JP2022082357A - Lighting system - Google Patents

Abstract

To provide a lighting system having a speaker function.SOLUTION: A lighting system 10 includes: a light source 30a; a light guide plate 40a having an upper side surface 43 on which light emitted by the light source 30a is incident, and a second main surface 42 from which the light incident on the side surface is emitted; a reflection plate 50 having a reflection surface 52 which reflects the light emitted from the second main surface 42, and arranged so that the reflection surface 52 crosses the second main surface 42 of the light guide plate 40a; and a vibrator 60 which generates sound by vibrating the reflection plate 50.SELECTED DRAWING: Figure 5

Description

The present invention relates to a lighting device including a light guide plate.

In recent years, a light source using an LED (Light Emitting Diode) has become widespread. For example, Patent Document 1 discloses a planar light emitting device having high brightness and uniform brightness.

Japanese Unexamined Patent Publication No. 2004-12793

The present invention provides a lighting device having a speaker function.

The lighting device according to one aspect of the present invention is emitted from the main surface, a light guide plate having a light source, a side surface on which the light emitted by the light source is incident, and a main surface on which the light incident on the side surface is emitted. A reflecting plate having a reflecting surface for reflecting light and arranged so that the reflecting surface intersects the main surface of the light guide plate, and a vibrator that generates sound by vibrating the reflecting plate. Be prepared.

According to the present invention, a lighting device having a speaker function is realized.

FIG. 1 is an external perspective view of the lighting system according to the embodiment as viewed from above. FIG. 2 is a diagram showing an example of a power receiving structure. FIG. 3 is an external perspective view of the lighting device according to the embodiment as viewed from above. FIG. 4 is an external perspective view of the lighting device according to the embodiment as viewed from below. FIG. 5 is an exploded perspective view of the lighting device according to the embodiment. FIG. 6 is a schematic cross-sectional view of the lighting device according to the embodiment. FIG. 7 is a diagram showing the reachable range of the direct sound emitted by the lighting device according to the embodiment and the irradiation range of the light of the lighting device. FIG. 8 is a schematic cross-sectional view of a lighting device to which the first example of an optical structure for realizing a predetermined light distribution characteristic is applied. FIG. 9 is a schematic cross-sectional view of a lighting device to which a second example of an optical structure for achieving a predetermined light distribution characteristic is applied. FIG. 10 is a schematic cross-sectional view of a lighting device provided with a reflective member on the lower side surface. FIG. 11 is a schematic cross-sectional view of the lighting device according to the first modification. FIG. 12 is a schematic cross-sectional view of a lighting device according to Modification 1 to which an optical structure for realizing a predetermined light distribution characteristic is applied. FIG. 13 is a first diagram for explaining a modification 2 of the arrangement of the light source. FIG. 14 is a second diagram for explaining a modification 2 of the arrangement of the light source. FIG. 15 is a schematic cross-sectional view of the lighting device according to the second modification. FIG. 16 is a schematic cross-sectional view of a lighting device according to Modification 2 to which an optical structure for realizing a predetermined light distribution characteristic is applied. FIG. 17 is a schematic cross-sectional view of the lighting device according to the second modification, in which a reflective member is provided on the lower side surface. FIG. 18 is a block diagram showing a functional configuration of the lighting device according to the embodiment. FIG. 19 is a flowchart of the operation of the lighting device according to the embodiment. FIG. 20 is an exploded perspective view of the lighting device according to a modified example of the mounting mode.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below are all inclusive or specific examples. Numerical values, shapes, materials, components, arrangement positions of components, connection forms, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept are described as arbitrary components.

Further, each figure is a schematic view and is not necessarily exactly shown. Further, in each figure, the same reference numerals may be given to substantially the same configurations, and duplicate explanations may be omitted or simplified. Further, in the following embodiments, the expression "almost" or "abbreviation" also means that a manufacturing error, a dimensional tolerance, or the like is included.

Further, in the drawings used for explanation in the following embodiments, the coordinate axes may be shown. The Z-axis direction is described as the height direction of the illuminator. The Z-axis + side may be expressed as an upper side (upper side), and the Z-axis-side may be expressed as a lower side (lower side). Further, the X-axis direction and the Y-axis direction are directions orthogonal to each other on a plane perpendicular to the Z-axis direction. In the following embodiments, the plan view means to be viewed from the Z-axis direction.

(Embodiment)
[Overview]
Hereinafter, the outline of the lighting system according to the embodiment will be described. FIG. 1 is an external perspective view of the lighting system according to the embodiment as viewed from above.

As shown in FIG. 1, the lighting system 100 according to the embodiment includes a lighting device 10, a plurality of wiring ducts 70, and a connecting member 71. The plurality of wiring ducts 70 are suspended from the ceiling of an indoor space 80 such as an office. The plurality of wiring ducts 70 are arranged in a grid pattern by being connected by the connecting member 71.

The lighting device 10 is installed on the ceiling side of the interior space 80 and illuminates the interior space 80. If the lighting system 100 includes a plurality of lighting devices 10 and the plurality of lighting devices 10 are laid out in a one-to-one correspondence with a grid structure composed of a plurality of wiring ducts 70, the lighting system 100 has a wide range on the ceiling side. It is possible to realize an indoor space 80 in which the interior space 80 looks shining.

Further, in the lighting system 100, the lighting device 10 is installed by locking from above to a lattice structure composed of a plurality of wiring ducts 70 via a locking structure 21. That is, the lighting device 10 is locked to the wiring duct 70. As a result, the device can be attached to the groove formed on the lower side (Z-axis-side) of each of the plurality of wiring ducts 70. That is, the lighting system 100 can realize an indoor space 80 in which a wide area on the ceiling side can be seen shining while maintaining the main function of the wiring duct 70.

The lighting device 10 also functions as a speaker by using a reflector for reflecting light as a diaphragm. As a result, it is not necessary to separately install a speaker in the indoor space 80, so that it is possible to prevent the speaker from becoming noise in the appearance of the space. That is, according to the lighting device 10, the aesthetic appearance of the interior space 80 can be improved.

Here, the wiring duct 70 is supplemented. The wiring duct 70 is a long member having a groove formed on the lower side, and has a feeding terminal inside. The wiring duct 70 may be called a duct rail or the like. A device such as an outlet or a lighting device having a power receiving structure suitable for the groove is attached to the wiring duct 70, and the wiring duct 70 can supply electric power to these devices via the power feeding terminal.

