Lighting fixtures

Abstract

To provide a lighting apparatus capable of efficiently taking light emitted from a light emitting module to outside.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 160. The optical member 160 is arranged on the main face 11a side of the light emitting module 10, and has a plurality of lenses 161 corresponding to the plurality of light emitting elements 21 one by one. The optical member 160 has a lens arranging part 162 forming an area in which the plurality of lenses 161 is arranged when seen from the main face 11a side, and a plurality of plane parts 165 positioned on an outer side of the lens arranging part 162 and separated by the lens arranging part 162. Each of the plural plane parts 165 is arranged under a condition that an air layer 190 exists along a back face 166 which is a face of the plane part 165 opposed to the apparatus body 110.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a lighting device including a plurality of light-emitting elements arranged on a substrate. [Background technology]

[0002] Conventionally, ceiling lights, which are lighting fixtures arranged on a ceiling, have been known. For example, a ceiling light disclosed in Patent Document 1 includes a fixture body, a light-emitting module attached to the fixture body, a light-transmitting lens cover that covers the light-emitting module, and a light diffusion cover that covers the lens cover. The light-emitting module has a printed circuit board (hereinafter simply referred to as "board") and a plurality of light-emitting elements arranged on the board. The lens cover has a plurality of lenses that cover each of the plurality of light-emitting elements and control the light distribution of light emitted from the plurality of light-emitting elements. The lens cover controls the light distribution so that a large amount of light is emitted toward the center of the light diffusion cover in a plan view. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-181602 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional ceiling light, the outer part of the lens cover where the lenses are arranged is in surface contact with the surface of the substrate on which the light emitting devices are mounted. In this case, the light traveling to the outer part within the thickness of the lens cover is expected to be reflected by the surface of the substrate, but the light is absorbed by the surface. This is not preferable from the viewpoint of improving the efficiency of light extraction from the light emitting module.

[0005] The present invention was made by the inventors with a new focus on the above-mentioned problems, and has an object to provide a lighting device that can efficiently extract light emitted from a light-emitting module to the outside. [Means for solving the problem]

[0006] A lighting fixture according to one embodiment of the present invention comprises a fixture body, a light-emitting module having a substrate attached to the fixture body and a plurality of light-emitting elements arranged on a main surface of the substrate, and an optical element arranged on the main surface side of the light-emitting module and having a plurality of lenses in one-to-one correspondence with the plurality of light-emitting elements, wherein the optical element has, when viewed from the main surface side, a lens arrangement section that forms an area in which the plurality of lenses are arranged, and a plurality of planar sections located outside the lens arrangement section and separated by the lens arrangement section, and each of the plurality of planar sections is arranged with an air layer present along the back surface, which is the surface of the planar section facing the fixture body. Effect of the Invention

[0007] According to the present invention, it is possible to provide a lighting fixture capable of efficiently extracting light emitted from a light-emitting module to the outside. [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 of an optical member according to an embodiment. [Figure 6] FIG. 6 is a partial cross-sectional view showing a cross section of a part of a lighting device according to an embodiment. [Figure 7] FIG. 7 is a partial cross-sectional view showing a cross section of a part of a lighting device according to the first modification of the embodiment. [Figure 8] FIG. 8 is a partial cross-sectional view showing a cross section of a part of a lighting device according to the second modification of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments (including modified examples) of the lighting fixture according to the present invention will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement and connection of the components, and assembly process order shown in the following embodiments are merely examples and are not intended to limit the present invention.

[0010] The drawings may be schematic diagrams in which emphasis, omission, or ratio adjustment is appropriately performed to illustrate the present invention, that is, the actual shape, positional relationship, and ratio may differ. Furthermore, in the following embodiments, expressions indicating relative directions or attitudes, such as parallel and perpendicular, may be used, but these expressions may not strictly mean the directions or attitudes. For example, two directions being parallel not only means that the two directions are completely parallel, but also means that the two directions are substantially parallel, that is, that there is a difference of, for example, about several percent.

[0011] (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 and 6 to 8 described below.

[0012] As shown in FIG. 1, the lighting fixture 100 of the present embodiment is, for example, a ceiling light attached to a ceiling 4. The lighting fixture 100 according to the present embodiment includes a fixture body 110 and a light-emitting module 10 attached to the fixture body 110. 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, and the plurality of circuit components 81 constitute a power supply circuit 80. The lighting fixture 100 further includes a reflective sheet 40 arranged along the light-emitting module 10, a circuit cover 150, an optical member 160 having a plurality of lenses 161, a lighting cover 140, and a fixture attachment portion 8. A decorative plate 141 is attached to the outer periphery of the lighting cover 140.

