JPS6380241A - Transmission type screen - Google Patents
Transmission type screenInfo
- Publication number
- JPS6380241A JPS6380241A JP61225014A JP22501486A JPS6380241A JP S6380241 A JPS6380241 A JP S6380241A JP 61225014 A JP61225014 A JP 61225014A JP 22501486 A JP22501486 A JP 22501486A JP S6380241 A JPS6380241 A JP S6380241A
- Authority
- JP
- Japan
- Prior art keywords
- total reflection
- layer
- refractive index
- screen
- fine particles
- 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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Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 23
- 239000010419 fine particle Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 12
- 230000031700 light absorption Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 238000010422 painting Methods 0.000 abstract 3
- 239000011248 coating agent Substances 0.000 description 23
- 238000000576 coating method Methods 0.000 description 23
- 239000002245 particle Substances 0.000 description 7
- 230000000873 masking effect Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- OMOVVBIIQSXZSZ-UHFFFAOYSA-N [6-(4-acetyloxy-5,9a-dimethyl-2,7-dioxo-4,5a,6,9-tetrahydro-3h-pyrano[3,4-b]oxepin-5-yl)-5-formyloxy-3-(furan-3-yl)-3a-methyl-7-methylidene-1a,2,3,4,5,6-hexahydroindeno[1,7a-b]oxiren-4-yl] 2-hydroxy-3-methylpentanoate Chemical compound CC12C(OC(=O)C(O)C(C)CC)C(OC=O)C(C3(C)C(CC(=O)OC4(C)COC(=O)CC43)OC(C)=O)C(=C)C32OC3CC1C=1C=COC=1 OMOVVBIIQSXZSZ-UHFFFAOYSA-N 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Abstract
Description
【発明の詳細な説明】
【産業上の利用分野１
本発明は、観察側の面に多数のレンチキュラーレンズが
形成されており、そのレンチキュラーレンズを構成する
レンズ単位の一部には観察側方向へ光を拡散させるため
の全反射面を備えた透過型スクリーンに関し、詳しくは
前記全反射面に第１層として低屈折率物質層、第２居と
して外光吸収層が形成された透過型スクリーンに関する
ものである。
［発明の背景］
透過型スクリーンはビデオプロジェクタ−や、マイクロ
フィルムリーダーあるいはコンピューター用ディスプレ
イ等の投影面として用いられているが、その視野角度を
大きくする等、その光透過特性について各種の検討がな
されている。そしてこのような目的を達成するための手
段の１つとして本出願人は特開昭５７−１８５８３０号
公報において、レンチキュラーレンズを構成するレンズ
単位の一部に光を観察側方向へ拡散させるための全反射
面を備え、かつその全反射面上に屈折率が媒体の屈折率
よりも小さい物質からなる第１層を形成し、さらにこの
上に第２層である外光吸収層を形成した背面投影スクリ
ーンを開示している。
第５図はそのようなスクリーンを示した拡大断面図であ
り、３０はレンチキュラーレンズ、３２は該レンチキュ
ラーレンズ３０の谷部に形成された全反射面、３３は低
屈折率物質からなる全反射層、３４は外光吸収層である
。このスクリーンの場合、投影側から入射した光３５は
全反射面３２で反射されるので、明るいスクリーンとな
る。
このように、特開昭５７−１ｆ１５８３０号公報で提案
された発明によれば、光の出射しない全反射面を外光吸
収層として利用でき、しかも低屈折率層が全反射面と外
光吸収層の間に形成されているので全反射面の全反射′
ｌ＆俺を妨げることがなく、良好な光透過特性を有する
背面投影スクリーンを提供できる利点がある。
［発明が解決しようとする問題点］
しかしながら、前記スクリーンを製造する場合において
