JP5653576B2 - Optical function member - Google Patents

Optical function member Download PDF

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JP5653576B2
JP5653576B2 JP2008175003A JP2008175003A JP5653576B2 JP 5653576 B2 JP5653576 B2 JP 5653576B2 JP 2008175003 A JP2008175003 A JP 2008175003A JP 2008175003 A JP2008175003 A JP 2008175003A JP 5653576 B2 JP5653576 B2 JP 5653576B2
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light guide
sheet
guide layer
light
hole
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JP2010015833A (en
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服部　聡
聡 服部
智幸 青垣
智幸 青垣
充 倉田
充 倉田
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Furukawa Electric Co Ltd
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Description

本発明は、液晶ディスプレイ等のバックライトユニットや、照明装置に用いられる面光源装置において、照明光路制御に使用される光学機能部材に関する。   The present invention relates to an optical functional member used for illumination light path control in a backlight unit such as a liquid crystal display or a surface light source device used in an illumination device.

ＬＣＤ用バックライトや照明装置においては、エッジ部に設けられた光源と、光源からの光を面発光に変える平板状の導光部材（導光板又は導光フィルムともいう）とを有する面光源装置が用いられている。面光源装置としては、光源からの光を導光部材の平板面から均一に且つ効率よく面発光させるために、レンズシートや光拡散シートを備えたものが知られている。通常は、レンズシートや光拡散シートを導光部材上に重ねて載置され、これにより、導光部材に入射した光をシートと垂直な方向に転向させている。   In an LCD backlight or lighting device, a surface light source device having a light source provided at an edge portion and a flat light guide member (also referred to as a light guide plate or a light guide film) that converts light from the light source into surface light emission Is used. As the surface light source device, there is known a surface light source device including a lens sheet and a light diffusion sheet in order to uniformly and efficiently emit light from the light source from the flat plate surface of the light guide member. Usually, a lens sheet or a light diffusing sheet is placed on the light guide member so that light incident on the light guide member is turned in a direction perpendicular to the sheet.

近年では、上記レンズシートや光拡散シートなどの光学部品の数を減らすために、或いは、面光源装置を薄型化するために、導光部材に光転向機能を付加した構成が考案されている。   In recent years, in order to reduce the number of optical components such as the lens sheet and the light diffusion sheet, or to reduce the thickness of the surface light source device, a configuration in which a light turning function is added to the light guide member has been devised.

例えば、特許文献１には、図１１（ａ）に示すように、発光ダイオードを有する光源５０と、導光体５１と、支持フィルム５３上に複数のレンズ５４がアレイ状に形成されたレンズシート５２と、反射膜５６とを備えた面光源装置が開示されている。特許文献１では、各レンズ５４の平坦な頂部５４ａを導光体５１に貼り付けることで、導光体５１とレンズシート５２とが一体化されている。このような構成では、図１１（ｂ）に示すように、導光体５１の側面から入射した光は、導光体５１の上面と下面との間で空気との屈折率差による全反射を繰り返しながら伝搬し、レンズ５４を介して上向きに転向される。   For example, in Patent Document 1, as shown in FIG. 11A, a light source 50 having a light emitting diode, a light guide 51, and a lens sheet in which a plurality of lenses 54 are formed in an array on a support film 53. 52, a surface light source device including a reflective film 56 is disclosed. In Patent Document 1, the light guide 51 and the lens sheet 52 are integrated by attaching the flat top 54 a of each lens 54 to the light guide 51. In such a configuration, as shown in FIG. 11B, the light incident from the side surface of the light guide 51 is totally reflected by the difference in refractive index with air between the upper surface and the lower surface of the light guide 51. It propagates repeatedly and is turned upward through the lens 54.

また、特許文献２では、図１２に示すように、光源６０と、導光体６１と、基材層６３表面に接着剤層６６を介して接着された複数のマイクロプリズム６４からなるレンズシート６２とを有するバックライト装置が開示されている。このような構成においても、図示のように、導光体６１の側面から入射した光は、導光体６１と空気との屈折率差による全反射を繰り返しながら伝搬し、マイクロプリズム６４を介して上向きに転向される。   In Patent Document 2, as shown in FIG. 12, a lens sheet 62 including a light source 60, a light guide 61, and a plurality of microprisms 64 bonded to the surface of a base material layer 63 via an adhesive layer 66. A backlight device is disclosed. Even in such a configuration, as shown in the figure, the light incident from the side surface of the light guide 61 propagates while repeating total reflection due to the refractive index difference between the light guide 61 and air, and passes through the microprism 64. Turned upward.

