JP2016219208A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture in which a light guide plate easily emits light uniformly.SOLUTION: A lighting fixture 10 includes: a long light-emitting device 70a and a long light-emitting device 70b arranged side by side in a circumferential direction d0; and a light guide plate 20a arranged between the light-emitting device 70a and the light-emitting device 70b in the circumferential direction d0. The light-emitting device 70a is arranged so that the longitudinal direction is along a radial direction d1, and emits light to an end surface 25a of the light guide plate 20a. The light-emitting device 70b is arranged so that the longitudinal direction is along a radial direction d2, and emits light to an end surface 26a of the light guide plate.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a lighting fixture using a light guide plate.

  In recent years, LED lighting fixtures using LED light sources are becoming widespread. For example, Patent Literature 1 discloses an LED lighting apparatus using a light guide plate. In such an LED lighting apparatus, light from the light source is incident on the end surface of the light guide plate and is emitted from the main surface (light emission surface) of the light guide plate.

JP 2007-80539 A

  In the lighting fixture using the above light guide plate, it is a subject to make a light guide plate emit light uniformly.

  Therefore, the present invention provides a lighting fixture in which the light guide plate is easy to emit light uniformly.

  A lighting fixture according to one embodiment of the present invention includes a long first light emitting device and a long second light emitting device arranged side by side in the circumferential direction, and the first light emitting device in the circumferential direction. A first light guide plate disposed between the light emitting device and the second light emitting device, wherein the first light emitting device is disposed such that a longitudinal direction thereof is along the first radial direction, and The second light emitting device is arranged so that the longitudinal direction thereof is along the second radial direction, and the light is emitted to the end surface of the first light guide plate. Is emitted.

  According to the present invention, a lighting fixture in which the light guide plate easily emits light uniformly is realized.

FIG. 1 is a perspective view of the lighting apparatus according to Embodiment 1 as viewed from below. FIG. 2 is a perspective view of the luminaire according to Embodiment 1 as seen from above. 3 is a partially exploded perspective view of the lighting apparatus according to Embodiment 1. FIG. FIG. 4 is a partial cross-sectional view showing a connection relationship between the light guide plate and the light emitting device. FIG. 5 is a first exploded perspective view of the light emitting device according to Embodiment 1. FIG. 6 is a second exploded perspective view of the light-emitting device according to Embodiment 1. FIG. FIG. 7 is a top view for explaining the arrangement of the light guide plate and the light emitting device according to the first embodiment. FIG. 8 is a top view for explaining the arrangement of the light guide plate and the light emitting device in the lighting fixture according to the first modification. FIG. 9 is a top view for explaining the arrangement of the light guide plate and the light emitting device in the lighting fixture according to the second modification. FIG. 10 is a perspective view of a lighting fixture having a different light guide plate shape as viewed from below.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

  It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, components, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. In each figure, substantially the same configuration is denoted by the same reference numeral, and redundant description may be omitted or simplified.

  In the following embodiments, a lighting fixture realized as a ceiling light will be described. In the drawings of the following embodiments, the Z-axis direction is, for example, the vertical direction, and the Z-axis + side may be described as the upper side or the ceiling side. Further, the Z-axis-side may be described as a lower side or a light emission side. The X-axis direction and the Y-axis direction are directions orthogonal to each other on a plane (horizontal plane) perpendicular to the Z-axis.

  In the drawings, for a structure or member having a plurality of structures having the same function, such as a screw hole, only one structure or member may be provided with a reference numeral.

(Embodiment 1)
[overall structure]
First, the structure of the lighting fixture which concerns on Embodiment 1 is demonstrated in detail. FIG. 1 is a perspective view of the lighting apparatus according to Embodiment 1 as viewed from below. FIG. 2 is a perspective view of the luminaire according to Embodiment 1 as seen from above. 3 is a partially exploded perspective view of the lighting apparatus according to Embodiment 1. FIG.

  As shown in FIGS. 1 to 3, the lighting fixture 10 includes a light guide plate 20 a to 20 c, a fixture main body 50 including a first fixture main body 40 and a second fixture main body 30, a lighting fixture adapter 60, and a light emitting device. 70a-70b. Moreover, the lighting fixture 10 is provided with the connection member 35 and connection members 80a-80c. In addition, in FIG. 1, the central axis J of the lighting fixture 10 is also illustrated.

  The luminaire 10 is a ceiling light that is attached to the ceiling and mainly illuminates the lower part. Hereinafter, each component of the lighting fixture 10 is demonstrated in detail.

[Adapter for lighting equipment]
The luminaire adapter 60 is an adapter for attaching the luminaire 10 to a hooking sealing body (not shown) provided on the ceiling. The shape of the luminaire adapter 60 is a flat and substantially cylindrical shape, and the luminaire adapter 60 is mainly formed of a resin material having insulation properties such as PBT (polybutylene terephthalate).

  In attaching the lighting fixture 10, the user first attaches the lighting fixture adapter 60 to the hooking sealing body, and then inserts the lighting fixture adapter 60 into the mounting hole 41 of the fixture main body 50 (first fixture main body 40). Then, the instrument body 50 is pushed up. Thereby, the edge part of the attachment hole 41 is latched by the latching | locking part 61 of the adapter 60 for lighting fixtures. Thereby, the lighting fixture 10 is attached to a ceiling.

[First instrument body]
The first instrument main body 40 is an annular (doughnut-shaped) member in plan view, and is positioned above the second instrument main body 30. A power supply circuit (not shown) that converts AC power supplied from a commercial system into DC power for causing the light emitting devices 70a to 70c to emit light is housed inside the first instrument body 40. The plan view shape is a shape viewed from a direction perpendicular to the Z axis in the figure, and the same applies to the following embodiments.

