JP7033748B2 - Lighting equipment - Google Patents

Description

The present disclosure relates to lighting equipment. More specifically, the present disclosure relates to a lighting device including a plurality of light emitting elements.

Conventionally, a lighting fixture installed in a building material such as a house is known (see, for example, Patent Document 1). The luminaire described in Patent Document 1 includes a plurality of light emitting modules, a light source cover, and a light guide plate.

A plurality of light emitting modules are arranged adjacent to each other so as to form a ring. Each of the plurality of light emitting modules has a light source substrate, a plurality of first light emitting elements, and a plurality of second light emitting elements. The plurality of first light emitting elements are arranged at intervals in the circumferential direction of the light source substrate in the inner region of the light source substrate. The plurality of second light emitting elements are arranged at intervals in the circumferential direction of the light source substrate in the outer region of the light source substrate.

The light source cover covers a plurality of first light emitting elements provided in the light emitting module, and transmits light emitted by the plurality of first light emitting elements. The light guide plate is formed in a ring shape, and guides the light emitted from each of the plurality of second light emitting elements to the outside of the luminaire.

Japanese Unexamined Patent Publication No. 2018-107028

In a lighting fixture (lighting device) as described in Patent Document 1, it is desired to realize a desired light distribution characteristic while reducing the number of first light emitting elements.

An object of the present disclosure is to provide a lighting device capable of realizing desired light distribution characteristics while reducing the number of light emitting elements that irradiate a lighting space with light through a cover.

The lighting device according to one aspect of the present disclosure includes a plurality of first light emitting elements and a plurality of second light emitting elements. The plurality of first light emitting elements irradiate the illumination space with light through the cover. The plurality of second light emitting elements irradiate the illumination space with light via the light guide member. Each of the plurality of first light emitting elements is located on the first virtual line with a first distance from the adjacent first light emitting element in a plan view from one direction. Each of the plurality of second light emitting elements has a second distance from the adjacent second light emitting element in a plan view from the one direction, and is outside the first virtual line. 2 Located on a virtual line. The third distance between the first light emitting element and the second light emitting element in the direction in which the first virtual line and the second virtual line are lined up is the plurality of first light emitting elements and the plurality of second light emitting elements. At least a part of the elements is at least the second interval and smaller than the first interval.

According to the present disclosure, there is an effect that a desired light distribution characteristic can be realized while reducing the number of light emitting elements that irradiate the illumination space with light through the cover.

FIG. 1 is an exploded perspective view of the lighting device according to the embodiment. FIG. 2A is a plan view of the substrate and the light emitting portion of the same lighting device. FIG. 2B is a partially enlarged view of FIG. 2A. FIG. 3A is a plan view of the cover of the lighting device of the same. FIG. 3B is a side view of the cover of the same lighting device. FIG. 4A is a plan view of the fixing member of the lighting device of the same as above. FIG. 4B is a bottom view of the fixing member of the lighting device of the same as above. FIG. 5 is a perspective view of the same lighting device. FIG. 6 is a plan view showing a main part of the same lighting device. FIG. 7 is a perspective view of the lighting device according to the first modification of the embodiment. FIG. 8A is a plan view of the substrate and the light emitting portion of the same lighting device. FIG. 8B is a partially enlarged view of FIG. 8A.

The embodiments and modifications described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments and modifications, and various examples other than the embodiments and modifications can be made according to the design and the like as long as they do not deviate from the technical idea of the present disclosure. It can be changed. Each figure described in the following embodiments and modifications is a schematic view, and the ratio of the size and the thickness of each component in the figure does not necessarily reflect the actual dimensional ratio. ..

(Embodiment)
(1) Overall Configuration of Lighting Device The overall configuration of the lighting device 10 according to the present embodiment will be described below with reference to FIGS. 1, 2A, and 2B.

The lighting device 10 according to the present embodiment is, for example, a ceiling light fixed to the ceiling of a building. Specifically, the lighting device 10 is fixed to the ceiling by being attached to a hook ceiling fixed to the ceiling. In this embodiment, a case where the building is a detached house is illustrated. However, the building is not limited to a detached house, and may be, for example, each dwelling unit of an apartment house, or may be a non-house such as a factory, a hospital, or a tenant building.

The lighting device 10 according to the present embodiment includes a plurality of first light emitting elements 22 and a plurality of second light emitting elements 23. The plurality of first light emitting elements 22 irradiate the illumination space S1 (see FIG. 5) with light via the cover 3. The plurality of second light emitting elements 23 irradiate the illumination space S1 with light via the light guide member 4. That is, in the present embodiment, the first light emitting element 22 is a light emitting element for direct irradiation, and the second light emitting element 23 is a light emitting element for light guiding. The term "for direct irradiation" as used in the present disclosure includes a case where the light from the light emitting element is directly applied to the lighting space and a case where the light from the light emitting element is applied to the lighting space through a cover or the like. It does not include the case where the light from the element is applied to the illumination space through the light guide member. Further, the lighting space S1 is an indoor space in which the lighting device 10 is installed.

