical axis AX passes through the side closer to the focal point S of the projection lens 5.

[0053] As a result, the third light L3 emitted from the exit surface 10 forms a third light distribution pattern P3 that complements the first light distribution pattern P1 and the second light distribution pattern P2, as shown in Figure 8.

[0054] Furthermore, the illumination range of the first, second, and third light distribution patterns P1, P2, and P3 in the direction of the vertical line V (up and down direction) increases in the order of the second light distribution pattern P2, the third light distribution pattern P3, and the first light distribution pattern P1. Meanwhile, the maximum luminous intensity increases in the order of the first light distribution pattern P1, the second light distribution pattern P2, and the third light distribution pattern P3. The bottom ends of the first, second, and third light distribution patterns P1, P2, and P3 are located on approximately the same horizontal line.

[0055] Therefore, as shown in Figures 8 and 12, the light L emitted from the exit surface 10 of the light guiding lens 4 forms a light distribution pattern P with a high luminous intensity on the side of the horizontal line H on the imaginary vertical screen and a wide spread in the direction of the vertical line V due to the superposition of the above-mentioned first, second and third light L1, L2 and L3.

[0056] As described above, the vehicle lamp 1 of this embodiment can improve the utilization efficiency of light L and obtain a good light distribution pattern P. That is, the vehicle lamp 1 improves the luminous intensity near the cutoff line of the low beam light distribution pattern, and can increase the vertical spread of light L projected by the projection lens 5 without causing a shortage of maximum luminous intensity of the high beam light distribution pattern.

[0057] The present invention is not necessarily limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the reflection optical system 40 is not limited to being constituted by a part of the light-guiding lens 4 described above, but can also be constituted by a reflector including a first reflection surface 8 and a second reflection surface 9.

[0058] The present invention can also be suitably used in a vehicle lamp in which light emitted from the light source diagonally upward and forward is reflected by a reflecting surface toward a projection lens in front of the vehicle. [Explanation of symbols]

[0059] DESCRIPTION OF SYMBOLS 1...vehicle lamp 2...lamp cell 3...light source 4...light guide lens 5...projection lens 6...circuit board 7...incident surface 8...first reflecting surface 9...second reflecting surface 10...exiting surface 20...lamp unit 40...reflection optical system L...light L1...first light L2...second light L3...third light P...light distribution pattern P1...first light distribution pattern P2...second light distribution pattern P3...third light distribution pattern S...focus

Claims

1. a light source that emits light radially diagonally upward in front of the vehicle; a projection lens disposed in front of the light source and configured to project the light emitted from the light source toward the front of the vehicle; a reflection optical system disposed between the light source and the projection lens, which reflects the light emitted from the light source toward the projection lens; the reflection optical system has a first reflection surface and a second reflection surface located obliquely above and in front of the light source, the second reflecting surface and the first reflecting surface are arranged side by side in this order toward the front of the light source so that, in a vertical cross section including an optical axis of the light emitted from the light source, light in a central region including the optical axis of the light emitted radially from the light source is incident on the first reflecting surface, and light in peripheral regions above the central region is incident on the second reflecting surface; the first reflecting surface forms an outwardly convex curved surface in the vertical cross section, thereby concentrating the light in the central region and reflecting it toward the projection lens; The second reflective surface forms an inwardly concave curved surface in the vertical cross section, thereby diffusing light from the upper peripheral area and reflecting it toward the projection lens.

2. 2. The vehicular lamp according to claim 1, wherein a light distribution pattern formed by superimposing a first light distribution pattern formed by the light of the central region and a second light distribution pattern formed by the light of the upper peripheral region is projected forward while being inverted upside down by the projection lens.

3. 3. The vehicular lamp according to claim 2, wherein the second light distribution pattern has a larger illumination range in the vertical direction than the first light distribution pattern, and the first light distribution pattern has a higher maximum luminous intensity than the second light distribution pattern.

4. 2. The vehicle lamp according to claim 1, wherein the first reflecting surface and the second reflecting surface form a continuous surface.

5. the reflection optical system is configured as a part of a light guide lens, the light guide lens has an incident surface located on a side facing the light source, the first reflecting surface and the second reflecting surface located diagonally above and in front of the light source, and an exit surface located on a side facing the projection lens, the incident surface allows light emitted from the light source to enter the inside of the light guiding lens, 2. The vehicle lamp according to claim 1, wherein the light exit surface directs light guided inside the light guide lens to the projection lens and then exits the light guide lens to the outside of the light guide lens.

6. The incident surface forms a surface that is inclined obliquely downward toward the front in the vertical cross section, and 6. The vehicle lamp according to claim 5, wherein light from a peripheral region below the central region, among the light radially emitted from the light source, is directed toward the emission surface and enters the inside of the light guide lens.

7. 7. The vehicular lamp according to claim 6, wherein a light distribution pattern obtained by superimposing a first light distribution pattern formed by light in the central region, a second light distribution pattern formed by light in the upper peripheral region, and a third light distribution pattern formed by light in the lower peripheral region is projected forward while being inverted upside down by the projection lens.

8. 8. The vehicular lamp according to claim 7, wherein the illumination range in the vertical direction is larger in the order of the second light distribution pattern, the third light distribution pattern, and the first light distribution pattern, and the maximum luminous intensity is larger in the order of the first light distribution pattern, the second light distribution pattern, and the third light distribution pattern.

9. The light sources are arranged in a line in the width direction of the vehicle, the reflection optical system is disposed corresponding to each of the light sources, 2. The vehicle lamp according to claim 1, wherein a light distribution pattern of the light projected by the projection lens is variably controlled while switching on and off the plurality of light sources.

10. The light sources are arranged in a line in the width direction of the vehicle, the light guide lens has the incident surface, the first reflecting surface, the second reflecting surface, and the exit surface, which are arranged corresponding to each of the light sources; the light exit surface is provided continuously in the width direction of the light guide lens, 6. The vehicle lamp according to claim 5, wherein a light distribution pattern of the light projected by the projection lens is variably controlled while switching on and off the plurality of light sources.

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