  AC power is supplied to the power supply circuit from a commercial system via the hook ceiling body and the lighting fixture adapter 60. The lighting fixture adapter 60 and the power supply circuit are electrically connected by a cable (not shown) with a connector. Connected.

  An opening provided in the center of the first instrument body 40 is an attachment hole 41. The attachment hole 41 is a circular opening for locking the first fixture main body 40 to the lighting fixture adapter 60 as described above.

  The first instrument body 40 as described above is formed of, for example, aluminum, but may be formed of iron or aluminum die cast. Moreover, the 1st instrument main body 40 may be formed with resin materials, such as PBT.

[Second instrument body]
The 2nd instrument main body 30 is a member whose planar view shape is a Y shape, Comprising: Light-emitting device 70a-70c is attached and accommodated. The second instrument body 30 is located below the first instrument body 40. Specifically, the second instrument main body 30 includes an upper cover 31 and a lower cover 32.

  The upper cover 31 is a member having a Y-shape in plan view, and an opening is formed in the central portion.

  The upper cover 31 is provided with three screw insertion holes 31a. For example, a screw inserted from below into a screw insertion hole 73a provided in the light emitting device 70a is passed through the illustrated screw insertion hole 31a. The upper cover 31 and the light emitting device 70 a are fixed to the first instrument body 40 by screwing these screws into screw holes (not shown) provided on the lower side of the first instrument body 40.

  The upper cover 31 is formed of, for example, a resin material such as PBT, but may be formed of a metal material such as aluminum, iron, or aluminum die cast.

  Similarly to the upper cover, the lower cover 32 is a member having a Y-shape in plan view, and a cylindrical portion 33 that forms a circular opening is provided in the center portion. The opening provided in the upper cover 31, the opening formed by the cylindrical portion 33, and the mounting hole 41 described above communicate with each other.

  With such a configuration, the user can visually recognize the lower surface of the luminaire adapter 60 from below after attaching the luminaire main body 50 to the luminaire adapter 60. The user can perform an operation of connecting the above-described cable with the connector to the lower surface of the lighting fixture adapter 60. The lower side of the cylindrical portion 33 is closed by a circular cap 34 (shown in FIG. 1) after the cable connection operation as described above is completed.

  On the outside of the cylindrical portion 33, screw insertion holes 32a for fixing the lower cover 32 to the first instrument body 40 are provided at three locations. For example, a screw is inserted into the illustrated screw insertion hole 32 a from below, and the inserted screw passes through the screw insertion hole 38 of the connection member 35 and is a screw hole ( (Not shown). Thereby, the lower cover 32 and the connection member 35 are fixed to the first instrument body 40.

  The lower cover 32 and the cap 34 are formed of a resin material such as PBT, for example, but may be formed of a metal material such as aluminum, iron, or aluminum die cast.

[Connecting member]
The connection member 35 is a member for connecting the light guide plates 20a to 20c, the second instrument main body 30, the first instrument main body 40, and the light emitting devices 70a to 70c. A circular opening is provided at the center of the connection member 35, and the cylindrical portion 33 of the lower cover 32 is inserted into the opening.

  The connection member 35 is provided with a screw hole 36 for fixing the light guide plates 20 a to 20 c to the connection member 35. A total of six screw holes 36 are provided for one light guide plate. For example, the two screw holes 36 shown in the figure are screwed with screws respectively inserted into the two screw insertion holes 21a of the light guide plate 20a from below. As a result, the light guide plate 20 a is fixed to the connection member 35. The same applies to the light guide plates 20b and 20c.

  Further, the connection member 35 is provided with three screw holes 37 for fixing the light emitting devices 70 a to 70 c to the connection member 35. For example, in the illustrated screw hole 37, a screw inserted from below into the screw insertion hole 73b of the light emitting device 70a is screwed. As a result, the light emitting device 70 a is fixed to the connection member 35. The same applies to the light emitting devices 70b and 70c.

  The connection member 35 is provided with three screw insertion holes 38 for fixing the connection member 35 to the first instrument body 40. For example, the screw inserted through the screw insertion hole 32 a of the lower cover 32 is passed through the illustrated screw insertion hole 38. The connecting member 35 is fixed to the first instrument body 40 by screwing the screw into a screw hole (not shown) provided on the lower side of the first instrument body 40.

  The connection members 80a to 80c are members for connecting the light guide plates 20a to 20c and the light emitting devices 70a to 70c. Since the connection members 80a to 80c have the same configuration, the configuration of the connection member 80a will be described below.

  The connecting member 80a is attached to the light emitting device 70a so as to straddle from above. The connection member 80a is provided with a screw hole 82a, a screw hole 83a, and a screw hole 84a.

  A screw inserted from below into the screw insertion hole 22a of the light guide plate 20a is screwed into the screw hole 82a.

  The screw hole 83a is screwed with a screw inserted from below into the screw insertion hole 22b of the light guide plate 20b. A screw inserted from below into the screw insertion hole 73c of the light emitting device 70a is screwed into the screw hole 84a.

  The connection member 35 and the connection members 80a to 80c are formed, for example, by bending a sheet metal made of aluminum, iron, aluminum die cast, or the like. Note that the connection member 35 and the connection members 80a to 80c may be formed of resin.

[Light guide plate]
The light guide plates 20a to 20c are plate-like optical members having a substantially hexagonal shape (deformed hexagonal shape) in plan view. The light guide plates 20a to 20c are arranged side by side in the circumferential direction around the central axis J in plan view. The light guide plates 20a to 20c are transparent members, but may be members having translucency. The light guide plates 20a to 20c are made of acrylic, for example, but may be polycarbonate, glass, or the like. Since the light guide plates 20a to 20c have the same configuration, the configuration of the light guide plate 20a will be described below.