平板状の導光部材とレンズシートとを一体化する方法としては、例えば、特許文献１に記載されているように、フィルム状の導光部材（以下、導光フィルムという）を用いて、導光フィルムのロールとレンズシートのロールとを連続的に送り出し、両者を貼り合わせた後に巻き取るという、ロール・ツー・ロールプロセスで作成することが試みられている。
特許第３８２６１４５号公報 米国特許第５，３９６，３５０号公報 As a method for integrating the flat light guide member and the lens sheet, for example, as described in Patent Document 1, a film light guide member (hereinafter referred to as a light guide film) is used to guide the flat light guide member and the lens sheet. Attempts have been made to create a roll-to-roll process in which a roll of an optical film and a roll of a lens sheet are continuously fed out and then wound together.
Japanese Patent No. 3826145 US Pat. No. 5,396,350

上記のような導光部材に光転向機能を付加した光学機能部材においては、導光部材として、透明樹脂フィルムなどの柔軟で薄くて軽い材料を用いることで屈曲可能に構成されたものが知られている。このような光学機能部材は、自由に曲げることができるので、面光源装置及びそれを備える液晶表示装置の設計自由度を高めることができる。   In the optical functional member in which the light turning function is added to the light guide member as described above, the light guide member is configured to be bent by using a flexible, thin and light material such as a transparent resin film. ing. Since such an optical functional member can be freely bent, the degree of freedom in designing the surface light source device and the liquid crystal display device including the surface light source device can be increased.

しかしながら、屈曲可能な光学機能部材を曲げた状態で使用する場合には、平坦な状態で使用する場合に比べ、空気に対する屈折率差をより大きいものにする必要があるが、一般にはそのような導光フィルムを得ることができず、図１３に示すように、導光フィルム５１内を伝搬される光が導光フィルム５１と空気との界面から必要でない方向に出射してしまい、出射面全体から均一に光が出射することができず、面全体からの出射光の均一性が著しく悪化する。   However, when using a bendable optical functional member in a bent state, it is necessary to make the refractive index difference with respect to air larger than when using it in a flat state. The light guide film cannot be obtained, and as shown in FIG. 13, the light propagating through the light guide film 51 is emitted in an unnecessary direction from the interface between the light guide film 51 and the air, and the entire emission surface Thus, the light cannot be emitted uniformly, and the uniformity of the emitted light from the entire surface is significantly deteriorated.

そこで、本発明の目的は、曲げた状態で使用する場合にも、出射面全体からの出射光の均一性に優れる光学機能部材を提供することにある。   Accordingly, an object of the present invention is to provide an optical functional member that is excellent in the uniformity of the emitted light from the entire emission surface even when used in a bent state.

本発明の第１の態様は、光透過性材料からなる導光層と、厚さ方向に貫通孔が形成され、該貫通孔の側面にも反射性能を有する、前記導光層の第１の面側に設けられた反射シートと、前記導光層の第１の面とは反対の第２の面側に設けられた反射部材とを有することを特徴とする光学機能部材である。   According to a first aspect of the present invention, there is provided a light guide layer made of a light transmissive material and a first hole of the light guide layer in which a through hole is formed in a thickness direction and the side surface of the through hole also has a reflection performance. An optical functional member comprising: a reflective sheet provided on a surface side; and a reflective member provided on a second surface side opposite to the first surface of the light guide layer.

本発明の第２の態様は、前記第１の態様にかかる光学機能部材において、前記導光層、前記反射シート、及び前記反射部材の合計の厚さが、７００μｍ以下であることを特徴とする。   According to a second aspect of the present invention, in the optical functional member according to the first aspect, a total thickness of the light guide layer, the reflective sheet, and the reflective member is 700 μm or less. .

本発明の第３の態様は、前記第１又は第２の態様にかかる光学機能部材において、前記貫通孔の側面は、前記導光層の前記第１の面に向かって該貫通穴の断面積が小さくなるような傾斜面を有することを特徴とする。   According to a third aspect of the present invention, in the optical functional member according to the first or second aspect, a side surface of the through hole is a cross-sectional area of the through hole toward the first surface of the light guide layer. It has the inclined surface which becomes small.

本発明の第４の態様は、前記第１から第３のいずれかの態様にかかる光学機能部材において、前記反射シートは、両面反射シートであることを特徴とする。   According to a fourth aspect of the present invention, in the optical functional member according to any one of the first to third aspects, the reflective sheet is a double-sided reflective sheet.

本発明の第５の態様は、前記第１から第４のいずれかの態様にかかる光学機能部材において、前記貫通孔の側面は、拡散反射性能を有することを特徴とする。   According to a fifth aspect of the present invention, in the optical functional member according to any one of the first to fourth aspects, the side surface of the through hole has diffuse reflection performance.

