Light source unit and display device

Abstract

To improve assemblability.SOLUTION: A light source unit A1 comprises one or more light emitting parts 30 for emitting light, a light guide body 5, a housing part 43, and a case 4. The light guide body 5 is formed in a long shape, and guides the light emitted by the light emitting parts 30. The housing part 43 houses the light guide body 5. The case 4 supports the housing part 43 and the light emitting parts 30 while the light emitting parts 30 are arranged at one end or both ends in the long direction of the light guide body 5. The housing part 43 comprises a rear plate 430 opposed to one side surface 52 in the short direction of the light guide body 5, along the long direction of the light guide body 5. The light guide body 5 comprises one or more fitting parts 53 provided in the side surface 52 opposed to the rear plate 430. The rear plate 430 comprises one or more fitted parts 4300 fitted to the fitting parts 53.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a light source unit and a display device, and more particularly to a light source unit that guides light emitted from a light source with a light guide, and a display device having the light source unit.

Background Art

[0002] As a conventional example, the light source device (display device) described in Patent Document 1 is exemplified. The light source device described in Patent Document 1 (hereinafter referred to as the conventional example) includes a point light source composed of an LED, a linear light guide that guides light incident on an incident surface from the point light source, and a planar light guide that guides light emitted from an emission surface of the linear light guide.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above conventional example, the member that supports the linear light guide is desired to have good assemblability.

[0005] An object of the present disclosure is to provide a light source unit and a display device capable of improving assemblability.

Means for Solving the Problems

[0006] A light source unit according to an aspect of the present disclosure includes one or more light emitting portions that emit light, and a light guide that is formed in a long shape and guides the light emitted by the light emitting portions. The light source unit includes a housing portion that houses the light guide, and a housing that supports the housing portion and the light emitting portions with the light emitting portions disposed at one or both ends in the longitudinal direction of the light guide. The housing portion has a wall that faces one side surface in the short-side direction of the light guide along the longitudinal direction of the light guide. The light guide has a plurality of fitting portions provided on the side surface facing the wall. The wall has the same number of mating portions as the fitting portions, each of which mates with one of the plurality of fitting portions. Among the plurality of fitting portions, the fitting portion closest to the light emitting portion is smaller than the other fitting portions excluding the fitting portion. A light source unit according to an aspect of the present disclosure includes one or more light emitting portions that emit light, a light guide that is formed in a long shape and guides the light emitted by the light emitting portions, a housing portion that houses the light guide, and a housing that supports the housing portion and the light emitting portions with the light emitting portions disposed at one or both ends in the longitudinal direction of the light guide. The housing portion has a wall that faces one side surface in the short-side direction of the light guide along the longitudinal direction of the light guide, and is configured to open the other side surface in the short-side direction of the light guide and the light emitting surface of the light guide. The light guide has one or more fitting portions provided on the side surface facing the wall. The wall has one or more mating portions that mate with the fitting portions. The fitting portions are formed to protrude from the side surface facing the wall toward the wall along the short-side direction of the light guide.

[0007] A display device according to an aspect of the present disclosure includes the light source unit, a display panel illuminated by the light source unit, and a main body that holds the display panel and the light source unit.

Advantages of the Invention

[0008] The light source unit and the display device of the present disclosure have an effect of improving assemblability.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Embodiments for Carrying Out the Invention

[0010] A light source unit according to an embodiment of the present disclosure and a display device according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, each of the drawings described in the following embodiments is a schematic diagram, and the respective ratios of the sizes and thicknesses of the respective components do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be achieved.

[0011] (1) Outline of the embodiment (1-1) Outline of the light source unit according to the embodiment The light source unit A1 according to the embodiment includes one or more light emitting portions 30 that emit light, a light guide 5, a housing portion 43, and a housing 4 (see FIG. 6). The light guide 5 is formed in a long shape and guides the light emitted by the light emitting portion 30. The housing portion 43 houses the light guide 5. The housing 4 supports the housing portion 43 and the light emitting portion 30 with the light emitting portion 30 disposed at one or both ends in the longitudinal direction of the light guide 5. The housing portion 43 has a wall (rear plate 430) facing one side surface 52 in the short side direction of the light guide 5 along the longitudinal direction of the light guide 5. The light guide 5 has one or more fitting portions 53 provided on the side surface 52 facing the wall (rear plate 430). The wall (rear plate 430) has one or more fitted portions 4300 that fit with the fitting portions 53.