  Of the end faces of the light guide plate 20a, the end face 25a facing the light emitting device 70a and the end face 26a facing the light emitting device 70b function as a light incident surface to the light guide plate 20a. The end including the end face 25a of the light guide plate 20a is attached to the light emitting device 70a. FIG. 4 is a partial cross-sectional view showing a connection relationship between the light guide plate 20a and the light emitting device 70a.

  As FIG. 4 shows, the edge part containing the end surface 25a of the light-guide plate 20a is inserted in the provided groove part 78. As shown in FIG. A plurality of light transmitting holes (light transmitting holes 79 described later) are provided in a surface of the groove portion 78 that faces the end surface 25a, and light emitted from the light emitting element 72 of the light emitting device 70a enters the end surface 25a. The same applies to the end face 26a. The detailed configuration of the light emitting device (light emitting device 70a) will be described later.

  Here, on the upper surface (Z-axis + side surface) of the light guide plate 20a, a number of grooves, dot patterns, or reflective structures such as prism shapes (fine concave portions and convex portions) are formed. These reflecting structures mainly reflect the light from the light emitting device 70a incident on the end surface 25a and the light from the light emitting device 70b incident on the end surface 26a downward. Thereby, the light guide plate 20a emits surface light (pseudo light emission).

  Note that the lower surface (the surface on the Z-axis side) of the light guide plate 20a may be subjected to a diffusion process for uniformly extracting the light reflected by the reflection structure. Examples of the diffusion processing include silk printing or embossing.

  The light guide plate 20 a is provided with a screw insertion hole 21 a for fixing the light guide plate 20 a to the instrument body 50 via the connection member 35. The light guide plate 20a has a screw insertion hole 22a for fixing the light guide plate 20a to the light emitting device 70a via the connection member 80a, and a light guide plate 20a for fixing the light guide plate 20a to the light emitting device 70b via the connection member 80b. The screw insertion hole 23a is also provided.

[Light emitting device]
Next, the configuration of the light emitting devices 70a to 70c will be described. The light emitting devices 70 a to 70 c are light sources of the lighting fixture 10. The light emitting devices 70a to 70c are arranged side by side in the circumferential direction around the central axis J in plan view. In plan view, the longitudinal direction of the light emitting devices 70a to 70c is a direction along the radial direction with the central axis J as the center.

  The light emitting device 70a is positioned between the light guide plates 20a and 20b in the circumferential direction, and emits light to each of the light guide plates 20a and 20b. Similarly, the light emitting device 70b is located between the light guide plates 20a and 20c in the circumferential direction, and emits light to each of the light guide plates 20a and 20c. The light emitting device 70c is located between the light guide plates 20b and 20c in the circumferential direction, and emits light to each of the light guide plates 20b and 20c. The light emitting devices 70a to 70b are electrically connected to a power supply circuit in the first instrument body 40 by a cable (not shown), and emit light using power supplied from the power supply circuit.

  Since the light emitting devices 70a to 70c have the same configuration, the detailed configuration of the light emitting device 70a will be described below with reference to FIGS. 5 and 6 are exploded perspective views of the light emitting device 70a. 5 and 6, the light guide plate 20a is also illustrated.

  The light emitting device 70a includes a substrate 71 (light emitting module) on which a plurality of light emitting elements 72 are provided, and a holder 90 (an attachment member 73 and a front member 74).

  Specifically, the substrate 71 is a long rectangular film substrate that is long in the radial direction about the central axis J. The longitudinal direction of the substrate 71 is the radial direction, and the short direction of the substrate 71 is the thickness direction (Z-axis direction) of the light guide plate 20a. The board | substrate 71 is arrange | positioned substantially parallel to the end surface 25a of the light-guide plate 20a.

  Specifically, the substrate 71 is a substrate in which the insulating layer is formed of FR4 (glass fiber), a substrate in which the insulating layer is formed of polyimide, or a substrate in which the insulating layer is formed of polyethylene. The substrate 71 may be a rigid substrate such as a resin substrate, a ceramic substrate, or a metal base substrate.

  A surface of the substrate 71 that faces the front member 74 is a first main surface 71a. A plurality of light emitting elements 72 are mounted on the first main surface 71a. The plurality of light emitting elements 72 are arranged in a line in the longitudinal direction. Further, the surface of the substrate 71 that faces the attachment member 73 is a second main surface 71b. The second main surface 71b is bonded to the attachment member 73 by an adhesive member such as an adhesive tape (double-sided tape). An insulating member or a heat radiating member may further be interposed between the second main surface 71b and the attachment member 73.

  The substrate 71 has openings 75a and 75b. The opening 75a is provided at a position corresponding to the protrusion 76a provided on the front member 74, and has a slightly larger hole diameter than the protrusion 76a. The opening 75b is provided at a position corresponding to the protrusion 76b provided on the front member 74, and has a slightly larger hole diameter than the protrusion 76b. Such openings 75 a and 75 b are used for positioning (temporary fixing) with respect to the front member 74.

  The light emitting elements 72 are surface mount type (SMD type) LED elements that emit white light, and a plurality of the light emitting elements 72 are provided on the first main surface 71 a of the substrate 71. The surface-mount LED element is a package-type LED element in which an LED chip is mounted in a resin-molded cavity and a phosphor-containing resin is enclosed in the cavity. Each of the plurality of light emitting elements 72 emits light of, for example, daylight color to light bulb color (color temperature of 2600K to 7100K) mainly toward the front member 74.

[holder]
Next, the configuration of the holder 90 will be described with reference to FIGS. 5 and 6.

  The holder 90 is a member that holds the substrate 71, and is disposed to face the end surface 25a in order to make the light emitted from the light emitting element 72 enter the end surface 25a of the light guide plate 20a. The holder 90 includes an attachment member 73 and a front member 74 positioned between the attachment member 73 and the end surface 25 a, and holds the substrate 71 between the attachment member 73 and the front member 74.

