JP7660282B2 - Lighting fixtures - Google Patents

Description

The present invention relates to lighting fixtures, and in particular to lighting fixtures with speaker functionality.

Ceiling lights are known as one type of lighting fixture that illuminates a room (see, for example, Patent Document 1). A ceiling light has a fixture body that is attached to the ceiling, a board fixed to the fixture body, and a light source consisting of multiple LEDs (Light Emitting Diodes) mounted on the board.

In addition, light guide type lighting fixtures that guide the light from a light source and irradiate it toward the room have also been proposed as ceiling lights. A known light guide type lighting fixture is a ceiling light that includes a light guide plate that guides the light from a first light source and a diffusion cover that diffuses the light from a second light source.

In recent years, lighting fixtures with speakers have been proposed. Specifically, light-guiding ceiling lights equipped with speakers have been proposed.

JP 2013-48167 A

However, conventional lighting fixtures with speakers have issues with weight and the overall size of the lighting fixture, because speakers of existing sizes are added to the basic structure of the lighting fixture. For example, if a speaker is housed inside a housing that houses a light source unit, the size of the housing must be increased, and the overall lighting fixture becomes larger. On the other hand, even if a speaker is attached externally to a housing that houses a light source unit, the overall lighting fixture becomes larger by the size of the speaker. Furthermore, attaching a speaker externally can worsen the design (designability) of the lighting fixture as a whole. Another issue is that if the weight or size of a lighting fixture increases, it becomes harder to install the lighting fixture.

The present invention was made in consideration of these problems, and aims to provide a lighting fixture that has speaker functionality while minimizing weight and size increases.

In order to achieve the above object, one aspect of the lighting device according to the present invention comprises a plurality of light sources, a substrate on which the plurality of light sources are mounted, a body to which the substrate is fixed, a light guide plate into which light emitted from the plurality of light sources enters, a fixing member that fixes the light guide plate and the body, and a vibrator that vibrates the components that constitute the lighting device.

The present invention makes it possible to realize a lighting fixture with speaker functionality while minimizing weight and size increases.

FIG. 1 is a perspective view of a lighting fixture according to an embodiment of the present invention as viewed from the floor surface side. FIG. 2 is a perspective view of the lighting fixture according to the embodiment as viewed from the ceiling side. FIG. 3 is a perspective view of the lighting fixture according to the first embodiment with the diffusion cover removed. FIG. 4 is an exploded perspective view of the lighting fixture according to the embodiment. FIG. 5 is a cross-sectional view showing a state in which the lighting fixture according to the embodiment is installed on a ceiling. FIG. 6 is an enlarged cross-sectional view of a lighting device according to an embodiment. FIG. 7 is a plan view of the lighting fixture according to the embodiment with the light source cover, the power supply cover, the diffusion cover, the decorative cover, and the support member removed. FIG. 8 is an enlarged cross-sectional view of a lighting fixture according to the first modification. FIG. 9 is a plan view of the lighting fixture according to the first modified example with the light source cover, the power supply cover, the diffusion cover, the decorative cover, and the support member removed. FIG. 10 is a plan view of the lighting fixture according to the second modified example with the light source cover, the power supply cover, the diffusion cover, the decorative cover, and the support member removed. FIG. 11 is an enlarged cross-sectional view of a lighting fixture according to the third modification. FIG. 12 is an enlarged cross-sectional view of a lighting fixture according to the fourth modification. FIG. 13 is an enlarged cross-sectional view of a lighting fixture according to the fifth modification.

The following describes the embodiments of the present invention. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, and the arrangement and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not described in the independent claims that show the highest concept of the present invention are described as optional components.

In addition, each figure is a schematic diagram and is not necessarily a precise illustration. In each figure, the same reference numerals are used for substantially the same configuration, and duplicate explanations are omitted or simplified. In this specification, the terms "upper" and "lower" do not necessarily refer to the upper direction (vertically upward) and the lower direction (vertically downward) in absolute spatial recognition.

(Embodiment)
A lighting fixture 1 according to an embodiment will be described with reference to Figs. 1 to 7. Fig. 1 is a perspective view of the lighting fixture 1 according to the embodiment when viewed from the floor surface side. Fig. 2 is a perspective view of the lighting fixture 1 when viewed from the ceiling side. Fig. 3 is a perspective view of the lighting fixture 1 with the diffusion cover 83 removed. Fig. 4 is an exploded perspective view of the lighting fixture 1. Fig. 5 is a cross-sectional view showing the lighting fixture 1 installed on the ceiling 2. Fig. 6 is an enlarged cross-sectional view of the lighting fixture 1 in Fig. 5. Figs. 5 and 6 show only the lines that appear in the cross section. Fig. 7 is a plan view of the lighting fixture 1 with the light source cover 81, the power supply cover 82, the diffusion cover 83, the decorative cover 84, and the support member 60 removed.

The lighting fixture 1 is installed, for example, in the construction materials of a building such as a house. As an example, the lighting fixture 1 is a ceiling light installed on the ceiling of a room in a building, and irradiates the room with illumination light. As shown in FIG. 5, the lighting fixture 1 is installed on the ceiling by attaching it to a hook ceiling 2a provided on the ceiling 2. Note that, for convenience, FIG. 5 shows the lighting fixture 1 with the ceiling 2 facing downward.

As shown in Figures 1 to 7, the lighting fixture 1 includes a main body 10, a substrate 20, a light source 30, a light guide plate 40, a vibrator 50, a support member 60, and mounting screws 71 and 72. The lighting fixture 1 further includes a light source cover 81, a power supply cover 82, a diffusion cover 83, and a decorative cover 84.

The lighting fixture 1 in this embodiment is a light guide type lighting fixture equipped with a light guide plate 40, and the light from the light source 30 is guided by the light guide plate 40 and irradiated as illumination light.

