JP2016149266A - Luminaire, illumination system and mobile body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire capable of reducing unevenness in illumination light.SOLUTION: A long luminaire 10 includes: a light source (linear light source 20); and a long optical member 30 for emitting light entered from the light source. The optical member 30 includes: a long light incident surface 30b in which light from the light source enters; and a long light emission surface 30a from which the light entered from the light incident surface 30b emits. In the optical member 30, a plurality of light diffusion parts 31 are provided, and each light distribution angle of the plurality of light diffusion parts 31 in the longitudinal direction of the optical member 30 is larger than that in a central part in one end part in the longitudinal direction.SELECTED DRAWING: Figure 5D

Description

  The present invention relates to a lighting device, a lighting system, and a moving object including the lighting device or the lighting system.

  There exists an illuminating device which light-emits light in arbitrary shapes using optical members, such as a light-guide plate, for example (refer patent document 1). The lighting device includes a light source and an optical member that diffuses light from the light source. The light source is, for example, an LED light source using a plurality of LED (Light Emitting Diode) elements. On the light emitting surface of the optical member, a plurality of hemispherical convex portions having a diameter of about 1 to 1.5 mm, for example, are formed as light diffusing portions.

JP 2014-116236 A

  Such an illuminating device is used also for mobile bodies, such as an airplane, for example. In an airplane cabin, a linear LED light source may be used due to the arrangement space of the lighting device. For example, a plurality of linear LED light sources are arranged in series in the longitudinal direction of the light source along the longitudinal direction of the airplane cabin.

  However, when a plurality of linear LED light sources are arranged in series in the longitudinal direction of the light source, a gap is often provided between adjacent linear LED light sources. As a result, there is a problem that a dark portion, that is, unevenness of the irradiated light occurs in the vicinity of the gap of the irradiated surface irradiated with the emitted light from the adjacent linear LED light sources.

  Then, an object of this invention is to provide the illuminating device which can reduce the nonuniformity of illumination light, an illumination system, and the moving body using the said illumination device or illumination system.

  In order to achieve the above object, an illumination device according to one embodiment of the present invention is a long illumination device including a light source and a long optical member that emits light incident from the light source. The optical member includes a long light incident surface on which light from the light source is incident and a long light output surface from which light incident from the light incident surface is emitted. The optical member includes a plurality of light beams. A diffusion part is provided, and each light distribution angle in the longitudinal direction of the optical member of the plurality of light diffusion parts is larger than the central part at one end part in the longitudinal direction.

  The present invention can provide an illumination device, an illumination system, and a moving body using the illumination device or the illumination system that can reduce unevenness of illumination light.

FIG. 1 is a cross-sectional view illustrating an example of a cross section of a moving body according to an embodiment. FIG. 2 is a perspective view illustrating an example of an internal space of the moving body according to the embodiment. FIG. 3 is a cross-sectional view illustrating an example of the arrangement of the illumination devices in the moving body according to the embodiment. FIG. 4A is a perspective view illustrating an example of an appearance of the lighting apparatus according to the embodiment. FIG. 4B is a cross-sectional view illustrating an example of the configuration of the lighting device according to the embodiment. FIG. 5A is a perspective view illustrating an example of the appearance of the light guide plate according to the embodiment. FIG. 5B is a top view illustrating an example of the configuration of the light guide plate according to the embodiment. FIG. 5C is a cross-sectional view illustrating an example of the configuration of the light guide plate according to the embodiment. FIG. 5D is another cross-sectional view illustrating an example of the configuration of the light guide plate according to the embodiment. FIG. 6 is a diagram illustrating a wall surface of an airplane provided with the illumination system according to the embodiment. FIG. 7 is a cross-sectional view illustrating a configuration of an optical member according to Modification 1 of the embodiment. FIG. 8 is a cross-sectional view illustrating a configuration of an optical member according to Modification 2 of the embodiment.

  Below, the illuminating device which concerns on embodiment of this invention, an illuminating system, and the mobile body using the said illuminating device or the said illuminating system are demonstrated in detail using drawing. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangements, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member.

(Embodiment)
The lighting device, the lighting system, and the moving body using the lighting device or the lighting system according to the embodiment will be described with reference to FIGS. In the present embodiment, a case where the moving body is an airplane will be described as an example.

[1-1. Configuration of moving body]
FIG. 1 is a cross-sectional view illustrating an example of a cross section of a moving body. FIG. 2 is a perspective view showing an example of the internal space of the moving body. FIG. 3 is a cross-sectional view illustrating an example of an arrangement of lighting devices in a moving body.