Each of the plurality of first light emitting elements 22 is located on the first virtual line L1 with a first interval D1 between them and the adjacent first light emitting element 22 in a plan view from one direction. .. Each of the plurality of second light emitting elements 23 is outside the first virtual line L1 in a plan view from one direction with a second interval D2 between them and the adjacent second light emitting element 23. It is located on the second virtual line L2. The third interval D3 between the first light emitting element 22 and the second light emitting element 23 in the direction in which the first virtual line L1 and the second virtual line L2 are lined up is a plurality of first light emitting elements 22 and a plurality of second light emitting elements. At least a part of the element 23 has a second interval D2 or more and is smaller than the first interval D1.

In the lighting device 10 according to the present embodiment, the plurality of first light emitting elements 22 and the plurality of second light emitting elements 23 are provided so that the third interval D3 is equal to or larger than the second interval D2 and smaller than the first interval D1. Have been placed. Therefore, when the cover 3 having light diffusivity is used, it is possible to realize desired light distribution characteristics while reducing the number of first light emitting elements 22.

(2) Each component of the lighting device Hereinafter, each component of the lighting device 10 according to the present embodiment will be described with reference to FIGS. 1 to 4B.

As shown in FIG. 1, the lighting device 10 according to the present embodiment includes a base 1, a light emitting unit 2, a cover 3, a light guide member 4, and a fixing member 5. Further, the lighting device 10 includes a reflecting member 6, a mounting member 7, a plurality of (four in FIG. 1) cushioning members 8, and packings 91 and 92.

(2.1) Base The base 1 includes a first member 11 and a second member 12, as shown in FIG. The first member 11 and the second member 12 are formed into a predetermined shape by, for example, pressing a sheet metal such as an aluminum plate or a steel plate.

The first member 11 is formed in a flat cylindrical shape with one surface (the surface on the second member 12 side) open. The first member 11 has a bottom wall portion 112 and a side wall portion 113. The side wall portion 113 of the first member 11 is inclined so that the opening diameter becomes larger as it approaches the second member 12. A circular through hole 111 is provided in the center of the bottom wall portion 112 of the first member 11.

The second member 12 is formed in a circular plate shape when viewed from the side of the first member 11. The outer diameter of the second member 12 is larger than the opening diameter of the first member 11. Therefore, in the state where the first member 11 and the second member 12 are combined, the (lower surface) opening of the first member 11 is closed by the second member 12. In the center of the second member 12, a circular recess 121 recessed on the side of the first member 11 is provided. The bottom wall portion 123 of the recess 121 is provided with a circular through hole 122. The opening diameter of the through hole 122 is smaller than the opening diameter of the through hole 111 of the first member 11.

(2.2) Light emitting unit The light emitting unit 2 includes a mounting substrate 21, a reflecting member 25, and an optical member 26, as shown in FIG.

The mounting board 21 is, for example, a printed wiring board made of glass epoxy resin. The mounting board 21 is formed in a rectangular plate shape when viewed from the base 1 side. A circular through hole 210 is provided in the center of the mounting board 21. The through hole 210 is formed to have a size through which the first member 71 of the mounting member 7, which will be described later, can be inserted. The mounting board 21 has a first surface 211 and a second surface 212. In the present embodiment, the first surface 211 is a surface (lower surface in FIG. 1) opposite to the base 1. Further, the second surface 212 is a surface on the base 1 side (upper surface in FIG. 1) and is a surface on the mounting substrate 21 opposite to the first surface 211.

As shown in FIG. 2A, a plurality of first light emitting elements 22 and a plurality of second light emitting elements 23 are mounted on the first surface 211 of the mounting substrate 21. In other words, the lighting device 10 further includes a mounting board 21 on which the first light emitting element 22 and the second light emitting element 23 are mounted. In the present embodiment, the first light emitting element 22 and the second light emitting element 23 are, for example, surface mount devices (SMD) type light emitting diodes (LEDs).

Further, as shown in FIG. 2A, a plurality of circuit elements 24 are mounted on the second surface 212 of the mounting board 21. The plurality of circuit elements 24 are, for example, elements constituting a power supply circuit 200 that generates lighting power of the plurality of first light emitting elements 22 and the plurality of second light emitting elements 23. In other words, the lighting device 10 further includes a power supply circuit 200 that generates lighting power of the plurality of first light emitting elements 22 and the plurality of second light emitting elements 23. The plurality of circuit elements 24 include a first circuit element 241 and a second circuit element 242 that is larger than the first circuit element 241.