[0013] [Fixture body] 1, the fixture body 110 is a disk-shaped member made of sheet metal such as an aluminum plate or a steel plate. The surface of the fixture body 110 on which the light-emitting module 10 and the like are arranged is coated with, for example, a white paint having a high light reflectance or a reflective metal material is vapor-deposited.

[0014] A circular opening is formed in the center of the fixture body 110, and a substantially cylindrical support part 119 (see FIG. 2) is disposed extending from the periphery of the opening towards the light emitting module 10. The support part 119 is a member made of, for example, resin, and has a structure that allows it to be fitted into the fixture attachment part 8. The fixture attachment part 8 is detachably attached to a ceiling side attachment member 9 installed on the ceiling 4. In other words, the fixture body 110 is detachably attached to the ceiling 4 via the fixture attachment part 8.

[0015] In the fixture body 110, a step portion 118 is formed around the support portion 119, and a mounting surface portion 112 is further formed outside the step portion 118. Also, a peripheral portion 113 that protrudes in the positive direction of the Z axis beyond 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.

[0016] [Light emitting module] As shown in FIG. 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 has a polygonal outer shape in a plan view (from the main surface 11a side of the substrate 11), and a circular opening 12 is formed in the center. The substrate 11 is expressed, for example, as a rectangle (hereinafter, simply referred to as a "rectangle") with the tips of the four corners cut off. The substrate 11 is a so-called printed circuit board on which a pattern of metal wiring is formed, and in this embodiment, a resin substrate on one side of which a conductor pattern (metal wiring) is provided is adopted 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).

[0017] 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.

[0018] The plurality of light-emitting elements 21 are arranged in multiple rings around the opening 12 of the substrate 11, as shown in FIG. 2, for example. The light-emitting section 20 in the light-emitting module 10 is configured by the plurality of light-emitting elements 21 arranged in multiple rings in this manner. There is no particular limitation on the manner of electrical connection of the plurality of light-emitting elements 21. For example, a plurality of 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 the plurality of light-emitting element groups may be connected in parallel. Alternatively, all of the plurality of light-emitting elements 21 may be connected in series.

[0019] A plurality of circuit components 81 are arranged in a region of 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 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.

[0020] 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 configuration similar to that of the light-emitting element 21. The color temperature of the light emitted by the night light 30 is, for example, an incandescent color, but may also be a daylight color. A bullet-shaped LED may also be used as the night light 30. An insulating cover 50 (see FIG. 2) and a part of an optical member 160 described later are arranged on the front side (the Z-axis positive direction side) of the night light 30.

[0021] [Circuit cover] The circuit cover 150 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 150 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 150. This allows the inner surface of the circuit cover 150 to be closer to the circuit components 81 inside the circuit cover 150, and as a result, the height (width in the Z-axis direction) of the circuit cover 150 can be reduced. Furthermore, the circuit cover 150 may be made of, for example, a flame-retardant resin instead of a metal. This allows, for example, the circuit cover 150 to be made smaller or lighter.

[0022] In this embodiment, the circuit cover 150 is attached to the fixture body 110 together with the optical member 160 and the light emitting module 10 by, for example, a plurality of screws (not shown).

[0023] [Optical components] 2, the optical member 160 is a light-emitting unit cover that covers the light-emitting unit 20 of the light-emitting module 10. The optical member 160 is formed using a translucent (e.g., transparent) resin material such as a transparent acrylic resin. In a plan view, the optical member 160 has a circular outer shape with a hole (opening 164) in the center, that is, has a shape generally called a doughnut shape.

[0024] The optical member 160 has a lens arrangement section 162 in which a plurality of lenses 161 are arranged, four flat sections 165, and an outer edge section 169 provided on the outer edge of the optical member 160. The plurality of lenses 161 included in the lens arrangement section 162 are provided in one-to-one correspondence with the plurality of light-emitting elements 21. The lenses 161, for example, expand the light distribution angle of the light from the corresponding light-emitting element 21. That is, the lenses 161 have a function of diverging light. In this way, by arranging the lenses 161 in correspondence with each of the light-emitting elements 21, for example, the diffusion of light from each of the plurality of light-emitting elements 21 can be precisely controlled.

