Lighting fixtures and light sources

Abstract

To provide lighting fixtures and the like that can easily emit beautiful, nearly circular light, despite using a substrate with a roughly rectangular outer edge. [Solution] The lighting fixture 1 comprises a substrate 15 having a substantially rectangular outer edge, a plurality of solid-state light-emitting elements mounted so as to surround the central part of the substrate 15, one or more optical members 55a, 55b arranged on the light-emitting side of one or more of the plurality of solid-state light-emitting elements, and a diffusion cover covering the optical members 55a, 55b. The one or more optical members 55a, 55b include one or more second optical members 55b whose luminous intensity distribution in the width direction of the substrate 15 is wider than the luminous intensity distribution in the longitudinal direction of the substrate 15.

Description

【Technical Field】 【0001】 The present disclosure relates to lighting fixtures and light sources. 【Background Art】 【0002】 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-emitting 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 installing a lighting fixture in a large space, in order to emit bright light from the lighting fixture, it is necessary to increase the area of the substrate mounting surface and increase the number of solid-state light-emitting elements mounted on the substrate. However, due to the structure of the furnace used in the production of the substrate, etc., the dimension of the substrate in one direction may not be lengthened by a predetermined distance or more, and in some cases, only the dimension of the substrate in the other direction can be lengthened. In some cases, there is no choice but to use a substrate whose dimension in the other direction is larger than the dimension in one direction of the substrate and whose outer edge is substantially in the longitudinal direction. 【0005】 In such a case, since the number of elements in a row of solid-state light-emitting elements arranged along the longitudinal direction of the substrate is larger than the number of elements in a row of solid-state light-emitting elements arranged along the width direction of the substrate, the emitted light emitted from the lighting fixture is likely to have a shape approximating a rectangle, and it becomes difficult to emit beautiful emitted light close to a circular shape. 【0006】 ​Therefore, the object of this disclosure is to provide a lighting fixture that can easily emit beautiful, nearly circular light, despite using a substrate with a substantially rectangular outer edge. Another object of this disclosure is to provide a light source that can easily emit beautiful, nearly circular light, in a lighting fixture having a substrate with a substantially rectangular outer edge. [Means for solving the problem] 【0007】 To solve the above problems, the lighting fixture according to the present disclosure comprises a substrate having a substantially rectangular outer edge, a plurality of solid-state light-emitting elements mounted so as to surround the central part of the substrate, one or more optical members arranged on the light-emitting side of one or more of the plurality of solid-state light-emitting elements, and a light-transmitting cover that covers the optical members and has light-diffusing properties, wherein the one or more optical members include a portion of the luminous intensity distribution bias in which the luminous intensity distribution in the width direction of the substrate is wider than the luminous intensity distribution in the longitudinal direction of the substrate. 【0008】 Furthermore, the light source according to this disclosure comprises a solid-state light-emitting element and a light intensity distribution biasing lens disposed on the light-emitting side of the solid-state light-emitting element, wherein the light intensity distribution biasing lens includes a concave portion on the inner surface on the light-incident side that is convex toward the light-emitting side, the curvature in the width direction of the concave portion is smaller than the curvature in the longitudinal direction of the concave portion, the shape of the light-incident side of the light intensity distribution biasing lens when viewed from the thickness direction of the substrate is a closed curve in which the shortest diameter and the longest diameter, which is longer than the shortest diameter, alternate at approximately 90-degree intervals in the circumferential direction, and the shape of the light-emitting side of the light intensity distribution biasing lens when viewed from the thickness direction of the substrate is approximately circular. [Effects of the Invention] 【0009】 According to the illuminating fixture described herein, even when using a substrate with a roughly rectangular outer edge, it is easy to emit beautiful, nearly circular light. Furthermore, according to the light source described herein, it is easy to emit beautiful, nearly circular light in a illuminating fixture having a substrate with a roughly rectangular outer edge. [Brief explanation of the drawing] 【0010】 [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 luminous intensity distribution diagram showing the relationship between