Lighting fixtures

Abstract

To realize a lighting apparatus with high heat radiation property.SOLUTION: A lighting apparatus 100 comprises an apparatus body 110, a light emitting module 10 having a substrate 11 mounted to the apparatus body 110 and a plurality of light emitting elements 21 arranged on a main face 11a of the substrate 11, and an optical member 60 arranged on the main face 11a side of the light emitting module 10. The optical member 60 includes a plurality of housing parts 62 corresponding to the plurality of light emitting elements 21 one by one and serving as a space for housing the corresponding light emitting element 21, a plurality of lenses 61 corresponding to the plural light emitting elements 21 one by one and radiating light from the corresponding light emitting element 21 under a predetermined light distribution state, and a communication part 63 serving as a space for communicating two adjacent housing parts 62 among the plurality of housing parts 62.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a lighting fixture. [Background technology]

[0002] Conventionally, ceiling lights, which are lighting fixtures attached to a ceiling surface, are known. For example, a ceiling light disclosed in Patent Document 1 includes a housing, a light source board on which a plurality of LEDs (Light Emitting Diodes) are provided, and an optical member that covers the LEDs. The optical member has a light distribution characteristic that spreads the light emitted from the LEDs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-46067 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional ceiling lights described above are insufficient in dissipating heat generated by the LEDs when they emit light.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a lighting fixture with high heat dissipation properties. [Means for solving the problem]

[0006] A lighting device according to one aspect of the present invention includes a device body, a light-emitting module having a substrate attached to the device body and a plurality of light-emitting elements arranged on a main surface of the substrate, and an optical member arranged on the main surface side of the light-emitting module. The optical member includes a plurality of storage sections each having a one-to-one correspondence with the plurality of light-emitting elements and being a space for storing the corresponding light-emitting elements, a plurality of lenses each having a one-to-one correspondence with the plurality of light-emitting elements and for emitting light from the corresponding light-emitting elements in a predetermined light distribution state, and a first communication section which is a space communicating between two adjacent storage sections among the plurality of storage sections. Effect of the Invention

[0007] According to the present invention, a lighting fixture with high heat dissipation properties can be realized. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an external appearance of a lighting fixture according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the lighting fixture according to the embodiment. [Diagram 3] FIG. 3 is a perspective view showing a structural relationship between the light emitting module and optical members according to the embodiment. [Figure 4] FIG. 4 is a plan view of the light emitting module according to the embodiment. [Diagram 5] FIG. 5 is a plan view showing each region of the light emitting module according to the embodiment. [Figure 6] FIG. 6 is an enlarged plan view of region VI in FIG. [Figure 7] FIG. 7 is a plan view of an optical member according to an embodiment. [Figure 8] FIG. 8 corresponds to region VI in FIG. 4 and is an enlarged plan view of the optical member according to the embodiment as viewed from the light emitting module side. [Figure 9] FIG. 9 is a perspective view of a part of the optical member according to the embodiment as viewed from the light emitting module side. [Figure 10]FIG. 10 is an end view of the lighting fixture when cut at the position indicated by the line XX in FIG. [Figure 11] FIG. 11 is a diagram showing a lamp image of a lighting fixture according to the embodiment. [Figure 12] FIG. 12 is an end view of a lighting fixture according to the first modification of the embodiment. [Figure 13] FIG. 13 is a plan view of an optical member of an illumination device according to the second modification of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the following, a lighting device according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection of the components, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not described in the independent claims will be described as optional components.

[0010] In addition, each figure is a schematic diagram and is not necessarily illustrated precisely. Therefore, for example, the scales in each figure do not necessarily match. In addition, in each figure, substantially the same configurations are given the same reference numerals, and duplicated explanations are omitted or simplified.

[0011] Furthermore, in this specification, terms indicating the relationship between elements, such as parallel and orthogonal, terms indicating the shape of elements, such as circular or rectangular, and numerical ranges are not expressions that only express a strict meaning, but are expressions that include a substantially equivalent range, for example, a difference of about a few percent.

[0012] In this specification and the drawings, the X-axis, the Y-axis, and the Z-axis represent the three axes of a three-dimensional orthogonal coordinate system.

[0013] In this specification, unless otherwise specified, "plan view" means viewing the main surface of the substrate of the light emitting module from the front. The Z axis is defined to coincide with the normal line of the main surface of the substrate. Therefore, "plan view" means viewing from the Z axis direction (specifically, the Z axis positive direction).

[0014] In addition, in this specification, ordinal numbers such as "first" and "second" do not refer to the number or order of components, unless otherwise specified, but are used for the purpose of avoiding confusion between and distinguishing between components of the same type.

[0015] (Embodiment) [Overall configuration of lighting fixtures] First, the overall configuration of a lighting fixture 100 according to an embodiment will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing the external appearance of lighting fixture 100 according to an embodiment. Figure 2 is an exploded perspective view of lighting fixture 100 according to an embodiment. The upward direction (positive direction of the Z axis) in Figures 1 and 2 corresponds to the direction of a floor surface (not shown) facing ceiling 4. In other words, lighting fixture 100 in Figures 1 and 2 is shown upside down from its normal use. The same applies to Figures 3, 10, and 12 described below.

[0016] The lighting fixture 100 of this embodiment is, for example, a ceiling light attached to a ceiling 4. As shown in Fig. 2, the lighting fixture 100 includes a fixture body 110 and a light-emitting module 10 attached to the fixture body 110.

[0017] The light-emitting module 10 includes a substrate 11 and a plurality of light-emitting elements 21 arranged on a main surface 11a of the substrate 11. In the present embodiment, a plurality of circuit components 81 are further arranged on the main surface 11a of the substrate 11. The plurality of circuit components 81 constitute a power supply circuit 80.

[0018] The lighting fixture 100 further includes a reflective sheet 40 disposed along the light-emitting module 10, a circuit cover 50, an optical member 60 having a plurality of lenses 61, a lighting cover 70, and a fixture mounting portion 90. A decorative plate 71 is attached to the outer periphery of the lighting cover 70.

[0019] [Fixture body and fixture mounting part] The fixture body 110 is a main body of the lighting fixture 100. The fixture body 110 has a circular outer shape in a plan view. As shown in Fig. 2, the fixture body 110 is a disk-shaped member made of sheet metal such as an aluminum plate or a steel plate. For example, a white paint having high light reflectance is applied or a reflective metal material is vapor-deposited on the surface of the fixture body 110 on which the light-emitting module 10 and the like are arranged.

[0020] A circular opening is formed in the center of the fixture body 110. A substantially cylindrical support part 119 is disposed extending from the periphery of the opening towards the light emitting module 10. The support part 119 is a member formed of, for example, resin, and has a structure that allows it to be fitted into the fixture attachment part 90.

[0021] The fixture attachment part 90 is an example of an attachment member disposed in the center of the fixture main body 110. The fixture attachment part 90 is detachably attached to a ceiling-side attachment member 9 installed on the ceiling 4. In other words, the fixture main body 110 is detachably attached to the ceiling 4 via the fixture attachment part 90.

[0022] In the fixture body 110, a step portion 118 is formed around the support portion 119, and a mounting surface portion 112 is formed further outside the step portion 118. The mounting surface portion 112 has a circular outer shape in a plan view. The substrate 11 of the light-emitting module 10 is mounted on the mounting surface portion 112. A peripheral portion 113 that protrudes in the positive direction of the Z axis from the mounting surface portion 112 is formed around the mounting surface portion 112. When the light-emitting module 10 is attached to the fixture body 110, the rear surface 11b of the substrate 11 contacts the mounting surface portion 112, and the leads of the circuit component 81 protruding from the rear surface 11b of the substrate 11 are housed in the space within the step portion 118.

