JP5735439B2 - Mounting board fixing member, lighting device, and liquid crystal display device - Google Patents

Description

  The present invention relates to a mounting board fixing member used for fixing a plurality of mounting boards on which light sources are mounted to a bottom plate of an illuminating device, an illuminating apparatus in which the plurality of mounting boards are fixed to the bottom plate by the fixing member, and an illumination thereof The present invention relates to a liquid crystal display device provided with the device.

  Conventionally, a backlight in which a mounting substrate (light emitting substrate) on which a light source (for example, an LED (light emitting diode)) is mounted is fixed to a chassis (bottom plate) by a fixing portion has been proposed. For example, in the backlight of Patent Document 1, a clip (fixed portion) that is inserted into a hole portion of the chassis and engages with the chassis is provided with a flange portion, and the light emission substrate is sandwiched between the flange portion and the chassis, thereby I try to fix it. In addition, a latching claw that can be elastically deformed is provided at the tip of the clip (on the insertion side to the chassis), and the latching claw bends while the clip passes through the hole, and latches after passing. The clip is firmly fixed to the chassis by releasing the elastic deformation of the claw and engaging the locking claw with the rear surface of the chassis.

JP 2010-1928 A (refer to claim 1, paragraphs [0035] to [0042], FIGS. 1 to 3 etc.)

  By the way, for example, if the fixing part is detached from the bottom plate due to vibration or impact during the transportation of the liquid crystal display device, not only the fixing of the mounting board to the bottom plate is insufficient, but the detached fixing part is inside the backlight module. The shadow of the fixed part may be reflected on the display of the liquid crystal panel and deteriorate the display. Therefore, it is desirable that the fixing portion has a configuration that does not easily come off.

  On the other hand, for rework (product regeneration), it is necessary to facilitate removal of the fixing portion to some extent. Although it is easy to simply make it difficult for the fixed part to come off, at present, it is not possible to satisfy both the difficulty of removing the fixed part and the ease of attaching / detaching the fixed part at the same time. Is a trade-off. Therefore, when easiness of rework is pursued, there is a limit in making it difficult to remove the fixed portion. Also, if the individual fixing parts are disjoint, the number of parts required for fixing increases, and forgetting to attach the fixing parts (forgetting to fix by the fixing parts) easily occurs.

  In this regard, in the configuration of Patent Document 1, although the clip can be firmly fixed to the chassis, the trade-off relationship between “the difficulty of removing the clip” and “the ease of attaching and detaching the clip” is broken. They cannot satisfy both at the same time. Further, since the individual clips are disjoint, it is easy to forget to attach the clips.

  The present invention has been made to solve the above-described problems, and its purpose is to provide both “hardness to remove the fixing portion” and “easy to attach / detach the fixing portion” to the bottom plate of the lighting device. Mounting board fixing members that can be satisfied and reduce the number of parts required for fixing a plurality of mounting boards in total, and forgetting to attach fixing parts, and each mounting board by the fixing members It is providing the illuminating device which is fixed to a baseplate, and a liquid crystal display device provided with the illuminating device.

  The mounting substrate fixing member according to the present invention is a mounting substrate fixing member used for fixing a plurality of mounting substrates on which light sources are mounted to a bottom plate of a lighting device, and includes a through hole of each mounting substrate and a through hole of the bottom plate It has a fixing part that is inserted through a hole and fixes the mounting boards to the bottom plate, and a connecting part that connects the fixing parts that fix different mounting boards to each other.

  According to the above configuration, each fixing portion for fixing different mounting substrates is connected by the connecting portion. Therefore, the fixing portion is inserted into the through hole of the mounting substrate and the through hole of the bottom plate, and each mounting substrate is attached to the bottom plate. After fixing, even when a force to be removed from the bottom plate by vibration or the like is applied to an arbitrary fixing portion, the force can be distributed to other fixing portions via the connecting portion. Thereby, even if it does not raise the attachment intensity | strength of each fixing | fixed part with respect to a baseplate, it can make it difficult to remove | eliminate each fixing | fixed part from a baseplate. That is, it is not necessary to increase the mounting strength of each fixing portion in order to make it difficult to remove each fixing portion. This facilitates removal of the fixed portion during reworking, and also facilitates the reverse mounting operation. Therefore, the trade-off relationship between “the difficulty of detachment of the fixing portion” and “easy to attach / detach the fixing portion” with respect to the bottom plate of the lighting device can be eliminated, and both of them can be satisfied.

  In addition, since a plurality of fixing portions connected by the connecting portion can be collectively handled as one component (fixing member), the number of components used when fixing the same number of mounting boards to the bottom plate does not connect the fixing portions. Compared to the case (compared to the case where each fixed part is handled as one component, respectively), the number is significantly reduced. As described above, since the number of components necessary for fixing the mounting substrate can be reduced in total, it is possible to reduce forgetting to attach the fixing portion (forgetting fixing by the fixing portion).

