Indication device

Abstract

To provide a display device in which a light source unit hardly falls off from a main body.SOLUTION: A display device B1 comprises a light source unit A1, a display block 2, and a main body 1. The light source unit A1 has a light source and a housing 4 receiving the light source. The display block 2 includes a display panel 20 that is lighted by the light emitted from the light source. The main body 1 detachably holds the light source unit A1 and the display block 2. The light source unit A1 is held on the main body 1i n a state that the inner surface 400 of the housing 4 covers at least one side face of the edge part of the display block 2. The housing 4 has a first part S1 in the inner surface 400. The display block 2 has a second part S2 in one side face, which can engage with the first part S in the above state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure generally relates to a display device, and more particularly to a display device in which a light source unit is held by a main body. [Background technology]

[0002] Patent Document 1 discloses a display device such as an emergency light. This display device includes a light source unit, a main body, and a display unit. It also discloses that an engagement claw of the light source unit engages with a main body-side light source unit engagement portion of the main body, and that an upper engagement portion of the light source unit engages with a main body-side light source unit movement suppression portion of the main body. It also discloses that an engagement protrusion of the light source unit engages with a display unit-side light source unit engagement portion of the display unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-107248 Summary of the Invention [Problem to be solved by the invention]

[0004] However, external forces may be applied to the light source section (light source unit) due to shaking such as an earthquake, and it may be desirable to more reliably prevent the light source unit from falling off the main body even if such external forces are applied.

[0005] The present disclosure has been made in view of the above-mentioned circumstances, and aims to provide a display device in which a light source unit is less likely to fall off from the main body. [Means for solving the problem]

[0006] A display device according to one aspect of the present disclosure includes a light source unit, a display block, and a main body. The light source unit has a light source and a housing that houses the light source. The display block includes a display panel that is illuminated by light emitted from the light source. The main body detachably holds the light source unit and the display block. The light source unit is held by the main body with the inner surface of the housing covering at least one side of the edge of the display block. The housing has a first portion on the inner surface. In the state, the display block has a second portion on the one side that can engage with the first portion. [Effects of the Invention]

[0007] According to the present disclosure, there is an advantage that the light source unit is less likely to fall off from the main body. [Brief explanation of the drawings]

[0008] [Figure 1] Fig. 1A is a perspective view of a display device according to one embodiment, Fig. 1B is a cross-sectional view of a main part in a region B shown in Fig. 1A, and Fig. 1C is a cross-sectional view of a main part in a region C shown in Fig. 1A. [Figure 2] FIG. 2 is an exploded perspective view of the display device. [Figure 3] FIG. 3 is an exploded perspective view of a display block in the display device. [Figure 4] FIG. 4 is a perspective view of the display block as viewed from behind. [Figure 5] FIG. 5 is an exploded perspective view illustrating an operation of attaching a display block to a main body in the display device of the above. [Figure 6] FIG. 6 is an exploded perspective view illustrating the operation of attaching the light source unit to the main body of the display device. [Figure 7] FIG. 7 is a perspective view of the light source unit as viewed from the rear. [Figure 8] FIG. 8 is an exploded perspective view of the light source unit as viewed from the rear. [Figure 9]9A and 9B are perspective views of a main part of a holder in the display block and a housing in the light source unit, respectively. [Figure 10] 10A and 10B are cross-sectional views of the main part of the display device. DETAILED DESCRIPTION OF THE INVENTION

[0009] Display devices according to embodiments of the present disclosure will be described in detail with reference to the drawings. However, the drawings described in the following embodiments are schematic diagrams, and the ratios of the sizes and thicknesses of the 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 are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0010] (1) Overview of the embodiment A display device B1 according to the embodiment (hereinafter simply referred to as display device B1) includes a light source unit A1, a display block 2, and a main body 1, as shown in FIGS. 1A and 2. FIG.

[0011] The light source unit A1 has a light source and a housing 4 (see FIGS. 2, 7, and 8) that houses the light source. In this embodiment, the light source is assumed to be, for example, an LED (Light Emitting Diode) 300 (see FIG. 8) as a solid-state light source.

[0012] The display block 2 includes a display panel 20 (see FIG. 3) that is illuminated by light emitted from a light source (LED 300).

[0013] 1A and 2, the main body 1 detachably holds the light source unit A1 and the display block 2. The light source unit A1 is held in the main body 1 in a state where the inner surface 400 (see FIGS. 1A and 1B) of the housing 4 covers at least one side surface H10 (see FIG. 9A) of the edge H1 (see FIG. 2) of the display block 2.

[0014] The housing 4 has a first portion S1 on the inner surface 400. As an example, it is assumed that the first portion S1 includes a groove 402 formed on the inner surface 400 as the recess J1. In this embodiment, the inner surface 400 includes a pair of opposing inner wall surfaces 401 on both side walls 42, 42 in the longitudinal direction (left-right direction) of the housing 4, which is formed in a long box shape, and the housing 4 has a recess J1 on each of the pair of inner wall surfaces 401 (see FIGS. 1B and 1C ).

[0015] In the above state, the display block 2 has a second portion S2 on one side surface H10 that can engage with the first portion S1. As an example, the second portion S2 is assumed to include a protrusion 224 protruding from the one side surface H10 as the protrusion J2. In this embodiment, the display block 2 has the second portion S2 on each of both side surfaces H10 of the edge portion H1 of the display block 2 in the longitudinal direction (left-right direction) (see FIGS. 1A, 1B, and 1C).

[0016] In short, the display device B1 not only holds the light source unit A1 in the main body 1, but also includes a portion where the light source unit A1 can engage with the display block 2 (held in the main body 1). In particular, in the display device B1, the housing 4 of the light source unit A1 has a first portion S1 on an inner surface 400, and the light source unit A1 is held in the main body 1 with the inner surface 400 covering at least one side surface H10 of the edge H1 of the display block 2. Therefore, when subjected to an external force due to shaking such as an earthquake, the light source unit A1 is less likely to fall off from the main body 1.

[0017] (2) Details of the embodiment (2-1) Configuration of the Display Device According to the Embodiment The display device B1 will be described with reference to the drawings. The display device B1 described below is an emergency exit light installed at an emergency exit or a passageway to an emergency exit in a facility (such as an office or store building). However, the display device according to the embodiment is not limited to emergency exit lights, and may be used, for example, to indicate a specific location (such as a restroom) within a facility. In the following description, unless otherwise specified, the up / down, front / back, and left / right directions indicated by arrows in FIG. 1A and other figures are defined as the up / down, front / back, and left / right directions of the display device B1.

[0018] The display device B1 includes a light source unit A1, a main body 1, a display block 2, etc. (See FIGS. 1A and 2.) The display device B1 also includes a connector .

