JP2014063652A - Illuminating device - Google Patents

Abstract

A flat lamp device capable of irradiating from a side surface to a back surface side is provided.
A lighting device includes a light source unit including a base material, a plurality of light sources mounted at least in the vicinity of the peripheral edge of the front surface of the base material, and an optical cover that covers the light source. A translucent cover 18 that covers and surrounds the front wall 18a facing the light source with a gap, a side wall 18b that covers the periphery of the light source unit and has a maximum diameter portion 20, and a rear wall that covers the back side of the light source unit And a translucent cover including 18c. A light source is arrange | positioned in the position which protrudes in the front wall side rather than the back wall of a translucent cover, and the one part light discharge | released via an optical cover from a light source is discharge | released to the back side. The distance between the maximum diameter portion of the translucent cover and the peripheral portion of the light source unit is Go, the height from the rear wall of the translucent cover to the light emitting end of the light source is Ho, and the interval between the light source and the peripheral portion of the light source unit is Gi, When the height at which the optical cover protrudes forward from the light source is Hi, the relationship of Go / Ho ≦ Gi / Hi is satisfied.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a lighting device such as a bracket light using a directional light source unit such as a light emitting diode (LED).

  As a lighting device, for example, a bracket light installed on a wall includes a light source of an incandescent light bulb and a cylindrical cover that covers the light source, and illuminates the wall surface and its surroundings.

Japanese Patent Laid-Open No. 08-264012

  In recent years, there have been many lighting devices that realize long life and mercury-free by using a light emitting diode (LED) as a light source. However, the light emitted from the LED is strong in the normal direction of the plane on which the LED is mounted, and has a feature that it is difficult for light to be emitted from the side surface to the back side. For this reason, when a light source unit composed of LEDs is used as the light source of the bracket light, there is a problem that even if the light source unit is arranged at the center of the cover, only the front surface of the cover is brightened, the side surface is dark, and the wall surface is naturally darkened. .

  The present invention has been made in view of the above points. An object of the present invention is to provide an illuminating device capable of brightly illuminating a side surface or a wall surface even when a light source unit composed of LEDs is used.

According to the embodiment, the lighting device includes a base material having a front surface, a plurality of light sources that are mounted at least in the vicinity of a peripheral edge of the front surface of the base material and emit light strongly in a normal direction, and an optical cover that covers the light sources And a light-transmitting cover that covers the light source unit so as to surround the light source unit, a front wall that faces the light source with a gap, and a side wall that covers the periphery of the light source unit and has a maximum diameter portion. A translucent cover comprising
The light source is disposed at a position protruding toward the front wall side from the rear side end of the translucent cover, and a part of the light emitted from the light source through the optical cover is on the back side from the light source. The distance between the maximum diameter portion of the translucent cover and the peripheral portion of the light source unit is Go, the height from the rear side end of the translucent cover to the light source is Ho, and the light source and the light source unit It is characterized in that the relationship Ho / Go ≦ Hi / Gi is satisfied, where Gi is the distance from the peripheral edge and Hi is the height at which the optical cover protrudes forward from the light source.

FIG. 1 is a cross-sectional view illustrating a lighting device according to a first embodiment. FIG. 2 is a partially enlarged cross-sectional view for explaining the operation of the light source and the optical cover of the illumination device according to the first embodiment. FIG. 3 is a perspective view showing a light source unit of an illumination apparatus according to a first modification. FIG. 4 is an enlarged cross-sectional view illustrating a part of a light source unit of an illumination apparatus according to a first modification. FIG. 5 is a cross-sectional view showing a light source unit of an illumination apparatus according to a second modification. FIG. 6 is a cross-sectional view showing a light source unit of an illumination apparatus according to a third modification. FIG. 7 is a cross-sectional view showing a light source unit of an illumination apparatus according to a fourth modification. FIG. 8 is a cross-sectional view illustrating a lighting device according to a second embodiment.

Hereinafter, illumination devices according to various embodiments will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view showing a lighting device according to the first embodiment, and FIG. 2 is an enlarged cross-sectional view showing a light source and an optical cover. The illumination device 10 has a flat cylindrical shape, and has a shape obtained by rotating the cross section shown in FIG. 1 with respect to the central axis.