  In the fixing member of the mounting board of the present invention, when n is an integer of 2 or more, the n fixing parts may be connected in a line by the (n−1) connecting parts.

  In this case, each mounting board can be fixed to the bottom plate in line units of the fixing portion, and the fixing operation becomes easy. In addition, the number of parts required for fixing can be reliably reduced, and forgetting to attach the fixing portion can be surely reduced.

  In the mounting substrate fixing member of the present invention, each fixing portion that fixes the different mounting substrate may be connected in parallel by the plurality of connecting portions.

  In this case, the strength of the connecting portion as a whole against an external force (bending or twisting force) can be increased, and damage to the connecting portion due to the external force can be reduced.

  In the mounting substrate fixing member of the present invention, there are a plurality of sets of fixing portions for fixing the different mounting substrates, and in each set, when the connecting portion for connecting the fixing portions is the first connecting portion, You may further have the 2nd connection part which connects the said 1st connection parts of each group.

  In this structure, since the 1st connection parts are connected by the 2nd connection part, a fixing member can be comprised by mesh shape as a whole. Thereby, the fixing operation by the plurality of fixing portions is further facilitated. Further, the number of parts required for fixing can be further reduced, and forgetting to attach the fixing part can be further reduced.

  In the mounting member fixing member according to the present invention, the first connecting portions of each set may be connected in parallel by the plurality of second connecting portions.

  In this case, the strength of the second connecting portion as a whole against external force (bending or twisting force) can be increased, and damage to the second connecting portion due to the external force can be reduced.

  In the mounting substrate fixing member according to the present invention, the fixing portion is provided on a shaft portion inserted into the through hole of the mounting substrate and the through hole of the bottom plate, and the shaft provided on one end side in the axial direction of the shaft portion. An elastic member that is provided on a head having a larger diameter than the portion and on a side surface on the other end side in the axial direction of the shaft portion and engages with a surface of the bottom plate opposite to the mounting side of the mounting substrate. You may have a joint part.

  In this configuration, while the locking portion is elastically deformed, the shaft portion of the fixing portion is inserted into the through hole of the mounting substrate and the through hole of the bottom plate, and the elastic deformation is released to engage the locking portion with the back surface of the mounting substrate. In addition, the mounting substrate can be fixed to the bottom plate by pressing the mounting substrate against the bottom plate with the head of the fixing portion. On the contrary, the fixing by the fixing member can be released by pulling out the shaft portion from the bottom plate while elastically deforming the locking portion. That is, with the configuration of the fixing portion, the mounting board can be securely fixed to and released from the bottom plate.

  In the lighting device of the present invention, a plurality of mounting substrates on which light sources are mounted may be fixed on the bottom plate by the mounting substrate fixing member of the present invention described above.

  According to the structure of the fixing member described above, it is possible to satisfy both “hardness of detachment of the fixing portion” and “easy to attach / detach the fixing portion” with respect to the bottom plate of the lighting device. The work efficiency in the assembly work and rework work of the lighting device can be improved while reducing omission.

  In the illuminating device of the present invention, each of the plurality of mounting substrates is fixed to the bottom plate by a fixing portion of the fixing member at a plurality of locations arranged in a first direction within a plane along the bottom plate, and the fixing member The connecting portions may connect fixing portions corresponding to different mounting boards arranged in a second direction perpendicular to the first direction in a plane along the bottom plate.

  In this case, since the fixing member is formed in a line shape in the second direction as a whole, each mounting board can be fixed together for each line by the fixing member, facilitating the fixing work, and the work time. Shortened.

  In the lighting device of the present invention, a plurality of mounting substrates on which light sources are mounted are fixed on a bottom plate by the above-described mounting substrate fixing member of the present invention, and each of the plurality of mounting substrates extends along the bottom plate. At a plurality of positions aligned in the first direction in the plane, the fixing member is fixed to the bottom plate by the fixing portion, and the first connecting portion of the fixing member is in the first direction in the plane along the bottom plate. Fixing portions corresponding to different mounting boards arranged in the second vertical direction are connected to each other, and the second connecting portion of the fixing member connects the first connecting portions arranged in the first direction to each other. It may be connected.

  According to the structure of the fixing member described above, it is possible to satisfy both “hardness of detachment of the fixing portion” and “easy to attach / detach the fixing portion” with respect to the bottom plate of the lighting device. The work efficiency in the assembly work and rework work of the lighting device can be improved while reducing omission. Moreover, since the 2nd connection part has connected 1st connection parts arranged in a 1st direction, a fixing | fixed part will be located two-dimensionally and each mounting board | substrate will be located by many fixing | fixed parts. Can be fixed together. Therefore, the time required for fixing work can be greatly shortened.

  In the lighting device of the present invention, the second connecting portion of the fixing member may connect the first connecting portions between the mounting substrates adjacent in the second direction.