The "second circuit element 242 larger than the first circuit element 241" in the present disclosure means that the second circuit element 242 has a larger cross-sectional area in the thickness direction of the mounting substrate 21 than the first circuit element 241. To say. That is, as shown in FIG. 2A, the circuit element having a relatively small cross-sectional area in the thickness direction of the mounting substrate 21 is the first circuit element 241 and the circuit element having a relatively large cross-sectional area is the second circuit element 242. Is. The first circuit element 241 is, for example, a resistor, a capacitor, or the like that constitutes a part of the power supply circuit 200. The second circuit element 242 is, for example, a transformer or the like that constitutes a part of the power supply circuit 200. The arrangement of the first light emitting element 22, the second light emitting element 23, and the circuit element 24 on the mounting substrate 21 will be described in the column of "(3) Arrangement of light emitting element and circuit element".

As shown in FIG. 1, the reflective member 25 is formed in a flat cylindrical shape having one surface (the surface on the mounting substrate 21 side) opened by pressing a sheet metal such as a steel plate. A circular through hole 251 is provided in the center of the bottom wall portion 253 of the reflective member 25. The through hole 251 is formed to have a size through which the first member 71 of the mounting member 7 can be inserted. Further, a rectangular through hole 252 is provided on the outer edge of the bottom wall portion 253 of the reflective member 25. The reflective member 25 is fixed to the mounting board 21 using, for example, a fixing screw. The side wall portion 254 and the bottom wall portion 253 of the reflecting member 25 reflect the light from the plurality of first light emitting elements 22 toward the illumination space S1 (see FIG. 5).

As shown in FIG. 1, the optical member 26 is formed in an annular shape by, for example, a light-transmitting synthetic resin such as an acrylic resin. The optical member 26 has a main body portion 261 and a plurality of (three in FIG. 1) lens portions 262. The plurality of lens portions 262 are provided at equal intervals along the circumferential direction of the main body portion 261. Each of the plurality of lens portions 262 projects hemispherically from one surface of the main body portion 261 (the surface opposite to the mounting substrate 21), and is formed to have a predetermined length along the circumferential direction of the main body portion 261. In a state where the optical member 26 is attached to the mounting substrate 21, the plurality of lens portions 262 and the plurality of first light emitting elements 22 face each other.

(2.3) Cover The cover 3 is made of a light-transmitting synthetic resin such as acrylic. As shown in FIGS. 1, 3A, and 3B, the cover 3 is formed in a flat cylindrical shape with one surface (the surface on the light guide member 4 side) open. The cover 3 has a main surface 31 and a side surface 32. The main surface 31 is formed in a circular shape when viewed from the light guide member 4 side (see FIG. 3A). The side surface 32 extends from the outer edge of the main surface 31 in a direction approaching the light guide member 4, and is inclined so that the opening diameter increases as the light guide member 4 approaches (see FIG. 3B).

Further, the cover 3 has a plurality of (four in FIG. 3A) cover-side fixing portions 33. The plurality of cover-side fixing portions 33 are provided at equal intervals along the circumferential direction of the main surface 31. Each of the plurality of cover-side fixing portions 33 has a rectangular plate shape when viewed from the thickness direction of the main surface 31, and is formed to a predetermined length along the circumferential direction of the main surface 31. Further, each cover-side fixing portion 33 has a groove 330 recessed in the radial direction of the main surface 31 when viewed from the thickness direction of the main surface 31. In the present embodiment, the cover 3 has light diffusivity due to the fine irregularities provided on the inner surfaces of the main surface 31 and the side surface 32. The material of the cover 3 is not limited to acrylic, and may be, for example, polycarbonate or the like.

(2.4) Light guide member The light guide member 4 is made of a light-transmitting synthetic resin such as acrylic. As shown in FIG. 1, the light guide member 4 has a light guide panel 41, a guide portion 42, and a plurality of mounting portions 43 (only two are shown in FIG. 1). The guide portion 42 is formed in a cylindrical shape so that the opening diameter gradually increases from one end (upper end of FIG. 1) to the other end (lower end of FIG. 1). The light guide panel 41 is formed in an annular shape. The light guide panel 41 is integrally formed with the guide portion 42 on the inner peripheral edge thereof. The plurality of mounting portions 43 are provided at equal intervals along the circumferential direction at the opening edge on one end side of the guide portion 42. Each of the plurality of mounting portions 43 has an insertion groove 430 formed in a semicircular shape. A fixing screw for fixing the fixing member 5 to the base 1 is inserted into the insertion groove 430.

In the state where the lighting device 10 is assembled (the state shown in FIG. 5), the end surface on one end side of the guide portion 42 of the light guide member 4 (hereinafter, also referred to as “first end surface”) is mounted on the mounting substrate 21. It faces a plurality of second light emitting elements 23. The light emitted from the plurality of second light emitting elements 23 enters the guide portion 42 from the first end surface, passes through the guide portion 42, and is guided to the light guide panel 41. The light guided to the light guide panel 41 is emitted to the outside from the main surface (upper surface 411 and lower surface 412 in FIG. 1) of the light guide panel 41.

