JP2012043613A - Lighting system, display device, and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of carrying out easily installation work of a board cover.SOLUTION: The lighting system is provided with a cold-cathode tube 17, a chassis 14 in which the cold-cathode tube 17 is housed, a control board 40 which is installed in the chassis 14, a board cover 60 which is installed in the chassis 14 and arranged so as to cover the control board 40, and a nut member 80 which locks the board cover 60 to the chassis 14. A bolt member 70 which protrudes toward the board cover 60 is installed at the installation part of the board cover 60 in the chassis 14, and a cover-side through hole 65 into which the bolt member 70 is inserted is formed in the board cover 60, and the nut member 80 is installed on the bolt member 70 so that the board cover 60 in the state in which the bolt member 70 is inserted into the cover-side through hole 65 may be locked with the chassis 14 in the state of pinching it between the chassis 14.

Description

  The present invention relates to a lighting device, a display device, and a television receiver.

  Conventionally, a liquid crystal panel used for a liquid crystal display device such as a liquid crystal television does not emit light, and thus has a backlight device as a separate illumination device. This backlight device is well known to be installed on the back side of the liquid crystal panel (opposite to the display surface). The backlight device is installed on the inner surface of the bottom plate of the chassis and the chassis having a shape opened on the liquid crystal panel side. A plurality of light sources (for example, cold-cathode tubes and LEDs), an optical member (such as a diffusion plate) that is disposed in the opening of the chassis and efficiently emits light emitted from the light sources to the liquid crystal panel side, And a light reflecting sheet that reflects light from the light source toward the optical member and the liquid crystal panel.

  In addition, a circuit board for driving a liquid crystal display device is attached to the chassis, and a chassis is known in which a board cover is attached to cover the circuit board. Such a board cover and a circuit board are attached to the chassis by attachment means such as screws. In addition, what was described in following patent document 1 is known as an example of the liquid crystal display device of the structure which fixes a circuit board with a screw | thread with respect to a chassis.

Japanese Patent Laid-Open No. 2007-180751

  When attaching the board cover as described above to the chassis, it is necessary to hold the board cover at a predetermined attachment position. Conventionally, such a substrate cover holding operation has been performed manually by an operator, and there is room for improvement in workability.

  The present invention has been completed based on the above circumstances, and an object of the present invention is to provide an illuminating device capable of easily performing a mounting operation of a substrate cover. Moreover, it aims at providing the display apparatus provided with such an illuminating device, and a television receiver.

  In order to solve the above problems, an illumination device according to the present invention is arranged in such a manner that a light source, a chassis that houses the light source, a circuit board that is attached to the chassis, and a circuit board that is attached to the chassis and covers the circuit board. A board cover, and a locking part for locking the board cover with respect to the chassis, and a protrusion protruding toward the board cover at a mounting position of the board cover in the chassis. The board cover is formed with an insertion hole through which the protrusion is inserted, and the locking part is configured to connect the board cover in a state where the protrusion is inserted into the insertion hole to the chassis. It is characterized in that it is attached to the protrusion so as to be able to be locked to the chassis in a form sandwiched between and.

  In this invention, a board | substrate cover can be hold | maintained with respect to a chassis by inserting a protrusion into an insertion hole. Thereby, after inserting a protrusion into an insertion hole, it is not necessary to hold | maintain a board | substrate cover with a hand etc., and workability | operativity can be improved. And the latching | locking part is attached to the protrusion so that the board | substrate cover in the state by which the protrusion was penetrated to the penetration hole can be latched to the said chassis in the form pinched | interposed with a chassis. For this reason, the situation where a substrate cover removes from a projection can be controlled, and a substrate cover can be fixed certainly.

  The said structure WHEREIN: The said protrusion is a bolt member, Comprising: The said latching | locking part shall be a nut member screwed together with the said bolt member.

  If a bolt member and a nut member are used, a protrusion and a latching | locking part can be comprised with a comparatively simple structure.

  Moreover, the said nut member and the said bolt member shall be screwed together through the multi-thread screw.

  If it is the structure screwed by a multi-thread screw, compared with the structure using a single thread screw, the work speed at the time of screwing a nut member to a bolt member can be improved, and workability is good. Become.

  Further, the locking part has a locking part side insertion hole through which the protrusion can be inserted, and the locking part is inserted into the locking part side insertion hole so that the locking part is the protrusion. A plurality of protrusions that are in contact with the protrusions may be formed on the inner peripheral surface of the engaging part side insertion hole.

  Since the plurality of protrusions abut on the protrusions, it is possible to more reliably suppress the situation in which the locking portions drop off from the protrusions, and it is possible to more reliably fix the substrate cover.

  The locking portion is a cap member that is attached to the protrusion so as to cover a tip of the protrusion, and the cap member includes a flange portion that sandwiches the substrate cover with the chassis. Can be formed.

  By covering the tip of the protrusion with the cap member, safety can be further increased.

  Moreover, the said latching | locking part shall be a snap ring extrapolated by the said protrusion. The substrate cover can be fixed simply by extrapolating the snap ring to the protrusion, and workability can be improved.