  As shown in FIGS. 1 to 3, seat groups 141 to 144, a plurality of overhead bins 111 to 114, and lighting systems 101 to 106 are arranged in the cabin R of the airplane 100. Outside the airplane 100, there are main wings 151 and 152, horizontal tails 153 and 154, and vertical tail 155. A plurality of windows 133 are provided on the wall surfaces 131 and 132 of the fuselage of the airplane 100.

  Each of the seat groups 141 to 144 is composed of a plurality of seats in two rows arranged along the longitudinal direction of the airplane 100. The seat groups 141 to 144 are disposed on both sides of the passages 161 and 162 in FIG. In FIG. 1, the seat group 141 is a two-row seat group provided between the wall surface 131 and the passage 161. The seat group 142 is a two-row seat group provided between the passage 161 and the seat group 143. The seat group 143 is a two-row seat group provided between the seat group 142 and the passage 162. The seat group 144 is a two-row seat group provided between the passage 162 and the wall surface 132.

  Each of the plurality of overhead bins 111 to 114 is a long luggage case arranged along the front-rear direction of the airplane 100. The plurality of overhead bins 111 to 114 are provided corresponding to the seat groups 141 to 144. Each of the plurality of overhead bins 111 to 114 is disposed on the ceiling above the corresponding seat group 141 to 144. The plurality of overhead bins 111 and 112 are configured such that the lid portion opens toward the passage 161. The plurality of overhead bins 113 and 114 are configured such that the lid portion opens toward the passage 162.

  Each of the plurality of lighting systems 101 to 106 includes a plurality of lighting devices 10. Here, the plurality of lighting devices 10 constituting the lighting systems 101 to 106 are long lighting devices as will be described later, and are arranged in series in the longitudinal direction along the longitudinal direction of the airplane 100.

  Each of the plurality of illuminating devices 10 is a long illuminating device, and a linear light source and an optical member are accommodated in a long casing having a rectangular cross section. Here, the installation position of the illumination device 10 will be described, and the configuration of the illumination device 10 will be described in detail later.

  The lighting systems 101 and 106 are disposed between the wall surface 131 and the overhead bin 111 and between the wall surface 132 and the overhead bin 114, respectively. The lighting systems 102 and 103 are disposed between the ceiling 121 and the overhead bins 111 and 112, respectively. The lighting systems 104 and 105 are disposed between the ceiling 122 and the overhead bins 113 and 114, respectively.

  The plurality of illumination devices 10 constituting the illumination system 101 outputs illumination light toward the wall surface 131. The plurality of illumination devices 10 constituting the illumination systems 102 and 103 output illumination light toward the ceiling 121. The plurality of lighting devices 10 constituting the lighting systems 104 and 105 output illumination light toward the ceiling 122. The plurality of lighting devices 10 constituting the lighting system 106 outputs illumination light toward the wall surface 132.

  More specifically, the plurality of lighting devices 10 constituting the lighting system 101 are arranged between the wall surface 131 and the overhead bin 111 so that the illumination light faces the wall surface 131. The plurality of lighting devices 10 constituting the lighting system 102 are arranged between the ceiling 121 and the overhead bin 111 in a posture in which the illumination light faces the ceiling 121. The plurality of lighting devices 10 constituting the lighting system 103 are arranged between the ceiling 121 and the overhead bin 112 in a posture in which the illumination light faces the ceiling 121. The plurality of lighting devices 10 constituting the lighting system 104 are arranged between the ceiling 122 and the overhead bin 113 in such a posture that the illumination light faces the ceiling 122. The plurality of lighting devices 10 constituting the lighting system 105 are arranged between the ceiling 122 and the overhead bin 114 in a posture in which the illumination light faces the ceiling 122. The plurality of lighting devices 10 constituting the lighting system 106 are arranged between the wall surface 132 and the overhead bin 114 in a posture in which the illumination light faces the wall surface 132.

  Further, as shown in FIG. 2, a gap 123 is provided between the plurality of lighting devices 10 constituting the lighting systems 101 and 102. As a result, a space necessary for installing the lighting device 10 is secured. Although not shown, in the illumination systems 103 to 106, gaps 123 are similarly provided between the plurality of illumination devices 10.

  In a moving body such as the airplane 100, the illumination device 10 does not directly output illumination light toward the seat groups 141 to 143, but the light reflected by the ceiling 121 or 122 and the wall surface 131 or 132 is used. 143 is illuminated.

