Patent Publication Number: US-9903568-B2

Title: Lighting device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The application is based upon and claims the benefit of priority of Japanese Patent Application No. 2015-120363, filed on Jun. 15, 2015, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to lighting devices and particularly relates to a lighting device for emitting light to an illuminated surface of a target standing at an installation surface of the lighting device. 
     BACKGROUND ART 
     As a conventional example, a lighting device is introduced in a document 1 [JP 2015-002157 A]. The lighting device (a horizontal light) of the document 1 is installed to illuminate a wall surface (a horizontal surface) as a background in such as TV studios and stages. Examples of the horizontal light include a lower horizontal light which is installed at a floor side, and an upper horizontal light which is installed at a ceiling side. The horizontal light includes a lighting source unit, a power source unit to supply power to the lighting source unit, and a supporting unit to support the lighting source unit from the power source unit. The lighting source unit is placed with an incline posture which a predetermined angle faces upwards so that a front surface emitting the light faces toward a diagonally upward against a wall surface. 
     The lighting source unit includes a main body that is contained by a cover and a case which has an opening opened at a front surface. A light-emitting unit including a substrate on which plural LEDs are mounted and a reflection means are contained within the case. The plural LEDs are placed to form LED lines as lines along a horizontal direction on the substrate, and the LED lines are arranged to a top-and-bottom direction on the substrate. The reflection means includes a pair of reflection panels in the top-and-bottom direction which reflects light emitted to the top-and-bottom direction from the plural LEDs toward the opening. 
     Incidentally, the lighting device (horizontal light) of the document 1 is installed at either a lower place (floor side) or an upper place (ceiling side) relative to the wall surface (illuminated surface of a target). The lighting device controls a light distribution using a pair of reflection panels placed to the top-and-bottom direction of each of LED lines so that the lighting device emits light upward from the floor when being installed at the floor side and the lighting device emits light downward from the ceiling side when being installed at the ceiling surface. 
     However, the reflection panels of a constitution shown in the document 1 may occur an irregular illumination of the illuminated surface of the target. 
     SUMMARY 
     In view of the above insufficiency, an object of the present disclosure is to propose a lighting device capable of reducing an irregular illumination to an illuminated surface of a target. 
     A lighting device of an aspect in accordance with the present disclosure emits light to an illuminated surface of a target standing at an installation surface on which the lighting device is installed. The lighting device includes: a lighting source; a case accommodating the lighting source; and a light adjuster accommodated in the case and adjusting a path of light emitted from the lighting source. The lighting source includes a first lighting source and a second lighting source aligned along a predetermined direction in the case. The predetermined direction is a direction toward a second end of the case from a first end of the case, and a first end side is a side closer to the first end than the second end. The second lighting source is placed at the first end side of the first lighting source in the predetermined direction. The light adjuster includes a first reflection panel and a second reflection panel, both reflecting light emitted from the first lighting source, a third reflection panel and a fourth reflection panel, both reflecting light emitted from the second lighting source, a first light adjustment panel placed between the first reflection panel and the second reflection panel and a second light adjustment panel placed between the third reflection panel and the fourth reflection panel. A reflection surface of the first reflection panel and a reflection surface of the second reflection panel face each other in the predetermined direction. A reflection surface of the third reflection panel and a reflection surface of the fourth reflection panel face each other in the predetermined direction. The first light adjustment panel is placed between the reflection surface of the first reflection panel and the reflection surface of the second reflection panel, and shields a part of the light, which is emitted from the first lighting source to the first end side of an optical axis of the first lighting source. The second light adjustment panel is placed between the reflection surface of the third reflection panel and the reflection surface of the fourth reflection panel, and shields a part of the light, which is emitted from the second lighting source to the first end side of an optical axis of the second lighting source. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The figures depict one or more implementation in accordance with the present teaching, by way of example only, not by way of limitations. 
         FIG. 1  is an exemplary perspective view of a lighting device of an embodiment according to the present disclosure; 
         FIG. 2  is an exploded perspective view of a primary part of the lighting device; 
         FIG. 3  is a section view seen from the A 1 -A 2  of a primary part of the lighting device; 
         FIG. 4  is a plan view of a lighting source of the lighting device; 
         FIG. 5  is a perspective view of a primary part of the lighting device; 
         FIG. 6A  is a plan view of a primary part of the lighting device,  FIG. 6B  is a front view of the primary part of the above lighting device; 
         FIG. 7  is a layout view of a usage example of the lighting device; 
         FIG. 8  is a schematic view of a path of light from the lighting source of the lighting device; and 
         FIG. 9  is a schematic view of a path of light from a lighting source of a comparative example. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a lighting device according to an embodiment of the present disclosure is described in details with reference to drawings. However, in the following embodiment, a wall surface (horizontal surface) which is a background in such as in a TV studio or a stage assumed as a target illuminated, but the target is not limited to the wall surface which is the background. Note that, unless otherwise noted in the following explanation, in  FIG. 1 , an X-axis is defined as a predetermined direction, one end of the X-axis is defined as a first direction X 1 , and the other end of the X-axis is defined as a second direction X 2 . Besides, an axis which is perpendicular to the X-axis is defined as a Y-axis. One end of the Y-axis is defined as a first direction Y 1 , and the other end of the Y-axis is defined as a second direction Y 2 . An axis which is perpendicular to both the X-axis and the Y-axis is defined as a Z-axis. One end of the Z-axis is defined as a first direction Z 1  and the other end of the Z-axis is defined as a second direction Z 2 . 