[0023] [Light emitting module] 2, the light emitting module 10 includes a substrate 11, a plurality of light emitting elements 21 arranged on a main surface 11a of the substrate 11, and a plurality of circuit components 81 arranged on the substrate 11. The substrate 11 is a so-called printed circuit board on which metal wiring is patterned, and in this embodiment, a resin substrate having a conductor pattern (metal wiring) on ​​one side is used as the substrate 11. The surface of the substrate 11 on which the conductor pattern is formed is referred to as the main surface 11a, and the surface opposite to the main surface 11a is referred to as the back surface 11b. Examples of such substrates include a glass epoxy substrate and a composite substrate epoxy resin substrate (CEM-3), etc.

[0024] Each of the light-emitting elements 21 in this embodiment is, for example, an LED element in which an LED chip is packaged. That is, the mounting structure of the light-emitting module 10 is an SMD (Surface Mount Device) structure in which an LED element in which an LED chip is packaged is mounted on the main surface 11a of the substrate 11.

[0025] The plurality of light-emitting elements 21 include two or more types of light-emitting elements that emit light with different color temperatures. The plurality of light-emitting elements 21 include, for example, a light-emitting element with a high color temperature (e.g., 6500K) and a light-emitting element with a low color temperature (e.g., 2700K). The light emission of the light-emitting element with the high color temperature and the light-emitting element with the low color temperature are controlled independently. This enables dimming and color adjustment.

[0026] The multiple light-emitting elements 21 are connected in series, for example, with each light-emitting element being of the same type. Alternatively, multiple groups (light-emitting element groups) of n (n is an integer of 2 or more) light-emitting elements 21 connected in series may be formed, and these multiple light-emitting element groups may be connected in parallel. Note that all of the multiple light-emitting elements 21 may be light-emitting elements of the same type. The specific configuration of the light-emitting module 10, such as the shape of the substrate 11 and the arrangement of the light-emitting elements 21, will be described later.

[0027] A plurality of circuit components 81 are arranged in a region (circuit region 14 shown in FIG. 5) in the central portion (peripheral portion of the opening 12) of the substrate 11 in a plan view, and these plurality of circuit components 81 constitute a power supply circuit 80 that supplies power for light emission to the plurality of light-emitting elements 21. The power supply circuit 80 converts AC power supplied via a cable (not shown) extending from the fixture body 110, for example, into DC power suitable for the light emission of the plurality of light-emitting elements 21 and supplies the converted power. As a result, the plurality of light-emitting elements 21 (light-emitting section 20) emit light. Each of the plurality of circuit components 81 that constitute the power supply circuit 80 is, for example, a capacitance element such as an electrolytic capacitor or a ceramic capacitor, a resistance element, a coil element, a choke coil (choke transformer), a noise filter, and a semiconductor element such as a diode or an integrated circuit element.

[0028] In this manner, the power supply circuit 80 and the ring-shaped light-emitting unit 20 are arranged on the main surface 11a of the substrate 11 so as to surround the power supply circuit 80. In this embodiment, the night light 30 is further arranged on the main surface 11a of the substrate 11 between the power supply circuit 80 and the light-emitting unit 20. The night light 30 is, for example, an LED element having a similar configuration to the light-emitting element 21. The color temperature of the light emitted by the night light 30 is, for example, an incandescent light, but may also be a daylight light. A bullet-shaped LED may also be used as the night light 30. An insulating cover 45 shown in FIG. 2 and a part of the optical member 60 described later are arranged on the front side (the Z-axis positive direction side) of the night light 30.

[0029] [Reflective sheet] The reflective sheet 40 is disposed between the light emitting module 10 and the optical member 60. The reflective sheet 40 reflects light that travels directly or indirectly from the multiple light emitting elements 21 toward the reflective sheet 40. A specific configuration of the reflective sheet 40 will be described later.

[0030] [Circuit cover] The circuit cover 50 is a member that covers a plurality of circuit components 81 (power supply circuits 80) arranged on the substrate 11. In this embodiment, the circuit cover 50 is made of a metal such as iron or aluminum, and is non-flammable. An insulating sheet made of, for example, resin may be arranged on the inner surface of the circuit cover 50. This allows the inner surface of the circuit cover 50 to be closer to the circuit components 81 inside the circuit cover 50, and as a result, the height (width in the Z-axis direction) of the circuit cover 50 can be reduced. Furthermore, the circuit cover 50 may be made of, for example, a flame-retardant resin instead of a metal. This allows, for example, the circuit cover 50 to be made smaller or lighter.

[0031] In this embodiment, the circuit cover 50 is attached to the fixture body 110 together with the optical member 60 and the light emitting module 10 by, for example, a plurality of screws (not shown).

[0032] [Optical components] 2, the optical member 60 is a light-emitting unit cover that covers the light-emitting unit 20 of the light-emitting module 10. The optical member 60 is formed using a translucent (e.g., transparent) resin material such as a transparent acrylic resin. In a plan view, the optical member 60 has a circular outer shape with a hole (opening 64) in the center, that is, has a shape generally called a doughnut shape.

[0033] The optical member 60 has a plurality of lenses 61. The plurality of lenses 61 are provided in one-to-one correspondence with the plurality of light-emitting elements 21. The lenses 61, for example, expand the light distribution angle of the light from the corresponding light-emitting element 21. That is, the lenses 61 have a function of diverging light. In this manner, by arranging the lenses 61 in correspondence with each of the light-emitting elements 21, for example, it is possible to precisely control the diffusion of light from each of the plurality of light-emitting elements 21. The specific shapes of the plurality of lenses 61 will be described later with reference to Figs. 7 to 10.

[0034] [Lighting cover] The lighting cover 70 is an example of a diffusion cover, and is attached to the fixture body 110 to cover the main surface 11a of the light-emitting module 10. Specifically, the lighting cover 70 is a member that covers the side of the fixture body 110 on which the light-emitting module 10 and the like are attached, and is made of a translucent resin. The lighting cover 70 is also called a globe. The lighting cover 70 is made of, for example, a milky white resin, and can diffuse the light from each light-emitting element 21 and emit it to the outside.

[0035] The lighting cover 70 has a circular outer shape in a plan view. The lighting cover 70 is attached to the fixture body 110 in a freely detachable manner. In this embodiment, a circular decorative plate 71 corresponding to the outer shape (circular shape) of the lighting cover 70 in a plan view is attached to the outer periphery of the lighting cover 70. The decorative plate 71 is fixed to the lighting cover 70 by a plurality of screws (not shown) or the like. The lighting cover 70 is attached to and detached from the fixture body 110 with the decorative plate 71 fixed.

[0036] [Specific configuration of the light-emitting module] Next, a specific configuration of the light-emitting module 10 will be described with reference to FIGS.

[0037] Fig. 3 is a perspective view showing the structural relationship between the light emitting module 10 and the optical member 60 according to the present embodiment. Fig. 4 is a plan view of the light emitting module 10 according to the present embodiment. Fig. 5 is a plan view showing each region of the light emitting module 10 according to the present embodiment. Fig. 6 is an enlarged plan view of region VI in Fig. 4.

[0038] The outer shape of the substrate 11 in plan view is polygonal. More specifically, the outer shape of the substrate 11 in plan view is rectangular.

[0039] Here, "rectangular" includes a shape in which the tips of the four corners of a rectangle (quadrant) are cut off. In other words, "rectangular" does not only mean a rectangle (rectangle or square) in the strict sense, but also includes a shape in which at least one side is cut out or at least one vertex is chamfered. The outer shape of substrate 11 has three or more straight line portions (sides).

[0040] 4 and 5, substrate 11 includes four sides 17 and four corners 18. In the present embodiment, substrate 11 has a square shape in a plan view, and the lengths of the four sides 17 are equal to each other. For example, length x1 of side 17 extending in the X-axis direction is equal to length y1 of side 17 extending in the Y-axis direction.

[0041] Corner portion 18 is a part of the outer periphery of substrate 11 in plan view, other than the four sides 17. For example, corner portion 18 is formed by cutting out the corners (portions including the vertices) of a square. In this embodiment, corner portion 18 is a gently curved line that connects the ends of two adjacent sides 17. Corner portion 18 may also be a straight line. In this case, the outer shape of substrate 11 in plan view is an octagon, but is considered to be a "square shape" in this specification.

