JPH0327909B2 - - Google Patents
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- Publication number
- JPH0327909B2 JPH0327909B2 JP59277625A JP27762584A JPH0327909B2 JP H0327909 B2 JPH0327909 B2 JP H0327909B2 JP 59277625 A JP59277625 A JP 59277625A JP 27762584 A JP27762584 A JP 27762584A JP H0327909 B2 JPH0327909 B2 JP H0327909B2
- Authority
- JP
- Japan
- Prior art keywords
- light source
- light
- prism plate
- fresnel prism
- linear fresnel
- 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.)
- Expired - Lifetime
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- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【発明の詳細な説明】
Ａ 産業上の利用分野
この発明は、カラー液晶表示用等の受動型表示
装置のバツクライトに用いる照明装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a lighting device used as a backlight for a passive display device such as a color liquid crystal display.
Ｂ 発明の概要
この発明は、管状光源と、一辺に鋸歯状断面を
有するリニアフレネルプリズム板と、反射鏡とな
る平面鏡とからなり、上記リニアフレネルプリズ
ムと平面鏡をＶ字型に配置し、該Ｖ字型の開口部
に管状光源を配置した構成とし、平面鏡により生
じる光源の鏡像で光の利用率を高めて明るさを増
し、かつ、光源から離れるに従つて平面鏡とリニ
アフレネルプリズム板とを近接配置することによ
り、反射面の輝度をほぼ均一として明るさのムラ
をなくすようにしたものである。B. Summary of the Invention This invention consists of a tubular light source, a linear Fresnel prism plate having a serrated cross section on one side, and a plane mirror serving as a reflecting mirror.The linear Fresnel prism and plane mirror are arranged in a V-shape, and the The structure has a tubular light source placed in a letter-shaped opening, and the mirror image of the light source generated by the plane mirror increases the light utilization rate and increases brightness, and the plane mirror and linear Fresnel prism plate are brought closer together as the distance from the light source increases. By arranging the reflective surfaces, the brightness of the reflective surface is made almost uniform and unevenness in brightness is eliminated.
Ｃ 従来の技術
液晶表示装置のように自らは発光せずに光の透
過率あるいは反射率を制御することにより自然光
や他の照明源からの照射光を変調しパターン表示
を行う受動型（非発光型）表示装置は、消費電力
が少ないため電卓や腕時計等の携帯用電子機器に
広汎に活用されているが、周囲が暗い場合には照
明手段を設けないと表示が見にくくなる問題があ
つた。特に、大部分の液晶表示装置の表示モード
は液晶の光学的異方性を利用するものであるた
め、偏光板を重ね合わせることが不可欠の要件と
なつており、この偏光板のために照明光の50％程
度はカツトされる。かつ、カラーフイルターを用
いた液晶表示装置では、カラー化のために更に光
量が減少するため、屋内での一般的な使用に際し
ては、表示装置に照明手段を付設することが必須
の要件となる。しかしながら、この内部に付設す
る光源の照明にのみ頼る場合、昼間の屋外のよう
な環境下での使用に際しては、周囲の明るさに負
けないように表示装置の輝度を高くする必要があ
り、その場合、光源の消費電力が大きくなり過ぎ
て液晶表示装置の低消費電力特性が損なわれる結
果となる。従つて、低消費電力特性を生かすた
め、周囲が明るい時には周囲光を取り入れて液晶
表示装置を背面から照らし、周囲が暗い場合には
内部光源により光照射するライトガイドが提案さ
れている。C. Conventional technology Passive type (non-luminescent) devices, such as liquid crystal display devices, which do not emit light themselves but modulate natural light or light emitted from other illumination sources to display patterns by controlling the transmittance or reflectance of light. (type) display devices are widely used in portable electronic devices such as calculators and wristwatches because of their low power consumption, but they have the problem of making the display difficult to see in dark surroundings unless a lighting device is provided. In particular, since the display mode of most liquid crystal display devices utilizes the optical anisotropy of liquid crystal, it is essential to stack polarizing plates, and because of this polarizing plate, the illumination light Approximately 50% of the amount will be cut. In addition, in a liquid crystal display device using a color filter, the amount of light is further reduced due to colorization, so it is essential to attach a lighting means to the display device for general indoor use. However, when relying only on the illumination of the light source attached to the interior, when used in an environment such as outdoors in the daytime, it is necessary to increase the brightness of the display device so as not to lose the brightness of the surroundings. In this case, the power consumption of the light source becomes too large and the low power consumption characteristics of the liquid crystal display device are impaired. Therefore, in order to take advantage of the low power consumption characteristics, a light guide has been proposed that takes in ambient light to illuminate the liquid crystal display device from the back when the surroundings are bright, and illuminates the liquid crystal display device from an internal light source when the surroundings are dark.