  In this case, the second connecting portion does not overlap the light source on each mounting substrate and does not hinder the illumination of the light source, so that uneven illumination due to the second connecting portion can be eliminated.

  The illumination device of the present invention may be a direct type in which an illumination target is illuminated from directly below by the light source mounted on each mounting substrate.

  In this case, in the direct type illumination device, the assembly / rework work efficiency can be improved while reducing the dropout of the fixed part due to vibration or the like.

  In the illumination device of the present invention, the light source may be formed of a light emitting diode.

  In this case, in the configuration using the LED as the light source, the assembly / rework work efficiency can be improved while reducing the dropout of the fixed part due to vibration or the like.

  The liquid crystal display device of the present invention may include the above-described illumination device of the present invention and a liquid crystal panel that performs display by modulating light supplied from the illumination device.

  If the individual fixing parts of the fixing member are not connected, if one of the fixing parts is removed, the mounting board cannot be sufficiently fixed to the bottom plate. Deteriorate. Therefore, by illuminating the liquid crystal panel with the lighting device including the fixing member described above, it is possible to avoid the deterioration of the display of the liquid crystal panel due to the dropping of the fixing portion.

  According to the present invention, since the fixing portions corresponding to different mounting boards are connected by the connecting portion, the “difficulty of removing the fixing portion” and the “easy to attach / detach the fixing portion” to the bottom plate of the lighting device. Both can be satisfied. In addition, since a plurality of fixing portions connected by the connecting portion can be collectively handled as one component, the number of components required for fixing the mounting substrate can be reduced in total, and forgetting to attach the fixing portion can be reduced. .

It is sectional drawing which shows the schematic structure of the liquid crystal display device of Embodiment 1 of this invention. (A) is a top view of the backlight of the said liquid crystal display device, (b) is an A-A 'arrow sectional drawing in Fig.2 (a). It is sectional drawing which compares and shows the fixing member applied to the backlight of a reference example, and the fixing member applied to the backlight of Embodiment 1. 3 is an enlarged perspective view showing a part of the fixing member according to Embodiment 1. FIG. It is a perspective view which expands and shows a part of fixing member of Embodiment 2 of this invention. It is a top view of the backlight of Embodiment 3 of this invention. 10 is an enlarged perspective view showing a part of a fixing member according to Embodiment 3. FIG. It is a perspective view which expands and shows a part of fixing member of Embodiment 4 of this invention. It is a perspective view which expands and shows the other structure of the said fixing member. (A) is a top view which shows the schematic structure of the backlight of a reference example, (b) is A-A 'arrow sectional drawing in Fig.10 (a).

[Embodiment 1]
First, before describing the configuration of the liquid crystal display device 1 of the present embodiment, the configuration of the illumination device that is the premise of the present embodiment will be described as a reference example.

  FIG. 10A is a plan view showing a schematic configuration of a backlight 3 as a lighting device of a reference example, and FIG. 10B is a cross-sectional view taken along line AA ′ in FIG. It is. In this backlight 3, an LED substrate 13 on which LEDs 12 as a plurality of light sources are mounted is fixed to the bottom plate 11a by a fixing member 20 '. The fixing member 20 ′ is composed only of a fixing portion 21 made of a plastic fixing rivet.

The method of fixing the LED substrate 13 by the fixing unit 21 is as follows. First, inserting the shaft portion 21a of the fixed portion 21 into the through-holes 11a ₁ of the through hole 13a and the bottom plate 11a of the LED substrate 13. At this time, the engaging portion 21c provided on the tip side surface of the shaft portion 21a passes through the through hole 13a and the through hole 11a ₁ while being elastically deformed. Then, the engaging section 21c, passes through the through hole 11a ₁ is released elastically deformed returns to its original shape, caught by the (surface opposite to the mounting side of the LED substrate 13) the rear surface of the bottom plate 11a. At the same time, the head 21b of the fixing portion 21 presses the LED board 13 against the bottom plate 11a. In this way, the LED substrate 13 is fixed to the bottom plate 11a.

  In this configuration, since each fixing portion 21 is independent and disjoint, as described above, “the difficulty of detaching the fixing portion 21” and “easy to attach and detach the fixing portion 21” with respect to the bottom plate 11a. Cannot be satisfied at the same time, and forgetting to attach the fixing portion 21 (forgetting fixing by the fixing portion 21) is likely to occur.

  Therefore, in the present embodiment, the above-described problems are addressed by connecting the fixing portions 21 to form a connecting rivet. Hereinafter, the configuration of the present embodiment will be described.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a liquid crystal display device 1 of the present embodiment. FIG. 2A is a plan view of the backlight 3 of the liquid crystal display device 1, and FIG. 2B is a cross-sectional view taken along the line A-A 'in FIG. In FIG. 2A, for the sake of convenience, illustration of a diffusing plate 14, an optical sheet 15, and a reflecting sheet 16, which will be described later, is omitted. As shown in these drawings, the liquid crystal display device 1 includes a liquid crystal panel 2 and a backlight 3.