     The lighting device  1  of the present embodiment is described referring to  FIG. 1  to  FIG. 9 . 
     As shown in  FIG. 1 , the lighting device  1  of the present embodiment includes a lighting source  4 , a case  2  containing the lighting source  4 , a light adjuster  3  contained within the case  2  and adjusting paths of light emitted from the lighting source  4 , plural heat sinks  5  dissipating heat generated from the lighting source  4 , and a stand holder  6  pivotally holding the case  2 . 
     As shown in  FIG. 2 , the case  2  includes a case  2 A and a case  2 B. The case  2 A includes a top cover  21 , a first panel  22 , and a second panel  23 . The case  2 B includes a mounting panel  24 . Note that, a first end of the case  2  is an end of the first direction X 1  side of the X-axis. A second end of the case  2  is an end of the second direction X 2  side of the X-axis. Besides, a first end side of the case  2  is a side which is closer to the first end of the case  2 , in spite of an inside or outside of the case  2 , than the second end of the case  2 . 
     The top cover  21  is formed into a box shape opened on the second direction Y 2  side, and includes a top surface  211  formed into a rectangle shape, and a pair of side surfaces  213  and a pair of side surfaces  214  protruded toward the second direction Y 2  from a peripheral edge of the top surface  211 . The pair of side surfaces  213  faces each other in the X-axis. The pair of side surfaces  214  faces each other in the Z-axis. An opening  212  is opened at the top surface  211  (refer to  FIG. 3 ). The first panel  22  is formed into a rectangular board by a translucent material, and placed at the second direction Y 2  side of the top surface  211  to cover the opening  212  of the top cover  21  (refer to  FIG. 3 ). The second panel  23  is formed into a rectangular board colored by desired colors, and placed to partially cover the first direction X 1  side of the first panel  22  from the second direction Y 2  side (refer to  FIG. 3 ). The mounting panel  24 , as shown in  FIG. 2  and  FIG. 3 , includes a bottom panel  240  is formed into a rectangular board to hold the lighting source  4  on a surface of the first direction Y 1  side, and a side panel  241  protruded toward the first direction Y 1  from an peripheral edge of the bottom panel  240 . The mounting panel  24  is placed to cover the opening placed at the second direction Y 2  side of the top cover  21 , and the mounting panel  24  is assembled to the top cover  21 . In other words, the side panel  241  is screwed to the side surfaces  213  and  214  of the top cover  21  with screws. 
     The lighting source  4 , as shown in  FIG. 2  and  FIG. 4 , includes two first lighting sources  41  placed in the Z-axis on a surface of the first direction Y 1  side of the mounting panel  24 , and two second lighting sources  42  placed in the Z-axis on the surface of the first direction X 1  side of the first lighting source  41 . In other words, two second lighting sources  42  are placed in a first end side of the case  2  (the first direction X 1  side of the X-axis) compared with two first lighting sources  41 . Each of the two first lighting sources  41  includes a lighting part  410  which has plural LEDs  412 . Besides, each of the two first lighting sources  41  includes a circuit board  411  on which the lighting part  410  and the like are mounted, and is placed at the mounting panel  24  so that a side of the circuit board  411  on which the plural LEDs  412  are mounted is faced to the first panel  22  (first direction Y 1 ). Each of the two second lighting sources  42  includes a lighting part  420  has plural LEDs  422 . Besides, each of the two second lighting sources  42  includes a circuit board  421  on which the lighting part  420  and the like are mounted, and is placed at the mounting panel  24  so that the side of the circuit board  421  on which the plural LEDs  422  are mounted is faced to the first panel  22  (first direction Y 1 )(refer to  FIG. 3 ). Note that, optical axes of the plural LEDs  412  and  422  are pointed to the first direction Y 1 . An optical axis of the first lighting source  41  indicates the optical axis of each of the plural LEDs  412 . Besides, an optical axis of the second lighting source  42  indicates the optical axis of each of the plural LEDs  422 . Each of the circuit boards  411  and  421  is assembled to the mounting panel  24  with screws. 
     As shown in  FIG. 4 , red LEDs  412 R and  422 R, green LEDs  412 G and  422 G, blue LEDs  412 B and  422 B, and white LEDs  412 W and  422 W are mounted on each of the circuit boards  411  and  421 . Note that, the circuit boards  411  and  421  shown in  FIG. 4  are one example and then the location patterns and colors of the LEDs  412  and  422  are not limited to  FIG. 4 . 
