JP4318665B2

JP4318665B2 - Structure for preventing deflection of light correction sheet in planar illumination device

Info

Publication number: JP4318665B2
Application number: JP2005148859A
Authority: JP
Inventors: 裕一毛利
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2005-05-23
Filing date: 2005-05-23
Publication date: 2009-08-26
Anticipated expiration: 2025-05-23
Also published as: JP2006331649A

Description

この発明は面状照明装示装置に係り、詳しくは、その発光部の前面に設置される光補正シートのたわみの防止構造に関する。 The present invention relates to a planar illumination display device, and more particularly to a structure for preventing the deflection of a light correction sheet installed on the front surface of a light emitting unit.

一般に、面状照明装置には、面状発光部とその前カバーとの間に種々の光補正シートが設置されている。例えば、発光部表面の輝度を高めるための輝度上昇シート、光偏光選択性反射透過シート、集光シート、拡散シートなどである。 Generally, in a planar illumination device, various light correction sheets are installed between a planar light emitting unit and its front cover. For example, a brightness increasing sheet for increasing the brightness of the light emitting portion surface, a light polarization selective reflection / transmission sheet, a condensing sheet, a diffusion sheet, and the like.

これらの光補正シートは、透過光性能を充分に発揮させるために一般的に薄膜状に形成されており、熱や湿度の変化によって伸縮しやすく、また、歪を発生し易い。そのため、そのシートの伸縮や歪によって、発光部の明るさにむらが生じるという問題がある。特に、大型の光補正シートの場合にこの問題は顕著であり、液晶表示装置の大型化に伴い、透過型液晶表示装置の照明（バックライト）用に使用される照明装置も、その大型化が進む今日、この問題の解決は急務である。 These light correction sheets are generally formed in a thin film shape in order to sufficiently exhibit the transmitted light performance, and are easily expanded and contracted by changes in heat and humidity, and are likely to be distorted. Therefore, there is a problem in that the brightness of the light emitting part is uneven due to expansion and contraction and distortion of the sheet. This problem is particularly noticeable in the case of a large light correction sheet. With the increase in size of liquid crystal display devices, the size of illumination devices used for illumination (backlight) of transmissive liquid crystal display devices is also increasing. Today's advancing solution to this problem is urgent.

そのような問題に対処するため、光補正シートの端部にシャーシ形状を取り付けておき、熱や湿気でシートが変形し、それにたわみが生じた場合、そのシャーシ形状を局所的に押さえることにより、シートの中央のたわみを四隅に追いやって、表示装置の表示中心に対応する領域のシートのたわみの存在を解消しようとする方法が下記の公知文献（特許文献１）に開示されている。
特開平１１−３０６８３５号公報 In order to deal with such problems, a chassis shape is attached to the end of the light correction sheet, and when the sheet is deformed due to heat or moisture and bending occurs, the chassis shape is locally suppressed, The following known document (Patent Document 1) discloses a method in which the deflection of the center of the sheet is followed to the four corners to eliminate the presence of the sheet deflection in the region corresponding to the display center of the display device.
Japanese Patent Laid-Open No. 11-306835

しかしながら、上記公知文献に開示された照明装置における光補正シートのたわみの防止構造では、たわみが発生した場合には、いちいちそのシートに設けたシャーシ形状を局所的に押さえて、たわみを四隅に追いやるという甚だ原始的で手間のかかることをしなければならない、という問題がある。 However, in the structure for preventing the deflection of the light correction sheet in the illumination device disclosed in the above-mentioned publicly known document, when the deflection occurs, the chassis shape provided on the sheet is locally pressed and the deflection is driven to the four corners. The problem is that you have to do something primitive and time-consuming.

また、手作業であるので、その作業を行う作業者によってたわみの解消状態にもバラつきが生じる、という問題もある。 Moreover, since it is a manual work, there is also a problem that the state of deflection cancellation varies depending on the worker who performs the work.

そこで、本発明は、面状照明装置における光補正シートのたわみが、上記のような手間をとらずに、また、確実に解消できるようにすることを課題とする。 Accordingly, an object of the present invention is to enable the deflection of the light correction sheet in the planar illumination device to be surely eliminated without taking the above-described trouble.

上記課題を達成するために、本発明は、面状発光部の前面に光補正シートが設置された面状照明装置において、前記発光部と前記光補正シートを収納する矩形の筐体またはそのカバーの左右の対称位置に、表示装置の前後方向に向かう対の係合突起が突設されており、前記光補正シートは、それを前記筐体に設置した際に、前記係合突起に対応する位置に対の係合穴が形成されており、その係合穴の部分で前記係合突起に垂下されるようになっており、左右の各係合穴の形状は、少なくとも、シートの縦中心軸に対して左のものは左下に、右のものは右下に向かう斜辺を有するとともに、対応する各係合突起の係合断面を隙間をもって含む形状を成し、その係合突起は、前記係合穴に対し、係合穴を係合させて光補正シートを垂下した際、係合穴との接触部位が係合穴の前記斜辺部のみとなるような形状と位置関係を有している光補正シートのたわみ防止構造の構成を採用したのである。 In order to achieve the above object, according to the present invention, in a planar illumination device in which a light correction sheet is installed on the front surface of a planar light emitting unit, a rectangular casing or a cover for housing the light emitting unit and the light correction sheet. A pair of engaging protrusions extending in the front-rear direction of the display device are provided at left and right symmetrical positions, and the light correction sheet corresponds to the engaging protrusion when the light correction sheet is installed on the casing. A pair of engagement holes are formed at the positions, and the engagement holes are suspended by the engagement protrusions. The shape of each of the left and right engagement holes is at least the longitudinal center of the seat The left one with respect to the shaft has a hypotenuse on the lower left, the right one has a hypotenuse toward the lower right, and has a shape including the engagement cross section of each corresponding engagement protrusion with a gap, When the light correction sheet is suspended by engaging the engagement hole with the engagement hole, Contact portion between the holes is the adopted configuration of the deflection preventing structure of an optical compensation sheet having a positional relationship between the shape such that only the oblique side of the engaging hole.

