Lighting device

Abstract

A lighting device that irradiates a surface to be irradiated with light is provided with: a light source; and a lens having an incident surface for receiving the light emitted from the light source, and an emission surface for emitting the light received by the incident surface. The ejection surface is a convex curved surface. The curvature of the exit surface in a first direction perpendicular to the optical axis direction of the lens is smaller than the curvature of the exit surface in a second direction perpendicular to the optical axis direction and the first direction.

Description

Technical Field

[0001] The present disclosure relates to lighting devices. Background Art

[0002] Conventionally, there is known a lighting device called a row light that is used for lighting performances and is used to illuminate a background wall surface of a studio, a stage, or the like of a television station.

[0003] For example, the lighting device of Patent Document 1 includes a first light source and a second light source. The light from the second light source is irradiated to the upper side of the background wall surface, and the light distribution characteristic is flat. A plurality of prisms are arranged on the reflecting surface of the light guide plate. In addition, the light from the first light source is irradiated to a position lower than the light from the second light source in the background wall surface (illuminated surface), and forms a region with a light distribution characteristic having a higher illumination than the surrounding area (so-called light retention). As a result, the lighting device of Patent Document 1 has an extended light distribution characteristic in which light retention is formed below the background wall surface and the illumination gradually decreases toward the upper side of the background wall surface.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2014-127380 Summary of the invention

[0007] However, in recent years, there has been an increasing demand for improving the color rendering of lighting devices. In addition, there is a demand for a high-quality lighting device that can not only ensure a wide space such as a stage, but also withstand performances in narrow spaces such as indoor corridors or in small spaces such as trains, cars, and airplanes. Therefore, there is a need for a lighting device that can be miniaturized and can be arranged near the illuminated surface.

[0008] Therefore, an object of the present disclosure is to provide a lighting device that can be miniaturized and that can maintain lighting quality even when the lighting device is disposed near a surface to be illuminated.

[0009] In order to achieve the above-mentioned purpose, an illumination device according to one embodiment of the present disclosure irradiates light to an irradiated surface, and the illumination device comprises: a light source; and a lens, comprising an incident surface for receiving light irradiated from the light source, and an exit surface for emitting light received at the incident surface. The exit surface is a convex curved surface. The curvature of the exit surface in a first direction perpendicular to the optical axis direction of the lens is smaller than the curvature of the exit surface in a second direction perpendicular to the optical axis direction and the first direction.

[0010] According to the present disclosure, the lighting device can be miniaturized, and the lighting quality can be maintained even if the lighting device is arranged near a surface to be illuminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the lighting device involved in the first embodiment.

[0012] Figure 2 It is a structural diagram of a lens according to the first embodiment.

[0013] Figure 3 It is a diagram showing an arrangement example of the lighting device according to the first embodiment.

[0014] Figure 4A It is a diagram for explaining the lighting device according to the second embodiment.

[0015] Figure 4B It is a diagram for explaining the lighting device according to the second embodiment.

[0016] Figure 5A It is a diagram for explaining the lighting device involved in the third embodiment.

[0017] Figure 5B It is a diagram for explaining the lighting device involved in the third embodiment.

[0018] Figure 6 It is a diagram for explaining the lighting device involved in the fourth embodiment.

[0019] Figure 7 It is a diagram for explaining the lighting device involved in the fifth embodiment.

[0020] Figure 8 It is a diagram for explaining the lighting device involved in the sixth embodiment.

[0021] Fig. 9 It is a structural diagram of a lighting device involved in the seventh embodiment.

[0022] Fig.10 It is a structural diagram of a lighting device involved in the eighth embodiment. DETAILED DESCRIPTION

[0023] Below, embodiments of the present invention are described in detail based on the accompanying drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the present invention, its application or its use. In addition, in the following description, the same symbols are given to the same parts, and detailed description is appropriately omitted.

