Lighting fixtures and light sources

Abstract

To provide a lighting fixture that makes it easier to increase the luminous intensity of the light emitted from the lighting fixture in the vertical direction towards the center. [Solution] The lighting fixture 1 comprises a substrate 15, a plurality of solid-state light-emitting elements mounted on the substrate 15 so as to surround the central part in an orthogonal direction perpendicular to the height direction, one or more optical members 55 arranged on the light-emitting side of one or more solid-state light-emitting elements included in the plurality of solid-state light-emitting elements, and a translucent cover arranged on the light-emitting side of the plurality of solid-state light-emitting elements. The one or more optical members 55 includes one or more asymmetric optical members. With respect to the luminous intensity distribution in a cross section including the center in an orthogonal direction to the optical axis of the light emitted from the corresponding solid-state light-emitting element, the angle of the emission direction of the first peak of light toward the center with respect to the light-emitting side direction of the optical axis is smaller than the angle of the emission direction of the second peak of light toward the periphery with respect to the light-emitting side direction.

Description

【Technical Field】 【0001】 The present disclosure relates to a lighting fixture and a light source. 【Background Art】 【0002】 Conventionally, as a lighting fixture, there is a ceiling light described in Patent Document 1. This ceiling light includes a base plate, a substrate fixed to the base plate and having a substantially square outer edge, a plurality of LEDs mounted on the substrate, and a diffusion cover that covers the light emission side of the plurality of LEDs and has a substantially circular plan view when viewed from the height direction. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2019-129103 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 When a plurality of LEDs are mounted on a substrate so as to surround the central portion in the orthogonal direction orthogonal to the height direction of the lighting fixture, for example, in the case of a lighting fixture having a substantially circular plan view when viewed from the lower side in the height direction, since no LED is mounted at the central portion of the substrate, the luminous intensity of the light on the central side tends to be smaller than the luminous intensity of the light on the outer edge side with respect to the emitted light emitted from the lighting fixture in its height direction. Therefore, an object of the present disclosure is to provide a lighting fixture and a light source that can easily increase the luminous intensity of the light on the central side with respect to the emitted light emitted from the lighting fixture in its height direction. 【Means for Solving the Problems】 【0005】 To solve the above problems, the lighting fixture according to the present disclosure comprises a substrate, a plurality of solid-state light-emitting elements mounted on the substrate so as to surround the central part in an orthogonal direction perpendicular to the height direction, one or more optical members disposed on the light-emitting side of one or more solid-state light-emitting elements included in the plurality of solid-state light-emitting elements, and a translucent cover disposed on the light-emitting side of the plurality of solid-state light-emitting elements, wherein the one or more optical members include one or more asymmetric optical members, and with respect to the luminous intensity distribution in a cross section including the center in an orthogonal direction to the optical axis of the corresponding solid-state light-emitting element for light emitted from the asymmetric optical member, the angle of the emission direction of the first peak of light toward the center with respect to the light-emitting side direction of the optical axis is smaller than the angle of the emission direction of the second peak of light toward the periphery with respect to the light-emitting side direction of the optical axis. 【0006】 Furthermore, the light source according to this disclosure comprises a solid-state light-emitting element and an asymmetric optical member disposed on the light-emitting side of the solid-state light-emitting element, wherein the inner surface on the light-incident side of the asymmetric optical member includes a concave portion that is convex on the light-emitting side, and there exist a first cross-section and a second cross-section that satisfy the condition that in a first cross-section including the optical axis of the light emitted from the solid-state light-emitting element, the outer surface on the light-emitting side of the asymmetric optical member is asymmetric with respect to the optical axis, while in a second cross-section that includes the optical axis and is perpendicular to the first cross-section, the outer surface is substantially symmetric with respect to the optical axis. [Effects of the Invention] 【0007】 According to the lighting fixture and light source described herein, it is easier to increase the luminous intensity of the light on the central side with respect to the emitted light emitted from the lighting fixture in the vertical direction. [Brief explanation of the drawing] 【0008】 [Figure 1] This is a perspective view of a lighting fixture according to one embodiment of the present disclosure, as seen from a diagonally downward angle. [Figure 2] This is a perspective view of the lighting fixture with the diffuser cover removed, seen from a diagonal downward angle. [Figure 3]This is a perspective view of the lighting fixture from a diagonal downward angle, with the protective cover that further protects the electronic components removed from the state shown in Figure 2. [Figure 4] This is a perspective view showing the state after the translucent resin sheet covering the substrate has been removed from the state shown in Figure 3. [Figure 5] This is a perspective view showing the state after the reflective sheet has been removed from the state shown in Figure 4. [Figure 6] This is a plan view of the resin sheet as seen from below in the height direction. [Figure 7] This is a plan view of the reflective sheet as seen from below in the height direction. [Figure 8] This is a plan view of a circuit board on which multiple electronic components and multiple solid-state