JPH1039808A - Illumination device - Google Patents
Illumination deviceInfo
- Publication number
- JPH1039808A JPH1039808A JP8191948A JP19194896A JPH1039808A JP H1039808 A JPH1039808 A JP H1039808A JP 8191948 A JP8191948 A JP 8191948A JP 19194896 A JP19194896 A JP 19194896A JP H1039808 A JPH1039808 A JP H1039808A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- casing
- bottom wall
- reflection
- type casing
- 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- Withdrawn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
- 238000005286 illumination Methods 0.000 title claims abstract description 12
- 238000009792 diffusion process Methods 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 22
- 229910052709 silver Inorganic materials 0.000 claims description 8
- 239000004332 silver Substances 0.000 claims description 8
- 229940100890 silver compound Drugs 0.000 claims description 3
- 150000003379 silver compounds Chemical class 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 14
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 229920005668 polycarbonate resin Polymers 0.000 description 5
- 239000004431 polycarbonate resin Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229920003006 Polybutadiene acrylonitrile Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はワードプロセッサ
ー，パーソナルコンピューター，液晶テレビなど液晶表
示装置用の直下式バックライトに適する平面型の照明装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat illuminating device suitable for a direct backlight for a liquid crystal display device such as a word processor, a personal computer, and a liquid crystal television.
【０００２】[0002]
【従来の技術】たとえば、ワードプロセッサー，パーソ
ナルコンピューター，液晶テレビなど液晶表示装置のバ
ックライト用照明装置は、冷陰極低圧放電ランプ（冷陰
極蛍光ランプ）を光源とし、液晶表示パネルの背面か
ら、平面的にほぼ均一な光を当てて、液晶面を表示する
ため多用されている。2. Description of the Related Art For example, a backlight illumination device for a liquid crystal display device such as a word processor, a personal computer, and a liquid crystal television uses a cold-cathode low-pressure discharge lamp (cold-cathode fluorescent lamp) as a light source. It is often used to display a liquid crystal surface by irradiating substantially uniform light to the surface.
【０００３】図５は、従来のバックライト用照明装置の
基本的構成を展開して斜視的に示したものである。図５
において、１は前面が開口可能に形成された浅い皿形状
を成す反射形ケーシング、２は前記反射形ケーシング１
内に配置された平面的に配置され、かつ電気的に接続さ
れた冷陰極低圧放電ランプである。ここで、反射形ケー
シング１は、たとえばポリカーボネート樹脂，もしくは
ポリカーボネート樹脂混合系の耐候性樹脂などで構成さ
れている。FIG. 5 is an exploded perspective view showing the basic structure of a conventional backlight illumination device. FIG.
In the drawings, 1 is a reflection type casing having a shallow dish shape with a front surface formed to be openable, and 2 is the reflection type casing 1
A cold-cathode low-pressure discharge lamp arranged in a plane and electrically connected thereto. Here, the reflective casing 1 is made of, for example, a polycarbonate resin or a polycarbonate resin-mixed weather-resistant resin.
【０００４】また、冷陰極低圧放電ランプ２は、たとえ
ば複数本のＵ字形冷陰極蛍光ランプを接続用端子部３で
直列に接続し、両端を給電端子として形成されている。
さらに、４は冷陰極低圧放電ランプ２の給電端子側に装
着・配置されたゴムなどの弾性体から成るランプホルダ
ー、５は前記反射形ケーシング１の開口部に着脱自在に
装着される合成樹脂系の拡散透過板である。The cold cathode low-pressure discharge lamp 2 is formed, for example, by connecting a plurality of U-shaped cold cathode fluorescent lamps in series at a connection terminal portion 3 and using both ends as power supply terminals.
Further, reference numeral 4 denotes a lamp holder made of an elastic material such as rubber, which is mounted and arranged on the power supply terminal side of the cold cathode low-pressure discharge lamp 2, and 5 is a synthetic resin system which is removably mounted in the opening of the reflective casing 1. Is a diffusion transmission plate.