     The light adjuster  3 , as shown in  FIG. 3  and  FIG. 5 , includes a first reflection panel  31 , a second reflection panel  32 , a third reflection panel  33 , a fourth reflection panel  34 , a first light adjustment panel  35 , a second light adjustment panel  36 , a shielding panel  37 , a pair of side panels  38 , and a middle panel  39 . 
     The first reflection panel  31 , as shown in  FIG. 3  and  FIG. 6A , is formed into a rectangular shape extended in the Z-axis direction. An end of a shorter side of the first reflection panel  31  is placed at the second direction X 2  side of the first lighting source  41 . The first reflection panel  31  is placed within the case  2  so that the first reflection panel  31  inclines toward the second direction X 2  as a distance from the first lighting source  41  increases. The first reflection panel  31  is placed within the case  2  so that the end of the shorter side of the first reflection panel  31  is placed closer in the Y-axis direction to the first lighting source  41  compared with the other end of the shorter side of the first reflection panel  31 . A reflection surface  311  of the first reflection panel  31  is configured by processing a surface of the reflection surface  311  so that the emitted light reaches, through the first panel  22 , as far as possible in the second direction X 2 . For example, the surface of the reflection surface  311  may be processed as a mirror-processed. A configuration of the surface of the reflection surface  311  may be processed. 
     The second reflection panel  32  is formed into a rectangular shape extended in the Z-axis direction, and has a relatively shorter width in the Y-axis direction compared with a width of the first reflection panel  31  in the Y-axis direction. An end of a shorter side of the second reflection panel  32  is placed at the first direction X 1  side of the first lighting source  41 . The second reflection panel  32  is placed within the case  2  so that the second reflection panel  32  is inclined toward the first direction X 1  as a distance from the first lighting source  41  increases. The second reflection panel  32  is placed within the case  2  so that the end of the shorter side of the second reflection panel  32  is placed closer in the Y-axis direction to the first lighting source  41  compared with the other end of the shorter side of the second reflection panel  32 . The reflection surface  311  of the first reflection panel  31  and a reflection surface  321  of the second reflection panel  32  are placed to face to each other and reflect the light emitted from the first lighting source  41  to the first panel  22 . 
     The third reflection panel  33  is formed into a rectangular shape extended in the Z-axis direction. An end of a shorter side of the third reflection panel  33  is placed at the second direction X 2  of the second lighting source  42 . The third reflection panel  33  is placed to be inclined toward the second direction X 2  as a distance from the second lighting source  42  increases. The third reflection panel  33  is placed within the case  2  so that the end of the shorter side of the third reflection panel  33  is placed closer in the Y-axis direction to the second lighting source  42  compared with the other end of the shorter side of the third reflection panel  33 . 
     The fourth reflection panel  34  is formed into a rectangular shape extended in the Z-axis direction and has a width in the Y-axis direction longer than a width of the third reflection panel  33  in the Y-axis direction. An end of a shorter side of the fourth reflection panel  34  is placed at the first direction X 1  side of the second lighting source  42 . The fourth reflection panel  34  is placed to be inclined toward the first direction X 1  as a distance from the second lighting source  42  increases. The fourth reflection panel  34  is placed within the case  2  so that the end of the shorter side of the fourth reflection panel  34  is placed closer in the Y-axis direction to the second lighting source  42  compared with the other end of the shorter side of the four reflection panel  34 . The reflection surface  331  of the third reflection panel  33  and the reflection surface  341  of the fourth reflection panel  34  are faced to each other, and the reflection surface  331  and the reflection surface  341  reflect, to the first panel  22 , the light emitted from the lighting source  42 . In the reflection surface  341  of the fourth reflection panel  34 , for example, an angle against the reflection surface  331  of the third reflection panel  33  and a length of a width in the Y-axis direction of the reflection surface  341  of the fourth reflection panel  34  are adjusted so that the emitted light reaches, through the first panel  22 , as far as possible in the second direction X 2 . 
     The first light adjustment panel  35  is formed into a rectangular shape extended in the Z-axis direction. The both surfaces of the first light adjustment panel  35  are made to shielding surfaces  351  and  352 . In order to shield a part of the light emitted to the first direction X 1  side of the first panel  22 , the shielding surface  351  is colored with black to absorb the light as a light absorbing surface. The shielding surface  352  is colored with white to progress the higher reflectance compared with the shielding surface  351 . The first light adjustment panel  35  is placed between the reflection surface  311  of the first reflection panel  31  and the reflection surface  321  of the second reflection panel  32 . The first light adjustment panel  35  is placed near the first direction X 1  side of the middle in the X-axis direction of the first lighting source  41 . The first light adjustment panel  35  is placed within the case  2  so that the shielding surface  351  is faced up to the first lighting source  41 . The first light adjustment panel  35  is placed so that an end of a shorter side of the first light adjustment panel  35  is located at the first direction Y 1  side which is closer than an end in the second direction Y 2  of the second reflection panel  32 . The first light adjustment panel  35  is place to incline toward the second direction X 2  as a distance from the first lighting source  41  increases. The first light adjustment panel  35  is placed within the case  2  so that the end of the shorter side of the first light adjustment panel  35  is placed closer in the Y-axis direction to the first lighting source  41  compared with the other end of the shorter side of the first light adjustment panel  35 . 