As shown in FIG. 2, the lighting device 10 is provided from the wiring duct 70 by, for example, attaching a power receiving structure 90 provided at the end of a cable drawn from the main body of the lighting device 10 to the wiring duct 70. Receive power supply. FIG. 2 is a diagram showing an example of the power receiving structure 90. That is, the lighting device 10 is electrically connected to the power feeding terminal in the wiring duct 70 by the power receiving structure 90.

When AC power is supplied from the wiring duct 70, the lighting device 10 includes a power conversion circuit composed of an AC-DC converter, a DC-DC converter, and the like. Further, when DC power is supplied from the wiring duct 70, the AC-DC converter can be omitted in the power conversion circuit built in the lighting device 10.

[Constitution]
Next, a specific configuration of the lighting device 10 included in the lighting system 100 will be described. FIG. 3 is an external perspective view of the lighting device 10 as viewed from above, and FIG. 4 is an external perspective view of the lighting device 10 as viewed from below. FIG. 5 is an exploded perspective view of the lighting device 10, and FIG. 6 is a schematic cross-sectional view of the lighting device 10.

The lighting device 10 includes a frame 20, light sources 30a to 30d, light guide plates 40a to 40d, a reflector plate 50, and a plurality of oscillators 60. It is sufficient that at least one light source 30a to 30d, a light guide plate 40a to 40d, and a plurality of oscillators 60 are provided in the lighting device 10. First, the frame 20 will be described.

The frame 20 is a rectangular annular structure that defines the outer shape of the lighting device 10. The plan view shape of the frame 20 is, for example, a square, but may be a rectangle. The frame 20 holds the reflector 50 on the upper portion, and the reflector 50 is arranged so as to close the opening on the upper portion of the frame 20. Further, the light sources 30a to 30d and the light guide plates 40a to 40d are held inside the four sides of the frame 20. In this way, the frame 20 functions as a holding member that integrally holds the light sources 30a to 30d, the light guide plates 40a to 40d, and the reflector plate 50. The frame 20 is formed of, for example, a resin material, but may be formed of a metal material. A locking structure 21 is provided on each of the outer surface on the X-axis + side and the outer surface on the X-axis − side of the frame 20.

The locking structure 21 is a structure for locking the lighting device 10 to a wiring duct 70 suspended from the ceiling. The locking structure 21 is, for example, a plate-shaped member, and two are provided for one outer surface. The lighting device 10 is placed on the wiring duct 70 so that the lower main surface of the locking structure 21 is in contact with the upper surface of the wiring duct 70. As a result, the lighting device 10 is locked to the wiring duct 70.

Next, the light sources 30a to 30d will be described. The light sources 30a to 30d are long light emitting modules arranged along the four sides of the frame 20. Hereinafter, the light sources 30a will be described on behalf of the light sources 30a to 30d, but the light sources 30b to 30d also have the same structure. The light source 30a is arranged to face the upper side surface 43 of the light guide plate 40a. The light source 30a has a substrate 31 and a plurality of light emitting elements 32.

The substrate 31 is a long rectangular substrate along one side of the frame 20. The shape of the substrate 31 is not particularly limited. Specifically, the substrate 31 is a rigid substrate such as a resin substrate, a ceramic substrate, or a metal base substrate.

The mounting surface of the substrate 31, which is the main surface on which the plurality of light emitting elements 32 are mounted, faces the upper side surface 43 of the light guide plate 40a. The plurality of light emitting elements 32 are arranged side by side in a row along the longitudinal direction of the substrate 31, for example.

The light emitting element 32 is a surface mount type (SMD type) LED element that emits white light. The surface mount type 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. The light emitting element 32 emits white light toward the upper side surface 43 of the light guide plate 40a. The color temperature of the light emitted by the light emitting element 32 is, for example, 2700K to 6500K.

Next, the light guide plates 40a to 40d will be described. The light guide plates 40a to 40d are arranged along the four sides of the frame 20. In other words, the light guide plates 40a to 40d are arranged so as to stand on the four sides along the four sides of the reflector plate 50. Each of the light guide plates 40a to 40d is a long flat plate-shaped optical member having translucency. Each of the light guide plates 40a to 40d is a transparent member, but any member may be used as long as it has translucency. Each of the light guide plates 40a to 40d is formed of, for example, an acrylic resin, but may be formed of a polycarbonate resin, glass, or the like. Hereinafter, the light guide plates 40a will be described on behalf of the light guide plates 40a to 40d, but the light guide plates 40b to 40d also have the same structure.

The light guide plate 40a has a first main surface 41, a second main surface 42, an upper side surface 43, a lower side surface 44, and two lateral side surfaces 45. The first main surface 41 is a main surface facing the inner surface of the frame 20. The first main surface 41 is provided with a reflective structure that reflects light incident on the inside of the light guide plate 40a from the upper side surface 43 (or the lower side surface 44, the lateral side surface 45). The first main surface 41 is provided with a large number of fine recesses (prisms) as a reflective structure. The cross-sectional shape of the recess is, for example, V-shaped, but is not particularly limited.

The second main surface 42 is a main surface facing the second main surface 42 of the other light guide plate 40c. The second main surface 42 is, in other words, a main surface facing away from the first main surface 41. The second main surface 42 is a surface on which the light reflected by the reflection structure is emitted, and emits surface light. The second main surface 42 is, for example, a flat surface, and the second main surface 42 is not provided with a reflection structure. However, as with the first main surface 41, the second main surface 42 may be provided with a large number of fine recesses as a reflective structure.

The upper side surface 43 is an upper side surface of the light guide plate 40a. The upper side surface 43 is an example of the first side surface. The upper side surface 43 is a side surface located on the plus side (that is, the reflector 50 side) in the Z-axis direction. The Z-axis direction is an example of the first direction along the second main surface 42 and intersecting the reflecting surface 52 of the reflecting plate 50, and can be rephrased as the lateral direction of the light guide plate 40a. The upper side surface 43 is, for example, a flat surface. The upper side surface 43 functions as an incident surface on which the light emitted by the light source 30a is incident.

