Vehicle lighting fixtures

Abstract

This vehicle lighting fixture (100) comprises: a light-guiding unit (110); a plurality of first light-emitting units (120) which are positioned along a first end surface of the light-guiding unit, and which each include a first light source (122) that emits light in a first color and a second light source (124) that emits light in a second color different from the first color; and a controller (140) that controls the plurality of first light-emitting units.

Description

[Technical field]

[0001] The present disclosure relates to a vehicle lamp for use in an automobile or the like. [Background technology]

[0002] Semiconductor light sources such as light-emitting diodes and semiconductor lasers are increasingly being used as light sources for vehicle lighting, replacing conventional light bulbs (bulbs) such as incandescent bulbs. These semiconductor light sources have many advantages over light bulbs, such as greater design diversity when combined with light guides and reduced power consumption.

[0003] Particularly in recent years, vehicle lighting fixtures are being required to have functions to increase the added value of the automobile, such as hospitality lamps, in addition to the functions necessary for the automobile to run. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-92753 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure has been made in light of such a situation, and one exemplary purpose of an embodiment thereof is to provide a vehicle lamp that is capable of switching the color of light emitted and of controlling the size and position of the light-emitting portion. [Means for solving the problem]

[0006] An aspect of the present disclosure relates to a vehicle lamp including a light guide unit, a plurality of first light emitting units arranged along a first end surface of the light guide unit, each of the first light source emitting light in a first color and a second light source emitting light in a second color different from the first color, and a controller controlling the plurality of first light emitting units.

[0007] Any combination of the above components, or mutual substitution of the components or expressions of the present disclosure between methods, devices, systems, etc., are also valid aspects of the present disclosure. Effect of the Invention

[0008] According to one aspect of the present disclosure, the color of emitted light can be switched, and the position and size of the light-emitting portion can be controlled. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing a vehicle lamp according to an embodiment; [Diagram 2] 2(a) to (d) are diagrams showing exemplary light emission modes of a vehicle lamp. [Diagram 3] 3(a) and (b) are diagrams illustrating an example of transition of a lighting pattern of a vehicle lamp. [Figure 4] 4(a) and (b) are time charts corresponding to the transitions in FIGS. 3(a) and (b). [Diagram 5] 5(a) and (b) are diagrams illustrating the movement of the light emitting region in the Y direction. [Figure 6] 6(a) and (b) are time charts corresponding to the transitions in FIGS. 5(a) and (b). [Figure 7] FIG. 11 is a diagram showing an example of a transition from a light emitting state of a first color to a light emitting state of a second color. [Figure 8] 8 is a time chart corresponding to the transition in FIG. 7. [Figure 9] FIG. 1 is a diagram showing a front grille equipped with vehicle lamps. [Figure 10] FIG. 11 is a diagram showing a vehicle lamp according to a second embodiment. [Figure 11] FIG. 2 is a cross-sectional view of a vehicle lamp. [Figure 12] FIG. 11 is a diagram showing a vehicle lamp according to a third embodiment. [Figure 13] FIG. 1 is a diagram showing a headlamp equipped with a vehicle lighting device. [Figure 14]FIG. 1 is a diagram showing a rear combination lamp equipped with a vehicle lamp. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Overview of the embodiment) A summary of some exemplary embodiments of the present disclosure will be described. This summary is intended to provide a simplified summary of some concepts of one or more embodiments in order to provide a basic understanding of the embodiments as a prelude to the detailed description that follows, and is not intended to limit the scope of the invention or disclosure. Furthermore, this summary is not intended to be a comprehensive overview of all possible embodiments, nor is it intended to limit essential components of the embodiments. For convenience, the term "one embodiment" may be used to refer to one embodiment (example or variant) or multiple embodiments (examples or variants) disclosed in this specification.

[0011] A vehicle lamp according to one embodiment includes a light-guiding unit, a plurality of first light-emitting units arranged along a first end surface of the light-guiding unit, each of the first light source emitting light in a first color and a second light source emitting light in a second color different from the first color, and a controller that controls the plurality of first light-emitting units.