light-emitting elements are mounted, as seen from below in the height direction. [Figure 9] This is a cross-sectional view of an optical component, and is a cross-sectional view of a first cross-section that includes the optical axis and radial direction of light emitted from a solid-state light-emitting element corresponding to the optical component. [Figure 10] This is a cross-sectional view of an optical component, wherein the second cross-section includes the optical axis of light emitted from a solid-state light-emitting element corresponding to the optical component and is perpendicular to the first cross-section. [Figure 11] The solid line shows the relationship between the irradiation angle and luminous intensity of light emitted from the optical component in the first cross-section, and the dotted line shows the relationship between the irradiation angle and luminous intensity of light emitted from the optical component in the second cross-section. [Figure 12] This is a cross-sectional view of a lighting fixture showing the direction from which strong light is emitted from a single solid-state light-emitting element. [Figure 13] This figure shows the luminous intensity distribution of the light emitted directly below the lighting fixture in the example. [Figure 14] This figure shows the luminous intensity distribution of the light emitted directly below the lighting fixture in the above embodiment. [Modes for carrying out the invention] 【0009】 The embodiments relating to this disclosure will be described in detail below with reference to the attached drawings. Note that if multiple embodiments or modifications are included below, it is intended from the outset that new embodiments may be constructed by appropriately combining their characteristic features. In the following embodiments, the same reference numerals are used for the same components in the drawings, and redundant explanations are omitted. Furthermore, multiple drawings include schematic diagrams, and the dimensional ratios such as length, width, and height of each component do not necessarily match between different drawings. The numerous components described below include several optional components that are not essential. Also, in this specification, the term "omitted" may be used to allow for manufacturing tolerances (manufacturing variations), and may be used to describe the general shape of components, etc. 【0010】 In the following description, when terms related to the vertical direction such as down, up, lower side, and upper side are used, they indicate the direction when the lighting fixture 1 is installed on the ceiling. Also, when the height direction is mentioned in the following description, that height direction refers to the height direction of the lighting fixture 1, and when the orthogonal direction is mentioned, that orthogonal direction refers to the direction perpendicular to the height direction. In this embodiment, the lighting fixture 1 is installed on the ceiling with its height direction approximately coinciding with the vertical direction. 【0011】 The lighting fixture 1 of the embodiment has a shape that allows the center and radial direction to be identified in a plan view when viewed from the height direction. More specifically, the diffusion cover 50 of the embodiment has a dome shape and a substantially circular shape in a plan view when viewed from below in the height direction. In the following description, when "radial direction" is mentioned, it refers to the radial direction of the diffusion cover 50; when "inside" is mentioned, it refers to the radially inward side; and when "outside" is mentioned, it refers to the radially outward side. 【0012】 FIG. 1 is a perspective view of a lighting fixture 1 according to an embodiment of the present disclosure when viewed from obliquely below. The lighting fixture 1 is a ceiling light and is attached to the ceiling of a building. Although it is a well-known structure and will not be described in detail, the lighting fixture 1 includes an adapter (not shown) that is attached to a fixture attachment portion (not shown) provided on the ceiling of the building. Further, the lighting fixture 1 includes a base member 10 that is stationary with respect to the adapter and is arranged along the ceiling substantially parallel to the ceiling, a light emitting portion 20 (see FIGS. 4 and 5) that is stationary with respect to the base member 10, and a diffusion cover 50 that is arranged so as to cover the light emitting portion 20 and constitutes a light-transmissive cover. 【0013】 The base member 10 is made of metal or resin. The diffusion cover 50 has a dome shape convex downward and has a substantially circular shape in plan view when viewed from the lower side in the height direction. The diffusion cover 50 is made of a light-transmissive resin material, for example, polycarbonate, acrylic, or silicon, etc., and diffuses the light from the light emitting portion 20 and emits it downward. In the present embodiment, the light emitting portion 20 emits light based on the power supplied from the outside via the adapter, but the light emitting portion 20 may emit light based on the power supplied without passing through the adapter from the outside. 【0014】 FIG. 2 is a perspective view of the lighting fixture 1 with the diffusion cover 50 removed when viewed from obliquely below. As shown in FIG. 2, the lighting fixture 1 has a plurality of receivers 40 that are attached to the lower surface 10a of the base member 10 in a state of being arranged at substantially equal intervals in the circumferential direction by screws or the like. The receiver 40 has a recess 41 that opens outward in the radial direction. The radial direction is an example of an orthogonal direction. The diffusion cover 50 has a plurality of protrusions (not shown) that protrude radially inward on the inner peripheral surface of the upper edge portion. The plurality of protrusions are arranged at substantially equal intervals in the circumferential direction on the diffusion cover 50. A part of the inner surface of the recess 41 is defined by a locking portion (not shown) that protrudes outward in the radial direction to lock the protrusion. 