Lighting fixtures

Abstract

To suppress influence on optical performance resulting from thermal expansion even if a heat resistant material having a high linear expansion coefficient such as silicone is used for a lens.SOLUTION: A lighting apparatus 1 includes: a light source 5; a lens 21 covering the light source 5; and a first support member 12 and a second support member 13 supporting the lens 21. The lens 21 is composed of a heat resistant material with a linear expansion coefficient of equal to or larger than 10×10-5 / K. The first support member 12 has a pair of bosses 51 which function as a pair of first engagement parts for regulating the movement of the lens 21. The pair of bosses 51 are arranged on or in the vicinity of an X-axis extending in a direction along an attachment surface through a predetermined reference position of the lens 21, and regulate the movement of the lens 21 in a direction orthogonal to the X-axis from the reference position.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] This invention relates to lighting fixtures. [Background technology]

[0002] Generally, lighting fixtures consist of a light source, a lens covering the light source, and a support member for the lens and other components. These types of lenses include those molded from resin using materials such as acrylic (PMMA) or polycarbonate (PC) (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-158078 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] When lighting fixtures are miniaturized or power consumption increases, the lens temperature rises further, potentially leading to insufficient heat resistance for materials like PMMA and PC. If a lens were to be manufactured using a silicone material with a higher heat resistance temperature than PMMA or PC, the coefficient of linear expansion of silicone is approximately five times or more that of PMMA or PC. Therefore, the expected optical properties may not be met due to the effects of thermal expansion.

[0005] This invention has been made in view of the above circumstances, and aims to suppress the impact on optical performance caused by thermal expansion, even when heat-resistant materials with a high coefficient of thermal expansion, such as silicone, are used for lenses. [Means for solving the problem]

[0006] The present invention relates to a lighting fixture comprising a light source, a lens covering the light source, and a first support member and a second support member supporting the lens, wherein the lens has a coefficient of linear expansion of 10 × 10 -5The first support member is made of a heat-resistant material with a temperature of 1 / K or higher, and has a pair of first engaging portions that restrict the movement of the lens, the pair of first engaging portions are provided on or near a first axis that extends in a direction along the mounting surface to which the lens is attached, passing through a predetermined reference position of the lens, and restrict the movement of the lens from the reference position in a direction perpendicular to the first axis.

[0007] The present invention relates to the above-mentioned lighting fixture, wherein the first support member has a second engaging portion that restricts the movement of the lens, and the second engaging portion is provided on or near a second axis that passes through the reference position and is perpendicular to the first axis, and restricts the movement of the lens from the reference position in the direction perpendicular to the second axis.

[0008] The present invention is characterized in that, in the above-mentioned lighting fixture, one of the first engaging portion and the lens, and one of the second engaging portion and the lens, have a boss that protrudes in the thickness direction of the lens, and the other has a fitting portion into which the boss fits.

[0009] The present invention is characterized in that the above-mentioned lighting fixture includes clamping portions that sandwich a flat portion parallel to the mounting surface provided on the lens from both sides in the thickness direction of the lens.

[0010] The present invention is characterized in that, in the above-mentioned lighting fixture, the clamping portion has a predetermined gap between it and the flat portion.

[0011] The present invention is characterized in that, in the above-mentioned lighting fixture, the clamping portion is made by sandwiching the flat portion between the first support member and the second support member, which are separate components.

[0012] The present invention is characterized in that, in the above-mentioned lighting fixture, the reference position is the center of the lens or its vicinity.

[0013] In the above lighting fixture, the present invention is characterized in that it has a plurality of the light sources, the lenses are provided one-to-one with the light sources, and each of the lenses is independently supported by the first support member and the second support member.

[0014] In the above lighting fixture, the present invention is characterized in that the lens is a lens using a silicone material.

Effect of the Invention

[0015] According to the present invention, even if a heat-resistant material having a large linear expansion coefficient such as silicone is used for the lens, the influence on the optical performance caused by thermal expansion can be suppressed.