[0042] For example, the length of corner 18 in the X-axis direction is x2, and the length in the Y-axis direction is y2. In this case, x2 is 1 / 2 or less of x1. This makes it possible to maximize the proportion of side 17 in the X-axis direction of substrate 11 when corners 18 of the same size are provided at both ends of side 17. x2 may be 1 / 3 or less of x1, or 1 / 4 or less of x1. Similarly, with respect to y2 and y1, y2 may be 1 / 2 or less of y1, 1 / 3 or less of y1, or 1 / 4 or less of y1.

[0043] The four corners 18 may include corners having different sizes and shapes. The four corners 18 may be vertices of a rectangle. That is, the outer shape of the substrate 11 in a plan view may be rectangular.

[0044] A circular opening 12 is formed in the center of the substrate 11 and is centered on the central axis J of the lighting fixture 100. The opening 12 is a through hole into which the support part 119 of the fixture body 110 is inserted.

[0045] As shown in Figures 4 and 5, main surface 11a of substrate 11 is divided into a light-emitting region 13 which is a mounting region for light-emitting elements 21, and a circuit region 14 which is a mounting region for circuit components 81. The dashed lines shown in Figures 4 and 5 indicate a boundary 15 between light-emitting region 13 and circuit region 14. Light-emitting region 13 is a ring-shaped region outside boundary 15. Circuit region 14 is a rounded rectangular region inside boundary 15.

[0046] The boundary 15 includes four straight line portions 15a along each side 17 of the substrate 11, and four arcuate portions 15b connecting the ends of the four straight line portions 15a. Each of the four straight line portions 15a is shorter than the corresponding side 17. Each of the four arcuate portions 15b corresponds to ¼ of a circumference (i.e., a central angle of 90 degrees). The curvature of the arcuate portions 15b is smaller than the curvature of the corners 18. The boundary 15 corresponds to the outer shape of the circuit cover 50, for example.

[0047] 5, the light emitting region 13 includes a first region 13a, a second region 13b, and a third region 13c. The first region 13a, the second region 13b, and the third region 13c are each shaded differently. The boundaries between the regions are indicated by dashed lines.

[0048] The first region 13a is a region along the side 17 of the substrate 11. Specifically, the first region 13a is a rectangular region having the straight line portion 15a and a part of the side 17 as two opposing sides.

[0049] The second region 13b is closer to the corner 18 of the substrate 11 than the first region 13a. In a plan view, the second region 13b is a region sandwiched between two dashed dotted lines connecting the central axis J and both ends of the corner 18. Specifically, the second region 13b is a region surrounded by the two dashed dotted lines, the corner 18, and the arc portion 15b.

[0050] The third region 13c is a region located between the first region 13a and the second region 13b.

[0051] In this embodiment, the plurality of light-emitting elements 21 are arranged in multiple rings centered on the opening 12 of the substrate 11. The number of columns of the light-emitting elements 21 is different in each of the first region 13a, the second region 13b, and the third region 13c. The arrangement of the light-emitting elements 21 will be described below with reference to FIG. 6. Note that the dashed dotted line shown in FIG. 6 is the same as the dashed dotted line shown in FIG. 5, and is a boundary line dividing the first region 13a, the second region 13b, and the third region 13c.

[0052] As shown in FIG. 6, the plurality of light emitting elements 21 include a plurality of first light emitting elements 211, a plurality of second light emitting elements 212, a plurality of third light emitting elements 213, and a plurality of fourth light emitting elements 214.

[0053] The first light emitting elements 211 are arranged in a ring shape along the outer shape of the substrate 11 to form a first element row 201. The first element row 201 is an element row located at the outermost periphery among the multiple element rows arranged in a ring shape. As shown in FIG. 6, the first light emitting elements 211 are arranged in a straight line along the side 17 in the first region 13a and the third region 13c. The first light emitting elements 211 are arranged in a substantially straight line along the corner 18 in the second region 13b. The first light emitting elements 211 are arranged at substantially equal intervals. As shown in FIG. 6, the interval (pitch) between two adjacent first light emitting elements 211 is Q1. The interval Q1 is the center-to-center distance between two adjacent first light emitting elements 211 in a plan view.

[0054] The second light emitting elements 212 are arranged in a ring shape inside the first element row 201 to form the second element row 202. The second element row 202 is an element row located on the innermost circumference among the multiple element rows arranged in a ring shape. As shown in FIG. 6, the second light emitting elements 212 are arranged in a line shape along the straight line portion 15a of the boundary 15 in the first region 13a. The second light emitting elements 212 are arranged in an arc shape along the arc portion 15b of the boundary 15 in the second region 13b and the third region 13c. The second light emitting elements 212 are arranged at approximately equal intervals. As shown in FIG. 6, the interval (pitch) between two adjacent second light emitting elements 212 is Q2. The interval Q2 is the center-to-center distance between two adjacent second light emitting elements 212 in a plan view.

[0055] In this embodiment, the distance between the first element row 201 and the second element row 202 is larger in the second region 13b than in the first region 13a. For example, as shown in Fig. 6, the distance P2 in the second region 13b is larger than the distance P1 in the first region 13a.

[0056] The interval P1 is the shortest center-to-center distance between the first light-emitting element 211 and the second light-emitting element 212 arranged in the first region 13a in a planar view. Similarly, the interval P2 is the shortest center-to-center distance between the first light-emitting element 211 and the second light-emitting element 212 arranged in the second region 13b in a planar view.

[0057] Furthermore, the interval Q1 between the first light-emitting elements 211 is smaller than the interval P1 between the first element row 201 and the second element row 202. In other words, the first light-emitting elements 211 are arranged such that the interval in the arrangement direction of the first light-emitting elements 211 (the direction along the outer shape of the substrate 11) is narrower than the interval in a direction perpendicular to the arrangement direction (the direction toward the center of the substrate 11). The interval Q1 is, for example, 8.5 mm, and the interval P1 is, for example, 14.5 mm, but is not limited to this.

[0058] Furthermore, the interval Q2 between the second light emitting elements 212 is shorter than the interval Q1 between the first light emitting elements 211. In other words, the second light emitting elements 212 on the inner circumferential side are arranged more densely than the first light emitting elements 211 on the outer circumferential side.

[0059] The plurality of third light-emitting elements 213 are disposed in the second region 13b between the first element row 201 and the second element row 202. Specifically, the plurality of third light-emitting elements 213 constitute a third element row 203 and a fourth element row 204.

[0060] The third element row 203 is an element row extending along the arrangement direction of the multiple first light emitting elements 211. In the present embodiment, the multiple third light emitting elements 213 constituting the third element row 203 are arranged in an arc shape. The third element row 203 includes four light emitting elements 213, but the number is not particularly limited.

[0061] The fourth element row 204 is an element row extending in the arrangement direction of the plurality of second light emitting elements 212 between the third element row 203 and the second element row 202. In the present embodiment, the plurality of third light emitting elements 213 constituting the fourth element row 204 are arranged in an arc shape. The fourth element row 204 includes three light emitting elements 213, but the number is not particularly limited.

[0062] The multiple fourth light-emitting elements 214 are arranged between the first element row 201 and the second element row 202 in the third region 13c. The multiple fourth light-emitting elements 214 constitute a fifth element row 205. The multiple fourth light-emitting elements 214 constituting the fifth element row 205 are arranged in a straight line extending in a diagonal direction with respect to the side 17. The fifth element row 205 includes three light-emitting elements 214, but the number is not particularly limited and may be only one.

[0063] Thus, in the light-emitting module 10 according to the present embodiment, the light-emitting elements 21 are arranged in two rows in the first region 13a along the side 17 of the substrate 11. In the third region 13c, the light-emitting elements 21 are arranged in three rows. In the second region 13b closer to the corner 18 of the substrate 11, the light-emitting elements 21 are arranged in four rows. In this way, the light-emitting elements 21 are arranged more densely in the region closer to the corner 18. This makes it possible to enlarge the lamp image of the lighting fixture 100.

