JP7713666B2 - Light source unit and display device - Google Patents

Description

The present disclosure relates to a light source unit and a display device, and more specifically to a light source unit that guides light emitted from a light source using a light guide, and a display device having the light source unit.

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) has a point light source made of an LED, a linear light guide that guides light incident from the point light source to an entrance surface, and a planar light guide that guides light emitted from an exit surface of the linear light guide.

JP 2004-349030 A

However, in the above conventional example, it is desirable for the member supporting the linear light guide to be easy to assemble.

The objective of this disclosure is to provide a light source unit and a display device that can improve assembly.

A light source unit according to one aspect of the present disclosure includes one or more light-emitting parts that emit light, and a light guide formed in an elongated shape that guides the light emitted by the light-emitting parts. The light source unit includes a storage section that stores the light guide, and a housing that supports the storage section and the light-emitting parts in a state in which the light-emitting parts are disposed at one or both ends in the longitudinal direction of the light guide. The storage section has a wall that faces one side surface of the light guide in the lateral direction along the longitudinal direction of the light guide. The light guide has a plurality of fitting sections provided on the side surface that faces the wall. The wall has the same number of fitted parts as the fitting parts, which fit into the plurality of fitting parts one by one. Of 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 according to one aspect of the present disclosure includes one or more light-emitting units that emit light, a light guide formed in an elongated shape that guides the light emitted by the light-emitting units, a storage section that stores the light guide, and a housing that supports the storage section and the light-emitting units in a state in which the light-emitting units are arranged at one or both ends in the longitudinal direction of the light guide. The storage section has a wall that faces one side surface of the light guide in the lateral direction along the longitudinal direction of the light guide, and is configured to open the other side surface of the light guide in the lateral direction and the emission surface of the light guide. The light guide has one or more fitting sections provided on the side surface that faces the wall. The wall has one or more fitted portions that fit with the fitting sections. The fitting sections are formed so as to protrude from the side surface that faces the wall toward the wall along the lateral direction of the light guide.

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.

The light source unit and display device disclosed herein have the advantage of being easier to assemble.

FIG. 1 is a perspective view of a display device according to an embodiment of the present disclosure. FIG. 2 is an exploded perspective view of the display device. FIG. 3 is a perspective view of the display device with a light source unit removed. FIG. 4 is a cross-sectional view of a main part of the display device. FIG. 5 is a rear perspective view of a light source unit according to an embodiment of the present disclosure. FIG. 6 is an exploded perspective view of the light source unit as viewed from the rear. 7A, 7B and 7C are front, right and left side views of the light-emitting block in the light source unit of the above embodiment; 8A is a front view of the light guide in the light source unit, FIG 8B is a plan view of the light guide, and FIG 8C is a right side view of the light guide. FIG. 9 is a bottom view of the light source unit. FIG. 10 is a bottom view of a main part of the light source unit. FIG. 11 is a cross-sectional view of the light source unit. FIG. 12 is a cross-sectional view of the light source unit of the above with a portion thereof omitted. FIG. 13 is a cross-sectional view of the light source unit of the above with a portion thereof omitted. FIG. 14 is a cross-sectional view of the display device shown in FIG.

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 figure described in the following embodiments is a schematic diagram, and the respective ratios of the size and thickness of each component do not necessarily reflect the actual dimensional ratios. Note that the configuration described in the following embodiments is merely one example of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

(1) Overview of the embodiment (1-1) Overview of the light source unit according to the embodiment The light source unit A1 according to the embodiment has one or more light emitting units 30 that emit light, a light guide 5, a storage section 43, and a housing 4 (see FIG. 6). The light guide 5 is formed long and guides the light emitted by the light emitting units 30. The storage section 43 stores the light guide 5. The housing 4 supports the storage section 43 and the light emitting units 30 in a state in which the light emitting units 30 are arranged at one end or both ends of the longitudinal direction of the light guide 5. The storage section 43 has a wall (rear plate 430) that faces one side surface 52 in the lateral 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.

In the light source unit A1 according to the embodiment, the light guide 5 has a fitting portion 53 that fits into the fitting portion 4300 provided on the wall (rear panel 430), so that the light guide 5 housed in the housing portion 43 can be prevented from falling off without the need for glueing or other operations, improving assembly.

(1-2) Overview of the display device according to the embodiment The display device B1 according to the embodiment includes a 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).