【０００５】なお、反射形ケーシング１の底壁面1aは、
一定の方向に凹凸面化（ストライブ状な突起1bが形設）
しており、この凹凸面が反射面として機能する一方、冷
陰極低圧放電ランプ２を、その屈曲部2aなど係止片1cで
係止して反射形ケーシング１内に平面的に配置・装着す
る。また、冷陰極低圧放電ランプ２は、反射形ケーシン
グ１の側壁部1dに一体的に設置されている一対の支持機
構６によって、ランプホルダー４が挟着的に支持され、
反射型ケーシング１内に固定・装着されている。 前記
構成において、ランプホルダー４を介して支持機構（支
持溝）６に冷陰極低圧放電ランプ２の両端部を嵌着支持
させるのは、点灯時に生じる熱膨脹に伴う微小なバルブ
の変形、および使用時の衝撃や振動による外力などをゴ
ム系弾性材のホルダー３で吸収させ、冷陰極低圧放電ラ
ンプ２の破損を防止する一方、電気的絶縁も付与させて
いる。The bottom wall 1a of the reflective casing 1 is
Uneven surface in a certain direction (stripe-like projections 1b are formed)
The concave and convex surface functions as a reflective surface, and the cold cathode low-pressure discharge lamp 2 is locked by a locking piece 1c such as a bent portion 2a and arranged and mounted in the reflective casing 1 in a planar manner. . The cold-cathode low-pressure discharge lamp 2 has a lamp holder 4 sandwiched and supported by a pair of support mechanisms 6 integrally provided on the side wall 1d of the reflective casing 1,
It is fixed and mounted in the reflective casing 1. In the above configuration, both ends of the cold-cathode low-pressure discharge lamp 2 are fitted to and supported by the support mechanism (support groove) 6 via the lamp holder 4 because the minute bulb is deformed due to the thermal expansion that occurs at the time of lighting and during use. The external force due to the impact or vibration of the lamp is absorbed by the rubber-based elastic material holder 3 to prevent the cold cathode low-pressure discharge lamp 2 from being damaged and to provide electrical insulation.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら上記構成
の照明装置の場合は、次のような不都合な問題がある。
すなわち、上記平面形光源をいわゆる直下式のバックラ
イトとして使用した場合、図６ (a)に示すような配光特
性を呈する。つまり、図６ (b)に模式的に示すように、
前記構成の平面形照明装置の照明光は、冷陰極低圧放電
ランプ２から出射して直接拡散透過板５に向かう光と、
反射形ケーシング１の底壁面1a（ストライブ状の凸面1
b）における反射光とが拡散透過板５を通過して液晶面
を照射する。したがって、冷陰極低圧放電ランプ２の発
光部直上（真上）は、輝度が高く、冷陰極低圧放電ラン
プ２の発光部間の輝度が低いという配光特性を呈するこ
とになる。 そして、前記のような配光特性、換言する
と、平面的に高輝度領域および低輝度領域のストライブ
状な配光ムラを呈することは、液晶表示面を不均一に光
照射することを意味し、高品質な液晶表示を得るうえで
問題がある。However, in the case of the lighting device having the above structure, there are the following disadvantageous problems.
That is, when the above-mentioned flat light source is used as a so-called direct-type backlight, it exhibits light distribution characteristics as shown in FIG. That is, as schematically shown in FIG.
Illumination light of the flat illumination device having the above-described configuration is emitted from the cold cathode low-pressure discharge lamp 2 and directly directed to the diffuse transmission plate 5;
Bottom wall 1a of reflective casing 1 (stripe-shaped convex surface 1
The reflected light in b) passes through the diffuse transmission plate 5 and irradiates the liquid crystal surface. Therefore, immediately above (directly above) the light emitting portion of the cold cathode low pressure discharge lamp 2 has a light distribution characteristic in which the luminance is high and the brightness between the light emitting portions of the cold cathode low pressure discharge lamp 2 is low. The light distribution characteristics as described above, in other words, exhibiting the stripe-like light distribution unevenness of the high luminance region and the low luminance region in a plane means that the liquid crystal display surface is non-uniformly irradiated with light. There is a problem in obtaining a high quality liquid crystal display.
【０００７】上記輝度ムラ対策として、図７ (a)に要部
の概略構成を断面的に示すように、反射形ケーシング１
の凸面1b化した底壁面1aに、反射層としてアルミニウム
層７を形設することが試みられている。つまり、反射形
ケーシング１底壁面1aでの光反射をより効率的化するこ
とによって、輝度ムラ発生の抑制もしくは拡散透過板５
面における輝度ムラの低減が試みられている。しかし、
このような構成とした場合でも、配光特性は、図７ (b)
に示すごとくで、依然として輝度ムラの問題は解消され
ていない。As a countermeasure for the above-mentioned luminance unevenness, as shown in FIG.
Attempts have been made to form an aluminum layer 7 as a reflective layer on the bottom wall surface 1a that has been made into a convex surface 1b. In other words, by making the light reflection on the bottom wall surface 1a of the reflective casing 1 more efficient, it is possible to suppress the occurrence of uneven brightness or to make the diffuse transmission
Attempts have been made to reduce uneven brightness on the surface. But,
Even with such a configuration, the light distribution characteristics are as shown in FIG.
As described above, the problem of uneven brightness has not been solved yet.
【０００８】また、反射形ケーシング１の底壁平坦面を
鏡面反射層化し、凸面1b化した面を白色化する一方、放
電ランプ２の発光部直上（真上）に発光ムラ防止膜を配
置する構成も知られている（特開平4-323687号公報）。
しかし、この場合は構成が複雑化し、量産性などが劣る
だけでなく、輝度ムラ対策として十分とはいえない。本
発明は上記事情に対処してなされたもので、液晶表示装
置の直下式バックライトとしての使用において、ほぼ一
様な高輝度の照射が可能な照明装置の提供を目的とす
る。The flat surface of the bottom wall of the reflective casing 1 is made into a mirror-reflective layer, and the surface made into the convex surface 1b is made white, and a light emission unevenness preventing film is disposed just above (directly above) the light emitting portion of the discharge lamp 2. The configuration is also known (JP-A-4-323687).
However, in this case, the configuration becomes complicated, the mass productivity is inferior, etc., and it cannot be said that it is sufficient as a measure against luminance unevenness. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a lighting device capable of emitting substantially uniform high-luminance light when used as a direct backlight of a liquid crystal display device.
