JP2008218039A - Back light unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a back light unit wherein a substrate mounted with LED light sources can be easily exchanged. <P>SOLUTION: Substrate inserting and removing holes 3 in which the substrate B can be freely inserted and removed together with the LED light sources LS mounted to the substrate and which are in communication with the inside and outside, and a stopper inserting and removing hole 5 in which a stopper 4 individually formed to fix the substrate in a case 2 can be freely inserted and removed and which is in communication with the inside and outside are formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a backlight unit, and more particularly to a backlight unit used for backlighting a liquid crystal display panel.

  2. Description of the Related Art Conventionally, a liquid crystal display device using a liquid crystal display panel in which liquid crystal is sealed between two transparent substrates is known as a type of display device that displays various images such as characters and graphics. In such a liquid crystal display device, a configuration is known in which a display portion of a liquid crystal display panel is brightly displayed using external irradiation light from a backlight called back illumination. In addition, there are various types of backlights for liquid crystal display devices, such as direct type and side light type (edge light type), but one of the light guide types using a light guide. A sidelight type backlight is widely used because it is advantageous in reducing the thickness and measures against heat and making the luminance uniform. In addition, backlights used in small color display liquid crystal display devices such as mobile phones have LED elements (light emitting diodes) as light sources in order to achieve further miniaturization, lower power consumption, and longer life. LED light source using is used.

  According to the backlight of the liquid crystal display device having such a configuration, the light emitted from the LED light source is incident on the incident surface provided on the side surface of the light guide, and the light is multiply reflected inside the light guide. Thus, a surface light source having a light emitting surface as the upper surface of the light guide is used, and light from the light emitting surface can be irradiated as planar light toward the back surface of the liquid crystal display panel (see, for example, Patent Document 1). .

  5 and 6 show an example of a conventional backlight unit, and the conventional backlight unit BL is formed in a thin plate shape having a thickness of about 0.8 mm from a resin such as acrylic or polycarbonate. It has a light guide plate LP. Of the four side surfaces of the light guide plate LP, the side surface shown on the upper right in FIG. 5 is an incident surface LPa for light incident on the inside. In addition, the upper surface of the light guide plate LP is a light emitting surface LPb that irradiates light incident on the light guide plate LP as planar light.

  At a position facing the incident surface LPa of the light guide plate LP, at least one LED light source LS as a light source, in this example, seven LED light sources LS are arranged at a predetermined interval. These LED light sources LS are mounted in a line on one surface of a substrate B provided with a predetermined pattern of wiring. As this substrate B, a flexible film having a thickness of, for example, about 25 μm made of an insulating material such as polyimide, such as a flexible wiring board, or a printed wiring board, A non-flexible laminated plate that is thin and has sufficient strength by an insulating material such as an epoxy resin is used.

  The board B is extended downward from a flat mounting portion Ba on which each LED light source LS is mounted and a position near the left side of FIG. 5 from the central portion of the lower side of the mounting portion Ba shown in FIG. The connecting portion Bb is formed in a horizontally long T shape as a whole. The surface shown on the left side of FIG. 5 of the mounting portion Ba of the substrate B is the mounting surface BaP on which the LED light source LS is mounted. Further, the connection portion Bb is used for electrical connection with an external circuit for supplying power and the like. Furthermore, in each LED light source LS, the light emission surface LSa shown on the left side in FIG. 6 is arranged in parallel with the mounting surface BaP of the substrate B.

  In some cases, a substrate BA (see FIG. 3) in which the light emission surface LSa of the LED light source LS is arranged along the direction orthogonal to the mounting surface BaP may be used.

  The light guide plate LP and the substrate B, specifically, the mounting portion Ba on which the LED light source LS of the substrate B is mounted is housed in the case C. The case C includes a flat bottom plate Ca having a rectangular shape, and four side plates Cb, Cc, Cd, and Ce standing on the four sides of the bottom plate Ca. The upper part of 6 is formed in the planar rectangular shape made into the opening.

  A reflective sheet S (FIG. 6) is fixed to the inner surface of the bottom plate Ca of the case C so as to be in close contact therewith. Further, a connecting portion insertion hole Cf penetrating through the bottom plate Ca in the thickness direction is formed at the upper right side of the bottom plate Ca of FIG. When the substrate B is accommodated inside, the connecting portion Bb of the substrate B is inserted. And in the state which accommodated the board | substrate B in the inside of case C, it arrange | positions so that the whole whole except the connection part with the mounting part Ba of the connection part Bb of the board | substrate B may be exposed outside via the connection part insertion hole Cf. It is formed so that it can be made (FIG. 6).

  Various optical films F (FIG. 6) such as a diffusion sheet and a prism sheet are laminated in this order on the surface of the light guide plate LP shown in FIG. 6. The optical film F includes four side plates of the case C. They are arranged in a space surrounded by Cb, Cc, Cd, and Ce. Moreover, the optical film F is closely fixed on the light emitting surface LPb of the light guide plate LP by a frame-shaped light-shielding double-sided tape T attached to the case C.

