JP2013118055A - Lighting apparatus, display device and tv receiving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate deformation of reflection members while securing easiness of assembly works.SOLUTION: A backlight device 12 includes LEDs 17, diffusion lenses 19 covering the LEDs 17 from the surface side, a chassis 14 equipped with bottom plates 14a arranged at the rear of the LEDs 17, a reflection sheet 21 equipped with lens insertion through-holes 21d, for the diffusion lenses 19 to pass through, each intercalated between the bottom plate 14a and the diffusion lens 19, extended along a plate face of the bottom plate 14a for reflecting light, regulating parts 22 each structured of at least a part of a hole edge of the lens insertion through-hole 21dA in the reflection sheet 21 and can regulate the reflection sheet 21 from displacement toward a surface side by being arranged at a position overlapping with the diffusion lens 19 as seen from the surface side, and spread allowing parts 23 each fitted at the hole edge of the lens insertion through-hole 21dA of the reflection sheet 21 for allowing the lens insertion through-hole 21dA to spread to displace the regulating part 22 to a position not any more overlapping with the diffusion lens 19 as seen from the surface side.

Description

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

  In recent years, display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display panels such as liquid crystal panels and plasma display panels, which enables thinning of image display devices. Since the liquid crystal panel used for the liquid crystal display device does not emit light by itself, a backlight device is separately required as a lighting device, and the backlight device is roughly classified into a direct type and an edge light type according to the mechanism. In order to achieve high brightness of the liquid crystal display device, it is preferable to use a direct type backlight device, and an example described in Patent Document 1 below is known.

  The direct-type backlight device described in Patent Document 1 is designed to be installed on the back side of the liquid crystal panel (the side opposite to the light emitting side), and a chassis having an open surface on the liquid crystal panel side; A plurality of LEDs housed in the chassis, a lens member arranged so as to individually cover the LEDs from the front side, an LED substrate on which the LEDs are mounted and to which the lens member is attached, and extends along the inner surface of the chassis And a reflection sheet that is arranged to cover the LED substrate and reflects the light toward the opening of the chassis, and an optical that is arranged at the opening of the chassis and efficiently emits the light emitted from the LED to the liquid crystal panel side A member (a diffusion sheet or the like).

JP 2011-34948 A

  In the backlight device configured as described above, an insertion hole through which the lens member is passed is provided in the reflection sheet. The hole diameter of the insertion hole is larger than the diameter dimension of the lens member, whereby it is possible to lay a reflection sheet from the front side on the LED substrate in a state where the LED and the lens member are assembled, Ease of assembly work is guaranteed. However, if the hole edge of the insertion hole is displaced to the front side when the reflection sheet is deformed, the emitted light from the lens member is blocked by the hole edge of the insertion hole, which may cause uneven brightness.

  This invention is completed based on the above situations, Comprising: It aims at regulating the deformation | transformation of a reflecting member, ensuring the ease of an assembly | attachment operation | work.

  An illuminating device of the present invention includes a light source, an optical element that covers the light source from its light emitting side, and that applies an optical action to the light from the light source to emit the light, and the light source. On the other hand, a chassis having a bottom plate disposed on the opposite side of the light emitting side, and a chassis interposed between the bottom plate and the optical element of the chassis and extending along the plate surface of the bottom plate. A reflection member that reflects light and is configured to include a reflection member having an insertion hole through which the optical element passes, and at least a part of a hole edge of the insertion hole in the reflection member; And disposed at a position that overlaps when viewed from the light emitting side, and is provided at a restriction portion that can restrict displacement of the reflecting member to the light emitting side, and at a hole edge of the insertion hole in the reflecting member. And the restricting portion is the optical element. To displace to a position to be seen by non-overlapping from the light emission side with respect to, and a widening permitting portion for expanding the insertion hole.

  In this way, when the light source is turned on, the light from the light source is emitted after an optical action is imparted by the optical element arranged so as to cover the light source from the light emitting side. The light existing in the illumination device is arranged in a form interposed between the bottom plate of the chassis and the optical element and reflected by a reflecting member extending along the plate surface of the bottom plate, to the light emitting side. Thus, it is effectively used as the emitted light of the lighting device.

  By the way, when the reflecting member is deformed such as warping or bending and the reflecting member is displaced to the light emitting side with respect to the optical element, there is a concern that the light from the optical element is blocked by the reflecting member. In that respect, in the present invention, the reflecting member is arranged at a position where the restricting portion configured by at least a part of the hole edge of the insertion hole in the reflecting member overlaps the optical element when viewed from the light emitting side. Displacement to the light exit side is restricted. Thereby, it is possible to prevent the light from the optical element from being blocked by the reflecting member, and thus unevenness is hardly generated in the emitted light of the illumination device.

  Here, as described above, when the restricting portion is provided at a position overlapping the optical element when viewed from the light emitting side, when the lighting device is assembled, the reflecting member is moved in the state where the optical element is already provided. There is a concern that it is difficult to perform the operation in the procedure of assembling from the light emitting side of the optical element. In that respect, in the present invention, since the expansion allowance portion is provided at the hole edge of the insertion hole in the reflection member, when assembling the reflection member, the expansion portion is expanded by the expansion allowance portion, thereby the restriction portion. Is displaced to a position where the optical element is not superposed when viewed from the light emitting side. Thereby, the operation | work which attaches a reflection member with respect to the existing optical element from the light emission side can be performed easily.

The following configuration is preferable as an embodiment of the present invention.
(1) A plurality of the light sources are mounted and a plurality of the optical elements are attached so as to individually cover the plurality of light sources, and a light source substrate disposed on the light emitting side with respect to the bottom plate of the chassis is provided. The reflection member is disposed so as to be interposed between the optical element and the light source substrate, and has a plurality of insertion holes through which the plurality of optical elements are individually passed. In this way, even when the reflecting member is assembled from the light emitting side to the light source substrate on which a plurality of light sources are mounted and a plurality of optical elements are attached, the insertion hole is expanded by the expansion allowing portion. By opening it, the restricting portion is displaced to a position where it is non-overlapping when viewed from the light emitting side with respect to the optical element, so that the assembling work of the reflecting member can be easily performed. Thereby, since the light source and the optical element can be assembled in advance on the light source substrate, the productivity is high, which is advantageous in terms of cost.

(2) A plurality of the light source boards are arranged in a state of being arranged in a plate surface of the bottom plate of the chassis, and the reflection member extends along the plate surface of the bottom plate and a plurality of the light sources. It has a bottom portion arranged in a manner straddling the substrate. In this way, after assembling the plurality of light source boards in a state where they are arranged in the plate surface of the bottom plate of the chassis, the reflection has a bottom portion that extends along the bottom plate and is arranged in a manner straddling the plurality of light source substrates. The member can be easily assembled to each light source substrate from the light emitting side. Since the light source and the optical element can be assembled in advance on each of the plurality of light source substrates, the productivity is higher and the cost is more advantageous.

(3) A plurality of the insertion holes are arranged in a line in the plane of the bottom of the reflecting member, and the plurality of insertion holes are arranged at least at the corners of the bottom. The insertion hole has at least a part of the hole edge as the restricting portion and is provided with the expansion allowance portion at the hole edge. The insertion hole arranged at the corner position of the bottom of the reflecting member tends to be displaced with respect to the optical element due to the influence of dimensional error or assembly error, compared to the insertion hole arranged on the center side thereof, As a result, the hole edge is easily displaced toward the light emitting side with respect to the optical element. In this regard, with respect to the insertion holes arranged at least at the corners of the bottom of the plurality of insertion holes as described above, at least a part of the hole edge is used as a restricting portion, and an expansion allowing portion is provided on the hole edge. In this case, the displacement of the hole edge of the insertion hole with respect to the optical element can be restricted by the restricting portion, and the ease of assembling work can be sufficiently ensured by the widening allowance portion.

(4) The reflection member has a rising portion that rises from the end of the bottom portion toward the light emitting side, and is disposed at a position adjacent to at least the rising portion among the plurality of insertion holes. The insertion hole has at least a part of the hole edge as the restricting portion and is provided with the expansion allowance portion at the hole edge. In this way, the rising part from the end of the bottom part toward the light emitting side can reflect the light existing in the lighting device while angling the light in accordance with the rising angle from the bottom part. The hole edge of the insertion hole arranged at a position adjacent to the rising part tends to be affected by residual stress accompanying the rising part rising from the bottom part, and is easily deformed. Thus, with respect to the insertion hole, if at least a part of the hole edge is used as a restricting portion and an opening allowance portion is provided at the hole edge, the restriction portion restricts the displacement of the hole edge of the insertion hole with respect to the optical element. In addition, the ease of assembling work can be sufficiently ensured by the expansion permitting portion.

(5) The insertion hole disposed at a position adjacent to at least the end portion of the light source substrate among the plurality of insertion holes is configured such that at least a part of the hole edge serves as the restriction portion and the hole edge includes the insertion hole. An expansion permitting portion is provided. Since the bottom of the reflecting member is arranged so as to straddle a plurality of light source substrates, steps and irregularities are likely to occur near the end of the light source substrate due to dimensional errors and assembly errors. Although the hole edge of the insertion hole arranged at a position adjacent to the end of the hole is likely to be deformed, as described above, at least a part of the hole edge is used as the restriction portion and the hole If the expansion allowance portion is provided at the edge, the displacement of the hole edge of the insertion hole with respect to the optical element can be restricted by the restriction portion, and the ease of assembly work is sufficiently ensured by the expansion allowance portion. be able to.