  The attachment member 73 is a member used for attaching the holder 90 to the instrument body 50. The attachment member 73 is formed by bending a plate-like member into a (bracket shape). The attachment member 73 is formed by bending a sheet metal made of, for example, aluminum, iron, or aluminum die cast. The attachment member 73 also functions as a heat dissipation member for the substrate 71.

  Specifically, the attachment member 73 includes plate-like portions 73d and 73e arranged to face each other and a plate-like portion 73f that connects the plate-like portions 73d and 73e on the upper side.

  The plate-like portion 73f is a long plate-like (rectangular) member that is long in the radial direction about the central axis J, and is disposed substantially parallel to the upper surface of the light guide plate 20a. The plate-like portion 73f is provided with the aforementioned screw insertion holes 73a, 73b, and 73c.

  The plate-like portion 73d is a long plate-like (rectangular) member that is long in the radial direction around the central axis J, and is arranged substantially in parallel with the end face 25a of the light guide plate 20a. The plate-like portion 73d is located closer to the substrate 71 than the plate-like portion 73e. The 2nd main surface 71b of the board | substrate 71 is attached to the surface facing the board | substrate 71 of the plate-shaped part 73d with an adhesive member.

  The plate-like portion 73d is provided with screw holes (for example, screw holes 81c) at five locations including the four corners. These screw holes are used for fixing the attachment member 73 and the front member 74. The plate-like portion 73d is provided with an insertion hole 81a at a position corresponding to the opening 75a, and an insertion hole 81b at a position corresponding to the opening 75b. The insertion holes 81a and 81b are openings through which the protrusions 76a and 76b provided on the front member are passed in order to bring the substrate 71 into close contact with the plate-like portion 73d.

  The plate-like portion 73e is a long plate-like (rectangular) member that is long in the radial direction about the central axis J, and is arranged substantially parallel to the plate-like portion 73d. The second main surface (the light emitting element 72 is not provided) on the surface of the plate-like portion 73e opposite to the substrate 71, which is a substrate different from the substrate 71 and emits light to the end surface of the light guide plate 20b. Surface) is attached. That is, the attachment member 73 is shared by the two substrates. The attachment member 73 may be provided for each substrate (for each light emitting module).

  In addition, one board | substrate (film board | substrate) with which the light emitting element 72 was mounted is bent, and is attached ranging over the surface by the side of the light guide plate 20a of the plate-shaped part 73d, and the surface by the side of the light guide plate 20b of the plate-shaped part 73e. May be. Thereby, light can be radiate | emitted to both the light-guide plates 20a and 20b by said one board | substrate.

  The front member 74 is a member disposed on the front surface of the substrate 71 (the main light emission direction). The front member 74 is a long plate-shaped (rectangular) member that is long in the radial direction about the central axis J. The front member 74 is disposed substantially parallel to the end surface 25a of the light guide plate 20a. The front member 74 has a light transmitting hole 79 through which light emitted from the light emitting element 72 passes, and the light emitted from the light emitting element 72 enters the end surface 25a of the light guide plate 20a through the light transmitting hole 79.

  The translucent hole 79 is not an essential component. For example, when the front member 74 has translucency, the translucent hole 79 does not need to be provided. Further, even when a part of the first main surface 71a of the substrate 71 is covered by the front member 74 and the light emitting element 72 is not covered by the front member 74, the light transmitting holes 79 do not need to be provided. .

  The front member 74 is formed of a resin material such as PBT, for example. In addition, in order to increase the amount of light incident on the light guide plate 20a by reflection, the front member 74 is preferably formed of a white resin or a resin having a high reflectance.

  The attachment member 73 and the front member 74 are fixed by screws with the substrate 71 held therebetween. Specifically, the front member 74 has screws (for example, screws 95) inserted into screw insertion holes (for example, screw insertion holes 78b) provided at five locations including the four corners. For example, it is fixed to the attachment member 73 by being screwed into the screw hole 81c).

  Here, the front member 74 has protrusions 76 a and 76 b that protrude toward the attachment member 73 on the surface facing the substrate 71. Before the front member 74 is fixed to the attachment member 73, the substrate 71 is attached (temporarily fixed) to the front member 74 with the first main surface 71a facing the front member 74 side. At this time, the protrusion 76 a is inserted into the opening 75 a of the substrate 71, and the protrusion 76 b is inserted into the opening 75 b of the substrate 71.

  According to the protrusions 76 a and 76 b, the substrate 71 can be temporarily fixed (positioned) to the front member 74 before the front member 74 is fixed to the attachment member 73. Due to this temporary fixing, the position of the substrate 71 is not easily displaced when the front member 74 is fixed to the attachment member 73. That is, the workability when fixing the front member 74 to the attachment member 73 is improved, and the attachment accuracy of the substrate 71 (light emitting module) is improved.

  In the first embodiment, the substrate 71 is a film substrate, and the insulating layer has a very thin thickness of about 0.1 mm. For this reason, the substrate 71 is more flexible than the rigid substrate, and the workability of the positioning operation is poor. The protrusions 76a and 76b can be easily positioned (temporarily fixed) even when the substrate 71 is a film substrate, and the effect of improving workability is particularly remarkable when the substrate 71 is a film substrate.

  As described with reference to FIG. 4, the front member 74 has a groove portion 78 that forms a groove into which the light guide plate 20 a is inserted on the surface facing the end surface 25 a of the light guide plate 20 a.

  According to such a configuration, the mounting position of the light guide plate 20a with respect to the front member 74 is easily determined. That is, the positional relationship between the substrate 71 and the light guide plate 20a can be easily determined via the front member 74, and a decrease in light emission efficiency due to a positional shift between the substrate 71 and the light guide plate 20a can be suppressed.

  In the lighting fixture 10, the groove 78 holds the light guide plate 20 a so that the light guide plate 20 a is parallel to the horizontal plane (the XY plane in the drawing), but the groove 78 holds the light guide plate 20 a on the horizontal plane. May be held at an angle.

