JP2011118041A - Surface emitting display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface emitting display device in which heat from a light emitting diode can be sufficiently radiated, also a light emitting diode which is broken or comes to the end of its life can be easily replaced. <P>SOLUTION: The surface emitting device includes: light guide plate units 13, 15 composed of light guide plates 17, 19 and heat sinks 21, 23 of which the frontal surfaces are contacted with the backside of the light guide plates; a plurality of circuit board units 25, 27 which are arranged along one side of the light guide plate unit and which have a plurality of light emitting diodes radiating light into the light guide plates; indication plates 9, 11 which are arranged at frontal surface sides of the light guide plates and which are lighted by light from the light guide plates; and a structure 7 for holding which holds the light guide plate units 13, 15 and the indication plates 9, 11 in such a way that a most part of the frontal surfaces of the indication plates is exposed. Board unit attachment implements 29, 31 to which the circuit board units 25, 27 are attached and which have thermal conductivity are attached in a replaceable manner to the structure 7 for holding having thermal conductivity. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an edge light type surface emitting display device that guides light from a plurality of light emitting diodes (hereinafter referred to as “LEDs”) to the front surface of a light guide plate through the light guide plate.

  Japanese Patent Application Laid-Open No. 2006-11101 [Patent Document 1] discloses a plurality of LEDs used as light sources arranged along a side surface of one side of a light guide plate, and translucency arranged on the front and back sides of the light guide plate. A surface light emitting display plate composed of a front plate and a back plate having a water stop material (sealing material) provided over the entire circumference between the front plate and the back plate is held by a metal frame. A surface-emitting display device is disclosed. In this apparatus, heat generated from a light source is radiated from a frame made of a metal angle member having high thermal conductivity.

  Japanese Patent Application Laid-Open No. 2004-271734 [Patent Document 2] holds a side of a translucent panel with a light emitter mounting member made of an extruded product of an aluminum alloy that holds a light source composed of a plurality of LEDs. A surface-emitting display device is disclosed. This publication discloses that it is effective to use a light emitter mounting member that can promote the heat dissipation of the LED because the lifetime of the LED is shortened when the temperature of the LED rises.

  Furthermore, Japanese Patent Application Laid-Open No. 2005-38771 [Patent Document 3], Japanese Patent Application Laid-Open No. 2006-269140 [Patent Document 4] and Japanese Patent Application Laid-Open No. 2008-275920 [Patent Document 5] are used as light sources for surface-emitting display devices. A technique for dissipating heat generated from an LED using a heat transfer member is disclosed.

  Further, Japanese Patent Application Laid-Open No. 2004-325604 [Patent Document 6] discloses a circuit including a power source, an emergency power source, a display unit holder for locking a display unit, and a plurality of LEDs in a single-sided light emitting display device. A structure is disclosed in which a substrate is housed, a heat radiating plate is connected to the display unit holder and the circuit board, and heat from the power source and the LED is radiated to the outside of the display body.

  Further, in FIG. 3 of Japanese Patent No. 3812673 [Patent Document 7], a plurality of H-shaped sockets are each mounted with a circuit board on which LEDs are mounted, and the plurality of H-shaped sockets can be removed on one side of a large light guide plate. A surface light source device mounted side by side is disclosed. In this apparatus, it is disclosed that, when an LED mounted on a circuit board is partially broken, an H-shaped socket on which the board on which the broken LED is mounted is replaced with a new one.

  Further, Japanese Patent Application Laid-Open No. 2007-22079 [Patent Document 8] discloses a technique in which a plurality of units mounted with a light source such as an LED are arranged and only a unit mounted with a broken LED is replaced.

JP 2006-11101 A JP 2004-271734 A JP 2005-38771 A JP 2006-269140 A JP 2008-275920 A JP 2004-325604 A Japanese Patent No. 3812673 JP 2007-22079 A

  Edge light type surface emitting display devices (hereinafter referred to as “surface emitting display devices”) have been developed and used as screens for personal computers, televisions, mobile phones, etc. There was no need to guarantee for a long time, and even when the LED was used as a light emitter, it was not replaced.

  On the other hand, guide signs and advertisement signs have conventionally been internally lit using fluorescent lamps or cold cathode fluorescent lamps, but recently, LED signs have been developed for energy saving. Since signboards and advertising billboards will continue to be used for about 10 years, in order to extend the life of LEDs, we will actively dissipate the generated heat and allow replacement of broken or long-lived LEDs. There is a need.

  In addition, the specifications of the guide signboard and the advertisement signboard are often limited depending on the installation location, and the power supply unit is often incorporated into the signboard or reduced in size. In that case, it is necessary to prevent the influence of heat from the power supply unit from affecting the LEDs and to make the structure easy to check the power supply.

