WO2021200068A1

WO2021200068A1 - Illumination device

Info

Publication number: WO2021200068A1
Application number: PCT/JP2021/010372
Authority: WO
Inventors: 孝典明田; 田中　健一郎; 聡兵頭
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2020-03-30
Filing date: 2021-03-15
Publication date: 2021-10-07
Also published as: JPWO2021200068A1; JP7262089B2

Abstract

An illumination device (10) comprises: first light sources (21); a light guide plate (40) that, upon incidence of light emitted by the first light sources (21) on end sections, emits light from a surface; and oscillators (30) that oscillate the light guide plate (40) so as to cause a sound to be generated.

Description

Lighting device

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. 2004-127931

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

The lighting device according to one aspect of the present invention includes a light source, a light guide plate that emits surface light when the light emitted by the light source is incident on the end portion, and a vibrator that generates sound by vibrating the light guide 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. FIG. 2 is a diagram showing an example of a mounting structure. FIG. 3 is an external perspective view of the lighting device according to the embodiment. FIG. 4 is an exploded perspective view of the lighting device according to the embodiment. FIG. 5 is a diagram showing the reachable range of the direct sound emitted by the lighting device according to the embodiment and the light irradiation range of the lighting device. FIG. 6 is a block diagram showing a functional configuration of the lighting device according to the embodiment. FIG. 7 is a flowchart of the operation of the lighting device according to the embodiment. FIG. 8 is an exploded perspective view of the lighting device according to the modified example.

Hereinafter, embodiments will be described with reference to the drawings. Each of the embodiments described below provides a comprehensive or specific example. 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.

Also, each figure is a schematic diagram and is not necessarily exactly illustrated. Further, in each figure, substantially the same configuration may be designated by the same reference numerals, and duplicate description 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.

In addition, coordinate axes may be shown in the drawings used for explanation in the following embodiments. 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, plan view means viewing 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 shown in FIG. 1, the lighting system 100 according to the embodiment includes a lighting device 10, a plurality of wiring ducts 50, and a connecting member 51. The plurality of wiring ducts 50 are suspended from the ceiling of an indoor space 60 such as an office. The plurality of wiring ducts 50 are arranged in a grid pattern by being connected by the connecting member 51.

The lighting device 10 is provided with a light guide plate 40 that emits light from the surface, and is installed on the ceiling side of the indoor space 60. 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 50, the lighting system 100 has a wide range on the ceiling side. It is possible to realize an indoor space 60 in which the light appears to shine.

Further, in the lighting system 100, the lighting device 10 is hooked from above to a lattice structure composed of a plurality of wiring ducts 50 via a locking structure 72. That is, the lighting device 10 is locked to the wiring duct 50. 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 50. That is, the lighting system 100 can realize an indoor space 60 in which a wide area on the ceiling side can be seen shining while maintaining the main function of the wiring duct 50.

The lighting device 10 also functions as a speaker by using the light guide plate 40 as a diaphragm. As a result, it is not necessary to separately install a speaker in the indoor space 60, 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 indoor space 60 can be improved.

Here, supplement the wiring duct 50. The wiring duct 50 is a long member having a groove formed on the lower side, and is provided with a power supply terminal inside. The wiring duct 50 may be called a duct rail or the like. Equipment such as an outlet or a lighting device having a mounting structure suitable for the groove is attached to the wiring duct 50, and the wiring duct 50 can supply electric power to these devices via the power supply terminal.

As shown in FIG. 2, the lighting device 10 can be mounted on the wiring duct 50 by attaching the mounting structure 80 provided at the end of the cable pulled out from the main body of the lighting device 10, for example, from the wiring duct 50. Receive power supply. FIG. 2 is a diagram showing an example of a mounting structure. That is, the lighting device 10 is electrically connected to the power supply terminal in the wiring duct 50 by the mounting structure 80.

When AC power is supplied from the wiring duct 50, the lighting device 10 incorporates 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 50, the AC-DC converter can be omitted in the power conversion circuit built in the lighting device 10.

