Light source unit and display device

Abstract

To improve heat dissipation performance.SOLUTION: A light source unit A1 comprises one or more light emitting parts 30 for emitting light, a light guide body 5, a case 4, and a heat dissipation member 31. The light guide body 5 is formed in a long shape, and guides the light emitted by the light emitting parts 30. The case 4 supports the light guide body 5 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 heat dissipation member 31 is thermally connected to the light emitting parts 30. The heat dissipation member 31 comprises a heat dissipation plate 310 arranged in the case 4, along the long direction of the light guide body 5.SELECTED DRAWING: Figure 5

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, a 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 a 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, as the temperature of the point light source during lighting increases, the luminous efficiency of the point light source tends to decrease. Therefore, it is desirable to improve heat dissipation.

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

Means for Solving the Problems

[0006] A light source unit according to one 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 that supports the light guide and the light emitting portions with the light emitting portions disposed at one or both ends in the longitudinal direction of the light guide, and a heat radiating member that is thermally coupled to the light emitting portions. The light emitting portions include one or more solid light sources and a substrate on which the solid light sources are mounted on a surface. The heat radiating member includes a heat radiating plate disposed in the housing along the longitudinal direction of the light guide, and a coupling portion that is thermally coupled to the back surface of the substrate. The light source unit further includes a fixture that fixes the coupling portion of the heat radiating member to the substrate of the light emitting portion. The fixture has a U-shaped main body, claws provided one by one at both ends of the main body, and a first protruding piece and a second protruding piece provided on the main body so as to sandwich the main body from the front-rear direction. The fixture arranges the coupling part between the first protruding piece and the second protruding piece, and fixes the coupling part to the substrate by hooking the claws one by one on both ends of the substrate.

[0007] A display device according to one 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.

Effect of the Invention

[0008] The light source unit and the display device of the present disclosure have an effect that heat dissipation can be improved.

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

[0010] The light source unit according to an embodiment of the present disclosure and the display device according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, each drawing 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) Summary 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 4, and a heat dissipation member 31 (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 4 supports the light guide 5 and the light-emitting portion 30 in a state where the light-emitting portion 30 is disposed at one end or both ends in the longitudinal direction of the light guide 5. The heat dissipation member 31 is thermally coupled to the light-emitting portion 30. The heat dissipation member 31 has a heat dissipation plate 310 disposed in the housing 4 along the longitudinal direction of the light guide 5.

[0012] The light emitting unit 30 has a solid light source such as an LED (Light Emitting Diode), for example. The solid light source converts part of the power supplied from the outside into light and emits light, and releases the rest of the power as heat. Generally, a solid light source such as an LED has a characteristic that the luminous efficiency decreases as the temperature rises due to heat generation.

[0013] Thus, the light source unit A1 according to the embodiment can improve the heat dissipation by dissipating the heat generated by the light emitting unit 30 (the solid light source thereof) through the heat dissipation member 31 that is thermally coupled to the light emitting unit 30. Moreover, since the heat dissipation plate 310 included in the heat dissipation member 31 is arranged in the housing 4 along the longitudinal direction of the light guide 5 in the light source unit A1 according to the embodiment (see FIG. 5), the space in the housing 4 can be effectively utilized to improve the heat dissipation. As a result, the light source unit A1 according to the embodiment can suppress the decrease in the luminous efficiency of the light emitting unit 30 due to the temperature rise.

[0014] (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, the display panel 20 illuminated by the light source unit A1 according to the embodiment, and the main body 1 that holds the display panel 20 and the light source unit A1 according to the embodiment (see FIG. 2).

[0015] The display device B1 according to the embodiment can improve the visibility by suppressing the decrease in the amount of light illuminating the display panel 20 because the light source unit A1 according to the embodiment suppresses the decrease in the luminous efficiency of the light emitting unit 30.

[0016] (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 or a passage to an evacuation exit in a building such as an office or a store. 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 arrows in FIG. 1 are defined as the up-down, front-back, and left-right directions of the display device B1.

[0017] 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).

[0018] 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.

[0019] 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, the power supply device 11 lights the light source unit A1 with emergency power supplied from the battery unit 13 when a power outage occurs in the power system.

