JPH08203312A - Lighting system - Google Patents
Lighting systemInfo
- Publication number
- JPH08203312A JPH08203312A JP7008847A JP884795A JPH08203312A JP H08203312 A JPH08203312 A JP H08203312A JP 7008847 A JP7008847 A JP 7008847A JP 884795 A JP884795 A JP 884795A JP H08203312 A JPH08203312 A JP H08203312A
- Authority
- JP
- Japan
- Prior art keywords
- transparent plate
- lighting device
- light source
- light
- pitch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、展示物、室内空間の照
明その他各種の照明に用いることのできる照明装置に係
わり、特に、液晶表示素子のバックライトとして好適す
る照明装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device which can be used for various kinds of lighting such as lighting for exhibitions and indoor spaces, and more particularly to a lighting device suitable as a backlight for a liquid crystal display device.
【０００２】[0002]
【従来の技術】従来から、液晶表示素子のバックライト
として、透明板の一側端または対向する各側端に配設し
た光源から透明板に光を入射して、入射方向と直角の方
向の面から光を出射する照明方法が知られている（特公
平２−１６５５０４号公報）。この方法は光の利用効率
が低いため、液晶表示素子のバックライトとして使用す
るためには、光源の輝度を上げなければならない。2. Description of the Related Art Conventionally, as a backlight of a liquid crystal display device, light is incident on a transparent plate from a light source arranged at one end of the transparent plate or at each of opposite side ends thereof, and the light is emitted in a direction perpendicular to the incident direction. An illumination method of emitting light from a surface is known (Japanese Patent Publication No. 2-165504). Since this method has low light utilization efficiency, the brightness of the light source must be increased in order to use it as a backlight of a liquid crystal display device.
【０００３】しかしながら、光源の輝度を上げると消費
電力が大きくなってしまい、このため電池駆動がし難く
なり、装置も大きくなって液晶表示素子の薄型化、軽量
化の目的に合致しなくなり、さらに、部品点数が多くな
り製造方法も複雑になって製造コストが高くなるという
問題があった。However, if the brightness of the light source is increased, the power consumption becomes large, which makes it difficult to drive the battery, and the device becomes large, which is not suitable for the purpose of making the liquid crystal display element thinner and lighter. However, there is a problem that the number of parts is increased, the manufacturing method is complicated, and the manufacturing cost is increased.
【０００４】[0004]
【発明が解決しようとする課題】前述したように、従来
の平板状の透明板の一側端から光を入射させて一方の面
から出射させる形式の照明装置では、光の利用効率が低
く、明るさを増すために光源の輝度を上げると、電池駆
動がし難くなり、また、装置が大きくなって液晶表示装
置の薄型化、軽量化の目的に沿わなくなり、さらに、部
品点数が多くなり製造方法も複雑になって製造コストが
高くなるという問題があった。As described above, in the conventional illuminating device of the type in which light is made incident from one side end of the flat plate-like transparent plate and is emitted from one side, the utilization efficiency of light is low, When the brightness of the light source is increased to increase the brightness, it becomes difficult to drive the battery, and the size of the device becomes too large to meet the purpose of making the liquid crystal display device thinner and lighter. There is a problem that the method is complicated and the manufacturing cost is high.
【０００５】このような方式の照明装置の光の利用効率
が低い原因の一つは、透明板に入るときの光の入射角度
が、出射面や反射面に対して浅いために全反射してしま
う成分が多く、また出射する光の中にも浅い角度で出射
する成分が多いため、正面に向かう成分が少なくなるた
めであると考えられる。One of the causes of low light utilization efficiency of the illuminating device of this type is that the incident angle of light entering the transparent plate is shallow with respect to the emitting surface and the reflecting surface, so that total reflection occurs. It is considered that this is because many of the components are emitted, and many components of the emitted light are emitted at a shallow angle, so that the components directed to the front are reduced.
【０００６】本発明は、かかる点に着目してなされたも
ので、透明板に入射した光の内、出射面から正面方向に
向かう光の量を多くした照明装置を提供することを目的
とするものである。The present invention has been made in view of such a point, and an object thereof is to provide an illuminating device in which a large amount of light, which is incident on the transparent plate, is directed from the emission surface toward the front direction. It is a thing.
【０００７】[0007]
【課題を解決するための手段】本発明の照明装置は、透
明板の一方の面を平行した凸条を形成した出射面とし、
他方の面を多数のドットを形成した反射面とするととも
に前記透明板の一側端または対向する各側端の近傍に光
源を配置して、前記光源から前記透明板に入射した光が
前記出射面から出射するように構成したことを特徴とす
る。According to another aspect of the present invention, there is provided an illuminating device, wherein one surface of a transparent plate is an emitting surface having parallel ridges.
The other surface is used as a reflecting surface having a large number of dots, and a light source is arranged near one side edge of the transparent plate or in the vicinity of each side edge, and the light incident on the transparent plate from the light source is emitted. It is characterized in that the light is emitted from the surface.
