JP2015046357A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of illuminating a ceiling or a wall that is an installation surface with light even if a directional light source such as an LED is used.SOLUTION: According to an embodiment, a lighting device includes: a light source 4 arranged linearly on a support surface of a support and having directivity in a normal direction of an emission surface; and a linear cover 5 covering the light source 4. The cover 5 includes: a first cover 6 located inward with respect to the light source 4 and having high transmittance; and a second cover 7 located outward with respect to the light source 7 and having lower transmittance than that of the first cover 6. In a cross-section of the cover 5 in a width direction, the first cover 6 and the second cover 7 are distanced from each other in at least a front surface area opposing the light source 4, and the first cover 6 and the second cover 7 contact each other in both edge areas in the width direction, thereby providing a hollow space surrounded by the first cover 6 and the second cover 7. The first cover 6 captures a part of light obliquely released in a side surface direction of the light source 4 out of light released from the light source 4, and emits the captured light in a range from the side surface direction to a rear surface direction of the light source 4.

Description

  Embodiments described herein relate generally to a lighting device.

  As a lighting device, a linear lighting device including a fluorescent lamp is widely used. In recent years, lighting devices using light emitting diodes (LEDs), which have less environmental impact than fluorescent lamps, have started to appear, and many linear lighting devices have been released (Patent Documents 1 and 2).

  A conventional fluorescent lamp emits light with a uniform luminous intensity in all directions, but an illumination device using a light source that emits light only in front of the mounting surface, such as an LED, is an illumination device using a conventional fluorescent lamp. When it is replaced, the ceiling surface cannot be illuminated and it is easy to receive an impression that it has become dark. For this reason, the illuminating device which irradiates a part of light which goes ahead to a side surface direction is disclosed (patent document 3).

JP 2013-69879 A JP 2013-186095 A JP 2013-58316 A

  However, in an illuminating device using a light source that irradiates light strongly in the normal direction of the mounted surface typified by an LED, compared to a conventional illuminating device using a fluorescent lamp, the back side of the installation surface, that is, the ceiling There is a problem that the surface or wall surface becomes dark.

  The present invention has been made in view of the above points, and the problem is that even when a directional light source such as an LED is used, the ceiling or wall side that is the installation surface can be strongly irradiated. To provide an apparatus.

  According to the embodiment, the illumination device includes a light source that is linearly arranged on the support surface of the support and has directivity in the normal direction of the emission surface, and a linear cover that covers the light source. . The cover includes a first cover having a high transmittance which is on the inner side with respect to the light source, and a second cover having a lower transmittance than the first cover which is on the outer side with respect to the light source. The cross section of the cover in the width direction orthogonal to the longitudinal direction is such that the first cover and the second cover are spaced apart from each other at least in a front region facing the light source, and the first and second cover regions in the width direction are separated from each other. The first cover and the second cover are in contact with each other so that a hollow space surrounded by the first cover and the second cover is provided. The first cover captures a part of the light emitted from the light source so as to be inclined in the side surface direction of the light source and emits the light from the side surface direction to the back surface direction of the light source.

FIG. 1 is a cross-sectional view illustrating a lighting device according to a first embodiment. FIG. 2 is a diagram showing a ray trajectory emitted from the illumination device. FIG. 3 is a view showing a light distribution of the lighting device when there is no ceiling or wall surface. FIG. 4 is a cross-sectional view showing a lighting device according to a second embodiment. FIG. 5 is a view showing a ray trajectory emitted from the illumination device according to the second embodiment. FIG. 6 is a diagram showing a light distribution of the lighting device when there is no ceiling or wall surface. FIG. 7 is a cross-sectional view illustrating a lighting device according to a third embodiment. FIG. 8 is a cross-sectional view illustrating a lighting device according to a fourth embodiment. FIG. 9 is a cross-sectional view illustrating a lighting device according to a fifth embodiment.