本発明の第６の態様は、前記第１から第５のいずれかの態様にかかる光学機能部材において、前記導光層と前記反射シートとの間に、透明粘接着剤層が介在することを特徴とする。   According to a sixth aspect of the present invention, in the optical functional member according to any one of the first to fifth aspects, a transparent adhesive layer is interposed between the light guide layer and the reflective sheet. It is characterized by.

本発明の光学機能部材によれば、光学機能部材を曲げた状態で使用する場合においても、平坦な状態で使用する場合と同程度の正面輝度及び輝度分布を得ることができる。すなわち、従来の光学機能部材においては、導光層内に入射した光が、導光層と空気との屈折率差による全反射を利用して伝搬され、レンズ等を介して出射されるのに対し、本発明の光学機能部材においては、導光層内に入射した光が、導光層の第１の面側に設けられた反射シートと第２の面側に設けられた反射部材との間で高反射率で反射しながら伝搬され、反射シートに形成された貫通孔に入射した光が、反射性能を有する貫通孔の側面で反射して出射される。このため、光学機能部材を曲げた状態で使用する場合においても、導光層から必要でない部分へ出射することがなく、出射光のムラを防止し、平坦な状態で使用する場合と同程度の正面輝度及び輝度分布を得ることができる。   According to the optical functional member of the present invention, even when the optical functional member is used in a bent state, it is possible to obtain the same front luminance and luminance distribution as when used in a flat state. That is, in the conventional optical functional member, the light that has entered the light guide layer is propagated using total reflection due to the refractive index difference between the light guide layer and air, and is emitted through a lens or the like. On the other hand, in the optical functional member of the present invention, the light incident on the light guide layer is formed by the reflection sheet provided on the first surface side of the light guide layer and the reflection member provided on the second surface side. The light that is propagated while being reflected with high reflectivity between the two and is incident on the through-hole formed in the reflection sheet is reflected and emitted from the side surface of the through-hole having the reflection performance. For this reason, even when the optical functional member is used in a bent state, the light is not emitted from the light guide layer to an unnecessary portion, and unevenness of the emitted light is prevented, which is the same as when used in a flat state. Frontal luminance and luminance distribution can be obtained.

以下に本発明の実施の形態を図面に基づいて詳細に説明する。
図１は、本発明の実施形態にかかる光学機能部材１０を示す断面図である。光学機能部材１０は、光透過性材料からなる導光層１１と、導光層１１の第１の面１１ａ側に設けられた反射シート１２と、導光層１１の第１の面１１ａとは反対の第２の面１１ｂ側に設けられた反射部材１５とを有している。反射シート１２は、厚さ方向に形成された複数の貫通孔１３を有しており、これら貫通孔１３の側面１４も反射性能を有している。
以下、各構成部材について詳細に説明する。 Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an optical functional member 10 according to an embodiment of the present invention. The optical function member 10 includes a light guide layer 11 made of a light transmissive material, a reflection sheet 12 provided on the first surface 11 a side of the light guide layer 11, and a first surface 11 a of the light guide layer 11. And a reflecting member 15 provided on the opposite second surface 11b side. The reflection sheet 12 has a plurality of through-holes 13 formed in the thickness direction, and the side surfaces 14 of these through-holes 13 also have reflection performance.
Hereinafter, each component will be described in detail.

＜導光層＞
導光層１１は、図１に示すように、光源に面して配置される光入射面１１ｃから遠ざかるに従って厚みが減少するテーパー部と、平板状の導光本体部とを有している。このような構成によれば、光入射面１１ｃが広いので、光源からの光を効率よく入射することができるとともに、面光源装置の薄型化に寄与することができる。 <Light guide layer>
As shown in FIG. 1, the light guide layer 11 includes a tapered portion whose thickness decreases as the distance from the light incident surface 11 c disposed facing the light source increases, and a flat light guide body portion. According to such a configuration, since the light incident surface 11c is wide, the light from the light source can be efficiently incident, and the surface light source device can be made thinner.

導光層１１の構成材料としては、自由に曲げることができる光透過性材料を用いることができ、例えば、ポリカーボネイト、ポリ塩化ビニル、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリプロピレン、ポリメチルメタクリレートなどの透明樹脂フィルムが挙げられる。   As a constituent material of the light guide layer 11, a light transmissive material that can be freely bent can be used. For example, transparent resin such as polycarbonate, polyvinyl chloride, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polymethyl methacrylate, and the like. A film is mentioned.