  The liquid crystal panel 2 is a liquid crystal display element that displays light by modulating light supplied from the backlight 3, and is configured by sandwiching a liquid crystal layer between a pair of substrates. On one substrate, a source wiring and a gate wiring arranged so as to be orthogonal to each other, and a switching element (for example, TFT: Thin Film Transistor) for turning on / off driving of a pixel surrounded by the adjacent source wiring and gate wiring And pixel electrodes connected to the switching elements. The other substrate is provided with a color filter including R (red), G (green), and B (blue) color filters provided corresponding to each pixel, a common electrode common to each pixel, and the like. . In addition, an alignment film for aligning liquid crystal molecules is provided on the liquid crystal layer side of each substrate, and a polarizing plate that transmits only predetermined polarized light is provided on the outer side (the side opposite to the liquid crystal layer) of each substrate. Is provided.

  The backlight 3 is a direct-type surface light source device (illumination device) that is disposed directly below the back surface of the liquid crystal panel 2 and illuminates the liquid crystal panel 2 in a planar shape. The backlight 3 includes a backlight chassis 11, an LED 12 as a light source, an LED substrate 13, a diffusion plate 14, an optical sheet 15, a reflection sheet 16, a fixing member 20 (connection rivet), and a circuit (not shown). And a substrate. Details of the fixing member 20 will be described later. The circuit board described above is a circuit board for controlling the light emission of the LED 12, but may include a circuit board for driving the liquid crystal panel 2 and other boards (power supply board, control board). In addition, you may make it provide the diffusion lens which diffuses the light radiate | emitted from LED12 on the LED board 13 corresponding to each of LED12.

The backlight chassis 11 is a chassis member formed by bending one sheet metal into a predetermined shape, and includes a bottom plate 11a and a side plate 11b. The bottom plate 11a is formed in a rectangular shape in plan view, and a plurality of LEDs 12 are mounted on one surface (surface on the liquid crystal panel 2 side) via the LED substrate 13. The bottom plate 11a is provided with a through hole 11a ₁ (see FIG. 2B) into which a shaft portion 21a of the fixing portion 21 described later is inserted. The side plate 11b is connected to the outer peripheral portion (four side portions of the bottom plate 11a) of the bottom plate 11a so as to rise substantially perpendicular to the bottom plate 11a.

  Here, two directions perpendicular to each other in the plane along the bottom plate 11a are defined as an H direction and a V direction, respectively. The H direction corresponds to the longitudinal direction of the rectangular bottom plate 11a in plan view, and the V direction corresponds to the short direction of the bottom plate 11a.

  The LED 12 is composed of a light emitting diode as a point light source, and a plurality of LEDs 12 are mounted in the H direction on an LED substrate 13 as a mounting substrate. A plurality of LED substrates 13 are provided in parallel in the V direction on the bottom plate 11a. Thereby, the plurality of LEDs 12 are two-dimensionally arranged on the bottom plate 11a. Note that a plurality of LED substrates 13 may be provided in parallel in the H direction.

Each LED substrate 13 is fixed to the bottom plate 11a by a fixing portion 21 (illustrated by white circles in FIG. 2A) at a plurality of locations arranged in the H direction. For this reason, each LED board 13 is provided with a through hole 13a (see FIG. 2B) into which the shaft portion 21a of the fixing portion 21 is inserted so as to be alternately positioned in the H direction with the LED 12. In one LED substrate 13, two or more LEDs 12 may be positioned between the adjacent through holes 13a and 13a. The size and arrangement pitch of the through holes 13a is consistent with the size and arrangement pitch of the through holes 11a ₁ of the bottom plate 11a.

  The diffusion plate 14 diffuses the light emitted from each LED 12 and makes it uniform, and is formed in a flat plate shape. The optical sheet 15 emits light that has passed through the diffusion plate 14 as planar light, and includes a lens sheet, a prism sheet, a retroreflective sheet, and the like. Each end of the diffusion plate 14 and the optical sheet 15 is supported by the side plate 11 b of the backlight chassis 11 via the end of the reflection sheet 16.

  The reflection sheet 16 has an opening 16a through which each LED 12 is exposed, and is disposed on the bottom plate 11a so as to cover the LED substrate 13, and is emitted from the LED 12 and directly incident thereon, and is emitted from the LED 12. The light that is reflected by the diffuser plate 14 and the like is incident again on the liquid crystal panel 2 side. Thereby, the utilization efficiency of the light radiate | emitted from LED12 can be improved.

  The reflection sheet 16 has an edge portion 16 b that rises obliquely with respect to the bottom plate 11 a outside the arrangement region of the LED substrate 13. An end portion (outer peripheral portion) of the edge portion 16 b is supported from below by the side plate 11 b of the backlight chassis 11.

