JP2001236811A - Illumination device - Google Patents
Illumination deviceInfo
- Publication number
- JP2001236811A JP2001236811A JP2000052162A JP2000052162A JP2001236811A JP 2001236811 A JP2001236811 A JP 2001236811A JP 2000052162 A JP2000052162 A JP 2000052162A JP 2000052162 A JP2000052162 A JP 2000052162A JP 2001236811 A JP2001236811 A JP 2001236811A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- guide plate
- lighting device
- source rod
- 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.)
- Pending
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Led Device Packages (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は発光ダイオードを光
源ロッドに付設して成る光源の発生する光を導光板を介
して被照明物に照射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 for irradiating an object to be illuminated with light generated by a light source having a light emitting diode attached to a light source rod via a light guide plate.
【０００２】[0002]
【従来の技術】液晶表示装置が数多くの製品に使用され
ているが、液晶表示装置は自己発光能力がないために、
表示面側から光を照射するフロントライト型照明装置、
あるいは、表示面とは反対の反表示面側から光を照射す
るバックライト型照明装置が必要である。そこで、例え
ば、パソコンの表示面等の比較的大きな物に液晶表示装
置を使用する場合は冷陰極管を光源として用い、冷陰極
管の発した光を導光板を介して液晶表示装置の表示面ま
たは反表示面に向けて出射するフロントライト型、ある
いは、バックライト型照明装置が使用されている。2. Description of the Related Art Liquid crystal display devices are used in many products.
A front light-type lighting device that irradiates light from the display surface side,
Alternatively, a backlight-type lighting device that irradiates light from the side opposite to the display surface opposite to the display surface is required. Therefore, for example, when a liquid crystal display device is used for a relatively large object such as a display surface of a personal computer, a cold cathode tube is used as a light source, and light emitted from the cold cathode tube is transmitted through a light guide plate to the display surface of the liquid crystal display device. Alternatively, a front-light-type or backlight-type illumination device that emits light toward an opposite display surface is used.
【０００３】しかしながら、携帯電話等の小さい物に使
用されている液晶表示装置を照明する場合には冷陰極管
は大き過ぎるので、発光ダイオード（以下ＬＥＤとい
う）を光源ロッドに付設したものを光源とし、光源ロッ
ドから出た光を導光板を介して液晶表示装置の表示面ま
たは反表示面に向けて出射するフロントライト用、ある
いは、バックライト用照明装置が使用されている。例え
ば、特開平１１−１８４３８６号に開示されたフロント
ライト用照明装置がある。However, when illuminating a liquid crystal display device used for a small object such as a mobile phone, a cold-cathode tube is too large, so that a light-emitting diode (hereinafter referred to as an LED) attached to a light source rod is used as a light source. A lighting device for a front light or a backlight for emitting light emitted from a light source rod toward a display surface or a non-display surface of a liquid crystal display device via a light guide plate is used. For example, there is a lighting device for a front light disclosed in Japanese Patent Application Laid-Open No. 11-184386.
【０００４】このような照明装置では、ＬＥＤが点状に
発光するものであるので、このＬＥＤから発した点状の
光を導光板の入射面にできるだけ均等に入射せしめるこ
とが重要であって、前記公報の照明装置では光源ロッド
の導光板側面には拡散層が形成されていて、光源ロッド
の反導光板側に配設されたＬＥＤから出て光源ロッド内
部を通って導光板側に達した光を拡散層で拡散せしめて
から導光板の入射面に入射せしめるようにされている。
しかしながら、導光板側面に設けた拡散層だけでは均等
化が充分ではなく、前記公報の装置においても、実施例
では導光板の入射面にも拡散層が設けられており、ま
た、ＬＥＤも３個使用されている。In such a lighting device, since the LED emits light in a point-like manner, it is important that the point-like light emitted from the LED be made incident on the incident surface of the light guide plate as evenly as possible. In the illuminating device of the above publication, a diffusion layer is formed on the side of the light guide plate of the light source rod, and the light emitted from the LED disposed on the light guide plate side of the light source rod reaches the light guide plate side through the inside of the light source rod. The light is diffused by the diffusion layer and then incident on the light incident surface of the light guide plate.
However, equalization is not sufficient only with the diffusion layer provided on the side surface of the light guide plate. In the device of the above publication, the diffusion layer is also provided on the incident surface of the light guide plate in the embodiment, and three LEDs are also provided. It is used.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記問題に
鑑み、ＬＥＤの発した光を導光板を介して被照明物に照
射する照明装置の輝度の均等化を向上することを目的と
する。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to improve the equalization of the luminance of a lighting device that irradiates the object to be illuminated with light emitted from an LED via a light guide plate. .