  The illuminating device 10 includes, for example, a circular dish-shaped bottom plate 12 fixed to a wall surface 21, a GX53 standard socket 14 fixed to a substantially central portion of the bottom plate, and a flat disk shape detachably attached to the socket 14. And a translucent cover 18 that is detachably attached to the bottom plate 12 and covers the light source unit 16. The peripheral edge of the bottom plate 12 rises substantially vertically to form a cylindrical support portion 12a, and a screw portion 12b is formed on the inner peripheral surface of the support portion 12a.

  The light source unit 16 is mounted on the flat disk-shaped base material 2 having a flat front surface, a base 3 provided on the base material 2, a substrate 5 disposed on the front surface of the base material, and the substrate 5. A plurality of light sources 4 and an optical cover 6 that is mounted on the substrate 5 and covers the light sources 4. The substrate 2 is made of metal and functions as a heat sink for heat generated by the light source 4.

  The base 3 is formed in a stepped disk shape that fits into the GX 53 type socket 14, and is embedded in the lower surface side of the base 2. The base 3 has a plurality of terminals 3 a that fit into the socket 14, and houses a drive circuit 3 b inside. And this nozzle | cap | die 3 is joined to the socket 14 so that attachment or detachment is possible. The light source 4 is turned on via the substrate 5 by the drive power generated by the drive circuit 3b energized through the terminal 3a. In a state where the light source unit 16 is attached to the socket 14, the front surface of the base material 2 and the substrate 5 are positioned substantially parallel to the bottom plate 12 and the wall surface 21.

  The light source 4 uses an LED and is mounted on the substrate 5. In the present embodiment, the plurality of light sources 4 are arranged in a circle in the vicinity of the peripheral portion of the light source unit 16, that is, the peripheral portion 2 b of the substrate 2. In addition, one light source 4 is mounted at the center of the substrate 5. Each light source 4 emits strong light in the normal direction of the substrate 5, that is, the normal direction of the flat surface, and when the angle from the normal direction is θ, the light intensity in the side surface direction is weak in proportion to cos θ. It has directionality to become.

  As shown in FIGS. 1 and 2, the optical cover 6 includes an annular outer peripheral portion 7 a that covers a plurality of light sources 4 arranged in a circle, and a dome-shaped central portion 7 b that covers the central light source 4. Have. The cross-sectional shape of the outer peripheral part 7a and the center part 7b is formed in a dome shape, forming a meniscus concave lens. Thereby, as shown in FIG. 2, the optical cover 6 emits the light emitted from the light source 4 in the back direction from the side surface. Accordingly, the light source unit 16 is configured to emit a large amount of light rays emitted from the light source 4 from the side surface direction outside the outer peripheral portion 7 a to the back direction by the optical cover 6.

  In the present embodiment, the gap Gi between the peripheral edge 2b of the substrate 2 and the light source 4 is about 10 mm, and the protruding height Hi of the optical cover 6 from the light exit surface of the light source 4 is about 8 mm.

  On the other hand, as shown in FIG. 1, the translucent cover 18 is formed in a substantially flat cylindrical shape using a milky white resin such as polycarbonate or acrylic. The translucent cover 18 is attached to the bottom plate 12 so as to cover the light source unit 16 so as to cover the light source unit 16. The translucent cover 18 has a flat front wall 18 a that faces the light source unit 16 with a gap, a cylindrical side wall 18 b that covers the periphery of the light source unit 16 and has a maximum diameter portion 20, and the rear side of the light source unit 16. An annular back wall 18c to be covered and a circular fixing portion 18d extending coaxially from the back wall 18c are integrally provided. The translucent cover 18 is attached to the bottom plate 12 and covers the light source unit 16 by screwing the screw portion 22 formed on the outer peripheral surface of the fixing portion 18 d into the screw portion 12 b of the bottom plate 12.

  The light source 4 is disposed at a position that protrudes toward the front wall 18a side from the rear side end of the translucent cover 18, and a part of the light emitted from the light source 4 through the optical cover 6 is directed from the light source 4 to the back side. Released.

The distance between the maximum diameter portion 20 of the translucent cover 18 and the peripheral portion 2b of the light source unit 16 is Go (for example, 40 mm), the height from the rear side end of the translucent cover to the light source 4 is Ho (for example, 20 mm), When the gap between the light source 4 and the peripheral edge 2b of the light source unit 16 is Gi and the height at which the optical cover 6 protrudes forward from the light source 4 is Hi,
Ho / Go ≦ Hi / Gi
The light source unit 16 and the translucent cover 18 are formed so as to satisfy the relationship.