(6) The plurality of light source boards are arranged adjacent to each other in the plate surface of the bottom plate of the chassis and have board connection portions that electrically connect each other, whereas the reflection member In the bottom portion, a connection portion insertion hole through which the substrate connection portion passes is provided, and the insertion hole arranged at least adjacent to the connection portion insertion hole among the plurality of insertion holes, At least a part of the hole edge serves as the restricting portion, and the expansion allowance portion is provided at the hole edge. In the vicinity of the connection part insertion hole through which the board connection part passes, although it is difficult to install another structure that restricts deformation of the bottom part of the reflecting member for the convenience of the board connection part, as described above For the insertion holes arranged at least adjacent to the connection part insertion holes among the plurality of insertion holes, be sure to provide at least a part of the hole edge as a restricting part and provide an opening allowance part at the hole edge. For example, the displacement of the hole edge of the insertion hole with respect to the optical element can be restricted by the restricting portion, and the ease of assembling work can be sufficiently secured by the widening allowance portion.

(7) Between the optical element and the light source substrate, there is an optical element support portion that supports the optical element at a position away from the light source mounting surface of the light source substrate toward the light emitting side. The insertion hole has a hole diameter that surrounds the optical element support portion. In this case, the optical element can be supported by the optical element support portion at a position away from the light source mounting surface on the light source substrate toward the light emitting side, thereby sufficiently exerting the optical function of the optical element. Can do. Since the insertion hole has such a hole diameter as to surround the optical element support portion, the insertion hole can be easily passed through the optical element support portion when the reflecting member is assembled to the optical element from the light emitting side.

(8) The expansion allowing portion is configured by a slit formed at a hole edge of the insertion hole. In this way, when the reflecting member is assembled to the optical element from the light emitting side, the slit is widened to widen the insertion hole and the restricting portion to the optical element on the light emitting side. Is displaced to a non-overlapping position when viewed from above, and assembly is allowed. Since the slit can be closed after assembly, it is necessary to secure a large area of the reflective member as compared with the case where the opening allowance is provided by forming a partial opening at the hole edge of the insertion hole. And the range of formation of the restricting portion can be increased. As a result, more light can be reflected by the reflecting member to improve the light utilization efficiency, and the deformation preventing function of the reflecting member by the restricting portion can be improved.

(9) The restricting portion is disposed over the entire circumference of the hole edge of the insertion hole. If it does in this way, it can control more reliably that a reflective member displaces to the light emission side to an optical element with a regulation part arranged over the perimeter of a hole edge of an insertion hole.

(10) The slits are arranged so that a pair is positioned on a straight line at a hole edge of the insertion hole. If it does in this way, an insertion hole can be expanded easily and it is excellent in workability.

(11) The expansion allowance part is configured by an opening partly formed at a hole edge of the insertion hole. In this way, when the reflecting member is assembled to the optical element from the light emitting side, it is allowed to widen the insertion hole by the opening partly formed at the hole edge of the insertion hole. Accordingly, the restricting portion is displaced to a position where it is non-superimposed when viewed from the light emitting side with respect to the optical element, and assembly is allowed. As compared with the case where the opening allowance portion is provided by forming a slit at the hole edge of the insertion hole, the opening edge of the insertion hole is less likely to be cut off.

(12) Whereas the optical element has a substantially circular shape when viewed from the light emitting side, the insertion hole has a substantially oval shape when viewed from the light emitting side and has a long side dimension of the optical element. The short side dimension is smaller than the radial dimension of the optical element, whereas the long side edge of the hole of the insertion hole is viewed from the light emitting side, while the diameter is larger than the diameter. The opening is formed between a hole edge on the short side of the hole edge of the insertion hole and the optical element when viewed from the light emitting side, whereas the restriction portion overlaps with the optical element. Thus, the expansion allowance portion is configured. In this way, when the reflecting member is assembled to the optical element from the light emitting side, the reflecting member is constituted by the opening formed between the hole edge on the short side of the hole edge of the insertion hole and the optical element. The expansion allowing portion allows the insertion hole having a substantially oval shape to be widened along the short side direction. Accordingly, the restricting portion constituted by the long side edge is an optical element. On the other hand, it is displaced to a non-overlapping position when viewed from the light emitting side, and assembly is allowed.

  Next, in order to solve the above 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.

  According to such a display device, since the illumination device that supplies light to the display panel is difficult to generate interference fringes with the display panel, it is possible to realize display with excellent display quality. It becomes possible.

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

  ADVANTAGE OF THE INVENTION According to this invention, a deformation | transformation of a reflecting member can be controlled, ensuring the ease of an assembly | attachment operation | work.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Exploded perspective view showing schematic configuration of liquid crystal display device The top view which shows the arrangement structure of the chassis in the backlight apparatus with which a liquid crystal display device is equipped, a reflective sheet, and LED board (diffuse lens). Sectional view taken along line iv-iv in FIG. V-v sectional view of FIG. Enlarged plan view near the corner at the bottom of the reflective sheet Vii-vii sectional view of FIG. An enlarged plan view near the connector insertion hole on the center side at the bottom of the reflection sheet Sectional view taken along line ix-ix in FIG. The top view which shows arrangement | positioning structure of the control part with which the hole edge of a lens insertion hole is provided, and an expansion allowance part The top view which shows arrangement | positioning structure of the control part with which the hole edge of the lens penetration hole which concerns on Embodiment 2 of this invention is equipped, and the expansion | permission allowance part. The top view which shows the arrangement structure of the control part with which the hole edge of the lens penetration hole which concerns on Embodiment 3 of this invention is equipped, and a spreading | diffusion permission part. The top view which shows arrangement | positioning structure of the control part with which the hole edge of the lens penetration hole which concerns on Embodiment 4 of this invention is equipped, and an expansion allowance part. The top view which shows the arrangement configuration of the chassis which concerns on Embodiment 5 of this invention, a reflective sheet, and LED board (diffuse lens). Enlarged plan view near the center of the bottom of the reflective sheet

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Moreover, let the upper side shown in FIG.4 and FIG.5 be a front side, and let the lower side of the figure be a 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 source P, a tuner T, And a stand S. The liquid crystal display device (display device) 10 has a horizontally long (longitudinal) square shape (rectangular shape, rectangular shape) as a whole and is accommodated in a vertically placed state. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is 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 sequentially. Among these, the liquid crystal panel (display panel) 11 has a horizontally long rectangular shape when viewed from the front side (light emitting side), and a pair of glass substrates are bonded together with a predetermined gap therebetween, and both glasses The liquid crystal is sealed between the 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. The liquid crystal panel 11 is divided into a display area on the center side of the screen where an image can be displayed, and a non-display area having a frame shape (frame shape) surrounding the display area on the outer peripheral edge side of the screen. Can do. A polarizing plate is disposed on the outside of both substrates.

  Next, the backlight device 12 will be described in detail. As shown in FIG. 2, the backlight device 12 includes a chassis 14 having a substantially box shape having a light emitting portion (opening portion) 14 b opened on the front side (light emitting side, liquid crystal panel 11 side), and the chassis 14. The optical member 15 is disposed so as to cover the light emitting portion 14 b, and the frame 16 is disposed along the outer edge of the chassis 14 and holds the outer edge of the optical member 15 between the chassis 14. Further, in the chassis 14, an LED 17 (Light Emitting Diode) that is a light source, an LED substrate (light source substrate) 18 on which the LED 17 is mounted, and a diffusion lens attached to the LED substrate 18 at a position corresponding to the LED 17. (Optical element, lens member) 19. In addition, in the chassis 14, a board holding member 20 that can hold the LED board 18 with the chassis 14, and light in the chassis 14 is directed to the front side (light emitting side, optical member 15 side). And a reflecting sheet (reflecting member) 21 for reflecting the light. As described above, the backlight device 12 according to the present embodiment is a so-called direct type in which the LED 17 is arranged at a position directly below the display area of the liquid crystal panel 11 (optical member 15) in the chassis 14. Below, each component of the backlight apparatus 12 is demonstrated in detail.

  The chassis 14 is made of, for example, a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC). As shown in FIGS. 3 to 5, the chassis 14 has a horizontally long rectangular shape (rectangular shape, rectangular shape) like the liquid crystal panel 11. A bottom plate 14a, a side plate 14c rising from the outer end of each side (a pair of long sides and a pair of short sides) of the bottom plate 14a toward the front side (light emitting side), and outward from the rising end of each side plate 14c 14d, and is formed in a shallow box shape (substantially a dish shape) that opens toward the front side as a whole. The long side direction of the chassis 14 matches the X-axis direction, and the short side direction matches the Y-axis direction. The bottom plate 14 a in the chassis 14 is disposed on the back side of the LED substrate 18, that is, on the side opposite to the light emitting side of the LED 17. A frame 16 and an optical member 15 to be described below can be placed on each receiving plate 14d in the chassis 14 from the front side. A frame 16 is screwed to each receiving plate 14d. An attachment hole 14e for attaching the substrate holding member 20 is provided in the bottom plate 14a of the chassis 14 so as to open. A plurality of mounting holes 14e are dispersedly arranged corresponding to the mounting position of the substrate holding member 20 on the bottom plate 14a.

  As shown in FIG. 2, the optical member 15 has a horizontally long rectangular shape as viewed from the front side, like the liquid crystal panel 11 and the chassis 14. As shown in FIGS. 4 and 5, the optical member 15 has its outer edge portion placed on the receiving plate 14 d so as to cover the light emitting portion 14 b of the chassis 14 and to be interposed between the liquid crystal panel 11 and the LED 17. Arranged. The optical member 15 is opposed to the LED 17 with a predetermined interval on the front side, that is, on the light emitting side. The optical member 15 includes a diffusion plate 15a disposed on the back side (the side opposite to the LED 17 side and the light emitting side) and an optical sheet 15b disposed on the front side (the liquid crystal panel 11 side and the light emitting side). . The diffusing plate 15a has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light. The optical sheet 15b has a sheet shape that is thinner than the diffusion plate 15a, and two optical sheets 15b are laminated. Specific types of the optical sheet 15b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.

  As shown in FIG. 2, the frame 16 has a frame shape along the outer peripheral edge portions of the liquid crystal panel 11 and the optical member 15. An outer edge portion of the optical member 15 can be sandwiched between the frame 16 and each receiving plate 14d (FIGS. 4 and 5). The frame 16 can receive the outer edge portion of the liquid crystal panel 11 from the back side, and can sandwich the outer edge portion of the liquid crystal panel 11 with the bezel 13 disposed on the front side (FIGS. 4 and 5). ).

