JP2000249836A - 面光源素子およびその製造方法 - Google Patents
面光源素子およびその製造方法Info
- Publication number
- JP2000249836A JP2000249836A JP11048106A JP4810699A JP2000249836A JP 2000249836 A JP2000249836 A JP 2000249836A JP 11048106 A JP11048106 A JP 11048106A JP 4810699 A JP4810699 A JP 4810699A JP 2000249836 A JP2000249836 A JP 2000249836A
- Authority
- JP
- Japan
- Prior art keywords
- light
- emission
- light guide
- light source
- projections
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
- B29C65/1406—Ultraviolet [UV] radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1448—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface radiating the edges of the parts to be joined, e.g. for curing a layer of adhesive placed between two flat parts to be joined, e.g. for making CDs or DVDs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1464—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators
- B29C65/1467—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1477—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier
- B29C65/1483—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier coated on the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1487—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of light guides
- B29C65/149—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of light guides being a part of the joined article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
- B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
- B29C65/4845—Radiation curing adhesives, e.g. UV light curing adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
- B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
- B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
- B29C66/91645—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile by steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
- B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
れた出射光制御シートが導光板の出射面上に配置される
面光源素子において、出射光制御シートの微小な凸部を
接着層に埋没させることなく先端のみが接着された面光
源素子およびその製造方法を提供すること。 【解決手段】 光源2と、リフレクタ9と、リフレクタ
9で反射された光源からの光が端面1から入射される導
光体3と、導光体3の出射面に対向する面に複数の凸部
7を有し、導光体3の出射面6側に設けられて導光体3
の出射面6からの光を正面方向に向かわせる出射光制御
シート4とを備え、該出射光制御シート4の凸部7の先
端部と導光体の出射面6とが紫外線硬化樹脂8により接
