Lighting apparatus

Abstract

To provide a luminaire capable of more efficiently illuminating an object range with uniform brightness.SOLUTION: A lighting fixture 10 includes a light source module 30 having a substrate 32 and a plurality of light sources 31 mounted on the substrate 32, and a light distribution control member 20 for controlling light distribution of illumination light emitted from the plurality of light sources 31. The light distribution control member 20 includes a light emission surface 22, and a plurality of incidence portions 21 provided to face each of the plurality of light sources 31 on a side opposite to the light emission surface 22. At least one of the plurality of incidence portions 21 includes a bottom portion 211 facing one light source 31 of the plurality of light sources 31, and a side wall 212 protruding from an edge of the bottom portion 211 toward the light source module 30. The side wall 212 has an incident surface 2121 on which the illumination light is incident, and a total reflection surface 2122 that totally internally reflects the light incident from the incident surface 2121. The total reflection surface 2122 is a curved surface that is convex toward the light exit surface 22.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to lighting fixtures. [Background technology]

[0002] Patent Document 1 discloses a lighting fixture equipped with a light distribution control member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-107558 Summary of the Invention [Problem to be solved by the invention]

[0004] In the lighting fixture disclosed in Patent Document 1, the illuminating light may be locally concentrated by the light distribution control member, resulting in uneven light. Also, in lighting fixtures that irradiate light so as to diffuse it over a wide area, some light is wasted because it deviates from the intended illuminated area.

[0005] The present disclosure aims to provide a lighting fixture that can illuminate a target area more efficiently and with uniform brightness. [Means for solving the problem]

[0006] One aspect of the lighting device according to the present disclosure comprises a substrate, a light source module having a plurality of light sources mounted on the substrate, and a light distribution control member that controls the distribution of illumination light emitted from the plurality of light sources, wherein the light distribution control member has a light exit surface and a plurality of incident sections arranged opposite the light exit surface to face each of the plurality of light sources, at least one of the plurality of incident sections having a bottom facing one of the plurality of light sources and a sidewall protruding from an edge of the bottom toward the light source module, wherein the sidewall has an incident surface onto which the illumination light is incident and a total reflection surface that internally totally reflects the light incident from the incident surface, and the total reflection surface is a curved surface that is convex toward the light exit surface. [Effects of the Invention]

[0007] A lighting fixture according to the present disclosure can illuminate a target area more efficiently and with uniform brightness. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a lighting fixture according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of a main part of the lighting fixture according to the embodiment. [Figure 3] FIG. 3 is a cross-sectional view including the optical axis of a light source included in the lighting fixture according to the embodiment. [Figure 4] FIG. 4 is a diagram showing the path of light passing through the bottom of the incident part of the light distribution control member according to the embodiment. [Figure 5] FIG. 5 is a diagram showing the path of light passing through the incident surface of the incident part of the light distribution control member according to the embodiment. [Figure 6] FIG. 6 is a graph showing the light distribution curve of a lighting fixture. [Figure 7] FIG. 7 is a diagram illustrating the illuminance of the illuminated surface when the lighting fixture according to the embodiment is used. [Figure 8A] FIG. 8A is a diagram illustrating the illuminance of the illuminated surface when another lighting fixture is used. [Figure 8B]FIG. 8B is a diagram illustrating the illuminance of the illuminated surface when still another lighting fixture is used. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement positions, connection forms, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0010] Note that each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales and the like do not necessarily match in each figure. Furthermore, each figure is a schematic diagram in which emphasis, omission, and proportion adjustments have been made as appropriate to illustrate the present disclosure, and may differ from the actual shape, positional relationship, and proportion. Furthermore, in each figure, substantially identical components are assigned the same reference numerals, and duplicate explanations may be omitted or simplified.

[0011] In the following embodiments, the Z-axis direction is the direction in which a lighting device according to the present disclosure emits light. The Z-axis direction may be referred to as the front-to-rear direction, for example, and the positive side of the Z-axis may be referred to as the front, and the negative side of the Z-axis may be referred to as the rear. The X-axis direction and the Y-axis direction are directions that are perpendicular to each other on a plane (horizontal plane) perpendicular to the Z-axis. In a situation in which a lighting device according to the present disclosure emits light horizontally, the XZ plane is the horizontal plane, and the Y-axis direction is the vertical direction. The X-axis direction may be referred to as the left-to-right direction, for example, and the Y-axis direction may be referred to as the up-down direction, for example.