、上記低屈折率層、外光吸収層をスクリーンの谷間に塗
る場合、溶剤の蒸発により塗料がやせてくる、いわゆる
「やせｊの現象が起こる問題点がある。
このｒやせ１の現象は、主に低屈折率層を形成する塗布
液の固形分量が少ないことに起因しているとみられるが
、これによって塗膜が薄くなりすぎて充分に機ｆ莞しな
かったり、はなはだしくは部分的に亀裂が生じたりする
懸念がある。理想的には第６図に示すように、レンズ単
位２０の谷部２２を形成する全反射面２１に、乾燥後の
塗膜が均一になるように形成されるのが望ましい。
この問題を解決するために単にハイソリッドタイプの塗
料を用いることは高粘度のために谷部２２への充填が困
難で、均一な塗装が得にくくなるので現実的ではない、
さらに、上記塗膜欠陥を防ぐために、塗装液を厚く何回
も塗るということは、製造コスト上において問題があり
、また、塗膜の厚さの均一性にも欠けるきらいがあるま
た、透過型スクリーンのような光を透過し、それを肉眼
で見るという光学製品は、わずかな塗装膜の不均一も透
過光の散乱光等の欠陥となるので、揮発成分の蒸発のよ
うに周囲条件の影響を受けやすい処理を塗装膜全体にわ
たって均一に行わしめる方法が望まれていた。この辺の
事情は第２層の外光吸収層においても同様であった。
［問題点を解決するための手段］
本発明の目的は、上記従来技術の問題点に鑑み、第１層
および第２層の働きを阻害せず、かつやせの現象が起こ
りにくい良好な光学特性を有する透過型スクリーンを提
供することにある。
以上のような目的は、観察側の面と入射側の面を有し、
観察側の面には多数のレンチキュラーレンズが形成され
ている透過型スクリーンであって、該レンチキュラーレ
ンズを構成するレンズ単位の一部には観察側方向へ光を
拡散させるための全反射面を有しており、しかも該全反
射面には基材の屈折率よりも低い屈折率の物質中に微粒
子が混入された第１層と、外光吸収層である第２層が形
成されていることを特徴とする透過型スクリーンにより
達成される。
［作用］
上記のような透過型スクリーンによれば、第１層中の微
粒子が前記全反射面の略全面にわたって均一に低屈折率
物質を固定することを可能にし、全反射効果を高め、光
学的に欠陥の少ない塗装膜を有する透過型スクリーンを
得ることができる。さらに、第２層にも外光吸収性を持
つ微粒子を混入させることにより、第２層の塗膜を均一
化し、外光吸収性を高めることができる。
［実施例］
以下、本発明の透過型スクリーンについて具体的な実施
例に基づき詳細に説明する。
第３図は本発明の透過型スクリーンの一実施例を示す概
略斜視図である。
同図において、ｌがアクリル樹脂、ポリカーボネート樹
脂、塩化ビニル樹脂、あるいはスチレン樹脂等の合成樹
脂からなるスクリーン基材、２が該スクリーン基材１の
観察側の面（Ｂ）に形成されたレンチキュラーレンズで
ある。（Ａ）は投影面側の面、１３は外光吸収層、４は
投影側の面（Ａ）に設けられたフレネルレンズである。
第１図は、第３図に示したスクリーンの水平方向拡大断
面図を示した図である。
同図において、レンチキュラーレンズ２を構成するレン
ズ単位の両側には直線状の全反射面５が形成され、２つ
の全反射面５が谷部６を形成している。また、２つの全
反射面５の間には３つの曲面からなる山部７が設けられ
ており、−旦全反射面５で全反射した光および山部７に
直進した光をそれぞれ拡散して出射するようになってい
る。
この第１実施例は例えば、上記のようなレンチキュラー
レンズ２の谷部６に、スクリーン基材１の屈折率よりも
低い屈折率の物質Ｂ中に微粒子９が混入された低屈折率
層ｌＯを第１層として密着形成し、さらに第２層として
屈折率の大小を問わない任意の塗装特性の優れた光吸収
物質１１を谷部６に埋め、外光吸収層１３を形成したも
のである。 ここで、前記低屈折率層１０に微粒子９を
添加するのは塗料中の固形分量を上げるためであり、微
粒子９により前述の第６図のようなほぼ理想的な塗装が
可能になる。低屈折率物質層ｌＯに用いる樹脂成分は本
出願人が特願昭５９−７１５２０号、特願昭５９−９５
８７１号で開示したよう−。
に、フッぶ系ポリマー等を使用するの一般的である。微
粒子９としては無機物、有機物（ポリマー）の両方が採
用でき、無機物では、粒径 が１−１００ＪＬ位で樹脂
成分と同じ比重を持つものが塗装上好ましく、例えば、
Ａｎ （Ｏ）Ｉ）３、ＣａＣＯ３，ＡＪＬ２０３．雲母
、ＳｉＯ２、Ｔｉ ０２ 、Ｂａ５Ｏ４，ガラスピーズ
などの一般的な充填剤、顔料を使用することができる。
有機ポリマーとしてはポリエチレンなどがある。
また、微粒子９を添加した低屈折率物質層ｌＯを全反射
面５に塗布するときに微粒子９の比重、大きさ等を塗布
液の粘性に応じて調整することにより、全反射面５に微
粒子９が直接接触しないようにすることも可能である。
第２［１４は本発明に係るスクリーンの第２実施例の水
平方向拡大断面図を示した図である。
この実施例の場合は第１図の低屈折率層１０と同様に外
光吸収層１３にも微粒子１２を添加したもので、添加す
る微粒子の色は特に問わないが、黒色顔料や黒く染色し
た微粒子のほうが光吸収性を低下させないので好ましい
、黒色染料には一般にカーボンブラックなどが顔料とし
て用いられているが、黒く着色したガラスピーズや黒く
表面染色したポリマー系ビーズを用いると、粒径の大き
いものが得やすく固形分量の増大が顕著となり、また塗
布液の凝集を防ぐことができ便利である。