【０００６】[0006]
【課題を解決するための手段】本発明によれば、光源か
ら出射された光を導光板の入射面から入射して、導光板
の入射面に直角な出射面から被照明物に向けて出射する
照明装置であって、光源は、点状に発光する発光ダイオ
ード（ＬＥＤ）を透明な光源ロッドに取り付けて形成さ
れており、光源ロッドは、反導光板側で導光板の入射面
の延伸方向である長手方向に延伸する第１面と、導光板
側で長手方向に延伸する第２面とを有し、ＬＥＤは光源
ロッドの第１面に設けた受光部に対向するように配設さ
れ、光源ロッドの第１面の受光部以外の領域に互いに平
行な稜線が長手方向に直交する厚さ方向に伸びるプリズ
ムアレイが形成され、光源ロッドの第２面の前記第１面
に設けた受光部の反対側の部分に、受光部から入射した
光を第１面に形成したプリズムアレイに向けて反射し得
る反射手段を設け、第２面の反射手段を設けない部分は
平面にしてある、照明装置が提供される。このように構
成された照明装置では、ＬＥＤが発した光は光源ロッド
の第１面の受光部から光源ロッドに入り、第２面の反射
手段で反射された第１面のプリズムアレイに向かって反
射し、プリズムアレイで反射した光は平面部から導光板
に向かって出射する。According to the present invention, light emitted from a light source enters from an incident surface of a light guide plate and is emitted from an exit surface perpendicular to the incident surface of the light guide plate toward an object to be illuminated. The light source is formed by attaching a light emitting diode (LED) that emits a point-like light to a transparent light source rod, and the light source rod extends in the direction of extension of the incident surface of the light guide plate on the counter light guide plate side. A first surface extending in the longitudinal direction, and a second surface extending in the longitudinal direction on the light guide plate side, and the LED is disposed so as to face a light receiving portion provided on the first surface of the light source rod. A prism array in which ridges parallel to each other extend in a thickness direction orthogonal to the longitudinal direction in a region other than the light receiving portion of the first surface of the light source rod, and a light receiving portion provided on the first surface of the second surface of the light source rod; Light incident from the light receiving part is formed on the first surface on the opposite side of the part The reflecting means may be reflected toward the prism array provided with the portion not provided with the reflecting means of the second surface is are the planar lighting device is provided. In the lighting device configured as described above, the light emitted from the LED enters the light source rod from the light receiving portion on the first surface of the light source rod, and travels toward the prism array on the first surface reflected by the reflection means on the second surface. The light reflected and reflected by the prism array exits from the plane portion toward the light guide plate.
【０００７】好ましくは、反射手段は第２面を第１面に
向けて抉って成る凹部とされ、より好ましくは、凹部は
ＬＥＤの発光中心に向って鋭く抉られた中央尖端部を有
する略三角形の凹部とされ、凹部が滑らかな裾広がりを
有するようにすれば尚更よい。[0007] Preferably, the reflecting means is a concave portion formed by making the second surface face the first surface, and more preferably, the concave portion is a substantially triangular shape having a central point sharply cut toward the light emission center of the LED. It is even better if the recess has a smooth skirt spread.
【０００８】好ましくは、凹部の中央尖端部にＬＥＤか
ら光源ロッド内に入射した光が反射手段で反射せずに導
光板に向けて直接出射することを防止する直接出射防止
手段が設けられる。Preferably, a direct emission preventing means is provided at the center point of the concave portion for preventing light incident on the light source rod from the LED from being emitted directly toward the light guide plate without being reflected by the reflecting means.
【０００９】好ましくは、ＬＥＤから長手方向に遠い遠
位領域の輝度低下を抑制する遠位領域輝度向上手段を有
し、それは、例えば、第１面のプリズムアレイのプリズ
ム配置ピッチをＬＥＤに近い領域ほど粗く、ＬＥＤに遠
い領域ほど密にしたり、第１面のプリズムアレイのプリ
ズムの谷の深さピッチをＬＥＤに近い領域ほど浅く、Ｌ
ＥＤに遠い領域ほど深くしたり、することで実現される
が、反射手段に遠位領域輝度向上手段の機能を含ませる
こともできる。[0009] Preferably, there is provided a distal region brightness improving means for suppressing a brightness reduction in a distal region farther from the LED in the longitudinal direction, for example, by setting a prism arrangement pitch of the first surface prism array to a region close to the LED. The coarser the area, the denser the area farther from the LED, or the shallower the pitch of the valleys of the prisms of the prism array on the first surface in the area closer to the LED.
This is realized by increasing or decreasing the depth of an area farther from the ED. However, the function of the brightness enhancement means of the distal area may be included in the reflection means.
【００１０】ＬＥＤは光源ロッドに密着して配設するこ
ともできるし、光源ロッドから離間して配設することも
できる。光源ロッドと導光板を一体成形すれば製造が格
段に容易になる。本発明の照明装置は、被照明物が液晶
表示装置であって、液晶表示装置を表側から照明するフ
ロントライト用の照明装置に用いることも、液晶表示装
置を裏側から照明するバックライト用の照明装置に用い
ることもできる。The LED can be disposed in close contact with the light source rod, or can be disposed separately from the light source rod. If the light source rod and the light guide plate are integrally formed, the production becomes much easier. The lighting device according to the present invention may be used for a front light illuminating device that illuminates the liquid crystal display device from the front side when the object to be illuminated is a liquid crystal display device, or for a backlight illuminating the liquid crystal display device from the back side. It can also be used in devices.