[1-2. Configuration of lighting apparatus]
FIG. 4A is a perspective view illustrating an example of an appearance of the lighting apparatus according to the present embodiment. FIG. 4B is a cross-sectional view illustrating an example of a configuration of the lighting device according to the present embodiment.

  4A and 4B, the direction of the illumination light output, that is, the direction of the light distribution axis of the illumination light is the Z-axis direction. In the following, the direction of the light distribution axis is also simply referred to as the direction of light distribution.

  As will be described in detail later, the casing 11 of the lighting device is elongated, and an axis parallel to the longitudinal direction of the casing 11 and perpendicular to the Z axis is taken as the Y axis. The X axis is an axis orthogonal to the Y axis and the Z axis.

  FIG. 4A shows the lighting device 10 with the optical member 30 removed for explanation. FIG. 4B is a view of a cross section parallel to the XZ plane including the IVB-IVB line of the lighting apparatus 10 shown in FIG. 4A as viewed from the negative side of the Y axis. FIG. 4B illustrates the illumination device with the optical member 30 attached.

  As illustrated in FIG. 4B, the illumination device 10 includes a housing 11, a linear light source 20, and an optical member 30.

  The housing 11 is a member that houses the linear light source 20 and the optical member 30, and is a long member having a rectangular cross section parallel to the XZ plane.

  The casing 11 is formed with a rectangular opening 11b on an upper surface 11a (a surface on the positive side of the Z axis among two surfaces parallel to the XY plane). The opening part 11 b is an opening part for emitting the light output from the linear light source 20 to the outside of the housing 11.

  Further, the casing 11 is open at an end surface (a surface parallel to the XZ plane) and is covered with a side plate 12 whose surface shape is rectangular. When the lighting device 10 is assembled, the linear light source 20 and the optical member 30 are inserted into the housing 11 from the opened end face. After the linear light source 20 and the optical member 30 are accommodated in the housing 11, the end surface is closed by the side plate 12. Note that the shape of the surface of the side plate 12 is substantially the same as the shape of the end surface of the housing 11. The side plate 12 is fixed to the housing 11 with screws 13.

  Each of the side surfaces 11c parallel to the YZ plane of the housing 11 is provided with a rib 11d for supporting the optical member 30. The rib 11d is a plate-like convex portion that extends from the side surface 11c toward the inside of the housing 11 and has a rectangular shape parallel to the XY plane. The length of the rib 11d in the Y-axis direction is the same as the length of the housing 11 in the Y-axis direction. The length of the rib 11d in the X-axis direction is determined so that the distance between the two ribs 11d is longer than the length of the opening 11b provided in the upper surface 11a in the X-axis direction. In other words, as shown in FIG. 4B, the length of the rib 11d in the X-axis direction is shorter than the length of the upper surface 11a in the X-axis direction (the length from the side surface 11c to the opening 11b).

  An end 30d of an optical member 30 described later is inserted between the upper surface 11a of the housing 11 and the rib 11d. The length in the X-axis direction inside the housing 11, the length of the linear light source 20, and the length of the optical member 30 are substantially the same. The length of the opening 11b in the X-axis direction and the distance between the two ribs 11d are shorter than the length of the optical member 30 in the X-axis direction. Further, the area of the region (length in the X-axis direction) where the upper surface 11 a is in contact with the optical member 30 and the area of the region where the rib 11 d is in contact with the optical member 30 are areas necessary for fixing the optical member 30.

  The bottom surface 11 e of the housing 11 is formed with a recess that can accommodate the linear light source 20. The depth of the recess is smaller than the thickness of the substrate 21 of the linear light source 20. The linear light source 20 is fixed to the housing 11 by bonding, screwing, or both.

  Further below the bottom surface 11e (on the negative side of the Z-axis), leg portions 11f for fixing the lighting device 10 to the ceilings 121 and 122 or the wall surfaces 131 and 132 of the airplane 100 are provided. A plurality of circular openings 11g for screwing to the ceilings 121 and 122 or the wall surfaces 131 and 132 are formed in the leg portion 11f.

  As shown in FIGS. 4A and 4B, the linear light source 20 has a plurality of LED groups 22 arranged on a plate-like substrate 21 having a long surface shape. In the present embodiment, each of the LED groups 22 includes four color LED elements, a red LED element 221, a green LED element 222, a blue LED element 223, and a white LED element 224 ( 4A and 4B, not shown, see FIG. 5B).