[0024] (First embodiment)

[0025] (Structure of lighting device)

[0026] Figure 1 is a structural diagram of a lighting device according to a first embodiment. Figure 2 is a structural diagram of a lens according to the first embodiment. Specifically, Figure 1 (a) is a front view of the lighting device 1, Figure 1 (b) is a top view of the lighting device 1, Figure 1 (c) is a side cross-sectional view of the lighting device 1 . Figure 2 (a) is a stereoscopic view of the lens 11 when viewed from above. Figure 2 (b) is a stereoscopic view of the lens 11 when viewed from below. Figure 2 (c) is a front view of the lens 11, Figure 2 (d) is a front cross-sectional view of the central part of the side surface of the lens 11. Figure 2 (e) is a side view of the lens 11, Figure 2 (f) is a side cross-sectional view of the central portion of the front face of the lens 11. Figure 1 In the description, the optical axis direction of the lens 11 is set to the z direction (equivalent to the optical axis direction), the extending direction of the lens connecting portion 12 (the direction in which the lenses 11 are arranged) is set to the y direction (equivalent to the first direction), and the direction perpendicular to the y direction and the z direction is set to the x direction (equivalent to the second direction). Figure 1 In the figures, the light emitted from the LED light source 20 is indicated by a dotted line.

[0027] like Figure 1 as well as Figure 2 As shown, the lighting device 1 includes a lens unit 10, an LED light source 20, and a housing 30. The housing 30 accommodates the LED light source 20 inside, and the lens unit 10 is disposed in an opening.

[0028] The lens unit 10 includes a plurality of lenses 11 and a pair of lens connecting portions 12 .

[0029] The lens 11 is a lens formed in a substantially semi-cylindrical shape and is formed of a transparent optical member such as optical glass or an optical resin material. The plurality of lenses 11 are arranged in the y direction and connected to each other by a pair of lens connecting portions 12 facing each other in the x direction. In addition, a slit 13 is formed between adjacent lenses 11. In addition, the lens portion 10 is manufactured by injection molding or the like. In addition, the lens connecting portion 12 is formed of a member such as a resin.

[0030] The lens 11 has an incident surface 111 and an emitting surface 112 . The lens 11 receives light from the LED light source 20 at the incident surface 111 , and irradiates the light from the emitting surface 112 .

[0031] The incident surface 111 is a concave curved surface having a convex portion 111a at the center on the xy plane (see Figure 2 (c) to (f)). That is, the central portion of the incident surface 111 is a convex portion, and the peripheral portion thereof is a concave portion, so that the illuminance of the central portion in the light distribution can be reduced while the illuminance change of the peripheral portion is smooth. Therefore, the light distribution of the lens 11 becomes gradually darker from the central portion to the peripheral end.

[0032] The emission surface 112 is a curved surface that is steeply convex in the x direction and gently convex in the y direction (see Figure 2 (c) to (f)). That is, the curvature of the convex shape of the emitting surface 112 in the y direction is smaller than the curvature of the convex shape in the x direction. Due to the shape of the emitting surface 112, the light emitted from the lens 11 becomes parallel light in the x direction and diffuse light in the y direction.

[0033] The LED light source 20 is a light source composed of a light emitting diode (LED: Light Emitting Diode) element and the like. The LED light source 20 is mounted on an LED substrate 21, and emits light at a wavelength and intensity corresponding to the characteristics of the LED light source 20 by applying current. Here, the LED light source 20 can output light set to any color. In addition, the LED light source 20 can use a single color light source or a plurality of colors of light sources. In addition, as Figure 1 As shown in FIG. 1 and FIG. 2 , the LED light source 20 radiates diffuse light having a fixed range in the x direction and the y direction.

[0034] like Figure 1 As shown in (a) and (b) of FIG. 1 , a plurality of LED light sources 20 are arranged on an LED substrate 21 . In the present embodiment, one LED light source 20 is arranged corresponding to one lens 11 .

[0035] Here, the lenses 11 are arranged at a given distance in the y direction. Therefore, slits 13 are formed between adjacent lenses 11 in the y direction. By forming slits 13 between lenses 11, only light irradiated from the LED light source 20 corresponding to the lens 11 enters, and light irradiated from the LED light source 20 corresponding to other lenses 11 is suppressed.

[0036] In addition, a shading plate 22 is provided for the slit 13. The shading plate 22 is formed of a black resin or metal material, and is preferably formed of a pad-shaped material with a high diffusion degree that is difficult to produce regular reflection on the surface. The shading plate 22 can suppress the light irradiated from the LED light source 20 corresponding to the other lens 11 from entering the lens 11.

[0037] In addition, an absorption layer 23 is formed on the side surface 113 in the y direction of the lens 11. The absorption layer 23 is black and sheet-shaped, and has an adhesive surface having a refractive index close to that of the lens 11. The absorption layer 23 can suppress interface reflection generated on the side surface 113 of the lens 11.

