JP2014220158A - Vehicular lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting system capable of reducing the occupation rate of a non-light-emission region to a light-emission region.SOLUTION: A vehicular lighting system 1-1 in this embodiment includes a light-emitting part 2, a holding part 3, a light guide 4, a cover part 5, and a mounting part 6. The light-emitting part 2 has one or more light-emitting element 21. The holding part 3 holds the light-emitting part 2. The light guide 4 guides light from the light-emitting part 2 and delivers the light through a front end 4a on the opposite side to the side of the light-emitting part 2. The cover part 5 has a first fixed portion 51 to be fixed to the holding part 2, and a second fixing portion 52 having a smaller diameter than the first fixed portion 51 for fixing the light guide 4 to the inside in the state of exposing the front end 4a. The mounting part 6 for mounting the vehicular light system 1-1 on a light-delivered object (a lighting fixture) 100 to which the light is delivered from the light guide 4 is formed on the second fixing portion 52.

Description

  Embodiments described herein relate generally to a vehicle lighting device.

  BACKGROUND ART A vehicle lighting device using a light emitting element as a light source is used for a front combination light and a rear combination light. When a light emitting element is used as a lighting device, heat countermeasures for the light emitting element are important items. This is because the light emitting element has a characteristic that the light emission efficiency is lowered as the temperature of the element itself increases. In particular, since the lighting device for vehicles is mounted on a vehicle, it is required to maintain its function in a use environment from a low temperature environment of −40 ° C. to a high temperature environment of 85 ° C., and heat countermeasures under a high temperature environment are important. It becomes. In addition, since the vehicle lighting device is required to be miniaturized, a sufficient heat radiation area cannot be ensured, so that a countermeasure against heat becomes more important. Further, when a plurality of LED units already unitized so as to be mounted on a board are simply mounted on the printed board, the printed board becomes large, and the size of the vehicular illumination device cannot be avoided. By the way, some lighting devices have a light guide that guides light from a light emitting element.

JP 2011-249348 A JP 2010-129300 A

  Considering heat countermeasures and accommodating a large printed circuit board inside, the vehicle lighting device cannot be reduced in size, and as a result, the outer diameter of the vehicle lighting device increases. An attachment portion for attaching the vehicle illumination device to, for example, a lamp to which light from the vehicle illumination device is irradiated is provided on the outer peripheral surface of the vehicle illumination device. In this case, the outer diameter of the mounting portion increases in accordance with the diameter of the vehicular lighting device. Here, when the vehicle lighting device is attached to the lamp, normally, an insertion port for inserting the vehicle lighting device is formed in the lamp so that a part of the vehicle lighting device protrudes into the lamp. Since the attachment portion is attached to the lamp in the vicinity of the insertion opening, the insertion opening becomes larger in accordance with the outer diameter of the vehicle lighting device. Therefore, when the diameter of the vehicle lighting device is increased, when the vehicle lighting device is viewed from the front from the outside of the lamp, the ratio of the non-light emitting area that does not emit light to the light emitting area that emits light like the light emitting element There is a problem that becomes larger.

  An object of this invention is to provide the vehicle illuminating device which can make small the ratio which a non-light-emitting area accounts with respect to a light emission area, when it sees from the front.

  The vehicle lighting device of the embodiment includes a light emitting unit, a holding unit, a light guide, a lid unit, and an attachment unit. The light emitting unit has one or more light emitting elements. The holding unit holds the light emitting unit. The light guide guides the light from the light emitting part and irradiates it from the tip part opposite to the light emitting part side. The lid portion includes a first fixing portion that is fixed to the holding portion, and a second fixing portion that is smaller in diameter than the first fixing portion and fixes the light guide inside with the tip portion exposed. The attachment portion is for attaching the vehicle illumination device to the irradiation object irradiated with light from the light guide, and is formed in the second fixed portion.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle illuminating device which can make small the ratio which a non-light-emitting area accounts with respect to a light emission area when it sees from the front can be provided.

