JP2020009657A - Vehicular lighting fixture - Google Patents

Abstract

To enhance light utilization efficiency in a vehicular lighting fixture.SOLUTION: A vehicular lighting fixture includes: a light source 4; and a light guide body 6 which has a bar-like part 8 and a plate-like part 10 having a light diffusion material inside. In the light guide body 6, a peripheral surface 8c of the bar-like part 8 is connected to a side surface of the plate-like part 10, and the light guide body has a shape in which the connection position between the peripheral surface 8c and the side surface of the plate-like part 10 is deviated in the shaft peripheral direction of the bar-like part 8 in a predetermined first portion and in a second portion separated further from the light source 4 than the first portion. The light from the light source 4 enters the bar-like part 8 from an end part of the bar-like part 8, enters the plate-like part 10 from the peripheral surface 8c of the bar-like part 8, and is emitted from a main surface of the plate-like part 10 by the light diffusion material.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vehicle lamp, and more particularly to a vehicle lamp used for a vehicle such as an automobile.

  2. Description of the Related Art Conventionally, there is known a vehicular lamp that emits light from a light source to a front of the lamp via a light guide. For example, in Patent Literature 1, light is incident on a plate-shaped light guide from a side surface, reflected by a reflective element such as a step provided on a main surface inside the lamp, and light is emitted from the main surface outside the lamp to the front of the lamp. A vehicular lamp having an emission structure is disclosed.

JP 2014-116142 A

  The inventor of the present invention has earnestly studied the above-described conventional vehicle lamp, and as a result, has come to recognize that there is room for improving the light use efficiency of the conventional vehicle lamp.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique for increasing the light use efficiency of a vehicle lamp.

  In order to solve the above problems, one embodiment of the present invention is a vehicular lamp. The vehicular lamp includes a light source, a rod-shaped portion, and a light guide having a plate-shaped portion containing a light diffusing material therein. In the light guide, the peripheral surface of the rod-shaped portion is connected to the side surface of the plate-shaped portion, and the connection position of the peripheral surface and the side surface is a predetermined first region and a second region farther from the light source than the first region. Has a shape displaced in the direction around the axis of the rod portion. Light from the light source is incident on the rod from the end of the rod, enters the plate from the peripheral surface of the rod, and is emitted from the main surface of the plate by the light diffusing material. According to this aspect, the light emission of the light guide can be visually recognized from more directions.

  In the above aspect, the connection position may be continuously shifted from the first portion to the second portion. Further, in any of the above aspects, the first portion may include one end of the plate portion, and the second portion may include the other end of the plate portion. In the above aspect, the connection positions may be shifted in the same direction around the axis.

  Note that any combination of the above-described components and any conversion of the expression of the present invention between a method, an apparatus, a system, and the like are also effective as aspects of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the utilization efficiency of the light in a vehicle lamp can be improved.

It is a perspective view of the vehicular lamp concerning an embodiment. It is a front view showing the internal structure of the vehicular lamp concerning an embodiment. FIG. 3 is a sectional view taken along line AA of FIG. 2. FIGS. 4A and 4B are schematic diagrams for explaining a method for measuring the light emission efficiency of the plate-like portion. It is a front view of a light source and a light guide. It is a rear view of a light source and a light guide. It is a left view of a light source and a light guide. It is a right view of a light source and a light guide. FIG. 9A is a cross-sectional view along the line BB of FIG. FIG. 9B is a cross-sectional view along the line CC of FIG.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The embodiments are illustrative and do not limit the invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention. The same or equivalent components, members, and processes shown in each drawing are denoted by the same reference numerals, and the repeated description will be omitted as appropriate. Further, the scale and shape of each part shown in each drawing are set for the sake of convenience for ease of explanation, and are not to be construed as limiting unless otherwise specified. In addition, when terms such as “first” and “second” are used in the present specification or claims, the terms do not indicate any order or importance unless otherwise specified, and a certain configuration may be used. This is for distinguishing the configuration from other configurations. In each drawing, some members that are not important for describing the embodiments are omitted.