[0012] Furthermore, in this specification, terms indicating relationships between elements such as the same, as well as numerical values ​​and numerical ranges, are not expressions that express only the strict meaning, but also expressions that mean that a substantially equivalent range is included, for example, a difference of about several percent (e.g., 5%). For example, "horizontal direction" does not only mean a perfectly horizontal direction, but also means that an error of about several percent that occurs during manufacturing or placement is included.

[0013] (Embodiment) [composition] First, the configuration of a lighting fixture according to an embodiment will be described. Fig. 1 is a perspective view of a lighting fixture 10 according to an embodiment. Fig. 2 is an exploded perspective view of a main part of the lighting fixture 10 according to the embodiment.

[0014] The lighting fixture 10 is a floodlight used to illuminate (floodlight) a swimming pool, for example. The lighting fixture 10 can also be used to illuminate soccer stadiums, various sports grounds, school playgrounds, etc.

[0015] Lighting fixture 10 includes light distribution control member 20, light source module 30, and fixing member 40 for fixing light distribution control member 20 and light source module 30. Although lighting fixture 10 shown in Fig. 1 includes one light distribution control member 20, the number of light distribution control members 20 included in lighting fixture 10 is not limited to one and may be two or more.

[0016] The fixing member 40 has a housing 41 , an angle determining member 42 , a support member 43 and a frame body 44 .

[0017] The housing 41 is a member to which the light distribution control member 20 and the light source module 30 are fixed. Furthermore, the housing 41 houses a power supply circuit for supplying current to the light source module 30. The housing 41 is formed into a substantially rectangular parallelepiped shape and made of a metal material such as an aluminum steel plate. The housing 41 is coupled to a support member 43 and a frame 44, and the light source module 30 is attached to the housing 41. The housing 41 is provided with, for example, screw holes into which screws for fixing the support member 43, the frame 44, and the light source module 30 are inserted. The power supply circuit may be housed outside the housing 41 in a separate housing.

[0018] Angle setting member 42 is a scale plate attached to housing 41. The scale on angle setting member 42 indicates the angle between housing 41 and support member 43. By determining the angle at which housing 41 and support member 43 are fixed while looking at the scale on angle setting member 42, the installer can adjust the direction of illumination of lighting fixture 10 up or down.

[0019] Support member 43 is made of a metal plate such as a stainless steel plate and is formed into a U-shape in a plan view in the front-to-back direction. Support member 43 is a member for installing lighting fixture 10 at the installation location. Support member 43 has a scale plate at approximately the center, and an installer can adjust the left-right direction of illumination of lighting fixture 10 by determining the angle at which support member 43 should be installed at the installation location while looking at the scale plate.

[0020] Frame body 44 is formed into a rectangular frame shape when viewed from the front-to-rear direction. Frame body 44 is formed from a metal material such as aluminum die-cast. Light source module 30 and light distribution control member 20 are positioned and fixed by being sandwiched between housing 41 and frame body 44. Housing 41 and frame body 44 are fixed by screws, for example.

[0021] FIG. 2 shows light distribution control member 20 and two light source modules 30 that lighting fixture 10 has, as well as members for positioning light distribution control member 20 and light source modules 30.

[0022] Light distribution control member 20 is a member that controls the light distribution of illumination light emitted from multiple light sources 31. Specifically, light distribution control member 20 is a panel lens that includes incident portions 21, the number of which is equal to the total number of light sources 31, and flat plate portion 23 (see FIG. 3 ), which is a single plane. Light distribution control member 20 is formed from a translucent synthetic resin material, for example, polycarbonate resin. Note that light distribution control member 20 may also be formed from a translucent material such as acrylic resin or glass. Because light distribution control member 20 is a panel lens in which incident portions 21 and flat plate portion 23 are integrated, the number of parts of lighting device 10 can be reduced.

[0023] Each of the plurality of incident portions 21 is a convex portion (described in detail later) having a substantially truncated cone shape, and protrudes rearward from the rear surface of the flat plate portion 23. Each of the plurality of incident portions 21 is disposed at a position corresponding to each of the plurality of light sources 31 on a one-to-one basis.

