JP6523360B2

JP6523360B2 - Planar lighting device

Info

Publication number: JP6523360B2
Application number: JP2017051370A
Authority: JP
Inventors: 英之徳永; 誠古田; 貴志枝光
Original assignee: MinebeaMitsumi Inc
Current assignee: MinebeaMitsumi Inc
Priority date: 2016-06-24
Filing date: 2017-03-16
Publication date: 2019-05-29
Anticipated expiration: 2037-03-16
Also published as: CN207020329U; JP2018006322A; CN107544111B; CN107544111A

Description

本発明は、面状照明装置に関する。 The present invention relates to a planar illumination device.

トップビュー型のＬＥＤ（Light Emitting Diode）が導光板の入光面に対向するように配置される面状照明装置がある。 There is a planar illumination device in which a top view type LED (Light Emitting Diode) is disposed to face the light incident surface of the light guide plate.

特開２００２−１５６６３２号公報JP 2002-156632 A

近年、面状照明装置の薄型化の要求に伴い、ＬＥＤの厚さに対して導光板の厚さが相対的に小さくなってきている。このため、導光板とＬＥＤとの光軸の位置合わせ精度の向上が、輝度や輝度分布等の輝度特性を高いレベルで安定化させる上で重要である。 In recent years, the thickness of the light guide plate has become relatively smaller than the thickness of the LED in accordance with the demand for thinning the planar illumination device. Therefore, it is important to improve the alignment accuracy of the light axes of the light guide plate and the LED in order to stabilize the luminance characteristics such as luminance and luminance distribution at a high level.

本発明は、上記に鑑みてなされたものであって、薄型化の要求に応えつつ、優れた輝度特性を有する面状照明装置を提供することを目的とする。 This invention is made in view of the above, Comprising: It aims at providing the planar illumination device which has the outstanding brightness characteristic, responding to the demand of thickness reduction.

上述した課題を解決し、目的を達成するために、本発明の一態様に係る面状照明装置は、側面から入射された光を出射面から出射する導光板と、前記側面側に配置され、前記側面に入射される光を発する発光面を有する光源と、２つの主面を有し、一方の主面に、前記光源の前記発光面とは反対側の面が実装される基板と、側面及び床面を有し、前記導光板、前記光源及び前記基板を収納するフレームと、前記導光板及び前記光源と前記床面との間に配置され、前記導光板と前記光源とのいずれにも固定されて前記導光板と前記光源とを直接に連結させる第１連結部材と、を備え、前記第１連結部材の同一面には、前記導光板の前記出射面とは反対側の面の少なくとも一部と、前記光源の前記床面側の面の少なくとも一部とが取り付けられる。
また、本発明の一態様に係る面状照明装置は、側面から入射された光を出射面から出射する導光板と、前記側面側に配置され、前記側面に入射される光を発する光源と、前記出射面とは反対側に配置され、前記導光板と前記光源とのいずれにも固定されて前記導光板と前記光源とを直接に連結させる第１連結部材と、前記出射面側に配置され、前記導光板と前記光源とのいずれにも固定されて前記導光板と前記光源とを直接に連結させる第２連結部材とを備える。
また、本発明の一態様に係る面状照明装置は、側面から入射された光を出射面から出射する導光板と、前記側面側に配置され、前記側面に入射される光を発する光源と、前記出射面側に配置され、前記導光板と前記光源とのいずれにも固定されて前記導光板と前記光源とを直接に連結させる連結部材と、前記出射面の少なくとも一部と、前記光源の前記連結部材側の面の少なくとも一部とを覆うように配置され、前記出射面から出射された光を拡散する拡散シートと、を備え、前記連結部材は、厚み方向において、前記拡散シートと前記導光板及び前記光源との間に配置される。 In order to solve the problems described above and to achieve the object, a planar illumination device according to an aspect of the present invention is disposed on a side surface side of a light guide plate that emits light incident from a side surface from the output surface, A light source having a light emitting surface emitting light incident on the side surface, a substrate having two main surfaces, and a surface opposite to the light emitting surface of the light source mounted on one main surface, a side surface And a floor surface, which is disposed between the light guide plate, a frame accommodating the light source and the substrate, the light guide plate and the light source, and the floor surface, and both of the light guide plate and the light source And a first connecting member fixedly connecting the light guide plate and the light source directly , wherein at least one surface of the first connecting member opposite to the light emitting surface of the light guide plate is provided on the same surface of the first connecting member. A portion and at least a portion of the floor side surface of the light source are attached
A planar illumination device according to one aspect of the present invention includes a light guide plate that emits light incident from a side surface from an emission surface, and a light source disposed on the side surface and emitting light incident on the side surface. The first connection member is disposed on the opposite side to the light emission surface, fixed to any of the light guide plate and the light source, and directly connecting the light guide plate and the light source, and arranged on the light emission surface side A second connection member may be fixed to any one of the light guide plate and the light source to directly connect the light guide plate and the light source.
A planar illumination device according to one aspect of the present invention includes a light guide plate that emits light incident from a side surface from an emission surface, and a light source disposed on the side surface and emitting light incident on the side surface. A connecting member which is disposed on the emission surface side, is fixed to any of the light guide plate and the light source, and directly connects the light guide plate and the light source, at least a part of the emission surface, and the light source And a diffusion sheet disposed so as to cover at least a part of the surface on the connection member side and diffusing light emitted from the emission surface, wherein the connection member includes the diffusion sheet and the diffusion sheet in the thickness direction. It is disposed between the light guide plate and the light source.

本発明の一態様によれば、薄型化の要求に応えつつ、優れた輝度特性を有することができる。 According to one embodiment of the present invention, excellent luminance characteristics can be provided while meeting the demand for thinning.

図１は、実施形態に係る面状照明装置の外観の一例を示す正面図である。FIG. 1: is a front view which shows an example of the external appearance of the planar illuminating device which concerns on embodiment. 図２は、図１のＡ−Ａ線における断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 図３は、実施形態に係る面状照明装置の組み立て方法の一例について説明するための図である。FIG. 3 is a diagram for describing an example of an assembling method of the spread illuminating apparatus according to the embodiment. 図４は、実施形態の第１の変形例に係る面状照明装置を説明するための図である。FIG. 4 is a view for explaining a spread illuminating apparatus according to a first modification of the embodiment. 図５は、実施形態の第２の変形例に係る面状照明装置を説明するための図である。FIG. 5 is a view for explaining a planar illumination device according to a second modification of the embodiment. 図６は、実施形態の第３の変形例に係る面状照明装置を説明するための図である。FIG. 6 is a view for explaining a spread illuminating apparatus according to a third modification of the embodiment. 図７は、実施形態の第４の変形例に係る面状照明装置を説明するための図である。FIG. 7 is a view for explaining a spread illuminating apparatus according to a fourth modification of the embodiment. 図８は、実施形態の第５の変形例に係る面状照明装置を説明するための図である。FIG. 8 is a diagram for explaining a spread illuminating apparatus according to a fifth modification of the embodiment. 図９は、実施形態の第６の変形例に係る面状照明装置を説明するための図である。FIG. 9 is a view for explaining a spread illuminating apparatus according to a sixth modification of the embodiment.

以下、実施形態に係る面状照明装置について図面を参照して説明する。なお、図面における各要素の寸法の関係、各要素の比率などは、現実と異なる場合がある。図面の相互間においても、互いの寸法の関係や比率が異なる部分が含まれている場合がある。 Hereinafter, a planar illumination device according to an embodiment will be described with reference to the drawings. In addition, the relationship of the dimension of each element in drawing, the ratio of each element, etc. may differ from reality. Even between the drawings, there may be a case where the dimensional relationships and ratios differ from one another.

（実施形態）
図１は、実施形態に係る面状照明装置の外観の一例を示す正面図である。図１の例に示すように、実施形態に係る面状照明装置１０は、遮光シート３０で覆われていない出射領域（有効エリアとも称される）９０から光を出射する。すなわち、遮光シート３０により、有効エリア９０が規定される。本実施形態に係る面状照明装置１０は、液晶表示装置のバックライトとして用いられる。かかる液晶表示装置は、例えば、スマートフォンにおいて用いられる。 (Embodiment)
FIG. 1: is a front view which shows an example of the external appearance of the planar illuminating device which concerns on embodiment. As shown in the example of FIG. 1, the planar illumination device 10 according to the embodiment emits light from an emission area (also referred to as an effective area) 90 which is not covered by the light shielding sheet 30. That is, the light shielding sheet 30 defines the effective area 90. The planar illumination device 10 according to the present embodiment is used as a backlight of a liquid crystal display device. Such a liquid crystal display device is used, for example, in a smartphone.