  The four LED elements 221, 222, 223, and 224 are an example of a light emitting element. In the present embodiment, the LED elements 221, 222, 223, and 224 are linearly arranged along a straight line that is parallel to the longitudinal direction of the substrate 21 and passes through the center of the substrate 21. ing. Furthermore, in this Embodiment, the some LED group 22 is arrange | positioned along the said straight line (refer FIG. 5B).

  The arrangement of the LED elements 221, 222, 223, and 224 is not limited to a linear shape. In each LED group 22, other arrangements such as four LED elements 221, 222, 223, and 224 arranged in a 2 × 2 matrix may be used.

  The optical member 30 is a translucent member that emits light incident from the linear light source 20. A plurality of light diffusing portions 31 are provided on the light emitting side (Z-axis positive side) surface of the optical member 30. The optical member 30 will be described in detail below.

[1-3. Optical member]
Next, the optical member 30 will be described with reference to FIGS.

  FIG. 5A is a perspective view illustrating an example of an appearance of the optical member 30 according to the present embodiment. FIG. 5B is a top view showing an example of the configuration of the optical member 30 according to the present embodiment. FIG. 5C is a cross-sectional view illustrating an example of the configuration of the optical member 30 according to the present embodiment. 5C shows a cross section of the optical member 30 in a plane parallel to the Z axis including the VC-VC line of FIG. 5B. FIG. 5D is another cross-sectional view illustrating an example of the configuration of the optical member 30 according to the present embodiment. FIG. 5D shows a cross section of the optical member 30 in a plane parallel to the Z axis including the VD-VD line in FIG. 5B.

  As illustrated in FIGS. 5A to 5D, the optical member 30 is an example of a translucent member that emits light incident from the linear light source 20. The optical member 30 of the present embodiment diffuses the emitted light in the longitudinal direction (Y-axis direction) and collects the light to some extent in the X-axis direction orthogonal to the longitudinal direction. By diffusing the emitted light in the longitudinal direction, unevenness in brightness is reduced between the area between the illumination apparatus 10 and another illumination apparatus 10 and the area directly illuminated by the illumination apparatus 10. Further, in the X-axis direction, by concentrating the emitted light to some extent, it is possible to efficiently irradiate a ceiling or wall with a lot of light.

  The optical member 30 is a plate-like member having a rectangular shape (plane parallel to the XY plane). For example, the optical member 30 has a length in the longitudinal direction (Y-axis direction) of 15 to 30 cm, a length in the X-axis direction of about 3 cm, and a thickness of about 3 mm.

  The optical member 30 includes a long light incident surface 30b on which light from the linear light source 20 is incident and a long light output surface 30a from which light incident from the light incident surface 30b is emitted.

  The light incident surface 30b is provided with a plurality of grooves 33 constituting a Fresnel lens. That is, the optical member 30 has a Fresnel lens that condenses the light incident from the light incident surface 30 b in a direction perpendicular to the longitudinal direction of the optical member 30 on the light incident surface 30 b. The groove 33 has, for example, an incident part where light from the linear light source 20 is directly incident and a reflecting part that reflects light incident on the incident part.

A plurality of light diffusion portions 31 are provided on the light emitting surface 30a. The light diffusing unit 31 has a convex curved surface. In this embodiment, the light diffusion portion 31 is a substantially spherical convex portion having a diameter of 1.0 to 2.0 mm and a height of about 0.1 mm. By such a plurality of light diffusion portions 31, the light incident on the optical member 30 from the linear light source 20 is diffused and emitted. For this reason, unevenness of the light emitted from the optical member 30 is reduced. More specifically, on the irradiation surface of the light emitted from the optical member 30, linear unevenness, graininess due to unevenness corresponding to each LED element, color unevenness due to each LED element emitting light of a different color, etc. Generation can be reduced. Further, unevenness of the light emitting surface 30a of the optical member 30 is also reduced. That is, graininess due to unevenness corresponding to each LED element generated on the light emitting surface 30a, uneven color due to each LED element emitting light of a different color, and the like are reduced. The shape of the light diffusing portion 31 is not limited to a substantially spherical convex portion, and may be a conical shape, a triangular pyramid shape, or a concave portion. The light diffusion part 31 preferably has a diameter of about 0.2 to 2 mm when the bottom area is about 2 mm ² and the bottom surface is circular. The size of the light diffusing unit 31 may not be the same for all the light diffusing units 31. Moreover, in each figure, in order to make it easy to understand the operation of the light diffusing unit 31, the height of the light diffusing unit 31 is shown to be significantly larger than the actual height.