Brief Description of the Drawings

[0016] [Figure 1] It is a view showing a lighting fixture. [Figure 2] It is a plan view of a light source unit. [Figure 3] It is a view showing a lens unit. [Figure 4] It is a view showing a lens. [Figure 5] It is a view showing a first support member. [Figure 6] It is a view showing the state of holding the lens from the side of the second support member. [Figure 7] It is a side sectional view of the state of holding the lens. [Figure 8] It is a view showing the case where other fitting portions and other bosses on the Y-axis are provided.

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a lighting fixture 1. More specifically, FIG. 1(A) is a side view of the lighting fixture 1, and FIG. 1(B) is a plan view of the lighting fixture 1 (viewed from below). Lighting fixture 1 is mounted at a high position such as on a pole or roof and illuminates a competition area such as a tennis court from above. The competition area can also be called the lighting area or the illuminated surface. Lighting fixture 1 comprises a light source unit 2 and a housing 3 that covers the light source unit 2 from above, and the housing 3 is adjustable in angle θK by a U-shaped arm 4.

[0018] The housing 3 has a hollow shape with an opening at the bottom, and houses the light source unit 2 inside the housing 3. The light source unit 2 emits illumination light downwards and forwards from the housing 3. The fixture angle θK is set, for example, within a range of 0° to 20° upwards with respect to the horizontal plane. By setting the fixture angle θK to an appropriate value, the light from the light source unit 2 can be directed towards the competition area. The fixture angle θK may be changed as appropriate within the range of 0° to 20°, or it may be changed to an angle outside the above range depending on the installation conditions of the lighting fixture 1. Unless otherwise specified, directions in this description are relative to lighting fixture 1. In each figure, the symbol FR indicates the forward direction of lighting fixture 1, and the symbol UP indicates the upward direction.

[0019] Figure 2 is a plan view of the light source unit 2. The light source unit 2 comprises multiple light sources 5 and multiple lens units 11 that control the light distribution from each light source 5. Each light source 5 is a planar light source that emits planar light in a roughly circular (possibly square) shape when viewed from above, by densely arranging multiple (four in this configuration) light-emitting elements, such as a COB type LED. The lens unit 11 is a component that integrally includes multiple (eight in this embodiment) lenses 21 that cover the light source 5. A lens 21 is provided for each light source 5, and the lenses 21 are spaced apart from each other. In other words, there is a one-to-one relationship between the light source 5 and the lens 21, and gaps are provided between the lenses 21. This prevents heat from the light source 5 from affecting a lens 21 other than the one into which the light from the light source 5 enters. Furthermore, even if a lens 21 expands due to the heat from the light source 5, this expansion is prevented from affecting adjacent lenses 21.

[0020] Since the lens unit 11 has multiple lenses 21 integrated into one unit, the multiple lenses 21 can be attached and detached together, which is advantageous for improving ease of assembly and other aspects. In this configuration, each lens unit 11 is made of the same part, but the number of lens units 11 and the number of lenses 21 in each lens unit 11 may be changed as appropriate. Also, any of the lens units 11 or lenses 21 may have different shapes.

[0021] By the way, if the lighting fixture 1 is miniaturized or its power consumption increases, the temperature of the lens 21 will rise, and PMMA or PC may not have sufficient heat resistance. To ensure sufficient heat resistance, it is conceivable to use a silicone material for the lens 21, which has a higher heat resistance temperature than PMMA or PC. However, the coefficient of thermal expansion of silicone material is 25 × 10⁻⁶. -5 ~40×10 -5 Since it is / K, 5 × 10 of PMMA -5 ~9×10 -5 / K and PC 6x10 -5 ~7×10 -5 Compared to / K, the coefficient of linear expansion is approximately 5 to 8 times higher, and there is a risk that the expected optical performance may not be met due to positional displacement caused by thermal expansion. Thus, prioritizing heat resistance increases the coefficient of thermal expansion, resulting in significant displacement due to thermal expansion in conventional lens support structures. This configuration, however, uses a lens support structure that is less affected by the coefficient of thermal expansion, making it possible to select lens materials that prioritize heat resistance.