[0012] Thus, since the light guide 5 of the light source unit A1 according to the embodiment has the fitting portions 53 that fit with the fitted portions 4300 provided on the wall (rear plate 430), it is possible to prevent the light guide 5 housed in the housing portion 43 from falling off without performing operations such as adhesion, and to improve the assemblability.

[0013] (1-2) Outline of the display device according to the embodiment The display device B1 according to the embodiment includes the light source unit A1 according to the embodiment, a display panel 20 illuminated by the light source unit A1 according to the embodiment, and a main body 1 that holds the display panel 20 and the light source unit A1 according to the embodiment (see FIG. 2).

[0014] The display device B1 according to the embodiment can improve its assemblability as the assemblability of the light source unit A1 according to the embodiment is improved.

[0015] (2) Details of the embodiment (2-1) Configuration of the display device according to the embodiment The display device B1 according to the embodiment (hereinafter abbreviated as the display device B1) will be described with reference to the drawings. Note that the display device B1 described below is an induction lamp installed at an evacuation exit of a building such as an office or a store, or a passage to the evacuation exit. However, the display device according to the embodiment is not limited to an induction lamp, and may be used, for example, for the purpose of indicating a specific location (such as a dressing room) inside a building. In the following description, unless otherwise specified, the up-down, front-back, and left-right directions indicated by the arrows in FIG. 1 are defined as the up-down, front-back, and left-right directions of the display device B1.

[0016] The display device B1 includes a light source unit A1 according to the embodiment (hereinafter abbreviated as the light source unit A1), a main body 1, a display block 2, etc. (see FIGS. 1 to 3).

[0017] The main body 1 is formed of a synthetic resin material into a rectangular box shape having an opening on the front surface (see FIG. 2). The main body 1 houses a power supply device 11 for lighting the light source unit A1, a battery unit 13 having a secondary battery, a terminal block 12, a mounting plate 10, etc.

[0018] The power supply device 11 lights the light source unit A1 with commercial power supplied from a commercial power source (for example, a commercial power system), and charges the battery unit 13. Further, when there is a power outage in the power system, the power supply device 11 lights the light source unit A1 with emergency power supplied from the battery unit 13.

[0019] The mounting plate 10 is formed in a plate shape from a metal material (see FIG. 2). The mounting plate 10 is screwed to the inner bottom surface of the main body 1. The power supply device 11 and the terminal block 12 are screwed to the mounting plate 10 and housed inside the main body 1. Note that the battery unit 13 is detachably attached to the mounting plate 10.

[0020] The display block 2 has a display panel 20, a light guide plate 21, and a holder 22 (see FIG. 2).

[0021] The display panel 20 is formed in a rectangular flat plate shape by a synthetic resin material having translucency such as acrylic resin or polycarbonate resin. However, the display panel 20 may be formed of a material having translucency other than synthetic resin such as quartz glass. A pictogram 201 for evacuation guidance is displayed on the front surface (display surface 200) of the display panel 20 (see FIG. 1).

[0022] The light guide plate 21 is formed in a rectangular flat plate shape by a synthetic resin material having translucency such as acrylic resin or polycarbonate resin. The light guide plate 21 is disposed behind the display panel 20 so that its front surface faces the rear surface of the display panel 20 (see FIG. 2). Light emitted from the light source unit A1 is incident on the upper surface (incident surface 210) of the light guide plate 21 (see FIG. 4). The light incident from the incident surface 210 is guided inside the light guide plate 21 and emitted from the front surface (emission surface 211) of the light guide plate 21. Then, the display panel 20 is illuminated by the light emitted from the emission surface 211 of the light guide plate 21.

[0023] The holder 22 is formed in a rectangular box shape with an open front and upper surface by a synthetic resin material having no translucency. The holder 22 holds the display panel 20 and the light guide plate 21 so that the display panel 20 is disposed in front of the light guide plate 21 (see FIGS. 2 and 3).

[0024] The display block 2 is attached to the main body 1 so as to cover the remaining part of the opening of the main body 1 excluding the upper part where the light source unit A1 is attached (see FIGS. 1 and 3). In a state where the light source unit A1 is attached to the main body 1, the incident surface 210 of the light guide plate 21 and the emission surface 51 (described later) of the light guide 5 of the light source unit A1 face each other in the vertical direction (see FIG. 4). Therefore, almost all of the light emitted from the emission surface 51 of the light guide 5 enters the light guide plate 21 from the incident surface 210 of the light guide plate 21. The light that has entered the light guide plate 21 is totally reflected at the rear surface of the holder 22 while traveling inside the light guide plate 21 and can be emitted forward from the emission surface 211 of the light guide plate 21 to illuminate the display panel 20.

