JP2016018601A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for making a light guide body evenly emit light, in a lighting fixture using the light guide body.SOLUTION: Into a light guide body 20 in which light source light is made incident from a light incident part 22 to be one end part or one side surface, and which guides light thereinside and emits light forward with reflection of an inner surface reflection part 23, as the light source light, light of a laser diode 16 and light-emitting diode 12 are made incident. Light emission is performed in a region X on the light incident part 22 side of the light guide body 20 by light of the light-emitting diode 12, and light emission is performed in a region Y separate from the light incident part 22 by light of the laser diode 16.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lamp, and more particularly to a vehicular lamp.

  In recent years, as a vehicle lamp, for example, as a clearance lamp or a daytime running lamp, a light guide that emits light emitted from a light-emitting diode light source from one end and guides the light inside is emitted. The one used is known (see, for example, Patent Documents 1 and 2).

JP 2013-243068 A JP 2013-62110 A

  However, in the light guide as in Patent Documents 1 and 2, the light emission becomes weaker as it goes from one side (light incident part side) on which light is incident to the other side, that is, away from the light source. There was a problem that light was not emitted uniformly.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a technique for uniformly emitting light from a light guide in a lamp using the light guide.

  In order to solve the above-described problems, a lamp according to an aspect of the present invention is such that a light source light is incident from a light incident portion that is one end portion or one side surface, is guided inside, and is reflected forward by an internal reflection portion. The light from the laser diode and the light emitting diode is incident on the light guide that emits light toward the light source as the light source light.

  According to this aspect, the light of the light emitting diode is guided while diffusing in the light guide, reflected by the inner reflection portion, and emitted forward. On the other hand, the light of the laser diode does not enter the inner reflection part on the light incident part side of the light guide due to its light condensing property, but diffuses after being reflected on the other end or the other side of the light guide. The light is reflected by the inner reflection part and emitted forward.

  As a result, the laser diode and the light emitting diode with different optical characteristics are incident from one side of the light guide, and the light incident portion side area of the light guide is emitted by the light from the light emitting diode. Since the area away from the light incident part side is emitted by the light, the entire light guide can be made to emit light uniformly.

  Moreover, according to this aspect, since the entire light guide can be caused to emit light uniformly with the one-side light source, it is not necessary to arrange the light source on the other end or the other side surface of the light guide. As a result, the degree of freedom in designing the lamp is increased, and it is not necessary to cover the other side of the light guide with an extension (blindfold member) or the like, and the light emission appearance is formed such that the other side of the light guide floats in the air. be able to.

  In the above aspect, at least a light incident part side of the light guide where the light of the laser diode is incident may have a reduced curvature part where the light of the laser diode is not incident on the inner reflection part. Thereby, the light of the laser diode can surely bear light emission in a region away from the light incident part side.

  In the above aspect, the colors of the laser diode and the light emitting diode may be different. As a result, the light guide body emits light in the light emission color associated with the light emitting diode on the light incident portion side, and the light emission color associated with the laser diode as it is far from the light incident portion, so that gradation light emission is possible and the design of the light guide body is improved. To do.

  According to the present invention, in a lamp using a light guide, the light guide can emit light uniformly.

Front view of the lamp according to the first embodiment Cross-sectional view of the lamp according to the first embodiment Front view of the lamp according to the second embodiment The partially enlarged view of the clearance lamp which concerns on the modification of 1st Embodiment

  Next, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a front view of a lamp according to the first embodiment, and FIG. 2 is a cross-sectional view of the lamp according to the first embodiment (cross-sectional view taken along line II-II in FIG. 1).

  As shown in FIG. 1, the lamp 1 is a vehicle headlamp and is mounted on each of the left and right sides of the front portion of the vehicle. The following configuration is mounted on the right side when the vehicle is viewed from the front. In the lamp 1, a clearance lamp D that also serves as a low beam lamp A, a high beam lamp B, a turn signal lamp C, and a daytime running lamp is accommodated in a lamp chamber S composed of a lamp body 2 and a transparent front cover 4. A combination headlamp. In addition, in this specification, it represents upper and lower, right and left front and back on the basis of the state (state of FIG. 1) which looked at the lamp 1 with which the vehicle was mounted | worn by the front.

  The low beam lamp A, the high beam lamp B, and the turn signal lamp C are arranged in the lamp chamber S side by side in the vehicle width direction. For these lamps A, B and C, for example, a reflective or projector-type vehicular lamp may be used.