  Then, by bringing the outside of the display area of the liquid crystal display panel PL mounted on the upper surface of the case C into intimate contact with the upper surface of the frame-shaped light-shielding double-sided tape T, as shown in FIG. Are integrated.

  5 and 6, the thickness direction and the depth direction are exaggerated.

JP 2002-277873 A

  By the way, in recent years, there is a demand for replacing the substrate B on which the LED light source LS is mounted because the color tone or luminance of the light source is desired to be changed.

  However, the conventional backlight unit BL has a problem that the substrate B cannot be easily replaced.

  For example, in order to remove the substrate B from the backlight unit BL integrated with the liquid crystal display panel PL, after peeling the liquid crystal display panel PL from the backlight unit BL, the frame-shaped light-shielding double-sided tape T, optical film from the backlight unit BL An operation of exchanging the substrate B after removing F is performed.

  When performing this replacement work, the frame-shaped light-shielding double-sided tape T, the optical film F, and the light guide plate LP are damaged or broken and cannot be reused. As a result, the industrial waste increases.

  Therefore, there is a need for a backlight unit that can easily replace the substrate on which the LED light source is mounted from the backlight unit.

  This invention is made | formed in view of this point, and it aims at providing the backlight unit which can replace | exchange the board | substrate which mounted the LED light source easily.

  In order to achieve the above-described object, the backlight unit according to the present invention is characterized in that a light guide plate and a substrate on which an LED light source arranged to face at least one side surface of the light guide plate is mounted. In the backlight unit housed inside, the case is inserted into and removed from the case together with the LED light source mounted on the substrate, and the substrate is inserted into and removed from the case, and the substrate is fixed in the case. This is in that a separately formed stopper for insertion and removal is provided, and a stopper insertion / removal hole communicating between the inside and the outside is formed. And by employ | adopting such a structure, the board | substrate which mounted the LED light source can be replaced | exchanged easily, without affecting other components.

  The case includes a rectangular bottom plate and four side plates erected on four sides of the bottom plate, and is formed in a planar rectangular shape with an emission side opened, and the light emission surface of the LED light source Is disposed parallel to the mounting surface of the substrate on which the LED light source is mounted, the substrate insertion / removal hole is formed on at least one side of the bottom plate of the case, and the stopper is formed in a flat plate shape. The stopper insertion / removal hole is a side plate erected on at least one of two sides adjacent to the side of the bottom plate where the substrate insertion / removal hole is provided, and the substrate insertion / removal hole Preferably, the longitudinal direction of the stopper insertion / removal hole is parallel to the longitudinal direction of the side plate. And by employ | adopting such a structure, the board | substrate arrange | positioned in parallel with the mounting surface in which the light emission surface of a LED light source mounts the LED light source of a board | substrate can be performed easily.

  The case includes a rectangular bottom plate and four side plates erected on four sides of the bottom plate, and is formed in a planar rectangular shape with an emission side opened, and the light emission surface of the LED light source Is disposed in a direction perpendicular to the mounting surface of the substrate on which the LED light source is mounted, the substrate insertion / removal hole is formed in at least one of the four side plates of the case, and the stopper is It is formed in a flat plate shape, and the stopper insertion / removal hole is at least one side plate of two side plates adjacent to the side plate provided with the substrate insertion / removal hole, and the substrate insertion / removal hole is formed. Preferably, the longitudinal direction of the stopper insertion / removal hole is a width direction orthogonal to the longitudinal direction of the side plate. And by employ | adopting such a structure, the board | substrate currently arrange | positioned along the direction orthogonal to the mounting surface where the light emission surface of a LED light source mounts the LED light source of a board | substrate can be performed easily. it can.

  It is preferable that a locking projection for locking the stopper is formed in the stopper insertion / removal hole. By adopting such a configuration, it is possible to easily and reliably hold the stopper in the case.

  According to the backlight unit of the present invention, the substrate on which the LED light source is mounted can be detached from the case through the substrate insertion / removal hole after the stopper is separated from the case through the stopper insertion / removal hole. Since the board can be fixed in the case by inserting the stopper into the case through the stopper insertion / removal hole after inserting the board on which the LED light source is mounted through the insertion / removal hole. It is possible to obtain an excellent effect such as easily replacing the substrate.

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 and 2 show a first embodiment of a backlight unit according to the present invention. FIG. 1 is an exploded perspective view showing a simplified main part, and FIG. 2 is a partially enlarged sectional view of the main part. .

  Since the backlight unit of the present embodiment is the same as the conventional one described above except for the case and the stopper, the same or corresponding configurations as those of the conventional one described above are denoted by the same reference numerals in the drawings. Detailed description thereof is omitted.