  FIG. 5B shows the arrangement of the light diffusing unit 31 and the arrangement of the LED elements 221 to 224. As shown in FIG. 5B, the arrangement direction of the plurality of LED elements and the arrangement direction of the plurality of light diffusion portions 31 substantially coincide with each other, but these arrangement directions intersect in a plan view with respect to the light emitting surface 30a. It may be. By arranging the arrangement direction of the plurality of LED elements and the arrangement direction of the plurality of light diffusion portions 31 at an angle of less than 90 degrees, unevenness of light output from the optical member 30 is further reduced.

  As shown in FIG. 5C, a notch 30e whose XZ plane shape is rectangular is formed at the end of the light emitting surface 30a of the optical member 30 in the X-axis direction. The shape of the notch 30e depends on the shape of the upper surface 11a of the housing 11. In other words, the notch 30e is formed in a region where the light emitting surface 30a contacts. With this configuration, the opening 11b of the housing 11 is closed by the light emitting surface 30a. Further, the end 30 d in the X-axis direction of the optical member 30 is sandwiched between the upper surface 11 a of the housing 11 and the rib 11 d and is fixed to the housing 11. Further, a notch 30e is formed so that a step from the end upper surface 30c, which is the upper surface of the end 30d in the X-axis direction, to the light emitting surface 30a is substantially the same as the thickness of the upper surface 11a of the housing 11. .

  As illustrated in FIG. 5D, the shape of the light diffusing unit 31 varies depending on the position of the optical member 30 in the longitudinal direction. Specifically, each light distribution angle in the longitudinal direction of the optical member 30 of the plurality of light diffusion portions 31 is larger than the central portion at one end portion in the longitudinal direction of the optical member 30. Moreover, in this Embodiment, each light distribution angle in the said longitudinal direction of the some light-diffusion part 31 is larger than a center part also in the other end part of the said longitudinal direction. That is, in the present embodiment, the light distribution angle of each of the light diffusion portions 31a and 31c at both ends in the longitudinal direction (Y-axis direction) of the optical member 30 is larger than the light distribution angle of the light diffusion portion 31b at the central portion. . Here, the light distribution angle of the light diffusing unit 31 means a light distribution angle of light emitted from the light diffusing unit 31 when light having a positive Z-axis direction is incident on the light diffusing unit 31.

  In order to realize such a light distribution characteristic, in this embodiment, as shown in FIG. 5D, the light diffusion portions 31a, 31b, and 31c have substantially spherical curved surfaces, and the curvature radius of the curved surface is The both ends of the optical member 30 in the longitudinal direction are smaller than the central portion. Thereby, as shown by the broken-line arrows in FIG. 5D, the light is refracted by the light diffusion portions 31a, 31b, and 31c, and the above-described light distribution characteristic can be realized.

  As described above, the light emitted from both ends in the longitudinal direction of the illumination device 10 is diffused in the longitudinal direction of the illumination device 10. That is, the diffusion in the Y-axis direction of the illumination device 10 in FIG. 4A is increased. Therefore, in the illumination system in which the two illumination devices 10 are arranged in series in the longitudinal direction, illuminance unevenness that occurs in the vicinity of the gap 123 between the two illumination devices 10 can be reduced. Here, the illuminance unevenness reducing effect of the lighting device 10 will be described with reference to FIG. FIG. 6 is a diagram illustrating a wall surface 131 of the airplane 100 provided with the illumination system 101 according to the present embodiment. As shown in FIG. 6, light is diffused as indicated by broken-line arrows at the ends in the longitudinal direction of the illumination device 10 constituting the illumination system 101. For this reason, light is also irradiated in the vicinity of the gap 123 between the two illuminating devices 10 arranged in series in the longitudinal direction, and irradiation unevenness on the wall surface 131 that is the irradiation surface is reduced. In particular, as shown in FIG. 6, the illumination system 101 is configured so that a region 134 irradiated with light from both of the two illumination devices 10 arranged in series in the longitudinal direction is formed. The illuminance in region 134 is increased. Thereby, since the difference in illuminance between the region 134 and the other irradiation region is reduced, the irradiation unevenness on the wall surface 131 is further reduced.

  In the above description, the light distribution angle of the light diffusion portions 31a and 31c provided at both ends in the longitudinal direction of the optical member 30 is larger than the light distribution angle of the light diffusion portion 31b provided at the center portion. However, only the light distribution angle of the light diffusion portion 31a provided at one end in the longitudinal direction of the optical member 30 may be larger than the light distribution angle of the light diffusion portion 31b provided at the center portion. Further, the light distribution angle of the light diffusion portion 31a provided at one end portion and the light distribution angle of the light diffusion portion 31c provided at the other end portion may be different. Also with these configurations, the diffusion of light in the longitudinal direction of the illumination device 10 can be increased.

