lighting equipment

Abstract

This invention provides a lighting device. The lighting device has a light source assembly (1) comprising a funnel-shaped reflector (10) having a neck and an opening, and an LED (20) disposed on the neck. The opening of the funnel-shaped reflector (10) has a rectangular planar shape, and when the distance along the optical axis from the neck to the opening is d, and the length of one side of the rectangle is x, d / x is 2 or more. According to this invention, a rectangular light spot can be achieved with a simple structure.

Description

TECHNICAL FIELD

[0001] The present application relates to a lighting device, and particularly to a lighting device capable of obtaining an arbitrary light spot shape. BACKGROUND

[0002] It is difficult for a general lighting device of a circular orientation to uniformly irradiate each corner of a floor surface of a room or a table, etc. of a quadrangular shape with a shape of uneven illuminance.

[0003] In Patent Literature 1, it is described that a lighting device of a circular light exit surface and an umbrella shape has a structure of a quadrangular light spot obtained by simulating by making the shape of a reflection plate different at each place.

[0004] In Patent Literature 2, it is described that a lighting device of a circular light exit surface and a cylindrical shape has a structure of a quadrangular light spot obtained by simulating by changing the shape of a concave mirror at each place.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Laid-Open No. 2006-236814

[0008] Patent Literature 2: Japanese Patent Application Laid-Open No. 2008-159562 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] As a method of obtaining a simulated light spot from a lighting device of a circular plane, the structure of Patent Literature 1 is to arrange a plurality of reflection plates having different shapes inside a lighting device of an umbrella shape and to obtain a structure of a quadrangular light spot by changing the shape of the reflection plate, and since it is necessary to arrange a plurality of reflection plates considering the reflection characteristics inside the lighting device, the design and manufacture become complicated.

[0011] On the other hand, the structure of Patent Literature 2 is to arrange LEDs corresponding to a plurality of concave mirrors inside a lighting device and to obtain a structure of a quadrangular light spot by controlling the reflection characteristics of each concave mirror, and since it is necessary to consider the characteristics and arrangement positions of each concave mirror, the structure becomes complicated.

[0012] The present application is to obtain a quadrangular shape and an arbitrary shape of a light spot shape by a light source of a simpler configuration.

[0013] MEANS OF SOLVING THE PROBLEM

[0014] The present application is to solve the above problems, the main technical means as follows.

[0015] (1) A lighting device characterized by having a light source assembly composed of a funnel-shaped reflector plate having a neck portion and an opening portion, and an LED disposed at the neck portion, wherein the opening portion of the funnel-shaped reflector plate has a rectangular planar shape, and wherein, when a distance along an optical axis from the neck portion to the opening portion is denoted by d, and a length of one side of the rectangular planar shape is denoted by x, d / x is 2 or more.

[0016] (2) A lighting device characterized by having a plurality of light sources including a first light source and a second light source disposed at a prescribed distance apart, wherein the first light source has a first light source assembly, the second light source has a second light source assembly, and the first light source assembly and the second light source assembly each have a light source assembly composed of a funnel-shaped reflector plate having a neck portion and an opening portion, and an LED disposed at the neck portion, wherein the opening portion of the funnel-shaped reflector plate has a rectangular planar shape, and wherein, when a distance along an optical axis from the neck portion to the opening portion is denoted by d, and a length of one side of the rectangular planar shape is denoted by x, d / x is 2 or more.

[0017] (3) A lighting device characterized by having a structure in which a plurality of light source assemblies including a first light source assembly and a second light source assembly are disposed adjacent to each other, wherein the first light source assembly and the second light source assembly each have a light source assembly composed of a funnel-shaped reflector plate having a neck portion and an opening portion, and an LED disposed at the neck portion, wherein the opening portion of the funnel-shaped reflector plate has a rectangular planar shape, and wherein, when a distance along an optical axis from the neck portion to the opening portion is denoted by d, and a length of one side of the rectangular planar shape is denoted by x, d / x is 2 or more for either of the first light source assembly and the second light source assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a cross-sectional view showing a lighting state using a conventional lighting device.

[0019] Figure 2 is Figure 1 a bottom view of the lighting device of

[0020] Figure 3 is a plan view showing a light spot on the ground.

[0021] Figure 4 is a cross-sectional view showing a lighting state using a lighting device in which a lens is disposed.