The display device B1 according to the embodiment can be easily assembled due to the improved assembly of the light source unit A1 according to the embodiment.

(2) Details of the embodiment (2-1) Configuration of the display device according to the embodiment A display device B1 according to the embodiment (hereinafter, abbreviated as display device B1) will be described with reference to the drawings. The display device B1 described below is an emergency exit or a passage to an emergency exit in a building such as an office or a store. However, the display device according to the embodiment is not limited to emergency exits, and may be used, for example, to display a specific location (such as a restroom) in 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.

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

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

The power supply device 11 lights the light source unit A1 with normal power supplied from a normal power source (e.g., a commercial power system) and charges the battery unit 13. In addition, in the event of 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.

The mounting plate 10 is formed into a plate shape from a metal material (see Figure 2). The mounting plate 10 is screwed to the inner bottom surface of the main body 1. The power supply unit 11 and terminal block 12 are screwed to the mounting plate 10 and housed within the main body 1. The battery unit 13 is detachably attached to the mounting plate 10.

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

The display panel 20 is formed in a rectangular flat plate shape from a translucent synthetic resin material such as acrylic resin or polycarbonate resin. However, the display panel 20 may be formed from a translucent material 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).

The light guide plate 21 is formed in a rectangular flat plate shape from a translucent synthetic resin material 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 (exit surface 211) of the light guide plate 21. The display panel 20 is illuminated by the light exiting from the exit surface 211 of the light guide plate 21.

The holder 22 is made of a non-translucent synthetic resin material and is formed into a rectangular box shape with an open front and top. The holder 22 holds the display panel 20 and the light guide plate 21 such that the display panel 20 is positioned in front of the light guide plate 21 (see Figures 2 and 3).

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 except for the upper part where the light source unit A1 is attached (see Figs. 1 and 3). When the light source unit A1 is attached to the main body 1, the incident surface 210 of the light guide plate 21 and the exit 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 exit 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 enters the light guide plate 21 is totally reflected by the rear surface of the holder 22 while traveling inside the light guide plate 21, and is emitted forward from the exit surface 211 of the light guide plate 21 to illuminate the display panel 20.

(2-2) Configuration of Light Source Unit According to the Embodiment The light source unit A1 has 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 arrows in Fig. 6 are defined as the up-down, front-back, and left-right directions of the light source unit A1.

(2-2-1) Light Emitting Block The light emitting block 3 has a light emitting portion 30, a heat dissipation member 31, a fixing member 32, and a heat conducting member 33 (see FIGS. 6 and 7).

The light-emitting unit 30 has 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 lighting. The substrate 301 is a printed wiring board formed in a substantially T-shape when viewed from the left and right (see Figures 6 and 7B). The LED 300 is mounted on the surface of the wide portion of the substrate 301. A pair of electrodes 302 is 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.

The heat dissipation member 31 has a heat dissipation plate 310, a connecting portion 311 that is thermally connected to the rear surface of the substrate 301, and two protrusions 312. The heat dissipation plate 310 and the connecting 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 connecting portion 311 is formed to be smaller than the substrate 301. The connecting portion 311 is formed integrally with the heat dissipation plate 310 so as to protrude in the thickness direction (front-rear 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 connecting portion 311 (see FIG. 6).

The two protrusions 312 are each formed integrally with the heat sink 310 by cutting and raising a portion of the heat sink 310 (see Figures 6 and 7A). When viewed from the front-to-rear direction, each protrusion 312 is formed in a substantially trapezoidal shape. One end of each protrusion 312 (the portion corresponding to the lower base of the trapezoid) is connected to the heat sink 310. Each protrusion 312 is configured to be displaceable (flexible) in the front-to-rear direction with the end connected to the heat sink 310 as a fulcrum.

In addition, one square hole 313 is provided at the center of each of the short sides (up-down direction) and long sides (left-right direction) of the heat sink 310 (see Figures 6 and 7A). These two holes 313 each penetrate the heat sink 310 in the thickness direction (front-back direction).

The heat conducting member 33 is formed, for example, in a rectangular shape from a sheet of silicone resin (see FIG. 6). The heat conducting member 33 is interposed between the joint 311 and the substrate 301, and thermally couples the joint 311 and the substrate 301. In other words, the heat generated in the LED 300 is conducted from the substrate 301 to the heat dissipation member 31 via the heat conducting member 33.