The main body 10 is the main body of the lighting fixture 1. As shown in FIG. 5, the main body 10 is a base that supports the substrate 20. The substrate 20 is fixed to the main body 10. The main body 10 also functions as a heat sink for dissipating heat generated by the light source 30 mounted on the substrate 20. Therefore, the main body 10 is preferably made of a metal material. In this embodiment, the main body 10 is made of sheet metal, and is formed into a predetermined shape by pressing a sheet metal such as a steel plate or an aluminum plate.

The main body 10 is composed of two parts, a first main body 10a and a second main body 10b. Both the first main body 10a and the second main body 10b are made of sheet metal. The first main body 10a and the second main body 10b are fixed to each other with screws or the like.

The first body 10a supports the substrate 20. Specifically, the substrate 20 is placed on a flat surface of the first body 10a and fixed to the first body 10a. The second body 10b constitutes an outer casing member of the lighting fixture 1. Therefore, the outer surface of the second body 10b is exposed to the outside air. The body 10 may be formed from a single sheet metal part.

As shown in Figs. 4 and 5, a substantially circular through hole is formed in the center of the main body 10. As shown in Fig. 5, a cylindrical insulating member 11 is fixed in this through hole. A holder 12 is attached to the insulating member 11. An adapter 13 is detachably attached to the holder 12. In other words, the holder 12 supports the adapter 13. The adapter 13 is a plug that is electrically and mechanically connected to a hook ceiling 2a provided on the ceiling 2. The adapter 13 is provided with a pair of L-shaped metal fittings that are engaged with a pair of holes provided in the hook ceiling 2a to make electrical contact.

In addition, multiple cushion members 14 made of urethane or the like are attached to the ceiling side surface of the main body 10. Specifically, as shown in FIG. 2, four cushion members 14 are provided on the ceiling side surface of the second main body 10b.

The substrate 20 arranged on the main body 10 is a light source substrate on which the light source 30 is arranged. The substrate 20 and the light source 30 constitute a light source module that serves as the light source section of the lighting fixture 1. In this embodiment, the light source 30 is composed of an LED, so the light source module is an LED module.

The substrate 20 is a mounting substrate for mounting the light source 30. The substrate 20 has a first surface (floor-side surface) on which the light source 30 is mounted, and a second surface (ceiling-side surface) facing away from the first surface. The substrate 20 is, for example, a printed wiring board on which metal wiring of a predetermined shape is formed. The substrate 20 may be divided into multiple pieces.

As shown in FIG. 4, in this embodiment, the substrate 20 is a ring-shaped mounting substrate having a through hole in the center. The through hole of the substrate 20 is connected to the through hole of the main body 10. A lead wire is drawn from the adapter 13 through the through hole of the substrate 20 and connected to a connector provided on the substrate 20.

The substrate 20 is, for example, a resin substrate made of an insulating resin material. Note that the substrate 20 is not limited to a resin substrate, and may be a metal-based substrate made of a metal material whose surface is coated with a resin, a ceramic substrate which is a sintered body of a ceramic material, or a glass substrate made of a glass material. In addition, the substrate 20 is a rigid substrate, but is not limited to this, and may be a flexible substrate.

Multiple light sources 30 are mounted on the substrate 20. Specifically, the multiple light sources 30 are mounted on a first surface of the substrate 20. The light sources 30 emit illumination light to brighten the space using the lighting device 1.

As shown in Figs. 4 and 5, in this embodiment, the light source 30 includes a first light source 31 and a second light source 32. A plurality of the first light sources 31 and a plurality of the second light sources 32 are mounted on the first surface of the substrate 20. As shown in Fig. 7, the plurality of first light sources 31 and the plurality of second light sources 32 are arranged in a line in an annular shape at intervals in the circumferential direction of the substrate 20. Note that one or both of the plurality of first light sources 31 and the plurality of second light sources 32 may be arranged in multiple lines.

As shown in Figures 5 to 7, the multiple first light sources 31 are arranged to face the light entrance section 41 of the light guide plate 40. Therefore, light emitted from the first light sources 31 enters the light guide plate 40 from the light entrance section 41. The light of the first light sources 31 that enters the light guide plate 40 is guided inside the light guide plate 40 and emitted to the outside of the lighting device 1. In this way, each of the multiple first light sources 31 is a light source for the light guide plate.

As shown in Figs. 4 and 7, the second light sources 32 are arranged inside the first light sources 31. As shown in Fig. 5, the first light sources 31 are covered with a light source cover 81. Therefore, the light emitted from the second light sources 32 enters the light source cover 81 without entering the light guide plate 40. In addition, the light source cover 81 is covered with a diffusion cover 83. Therefore, the light emitted from the second light source 32 passes through the light source cover 81 and the diffusion cover 83 and is emitted to the outside of the lighting device 1.

The first light source 31 and the second light source 32 are LED light sources composed of LEDs. In this embodiment, each of the first light source 31 and the second light source 32 is an individually packaged surface mount device (SMD) type light emitting element. As an example, each of the first light source 31 and the second light source 32 is an LED element having a white resin or ceramic package (container) having a recess, an LED chip (bare chip) primarily mounted on the bottom surface of the recess of the package, and a sealing member encapsulated in the recess of the package. The sealing member is composed of a translucent resin material such as silicone resin. The sealing member may be a phosphor-containing resin containing a wavelength conversion material such as a phosphor.

The LED chip is an example of a semiconductor light-emitting element that emits light using a specified DC power, and is a bare chip that emits monochromatic visible light. The LED chip is, for example, a blue LED chip that emits blue light when powered. In this case, in order to obtain white light, the sealing member contains a yellow phosphor such as YAG (yttrium aluminum garnet) that fluoresces using the blue light from the blue LED chip as excitation light.

In this way, each of the first light source 31 and the second light source 32 is a B-Y type white LED element composed of a blue LED chip and a yellow phosphor. Specifically, the yellow phosphor contained in the sealing member is excited by absorbing a portion of the blue light from the blue LED chip, and emits yellow light. This emitted yellow light mixes with the blue light not absorbed by the yellow phosphor to generate white light. In this way, white light is emitted from each of the first light source 31 and the second light source 32.