  As shown in FIGS. 1 and 2, the backlight unit 1 of the present embodiment has a light guide plate LP. Of the four side surfaces of the light guide plate LP, the side surface shown on the upper right in FIG. 1 is an incident surface LPa for light incident on the inside. Then, at a position facing the incident surface LPa of the light guide plate LP, at least one LED light source LS as a light source, in the present embodiment, is disposed at a predetermined interval.

  The incident surface LPa of the light guide plate LP only needs to be provided on at least one of the four side surfaces, and two opposing side surfaces of the four side surfaces according to the design concept or the like. Or two adjacent sides, or three adjacent sides.

  The LED light sources LS are mounted in a line on one surface of the substrate B. The board B extends downward from a position close to the left side in FIG. 1 from a flat plate-shaped mounting part Ba on which each LED light source LS is mounted and a central part of the lower side shown in FIG. 1 of the mounting part Ba. As a whole, the connecting portion Bb is formed in a horizontally long T-shape. One surface shown on the left side of the mounting portion Ba of the substrate B in FIG. 1 is a mounting surface BaP on which the LED light source LS is mounted. Each LED light source LS has a light emission surface LSa shown on the left side of FIG. 2 arranged in parallel with the mounting surface BaP of the substrate B.

  If the surface of the substrate B is a light reflecting surface, light emitted from the radiation surface LSa of the LED light source LS is efficiently incident on the incident surface LPa of the light guide plate LP, or light leaked from the light guide plate LP is guided to the light guide plate. This is preferable in the sense that it can be incident again on the incident surface LPa of the LP.

  When the incident surface LPa of the light guide plate LP is provided on a plurality of side surfaces among the four side surfaces, the substrates B are respectively disposed at positions facing the respective side surfaces.

  The light guide plate LP and the substrate B, specifically, the mounting portion Ba on which the LED light source LS of the substrate B is mounted is housed in the case 2. The case 2 includes a rectangular bottom plate 2a having a rectangular shape and four side plates 2b, 2c, 2d, and 2e provided upright on four sides of the bottom plate 2a. The upper part of 2 is formed in a planar rectangular shape with an opening.

  A reflection sheet S (not shown) is fixed to the inner surface of the bottom plate 2a of the case 2 so as to be in close contact therewith. Further, a board insertion / removal hole 3 penetrating through the bottom plate 2a in the thickness direction is formed on the long side, which is the upper right side of the bottom plate 2a of the case 2 shown in FIG. It is formed so that at least the mounting portion Ba of the substrate B can be inserted into and removed from the case 2 together with the LED light sources LS.

  That is, the board insertion / removal hole 3 only needs to be formed on at least one side of the bottom plate 2 a of the case 2.

  In addition, as the shape of the board | substrate insertion / removal hole 3, it should just be formed so that the mounting part Ba of the board | substrate B can be inserted / removed with each LED light source LS at least.

  That is, as the shape of the board insertion / removal hole 3, the narrow slot-like small hole 3a through which the mounting part Ba of the board B can be inserted / removed in the thickness direction and the mounting part Ba of the LED light source LS correspond to the LED light source. Any shape may be used as long as the large rectangular holes 3b that can be inserted and removed together with the LS are alternately arranged along the longitudinal direction of the long side.

  Therefore, when the substrate B is accommodated in the case 2, the substrate B is inserted into the substrate insertion / removal hole 3. In the state where the substrate B is accommodated in the case C, the substrate B The connection part Bb is formed so as to be exposed to the outside through the board insertion / removal hole 3.

  The length dimension along the longitudinal direction of the mounting portion Ba of the substrate B is determined by the distance between the opposed inner surfaces of the two side plates 2c and 2e arranged along the short direction of the bottom surface 2a of the case 2. It is short.

  In addition, when the incident surface LPa of the light guide plate LP is two opposing side surfaces among the four side surfaces, two adjacent side surfaces, or three adjacent side surfaces, the incident surface LPa is obtained. What is necessary is just to set the arrangement | positioning position of the board | substrate B, and the formation position of the board | substrate insertion / extraction hole 3 according to the side surface of the light-guide plate LP.

  An individually formed stopper 4 for fixing the substrate B in the case 2 is disposed inside the case 2. The stopper 4 of the present embodiment is formed in an elongated flat plate shape, and as shown in FIG. 2, the upper surface shown in the upper part of FIG. 2 is a side surface orthogonal to the radiation surface LSa of the LED light source LS mounted on the substrate B. 2 are arranged so that the lower surface shown below in FIG. 2 faces the inner surface of the bottom plate 2a of the case 2. Further, the right side surface (right end surface) of the stopper 4 shown in the right side of FIG. 2 faces the mounting surface BaP of the substrate B, and the left side surface (left end surface) of the stopper 4 shown in the right side of FIG. It arrange | positions so that the entrance plane LPa side may be opposed.