なお、図１において、右側の遮光シート３０よりも左側の遮光シート３０の方が、幅が広い。これは、右側の遮光シート３０は、後述するＬＥＤ１４やＦＰＣ（Flexible Printed Circuits）１２等が含まれない比較的狭い領域を覆い、左側の遮光シート３０は、後述するＬＥＤ１４やＦＰＣ１２等を含む比較的広い領域を覆うためである。左側の遮光シート３０の幅は、例えば、１．５ｍｍである。また、図１において、後述する遮光シート３１の図示は省略されている。 In FIG. 1, the light shielding sheet 30 on the left side is wider than the light shielding sheet 30 on the right side. This is because the light shielding sheet 30 on the right side covers a relatively narrow area not including the LED 14 and the FPC (Flexible Printed Circuits) 12 described later, and the light shielding sheet 30 on the left side includes the LED 14 and the FPC 12 described later. This is to cover a large area. The width of the light shielding sheet 30 on the left side is, for example, 1.5 mm. Moreover, in FIG. 1, illustration of the light shielding sheet 31 mentioned later is abbreviate | omitted.

図２は、図１のＡ−Ａ線における断面図である。図２に示すように、面状照明装置１０は、ＦＰＣ１２、固定部材１３、ＬＥＤ１４、第１連結部材１５、導光板１６、第２連結部材１７、拡散シート１８、プリズムシート１９、フレーム２０、反射シート２１、遮光シート３０及び遮光シート３１を有する。 FIG. 2 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 2, the planar illumination device 10 includes the FPC 12, the fixing member 13, the LED 14, the first connecting member 15, the light guide plate 16, the second connecting member 17, the diffusion sheet 18, the prism sheet 19, the frame 20, and the reflection. The sheet 21, the light shielding sheet 30 and the light shielding sheet 31 are provided.

フレーム２０は、ＦＰＣ１２、固定部材１３、ＬＥＤ１４、第１連結部材１５、導光板１６、第２連結部材１７、拡散シート１８及びプリズムシート１９を収納する。フレーム２０は、剛性が大きい、例えば、ステンレス製の板金フレームである。フレーム２０は、側壁部２０ａと、底部２０ｂとを有する。 The frame 20 accommodates the FPC 12, the fixing member 13, the LED 14, the first connection member 15, the light guide plate 16, the second connection member 17, the diffusion sheet 18, and the prism sheet 19. The frame 20 is a sheet metal frame having high rigidity, for example, stainless steel. The frame 20 has a side wall 20a and a bottom 20b.

底部２０ｂは、導光板１６の後述する主面１６ｂに沿って広がる部分である。底部２０ｂは、床面２０ｄを有する。床面２０ｄは、平面２０ｄ＿１及び後述する凹部２０ｃが有する凹状の面２０ｄ＿２を有する。平面２０ｄ＿１には、導光板１６やＬＥＤ１４が載置される。側壁部２０ａは、導光板１６の後述する入光側面１６ｃの長辺に沿って底部２０ｂから光が出射する方向（床面２０ｄの平面２０ｄ＿１の法線方向）に一体に立ち上がる部分である。側壁部２０ａは、側面２０ｅを有する。また、底部２０ｂは、凹部２０ｃを有する。凹部２０ｃは、床面２０ｄの側面２０ｅ側の部分から側面２０ｅに沿って光が出射する方向とは逆の方向に凹むように形成された、ＦＰＣ１２の下端部を逃がす部材である。凹部２０ｃの幅は、より大きな第１連結部材１５が床面２０ｄの平面２０ｄ＿１に配置されるように、狭く形成されている。凹部２０ｃは、凹状の面２０ｄ＿２を有する。なお、本実施形態において、凹部２０ｃは、必須の構成要素ではない。そのため、例えば、底部２０ｂは、凹部２０ｃを有さずに、平坦であってもよい。 The bottom portion 20 b is a portion that extends along a main surface 16 b described later of the light guide plate 16. The bottom 20b has a floor surface 20d. The floor surface 20d has a flat surface 20d_1 and a concave surface 20d_2 which a recess 20c described later has. The light guide plate 16 and the LED 14 are mounted on the flat surface 20d_1. The side wall portion 20a is a portion integrally rising in a direction in which light is emitted from the bottom portion 20b along the long side of the light incident side surface 16c described later of the light guide plate 16 (the normal direction of the plane 20d_1 of the floor surface 20d). The side wall portion 20a has a side surface 20e. The bottom 20b also has a recess 20c. The recess 20c is a member that is formed along the side surface 20e of the floor surface 20d so as to be recessed in the direction opposite to the light emission direction along the side surface 20e, and is a member that escapes the lower end portion of the FPC 12. The width of the recess 20c is narrow so that the larger first connecting member 15 is disposed on the flat surface 20d_1 of the floor surface 20d. The recess 20c has a concave surface 20d_2. In the present embodiment, the recess 20c is not an essential component. Therefore, for example, the bottom 20b may be flat without having the recess 20c.

導光板１６は、透明材料（例えば、ポリカーボネート樹脂）を用いて上面視矩形状に形成されている。導光板１６は、その外表面に、２つの主面１６ａ、１６ｂと、ＬＥＤ１４を配置する側の側面である入光側面（入光面）１６ｃとを有する。入光側面１６ｃには、ＬＥＤ１４が発した光が入射される。２つの主面１６ａ、１６ｂのうち１つの主面１６ａは、入光側面１６ｃから入射された光（ＬＥＤ１４が発した光）が出射される出射面である。そのため、以下の説明では、「主面１６ａ」を「出射面１６ａ」と表記する場合がある。なお、出射面は、光が発光する面でもあるため、発光面とも称される。導光板１６の出射面１６ａとは反対側の面である主面（２つの主面のうち主面１６ａ以外の主面）１６ｂ側の部分には、例えば、複数のドットからなる光路変更パターンが形成されている。光路変更パターンを形成することにより、導光板１６内を進む光の進行方向が変更されて、出射面１６ａから光が出射される。すなわち、実施形態に係る面状照明装置１０は、いわゆるエッジライト型の照明装置である。 The light guide plate 16 is formed in a rectangular shape in top view using a transparent material (for example, a polycarbonate resin). The light guide plate 16 has, on its outer surface, two main surfaces 16a and 16b, and a light incident side surface (light incident surface) 16c which is a side surface on which the LED 14 is disposed. The light emitted from the LED 14 is incident on the light incident side 16 c. One main surface 16a of the two main surfaces 16a and 16b is an emission surface from which light (light emitted from the LED 14) incident from the light incident side surface 16c is emitted. Therefore, in the following description, "main surface 16a" may be described as "emission surface 16a". In addition, since an output surface is also a surface which light emits, it is also called a light emitting surface. In a portion on the main surface (a main surface other than the main surfaces 16a of the two main surfaces) 16b that is the surface on the opposite side to the emission surface 16a of the light guide plate 16, for example, an optical path changing pattern consisting of a plurality of dots It is formed. By forming the optical path changing pattern, the traveling direction of the light traveling in the light guide plate 16 is changed, and the light is emitted from the emission surface 16 a. That is, the planar illumination device 10 according to the embodiment is a so-called edge light illumination device.

反射シート２１は、出射面１６ａとは反対側の主面１６ｂから漏れた光を反射して、再度導光板１６に戻す。反射シート２１は、両面テープ２２により床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１）上に固定された状態で、導光板１６の主面１６ｂと床面２０ｄとの間に配置される。 The reflection sheet 21 reflects the light leaked from the main surface 16 b opposite to the light emission surface 16 a and returns the light to the light guide plate 16 again. The reflection sheet 21 is disposed between the main surface 16b of the light guide plate 16 and the floor surface 20d in a state of being fixed on the floor surface 20d (specifically, the flat surface 20d_1 of the floor surface 20d) by the double-sided tape 22. .