[0038] In addition, a stray light cover 24 is arranged on the incident surface 111 of the lens 11 so as to cover the outer periphery in the x direction. The stray light cover 24 is formed of a black resin or metal material, and is preferably formed of a pad-shaped material with a high degree of diffusion that makes it difficult to produce regular reflection on the surface. The LED light source 20 irradiates diffused light that extends radially in a circular shape when viewed from above. In contrast, the emission surface 112 of the lens 11 is square when viewed from above. Therefore, there is a concern that stray light will be generated at the corners of the emission surface 112 of the lens 11. Therefore, by covering the corners (four corners) of the emission surface 112 with the stray light cover 24, the generation of stray light can be suppressed. In addition, it is also believed that by setting the shape of the lens 11 when viewed from above (specifically, the shape of the emission surface 112 of the lens 11, etc.) to be circular, the generation of stray light can be suppressed without using the stray light cover 24. In this case, since the connection area between the lens connection part 12 and the lens 11 is reduced, a local large shape change occurs in the connection portion between the lens connection part 12 and the lens 11, and the rigidity of the lens unit 10 is reduced. Therefore, it is preferable to use the stray light cover 24.

[0039] (Regarding the configuration of lighting devices)

[0040] Figure 3 1 is a diagram showing an example of the configuration of the lighting device according to the first embodiment. Figure 3 (a) is a side view showing the light distribution of the lighting device, Figure 3 (b) is a front view showing the light distribution of the lighting device 1. In the following description, the same as Figure 1 as well as Figure 2 Specifically, the Y direction is consistent with the y direction, the Z direction is the up and down direction, and the Y direction is a direction perpendicular to the X direction and the Z direction.

[0041] like Figure 3 As shown in (a) and (b) of FIG. 1 , the lighting device 1 is arranged above the illuminated surface 42 (floor surface 41 ) and irradiates light to the illuminated surface 42 (wall surface). Specifically, the lighting device 1 is arranged so that the irradiation direction of light is inclined with respect to the vertical direction.

[0042] As described above, the emission surface 112 of the lens 11 is a curved surface that is a steep convex shape in the x direction and a gentle convex shape in the y direction. That is, the lighting device 1 irradiates parallel light in the x direction and irradiates diffuse light in the y direction. Therefore, the lighting device 1 can achieve a light distribution that is relatively wide in the x direction and the y direction relative to the irradiated surface 42. Therefore, by using the lens 11 having the emission surface 112 involved in this embodiment, the lighting device 1 can be miniaturized, and the lighting quality can be guaranteed even if the lighting device 1 is arranged near the irradiated surface 42.

[0043] The incident surface 111 of the lens 11 is a concave curved surface having a convex portion 111a in the center on the xy plane. That is, the light distribution S1 of the lighting device 1 is such that the illuminance in the center is reduced and the illuminance change in the peripheral portion is smooth (see Figure 3 (b)). Therefore, the light distribution S1 of the lighting device 1 gradually darkens from the center to the outer peripheral end. It is possible to suppress the outer peripheral end of the light distribution of the lighting device 1 from suddenly darkening.

[0044] In conventional lighting devices, light distribution control is performed by using a reflector or the like. Therefore, the light distribution ends become darker rapidly, and the lighting quality cannot be guaranteed when the lighting device is arranged in a narrow space. In addition, even if a lens (e.g., a cylindrical lens) is used instead of a reflector, the light distribution distribution ends become darker rapidly, and thus the lighting quality cannot be guaranteed. In contrast, by using a lens 11 having an emission surface 112 according to the present embodiment, the light distribution S1 of the lighting device 1 gradually becomes darker from the center to the peripheral ends, and thus the peripheral ends of the light distribution of the lighting device 1 can be suppressed from becoming darker rapidly. Therefore, the lighting device can be miniaturized, and the lighting quality can be guaranteed even if the lighting device is arranged near the irradiated surface.

[0045] (Second embodiment)

[0046] FIG4 is a diagram for explaining a lighting device according to a second embodiment. Specifically, Figure 4A (a) is a side cross-sectional view of the lighting devices 1a and 1b. Figure 4A (b) is a front view showing the light distribution of the lighting device 1a. Figure 4A (c) is a front view showing the light distribution of the lighting device 1b. Figure 4A (d) is a front view showing the light distribution of the lighting devices 1a and 1b. Figure 4B (e) shows an illuminance distribution diagram at the Z1 - Z1 cross section of (d) in Fig. 4. The lighting devices 1a and 1b have the same structure as the lighting device 1 and include LED light sources 20 of the same color.