[0025] Thus, the optical member 160 has a lens arrangement section 162 having a plurality of lenses 161, the lens arrangement section 162 being provided at a position overlapping with the light-emitting section 20 in a plan view, and a flat section 165 being an excess section extending outward beyond the light-emitting section 20 in a plan view. The lighting device 100 according to this embodiment is configured to utilize the flat section 165 so that light emitted by the light-emitting module 10 can be efficiently extracted to the outside. In addition, a reflective sheet 40 is disposed between the optical member 160 and the substrate 11 of the light-emitting module 10 to improve the light extraction efficiency. Details of the optical member 160 and its surrounding structure will be described later with reference to Figs. 3 to 8.

[0026] [Lighting cover] The lighting cover 140 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 140 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. The lighting cover 140 is detachably attached to the fixture body 110. In this embodiment, a circular decorative plate 141 that corresponds to the outer shape (circular shape) of the lighting cover 140 in a plan view is attached to the outer periphery of the lighting cover 140. The decorative plate 141 is fixed to the lighting cover 140 by a plurality of screws or the like (not shown). The lighting cover 140 is attached to and detached from the fixture body 110 with the decorative plate 141 fixed.

[0027] [Optical components and surrounding structures] Next, the structure of optical member 160 and its surroundings included in lighting device 100 according to the present embodiment will be described with reference to FIGS.

[0028] FIG. 3 is a perspective view showing a structural relationship between the light-emitting module 10 and the optical member 160 according to the embodiment. FIG. 4 is a plan view of the light-emitting module 10 according to the embodiment. FIG. 5 is a plan view of the optical member 160 according to the embodiment. In FIG. 5, the approximate outline of the substrate 11 is shown by a dotted line in order to compare the outline sizes of the optical member 160 and the substrate 11. FIG. 6 is a partial cross-sectional view showing a cross section of a part of the lighting device 100 according to the embodiment. In FIG. 6, a part of the cross section of the lighting device 100 in the XZ plane passing through the line VI-VI in FIG. 5 is simply illustrated, and illustration of members other than the device body 110, the optical member 160, the light-emitting module 10, and the circuit cover 150 is omitted.

[0029] 3, the optical member 160 according to the present embodiment has a plurality of lenses 161, each of which corresponds one-to-one with a plurality of light-emitting elements 21 arranged on the main surface 11a of the substrate 11. 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 of the lenses 161 (lens 161a in FIG. 3) is arranged in front of the light-emitting element 21 (positive direction of the Z axis). Light emitted by the light-emitting element 21a is diffused by the lens 161a and emitted forward (positive direction of the Z axis).

[0030] 3 to 5, the lenses 161 having such optical functions are disposed at positions facing each of the plurality of light-emitting elements 21 arranged in a multiple ring shape in the Z-axis direction. That is, in the lens arrangement portion 162 which is a part of the optical member 160, the plurality of lenses 161 are arranged in a multiple ring shape like the plurality of light-emitting elements 21, as shown in FIG.

[0031] As described above, the optical member 160 and the substrate 11 are fixed to the device body 110 together with the circuit cover 150 by a plurality of screws or the like. The device body 110 and the like are provided with a configuration for restricting the optical member 160 and the substrate 11 to the correct positions relative to the device body 110 during this fixing operation. Specifically, the device body 110 has a restricting protrusion 115 (see FIG. 2), and 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 160 is formed with a recess 168 (see FIGS. 3 and 5) into which the restricting protrusion 115 is inserted. The recess 168 is formed in a recessed 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).

[0032] That is, in this embodiment, the restricting protrusion 115 engages with the notch 19 of the substrate 11 and the recess 168 of the optical member 160. Furthermore, there are two such sets of the restricting protrusion 115, the notch 19, and the recess 168. This determines the positions and attitudes of the optical member 160 and the substrate 11 relative to the device body 110 to be normal positions and attitudes.

[0033] In the present embodiment, a reflection sheet 40 is disposed between the substrate 11 and the optical member 160 of the light-emitting module 10. The reflection sheet 40 is a sheet-like member formed of, for example, resin, and reflects light that travels directly and indirectly from the light-emitting element 21 toward the reflection sheet 40. Specifically, as shown in FIG. 3, the reflection sheet 40 has a plurality of through holes 41 that expose each of the plurality of light-emitting elements 21 to the side of the optical member 160. 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) that is located opposite to the light-emitting element 21a 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 travels toward the optical member 160 without being blocked by the reflection sheet 40. Furthermore, light traveling directly and indirectly from the light emitting elements 21a toward the reflective sheet 40 is reflected by the reflective sheet 40 and travels toward the optical member 160. That is, the reflective sheet 40 suppresses light loss between the light emitting elements 21a and the optical member 160. Furthermore, the reflective sheet 40 has a plurality of through holes 41 formed therein to expose the plurality of light emitting elements 21, and the above-described light loss suppression effect can be obtained for each of the plurality of light emitting elements 21.