  The locking portion is made of a shape memory alloy, and is locked to the chassis at a predetermined temperature in such a manner that the substrate cover in a state where the protrusion is inserted into the insertion hole is sandwiched between the chassis and the chassis. It can be set as the structure which returns to the shape to do.

  By setting the locking portion to a predetermined temperature, it can be returned to the shape locked to the chassis while being sandwiched between the chassis. With such a configuration, it is possible to easily perform the operation of locking the locking portion to the substrate cover, which is preferable. In addition, in the case of a configuration in which a plurality of protrusions and locking portions are formed, it is possible to return to a shape in which the plurality of locking portions are collectively locked to the substrate cover due to a temperature change. Workability can be greatly improved.

  The locking portion is formed at the tip of the protrusion and has a cylindrical shape having a diameter larger than the hole diameter of the insertion hole, and a locking portion side groove is formed at the tip of the locking portion. By being formed, the locking portion can be configured to be elastically deformable into a shape having a diameter smaller than the diameter of the insertion hole.

  The locking portion and the protrusion are inserted into the insertion hole in a state where the locking portion is deformed to a diameter smaller than the diameter of the insertion hole. In a state where the locking portion passes through the insertion hole and the protrusion is inserted into the insertion hole, the locking portion is elastically restored and has a diameter larger than the diameter of the insertion hole. Thereby, the latching | locking part can be latched to the said chassis in the form which pinches | interposes a board | substrate cover between chassis.

  The locking portion may be formed by caulking the tip of the protrusion.

  If the locking part is formed by caulking the tip of the protrusion, the board cover can be locked more firmly to the chassis.

  Next, in order to solve the above-described problem, a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.

  The display panel can be exemplified by a liquid crystal panel. Such a display device can be applied as a liquid crystal display device to various uses, for example, a desktop screen of a television or a personal computer, and is particularly suitable for a large screen.

  Next, in order to solve the above problems, a television receiver of the present invention includes the display device.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the illuminating device which can perform the attachment operation | work of a board | substrate cover easily, the display apparatus provided with such an illuminating device, and a television receiver.

The disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 1 of this invention. The disassembled perspective view which shows schematic structure of the liquid crystal display device with which the television receiver of FIG. 1 is provided. Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device. The top view which shows the back surface of the backlight apparatus with which the liquid crystal display device of FIG. 2 is provided. The enlarged view which shows the state which attached the board | substrate cover in FIG. Sectional drawing which shows the attachment structure of a board | substrate cover and a control board (The figure cut | disconnected by the AA line of FIG. 5). Sectional drawing which shows the attachment structure of the board | substrate cover which concerns on Embodiment 2 of this invention, and a control board. Sectional drawing which shows the attachment structure of the board | substrate cover which concerns on Embodiment 3 of this invention, and a control board. The top view which shows the attachment structure of the board | substrate cover of FIG. 8, and a control board. Sectional drawing which shows the attachment structure of the board | substrate cover which concerns on Embodiment 4 of this invention, and a control board. Sectional drawing which shows the attachment structure of the board | substrate cover which concerns on Embodiment 5 of this invention, and a control board. The top view which shows the attachment structure of the board | substrate cover of FIG. 11, and a control board. Sectional drawing which shows the attachment structure of the board | substrate cover which concerns on Embodiment 6 of this invention, and a control board. Sectional drawing which shows the state which the latching | locking part returned in shape in FIG. Sectional drawing which shows the attachment structure of the board | substrate cover which concerns on Embodiment 7 of this invention, and a control board. The top view which shows the attachment structure of the board | substrate cover of FIG. 15, and a control board. Sectional drawing which shows the attachment structure of the board | substrate cover which concerns on Embodiment 8 of this invention, and a control board.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. First, the configuration of the television receiver TV including the liquid crystal display device 10 will be described. 1 is an exploded perspective view showing a schematic configuration of the television receiver of the present embodiment, FIG. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver of FIG. 1, and FIG. 3 is a liquid crystal display of FIG. It is sectional drawing which shows the cross-sectional structure along the long side direction of an apparatus. The long side direction of the liquid crystal display device 10 (and the chassis 14) is the X-axis direction, and the short side direction is the Y-axis direction. Also, the vertical direction in FIG. 3 is the Z-axis direction (front and back direction), the upper direction in FIG. 3 is the front side, and the lower direction is the back side.

  As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power supply substrate P, and a tuner T. And a stand S. The liquid crystal display device 10 (display device) has a horizontally long rectangular shape as a whole, and is accommodated in a vertically placed state (a state in which the short side direction is arranged along the vertical direction). As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 (display panel) and a backlight device 12 (illumination device) as an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.

  Next, the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described. The liquid crystal panel 11 is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. Note that polarizing plates 11a and 11b are attached to the outside of both substrates (see FIG. 3).

  As shown in FIG. 2, the backlight device 12 is attached so as to cover a substantially box-shaped chassis 14 having an opening 14 b on the light emitting surface side (liquid crystal panel 11 side), and the opening 14 b of the chassis 14. Diffusion plate 15a, a plurality of optical sheets 15b arranged between the diffusion plate 15a and the liquid crystal panel 11, and a long side edge of the diffusion plate 15a arranged along the long side of the chassis 14 with the chassis 14 And a frame 16 that is held between them.