  By the way, in order to improve the heat dissipation of the substrate 71, it is preferable that the second main surface 71 b of the substrate 71 is bonded (contacted) to the attachment member 73. Here, since the attachment member 73 is provided with the insertion holes 81a and 81b through which the protrusions 76a and 76b are released, the substrate 71 can be brought into close contact with the attachment member 73.

  Even if the insertion holes 81 a and 81 b are not provided, for example, if the height of the protrusions 76 a and 76 b is less than the thickness of the substrate 71, the substrate 71 can be brought into close contact with the mounting member 73. However, such processing is difficult. In particular, when the substrate 71 is a film substrate, the thickness of the insulating layer is as thin as about 0.1 mm, and thus the processing requires very high accuracy.

  On the other hand, as described above, if the insertion holes 81a and 81b are provided, the board 71 can be easily attached to the mounting member 73 because the projections 76a and 76b are inserted into the insertion holes 81a and 81b even if the height is high. It can be adhered.

  The front member 74 has two protrusions 76a and 76b, but it is sufficient that the front member 74 has at least one protrusion. However, the front member 74 has a plurality of protrusions 76a and 76b, and the substrate 71 is rotated with respect to the front member 74 by providing insertion holes 81a and 81b corresponding to the plurality of protrusions 76a and 76b. It becomes difficult to do. For this reason, the above-mentioned positioning effect and the effect which improves workability | operativity can further be heightened.

  In particular, in the case of a long shape like the substrate 71, the substrate 71 is provided with a plurality of insertion holes 81a and 81b having different positions in the longitudinal direction, and the front member 74 is provided with protrusions 76a and 76b corresponding to these. A high positioning effect is obtained. Note that three or more protrusions may be provided.

[Arrangement of light guide plate and light emitting device]
Hereinafter, the arrangement of the light guide plates 20a to 20c and the light emitting devices 70a to 70c in the lighting fixture 10 will be described. FIG. 7 is a top view for explaining the arrangement of the light guide plates 20a to 20c and the light emitting devices 70a to 70c. In FIG. 7, components of the lighting fixture 10 other than the light guide plates 20a to 20c and the light emitting devices 70a to 70c are not shown, and only the outline of the light emitting devices 70a to 70c is indicated by broken lines. Yes.

  As shown in FIG. 7, the light emitting devices 70 a to 70 c are long in plan view. In plan view, the light emitting devices 70a to 70c are arranged side by side in the circumferential direction d0.

  The light emitting device 70a is arranged so that the longitudinal direction is along the radial direction d1. Specifically, the first main surface 71a (or the second main surface 71b) of the substrate 71 included in the light emitting device 70a intersects the circumferential direction d0 perpendicularly, and the substrate 71 has a diameter perpendicular to the circumferential direction d0. Arranged along the direction d1.

  Similarly, the light emitting device 70b is disposed so that the longitudinal direction thereof is along the radial direction d2, and the light emitting device 70c is disposed so that the longitudinal direction is along the radial direction d3.

  On the other hand, in plan view, the light guide plates 20a to 20c are arranged side by side in the circumferential direction d0 so that the main surface is visible. And each light guide plate 20a-20c is located between the light-emitting devices in the circumferential direction d0. That is, in the circumferential direction d0, the light emitting device and the light guide plate are alternately arranged.

  For example, the light guide plate 20a is disposed between the light emitting device 70a and the light emitting device 70b. The light from the light emitting device 70a and the light from the light emitting device 70b are incident on the light guide plate 20a. Specifically, the light guide plate 20a is an end surface 25a that is a plane along the radial direction d1 where the light from the light emitting device 70a is incident, and a plane along the radial direction d2 where the light is incident from the light emitting device 70b. And an end face 26a. The end face 25a is an end face of the light guide plate 20a facing the light emitting device 70a, and the end face 26a is an end face of the light guide plate 20a facing the light emitting device 70b.

  Similarly, the light guide plate 20b is disposed between the light emitting device 70a and the light emitting device 70c. The light from the light emitting device 70a and the light from the light emitting device 70c are incident on the light guide plate 20b. Specifically, the light guide plate 20b is an end surface 25b that is a plane along the radial direction d1 where the light from the light emitting device 70a enters, and a plane along the radial direction d3 where the light enters from the light emitting device 70c. And an end face 26b. The end face 25b is an end face of the light guide plate 20b that faces the light emitting device 70a, and the end face 26b is an end face of the light guide plate 20b that faces the light emitting device 70c.

  In addition, a light guide plate 20c is disposed between the light emitting device 70b and the light emitting device 70c. The light from the light emitting device 70b and the light from the light emitting device 70c are incident on the light guide plate 20c. Specifically, the light guide plate 20c is an end surface 26c that is a plane along the radial direction d2 where light from the light emitting device 70b is incident, and a plane along the radial direction d3 where light is incident from the light emitting device 70c. And an end face 25c. The end face 26c is an end face of the light guide plate 20c facing the light emitting device 70b, and the end face 25c is an end face of the light guide plate 20a facing the light emitting device 70c.

  Note that the end surface 25a and the end surface 25b are parallel surfaces, and the end surface 25a and the end surface 25b face each other when the light emitting device 70a is not provided. Similarly, the end surface 26a and the end surface 26c are parallel surfaces, and when the light emitting device 70b is not provided, the end surface 26a and the end surface 26c face each other. The end surface 26b and the end surface 25c are parallel surfaces, and when the light emitting device 70c is not provided, the end surface 26b and the end surface 25c face each other. Although not shown in FIG. 7, the end surface 25a, the end surface 26a, the end surface 25b, the end surface 26b, the end surface 25c, and the end surface 26c are located in the instrument main body 50 (second instrument main body 30).