[composition]
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, and FIG. 4 is an exploded perspective view of the lighting device 10.

The lighting device 10 includes two first light sources 21, two second light sources 22, a plurality of vibrators 30, a light guide plate 40, and a frame 70.

First, the first light source 21 and the second light source 22 will be described. The first light source 21 is arranged to face each of the end face on the X-axis + side of the light guide plate 40 and the end face on the X-axis-side of the light guide plate 40, and the end face (or guide) on the X-axis + side of the light guide plate 40. It is a light emitting module that emits light toward the end face on the X-axis side of the light plate 40. The first light source 21 has a substrate 21a and a light emitting element 21b.

The substrate 21a is a long rectangular substrate long in the Y-axis direction in the drawing. The longitudinal direction of the substrate 21a is the Y-axis direction, and the lateral direction of the substrate 21a is the Z-axis direction. The shape of the substrate 21a is not particularly limited. Specifically, the substrate 21a is a rigid substrate such as a resin substrate, a ceramic substrate, or a metal base substrate.

The mounting surface of the substrate 21a, which is the main surface on which the plurality of light emitting elements 21b are mounted, faces the end surface on the X-axis + side of the light guide plate 40 (or the end surface on the X-axis-side of the light guide plate 40). The plurality of light emitting elements 21b are arranged side by side in a row along the longitudinal direction of the substrate 21a, for example.

The light emitting element 21b is a surface mount type (Surface Mount Device: 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 sealed in the cavity. The light emitting element 21b emits white light having a high color temperature (for example, a color temperature of 6500K) toward the end face on the X-axis + side (or the end face on the X-axis-side of the light guide plate 40).

The second light source 22 is arranged to face each of the Y-axis + side end face of the light guide plate 40 and the Y-axis-side end face of the light guide plate 40, and the Y-axis + side end face (or guide) of the light guide plate 40. This is a light emitting module that emits light toward the Y-axis-side end surface of the light plate 40. The second light source 22 has a substrate 22a and a light emitting element 22b.

The substrate 22a is a long rectangular substrate long in the X-axis direction in the drawing. The longitudinal direction of the substrate 22a is the X-axis direction, and the lateral direction of the substrate 22a is the Z-axis direction. The shape of the substrate 22a is not particularly limited. Specifically, the substrate 22a is a rigid substrate such as a resin substrate, a ceramic substrate, or a metal base substrate.

The mounting surface of the substrate 22a, which is the main surface on which the plurality of light emitting elements 22b are mounted, faces the end surface on the Y-axis + side of the light guide plate 40 (or the end surface on the Y-axis-side of the light guide plate 40). The plurality of light emitting elements 22b are arranged side by side in a row along the longitudinal direction of the substrate 22a, for example.

The light emitting element 22b is a surface mount type (Surface Mount Device: 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 sealed in the cavity. The light emitting element 22b emits white light having, for example, a low color temperature (for example, a color temperature of 2700 K) toward the end face on the Y-axis + side (or the end face on the Y-axis-side of the light guide plate 40).

As described above, the lighting device 10 is provided with two types of light sources having different emission colors, and corresponds to the toning function as described later. It is not essential that the lighting device 10 corresponds to the toning function, and the emission colors of the first light source 21 and the second light source 22 may be substantially the same. Further, the lighting device 10 may be provided with at least one light source facing one end surface of the light guide plate 40, and it is not essential to include four light sources.

Next, the vibrator 30 will be described. The vibrator 30 generates sound from the light guide plate 40 by vibrating the light guide plate 40. 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 light guide plate 40 due to vibration may include not only sound in the audible range but also 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 30 is installed on the first main surface 41 of the light guide plate 40, and generates sound from the second main surface 42 side of the light guide plate 40 toward the indoor space 60. That is, the vibrator 30 imparts a function as a speaker to the lighting device 10 by using the light guide plate 40 as a diaphragm. The vibrator 30 is specifically realized by a piezoelectric element, but may be realized by an actuator using a magnetic coil.