【0015】 With the circumferential position of the protrusion being different from the circumferential position of the receiving member 40, the diffusion cover 50 is brought into contact with the lower surface of the base member 10 so as to cover the plurality of receiving members 40. Then, when the diffusion cover 50 is relatively rotated in one circumferential direction with respect to the base member 10, the diffusion cover 50 elastically deforms radially outward, so that the tapered tip of the protrusion gets over the locking portion and the protrusion fits into the recess 41. By this fitting, the protrusion is locked to the locking portion, and the diffusion cover 50 is fixed to the plurality of receiving members 40. 【0016】 FIG. 3 is a perspective view of the lighting fixture 1 when viewed obliquely from the lower side with the protective cover 45 for further protecting the electronic component 5 removed from the state shown in FIG. 2. As shown in FIG. 3, the lighting fixture 1 has a substrate 15 fixed to the lower surface 10a of the base member 10 by fixing means, such as screws or an adhesive, at the central portion on the radially inner side (in the example shown in FIG. 4, a circular central portion). A plurality of electronic components 5 constituting a control device and a power supply device are mounted in a region surrounding the central portion on the lower surface (mounting surface) 15a of the substrate 15. The power supply device converts external AC power into DC power and steps it down to an appropriate voltage. The control device controls lighting and extinguishing of the lighting fixture 1. 【0017】 For example, when the control device receives a wireless signal indicating lighting from a remote control (not shown), it controls the switching portion for controlling the light source mounted on the power supply device to be turned on, while when it receives a wireless signal indicating extinguishing from the remote control, it controls the switching portion for controlling the light source to be turned off. By the on-control, power is supplied to the light source and light is emitted from the solid light-emitting element (see FIG. 4) 30, while by the off-control, the power to the light source is cut off and light is no longer emitted from the solid light-emitting element 30. The switching portion is constituted by, for example, a transistor or the like. 【0018】 Figure 4 is a perspective view showing the state in which the translucent resin sheet 35 covering the substrate 15 has been removed from the state shown in Figure 3. As shown in Figure 4, the light-emitting section 20 comprises a plurality of solid-state light-emitting elements 30. The lighting fixture 1 also has a reflective sheet 25. The reflective sheet 25 is sandwiched between the substrate 15 and the resin sheet 35. The reflective sheet 25 is a sheet-like material with a higher reflectivity to light than the substrate 15, and reflects light that goes directly from the solid-state light-emitting elements 30 to the reflective sheet 25, as well as light that goes indirectly from the solid-state light-emitting elements 30 to the reflective sheet 25. Examples of the reflective sheet 25 include a metal sheet mainly composed of aluminum, a resin sheet with a metal vapor-deposited film of silver, aluminum, etc. The reflective sheet 25 plays a role in increasing the light extraction efficiency of each solid-state light-emitting element 30. Through holes 25c (see Figure 7) are provided at the positions where each solid-state light-emitting element 30 is positioned in the reflective sheet 25. Note that the lighting fixture of this disclosure does not necessarily have a reflective sheet. 【0019】 Figure 5 is a perspective view showing the state in which the reflective sheet 25 has been removed from the state shown in Figure 4. As shown in Figure 5, the substrate 15 has a substantially square outer edge 15b and a cylindrical hole 15c in the center. Here, a substantially square is a shape whose general shape is a square, and a substantially square includes shapes in which the corners are notched by chamfering or the like compared to a square, and also includes shapes in which at least one of a recess and a convex is provided at one or more locations on the outer edge of the side. In this embodiment, the substrate 15 has a substantially square outer edge 15b, but in the lighting fixture of this disclosure, the substrate may have an outer edge other than a substantially square outer edge, for example, a substantially rectangular outer edge, a substantially circular outer edge, or a substantially elliptical outer edge. As shown in Figure 3, the light-emitting side of the substrate 15 is covered with a translucent resin sheet 35. The resin sheet 35 is formed by injection molding, for example, and is made of polycarbonate, acrylic, or silicone. 【0020】 As shown in Figure 5, multiple solid-state light-emitting elements 30 are mounted on the substrate 15 so as to surround its central part (cylindrical hole 15c). The multiple solid-state light-emitting elements 30 are arranged around the multiple electronic components 5 so as to surround them. In this embodiment, the solid-state light-emitting elements 30 are composed of LED (light-emitting diode) chips. However, the solid-state light-emitting elements 30 may be composed of semiconductor laser element chips or the like, or of semiconductor light-emitting elements other than LED chips. Alternatively, the solid-state light-emitting elements 30 may be composed of organic EL (Electro-Luminescence) elements or inorganic EL elements or the like. 【0021】 Figure 6 is a plan view of the resin sheet 35 as seen from below in the height direction, and Figure 7 is a plan view of the reflective sheet 25 as seen from below in the height direction. Figure 8 is a plan view of the substrate 15 on which multiple electronic components 5 and multiple solid-state light-emitting elements 30 are mounted, as seen from below in the height direction. As shown in Figures 6 and 8, the resin sheet 35 is substantially similar to the substrate 15 when viewed from the height direction, and has a substantially square shape that is larger than the substrate 15. Also, as shown in Figure 7, the reflective sheet 25 has a cylindrical hole 25a in the center, and notches 25b located at intervals in the circumferential direction communicate with the cylindrical hole 25a. 【0022】 As shown in Figure 2, the protective cover 45 defines a donut-shaped chamber with its lower side sealed in the height direction, and has a plurality of protrusions 45a arranged at circumferential intervals around the periphery of its upper end, projecting radially outward. The protrusions 45a have through holes 45b that extend in the height direction. When viewed from the height direction, the protrusions 45a have a planar shape corresponding to the notch 25b (see Figure 7) and are housed within the notch 25b. The protective cover 45 is screw-fixed to the base member 10 with the substrate 15 sandwiched between the through holes 45b. 