The first light source 31 and the second light source 32 may be configured to emit light of the same color, or may be configured to emit light of different colors. For example, the first light source 31 and the second light source 32 may be configured to emit white light of different color temperatures. In this case, as an example, the color temperature of the light of the first light source 31 is lower than the color temperature of the light of the second light source 32. In this case, the light of the first light source 31 can be incandescent white, and the light of the second light source 32 can be daylight white. In addition, the multiple first light sources 31 or the multiple second light sources 32 may be configured to emit light of different colors.

The first light source 31 and the second light source 32 may emit light simultaneously, or one of the first light source 31 and the second light source 32 may emit light. In this case, if the multiple light sources 30 include light sources that emit light of different colors, the lighting device 1 may not only have a function of dimming the illumination light, but also a function of adjusting the color of the illumination light.

The light source module in this embodiment is an integrated power supply type. Therefore, although not shown, not only is the light source 30 mounted on the board 20, but multiple circuit elements constituting a power supply circuit are also mounted on the board 20. In other words, the board 20 is both a light source board and a power supply circuit board. The multiple circuit elements mounted on the board 20 may be mounted on only one of the first surface and the second surface of the board 20, or may be mounted on both the first surface and the second surface of the board 20.

The multiple circuit elements mounted on the substrate 20 are circuit components that constitute a power supply circuit that generates power for making the light source 30 (first light source 31, second light source 32) emit light. The multiple circuit elements convert AC power supplied from a commercial power source via the hook ceiling 2a and the adapter 13 into DC power. The DC power generated by the power supply circuit is supplied to each of the multiple light sources 30 (first light source 31, second light source 32), causing each of the multiple light sources 30 to emit light. The multiple circuit elements are, for example, capacitive elements such as electrolytic capacitors or ceramic capacitors, resistive elements such as resistors, rectifier circuit elements, coil elements, choke coils (choke transformers), noise filters, semiconductor elements such as diodes or integrated circuit elements, etc. The circuit elements may include circuit components that constitute a dimming circuit or a boost circuit, etc., or may include circuit components (communication modules) that constitute a wireless communication circuit.

The board on which the circuit elements constituting the power supply circuit are mounted may be separate from the board 20 on which the light source 30 is mounted.

The light guide plate 40 is an optical member into which light emitted from the multiple light sources 30 enters. In this embodiment, light emitted from the multiple first light sources 31 enters the light guide plate 40. The light that enters the light guide plate 40 is guided inside the light guide plate 40 and emitted to the outside of the lighting device 1. In other words, the light guide plate 40 is a light guide member for guiding the light emitted from the multiple first light sources 31 to the outside of the lighting device 1.

The light guide plate 40 is made of a translucent resin material, for example, an acrylic resin such as PMMA (polymethyl methacrylate) resin or a polycarbonate resin. The light guide plate 40 is preferably made of a transparent resin material with a high transmittance that allows the other side to be seen through. In this embodiment, the light guide plate 40 is made of a transparent plate made of acrylic resin. The light guide plate 40 is not limited to a transparent resin plate made of a resin material, and may be a glass plate made of transparent glass.

As shown in Figs. 4 and 7, the light guide plate 40 is annular and has an opening 40a in the center. In this embodiment, the outer shape of the light guide plate 40 is circular. Therefore, the light guide plate 40 is approximately annular. The multiple second light sources 32 and the light source cover 81 are disposed in positions facing the opening 40a of the light guide plate 40.

As shown in Figures 5 to 7, the light guide plate 40 has a light entrance section 41, a curved section 42, and a light exit section 43 as light guide regions.

The light entrance portion 41 is formed in a ring shape around the entire circumference of one end of the curved portion 42, and defines the inner circumference of the light guide plate 40. The light entrance portion 41 is disposed in a position facing and close to the multiple first light sources 31. In other words, the multiple first light sources 31 are disposed in a position facing the inner circumference of the light guide plate 40. As a result, light emitted from the first light sources 31 enters the light entrance portion 41.

The curved portion 42 expands in a trumpet shape from one end (the end on the ceiling side) to the other end (the end on the floor side). In this embodiment, the curved portion 42 is a curved plate with a constant thickness. The curved portion 42 guides the light incident on the light entrance portion 41 from one end to the other end. Specifically, the curved portion 42 guides the light of the first light source 31 incident from the light entrance portion 41 to the light exit portion 43. The curved portion 42 is supported by the decorative cover 84 and the support member 60. Specifically, the curved portion 42 is sandwiched between the decorative cover 84 and the support member 60.

The light exit portion 43 extends from the entire circumference of the other end of the curved portion 42 radially outward of the light guide plate 40. In this embodiment, the light exit portion 43 has a constant thickness and is a flat plate. Specifically, the light exit portion 43 is a circular flat plate formed to be approximately parallel to the ceiling surface. In a plan view, the light exit portion 43 extends so as to protrude radially outward from the diffusion cover 83 of the light guide plate 40. Specifically, the light exit portion 43 is formed so as to protrude horizontally from the support member 60 and the decorative cover 84. In other words, the light exit portion 43 is a portion of the light guide plate 40 that is exposed to the outside. Therefore, when a user looks up at the lighting device 1, the user can see the light exit portion 43.

The light of the first light source 31 that enters the light entrance portion 41 and is guided from the curved portion 42 to the light exit portion 43 is emitted to the outside as surface emission from at least one of the surfaces on one side (floor side) and the other side (ceiling side) of the light exit portion 43. In this embodiment, the light of the first light source 31 that enters the light exit portion 43 is mainly emitted to the outside from the surface on one side (floor side) of the light exit portion 43. In other words, the surface on one side (floor side) of the light exit portion 43 is the light exit surface. In this case, it is preferable that a plurality of dot-shaped prisms (e.g., recesses such as triangular pyramids or cones) are formed on the surface on the other side (ceiling side) of the light exit portion 43. This allows the light of the first light source 31 that enters the light exit portion 43 to be totally reflected by the prisms and travel toward the surface on one side (floor side) and emitted from the surface on the one side.