[0022] The configuration of the lens unit 11, including the lens support structure, will be described below. Figure 3 shows the lens unit 11. More specifically, Figure 3(A) is a side view taken from the M direction in Figure 2, and Figure 3(B) is an exploded perspective view of the lens unit 11. The lens unit 11 comprises a lens 21 and a pair of support members 12 and 13 that hold the lens 21. In the following description, when the pair of support members 12 and 13 are described separately, the support member 12 on which the lens 21 is placed will be referred to as the "first support member 12," and the other support member 13 will be referred to as the "second support member 13."

[0023] The lens 21 is made of a transparent material and integrally has a plate-shaped flange portion 21F that protrudes around the lens body 21A. The support members 12 and 13 are stacked in a direction that coincides with the thickness direction of the lens 21, and clamp the flange portion 21F of the lens 21 from both sides in the thickness direction of the lens 21. The flange portion 21F is the thin part of the lens 21 in the thickness direction, and is formed in a flat plate shape; it can also be called a flat plate portion. The flange portion 21F is positioned between the support members 12 and 13 with a predetermined gap S, as will be described later.

[0024] As shown in Figure 3(B), the first support member 12 is formed as a frame-shaped frame having a plurality of independent openings 12A through which light from the light source 5 passes. The first support member 12 has recessed mounting portions 12B that extend along the outer edge of each opening 12A, and the flange portion 21F of the lens 21 is placed on each mounting portion 12B. The second support member 13 is formed in a frame-shaped shape having a plurality of independent openings 13A through which light from the light source 5 passes, and has a pressing portion 13B that presses the flange portion 21F of the lens 21 from the opposite side of the first support member 12. The lens 21 is clamped from both sides in the thickness direction by these mounting portion 12B and pressing portion 13B. These mounting portion 12B and pressing portion 13B correspond to the "clamping portion that sandwiches the flat portion (flange portion 21) parallel to the mounting surface (mounting portion 12B) provided on the lens 21 from both sides in the thickness direction of the lens 21" of the present invention.

[0025] As shown in Figure 3, the lens unit 11 is provided with a reflecting part 31 located behind the lens 21, which reflects a portion of the light from the lens 21. The reflective portion 31 is shaped to protrude downward from the lighting fixture 1 (corresponding to the upward direction in Figure 3) behind each lens 21, and is integrally attached to the first support member 12 by aluminum die-casting (ADC12). A reflective portion 31 is provided for each lens 21, and reflects the light emitted from each lens 21 to the rear of the fixture in a direction other than the rear of the fixture (forward direction, etc.). Each reflective section 31 can reduce light leakage to the rear of the fixture, and is advantageous in increasing the amount of light irradiated in front of and below the fixture, thereby improving the efficiency of light utilization. The material of the first support member 12, including the reflective portion 31, does not have to be an aluminum alloy; any material can be used as long as it is heat-resistant and the reflection function works. For example, the first support member 12 may be made of another metal material or a resin material. For example, the first support member 12 may be made of a resin molded product with a reflective surface provided by aluminum vapor deposition or the like. However, it is necessary to consider that deformation and deterioration due to heat will be within a predetermined allowable range.

[0026] Furthermore, the lens unit 11 is provided with a light-shielding portion 33 located behind the lens 21, which blocks light that is not reflected by the reflecting portion 31. The light-shielding portion 33 is located behind the reflecting portion 31, protrudes further downward than the reflecting portion 31, and is formed in an L-shape cross-section with its extended end (corresponding to the lower part of the light-shielding portion 31) protruding toward the lens 21. At least a portion of the light emitted from the lens 21 to the rear of the device that does not enter the reflecting portion 31 enters the light-shielding portion 33, and the incident light is shielded. This further reduces light leakage to the rear of the device.