【０００８】本発明で用いる透明板としては、単板状の
ものに限らず、複数の透明板を積層したものであっても
よい。このような透明板の一方の面に平行した凸条を形
成して出射面とし、他方の面に光を散乱する多数のドッ
トを形成して反射面とする。透明板に用いる透明プラス
チックとしては、アクリル樹脂、メタクリル樹脂、ポリ
カーボネート、スチレン樹脂、アクリル−スチレン共重
合体などの透明樹脂が例示される。The transparent plate used in the present invention is not limited to a single plate, but may be a stack of a plurality of transparent plates. A ridge parallel to one surface of such a transparent plate is formed as an emission surface, and a large number of dots that scatter light are formed on the other surface as a reflection surface. Examples of the transparent plastic used for the transparent plate include transparent resins such as acrylic resin, methacrylic resin, polycarbonate, styrene resin, and acrylic-styrene copolymer.
【０００９】金型成形時に光の出射面の反対側の反射面
で反射された散乱光を前面方位に揃えるために平行した
多数の凸条を形成する。A large number of parallel ridges are formed in order to align the scattered light reflected by the reflecting surface on the opposite side of the light emitting surface during the molding of the mold in the front direction.
【００１０】本発明の照明装置の透明板の出射面に形成
される凸条は、断面Ｖ字状又は逆Ｕ字状のものが基本で
あるが、光の散乱を起こさせるものであれば上記の形状
に限定されるものではない。The ridges formed on the emission surface of the transparent plate of the illumination device of the present invention are basically V-shaped or inverted U-shaped in cross section. The shape is not limited to.
【００１１】図２および図３は、本発明の透明板１の凸
条の形状を模式的に示したもので、図２は透明プラスチ
ックの出射面側に断面逆Ｖ字状の凸条２ａが形成される
ように金型で一体成形してなる透明板１を示しており、
図３は透明プラスチックの出射面側に断面逆Ｕ字状の凸
条２ｂが形成されるように金型で一体成形してなる透明
板１を示している。なお、図４に示すように、これらの
平行する凸条２ａ（または２ｂ）と直交させて別の凸条
（２ｃ）を形成するようにしてもよい。2 and 3 schematically show the shape of the ridges of the transparent plate 1 of the present invention. In FIG. 2, the ridges 2a having an inverted V-shaped cross section are provided on the emission surface side of the transparent plastic. 1 shows a transparent plate 1 integrally formed by a mold so as to be formed,
FIG. 3 shows a transparent plate 1 integrally formed by a metal mold so that a convex strip 2b having an inverted U-shaped cross section is formed on the emission surface side of the transparent plastic. Note that, as shown in FIG. 4, another ridge (2c) may be formed orthogonal to these parallel ridges 2a (or 2b).
【００１２】凸条の開き角度は、好ましくは50°から 1
50°の範囲である。このましい凸条は、半径が10μｍか
ら30μｍの範囲の円弧状のものである。これらの凸条
は、液晶表示素子のマトリックス状の画素構造との干渉
作用によりモアレ干渉縞が発生するのを避けるため、図
５に示すように、透明板１の光源の配置された側端Ａに
対して 0°から20°（特に 1°から20°）傾斜させて形
成することが望ましい。透明板の出射面と反対側の面
（反射面）には、この面へ当たった光を乱反射させるた
めに、１μｍから 1ｍｍの白色のドットを形成しておく
ことが望ましい。白色のドットの形成は、成形により表
面に形成する方法、白色インクをスクリーン印刷で形成
する方法、光硬化樹脂を表面に付着して硬化させる方法
などを用いることができる。液晶表示素子の照明に用い
る場合には、液晶表示素子の 1画素の大きさより小さく
することが望ましい。The opening angle of the ridges is preferably 50 ° to 1
It is in the range of 50 °. This preferable ridge has an arc shape with a radius of 10 μm to 30 μm. In order to prevent the moire interference fringes from being generated due to the interference with the matrix-like pixel structure of the liquid crystal display element, these ridges are arranged on the side edge A of the transparent plate 1 where the light source is arranged, as shown in FIG. It is desirable to form it with an inclination of 0 ° to 20 ° (especially 1 ° to 20 °). It is desirable to form white dots of 1 μm to 1 mm on the surface (reflection surface) of the transparent plate on the side opposite to the emission surface in order to diffusely reflect the light impinging on this surface. The white dots can be formed by a method of forming on the surface by molding, a method of forming white ink by screen printing, a method of adhering a photo-curable resin to the surface and curing it. When used for illuminating a liquid crystal display device, it is desirable to make the size smaller than one pixel of the liquid crystal display device.