  Next, the LED 17 and the LED substrate 18 on which the LED 17 is mounted will be described. As shown in FIGS. 4 and 5, the LED 17 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 18. The LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used. On the other hand, in the resin material that seals the LED chip, a phosphor that emits a predetermined color by being excited by the blue light emitted from the LED chip is dispersed and blended. As a result, white light emission is possible. In addition, as the phosphor, for example, a yellow phosphor that emits yellow light, a green phosphor that emits green light, and a red phosphor that emits red light are used in appropriate combination, or any one of them is used. It can be used alone. The LED 17 is a so-called top surface light emitting type in which a top surface opposite to the mounting surface with respect to the LED substrate 18 (a surface facing the optical member 15) is a light emitting surface, and its optical axis is in the Z-axis direction, That is, they are arranged so as to coincide with the direction orthogonal to the display surface of the liquid crystal panel 11 (the plate surface of the optical member 15). Here, the “optical axis” refers to an axis that coincides with the traveling direction of light having the highest emission intensity among the emitted light from the LED 17.

  As shown in FIGS. 3 and 4, the LED substrate 18 has a base material that is horizontally long when viewed from the front side, and the long side direction (length direction) coincides with the X-axis direction, and is short. In the state where the side direction (width direction) coincides with the Y-axis direction, the chassis 14 is accommodated while extending along the bottom plate 14a. The base material of the LED substrate 18 is made of the same metal as the chassis material such as the chassis 14, and a wiring pattern (not shown) made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer. The outermost surface has a configuration in which a white reflective layer (not shown) is formed. In addition, as a material used for the base material of LED board 18, insulating materials, such as a ceramic, can also be used. The LED 17 having the above-described configuration is surface-mounted on the plate surface facing the front side (the plate surface facing the optical member 15 side) among the plate surfaces of the base material of the LED substrate 18, and this is the mounting surface 18a. It is said. A plurality of the LEDs 17 are arranged in a straight line in parallel along the long side direction (X-axis direction) of the LED substrate 18 and are connected in series by a wiring pattern formed on the LED substrate 18. The arrangement pitch of the LEDs 17 is substantially constant, that is, it can be said that the LEDs 17 are arranged at equal intervals in the X-axis direction (row direction). Connector portions (substrate connection portions) 18c connected to the end portions of the wiring pattern are provided at both ends of the LED substrate 18 in the long side direction. The LED board 18 is formed with an insertion hole 18b through the board holding member 20 at a predetermined position.

  As shown in FIG. 3, the LED substrate 18 having the above-described configuration is arranged in parallel in the chassis 14 in a state where the long side direction and the short side direction are aligned with each other in the X-axis direction and the Y-axis direction. ing. That is, the LED board 18 and the LED 17 mounted thereon are both set in the X-axis direction (the long side direction of the chassis 14 and the LED board 18) in the chassis 14 and in the Y-axis direction (of the chassis 14 and the LED board 18). The short side direction is arranged in a matrix with the column direction (arranged in a matrix, planar arrangement). Specifically, a total of 27 LED substrates 18 are arranged in parallel in the chassis 14, three in the X-axis direction and nine in the Y-axis direction. The three LED boards 18 forming one row by being arranged along the X-axis direction are electrically connected to each other by fitting and connecting adjacent connector portions 18c to each other, and the X in the chassis 14 is also connected. Connector portions 18c corresponding to both ends in the axial direction are connected to an LED drive board (light source drive board) (not shown) disposed outside the rear surface side of the chassis 14 via a wiring member. As a result, the LEDs 17 arranged on each LED board 18 in one row are connected in series, and the lighting / extinction of a large number of LEDs 17 included in that row is collectively controlled by the LED drive board. Can do.

  The diffusing lens 19 is made of a synthetic resin material (for example, polycarbonate or acrylic) that is substantially transparent (having high translucency) and has a refractive index higher than that of air. As shown in FIGS. 3 to 5, the diffusing lens 19 has a predetermined thickness and is formed in a substantially circular shape when viewed from the front side, and covers each LED 17 individually from the front side with respect to the LED substrate 18. That is, they are respectively attached so as to overlap with the respective LEDs 17 when viewed from the front side. The diffusing lens 19 can emit light having strong directivity emitted from the LED 17 while diffusing. That is, the directivity of the light emitted from the LED 17 is relaxed through the diffusing lens 19, so that even if the interval between the adjacent LEDs 17 is wide, the region between them is difficult to be visually recognized as a dark part. Thereby, it is possible to reduce the number of installed LEDs 17. The diffusing lens 19 is disposed at a position substantially concentric with the LED 17 when viewed from the front side.

  Specifically, as shown in FIGS. 6 and 8, the diffusing lens 19 has a diameter dimension that is sufficiently larger than the outer dimension of the LED 17, but is slightly smaller than the short side dimension of the LED substrate 18. Of the diffusing lens 19, the surface facing the back side and facing the LED 17 is a light incident surface 19a on which light from the LED 17 is incident, as shown in FIGS. The surface facing the optical member 15 is a light emitting surface 19b that emits light. Of these, the light incident surface 19a has a planar shape parallel to the plate surface (X-axis direction and Y-axis direction) of the LED substrate 18 as a whole, but is particularly in a region overlapping the LED 17 when viewed in plan. By forming the light incident side concave portion 19 c, the light incident side concave portion 19 c has an inclined surface inclined with respect to the optical axis of the LED 17. The light incident side concave portion 19 c has a substantially conical shape with an inverted V-shaped cross section and is disposed at a substantially central position in the diffusing lens 19. The light emitted from the LED 17 and entering the light incident side concave portion 19 c enters the diffusion lens 19 while being refracted at a wide angle by the inclined surface. From the light incident surface 19a of the diffusing lens 19, a lens support portion (optical element support portion) 19d, which is an attachment structure to the LED substrate 18, is provided so as to protrude toward the back side, and this lens support portion 19d is an LED. It is fixed to the mounting surface 18a of the substrate 18 with an adhesive or the like. The lens support portion 19d has a substantially cylindrical shape with a substantially circular cross section, and is disposed at a position slightly inward of the outer peripheral end position of the diffusion lens 19 (see FIG. 10). Three lens support portions 19d are arranged at positions where the distance from the center position of the diffusing lens 19 is approximately equal, and are intermittently arranged along the circumferential direction of the diffusing lens 19, and their angular intervals are approximately equal. 120 degrees. The lens support portion 19d supports the diffusing lens 19 at a position where the main body portion (a disk-shaped portion having the light incident surface 19a and the light emitting surface 19b) is separated from the front side of the LED substrate 18. The light emission surface 19b is formed in a flat and substantially spherical shape that bulges to the front side, and thereby allows the light emitted from the diffusion lens 19 to be emitted while being refracted at a wide angle. A light emitting side recess 19e having a substantially bowl shape is formed in a region of the light emitting surface 19b that overlaps the LED 17 when viewed from the front side. By this light emitting side recess 19e, most of the light from the LED 17 can be emitted while being refracted at a wide angle, or a part of the light from the LED 17 can be reflected to the LED substrate 18 side.

  The substrate holding member 20 is made of a synthetic resin such as polycarbonate, and has a white surface with excellent light reflectivity. As shown in FIGS. 4 and 5, the substrate holding member 20 is fixed to the chassis 14 by projecting toward the back side, that is, the chassis 14 side from the body portion 20 a along the plate surface of the LED substrate 18. A fixing portion 20b. The main body 20a has a substantially circular plate shape when viewed from the front side, and can hold both the LED board 18 and the reflection sheet 21 described below between the main body 20a and the bottom plate 14a of the chassis 14. The fixing portion 20b can be locked to the bottom plate 14a while penetrating through the insertion hole 18b and the attachment hole 14e respectively formed corresponding to the attachment positions of the substrate holding member 20 on the LED substrate 18 and the bottom plate 14a of the chassis 14. Is done. As shown in FIG. 3, a large number of the substrate holding members 20 are arranged in parallel in the surface of the LED substrate 18, and specifically, the diffusion lenses 19 (LEDs 17) adjacent to each other in the X-axis direction. It is arranged at each position.

  Of the substrate holding member 20, the pair of holding members 20 arranged on the center side of the screen is provided with a support portion 20c protruding from the main body portion 20a to the front side, as shown in FIGS. The support portion 20c can support the diffusion plate 15a from the back side, whereby the positional relationship in the Z-axis direction between the LED 17 and the optical member 15 can be maintained constant and the optical member 15 is not prepared. Can be controlled.

  The reflection sheet 21 is made of a synthetic resin, and the surface thereof is white with excellent light reflectivity. As shown in FIGS. 3 to 5, the reflection sheet 21 has a size that is laid over almost the entire inner surface of the chassis 14, so that the LED boards 18 arranged in the chassis 14 are spread over almost the entire area. It is possible to cover from the front side (light emitting side, optical member 15 side). The reflection sheet 21 can reflect the light in the chassis 14 so as to rise toward the front side (light emission side, optical member 15 side). The reflection sheet 21 extends along the bottom plate 14a and the LED board 18 of the chassis 14 and covers the LED boards 18 at a time so as to cover almost the entire area thereof, and from the outer ends of the bottom parts 21a to the front side. The four rising portions 21b that rise while being inclined with respect to the bottom portion 21a and the extending portions 21c that extend outward from the outer ends of the respective rising portions 21b and are placed on the receiving plate 14d of the chassis 14 are configured. ing. Of these, the bottom portion 21a has a horizontally long rectangular shape as viewed from the front side, like the bottom plate 14a, and the size thereof is slightly smaller than the bottom plate 14a. The rising portion 21b rises from a pair of long-side ends and a pair of short-side ends of the bottom portion 21a, and has a predetermined inclination angle (preferably an inclination angle of 45 degrees or less) with respect to the bottom portion 21a. Have. Therefore, it can be said that the reflective sheet 21 has a substantially bowl shape as a whole. The extending part 21c is in the form of a piece parallel to the bottom part 21a and the receiving plate 14d.