[0047] like Figure 4A As shown in (a), in the second embodiment, two lighting devices 1 (1a, 1b) are arranged in parallel along the x direction. The lighting devices 1a and 1b are respectively provided with LED light sources 20 that irradiate light in the optical axis direction of the lens 11 at given angles θ1 and θ2. Due to the arrangement of the LED light sources 20, the lighting devices 1a and 1b have a light distribution S2 that irradiates the upper part of the irradiated surface 42 and a light distribution S3 that irradiates the lower part of the irradiated surface 42 (see Figure 4A Therefore, in the case of Figure 4A When the lighting devices 1a and 1b are arranged in the x direction as in (a), the lower end of the light distribution S2 of the lighting device 1a overlaps with the upper end of the light distribution S3 of the lighting device 1b, so the light distributions of the lighting devices 1a and 1b become Figure 4A The light distribution S4 is shown in (d). Figure 4B As shown in (e), the illuminance non-uniformity of the light distribution S4 (overall light distribution) of the lighting devices 1 a and 1 b disappears, and homogeneous lighting can be achieved.

[0048] Furthermore, when the LED light sources 20 of different colors are arranged in the lighting devices 1a and 1b, the light distribution of the lighting devices 1a and 1b becomes Figure 4B The light distribution S5 is as shown in (f). As described above, since the lower end of the light distribution S2 of the lighting device 1a and the upper end of the light distribution S3 of the lighting device 1b overlap, the light distribution S5 of the lighting devices 1a and 1b becomes a gradient with a gradual change in color from the top to the bottom. For example, in a case where the lighting device 1a has a red LED light source 20 and the lighting device 1b has a blue LED light source 20, the light distribution S5 of the lighting devices 1a and 1b becomes a gradient with a gradual change in color from red to magenta and from magenta to blue from the top to the bottom. That is, by configuring the lighting devices 1a and 1b with LED light sources 20 of different colors, a gradient expression can be achieved.

[0049] In addition, in the present embodiment, although the case where two lighting devices 1 ( 1 a , 1 b ) are arranged is described as an example, three or more lighting devices 1 may be arranged.

[0050] In this embodiment, the plurality of lighting devices 1 ( 1 a , 1 b ) are arranged in the x direction, but the arrangement of the lighting devices 1 is not limited thereto. The same effect can be obtained as long as the light distributions of the plurality of lighting devices 1 overlap each other at least in the vertical direction.

[0051] (Third embodiment)

[0052] FIG5 is a diagram for explaining a lighting device according to a third embodiment. Specifically, Figure 5A (a) is a front view showing the light distribution of the lighting devices 1c to 1g. Figure 5A (b) is Figure 5A (a) Illuminance distribution diagram at the Y1-Y1 section, Figure 5B It is an XY chromaticity diagram. In addition, the lighting devices 1c to 1g have the same structure as the lighting device 1.

[0053] like Figure 5A As shown in (a) of FIG. 3 , in the third embodiment, lighting devices 1c to 1g are arranged side by side in the Y direction at predetermined intervals above the illuminated surface 42. LED light sources 20 of different colors are arranged in the lighting devices 1c to 1g.

[0054] like Figure 5A As shown in (b), the light distribution S6 (overall light distribution) of the lighting devices 1c to 1g has a uniform illuminance in the center and gradually decreases in illuminance at both ends toward the outside. This is because the light distributions at the ends of the adjacent lighting devices 1 (1c to 1g) in the Y direction overlap each other, so that the uneven illuminance of the light distribution S6 of the lighting devices 1c to 1g disappears.

[0055] Here, refer to Figure 5B The method of setting the color of each LED light source 20 arranged in the lighting devices 1c to 1g is described. The XY chromaticity diagram is a color system for expressing colors, and each color is expressed as a color mixing ratio by the distribution of chromaticity X and chromaticity Y. Therefore, by appropriately combining chromaticity X and Y, any color can be expressed. Based on this XY chromaticity diagram, the color of the LED light source 20 of the lighting devices 1c to 1g is set.