[0025] (2-2) Configuration of the light source unit according to the embodiment The light source unit A1 includes a light emitting block 3, a light guide 5, and a housing 4 (see FIGS. 5 and 6). In the following description, unless otherwise specified, the vertical, front-rear, and left-right directions indicated by the arrows in FIG. 6 are defined as the vertical, front-rear, and left-right directions of the light source unit A1.

[0026] (2-2-1) Light emitting block The light emitting block 3 includes a light emitting portion 30, a heat radiating member 31, a fixture 32, and a heat conducting member 33 (see FIGS. 6 and 7).

[0027] The light emitting portion 30 includes an LED 300 which is a solid-state light source, and a substrate 301 on which the LED 300 is mounted. The LED 300 is, for example, a packaged white LED for illumination. The substrate 301 is a printed wiring board formed in a substantially T-shape when viewed from the left-right direction (see FIGS. 6 and 7B). The LED 300 is mounted on the surface of the wide portion of the substrate 301. A pair of electrodes 302 are formed on the surface of the narrow portion of the substrate 301. The pair of electrodes 302 are electrically connected to the anode and cathode of the LED 300 one by one via the printed wiring of the substrate 301.

[0028] The heat radiating member 31 has a heat radiating plate 310, a coupling portion 311 that is thermally coupled to the back surface of the substrate 301, and two protruding portions 312. The heat radiating plate 310 and the coupling portion 311 are each formed in a rectangular flat plate shape. However, the heat radiating plate 310 is formed to be sufficiently larger than the substrate 301, and the coupling portion 311 is formed to be smaller than the substrate 301. Further, the coupling portion 311 is integrally formed with the heat radiating plate 310 so as to protrude in the thickness direction (front-rear direction) of the heat radiating plate 310. In other words, the heat radiating member 31 is formed in a substantially L shape by the heat radiating plate 310 and the coupling portion 311 (see FIG. 6).

[0029] The two protruding portions 312 are each integrally formed with the heat radiating plate 310 by raising a part of the heat radiating plate 310 (see FIGS. 6 and 7A). Each protruding portion 312 is formed in a substantially trapezoidal shape when viewed from the front-rear direction. One end of each protruding portion 312 (the portion corresponding to the lower base of the trapezoid) is connected to the heat radiating plate 310. And each protruding portion 312 is configured to be displaceable (flexible) in the front-rear direction with one end connected to the heat radiating plate 310 as a fulcrum.

[0030] Also, one square hole 313 is provided at the center in the longitudinal direction (left-right direction) in the short side direction (up-down direction) of the heat radiating plate 310 (see FIGS. 6 and 7A). These two holes 313 penetrate the heat radiating plate 310 in the thickness direction (front-rear direction).

[0031] The heat conducting member 33 is formed in a square shape, for example, of a sheet-like silicone resin (see FIG. 6). The heat conducting member 33 is interposed between the coupling portion 311 and the substrate 301 and thermally couples the coupling portion 311 and the substrate 301. That is, the heat generated in the LED 300 is conducted from the substrate 301 to the heat radiating member 31 through the heat conducting member 33.

[0032] The fixture 32 has a main body portion 320, a first protruding piece 321, a second protruding piece 322, a pair of pressing portions 323, and a pair of claws 324 (see FIGS. 6 and 7). Note that the main body portion 320, the first protruding piece 321, the second protruding piece 322, the pressing portions 323, and the pair of claws 324 are integrally formed of a synthetic resin material.

[0033] The main body portion 320 is formed in a U shape. Each of the pair of claws 324 is formed in a frustum of a pyramid shape. The pair of claws 324 are respectively provided one by one on the inner surfaces at both ends of the main body portion 320.

[0034] The first protruding piece 321 is formed in a flat plate shape of a quadrilateral. The first protruding piece 321 faces the front end of the main body portion 320 (see FIG. 7C). The second protruding piece 322 is formed in a C shape in a plan view (see FIG. 6). The second protruding piece 322 faces the rear end of the main body portion 320 (see FIG. 7C). Note that the first protruding piece 321 and the second protruding piece 322 respectively protrude in the same direction (the right direction in FIG. 6) as both ends of the main body portion 320.

[0035] Each of the pair of pressing portions 323 is formed in a rectangular parallelepiped shape (see FIG. 6). The pair of pressing portions 323 protrude from the inner surface (left side surface) of the main body portion 320.