[0024] The light source module 30 includes a substrate 32 and a plurality of light sources 31 mounted on the substrate 32. The light sources 31 are, for example, packaged white LEDs (Light Emitting Diodes). The substrate 32 is, for example, a metal-based substrate based on an aluminum plate. Since the substrate 32 is a metal-based substrate, heat generated by the plurality of light sources 31 can be efficiently dissipated. The plurality of light sources 31 are mounted on the surface of the substrate 32 and arranged at approximately equal intervals. The substrate 32 may be made of a non-metallic material such as glass epoxy.

[0025] A screw hole into which screw 51 is inserted is provided in the center of light distribution control member 20. A plurality of screw holes (six in the illustrated example) into which a plurality of mounting screws 52 are inserted is provided in substrate 32. Screws 51 and mounting screws 52 suppress misalignment between light distribution control member 20 and light source module 30, making it possible to obtain the desired light distribution performance.

[0026] The sealing member 53 is formed in a rectangular frame shape when viewed from the front-to-rear direction. The sealing member 53 is made of an elastic material, such as silicone rubber. The sealing member 53 improves the waterproofing of the lighting fixture 10 and can prevent damage to the power supply circuit and light source module 30.

[0027] 2, light source module 30 is fixed to housing 41 with a plurality of mounting screws 52. Light distribution control member 20 is fixed with screws 51 with seal member 53 sandwiched therebetween. Furthermore, light distribution control member 20 and light source module 30 are fixed so as to be sandwiched between housing 41 and frame body 44.

[0028] [Structure of light distribution control component] The shape of light distribution control member 20 will now be described in detail. Fig. 3 is a cross-sectional view including the optical axis of a portion of a main part of lighting device 10 according to an embodiment. Fig. 3 shows a cross-section including the optical axis of one of multiple incident portions 21 included in light distribution control member 20 and one of multiple light sources 31 included in light source module 30. The optical axis is indicated by a dashed line in Fig. 3. Furthermore, Fig. 3 shows the curved surfaces of incident surface 2121 and total reflection surface 2122 in an exaggerated manner.

[0029] As shown in FIG. 3, at least one of the plurality of incident portions 21 that light distribution control member 20 has has bottom portion 211 and sidewall 212.

[0030] The bottom 211 is formed to face the light source 31. The bottom 211 is a curved surface that is axially symmetric with respect to the optical axis of the light source 31, and more specifically, the bottom 211 is a curved surface that is convex toward the light source 31. Furthermore, the curved surface of the bottom 211 is a part of a sphere, but may also be a part of the surface of an ellipsoid. Illumination light emitted from the light source 31 is incident on the bottom 211. The illumination light that has entered the bottom 211 is refracted by the bottom 211 and is emitted from the light emission surface 22.

[0031] The side wall 212 protrudes from the edge of the bottom 211 toward the light source module 30, and is formed in a shape that is symmetrical with respect to the optical axis of the light source 31. The side wall 212 has an incident surface 2121 and a total reflection surface 2122.

[0032] The incident surface 2121 is a surface of the side wall 212 onto which illumination light emitted from the light source 31 is incident, and is formed as a curved surface that is convex toward the light exit surface 22. The curved surface of the incident surface 2121 is a part of a sphere, but may also be a part of the surface of an ellipsoid.

[0033] The total reflection surface 2122 is formed as a curved surface that is convex toward the light exit surface 22. The total reflection surface 2122 is, for example, a curved surface that diverges toward the light source 31. In other words, the total reflection surface 2122 has an outwardly curved shape that diverges from the light source module 30 toward the light exit surface 22, like the bell of a trumpet or a morning glory flower. The curved surface of the total reflection surface 2122 is a part of a sphere, but may also be a part of the surface of an ellipsoid. The radius of curvature of the total reflection surface 2122 is, for example, 40 mm. The radius of curvature of the total reflection surface 2122 is not particularly limited, as long as it can diffuse light more efficiently, for example, in the range of 10 mm to 100 mm.

[0034] Flat plate portion 23 is formed in a flat plate shape. The thickness of flat plate portion 23 is, for example, in the range of 1 mm to 10 mm, and is 2.5 mm as one example. The front surface of flat plate portion 23 is light emitting surface 22. Light emitting surface 22 is a flat surface that emits light that has passed through bottom portion 211 and light that has been reflected by total reflection surface 2122. Light emitting surface 22 has portion 22a facing incident portion 21 and portion 22b that does not face incident portion 21. Light that has passed through luminous intensity distribution control member 20 is emitted from portion 22a and portion 22b.