  Further, in the chassis 14, a cold cathode tube 17 (light source), a lamp clip 18 for attaching the cold cathode tube 17 to the chassis 14, and a relay for relaying electrical connection at each end of the cold cathode tube 17. A connector 19 and a holder 20 that collectively covers the end of the cold cathode tube 17 group and the relay connector 19 group are accommodated. In the backlight device 12, the diffusion plate 15 a side is a light emission side from the cold cathode tube 17.

  The chassis 14 is made of a metal plate-like member formed by sheet metal, and has a rectangular flat plate-like bottom plate 14a and an outer edge portion 21 (short side in the short side direction) that rises from each side and is folded back into a substantially U shape. It has a substantially box shape including an outer edge portion 21a and a long side outer edge portion 21b) in the long side direction. In the bottom plate 14a of the chassis 14, a plurality of attachment holes 22 for attaching the relay connector 19 are formed through both ends of the long side direction. Furthermore, a fixing hole (not shown) is formed through the upper surface of the long-side outer edge portion 21b of the chassis 14 so that the bezel 13, the frame 16, the chassis 14 and the like can be integrated with, for example, screws. It is said that. The material of the chassis 14 is not limited to metal and can be changed as appropriate.

  As shown in FIGS. 2 and 6, a light reflecting sheet 23 is disposed on the inner surface side (the surface side facing the cold cathode tube 17) of the bottom plate 14 a of the chassis 14. The light reflecting sheet 23 is made of synthetic resin, and the surface thereof is white with excellent reflectivity, and is laid so as to cover almost the entire region along the inner surface of the bottom plate 14a of the chassis 14 (FIG. 3). (The light reflection sheet is not shown). With this light reflecting sheet 23, it is possible to reflect the light emitted from the cold cathode tube 17 toward the diffusion plate 15a.

  On the other hand, a diffusion plate 15a and an optical sheet 15b are disposed on the opening 14b side of the chassis 14. The diffusion plate 15a is formed by dispersing and mixing light scattering particles in a plate member made of synthetic resin, and has a function of diffusing linear light emitted from the cold cathode tube 17 serving as a linear light source. As described above, the short side edge portion of the diffusion plate 15a is placed on the first surface 20a of the holder 20, and is not subjected to vertical restraining force. On the other hand, the long side edge of the diffusion plate 15 a is fixed by being sandwiched between the chassis 14 and the frame 16.

  The optical sheet 15b disposed on the diffusion plate 15a is a laminate of a diffusion sheet, a lens sheet, and a reflective polarizing plate in order from the diffusion plate 15a side. The optical sheet 15b is emitted from the cold cathode tube 17 and passes through the diffusion plate 15a. It has a function of converting the light that has passed through into planar light. The liquid crystal panel 11 is installed on the upper surface side of the optical sheet 15 b, and the optical sheet 15 b is sandwiched between the diffusion plate 15 a and the liquid crystal panel 11.

  The cold-cathode tube 17 has a long and narrow tubular shape, and a large number (20 in this embodiment) are parallel to each other in a state in which the length direction (axial direction) thereof coincides with the long side direction of the chassis 14. They are housed in the chassis 14 in a line-up state (see FIG. 2). Each end of the cold cathode tubes 17 is provided with a terminal (not shown) for receiving driving power, the end is fitted into the relay connector 19, and a holder 20 is attached so as to cover the relay connector 19. It has been.

  The holder 20 that covers the end of the cold cathode tube 17 is made of a synthetic resin that exhibits white color, and has a long and narrow box shape that extends along the short side direction of the chassis 14. The holder 20 is arranged so as to partially overlap the short side outer edge portion 21a of the chassis 14, and constitutes the side wall of the backlight device 12 together with the short side outer edge portion 21a. As shown in FIG. 3, the insertion pin 24 protrudes from the surface of the holder 20 that faces the folded outer edge portion 21 a of the chassis 14, and the insertion pin 24 is formed on the upper surface of the short-side outer edge portion 21 a of the chassis 14. The holder 20 is attached to the chassis 14 by being inserted into the insertion hole 25.

  As shown in FIG. 3, the stepped surface of the holder 20 consists of three surfaces parallel to the bottom plate 14a of the chassis 14, and the short side edge of the diffusion plate 15a is placed on the first surface 20a at the lowest position. Has been. Further, an inclined cover 26 that extends toward the bottom plate 14a of the chassis 14 extends from the first surface 20a. The short side edge portion of the liquid crystal panel 11 is placed on the second surface 20 b of the stepped surface of the holder 20. The third surface 20 c at the highest position among the stepped surfaces of the holder 20 is disposed at a position overlapping the short side outer edge portion 21 a of the chassis 14 and is in contact with the bezel 13.

  As shown in FIGS. 2 and 4, the inverter board 30 and the control board 40 are attached to the outer side of the bottom plate 14 a of the chassis 14 (the side opposite to the cold cathode tube 17, the back side). The above-described power supply board P (see FIG. 1, not shown in FIG. 4) is electrically connected to the inverter board 30, the control board 40, and the like, and serves as a power supply source that supplies power thereto.