  By providing the reflection sheet 16, the periphery of the screen of the liquid crystal panel 2 is illuminated by the light emitted from the LED 12 and reflected by the edge 16 b of the reflection sheet 16 without arranging the LEDs 12 around the bottom plate 11 a. be able to. Therefore, since it is not necessary to arrange the LEDs 12 around the bottom plate 11a, the number of LEDs 12 can be reduced and the cost can be reduced.

  Next, details of the above-described fixing member 20 will be described. As shown in FIGS. 2A and 2B, the fixing member 20 is used to fix the plurality of LED boards 13 to the bottom plate 11a, and includes a fixing part 21 and a connecting part 22 (first connecting part). Part). The fixing portion 21 and the connecting portion 22 may be formed of an integrally molded product of resin, or may be formed by bonding different members.

Fixing unit 21, which is inserted into the through hole 11a ₁ of the through hole 13a and the bottom plate 11a of each LED board 13 to fix the LED substrate 13 to the bottom plate 11a, and is composed of, for example, plastic rivets. The fixed part 21 has a shaft part 21a, a head part 21b, and an engaging part 21c. In the present embodiment, the fixing portion 21 is formed by integral molding of the above members, but may be configured by bonding individual members.

Shaft portion 21a, when fixing the LED substrate 13 to the bottom plate 11a, a portion inserted into the through holes 11a ₁ of the through hole 13a and the bottom plate 11a of the LED substrate 13. The head portion 21b has a larger diameter than the shaft portion 21a, and is provided on one end side in the axial direction of the shaft portion 21a. The LED board 13 can be pressed against the bottom plate 11a by the head 21b. The engaging portion 21c is provided on the side surface of the shaft portion 21a on the other end side in the axial direction (the side opposite to the head portion 21b) and engages with the surface of the bottom plate 11a opposite to the mounting side of the LED substrate 13. It is elastic and has elasticity.

  The connection part 22 connects each fixing part 21 which fixes different LED board 13 mutually, for example, connects the head parts 21b of the fixing part 21. The connecting portion 22 is formed of the same resin material as that of the fixing portion 21, but may be formed of a different material and connect the fixing portions 21 to each other by adhesion using an adhesive or the like.

  Here, assuming that each LED board 13 has the same configuration, if the LED board 13 in which a plurality of LEDs 12 are arranged in the H direction is arranged in the V direction on the bottom plate 11a, the LED board 13 is formed on each LED board 13. The through holes 13a are also arranged along the V direction. Therefore, in the backlight 3, the connecting portion 22 connects the fixing portions 21 corresponding to the LED boards 13 arranged in the V direction to each other in the V direction. As a result, the fixing member 20 is formed in a line shape in the V direction as a whole.

  The length in the V direction of the connecting portion 22 that connects the two fixing portions 21 to each other is set according to the arrangement interval of the adjacent LED boards 13 and the size of the fixing portion 21 (particularly, the diameter of the head portion 21b). . In FIG. 2A, four fixing portions 21 arranged in the V direction are connected by three connecting portions 22 to constitute one fixing member 20, but when n is an integer of 2 or more, One fixing member 20 can be configured by connecting n fixing portions 21 in a line shape with (n-1) connecting portions 22.

  FIG. 3 is a cross-sectional view showing a comparison between the fixing member 20 ′ of the reference example shown above and the fixing member 20 of the present embodiment. As shown in the figure, the fixing member 20 of the present embodiment is different from the fixing member 20 ′ of the reference example in that individual fixing portions 21 are connected by connecting portions 22.

  FIG. 4 is an enlarged perspective view showing a part of the fixing member 20 of the present embodiment. The connecting portion 22 is desirably made as thin (thin) as possible to suppress illumination unevenness (brightness unevenness) of the backlight 3 and to reduce costs. However, if the connecting portion 22 is too thin, there is a concern that the strength of the connecting portion 22 may be reduced. Is done. For this reason, the connection part 22 should just be formed by the thinness (thinness) which can ensure the intensity | strength (determined by a constituent material) of the connection part 22 required.

The fixing of the LED substrate 13 to the bottom plate 11a by the fixing member 20 is performed as follows. In FIG. 2 (a) (b), inserting the shaft portion 21a of the fixing portion 21 from the engagement portion 21c side into the through hole 11a ₁ of the through hole 13a and the bottom plate 11a of the LED substrate 13. At this time, the locking portion 21c passes through the through hole 13a and the through hole 11a ₁ while being elastically deformed. Then, the engaging section 21c, passes through the through hole 11a ₁ is released elastically deformed returns to its original shape, caught by the back surface of the bottom plate 11a. At the same time, the head 21b of the fixing portion 21 presses the LED board 13 against the bottom plate 11a. In this way, the LED substrate 13 is fixed to the bottom plate 11a.