従来、この種の内部照明手段として用いるバツ
クライトは、第４図に示すように、光源１として
白熱豆電球や蛍光灯を用い、該光源１と表示パネ
ル２との間に照明面の輝度を面全体にわたつて均
一にさせる光散乱効果を有する乳白色のガラスあ
るいは合成樹脂板からなる拡散透過板３を設置
し、かつ、光源１の背面側に、光源からの光を反
射させて前面に導くことにより光の利用率を向上
させる鏡面反射板もしくは光散乱アクリル板から
なる反射板４を設置した構成としている。このよ
うなバツクライトにおいては、明るさのムラを少
なくするために、光源１と拡散透過板３との距離
を余り小さく出来ないため、奥行きが大きくなる
という欠点があつた。 Conventionally, a backlight used as this type of internal lighting means uses an incandescent miniature light bulb or a fluorescent lamp as the light source 1, and the luminance of the illumination surface is adjusted between the light source 1 and the display panel 2, as shown in FIG. A diffuse transmission plate 3 made of milky white glass or a synthetic resin plate having a uniform light scattering effect over the entire area is installed, and the light from the light source is reflected on the back side of the light source 1 and guided to the front side. The configuration is such that a reflecting plate 4 made of a specular reflecting plate or a light-scattering acrylic plate is installed to improve the light utilization efficiency. In such a backlight, the distance between the light source 1 and the diffuser-transmitting plate 3 cannot be made very small in order to reduce unevenness in brightness, so the backlight has a drawback that the depth becomes large.
また、従来、第５図に示すごとく、光源１と表
示パネル２との間にエツジライト５を設置し、光
源１よりエツジライト５のＡ面を介して入射した
光が粗面加工したＢ面で拡散反射された後に、Ｃ
面を介してＣ面に近接配置した表示パネル２に照
射するようにしたものも提案されている。しかし
ながら、この方式では粗面加工したＢ面の輝度は
光源から遠くなるに従つて暗くなり、照明面の輝
度を均一にできず、照明にムラが生じる欠点があ
る。 Conventionally, as shown in FIG. 5, an edge light 5 is installed between the light source 1 and the display panel 2, and the light incident from the light source 1 through the A side of the edge light 5 is diffused by the roughened B side. After being reflected, C
It has also been proposed that the display panel 2 placed close to the C-plane is irradiated with the light through the C-plane. However, in this method, the brightness of the roughened surface B becomes darker as the distance from the light source increases, and the brightness of the illuminated surface cannot be made uniform, resulting in uneven illumination.
Ｄ 発明が解決しようとする問題点
この発明は、上記した従来の照明ムラおよび奥
行きの問題を解消し、薄型で、均一な輝度を有し
照明ムラの生じない明るい表示を得ることが出来
る照明装置を提供せんとするものである。D. Problems to be Solved by the Invention The present invention solves the above-described conventional illumination unevenness and depth problems, and provides a thin lighting device that has uniform brightness and can provide a bright display without uneven illumination. We aim to provide the following.