【0023】 As shown in Figure 6, the resin sheet 35 includes a cylindrical hole 35a corresponding to the cylindrical hole 15c of the substrate 15 and a notch 35b corresponding to the notch 25b of the reflective sheet 25. The resin sheet 35 is screw-fixed to the base member 10 in such a state that the notch 35b overlaps the notch 25b when viewed from the height direction. In this embodiment, the resin sheet 35 is screw-fixed to the base member 10, but it may also be fixed to the outer edge of the substrate 15 by fixing means such as screws or adhesive. 【0024】 As shown in Figures 6 and 8, the resin sheet 35 has the same number of optical members 55 as the number of solid-state light-emitting elements 30. The optical members 55 are asymmetric optical members. In this embodiment, all optical members 55 are included in the resin sheet 35 and are integrally connected. The number of optical members 55 in the lighting fixture 1 matches the number of solid-state light-emitting elements 30 in the lighting fixture 1. Each optical member 55 is arranged so as to overlap one solid-state light-emitting element 30 when viewed from the height direction. The optical member 55 is a lens positioned on the light-emitting side of the solid-state light-emitting element 30. In this embodiment, all optical members 55 included in the resin sheet 35 are substantially identical. As shown in Figure 8, the multiple solid-state light-emitting elements 30 include three or more solid-state light-emitting elements 30 arranged in a staggered pattern. Also, as shown in Figure 6, the multiple optical members 55 also include three or more optical members 55 arranged in a staggered pattern. 【0025】 Figure 9 is a cross-sectional view of the optical member 55, and is a cross-sectional view in a first cross-section that includes the optical axis of the light emitted from the solid-state light-emitting element 30 corresponding to the optical member 55 and the radial direction as an example of a perpendicular direction. Figure 10 is a cross-sectional view of the optical member 55, and is a cross-sectional view in a second cross-section that includes the optical axis of the light emitted from the solid-state light-emitting element 30 corresponding to the optical member 55 and is perpendicular to the first cross-section. Figure 10 includes the optical axis and the tangential direction which is located in the same plane as the circumferential direction and is tangent to the circumferential direction. 【0026】 In Figure 9, arrow A indicates the direction from the inside to the outside in the radial direction, and arrow B indicates the direction of emission of the first peak of light toward the center, or in this embodiment, the radial center, with respect to the luminous intensity distribution in the first cross section (hereinafter simply referred to as the emission direction of the first peak). Arrow C indicates the direction of emission of the second peak of light toward the periphery, or in this embodiment, toward the radial outward direction, with respect to the luminous intensity distribution in the first cross section (hereinafter simply referred to as the emission direction of the second peak), and arrow D indicates the direction of light emission on the optical axis. In Figure 8, arrow D indicates the direction of light emission on the optical axis, and arrow E indicates the tangential direction. Arrow F indicates the direction of emission of the third peak of light toward one side of the tangential direction, with respect to the luminous intensity distribution in the first cross section (hereinafter simply referred to as the emission direction of the third peak), and arrow G indicates the direction of emission of the fourth peak of light toward the other side of the tangential direction (hereinafter simply referred to as the emission direction of the fourth peak). 【0027】 As shown in Figures 9 and 10, the inner surface 56 on the light incident side of the optical member 55 includes a concave portion 56a that is convex on the light emission side. As shown in Figure 9, in the first cross-section, the outer surface 57 on the light emission side of the optical member 55 is asymmetric with respect to the optical axis. More specifically, in the first cross-section, the central portion 57a ​​of the outer surface 57 protrudes more towards the light emission side than the peripheral portion 57b. Also, the angle θ1 of the emission direction of the first peak with respect to the light emission direction of the optical axis is smaller than the angle θ2 of the emission direction of the second peak with respect to the light emission direction of the optical axis. On the other hand, as shown in Figure 10, in the second cross-section, the outer surface 57 on the light emission side of the optical member 55 is symmetric with respect to the optical axis. Also, the angle θ3 of the emission direction of the third peak with respect to the light emission direction of the optical axis is approximately the same as the angle θ4 of the emission direction of the fourth peak with respect to the light emission direction of the optical axis. 【0028】 Figure 11 is a luminous intensity distribution diagram showing the relationship between the irradiation angle and luminous intensity of light emitted from the optical element 55. Specifically, the solid line is the luminous intensity distribution diagram showing the relationship between the irradiation angle and luminous intensity of light emitted from the optical element 55 in the first cross-section, and the dotted line is the luminous intensity distribution diagram showing the relationship between the irradiation angle and luminous intensity of light emitted from the optical element 55 in the second cross-section. As shown in Figure 11, the luminous intensity (intensity) of the first peak is greater than that of the second peak. Also, the luminous intensities of the third and fourth peaks are greater than that of the second peak and less than that of the first peak. 