     The second light adjustment panel  36  is formed into a rectangular shape extended in the Z-axis direction. The both surface of the second light adjustment panel  36  are made to shielding surfaces  361  and  362 . In order to shield a part of the light emitted to the first direction X 1  side of the first panel  22 , the shielding surface  361  is colored with black to absorb the light as a light absorbing surface. The shielding surface  362  is colored with white to progress the higher reflectance compared with the shielding surface  361 . The second light adjustment panel  36  is placed between the reflection surface  331  of the third reflection panel  33  and the reflection surface  341  of the fourth reflection panel  34 . The second light adjustment panel  36  is placed near the first direction X 1  side of the middle in the X-axis direction of the second lighting source  42 . The second light adjustment panel  36  is placed within the case  2  so that the shielding surface  361  is faced up to the second lighting source  42 . The second light adjustment panel  36  is placed so that an end of a shorter side of the second light adjustment panel  36  is located closer to the first direction Y 1  side than an end in the second direction Y 2  of the fourth reflection panel  34 . The second light adjustment panel  36  is placed to incline toward the second direction X 2  as a distance from the second lighting source  42  increases. The second light adjustment panel  36  is placed within the case  2  so that the end of the shorter side of the second light adjustment panel  36  is placed closer in the Y-axis direction to the second lighting source  42  compared with the other end of the shorter side of the second light adjustment panel  36 . 
     The shielding panel  37  is formed into a rectangular shape extended in the Z-axis direction and placed between the second reflection panel  32  and the third reflection panel  33 . The shielding panel  37  includes a shielding surface  371  shielding a part of the light emitted from the first lighting source  41  and a shielding surface  372  shielding a part of the light emitted from the second lighting source  42  at each of both surfaces respectably. The shielding surfaces  371  and  372  of the shielding panel  37  are colored with black to absorb the light as light absorbing surfaces. 
     Each of a pair of side panels  38  of the light adjuster  3 , as shown in  FIG. 5 ,  FIG. 6A , and  FIG. 6B , includes a pair of holding parts  381  formed into a rectangle board shape and a mounting part  382  formed for being bent perpendicular at the first direction Z 1  or the second direction Z 2  from the second direction Y 2  side of each of the pair of holding units  381 . Each of the pair of holding units  381 , as shown in  FIG. 3  and  FIG. 5 , includes slits to pass through and hold the each of both edges in the Z-axis direction of the first reflection panel  31 , the second reflection panel  32 , the third reflection panel  33 , the fourth reflection panel  34  (refer to  FIG. 1  and  FIG. 2 ). Also, each of the pair of holding parts  381  includes slits to pass through and hold the each of both edges in the Z-axis direction of the first light adjustment panel  35 , the second light adjustment panel  36 , and the shielding panel  37  (refer to  FIG. 1  and  FIG. 2 ). Each of the pair of the holding parts  381  is formed into a reflection surface so that surfaces faced to each other in the Z-axis direction reflect the light emitted from the lighting source  4 . The mounting part  382  is assembled to a surface of the first direction Y 1  side of the mounting panel  24  with screws. 
     As shown in  FIG. 6A  and  FIG. 6B , the middle panel  39  is formed into a rectangle board shape, and includes a pair of mounting chips  391  that both edges of the middle panel  39  in the X-axis direction is bent perpendicular to the first direction Z 1 . Each of the pair of mounting chips  391  is assembled to a surface of the first direction Y 1  side of the mounting panel  24  with screws. The middle panel  39  is placed between two first lighting sources  41  along to the Z-axis direction and between two second lighting sources  42  along to the Z-axis direction. The both surfaces of the middle panel  39  are formed into reflection surfaces. The middle panel  39  has slits to pass through the first reflection panel  31 , the second reflection panel  32 , the third reflection panel  33 , the fourth reflection panel  34 , the first light adjustment panel  35 , the second light adjustment panel  36 , and the shielding panel  37 . 
     Each of plural heat sinks  5 , as shown in  FIG. 3 , includes a base  51  formed into a rectangle board shape by a metal such as an aluminum, and plural radiating fins  52  formed into a rectangle board shape at a surface of the second direction Y 2  side of the base  51 . When the base  51  is mounted to the surface of the second direction Y 2  side of the mounting panel  24 , each of the plural heat sinks  5  dissipates heat generated from the lighting source  4 . 
     The stand holder  6 , as shown in  FIG. 1 , includes a box  61  containing such as a power source  611  and a controller  612 , and a pair of supporting panels  62 . The power source  611  converts from electrical power supplied from a commercial power supply to electrical power for supplying to the lighting source  4 . The controller  612  dims and arranges colors by adjusting electrical power supplying to the LEDs  412  and  422 . Each of the pair of supporting panels  62  is connected to the both edges of the box  61  in the Z-axis direction and holds the case  2  being able to change an angle of the case  2  with knob bolts  63 . 