[0022] Figure 5 is a perspective view of a light source assembly based on the present application.

[0023] Figure 6 is a side view of the light source assembly based on the present application.

[0024] Figure 7 is a bottom view of the light source assembly based on the present application.

[0025] Figure 8 is a cross-sectional view of the light source assembly based on the present application.

[0026] Figure 9 is a perspective view showing the relationship between the light source assembly and the light spot based on the present application.

[0027] Figure 10 is a cross-sectional view showing the structure of Example 1.

[0028] Figure 11 is a first example of the light spot shape of Example 1.

[0029] Figure 12 is a second example of the light spot shape of Example 1.

[0030] Figure 13 is a third example of the light spot shape of Example 1.

[0031] Figure 14 is a fourth example of the light spot shape of Example 1.

[0032] Figure 15 is a cross-sectional view showing Example 2.

[0033] Figure 16 is another cross-sectional view showing Example 2.

[0034] Figure 17 is a perspective view showing the structure of Example 2.

[0035] Figure 18 is an example of the light spot formed based on the light source assembly A.

[0036] Figure 19 is an example of the light spot formed based on the light source assembly B.

[0037] Figure 20 is an example of the light spot formed based on the light source assembly C.

[0038] Figure 21 is an example of the light spot formed based on the light source assembly D.

[0039] Figure 22 is an example of the light spot when all of the light source assemblies A to D are lit.

[0040] Figure 23 is an example of the light spot when the light source assemblies A and D are lit.

[0041] Figure 24 This is an example of the light spot when light source components B and C are lit.

[0042] Figure 25 This is a perspective view showing the structure of Example 3.

[0043] Figure 26 This is an example of a light spot formed based on the light source component E.

[0044] Figure 27 This is an example of a light spot formed based on the light source component F.

[0045] Figure 28 This is an example of a light spot when three light source components F are lit.

[0046] Explanation of reference numerals in the attached figures

[0047] 1…light source assembly, 10…funnel-shaped reflector, 20…LED, 30…beam, 40…light spot, 50…irradiation surface, ground, 60…irradiation area, 70…lens, 100…umbrella-shaped reflector, 200…light source assembly. Detailed Implementation

[0048] Figure 1 This is a cross-sectional view showing the beam 30 from a light source assembly 200, which is a conventional example and has an LED light source 20 and an umbrella-shaped reflector 100, and the light spot 40 on the ground 50.

[0049] Figure 2 Viewed from below Figure 1 The bottom view of the light source assembly 200. (See figure) Figure 2 As shown, the planar shape of the light-emitting part of the light source assembly 200 is circular.

[0050] exist Figure 1 In the process, the light beam 30 from the light source assembly 200 illuminates the light spot 40 on the irradiated surface, such as the ground 50. Figure 3 The shape of the illumination spot 40. For example... Figure 3 As shown, the shape of the illumination spot 40 is circular. For example, if the room is quadrilateral, the circular spot 40 cannot illuminate the four corners of the room, and the four corners of the room will become dark.

[0051] On the other hand, when it is desired to change the shape of the light spot 40, such as reducing its size, for example... Figure 4 Lens 70 is used as shown. Figure 4 This describes a scenario where a convex lens 70 is used at the emission surface of the light source assembly 200 to reduce the size of the light spot 40. Using a concave lens would increase the diameter of the light spot 40, but the shape of the light spot would remain circular. Changing the shape of the light spot 40 using a lens would require fabricating an aspherical lens, which necessitates complex calculations and manufacturing processes.

[0052] The present application aims at realizing a square light spot with a simple configuration of a light source assembly, and also realizing a light spot of an arbitrary shape with a simple configuration, not limited to a square. The present application will be described in detail through the following embodiments.

[0053] [Embodiment 1]

[0054] Figure 5 is a perspective view of a light source assembly 1 according to the present application. Figure 5 The light source assembly 1 is characterized by the fact that a light-emitting diode (hereinafter also referred to as LED) 20 as a light source is arranged at the neck portion, and a funnel-shaped reflection plate 10 having a planar quadrangle is used. The funnel-shaped reflection plate 10 has a mirror surface inside, and at least a part thereof has a parabolic surface, so that light from the LED 20 as a light source is directed in a direction parallel to the optical axis. In Figure 5 In the present embodiment, the optical axis is parallel to the z-axis direction.