FIG. 1 is a diagram illustrating a relationship between a vehicle lighting device and a lamp according to the first embodiment. FIG. 2 is a perspective view illustrating the vehicular illumination device according to the first embodiment. FIG. 3 is a diagram illustrating a light distribution characteristic of the vehicular illumination device according to the first embodiment. FIG. 4 is a diagram illustrating the vehicular lighting device according to the second embodiment. FIG. 5 is a diagram illustrating a light distribution characteristic of the vehicular lighting device according to the second embodiment. FIG. 6 is a diagram illustrating a first modification of the vehicular lighting device according to the second embodiment. FIG. 7 is a diagram illustrating a second modification of the vehicular lighting device according to the second embodiment. FIG. 8 is a diagram illustrating a third modification of the vehicular lighting device according to the second embodiment. FIG. 9 is a diagram illustrating a fourth modification of the vehicle lighting device according to the second embodiment. FIG. 10 is a diagram illustrating the vehicular illumination device according to the third embodiment. FIG. 11 is a diagram illustrating the light distribution characteristics of the vehicular illumination device of the third embodiment.

  The vehicle lighting devices 1-1 to 1-3 according to the embodiments described below include a light emitting unit 2, a holding unit 3, a light guide 4, a lid unit 5, and an attachment unit 6. The light emitting unit 2 includes one or more light emitting elements 21. The holding unit 3 holds the light emitting unit 2. The light guide 4 guides the light from the light emitting part 2 and irradiates it from the tip part 4a opposite to the light emitting part 2 side. The lid portion 5 has a first fixing portion 51 fixed to the holding portion 3 and a second fixing that has a smaller diameter than the first fixing portion 51 and fixes the light guide 4 inside with the tip portion 4a exposed. Part 52. The attaching portion 6 attaches the vehicular illumination devices 1-1 to 1-3 to the irradiation object (lamp) 100 irradiated with light from the light guide 4, and is formed in the second fixing portion 52. ing.

  Further, in the vehicular illumination devices 1-1 to 1-3 according to the embodiments described below, the light guide 4 has a cylindrical shape, the outer diameter D1 of the light guide 4, and the outer diameter of the second fixing portion 52. The relationship between D2 and the ratio D1 / D2 is 0.1 ≦ D1 / D2 ≦ 0.9.

  Further, in the vehicular illumination devices 1-1 and 1-2 according to the embodiments described below, a concave portion 41 is formed at the distal end portion 4 a of the light guide 4.

  In the vehicular lighting device 1-2 according to the embodiment described below, the concave portion 41 has the reflective material 42 to 44 or the scattering material in close contact with the concave surface 41a.

  Further, the lid portion 5 to which the light guide 4 is fixed is detachable from the holding portion 3 from the vehicle lighting devices 1-1 to 1-3 according to the embodiments described below.

Embodiment 1
The embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating a relationship between a vehicular illumination device and a lamp according to an embodiment. FIG. 2 is a perspective view illustrating the vehicular illumination device according to the embodiment. FIG. 3 is a diagram illustrating light distribution characteristics of the vehicular lighting device according to the embodiment. 3 (the same applies to FIGS. 5 and 11), the radial axis indicates the intensity of light emitted from the vehicle illumination device (the intensity of the light increases toward the outside), and the circumferential axis indicates The solid line shown in the figure shows the light distribution characteristics in the horizontal plane, the alternate long and short dash line in the figure shows the light distribution characteristics in the vertical plane perpendicular to the horizontal plane, and the upper direction of the paper is the emission direction. It is.

  The vehicle lighting device 1-1 of the present embodiment is a vehicle lighting device used in the exterior or interior of a vehicle. For example, a stop lamp, a tail lamp, and a turn signal lamp that constitute a front combination light, a rear combination light, and the like. The fog lamp. As shown in FIG. 1, the vehicular lighting device 1-1 irradiates light to the lamp 100 in the present embodiment. The vehicular illumination device 1-1 includes a light emitting unit 2, a holding unit 3, a light guide 4, a lid unit 5, and an attachment unit 6. In the vehicular illumination device 1-1, the light emitting unit 2 and the holding unit 3 are accommodated in the lid 5, and the light guide 4 is fixed to the lid 5. In the present embodiment, one vehicular illumination device 1-1 is attached to the lamp 100. However, the present invention is not limited to this, and even if two or more vehicular illumination devices 1-1 are attached. Good.