the irradiation angle and luminous intensity in the first optical element. [Figure 10] This is a cross-sectional view of the second optical component when it is cut by a plane that includes the optical axis of the light emitted from the corresponding solid-state light-emitting element and the width direction of the substrate. [Figure 11] This is a cross-sectional view of the second optical component when it is cut by a plane that includes the optical axis of the light emitted from the corresponding solid-state light-emitting element and the longitudinal direction of the substrate. [Figure 12] This is a luminous intensity distribution diagram showing the relationship between the irradiation angle and luminous intensity in the second optical element. [Figure 13] This diagram illustrates the shape of the emitted light emitted downward from the second optical element. [Figure 14] This figure shows the illuminance distribution of light emitted to the lower side of a reference example lighting fixture, which differs from the lighting fixture of the above embodiment only in that each second optical member is replaced with a first optical member. [Figure 15]It is a diagram showing the illuminance distribution of the downward-emitted light in the above lighting fixture. 【Embodiments for Carrying Out the Invention】 【0011】 Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In the following, when a plurality of embodiments, modification examples, etc. are included, it is assumed from the beginning that new embodiments can be constructed by appropriately combining their characteristic parts. In the following examples, the same reference numerals are given to the same configurations in the drawings, and duplicate explanations are omitted. Also, the plurality of drawings include schematic diagrams, and the dimensional ratios of each member in the vertical, horizontal, height, etc. directions between different drawings do not necessarily match. A number of components described below include a plurality of components that are arbitrary components and not essential components. Also, in this specification, the term "substantially" may be used with the intention of allowing manufacturing errors (manufacturing variations), and may also be used when expressing the general shape of a member. 【0012】 In the following description, when terms related to the vertical direction such as below, above, lower side, and upper side are used, they indicate the directions in the state where the lighting fixture 1 is installed on the ceiling. Also, when the height direction is mentioned in the following description, the height direction indicates the height direction of the lighting fixture 1, and when the orthogonal direction is mentioned, the orthogonal direction indicates the direction orthogonal to the height direction. In this embodiment, the lighting fixture 1 is installed on the ceiling in a state where the height direction substantially coincides with the vertical direction. 【0013】 The lighting fixture 1 of the embodiment has a shape in which the center and the radial direction can be specified in a plan view when viewed from the height direction. More specifically, the diffusion cover 50 of the embodiment has a dome shape and has a substantially circular shape in a plan view when viewed from the lower side in the height direction. In the following description, when the radial direction is mentioned, the radial direction indicates the radial direction of the diffusion cover 50, when the inner side is mentioned, the inner side indicates the inner side in the radial direction, and when the outer side is mentioned, the outer side indicates the outer side in the radial direction. 【0014】 FIG. 1 is a perspective view of a lighting fixture 1 according to an embodiment of the present disclosure as viewed from obliquely below. The lighting fixture 1 is a ceiling light and is attached to the ceiling of a building. Although not described in detail as it is a well-known structure, the lighting fixture 1 includes an adapter (not shown) 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 to cover the light emitting portion 20 and constitutes a light transmissive cover. 【0015】 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 a plan view when viewed from the lower side in the height direction. The diffusion cover 50 is made of a resin material having light transmissivity, 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. 【0016】 FIG. 2 is a perspective view of the lighting fixture 1 with the diffusion cover 50 removed as 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. 【0017】 With the circumferential position of the protruding portion differing 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 multiple receiving members 40. Then, when the diffusion cover 50 is rotated relative to the base member 10 to one side in the circumferential direction, the diffusion cover 50 elastically deforms radially outward, causing the tapered tip of the protruding portion to overcome the locking portion, and the protruding portion to fit into the recess 41. This fitting locks the protruding portion into the locking portion, and the diffusion cover 50 is fixed to the multiple receiving members 40. 