[0020] The mounting plate 10 is formed of a metal material into a plate shape (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.

[0021] The display block 2 includes a display panel 20, a light guide plate 21, and a holder 22 (see FIG. 2).

[0022] 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).

[0023] 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.

[0024] The holder 22 is formed of a synthetic resin material having no translucency in a rectangular box shape with an open front surface and upper surface. The holder 22 holds the display panel 20 and the light guide plate 21 such that the display panel 20 is disposed in front of the light guide plate 21 (see FIGS. 2 and 3).

[0025] The display block 2 is attached to the main body 1 so as to cover the remaining portion of the opening of the main body 1 excluding the upper portion to which 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 is incident on the light guide plate 21 from the incident surface 210 of the light guide plate 21. The light incident on the light guide plate 21 can be totally reflected at the rear surface of the holder 22 while traveling inside the light guide plate 21 and emitted forward from the emission surface 211 of the light guide plate 21 to illuminate the display panel 20.

[0026] (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 up-down, front-back, and left-right directions indicated by the arrows in FIG. 6 are defined as the up-down, front-back, and left-right directions of the light source unit A1, respectively.

[0027] (2-2-1) Light emitting block The light emitting block 3 includes a light emitting portion 30, a heat dissipation member 31, a fixture 32, and a heat conduction member 33 (see FIGS. 6 and 7).

[0028] The light emitting portion 30 includes an LED 300 which is a solid light source, and a substrate 301 on which the LED 300 is mounted. The LED 300 is, for example, a packaged white LED for lighting. 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.

[0029] The heat dissipation member 31 includes a heat dissipation plate 310, a coupling portion 311 that thermally couples to the back surface of the substrate 301, and two protrusions 312. The heat dissipation plate 310 and the coupling portion 311 are each formed in a rectangular flat plate shape. However, the heat dissipation 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. Also, the coupling portion 311 is integrally formed with the heat dissipation plate 310 so as to protrude in the thickness direction (front-back direction) of the heat dissipation plate 310. In other words, the heat dissipation member 31 is formed in a substantially L shape by the heat dissipation plate 310 and the coupling portion 311 (see FIG. 6).

[0030] The two protrusions 312 are each formed integrally with the heat dissipation plate 310 by raising a part of the heat dissipation plate 310 (see FIGS. 6 and 7A). Each protrusion 312 is formed in a substantially trapezoidal shape when viewed in the front-rear direction. One end of each protrusion 312 (the part corresponding to the lower base of the trapezoid) is connected to the heat dissipation plate 310. And each protrusion 312 is configured to be displaceable (flexible) in the front-rear direction with one end connected to the heat dissipation plate 310 as a fulcrum.

[0031] 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 dissipation plate 310 (see FIGS. 6 and 7A). These two holes 313 penetrate the heat dissipation plate 310 in the thickness direction (front-rear direction).

[0032] The heat conduction member 33 is formed in a square shape, for example, of a sheet-like silicone resin (see FIG. 6). The heat conduction 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 dissipation member 31 through the heat conduction member 33.

[0033] 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 portion 323, and the pair of claws 324 are integrally formed of a synthetic resin material.

[0034] The main body portion 320 is formed in a U shape. Each of the pair of claws 324 is formed in a truncated pyramid shape. The pair of claws 324 are provided one by one on the inner surfaces at both ends of the main body portion 320.

[0035] The first tab 321 is formed in a rectangular flat plate shape. The first tab 321 faces the front end of the main body 320 (see FIG. 7C). The second tab 322 is formed in a C shape in plan view (see FIG. 6). The second tab 322 faces the rear end of the main body 320 (see FIG. 7C). Note that the first tab 321 and the second tab 322 each protrude in the same direction (the right direction in FIG. 6) as both ends of the main body 320.

[0036] Each of the pair of pressing parts 323 is formed in a rectangular parallelepiped shape (see FIG. 6). The pair of pressing parts 323 protrude from the inner surface (left side surface) of the main body 320.