  In the conventional surface-emitting display devices disclosed in Patent Documents 1 to 6, heat from the LEDs can be radiated. However, broken LEDs cannot be easily replaced. In the surface-emitting display devices disclosed in Patent Documents 7 and 8, a broken LED can be easily replaced, but the heat from the LED cannot be sufficiently dissipated.

  An object of the present invention is to provide a surface-emitting display device that can sufficiently dissipate heat from an LED and can easily replace a broken LED.

  Another object of the present invention is to provide a surface-emitting display device that can easily dissipate and inspect heat generated from a power supply in addition to the above object.

  A surface-emitting display device according to the present invention is disposed along a side of a light guide plate unit including a light guide plate and a heat radiating plate whose front surface is in contact with the back surface of the light guide plate, and emits light into the light guide plate. A plurality of circuit board units each having a plurality of LEDs, a plurality of circuit board unit fixtures each having a plurality of circuit board units mounted thereon, and a plurality of circuit board unit fixtures disposed on the front side of the light guide plate. And a holding structure for holding the light guide plate unit, the marking plate, and the plurality of board unit fixtures so as to expose most of the front surface of the marking plate.

  Note that the light guide plate may have any structure, either a single layer structure or a multilayer structure, as long as it can guide light from a plurality of LEDs into the light guide plate and emit light from the entire front surface of the light guide plate. May be. Of course, the heat radiating plate may have a function as a reflecting plate that reflects light into the light guide plate. The holding structure includes a first portion that has thermal conductivity, has a portion that contacts the back surface of the heat sink, and surrounds the periphery of the light guide plate unit and the indicator plate so as to allow replacement of the plurality of board unit fixtures. And a second structure that covers the plurality of substrate unit fixtures in a state of being combined with the first structure so that the plurality of board unit fixtures cannot be exchanged in cooperation with the first structure. The plurality of board unit fixtures are interchangeably fixed to the first structure in a state where the combination of the second structure and the first structure is released.

  According to the present invention, since the heat conductive attachment with the circuit board unit mounted thereon is replaceably attached to the first structure having heat conductivity, the heat generated in the circuit board unit is Heat is radiated to the first structure through the fixture. In general, it is preferable to use a metal fitting formed by processing a metal plate such as an aluminum plate or a copper plate as the fitting having thermal conductivity. When replacing the circuit board unit, the second structure is removed, the fixture is removed from the first structure, and the circuit board unit is replaced. In this way, even if a failure (LED failure) occurs in one circuit board unit, replacement is easy.

  As the fixture, a board mounting portion to which the circuit board unit is mounted and a board mounting portion that are provided integrally with the board mounting portion and are removably fixed to the first structure when the second structure is removed. What is provided with the to-be-fixed part and the contact part which contacts a part of front surface of a light-guide plate can be used. In this fixture, the contact portion of the fixture also functions as a pressing member for the light guide plate. Therefore, the light guide plate can be easily replaced. Moreover, since heat can be absorbed also from the contact part of a fixture, heat dissipation becomes favorable.

  In addition, it is preferable that the heat sink is provided with the extension part pinched by the to-be-fixed part and the 1st structure. When such an extension is provided, heat dissipation using the heat sink is further improved.

  The surface-emitting display device may further include a power supply device including one or more power supplies that supply power to the plurality of circuit board units. It is preferable that the second structure has a structure in which the power supply device can be accommodated. In this case, it is preferable that the power supply device and the plurality of circuit board units are electrically connected to each other using a wire harness with a connector that can be removed when the second structure is removed. . When a wire harness with a connector is used, the circuit board unit can be easily detached.

  The power supply device is attached to a part of the second structure, and this part is configured to be separated from the first structure separately from the other parts of the second structure. If it does in this way, when inspecting a power supply device, it is only necessary to remove a part of the 2nd structure, and inspection of a power supply device becomes easy. In this case, it is preferable that a part of the second structure has a heat sink function. With such a structure, the heat generated from the power supply device is released to the outside from a part of the second structure body having a heat sink function. Therefore, the heat generated from the power supply device has an influence on the LED of the circuit board unit. Can be prevented or suppressed.

  The first structure preferably includes a frame material that is attached to a fixed portion such as a wall or a ceiling via two or more attachment structures. In this case, the attachment structure can be a structure provided with an anchor bolt fixed to the fixing portion and a position-adjusting fixture that is fixed to the anchor bolt so that the positional relationship between the anchor bolt and the anchor bolt can be adjusted. The position adjustment type fixing tool is fixed to the frame material. When such a position-adjusting type fixing tool is used, the positional relationship between the anchor bolt and the anchor bolt can be adjusted by the position adjusting type fixing tool even when the fixing position of the anchor bolt fixed in advance to the fixing portion is not accurate. It will be easy.