As shown in Figs. 4 and 7, the light guide plate 40 has a protrusion 44 formed to protrude into the opening 40a. Specifically, the protrusion 44 is formed to protrude from the light entrance portion 41 toward the radial inside of the light guide plate 40.

In this embodiment, the light guide plate 40 has a plurality of protrusions 44. One of the plurality of protrusions 44 is a transducer installation portion 44a on which the transducer 50 is installed. Specifically, one of the three protrusions 44 is the transducer installation portion 44a. The protrusion 44 that is the transducer installation portion 44a has a larger protrusion amount than the other two protrusions 44. In other words, when viewed in a plan view, the protrusion 44 that is the transducer installation portion 44a has a larger area than the other two protrusions 44. This allows space to be secured in the transducer installation portion 44a to install the transducer 50 at a position closer to the center of the device than the mounting screw 71 that corresponds to the fixed portion of the light guide plate 40.

Each of the multiple protrusions 44 has a through hole 45 into which a mounting screw 71 is inserted. The light guide plate 40 is attached to the main body 10 by inserting the mounting screw 71 into the through hole 45. The through hole 45 formed in the protrusion 44, which is the transducer installation portion 44a, is circular and surrounded by a periphery, and the through holes 45 formed in the other two protrusions 44 are notched, but this is not limited to this.

The vibrator 50 vibrates the components that make up the lighting device 1. In this embodiment, the vibrator 50 is installed on the light guide plate 40, so the component that vibrates due to the vibrator 50 among the components that make up the lighting device 1 is the light guide plate 40.

The vibrator 50 is composed of a coil, a magnet, etc., and converts an electrical signal into a vibration mechanical signal. In this embodiment, the vibrator 50 is installed on the light guide plate 40, so the vibrator 50 vibrates the light guide plate 40. When the light guide plate 40 vibrates, the air vibrates, and sound can be transmitted to the user. In this way, the vibrator 50 and the light guide plate 40 can convert an electrical signal input to the vibrator 50 into sound. For example, by vibrating the light guide plate 40 with the vibrator 50, the lighting device 1 can output sound such as music or voice (message).

The vibrator 50 is installed on the protruding portion 44 of the light guide plate 40. Specifically, it is installed on the protruding portion 44, which is the vibrator installation portion 44a. In this embodiment, the vibrator 50 is attached to the surface of the vibrator installation portion 44a facing the floor.

As shown in Figures 6 and 7, the protrusion 44 of the light guide plate 40 is located closer to the center of the device than the light source 30. Therefore, the vibrator 50 installed on the protrusion 44 is installed closer to the center of the device than the light source 30. The vibrator 50 is also installed closer to the center of the device than the through hole 45 formed in the protrusion 44. Therefore, the vibrator 50 is installed closer to the center of the device than the mounting screw 71 inserted into the through hole 45.

The vibrator 50 is small and lightweight. The external dimensions of the vibrator 50 are, for example, within 50 mm in length, width, and height, but are not limited to this.

The vibrator 50 may also have a wireless communication function such as Bluetooth (registered trademark) or wireless LAN. As a result, when a user wants to play music through the lighting device 1, the user can play music from the lighting device 1 by sending sound information (sound source) to the vibrator 50 using an information terminal such as a smartphone. In other words, the vibrator 50 receives sound information sent from the user's information terminal and vibrates in response to an electrical signal corresponding to this sound information.

The support member 60 is a member that supports the light guide plate 40. As shown in FIG. 6, the support member 60 is located on the floor side of the light guide plate 40. The support member 60 also functions as a reflective member for reflecting the light guided inside the curved portion 42 of the light guide plate 40. The support member 60 is made of, for example, a white resin. This allows the light that reaches the support member 60 to be reflected. The resin material that makes up the support member 60 can be, for example, polycarbonate or PBT (polybutylene terephthalate).

The support member 60 is formed in a ring shape as a whole. Specifically, the support member 60 has a ring-shaped reflecting portion 61 and a protruding portion 62 formed on the reflecting portion 61.

The reflecting portion 61 has a reflective surface on its surface, and reflects the light that reaches the reflecting portion 61. The reflecting portion 61 expands in a trumpet shape from one end (the end on the ceiling side) to the other end (the end on the floor side). The reflecting portion 61 covers the curved portion 42 of the light guide plate 40.

As shown in FIG. 4, the protrusion 62 is formed to protrude into the opening of the support member 60. Specifically, the protrusion 62 is formed to protrude toward the radial inside of the support member 60. In this embodiment, a plurality of protrusions 62 are formed. The plurality of protrusions 62 are formed to correspond to the plurality of protrusions 44 of the light guide plate 40. Specifically, three protrusions 62 are formed on the support member 60, and the three protrusions 62 are positioned to overlap the three protrusions 44 of the light guide plate 40 when viewed in a plan view.

Each of the multiple protrusions 62 has a through hole into which a mounting screw 71 is inserted. The through hole formed in each protrusion 62 is notched, but is not limited to this. The mounting screw 71 is inserted into the through hole formed in the protrusion 62, thereby attaching the support member 60 to the main body 10. The through hole formed in the protrusion 62 of the support member 60 communicates with the through hole 45 formed in the protrusion 44 of the light guide plate 40. Therefore, the mounting screw 71 is inserted through the through hole formed in the protrusion 62 of the support member 60 and the through hole 45 formed in the protrusion 44 of the light guide plate 40.