[0019] (2-2) Main body configuration The main body 1 is made of synthetic resin and is formed in the shape of a rectangular box with an opening on the front (see FIG. 2). As shown in FIG. 2, the main body 1 has a pair of left and right side walls 101. Each side wall 101 is formed in the shape of a rectangular plate. Each of the pair of side walls 101 has a wall surface 102 (inner wall surface). The wall surfaces 102 of the pair of side walls 101 face each other. In other words, the pair of side walls 101 are arranged side by side with their thickness directions facing the left-right direction.

[0020] The main body 1 detachably holds the light source unit A1 and the display block 2. For example, after the light source unit A1 and the display block 2 are attached during the construction of the display device B1, when it is time to replace the light source (LED 300: see FIG. 8) or the battery (battery unit 13: see FIG. 2), the light source unit A1 or the display block 2 can be removed from the main body 1 and the replacement work can be performed. The holding structure of the main body 1 will be described below.

[0021] 2 and 5, the main body 1 has a pair of left and right holding portions 7A and a pair of left and right holding portions 7B as a holding structure for holding the display block 2. The pair of holding portions 7A are respectively disposed above the center of the main body 1 in the vertical direction and near the front edges of the wall surfaces 102 of the pair of side walls 101. The pair of holding portions 7B are respectively disposed below the center of the main body 1 in the vertical direction and near the front edges of the wall surfaces 102 of the pair of side walls 101.

[0022] The left-side holding portions 7A and 7B and the right-side holding portions 7A and 7B are configured to be plane-symmetrical in the left-right direction. The left-side holding portions 7A and 7B are formed integrally with the left side wall 101 so as to protrude rightward from the wall surface 102 of the left side wall 101 in a plate-like shape. The right-side holding portions 7A and 7B are formed integrally with the right side wall 101 so as to protrude leftward from the wall surface 102 of the right side wall 101 in a plate-like shape. The four holding portions (7A, 7B) are approximately L-shaped when viewed from the right, and are configured to slide and engage with four slide pieces (Y1, Y2) of the display block 2 (described later) in a one-to-one relationship. The pair of holding portions 7A and the pair of holding portions 7B configured in this manner hold the display block 2 in a manner that restricts movement of the display block 2 along the thickness direction and further downward movement by sliding the display block 2 downward along the wall surface 102.

[0023] Furthermore, as shown in FIG. 5, the main body 1 has a pair of claws 610 and a pair of recesses 611 as a suppression structure for suppressing movement of the display block 2 held by the above-mentioned four holding portions (7A, 7B).

[0024] The pair of claws 610 are provided above the pair of holding portions 7A and in positions near the front edges of the pair of wall surfaces 102 of the main body 1. The pair of recesses 611 are provided below the pair of holding portions 7B and in positions near the front edges of the pair of wall surfaces 102 of the main body 1. In other words, when viewing the main body 1 from the front, the pair of claws 610, the pair of holding portions 7A, the pair of holding portions 7B, and the pair of recesses 611 are arranged in this order from above. The pair of claws 610 and the pair of recesses 611 are formed integrally and continuously with the main body 1.

[0025] The pair of claws 610 are configured to be plane symmetrical in the left-right direction. Each claw 610 protrudes in a hook shape from the corresponding wall surface 102, with its tip pointing forward.

[0026] When the display block 2 is held by the main body 1, the pair of claws 610 fit into a pair of elongated slit-shaped grooves 620 (see FIG. 4) provided on the display block 2. As a result, movement (such as misalignment or twisting) of the display block 2 relative to the main body 1 is suppressed. For example, movement of the display block 2 in the left-right direction and movement of the display block 2 in the rotational direction around a virtual axis passing through the center of gravity of the display block 2 can be suppressed.

[0027] The pair of recesses 611 are configured to be plane symmetrical in the left-right direction. Each recess 611 is configured by a corresponding wall surface 102 and a hook-shaped protrusion formed integrally with the wall surface 102.

[0028] When the display block 2 is held by the main body 1, a pair of protrusions 621 (see FIG. 4) provided on the display block 2 fit into a pair of recesses 611, respectively. As a result, movement (such as misalignment or twisting) of the display block 2 relative to the main body 1 is suppressed. For example, movement of the display block 2 in the left-right direction and movement in the rotational direction around a virtual axis passing through the center of gravity of the display block 2 can be suppressed.

[0029] Furthermore, as shown in FIG. 6, the main body 1 has a pair of hook holes 103 and a pair of insertion portions 104 as a holding structure for holding the light source unit A1.

[0030] The pair of hook holes 103 are respectively arranged near both the left and right ends of the top surface of the main body 1. The pair of hook holes 103 are configured so that the tips of the pair of mounting pieces 46 (see FIG. 6) of the housing 4 of the light source unit A1 can be hooked from inside the main body 1.

[0031] The pair of insertion sections 104 are respectively arranged at the left and right corners of the upper part inside the main body 1. The pair of insertion sections 104 are spaces formed by ribs or the like protruding from the wall surfaces 102 of the pair of side walls 101 of the main body 1, and are configured so that a pair of support pieces 47 (see FIG. 6) of the housing 4 of the light source unit A1 can be inserted into the pair of insertion sections 104.

[0032] As shown in FIGS. 2 and 5, 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 connector 14, a mounting plate 10, and the like.

[0033] The connector 14 is Main unit 1 The light source (LED 300) is connected to a substrate 301 mounted thereon, and power for lighting the light source (LED 300) can be input thereto.

[0034] The power supply device 11 lights up the light source unit A1 with normal power supplied from a normal power source (for example, a commercial power system) and charges the battery unit 13. Furthermore, the power supply device 11 lights up the light source unit A1 with emergency power supplied from the battery unit 13 in the event of a power outage in the power system.

[0035] The mounting plate 10 is formed into a plate shape from a metal material (see Figures 2 and 5). 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.

[0036] (2-3) Display block configuration The display block 2 has a display panel 20, a light guide plate 21, and a holder 22 (see FIG. 3).

[0037] The display panel 20 is illuminated by light emitted from a light source (LED 300: see FIG. 8). The display panel 20 is formed in the shape of a rectangular flat plate from a light-transmitting synthetic resin material such as acrylic resin or polycarbonate resin. However, the display panel 20 may be formed from a light-transmitting 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. 1A).

[0038] The light guide plate 21 is formed in the shape of a rectangular flat plate 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. 3). 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. 2). The light incident on the incident surface 210 is guided inside the light guide plate 21 and emitted from the front surface (exit surface 211: see FIG. 3) of the light guide plate 21. The display panel 20 is illuminated by the light emitted from the exit surface 211 of the light guide plate 21.

[0039] The holder 22 is made of a non-transparent synthetic resin material and has 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 FIGS. 2 and 3).

[0040] 4, the holder 22 has four slide pieces (Y1, Y2) on its rear surface 220. Specifically, a pair of upper left and right slide pieces Y1 and a pair of lower left and right slide pieces Y2 are provided near both left and right edges of the rear surface 220 so as to correspond one-to-one to the pair of upper left and right holder parts 7A and the pair of lower left and right holder parts 7B of the main body 1, respectively.