The lower side surface 44 is a lower side surface of the light guide plate 40a. The lower side surface 44 is an example of the second side surface. The lower side surface 44 is a side surface located on the minus side (that is, the interior space 80 side) in the Z-axis direction. The lower side surface 44 is, for example, a flat surface. As will be described later, the lower side surface 44 may be provided with an optical structure or a reflective member.

The lateral side surface 45 is a lateral side surface of the light guide plate 40a. The lateral side surface 45 is an example of the third side surface. In the light guide plate 40a and the light guide plate 40c, the lateral side surface 45 is a side surface located at each of the two ends in the Y-axis direction. The Y-axis direction is an example of the second direction along the second main surface 42 and along the reflection surface 52, and can be rephrased as the longitudinal direction of the light guide plate 40a and the light guide plate 40c. In the light guide plate 40b and the light guide plate 40d, the lateral side surface 45 is a side surface located at each of the two end portions in the X-axis direction. The X-axis direction is another example of the second direction along the second main surface 42 and along the reflection surface 52, and can be rephrased as the longitudinal direction of the light guide plate 40b and the light guide plate 40d. The lateral side surface 45 is, for example, a flat surface.

Next, the reflector 50 will be described. The reflector 50 is a flat plate-shaped member having a rectangular plan view shape. The reflector 50 is arranged so that the reflector 52 intersects the second main surface 42 of the light guide plates 40a to 40d. Further, the reflector 50 is arranged so as to close the opening at the upper part of the frame 20, and the four corners of the reflector 50 are held by the frame 20. Although not shown, a cushioning material (cushion material) is arranged in the gap between the reflector 50 and the frame 20 as needed.

The reflector 50 is formed of, for example, a white acrylic resin (that is, a white resin material) or the like. The reflective plate 50 may be formed of a metal material having light reflectivity such as aluminum, a resin material to which a metal film is added, a white-painted resin material, a white-painted metal material, or the like.

The reflector 50 is a reflecting surface 52 that reflects light emitted from an upper surface 51 (a surface opposite to the reflecting surface 52) to which a plurality of vibrators 60 are connected and a second main surface 42 of the light guide plates 40a to 40d. Has (bottom surface) and. The reflector 50 may have at least a reflective surface 52 having light reflectivity. The reflective surface 52 may be subjected to a surface treatment such as a blast treatment in order to prevent articles and the like around the lighting device 10 from being reflected on the reflective surface 52 when the lighting device 10 is turned off.

Next, the oscillator 60 will be described. The vibrator 60 generates sound from the reflector 50 by vibrating the reflector 50. The sound here does not mean a sound that is inevitably generated such as noise, but a sound that is intentionally generated, and specifically, is a sound based on a sound signal such as music content. The sound output from the reflector 50 due to vibration may include not only the sound in the audible range but also the sound in the non-audible range. That is, the "sound" in the present specification includes not only so-called audible sound but also inaudible sound (ultrasonic wave).

Specifically, the vibrator 60 is connected to the upper surface 51 of the reflector 50, and generates sound from the reflector 52 side of the reflector 50 toward the interior space 80. That is, the vibrator 60 imparts a function as a speaker to the lighting device 10 by using the reflector 50 as a diaphragm. The oscillator 60 is specifically realized by a piezoelectric element, but may be realized by an actuator using a magnetic coil.

The oscillator 60 is arranged along the two opposite sides of the upper surface 51 of the reflector 50. The number and arrangement of the oscillators 60 included in the lighting device 10 are not particularly limited. The lighting device 10 may include at least one oscillator 60, and the arrangement of at least one oscillator 60 may be appropriately determined experimentally or empirically. For example, the oscillator 60 may be arranged at the center of the upper surface 51 of the reflector 50.

As described above, the lighting device 10 functions not only as lighting but also as a speaker. As shown in FIG. 1, the illuminating device 10 can output sound directly under the illuminating device 10, for example.

Generally, in an indoor space 80 such as an office, if a speaker is installed on the floor surface or a wall surface close to the floor surface, a desk or the like may become an obstacle and the sound may be scattered and the audible range may be narrowed. On the other hand, in order to widen the range in which sound can be heard, it is conceivable to arrange the speaker on the ceiling side. Generally, when the speaker is installed on the ceiling side of the interior space 80, the boundary portion between the ceiling surface and the wall surface is adopted as the installation position. Then, the sound is basically output diagonally downward, and there is a possibility that the audible range of the sound becomes too wide.

On the other hand, since the lighting device 10 can output the sound directly below the lighting device 10, the range in which the sound can be heard can be set to an appropriate range. For example, the reachable range R1 of the direct sound emitted by the lighting device 10 (reflector 50) is adjusted so as to be included in the irradiation range R2 of the light emitted by the lighting device 10. FIG. 7 is a diagram showing a reach range R1 of the direct sound emitted by the lighting device 10 and an irradiation range R2 of the light of the lighting device 10.

The relationship between the reachable range R1 of the direct sound and the irradiation range R2 of the light as shown in FIG. 7 is realized, for example, by designing the lighting device 10 as follows. First, the reachable range R1 of the direct sound is determined by, for example, adjusting the number of oscillators 60 and the arrangement of the oscillators 60. After the reach range R1 of the direct sound is determined, the reflection structure (specifically, the shape of the recess) provided in the light guide plates 40a to 40d so that the irradiation range R2 of the light becomes larger than the reach range R1. , Density of recesses, etc.) are adjusted (designed).

As described above, if the direct sound reach range R1 and the light irradiation range R2 are appropriately designed, a space of light and sound separated from the surroundings can be obtained.

[Modification of the structure of the lower surface of the light guide plate]
For the purpose of adjusting the irradiation range R2 of the light emitted by the lighting device 10, the lower side surface 44 of the light guide plates 40a to 40d is provided with a predetermined arrangement of light that passes through the inside of the light guide plate and reaches the lower side surface 44. An optical structure that imparts optical characteristics (hereinafter, also referred to as a second optical structure) may be provided. FIG. 8 is a schematic cross-sectional view of the lighting device 10 to which the first example of the optical structure for realizing such a predetermined light distribution characteristic is applied.