  It is preferable that a plurality of mounting brackets for removably attaching the second structure body are fixed to the frame material at intervals in the longitudinal direction of the frame material. In this case, the second structure is constituted by a plurality of divided structures, and the plurality of divided structures are individually detachably attached to the plurality of mounting brackets. In this way, even when removing the second structure for exchanging the circuit board unit, it is only necessary to remove the divided structure at a position corresponding to the circuit board unit that needs to be exchanged, so that the exchange work is easy. Become.

  In the second structure, it is preferable to form a lead-out hole through which the operation part of the cutoff switch that cuts off the supply of power to the power source can be operated. If the operation part of the shut-off switch is outside the second structure, the work can be started after turning off the shut-off switch when performing inspection and replacement work, thus ensuring work safety. be able to.

  Of course, the present invention may be applied not only to a single-sided surface-emitting display device but also to a double-sided surface-emitting display device. The surface-emitting display device of the present invention can be used for various applications including a signboard.

1 is a front view of an embodiment in which the present invention is applied to a guidance display device used in, for example, a station premises. It is the sectional view on the AA line of FIG. It is the enlarged view of the waist | lumbar part of the BB sectional drawing of FIG. 1 which showed the internal structure of the power supply schematically. FIG. 3 is an enlarged exploded view of a main part of FIG. 2. It is a perspective view of a light-guide plate unit. (A) And (B) is the front view and top view of the structure 107 for holding | maintenance used by 2nd Embodiment of the surface emitting display apparatus of this invention. It is the sectional view on the AA line of FIG. 6 (A). It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG.

  Hereinafter, an example of an embodiment of a surface-emitting display device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an embodiment in which a surface light emitting display device 1 according to an embodiment of the present invention is applied to a guidance display device used in a station premises, for example. The right half of the surface light emitting display device 1 shown in FIG. 1 is shown with the sign plate (display panel) and the light guide plate unit removed, and the left half shows the state where the sign plate 9 described later is fitted. Yes. The surface-emitting display device 1 is attached using two attachment structures 3 at two places on the ceiling. The surface light emitting display device 1 includes a power storage unit 5 and a holding structure 7. Although not shown in FIG. 1, the surface emitting display device 1 is also provided with a sign board (display panel) on which information is written on the back side.

  2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is an enlarged view of the main part of the cross-sectional view taken along the line BB in FIG. 4 is an enlarged exploded view of the main part of FIG. 2, and FIG. 5 is a perspective view of the light guide plate unit. In FIG. 2 to FIG. 4, the cross sections of the details are not hatched for easy understanding.

  The surface light emitting display device 1 uses first and second indicator plates 9 and 11 and first and second light guide plate units 13 and 15 for front light emission display and rear light emission display. The 1st and 2nd marking plates 9 and 11 can be comprised with the board | plate material or sheet | seat which has a light transmittance. For example, the material of the first and second marking plates 9 and 11 is a transparent or milky white plate material such as acrylic or polycarbonate. In the present embodiment, light-transmitting sign plate connecting plates 10 and 12 are attached to the back surfaces of the first and second sign plates 9 and 11, respectively. The sign plate connecting plates 10 and 12 are used to connect two sign plates, and are not necessary when only one sign plate is used. The first and second marking plates 9 and 11 are arranged on the front side of the first and second light guide plate units 13 and 15.

  The first and second light guide plate units 13 and 15 include light guide plates 17 and 19 and heat radiating plates 21 and 23. As will be described in detail later, a plurality of circuit board units 25 and 27 having a plurality of LEDs arranged along one side 13A and 15A of the light guide plate units 13 and 15 and emitting light into the light guide plates 17 and 19 are provided. It has. The light guide plates 17 and 19 may have a single-layer structure or a multi-layer structure as long as light from a plurality of LEDs can be guided into the light guide plates 17 and 19 and can be emitted from the entire front surface of the light guide plates 17 and 19. However, any structure may be used. The heat sinks 21 and 23 are made of a material having high thermal conductivity such as aluminum or copper that dissipates heat from a plurality of LEDs. In the present embodiment, since the heat radiation plates 21 and 23 have a function as a reflection plate that reflects light into the light guide plates 17 and 19, the structure of the light guide plates 17 and 19 of the present embodiment is reflective. The structure is based on the premise of the existence of heat sinks 21 and 23 that function as plates. That is, the heat radiating plates 21 and 23 may have a white sheet for reflection or a white color applied to the surface on the light guide plate side.