     Note that, when the lighting device  1  is installed at a floor  101 , front, rear, left, right, top, and bottom are defined in  FIG. 1 . The Z-axis direction shown in  FIG. 1  is defined as the right-left direction, the first direction Z 1  points to the right, and the second direction Z 2  points to the left. Besides, a top-and-bottom direction and a front-and-rear directions are defined when the lighting device  1  is installed at the floor  101  in  FIG. 7  to  FIG. 9 . 
     Incidentally, the lighting device  1  of the present embodiment, as shown in  FIG. 7 , is installed on the floor  101  as an installation surface on which a wall surface (illuminated surface of the target  10 )  100  is installed. The lighting device  1  is installed on the floor  101  so that the Y-axis direction, which is same as optical axes OA 1  and OA 2 , crosses to a standing direction (the top-and-bottom direction) of the wall surface  100 . In other words, the front-and-rear direction&#39;s distance between the second lighting source  42  and wall surface  100  is shorter than the front-and-rear direction&#39;s distance between the first lighting source  41  and the wall surface  100 . Note that, the lighting device  1  may be installed at a predetermined location in the front-and-rear direction, and the angle of the optical axes OA 1  and OA 2  against the floor  101  may be changed by using knob bolts  63 . The standing direction is a direction which is along to the illuminated surface and crossing to the installation surface of the lighting device  1 . In other words, the standing direction is the direction which is along to the wall surface  100  and crossing to the floor  101  when the lighting device  1  is installed at the floor  101 . Moreover, when the lighting device  1  is installed at the ceiling, the standing direction is a direction which is along to the wall surface  100  and crossing to the ceiling. 
     Note that, as shown in  FIG. 7 , a dashed line I 1  represents an illumination curve I 1  when a lighting device includes none of the first light adjustment panel  35 , the second light adjustment panel  36 , or the shielding panel  37  (a comparative example). A distance between the wall surface  100  and the illumination curve I 1  represents an intensity of illuminance (an illuminance D 1 ). As shown in  FIG. 7 , a solid line I 2  represents an illumination curve I 2  when the lighting device  1  includes the first light adjustment panel  35 , the second light adjustment panel  36 , and the shielding panel  37  (the lighting device  1  of the present embodiment). The distance between the wall surface  100  and the illumination curve I 2  represents an intensity of illuminance (an illuminance D 2 ). 
     Here, paths of the light emitted from the first lighting source  41  and the second lighting source  42  are described.  FIG. 8  shows the paths of the light (of the present embodiment) when the lighting device  1  includes the first light adjustment panel  35 , the second light adjustment panel  36 , and the shielding panel  37 . As shown in  FIG. 8 , the shielding surface  351  of the first light adjustment panel  35  and the shielding surface  361  of the second light adjustment panel  36  are formed to have a low reflectance and absorb the light emitted from the lighting source  4 . Besides, the shielding surface  352  of the first light adjustment panel  35  and the shielding surface  362  of the second light adjustment panel  36  are formed to have a high reflectance and reflect the light emitted from the lighting source  4 .  FIG. 9  shows paths of the light (of the comparative example) when the lighting device includes none of the first light adjustment panel  35 , the second light adjustment panel  36 , or the shielding panel  37 . As shown in  FIG. 8  and  FIG. 9 , the optical axis OA 1  shows an optical axis of the lighting part  410  of the first lighting source  41 , and the optical axis OA 2  shows an optical axis of the lighting part  420  of the second lighting source  42 . 
     As shown in  FIG. 8 , along an optical path OP 1 , the light traveled to the direction inclining upward and pointing to the first light adjustment panel  35  from the LEDs  412  of the first lighting source  41  hits the shielding surface  351  of the first light adjustment panel  35 , and is shielded. Along an optical path OP 2 , the light traveled to the front direction from the LEDs  412  of the first lighting source  41  is reflected by the reflection surface  321  of the second reflection panel  32 , reflected by the shielding surface  352  of the first light adjustment panel  35 , and travels toward the first panel  22 . Along an optical path OP 3 , the light traveled to the direction inclining frontward and pointing to the shielding panel  37  from the LEDs  412  of the first lighting source  41  is shielded by the shielding surface  371  of the shielding panel  37 . 
     Along an optical path OP 4 , the light traveled to the direction inclining rearward and pointing to the first reflection panel  31  from the LEDs  412  of the first lighting source  41  is reflected by the reflection surface  311  of the first reflection panel  31  and travels toward the first panel  22 . Along an optical path OP 5 , the light traveled to the direction inclining upward from the LEDs  412  of the first lighting source  41  travels upward. 