[0012] According to this configuration, the emitted color can be switched, and the size and position of the light-emitting portion of the light guide unit can be controlled.

[0013] In one embodiment, the vehicle lamp may further include a plurality of second light-emitting units arranged along a second end face opposite to the first end face of the light-guiding unit, each of which includes a third light source that emits light in a first color and a fourth light source that emits light in a second color. This can reduce unevenness in brightness in the light-guiding direction. In addition, it is possible to control the position and size of the light-emitting portion in the light-guiding direction.

[0014] In one embodiment, the light guide unit may include a plurality of light guides corresponding to the plurality of first light emitting units and the plurality of second light emitting units, each extending from a corresponding one of the plurality of first light emitting units to a corresponding one of the plurality of second light emitting units, thereby confining light in the light guide for each pair of the first light emitting unit and the second light emitting unit, and clarifying the boundary of the light emitting portion for each pair of light emitting units.

[0015] In one embodiment, the light guides may have a plurality of discrete steps formed in the extending direction thereof, whereby a plurality of light emitting portions can be arranged in a matrix.

[0016] In one embodiment, the light guide unit may be a single light guide panel, and a collimating optical system for each of the first light emitting units may be provided or formed on a first end surface of the light guide panel, and a collimating optical system for each of the second light emitting units may be provided or formed on a second end surface of the light guide panel.

[0017] In one embodiment, the light guide panel may have a plurality of discrete steps formed in the light guide direction, and the plurality of steps may be formed discretely with respect to the arrangement direction of the plurality of first light emitting units.

[0018] In one embodiment, the controller may (i) cause a first light source to emit light in the plurality of first light-emitting units and cause a third light source to emit light in the plurality of second light-emitting units; (ii) gradually dim the first light source over time and gradually increase the brightness of the second light source over time in the plurality of first light-emitting units; and (iii) gradually dim the third light source over time and gradually increase the brightness of the fourth light source over time in the plurality of second light-emitting units.

[0019] This allows the emission state to be changed over time along the light guide direction when switching from an emission state of the first color to an emission state of the second color.

[0020] In one embodiment, one of the first and second colors may be turquoise, which can be used as a light to indicate that the vehicle is in autonomous driving mode.

[0021] In one embodiment, one of the first and second colors may be white, which can be used as a Daytime Running Lamp (DRL), a position lamp (clearance lamp), or a hospitality lamp.

[0022] In one embodiment, one of the first and second colors may be red or amber, allowing it to be used as a stop lamp or a turn lamp.

[0023] In one embodiment, the vehicle lamp may be mounted on a front grille of a vehicle, the vehicle lamp may be mounted on a headlamp or a rear combination lamp, or the vehicle lamp may be an interior lamp.

[0024] (Embodiment) Hereinafter, the present disclosure will be described with reference to the drawings based on preferred embodiments. The same or equivalent components, parts, and processes shown in each drawing will be given the same reference numerals, and duplicated descriptions will be omitted as appropriate. In addition, the embodiments are not intended to limit the disclosure, but are merely examples, and all features and combinations thereof described in the embodiments are not necessarily essential to the disclosure.

[0025] (Embodiment 1) 1 is a diagram showing a vehicle lamp 100 according to an embodiment. The vehicle lamp 100 includes a light guide unit 110, a plurality (N pieces) of first light-emitting units 120_1 to 120_N, a plurality (N pieces) of second light-emitting units 130_1 to 130_N, and a controller 140.

[0026] The plurality of first light emitting units 120_1 to 120_N are disposed along the first end surface S1 of the light guide unit 110. The first light emitting unit 120 includes a first light source 122 that emits light in a first color and a second light source 124 that emits light in a second color different from the first color. The first light source 122 and the second light source 124 may be semiconductor light emitting elements such as LEDs (light emitting diodes), LDs (laser diodes), and organic ELs (electro luminescence). The first light emitting unit 120 includes, in addition to the first light source 122 and the second light source 124, lighting circuits (drive circuits) for them. The configuration of the lighting circuits may be designed according to the type of light source.

