Lighting device

Abstract

This lighting device comprises: a first holding member that holds a light source; a second holding member including a rotary support that provides support so as enable rotation relative to the first holding member, a panel-holding cover that holds a liquid crystal panel, and a coupling unit that couples the rotary support and the panel-holding cover; a control board; and wiring that extends along a first direction and electrically connects the liquid crystal panel and the control board. The second holding member has a wiring support that supports a portion of the wiring.

Description

Technical Field

[0001] The present disclosure relates to a lighting device.

Background Art

[0002] A lighting device including a light source such as an LED is known (see, for example, Patent Documents 1 and 2). The lighting device of Patent Document 1 is an LED lamp including a base, an LED (light source), and a cylindrical member that connects the base and the LED. Since the cylindrical member has flexibility, the direction of the LED with respect to the base can be changed by bending and deforming the cylindrical member in the axial direction. The lighting device of Patent Document 2 is an LED bulb, and includes a base, an LED (light source), and a connecting member that connects the base and the LED. The connecting member can change the length in the axial center direction. Therefore, by changing the length of the connecting member to change the axial distance between the base and the LED, the light distribution angle of the lighting device is converted into an omnidirectional type or a downward type.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the shape (light distribution pattern) of the emitted light from the lighting device is not circular centered on the optical axis (for example, elongated in one direction), a lighting device capable of rotating the light distribution pattern centered on the axis is desired.

[0005] An object of the present disclosure is to provide a lighting device capable of rotating the light distribution pattern centered on the axis.

Means for Solving the Problems

[0006] A lighting device according to one aspect of the present disclosure includes a light source, a liquid crystal panel disposed on one side of the light source in a first direction, a first holding member having a central axis extending in the first direction and holding the light source, a second holding member including a rotating support portion provided on the outer circumference of the first holding member and supporting the first holding member so as to be rotatable in the circumferential direction about the axis of the central axis, a panel holding cover for holding the liquid crystal panel, and a connecting portion connecting the rotating support portion and the panel holding cover, a control board disposed on the other side of the first direction with respect to the first holding member and for controlling the liquid crystal panel, and wiring extending along the first direction and electrically connecting the liquid crystal panel and the control board, wherein the second holding member has a wiring support portion that supports a part of the wiring. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic perspective view of a lighting device according to the first embodiment. [Figure 2] Figure 2 is an exploded perspective view of Figure 1. [Figure 3] Figure 3 is a schematic cross-sectional view taken along the line III-III in Figure 1. [Figure 4] Figure 4 is a schematic cross-sectional view taken along the line IV-IV in Figure 1. [Figure 5] Figure 5 is a schematic diagram of a liquid crystal panel viewed from the front. [Figure 6] Figure 6 is a schematic diagram showing the surface of the first substrate included in the liquid crystal panel. [Figure 7] Figure 7 is a schematic diagram showing the surface of the second substrate included in the liquid crystal panel, which is the side on which the wiring is provided, when the substrate is turned over. [Figure 8] Figure 8 is a cross-sectional view taken along line VIII-VIII in Figure 6. [Figure 9A] Figure 9A is a schematic front view of a portion of Figure 4, seen from the D1 side. [Figure 9B] Figure 9B is a schematic cross-sectional view taken along the IXB-IXB line in Figure 9A. [Figure 9C]Figure 9C is a schematic rear view of Figure 9B as seen from the D2 side. [Figure 10A] Figure 10A is a schematic front view of a portion of Figure 4, seen from the D1 side, showing the liquid crystal panel and the second holding member rotated 45 degrees relative to Figure 9A. [Figure 10B] Figure 10B is a schematic cross-sectional view of Figure 10A taken along the XB-XB line. [Figure 10C] Figure 10C is a schematic rear view of Figure 10B as seen from the D2 side. [Figure 11] Figure 11 is a schematic diagram showing an example of a light distribution pattern. [Figure 12] Figure 12 is a schematic diagram showing a part of the lighting device according to the second embodiment. [Figure 13] Figure 13 is a schematic diagram showing the relay connector in Figure 12. [Modes for carrying out the invention]

[0008] Embodiments for implementing this disclosure will be described in detail with reference to the drawings. This disclosure is not limited to the embodiments described below. Furthermore, the components described below include those that are easily conceivable to those skilled in the art, and those that are substantially the same. In addition, the components described below can be combined as appropriate.

[0009] Furthermore, the disclosure is merely an example, and any modifications that a person skilled in the art could easily conceive of while maintaining the intent of the disclosure are naturally included within the scope of this disclosure. In addition, drawings may schematically represent the width, thickness, shape, etc. of each part in order to clarify the explanation, but these are merely examples and do not limit the interpretation of this disclosure. Moreover, in this specification and each drawing, elements similar to those described above in previously shown drawings are denoted by the same reference numerals, and detailed explanations may be omitted as appropriate.

[0010] [First Embodiment] First, the structure of the lighting device according to the first embodiment will be described. FIG. 1 is a schematic perspective view of the lighting device according to the first embodiment. FIG. 2 is an exploded perspective view of FIG. 1. FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 1. FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG. 1.

[0011] As shown in FIGS. 1 to 4, the lighting device 100 includes an optical element 1A, a reflector 3, an LED (light source) 4, a first holding member 6, a second holding member 2, a control board 8, and a flexible printed board (wiring) 400. The lighting device 100 has a central axis AX. The central axis AX extends in the axial direction. Note that the axial direction is also referred to as the D direction or the first direction, one side of the axial direction is the D1 side (one side of the first direction), and the other side of the axial direction is the D2 side (the other side of the first direction).

[0012] The optical element 1A includes a plurality of liquid crystal panels 1. The liquid crystal panel 1 is in a thin flat plate shape, and for example, four liquid crystal panels 1 overlap in the axial direction. That is, the optical element 1A according to the present embodiment includes four liquid crystal panels 1 overlapping in the axial direction. The number of liquid crystal panels 1 is not particularly limited. The plurality of liquid crystal panels 1 are laminated alternately in the axial direction with a liquid crystal panel 1 for p-wave polarization and a liquid crystal panel 1 for s-wave polarization. The configuration of the liquid crystal panel 1 will be described in detail later. Also, the LED (Light Emitting Diode) 4 is a light emitting diode and is a kind of light source. Note that various light sources other than LEDs can also be applied.