  The inverter board 30 is provided at both ends of the long side direction of the chassis 14 and has a long rectangular shape along the short side direction of the chassis 14. Each inverter board 30 is electrically connected to the cold cathode tube 17 via a connector 27 and a harness 28. Further, the inverter board 30 boosts the input voltage input from the power supply board P by an inverter circuit constituted by a transformer or the like, and outputs an output voltage higher than the input voltage to the cold cathode tube 17. 17 has a function of controlling turning on (or turning off).

  As shown in FIG. 4, the control board 40 (circuit board) has a rectangular shape, and is centered in the long side direction of the chassis 14 and is biased to one side in the short side direction of the chassis 14 (FIG. 4). (Upper side). The control board 40 has a circuit component 41 mounted on a board made of synthetic resin (for example, made of paper phenol or glass epoxy resin), and receives various input signals such as TV signals from the tuner T as signals for driving the liquid crystal. And a function of supplying the converted liquid crystal driving signal to the liquid crystal panel 11.

  As shown in FIGS. 2 and 5, a board cover 60 is attached to the bottom plate 14 a of the chassis 14 so as to cover the control board 40, and a board cover 31 is attached so as to cover each inverter board 30. Yes. 4 shows the chassis 14 with the substrate covers 60 and 31 removed. Such substrate covers 60 and 31 have a function of protecting the substrates 40 and 30 and preventing a hand from touching the substrate when the substrate becomes hot when the substrate is driven. .

  As shown in FIGS. 5 and 6, the substrate cover 60 is a plate-like member having a square shape in a plan view, and a central portion 61 having a substantially U shape in a sectional view opened toward the chassis 14 side. And end portions 62 respectively extending along the bottom plate 14a from both ends (left and right ends in FIG. 5) in the long side direction of the chassis 14 of the central portion 61.

  Next, a structure for attaching the control board 40 and the board cover 60 to the chassis 14 will be described. On the surface of the bottom plate 14a of the chassis 14 on the outer side of the chassis 14, a plurality of mounting base portions 50 (mounting portions) are formed at the mounting positions of the control board 40, as shown in FIG. Are arranged so as to straddle the mounting pedestal 50.

  The mounting base portion 50 has a circular shape in plan view, and is formed by protruding a part of the bottom plate 14 a to the outer surface side of the chassis 14. As shown in FIG. 5, the mounting base 50 is formed at positions corresponding to the four corners of the control board 40 having a square shape.

  As shown in FIG. 6, each mounting base 50 is provided with a substantially cylindrical bolt member 70 (protrusion) that protrudes toward the substrate cover 60. The bolt member 70 extends such that its protruding direction coincides with a direction (Z-axis direction) perpendicular to the extending direction (X-axis and Y-axis directions, left-right direction in FIG. 6) of the bottom plate 14a of the chassis 14. . The bolt member 70 is inserted into both the board side insertion hole 45 formed in the control board 40 and the cover side insertion hole 65 (insertion hole) formed in the end portion 62 of the substrate cover 60.

  The bolt member 70 is formed in a shape in which the protruding length L1 from the mounting base portion 50 is longer than the total thickness of the board thickness t1 of the board cover 60 and the board thickness t2 of the control board 40, As shown in FIG. 6, in a state where the control board 40 and the board cover 60 are attached to the chassis 14, the tip of the bolt member 70 protrudes outside the chassis 14 (upper side in FIG. 6).

  The bolt member 70 is provided with a nut member 80 (locking portion). The nut member 80 has a hexagonal shape in plan view, and is configured such that the bolt member 70 is inserted through a through hole 81 formed in the center portion of the nut member 80 in plan view. The bolt member 70 and the nut member 80 are screwed to each other by screws (single-thread screws) formed on the inner peripheral surface of the through hole 81 and the outer peripheral surface of the bolt member 70.

  As shown in FIG. 6, the nut member 80 screwed into the bolt member 70 is disposed in such a manner as to sandwich the substrate cover 60 with the chassis 14. Thereby, the nut member 80 is configured to lock the substrate cover 60 to the chassis 14. More specifically, the end portion of the control substrate 40 and the end portion 62 of the substrate cover 60 are sandwiched between the mounting base portion 50 and the nut member 80.

  In the present embodiment, the mounting base 50 is formed in the bottom plate 14a of the chassis 14 at locations corresponding to both ends in the long side direction of the inverter board 30, and the inverter board 30 and the board cover 31 are connected to the bolt member 70. And it becomes the structure which can be attached via the nut member 80. FIG. Since the mounting structure for mounting the inverter board 30 and the board cover 31 to the mounting base part 50 is the same as the mounting structure for mounting the control board 40 and the board cover 60 to the mounting base part 50, detailed description is omitted.

  Next, a procedure for attaching the control board 40 and the board cover 60 to the chassis 14 in the backlight device 12 of the present embodiment will be described. In the present embodiment, the chassis 14 is placed vertically with a holder (not shown) or the like, that is, the extended surface of the bottom plate 14a of the chassis 14 is along the vertical direction (state shown in FIG. 4). Thus, the control board 40 and the board cover 60 are attached. In the present embodiment, the backlight device 12 is held such that the side of the chassis 14 on which the control board 40 is arranged (the upper side in FIG. 4) is the upper side in the vertical direction.