【０００９】[0009]
【課題を解決するための手段】請求項１の発明は、前面
が開口可能に形成され、かつ内底壁面が一定の方向に凹
凸の反射面化した反射形ケーシングと、前記反射形ケー
シング内底壁面の凹部に配置され、平面状の発光部を形
成する冷陰極低圧放電ランプと、前記反射形ケーシング
の凸部面に形設・配置された鏡面反射膜と、前記反射形
ケーシングの開口部に着脱自在に装着される拡散透過板
とを有する照明装置であって、前記凸部面に形設・配置
された鏡面反射膜がほぼ45°の角度で傾斜していること
を特徴とする照明装置である。According to a first aspect of the present invention, there is provided a reflection type casing having a front surface formed to be openable, and an inner bottom wall surface having a reflection surface with irregularities in a predetermined direction, and an inner bottom surface of the reflection type casing. A cold-cathode low-pressure discharge lamp, which is arranged in a concave portion of a wall surface and forms a planar light emitting portion, a mirror-like reflective film formed and arranged on a convex surface of the reflective casing, and an opening of the reflective casing. An illumination device having a diffuse transmission plate which is detachably mounted, wherein the specular reflection film formed and arranged on the convex surface is inclined at an angle of approximately 45 °. It is.
【００１０】請求項２の発明は、前面が開口可能に形成
され、かつ内底壁面が一定の方向に凹凸の反射面化した
反射形ケーシングと、前記反射形ケーシング内底壁面の
凹部に配置され、平面状の発光部を形成する冷陰極低圧
放電ランプと、前記反射形ケーシングの凸部面に形設・
配置された鏡面反射膜と、前記反射形ケーシングの開口
部に着脱自在に装着される拡散透過板とを有する照明装
置であって、前記凸部面がほぼ45°の傾斜面を成し、か
つこの傾斜面に鏡面反射膜が被覆・形設されていること
を特徴とする照明装置である。According to a second aspect of the present invention, there is provided a reflective casing in which a front surface is formed to be openable and an inner bottom wall surface is formed as a reflecting surface having irregularities in a predetermined direction, and is disposed in a concave portion of the inner wall surface of the reflective casing. A cold-cathode low-pressure discharge lamp forming a planar light-emitting part, and a projection formed on the reflective casing.
An illuminating device having a mirror-reflective film disposed thereon and a diffuse transmission plate detachably attached to an opening of the reflective casing, wherein the convex surface forms an approximately 45 ° inclined surface, and A lighting device characterized in that a specular reflection film is coated and formed on the inclined surface.
【００１１】請求項３の発明は、請求項１もしくは請求
項２記載の照明装置において、鏡面反射膜が銀もしくは
銀の化合物で形成されていることを特徴とする。According to a third aspect of the present invention, in the lighting device according to the first or second aspect, the specular reflection film is formed of silver or a silver compound.
【００１２】請求項４の発明は、請求項１ないし請求項
３いずれか一記載の照明装置において、冷陰極低圧放電
ランプがＵ字形の屈曲部で平面状化されていることを特
徴とする。According to a fourth aspect of the present invention, in the lighting device according to any one of the first to third aspects, the cold-cathode low-pressure discharge lamp is flattened at a U-shaped bent portion.
【００１３】つまり、本発明は、反射形ケーシングの内
底壁面を一定方向の凹凸面として、凹面領域に冷陰極低
圧放電ランプを装着配置する一方、この冷陰極低圧放電
ランプ側面側の凸面をほぼ45°の傾斜角度の反射面に設
定し、かつ反射面を鏡面反射層としたことを骨子とす
る。そして、このような構成配置をとったことにより、
冷陰極低圧放電ランプが発生する可視光の輝度ムラを解
消・低減するだけでなく、反射効率および光量を上昇さ
せ、高品質，高機能な照明装置化したものである。 上
記本発明は、次のような経緯に基づいてなされたもので
ある。すなわち、本発明者は、反射形ケーシングの底壁
面について、冷陰極低圧放電ランプの平面的な装着配置
の領域（凹面部）、この凹面部に対して主反射面をなす
領域（凸面部）の傾斜角度、および反射層などを種々検
討を進めた。その結果、主反射面の角度をほぼ45°に設
定し、かつその反射面を鏡面反射層としたとき、放電ラ
ンプの発光部直上（真上）の高輝度に対し、放電ランプ
発光部間も高い輝度を呈して、平面的な輝度ムラが大幅
に低減・解消するとともに、拡散透過板を介して放射さ
れる光量も増大することを確認した。そして、この知見
に基づいて、全面的に、輝度がほぼ一様で、高品質な液
晶表示をすることができる照明装置を提供するに至った
ものである。That is, according to the present invention, the inner bottom wall surface of the reflective casing is formed as an uneven surface in a certain direction, and the cold cathode low-pressure discharge lamp is mounted and arranged in the concave area. The main point is that the reflection surface is set to a reflection surface with a 45 ° inclination angle and the reflection surface is a specular reflection layer. And by adopting such a configuration,
This is a high-quality, high-performance lighting device that not only eliminates and reduces the luminance unevenness of visible light generated by the cold cathode low-pressure discharge lamp, but also increases the reflection efficiency and the amount of light. The present invention has been made based on the following background. That is, the inventor of the present invention has determined that, on the bottom wall surface of the reflective casing, a region (concave portion) where the cold cathode low-pressure discharge lamp is mounted in a planar manner (a concave portion) and a region (convex portion) that forms a main reflection surface with respect to this concave portion. Various studies were conducted on the tilt angle, the reflection layer, and the like. As a result, when the angle of the main reflection surface is set to approximately 45 ° and the reflection surface is a mirror reflection layer, the brightness between the discharge lamp light emitting portions and the high brightness immediately above (directly above) the light emitting portions of the discharge lamp is high. It was confirmed that high luminance was exhibited, planar luminance unevenness was significantly reduced and eliminated, and the amount of light radiated through the diffusion transmission plate was also increased. Based on this finding, the present invention has provided an illuminating device capable of performing high-quality liquid crystal display with substantially uniform luminance over the entire surface.