【００１１】[0011]
【発明の実施の形態】以下、図面を参照して本発明の実
施形態について説明する。はじめに第１の実施形態につ
いて説明する。図１が第１の実施形態の照明装置を概略
的に誇張して示した斜視図である。この照明装置は、例
えば、液晶表示装置を、その表示面の側から照明するフ
ロントライト方式で照明するための照明装置であって、
導光板５０と、導光板５０の入射面５１に向けて光を出
射する光源装置１０から成る。ここで、以下の説明を簡
潔にするために、図の右に付記したように、導光板５０
の入射面５１の延伸方向を長手方向と言い、導光板５０
の厚さ方向を単に厚さ方向と言い、導光板５０が光源装
置１０から離れるように延伸する方向を幅方向と言うこ
とにする。Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. FIG. 1 is a perspective view schematically showing the lighting device of the first embodiment in an exaggerated manner. This lighting device is, for example, a lighting device for illuminating a liquid crystal display device with a front light method of illuminating from a side of a display surface thereof,
It comprises a light guide plate 50 and a light source device 10 that emits light toward an incident surface 51 of the light guide plate 50. Here, for the sake of simplicity, the light guide plate 50 is attached as shown on the right side of the figure.
The direction of extension of the entrance surface 51 of the light guide plate 50 is referred to as the longitudinal direction.
Is simply referred to as the thickness direction, and the direction in which the light guide plate 50 extends away from the light source device 10 is referred to as the width direction.
【００１２】光源装置１０は光源ロッド２０とＬＥＤ４
０から成る。光源ロッド２０は屈折率が１．４５乃至
１．７７程度の、透明な、例えば、ＰＭＭＡ（ポリメチ
ルメタクリレート）のような樹脂で形成されていて、反
導光板側面２１と導光板側面２２を有する。反導光板側
面２１の長さ方向の中央部分には導光板５０の入射面５
１に平行な受光面２３が形成されていて、受光面２３に
ＬＥＤ４０が付設されているが、ＬＥＤ４０の光源ロッ
ド１０側以外の面は光が外側にもれないように反射処理
されている。なお、ＬＥＤ４０は例えば、白色、端面発
光のものが使用される。The light source device 10 includes a light source rod 20 and an LED 4
Consists of zero. The light source rod 20 is made of a transparent resin such as PMMA (polymethyl methacrylate) having a refractive index of about 1.45 to 1.77, and has a light guide plate side surface 21 and a light guide plate side surface 22. . The entrance surface 5 of the light guide plate 50 is located at the central portion in the longitudinal direction of the side surface 21 of the light guide plate.
A light receiving surface 23 parallel to 1 is formed, and an LED 40 is attached to the light receiving surface 23. The surface of the LED 40 other than the light source rod 10 side is subjected to reflection processing so that light does not go outside. The LED 40 is, for example, a white one that emits light at the edge.
【００１３】反導光板側面２１の受光面２３以外の領域
には、プリズムアレイ２４が形成されていて、プリズム
アレイ２４を構成する各プリズム２５の稜線２６と谷２
７は互いに平行に厚さ方向に延伸する。この第１の実施
の形態では、稜線２６は切頭されていて導光板５０の入
射面５１に平行な平面部を含んでいる。一方、光源ロッ
ド２０の導光板側面２２の、受光面２３の反対側の位置
には、三角形に切り欠いた凹部２８が形成されている。A prism array 24 is formed in a region other than the light receiving surface 23 of the side surface 21 of the light guide plate, and the ridges 26 and the valleys 2 of each prism 25 constituting the prism array 24 are formed.
7 extend in the thickness direction in parallel with each other. In the first embodiment, the ridge line 26 is truncated and includes a plane portion parallel to the incident surface 51 of the light guide plate 50. On the other hand, at the position on the opposite side of the light receiving surface 23 of the light guide plate side surface 22 of the light source rod 20, a concave portion 28 cut out in a triangle is formed.
【００１４】導光板５０は光源ロッド２０と同じような
透明な材料で形成されおり、導光板５０の表示物側の面
５２にはプリズムアレイ５３が形成されていて、プリズ
ムアレイ５３を構成する各プリズム５４の稜線５５と谷
線５６は互いに平行に長手方向に延伸する。The light guide plate 50 is formed of a transparent material similar to the light source rod 20, and a prism array 53 is formed on a surface 52 of the light guide plate 50 on the display object side. The ridge line 55 and the valley line 56 of the prism 54 extend in the longitudinal direction parallel to each other.
【００１５】図２は図１の照明装置を上方から見た上面
図であって、ＬＥＤ４０から出た光は破線矢印で示すよ
うな経路を辿って、導光板２０の入射面に達する。すな
わち、ＬＥＤ４０から出た光は光源ロッド２０の導光板
側面２２に形成された凹部２８の内面で色々な方向に反
射し、そこでからプリズムアレイ２４の各プリズム２５
の内面に向かい、そこで反射して、導光板側面２２から
出射して、導光板５０にその入射面５１から入射するの
である。FIG. 2 is a top view of the lighting device of FIG. 1 as viewed from above. Light emitted from the LED 40 follows a path indicated by a broken arrow and reaches the light incident surface of the light guide plate 20. That is, the light emitted from the LED 40 is reflected in various directions on the inner surface of the concave portion 28 formed on the side surface 22 of the light guide plate of the light source rod 20, and then reflected from each prism 25 of the prism array 24.