On the other hand, when releasing the fixing by the fixing member 20, such as during rework, the fixing portion 21 (shaft portion 21a) is pulled out from the through hole 13a and the through hole 11a ₁ one by one while elastically deforming the locking portion 21c. With this, it can be released. As described above, the fixing portion 21 of the fixing member 20 is configured to include the shaft portion 21a, the head portion 21b, and the locking portion 21c described above, so that the LED substrate 13 can be securely fixed to and released from the bottom plate 11a. Can be done.

  Like this embodiment, the connection part 22 of the fixing member 20 has connected each fixing part 21 which fixes different LED board 13 mutually, and fixed each LED board 13 to the baseplate 11a by the fixing part 21. FIG. After that, even when a force for removing from the bottom plate 11a is applied to the fixing portion 21 of the arbitrary LED substrate 13 due to vibration or impact during the transportation of the liquid crystal display device 1, the force is applied to the other portion via the connecting portion 22. It can be dispersed in the fixing portion 21 of the LED substrate 13. That is, the force applied to each fixing portion 21 due to the vibrations described above varies in the direction and magnitude of the force, but by connecting the plurality of fixing portions 21 by the connecting portions 22, the force is applied to each fixing portion 21. The applied force can be dispersed and reduced.

  Thereby, even if it does not raise the attachment strength of each fixing | fixed part 21 with respect to the baseplate 11a (For example, even if it reduces the elastic force of the latching | locking part 21c and does not make it difficult to remove | deviate from the baseplate 11a), each fixing | fixed part 21 from the baseplate 11a It can be made difficult to come off. In other words, it is not necessary to increase the attachment strength of each fixing part 21 (to reduce the elastic force of the locking part 21c and to make it harder) in order to make it difficult to remove each fixing part 21 from the bottom plate 11a.

  Further, if the fixing strength of each fixing portion 21 is not high (if the locking portion 21c is not hard), the fixing portions 21 can be easily removed during rework, and the reverse mounting operation is also easy. Therefore, the trade-off relationship between “the difficulty of detachment of the fixing portion 21” and “easy to attach / detach the fixing portion 21” with respect to the bottom plate 11a is eliminated, and both of them can be satisfied. Therefore, the work efficiency in the assembly work and rework work of the backlight 3 can be improved while reducing the dropout of the fixing portion 21 due to vibration or the like.

  In addition, since the plurality of fixing portions 21 connected by the connecting portion 22 can be collectively handled as one component (fixing member 20), the number of components used when fixing the same number of LED boards 13 to the bottom plate 11a is as follows. Compared to the case where the fixed portions 21 are not connected (compared to the case where each fixed portion 21 is handled as one component, respectively), the number is significantly reduced.

  For example, in the configuration of the reference example shown in FIGS. 10A and 10B, the number of parts required for fixing is the number of fixing portions 21 itself (6 × 4 = 24). , (The number of all fixed parts 21) / (the number of fixed parts 21 connected by one fixing member 20), and when n fixed parts 21 are connected, the total number of parts required for fixing Can be reduced to 1 / n of the number of all the fixed portions 21. Thus, since the number of parts required for fixing the LED substrate 13 can be reduced in total, it is possible to reduce forgetting to attach the fixing portion 21 (forgetting to fix by the fixing portion 21).

  Also, by applying a force in the same direction to the connected fixed portions 21 together, these fixed portions 21 can be collectively inserted into the through holes 13a, and the LED boards 13 can be fixed to the bottom plate 11a. . Therefore, the fixing work by the fixing member 20 becomes easy. Furthermore, when releasing the fixing, if one fixing portion 21 is removed, the other fixing portions 21 can be removed so that they can be dragged, and the operation of removing the fixing portion 21 can be easily performed. Also from such a point, the work efficiency of assembly / rework of the backlight 3 can be improved.

  Moreover, since each fixing | fixed part 21 is connected via the connection part 22, if the insertion position (position of the through-hole 13a) of the fixing | fixed part 21 is decided, the insertion position of the remaining fixing | fixed part 21 will also be decided naturally, This saves you the trouble of searching for each insertion position. Thereby, forgetting to attach the fixing | fixed part 21 can further be reduced, and the time which fixing work as a whole can be shortened.

  Moreover, in this embodiment, since the n fixing | fixed part 21 is connected with the line form by the (n-1) connecting part 22, each LED board 13 is attached to the baseplate 11a in the line unit of the fixing | fixed part 21. Can be easily fixed. In addition, as described above, since the number of parts required for fixing is reliably reduced as compared with the configuration of the reference example, forgetting to attach the fixing portion 21 can be surely reduced.

  In addition, the backlight 3 of the present embodiment is a direct type in which the LED 12 mounted on each LED substrate 13 illuminates the liquid crystal panel 2 to be illuminated from directly below. Thus, by applying the fixing member 20 having the above-described configuration to the backlight 3 that uses the LED 12 as a light source in a direct type, in such a backlight 3, while dropping of the fixing portion 21 due to vibration or the like is reduced, Assembling / reworking work efficiency can be improved.

