JP7373740B2 - lighting equipment - Google Patents

Description

The present invention relates to a lighting fixture for illuminating a space such as a room.

A ceiling light is known as one type of lighting equipment for illuminating a room (see, for example, Patent Document 1). A ceiling light includes a fixture body that is attached to the ceiling of a room, a board supported by the fixture body, a first light emitting element and a second light emitting element mounted on the board, and light from the first light emitting element. It includes a light guide plate that guides the light into the room and a diffusion cover that diffuses the light from the second light emitting element. The diffusion cover has a circular shape in plan view. The light guide plate has an annular shape in plan view and is arranged to surround the diffusion cover.

Japanese Patent Application Publication No. 2017-208279

In recent years, in order to make lighting equipment thinner, it has been considered to arrange the diffusion cover flush with the light guide plate. In this case, the diffusion cover will be placed closer to the second light emitting element. In the diffusion cover, the brightness increases near the second light emitting element, and the brightness decreases as the distance from the second light emitting element increases. In other words, uneven brightness occurs within the diffusion cover, resulting in a so-called poor appearance.

An object of the present invention is to provide a lighting fixture that can stably improve the uniformity of illumination light while achieving a thin design.

In order to solve the above problems, a lighting device according to one aspect of the present invention is a lighting device for illuminating a space, which includes a device main body, a substrate supported by the device main body, and a light emitting device provided on the substrate. a first light guide plate that covers the light emitting part and guides light from the light emitting part toward the space; and a light attenuator disposed at a position facing the light emitting part via the first light guide plate. , and the light attenuator has a positioning portion positioned with respect to the substrate.

According to the lighting fixture according to one aspect of the present invention, the uniformity of illumination light can be stably increased while achieving a reduction in thickness.

FIG. 2 is a perspective view showing the appearance of the lighting fixture on the floor surface side according to the embodiment. FIG. 2 is a perspective view showing the appearance of the lighting fixture on the ceiling side according to the embodiment. 1 is an exploded perspective view showing a lighting fixture according to an embodiment; FIG. FIG. 2 is a cross-sectional view of the lighting fixture according to the embodiment taken along line IV-IV in FIG. 1. FIG. 2 is a cross-sectional perspective view of the lighting fixture according to the embodiment taken along line VV in FIG. 1. FIG. FIG. 4 is a cross-sectional view of the lighting fixture according to the embodiment, showing a part of FIG. 3 in an enlarged manner. It is a top view which shows the lighting fixture based on embodiment in the state where an auxiliary|assistant light guide plate, a light attenuation body, a decorative cover, a light guide plate, a support member, a diffusion cover, etc. are omitted. FIG. 2 is a perspective view of the light attenuator according to the embodiment, viewed from the positive side in the Z-axis direction. FIG. 2 is a perspective view of the light attenuation body according to the embodiment, viewed from the negative side in the Z-axis direction. FIG. 2 is a cross-sectional view showing a positioning structure between a positioning section and a substrate according to an embodiment. FIG. 3 is a perspective view showing the lighting fixture according to the embodiment in a state where the diffusion cover is removed from the support member. FIG. 3 is a plan view of the diffusion cover according to the embodiment viewed from above.

Embodiments of the present invention will be described below. It should be noted that the embodiments described below each represent a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and do not limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims representing the most significant concept of the present invention will be explained as arbitrary constituent elements.

Furthermore, each figure is a schematic diagram and is not necessarily strictly illustrated. In addition, in each figure, the same code|symbol is attached to the substantially the same structure, and the overlapping description is omitted or simplified.

(Embodiment)
Hereinafter, a lighting fixture according to an embodiment will be described.

[1. Overall configuration of lighting equipment]
The overall configuration of a lighting fixture 2 according to an embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view showing the appearance of the lighting fixture 2 on the floor side according to the embodiment. FIG. 2 is a perspective view showing the appearance of the lighting fixture 2 on the ceiling 4 side according to the embodiment. FIG. 3 is an exploded perspective view showing the lighting fixture 2 according to the embodiment. FIG. 4 is a sectional view of the lighting fixture 2 according to the embodiment taken along line IV-IV in FIG.

The lighting fixture 2 is, for example, a ceiling light for illuminating an indoor space 6 (see FIG. 4), and is installed on the indoor ceiling 4 (see FIG. 3). As shown in FIGS. 1 to 4, the lighting fixture 2 includes a fixture main body 8, an adapter 10, a circuit unit 12, a light emitting module 14 (an example of a light emitting part), and an auxiliary light guide plate 16 (a first light guide plate). (an example), a light attenuator 18, a decorative cover 20, a light guide plate 22 (an example of a second light guide plate), a support member 24, and a diffusion cover 26.

Each component of the lighting fixture 2 will be described in detail below. In each figure shown below, the negative side of the Z axis represents the ceiling 4 side, and the positive side of the Z axis represents the floor surface (not shown) side. Furthermore, for convenience of explanation, in FIGS. 1, 3 to 6, 10, and 11, the lighting fixture 2 is shown in an upside-down orientation from the orientation during normal use.

[2. Equipment body]
First, the instrument main body 8 will be explained with reference to FIGS. 2 to 6. FIG. 5 is a cross-sectional perspective view of the lighting fixture 2 according to the embodiment taken along line VV in FIG. 1. FIG. 6 is a cross-sectional view of the lighting fixture 2 according to the embodiment, showing a part of FIG. 3 in an enlarged manner.