Ｅ 問題点を解決すための手段
この発明は上記した問題点を解決するためにな
されたものであり、管状光源と、リニアフレネル
プリズム板と、反射鏡とを備え、
上記リニアフレネルプリズム板と反射鏡とを鋭
角をなすように一端を互いに近接させると共に他
端を互いに離反させてＶ字型に配置し、該Ｖ字型
の開口位置に管状光源を設置し、かつ、
上記リニアフレネルプリズム板は一辺が直線状
で他辺が鋸歯状の断面を有する複数個のプリズム
集合体であり、上記管状光源側に面する鋸歯の一
側斜面を入射面、他側斜面を反射面とすると共
に、上記他辺の直線面を出射面とし、上記反射面
の角度は上記入射面から入射した光が出射面から
ほぼ垂直な光として出ていくように設定している
構成としたことを特徴とするものである。E Means for Solving the Problems This invention has been made to solve the above-mentioned problems, and includes a tubular light source, a linear Fresnel prism plate, and a reflecting mirror. The linear Fresnel prism plate is arranged in a V-shape with one end close to each other and the other end separated from each other so as to form an acute angle, and a tubular light source is installed at the opening position of the V-shape, and the linear Fresnel prism plate is It is an assembly of a plurality of prisms each having a linear cross section on one side and a sawtooth cross section on the other side, with one side slope of the sawtooth facing the tubular light source serving as an incident surface and the other side slope serving as a reflection surface. The linear surface on the other side is the output surface, and the angle of the reflective surface is set so that the light incident from the input surface exits as almost perpendicular light from the output surface. It is.
Ｆ 作用
この発明は上記した構成とし、リニアフレネル
プリズム板と反射鏡となる平面鏡とを組み合わ
せ、平面鏡により管状光源の鏡像が生じることに
より、ほぼ２倍の管径の光源を用いた場合と同様
として光の利用率が高められる。しかも、リニア
フレネルプリズム板の鋸歯の傾斜角度を所定角度
に設定して、リニアフレネルプリズム板の出射面
からほぼ垂直な光として出ていくように設定して
いるため、照明装置の奥行きを大きくすることな
く、薄型と出来る。即ち、従来のように、出射光
が拡散光の場合は、明るさのムラを少なくするた
めに光源と拡散透過板との距離を大きくして奥行
きを大きくする必要があるが、本発明では上記し
たように出射光が拡散光でなく互いに平行で出射
面に対してほぼ垂直な光りであるため、表示面の
明るさのムラをなくすために奥行きを大きくする
必要がない。かつ、リニアフレネルプリズム板と
平面鏡とを光源から遠くなるに従つて近接するよ
うにＶ字型に配置すると共に、該Ｖ字型の開口位
置に光源を配置した構成しとしていることによ
り、光源側と光源より離れた側の反射面の輝度は
ほぼ均一に平均化され、表示面における明るさの
ムラをなくすことが出来る。F Effect This invention has the above-mentioned configuration, and combines a linear Fresnel prism plate and a plane mirror serving as a reflecting mirror, and the plane mirror produces a mirror image of the tubular light source, which is similar to the case where a light source with approximately twice the diameter of the tube is used. The utilization rate of light is increased. Moreover, the inclination angle of the sawtooth of the linear Fresnel prism plate is set to a predetermined angle so that the light exits from the output surface of the linear Fresnel prism plate almost perpendicularly, so the depth of the illumination device can be increased. It can be made thin without any problems. That is, as in the conventional case, when the emitted light is diffused light, it is necessary to increase the depth by increasing the distance between the light source and the diffuse transmission plate in order to reduce unevenness in brightness, but in the present invention, the above-mentioned As described above, the emitted light is not diffused light but is parallel to each other and substantially perpendicular to the output surface, so there is no need to increase the depth in order to eliminate uneven brightness on the display surface. Moreover, by arranging the linear Fresnel prism plate and the plane mirror in a V-shape so that they approach each other as they get farther from the light source, and by arranging the light source at the opening position of the V-shape, the light source side The brightness of the reflective surface on the side away from the light source is almost uniformly averaged, and unevenness in brightness on the display surface can be eliminated.
Ｇ 実施例
以下、この発明を図面に示す実施例により詳細
に説明する。G. Embodiments Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.