[0027] In this configuration, a light-shielding section 33 is provided for each lens 21 of the lens unit 11 that is located on the rear side of the device, and is integrally provided with the second support member 13 by aluminum die-casting (ADC12). The light incident surface (corresponding to the reflective surface) of the reflective section 31 may be a mirror surface or a diffuse reflective surface. Furthermore, the light incident surface of the light shielding section 33 is not limited to a low-reflectivity surface, but may be any surface that reduces light leakage to the rear of the device, and may be a mirror surface or a diffuse reflective surface. The position, shape, and number of the reflective section 31 and the light shielding section 33 may be changed as appropriate. The material of the second support member 13, including the light-shielding portion 33, does not have to be an aluminum alloy; any material can be used as long as it is heat-resistant and functions as a light shield. For example, the second support member 13 may be made using other metal or resin materials. However, it is necessary to consider that deformation and deterioration due to heat will be within a predetermined acceptable range.

[0028] Figure 4 shows the lens 21. The lens 21 is an optical component that controls the light distribution from the light source 5 to light suitable for illuminating the competition area, and each lens 21 has the same shape. Each lens 21 is integrally molded with the flange portion 21F by resin molding using silicone material, and is formed into a rectangular shape in plan view. The center 21C of lens 21 approximately coincides with the central axis 5C of light source 5 in a plan view. If lens 21 is rectangular, a straight line is drawn perpendicular to each side E1 and E2 at a point where the length of the line is half, and the point where these lines intersect is the center 21C of lens 21. If lens 21 is circular, the center of the circle is the center 21C of lens 21. If lens 21 is elliptical, the midpoint of the two foci is the center 21C of lens 21.

[0029] The lens 21 integrally comprises a first lens section 22 located in front of and below the light source 5, and a second lens section 23 located behind and below the light source 5. The first lens section 22 is a lens that controls the light distribution in front of and below the device. The second lens section 23 is a lens that controls the light distribution to the rear and downward of the fixture, and has a plurality of protrusions that project downward toward the fixture. Each protrusion has a refractive surface consisting of an inclined surface that receives light from the light source 5 at an angle in which at least a portion of the light does not undergo total internal reflection, and refracts that light toward the illuminated area (competition area). These plurality of protrusions effectively suppress light leakage toward the rear of the fixture, that is, light leakage in the opposite direction to the irradiation direction, and are advantageous in improving the average illuminance of the competition area.

[0030] Figure 4 shows the X and Y axes extending in a direction along the mounting portion 12B, which corresponds to the mounting surface of the lens 21, passing through the center 21C of the lens 21. The X-axis extends in the left-right direction of the lighting fixture 1, and the Y-axis extends in the front-back direction of the lighting fixture 1. The X-axis and Y-axis are orthogonal to each other. The X-axis corresponds to the "first axis" of the present invention, and the Y-axis corresponds to the "second axis" of the present invention. The flange portion 21F of the lens 21 is provided with a pair of fitting portions 41 spaced apart on the X-axis, into which the boss 51 (Figure 4) of the first support member 12 fits. Furthermore, the flange portion 21F of the lens 21 is provided with another fitting portion 42 at a position close to the Y-axis, into which another boss 52 (Figure 4) of the first support member 12 fits. These fitting portions 41 and 42 are formed in a circular or semicircular notch shape, but their shape may be changed to an appropriate shape, for example, a round hole, an elongated hole, an elliptical hole, or a square hole.

[0031] Figure 5 shows the first support member 12. For ease of explanation, some of the lenses 21 are shown as dashed lines (two-dot lines) in Figure 5. The first support member 12 is integrally provided with a pair of bosses 51 that protrude in the thickness direction of the lens 21 at positions corresponding to a pair of fitting portions 41 of the lens 21, and an additional boss 52 that protrudes in the thickness direction of the lens 21 at a position corresponding to another fitting portion 42 of the lens 21.