As shown in FIG. 8, the optical structure provided on the lower side surface 44 of the light guide plates 40a and 40c is, for example, an inclined surface 44a (second main surface 42) having an angle different from 90 degrees with respect to the second main surface 42. It is the lower side surface 44 itself that forms an angle different from 90 degrees with respect to. The inclined surface 44a shown in FIG. 8 is an inclined surface such that the lower end portion of the second main surface 42 is located below the lower end portion of the first main surface 41.

In the example of FIG. 8, the inclined surface 44a provided on the lower side surface 44 of the light guide plate 40a has a light distribution characteristic toward the light guide plate 40c side for the light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44. give. Similarly, the inclined surface 44a provided on the lower side surface 44 of the light guide plate 40c gives the light that reaches the lower side surface 44 through the inside of the light guide plate 40c a light distribution characteristic toward the light guide plate 40a side. The light guide plate 40a and the light guide plate 40c are two light guide plates arranged so that the second main surface 42 faces each other. Although not shown, an inclined surface 44a is also provided on the lower side surface 44 of the light guide plate 40b and the lower side surface 44 of the light guide plate 40d.

As described above, if the lower side surface 44 of the light guide plates 40a to 40d is the inclined surface 44a, the direction of the light reaching the inclined surface 44a can be controlled. That is, the inclined surface 44a can be used for adjusting the light irradiation range R2.

Further, FIG. 9 is a schematic cross-sectional view of the lighting device 10 to which the second example of the optical structure for realizing a predetermined light distribution characteristic is applied. As shown in FIG. 9, the optical structure provided on the lower side surface 44 of the light guide plates 40a and 40c may be a light distribution control lens 44b. The light distribution control lens 44b may be integrally formed with the light guide plates 40a and 40c along the longitudinal direction of the light guide plates 40a and 40c, or may be formed separately from the light guide plates 40a and 40c and may be formed separately from the light guide plates 40a and 40c. It may be attached to.

In the example of FIG. 9, the light distribution control lens 44b provided on the lower side surface 44 of the light guide plate 40a distributes light toward the light guide plate 40c side to the light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44. Gives characteristics. Similarly, the light distribution control lens 44b provided on the lower side surface 44 of the light guide plate 40c imparts light distribution characteristics toward the light guide plate 40a side to the light that passes through the inside of the light guide plate 40c and reaches the lower side surface 44. .. The light guide plate 40a and the light guide plate 40c are two light guide plates arranged so that the second main surface 42 faces each other. Although not shown, the light distribution control lens 44b is also provided on the lower side surface 44 of the light guide plate 40b and the lower side surface 44 of the light guide plate 40d.

As described above, if the light distribution control lens 44b is provided on the lower side surface 44 of the light guide plates 40a to 40d, the direction of the light reaching the light distribution control lens 44b can be controlled. That is, the light distribution control lens 44b can be used for adjusting the light irradiation range R2.

Further, a reflective member may be provided on the lower side surface 44 of the light guide plates 40a to 40d. FIG. 10 is a schematic cross-sectional view of the lighting device 10 provided with a reflective member on the lower side surface 44.

As shown in FIG. 10, the lower side surfaces 44 of the light guide plates 40a and 40c are provided with a reflective member 44c that reflects light that passes through the inside of the light guide plate and reaches the lower side surface 44. The reflective member 44c is, for example, a metal material (mirror) such as aluminum, but may be a resin material to which a metal film is added, a white resin material, a white-painted metal material, or the like. Although not shown, the reflective member 44c is also provided on the lower side surfaces 44 of the light guide plates 40b and 40d.

As described above, if the reflective member 44c is provided on the lower side surface 44 of the light guide plates 40a to 40d, the light reaching the reflective member 44c can be reflected to the light guide plates 40a to 40d and used as indirect light.

[Transformation example 1 of arrangement of light source]
In the lighting device 10, the light sources 30a to 30d are arranged to face the upper side surfaces 43 of the light guide plates 40a to 40d, and the light emitted by the light sources 30a to 30d is incident on the upper side surfaces 43 of the light guide plates 40a to 40d. However, the arrangement of the light sources 30a to 30d is not limited to such an arrangement. Hereinafter, a modification 1 of the arrangement of the light sources 30a to 30d will be described. FIG. 11 is a schematic cross-sectional view of a lighting device (illumination device according to the modification 1) to which the modification 1 of the arrangement of the light sources 30a to 30d is applied.

In the lighting device 10a according to the first modification, the arrangement of the frame 20, the light guide plates 40a to 40d, the reflector plate 50, and the plurality of oscillators 60 is the same as that of the lighting device 10. The light sources 30a to 30d included in the lighting device 10a are arranged to face the lower side surfaces 44 of the light guide plates 40a to 40d, and the light emitted by the light sources 30a to 30d is incident on the lower side surfaces 44 of the light guide plates 40a to 40d. The configurations of the light sources 30a to 30d are as described above. The light sources 30a to 30d are held, for example, by the frame 20 at positions facing the lower side surfaces 44 of the light guide plates 40a to 40d.

In such a lighting device 10a, the upper side surfaces 43 of the light guide plates 40a to 40d have an optical structure (hereinafter, first) that imparts predetermined light distribution characteristics to the light that passes through the inside of the light guide plate and reaches the upper side surface 43. (Also described as an optical structure) may be provided. FIG. 12 is a schematic cross-sectional view of the lighting device 10a to which an optical structure for realizing such a predetermined light distribution characteristic is applied.

As shown in FIG. 12, the optical structure provided on the upper side surfaces 43 of the light guide plates 40a and 40c is, for example, an inclined surface 43a (second main surface 42) having an angle different from 90 degrees with respect to the second main surface 42. The upper side surface 43 itself, which forms an angle different from 90 degrees with respect to the object. The inclined surface 43a shown in FIG. 12 is an inclined surface such that the upper end portion of the second main surface 42 is located above the upper end portion of the first main surface 41.

In the example of FIG. 12, the inclined surface 43a provided on the upper side surface 43 of the light guide plate 40a imparts optical characteristics toward the reflector 50 side to the light that passes through the inside of the light guide plate 40a and reaches the upper side surface 43. .. Similarly, the inclined surface 43a provided on the upper side surface 43 of the light guide plate 40c imparts a light distribution characteristic toward the reflector 50 side to the light that passes through the inside of the light guide plate 40c and reaches the upper side surface 43. Although not shown, an inclined surface 43a is also provided on the upper side surface 43 of the light guide plate 40b and the light guide plate 40d.