  If the surface of the stopper 4 is a light reflecting surface, light emitted from the radiation surface LSa of the LED light source LS is efficiently incident on the incident surface LPa of the light guide plate LP, or light leaked from the light guide plate LP is guided to the light guide plate. This is preferable in the sense that it can be incident again on the incident surface LPa of the LP.

  As shown in FIG. 1 in an enlarged manner, the side plate 2c located on the right side of the case 2 in FIG. The stopper insertion / removal hole 5 is formed in a horizontally long rectangular shape so as to penetrate the side plate 2c in the thickness direction so as to communicate with the inside and outside. Further, the stopper insertion / removal hole 5 is formed on the side plate 2c erected on one side shown on the right side in FIG. 1 of the two sides adjacent to the side where the substrate insertion / removal hole 3 of the bottom plate 2a is provided. Has been. Further, the stopper insertion / removal hole 5 is provided at the end of the side plate 2c on the side where the substrate insertion / removal hole 3 is formed, and the longitudinal direction of the stopper insertion / removal hole 5 is parallel to the longitudinal direction of the side plate 2c. Yes.

  The stopper insertion / removal hole 5 is formed with a locking projection 6 for locking the stopper 4 as shown exaggeratedly in FIG. The locking projection 6 of the present embodiment is disposed at the center of the upper inner surface of the stopper insertion / removal hole 5 and is formed in a convex arc shape toward the lower inner surface facing the upper inner surface. Then, by pressing the upper surface of the stopper 4 with the top of the locking projection 6, the stopper 4 is locked between the top of the locking projection 6 and the lower inner surface facing the top. Can be done.

  Of course, the stopper 4 can be moved along the longitudinal direction by manual operation while the stopper 4 is locked between the top of the locking projection 6 and the lower inner surface facing the top. Is formed.

  In the case of a configuration in which one stopper 4 is disposed in the case 2, the board insertion / removal holes 3 are provided in the two side plates 2c, 2e adjacent to the side plate 2b provided with the board insertion / removal holes 3, respectively. You may form so that it may mutually oppose. In this case, it is preferable that both ends of the stopper 4 in the length direction are flush with the outer surface of the case 2 in the sense that the stopper 4 can be easily detached from the case 2.

  That is, when the stopper 4 is detached from the case 2, the other end in the longitudinal direction can be easily projected outside the case 2 by pushing one end in the longitudinal direction of the stopper 4. Thus, the stopper 4 can be easily detached from the case 2.

  Of course, the number and arrangement of the stoppers 4 may be set according to the number and arrangement of the substrates B.

  Therefore, the board insertion / removal hole 3 only needs to be formed on at least one side of the bottom plate 2 a of the case 2. The stopper insertion / removal hole 5 is a side plate erected on at least one of the two sides adjacent to the side where the substrate insertion / removal hole 3 of the bottom plate 2a is provided. Is provided at the end of the side where the stopper is inserted, and the longitudinal direction of the stopper insertion / removal hole 5 may be parallel to the longitudinal direction of the side plate.

  In other words, the stopper insertion / removal holes 5 only need to be formed in parallel with the bottom plate 2a on either one of the side plates erected at both ends of the board insertion holes 3 in the extending direction.

  For example, when the substrate insertion holes 3 are provided on the upper side and the lower side of the bottom plate 2a, the stopper insertion / removal hole 5 of the stopper 4 with respect to the substrate insertion hole 3 provided on the upper side is a bottom plate adjacent to the upper side. It is formed in parallel with the bottom plate 2a on the upper side of one of the side plates located on the left side and the right side of 2a. Further, the stopper insertion / removal hole 5 of the stopper 4 with respect to the board insertion hole 3 provided on the lower side has a bottom plate 2a on the lower side of one of the left side and the right side of the bottom plate 2a adjacent to the lower side. They will be formed in parallel. Of course, when the substrate insertion hole 3 is provided on the left side of the bottom plate 2a, the stopper insertion / removal hole 5 of the stopper 4 with respect to the substrate insertion hole 3 provided on the left side is the upper side of the bottom plate 2a adjacent to the left side and It is formed in parallel with the bottom plate 2a on the left side of one of the side plates located on the lower side. When the substrate insertion hole 3 is provided on the right side of the bottom plate 2a, the stopper insertion / removal hole 5 of the stopper 4 with respect to the substrate insertion hole 3 provided on the right side is an upper side of the bottom plate 2a adjacent to the right side and It is formed in parallel with the bottom plate 2a on the right side of any one of the side plates located on the lower side. And the board | substrate penetration hole 3 is provided in a some edge | side by combining these.

  The number, shape, and arrangement of the locking projections 6 can be changed according to the design concept and the like. Note that the locking projection 6 may be provided on the stopper 4.