When the distance in the height direction between the front side end and the back side end of the translucent cover 18 is H,
H / 4 <(Ho + Hi) <3H / 4
The light source unit 16 and the translucent cover 18 are formed so as to satisfy the relationship.

Furthermore, when the diameter of the maximum diameter portion 20 of the translucent cover 18 is D, the translucent cover 18 is
H ≧ D / 5
It is formed to satisfy the relationship.

  According to the illuminating device 10 configured as described above, at least a part of the light emitted from the light source 4 is not shielded by the optical cover 6 at the peripheral edge 2b, and the back side of the side wall 18b of the translucent cover 18. Can be illuminated brightly. Further, by increasing the area seen from the side with respect to the area seen from the front of the translucent cover 18, the wall surface 21 to which the illumination device 10 is attached can be illuminated brightly through the translucent cover 18. Further, by adjusting the heights of the optical cover 6 and the translucent cover 18, the brightness of the front side and the side surface of the translucent cover 18 can be controlled. Thereby, even when using the light source unit which consists of LED, the illuminating device which can irradiate a side surface or a wall surface brightly is obtained. In addition to uniformizing the illuminance on the side surface of the translucent cover 18, at least one light source 4 is installed near the center of the light source unit 16 on the front side, and the light incident on the central portion 7 b of the optical cover 6 is transmitted. By diffusing and distributing light, it is possible to alleviate luminance unevenness of the translucent cover 18 and realize uniform brightness.

  Next, a lighting device according to a modification will be described. In the modified example described below, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 3 shows the light source unit 16 of the illumination device according to the first modification.
According to the first modified example, the concave and convex grooves are formed on at least the outer surface of the outer peripheral portion 7 a of the optical cover 6, particularly on the outer peripheral surface of the optical cover 6 located on the side opposite to the center of the light source unit 16. . That is, in the first modification, a large number of grooves 30 extending in the radial direction of the substrate 5 are formed over the entire circumference on at least the outer surface of the outer peripheral portion 7a.

  Since the light source 4 is a point light source, it is easy to get a grain feeling. However, as in the first modified example, the outer peripheral portion 7a of the optical cover 6 is processed to have a concave and convex groove to disperse the point image and to give the grain feeling. Can be relaxed. In addition, you may make it acquire the effect | action similar to the above by the structure which forms a wrinkle on the surface of an optical cover, or the structure which mixes a trace amount of scattering fillers in the material of an optical cover. In addition to making the illuminance uniform on the side surface of the optical cover 6, the light source 4 is installed near the center of the light source unit 16 on the front side, and diffused and distributed by the optical cover 6. Relax and achieve uniform brightness.

  FIG. 4 is an enlarged cross-sectional view of the optical cover 6 of the lighting apparatus according to the first modification shown in FIG. The diffusing action of the optical cover 6 is obtained by forming a Fresnel lens 32 having a diffusing action on the inner surface of the dome-shaped optical cover 6 that covers the light source 4.

  Of course, Hi / Gi is set to be larger than Ho / Go so that the back end and the wall surface of the optical cover 6 can be illuminated brightly.

  FIG. 5 is a cross-sectional view showing the light source unit 16 of the illumination device according to the second modification. According to the second modification, the optical cover 6 of the light source unit 16 is formed of a light guide. In the light source unit 16, the substrate 5 is mounted on the front surface of the disk-shaped base material 2, and a plurality of light sources 4 are mounted side by side in a circle coaxial with the base material 2.

  The optical cover 6 includes a central portion formed in a flat plate shape, an annular light receiving portion (incident portion) 6a that is formed on the outer peripheral side of the central portion and faces the light source 4, and a radial direction from the light receiving portion 6a. Curved outward and extended forward, an annular light guide 6b that guides the light incident on the incident part to the side and back, and the light guided by the light guide is emitted to the side and back. And an emission part 6c. Furthermore, the optical cover 6 has a cylindrical fixing portion 6d extending from the middle portion of the light guide portion 6b to the base material 2 side, and is fixed to the front surface of the base material 2 via the fixing portion 6d. . A part of the light emitted from the light sources 4 arranged in a circle is incident and guided by the optical cover 6 made of a light guide, and is irradiated in the side or back direction.