[0032] When considering expansion in the X direction, lens 21 expands thermally in the positive and negative directions of the X axis, with the Y axis as the reference point. In other words, the expansion in the X direction does not affect the Y direction. Furthermore, when considering expansion in the Y direction, lens 21 expands thermally in the positive and negative directions of the Y axis with respect to the X axis. In other words, the expansion in the Y direction does not affect the X direction. In this configuration, the pair of fitting portions 41 and boss 51 on the X-axis allow for setting the X-direction clearance between the lens 21 and the fitting portion, while ignoring expansion in the Y-direction. In other words, the pair of fitting parts 41 and the boss 51 on the X-axis are fitted together with a small clearance in the X-direction (also called loose fitting), which allows for thermal expansion of the lens 21 in the X-direction while suppressing movement of the lens 21 in the Y-direction, and also suppresses displacement of the center 21C of the lens 21 in the Y-direction.

[0033] Furthermore, the other fitting portions 42 and other bosses 52 near the Y-axis allow for setting the Y-direction clearance between the lens 21 and the other fitting portions 42 and other bosses 52, while ignoring expansion in the X-direction. In other words, by fitting (also called loose fitting) the other fitting parts 42 and other bosses 52 near the Y axis with a small clearance in the Y direction, it is possible to allow thermal expansion of the lens 21 in the Y direction while suppressing the movement of the lens 21 in the X direction, and also suppressing the displacement of the center 21C of the lens 21 in the X direction. Each clearance should be set to an appropriate value considering the coefficient of thermal expansion of the lens 21, the operating temperature, etc.

[0034] In this way, the pair of fitting parts 41 and boss 51 suppress the movement of the lens 21 in the Y direction, and the other fitting part 42 and other boss 52 suppress the movement of the lens 21 in the X direction, thereby suppressing the impact on optical performance caused by thermal expansion of the lens 21. The pair of bosses 51 correspond to the "first engaging portion that restricts the movement of the lens" of the present invention, and the boss 52 corresponds to the "second engaging portion that restricts the movement of the lens" of the present invention.

[0035] Figure 6 shows the lens 21 being held, viewed from the second support member 13 side. The flange portion 21F is shown as a dashed line in Figure 6. As shown in Figure 6, the second support member 13 is fixed to the first support member 12 by a fastening member 55. The second support member 13 functions as a retaining member that presses substantially the entire flange portion 21F toward the first support member 12. This second support member 13 prevents the lens 21 from falling out in the thickness direction and holds the fitting portions 41, 42 and bosses 51, 52 in a fitted state.

[0036] Figure 7 is a side cross-sectional view showing the lens 21 in a holding position. As shown in Figure 7, the thickness LB of the flange portion 21F is formed to be thinner than the distance LA between the first support member 12 and the second support member 13 (corresponding to the distance between the mounting portion 12B and the surfaces where the first support member 12 and the second support member 13 come into contact), thereby creating a gap S between the flange portion 21F and the second support member 13. This gap S is set to an appropriate clearance in the lens thickness direction of the flange portion 21F, ensuring a predetermined clearance at least at room temperature (corresponding to the non-operating state of the lighting fixture 1). This gap S allows for thermal expansion of the flange portion 21F in the lens thickness direction while restricting the movement of the flange portion 21F in the thickness direction to an appropriate range. Even when the lighting fixture 1 is operating, the gap S does not become zero, but is designed to remain smaller than when it is not operating. This is because if the gap disappears during expansion, the movement of the lens 21 will be restricted, causing the lens 21 to be fixed in an off-center position relative to the mounting surface (the surface of the mounting portion 12B), making it impossible to achieve the desired optical performance.

[0037] Here, the thickness of the flange portion 21F is the thinnest part of the lens 21, and is at least thinner than the first lens portion 22 and the second lens portion 23. Since the amount of thermal expansion in the lens thickness direction is proportional to the length in the lens thickness direction, the amount of thermal expansion of the flange portion 21F is smaller than the amount of thermal expansion of the first lens portion 22 and the second lens portion 23. In this configuration, the flange portion 21F, which is the part of the lens 21 with the smallest thermal expansion, is held by the support members 12 and 13, thereby suppressing movement of the lens 21 in the thickness direction relative to the support members 12 and 13. By suppressing movement of the lens 21 in the thickness direction, the impact of thermal expansion on the optical performance of the lens 21 can be suppressed.