More specifically, the plurality of vibrators 30 are arranged on the outer peripheral portion of the first main surface 41 of the light guide plate 40 at intervals of two from one side of the light guide plate 40. That is, the lighting device 10 includes a total of eight vibrators 30. The number and arrangement of the vibrators 30 included in the lighting device 10 are not particularly limited, and may be appropriately determined experimentally or empirically. For example, the vibrator 30 may be arranged at the center of the first main surface 41 of the light guide plate 40. Further, the vibrator 30 may be arranged on the second main surface 42 of the light guide plate 40.

The surface of the vibrator 30 facing the first main surface 41 (that is, the surface in contact with the light guide plate 40) is formed by a reflective member that reflects the light emitted by the light guide plate 40. As a result, when the light guide plate 40 during light emission is viewed from the second main surface 42 side, the vibrator 30 is prevented from being shadowed. The reflective member is, for example, a metal member such as silver or tungsten, but may be a member having a relatively high reflectance to white light.

The light guide plate 40 emits surface light when the light emitted by the first light source 21 and the light emitted by the second light source 22 are incident on the end face (end portion). The light guide plate 40 is a flat plate-shaped optical member having a rectangular plan view shape. The light guide plate 40 is a transparent member, but may be a member having translucency. The light guide plate 40 is made of, for example, acrylic, but may be made of polycarbonate, glass, or the like.

The light guide plate 40 has a first main surface 41 and a second main surface 42. The first main surface 41 is the main surface on the upper side (Z-axis + side) of the light guide plate 40. The first main surface 41 is a main surface to which a plurality of vibrators 30 are connected and provided with a reflection structure for reflecting light incident on the inside of the light guide plate 40. 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 the main surface on the lower side (Z-axis-side) of the light guide plate 40. 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 flat surface. Although the second main surface 42 is not provided with a reflective structure, a large number of fine recesses may be provided as the reflective structure as in the case of the first main surface 41.

The frame 70 is a frame-shaped structure having an opening 71 that exposes the second main surface 42 to the indoor space 60. The frame 70 functions as a holding member that integrally holds the two first light sources 21, the two second light sources 22, and the light guide plate 40. The frame 70 is made of, for example, a resin material, but may be made of a metal material. A locking structure 72 is provided at each of the X-axis + side end and the X-axis-side end of the frame 70.

The locking structure 72 is a structure for locking the lighting device 10 to the wiring duct 50 suspended from the ceiling. The locking structure 72 forms, for example, a groove having a bracket-like cross section extending in the Y-axis direction under the locking structure 72. This groove has a shape and size corresponding to the wiring duct 50 (that is, a standardized shape and size), and by locating the wiring duct 50 in the groove, the lighting device 10 can be moved. Locks to the wiring duct 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, when a speaker is installed on the floor surface or a wall surface close to the floor surface in an indoor space 60 such as an office, a desk or the like may become an obstacle and the sound may be scattered and the audible range may be narrowed. 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 indoor space 60, the boundary 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 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 (light guide plate 40) is adjusted so as to be included in the irradiation range R2 of the light emitted by the lighting device 10. FIG. 5 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 direct sound reachable range R1 and the light irradiation range R2 as shown in FIG. 5 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 arrangement of the plurality of vibrators 30. After the reach range R1 of the direct sound is determined, the reflection structure (specifically, the shape of the recess and the recess) provided in the light guide plate 40 so that the light irradiation range R2 becomes larger than the reach R1. Density, etc.) is adjusted (designed).

In this way, if the direct sound reach range R1 and the light irradiation range R2 are properly designed, a space of light and sound separated from the surroundings can be obtained.

[Functional configuration]
Next, the functional configuration of the lighting device 10 will be described. FIG. 6 is a block diagram showing a functional configuration of the lighting device 10.