【0029】 Figure 12 is a cross-sectional view of the lighting fixture 1 showing the direction in which strong light is emitted from one solid-state light-emitting element 30. As shown in Figure 12, the diffuser cover 50 is convex with respect to the direction of light emission. The height distance between the diffuser cover 50 and the peripheral side of the substrate 15 is smaller than the height distance between the diffuser cover 50 and the central side of the substrate 15. Furthermore, with respect to the light directed radially inward from each solid-state light-emitting element 30, strong light L1 is emitted towards the central side of the emission surface 50a of the diffuser cover 50, and with respect to the light directed radially outward from each solid-state light-emitting element 30, strong light L2 is emitted towards the peripheral side of the emission surface 50a of the diffuser cover 50. 【0030】 Next, the effects of the lighting fixture 1 of this embodiment will be described. Figure 13 shows the luminous intensity distribution of the irradiated light directly below in a reference example lighting fixture in which an optical element is used instead of optical element 55, such that the first and second peaks are substantially the same as the third peak, in comparison with optical element 55. The optical element used in the reference example lighting fixture is a lens composed of a rotating body whose axis of rotation is the optical axis of the light emitted from the corresponding solid-state light-emitting element. Figure 14 also shows the luminous intensity distribution of the irradiated light directly below in the lighting fixture 1 of this embodiment. 【0031】 As shown in Figure 13, when using an optical component of a reference example that emits the same light at any circumferential position, the luminous intensity of the light at the center tends to be lower than that of the light at the outer edge, with respect to the emitted light from the lighting fixture in the height direction. In contrast, as shown in Figure 9, in the lighting fixture 1 of this embodiment, with respect to the luminous intensity distribution in a first cross section including the center perpendicular to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30 with respect to the light emitted from the optical component 55, the angle θ1 of the emission direction of the first peak of light directed toward the center with respect to the light emission direction of the optical axis is smaller than the angle θ2 of the emission direction of the second peak of light directed toward the periphery with respect to the light emission direction of the optical axis. 【0032】 Therefore, with respect to the light directed radially inward from each solid-state light-emitting element 30, strong light is more likely to be emitted towards the central part of the emission surface 50a of the diffusion cover 50. As a result, as shown in Figure 14, it is easier to increase the luminous intensity of the light on the central side with respect to the emitted light emitted from the lighting fixture 1 in the height direction. Also, because the angle θ1 is smaller than the angle θ2, with respect to the light directed orthogonally outward from the optical element 55, in this embodiment, towards the radially outward region, strong light is more likely to be emitted towards the outer edge of the emission surface 50a of the diffusion cover 50. Therefore, the light is more likely to spread to the outside of the emission surface 50a of the diffusion cover 50. Thus, the entire emission surface of the diffusion cover 50 is more likely to be illuminated uniformly, resulting in a larger illumination surface and easier irradiation of more uniform and beautiful light. 【0033】 With respect to the light emitted radially inward from each solid-state light-emitting element, in order to make it easier for strong light to be emitted towards the central part of the emission surface of the diffusion cover, the optical element is simply constructed as a rotating body with the optical axis of the light emitted from the corresponding solid-state light-emitting element as its central axis, so that the optical element emits light that is approximately symmetrical in the circumferential direction, and then by reducing θ1, strong light becomes less likely to be emitted towards the outer edge of the emission surface of the cover, and the light does not spread outward easily, so the outer edge of the diffusion cover tends to become darker. 【0034】 As shown in Figure 11, the luminous intensity of the first peak may be greater than that of the second peak. When the luminous intensity of the first peak is greater than that of the second peak, it is often easier to emit more uniform light, and it is often easier to emit beautiful and clear light. In addition, one or more optical members 55 may consist of one or more lenses arranged on the light-emitting side of one or more solid-state light-emitting elements 30. With this configuration, in one or more solid-state light-emitting elements 30, an optical member 55 corresponding to each solid-state light-emitting element 30 is arranged. Therefore, the emission direction and luminous intensity of the light emitted from each solid-state light-emitting element 30 are easily controlled. Thus, it is easier to emit beautiful and clear light from the lighting fixture 1. 【0035】 Furthermore, part or all of one or more optical elements 55 may be included in the resin sheet 35 and integrally connected. This configuration makes it easy to arrange the optical elements 55 on the light-emitting side of one or more solid-state light-emitting elements 30. The multiple solid-state light-emitting elements 30 may include three or more solid-state light-emitting elements 30 arranged in a staggered pattern, in which case the multiple solid-state light-emitting elements 30 can be arranged at a higher density. 【0036】 For all solid-state light-emitting elements, if strong light from the corresponding optical element is emitted towards the central part of the emission surface of the diffusion cover, the light emitted from the illuminator in the height direction may become too strong towards the center. In the illuminator 1 of this embodiment, if the illuminator 1 is equipped with multiple optical elements 55, and all optical elements 55 have approximately the same angle of the emission direction of the first peak with respect to the light emission direction of the optical axis, it is possible to suppress the light from becoming too strong towards the center when emitted from the illuminator in the height direction, making it easier to achieve a moderate brightness for the light in the center. Therefore, it is easier to emit a clean illumination. In addition, the arrangement of the optical elements 55 becomes easier, and mass production efficiency can be improved. 