  Here, the lamp 100 is an object to be irradiated, and the light emitted from the vehicle lighting device 1-1, that is, the light emitted from the light guide 4 is externally provided with a predetermined light distribution, in the present embodiment, outside the vehicle (not shown). It radiates. The lamp 100 includes a reflector 101, a lens 102, and a receiving portion 103. Here, in the lamp 100, the lens 102 is exposed to the outside of the vehicle, and the reflector 101 and the vehicle illumination device 1-1 are disposed inside the vehicle.

  The reflector 101 is formed in a concave shape and is disposed so as to surround the vehicle lighting device 1-1. The reflector 101 is usually formed of a resin material, and the inner peripheral surface of the reflector 101 is formed as a reflective surface (mirror surface) by forming a reflective layer on the inner peripheral surface with a reflective material such as aluminum. In the reflector 101, an insertion port 104 is formed for exposing the vehicular illumination device 1-1 to the inside. A part of a second fixing portion 52 (to be described later) of the lid portion 5 is inserted into the insertion port 104 of the reflector 101, and the space between the reflector 101 and the vehicle lighting device 1-1 is sealed by a packing (not shown). Yes.

  The lens 102 is a clear lens formed of a transparent material, in this embodiment, for example, a colorless and transparent resin material, glass, or the like, and closes the inside of the reflector 101. Since the lens 102 is transmissive, the light emitted from the vehicular illumination device 1-1, the light reflected by the reflecting surface of the reflector 101, and the like are transmitted through the lens 102 and irradiated outside the lamp 100. That is, it is irradiated outside the vehicle.

  The receiving portion 103 supports and fixes the vehicle lighting device 1-1 with respect to the lamp 100 by engaging the mounting portion 6 of the vehicle lighting device 1-1. The receiving portion 103 is formed so as to protrude to the side opposite to the lens 102 side of the insertion port 104, and a space portion 103a into which the attachment portion 6 is inserted is formed. The receiving portions 103 are formed in a number corresponding to the number of mounting portions 6 described later, and are arranged around the insertion port 104. The space | interval of the adjacent receiving part 103 is set so that the attaching part 6 can insert in the axial direction of the illuminating device 1-1 for vehicles. In addition, an opening (not shown) that communicates with the space portion 103a is formed on one of the circumferential side surfaces of the receiving portion 103.

  The light emitting unit 2 irradiates light and includes, for example, a light emitting element 21 mounted on a heat radiating substrate 22. The light emitting element 21 is a semiconductor element that emits light, such as an LED and an LD, and one or more, in the present embodiment, a plurality are directly mounted on the substrate 22 in series or in parallel. As shown in FIG. 1, each light emitting element 21 is electrically connected to a substrate 22 through a wire 23. The light emitting unit 2 is provided such that a reflector 24 that reflects light from the light emitting elements 21 surrounds all the light emitting elements 21. The reflector 24 has an inclined surface 24a whose inner peripheral surface widens from the substrate 22 side toward the light guide 4 side. For the purpose of preventing damage to the light emitting element 21 and cutting of the wire 23, the light emitting unit 2 fills a space made of the reflector 24, that is, a light emitting container that houses the light emitting element 21 with a permeable resin 25. Thus, the light emitting element 21 is resin-sealed. Accordingly, since the plurality of light emitting elements 21 are accommodated in the reflector 24, the light source can be reduced as compared with the case where the plurality of LED units already unitized so as to be mounted on the board are mounted on the printed board. Can be miniaturized. The substrate 22 is a mounting substrate on which the light emitting element 21 is mounted and a driving substrate on which a driving circuit that supplies power to the light emitting unit 2 is mounted. The substrate 22 has a component placement surface on the light guide 4 side, and the above-described light emitting elements 21, the reflectors 24, and control elements (not shown) for controlling the respective light emitting elements 21 are mounted. The board 22 has a heat radiating surface on the side opposite to the component placement surface, and is fixed in a state of being in contact with the mount 31 of the holding unit 3 in this embodiment. The substrate 22 is an insulating substrate formed of a material that can easily transfer heat generated by the light emitting element 21 such as metal or ceramic having high thermal conductivity. The substrate 22 is connected to a power supply member (not shown), is electrically connected to an external power supply (not shown) provided outside the vehicle lighting device 1-1, and is connected to each light emitting element 21 via the power supply member. Power is supplied. The connection between each light emitting element 21 and the power feeding member may be either in parallel or in series.