次に本発明の透過型スクリーンのさらに具体的な実施例
のいくつかを説明する。
（実施例１）：低屈折率層への微粒子添加の効果■スク
リーン基材の作成
まず、第４図に示すようなレンズ単位よりなるレンチキ
ュラーレンズ金型を作製し、焦点距離１ｍ、 ピッチ
０．５ｍｍのフレネルレンズ金型と組合せて、平均粒径
４ＪＬの５ｉ０２．１．７％を含んだ板厚３ｍｍのメタ
クリル樹脂基板（サイズ３００Ｘ３００ｍｍ）を１８０
℃、３０分加熱、４０ｋｇ／ｃｒｎ’で加圧成型して、
はぼ第１図に示すようなスクリーン（基材のみ）を得る
。
■マスキング
そして、該スクリーン基材にポバール水溶液を前記レン
チキュラーレンズの頂上部にスクリーン印刷またはロー
ルコートによりＰ！！布し、マスキングを行う。
■光反射層（低屈折率１ｆ！りの形成
フッ化ヒニリデン／４フッ化エチレン（８０：２０）共
重合２０％、メチルイソブチルケトン（ＭＩＢＫ）８０
％の溶液に下記の例１〜例３の顔料をそれぞれ添加し、
十分攪拌して本発明に係る微粒子を含んだ３種類の低屈
折率溶液を得た後、該溶液をそれぞれレンチキュラーの
谷部に塗布し光反射層を形成した。
例１：平均粒径４ＩＬの酸化ケイ素１０部例２：平均粒
径３．５鉢の水酸化アルミニウム８部
例３：平均粒径３０μのポリオレフィンパウダー１０部
対比例：顔料の添加なし
なお、塗装液を乾燥させた後の反射層の様子は例１〜例
３はいずれも第６図に示したほぼ理想的な塗装膜になっ
ているのに対し、対比例のスクリーンはｒやせ１が激し
かった。
■外光吸収層の形成
武蔵塗料ＫＫ製ｒプラエース７１６ＡＭＪを前記光反射
層の上に塗布し、外光吸収層を形成した。
■各スクリーンの比較
マスキングを除去して外観を観察した。低屈折率層への
微粒子添加した例１〜例３のスクリーンは対比例に比べ
外観が均一・になった、断面を観察したところ、対比例
では低屈折率層の厚さが不均一であるのに対し、例１〜
例３のスクリーンの場合は低屈折率層の厚さは均一にな
っていた。
（実施例２）：外光吸収層への微粒子添加の効果■スク
リーン基材の作成：実施例１と同じ。
■マスキング：実施例１と同じ。
■光反射層（低屈折率層）の形成：実施例１において微
粒子は例２で形成した。
■外光吸収層の形成
武蔵塗料ＫＫ製「プラエース７１６ＡＭＪに平均粒径３
０ＩＬのポリエチレンパウダーを硫化銅により表面染色
したものを、染料に対し、１０部添加し、前記反射層の
上に塗布し、外光吸収層を形成した。
■スクリーンの観察
マスキングを除去して外観を観察すると、きめが細かく
、かつ黒味の強い塗装を持つスクリーンが得られた。
【発明の効果】
以上、説明した様に本発明の透過型スクリーンによれば
、第１層中の微粒子が前記全反射面の略全面にわたって
均一に低屈折率物質を固定することを可能にし、ｒやせ
」を防止することができる。また、低屈折率物質の層が
確実に形成されているため、全反射効果を高め、光学的
に欠陥の少ない塗装膜を有する透過型スクリーンを得る
ことができる。さらに、第２層にも外光吸収性を持つ微
粒子を混入させることにより、第２層の塗膜を均一化し
、外光吸収性を高めることもできる。Detailed Description of the Invention [Industrial Application Field 1] The present invention is characterized in that a large number of lenticular lenses are formed on the viewing side surface, and some of the lens units constituting the lenticular lenses have a lens that extends toward the viewing side. The present invention relates to a transmission screen having a total reflection surface for diffusing light, and more particularly to a transmission screen in which a low refractive index material layer is formed as a first layer and an external light absorption layer is formed as a second layer on the total reflection surface. It is something. [Background of the Invention] Transmissive screens are used as projection surfaces for video projectors, microfilm readers, computer displays, etc., but various studies have been conducted on their light transmission characteristics, such as increasing their viewing angle. ing. As one of the means for achieving such an objective, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 