導光層１１の厚さは、特に限定されず、例えば４００μｍ以下の薄い導光層を採用することができるが、１００μｍよりも薄いものが屈曲性に優れるため好ましい。
また、屈曲性および薄型軽量化の観点からは、導光層１１、反射シート１２、及び反射部材１５の合計の厚さが７００μｍ以下であることが好ましい。 The thickness of the light guide layer 11 is not particularly limited, and for example, a thin light guide layer having a thickness of 400 μm or less can be employed. However, a thickness of less than 100 μm is preferable because it has excellent flexibility.
Further, from the viewpoint of flexibility and reduction in thickness and weight, the total thickness of the light guide layer 11, the reflection sheet 12, and the reflection member 15 is preferably 700 μm or less.

＜反射シート＞
反射シート１２は、図１に示すように、厚さ方向に形成された複数の貫通孔１３を有している。貫通孔１３は、上述のように、その側面にも反射性能を有している。
このような貫通孔１３の側面にも反射性能を有する反射シート１２としては、
（１）多数の微細気泡を有する樹脂シートに打ち抜き加工を施すことにより形成され、シートの表裏面及び打ち抜き孔の側面に反射性能を有するもの、
（２）打ち抜き加工を施された樹脂シートを、微細発泡処理することにより形成され、シートの表裏面及び打ち抜き孔の側面に反射性能を有するもの、
（３）金属板に打ち抜き加工を施すことにより、シートの表裏面及び打ち抜き孔の側面に反射性能を付与したもの、
（４）打ち抜き加工が施された樹脂シートに銀などの金属を蒸着あるいはスパッタリングすることにより金属膜を形成し、樹脂シートの片面及び打ち抜き孔の側面に反射性能を付与したもの
などを例示することができる。 <Reflection sheet>
As shown in FIG. 1, the reflection sheet 12 has a plurality of through holes 13 formed in the thickness direction. As described above, the through hole 13 also has reflection performance on its side surface.
As the reflection sheet 12 having reflection performance also on the side surface of such a through-hole 13,
(1) It is formed by punching a resin sheet having a large number of fine bubbles, and has reflection performance on the front and back surfaces of the sheet and the side surfaces of the punched holes,
(2) A resin sheet that has been punched is formed by fine foaming treatment, and has a reflective performance on the front and back surfaces of the sheet and the side surface of the punched hole,
(3) By giving a punching process to the metal plate, the front and back surfaces of the sheet and the side surface of the punched hole are provided with reflective performance,
(4) Exemplifying a metal sheet formed by vapor deposition or sputtering of a metal such as silver on a punched resin sheet, and having reflection performance on one side of the resin sheet and the side of the punched hole. Can do.

これらのうち、上記（１）及び（２）の反射シートを用いる場合には、貫通孔１３の側面１４に拡散反射性能を付与することができるので、面発光の輝度ムラの低減に効果的である。また、上記（１）〜（３）の反射シートは、いずれも両面反射シートであることから、太陽光や室内光の外光が反射シート１２の上面で反射することで輝度を上げることに効果的である。また、外光反射効果で十分な輝度が得られる際には、導光層へ光導入する光源への投入電力量を減らす、あるいは止めることもできるため省エネにも効果的である。
特に両面反射シートは白色であることが好ましい。 Among these, when the reflection sheets of (1) and (2) are used, the diffuse reflection performance can be imparted to the side surface 14 of the through-hole 13, which is effective for reducing luminance unevenness of surface emission. is there. Moreover, since the reflection sheets of (1) to (3) are all double-sided reflection sheets, the effect of increasing the brightness by reflecting sunlight or the outside light of room light on the upper surface of the reflection sheet 12 is effective. Is. In addition, when sufficient luminance is obtained by the external light reflection effect, the amount of power input to the light source for introducing light into the light guide layer can be reduced or stopped, which is effective for energy saving.
In particular, the double-sided reflective sheet is preferably white.

反射シート１２の厚さは、特に限定されないが、屈曲性の観点からは、５０〜６９０μｍ程度であることが好ましく、また、上述のように、導光層１１、反射シート１２、及び反射部材１５の合計の厚さが７００μｍ以下であることが好ましい。   The thickness of the reflection sheet 12 is not particularly limited, but is preferably about 50 to 690 μm from the viewpoint of flexibility, and as described above, the light guide layer 11, the reflection sheet 12, and the reflection member 15. The total thickness is preferably 700 μm or less.