  As described above, one light guide plate is disposed between two light emitting devices, so that light is incident on the one light guide plate from two light emitting devices (in two directions). For this reason, the effect which makes a light-guide plate light-emit uniformly uniformly is acquired rather than the case where one light-guide plate light-emits with one light-emitting device.

  Specifically, for example, when light is incident on the light guide plate 20a only from one light emitting device, part of the light is blocked by the screws inserted into the screw insertion hole 21a and the screw insertion hole 22a described above. In some cases, the light guide plate 20a emits light unevenly.

  On the other hand, in the light guide plate 20a, in the configuration in which light is incident from each of the two light emitting devices, unevenness in light emission caused by the screw insertion holes can be reduced.

  Moreover, since the instrument main body 50 has the attachment hole 41 in the part (center part) containing the position used as the center of the said circumference, it is difficult to arrange | position a light-emitting device in the center part of the instrument main body 50. FIG. Thus, in the lighting fixture in which the attachment hole 41 is provided in the central portion, a configuration like the lighting fixture 10 in which the light emitting device is disposed between the light guide plates in the circumferential direction d0 is particularly useful.

  Moreover, in the lighting fixture 10, one light-guide plate has two end surfaces which function as an incident surface. For example, the light guide plate 20a has an end face 25a on which light from the light emitting device 70a enters and an end face 26b on which light from the light emitting device 70b enters.

  Thus, in the light guide plate 20a, light is incident from each of the two end surfaces 25a and 26a, so that light is incident on the light guide plate 20a from the two end surfaces. For this reason, the effect that it is easy to make the light-guide plate 20a light-emit uniformly than the case where light injects with one light-emitting device from one end surface is acquired. The same applies to the light guide plates 20b and 20c.

  Moreover, in the lighting fixture 10, light is emitted from an end face facing the outside of one light guide plate (an end face not accommodated in the fixture body 50), but this light faces the outside of the other light guide plate. It is configured so as not to interfere with the light emitted from the end face. Specifically, the shape of the light guide plate is designed so that the end face facing the outside of one light guide plate does not face at least the end face facing the outside of another light guide plate. In addition, the planar view shape of the light-guide plates 20a-20c is a substantially hexagon (deformation hexagon).

  For example, the end surface 27a facing the outside of the light guide plate 20a shown in FIG. 7 does not face the end surface 27b facing the outside of the light guide plate 20b. As a result, the light L1 emitted from the end surface 27a of the light guide plate 20a and the light L2 emitted from the end surface 27b of the light guide plate 20b are unlikely to interfere with each other, and thus uneven brightness due to the interference between the light L1 and the light L2. The occurrence of uneven color can be suppressed.

[Modification 1]
In the above-described embodiment, an example in which one light guide plate has two end surfaces that function as incident surfaces has been described, but light may be incident from two light emitting devices on one incident surface. FIG. 8 is a top view for explaining the arrangement of the light guide plate and the light emitting device in the lighting fixture according to the first modification. In FIG. 8, components other than the light guide plate and the light emitting device are not shown, and only the outline of the light emitting device is indicated by a broken line.

  The lighting fixture 210 shown in FIG. 8 has a plurality of light emitting devices 270a to 270c arranged in the circumferential direction d0 and a plurality of light guide plates 220a to 220c arranged in the circumferential direction d0 in plan view. With. Also in the lighting fixture 210, the light emitting device 270a is disposed so that the longitudinal direction thereof is along the radial direction d1, the light emitting device 270b is disposed so that the longitudinal direction is along the radial direction d2, and the light emitting device 270c is disposed in the longitudinal direction. Arranged along the radial direction d3.

  Note that each of the light emitting devices 270a to 270c has the same configuration as the above-described light emitting device 70a, and can emit light to two light guide plates adjacent to the light emitting device in the circumferential direction d0.

  For example, the light guide plate 220a is disposed between the light emitting device 270a and the light emitting device 270b adjacent in the circumferential direction d0.

  Here, the light guide plate 220a has a curved end surface 225a, and light from the light emitting device 270a and light from the light emitting device 270b are incident on the end surface 225a. The end surface 225a is a curved surface protruding toward the central axis J.

  Similarly, the light guide plate 220b disposed between the light emitting device 270a and the light emitting device 270c has a curved end surface 225b, and the end surface 225b includes light from the light emitting device 270a and light from the light emitting device 270c. Is incident. The light guide plate 220c disposed between the light emitting device 270b and the light emitting device 270c has a curved end surface 225c, and light from the light emitting device 270b and light from the light emitting device 270c are incident on the end surface 225c. .

  As described above, the light fixture 210 that receives light from two light emitting devices with respect to one incident surface also causes light to enter one light guide plate from two light emitting devices. The light guide plate can emit light more uniformly than when light enters from one light emitting device.

  In each of the light emitting devices 270a to 270c, it is preferable that the light emitting element 72 is disposed along a curved end surface from which the light emitting device emits light. For example, if the above-described film substrate is used, the light emitting element 72 can be disposed along a curved end surface.

[Modification 2]
The number of light guide plates included in the lighting fixture is not particularly limited. For example, the lighting fixture may include four light guide plates. FIG. 9 is a top view for explaining the arrangement of the light guide plate and the light emitting device in the lighting fixture according to the second modification. In FIG. 9, the components other than the light guide plate and the light emitting device are not shown, and only the outline of the light emitting device is indicated by a broken line.

  9 is a plan view of a plurality of light emitting devices 370a to 370d arranged in the circumferential direction d0 and a plurality of light guide plates 320a to 320d arranged in the circumferential direction d0. With. Also in the lighting fixture 310, the light-emitting device 370a is arrange | positioned so that a longitudinal direction may follow the radial direction d1, and the light-emitting device 370b is arrange | positioned so that a longitudinal direction may follow the radial direction d2. The light emitting device 370c is arranged so that the longitudinal direction is along the radial direction d3, and the light emitting device 370d is arranged so that the longitudinal direction is along the radial direction d4.