  FIG. 6 is a cross-sectional view showing the light source unit 16 of the illumination device according to the third modification. According to the third modification, the optical cover 6 of the light source unit 16 is formed of a light guide. In the light source unit 16, the substrate 5 is mounted on the front surface of the disk-shaped base material 2, and a plurality of light sources 4 are mounted side by side in a circle coaxial with the base material 2. Further, the light source 4 is also provided at the center of the substrate 5 in order to further improve the darkness of the inside of the light source 4 arranged in a circle.

  The optical cover 6 made of a light guide is curved in a radially outward and forward direction from the light receiving portion 6a and an annular light receiving portion (incident portion) 6a facing the plurality of light sources 4 provided on the outer peripheral portion. An annular light guide 6b that extends the light incident on the incident portion to the side surface and the back side, and an emission portion 6c that emits the light guided by the light guide portion to the side and the back side. Have. The optical cover 6 further includes a light receiving portion (incident portion) 6a that faces the light source 4 at the center, a light guide portion 6b that guides light incident from the light intake portion 6a to the side surface and the front surface side, and a light guide portion. And a light emitting portion 6c that emits the light guided to the side and the front side.

  A part of light emitted from the light sources 4 arranged in a circle shape is incident and guided by the optical cover 6 made of a light guide, and is irradiated in the side surface direction or the back surface direction. By emitting light to the front side and the side surface, it is possible to prevent the occurrence of donut-shaped luminance unevenness.

  FIG. 7 is a cross-sectional view showing the light source unit 16 of the illumination device according to the fourth modification. According to the fourth modification, the optical cover 6 of the light source unit 16 is formed of a light guide. The basic configuration of the light source unit 16 is the same as that of the light source unit 16 according to the third modification, and the configuration of the translucent cover 6 is partially different. According to the fifth modification, the translucent cover 6 also has the light guide / emission part 6f in a region facing the central portion of the substrate 5, that is, a region inside the light source 4 arranged in a circle. . The light guide / emission part 6f has a convex-concave shape so that light is emitted widely in a planar shape in the central region of the optical cover 6.

  In this way, the doughnut-shaped luminance unevenness can be prevented by using the optical cover 6 that guides and emits light to the center.

Also in the above-described second to fourth modified examples, even in an illumination device using the light source 4 with strong directivity, the optical cover 6 is disposed at a position protruding forward from the light source 4 and the peripheral portion 2b of the light source unit 16 is used. By emitting light emitted from the light sources 4 arranged in the vicinity of a circle in the side or back direction with the optical cover 6, it is possible to realize an illuminating device that can irradiate the back end and the wall surface of the translucent cover 18 brightly. .
In the first embodiment and the modified example, the light source unit 16 from which the GX53 type base is removable is shown, but other base standards may be used, and the light source unit may be fixed to the lighting device. Good.

  Next, a lighting device according to another embodiment will be described. In other embodiments to be described later, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

(Second Embodiment)
FIG. 8 is a cross-sectional view of the illumination device 10 according to the second embodiment. The basic configuration of the illumination device 10 is the same as that of the first embodiment, and the shape of the translucent cover 18 and the shape of the light source unit 16 are partially different from those of the first embodiment.

  That is, the translucent cover 18 is formed in a substantially turtle shell shape, is formed in a spherical shape in which the front wall 18a and the side wall are continuous, and the back wall 18c is reversed from the maximum diameter portion (for example, diameter 300 mm) 20 of the front wall 18a. It inclines and extends to the wall surface 21 side. Thereby, it is set as the structure which can irradiate strongly the wall surface 21 vicinity to which the illuminating device 10 was attached.

  The light source unit 16 has a peripheral portion 2b having a diameter of 200 mm, and a plurality of light sources 4 are arranged in a circle having a diameter of 180 mm. The optical cover 6 is formed of a light guide, and the light guide has an annular light receiving portion (incident portion) 6 a facing the plurality of light sources 4 provided on the outer peripheral portion of the base 2, and a light receiving portion. An annular light guide 6b that curves and extends forward and radially outward from 6a, guides the light incident on the incident portion to the side surface and the back surface, and an annular guide that guides the light incident on the incident portion to the center side It has the light guide part 6b and the output part 6c which radiate | emits the light guide | induced by the light guide part to the side and the back side.