[0013] As shown in FIG. 4, the second holding member 2 is a housing that covers the front portion of the lighting device 100 shown in FIG. 1, and includes a connecting portion 21, a panel holding cover 22, and a first convex portion (rotation support portion, fitting portion) 28. The panel holding cover 22 is a cover body that constitutes the front surface of the lighting device 100 and is located on the D1 side, which is one side in the axial direction, with respect to the connecting portion 21. The panel holding cover 22 has a holding piece 26 on the D1 side. The inner peripheral side of the holding piece 26 is an opening 25. The panel holding cover 22 has a claw portion 23 on the D2 side. A plurality of claw portions 23 are provided along the circumferential direction around the central axis AX.

[0014] The connecting portion 21 has a support member 24 at the D1 end and a first protrusion 28 at the D2 end. The support member 24 rises radially inward. A fitting groove 27 is provided on the radially outer part of the support member 24. The panel holding cover 22 is attached to the connecting portion 21 by fitting the claw portion 23 of the cylindrical body into the fitting groove 27. The outer peripheral end 140 of the optical element 1A is sandwiched between the support member 24 and the holding piece 26. This attaches the optical element 1A to the second holding member 2. The second holding member 2 is rotatably attached relative to the first holding member 6 by fitting the first protrusion 28 of the connecting portion 21 into the second protrusion 722 of the first holding member 6. The first holding member 6 will be described in detail later.

[0015] As shown in Figure 4, the first protrusion 28 is located on the outer circumference side of the annular member 72 of the first retaining member 6. The first protrusion 28 has a triangular cross-sectional shape that protrudes radially inward. The first protrusion 28 has inclined surfaces 28a and 28b. The inclined surface 28a is directed radially inward as it approaches the D2 side, and the inclined surface 28b is directed radially outward as it approaches the D2 side.

[0016] As shown in Figures 1 and 2, multiple second protrusions 722 of the first retaining member 6 are provided on the annular member 72. The multiple second protrusions 722 are spaced apart in the circumferential direction around the axis of the central axis AX. As will be described later, the second protrusions 722 elastically deform radially around the base portion attached to the annular body 721. As shown in Figure 4, the second protrusions 722 have a triangular cross-sectional shape that protrudes radially outward. The second protrusions 722 have inclined surfaces 722a and 722b. The inclined surface 722a is directed radially outward as it approaches D2, and the inclined surface 722b is directed radially inward as it approaches D2. The inclined surface 28a of the first protrusion 28 slides against the inclined surface 722b of the second protrusion 722. In this way, the first protrusion 28 is a rotatable support portion that rotatably supports the second retaining member 2 with respect to the first retaining member 6.

[0017] Furthermore, as shown in Figures 1 and 2, a projection 724 protrudes radially outward from the outer circumferential surface of the annular member 72. The projection 724 is positioned on the D2 side relative to the second protrusion 722. Therefore, as shown in Figure 4, the first protrusion 28 and end portion 29 of the second retaining member 2 (see Figures 4, 9B, and 10B) fit between the second protrusion 722 and the projection 724. That is, the first protrusion 28 of the second retaining member 2 fits on the D2 side of the second protrusion 722 of the first retaining member 6, and the end portion 29 fits on the D1 side of the projection 724. In this way, the first protrusion 28 and end portion 29 of the second retaining member 2 are fitting portions, and the second protrusion 722 and projection 724 of the first retaining member 6 are fitted portions.

[0018] As shown in Figures 1 to 4, the reflector 3 comprises a main body 31, a flange 32, and a projection 33. The reflector 3 is located on the D1 side relative to the LED 4. The main body 31 is cylindrical. Specifically, the main body 31 has a cylindrical shape in which the diameter increases from end 31a to end 31b towards the D1 side. At end 31b, the flange 32 extends radially outward. A projection 33 is provided at end 31a of the main body 31. The projection 33 protrudes radially outward. The projection 33 fits into a groove 56 of the outer annular portion 52 of the mounting member 5. In this way, the reflector 3 is attached to the mounting member 5. The reflector 3 is a reflector that reflects light from the light source LED 4 and guides the light to the liquid crystal panel 1 while reflecting it.

[0019] As shown in Figure 2, the first retaining member 6 comprises a mounting member 5, a heat sink 60, a disc member 71, an annular member 72, and a plurality of elongated members 73.

[0020] As shown in Figures 1 to 4, the mounting member 5 comprises an inner annular portion 51, an outer annular portion 52, and a connecting portion 54. The mounting member 5 is fastened to the D1 end of the elongated member 73 via bolts. The inner annular portion 51 is located on the D2 side of the mounting member 5, and the outer annular portion 52 is located on the D1 side of the mounting member 5. The inner annular portion 51 is integrated with the outer annular portion 52 via the connecting portion 54. The outer annular portion 52 is provided with a projection 53 that protrudes radially outward. The projection 53 is provided with a through hole 55. The inner annular portion 51 and the outer annular portion 52 are spaced apart in the axial direction. Therefore, after inserting the projection 33 of the reflector 3 into the groove 56 of the mounting member 5, the reflector 3 is rotated so that the projection 33 fits between the inner annular portion 51 and the outer annular portion 52, and the reflector 3 is attached to the mounting member 5 as described above. A reflector 3 is positioned on the D1 side of the mounting member 5, and an LED 4 is positioned on the D2 side of the mounting member 5. In other words, the mounting member 5 is positioned between the LED 4 and the reflector 3 in the axial direction.

[0021] LED4 is positioned on the D1 side relative to the heatsink 60. LED4 is positioned between the mounting member 5 and the heatsink 60. Specifically, it is held in place by being sandwiched between the mounting member 5 and the heatsink 60. LED4 is cooled by the heatsink 60.

[0022] The heat sink 60 is positioned on the D2 side relative to the mounting member 5. The heat sink 60 extends in the axial direction. The heat sink 60 comprises a main body 61 and fins 62. The heat sink 60 is made of, for example, metal. The main body 61 is a cylindrical body that extends in the axial direction from axial end 66 to axial end 67. The axial end 66 abuts against the LED 4. The fins 62 are provided on the outer circumferential surface 64 of the main body 61. The fins 62 protrude radially outward from the outer circumferential surface 64 of the main body 61. The fins 62 extend along the axial direction (first direction). Multiple fins 62 are arranged at equal intervals along the circumferential direction around the entire circumference of the outer circumferential surface 64 of the main body 61.