〈照明装置の全体の構成〉……第１図
この発明の照明装置を示す第１図において、１
０は管状光源、１１はリニアフレネルプリズム
板、１２は平面鏡となる平面鏡であり、図示の如
く、リニアフレネルプリズム板１１と平面鏡１２
とをそれぞれの一端を接すると共に、他端を離反
させて、θ＝30℃以下の鋭角をなすＶ字型に配置
し、離反させた開口位置に近接して管状光源１０
を配置している。１３はリニアフレネルプリズム
板１１の前方に配置したカラー液晶表示パネルで
ある。<Overall configuration of lighting device>...Fig. 1 In Fig. 1 showing the lighting device of the present invention, 1
0 is a tubular light source, 11 is a linear Fresnel prism plate, and 12 is a plane mirror that serves as a plane mirror.As shown in the figure, the linear Fresnel prism plate 11 and the plane mirror 12 are
The tubular light source 10 is arranged in a V-shape forming an acute angle of θ=30°C or less, with one end in contact with the other end and the other end separated.
are placed. 13 is a color liquid crystal display panel placed in front of the linear Fresnel prism plate 11.
〈管状光源の説明〉……第１図
上記管状光源１０としては、冷陰極蛍光放電
管、熱陰極蛍光放電管（蛍光灯）、ネオン管等の
放電管あるいは直線状フイラメントを有する白熱
電球等が用いられ、特に、発光効率および発光色
の点で熱陰極蛍光放電管が好適に用いられる。<Description of a tubular light source>...Figure 1 The tubular light source 10 may be a discharge tube such as a cold cathode fluorescent discharge tube, a hot cathode fluorescent discharge tube (fluorescent lamp), a neon tube, or an incandescent light bulb having a linear filament. In particular, a hot cathode fluorescent discharge tube is preferably used in terms of luminous efficiency and luminous color.
〈リニアフルネルプリズム板の説明〉・第２図
上記リニアフレネルプリズム板１１は、一辺が
直線状で他辺が鋸歯状の断面を有する平板状のプ
リズムであり、管状光源１０側に面する鋸歯の１
斜面を入射面１１Ａ、鋸歯の他斜面を反射面１１
Ｂとし、他側の直線面を出射面１１Ｃとしてい
る。上記入射面１１Ａと反射面１１Ｂは、照明面
の大きさに比べて十分細かい周期で繰り返してい
る。上記入射面１１Ａの角度は、管状光源１０か
らの光L1をほぼ垂直に受けるように設定し、ま
た、反射面１１Ｂの角度は入射面１１Ａから入射
した光L2が出射面１１Ｃからほぼ垂直な光L3と
して出ていくように設定している。即ち、管状光
源１０からの光の入射角α1を垂線Ｓに対して70゜
とすると、入射面１１Ａと垂線Ｓのなす角度α2を
20゜、反射面１１Ｂと垂線Ｓのなす角度α3を35゜と
している。該リニアフレネルプリズム板１１とし
てアクリル樹脂（屈折率ｎ＝1.491）を用いると、
臨界角は約42゜となるので、反射面１１Ｂでの反
射を全反射とすることができる。<Description of the linear Fresnel prism plate> Fig. 2 The linear Fresnel prism plate 11 is a flat prism with one side straight and the other side having a sawtooth cross section, and the sawtooth facing the tubular light source 10 side. 1
The slope is the incident surface 11A, and the sawtooth slope is the reflection surface 11.
B, and the linear surface on the other side is the output surface 11C. The incident surface 11A and the reflective surface 11B are repeated at a sufficiently finer period than the size of the illumination surface. The angle of the incident surface 11A is set so that the light L 1 from the tubular light source 10 is received almost vertically, and the angle of the reflective surface 11B is set so that the light L 2 incident from the incident surface 11A is almost vertically received from the output surface 11C. It is set so that the light comes out as L 3 . That is, if the incident angle α 1 of the light from the tubular light source 10 is 70° with respect to the perpendicular S, then the angle α 2 between the incident surface 11A and the perpendicular S is
20°, and the angle α 3 between the reflective surface 11B and the perpendicular S is 35°. When acrylic resin (refractive index n=1.491) is used as the linear Fresnel prism plate 11,
Since the critical angle is about 42 degrees, the reflection at the reflecting surface 11B can be total reflection.