[0036] Thus, the fixture 32 arranges the coupling portion 311 between the first protruding piece 321 and the second protruding piece 322, and hooks the pair of claws 324 one by one on the upper end and the lower end of the substrate 301, thereby fixing the light emitting portion 30 to the heat dissipation member 31 (see FIG. 7B). Note that the fixture 32 increases the degree of adhesion between the coupling portion 311 and the substrate 301 and the heat conduction member 33 by pressing the coupling portion 311 in the direction approaching the substrate 301 (leftward) by the pair of pressing portions 323.

[0037] (2-2-2) Light guide The light guide 5 is formed in a quadrangular prism shape by a synthetic resin material having translucency such as acrylic resin or polycarbonate resin (see FIGS. 6 and 8). However, the shape of the light guide 5 is not limited to a quadrangular prism shape, and may be a shape such as a quadrangular pyramid shape or a frustum of a quadrangular pyramid shape.

[0038] Of the two bottom surfaces (left bottom surface and right bottom surface) facing each other in the longitudinal direction (axial direction) of the light guide 5, one bottom surface (right bottom surface) serves as the incident surface 50. Also, one of the four side surfaces (front surface, rear surface, upper surface, lower surface) of the light guide 5, specifically the lower surface, serves as the exit surface 51. Further, a large number of concave grooves 54 are provided on the side surface (upper surface) facing the exit surface 51 of the light guide 5. These concave grooves 54 are arranged in parallel such that the distance between adjacent concave grooves 54 decreases as the distance from the incident surface 50 increases (see Fig. 8B).

[0039] Among the four side surfaces of the light guide 5, a plurality (four in the illustrated example) of fitting portions 53 are provided on the two side surfaces 52 (front surface and rear surface) adjacent to the exit surface 51. The four fitting portions 53 are provided in two each on the two side surfaces 52 (see Figs. 8A and 8C). Among the fitting portions 53 provided in two each on each side surface 52, the two fitting portions 53 closer to the incident surface 50 may be referred to as the first fitting portions 53A, and the two fitting portions 53 farther from the incident surface 50 may be referred to as the second fitting portions 53B.

[0040] The two first fitting portions 53A are formed in a quadrangular prism shape with a trapezoidal bottom surface. However, the upper surfaces of the two first fitting portions 53A form a smaller angle with the side surface 52 compared to the lower surfaces of the two first fitting portions 53A.

[0041] The two second fitting portions 53B have a quadrangular prism-shaped protrusion 530 with a trapezoidal bottom surface and a rectangular parallelepiped-shaped pedestal 531 extending straight up from the upper end of the protrusion 530 (see Figs. 6 and 8). Note that the upper surface of the pedestal 531 is a downward inclined surface.

[0042] (2-2-3) Housing The housing 4 has a front wall 40, an upper wall 41, a pair of side walls 42, a housing portion 43, a mounting portion 44, a plurality of positioning portions 45, a pair of mounting pieces 46, and a pair of support pieces 47 (see FIG. 6). The front wall 40 is formed in a rectangular flat plate shape. The upper wall 41 is formed in a rectangular flat plate shape and protrudes rearward from the upper end of the front wall 40. Each of the pair of side walls 42 is formed in a rectangular flat plate shape and protrudes rearward from both the left and right ends of the front wall 40. The upper ends of the pair of side walls 42 are connected to both longitudinal ends of the upper wall 41. That is, the housing 4 is formed in a long box shape with the rear surface and the lower surface open by the front wall 40, the upper wall 41, and the pair of side walls 42.

[0043] The housing portion 43 is formed in a long box shape with the front surface, the lower surface, and the right side surface open (see FIGS. 6 and 9). The housing portion 43 houses the light guide 5 such that the incident surface 50 is exposed from the right side surface and the exit surface 51 is exposed from the lower surface (see FIG. 5).

[0044] The housing portion 43 has a rear plate 430, an upper plate 431, a front plate 432, and a side plate 433 (see FIGS. 6 and 11). The rear plate 430 is formed in a long rectangular shape slightly shorter than the front wall 40 of the housing 4 and faces the front wall 40 in the front-rear direction (see FIG. 6). The upper plate 431 is formed in a long rectangular shape with the longitudinal length substantially equal to the longitudinal length of the rear plate 430 and protrudes forward from the upper end of the rear plate 430 (see FIG. 11). The side plate 433 is formed in a rectangular flat plate shape and is connected to the left end surfaces of the rear plate 430 and the upper plate 431, respectively (see FIG. 6). A rib 4330 protrudes rightward from the front end of the side plate 433. Note that the distance along the front-rear direction between the rear plate 430 and the rib 4330 is slightly larger than the thickness of the light guide 5 in the front-rear direction.