【００１３】また、このような白色ドットに代えて、反
射面に多数の凹溝を形成するようにしてもよい。凹溝の
形状、配列、ピッチ等は透明板の出射面側に形成される
凸条と同様である。図６は、このような凹溝３の例を示
すもので、（ａ）は逆Ｖ字状、（ｂ）は矩形状、（ｃ）
は逆Ｕ字状、（ｄ）はエッジ状の凹溝を示している。ま
た、反射面の細溝を平行に配列する方向は出射面の細溝
と直交させることが望ましい。この凹溝は、開き角度が
50°から 150°の範囲にあることが望ましい。凸条や凹
溝のピッチは、 1μｍから 1ｍｍの範囲で選択すること
が望ましい。1 ｍｍより大きいと均一面が得られなくな
り、 1μｍより小さいと加工が困難になる上に輝度の向
上効果が得にくくなるので好ましくない。なお、液晶表
示素子の照明に用いる場合には、液晶表示素子の 1画素
の大きさより小さくすることが望ましい。通常、細溝の
ピッチは10μｍから 300μｍの範囲で選択される。Further, instead of such white dots, a large number of concave grooves may be formed on the reflecting surface. The shape, arrangement, pitch, etc. of the concave grooves are the same as those of the convex stripes formed on the exit surface side of the transparent plate. FIG. 6 shows an example of such a concave groove 3, (a) is an inverted V shape, (b) is a rectangular shape, (c).
Shows an inverted U-shape, and (d) shows an edge-shaped concave groove. Further, it is desirable that the direction in which the narrow grooves on the reflecting surface are arranged in parallel be orthogonal to the narrow grooves on the emitting surface. The opening angle of this groove is
It is desirable to be in the range of 50 ° to 150 °. It is desirable to select the pitch of the ridges and grooves in the range of 1 μm to 1 mm. If it is larger than 1 mm, a uniform surface cannot be obtained, and if it is smaller than 1 μm, processing becomes difficult and the effect of improving the brightness becomes difficult to obtain, which is not preferable. When used for illumination of a liquid crystal display element, it is desirable to make the size smaller than one pixel of the liquid crystal display element. Usually, the pitch of the fine grooves is selected in the range of 10 μm to 300 μm.
【００１４】透明板に入射した光は、入射方向に進行す
るにつれて出射していく光の分だけ減衰していく。した
がって、透明板の全面の輝度を均一にするためには、光
源からの距離に応じて反射面の反射性能を変えていく必
要がある。The light incident on the transparent plate is attenuated by the amount of the light emitted as it advances in the incident direction. Therefore, in order to make the brightness of the entire surface of the transparent plate uniform, it is necessary to change the reflection performance of the reflection surface according to the distance from the light source.
【００１５】この目的を達成するためには、反射面に白
色のドットを形成した場合には、光源側から遠ざかるに
つれてドットの大きさを徐々に大きくなるようにし、凹
溝を形成する場合には、図７に示すように、凹溝３の溝
の深さを光源側Ｌから遠ざかるにつれて深くするか、又
は図８に示すように、凹溝３の溝のピッチを密にするよ
うにすればよい。また、透明板自体の厚さを、光源側か
ら遠ざかるにつれて薄くなるようにしてもよい。透明板
自体の厚さを、光源側から遠ざかるにつれて薄くする方
法としては、図９に示すように、光源側Ｌから遠ざかる
につれて直線的に薄くする方法や、図１０に示すよう
に、凸状の曲線に沿って薄くする方法や、図１１に示す
ように、凹状の曲線に沿って薄くする方法をとることが
できる。To achieve this object, when a white dot is formed on the reflecting surface, the size of the dot is gradually increased as it goes away from the light source side, and when a concave groove is formed. As shown in FIG. 7, if the groove depth of the concave groove 3 is made deeper as the distance from the light source side L is increased, or the groove pitch of the concave groove 3 is made fine as shown in FIG. Good. Further, the thickness of the transparent plate itself may be reduced as the distance from the light source side increases. As a method of reducing the thickness of the transparent plate itself as it moves away from the light source side, as shown in FIG. 9, a method of linearly decreasing the distance from the light source side L or a convex shape as shown in FIG. A method of thinning along a curved line or a method of thinning along a concave curve as shown in FIG. 11 can be used.
【００１６】[0016]
【作用】本発明の照明装置では、光源から出射された光
は透明板の側端から透明板内に導入され、透明板内を平
面に沿って進行しながら表面部分で散乱された後に反射
面によって乱反射され、散乱光となって透明板の出射面
側に向かう。透明板の出射面側に向かった散乱光のう
ち、従来の平面状の表面のものでは透明板内に反射され
て戻されていた浅い角度の光も凸条の部分で出射面の前
方側に反射され、結果的に出射面の前方に出射されるの
で、照明装置としての輝度は大幅に改善される。In the illuminating device of the present invention, the light emitted from the light source is introduced into the transparent plate from the side edge of the transparent plate, is scattered along the plane of the transparent plate while being scattered by the surface portion, and then is reflected by the reflecting surface. Is diffusely reflected by the light to be scattered light and travels toward the exit surface side of the transparent plate. Of the scattered light that went to the exit surface side of the transparent plate, the light with a shallow angle that was reflected back inside the transparent plate with the conventional flat surface surface is also projected to the front side of the exit surface at the convex part. Since the light is reflected and, as a result, emitted toward the front of the emission surface, the brightness of the illumination device is greatly improved.