すなわち、本発明の本質は、光補正シートを、それに設けた係合穴と筐体側の係合突起との間で支持させ、その支持力から斜面を介在させて水平分力を発生させ、その水平分力によって、前記光補正シートに、その板面に沿う緊張力を発現させようとしたものである。 That is, the essence of the present invention is that the light correction sheet is supported between the engagement hole provided on the light correction sheet and the engagement protrusion on the housing side, and a horizontal component force is generated by interposing a slope from the support force. The tension force along the plate surface is to be expressed in the light correction sheet by a horizontal component force.

そのため、上記のように構成して、前記光補正シートを左右の係合穴で対応する係合突起に垂下させると、シートが係合突起に及ぼす自重の係合突起からの反力は、シートの係合穴の斜辺部のみにかかり、左右それぞれの係合穴において、前記反力の水平分力が全てシートの外向きの分力となる。従って、その左右の外向き水平分力によってシートを緊張状態に保つことができる。 Therefore, when configured as described above and the light correction sheet is suspended by the corresponding engagement protrusions at the left and right engagement holes, the reaction force from the engagement protrusions of its own weight exerted on the engagement protrusions is reduced by the sheet. The horizontal component of the reaction force is the component of the outward direction of the seat in each of the left and right engagement holes. Therefore, the sheet can be kept in tension by the left and right outward horizontal component forces.

また、上記課題を達成するための他の構成として、面状発光部の前面に光補正シートが設置された面状照明装置において、前記発光部と前記光補正シートを収納する矩形の筐体またはそのカバーの下辺の左右に、照明装置の前後方向に向かう対の係止突起が突設されており、前記光補正シートは、それを前記筐体に設置した際に、前記係止突起に対応する位置に切り欠きが形成されており、その切り欠きの部分で前記係止突起に係止されるようになっており、左右の各切り欠きは、少なくとも、シートの縦中心軸に対して左のものは左下に、右のものは右下に向かう斜辺を有しており、前記係止突起は、前記切り欠きに対し、その切り欠きを係止させて光補正シートを垂下した際、切り欠きとの接触部位が切り欠きの前記斜辺部のみとなるような形状と位置関係を有している光補正シートのたわみ防止構造の構成とすることもできる。 Further, as another configuration for achieving the above object, in a planar illumination device in which a light correction sheet is installed on the front surface of a planar light emitting unit, a rectangular housing that houses the light emitting unit and the light correction sheet or A pair of locking projections projecting in the front-rear direction of the lighting device are provided on the left and right sides of the lower side of the cover, and the light correction sheet corresponds to the locking projection when it is installed on the housing. A cutout is formed at a position where the cutout is locked to the locking projection, and the left and right cutouts are at least left with respect to the longitudinal center axis of the sheet. The right one has a hypotenuse on the lower left and the right one has a hypotenuse toward the lower right, and the locking projection is cut when the light correction sheet is suspended by locking the notch to the notch. The contact part with the notch is only the oblique side of the notch. It may also be configured for deflection preventing structure of an optical compensation sheet with a shape and a positional relationship.

この場合も、前記光補正シートを、左右の切り欠きで対応する係止突起に係止させると、シートが係止突起に及ぼす自重の係止突起からの反力は、シートの切り欠きの斜辺部のみにかかり、左右それぞれの切り欠きにおいて、前記反力の水平分力が全てシートの外向きの分力となるので、その左右の外向き水平分力によって光補正シートを緊張状態に保つことができる。 In this case as well, when the light correction sheet is locked to the corresponding locking protrusions by the left and right cutouts, the reaction force from the locking protrusions of the own weight exerted on the locking protrusions by the sheet causes the oblique sides of the cutouts of the sheets. Since the horizontal component of the reaction force is the component of the sheet's outward force at the left and right cutouts, the light correction sheet is kept in tension by the lateral component of the left and right. Can do.

さらに他の構成として、面状発光部の前面に光補正シートが設置された面状照明装置において、
前記発光部と前記光補正シートを収納する矩形の筐体またはそのカバーの左右の側辺のいずれか一方寄りに照明装置の前後方向に沿う回転軸と、他方寄りに照明装置の前後方向に向かう係合突起が突設されており、前記光補正シートを前記筐体またはそのカバーに設置する際に、その光補正シートの前記回転軸に対応する位置をその回転軸回りに回転可能に支持させた状態で前記筐体またはそのカバーに設置した際に、光補正シートには前記係合突起に対応する位置に係合穴が形成されており、その係合穴の部分で前記係合突起に垂下されるようになっており、その係合穴の形状は、少なくとも、シートの縦中心軸に対して左のものは左下に、右のものは右下に向かう斜辺を有するとともに、対応する係合突起の係合断面を隙間をもって含む形状を成し、その係合突起は、前記係合穴に対し、係合穴を係合させて光補正シートを垂下した際、係合穴との接触部位が係合穴の前記斜辺部のみとなるような形状と位置関係を有している構成とすることもできる。 As another configuration, in the planar illumination device in which the light correction sheet is installed on the front surface of the planar light emitting unit,
A rotating shaft along the front-rear direction of the lighting device is located closer to one of the left and right sides of the rectangular housing or the cover for housing the light emitting unit and the light correction sheet, and the other side is directed to the front-rear direction of the lighting device. Engaging protrusions project, and when the light correction sheet is installed on the casing or its cover, a position corresponding to the rotation axis of the light correction sheet is supported rotatably around the rotation axis. When the light correction sheet is installed in the housing or its cover in a state of being engaged, an engagement hole is formed at a position corresponding to the engagement protrusion, and the engagement protrusion is formed in the engagement hole portion. The shape of the engagement hole is such that at least the left one has a hypotenuse toward the lower left and the right one has a hypotenuse toward the lower right with respect to the longitudinal center axis of the sheet, and the corresponding engagement holes. Includes the engagement cross section of the mating protrusion with a gap The engaging projection is engaged with the engaging hole with respect to the engaging hole, and when the light correction sheet is suspended, the contact portion with the engaging hole is only the oblique side portion of the engaging hole. It can also be set as the structure which has the shape and positional relationship which become.