The device main body 8 is a casing for supporting the circuit unit 12, the light emitting module 14, and the like. As shown in FIGS. 2 to 6, the instrument body 8 includes a base 28 and a reflective cover 30. As shown in FIGS.

The base 28 is for supporting the circuit unit 12. As shown in FIG. 4, the base 28 is formed in an annular shape when viewed from the XY plane, and has a circular opening 32 in the center. The radial center of the opening 32 of the base 28 is located on the central axis 34 (see FIG. 6) of the lighting fixture 2. Note that the central axis 34 is a straight line parallel to the Z axis. As shown in FIGS. 5 and 6, a flange portion 36 for attaching a reflective cover 30 is formed on the outer periphery of the base 28. As shown in FIGS. The base 28 is formed into the above-described shape by pressing a sheet metal such as an aluminum plate or a steel plate.

As shown in FIGS. 4 to 6, a holder 38 that holds the adapter 10 is fixed to the periphery of the opening 32 of the base 28. As shown in FIGS. The holder 38 extends from the periphery of the opening 32 of the base 28 toward the floor surface. The adapter 10 is removably fitted inside the holder 38 .

Further, as shown in FIGS. 4 to 6, a protective cover 40 for protecting the adapter 10 is attached to one surface (floor side surface) of the base 28. The protective cover 40 has a substantially cylindrical shape and is arranged to surround the holder 38. The protective cover 40 is made of an insulating material such as resin.

Further, as shown in FIGS. 2 and 4, a plurality of cushion members 42 made of, for example, urethane are attached to the other surface (the surface on the ceiling 4 side) of the base 28. The plurality of cushion members 42 are arranged at equal intervals along the circumferential direction of the base 28. When the lighting fixture 2 is installed on the ceiling 4 as described below, the plurality of cushion members 42 are sandwiched between the base 28 and the ceiling 4, thereby suppressing wobbling of the fixture body 8.

The reflective cover 30 is for supporting the light emitting module 14 and reflecting light from the light emitting module 14. Note that the reflective cover 30 also functions as a heat sink for dissipating heat from the light emitting module 14. As shown in FIGS. 4 to 6, the reflective cover 30 is formed in an annular shape and has a substantially circular opening 44 in the center. A flange portion 46 is formed on the outer periphery of the reflective cover 30. The reflective cover 30 is formed into the above-described shape by, for example, pressing a sheet metal such as an aluminum plate or a steel plate. Note that a white paint is applied or a reflective metal material is deposited on one surface (floor side surface) of the reflective cover 30 in order to increase reflectivity and improve light extraction efficiency. .

As shown in FIGS. 4 to 6, the reflective cover 30 is arranged to cover one side of the base 28. As shown in FIGS. The flange portion 46 of the reflective cover 30 is attached to the flange portion 36 of the base 28 with screws (not shown). Further, the peripheral edge of the opening 44 of the reflective cover 30 is supported by the tip of the protective cover 40. Note that an accommodation space 48 for accommodating the circuit unit 12 (described later) is formed between the base 28 and the reflective cover 30.

[3. adapter]
Next, the adapter 10 will be explained with reference to FIGS. 2 to 6. The adapter 10 is used to removably attach the instrument body 8 to a hook ceiling body 50 (see FIG. 3) installed in advance on the ceiling 4 of the room.

As shown in FIGS. 2 and 4 to 6, the adapter 10 is removably fitted into the holder 38 of the instrument body 8. Further, as shown in FIG. 3, the adapter 10 is detachably attached to the hook ceiling body 50.

When installing the lighting fixture 2 on the indoor ceiling 4, the user first hooks the adapter 10 and attaches it to the ceiling body 50. Thereafter, the user inserts the adapter 10 into the holder 38 of the instrument main body 8 and pushes the instrument main body 8 toward the ceiling 4 to fit the holder 38 and the adapter 10 together. Thereby, the fixture main body 8 is attached to the indoor ceiling 4 via the adapter 10 and the hook ceiling body 50, and the lighting fixture 2 is installed on the indoor ceiling 4.

Note that the hook ceiling body 50 is electrically connected to a commercial power source (not shown) placed on the back side of the ceiling 4 in the room via an electric wire (not shown). By installing the lighting fixture 2 on the ceiling 4 indoors, AC power from a commercial power source is supplied to the circuit unit 12 of the lighting fixture 2 via the electric wire and the hook ceiling body 50.

[4. Circuit unit]
Next, the circuit unit 12 will be explained with reference to FIGS. 4 to 6. The circuit unit 12 is a unit that generates electric power for lighting the light emitting module 14 and controls turning on and off of the light emitting module 14.

As shown in FIGS. 4 to 6, the circuit unit 12 includes a board 52 and a plurality of circuit components 54 mounted on the board 52. The circuit unit 12 is housed in a housing space 48 formed between the base 28 and the reflective cover 30.

The board 52 is a printed wiring board on which a plurality of circuit components 54 are mounted. The board 52 is attached to one side of the base 28 of the instrument body 8 with screws (not shown). Note that as the substrate 52, for example, a resin substrate, a metal base substrate, a ceramic substrate, a glass substrate, or the like can be used. Further, the substrate 52 is not limited to a rigid substrate, and may be a flexible substrate.

The plurality of circuit components 54 are mounted on the mounting surface (floor side surface) of the board 52. The plurality of circuit components 54 include a power supply circuit component and a control circuit component. The power supply circuit component constitutes a power supply circuit for generating electric power for lighting the light emitting module 14. The power supply circuit converts the AC power supplied from the above-mentioned commercial power source via the electric wire into DC power, and supplies the DC power to the light emitting module 14 . The light emitting module 14 is lit by supplying the DC power generated by the power supply circuit to the light emitting module 14. Further, the control circuit component constitutes a control circuit for controlling turning on and off of the light emitting module 14.