[0045] Here, two fitting portions 4300 are provided on the rear plate 430 (see FIG. 6). The two fitting portions 4300 are each composed of a quadrangular hole. The two fitting portions 4300 are respectively fitted with the fitting portions (the first fitting portion 53A and the second fitting portion 53B) provided on the side surface 52 on the rear side of the light guide 5.

[0046] The front plate 432 is formed in a rectangular flat plate shape. The front plate 432 protrudes downward from the right end of the upper plate 431 so as to face the rear plate 430 (see FIGS. 6 and 11). The length of the front plate 432 in the longitudinal direction (left - right direction) is shorter than the length of the heat sink 310 in the longitudinal direction (see FIGS. 6 and 10). Note that the distance between the rear plate 430 and the front plate 432 along the front - rear direction is equal to the distance between the rear plate 430 and the rib 4330 along the front - rear direction (see FIG. 10).

[0047] The attachment portion 44 has a pair of protrusions 440, a pressing piece 441, a contact piece 442, and a fitting portion 443, and is configured to attach the light - emitting block 3 to the housing 4 (see FIGS. 6 and 10).

[0048] The pair of protrusions 440 are provided on the inner surface (left - hand side surface) of the right - hand side wall 42 among the pair of side walls 42 (see FIG. 6). The pair of protrusions 440 are formed in a columnar shape with the vertical direction as the axial direction. The pair of protrusions 440 protrude from the inner surface of the side wall 42 so as to be parallel to each other with a certain interval in the front - rear direction. Note that the interval in the front - rear direction of the pair of protrusions 440 is slightly larger than the width dimension of the main body portion 320 of the fixture 32 (see FIG. 10).

[0049] The pressing piece 441 is formed in an L - shape when viewed from the vertical direction. The pressing piece 441 is integrally formed with the side wall 42 so as to protrude rearward and leftward from the rear end on the inner surface of the right - hand side wall 42 (see FIGS. 6 and 10).

[0050] The contact piece 442 is provided at the right end of the rear plate 430 (see FIG. 6). The contact piece 442 is formed in an L - shape when viewed from the vertical direction and is integrally formed with the rear plate 430 so as to protrude rearward and rightward from the right end of the rear plate 430 (see FIGS. 6 and 10).

[0051] The fitting part 443 is provided at the upper right end on the rear surface of the front wall 40 (see Fig. 10). The fitting part 443 is formed in a triangular prism shape. The fitting part 443 is formed such that the axial direction coincides with the left - right direction, and the amount of protrusion from the rear surface of the front wall 40 increases as it approaches the upper wall 41 (see Fig. 11).

[0052] A plurality (two in this embodiment) of positioning parts 45 are respectively provided on both the left and right sides on the rear surface of the rear plate 430 (see Figs. 6 and 9). Each positioning part 45 has a pair of rectangular parallelepipeds. These pair of rectangular parallelepipeds protrude rearward from the rear surface of the rear plate 430 so that the axial direction coincides with the up - down direction and they are arranged in parallel with a gap of a certain width (see Fig. 9). Note that the width of the gap in each positioning part 45 is slightly larger than the left - right width of the fitting part 53 of the light guide 5.

[0053] The right - hand fitting part 53 (the first fitting part 53A) on the front - side side surface 52 of the light guide 5 fits into the gap of the right - hand positioning part 45 (see Figs. 9 and 10). Also, the left - hand fitting part 53 (the second fitting part 53B) on the front - side side surface 52 of the light guide 5 fits into the gap of the left - hand positioning part 45 (see Fig. 9). That is, the two positioning parts 45 play a role of positioning the light guide 5 housed in the housing part 43 in the left - right direction with respect to the housing 4.

[0054] A pair of support pieces 47 protrude rearward one by one from both the left and right ends of the upper wall 41. Also, a pair of mounting pieces 46 protrude rearward one by one from both the left and right ends of the upper wall 41. However, each mounting piece 46 is located inside each support piece 47 (see Fig. 6).

[0055] (2 - 3) Assembly procedure of the light source unit according to the embodiment Next, the assembly procedure of the light source unit A1 will be described. However, the description of the assembly procedure of the light - emitting block 3 is omitted. Also, the assembly procedure described below is an example, and it is possible to change the order of some procedures.