The mounting screw 71 is a fixing member that fixes the light guide plate 40 and the main body 10. Specifically, the mounting screw 71 fixes the light guide plate 40 to the main body 10. In this embodiment, the mounting screw 71 fixes not only the light guide plate 40 but also the support member 60 and the light source cover 81 to the main body 10. Specifically, as shown in FIG. 6, the mounting screw 71 is inserted through a through hole formed in the light source cover 81, a through hole formed in the protruding portion 62 of the support member 60, a through hole 45 formed in the protruding portion 44 of the light guide plate 40, and a through hole formed in the substrate 20, and is screwed into a screw hole of the first main body 10a. In other words, the light source cover 81, the support member 60, the light guide plate 40, and the substrate 20 are fastened together by the mounting screw 71. The mounting screw 71 is, for example, a shoulder screw, but is not limited thereto, and other types of screws may be used.

As shown in FIG. 6, the mounting screw 71 is located closer to the center of the fixture than the light source 30. In other words, the light source 30 is located farther from the mounting screw 71 relative to the center of the fixture. Specifically, the mounting screw 71 is located closer to the center of the fixture than the first light source 31, and the first light source 31 is located farther from the mounting screw 71 relative to the center of the fixture.

The power supply cover 82 is fixed to the main body 10 by a mounting screw 72. In this embodiment, the mounting screw 72 fixes not only the power supply cover 82 but also the light source cover 81 to the main body 10. Specifically, the mounting screw 72 is inserted through a through hole formed in the power supply cover 82 and a through hole formed in the light source cover 81, and is screwed into a screw hole in the first main body 10a.

The light source cover 81 is a translucent cover that covers the second light source 32. Therefore, the light emitted from the second light source 32 enters the light source cover 81 and passes through the light source cover 81. The light source cover 81 is formed in an annular shape so as to cover the multiple second light sources 32 arranged in an annular shape. Note that the light source cover 81 covers only the second light source 32 of the first light source 31 and the second light source 32, and does not cover the first light source 31.

The light source cover 81 may have a light distribution control function that controls the light distribution of the light emitted from the second light sources 32. For example, the light source cover 81 may have a lens function that expands the light distribution angle of the light emitted from the multiple second light sources 32.

The light source cover 81 is attached to the main body 10 by mounting screws 71 and 72. The light source cover 81 has a through hole through which the mounting screw 71 is inserted and a through hole through which the mounting screw 72 is inserted.

The light source cover 81 is located inside the light guide plate 40. Specifically, the light source cover 81 is arranged in the opening 40a of the light guide plate 40 so as to cover the protruding portion 44 of the light guide plate 40. At this time, the light source cover 81 is arranged so that the through hole of the light source cover 81 corresponding to the mounting screw 71 communicates with the through hole 45 formed in the protruding portion 44 of the light guide plate 40.

The light source cover 81 is made of a resin material having translucency. For example, the light source cover 81 is made of acrylic, polycarbonate, polyethylene terephthalate, polyvinyl chloride, etc. The material of the light source cover 81 is not limited to a resin material, and may be glass, etc.

In this embodiment, the light source cover 81 is transparent and does not have light diffusion properties, but the light source cover 81 may have light diffusion properties. By giving the light source cover 81 light diffusion properties, the light from the second light source 32 can be diffused (scattered). In this case, the light source cover 81 is, for example, milky white, and can be made of a resin material in which light diffusion particles are dispersed.

The power supply cover 82 is a cover member that covers the multiple circuit elements mounted on the substrate 20. Specifically, the power supply cover 82 covers the circuit elements mounted on the first surface (floor side surface) of the substrate 20 among the multiple circuit elements.

The power supply cover 82 is disposed inside the light source cover 81. The power supply cover 82 is in the shape of a ring that surrounds the opening of the main body 10. The power supply cover 82 is attached to the main body 10 with mounting screws 72. The power supply cover 82 has a through hole through which the mounting screw 72 is inserted. The power supply cover 82 is disposed so that the through hole of the light source cover 81 that corresponds to the mounting screw 72 communicates with the through hole of the power supply cover 82.

The power supply cover 82 is a metal cover made of metal, but is not limited to this. For example, the power supply cover 82 may be a resin cover made of resin. In addition, the power supply cover 82 may have reflectivity to reflect the light of the second light source 32 that has passed through the light source cover 81.

The diffusion cover 83 is a cover member that is translucent and diffusive. The diffusion cover 83 is disk-shaped and covers the main body 10, the light source cover 81, the power supply cover 82, and the support member 60. The diffusion cover 83 is arranged so as to cover the opening 40a of the light guide plate 40. Specifically, the diffusion cover 83 is arranged so as to cover the opening 40a of the light guide plate 40. As shown in FIG. 5, in this embodiment, the diffusion cover 83 is an outer cover that forms the outer shell of the lighting device 1.

The diffusion cover 83 is attached to the support member 60 in a removable manner. The diffusion cover 83 can be attached to or removed from the support member 60 by rotating it.

The diffusion cover 83 transmits the light emitted by the second light source 32. Specifically, the diffusion cover 83 diffuses (scatters) the light that is emitted from the second light source 32 and transmitted through the light source cover 81 and transmits it. This allows the entire diffusion cover 83 to irradiate uniform illumination light with high brightness uniformity to the outside.

The diffusion cover 83 can be formed using a resin material having translucency. The diffusion cover 83 is made of, for example, acrylic, polycarbonate, polyethylene terephthalate, polyvinyl chloride, or the like. The diffusion cover 83 is milky white, and can be made of, for example, a resin material in which light diffusing particles are dispersed.

The decorative cover 84 is a cover member that covers the main body 10 from the side. The decorative cover 84 is formed in a ring shape. Specifically, the decorative cover 84 spreads out in a trumpet shape from one end (the end on the floor side) to the other end (the end on the ceiling side). The decorative cover 84 is formed, for example, from white polystyrene resin.

A part of the decorative cover 84 is formed along the curved portion 42 of the light guide plate 40 and covers the curved portion 42 from the ceiling side. The curved portion 42 of the light guide plate 40 is located between a part of the decorative cover 84 and the reflecting portion 61 of the support member 60.