【００１４】本発明において、反射形ケーシングは、た
とえばポリカーボネート樹脂，ポリカーボネート樹脂を
主成分としたポリブタジェンアクリルニトリル樹脂との
混合系などを素材として形成される。また、その内底壁
面に、一定の方向に（ストライブ状に）形設される凹凸
の反射面は、凹面領域が平面状の冷陰極低圧放電ランプ
の発光部を配置・装着部となり、凸面領域が発光部側面
側に対して反射体として機能する。したがって、凹面領
域の数，幅，長さおよび凸面領域の数，高さ，間隔など
は、冷陰極低圧放電ランプの平面的な形状，管径，管長
などによって、適宜，選択・設定される。一般的に、外
管径 4〜 5mm程度の冷陰極低圧放電ランプの場合、凹面
領域の幅は 100× 100mm程度、凸面領域の間隔は14〜18
mm程度で高さ 7〜 9mm程度である。In the present invention, the reflective casing is made of, for example, a polycarbonate resin or a mixture of a polybutadiene acrylonitrile resin containing a polycarbonate resin as a main component. In addition, the concave and convex reflecting surface formed in a certain direction (in the form of a stripe) on the inner bottom wall surface serves as an arrangement / mounting portion for a light emitting portion of a cold cathode low pressure discharge lamp having a flat concave surface region. The region functions as a reflector on the side of the light emitting unit. Therefore, the number, width and length of the concave regions and the number, height and spacing of the convex regions are appropriately selected and set according to the planar shape, tube diameter, tube length and the like of the cold cathode low pressure discharge lamp. Generally, in the case of a cold cathode low pressure discharge lamp having an outer tube diameter of about 4 to 5 mm, the width of the concave area is about 100 × 100 mm, and the interval between the convex areas is 14 to 18 mm.
The height is about 7 to 9 mm in mm.
【００１５】本発明において、前記反射形ケーシング内
底壁面の凹部に配置され、平面状の発光部を形成する冷
陰極低圧放電ランプは、いわゆる、冷陰極型蛍光ランプ
であり、その形状は、たとえば直管形の並列配置，平面
的なＵ字形，Ｗ字形，Ｕ字形同士の組み合わせ，Ｗ字形
同士の組み合わせ，せもしくはＵ字形とＷ字形との組み
合わせなどが挙げられる。In the present invention, the cold-cathode low-pressure discharge lamp, which is disposed in the recess on the inner bottom wall surface of the reflective casing and forms a planar light-emitting portion, is a so-called cold-cathode fluorescent lamp. A straight pipe-shaped parallel arrangement, a planar U-shape, a W-shape, a combination of U-shapes, a combination of W-shapes, or a combination of a U-shape and a W-shape are exemplified.
【００１６】本発明において、反射形ケーシング内底壁
の凸部面に形設・配置された鏡面反射膜は、鏡面化が可
能な金属製なら特に限定されないが、銀および銀化合物
が好ましい。また、その膜厚は10〜30μm 程度でよく、
たとえば蒸着法やスパッタリングなどによって形成する
ことができる。ただし、この鏡面反射膜は、45± 3°よ
り好ましくは45°の角度に傾斜・設定している必要があ
る。さらに、反射形ケーシングの開口部に着脱自在に装
着される拡散透過板は、たとえばポリカーボネード樹脂
板，アクリル樹脂板，ガラス板など透光性板であり、通
常、厚さ 1〜 2mm程度の透光性樹脂板が使用される。In the present invention, the specular reflection film formed and arranged on the convex surface of the inner bottom wall of the reflection casing is not particularly limited as long as it is made of a metal which can be mirror-finished, but silver and a silver compound are preferable. Further, the film thickness may be about 10 to 30 μm,
For example, it can be formed by an evaporation method or sputtering. However, the specular reflection film needs to be inclined and set at an angle of 45 ± 3 °, more preferably 45 °. Further, the diffusion transmission plate detachably attached to the opening of the reflection type casing is, for example, a light transmission plate such as a polycarbonate resin plate, an acrylic resin plate, and a glass plate. Resin plate is used.
【００１７】[0017]
【発明の実施の形態】以下、図１，図２，図３および図
４を参照して実施例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. 1, 2, 3 and 4. FIG.
【００１８】図１は、照明装置の基本的な構成を示す透
視的な平面図、また、図２は図１のA− A線に沿った断
面図である。図１および図２において、８はポリカーボ
ネート樹脂製の反射形ケーシングであって、前面が開口
され、底壁面8aが反射面を成す浅い皿形状を成してい
る。ここで、反射形ケーシング８の底壁面8aには、スト
ライブ状に幅 7mmの凹面領域8a′および高さ 4mmで，側
面の傾斜角度が45°の凸面領域8bが交互に形設・配置さ
れており、かつ凸面領域8bの各傾斜面には銀の蒸着によ
って鏡面反射層8cが形成それている。FIG. 1 is a perspective plan view showing a basic configuration of the lighting apparatus, and FIG. 2 is a sectional view taken along line AA of FIG. In FIGS. 1 and 2, reference numeral 8 denotes a reflective casing made of a polycarbonate resin, which has a shallow dish shape having an open front surface and a bottom wall surface 8a serving as a reflective surface. Here, on the bottom wall surface 8a of the reflection type casing 8, a concave area 8a 'having a width of 7 mm and a convex area 8b having a height of 4 mm and a side surface inclination angle of 45 ° are alternately formed and arranged in a stripe shape. In addition, a mirror reflection layer 8c is formed on each inclined surface of the convex region 8b by vapor deposition of silver.