[2. Modification 1 of Lighting Device]
Modification 1 of the present embodiment will be described with reference to FIG. In the present modification, the configuration of the light distribution angles of the plurality of light diffusion units is different from the configuration of the illumination device 10 according to the above embodiment, and the other configurations are the same as the configuration of the illumination device 10 according to the above embodiment. It is the same.

  FIG. 7 is a cross-sectional view showing a configuration of an optical member 30A according to this modification. FIG. 7 is a cross-sectional view corresponding to the cross-sectional view shown in FIG. 5D of the optical member 30 according to the above embodiment.

  As shown in FIG. 7, in the optical member 30 </ b> A according to this modification, the light distribution angle of each of the plurality of light diffusing portions gradually increases from the center portion in the longitudinal direction to one end portion of the optical member 30 </ b> A. In addition, the light distribution angle of each of the plurality of light diffusing portions gradually increases from the central portion in the longitudinal direction to the other end portion of the optical member 30A. In other words, in the optical member 30A according to this modification, among the plurality of light diffusion portions, for example, the optical member 30A is provided from the central portion in the Y-axis direction in FIG. 7 to the end portion on the Y-axis negative side of the optical member 30A. The magnitude of the light distribution angle of each light diffusion portion gradually increases from the center in the Y-axis direction to the end on the Y-axis negative side. Moreover, in this modification, the magnitude of the light distribution angle of each of the light diffusion portions provided from the central portion in the Y-axis direction to the end portion on the Y-axis positive side in FIG. 7 is the Y-axis of the optical member 30A. It gradually increases from the center in the direction to the end on the Y axis positive side.

  In order to realize such light distribution characteristics, in this modification, as shown in FIG. 7, each light diffusion portion has a substantially spherical curved surface, and the curvature radius of the curved surface is the same as that of the optical member 30A. It gradually decreases from the center in the longitudinal direction to both ends. As a result, as indicated by the dashed arrows in FIG. 7, the light is refracted by the light diffusion portions 31d, 31e, and 31f, and the above-described light distribution characteristics can be realized.

  In the example shown in FIG. 7, the diameters D in the Y-axis direction (and the X-axis direction) of the plurality of light diffusion portions are substantially the same. In addition, the description that the diameters D of the plurality of light diffusion portions are substantially the same means that the difference from the average value of the diameters D is about 20% or less. Here, since the diameter D of the light diffusing portion can be optimized based on the dimension of the linear light source 20, the diameter D of all the light diffusing portions can be optimized.

  Also according to this modification, the light emitted from the illumination device 10 is diffused in the longitudinal direction of the illumination device 10. Therefore, in the illumination system in which the two illumination devices 10 are arranged in series in the longitudinal direction, unevenness in illuminance generated near the gap 123 between the two illumination devices 10 can be reduced. Furthermore, in this modification, the magnitude of the light distribution angle of each light diffusion portion gradually increases from the center in the longitudinal direction to one end, so that the amount of change in the light distribution angle between adjacent light diffusion portions is reduced. Can do. Thereby, the nonuniformity of the irradiation light of the illuminating device 10 can further be reduced.

  In the above, the configuration in which the light distribution angles of the light diffusing parts gradually increase from the central part in the longitudinal direction of the optical member 30A to both end parts has been described, but from the central part in the longitudinal direction of the optical member to one end part. The light distribution angle of each light diffusion portion may be increased, and the light distribution angle of each light diffusion portion may not be increased from the center portion to the other end portion. In addition, the light distribution angle of the light diffusion portion 31d provided at one end may be different from the light distribution angle of the light diffusion portion 31f provided at the other end. Also with these configurations, the diffusion of light in the longitudinal direction of the illumination device 10 can be increased.

[3. Modification Example 2 of Lighting Device]
Modification 2 of the present embodiment will be described with reference to FIG. In the present modification, the configuration of the light distribution angles of the plurality of light diffusion units is different from the configuration of the illumination device 10 according to the above embodiment, and the other configurations are the same as the configuration of the illumination device 10 according to the above embodiment. It is the same.

  FIG. 8 is a cross-sectional view showing a configuration of an optical member 30B according to this modification. FIG. 8 is a cross-sectional view corresponding to the cross-sectional view shown in FIG. 5D of the optical member 30 according to the above embodiment.