【0018】 Figure 3 is a perspective view of the lighting fixture 1 from a diagonal downward angle, with the protective cover 45 that further protects the electronic components 5 removed from the state shown in Figure 2. As shown in Figure 3, the lighting fixture 1 has a substrate 15 attached to the lower surface 10a of the base member 10 by fixing means, such as screws or adhesive, at the radially inward central part (the circular central part in the example shown in Figure 4). Multiple electronic components 5 constituting the control device and power supply are mounted in the area surrounding the central part of the lower surface (mounting surface) 15a of the substrate 15. The power supply converts AC power from an external source into DC power and steps it down to an appropriate voltage. The control device controls the lighting fixture 1 to turn on and off. 【0019】 The control device, for example, when it receives a wireless signal from a remote control (not shown) indicating that the light is turned on, turns on the switching unit for controlling the light source mounted on the power supply unit. Conversely, when it receives a wireless signal from the remote control indicating that the light is turned off, it turns off the switching unit for controlling the light source. When the light is turned on, power is supplied to the light source and light is emitted from the solid-state light-emitting element (see Figure 4) 30. When the light is turned off, power to the light source is cut off and light is no longer emitted from the solid-state light-emitting element 30. The switching unit is composed of, for example, a transistor. 【0020】 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. 【0021】 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 roughly rectangular outer edge 15b and a cylindrical hole 15c in the center. Here, a roughly rectangular shape is a shape whose general shape is rectangular, and a roughly rectangular shape includes shapes in which the corners are notched by chamfering, etc., 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. 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. 【0022】 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. 【0023】 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 has a roughly rectangular shape that is substantially similar to the substrate 15 when viewed from the height direction, and 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. 【0024】 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. 【0025】 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. 【0026】 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. In this embodiment, all optical members 55 are included in the resin sheet 35 and are integrally connected. 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. 【0027】 As shown in Figure 6, in this embodiment, the resin sheet 35 has a plurality of first optical members 55a and a plurality of second optical members 55b, the first optical members 55a being different from the second optical members 55b. The plurality of first optical members 55a are arranged in the center of the longitudinal direction of the substrate 15, and the plurality of second optical members 55b are arranged at both ends of the longitudinal direction of the substrate 15. The lens constituting the first optical member 55a is a well-known lens and is composed of a rotating body whose axis of rotation is the optical axis of the light emitted from the solid-state light-emitting element 30. Figure 9 is a luminous intensity distribution diagram showing the relationship between the irradiation angle and luminous intensity on a plane containing the optical axis of the first optical member 55a. As shown in Figure 9, axisymmetric emitted light is emitted from the first optical member 55a, in which the irradiation angle and luminous intensity do not fluctuate in the circumferential direction. 【0028】 On the other hand, the second optical member 55b is composed of a lens such that the luminous intensity distribution in the width direction of the substrate 15 is wider than the luminous intensity distribution in the longitudinal direction of the substrate 15. Figure 10 is a cross-sectional view of the second optical member 55b when cut by a cross-section that includes the optical axis of the light emitted from the corresponding solid-state light-emitting element 30 and the width direction of the substrate 15, and Figure 11 is a cross-sectional view of the second optical member 55b when cut by a cross-section that includes the optical axis of the light emitted from the corresponding solid-state light-emitting element 30 and the longitudinal direction of the substrate 15. 【0029】 The second optical element 55b is composed of a light intensity distribution biasing lens, which includes a concave portion 71 on the inner surface on the light incident side that is convex on the light emission side. The direction indicated by arrow A in Figure 10 is the direction in which the light with the highest luminous intensity is emitted from the second optical element 55b in the width direction of the substrate 15, and the direction indicated by arrow B in Figure 11 is the direction in which the light with the highest luminous intensity is emitted from the second optical element 55b in the longitudinal direction of the substrate 15. 