【００１９】また、９は前記反射形ケーシング８底壁面
8aの凹面領域8a′に装着配置された平面形の冷陰極放電
ランプであり、この冷陰極放電ランプ９は、Ｕ字形の冷
陰極蛍光ランプを組合わせで構成されている。すなわ
ち、外径 3〜 4mm，全長 200〜260mmのＵ字形冷陰極蛍
光ランプ複数本を、上記図５に図示した場合と同様に接
続用端子部で直列に接続し、両端を給電端子として形成
してある。9 is a bottom wall of the reflection type casing 8
The cold cathode discharge lamp 9 is a flat cold cathode discharge lamp mounted and arranged in the concave area 8a 'of 8a. The cold cathode discharge lamp 9 is formed by combining a U-shaped cold cathode fluorescent lamp. That is, a plurality of U-shaped cold-cathode fluorescent lamps having an outer diameter of 3 to 4 mm and a total length of 200 to 260 mm are connected in series at the connection terminal portions as in the case shown in FIG. It is.
【００２０】そして、この実施形態においては、上記図
５に図示した構成に準じて、冷陰極低圧放電ランプ９の
給電端子側に装着・配置したランプホルダーを、反射形
ケーシング８の側壁部に一体的に設置された支持機構に
よって、挟着的に支持する一方、冷陰極低圧放電ランプ
９の屈曲部などを係止片で係止し、平面的に配置・装着
され、さらに、前記反射形ケーシング８の開口部に合成
樹脂系の拡散透過板10を着脱自在に装着し、照明装置を
構成している。In this embodiment, a lamp holder mounted and arranged on the power supply terminal side of the cold-cathode low-pressure discharge lamp 9 according to the configuration shown in FIG. While being supported in a sandwiched manner by a supporting mechanism that is installed in place, a bent portion of the cold cathode low-pressure discharge lamp 9 is locked by a locking piece, and is arranged and mounted in a planar manner. A synthetic resin-based diffused transmission plate 10 is detachably attached to the opening 8 to constitute an illumination device.
【００２１】上記構成の照明装置を点灯し、その拡散透
過板10を介して放射される配光特性を測定・評価したと
ころ、図３に示すように、ほとんど輝度ムラのない配光
特性であった。すなわち、この平板形の照明装置におけ
る配光特性は、冷陰極放電ランプ９，傾斜角度45°の鏡
面反射層8cおよび拡散透過板10に左右される。When the illuminating device having the above configuration was turned on, and the light distribution characteristics radiated through the diffuse transmission plate 10 were measured and evaluated. As shown in FIG. 3, the light distribution characteristics showed almost no luminance unevenness. Was. That is, the light distribution characteristics of this flat-plate type illumination device depend on the cold cathode discharge lamp 9, the specular reflection layer 8c having an inclination angle of 45 °, and the diffusion transmission plate 10.
【００２２】ところで、冷陰極放電ランプ９の発光は、
図４に、拡大して模式的に示すごとく、冷陰極放電ラン
プ９から出射して直接拡散透過板10に向かう光と、反射
形ケーシング８底壁面8a（ストライブ状の凹凸面）の鏡
面反射層8cで反射して拡散透過板10に向かう光とが拡散
透過板10を通過する。このとき、底壁面8aの反射層は、
反射効率の高い鏡面反射層8cで、かつ冷陰極放電ランプ
９の発光部に対して45°の角度で対向しているため、発
光部において側面側に出射した光のほとんどは反射し、
拡散透過板10に向かうことになる。The light emission of the cold cathode discharge lamp 9 is as follows.
As schematically shown in FIG. 4 on an enlarged scale, the light emitted from the cold cathode discharge lamp 9 and directly directed to the diffuse transmission plate 10 and the specular reflection of the bottom wall surface 8a of the reflective casing 8 (stripe-shaped uneven surface). The light reflected by the layer 8c and traveling toward the diffuse transmission plate 10 passes through the diffusion transmission plate 10. At this time, the reflection layer on the bottom wall surface 8a is
Since the mirror reflection layer 8c having a high reflection efficiency and facing the light emitting portion of the cold cathode discharge lamp 9 at an angle of 45 °, most of the light emitted to the side surface in the light emitting portion is reflected,
It will be directed to the diffuse transmission plate 10.
【００２３】換言すると、実際の光源である冷陰極放電
ランプ９に対し、鏡面反射層8cが見掛上の光源（疑似ラ
ンプ）として機能して、隣接する冷陰極放電ランプ９の
発光部間の低輝度化を容易に回避ないし抑止する。In other words, the mirror reflection layer 8c functions as an apparent light source (pseudo lamp) with respect to the cold cathode discharge lamp 9 which is an actual light source, so that the space between the light emitting portions of the adjacent cold cathode discharge lamps 9 is provided. Easily avoid or suppress low brightness.