  FIG. 1 is a perspective view of the vehicle lamp according to the embodiment. FIG. 2 is a front view showing the internal structure of the vehicular lamp according to the embodiment. FIG. 3 is a sectional view taken along line AA of FIG. The vehicle lamp 1 is, for example, a rear combination lamp arranged behind the vehicle. In this embodiment, for convenience of explanation, the front-rear direction of the lamp and the front-rear direction of the vehicle body on which the vehicle lamp 1 is mounted are set to the same direction, and the left-right direction of the lamp is set to the same direction as the vehicle width direction of the vehicle body. The right side in FIGS. 1 and 2 is defined as the outside in the vehicle width direction.

  The vehicular lamp 1 includes a lamp body 2 and a translucent outer cover (not shown) that covers the lamp body 2 on the front side of the lamp. The light source 4 and the light guide 6 are accommodated in a lamp room formed by the lamp body 2 and the outer cover. The light source 4 and the light guide 6 are respectively fixed to the lamp body 2.

  The light source 4 is, for example, an LED (light emitting diode). The light source 4 may be another semiconductor light emitting element such as an LD (laser diode), an organic or inorganic EL (electroluminescence), an incandescent bulb, a halogen lamp, a discharge bulb, or the like. In the present embodiment, two light sources 4a and 4b are provided for one light guide 6. Hereinafter, when it is not necessary to distinguish the light source 4a and the light source 4b, these are collectively referred to as a light source 4.

  The light guide 6 is a resin member having a light transmitting property. Examples of the resin used for the light guide 6 include a transparent thermoplastic resin or a thermosetting resin such as a polycarbonate resin and an acrylic resin. In the present embodiment, a plurality of light guides 6 are arranged in the vehicle width direction. In addition, the plurality of light guides 6 are arranged such that the light guides 6 are arranged closer to the outside in the vehicle width direction so as to be shifted rearward from the lamp.

  Each light guide 6 has a rod-shaped portion 8 and a plate-shaped portion 10. The rod-shaped portion 8 is a long portion extending in any one direction. The rod-shaped portion 8 of the present embodiment has a columnar shape and extends in a substantially vertical direction. However, as for the light guide 6, the rod-shaped portion 8 is slanted toward the inside in the vehicle width direction. The front of the plurality of light guides 6 is gradually directed to the side of the vehicle body as going outward in the vehicle width direction. In other words, the posture of each light guide 6 is determined so as to gradually rotate around the extension axis (center axis in the extension direction) of the rod-shaped portion 8 toward the outside in the vehicle width direction.

  The light source 4 is disposed at an end of the rod-shaped portion 8. In the present embodiment, the light source 4a is arranged at one end of the rod-shaped portion 8, and the light source 4b is arranged at the other end. Each light source 4 is arranged so that its light emitting surface faces the end surface of the rod-shaped portion 8. Therefore, the light from each light source 4 enters the light guide 6 from the end face of the rod-shaped portion 8. The end face is a surface extending in a direction intersecting with the stretching axis at the end of the rod-shaped member.

  The plate portion 10 protrudes from the peripheral surface of the rod portion 8. The peripheral surface is a surface extending along the stretching axis of the rod-shaped member. The plate-shaped part 10 is connected to the rod-shaped part 8 at an intermediate portion excluding both ends of the rod-shaped part 8. Both end portions of the rod portion 8 and the light source 4 disposed close to each end portion are hidden from the outside of the lamp by the lamp body 2. Further, the rod portion 8 is inserted into a through hole 2 a provided in the lamp body 2. An intermediate portion connecting both end portions of the rod portion 8 and the plate portion 10 are exposed to the outside of the lamp body 2.

  The plate-shaped part 10 has a first main surface 10a and a second main surface 10b that are opposed to each other. Further, the plate-shaped portion 10 has a plurality of side surfaces connecting the first main surface 10a and the second main surface 10b. The shape of the light guide 6 will be described later in detail.

  As shown in the enlarged view of the dashed region R in FIG. 3, the plate portion 10 contains a light diffusing material 11 inside. Examples of the light diffusing material 11 include metal oxide particles, for example, titanium dioxide particles. The average particle size of the titanium dioxide particles is, for example, 150 to 500 nm, preferably 160 to 450 nm, more preferably 170 to 450 nm, further preferably 200 to 400 nm, and particularly preferably 220 to 400 nm. The content of the light diffusing material 11 is, for example, 0.1 to 100 ppm by mass, preferably 0.1 to 50 ppm by mass, and more preferably 0.1 to 10 ppm by mass with respect to the entire mass of the plate-shaped portion 10. .