【００１７】[0017]
【実施例】次に本発明の実施例を図面に基づいて説明す
る。Embodiments of the present invention will now be described with reference to the drawings.
【００１８】実施例１ 図１は、本発明の照明装置を公知の液晶表示装置の照明
に用いた実施例を模式的に示す図である。 Embodiment 1 FIG. 1 is a diagram schematically showing an embodiment in which the illuminating device of the present invention is used for illuminating a known liquid crystal display device.
【００１９】図１において、符号１はメタクリレート樹
脂（旭化成製：デルペット８０）で形成された透明板を
示している。この透明板１の一方の面には多数の凸条２
ａが形成されて光の出射面Ｓを構成し、他方の面には多
数のドット４が形成されて反射面Ｒを構成している。In FIG. 1, reference numeral 1 indicates a transparent plate made of a methacrylate resin (Delpet 80 manufactured by Asahi Kasei). A large number of ridges 2 are formed on one surface of the transparent plate 1.
a is formed to form a light emission surface S, and a large number of dots 4 are formed on the other surface to form a reflection surface R.
【００２０】透明板１の出射面Ｓ上には液晶基板５が配
置され、反射面１ｂ上には散乱シート６が配置されてい
る。また、透明板１の一側端には蛍光灯、ハロゲンラン
プ等からなる棒状の光源７が配置され、その外側には放
物鏡８が配置されている。A liquid crystal substrate 5 is arranged on the emitting surface S of the transparent plate 1, and a scattering sheet 6 is arranged on the reflecting surface 1b. A rod-shaped light source 7 made of a fluorescent lamp, a halogen lamp or the like is arranged at one end of the transparent plate 1, and a parabolic mirror 8 is arranged outside the rod-shaped light source 7.
【００２１】この実施例の透明板１は、金型を用いて射
出成型により一体成形したものであり、出射面側にピッ
チ70μｍ、開き角度90°の逆Ｖ字状の凸条２ａが形成さ
れている。この透明板１の反射面側に形成された白色の
ドット４は、白色インク（セイコーアドバンス製＃２５
００）を用いてスクリーン印刷により形成したものであ
る。この実施例の照明装置の明るさを評価したところ、
2200ｌｘ／ｃｍ2 であった。The transparent plate 1 of this embodiment is integrally molded by injection molding using a mold, and an inverted V-shaped convex strip 2a having a pitch of 70 μm and an opening angle of 90 ° is formed on the emitting surface side. ing. White dots 4 formed on the reflective surface side of the transparent plate 1 are white ink (# 25 manufactured by Seiko Advance Co., Ltd.).
00) to be formed by screen printing. When the brightness of the lighting device of this example was evaluated,
It was 2200 lx / cm 2 .
【００２２】実施例２ 図１に示した照明装置における透明板１として、メタク
リレート樹脂（旭化成製：デルペット８０）製の透明板
の出射面側に、ピッチ100 μｍ、半径20μｍの図３に示
した逆Ｕ字状の多数の凸条２ｂが多数平行して形成され
るように、射出成型により一体成形したものを使用し
た。また、その反射面側には微小なドットを白色インク
（セイコーアドバンス製＃２５００）を用いてスクリー
ン印刷により形成した。このような透明板１を用いて、
実施例１と同様な照明装置を作製した。この実施例の照
明装置の明るさを評価したところ、2000ｌｘ／ｃｍ2 で
あった。 Example 2 As a transparent plate 1 in the illuminating device shown in FIG. 1, a transparent plate made of a methacrylate resin (Asahi Kasei: Delpet 80) is shown in FIG. 3 with a pitch of 100 μm and a radius of 20 μm on the emitting surface side. In addition, a product integrally formed by injection molding was used so that a large number of inverted U-shaped projections 2b were formed in parallel. In addition, fine dots were formed on the reflective surface side by screen printing using white ink (Seiko Advance # 2500). With such a transparent plate 1,
An illumination device similar to that in Example 1 was manufactured. When the brightness of the illumination device of this example was evaluated, it was 2000 lx / cm 2 .