着されている。この面光源素子は、出射光制御シート4
の凸部7の先端部と導光体3の出射面6との接着に用い
る紫外線硬化樹脂8にあらかじめ微弱な紫外線を当てて
半硬化状態にした後、該出射光制御シート4と導光体3
の出射面6とを重ね合わせ、次いで、該紫外線硬化樹脂
8に強力な紫外線を当てることにより紫外線硬化樹脂8
を完全硬化させることによって製造することができる。
Description
ュータ、コンピュータ用モニタ、ビデオカメラ、テレビ
受信機、カーナビゲーションシステムなどの直視型液晶
表示装置に用いられる面光源素子およびその製造方法に
関する。
は、面状に光を発する面光源素子(バックライト)とド
ット状に画素が配置された表示パネルとで構成され、該
表示パネルの各画素の光の透過率がコントロールされる
ことによって文字および映像が表示される。面光源素子
としては、ハロゲンランプ、反射板、レンズ等が組み合
わされて出射光の輝度の分布が制御されるもの、蛍光管
が導光体の端面に設けられ、蛍光管からの光が端面と垂
直な面から出射されるもの、蛍光管が導光体の内部に設
けられたもの(直下型)などが挙げられる。ハロゲンラ
ンプを利用した面光源素子は、高輝度を必要とする液晶
プロジェクタに主に用いられる。一方、導光体を利用し
た面光源素子は薄型化が可能であるため、直視型の液晶
TV、パーソナルコンピュータのディスプレイなどに用
いられることが多い。
る面光源素子では、消費電力を軽減すること、および高
輝度であることが要求されている。高輝度化を実現する
ことは、冷陰極管などの光源を増やすことで可能である
が、この方法は消費電力の増加につながるため実用的で
はない。そこで、導光板上に光を取り出すシート(出射
光制御シート)が設けられた構成の面光源素子が提案さ
れている(特開平8−221013号公報等を参照)。
この面光源素子によれば、光の全反射を利用しており、
光の損失が少なく、高輝度化を実現することができる。
面光源素子では、導光板と出射光制御シートの凸部先端
とを光線が通過可能なように接着しなければならない。
このときの接着方法としては、透明な粘着剤、熱硬化樹
脂などを用いて接着することが挙げられるが、薄い接着
層を設けようとしても均一に塗布することが困難であ
り、接着層に厚い部分ができると、出射光制御シートの
微小な凸部が接着層に埋まってしまうという課題が生じ
ていた。この面光源素子においては、当該微小な凸部が
周囲を空気で囲まれていることによって凸部壁面で全反
射が生じ、これにより該凸部が集光レンズの役割を果た
すのであり、該凸部の大部分が接着剤に埋まってしまう
と集光レンズの役割を果たさなくなる。
のであり、全反射を利用して光を集光する凸部が設けら
れた出射光制御シートが導光板の出射面上に配置される
面光源素子において、出射光制御シートの微小な凸部を
接着層に埋没させることなく先端のみが接着された面光
源素子およびその製造方法を提供することを目的とす
る。
発明の面光源素子は、光源と、リフレクタと、リフレク
タで反射された光源からの光が端面から入射される導光
体と、導光体の出射面に対向する面に複数の凸部を有
し、導光体の出射面側に設けられて、導光体の出射面か
らの光を正面方向に向かわせる出射光制御シートとを備
え、該出射光制御シートの凸部の先端部と導光体の出射
面とが紫外線硬化樹脂により接着されていることを特徴
とする。この面光源素子は、出射光制御シートの凸部の
先端部と導光体の出射面との接着に用いる紫外線硬化樹
脂にあらかじめ微弱な紫外線を当てて半硬化状態にした
後、該出射光制御シートと導光体の出射面とを重ね合わ
せ、次いで、該紫外線硬化樹脂に強力な紫外線を当てる
ことにより紫外線硬化樹脂を完全硬化させることによっ
て、該出射光制御シートの凸部の先端部と導光体の出射
面とを接着することにより製造することができる。
の概略構成図を示す。この面光源素子は両端面1に光源
2が設けられた導光体3と、導光体3から出射された光
の角度分布を制御する出射光制御シート4とを備えてい
る。出射光制御シート4は導光体3上に配置されてお
り、入射面5に入射した光が出射面6から出射される。
出射光制御シート4の入射面5には多数の凸部7が形成
されており、この凸部7の導光体側先端と導光体3の光
出射面とが紫外線硬化樹脂からなる接着剤8を用いて光
線が通過するように光学的に点接着されている。光源2
の周りには、導光体3の端面とは反対方向に進む光を反
射し、導光体3の端面方向に進行させるリフレクタ9が
設けられている。端面1から導光体に入射した光は導光
体内を全反射を繰り返しながら伝搬していく。この伝搬
光は凸部7と導光体3の出射面との密着部から出射光制
御シート4に取り込まれる。これにより、導光体3内を
伝搬する光は当該密着部から順次、出射光制御シート4
に取り出され、取り出された光は出射光制御シート4の
凸部7内で全反射されながら集光される。