  Various optical films F (FIG. 2) are laminated in this order on the surface of the light guide plate LP shown in FIG. 2, and each optical film F includes four side plates 2 b, 2 c, 2 d of the case 2. 2e is disposed in a space surrounded by 2e. Further, each optical film F is closely fixed on the light emitting surface LPb of the light guide plate LP by a frame-shaped light-shielding double-sided tape T attached to the case 2. Then, by bringing the outside of the display area of the liquid crystal display panel PL shown by the two-dot chain line in FIG. 2 mounted on the upper surface of the case 2 into close contact with the upper surface of the frame-shaped light-shielding double-sided tape T, as shown in FIG. The light unit 1 and the liquid crystal display panel PL are integrated.

  In FIGS. 1 and 2, the thickness direction and the depth direction are exaggerated.

  Next, the operation of the present embodiment having the above-described configuration will be described.

  First, in the backlight unit 1 of the present embodiment, an operation of removing (detaching) the substrate B from the case 2 in order to replace the substrate B will be described.

  When removing the substrate B from the case 2, the stopper insertion / removal hole 5 is formed against the force holding the stopper 4 between the top of the locking projection 6 and the lower inner surface facing the top. Then, the stopper 4 is pulled out from the case 2. Then, since the stopper 4 interposed between the board insertion / removal hole 3 and the LED light source LS accommodated in the case 2 is eliminated, the stopper 4 is inserted through the board insertion / removal hole 3 formed in the bottom plate 2a of the case 2. Can be removed from the bottom plate 2a side.

  That is, the substrate B can be removed from the case 2 of the backlight unit 1 from the bottom plate 2a side without affecting other components such as the light guide plate LP, the reflection sheet S, the optical film F, and the frame-shaped light-shielding double-sided tape T. Easy and reliable.

  Next, an operation of attaching (fixing) a new substrate B to the backlight unit 1 of the present embodiment will be described.

  When the substrate B is attached to the case 2 of the backlight unit 1, the substrate B, more specifically, the mounting portion Ba on which the LED light source LS is mounted is connected to the case through the substrate insertion / removal hole 3 formed in the bottom plate 2 a of the case 2. 2 is inserted and stored from the bottom plate 2a side.

  Next, in this state, the stopper 4 is inserted into the case 2 through the stopper insertion / removal hole 5 formed in the side plate 2 c of the case 2. Then, as shown in FIG. 2, the stopper 4 is disposed so that the upper surface of the stopper 4 faces the side surface orthogonal to the radiation surface LSa of the LED light source LS mounted on the substrate B, and the lower surface faces the inner surface of the bottom plate 2a of the case 2. At the same time, the right side surface of the stopper 4 faces the mounting surface BaP of the substrate B, and the left side surface of the stopper 4 faces the incident surface LPa side of the light guide plate LP. As a result, since the stopper 4 is disposed between the board insertion / removal hole 3 and the LED light source LS housed in the case 2, it is possible to easily prevent the board B from dropping from the case 2. The substrate B can be fixed in the case 2. Further, the stopper 4 is held in the case 2 by the locking projection 6 of the stopper insertion / removal hole 5.

  That is, it is possible to easily and reliably attach the substrate B to the case 2 from the bottom plate 2a side without affecting other components.

  Thus, according to the backlight unit 1 of the present embodiment, the board insertion / removal hole 3 that allows the board B to be inserted into and removed from the case 2 together with the LED light source LS mounted on the board B and communicates with the inside and outside, and the board Since the stopper 4 formed individually for fixing B in the case 2 is detachable and has a stopper insertion / removal hole 5 communicating between the inside and the outside, without affecting other components. The board B on which the LED light source LS is mounted can be easily replaced. This is useful for preventing the occurrence of environmental pollution because the industrial waste that has been generated can be eliminated.

  Further, according to the backlight unit 1 of the present embodiment, the case 2 includes the rectangular bottom plate 2a and the four side plates 2b, 2c, 2d, and 2e that are erected on the four sides of the bottom plate 2a. The light emitting surface LSa of the LED light source LS is arranged in parallel with the mounting surface BaP on which the LED light source LS of the substrate B is mounted, and the substrate insertion / removal hole 3 is formed. Is formed on at least one side of the bottom plate 2a of the case 2, the stopper 4 is formed in a flat plate shape, and the stopper insertion / removal hole 5 is adjacent to the side where the substrate insertion / removal hole 3 of the bottom plate 2a is provided. The side plate 2c is erected on at least one of the two sides, and is provided at an end portion on the side where the board insertion / removal hole 3 is formed. The longitudinal direction of the stopper insertion / removal hole 5 is the side plate. LED light source LS because it is parallel to the longitudinal direction of 2c Can be exchanged substrate B radiation surface LSa of light is parallel to the mounting surface BaP the LED light source LS of the substrate B is mounted easily.

  Further, according to the backlight unit 1 of the present embodiment, the stopper insertion / removal hole 5 is formed with the locking projection 6 for locking the stopper 4, so that the stopper 4 is held by the case 2. Can be easily and reliably.