最終的に出てくる光を本光学機能部材から垂直な方向の光として、正面輝度を上げるためには厚さ方向に貫通していればよく、垂直であっても、斜めに傾いていてもよい。さらに正面輝度を上げるためには、貫通孔１３の側面１４は、導光層１１の第１の面１１ａに向かって貫通孔１３の断面積が小さくなるような傾斜面であることが好ましい。側面１４の傾斜角度、すなわち、導光層１１の第１の面１１ａと垂直な線に対する傾斜角θは、特に限定されないが、２０°〜４０°程度であることが好ましい。このように貫通孔１３の側面１４が傾斜面を有することで、導光層１１から出る光が貫通孔１３の側面１４で反射させて本光学機能部材に垂直な光へと転向できる。   In order to increase the front luminance, the light finally emitted from the optical functional member may be penetrated in the thickness direction in order to increase the front brightness, whether vertical or inclined. Good. In order to further increase the front luminance, the side surface 14 of the through-hole 13 is preferably an inclined surface such that the cross-sectional area of the through-hole 13 decreases toward the first surface 11 a of the light guide layer 11. The tilt angle θ of the side surface 14, that is, the tilt angle θ with respect to a line perpendicular to the first surface 11 a of the light guide layer 11 is not particularly limited, but is preferably about 20 ° to 40 °. As described above, since the side surface 14 of the through hole 13 has the inclined surface, the light emitted from the light guide layer 11 is reflected by the side surface 14 of the through hole 13 and can be turned to light perpendicular to the optical functional member.

貫通孔１３の導光層１１側の孔径については特に限定されず、例えば１０〜１００μｍ程度であることが好ましい。また、貫通孔１３の平均ピッチについても特に限定されず、例えば３０〜２００μｍ程度であることが好ましい。特に貫通孔の形状は円形に限定されず楕円形や矩形でもよく、またひとつの形状ではなく、複数の形状の組み合わせでも良い。   The diameter of the through hole 13 on the light guide layer 11 side is not particularly limited, and is preferably about 10 to 100 μm, for example. Moreover, it does not specifically limit about the average pitch of the through-hole 13, For example, it is preferable that it is about 30-200 micrometers. In particular, the shape of the through hole is not limited to a circle, and may be an ellipse or a rectangle, and may be a combination of a plurality of shapes instead of a single shape.

反射シート１２を導光層１１に貼り合わせる方法としては、導光層１１の第１の面１１ａ上に透明粘着剤層を設け、この粘着剤層を介して、両者を貼り合わせる方法を採用することができる。粘着剤層としては、例えば、熱、あるいは紫外線等の放射線を照射することにより硬化する刺激硬化型粘着剤を好適に使用することができる。   As a method of bonding the reflective sheet 12 to the light guide layer 11, a method is adopted in which a transparent adhesive layer is provided on the first surface 11a of the light guide layer 11, and the both are bonded via this adhesive layer. be able to. As the pressure-sensitive adhesive layer, for example, a stimulus curable pressure-sensitive adhesive that is cured by irradiation with heat or radiation such as ultraviolet rays can be suitably used.

＜反射部材＞
反射部材１５としては、一般的な反射フィルムを用いることができ、例えば、ポリエチレンテレフタレート（ＰＥＴ）フィルムに酸化チタン等のフィラー、気泡などを内填した白色ＰＥＴフィルムや、ＰＥＴ等の樹脂フィルムに銀などの金属を蒸着あるいはスパッタリングすることにより金属反射膜を形成した反射フィルムなどを使用することができる。ＰＥＴ等の樹脂フィルムに金属反射膜を形成した場合には、樹脂フィルムを導光層として機能させ、金属反射膜を反射部材として機能させることができる。 <Reflection member>
As the reflecting member 15, a general reflecting film can be used. For example, a white PET film in which a polyethylene terephthalate (PET) film is filled with a filler such as titanium oxide and bubbles, or a resin film such as PET is silver. A reflective film in which a metal reflective film is formed by vapor deposition or sputtering of a metal such as can be used. When a metal reflection film is formed on a resin film such as PET, the resin film can function as a light guide layer, and the metal reflection film can function as a reflection member.

なお、導光層１１、反射シート１２、及び反射部材１５の合計の厚さは、７００μｍ以下であることが好ましい。   In addition, it is preferable that the total thickness of the light guide layer 11, the reflective sheet 12, and the reflective member 15 is 700 μm or less.

上記構成の光学機能部材１０を曲げた状態で使用する場合、図２に示すように、導光層１１内に入射した光は、導光層１１の第１の面１１ａ側に設けられた反射シート１２と第２の面１１ｂ側に設けられた反射部材１５との間で高反射率で反射しながら伝搬され、反射シート１２に形成された貫通孔１３に入射した光が、反射性能を有する貫通孔１３の側面１４で反射して出射される。   When the optical function member 10 having the above configuration is used in a bent state, as shown in FIG. 2, the light incident on the light guide layer 11 is reflected on the first surface 11 a side of the light guide layer 11. Light that propagates while reflecting with high reflectivity between the sheet 12 and the reflecting member 15 provided on the second surface 11b side and enters the through-hole 13 formed in the reflecting sheet 12 has reflection performance. The light is reflected by the side surface 14 of the through hole 13 and emitted.