57-185830 that a part of the lens unit constituting the lenticular lens has a structure for diffusing light toward the observation side. A back surface comprising a total reflection surface, on which a first layer made of a substance whose refractive index is smaller than the refractive index of the medium, and further formed with a second layer, an external light absorption layer, on the total reflection surface. A projection screen is disclosed. FIG. 5 is an enlarged sectional view showing such a screen, where 30 is a lenticular lens, 32 is a total reflection surface formed in the valley of the lenticular lens 30, and 33 is a total reflection layer made of a low refractive index material. , 34 are external light absorbing layers. In the case of this screen, the light 35 incident from the projection side is reflected by the total reflection surface 32, resulting in a bright screen. In this way, according to the invention proposed in JP-A-57-1F15830, a total reflection surface from which no light is emitted can be used as an external light absorption layer, and a low refractive index layer can be used as a total reflection surface and an external light absorption layer. Since it is formed between layers, the total reflection of the total reflection surface
It has the advantage of providing a rear projection screen with good light transmission properties without disturbing the light. [Problems to be Solved by the Invention] However, when manufacturing the screen, when applying the low refractive index layer and external light absorbing layer to the valleys of the screen, the paint thins due to evaporation of the solvent, so-called " There is a problem in which the phenomenon of thinning 1 occurs. This phenomenon of thinning 1 is thought to be mainly due to the small amount of solid content in the coating liquid that forms the low refractive index layer. There is a concern that it may become too thin and not be sufficiently flexible, or cracks may occur excessively or partially.Ideally, as shown in FIG. It is desirable to form a uniform coating film on the reflective surface 21 after drying.To solve this problem, simply using a high solid type coating will cause the coating to reach the valleys 22 due to its high viscosity. It is difficult to fill and it is difficult to obtain a uniform coating, so it is not practical.