【0030】 Figure 12 is a luminous intensity distribution diagram showing the relationship between the irradiation angle and luminous intensity in the second optical element. More specifically, in Figure 12, the luminous intensity distribution shown by the solid line represents the emission angle and emission luminous intensity of the emitted light emitted from the second optical element 55b in the width direction of the substrate 15, and the luminous intensity distribution shown by the dotted line represents the emission angle and emission luminous intensity of the emitted light emitted from the second optical element 55b in the longitudinal direction of the substrate 15. 【0031】 As shown in Figure 12, the second optical member 55b has a wider luminous intensity distribution (light irradiation angle distribution) in the width direction of the substrate 15 than the luminous intensity distribution (light irradiation angle distribution) in the longitudinal direction of the substrate 15. Furthermore, as shown in Figures 10 and 11, in the lighting fixture 1, in comparison with the longitudinal direction of the substrate 15, strong light is emitted from the second optical member 55b in the width direction of the substrate 15 in the direction of a small tilt angle with respect to the radial direction, and light is emitted from the second optical member 55b over a wide area in the width direction of the substrate 15. 【0032】 As shown in Figures 10 and 11, the second optical member 55b includes a concave portion 71 on the inner surface on the light incidence side that is convex on the light emission side. The curvature of the concave portion 71 in the width direction is smaller than the curvature of the concave portion 71 in the longitudinal direction. When the light incidence side of the second optical member 55b is viewed from the thickness direction of the substrate 15, the shape is a closed curve in which the shortest diameter (minor axis) and the longest diameter (major axis), which is longer than the minor axis, alternate at approximately 90-degree intervals in the circumferential direction. 【0033】 The light-incident side of the second optical element 55b, when viewed from the thickness direction of the substrate 15, has a roughly elliptical shape, while the light-emitting side of the second optical element 55b, when viewed from the thickness direction of the substrate 15, has a roughly circular shape. Because the light-incident side of the second optical element 55b has a roughly elliptical shape, as shown in Figure 13, the emission range in the width direction of the substrate 15 is wider than the emission range in the longitudinal direction of the substrate 15, resulting in roughly elliptical light being emitted from the second optical element 55b. Furthermore, because the light-emitting side of the second optical element 55b has a roughly circular shape, the second optical element 55b can be arranged at high density on the substrate 15. 【0034】 Next, the effects of the lighting fixture 1 of this embodiment will be described. Figure 14 is a diagram showing the illuminance distribution of light emitted downwards from a reference example lighting fixture, which differs from lighting fixture 1 only in that each second optical member 55b is replaced with a first optical member 55a, and Figure 15 is a diagram showing the illuminance distribution of light emitted downwards from lighting fixture 1. 【0035】 When installing lighting fixtures in a large space, it is necessary to increase the surface area of ​​the substrate mounting surface and the number of solid-state light-emitting elements mounted on the substrate in order to emit bright light from the lighting fixture. However, due to the structure of the furnace used in substrate manufacturing, it may not be possible to increase the dimension of the substrate in one direction by more than a certain distance, and it may be necessary to increase only the dimension of the substrate in the other direction, resulting in a substrate where the dimension in the other direction is larger than the dimension in one direction, and the outer edge is approximately in the longitudinal direction. 【0036】 In this case, the number of rows of solid-state light-emitting elements arranged along the longitudinal direction of the substrate is greater than the number of rows of solid-state light-emitting elements arranged along the width direction of the substrate. Therefore, if the light emitted from each solid-state light-emitting element 30 mounted on a substrate 15 having a roughly rectangular plan view is circumferentially symmetric with respect to the optical axis of the light emitted from the solid-state light-emitting element 30, the emitted light from the lighting fixture tends to approximate a rectangle corresponding to the planar shape of the substrate 15, as shown in Figure 12. 【0037】 In contrast, the lighting fixture 1 of the present disclosure comprises a substrate 15 having a substantially rectangular outer edge, a plurality of solid-state light-emitting elements 30 mounted so as to surround the central part of the substrate 15, one or more optical members 55a, 55b arranged on the light-emitting side of one or more of the plurality of solid-state light-emitting elements 30, and a diffusion cover (translucent cover) 50 covering the optical members 55a, 55b, wherein the one or more optical members 55a, 55b include one or more second optical members 55b (luminous intensity distribution biased portion) in which the luminous intensity distribution in the width direction of the substrate 15 is wider than the luminous intensity distribution in the longitudinal direction of the substrate 15. 