[0038] In this configuration, the case where other fitting parts 42 and other bosses 52 are provided near the Y-axis has been described, but as illustrated in Figure 8, other fitting parts 42 and other bosses 52 may also be provided on the Y-axis. By providing other fitting parts 42 and other bosses 52 on the Y-axis, the displacement of the center 21C of the lens 21 in the X-direction can be further suppressed. In addition, multiple other fitting parts 42 and other bosses 52 may be provided at intervals. However, if other fitting parts 42 and other bosses 52 are provided on the Y-axis, the entire lens 21 and the first support member 12 tend to become larger in the Y-direction in order to secure space for the other fitting parts 42 and other bosses 52. Therefore, to avoid increasing the size in the Y-direction, a configuration in which other fitting parts 42 and other bosses 52 are provided near the Y-axis, as shown in Figure 5, is preferable.

[0039] Furthermore, although this configuration describes a case where a pair of fitting portions 41 and bosses 51 are provided on the X-axis, one or more fitting portions 41 and bosses 51 may be provided near the X-axis. Furthermore, the fitting portions 41, 42 and bosses 51, 52 are not limited to being located on or near the X, Y axes passing through the center 21C of the lens 21. In short, the positions of the fitting portions 41, 42 and bosses 51, 52 may be changed within a range that can suppress the impact of thermal expansion on the optical performance of the lens 21. That is, the center 21C of the lens 21 is an example of the "reference position" of the present invention, but the reference position may be changed as appropriate, for example, to the center of gravity of the lens 21.

[0040] Furthermore, although this configuration describes the case where bosses 51 and 52 are provided on the first support member 12 side and fitting portions 41 and 42 are provided on the lens 21 side, the positional relationship between bosses 51 and 52 and fitting portions 41 and 42 may be reversed, so that bosses 51 and 52 are provided on the lens 21 side facing the first support member 12 side, and fitting portions 41 and 42, such as holes, are provided on the first support member 12 side. If the aforementioned holes are designed to a size that takes into account the amount of thermal expansion of the lens 21 and the movement of the lens 21 due to thermal expansion, the same effect as described in this configuration can be expected. When considering the assembly of the lens unit 11, in this configuration, the assembler can visually check the fitting state of the bosses 51, 52 and the fitting parts 41, 42, as shown in Figure 5, making the assembly work easier. In contrast, if the relative positions of the bosses 51, 52 and the fitting portions 41, 42 are reversed, the holes can be seen, but the bosses 51, 52 on the lens 21 are hidden behind the lens 21 and cannot be seen, which may make assembly somewhat difficult. In this case, by making the shape of the mounting portion 12B of the support member 12 similar to the shape of the lens 21 (flange portion) and making it larger by the amount of clearance, it becomes easier to assemble the lens 21 in the correct position, and if the bosses 51, 52 are not fitted into the holes, the lens 21 cannot be sandwiched between the two support members 12, 13, making it easier to avoid assembly defects.

[0041] As described above, in the lighting fixture 1 of this embodiment, the lens 21 is made of a silicone material, and the first support member 12 is equipped with a pair of bosses 51 that engage with the lens 21 and function as a pair of first engaging parts that restrict the movement of the lens 21. The bosses 51 are provided on or near the X-axis (first axis) that extends in a direction along the mounting surface through the center 21C, which is a predetermined reference position of the lens 21, and restrict the movement of the lens 21 from the reference position in the Y direction perpendicular to the X-axis. According to this lens support structure, even if a silicone material made of a heat-resistant material with a large linear expansion coefficient is used for the lens 21, the movement of the lens 21 in the Y direction can be suppressed, and the influence on the optical performance caused by thermal expansion can be suppressed. Therefore, a lighting fixture 1 with high heat resistance of the lens 21 and excellent optical performance can be obtained, which is advantageous for miniaturization and high output of the lighting fixture 1.