  The titanium dioxide particles have a rutile transformation ratio of, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, and further preferably 90% by mass or more. The plate-shaped portion 10 includes other monomers copolymerizable with the main monomer of the resin used, an antistatic agent, an antioxidant, a release agent, a flame retardant, a lubricant, a fluidity improver, a filler, General additives such as stabilizers may be included. Note that the content of the light diffusing material 11 in the rod portion 8 is smaller than the content in the plate portion 10, and the rod portion 8 of the present embodiment does not contain the light diffusing material 11.

  The material constituting the plate-shaped portion 10 has a haze value in a thickness direction of at least a part of more than 7% and 30% or less when measured as a flat plate having a thickness of 4 mm. The material constituting the rod-shaped portion 8 has a haze value of 7% or less when measured under the same conditions. The material constituting the plate-shaped portion 10 is, when measured as a flat plate having a thickness of 4 mm, the transmittance of visible light in at least a part of the plate thickness direction (in the normal direction of one main surface, the main surface is not included). (The ratio of the amount of light emitted in all directions from the other main surface to the amount of light incident from the other main surface) is 60% or more and 92% or less.

  The haze value of the plate-shaped portion 10 and the rod-shaped portion 8 can be measured using a haze meter HZ-2 (manufactured by Suga Test Instruments Co., Ltd.) in accordance with JIS K7136. The visible light transmittance of the plate portion 10 can be measured using a haze meter HZ-2 (manufactured by Suga Test Instruments Co., Ltd.) in accordance with JIS K7361-1.

  Further, in a flat plate made of a material constituting the plate-shaped portion 10 (hereinafter, for convenience, this flat plate is referred to as the plate-shaped portion 10), light incident from a side surface connecting two main surfaces is emitted from the main surface. In this case, the following conditions are satisfied for the emission efficiency. FIGS. 4A and 4B are schematic diagrams for explaining a method for measuring the light emission efficiency of the plate-like portion. FIG. 4A shows the dimensions of the plate portion 10 and the arrangement of the LEDs. FIG. 4B shows a state where the plate-shaped portion 10 to which the fixed frame B is attached is viewed from the light emitting surface C side.

  As shown in FIG. 4A, a rectangular parallelepiped plate-shaped portion 10 having a vertical length of 100 mm, a horizontal length of 190 mm, and a thickness of 3.2 mm is prepared. The side surface A of the plate portion 10 is defined as a light source light incident surface. Then, the LEDs are arranged in the normal direction of the side surface A. The LEDs are arranged such that the focal point P faces the side A and the distance from the focal point P to the side A is 1.85 mm. Light is diffused from the light emitting surface of the LED in a range of 180 °.

  Further, as shown in FIG. 4B, the periphery of the prepared plate-shaped portion 10 is covered with a fixed frame B. In the state covered with the fixed frame B, the light emitting surface C of the plate-shaped portion 10 has a vertical length of 90 mm and a horizontal length of 160 mm. The fixed frame B does not reflect light on both the front surface and the back surface. Further, a light receiving surface (not shown) is disposed at a distance of $ 10 from the light emitting surface C in the normal direction of the light emitting surface C.

  In this state, light is emitted from the LED. Then, the luminous flux of the light applied to a rectangular area of 15 ° vertically and 25 ° left and right on the light receiving surface is measured around the intersection of the normal passing through the center of the light emitting surface C and the light receiving surface. In the case of the plate-shaped portion 10, the luminous flux of light applied to the rectangular area is 0.3% or more when the luminous flux of light emitted from the LED is set to 1.

  Further, when light is incident from the side surface, the plate-shaped portion 10 emits light per unit area from the main surface more than output light per unit area from the side opposite to the light incident side. When light enters from one of the main surfaces, there is an optical characteristic that the amount of light emitted from the other main surface per unit area is larger than the amount of light emitted from the side surface per unit area.

  That is, the ratio of the light emitted from the main surface is emitted from the side surface, regardless of whether the light is incident from the side surface or the case where the light is incident from the main surface. Higher than the percentage of light. However, a predetermined amount of light is emitted from the side surface of the plate-shaped portion 10. Therefore, when any one side surface of the plate-shaped portion 10 is set as the light incident surface, the two main surfaces and the other side surface are visually recognized as the light emitting portion.