この場合も、前記光補正シートを、その係合穴を係合突起に係止させると、係合穴と前記回転軸を結ぶ距離とシートの自重を掛け合わせたモーメントが係合突起に作用し、その係合突起からの反力は、シートの係合穴の斜辺部のみにかかり、その係合穴において、前記反力の水平分力がシートの外向きの分力となるので、その外向き水平分力によって光補正シートを緊張状態に保つことができる。 In this case as well, when the engagement hole of the light correction sheet is locked to the engagement protrusion, a moment obtained by multiplying the distance between the engagement hole and the rotation shaft and the weight of the sheet acts on the engagement protrusion. The reaction force from the engagement protrusion is applied only to the oblique side portion of the engagement hole of the sheet, and the horizontal component of the reaction force becomes the component of the sheet outward in the engagement hole. The light correction sheet can be kept in a tension state by the horizontal orientation force.

さらにまた、この場合において、光補正シートに緊張状態を与えるための、光シートが筐体またはカバーに回転可能に支持された状態での対の係合形状として、係止突起と切り欠きの関係を形成しても上記と同じ効果を得ることができる。詳細は、後出の第４の実施形態を参照されたい。 Furthermore, in this case, as a paired engagement shape in a state where the light sheet is rotatably supported by the housing or the cover for giving a tension state to the light correction sheet, the relationship between the locking protrusion and the notch Even if formed, the same effect as described above can be obtained. For details, refer to the fourth embodiment described later.

以上説明したように、本発明によれば、光補正シートのたわみがシートの自重によって自動的に解消されるので、たわみの発生について人が認識を持っておく必要がなく、また、たわみの解消を人手で行う必要がないので、全く手間のかからない、たわみの防止対策を得ることができる。たわみの発生がなくなるので、面状照明装置の輝度の均一性の向上に繋がる。 As described above, according to the present invention, since the deflection of the light correction sheet is automatically eliminated by the weight of the sheet, it is not necessary for the person to be aware of the occurrence of the deflection and the deflection is eliminated. Since it is not necessary to carry out the operation manually, it is possible to obtain a countermeasure for preventing the deflection which is not time-consuming at all. Since the occurrence of deflection is eliminated, the uniformity of luminance of the planar lighting device is improved.

従って、本発明の光補正シートとそのたわみ防止構造を備えた面状装置を透過型液晶表示装置のバックライトに用いれば、表示品位の良好な表示装置を得ることができる。 Therefore, if the planar device provided with the light correction sheet and the deflection preventing structure of the present invention is used for the backlight of a transmissive liquid crystal display device, a display device with good display quality can be obtained.

先ず、本発明による面状照明装置の以下の各実施形態における共通の構造について説明する。図１は、前カバー１、光補正シート２(以下、簡単にシート２と称する)、面状発光部３、およびそれらを保持する筐体部品を分解斜視図で模式的に示したものである。 First, a common structure in the following embodiments of the planar lighting device according to the present invention will be described. FIG. 1 is an exploded perspective view schematically showing a front cover 1, a light correction sheet 2 (hereinafter simply referred to as a sheet 2), a planar light emitting unit 3, and a housing component for holding them. .

筐体部品は、シート２の後方に配置される矩形の筐体４と、シート２を挟んで筐体４の前面に取り付けられる矩形枠の前カバー１および筐体４の背後の後カバー５とから成る。図では煩雑さを避けるため、シート２は一枚しか描いていないが、先述したように、光偏光選択性反射透過シート、集光シート、拡散シートなど、複数のシートが設けられるのが一般的である。 The housing parts are a rectangular housing 4 disposed behind the seat 2, a rectangular frame front cover 1 attached to the front surface of the housing 4 with the seat 2 interposed therebetween, and a rear cover 5 behind the housing 4. Consists of. In order to avoid complication, only one sheet 2 is drawn in the figure, but as described above, a plurality of sheets such as a light polarization selective reflection / transmission sheet, a light collecting sheet, and a diffusion sheet are generally provided. It is.

上記筐体４について詳述すると、図１に示すように、筐体４の矩形の左右の側辺の前面、上辺寄りの位置に、前記したシート２を支持するための後述の係合突起または係止突起が照明装置の背面から正面に向かう向きに突設される（図１ではその内、係合突起４aを形成したものを示している）。これら突起と筐体４とは樹脂の一体成型で形成されたものである。また、この実施形態で、筐体４は、面状発光部３を構成する複数の棒状ランプ３ａのホルダにもなっており、その矩形の枠内に、複数の棒状ランプ３ａが左右に配設されて面状発光部３が構成されている。 The housing 4 will be described in detail. As shown in FIG. 1, the engagement protrusion described later for supporting the above-described sheet 2 at the front and upper side positions of the left and right sides of the rectangle of the housing 4 or The locking projection is provided so as to project from the back surface to the front surface of the lighting device (FIG. 1 shows the one in which the engagement projection 4a is formed). These protrusions and the housing 4 are formed by integral molding of resin. In this embodiment, the housing 4 also serves as a holder for a plurality of rod-shaped lamps 3a constituting the planar light emitting unit 3, and the plurality of rod-shaped lamps 3a are disposed on the left and right within the rectangular frame. Thus, the planar light emitting unit 3 is configured.

以上が本発明の実施形態の共通の構造であり、以下の各実施形態では、その共通構造についての重複説明は避け、各実施形態間で形状の異なる前記係合突起と係合穴および切り欠きとの関係を中心に説明する。 The above is the common structure of the embodiments of the present invention, and in the following embodiments, the overlapping description of the common structure is avoided, and the engagement protrusions, the engagement holes, and the notches that are different in shape between the embodiments. The explanation will focus on the relationship.

（第１の実施形態）
第１の実施形態では、先述したシート２のたわみ防止構造の内、シート２に設けた係合穴２ａと筐体４の側柱に設けた係合突起４ａとで構成する場合を示す。図２（a）はその筐体４にシート２を装着し、前記前カバー１を外した状態で正面から観た図であり、図２（ｂ）はその係合突起４ａと係合穴２ａの存在部分を、シート２の正面左側の部分について、図２（ｃ）はその右側の部分について、それぞれ要部拡大図で示したものである。 (First embodiment)
In 1st Embodiment, the case where it comprises with the engagement hole 2a provided in the sheet | seat 2 and the engagement protrusion 4a provided in the side column of the housing | casing 4 among the deflection | deviation prevention structures of the sheet | seat 2 mentioned above is shown. FIG. 2 (a) is a view as seen from the front with the seat 2 attached to the casing 4 and the front cover 1 removed, and FIG. 2 (b) shows the engagement protrusion 4a and the engagement hole 2a. Fig. 2 (c) is an enlarged view of the main part of the right side portion of the seat 2 and the right side portion thereof.