[0023] As shown in Figure 2, the fin 62 includes a first fin 62A and a second fin 62B. The first fin 62A has a first height H1 from the outer circumferential surface of the main body 61. The second fin 62B has a second height H2 from the outer circumferential surface of the main body 61. The second height H2 is lower than the first height H1. The elongated member 73 is positioned radially outward of the second fin 62B.

[0024] The disc member 71 is provided with through holes 714, 711, grooves 712, and 713. The through holes 714 are provided in pairs on the radially inward side of the disc member 71. The through holes 714 of the disc member 71 correspond to the bolt holes 68 of the heat sink 60. The disc member 71 is attached to the axial end 67 of the heat sink 60 by inserting bolts into the through holes 714 and bolt holes 68 and fastening them. The annular member 72 is provided on the outer circumference of the heat sink 60 and extends along the circumferential direction of the heat sink 60. The annular member 72 is ring-shaped (circular in shape) and extends in the circumferential direction around the central axis AX.

[0025] Four elongated members 73 are assembled inside the annular member 72. Each elongated member 73 extends in the axial direction. The elongated members 73 extend axially on the outside of the heat sink 60. Bolt holes 735 are provided at the axial end 733 on the D1 side of the elongated member 73, and bolt holes are provided at the axial end 734 on the D2 side of the elongated member 73. Multiple wall portions 736 are arranged at equal intervals in the axial direction on the radially outer side of the elongated member 73. Between two axially adjacent wall portions 736, a recess 732 is provided that is recessed radially inward from the outer peripheral surface 731.

[0026] The annular member 72 comprises an annular body 721, the aforementioned second protrusion 722, and a projection 724. The annular body 721 is provided in an annular shape along the circumferential direction of the central axis AX. The inner circumferential surface of the annular body 721 abuts against the radially outer end 65 of the fin 62. The second protrusion 722 projects toward the D1 side from the D1 side end face of the annular body 721. The second protrusion 722 elastically deforms radially around the base portion attached to the annular body 721. That is, when a force directed radially inward is applied to the second protrusion 722, the second protrusion 722 deforms radially inward, and when the force applied to the second protrusion 722 is removed, the second protrusion 722 returns to its original position. The projection 723 extends in the axial direction. The projection 723 is aligned circumferentially with respect to the second protrusion 722. The protruding portion 723 has a reinforcing function for the annular body 721.

[0027] The projection 725 protrudes radially inward from the inner circumferential surface of the annular body 721. Here, as shown in Figure 3, the projection 725 fits into the recess 732 of the elongated member 73. In other words, the projection 725 abuts against the wall surfaces of the pair of wall portions 736 of the elongated member 73 and fits onto the outside. This positions the annular member 72 axially relative to the elongated member 73. Also, as shown in Figure 2, predetermined recesses among the plurality of recesses 732 are designated as the first recess 732A and the second recess 732B. The second recess 732B is located on the D2 side of the first recess 732A. Furthermore, the distance along the axial direction between the LED 4 and the liquid crystal panel 1 when the projection 725 is fitted into the first recess 732A is defined as the first distance. The distance along the axial direction between the LED 4 and the liquid crystal panel 1 when the projection 725 is fitted into the second recess 732B is defined as the second distance. The first distance is greater than the second distance. Furthermore, as shown by the dashed line in Figure 3, a configuration in which the bottom of the recess 732 is penetrated to form a through hole 736a can also be adopted.

[0028] Furthermore, the bolt hole 735 provided at the axial end 733 on the D1 side of the elongated member 73 corresponds to the through hole 55 of the protruding portion 53 of the mounting member 5. After aligning the bolt hole 735 and the through hole 55, the mounting member 5 is fastened to the elongated member 73 by inserting bolts into the bolt hole 735 and the through hole 55 and tightening them. The axial end 734, which is the D2 side end of the elongated member 73, fits into the groove 712 of the disc member 71. The disc member 71 is fastened to the elongated member 73 by inserting bolts into the bolt holes of the through hole 713 and the axial end 734 and tightening them. As a result, the axial relative position of the elongated member 73 with respect to the heat sink 60 is fixed.

[0029] The control board 8 is positioned on the D2 side relative to the first holding member 6. The control board 8 comprises a substrate 81 and a substrate 82. Both substrates 81 and 82 have a disc shape. Substrate 82 is located on the D1 side of substrate 81. Substrates 81 and 82 are connected via three spacers 83. Three spacers 84 are attached to substrate 82 on the D1 side. The substrate 82 is attached to the disc member 71 by inserting and fitting the D1-side tips of the spacers 84 into the through holes 711 of the disc member 71. Substrates 81 and 82 may be treated as a single integrated component. Substrate 81 controls the entire lighting device 100. Substrate 82 controls the liquid crystal panel 1. That is, as shown in Figure 4, the liquid crystal panel 1 and the substrate 82 are electrically connected via a flexible printed circuit board 400, and when a voltage is applied to the liquid crystal panel 1, the orientation of the liquid crystal molecules changes, changing the optical properties of the liquid crystal panel 1. The flexible printed circuit board 400 will be described in detail later.

[0030] Next, the configuration of the liquid crystal panel 1 will be described. Figure 5 is a schematic diagram of the liquid crystal panel viewed from the front. Figure 6 is a schematic diagram showing the surface of the first substrate included in the liquid crystal panel. Figure 7 is a schematic diagram showing the surface of the second substrate included in the liquid crystal panel, which is the side on which the wiring is provided, when it is turned over. Figure 8 is a cross-sectional view taken along line VIII-VIII in Figure 6. The front side of the liquid crystal panel 1 is one side in the axial direction (D1 side, one side in the first direction), and the back side of the liquid crystal panel 1 is the other side in the axial direction (D2 side, the other side in the first direction). In the XYZ coordinate system shown in Figures 5 to 8, the X direction is perpendicular to the Y direction. The X1 side is opposite to the X2 side, and the Y1 side is opposite to the Y2 side. The Z direction is perpendicular to the X and Y directions. The Z1 side is opposite to the Z2 side. The Z direction coincides with the axial direction, the D direction, or the first direction. The Z1 side is the D1 side, and the Z2 side is the D2 side.