[0055] The exit surface of the funnel-shaped reflection plate 10 is a quadrangle, and x11, y11 are, for example, 6.9 mm. In addition, the height dl of the funnel-shaped reflection plate 10 is, for example, 20 mm. The LED 20 is arranged at the neck portion of the funnel-shaped reflection plate 10, and the size of the LED 20 is, for example, a rectangle having a side of 2 mm or so. In this way, Figure 5 The light source assembly 1 shown in

[0056] In the case where the funnel-shaped reflection plate 10 is formed of metal, for example, sufficient strength can be ensured even if the thickness is about 0.2 mm. In the case of being formed of metal, it can be formed by extrusion molding, for example. The funnel-shaped reflection plate 10 can also be formed of resin. In this case, the resin is molded, and a metal such as aluminum having a high reflectance is vapor-deposited or sputtered on the inner wall to form a film, thereby forming a mirror surface.

[0057] Figure 6 is a side view of the light source assembly 1 shown in Figure 5 The height dl of the funnel-shaped reflection plate 10 is, for example, 20 mm, and the width x11 is, for example, 6.9 mm. Hereinafter, in the case where the dimensions of the funnel-shaped reflection plate 10 are mentioned, the dimensions of the inside are meant unless otherwise specified. Figure 7 is a bottom view of the light source assembly 1 shown in Figure 5 As shown in Figure 7 The opening of the light source assembly 1 is a quadrangle, and is designed in such a way that the light beam spot also remains a quadrangle. In Figure 7In the present embodiment, the opening of the funnel-shaped reflector plate 10 is square, and the inner diameters x1 and y1 are each 6.5 mm. The plate thickness of the funnel-shaped reflector plate 10 is 0.2 mm. Hereinafter, unless otherwise specified, the dimensions of the funnel-shaped reflector plate 10 refer to the dimensions on the inner side.

[0058] Figure 8 is a cross-sectional view of the light source assembly 1, and corresponds to the A-A cross-sectional view of Figure 6 . The light emitted from the LED 20 as the light source is reflected by the inner surface of the funnel-shaped reflector plate 10 whose at least one portion of the side surface is a parabola, and is emitted in a direction parallel to the optical axis, except for the light that travels straight in the direction of the optical axis. Thus, the emitted light from the light source assembly 1 shown in Figure 8 can form a small light distribution angle of 10 degrees or less.

[0059] The important point of the present application is that a relatively simple configuration in which the light source, i.e., the LED, is disposed at the neck portion of the funnel-shaped reflector plate 10 whose opening is quadrangular, can achieve a light spot that is quadrangular in shape. Figure 9 is a perspective view showing the same. In Figure 9 , the light spot shape 40 of the light emitted from the light source assembly 1 is quadrangular. In Figure 9 , the light spot is that of a portion close to the light source assembly 1. The light from the light source assembly 1 in the present application has a small light distribution angle of 10 degrees or less, and thus, for example, in an irradiation surface that is about 4 m from the opening of the light source assembly 1, the light spot shape 40 is maintained to be quadrangular.

[0060] In order to maintain such a light distribution angle, it is preferable that the relationship between the straight line x1 or y1 of the opening of the funnel-shaped reflector plate 10 shown in Figure 5 and the height d1 be d1 ≥ 2x1 and d1 ≥ 2y1, more preferably d1 ≥ 3x1 and d1 ≥ 3y1, and further preferably d1 ≥ 4x1 and d1 ≥ 4y1. The height d1, in other words, can be said to be the distance along the optical axis from the neck portion to the opening of the funnel-shaped reflector plate 10.

[0061] The relationship between x1 or y1 and the height d1 can also be referred to as the aspect ratio. The greater the aspect ratio, the greater the height of the lighting device. Since x1 and y1 are relatively small dimensions of about 6.5 mm, even if the aspect ratio is 3, for example, d1 is 20 mm or less, and even if the aspect ratio is 4, d1 is about 26 mm, and thus the thickness of the lighting device is in a range that is not problematic.

[0062] As shown in Figure 9 , if the light source assembly 1 based on the present application is used, the light spot shape 40 can be maintained to be quadrangular on the irradiation surface, and thus, by using a plurality of Figure 9The funnel-shaped reflector plate 10 shown is capable of obtaining an arbitrary spot shape 40. Figure 10 A schematic view for illustrating the example.