【0038】 Therefore, the emission range of the emitted light in the width direction of the substrate 15 is widened by the light emitted from one or more second optical members 55b, so that the emission range of the emitted light in the longitudinal direction of the substrate 15 and the emission range of the emitted light in the width direction of the substrate 15 can be brought closer together. Thus, as shown in Figure 15, it is easy to emit a beautiful, nearly circular beam of light from the lighting fixture 1. 【0039】 One or more optical elements 55a, 55b may be composed of one or more lenses arranged on the light-emitting side of one or more solid-state light-emitting elements 30. In this configuration, one or more solid-state light-emitting elements 30 have optical elements 55a, 55b corresponding to each solid-state light-emitting element 30. Therefore, the emission direction and luminous intensity of the emitted light from one or more solid-state light-emitting elements 30 can be easily controlled. Thus, it is easier to emit beautiful, nearly circular emitted light from the lighting fixture 1. 【0040】 One or more optical members 55a, 55b may be partially or entirely included in the resin sheet 35 and integrally connected. This configuration makes it easy to arrange the optical members 55a, 55b on the light-emitting side of one or more solid-state light-emitting elements 30. 【0041】 One or more optical members 55a, 55b may include one or more second optical members (luminosity distribution biasing lenses) 55b, each having a concave portion 71 on its inner surface on the light incident side that is convex towards the light output side. Furthermore, the curvature of the concave portion 71 in the width direction may be smaller than the curvature of the concave portion 71 in the longitudinal direction. With this configuration, it is easy to bring the output region of the substrate 15 in the width direction and the output region of the substrate 15 in the longitudinal direction closer together with a simple configuration. 【0042】 The shape of the light incident side of the second optical member 55b when viewed from the thickness direction of the substrate 15 may be a closed curve in which the shortest diameter and the longest diameter, which is longer than the shortest diameter, alternate at approximately 90-degree intervals in the circumferential direction, and the shape of the light emission side of the second optical member 55b when viewed from the thickness direction of the substrate 15 may be approximately circular. 【0043】 This configuration makes it easy to emit light in a substantially elliptical shape from the second optical element 55b, and at the same time, it is easy to arrange the second optical elements 55b at a high density. Therefore, it is easy to emit circular light with high circularity from the lighting fixture 1, and it is easy to emit beautiful and clear light. In addition, 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. 【0044】 The optical members 55a and 55b may be textured, and at least a portion of at least one of the outer surfaces on the light-emitting side of the optical members 55a and 55b and the inner surfaces on the light-incoming side of the optical members 55a and 55b may have irregularities. This configuration makes it possible to suppress brightness unevenness of the light emitted from the optical members 55a and 55b. Here, for example, the depth of the recess (height of the protrusion) can be 5 μm or more and 50 μm or less. 【0045】 The light source 80 of this disclosure (see Figure 2) comprises a solid-state light-emitting element 30 and a second optical element 55b (luminescence distribution biasing lens) positioned on the light-emitting side of the solid-state light-emitting element 30. The second optical element 55b includes a concave portion 71 on its inner surface on the light-incident side that is convex towards the light-emitting side, and the curvature of the concave portion 71 in the longitudinal direction is greater than the curvature of the concave portion 71 in the width direction. Furthermore, the shape of the solid-state light-emitting element 30 when viewed from the thickness direction of the substrate 15 on the light-incident side is a closed curve in which the shortest diameter and the longest diameter, which is longer than the shortest diameter, alternate at approximately 90-degree intervals in the circumferential direction. Furthermore, the shape of the second optical element 55b when viewed from the thickness direction of the substrate 15 on the light-emitting side is approximately circular. 【0046】 According to the light source 80 of this disclosure, the light emission range in a first direction on a plane perpendicular to its optical axis is wider than the light emission range in a second direction perpendicular to the first direction on the same plane. Therefore, even when multiple light sources 80 are arranged on a substrate 15 with a substantially rectangular outer edge in a plan view from the thickness direction such that the arrangement range in the longitudinal direction of the substrate 15 is wider than the arrangement range in the width direction of the substrate 15, it is possible to emit bright light and produce a beautiful, nearly circular emitted light. 