The fixing device 32 has a main body 320, a first protrusion 321, a second protrusion 322, a pair of holding parts 323, and a pair of claws 324 (see Figures 6 and 7). The main body 320, the first protrusion 321, the second protrusion 322, the holding parts 323, and the pair of claws 324 are integrally formed from a synthetic resin material.

The main body 320 is formed in a U-shape. Each of the pair of claws 324 is formed in a pyramidal shape. The pair of claws 324 is provided on the inner surface at each end of the main body 320, one on each side.

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

The pair of pressing parts 323 are each 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 part 320.

Thus, the fixture 32 places the connecting portion 311 between the first protrusion 321 and the second protrusion 322, and hooks a pair of claws 324 onto the upper and lower ends of the substrate 301, thereby fixing the light-emitting portion 30 to the heat dissipation member 31 (see FIG. 7B). The fixture 32 uses a pair of pressing portions 323 to push the connecting portion 311 in a direction approaching the substrate 301 (to the left), thereby increasing the degree of adhesion between the connecting portion 311 and the substrate 301 and the heat-conducting member 33.

(2-2-2) Light Guide The light guide 5 is made of a synthetic resin material having translucency, such as acrylic resin or polycarbonate resin, and is formed into a square prism shape (see Figs. 6 and 8). However, the shape of the light guide 5 is not limited to a square prism shape, and may be a square pyramid shape or a square frustum shape.

Of the two bottom surfaces (left and right bottom surfaces) that face 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. In addition, of the four side surfaces (front, rear, top, bottom surfaces) of the light guide 5, one side surface (bottom surface) serves as the exit surface 51. Furthermore, the side surface (top surface) of the light guide 5 that faces the exit surface 51 has a large number of grooves 54. These grooves 54 are arranged in parallel such that the spacing between adjacent grooves 54 becomes narrower as the distance from the incident surface 50 increases (see FIG. 8B).

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

The two first fitting portions 53A are formed in the shape of a rectangular prism with a trapezoidal bottom surface. However, the upper surfaces of the two first fitting portions 53A form smaller angles with the side surface 52 than the lower surfaces of the two first fitting portions 53A.

The two second fitting parts 53B each have a rectangular prism-shaped protrusion 530 with a trapezoidal bottom surface and a rectangular parallelepiped protrusion 531 that extends straight up from the top end of the protrusion 530 (see Figures 6 and 8). The top surface of the protrusion 531 is a downwardly inclined surface.

(2-2-3) Housing The housing 4 has a front wall 40, an upper wall 41, a pair of side walls 42, a storage section 43, an attachment section 44, a plurality of positioning sections 45, a pair of attachment 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. The pair of side walls 42 are each formed in a rectangular flat plate shape and protrude rearward from both left and right ends of the front wall 40. The upper ends of the pair of side walls 42 are connected to both ends of the upper wall 41 in the longitudinal direction. In other words, the housing 4 is formed in a long box shape with the rear and bottom open by the front wall 40, the upper wall 41, and the pair of side walls 42.

The storage section 43 is formed in a long box shape with the front, bottom, and right side open (see Figures 6 and 9). The storage section 43 stores the light guide 5 with the entrance surface 50 exposed from the right side and the exit surface 51 exposed from the bottom (see Figure 5).

The storage section 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 whose longitudinal length is approximately 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 faces of the rear plate 430 and the upper plate 431 (see Fig. 6). A rib 4330 protrudes to the right from the front end of the side plate 433. The distance between the rear plate 430 and the rib 4330 in the front-rear direction is slightly larger than the thickness of the light guide 5 in the front-rear direction.

Here, the rear plate 430 has two mating portions 4300 (see FIG. 6). Each of the two mating portions 4300 is formed as a rectangular hole. These two mating portions 4300 are mated with mating portions (first mating portion 53A, second mating portion 53B) provided on the rear side surface 52 of the light guide 5, one each.

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 Figures 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 Figures 6 and 10). The distance between the rear plate 430 and the front plate 432 in the longitudinal direction is equal to the distance between the rear plate 430 and the rib 4330 in the longitudinal direction (see Figure 10).

The mounting 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 mount the light-emitting block 3 to the housing 4 (see Figures 6 and 10).