[0041] The holder 22 in this embodiment employs a configuration in which the left-side slide pieces Y1, Y2 and the right-side slide pieces Y1, Y2 are plane-symmetrical in the left-right direction. The pair of upper slide pieces Y1 protrude rearward from the back surface 220 in a plate-like shape and are further formed to extend in a plate-like shape in a direction away from each other (outward). Similarly, the pair of lower slide pieces Y2 protrude rearward from the back surface 220 in a plate-like shape and are further formed to extend in a plate-like shape in a direction away from each other (outward). In other words, each slide piece (Y1, Y2) is shaped like a hook into which the corresponding holder (7A, 7B) can be slidably inserted from below into the inside thereof.

[0042] As shown in FIG. 4, the holder 22 has a pair of grooves 620 and a pair of protrusions 621 on the rear surface 220 thereof.

[0043] The pair of grooves 620 are configured to be plane-symmetrical in the left-right direction. The pair of grooves 620 are provided at positions corresponding to the pair of claws 610 on the main body 1 side of the display block 2. Specifically, as shown in FIG. 4, the holder 22 of the display block 2 has a thick frame 221 in which both left and right edges of the back surface 220 protrude further rearward than the center, and the pair of grooves 620 are respectively located near the upper edges of the back surfaces of the left and right frame portions 221. As shown in FIG. 4, each groove 620 is recessed forward like an elongated slit. When the holder 22 is viewed from above, each groove 620 extends to the upper surface of the corresponding frame portion 221 so as to be exposed from the upper surface.

[0044] The pair of protrusions 621 are configured to be plane-symmetrical in the left-right direction. The pair of protrusions 621 are provided at positions corresponding to the pair of recesses 611 on the main body 1 side of the display block 2. Specifically, as shown in FIG. 4, the pair of protrusions 621 are respectively arranged near the lower edges of the rear surfaces of the left and right frame portions 221 of the holder 22 of the display block 2. As shown in FIG. 4, each protrusion 621 protrudes from the bottom surface of a groove like an elongated slit formed on the rear surface of the frame portion 221. Each protrusion 621 is exposed rearward from the rear surface of the frame portion 221.

[0045] As shown in FIGS. 1B, 1C, 6, 10A, and 10B, the display block 2 of this embodiment includes a second portion S2 that can engage with the first portion S1 on the light source unit A1 side. The first portion S1 includes one of the protrusion J2 and the recess J1, and the second portion S2 includes the other of the protrusion J2 and the recess J1. As an example, it is assumed here that the first portion S1 includes the recess J1 and the second portion S2 includes the protrusion J2 (see FIGS. 1B, 1C, and 6). The second portion S2 (protrusion J2) included in the display block 2 will be described in detail below.

[0046] 10A is a cross-sectional view of the main part showing the state in which the first part S1 and the second part S2 on the left side fit together when the attachment of the light source unit A1 and the display block 2 to the main body 1 is complete (see FIG. 1A). FIG. 10A is a cross-sectional view of the main part including the first part S1 and the second part S2 on the left side as seen from the front. Like FIG. 1B, FIG. 10A is a cross-sectional view of the area B in FIG. 1A (the area indicated by the circular dashed line).

[0047] 10B is a cross-sectional view of the main part showing the state in which the first part S1 and the second part S2 on the right side fit together after the light source unit A1 and the display block 2 have been attached to the main body 1 (see FIG. 1A). FIG. 10B is a cross-sectional view of the main part including the first part S1 and the second part S2 on the right side as seen from the front. Like FIG. 1C, FIG. 10B is a cross-sectional view of the area C (the area enclosed by the circular dashed line) in FIG. 1A.

[0048] As shown in FIG. 6, the display block 2 has a pair of protrusions 224 arranged on both side surfaces (H10, H10) in the left-right direction of its edge H1 (upper edge). Each protrusion 224 corresponds to a convex portion J2 in the present disclosure. In other words, each protrusion 224 corresponds to a “second portion S2 that can engage with the first portion S1” in the present disclosure. In other words, the display block 2 has a second portion S2 on each side surface H10. The first portion S1 corresponds to each of a pair of grooves 402 (described later) provided on the inner surface 400 of the housing 4 of the light source unit A1 (see FIGS. 7 and 8). Each groove 402 corresponds to a recess J1 in the present disclosure. The first portion S1 and the second portion S2 can engage with each other by fitting the protrusion J2 into the recess J1. In other words, the display device B1 of this embodiment employs a structure in which the light source unit A1 is held relative to the display block 2 by engagement of the protrusions and recesses. In short, in this embodiment, the second portion S2 includes, as the convex portion J2, the protrusion 224 protruding from the one side surface H10.

[0049] Hereinafter, the side surface H10 on the right side of the edge H1 may be referred to as the first side surface H11, and the side surface H10 on the left side of the edge H1 may be referred to as the second side surface H12 (see FIG. 6). In short, the edge H1 has a first side surface H11 corresponding to one side surface H10, and a second side surface H12 opposite the first side surface H11 in the left-right direction (the longitudinal direction of the light source unit A1). The display block 2 has a second portion S2 (protrusion 224) on each of the first side surface H11 and the second side surface H12.

[0050] In this embodiment, the left and right side surfaces H10 correspond to the left and right side surfaces of the upper end of the holder 22. Specifically, as shown in FIG. 4, the pair of left and right frame portions 221 of the holder 22 have, at their upper ends, a pair of recesses 22A that are recessed in a direction that approaches each other in the left-right direction. The recesses 22A cause the side surfaces of the upper ends of each frame portion 221 to be recessed inward. On both inwardly recessed side surfaces of the pair of frame portions 221 (i.e., on both side surfaces H10 of the edge portion H1 of the display block 2), a pair of protrusions 224 protrude in a direction that moves away from each other in the left-right direction.

[0051] The pair of protrusions 224 are configured to be plane-symmetrical in the left-right direction. As shown in Figures 4, 6, 9A, 10A, and 10B, each protrusion 224 protrudes in a substantially hemispherical shape from the corresponding side surface H10. Each protrusion 224 is formed integrally and continuously with the corresponding frame portion 221 of the holder 22. Note that Figure 9A is a perspective view of the main part including the side surface at the upper end of the right frame portion 221 (i.e., the first side surface H11).

[0052] 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 except for the upper portion where the light source unit A1 is attached (see FIG. 1A). 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 (lower surface) of the light guide 5 of the light source unit A1 (see FIGS. 7 and 8) face each other in the vertical direction. Therefore, almost all of the light emitted from the exit 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 travels inside the light guide plate 21 and is totally reflected by the rear surface of the holder 22, and is emitted forward from the exit surface 211 of the light guide plate 21 to illuminate the display panel 20.

[0053] (2-4) Light source unit configuration The light source unit A1 has a light-emitting block 3, a light guide 5, and a housing 4 (see FIGS. 7 and 8).