[0031] As shown in Figure 5, the liquid crystal panel 1 comprises a first substrate 2A and a second substrate 3A positioned on the Z1 side of the first substrate 2A. The liquid crystal panel 1 is a regular octagon in plan view and has a first side 11, a second side 12, a third side 13, a fourth side 14, a fifth side 15, a sixth side 16, a seventh side 17, and an eighth side 18. In the present invention, the external shape of the liquid crystal panel 1 is not particularly limited, and polygons other than octagons, as well as circles and ellipses, are also included in the present invention. In this embodiment, the liquid crystal panels 1 stacked in the Z direction (axial direction) are four liquid crystal panels 1, each with the same configuration. However, two adjacent liquid crystal panels 1 in the Z direction (axial direction) are stacked in a state where they are rotated 90 degrees relative to each other around the central axis AX, which is the central part. In other words, the four liquid crystal panels 1 are stacked in the Z direction (axial direction) in the order of a liquid crystal panel for p-wave polarization, a liquid crystal panel for s-wave polarization, a liquid crystal panel for p-wave polarization, and a liquid crystal panel for s-wave polarization.

[0032] The first side 11 is located on the Y1 side of the liquid crystal panel 1. The first side 11 is parallel to the X direction in the figure. The first side 11 of the liquid crystal panel 1 coincides with the first side 211 of the first substrate 2A shown in Figure 6. In contrast, the first side 311 of the second substrate 3A shown in Figure 7 is located on the Y2 side of the first side 211 of the first substrate 2A. Therefore, as shown in Figure 6, when the second substrate 3A is laminated on the front side of the first substrate 2A, the Y1 side end 2Ac of the first substrate 2A is exposed. The first group of terminals 10 is provided on the end 2Ac.

[0033] The second side 12 is located on the X1 side of the liquid crystal panel 1. The second side 12 is parallel to the Y direction in the figure. The second side 12 of the liquid crystal panel 1 coincides with the second side 212 of the first substrate 2A shown in Figure 6. In contrast, the second side 312 of the second substrate 3A shown in Figure 7 is located on the X2 side than the second side 212 of the first substrate 2A. Therefore, as shown in Figure 5, when the second substrate 3A is laminated on the front side of the first substrate 2A, the X1 side end 2Ad of the first substrate 2A is exposed. The second group of terminals 20 is provided at the end 2Ad.

[0034] The third side 13 intersects both the X1 and Y1 directions. The intersection angle is 45 degrees. The third side 13 coincides with the third side 213 of the first substrate 2A shown in Figure 6. In contrast, the third side 313 of the second substrate 3A shown in Figure 7 is located X2 and Y2 closer to the third side 213 of the first substrate 2A. In other words, in a plan view, the third side 313 of the second substrate 3A is located closer to the center than the third side 213 of the first substrate 2A. Therefore, as shown in Figure 5, when the second substrate 3A is laminated on the front side of the first substrate 2A, the edge 2Ae of the first substrate 2A is exposed.

[0035] The fourth side 14 intersects both the X1 and Y2 directions. The intersection angle is 45 degrees. The fourth side 14 overlaps with the fourth side 214 of the first substrate 2A shown in Figure 6 and the fourth side 314 of the second substrate 3A shown in Figure 7.

[0036] The fifth side 15 is located on the Y2 side of the liquid crystal panel 1. The fifth side 15 overlaps with the fifth side 215 of the first substrate 2A shown in Figure 6 and the fifth side 315 of the second substrate 3A shown in Figure 8.

[0037] The sixth side 16 intersects in both the X2 and Y2 directions. The intersection angle is 45 degrees. The sixth side 164 overlaps with the sixth side 216 of the first substrate 2A shown in Figure 6 and the sixth side 316 of the second substrate 3A shown in Figure 7.

[0038] The seventh side 17 is located on the X2 side of the liquid crystal panel 1. The seventh side 17 overlaps with the seventh side 217 of the first substrate 2A shown in Figure 6 and the seventh side 317 of the second substrate 3A shown in Figure 7.

[0039] The eighth side 18 intersects both the X2 and Y1 directions. The intersection angle is 45 degrees. The eighth side 18 overlaps with the eighth side 218 of the first substrate 2A shown in Figure 6 and the eighth side 318 of the second substrate 3A shown in Figure 7.

[0040] Thus, since the area of ​​the second substrate 3A is smaller than the area of ​​the first substrate 2A, the first terminal group 10 provided at the end 2Ac of the first substrate 2A and the second terminal group 20 provided at the end 2Ad are exposed. The first terminal group 10 or the second terminal group 20 are electrically connected to the flexible printed circuit board 400.

[0041] Next, the first substrate 2A and the second substrate 3A will be described with reference to Figures 6 and 7. Figure 7 is a schematic diagram showing the front surface 3Aa of the second substrate 3A, which is the side on which the wiring is provided. Therefore, the orientations of X1 and X2 in the second substrate 3A in Figure 7 are opposite to the orientations of X1 and X2 in the first substrate 2A in Figure 6. Figure 6 shows a center line CL1 that passes through the center of the first substrate 2A in the X direction and extends in the Y direction, and a center line CL2 that passes through the center of the first substrate 2A in the Y direction and extends in the X direction.

[0042] As shown in Figure 6, at the end portion 2Ac of the first substrate 2A along the first side 211, the first terminal group 10 is provided at the first end portion 21A (shown by the dashed line) that is on the second side 212 (or third side 213) side of the center of the first side 211. That is, the end portion 2Ac is the Y1 side end of the first substrate 2A, and the first end portion 21A, shown by the dashed line, is located on the X1 side of the center line CL1 within the portion of the end portion 2Ac. The first terminal group 10 is provided at the first end portion 21A. As shown in Figure 6, the first terminal group 10 includes the first terminal 101, the second terminal 102, the third terminal 103, and the fourth terminal 104. The first terminal 101, the second terminal 102, the third terminal 103, and the fourth terminal 104 are arranged in order in the X direction from the X1 side to the X2 side. These terminals 101, 102, 103, and 104 are provided with a pair of short sides 105 parallel to the first side 211 and a pair of long sides 106 parallel to the second side 212.

[0043] Furthermore, as shown in Figure 6, at the end 2Ad of the first substrate 2A along the second side 212, a second terminal group 20 is provided at the second end 22A (indicated by the dashed line) which is on the side of the first side 211 (or the side of the third side 213) of the center of the second side 212. That is, end 2Ad is the X1 side end of the first substrate 2A, and the second end 22A, indicated by the dashed line, is located on the Y1 side of the center line CL2 within the portion of end 2Ad. The second terminal group 20 is provided at the second end 22A. As shown in Figure 6, the second terminal group 20 includes the fifth terminal 201, the sixth terminal 202, the seventh terminal 203, and the eighth terminal 204. The fifth terminal 201, the sixth terminal 202, the seventh terminal 203, and the eighth terminal 204 are arranged in order in the front-to-back direction (Y direction) from the Y1 side to the Y2 side. These terminals 201, 202, 203, and 204 are provided with a pair of long sides 107 parallel to the first side 211 and a pair of short sides 108 parallel to the second side 212.