  The holding unit 3 holds the light emitting unit 2 and is also a heat radiating member that radiates heat from the light emitting unit 2. Of the holding part 3, the main body part 32 including the mount 31 on which the light emitting part 2 is placed is made of a resin material. In the present embodiment, as shown in FIG. The heat sink 33 made of metal is attached to the main body 32 made of a resin material. Since the heat sink 33 expands the surface area of the holding unit 3 with respect to the outside, the heat dissipation area is improved and the heat dissipation effect is improved. Note that the main body portion 32 and the heat sink 33 of the holding portion 3 may be formed integrally with a highly radioactive resin or the like.

  The light guide 4 guides the light from the light emitting unit 2 and irradiates the lamp 100. The light guide 4 is formed in a columnar shape, and light from the light emitting part 2 guided from the tip part 4a opposite to the light emitting part 2 is emitted. The light guide 4 is formed of a material having a high light transmittance, such as a transparent acrylic resin, glass, or polycarbonate. The light guide 4 is disposed opposite to the light emitting portion 2 on the side opposite to the tip portion 4a in the axial direction. The light guide 4 is optically connected to the light emitting part 2 with a slight gap in order to guide all or most of the light from the light emitting part 2. That is, the light from the light emitting unit 2 is incident from the end of the light guide 4 on the light emitting unit 2 side, and is irradiated from the front end 4a to the outside, that is, the lamp 100 while being totally reflected in the light guide 4.

  Here, the light guide 4 has a concave portion 41 formed at the distal end portion 4a. The recess 41 is formed in, for example, a truncated cone shape (in the cross-sectional shape in the plane including the axis of the light guide 4, a trapezoid that spreads toward the tip portion 4 a), and is a space portion that communicates with the outside. Therefore, light incident on a portion inclined with respect to the axial direction in the concave surface 41a which is a boundary surface between the light guide 4 forming the concave portion 41 and the outside is condensed in the light emitting direction. The light guide 4 in this embodiment is made of a transparent resin material such as acrylic and is formed in a columnar shape having an outer diameter of 9 mm and a height of 24 mm. The recess 41 has a diameter of 9 mm, a depth of 5 mm, and a bottom surface of the tip portion 4a. It is formed in the shape of a truncated cone having a diameter of 4 mm at the (end portion inside the light guide 4).

  The lid 5 fixes the holding unit 3 and the light guide 4 and includes a first fixing unit 51, a second fixing unit 52, and a through hole 53. The 1st fixing | fixed part 51 is fixed to the holding | maintenance part 3, and is formed in the bottomed cylindrical shape. The 1st fixing | fixed part 51 obstruct | occludes the light emission part 2 with respect to the exterior with the holding | maintenance part 3. FIG. The first fixing portion 51 communicates with the through hole 53 inside. In the present embodiment, when the first fixing portion 51 is fixed to the main body portion 32 of the holding portion 3, a part of the light emitting portion 2 is penetrated. It will be in the state inserted in the hole 53. Therefore, it can suppress that the light from the light emission part 2 is irradiated between the 1st fixing | fixed part 51 and the holding | maintenance part 3. FIG. The 1st fixing | fixed part 51 is being fixed to the holding | maintenance part 3 via the packing which is not shown comprised comprised with the material which has elasticity. That is, it is possible to prevent the external atmosphere from entering from the portion fixed to the holding portion 3 of the lid portion 5 by the packing. The first fixing portion 51 is fixed to the main body portion 32 so that the heat sink 33 protrudes to the outside from the first fixing portion 51. The 2nd fixing | fixed part 52 fixes the light guide 4 inside. The 2nd fixing | fixed part 52 is cylindrical shape and the through-hole 53 is formed in the inside. Here, the outer diameter D <b> 2 of the second fixing portion 52 is set smaller than the outer diameter D <b> 3 of the first fixing portion 51. The outer diameter D <b> 2 of the second fixing portion 52 is determined when the vehicle illumination device 1-1 is attached to the lamp 100 when the vehicle illumination device 1-1 is attached to the lamp 100 by the attachment portion 6. It is preferable that the diameter is as small as possible so as to approach the outer diameter D1 of the light guide 4 on the assumption that it can sufficiently withstand the external force during removal. The 2nd fixing | fixed part 52 fixes the light guide 4 inserted in the through-hole 53 in the state which the front-end | tip part 4a exposed. Here, the fixing method of the light guide 4 is not particularly limited, and may be any of an engaging means, a mechanical fixing means such as a fastening means, and a chemical fixing means such as adhesion. .