従来の光学機能部材においては、導光層内に入射した光が、導光層と空気との屈折率差による全反射を利用して伝搬されるのに対し、本発明の光学機能部材においては、反射シート１２と反射部材１５との間で高反射率で反射しながら伝搬されるので、光学機能部材１０を曲げた状態で使用する場合においても、導光層から必要でない部分へ出射することがない。また、光学機能部材１０を曲げた状態では、導光層１１の樹脂は曲率に合わせて伸縮し、樹脂の密度が増減するので、導光層１１内での光の相対的な進行位置は、平坦な状態で使用する場合と比べて殆ど変化しない。さらに、貫通孔１３においては、反射シート１２の曲率に合わせて外部側の孔径は、導光層１１側の孔径よりも大きくなるので、貫通孔１３に入射した光が側面１４で反射して外部へ出射される光の出射面（第１の面）１１ａの垂線に対する出射角度及び光の量は、平坦な状態と曲げた状態とでほとんど変化しない。これらの結果、光学機能部材１０を曲げた状態で使用する場合でも、出射光のムラを防止し、平坦な状態で使用する場合と同程度の正面輝度及び輝度分布を得ることができる。   In the conventional optical functional member, light incident on the light guide layer is propagated using total reflection due to the refractive index difference between the light guide layer and air, whereas in the optical functional member of the present invention, Since it propagates while reflecting with high reflectivity between the reflection sheet 12 and the reflection member 15, even when the optical function member 10 is used in a bent state, it is emitted from the light guide layer to an unnecessary portion. There is no. Further, in a state where the optical functional member 10 is bent, the resin of the light guide layer 11 expands and contracts according to the curvature, and the density of the resin increases or decreases. Therefore, the relative traveling position of the light within the light guide layer 11 is There is almost no change compared to the case of using in a flat state. Further, in the through hole 13, the hole diameter on the outside side is larger than the hole diameter on the light guide layer 11 side in accordance with the curvature of the reflection sheet 12, so that the light incident on the through hole 13 is reflected by the side surface 14 and externally The emission angle and the amount of light with respect to the normal of the emission surface (first surface) 11a of the light emitted to the surface hardly change between the flat state and the bent state. As a result, even when the optical functional member 10 is used in a bent state, unevenness of the emitted light can be prevented and the front luminance and luminance distribution comparable to those when used in a flat state can be obtained.

以下に、本発明を実施例に基づいてさらに詳細に説明するが、本発明はこれら実施例に限定されるものではない。   Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

（実施例１）
以下のようにして、図３に示す実施例１の光学機能部材２０を形成した。
導光層１１として厚さ５０μｍの透明ポリエチレンテレフタレート（ＰＥＴ）フィルムを用い、このＰＥＴフィルムの片面に銀を蒸着して、反射部材１５としての厚さ１μｍの反射層を形成した。次いで、ＰＥＴフィルムのもう一方の面に熱硬化型透明粘着剤層１６を１０μｍの厚みで塗工し、その上に、貫通孔１３が形成された厚さ５００μｍの反射シート１２を貼りあわせた。その後、熱硬化型粘着層を硬化させて、長さ４０ｍｍの実施例１の光学機能部材２０を完成させた。反射シート１３は、多数の微細気泡を有する樹脂シートに打ち抜き加工を施すことにより形成され、シートの表裏面だけでなく、打ち抜き孔の側面に反射性能を有するものである。貫通孔１３の粘着剤層１６側の孔径は５０μｍ、貫通孔１３の側面１４の傾斜角度θ１は、導光層１１の第１の面１１ａの垂線に対して３５度であり、貫通孔１３の平均ピッチは約２００μｍである。 Example 1
The optical functional member 20 of Example 1 shown in FIG. 3 was formed as follows.
A transparent polyethylene terephthalate (PET) film having a thickness of 50 μm was used as the light guide layer 11, and silver was deposited on one surface of the PET film to form a reflective layer having a thickness of 1 μm as the reflecting member 15. Next, the thermosetting transparent pressure-sensitive adhesive layer 16 was applied to the other surface of the PET film with a thickness of 10 μm, and the reflective sheet 12 with a thickness of 500 μm on which the through holes 13 were formed was bonded thereto. Thereafter, the thermosetting pressure-sensitive adhesive layer was cured to complete the optical functional member 20 of Example 1 having a length of 40 mm. The reflection sheet 13 is formed by punching a resin sheet having a large number of fine bubbles, and has reflection performance not only on the front and back surfaces of the sheet but also on the side surfaces of the punch holes. The diameter of the through-hole 13 on the pressure-sensitive adhesive layer 16 side is 50 μm, and the inclination angle θ 1 of the side surface 14 of the through-hole 13 is 35 degrees with respect to the perpendicular of the first surface 11 a of the light guide layer 11. The average pitch is about 200 μm.