両面テープ２２は、例えば、白色の両面テープであり、一方の面が反射シート２１の一部に貼り付けられ、他方の面が床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１）に貼り付けられる。これにより、両面テープ２２が、反射シート２１を床面２０ｄ上に固定する。 The double-sided tape 22 is, for example, a white double-sided tape, one side of which is attached to part of the reflection sheet 21 and the other side of which is attached to the floor 20d (specifically, the flat 20d_1 of the floor 20d). Will be attached. Thereby, the double-sided tape 22 fixes the reflective sheet 21 on the floor surface 20d.

ＬＥＤ１４は、点状の光源（点状光源）である。ＬＥＤ１４は、例えば、青色ＬＥＤと黄色蛍光体とからなる疑似白色ＬＥＤである。ＬＥＤ１４は、全体として略直方体状に形成され、ＦＰＣ１２に実装される面と反対側の面に発光面１４ａを有するいわゆるトップビュー型のＬＥＤである。本実施形態では、ＬＥＤ１４が複数設けられ、複数のＬＥＤ１４は、その発光面１４ａを、導光板１６の入光側面１６ｃに対向させた状態で、入光側面１６ｃの長辺方向に沿って、所定の間隔を空けて（又は密着させて）配置される。そして、複数のＬＥＤ１４は、入光側面１６ｃに向けて光を発する。このように、複数のＬＥＤ１４は、入光側面１６ｃに入射される光を発する。 The LED 14 is a point light source (point light source). The LED 14 is, for example, a pseudo white LED composed of a blue LED and a yellow phosphor. The LED 14 is a so-called top view type LED which is formed in a substantially rectangular parallelepiped shape as a whole and has a light emitting surface 14 a on the surface opposite to the surface to be mounted on the FPC 12. In the present embodiment, a plurality of LEDs 14 are provided, and the plurality of LEDs 14 are predetermined along the long side direction of the light incident side surface 16 c in a state where the light emitting surface 14 a is opposed to the light incident side surface 16 c of the light guide plate 16. Are spaced apart (or closely attached). Then, the plurality of LEDs 14 emit light toward the light incident side 16 c. Thus, the plurality of LEDs 14 emit light that is incident on the light incident side surface 16 c.

ＦＰＣ１２は、２つの主面１２ａ、１２ｂを有し、ＬＥＤ１４側の一方の主面１２ａに、ＬＥＤ１４の発光面１４ａとは反対側の面が実装される基板である。ＦＰＣ１２を介して、図示しない電源からの電力がＬＥＤ１４に供給され、ＬＥＤ１４が点灯する。 The FPC 12 is a substrate having two main surfaces 12a and 12b, and the surface on the opposite side to the light emitting surface 14a of the LED 14 is mounted on one of the main surfaces 12a on the LED 14 side. Power from a power supply (not shown) is supplied to the LED 14 via the FPC 12 and the LED 14 is lit.

固定部材１３は、フレーム２０が有する側面２０ｅに対してＦＰＣ１２を固定させる。固定部材１３は、例えば、両面テープであり、一方の面がＦＰＣ１２の主面１２ａとは反対側の主面１２ｂに貼り付けられ、他方の面が側面２０ｅに貼り付けられることにより、側面２０ｅに対してＦＰＣ１２が固定される。 The fixing member 13 fixes the FPC 12 to the side surface 20 e of the frame 20. The fixing member 13 is, for example, a double-sided adhesive tape, and one surface is attached to the main surface 12b opposite to the main surface 12a of the FPC 12 and the other surface is attached to the side surface 20e. On the other hand, the FPC 12 is fixed.

第１連結部材１５は、導光板１６及びＬＥＤ１４と床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１）との間に配置され、導光板１６とＬＥＤ１４とを光学的または構造的に連結させる。具体例を挙げて説明すると、第１連結部材１５は、導光板１６の光軸とＬＥＤ１４の光軸とが一致された状態で、導光板１６の入光側面１６ｃとＬＥＤ１４の発光面１４ａとを連結させる。第１連結部材１５は、ＬＥＤ１４が並ぶ方向を長軸方向とする短冊状の片面テープであり、粘着層（粘着剤）１５ａ及び基材１５ｂを含む。なお、第１連結部材１５は、粘着層１５ａ及び基材１５ｂから形成される片面テープに限られず、例えば、基材１５ｂ、及び、基材１５ｂのＬＥＤ１４側の主面に貼り付けられた両面テープから形成される片面テープであってもよい。 The first connection member 15 is disposed between the light guide plate 16 and the LED 14 and the floor surface 20 d (specifically, the flat surface 20 d of the floor surface 20 d), and optically or structurally connects the light guide plate 16 and the LED 14. . Describing with a specific example, the first connecting member 15 is configured such that the light incident side surface 16 c of the light guide plate 16 and the light emitting surface 14 a of the LED 14 are in a state where the optical axis of the light guide plate 16 and the optical axis of the LED 14 are aligned. Concatenate. The first connecting member 15 is a strip-shaped single-sided tape whose longitudinal direction is the direction in which the LEDs 14 are arranged, and includes an adhesive layer (adhesive) 15 a and a base material 15 b. In addition, the 1st connection member 15 is not restricted to the single-sided tape formed from adhesion layer 15a and base material 15b, for example, the double-sided tape stuck on the main surface by the side of LED14 of base material 15b and base material 15b. It may be a single-sided tape formed from

基材１５ｂは、例えば、ＰＥＴであり、粘着層１５ａは、例えば、シリコンやアクリルである。粘着層１５ａは、導光板１６の主面１６ｂのＬＥＤ１４寄りの少なくとも一部に粘着するとともに、ＬＥＤ１４の床面２０ｄ側の面の導光板１６寄りの少なくとも一部に粘着する。これにより、第１連結部材１５に、導光板１６の主面１６ｂの少なくとも一部と、ＬＥＤ１４の床面２０ｄ側の面の少なくとも一部とが取り付けられることとなる。この結果、第１連結部材１５は、導光板１６の入光側面１６ｃとＬＥＤ１４の発光面１４ａとを連結させる。 The substrate 15 b is, for example, PET, and the adhesive layer 15 a is, for example, silicon or acrylic. The adhesive layer 15a adheres to at least a part of the main surface 16b of the light guide plate 16 close to the LED 14 and adheres to at least a part of the surface of the LED 14 close to the floor surface 20d close to the light guide plate 16. As a result, at least a portion of the main surface 16 b of the light guide plate 16 and at least a portion of the surface on the floor surface 20 d side of the LED 14 are attached to the first connection member 15. As a result, the first connecting member 15 connects the light incident side surface 16 c of the light guide plate 16 and the light emitting surface 14 a of the LED 14.

本実施形態に係る第１連結部材１５は、片面テープであるため、床面２０ｄに対して導光板１６及びＬＥＤ１４が固定されない。このため、面状照明装置１０に外部から何らかの力が加わった場合であっても、導光板１６及びＬＥＤ１４は、外部からの力を逃がすことができる。このため、本実施形態に係る面状照明装置１０によれば、導光板１６及びＬＥＤ１４の破損の発生を抑制することができる。 Since the first connection member 15 according to the present embodiment is a single-sided tape, the light guide plate 16 and the LED 14 are not fixed to the floor surface 20 d. For this reason, even when a force is applied to the planar illumination device 10 from the outside, the light guide plate 16 and the LED 14 can release the force from the outside. For this reason, according to the planar illumination device 10 which concerns on this embodiment, generation | occurrence | production of the failure | damage of the light-guide plate 16 and LED14 can be suppressed.

第１連結部材１５は、光を吸収する部材、又は、光を反射する部材を有する。例えば、第１連結部材１５が、光を反射する部材を有する場合には、ＬＥＤ１４の発光面１４ａから発された光を反射して、再度導光板１６に戻すため、輝度を向上させることができる。 The first connection member 15 has a member that absorbs light or a member that reflects light. For example, when the first connection member 15 includes a member that reflects light, the light emitted from the light emitting surface 14 a of the LED 14 is reflected and returned to the light guide plate 16 again, so that the brightness can be improved. .