[0044] Next, the wiring of the first substrate 2A and the second substrate 3A will be described. Note that the wiring is provided on the front surface of the substrate, which is one of the two surfaces of the substrate. That is, the surface on which the wiring is provided is called the front surface, and the surface opposite the front surface is called the back surface.

[0045] As shown in Figure 6, the surface 2Aa of the first substrate 2A is provided with wiring, liquid crystal driving electrodes, and connection parts. The connection part C1 of the first substrate 2A and the connection part C3 of the second substrate 3A (see Figure 7) are electrically connected via conductive pillars (not shown). Similarly, the connection part C2 of the first substrate 2A and the connection part C4 of the second substrate 3A (see Figure 7) are electrically connected via conductive common electrodes (not shown).

[0046] The first terminal 101 and the fifth terminal 201 are electrically connected via wiring 241. A branch point 242 is provided in the middle of wiring 241, and the wiring extends from branch point 242 to connection point C1.

[0047] The second terminal 102 and the sixth terminal 202 are electrically connected via wires 243 and 245. Wire 243 has a branch point 244, and wire 246 extends from branch point 244 to end 247.

[0048] The third terminal 103 and the seventh terminal 203 are electrically connected via wiring 248. The fourth terminal 104 and the eighth terminal 204 are electrically connected via wirings 249 and 251. Wiring 249 extends from the fourth terminal 104 toward the X2 side to branch point 250. Wiring 251 extends from branch point 250 toward the eighth terminal 204. Wiring extends from branch point 250 toward connection point C2.

[0049] Multiple liquid crystal drive electrodes 261 are connected to wirings 243 and 246. The liquid crystal drive electrodes 261 extend linearly along the X direction. The liquid crystal drive electrodes 261 are arranged at equal intervals in the Y direction.

[0050] Multiple liquid crystal drive electrodes 262 are connected to wiring 248. The liquid crystal drive electrodes 262 extend linearly along the X direction. The liquid crystal drive electrodes 262 are arranged at equal intervals in the Y direction. The liquid crystal drive electrodes 261 and 262 are arranged alternately in the Y direction.

[0051] As shown in Figure 7, the surface 3Aa of the second substrate 3A is provided with wiring, liquid crystal driving electrodes, and connection parts. The center lines CL1 and CL2 shown in Figure 7 correspond to the center lines CL1 and CL2 shown in Figure 6.

[0052] Connection C3 is connected to wirings 342 and 343 via branch point 341. Wiring 342 extends to end 348. Wiring 343 extends to end 349. Connection C4 is connected to wirings 345 and 346 via branch point 344. Wiring 346 extends to end 347.

[0053] Multiple liquid crystal drive electrodes 361 are connected to wirings 342 and 343. The liquid crystal drive electrodes 361 extend linearly along the Y direction. The liquid crystal drive electrodes 361 are arranged at equal intervals in the X direction.

[0054] Multiple liquid crystal drive electrodes 362 are connected to wiring 346. The liquid crystal drive electrodes 362 extend linearly along the Y direction. The liquid crystal drive electrodes 362 are arranged at equal intervals in the X direction. The liquid crystal drive electrodes 361 and 362 are arranged alternately in the X direction.

[0055] Next, the cross-sectional structure of the liquid crystal panel 1 will be briefly described. As shown in Figure 8, the liquid crystal panel 1 comprises a first substrate 2A, a second substrate 3A, and a liquid crystal layer 4A. As shown in Figure 8, the second substrate 3A is positioned on the front side (Z1 side) of the first substrate 2A. The liquid crystal layer 4A is provided between the second substrate 3A and the first substrate 2A. That is, the surface 2Aa of the first substrate 2A and the surface 3Aa of the second substrate 3A are positioned opposite each other with the liquid crystal layer 4A in between. The opposite side of the surface 2Aa of the first substrate 2A is the back surface 2Ab, and the opposite side of the surface 3Aa of the second substrate 3A is the back surface 3Ab. Also, as mentioned above, since the area of ​​the second substrate 3A is smaller than that of the first substrate 2A, the third terminal 103 provided on the surface 2Aa of the first substrate 2A is exposed. Although an insulating layer is provided to prevent contact between two wires, in the liquid crystal panel 1 according to this embodiment, there is no overlapping portion of the wiring on the first substrate 2A, so no insulating layer is provided.

[0056] Furthermore, as shown in Figure 8, alignment films 610 are laminated on both substrates and electrodes. Specifically, the alignment film 610 is laminated on the surface 2Aa of the first substrate 2A, on the upper surface of the liquid crystal driving electrodes 261 and 262, and on a portion of the wiring 248. The alignment film 610 is also laminated on the surface 3Aa of the second substrate 3A and on the upper surface of the liquid crystal driving electrode 361. The first substrate 2A and the second substrate 3A are bonded together by a seal 600 that surrounds the effective area, and the liquid crystal layer 4A is filled into the space formed by the seal 600.

[0057] Next, the operation of the liquid crystal panel 1 will be briefly explained. For example, by applying a voltage to the liquid crystal panel 1, the orientation of the liquid crystal molecules in the liquid crystal layer 4A shown in Figure 8 changes, the refractive index distribution changes, and transmitted light is transmitted. Also, in Figure 6, by passing a current through the liquid crystal driving electrodes 261 and 262 extending in the X direction and creating a potential difference between the liquid crystal driving electrodes 261 and 262, light is diffused in the Y direction. In Figure 7, by passing a current through the liquid crystal driving electrodes 361 and 362 extending in the Y direction and creating a potential difference between the liquid crystal driving electrodes 361 and 362, light is diffused in the X direction. By creating a potential difference between the liquid crystal driving electrodes 261 and 262 and the liquid crystal driving electrodes 361 and 362, light is diffused in both the X and Y directions. Note that by increasing or decreasing the potential difference between the liquid crystal driving electrodes 261 and 262, the degree of light diffusion in the Y direction relative to the X direction can be changed. Furthermore, by increasing or decreasing the potential difference between the liquid crystal driving electrode 361 and the liquid crystal driving electrode 362, the degree of light diffusion in the X direction relative to the Y direction can be changed. As a result, with the optical element 1A formed by stacking liquid crystal panels, it is possible to form a light distribution state that is elongated in the X direction or elongated in the Y direction, and it is also possible to form an elliptical light distribution state that is elongated in the X direction or Y direction.