図２（a）に示すように、左右の係合突起４ａと係合穴２ａは、筐体４の縦中心軸を対称軸にして左右対称の位置に、左右対称形状で形成されており、その高さ方向の位置は、筐体４の上辺寄りの位置となっている。次に、係合穴２ａと係合突起４ａの詳細な関わり形態について、図２（ｂ）および（ｃ）を参照して説明する。 As shown in FIG. 2 (a), the left and right engaging protrusions 4a and the engaging holes 2a are formed in a symmetrical shape at a symmetrical position with the longitudinal center axis of the housing 4 as a symmetrical axis. The position in the height direction is closer to the upper side of the housing 4. Next, a detailed relationship between the engagement hole 2a and the engagement protrusion 4a will be described with reference to FIGS. 2 (b) and 2 (c).

図２（ｂ）に示すように、シート２の図の左側の係合突起４ａはその係合断面が長方形を成し、その長軸が左下がりの向きになっている。そして、この係合突起４ａに係合している係合穴２ａは、係合突起４ａの前記係合断面の長方形より大きな長方形を成し、その長軸は前記係合断面の長方形の長軸に平行なものとなっている。この係合穴２ａを係合突起４ａに係合させた状態では、係合穴２ａの上側左下向きの斜辺が係合突起４ａの上側左下向きの斜面にぴったりと接するとともに、係合穴２ａと係合突起４ａが接しているのはこれらの斜辺の部分のみで、他の部分は全く接触のない状態となっている。 As shown in FIG. 2 (b), the engagement protrusion 4a on the left side of the drawing of the seat 2 has a rectangular cross section, and the major axis is directed downward to the left. And the engagement hole 2a engaged with this engagement protrusion 4a comprises a rectangle larger than the rectangle of the said engagement cross section of the engagement protrusion 4a, The long axis is the long axis of the rectangle of the said engagement cross section. It is parallel to. In a state where the engagement hole 2a is engaged with the engagement protrusion 4a, the upper left lower slope of the engagement hole 2a is in direct contact with the upper left lower slope of the engagement protrusion 4a, and the engagement hole 2a The engagement protrusions 4a are in contact only with these oblique sides, and the other portions are not in contact at all.

同様に、図の右側の係合突起４ａと係合穴２aについても、図２（ｃ）に示すように、前記左側のものとシート２の縦中心軸に対して左右対称の構成をなしており、係合突起４aと係合穴２aの長方形の長軸は右下がりの向きになっており、係合穴２ａの上側右下向きの斜辺が、係合突起４ａの図の上側右下向きの斜面にぴったりと接するとともに、係合穴２ａと係合突起４ａが接しているのはこれらの斜辺の部分のみで、他の部分は全く接触のない状態となっている。 Similarly, the engagement protrusions 4a and the engagement holes 2a on the right side of the figure have a symmetrical configuration with respect to the left side and the longitudinal center axis of the seat 2 as shown in FIG. 2 (c). In addition, the long axis of the rectangular shape of the engagement protrusion 4a and the engagement hole 2a is downwardly inclined, and the upper right downward slope of the engagement hole 2a is the upper right downward slope of the engagement protrusion 4a in the figure. The engaging hole 2a and the engaging protrusion 4a are in contact with each other only in the hypotenuse, and the other portions are not in contact at all.

以上のような係合突起４ａと係合穴２ａの形状およびシート設置時の互いの位置関係により、本実施例のシート２を、前記係合穴２ａを介して係合突起４ａに垂下すると、シート２が係合突起４ａに及ぼす自重ｇの反力は、シート２の係合穴２ａの上側外寄りの斜辺部のみにかかるようになっている。従って、左右それぞれの係合穴２ａにおいて、それが係合突起４ａから受ける反力の水平分力２ｈは全て外向きに向かうので、シート２は、それら左右の外向き水平分力２ｈにより、図２（ｄ）に示すように、その板面に沿って緊張状態が与えられるのである。図中、二点鎖線で示したのは、たわみのある状態のシートである。 Due to the shape of the engagement protrusion 4a and the engagement hole 2a as described above and the mutual positional relationship when the sheet is installed, when the sheet 2 of this embodiment is suspended on the engagement protrusion 4a through the engagement hole 2a, The reaction force of the own weight g exerted on the engagement protrusion 4a by the sheet 2 is applied only to the oblique side portion on the upper outer side of the engagement hole 2a of the sheet 2. Accordingly, in the left and right engagement holes 2a, the horizontal component force 2h of the reaction force received from the engagement protrusion 4a is all directed outward, so that the seat 2 is moved by the left and right outward horizontal component forces 2h. As shown in FIG. 2 (d), a tension state is given along the plate surface. In the figure, a two-dot chain line indicates a sheet in a flexible state.

本実施形態では、係合突起４ａと係合穴２ａを長方形にし、係合穴２ａの方を係合断面より大きな長方形にしたが、この係合突起４ａの係合断面や係合穴２ａの形状はこれらに限られるものではなく、例えば、図３（ａ）に示したように、係合穴２ａは長方形にして、係合突起４ａのほうは、その係合断面が前記係合穴の長方形に含まれるような大きさの円、すなわち、その直径が係合穴２ａの長方形の短辺より小さな値の円であってもよい。 In this embodiment, the engagement protrusion 4a and the engagement hole 2a are rectangular, and the engagement hole 2a is a rectangle larger than the engagement cross section. However, the engagement cross section of the engagement protrusion 4a and the engagement hole 2a The shapes are not limited to these. For example, as shown in FIG. 3A, the engagement hole 2a is rectangular, and the engagement protrusion 4a has an engagement cross section of the engagement hole. A circle having a size that is included in the rectangle, that is, a circle whose diameter is smaller than the short side of the rectangle of the engagement hole 2a may be used.