なお、たとえば、ＬＥＤ１４の厚さよりも導光板１６の厚さの方が厚いなど、ＬＥＤ１４の厚さと導光板１６の厚さが異なる場合であっても、第１連結部材１５を用いることで、ＬＥＤ１４の床面２０ｄ側の面と導光板１６の主面１６ｂとを面一にして、ＬＥＤ１４と導光板１６とを連結することができる。したがって、実施形態によれば、第１連結部材１５を用いることで、ＬＥＤ１４と導光板１６との光の結合効率を安定させることができる。 In addition, for example, even when the thickness of the LED 14 and the thickness of the light guide plate 16 are different, for example, the thickness of the light guide plate 16 is thicker than the thickness of the LED 14, the LED 14 can be used by using the first connection member 15. The LED 14 and the light guide plate 16 can be connected such that the surface on the floor surface 20 d side of the light guide plate 16 is flush with the main surface 16 b of the light guide plate 16. Therefore, according to the embodiment, by using the first connection member 15, the light coupling efficiency between the LED 14 and the light guide plate 16 can be stabilized.

第２連結部材１７は、導光板１６及びＬＥＤ１４に対して第１連結部材１５とは反対側に配置され、導光板１６とＬＥＤ１４とを光学的または構造的に連結させる。具体例を挙げて説明すると、導光板１６の入光側面１６ｃとＬＥＤ１４の発光面１４ａとを連結させる。第２連結部材１７は、後述する拡散シート１８と導光板１６及びＬＥＤ１４との間に配置される。第２連結部材１７は、両面テープであり、一方の面が、導光板１６の出射面１６ａのＬＥＤ１４寄りの少なくとも一部に貼り付けられるとともに、ＬＥＤ１４の床面２０ｄとは反対側の面の導光板１６寄りの少なくとも一部に貼り付けられる。これにより、第２連結部材１７に、導光板１６の主面１６ａの少なくとも一部と、ＬＥＤ１４の床面２０ｄとは反対側の面の少なくとも一部とが取り付けられることとなる。この結果、第２連結部材１７は、導光板１６の入光側面１６ｃとＬＥＤ１４の発光面１４ａとを連結させる。 The second connection member 17 is disposed on the side opposite to the first connection member 15 with respect to the light guide plate 16 and the LED 14, and optically or structurally connects the light guide plate 16 and the LED 14. Describing with a specific example, the light incident side surface 16 c of the light guide plate 16 and the light emitting surface 14 a of the LED 14 are connected. The second connection member 17 is disposed between the diffusion sheet 18 described later and the light guide plate 16 and the LED 14. The second connecting member 17 is a double-sided tape, and one surface is attached to at least a part of the light emitting surface 16 a of the light guide plate 16 near the LED 14, and the second connecting member 17 guides the surface on the opposite side to the floor surface 20 d of the LED 14. It is attached to at least a part of the light plate 16 side. Thus, at least a portion of the main surface 16 a of the light guide plate 16 and at least a portion of the surface of the LED 14 opposite to the floor surface 20 d are attached to the second connection member 17. As a result, the second connecting member 17 connects the light incident side surface 16 c of the light guide plate 16 and the light emitting surface 14 a of the LED 14.

また、第２連結部材１７の他方の面が、拡散シート１８の側壁部２０ａ側の少なくとも一部に貼り付けられる。これにより、第２連結部材１７は、拡散シート１８を導光板１６及びＬＥＤ１４に固定させる。したがって、第２連結部材１７は、拡散シート１８が導光板１６から浮いてしまうことを抑制することができるので、有効エリア９０から出射される光の輝度や輝度分布等の輝度特性の劣化を抑制することができる。 Further, the other surface of the second connection member 17 is attached to at least a part of the diffusion sheet 18 on the side wall portion 20 a side. Thereby, the second connection member 17 fixes the diffusion sheet 18 to the light guide plate 16 and the LED 14. Therefore, since the second connection member 17 can suppress the diffusion sheet 18 from floating from the light guide plate 16, the deterioration of the luminance characteristics such as the luminance and the luminance distribution of the light emitted from the effective area 90 is suppressed. can do.

拡散シート１８は、導光板１６の出射面１６ａ側に配置され、出射面１６ａから出射される光を拡散する。具体例を挙げて説明すると、拡散シート１８は、出射面１６ａ及びＬＥＤ１４の床面２０ｄとは反対側の面の少なくとも一部を覆うように配置され、出射面１６ａから出射された光を拡散する。拡散シート１８は、上述したように、第２連結部材１７により導光板１６及びＬＥＤ１４に固定される。 The diffusion sheet 18 is disposed on the emission surface 16 a side of the light guide plate 16 and diffuses the light emitted from the emission surface 16 a. Describing with a specific example, the diffusion sheet 18 is disposed so as to cover at least a part of the surface on the opposite side to the emission surface 16a and the floor surface 20d of the LED 14 and diffuses the light emitted from the emission surface 16a. . The diffusion sheet 18 is fixed to the light guide plate 16 and the LED 14 by the second connection member 17 as described above.

プリズムシート１９は、拡散シート１８に対して導光板１６とは反対側に配置され、拡散シート１８により拡散された光の配光制御を行って、配光制御が行われた光を出射する。 The prism sheet 19 is disposed on the side opposite to the light guide plate 16 with respect to the diffusion sheet 18, performs light distribution control of the light diffused by the diffusion sheet 18, and emits the light subjected to the light distribution control.

遮光シート３０は、プリズムシート１９の側壁部２０ａ側の一部を覆うように配置され、導光板１６の出射面１６ａのうち一部の領域から出射される光を遮ることにより、面状照明装置１０から光が出射される有効エリア９０を規定する。 The light shielding sheet 30 is disposed so as to cover a part of the side surface 20 a of the prism sheet 19, and shields light emitted from a part of the emission surface 16 a of the light guide plate 16 to provide a planar lighting device. 10 defines an effective area 90 from which light is emitted.

例えば、遮光シート３０は、光を遮ることが可能な片面テープであり、一端側の部分がフレーム２０の側壁部２０ａの外側の面に貼り付けられる。また、遮光シート３０の他端側の部分のプリズムシート１９側の面は、プリズムシート１９の側壁部２０ａ側の一部に貼り付けられる。 For example, the light shielding sheet 30 is a single-sided tape capable of blocking light, and a portion at one end is attached to the outer surface of the side wall 20 a of the frame 20. In addition, the surface on the side of the prism sheet 19 of the part on the other end side of the light shielding sheet 30 is attached to a part of the side of the side wall 20 a of the prism sheet 19.

遮光シート３１は、光を遮ることが可能な両面テープである。遮光シート３１の２つの面のうち、一方の面は、遮光シート３０の他端側の部分に貼り付けられ、他方の面は、面状照明装置１０をバックライトとして用いる液晶表示装置に貼り付けられる。 The light shielding sheet 31 is a double-sided tape capable of shielding light. One of the two surfaces of the light shielding sheet 31 is attached to the other end of the light shielding sheet 30, and the other surface is attached to a liquid crystal display using the planar lighting device 10 as a backlight. Be

次に、図３を参照して、面状照明装置１０の組み立て方法について説明する。図３は、実施形態に係る面状照明装置１０の組み立て方法の一例について説明するための図である。 Next, referring to FIG. 3, a method of assembling the planar lighting device 10 will be described. FIG. 3 is a diagram for explaining an example of an assembling method of the spread illuminating apparatus 10 according to the embodiment.

図３の例に示すように、工程１では、まず、ＦＰＣ１２の主面１２ａにＬＥＤ１４を実装する。次に、ＬＥＤ１４の床面２０ｄ側の面の少なくとも一部に第１連結部材１５を取り付ける。そして、ＦＰＣ１２の主面１２ｂを、固定部材１３を用いてフレーム２０の側面２０ｅに固定させる。例えば、第１連結部材１５を床面２０ｄの平面２０ｄ＿１に載置し、第１連結部材１５が床面２０ｄの平面２０ｄ＿１上を滑るようにＦＰＣ１２及びＬＥＤ１４を側面２０ｅに向けて移動させて、ＦＰＣ１２の主面１２ｂを固定部材１３を用いて側面２０ｅに固定させる。本実施形態によれば、このように、第１連結部材１５を床面２０ｄの平面２０ｄ＿１に載置し、第１連結部材１５が床面２０ｄの平面２０ｄ＿１上を滑るようにＦＰＣ１２及びＬＥＤ１４を側面２０ｅに向けて移動させるという簡易な方法で、主面１２ｂを、固定部材１３を用いて側面２０ｅに固定させることができる。 As shown in the example of FIG. 3, in process 1, first, the LED 14 is mounted on the main surface 12 a of the FPC 12. Next, the first connecting member 15 is attached to at least a part of the surface of the LED 14 on the floor surface 20 d side. Then, the main surface 12 b of the FPC 12 is fixed to the side surface 20 e of the frame 20 using the fixing member 13. For example, the first connecting member 15 is placed on the flat surface 20d_1 of the floor surface 20d, and the FPC 12 and the LED 14 are moved toward the side surface 20e so that the first connecting member 15 slides on the flat surface 20d_1 of the floor surface 20d. The main surface 12b of the is fixed to the side surface 20e using the fixing member 13. According to the present embodiment, as described above, the first connecting member 15 is placed on the flat surface 20d_1 of the floor surface 20d, and the FPC 12 and the LED 14 are side surfaces such that the first connecting member 15 slides on the flat surface 20d_1 of the floor surface 20d. The main surface 12b can be fixed to the side surface 20e using the fixing member 13 by a simple method of moving it toward 20e.