In the lighting fixture 1 configured in this manner, the light source 30 (first light source 31, second light source 32) emits light when DC power is supplied from the power supply circuit to the light source 30.

In this case, the light emitted from each of the multiple first light sources 31 enters the light entrance section 41 of the light guide plate 40 and is then guided inside the curved section 42. Inside the curved section 42, the light from the multiple first light sources 31 is guided to the light exit section 43 while being reflected by the reflecting section 61 of the support member 60. The light guided to the light exit section 43 is emitted to the outside as illumination light from the surface of the light exit section 43. Note that the light emitted from the first light source 31 is irradiated to the outside of the lighting fixture 1 without passing through the light source cover 81 and the diffusion cover 83.

On the other hand, the light emitted from each of the second light sources 32 passes through the light source cover 81 and then enters the diffusion cover 83. The light from the second light source 32 that enters the diffusion cover 83 passes through the diffusion cover 83 while being diffused by the diffusion cover 83. In this way, the light emitted from the second light source 32 is irradiated to the outside of the lighting device 1 without entering the light guide plate 40.

As described above, the lighting fixture 1 according to this embodiment includes a plurality of light sources 30, a substrate 20 on which the plurality of light sources 30 are mounted, a main body 10 to which the substrate 20 is fixed, a light guide plate 40 into which light emitted from the plurality of light sources 30 enters, a mounting screw 71 (fixing member) that fixes the light guide plate 40 to the main body 10, and a vibrator 50 that vibrates the members that make up the lighting fixture 1.

With this configuration, the vibrator 50 can vibrate the components that make up the lighting fixture 1 to output sound from the lighting fixture 1. This makes it possible to realize a lighting fixture 1 that has speaker functionality while minimizing weight and size increases.

In addition, in the lighting fixture 1 according to this embodiment, the vibrator 50 is not exposed to the outside. In other words, the vibrator 50 is not visible to the user when the user looks up at the lighting fixture 1 from below. Specifically, the vibrator 50 is disposed at a position overlapping the diffusion cover 83 in a plan view. This makes it possible to realize a lighting fixture 1 with a speaker function that is small, lightweight, and has an excellent design, even if the vibrator 50 is added to any position of the components that make up the lighting fixture 1.

In addition, in the lighting device 1 according to this embodiment, the vibrator 50 is installed on the light guide plate 40. In other words, the member vibrated by the vibrator 50 in the lighting device 1 is the light guide plate 40.

In this embodiment, the light guide plate 40 is plate-shaped, so that the light guide plate 40 can be effectively vibrated by vibrating the vibrator 50 installed on the light guide plate 40. This allows sound to be output from the light guide plate 40.

In particular, since the light guide plate 40 has a light output section 43 exposed to the outside, sound can be effectively output from the light output section 43 to the outside of the lighting fixture 1 (into the air) by vibrating the light guide plate 40 with the vibrator 50. In other words, the light output section 43 has the function of outputting light and the function of outputting sound.

However, since the light guide plate 40 guides light and irradiates illumination light to the outside, vibrating the light guide plate 40 with the vibrator 50 can output sound from the light guide plate 40, but this may cause fluctuations in the illumination light of the lighting device 1. For example, vibrating the light guide plate 40 may cause the illumination light of the lighting device 1 to flicker.

Here, in the light guide plate 40, the portion outside the fixed portion (mounting screw 71) between the light guide plate 40 and the main body 10 is less affected by the vibration caused by the vibrator 50. Therefore, in the lighting fixture 1 according to this embodiment, the vibrator 50 is installed closer to the center of the fixture than the mounting screw 71. This makes it possible to suppress fluctuations in the illumination light of the lighting fixture 1 even if the vibrator 50 is installed on the light guide plate 40.

In this case, in this embodiment, the vibrator 50 is installed using the protrusion 44 in which the through hole 45 through which the mounting screw 71 is inserted is formed. Moreover, one of the multiple protrusions 44 is extended radially inward more than the other protrusions 44 to be longer and serve as the vibrator installation section 44a. In other words, the vibrator installation section 44a, which is a flat section with a large area, is formed in a portion inside the mounting screw 71 that fixes the light guide plate 40 and the main body 10, and the vibrator 50 is installed on the vibrator installation section 44a. This allows the vibrator 50 to effectively vibrate the protrusion 44 (vibrator installation section 44a), which is a flat section with a large area, and output sound from the light output section 43. Therefore, it is possible to improve the volume and quality of the sound output from the light guide plate 40 while suppressing the occurrence of fluctuations in the illumination light of the lighting device 1.

In addition, in this embodiment, the light incident on the light guide plate 40 from the first light source 31 travels outward from the first light source 31. Therefore, by installing the vibrator 50 closer to the center of the device than the first light source 31, it is possible to effectively suppress fluctuations in the illumination light from the lighting device 1.

Furthermore, as in this embodiment, by locating the first light source 31 that emits light that enters the light guide plate 40 closer to the center of the fixture than the mounting screw 71, it is possible to further suppress the occurrence of fluctuations in the illumination light of the lighting fixture 1. In other words, it is preferable that the first light source 31 is located farther away from the center of the fixture than the mounting screw 71.

Also, as in the lighting fixture 1A shown in Figures 8 and 9, it is preferable that a slit 46 is provided in the periphery of the transducer 50 in the light guide plate 40. Specifically, the slit 46 is provided in the protruding portion 44, which is the transducer installation portion 44a.

As a result, the slits 46 can block the propagation of vibrations of the light guide plate 40 (protrusions 44) caused by the vibrator 50. Therefore, even if the light guide plate 40 vibrates due to the vibrations of the vibrator 50, the vibrations of the light guide plate 40 can be reduced, and fluctuations in the illumination light of the lighting device 1A can be suppressed.