  First, as shown in FIG. 6, the control board 40 is arranged so that each bolt member 70 is inserted into each board side insertion hole 45 of the control board 40. As a result, the control board 40 is held (temporarily held) with respect to the chassis 14.

  Subsequently, the substrate cover 60 is disposed so as to cover the control substrate 40 from the outside of the chassis 14. Specifically, the substrate cover 60 is arranged so that each bolt member 70 is inserted into each cover side insertion hole 65 of the substrate cover 60. Thereby, the substrate cover 60 is held (temporarily held) with respect to the chassis 14 (state shown in FIG. 6). In this state, the end portions 62 of the substrate cover 60 and the peripheral end portions on the left and right sides of the control substrate 40 are arranged so as to overlap each other in plan view.

  Next, the nut member 80 is screwed into the bolt member 70. As a result, the control board 40 and the board cover 60 are sandwiched between the mounting base 50 and the nut member 80. As a result, the nut board 80 locks the control board 40 and the board cover 60 to the chassis 14, and the attachment of the control board 40 and the board cover 60 to the chassis 14 is completed.

  As described above, the backlight device 12 of the present embodiment is attached to the cold cathode tube 17, the chassis 14 in which the cold cathode tube 17 is accommodated, the control board 40 attached to the chassis 14, and the chassis 14. A board cover 60 arranged to cover the control board 40 and a nut member 80 for locking the board cover 60 to the chassis 14. A bolt member 70 that protrudes toward the substrate cover 60 is provided. A cover-side insertion hole 65 through which the bolt member 70 is inserted is formed in the substrate cover 60, and the nut member 80 is bolted to the cover-side insertion hole 65. The board cover 60 in a state where the member 70 is inserted can be locked to the chassis 14 so as to be sandwiched between the board 14 and the chassis 14. It is attached to preparative member 70 composed.

  In the present embodiment, the board cover 60 can be held with respect to the chassis 14 by inserting the bolt member 70 through the cover side insertion hole 65. Thereby, after inserting the bolt member 70 through the cover side insertion hole 65, it is not necessary to hold the substrate cover 60 by hand, and workability can be improved. The nut member 80 is configured so that the board cover 60 in a state where the bolt member 70 is inserted into the cover side insertion hole 65 can be locked to the chassis 14 so as to be sandwiched between the nut 14 and the chassis 14. Is attached.

  For this reason, the situation where the board cover 60 is detached from the bolt member 70 can be suppressed, and the board cover 60 can be securely fixed to the chassis 14. In the present embodiment, it is usually unnecessary to use screws or the like used to fix the substrate cover 60, and the substrate cover 60 can be fixed to the chassis 14.

  Note that the mounting structure of the substrate cover 60 of the present embodiment is particularly in a state where the chassis 14 is vertically placed with a holder (not shown) or the like, that is, the extended surface of the bottom plate 14a of the chassis 14 is along the vertical direction. It is suitable for the case. This is because, conventionally, when the substrate cover 60 is attached to a predetermined position of the bottom plate 14a along the vertical direction, the substrate cover 60 falls if the substrate cover 60 is not held. For this reason, the operator needs to attach the substrate cover 60 while holding the substrate cover 60 by hand. Further, when the substrate cover 60 is held by hand or the like, there is a concern that the substrate cover 60 may fall from the hand.

  In this respect, in the present embodiment, when the cover side insertion hole 65 is inserted into the bolt member 70, the substrate cover 60 can be held by being hooked to the chassis 14, and then the substrate cover 60 is held by the nut member 80. Can be fixed. For this reason, it is not necessary to hold the substrate cover 60 by hand or the like, and workability is improved. Moreover, the fall of the substrate cover 60 concerned when holding the substrate cover 60 with a hand etc. can be suppressed.

  Moreover, in this embodiment, the bolt member 70 and the nut member 80 which are a comparatively simple structure are used, and the cost concerning manufacture can be reduced.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 7, in the backlight device 112 of the present embodiment, similarly to the above-described embodiment, the bolt member 170 (protrusion) and the nut member 180 (locking portion) are screwed together to form a board cover. 60 was fixed to the chassis 14. The outer periphery of the bolt member 170 and the through hole 181 formed in the nut member 180 are each formed with a double thread, and the nut member 180 and the bolt member 170 have a double thread (an example of a multiple thread). Are screwed together.

  As described above, when the bolt member 170 and the nut member 180 are screwed together by the double thread, the nut member 180 is screwed to the bolt member 170 as compared to the structure using the single thread. The work speed can be improved and workability is improved. Note that the screwing of the nut member 180 and the bolt member 170 is not limited to a double thread, and the number of threads can be changed as appropriate. Moreover, you may use the screw | thread with many numbers of threads rather than a double thread.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 8, in the backlight device 212 of the present embodiment, a projecting portion 270 having a substantially cylindrical shape is provided instead of the bolt members 70 and 170 of the above embodiment. The protrusion 270 is formed, for example, by protruding a part of the mounting base part 50 toward the substrate cover 60.