なお、工程１において、ＦＰＣ１２の主面１２ｂを固定部材１３を用いて側面２０ｅに固定させた後に、片面テープである第１連結部材１５の基材１５ｂ側の面を接着剤により床面２０ｄに対して固定させてもよい。これにより、面状照明装置１０に外部から何らかの力が加わった場合であっても、ＬＥＤ１４及び導光板１６がフレーム２０に固定されているので、ＬＥＤ１４及び導光板１６が移動することが抑制される。この結果、ＬＥＤ１４及び導光板１６が他の部材と接触したり、ＬＥＤ１４の光軸に対して導光板１６の光軸がずれたり、ＬＥＤ１４と導光板１６との間隔が広がったりすることが抑制される。したがって、実施形態によれば、ＬＥＤ１４及び導光板１６の破損、及び、光学特性の変化を抑制することができる。 In step 1, after the main surface 12b of the FPC 12 is fixed to the side surface 20e using the fixing member 13, the surface of the first connecting member 15 which is a single-sided tape on the base 15b side is bonded to the floor surface 20d with an adhesive. Alternatively, it may be fixed. Thereby, even if a force is applied to the planar illumination device 10 from the outside, the LED 14 and the light guide plate 16 are fixed to the frame 20, so that the movement of the LED 14 and the light guide plate 16 is suppressed . As a result, it is suppressed that the LED 14 and the light guide plate 16 come into contact with other members, the optical axis of the light guide plate 16 deviates with respect to the optical axis of the LED 14, and the distance between the LED 14 and the light guide plate 16 is increased. Ru. Therefore, according to the embodiment, it is possible to suppress the breakage of the LED 14 and the light guide plate 16 and the change of the optical characteristics.

工程２では、床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１）を厚さ方向の位置合わせ基準として導光板１６の光軸（例えば、導光板１６の厚さ方向の中心）とＬＥＤ１４の光軸（例えば、ＬＥＤ１４の厚さ方向の中心）との位置合わせを行い、２つの光軸が一致する状態で、導光板１６の主面１６ｂの少なくとも一部を第１連結部材１５に取り付ける。これにより、導光板１６の光軸とＬＥＤ４０との光軸が一致し、導光板１６の入光側面１６ｃとＬＥＤ１４の発光面１４ａとが連結した状態でＬＥＤ１４に対して導光板１６が固定される。したがって、本実施形態に係る面状照明装置１０によれば、導光板１６とＬＥＤ１４との光軸の位置合わせ精度が向上される。よって、本実施形態に係る面状照明装置１０によれば、輝度や輝度分布等の輝度特性を高いレベルで安定化させることができる。また、本実施形態に係る面状照明装置１０によれば、導光板１６とＬＥＤ１４とを連結させる第１連結部材１５の厚さが薄いため、薄型化の要求に応えることができる。以上のことから、本実施形態に係る面状照明装置１０によれば、薄型化の要求に応えつつ、優れた輝度特性を有することができる。 In step 2, the floor surface 20d (specifically, the flat surface 20d of the floor surface 20d) is used as an alignment reference in the thickness direction, and the optical axis of the light guide plate 16 (for example, the center in the thickness direction of the light guide plate 16) Alignment with the optical axis (for example, the center in the thickness direction of the LED 14) is performed, and at least a part of the main surface 16b of the light guide plate 16 is attached to the first connection member 15 in a state where the two optical axes coincide. Thereby, the optical axis of the light guide plate 16 coincides with the optical axis of the LED 40, and the light guide plate 16 is fixed to the LED 14 in a state where the light incident side 16c of the light guide plate 16 and the light emitting surface 14a of the LED 14 are connected. . Therefore, according to the planar illumination device 10 which concerns on this embodiment, the position alignment precision of the optical axis of the light-guide plate 16 and LED14 is improved. Therefore, according to the planar illumination device 10 according to the present embodiment, it is possible to stabilize the luminance characteristics such as the luminance and the luminance distribution at a high level. Moreover, according to the planar illumination device 10 which concerns on this embodiment, since the thickness of the 1st connection member 15 which connects the light-guide plate 16 and LED14 is thin, it can respond to the request | requirement of thickness reduction. From the above, according to the planar illumination device 10 relating to the present embodiment, it is possible to have excellent luminance characteristics while meeting the demand for thinning.

また、ＬＥＤ１４の厚さと導光板１６の厚さが異なる場合（特に、ＬＥＤ１４の厚さが導光板１６の厚さよりも小さい場合）には、工程２において、ＬＥＤ１４の床面２０ｄ側の面と導光板１６の主面１６ｂとを面一にした上で、導光板１６の光軸とＬＥＤ１４の光軸との位置合わせを行ってもよい。ＬＥＤ１４の厚さと導光板１６の厚さが一致する場合も同様である。 When the thickness of the LED 14 and the thickness of the light guide plate 16 are different (in particular, when the thickness of the LED 14 is smaller than the thickness of the light guide plate 16), in step 2, the surface of the LED 14 on the floor surface 20d side The optical axis of the light guide plate 16 may be aligned with the optical axis of the LED 14 after the main surface 16 b of the light plate 16 is made flush. The same applies to the case where the thickness of the LED 14 matches the thickness of the light guide plate 16.

また、工程２では、導光板１６を第１連結部材１５に取り付ける際に、両面テープ２２を用いて、反射シート２１を床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１）上に固定してもよい。 In step 2, when attaching the light guide plate 16 to the first connection member 15, the reflection sheet 21 is fixed on the floor surface 20d (specifically, the flat surface 20d_1 of the floor surface 20d) using the double-sided tape 22. May be

なお、工程１及び工程２において、ＬＥＤ１４を実装したＦＰＣ１２が、固定部材１３により側面２０ｅに固定された後に、ＬＥＤ１４と導光板１６とが第１連結部材１５により連結される場合について説明したが、本実施形態は、これに限られない。例えば、ＦＰＣ１２に実装されたＬＥＤ１４と、導光板１６とを第１連結部材１５を用いて連結した後に、固定部材１３を用いて、ＦＰＣ１２の主面１２ｂを側面２０ｅに固定させてもよい。 In addition, although the case where LED14 and the light-guide plate 16 were connected by the 1st connection member 15 was demonstrated in the process 1 and the process 2, after FPC12 which mounted LED14 was fixed to the side 20e by the fixing member 13. The present embodiment is not limited to this. For example, after the LED 14 mounted on the FPC 12 and the light guide plate 16 are connected using the first connection member 15, the main surface 12b of the FPC 12 may be fixed to the side surface 20e using the fixing member 13.

工程３では、両面テープである第２連結部材１７の一方の面を、導光板１６の出射面１６ａのＬＥＤ１４寄りの少なくとも一部に貼り付けるとともに、ＬＥＤ１４の床面２０ｄとは反対側の面の導光板１６寄りの少なくとも一部に貼り付ける。この結果、第２連結部材１７は、導光板１６の入光側面１６ｃとＬＥＤ１４の発光面１４ａとを連結させることができる。 In step 3, one surface of the second connecting member 17 which is a double-sided tape is attached to at least a part of the emitting surface 16 a of the light guide plate 16 closer to the LED 14, and the surface of the LED 14 on the opposite side to the floor surface 20 d It is attached to at least a part of the light guide plate 16 side. As a result, the second connection member 17 can connect the light incident side surface 16 c of the light guide plate 16 and the light emitting surface 14 a of the LED 14.

工程４では、第２連結部材１７の他方の面を、拡散シート１８の側壁部２０ａ側の少なくとも一部に貼り付ける。 In step 4, the other surface of the second connection member 17 is attached to at least a part of the diffusion sheet 18 on the side wall portion 20 a side.

