JP2005228584A - バックライト - Google Patents
バックライト Download PDFInfo
- Publication number
- JP2005228584A JP2005228584A JP2004035837A JP2004035837A JP2005228584A JP 2005228584 A JP2005228584 A JP 2005228584A JP 2004035837 A JP2004035837 A JP 2004035837A JP 2004035837 A JP2004035837 A JP 2004035837A JP 2005228584 A JP2005228584 A JP 2005228584A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- prism
- backlight
- 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.)
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Classifications
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D1/00—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor
- A45D1/02—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with means for internal heating, e.g. by liquid fuel
- A45D1/04—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with means for internal heating, e.g. by liquid fuel by electricity
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D1/00—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor
- A45D1/06—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with two or more jaws
- A45D1/08—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with two or more jaws the jaws remaining parallel to each other during use, e.g. the jaws sliding parallel to each other
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D1/00—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor
- A45D2001/002—Accessories therefor
Abstract
【課題】 発光源と導光板と、導光板に対向するプリズムシートを有するバックライトにおいて、プリズムシートから出射する照明光の指向性が方向により異なるため、バックライトの照明が均質とならず、照明の品位が低下するのを改善する。
【解決手段】 導光板1と、その導光板の1つの側面である入光面1cに対向して配された発光源2と、前記導光板の上面1aに対向する位置に配されたプリズムシート3と、導光板の下面1bに対向する反射シート4とを有し、前記発光源2から前記入光面1cを経て前記導光板1に入光した光線を導光板1により光路変換してその上面1aより、前記プリズムシート3に入射し、そのプリズムシートにより光線の方向を整えて被照明体に照明光を出射するバックライト10おいて、前記プリズムシート3は最終出射面3aにレンチキュラーレンズ3Lを設けた構成とする。
【選択図】 図1
Description
ここで、傾斜角αは導光板101内部の光の伝播性を良くするために、小さな角度に設定される場合が多い。この場合、上面101aに対する入射角は臨界角以下となる場合でも、入射角は臨界角に近い角度になる。よって、前記の出射角φは大きな角度(例えば60°を超えるような角度)となりやすい。
Y方向の成分が少なく、垂直方向の成分が少ないので、このままでは被照明体であるLCDパネル等に対し、照明に有効な垂直方向の照明光の成分を十分に供給することができず、バックライトとして必要な照明の明るさを得ることが困難となる。そこで、導光板101からの出射光をY方向に向けるためにプリズムシート103が配されている。
θ1=sin−1[(sinθ)/1.55]・・・・(1)
と、入射角θよりもかなり小さな角度θ1で導光板1内に出射し、αの傾斜角を有するプリズムp1の面に、入射角 φ1p=90°―θ1―α の角度で入射する。ここで入射角φ1pが臨界角以上であれば、光線は全反射されて導光板の上面1aに入射角
φ1a=90°―θ1―2α で入射する。ここで、入射角φ1aが臨界角以上であれば、光線sは下面のプリズム1pに向け、更に反射され、下面のプリズム1pに対し入射角
φ2p=90°―θ1―3α で入射する。このようにして、導光板の下面のプリズム1pにおいて1回反射を受けるごとに上面1aへの入射角は2αずつ減少する。すなわち、プリズム1pで、n回反射を受けた場合の上面1aに対する入射角をφnaとすれば、
φna=90°―β―2nα・・・・(2)
と表すことができる。すなわち、反射を繰り返すたびに入射角が減少し、臨界角以下となることができる。そしてこのとき上面1aを透過して図2に例示するφの出射角で外部に出射する。
φ1a=60°―12°=48° となり、臨界角以上となり、反射されるが、プリズム1pにおいて2回反射を受けた場合は、上面1aに対する入射角は
φ2a=60°―24°=36° となり、臨界角40°以下となるので、入射光は屈折により、図2に示すように出射角φで上面1aを透過して出射する。この場合入射角であるφ2aは臨界角に近いので、図2に示す出射光S2の出射角φは大となり、例えば60°以上となる。よって、導光板1からの出射光S2の指向性は、従来と同様に、図10に示すようにY成分が少なくZ成分に偏ったものとなる。
以上に述べた、導光板1および反射シート4の作用原理そのものは、すでに、図8、図9に示して説明した従来のバックライト110の場合と同様であり、公知のものであるが、本実施例1を説明するための順序として述べたものである。
1a、3a、13a 上面
1b、3b、13b 下面
1c 入光面
1p、3p、13p プリズム
2 LED
3、13 プリズムシート
3L、13L レンチキュラーレンズ
4 反射シート
S 光束
S2 出射光
s 光線
S3、S4 照明光束
Claims (5)
- 導光板と、その導光板の1つの側面である入光面に対向して配された発光源と、前記導光板の上面に対向する位置に配されたプリズムシートと、前記導光板の下面に対向する位置に配された反射シートとを有し、前記発光源から前記入光面を経て前記導光板に入光した光線を導光板により光路変換してその上面より、前記プリズムシートに入射し、そのプリズムシートにより光線の方向を整えて被照明体に照明光を出射するバックライトにおいて、前記プリズムシートは最終出射面にレンチキュラーレンズを設けたことを特徴とするバックライト。
- 前記プリズムシートは導光板と対向する面にプリズムを設け、その反対側の最終出射面にレンチキュラーレンズを設けてなり、前記プリズムの稜線と前記レンチキュラーレンズの稜線は互いに略平行であることを特徴とする請求項1に記載のバックライト。
- 前記プリズムシートのプリズムの稜線の方向およびレンチキュラーレンズの稜線の方向は前記導光板の入光面の方向と略平行であることを特徴とする請求項2に記載のバックライト。
- 導光板の下面には稜線が入光面に略平行なプリズムが設けられていることを特徴とする請求項1乃至請求項3のいずれかに記載のバックライト。
- バックライトに使用されるプリズムシートにおいて、一方の面にプリズムが設けられ、これと対向する他方の面にレンチキュラーレンズが設けられていることを特徴とするプリズムシート。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004035837A JP4262113B2 (ja) | 2004-02-13 | 2004-02-13 | バックライト |
CN2005100082619A CN100406995C (zh) | 2004-02-13 | 2005-02-07 | 背光灯 |
KR1020050011154A KR100801227B1 (ko) | 2004-02-13 | 2005-02-07 | 백라이트 |
US11/055,018 US7046907B2 (en) | 2004-02-13 | 2005-02-11 | Backlight system |
DE102005006586.4A DE102005006586B4 (de) | 2004-02-13 | 2005-02-14 | Hintergrundbeleuchtungssystem |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004035837A JP4262113B2 (ja) | 2004-02-13 | 2004-02-13 | バックライト |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005228584A true JP2005228584A (ja) | 2005-08-25 |
JP4262113B2 JP4262113B2 (ja) | 2009-05-13 |
Family
ID=34879222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004035837A Expired - Fee Related JP4262113B2 (ja) | 2004-02-13 | 2004-02-13 | バックライト |
Country Status (5)
Country | Link |
---|---|
US (1) | US7046907B2 (ja) |
JP (1) | JP4262113B2 (ja) |
KR (1) | KR100801227B1 (ja) |
CN (1) | CN100406995C (ja) |
DE (1) | DE102005006586B4 (ja) |
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