[0027] The multiple second light-emitting units 130_1-130_N are arranged in the X direction along a second end surface S2 opposite to the first end surface S1 of the light-guiding unit 110. Similar to the first light-emitting unit 120, the second light-emitting unit 130 includes a third light source 132 that emits light in a first color and a fourth light source 134 that emits light in a second color.

[0028] Each of the first light-emitting units 120 is positioned such that the emitted light L1, L2 from the first light source 122 and the second light source 124 is incident on a first end surface S1 of the light-guiding unit 110. Similarly, each of the second light-emitting units 130 is positioned such that the emitted light L3, L4 from the third light source 132 and the fourth light source 134 is incident on a second end surface S2 of the light-guiding unit 110.

[0029] The emitted lights L1 and L2 from the first light source 122 and the second light source 124 of the first light-emitting unit 120 are guided in the light-guiding unit 110 in a direction (Y direction) substantially perpendicular to the first end face S1. The emitted lights L3 and L4 from the third light source 132 and the fourth light source 134 of the second light-emitting unit 130 are guided in the light-guiding unit 110 in a direction (Y direction) substantially perpendicular to the second end face S2, opposite to the direction of the lights L1 and L2.

[0030] The first color and the second color are not particularly limited and may be determined according to the application of the vehicle lamp 100. For example, the first color may be white and the second color may be turquoise. In this embodiment, the first light source 122 and the second light source 124 in the first light-emitting unit 120 are lighted complementarily, and similarly, the third light source 132 and the fourth light source 134 in the second light-emitting unit 130 are lighted complementarily.

[0031] The controller 140 controls the plurality of first light emitting units 120_1 to 120_N and the plurality of second light emitting units 130_1 to 130_N. Specifically, the controller 140 is configured to be able to control the on / off and light amount of the plurality of light sources 122, 124, 132, 134 independently.

[0032] In the present embodiment, the light guide unit 110 includes N light guides 112_1 to 112_N. The N light guides 112_1 to 112_N correspond to the N first light emitting units 120 and second light emitting units 130. The i-th light guide 112_i guides the emitted light of the corresponding first light emitting unit 120_i and the emitted light of the corresponding second light emitting unit 130_i. In other words, the i-th light guide 112_i extends from the corresponding first light emitting unit 120_i toward the corresponding second light emitting unit 130_i.

[0033] Each of the N light guides 112_1 to 112_N has a plurality of M steps (rough surfaces or lens arrays) 114_1 to 114_M formed thereon in the extending direction (Y direction) of the light guides 112. In the example of Fig. 1, the number of steps M is equal to 5 for all the light guides 112, but the number of steps M may be different for each light guide 112.

[0034] In the vehicular lamp 100 of FIG. 1, a plurality of steps 114 are arranged in a matrix of M rows and N columns, forming independent light-emitting regions.

[0035] The above is the configuration of the vehicular lamp 100. Next, the operation will be described.

[0036] 2(a) to (d) are diagrams showing exemplary light emission modes of the vehicle lamp 100. Here, M=4 and N=6 are shown.

[0037] 2(a), all the light-emitting regions in M ​​rows and N columns are lit in the first color. The controller 140 has the first light sources 122 in all the first light-emitting units 120 in an lit state and the second light sources 124 in an extinguished state, and has the third light sources 132 in all the second light-emitting units 130 in an lit state and the fourth light sources 134 in an extinguished state.

[0038] 2(b), all of the light-emitting regions in M ​​rows and N columns are lit in the second color. The controller 140 has the second light source 124 in all of the first light-emitting units 120 in an on state and the first light source 122 in an off state, and has the fourth light source 134 in all of the second light-emitting units 130 in an on state and the third light source 132 in an off state.