工程５では、プリズムシート１９を、拡散シート１８に対して導光板１６とは反対側に配置する。そして、工程５では、片面テープである遮光シート３０の一端側の部分をフレーム２０の側壁部２０ａの外側の面に貼り付ける。また、工程５では、遮光シート３０の他端側の部分のプリズムシート１９側の面を、プリズムシート１９の側壁部２０ａ側の一部に貼り付ける。そして、工程５では、両面テープである遮光シート３１の２つの面のうち、一方の面を、遮光シート３０の他端側の部分に貼り付ける。 In step 5, the prism sheet 19 is disposed on the side opposite to the light guide plate 16 with respect to the diffusion sheet 18. Then, in step 5, a portion on one end side of the light shielding sheet 30 which is a single-sided tape is attached to the outer surface of the side wall portion 20 a of the frame 20. Further, in step 5, the surface on the side of the prism sheet 19 of the part on the other end side of the light shielding sheet 30 is attached to a part of the side of the side wall 20 a of the prism sheet 19. Then, in step 5, one of the two surfaces of the light shielding sheet 31 that is a double-sided tape is attached to the other end of the light shielding sheet 30.

以上、本実施形態に係る面状照明装置１０について説明した。上述したように、本実施形態に係る面状照明装置１０によれば、薄型化の要求に応えつつ、優れた輝度特性を有することができる。 The planar illumination device 10 according to the present embodiment has been described above. As described above, the planar illumination device 10 according to the present embodiment can have excellent brightness characteristics while meeting the demand for thinning.

（実施形態の第１の変形例、第２の変形例）
上述した実施形態では、第１連結部材１５が、光を吸収する部材、又は、光を反射する部材を有する場合について説明した。しかしながら、第１連結部材１５は、光を透過する部材であってもよい。そこで、第１連結部材１５が光を透過する部材である場合の２つの実施形態を、実施形態の第１の変形例及び第２の変形例として説明する。第１の変形例及び第２の変形例の説明において、上述した実施形態と同様の構成については、同一の符号を付して、説明を省略する場合がある。 (First Modification of Embodiment, Second Modification)
In the embodiment described above, the case where the first connection member 15 has a member that absorbs light or a member that reflects light has been described. However, the first connection member 15 may be a member that transmits light. Thus, two embodiments in which the first connecting member 15 is a member that transmits light will be described as a first modified example and a second modified example of the embodiment. In the description of the first modified example and the second modified example, the same components as those in the above-described embodiment may be assigned the same reference numerals and descriptions thereof may be omitted.

図４は、実施形態の第１の変形例に係る面状照明装置１０ａを説明するための図であり、図５は、実施形態の第２の変形例に係る面状照明装置１０ｂを説明するための図である。第１連結部材１５が、光を透過する部材である場合には、図４に示すように、上述した反射シート２１を、第１連結部材１５と床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１）との間まで延びるように配置して、反射シート２１が第１連結部材１５を透過した光を反射して、再度導光板１６に戻すようにしてもよい。これにより、第１の変形例に係る面状照明装置１０ａによれば、輝度を向上させることができる。 FIG. 4 is a view for explaining a surface illumination device 10a according to a first modification of the embodiment, and FIG. 5 is a view for explaining a surface illumination device 10b according to a second modification of the embodiment It is a figure for. When the first connection member 15 is a member that transmits light, as shown in FIG. 4, the first connection member 15 and the floor surface 20 d (specifically, the floor surface 20 d), as shown in FIG. The reflection sheet 21 may be arranged to extend to the plane 20d_1) so that the light transmitted through the first connection member 15 may be reflected back to the light guide plate 16 again. Thereby, according to the planar illumination device 10a which concerns on a 1st modification, a brightness | luminance can be improved.

また、反射シート２１を第１連結部材１５と床面２０ｄとの間まで延びるように配置するのではなく、図５に示すように、反射シート２１とは別の反射シート２５を、第１連結部材１５と床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１）との間に配置してもよい。かかる構成により、第２の変形例に係る面状照明装置１０ｂにおいても、輝度を向上させることができる。 Further, instead of arranging the reflection sheet 21 so as to extend between the first connection member 15 and the floor surface 20d, as shown in FIG. 5, the reflection sheet 25 different from the reflection sheet 21 is firstly connected You may arrange | position between the member 15 and the floor surface 20d (specifically plane 20d_1 of the floor surface 20d). With this configuration, it is possible to improve the luminance also in the planar illumination device 10b according to the second modification.

（実施形態の第３の変形例）
次に、実施形態の第３の変形例について説明する。第３の変形例の説明において、上述した実施形態と同様の構成については、同一の符号を付して、説明を省略する場合がある。 Third Modified Example of Embodiment
Next, a third modification of the embodiment will be described. In the description of the third modified example, the same components as those in the above-described embodiment may be assigned the same reference numerals and descriptions thereof may be omitted.

図６は、実施形態の第３の変形例に係る面状照明装置を説明するための図である。図６に示すように、第１連結部材１５は、ＬＥＤ１４の前方すなわち光出射方向を除いた領域にのみ設けられている。したがって、各ＬＥＤ１４の前方において、導光板１６の主面１６ｂ（図２参照）と床面２０ｄ（具体的には床面２０ｄの平面２０ｄ＿１（図２参照））との間には空気層が存在するだけであるため、ＬＥＤ１４の前方に出射されて入光側面１６ｃに入射し、主面１６ｂに到達した光は、大きな透過率でもって、第１連結部材１５（粘着層１５ａ）へ進入することなく、導光板１６と空気との境界における通常の反射によって導光板１６の内部へ導かれる。したがって、第３の変形例に係る面状照明装置によれば、輝度を向上させることができる。 FIG. 6 is a view for explaining a spread illuminating apparatus according to a third modification of the embodiment. As shown in FIG. 6, the first connection member 15 is provided only in the front of the LED 14, that is, in the area excluding the light emission direction. Therefore, an air layer is present between the main surface 16b (see FIG. 2) of the light guide plate 16 and the floor surface 20d (specifically, the flat surface 20d_1 of the floor surface 20d (see FIG. 2)) in front of each LED 14. Therefore, the light emitted to the front of the LED 14 and incident on the light incident side surface 16c and reaching the principal surface 16b enters the first connection member 15 (adhesive layer 15a) with a large transmittance. Instead, it is guided to the inside of the light guide plate 16 by the normal reflection at the boundary between the light guide plate 16 and the air. Therefore, according to the planar illumination device of the third modification, the luminance can be improved.

なお、第３の変形例において、第１連結部材１５が、ＬＥＤ１４の光出射方向を除いた領域にのみ設けられている例について説明したが、粘着層１５ａが、ＬＥＤ１４の光出射方向を除いた領域にのみ設けられ、基材１５ｂが、第１の実施形態と同様の形状、すなわち、短冊状であってもよい。 In the third modification, an example is described in which the first connection member 15 is provided only in the area excluding the light emission direction of the LED 14, but the adhesive layer 15 a excludes the light emission direction of the LED 14. It may be provided only in the region, and the substrate 15b may have the same shape as that of the first embodiment, that is, a strip shape.

（実施形態の第４の変形例）
上述した実施形態では、粘着層１５ａが１つである場合について説明したが、粘着層１５ａは、導光板１６に貼り付けられる粘着層と、ＬＥＤ１４に貼り付けられる粘着層とに分かれていてもよい。そこで、このような実施形態を、実施形態の第４の変形例として説明する。第４の変形例の説明において、上述した実施形態と同様の構成については、同一の符号を付して、説明を省略する場合がある。 Fourth Modification of Embodiment
Although the case where the adhesion layer 15a is one was described in the embodiment described above, the adhesion layer 15a may be divided into an adhesion layer attached to the light guide plate 16 and an adhesion layer attached to the LED 14 . Thus, such an embodiment will be described as a fourth modification of the embodiment. In the description of the fourth modified example, the same components as those in the above-described embodiment may be assigned the same reference numerals and descriptions thereof may be omitted.