尚、上記照明装置によつて照明される表示パネ
ル１３が本実施例の如き液晶表示のように視覚依
存性のある場合は、出射光α3の方向を表示素子の
最適視覚方向に合わせることも可能である。 Incidentally, if the display panel 13 illuminated by the above-mentioned illumination device is visually dependent like a liquid crystal display as in this embodiment, the direction of the emitted light α 3 may be adjusted to the optimum visual direction of the display element. It is possible.
〈照明装置の作用〉……第３図
次に、上記照明装置の作用を第３図により説明
する。第３図（）は本発明の平面鏡１２を用い
た場合を示し、（）は前記従来の第５図に示す
平面鏡を用いない場合を示すものである。<Function of the illumination device>...Fig. 3 Next, the function of the above-mentioned illumination device will be explained with reference to Fig. 3. FIG. 3() shows a case where the plane mirror 12 of the present invention is used, and FIG. 3() shows a case where the conventional plane mirror shown in FIG. 5 is not used.
管状光源１０の直径をＤ、リニアフレネルプリ
ズム板１１の幅をＷとすると、（）の平面鏡を
用いない場合は、入射面１１Ａの角度をarccos
（Ｗ／Ｄ）となるように設定すると、管状光源１
０の反射面１１Ｂによる鏡像１０″はスダレ状に
Ｗ／Ｄ倍に引き伸ばされて見えるので、平均輝度
は管状光源１０の表面輝度のＤ／Ｗ倍になる。一
方、（）に示す本発明の平面鏡１２を用いた場
合、平面鏡１２により管状光源１０の鏡像１０′
が生じるので、入射面１１Ａの角度をarccos
（Ｗ／2D）となるように設定すると、２倍の管径
の光源を用いたのと同じこととなる。よつて、管
状光源の鏡像１０′はＷ／2D倍に引き伸ばされ、
平均輝度は管状光源１０の2D／Ｗ倍となる。こ
のように、本発明の如く平面鏡１２を用いると、
奥行きが同じままで、利用出来る光束が２倍とな
り、明るさが２倍に向上する。 Assuming that the diameter of the tubular light source 10 is D and the width of the linear Fresnel prism plate 11 is W, the angle of the incident surface 11A is arccos when the plane mirror shown in parentheses is not used.
(W/D), tubular light source 1
Since the mirror image 10'' by the reflective surface 11B of 0 appears to be stretched by W/D times in a sagging pattern, the average brightness is D/W times the surface brightness of the tubular light source 10.On the other hand, the present invention shown in () When a plane mirror 12 is used, the plane mirror 12 creates a mirror image 10' of the tubular light source 10.
occurs, so the angle of the incident surface 11A is arccos
(W/2D) is the same as using a light source with twice the tube diameter. Therefore, the mirror image 10' of the tubular light source is stretched by a factor of W/2D,
The average brightness is 2D/W times that of the tubular light source 10. In this way, when the plane mirror 12 is used as in the present invention,
While the depth remains the same, the usable luminous flux is doubled and the brightness is doubled.
上記したように、本発明によれば、浅い奥行き
で広い画面を照明することが出来るので、リニア
フルネルプリズム板１１と平面鏡１２とのなす角
度θを30゜以下の小さい角度とすることもでき、
照明装置をより薄型とすることが可能となる。 As described above, according to the present invention, since a wide screen can be illuminated with a shallow depth, the angle θ between the linear Fournel prism plate 11 and the plane mirror 12 can be made as small as 30° or less. ,
It becomes possible to make the lighting device thinner.