Note that the plurality of circuit components 54 include, for example, a) a capacitive element such as an electrolytic capacitor or a ceramic capacitor, b) a resistive element such as a resistor, c) a rectifier circuit element, d) a coil element, and e) a choke coil (choke transformer). ), f) a noise filter, g) a semiconductor element such as a diode or an integrated circuit element, etc.

[5. Light emitting module]
Next, the light emitting module 14 will be explained with reference to FIGS. 3 to 7. FIG. 7 is a plan view showing the lighting fixture 2 according to the embodiment in a state where the auxiliary light guide plate 16, the decorative cover 20, the light guide plate 22, the support member 24, the diffusion cover 26, etc. are omitted. In addition, in FIG. 7, the light attenuator 18 is shown by a broken line.

The light emitting module 14 is, for example, a light source for emitting white light. As shown in FIGS. 3 to 7, the light emitting module 14 includes a plurality of substrates 56, and a plurality of first light emitting elements 58 and a plurality of second light emitting elements 60 mounted on each of the plurality of substrates 56. have. That is, the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 are mounted on the same substrate 56.

As shown in FIG. 7, each of the plurality of substrates 56 is a printed wiring board for mounting a plurality of first light emitting elements 58 and a plurality of second light emitting elements 60, and is formed in a substantially arc shape. There is. The plurality of substrates 56 are arranged in an annular shape so as to surround the opening 44 of the reflective cover 30 of the instrument main body 8, and are attached to one surface of the reflective cover 30 with screws 62. Note that as the substrate 56, for example, a resin substrate, a metal base substrate, a ceramic substrate, a glass substrate, or the like can be used. Further, the substrate 56 is not limited to a rigid substrate, but may be a flexible substrate.

As shown in FIG. 7, a first light source section 141 arranged in an annular manner is provided on the inner circumferential side of the mounting surface (floor side surface) of the board 56, and a first light source section 141 arranged in an annular manner is provided on the outer circumferential side. A second light source section 142 arranged annularly is provided. The second light source section 142 is arranged to surround the first light source section 141.

The first light source section 141 includes a plurality of first light emitting elements 58 and a plurality of second light emitting elements 60. The elements 60 are arranged in an annular shape. In the first light source section 141, the number of second light emitting elements 60 installed is smaller than the number of first light emitting elements installed. The second light emitting elements 60 are arranged approximately evenly around the entire circumference of the first light source section 141.

The second light source section 142 includes a plurality of first light emitting elements 58 and a plurality of second light emitting elements 60. The elements 60 are arranged in an annular shape. In the second light source section 142, the number of second light emitting elements 60 installed is smaller than the number of first light emitting elements installed. The second light emitting elements 60 are arranged approximately evenly around the entire circumference of the second light source section 142.

Each of the first light emitting element 58 and the second light emitting element 60 is, for example, a packaged surface mount device (SMD) type LED (Light Emitting Diode) element. That is, each of the first light emitting element 58 and the second light emitting element 60 includes a white resin package (container) having a recess, an LED chip primarily mounted on the bottom surface of the recess of the package, and an LED chip mounted inside the recess of the package. It has a sealing member enclosed in. The LED chip is, for example, a blue LED chip that emits blue light. The sealing member contains a yellow phosphor such as YAG (yttrium aluminum garnet) that emits fluorescence using blue light from a blue LED chip as excitation light. The first light emitting element 58 and the second light emitting element 60 emit light with different color temperatures. Specifically, the first light emitting element 58 emits white light, and the second light emitting element 60 emits light bulb color light. Although the installed number ratio of the first light emitting element 58 and the second light emitting element 60 may be arbitrary, it is preferably 2:1.

[6. Auxiliary light guide plate]
Next, the auxiliary light guide plate 16 will be explained with reference to FIGS. 3 to 6. The auxiliary light guide plate 16 is an optical member for guiding light from the first light source section 141 to the indoor space 6 via the diffusion cover 26.

As shown in FIGS. 3 to 6, the auxiliary light guide plate 16 is formed in an annular shape when viewed from the XY plane. Specifically, the auxiliary light guide plate 16 has an entrance section 66 (an example of a first entrance section) and an output section 68 (an example of a first output section). As shown in FIG. 6, the outer peripheral side of the auxiliary light guide plate 16 is supported by the inner peripheral sides of each of the plurality of substrates 56 of the light emitting module 14. Further, the inner peripheral side of the auxiliary light guide plate 16 is attached to the inner peripheral side of one surface of the reflective cover 30 with screws 64 (see FIG. 11 described later). Note that the auxiliary light guide plate 16 is made of a light-transmitting material, such as transparent acrylic resin.

As shown in FIGS. 5 and 6, the incident section 66 is formed on the outer circumference of the auxiliary light guide plate 16. As shown in FIGS. Specifically, the incident portion 66 is an annular groove formed on the back surface 70 (described later) side of the auxiliary light guide plate 16. The inner peripheral surface of the entrance portion 66 is an entrance surface 66a. The entrance surface 66a is arranged at a position opposite to and close to the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 forming the first light source section 141. Thereby, the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 forming the first light source section 141 are arranged along the circumferential direction of the entrance surface 66a, and allow light to enter the entrance surface 66a. . A plurality of first light emitting elements 58 and a plurality of second light emitting elements 60 forming the first light source section 141 are housed in an entrance section 66 that is an annular groove. Note that the angle of inclination of the incident surface 66a with respect to the output surface 68a of the auxiliary light guide plate 16 is, for example, 40° to 45°.