  Subsequently, the shape of the light guide 6 will be described in detail. FIG. 5 is a front view of the light source and the light guide. FIG. 6 is a rear view of the light source and the light guide. FIG. 7 is a left side view of the light source and the light guide. FIG. 8 is a right side view of the light source and the light guide. FIG. 9A is a cross-sectional view along the line BB of FIG. FIG. 9B is a cross-sectional view along the line CC of FIG.

  The rod-shaped portion 8 has a first end face 8a located on the upper side in the vertical direction, a second end face 8b located on the lower side in the vertical direction, and a peripheral face 8c connecting the first end face 8a and the second end face 8b. The light source 4a is arranged at a position facing the first end surface 8a, and the light source 4b is arranged at a position facing the second end surface 8b. Further, connecting portions 8d for fixing the rod portion 8 to the lamp body 2 are provided at both ends of the rod portion 8.

  The plate-shaped portion 10 has a first main surface 10a and a second main surface 10b facing each other, a first side surface 10c connecting the first main surface 10a and the second main surface 10b, and a side surface different from the first side surface 10c. And In the present embodiment, a side different from the first side 10c includes a second side 10d, a third side 10e, and a fourth side 10f. The first side face 10c contacts the second side face 10d and the fourth side face 10f. The second side surface 10d contacts the first side surface 10c and the third side surface 10e. The third side face 10e contacts the second side face 10d and the fourth side face 10f. The fourth side face 10f contacts the third side face 10e and the first side face 10c. Two sides that are in contact with each other are separated by a ridge.

  The light guide 6 has a structure in which the peripheral surface 8 c of the rod 8 is connected to the first side surface 10 c of the plate 10. The first side surface 10c extends along the direction in which the rod-shaped portion 8 extends, and is entirely connected to the peripheral surface 8c. The second side face 10d is a side face that is directed substantially vertically upward, the third side face 10e is a face that is directed substantially forward of the lamp, and the fourth side face 10f is a face that is directed substantially downward in the vertical direction.

  In the present embodiment, the diameter of the rod 8 is larger than the thickness of the plate 10. Further, the rod-shaped portion 8 and the plate-shaped portion 10 are integrally molded products. The integrally molded product can be manufactured by a conventionally known two-color molding or the like using a resin material in which the light diffusing material 11 is not mixed and a resin material in which the light diffusing material 11 is mixed.

  Further, the plate-shaped portion 10 has a twisted shape such that two main surfaces, that is, a first main surface 10a and a second main surface 10b can be simultaneously viewed when viewed from a predetermined first direction. In other words, the plate-shaped portion 10 has one end (second side surface 10d) and the other end (the fourth side 10d) of the plate-shaped portion 10 in the direction in which the virtual axis X parallel to the first main surface 10a or the second main surface 10b extends. The side surface 10f) is rotated about the virtual axis X in directions opposite to each other. Thereby, the first main surface 10a and the second main surface 10b can be simultaneously viewed from the same direction.

  Further, the plate-shaped portion 10 of the present embodiment has a shape twisted so that the first main surface 10a, the second main surface 10b, the second side surface 10d, and the third side surface 10e can be simultaneously viewed when viewed from the first direction. Have. In the present embodiment, when viewed from the front of the light guide 6 as an example of the first direction, the first main surface 10a, the second main surface 10b, the second side surface 10d, and the third side surface 10e can be viewed simultaneously. Yes (see also FIG. 1).

  Further, as described above, the front faces of the plurality of light guides 6 are gradually directed to the side of the vehicle body toward the outside in the vehicle width direction. For this reason, when the vehicle lamp 1 is observed from the front of the lamp, two main surfaces and two side surfaces of at least one light guide 6 can be visually recognized simultaneously in a wide angle range in the vehicle width direction.