  The bottom portion 21a of the reflection sheet 21 is arranged in such a manner as to straddle the plurality of LED substrates 18 arranged side by side in the plate surface of the bottom plate 14a. Therefore, the bottom portion 21a of the reflection sheet 21 is not overlapped with the LED board 18 and the chassis 14 without overlapping the front plate surface of each LED board 18, that is, the portion that is supported on the front side with respect to the mounting surface 18 a of the LED 17. And a portion having a gap with the bottom plate 14a. The bottom portion 21a of the reflection sheet 21 is arranged in a form interposed between the diffusion lens 19 and the LED substrate 18 in the Z-axis direction (the overlapping direction of the bottom plate 14a and the LED substrate 18). Further, as shown in FIG. 3, the bottom 21a of the reflection sheet 21 is inserted through each diffusion lens 19 (each LED 17) at a position overlapping with each diffusion lens 19 (each LED 17) when viewed from the front side. A hole (insertion hole) 21d is provided open. A plurality of lens insertion holes 21d are arranged in parallel in a matrix form (matrix form) in the X-axis direction and the Y-axis direction corresponding to the arrangement of the LEDs 17. Each lens insertion hole 21d has a planar shape that follows the outer shape of the diffusing lens 19, and has a substantially circular shape when viewed from the front side. In addition, a connector insertion hole (connection portion insertion hole) 21e through which the connector portion 18c is individually inserted is formed in the bottom portion 21a of the reflection sheet 21 at a position overlapping the connector portion 18c of each LED board 18 when viewed from the front side. Is provided. A plurality of connector insertion holes 21e are arranged in parallel along the Y-axis direction at two positions separated in the X-axis direction corresponding to the arrangement of the connector portions 18c. Each connector insertion hole 21e has a planar shape that follows the outer shape of the connector portion 18c, and has a substantially square shape when viewed from the front side. Further, in the bottom portion 21a of the reflection sheet 21, the fixing portion insertion holes through which the fixing portions 20b of the substrate holding members 20 are passed are formed in the same manner as the insertion holes 21d and 21e described above.

  As described above, the lens insertion hole 21d through which the diffusing lens 19 is passed is formed in the bottom 21a of the reflection sheet 21, but if the bottom 21a is deformed so as to bend to the front side, the lens insertion hole There is a concern that the hole edge of 21d is displaced to a position where it covers the light emitting surface 19b of the diffusing lens 19, and the emitted light from the light emitting surface 19b is blocked. Therefore, in the present embodiment, as shown in FIGS. 6 to 9, the diffuser lens 21 has a hole edge of the lens insertion hole 21 d </ b> A arranged in a portion of the bottom 21 a of the reflection sheet 21 that is likely to be deformed. In contrast, the restricting portion 22 that restricts the bottom portion 21a from being displaced to the front side is provided by being arranged at a position that overlaps when viewed from the front side. In addition, at the hole edge of the lens insertion hole 21 d having the restricting portion 22, the lens is arranged such that the restricting portion 22 is displaced to a position where the restricting portion 22 does not overlap with the diffuser lens 21 when viewed from the front side. An expansion allowing portion 23 for expanding the insertion hole 21d is provided. In the following description, when the lens insertion hole 21d including the restricting portion 22 and the enlargement allowing portion 23 is particularly shown, the subscript A is attached to the reference numeral 21d. By restricting the bottom portion 21a of the reflection sheet 21 from being displaced to the front side by the restricting portion 22, a situation in which the hole edge of the lens insertion hole 21dA covers the light emitting surface 19b of the diffusing lens 19 is avoided. The outgoing light from the outgoing surface 19b is prevented from being blocked and the occurrence of uneven brightness is prevented. On the other hand, the lens insertion hole 21dA can be expanded so that the restricting portion 22 is displaced to a position where the restricting portion 22 does not overlap the diffusing lens 21 when viewed from the front side. Assembling work can be performed in the procedure of laying the reflection sheet 21 with the lens 19 installed, thereby improving work efficiency and productivity. Hereinafter, specific configurations and arrangements of the restricting portion 22 and the expansion allowing portion 23 will be described in detail.

  As shown in FIGS. 6 and 8, the lens insertion hole 21 d that does not include the restricting portion 22 and the expansion allowance portion 23 is set to have a diameter larger than the diameter of the diffusion lens 19, thereby the diffusion lens. 19, the operation of laying the bottom 21a of the reflection sheet 21 from the front side can be easily performed. On the other hand, as shown in FIG. 10, the lens insertion hole 21 d </ b> A provided with the restricting portion 22 and the expansion allowing portion 23 is set to have a diameter smaller than the diameter of the diffusing lens 19. Specifically, the hole diameter of the lens insertion hole 21 dA is set to a size that surrounds the three lens support portions 19 d in the diffusion lens 19. The restricting portion 22 is configured by a portion of the hole edge of the lens insertion hole 21dA that overlaps the diffusing lens 19 (specifically, the outer peripheral edge of the diffusing lens 19) when viewed from the front side, and viewed from the front side. It has a substantially annular shape over the entire circumference of the lens insertion hole 21dA. As shown in FIG. 7 and FIG. 9, the restricting portion 22 is disposed on the back side so as to face the light incident surface 19 a of the diffusion lens 19, and is between the diffusion lens 19 and the LED substrate 18 in the Z-axis direction. It is arranged in an intervening form. Therefore, even when the bottom portion 21a of the reflection sheet 21 is deformed and is displaced to the front side, the regulating portion 22 having a substantially annular shape is displaced to the front side by interfering with the light incident surface 19a of the diffusion lens 19. Can be regulated. As a result, a situation in which the hole edge of the lens insertion hole 21dA covers the light exit surface 19b of the diffusion lens 19 is avoided.

  As shown in FIG. 10, the expansion allowing portion 23 is configured by a slit 24 formed at the hole edge of the lens insertion hole 21 dA. The slit 24 has a linear shape extending from the center of the lens insertion hole 21dA along the radial direction when viewed from the front side, and has one end opened toward the lens insertion hole 21dA and the other end closed. It is said that. A pair of slits 24 having substantially the same length are arranged at positions at an angular interval of about 180 degrees at the hole edge of the lens insertion hole 21dA, and are positioned on the same straight line passing through the center of the lens insertion hole 21dA. ing. Therefore, it can be said that the hole edge (regulating portion 22) of the lens insertion hole 21dA is substantially equally divided by the pair of slits 24. Specifically, the hole edge (regulating portion 22) of the lens insertion hole 21dA has a substantially annular shape (substantially donut shape) as a whole when viewed from the front side, but a pair of substantially semicircular rings by the pair of slits 24. It is divided into parts. Since the pair of slits 24 are both linear along the X-axis direction, they can be expanded along the Y-axis direction. When these slits 24 are expanded, the lens insertion hole 21dA is also expanded, so that the diameter dimension becomes larger than the original size and the diameter dimension of the diffusion lens 19 becomes larger. In FIG. 10, a state where the slit 24 and the lens insertion hole 21dA are expanded is shown by a two-dot chain line. In this state, the restricting portion 22 formed by the hole edge of the lens insertion hole 21dA is disposed at a position that does not overlap the diffusing lens 19 when viewed from the front side. When the work of laying 21a from the front side is performed, the interference of the restricting portion 22 to the diffusing lens 19 is avoided, and the work can be easily performed. On the other hand, in the state where the slit 24 is closed, as described above, the hole edge (the restricting portion 22) of the lens insertion hole 21dA has a substantially annular shape and does not have an opening portion in the middle in the circumferential direction. Is done.

  Next, arrangement | positioning of the control part 22 and the expansion allowance part 23 in the bottom part 21a of the reflective sheet 21 is demonstrated. As shown in FIGS. 6 and 7, the restriction portion 22 and the expansion allowance portion 23 are arranged at the corner positions of the four corners of the bottom portion 21 a among the lens insertion holes 21 d that are arranged in a plurality of rows in a matrix at the bottom portion 21 a. Each lens insertion hole 21dA is provided. The lens insertion holes 21dA disposed at the corners of the four corners are disposed at positions farthest from the center of the bottom 21a among the lens insertion holes 21d, and thus the LED substrate 18, the chassis 14, the reflection sheet 21, and the like. Due to the effects of dimensional errors, assembly errors, etc., the position of the diffuser lens 19 tends to be misaligned in the direction along the surface of the bottom 21a (X-axis direction and Y-axis direction). For this reason, the hole edge of each lens insertion hole 21dA arranged at the corners of the four corners is easily displaced to the front side with respect to the diffusion lens 19, and other lens insertion holes may block light from the light exit surface 19b. It was higher than 21d. In that respect, as described above, the hole edges of the lens insertion holes 21dA arranged at the corner positions of the four corners are used as the restricting portions 22 that overlap the diffuser lenses 19 to restrict the displacement of the hole edges to the front side. Therefore, the deformation of the bottom 21a and the occurrence of luminance unevenness can be suppressed, and the ease of assembling work is ensured by the expansion allowing portion 23.

  In addition, as shown in FIGS. 6 and 7, the lens insertion holes 21dA arranged at the corner positions of the four corners are adjacent to the two rising portions 21b on the short side and the long side of the reflection sheet 21, respectively. Since they are arranged at the matching positions, residual stress associated with the rising portion 21b rising from the bottom portion 21a tends to act on the hole edge, and as a result, the hole edge is easily displaced to the front side. However, as described above, the displacement is well regulated by the restricting portion 22, and the ease of assembling work is ensured by the expansion allowing portion 23. Furthermore, the lens insertion holes 21dA arranged at the corners of the four corners are not supported by positions adjacent to the ends of the LED substrate 18 in the long side direction, that is, portions supported by the LED substrate 18 in the bottom 21a. Since it is arranged at a position closest to the boundary with the portion, it is easily affected by steps and irregularities that may occur between the chassis 14, the LED substrate 18, and the reflection sheet 21, and thereby each lens insertion hole 21 dA. However, as described above, the displacement is well regulated by the restricting portion 22, and the ease of assembling work is ensured by the expansion permitting portion 23.