[0064] The above-mentioned arrangement of the light-emitting elements 21 contributes to improving heat dissipation while ensuring spacing and achieving both a large luminous flux and high uniformity while increasing the number of mounted light-emitting elements 21. In this embodiment, the ratio of the light-emitting area 13 of the main surface 11a of the substrate 11 occupied by the multiple light-emitting elements 21 is 3% or more. This ratio can be calculated by multiplying the area of ​​each light-emitting element 21 in a plan view by the total number of light-emitting elements 21 mounted on the main surface 11a by the area of ​​the light-emitting area 13 by 100. Here, it is assumed that the areas of all the light-emitting elements 21 are the same. When light-emitting elements 21 with different areas are included, the areas of the individual light-emitting elements 21 may be added together. For example, the area of ​​the light-emitting element 21 is 3 mm×3 mm, but is not limited thereto.

[0065] The ratio of 3% or more is a value larger than the ratio in LED boards used in general ceiling lights. In this embodiment, rectangular board 11 is used, and light emitting elements 21 are densely arranged in light emitting area 13 having a small mounting area. This makes it possible to secure the necessary luminous flux and improve the uniformity while suppressing the material cost of board 11.

[0066] The proportion of the light emitting region 13 on the main surface 11a of the substrate 11 that is occupied by the multiple light emitting elements 21 may be 5% or more, or may be 7% or more. Moreover, the proportion of the light emitting region 13 on the main surface 11a of the substrate 11 that is occupied by the multiple light emitting elements 21 is 11% or less. This prevents the light emitting elements 21 from being too densely packed, and can suppress deterioration of heat dissipation properties.

[0067] [Specific configuration of optical components] Next, a specific configuration of the optical member 60 will be described with reference to FIG. 3 and FIG. 7 to FIG.

[0068] Fig. 7 is a plan view of an optical member 60 according to the present embodiment. Fig. 8 corresponds to region VI in Fig. 4 and is an enlarged plan view of the optical member 60 according to the present embodiment as viewed from the light emitting module 10 side. Fig. 9 is a perspective view of a part of the optical member 60 according to the present embodiment as viewed from the light emitting module 10 side. Fig. 10 is an end view of the lighting device 100 when cut at the position represented by the line XX in Fig. 8.

[0069] As shown in Figs. 3 and 7, the optical member 60 according to the present embodiment has a plurality of lenses 61 and a plurality of storage sections 62. Each of the plurality of lenses 61 corresponds one-to-one with a plurality of light-emitting elements 21 arranged on the main surface 11a of the substrate 11. Each of the plurality of storage sections 62 corresponds one-to-one with a plurality of light-emitting elements 21 and is a space for storing the corresponding light-emitting element 21. For example, when focusing on one light-emitting element 21 (light-emitting element 21a in Fig. 3) among the plurality of light-emitting elements 21, one lens 61 (lens 61a in Fig. 3) among the plurality of lenses 61 is arranged in front of it (positive direction of the Z axis). Specifically, the light-emitting element 21a is arranged in the corresponding storage section 62a. The light emitted by the light-emitting element 21a arranged in the storage section 62a is diffused by the lens 61a and emitted forward (positive direction of the Z axis).

[0070] The lens 61 having such an optical function is disposed at a position facing each of the plurality of light-emitting elements 21 arranged in a multiple ring shape in the Z-axis direction. That is, the plurality of lenses 61 and the plurality of housing portions 62 are arranged in a multiple ring shape like the plurality of light-emitting elements 21, as shown in FIG.

[0071] 8 and 9, the lenses 61 include a plurality of first lenses 161, a plurality of second lenses 162, a plurality of third lenses 163 and 164, and a plurality of fourth lenses 165. The housing sections 62 include a plurality of first housing sections 261, a plurality of second housing sections 262, a plurality of third housing sections 263 and 264, and a plurality of fourth housing sections 265.

[0072] The first lenses 161 correspond one-to-one to the first storage sections 261. The second lenses 162 correspond one-to-one to the second storage sections 262. The third lenses 163 correspond one-to-one to the third storage sections 263. The third lenses 164 correspond one-to-one to the third storage sections 264. The fourth lenses 165 correspond one-to-one to the fourth storage sections 265. Each storage section is a space surrounded by the light incidence surface of the corresponding lens. That is, the main surface of the optical member 60 on the light emitting module 10 side is recessed in a direction away from the light emitting module 10 (Z-axis positive direction) so as to form the storage section 62.

[0073] The multiple first lenses 161 correspond one-to-one to the multiple first light-emitting elements 211. The multiple first lenses 161 are arranged in a ring shape along the outer shape of the substrate 11 of the light-emitting module 10. The multiple first lenses 161 constitute a lens row (first lens row) located at the outermost periphery among the multiple lens rows arranged in multiple rings. The arrangement (arrangement) of the multiple first lenses 161 is the same as the arrangement of the first light-emitting elements 211.

[0074] 10, each of the multiple first lenses 161 has a curved outer surface 161a. The outer surface 161a is a light emission surface of the first lens 161. Among the multiple first lenses 161, the curved outer surfaces 161a of two adjacent first lenses 161 are connected to each other. In other words, there is no flat surface between two adjacent outer surfaces 161a.

[0075] Each of the first housing portions 261 is a concave space (recess). The inner surface of the space (recess) is the light incident surface of the corresponding first lens 161. Each of the first housing portions 261 houses a corresponding first light emitting element 211.

[0076] The second lenses 162 correspond one-to-one to the second light-emitting elements 212. The second lenses 162 are arranged in a ring shape on the inner side of the first lenses 161. The second lenses 162 form a lens row (second lens row) located on the innermost periphery among the lens rows arranged in a multiple ring shape. The arrangement (disposition) of the second lenses 162 is the same as the arrangement of the second light-emitting elements 212.

[0077] Each of the second lenses 162 has a curved outer surface, similar to the first lens 161. The curved outer surface is a light emission surface of the second lens 162. Among the second lenses 162, two adjacent second lenses 162 have their curved outer surfaces connected to each other. Furthermore, adjacent first lenses 161 and second lenses 162 have their curved outer surfaces connected to each other. In this embodiment, as shown in FIG. 8, the first lens 161 and the second lens 162 are adjacent to each other in the first region 13a. In the second region 13b and the third region 13c, the third lens 163 or 164, or the fourth lens 165 is disposed between the first lens 161 and the second lens 162.

[0078] Each of the second housing portions 262 is a concave space (recess). The inner surface of the space (recess) is the light incident surface of the corresponding second lens 162. Each of the second housing portions 262 houses a corresponding second light emitting element 212.

[0079] The multiple third lenses 163 and 164 are in one-to-one correspondence with the multiple third light-emitting elements 213. The multiple third lenses 163 are in one-to-one correspondence with the multiple third light-emitting elements 213 constituting the third element row 203 shown in Fig. 6. The multiple third lenses 164 are in one-to-one correspondence with the multiple third light-emitting elements 213 constituting the fourth element row 204 shown in Fig. 6.

[0080] Each of the multiple third lenses 163 and 164 has a curved outer surface. The curved outer surface is the light exit surface of each lens. The curved outer surface of each of the multiple third lenses 163 and 164 is connected to the outer surfaces of the adjacent lenses. For example, the outer surface of one third lens 163 is connected to the outer surfaces of the first lens 161, the third lens 163, and the third lens 164 adjacent to the one third lens 163. Similarly, the outer surface of one third lens 164 is connected to the outer surfaces of the third lens 163, the third lens 164, and the second lens 162 adjacent to the one third lens 164.

[0081] Each of the third housing portions 263 and 264 is a concave space (recess). The inner surface of the space (recess) is the light incident surface of the corresponding third lens 163 or 164. Each of the third housing portions 263 and 264 houses a corresponding third light emitting element 213.

[0082] The multiple fourth lenses 165 correspond one-to-one to the multiple fourth light-emitting elements 214. The multiple fourth lenses 165 are disposed between the first lens 161 and the second lens 162 in the third region 13c. The arrangement (arrangement) of the multiple fourth lenses 165 is the same as the arrangement of the fourth light-emitting elements 214.