[0056] First, the operator performing the assembly work inserts the light guide 5 into the housing portion 43 from the lower surface of the housing portion 43 by inserting the first fitting portion 53A and the second fitting portion 53B on the front side surface 52 of the light guide 5 into the respective gaps of the two positioning portions 45.

[0057] Here, the upper surfaces of the first fitting portion 53A and the protrusion 530 of the second fitting portion 53B are inclined surfaces that lower the height from the side surface 52 as they go upward (see FIGS. 12 and 13). Therefore, in the process of the operator inserting the light guide 5 into the housing portion 43, when the upper surfaces of the first fitting portion 53A and the protrusion 530 of the second fitting portion 53B hit the lower end of the rear plate 430 of the housing portion 43, the rear plate 430 bends backward.

[0058] Then, when the operator inserts the light guide 5 until it hits the upper plate 431 of the housing portion 43, the protrusion 530 of the first fitting portion 53A and the second fitting portion 53B are respectively fitted into the two fitting portions 4300 provided on the rear plate 430 one by one, and the rear plate 430 returns to its original state (see FIGS. 12 and 13).

[0059] In this way, the operator accommodates the light guide 5 in the housing portion 43 of the housing 4. And the light guide 5 accommodated in the housing portion 43 is prevented from falling off the housing portion 43 by the two fitting portions 53 (the first fitting portion 53A and the second fitting portion 53B) being respectively fitted into the two fitting portions 4300.

[0060] Subsequently, the operator attaches the light emitting block 3 to the attachment portion 44 of the housing 4. That is, the operator inserts the coupling portion 311 of the light emitting portion 30, the fixture 32, and the heat radiating member 31 from below the housing 4 between the right side wall 42 and the right end of the rear plate 430. At this time, the operator inserts the main body portion 320 of the fixture 32 between the pair of protrusions 440. At the same time, the operator inserts the heat radiating plate 310 of the heat radiating member 31 from below the housing 4 into the gap between the front wall 40 and the front plate 432.

[0061] Then, the upper end of the heat sink 310 crosses over the fitting portion 443, and the fitting portion 443 fits into the upper hole 313 of the heat sink 310, thereby preventing the heat dissipation member 31 from coming off the housing 4 (see FIG. 11). Further, the pair of protrusions 440, the pressing piece 441, and the contact piece 442 of the attachment portion 44 restrict the movement of the fixture 32 in the front-rear direction and the left-right direction (see FIG. 10). In this way, the operator can attach the light-emitting block 3 to the attachment portion 44.

[0062] In the above manner, the assembly of the light source unit A1 is completed. In the assembled light source unit A1, the narrow end portion of the substrate 301 of the light-emitting portion 30 (the portion where the electrodes 302 are provided) protrudes rearward from the pressing piece 441 of the housing 4 (see FIG. 5).

[0063] (2-4) Construction Procedure of the Display Device According to the Embodiment Next, the construction procedure of the display device B1 will be described.

[0064] First, the operator performing the construction work draws a power cord through the power supply hole 15 provided on the bottom surface of the main body 1 (see FIG. 2), and then attaches the main body 1 to the wall surface with wood screws or wall plugs.

[0065] Subsequently, the operator electrically connects the power cord drawn through the power supply hole 15 to the terminal block 12. Then, the operator attaches the display block 2 to the main body 1 (see FIG. 3).

[0066] Finally, the operator inserts the narrow portion of the substrate 301 into the connector 14 of the main body 1, and attaches the light source unit A1 to the main body 1 by hooking the claws provided at the tips of the pair of attachment pieces 46 on the edge of the hole provided on the upper surface of the main body 1 (see FIG. 1).

[0067] In the above manner, the construction of the display device B1 is completed.

[0068] (3) Others The light source unit A1 may include two light emitting blocks 3. The two light emitting blocks 3 are respectively arranged at both longitudinal ends of the light guide 5. In this case, one mounting portion 44 is provided at each longitudinal end of the housing 4.

[0069] Also, the display device B1 may be configured such that a set of a light emitting block 3 and a display block 2 is attached to each of the front surface and the rear surface of the main body 1.

[0070] (4) Advantages of the light source unit according to the embodiment As described above, the light source unit A1 fixes the light guide 5 to the housing portion by fitting one or more fitting portions 53 provided on the side surface 52 of the light guide 5 into the fitted portions 4300 provided on the wall (rear plate 430) of the housing portion 43.

[0071] Thus, when the light source unit A1 houses the light guide 5 in the housing portion 43, it is possible to prevent the light guide 5 housed in the housing portion 43 from falling off without performing additional operations such as adhesion, and to improve the assemblability.