The pair of protrusions 440 are provided on the inner surface (left side surface) of the right side wall 42 of the pair of side walls 42 (see FIG. 6). The pair of protrusions 440 are formed in a columnar shape with the axial direction being the up-down direction. The pair of protrusions 440 protrude from the inner surface of the side wall 42 so as to be aligned in parallel with a certain distance therebetween in the front-rear direction. The distance between the pair of protrusions 440 in the front-rear direction is slightly larger than the width dimension of the main body 320 of the fixing device 32 (see FIG. 10).

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

The abutment piece 442 is provided at the right end of the rear plate 430 (see FIG. 6). The abutment piece 442 is L-shaped when viewed from the top-bottom direction, and is formed integrally with the rear plate 430 so as to protrude rearward and rightward from the right end of the rear plate 430 (see FIG. 6 and FIG. 10).

The fitting portion 443 is provided at the upper right end of 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 so that its 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 top wall 41 (see FIG. 11).

The multiple positioning portions 45 (two in this embodiment) are provided on both the left and right sides of the rear surface of the rear plate 430 (see Figures 6 and 9). Each positioning portion 45 has a pair of rectangular parallelepipeds. The pair of rectangular parallelepipeds protrude rearward from the rear surface of the rear plate 430 so that their axial directions coincide with the up-down direction and they are aligned in parallel with a certain gap (see Figure 9). The width of the gap in each positioning portion 45 is slightly larger than the left-right width of the fitting portion 53 of the light guide 5.

The right fitting portion 53 (first fitting portion 53A) on the front side surface 52 of the light guide 5 fits into the gap of the right positioning portion 45 (see Figures 9 and 10). Also, the left fitting portion 53 (second fitting portion 53B) on the front side surface 52 of the light guide 5 fits into the gap of the left positioning portion 45 (see Figure 9). In other words, the two positioning portions 45 serve to position the light guide 5 housed in the housing portion 43 in the left-right direction with respect to the housing 4.

The pair of support pieces 47 protrude rearward, one each from the left and right ends of the upper wall 41. The pair of mounting pieces 46 protrude rearward, one each from the left and right ends of the upper wall 41. However, each mounting piece 46 is located inward from each of the support pieces 47 (see Figure 6).

(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 will be omitted. In addition, the assembly procedure described below is an example, and the order of some steps can be changed.

First, the worker performing the assembly work inserts the light guide 5 into the storage section 43 from the underside of the storage section 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 gaps between the two positioning portions 45.

Here, the upper surface of the first fitting portion 53A and the upper surface of the protrusion 530 of the second fitting portion 53B are inclined so that the height from the side surface 52 decreases as it goes upward (see Figures 12 and 13). Therefore, when the upper surface of the first fitting portion 53A and the upper surface of the protrusion 530 of the second fitting portion 53B hit the lower end of the rear plate 430 of the storage portion 43 during the process of inserting the light guide 5 into the storage portion 43 by the operator, the rear plate 430 bends backward.

When the operator inserts the light guide 5 until it hits the upper plate 431 of the storage section 43, the protrusions 530 of the first fitting section 53A and the second fitting section 53B each fit into one of the two fitted sections 4300 provided on the rear plate 430, and the rear plate 430 returns to its original state (see Figures 12 and 13).

In this way, the worker stores the light guide 5 in the storage section 43 of the housing 4. The light guide 5 stored in the storage section 43 is prevented from falling out of the storage section 43 by the two fitting sections 53 (the first fitting section 53A and the second fitting section 53B) fitting into the two fitted sections 4300, one each.

Next, the worker attaches the light-emitting block 3 to the mounting portion 44 of the housing 4. That is, the worker inserts the light-emitting unit 30, the fixture 32, and the joint portion 311 of 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 worker inserts the main body portion 320 of the fixture 32 between the pair of protrusions 440. At the same time, the worker inserts the heat dissipation plate 310 of the heat dissipation member 31 into the gap between the front wall 40 and the front plate 432 from below the housing 4.

Then, the upper end of the heat sink 310 climbs over the fitting portion 443, and the fitting portion 443 fits into the upper hole 313 of the heat sink 310, preventing the heat sink 31 from coming loose from the housing 4 (see FIG. 11). In addition, the pair of protrusions 440, the pressing piece 441, and the abutment piece 442 of the mounting portion 44 restrict the movement of the fixing device 32 in the front-rear and left-right directions (see FIG. 10). In this way, the worker can attach the light-emitting block 3 to the mounting portion 44.