[0056] For example, when the light distribution S6 of the lighting devices 1c to 1g is set to gradually change from green to red, the color of the LED light source 20 of the lighting device 1c is set to green (light source color A1, XY chromaticity coordinates (0.1, 0.8)), and the color of the LED light source 20 of the lighting device 1g is set to red (light source color A2, XY chromaticity coordinates (0.6, 0.3)). In addition, the colors of the LED light sources 20 of the lighting devices 1d to 1f are determined based on the XY chromaticity diagram according to the installation interval of the lighting devices 1c to 1g. For example, when the lighting device 1e is arranged at a middle point between the lighting devices 1c and 1g, the color of the LED light source 20 of the lighting device 1e is set to yellow (light source color A3, XY chromaticity coordinates (0.35, 0.55)), which is the color of the middle point between the light source colors A1 and A2. In this way, by determining the color of the LED light source of each lighting device based on the arrangement of the lighting device and the XY chromaticity diagram, a vivid gradation expression can be performed by the lighting device.

[0057] In addition, in the present embodiment, the colors of the LED light sources of the lighting devices 1c to 1g are different, but the colors of the LED light sources of the lighting devices 1c to 1g may be the same. In this case, the light distribution S6 of the lighting devices 1c to 1g becomes uniform in illumination in the center and the illumination at the left and right ends gradually decreases toward the outside, so that the illumination unevenness of the light distribution S6 of the lighting devices 1c to 1g disappears, and homogeneous lighting can be achieved.

[0058] In addition, in the present embodiment, the case where five lighting devices 1 ( 1 c to 1 g ) are arranged is described as an example, but 2 to 4 lighting devices 1 or 6 or more lighting devices 1 may be arranged.

[0059] In this embodiment, the plurality of lighting devices 1 ( 1 a , 1 b ) are arranged in the Y direction, but the arrangement of the lighting devices 1 is not limited thereto. The same effect can be obtained as long as the light distributions of the plurality of lighting devices 1 overlap at least in the Y direction.

[0060] (Fourth embodiment)

[0061] Figure 6 4 is a diagram for explaining a lighting device according to a fourth embodiment. Figure 6 (a) is a side view of the lens 11 a . Figure 6 (b) is Figure 6 The cross section is taken along the line C1 - C1 in (a), and is a cross section of a portion of the lens 11 a where light is irradiated onto the upper portion of the irradiated surface 42 . Figure 6 The emission surface 112 in (b) is an example of a first end portion of the emission surface 112 in the x-direction. Figure 6 (c) is Figure 6 The cross section is taken along the line C2 - C2 in (a), and is a cross section of a portion of the lens 11 a where light is irradiated to the upper and lower center portions of the irradiated surface 42 . Figure 6 (d) is Figure 6 The cross section is taken along the line C3 - C3 in (a), and is a cross section of a portion of the lens 11 a where light is irradiated to the lower portion of the irradiated surface 42 . Figure 6 The emission surface 112 in (d) is an example of the second end portion of the emission surface 112 in the x-direction. Figure 6 (e) is a diagram showing the light distribution of the lighting device 1 equipped with the lens 11a. Figure 6 In (e), a lens 11a is provided in the lighting device 1 instead of the lens 11. The lens 11a is made of the same member as the lens 11. Figure 6 In (b) and (d), the dashed line indicates the Figure 6 (c) Light emitted from lens 11a.

[0062] like Figure 6 As shown in (a) to (d) of FIG. 1 , the lens 11a has an emission surface 112 that is asymmetric in the x direction. Specifically, in the lens 11a, the curvature of the emission surface 112 for irradiating the upper portion of the irradiated surface 42 is relatively low (see FIG. 1 ). Figure 6 (b)), the curvature of the emitting surface 112 for irradiating the lower part of the irradiated surface 42 is higher (refer to Figure 6 (d)). That is, Figure 6 As shown, Figure 6 The exit surface 112 in (b) has a negative curvature in the y direction. Figure 6 The emission surface 112 in (d) has a positive curvature in the y direction. Therefore, the light emitted from the emission surface 112 corresponding to the upper portion of the irradiated surface 42 spreads more widely in the Y direction (y direction) than the light emitted from the emission surface 112 corresponding to the lower portion of the irradiated surface 42.

[0063] In addition, in the above description, the relationship between the curvatures of the first end and the second end in the x direction is described, but the relationship between the curvatures of the third end and the fourth end (not shown) of the emitting surface 112 in the y direction may be the same. Furthermore, the emitting surface 112 may also have the first end and the second end in the x direction, and the third end and the fourth end in the y direction, and the curvatures of the first end to the fourth end satisfy the above relationship. Thus, as described above, light can be widely diffused.