[0072] By the way, when the fitting portion is formed to be recessed in a direction away from the rear plate 430 from the side surface 52 of the light guide 5, among the light traveling in the light guide 5, the light reaching the fitting portion may be reflected at the interface of the fitting portion and emitted from the emission surface 51 of the light guide 5 and incident on the light guide plate 21. When the light reflected at the interface of the fitting portion in this way is incident on the light guide plate 21, it may cause bright lines on the display panel 20 or unevenness in the brightness of the display panel 20.

[0073] On the other hand, the light source unit A1 forms the fitting portion 53 so as to protrude from the side surface 52 of the light guide 5 toward the rear plate 430 of the housing portion 43. Therefore, among the light traveling in the light guide 5, the light reaching the fitting portion 53 is emitted out of the light guide 5 from the fitting portion 53 without being reflected at the interface of the fitting portion 53 (see FIG. 14). Therefore, the light source unit A1 has an advantage that it is difficult to cause bright lines on the display panel 20.

[0074] In addition, since the light source unit A1 uses the hole provided in the rear plate 430 of the housing portion 43 as the fitting portion 4300 to be fitted, the fitting portion 4300 can be formed together when the housing 4 is resin-molded. Therefore, since the light source unit A1 does not require an independent process for forming the fitting portion 4300, further improvement in assemblability can be achieved.

[0075] Furthermore, the light source unit A1 has an inclined surface on the upper surface of the fitting portion 53 that inclines along the direction (upward direction) in which the light guide 5 is accommodated in the housing portion 43 (see FIGS. 12 and 13). Therefore, when the light guide 5 is inserted upward from the lower surface of the housing portion 43, the light source unit A1 can flex the rear plate 430 of the housing portion 43 along the inclined surface of the fitting portion 53 to smoothly fit the fitting portion 53 into the fitting portion 4300 to be fitted. As a result, the light source unit A1 can further improve assemblability.

[0076] By the way, two types of fitting portions 53, that is, a first fitting portion 53A and a second fitting portion 53B, are provided on the light guide 5. And on the side surface 52 of the light guide 5, the first fitting portion 53A closer to the light emitting portion 30 is formed smaller than the second fitting portion 53B farther from the light emitting portion 30 (see FIG. 8A). Specifically, the protrusions 530 of the first fitting portion 53A and the second fitting portion 53B are substantially the same size, and the first fitting portion 53A is smaller than the second fitting portion 53B by the amount of the boss 531.

[0077] Thus, by relatively reducing the size of the first fitting portion 53A closer to the incident surface 50, the light source unit A1 can reduce the amount of light emitted from the first fitting portion 53A to the outside of the light guide 5 and improve luminous efficiency.

[0078] (5) Summary The light source unit (A1) according to the first aspect of the present disclosure includes one or more light emitting portions (30) that emit light, a light guide (5), a housing portion (43), and a housing (4). The light guide (5) is formed in a long shape and guides the light emitted by the light emitting portion (30). The housing portion (43) houses the light guide (5). The housing (4) supports the housing portion (43) and the light emitting portion (30) with the light emitting portion (30) disposed at one or both ends in the longitudinal direction of the light guide (5). The housing portion (43) has a wall (rear plate 430) facing one side surface (52) in the short side direction of the light guide (5) along the longitudinal direction of the light guide (5). The light guide (5) has one or more fitting portions (53) provided on the side surface (52) facing the wall. The wall has one or more fitting portions (4300) that fit with the fitting portions (53).

[0079] Since the light guide (5) of the light source unit (A1) according to the first aspect has the fitting portion (53) that fits with the fitting portion (4300) provided on the wall (rear plate 430), it is possible to prevent the light guide 5 housed in the housing portion (43) from falling off without performing operations such as adhesion, and improve the assemblability.

[0080] The light source unit (A1) according to the second aspect of the present disclosure can be realized by a combination with the first aspect. In the light source unit (A1) according to the second aspect, the fitting portion (53) is preferably formed to protrude from the side surface (52) toward the wall.

[0081] Among the light traveling in the light guide (5) of the light source unit (A1) according to the second aspect, the light that reaches the fitting portion (53) is emitted from the fitting portion (53) to the outside of the light guide (5) without being reflected at the interface of the fitting portion (53). Therefore, the light source unit (A1) according to the second aspect is less likely to generate bright lines on the display panel (20).

[0082] The light source unit (A1) according to the third aspect of the present disclosure can be realized by a combination with the second aspect. In the light source unit (A1) according to the third aspect, the fitting portion (4300) is preferably a hole provided in the wall.