(2.5) Fixing member The fixing member 5 is formed of, for example, a synthetic resin such as polycarbonate. As shown in FIGS. 1, 4A, and 4B, the fixing member 5 has a cylindrical shape in which the opening diameter gradually increases from one end (upper end of FIG. 1) to the other end (lower end of FIG. 1). It is formed. The fixing member 5 has a base portion 50 and a plurality of (three in FIG. 4A) member fixing portions 51. The plurality of member fixing portions 51 are provided at equal intervals along the circumferential direction at the opening edge on one end side of the base portion 50. Each of the plurality of member fixing portions 51 has a semicircular insertion groove 510. A fixing screw for fixing the fixing member 5 to the base 1 is inserted into the insertion groove 510. In other words, the fixing member 5 has a member fixing portion 51 for fixing the fixing member 5 to the base 1.

The fixing member 5 further has a plurality of (two in FIG. 4B) cover fixing portions 52. The plurality of cover fixing portions 52 are provided at equal intervals along the circumferential direction at the outer edge of the other end side of the base portion 50. Each of the plurality of cover fixing portions 52 has a plate-shaped bending piece 520 extending along the circumferential direction of the base portion 50. At the tip of the flexible piece 520, a protrusion 521 formed in a triangular shape in a plan view is integrally formed. The bending piece 520 can bend in the radial direction of the base 50.

Further, the fixing member 5 further has a plurality of guide pieces 53 (four in FIG. 4B). The plurality of guide pieces 53 are provided at equal intervals along the circumferential direction at the outer edge of the other end side of the base 50. Each of the plurality of guide pieces 53 is formed to a predetermined length along the circumferential direction of the base 50. As shown in FIG. 4B, two guide pieces 53 out of the plurality of guide pieces 53 are connected to the above-mentioned two cover fixing portions 52. Further, a groove 54 is provided between two adjacent guide pieces 53 among the plurality of guide pieces 53. In the present embodiment, the fixing member 5 has a plurality of (four in FIG. 4B) grooves 54.

Here, a case where the cover 3 is attached to the fixing member 5 will be briefly described. First, the cover 3 is combined with the fixing member 5 with the opening side of the cover 3 facing the fixing member 5. At this time, in the direction in which the cover 3 and the fixing member 5 are lined up, the positions of the plurality of cover-side fixing portions 33 and the positions of the plurality of grooves 54 are aligned. From this state, when the cover 3 is rotated in one direction with respect to the fixing member 5, each of the plurality of cover-side fixing portions 33 moves along the corresponding guide piece 53. Then, when the cover 3 is rotated to a predetermined position with respect to the fixing member 5, the cover 3 is attached to the fixing member 5. At this time, two of the cover-side fixing portions 33 out of the plurality of cover-side fixing portions 33 move while contacting the protrusion 521 of the flexible piece 520, and when the cover 3 reaches the predetermined position, the cover-side fixing portion 33 The protrusion 521 is inserted into the groove 330 of the.

The material of the fixing member 5 is not limited to polycarbonate, and may be, for example, ABS (Acrylonitrile Butadiene Styrene) or the like.

(2.6) Reflective member As shown in FIG. 1, the reflective member 6 is formed in a ring shape by, for example, a synthetic resin such as polystyrene. The reflective member 6 has a reflective portion 61 and a side wall portion 62. The reflective portion 61 is formed in a cylindrical shape so that the opening diameter gradually increases from one end (upper end of FIG. 1) to the other end (lower end of FIG. 1). The reflective portion 61 has a plurality of (three in FIG. 1) mounting portions 63. The plurality of mounting portions 63 are provided at equal intervals along the circumferential direction of the reflecting portion 61. The reflective member 6 is attached to the base 1 via a plurality of attachment portions 63. The side wall portion 62 extends from the opening edge on the other end side of the reflecting portion 61, and is inclined so that the opening diameter increases as the distance from the light guide member 4 increases. The reflective member 6 is configured such that the reflective portion 61 functions as a reflective surface.

In the state where the lighting device 10 is assembled (the state shown in FIG. 5), the guide portion 42 of the light guide member 4 and the reflection portion 61 of the reflection member 6 face each other. The reflecting unit 61 reflects the light leaking from the guide unit 42 to the outside of the light passing through the guide unit 42 toward the guide unit 42.

(2.7) Mounting member As shown in FIG. 1, the mounting member 7 includes a first member 71 and a second member 72. The first member 71 is made of, for example, a synthetic resin such as polypropylene. The first member 71 has a tubular portion 711 and a flange portion 712. The tubular portion 711 is formed in a cylindrical shape with both ends (upper and lower ends in FIG. 1) open. The flange portion 712 projects outward from the opening edge on the one end (upper end in FIG. 1) side of the tubular portion 711 over the entire circumference.