In this case, the slit 46 is preferably located between the vibrator 50 and the mounting screw 71 (fixing member). This makes it possible to prevent the vibration of the light guide plate 40 from propagating outside the mounting screw 71 even if the vibrator 50 vibrates and causes the light guide plate 40 to vibrate. This not only makes it possible to prevent fluctuations in the illumination light of the lighting device 1A, but also makes it possible to prevent the mounting screw 71 from becoming loose due to vibration and coming off.

The slits 46 provided in the light guide plate 40 are not limited to being linear, but may be arc-shaped, etc. The number of slits 46 is not limited to being one, but may be multiple. In this case, the vibrator 50 may be surrounded by multiple slits 46.

(Modification)
Although the present invention has been described based on the embodiment, the present invention is not limited to the above embodiment.

For example, in the above embodiment, the vibrator 50 is installed on the protruding portion 44 in which the through hole 45 is formed, but this is not limited to the above. Specifically, as in the lighting fixture 1B shown in FIG. 10, a protruding portion 44B may be provided separately from the protruding portion 44 in which the through hole 45 is formed, and the protruding portion 44B may be used as the vibrator installation portion 44a, and the vibrator 50 may be installed on the protruding portion 44B. Note that, like the protruding portion 44, the protruding portion 44B is formed to protrude toward the opening 40a, but does not have a through hole 45. Also, the protruding portion 44B (vibrator installation portion 44a) in which the vibrator 50 is installed has a larger protruding amount than the other protruding portions 44.

In addition, in the above embodiment, the vibrator 50 is installed on the light guide plate 40, but this is not limited to this.

For example, as in the lighting device 1C shown in FIG. 11, the vibrator 50 may be installed on the support member 60C. Specifically, in the lighting device 1C, a protrusion 63 is provided on the support member 60C as a vibrator installation portion, and the vibrator 50 is installed on this protrusion 63. The protrusion 63 is formed in a flat plate shape so as to protrude radially inward so as to overhang the opening of the support member 60C. In this modification, since the vibrator 50 is installed on the support member 60C, the member vibrated by the vibrator 50 among the members constituting the lighting device 1C is the support member 60C. In addition, in this modification, since the support member 60C and the light guide plate 40C are in contact with each other, the light guide plate 40C also vibrates when the support member 60C vibrates due to the vibrator 50. In other words, the members vibrated by the vibrator 50 are both the support member 60C and the light guide plate 40C. In addition, in this modification, the light guide plate 40C does not have a protrusion 44 that serves as the vibrator installation portion 44a formed thereon.

In this way, by installing the vibrator 50 on the support member 60C, the vibrator 50 can vibrate the support member 60C to output sound from the lighting device 1C. This makes it possible to realize a lighting device 1C with a speaker function while suppressing weight and size increases. Moreover, in this modified example, the vibrator 50 is not installed on the light guide plate 40C, so that it is possible to prevent the illumination light of the lighting device 1C from flickering due to the vibration of the light guide plate 40C. Furthermore, in this modified example, not only the support member 60C but also the light guide plate 40C is vibrated by the vibrator 50, so that sound is output from both the support member 60C and the light guide plate 40C. This makes it possible to improve the volume and quality of the sound output from the lighting device 1C. Note that the support member 60C has a higher strength than the light guide plate 40C in terms of shape, material, arrangement structure, etc., so that the vibrator 50 can be stably supported by installing the vibrator 50 on the support member 60C.

Also, as in the lighting fixture 1D shown in FIG. 12, a vibrator mounting member 90 may be further disposed on the ceiling side of the light guide plate 40D, and the vibrator 50 may be mounted on the vibrator mounting member 90. The vibrator mounting member 90 has a flat plate portion 91 exposed to the outside and a vibrator mounting portion 92 on which the vibrator 50 is mounted. The vibrator mounting portion 92 faces the curved portion 42 of the light guide plate 40D and is located between the curved portion 42 and the decorative cover 84. The vibrator mounting member 90 may be transparent or opaque. In this modification, since the vibrator 50 is mounted on the vibrator mounting member 90, the member vibrated by the vibrator 50 among the members constituting the lighting fixture 1D is the vibrator mounting member 90. Note that in this modification, the light guide plate 40D does not have a protrusion 44 that becomes the vibrator mounting portion 44a formed thereon. In addition, the light guide plate 40D and the transducer mounting member 90 are arranged separately, and the light guide plate 40D and the transducer mounting member 90 are not in contact with each other.

In this way, by installing the vibrator 50 on the vibrator mounting member 90, it is possible to realize a lighting device 1D having a speaker function while suppressing an increase in weight and size. Moreover, since the vibrator 50 is not installed on the light guide plate 40D in this modified example, it is possible to prevent the light guide plate 40D from vibrating and flickering the illumination light of the lighting device 1D. Furthermore, in this modified example, the material and shape of the vibrator mounting member 90 can be made such that the vibrator mounting member 90 is easily vibrated by the vibration of the vibrator 50, so that the volume and sound quality of the sound output from the lighting device 1D can be easily improved. Furthermore, since the vibrator mounting member 90 has a flat plate portion 91 exposed to the outside, it is possible to effectively improve the volume and sound quality of the sound output from the vibrator mounting member 90 by the vibration of the vibrator 50. In addition, in this modified example, the vibrator mounting portion 92 on which the vibrator 50 is installed is hidden inside the lighting device 1D and cannot be seen by the user, so it is also possible to suppress the deterioration of the design due to the installation of the vibrator 50. Also, as in this modified example, by mounting the vibrator 50 on the vibrator mounting member 90 that is arranged separately from the light guide plate 40D, light is output from the light guide plate 40D but sound is not output, and sound is output from the vibrator mounting member 90 but light is not output. In other words, in the lighting device 1D of this modified example, the component that has the function of outputting light and the component that has the function of outputting sound are separated.

In addition, in the above embodiment, the mounting screw 71 is located outside the vibrator 50, but this is not limited to the above. For example, as in the lighting fixture 1E shown in FIG. 13, the mounting screw 71 may be located inside the vibrator 50. In the lighting fixture 1E, the first light source 31 that emits light that enters the light guide plate 40E may also be located outside the vibrator 50. Note that FIG. 13 shows only the light guide plate 40E, the substrate 20, the light source 30, and the mounting screw 71, and the other components are omitted.