  In addition to the lens insertion holes 21dA arranged at the corners of the four corners described above, the restriction portion 22 and the expansion allowance portion 23 are connector portions of the LED boards 18 in the bottom portion 21a as shown in FIGS. Each lens insertion hole 21dA arranged at a position adjacent to each connector insertion hole 21e through which 18c passes is also provided. In the present embodiment, the restricting portion 22 and the expansion allowance portion 23 are respectively provided in all the lens insertion holes 21dA arranged at positions adjacent to the connector insertion holes 21e. In the vicinity of each connector insertion hole 21e, it is difficult to install a structure such as the substrate holding member 20 that can sandwich the bottom 21a with the chassis 14 and restrict displacement of the bottom 21a in the Z-axis direction. 21a is easily deformed so as to be displaced to the front side, but the restriction portion 22 is provided at the hole edge of the lens insertion hole 21dA arranged at a position adjacent to the connector insertion hole 21e, so that the bottom 21a Deformation can be well controlled, and the ease of assembly work is ensured by the expansion allowance portion 23. Since the connector portion 18c passed through the connector insertion hole 21e is disposed at the end of the LED board 18, each lens insertion hole 21dA disposed at a position adjacent to each connector insertion hole 21e It will be arranged at a position adjacent to the end of 18. Each lens insertion hole 21dA disposed at a position adjacent to each connector insertion hole 21e includes one disposed at a position adjacent to the rising portion 21b on the long side of the reflection sheet 21.

  This embodiment has the structure as described above, and the operation thereof will be described subsequently. In order to manufacture the liquid crystal display device 10, the separately manufactured liquid crystal panel 11, backlight device 12, bezel 13 and the like are assembled. Hereinafter, the manufacturing procedure of the backlight device 12 will be described mainly with respect to the manufacturing procedure of the liquid crystal display device 10.

  Prior to assembling the backlight device 12, after the LEDs 17 are mounted on the LED substrate 18, the diffusion lenses 19 are attached so as to individually cover the LEDs 17 from the front side. The process of mounting the LED 17 and the diffusing lens 19 on the LED substrate 18 is efficiently performed by an automatic machine. As described above, the LED substrate 18 is used for assembling the backlight device 12 in a state where the LED 17 and the diffusion lens 19 are assembled in advance. When the backlight device 12 is assembled, each LED board 18 is accommodated in the chassis 14 from the front side and disposed at a predetermined position in the plate surface of the bottom plate 14a. When all the LED boards 18 are accommodated in the chassis 14, the work of laying (assembling) the reflection sheet 21 is performed.

  When laying the reflection sheet 21, among the lens insertion holes 21 d formed in the bottom 21 a, the lens insertion hole 21 d </ b> A including the restriction portion 22 and the expansion allowance portion 23 is formed by the slit 24 that is the expansion allowance portion 23. Can be expanded. Specifically, when the bottom portion 21a is placed on each LED board 18, the lens insertion holes 21d that do not include the restriction portion 22 and the enlargement allowance portion 23 are inserted through the diffusion lenses 19, but the restriction portions 22 and About each lens insertion hole 21dA provided with the expansion allowance part 23, the hole edge (regulation part 22) covers each diffusion lens 19 from the front side. In this state, by pulling the periphery of each lens insertion hole 21dA in the bottom portion 21a so as to open each slit 24, that is, away from the center of each lens insertion hole 21dA along the Y-axis direction, As shown by the two-dot chain line 10, the slits 24 can be expanded to separate the opposing end surfaces, and the lens insertion holes 21 dA can be expanded accordingly. At this time, each lens insertion hole 21dA is expanded until the diameter dimension thereof becomes larger than the diameter dimension of each diffusion lens 19, so that each regulation portion 22 is not superimposed on the diffusion lens 19 when viewed from the front side. To the position. Accordingly, it is allowed to pass each diffusing lens 19 through each lens insertion hole 21dA. Then, as shown in FIGS. 7 and 9, the bottom 21 a can reach the back side of each diffusing lens 19 over the entire region, and can be superimposed on the mounting surface 18 a of each LED substrate 18.

  Here, it is assumed that the LED board 18 on which the LED 17 and the diffusion lens 19 are not mounted is assembled in the chassis 14, and the LED 17 and the diffusion lens 19 are mounted on the LED board 18 with the reflection sheet 21 laid there. When the work is performed, since the automatic machine cannot be used for the mounting work of the LED 17 and the diffusion lens 19, work efficiency and productivity are remarkably deteriorated. Compared to this, as described above, in the present embodiment, after the LED board 18 on which the LED 17 and the diffusing lens 19 are mounted in advance using an automatic machine is assembled to the chassis 14, the reflective sheet 21 is laid. Since the work is enabled, an effect of improving work efficiency and productivity can be obtained.

  When the operation of laying the reflection sheet 21 is finished, the board holding member 20 is subsequently attached to hold the LED boards 18 and the reflection sheet 21 in the attached state with respect to the chassis 14. Thereafter, the optical members 15 are stacked and arranged so as to cover the light emitting portion 14b of the chassis 14, and then the frame 16 is attached to hold the optical member 15, and the front-side components of the backlight device 12 Assembly is complete. Then, by assembling the liquid crystal panel 11 and the bezel 13, the assembling of the liquid crystal display device 10 is completed as shown in FIGS.

  When the liquid crystal display device 10 including the backlight 12 manufactured as described above is used, each LED 17 is turned on and an image signal is supplied to the liquid crystal panel 11, thereby the liquid crystal panel 11. A predetermined image is displayed on the display surface. As shown in FIGS. 7 and 9, the light emitted as each LED 17 is turned on first enters the light incident surface 19 a of the diffusion lens 19. At this time, most of the light is incident on the inclined surface of the light incident side recess 19c in the light incident surface 19a, so that the light enters the diffusing lens 19 while being refracted at a wide angle according to the inclination angle. The incident light propagates through the diffusing lens 19 and then exits from the light exit surface 19b. Since the light exit surface 19b has a flat, substantially spherical shape, an external air layer is formed. Light is emitted while being refracted at a wider angle at the interface. In addition, in the light emitting surface 19b, in the region where the amount of light from the LED 17 is the largest, a light emitting side concave portion 19e having a substantially bowl shape is formed, and the peripheral surface has a flat and substantially spherical shape. Light can be emitted while being refracted at a wide angle on the peripheral surface of the light emitting side recess 19e, or reflected to the LED substrate 18 side. Among these, the light returned to the LED substrate 18 side is effectively utilized by being reflected on the diffusion lens 19 side by the reflection layer formed on the surface of the LED substrate 18 and entering the diffusion lens 19 again. High brightness can be obtained. In particular, with respect to each lens insertion hole 21dA provided with the restricting portion 22 and the expansion allowing portion 23, the restricting portion 22 that is the hole edge is arranged on the back side opposite to the diffusing lens 19, but this Since the restricting portion 22 has a substantially annular shape and is arranged without having an opening portion in the middle of the entire circumference, it can reflect light from the diffusion lens 19 side more efficiently and rise to the front side. Therefore, higher luminance can be obtained.

  By the way, when the LED 17 is turned on as the liquid crystal display device 10 is used, heat is generated from the LED 17, so that the temperature inside the backlight device 12 rises and the use of the liquid crystal display device 10 is stopped. When the light is turned off, the temperature inside the backlight device 12 decreases. As described above, when the temperature environment inside the backlight device 12 changes, it is assumed that thermal expansion and thermal contraction can occur in the members disposed inside the backlight device 12 accordingly. In particular, as shown in FIGS. 6 and 8, the bottom portion 21 a of the reflection sheet 21 has a portion that is close to the LED 17 and a portion that is far from the LED 17, and the former is hotter than the latter. The amount of expansion and contraction accompanying expansion and thermal contraction is relatively large. Due to the difference in the amount of expansion and contraction, deformation such as warping and bending is likely to occur in the hole edge of the lens insertion hole 21d, which is a portion of the bottom 21a that is close to the LED 17. Of the lens insertion holes 21d arranged in a matrix at the bottom 21a, the lens insertion holes 21dA arranged particularly at the corners of the bottom 21a are adjacent to the rising parts 21b as shown in FIGS. In combination with being arranged at a position adjacent to the end of the LED substrate, the hole edge is easily deformed. In this regard, in the present embodiment, since the restricting portion 22 is selectively provided in the lens insertion hole 21dA where the occurrence of deformation is a concern, even when the hole edge is about to be displaced to the front side, the restricting portion 22 is provided. Is caught on the diffusing lens 19, and further displacement is restricted. This prevents a situation in which the hole edge of the lens insertion hole 21dA reaches the front side of the diffusing lens 19 and covers the light emitting surface 19a, thereby blocking the light from the light emitting surface 19a. In addition to being prevented, it is possible to prevent uneven brightness from occurring in the light emitted from the backlight device 12. In addition to the lens insertion hole 21dA arranged at the corner position of the bottom portion 21a, the restricting portion 22 has a lens insertion hole 21dA arranged at a position adjacent to the connector insertion hole 21e as shown in FIGS. Accordingly, it is possible to prevent the unevenness of the luminance by restricting the hole edge of the lens insertion hole 21dA in the non-arranged portion of the bottom portion 21a from being displaced to the front side.