  Further, in the configuration of the reference example in which the individual fixing portions 21 are not connected, if any of the fixing portions 21 is detached, the LED substrate 13 cannot be sufficiently fixed to the bottom plate 11a. It enters the inside of the module and degrades the display of the liquid crystal panel 2. However, in the present embodiment, the individual fixing portions 21 are connected by the connecting portions 22, and the force applied to each fixing portion 21 is dispersed by vibrations or the like so that it is difficult to come off from the bottom plate 11a. 2 can be avoided.

[Embodiment 2]
FIG. 5 is an enlarged perspective view showing a part of the fixing member 20 of the present embodiment. As shown in the figure, each fixing portion 21 that fixes different LED boards 13 is connected in parallel by a plurality of connecting portions 22. In the figure, the two fixing portions 21 are connected in parallel by the two connecting portions 22, but may be connected in parallel by three or more connecting portions 22.

  In this way, by connecting the two fixing portions 21 at a plurality of locations by the plurality of connecting portions 22, compared to the configuration in which the two fixing portions 21 are connected by the single connecting portion 22, an external force (bending or twisting) can be achieved. The strength of the entire connecting portion 22 with respect to (force) can be increased. Thereby, the damage of the connection part 22 by external force can be reduced.

[Embodiment 3]
FIG. 6 is a plan view of the backlight 3 of the present embodiment. In FIG. 6, illustration of the diffusion plate 14, the optical sheet 15, and the reflection sheet 16 is omitted for convenience. In the present embodiment, the fixing member 20 of the backlight 3 further includes a connecting portion 23 (second connecting portion) in addition to the configuration of the first or second embodiment.

  The connection part 23 connects the connection parts 22 adjacent in the H direction between the LED boards 13 adjacent in the V direction. That is, there are a plurality of sets of fixing portions 21 for fixing different LED substrates 13 (for example, in FIG. 6, there are six sets of fixing portions 21 and 21 for fixing two LED substrates 13 in the H direction). When the connecting part 22 connects the fixed parts 21, the connecting part 23 connects the connecting parts 22 of each set. The connecting portion 23 is formed of the same resin material as the fixing portion 21 and the connecting portion 22, but may be formed of a different material and connect adjacent connecting portions 22 to each other by adhesion using an adhesive or the like. In the present embodiment, all the connecting portions 22 arranged in the H direction are connected by the connecting portions 23, but it is sufficient that at least two connecting portions 22 are connected by the connecting portions 23.

  FIG. 7 is an enlarged perspective view showing a part of the fixing member 20 of the present embodiment. The connecting portion 23 is desirably made as thin (thin) as possible to suppress illumination unevenness (brightness unevenness) of the backlight 3 and to reduce costs. However, if the connecting portion 23 is too thin, there is a concern that the strength of the connecting portion 23 may be reduced. Is done. For this reason, the connection part 23 should just be formed with the thinness (thinness) which can ensure the intensity | strength (determined by a constituent material) of the connection part 23 required.

  Thus, by connecting the connection parts 22 by the connection part 23, as shown in FIG. 6, the fixing member 20 as a whole can be comprised by mesh shape by planar view. In this case, the fixing portion 21 is two-dimensionally positioned via the connecting portion 22 and the connecting portion 23, and the fixing portions 21 are put together by applying a force in the same direction to the fixing portions 21 together. Thus, the LED boards 13 can be collectively fixed to the bottom plate 11a by being inserted into the through holes 13a. Therefore, the fixing work by the fixing member 20 is further facilitated, and the time required for the fixing work can be greatly shortened.

  Further, the number of parts required for fixing is further reduced as compared with the configurations of the first and second embodiments. That is, if all the fixing parts 21 are connected via the connecting part 22 and the connecting part 23 as in the present embodiment, the total number of parts required for fixing can be reduced to one. Therefore, forgetting to attach the fixing portion 21 can be further reduced.

  Moreover, since the connection part 23 has connected the connection parts 22 between the LED boards 13 adjacent in a V direction, the connection part 23 does not overlap with LED12 on each LED board 13. FIG. Therefore, it can reduce that the connection part 23 obstructs illumination of LED12, and an illumination nonuniformity arises, and can suppress that the display quality of the liquid crystal panel 2 falls by this.

[Embodiment 4]
FIG. 8 is an enlarged perspective view showing a part of the fixing member 20 of the present embodiment. As shown in the figure, the connecting portion 23 of the fixing member 20 connects two adjacent connecting portions 22 at a plurality of locations. That is, each set of connecting portions 22 shown in Embodiment 3 is connected in parallel by a plurality of connecting portions 23. In addition, in the same figure, although the two connection parts 22 are connected in parallel by the two connection parts 22, you may connect in parallel by the 3 or more connection parts 23. FIG.