[0054] The light emitting block 3 has a light emitting section 30, a heat dissipation member 31, a fixing member 32, and a heat conduction member 33 (see FIG. 8).

[0055] 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 FIG. 8). The LED 300 is mounted on the surface of a wide portion of the substrate 301. A pair of electrodes 302 is formed on the surface of a 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.

[0056] 8, the heat dissipation member 31 has a heat dissipation plate 310, a connecting portion 311 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. 8).

[0057] Each of the two protrusions 312 is formed integrally with the heat sink 310 by cutting and raising a portion of the heat sink 310. When viewed from the front-to-rear direction, each protrusion 312 is formed in a substantially trapezoidal shape. One end of each protrusion 312 (a 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.

[0058] Furthermore, one rectangular hole 313 is provided at the center of each of the short sides (vertical direction) and longitudinal directions (horizontal direction) of the heat sink 310 (see FIG. 8). These two holes 313 each penetrate the heat sink 310 in the thickness direction (front-rear direction).

[0059] The heat conducting member 33 is formed, for example, in a rectangular shape from a sheet of silicone resin (see FIG. 8). 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, heat generated in the LED 300 is conducted from the substrate 301 to the heat dissipation member 31 via the heat conducting member 33.

[0060] The fixture 32 has a main body 320, a first protruding piece 321, a second protruding piece 322, a pair of pressing portions 323, and a pair of claws 324 (see FIG. 8). The main body 320, the first protruding piece 321, the second protruding piece 322, the pressing portion 323, and the pair of claws 324 are formed continuously and integrally from a synthetic resin material.

[0061] The main body 320 is formed in a U-shape. Each of the pair of claws 324 is formed in a truncated pyramid shape. One pair of claws 324 is provided on the inner surface of each end of the main body 320.

[0062] The first protruding piece 321 is formed in a rectangular flat plate shape. The first protruding piece 321 faces the front end of the main body 320. The second protruding piece 322 is formed in a C-shape in a plan view. The second protruding piece 322 faces the rear end of the main body 320. The first protruding piece 321 and the second protruding piece 322 each protrude in the same direction (leftward) as both ends of the main body 320.

[0063] The pair of pressing portions 323 are each formed in a rectangular parallelepiped shape and protrude from the inner surface (left side surface) of the main body portion 320.

[0064] The fixture 32 positions 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, respectively, thereby fixing the light-emitting portion 30 to the heat dissipation member 31. 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 conduction member 33.

[0065] The light guide 5 is formed in a square prism shape from a light-transmitting synthetic resin material such as acrylic resin or polycarbonate resin (see FIG. 8). However, the shape of the light guide 5 is not limited to a square prism, and may be a square pyramid or a truncated pyramid.

[0066] Of the two bottom surfaces (left and right bottom surfaces) 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 (see FIGS. 8 and 10B). Furthermore, of the four side surfaces (front, rear, top, and 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 facing the exit surface has a large number of grooves formed therein.

[0067] As shown in Figure 8, of the four side surfaces of the light guide 5, two side surfaces 52 (front surface and rear surface) adjacent to the emission surface 51 are each provided with two protruding engaging portions 53 (in Figure 8, only the two engaging portions 53 on the rear surface are shown).

[0068] The housing 4 is formed into a long box shape as a whole, and is configured to house the light emitting block 3 including the light source (LED 300) and the light guide body 5.

[0069] Specifically, the housing 4 has a front wall 40, an upper wall 41, a pair of side walls 42, a storage portion 43, an attachment portion 44, a plurality of positioning portions 45, a pair of attachment pieces 46, and a pair of support pieces 47 (see FIG. 8 ). 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 open rear and bottom faces by the front wall 40, the upper wall 41, and the pair of side walls 42.

[0070] The housing 43 is formed in the shape of a long box with the front, bottom, and right side open (see FIG. 8). The housing 43 houses the light guide 5 such that the incident surface 50 of the light guide 5 is exposed from the right side and the exit surface 51 of the light guide 5 is exposed from the bottom.

[0071] As shown in FIG. 8, the housing 43 includes a rear plate 430, an upper plate 431 (see FIGS. 10A and 10B), a front plate 432, and a side plate 433. The rear plate 430 is formed in an elongated rectangular shape that is slightly shorter than the front wall 40 of the housing 4 and faces the front wall 40 in the front-rear direction (see FIG. 8). The upper plate 431 is formed in an elongated rectangular shape whose longitudinal length is approximately equal to that of the rear plate 430 and protrudes forward from the upper end of the rear plate 430. 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. A rib 4330 (see FIG. 8) protrudes rightward 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 greater than the thickness of the light guide 5 in the front-rear direction.

[0072] Here, two mating portions 4300 are provided on the rear plate 430 (see FIG. 8). Each of the two mating portions 4300 is formed as a rectangular hole. Two mating portions 53 provided on the rear side surface 52 of the light guide 5 are fitted into each of the two mating portions 4300, one each.

[0073] The front plate 432 is formed in the shape of a rectangular flat plate. The front plate 432 protrudes downward from the right end of the upper plate 431 so as to face the rear plate 430. The length of the front plate 432 in the longitudinal direction (left-right direction) is shorter than the length of the heat dissipation plate 310 in the longitudinal direction. The distance between the rear plate 430 and the front plate 432 in the front-rear direction is equal to the distance between the rear plate 430 and the rib 4330 in the front-rear direction.

[0074] As shown in FIG. 8, the attachment portion 44 has a pair of protrusions 440, a pressing piece 441, and an abutting piece 442, and is configured to attach the light emitting block 3 to the housing 4.

[0075] The pair of protrusions 440 are provided on the inner wall surface 401 (inner surface 400) of the right side wall 42 of the pair of side walls 42 (see FIG. 8). 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 wall surface 401 of the side wall 42 so as to be aligned parallel to each other with a fixed distance between them in the front-to-rear direction. The distance between the pair of protrusions 440 in the front-to-rear direction is slightly larger than the width dimension of the main body 320 of the fixing device 32.

[0076] 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 wall surface 401 of the right side wall 42 (see FIG. 8).

[0077] The abutment piece 442 is provided at the right end of the rear plate 430 (see FIG. 8). The abutment piece 442 is formed in an L shape 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.

[0078] Two positioning portions 45 are provided on the left and right sides of the rear surface of the front wall 40 (see FIG. 8). Each positioning portion 45 has a pair of rectangular parallelepipeds. The pair of rectangular parallelepipeds protrude rearward from the rear surface of the front wall 40 so that their axial directions coincide with the vertical direction and they are aligned parallel to each other with a gap of a certain width between them. The width of the gap between the positioning portions 45 is slightly larger than the width of the fitting portion 53 of the light guide 5 in the left-right direction.