【００２３】実施例３ 図１に示した照明装置における透明板１として、メタク
リレート樹脂（屈折率ε＝1.49、旭化成製：デルペット
８０）製の透明板の出射面側に、ピッチ70μｍ、開き角
度90°の図２に示した逆Ｖ字状の凸条２ａが多数平行し
て形成されるように、射出成型により一体成形したもの
を使用した。また、その反射面側には、微小なドットを
白色インク（セイコーアドバンス製＃２５００）を用い
てスクリーン印刷した。このような透明板１を用いて、
実施例１と同様な照明装置を作製した。この実施例の照
明装置の明るさを評価したところ、2000ｌｘ／ｃｍ2 で
あった。 Example 3 As the transparent plate 1 in the illuminating device shown in FIG. 1, a transparent plate made of a methacrylate resin (refractive index ε = 1.49, manufactured by Asahi Kasei: Delpet 80) has a pitch of 70 μm and an opening angle on the emitting surface side. An integrally molded article was used by injection molding so that a large number of inverted V-shaped convex strips 2a at 90 ° shown in FIG. 2 were formed in parallel. On the reflective surface side, fine dots were screen-printed using white ink (Seiko Advance # 2500). With such a transparent plate 1,
An illumination device similar to that in Example 1 was manufactured. When the brightness of the illumination device of this example was evaluated, it was 2000 lx / cm 2 .
【００２４】実施例４ 図１に示した照明装置における透明板１として、メタク
リレート樹脂（旭化成製：デルペット８０）製の透明板
の出射面側に、ピッチ70μｍ、開き角度90°の図２に示
した多数の逆Ｖ字状の凸条２ａを平行させたものが互い
に直交して形成されるように、射出成型により一体成形
したものを使用した。また、その反射面側には微小なド
ットを白色インク（セイコーアドバンス製＃２５００）
を用いてスクリーン印刷した。このような透明板１を用
いて、実施例１と同様な照明装置を作製した。この実施
例の照明装置の明るさを評価したところ、2300ｌｘ／ｃ
ｍ2 であった。 Example 4 As the transparent plate 1 in the illuminating device shown in FIG. 1, a transparent plate made of a methacrylate resin (Asahi Kasei: Delpet 80) was used as shown in FIG. 2 with a pitch of 70 μm and an opening angle of 90 ° on the emitting surface side. An integrally molded article was used by injection molding so that a large number of the inverted V-shaped projections 2a shown in FIG. In addition, white ink (Seiko Advance # 2500) with small dots on the reflective surface side
Was used for screen printing. Using the transparent plate 1 as described above, an illumination device similar to that in Example 1 was manufactured. When the brightness of the lighting device of this example was evaluated, it was 2300 lx / c.
m 2 .
【００２５】実施例５ 図１に示した照明装置における透明板１として、メタク
リレート樹脂（旭化成製：デルペット８０）製の透明板
の出射面側にピッチ70μｍ、開き角度90°の図２に示し
た多数の逆Ｖ字状の凸条２ａが多数平行して形成される
とともに、反射面側にはピッチ 235μｍ、開き角度90°
の図６（ａ）に示したＶ字状の細溝３ａが光源に対して
平行に形成されるように、射出成型により一体成形した
ものを使用した。このような透明板１を用いて、実施例
１と同様な照明装置を作製した。この実施例の照明装置
の明るさを評価したところ、2400ｌｘ／ｃｍ2 であっ
た。実施例６ 図１に示した照明装置における透明板１として、メタク
リレート樹脂（旭化成製：デルペット８０）製の透明板
の出射面側にピッチ70μｍ、開き角度90°の図２に示し
た多数の逆Ｖ字状の凸条２ａが多数平行して形成される
とともに、反射面側にはピッチ 235μｍ、開き角度90°
の図６（ａ）に示したＶ字状の細溝３ａが形成され、か
つ図９（ａ）に示したように光源側から遠ざかるほど透
明板の厚みが徐々に薄くなるように、射出成型により一
体成形したものを使用した。このような透明板１を用い
て、実施例１と同様な照明装置を作製した。この実施例
の照明装置の明るさを評価したところ、2100ｌｘ／ｃｍ
2 であった。 Example 5 As the transparent plate 1 in the illuminating device shown in FIG. 1, a transparent plate made of a methacrylate resin (Asahi Kasei: Delpet 80) has a pitch of 70 μm and an opening angle of 90 ° on the emitting surface side. In addition, a large number of inverted V-shaped ridges 2a are formed in parallel with each other, and the reflecting surface has a pitch of 235 μm and an opening angle of 90 °.
6 (a) was formed by injection molding so that the V-shaped narrow groove 3a was formed in parallel with the light source. Using the transparent plate 1 as described above, an illumination device similar to that in Example 1 was manufactured. When the brightness of the lighting device of this example was evaluated, it was 2400 lx / cm 2 . Example 6 As the transparent plate 1 in the illuminating device shown in FIG. 1, a transparent plate made of a methacrylate resin (Delpet 80 manufactured by Asahi Kasei Corp.) was used. A large number of inverted V-shaped ridges 2a are formed in parallel, and a pitch of 235 μm and an opening angle of 90 ° on the reflecting surface side.
6A, the V-shaped thin groove 3a is formed, and as shown in FIG. 9A, the transparent plate is gradually thinned as it is further away from the light source side. The one integrally molded by Using the transparent plate 1 as described above, an illumination device similar to that in Example 1 was manufactured. When the brightness of the lighting device of this example was evaluated, it was 2100 lx / cm.