[0034] In addition, in this embodiment, the reflection sheet 40 is formed with a plurality of through holes 41 such that, when the reflection sheet 40 is rotated 90° at a time around the Z axis from the attitude shown in Fig. 3, each of the plurality of light-emitting elements 21 can be inserted into the through hole 41 regardless of the rotation position. 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 attitude shown in Fig. 3.

[0035] That is, 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 convenience of 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 through holes 41 are provided only at positions corresponding to the multiple light-emitting elements 21 in the reflection sheet 40. 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, due to the rectangular outer shape, it may be complicated to align the reflection sheet 40, which is recognized as being rotationally symmetrical at every 90°, to the correct rotational position with respect to the fixture body 110.

[0036] 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. More specifically, the number and positions of the through holes 41 are determined so that when the reflection sheet 40 is rotated 90° around the center in a plan view, all the light emitting elements 21 arranged on the substrate 11 are exposed at any rotation position. 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, when the reflection sheet 40 is inverted around the X-axis or Y-axis, the number and positions of the through holes 41 are determined so that all the light emitting elements 21 arranged on the substrate 11 are exposed both before and 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 the assembly (manufacturing) of the lighting device 100.

[0037] The optical member 160 arranged on the main surface 11a side (the Z-axis positive direction side) of the substrate 11 with respect to the light-emitting module 10 and the reflection sheet 40 configured in this manner is provided with a lens arrangement section 162 and a planar section 165 as shown in Fig. 5. The optical member 160, which has a circular outer shape in a plan view, is larger than the substrate 11 (shown by a dotted line in Fig. 5), which has a non-circular outer shape in a plan view. Specifically, the optical member 160 is approximately the same size as the circumscribing circle of the substrate 11, which has a rectangular outer shape. In the optical member 160 having such a size and shape, the lens arrangement section 162 is formed to have a size and shape that covers the entire light-emitting section 20 of the light-emitting module 10.

[0038] In this embodiment, the light emitting unit 20 includes a plurality of light emitting elements 21 arranged along the periphery of the rectangular substrate 11, as shown in FIG. 4. Therefore, the lens arrangement section 162 covering the light emitting unit 20 is arranged up to the outer edge 169 of the optical member 160, as shown in FIG. 5, and has a rectangular outer shape. That is, the rectangular lens arrangement section 162 is provided so as to be inscribed in the outer shape of the optical member 160, which is circular in plan view, and the flat section 165 is provided outside the lens arrangement section 162. In other words, when only the direct light distribution control of the light from the light emitting unit 20 is considered, the optical member 160 only needs to have the lens arrangement section 162, and the outer shape is rectangular. However, in this embodiment, a circle of a size circumscribing the lens arrangement section 162 is adopted as the outer shape of the optical member 160 in plan view. As a result, a surplus portion that does not directly contribute to the light distribution control of the light from the light emitting unit 20 exists outside the lens arrangement unit 162 (on the side farther from the center of the optical member 160 in a planar view). In the present embodiment, this surplus portion is used as the flat portion 165.

[0039] Furthermore, the lens arrangement portion 162 projects out to a position that almost reaches the outermost edge of the optical member 160. Therefore, the flat surface portions 165 are not continuous in the circumferential direction, but are separated by the lens arrangement portion 162. Specifically, the flat surface portions 165 are arranged along each of the four sides of the outer shape of the rectangular lens arrangement portion 162.

[0040] More specifically, in the optical member 160 according to the present embodiment, an outer edge portion 169 is provided so as to surround the lens arrangement portion 162 and the four flat portions 165. As shown in FIG. 6, the outer edge portion 169 is a portion whose position in the thickness direction (Z-axis direction) of the flat portion 165 is different from that of the flat portion 165. In the present embodiment, the outer edge portion 169 is disposed at a position closer to the instrument body 110 than the flat portion 165, and therefore has a portion that is inclined (intersecting the XY plane) with respect to the flat portion 165 that is parallel to the XY plane. This improves, for example, the bending rigidity of the optical member 160. Note that the optical member 160 does not need to have the outer edge portion 169. In other words, the outer edge of the optical member 160 may be formed by the outer edges of the flat portion 165 and the lens arrangement portion 162 that are continuous in the circumferential direction.