  3 and 4 show a second embodiment of the backlight unit according to the present invention. FIG. 3 is an exploded perspective view showing the main part in a simplified manner, and FIG. 4 is a partially enlarged sectional view of the main part. is there.

  The backlight unit of the present embodiment exemplifies a case where a substrate in which the light emission surface of the LED light source is arranged along a direction orthogonal to the mounting surface is used.

  As shown in FIGS. 3 and 4, the substrate BA of the backlight unit 11 of the present embodiment is such that the light emission surface LSa shown on the left side of FIG. 4 of each LED light source LS is perpendicular to the mounting surface BaP of the substrate B. Are arranged along.

  The case 12 of the backlight unit 11 according to the present embodiment includes a bottom plate 12a and four side plates 12b, 12c, 12d, and 12e provided upright on the four sides of the bottom plate 12a. The upper part of FIG. 3 is formed in a planar rectangular shape having an opening. Then, the case 12 is inserted into and removed from the side plate 12b in the thickness direction so as to communicate with the inside and outside of the case 12 on the side of the connecting portion with the bottom plate 12a of the side plate 12b located diagonally right above shown in FIG. A hole 13 is formed so that at least the mounting portion Ba of the substrate BA can be inserted into and removed from the case 12 together with the LED light sources LS.

  The shape of the board insertion / removal hole 13 is formed so that at least the mounting portion Ba of the board BA can be inserted / removed together with each LED light source LS, similarly to the board insertion / removal hole 3 of the first embodiment described above. It only has to be done.

  That is, as the shape of the board insertion / removal hole 13, the small slot 13a having a narrow slot that allows the mounting part Ba of the board BA to be inserted / removed in the thickness direction and the mounting part Ba of the LED light source LS correspond to the LED light source. What is necessary is just to arrange | position alternately the planar rectangular large hole 13b which can be inserted or removed with LS along the longitudinal direction of the side plate 12b.

  The board insertion / removal hole 13 may be formed in at least one of the four side plates 12b, 12c, 12d, and 12e of the case 12.

  The stopper 14 of the present embodiment is formed in an elongated flat plate shape, and as shown in FIG. 4, the back surface opposite to the radiation surface LSa of the LED light source LS mounted on the substrate B with one surface shown on the left side of FIG. 4, and the other surface shown on the right side of FIG. 4 is disposed so as to face the inner surface of the side plate 12 b of the case 12. Also, the lower end surface of the stopper 14 shown in the lower part of FIG. 4 faces the mounting surface BaP of the substrate BA, and the upper left end surface of the stopper 14 shown in FIG. 4 is arranged on the opening side.

  The stopper insertion / removal hole 15 of the present embodiment is formed in the side plate 12c located on the diagonally lower right side of FIG. The stopper insertion / removal hole 15 is formed in a vertically long rectangular shape so as to penetrate the side plate 12c in the thickness direction so as to communicate with the inside and outside. Furthermore, the stopper insertion / removal hole 15 is provided at the end of the side plate 12c on the side where the substrate insertion / removal hole 13 is formed, and the longitudinal direction of the stopper insertion / removal hole 15 is relative to the longitudinal direction of the side plate 12c. The width direction is orthogonal (the short direction shown in the vertical direction in FIG. 3).

  As shown in an exaggerated manner in FIG. 3, the locking protrusion 16 of the present embodiment is disposed at the center of the left inner surface where the stopper insertion / removal hole 15 is long, and is formed on the right inner surface facing the left inner surface. It is formed in a convex arc shape. Then, the stopper 14 is sandwiched between the top of the locking projection 16 and the right inner surface facing the top by pressing one surface of the stopper 14 shown in the left side of FIG. 4 with the top of the locking projection 16. Thus, it can be locked.

  Of course, the stopper 14 can be moved along its longitudinal direction by a manual operation while the stopper 14 is locked between the top of the locking projection 16 and the lower inner surface facing the top. Is formed.

  The number and arrangement of the board insertion / removal holes 13, the stopper insertion / removal holes 15, and the stoppers 14 may be set according to the number and arrangement of the boards BA.

  Therefore, the board insertion / removal hole 13 may be formed in at least one of the four side plates 12b, 12c, 12d, and 12e of the case 12. The stopper insertion / removal hole 15 is at least one of the two side plates adjacent to the side plate on which the substrate insertion / removal hole 13 is provided, on the side where the substrate insertion / removal hole 13 is formed. It is only necessary that the longitudinal direction of the stopper insertion / removal hole 15 provided at the end is a width direction orthogonal to the longitudinal direction of the side plate.

  In other words, the stopper insertion / removal holes 15 may be formed on either one of the side plates provided upright at both ends in the extending direction of the substrate insertion holes 13 so as to be orthogonal to the bottom plate 12a.