  The clearance lamp D is disposed along the upper side of the lamp 1 in the upper area of the lamps A, B, and C, and includes a light source 10 and a light guide 20 as shown in FIG. .

  The light guide 20 is a rod-shaped optical member, and is formed by injection molding a transparent resin such as acrylic or polycarbonate. One end, that is, the left end in the present embodiment, is a light incident portion 22 that receives light from the light source 10 to be described later with respect to the main body 21 serving as a light emitting portion of the light guide 20. In the present embodiment, the light incident portion 22 has a bifurcated shape, and one of the light incident portions 22 extends rearward as shown in FIG. That is, in the light guide 20, the light incident portion 22 that is one end of the light guide 20 is branched, and the first light incident portion 221 on the axial direction of the light guide 20 and the axial direction of the light guide 20. A second light incident portion 222 in a direction intersecting with the second light incident portion 222. The light guide 20 internally guides the light incident from the light incident part 22 (the first light incident part 221 and the second light incident part 222) toward the other end part 24.

  As shown in FIG. 2, the rear surface portion of the peripheral surface of the main body 21 of the rod-shaped light guide 20 has an inner surface reflection portion 23 formed of a plurality of prismatic grooves along the axial direction of the light guide 20. Is formed. The inner surface reflection portion 23 reflects a part of the light guide traveling in the light guide 20 toward the front. The inner surface reflection portion 23 may be formed by engraving a shape for light diffusion such as step, embossing, dot printing, or a reflection film. The shape, size, arrangement pitch, and the like of the inner surface reflection portion 23 are designed so that light having the intensity required for the clearance lamp is irradiated forward.

  A portion on the front surface side of the peripheral surface of the main body 21 of the light guide 20 functions as an emission surface that emits light forward of the lamp. The light guide 20 guides the light incident from the first light incident part 221 and the second light incident part 222 inside, and reflects the light from the front side of the light guide body 21 by reflection by the inner surface reflection part 23. It emits toward the front.

  The cross-sectional shape of the light guide 20 (the cross-sectional shape perpendicular to the axial direction of the light guide 20) is preferably substantially circular and is circular in this embodiment, but is not particularly limited. It may be formed in various shapes such as a shape.

  As for the overall shape of the light guide 20, a curving portion 25 is formed on the first light incident portion 221 side. The reduced curvature portion 25 will be described later.

  As shown in FIG. 2, the light source 10 includes an LED module 12 and an LD module 16.

  The LED module 12 has a configuration in which a fluorescent layer is formed on a light emitting diode (hereinafter referred to as LED) chip mounted on a substrate. From the LED module 12, a fluorescent layer excited by receiving LED light that emits ultraviolet light or short-wavelength visible light emits white light by adding blue, green and red, and emits this white light in a diffuse manner. To do.

  The LD module 16 is a semiconductor light emitting device called a can package type, which is a laser diode (Laser Diode, hereinafter referred to as “LD”) element mounted on a substrate, and welded to the substrate to make the LD element an inert gas atmosphere. A can cap for sealing, a fluorescent layer formed in an opening formed in a central portion of the upper surface of the can cap, and a condensing lens disposed on the optical axis of the LD element in the can cap. From the LD module 16, LD light that emits ultraviolet light or short-wavelength visible light is polarized toward the fluorescent layer by the condenser lens, and the fluorescent layer excited by receiving the collected LD light has blue, green, and Red color is added and mixed to emit white light, and white light with a high concentration is emitted.

  The LED module 12 and the LD module 16 are fixed to a heat sink 18. The heat sink 18 is made of a metal block with high heat dissipation, for example, aluminum die casting, and is configured in a shape that allows the LED module 12 and the LD module 16 to be arranged at a required position in the lamp chamber S, and from the LED chip and the LD element. Dissipate the heat generated. The heat sink 18 is fixed to the lamp body 2 or the like.

  The LD module 16 is disposed on the first light incident portion 221 of the light guide 20 and is formed on the heat sink 18 so that the optical axis of the LD module 16 is orthogonal to the end surface of the first light incident portion 221. Fixed to the pedestal. The LD module 16 is preferably disposed in the first light incident portion 221 located on the axial direction of the light guide 20 as will be described in the later-described curving portion 25.

  The LED module 12 is arranged with respect to the second light incident portion 222 of the light guide 20, and is common to the LD module 16 so that the optical axis of the LED module 12 is orthogonal to the end surface of the second light incident portion 222. The heat sink 18 is fixed to another pedestal.