[0083] As shown in FIG. 10, the plurality of fourth lenses 165 have a curved outer surface 165a. The outer surface 165a is a light emission surface of the fourth lens 165. Among the plurality of fourth lenses 165, the curved outer surfaces 165a of two adjacent fourth lenses 165 are connected to each other. In other words, there is no flat surface between the two adjacent outer surfaces 165a. Also, as shown in FIG. 10, the outer surface 165a of the fourth lens 165 is connected to each of the outer surface 161a of the first lens 161 and the outer surface of the second lens 162.

[0084] Each of the fourth housing portions 265 is a concave space (recess). The inner surface of the space (recess) is the light incident surface of the corresponding fourth lens 165. Each of the fourth housing portions 265 houses a corresponding fourth light emitting element 214.

[0085] [Communication section] As described above, the optical member 60 has the housing portion 62 for housing the light-emitting element 21. By making the housing portion 62 smaller and bringing the light incident surface closer to the light-emitting element 21, it is possible to reduce leakage of light emitted from the light-emitting element 21. On the other hand, heat generated by the light-emitting element 21 when it emits light tends to accumulate in the housing portion 62, and the temperature of the light-emitting element 21 rises, resulting in a decrease in light-emitting performance.

[0086] In contrast, the optical member 60 has a communication portion 63 as shown in Figs. 8 to 10. The communication portion 63 is an example of a first communication portion that is a space that communicates the adjacent storage portions 62. For example, the communication portion 63 (communication portion 365) shown in Fig. 10 communicates the first storage portion 261 and the fourth storage portion 265. The communication portion 63 is a concave space in which the main surface of the optical member 60 on the light-emitting module 10 side is recessed, similar to the storage portion 62. The communication portion 63 is a space in a shape in which a part of the back surface of the optical member 60 (i.e., the main surface facing the main surface 11a of the substrate 11) is cut out. The provision of the communication portion 63 allows air to move between the storage portions 62 (i.e., convection). This makes it easier to dissipate heat generated by the light-emitting element 21 when it emits light. This makes it possible to suppress a temperature rise caused by heat generated by the light-emitting element 21.

[0087] The cutout height h2 of the communication portion 63 is equal to or greater than the height h1 from the main surface 11a of the light emitting element 21. This can improve convection and suppress a temperature rise due to heat generation of the light emitting element 21. The bottom surface of the communication portion 63 (the upper surface in FIG. 10) is flat, but is not limited to this.

[0088] In this embodiment, the optical member 60 has a plurality of communication parts 63. The plurality of communication parts 63 are provided in a portion where the distance between two adjacent housing parts 62 is short. The distance between the housing parts 62 depends on the distance between two adjacent light-emitting elements 21. The communication parts 63 are provided in a portion where the distance between the light-emitting elements 21 is shorter than a predetermined distance, and are not provided in a portion where the distance between the light-emitting elements 21 is longer than the predetermined distance.

[0089] For example, when the diameter of the storage section 62 is D and the distance (pitch) between the lenses 61 (between the light-emitting elements 21) is P, the communicating section 63 is provided in the portion where PD is smaller than 2 mm. PD corresponds to the thickness of the wall between two adjacent storage sections 62. Therefore, if the communicating section 63 is not provided in the portion where PD is smaller than 2 mm, the wall between the two adjacent storage sections 62 becomes too thin, and when the optical member 60 is formed by injection molding using a resin material, it is difficult for the resin material to sufficiently spread to the wall portion. As a result, depending on the portion of the optical member 60, there will be variations such as a portion with a wall, a portion with a thin wall, and a portion without a wall, and the light distribution performance of the optical member 60 may be deteriorated. By providing the communicating section 63 in advance in such a portion, the moldability of the optical member 60 can be improved.

[0090] For example, as shown in FIG. 8, the plurality of communication portions 63 include communication portions 361, 362, 363, and 365.

[0091] The communication portion 361 is provided between two adjacent first housing portions 261 in the second region 13b. For example, the second region 13b is provided with four first lenses 161 and four first housing portions 261 corresponding to the four first light-emitting elements 211. As shown in Fig. 8, of the four first housing portions 261, two communication portions 361 are provided so as to communicate two first housing portions 261 each.

[0092] The communication portion 362 is provided between two adjacent second accommodating portions 262. As shown in Fig. 8, the communication portion 362 is provided between two adjacent second accommodating portions 262 in each of the first region 13a, the second region 13b, and the third region 13c. Furthermore, the communication portion 362 is provided between two second accommodating portions 262 straddling the boundary between the first region 13a and the third region 13c, and between two second accommodating portions 262 straddling the boundary between the second region 13b and the third region 13c.

[0093] The communication portion 363 is provided between the adjacent first accommodating portion 261 and third accommodating portion 263 in the second region 13b. The communication portion 363 is further provided between the first accommodating portion 261 located in the third region 13c and the third accommodating portion 263 located in the second region 13b.

[0094] The communication portion 365 is provided between the fourth accommodation portion 265 and at least one of the first accommodation portion 261 and the second accommodation portion 262 in the third region 13c. For example, for the fourth accommodation portion 265 closest to the first region 13a, the communication portion 365 is provided between the one first accommodation portion 261 closest to this fourth accommodation portion 265 and each of the two second accommodation portions 262 closest to this fourth accommodation portion 265. In addition, the communication portion 365 is provided between the fourth accommodation portion 265 second closest to the first region 13a (the accommodation portion through which the XX line in FIG. 8 passes) and the one first accommodation portion 261 closest to this fourth accommodation portion 265.

[0095] In the present embodiment, the third storage portions 264 located in the second region 13b are not connected to a communication portion because the distance between the third storage portion 264 and each of the adjacent second storage portions 262 and third storage portions 263 and 264 is long.

[0096] As described above, by selectively providing the communication portion 63, it is possible to suppress a decrease in the light distribution performance of the lens 61 compared to a case in which the communication portion 63 is provided so as to communicate between all of the storage portions 62. Note that the communication portion 63 shown in FIG. 8 is merely an example. For example, there may be only one communication portion 63. Also, the communication portion 63 may be provided so as to communicate between all of the storage portions 62.

[0097] The optical member 60 has a circular outer shape in a plan view. The outer shape of the optical member 60 in a plan view is substantially the same as the outer shape of the mounting surface portion 112 of the device body 110. Specifically, the optical member 60 has a plurality of planar portions 65. The plurality of planar portions 65 are provided so as to protrude outward beyond the plurality of lenses 61 in a plan view.

[0098] 10, an air layer is provided between the flat portion 65 and the device body 110. In other words, at least a part of the back surface 66 of the flat portion 65 is not in contact with the substrate 11 and the mounting surface portion 112 of the device body 110.

[0099] A portion of the light emitted from the light-emitting element 21 travels inside (within the thickness of) the planar portion 65. The light that travels inside the planar portion 65 is guided inside the planar portion 65 while repeatedly being totally reflected at each of the back surface 66 and the front surface 67. A portion of the light inside the planar portion 65 is emitted from the front surface 67, contributing to improving the light extraction efficiency. With this configuration, the light is not absorbed on the surface of the fixture body 110, as compared to when it is reflected on the surface (mounting surface portion 112) of the fixture body 110, and therefore the light extraction efficiency can be improved.

[0100] As described above, the optical member 60 and the substrate 11 are fixed to the device body 110 together with the circuit cover 50 by a plurality of screws or the like. A configuration for restricting the optical member 60 and the substrate 11 to the correct position relative to the device body 110 during this fixing operation is provided on the device body 110 or the like. Specifically, as shown in FIG. 2, the device body 110 has a restricting protrusion 115. The substrate 11 is provided with a cutout portion 19 (see FIGS. 3 and 4) into which the restricting protrusion 115 is inserted. Furthermore, the optical member 60 is formed with a recess 68 (see FIGS. 3 and 7) into which the restricting protrusion 115 is inserted. The recess 68 is formed in a concave shape in a direction away from the substrate 11 on the surface facing the substrate 11 (the surface on the negative Z-axis direction side).