  As shown in FIG. 8, in the optical member 30B according to this modification, the light distribution angle of each of the plurality of light diffusing portions is the longitudinal direction of the optical member 30A, as in the optical member 30A according to the modification 1. It gradually increases from the center to one end. In addition, the light distribution angle of each of the plurality of light diffusing portions gradually increases from the central portion to the other end portion in the longitudinal direction of the optical member 30B. In this modification, the heights H in the Z-axis direction (that is, the thickness direction of the optical member 30B) of the plurality of light diffusion portions are substantially the same. Note that the description that the heights H of the plurality of light diffusion portions are substantially the same means that the difference from the average value of the heights H is about 20% or less.

  In the example shown in FIG. 8, a spherical light diffusion portion 31h provided at the center in the Y-axis (longitudinal) direction of the optical member 30B and spherical light diffusion portions 31g provided at both ends in the Y-axis direction. And the height H of 31i is substantially the same. Moreover, the curvature radius of the curved surface which the light-diffusion part 31h has is larger than the light-diffusion parts 31g and 31i. Further, the curvature radius of the curved surface of each of the plurality of light diffusion portions gradually decreases from the central portion to one end portion in the Y-axis direction, and correspondingly, the light distribution angle of each of the plurality of light diffusion portions is an optical member. It gradually increases from the central portion of 30B in the Y-axis direction to the one end portion.

  Thereby, since the flatness of the light emitting surface 30a of the optical member 30B is improved, it is possible to suppress a sense of incongruity caused by the inclination of the light emitting surface that the user feels when viewing the optical member 30B.

  In this modification, the diameter D in the Y-axis direction (and the X-axis direction) of the light diffusing portion gradually decreases from the central portion in the longitudinal direction of the optical member 30B to both end portions.

  Also according to this modification, the light emitted from the illumination device 10 is diffused in the longitudinal direction of the illumination device 10. Therefore, in the illumination system in which the two illumination devices 10 are arranged in series in the longitudinal direction, unevenness in illuminance that occurs in the vicinity of the gap 123 between the two illumination devices 10 can be reduced. Furthermore, in this modification, the magnitude of the light distribution angle of each light diffusion portion gradually increases from the center in the longitudinal direction to one end, so that the amount of change in the light distribution angle between adjacent light diffusion portions can be reduced. . Thereby, the nonuniformity of the irradiation light of the illuminating device 10 can further be reduced.

  In the above, the configuration in which the light distribution angles of the light diffusion portions gradually increase from the central portion in the longitudinal direction to the both ends of the optical member 30B has been described. The light distribution angle of each light diffusion portion may be increased, and the light distribution angle of each light diffusion portion may not be increased from the center portion to the other end portion. Moreover, the light distribution angle of the light diffusion part 31g provided in one end part and the light distribution angle of the light diffusion part 31i provided in the other end part may be different. Also with these configurations, the diffusion of light in the longitudinal direction of the illumination device 10 can be increased.

[4. Effect etc.]
As described above, the illuminating device 10 of the present embodiment is a long illuminating device 10, and includes a linear light source 20 and a long optical member that emits light incident from the linear light source 20. The optical member 30 includes a long light incident surface 30b on which light from the linear light source 20 is incident, and a long light output surface 30a on which light incident from the light incident surface 30b is emitted. The optical member 30 is provided with a plurality of light diffusing portions 31, and each light distribution angle in the longitudinal direction of the optical member 30 of the plurality of light diffusing portions 31 is larger than the central portion at one end portion in the longitudinal direction. .

  Thus, in the illuminating device 10 of this Embodiment and a modification, the nonuniformity of illumination light can be reduced by using the optical member provided with the several light-diffusion part. Moreover, since the said illuminating device 10 can diffuse light in the longitudinal direction, even when using the several illuminating device 10 arrange | positioned in series in a longitudinal direction, the gap | interval 123 vicinity between the illuminating devices 10 is used. Generation of unevenness (dark part) can be suppressed.

  Moreover, in the illuminating device 10 of this Embodiment, each light distribution angle of the several light-diffusion part 31 may increase gradually from a center part to one end part.

  Thereby, since the variation | change_quantity of the magnitude | size of the light distribution angle between adjacent light-diffusion parts can be reduced, the nonuniformity of the irradiation light of the illuminating device 10 can further be reduced.

  Moreover, in the illuminating device 10 of this Embodiment, the some light-diffusion part 31 may have a substantially spherical curved surface, and the curvature radius of the said curved surface may be smaller than a center part in one end part.

  In the illumination device 10 of the present embodiment, the heights of the plurality of light diffusion portions in the thickness direction of the optical member 30 may be substantially the same.