, And is reflected there, exits from the light guide plate side surface 22, and enters the light guide plate 50 from the incident surface 51 thereof.
【００１６】ここで、ＬＥＤ４０から出た光が光源ロッ
ド２０の凹部２８で反射せずに直接導光板５０の入射面
５１に向かって出射すると強く輝く部分が出来てしま
う、そこで、凹部２８の中央の太線で示す部分には直接
出射防止手段として、反射板２９が形成される。直接出
射防止手段としては、反射板の他、塗装処理、あるいは
光吸収体の設置等がある。第１の実施の形態は上記のよ
うに構成され作用するので導光板から出射する光が均等
化される。Here, when the light emitted from the LED 40 is emitted directly toward the incident surface 51 of the light guide plate 50 without being reflected by the concave portion 28 of the light source rod 20, a strongly shining portion is formed. A reflection plate 29 is formed as a direct emission prevention means in a portion indicated by a bold line. The direct emission preventing means includes, in addition to the reflection plate, a coating treatment or the installation of a light absorber. Since the first embodiment is configured and operates as described above, the light emitted from the light guide plate is equalized.
【００１７】図３は第２の実施の形態の特徴を示す図で
あって、第２の実施の形態は、同図に示されるように、
光源ロッド２０の凹部２８を三角形から裾を滑らかに拡
げた形状にした点が第１の実施の形態と異なるが他の部
分は変わらない。このようにすることにより、ＬＥＤ４
０から遠い領域の輝度が向上し、全体の輝度の均等化を
向上することができる。FIG. 3 is a diagram showing the features of the second embodiment. As shown in FIG.
The difference from the first embodiment lies in that the concave portion 28 of the light source rod 20 has a shape in which the skirt is smoothly expanded from a triangle, but the other portions are unchanged. By doing so, LED4
The brightness of the region far from 0 is improved, and the equalization of the entire brightness can be improved.
【００１８】図４は第３の実施の形態の特徴を示す図で
あって、第３の実施の形態は、同図に示されるように、
光源ロッド２０のプリズムアレイ２４をを構成するプリ
ズム２５を谷２７の深さは同じにしながら、長手方向の
谷２７のピッチｐn をＬＥＤ４０に近い程大きく、ＬＥ
Ｄ４０に遠い程小さくした点が第１の実施の形態と異な
るが他の部分は変わらない。このようにすることによ
り、ＬＥＤ４０から遠い領域の輝度が向上し、全体の輝
度の均等化を向上することができる。FIG. 4 is a diagram showing the features of the third embodiment. The third embodiment, as shown in FIG.
While the prism 25 constituting the prism array 24 of the light source rod 20 to the depth of the valleys 27 is the same, larger nearer the pitch p n in the longitudinal direction of the trough 27 to LED 40, LE
The difference from the first embodiment is that the distance is reduced as the distance from D40 increases, but the other parts remain unchanged. By doing so, the brightness in a region far from the LED 40 is improved, and the equalization of the entire brightness can be improved.
【００１９】図５は第４の実施の形態の特徴を示す図で
あって、第４の実施の形態は、同図に示されるように、
光源ロッド２０のプリズムアレイ２４をを構成するプリ
ズム２５の谷２７の深さｄn をＬＥＤ４０に近い領域で
は浅くし、ＬＥＤ４０に遠い領域では深くした点が第１
の実施の形態と異なるが他の部分は変わらない。このよ
うにすることにより、ＬＥＤ４０から遠い領域の輝度が
向上し、全体の輝度の均等化を向上することができる。FIG. 5 is a diagram showing the characteristics of the fourth embodiment. As shown in FIG.
The first point is that the depth d n of the valley 27 of the prism 25 constituting the prism array 24 of the light source rod 20 is made shallow in a region near the LED 40 and deep in a region far from the LED 40.
Although the present embodiment is different from the embodiment of FIG. By doing so, the brightness in a region far from the LED 40 is improved, and the equalization of the entire brightness can be improved.
【００２０】図６は第５の実施の形態の特徴を示す図で
あって、第５の実施の形態は、同図に示されるように、
光源ロッド２０のプリズムアレイ２４をを構成するプリ
ズム２５の稜線２６は切頭されておらず、また、ＬＥＤ
４０は受光面２３に密着されていない点が第１の実施の
形態と異なるが他の部分は変わらない。FIG. 6 is a diagram showing the features of the fifth embodiment. The fifth embodiment, as shown in FIG.
The ridge line 26 of the prism 25 constituting the prism array 24 of the light source rod 20 is not truncated, and
Reference numeral 40 differs from the first embodiment in that it is not in close contact with the light receiving surface 23, but the other parts remain the same.