The second member 72 is formed of, for example, a synthetic resin such as polybutylene terephthalate. The second member 72 has a tubular portion 721 and a flange portion 722. The tubular portion 721 is formed in a cylindrical shape with one end (lower end in FIG. 1) open. The flange portion 722 projects outward from the other end (upper end in FIG. 1) of the tubular portion 721 over the entire circumference. The outer diameter of the tubular portion 721 is smaller than the inner diameter of the tubular portion 711, and in a state where the first member 71 and the second member 72 are combined, the tubular portion 721 is inserted into the tubular portion 711.

The mounting member 7 is electrically and mechanically connected to the hook ceiling by being attached to an adapter attached to the hook ceiling fixed to the ceiling.

The material of the first member 71 is not limited to polypropylene, and may be, for example, ABS or the like. Further, the material of the second member 72 is not limited to polybutylene terephthalate, and may be, for example, silicone or the like.

(2.8) Cushioning member Each of the plurality of (four in FIG. 1) cushioning members 8 is formed of, for example, a synthetic resin such as polyurethane. Each of the plurality of cushioning members 8 is formed in an arc shape in a plan view. The first end face and the second end face in the longitudinal direction of each cushioning member 8 are inclined at different angles from each other. The angle formed by the first end surface and the second end surface is, for example, 90 degrees. The plurality of cushioning members 8 are arranged adjacent to each other so as to form an annular shape.

(2.9) Packing As shown in FIG. 1, the packings 91 and 92 are formed in a ring shape by, for example, a synthetic resin such as a silicone resin. The packing 91 is arranged between the light guide member 4 and the reflective member 6, and seals the gap between the light guide member 4 and the reflective member 6. The packing 92 is arranged between the cover 3 and the fixing member 5, and seals the gap between the cover 3 and the fixing member 5.

(3) Arrangement of light emitting elements and circuit elements Next, with reference to FIGS. 2A, 2B, and 6 regarding the arrangement of the first light emitting element 22, the second light emitting element 23, and the circuit element 24 on the mounting substrate 21. I will explain. 2A is a plan view of the mounting board 21, and FIG. 2B is a partially enlarged view of FIG. 2A. Further, FIG. 6 is a plan view showing the positional relationship between the mounting board 21 and the fixing member 5 in a state where the lighting device 10 is assembled. In FIG. 6, the mounting board 21 is shown by a solid line, and the fixing member 5 is shown by a two-dot chain line.

As shown in FIG. 2A, the plurality of first light emitting elements 22 are located on the first virtual line L1 in a plan view from one direction (direction perpendicular to the paper surface of FIG. 2A). Further, as shown in FIG. 2B, each of the plurality of first light emitting elements 22 has a distance D1 from the adjacent first light emitting element 22 in a plan view from one direction. As shown in FIG. 2A, the plurality of second light emitting elements 23 are located on the second virtual line L2 in a plan view from one direction. Further, as shown in FIG. 2B, each of the plurality of second light emitting elements 23 has a second distance D2 at a distance from the adjacent second light emitting element 23 in a plan view from one direction.

In the present embodiment, the first virtual line L1 and the second virtual line L2 are curves, respectively. Specifically, the first virtual line L1 is the circumference of the first circle having a radius r1, and the second virtual line L2 is the circumference of the second circle having a radius r2 (r2> r1). Further, the center P1 of the first circle and the center P2 of the second circle coincide with each other, and the first circle and the second circle are concentric circles. That is, in the lighting device 10 according to the present embodiment, the plurality of second light emitting elements 23 are located outside the plurality of first light emitting elements 22.

Further, as shown in FIG. 6, the plurality of first light emitting elements 22 are inside the cover fixing portion 52 of the fixing member 5 in a plan view from one direction (direction perpendicular to the paper surface of FIG. 6). It is mounted in the element mounting area R1. The element mounting area R1 includes a plurality of (three in FIG. 6) first mounting areas R11 and a plurality of (three in FIG. 6) non-mounting areas R12. In the element mounting region R1, the plurality of first mounting regions R11 and the plurality of non-mounting regions R12 are alternately arranged so as to form an annular shape. The plurality of first light emitting elements 22 are mounted in the plurality of first mounting areas R11 in the element mounting area R1. That is, the non-mounting region R12 is a region in which the first light emitting element 22 is not mounted. In the assembled state of the lighting device 10, as shown in FIG. 6, the member fixing portion 51 of the fixing member 5 is arranged in the non-mounting region R12 in a plan view from one direction. In other words, the member fixing portion 51 is arranged in the non-mounting region R12 of the element mounting region R1 in which the first light emitting element 22 is not mounted, with the fixing member 5 attached to the base 1. According to this configuration, the member fixing portion 51 can be arranged by utilizing the dead space (non-mounting region R12) in which the first light emitting element 22 is not arranged.