[0035] The incident portion 21 is formed so that its maximum width is greater than its thickness. The maximum width of the incident portion 21 is the maximum width of the incident portion 21 when viewed along the optical axis (in a plan view). When the shape of the incident portion 21 in a plan view is a circle centered on the optical axis, the maximum width of the incident portion 21 is its diameter, specifically, "A" shown in FIG. 3. The thickness of the incident portion 21 is the length of the incident portion 21 along the optical axis, and is the maximum height of the incident portion 21 from the rear surface of the flat plate portion 23, specifically, "B" shown in FIG. 3. For example, the ratio "A":"B" is in the range of 5:1 to 1:1, and is 17:5 as an example.

[0036] The light source 31 emits illumination light toward the bottom 211 and the sidewall 212, more specifically, toward the inside of a space formed by the bottom 211 and the incident surface 2121. Here, the width of the bottom 211 is greater than the height of the sidewall 212 from the bottom 211. The width of the bottom 211 is the width of the bottom 211 when viewed along the optical axis (in a plan view). If the shape of the bottom 211 in a plan view is a circle centered on the optical axis, the width of the bottom 211 is its diameter, specifically, "W" shown in FIG. 3. The height of the sidewall 212 from the bottom 211 is the length of the incident surface 2121 along the optical axis, and is the height of the incident surface 2121 from the edge of the bottom 211, specifically, "H" shown in FIG. 3. For example, the ratio "W":"H" is in the range of 10:1 to 1:1, and is 5:1, for example. The space formed by the bottom 211 and the incident surface 2121 is roughly frusto-conical in shape, with the sides curved convexly and the top surface curved concavely, and with the diameter of the bottom surface greater than the height.

[0037] The numerical values ​​shown above are the numerical values ​​when the shortest distance between bottom 211 and light source 31 is approximately 1.5 mm, and these numerical values ​​can be changed as appropriate depending on the distance between bottom 211 and light source 31, that is, the positional relationship between light distribution control member 20 and light source module 30. Furthermore, these numerical values ​​can be changed as appropriate depending on the size of light source 31 and the distance between multiple adjacent light sources 31.

[0038] [Light distribution using light distribution control components] The following describes the path of light emitted from one light source 31 and incident on light distribution control member 20 in lighting fixture 10. Fig. 4 is a diagram showing the path of light passing through bottom 211 of lighting fixture 10 according to the embodiment. Fig. 5 is a diagram showing the path of light passing through incident surface 2121 of lighting fixture 10 according to the embodiment. Note that in Figs. 4 and 5, light source 31 is considered to be a point light source for convenience. Also, while Fig. 3 shows the curves of incident surface 2121 and total reflection surface 2122 exaggeratedly, Figs. 4 and 5 show them in shapes according to their actual dimensional ratios without exaggeration.

[0039] 4 shows the path of light that passes through bottom 211, out of the light that enters incident portion 21 from light source 31. Because bottom 211 is a curved surface that is slightly convex toward light source 31, the path of light that passes through bottom 211 has a slightly narrower spread compared to the spread of light source 31.

[0040] 5 shows the path of light that passes through incident surface 2121, out of the light that enters incident unit 21 from light source 31. The light that passes through incident surface 2121 is reflected by total reflection surface 2122 and emitted from light exit surface 22.

[0041] Because incident surface 2121 is a curved surface that is convex toward light exit surface 22, it is possible to diffuse light over a wide range of total reflection surface 2122. By diffusing light over a wider range of total reflection surface 2122, it is possible to make the light that is reflected by total reflection surface 2122 and emitted from light exit surface 22 more uniform. Light emitted from light source 31 is refracted by incident surface 2121 in a direction forward of lighting device 10 and proceeds toward total reflection surface 2122. Because total reflection surface 2122 is a curved surface that is convex toward light exit surface 22, the path of light that passes through incident surface 2121 and is reflected by total reflection surface 2122 is such that the light diffuses after leaving light exit surface 22.

[0042] As shown in FIGS. 4 and 5, at least one of the plurality of incident portions 21 that luminous intensity distribution control member 20 has distributes light incident from light source 31 so as to diffuse the light.