  Thereby, since the flatness of the light emitting surface 30a of the optical member 30B is improved, it is possible to suppress a sense of incongruity caused by the inclination of the light emitting surface that the user feels when viewing the optical member 30B.

(Other embodiments)
As mentioned above, although the illuminating device and moving body which concern on this invention were demonstrated based on the said embodiment and its modification, this invention is not limited to said embodiment.

  For example, in the above-described embodiment and its modifications, the optical member has a plate shape, but may have other shapes. For example, a hybrid lens may be provided on the linear light source 20 side.

  Moreover, in the said embodiment and its modification, although the linear light source 20 was used, as a light source of an illuminating device, the light source which can radiate | emit illumination light substantially uniformly from a elongate illuminating device. If it is.

  In the above-described embodiment and its modification, the light diffusing unit is provided on the light emitting surface 30a of the optical member. For example, when the Fresnel lens is not provided on the light incident surface 30b, The light diffusion part may be provided on the light incident surface 30b.

  Moreover, in the modification 2 of the said embodiment, although the structure where the height H of the some light-diffusion part which has a convex-shaped curved surface is substantially the same was employ | adopted, the optical member has several concave-shaped curved surface. This configuration can also be adopted when the light diffusing unit is provided. When the optical member has a plurality of light diffusing portions having concave curved surfaces, the depth of the concave portions can be defined as the height H.

  Moreover, in the said embodiment and its modification, a light source is not limited to a linear light source. Other light sources may be used as long as they can emit substantially uniform irradiation light from the light exit surface of the long optical member of the illumination device. For example, LED elements arranged in a matrix may be used as the light source.

  Further, as the LED element constituting the linear light source 20, an SMD type light emitting module in which a surface mount device (SMD: Surface Mount Device) type LED is mounted on the substrate 21 may be used, or the LED chip is directly on the substrate 21. A mounted COB (Chip On Board) type light emitting module may be employed. Moreover, you may use other solid light emitting elements, such as an organic EL (Electro Luminescence) element.

  In the lighting system, the two lighting devices 10 may be disposed adjacent to each other without providing the gap 123. Since the light output in the vicinity of the ends of the illuminating device 10 is generally weak, even when the two illuminating devices 10 are arranged adjacent to each other, unevenness (dark part) of the irradiated light can occur in the vicinity of the ends of the two illuminating devices 10. . Therefore, by configuring the illumination system using the illumination device 10 according to the above-described embodiment and the modification thereof, the effect of suppressing unevenness of irradiation light in the vicinity of the end portion of the illumination device 10 is exhibited even in the above-described arrangement.

  Moreover, in the said embodiment and its modification, although the airplane 100 was illustrated as a moving body to which the illuminating device 10 is applied, it is not limited to this. For example, the lighting device may be applied to trains, buses, ships, and the like. Moreover, the said illuminating device may be applied other than a moving body.

  In addition, the embodiment can be realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

10 Illumination Device 20 Linear Light Source (Light Source)
30, 30A, 30B Optical member 30a Light exit surface 30b Light entrance surface 31, 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h, 31i Light diffusion unit 100 Airplane (moving object)

Claims (9)

A long lighting device,
A light source;
An elongate optical member that emits light incident from the light source, and
The optical member includes a long light incident surface on which light from the light source is incident, and a long light output surface from which light incident from the light incident surface is emitted,
The optical member is provided with a plurality of light diffusion portions,
The light distribution angle in the longitudinal direction of the optical member of the plurality of light diffusion portions is larger than the central portion at one end portion in the longitudinal direction. The illuminating device according to claim 1, wherein a light distribution angle of each of the plurality of light diffusion portions gradually increases from the central portion to the one end portion. The lighting device according to claim 1, wherein the plurality of light diffusion portions have a substantially spherical curved surface, and a radius of curvature of the curved surface is smaller than the central portion at the one end portion. The lighting device according to claim 3, wherein heights of the plurality of light diffusion portions in a thickness direction of the optical member are substantially the same. The illumination device according to claim 1, wherein the optical member includes a Fresnel lens that condenses light incident from the light incident surface in a direction perpendicular to the longitudinal direction on the light incident surface. . The lighting device according to claim 1, wherein the light diffusion portion has a convex curved surface. The lighting device according to claim 1, wherein the light diffusion portion has a concave curved surface. Two lighting devices according to any one of claims 1 to 7,
The two illumination devices are arranged in series in the longitudinal direction.   A moving object provided with the illuminating device of any one of Claims 1-7, or the illumination system of Claim 8.

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