As shown in FIGS. 5 and 6, the output section 68 is formed on one surface of the auxiliary light guide plate 16 (the surface facing the diffusion cover 26). Specifically, the output section 68 has an output surface 68a (an example of a first output surface) formed on one side of the auxiliary light guide plate 16. The emission surface 68a is arranged in a substantially horizontal position (that is, substantially parallel to the ceiling 4) so as to face the diffusion cover 26. On the back surface 70, which is the other surface (the surface opposite to the output surface 68a) of the auxiliary light guide plate 16, a low-angle prism is formed by, for example, dot processing. The light from the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 that entered the incident surface 66a of the auxiliary light guide plate 16 is reflected by the low angle prism, and is diffused and output from the output surface 68a. do. The light emitted from the emission surface 68a enters the diffusion cover 26.

[7. Attenuator]
Next, the light attenuator 18 will be explained with reference to FIGS. 3 to 9. FIG. 8 is a perspective view of the light attenuator 18 viewed from the positive side in the Z-axis direction. FIG. 9 is a perspective view of the light attenuator 18 viewed from the negative side in the Z-axis direction. The light attenuator 18 is a member for attenuating the light emitted from the first light source section 141 and transmitted through the auxiliary light guide plate 16. The light attenuator 18 is made of, for example, white polycarbonate resin. The light attenuator 18 only needs to have a transmittance of 50% or less for light in the visible wavelength range, and is better if it has a transmittance of 40% or less. The transmittance of the light attenuator 18 may be 0%.

Specifically, the light attenuation body 18 includes a main body portion 72 that is annular in shape when viewed in the Z-axis direction, a plurality of positioning portions 74, and a plurality of locking pieces 75. As shown in FIGS. 5 to 7, the main body section 72 faces the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 forming the first light source section 141 in the Z-axis direction. There is. Specifically, as shown in FIG. 6, the main body part 72 includes an auxiliary light guide plate for all of the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 that constitute the first light source part 141. They are arranged opposite to each other via 16. That is, the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 forming the first light source section 141 are covered by the main body section 72 at their lower portions (positive side in the Z-axis direction). Some of the light emitted by these light emitting elements enters the entrance surface 66a of the auxiliary light guide plate 16 and is guided toward the exit surface 68a, but the other light is directed directly above the entrance surface 66a. To Penetrate. This transmitted light is attenuated by passing through the main body portion 72.

As shown in FIGS. 7 to 9, the plurality of positioning parts 74 are arranged at equal intervals in the circumferential direction with respect to the outer peripheral part of the main body part 72. In this embodiment, three positioning sections 74 are provided, but any number of positioning sections 74 may be provided. The positioning portion 74 protrudes radially outward from the outer circumferential portion of the main body portion 72, and also protrudes upward (negative side in the Z-axis direction). The positioning part 74 extends along the circumferential direction, and both ends thereof are connected to the main body part 72. As shown in FIG. 8, a pair of protrusions 77 are provided on the upper surface of the positioning portion 74 and are arranged at a predetermined interval in the circumferential direction. The pair of protrusions 77 are positioned by engaging with the substrate 56, respectively.

The positioning structure between the positioning section 74 and the substrate 56 will be described in detail. FIG. 10 is a cross-sectional view showing a positioning structure between the positioning section 74 and the substrate 56. As shown in FIGS. 7 and 10, a pair of through holes 57 for positioning the light attenuator 18 are formed in each substrate 56. As shown in FIGS. A pair of protrusions 77 of the positioning portion 74 are inserted into the pair of through holes 57 and positioned. In other words, the substrate 56 and the light attenuator 18 are positioned. Since the substrate 56 is provided with a plurality of first light emitting elements 58 and a plurality of second light emitting elements 60 forming the first light source section 141, these light emitting elements and the light attenuator 18 are also positioned. It will be done. Each positioning section 74 is supported from below by being covered by the support member 24.

Further, as shown in FIG. 7, in the positioned state, each positioning section 74 is arranged radially outward of the first light source section 141. Furthermore, each positioning section 74 is arranged at a position that is not adjacent to the plurality of second light emitting elements 60 forming the first light source section 141 in the radial direction. In other words, only the plurality of first light emitting elements 58 are arranged radially inward in each positioning portion 74 . Each positioning part 74 is also an element that blocks light, but if each positioning part 74 is arranged near the second light emitting element 60, which has a smaller number than the first light emitting element 58, the second light emitting element 60, which has a smaller amount of light, The light from the second light emitting element 60 is reduced more than necessary. For this reason, in this embodiment, by arranging each positioning part 74 at a position that is not adjacent to the plurality of second light emitting elements 60 in the radial direction, the light from the second light emitting elements 60 is more than necessary. This prevents the light from being dimmed.

As shown in FIGS. 7 to 9, the plurality of locking pieces 75 are arranged at equal intervals in the circumferential direction with respect to the outer periphery of the main body portion 72. As shown in FIGS. Specifically, each of the plurality of locking pieces 75 is arranged at an intermediate position between the plurality of positioning parts 74. Each locking piece 75 is arranged at a boundary between each board 56 . The locking piece 75 reduces light leaking from the boundary portion.

[8. Makeup cover]
Next, the decorative cover 20 will be explained with reference to FIGS. 3 to 6. The decorative cover 20 is a cover for covering the device main body 8 from the side to apply makeup.