  For example, when the board insertion hole 13 is provided in each of the side plate (upper plate) standing on the upper side of the bottom plate 12a and the side plate (lower plate) standing on the lower side, the board insertion hole 13 is provided on the upper plate. The stopper insertion / removal hole 15 of the stopper 14 with respect to the board insertion hole 13 is formed to be orthogonal to the bottom plate 12a on the upper plate side of either the left side plate or the right side plate adjacent to the upper side plate. become. Further, the stopper insertion / removal hole 15 of the stopper 14 with respect to the board insertion hole 13 provided in the lower side plate is located on the lower side of either the left side plate or the right side plate adjacent to the lower side plate with respect to the bottom plate 12a. It is formed so as to be orthogonal. Of course, when the board insertion hole 13 is provided in the left side plate, the stopper insertion / removal holes 15 of the stopper 14 with respect to the board insertion hole 13 provided in the left side plate are the upper side plate and the lower side plate adjacent to the left side plate. Is formed so as to be orthogonal to the bottom plate 12a on the left side of one of the plates. Further, when the board insertion hole 13 is provided in the right side plate, the stopper insertion / removal holes 15 of the stopper 14 with respect to the board insertion hole 13 provided in the right side plate are the upper side plate and the lower side plate adjacent to the right side plate. Is formed on the right side plate side of one of them so as to be orthogonal to the bottom plate 12a. And the board | substrate penetration hole 13 is provided in a some side plate by combining these.

  The number, shape, and arrangement of the locking protrusions 16 can be changed according to the design concept and the like. The locking protrusion 16 may be provided on the stopper 14.

  In addition, about another structure, since it is the same as that of the backlight unit 1 of 1st Embodiment mentioned above, the same code | symbol is attached | subjected in drawing and the detailed description is abbreviate | omitted.

  Next, an operation of attaching (fixing) a new substrate B to the backlight unit 11 of the present embodiment will be described.

  First, in the backlight unit 11 of this embodiment, an operation of removing (separating) the substrate BA from the case 12 in order to replace the substrate BA will be described.

  When removing the substrate BA from the case 12, the stopper insertion / removal hole 15 is formed against the force holding the stopper 14 between the top of the locking projection 16 and the lower inner surface facing the top. Then, the stopper 14 is pulled out from the case 12. Then, since the stopper 14 interposed between the board insertion / removal hole 13 and the LED light source LS housed in the case 12 is eliminated, the stopper 14 is interposed via the board insertion / removal hole 13 formed in the side plate 12b of the case 12. Can be removed from the side plate 12b side.

  That is, the substrate BA from the case 12 of the backlight unit 11 and thus the LED light source LS is moved from the side plate 12b without affecting other components such as the light guide plate LP, the reflection sheet S, the optical film F, and the frame-shaped light-shielding double-sided tape T. It can be easily and reliably removed from the side.

  Next, an operation of attaching (fixing) a new substrate BA to the backlight unit 11 of the present embodiment will be described.

  When the board BA is attached to the case 12 of the backlight unit 11, the board BA, more specifically, the mounting portion Ba on which the LED light source LS is mounted is placed through the board insertion / removal hole 13 formed in the side plate 12b of the case 12. 12 is inserted and stored from the side plate 12b side.

  Next, in this state, the stopper 14 is inserted into the case 12 through the stopper insertion / removal hole 15 formed in the side plate 12 c of the case 12. Then, as shown in FIG. 4, one surface of the stopper 14 shown on the left side of FIG. 4 faces the back surface opposite to the radiation surface LSa of the LED light source LS mounted on the substrate BA, and the other shown on the right side of FIG. 4 is disposed so that the surface faces the side plate 12b of the case 12, and the lower end surface of the stopper 14 shown in the lower part of FIG. 4 faces the mounting surface BaP of the substrate BA, and the upper left end of the stopper 14 shown in FIG. The surface is arranged on the opening side. As a result, since the stopper 14 is disposed between the board insertion / removal hole 13 and the back surface of the LED light source LS housed in the case 12, it is possible to easily prevent the board BA from falling off the case 12. In addition, the substrate BA can be fixed in the case 12. The stopper 14 is held by the case 12 by the locking projection 16 of the stopper insertion / removal hole 15.

  That is, it is possible to easily and reliably attach the substrate BA to the case 12 from the side plate 12b side without affecting other components.

  Thus, according to the backlight unit 11 of the present embodiment, the same effects as those of the backlight unit 11 of the first embodiment described above can be achieved.

  That is, according to the backlight unit 11 of the present embodiment, the substrate BA is inserted into the case 12 together with the LED light source LS mounted on the substrate BA and the substrate BA can be inserted and removed, and the substrate BA is connected to the inside and outside. The individually formed stoppers 14 for fixing in the case 12 are detachably inserted, and the stopper insertion / removal holes 15 communicating between the inside and the outside are formed, so that the LED light source is not affected without affecting other components. The board BA on which the LS is mounted can be easily replaced. This is useful for preventing the occurrence of environmental pollution because the industrial waste that has been generated can be eliminated.