As described above, if the upper side surface 43 of the light guide plates 40a to 40d is the inclined surface 43a, the light that reaches the inclined surface 43a can be used as indirect light. For example, when the indirect light goes to the reflector 50, the brightness of the light emitting region when the lighting device 10a is viewed from directly below can be made uniform.

The optical structure provided on the upper side surface 43 of the light guide plates 40a to 40d is not limited to the inclined surface 43a. For example, a light distribution control lens may be provided on the upper side surface 43 of the light guide plates 40a to 40d.

[Modification 2 of the arrangement of the light source]
Next, a modification 2 of the arrangement of the light sources 30a to 30d will be described. 13 and 14 are diagrams for explaining a modification 2 of the arrangement of the light sources 30a to 30d. FIG. 15 is a schematic cross-sectional view of a lighting device (illumination device according to the modification 2) to which the modification 2 of the arrangement of the light sources 30a to 30d is applied. In the following modification 2, the light source corresponding to the light sources 30a to 30d is referred to as a light source 30. The light source 30 differs in the length of the substrate 31 and the number of light emitting elements 32, but the basic configuration is the same as that of the light sources 30a to 30d.

In the second modification shown in FIGS. 13 and 14, the light source 30 is arranged to face the side surface 45 of the light guide plates 40a to 40d, and the light emitted by the light source 30 is incident on the side surface 45 of the light guide plates 40a to 40d. do. In the example of FIG. 13, two light sources 30 correspond to one light guide plate 40a. Specifically, the light source 30 is arranged to face each of the two lateral sides 45 of one light guide plate 40a, and the optical axis of the light source 30 is orthogonal to the lateral side surface 45 to which the light source faces. In this case, since the lighting device 10b is provided with two light sources 30 for each of the four light guide plates 40a to 40d, a total of eight light sources 30 are provided.

On the other hand, in the example of FIG. 14, the light source 30 is arranged at each of the four corners of the rectangular ring formed by the light guide plates 40a to 40d. That is, the lighting device 10b includes four light sources 30. In the example of FIG. 14, one light source 30 can incident light on the lateral side surface 45 of the two light guide plates (in the example of FIG. 14, the light guide plates 40a and 40d).

The lighting device 10b according to the second modification shown in FIG. 15 is a lighting device to which the arrangement of the light source 30 of FIG. 13 or FIG. 14 is applied. In such a lighting device 10b, even if the upper side surfaces 43 of the light guide plates 40a to 40d are provided with an optical structure that gives a predetermined light distribution characteristic to the light that passes through the inside of the light guide plate and reaches the upper side surface 43. good. Further, the lower side surface 44 of the light guide plates 40a to 40d may be provided with an optical structure that gives a predetermined light distribution characteristic to the light that passes through the inside of the light guide plate and reaches the lower side surface 44. FIG. 16 is a schematic cross-sectional view of a lighting device 10b to which an optical structure for realizing a predetermined light distribution characteristic is applied.

As shown in FIG. 16, the optical structure provided on the upper side surfaces 43 of the light guide plates 40a and 40c of the lighting device 10b is, for example, an inclined surface 43a (first) having an angle different from 90 degrees with respect to the second main surface 42. The upper side surface 43 itself, which forms an angle different from 90 degrees with respect to the two main surfaces 42). The specific configuration of the inclined surface 43a is as described above. Although not shown, an inclined surface 43a is also provided on the upper side surface 43 of the light guide plate 40b and the light guide plate 40d.

As described above, if the upper side surface 43 of the light guide plates 40a to 40d is the inclined surface 43a, the light that reaches the inclined surface 43a can be used as indirect light. For example, when the indirect light goes to the reflector 50, the brightness of the light emitting region when the lighting device 10a is viewed from directly below can be made uniform.

The optical structure provided on the upper side surface 43 of the light guide plates 40a to 40d is not limited to the inclined surface 43a. For example, a light distribution control lens may be provided on the upper side surface 43 of the light guide plates 40a to 40d.

Further, the optical structure provided on the lower side surfaces 44 of the light guide plates 40a and 40c of the lighting device 10b is, for example, a light distribution control lens 44b. The light distribution control lens 44b may be integrally formed with the light guide plates 40a and 40c along the longitudinal direction of the light guide plates 40a and 40c, or may be formed separately from the light guide plates 40a and 40c and may be formed separately from the light guide plates 40a and 40c. It may be attached to. The specific configuration of the light distribution control lens 44b is as described above. Although not shown, a light distribution control lens 44b is also provided on the light guide plate 40b and the lower side surface 44 of the light guide plate 40d.

As described above, if the light distribution control lens 44b is provided on the lower side surface 44 of the light guide plates 40a to 40d, the direction of the light reaching the lower side surface 44 can be controlled. That is, the light distribution control lens 44b can be used for adjusting the light irradiation range R2 (described above).

The optical structure provided on the lower side surface 44 of the light guide plates 40a to 40d is not limited to the light distribution control lens 44b. For example, the lower side surface 44 of the light guide plates 40a to 40d may be provided with an inclined surface 44a similar to that in FIG. 8 as an optical structure. If the light distribution control lens 44b is provided on the lower side surface 44 of the light guide plates 40a to 40d, the direction of the light reaching the light distribution control lens 44b can be controlled. That is, the light distribution control lens 44b can be used for adjusting the light irradiation range R2 (described above).

Further, FIG. 16 shows an example in which an optical structure is provided on each of the upper side surface 43 and the lower side surface 44 of the light guide plates 40a to 40d, but any of the upper side surface 43 and the lower side surface 44 of the light guide plates 40a to 40d. Only the crab may be provided with an optical structure. That is, an optical structure may be provided on at least one of the upper side surface 43 and the lower side surface 44 of the light guide plates 40a to 40d.

Further, a reflective member may be provided on the lower side surface 44 of the light guide plates 40a to 40d. FIG. 17 is a schematic cross-sectional view of the lighting device 10b provided with a reflective member on the lower side surface 44.