[0063] Figure 10 is an example in which two light source assemblies 1 are arranged at a prescribed distance w1 apart to synthesize two spots 40 to form a horizontally long rectangular spot. The prescribed distance w1 is determined in accordance with the distribution angle of light emitted from the light source assembly 1 and the distance from the light source assembly 1 to the irradiation surface. As shown in Figure 10 , the prescribed distance w1 between the light source assemblies coincides with the interval of the centers of the two spots 40.

[0064] In Figure 10 , the light source assembly 1 is a light source assembly 1 having a funnel-shaped reflector plate 10 as shown in Figure 9 . The cross section of the light beam 30 emitted from the light source assembly 1 is maintained as a quadrangle as shown in Figure 9 . Also, although the light beam 30 expands with a prescribed distribution angle, it is maintained as a quadrangle in the irradiation surface. Figure 10 In , a horizontally long rectangular spot is obtained by arranging two spots 40 side by side.

[0065] Figure 10 is an example in which two light source assemblies 1 are arranged at a prescribed distance apart, but the light source assemblies 1 are not limited to two and an arbitrary number can be arranged to obtain an arbitrary spot shape. Figure 11 is an example in which a horizontally long rectangular spot is obtained by arranging three light source assemblies 1 in the y direction and four light source assemblies 1 in the x direction at a prescribed distance apart. In this case, the light source assemblies 1 are arranged at a prescribed distance apart in the x direction and the y direction, and the prescribed distance in this case is determined in accordance with the distribution angle in the x direction and the distance in the z direction from the light source assembly to the irradiation surface, or the distribution angle in the y direction and the distance in the z direction from the light source assembly to the irradiation surface.

[0066] Figure 12 is an example in which the spot is formed in an L shape. Figure 13 is an example in which the spot is formed in a horizontally T shape. Such a special-shaped spot can also be easily realized by arranging the light source assembly 1 based on the present application at a prescribed distance apart in the x direction or the y direction.

[0067] The spot shape 40 of the light source assembly 1 based on the present application is not limited to a square. Figure 7 The opening of the funnel-shaped reflector plate 10 shown is not a square but is capable of forming a rectangular spot by being formed in a rectangular shape. In this case, the shape of the rectangular spot 40 formed on the irradiation surface is determined in accordance with the shape of the opening of the funnel-shaped reflector plate 10, the distribution angle in the x direction, and the distribution angle in the y direction.

[0068] Figure 14 is a case where a light spot 41 long in the y direction and a light spot formed by arranging three square light spots 40 in the y direction are synthesized to obtain a rectangular light spot. As such, by arbitrarily combining the oblong light spot 41 and the square light spot 40, an arbitrary light spot shape can be obtained.

[0069] However, in order to maintain the shape of the light spot 40 as a rectangle even on the irradiation surface, in addition to increasing the aspect ratio, it is preferable that at least a part of the shape of the cross section along the optical axis of the funnel-shaped reflection plate 10 be formed in a parabolic shape.

[0070] [Example 2]

[0071] In Example 1, a case where a rectangular light spot 40 is obtained on the irradiation surface by forming the opening of the funnel-shaped reflection plate 10 in a quadrilateral shape is described. In order to form such a structure, it is necessary to make the distribution angle of light emitted from the light source assembly 1 relatively small, 10 degrees or less. In Figure 5 In the case of the funnel-shaped reflection plate 10 shown in FIG. 8, in order to reduce the distribution angle, the ratio of the diameter x1 or y1 of the opening of the funnel-shaped reflection plate 10 to the height d1 (hereinafter also referred to as the depth d1) of the funnel-shaped reflection plate is 2 or more, more preferably 3 or more, and further preferably 4 or more.

[0072] As the ratio of the diameter (x1, y1, hereinafter represented by x1) of the opening portion of the funnel-shaped reflection plate 10 to the depth d1 becomes smaller, the deviation of the irradiation light spot 40 from a rectangle becomes larger, and the diameter of the light spot also becomes larger. Figure 15 is a cross-sectional view showing a state where two light source assemblies 1 having the same diameter of the opening portion and different depths of the funnel-shaped reflection plate 10 are arranged. The diameter of the opening portion of each funnel-shaped reflection plate 10 is about 6.5 mm, and the two funnel-shaped reflection plates 10 are arranged adjacent to each other.