【００２１】図７は第６の実施の形態の特徴を示す図で
あって、第６の実施の形態は、同図に示されるように、
第５の実施の形態に対して、谷２７が平面を有するよう
にされている点が異なるが他の部分は変わらない。FIG. 7 is a diagram showing the features of the sixth embodiment. The sixth embodiment, as shown in FIG.
The difference from the fifth embodiment lies in that the valley 27 has a flat surface, but the other portions remain unchanged.
【００２２】図８は第７の実施の形態の特徴を示す図で
あって、第７の実施の形態は、同図に示されるように、
この第７の実施の形態は、第６の実施の形態に対して、
ＬＥＤ４０を２個配設し、対応して凹部２８も２個設け
た点が異なる。このように、ＬＥＤ４０を２個配設する
ことにより、輝度の均等化が向上する。このように、Ｌ
ＥＤ４０を２個設けることは、第１〜第５の実施の形態
に対しても可能である。また、ＬＥＤ４０の数を必要に
応じて更に増やすことも可能である。FIG. 8 is a diagram showing the features of the seventh embodiment. As shown in FIG.
This seventh embodiment is different from the sixth embodiment in that
The difference is that two LEDs 40 are provided and two recesses 28 are provided correspondingly. Thus, by arranging two LEDs 40, the equalization of luminance is improved. Thus, L
Providing two EDs 40 is also possible for the first to fifth embodiments. Further, the number of LEDs 40 can be further increased as necessary.
【００２３】図９は第８の実施の形態の特徴を示す図で
あって、第８の実施の形態は、同図に示されるように、
この第８の実施の形態は、第１の実施の形態における光
源ロッド２０と導光板５０を一体で成形したものであ
る。このような構成とすることにより、光源ロッド２０
と導光板５０を別々に形成し、て所定位置に正確に配置
する必要がなく、製造が非常に簡単になる。第１〜第８
の実施の形態も、勿論、このように一体に成形すること
ができる。FIG. 9 is a diagram showing the features of the eighth embodiment. As shown in FIG.
In the eighth embodiment, the light source rod 20 and the light guide plate 50 in the first embodiment are integrally formed. With such a configuration, the light source rod 20
Since the light guide plate 50 and the light guide plate 50 need not be separately formed and accurately arranged at predetermined positions, the manufacture becomes very simple. 1st to 8th
Of course, the embodiment can also be integrally formed in this way.
【００２４】図１０は例えば、第１の実施形態の照明装
置を用いてフロントライト方式で液晶表示装置１００の
表示面を表側から照明する照明システムの全体を巾方向
から見た図である。なお、図１、２では示さなかった
が、この図１０に示されるように、光源ロッド２０の上
面と下面にはそれぞれリフレクタ３１、３２が付設さ
れ、リフレクタ３１、３２は導光板５０の入射面５１ま
で達していて、光源ロッド２０の導光板側面２２を出射
した光が逃げないようにしている。FIG. 10 is a view of the entire illumination system for illuminating the display surface of the liquid crystal display device 100 from the front side by the front light method using the illumination device of the first embodiment, as viewed from the width direction. Although not shown in FIGS. 1 and 2, as shown in FIG. 10, reflectors 31 and 32 are attached to the upper surface and the lower surface of the light source rod 20, respectively. The light emitted from the light guide plate side surface 22 of the light source rod 20 does not escape.
【００２５】同様に、図１１は例えば、第１の実施形態
の照明装置を用いてバックライト方式で液晶表示装置１
００の表示面を裏側から照明する照明システムの全体を
巾方向から見た図であって、導光板５０のプリズムアレ
イは液晶表示装置１００の反対側に配設されている。Similarly, FIG. 11 shows, for example, the liquid crystal display device 1 in a backlight system using the illumination device of the first embodiment.
FIG. 13 is a view of the entire illumination system for illuminating the display surface of No. 00 from the back side as viewed from the width direction, and the prism array of the light guide plate 50 is disposed on the opposite side of the liquid crystal display device 100.