[0101] That is, in this embodiment, the restricting protrusion 115 engages with the notch 19 of the substrate 11 and the recess 68 of the optical member 60. Furthermore, there are two such sets of the restricting protrusion 115, the notch 19, and the recess 68. This determines the positions and attitudes of the optical member 60 and the substrate 11 relative to the device body 110 to be normal positions and attitudes.

[0102] [Specific composition of the reflective sheet] Next, a specific configuration of the reflective sheet 40 will be described with reference to FIG.

[0103] The reflective sheet 40 is disposed between the substrate 11 and the optical member 60 of the light-emitting module 10. The reflective sheet 40 is a sheet-like member made of, for example, resin, and reflects light that travels directly and indirectly from the light-emitting elements 21 toward the reflective sheet 40.

[0104] Specifically, as shown in FIG. 3, the reflection sheet 40 has a plurality of through holes 41 formed therein, which expose each of the plurality of light-emitting elements 21 to the side of the optical member 60. For example, when the reflection sheet 40 is disposed along the main surface 11a of the substrate 11 of the light-emitting module 10, the light-emitting element 21a in FIG. 3 is inserted into the through hole 41 (the through hole 41a in FIG. 3) located at a position facing each other in the Z-axis direction. That is, when viewed from the front (Z-axis positive direction), the light-emitting element 21a is exposed from the reflection sheet 40, and the light emitted from the light-emitting element 21a is directed toward the optical member 60 without being blocked by the reflection sheet 40. Also, the light directed directly and indirectly from the light-emitting element 21a toward the reflection sheet 40 is reflected by the reflection sheet 40 and directed toward the optical member 60. That is, the reflection sheet 40 suppresses the loss of light between the light-emitting element 21a and the optical member 60. Furthermore, the reflective sheet 40 has a plurality of through holes 41 through which the plurality of light emitting elements 21 are exposed, and the above-mentioned effect of suppressing light loss can be obtained for each of the plurality of light emitting elements 21.

[0105] In addition, in this embodiment, the reflection sheet 40 is formed with a plurality of through holes 41 such that each of the plurality of light-emitting elements 21 can be inserted into the through hole 41 regardless of the rotation position when the reflection sheet 40 is rotated 90° around the Z axis from the posture shown in Fig. 3. Furthermore, the reflection sheet 40 can be placed on the substrate 11 without distinguishing between the front and back. In other words, the plurality of through holes 41 are formed such that each of the plurality of light-emitting elements 21 can be inserted into the through hole 41 even when the reflection sheet 40 is rotated (flipped) 180° around the X axis or the Y axis from the posture shown in Fig. 3.

[0106] In addition, the multiple light-emitting elements 21 are not arranged at positions rotationally symmetrical at every 90° around the center of the substrate 11 in a plan view due to the convenience of the layout of the wiring connected to the multiple light-emitting elements 21 or the arrangement position of the notch 19 of the substrate 11. Therefore, the positions of the multiple through holes 41 corresponding one-to-one to the multiple light-emitting elements 21 are also not rotationally symmetrical at every 90°. Therefore, for example, assume that the reflection sheet 40 has the through holes 41 only at positions corresponding to the multiple light-emitting elements 21. In this case, there is only one rotational position at which the reflection sheet 40 can be arranged on the substrate 11 without any problems. Therefore, the work of adjusting the reflection sheet 40, which is recognized as being rotationally symmetrical at every 90° due to its rectangular outer shape, to the correct rotational position with respect to the fixture body 110 may become complicated.

[0107] Therefore, the reflection sheet 40 is provided with through holes 41 in a number greater than the number of light-emitting elements 21 arranged on the substrate 11. In other words, in plan view, there are through holes 41 in which no light-emitting elements 21 are arranged. More specifically, the number and positions of the multiple through holes 41 are determined so that when the reflection sheet 40 is rotated 90° around the center in plan view, all of the light-emitting elements 21 arranged on the substrate 11 are exposed at any rotation position.

[0108] Furthermore, when both sides of the reflection sheet 40 in the thickness direction (Z-axis direction) are the same color, it is not easy to determine the front and back of the reflection sheet 40. Therefore, the number and positions of the multiple through holes 41 are determined so that when the reflection sheet 40 is inverted around the X-axis or Y-axis, all of the light-emitting elements 21 arranged on the substrate 11 are exposed, regardless of whether the reflection sheet 40 is inverted before or after the inversion. As a result, when the reflection sheet 40 is arranged to cover the substrate 11 in the process of assembling the lighting device 100, it can be arranged without worrying about the rotation position and front and back of the reflection sheet 40. This contributes to the efficiency of assembling (manufacturing) the lighting device 100.

[0109] [Effects, etc.] As described above, the lighting fixture 100 according to the present embodiment includes the fixture body 110, the substrate 11 attached to the fixture body 110, the light-emitting module 10 having the plurality of light-emitting elements 21 arranged on the main surface 11a of the substrate 11, and the optical member 60 arranged on the main surface 11a side of the light-emitting module 10. The optical member 60 includes a plurality of storage sections 62 which correspond one-to-one to the plurality of light-emitting elements 21 and are spaces for accommodating the corresponding light-emitting elements 21, a plurality of lenses 61 which correspond one-to-one to the plurality of light-emitting elements 21 and emit light from the corresponding light-emitting elements 21 in a predetermined light distribution state, and a communication section 63 which is a space communicating between two adjacent storage sections 62 among the plurality of storage sections 62.

[0110] This can improve convection within the housing portion 62 and between the housing portions 62, and can suppress a temperature rise due to heat generation from the light emitting element 21.

[0111] Moreover, by providing the communication portion 63 instead of the wall between two adjacent storage portions 62, the moldability of the optical member 60 can be improved. This makes it possible to use a resin material with poor fluidity, thereby increasing the degree of freedom in selecting the material of the optical member 60. Furthermore, since it is possible to design a lens assuming that the communication portion 63 is provided, it is possible to suppress a decrease in the light distribution performance of the optical member 60.

[0112] Also, for example, the communication portion 63 is a space having a shape obtained by cutting out a part of the back surface of the optical member 60 facing the main surface 11a of the substrate 11. The cutout height h2 of the communication portion 63 is equal to or greater than the height h1 of the light-emitting element 21 from the main surface 11a.

[0113] This can improve convection within and between the housing portions 62, and can suppress a temperature rise due to heat generation from the light emitting elements 21.

[0114] Also, for example, the multiple light emitting elements 21 are arranged in a ring shape along the outer shape of the substrate 11, and include multiple first light emitting elements 211 constituting the first element row 201, and multiple second light emitting elements 212 arranged in a ring shape inside the first element row 201 and constituting the second element row 202. The multiple housing portions 62 include multiple first housing portions 261 corresponding one-to-one to the multiple first light emitting elements 211, and multiple second housing portions 262 corresponding one-to-one to the multiple second light emitting elements 212. The communication portion 63 (communication portion 362 shown in FIGS. 8 and 9) is provided between two adjacent second housing portions 262 of the multiple second housing portions 262.

[0115] As a result, the communication portion 362 is provided along the inner second element row 202 where the distance between the light emitting elements 21 is narrow, so that the effect of suppressing the temperature rise of the light emitting elements 21 can be effectively exerted.

[0116] For example, the outer shape of the substrate 11 in a plan view is polygonal. The plurality of light-emitting elements 21 further includes a plurality of third light-emitting elements 213 arranged between the first element row 201 and the second element row 202. The main surface 11a includes a first region 13a along the side 17 of the substrate 11, and a second region 13b closer to the corner 18 of the substrate 11 than the first region 13a. The plurality of third light-emitting elements 213 are arranged in the second region 13b.

[0117] As a result, since the third light-emitting element 213 is arranged in the second region 13b close to the corner 18, it is possible to increase the number of light-emitting elements 21 arranged in the second region 13b. This makes it possible to make the lamp image of the lighting device 100 look larger. The lamp image corresponds to the apparent light-emitting range when the lighting device 100 is viewed from the front.