[0043] The plurality of incident portions 21 that light distribution control member 20 has have the same configuration, and each has the optical characteristics shown in Fig. 4 and Fig. 5. Therefore, light distribution control member 20 can use the plurality of incident portions 21 to cause light emitted from the corresponding light sources 31 to be emitted from light exit surface 22 so as to be diffused.

[0044] Furthermore, as described above, light distribution control member 20 and light source module 30 have portions through which structures such as screws 51 and mounting screws 52 for fixing them penetrate. These structures may block or diffuse the light emitted from light source 31.

[0045] However, lighting device 10 causes light emitted from light source 31 to enter incident portion 21 and then diffuses the light by bottom portion 211 and total reflection surface 2122, thereby preventing the light emitted from light source 31 from being blocked or diffused by members other than light distribution control member 20. In other words, lighting device 10 distributes the light emitted from light source 31 so as to diffuse it, thereby reducing the influence of structures around light source 31 and enabling the extraction of desired light.

[0046] [Light distribution curve] As described above, lighting fixture 10 has multiple incident portions 21, and each of the multiple incident portions 21 distributes light incident from light source 31 so as to diffuse it. Next, the light distribution of light emitted by lighting fixture 10 as a whole will be described using a light distribution curve. FIG. 6 is a graph showing the light distribution curve of lighting fixture 10. In FIG. 6, the light distribution curves of lighting fixtures 101 and 102 are shown in addition to the light distribution curve of lighting fixture 10.

[0047] A light distribution curve is a curve that shows the distribution of the intensity of light emitted from a lighting fixture in each direction.

[0048] Lighting fixture 101 is an example of a conventional lighting fixture, and is characterized in that the optical panel that determines the light distribution has a total reflection surface that is convex toward light source module 30. The total reflection surface that is convex toward light source module 30 reflects light in a manner that concentrates the light, making this lighting fixture capable of illuminating a narrow area more brightly.

[0049] Lighting fixture 102 is also an example of a conventional lighting fixture, characterized in that the optical panel that determines the light distribution does not have an incident portion 21 (lens). Because both the incident and exit surfaces are flat, the incident and exit surfaces diffuse the light. This allows lighting to cover a wider area.

[0050] The vertical axis in Figure 6 shows the luminous intensity per 1 klm of luminous flux of light emitted by the lighting fixture on a logarithmic scale in units of [cd / klm]. The horizontal axis shows the angle with respect to the optical axis of the lighting fixture, i.e., the angle with respect to the direction forward of the lighting fixture, in units of [°].

[0051] 6, luminaire 10 does not exhibit a significant change in luminous intensity over the angle range of 0° to 45° relative to the optical axis. In contrast, luminaire 101 exhibits higher luminous intensity as the angle relative to the optical axis decreases over the range of 0° to 45°.

[0052] That is, lighting fixture 10 can illuminate an area with approximately the same illuminance at angles between 0° and 45° relative to the optical axis. In other words, lighting fixture 10 can illuminate a target area with uniform brightness. Here, the target area refers to the area that lighting fixture 10 aims to illuminate.

[0053] On the other hand, the luminous intensity of lighting device 10 decreases rapidly when the angle relative to the optical axis is greater than 60°. In contrast, the luminous intensity of lighting device 102 decreases more gradually even when the angle relative to the optical axis is greater than 60°.

[0054] That is, lighting device 10 irradiates a small amount of light in an area that is angled at an angle greater than 60° relative to the optical axis. In other words, lighting device 10 can illuminate an area with minimal light leakage and wasted light outside the target area.

[0055] From the above, lighting fixture 10 is a lighting fixture that can illuminate a target area with uniform brightness while minimizing light leakage outside the target area. In other words, lighting fixture 10 can illuminate a target area with uniform brightness more efficiently.

[0056] [Actual light distribution] Next, the illuminance when a pool is actually illuminated using a plurality of lighting fixtures 10 will be described. Fig. 7 is a diagram illustrating the illuminance of the illuminated surface when lighting fixture 10 according to the embodiment is used. Fig. 8A is a diagram illustrating the illuminance of the illuminated surface when another lighting fixture 101 is used. Fig. 8B is a diagram illustrating the illuminance of the illuminated surface when yet another lighting fixture 102 is used.