Further, as shown in FIGS. 2A and 6, the plurality of second light emitting elements 23 are inside the cover fixing portion 52 of the fixing member 5 and in the element mounting region R1 in a plan view from one direction. It is mounted in the second mounting area R2 outside the area.

Here, the plurality of circuit elements 24 include the first circuit element 241 and the second circuit element 242, as described above. In the lighting device 10 according to the present embodiment, as shown in FIG. 2A, the first circuit element 241 and the second circuit element 242 are mounted on the second surface 212 (the surface opposite to the first surface 211) of the mounting board 21. It has been implemented. More specifically, the first circuit element 241 and the second circuit element 242 are viewed from the thickness direction of the mounting board 21 (direction perpendicular to the paper surface of FIG. 2A) of the second surface 212 of the mounting board 21. It is mounted in a non-overlapping region R3 that does not overlap with the first light emitting element 22 and the second light emitting element 23. In the present embodiment, the non-overlapping region R3 is a region outside the through hole 210 and inside the element mounting region R1 in the second surface 212 of the mounting substrate 21. By mounting the plurality of first circuit elements 241 and the second circuit element 242 in the non-overlapping region R3 in this way, the first circuit element 241 and the first circuit element 241 and the second are generated by the heat generated by the first light emitting element 22 and the second light emitting element 23. The influence on the two circuit elements 242 can be reduced.

By the way, in the lighting device 10 according to the present embodiment, in at least a part of the plurality of first light emitting elements 22 and the plurality of second light emitting elements 23, the third interval D3 (see FIG. 2B) is the second interval D2 or more. And is preferably smaller than the first interval D1. The third interval D3 is the interval between the first light emitting element 22 and the second light emitting element 23 in the direction in which the first virtual line L1 and the second virtual line L2 are lined up. In the present embodiment, in all the first light emitting elements 22 and all the second light emitting elements 23, the third interval D3 is equal to or larger than the second interval D2 and smaller than the first interval D1. According to this configuration, by using the cover 3 having light diffusivity, it is possible to realize desired light distribution characteristics while reducing the number of first light emitting elements 22.

Here, the first interval D1 is preferably, for example, 3 mm or more and 9 mm or less. More preferably, the first interval D1 is 4.62 mm or more and 6.71 mm or less. Further, the second interval D2 is preferably 2 mm or more and 8 mm or less. More preferably, the second interval D2 is 4.62 mm or more and 6.71 mm or less. Further, the third interval D3 is preferably 2 mm or more and less than 9 mm. More preferably, it is 5.15 mm. Further, the ratio of the third interval D3 to the second interval D2 is preferably 1 or more and 1.5 or less. According to this configuration, the lighting device 10 can be miniaturized as compared with the case where the ratio is larger than 1.5.

As described above, in the lighting device 10 according to the present embodiment, the plurality of first light emitting elements 22 and the plurality of first light emitting elements 22 so that the third interval D3 is equal to or larger than the second interval D2 and smaller than the first interval D1. The second light emitting element 23 is arranged. Therefore, when the cover 3 having light diffusivity is used, it is possible to realize desired light distribution characteristics while reducing the number of first light emitting elements 22.

(4) Modifications The above embodiment is only one of the various embodiments of the present disclosure. The above-described embodiment can be variously modified depending on the design and the like as long as the object of the present disclosure can be achieved. Hereinafter, modified examples of the above-described embodiment will be listed. The modifications described below can be applied in combination as appropriate.

(4.1) Modification 1
In the above-described embodiment, the lighting device 10 is a round ceiling light, but as shown in FIG. 7, the lighting device 10A may be a square ceiling light. Hereinafter, the lighting device 10A according to the first modification will be described with reference to FIGS. 7, 8A, and 8B.

As shown in FIG. 7, the lighting device 10A according to the first modification includes a base 1A, a light emitting unit 2A (see FIG. 8A), a cover 3A, a light guide member 4A, and a fixing member. .. Further, the lighting device 10A includes a reflection member, a mounting member, a plurality of cushioning members 8A (only one is shown in FIG. 7), and a packing. The lighting device 10A according to the first modification is the same as the lighting device 10 according to the above-described embodiment, except that the base 1A, the cover 3A, the light guide member 4A, and the like have a square shape. , A detailed description is omitted here.

As shown in FIG. 8A, the light emitting unit 2A has a plurality of (two in FIG. 8A) mounting substrates 21A. Each of the plurality of mounting boards 21A is formed in the shape of a long rectangular plate in one direction (left-right direction in FIG. 8A). A plurality of first light emitting elements 22 and a plurality of second light emitting elements 23 are mounted on the first surface 211A of each mounting substrate 21A. A plurality of circuit elements are mounted on the second surface of each mounting board 21A (the surface of the mounting board 21A opposite to the first surface 211A).