  Specifically, the light guide plates 17 and 19 are made of a transparent acrylic plate. Moreover, the heat sinks 21 and 23 of the present embodiment are provided with extensions 21A and 23A extending beyond the light guide plates 17 and 19. The extending portions 21A and 23A are formed with a plurality of through holes (not shown) through which the mounting rivets R pass.

  The holding structure 7 has thermal conductivity and has a portion in contact with the rear surfaces of the heat sinks 21 and 23, and the light guide plate unit allows a plurality of substrate unit fixtures 29 and 27 to be described later to be replaced. 13, 15 and the first structure 71 (76, 77, 78, 79) surrounding the signs 9, 11, and the first structure 71 in combination with the first structure 71, And a second structure 73 that covers the plurality of board unit attachments 29 and 31 so that they cannot be exchanged.

  The holding structure 7 includes the first light guide plate unit in a state where the heat radiating plate 21 of the first light guide plate unit 13 and the heat radiating plate 23 of the second light guide plate unit 15 are opposed to each other with a predetermined interval L therebetween. 13 and the second light guide plate unit 15 are positioned, the first indicator plate 9 is positioned in front of the front surface 17A of the light guide plate 17 of the first light guide plate unit 13, and the second light guide plate unit 15 is guided. With the second marking plate 11 positioned on the front side of the front surface 19A of the optical plate 19, the first and second light guide plate units 13 and 15 and the outer periphery of the first and second marking plates 9 and 11 are surrounded. It has a structure. The space | interval L of the heat sink 21 and the heat sink 23 is for providing an air layer so that heat may not mutually be transmitted, and at least several mm is required. Practically, when the surface emitting display device is enlarged, the mechanical strength of the holding structure 7 is required. For this reason, it is necessary to increase the cross-sectional dimensions of internal reinforcing members 75A to 75E described later so that the strength as a structure increases. In the surface emitting display device 1 used in the station as in the present embodiment, the interval L is 10 mm.

  The holding structure 7 includes a first metal frame member 76 that extends along the plurality of circuit board units 25 and 27 on which a plurality of LEDs are mounted, and a metal that faces the first frame member 76 in the vertical direction. A second frame member 77 made of metal, a third frame member 78 made of metal for connecting the respective end portions of the first and second frame members 76 and 77, a first frame member 76 and a second frame member 76 77, and a metal fourth frame member 79 for connecting the other end of each. Specifically, the first to fourth frame members 76 to 79 are each formed of an extruded product of aluminum. In the present embodiment, among the four frame members 76 to 79, the first and second frame members 76 and 77 are the heat sink 21 of the first light guide plate unit 13 and the second light guide plate unit 15. It is configured to contact the heat radiating plate 23 so that heat can be transferred.

  As shown in FIG. 3 and FIG. 4 in an enlarged manner, the first frame member 76 includes a pair of opposing wall portions 76A and 76B and a connecting wall portion 76C that connects one end of the pair of opposing wall portions 76A and 76B. A long article made of an extruded product of aluminum, comprising an intermediate connecting wall 76D for connecting the inner walls of the pair of opposing walls 76A and 76B, and a first and second pair of ribs 76E and 76F. is there. As shown in FIG. 2, a plurality of rectangular tube structural members 50 to which the second structure 73 is detachably attached are fixed to the first frame member 76 with a gap in the longitudinal direction of the first frame member 76. ing. Specifically, a plurality of holes through which the plurality of mounting bolts B pass are linearly arranged in the longitudinal direction in the connecting wall portion 76C and the intermediate connecting wall portion 76D of the first frame member 76. . The mounting bolt B is tightened with a nut N below the connecting wall portion 76C.

  In the present embodiment, as shown in FIGS. 1 and 4, the internal reinforcement members 75 </ b> A to 75 </ b> E are fixed to the first and second frame members 76 and 77 using the bolt B. The structures of the internal reinforcing members 75A to 75E can be determined by design from the strength required for the surface light emitting device. In the present embodiment, a thin plate having a channel-shaped cross section, a top plate is welded to the end portion in the longitudinal direction, and a hole through which the mounting bolt B passes is formed in the top plate. At a position where the internal reinforcement members 75A to 75E are present, the mounting bolt B is nut-tightened inside the top plate.

  As shown in FIG. 2, the second frame member 77 is integrally formed by extrusion molding similarly to the first frame member 76, and has a long main body 77A and both ends of the long main body 77A in the width direction. It is comprised from a pair of standing wall parts 77B and 77C which stand up from, and central structure part 77D integrally provided in the center of elongate main body 77A. The central structure portion 77D includes a pair of opposed wall portions 77E and 77F that face each other and an intermediate connection wall portion 77G that connects inner walls of the pair of opposed wall portions 77E and 77F. In the long main body 77A, a pair of first slits 77H is formed between the pair of opposed wall portions 77E and 77F of the central structure portion 77D, and a second portion is formed between the pair of standing wall portions 77B and 77C. A pair of ribs 77J and 77K forming the slit 77I is integrally provided. The lower sides of the light guide plate units 13 and 15 are fitted into the pair of first slits 77H, and the lower sides of the marking plates 9 and 11 are fitted into the pair of second slits 77I.