As shown in FIG. 17, the lower side surfaces 44 of the light guide plates 40a and 40c are provided with a reflective member 44c that reflects light that passes through the inside of the light guide plate and reaches the lower side surface 44. The specific configuration of the reflective member 44c is as described above. Although not shown, the reflective member 44c is also provided on the lower side surfaces 44 of the light guide plates 40b and 40d.

As described above, if the reflective member 44c is provided on the lower side surface 44 of the light guide plates 40a to 40d, the light reaching the reflective member 44c can be reflected to the light guide plates 40a to 40d and used as indirect light.

[Functional configuration]
Next, the functional configuration of the lighting device 10 will be described. FIG. 18 is a block diagram showing a functional configuration of the lighting device 10. In the following functional configuration and description of the operation, the two light sources of the light sources 30a to 30d are the first light source 91, and the remaining two light sources of the light sources 30a to 30d are the second light sources. Explained as being. Further, although the functional configuration and operation of the lighting device 10 will be described below, the lighting devices 10a and 10b also have the same functional configuration and can perform the same operation.

As shown in FIG. 18, the lighting device 10 includes a first light source 91, a second light source 92, a first light emission control circuit 93, a second light emission control circuit 94, a control unit 95, a storage unit 96, a communication unit 97, and , The vibrator 60 is provided. In FIG. 18, in addition to the lighting device 10, the lighting controller 110 is also shown. In FIG. 18, only one first light source 91, second light source 92, and oscillator 60 are shown. Since the specific configuration of the oscillator 60 is as described above, the description thereof will be omitted.

The first light source 91 is, for example, a light source that emits white light having a high color temperature (for example, a color temperature of 6500K), and the second light source 92 is, for example, emitting white light having a low color temperature (for example, a color temperature of 2700K). .. As described above, the lighting device 10 may be provided with two types of light sources having different emission colors and may support a toning function.

The first light emission control circuit 93 is a circuit that supplies voltage and current to the first light source 91 based on the control of the control unit 95. Specifically, the first light emission control circuit 93 is a dimming circuit such as a PWM (Pulse Width Modulation) control circuit.

The second light emission control circuit 94 is a circuit that supplies voltage and current to the second light source 92 based on the control of the control unit 95. Specifically, the second light emission control circuit 94 is a dimming circuit such as a PWM control circuit.

The control unit 95 controls the light emission of the first light source 91 via the first light emission control circuit 93, and controls the light emission of the second light source 92 via the second light source control circuit 94. That is, the control unit 95 can independently control the light emission (dimming control) of the first light source 91 and the second light source 92, whereby the lighting device 10 has a dimming function and a toning function. ing. Further, the control unit 95 acquires a sound signal from the storage unit 96 and controls the vibrator 60 based on the acquired sound signal. Such a control unit 95 is realized by a microcomputer, for example, but may be realized by a processor.

The storage unit 96 is a storage device that stores a program executed by the control unit 95 and a sound source (sound signal) of sound emitted from the reflector 50. Specifically, the storage unit 96 is realized by a semiconductor memory or the like. The sound signal includes an audio signal (for example, a signal based on the vibration of a human voice band) and an acoustic signal (for example, a signal such as music to be played or a sound effect).

The communication unit 97 is a communication circuit for the lighting device 10 to communicate with the lighting controller 110. The communication performed by the communication unit 97 may be wired communication or wireless communication. The communication standard for communication performed by the communication unit 97 is not particularly limited.

The lighting controller 110 is a user interface device operated by the user to send an instruction to the lighting device 10. The lighting controller 110 is, for example, a dedicated remote controller for the lighting device 10, but may be a mobile terminal (smartphone, tablet terminal, etc.) in which a dedicated application program is installed.

[motion]
Next, an example of the operation of the lighting device 10 will be described. FIG. 19 is a flowchart of the operation of the lighting device 10.

First, the lighting device 10 emits light at a brightness and a color temperature specified by the user (S11). The user can specify, for example, the brightness and color temperature of the lighting device 10 via the lighting controller 110.

When the user performs an operation instructing the lighting controller 110 to reproduce the sound in this state, the communication unit 97 receives an instruction signal instructing the reproduction of the sound from the lighting controller 110 (S12). The control unit 95 reads a sound signal to be instructed from the storage unit 96 based on the received instruction signal, and vibrates the vibrator 60 based on the read sound signal to generate sound from the reflector 50. Generate (S13). That is, the sound signal (sound indicated by the sound signal) is reproduced. The sound signal is a sound signal of a direct sound to be emitted from the reflector 50, and specifically, a sound signal of music content or the like.

The sound signal may be stored in the storage unit 96 in advance, or is acquired from the lighting controller 110 (or other external device) together with the instruction signal in step S12 and temporarily stored in the storage unit 96. It may be (buffered).

Further, at this time, the control unit 95 may control at least one of the brightness and the color temperature of the lighting device 10 based on the sound signal (S14). That is, the control unit 95 controls the light emission of the first light source 91 and the second light source 92 based on the sound signal, so that the light emitted by the light guide plates 40a to 40d and the sound emitted by the reflector 50 are interlocked with each other. May be good.

For example, the control unit 95 detects the amplitude of the sound signal (that is, the intensity of the sound), and changes at least one of the brightness and the color temperature of the lighting device 10 according to the change in the amplitude. Further, the control unit 95 may specify the tone or rhythm by analyzing the sound signal, and may change at least one of the brightness and the color temperature of the lighting device 10 according to the specified tone or rhythm.

In this way, the lighting device 10 can improve the sense of presence by changing the sound and the light in conjunction with each other in the interior space 80.

[Modified example of mounting mode]
In the above embodiment, the lighting device 10 is locked to the wiring duct 70 by the locking structure 21, and is supplied with electric power from the wiring duct 70 by the power receiving structure 90. However, the lighting device 10 is not limited to such a mounting mode. FIG. 20 is an exploded perspective view of the lighting device according to a modified example of the mounting mode.

The lighting device 10c shown in FIG. 20 is connected to the main body portion 11c having a configuration in which the locking structure 21 is omitted in the lighting device 10, the cover 12c that covers the main body portion 11c from above, and the cover 12c via a cable 13c. It comprises the attached mounting structure 14c. The lighting device 10c can operate by receiving electric power from the hook ceiling body by mounting the mounting structure 14c on the hook ceiling body provided on the ceiling. As described above, the present invention may be realized as a lighting device 10c that is attached to the hook ceiling body and receives electric power from the hook ceiling body.