[0079] The right fitting portion 53 (not shown in FIG. 8) on the front side surface 52 of the light guide 5 fits into the gap of the right positioning portion 45. Also, the left fitting portion 53 (not shown in FIG. 8) on the front side surface 52 of the light guide 5 fits into the gap of the left positioning portion 45. 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.

[0080] The pair of support pieces 47 protrude rearward, one from each of the left and right ends of the upper wall 41. The pair of mounting pieces 46 protrude rearward, one from each of the left and right ends of the upper wall 41. However, each mounting piece 46 is located more inward than each of the support pieces 47 (see FIG. 8).

[0081] In other words, the housing 4 houses the light emitting unit 30 at the right end thereof, and the light guide 5 on the left of the light emitting unit 30. The housing 4 houses the light guide 5 such that the incident surface 50 of the light guide 5 faces the LED 300 of the light emitting unit 30, and the exit surface 51 of the light guide 5 is exposed from the bottom surface.

[0082] 1B, 1C, 6, 10A, and 10B, the light source unit A1 of this embodiment has a first portion S1 that can engage with a second portion S2 (protrusion J2) on the display block 2. As described above, the housing 4 has the first portion S1 on the inner surface 400, and the first portion S1 includes a recess J1 (see FIGS. 1B, 1C, 6, 7, and 9B). The first portion S1 (recess J1) of the light source unit A1 will be described in detail below.

[0083] In this embodiment, the first portion S1 includes a groove 402 formed on the inner surface 400 of the housing 4 as the recess J1. The inner surface 400 of the housing 4 includes a pair of opposing inner wall surfaces 401 on both side walls 42, 42 in the longitudinal direction (left-right direction) of the housing 4. The inner surface 400 also includes the rear surface of the front wall 40 and the lower surface of the top wall 41. The housing 4 has the first portion S1 (groove 402) on each of the pair of inner wall surfaces 401 of the inner surface 400.

[0084] Each groove 402 is recessed as a whole into the shape of a half cylinder whose axial direction is aligned in the up-down direction. A pair of grooves 402 is configured to be plane-symmetrical in the left-right direction. As shown in FIGS. 7, 8, 9B, 10A, and 10B, each groove 402 is recessed outward at the lower edge of the corresponding inner wall surface 401. Specifically, for example, the right groove 402 of the pair of grooves 402 is recessed rightward at the lower edge of the inner wall surface 401 of the right side wall 42 (see FIG. 9B). Note that FIG. 9B is a perspective view of a main part of the inner wall surface 401 of the right side wall 42 as viewed from below. When viewed in the left-right direction, each groove 402 has an arc-shaped upper edge, and the entire periphery is in an inverted U shape (see FIGS. 7 and 8).

[0085] Each groove 402 extends to the lower surface 420 of the corresponding side wall 42 so as to be exposed from the lower surface 420 when the side wall 42 is viewed from below (see FIG. 9B).

[0086] Each groove 402 (recess J1) is a groove having a dimension such that at least a portion, including the top, of the corresponding protrusion 224 (protrusion J2) on the display block 2 can be inserted therein (see FIGS. 10A and 10B). Each groove 402 is long in the vertical direction. As shown in FIGS. 10A and 10B, the length of each groove 402 in the vertical direction is slightly longer than the diameter of the protrusion 224. The width of each groove 402 in the front-to-rear direction is slightly smaller than the diameter of the protrusion 224. When the hemispherical protrusion 224 is inserted into the groove 402, the top of the protrusion 224 does not come into contact with the bottom of the groove 402, leaving a slight gap therebetween (see FIGS. 10A and 10B), but they may also come into contact.

[0087] In this embodiment, the inner peripheral surface of each groove 402 is recessed in a curved shape so as to guide the corresponding protrusion 224 (protrusion J2) when the light source unit A1 is attached.

[0088] On the other hand, in this embodiment, as shown in FIG. 9A, the protrusion J2 also has guide surfaces (G1, G2) that guide the light source unit A1 so that it can be easily displaced when the light source unit A1 is attached and removed.

[0089] Specifically, the convex portion J2 (protrusion 224) enters the concave portion J1 (groove 402) by pushing the light source unit A1 in the direction (rearward) approaching the main body 1 along the thickness direction (front-rear direction) of the display panel 20. Then, the inner surface 400 covers both side surfaces H10, H10 of the display block 2. The convex portion J2 has a push guide surface G1 (see FIG. 9A) that guides the displacement of the light source unit A1 on the surface (front outer peripheral surface) facing the direction (rearward) in which the light source unit A1 approaches the main body 1. The push guide surface G1 is curved. Here, as an example, the push guide surface G1 is curved and bulges outward.

[0090] In addition, in the above state, the convex portion J2 is removed from the concave portion J1 by pulling the light source unit A1 in a direction (forward) away from the main body 1 along the thickness direction of the display panel 20. The convex portion J2 has a pull guide surface G2 (see FIG. 9A) that guides the displacement of the light source unit A1 on the surface (outer peripheral surface on the rear side) that faces the direction (forward) in which the light source unit A1 moves away from the main body 1. The pull guide surface G2 is curved. Here, as an example, the pull guide surface G2 is curved and bulges outward.

[0091] In short, the outer peripheral surface of each protrusion 224 has a curved shape that bulges out in a substantially hemispherical shape as a whole due to a continuous surface made up of the pushing guide surface G1 and the pulling guide surface G2 that bulge out in a curved shape.

[0092] The radius of curvature of the circumferential surface of each groove 402 that is recessed in an arc shape is approximately equal to the radius of curvature of the circumferential surface of the hemispherical protrusion 224 .

[0093] Each protrusion 224 (protrusion J2) has a push guide surface G1 and a pull guide surface G2, which makes it easy to insert the protrusion 224 (protrusion J2) into the groove 402 (recess J1) and remove it from the groove 402 (recess J1) without requiring excessive force. As a result, the light source unit A1 can be easily attached to and removed from the main body 1 and the display block 2. Furthermore, because the push guide surface G1 and the pull guide surface G2 are each curved, a guide function can be provided for each protrusion 224 (protrusion J2) with a simple configuration.

[0094] The distance between the pair of inner wall surfaces 401 in the left-right direction is slightly smaller than the distance between the tops of the pair of protrusions 224 on the display block 2. The distance between the bottoms of the pair of grooves 402 in the left-right direction is approximately equal to the distance between the tops of the pair of protrusions 224 on the display block 2.

[0095] (2-5) Construction procedure The installation procedure for the display device B1 will be briefly described below with reference to FIGS.

[0096] First, the worker performing the installation work pulls in the power line from the power supply hole 15 (see FIG. 5) provided on the bottom surface of the main body 1, and then attaches the main body 1 to a structure in the facility (here, the wall W1 of the building as shown in FIG. 5) with wood screws or nails. Next, the worker electrically connects the power line pulled in from the power supply hole 15 to the terminal block 12.