  Light from each light source 4 enters the light guide 6 from the first end face 8a and the second end face 8b of the rod-shaped portion 8. The rod-shaped portion 8 guides the light of the light source 4 incident from one end toward the other end inside. In this process, the light of the light source 4 is emitted from the peripheral surface 8c to the plate-shaped portion 10. Specifically, the light of the light source 4a incident from the first end face 8a travels inside the rod-shaped portion 8 while being internally reflected toward the opposite second end face 8b. In this process, the light of the light source 4a leaks from the peripheral surface 8c to the plate-shaped portion 10 side at the connection portion between the peripheral surface 8c of the rod-shaped portion 8 and the first side surface 10c of the plate-shaped portion 10, and enters the plate-shaped portion 10. I do. The same applies to the light of the light source 4b incident from the second end face 8b.

  The light of the light source 4 incident on the plate-shaped portion 10 from the first side surface 10c is emitted from the first main surface 10a and the second main surface 10b by the light diffusing material 11 dispersed inside the plate-shaped portion 10. As a result, the first main surface 10a and the second main surface 10b emit surface light uniformly. Part of the light that has entered the plate-shaped portion 10 is also emitted from the second side surface 10d, the third side surface 10e, and the fourth side surface 10f. Since the plate-like portion 10 has a twisted shape so that the first main surface 10a, the second main surface 10b, the second side surface 10d, and the third side surface 10e can be simultaneously viewed when viewed from a predetermined direction, Light emission from four surfaces of the portion 10 can be visually recognized at a time.

  Further, as shown in FIGS. 7, 9A and 9B, in the light guide 6 of the present embodiment, the connection position M between the peripheral surface 8c and the first side surface 10c is a predetermined first position. The portion and the second portion farther from the light source 4 than the first portion have shapes that are displaced in the direction Y around the axis of the rod 8.

  Considering the first end surface 8a side as a reference, when viewed in a cross section orthogonal to the direction Z in which the rod-shaped portion 8 extends, the connection position Mb at the first portion at the position of the cross section along the line BB, The connection position Mc is shifted more clockwise than the connection position Mb from the connection position Mc at the second portion located at a position of a cross section along the line CC away from the light source 4a than the one portion.

  Considering the second end face 8b side as a reference, when viewed in a cross section orthogonal to the direction Z in which the rod-shaped portion 8 extends, the connection position Mc at the first portion at the position of the cross section along the line CC, The connection position Mb is shifted more counterclockwise than the connection position Mc from the connection position Mb at the second portion, which is located at the position of the BB line cross section farther from the light source 4b than the one portion.

  5 and 8, the connection position M is continuously shifted from the first portion to the second portion. The first portion includes one end of the plate-shaped portion 10, that is, the second side surface 10d, and the second portion includes the other end of the plate-shaped portion 10, that is, the fourth side surface 10f. That is, the connection position M of the plate-shaped portion 10 is continuously shifted in the direction Y around the axis from the second side surface 10d to the fourth side surface 10f. Furthermore, the connection position M is shifted in the same direction around the axis. That is, the first side surface 10 c of the plate-shaped portion 10 is spirally twisted around the rod-shaped portion 8. The rotation range of the first side surface 10c, in other words, the amount of displacement in the axial direction Y is, for example, １ ／ to ３ of the entire circumference of the peripheral surface 8c.

  The vehicle lamp 1 functions as, for example, a stop lamp, a tail lamp, a turn signal lamp, a clearance lamp, a daytime running lamp, or the like by emitting light from the plate portion 10 by turning on the light source 4a and / or the light source 4b. Can be. Further, the vehicle lamp 100 can exhibit the first lamp function by turning on the light source 4a, and can exhibit the second lamp function by turning on the light source 4b. In addition, the vehicle lamp 1 can achieve so-called sequential light emission by sequentially emitting light from the plurality of light guides 6.

  The plate-shaped part 10 has high transparency. In addition, the plate-shaped portion 10 is transparent and can uniformly emit light incident from the first side surface 10c from the first main surface 10a and the main surface 118a. Light is also emitted from the second side surface 10d to the fourth side surface 10f. That is, when the light source 4 is not turned on, the plate portion 10 looks transparent. On the other hand, when the light source 4 is turned on, the entire plate portion 10 appears to emit light.