【0037】 The inner surface 56 on the light incident side of the optical element (asymmetric optical element) 55 includes a concave portion 56a that is convex on the light emission side. In a first cross section of the optical element 55 that includes the center (in this embodiment, the radial center) perpendicular to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30, the outer surface 57 on the light emission side may be asymmetric with respect to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30. Furthermore, in a second cross section that includes the optical axis of the light emitted from the corresponding solid-state light-emitting element 30 and is perpendicular to the first cross section, the outer surface 57 may be substantially symmetric with respect to the optical axis. Using the optical element 55 with this configuration makes it easier to emit uniform light, resulting in beautiful and clear light. 【0038】 The optical element 55 may be textured, and at least a portion of at least one of the outer surface on the light-emitting side of the optical element 55 and the inner surface on the light-incoming side of the optical element 55 may have irregularities. This configuration makes it possible to suppress color unevenness and brightness unevenness of the light emitted from the optical element 55. Here, for example, the depth of the recess (height of the protrusion) can be 5 μm or more and 50 μm or less. 【0039】 The light source 80 of this disclosure (see Figure 2) comprises a solid-state light-emitting element 30 and an optical element (asymmetric optical element) 55 disposed on the light-emitting side of the solid-state light-emitting element 30, wherein the inner surface 56 on the light-incident side of the optical element 55 includes a concave portion 56a that is convex toward the light-emitting side. Furthermore, the light source 80 has a first cross section and a second cross section that satisfy the condition that in a first cross section including the optical axis of the light emitted from the solid-state light-emitting element 30, the outer surface 57 on the light-emitting side of the optical element 55 is asymmetric with respect to the optical axis, while in a second cross section that includes the optical axis and is perpendicular to the first cross section, the outer surface 57 is substantially symmetric with respect to the optical axis. If a lighting fixture 1 is manufactured using the light source 80 of this disclosure, it is easy to increase the luminous intensity of the light on the central side with respect to the emitted light emitted in the height direction from the lighting fixture 1, making it easy to emit uniform emitted light, and making it easy to emit beautiful and clear light. 【0040】 This disclosure is not limited to the embodiments and their variations, and various improvements and modifications are possible within the scope of the claims of this application and their equivalents. 【0041】 For example, in the above embodiment, the lighting fixture 1 comprises a plurality of solid-state light-emitting elements 30 and a plurality of optical elements 55, and the number of solid-state light-emitting elements 30 matches the number of optical elements 55. Furthermore, the plurality of optical elements 55 consist of only one type of optical element 55, and the plurality of optical elements 55 do not include two or more different optical elements. In addition, all optical elements 55 are contained within a single translucent resin sheet 35 and molded as one unit. 【0042】 However, in the illuminating fixture of this disclosure, the number of optical components may be less than the number of solid-state light-emitting elements, and the illuminating fixture may include one or more solid-state light-emitting elements whose light-emitting side is not covered by an optical component. 【0043】 Furthermore, in the illuminating fixture of this disclosure, one or more asymmetric optical members include two or more asymmetric optical members in which the angle of the emission direction of the first peak with respect to the light emission side direction of the optical axis is different, as well as the orthogonal distance from the center in the orthogonal direction (for example, the radial distance from the center in the radial direction) is different. With respect to these two or more asymmetric optical members, the angle of the emission direction of the first peak of the light emitted from the central asymmetric optical member with respect to the light emission side direction of the optical axis may be smaller than the angle of the emission direction of the first peak of the light emitted from the peripheral asymmetric optical member with respect to the light emission side direction of the optical axis. With this configuration, it is possible to realize illumination light with high luminosity on the central side with respect to the emitted light emitted from the illuminating fixture in the height direction. Therefore, it is possible to produce bright, beautiful, and stylish light in the center. 【0044】 The illuminating fixture of this disclosure may include one or more (preferably more) asymmetric optical members, wherein the angle of the emission direction of the first peak of light directed toward the central part with respect to the light emission side direction of the optical axis is smaller than the angle of the emission direction of the second peak of light directed toward the peripheral part with respect to the light emission side direction of the optical axis, and may also include one or more (preferably more) symmetric optical members, which are composed of a rotating body with the optical axis of the light emitted from the corresponding solid-state light-emitting element as its central axis, and emit light that is substantially symmetric in the circumferential direction. 【0045】 The multiple solid-state light-emitting elements in the lighting fixture may be covered with multiple resin sheets, and the multiple optical members contained in each resin sheet may cover the light-emitting sides of the multiple solid-state light-emitting elements in a number corresponding to the number of sheets. Alternatively, the light-emitting sides of the multiple solid-state light-emitting elements in the lighting fixture may be covered with a number of optical members corresponding to the number of elements, and the multiple optical members may be separated from each other. Furthermore, the case in which the light-transmitting cover is a diffusion cover 50 and is a cover that diffuses light has been described. However, the light-transmitting cover does not have to have light-diffusing properties. 