実施例１の光学機能部材２０のエッジから、ＬＥＤを用いて光を入れたときの、出光面１１ａの正面輝度の長さ方向分布を、図３に示すような平坦な状態と、図４に示すような曲率半径１００ｍｍで曲げた状態とでそれぞれ測定した。結果を図５及び図６に示す。   When the light is introduced from the edge of the optical functional member 20 of Example 1 using the LED, the distribution of the front luminance of the light exit surface 11a in the length direction is as shown in FIG. Measurements were made with a curvature radius of 100 mm as shown. The results are shown in FIGS.

（比較例１）
以下のようにして、図７に示す比較例１の光学機能部材３０を形成した。
導光層１１として厚さ５０μｍの透明ＰＥＴフィルムを用い、このＰＥＴフィルムの片面に銀を蒸着して、反射部材１５としての厚さ１μｍの反射層を形成した。次いで、ＰＥＴフィルムのもう一方の面に熱硬化型透明粘着剤層１６を１０μｍの厚みで塗工し、その上に、厚さ２００μｍのレンズシート３１を貼り合わせた。その後、熱硬化型粘着層を硬化させて、長さ４０ｍｍの比較例１の光学機能部材３０を完成させた。レンズシート３１は、厚さ１５０μｍの透明ＰＥＴ基材３２上に高さ５０μｍの単位レンズ３３が複数形成されたものである。単位レンズ３３の幅は、粘着剤層側で５０μｍ、レンズ側壁の傾斜角度θ２は、導光層１１の第１の面１１ａの垂線に対して３５度であり、レンズの平均ピッチは約１００μｍである。 (Comparative Example 1)
The optical functional member 30 of the comparative example 1 shown in FIG. 7 was formed as follows.
A transparent PET film having a thickness of 50 μm was used as the light guide layer 11, and silver was vapor-deposited on one surface of the PET film to form a reflective layer having a thickness of 1 μm as the reflecting member 15. Next, the thermosetting transparent pressure-sensitive adhesive layer 16 was applied to the other surface of the PET film with a thickness of 10 μm, and a lens sheet 31 with a thickness of 200 μm was bonded thereon. Thereafter, the thermosetting pressure-sensitive adhesive layer was cured to complete the optical functional member 30 of Comparative Example 1 having a length of 40 mm. The lens sheet 31 is formed by forming a plurality of unit lenses 33 having a height of 50 μm on a transparent PET substrate 32 having a thickness of 150 μm. The width of the unit lens 33 is 50 μm on the adhesive layer side, the inclination angle θ 2 of the lens side wall is 35 degrees with respect to the normal to the first surface 11a of the light guide layer 11, and the average pitch of the lenses is about 100 μm. It is.

比較例１の光学機能部材３０のエッジから、ＬＥＤを用いて光を入れたときの、出光面１１ａの正面輝度の長さ方向分布を、図７に示すような平坦な状態と、図８に示すような曲率半径１００ｍｍで曲げた状態とでそれぞれ測定した。結果を図９及び図１０に示す。   When the light is input from the edge of the optical functional member 30 of Comparative Example 1 using an LED, the front luminance of the light exit surface 11a in the longitudinal direction is shown in FIG. Measurements were made with a curvature radius of 100 mm as shown. The results are shown in FIGS.

図５，６，９，１０の結果から明らかなように、本発明の光学機能部材においては、曲げた状態で用いる場合でも、平坦な状態で使用する場合と同程度の正面輝度及び輝度分布を得ることできた。   As is apparent from the results of FIGS. 5, 6, 9, and 10, the optical functional member of the present invention has the same front luminance and luminance distribution as when used in a flat state even when used in a bent state. I was able to get it.