[0064] also, Figure 6 The curvature of the emission surface 112 in (b) does not necessarily have to be a negative curvature. Figure 6 The curvature of the emission surface 112 in (d) does not necessarily have to be a positive curvature. Figure 6 The curvature of the emission surface 112 in (b) and Figure 6 The curvatures of the emission surfaces 112 in (d) may be different from each other. That is, Figure 6 The curvature of the emission surface 112 in (b) and Figure 6 The curvature of the emitting surface 112 in (d) may be both positive or both negative. Figure 6 The curvature of the emission surface 112 in (b) and Figure 6 The curvature of the emitting surface 112 in (d) is different, including Figure 6 The absolute value of the curvature of the emission surface 112 in (b) and Figure 6 The absolute values ​​of the curvatures of the emission surface 112 in (d) are equal, but the polarities of the curvatures are different. The above structure can also achieve the effect of widely diffusing light. The same is true for the curvatures of the third end and the fourth end.

[0065] Figure 1The light distribution of the lighting device 1 in each of Fig. 5 is a substantially trapezoidal shape with a narrow upper portion and a wide lower portion. This is because the light emitted from the lighting device 1 spreads in the X direction and the Y direction as it moves away from the lighting device 1.

[0066] In contrast, Figure 6 The lighting device 1 is provided with a lens 11a, and thus has a substantially rectangular light distribution S7 (see Figure 6 (e)). As a result, since a symmetrical light distribution is achieved in the vertical direction, a natural light distribution is achieved, and a performance without a sense of incongruity can be performed. In addition, by making the lighting uniform, uneven illumination and uneven color can be made less noticeable.

[0067] (Fifth embodiment)

[0068] Figure 7 1 is a diagram for explaining a lighting device according to a fifth embodiment. Figure 7 (a) is a side sectional view of the lighting device 1, Figure 7 (b) is Figure 7 (a) An enlarged view of the region P of the lens 11b, Figure 7 (c) is a diagram showing the light distribution of the lighting device 1 provided with the lens 11 b , Figure 7 (d) shows the illumination distribution diagram at the section Z2-Z2. Figure 7 In (c), a lens 11 b is provided in the lighting device 1 instead of the lens 11 . The lens 11 b is made of the same member as the lens 11 .

[0069] like Figure 7 As shown in (a) and (b) of FIG. 1 , the lens 11b has a cut line portion 114 formed on the left side of the emitting surface 112 in the figure. The cut line portion 114 is provided to reduce the curvature of the left end portion of the emitting surface 112 in the figure (the region that irradiates light to the lower part of the irradiated surface 42). That is, the left end portion of the emitting surface 112 in the figure becomes almost a plane. Therefore, the lighting device 1 becomes a light distribution S8 (see FIG. 1 ) in which the illuminance at the lower end of the irradiated surface 42 is sharply reduced. Figure 7 (c), (d)).

[0070] When the lighting device 1 is disposed above the illuminated surface 42 and has a light distribution that is wide in the Z direction (z direction), the light distribution S8 of the lighting device 1 may not converge on the illuminated surface 42 but reach the floor surface 41. In this case, there is a concern that the light emitted from the lighting device 1 is reflected on the floor surface 41 and stray light is generated.

[0071] In contrast, in the lighting device according to the fifth embodiment, the use of the lens 11b provides a light distribution in which the illuminance sharply decreases at the lower end of the illuminated surface 42. This can prevent the light emitted from the lighting device 1 from being irradiated onto the floor surface 41.

[0072] (Sixth embodiment)

[0073] Figure 8 6 is a diagram for explaining a lighting device according to a sixth embodiment. Figure 8 (a) is a front view of the lighting device 1, Figure 8 (b) is an exploded front view of the lighting device 1. Figure 8 The lighting device 1 and Figure 1 In contrast, the lighting device 1 is provided with a lens 11c instead of the lens 11. Figure 8 In the lighting device 1 , a plurality of light shielding plates 22 are connected by a holder portion 25 .