【0046】 The light-emitting sides of multiple solid-state light-emitting elements in a lighting fixture may be covered with a smaller number of asymmetric optical elements. For example, when N and M are each natural numbers and at least one of N and M is an integer of 2 or more, N × M solid-state light-emitting elements mounted in a matrix on a substrate in an N x M grid may be covered with one large asymmetric optical element, and in that asymmetric optical element, the angle of the emission direction of the first peak of light directed toward the center with respect to the light-emitting side direction of the optical axis may be smaller than the angle of the emission direction of the second peak of light directed toward the periphery with respect to the light-emitting side direction of the optical axis. 【0047】 Alternatively, when L is a natural number greater than or equal to 3, L solid-state light-emitting elements arranged in a staggered pattern on a substrate may be covered by a single large asymmetric optical element, in which the angle of the emission direction of the first peak of light directed toward the center with respect to the light emission side direction of the optical axis may be smaller than the angle of the emission direction of the second peak of light directed toward the periphery with respect to the light emission side direction of the optical axis. 【0048】 Here, whether the multiple solid-state light-emitting elements are arranged in a matrix or in a staggered arrangement, the single large asymmetric optical element can be easily realized by employing the structure described in detail above using Figures 7 and 8. 【0049】 Furthermore, the lighting fixtures of this disclosure may have the following configurations. Configuration 1: A lighting fixture comprising a substrate, a plurality of solid-state light-emitting elements mounted on the substrate so as to surround the central portion in an orthogonal direction perpendicular to the height direction, one or more optical members disposed on the light-emitting side of one or more of the solid-state light-emitting elements included in the plurality of solid-state light-emitting elements, and a translucent cover disposed on the light-emitting side of the plurality of solid-state light-emitting elements, wherein the one or more optical members include one or more asymmetric optical members, and with respect to the luminous intensity distribution in a cross section including the center in an orthogonal direction to the optical axis of the corresponding solid-state light-emitting element, the angle of the emission direction of the first peak of light toward the center with respect to the light-emitting side direction of the optical axis is smaller than the angle of the emission direction of the second peak of light toward the periphery with respect to the light-emitting side direction. Configuration 2: The lighting fixture according to Configuration 1, wherein the cover is convex with respect to the direction of light emission, and the height distance between the cover and the peripheral edge of the substrate is smaller than the height distance between the cover and the central side of the substrate. Configuration 3: The lighting fixture according to Configuration 1 or 2, wherein the luminous intensity of the first peak is greater than the luminous intensity of the second peak. Configuration 4: The lighting fixture according to any one of Configurations 1 to 3, wherein the one or more optical members are composed of one or more lenses arranged on the light-emitting side of each of the one or more solid-state light-emitting elements. Configuration 5: A lighting fixture according to any one of Configurations 1 to 4, wherein some or all of the one or more optical components are integrally connected. Configuration 6: The lighting fixture according to any one of Configurations 1 to 5, wherein the inner surface on the light incident side of the asymmetric optical member includes a concave portion that is convex on the light emission side, the outer surface on the light emission side of the asymmetric optical member is asymmetric with respect to the optical axis in the cross-section, and the outer surface is substantially symmetric with respect to the optical axis in a second cross-section that includes the optical axis and is perpendicular to the cross-section. Configuration 7: The lighting fixture according to any one of Configurations 1 to 6, wherein the plurality of solid-state light-emitting elements include three or more solid-state light-emitting elements arranged in a staggered pattern. Configuration 8: The lighting fixture according to any one of Configurations 1 to 7, wherein the one or more asymmetric optical members include two or more asymmetric optical members that have different angles of emission direction of the first peak with respect to the light emission side direction and different distances in the orthogonal direction from the center, and with respect to the two or more asymmetric optical members, the angle of emission direction of the first peak of the light emitted from the central asymmetric optical member with respect to the light emission side direction is smaller than the angle of emission direction of the first peak of the light emitted from the peripheral asymmetric optical member with respect to the light emission side direction. Configuration 9: A lighting fixture according to any one of Configurations 1 to 7, comprising a plurality of the asymmetric optical members, wherein all of the asymmetric optical members have substantially the same angle of the emission direction of the first peak with respect to the light emission side direction. Configuration 10: A lighting fixture according to any one of Configurations 1 to 9, wherein at least a portion of at least one of the outer surface on the light-emitting side of the optical member and the inner surface on the light-incoming side of the optical member is provided with irregularities. [Explanation of Symbols] 【0050】 1 Lighting fixture, 5 Electronic components, 10 Base members, 15 Substrate, 20 Light-emitting part, 30 Solid-state light-emitting element, 25 Reflective sheet, 35 Resin sheet, 45 Protective cover, 50 Diffuser cover, 50a Emitting surface, 55 Optical component, 56 Inner surface, 56a Concave surface, 57 Outer surface, 80 Light source.