  The protrusion 270 can be inserted into both the board side insertion hole 45 and the cover side insertion hole 65. A locking portion 280 is attached to the distal end side of the protrusion 270 inserted through both the insertion holes 45 and 65. As shown in FIG. 9, the locking portion 280 has an annular shape in plan view having a locking portion side insertion hole 281, and is an elastic member such as rubber, for example.

  A plurality of protrusions 282 are formed on the inner peripheral surface of the locking portion side insertion hole 281. As shown in FIG. 9, the protrusions 282 have a substantially triangular shape in cross-section extending in the Z-axis direction, and the plurality of protrusions 282 are arranged over the entire circumference of the inner peripheral surface of the locking portion side insertion hole 281. Has been. Further, the inner diameter of the locking portion side insertion hole 281 (the diameter of the circle connecting the tips of the protrusions 282) is set slightly smaller than the outer diameter of the protrusion 270.

  With the above configuration, the distal end of the protrusion 282 is pressed against the outer peripheral surface of the protrusion 270 by inserting the protrusion 270 while expanding the engagement portion side insertion hole 281 of the engagement portion 280. Thereby, it becomes the structure (structure where a latching | locking part is attached to a protrusion) to which the latching | locking part 280 is attached with respect to the protrusion 270. FIG. As described above, the plurality of protrusions 282 abut on the protrusions 270, so that the situation in which the locking portions 280 drop off from the protrusions 270 can be more reliably suppressed, and the control board 40 and the board cover 60 can be more reliably connected to the chassis. 14 can be fixed.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 10, in the backlight device 312 according to the present embodiment, a protrusion 370 having a substantially cylindrical shape is provided on the mounting base 50, and the cap member 380 covers the tip of the protrusion 370. (Locking part) is attached.

  The cap member 380 is made of, for example, an elastic member such as rubber and has a circular tubular shape. The cap member 380 is formed on a main body 381 that is externally inserted into the protrusion 370 and an end on the back side (upper side in FIG. 10) of the main body 381. And a flange portion 382. The main body portion 381 has a fitting portion 381A opened on the front side (the lower side in FIG. 10). The diameter of the fitting portion 381A (the inner diameter of the main body portion 381) is set slightly smaller than the outer diameter of the protrusion 370, and the main body portion 381 is elastically deformed so that the diameter of the fitting portion 381A is widened. Thus, the fitting portion 381A can be fitted to the protrusion 370. Further, the outer diameter of the main body 381 is set to be slightly smaller than the hole diameter of the cover side insertion hole 65 (or the substrate side insertion hole 45). With the above configuration, the main body 381 can be inserted into the cover-side insertion hole 65 and the board-side insertion hole 45, and the outer peripheral surface of the projection 370 and the cover-side insertion hole 65 and the board-side insertion hole 45 It is configured to be interposed between the peripheral surface.

  Thereby, the cap member 380 can be attached to the protrusion 370 by fitting the main body 381 (fitting part 381 </ b> A) to the protrusion 370. And in the state which attached the cap member 380 in the form which covers the front-end | tip of the protrusion 370, it becomes the structure which clamps the control board 40 and the board | substrate cover 60 between the flange part 382 and the attachment base part 50, The control board 40 and the board cover 60 can be locked to the chassis 14. Moreover, safety | security can be made higher by covering the front-end | tip of the projection part 370 with the cap member 380. FIG.

<Embodiment 5>
Next, a fifth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIGS. 11 and 12, the backlight device 412 of the present embodiment has a configuration in which an E ring 480 (snap ring, locking portion) is extrapolated to a projection 470 having a substantially cylindrical shape. .

  A groove portion 471 is formed on the outer peripheral surface of the projecting portion 470 so as to extend over the entire circumference, and an E-ring 480 can be fitted into the groove portion 471. More specifically, three contact portions 481 are provided on the inner peripheral surface of the E ring 480 so as to protrude inward, and each contact portion 481 is pressed against the bottom surface of the groove portion 471. Thus, the E ring 480 is attached to the protrusion 470. Further, the E-ring 480 is attached to the groove portion 471 so that movement in the Z-axis direction is restricted. With the above configuration, the E-ring 480 can lock the board cover 60 (and the control board 40) to the chassis 14 so as to be sandwiched between the chassis 14 (mounting base 50). Thus, the substrate cover 60 can be fixed only by extrapolating the E-ring 480 to the protrusion 470, and workability can be improved. Note that a snap ring other than the E ring 480 may be fitted in the groove portion 471.

<Embodiment 6>
Next, a sixth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 13, in the backlight device 512 of this embodiment, a plate-like member 560 is provided on the mounting base portion 50. The plate member 560 is formed by bending a shape memory alloy (SMA) plate material such as Ni—Ti or Cu—Zn—Al, for example.