【００２６】[0026]
【発明の効果】本発明による照明装置は、光源から出射
された光を導光板の入射面から入射して、導光板の入射
面に直角な出射面から被照明物に向けて出射する照明装
置であるが、光源は、ＬＥＤを光源ロッドに取り付けて
形成されており、光源ロッドは、反導光板側で導光板の
入射面の延伸方向である長手方向に延伸する第１面と、
導光板側で長手方向に延伸する第２面とを有し、ＬＥＤ
は光源ロッドの第１面に設けた受光部に対向するように
配設され、光源ロッドの第１面の受光部以外の領域に互
いに平行な稜線が長手方向に直交する厚さ方向に伸びる
プリズムアレイが形成され、光源ロッドの第２面の前記
第１面に設けた受光部の反対側の部分に、受光部から入
射した光を第１面に形成したプリズムアレイに向けて反
射し得る反射手段を設け、第２面の反射手段を設けない
部分は平面されていて、ＬＥＤが発した光は光源ロッド
の第１面の受光部から光源ロッドに入り、第２面の反射
手段で反射された第１面のプリズムアレイに向かって反
射し、プリズムアレイで反射した光は平面部から導光板
に向かって出射する。その結果、点状のＬＥＤから発し
た光を効率よく均等に導光板に入射させることができ、
ＬＥＤの数を多くすることなく導光板から均等な光を出
射することができる。According to the illumination device of the present invention, the light emitted from the light source enters from the incident surface of the light guide plate and exits from the exit surface perpendicular to the incident surface of the light guide plate toward the object to be illuminated. However, the light source is formed by attaching an LED to a light source rod, the light source rod has a first surface that extends in the longitudinal direction that is the direction of extension of the incident surface of the light guide plate on the counter light guide plate side,
An LED having a second surface extending in the longitudinal direction on the light guide plate side;
Is a prism disposed to face the light receiving portion provided on the first surface of the light source rod, and ridge lines parallel to each other extend in a thickness direction orthogonal to the longitudinal direction in a region other than the light receiving portion of the first surface of the light source rod. An array is formed, and a portion of the second surface of the light source rod, which is opposite to the light receiving portion provided on the first surface, can reflect light incident from the light receiving portion toward the prism array formed on the first surface. The light emitted by the LED enters the light source rod from the light receiving portion on the first surface of the light source rod, and is reflected by the light reflecting portion on the second surface. The light reflected toward the prism array on the first surface, and the light reflected from the prism array exits from the plane portion toward the light guide plate. As a result, the light emitted from the point-like LED can be efficiently and evenly incident on the light guide plate,
Even light can be emitted from the light guide plate without increasing the number of LEDs.
【図１】第１の実施形態の構成を示す斜視図である。FIG. 1 is a perspective view showing a configuration of a first embodiment.
【図２】第１の実施形態の上面図である。FIG. 2 is a top view of the first embodiment.
【図３】第２の実施形態の光源装置の構造を示す上面図
である。FIG. 3 is a top view illustrating a structure of a light source device according to a second embodiment.
【図４】第３の実施形態の光源装置の構造を示す上面図
である。FIG. 4 is a top view illustrating a structure of a light source device according to a third embodiment.
【図５】第４の実施形態の光源装置の構造を示す上面図
である。FIG. 5 is a top view illustrating a structure of a light source device according to a fourth embodiment.
【図６】第５の実施形態の光源装置の構造を示す上面図
である。FIG. 6 is a top view illustrating a structure of a light source device according to a fifth embodiment.
【図７】第６の実施形態の光源装置の構造を示す上面図
である。FIG. 7 is a top view illustrating a structure of a light source device according to a sixth embodiment.
【図８】第７の実施形態の光源装置の構造を示す上面図
である。FIG. 8 is a top view illustrating a structure of a light source device according to a seventh embodiment.
【図９】第８の実施形態の光源装置の構造を示す上面図
である。FIG. 9 is a top view illustrating a structure of a light source device according to an eighth embodiment.
【図１０】第１の実施形態の光源装置を利用して液晶表
示装置をフロントライト方式で照明する様子を示す図で
ある。FIG. 10 is a diagram illustrating a state in which a liquid crystal display device is illuminated by a front light method using the light source device of the first embodiment.
【図１１】第１の実施形態の光源装置を利用して液晶表
示装置をフロントライト方式で照明する様子を示す図で
ある。FIG. 11 is a diagram illustrating a state in which a liquid crystal display device is illuminated by a front light method using the light source device of the first embodiment.
１０…光源装置 ２０…光源ロッド ２４…プリズムアレイ ２８…凹部 ２９…拡散処理部 ４０…ＬＥＤ（発光ダイオード） ５０…導光板 １００…液晶表示装置 DESCRIPTION OF SYMBOLS 10 ... Light source device 20 ... Light source rod 24 ... Prism array 28 ... Concave part 29 ... Diffusion processing part 40 ... LED (light emitting diode) 50 ... Light guide plate 100 ... Liquid crystal display
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１２年３月１０日（２０００．３．１
０）[Submission date] March 10, 2000 (200.3.1.1)
0)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１２[Correction target item name] 0012
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００１２】光源装置１０は光源ロッド２０とＬＥＤ４
０から成る。光源ロッド２０は屈折率が１．４５乃至
１．７程度の、透明な、例えば、ＰＭＭＡ（ポリメチル
メタクリレート）のような樹脂で形成されていて、反導
光板側面２１と導光板側面２２を有する。反導光板側面
２１の長さ方向の中央部分には導光板５０の入射面５１
に平行な受光面２３が形成されていて、受光面２３にＬ
ＥＤ４０が付設されているが、ＬＥＤ４０の光源ロッド
１０側以外の面は光が外側にもれないように反射処理さ
れている。なお、ＬＥＤ４０は例えば、白色、端面発光
のものが使用される。The light source device 10 includes a light source rod 20 and an LED 4
Consists of zero. The light source rod 20 has a refractive index of 1.45 to
It is made of about 1.7 transparent resin such as PMMA (polymethyl methacrylate), and has a light guide plate side surface 21 and a light guide plate side surface 22. The incident surface 51 of the light guide plate 50 is located at the central portion in the longitudinal direction of the light guide plate side surface 21.