As shown in FIG. 8A, the plurality of first light emitting elements 22 are mounted in the first mounting region R11. As shown in FIG. 8A, the plurality of second light emitting elements 23 are mounted in the second mounting region R2. The second mounting region R2 is a region along the longitudinal direction of the mounting board 21 at both ends in the width direction of the mounting board 21. The first mounting area R11 is an area between two second mounting areas R2 located at both ends in the width direction of the mounting board 21.

Each of the plurality of second light emitting elements 23 has a second interval D2 between them and the adjacent second light emitting element 23 in a plan view from one direction (direction perpendicular to the paper surface of FIG. 8A). , Located on the second virtual line L2. Further, among the plurality of first light emitting elements 22, each of the plurality of first light emitting elements 22 (hereinafter, also referred to as “first light emitting element 22A”) adjacent to the plurality of second light emitting elements 23 is adjacent to each other. It is located on the first virtual line L1 with a first interval D1 between it and the first light emitting element 22A. In the first modification, the first virtual line L1 and the second virtual line L2 are straight lines (line segments), respectively.

It is preferable that the third interval D3 is equal to or greater than the second interval D2 and smaller than the first interval D1 in at least a part of the plurality of first light emitting elements 22A and the plurality of second light emitting elements 23. .. In the first modification, as shown in FIG. 8A, in a part of the plurality of first light emitting elements 22A and the plurality of second light emitting elements 23, the third interval D3 is equal to or greater than the second interval D2, and the first interval D1. Is also getting smaller. According to this configuration, by using the cover 3A having light diffusivity, it is possible to realize desired light distribution characteristics while reducing the number of first light emitting elements 22A.

In the first modification, in a part of the plurality of first light emitting elements 22A and the plurality of second light emitting elements 23, the third interval D3 was equal to or larger than the second interval D2 and smaller than the first interval D1. .. On the other hand, in all the first light emitting elements 22A and all the second light emitting elements 23, the third interval D3 may be the second interval D2 or more and smaller than the first interval D1.

(4.2) Other variants The following is a list of other variants.

In the above-described embodiment and modification 1, the lighting devices 10 and 10A are ceiling-mounted ceiling lights, but the lighting devices 10 and 10A are not limited to ceiling lights, and may be, for example, an embedded lighting device. good.

In the above-described embodiment, the cover 3 has light diffusivity, but the cover 3 may have at least light transmittance and may not have light diffusivity.

In the above-described embodiment, the first circuit element 241 and the second circuit element 242 are mounted in the non-overlapping region R3, but at least the second circuit element 242 may be mounted in the non-overlapping region R3. That is, the first circuit element 241 may be mounted in a region overlapping with the first light emitting element 22 or the second light emitting element 23.

In the above-described embodiment, in all the first light emitting elements 22 and all the second light emitting elements 23, the third interval D3 is equal to or larger than the second interval D2 and smaller than the first interval D1. On the other hand, in a part of the plurality of first light emitting elements 22 and the plurality of second light emitting elements 23, the third interval D3 may be the second interval D2 or more and smaller than the first interval D1. ..

In the above-described embodiment, the plurality of second circuit elements 242 are mounted on the second surface 212 of the mounting board 21. On the other hand, if the plurality of second circuit elements 242 are arranged at positions that do not overlap with the plurality of first light emitting elements 22 and the plurality of second light emitting elements 23 when viewed from the thickness direction of the mounting substrate 21. , May be mounted on the first surface 211 of the mounting board 21.

(summary)
As described above, the lighting device (10; 10A) according to the first aspect includes a plurality of first light emitting elements (22; 22A) and a plurality of second light emitting elements (23). The plurality of first light emitting elements (22; 22A) irradiate the illumination space (S1) with light via the cover (3; 3A). The plurality of second light emitting elements (23) irradiate the illumination space (S1) with light via the light guide member (4; 4A). Each of the plurality of first light emitting elements (22; 22A) is in a state where a first interval (D1) is provided between the plurality of first light emitting elements (22; 22A) and the adjacent first light emitting elements (22; 22A) in a plan view from one direction. , Located on the first virtual line (L1). Each of the plurality of second light emitting elements (23) has a second space (D2) between it and the adjacent second light emitting element (23) in a plan view from one direction, and the first virtual element is provided. It is located on the second virtual line (L2) outside the line (L1). There are a plurality of third intervals (D3) between the first light emitting element (22; 22A) and the second light emitting element (23) in the direction in which the first virtual line (L1) and the second virtual line (L2) are lined up. In at least a part of the first light emitting element (22; 22A) and the plurality of second light emitting elements (23), the distance is equal to or greater than the second interval (D2) and smaller than the first interval (D1).

According to this aspect, the first light emitting element (22; 22A) and the second light emitting element so that the third interval (D3) is equal to or larger than the second interval (D2) and smaller than the first interval (D1). (23) is arranged. Therefore, when a cover (3; 3A) having light diffusivity is used, it is possible to realize desired light distribution characteristics while reducing the number of first light emitting elements (22; 22A).