[0039] In Fig. 2(c), the light-emitting regions in some columns (the third and fourth columns) among the N columns emit light in the first color. In the third and fourth columns, the controller 140 turns on the first light source 122 and the third light source 132 and turns off the second light source 124 and the fourth light source 134. The remaining light-emitting units 120_1, 120_2, 120_5, 120_6, 130_1, 130_2, 130_5, and 130_6 in the first, second, fifth, and sixth columns are turned off.

[0040] In the same manner, it is possible to make the light emitting regions of some of the N columns emit light in a second color.

[0041] In Fig. 2(d), the light emitting areas in some of the N columns (the first column, the fourth column to the sixth column) emit light in a first color, and the light emitting areas in the remaining columns (the second column and the third column) emit light in a second color. In the first column and the fourth column to the sixth column, the controller 140 sets the first light source 122 and the third light source 132 to an on state, and the second light source 124 and the fourth light source 134 to an off state. In the third and fourth columns, the controller 140 sets the first light source 122 and the third light source 132 to an off state, and the second light source 124 and the fourth light source 134 to an on state.

[0042] In this way, the states (color and on / off) of the multiple light-emitting regions can be controlled independently for each row according to the vehicle lamp 100. Hereinafter, a combination of the states of the multiple light-emitting regions is referred to as a lighting pattern.

[0043] The vehicular lamp 100 can also produce animation (movement) by changing the lighting pattern over time. Figures 3(a) and 3(b) are diagrams illustrating an example of the transition of the lighting pattern by the vehicular lamp 100.

[0044] In Fig. 3(a), the light-emitting area of ​​the first color moves from right to left in the figure, while Fig. 3(b) shows sequential lighting, starting from the leftmost column.

[0045] 4(a) and (b) are time charts corresponding to the transitions in FIG. 3(a) and (b). The on and off states of the first light source 122 and the third light source 132 in the i-th column are denoted as 122_i and 132_i.

[0046] The light-emitting areas shown as being in an unlit state in FIGS. 3(a) and (b) can also be lit up in a second color.

[0047] Although the movement of the light emitting region in the X direction has been described with reference to FIGS. 3(a) and 3(b) and 4(a) and 4(b), the vehicle lamp 100 can also move the light emitting region in the Y direction.

[0048] Figures 5(a) and (b) are diagrams for explaining the movement of the light emitting region in the Y direction. Figures 6(a) and (b) are time charts corresponding to the transitions in Figures 5(a) and (b).

[0049] FIG. 5(a) shows a transition from a first state φ1 in which the upper half of the light-emitting region is lit to a second state φ2 in which the lower half of the light-emitting region is lit. As shown in FIG. 6(a), in the first state φ1, the first light sources 122_1-122_6 of the multiple first light-emitting units 120 are lit, and the multiple second light-emitting units 130 are turned off. The emitted light from the first light sources 122_1-122_6 is guided downward within the light-guiding unit 110, but since the light attenuates as the distance from the light source increases, the brightness of the lower region is lower than the brightness of the upper region. In other words, it appears that only the upper half is lit.

[0050] In the second state φ2, the third light sources 132_1 to 132_6 of the multiple second light-emitting units 130 are turned on, and the multiple first light-emitting units 120 are turned off. The emitted light from the third light sources 132_1 to 132_6 is guided upward in the light-guiding unit 110, but since the light attenuates as the distance from the light source increases, the brightness of the upper region is lower than the brightness of the lower region. In other words, it appears that only the lower half is turned on.

[0051] The plurality of first light-emitting units 120 are turned off, and the third light sources 132 of the plurality of second light-emitting units 130 are turned on.

[0052] Fig. 5(b) shows a gradual transition from the first state φ1 to the second state φ2. This transition can be achieved by the control shown in Fig. 6(b). In the control shown in Fig. 6(b), the luminance of the first light source 122 and the third light source 132 can be continuously controlled.

[0053] Fig. 7 is a diagram showing an example of a transition from a light emitting state of a first color to a light emitting state of a second color, and Fig. 8 is a time chart corresponding to the transition in Fig. 7.