  Further, according to the backlight unit 11 of the present embodiment, the case 12 includes the rectangular bottom plate 12a and the four side plates 12b, 12c, 12d, and 12e provided upright on the four sides of the bottom plate 12a. The side of the LED light source LS is formed in a planar rectangular shape, and the light emission surface LSa of the LED light source LS is arranged along the direction orthogonal to the mounting surface BaP on which the LED light source LS of the substrate BA is mounted. The insertion / removal hole 13 is formed in at least one side plate 12b of the four side plates 12b, 12c, 12d, 12e of the case 12, the stopper 14 is formed in a flat plate shape, and the stopper insertion / removal hole 15 is The end on the side where the board insertion / removal hole 13 is formed, at least one of the two side boards 12c, 12e adjacent to the side plate 12b provided with the board insertion / removal hole 13 Since the longitudinal direction of the stopper insertion / removal hole 15 is a width direction orthogonal to the longitudinal direction of the side plate 12c, the light emission surface LSa of the LED light source LS is mounted on the LED light source LS of the substrate BA. The substrate BA disposed along the direction orthogonal to the surface BaP can be easily replaced.

  Further, according to the backlight unit 11 of the present embodiment, the stopper insertion / removal hole 15 is formed with the locking protrusion 16 for locking the stopper 14, so that the stopper 14 is held by the case 12. Can be easily and reliably.

  The backlight unit of the present invention can be used for an existing backlight unit.

  In addition, this invention is not limited to each embodiment mentioned above, A various change is possible as needed.

The exploded perspective view which simplifies and shows the principal part of 1st Embodiment of the backlight unit which concerns on this invention. The partial expanded sectional view which shows the principal part of the backlight unit of FIG. The exploded perspective view which simplifies and shows the principal part of 2nd Embodiment of the backlight unit which concerns on this invention. The partial expanded sectional view which shows the principal part of the backlight unit of FIG. Exploded perspective view showing an essential part of an example of a conventional backlight unit in a simplified manner The partial expanded sectional view which shows the principal part of the backlight unit of FIG.

Explanation of symbols

1, 11 Backlight unit 2, 12 Case 2a, 12a Bottom plate 2b, 2c, 2d, 2e, 12b, 12c, 12d, 12e Side plate 3, 13 Substrate insertion / removal hole 4, 14 Stopper 5, 15 Stopper insertion / removal hole 6, 16 Protrusion for locking LP Light guide plate LPa Incident surface LPb Light emitting surface LS LED light source LSa Radiation surface B, BA Substrate Ba Mounting portion Bb Connection portion BaP Mounting surface S Reflective sheet F Optical film PL Liquid crystal display panel

Claims (4)

In a backlight unit in which a light guide plate and a substrate on which an LED light source is disposed so as to face at least one side surface of the light guide plate are housed in a case,
A board insertion / removal hole through which the board can be inserted and removed together with the LED light source mounted on the board and communicated with the inside and outside of the case, and a stopper formed individually for fixing the board in the case are inserted into the case. A backlight unit characterized in that it is formed with a stopper insertion / removal hole that is detachable and communicates inside and outside. The case includes a rectangular bottom plate and four side plates erected on four sides of the bottom plate, and is formed in a planar rectangular shape having an opening on the emission side,
The light emitting surface of the LED light source is disposed in parallel with the mounting surface of the substrate on which the LED light source is mounted,
The board insertion / removal hole is formed on at least one side of the bottom plate of the case,
The stopper is formed in a flat plate shape,
The stopper insertion / removal hole is a side plate erected on at least one of two sides adjacent to the side of the bottom plate where the substrate insertion / removal hole is provided, and the substrate insertion / removal hole is formed. 2. The backlight unit according to claim 1, wherein the backlight unit is provided at an end portion of the side plate, and the longitudinal direction of the stopper insertion / removal hole is parallel to the longitudinal direction of the side plate. The case includes a rectangular bottom plate and four side plates erected on four sides of the bottom plate, and is formed in a planar rectangular shape having an opening on the emission side,
The light emission surface of the LED light source is disposed in a direction orthogonal to the mounting surface of the substrate on which the LED light source is mounted,
The board insertion / removal hole is formed in at least one of the four side plates of the case;
The stopper is formed in a flat plate shape,
The stopper insertion / removal hole is at least one side plate of two side plates adjacent to the side plate on which the substrate insertion / removal hole is provided, and the end portion on the side where the substrate insertion / removal hole is formed. The backlight unit according to claim 1, wherein a longitudinal direction of the stopper insertion / removal hole is a width direction orthogonal to a longitudinal direction of the side plate.   The backlight unit according to any one of claims 1 to 3, wherein a locking projection for locking the stopper is formed in the stopper insertion / removal hole.

Images