[0074] like Figure 8 As shown in (a) and (b), the lens 11c has conical surfaces 113a inclined with respect to the z direction on both side surfaces in the y direction. In addition, for the shading plate 22, conical surfaces 22a inclined with respect to the z direction are formed on both side surfaces in the y direction. The conical surfaces 113a and 22a are inclined at the same angle with respect to the z direction. Therefore, when the shading plate 22 is inserted into the corresponding slit 13, it becomes a structure that is closely attached by an adhesive or the like so that an air layer cannot be formed.

[0075] As described above, the plurality of shading plates 22 are connected to the holder portion 25. That is, the plurality of shading plates 22 are integrated by the holder portion 25. Therefore, by arranging the shading plates 22 and the holder portion 25 in the housing 30, the lens portion 10 and the LED light source 20 can be positioned, thereby improving the arrangement accuracy of the lens portion 10 and the LED light source 20. In addition, since the work of arranging each shading plate 22 in the corresponding slit 13 is omitted, the assemblability of the lighting device is improved.

[0076] (Seventh Implementation Method)

[0077] Fig. 9 : is a structural diagram of a lighting device according to the seventh embodiment. Specifically, Fig. 9 (a) is a top view of the lighting device 1, Fig. 9 (b) is a front view of the lighting device 1, Fig. 9 (c) is a side view of the lighting device 1. Fig. 9 As shown, the lighting device 1 includes a moving mechanism 26 (first moving mechanism).

[0078] like Fig. 9As shown in (a) to (c) of FIG. 1 , the lighting device 1 includes a moving mechanism 26. The moving mechanism 26 is composed of a screw or the like, and the position of the LED light source 20 in the x direction can be changed by tightening or loosening the screw. That is, by operating the moving mechanism 26, the irradiation direction of the light of the LED light source 20 can be shifted, so that the emission direction of the light of the lighting device 1 can be changed. For example, when the irradiated surface 42 of the lighting device 1 is a flat surface, it is not necessary to change the emission direction of the lighting device 1, but when the irradiated surface 42 is a curved surface, it is necessary to change the emission direction of the lighting device 1 according to the curvature of the irradiated surface 42. When the lighting device 1 is produced on the basis of adjusting the position of the LED light source according to the curvature of the irradiated surface 42, it will cost money and it will be difficult to miniaturize. In contrast, in the lighting device 1, the emission direction of the lighting device 1 can be changed by operating the moving mechanism 26, so such a problem does not occur.

[0079] In addition, if Fig. 9 As shown in (c), a movable stray light cover 24a is arranged at the left and right ends of the emission surface 112 of the lens 11. The movable stray light cover 24 can shield the useless light generated when the position of the LED light source 20 is shifted. In addition, the moving mechanism 26 and the movable stray light cover 24a can also be a mechanism that moves in a linked manner. In this case, the movement amount of the moving mechanism 26 is predetermined according to the offset amount of the optical axis of the LED light source 20, thereby making it easy to set up the lighting device.

[0080] In addition, in this embodiment, the moving mechanism 26 is composed of screws ( Fig. 9 The moving mechanism 26 is composed of a hexagonal bolt (in the figure), but it is not limited to this, and any mechanism can be used as long as the position of the LED light source 20 is moved. For example, by using an enamel set (position screw) in the moving mechanism 26, the lighting device 1 can be miniaturized.

[0081] (Eighth Implementation Method)

[0082] Fig.10 (a) is a side view of a lighting device according to an eighth embodiment.

[0083] like Fig.10 As shown in (a) of FIG. 1 , the lighting device 1 is provided with a plurality of (here, two) LED light sources 20 a and 20 b for one lens 11 . Fig.10In (a), the LED light sources 20a and 20b irradiate light to different areas of the illuminated surface 42. In this case, by overlapping a portion of the light distribution of the LED light sources 20a and 20b, the same effect as that of FIG. 4 and FIG. 5 can be obtained. For example, when the LED light source 20a irradiates light to the upper part of the illuminated surface 42 and the LED light source 20b irradiates light to the upper part of the illuminated surface 42, the lower part of the light distribution of the LED light source 20a overlaps with the upper part of the light distribution of the LED light source 20a, so that the same effect as that of FIG. 4 can be obtained. In addition, since a plurality of LED light sources 20 are arranged for one lens 11, the light distribution of the lighting device can be widely obtained, and the lighting device can be miniaturized.

[0084] Fig.10 (b) is a side view showing another example of the lighting device according to the eighth embodiment.