Hereinafter, the illumination device according to the embodiment will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view of the illumination device according to the first embodiment.
The lighting device 1 uses an LED light source instead of a conventional fluorescent lamp, and has a shape in which the cross-sectional structure shown in FIG. That is, the illuminating device 1 includes a housing 2 having a rectangular cross section serving as a support, a plurality or one continuous substrate 3 installed on a support surface 2 a of the housing 2, and a housing 2 mounted on the substrate 3. A light source 4 composed of LEDs arranged in a straight line in the longitudinal direction of the light source, a long and thin linear cover 5 attached to the support surface 2a of the housing 2 and covering the substrate 3 and the light source 4, and a housing 2 And a drive circuit 8 for driving the light source 4.

  The housing 2 is configured by bending a white-coated steel plate, supports the light source 4 on the support surface 2a, and supports the drive circuit 8 therein. The illuminating device 1 is installed by attaching or embedding the casing 2 to the ceiling 10 or the wall surface. Thereby, the support surface 2a of the housing | casing 2 is located in parallel with a ceiling or a wall surface.

  The cover 5 includes a first cover 6 having a high transmittance inside the light source 4 and a second cover 7 positioned outside the light source 4 and having a transmittance lower than that of the first cover. The first cover 6 on the light source 4 side is made of, for example, a transparent polycarbonate resin, and the second cover 7 on the outer side thereof is made of, for example, a milky white polycarbonate resin. In the present embodiment, the first and second covers 6 and 7 are integrally formed by extrusion molding.

  The first cover 6 is formed in a plate shape facing the support surface 2a of the housing 2 and the light source 4, and has a concave lens structure with a small curvature (or negative curvature) on the outside and a large curvature on the inside with respect to the light source 4. doing. That is, the inner surface of the first cover 6 has an incident portion 6 a made of an arcuate recess facing the light source 4 and a pair of protruding regions 6 b arranged on both sides in the width direction of the light source 4. . Each protruding region 6 b protrudes to a height in the vicinity of the light source 4 and takes light emitted from the light source 4 in the side surface direction into the first cover 6. The projecting region 6 b has a pair of inclined surfaces extending in an inclined direction away from the light source 4, and the inclined surfaces are opposed to the emission part of the first cover 6 with a gap. The upper surface of the first cover 6 opposite to the light source 4 forms a concave surface 6c with a small curvature. Furthermore, both side edges of the first cover 6 in the width direction (direction perpendicular to the longitudinal direction of the lighting device) Y are supported on the support surface 2 a of the housing 2 and taken into the first cover 6. The light emission part which radiate | emits light to the side thru | or a back side is comprised. The exit surface 6d of the exit part extends from the support surface 2a of the housing 2 so as to be inclined to the side so that the normal direction thereof is inclined to the side surface side or the back surface side of the light source 4.

  The second cover 7 includes a substantially flat front region 7a facing the concave surface 6c of the first cover 6 with a gap, and a width direction end portion of the concave surface 6c of the first cover 6 from both ends in the width direction Y of the front region 7a. And a side surface region 7b extending inclined toward the light source 4 side. The exit surface of the side surface region 7 b forms a side surface that is continuous with the exit surface 6 d of the first cover 6 to a height that is directly irradiated by the concave lens of the first cover 6. The light irradiated from the concave surface 6 c of the first cover 6 is irradiated to the entire front area 7 a of the second cover 7.

  As described above, the cross section of the cover 5 in the width direction Y is such that the first cover 6 and the second cover 7 are spaced apart from each other at least in the front region facing the light source 4 and the first cover is formed in both side edge regions in the width direction. 6 and the second cover 7 are in contact with each other so that a hollow space surrounded by the first cover and the second cover is provided. The first cover 6 has an emission part that takes in a part of the light emitted from the light source 4 so as to be inclined mainly in the side surface direction and emits the light from the side surface direction to the back surface direction of the light source. ing.

  The light emitted from the light source 4 (arrow in the figure) is enlarged by the concave lens of the first cover 6 in the front direction of the light source 4, and the whole area of the front area 7 a, which is a flat portion of the second cover 7, emits light uniformly and with uniform brightness. Let At the same time, the first cover 6 takes light inclined in the side surface direction of the light source 4 into the first cover 6, and emits light from the side surface direction to the back surface direction from the side surface to the illumination device 1.

  That is, the second cover 7 made of milky white material and the first cover 6 having a concave lens function eliminate unevenness in the granularity of the particles specific to the LED of the light source 4 and brightly illuminate the ceiling surface or wall surface with the first cover 6. be able to.