[0041] In the optical member 160 configured in this manner, as shown in Fig. 6, an air layer 190 is provided along the back surface 166, which is the surface of the flat portion 165 facing the fixture body 110. Specifically, the flat portion 165 has the back surface 166 that is not in contact with the substrate 11 and the mounting surface portion 112 of the fixture body 110, and the air layer 190 is formed along the back surface 166. In this case, compared to a case in which another member such as the mounting surface portion 112 of the fixture body 110 is in contact (surface contact) with the back surface 166, the efficiency of extracting light to the front side (the main surface 11a side of the substrate 11) is improved by the amount of light not absorbed in the mounting surface portion 112.

[0042] More specifically, in the lens arrangement section 162, light is emitted to the outside from each of the multiple lenses 161, and at least a part of the light not emitted to the outside from the lens arrangement section 162 proceeds inside (within the thickness) of the flat section 165. A part of the light that has proceeded into the thickness of the flat section 165 is totally reflected at the interface between the back surface 166 and the air layer 190, and a part of the light passes through the interface and proceeds to the air layer 190. The light totally reflected at the interface is emitted to the outside from the front surface 167 of the flat section 165 directly or after being repeatedly reflected inside the flat section 165. The light emitted from the front surface 167 is emitted to the outside as part of the illumination light via the lighting cover 140 (see FIGS. 1 and 2). Furthermore, light that passes through the interface between back surface 166 and air layer 190 and travels into air layer 190 is reflected by mounting surface 112 of fixture body 110, and travels from the interface into the thickness of flat portion 165 either directly or after repeated reflections inside air layer 190. The light that travels from air layer 190 into the thickness of flat portion 165 is emitted to the outside from front surface 167 of flat portion 165 as described above, and is used as part of the illumination light.

[0043] In the above-mentioned light path, when the light that has traveled from the flat portion 165 into the air layer 190 is reflected by the mounting surface portion 112, at least a part of the light is absorbed by the mounting surface portion 112. However, since the light is reflected at the interface between the back surface 166 of the flat portion 165 and the air layer 190 by total reflection, no light loss occurs. On the other hand, assuming that the back surface 166 of the flat portion 165 is in surface contact with the mounting surface portion 112, some light is absorbed at the interface between the back surface 166 and the mounting surface portion 112. That is, at least a part of the light that travels toward the back surface 166 inside the flat portion 165 is absorbed by the mounting surface portion 112 that is in surface contact with the back surface 166. Therefore, unlike the optical member 160 according to this embodiment, the benefit of total reflection at the interface between the back surface 166 and the air layer 190 cannot be obtained.

[0044] In this embodiment, the air layer 190 also exists between the outer edge portion 169 of the optical member 160 and the device body 110. Therefore, the light that has traveled from the flat portion 165 or the lens arrangement portion 162 to the outer edge portion 169 can also benefit from the total reflection of the light at the interface between the outer edge portion 169 and the air layer 190. Furthermore, as shown in FIG. 6, an inclined surface portion 113a that connects the mounting surface portion 112 and the peripheral portion 113 is disposed at a position facing the end face of the outer edge portion 169. As a result, the light emitted to the outside from the end face of the outer edge portion 169 is reflected by the inclined surface portion 113a and travels forward (in the positive direction of the Z axis). In other words, the light that has reached the outer edge portion 169 in the optical member 160 is also efficiently extracted so as to be used as illumination light.

[0045] As described above, the lighting fixture 100 according to the present embodiment includes the fixture body 110, the light-emitting module 10 having the substrate 11 attached to the fixture body 110 and the plurality of light-emitting elements 21 arranged on the main surface 11a of the substrate 11, and the optical member 160. The optical member 160 is arranged on the main surface 11a side of the light-emitting module 10 and has a plurality of lenses 161 that correspond one-to-one to the plurality of light-emitting elements 21. When viewed from the main surface 11a side, the optical member 160 has a lens arrangement section 162 that forms an area in which the plurality of lenses 161 are arranged, and a plurality of planar sections 165 that are located outside the lens arrangement section 162 and are separated by the lens arrangement section 162. Each of the plurality of planar sections 165 is arranged with an air layer 190 present along a back surface 166, which is the surface of the planar section 165 that faces the fixture body 110.