図７は、実施形態の第４の変形例に係る面状照明装置を説明するための図である。図７に示すように、第４の変形例に係る面状照明装置では、第１連結部材１５は、基材１５ｂ、基材１５ｂ上に設けられ導光板１６に粘着する第１粘着層１５ａ＿１、及び、基材１５ｂ上に設けられＬＥＤ１４に粘着する第２粘着層１５ａ＿２を含む。かかる構成により、第１粘着層１５ａ＿１及び第２粘着層１５ａ＿２の厚さを独立して調整することができるため、図７に示すように、導光板１６の厚さとＬＥＤ１４の厚さとが異なる場合であっても、導光板１６とＬＥＤ１４との厚さ方向の中心（光軸）を一致させることができる。 FIG. 7 is a view for explaining a spread illuminating apparatus according to a fourth modification of the embodiment. As shown in FIG. 7, in the planar illumination device according to the fourth modification, the first connecting member 15 is provided on the base material 15 b and the base material 15 b and adheres to the light guide plate 16. And a second adhesive layer 15a_2 provided on the substrate 15b and adhering to the LED 14. With this configuration, the thickness of the first adhesive layer 15a_1 and the second adhesive layer 15a_2 can be adjusted independently, so as shown in FIG. 7, when the thickness of the light guide plate 16 and the thickness of the LED 14 are different. Even in the case, the centers (optical axes) in the thickness direction of the light guide plate 16 and the LED 14 can be made to coincide with each other.

（実施形態の第５の変形例）
上述した実施形態では、第１連結部材１５が床面２０ｄの平面２０ｄ＿１上に配置される例について説明したが、第１連結部材１５は、床面２０ｄに形成された凹部２０ｃ（具体的には凹部２０ｃの凹状の面２０ｄ＿２上）に配置されてもよい。そこで、このような実施形態を、実施形態の第５の変形例に係る面状照明装置として説明する。第５の変形例の説明において、上述した実施形態と同様の構成については、同一の符号を付して、説明を省略する場合がある。 Fifth Modification of Embodiment
In the embodiment described above, an example in which the first connecting member 15 is disposed on the flat surface 20d_1 of the floor surface 20d has been described, but the first connecting member 15 is a recess 20c formed on the floor surface 20d (specifically, It may be disposed on the concave surface 20d_2 of the recess 20c). Thus, such an embodiment will be described as a planar illumination device according to a fifth modification of the embodiment. In the description of the fifth modified example, the same components as those in the above-described embodiment may be assigned the same reference numerals and descriptions thereof may be omitted.

図８は、実施形態の第５の変形例に係る面状照明装置を説明するための図である。図８に示す第５の変形例に係る面状照明装置１０ｃは、第１連結部材１５が凹部２０ｃ（具体的には凹部２０ｃの凹状の面２０ｄ＿２上）に配置されている点と、１つの遮光シート３０に代えて２つの遮光シート３０ｂ、３０ｃを備える点が、図２に示す実施形態に係る面状照明装置１０と異なる。なお、図８に示す面状照明装置１０ｃは、粘着層１５ａが、ＬＥＤ１４の光出射方向を除いた領域にのみ設けられ、基材１５ｂが、上述した実施形態と同様の形状、すなわち、短冊状である。 FIG. 8 is a diagram for explaining a spread illuminating apparatus according to a fifth modification of the embodiment. The planar illumination device 10c according to the fifth modification shown in FIG. 8 has a point that the first connecting member 15 is disposed in the recess 20c (specifically, on the recessed surface 20d_2 of the recess 20c), and one It differs from the planar illumination device 10 according to the embodiment shown in FIG. 2 in that two light shielding sheets 30 b and 30 c are provided instead of the light shielding sheet 30. In the planar illumination device 10 c shown in FIG. 8, the adhesive layer 15 a is provided only in the region excluding the light emission direction of the LED 14, and the base 15 b has the same shape as the embodiment described above, that is, a strip shape. It is.

図８に示すように、第１連結部材１５が凹部２０ｃ（具体的には凹部２０ｃの凹状の面２０ｄ＿２上）に配置されているため、凹部２０ｃの幅が比較的広い場合には、より大きな第１連結部材１５を凹部２０ｃ配置することができる。 As shown in FIG. 8, since the first connection member 15 is disposed in the recess 20c (specifically, on the recessed surface 20d_2 of the recess 20c), when the width of the recess 20c is relatively wide, the larger one is larger The first connecting member 15 can be disposed in the recess 20c.

また、遮光シート３０ｂは、光を遮ることが可能な片面テープであり、一端側の部分がフレーム２０の側壁部２０ａの外側の面に貼り付けられる。 In addition, the light shielding sheet 30 b is a single-sided tape capable of shielding light, and a portion on one end side is attached to the outer surface of the side wall 20 a of the frame 20.

遮光シート３０ｃは、光を遮ることが可能な両面テープであり、一端側の部分のプリズムシート１９側の面が、遮光シート３０ｂの他端側の部分に貼り付けられる。また、遮光シート３０ｃの他端側の部分のプリズムシート１９側の面が、プリズムシート１９の側壁部２０ａ側の一部に貼り付けられる。また、遮光シート３０ｃのプリズムシート１９とは反対側の面は、面状照明装置１０をバックライトとして用いる液晶表示装置に貼り付けられる。かかる構成により、プリズムシート１９の光出射方向側に存在する遮光シートの枚数が１枚となるため、プリズムシート１９の光出射方向側に存在する遮光シートの枚数が２枚以上の場合と比較して、薄型化を図ることができる。 The light shielding sheet 30c is a double-sided tape capable of shielding light, and the surface on the prism sheet 19 side of the one end side portion is attached to the other end side portion of the light shielding sheet 30b. Further, the surface on the side of the prism sheet 19 of the portion on the other end side of the light shielding sheet 30 c is attached to a part of the side of the side wall 20 a of the prism sheet 19. Further, the surface of the light shielding sheet 30c opposite to the prism sheet 19 is attached to a liquid crystal display device using the planar illumination device 10 as a backlight. With such a configuration, the number of light shielding sheets present on the light emitting direction side of the prism sheet 19 is one, and therefore, the number of light shielding sheets present on the light emitting direction side of the prism sheet 19 is two or more. Can be made thinner.

（実施形態の第６の変形例）
上述した実施形態では、第１連結部材１５が片面テープである場合について説明した。しかしながら、第１連結部材１５は、両面テープであってもよい。そこで、このような実施形態を、実施形態の第６の変形例に係る面状照明装置として説明する。第６の変形例の説明において、上述した実施形態と同様の構成については、同一の符号を付して、説明を省略する場合がある。 Sixth Modification of Embodiment
In the embodiment described above, the case where the first connecting member 15 is a single-sided tape has been described. However, the first connection member 15 may be a double-sided tape. Thus, such an embodiment will be described as a planar illumination device according to a sixth modification of the embodiment. In the description of the sixth modified example, the same components as those in the above-described embodiment may be assigned the same reference numerals and descriptions thereof may be omitted.

図９は、実施形態の第６の変形例に係る面状照明装置を説明するための図である。図９の例に示すように、第６の変形例に係る面状照明装置１０ｄは、第１連結部材１５に代えて、第１連結部材３２を備える。 FIG. 9 is a view for explaining a spread illuminating apparatus according to a sixth modification of the embodiment. As shown in the example of FIG. 9, a planar illumination device 10 d according to the sixth modification includes a first connecting member 32 instead of the first connecting member 15.

第１連結部材３２は、導光板１６とＬＥＤ１４とを光学的または構造的に連結させる。また、第１連結部材３２は、導光板１６及びＬＥＤ１４をフレーム２０に固定させる。第１連結部材３２は、両面テープであり、粘着層３２ａ，３２ｂ及び基材３２ｃを含む。粘着層３２ａ，３２ｂは、例えば、シリコンやアクリルである。基材３２ｃは、例えば、ＰＥＴである。 The first connection member 32 optically or structurally connects the light guide plate 16 and the LED 14. In addition, the first connecting member 32 fixes the light guide plate 16 and the LED 14 to the frame 20. The first connecting member 32 is a double-sided tape, and includes adhesive layers 32a and 32b and a base 32c. The adhesive layers 32a and 32b are, for example, silicon or acrylic. The base 32c is, for example, PET.