[0073] In Figure 15 , in the irradiation surface 50 at a prescribed distance from the light source assembly 1, the light spot diameter 40 from the light source assembly 1 on the left side having a large depth (d1) is sw1, and the light spot diameter 40 from the light source assembly 1 on the right side having a small depth (d2) is sw2, and sw2 > sw1. Further, as the depth (d1, d2) of the light source assembly 1 becomes smaller, not only the light spot diameter 40 becomes larger, but also the light spot shape deviates from a rectangle.

[0074] In Figure 15 , because the two light source assemblies 1 are adjacent, the light beams 30 from the two light source assemblies 1 mix in the irradiation surface 50. Also, when the distance from the light source assembly 1 to the irradiation surface 50 becomes a certain value or more, the two beam light spots completely mix to become one light spot.

[0075] Figure 16 is a cross-sectional view illustrating a light source assembly 1, an irradiation surface 50, etc. more closely to actual dimensions. In Figure 16 , on the upper side, 2 light source assemblies 1 are arranged and disposed with a center-to-center distance w2 of, for example, 7 mm. The depth d of the light source assembly is, for example, 20 mm. The diameter of the light spot in the case where light is irradiated from the 2 light source assemblies 1 to the floor 50 which is apart by h (for example, 4 m) is sw3.

[0076] The light spot of the light projected onto the floor 50 is actually the light projected from the 2 light source assemblies 1, the center-to-center distance between the 2 light source assemblies is 7 mm, the distance h from the light source assembly 1 to the floor 50 is 4 m, and between the light source assembly 1 and the floor 50, the light from the 2 light source assemblies 1 is completely mixed to become a light spot from 1 light source.

[0077] In addition, because the distance w2 between the light source assemblies 1 is very small compared to the distance h from the light source assembly to the floor, even if any light source assembly 1 is used, the center position of the light spot 40 on the floor 50 hardly changes. In Figure 16 , it is an example in which 2 light source assemblies 1 are disposed, and it is almost the same in the case where 3 are disposed, in the case where 4 are disposed.

[0078] Figure 17 is a perspective view illustrating a lighting device in which 4 light source assemblies with different aspect ratios are disposed. In Figure 17 , 4 light source assemblies A, B, C, D whose opening portions are square are disposed in a square shape. The diameters of the opening portions of the light source assemblies A, B, C, D are the same, but the heights (depths) are different. The aspect ratio of the light source assembly A is the largest, and the aspect ratio of the light source assembly D is the smallest. Therefore, the shape of the light spot 40 formed by the light source assembly A maintains a rectangle, and the shape of the light spot 40 formed by the light source assembly D deviates the most from a rectangle. In addition, in Figure 17 , the rectangles corresponding to the light source assemblies A to D are a virtual space which indicates the region in which each light source assembly is disposed.

[0079] However, even if the 4 light source assemblies of Figure 17 are lit respectively, as explained in Figure 16 , the center of the light spot 40 irradiated to the floor hardly changes. Therefore, if a lighting device as shown in Figure 17 is used, by lighting any light source assembly, it is possible to change the shape of the light spot 40.

[0080] Figure 18 is the light spot shape in the case where only the light source assembly A in Figure 17 is lit. Figure 18This refers to the illumination of a portion of the ground surface (50) irradiated with a spot (40). The subsequent diagrams follow the same pattern. Figure 18 In the illumination area 60, the light spot 40 remains rectangular. That is, because the height-to-width ratio of the light source component A is large, the light beam maintains the shape of the opening of the light source component A, thus becoming rectangular.

[0081] Figure 18 The chart on the right shows the illuminance of the location corresponding to spot 40. Figure 18 The horizontal axis of the chart represents illuminance. Figure 18 The illuminance distribution rises sharply in the light spot area, indicating the formation of a clear rectangular light spot 40.

[0082] Figure 19 For only Figure 17 The shape of the light spot when light source component B is lit. Because the aspect ratio of light source component B is smaller than that of light source component A, the light spot in the illumination area 60 deviates from a rectangle and approaches a circle. Figure 19 The chart on the right shows the illuminance at the location corresponding to spot 40. Figure 19 In the chart, the illuminance in spot 40 and Figure 18 Compared to the previous situation, the increase was gradual, and the peak illuminance was also lower. Figure 18 Small.