  Note that the light emitting devices 370a to 370d have the same configuration as the above-described light emitting device 70a, and can emit light to two light guide plates adjacent to the light emitting device in the circumferential direction d0.

  For example, a light guide plate 320a on which light from the light emitting device 370a and light from the light emitting device 370d are incident is disposed between the light emitting device 370a and the light emitting device 370d adjacent in the circumferential direction d0. Between the light emitting device 370a and the light emitting device 370b adjacent in the circumferential direction d0, the light guide plate 320b on which the light from the light emitting device 370a and the light from the light emitting device 370b enter is arranged.

  Similarly, a light guide plate 320c on which light from the light emitting device 370b and light from the light emitting device 370c are incident is disposed between the light emitting devices 370b and 370c adjacent in the circumferential direction d0. Between the light emitting device 370c and the light emitting device 370d adjacent in the circumferential direction d0, a light guide plate 320d on which the light from the light emitting device 370c and the light from the light emitting device 370d are incident is disposed.

  Thus, also in the lighting fixture 310 provided with the four light-guide plates 320a-320d, since light enters from one light-emitting device to one light-guide plate, light enters from one light-emitting device to one light-guide plate. As a result, it is possible to obtain an effect that the light guide plate can emit light more uniformly than in the case where the light is transmitted.

[Summary]
As described above, the lighting fixture 10 according to the above embodiment includes the long light emitting device 70a and the long light emitting device 70b arranged side by side in the circumferential direction d0, and in the circumferential direction d0. The light guide plate 20a is disposed between the light emitting device 70a and the light emitting device 70b. The light emitting device 70a is disposed such that the longitudinal direction thereof is along the radial direction d1, and emits light to the end face (for example, the end face 25a) of the light guide plate 20a. The light emitting device 70b is disposed such that the longitudinal direction thereof is along the radial direction d2, and emits light to the end face (for example, the end face 26a) of the light guide plate. The light emitting device 70a is an example of a first light emitting device, the light emitting device 70b is an example of a second light emitting device, and the light guide plate 20a is an example of a first light guide plate. The radial direction d1 is an example of a first radial direction, and the radial direction d2 is an example of a second radial direction.

  Thereby, since light enters the light guide plate 20a from the two light emitting devices 70a and 70b, an effect of making the light guide plate 20a emit light more uniformly than when the light guide plate 20a emits light with one light emitting device is obtained.

  In addition, the aspect of the light-emitting device used for the lighting fixture 10 is not limited to an aspect like the light-emitting device 70a. The light emitting device used in the lighting fixture 10 may have any form as long as it has at least a light emitting element and can emit light to the light guide plate.

  The light guide plate 20a has an end surface 25a that is a plane along the radial direction d1 where light from the light emitting device 70a enters and an end surface that is a plane along the radial direction d2 where light from the light emitting device 70b enters. The end surface 25a having 26a is an example of a first end surface, and the end surface 26a is an example of a second end surface.

  Thereby, since light is incident on the light guide plate 20a from the two end faces 25a and 26a, the light guide plate 20a can easily emit light uniformly.

  Moreover, the lighting fixture 10 may be provided with the elongate light-emitting device 70c, the light-guide plate 20b, and the light-guide plate 20c. The light emitting device 70c is an example of a third light emitting device, the light guide plate 20b is an example of a second light guide plate, and the light guide plate 20c is an example of a third light guide plate.

  At this time, the light emitting device 70a, the light emitting device 70b, and the light emitting device 70c are arranged side by side in the circumferential direction d0. The light emitting device 70c is arranged so that the longitudinal direction is along the radial direction d3. The radial direction d3 is an example of a third radial direction.

  The light guide plate 20b is disposed between the light emitting device 70a and the light emitting device 70c in the circumferential direction d0, and the light guide plate 20c is disposed between the light emitting device 70b and the light emitting device 70c in the circumferential direction d0.

  The light emitting device 70a emits light to each of the end face 25a of the light guide plate 20a and the end face 25b of the light guide plate 20b. The light emitting device 70b emits light to each of the end surface 26a of the light guide plate 20a and the end surface 26c of the light guide plate 20c. The light emitting device 70c emits light to each of the end face 26b of the light guide plate 20b and the end face 25c of the light guide plate 20c.

  Accordingly, light is incident on the light guide plate 20b from the two light emitting devices 70a and 70c, and light is incident on the light guide plate 20c from the two light emitting devices 70b and 70c, so that the light guide plates 20b and 20c can easily emit light uniformly. An effect is obtained.

  The light guide plate 20b has an end surface 25b that is a plane along the radial direction d1 where light from the light emitting device 70a is incident, and an end surface that is a plane along the radial direction d3 where light from the light emitting device 70c is incident. 26b. The light guide plate 20c includes an end surface 26c that is a plane along the radial direction d2 where light from the light emitting device 70b is incident, and an end surface 25c that is a plane along the radial direction d3 where light from the light emitting device 70c is incident. Have The end face 25b is an example of a third end face, the end face 26b is an example of a fourth end face, the end face 26c is an example of a fifth end face, and the end face 25c is an example of a sixth end face. is there.

  Accordingly, light is incident on the light guide plate 20b from the two end surfaces 25b and 26b, and light is incident on the light guide plate 20c from the two end surfaces 25c and 26c, so that the light guide plates 20b and 20c can easily emit light uniformly. can get.

  The lighting fixture 10 may further include a fixture main body 50 that houses the light emitting device 70a, the light emitting device 70b, and the light emitting device 70c. At this time, the end surface 25a, the end surface 26a, the end surface 25b, the end surface 26b, the end surface 26c, the end surface 25c, and the instrument body 50 may be positioned.