の凸部の先端のみを接着するために紫外線硬化樹脂を用
いる。この面光源素子は、例えば、以下の方法により製
造することができる。まず、PETフィルム(例えば、
厚さが125μm)の片側にバーコーターで紫外線硬化
樹脂を約10μmの厚さになるように塗布し、紫外線硬
化樹脂面とアクリル樹脂製等の導光板とをラミネーター
で貼り合わせる。次いで、高圧水銀ランプから発生され
る微弱な紫外線をPETフィルム側から照射し(例えば
120mJ)、半硬化状態の紫外線硬化樹脂層を得る。
これにより、凸部が紫外線硬化樹脂層に埋没することを
防ぎ、該凸部の先端のみを点接着させることができる。
そして、PETフィルムを剥離して導光板の上に接着剤
が塗布された状態を得る。その上から出射光制御シート
を押しつけ(例えば、圧力0.3kgf/cm2)、ラ
ミネーターを用いて貼り付ける。最後に出射光制御シー
ト側から高圧水銀ランプから発せられる紫外線を照射し
(例えば2.0J)、紫外線硬化樹脂を完全に硬化す
る。
脂内に埋め込まれた部分の面積は、導光板側から光学顕
微鏡を用いて観察することにより測定することができ
る。埋め込まれた部分は光が反射してこないために暗い
部分として観察され、凸部が埋め込まれていない接着剤
表面は明るい部分として観察される(図2において
(a)は紫外線硬化樹脂が適度に半硬化されており、凸
部が点で接着されている状態を、(b)は紫外線硬化樹
脂の硬化が不十分で、凸部が過度に埋没している状態を
示す。)。出射光制御シートの凸部が紫外線硬化樹脂に
埋没すれば暗い部分の面積が大きくなるので、暗い部分
の直径(以下、これを「接着直径」と表現する。)を測
定することによって接着の状態を判断することができ
る。
の微弱な紫外線の照射量と接着直径との関係の一例を図
3に示す。紫外線の照射量が少ないと、接着直径は大き
くなり、出射光制御シートの凸部が紫外線硬化樹脂に埋
没していることが分かる。照射量が徐々に大きくなるに
つれて接着直径が小さくなり、凸部の埋没量が出射光制
御シートからの出射光特性が良好な範囲になるように制
御することができることが分かる(出射光制御シートの
一例では接着直径が15〜18μmの範囲であれば良
い。)。なお、照射量が大きくなりすぎると接着力が低
下するので、凸部が埋没しない範囲でなるべく少ない照
射量を選択することが好ましい。照射量は、接着剤に含
まれる重合開始剤濃度などで変化するため、接着剤に適
した照射量を選ぶ必要がある。
法、紫外線硬化による2P法、熱硬化による2P法、雌
金型を用いた射出成形法等によって形成することができ
る。出射光制御シートの作製に用いるスタンパは、例え
ばガラス基板上にネガ型あるいはポジ型の紫外線硬化樹
脂をコーティングし、この紫外線硬化樹脂をフォトマス
クを介して露光し、現像後、電鋳を行うことにより作製
することができる。出射光制御シートはシート状である
必要はなく、板状であってもよい。シート状および板状
の何れでも量産性に富むため、安価で大量に製造するこ
とが可能である。本発明では、導光体として、例えば厚
さが2〜20mm程度で、光源が配置された導光体端面
間の距離が、例えば50〜500mmの範囲にあるアク
リル板を用いることができる(導光体のサイズの一例
は、幅が340mm、長さ(光源間距離)が280m
m、厚さが8mmである。)。導光体の成形に用いる樹
脂としては、アクリル樹脂の外にポリカーボネート樹
脂、ポリスチレン樹脂等の透明性に優れるものが挙げら
れる。
イトとして用い、その出射面に設けられる透過型の表示
素子としては、 STN、TFT、MINIなどの液晶
パネルが挙げられる。
集光する凸部が設けられた出射光制御シートが導光板の
出射面上に配置される面光源素子において、出射光制御
シートの微小な凸部を接着層に埋没させることなく先端
のみが接着された面光源素子およびその製造方法を提供
することができる。
の像を示す図である。
す図である。
Claims (2)
- 【請求項1】 光源と、リフレクタと、リフレクタで反
射された光源からの光が端面から入射される導光体と、
導光体の出射面に対向する面に複数の凸部を有し、導光
体の出射面側に設けられて導光体の出射面からの光を正
面方向に向かわせる出射光制御シートとを備え、該出射
光制御シートの凸部の先端部と導光体の出射面とが紫外
線硬化樹脂により接着されていることを特徴とする面光
源素子。 - 【請求項2】 出射光制御シートの凸部の先端部と導光
体の出射面との接着に用いる紫外線硬化樹脂にあらかじ
め微弱な紫外線を当てて半硬化状態にした後、該出射光
制御シートと導光体の出射面とを重ね合わせ、次いで、
該紫外線硬化樹脂に強力な紫外線を当てることにより紫
外線硬化樹脂を完全硬化させることによって、該出射光
制御シートの凸部の先端部と導光体の出射面とを接着す
る請求項1記載の面光源素子の製造方法。
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