  When the temperature of the plate-like member 560 is higher than the transformation point temperature (predetermined temperature), the tip portion 580 (locking portion) is in a direction along the plate surface of the substrate cover 60 (for example, the X-axis direction). It is stored in advance so as to return to a shape (the shape shown in FIG. 14) that extends and has a length in the same direction larger than the diameter of the cover side insertion hole 65.

  In the present embodiment, the substrate cover 60 is locked to the chassis 14 as follows. First, as shown in FIG. 13, the plate-like member 560 is formed in a shape that tapers toward the distal end portion in a state where the temperature is lower than the transformation point temperature. Then, the plate-like member 560 is inserted through the cover side insertion hole 65 and the substrate side insertion hole 45. By making the plate-like member 560 into a tapered shape, the insertion work into the cover side insertion hole 65 and the board side insertion hole 45 becomes easy.

  Then, in a state where the cover side insertion hole 65 and the substrate side insertion hole 45 are inserted into the base end portion 570 (projection) of the plate member 560, the plate member 560 is set to a temperature higher than the transformation point temperature. Heat. Then, as shown in FIG. 14, the front end portion 580 of the plate-like member 560 is widened, and returns to a shape that locks the substrate cover 60 with respect to the chassis 14.

  In the present embodiment, by setting the plate-like member 560 to a temperature equal to or higher than the transformation point temperature, the tip portion 580 can be deformed into a shape that is locked to the chassis 14 so as to be sandwiched between the chassis 14. . With such a configuration, it is possible to easily perform the operation of locking the front end 580 to the substrate cover 60, which is preferable. In the case where the plate-like member 560 is provided at a plurality of locations (for example, four locations corresponding to the four corners of the substrate cover 60) in the substrate cover 60, the front end portions 580 are collectively gathered due to temperature changes. Since it can be transformed into a shape to be locked to the substrate cover 60, workability can be greatly improved.

  The transformation point temperature of the plate-like member 560 can be set as appropriate. For example, it is preferable to set the transformation point temperature to a temperature lower than the heat resistance temperature of the circuit component mounted on the control board 40.

<Embodiment 7>
Next, a seventh embodiment of the present invention will be described with reference to FIGS. 15 and 16. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 15, the backlight device 612 of the present embodiment includes a protrusion 670 formed on the mounting base 50 and a locking portion 680 formed on the tip of the protrusion 670.

  Both the protrusion 670 and the locking part 680 have a columnar shape. The diameter of the protrusion 670 is set smaller than the hole diameter of the cover side insertion hole 65 (or the substrate side insertion hole 45). The diameter of the locking portion 680 is set larger than the diameter of the cover side insertion hole 65 (or the board side insertion hole 45).

  A locking portion side groove 681 is formed on the surface of the locking portion 680 on the protruding end side (tip, upper side in FIG. 15). The locking portion side groove 681 is formed in a shape extending in the Y-axis direction as shown in FIG. 16, and is formed to a depth reaching the protrusion 670 as shown in FIG. By forming the locking portion side groove portion 681 in this way, the locking portion 680 is configured to be elastically deformable in a shape having a diameter smaller than the hole diameter of the cover side insertion hole 65. Specifically, in the plan view of FIG. 16, the locking portion 680 is deformed in a reduced diameter by reducing the diameter of the locking portion 680 in the X-axis direction by the groove width W1 of the locking portion-side groove 681. be able to.

  According to the configuration of the present embodiment, the locking portion 680 and the protrusion 670 are inserted into the cover side insertion hole 65 in a state where the locking portion 680 is deformed to a diameter smaller than the hole diameter of the cover side insertion hole 65. Let In a state where the cover side insertion hole 65 passes through the locking portion 680 and is inserted into the protrusion 670, the locking portion 680 is elastically restored to a diameter larger than the hole diameter of the cover side insertion hole 65. Thereby, the latching | locking part 680 can latch to the said chassis 14 in the form which pinches | interposes the board | substrate cover 60 (and control board 40) between the chassis 14. FIG.

  In the present embodiment, the peripheral end of the surface on the protruding end side of the locking portion 680 may be an inclined surface 682 (tapered) (the inclined surface 682 is indicated by a broken line). With such a configuration, for example, when the locking portion 680 is inserted into the cover side insertion hole 65, the locking portion 680 is pressed by pressing the inclined surface 682 at the hole edge of the cover side insertion hole 65. Can be deformed in a reduced diameter, and the locking portion 680 can be inserted through the cover side insertion hole 65. That is, the engaging portion 680 can be deformed in a reduced diameter simultaneously with the insertion operation of the engaging portion 680, and workability can be improved.

<Eighth embodiment>
Next, an eighth embodiment of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 17, in the backlight device 712 of the present embodiment, a projection 770 having a circular tube shape is formed on the mounting base portion 50. Then, after the protrusion 770 is inserted through the cover side insertion hole 65, the end of the protrusion 770 is caulked with a dedicated tool 790 or the like, thereby forming the locking portion 780. In this way, if the locking portion 780 is formed by caulking the tip of the protrusion 770, the board cover 60 can be locked to the chassis 14 more firmly.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) The shape of the cover side insertion hole 65 and the protrusion, the formation location, the number, and the like are not limited to those of the above configuration, and can be changed as appropriate.