Was 2 .
【００２６】比較例１ メタクリレート樹脂（旭化成製：デルペット８０）製の
透明板の出射面と反対側の反射面を鏡面とするのみで、
出射面は平面となるように、射出成型により成形したも
のを照明装置の透明板として使用した。さらに、反射面
には微小なドットを白色インク（セイコーアドバンス製
＃２５００）をスクリーン印刷して形成した。このよう
な透明板１を用いて、実施例１と同様な照明装置を作製
した。この照明装置の明るさを評価したところ、1600ｌ
ｘ／ｃｍ2 であった。 Comparative Example 1 A transparent plate made of a methacrylate resin (Delpet 80 manufactured by Asahi Kasei) was used only as a mirror surface on the side opposite to the emission surface.
A transparent plate of the lighting device was formed by injection molding so that the emitting surface was a flat surface. Further, fine dots were formed on the reflecting surface by screen printing a white ink (Seiko Advance # 2500). Using the transparent plate 1 as described above, an illumination device similar to that in Example 1 was manufactured. When the brightness of this lighting device was evaluated, it was 1600l.
It was x / cm 2 .
【００２７】[0027]
【発明の効果】以上の説明から明らかなように、本発明
の照明装置は光源からの光を出射する部分の透明板に凸
条を形成したことにより、光を有効に散乱させることが
でき、照度を大きくかつ均一にでき、薄く、軽量化する
ことができる。As is apparent from the above description, the illuminating device of the present invention can effectively scatter light by forming the ridges on the transparent plate in the part for emitting the light from the light source, The illuminance can be made large and uniform, and it can be made thin and lightweight.
【図１】本発明の照明装置の一実施例の構成を示す平面
図。FIG. 1 is a plan view showing the configuration of an embodiment of a lighting device of the present invention.
【図２】本発明の照明装置の透明板の出射面に設ける凸
条の一形態を示す図。FIG. 2 is a diagram showing one form of a ridge provided on an emission surface of a transparent plate of the lighting device of the present invention.
【図３】本発明の照明装置の透明板の出射面に設ける凸
条の他の形態を示す図。FIG. 3 is a diagram showing another form of the ridges provided on the emission surface of the transparent plate of the lighting device of the present invention.
【図４】本発明の照明装置の透明板の出射面に凸条を互
いに直交した状態で形成した状態を示す図。FIG. 4 is a diagram showing a state in which ridges are formed in a state in which they are orthogonal to each other on the emission surface of the transparent plate of the lighting device of the present invention.
【図５】本発明の照明装置の透明板の出射面に設ける凸
条が透明板の端縁に対して傾斜している状態を示す図。FIG. 5 is a diagram showing a state in which a ridge provided on an emission surface of a transparent plate of the lighting device of the present invention is inclined with respect to an edge of the transparent plate.
【図６】本発明の照明装置の透明板の反射面に設ける細
溝の形態を示す図であって、（ａ）はＶ字溝状の細溝構
造、（ｂ）は凸状細溝構造、（ｃ）は逆Ｕ字溝状の細溝
構造、（ｄ）はエッジ状細溝構造を示す図。6A and 6B are views showing the form of a narrow groove provided on the reflecting surface of the transparent plate of the illuminating device of the present invention, in which FIG. 6A is a V-shaped narrow groove structure, and FIG. 6B is a convex narrow groove structure. , (C) shows an inverted U-shaped groove-shaped narrow groove structure, and (d) shows an edge-shaped narrow groove structure.
【図７】本発明の照明装置の透明板の反射面に設ける細
溝が等間隔の場合に溝深さが徐々に深くなっている状態
を示す図。FIG. 7 is a diagram showing a state in which the groove depth is gradually increased when the fine grooves provided on the reflecting surface of the transparent plate of the illuminating device of the present invention are equidistant.
【図８】本発明の照明装置の透明板の反射面に設ける細
溝の溝深さが一定の場合にピッチが徐々に密になってい
る状態を示す図。FIG. 8 is a view showing a state where the pitch is gradually increased when the groove depth of the fine grooves provided on the reflecting surface of the transparent plate of the lighting device of the present invention is constant.
【図９】本発明の照明装置の透明板の板厚を光源側から
遠ざかるにつれて直線的に薄くした構造を示す図。FIG. 9 is a diagram showing a structure in which the plate thickness of the transparent plate of the illuminating device of the present invention is linearly reduced as it goes away from the light source side.
【図１０】本発明の照明装置の透明板の板厚を光源側か
ら遠ざかるにつれて凸状の曲線的に薄くした構造を示す
図。FIG. 10 is a view showing a structure in which the transparent plate of the illuminating device of the present invention has a convex curve that is thinned away from the light source side.