[0097] 5, the worker attaches the display block 2 to the main body 1. Specifically, the worker brings the back surface of the display block 2 into contact with the front surface of the main body 1, with the main body 1 attached to the facility structure (wall W1), so that the top end of the display block 2 is at the same position as (or slightly below) the top end of the main body 1. As a result, the tips of the pair of claws 610 on the main body 1 are inserted into the pair of grooves 620 on the display block 2, respectively.

[0098] Then, the worker slides the display block 2 downward along the pair of wall surfaces 102, causing the tips of the pair of claws 610 to slide within the pair of grooves 620 while fitting into the pair of grooves 620. The four plate-shaped retaining portions (7A, 7B) also slide into the insides of the four hook-shaped slide pieces (Y1, Y2) on the display block 2. That is, the four slide pieces (Y1, Y2) slide and engage with the four retaining portions (7A, 7B), achieving the retention of the display block 2 by the retaining portions (7A, 7B), and completing the installation of the display block 2 on the main body 1. At this time, the pair of protrusions 621 fit into the pair of recesses 611 from above.

[0099] In this way, the four slide pieces (Y1, Y2) of the display block 2 slide and engage with the four holding portions (7A, 7B), so that the display block 2 is held in the main body 1 in a position where its lower surface is approximately flush with the lower surface of the main body 1. When the display block 2 is held, the tips of the pair of claws 610 remain inserted into the pair of grooves 620, respectively, and the pair of protrusions 621 remain inserted into the pair of recesses 611, respectively.

[0100] As a result, movement of the display block 2 in the thickness direction (front-rear direction) and further movement downward are restricted. Furthermore, when an external force is applied due to shaking such as an earthquake, the tip of the claw portion 610 abuts (i.e., engages with) the inner surface of the groove portion 620, and the protrusion portion 621 abuts (i.e., engages with) the inner surface of the recess portion 611. Therefore, movement of the display block 2 in the left-right direction and in the rotational direction is restricted.

[0101] Finally, the worker attaches the light source unit A1 to the main body 1 as shown in Fig. 6. In Fig. 6, the wall W1 of the building is not shown.

[0102] Specifically, the worker inserts the narrow portion of the substrate 301 on which the LED 300 is mounted into the connector 14 of the main body 1, and pushes the light source unit A1 toward the main body 1 so that the pair of support pieces 47 are inserted into the pair of insertion portions 104 inside the main body 1, respectively.

[0103] At this time, the worker receives stress from the light source unit A1 as the rear edges of the pair of left and right side walls 42 of the housing 4 of the light source unit A1 hit the pair of protrusions 224 (protrusions J2) on the display block 2 side. When the worker pushes the light source unit A1 further backward against this stress, the pair of left and right side walls 42 are pushed by the pair of hemispherical protrusions 224 and elastically deform in directions away from each other (outward). As a result, the tops of the pair of protrusions 224 ride up onto the pair of inner wall surfaces 401, respectively. At this time, as described above, each protrusion 224 (protrusion J2) has a push guide surface G1 (see FIG. 9A). Therefore, the tops of the protrusions 224 can easily ride up onto the pair of inner wall surfaces 401 without applying excessive force.

[0104] When the worker pushes the light source unit A1 rearward, the tops of the pair of protrusions 224 slide along the pair of inner wall surfaces 401 while bending the pair of side walls 42 outward. When the tops of the pair of protrusions 224 reach and fit into the pair of grooves 402, the pair of left and right side walls 42 elastically return to their original position in a direction approaching each other (inward). Almost simultaneously, the claws provided at the tips of the pair of mounting pieces 46 hook onto the edges of the pair of hook holes 103 provided on the top surface of the main body 1.

[0105] As a result, the light source unit A1 is attached to the main body 1 in a manner such that it is disposed above the display block 2. The light source unit A1 is held in the main body 1 with the inner surface 400 of the housing 4 covering the edge H1 (upper edge) of the display block 2, including both side surfaces H10, H10. That is, in the above state, the pair of inner wall surfaces 401 cover the first side surface H11 and the second side surface H12, respectively. In the above state, the light source unit A1 is not only held directly by the main body 1, but also more stably held by the display block 2 and the main body 1 due to the engagement between the recessed portion J1 and the protruding portion J2.

[0106] In this manner, the installation of the display device B1 is completed.

[0107] If it is necessary to replace the LED 300 or the battery unit 13, the worker pulls the housing 4 in a direction away from the main body 1 (forward) with a force greater than or equal to a certain magnitude so as to rotate the housing 4 around the fulcrum where the claws of the pair of mounting pieces 46 are hooked into the pair of hooking holes 103. As a result, the pair of protrusions 224 are released from the pair of grooves 402, respectively, and the claws of the pair of mounting pieces 46 are released from the pair of hooking holes 103, respectively, and the light source unit A1 can be removed from the main body 1 and the display block 2.

[0108] That is, in this embodiment, the engagement between the first portion S1 and the second portion S2 is released when a force of a certain magnitude or more is applied to the housing 4 in a direction (forward) away from the main body 1 in the above-mentioned state (here, a state in which the inner surface 400 covers the edge H1 of the display block 2). At this time, as described above, since each protrusion 224 (protrusion J2) has the pull guide surface G2 (see FIG. 9A), the protrusion 224 (protrusion J2) can easily come out of the groove 402 (recess J1) without applying excessive force, facilitating the operation of removing the light source unit A1 from the display block 2.

[0109] Next, the display block 2 can be removed from the main body 1 by sliding the display block 2 upward and then moving it forward.

[0110] (3) Advantages of the display device according to the embodiment As described above, the display device B1 not only holds the light source unit A1 in the main body 1, but also has portions (first portion S1 and second portion S2) where the light source unit A1 can engage with the display block 2 (held in the main body 1). Furthermore, in the display device B1, the housing 4 of the light source unit A1 has the first portion S1 on its inner surface 400, and the light source unit A1 is held in the main body 1 in a state where the inner surface 400 covers at least one side surface H10 of the edge portion H1 of the display block 2. Therefore, for example, when subjected to an external force due to shaking such as an earthquake, the light source unit A1 is less likely to fall off from the main body 1.

[0111] Furthermore, as described above, the housing 4 has a first portion S1 on each of the pair of inner wall surfaces 401, and the display block 2 has a second portion S2 on each of the first side surface H11 and the second side surface H12, which makes it more likely that the light source unit A1 will fall off from the main body 1.

[0112] In particular, the display block 2 is restricted from moving in the thickness direction (front-back direction) and further downward relative to the main body 1, and is also restricted from moving in the left-right direction and in the rotational direction. When the light source unit A1 is held in the main body 1, the first portion S1 can be engaged with the second portion S2 of the display block 2, which further prevents the light source unit A1 from falling off the main body 1.

[0113] Furthermore, the engagement between the first part S1 and the second part S2 is released when a force of a certain magnitude or greater is applied to the housing 4 in a direction (forward) away from the main body 1. Therefore, for example, when replacing the LED 300 or the like, the light source unit A1 can be easily removed from the main body 1 and the display block 2.