[0037] Thus, the fixture 32 arranges the coupling part 311 between the first tab 321 and the second tab 322, and hooks one pair of claws 324 on the upper end and the lower end of the substrate 301 one by one, thereby fixing the light emitting part 30 to the heat dissipation member 31 (see FIG. 7B). Note that the fixture 32 pushes the coupling part 311 in the direction approaching the substrate 301 (leftward) by the pair of pressing parts 323, thereby increasing the degree of adhesion between the coupling part 311 and the substrate 301 and the heat conduction member 33.

[0038] (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.

[0039] 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 (lower surface) serves as the emission surface 51. Further, a large number of concave grooves 54 are provided on the side surface (upper surface) facing the emission surface 51 of the light guide 5. These concave grooves 54 are arranged in parallel so that the distance between adjacent concave grooves 54 becomes narrower as the distance from the incident surface 50 increases (see FIG. 8B).

[0040] Of the four side surfaces of the light guide 5, a plurality (four in the illustrated example) of fitting portions 53 are provided on two side surfaces 52 (front surface and rear surface) adjacent to the emission surface 51. The four fitting portions 53 are provided in two on each of the two side surfaces 52 (see FIGS. 8A and 8C). Among the fitting portions 53 provided in two 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.

[0041] 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 than the lower surfaces of the two first fitting portions 53A.

[0042] The two second fitting portions 53B have a quadrangular prism-shaped protrusion 530 with a trapezoidal bottom surface and a rectangular parallelepiped-shaped boss 531 extending straight up from the upper end of the protrusion 530 (see FIGS. 6 and 8). The upper surface of the boss 531 is a downward inclined surface.

[0043] (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 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.

[0044] 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 so that the incident surface 50 is exposed from the right side surface and the emission surface 51 is exposed from the lower surface (see FIG. 5).

[0045] The accommodating portion 43 has a rear plate 430, an upper plate 431, a front plate 432, and side plates 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 plates 433 are formed in a rectangular flat plate shape and are 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.

[0046] Here, two fitting portions 4300 are provided on the rear plate 430 (see FIG. 6). The two fitting portions 4300 are each formed of a quadrangular hole. The fitting portions (the first fitting portion 53A and the second fitting portion 53B) provided on the rear side surface 52 of the light guide 5 are respectively fitted into these two fitting portions 4300.

[0047] 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 longitudinal length (left-right direction) of the front plate 432 is shorter than the longitudinal length of the heat sink 310 (see FIGS. 6 and 10). Note that the distance along the front-rear direction between the rear plate 430 and the front plate 432 is equal to the distance along the front-rear direction between the rear plate 430 and the rib 4330 (see FIG. 10).

[0048] 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).

[0049] The pair of protrusions 440 are provided on the inner surface (left side surface) of the right 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).

[0050] 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 side wall 42 (see Figs. 6 and 10).

[0051] 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).

[0052] The fitting portion 443 is provided at the upper part of the right end on the rear surface of the front wall 40 (see Fig. 10). The fitting portion 443 is formed in a triangular prism shape. The fitting portion 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).

[0053] The plurality (two in this embodiment) of positioning portions 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 portion 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 vertical direction and they are parallel to each other with a gap of a certain width (see Fig. 9). Note that the width of the gap in each positioning portion 45 is slightly larger than the width in the left-right direction of the fitting portion 53 of the light guide 5.

[0054] Into the gap of the positioning portion 45 on the right side, the fitting portion 53 (first fitting portion 53A) on the right side of the front side surface 52 of the light guide 5 fits (see FIGS. 9 and 10). Further, into the gap of the positioning portion 45 on the left side, the fitting portion 53 (second fitting portion 53B) on the left side of the front side surface 52 of the light guide 5 fits (see FIG. 9). That is, the two positioning portions 45 serve to position the light guide 5 accommodated in the accommodating portion 43 in the left-right direction with respect to the housing 4.

[0055] The pair of support pieces 47 project rearward one by one from both left and right ends of the upper wall 41. Further, the pair of attachment pieces 46 project rearward one by one from both left and right ends of the upper wall 41. However, each attachment piece 46 is located inside each support piece 47 (see FIG. 6).

[0056] (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 the order of some procedures can be changed.