The lighting device (10; 10A) according to the second aspect is a mounting substrate (21) provided with a plurality of first light emitting elements (22; 22A) and a plurality of second light emitting elements (23) in the first aspect. 21A) is further provided.

According to this aspect, the lighting device (10; 10A) is compared with the case where the plurality of first light emitting elements (22; 22A) and the plurality of second light emitting elements (23) are mounted on separate substrates. Can be miniaturized.

The lighting device (10; 10A) according to the third aspect is a power supply circuit that generates lighting power of a plurality of first light emitting elements (22; 22A) and a plurality of second light emitting elements (23) in the second aspect. (200) is further provided. The power supply circuit (200) has a plurality of circuit elements (24). A plurality of circuit elements (24) are mounted on a mounting board (21; 21A).

According to this aspect, the lighting device (10;) is compared with the case where the first light emitting element (22; 22A) and the second light emitting element (23) and the circuit element (24) are mounted on separate substrates. 10A) can be made thinner.

In the lighting device (10; 10A) according to the fourth aspect, in the third aspect, the mounting substrate (21; 21A) is opposite to the first surface (211; 211A) and the first surface (211; 211A). It has a second surface (212) on the side. The plurality of first light emitting elements (22; 22A) and the plurality of second light emitting elements (23) are mounted on the first surface (211; 211A). The plurality of circuit elements (24) are mounted on the second surface (212).

According to this aspect, it is possible to reduce the influence of the circuit element (24) on the light distribution of the first light emitting element (22; 22A) and the second light emitting element (23).

In the lighting device (10; 10A) according to the fifth aspect, in the third or fourth aspect, the plurality of circuit elements (24) are more than the first circuit element (241) and the first circuit element (241). Includes a large second circuit element (242). The second circuit element (242) includes a plurality of first light emitting elements (22; 22A) and a plurality of second light emitting elements (22; 22A) in the mounting substrate (21; 21A) when viewed from the thickness direction of the mounting substrate (21; 21A). It is mounted in a non-overlapping region (R3) that does not overlap with the light emitting element (23).

According to this aspect, the influence of heat from the first light emitting element (22; 22A) and the second light emitting element (23) to the second circuit element (242) can be reduced.

In the lighting device (10; 10A) according to the sixth aspect, in any one of the first to fifth aspects, the ratio of the third interval (D3) to the second interval (D2) is 1 or more, and 1. It is 5 or less.

According to this aspect, the lighting device (10; 10A) can be miniaturized.

The configuration according to the second to sixth aspects is not an essential configuration for the lighting device (10; 10A) and can be omitted as appropriate.

3,3A Cover 4,4A Light guide member 10,10A Lighting device 21,21A Mounting board 22, 22A First light emitting element 23 Second light emitting element 24 Circuit element 200 Power supply circuit 211, 211A First surface 212 Second surface 241 First 1 circuit element 242 2nd circuit element D1 1st interval D2 2nd interval D3 3rd interval L1 1st virtual line L2 2nd virtual line S1 Illumination space

Claims (6)

A plurality of first light emitting elements that irradiate the lighting space with light through the cover,
A plurality of second light emitting elements that irradiate the illumination space with light via a light guide member are provided.
Each of the plurality of first light emitting elements is located on the first virtual line with a first distance from the adjacent first light emitting element in a plan view from one direction.
Each of the plurality of second light emitting elements has a second distance from the adjacent second light emitting element in a plan view from the one direction, and is outside the first virtual line. 2 Located on a virtual line,
The third distance between the first light emitting element and the second light emitting element in the direction in which the first virtual line and the second virtual line are lined up is the plurality of first light emitting elements and the plurality of second light emitting elements. At least a part of the elements is equal to or larger than the second interval and smaller than the first interval.
Lighting equipment. Further, a mounting substrate provided with the plurality of first light emitting elements and the plurality of second light emitting elements is provided.
The lighting device according to claim 1. Further, a power supply circuit for generating lighting power of the plurality of first light emitting elements and the plurality of second light emitting elements is provided.
The power supply circuit has a plurality of circuit elements and has a plurality of circuit elements.
The plurality of circuit elements are mounted on the mounting board.
The lighting device according to claim 2. The mounting board is
The first side and
It has a second surface opposite to the first surface.
The plurality of first light emitting elements and the plurality of second light emitting elements are mounted on the first surface.
The plurality of circuit elements are mounted on the second surface.
The lighting device according to claim 3. The plurality of circuit elements are
The first circuit element and
Includes a second circuit element that is larger than the first circuit element.
The second circuit element is mounted in a non-overlapping region of the mounting board that does not overlap with the plurality of first light emitting elements and the plurality of second light emitting elements when viewed from the thickness direction of the mounting board. ,
The lighting device according to claim 3 or 4. The ratio of the third interval to the second interval is 1 or more and 1.5 or less.
The lighting device according to any one of claims 1 to 5.

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