[0083] Figure 20 It is only Figure 17 The shape of the light spot when the light source component C is lit. Because the aspect ratio of the light source component C is smaller than that of the light source component B, the light spot 40 in the illumination area 60 deviates further from a rectangle, approaches a circle, and has a larger diameter. Figure 20 The chart on the right shows the illuminance corresponding to spot size 40. Figure 20 In the chart, the illuminance in the light spot and Figure 19 The increase was more gradual compared to the previous situation, and the peak illuminance was also higher. Figure 19 It becomes smaller.

[0084] Figure 21 It is only Figure 17 The shape of the light spot when the light source component D is lit. Because the aspect ratio of the light source component D is further smaller than that of the light source component C, the light spot 40 in the illumination area 60 deviates more from a rectangle, approaches a circle, and its diameter also becomes larger. Figure 21 The chart on the right shows the illuminance in the location corresponding to spot 40. Figure 21 In the chart, the illuminance in spot 40 and Figure 20 The increase is more gradual compared to the situation in other cases, and the peak illuminance is similar to... Figure 20 It has also become smaller in comparison.

[0085] Like this, byFigure 17 Any one of the four light source assemblies A, B, C, and D in the lighting device of the present embodiment is lit, and a unique illuminance distribution for each light source assembly can be obtained.

[0086] Figure 17 In the lighting device of the present embodiment, by using the four light source assemblies in combination, different spot shapes can be further obtained. Figure 22 is an example of the spot 40 in the case where all of the four light source assemblies A, B, C, and D in the lighting device of the present embodiment are lit. In Figure 17 , the contour line indicated by a solid line is the range of the highest illuminance, and the contour line indicated by a dashed line is the range of the next highest illuminance. The other contour lines are omitted. In Figure 22 , the same applies. Figure 23 Figure 24

[0087] Figure 22 The graph on the right side is a graph indicating the illuminance distribution corresponding to the spot on the left side, and the horizontal axis indicates the illuminance. Figure 22 In the case of Figure 18 , the illuminance becomes larger than in the case of Figure 18 . On the other hand, the rising portion of the illuminance also becomes gentler than in the case of

[0088] Figure 23 is an example of the spot 40 in the case where only the light source assemblies A and D are lit in the lighting device of the present embodiment. The spot shape maintains a shape closer to a rectangle due to the influence of the light source assembly A. Figure 17 The graph on the right side is a graph indicating the illuminance distribution corresponding to the spot 40 on the left side, and the horizontal axis indicates the illuminance. In Figure 23 , because the shape of the illuminance distribution in Figure 23 is overlapped on the illuminance distribution in Figure 21 , the rising of the illuminance in the portion corresponding to the rectangular spot formed by the light source assembly A becomes sharp. Figure 18

[0089] Figure 24 is an example of the spot in the case where only the light source assemblies B and C are lit in the lighting device of the present embodiment. Because the spot shape formed by the light source assembly B and the spot shape formed by the light source assembly C are both deviated from a rectangle, the spot in Figure 17 also becomes a shape deviated from a rectangle. Figure 24

[0090] Figure 24 The graph on the right side is a graph indicating the illuminance distribution corresponding to the spot 40 on the left side, and the horizontal axis indicates the illuminance. In Figure 24 , because the shape is formed so as to overlap the illuminance distribution in Figure 19 on the illuminance distribution in Figure 20 ​​​​the shape of the illuminance distribution in the spot 40, so the rise of the illuminance in the spot 40 becomes gentle compared to Figure 22 , Figure 23 the shape of the illuminance distribution in the spot 40, so the rise of the illuminance in the spot 40 becomes gentle compared to

[0091] As such, according to Embodiment 2, using four different light source assemblies enables light spots of various shapes, and light spots having various illuminance distributions can be achieved.

[0092]

Embodiment 3

[0093] Embodiment 3 is an example of another combination of light source assemblies. Figure 25 is a perspective view of a lighting device in which four light source assemblies having different aspect ratios are arranged. Figure 25 The difference from Figure 17 is that, Figure 25 in which a light source assembly E having a large aspect ratio and three light source assemblies F having small aspect ratios are used. Further, in Figure 25 corresponding to the light source assembly E and the three light source assemblies F represent regions in which the respective light source assemblies are arranged.