[0114] The first portion S1 includes a groove 402 formed on the inner surface 400 as the recess J1, and the second portion S2 includes a protrusion 224 protruding from one side surface H10 as the protrusion J2. Therefore, despite the simple configuration, the light source unit A1 is less likely to fall off from the main body 1.

[0115] The light source (LED 300) is disposed adjacent to the inner wall surface 401 (where the first portion S1 is provided) in the longitudinal direction (left-right direction). Specifically, when the light source unit A1 is held in the main body 1, the light-emitting section 30 including the LED 300 is disposed adjacent to the inner wall surface 401 of the right side wall 42 where the first portion S1 is provided, as shown in FIG. 10B. Therefore, when the display device B1 is subjected to an external force due to shaking such as an earthquake, or when the display device B1 is subjected to an external force from a worker during installation or replacement work, it is possible to reduce stress acting on the light source (LED 300).

[0116] Furthermore, the connector 14 is disposed adjacent to the inner wall surface 401 (on which the first portion S1 is provided) in the longitudinal direction (left-right direction). Specifically, when the light source unit A1 is held in the main body 1, the connector 14 into which the board 301 of the light-emitting unit 30 is inserted is disposed behind the light-emitting unit 30. That is, the connector 14 is disposed adjacent to the inner wall surface 401 of the right side wall 42 on which the first portion S1 is provided. Therefore, when the display device B1 is subjected to an external force due to shaking such as an earthquake, or when the display device B1 is subjected to an external force from a worker during installation or replacement work, it is possible to reduce stress acting on the connector 14 or the board 301 connected to the connector 14.

[0117] (4) Variations Below, modifications of the display device B1 according to the above-described embodiment will be listed.

[0118] In the above-described embodiment, the recessed portion J1 as the first portion S1 is provided on the inner surface 400 of the housing 4 of the light source unit A1, and the protruding portion J2 as the second portion S2 is provided on the side surface H10 of the display block 2, but the uneven structure may be arranged in reverse. That is, the protruding portion J2 as the first portion S1 may be provided on the inner surface 400 of the housing 4 of the light source unit A1, and the recessed portion J1 as the second portion S2 may be provided on the side surface H10 of the display block 2.

[0119] In the above-described embodiment, a pair of recesses J1 are provided as the first portion S1, but the number of recesses J1 is not particularly limited and may be one, three, or more. Also, a pair of protrusions J2 are provided as the second portion S2, but the number of protrusions J2 is not particularly limited and may be one, three, or more.

[0120] In the above-described embodiment, the first portion S1 includes the groove 402 that is long in one direction (vertical direction) as the recess J1, but the first portion S1 may include a depression that is recessed in approximately the same shape (hemispherical) as the protrusion J2 instead of the groove 402. In other words, the recess J1 is not limited to being groove-shaped.

[0121] In the above-described embodiment, when the light source unit A1 is held by the main body 1 and the display block 2, the protrusion J2 fits into the recess J1 without any gap in the front-to-rear direction, and the engagement is achieved even when no external force is applied. However, the protrusion J2 may be accommodated in the recess J1 with a gap in the front-to-rear direction, and the engagement may be achieved when an external force is applied.

[0122] In the above-described embodiment, the light source unit A1 includes one light-emitting section 30. However, for example, the light source unit A1 may include two light-emitting sections 30. The two light-emitting sections 30 may be arranged one on each end of the light guide 5 in the longitudinal direction.

[0123] In the above-described embodiment, the display device B1 is a so-called single-sided display device in which the display block 2 is attached only to the front surface of the main body 1 and the rear surface of the main body 1 faces the wall surface W1 of the structure. However, for example, the display device B1 may be a so-called double-sided display device in which the light source unit A1 and the display block 2 are attached to both the front and rear surfaces of the main body 1. In this case, each light source unit A1 has a first portion S1, and each display block 2 has a second portion.

[0124] (summary) The above-described embodiments and the like disclose the following aspects.

[0125] A display device (B1) according to a first aspect includes a light source unit (A1), a display block (2), and a main body (1). The light source unit (A1) has a light source (LED300) and a housing (4) that houses the light source (LED300). The display block (2) includes a display panel (20) that is illuminated by light emitted from the light source (LED300). The main body (1) detachably holds the light source unit (A1) and the display block (2). The light source unit (A1) is held in the main body (1) with an inner surface (400) of the housing (4) covering at least one side surface (H10) of an edge portion (H1) of the display block (2). The housing (4) has a first portion (S1) on the inner surface (400). In the above state, the display block (2) has a second portion (S2) on one side surface (H10) that can be engaged with the first portion (S1).

[0126] According to the above aspect, the housing (4) of the light source unit (A1) has the first portion (S1) on the inner surface (400), and the light source unit (A1) is held in the main body (1) in a state where the inner surface (400) covers at least one side surface (H10) of the edge portion (H1) of the display block (2). This has the advantage that the light source unit (A1) is less likely to fall off from the main body (1) when subjected to an external force, for example, due to shaking caused by an earthquake.

[0127] Regarding the display device (B1) of the second aspect, in the first aspect, the engagement between the first part (S1) and the second part (S2) is released when a force of a certain magnitude or greater acts on the housing (4) in a direction (forward) away from the main body (1) in the above state.

[0128] According to the above aspect, for example, when replacing the light source (LED 300) or the like, the light source unit (A1) can be easily removed from the main body (1) and the display block (2).

[0129] Regarding the display device (B1) according to the third aspect, in the first or second aspect, the first portion (S1) includes one of the convex portion (J2) and the concave portion (J1). The second portion (S2) includes the other of the convex portion (J2) and the concave portion (J1). The first portion (S1) and the second portion (S2) can be engaged with each other by the convex portion (J2) entering the concave portion (J1).

[0130] According to the above aspect, the light source unit (A1) is less likely to fall off from the main body (1) despite the simple configuration.

[0131] In the display device (B1) according to the fourth aspect, in the third aspect, the first portion (S1) includes a groove (402) formed on the inner surface (400) as the recess (J1). The second portion (S2) includes a protrusion (224) protruding from one side surface (H10) as the protrusion (J2).

[0132] According to the above aspect, the light source unit (A1) is less likely to fall off from the main body (1) despite the simple configuration.

[0133] In the display device (B1) according to the fifth aspect, in the third or fourth aspect, the convex portion (J2) enters the concave portion (J1) and assumes the above-mentioned state by pushing the light source unit (A1) in a direction (rearward) approaching the main body (1) along the thickness direction of the display panel (20). The convex portion (J2) has a push guide surface (G1) that guides the displacement of the light source unit (A1) on a surface (front outer peripheral surface) facing the direction (rearward) in which the light source unit (A1) approaches the main body (1).

[0134] According to the above aspect, the work of attaching the light source unit (A1) to the display block (2) becomes easy.

