JP2015111541A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of attaining a uniform emission quantity of light in a longitudinal direction even if a light guide element has a long shape, exhibiting an appropriate illumination effect, and ensuring excellent user-friendliness.SOLUTION: A lighting device 2 includes: a light guide element 6 having a long shape, including an incident surface 3 on an end, and including an output surface 4 and a reflection surface 5 on an outer peripheral surface in a longitudinal direction; and a light source 7 arranged opposed to the incident surface 3 of the light guide element 6, a diffusion section 8 being provided on the reflection surface 5, the diffusion section 8 having a long shape extending from the incident surface 3 in a direction of being away from this incident surface 3, and a width of the diffusion section 8 in a direction orthogonal to the extension direction being gradually increased from the incident side 3 in the extension direction.

Description

  The present invention relates to a lighting device including a light guide having a long shape and having an entrance surface and an exit surface.

  In recent years, lighting devices using light guides have been proposed and are in the limelight.

  In this type of lighting device, a light guide having a long shape and an entrance surface at the end, an exit surface and a reflection surface on the outer peripheral surface in the longitudinal direction, and a light source disposed facing the entrance surface of the light guide And the reflection surface is provided with a diffusing portion (for example, see Patent Document 1 below).

JP 2006-148956 A

  In this type of lighting device, when the light source is energized, the light from the light source enters from the incident surface of the light guide, and then the light is guided in the longitudinal direction through the reflecting surface. However, it radiates | emits from the output surface by diffusing by the spreading | diffusion part provided in the reflective surface of the said light guide. That is, light is emitted from the emission surface in the longitudinal direction of the long light guide.

  The problem with such an illuminating device is that the amount of light emitted from the long light guide becomes non-uniform in the longitudinal direction, resulting in a problem that an appropriate lighting effect cannot be obtained, which makes it unusable. Met.

  That is, in the long light guide, the light amount decreases as it goes away from the incident surface, so that the amount of light emitted from the output surface far from the incident surface decreases, and as a result, the light emission amount in the long light guide However, it becomes non-uniform in the longitudinal direction, resulting in a problem that an appropriate lighting effect cannot be obtained, resulting in poor usability as a lighting device.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an illuminating device that is easy to use because the amount of emitted light is uniform in the longitudinal direction even with a long light guide and an appropriate illumination effect is obtained.

  In order to achieve the above object, a lighting device according to the present invention has a long shape, a light guide having an incident surface at an end, an output surface and a reflective surface on an outer peripheral surface in a longitudinal direction, and the light incident surface of the light guide A light source disposed opposite to the light source, and a diffusion part is provided on the reflection surface, and the diffusion part is extended on the reflection surface in a direction away from the light incident surface. The lateral width in the direction perpendicular to the extending direction of the diffusion portion is increased from the incident surface side toward the extending direction side.

  In the illuminating device of the present invention, the lateral edge in the direction orthogonal to the extending direction of the diffusing portion is directed from the incident surface side toward the extending direction side by forming the side edge of the diffusing portion continuously inclined. It is preferable to enlarge.

In the illuminating device of the present invention, incident surfaces are provided on both end surfaces of the light guide, and the light sources are provided to face both the incident surfaces, respectively. You may reduce toward the both entrance planes from the both sides.

  Moreover, in the illuminating device of this invention, you may form the said spreading | diffusion part on the outer surface side of the said reflective surface by printing.

  In this case, it is preferable that the diffusing portion has a scattered printing region that is applied so that the printing is scattered in the form of dots at both side edge portions along the longitudinal direction.

  Moreover, in the illuminating device of this invention, the elongate light emission surface extended in the longitudinal direction of this light guide is formed in a part of outer peripheral surface of the said light guide, and the said light guide facing this light emission surface You may provide the said spreading | diffusion part in the part of the outer peripheral surface of a body.

  In this case, it is preferable that a portion of the outer peripheral surface of the light guide facing the emission surface is formed as a convex surface or a concave surface so that the diffusion portion is curved in a direction orthogonal to the extending direction.

  In this case, it is preferable that the diffusing portion is formed so as to continuously extend from a portion of the outer peripheral surface of the light guide opposed to the emission surface to the side.

  In the illuminating device of the present invention, even if it is a long light guide, the amount of emitted light is uniform in the longitudinal direction, and an appropriate illumination effect can be obtained, making it easy to use.

The perspective view which shows the state which attached the illuminating device of one Embodiment of this invention to the ceiling part. The perspective view which shows the whole external appearance of an illuminating device same as the above. The perspective view which shows the light source part of an illuminating device same as the above. (A) is a perspective view showing a light guide body of the illumination device same as above, (b) is a top view showing a light guide body of the illumination device same as the above, and (c) is an enlarged view showing a portion A in (b). Side view showing the light guide of the illumination device Upper enlarged side view showing another example of the light guide of the illumination device same as above Upper enlarged side view showing still another example of the light guide of the illumination device same as above Upper enlarged side view showing still another example of the light guide of the illumination device same as above

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a bathroom, and a lighting device 2 is installed on the ceiling.