[0057] In FIG. 7, the dotted line frame indicates the area of ​​pool 200. That is, it indicates the target area to be illuminated by lighting fixture 10. The starting points of the ten arrows in FIG. 7 indicate the installation positions of lighting fixture 10, and the directions of the arrows indicate the directions in which lighting fixture 10 emits light, in other words, the forward direction of lighting fixture 10. Lighting fixture 10 is installed, for example, on the wall of a pool facility, and the area outside pool 200 inside the starting points of the ten arrows corresponds to, for example, the poolside. FIG. 7 shows the illuminance of the illuminated surface, i.e., the water surface, when ten lighting fixtures 10 are installed on the wall of pool 200 and emit light obliquely downward in the direction of the arrows pointing toward the interior of pool 200. Areas L1 to L5 indicate areas where the illuminance exceeds a predetermined reference value. The predetermined reference values ​​are, in descending order of illuminance, area L1, area L2, area L3, area L4, and area L5. That is, area L1 is illuminated more brightly than area L2.

[0058] 8A and 8B are drawings corresponding to FIG. 7, and FIG. 8A shows the illuminance of the illuminated surface when lighting fixture 101 is used instead of lighting fixture 10, and FIG. 8B shows the illuminance of the illuminated surface when lighting fixture 102 is used instead of lighting fixture 10.

[0059] 7 and 8A, lighting fixture 10 reduces the illuminance unevenness in swimming pool 200 more than lighting fixture 101. The illuminance unevenness can be calculated, for example, by the ratio of the minimum illuminance value in swimming pool 200 to the average illuminance value in swimming pool 200.

[0060] Light distribution control member 20 diffuses the light, allowing lighting device 10 to irradiate the target area with light with less unevenness in illuminance. Light distribution control member 20 diffuses the light, allowing lighting device 10 to irradiate the target area with more uniform brightness.

[0061] Comparing FIG. 7 and FIG. 8B, lighting fixture 10 has less light leakage outside the illustrated area than lighting fixture 102. There is no area near the origin of the arrow in FIG. 8B where the illuminance is lower than L3. This indicates that light leakage outside the illustrated area, where pool 200 and the poolside are not illuminated, occurs. In contrast, the illuminance is lower than L3 near the origin of the arrow in FIG. 7. This indicates that light leakage outside the illustrated area is suppressed.

[0062] Lighting fixture 10 can irradiate light so as to minimize light leakage outside the illustrated area by controlling the light distribution using light distribution control member 20. Note that the illustrated area includes the target area.

[0063] Therefore, lighting device 10 is a lighting device that can illuminate a target area with uniform brightness and irradiate light in a manner that minimizes light leakage outside the target area.

[0064] [Effects, etc.] The technologies derived from the disclosure of this specification are, for example, the following technologies. Below, the technologies derived from the disclosure of this specification will be described together with the effects and the like obtained by the technologies.

[0065] Technology 1 relates to lighting fixture 10, which includes: a light source module 30 having a substrate 32 and a plurality of light sources 31 mounted on substrate 32; and a light distribution control member 20 that controls the light distribution of illumination light emitted from the plurality of light sources 31, wherein light distribution control member 20 has a light exit surface 22 and a plurality of incident sections 21 that are provided opposite light exit surface 22 to face each of the plurality of light sources 31, at least one of the plurality of incident sections 21 has a bottom 211 that faces one of the plurality of light sources 31 and a side wall 212 that protrudes from the edge of bottom 211 toward light source module 30, and side wall 212 has an incident surface 2121 on which the illumination light is incident and a total reflection surface 2122 that internally totally reflects the light that has entered from incident surface 2121, and total reflection surface 2122 is a curved surface that is convex toward light exit surface 22.

[0066] In such lighting fixture 10, light distribution control member 20 has total reflection surface 2122, which is a convex curved surface, and therefore light emitted from light source 31 can be distributed so as to be efficiently diffused within the target range. Therefore, the target range can be illuminated more efficiently with uniform brightness.

[0067] Furthermore, since the light distribution control member 20 of the lighting fixture 10 is a panel lens having an incident portion 21 and a light exit surface 22, the number of parts can be reduced compared to a lighting fixture in which the incident portion 21 and the flat portion 23 are separate components, that is, a lighting fixture in which the panel and lens are separate components.