  As described above, the vehicular lamp 1 according to the present embodiment includes the light source 4 and the light guide 6 having the rod-shaped portion 8 and the plate-shaped portion 10 containing the light diffusing material 11 therein. The light guide 6 is configured such that the peripheral surface 8c of the rod-shaped portion 8 is connected to the first side surface 10c of the plate-shaped portion 10, and the connection position M between the peripheral surface 8c and the first side surface 10c is a predetermined first portion. The second portion farther from the light source 4 than the one portion has a shape shifted in the direction around the axis of the rod portion 8. The light from the light source 4 enters the rod 8 from the end of the rod 8, enters the plate 10 from the peripheral surface 8 c of the rod 8, and is emitted from the main surface of the plate 10 by the light diffusing material 11. Is done.

  When the connection position M between the peripheral surface 8c of the rod portion 8 and the first side surface 10c of the plate portion 10 is not shifted in the direction around the axis of the rod portion 8, that is, the first side surface 10c is In the case of extending in parallel, the light internally reflected in the same direction in the rod-shaped portion 8 mainly enters the plate-shaped portion 10. For this reason, it is difficult to make the light in the rod-shaped portion 8 efficiently enter the plate-shaped portion 10. On the other hand, by gradually changing the connection position M in the direction around the axis of the rod 8, more light in the rod 8 can be incident on the plate 10. Thereby, the light which remains in the rod-shaped part 8 and is not emitted from the plate-shaped part 10 can be reduced. Therefore, the light use efficiency of the vehicle lamp 1 can be improved.

  Further, the connection position M of the present embodiment is continuously shifted from the first portion to the second portion. Thereby, the light use efficiency can be further improved. Further, the first portion includes one end of the plate portion 10, and the second portion includes the other end of the plate portion 10. Thus, the entire connection position M between the rod-shaped portion 8 and the plate-shaped portion 10 can be shifted in the direction around the axis. Therefore, the light use efficiency can be further improved. The connection positions M are shifted in the same direction around the axis. Thereby, the light use efficiency can be further improved.

  Further, the vehicle lamp 1 of the present embodiment contains the light source 4 and the light diffusing material 11 therein, so that the first main surface 10a and the second main surface 10b can be seen simultaneously when viewed from a predetermined first direction. And a light guide 6 having a plate-like portion 10 having a twisted shape. The light guide 6 emits the light of the light source 4 incident from the first side surface 10 c connecting the two main surfaces of the plate-shaped portion 10 from the two main surfaces by the light diffusing material 11.

  In this manner, by emitting light from the twisted main surface of the light guide, light emission of the light guide is visually recognized from more directions than in the case where light is emitted from the flat main surface of the light guide. be able to. Therefore, the visibility of the vehicle lamp 1 can be improved. In addition, three-dimensional light emission can be realized, and the design and appearance of the vehicle lamp 100 can be improved.

  Further, the plate-shaped portion 10 causes the first main surface 10a and the second main surface 10b to emit light by the light diffusing material 11. For this reason, the light incident from the side surface is reflected by a reflection element such as a step provided on the main surface inside the lamp, and the surface light can be more uniformly emitted as compared with a light guide emitted from the main surface outside the lamp. it can. Further, since the uniformity of light emission on the surface of the light guide can be improved, a pedestrian, a driver of another vehicle, or the like can more reliably visually recognize the light emission of the vehicle lamp 1. Therefore, the visibility of the vehicular lamp 1 can be further improved.

  In a structure in which light is emitted from the light guide by a reflection element such as a step, it is difficult to form the light guide into a complicated three-dimensional shape due to restrictions such as a direction in which a mold is removed when the light guide is molded. Met. On the other hand, in the present embodiment, since the light is emitted from the plate portion 10 by the light diffusing material 11, the plate portion 10 having a complicated three-dimensional shape can be easily manufactured by injection molding or the like. Thereby, the angle range in which the light emission of the light guide 6 can be visually recognized can be more easily expanded.

  Further, the plate-shaped portion 10 of the present embodiment rotates one end and the other end of the plate-shaped portion 10 in the direction in which the virtual axis X parallel to the main surface extends in opposite directions around the virtual axis X. It has the shape that was made. Thereby, the visibility of the vehicular lamp 1 can be more reliably increased. Further, the design and appearance of the vehicle lamp 100 can be improved.