また、同じく、図３（ｂ）に示したように、係合穴２ａを長方形にした場合に、係合突起４ａとして、その係合断面が前記長方形の長辺と短辺より小さな値の長径と短径を有する楕円であってもよい。 Similarly, as shown in FIG. 3B, when the engagement hole 2a is rectangular, the engagement protrusion 4a has a long diameter whose engagement cross section is smaller than the long side and the short side of the rectangle. And an ellipse having a minor axis.

さらに、図３（ｃ）に示したように、係合穴２ａを三角形にして、係合突起４ａの係合断面がその三角形に含まれるような三角形にしてもよい。 Further, as shown in FIG. 3C, the engagement hole 2a may be a triangle, and the engagement cross section of the engagement protrusion 4a may be included in the triangle.

このように、係合穴２ａと係合突起４ａの係合断面の形状の組み合わせについては上記以外にも様々な態様があるが、いずれの場合も、本発明の目的であるところの、シート２のたるみを防止するには、前記したような条件を満たすことが肝要である。 As described above, there are various modes other than the above for the combination of the shapes of the engagement cross sections of the engagement holes 2a and the engagement protrusions 4a. In any case, the sheet 2 is the object of the present invention. In order to prevent the sagging, it is important to satisfy the above-mentioned conditions.

すなわち、左右の各係合穴２ａが、対応する各係合突起４ａの係合断面を隙間をもって含むとともに、少なくとも、シート２の縦中心軸に対して左のものは左下に、右のものは右下に向かう斜辺を有した形状を成し、各係合突起４ａは、シート２をそれに垂下した際、前記係合穴２ａに対し、係合穴２ａとの接触部位が係合穴２ａの斜辺部のみとなるような形状と位置関係を有していることである。 That is, the left and right engagement holes 2a include the engagement cross sections of the corresponding engagement protrusions 4a with a gap, and at least the left one with respect to the longitudinal center axis of the seat 2 is at the lower left, and the right one is Each engaging protrusion 4a has a shape having a hypotenuse toward the lower right, and when the seat 2 is suspended from the sheet 2, the contact portion of the engaging hole 2a with respect to the engaging hole 2a That is, it has a shape and a positional relationship such that only the hypotenuse.

そうでないと、例えば、図３（ｄ）に示したような長方形の係合穴２ａと長方形断面の係合突起４ａとが、その長手の斜辺とだけでなく、その隣の短辺とも接して、係合穴２ａが両辺によって支持される場合には、短辺で接触している部分では、その水平分力２h‘がシート２の内側に向かうようになり、外向きの水平分力を相殺して、その効果を大きく減衰させるからである。 Otherwise, for example, the rectangular engagement hole 2a and the engagement protrusion 4a having a rectangular cross section as shown in FIG. 3D are in contact with not only the long oblique side but also the adjacent short side. When the engagement hole 2a is supported by both sides, the horizontal component force 2h 'is directed toward the inside of the seat 2 at the portion contacting the short side, and the outward horizontal component force is canceled out. This is because the effect is greatly attenuated.

なお、本実施形態では、係合突起４aを筐体４の部分に設けたがこれを前カバー１（前カバー１の裏面側）に設ける構成にすることも可能である。 In the present embodiment, the engagement protrusion 4a is provided on the housing 4; however, it may be configured to be provided on the front cover 1 (the back side of the front cover 1).

以上より、本実施形態では、その本質的構成さえ満たしていれば、光補正シート２のたわみの防止を、係合突起４ａと係合穴２ａという簡単な構造で実現することができる。 As described above, in this embodiment, as long as the essential configuration is satisfied, prevention of the deflection of the light correction sheet 2 can be realized with a simple structure of the engagement protrusion 4a and the engagement hole 2a.

（第２の実施形態）
第２の実施形態では、前記第１の実施形態のシート２の係合穴２ａに替えて切り欠きを形成し、その切り欠きと、筐体４に形成した係止突起とで、シート２のたわみを防止しようとするものである。図４（a）に、その係止突起４ｂと切り欠き２ｂを有した筐体４とシート２を、それらを設置した状態で示す。また、図４（ｂ）にその係止突起４ｂと切り欠き２ｂとがかかわっている状態を部分拡大図で示す。 (Second Embodiment)
In the second embodiment, a notch is formed instead of the engagement hole 2a of the sheet 2 of the first embodiment, and the notch and the locking projection formed on the housing 4 It is intended to prevent deflection. FIG. 4A shows the housing 4 and the sheet 2 having the locking projection 4b and the notch 2b in a state where they are installed. FIG. 4B is a partially enlarged view showing a state in which the locking projection 4b and the notch 2b are involved.

先ず、図４（ａ）に示すように、係止突起４ｂは筐体４の下辺の前面に筐体４の縦軸を対称軸にして左右対称の位置に形成し、その筐体４の前面に平行な断面が長方形を成している。そして、その長方形断面の長手方向の軸が、筐体4の縦中心軸を対称軸にして、ハの字を成すような形で形成している。 First, as shown in FIG. 4A, the locking projection 4 b is formed on the front surface of the lower side of the housing 4 at a symmetrical position with the longitudinal axis of the housing 4 as the symmetry axis. The cross section parallel to is a rectangle. Then, the longitudinal axis of the rectangular cross section is formed in a shape that forms a letter C with the longitudinal center axis of the housing 4 as the axis of symmetry.

他方、シート２の切り欠き２ｂは、シート２の下縁の部分に、図４（ａ）に示したような形状で形成されており、図４（ｂ）に示すように、その斜辺の傾斜角αは、前記係止突起４ｂの長方形断面の長軸の傾角βと同じとなっている。また、その斜辺の部分は、前記係止突起４ｂの長方形断面の長辺より長い寸法となっており、シート２上の形成位置は、シート２を係止突起４ｂに係止させて垂下させた際、係止突起４ｂの図の上側の斜面が切り欠き２ｂの斜辺とのみ接するような形になっている。このような構成は、図の右側の切り欠き２ｂと係止突起４ｂとの関係においても同じである。 On the other hand, the notch 2b of the sheet 2 is formed in the lower edge portion of the sheet 2 in a shape as shown in FIG. 4A, and as shown in FIG. The angle α is the same as the inclination angle β of the long axis of the rectangular cross section of the locking projection 4b. Further, the oblique side portion is longer than the long side of the rectangular cross section of the locking projection 4b, and the formation position on the sheet 2 is suspended by the sheet 2 being locked to the locking projection 4b. At this time, the upper slope in the drawing of the locking projection 4b is in contact with only the oblique side of the notch 2b. Such a configuration is the same in the relationship between the notch 2b and the locking protrusion 4b on the right side of the drawing.