Furthermore, in order to prevent the above-mentioned coating film defects, applying a thick coating solution many times is problematic in terms of manufacturing costs, and the coating film tends to lack uniformity in thickness. For optical products such as screens that transmit light and view it with the naked eye, slight unevenness in the coating film can cause defects such as scattered light in the transmitted light. There was a need for a method that would allow sensitive treatments to be carried out uniformly over the entire coating film. This situation was also the same for the second external light absorbing layer. [Means for Solving the Problems] In view of the above-mentioned problems of the prior art, an object of the present invention is to provide good optical properties that do not inhibit the functions of the first layer and the second layer and are less prone to thinning phenomenon. An object of the present invention is to provide a transmission screen having the following features. The above purpose has an observation side surface and an incident side surface,
It is a transmission type screen in which a large number of lenticular lenses are formed on the observation side surface, and some of the lens units constituting the lenticular lenses have a total reflection surface for diffusing light toward the observation side. Moreover, the total reflection surface is formed with a first layer in which fine particles are mixed in a substance with a refractive index lower than that of the base material, and a second layer which is an external light absorption layer. This is achieved by a transmissive screen featuring: [Function] According to the above-mentioned transmission screen, the fine particles in the first layer enable the low refractive index material to be fixed uniformly over substantially the entire surface of the total reflection surface, increasing the total reflection effect and improving optical performance. A transmission screen having a coating film with fewer defects can be obtained. Furthermore, by incorporating fine particles having external light absorbing properties into the second layer, the coating film of the second layer can be made uniform and the external light absorbing properties can be increased. [Examples] Hereinafter, the transmission screen of the present invention will be described in detail based on specific examples. FIG. 3 is a schematic perspective view showing an embodiment of the transmission screen of the present invention. In the figure, l is a screen base material made of synthetic resin such as acrylic resin, polycarbonate resin, vinyl chloride resin, or styrene resin, and 2 is a lenticular lens formed on the observation side surface (B) of the screen base material 1. It is. (A) is a surface on the projection side, 13 is an external light absorption layer, and 4 is a Fresnel lens provided on the projection side surface (A). FIG. 1 is an enlarged horizontal cross-sectional view of the screen shown in FIG. 3. In the figure, linear total reflection surfaces 5 are formed on both sides of the lens unit constituting the lenticular lens 2, and the two total reflection surfaces 5 form a valley 6. Furthermore, a crest 7 consisting of three curved surfaces is provided between the two total reflection surfaces 5, and diffuses the light that has been totally reflected by the total reflection surface 5 and the light that has gone straight to the ridge 7, respectively. It is designed to emit light. In this first embodiment, for example, a low refractive index layer 10 in which fine particles 9 are mixed in a substance B having a refractive index lower than that of the screen base material 1 is provided in the valley portion 6 of the lenticular lens 2 as described above. The external light absorbing layer 13 is formed by closely forming the first layer, and further by filling the valleys 6 with any light absorbing material 11 having excellent coating properties regardless of the magnitude of the refractive index as the second layer. Here, the reason why the fine particles 9 are added to the low refractive index layer 10 is to increase the solid content in the paint, and the fine particles 9 enable almost ideal coating as shown in FIG. 6 described above. The resin component used for the low refractive index material layer IO is disclosed in Japanese Patent Application No. 59-71520 and Japanese Patent Application No. 59-95.
As disclosed in No. 871. It is common to use fluorine-based polymers. Both inorganic substances and organic substances (polymers) can be used as the fine particles 9. Among inorganic substances, those having a particle size of about 1 to 100 JL and having the same specific gravity as the resin component are preferable for coating purposes.