[0085] like Fig.10 As shown in (b), the lighting device 1 has LED light sources 20a and 20b arranged on LED substrates 21a and 21b, respectively. In addition, the lighting device 1 is provided with moving mechanisms 26a and 26b (second moving mechanisms) for moving the LED light sources 20a and 20b in the x direction, respectively. Thus, since the positions of the LED light sources 20a and 20b can be changed, respectively, the same Fig. 9 Same effect.

[0086] Industrial Applicability

[0087] The lighting device disclosed herein can be used in performances in limited narrow spaces such as indoors, trains, cars, and airplanes, can be miniaturized, and can be arranged near an illuminated surface.

[0088] Explanation of symbols

[0089] 1. 1a~1g Lighting device

[0090] 10 Lens section

[0091] 11, 11a~11c lenses

[0092] 111 Incident surface

[0093] 111a convex part

[0094] 112 Ejection surface

[0095] 114 Cutting line

[0096] 20, 20a, 20b LED light source

[0097] 21, 21a, 21b LED substrate

[0098] 22 visor

[0099] 23 Absorption layer

[0100] 24, 24a Stray light mask

[0101] 25 Cage

[0102] 26 Moving mechanism (1st moving mechanism)

[0103] 26a, 26b Moving mechanism (second moving mechanism)

[0104] 41 Floor

[0105] 42 Irradiated surface

[0106] S1~S8 light distribution.

Claims

1. A lighting device that irradiates light onto an illuminated surface. The lighting device comprises: light source; and a lens having an incident surface for receiving light emitted from the light source and an emitting surface for emitting the light received at the incident surface, The emission surface is a convex surface, A curvature of the emitting surface in a first direction perpendicular to the optical axis direction of the lens is smaller than a curvature of the emitting surface in a second direction perpendicular to the optical axis direction and the first direction.

2. The lighting device according to claim 1, wherein: The incident surface is a concave curved surface.

3. The lighting device according to claim 2, wherein: The incident surface has a convex portion formed at a central portion of the incident surface.

4. The lighting device according to claim 1, wherein: The emitting surface has a first end and a second end in the second direction, The first end has a first curvature in the first direction, The second end portion has a second curvature in the first direction that is different from the first curvature.

5. The lighting device according to claim 4, wherein: The first curvature is a negative curvature. The second curvature is a positive curvature.

6. The lighting device according to claim 4 or 5, wherein: The emitting surface further has a third end and a fourth end in the first direction, The third end portion has a third curvature in the second direction, The fourth end portion has a fourth curvature in the second direction that is different from the third curvature.

7. The lighting device according to claim 6, wherein: The third curvature is a negative curvature. The fourth curvature is a positive curvature.

8. The lighting device according to claim 1, wherein: The emitting surface has a third end and a fourth end in the first direction, The third end portion has a third curvature in the second direction, The fourth end portion has a fourth curvature in the second direction that is different from the third curvature.

9. The lighting device according to claim 8, wherein: The third curvature is a negative curvature. The fourth curvature is a positive curvature.

10. The lighting device according to claim 1, wherein: The emitting surface has a cut line portion provided at one end portion of the emitting surface in the second direction for reducing a curvature.

11. The lighting device according to claim 1, wherein: The lighting device further comprises: The plurality of lenses are arranged along the first direction; a light shielding plate disposed in a slit formed between the plurality of lenses; an absorption layer, arranged on the surfaces of the plurality of lenses on the first direction side, and absorbing light; and The stray light mask is configured to cover the outer periphery of the emission surface.

12. The lighting device according to claim 11, wherein: The lighting device further comprises: a plurality of said shading panels; and The connecting holder connects the plurality of light shielding plates.

13. The lighting device according to claim 1, wherein: The lighting device further comprises: a first moving mechanism for changing the position of the light source; and a stray light mask configured to cover the outer periphery of the emission surface, The stray light mask moves on the emission surface in accordance with a change in the position of the light source by the first moving mechanism.

14. The lighting device according to claim 1, wherein: The lighting device further comprises: a plurality of said light sources; and The second moving mechanism changes the positions of the plurality of light sources.

15. The lighting device according to claim 1, wherein: The lighting device further comprises a plurality of the light sources. The plurality of light sources are arranged so that a light distribution of one of the plurality of light sources partially overlaps a light distribution of another of the plurality of light sources.

16. The lighting device according to claim 15, wherein: The plurality of light sources emit lights of different colors from each other.

Images