このような切り欠き２ｂと係止突起４ｂの形状、および、それらを取り付けた際の位置関係により、係止突起４ｂからの反力は全て切り欠き２ｂの斜辺の部分にのみかかるので、その反力の水平分力は左右それぞれの切り欠き２ｂにおいて全て外向きになり、シート２に、その板面に沿った緊張力を付与することになる。 Due to the shape of the notches 2b and the locking projections 4b and the positional relationship when they are attached, all the reaction force from the locking projections 4b is applied only to the hypotenuse of the notches 2b. The horizontal component of force is all outward in the left and right cutouts 2b, and tension is applied to the sheet 2 along the plate surface.

以上のように、本実施形態においても、前記第１の実施形態の場合と同様、シート２を、左右の切り欠き２ｂを介して左右の係止突起４ｂに係止させることにより、各係止突起４ｂから受ける反力の外向き水平分力によって、シート２はその板面に沿って緊張状態が発現されるようになっている。 As described above, also in the present embodiment, as in the case of the first embodiment, each sheet 2 is locked to the left and right locking protrusions 4b via the left and right cutouts 2b, whereby each locking is performed. Due to the outward horizontal component force of the reaction force received from the protrusion 4b, the sheet 2 is developed to be in tension along its plate surface.

この場合も、切り欠き形状と係止突起４ｂのシート板面に沿う断面形状との組み合わせについては、様々な態様があるが、肝要なのは、切り欠き２ｂが、少なくとも、シート２の縦中心軸に対して左のものは左下に、右のものは右下に向かう斜辺を有しており、各係止突起４ｂは、シート２をそれに係止した際、前記切り欠き２ｂに対し、切り欠き２ｂとの接触部位が前記斜辺部のみとなるような形状と位置関係を有していることである。 Also in this case, there are various modes for the combination of the notch shape and the cross-sectional shape along the sheet plate surface of the locking projection 4b, but the important thing is that the notch 2b is at least on the longitudinal center axis of the sheet 2. On the other hand, the left one has a hypotenuse that goes to the lower left and the right one goes to the lower right, and each locking projection 4b has a notch 2b relative to the notch 2b when the sheet 2 is locked thereto. And the contact portion has a shape and a positional relationship such that only the hypotenuse.

それは、例えば、前記第１の実施形態の場合と同様、係止突起４ｂが図４（ｃ）のような形状を成し、シート２の切り欠き２ｂをそれに係止させた際、切り欠き２ｂがその斜辺部と水平部とで支持されるようであれば、斜辺部のみで支持される場合のような水平分力が発生せず、シート２を緊張状態に保てないからである。 For example, as in the case of the first embodiment, the locking projection 4b has a shape as shown in FIG. 4C, and when the notch 2b of the sheet 2 is locked thereto, the notch 2b Is supported by the hypotenuse part and the horizontal part, the horizontal component force is not generated as in the case of being supported only by the hypotenuse part, and the seat 2 cannot be kept in tension.

以上のように、第２の実施形態も、前記第１の実施形態と同様、光補正シート２のたわみの防止を切り欠き２ｂと係止突起４ｂを設けるだけの簡単な構造で実現することができる。 As described above, in the second embodiment, similarly to the first embodiment, prevention of the deflection of the light correction sheet 2 can be realized with a simple structure in which only the notch 2b and the locking protrusion 4b are provided. it can.

（第３の実施形態）
第３の実施形態では、第１の実施形態の係合形状（係合穴と係合突起）が対の形で設けられていたのとは異なり、単独で設けられているものの例を挙げる。図５（ａ）に第３の実施形態の模式図を示す。なお、第１の実施形態と同じ仕様のものについては、同じ符号を付して説明する。 (Third embodiment)
In the third embodiment, unlike the first embodiment in which the engagement shapes (engagement holes and engagement protrusions) are provided in pairs, an example is provided in which the engagement shapes are provided independently. FIG. 5A shows a schematic diagram of the third embodiment. Note that components having the same specifications as those of the first embodiment will be described with the same reference numerals.

図５（ａ）は、筐体４にシート２を装着し、前カバー１を外した状態で正面から観た図である。本実施形態の場合、筐体４の図の左側辺の上縁寄りに断面真円の回転軸４ｃが紙面の背面側から手前側に向かって突設されている。また、筐体４の図の右側辺の上縁寄りに、第１の実施形態と同じ仕様の係合突起４ａが、これも紙面の背面側から手前側に向かって突設されている。 FIG. 5A is a view seen from the front with the seat 2 attached to the housing 4 and the front cover 1 removed. In the case of the present embodiment, a rotation shaft 4c having a perfect cross section is provided so as to protrude from the back side to the front side of the drawing near the upper edge of the left side of the housing 4 in the drawing. Further, an engaging protrusion 4a having the same specifications as that of the first embodiment is provided near the upper edge of the right side of the housing 4 in the drawing, and this also protrudes from the back side to the near side of the drawing.

以上のような形態の筐体４に対応して、光補正シート２には、それを筐体４に取り付ける場合に、その筐体４の回転軸に対応する位置には、筐体４側の回転軸より僅かに大きな直径の真円の係合穴２ｃが、また、係合突起４ａに対応する位置にはその係合突起４ａより大きな長方形の係合穴２ａが形成されており、この係合穴２ａは、前出の第１の実施形態の場合と同様、係合突起４ａの前記係合断面の長方形より大きな長方形を成し、その長軸は前記係合断面の長方形の長軸に平行なものとなっている。 Corresponding to the casing 4 having the above-described form, when the light correction sheet 2 is attached to the casing 4, the position corresponding to the rotation axis of the casing 4 is on the casing 4 side. A perfect engagement hole 2c having a diameter slightly larger than the rotation shaft is formed, and a rectangular engagement hole 2a larger than the engagement protrusion 4a is formed at a position corresponding to the engagement protrusion 4a. As in the case of the first embodiment, the joint hole 2a has a rectangular shape that is larger than the rectangular shape of the engaging cross section of the engaging protrusion 4a, and its long axis is the long axis of the rectangular shape of the engaging cross section. It is parallel.