【0047】 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. 【0048】 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 55a, 55b, where the number of solid-state light-emitting elements 30 matches the number of optical elements 55a, 55b. Furthermore, the plurality of optical elements 55a, 55b are composed of a plurality of first optical elements 55a and a plurality of second optical elements 55b, with light circumferentially symmetric with respect to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30 being emitted from the first optical elements 55a, while light circumferentially asymmetric with respect to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30 being emitted from the second optical elements 55b. In addition, the plurality of first optical elements 55a are arranged in the center of the longitudinal direction of the substrate 15, and the plurality of second optical elements 55b are arranged at both ends of the longitudinal direction of the substrate 15. All of the optical elements 55a, 55b are included in a single translucent resin sheet 35 and molded together. 【0049】 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. 【0050】 Furthermore, in the lighting fixture of this disclosure, a plurality of first optical members 55a that emit light symmetrical in the circumferential direction with respect to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30 may be arranged at both ends in the longitudinal direction of the substrate 15, while a plurality of second optical members 55b that emit light asymmetrical in the circumferential direction with respect to the optical axis of the corresponding solid-state light-emitting element 30 may be arranged in the central part in the longitudinal direction of the substrate 15. 【0051】 Alternatively, the luminaire of this disclosure may not have a first optical member 55a that emits light symmetrical in the circumferential direction with respect to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30, but may have a plurality of second optical members 55b that emit light asymmetrical in the circumferential direction with respect to the optical axis of the light emitted from the corresponding solid-state light-emitting element 30. The plurality of second optical members 55b may be arranged not only at both ends in the longitudinal direction of the substrate 15, but also in the center in the longitudinal direction of the substrate 15. 【0052】 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 corresponding number of solid-state light-emitting elements. Alternatively, the light-emitting sides of the multiple solid-state light-emitting elements in the lighting fixture may be covered with a corresponding number of optical members, and these 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. 【0053】 The light-emitting sides of multiple solid-state light-emitting elements in a lighting fixture may be covered with a smaller number of 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 on a substrate in a matrix of N rows and M columns may be covered with one large optical element. In this case, the optical element may have a structure such that the longitudinal range of the emitted light emitted from the optical element in the longitudinal direction of the substrate is smaller than the widthwise range of the emitted light emitted from the optical element in the width direction of the substrate. 【0054】 Alternatively, when L is a natural number of 3 or more, L solid-state light-emitting elements arranged in a staggered pattern on a substrate may be covered by a single large optical element. In this case, the optical element may have a structure such that the longitudinal range of the emitted light emitted from the optical element in the longitudinal direction of the substrate is smaller than the widthwise range of the emitted light emitted from the optical element in the widthwise direction of the substrate. 【0055】 Here, whether the multiple solid-state optical elements are arranged in a matrix or in a staggered arrangement, the emission of such light can be easily achieved with respect to the single large optical component by employing the structure described in detail above using Figures 10 and 11, etc. 