[0057] First, an operator performing the assembly work inserts the light guide 5 into the accommodating portion 43 from the lower surface of the accommodating 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. At this time, when the upper ends of the first fitting portion 53A and the second fitting portion 53B on the rear side surface 52 of the light guide 5 hit the lower end of the rear plate 430 of the accommodating portion 43, the rear plate 430 bends backward. Eventually, 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.

[0058] In this way, the operator accommodates the light guide 5 in the accommodating portion 43 of the housing 4. And the light guide 5 accommodated in the accommodating portion 43 is prevented from falling off the accommodating portion 43 by the two fitting portions 53 (first fitting portion 53A, second fitting portion 53B) being respectively fitted into the two fitting portions 4300.

[0059] 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 dissipation 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 dissipation plate 310 of the heat dissipation member 31 from below the housing 4 into the gap between the front wall 40 and the front plate 432.

[0060] Then, when the upper end of the heat dissipation plate 310 gets over the fitting portion 443 and the fitting portion 443 fits into the upper hole 313 of the heat dissipation plate 310, the heat dissipation member 31 is prevented from coming off the housing 4 (see FIG. 11). Also, the forward and backward movement and the left and right movement of the fixture 32 are restricted by the pair of protrusions 440, the pressing piece 441, and the abutting piece 442 of the attachment portion 44 (see FIG. 10). In this way, the operator can attach the light-emitting block 3 to the attachment portion 44.

[0061] 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 electrode 302 is provided) protrudes rearward from the pressing piece 441 of the housing 4 (see FIG. 5).

[0062] (2-4) Construction procedure of the display device according to the embodiment Next, the construction procedure of the display device B1 will be described.

[0063] First, after the operator draws in the power line through the power supply hole 15 provided on the bottom surface of the main body 1 (see FIG. 2), the operator attaches the main body 1 to the wall surface with wood screws or wall plugs.

[0064] Subsequently, the operator electrically connects the power line drawn in from 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).

[0065] 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).

[0066] In this way, the installation of the display device B1 is completed.

[0067] (3) Others The light source unit A1 may include two light emitting blocks 3. The two light emitting blocks 3 are arranged one by one at both ends in the longitudinal direction of the light guide 5. In this case, one mounting portion 44 is provided at each end in the longitudinal direction of the housing 4.

[0068] Also, the display device B1 may be configured such that a set of the light emitting block 3 and the display block 2 is attached to each of the front surface and the rear surface of the main body 1.

[0069] (4) Advantages of the light source unit according to the embodiment As described above, the light source unit A1 has a heat radiating member 31 that is thermally coupled to the light emitting portion 30. The heat radiating member 31 has a heat radiating plate 310 disposed in the housing 4 along the longitudinal direction (left - right direction) of the light guide 5.

[0070] The heat generated by the LED 300 of the light emitting portion 30 is conducted from the substrate 301 through the heat conducting member 33 to the coupling portion 311 of the heat radiating member 31, and further conducted from the coupling portion 311 to the heat radiating plate 310.

[0071] Thus, the light source unit A1 can improve heat dissipation by dissipating the heat generated by the light emitting unit 30 (the LED 300 thereof) through the heat dissipation member 31 that is thermally coupled to the light emitting unit 30. Moreover, since the light source unit A1 arranges the heat dissipation plate 310 of the heat dissipation member 31 in the housing 4 along the longitudinal direction of the light guide 5 (see FIG. 5), it is possible to improve heat dissipation by effectively using the space in the housing 4. As a result, the light source unit A1 can suppress a decrease in the luminous efficiency of the light emitting unit 30 due to a temperature rise. Further, by suppressing a decrease in the luminous efficiency, the light source unit A1 can obtain the amount of light necessary for illuminating the display panel 20 even with a single light emitting unit 30.

[0072] Here, the width of the gap between the front wall 40 and the front plate 432 where the heat dissipation plate 310 is disposed is larger than the thickness of the heat dissipation plate 310. Therefore, the light source unit A1 can further improve the heat dissipation of the heat dissipation plate 310 by generating convection in this space by forming a space between the heat dissipation plate 310 and the front plate 432 (see FIG. 10).