  As described above, the backlight device (illumination device) 12 of the present embodiment is arranged so as to cover the LED (light source) 17 and the LED 17 from the light emitting side, and imparts an optical action to the light from the LED 17. A diffusion lens (optical element) 19 that emits the light, a chassis 14 having a bottom plate 14a disposed on the opposite side of the light emission side with respect to the LED 17, a bottom plate 14a of the chassis 14 and the diffusion lens 19 A reflection sheet (reflective member) 21 that is arranged in an intervening manner and extends along the plate surface of the bottom plate 14a to reflect light, and a lens insertion hole (insertion hole) through which the diffusion lens 19 passes. The reflection sheet 21 having 21d and at least a part of the hole edge of the lens insertion hole 21dA in the reflection sheet 21 are superimposed on the diffusion lens 19 when viewed from the light emitting side. By being disposed at the position, a restriction portion 22 that can restrict the reflection sheet 21 from being displaced to the light emitting side, and a hole edge of the lens insertion hole 21dA in the reflection sheet 21 are provided. In contrast, an expansion permitting portion 23 that expands the lens insertion hole 21dA so as to be displaced to a non-overlapping position when viewed from the light emitting side is provided.

  In this way, when the LED 17 is turned on, the light from the LED 17 is emitted after being given an optical action by the diffusion lens 19 arranged so as to cover the LED 17 from the light emitting side. The light existing in the backlight device 12 is reflected by the reflection sheet 21 that is arranged between the bottom plate 14a of the chassis 14 and the diffusion lens 19 and extends along the plate surface of the bottom plate 14a. In this way, the light is launched to the light emitting side, and is thereby effectively used as the emitted light of the backlight device 12.

  By the way, when the reflection sheet 21 is deformed such as warping or bending, and the reflection sheet 21 is displaced toward the light emitting side with respect to the diffusion lens 19, the light from the diffusion lens 19 may be blocked by the reflection sheet 21. Concerned. In this regard, in the present embodiment, the restricting portion 22 configured by at least a part of the hole edge of the lens insertion hole 21dA in the reflection sheet 21 is disposed at a position overlapping the diffusing lens 19 when viewed from the light emitting side. This restricts the reflection sheet 21 from being displaced toward the light emitting side. Thereby, it is possible to prevent the light from the diffusing lens 19 from being blocked by the reflection sheet 21, so that the light emitted from the backlight device 12 is less likely to be uneven.

  Here, when the restricting portion 22 is provided at a position overlapping the diffusing lens 19 when viewed from the light emitting side as described above, the diffusing lens 19 is already installed when the backlight device 12 is assembled. There is a concern that it is difficult to perform the operation in the procedure of assembling the reflection sheet 21 from the light emitting side of the diffusion lens 19. In this regard, in the present embodiment, since the enlargement allowance portion 23 is provided at the hole edge of the lens insertion hole 21dA in the reflection sheet 21, the lens insertion hole 21dA is assembled by the enlargement allowance portion 23 when the reflection sheet 21 is assembled. Is expanded to a position where the restricting portion 22 is non-overlapped with respect to the diffusing lens 19 when viewed from the light emitting side. Thereby, the operation | work which assembles | attaches the reflective sheet 21 with respect to the existing diffused lens 19 from the light emission side can be performed easily. According to the present embodiment, it is possible to regulate the deformation of the reflection sheet 21 while ensuring the ease of assembly work.

  In addition, a plurality of LEDs 17 are mounted and a plurality of diffusion lenses 19 are attached so as to individually cover the plurality of LEDs 17, and an LED substrate 18 disposed on the light emitting side with respect to the bottom plate 14 a of the chassis 14 is provided. The reflection sheet 21 is disposed so as to be interposed between the diffusion lens 19 and the LED substrate 18 and has a plurality of lens insertion holes 21 d through which the plurality of diffusion lenses 19 are individually passed. In this way, even when the reflection sheet 21 is assembled from the light emitting side to the LED substrate 18 on which the plurality of LEDs 17 are mounted and the plurality of diffusion lenses 19 are attached, the expansion permitting portion 23 can also be used. By enlarging the lens insertion hole 21dA, the restricting portion 22 is displaced to a position where it does not overlap with the diffusing lens 19 when viewed from the light exit side, so that the assembly work of the reflection sheet 21 can be easily performed. it can. Thereby, since LED17 and the diffusion lens 19 can be assembled | attached previously to the LED board 18, it becomes a thing with high productivity and is advantageous in terms of cost.

  The LED boards 18 are arranged in a state in which a plurality of LED boards 18 are arranged in the plate surface of the bottom plate 14 a of the chassis 14, and the reflection sheet 21 extends along the plate surface of the bottom plate 14 a and the plurality of LED boards 18. It has the bottom part 21a distribute | arranged in the form straddling. In this way, after assembling the plurality of LED boards 18 in a state where they are aligned in the plate surface of the bottom plate 14a of the chassis 14, the LED boards 18 extend along the bottom plate 14a and are arranged so as to straddle the plurality of LED boards 18. The reflective sheet 21 having the bottom 21a can be easily assembled to each LED board 18 from the light emitting side. Since the LED 17 and the diffusing lens 19 can be assembled in advance on the plurality of LED substrates 18 respectively, the productivity is higher and the cost is more advantageous.

  In addition, a plurality of lens insertion holes 21d are arranged in a matrix on the bottom 21a of the reflection sheet 21, and are arranged at least at the corners of the bottom 21a among the plurality of lens insertion holes 21d. The lens insertion hole 21dA has at least a part of the hole edge as the restricting portion 22 and is provided with a widening allowance portion 23 at the hole edge. The lens insertion hole 21dA arranged at the angular position of the bottom 21a of the reflection sheet 21 is positioned relative to the diffusing lens 19 due to the influence of dimensional errors, assembly errors, and the like, compared to the lens insertion hole 21d arranged on the center side. The hole edge tends to shift, and as a result, the hole edge is easily displaced toward the light emitting side with respect to the diffusion lens 19. In this regard, as described above, among the lens insertion holes 21d, the lens insertion hole 21dA disposed at least at the corner position of the bottom 21a has at least a part of the hole edge as the restricting portion 22 and expands to the hole edge. If the opening allowance portion 23 is provided, the restriction portion 22 can restrict the displacement of the hole edge of the lens insertion hole 21dA with respect to the diffusing lens 19, and the enlargement allowance portion 23 is sufficient for ease of assembly work. Can be secured.

  The reflection sheet 21 has a rising portion 21b that rises from the end of the bottom portion 21a toward the light emission side, and is a lens that is disposed at least at a position adjacent to the rising portion 21b among the plurality of lens insertion holes 21d. As for insertion hole 21dA, at least one part of the hole edge is made into the control part 22, and the expansion allowance part 23 is provided in the hole edge. In this way, the rising portion 21b from the end portion of the bottom portion 21a toward the light emitting side can reflect the light existing in the backlight device 12 while angling the light according to the rising angle from the bottom portion 21a. it can. Residual stress accompanying the rising of the rising portion 21b from the bottom portion 21a tends to act on the hole edge of the lens insertion hole 21dA arranged at a position adjacent to the rising portion 21b, and deformation is likely to occur. However, as described above, if the lens insertion hole 21dA has at least a part of the hole edge as the restricting portion 22 and the opening allowance portion 23 is provided at the hole edge, the restricting portion 22 causes the diffusion lens 19 to be provided. The displacement of the hole edge of the lens insertion hole 21dA can be restricted, and the ease of assembly work can be sufficiently secured by the widening allowance portion 23.

  In addition, the lens insertion hole 21dA disposed at a position adjacent to at least the end portion of the LED substrate 18 among the plurality of lens insertion holes 21d has at least a part of the hole edge as the restricting portion 22 and at the hole edge. An expansion permitting portion 23 is provided. Since the bottom portion 21a of the reflection sheet 21 is arranged so as to straddle the plurality of LED substrates 18, steps or irregularities are likely to occur near the end portions of the LED substrate 18 due to dimensional errors or assembly errors. Therefore, although it is easy for deformation to occur in the hole edge of the lens insertion hole 21dA arranged at a position adjacent to the end of the LED substrate 18, as described above, at least the hole edge of the lens insertion hole 21dA If a part is used as the restricting portion 22 and the opening allowance portion 23 is provided at the hole edge, the restricting portion 22 can restrict the displacement of the hole edge of the lens insertion hole 21dA with respect to the diffusion lens 19 and expand the hole. The ease of assembly work can be sufficiently secured by the opening allowance portion 23.

  The plurality of LED boards 18 are arranged adjacent to each other in the plate surface of the bottom plate 14a of the chassis 14 and have connector parts (board connection parts) 18c that electrically connect each other. The bottom portion 21a of the reflection sheet 21 is provided with a connector insertion hole 21e through which the connector portion 18c is passed, and the lens insertion is arranged at least in a position adjacent to the connector insertion hole 21e among the plurality of lens insertion holes 21d. The hole 21dA has at least a part of the hole edge as the restricting portion 22 and is provided with an expansion allowing portion 23 at the hole edge. In the vicinity of the connector insertion hole 21e through which the connector portion 18c passes, although it is difficult to install another structure that restricts deformation of the bottom portion 21a of the reflection sheet 21 due to the arrangement of the connector portion 18c, the above-mentioned As for the lens insertion hole 21dA arranged at least at a position adjacent to the connector insertion hole 21e among the plurality of lens insertion holes 21d, at least a part of the hole edge is used as the restricting portion 22 and the hole edge is allowed to expand. If the portion 23 is provided, the restricting portion 22 can restrict the displacement of the hole edge of the lens insertion hole 21dA with respect to the diffusing lens 19, and the widening allowance portion 23 sufficiently guarantees the ease of assembly work. can do.

  Further, between the diffusion lens 19 and the LED substrate 18, a lens support portion 19 d that supports the diffusion lens 19 at a position away from the mounting surface of the LED 17 on the LED substrate 18 toward the light emitting side is provided in the circumferential direction of the diffusion lens 19. The lens insertion hole 21dA has a hole diameter that surrounds the lens support portion 19d. In this way, the lens support portion 19d can support the diffusing lens 19 at a position away from the LED 17 mounting surface on the LED substrate 18 toward the light emitting side, thereby sufficiently enhancing the optical function of the diffusing lens 19. It can be demonstrated. Since the lens insertion hole 21dA has a hole diameter that surrounds the lens support portion 19d, the lens insertion hole 21dA can be easily formed in the lens support portion 19d when the reflection sheet 21 is assembled to the diffusing lens 19 from the light emitting side. Can be passed through.