As shown in FIGS. 3 to 6, the decorative cover 20 is formed in a trumpet-like shape that spreads from one end (the end on the floor side) to the other end (the end on the ceiling 4 side). . As shown in FIGS. 5 and 6, the decorative cover 20 is arranged to cover the instrument main body 8 from the side, and is supported by the flange portion 46 of the reflective cover 30. Note that the decorative cover 20 is made of, for example, polystyrene resin.

[9. Light guide plate]
Next, the light guide plate 22 will be explained with reference to FIGS. 1 to 6. The light guide plate 22 is an optical member for guiding the light from the second light source section 142 into the indoor space 6.

As shown in FIGS. 3 to 6, the light guide plate 22 is formed in an annular shape when viewed from the XY plane, and has a circular opening 76 (see FIG. 3) in the center. The light guide plate 22 is arranged so as to surround the auxiliary light guide plate 16. The light guide plate 22 includes a curved portion 78 , an incident portion 80 (an example of a second incident portion), an output portion 82 (an example of a second output portion), and a plurality of attachment portions 84 . Note that the light guide plate 22 is made of a light-transmitting material, such as transparent acrylic resin.

The curved portion 78 expands in diameter while curving like a trumpet from one end (end on the ceiling 4 side) to the other end (end on the floor side). The concave side of the curved portion 78 is supported by one end of the decorative cover 20, and the convex side of the curved portion 78 is supported by a support member 24 (described later). That is, the curved portion 78 is held between the decorative cover 20 and the support member 24. The curved portion 78 guides the light that has entered the entrance portion 80 from one end of the curved portion 78 to the other end.

The incidence section 80 is formed in an annular shape over the entire circumference of one end of the curved section 78 . The incidence section 80 is arranged at a position opposite to and close to the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 forming the second light source section 142 . Thereby, the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 forming the second light source section 142 are arranged along the circumferential direction of the entrance section 80 and allow light to enter the entrance section 80. .

The output section 82 extends radially outward of the light guide plate 22 from the entire circumference of the other end of the curved section 78, and is formed in an annular shape when viewed from the XY plane. As shown in FIGS. 1 and 2, the emission section 82 protrudes outward in the radial direction of the light guide plate 22 from one end of the decorative cover 20, and is arranged in a substantially horizontal position. As shown in FIGS. 5 and 6, one surface (floor side surface) of the light emitting unit 82 has a planar light emitting surface 82a (second light emitting surface) that emits light toward the indoor space 6. An example of a surface) is formed. A low-angle prism is formed on the other surface (the surface on the ceiling 4 side) of the emission section 82 by, for example, dot processing. The light guided from the curved portion 78 to the output section 82 is reflected by the low-angle prism, and is diffused and output from the output surface 82a of the output section 82. The light emitted from the emission surface 82a is irradiated toward the indoor space 6.

Note that, as shown in FIG. 6, an annular sealing member 86 made of, for example, a rubber material is interposed between the emission part 82 and the decorative cover 20. The sealing member 86 seals the gap between the emission part 82 and the decorative cover 20 over the entire circumference of the emission part 82 in the circumferential direction. Thereby, insects and the like can be prevented from entering the inside of the lighting fixture 2 through the gap between the emission part 82 and the decorative cover 20.

Further, as shown in FIG. 6, the output surface 68a of the auxiliary light guide plate 16 is arranged on a plane different from the plane including the output surface 82a of the light guide plate 22. Specifically, the output surface 68a of the auxiliary light guide plate 16 is arranged closer to the light emitting module 14 than the output surface 82a of the light guide plate 22. Note that the distance between the output surface 68a of the auxiliary light guide plate 16 and the output surface 82a of the light guide plate 22 in the Z-axis direction is, for example, about 30 mm.

Each of the plurality of attachment parts 84 extends from the entrance part 80 toward the inside of the light guide plate 22 in the radial direction. As shown in FIG. 3, the plurality of attachment parts 84 are arranged at intervals in the circumferential direction of the incidence part 80. Each of the plurality of attachment parts 84 is provided with a screw (not shown) in a predetermined area of the substrate 56 of the light emitting module 14 (the area between the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60). It is attached with.

[10. Supporting member]
Next, the support member 24 will be explained with reference to FIGS. 3 to 6 and FIG. 11. FIG. 11 is a perspective view showing the lighting fixture 2 according to the embodiment with the diffusion cover 26 removed from the support member 24.

The support member 24 is for supporting the diffusion cover 26. As shown in FIGS. 3 to 6, the support member 24 is formed in an annular shape when viewed from the XY plane. The support member 24 is made of, for example, a light-shielding material (for example, an opaque resin material). As shown in FIGS. 5 and 6, the support member 24 is arranged to cover the convex side of the curved portion 78 of the light guide plate 22 and the plurality of attachment portions 84.

The support member 24 also has the function of supporting the light attenuator 18 . Specifically, as shown in FIG. 10, the inner edge portion 241 of the support member 24 is arranged to cover the lower part of the positioning portion 74 of the light attenuator 18. Thereby, the inner edge portion 241 of the support member 24 restricts the downward movement of each positioning portion 74. In other words, the inner edge portion 241 can support the light attenuator 18 from below. Note that the inner edge portion 241 may sandwich each positioning portion 74 together with the substrate 56 fixed to the instrument main body 8. In this case, the light attenuator 18 will be positioned more firmly.