[0094] Figure 26 is a spot shape in a case in which only the light source assembly E in Figure 25 is lit. Because the light source assembly E has a large aspect ratio, the spot shape in Figure 26 is almost the same as the spot shape in Figure 18 . The graph on the right side of Figure 26 is the illuminance in a place corresponding to the spot 40. The illuminance distribution in Figure 26 also becomes a shape close to the illuminance distribution in Figure 18 .

[0095] Figure 27 is a spot shape in a case in which only one of the light source assemblies F in Figure 25 is lit. The aspect ratio of the light source assembly F is smaller than the aspect ratio of the light source assembly E. The spot shape in Figure 27 is almost the same as the spot shape in Figure 20 . Further, the spot shape in Figure 27 is recorded with a broken line, the spot shape in Figure 27 is recorded with a solid line. This is to indicate that the light from the light source assembly F diverges more than the light from the light source assembly E, and the isopleths of the illuminance become unclear. The graph on the right side of Figure 27 is the illuminance in a place corresponding to the spot 40. The illuminance distribution in Figure 20 also becomes a shape close to the illuminance distribution in Figure 28 .

[0096] Figure 25 is a spot shape in a case in which all of the three light source assemblies F in Figure 28 are lit. In this case, the light source assemblies F are arranged in a line.Figure 28 The inner solid line in the spot shape is a region of larger illuminance, and the outer dotted line is a region of smaller illuminance. Because Figure 27 the illuminance becomes about 3 times the illuminance of Figure 28 , the isoclines of the illuminance in the spot 40 also differ.

[0097] Figure 28 The graph on the right side of Figure 27 is the illuminance in the place corresponding to the spot 40. Figure 27 the illuminance becomes about 3 times the illuminance of Figure 28 , corresponding to this, there is also a portion where the change in illuminance becomes sharp, as in the case of

[0098] Comparing Figure 26 with Figure 28 , the illuminance near the center of the spot 40 is almost the same. However, the spot shape differs greatly in Figure 26 and Figure 10 . As such, in Embodiment 3, it is possible to make the illuminance at the center of the spot 40 the same, but greatly change the shape of the spot 40.

[0099] As explained above, according to the present application, by making the opening of the funnel-shaped reflector plate 10 of the light source assembly 1 rectangular, it is possible to obtain a rectangular spot 40. In addition, by changing the aspect ratio of the funnel-shaped reflector plate 10, it is possible to obtain spots of various shapes. In addition, by using light source assemblies 1 with different aspect ratios in combination, it is possible to form spots of various shapes and with various illuminance distributions.

[0100] Further, in Embodiments 2 and 3, the aspect ratios of the adjacent multiple light source assemblies differ, but it is also possible for the aspect ratios of the adjacent multiple light source assemblies to be the same. That is, it is possible to increase the illuminance with the same spot shape. For example, in ​ , the light source assembly 1 corresponding to each spot is one, but by adjacently arranging multiple light source assemblies 1 with larger aspect ratios corresponding to each spot, it is possible to obtain a rectangular spot with larger illuminance.

[0101] In addition, because each light source assembly in the present application is very small, even if the aspect ratio is increased, the lighting device will not become very thick. In addition, in the case where it is desired to increase the illuminance of the spot, multiple light source assemblies can be provided together.

Claims

1. An illumination device having a structure in which a plurality of light source assemblies including a first light source assembly and a second light source assembly are adjacently arranged, characterized in that: the first light source assembly and the second light source assembly each have a light source assembly composed of a funnel-shaped reflector having a neck portion and an opening portion, and an LED arranged at the neck portion, the opening portion of the funnel-shaped reflector has a planar shape of a rectangle, when a distance along an optical axis from the neck portion to the opening portion is d and a length of one side of the rectangle is x, d / x of either of the first light source assembly and the second light source assembly is 2 or more, the distance along the optical axis from the neck portion to the opening portion of the first light source assembly is greater than the distance along the optical axis from the neck portion to the opening portion of the second light source assembly.

2. The illumination device according to claim 1, characterized in that: d / x of either of the first light source assembly and the second light source assembly is 3 or more.

3. The illumination device according to claim 1, characterized in that: d / x of the first light source assembly and d / x of the second light source assembly are different from each other.

4. The illumination device according to claim 1, characterized in that: the plurality of light source assemblies are four or more. ​ ​ ​ ​ ​ ​ ​ ​

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