  Further, the side surface of the cover 5 has a shape in which the surface normal direction is directed to the ceiling side or the wall surface side and is difficult to be visually recognized when looking up at the ceiling. For this reason, the illuminating device 1 has an appearance that the adjacent ceiling surface or wall surface looks bright by the light emitted from the emission region of the second cover 6 that cannot be seen, adjacent to the front region that shines uniformly.

FIG. 2 shows the ray trajectory emitted from the lighting device 1, and FIG. 3 shows the light distribution of the lighting device 1 when there is no ceiling or wall.
From these figures, it can be seen that on the side surface of the cover 5, the light collected by the first cover 6 is irradiated from the exit surface 6 d to the ceiling side or the wall surface side. Further, it can be seen that on the center side of the cover 5, the light emitted from the light source 4 is diffused by the first cover 7 and appears to emit light with the width of the cover 5 in appearance.

  According to 1st Embodiment comprised as mentioned above, while using the light source 4 with strong directivity, while irradiating a ceiling or a wall surface, the illuminating device which can reduce glare can be implement | achieved. it can.

  In the first embodiment, the light sources 4 are not limited to one row, but may be arranged in a plurality of straight rows, or the row arrangement shape may be a circle. Further, another type of light source such as an organic EL may be used as the light source 4. The housing 2 is not limited to a rectangular cross section, and may have another shape. The cover may be formed of an acrylic resin or other materials, and the transparent region may have a slight diffusivity if the diffusibility is weaker than the milky white region. In the first embodiment, the second cover has a pair of side regions. However, the side regions may be appropriately disposed and may be omitted. In this case, you may make it join the both ends of the front area of a 2nd cover directly to the width direction edge part of a 1st cover.

  Next, various other embodiments will be described. In the various embodiments described below, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different parts will be described in detail mainly.

(Second Embodiment)
FIG. 4 is a cross-sectional view showing the lighting device 1 according to the second embodiment. In the second embodiment, the basic configuration of the illumination device 1 is the same as that of the first embodiment.

  According to the present embodiment, the first cover 6 has a thin light guide portion so that light incident from the light source 4 is reflected and guided twice or more and emitted from the emission surface 6d to the ceiling side or the wall surface side. ing. Thereby, the 1st cover 6 can be made thin and thickness reduction of the whole cover 5 can be attained.

FIG. 5 shows the ray trajectory emitted from the lighting device 1, and FIG. 6 shows the light distribution of the lighting device 1 when there is no ceiling or wall.
From these figures, it can be seen that on the side surface of the cover 5, the light collected by the first cover 6 is irradiated from the exit surface 6 d to the ceiling side or the wall surface side. Further, it can be seen that on the center side of the cover 5, the light emitted from the light source 4 is diffused by the first cover 7 and appears to emit light with the width of the cover 5 in appearance.

  Also in the second embodiment having the above-described configuration, it is possible to realize an illumination device that can irradiate a ceiling or a wall surface using a light source 4 with high directivity and can reduce glare.

(Third embodiment)
FIG. 7 is a cross-sectional view showing the lighting device 1 according to the third embodiment. In 3rd Embodiment, the basic composition of the illuminating device 1 is the same as that of 1st Embodiment.

  According to the present embodiment, the housing 2 serving as a support is formed in a trapezoidal cross section, and the mounting substrate 3 and the light source 4 are provided on the truncated top surface serving as the support surface 2a. The second cover 7 of the cover 5 has a front region 7a formed in a dome shape and both side surface regions (side portions) 7b. Both side surface portions 7 b are provided so as to cover the emission surface 6 d of the first cover 6.

  The light emitted from the emission surface 6d by the prism action of the first cover 6 is diffused and emitted from the side surface portion 7b of the second cover 7 made of milky white material, thereby causing striped unevenness due to the refractive difference for each color of light. Can be eliminated.

  The first cover 6 and the second cover 7 are integrally molded without an air layer interposed therebetween by extrusion molding. Therefore, Fresnel reflection due to the difference in refractive index does not occur at the boundary between the two, and the efficiency is hardly deteriorated.

  Although the second cover 7 has an arc shape and the housing 2 has a trapezoidal shape and design, these can be variously modified within a range that does not hinder the function.