In this manner, the assembly of the light source unit A1 is completed. Note that in the assembled light source unit A1, the narrow end portion (where the electrode 302 is provided) of the substrate 301 of the light-emitting section 30 protrudes rearward beyond the pressing piece 441 of the housing 4 (see FIG. 5).

(2-4) Installation Procedure of Display Device According to the Embodiment Next, an installation procedure of the display device B1 will be described.

First, the worker performing the installation work pulls in the power cord from the power supply hole 15 (see Figure 2) on the bottom surface of the main body 1, and then attaches the main body 1 to the wall surface with wood screws or nails.

Next, the worker electrically connects the power line pulled in from the power hole 15 to the terminal block 12. Then, the worker attaches the display block 2 to the main body 1 (see Figure 3).

Finally, the worker attaches the light source unit A1 to the main body 1 by inserting the narrow portion of the board 301 into the connector 14 of the main body 1 and hooking the claws on the tips of the pair of mounting pieces 46 onto the edges of holes on the top surface of the main body 1 (see Figure 1).

This completes the installation of display device B1.

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

The display device B1 may also be configured so that one pair of light-emitting block 3 and display block 2 is attached to each of the front and rear surfaces of the main body 1.

(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 storage section 43 by engaging one or more engaging portions 53 provided on the side surface 52 of the light guide 5 with engaging portions 4300 provided on the wall (rear panel 430) of the storage section 43.

By accommodating the light guide 5 in the housing section 43, the light source unit A1 can prevent the light guide 5 from falling off from the housing section 43 without the need for additional work such as gluing, thereby improving assembly.

However, when the fitting portion is formed so as to be recessed from the side surface 52 of the light guide 5 in a direction away from the rear plate 430, the light traveling through the light guide 5 that reaches the fitting portion may be reflected at the interface of the fitting portion, emitted from the exit surface 51 of the light guide 5, and enter the light guide plate 21. When the light reflected at the interface of the fitting portion in this way enters the light guide plate 21, it may cause bright lines on the display panel 20 or uneven brightness on the display panel 20.

On the other hand, the light source unit A1 forms a fitting portion 53 that protrudes from the side surface 52 of the light guide 5 toward the rear plate 430 of the storage section 43. Therefore, of the light traveling through the light guide 5, the light that reaches the fitting portion 53 is not reflected at the interface of the fitting portion 53 and is emitted from the fitting portion 53 to the outside of the light guide 5 (see FIG. 14). Therefore, the light source unit A1 has the advantage that it is less likely to produce bright lines on the display panel 20.

In addition, the light source unit A1 uses a hole provided in the rear plate 430 of the housing portion 43 as the fitting portion 4300, so the fitting portion 4300 can be formed at the same time as the housing 4 is resin molded. Therefore, the light source unit A1 does not require a separate process for forming the fitting portion 4300, which further improves the ease of assembly.

Furthermore, the light source unit A1 has an upper surface of the fitting portion 53 that is an inclined surface that slopes along the direction (upward) in which the light guide 5 is accommodated in the accommodation portion 43 (see Figures 12 and 13). Therefore, when the light guide 5 is inserted upward from the lower surface of the accommodation portion 43, the rear plate 430 of the accommodation portion 43 can be deflected along the inclined surface of the fitting portion 53, allowing the fitting portion 53 to smoothly fit into the fitted portion 4300. As a result, the light source unit A1 can be further improved in ease of assembly.

The light guide 5 has two types of fitting portions 53, namely, a first fitting portion 53A and a second fitting portion 53B. 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 have approximately the same dimensions, and the first fitting portion 53A is smaller than the second fitting portion 53B by the amount of the protrusion 531.

By making the first fitting portion 53A, which is closer to the incident surface 50, relatively small, 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, thereby improving the light emission efficiency.