【００２４】また、この照明装置を点灯したとき、拡散
透過板10を介して放射される光量は、約 300lm（ルーメ
ン）であり、前記した従来の平板形照明装置の構成を採
った場合に比べて 1.5〜 2.0倍であり、明るさの点でも
すぐれていた。When the lighting device is turned on, the amount of light radiated through the diffusion transmission plate 10 is about 300 lm (lumen), which is smaller than that of the above-mentioned conventional flat lighting device. 1.5 to 2.0 times, and it was also excellent in terms of brightness.
【００２５】したがって、拡散透過板10を介して放射さ
れる配光特性は、冷陰極放電ランプ９の装着位置や冷陰
極放電ランプ９の発光部間に関係なく、全面的にほぼ一
様な輝度（輝度ムラのない）で、かつ視認性の良好な液
晶表示面を照射することができる。Therefore, the light distribution characteristic radiated through the diffusion transmission plate 10 has substantially uniform luminance over the entire surface irrespective of the mounting position of the cold cathode discharge lamp 9 and between the light emitting portions of the cold cathode discharge lamp 9. It is possible to irradiate a liquid crystal display surface (without luminance unevenness) with good visibility.
【００２６】なお、この構成例においては、鏡面反射層
8cの傾斜角度を45°としたが、43〜47°の範囲では、ほ
ぼ同様の作用効果が得られる。さらに、上記構成例で
は、反射型ケーシング８の底壁面8aにストライブ状に設
けた側面の傾斜角度が45°の凸面領域8b面に銀を蒸着し
て鏡面反射層8cを形成したが、凸面領域8b側面の傾斜角
度はほぼ45°でなくとも、最終的に形成した鏡面反射層
8cがほぼ45°の傾斜角度を有する形態，構造を採ってい
れば、上記構成の場合と同様の作用効果が得られる。In this configuration example, the specular reflection layer
Although the inclination angle of 8c is set to 45 °, substantially the same operation and effect can be obtained in the range of 43 to 47 °. Furthermore, in the above configuration example, the mirror surface reflection layer 8c is formed by depositing silver on the surface of the convex region 8b in which the inclination angle of the side surface provided on the bottom wall surface 8a of the reflective casing 8 is 45 ° and the inclination angle is 45 °. Even if the inclination angle of the side surface of the region 8b is not approximately 45 °, the finally formed specular reflection layer
If the form and structure of 8c have an inclination angle of about 45 °, the same operation and effect as in the above configuration can be obtained.
【００２７】本発明は、上記例示の構成に限定されるも
のでなく、発明の趣旨を逸脱しない範囲でいろいろの変
形を採ることができる。たとえば冷陰極放電ランプは、
Ｕ字形蛍光ランプの組み合わせの代りに、Ｗ字形蛍光ラ
ンプを用いてもよいし、あるいは直管形蛍光ランプを並
列的に配置した構成を採ることもできる。また、鏡面反
射層も、銀の蒸着層の代りにスパッター層でもよいし、
銀の代りに、銀径の合金や銀合金で形成してもよい。The present invention is not limited to the configuration described above, and various modifications can be made without departing from the spirit of the invention. For example, a cold cathode discharge lamp
Instead of the combination of the U-shaped fluorescent lamps, a W-shaped fluorescent lamp may be used, or a configuration in which straight tube fluorescent lamps are arranged in parallel may be employed. Also, the specular reflection layer may be a sputtered layer instead of the silver deposition layer,
Instead of silver, an alloy having a silver diameter or a silver alloy may be used.
【００２８】[0028]
【発明の効果】本発明に係る照明装置によれば、ほぼ45
°に設定した鏡面反射層が疑似ランプとして作用するこ
とによって、放電ランプ発光部間も放電ランプの発光部
直上（真上）の高輝度に匹敵する高い輝度を呈し、平面
的な輝度ムラが大幅に低減・解消された放射光が得られ
る。また、拡散透過板を介して放射される光量も増大す
るので、前記高輝度で、かつ輝度ムラのなさと相俟っ
て、直下式液晶バックライトとして使用において、高品
質な液晶表示を可能とする照明装置が提供される。According to the lighting device of the present invention, approximately 45
The mirror reflection layer set to ° acts as a pseudo-lamp, which gives a high brightness comparable to the high brightness just above (directly above) the light-emitting part of the discharge lamp between the light-emitting parts of the discharge lamp, greatly reducing unevenness in planar brightness. Thus, radiation light reduced and eliminated can be obtained. In addition, since the amount of light radiated through the diffusion transmission plate is also increased, high-quality liquid crystal display can be realized when used as a direct-type liquid crystal backlight in combination with the high luminance and the non-uniform luminance. A lighting device is provided.
【図１】本発明に係る照明装置の要部構成例を透視的に
示す平面図。FIG. 1 is a plan view perspectively showing an example of a configuration of a main part of a lighting device according to the present invention.
【図２】図１の A-A線に沿った断面図。FIG. 2 is a sectional view taken along the line AA of FIG. 1;
【図３】図１に図示した照明装置の照射光の配光特性例
図。FIG. 3 is a diagram showing an example of light distribution characteristics of irradiation light of the illumination device shown in FIG. 1;
【図４】図３に図示した配光特性についての模式的な説
明図。FIG. 4 is a schematic explanatory diagram of the light distribution characteristics shown in FIG.
【図５】従来の照明装置の要部構成を展開して示す斜視
図。FIG. 5 is an exploded perspective view showing a configuration of a main part of a conventional lighting device.