Although the pendant type lighting device 10c is shown in FIG. 20, the present invention has been realized as a lighting device directly installed on the ceiling by using a lighting fixture adapter attached to a hook ceiling body. May be good. Further, the modified examples of these mounting modes can be applied not only to the lighting device 10, but also to the lighting device 10a and the lighting device 10b.

[Effects, etc.]
As described above, the lighting device 10 includes a light guide plate 40a having a light source 30a, a side surface on which the light emitted by the light source 30a is incident, and a second main surface 42 on which the light incident on the side surface is emitted. It has a reflecting surface 52 that reflects light emitted from the main surface 42, and vibrates the reflecting plate 50 and the reflecting plate 50 arranged so that the reflecting surface 52 intersects the second main surface 42 of the light guide plate 40a. This includes a vibrator 60 that generates sound.

Such a lighting device 10 can function as a speaker by using the reflector 50 as a diaphragm.

Further, the light guide plate 40a is on the upper side surface 43 located along the second main surface 42 and on the side of the reflector 50 in the first direction intersecting with the reflection surface 52, and on the side opposite to the upper side surface 43 in the first direction. It has a lower side surface 44 to be located. The lower side surface 44 is provided with a second optical structure that imparts a predetermined light distribution characteristic to the light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44. The upper side surface 43 is an example of the first side surface, and the lower side surface 44 is an example of the second side surface.

Such a lighting device 10 can control the light distribution of light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44.

Further, the second optical structure is an inclined surface 44a having an angle different from 90 ° with respect to the second main surface 42.

In such a lighting device 10, the light distribution of light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44 can be controlled by the inclined surface 44a.

The second optical structure is a light distribution control lens 44b.

In such a lighting device 10, the light distribution of light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44 can be controlled by the light distribution control lens 44b.

Further, the lighting device 10 includes a light guide plate 40a and a light guide plate 40c, which are two light guide plates arranged so that the second main surface 42 faces each other. The light guide plate 40a is an example of the first light guide plate, and the light guide plate 40c is an example of the second light guide plate. The second optical structure provided on the lower side surface 44 of the light guide plate 40a imparts a light distribution characteristic toward the light guide plate 40c side to the light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44. The second optical structure provided on the lower side surface 44 of the light guide plate 40c gives light distribution characteristics toward the light guide plate 40a side to the light that passes through the inside of the light guide plate 40c and reaches the lower side surface 44.

In such a lighting device 10, the irradiation range R2 of the light emitted by the lighting device 10 can be adjusted by the second optical structure.

Further, the lower side surface 44 is provided with a reflective member 44c that reflects light that passes through the inside of the light guide plate 40a and reaches the lower side surface 44.

Such a lighting device 10 can reflect the light that reaches the reflecting member 44c toward the light guide plates 40a to 40d and use it as indirect light.

Further, in the lighting device 10, the light source 30a is arranged to face the upper side surface 43, and the light emitted by the light source 30a is incident on the upper side surface 43.

In such a lighting device 10, the light guide plate 40a can be made to emit light by the light incident from the upper side surface 43.

Further, the light guide plate 40a has a lateral side surface 45 located along the second main surface 42 and at the end in the second direction along the reflection surface 52. In the lighting device 10b, the light source 30a is arranged to face the lateral side surface 45, and the light emitted by the light source 30a is incident on the lateral side surface 45. The lateral side surface 45 is an example of the third side surface.

In such a lighting device 10b, the light guide plate 40a can be made to emit light by the light incident from the lateral side surface 45.

Further, in the lighting device 10a, the light source 30a is arranged to face the lower side surface 44, and the light emitted by the light source 30a is incident on the lower side surface 44.

In such a lighting device 10a, the light guide plate 40a can be made to emit light by the light incident from the lower side surface 44.

Further, the upper side surface 43 is provided with a first optical structure that gives a predetermined light distribution characteristic to the light that passes through the inside of the light guide plate 40a and reaches the upper side surface 43. The first optical structure is an inclined surface 43a or a light distribution control lens.

Such a lighting device 10a (or a lighting device 10b) can control the light distribution of light that passes through the inside of the light guide plate 40a and reaches the upper side surface 43.

Further, the vibrator 60 is connected to the upper surface 51 on the opposite side of the reflecting surface 52 of the reflecting plate 50.

Such a lighting device 10 can suppress the oscillator 60 from being a shadow of the light emitted by the light guide plates 40a to 40d.

Further, the reachable range R1 of the direct sound generated by the reflector 50 due to the vibration by the vibrator 60 is included in the light irradiation range R2 of the lighting device 10.

According to such a lighting device 10, it is possible to obtain a sound space separated from the surroundings.

Further, the lighting device 10 further includes a control unit 95 that acquires a sound signal of the direct sound to be emitted from the reflector 50 and controls the vibrator 60 based on the acquired sound signal.

Such a lighting device 10 can output sound based on a sound signal such as music content.

Further, the control unit 95 further controls the light emission of the light source 30a based on the acquired sound signal, so that the light emitted by the light guide plate 40a and the sound emitted by the reflector 50 are interlocked with each other.

Such a lighting device 10 can improve the sense of presence in the indoor space 80.

Further, the lighting device 10 is installed on the ceiling side of the indoor space 80.

Since such a lighting device 10 can output light and sound directly under the lighting device 10, the effect that the light and sound are not easily blocked by an obstacle such as a desk can be obtained.

Further, the lighting device 10 further includes a locking structure 21 for locking the lighting device 10 to the wiring duct 70 suspended from the ceiling.

Such a lighting device 10 can be locked to the wiring duct 70.

Further, the lighting device 10 further has a power receiving structure 90 for receiving power supply from the wiring duct 70.

Such a lighting device 10 can receive electric power from the wiring duct 70.

Further, the lighting device 10 operates using the DC power supplied from the wiring duct 70.

Such a lighting device 10 can simplify and miniaturize the power conversion circuit included in the lighting device 10 as compared with the case where AC power is supplied from the wiring duct 70. Therefore, it becomes easy to reduce the size and thickness of the lighting device 10.

(Other embodiments)
Although the embodiments have been described above, the present invention is not limited to the above embodiments.