そして、第１の実施形態と同様、この係合穴２ａを係合突起４ａに係合させた状態では、係合穴２ａの上側（右下向きの）斜辺が係合突起４ａの上側（右下向きの）斜面にぴったりと接するとともに、係合穴２ａと係合突起４ａが接しているのはこれらの斜辺の部分のみで、他の部分は全く接触のない状態となっている。 As in the first embodiment, when the engagement hole 2a is engaged with the engagement protrusion 4a, the upper side (downward to the right) of the engagement hole 2a is above the engagement protrusion 4a (downward to the right). The engaging hole 2a and the engaging projection 4a are in contact with only the oblique sides, and the other parts are in no contact at all.

従って、第３の実施形態における筐体４と光補正シート２にあっては、筐体４の係合突起４ａの上側斜辺に、筐体４の回転軸の中心と係合突起４ａの上側斜辺との最短距離にシートの自重を掛け合わせたモーメントが掛かり、シート２は、係合突起からこのモーメントの作用の反力を受け、その反力のシートの外向き（図の右向き）水平分力を受けて、その向きの緊張状態を得ることができる。 Therefore, in the case 4 and the light correction sheet 2 in the third embodiment, the upper oblique side of the engagement protrusion 4a of the case 4 and the upper oblique side of the rotation axis of the case 4 and the engagement protrusion 4a. The seat 2 receives a reaction force of the action of the moment from the engagement projection, and the reaction force is applied to the seat outward (rightward in the figure) by a horizontal component. And get a tension in that direction.

（第４の実施形態）
第４の実施形態では、前記第２の実施形態の係合形状（切り欠きと係止突起）が対の形で設けられていたのとは異なり、単独で設けられているものであって、前記第３の実施形態が、回転軸と、係合突起、係合穴との関係であったのに対し、回転軸と、係止突起、切り欠きとの関係のものを採り挙げる。図５（ｂ）に第４の実施形態の模式図を示す。なお、第２の実施形態、第３の実施形態と同じ仕様のものについては、同じ符号を付して説明する。 (Fourth embodiment)
In the fourth embodiment, unlike the second embodiment in which the engagement shape (notch and locking projection) is provided in a pair, it is provided alone, While the third embodiment has a relationship between the rotation shaft, the engagement protrusion, and the engagement hole, the relationship between the rotation shaft, the locking protrusion, and the notch is taken. FIG. 5B shows a schematic diagram of the fourth embodiment. The same specifications as those of the second embodiment and the third embodiment will be described with the same reference numerals.

図５（ｂ）は、筐体４にシート２を装着し、前カバー１を外した状態で正面から観た図である。本実施形態の場合、筐体４の図の左側辺の上縁寄りに第３の実施形態と同じ仕様の断面真円の回転軸４ｃが紙面の背面側から手前側に向かって突設されている。また、筐体４の図の右側辺寄り、かつ、下辺寄りに、第２の実施形態と同じ仕様の係止突起４ｂが、これも紙面の背面側から手前側に向かって突設されている。 FIG. 5B is a view seen from the front with the seat 2 attached to the housing 4 and the front cover 1 removed. In the case of the present embodiment, a rotating shaft 4c having a perfect cross section having the same specifications as that of the third embodiment is provided near the upper edge of the left side of the housing 4 in the drawing so as to project from the back side to the near side. Yes. Further, a locking projection 4b having the same specification as that of the second embodiment is provided near the right side and the lower side of the housing 4 in the drawing so as to project from the back side to the near side. .

以上のような形態の筐体４に対応して、光補正シート２には、それを筐体４に取り付ける場合に、その筐体４の回転軸に対応する位置には、第３の実施形態と同じ仕様の、筐体４側の回転軸４ｃより僅かに大きな直径の真円の係合穴２ｃが、また、係止突起４ｃに対応する位置には、第２の実施形態と同じ仕様の切り欠き２ｂが設けられている。 Corresponding to the case 4 having the above-described form, when the light correction sheet 2 is attached to the case 4, the position corresponding to the rotation axis of the case 4 is located at the third embodiment. The circular engagement hole 2c having a diameter slightly larger than the rotation shaft 4c on the housing 4 side and the position corresponding to the locking projection 4c is the same as that of the second embodiment. A notch 2b is provided.

その切り欠き２ｂの斜辺の部分は、前記係止突起４ｂの長方形断面の長辺より長い寸法となっており、シート２の左上隅の係合穴２ｃを筐体４の回転軸４ｃに回転可能に係合させ、切り欠き２ｂを係止突起４ｂに係止させて垂下させた際、係止突起４ｂの図の上側の斜面が切り欠き２ｂの斜辺とのみ接するような形になっている。 The oblique side portion of the notch 2b is longer than the long side of the rectangular cross section of the locking projection 4b, and the engagement hole 2c in the upper left corner of the seat 2 can be rotated around the rotation shaft 4c of the housing 4. When the notch 2b is engaged with the locking projection 4b and suspended, the upper slope of the locking projection 4b is in contact with only the oblique side of the notch 2b.

従って、第４の実施形態における筐体４と光補正シート２にあっても、筐体４の係止突起４ｂの上側斜辺に、筐体４の回転軸４ｃの中心と切り欠き２ｂの斜辺との最短距離にシートの自重を掛け合わせたモーメントが掛かり、シート２は、係止突起４ｂからこのモーメントの作用の反力を受け、その反力のシート２の外向き（図の右向き）の水平分力を受けて、緊張状態を得ることができる。 Therefore, even in the case 4 and the light correction sheet 2 in the fourth embodiment, the upper oblique side of the locking projection 4b of the case 4 and the oblique side of the notch 2b and the center of the rotation shaft 4c of the case 4 are provided. A moment obtained by multiplying the weight of the sheet by the shortest distance of the sheet 2 is applied, and the sheet 2 receives a reaction force of the action of the moment from the locking projection 4b, and the sheet 2 of the reaction force is directed outward (rightward in the figure) Receive tension and get tension.