[0073] Furthermore, the light source unit A1 restricts the movement of the heat dissipation member 31 in the thickness direction (front-rear direction) of the heat dissipation plate 310 by the protrusion 312 provided on the heat dissipation plate 310. As a result, the light source unit A1 can suppress the displacement and inclination of the light emitting unit 30 and the incident surface 50 of the light guide 5 that are coupled to the heat dissipation member 31. In the light source unit A1, the tip of the protrusion 312 may always contact the front plate 432 or may not contact the front plate 432.

[0074] Also, the protrusion 312 is formed to be displaceable (flexible) with respect to the heat dissipation plate 310 by raising a part of the heat dissipation plate 310. Thus, the light source unit A1 can make it difficult for the front plate 432 to be deformed or shaved when the protrusion 312 contacts the front plate 432 as compared with the case where the protrusion is made non-displaceable with respect to the heat dissipation plate 310.

[0075] (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 (4), and a heat radiating member (31). The light guide (5) is formed in a long shape and guides the light emitted by the light emitting portion (30). The housing (4) supports the light guide (5) 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 heat radiating member (31) is thermally coupled to the light emitting portion (30). The heat radiating member (31) has a heat radiating plate (310) disposed in the housing (4) along the longitudinal direction of the light guide (5).

[0076] The light source unit (A1) according to the first aspect can improve heat dissipation by dissipating the heat generated by the light emitting portion (30) with the heat radiating member (31) thermally coupled to the light emitting portion (30). Moreover, in the light source unit (A1) according to the first aspect, since the heat radiating plate (310) included in the heat radiating member (31) is disposed in the housing (4) along the longitudinal direction of the light guide (5), it is possible to effectively utilize the space in the housing (4) to improve heat dissipation.

[0077] 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, it is preferable that the light emitting portion (30) includes one or more solid light sources (LED 300) and a substrate (301) having the solid light sources mounted on the surface. It is preferable that the heat radiating member (31) further has a coupling portion (311) thermally coupled to the back surface of the substrate (301).

[0078] The light source unit (A1) according to the second aspect can efficiently conduct the heat generated by the solid light source to the heat radiating member (31) by thermally coupling the coupling portion (311) of the heat radiating member (31) to the substrate (301) of the light emitting portion (30). As a result, the light source unit (A1) according to the second aspect can further improve heat dissipation.

[0079] The light source unit (A1) according to the third aspect of the present disclosure can be realized by combination with the second aspect. The light source unit (A1) according to the third aspect preferably further includes a fixture (32). The fixture (32) fixes the coupling portion (311) of the heat dissipation member (31) to the substrate (301) of the light emitting portion (30).

[0080] The light source unit (A1) according to the third aspect can improve the coupling strength between the coupling portion (311) and the substrate (301) by the fixture (32).

[0081] The light source unit (A1) according to the fourth aspect of the present disclosure can be realized by combination with the third aspect. In the light source unit (A1) according to the fourth aspect, the housing (4) preferably includes an attachment portion (44) to which the light emitting portion (30) and the heat dissipation member (31) fixed by the fixture (32) are attached.

[0082] The light source unit (A1) according to the fourth aspect can improve the workability of the work of attaching the light emitting portion (30) and the heat dissipation member (31) to the housing (4) as compared with the case where the light emitting portion (30) and the heat dissipation member (31) are separately attached to the housing (4).

[0083] The light source unit (A1) according to the fifth aspect of the present disclosure can be realized by combination with the third or fourth aspect. In the light source unit (A1) according to the fifth aspect, the coupling portion (311) is preferably formed integrally with the heat dissipation plate (310) so as to protrude in the thickness direction of the heat dissipation plate (310).

[0084] The light source unit (A1) according to the fifth aspect can improve the heat conduction efficiency from the coupling portion (311) to the heat dissipation plate (310) by forming the coupling portion (311) integrally with the heat dissipation plate (310). Further, since the coupling portion (311) protrudes in the thickness direction of the heat dissipation plate (310) in the light source unit (A1) according to the fifth aspect, miniaturization of the heat dissipation member (31) can be achieved.

[0085] The light source unit (A1) according to the sixth aspect of the present disclosure can be realized by a combination with any of the first to fifth aspects. In the light source unit (A1) according to the sixth aspect, it is preferable that the housing (4) further includes a housing portion (43) that houses the light guide (5).