[0118] Fig. 11 is a diagram showing a lamp image of lighting fixture 100 according to this embodiment. In Fig. 11, the dashed circle represents the size of a circular substrate having the same mounting area as the mounting area of ​​light emitting elements 21 on rectangular substrate 11. According to this embodiment, many light emitting elements 21 are arranged near corners 18 of substrate 11, thereby increasing the luminance in the vicinity of corners 18. As a result, as shown in Fig. 11, a larger lamp image can be obtained than that of a circular substrate having the same mounting area.

[0119] Furthermore, for example, the communication portion 63 (the communication portion 361 shown in FIG. 8) is further provided between two adjacent first accommodation portions 261 among the plurality of first accommodation portions 261 in the second region 13b.

[0120] This allows the first light emitting elements 211 on the outer periphery to be arranged with narrower intervals in the second region 13b close to the corner 18. Since the number of light emitting elements 21 arranged in the second region 13b can be increased, the lamp image of the lighting fixture 100 can be made to look larger while suppressing the temperature rise of the light emitting elements 21.

[0121] Furthermore, for example, the multiple housing portions 62 include multiple third housing portions 263 and 264 that correspond one-to-one to the multiple third light-emitting elements 213. A communication portion 63 (a communication portion 363 shown in FIG. 8) is further provided between the neighboring third housing portion 263 and first housing portion 261 in the second region 13b.

[0122] This allows the light emitting elements 21 to be arranged with narrower intervals in the second region 13b close to the corner 18. Since the number of light emitting elements 21 arranged in the second region 13b can be increased, the lamp image of the lighting fixture 100 can be made to look larger while suppressing the temperature rise of the light emitting elements 21.

[0123] Furthermore, for example, the main surface 11a includes a third region 13c located between the first region 13a and the second region 13b. The plurality of light-emitting elements 21 includes a fourth light-emitting element 214 arranged between the first element row 201 and the second element row 202 in the third region 13c. The plurality of housing portions 62 includes a fourth housing portion 265 corresponding to the fourth light-emitting element 214. A communication portion 63 (communication portion 365 shown in FIGS. 8 and 9) is further provided between the fourth housing portion 265 and at least one of the first housing portion 261 and the second housing portion 262.

[0124] This allows the difference in the number of light-emitting elements 21 between the first region 13a and the second region 13b to be mitigated in the third region 13c. In other words, the difference in the amount of light between the first region 13a and the second region 13b can be prevented from becoming too large, thereby increasing the uniformity. In addition, the temperature rise of the light-emitting elements 21 in the third region 13c can be suppressed.

[0125] Moreover, for example, the light emitting module 10 further includes a power supply circuit 80 that is disposed on the substrate 11 and supplies power for the plurality of light emitting elements 21 to emit light.

[0126] This allows the light emitting element 21 and the power supply circuit 80 to be incorporated into one substrate 11, thereby simplifying the manufacturing process. For example, the lighting device 100 can be easily assembled.

[0127] Furthermore, for example, the lighting fixture 100 further includes a fixture attachment part 90 that is disposed in the center of the fixture body 110 and that detachably attaches the fixture body 110 to a ceiling. The plurality of light-emitting elements 21 surround the fixture body 110 in a plan view.

[0128] This allows a large number of light emitting elements 21 to be arranged on a wide main surface, such as a ceiling light, to form a large lamp image and illuminate the entire space.

[0129] [Variations] Here, modified examples of the embodiment will be described. In the following modified examples, the differences from the embodiment will be mainly described, and the description of the commonalities will be omitted or simplified.

[0130] [Variation 1] 12 is an end view of a lighting device 100A according to Modification 1. Fig. 12 shows the same end view as the end view shown in Fig. 10.

[0131] 12, the lighting device 100A includes a substrate 11A and a device body 110A instead of the substrate 11 and the device body 110. The substrate 11A and the device body 110A are each provided with a through hole 11c that penetrates therethrough in the thickness direction.

[0132] Through hole 11c is an example of an opening provided at a position overlapping storage section 62 or communication section 63 in plan view. In this modification, through hole 11c penetrates device body 110A, thereby connecting storage section 62 to the external space of lighting device 100A. This can improve air convection within storage section 62.

[0133] The through-hole 11c does not have to penetrate the appliance main body 110A. Even in this case, the volume of the space communicating with the storage portion 62 is increased, so that air convection can be easily generated.

[0134] In this case, through hole 11c may extend to the edge of substrate 11. For example, through hole 11c may have a shape cut out from side 17 or corner 18 toward light emitting element 21. Since substrate 11 has a ring shape in a plan view, through hole 11c may extend to the inner edge of substrate 11, i.e., opening 12.

[0135] As described above, in lighting device 100A according to this modification, substrate 11A is provided with through-holes 11c that penetrate substrate 11 in the thickness direction at positions that overlap multiple storage portions 62 or communication portions 63 in a plan view.

[0136] This can further improve convection within the housing portion 62, making it possible to suppress a temperature rise due to heat generation from the light emitting element 21.

[0137] Furthermore, for example, the through-hole 11c may extend to the edge of the substrate 11 in a plan view.

[0138] This can further improve convection within the housing portion 62, thereby suppressing a temperature rise due to heat generation from the light emitting element 21. The housing portion 62 to which the through hole 11c communicates does not necessarily need to be provided with the communication portion 63. For example, the through hole 11c may communicate with the third housing portion 264 shown in FIG. 8. Since the communication portion 63 is not provided, a decrease in the light distribution performance of the lens 61 is also suppressed, while a temperature rise in the light emitting element 21 can be suppressed.

[0139] Also, for example, a heat dissipation pattern formed using a metal material may be provided on the substrate 11, and the heat dissipation pattern may overlap the communication portion 63 in a plan view. For example, the heat dissipation pattern may extend from the vicinity of the light emitting element 21 to the edge of the substrate 11. Unlike the wiring for supplying power to the light emitting element 21, the heat dissipation pattern is not electrically connected.

[0140] This allows heat to be quickly dissipated via the heat dissipation pattern, so that an increase in temperature due to heat generation from the light emitting element 21 can be further suppressed.

[0141] [Variation 2] Fig. 13 is a plan view of an optical member 60B of an illumination device according to Modification 2. Like Fig. 8, Fig. 13 shows a plan view of the optical member 60B when a portion corresponding to region VI in Fig. 4 is viewed from the light-emitting module 10 side.

[0142] As shown in FIG. 13, an optical member 60B further includes communication portions 461 and 462, as compared with the optical member 60 according to the embodiment.

[0143] Each of the communicating portions 461 and 462 is an example of a second communicating portion extending from one of the multiple storage portions 62 to an edge of the substrate 11 in a plan view. Similar to the communicating portion 63, the communicating portions 461 and 462 are spaces formed by cutting out a part of the rear surface of the optical member 60B (i.e., the main surface facing the main surface 11a of the substrate 11).

[0144] 13, the communication portion 461 extends from the first accommodation portion 261 to the outer edge (side 17) of the substrate 11. The communication portion 462 extends from the second accommodation portion 262 to the inner edge (opening 12 side) of the substrate 11. Although an example is shown in which the communication portions 461 and 462 are provided in the third region 13c, this is not limiting. The communication portions 461 and 462 may be provided in at least one of the first region 13a and the second region 13b.

[0145] As described above, in the lighting device according to this modification, the optical member 60B further includes the communication portions 461 and 462 which are spaces extending from one of the multiple storage portions 62 to the edge of the substrate 11 in a planar view. Note that the communication portions 461 and 462 may extend to the edge of the optical member 60B in a planar view.

[0146] This can further improve convection within the housing portion 62, thereby suppressing a temperature rise due to heat generation from the light emitting element 21. Note that one of the communication portions 461 and 462 does not necessarily have to be provided.

[0147] (others) Although the lighting fixture according to the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment.