[0058] Figure 9A is a schematic front view of a portion of Figure 4, viewed from the D1 side. Figure 9B is a schematic cross-sectional view of Figure 9A along the line IXB-IXB. Figure 9C is a schematic rear view of Figure 9B, viewed from the D2 side. Figure 10A is a schematic front view of a portion of Figure 4, viewed from the D1 side, showing the liquid crystal panel and the second holding member 2 rotated 45 degrees relative to Figure 9A. Figure 10B is a schematic cross-sectional view of Figure 10A along the line XB-XB. Figure 10C is a schematic rear view of Figure 10B, viewed from the D2 side. Figures 9A to 10C show a portion of Figure 4. Specifically, Figures 9A to 10C show the liquid crystal panel 1 closest to D2 among the four liquid crystal panels 1, the second holding member 2, and the substrate 82. The liquid crystal panel 1 and the second holding member 2 rotate together, while the substrate 82 does not rotate. In other words, the liquid crystal panel 1 and the second holding member 2 rotate relative to the substrate 82.

[0059] Figures 9A to 9C show the state before the liquid crystal panel 1 and the second holding member 2 rotate, and Figures 10A to 10C show the state after the liquid crystal panel 1 and the second holding member 2 rotate. First, we will explain the state before the liquid crystal panel 1 and the second holding member 2 rotate.

[0060] As shown in Figure 9B, a wiring support portion 410 is provided on the inner surface of the connecting portion 21 of the second holding member 2 to support a part of the flexible printed circuit board 400. Specifically, as shown in Figure 9C, the wiring support portion 410 is an insertion portion 420 having a through hole that penetrates in the axial direction (first direction). When viewed from the axial direction, the insertion portion 420 has a flattened shape that follows the inner surface of the connecting portion 21. The flexible printed circuit board 400 passes through the through hole on the inside of the insertion portion 420.

[0061] In other words, as shown in Figure 9B, the insertion portion 420 is a cylindrical body extending in the axial direction (first direction). A V-shaped notch groove 413 is provided on the D1 side of the insertion portion 420.

[0062] Furthermore, as shown in Figure 9B, a first protrusion 28 is erected on the D2 side relative to the insertion portion 420, extending in the radial direction. The first protrusion 28 extends along the circumferential direction. A notch 421 is provided in a part of the first protrusion 28 in the circumferential direction, through which the flexible printed circuit board 400 can pass. Viewed from the axial direction, the notch 421 and the insertion portion 420 overlap. A guide portion 422 is erected at the end of the first protrusion 28 facing the notch 421. Two guide portions 422 are provided in each notch 421. The height of each of the two guide portions 422 gradually decreases as it moves towards the D1 side. The first protrusion 28 is continuously connected between two adjacent notches 421 in the circumferential direction. The circumferential length of the first protrusion 28 is at least long enough for the second holding member 2 to rotate 45 degrees. In other words, as described above, the inclined surface 28a of the first protrusion 28 of the second retaining member slides against the inclined surface 722b of the second protrusion 722 of the first retaining member, so the circumferential length of the first protrusion 28 is one-quarter or more of the entire circumference of the inner surface of the connecting portion 21.

[0063] The flexible printed circuit board 400 (wiring 400A) extends along the axial direction (first direction). Specifically, as shown in Figure 9A, one end 401 on the D1 side of the flexible printed circuit board 400 is joined to and electrically connected to the first group of terminals 10 of the liquid crystal panel 1, for example, via an anisotropic conductive adhesive. The anisotropic conductive adhesive can be, for example, an anisotropic conductive film (ACF) or anisotropic conductive paste (ACP). As shown in Figure 9B, a portion of the flexible printed circuit board 400 is supported by the insertion portion 420, as described above. As shown in Figure 9C, the other end 402 on the D2 side of the flexible printed circuit board 400 is electrically connected to the terminal portion of the substrate 82.

[0064] Here, as shown in Figure 9B, the portion of the flexible printed circuit board 400 from the insertion portion 420 to the substrate 82 is the first portion 404. The length of the first portion 404 is the first length 405. The length along the axial direction between the insertion portion 420 and the substrate 82 is the second length 406. The first length 405 is longer than the second length 406. In other words, the first portion 404 is in a slack state toward the downwards. The first portion 404 extends through the notch 421.

[0065] Next, we will describe the state after the liquid crystal panel 1 and the second holding member 2 have rotated. Comparing Figure 10A with Figure 9A, as shown by the arrow in Figure 10A, the liquid crystal panel 1 and the second holding member 2 have rotated 45 degrees counterclockwise (to the left) around the central axis AX. As a result, as shown in Figure 10B, the portion of the flexible printed circuit board 400 from one end 401 to the insertion portion 420 rotates together with the liquid crystal panel 1 and the second holding member 2. Also, since the substrate 82 does not rotate, the first portion 404 of the flexible printed circuit board 400 changes from the slack state shown in Figure 9B to the stretched state shown in Figure 10B. Even if a part of the flexible printed circuit board 400 moves in the circumferential direction during rotation, damage to the flexible printed circuit board 400 is suppressed because the flexible printed circuit board 400 comes into contact with the guide portion 422.

[0066] Next, the light distribution pattern will be explained. As mentioned above, each of the four liquid crystal panels 1 has a plurality of liquid crystal driving electrodes 261, 262 extending in the X direction and aligned in the Y direction, and a plurality of liquid crystal driving electrodes 361, 362 extending in the Y direction and aligned in the X direction. The liquid crystal panels 1 are stacked with the first liquid crystal panel 1 located on the light source side rotated by 180 degrees, 90 degrees, and 270 degrees, respectively, for the second, third, and fourth liquid crystal panels 1. By controlling the potential of each of the liquid crystal driving electrodes 261, 262 and 361, 362, it is possible to control the light distribution pattern to be elliptical with the major axis aligned with the X axis or elliptical with the major axis aligned with the Y axis. Furthermore, in this embodiment, by rotating the four liquid crystal panels 1 around the central axis AX, it is possible to control the light distribution pattern to be elliptical with the major axis rotated by 45 degrees with respect to the X axis or Y axis, for example. A detailed explanation follows below.