An(O)I)3, CaCO3, AJL203. Common fillers and pigments such as mica, SiO2, Ti02, Ba5O4, and glass beads can be used. Examples of organic polymers include polyethylene. In addition, when applying the low refractive index material layer 10 added with fine particles 9 to the total reflection surface 5, by adjusting the specific gravity, size, etc. of the fine particles 9 according to the viscosity of the coating liquid, the fine particles can be coated on the total reflection surface 5. It is also possible to prevent 9 from coming into direct contact. 2nd [14] is a diagram showing an enlarged horizontal cross-sectional view of a second embodiment of the screen according to the present invention. In this example, fine particles 12 are added to the external light absorbing layer 13 in the same way as the low refractive index layer 10 in FIG. Fine particles are preferable because they do not reduce light absorption.Carbon black is generally used as a pigment for black dyes, but if black colored glass beads or black surface-dyed polymer beads are used, they have a large particle size. It is convenient because it is easy to obtain a product, the solid content increases significantly, and aggregation of the coating solution can be prevented. Next, some more specific embodiments of the transmission screen of the present invention will be described. (Example 1): Effect of adding fine particles to low refractive index layer ■ Creation of screen base material First, a lenticular lens mold consisting of lens units as shown in Fig. 4 was prepared, and the focal length was 1 m and the pitch was 0. In combination with a 5 mm Fresnel lens mold, a methacrylic resin substrate (size 300 x 300 mm) with a thickness of 3 mm containing 5i02.1.7% with an average particle size of 4 JL was
℃, heated for 30 minutes, pressure molded at 40 kg/crn',
A screen (base material only) as shown in FIG. 1 is obtained. ■Masking Then, apply POVAL aqueous solution to the top of the lenticular lens by screen printing or roll coating on the screen base material! ! cloth and perform masking. ■Light reflective layer (formation of low refractive index 1f!) Hynylidene fluoride/tetrafluoroethylene (80:20) copolymerization 20%, methyl isobutyl ketone (MIBK) 80%
% solution of the pigments of Examples 1 to 3 below, respectively,
After stirring sufficiently to obtain three types of low refractive index solutions containing fine particles according to the present invention, the solutions were applied to the valleys of the lenticules to form light reflecting layers. Example 1: 10 parts of silicon oxide with an average particle size of 4IL Example 2: 8 parts of aluminum hydroxide with an average particle size of 3.5 μl Example 3: 10 parts of polyolefin powder with an average particle size of 30μ Comparative example: No pigment added, coating The appearance of the reflective layer after drying the liquid is that Examples 1 to 3 all have almost ideal coating films as shown in Figure 6, whereas the screen of the comparative example has severe thinning. Ta. (2) Formation of an external light absorbing layer R-PLACE 716AMJ manufactured by Musashi Paints KK was coated on the light reflecting layer to form an external light absorbing layer. ■Comparison of each screen The masking was removed and the appearance was observed. The screens of Examples 1 to 3, in which fine particles were added to the low refractive index layer, had a more uniform appearance compared to the comparative example. When the cross section was observed, the thickness of the low refractive index layer was uneven in the comparative example. In contrast, example 1~
In the case of the screen of Example 3, the thickness of the low refractive index layer was uniform. (Example 2): Effect of adding fine particles to the external light absorption layer ■Preparation of screen base material: Same as Example 1. ■Masking: Same as Example 1. (2) Formation of light-reflecting layer (low refractive index layer): In Example 1, the fine particles were formed in Example 2. ■Formation of external light absorption layer Musashi Paints KK's "Plaace 716AMJ" has an average particle size of 3.
0IL polyethylene powder surface-dyed with copper sulfide was added to the dye in an amount of 10 parts, and was applied onto the reflective layer to form an external light absorbing layer. ■ Observation of the screen When the masking was removed and the appearance was observed, a screen with fine texture and a strong black coating was obtained. Effects of the Invention As described above, according to the transmission screen of the present invention, the fine particles in the first layer enable the low refractive index substance to be fixed uniformly over substantially the entire surface of the total reflection surface, It is possible to prevent ``lack of weight''. Furthermore, since the layer of the low refractive index material is reliably formed, it is possible to enhance the total reflection effect and obtain a transmission screen having a coating film with few optical defects. Furthermore, by incorporating fine particles having external light absorbing properties into the second layer as well, the coating film of the second layer can be made uniform and the external light absorbing properties can be increased.
第１図は本発明の透過型スクリーンの第１実施例を示す
概略断面図、第２図は本発明の透過型スクリーンの第２
実施例を示す概略断面図、第３図は本発明の透過型スク
リーンの概略斜視図である。
第４図はスクリーンの金型を示す図、第５図は本出願人
が提案したスクリーンを示す概略断面図、第６図は理想
的な低屈折率膜の形成状態を示す図である。
２：レンチキュラーレンズ
７：山部
６：谷部
５：全反射面
８：低屈折率物質
９：微粒子
ｌＯ：低屈折率層
１１：光吸収物質
１２：微粒子
１３：外光吸収層
第１図
第２図FIG. 1 is a schematic sectional view showing a first embodiment of the transmission screen of the present invention, and FIG. 2 is a schematic sectional view showing a second embodiment of the transmission screen of the invention.