【0056】 Furthermore, the lighting fixtures of this disclosure may have the following configurations. Configuration 1: A lighting fixture comprising a substrate having a substantially rectangular outer edge, a plurality of solid-state light-emitting elements mounted so as to surround the central part of the substrate, one or more optical members positioned on the light-emitting side of one or more of the plurality of solid-state light-emitting elements, and a translucent cover covering the optical members, wherein the one or more optical members include a portion with a biased luminous intensity distribution where the luminous intensity distribution in the width direction of the substrate is wider than the luminous intensity distribution in the longitudinal direction of the substrate. Configuration 2: The lighting fixture according to Configuration 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. Configuration 3: A lighting fixture according to Configuration 1 or 2, wherein some or all of the one or more optical components are integrally connected. Configuration 4: The lighting fixture according to Configuration 2, wherein the one or more lenses include one or more luminous intensity distribution biasing lenses, each having a concave portion on the inner surface on the light incident side that is convex towards the light exit side, and the curvature in the width direction of the concave portion is smaller than the curvature in the longitudinal direction of the concave portion. Configuration 5: The lighting fixture according to Configuration 4, wherein the shape of the light incident side of the light intensity distribution biasing lens, when viewed from the thickness direction of the substrate, is a closed curve in which the shortest diameter and the longest diameter, which is longer than the shortest diameter, alternate at approximately 90-degree intervals in the circumferential direction, and the shape of the light emission side of the light intensity distribution biasing lens, when viewed from the thickness direction of the substrate, is approximately circular. Configuration 6: A lighting fixture according to any one of Configurations 1 to 5, wherein the plurality of solid-state light-emitting elements include three or more solid-state light-emitting elements arranged in a staggered pattern. Configuration 7: A lighting fixture according to any one of Configurations 1 to 6, 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] 【0057】 1 Lighting fixture, 5 Electronic components, 10 Base member, 15 Substrate, 15b Roughly rectangular outer edge of the substrate, 20 Light-emitting part, 25 Reflective sheet, 30 Solid-state light-emitting element, 35 Resin sheet, 50 Diffuser cover, 55 Optical component, 55a First optical component, 55b Second optical component, 71 Concave portion, 80 Light source.

Claims

[Claim 1] A substrate having a roughly rectangular outer edge, Multiple solid-state light-emitting elements are mounted so as to surround the central part of the aforementioned substrate, One or more optical members arranged on the light-emitting side of one or more of the solid-state light-emitting elements among the plurality of solid-state light-emitting elements, The optical element comprises a light-transmitting cover, A lighting fixture in which the one or more optical members include a portion of the substrate where the luminous intensity distribution in the width direction is wider than the luminous intensity distribution in the longitudinal direction of the substrate. [Claim 2] 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 3] The lighting fixture according to claim 1, wherein some or all of the one or more optical members are integrally connected. [Claim 4] The one or more lenses include one or more luminous intensity distribution biasing lenses, which have a concave portion on the inner surface on the light incident side that is convex on the light exit side. The lighting fixture according to claim 2, wherein the curvature in the width direction of the concave portion is smaller than the curvature in the longitudinal direction of the concave portion. [Claim 5] The shape of the light incident side of the light intensity distribution biasing lens, when viewed from the thickness direction of the substrate, is a closed curve in which the shortest diameter and the longest diameter, which is longer than the shortest diameter, alternate at approximately 90-degree intervals in the circumferential direction. The lighting fixture according to claim 4, wherein the shape of the light-emitting side of the light intensity distribution biasing lens, when viewed from the thickness direction of the substrate, is substantially circular. [Claim 6] The lighting fixture according to claim 1, comprising three or more solid-state light-emitting elements arranged in a staggered pattern. [Claim 7] The lighting fixture according to any one of claims 1 to 6, 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 8] Solid-state light-emitting devices, The solid-state light-emitting element comprises a light intensity distribution biasing lens positioned on the light-emitting side, The light intensity distribution biasing lens includes a concave portion on the inner surface on the light incident side that is convex on the light exit side, The curvature of the concave portion in the width direction is smaller than the curvature of the concave portion in the longitudinal direction. The shape of the light incident side of the light intensity distribution biasing lens, when viewed from the thickness direction of the substrate, is a closed curve in which the shortest diameter and the longest diameter, which is longer than the shortest diameter, alternate at approximately 90-degree intervals in the circumferential direction. A light source in which the shape of the light-emitting side of the light intensity distribution biasing lens, when viewed from the thickness direction of the substrate, is approximately circular.

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