The light emitted from the light source 4 is partly diffused and emitted from the side surface to the back surface of the optical cover 6 and partly diffused to the center of the optical cover 6 by the optical cover 6. The height from the rear side end of the translucent cover 18 to the light source 4 is, for example, Ho, 20 mm, the protruding height Hi of the optical cover 6 from the exit surface of the light source 4 is, for example, 14 mm, and the maximum diameter of the translucent cover 18 The interval Go between the portion 20 and the peripheral portion 2b of the light source unit 16 is, for example, 50 mm, and the interval Gi between the light source 4 and the peripheral portion 2b of the light source unit is, for example, 10 mm.
Ho / Go (= 0.4) ≦ Hi / Gi (= 1.4)
The positional relationship satisfies the above relationship.

  According to the illuminating device 10 configured as described above, the wall surface 21 that is the background of the illuminating device can be strongly irradiated to give a very bright atmosphere. Thereby, even when using the light source unit which has the light source which consists of LED, the illuminating device which can irradiate a side surface or a wall surface brightly can be provided. When the optical cover 6 performs a diffusing action, striped luminance unevenness may occur on the optical cover 6. As countermeasures, the surface of the optical cover 6 may be textured, or a small amount of scattering filler may be mixed in the optical cover material. Similarly, in order to alleviate the grain feeling of the light source 4, the optical cover may be grooved perpendicular to the circumferential direction of the circle-shaped arrangement. These processes may be performed on the entire surface of the optical cover or limited to a partial region.

The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements 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.
As for the light extraction structure from the translucent cover, an extraction structure may be provided by bonding a texture or a diffusing member, or the material itself constituting the translucent cover may be mixed with some scattering filler and scattered to be extracted. Good. The number and type of the light sources are not particularly specified, and the action of the present invention can be applied to any light source having strong directivity ahead.

  In the above-described embodiment, the optical cover 6 is formed symmetrically about the light source 4 as a central axis. However, it is preferable that the optical cover 6 has a lens function that matches the shape of the translucent cover 18, and may be asymmetrical. . Further, the central axis of the light source 4 and the central axis of the optical cover 6 do not need to coincide with each other, and the shape and arrangement of the optical cover are not limited.

2 ... base material, 3 ... base, 4 ... light source, 5 ... substrate, 6 ... optical cover, 6a ... light intake part,
6b, 6f ... light guide part, 6c ... emission part, 10 ... illuminating device, 12 ... bottom plate,
16 ... Light source unit, 18 ... Translucent cover, 18a ... Front wall, 18b ... Side wall,
18c ... back wall, 20 ... maximum diameter part,

Claims (8)

A light source unit comprising: a base material having a front surface; a plurality of light sources that are mounted at least in the vicinity of a peripheral edge of the front surface of the base material and emit light strongly in a normal direction; and an optical cover that covers the light source;
A translucent cover that covers the light source unit so as to surround the light source unit, and includes a front wall that faces the light source with a gap, and a side wall that covers the periphery of the light source unit and has a maximum diameter portion; With
The light source is disposed at a position protruding toward the front wall side from the rear side end of the translucent cover, and a part of the light emitted from the light source through the optical cover is on the back side from the light source. Released,
The distance between the maximum diameter portion of the translucent cover and the peripheral portion of the light source unit is Go, the height from the rear side end of the translucent cover to the light source is Ho, and the peripheral portions of the light source and the light source unit are Ho / Go ≦ Hi / Gi, where Gi is the distance between the optical cover and Hi is the height at which the optical cover protrudes forward from the light source.
An illumination device characterized by satisfying the relationship: When the height of the maximum diameter portion of the translucent cover is H,
H / 4 <(Ho + Hi) <3H / 4
The lighting device according to claim 1, wherein the relationship is satisfied. When the diameter of the maximum diameter portion of the translucent cover is D,
H ≧ D / 5
The lighting device according to claim 1, wherein the relationship is satisfied.   The optical cover of the light source unit includes a light guide, and the light guide includes an incident portion that faces the light source, a light guide that guides light incident on the incident portion to a side surface and a rear surface, and the guide. 4. The illumination device according to claim 1, further comprising: an emission unit that emits the light guided by the light unit to a side and a back side. 5.   The illumination device according to any one of claims 1 to 3, wherein at least a part of the surface of the optical cover is provided with a concave / convex groove process.   The illumination device according to claim 5, wherein the uneven groove processing is performed on an outer peripheral surface of the optical cover located on a side opposite to a center of the light source unit.   4. The illumination device according to claim 1, wherein a texture is formed on at least a part of the surface of the optical cover.   The lighting device according to claim 1, wherein the lighting device is a bracket light attached to a wall surface.

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