【図１１】本発明の照明装置の透明板の板厚を光源側か
ら遠ざかるにつれて凹状の曲線的に薄くした構造を示す
図。FIG. 11 is a diagram showing a structure in which the plate thickness of the transparent plate of the illuminating device of the present invention is concavely curvilinearly thinned away from the light source side.
１………透明板 ２………凸条 ３………凹溝 ４………ドット ６………散乱シート ７………光源 Ｓ………透明板の出射面 Ｒ………透明板の反射面 1 ………… Transparent plate 2 ………… Convex stripes 3 ………… Grooves 4 ………… Dots 6 ………… Scattering sheet 7 ………… Light source S ………… Transparent plate exit surface R ………… Transparent plate Reflective surface
───────────────────────────────────────────────────── フロントページの続き (72)発明者 吉田 豊満 埼玉県川口市領家５丁目14番25号 東芝ケ ミカル株式会社川口工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyoma Yoshida 5-14-25 Ryoke, Kawaguchi City, Saitama Prefecture Toshiba Chemical Co., Ltd. Kawaguchi Factory
Claims (14)
を形成した出射面とし、他方の面を多数のドットを形成
した反射面とするとともに前記透明板の一側端または対
向する各側端の近傍に光源を配置して、前記光源から前
記透明板に入射した光が前記出射面から出射するように
構成したことを特徴とする照明装置。1. A transparent plate has one surface serving as a light-emitting surface on which a large number of parallel ridges are formed, and the other surface serving as a reflecting surface on which a large number of dots are formed, and the transparent plate has one side end or opposite. An illuminating device characterized in that a light source is arranged in the vicinity of each side end, and light incident on the transparent plate from the light source is emitted from the emission surface.
形成した凸条とほぼ直交する多数の凹溝を形成したこと
を特徴とする請求項１記載の照明装置。2. The illuminating device according to claim 1, wherein the reflective surface of the transparent plate is provided with a large number of concave grooves substantially orthogonal to the convex stripes formed on the emission surface.
が、平行した多数の凸条を互いに直交させたものからな
ることを特徴とする請求項１または２記載の照明装置。3. The illumination device according to claim 1, wherein the projection formed on the emission surface of the transparent plate is formed by a plurality of parallel projections that are orthogonal to each other.
の開き角度が50°から 150°の範囲で、かつ、そのピッ
チが 1μｍから 1ｍｍの範囲にあることを特徴とする請
求項１乃至３のいずれか１記載の照明装置。4. The opening angle of the ridges formed on the emission surface of the transparent plate is in the range of 50 ° to 150 °, and the pitch thereof is in the range of 1 μm to 1 mm. 3. The lighting device according to any one of 1 to 3.
が、半径10μｍから30μｍの範囲の円弧状をなしてい
て、かつ、そのピッチが 1μｍから 1ｍｍの範囲にある
ことを特徴とする請求項１乃至３のいずれか１記載の照
明装置。5. The ridge formed on the emission surface of the transparent plate has an arc shape with a radius of 10 μm to 30 μm, and the pitch thereof is in the range of 1 μm to 1 mm. The lighting device according to any one of claims 1 to 3.
が光源の配置された側端に対して 0°から20°傾いてい
ることを特徴とする請求項１乃至５のいずれか１記載の
照明装置。6. The ridge formed on the emission surface of the transparent plate is inclined from 0 ° to 20 ° with respect to the side end on which the light source is arranged. Illumination device described.
ｍから 1ｍｍの前記ドットが形成されていることを特徴
とする請求項１乃至６のいずれか１記載の照明装置。7. A radius of 1 μm is provided on the reflecting surface of the transparent plate.
7. The lighting device according to claim 1, wherein the dots of m to 1 mm are formed.
記ドットの半径が、光源側から遠ざかるにつれて大とさ
れていることを特徴とする請求項７記載の照明装置。8. The illumination device according to claim 7, wherein the radius of the dots formed on the reflection surface of the transparent plate is increased as the distance from the light source side increases.
の開き角度が50°から 150°の範囲であり、かつ、その
ピッチが 1μｍから 1ｍｍの範囲にあることを特徴とす
る請求項２記載の照明装置。9. The opening angle of the groove formed in the reflecting surface of the transparent plate is in the range of 50 ° to 150 °, and the pitch thereof is in the range of 1 μm to 1 mm. 2. The lighting device according to 2.
条または前記反射面に形成した多数の凹溝のピッチが10
μｍから 300μｍの範囲にあることを特徴とする請求項
１乃至９のいずれか１記載の照明装置。10. The pitch of a plurality of concave grooves formed on the emitting surface or the reflecting surface of the transparent plate is 10 or less.
The lighting device according to any one of claims 1 to 9, wherein the lighting device is in the range of µm to 300 µm.
数の凹溝において、光源側から遠ざかるほど細溝の溝深
さを徐々に深くしていくことを特徴とする請求項２乃至
１０のいずれか１記載の照明装置。11. The plurality of concave grooves formed on the reflecting surface of the transparent plate, wherein the groove depth of the narrow groove is gradually increased as the distance from the light source side increases. The lighting device according to any one of claims 1.