粘着層３２ａは、基材３２ｃのＬＥＤ１４側の主面に配置されている。粘着層３２ａは、導光板１６の主面１６ｂのＬＥＤ１４寄りの少なくとも一部に粘着するとともに、ＬＥＤ１４の床面２０ｄ側の面の導光板１６寄りの少なくとも一部に粘着する。これにより、第１連結部材３２に、導光板１６の主面１６ｂの少なくとも一部と、ＬＥＤ１４の床面２０ｄ側の面の少なくとも一部とが取り付けられることとなる。この結果、第１連結部材３２は、導光板１６の入光側面１６ｃとＬＥＤ１４の発光面１４ａとを連結させる。 The adhesive layer 32 a is disposed on the main surface of the base 32 c on the LED 14 side. The adhesive layer 32 a adheres to at least a part of the main surface 16 b of the light guide plate 16 close to the LED 14 and adheres to at least a part of the surface of the LED 14 close to the floor surface 20 d close to the light guide plate 16. As a result, at least a portion of the main surface 16 b of the light guide plate 16 and at least a portion of the surface on the floor surface 20 d side of the LED 14 are attached to the first connection member 32. As a result, the first connecting member 32 connects the light incident side surface 16 c of the light guide plate 16 and the light emitting surface 14 a of the LED 14.

粘着層３２ｂは、基材３２ｃの床面２０ｄ側の主面に配置されている。粘着層３２ｂは、床面２０ｄに粘着する。これにより、第１連結部材３２は、導光板１６及びＬＥＤ１４を、床面２０ｄ、延いてはフレーム２０に固定させる。 The adhesive layer 32 b is disposed on the main surface of the base 32 c on the floor surface 20 d side. The adhesive layer 32b adheres to the floor surface 20d. Thereby, the first connection member 32 fixes the light guide plate 16 and the LED 14 to the floor surface 20 d and the frame 20.

第６の変形例では、面状照明装置１０ｄに外部から何らかの力が加わった場合であっても、ＬＥＤ１４及び導光板１６がフレーム２０に固定されているので、ＬＥＤ１４及び導光板１６が移動することが抑制される。この結果、ＬＥＤ１４及び導光板１６が他の部材と接触したり、ＬＥＤ１４の光軸に対して導光板１６の光軸がずれたり、ＬＥＤ１４と導光板１６との間隔が広がったりすることが抑制される。したがって、第６の変形例に係る面状照明装置１０ｄによれば、ＬＥＤ１４及び導光板１６の破損、及び、光学特性の変化を抑制することができる。 In the sixth modification, the LED 14 and the light guide plate 16 are fixed to the frame 20 even when some force is applied to the planar illumination device 10 d from the outside, so the LED 14 and the light guide plate 16 move. Is suppressed. As a result, it is suppressed that the LED 14 and the light guide plate 16 come into contact with other members, the optical axis of the light guide plate 16 deviates with respect to the optical axis of the LED 14, and the distance between the LED 14 and the light guide plate 16 is increased. Ru. Therefore, according to the planar illumination device 10d according to the sixth modification, the breakage of the LED 14 and the light guide plate 16 and the change of the optical characteristics can be suppressed.

以上、実施形態及び第１〜第６の変形例について説明した。なお、上記実施の形態により本発明が限定されるものではない。上述した各構成要素を適宜組み合わせて構成したものも本発明に含まれる。また、さらなる効果や変形例は、当業者によって容易に導き出すことができる。よって、本発明のより広範な態様は、上記の実施の形態に限定されるものではなく、様々な変更が可能である。 The embodiment and the first to sixth modifications have been described above. The present invention is not limited by the above embodiment. The present invention also includes those configured by appropriately combining the above-described components. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above embodiment, and various modifications are possible.

１０、１０ａ、１０ｂ、１０ｃ、１０ｄ面状照明装置
１２ＦＰＣ（基板）
１３固定部材
１４ＬＥＤ（光源）
１５、３２第１連結部材
１５ａ、３２ａ、３２ｂ粘着層
１５ｂ、３２ｃ基材
１６導光板
１７第２連結部材
１８拡散シート
１９プリズムシート
２０フレーム
２０ａ側壁部
２０ｂ底部
２０ｃ凹部
２０ｄ床面
２０ｅ側面
３０遮光シート
３１遮光シート 10, 10a, 10b, 10c, 10d planar lighting device 12 FPC (substrate)
13 Fixing member 14 LED (light source)
15, 32 first connecting member 15a, 32a, 32b adhesive layer 15b, 32c base 16 light guide plate 17 second connecting member 18 diffusion sheet 19 prism sheet 20 frame 20a side wall 20b bottom 20c recessed 20d floor 20e side 30 light shielding sheet 31 shading sheet

Claims

A light guide plate for emitting light incident from the side surface from the emission surface;
A light source disposed on the side surface and having a light emitting surface that emits light incident on the side surface;
A substrate having two main surfaces, and the main surface opposite to the light emitting surface of the light source is mounted on one of the main surfaces;
A frame which has a side surface and a floor surface and which accommodates the light guide plate, the light source and the substrate;
A first connecting member disposed between the light guide plate and the light source and the floor surface and fixed to any of the light guide plate and the light source to directly connect the light guide plate and the light source;
Equipped with
At least a portion of a surface of the light guide plate opposite to the light emitting surface and at least a portion of a surface of the light source on the floor surface are attached to the same surface of the first connection member. Lighting device.

The light guide plate and the light source are connected to each other such that the surface of the light guide plate opposite to the light emission surface of the light guide plate is flush with the surface on the floor surface side of the light source in the first connection member. The planar illumination device of claim 1.

The planar illumination device according to claim 2, further comprising a fixing member fixing the substrate to the side surface of the frame.

The planar lighting device according to claim 3, wherein the first connection member is a single-sided tape, and the fixing member is a double-sided tape.

The planar illumination device according to claim 3, wherein the first connection member and the fixing member are both double-sided tapes, and the first connection member fixes the light guide plate and the light source to the frame.

The planar illumination device according to any one of claims 1 to 5, wherein the first connection member includes a member that absorbs light or a member that reflects light.

The first connection member is a member that transmits light,
The planar illumination according to any one of claims 1 to 5, further comprising a reflection sheet disposed between the first connection member and the floor surface and reflecting light transmitted through the first connection member. apparatus.

The first connection member is provided in an area excluding the light emission direction of the light source.
The planar illumination device as described in any one of Claims 1-7.

The first connection member includes a base, and an adhesive layer provided on the base and adhering to the light guide plate and the light source.
The adhesive layer is provided in an area excluding the light emission direction of the light source.
The planar illumination device as described in any one of Claims 1-7.

The first connection member includes a base, a first adhesive layer provided on the base and adhering to the light guide plate, and a second adhesive layer provided on the base and adhering to the light source. The planar illumination device as described in any one of claim 1 to 8.

The light guide plate and the light source according to any one of claims 1 to 10, further comprising a second connection member disposed on the opposite side to the first connection member and connecting the light guide plate and the light source. The planar lighting device according to claim 1.

A diffusion sheet which is disposed so as to cover at least a part of the emission surface of the light guide plate and at least a part of the surface of the light source on the second connection member side, and diffuses the light emitted from the emission surface. In addition,
The planar illumination device according to claim 11, wherein the second connection member is disposed between the diffusion sheet and the light guide plate and the light source in a thickness direction.

A light guide plate for emitting light incident from the side surface from the emission surface;
A light source disposed on the side surface and emitting light incident on the side surface;
A first connecting member disposed on the side opposite to the light emitting surface and fixed to both the light guide plate and the light source to directly connect the light guide plate and the light source;
A planar illumination device comprising: a second connecting member disposed on the light emitting surface side and fixed to any one of the light guide plate and the light source to directly connect the light guide plate and the light source.

It further comprises a diffusion sheet which is disposed to cover at least a part of the emission surface and at least a part of the surface on the second connection member side of the light source, and diffuses the light emitted from the emission surface.
The planar illumination device according to claim 13, wherein the second connection member is disposed between the diffusion sheet, the light guide plate, and the light source in a thickness direction.

The planar illumination device according to claim 14, wherein the second connection member is a double-sided tape, and the diffusion sheet is fixed to the light guide plate and the light source.

A light guide plate for emitting light incident from the side surface from the emission surface;
A light source disposed on the side surface and emitting light incident on the side surface;
A connecting member disposed on the light emitting surface side and fixed to any one of the light guide plate and the light source to directly connect the light guide plate and the light source;
A diffusion sheet which is disposed so as to cover at least a part of the emission surface and at least a part of the surface of the light source on the connection member side, and diffuses the light emitted from the emission surface;
Equipped with
The planar illumination device, wherein the connection member is disposed between the diffusion sheet, the light guide plate, and the light source in a thickness direction.