As shown in FIG. 11, a plurality of engaging portions 88 are formed on the inner peripheral portion of the support member 24. As shown in FIG. The plurality of engaging portions 88 are arranged at intervals in the circumferential direction of the support member 24. The engaging portion 88 is a wall portion extending along the circumferential direction, and has an upright portion 881 erected upward at one end thereof.

Note that the support member 24 has a function of shielding light between the light guide plate 22 and the auxiliary light guide plate 16 in addition to the above-mentioned function. Thereby, the light emitted from the output surface 68a of the auxiliary light guide plate 16 is blocked by the support member 24, and is suppressed from entering the convex side of the curved portion 78 of the light guide plate 22. Furthermore, the support member 24 may have a function of reflecting the light that has passed through the auxiliary light guide plate 16 and the light that has passed through the light attenuator 18 . Specifically, by making the inner circumferential surface of the support member 24 white, for example, it is possible to realize the reflective function.

[11. Diffusion cover]
Next, the diffusion cover 26 will be explained with reference to FIGS. 1, 3 to 6, 11, and 12. FIG. 12 is a plan view of the diffusion cover 26 viewed from above.

The diffusion cover 26 is a cover for diffusing the light from the output surface 68a of the auxiliary light guide plate 16 toward the indoor space 6 (that is, transmitting the light from the light emitting module 14 toward the indoor space 6). be.

As shown in FIG. 1, FIG. 3 to FIG. 6, and FIG. It is arranged so as to face the output surface 68a. That is, the light guide plate 22 is arranged so as to surround the diffusion cover 26. The diffusion cover 26 is made of a translucent material (eg, milky white acrylic resin).

The diffusion cover 26 is formed with a planar output surface 90 that outputs light toward the indoor space 6. As shown in FIG. 6, the output surface 90 of the diffusion cover 26 and the output surface 82a of the light guide plate 22 are arranged on the same plane and are arranged so as not to overlap each other in the XY plane view.

As shown in FIGS. 11 and 12, a plurality of engaged portions 92 are provided on the outer periphery of the diffusion cover 26. As shown in FIGS. The plurality of engaged parts 92 are arranged at intervals in the circumferential direction of the diffusion cover 26, corresponding to the plurality of engaging parts 88 of the support member 24.

The plurality of engaged portions 92 have a first convex portion 921 and a second convex portion 922 that protrude radially outward. The first convex portion 921 and the second convex portion 922 are arranged at predetermined intervals along the circumferential direction. The first convex portion 921 is disposed on the downstream side in the rotation direction (arrow P) at the time of attachment, and the second convex portion 922 is disposed on the upstream side. The amount of radial protrusion of the second convex portion 922 is smaller than the amount of protrusion of the first convex portion 921 . Further, the length of the second convex portion 922 in the circumferential direction is shorter than the length of the first convex portion 921.

When attaching the diffusion cover 26 to the support member 24, the user brings the diffusion cover 26 close to the opening 76 of the light guide plate 22, and moves the diffusion cover 26 with respect to the support member 24 in the direction indicated by arrow P in FIG. Rotate. Here, the overall length of the engaged portion 92 in the circumferential direction is longer than that of the first convex portion 921 alone. Therefore, when attaching the diffusion cover 26 to the support member 24, each engaged portion 92 rotates along the inner peripheral portion of the support member 24. At this time, even if the diffusion cover 26 tries to tilt, not only the first convex portion 921 but also the second convex portion 922 of each engaged portion 92 will come into contact with the inner peripheral portion of the support member 24. , and its slope is regulated. In other words, the diffusion cover 26 as a whole becomes less likely to tilt with respect to the support member 24, so that it continues to rotate in a normal posture. Thereafter, the first convex portion 921 passes through the upright portion 881 of the support member 24 and fits into the engaging portion 88, and the second convex portion 922 is disposed outside the engaging portion 88. Since the upright portion 881 is disposed in the gap between the first convex portion 921 and the second convex portion 922, interference of the upright portion 881 with the support member 24 after attachment is suppressed. This allows the diffusion cover 26 to be maintained in its normal position even after attachment.

On the other hand, when removing the diffusion cover 26 from the support member 24, the user rotates the diffusion cover 26 with respect to the support member 24 in the direction shown by arrow Q in FIG. As a result, the plurality of engaged parts 92 are separated from the plurality of engaging parts 88, and the diffusion cover 26 is removed from the support member 24.

[12. Lighting method using lighting equipment]
Next, an illumination method using the above-mentioned lighting fixture 2 will be described with reference to FIG. 6.

By supplying DC power from the circuit unit 12 to the light emitting module 14, each of the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 emits light.

As shown in FIG. 6, in the first light source section 141, light from the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 directly enters the incident surface 66a of the auxiliary light guide plate 16. . The light incident on the incident surface 66a of the auxiliary light guide plate 16 travels inside the auxiliary light guide plate 16 and exits from the output surface 68a. The light emitted from the output surface 68a of the auxiliary light guide plate 16 enters the diffusion cover 26. The light incident on the diffusion cover 26 is diffused and emitted from the output surface 90 of the diffusion cover 26, and is irradiated toward the indoor space 6.

Further, as shown in FIG. 6, in the second light source section 142, the light from the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 enters the incident part 80 of the light guide plate 22. Afterwards, it is guided to the curved section 78. The light guided to the curved section 78 is guided toward the emission section 82. The light guided to the emission part 82 is emitted from the emission surface 82a of the emission part 82, and is irradiated toward the indoor space 6.