     Along an optical path OP 6 , the light traveled to the direction inclining upward and pointing to the second light adjustment panel  36  from the LEDs  422  of the second lighting source  42  hits the shielding surface  361  of the second light adjustment panel  36 , and is shielded. Along an optical path OP 7 , the light traveled to the front direction from the LEDs  422  of the second lighting source  42  is reflected by the reflection surface  341  of the fourth reflection panel  34 , reflected by the shielding surface  362  of the second light adjustment panel  36 , and travels toward the first panel  22 . Along an optical path OP 8 , the light traveled to the direction inclining upward and pointing to the third reflection panel  33  from the LEDs  422  of the second lighting source  42  is reflected by the reflection surface  331  of the third reflection panel  33 , and shielded by the shielding surface  372  of the shielding panel  37 . Along an optical path OP 9 , the light traveled to the direction inclining rearward and pointing to the third reflection panel  33  from the LEDs  422  of the second lighting source  42  is reflected by the reflection surface  331  of the third reflection panel  33  and travels toward the first panel  22 . Along an optical path OP 10 , the light traveled upward from the LEDs  422  of the second lighting source  42  travels upward. 
     In a comparative example as shown in  FIG. 9 , comparing with the paths of the light as shown in  FIG. 8 , there exist more optical paths of the light emitted to the front side of the optical axes OA 1  and OA 2  from plural LEDs  412  of the first lighting source  41 . Besides, the intensity of an illumination at a place closer to the first lighting source  41  of the wall surface  100  is stronger by the light emitted from the first lighting source  41 . Moreover, in the comparative example, comparing with the paths of the light as shown in  FIG. 8 , there exist more the optical paths of the light emitted to front side of the optical axis OA 2  from the plural LEDs  422  of the second lighting source  42 . Further, the intensity of an illumination at a place closer to the second lighting source  42  of the wall surface  100  is stronger by the light emitted from the second lighting source  42 . In other words, as the illumination curve I 1  of the wall surface  100  by the first lighting source  41  and the second lighting source  42  in the comparative example, the intensity of an illumination D 1  at a lower part of the wall surface  100  is more likely to be stronger and the intensity of an illumination D 1  at higher part of the wall surface  100  is more likely to be weaker (refer to  FIG. 7 ). 
     Accordingly, in the lighting device  1  of the present embodiment, the shielding surface  351  of the first light adjustment panel  35 , as shown in  FIG. 8 , shields a part of the light emitted from the plural LEDs  412  of the first lighting source  41  to the front side (the first end side) of the optical axis OA 1 . The shielding surface  361  of the second light adjustment panel  36  shields a part of the light emitted from the plural LEDs  422  of the second lighting source  42  to the front side (the first end side) of the optical axis OA 2 . Besides, the shielding surfaces  371  and  372  of the shielding panel  37  shield a part of the light emitted to a lower part of the wall surface  100 . 
     Moreover, the shielding surface  352  of the first light adjustment panel  35  and the shielding surface  362  of the second light adjustment panel  36  reflect a part of the light emitted from the first lighting source  41  and the second lighting source  42 , and thus, when the lighting device  1  emits the light to the wall surface  100 , an irregular illumination on the wall surface  100  can be reduced. In other words, the shielding surface  352  of the first light adjustment panel  35  and the shielding surface  362  of the second light adjustment panel  36  are configured to reflect a part of the light emitted from the first lighting source  41  and the second lighting source  42 . A part of the light to illuminating the wall surface is reflected by the shielding surface  352  of the first light adjustment panel  35  and the shielding surface  362  of the second light adjustment panel  36 . Therefore, an irregular illumination of the wall surface  100  can be reduced. 
     As shown in the illumination curve I 2  of the lighting device  1  of the present embodiment, the intensity of the illumination D 2  of a lower side of the wall surface  100  (floor  101  side) is reduced by the shielding surface  351  of the first light adjustment panel  35 , the shielding surface  361  of the second light adjustment panel  36 , and the shielding panel  37 . Besides, the lighting device  1  emits light to the wall surface  100  so that an illuminance distribution of the wall surface  100  in the top-and-bottom direction is more uniform by the shielding surface  352  of the first light adjustment panel  35  and the shielding surface  362  of the second light adjustment panel  36 . In other words, the intensity of the illumination D 2  of the light emitted to the wall surface  100  becomes more uniform with the shielding surface  352  of the first light adjustment panel  35  and the shielding surface  362  of the second light adjustment panel  36 . Moreover, using the knob bolts  63 , the angle of the case  2  can be changed and the lighting device  1  is able to emit light in the top-and-bottom direction to a far place of the wall surface  100 , even if the lighting device  1  may be installed at a place different from the installation place shown in  FIG. 7  in the front-and-rear direction. 
     Note that, the lighting device  1  of the present embodiment may be installed at a ceiling instead of the floor  101  by, for example, being suspended. The lighting source  4  may include only one first lighting source  41  and only one second lighting source  42 . Further, the lighting source  4  may include three or more first lighting sources  41  and three or more second lighting sources  42 . Besides, shapes and constitutions of the circuit board  411  of the first lighting source  41  and the circuit board  421  of the second lighting source  42  are not limited to those of the present embodiment. 