  Here, the ratio D1 / D2 between the outer diameter D1 of the light guide 4 and the outer diameter D2 of the second fixing portion 52 is a relationship of 0.1 ≦ D1 / D2 ≦ 0.9. When the ratio D1 / D2 is less than 0.1, the ratio of the non-light emitting region is large and the design is impaired. On the other hand, when the ratio D1 / D2 exceeds 0.9, the strength of the mounting portion 6 is reduced, and damage due to vibration and impact occurs.

  The attachment portion 6 attaches the vehicular illumination device 1-1 to the lamp 100 that is an irradiation object. The attachment portion 6 is formed on the second fixing portion 52 and is engaged with the receiving portion 103. In the present embodiment, a plurality of attachment portions 6 are formed in the circumferential direction of the second fixing portion 52. Here, attachment of the lighting device 1-1 for the vehicle to the lamp 100 by the attachment portion 6 is performed by first inserting the distal end portion 4a of the light guide 4 into the insertion port 104 from the side opposite to the lens 102 side, while attaching each attachment portion 6. The second fixing portion 52 is inserted into the insertion port 104 until it faces each receiving portion 103 in the circumferential direction. Next, the vehicle lighting device 1-1 is rotated about the axis with respect to the lamp 100, and each attachment portion 6 is inserted into each space portion 103a from the opening, whereby each attachment portion 6 is engaged with each receiving portion 103. Combine. Thereby, the vehicular illumination device 1-1 is attached to the lamp 100 in a state in which the distal end portion 4a of the light guide 4 is exposed to the inside of the lamp 100.

  Next, operation | movement of the illuminating device 1-1 for vehicles is demonstrated. The vehicle lighting device 1-1 is fixed to the lamp 100 as described above, and the power feeding member is electrically connected to an external power source. When the supply of power from the external power source is started, the power from the external power source supplied to the substrate 22 through the power supply member emits light by the power supplied to each light emitting element 21, and the light emitting unit 2 emits light. . The light irradiated from the light emitting unit 2 is irradiated to the light guide 4 from the end surface facing the light emitting unit 2 in the through hole 53. The light guided in the light guide 4 is irradiated into the lamp 100 from the distal end portion 4a, passes through the lens 102 from the lamp 100, and is irradiated outside, that is, outside the vehicle.

  Here, as shown in FIG. 3, the light distribution characteristic of the light emitted from the vehicular illumination device 1-1 is directed from the vehicular illumination device 1-1, that is, from the front end portion 4a of the light guide 4 to the light emission direction. Light is emitted so as to be condensed. In particular, the intensity of light emitted in the emission direction is the strongest. Therefore, the vehicular lighting device 1-1 can obtain a light distribution characteristic having strong directivity in the light emitting direction by forming the recess 41 in the light guide 4. That is, by forming the recess 41 in the light guide 4, the light directivity can be adjusted with respect to the light guide 4 in which the recess 41 is not formed, and desired light distribution characteristics can be obtained.

  As described above, in the vehicular illumination device 1-1 according to the present embodiment, the outer diameter D2 of the second fixing portion 52 that fixes the light guide 4 with the tip portion 4a exposed is the first fixing portion 51. Since the vehicle lighting device 1-1 is attached to the lamp 100 by the attachment portion 6 formed in the second fixing portion 52, which is smaller than the outer diameter D3, the outer diameter of the attachment portion 6 can be reduced. The diameter of the insertion port 104 through which the vehicular illumination device 1-1 of the lamp 100 protrudes can be reduced. Moreover, the part exposed to the lamp 100 among the illuminating device 1-1 for vehicles becomes the light guide 4 and the 2nd fixing | fixed part 52. As shown in FIG. That is, it is possible to prevent the first fixing portion 51 from being visually recognized from the lamp 100. Therefore, when the vehicular illumination device 1-1 is viewed from the front, the ratio of the cover 5 serving as the non-light emitting area to the light guide 4 serving as the light emitting area can be reduced. Thereby, when the vehicle lighting device 1-1 is viewed from the outside of the lamp 100, the lid 5 can be suppressed from being noticeable, and the influence of the non-light-emitting region on the design of the lamp 100 can be reduced. it can.