  An extension member 6 disposed between the light source 10 and the front cover 4 is disposed in front of the light source 10 in the lamp chamber S. The structure of the light source 10 is covered by the extension member 6 and is hidden from the outside.

  The LED light incident on the light guide 20 from the second light incident portion 222 is incident obliquely with respect to the axial direction of the light guide body 21 and is guided while being well diffused in the light guide 20. The light is reflected by the inner surface reflection portion 23 and emitted forward. That is, LED light having a relatively high diffusibility is well reflected by the inner surface reflection part 23 on the light incident part 22 side and emitted, and is an area close to the light incident part 22 in the light guide body 21 (area in FIG. 2). (Illustrated as X) mainly emit light.

  On the other hand, the LD light incident on the light guide 20 from the first light incident part 221 travels straight in the light guide 20 from the first light incident part 221.

  Here, in the present embodiment, the light guide 20 is formed with a reduced curvature portion 25 on the first light incident portion 221 side where the LD light is incident. Specifically, in the entire length of the light guide 20, a region extending from the first light incident part 221 to approximately two thirds of the light guide body 21 on the first light incident part 221 side is formed in a straight line. Thereafter, it is formed in a shape with a gentle curve toward the rear of the lamp and below the lamp, and thereafter, it is formed in a straight line over a region of approximately one third on the other end 24 side. One linear region on the light incident portion 221 side and the gentle curve region are formed as the reduced curvature portion 25.

  Since most of the LD light incident from the first light incident part 221 has the curving part 25 on the first light incident part 221 side, the inner surface reflecting part on the light incident part 22 side (decreasing curving part 25). It does not enter 23 and goes straight to the other end 24 of the light guide 20 satisfactorily. The LD light is reflected by the end surface of the other end portion 24 and may be diffused, and is reflected by the inner surface reflection portion 23 on the other end portion 24 side and emitted. In addition, a part of the LD light incident from the first light incident part 221 is not incident on the inner reflection part 23 in the curving part 25 but is reflected and emitted by the inner reflecting part 23 after the curving part 25. That is, the LD light having a relatively high light condensing property mainly emits light in a region (shown as region Y in FIG. 2) far from the light incident portion 22.

  As described above, according to the present embodiment, the one end portion 22 of the rod-shaped light guide 20 has different optical characteristics, that is, LED light having relatively high diffusibility and relatively high light condensing performance. By making the LD light incident simultaneously, a region (region X) on the light incident portion 22 side of the light guide 20 emits light by LED light, and a region (region Y) away from the light incident portion 22 side emits light by LD light. To do. Thus, the light guide 20 (the light guide body 21 serving as the light emitting portion) is entirely uniform with the one-side light source with respect to the one end portion 22 without arranging the light sources at both ends 22 and 24 of the light guide 20. Can emit light.

  In addition, the light guide 20 is formed with a reduced curvature portion 25 on the first light incident portion 221 side where the LD light is incident, so that the LD light can be incident on the LED light. It is possible to reliably carry out light emission not in the portion 22 side (region X) but in a region (region Y) separated from the light incident portion 22 side.

  The curving portion 25 may be formed at least on the light incident portion side where the LD light is incident on the light guide 20, but the entire light guide 20 may be the curving portion 25. Further, as illustrated in the above embodiment, the reduced curvature portion 25 does not necessarily have to be linear, and may have a shape in which the curvature is reduced. As described above, the condensing LD light is also emitted by being incident on the inner surface reflection portion 23. Therefore, if a large curved portion is formed mainly in a region where the LED light is responsible for light emission, the LD light is incident on the inner surface reflecting portion 23 in this region, so the idea of the present invention is not realized well. Therefore, in other words, it is preferable that the curving portion 25 has a linear shape or a curved shape in which the LD light does not enter the inner reflection portion 23 in the region on the light incident portion side where the LED light is responsible for light emission. In addition, about the shape and formation area | region of the curving part 25, the above-mentioned is an example, Comprising: Various deformation | transformation may be made | formed based on the knowledge of those skilled in the art by the area | region X and LED design which LED light takes charge of light emission.

  In addition, according to the present embodiment, since the entire light guide 20 can be caused to emit light uniformly with the one-side light source, it is not necessary to arrange any light source at the other end 24 of the light guide 20. This is suitable when the light source can be installed only on one side of the light guide 20 in the lamp space, and the degree of freedom in designing the lamp 1 is increased.