  Moreover, the expansion allowance part 23 is comprised by the slit 24 formed in the hole edge of 21 dA of lens penetration holes. In this way, when the reflection sheet 21 is assembled to the diffusing lens 19 from the light emitting side, the slit 24 is widened so that the lens insertion hole 21dA is widened and the restricting portion 22 is the diffusing lens. 19 is displaced to a non-overlapping position when viewed from the light emitting side, and assembly is allowed. Since the slit 24 can be closed after the assembly, the area of the reflection sheet 21 is smaller than when the enlargement allowance portion 23 is provided by forming a partial opening at the edge of the lens insertion hole 21dA. Can be ensured greatly, and the formation range of the restricting portion 22 can also be increased. As a result, more light can be reflected by the reflection sheet 21 to improve the light use efficiency, and the deformation preventing function of the reflection sheet 21 by the restricting portion 22 can be improved.

  Further, the restricting portion 22 is disposed over the entire circumference of the hole edge of the lens insertion hole 21dA. In this way, it is possible to more reliably restrict the reflection sheet 21 from being displaced toward the light exit side with respect to the diffusing lens 19 by the restricting portion 22 disposed over the entire circumference of the hole edge of the lens insertion hole 21dA. it can.

  In addition, the slits 24 are arranged so that a pair is positioned on a straight line at the hole edge of the lens insertion hole 21dA. In this way, the lens insertion hole 21dA can be easily expanded, and the workability is excellent.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In this Embodiment 2, what changed the shape of 121 dA of lens penetration holes is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 11, the lens insertion hole 121dA according to this embodiment has a substantially oval shape (substantially elliptical shape) as viewed from the front side. Specifically, in the lens insertion hole 121dA, the long side direction (long axis direction) coincides with the Y axis direction, and the short side direction (short axis direction) coincides with the X axis direction. Is larger than the diameter dimension of the diffusion lens 119, whereas the short side dimension (short axis dimension) is smaller than the diameter dimension of the diffusion lens 119. Accordingly, both the long side edges of the hole of the lens insertion hole 121dA are a pair of restricting portions 122 that overlap with the diffusing lens 119 when viewed from the front side. On the other hand, among the hole edges of the lens insertion hole 121dA, between the hole edges on the short side and the diffusing lens 119, openings 25 are respectively formed as viewed from the front side. The opening 25 constitutes an expansion allowing portion 123 that allows the lens insertion hole 121dA to expand. The lens insertion hole 121dA is displaced in a direction in which both hole edges on the short side approach the center of the lens insertion hole 121dA when the hole edge is pulled in a direction away from the center along the short side direction (X-axis direction). At the same time, both edge edges on the long side are displaced away from the center of the lens insertion hole 121dA. In other words, the lens insertion hole 121dA, which is originally a vertically long substantially oval shape, is deformed into a substantially circular shape similar to the diffusion lens 119 by pulling the edge of the hole. At this time, the opening 25 constituting the enlargement allowing portion 123 has a small opening area, whereas the restricting portion 122 has a small overlapping area with the diffusion lens 119. Then, when the restricting portion 122 reaches the outside of the diffusing lens 119 and is not superposed when viewed from the front side, the lens insertion hole 121dA can be smoothly passed through the diffusing lens 119, so that the bottom portion 121a of the reflecting sheet 121 is passed through. Can be assembled easily. In FIG. 11, a state where the lens insertion hole 121dA is expanded is shown by a two-dot chain line.

  As described above, according to the present embodiment, the enlargement allowing portion 123 is configured by the opening 25 that is partially formed at the hole edge of the lens insertion hole 121dA. In this way, when the reflection sheet 121 is assembled to the diffusing lens 119 from the light emitting side, the lens insertion hole 121dA is expanded by the opening 25 partially formed at the hole edge of the lens insertion hole 121dA. Accordingly, the restricting portion 122 is displaced to a position where the diffusing lens 119 is non-superimposed when viewed from the light emitting side, and the assembly is permitted. As compared with the case where the enlargement allowing portion 123 is provided by forming a slit at the hole edge of the lens insertion hole 121dA, the lens insertion hole 121dA is cut when the lens insertion hole 121dA is expanded. It becomes difficult.

  The diffuser lens 119 has a substantially circular shape when viewed from the light exit side, whereas the lens insertion hole 121dA has a substantially oval shape when viewed from the light exit side, and the long side dimension thereof is the radial dimension of the diffuser lens 119. In contrast, the short side dimension is smaller than the diameter dimension of the diffusion lens 119, and the hole edge on the long side of the hole edge of the lens insertion hole 121dA is viewed from the light emitting side. The opening 25 is formed between the hole edge on the short side of the hole edge of the lens insertion hole 121dA and the diffusing lens 119 when viewed from the light emitting side. The expansion allowance portion 123 is configured. In this way, when the reflection sheet 121 is assembled to the diffusion lens 119 from the light emitting side, it is formed between the hole edge on the short side of the hole edge of the lens insertion hole 121dA and the diffusion lens 119. Since the lens insertion hole 121dA having a substantially oval shape is allowed to expand along the short side direction by the expansion permitting portion 123 configured by the opening 25, the hole edge on the long side is accordingly accompanied. The restricting portion 122 configured by the above is displaced to a position where the diffusing lens 119 is non-superimposed when viewed from the light emitting side, and assembly is allowed.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. In this Embodiment 3, what changed the installation number and arrangement | positioning of the slit 224 from above-mentioned Embodiment 1 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 12, the slit 224 constituting the enlargement allowing portion 223 according to the present embodiment has a linear shape extending from the center of the lens insertion hole 221dA along the radial direction when viewed from the front side, and the lens. Three are provided along the circumferential direction at the hole edge of the insertion hole 221dA. The three slits 224 are arranged intermittently side by side at positions spaced equiangularly, specifically about 120 degrees at the hole edge of the lens insertion hole 221dA. Therefore, it can be said that the hole edge (regulating portion 222) of the lens insertion hole 221dA is substantially equally divided into three by the three slits 224. Specifically, the hole edge (regulating portion 222) of the lens insertion hole 221dA has a substantially annular shape (substantially donut shape) as a whole when viewed from the front side, but the three slits 224 have three substantially fan-shaped shapes. It is divided into one piece 26. Each piece portion 26 has a cantilever shape, and can be elastically deformed with the back end position of the slit 224 as the base end portion. Therefore, when laying the reflective sheet 221, after allowing the free end of each piece 26 to ride on the front side with respect to the diffusing lens 219, each piece 26 is deformed while expanding each slit 224, The lens insertion hole 221dA can be expanded to allow the restricting portion 222 to reach the back side of the diffusion lens 219.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. In this Embodiment 4, what changed further the installation number and arrangement | positioning of the slit 324 from above-mentioned Embodiment 3 is shown. In addition, the overlapping description about the same structure, effect | action, and effect as above-mentioned Embodiment 3 is abbreviate | omitted.

  As shown in FIG. 13, the slit 324 constituting the enlargement allowing portion 323 according to the present embodiment forms a straight line extending from the center of the lens insertion hole 321 dA along the radial direction when viewed from the front side, and the lens. Four holes are provided side by side along the circumferential direction of the hole edge of the insertion hole 321dA. The four slits 324 are intermittently arranged at positions at equal angular intervals, specifically about 90 degrees at the hole edge of the lens insertion hole 321dA. Therefore, it can be said that the hole edge (regulating portion 322) of the lens insertion hole 321dA is divided into four substantially evenly by the four slits 324. Specifically, the hole edge (regulating portion 322) of the lens insertion hole 321dA has a substantially annular shape (substantially donut shape) as a whole when viewed from the front side, but the four slits 324 form four substantially fan-like shapes. It is divided into one part 326.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the configuration of the LED substrate 418 is changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 14, the LED boards 418 according to the present embodiment are arranged in a pair of left and right in the long side direction (X-axis direction) of the chassis 414. Specifically, two LED substrates 418 are arranged in parallel in a matrix in the chassis 414, two in the X-axis direction (row direction) and ten in the Y-axis direction (column direction). ing. Each LED board 418 is configured such that a connector portion 418c is provided only at one end portion of both end portions in the long side direction. The connector portion 418c is located at each end portion on the opposite side to the adjacent end portions of the pair of LED substrates 418 arranged along the X-axis direction, that is, at each end portion located at both ends in the long side direction of the chassis 414. It is arranged. A wiring member (not shown) is individually connected to each connector portion 418c of the pair of LED boards 418 arranged along the X-axis direction, so that each LED board 418 is connected to each LED board 418 by an external LED driving board. It is possible to control the drive.

  As shown in FIG. 15, the LED and the diffusion are disposed at the adjacent end portions (end portions located on the center side in the long side direction of the chassis 414) of the pair of LED substrates 418 arranged along the X-axis direction. A lens 419 is mounted. Then, in the bottom edge 421a of the reflection sheet 421, the restricting portion 422 and the enlarged portion are formed at the hole edge of the lens insertion hole 421dA through which the diffusion lens 419 is disposed at the end opposite to the connector portion 418c side of the LED substrate 418. An opening allowance portion 423 (slit 424) is provided. In the vicinity of the end portion of the LED substrate 418, it is difficult to install a structure that restricts deformation of the bottom portion 421a, such as the substrate holding member 420, regardless of the presence or absence of the connector portion 418c. Therefore, the lens insertion hole 421dA located there By disposing the restricting portion 422 and the expansion allowance portion 423 at the hole edge, it is possible to ensure workability related to the assembly of the reflection sheet 421 while favorably restricting deformation of the bottom portion 421a.