  Further, since the second fixing portion 52 formed with the attachment portion 6 attached to the lamp 100 and the light guide 4 are separate members, the fixing position in the axial direction of the light guide 4 with respect to the second fixing portion 52 can be changed. it can. Therefore, since the height of the front-end | tip part 4a of the light guide 4 with respect to the lamp 100 can be changed, the light distribution characteristic of the illuminating device 1-1 for vehicles with respect to the lamp 100 can be changed arbitrarily.

  Moreover, since the light emission part 2 can be spaced apart with respect to the lamp 100, while being able to suppress that the lighting device 1-1 for vehicles has received the influence of heat deformation etc. by the heat of heat dissipation, for example, the lamp 100 can remain in heat. Since it can suppress that heat is radiated from the lighting device 1-1 for vehicles inside the easy lamp 100, it can suppress that heat dissipation falls by attaching the lighting device 1-1 for vehicles to the lamp 100. FIG. In addition, compared to the shape of the first fixing portion 51 determined by the shape of the substrate 22 or the like, the second fixing portion 52 can be formed with the mounting portion 6, and if the light guide 4 can be fixed inside, there is no shape limitation. Since the shape of the non-light-emitting area, that is, the shape of the second fixing portion 52 can be selected as appropriate when the vehicular illumination device 1-1 is viewed from the outside of the lamp 100, the design of the vehicular illumination device 1-1 can be selected. Can be improved.

  In the first embodiment, the truncated conical concave portion 41 has been described. However, the shape of the concave portion 41 is not limited to this, and a bottomed cylindrical shape (for example, the bottom surface is horizontal), a conical shape, or an elliptical cone shape. It may be formed in a shape or the like. Moreover, as for the recessed part 41, the outer peripheral line in a cross-sectional shape may be either a straight line or a curve. Moreover, the outer peripheral surface of the front-end | tip part 4a of the light guide 4 may be flared from the front-end | tip part 4a side toward the light emission part 2, for example, may be formed in the taper shape.

  Moreover, in the said Embodiment 1, the recessed part surface 41a of the recessed part 41 may be formed in the rough surface. For example, the concave surface 41a is formed so that the concave surface 41a is rough when the surface roughness Ra is 0.2 or more. Accordingly, the light incident on the concave surface 41a is scattered and emitted to the outside from the concave surface 41a because the concave surface 41a is a rough surface, so that the concave surface 41a has a rough surface. It can be made different from the light distribution characteristic in the case of no. For example, the light distribution characteristic can be an incandescent bulb.

[Embodiment 2]
Next, Embodiment 2 will be described. FIG. 4 is a diagram illustrating the vehicular lighting device according to the second embodiment. FIG. 5 is a diagram illustrating a light distribution characteristic of the vehicular lighting device according to the second embodiment. Since the basic configuration of the vehicular lighting device 1-2 according to the second embodiment is the same as that of the vehicular lighting device 1-1 according to the first embodiment, the description thereof is omitted or simplified (the same applies to the third embodiment). ). The vehicle illumination device 1-2 shown in FIG. 4 is different from the vehicle illumination device 1-1 in that the reflective material 42 is in close contact with the recess surface 41a of the recess 41.

  The concave portion 41 of the light guide 4 has a conical shape, and the reflective material 42 is filled in the concave portion 41 so that the reflective material 42 is in close contact with the concave surface 41a. The reflective material 42 is, for example, a material containing a reflective material (white particles such as titanium oxide, barium sulfate, and calcium carbonate) using the same material as the material forming the light guide 4 as a base material. The filling portion made of the reflective material 42 may be integrally molded with the light guide 4 or may be optically connected with another member. The reflective material 42 reflects light incident on the reflective material 42 from the light guide 4 into the light guide 4. Therefore, it is possible to prevent light from being radiated from the reflective material 42 to the outside of the light guide 4. The light guide 4 in this embodiment is made of a transparent resin material such as acrylic and is formed in a cylindrical shape having an outer diameter of 9 mm and a height of 24 mm, and the concave portion 41 is a cone having a diameter of 9 mm and a depth of 5 mm at the distal end portion 4a. It is formed in a shape.