[0067] Figure 11 is a schematic diagram showing an example of a light distribution pattern. The first light distribution pattern 810 is an elliptical light distribution pattern with its major axis aligned with the X-axis. This is the light distribution pattern as seen from the D1 side, for example, when, in some or all of the four liquid crystal panels 1, the potential difference between adjacent electrodes of multiple electrodes extending in the X direction and aligned in the Y direction is 0 volts (V), and the potential difference between adjacent electrodes of multiple electrodes extending in the Y direction and aligned in the X direction is greater than 0 volts (V).

[0068] The second light distribution pattern 820 is an elliptical light distribution pattern with its major axis aligned with the Y axis. This is the light distribution pattern as seen from the D1 side, for example, when, in some or all of the four liquid crystal panels 1, the potential difference between adjacent electrodes of multiple electrodes extending in the X direction and aligned in the Y direction is greater than 0 volts (V), and the potential difference between electrodes of multiple adjacent electrodes extending in the Y direction and aligned in the X direction is 0 volts (V).

[0069] The third light distribution pattern 830 is an elliptical light distribution pattern in which the major axis is tilted 45 degrees counterclockwise (leftward) with respect to the Y axis. This can be obtained, for example, by rotating all four liquid crystal panels 1 45 degrees counterclockwise (leftward) around the central axis AX, starting from the state of the second light distribution pattern 820.

[0070] The fourth light distribution pattern 840 is an elliptical light distribution pattern in which the major axis is tilted 45 degrees counterclockwise (leftward) with respect to the X axis. This can be obtained, for example, by rotating all four liquid crystal panels 1 45 degrees counterclockwise (leftward) around the central axis AX, starting from the state of the first light distribution pattern 810. In this embodiment, the rotation is performed 45 degrees counterclockwise (leftward) as shown in Figures 9A to 10A. If Figure 9A is, for example, the second light distribution pattern 820, then Figure 10A is the third light distribution pattern 830. That is, in this embodiment, the light distribution pattern can be changed from the second light distribution pattern 820 to the third light distribution pattern 830.

[0071] As described above, in this embodiment, the lighting device 100 includes an LED 4, a liquid crystal panel 1 positioned on the D1 side relative to the LED 4, a first holding member 6 having a central axis AX extending in the axial direction and holding the LED 4, a second holding member 2, a substrate 82 positioned on the D2 side relative to the first holding member 6 and controlling the liquid crystal panel 1, and wiring 400A extending along the axial direction and electrically connecting the liquid crystal panel 1 and the substrate 82. The second holding member 2 includes a first protrusion 28 provided on the outer circumference of the first holding member 6 and supported so as to be rotatable in the circumferential direction about the axis of the central axis AX relative to the first holding member 6, a panel holding cover 22 that holds the liquid crystal panel 1, and a connecting portion 21 that connects the first protrusion 28 and the panel holding cover 22. The second holding member 2 has a wiring support portion 410 that supports a part of the wiring 400A.

[0072] As mentioned above, in the lighting device of Patent Document 1, the orientation of the LED relative to the base is changed by bending and deforming the cylindrical member in the axial direction. In the lighting device of Patent Document 2, the light distribution angle of the lighting device is converted to an omnidirectional type or a downward type by changing the distance in the axial direction between the base and the LED by changing the length of the connecting member. However, conventionally, there is no lighting device that rotates the light distribution pattern around the axis.

[0073] In this embodiment, the second holding member 2 that holds the liquid crystal panel 1 is rotatable in the circumferential direction about the axis of the central axis AX relative to the first holding member 6. Therefore, if the light distribution pattern is elongated in one direction (for example, vertical or horizontal), the light distribution pattern can be rotated about the central axis AX, thereby providing a variety of light distribution patterns. For example, as explained with reference to Figure 11, the second light distribution pattern 820, which has an elongated elliptical shape along the Y axis, can be changed to the third light distribution pattern 830 by rotating it 45 degrees counterclockwise.

[0074] Furthermore, the second holding member 2 has a wiring support portion 410 that supports a part of the flexible printed circuit board 400, which is an example of wiring 400A. When the liquid crystal panel 1 and the second holding member 2 are rotated relative to the first holding member 6 while the circuit board 82 is not rotating, the flexible printed circuit board 400 also rotates together with the second holding member 2, thereby suppressing twisting of the portion of the flexible printed circuit board 400 from the liquid crystal panel 1 to the wiring support portion 410. As a result, the twisting force due to the rotation of the second holding member 2 is less likely to be applied to the joint between the liquid crystal panel 1 and the flexible printed circuit board 400, thereby suppressing damage to the joint and, consequently, making it less likely for the flexible printed circuit board 400 to detach from the liquid crystal panel 1.

[0075] The rotational support portion of the second retaining member 2 has a first protrusion 28 and an end portion 29 (fitting portion). The outer circumferential surface of the first retaining member 6 is provided with a second protrusion 722 and a projection 724 (fitted portion) that can slide circumferentially relative to the fitting portion when fitted into the fitting portion. Therefore, the second retaining member 2 is less likely to come off the first retaining member 6, and the second retaining member 2 can be rotated smoothly relative to the first retaining member 6.

[0076] The mating portion includes a first projection 28 that protrudes radially inward. The mated portion includes a second projection 722 that protrudes radially outward and is slidable on the first projection 28.

[0077] In this way, the second retaining member 2 can be smoothly rotated relative to the first retaining member 6 with a simple configuration consisting of the first protrusion 28 and the second protrusion 722.

[0078] The wiring 400A is a flexible printed circuit board 400. The wiring support portion 410 is an insertion portion 420 provided on the inner surface of the second holding member 2, and the flexible printed circuit board 400 passes through the inside of the insertion portion 420. In this way, the wiring support portion 410 can be provided with a simple configuration of an insertion portion 420.

[0079] The insertion portion 420 is a cylindrical body extending in the axial direction. Because the insertion portion 420 is a cylindrical body extending in the axial direction, the flexible printed circuit board 400 can be supported more stably even when the flexible printed circuit board 400 moves in the circumferential direction when the second holding member 2 rotates.

[0080] The insertion portion 420 is positioned on the D1 side relative to the second protrusion 722. The first protrusion 28 extends in the circumferential direction, and a notch 421 is provided in a part of the first protrusion 28 in the circumferential direction, through which the wiring 400A can pass. When viewed from the axial direction, the notch 421 and the insertion portion 420 overlap.