[0042] In addition, the first support member 12 includes a boss 52 that functions as a second engaging portion for restricting the movement of the lens 21. The boss 52 is provided on or near the Y-axis (second axis) perpendicular to the X-axis passing through the center 21C that is a predetermined reference position of the lens 21, and restricts the movement of the lens 21 in the X direction perpendicular to the Y-axis from the reference position. According to this configuration, the movement of the lens 21 in the X direction can be suppressed, and the influence on the optical performance caused by thermal expansion can be suppressed. Therefore, even if a silicone material made of a heat-resistant material with a large linear expansion coefficient is used for the lens 21, a lighting fixture 1 with excellent optical performance can be obtained, which is advantageous for miniaturization and high output of the lighting fixture 1.

[0043] In addition, according to this lens support structure, a lens support structure that is less affected by the linear expansion coefficient of the lens 21 can be obtained, so that it is possible to select a lens material that prioritizes heat resistance, and it is not necessary to use an expensive material (a heat-resistant material with a relatively small linear expansion coefficient) used for special purposes. For example, it is not limited to the case where a silicone material is used for the lens 21. Even if a material such as fluorine, which has a larger linear expansion coefficient and higher fluidity compared to PMMA or PC generally used for lenses, is used, the influence on the optical performance caused by thermal expansion can be suppressed. The linear expansion coefficient of the fluorine material is about 10×10 -5 / K. According to the lens support structure of the present invention, even when the linear expansion coefficient is 10×10 -5 / K or more, the influence on the optical performance caused by thermal expansion can be appropriately suppressed.

[0044] Furthermore, the bosses 51 and 52 protrude in the thickness direction of the lens 21 and fit into the fitting portions 41 and 42 provided on the lens 21, respectively, thereby suppressing the movement of the lens 21 in the Y and X directions. This allows for the suppression of the movement of the lens 21 with a simple configuration. Furthermore, since multiple bosses 51 are provided on the X-axis to restrict the movement of the lens 21 in the Y-direction, and other bosses 52 are provided near the Y-axis to restrict the movement of the lens 21 in the X-direction, there is no need to provide other fitting portions 42 on the Y-axis of the lens 21 that fit into the bosses 52. Therefore, it becomes easier to shorten the length of the lens 21 and the first support member 12 in the Y-direction.

[0045] Furthermore, the support members 12 and 13 are equipped with a mounting portion 12B and a pressing portion 13B that function as clamping portions that sandwich the flange portion 21F, which corresponds to the flat portion provided on the lens 21, from both sides in the thickness direction of the lens 21, thereby suppressing movement of the lens 21 in the thickness direction. Moreover, since the flange portion 21F is a relatively thin part of the lens 21, the amount of thermal expansion of the flange portion 21F is smaller than that of other parts of the lens 21, thus suppressing movement of the lens 21 in the thickness direction relative to the support members 12 and 13.

[0046] Furthermore, since the mounting portion 12B and the pressing portion 13B, which function as clamping portions, have a predetermined gap S between them and the flange portion 21F, the movement of the lens 21 in the thickness direction of the flange portion 21F can be restricted to an appropriate range while allowing thermal expansion of the flange portion 21F in the thickness direction of the lens.

[0047] Furthermore, since the flange portion 21F is sandwiched between the separate support members 12 and 13, the lens 21 can be supported by the support members 12 and 13 with a simple configuration and simple assembly procedure. Furthermore, since fitting portions 41, 42 and bosses 51, 52 are provided on the X-axis, Y-axis, or nearby, extending in a direction along the mounting surface through the center 21C of the lens 21, displacement of the center 21C of the lens 21 due to thermal expansion can be suppressed.