本発明の一実施形態にかかる光学機能部材を示す断面図である。It is sectional drawing which shows the optical function member concerning one Embodiment of this invention. 図１に示す光学機能部材の曲げた状態を示す断面図である。It is sectional drawing which shows the state which the optical function member shown in FIG. 1 bent. 実施例１の光学機能部材を示す断面図である。FIG. 3 is a cross-sectional view illustrating an optical functional member of Example 1. 図３に示す光学機能部材の曲げた状態を示す断面図である。It is sectional drawing which shows the state which the optical function member shown in FIG. 3 bent. 平坦な状態の実施例１の光学機能部材について、長さ方向の正面輝度分布を示すグラフである。It is a graph which shows the front luminance distribution of a length direction about the optical function member of Example 1 of a flat state. 曲げた状態の実施例１の光学機能部材について、長さ方向の正面輝度分布を示すグラフである。It is a graph which shows the front luminance distribution of the length direction about the optical function member of Example 1 of the bent state. 比較例１の光学機能部材を示す断面図である。6 is a cross-sectional view showing an optical function member of Comparative Example 1. FIG. 図７に示す光学機能部材の曲げた状態を示す断面図である。It is sectional drawing which shows the state which the optical function member shown in FIG. 7 bent. 平坦な状態の比較例１の光学機能部材について、長さ方向の正面輝度分布を示すグラフである。It is a graph which shows the front luminance distribution of a length direction about the optical function member of the comparative example 1 of a flat state. 曲げた状態の比較例１の光学機能部材について、長さ方向の正面輝度分布を示すグラフである。It is a graph which shows the front luminance distribution of the length direction about the optical function member of the comparative example 1 of the bent state. 従来の光学機能部材の例を示す断面図である。It is sectional drawing which shows the example of the conventional optical function member. 従来の光学機能部材の他の例を示す断面図である。It is sectional drawing which shows the other example of the conventional optical function member. 従来の光学機能部材の不具合を説明するための図である。It is a figure for demonstrating the malfunction of the conventional optical function member.

符号の説明Explanation of symbols

１０ 光学機能部材
１１ 導光層
１１ａ 第１の面
１１ｂ 第２の面
１２ 反射シート
１３ 貫通孔
１４ 貫通孔の側面
１５ 反射部材
１６ 粘着剤層
DESCRIPTION OF SYMBOLS 10 Optical function member 11 Light guide layer 11a 1st surface 11b 2nd surface 12 Reflective sheet 13 Through-hole 14 Side surface of through-hole 15 Reflective member 16 Adhesive layer

Claims (3)

光透過性材料からなる導光層と、
厚さ方向に貫通孔が形成され、該貫通孔の側面にも反射性能を有する、前記導光層の第１の面側に設けられた反射シートと、
前記導光層の第１の面とは反対の第２の面側に設けられた反射部材と、
を備え、
前記導光層は、光源に面して配置される光入射面から遠ざかるに従って厚みが減少するテーパー部と、平板状の導光本体部とを有しており、
前記反射シートは、多数の微細気泡を有する樹脂シートに打ち抜き加工を施して前記貫通孔を形成したシート、または、打ち抜き加工により前記貫通孔が形成された樹脂シートに微細発泡処理をしたシートであって、表裏面に反射性能を有し、前記貫通孔の側面に拡散反射性能を有するシートであり、
前記貫通孔の側面は、前記導光層の前記第１の面に向かって当該貫通孔の断面積が小さくなる傾斜面であり、前記導光層の前記第１の面と垂直な線に対する当該側面の傾斜角度が２０°以上４０°以下となるように形成されていることを特徴とする光学機能部材。 A light guide layer made of a light transmissive material;
A reflection sheet provided on the first surface side of the light guide layer, wherein a through hole is formed in the thickness direction, and the side surface of the through hole has a reflection performance;
A reflecting member provided on the second surface side opposite to the first surface of the light guide layer;
With
The light guide layer has a tapered portion whose thickness decreases as the distance from the light incident surface arranged facing the light source decreases, and a flat light guide body portion,
The reflective sheet is a sheet in which a through-hole is formed by punching a resin sheet having a large number of fine bubbles, or a sheet in which a fine foaming process is performed on a resin sheet in which the through-hole is formed by punching. And a sheet having reflection performance on the front and back surfaces, and having diffuse reflection performance on the side surface of the through hole,
The side surface of the through-hole is an inclined surface in which the cross-sectional area of the through-hole decreases toward the first surface of the light guide layer, and the side surface is perpendicular to the line perpendicular to the first surface of the light guide layer. An optical functional member, wherein the side surface has an inclination angle of 20 ° to 40 °. 前記導光層、前記反射シート、及び前記反射部材の合計の厚さが、７００μｍ以下であることを特徴とする請求項１に記載の光学機能部材。   2. The optical functional member according to claim 1, wherein a total thickness of the light guide layer, the reflective sheet, and the reflective member is 700 μm or less. 前記導光層と前記反射シートとの間に、透明粘接着剤層が介在することを特徴とする請求項１または２に記載の光学機能部材。


The optical functional member according to claim 1 or 2 between the reflecting sheet and the light guide layer, a transparent adhesive layer, characterized in that the interposed.


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JP2014232156A (en) * 2013-05-28 2014-12-11 コニカミノルタ株式会社 Reflection member and surface light emission unit
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