  The third frame material 78 and the fourth frame material 79 shown in FIG. 1 are integrally formed by extrusion molding in the same manner as the first frame material 76, and the first and second frame materials 76 are formed. And 77 are fixed to the end portions of the first and second frame members 76 and 77 by screw members in a state of being fitted to the end portions. In the present embodiment, the first structure 71 includes a first frame member 76, a second frame member 77, a third frame member 78, and a fourth frame member 79. .

  Moreover, in this Embodiment, as shown in FIG. 2, the attachment structure 3 is provided with the support | pillar 3A and the attachment board 3B. The mounting plate 3B is fixed to the square tube structure member 50 constituting a part of the second structure 73 by using two bolts B0 and nuts N0. The two bolts B0 are arranged on both sides of the column 3A and penetrate the mounting plate 3B and the top plate portion 50A of the square tube structure member 50. The two bolts B0 pass through a long hole-shaped through hole 50B formed in the ceiling part 50A of the square tube structure member 50, and a nut N0 is screwed to the tip part thereof. The nut N0 can be attached to the bolt B0 using a through hole 50C formed in the lateral surface of the square tube structure member 50. The square tube structure member 50 is fastened to the first frame member 76 with a bolt B through a bolt hole opened in the lower surface portion 50D.

  As shown in FIG. 2, in a portion that is not the mounting structure 3, a plurality of internal holes of the second structure 73 have a plurality of bolt holes in the vertical plane without the above-described long holes and through holes. The square tube structure member 50 is fastened to the first frame member 76 with a bolt B. The second structure 73 is configured by fastening the outer wall structures (53, 55) constituting the divided structure to the vertical surface of the square tube structure member 50 with bolts 57. The square tube structural member 50 is fixed to the first frame member 76 using bolts B (FIG. 3) at positions corresponding to the internal reinforcement members 75A to 75E shown in FIG.

  Moreover, as shown in FIG. 3, the power supply device 81 is an AC / DC power source that uses AC 100V or 200V on the input side and converts the DC side to 12V or 15V on the output side according to the LED specifications. Accordingly, heat is generated in the circuit, so that it is surrounded by a frame structure 52 made of punching metal. The frame structure 52 is fastened by a screw member 57A and a power heat dissipation plate 54 made of a substantially L-shaped metal plate that fits into the outer wall structural member (53 or 55). The power radiating plate 54 is formed with a screw hole that is used when the screw member 57 is screwed with one of the pair of outer wall structural members 53 and 55 constituting the outer wall structural portion. The power radiating plate 54 holds the power supply device 81 and is fixed to the inner wall of the outer wall structural member (53 or 55) using a screw member 57. By removing the screw member 57 that fastens the pair of outer wall structural members 53 and 55 to the square tube structural member 50, the power supply device 81 is removed to the outside together with taking out the outer wall structural member (53 or 55). Is possible. As a result, according to the present embodiment, the power supply device 81 can be easily inspected and repaired. In this embodiment, a rubber plate (not shown) is laid between the power supply device 81 and the first frame member 76 so as to block the radiant heat from the power supply device 81 from being transmitted to the first frame member 76.

  As shown in FIGS. 3 and 4, in the present embodiment, the outer wall structure members 53 and 55 constituting the outer wall structure portion have a cross-sectional shape in a direction perpendicular to the longitudinal direction (direction perpendicular to the drawing sheet). It has a crank shape. Specifically, the side walls 53A and 55A, the connection walls 53B and 55B that are continuous with the side walls 53A and 55A and along the connection portion 52C of the frame structure 52, and the connection walls 53B and 55B are continuous and orthogonal to the connection portion 52C. It is comprised from the slit formation parts 53C and 55C extended in the direction to do. In the present embodiment, the side walls 53A and 55A constitute the outer wall portion, and the outer surface of the second structure 73 is constituted by the connecting walls 53B and 55B and the slit forming portions 53C and 55C.

  As shown in FIGS. 3 and 4, the slit forming portions 53C and 55C include a pair of side walls 57A and 57B and 59A and 59B that form gaps 54 and 56 therebetween. In the gaps 54 and 56, the sides 9A and 11A of the marking plates 9 and 11 are fitted. That is, the sides 9A and 11A of the marking plates 9 and 11 are surrounded by a pair of side walls 57A and 57B and 59A and 59B that form gaps 54 and 56 therebetween. Further, in a state in which the outer wall structural members 53 and 55 are attached to the frame structure 51, between the side walls 57B and 59B of the slit forming portions 53C and 55C and the opposing wall portions 76A and 76B of the first frame member 76 described above. Are formed with gaps 61 and 63 for accommodating one side of the light guide plate units 13 and 15.