(Fourth embodiment)
FIG. 8 is a cross-sectional view illustrating the lighting device 1 according to the fourth embodiment. The basic configuration of the illumination device 1 is the same as that of the first embodiment.

  According to this embodiment, the housing | casing 2 is formed in cross-sectional trapezoid shape, and the mounting substrate 3 and the light source 4 are provided in the truncated top surface part used as the support surface 2a. The emission region of the first cover 6 extends along two inclined side surfaces 2b of the housing 2 and is provided so as to cover these two side surfaces.

  As a result, the light taken into the first cover 6 from the light source 4 is guided through the first cover 6, and light is widely emitted to both side surfaces 2 b or the ceiling surface of the housing 2.

(Fifth embodiment)
FIG. 9 is a cross-sectional view showing the lighting device 1 according to the fifth embodiment. The basic configuration of the illumination device 1 is the same as that of the first embodiment.

  According to this embodiment, the housing | casing 2 is formed in cross-sectional trapezoid shape, and the mounting substrate 3 and the light source 4 are provided in the truncated top surface part used as the support surface 2a. The emission region of the first cover 6 extends along two inclined side surfaces 2b of the housing 2 and is provided so as to cover these two side surfaces. The side surface portion 7b of the second cover 7 extends along the emission area of the first cover 6 and is provided so as to cover the emission surface of these emission areas. The cross-sectional shape of the second cover 7 is configured to be a continuous triangle as a whole.

  According to the above configuration, the light taken into the first cover 6 from the light source 4 is diffused and emitted to the outside by the side surface portion 7b of the second cover 7 in contact with the emission surface 6d on both side surfaces 2b of the housing 2. Light is emitted around the side surface 2 b of the housing 2.

  Even in the third to fifth embodiments configured as described above, an illumination device capable of irradiating the ceiling or the wall surface and reducing the glare even when the light source 4 having high directivity is used is realized. be able to.

The present invention is not limited to the above-described embodiments and modifications as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
In the above-described embodiment, the linear illumination device has been described. However, as long as the light source array is linear, the illumination device may be a circle shape, an arc shape, or another curved shape.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Housing | casing, 3 ... Board | substrate, 4 ... Light source, 5 ... Cover, 6 ... 1st cover,
6b ... projecting area, 6d ... emitting surface, 7 ... second cover, 7a ... front area, 7b ... side area

Claims (8)

A light source linearly disposed on the support surface of the support and having directivity in the normal direction of the exit surface, and a linear cover covering the light source,
The cover includes a first cover having a high transmittance that is on the inner side with respect to the light source, and a second cover having a lower transmittance than the first cover that is on the outer side with respect to the light source,
The cross-section of the cover in the width direction orthogonal to the linear longitudinal direction is such that the first cover and the second cover are spaced apart from each other at least in a front region facing the light source, and both side edges in the width direction A hollow space surrounded by the first cover and the second cover by contacting the first cover and the second cover in a region;
The first cover captures a part of the light emitted from the light source so as to be inclined in the side surface direction of the light source, and emits the light from the side surface direction to the back surface direction of the light source. Lighting device.   2. The first cover comprises a concave lens that expands and emits a part of the light emitted in the front direction of the light source out of the light emitted from the light source. The lighting device described in 1. The second cover has a front region in which the surface normal direction faces the front side and faces the first cover with a gap,
The illumination device according to claim 2, wherein the light irradiated from the concave lens of the first cover is irradiated to the entire front region of the second cover.   The first cover is provided on both sides in the width direction of the light source, and protrudes to a height in the vicinity of the light source, and includes projecting regions for capturing light emitted from the light source in a side surface direction. Item 4. The lighting device according to any one of Items 1 to 3.   The lighting device according to any one of claims 1 to 4, wherein the first cover and the second cover are integrally formed.   The lighting device according to claim 1, wherein the emission surface of the first cover and the side surface portion of the second cover have emission surfaces whose normal direction is directed to the ceiling side.   The lighting device according to claim 1, wherein an emission surface of the first cover is exposed to the outside.   The lighting device according to claim 1, wherein the second cover includes a side surface portion that covers an emission surface of the first cover.

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