この発明は光補正シートを有する面状照明装置のその光補正シートのたわみの防止対策全般に利用できる。 The present invention can be used for all the measures for preventing the deflection of the light correction sheet of the planar illumination device having the light correction sheet.

は、本発明の実施形態における共通構造を示す分解斜視図である。These are exploded perspective views which show the common structure in embodiment of this invention. は、（ａ）に、第１の実施形態におけるシートを筐体に装着した状態を正面図で示し、（ｂ）、（ｃ）に（ａ）の要部拡大図を示したものである。また、（ｄ）は本発明の効果を示す図である。(A) is a front view showing a state in which the seat according to the first embodiment is mounted on the housing, and (b) and (c) are enlarged views of the main part of (a). Moreover, (d) is a figure which shows the effect of this invention. は、（ａ）、（ｂ）、（ｃ）に第１の実施形態の変形例を示し、（ｄ）に、第１の実施形態を実施する際の肝要事項を要部拡大図で示したものである。(A), (b), (c) shows a modification of the first embodiment, and (d) shows an essential part enlarged view of the essential part when the first embodiment is implemented. Is. は、（ａ）に、本発明の第２の実施形態における光補正シートを筐体に装着した状態を正面図で示し、（ｂ）に（ａ）の要部拡大図を示したものである。(A) is a front view showing a state in which the light correction sheet according to the second embodiment of the present invention is mounted on the housing, and (b) is an enlarged view of the main part of (a). . は、（ａ）に第３の実施形態を、（ｂ）に第４の実施形態を、それぞれ正面図で模式的に示したものである。FIG. 6A is a front view schematically showing the third embodiment in FIG. 5A and FIG. 4B is a fourth embodiment in FIG.

Explanation of symbols

１前カバー
２光補正シート
２ａ係合穴
２ｂ切り欠き
２ｃ係合穴
３面状発光部
３ａ棒状ランプ
４筐体
４ａ係合突起
４ｂ係止突起
４ｃ回転軸 DESCRIPTION OF SYMBOLS 1 Front cover 2 Light correction sheet | seat 2a Engagement hole 2b Notch 2c Engagement hole 3 Planar light emission part 3a Bar-shaped lamp 4 Case 4a Engagement protrusion 4b Locking protrusion 4c Rotating shaft

Claims

In the planar lighting device in which the light correction sheet is installed on the front surface of the planar light emitting unit,
A pair of engaging protrusions projecting in the front-rear direction of the display device are provided at left and right positions of the rectangular housing for housing the light emitting unit and the light correction sheet or the cover thereof, and the light correction sheet is When the housing is installed in the housing, a pair of engagement holes are formed at positions corresponding to the engagement protrusions, and the engagement holes are suspended from the engagement protrusions. The shape of each of the left and right engagement holes has at least a hypotenuse that goes to the lower left and the right one to the lower right with respect to the longitudinal center axis of the sheet, and the corresponding engagement protrusions are engaged. The engaging projection has a shape including a cross section with a gap, and when the light correction sheet is suspended by engaging the engaging hole with the engaging hole, the contact portion with the engaging hole is the engaging hole. The planar lighting device has a shape and a positional relationship such that only the oblique side portion of Deflection prevention structure of an optical compensation sheet in.

In the planar lighting device in which the light correction sheet is installed on the front surface of the planar light emitting unit,
A pair of locking protrusions projecting in the front-rear direction of the lighting device are provided on the left and right sides of the rectangular housing for housing the light emitting unit and the light correction sheet or the lower side of the cover, and the light correction sheet is Is formed at a position corresponding to the locking projection, and the notch is locked to the locking projection at the left and right sides. Each notch has at least a hypotenuse on the left with respect to the longitudinal center axis of the sheet, and the right one has a hypotenuse toward the lower right. A planar illumination having a shape and a positional relationship such that when the notch is locked and the light correction sheet is suspended, a contact portion with the notch is only the oblique side portion of the notch. Structure for preventing deflection of light correction sheet in apparatus.

In the planar lighting device in which the light correction sheet is installed on the front surface of the planar light emitting unit,
A rotating shaft along the front-rear direction of the lighting device is located closer to one of the left and right sides of the rectangular housing or the cover for housing the light emitting unit and the light correction sheet, and the other side is directed to the front-rear direction of the lighting device. Engaging protrusions project, and when the light correction sheet is installed on the casing or its cover, a position corresponding to the rotation axis of the light correction sheet is supported rotatably around the rotation axis. When the light correction sheet is installed in the housing or its cover in a state of being engaged, an engagement hole is formed at a position corresponding to the engagement protrusion, and the engagement protrusion is formed in the engagement hole portion. The shape of the engagement hole is at least the lower left when it is formed on the left with respect to the longitudinal center axis of the sheet, and the lower right when it is formed on the right. A corresponding engaging protrusion having a hypotenuse The engagement projection has a shape including a clearance, and the engagement protrusion is engaged with the engagement hole when the engagement hole is engaged and the light correction sheet is suspended. A structure for preventing deflection of a light correction sheet in a planar illumination device, having a positional relationship with a shape such that only the oblique side portion of the joint hole is formed.

In the planar lighting device in which the light correction sheet is installed on the front surface of the planar light emitting unit,
A rotation axis along the front-rear direction of the lighting device toward one of the right and left sides of the rectangular housing or the cover for housing the light emitting unit and the light correction sheet, and the front-rear direction of the lighting device on the lower side near the other A locking projection is provided so as to be able to rotate around the rotation axis of the light correction sheet when the light correction sheet is installed on the casing or its cover. When installed on the casing or its cover in a supported state, a notch is formed at a position corresponding to the locking projection, and the notch is locked to the locking projection. The cutout has at least a hypotenuse on the lower left when it is formed on the left with respect to the longitudinal central axis of the sheet, and on the lower right when it is formed on the right. The locking protrusion is formed in the notch. In addition, when the light correction sheet is suspended while the notch is locked, the contact portion with the notch has a shape and a positional relationship such that only the oblique side portion of the notch is provided. Structure for preventing deflection of a light correction sheet in a planar illumination device.

A transmissive liquid crystal display device having a planar illumination device provided with the light correction sheet deflection prevention structure according to claim 1 in a backlight.