また、管状光源１０として蛍光放電管を用いる
と、蛍光体層の配光分布は完全拡散面に近いの
で、管表面の輝度は管表面の視線のなす角度に殆
ど依存せず、ほぼ一様な輝度を有する帯状光源と
同じに見なされる。従つて、第３図に示した状態
では、ほぼ一様な輝度の縞が観察され、表示パネ
ル１３の全体をほぼ均一な輝度で照射し、明るさ
のムラを少なくすることが出来る。尚、管状光源
１０から出る光のうち、リニアフルネルプリズム
板１１や平面鏡１２に向かわない光は照明に寄与
しないので、光源の内壁や外壁の一部に反射層を
設けるか、あるいは光源の外壁に近接して樋状の
反射鏡を設け、必要な方向の光の強度を増すこと
が出来、該方法を用いると、輝度は30〜70％向上
する。 Furthermore, when a fluorescent discharge tube is used as the tubular light source 10, the light distribution of the phosphor layer is close to a completely diffused surface, so the luminance of the tube surface hardly depends on the angle formed by the line of sight on the tube surface and is almost uniform. It is considered the same as a band-shaped light source with brightness. Therefore, in the state shown in FIG. 3, stripes with substantially uniform brightness are observed, and the entire display panel 13 can be illuminated with substantially uniform brightness, thereby reducing unevenness in brightness. Note that among the light emitted from the tubular light source 10, the light that does not go toward the linear Fournel prism plate 11 or the plane mirror 12 does not contribute to illumination. A trough-like reflector can be placed in close proximity to increase the intensity of light in the required direction, and using this method, the brightness can be improved by 30-70%.
Ｈ 発明の効果
以上の説明より明らかなように、この発明に係
る照明装置によれば、リニアフルネルプリズム板
と反射鏡となる平面鏡をＶ字型に配置し、該Ｖ字
型の開口部に管状光源を配置した構成とすること
により、光源からの光の利用率を高める事がで
き、上記平面鏡を配置しない場合の奥行きと同じ
ままで利用できる光束がほぼ２倍となり、明るさ
をほぼ２倍に向上させることが出来る。しかも、
出射光はリニアフレネルプリズム板の出射面に対
してほぼ垂直方向となり、拡散光でないため、光
のムラを減少するために奥行きを深くとる必要が
なく、よつて、照明装置を薄型で、明るくするこ
とが出来ると共に、リニアフレネルプリズム板と
平面鏡とを光源より離れるに従つて互いに近接す
る配置としたことにより、輝度もほぼ一様とすこ
とが出来、照明ムラを減少できる等の種々の効果
を有するものである。H. Effects of the Invention As is clear from the above description, according to the lighting device according to the present invention, a linear Fournel prism plate and a plane mirror serving as a reflecting mirror are arranged in a V-shape, and the V-shaped opening is By arranging a tubular light source, it is possible to increase the utilization rate of light from the light source, and the luminous flux that can be used remains the same as when the plane mirror is not arranged, and the luminous flux that can be used is almost doubled, and the brightness is almost doubled. It can be doubled. Moreover,
Since the emitted light is almost perpendicular to the output surface of the linear Fresnel prism plate and is not diffused light, there is no need to increase the depth to reduce unevenness of light, thus making the lighting device thinner and brighter. In addition, by arranging the linear Fresnel prism plate and the plane mirror closer to each other as they move away from the light source, the brightness can be made almost uniform, and various effects such as reducing uneven illumination can be achieved. It is something that you have.
第１図はこの発明の実施例を示す側面図、第２
図はこの発明に用いるリニアフレネルプリズム板
の断面図、第３図（）はこの発明装置の作用を
示す図面、第３図（）は従来装置の作用を示す
図面、第４図および第５図は従来例を示す概略図
である。
１０……管状光源、１１……リニアフレネルプ
リズム板、１２……平面鏡、１３……表示パネ
ル。
Fig. 1 is a side view showing an embodiment of the invention, Fig. 2 is a side view showing an embodiment of the present invention;
The figure is a cross-sectional view of a linear Fresnel prism plate used in the present invention, Figure 3 () is a diagram showing the operation of the device of this invention, Figure 3 () is a diagram showing the operation of the conventional device, and Figures 4 and 5. 1 is a schematic diagram showing a conventional example. 10... Tubular light source, 11... Linear Fresnel prism plate, 12... Plane mirror, 13... Display panel.