[13. effect]
As described above, according to the present embodiment, the lighting device 2 for illuminating the space 6 includes the device main body 8, the substrate 56 supported by the device main body 8, and the light emitting device provided on the substrate 56. A module 14 (light emitting section), an auxiliary light guide plate 16 (first light guide plate) that covers the light emitting module 14 and guides light from the light emitting module 14 toward the space 6, and emits light through the auxiliary light guide plate 16. and a light attenuation body 18 disposed at a position facing the module 14 , and the light attenuation body 18 has a positioning portion 74 positioned with respect to the substrate 56 .

According to this, since the light from the light emitting module 14 is guided by the auxiliary light guide plate 16 with high diffusivity, it is possible to arrange the auxiliary light guide plate 16 closer to the light emitting module 14. Thereby, the lighting fixture 2 itself can be made thinner. Here, when the auxiliary light guide plate 16 is placed close to the light emitting module 14, directly below the light emitting elements of the light emitting module 14 (the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 in the first light source section 141). The brightness becomes high at . At this location, the light attenuator 18 is disposed via the auxiliary light guide plate 16, so the light attenuator 18 attenuates the light transmitted through the auxiliary light guide plate 16 at this location. Therefore, brightness unevenness is suppressed and uniformity can be improved.

Furthermore, since the positioning part 74 of the light attenuator 18 is positioned with respect to the substrate 56, the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 forming the first light source part 141 are The light attenuator 18 is also positioned. Therefore, even if the substrate 56 moves due to vibration or impact, for example, the light attenuator 18 follows the movement and always maintains the same position relative to the light emitting element. This makes it possible to always maintain a constant degree of symmetry. With these features, it is possible to stably improve the uniformity of illumination light while reducing the thickness of the lighting fixture.

Further, the light emitting module 14 has a first light source section 141 arranged in an annular shape, and the first light source section 141 includes a plurality of first light emitting elements 58 and a color temperature of the first light emitting element 58. The plurality of second light emitting elements 60 are installed in a smaller number than the plurality of first light emitting elements 58, and the light attenuator 18 is provided with It is formed in an annular shape so as to face the plurality of first light emitting elements 58 and the plurality of second light emitting elements 60 via the light plate 16, and the positioning part 74 is arranged to face the plurality of second light emitting elements 60. They are placed in positions that are not adjacent to each other.

According to this, since each positioning part 74 is arranged at a position that is not adjacent to the plurality of second light emitting elements 60, the light from the second light emitting elements 60 installed in a small number is reduced more than necessary. It is possible to suppress exposure to light. Therefore, it is possible to further improve the degree of symmetry.

Further, the light emitting module 14 has a second light source section 142 arranged in a ring shape so as to surround the first light source section 141, and the lighting fixture 2 is arranged in a ring shape so as to surround the auxiliary light guide plate 16, A light guide plate 22 (second light guide plate) that guides light from the second light source section 142 toward the space 6 is provided.

According to this, since the light guide plate 22 is arranged so as to surround the auxiliary light guide plate 16, the area illuminated by the light from the output surface 82a of the light guide plate 22 and the area illuminated by the light from the output surface 68a of the auxiliary light guide plate 16 are illuminated. The overlapping area of the illumination area with the light emission can be further increased. As a result, the degree of uniformity of the illumination light from the lighting fixture 2 can be further improved.

Further, a diffusion cover 26 is provided to diffuse the light from the auxiliary light guide plate 16 toward the space 6, and the diffusion cover 26 and the light guide plate 22 are arranged flush.

According to this, since the light from the auxiliary light guide plate 16 is diffused by the diffusion cover 26, the degree of uniformity on the diffusion cover 26 can be further improved. For example, even if the light attenuated by the light attenuator 18 has significantly lower brightness than the light emitted from the auxiliary light guide plate 16, the diffusion cover 26 diffuses the light, so that the light is not evenly distributed. The degree of this will be further increased.

Further, since the diffusion cover 26 is disposed flush with the light guide plate 22, the diffusion cover 26 does not protrude from the light guide plate 22, and the thickness can be further reduced. Further, by arranging the diffusion cover 26 flush with the light guide plate 22, the visual integrity of the diffusion cover 26 and the light guide plate 22 can be improved.

The lighting fixture 2 also includes an annular support member 24 that fixes the light attenuator 18 to the fixture body 8 by engaging with a plurality of positioning parts 74. is locked.

According to this, the support member 24 has both the function of fixing the light attenuator 18 to the device main body 8 and the function of locking the diffusion cover 26, so compared to the case where separate dedicated members are provided. It is also possible to reduce the number of parts. If the number of parts can be reduced, it is possible to further downsize (thin) the lighting fixture 2 itself.

Further, the plurality of positioning portions 74 are provided on the outer periphery of the light attenuator 18 .

According to this, since the plurality of positioning parts 74 are provided on the outer periphery of the light attenuation body 18, it is easy to arrange each positioning part 74 outside the auxiliary light guide plate 16. Thereby, it is possible to easily position the positioning section 74 with respect to the substrate 56.

(Modified examples, etc.)
Although the present invention has been described above based on the above embodiments, the present invention is not limited to the above embodiments.

In the embodiment described above, the light guide plate 22 is arranged so as to surround the auxiliary light guide plate 16, but the present invention is not limited thereto. Alternatively, the light guide plate 22 and the auxiliary light guide plate 16 may be arranged as desired.

In the above embodiment, the lighting fixture 2 was explained as having the auxiliary light guide plate 16 which is the first light guide plate and the light guide plate 22 which is the second light guide plate. The lighting fixture may include only a light guide plate.