<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) In addition to the above-described embodiments, the arrangement of the lens insertion holes including the restricting portion and the expansion allowance portion in the plane of the bottom portion of the reflection sheet can be changed as appropriate. For example, a restricting portion and a widening allowance portion are installed in all of the lens insertion holes adjacent to the end portion of the LED substrate, or a lens insertion hole adjacent to each rising portion of the reflection sheet (disposed on the outer peripheral end side of the bottom portion). It is also possible to install a restricting portion and an enlargement allowing portion in all of the lens insertion holes. In addition, when the restricting portion and the expansion allowance portion are installed in a part of the lens insertion hole adjacent to the end portion of the LED substrate, the arrangement thereof can be changed. Similarly, when the restricting portion and the expansion allowance portion are installed in a part of the lens insertion hole adjacent to each rising portion of the reflection sheet, the arrangement thereof can be changed.

  (2) In addition to the above (1), for example, a restricting portion and an expansion permitting portion are installed only at a part of the lens insertion hole adjacent to the connector insertion hole at the bottom of the reflection sheet, or arranged at the corner of the bottom. It is also possible to install the restricting portion and the enlargement allowing portion only in a part of the lens insertion hole.

  (3) In addition to the above (1) and (2), for example, it is also possible to install a restricting portion and a widening allowance portion at the hole edges of all the lens insertion holes formed at the bottom of the reflection sheet.

  (4) In Embodiment 1 described above, the pair of slits has a shape that forms a straight line along the X-axis direction. For example, the pair of slits has a shape that forms a straight line along the Y-axis direction. Also included in the present invention are those in which the pair of slits are linearly formed along the direction inclined with respect to both the X-axis direction and the Y-axis direction. This technical matter can be similarly applied to those described in the third and fourth embodiments.

  (5) In the above-described first, third, and fourth embodiments, the case where the slit is formed in a straight line when viewed from the front side is shown, but the case where the slit is formed in a curved shape when viewed from the front side is also included in the present invention. It is.

  (6) In the first, third, and fourth embodiments described above, the plurality of slits have substantially the same length, but it is also possible to install slits having different lengths.

  (7) In the first, third, and fourth embodiments described above, a plurality of slits are arranged at equiangular intervals at the hole edge of the lens insertion hole, but the plurality of slits are not formed at the hole edge of the lens insertion hole. Those arranged at equiangular intervals are also included in the present invention.

  (8) In the second embodiment described above, the lens insertion hole having a substantially oval shape when viewed from the front side has a shape in which the long side direction coincides with the Y-axis direction and the short side direction coincides with the X-axis direction. However, the present invention also includes a lens insertion hole having a substantially oval shape in which the long side direction coincides with the X-axis direction and the short-side direction Y-axis direction. Further, the present invention includes a shape in which the long side direction and the short side direction of the lens insertion hole having a substantially oval shape coincide with the directions inclined with respect to both the X axis direction and the Y axis direction, respectively. It is.

  (9) In the above-described second embodiment, the lens insertion hole is formed in a substantially oval shape when viewed from the front side, so that an opening that forms an enlargement allowance portion is formed at a part of the hole edge. In addition, the planar shape of the lens insertion hole can be appropriately changed. For example, it can be a polygonal shape such as a quadrangle (square, rectangle, etc.), a triangle, a pentagon, or a trapezoid when viewed from the front side.

  (10) In each of the above-described embodiments, the diffusion lens has a configuration in which three lens support portions are arranged at equiangular intervals. However, the number and arrangement of the lens support portions can be changed as appropriate. .

  (11) In each of the above-described embodiments, the diffusion lens is provided with a plurality of substantially cylindrical lens support portions. However, the shape of the lens support portion can be changed as appropriate. For example, it is possible to install a plurality of lens support portions formed in a prismatic shape on the diffusion lens, or to install only one lens support portion formed in an annular shape following the outer shape of the diffusion lens.

  (12) In each of the above-described embodiments, the case where the lens support portion is formed integrally with the diffusing lens has been shown, but it is also possible to provide it integrally with the LED substrate. In addition, the lens support portion may be a separate component for both the diffusing lens and the LED substrate, and may be fixed to both by a fixing material such as an adhesive.

  (13) In addition to the above-described embodiments, the number and arrangement of LED substrates in the chassis, the number and arrangement of LEDs and diffusion lenses on the LED substrate, and the like can be changed as appropriate. Further, the number and arrangement of the substrate holding members on the chassis and the LED substrate can be appropriately changed.

  (14) In each of the above-described embodiments, the optical element (optical lens) is a diffusing lens that diffuses light from the LED. However, other than that, for example, a condensing lens having a condensing function, etc. Those using as an optical element are also included in the present invention.

  (15) In each of the above-described embodiments, the liquid crystal panel and the chassis are vertically placed with the short side direction aligned with the vertical direction. However, the liquid crystal panel and the chassis have the long side direction in the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.

  (16) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)). In addition to the liquid crystal display device for display, the present invention can be applied to a liquid crystal display device for monochrome display.

  (17) In each of the embodiments described above, the liquid crystal display device using the liquid crystal panel as the display panel has been illustrated, but the present invention is also applicable to display devices using other types of display panels.

  (18) In each of the above-described embodiments, the television receiver provided with the tuner is exemplified, but the present invention can also be applied to a display device that does not include the tuner.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 14,414 ... Chassis, 14a ... Bottom plate, 17 ... LED (light source), 18,418 ... LED substrate (light source substrate), 18c, 418c ... connector portion (substrate connection portion), 19, 119, 219, 419 ... diffusion lens (optical element), 19d ... lens support portion (optical element support portion), 21, 121, 221, 421... Reflective sheet (reflective member), 21 a, 121 a, 421 a... Bottom, 21 b. ), 21e... Connector insertion hole (connection portion insertion hole), 22, 122, 222, 322, 422... Restricting portion, 23, 123, 223 323,423 ... expansion allowing portion, 24,224,324,424 ... slit, 25 ... opening, TV ... television receiver apparatus

Claims (15)

A light source;
An optical element arranged to cover the light source from its light exit side and emitting an optical action to the light from the light source; and
A chassis having a bottom plate disposed on the side opposite to the light emitting side with respect to the light source;
A reflective member disposed between the bottom plate of the chassis and the optical element and extending along the plate surface of the bottom plate to reflect light, and is inserted through the optical element A reflective member having a hole;
The reflection member is configured by at least a part of a hole edge of the insertion hole in the reflection member, and is disposed at a position overlapping the optical element when viewed from the light emission side, so that the reflection member is disposed on the light emission side. A regulating part capable of regulating displacement,
An opening that is provided at the hole edge of the insertion hole in the reflecting member and that expands the insertion hole so that the restricting portion is displaced to a position that does not overlap the optical element when viewed from the light emitting side. An illumination device comprising an allowance unit. A plurality of the light elements are mounted and a plurality of the optical elements are attached so as to individually cover the plurality of light sources, and a light source substrate disposed on the light emitting side with respect to the bottom plate of the chassis is provided,
The lighting device according to claim 1, wherein the reflection member is disposed so as to be interposed between the optical element and the light source substrate, and has a plurality of insertion holes through which the plurality of optical elements are individually passed. The light source board is arranged in a state in which a plurality are arranged in the plate surface of the bottom plate of the chassis,
The lighting device according to claim 2, wherein the reflection member has a bottom portion that extends along a plate surface of the bottom plate and is disposed so as to straddle the plurality of light source substrates. A plurality of the insertion holes are arranged in a matrix in the bottom of the reflecting member,
Among the plurality of insertion holes, the insertion hole arranged at least at the corner position of the bottom portion has at least a part of the hole edge as the restricting portion, and the opening allowance portion is provided at the hole edge. The lighting device according to claim 3. The reflective member has a rising portion that rises from the end of the bottom toward the light emitting side,
Among the plurality of insertion holes, the insertion hole arranged at least at a position adjacent to the rising portion has at least a part of the hole edge as the restricting portion, and the expansion allowance portion is provided at the hole edge. The illuminating device of Claim 3 or Claim 4 currently provided.   Among the plurality of insertion holes, the insertion hole arranged at least at a position adjacent to the end portion of the light source substrate has at least a part of the hole edge as the restricting portion and the expansion allowance at the hole edge. The lighting device according to any one of claims 3 to 5, wherein a portion is provided. While the plurality of light source boards have board connection portions that are arranged adjacent to each other in the plate surface of the bottom plate of the chassis and electrically connect each other, the bottom portion of the reflecting member Is provided with a connection portion insertion hole through which the substrate connection portion passes.
The insertion hole arranged at least adjacent to the connection part insertion hole among the plurality of insertion holes has at least a part of the hole edge as the restricting portion and is expanded to the hole edge. The lighting device according to claim 6, further comprising an allowance portion. Between the optical element and the light source substrate, an optical element support portion that supports the optical element at a position away from the light source mounting surface of the light source substrate toward the light emitting side is provided in the circumferential direction of the optical element. Along the line,
The lighting device according to claim 2, wherein the insertion hole has a hole diameter that surrounds the optical element support portion.   The lighting device according to any one of claims 1 to 8, wherein the expansion allowing portion is configured by a slit formed at a hole edge of the insertion hole.   The lighting device according to claim 9, wherein the restricting portion is arranged over the entire circumference of the hole edge of the insertion hole.   The lighting device according to claim 9 or 10, wherein the slits are arranged such that a pair of the slits are positioned on a straight line at a hole edge of the insertion hole.   The lighting device according to any one of claims 1 to 8, wherein the expansion allowance portion is configured by an opening portion that is partially formed at a hole edge of the insertion hole. The optical element has a substantially circular shape when viewed from the light emitting side, whereas the insertion hole has a substantially oval shape when viewed from the light emitting side, and the long side dimension thereof is larger than the radial dimension of the optical element. In contrast, the short side dimension is smaller than the diameter dimension of the optical element,
The hole edge on the long side of the hole edge of the insertion hole is the restriction portion that overlaps with the optical element when viewed from the light emitting side, whereas the opening portion is viewed from the light emitting side. The illuminating device according to claim 12, wherein the expansion allowing portion is configured by being formed between a hole edge on a short side of the hole edge of the insertion hole and the optical element.   A display device comprising: the illumination device according to any one of claims 1 to 13; and a display panel that performs display using light from the illumination device.   A television receiver comprising the display device according to claim 14.

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