As shown in FIG. 6, the lighting device 10 includes a first light source 21, a second light source 22, a first light emission control circuit 23, a second light emission control circuit 24, a control unit 25, a storage unit 26, a communication unit 27, and , The vibrator 30 is provided. In FIG. 6, in addition to the lighting device 10, the lighting controller 110 is also shown.

The specific configurations of the first light source 21, the second light source 22, and the vibrator 30 are as described above. In FIG. 6, only one first light source 21, second light source 22, and oscillator 30 are shown.

The first light emission control circuit 23 is a circuit that supplies voltage and current to the first light source 21 based on the control of the control unit 25. Specifically, the first light emission control circuit 23 is a dimming circuit such as a PWM (Pulse Width Modulation) control circuit.

The second light emission control circuit 24 is a circuit that supplies voltage and current to the second light source 22 based on the control of the control unit 25. Specifically, the second light emission control circuit 24 is a dimming circuit such as a PWM control circuit.

The control unit 25 controls the light emission of the first light source 21 via the first light emission control circuit 23, and controls the light emission of the second light source 22 via the second light source control circuit 24. That is, the control unit 25 can independently control the light emission of the first light source 21 and the second light source 22 (dimming control), whereby the lighting device 10 has a dimming function and a toning function. ing. Further, the control unit 25 acquires a sound signal from the storage unit 26 and controls the vibrator 30 based on the acquired sound signal. Such a control unit 25 is realized by, for example, a microcomputer, but may be realized by a processor.

The storage unit 26 is a storage device that stores a program executed by the control unit 25 and a sound source (sound signal) of sound emitted from the light guide plate 40. Specifically, the storage unit 26 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 and a sound effect).

The communication unit 27 is a communication circuit for the lighting device 10 to communicate with the lighting controller 110. The communication performed by the communication unit 27 may be wired communication or wireless communication. The communication standard for communication performed by the communication unit 27 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. 7 is a flowchart of the operation of the lighting device 10.

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

In this state, when the user performs an operation of instructing the lighting controller 110 to reproduce the sound, the communication unit 27 receives an instruction signal instructing the sound reproduction from the lighting controller 110 (S12). The control unit 25 reads a sound signal to be instructed from the storage unit 26 based on the received instruction signal, and vibrates the vibrator 30 based on the read sound signal to generate sound from the light guide plate 40. Generate (S13). That is, the sound signal (the sound indicated by the sound signal) is reproduced. Specifically, the sound signal is a sound signal of music content or the like.

The sound signal may be stored in the storage unit 26 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 26. It may be (buffered).

Further, at this time, the control unit 25 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 25 may link the light and sound emitted by the light guide plate 40 by controlling the light emission of the first light source 21 and the second light source 22 based on the sound signal.

For example, the control unit 25 detects the amplitude of the sound signal (that is, the strength 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 25 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 indoor space 60.

[Modification example]
In the above embodiment, the lighting device 10 is attached to the wiring duct 50 and is supplied with electric power from the wiring duct 50. However, the lighting device 10 is not limited to such an embodiment. FIG. 8 is an exploded perspective view of the lighting device according to the modified example.

The lighting device 10a shown in FIG. 8 is connected to the main body 11a having a configuration in which the locking structure 72 is omitted in the lighting device 10, the cover 12a covering the main body 11a from above, and the cover 12a via a cable 13a. The mounting structure 14a is provided. The lighting device 10a can operate by receiving electric power from the hook ceiling body by mounting the mounting structure 14a on the hook ceiling body provided on the ceiling. As described above, the present invention may be realized as a lighting device 10a which is attached to the hook sealing body and receives electric power from the hook sealing body.

Although the pendant type lighting device 10a is shown in FIG. 8, 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.

[Effects, etc.]
As described above, the lighting device 10 produces sound by vibrating the first light source 21, the light guide plate 40 that emits surface light when the light emitted by the first light source 21 is incident on the end portion, and the light guide plate 40. It is provided with an oscillator 30 for generating.