[0068] Furthermore, since the light distribution control member 20 possessed by the lighting fixture 10 distributes the light emitted by the light source 31, it is possible to prevent the light emitted by the light source 31 from being blocked or diffused by structures around the light source 31 before it is emitted from the lighting fixture 10.

[0069] A second technique is lighting device 10 of the first technique, in which total reflection surface 2122 is a curved surface that widens toward the end, the degree of expansion of the diameter increasing with increasing distance from one light source 31.

[0070] Such lighting fixture 10 can distribute the light emitted by light source 31 so as to diffuse it by means of total reflection surface 2122.

[0071] Technology 3 is lighting fixture 10 of Technology 1 or 2, in which light exit surface 22 is a flat surface that emits light that has passed through bottom portion 211 and light that has been reflected by total reflection surface 2122.

[0072] In such a lighting device 10, the light emitting surface 22 is flat, and the light emitted by the light source 31 is emitted from a single wide plane with little leakage, thereby efficiently illuminating the target area with uniform brightness.

[0073] A fourth technique is lighting device 10 of any one of techniques 1 to 3, in which the maximum width of incident portion 21 is greater than the thickness of incident portion 21.

[0074] In such lighting fixture 10, light distribution control member 20 can diffuse the light emitted by light source 31 more efficiently.

[0075] Technique 5 is lighting fixture 10 of any one of techniques 1 to 4, in which the width of bottom 211 is greater than the height of sidewall 212 from bottom 211.

[0076] In such lighting fixture 10, light distribution control member 20 can more efficiently distribute the light emitted by light source 31.

[0077] (Other embodiments) Although the embodiments have been described above, the present disclosure is not limited to the above-described embodiments.

[0078] For example, in the above embodiment, the light source 31 is described as an LED, but a semiconductor light emitting element such as a semiconductor laser, or a solid-state light emitting element such as an organic EL (Electro Luminescence) element or an inorganic EL element may also be used.

[0079] Furthermore, for example, the light source may be realized as an LED element having an SMD (Surface Mount Device) structure, and the light source module may be an LED module having a so-called COB (Chip On Board) structure in which an LED chip is directly mounted on a substrate.

[0080] Furthermore, for example, all of incident sections 21 included in light distribution control member 20 have the same configuration, but are not limited to this. The multiple incident sections 21 included in light distribution control member 20 may include incident sections with different configurations.

[0081] Furthermore, the thickness of light distribution control member 20 is not particularly limited, but may be, for example, 0.5 mm or more at its thinnest part. This improves the moldability of light distribution control member 20.

[0082] Furthermore, the light exit surface 22 may not be flat, but may have a light diffusion (scattering) structure such as a structure formed by texturing. For example, the light exit surface 22 may be textured to form irregularities on the surface of the light exit surface 22. This allows the light exit surface 22 to reduce light by diffusing (scattering) the light.

[0083] This disclosure also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art would think of, or forms realized by arbitrarily combining the components and functions of each embodiment within the scope of this disclosure. [Explanation of symbols]

[0084] 10 Lighting fixtures 20 Light distribution control member 21 Input part 211 Bottom 212 Side wall 2121 Incidence plane 2122 Total reflection surface 22 Light exit surface 30 Light Source Module 31 Light source 32 PCB

Claims

1. a light source module having a substrate and a plurality of light sources mounted on the substrate; a light distribution control member for controlling the light distribution of illumination light emitted from the plurality of light sources, the light distribution control member has a light emitting surface and a plurality of incident portions provided on the opposite side of the light emitting surface so as to face the plurality of light sources, At least one of the plurality of incident portions has a bottom portion facing one of the plurality of light sources and a sidewall protruding from an edge of the bottom portion toward the light source module, the side wall has an incident surface on which the illumination light is incident and a total reflection surface that internally reflects the light incident from the incident surface; the total reflection surface is a curved surface that is convex toward the light exit surface, Lighting fixtures.

2. The total reflection surface is a curved surface having a diverging shape whose diameter increases as the distance from the one light source increases.

10. The lighting fixture of claim 1.

3. the light exit surface is a plane that emits light that has passed through the bottom portion and light that has been reflected by the total reflection surface; 3. A lighting fixture according to claim 1 or 2.

4. The maximum width of the incident portion is greater than the thickness of the incident portion.

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

5. The width of the bottom is greater than the height of the side wall from the bottom.

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

Images