Are formed in parallel to the light receiving surface 23, and L
Although the ED 40 is provided, the surface of the LED 40 other than the light source rod 10 is subjected to a reflection treatment so that light does not flow outside. The LED 40 is, for example, a white one that emits light at the edge.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｆ２１Ｙ 101:02 Ｇ０２Ｆ 1/1335 ５３０ (72)発明者 手塚 貞雄 神奈川県横浜市都筑区川和町654番地 富 士通化成株式会社内 (72)発明者 平野 雅也 神奈川県横浜市都筑区川和町654番地 富 士通化成株式会社内 (72)発明者 古川 真悟 神奈川県横浜市都筑区川和町654番地 富 士通化成株式会社内 Ｆターム(参考） 2H038 AA55 BA06 CA68 2H091 FA21X FA21Z FA23X FA23Z FA45X FA45Z FD06 FD12 FD22 GA12 LA11 LA18 5F041 AA05 DA81 EE25 FF11 Continuation of the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) // F21Y 101: 02 G02F 1/1335 530 (72) Inventor Sadao Tezuka 654 Kawawa-cho, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Wealth Shitsu Kasei Co., Ltd. (72) Inventor Masaya Hirano Kanagawa Prefecture, Yokohama City, Kawazu-cho, Tsuzuki-ku, Yokohama, Japan (72) Inventor Shingo Furukawa 654 Kawawa-cho, Tsuzuki-ku, Yokohama, Kanagawa Prefecture, Wealth F-term (reference) in Shitsu Kasei Co., Ltd. 2H038 AA55 BA06 CA68 2H091 FA21X FA21Z FA23X FA23Z FA45X FA45Z FD06 FD12 FD22 GA12 LA11 LA18 5F041 AA05 DA81 EE25 FF11
Claims (14)
から入射して、導光板の入射面に直角な出射面から被照
明物に向けて出射する照明装置であって、 光源は点状に発光する発光ダイオードを透明な光源ロッ
ドに取り付けて形成されており、 光源ロッドは、反導光板側で導光板の入射面の延伸方向
である長手方向に延伸する第１面と、導光板側で長手方
向に延伸する第２面とを有し、 発光ダイオードは光源ロッドの第１面に設けた受光部に
対向するように配設され、 光源ロッドの第１面の受光部以外の領域に互いに平行な
稜線が長手方向に直交する厚さ方向に伸びるプリズムア
レイが形成され、 光源ロッドの第２面の前記第１面に設けた受光部の反対
側の部分に、受光部から入射した光を第１面に形成した
プリズムアレイに向けて反射し得る反射手段を設け、第
２面の反射手段を設けない部分は平面にしてある、 ことを特徴とする照明装置。1. An illuminating device for irradiating light emitted from a light source from an incident surface of a light guide plate to an illuminated object from an exit surface perpendicular to the incident surface of the light guide plate, wherein the light source is a point. A light emitting diode attached to a transparent light source rod, the light source rod being formed on a side opposite to the light guide plate, the first surface extending in the longitudinal direction which is the direction of extension of the incident surface of the light guide plate, and the light guide plate. A light-emitting diode is disposed to face a light-receiving portion provided on the first surface of the light source rod, and a region other than the light-receiving portion on the first surface of the light source rod. A prism array is formed in which ridges parallel to each other extend in the thickness direction perpendicular to the longitudinal direction. The prism array is incident on the portion of the second surface of the light source rod opposite to the light receiving portion provided on the first surface from the light receiving portion. Reflects light toward the prism array formed on the first surface Reflecting means provided that the portion provided with no reflection means second surface are on a plane, illumination device, characterized in that.
て成る凹部であることを特徴とする請求項１に記載の照
明装置。2. The lighting device according to claim 1, wherein the reflection means is a concave portion formed by making the second surface face the first surface.
て鋭く抉られた中央尖端部を有する略三角形の凹部であ
ることを特徴とする請求項２に記載の照明装置。3. The lighting device according to claim 2, wherein the concave portion is a substantially triangular concave portion having a central point sharply cut toward the light emission center of the light emitting diode.
とを特徴とする請求項３に記載の照明装置。4. The lighting device according to claim 3, wherein the recess has a smooth skirt.
光源ロッド内に入射した光が反射手段で反射せずに導光
板に向けて直接出射することを防止する直接出射防止手
段を設けたことを特徴とする請求項３に記載の照明装
置。5. A direct emission preventing means for preventing light incident on the light source rod from the light emitting diode from being directly reflected toward the light guide plate without being reflected by the reflecting means, is provided at a central point of the recess. The lighting device according to claim 3, wherein:
領域の輝度低下を抑制する遠位領域輝度向上手段を有す
ることを特徴とする請求項１に記載の照明装置。6. The illuminating device according to claim 1, further comprising a distal region luminance improving unit that suppresses a luminance decrease in a distal region farther from the light emitting diode in the longitudinal direction.