  FIG. 5 shows an enlarged perspective view of the light guide plate unit 15 in a state where the three board unit fixtures 31 to which the circuit board unit 27 is attached are attached. As shown in FIGS. 3 and 4, the board unit fixtures 29 and 31 are made of a metal material having excellent thermal conductivity such as aluminum, and the cross-sectional shape perpendicular to the longitudinal direction is a crank shape. There is no. The board unit fixtures 29 and 31 are fixed to the first flat plate parts 29A and 31A as the fixed parts fixed to the heat radiation plates 21 and 23 of the light guide plate units 13 and 15, and the circuit board units 25 and 27. Second flat plate portions 29B and 31B and third flat plate portions 29C and 31C as contact portions that come into contact with the front surfaces of the light guide plates 17 and 19 are provided. Through holes are formed at both ends in the longitudinal direction of the first flat plate portions 29A and 31A fixed to the heat radiation plates 21 and 23 of the light guide plate units 13 and 15, and plastic rivets R are inserted into the through holes, and the plastic The rivet R passes through the heat radiating plate and is press-fitted into a through hole (not shown) formed in the pair of opposing wall portions 76A and 76B of the first frame member 76. In FIG. 4, the plastic rivet R is shown in a state where it is left on the pair of opposing wall portions 76 </ b> A and 76 </ b> B of the first frame member 76. The plastic rivet R can be easily removed by pulling its head. At both ends in the longitudinal direction of the second flat plate portions 29B and 31B to which the circuit board units 25 and 27 are fixed, a notch C (see FIG. 5) for drawing out the lead wire LL connected to the circuit board unit. Is formed. As shown in FIG. 4, a double-sided tape T having excellent thermal conductivity is disposed between the circuit board units 25 and 27 and the second flat plate portions 29B and 31B to enhance the heat transfer performance between them. .

  As shown in FIG. 3, in the assembled state, the side walls 57B and 59B of the slit forming portions 53C and 55C are in contact with the third flat plate portions 29C and 31C of the board unit fixtures 29 and 31. In this embodiment, in order to improve the heat transfer performance between the side walls 57B and 59B and the third flat plate portions 29C and 31C of the board unit fixtures 29 and 31, a double-sided tape excellent in thermal conductivity between them. T is arranged. Further, as shown in FIG. 4, in the present embodiment, between the heat sinks 21 and 23 and the opposing wall portions 76A and 76B of the first frame member 76, particularly between the portions joined by the plastic rivet R. A double-sided tape T having excellent thermal conductivity is disposed. Therefore, according to the present embodiment, the heat generated from the plurality of LEDs mounted on the circuit board units 25 and 27 is used to form the first frame member 76 and the outer wall constituting the outer wall structure portion via the board unit attachments 29 and 31. Heat can be radiated to the structural members 53 and 55. As a result, the temperature of the LED at the time of light emission can be lowered than before, and the life of the LED can be greatly extended.

  The lead wires drawn out from the circuit board units 25 and 27 constitute a wire harness structure with a connector. A connector provided at the end of the lead wire is detachably connected to a connector device 83 included in a power supply device 81 housed in the second structure 73. Each connector of a plurality of lead wires LL extending from the plurality of circuit board units 25 and 27 is detachably connected to the connector device 83. Therefore, when exchanging the circuit board unit, remove a predetermined outer wall structural member, then remove the connector of the lead wire LL connected to the circuit board unit that needs to be replaced from the connector device 83, and then remove the plastic rivet R. Remove the fixture. Then, a fixture with a new circuit board unit may be attached. In this way, the failed LED can be easily replaced for each circuit board unit, and the replacement operation can be executed in a short time.

  In the present embodiment, for example, one power supply device 81 is provided for every three circuit board units 25 and 27. Therefore, in the present embodiment, the two power supply devices 81 are accommodated in the second structure 73. Particularly in the present embodiment, the power supply device 81 is attached to the outer wall structural member 55 so as to be able to transfer heat. Therefore, at the time of inspection or repair, the power supply device 81 can be easily taken out from the second structure 73 by removing the outer wall structural member 55. Therefore, inspection or repair of the power supply device 81 is facilitated.

  In the above embodiment, the first flat plate portions 29A and 31A as the fixed portions of the substrate unit fixtures 29 and 31 are fixed to the first frame member 76 with the heat sinks 21 and 23 interposed therebetween. You may make it fix to the 1st frame material 76 directly without interposing the heat sinks 21 and 23 in between.