数の凹溝において、光源側から遠ざかるほど細溝のピッ
チを徐々に密にしていくことを特徴とする請求項２乃至
１０のいずれか１記載の照明装置。12. The plurality of recessed grooves formed on the reflection surface of the transparent plate, wherein the pitch of the narrow grooves is gradually increased as the distance from the light source side increases. The lighting device according to 1.
板の厚みを徐々に薄くしていくことを特徴とする請求項
１乃至１０のいずれか１記載の照明装置。13. The lighting device according to claim 1, wherein the transparent plate is gradually reduced in thickness as the distance from the light source side increases.
ことを特徴とする請求項１乃至１３のいずれか１記載の
照明装置。14. The lighting device according to claim 1, wherein the transparent plate is made of a transparent resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7008847A JPH08203312A (en) | 1995-01-24 | 1995-01-24 | Lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7008847A JPH08203312A (en) | 1995-01-24 | 1995-01-24 | Lighting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08203312A true JPH08203312A (en) | 1996-08-09 |
Family
ID=11704150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7008847A Withdrawn JPH08203312A (en) | 1995-01-24 | 1995-01-24 | Lighting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08203312A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998019105A1 (en) * | 1996-10-25 | 1998-05-07 | Omron Corporation | Surface light source and liquid crystal display, portable telephone and information terminal employing the surface light source |
| JP2000048617A (en) * | 1998-07-28 | 2000-02-18 | Nitto Denko Corp | Light guide plate, surface light source device and reflective liquid crystal display device |
| KR20010046581A (en) * | 1999-11-13 | 2001-06-15 | 김춘호 | Backlight device for display |
| CN100388080C (en) * | 2004-09-30 | 2008-05-14 | 晶元光电股份有限公司 | Light emitting device |
| US7393131B2 (en) | 2003-11-14 | 2008-07-01 | Hon Hai Precision Industry Co., Ltd. | Surface light source having light guide plate with prisms |
| JP2008282825A (en) * | 2004-11-18 | 2008-11-20 | Kofukin Seimitsu Kogyo (Shenzhen) Yugenkoshi | Light guide plate and backlight module |
| JP2009048939A (en) * | 2007-08-22 | 2009-03-05 | Takiron Co Ltd | Surface light-emitting device |
| JP4277049B1 (en) * | 2007-12-14 | 2009-06-10 | 五洋紙工株式会社 | Direct type backlight and liquid crystal television incorporating the backlight |
| JP2011100728A (en) * | 2009-11-06 | 2011-05-19 | Samsung Electronics Co Ltd | Light guide panel, back light unit (blu), and display apparatus |
| JP2012094540A (en) * | 1999-02-23 | 2012-05-17 | Rambus Internatl Ltd | Light emitting panel assembly |
-
1995
- 1995-01-24 JP JP7008847A patent/JPH08203312A/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998019105A1 (en) * | 1996-10-25 | 1998-05-07 | Omron Corporation | Surface light source and liquid crystal display, portable telephone and information terminal employing the surface light source |
| US6167182A (en) * | 1996-10-25 | 2000-12-26 | Omron Corporation | Surface light source device and liquid crystal display device, portable telephone and information terminal employing the surface light source device |
| EP1666935A1 (en) * | 1996-10-25 | 2006-06-07 | Omron Corporation | Surface light source device and liquid crystal display device, portable telephone and information terminal using surface light source device |
| JP2000048617A (en) * | 1998-07-28 | 2000-02-18 | Nitto Denko Corp | Light guide plate, surface light source device and reflective liquid crystal display device |
| JP2012094540A (en) * | 1999-02-23 | 2012-05-17 | Rambus Internatl Ltd | Light emitting panel assembly |
| KR20010046581A (en) * | 1999-11-13 | 2001-06-15 | 김춘호 | Backlight device for display |
| US7393131B2 (en) | 2003-11-14 | 2008-07-01 | Hon Hai Precision Industry Co., Ltd. | Surface light source having light guide plate with prisms |
| CN100388080C (en) * | 2004-09-30 | 2008-05-14 | 晶元光电股份有限公司 | Light emitting device |
| JP2008282825A (en) * | 2004-11-18 | 2008-11-20 | Kofukin Seimitsu Kogyo (Shenzhen) Yugenkoshi | Light guide plate and backlight module |
| JP2009048939A (en) * | 2007-08-22 | 2009-03-05 | Takiron Co Ltd | Surface light-emitting device |
| JP4277049B1 (en) * | 2007-12-14 | 2009-06-10 | 五洋紙工株式会社 | Direct type backlight and liquid crystal television incorporating the backlight |
| JP2011100728A (en) * | 2009-11-06 | 2011-05-19 | Samsung Electronics Co Ltd | Light guide panel, back light unit (blu), and display apparatus |
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