In the above embodiment, the slits 46 formed in the light guide plate 40 are located inside the first light source 31, but this is not limited thereto. Specifically, the slits 46 formed in the light guide plate 40 may be located outside the first light source 31. In this case, for example, the slits 46 may be formed in the light emitting portion 43. In addition, when the slits 46 are formed outside the first light source 31, it is preferable that the slits 46 do not exist on an extension line of a line connecting the center of the lighting fixture and the center of the first light source 31 when the light guide plate 40 is viewed from above. This makes it possible to suppress the light of the first light source 31 from being blocked by the slits 46 when it is guided radially outward inside the light guide plate 40.

In the above embodiment, only one vibrator 50 is installed on the light guide plate 40, but this is not limited to the above. Specifically, a plurality of vibrators 50 may be installed on the light guide plate 40. For example, a vibrator 50 may be installed on each of the plurality of protrusions 44 on the light guide plate 40. In this way, by installing a plurality of vibrators 50 on the light guide plate 40, the sound quality and volume of the sound output from the light guide plate 40 can be improved. In addition, when a plurality of vibrators 50 are used, it is preferable that the plurality of vibrators 50 includes a vibrator 50 for high tones and a vibrator 50 for low tones. This can further improve the sound quality of the sound output from the light guide plate 40. Note that instead of installing a plurality of vibrators 50 on the light guide plate 40, a vibrator 50 may be installed on each of different members. For example, a vibrator 50 may be installed on each of the light guide plate 40 and the support member 60. In other words, the lighting device may be one that includes the light guide plate 40 of the lighting device 1 shown in Figures 1 to 7 and the support member 60C of the lighting device 1C shown in Figure 11.

In addition, in the above embodiment, screws are exemplified as the fixing member for fixing the light guide plate 40 and the main body 10, but this is not limited thereto. Specifically, the fixing member for fixing the light guide plate 40 and the main body 10 may be a fastening member other than a screw, such as a bolt or a nut, or may be a locking structure formed on one or both of the light guide plate 40 and the main body 10.

In the above embodiment, the light emitting module consisting of the light source 30 and the substrate 20 is an SMD type LED module using an SMD type LED element as the light source 30, but is not limited to this. For example, the light emitting module may be a COB (chip on board) type LED module using an LED chip as the light source 30. In this case, the light emitting module is composed of the substrate 20, one or more LED chips (bare chips) directly mounted on the substrate 20, and a sealing member such as a phosphor-containing resin that seals the LED chip.

In the above embodiment, the light source 30 is configured by an LED, but this is not limited to this. For example, the light source 30 may be configured by a semiconductor light-emitting element such as a semiconductor laser, an organic EL (Electro Luminescence) or an inorganic EL, or other solid-state light-emitting element.

In the above embodiment, the lighting fixture 1 is a ceiling light, but this is not limited to this. The present invention may be applied to lighting fixtures other than ceiling lights as long as the lighting fixture is a light guide type that has a light guide plate.

In addition, the present invention also includes forms obtained by applying various modifications to the above-mentioned embodiments that a person skilled in the art may conceive, and forms realized by arbitrarily combining the components and functions of each embodiment within the scope of the spirit of the present invention.

REFERENCE SIGNS LIST 1, 1A, 1B, 1C, 1D, 1E Lighting fixture 10 Body 20 Substrate 30 Light source 40, 40C, 40D, 40E Light guide plate 50 Transducer 60, 60C Support member 71, 72 Mounting screw (fixing member)
90 Transducer mounting member

Claims (10)

A lighting fixture, comprising:
A plurality of light sources;
a substrate on which the plurality of light sources are mounted;
a main body to which the substrate is fixed;
a light guide plate into which light emitted from the plurality of light sources enters;
a fixing member that fixes the light guide plate and the main body;
and a vibrator that vibrates a member that constitutes the lighting fixture ,
The member vibrated by the vibrator has an exposed portion whose front and back surfaces are exposed to the outside.
Lighting fixtures. The vibrator is disposed on the light guide plate,
The member vibrated by the vibrator is the light guide plate.
2. A lighting fixture according to claim 1. The transducer is disposed closer to the center of the device than the light source.
3. A lighting device according to claim 2. The transducer is installed closer to the center of the instrument than the fixed member.
4. A lighting device according to claim 2 or 3. The light source is located farther from the center of the device than the fixing member.
A lighting fixture according to any one of claims 2 to 4. A lighting fixture, comprising:
A plurality of light sources;
a substrate on which the plurality of light sources are mounted;
a main body to which the substrate is fixed;
a light guide plate into which light emitted from the plurality of light sources enters;
a fixing member that fixes the light guide plate and the main body;
and a vibrator that vibrates a member that constitutes the lighting fixture,
A slit is provided in the light guide plate at a periphery of the transducer.
Lighting fixtures. The slit is located between the vibrator and the fixed member.
7. A lighting device according to claim 6. When the light guide plate is viewed from above, the slit does not exist on an extension line of a line connecting the center of the device and the center of the light source.
8. A lighting device according to claim 6 or 7. a support member for supporting the light guide plate,
The vibrator is mounted on the support member,
The member vibrated by the vibrator is the support member.
2. A lighting fixture according to claim 1. A lighting fixture, comprising:
A plurality of light sources;
a substrate on which the plurality of light sources are mounted;
a main body to which the substrate is fixed;
a light guide plate into which light emitted from the plurality of light sources enters;
a fixing member that fixes the light guide plate and the main body;
An oscillator that vibrates a member that constitutes the lighting fixture;
a transducer mounting member located on a ceiling side relative to the light guide plate ,
the transducer is mounted on the transducer mounting member,
The member vibrated by the vibrator is the vibrator mounting member.
Lighting fixtures.

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