  6 to 10 show a holding structure 107 used in the second embodiment of the surface light emitting display device of the present invention. The same members as those in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals as those in FIGS. Description is omitted. Note that in FIGS. 6 to 10, hatching is not shown in a portion showing a cross section in order to prevent the drawing from being obscured. Compared with the first embodiment, the second embodiment has a longer length in the longitudinal direction, three attachment structures 103 capable of adjusting the attachment position, and the second embodiment. This is different in that the outer wall structural members 153 and 155 constituting a part of the structural body 173 are constituted by a plurality of divided structural bodies 153A to 153E and 155A to 155E, and a cutoff switch SW is mounted. The main differences will be described below.

  As shown in FIGS. 6A and 8, the mounting structure 103 includes an inverted T-shaped fixing member 103A fixed to the first frame member 176, and a T-shaped position adjustment facing the fixing member 103A. Member 103D, and two bolts B1 and nut N1 for fastening them are provided. The fixing member 103A includes a base 103B fixed to the first frame member 176 and an upright wall portion 103C, and the upright wall portion 103C has only walls at both ends with bolt holes and has no wall at the center portion. The position adjusting member 103D is composed of a flat plate portion 103F extending in parallel with the base portion 103B of the fixing member 103A and an upright wall portion 103C ′. The upright wall portion 103C ′ is only at both end portions with bolt holes and has a wall at the center portion. There is no. A long hole 103E extending in the longitudinal direction of the first frame member 176 is formed in the flat plate portion 103F. The position adjusting member 103D is inserted into the anchor bolt AB through the long hole 103E, and the nut N is screwed to the tip of the anchor bolt AB at the center portion without the wall of the standing wall portion 103C '. The mounting structure 103 is fixed by superimposing the upright wall portion 103C 'of the position adjusting member 103D and the upright wall portion 103C of the fixing member 103A, passing the bolt B1 through the bolt holes at both ends, and tightening the nut N1. According to the present embodiment, due to the presence of the long hole 103E, the attachment structure 103 can be attached to the anchor bolt AB even if the attachment position of the anchor bolt AB is inaccurate. Further, since the standing wall portions 103C and 103C 'are overlapped with each other and bolts are passed through the bolt holes on both ends, the bolts can be easily tightened with the nut N1.

  In the present embodiment, as shown in FIG. 6, the outer wall structural members 153 and 155 constituting a part of the second structural body 173 are configured by a plurality of divided structural bodies 153A to 153E and 155A to 155E. The divided structure 153A and the divided structure 153B, and the divided structure 155A and the divided structure 155B are screwed to the mounting bracket 151A fixed to the first frame member 176 as shown in FIG. Similarly, the divided structure 153B and the divided structure 153C, and the divided structure 155B and the divided structure 155C are screwed to the mounting bracket 151B fixed to the first frame member 176, and the divided structure 153C and the divided structure. 153D, the divided structure 155C, and the divided structure 155D are screwed to the mounting bracket 151C fixed to the first frame member 176, and the divided structure 153D, the divided structure 153E, the divided structure 155D, and the divided structure 155E. Is screwed to the mounting bracket 151D fixed to the first frame member 176. Thus, when the outer wall structural members 153 and 155 are configured by the plurality of divided structures 153A to 153E and 155A to 155E, it is only necessary to remove the divided structures at necessary locations during inspection work and replacement work. Can be increased. When inspecting the power supply device 81, the power supply device 181 can be easily pulled out by removing the divided structure 153B.

  Further, in the present embodiment, as shown in FIGS. 6 and 7, a lead-out hole into which the operation portion SB of the cut-off switch SW that cuts off the power supply to the power supply device 81 protrudes into the second structure 173 so as to be operable. H is formed. Thus, if the operation part SB of the cutoff switch (breaker) SW is outside the second structure 173, the work can be started after the cutoff switch SW is turned off when performing inspection and replacement work. As a result, work safety can be ensured.

  Further, in the present embodiment, as shown in FIG. 9, the attachment of the power radiating plate to the power supply device 181 is stopped, and the generated heat is discharged by covering the screw member 157 with a heat conductive metal cover.

  Although the guide hanging signboard used in the station premises has been described as the above embodiment, the present invention can be applied to a sleeve signboard, a standing signboard, and a wall-mounted signboard.

  According to the present invention, since the heat conductive attachment with the circuit board unit mounted thereon is replaceably attached to the first structure having heat conductivity, the heat generated in the circuit board unit is Heat is radiated to the first structure through the fixture. When exchanging the circuit board unit, the circuit board unit can be exchanged by removing the second structure and removing the fixture from the first structure. In this way, even if a failure (LED failure) occurs in one circuit board unit, replacement is easy.