  Here, the light distribution characteristic of the light emitted from the vehicular illumination device 1-2 is radiated in the light emitting direction from the vehicular illumination device 1-2, that is, the distal end portion 4a of the light guide 4, as shown in FIG. Most of the light emitted from the outer periphery of the light guide 4 is light, and in particular, the light is obliquely behind the tip portion 4a of the light guide 4 (on the light emitting portion 2 side and radially outside the light guide 4). Is emitted. Therefore, the vehicular lighting device 1-2 is filled with the reflective material 42 in the concave portion 41 so that the reflective material 42 is in close contact with the concave surface 41a. The light distribution characteristic with strong directivity can be obtained. That is, by bringing the reflective material 42 into close contact with the concave surface 41a of the light guide 4, the directivity of light can be adjusted with respect to the light guide 4 in which only the concave portion 41 is formed, and desired light distribution characteristics can be obtained. Can do.

  In the second embodiment, the reflective material 42 is filled in the recess 41, but the present invention is not limited to this. FIG. 6 is a diagram illustrating a first modification of the vehicular lighting device according to the second embodiment. FIG. 7 is a diagram illustrating a second modification of the vehicular lighting device according to the second embodiment. For example, as shown in FIG. 6, even if the reflective material 43 formed on the sheet-like member is adhered to the concave surface 41a of the concave portion 41 with a transparent adhesive or the like, the reflective material 44 is brought into close contact with the concave surface 41a. Good. In addition, for example, as shown in FIG. 7, a reflective material 43 in a liquid or paste form is applied or painted on the concave surface 41a of the concave portion 41 and dried, so that the reflective material 43 is not filled in all of the concave portion 41. You may make it closely_contact | adhere to the recessed surface 41a.

  In the second embodiment, the reflective materials 42 to 44 are in close contact with the concave surface 41a. However, the scattering material may be in close contact with the concave surface 41a. The scattering material is, for example, a material containing a scattering material (such as scattering powder such as titanium oxide, barium sulfate, and calcium carbonate) using the same material as the material forming the light guide 4 as a base material. When the scattering material is brought into intimate contact with the concave surface 41a, light incident on the scattering material through the concave surface 41a is scattered and radiated to the outside from the concave portion 41. Therefore, the concave surface 41a has a rough surface. It can be made different from the light distribution characteristic in the case where it is not formed. FIG. 8 is a diagram illustrating a third modification of the vehicular lighting device according to the second embodiment. FIG. 9 is a diagram illustrating a fourth modification of the vehicle lighting device according to the second embodiment. For example, as shown in FIG. 8, the conical recess 41 may be filled with a scattering material 45 so that the scattering material 45 is in close contact with the recess surface 41a. In this case, the light distribution can be made to spread the light distribution characteristics to the entire periphery. For example, as shown in FIG. 9, the bottomed cylindrical concave portion 41 may be filled with a scattering material 46 so that the scattering material 46 is brought into close contact with the concave surface 41a. In this case, the light distribution characteristic can be a light distribution radiated from the tip portion 4a of the light guide 4 while diffusing in the light emitting direction. The light guide 4 in the figure is made of a transparent resin material such as acrylic and is formed in a cylindrical shape having an outer diameter of 9 mm and a height of 24 mm, and the recess 41 has a diameter of 2.5 mm at the distal end portion 4 a and a depth of 5 mm. It is formed in a cylindrical shape.

[Embodiment 3]
Next, Embodiment 3 will be described. FIG. 10 is a diagram illustrating the vehicular illumination device according to the third embodiment. FIG. 11 is a diagram illustrating the light distribution characteristics of the vehicular illumination device of the third embodiment. The vehicle illumination device 1-3 shown in FIG. 10 is different from the vehicle illumination device 1-1 in that the concave portion 41 is not formed in the light guide 4.

  Since the front end portion 4a of the light guide 4 is formed in a plane, the light guided through the light guide 4 is radiated to the outside without changing the optical path. Therefore, the light distribution characteristic of the light emitted from the vehicle lighting device 1-3 is diffused in the light emitting direction from the vehicle lighting device 1-3, that is, the front end portion 4a of the light guide 4, as shown in FIG. Although it is emitted, the intensity of light in the emission direction is particularly lower than the intensity of light around the emission direction.