[0046] According to this configuration, when viewed from the main surface 11a side (plan view), light directed outward from the lens arrangement portion 162 of the optical member 160 proceeds to the planar portion 165. In the planar portion 165, the air layer 190 exists along the back surface 166 facing the fixture body 110, so that total reflection of light occurs at the interface between the back surface 166 of the planar portion 165 and the air layer 190. In other words, if another member such as the fixture body 110 is in surface contact with the back surface 166, light absorption by the other member does not occur. In other words, the configuration for extracting light using total reflection at the interface between the back surface 166 and the air layer 190 has less light loss than the configuration using diffuse reflection of another member such as the fixture body 110. As a result, the light extraction efficiency of the lighting fixture 100 is improved.

[0047] Furthermore, in this embodiment, the lens arrangement section 162 is arranged so as to separate the planar section 165. That is, the lens arrangement section 162 is provided up to the end of the optical member 160 in a planar view. Therefore, according to the optical member 160 of this embodiment, light to be used as illumination light is emitted not only from the lens arrangement section 162 that diffuses light from the multiple light-emitting elements 21, but also from a wide range including the planar section 165, which is another part. In this way, according to the lighting fixture 100 of this embodiment, the light emitted by the light-emitting module 10 can be efficiently extracted to the outside.

[0048] In the present embodiment, the substrate 11 has a non-circular outer shape when viewed from the main surface 11a side. The optical member 160 is larger than the substrate 11 and has a circular outer shape when viewed from the main surface 11a side.

[0049] That is, in plan view, because substrate 11 is non-circular and optical member 160 is circular and larger than substrate 11, optical member 160 has a surplus portion that does not face multiple light-emitting elements 21 (light-emitting section 20). In this embodiment, the surplus portion is utilized as planar section 165 that can efficiently extract light. As a result, lighting device 100 according to this embodiment can obtain a light-emitting surface (light-emitting area) that is close to circular while using non-circular substrate 11.

[0050] More specifically, substrate 11 according to this embodiment has a polygonal outer shape when viewed from main surface 11a.

[0051] With this configuration, the substrate 11 can be manufactured efficiently. For example, when a substrate has a circular outer shape, the number of substrates (yield) obtained by cutting out the substrate from one base material is relatively small, which means that there is a lot of wasted material in the base material. Of course, if a circular substrate is made up of multiple small substrates arranged in the circumferential direction, the amount of wasted material in the base material will be reduced. However, in this case, other problems arise, such as the manufacturing process becoming more complicated and the manufacturing costs increasing. Therefore, in order to efficiently obtain multiple substrates from one base material, it is preferable that the substrate has a polygonal shape, such as a rectangle.

[0052] Therefore, in the lighting device 100 according to the present embodiment, the substrate 11 used in the light-emitting module 10 has a polygonal outer shape (more specifically, a rectangular shape with the tips of the four corners cut off). This improves the manufacturing efficiency of the lighting device 100 or reduces the manufacturing cost. In addition, when the lighting device 100, which is circular in plan view, uses the polygonal substrate 11, for example, a problem may occur in that the approximate shape of the light-emitting surface (light-emitting region) that emits illumination light does not match the outer shape of the lighting device 100. In this regard, in the lighting device 100 according to the present embodiment, the planar portion 165 is provided in the optical member 160, which has a circular outer shape, so as to fill in the portion where the lens arrangement portion 162 is not present, and therefore, as described above, a light-emitting surface (light-emitting region) having a shape close to a circle can be obtained.

[0053] In the present embodiment, the light emitting module 10 further includes a power supply circuit 80 that is disposed on the substrate 11 and supplies power to the multiple light emitting elements 21 for light emission.

[0054] According to this configuration, simply by attaching one board 11 to the fixture body 110, the incorporation of the multiple light-emitting elements 21 (light-emitting units 20) that are the light source of illumination light into the lighting fixture 100 and the incorporation of the power supply circuit 80 that is the power supply source for light emission into the lighting fixture 100 can be completed. In other words, it is possible to efficiently manufacture the lighting fixture 100 that can efficiently extract the light emitted by the light-emitting module 10 to the outside.

[0055] Although the lighting device 100 according to the present embodiment has been described above, the configuration of the optical member 160 included in the lighting device 100 is not limited to the configuration described in the above embodiment. Therefore, modifications of the optical member 160 will be described below, focusing on the differences from the above embodiment.

[0056] (Variation 1) 7 is a partial cross-sectional view showing a cross section of a portion of lighting device 100a according to Modification 1 of the embodiment. The position of the cross section in FIG. 7 corresponds to the position of the cross section in FIG.