A schematic sectional view showing an embodiment, and FIG. 3 is a schematic perspective view of a transmission screen of the present invention. FIG. 4 is a diagram showing a mold for the screen, FIG. 5 is a schematic sectional view showing a screen proposed by the applicant, and FIG. 6 is a diagram showing an ideal state of forming a low refractive index film. 2: Lenticular lens 7: Peaks 6: Valleys 5: Total reflection surface 8: Low refractive index substance 9: Fine particles 1O: Low refractive index layer 11: Light absorbing substance 12: Fine particles 13: External light absorbing layer FIG. Figure 2
Claims (2)
多数のレンチキュラーレンズが形成されている透過型ス
クリーンであって、 該レンチキュラーレンズを構成するレンズ単位の一部に
は観察側方向へ光を拡散させるための全反射面を有して
おり、しかも該全反射面には基材の屈折率よりも低い屈
折率の物質中に微粒子が混入された第１層と、外光吸収
層である第２層が形成されていることを特徴とする透過
型スクリーン。(1) A transmission screen that has an observation side surface and an incident side surface, and has a large number of lenticular lenses formed on the observation side surface, and a part of the lens unit constituting the lenticular lens. has a total reflection surface for diffusing light toward the observation side, and the total reflection surface includes a first layer in which fine particles are mixed in a substance with a refractive index lower than that of the base material. A transmission screen characterized in that a second layer which is an external light absorption layer is formed.
層であることを特徴とする特許請求の範囲第１項記載の
透過型スクリーン。(2) The transmission screen according to claim 1, wherein the second layer is an external light absorbing layer containing fine particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61225014A JPS6380241A (en) | 1986-09-25 | 1986-09-25 | Transmission type screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61225014A JPS6380241A (en) | 1986-09-25 | 1986-09-25 | Transmission type screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6380241A true JPS6380241A (en) | 1988-04-11 |
| JPH0455490B2 JPH0455490B2 (en) | 1992-09-03 |
Family
ID=16822718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61225014A Granted JPS6380241A (en) | 1986-09-25 | 1986-09-25 | Transmission type screen |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6380241A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03220542A (en) * | 1990-01-26 | 1991-09-27 | Victor Co Of Japan Ltd | Transmission type screen |
| EP0819975A1 (en) * | 1991-11-15 | 1998-01-21 | Matsushita Electric Industrial Co., Ltd. | Transmission type screen and method of manufacturing thereof |
| WO2001004701A1 (en) * | 1999-07-07 | 2001-01-18 | 3M Innovative Properties Company | Rear projection screen using internal reflection and its production |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58163930A (en) * | 1982-03-24 | 1983-09-28 | Mitsubishi Rayon Co Ltd | Manufacture of back projection screen |
| JPS60159734A (en) * | 1983-12-30 | 1985-08-21 | エヌ・ベー・フイリツプス・フルーイランペンフアブリケン | Light transmitting plate |
-
1986
- 1986-09-25 JP JP61225014A patent/JPS6380241A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58163930A (en) * | 1982-03-24 | 1983-09-28 | Mitsubishi Rayon Co Ltd | Manufacture of back projection screen |
| JPS60159734A (en) * | 1983-12-30 | 1985-08-21 | エヌ・ベー・フイリツプス・フルーイランペンフアブリケン | Light transmitting plate |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03220542A (en) * | 1990-01-26 | 1991-09-27 | Victor Co Of Japan Ltd | Transmission type screen |
| EP0819975A1 (en) * | 1991-11-15 | 1998-01-21 | Matsushita Electric Industrial Co., Ltd. | Transmission type screen and method of manufacturing thereof |
| EP0819974A1 (en) * | 1991-11-15 | 1998-01-21 | Matsushita Electric Industrial Co., Ltd. | Transmission type screen and method of manufacturing thereof |
| WO2001004701A1 (en) * | 1999-07-07 | 2001-01-18 | 3M Innovative Properties Company | Rear projection screen using internal reflection and its production |
| US6417966B1 (en) | 1999-07-07 | 2002-07-09 | 3M Innovative Properties Company | Rear projection screen using internal reflection |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0455490B2 (en) | 1992-09-03 |
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