  Moreover, since it is not necessary to arrange a light source on the other end 24 side of the light guide 20, there is no need to arrange an extension member 6 for hiding the light source on the other end 24 side. For this reason, the other end portion 24 of the light guide 20 can be seen to emit light floating in the air in the lamp chamber S when the lamp is viewed from the front.

(Second Embodiment)
FIG. 3 is a front view of a lamp according to the second embodiment. In the second embodiment, the same reference numerals are given to the same elements as those in the first embodiment. This embodiment is a suitable example in the case where the light guide 20 is a light guide plate having an emission surface formed in a planar shape.

  As shown in FIG. 3, the lamp 1 according to the second embodiment is a tail and stop lamp. FIG. 3 shows a state in which the lamp 1 mounted on the right side of the rear part of the vehicle is viewed from the front, and the description of the lamp body 2 and the front cover 4 is omitted. In the following, the front, back, left, right, front and rear are represented with reference to the state (front view of FIG. 3) of the lamp 1 mounted on the vehicle. In addition, the arrow of a figure represents a part of light ray.

  The lamp 1 according to the present embodiment includes a light source 10 and a light guide 20.

  In the present embodiment, the light guide 20 is a planar optical member, and is formed by injection molding a transparent resin such as acrylic or polycarbonate. As shown in FIG. 3, the light guide 20 has a substantially triangular emission surface and is formed in a design shape that becomes thinner toward the right side. The left side surface of the light guide 20 is the light incident portion 22. The left side of the light guide 20 is formed to be gradually reduced toward the left so that the light incident part 22 substantially coincides with an emission region of the light source 10 described later.

  The “plane shape” means various shapes such as a rectangular shape and a disk shape, and has a light emitting surface (light emitting surface) as compared with a rod shape. The planar light guide 20 is not limited to a flat plate shape, but includes a curved shape. In the light guide 20 of the present embodiment as well, as described in the first embodiment, the light incident portion 22 side has a reduced curvature portion 25 (the light incident portion 22 side has a flat plate shape or LD light on the inner surface. It is preferable that a curved shape that does not easily enter the reflecting portion 23) and / or a shape that does not have a concave shape that prevents the LD light from traveling straight is preferably formed.

  On the rear side surface of the light guide body 20, an inner surface reflection portion 23 made up of a plurality of conical steps (so-called dot cuts) is formed on the entire rear side surface of the light guide body 20. The inner surface reflection portion 23 reflects a part of the light guide traveling in the light guide 20 toward the front. Also here, the inner surface reflection portion 23 is formed by engraving a shape for light diffusion such as grooves, wrinkles, dot printing, a reflection film, or by dispersing a scattering agent inside the light guide 20 at the time of molding. May be. The light guide 20 guides the light incident from the light incident portion 22 inside, and is reflected by the inner surface reflection portion 23 formed on the rear side surface of the light guide 20, and from the front side of the light guide 20 to the front of the lamp. Exit toward

  As shown in FIG. 3, the light source 10 is constituted by an integrated light source module in which an LED module 12 and an LD module 16 are integrated. The light source 10 in FIG. 3 is illustrated in a longitudinal section to illustrate the inside of the light source 10. The individual configurations and emission colors of the LED module 12 and the LD module 16 are the same as those in the first embodiment. In the light source 10 that is an integrated light source module, two LED modules 12 are fixed to a can cap of the LD module 16. Each LED module 12 is fixed up and down on the outer surface of the side surface having the fluorescent layer of the can cap with the fluorescent layer interposed therebetween. The number of LED modules 12 and the fixed positions may be changed as appropriate.

  The LD module 16 to which the LED module 12 is fixed is fixed to a heat sink (not shown). Heat generated from the LD element is radiated well by the heat sink. Heat generated from the LED chip is well radiated by the heat sink through the metallic can cap. The light source 10 that is an integrated light source module is disposed with respect to the light incident portion 22 of the light guide 20 so that the optical axes of the LED modules 12 and the LD modules 16 are orthogonal to the side surfaces of the light incident portion 22. An extension member (not shown) disposed between the light source 10 and the front cover 4 is disposed in front of the light source 10 in the lamp chamber S, and the structure of the light source 10 is concealed.