[0057] As shown in FIG. 7, the lighting device 100a according to this modification includes a light-emitting module 10 and an optical member 160a arranged on the principal surface 11a side of the light-emitting module 10. The optical member 160a has a lens arrangement section 162 forming an area in which the plurality of lenses 161 are arranged, and a planar section 165a located outside the lens arrangement section 162. The positional relationship between the lens arrangement section 162 and the planar section 165a is the same as the positional relationship between the lens arrangement section 162 and the planar section 165 according to the embodiment. That is, when viewed from the principal surface 11a side, the optical member 160a has the lens arrangement section 162 forming an area in which the plurality of lenses 161 are arranged, and a plurality of planar sections 165a located outside the lens arrangement section 162 and separated by the lens arrangement section 162. Each of the plurality of planar sections 165a is arranged with an air layer 190 present along a back surface 166a, which is the surface of the planar section 165a facing the device body 110. These configurations are common to lighting fixture 100 according to the embodiment.

[0058] In this modification, the planar portion 165a is provided on the optical member 160a in an inclined position with respect to the lens arrangement portion 162, and in this respect, the lighting device 100a according to this modification differs from the lighting device 100 according to the embodiment. More specifically, in this modification, the planar portion 165a is inclined in a direction facing the center of the lighting device 100a in a plan view. As a result, the front surface 167a of the planar portion 165a is directed slightly inward rather than directly ahead. As a result, the light emitted from the planar portion 165a tends to gather at the center of the lighting device 100a in a plan view. This makes it possible to brighten the central portion of the lighting cover 140 (see FIGS. 1 and 2) in appearance. This configuration is advantageous when it is desired to brighten the area directly below the lighting device 100a attached to the ceiling 4, for example.

[0059] (Variation 2) 8 is a partial cross-sectional view showing a cross section of a portion of lighting device 100b according to Modification 2 of the embodiment. The position of the cross section in FIG. 8 corresponds to the position of the cross section in FIG.

[0060] As shown in FIG. 8, the lighting device 100b according to this modification includes a light-emitting module 10 and an optical member 160b arranged on the principal surface 11a side of the light-emitting module 10. The optical member 160b has a lens arrangement section 162 forming an area in which the plurality of lenses 161 are arranged, and a planar section 165b located outside the lens arrangement section 162. The positional relationship between the lens arrangement section 162 and the planar section 165b is the same as the positional relationship between the lens arrangement section 162 and the planar section 165 according to the embodiment. That is, when viewed from the principal surface 11a side, the optical member 160b has the lens arrangement section 162 forming an area in which the plurality of lenses 161 are arranged, and a plurality of planar sections 165b located outside the lens arrangement section 162 and separated by the lens arrangement section 162. Each of the plurality of planar sections 165b is arranged with an air layer 190 present along a back surface 166b, which is the surface of the planar section 165b facing the device body 110. These configurations are common to lighting fixture 100 according to the embodiment.

[0061] In this modification, the planar portion 165b is provided on the optical member 160b in an inclined position with respect to the lens arrangement portion 162, and in this respect, the lighting device 100b according to this modification is different from the lighting device 100 according to the embodiment. Specifically, in this modification, the planar portion 165b is inclined toward the radially outward direction of the lighting device 100b, which is circular in plan view. As a result, the front surface 167b of the planar portion 165b is directed slightly outward rather than directly forward. As a result, the light emitted from the planar portion 165b is likely to gather on the outer periphery side of the lighting device 100b in plan view. This makes it possible to brighten the peripheral portion of the lighting cover 140 (see FIGS. 1 and 2) in appearance. This configuration is advantageous when it is desired to brighten a wide range, including directly below the lighting device 100b attached to the ceiling 4, for example.

[0062] (Other embodiments) Although the present invention has been described above based on the embodiment and its modifications, the present invention is not limited to the above embodiment and its modifications.

[0063] For example, the substrate 11 of the light-emitting module 10 is shown as a rectangular substrate 11 with the tips of the four corners cut off, but the outer shape of the substrate 11 of the light-emitting module 10 in plan view is not limited to this. For example, the outer shape of the substrate 11 in plan view may be a polygonal shape other than a rectangle, such as a triangular shape or a pentagonal shape, or may be a non-circular shape different from a polygonal shape, such as an elliptical shape or an oblong shape. For example, assume that an optical member having a diameter approximately equal to the longitudinal length of the substrate 11 is arranged on the main surface 11a side of the substrate 11 with respect to the substrate 11 having an oblong shape. In this case, a lens arrangement section is provided in the portion of the optical member overlapping with the substrate 11, and a flat portion is provided in the portion other than the lens arrangement section. In other words, an optical member having two flat portions separated to the left and right by the lens arrangement section in plan view is arranged on the substrate 11. Even in this case, a light-emitting surface (light-emitting area) having a shape close to a circle in plan view can be obtained by the light diffusion effect of the multiple lenses of the lens arrangement section and the light guide effect of the two flat portions.