[0054] First, the controller 140 (i) causes the first light sources 122_1 to 122_6 in the plurality of first light-emitting units 120 to emit light, and causes the third light sources 132_1 to 132_6 in the plurality of second light-emitting units 130 to emit light. In this state, as shown in (i) of FIG. 7, the entire panel emits light in the first color.

[0055] The controller 140(ii) gradually reduces the brightness of the first light sources 122_1-122_6 in the plurality of first light-emitting units 120_1-120_6 over time, and simultaneously gradually increases the brightness of the second light sources 124_1-124_6 over time. As a result, as shown in (ii) of FIG. 7, the upper half of the panel changes from the first color to the second color.

[0056] Furthermore, the controller 140 (iii) gradually reduces the brightness of the third light sources 132_1-132_6 over time in the plurality of second light-emitting units 130_1-130_6, and simultaneously gradually increases the brightness of the fourth light sources 134_1-134_6 over time. This causes the lower half of the panel to transition from the first color to the second color, and finally, as shown in (iii) of FIG. 7, the entire panel becomes the second color.

[0057] Next, a description will be given of applications of the vehicular lamp 100. The vehicular lamp 100 may be mounted on the front grille of an automobile.

[0058] 9 is a diagram showing a front grille 700 including a vehicle lamp 100. The light guide unit 110 includes a plurality of light guides 112 arranged in the horizontal direction. A first light emitting unit 120 (not shown) is provided on the upper end surface of each light guide 112, and a second light emitting unit 130 (not shown) is provided on the lower end surface.

[0059] In this front grille 700, the first color can be white and the second color can be turquoise. The white color can function as a DRL, clearance lamp, or hospitality lamp. When a vehicle equipped with the front grille 700 is traveling in an autonomous driving mode, the front grille 700 can be illuminated in turquoise to inform surrounding traffic participants that the vehicle is in an autonomous driving mode.

[0060] The shape of the plurality of light-emitting regions of the vehicle lamp 100 is not limited to a rectangle, and may be a parallelogram as shown in Fig. 9, or may be a polygon such as a triangle, a pentagon, a hexagon, or an octagon, or may be a circle, an ellipse, or other shapes. The shape of the light-emitting region may be designed according to the shape of a step provided in the light guide 112. Alternatively, a rectangular step may be formed, and the surface of the light guide unit 110 may be covered with an extension or a mask in which the light-emitting region portion is hollowed out.

[0061] In the first embodiment, when the height of light guide unit 110 is short, the second light-emitting units 130 may be omitted.

[0062] (Embodiment 2) 10 is a diagram showing a vehicular lamp 200 according to embodiment 2. The basic structure of the vehicular lamp 200 is similar to that of the vehicular lamp 100 according to embodiment 1, and includes a light guide unit 210, a plurality of first light emitting units 220, and a plurality of second light emitting units 230.

[0063] As in the first embodiment, the light guide unit 210 includes a plurality of light guide bodies 212 corresponding to a plurality of first light emitting units 220 and a plurality of second light emitting units 230 .

[0064] In the second embodiment, each light guide 212 has a structure in which a plurality of light guide plates 214a to 214c (three in FIG. 10) are laminated in the thickness direction.

[0065] The first light emitting unit 220 has a pair of a first light source 222# and a second light source 224# for each light guide plate 214# (#=a to c). Similarly, the second light emitting unit 230 has a pair of a third light source 232# and a fourth light source 234# for each light guide plate 214#.

[0066] The controller 240 can independently control the turning on and off of the first light sources 222a-222c and the second light sources 224a-224c for each of the first light-emitting units 220. Similarly, the controller 240 can independently control the turning on and off of the third light sources 232a-232c and the fourth light sources 234a-234c for each of the second light-emitting units 230.