[0048] Furthermore, the lighting fixture 1 has multiple light sources 5, and the lenses 21 are provided in a one-to-one ratio with the light sources 5, and each lens 21 is independently supported by support members 12 and 13. This allows the temperature of each lens 21 to be uniform even when away from the light source, and suppresses non-uniformity in the amount of thermal expansion of each lens 21.

[0049] The embodiments described above are merely illustrative examples of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the invention. For example, although the example given illustrates a case where bosses 51 and 52 are provided on the support members 12 and 13 side and fitting portions 41 and 42 are provided on the lens 21 side, the positional relationship between the bosses 51 and 52 and the fitting portions 41 and 42 may be reversed, so that the fitting portions 41 and 42 are provided on the support members 12 and 13 side and the bosses 51 and 52 are provided on the lens 21 side. In this case, the pair of fitting portions 41 on the support members 12 and 13 side correspond to the "first engaging portion" of the present invention, and the fitting portion 42 on the support members 12 and 13 side corresponds to the "second engaging portion" of the present invention.

[0050] Furthermore, the configuration is not limited to providing the lens positioning bosses 51, 52 or fitting portions 41, 42 on the first support member 12 side, but may also be provided on the second support member 13 side. Furthermore, although the present invention has been described in the context of applying it to a lighting fixture 1 for illuminating a competition area, it is not limited to this and can be broadly applied to lighting fixtures for illuminating various lighting areas. [Explanation of Symbols]

[0051] 1 Lighting fixtures 2 Light source units 3 cabinets 5 light source 11 Lens Unit 12. First support member (support member) 12B Mounting section (clamping section) 13. Second support member (support member) 13B Clamping part (gripping part) 21 lenses 21C Lens center (reference position) 21F Flange section (designated flat section) 31 Reflector 33 Light-shielding part 41, 42 Fitting part 51 Boss (First Engaging Part) 52 Boss (Second Engaging Part) S Gap (specified gap) X-axis (1st axis) Y-axis (second axis)

Claims

1. In a lighting fixture comprising a light source, a lens covering the light source, and a first support member and a second support member supporting the lens, The aforementioned lens has a coefficient of linear expansion of 10 × 10 －５ Made of heat-resistant material with a temperature of / K or higher, The first support member has a pair of first engaging portions that restrict the movement of the lens, and a second engaging portion that restricts the movement of the lens. The pair of first engaging portions are provided on or near a first axis that extends in a direction along the mounting surface to which the lens is attached, passing through a predetermined reference position of the lens, and restrict the movement of the lens from the reference position in a direction perpendicular to the first axis. The second engaging portion is provided on or near the first direction along the second axis perpendicular to the first axis with respect to the reference position, and restricts the movement of the lens from the reference position in the direction perpendicular to the second axis. The lens further comprises a reflective portion that reflects light, located in the direction opposite to the first direction with respect to the reference position when viewed from the thickness direction of the lens. A lighting fixture characterized by the following features.

2. The lighting fixture according to claim 1, characterized in that one of the first engaging portion and the lens, and one of the second engaging portion and the lens, have a boss that protrudes in the thickness direction of the lens, and the other has a fitting portion into which the boss fits.

3. The lighting fixture according to claim 1, further comprising clamping portions that sandwich a flat portion parallel to the mounting surface provided on the lens from both sides in the thickness direction of the lens.

4. The lighting fixture according to claim 3, characterized in that the clamping portion has a predetermined gap between it and the flat portion.

5. The lighting fixture according to claim 3, characterized in that the clamping portion is made by sandwiching the planar portion between the first support member and the second support member, which are separate entities.

6. The lighting fixture according to claim 1, characterized in that the reference position is the center of the lens or its vicinity.

7. Having multiple light sources, The lighting fixture according to claim 1, characterized in that the lenses are provided in a one-to-one ratio with the light source, and each of the lenses is independently supported by the first support member and the second support member.

8. The lighting fixture according to any one of claims 1 to 7, characterized in that the lens is a lens made of silicone material.

Images