For example, in the above embodiment, the indoor space has been described as a space for office use, but it may be a space for store use or a space in a house. Further, the interior space may be a space for other purposes.

Further, in the above embodiment, although it has been described that the lighting device is installed on the ceiling (or the ceiling side), it may be installed on the wall.

Further, in the above embodiment, a so-called SMD type light emitting module is used as the light source, but the specific mode of the light source is not particularly limited. For example, a COB (Chip On Board) type light emitting module may be used as the light source. Further, as the light source, a light emitting module including a solid light emitting element other than the LED such as an organic EL element or an inorganic EL element may be used.

Further, in the above embodiment, another processing unit may execute the processing executed by the specific processing unit. Further, the order of the plurality of processes may be changed, or the plurality of processes may be executed in parallel.

Further, in the above embodiment, each component may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.

In addition, each component may be realized by hardware. For example, a component such as a control unit may be a circuit (or an integrated circuit). These circuits may form one circuit as a whole, or may be separate circuits from each other. Further, each of these circuits may be a general-purpose circuit or a dedicated circuit.

In addition, general or specific embodiments of the present invention may be realized in a recording medium such as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM. Further, it may be realized by any combination of a system, an apparatus, a method, an integrated circuit, a computer program and a recording medium. For example, the present invention may be realized as the lighting system of the above embodiment.

In addition, it is realized by a form obtained by applying various modifications to each embodiment that a person skilled in the art can think of, or by arbitrarily combining the components and functions in each embodiment within the range not deviating from the gist of the present invention. Also included in the present invention.

10, 10a, 10b, 10c Lighting equipment 21 Locking structure 30, 30a, 30b, 30c, 30d Light source 40a, 40b, 40c, 40d Light guide plate 41 First main surface 42 Second main surface 43 Upper side surface (first side surface)
43a Inclined surface (first optical structure)
44 Lower side (second side)
44a Inclined surface (second optical structure)
44b Light distribution control lens (second optical structure)
44c Reflective member 45 Lateral side surface (third side surface)
50 Reflector 51 Top surface 52 Reflector surface 60 Oscillator 90 Power receiving structure 91 First light source (light source)
92 Second light source (light source)
95 Control unit

Claims (18)

Light source and
A light guide plate having a side surface on which the light emitted by the light source is incident and a main surface on which the light incident on the side surface is emitted.
A reflector having a reflecting surface that reflects light emitted from the main surface and arranged so that the reflecting surface intersects the main surface of the light guide plate.
A lighting device including a vibrator that generates sound by vibrating the reflector. The light guide plate is located on the first side surface along the main surface and on the side of the reflector in the first direction intersecting the reflection surface, and on the side opposite to the first side surface in the first direction. Has a second side and
The lighting device according to claim 1, wherein the second side surface is provided with a second optical structure that imparts a predetermined light distribution characteristic to light that passes through the inside of the light guide plate and reaches the second side surface. The illuminating device according to claim 2, wherein the second optical structure is an inclined surface having an angle different from 90 ° with respect to the main surface. The lighting device according to claim 2, wherein the second optical structure is a light distribution control lens. The lighting device includes two light guide plates, a first light guide plate and a second light guide plate, which are arranged so that the main surfaces face each other.
The second optical structure provided on the second side surface of the first light guide plate is arranged toward the second light guide plate side by light that passes through the inside of the first light guide plate and reaches the second side surface. Gives light characteristics,
The second optical structure provided on the second side surface of the second light guide plate is arranged toward the first light guide plate side by the light that passes through the inside of the second light guide plate and reaches the second side surface. The lighting device according to any one of claims 2 to 4, which imparts optical characteristics. The light guide plate is located on the first side surface along the main surface and on the side of the reflector in the first direction intersecting the reflection surface, and on the side opposite to the first side surface in the first direction. Has a second side and
The lighting device according to claim 1, wherein the second side surface is provided with a reflective member that reflects light that passes through the inside of the light guide plate and reaches the second side surface. The light guide plate is located on the first side surface along the main surface and on the side of the reflector in the first direction intersecting with the reflection surface, and on the side opposite to the first side surface in the first direction. Has a second side and
The light source is arranged so as to face the first side surface.
The lighting device according to any one of claims 1 to 6, wherein the light emitted by the light source is incident on the first side surface. The light guide plate has a third side surface located at an end in a second direction along the main surface and along the reflective surface.
The light source is arranged so as to face the third side surface.
The lighting device according to any one of claims 1 to 6, wherein the light emitted by the light source is incident on the third side surface. The light guide plate is located on the first side surface along the main surface and on the side of the reflector in the first direction intersecting with the reflection surface, and on the side opposite to the first side surface in the first direction. Has a second side and
The light source is arranged so as to face the second side surface.
The lighting device according to claim 1, wherein the light emitted by the light source is incident on the second side surface. The light guide plate is located on the first side surface along the main surface and on the side of the reflector in the first direction intersecting with the reflection surface, and on the side opposite to the first side surface in the first direction. Has a second side and
The lighting device according to claim 8 or 9, wherein the first side surface is provided with a first optical structure that imparts a predetermined light distribution characteristic to light that passes through the inside of the light guide plate and reaches the first side surface. The lighting device according to any one of claims 1 to 10, wherein the vibrator is connected to a surface of the reflector opposite to the reflective surface. The lighting device according to any one of claims 1 to 11, wherein the range of direct sound generated by the reflector due to vibration by the vibrator is included in the light irradiation range of the lighting device. Further, the item according to any one of claims 1 to 12, further comprising a control unit that acquires a sound signal of a direct sound to be emitted from the reflector and controls the vibrator based on the acquired sound signal. Lighting device. The lighting device according to claim 13, wherein the control unit further controls light emission of the light source based on the acquired sound signal to link the light emitted by the light guide plate and the sound emitted by the reflector. The lighting device according to any one of claims 1 to 14, wherein the lighting device is installed on the ceiling side of an indoor space. The lighting device according to claim 15, further comprising a locking structure for locking the lighting device to a wiring duct suspended from the ceiling. The lighting device according to claim 16, further comprising a power receiving structure for receiving power supply from the wiring duct. The lighting device according to claim 17, wherein the lighting device operates using DC power supplied from the wiring duct.

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