[0064] In addition, the air layer 190 existing along the back surface 166 of the flat portion 165 does not have to be formed by a gap between the back surface 166 and the device body 110. For example, when the size of the substrate 11 is relatively large, the air layer 190 may be formed by a gap between the back surface 166 of the flat portion 165 and the main surface 11a of the substrate 11.

[0065] Furthermore, a plurality of prisms may be provided on rear surface 166 of planar portion 165 for efficiently reflecting light toward front surface 167. A plurality of prisms may be provided on front surface 167 of planar portion 165 for efficiently extracting light heading toward front surface 167 inside planar portion 165 from front surface 167.

[0066] 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.

[0067] 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.

[0068] Furthermore, power supply circuit 80 that supplies power for light emission to light-emitting unit 20 may be configured with 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.

[0069] 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.

[0070] 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 be a COB (chip on board) in which an LED chip is directly mounted on the substrate 11. In this case, a plurality of LED chips mounted on the substrate 11 can be encapsulated collectively or individually with an encapsulating member containing a wavelength converting material, thereby making it possible to obtain illumination light with a predetermined color temperature.

[0071] 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, other types of solid-state light-emitting elements, such as a semiconductor light-emitting element such as a semiconductor laser, or an EL element such as an organic EL (Electro Luminescence) or an inorganic EL, may be adopted as the light-emitting element 21.

[0072] In addition, the present invention also includes forms obtained by applying various modifications to the above-described embodiments and their modifications that would come to mind by a person skilled in the art, and forms realized by arbitrarily combining the components and functions of each embodiment and its modifications without departing from the spirit of the present invention. [Explanation of symbols]

[0073] 11 Substrate 11a Main surface 11b Back side 20 Light emitting part 21, 21a Light emitting element 80 Power circuit 81 Circuit Components 100, 100a, 100b Lighting fixtures 110 Equipment body 112 Mounting surface 113 Periphery 113a Slope section 160, 160a, 160b Optical member 161, 161a Lens 162 Lens placement section 165, 165a, 165b flat part 166, 166a, 166b back 167, 167a, 167b front 169 Outer edge 190 Air Layer

Claims

1. The instrument body, a light-emitting module having a substrate attached to the device body and a plurality of light-emitting elements disposed on a main surface of the substrate; an optical member disposed on the main surface side of the light emitting module and having a plurality of lenses corresponding one-to-one to the plurality of light emitting elements; the optical member has, when viewed from the main surface side, a lens arrangement section that forms an area in which the plurality of lenses are arranged, and a plurality of planar sections that are located outside the lens arrangement section and are separated by the lens arrangement section, Each of the plurality of planar portions is arranged with an air layer existing along a back surface of the planar portion that faces the instrument body, When viewed from the main surface side, the lens arrangement section forms the rectangular region, and a corner of the region is disposed at a position that reaches an outer edge of the optical member, so that the plurality of planar portions are disposed separately outside the lens arrangement section. Lighting fixtures.

2. the substrate has a non-circular outer shape when viewed from the main surface side, The optical member is larger than the substrate when viewed from the main surface side, and has a circular outer shape.

2. A lighting device according to claim 1.

3. The substrate has a polygonal outer shape when viewed from the main surface side.

3. A lighting device according to claim 2.

4. The light emitting module further includes a power supply circuit disposed on the substrate and supplying power for emitting light to the plurality of light emitting elements. A lighting fixture according to any one of claims 1 to 3.

5. An instrument body, a light-emitting module having a substrate attached to the device body and a plurality of light-emitting elements disposed on a main surface of the substrate; an optical member disposed on the main surface side of the light emitting module and having a plurality of lenses corresponding one-to-one to the plurality of light emitting elements; the optical member has, when viewed from the main surface side, a lens arrangement section that forms an area in which the plurality of lenses are arranged, and a plurality of planar sections that are located outside the lens arrangement section and are separated by the lens arrangement section, Each of the plurality of planar portions is arranged with an air layer existing along a back surface of the planar portion that faces the instrument body, the planar portion is provided on the optical member in an inclined position with respect to the lens arrangement portion, Lighting fixtures.

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