Claims

[Claim 1] circuit board and Multiple solid-state light-emitting elements are mounted on a substrate so as to surround the central part in an orthogonal direction perpendicular to the height direction, One or more optical members are arranged on the light-emitting side of one or more solid-state light-emitting elements, which are included in a plurality of solid-state light-emitting elements. The plurality of solid-state light-emitting elements are provided with a translucent cover positioned on the light-emitting side, The one or more optical members include one or more asymmetric optical members. A lighting fixture in which, with respect to the luminous intensity distribution in a cross-section including the center perpendicular to the optical axis of the light emitted from the corresponding solid-state light-emitting element, the angle of the emission direction of the first peak of light directed toward the center with respect to the light emission side direction of the optical axis is smaller than the angle of the emission direction of the second peak of light directed toward the periphery with respect to the light emission side direction. [Claim 2] The cover is convex with respect to the direction of light emission, The lighting fixture according to claim 1, wherein the height distance between the cover and the peripheral edge of the substrate is smaller than the height distance between the cover and the central side of the substrate. [Claim 3] The lighting fixture according to claim 1, wherein the luminous intensity of the first peak is greater than the luminous intensity of the second peak. [Claim 4] The lighting fixture according to claim 1, wherein the one or more optical members are composed of one or more lenses arranged on the light-emitting side of each of the one or more solid-state light-emitting elements. [Claim 5] The lighting fixture according to claim 1, wherein some or all of the one or more optical members are integrally connected. [Claim 6] The inner surface of the asymmetric optical member on the light incident side includes a concave portion that is convex on the light emission side. In the cross-section, the outer surface on the light-emitting side of the asymmetric optical member is asymmetric with respect to the optical axis. The lighting fixture according to claim 1, wherein in a second cross-section that includes the optical axis and is perpendicular to the cross-section, the outer surface is substantially symmetric with respect to the optical axis. [Claim 7] The lighting fixture according to claim 1, wherein the plurality of solid-state light-emitting elements include three or more solid-state light-emitting elements arranged in a staggered pattern. [Claim 8] The one or more asymmetric optical members include two or more asymmetric optical members in which the angle of the emission direction of the first peak with respect to the light emission side direction is different and the distance from the center in the orthogonal direction is different, The lighting fixture according to claim 1, wherein, with respect to the two or more asymmetric optical members, the angle of the emission direction of the first peak of the light emitted from the central asymmetric optical member with respect to the light emission side is smaller than the angle of the emission direction of the first peak of the light emitted from the peripheral asymmetric optical member with respect to the light emission side. [Claim 9] The system comprises a plurality of the aforementioned asymmetric optical members, The lighting fixture according to claim 1, wherein all of the asymmetric optical members have substantially the same angle between the emission direction of the first peak and the light emission side direction. [Claim 10] The lighting fixture according to any one of claims 1 to 9, wherein at least a portion of at least one of the outer surface on the light-emitting side of the optical member and the inner surface on the light-incoming side of the optical member is provided with irregularities. [Claim 11] Solid-state light-emitting devices, The solid-state light-emitting element comprises an asymmetric optical member disposed on the light-emitting side, The inner surface of the asymmetric optical member on the light incident side includes a concave portion that is convex on the light emission side. A light source having a first cross-section and a second cross-section that satisfy the following conditions: in a first cross-section including the optical axis of light emitted from the solid-state light-emitting element, the outer surface on the light-emitting side of the asymmetric optical member is asymmetric with respect to the optical axis, while in a second cross-section that includes the optical axis and is perpendicular to the first cross-section, the outer surface is substantially symmetric with respect to the optical axis.

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