ムアレイのプリズム配置ピッチを発光ダイオードに近い
領域ほど粗く、発光ダイオードに遠い領域ほど密にして
成ることを特徴とする請求項６に記載の照明装置。7. The distal area brightness improving means according to claim 6, wherein the prism arrangement pitch of the prism array on the first surface is made coarser in a region closer to the light emitting diode and denser in a region farther from the light emitting diode. The lighting device according to the above.
ムアレイのプリズムの谷の深さピッチを発光ダイオード
に近い領域ほど浅く、発光ダイオードに遠い領域ほど深
くして成ることを特徴とする請求項６に記載の照明装
置。8. The distal area brightness improving means is characterized in that the depth pitch of the valleys of the prisms of the prism array on the first surface is made shallower in the area closer to the light emitting diode and deeper in the area farther from the light emitting diode. The lighting device according to claim 6.
を含んでいることを特徴とする請求項６に記載の照明装
置。9. The lighting device according to claim 6, wherein the reflecting means has a function of a distal area brightness enhancing means.
れていることを特徴とする請求項１に記載の照明装置。10. The lighting device according to claim 1, wherein the LED is disposed in close contact with the light source rod.
されていることを特徴とする請求項１に記載の照明装
置。11. The lighting device according to claim 1, wherein the LED is arranged apart from the light source rod.
いることを特徴とする請求項１に記載の照明装置。12. The lighting device according to claim 1, wherein the light source rod and the light guide plate are integrally formed.
晶表示装置を表側から照明するフロントライト用の照明
装置であることを特徴とする請求項１に記載の照明装
置。13. The lighting device according to claim 1, wherein the object to be illuminated is a liquid crystal display device, and is a lighting device for a front light that illuminates the liquid crystal display device from the front side.
晶表示装置を裏側から照明するバックライト用の照明装
置であることを特徴とする請求項１に記載の照明装置。14. The illumination device according to claim 1, wherein the object to be illuminated is a liquid crystal display device, and is a backlight illumination device for illuminating the liquid crystal display device from behind.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000052162A JP2001236811A (en) | 2000-02-23 | 2000-02-23 | Illumination device |
| DE60033264T DE60033264T2 (en) | 1999-12-28 | 2000-11-24 | Lighting apparatus for display |
| TW089125053A TW594072B (en) | 1999-12-28 | 2000-11-24 | Lighting apparatus |
| AT00310444T ATE353447T1 (en) | 1999-12-28 | 2000-11-24 | LIGHTING APPARATUS FOR DISPLAY |
| EP00310444A EP1113218B1 (en) | 1999-12-28 | 2000-11-24 | Lighting apparatus for a display |
| US09/722,102 US6474826B1 (en) | 1999-12-28 | 2000-11-27 | Lighting apparatus |
| KR10-2000-0079161A KR100396612B1 (en) | 1999-12-28 | 2000-12-20 | Lighting apparatus |
| CNB001355864A CN1148605C (en) | 1999-12-28 | 2000-12-20 | Lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000052162A JP2001236811A (en) | 2000-02-23 | 2000-02-23 | Illumination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001236811A true JP2001236811A (en) | 2001-08-31 |
Family
ID=18573725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000052162A Pending JP2001236811A (en) | 1999-12-28 | 2000-02-23 | Illumination device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001236811A (en) |
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| KR100437838B1 (en) * | 2001-12-29 | 2004-06-30 | 엘지.필립스 엘시디 주식회사 | A Backlight Unit |
| JP2005071971A (en) * | 2002-10-04 | 2005-03-17 | Nichia Chem Ind Ltd | Light guide plate for surface light emitting device, and surface light emitting device |
| US7001035B2 (en) | 2002-03-05 | 2006-02-21 | Seiko Epson Corporation | Illumination device, liquid crystal device, and electronic apparatus |
| JP2006351522A (en) * | 2005-05-17 | 2006-12-28 | Nec Lcd Technologies Ltd | Back light and liquid crystal display device |
| US7171104B2 (en) | 2002-10-04 | 2007-01-30 | Nichia Corporation | Optical waveguide plate for surface light emitting apparatus and surface light emitting apparatus using the optical waveguide plate |
| KR100817097B1 (en) * | 2001-08-31 | 2008-03-26 | 후지쯔 가부시끼가이샤 | Lighting apparatus and liquid crystal display |
| JP2008200294A (en) * | 2007-02-20 | 2008-09-04 | Sankyo Co Ltd | Game machine |
| JP2008293769A (en) * | 2007-05-24 | 2008-12-04 | Stanley Electric Co Ltd | Luminaire |
| JP2008307080A (en) * | 2007-06-12 | 2008-12-25 | Sankyo Co Ltd | Slot machine |
| KR100887749B1 (en) * | 2007-03-30 | 2009-03-12 | 주식회사 우영 | Poly Integrated Prism Lens and Back Light Unit therewith |
| CN100470325C (en) * | 2004-07-13 | 2009-03-18 | 夏普株式会社 | Liquid crystal display device |
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