     Widths of the top-and-bottom direction, shapes, and inclination angles of the first reflection panel  31 , the second reflection panel  32 , the third reflection panel  33 , and the fourth reflection panel  34  are not limited to those of the present embodiment. Also, widths of the top-and-bottom direction, shapes, and inclination angles of the first light adjustment panel  35 , the second light adjustment panel  36 , and the shielding panel  37  are not limited to those of the present embodiment. 
     The manner of settings of the reflectance of the shielding surfaces  351  and  352  of the first light adjustment panel  35  and the shielding surface  361  and  362  of the second light adjustment panel  36  are not limited to the manners of setting of the reflectance of the present embodiment. The lighting device  1  preferably includes the first light adjustment panel  35  in which the reflectance of the shielding surfaces  351  and  352  are set appropriately in accordance with a place and an environment of the installation. The lighting device  1  preferably includes the second light adjustment panel  36  in which the reflectance of the shielding surfaces  361  and  362  are adjusted appropriately in accordance with a place and an environment of the installation. The reflectance of the shielding surfaces  351  and  352  of the first light adjustment panel  35  and the shielding surfaces  361  and  362  of the second light adjustment panel  36  are not only adjusted by color of surfaces, but may be adjusted by processing the surfaces, such as a mirror surface processing. In additionally, the reflectance of the shielding surfaces  351  and  352  of the first light adjustment panel  35  and the shielding surfaces  361  and  362  of the second light adjustment panel  36  may be adjusted by processing the surfaces, such as a mirror surface processing, instead of being adjusted by color of surfaces. 
     The manners of adjustment of the reflectance of the shielding surfaces  371  and  372  of the shielding panel  37  are not limited to the manners of adjustment of the reflectance of the present embodiment. The lighting device  1  preferably includes the shielding panel  37  in which the reflectance of the shielding surfaces  371  and  372  are adjusted appropriately in accordance with a place and an environment of the installation. The reflectance of the shielding surfaces  371  and  372  of the shielding panel  37  are not only adjusted by color of surfaces, but may be adjusted by processing the surfaces, such as a mirror surface processing. In additionally, the reflectance of the shielding surfaces  371  and  372  of the shielding panel  37  may be adjusted by processing the surfaces, such as a mirror surface processing, instead of being adjusted by color of surfaces. 
     The materials and shapes of the heat sinks  5  are not limited to those of the present embodiment. 
     The lighting device  1  of the present embodiment emits light to the illuminated surface (wall surface  100 ) of the target  10  standing at the installation surface (floor  101 ) on which the lighting device  1  is installed. The lighting device  1  includes: the lighting source  4 ; the case  2  containing the lighting source  4 ; and the light adjuster  3  contained in the case  2  and adjusting a path of light emitted from the lighting source  4 . The lighting source  4  includes the first lighting source  41  and the second lighting source  42  aligned along the predetermined direction (X direction) in the case  2 . The second lighting source  42  is placed at a side of the first lighting source  41  at the predetermined side (X  1  side) of the predetermined direction (X direction). The light adjuster  3  includes the first reflection panel  31  and the second reflection panel  32  reflecting light emitted from the first lighting source  41 , and the third reflection panel  33  and the fourth reflection panel  34  reflecting light emitted from the second lighting source  42 . The light adjuster  3  further includes the first light adjustment panel  35  placed between the first reflection panel  31  and the second reflection panel  32 , and the second light adjustment panel  36  placed between the third reflection panel  33  and the fourth reflection panel  34 . Each of the reflection surface  311  of the first reflection panel  31  and the reflection surface  321  of the second reflection panel  32  are located facing each other in the predetermined direction (X direction). Each of the reflection surface  331  of the third reflection panel  33  and the reflection surface  341  of the fourth reflection panel  34  are located facing each other in the predetermined direction (X direction). The first light adjustment panel  35  is placed between the reflection surface  311  of the first reflection panel  31  and the reflection surface  321  of the second reflection panel  32 , and shields a part of the light emitted from the first lighting source  41  to the predetermined side (front side) of an optical axis OA 1  of the first lighting source  41 . The second light adjustment panel  36  is placed between the reflection surface  331  of the third reflection panel  33  and the reflection surface  341  of the fourth reflection panel  34 , and shields a part of the light emitted from the second lighting source  42  to the predetermined side of an optical axis OA 2  of the second lighting source  42 . 