  The vehicular illumination device 1-3 can be applied not only when the lamp 100 is directly irradiated with light, but also when the lamp is irradiated via a lamp-side light guide (not shown), for example. In the case of indirectly irradiating light to the lamp 100, the light distribution characteristic of the vehicle lighting device 1-3 is preferably the same as the light emitted from the optically connected lamp-side light guide. Therefore, the light distribution characteristic of the light emitted from the light guide 4 having the same function as that of the lamp-side light guide is made to enter the lamp-side light guide as it is without being changed. Thereby, by applying a different one from the assumed light distribution characteristic (light distribution characteristic of the vehicle illumination device 1-3), such as the light distribution property of the vehicle illumination devices 1-1 and 1-2, It can suppress that the light distribution characteristic of the light radiated | emitted from a lamp side light guide differs from a desired light distribution characteristic.

  In the first to third embodiments, the lid 5 to which the light guide 4 is fixed may be detachable from the holding unit 3. In this case, different types of light guides 4 corresponding to the respective embodiments (modifications) are previously unitized by being fixed to the lid 5 in advance. On the other hand, the light emitting unit 2 is held in the holding unit 3 to be unitized in advance. And the unit of the light guide 4 and the cover part 5 suitable for the light distribution characteristic of the vehicle illuminating device 1-1 to 1-3 required according to the lamp 100 (irradiation target) to attach is selected, and the light emission part 2 And attached to the unit of the holding unit 3. Thus, by selecting and exchanging the units of the light guide 4 and the lid 5 with respect to the units of the light emitting unit 2 and the holding unit 3, the vehicle lighting devices 1-1 to 1-3 having desired light distribution characteristics can be obtained. Can be provided.

  In the first to third embodiments, the substrate 22 functions as a mounting substrate and a driving substrate. However, the mounting substrate and the driving substrate may be separate. In this case, since the driving substrate is not mounted with a large amount of heat generation such as each light emitting element 21, heat transfer is not considered important. Therefore, the driving substrate is made of an inexpensive material such as paper phenol, paper epoxy, or glass epoxy. It can be the formed insulating substrate.

  Moreover, the light guide 4 of the said Embodiments 1-3 is formed in the column shape, and the dimension is 0 mm-50 mm in the part which protrudes from the cover part 5 among the outer diameters of 5 mm-20 mm, and height. The portion inserted into the through hole 53 is formed to be in the range of 1 mm to 30 mm. Further, when the concave portion 41 is formed in the light guide 4, it is formed in a truncated cone shape, a conical shape, or a cylindrical shape, and the size thereof is 2 mm to 19 mm in diameter at the distal end portion 4 a (outside of the light guide 4). Diameter does not exceed), depth is 1 mm to 40 mm (height does not exceed the height of the light guide 4), and diameter on the bottom surface (end of the light guide 4) is 0 mm to 19 mm (exceeds the outer diameter of the light guide 4) Not).

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

1-1 to 1-3 Lighting device for vehicle
2 Light emitting part
21 Light emitting device
3 Holding part
4 Light guide
4a Tip
41 Recess 42-44 Reflective material
5 Lid
51 1st fixing part
52 Second fixing part
6 Mounting part
100 lights

Claims (5)

A light emitting part having one or more light emitting elements;
A holding unit for holding the light emitting unit;
A light guide that guides light from the light emitting part and irradiates from a tip part opposite to the light emitting part side;
A lid portion having a first fixing portion fixed to the holding portion, and a second fixing portion having a smaller diameter than the first fixing portion and fixing the light guide inside with the tip portion exposed. ,
A mounting portion for attaching the vehicle illumination device to the irradiation object irradiated with light from the light guide;
Vehicular lighting device comprising:
The vehicle lighting device, wherein the attachment portion is formed in the second fixing portion. The vehicle lighting device according to claim 1,
The light guide has a cylindrical shape,
The vehicle illumination device in which the outer diameter D1 of the light guide, the outer diameter D2 of the second fixed portion, and the ratio D1 / D2 are in the relationship of the following formula (1).

0.1 ≦ D1 / D2 ≦ 0.9 (1) In the vehicle lighting device according to claim 1 or 2,
A vehicle lighting device in which a concave portion is formed at the tip of the light guide. The vehicle lighting device according to claim 3,
The concave portion is a vehicle lighting device in which a reflective material or a scattering material is in intimate contact with the concave surface. In the vehicle lighting device according to any one of claims 1 to 4,
The vehicular lighting device in which the lid portion to which the light guide is fixed is detachable from the holding portion.

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