[0083] The light source unit (A1) according to the third aspect can form the fitting portion (4300) together when creating the housing (4). As a result, since the light source unit (A1) according to the third aspect does not require an independent process for forming the fitting portion (4300), further improvement in assemblability can be achieved.

[0084] The light source unit (A1) according to the fourth aspect of the present disclosure can be realized in combination with the third aspect. In the light source unit (A1) according to the fourth aspect, the fitting portion (53) preferably has an inclined surface that inclines along the direction in which the light guide (5) is accommodated in the accommodation portion (43).

[0085] The light source unit (A1) according to the fourth aspect can smoothly fit the fitting portion (53) into the fitting portion (4300) by bending the rear plate (430) of the accommodation portion (43) along the inclined surface of the fitting portion (53). As a result, the light source unit (A1) can further improve assemblability.

[0086] The light source unit (A1) according to the fifth aspect of the present disclosure can be realized in combination with any of the first to fourth aspects. In the light source unit (A1) according to the fifth aspect, the light guide (5) preferably has a plurality of fitting portions (53). The wall preferably has the same number of fitting portions (4300) as the fitting portions (53). Each of the plurality of fitting portions (53) is preferably fitted to one of the plurality of fitting portions (4300). Among the plurality of fitting portions (53), the fitting portion closest to the light emitting portion (30) (the first fitting portion 53A) is preferably smaller than the other fitting portions (the second fitting portion 53B) excluding the fitting portion (the first fitting portion 53A).

[0087] The light source unit (A1) according to the fifth aspect can reduce the amount of light emitted from the fitting portion (the first fitting portion 53A) outside the light guide (5) by making the first fitting portion (53A) closer to the incident surface (50) relatively smaller, thereby improving the light emission efficiency.

[0088] The display device (B1) according to the sixth aspect of the present disclosure includes a light source unit (A1) according to any one of the first to fifth aspects, a display panel (20) illuminated by the light source unit (A1), and a main body (1) that holds the display panel (20) and the light source unit (A1).

[0089] The display device (B1) according to the sixth aspect can improve the assemblability in the light source unit (A1).

Explanation of Signs

[0090] A1 Light source unit B1 Display device 1 Main body 4 Housing 5 Light guide 20 Display panel 30 Light emitting part 43 Accommodating part 45 Positioning part 51 Emitting surface 52 Side surface 53 Fitting part 53A First fitting part (fitting part) 53B Second fitting part (fitting part) 300 LED (solid light source) 301 Substrate 430 Rear plate (wall) 4300 Fitted part

Claims

1. One or more light-emitting parts that emit light, A light guide formed in a long shape that guides the light emitted by the light-emitting part, A housing part that houses the light guide, A housing that supports the housing part and the light-emitting part with the light-emitting part disposed at one or both ends in the longitudinal direction of the light guide, having, The housing part has a wall facing one side surface in the short side direction of the light guide along the longitudinal direction of the light guide, The light guide has a plurality of fitting parts provided on the side surface facing the wall, The wall has the same number of mating parts as the fitting parts, each mating with one of the plurality of fitting parts, Among the plurality of fitting parts, the fitting part closest to the light-emitting part is smaller than the other fitting parts excluding the fitting part, A light source unit.

2. The plurality of fitting parts are formed to protrude from the side surface toward the wall, The light source unit according to Claim 1.

3. The plurality of mating parts are holes provided in the wall, The light source unit according to Claim 2.

4. The plurality of fitting parts have inclined surfaces that are inclined along the direction in which the light guide is housed in the housing part, The light source unit according to Claim 3.

5. One or more light-emitting parts that emit light, A light guide formed in a long shape that guides the light emitted by the light-emitting part, A housing part that houses the light guide, A housing that supports the housing part and the light-emitting part with the light-emitting part disposed at one or both ends in the longitudinal direction of the light guide, having, The housing part has a wall facing one side surface in the short side direction of the light guide along the longitudinal direction of the light guide, and is configured to open the other side surface in the short side direction of the light guide and the light-emitting surface of the light guide, The light guide has one or more fitting parts provided on the side surface facing the wall, The wall has one or more mating parts that mate with the fitting parts, The fitting part is formed to protrude from the side surface facing the wall along the short side direction of the light guide toward the wall, A light source unit.

6. Any one of the light source units according to Claims 1 to 5, A display panel illuminated by the light source unit, A main body that holds the display panel and the light source unit, comprising, A display device.

Images