  As shown in FIGS. 2 and 4, the illuminating device 2 includes a light guide 6 having a long shape, an entrance surface 3 at both ends, and an exit surface 4 and a reflection surface 5 on the outer peripheral surface in the longitudinal direction, and the light guide. 3 and the light source 7 of FIG.

  The exit surface 4 is arranged in the bathroom 1, and the entrance surface 3, the reflection surface 5, and the light source 7 of the lighting device 2 cannot be confirmed from the bathroom 1. Here, the lighting device 2 includes a milky white cover 21 inside the bathroom 1, and the emission surface 4 cannot be seen from the bathroom 1.

The light guide 6 is formed by extruding a transparent synthetic resin, for example, and as shown in FIGS. 4 and 5, the incident surface 3 shows a cross-sectional shape cut in a direction perpendicular to the longitudinal direction. In addition, it is a quadrangle that is long in the vertical direction, and the upper part is a curved surface having a substantially arc shape (however, only the upper surface is shown in FIG. 5).
The lower portion is a curved surface that is convex upward, and the lower curved surface is the exit surface 4.

  Further, a protrusion 51 protruding outward is formed along the longitudinal direction in the middle in the vertical direction of both side surfaces of the light guide 6. In this case, the cross-sectional shape of the protrusion 51 is substantially triangular, its upper side surface is inclined outward and downward, its lower side surface is substantially horizontal, and this lower side surface serves as the reflecting surface 5 to diffuse light 8. Reflect toward (described later). That is, by forming the protrusion 51, the light is easily reflected toward the diffusion portion 8 (described later).

  As shown in FIG. 3, two light sources 7 are arranged on the top and bottom, and the two light sources 7 are arranged opposite to the incident surfaces 3 at both ends of the light guide 6. As the light source 7, for example, a point light source such as an LED is employed.

  The feature of this embodiment is that the diffusing portion 8 is formed by printing (ink) in a portion that becomes the reflecting surface 5 in the upper part facing the emitting surface 4 of the light guide 6 as shown in FIG. In this case, among the outer peripheral surfaces of the light guide 6, the lower surface is the emission surface 4, and the other upper surface and both side surfaces are the reflection surfaces 5. Is formed.

  As understood from FIG. 4, the diffusing portion 8 has a long shape extending from the incident surface 3 side in a direction away from the incident surface 3 on the reflecting surface 5 of the elongated light guide 6. The lateral width in the direction orthogonal to the extending direction of the diffusing portion 8 is enlarged from the incident surface 3 side toward the extending direction side of the diffusing portion 8. Here, both side edges of the diffusing portion 8 are continuously inclined so that the lateral width of the diffusing portion 8 increases as the distance from the incident surface 3 increases, but only one side edge of the diffusing portion 8 is inclined. The shape may be sufficient, and the lateral width of the diffusion part 8 may be enlarged stepwise as it moves away from the incident surface 3.

  However, in the present embodiment, the incident surfaces 3 are provided on both end surfaces of the light guide 6 and the light sources 7 are provided so as to face the respective incident surfaces 3. The shape is reduced from the middle of 6 toward both sides toward the incident surface 3 on both ends.

  Moreover, as shown in FIG.4 (c), the spreading | diffusion part 8 has the scattered printing area | region 81 applied so that printing might be scattered in the shape of a dot at the both-sides edge part along the longitudinal direction. The light guide 6 is extruded, and the diffusion portion 8 is also formed in this extrusion process. That is, in the extrusion molding process, the diffusion portion 8 is formed by printing with ink on the surface of the light guide 6 to be extruded, and at that time, the scattered printing region 81 is also formed by the scattered ink.

  Here, the diffusing portion 8 is formed by printing (ink), but the diffusing portion 8 has a plurality of laser cutting grooves arranged on the reflecting surface 5 at intervals in the longitudinal direction of the light guide 6. May be formed. In this case, the laser cutting groove intersects with the longitudinal direction of the light guide 6 having a long shape so as to intersect or incline, and guides the length of the laser cutting groove in the orthogonal or inclined direction (lateral width direction). By increasing the distance from the incident surface 3 of the light body 6 in the longitudinal direction, the lateral width in the direction orthogonal to the extending direction of the diffusion portion 8 is increased from the incident surface 3 side toward the extending direction side.

As described above, the illuminating device 2 of the present embodiment has a light guide 6 having a long shape, an entrance surface 3 at the end, an exit surface 4 and a reflection surface 5 on the outer peripheral surface in the longitudinal direction, and the light guide 6. And a light source 7 disposed to face the incident surface 3. The reflecting surface 5 is provided with a diffusing portion 8. The diffusing portion 8 has a long shape extending from the incident surface 3 side in the direction away from the incident surface 3 on the reflecting surface 5. The lateral width in the direction orthogonal to the extending direction of 8 is enlarged from the incident surface 3 side toward the extending direction side of the diffusion portion 8. Therefore, even if the light guide 6 is a long light guide 6 and the amount of light decreases as the distance from the incident surface 3 decreases, the amount of light diffused from the diffusion unit 8 increases accordingly. The amount of light emitted from the body 6 is uniform in the longitudinal direction of the diffusing section 8, and an appropriate lighting effect is obtained, which makes it easy to use.