  The LED light that has entered the light guide 20 from two places above and below the light incident portion 22 is guided while being well diffused in the light guide 20 and reflected by the inner surface reflection portion 23 on the light incident portion 22 side. The upper and lower regions on the light incident part 22 side of the light guide 20 are mainly caused to emit light (illustrated by thin oblique lines as region X in FIG. 3).

  On the other hand, the LD light incident on the light guide 20 from the central portion of the light incident portion 22 travels well in the light guide 20 and is substantially incident on the inner surface reflection portion 23 of the region X that the LED light is responsible for. Without being reflected, the light is reflected and diffused by the right side surface (the other side surface) 24 of the light guide 20, and then reflected by the inner surface reflection portion 23, so that the central region of the light guide and the region on the other side surface 24 side (light incident). The region far from the portion 22 is mainly caused to emit light (illustrated as a region Y in FIG. 3 by a cross line).

  As described above, according to the present embodiment, even with the planar light guide 20, the LED light having a relatively high diffusibility and the LD light having a relatively high light condensing property with respect to the one side surface 22. Can be made to emit light uniformly with the light source on one side.

  Also in this embodiment, since it is not necessary to arrange a light source on the other side surface (right side surface) 24, the lamp 1 has a high degree of design freedom, and the other side surface 24 has a lamp chamber in front view of the lamp. Luminous appearance like floating in S is obtained.

  The present invention is not limited to the above-described embodiments, and the embodiments can be combined or the following modifications can be added based on the knowledge of those skilled in the art. It is included in the scope of the present invention.

(Modification 1)
FIG. 4 is a partially enlarged view of a clearance lamp according to a modification of the first embodiment. In addition, the arrow of a figure represents a part of light ray. The clearance lamp D according to the first embodiment may be modified as follows. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In the clearance lamp D shown in FIG. 4, an integrated light source module is used as the light source 10. In the light source 10, the LED module 12 is fixed in a 2 × 2 matrix form with respect to the outer surface of the side surface having the fluorescent layer of the can cap of the LD module 16 around the position of the fluorescent layer. The light guide 20 shown in FIG. 4 is rod-shaped and has a substantially circular cross section. The light incident part 22 is not branched and is formed as one incident part. Between the light incident part 22 and the light guide body 21, the light incident part 22 is larger than the diameter of the light guide body 21. A condensing part 26 is formed which has a truncated cone shape whose diameter gradually increases toward the light source and is formed in a cylindrical shape on the light incident part 22 side. Thereby, the diffusive LED light from each LED module 12 can be favorably guided to the light guide body 21.

(Modification 2)
In each of the embodiments described above, the LD module 16 and the LED module 12 are configured to emit white light, but may be modified to emit other colors. For example, the LD module 16 and the LED module 12 may emit red light or amber, and the lamp 1 may be configured as a tail and stop lamp or a turn signal lamp. Alternatively, the light emission colors of the LD module 16 and the LED module 12 may be different. For example, if the LD module 16 emits blue light and the LED module 12 emits white light, the light guide 20 emits white in the region X on the light incident portion 22 side that the LED is responsible for, The region Y on the other end 24 side emits light in blue as it moves away from the light incident part 22, so that gradation light emission that gradually shifts from white to blue becomes possible, and the design of the light guide 20 can be improved.

DESCRIPTION OF SYMBOLS 1 Lamp 10 Light source 12 LED module 16 LD module 20 Light guide 21 Light guide main body 22 Light incident part 221 1st light incident part 222 2nd light incident part 23 Inner surface reflection part 24 The other edge part 25 Decreasing part 26 Condensing part

Claims (5)

To the light guide that receives light from the light incident part that is one end or one side, guides the light inside, and emits light forward by reflection by the internal reflection part,
A lamp characterized in that light from a laser diode and a light emitting diode is incident as the light source light.   2. The light guide according to claim 1, wherein at least the light incident portion side where the light of the laser diode is incident has a reduced curvature portion where the light of the laser diode is not incident on the inner reflection portion. The listed lamp.   The said light incident part has the 1st light incident part into which the light of the said laser diode injects, and the 2nd light incident part in which the light of the said light emitting diode is incident, The 1st or 2 characterized by the above-mentioned. Lamps described in   The said laser diode and the said light emitting diode are contained in an integrated light source module, and have a condensing part between the main body of the said light guide, and the said light-incidence part, The Claim 1 or 2 characterized by the above-mentioned. Light fixture. The lamp according to any one of claims 1 to 4, wherein the laser diode and the light emitting diode emit light in different colors.

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