[0086] By providing the housing (4) with the housing portion (43) that houses the light guide (5), the light source unit (A1) according to the sixth aspect can improve the workability of the assembly work.

[0087] The light source unit (A1) according to the seventh aspect of the present disclosure can be realized by a combination with any of the first to sixth aspects. In the light source unit (A1) according to the seventh aspect, it is preferable that the heat sink (310) has one or more protrusions (312) protruding in the thickness direction of the heat sink (310).

[0088] The light source unit (A1) according to the seventh aspect can suppress the displacement and inclination of the light emitting portion (30) and the light guide (5) coupled to the heat radiating member (31) by restricting the movement of the heat sink (310) in the thickness direction by the protrusion (312).

[0089] The light source unit (A1) according to the eighth aspect of the present disclosure can be realized by a combination with the seventh aspect. In the light source unit (A1) according to the eighth aspect, it is preferable that the protrusion (312) is formed so as to be displaceable with respect to the heat sink (310).

[0090] The light source unit (A1) according to the eighth aspect can make it difficult for the housing (4) to be deformed or shaved when the protrusion (312) hits the housing (4) as compared with the case where the protrusion is made non-displaceable with respect to the heat sink (310).

[0091] The display device (B1) according to the ninth aspect of the present disclosure includes any of the first to eighth light source units (A1), 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).

[0092] The display device (B1) according to the ninth aspect can improve the heat dissipation performance in the light source unit (A1).

Explanation of Signs

[0093] A1 Light source unit B1 Display device 1 Main body 4 Housing 5 Light guide 20 Display panel 30 Light emitting part 31 Heat dissipation member 32 Fixture 43 Accommodating part 44 Mounting part 300 LED (Solid light source) 301 Substrate 310 Heat sink 311 Coupling part 312 Protrusion

Claims

1. One or more light-emitting parts that emit light, A light guide formed in a long shape for guiding the light emitted by the light-emitting part, A housing that supports the light guide and the light-emitting part with the light-emitting part disposed at one or both ends in the longitudinal direction of the light guide, A heat dissipation member thermally coupled to the light-emitting part, Having, The light-emitting part is, One or more solid-state light sources, A substrate with the solid-state light source mounted on its surface, Having, The heat dissipation member has a heat dissipation plate disposed in the housing along the longitudinal direction of the light guide, and a coupling part that is thermally coupled to the back surface of the substrate, The light source unit further has a fixture for fixing the coupling part of the heat dissipation member to the substrate of the light-emitting part, The fixture is, A U-shaped main body part, Claws provided one by one at both ends of the main body part, A first protruding piece and a second protruding piece provided on the main body part so as to sandwich the main body part from the front-rear direction, Having, The fixture arranges the coupling part between the first protruding piece and the second protruding piece, and fixes the coupling part to the substrate by hooking the claws one by one on both ends of the substrate, Light source unit.

2. The housing is, A housing part for housing the light guide, An attachment part to which the light-emitting part fixed by the fixture and the heat dissipation member are attached, Further comprising, The heat dissipation plate has one or more protruding parts protruding in the thickness direction of the heat dissipation plate toward the housing part in the housing, The protruding part restricts the movement of the heat dissipation plate by hitting the housing part, The light source unit according to Claim 1.

3. The coupling part is integrally formed with the heat dissipation plate so as to protrude in the thickness direction of the heat dissipation plate, The light source unit according to Claim 1 or 2.

4. The protruding part is formed so as to be displaceable with respect to the heat dissipation plate with one end connected to the heat dissipation plate as a fulcrum, The light source unit according to Claim 2.

5. Any one of the light source units according to Claims 1 to 4, A display panel illuminated by the light source unit, A main body that holds the display panel and the light source unit, Comprising, Display device.

6. A power supply device that lights the light source unit with commercial power supplied from a commercial power source, A battery unit that is charged by the power supply device and supplies emergency power to the power supply device to light the light source unit when a power outage occurs in the commercial power source, Further comprising, The power supply device and the battery unit are housed in the main body, The display device according to Claim 5.

7. The display panel is configured to display a pictogram for evacuation guidance. The display device according to claim 5 or 6.

Images