[0148] For example, each communication portion does not have to be a notch cut out from the rear surface of the optical member, and may be, for example, a through hole extending in a direction parallel to the rear surface of the optical member and connecting two adjacent housing portions.

[0149] Furthermore, for example, a rectangular substrate 11 with the tips of the four corners cut off has been exemplified as the substrate 11 of the light-emitting module 10, but the outer shape of the substrate 11 of the light-emitting module 10 in a planar view is not limited to this. For example, the outer shape of the substrate 11 in a planar view may be a polygonal shape other than a rectangle, such as a triangular shape or a pentagonal shape. Furthermore, the outer shape of the substrate 11 in a planar view may be a circle or an ellipse.

[0150] Furthermore, the substrate (module substrate) on which the multiple light-emitting elements 21 are arranged in the light-emitting module 10 does not have to be a single physical substrate like the substrate 11 according to the embodiment. For example, a single module substrate may be formed by connecting multiple substrates, each of which has one or more light-emitting elements 21 arranged thereon. For example, depending on the size required for the module substrate, it may be determined whether the module substrate is realized by a single substrate or by multiple substrates.

[0151] Furthermore, for example, the arrangement of the plurality of light-emitting elements 21 is not limited to the above-mentioned example. For example, the third element row 203, the fourth element row 204, and the fifth element row 205 do not have to be provided.

[0152] Furthermore, the substrate 11 of the light-emitting module 10 may be of a type other than the glass epoxy substrate and the composite substrate epoxy resin substrate (CEM-3) exemplified in the above embodiment. For example, a metal-based substrate made of a metal material with a resin-coated surface may be used. In this case, for example, heat from the plurality of light-emitting elements 21 and the plurality of circuit components 81 arranged on the main surface 11a of the substrate 11 is efficiently conducted to the fixture body 110 via the substrate 11.

[0153] Furthermore, power supply circuit 80, which supplies power for light emission to light-emitting unit 20, may be formed of a plurality of circuit components arranged on a board separate from board 11. Furthermore, power supply circuit 80 may be arranged outside lighting device 100. For example, power supply circuit 80 may be housed in a power supply box that supplies DC power to lighting device 100. This allows lighting device 100 to be made smaller and lighter, for example.

[0154] Furthermore, one or more circuit components 81 arranged on substrate 11 may form a different type of electric circuit (electronic circuit) from power supply circuit 80. For example, the one or more circuit components 81 may form a control circuit that controls dimming or color adjustment of multiple light-emitting elements 21 in accordance with a signal transmitted from outside lighting device 100. Furthermore, power supply circuit 80 may include the control circuit.

[0155] In addition, the light emitting element 21 is an SMD type LED element, but is not limited to this. For example, the light emitting module 10 may have a COB (Chip On Board) structure in which LED chips are directly mounted on the substrate 11. In this case, the LED chips mounted on the substrate 11 are collectively or individually sealed with a sealing member containing a wavelength conversion material, thereby making it possible to obtain illumination light with a predetermined color temperature.

[0156] In the above-described embodiment and modified example, an LED element in which an LED chip is packaged has been exemplified as the light-emitting element 21. However, a semiconductor light-emitting element such as a semiconductor laser, or another type of solid-state light-emitting element such as an organic EL (Electro Luminescence) or inorganic EL element may be adopted as the light-emitting element 21.

[0157] Furthermore, for example, the lighting fixture 100 may not include any components other than the fixture body 110 and the light-emitting module 10. For example, the lighting fixture 100 may not include the reflective sheet 40, the circuit cover 50, the optical member 60, the lighting cover 70, etc. The lighting fixture 100 may be realized as a lighting fixture other than a ceiling light.

[0158] In addition, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art may think of, and forms realized by arbitrarily combining the components and functions of each embodiment within the scope that does not deviate from the spirit of the present invention. [Explanation of symbols]

[0159] 10 Light Emitting Module 11, 11A board 11a Main surface 11c through hole 13a 1st area 13b Second area 13c 3rd area 17 sides 18 Corner 21, 21a, 211, 212, 213, 214 Light-emitting element 60, 60B Optical components 61, 61a Lens 62, 62a Storage section 63, 361, 362, 363, 365 Communication section (1st communication section) 80 Power circuit 81 Circuit Components 90 Equipment mounting part (mounting part) 100, 100A lighting fixtures 110, 110A Equipment body 112 Placement surface section 161 First Lens 162 Second lens 163, 164 Third lens 161a, 165a outer surface 201 First element row 202 Second element row 261 First Storage Unit 262 Second Storage Unit 263, 264 Third storage section 265 4th Storage Unit 461, 462 Communication part (second communication part)

Claims

1. The instrument body, A light emitting module having a substrate attached to the device body and a plurality of light emitting elements arranged on a main surface of the substrate; an optical member disposed on the main surface side of the light emitting module, The optical member is A plurality of accommodation portions each corresponding to the plurality of light emitting elements and serving as a space for accommodating the corresponding light emitting elements; A plurality of lenses each corresponding to the plurality of light emitting elements, and configured to emit light from the corresponding light emitting elements in a predetermined light distribution state; A first communication portion that is a space that communicates two adjacent storage portions among the plurality of storage portions, Lighting fixtures.

2. the first communication portion is a space formed by cutting out a part of a back surface of the optical member facing the main surface of the substrate, A cutout height of the first communication portion is equal to or greater than a height from the main surface of the light emitting element.

2. A lighting fixture according to claim 1.

3. The plurality of light-emitting elements include A plurality of first light emitting elements arranged in a ring shape along an outer shape of the substrate and constituting a first element row; a plurality of second light-emitting elements arranged in a ring shape inside the first element row and constituting a second element row; The plurality of storage sections include A plurality of first housings corresponding one-to-one to the plurality of first light emitting elements; a plurality of second housing portions corresponding one-to-one to the plurality of second light emitting elements; The first communication portion is provided between two adjacent second housing portions among the plurality of second housing portions.

3. A lighting device according to claim 1 or 2.

4. The substrate has a polygonal outer shape in a plan view, the plurality of light-emitting elements further includes a plurality of third light-emitting elements disposed between the first element row and the second element row, The main surface is a first region along an edge of the substrate; a second region closer to the corner of the substrate than the first region; The third light-emitting elements are arranged in the second region.

4. A lighting device according to claim 3.

5. The first communication portion is further provided between two adjacent first storage portions in the second region among the plurality of first storage portions.

5. A lighting device according to claim 4.

6. the plurality of containers include a plurality of third containers corresponding one-to-one to the plurality of third light-emitting elements, The first communication portion is further provided between the third housing portion and the first housing portion adjacent to each other in the second region.

6. A lighting device according to claim 4 or 5.

7. the main surface includes a third region located between the first region and the second region, the plurality of light-emitting elements include a fourth light-emitting element disposed between the first element row and the second element row in the third region, the plurality of containers include a fourth container corresponding to the fourth light-emitting element, The first communication portion is further provided between the fourth housing portion and at least one of the first housing portion and the second housing portion. A lighting fixture according to any one of claims 4 to 6.

8. the optical member further includes a second communication portion which is a space extending from one of the plurality of storage portions to an edge of the optical member or an edge of the substrate in a plan view; A lighting fixture according to any one of claims 1 to 7.

9. the substrate is provided with an opening penetrating the substrate in a thickness direction at a position overlapping the plurality of storage portions or the first communication portion in a plan view; A lighting fixture according to any one of claims 1 to 8.

10. The opening extends to an edge of the substrate in a plan view.

10. A lighting device according to claim 9.

11. The substrate is provided with a heat dissipation pattern formed of a metal material; The heat dissipation pattern overlaps the first communication portion in a plan view. A lighting fixture according to any one of claims 1 to 10.

12. The light emitting module further includes a power supply circuit disposed on the substrate and configured to supply power for light emission of the plurality of light emitting elements. A lighting device according to any one of claims 1 to 11.

13. Further, a mounting member is provided at a center of the device body for detachably mounting the device body to a ceiling, The plurality of light-emitting elements surround the fixture body in a plan view. A lighting device according to any one of claims 1 to 12.

Images