  Thereby, the lighting fixture 10 can accommodate the light incident surfaces (end surfaces) of the light guide plates 20 a to 20 c in the fixture main body 50.

  The fixture body 50 further has a mounting hole 41 at a portion including the position that becomes the center of the circumference, and the mounting hole 41 is used for attaching the lighting fixture 10 to the hooking ceiling body provided on the ceiling. An instrument adapter 60 may be inserted.

  Thereby, even when it is difficult to dispose the light emitting device in the central portion of the instrument body 50 due to the mounting hole 41, an effect of easily making the light guide plate 20a emit light uniformly can be obtained.

  In addition, the light guide plate 20a may have a screw insertion hole 22a through which a screw for fixing the light guide plate 20a to the light emitting device 70a is inserted. In addition, the light guide plate 20a may have a screw insertion hole 23a through which a screw for fixing the light guide plate 20a to the light emitting device 70b is inserted. The screw is an example of a fixing member, and the screw insertion holes 22a and 23a are examples of insertion holes.

  Thereby, the light emission unevenness of the light guide plate 20a due to the screw insertion hole 22a or the screw insertion hole 23a can be reduced.

(Other embodiments)
As mentioned above, although the lighting fixture which concerns on embodiment was demonstrated, this invention is not limited to such embodiment.

  For example, the shape of the light guide plate described in the above embodiment is an example, and is not particularly limited. FIG. 9 is a perspective view of a lighting fixture having a different shape of the light guide plate as viewed from below.

  The luminaire 10a shown in FIG. 9 includes light guide plates 120a to 120c having a rounded triangular shape as a whole in plan view. The present invention can also be applied to such a lighting fixture 10a.

  In the above-described embodiment, an example in which the present invention is realized as a ceiling light has been described. However, the present invention may be applied to other lighting fixtures other than the ceiling light. For example, this invention may be implement | achieved as a lighting fixture attached to structures other than ceilings, such as a wall. Further, the present invention may be realized as a so-called pendant light.

  Moreover, the screw demonstrated in the said embodiment is an example of a fixing member. Other fixing members such as rivets or push rivets may be used for fixing the members.

  Moreover, in the said embodiment, although the board | substrate 71 is what is called a SMD type light emitting module, the aspect of a light emitting element is not specifically limited. For example, the substrate 71 may be realized as a COB (Chip On Board) type light emitting module. Moreover, the board | substrate 71 may be implement | achieved as a light emitting module comprised using solid light emitting elements other than LED, such as an organic EL element (OLED) or an inorganic EL element.

  As mentioned above, although the lighting fixture which concerns on one or several aspects was demonstrated based on embodiment, this invention is not limited to this embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.

10, 10a, 210, 310 Lighting fixtures 20a, 20b, 20c, 120a, 120b, 120c, 220a, 220b, 220c, 320a, 320b, 320c, 320d Light guide plate 22a, 22b Screw insertion hole (insertion hole)
25a, 25b, 25c, 26a, 26b, 26c, 27a, 27b, 225a, 225b, 225c End face 41 Mounting hole 50 Instrument body 60 Lighting equipment adapter 70a, 70b, 70c, 270a, 270b, 270c, 370a, 370b, 370c 370d light emitting device

Claims (7)

A long first light emitting device and a long second light emitting device, arranged side by side in the circumferential direction;
A first light guide plate disposed between the first light emitting device and the second light emitting device in the circumferential direction;
The first light emitting device is disposed such that a longitudinal direction thereof is along the first radial direction, and emits light to an end surface of the first light guide plate,
The said 2nd light-emitting device is arrange | positioned so that a longitudinal direction may follow a 2nd radial direction, and radiate | emits light to the end surface of a said 1st light-guide plate. The first light guide plate is
A first end face that is a plane along the first radial direction on which light from the first light emitting device is incident;
The lighting apparatus according to claim 1, further comprising: a second end face that is a plane along the second radial direction on which light from the second light emitting device is incident. A long third light emitting device;
A second light guide plate and a third light guide plate;
The first light emitting device, the second light emitting device, and the third light emitting device are arranged side by side in the circumferential direction,
The third light emitting device is disposed such that the longitudinal direction is along the third radial direction,
The second light guide plate is disposed between the first light emitting device and the third light emitting device in the circumferential direction,
The third light guide plate is disposed between the second light emitting device and the third light emitting device in the circumferential direction,
The first light emitting device emits light to each of an end surface of the first light guide plate and an end surface of the second light guide plate,
The second light emitting device emits light to each of an end surface of the first light guide plate and an end surface of the third light guide plate,
The lighting apparatus according to claim 2, wherein the third light emitting device emits light to each of an end surface of the second light guide plate and an end surface of the third light guide plate. The second light guide plate receives light from the first light-emitting device, a third end surface that is a plane along the first radial direction, and light from the third light-emitting device. And a fourth end face that is a plane along the third radial direction,
The third light guide plate receives a light from the second light-emitting device, a fifth end surface that is a plane along the second radial direction, and a light from the third light-emitting device. The lighting fixture according to claim 3, further comprising: a sixth end face that is a plane along the third radial direction. And an instrument body that houses the first light-emitting device, the second light-emitting device, and the third light-emitting device,
The first end face, the second end face, the third end face, the fourth end face, the fifth end face, and the sixth end face are located in the instrument body. The luminaire described. The instrument body further has a mounting hole in a portion including a position that becomes the center of the circumference,
The lighting fixture according to claim 5, wherein an adapter for a lighting fixture for attaching the lighting fixture to a hanging ceiling body provided on a ceiling is inserted into the attachment hole. The first light guide plate has an insertion hole through which a fixing member for fixing the first light guide plate to the first light emitting device or the second light emitting device is inserted. The lighting fixture of Claim 1.

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