[0067] 11 is a cross-sectional view of the vehicle lamp 200. Steps 216a to 216c are formed at different heights on the light guide plates 214a1 to 214c, respectively. When the second light source 224 and the fourth light source 234 corresponding to the light guide plate 214_i are turned on, the steps provided on the light guide plate 214_i emit light in a second color. When the first light source 222 and the third light source 232 corresponding to the light guide plate 214_i are turned on, the steps provided on the light guide plate 214_i emit light in a first color.

[0068] The above is the configuration of the vehicular lamp 200. According to this vehicular lamp 200, in each first light-emitting unit 220, by controlling the turning on and off of the plurality of first light sources 222a-222c (232a-232c) and the plurality of second light sources 224a-224c (234a-234c), it is possible to select which step height is to be illuminated.

[0069] (Embodiment 3) 12 is a diagram showing a vehicle lamp 300 according to embodiment 3. The vehicle lamp 300 includes a light guide unit 310, a plurality of first light emitting units 320, a plurality of second light emitting units 330, and a controller 340. In embodiment 3, the light guide unit 310 is composed of one light guide panel 312.

[0070] The light guide panel 312 is formed with a plurality of steps arranged in a matrix. A collimating optical system 314 is provided for each of the first light emitting units 320 on the first end surface S1 side of the light guide unit 310. The collimating optical system may be formed integrally with the light guide unit 310. As shown in FIG. 12, when the light guide unit 310 is a single panel, in other words, when the beams of adjacent light emitting units are guided in the same light guide, the collimating optical system 314 may be provided to restrict the guide path of each beam. The collimating optical system 314_i converts the emitted light of the corresponding first light emitting unit 320_i into parallel light (plane wave), suppresses beam spread, and guides the light in the light guide unit 310 in the height direction (Y direction). As shown in Figures 1 and 10, when the light-guiding unit 110 (210) is formed separately as multiple light-guiding bodies 112 (212), the beam is confined within each light-guiding unit, so that a collimating optical system may be provided or may be omitted.

[0071] Similarly, a collimating optical system 316 is provided for each second light-emitting unit 330 on the second end surface S2 side of the light-guiding unit 310. The collimating optical system 316_i converts the emitted light of the corresponding second light-emitting unit 330_i into parallel light (plane wave), suppresses spreading, and guides the light within the light-guiding unit 310.

[0072] The collimating optical systems 314 and 316 may be convex members provided on the first end surface S1 and the second end surface S2 of the light guide unit 310.

[0073] By appropriately designing the collimating optical systems 314 and 316, it is possible to guide the emitted light from the multiple first light-emitting units 320 within the light-guiding panel 312 without interference.

[0074] In the vehicle lamp 300 of FIG. 12, the plurality of second light emitting units 330 and the plurality of collimating optical systems 316 may be omitted.

[0075] Next, a description will be given of the use of the vehicle lamp 300. Fig. 13 is a diagram showing a headlamp 800 equipped with the vehicle lamp 300. The headlamp 800 is equipped with a low beam 802, a high beam 804, a clearance lamp 806, and a turn lamp / ADS lamp 810. The clearance lamp 806 may also function as a DRL.

[0076] The turn lamp / ADS (Automated Driving System) lamp 810 is a vehicle lamp 300 that emits amber light when functioning as a turn lamp and emits turquoise light when functioning as an ADS lamp. Therefore, the vehicle lamp 300 is designed with a first color being amber and a second color being turquoise.

[0077] In Fig. 13, continuous steps may be formed over the entire surface of light guide panel 312. Alternatively, steps may be formed in a matrix as shown in Fig. 12. Alternatively, steps may be formed in one row and N columns.

[0078] 14 is a diagram showing a rear combination lamp 900 equipped with a vehicle lamp 300. The rear combination lamp 900 is equipped with a tail lamp / ADS lamp 910 and a turn lamp / ADS lamp 920.

[0079] The tail lamp / ADS lamp 910 and the turn lamp / ADS lamp 920 are the vehicle lamp 300 in Fig. 12. The tail lamp / ADS lamp 910 emits red light when functioning as a tail lamp, and emits amber light when functioning as an ADS lamp. Therefore, the first color is designed to be red and the second color is designed to be turquoise.