  Moreover, in the illuminating device 2 of this embodiment, since the side edge of the spreading | diffusion part 8 becomes the shape which inclined continuously, since the horizontal width of the spreading | diffusion part 8 becomes large as it distances from the entrance plane 3, it is diffused. The amount of light diffused from the portion 8 continuously increases as the distance from the incident surface 3 increases, and the amount of light emitted from the long light guide 6 becomes more uniform in the longitudinal direction of the diffusion portion 8.

  Moreover, in the illuminating device 2 of this embodiment, since the spreading | diffusion part 8 has the scattered printing area | region 81 given so that printing might be scattered in the shape of a dot in the both-sides edge part along the longitudinal direction, it is diffused. A sufficient light diffusing effect is obtained also at both side edge portions of the portion 8, the amount of emission increases, and the light emission efficiency in the long light guide 6 is improved.

  In the above-described embodiment, the elongated light exit surface 4 extending in the longitudinal direction of the light guide 6 is formed on a part of the outer peripheral surface of the light guide 6, and the light guide facing the light exit surface 4 is formed. A diffusion portion 8 is provided on the outer peripheral surface of the light body 6. In this case, as shown in FIG. 5, the portion facing the emission surface 4, which is the lower surface of the light guide 6, that is, the upper portion is a flat surface, and the diffusion portion 8 shown in FIG. 4 is provided here. In order to expand the area of the light guide in the direction orthogonal to the longitudinal direction, the diffusion portion 8 is formed so as to continuously extend from the outer peripheral surface portion of the light guide 6 facing the emission surface 4 to the side. Is preferred. For example, as shown in FIG. 6, the diffusing portion 8 may be provided continuously downward so as to extend from the upper part to the side surface of the light guide 6.

  Furthermore, in order to expand the area of the diffusing portion 8 in a direction perpendicular to the longitudinal direction, the portion of the outer peripheral surface of the light guide 6 facing the emission surface 4 is arranged in a direction in which the diffusing portion 8 is orthogonal to the extending direction. It is preferable to form it so as to be curved. For example, as shown in FIG. 7, a convex surface 9 may be provided on the outer peripheral surface portion (upper part) facing the emission surface 4 of the light guide 6, and a diffusion portion 8 may be provided here, or as shown in FIG. 8. The concave surface 10 may be provided on the outer peripheral surface portion (upper part) facing the light exit surface 4 of the light guide 6, and the diffusion portion 8 may be provided here.

  Of course, in FIGS. 7 and 8, the diffusing portion 8 may be formed up to a portion of the convex surface 9 or the concave surface 10 beyond the direction perpendicular to the longitudinal direction of the diffusing portion 8 (see FIG. 6).

  Note that the diffusion portion 8 is not limited to formation by printing (ink) or laser cutting, and may be formed by surface mat treatment by sandblasting, knurling, file (sandpaper), or the like.

DESCRIPTION OF SYMBOLS 1 Bathroom 2 Illuminating device 21 Cover 3 Incident surface 4 Outgoing surface 5 Reflecting surface 51 Projection 6 Light guide 7 Light source 8 Diffusion part 81 Scatter printing area 9 Convex surface 10 Concave surface

Claims (8)

A light guide having a long shape and having an entrance surface at an end, an exit surface and a reflection surface on an outer peripheral surface in a longitudinal direction, and a light source disposed to face the entrance surface of the light guide, and the reflection surface Has a diffusion part,
The diffusing portion has a long shape extending from the incident surface side in a direction away from the incident surface on the reflecting surface, and a lateral width in a direction perpendicular to the extending direction of the diffusing portion is from the incident surface side. A lighting device expanded toward the extension direction.   The lateral width in the direction orthogonal to the extending direction of the diffusing part is increased from the incident surface side toward the extending direction side by forming the side edges of the diffusing part continuously inclined. The lighting device described.   The light guides are provided with incident surfaces on both end faces, and the light sources are provided to face both of the light incident faces. The lateral width of the diffusing portion extends from the middle of the light guide to both sides. The lighting device according to claim 1, wherein the lighting device is reduced toward the front.   The illuminating device according to claim 1, wherein the diffusing portion is formed on the outer surface side of the reflecting surface by printing.   The illuminating device according to claim 4, wherein the diffusing portion has scattered printing regions provided on both side edge portions along the longitudinal direction so that the printing is scattered in a dotted manner.   A long exit surface extending in the longitudinal direction of the light guide is formed on a part of the outer periphery of the light guide, and the diffusion is performed on the outer periphery of the light guide facing the exit surface. The lighting device according to any one of claims 1 to 5, wherein a portion is provided.   The illumination device according to claim 6, wherein a portion of the outer peripheral surface of the light guide facing the emission surface is formed as a convex surface or a concave surface so that the diffusing portion is curved in a direction orthogonal to the extending direction thereof.   The illuminating device according to claim 6 or 7, wherein the diffusing portion is formed so as to continuously extend laterally from a portion of the outer peripheral surface of the light guide facing the emission surface.

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