Such a lighting device 10 can function as a speaker by using the light guide plate 40 as a diaphragm.

Further, the vibrator 30 is arranged on the outer peripheral portion of the first main surface 41 of the light guide plate 40.

In such a lighting device 10, when the light guide plate 40 during light emission is viewed from the indoor space 60 side, the effect that the shadow of the vibrator 30 is inconspicuous can be obtained.

Further, the surface of the vibrator 30 facing the first main surface 41 is formed by a reflective member that reflects the light emitted by the light guide plate 40.

In such a lighting device 10, when the light guide plate 40 that is emitting light is viewed from the indoor space 60 side, it is possible to prevent the vibrator 30 from becoming a shadow.

Further, the reachable range R1 of the direct sound generated by the light guide plate 40 due to the vibration by the vibrator 30 is included in the light irradiation range R2 of the light guide plate 40.

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 25 that acquires a sound signal of a direct sound to be emitted from the light guide plate 40 and controls the vibrator 30 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 25 further controls the light emission of the first light source 21 based on the acquired sound signal, thereby interlocking the light and sound emitted by the light guide plate 40.

Such a lighting device 10 can improve the sense of presence in the indoor space 60.

Further, the lighting device 10 is installed on the ceiling side of the indoor space 60.

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 72 for locking the lighting device 10 to the wiring duct 50 suspended from the ceiling.

Such a lighting device 10 can be locked to the wiring duct 50.

Further, the lighting device 10 has a mounting structure 80 for receiving power supply from the wiring duct 50.

Such a lighting device 10 can receive electric power from the wiring duct 50.

Further, the lighting device 10 operates using the DC power supplied from the wiring duct 50.

Such a lighting device 10 can simplify and downsize the power conversion circuit included in the lighting device 10 as compared with the case where AC power is supplied from the wiring duct 50. Therefore, the lighting device 10 can be easily miniaturized and thinned.

(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 indoor space may be a space for other purposes.

Further, in the above embodiment, the lighting device is installed on the ceiling (or the ceiling side), but 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.

Further, 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.

Further, general or specific aspects of the present invention may be realized by 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 applying various modifications to each embodiment that can be conceived by those skilled in the art, or by arbitrarily combining the components and functions of each embodiment within the range not deviating from the gist of the present invention. Also included in the present invention.

10, 10a Lighting device 80 Mounting structure 21 First light source (light source)
25 Control unit 30 Oscillator 40 Light guide plate 41 First main surface (main surface)
50 Wiring duct 72 Locking structure

Claims

Light source and
A light guide plate that emits surface light when the light emitted by the light source is incident on the end
A lighting device including a vibrator that generates sound by vibrating the light guide plate.
The lighting device according to claim 1, wherein the vibrator is arranged on an outer peripheral portion of a main surface of the light guide plate.
The lighting device according to claim 2, wherein the surface of the vibrator facing the main surface is formed by a reflecting member that reflects light emitted by the light guide plate.
The lighting device according to any one of claims 1 to 3, wherein the range of direct sound generated by the light guide plate due to vibration by the vibrator is included in the light irradiation range of the light guide plate.
Moreover,
The lighting according to any one of claims 1 to 4, further comprising a control unit that acquires a sound signal of a direct sound to be emitted from the light guide plate and controls the vibrator based on the acquired sound signal. Device.
The lighting device according to claim 5, wherein the control unit further controls light emission of the light source based on the acquired sound signal to link the light and sound emitted by the light guide plate.
The lighting device according to any one of claims 1 to 6, wherein the lighting device is installed on the ceiling side of an indoor space.
The lighting device according to claim 7, further comprising a locking structure for locking the lighting device to a wiring duct suspended from the ceiling.
The lighting device according to claim 8, wherein the lighting device has a mounting structure for receiving power supply from the wiring duct.
The lighting device according to claim 9, wherein the lighting device operates using DC power supplied from the wiring duct.