(5) Summary The light source unit (A1) according to the first aspect of the present disclosure has one or more light emitting units (30) that emit light, a light guide (5), a storage section (43), and a housing (4). The light guide (5) is formed long and guides the light emitted by the light emitting unit (30). The storage section (43) stores the light guide (5). The housing (4) supports the storage section (43) and the light emitting unit (30) in a state in which the light emitting unit (30) is disposed at one end or both ends in the longitudinal direction of the light guide (5). The storage section (43) has a wall (rear plate 430) that faces one side surface (52) in the lateral direction of the light guide (5) along the longitudinal direction of the light guide (5). The light guide (5) has one or more fitting sections (53) provided on the side surface (52) facing the wall. The wall has one or more mating portions (4300) that mate with the mating portions (53).

In the light source unit (A1) according to the first aspect, the light guide (5) has a fitting portion (53) that fits into the fitting portion (4300) provided on the wall (rear panel 430), so that the light guide 5 housed in the housing portion (43) can be prevented from falling off without the need for glueing or other operations, improving assembly.

The light source unit (A1) according to the second aspect of the present disclosure can be realized by combining it with the first aspect. In the light source unit (A1) according to the second aspect, it is preferable that the fitting portion (53) is formed so as to protrude from the side surface (52) toward the wall.

The light source unit (A1) according to the second aspect emits light that travels through the light guide (5) and reaches the fitting portion (53) 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 cause bright lines on the display panel (20).

The light source unit (A1) according to the third aspect of the present disclosure can be realized by combining it with the second aspect. In the light source unit (A1) according to the third aspect, it is preferable that the fitting portion (4300) is a hole provided in the wall.

The light source unit (A1) according to the third aspect can have the mating portion (4300) formed at the same time as the housing (4) is produced. As a result, the light source unit (A1) according to the third aspect does not require a separate process for forming the mating portion (4300), which further improves assembly.

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

The light source unit (A1) according to the fourth aspect can bend the rear plate (430) of the storage section (43) along the inclined surface of the fitting section (53) to smoothly fit the fitting section (53) into the fitted section (4300). As a result, the light source unit (A1) can be further improved in ease of assembly.

The light source unit (A1) according to the fifth aspect of the present disclosure can be realized by combining it with any one 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 fitted portions (4300) as the fitting portions (53). It is preferable that each of the plurality of fitting portions (53) fits one by one with the plurality of fitted portions (4300). Of the plurality of fitting portions (53), it is preferable that the fitting portion (first fitting portion 53A) closest to the light emitting portion (30) is smaller than the other fitting portions (second fitting portion 53B) excluding the fitting portion (first fitting portion 53A).

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

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).

The display device (B1) according to the sixth aspect can improve the assembly of the light source unit (A1).

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

Claims (6)

One or more light emitting units that emit light;
a light guide formed in an elongated shape and configured to guide the light emitted from the light emitting portion;
A housing portion that houses the light guide body;
a housing that supports the accommodation portion and the light emitting portion in a state in which the light emitting portion is disposed at one or both ends in a longitudinal direction of the light guide;
having
The housing portion has a wall that faces one side surface of the light guide in a short side direction along a longitudinal direction of the light guide,
the light guide body has a plurality of fitting portions provided on the side surface facing the wall,
the wall has fitted portions, the number of which is equal to the number of the fitting portions, each of which is fitted into the corresponding one of the 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.
Light source unit. The plurality of fitting portions are formed so as to protrude from the side surface toward the wall.
The light source unit according to claim 1 . The plurality of fitted portions are holes provided in the wall.
The light source unit according to claim 2. The plurality of fitting portions each have an inclined surface that is inclined along a direction in which the light guide is accommodated in the accommodation portion.
The light source unit according to claim 3. One or more light emitting units that emit light;
a light guide formed in an elongated shape and configured to guide the light emitted from the light emitting portion;
A housing portion that houses the light guide body;
a housing that supports the accommodation portion and the light emitting portion in a state in which the light emitting portion is disposed at one or both ends in a longitudinal direction of the light guide;
having
the housing portion has a wall along a longitudinal direction of the light guide body, the wall facing one side surface of the light guide body in a lateral direction, and is configured to open the other side surface of the light guide body in the lateral direction and an exit surface of the light guide body,
The light guide has one or more fitting portions provided on the side surface facing the wall,
the wall has one or more fitted portions that fit with the fitting portion,
The fitting portion is formed so as to protrude from the side surface facing the wall along a short-side direction of the light guide body toward the wall.
Light source unit. A light source unit according to any one of claims 1 to 5,
a display panel illuminated by the light source unit;
a main body for holding the display panel and the light source unit;
Equipped with
Display device.