【図６】(a)は従来の照明装置の照射光の配光特性図，
(b)はその照明装置の概略構成を示す断面図。FIG. 6A is a light distribution characteristic diagram of irradiation light of a conventional lighting device,
(b) is a sectional view showing a schematic configuration of the lighting device.
【図７】(a)は従来の照明装置の他の概略構成を示す断
面図、 (b)はこの照明装置の照射光の配光特性図。7A is a cross-sectional view illustrating another schematic configuration of a conventional lighting device, and FIG. 7B is a light distribution characteristic diagram of irradiation light of the lighting device.
１，８……反射形ケーシング 1a，8a……底壁面 1b，8b……凸面領域 1c……係子片 ２，９……冷陰極放電ランプ（蛍光ランプ） 2a……屈曲部 ３……接続用端子部 ４……ランプホルダー ５，10……光拡散透過板 ６……支持機構（支持溝） ７……アルミ反射層 8a′……凹面領域 8c……鏡面反射層 1, 8 ... reflective casing 1a, 8a ... bottom wall surface 1b, 8b ... convex area 1c ... armature piece 2, 9 ... cold cathode discharge lamp (fluorescent lamp) 2a ... bent portion 3 ... connection Terminal part 4 ... Lamp holder 5,10 ... Light diffusion transmission plate 6 ... Support mechanism (support groove) 7 ... Aluminum reflection layer 8a '... Concave area 8c ... Mirror reflection layer
Claims (4)
面が一定の方向に凹凸の反射面化した反射形ケーシング
と、 前記反射形ケーシング内底壁面の凹部に配置され、平面
状の発光部を形成する冷陰極低圧放電ランプと、 前記反射形ケーシングの凸部面に形設・配置された鏡面
反射膜と、 前記反射形ケーシングの開口部に着脱自在に装着される
拡散透過板とを有する照明装置であって、 前記凸部面に形設・配置された鏡面反射膜がほぼ45°の
角度で傾斜していることを特徴とする照明装置。1. A reflective casing having a front surface formed to be openable and an inner bottom wall having a concave and convex reflecting surface in a predetermined direction, and a planar light emitting device disposed in a concave portion of the inner wall surface of the reflective casing. A cold-cathode low-pressure discharge lamp forming a portion, a specular reflection film formed and arranged on a convex surface of the reflection type casing, and a diffusion transmission plate detachably mounted on an opening of the reflection type casing. The specular reflection film formed and arranged on the convex surface is inclined at an angle of approximately 45 °.
面が一定の方向に凹凸の反射面化した反射形ケーシング
と、 前記反射形ケーシング内底壁面の凹部に配置され、平面
状の発光部を形成する冷陰極低圧放電ランプと、 前記反射形ケーシングの凸部面に形設・配置された鏡面
反射膜と、 前記反射形ケーシングの開口部に着脱自在に装着される
拡散透過板とを有する照明装置であって、 前記凸部面がほぼ45°の傾斜面を成し、かつこの傾斜面
に鏡面反射膜が被着・形設されていることを特徴とする
照明装置。2. A reflective casing having a front surface formed so as to be openable and an inner bottom wall surface having a reflecting surface having irregularities in a predetermined direction, and a light emitting element disposed in a concave portion of the inner bottom wall surface of the reflective casing and having a planar light emission. A cold-cathode low-pressure discharge lamp forming a portion, a specular reflection film formed and arranged on a convex surface of the reflection type casing, and a diffusion transmission plate detachably mounted on an opening of the reflection type casing. An illumination device, comprising: a convex surface forming an approximately 45 ° inclined surface, and a specular reflection film attached and formed on the inclined surface.
成されていることを特徴とする請求項１もしくは請求項
２記載の照明装置。3. The lighting device according to claim 1, wherein the specular reflection film is formed of silver or a silver compound.
で平面状化されていることを特徴とする請求項１ないし
請求項３いずれか一記載の照明装置。4. The lighting device according to claim 1, wherein the cold-cathode low-pressure discharge lamp is flattened at a U-shaped bent portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8191948A JPH1039808A (en) | 1996-07-22 | 1996-07-22 | Illumination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8191948A JPH1039808A (en) | 1996-07-22 | 1996-07-22 | Illumination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1039808A true JPH1039808A (en) | 1998-02-13 |
Family
ID=16283129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8191948A Withdrawn JPH1039808A (en) | 1996-07-22 | 1996-07-22 | Illumination device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1039808A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003009265A1 (en) * | 2001-07-19 | 2003-01-30 | Moneyne Co., Ltd. | Advertizing device using the cold cathode fiuroescent lamps |
| JP2006185908A (en) * | 2004-12-27 | 2006-07-13 | Samsung Electronics Co Ltd | Container, backlight assembly and display device having the same |
| KR100611534B1 (en) * | 2000-03-30 | 2006-08-10 | 삼성전자주식회사 | Direct lighting type liquid crystal display |
| US7106394B2 (en) | 2003-03-27 | 2006-09-12 | Nec Lcd Technologies, Ltd. | Backlight unit in a liquid crystal display device |
| JP2006294507A (en) * | 2005-04-13 | 2006-10-26 | Sumitomo Rubber Ind Ltd | Illumination device and reflection plate for illumination device use for the same |
| JP2007073194A (en) * | 2005-09-02 | 2007-03-22 | Mitsubishi Electric Corp | Direct backlight device and thin display device |
| US7303325B2 (en) | 2003-11-18 | 2007-12-04 | Sharp Kabushiki Kaisha | Illumination device and display apparatus including the same |