  (2) The shape of the mounting base part 50 is not limited to the thing of the said embodiment. Further, the board cover 60 and the control board 40 may be configured to be attached to a portion of the bottom plate 14a of the chassis 14 where the mounting base 50 is not formed. That is, the formation part of a protrusion is not limited to the attachment base part 50, It can change suitably.

  (3) In the above embodiment, the control board 40 is exemplified as the circuit board, but the present invention is not limited to this. If it is a circuit board and a board | substrate cover attached to the chassis 14, it is possible to apply the structure (structure fixed with a protrusion and a latching | locking part) of this invention.

  (4) In the above embodiment, the control board 40 and the board cover 60 are both fixed by the protrusions and the locking parts. However, the present invention is not limited to this. For example, the control board 40 may be fixed to the chassis with screws or the like, and only the board cover 60 may be fixed by the configuration of the present invention (configuration that is fixed by the protrusion and the locking portion).

  (5) Although the case where the cold cathode tube 17 is used as the light source has been described in the above embodiment, the present invention is not limited to this. It is also possible to use a hot cathode tube or an LED as the light source.

  (6) In the above embodiment, the liquid crystal panel 11 and the chassis 14 are vertically placed with their short sides aligned with the vertical direction. However, the liquid crystal panel 11 and the chassis 14 have their long sides aligned. What is made into the vertical installation state matched with the perpendicular direction is also contained in this invention.

  (7) Although the TFT is used as the switching element of the liquid crystal display device 10 in the above embodiment, the present invention can also be applied to a liquid crystal display device using a switching element other than the TFT (for example, a thin film diode (TFD)), and color display. In addition to the liquid crystal display device, the present invention can be applied to a liquid crystal display device that displays black and white.

  (8) In the above embodiment, the liquid crystal display device 10 using the liquid crystal panel 11 as the display panel has been illustrated, but the present invention is also applicable to display devices using other types of display panels.

  (9) In the above embodiment, the television receiver TV including the tuner is illustrated, but the present invention can also be applied to a display device not including the tuner.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12, 112, 212, 312, 412, 512, 612, 712 ... Backlight device (illumination device), 14 ... Chassis, 17 ... Cold Cathode tube (light source), 40 ... control board (circuit board), 60 ... board cover, 65 ... cover side insertion hole (insertion hole), 70, 170 ... bolt member (projection), 80, 180 ... nut member (engagement) Stop part), 281 ... Locking part side insertion hole, 282 ... Projection part, 270, 370, 470, 670, 770 ... Projection part, 280, 680, 780 ... Lock part, 380 ... Cap member (locking part) , 382 ... Flange part, 480 ... E ring (snap ring, locking part), 570 ... Base end part (projection part), 580 ... Tip part (locking part), 681 ... Locking part side groove part, TV ... TV Receiver

Claims (12)

A light source;
A chassis that houses the light source;
A circuit board attached to the chassis;
A board cover attached to the chassis and arranged to cover the circuit board;
A locking portion for locking the substrate cover to the chassis,
The mounting portion of the board cover in the chassis is provided with a protrusion that protrudes toward the board cover,
The board cover is formed with an insertion hole through which the protrusion is inserted,
The locking portion is attached to the protrusion so that the board cover in a state where the protrusion is inserted into the insertion hole can be locked to the chassis in a form sandwiched between the chassis and the chassis. A lighting device characterized by comprising: The protrusion is a bolt member,
The lighting device according to claim 1, wherein the locking portion is a nut member screwed into the bolt member.   The lighting device according to claim 2, wherein the nut member and the bolt member are screwed together via a multi-thread screw. The locking part has a locking part side insertion hole through which the protrusion can be inserted,
By inserting the protrusion into the engaging part side insertion hole, the engaging part is attached to the protruding part,
The lighting device according to claim 1, wherein a plurality of protrusions that are in contact with the protrusions are formed on an inner peripheral surface of the locking portion side insertion hole. The locking portion is a cap member attached to the protrusion so as to cover the tip of the protrusion,
The lighting device according to claim 1, wherein a flange portion that sandwiches the substrate cover with the chassis is formed on the cap member.   The lighting device according to claim 1, wherein the locking portion is a snap ring that is extrapolated to the protrusion.   The locking portion is made of a shape memory alloy, and is locked to the chassis at a predetermined temperature in such a manner that the substrate cover in a state where the protrusion is inserted into the insertion hole is sandwiched between the chassis and the chassis. The illuminating device according to claim 1, wherein the illuminating device returns to the above. The locking portion is formed at the tip of the protrusion and has a cylindrical shape having a diameter larger than the diameter of the insertion hole,
The engaging part side groove part is formed at the tip of the engaging part, so that the engaging part can be elastically deformed into a shape having a diameter smaller than the diameter of the insertion hole. Item 2. The lighting device according to Item 1.   The lighting device according to claim 1, wherein the locking portion is formed by caulking a tip of the protrusion. The lighting device according to any one of claims 1 to 9,
And a display panel that performs display using light from the lighting device.   The display device according to claim 10, wherein the display panel is a liquid crystal panel using liquid crystal.   A television receiver comprising the display device according to claim 10.

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