  As described above, since the connecting portion 23 connects the two connecting portions 22 at a plurality of locations, an external force (bending or twisting) can be achieved as compared with the configuration in which the two connecting portions 22 are connected by one connecting portion 23. The strength of the entire connecting portion 23 with respect to (force) can be increased. Thereby, the damage of the connection part 23 by external force can be reduced.

  Of course, the fixing member 20, the backlight 3, and thus the liquid crystal display device 1 can be configured by appropriately combining the configurations of the respective embodiments.

  For example, FIG. 9 is an enlarged perspective view showing another configuration of the fixing member 20. As shown in the figure, the fixing member 20 may be configured by combining the second and fourth embodiments. That is, in the configuration in which the two fixing portions 21 are connected in parallel by the plurality of connecting portions 22, the fixing member 20 may be configured by connecting each of the sets of connecting portions 22 in parallel by the plurality of connecting portions 23. Good. In this case, the strength of the connecting portion 23 can be further increased compared to the configuration of FIG.

  The illumination device of the present invention can be used as a backlight for illuminating a liquid crystal panel of a liquid crystal display device, for example.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal panel 3 Backlight (illumination device)
11a Bottom plate 11a ₁ Through hole 12 LED (light source, light emitting diode)
13 LED board (mounting board)
13a Through hole 20 Fixing member 21 Fixing part 21a Shaft part 21b Head part 21c Locking part 22 Connection part (1st connection part)
23 connecting part (second connecting part)

Claims (12)

A mounting board fixing member used for fixing a plurality of mounting boards mounted with a light source to a bottom plate of a lighting device,
A fixing portion that is inserted through the through hole of each mounting substrate and the through hole of the bottom plate and fixes each mounting substrate to the bottom plate;
It has a connecting part that connects each fixing part that fixes different mounting boards to each other ,
When there are a plurality of sets of fixing parts for fixing the different mounting substrates, and in each set, the connecting part for connecting the fixing parts is a first connecting part,
A mounting board fixing member, further comprising a second connecting portion for connecting the first connecting portions of each set. 2. The mounting board fixing member according to claim 1, wherein the first connection portions of each set are connected in parallel by the plurality of second connection portions. A mounting board fixing member used for fixing a plurality of mounting boards mounted with a light source to a bottom plate of a lighting device,
A fixing portion that is inserted through the through hole of each mounting substrate and the through hole of the bottom plate and fixes each mounting substrate to the bottom plate;
It has a connecting part that connects each fixing part that fixes different mounting boards to each other,
The fixing part is
A shaft portion inserted into the through hole of the mounting substrate and the through hole of the bottom plate;
A head having a diameter larger than that of the shaft portion, provided on one axial end side of the shaft portion;
An engaging portion having elasticity that is provided on a side surface on the other axial end side of the shaft portion and engages with a surface of the bottom plate opposite to the mounting side of the mounting substrate. A mounting substrate fixing member. When n is an integer of 2 or more,
4. The mounting member fixing member according to claim 1, wherein the n fixing parts are connected in a line by the (n-1) connecting parts. 5. The mounting board fixing member according to claim 1, wherein the fixing parts for fixing the different mounting boards are connected in parallel by the plurality of connecting parts. 6. 6. A lighting device comprising: a plurality of mounting boards on which a light source is mounted fixed on a bottom plate by the mounting board fixing member according to claim 1. Each of the plurality of mounting substrates is fixed to the bottom plate by a fixing portion of the fixing member at a plurality of locations arranged in a first direction within a plane along the bottom plate,
  The connecting portion of the fixing member connects the fixing portions corresponding to different mounting boards arranged in a second direction perpendicular to the first direction within a plane along the bottom plate. The lighting device according to claim 6. A plurality of mounting boards on which light sources are mounted are fixed on the bottom plate by the mounting board fixing member according to claim 1 or 2,
Each of the plurality of mounting substrates is fixed to the bottom plate by a fixing portion of the fixing member at a plurality of locations arranged in a first direction within a plane along the bottom plate,
The first connecting portion of the fixing member connects the fixing portions corresponding to different mounting boards arranged in a second direction perpendicular to the first direction in a plane along the bottom plate,
The second connecting portion of the fixing member connects the first connecting portions arranged in the first direction to each other. The lighting device according to claim 8, wherein the second connecting portion of the fixing member connects the first connecting portions between the mounting boards adjacent in the second direction. . The illumination device according to any one of claims 6 to 9, wherein the illumination device is a direct type that illuminates an illumination target from directly below with the light source mounted on each mounting substrate. The lighting device according to claim 6, wherein the light source is formed of a light emitting diode. A lighting device according to any one of claims 6 to 11,
A liquid crystal display device comprising: a liquid crystal panel that performs display by modulating light supplied from the illumination device.

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