DESCRIPTION OF SYMBOLS 1 Surface emitting display device 7 Structure for holding | maintenance 9,11 Marking plate 13,15 Light guide plate unit 17,19 Light guide plate 21,23 Heat sink 25,27 Circuit board unit 29,31 Mounting tool 51 Frame structure 53,55 Outer wall Structure 71 First structure 73 Second structure 76 First frame material 77 Second frame material 81 Power supply device LED Light emitting diode

Claims (11)

A light guide plate unit comprising a light guide plate and a heat radiating plate in contact with the back surface of the light guide plate; and
A plurality of circuit board units including a plurality of light emitting diodes arranged along one side of the light guide plate unit and emitting light into the light guide plate;
A plurality of substrate unit fixtures having thermal conductivity, wherein the plurality of circuit board units are individually mounted;
A sign plate disposed on the front side of the light guide plate and illuminated by light emitted from the light guide plate;
A structure for holding the light guide plate unit, the sign plate, and the plurality of substrate unit fixtures so as to expose most of the front surface of the sign plate,
The holding structure has thermal conductivity and has a portion in contact with the rear surface of the heat radiating plate, and the periphery of the light guide plate unit and the indication plate so as to allow replacement of the plurality of board unit fixtures. And a second structure that covers the plurality of board unit fixtures so that they cannot be replaced in cooperation with the first structure in a state combined with the first structure. With body,
The plurality of board unit fixtures are fixed to the first structure in a replaceable manner in a state where the combination of the second structure and the first structure is released. A surface-emitting display device.   The board unit fixture includes a board mounting portion to which the circuit board unit is mounted, and the first structure when the second structure is provided integrally with the board mounting section and the second structure is removed. The surface-emitting display device according to claim 1, further comprising: a fixed portion that is detachably fixed to a body; and a contact portion that contacts a part of the front surface of the light guide plate.   The surface-emitting display device according to claim 2, wherein the heat radiating plate includes an extension portion sandwiched between the fixed portion and the first structure. And further comprising one or more power supply devices for supplying power to the plurality of circuit board units,
The second structure has a structure in which the power supply device can be stored.
2. The power supply device and the plurality of circuit board units are electrically connected to each other by using a wire harness with a connector that can be removed when the second structure is removed. A surface-emitting display device as described in 1.   The said power supply device is mounted | worn with a part of said 2nd structure body, The said part is comprised so that it can isolate | separate from the said 1st structure body separately from another part. Surface-emitting display device.   The surface-emitting display device according to claim 5, wherein the part of the second structure has a heat sink function. The first structure includes a frame member that is attached to the fixed portion via two or more attachment structures,
The mounting structure includes an anchor bolt fixed to the fixing portion, and a position adjusting type fixing tool fixed to the anchor bolt so that a positional relationship with the anchor bolt can be adjusted.
The surface emitting display device according to claim 1, wherein the position-adjusting fixture is fixed to the frame member. In the frame material, a plurality of mounting brackets for removably attaching the second structure are fixed at intervals in the longitudinal direction of the frame material,
The surface-emitting display device according to claim 7, wherein the second structure is configured by a plurality of divided structures, and the plurality of divided structures are detachably attached to the plurality of mounting brackets. .   The surface emitting display device according to claim 4, wherein a lead-out hole is formed in the second structure body so that an operation portion of a cutoff switch that cuts off the supply of power to the power source can be operated. A pair of light guide plate units comprising a light guide plate and a heat radiating plate in contact with the back surface of the light guide plate;
A plurality of circuit board units provided with a plurality of light emitting diodes arranged along one side of each of the pair of light guide plate units and emitting light into the light guide plate;
A plurality of substrate unit fixtures having thermal conductivity, wherein the plurality of circuit board units are individually mounted;
A pair of marking plates disposed on the front side of the light guide plate and illuminated by light emitted from the light guide plate;
A holding structure for holding the pair of light guide plate units, the pair of marking plates, and the plurality of substrate unit fixtures so as to expose most of the front surfaces of the pair of marking plates;
The holding structure includes a pair of light guide plate units and the pair of light guide plates so as to have heat conductivity and a portion in contact with a back surface of the heat radiating plate, and allow replacement of the plurality of board unit fixtures. A first structure surrounding the periphery of the marking plate and a combination with the first structure so that the plurality of board unit fixtures cannot be exchanged in cooperation with the first structure. A second structure,
The plurality of board unit fixtures are fixed to the first structure in a replaceable manner in a state where the combination of the second structure and the first structure is released. A surface-emitting display device.   A signboard using the surface-emitting display device according to any one of claims 1 to 10.

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