| JP2008110160A (en) * | 2006-10-31 | 2008-05-15 | Daiichi Shokai Co Ltd | Pachinko game machine |
| US7377677B2 (en) | 2005-03-09 | 2008-05-27 | Samsung Electronics Co., Ltd. | Backlight assembly with excellent light efficiency and display device having the same |
| US7438436B2 (en) | 2005-08-05 | 2008-10-21 | Lg Display Co., Ltd. | Backlight unit |
| CN100432747C (en) * | 2006-02-08 | 2008-11-12 | 中华映管股份有限公司 | Back lighting module and lighting mixed module there of |
| JP2008299173A (en) * | 2007-06-01 | 2008-12-11 | Hitachi Ltd | Video display device and backlight unit used for the same |
| JP2011081929A (en) * | 2009-10-05 | 2011-04-21 | Hitachi Consumer Electronics Co Ltd | Backlight unit, and liquid crystal display using the same |
-
1996
- 1996-07-22 JP JP8191948A patent/JPH1039808A/en not_active Withdrawn
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100611534B1 (en) * | 2000-03-30 | 2006-08-10 | 삼성전자주식회사 | Direct lighting type liquid crystal display |
| WO2003009265A1 (en) * | 2001-07-19 | 2003-01-30 | Moneyne Co., Ltd. | Advertizing device using the cold cathode fiuroescent lamps |
| US7106394B2 (en) | 2003-03-27 | 2006-09-12 | Nec Lcd Technologies, Ltd. | Backlight unit in a liquid crystal display device |
| CN1312520C (en) * | 2003-03-27 | 2007-04-25 | Nec液晶技术株式会社 | Poor light apparatus and liquid crystal display |
| US7303325B2 (en) | 2003-11-18 | 2007-12-04 | Sharp Kabushiki Kaisha | Illumination device and display apparatus including the same |
| KR100793504B1 (en) * | 2003-11-18 | 2008-01-14 | 샤프 가부시키가이샤 | Illumination device and display apparatus including the same |
| US7703964B2 (en) | 2003-11-18 | 2010-04-27 | Sharp Kabushiki Kaisha | Illumination device and display apparatus including the same |
| JP2006185908A (en) * | 2004-12-27 | 2006-07-13 | Samsung Electronics Co Ltd | Container, backlight assembly and display device having the same |
| TWI406042B (en) * | 2004-12-27 | 2013-08-21 | Samsung Display Co Ltd | Receiving container, backlight assembly having the receiving container, and display device having the backlight assembly |
| US7377677B2 (en) | 2005-03-09 | 2008-05-27 | Samsung Electronics Co., Ltd. | Backlight assembly with excellent light efficiency and display device having the same |
| JP2006294507A (en) * | 2005-04-13 | 2006-10-26 | Sumitomo Rubber Ind Ltd | Illumination device and reflection plate for illumination device use for the same |
| US7438436B2 (en) | 2005-08-05 | 2008-10-21 | Lg Display Co., Ltd. | Backlight unit |
| JP4595756B2 (en) * | 2005-09-02 | 2010-12-08 | 三菱電機株式会社 | Direct type backlight device and thin display device |
| JP2007073194A (en) * | 2005-09-02 | 2007-03-22 | Mitsubishi Electric Corp | Direct backlight device and thin display device |
| CN100432747C (en) * | 2006-02-08 | 2008-11-12 | 中华映管股份有限公司 | Back lighting module and lighting mixed module there of |
| JP2008110160A (en) * | 2006-10-31 | 2008-05-15 | Daiichi Shokai Co Ltd | Pachinko game machine |
| JP2008299173A (en) * | 2007-06-01 | 2008-12-11 | Hitachi Ltd | Video display device and backlight unit used for the same |
| JP2011081929A (en) * | 2009-10-05 | 2011-04-21 | Hitachi Consumer Electronics Co Ltd | Backlight unit, and liquid crystal display using the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH1039808A (en) | Illumination device | |
| JP2007080702A (en) | Backlight unit | |
| JP2004206906A (en) | Backlight | |
| JP2004165031A (en) | Flat light source device | |
| JP2573282B2 (en) | Lighting device for liquid crystal display | |
| JPH11329040A (en) | Back surface lighting device | |
| JPH01515A (en) | LCD lighting device | |
| JP2000066200A (en) | Liquid crystal display device | |
| JP3248890B2 (en) | Backlight device | |
| JP2003215581A (en) | Liquid crystal display device | |
| JP2874418B2 (en) | Lighting equipment | |
| JP3494687B2 (en) | Backlight device for liquid crystal | |
| JPH06110057A (en) | Liquid crystal display device | |
| JP2004127928A (en) | Backlight device for liquid crystal display | |
| JPH08298100A (en) | Discharge lamp device and lighting system | |
| JP2002372918A (en) | Surface light source device and display device having the same | |
| JPH0593911A (en) | Illuminating device for liquid crystal | |
| CN117908181B (en) | Side-in type backlight module and liquid crystal display | |
| JPH052165A (en) | Lighting device | |
| JP2000241814A (en) | Liquid crystal display device and its back light | |
| JP3447864B2 (en) | Lighting device, backlight and liquid crystal display device | |
| JPH11273436A (en) | Back light device | |
| JP2006054126A (en) | Surface light source device | |
| TW556449B (en) | Illumination device | |
| JP2003346537A (en) | Planar light emitting device and display device using it |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20031007 |