Furthermore, in the embodiment described above, the incident portion 66 of the auxiliary light guide plate 16 is an annular groove formed on the back surface 70, but the incident portion may be the outer circumferential surface of the auxiliary light guide plate.

In the above embodiment, the lighting fixture 2 is a ceiling light, but the lighting fixture 2 is not limited to this, and may be, for example, a chandelier, a pendant light, a bracket light, a bathroom light, a kitchen light, or the like.

Further, in the above embodiment, the mounting structure of the first light emitting element 58 and the second light emitting element 60 is an SMD structure, but the structure is not limited to this, and for example, a COB ( It may also have a chip-on-board (Chip On Board) structure. In this case, the plurality of LED chips mounted on the substrate 56 may be sealed together or individually using the sealing member. Further, the sealing member may contain a wavelength conversion material such as the above-mentioned yellow phosphor.

Further, in the above embodiment, LEDs are illustrated as the first light emitting element 58 and the second light emitting element 60, but the invention is not limited to this, and for example, semiconductor light emitting elements such as semiconductor lasers, organic EL (Electro Luminescence), or Other solid state light emitting devices such as inorganic EL may also be used.

Further, the lighting fixture 2 may include, for example, an ion generating section for generating negative ions. The ion generating section is arranged, for example, inside the instrument main body 8. The ion generating section includes a needle discharge electrode, a high voltage generation circuit that applies a high voltage (for example, about 6000 V) to the needle discharge electrode, and a Peltier element that cools the needle discharge electrode. The needle-shaped discharge electrode is cooled by the Peltier effect of the Peltier element, thereby forming dew condensation. By applying a high voltage to the moisture in the air that has condensed on the needle discharge electrode, a high voltage generation circuit generates negative ions (so-called nanoe Registered trademark)). The negative ions generated by the ion generator are blown out of the device main body 8 by a blower fan or the like disposed inside the device main body 8, and diffused into the room.

Furthermore, nanoe can exist in the air for a longer period of time than negative ions alone (with a lifespan approximately 6 times that of negative ions), and because it is extremely small (nanometer size), it can be used to absorb energy throughout the room. It can diffuse evenly and remain suspended for a long time. Nanoe is known to have high reactivity and the ability to act on odor components and decompose them into odorless components. Therefore, when nanoe diffuses indoors, it has the following effects: a) Deodorizing curtains or floating dust in the room, b) Inactivating allergens, viruses, etc. floating or attached to the room, and c) Floating in the room. Alternatively, the effect of sterilizing attached mold, bacteria, etc. can be obtained.

Furthermore, the lighting fixture 2 may include a human sensor that detects the presence of a person indoors, and an image sensor that has a camera function to capture an image of the surroundings of the lighting fixture 2. The image sensor is, for example, a complementary metal oxide semiconductor (CMOS) image sensor. In this case, when the human sensor detects a person in the room, an image captured by the image sensor can be stored in a memory or the like as a crime prevention measure.

Furthermore, the lighting fixture 2 may include a speaker that outputs the sound received by the lighting fixture 2 by wire or wirelessly. In this case, the speaker may be controlled so that, for example, sound is output from the speaker in synchronization with lighting of the light emitting module.

Other embodiments may be obtained by making various modifications to the above-described embodiments that those skilled in the art may think of, or by arbitrarily combining the components and functions of the above-described embodiments without departing from the spirit of the present invention. The form is also included in the present invention.

2 Lighting equipment 6 Space 8 Equipment main body 14 Light emitting module (light emitting part)
16 Auxiliary light guide plate (first light guide plate)
18 Light attenuation body 22 Light guide plate (second light guide plate)
24 Support member 26 Diffusion cover 56 Substrate 58 First light emitting element 60 Second light emitting element 74 Positioning section 141 First light source section 142 Second light source section

Claims (6)

A lighting fixture for illuminating a space,
The instrument body,
a substrate supported by the instrument body;
a light emitting section provided on the substrate;
a first light guide plate that covers the light emitting section and guides light from the light emitting section toward the space;
a light attenuator disposed at a position facing the light emitting part via the first light guide plate,
The light attenuation body has a flat and annular main body facing the light emitting part, and a positioning part that projects outward from an outer peripheral part of the main body and is positioned with respect to the substrate,
A portion of the first light guide plate that faces the main body portion is a flat surface.
lighting equipment. The light emitting section has a first light source section arranged in an annular shape,
The first light source section includes a plurality of first light emitting elements and a plurality of second light emitting elements that emit light with a different color temperature from the first light emitting elements,
The plurality of second light emitting elements are installed less in number than the plurality of first light emitting elements,
The light attenuation body is formed in an annular shape so as to face the plurality of first light emitting elements and the plurality of second light emitting elements via the first light guide plate,
The lighting fixture according to claim 1, wherein a plurality of the positioning parts are arranged at positions that are not adjacent to the plurality of second light emitting elements. The light emitting section has a second light source section arranged annularly so as to surround the first light source section,
The lighting equipment includes:
The lighting fixture according to claim 2, further comprising a second light guide plate that is arranged annularly to surround the first light guide plate and guides light from the second light source toward the space. comprising a diffusion cover that diffuses light from the first light guide plate toward the space;
The lighting fixture according to claim 3, wherein the diffusion cover and the second light guide plate are arranged flush. an annular support member that fixes the light attenuator to the instrument body by engaging with the plurality of positioning parts;
The lighting fixture according to claim 4, wherein the diffusion cover is locked to the support member. The lighting fixture according to any one of claims 2 to 5, wherein the plurality of positioning parts are provided on the outer periphery of the light attenuation body.

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