[0135] Regarding the display device (B1) according to the sixth aspect, in the fifth aspect, the pushing guide surface (G1) is curved.

[0136] According to the above aspect, a guide function can be provided with a simple configuration.

[0137] With respect to the display device (B1) according to the seventh aspect, in any one of the third to sixth aspects, the convex portion (J2) is removed from the concave portion (J1) in the above state by pulling the light source unit (A1) in a direction (forward) away from the main body (1) along the thickness direction of the display panel (20). The convex portion (J2) has a pull guide surface (G2) that guides displacement of the light source unit (A1) on a surface (rear outer peripheral surface) facing the direction (forward) away from the main body (1).

[0138] According to the above embodiment, the light source unit (A1) can be easily removed from the display block (2).

[0139] With respect to the display device (B1) according to the eighth aspect, in the seventh aspect, the pull guide surface (G2) is curved.

[0140] According to the above aspect, a guide function can be provided with a simple configuration.

[0141] Regarding the display device (B1) according to the ninth aspect, in any one of the first to eighth aspects, the housing (4) is formed in a long box shape. The inner surface (400) includes a pair of opposing inner wall surfaces (401) on both side walls (42, 42) in the longitudinal direction (left-right direction) of the housing (4). The housing (4) has a first portion (S1) on each of the pair of inner wall surfaces (401). The edge portion (H1) has a first side surface (H11) corresponding to the one side surface (H10) and a second side surface (H12) opposite the first side surface (H11) in the longitudinal direction (left-right direction). In the above state, the pair of inner wall surfaces (401) respectively cover the first side surface (H11) and the second side surface (H12). The display block (2) has a second portion (S2) on each of the first side surface (H11) and the second side surface (H12).

[0142] According to the above aspect, it becomes more reliably possible to prevent the light source unit (A1) from falling off from the main body (1).

[0143] Regarding the display device (B1) according to the tenth aspect, in any one of the first to ninth aspects, the housing (4) is formed in a long box shape. The inner surface (400) includes a pair of opposing inner wall surfaces (401) on both side walls (42, 42) in the longitudinal direction (left-right direction) of the housing (4). The first portion (S1) is provided on one of the pair of inner wall surfaces (401). The light source (LED 300) is arranged adjacent to the inner wall surface (401) in the longitudinal direction (left-right direction).

[0144] According to the above aspect, the light source (LED300) is arranged adjacent to the inner wall surface (401) on which the first portion (S1) is provided, thereby reducing the stress acting on the light source (LED300) when subjected to an external force.

[0145] The display device (B1) according to an eleventh aspect is any one of the first to tenth aspects, further comprising a connector (14). The connector (14) comprises: Main unit (1) The housing (4) is disposed within the housing (4), and a board (301) on which a light source (LED 300) is mounted is connected to input power for lighting the light source (LED 300). The housing (4) is formed in a long, box-like shape. The inner surface (400) includes a pair of opposing inner wall surfaces (401) on both side walls (42, 42) in the longitudinal direction (left-right direction) of the housing (4). The first portion (S1) is provided on one of the pair of inner wall surfaces (401). The connector (14) is disposed adjacent to the inner wall surface (401) in the longitudinal direction (left-right direction).

[0146] According to the above aspect, the connector (14) is arranged adjacent to the inner wall surface (401) on which the first portion (S1) is provided, thereby reducing the stress acting on the connector (14) or the substrate (301) when subjected to an external force.

[0147] The configurations according to the second to eleventh aspects are not essential for the display device (B1) and can be omitted as appropriate. [Explanation of symbols]

[0148] A1 Light Source Unit B1 Display device 1 Main unit 14 Connectors 2 Display Block 20 Display panel 224 Protrusion 300 LEDs (light source) 301 Substrate 4. Cabinet 42 Side wall 400 Inner 401 Inner wall 402 Groove G1 Push guide surface G2 Pull guide surface H1 edge H10 one side H11 1st aspect H12 2nd side J1 recess J2 convex part S1 1st part S2 2nd part

Claims

1. a light source unit having a light source and a housing that houses the light source; a display block including a display panel illuminated by light emitted from the light source; a main body that detachably holds the light source unit and the display block; Equipped with the light source unit is held by the main body in a state where an inner surface of the housing covers at least one side surface of an edge portion of the display block; the housing has a first portion on the inner surface; the display block has a second portion on the one side surface that can be engaged with the first portion in the state; Display device.

2. The engagement between the first portion and the second portion is released when a force of a certain magnitude or greater acts on the housing in a direction away from the main body in the state. The display device according to claim 1 .

3. the first portion includes one of a convex portion and a concave portion, and the second portion includes the other of the convex portion and the concave portion, When the protrusion enters the recess, the first portion and the second portion can be engaged with each other. The display device according to claim 1 or 2.

4. the first portion includes a groove formed on the inner surface as the recess, The second portion includes, as the convex portion, a protrusion protruding from the one side surface. The display device according to claim 3 .

5. When the light source unit is pushed in a direction approaching the main body along a thickness direction of the display panel, the convex portion enters the concave portion and assumes the above-described state. the protrusion has a push guide surface that guides displacement of the light source unit on a surface that faces a direction in which the light source unit approaches the main body; The display device according to claim 3 or 4.

6. The pushing guide surface is curved. The display device according to claim 5 .

7. In the above state, the convex portion is detached from the concave portion by pulling the light source unit in a direction away from the main body along a thickness direction of the display panel, The protrusion has a pull guide surface that guides the displacement of the light source unit on a surface that faces a direction in which the light source unit moves away from the main body. The display device according to any one of claims 3 to 6.

8. The pull guide surface is curved. The display device according to claim 7 .

9. The housing is formed in a long box shape, the inner surface includes a pair of inner wall surfaces facing each other on both side walls in the longitudinal direction of the housing, the housing has the first portion on each of the pair of inner wall surfaces, The edge portion has a first side surface corresponding to the one side surface and a second side surface opposite to the first side surface in the longitudinal direction, In the state, the pair of inner wall surfaces cover the first side surface and the second side surface, respectively; the display block has the second portion on each of the first side surface and the second side surface; The display device according to any one of claims 1 to 8.

10. The housing is formed in a long box shape, the inner surface includes a pair of inner wall surfaces facing each other on both side walls in the longitudinal direction of the housing, the first portion is provided on one of the pair of inner wall surfaces, The light source is disposed adjacent to the inner wall surface in the longitudinal direction. The display device according to any one of claims 1 to 8.

11. a connector disposed within the main body to which a board on which the light source is mounted is connected to input power for lighting the light source; The housing is formed in a long box shape, the inner surface includes a pair of inner wall surfaces facing each other on both side walls in the longitudinal direction of the housing, the first portion is provided on one of the pair of inner wall surfaces, The connector is disposed adjacent to the inner wall surface in the longitudinal direction. The display device according to any one of claims 1 to 8 and 10.

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