[0081] Therefore, the flexible printed circuit board 400 that has passed through the insertion portion 420 continues to extend axially, passing through the notch 421 and reaching the substrate 82. Thus, the flexible printed circuit board 400 can be positioned along the inner surface of the second holding member 2.

[0082] The first length 405 of the first portion 404 of the flexible printed circuit board 400, from the insertion portion 420 to the substrate 82, is longer than the second length 406 along the axial direction between the insertion portion 420 and the substrate 82. In other words, the first portion 404 is in a slack state toward the downward. Therefore, even if the first portion 404 is stretched when the second holding member 2 is rotated, the first portion 404 is less likely to be subjected to tension, thereby suppressing damage to the flexible printed circuit board 400.

[0083] [Second Embodiment] Next, a second embodiment will be described. Figure 12 is a schematic diagram showing a part of the lighting device according to the second embodiment. Figure 13 is a schematic diagram showing the relay connector of Figure 12.

[0084] In the first embodiment, the wiring support portion 410 is an insertion portion 420. In the second embodiment, a relay connector 430 is used as the wiring support portion 410. A detailed explanation follows below.

[0085] The relay connector 430 is attached to the inner surface of the second retaining member 2 (see Figures 4 and 9A). As shown in Figure 12, the wiring 400A includes a flexible printed circuit board 400 extending from the liquid crystal panel 1 to the relay connector 430, and a wire harness 423 extending from the relay connector 430 to the circuit board 82 (see Figures 4 and 9A). When the second retaining member 2 is rotated and the relay connector 430 also rotates as indicated by the arrow, the wire harness 423 follows the rotation.

[0086] As shown in Figure 13, the relay connector 430 comprises a substrate body 431, a connector section 432, and a connector section 433. The connector section 432 is attached to the D1 side of the substrate body 431. The connector section 433 is attached to the D2 side of the substrate body 431. A terminal (not shown) is provided at the D2 side end 403 of the flexible printed circuit board 400, and this terminal is electrically connected to the connector section 432.

[0087] A terminal (not shown) is provided at the D1 end 424 of the wire harness 42, and this terminal is electrically connected to the connector portion 433. A wiring portion 434 is provided inside the main board body 431, the connector portion 432, and the connector portion 433. The flexible printed circuit board 400 and the wire harness 42 are electrically connected via the wiring portion 434. Furthermore, the length of the wire harness 42 extending from the intermediate connector 430 to the board 82 is longer than the axial distance between the intermediate connector 430 and the board 82. In other words, the wire harness 423 extending from the intermediate connector 430 to the board 82 is in a slack state, as shown in the first portion 404 of the flexible printed circuit board 400 in Figure 9B.

[0088] As described above, in this embodiment, the wiring support portion 410 is a relay connector 430 attached to the inner surface of the second holding member 2. The wiring 400A includes a flexible printed circuit board 400 extending from the liquid crystal panel 1 to the relay connector 430, and a wire harness 423 extending from the relay connector 430 to the board 82. At the relay connector 430, the flexible printed circuit board 400 and the wire harness 423 are electrically connected. Generally, the wire harness 423 has higher conformability than the flexible printed circuit board 400. When the second holding member 2 is rotated and the relay connector 430 rotates together, the wire harness 423 follows the rotation, thus further suppressing damage to the wire harness 423.

[0089] Furthermore, the length of the wire harness 423 is longer than the axial distance between the relay connector 430 and the circuit board 82. Therefore, when the second retaining member 2 is rotated, even if the wire harness 423 is stretched, the wire harness 423 is less likely to be subjected to tension, thereby suppressing damage to the wire harness 423. [Explanation of Symbols]

[0090] 1 LCD panel 2. Second retaining member 2A 1st board 3 Reflectors 3A 2nd board 4 LED (light source) 4A liquid crystal layer 5. Mounting components 6. First retaining member 8 Control board 21 Connecting part 21A 1st end 22 Panel retaining cover 22A 2nd end 28. First protrusion (fitting part, rotation support part) 29 End portion (fitting part) 60 Heatsink 62 fins 100 Lighting devices 400 Flexible Printed Circuit Boards (Wiring) 410 Wiring support part 413 Notched groove 420 Insertion section (wiring support section) 421 Notch 422 Guide Section 423 Wire harness (wiring) 430 Intermediate connector (wiring support part) 721 Ring-shaped body 722 Second protrusion (fitted portion) 724 Protrusion (mated part)

Claims

1. Light source and A liquid crystal panel is positioned on one side in the first direction relative to the light source, A first holding member having a central axis extending in a first direction and holding the light source, A second holding member includes a rotating support portion provided on the outer circumference of the first holding member and supporting the first holding member so as to be rotatable in the circumferential direction about the axis of the central axis, a panel holding cover for holding the liquid crystal panel, and a connecting portion connecting the rotating support portion and the panel holding cover. A control board is positioned on the other side in the first direction relative to the first holding member and controls the liquid crystal panel, Wiring extending along a first direction and electrically connecting the liquid crystal panel and the control board, Equipped with, The second holding member has a wiring support portion that supports a part of the wiring, Lighting device.

2. The rotational support portion of the second holding member has a fitting portion that protrudes radially inward, The outer circumferential surface of the first retaining member is provided with a fitted portion that, when fitted into the fitting portion, is slidable in the circumferential direction relative to the fitting portion. The lighting device according to claim 1.

3. The fitting portion includes a first protrusion that protrudes radially inward, The fitted portion includes a second protrusion that protrudes radially outward and is slidable on the first protrusion. The lighting device according to claim 2.

4. The aforementioned wiring is a flexible printed circuit board, The wiring support portion is an insertion portion provided on the inner surface of the second holding member, and the flexible printed circuit board passes through the inside of the insertion portion. The lighting device according to claim 3.

5. The wiring support portion is a relay connector attached to the inner surface of the second holding member, The wiring includes a flexible printed circuit board extending from the liquid crystal panel to the relay connector, and a wire harness extending from the relay connector to the control board. In the aforementioned relay connector, the flexible printed circuit board and the wire harness are electrically connected. A lighting device according to any one of claims 1 to 3.

6. The length of the wire harness is longer than the distance between the relay connector and the control board in the first direction. The lighting device according to claim 5.

7. The aforementioned liquid crystal panels are stacked in multiple layers in the first direction, The plurality of liquid crystal panels are arranged such that liquid crystal panels for p-wave polarization and liquid crystal panels for s-wave polarization are alternately superimposed in a first direction. The lighting device according to claim 1.

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