  Further, the plate-shaped portion 10 has a side surface different from the first side surface 10c connecting the two main surfaces, and the plate-shaped portion 10 can simultaneously see the two main surfaces and the different side surfaces when viewed from the first direction. It has a twisted shape. Then, the light guide 6 emits the light incident from the first side surface 10c from the two main surfaces and the different side surfaces. Thereby, the visibility of the vehicular lamp 1 can be more reliably increased. Further, the design and appearance of the vehicle lamp 100 can be improved.

  Further, in the present embodiment, the second side face 10d and the third side face 10e are included in side faces different from the first side face 10c. Further, the plate-shaped portion 10 has a twisted shape such that two main surfaces, the second side surface 10d and the third side surface 10e, can be simultaneously viewed when viewed from the first direction. Then, the light guide 6 emits the light incident from the first side surface 10c from the two main surfaces, the second side surface 10d and the third side surface 10e. Thereby, the visibility of the vehicular lamp 1 can be more reliably increased. Further, the design and appearance of the vehicle lamp 100 can be improved. When there is no ridgeline between the second side surface 10d and the third side surface 10e and the two side surfaces are continuously viewed as one side surface (for convenience, this side surface is referred to as a second side surface 10d), the plate-like portion is used. It can be considered that 10 has a twisted shape so that the second side surface 10d and the two main surfaces are simultaneously visible, and light is emitted from the second side surface 10d and the two main surfaces.

  Further, the light guide 6 has a rod-shaped portion 8 whose peripheral surface 8c is connected to the first side surface 10c of the plate-shaped portion 10. Then, the light of the light source 4 is incident from the end of the rod-shaped portion 8, and the light is emitted from the peripheral surface 8 c to the plate-shaped portion 10 while guiding the light of the light source 4 inside. Therefore, the light of the light source 4 travels while being internally reflected in the rod-shaped portion 8, and in the process, the light leaking from the peripheral surface 8 c to the first side surface 10 c enters the plate-shaped portion 10. That is, the light of the light source 4 gradually enters the plate-shaped portion 10 while traveling in the rod-shaped portion 8. Thereby, the plate-shaped portion 10 can emit the surface light more uniformly.

  The embodiment of the invention has been described above in detail. The above-described embodiment merely shows a specific example for implementing the present invention. The contents of the embodiments do not limit the technical scope of the present invention, and many design changes such as changes, additions, and deletions of constituent elements are made without departing from the spirit of the invention defined in the claims. Is possible. The new embodiment with the design change has the effects of the combined embodiment and modification. In the above-described embodiment, such contents that can be changed in design are emphasized with notations such as “of the present embodiment” and “in the present embodiment”. The design change is allowed even for the contents without the. Any combination of the above components is also effective as an aspect of the present invention. The hatching attached to the cross section of the drawing does not limit the material to which the hatching is applied.

  The plate portion 10 may have a curved shape with a large curvature. Further, the light source 4 may be disposed only on one end side of the rod-shaped portion 8. Further, the light of the light source 4 may be reflected by the reflector and enter the rod 8. The number, arrangement and posture of the light guides 6 are not limited to the number, arrangement and posture in the embodiment.

  DESCRIPTION OF SYMBOLS 1 Vehicle lamp, 4, 4a, 4b light source, 6 light guide, 8 rod-shaped part, 8c peripheral surface, 10 plate-shaped part, 10a first main surface, 10b second main surface, 10c first side surface, 10d second Side view, 10e Third side view, 11 Light diffusing material.

Claims (4)

A light source,
A rod-shaped portion, and a light guide having a plate-shaped portion containing a light diffusing material therein,
With
The light guide is configured such that a peripheral surface of the rod-shaped portion is connected to a side surface of the plate-shaped portion, and a connection position of the peripheral surface and the side surface is a predetermined first portion and the light source more than the first portion. Having a shape displaced in the direction around the axis of the rod-shaped portion with the separated second portion,
The light of the light source is incident on the rod portion from an end of the rod portion, is incident on the plate portion from the peripheral surface of the rod portion, and is emitted from the main surface of the plate portion by the light diffusing material. A vehicle lighting device characterized by being performed.   The vehicular lamp according to claim 1, wherein the connection position is continuously shifted from the first part to the second part.   The vehicular lamp according to claim 1, wherein the first portion includes one end of the plate portion, and the second portion includes the other end of the plate portion. 4.   The vehicular lamp according to claim 3, wherein the connection positions are shifted in the same direction around the axis.

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