[0080] The turn lamp / ADS lamp 920 emits amber light when functioning as a turn lamp, and emits turquoise light when functioning as an ADS lamp, and is therefore designed with a first color being amber and a second color being turquoise.

[0081] The present disclosure has been described using specific terms based on the embodiments, but the embodiments merely illustrate the principles and applications of the present disclosure, and many modifications and changes in arrangement are permitted to the embodiments as long as they do not deviate from the concept of the present disclosure defined in the claims. [Industrial Applicability]

[0082] The present disclosure can be used in vehicle lighting fixtures. [Explanation of symbols]

[0083] 100...vehicle lamp, 110...light guide unit, S1...first end surface, S2...second end surface, 112...light guide, 120...first light emitting unit, 122...first light source, 124...second light source, 130...second light emitting unit, 132...third light source, 134...fourth light source, 140...controller, 200...vehicle lamp, 210...light guide unit, 212...light guide, 214...light guide plate, 220...first light emitting unit, 222...first light source, 224...second light source, 230...second light emitting unit, 232...third light source, 23 4...fourth light source, 300...vehicle lamp, 310...light guide unit, S1...first end surface, S2...second end surface, 312...light guide panel, 314, 316...collimating optical system, 320...first light-emitting unit, 322...first light source, 324...second light source, 330...second light-emitting unit, 332...third light source, 334...fourth light source, 700...front grille, 800...headlamp, 900...rear combination lamp, 910...tail lamp and ADS lamp, 920...turn lamp and ADS lamp.

Claims

1. A light guide unit; a plurality of first light emitting units arranged along a first end surface of the light guide unit, each of the first light emitting units including a first light source that emits light in a first color and a second light source that emits light in a second color different from the first color; a controller that controls the color of light emitted by the light guide unit and the size and position of a light emitting portion of the light guide unit by independently controlling the plurality of first light emitting units; a plurality of second light emitting units arranged along a second end surface of the light guide unit opposite to the first end surface, each of the second light emitting units including a third light source that emits light in the first color and a fourth light source that emits light in the second color; Equipped with the controller (i) causes the first light source in the plurality of first light-emitting units to emit light and causes the third light source in the plurality of second light-emitting units to emit light; (ii) in the plurality of first light-emitting units, gradually dims the first light source over time while gradually increases the brightness of the second light source over time; and (iii) in the plurality of second light-emitting units, gradually dims the third light source over time while gradually increases the brightness of a fourth light source over time.

2. 2. The vehicle lamp according to claim 1, wherein the light guide unit includes a plurality of light guides corresponding to the plurality of first light emitting units, each of the light guides extending from a corresponding one of the plurality of first light emitting units as a starting point.

3. 2. The vehicle lamp according to claim 1, wherein the light guide unit includes a plurality of light guides corresponding to the plurality of first light-emitting units and the plurality of second light-emitting units, each of the light guides extending from a corresponding one of the plurality of first light-emitting units to a corresponding one of the plurality of second light-emitting units.

4. 4. The vehicular lamp according to claim 2, wherein a plurality of discrete steps are formed in each of the light guides in an extending direction.

5. the light guide unit is a light guide panel; 2. The vehicle lamp according to claim 1, wherein a collimating optical system is provided or formed on the first end surface of the light guide panel for each of the first light emitting units.

6. The light guide unit has a laminated structure, Each layer of the stack has a step at a different height; The vehicle lamp according to claim 1 , wherein the first light emitting unit includes a pair of the first light source and the second light source for each layer of a laminated structure.

7. 7. The vehicular lamp according to claim 1, wherein one of the first color and the second color is turquoise.

8. 8. The vehicular lamp according to claim 1, which is mounted on a front grille of a vehicle.

9. 8. The vehicular lamp according to claim 1, which is mounted in a headlamp or a rear combination lamp.

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