     In other words, the lighting device  1  of the present embodiment emits light to the illuminated surface (wall surface)  100  of the target  10  standing at the installation surface (floor)  101  on which the lighting device  1  is installed. The lighting device  1  includes: the lighting source  4 ; the case  2  accommodating the lighting source  4 ; and the light adjuster  3  accommodated in the case  2  and adjusting a path of light emitted from the lighting source  4 . The lighting source  4  includes the first lighting source  41  and the second lighting source  42  aligned along the predetermined direction (X-axis direction) in the case  2 . The predetermined direction is the direction toward the second end of the case  2  from the first end of the case  2 , and the first end (the first direction) X 1  side is a side closer to the first end than the second end. The second lighting source  42  is placed at the first end (the first direction) X 1  side of the first lighting source  41  in the predetermined direction (X-axis direction). The light adjuster  3  includes the first reflection panel  31  and the second reflection panel  32  both reflecting light emitted from the first lighting source  41 , and the third reflection panel  33  and the fourth reflection panel  34  both reflecting light emitted from the second lighting source  42 . The light adjuster  3  further includes the first light adjustment panel  35  placed between the first reflection panel  31  and the second reflection panel  32 , and the second light adjustment panel  36  placed between the third reflection panel  33  and the fourth reflection panel  34 . The reflection surface  311  of the first reflection panel  31  and the reflection surface  321  of the second reflection panel  32  face each other in the predetermined direction (X-axis direction). The reflection surface  331  of the third reflection panel  33  and the reflection surface  341  of the fourth reflection panel  34  face each other in the predetermined direction (X-axis direction). The first light adjustment panel  35  is placed between the reflection surface  311  of the first reflection panel  31  and the reflection surface  321  of the second reflection panel  32 , and shields a part of the light, which is emitted from the first lighting source  41  to the first end (the first direction) X 1  side of the optical axis OA 1  of the first lighting source  41 . The second light adjustment panel  36  is placed between the reflection surface  331  of the third reflection panel  33  and the reflection surface  341  of the fourth reflection panel  34 , and shields a part of the light, which is emitted from the second lighting source  42  to the first end (the first direction) X 1  side of the optical axis OA 2  of the second lighting source  42 . 
     The lighting device  1  of the present embodiment is configured as described above, and therefore an irregular illumination to the illuminated surface (wall surface)  100  of the target  10  can be reduced. 
     In the lighting device  1  of the present embodiment, both surfaces of the first light adjustment panel  35  preferably are shielding surfaces  351  and  352  to shield light. Both surfaces of the second light adjustment panel  36  preferably are shielding surfaces  361  and  362  to shield light. 
     When the lighting device  1  of the present embodiment is configured as described above, the lighting device  1  can reduce the irregular illumination in the wall surface  100  while decreasing the light emitted to the part of the wall surface  100  closer to the floor  101 . 
     In the lighting device  1  of the present embodiment, the first light adjustment panel  35  is preferably placed so that the first surface (shielding surface)  351  faces to the first lighting source  41 . The first surface  351  of the first light adjustment panel  35  is preferably a light absorbing surface having the higher absorptance than the second surface (shielding surface)  352 , which is opposite to the first surface, of the first light adjustment panel  35 . The second surface  352  of the first light adjustment panel  35  is preferably the light reflecting surface having the higher reflectance than the first surface  351  of the first light adjustment panel  35 . The second light adjustment panel  36  is preferably placed so that the first surface (shielding surface)  361  faces to the second lighting source  42 . The first surface  361  of the second light adjustment panel  36  is the light absorbing surface having the higher absorptance than the second surface (shielding surface)  362 , which is opposite to the first surface, of the second light adjustment panel  36 . The second surface  362  of the second light adjustment panel  36  is preferably the light reflecting surface having the higher reflectance than the first surface  361  of the second light adjustment panel  36 . 
     The lighting device  1  of the present embodiment preferably further includes the shielding panel  37  placed between the second reflection panel  32  and the third reflection panel  33 . Both surfaces of the surfaces of the shielding panel  37  are the shielding surfaces  371  and  372  to shield light. 
     When the lighting device  1  of the present embodiment is configured as described above, the lighting device  1  can decrease the light illuminating the part of the wall surface  100  closer to the floor  101 . 
     In the lighting device  1  of the present embodiment, the predetermined direction (X direction) is preferably a direction that crosses to the standing-direction (top-and-bottom direction) of the target  10  (wall surface  100 ). 
     In other words, in the lighting device  1  of the present embodiment, the predetermined direction (X-axis direction) is preferably a direction that crosses to the standing-direction (top-and-bottom direction) of the target  10  which is a direction along to the illuminated surface (wall surface)  100  and crossing to the installation surface (floor)  101  when the lighting device  1  is installed at the installation surface (floor)  101 . 
     When the lighting device  1  of the present embodiment is configured as described above, the lighting device  1  can reduce the irregular illuminations of the wall surface  100 . 
     In the lighting device  1  of the present embodiment, each of the first lighting source  41  and the second lighting source  42  preferably includes plural LEDs  412  and  422  respectably. 
     When the lighting device  1  of the present embodiment is configured as described above, the lighting device  1  can emit the light with desired colors to the wall surface  100 . 
     The lighting device  1  of the present embodiment preferable further includes the power source  611  for supplying electrical power to the lighting source  4 , and the stand holder  6  containing the power source  611  and pivotally holding the case  2 . 
     When the lighting device  1  of the present embodiment is configured as described above, the lighting device  1  can emits the light to the place far along to the wall surface  100  from the installed place. 
     While the foregoing has described what are considered to be the best mode and/or other examples, it is understood that various modifications may be made therein and that the subject matter disclosed herein may be implemented in various forms and examples, and that they may be applied in numerous applications, only some of which have been described herein. It is intended by the following claims to claim any and all modifications and variations that fall within the true scope of the present teachings.