Claims (1)
反射鏡とを備え、 上記リニアフレネルプリズム板と反射鏡とを鋭
角をなすように一端を互いに近接させるとともに
他端を離反させてＶ字型に配置し、該Ｖ字型の開
口位置に管状光源を設置し、かつ、 上記リニアフレネルプリズム板は一辺が直線状
で他辺が鋸歯状の断面を有する複数個のプリズム
集合体であり、上記管状光源側に面する鋸歯の一
側斜面を入射面、他側斜面を反射面とすると共
に、上記他辺の直線面を出射面とし、上記反射面
の角度は上記入射面から入射した光が出射面から
ほぼ垂直な光として出ていくように設定している
ことを特徴とする照明装置。[Claims] 1. A tubular light source, a linear Fresnel prism plate,
a reflecting mirror, the linear Fresnel prism plate and the reflecting mirror are arranged in a V-shape with one end close to each other so as to form an acute angle and the other end separated, and a tubular light source is provided at the opening position of the V-shape. and the linear Fresnel prism plate is an assembly of a plurality of prisms each having a linear cross section on one side and a sawtooth cross section on the other side, and one side slope of the sawtooth facing the tubular light source side is an incident surface. , the other side slope is used as a reflective surface, and the straight line surface on the other side is used as an output surface, and the angle of the reflective surface is set so that the light incident from the above input surface exits as almost perpendicular light from the output surface. A lighting device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59277625A JPS61158367A (en) | 1984-12-29 | 1984-12-29 | Lighting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59277625A JPS61158367A (en) | 1984-12-29 | 1984-12-29 | Lighting apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61158367A JPS61158367A (en) | 1986-07-18 |
| JPH0327909B2 true JPH0327909B2 (en) | 1991-04-17 |
Family
ID=17586029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59277625A Granted JPS61158367A (en) | 1984-12-29 | 1984-12-29 | Lighting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61158367A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0778561B2 (en) * | 1987-06-24 | 1995-08-23 | 信越ポリマ−株式会社 | Backlight device |
| JPH01126627A (en) * | 1987-11-11 | 1989-05-18 | Hitachi Ltd | Liquid crystal display device |
| JPH03144486A (en) * | 1989-10-31 | 1991-06-19 | Enplas Corp | Plane light source device |
| JP2803899B2 (en) * | 1990-08-23 | 1998-09-24 | 三菱電機株式会社 | Liquid crystal display |
| US5150966A (en) * | 1990-09-19 | 1992-09-29 | Minnesota Mining And Manufacturing Company | Uniform intensity profile catadioptric lens |
| JP2723481B2 (en) * | 1995-04-07 | 1998-03-09 | 株式会社光エネルギ応用研究所 | Flat lighting device |
| US6224223B1 (en) | 1997-12-22 | 2001-05-01 | Casio Computer Co., Ltd. | Illumination panel and display device using the same |
| US6447135B1 (en) | 1999-10-08 | 2002-09-10 | 3M Innovative Properties Company | Lightguide having a directly secured reflector and method of making the same |
| US6845212B2 (en) | 1999-10-08 | 2005-01-18 | 3M Innovative Properties Company | Optical element having programmed optical structures |
| US6356391B1 (en) | 1999-10-08 | 2002-03-12 | 3M Innovative Properties Company | Optical film with variable angle prisms |
| US7046905B1 (en) | 1999-10-08 | 2006-05-16 | 3M Innovative Properties Company | Blacklight with structured surfaces |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51130190A (en) * | 1975-05-06 | 1976-11-12 | Hitachi Ltd | Liquid crystal display |
-
1984
- 1984-12-29 JP JP59277625A patent/JPS61158367A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61158367A (en) | 1986-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |