JPH02132402A - Production of lens sheet - Google Patents
Production of lens sheetInfo
- Publication number
- JPH02132402A JPH02132402A JP28746388A JP28746388A JPH02132402A JP H02132402 A JPH02132402 A JP H02132402A JP 28746388 A JP28746388 A JP 28746388A JP 28746388 A JP28746388 A JP 28746388A JP H02132402 A JPH02132402 A JP H02132402A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- substrate
- transparent resin
- lens sheet
- roughening
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011347 resin Substances 0.000 claims abstract description 39
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 230000003746 surface roughness Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 11
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000007788 roughening Methods 0.000 abstract description 10
- 230000001680 brushing effect Effects 0.000 abstract description 3
- 239000000113 methacrylic resin Substances 0.000 abstract description 3
- 238000003848 UV Light-Curing Methods 0.000 abstract 3
- 230000001070 adhesive effect Effects 0.000 abstract 3
- 238000005422 blasting Methods 0.000 abstract 1
- VOBUAPTXJKMNCT-UHFFFAOYSA-N 1-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound CCCCCC(OC(=O)C=C)OC(=O)C=C VOBUAPTXJKMNCT-UHFFFAOYSA-N 0.000 description 4
- 229920000297 Rayon Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 235000019592 roughness Nutrition 0.000 description 3
- HCLJOFJIQIJXHS-UHFFFAOYSA-N 2-[2-[2-(2-prop-2-enoyloxyethoxy)ethoxy]ethoxy]ethyl prop-2-enoate Chemical compound C=CC(=O)OCCOCCOCCOCCOC(=O)C=C HCLJOFJIQIJXHS-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical class OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 125000004066 1-hydroxyethyl group Chemical group [H]OC([H])([*])C([H])([H])[H] 0.000 description 1
- 229920006353 Acrylite® Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004386 diacrylate group Chemical group 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- -1 polyol acrylate series Chemical class 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 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）
本発明は、ビデオプロジエクションテレビのスクリーン
に用いられるフレネルレンズやレンチキュラーレンズ、
あるいは集光用のフレネルレンズ等のレンズシートの製
造方法に関するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a Fresnel lens or a lenticular lens used in a video projection television screen.
Alternatively, the present invention relates to a method of manufacturing a lens sheet such as a Fresnel lens for condensing light.
（従来の技術）
フレネルレンズやレンチキュラーレンズ等のレンズシー
トを製造する場合、そのサイズが比較的小さく大量生産
するときは合成樹脂の射出成形の方法が行われているが
、上述したスクリーン用や集光用で比較的太き々サイズ
のレンズシートを製作する場合は、平板状のレンズ型に
樹脂板を当接し、これを加熱加圧してレンズ面を転写し
て製造するのが一般的である。(Prior art) When manufacturing lens sheets such as Fresnel lenses and lenticular lenses, injection molding of synthetic resin is used when the size is relatively small and mass production is required. When manufacturing relatively thick lens sheets for optical applications, it is common to attach a resin plate to a flat lens mold, heat and press it, and transfer the lens surface. .
ところがこの方法によるときは、加熱一冷却κ要する時
間が長くか覧り、生産性を上げられないとい・う難点が
あった。However, this method has the drawback that the time required for heating and cooling is long and productivity cannot be increased.
このため最近では、レンズ型と透明樹脂基板との間に紫
外線硬化型樹脂液を介在させ、紫外線を照射して硬化さ
せる方法が提案されている（特開昭６１−１７７２１５
号公報参照）。For this reason, a method has recently been proposed in which an ultraviolet curable resin liquid is interposed between the lens mold and the transparent resin substrate and cured by irradiation with ultraviolet rays (Japanese Patent Laid-Open No. 61-177215
(see publication).
（発明が解決しようとする課題）
しかしながら、上記の紫外線硬化型樹脂によってレンズ
部を形成する場合、透明樹脂基板とめ密着性が得られな
いことが多い。とシわけ透明樹脂基板として、透明性や
耐候性が優れこの種材料として好適なメタクリル樹脂は
、表面の活性が比較的乏しく、紫外線硬化型樹脂との密
着性を高めることが強く望まれてｂた。(Problems to be Solved by the Invention) However, when the lens portion is formed using the above-mentioned ultraviolet curable resin, adhesion to the transparent resin substrate is often not achieved. Methacrylic resin, which is suitable for use as a transparent resin substrate due to its excellent transparency and weather resistance, has relatively poor surface activity, and it is strongly desired to improve its adhesion with ultraviolet curable resins. Ta.
本発明はこのような状況に鑑み、紫外線硬化型樹脂の形
成される透明樹脂基板の面を、一定の粗さＫ粗面化する
という物理的方法について検討し、木発明を完成するに
至ったものである。In view of this situation, the present invention investigated a physical method of roughening the surface of a transparent resin substrate on which an ultraviolet curable resin is formed to a certain roughness, and completed the invention. It is something.
（課題を解決するための手段）
すなわち本発明は、上記の課題を達成しようとするもの
で、その要旨とするところは、透明樹脂基板とレンズ型
との間ｋ紫外線硬化型樹脂液を介在させたのち紫外線を
照射して透明樹脂基板の少なくと本一面ｋレンズ部を形
成するレンズシートの製造方法において、透明樹脂基板
の紫外線硬化型樹脂液の接する面を、予めＪｌＢ−Ｂ−
０６０１に準拠して測定した表面粗さの最大高さが０．
５〜１０μｍになるようＫ粗面化したことを特徴とする
レンズｙ｝の製造方法忙ある。(Means for Solving the Problems) That is, the present invention aims to achieve the above problems, and its gist is to interpose an ultraviolet curable resin liquid between a transparent resin substrate and a lens mold. In the method for manufacturing a lens sheet in which at least one lens portion of the transparent resin substrate is formed by irradiating ultraviolet rays afterward, the surface of the transparent resin substrate that is in contact with the ultraviolet curable resin liquid is preliminarily coated with JlB-B-
The maximum height of surface roughness measured in accordance with 0601 is 0.
A method for manufacturing a lens y} characterized by having a K-roughened surface of 5 to 10 μm is in progress.
以下、本発明をさらＫ詳細ｋ説明する。Hereinafter, the present invention will be explained in further detail.
本発明に使用する透明樹脂基板としては、上述したよう
にメタクリＶ樹脂板が適しているが、これ以外１ｃ４ポ
リカーボネート樹脂板やボリスチレン樹脂板等が使用し
つる。As the transparent resin substrate used in the present invention, a methacrylic V resin plate is suitable as described above, but other materials such as a 1c4 polycarbonate resin plate and a polystyrene resin plate can also be used.
そして本発明は、このような透明樹脂基板の紫外線硬化
型樹脂液の接する面を、予めＪ工ＢＢ−０６１０Ｋ″準
拠して測定した表面粗さの最大高さが１１．５〜１０μ
ｍ忙なるように粗面化することを特徴とするものである
。この最大高さの値が１５μｍ未満であると、粗面化の
効果がなく密着性が向上せず、また１０μｍを超えると
粗面化κ時間がか＼シすぎ、しかも粗面の程度Ｋ斑が生
じ易く、紫外線硬化型樹脂液を硬化させたのちこの斑が
見立ってしまうことがあシ好ましくない。In addition, the present invention provides that the surface of such a transparent resin substrate in contact with the ultraviolet curable resin liquid has a maximum height of surface roughness of 11.5 to 10 μm, which is measured in advance in accordance with J Engineering BB-0610K.
It is characterized by a roughened surface. If the value of this maximum height is less than 15 μm, there will be no effect of roughening and the adhesion will not improve, and if it exceeds 10 μm, the roughening time will be too long and the degree of roughness will be uneven. This tends to occur, and it is undesirable that these spots become visible after the ultraviolet curable resin liquid is cured.
このような粗面化の方法としては、次の例を挙げること
ができる。Examples of such surface roughening methods include the following.
■プラスト処理
■サンデイング
■ブラッシング
■表面研削
まず■のプラスト処理としては、ガラスビーズ、酸化ア
ルミニウム、酸化鉄等の微粒子を加圧して吹き付ける方
法である。使用する微粒子の粒径と、加圧の程度を調節
することにより、種々の粗さにすることができる。■Plast treatment ■Sanding ■Brushing ■Surface grinding First, the blast treatment (■) involves spraying fine particles such as glass beads, aluminum oxide, iron oxide, etc. under pressure. Various roughnesses can be obtained by adjusting the particle size of the fine particles used and the degree of pressurization.
■のサンデイングは、サンドベーバーを用いて粗面化す
る簡便な方法であり、特に枚数の小さいときには有利で
ある。この方法を効率させたものとしては、サンドベー
バーをエンドレスベルト状Ｋしたべｖトサンダーや、デ
ィスク状の研摩板を回転したディスクサンダーがあり、
これκよって粗面化させてもよい。この方法κよる粗面
化の場合は、無方向性の粗面にすること本できるし、ヘ
アーラインといわれるすし状の粗面とすることも可能で
ある。Sanding (2) is a simple method of roughening the surface using a sand barber, and is particularly advantageous when the number of sheets is small. Efficient versions of this method include the V-sander, which uses sandbaver in the form of an endless belt, and the disc sander, which uses a rotating disc-shaped abrasive plate.
The surface may be roughened by this κ. In the case of surface roughening by this method κ, it is possible to obtain a non-directional rough surface, and it is also possible to obtain a sushi-shaped rough surface called a hairline.
また■のブラッシングは、金属製ブラシや研摩剤入υの
ナイロンブラシで粗面化する方法であ〕、ブラシはロー
ル状にして回転させることｋよシ効率よ〈粗面化するこ
とができる。Brushing (2) is a method of roughening the surface using a metal brush or a nylon brush containing an abrasive.The brush can be rolled and rotated to roughen the surface more efficiently.
さらｋ■の表面研削は、透明樹脂基板の表層部をフライ
ス盤等で切削し、表面を粗面化する方法である。この方
法はシケラツプで表面を削る方法本属するが、生産性は
若干低いため枚数が少ｆｋｔ，ｎ場合忙適している。Surface grinding is a method of roughening the surface by cutting the surface layer of the transparent resin substrate with a milling machine or the like. This method belongs to the method of scraping the surface with a skelp, but the productivity is a little low, so it is suitable when the number of sheets is small.
との粗面化は、上記以外の方法本使用しうるが、例えば
粗面化した金属板を熱転写する方法や粗面化した鋳型を
用いて鋳込重合し、粗面化した樹脂板を得る方法等があ
る。Methods other than those described above can be used to roughen the surface, such as thermal transfer of a roughened metal plate or cast polymerization using a roughened mold to obtain a roughened resin plate. There are methods etc.
以上のよう忙して得た透明樹脂基板とレンズ型とを対設
し、この間κ紫外線硬化型樹脂液を介在させ、次いで紫
外線を照射させるが、この場合のレンズ型としてはフＶ
ネＶレンズ、レンチキュラーレンズあるいはプライアイ
を与える面を本った金属や合成樹脂製の型を用いること
ができる。The transparent resin substrate and lens mold obtained in the above manner are placed opposite each other, a κ ultraviolet curing resin liquid is interposed therebetween, and ultraviolet rays are then irradiated.
A V lens, a lenticular lens, or a mold made of metal or synthetic resin and having a surface that provides a ply eye can be used.
また紫外線硬化型樹脂としては、特に限定されないが、
一般に用いられているエポキシアクリＶ−｝糸、ウレタ
ンアクリレート系、ポリエステルアクリレート系、ポリ
オールアクリレト系等が使用しうる。そして同時に使用
される反応性稀釈七ノマーけ、１つあるいはそれ以上の
反応性モノ、ジあるいは多官能アクリル系七ノマー、例
えばペンタエリスリトーＭトリアクリレート、トリメチ
ロールプロパントリアクリレート、ヘキサンジオールジ
アクリレート、ヘキサンジオーＭジアクリレート、テト
ラエチレングリコールジアクリレート、イソホルニルア
クリレート等が使用しうる。In addition, although there are no particular limitations on the ultraviolet curable resin,
Commonly used epoxy acrylic V-} threads, urethane acrylate series, polyester acrylate series, polyol acrylate series, etc. can be used. and simultaneously used reactive diluent heptanomers, one or more reactive mono-, di- or polyfunctional acrylic heptanomers, such as pentaerythritome triacrylate, trimethylolpropane triacrylate, hexanediol diacrylate, Hexanedioh M diacrylate, tetraethylene glycol diacrylate, isofornylacrylate, etc. can be used.
そしてこれらの紫外線硬化型樹脂液の硬化は一般に行わ
れて込る方法で行うことができる。These ultraviolet curable resin liquids can be cured by a commonly used method.
（実施例） 以下、具体的実施例について説明する。(Example) Specific examples will be described below.
透明樹脂基板として、厚さ３暉のメタクリル樹脂板［ア
クリライト＋ＯＯＯＪ（三菱レイヨン社製、紫外線吸収
剤を含まないもの）を用い、紫外線硬化型樹脂液として
は下記の組成のものを用いた。As a transparent resin substrate, a methacrylic resin plate with a thickness of 3 mm [Acrylite + OOOJ (manufactured by Mitsubishi Rayon Co., Ltd., containing no ultraviolet absorber) was used, and as an ultraviolet curable resin liquid, one having the following composition was used.
・三菱レイヨン社製ウレタンアクリレートｒｖｘ−６ｏ
３ｓＪ （Ｓｏ重量一・三愛レイヨン社製ヒ
ドロキシエチ〃アクリレート「アクリエステ７Ｌ／ＨＯ
Ｊ ４０重量係・ペンゾフエノン ３重量憾（上
記の２つの和に対して）上記透明樹脂基板は、予め第１
表の如き粗面化を施し、フレネルレンズ型と対設し、こ
の間Ｋ紫外線硬化型樹脂液を介在させた。次Ｋこの透明
樹脂基板側から、８０Ｗの高圧水銀灯３灯で照射距離１
５国、移動速度５ ｍ ／分の条件で紫外線を照射し、
硬化させてレンズ部を一体的に形成した。・Mitsubishi Rayon urethane acrylate rvx-6o
3sJ (So weight 1/Hydroxyethyl acrylate manufactured by Sanai Rayon Co., Ltd. "Acrieste 7L/HO
J 40 weight: Penzophenone 3 weight (for the sum of the above two)
The surface was roughened as shown in the table and placed opposite to a Fresnel lens mold, during which K ultraviolet curable resin liquid was interposed. Next: From this transparent resin substrate side, irradiation distance is 1 with three 80W high-pressure mercury lamps.
5 countries, irradiated with ultraviolet rays at a moving speed of 5 m/min,
The lens portion was integrally formed by curing.
ｉられたフレネルレンズシートの密着性を、ＪＩ８ Ｋ
５４００に準拠し粘着テープκよるクロスカットの密着
性テストによって評価としたところ、第１表の如き結果
が得られ、本発明の優位性が確認された。JI8K
When the cross-cut adhesion test using adhesive tape κ was carried out in accordance with 5400, the results shown in Table 1 were obtained, confirming the superiority of the present invention.
第 １ 表
手続補正書
（発明の効果）
本発明は以上詳述した如き構成からなるものであるから
、レンズ部と透明樹脂基板との密着性の高ｔｎレンズシ
ートを得ることができ、しかも特別な装置本必要としな
いため効率よく製造しうる利点がある。Table 1 Procedural Amendment Statement (Effects of the Invention) Since the present invention has the configuration as detailed above, it is possible to obtain a tn lens sheet with high adhesion between the lens portion and the transparent resin substrate, and moreover, a special It has the advantage that it can be manufactured efficiently because it does not require a large amount of equipment.
１．事件の表示 特願昭６３−２Ｂ７４６３号ｚ発明
ｏ名称 レンズシートの製造方法＆補正をする者
事件との関係 特許出願人
東京都中央区京橋二丁目３番１９号
（６０３）三菱レイヨン株式会社
取締役社長 永 井 彌太郎
歳代理人
〒１０４東京都中央区京橋二丁目３番１９号ｌ補正の内
容
《１》明細書第４頁第１５行の「見立って」を「目立っ
て」に補正する。1. Indication of the case: Patent Application No. 63-2B7463 Invention: Name: Lens sheet manufacturing method & person making the correction Relationship to the case: Patent applicant: Director, Mitsubishi Rayon Co., Ltd., 3-19 Kyobashi 2-chome, Chuo-ku, Tokyo (603) President Yataro Nagai Agent Address: 2-3-19 Kyobashi, Chuo-ku, Tokyo 104 Contents of the amendment 1. Amend "conspicuously" to "conspicuously" on page 4, line 15 of the specification.
（２）同第７頁第７行〜第８行の「ヘキサンジオールジ
アクリレート，ヘキサンジオールジアクリレート」を「
ヘキサンジオールジアクリレート」に補正する。(2) “Hexanediol diacrylate, hexanediol diacrylate” on page 7, lines 7 to 8 is “
Hexanediol diacrylate”.
（３） 同第８頁第１行のｒｔｒｘ−６ｏｘａ，Ｊを
ｒＵｘ−６ｏ３６ｊに補正する。(3) Correct rtrx-6oxa,J in the first line of page 8 to rUx-6o36j.
（４）同第９頁第１表内の第３行の「サンドプラスト」
を「サンデイング」に補正する。(4) "Sandplast" in the 3rd row of Table 1 on page 9
to "sanding".
Claims (1)
を介在させたのち紫外線を照射して透明樹脂基板の少な
くとも一面にレンズ部を形成するレンズシートの製造方
法において、透明樹脂基板の紫外線硬化型樹脂液の接す
る面を、予めＪＩＳ−Ｂ−０６０１に準拠して測定した
表面粗さの最大高さが０．０５〜１０μｍになるように
粗面化したことを特徴とするレンズシートの製造方法。In a method for manufacturing a lens sheet, the method includes interposing an ultraviolet curable resin liquid between a transparent resin substrate and a lens mold, and then irradiating ultraviolet rays to form a lens portion on at least one surface of the transparent resin substrate. Manufacture of a lens sheet characterized in that the surface in contact with mold resin liquid is roughened so that the maximum surface roughness height measured in accordance with JIS-B-0601 is 0.05 to 10 μm. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28746388A JPH02132402A (en) | 1988-11-14 | 1988-11-14 | Production of lens sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28746388A JPH02132402A (en) | 1988-11-14 | 1988-11-14 | Production of lens sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02132402A true JPH02132402A (en) | 1990-05-21 |
Family
ID=17717662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28746388A Pending JPH02132402A (en) | 1988-11-14 | 1988-11-14 | Production of lens sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02132402A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992011320A1 (en) * | 1990-12-17 | 1992-07-09 | Dai Nippon Printing Co., Ltd. | Lens forming composition, fresnel lens prepared therefrom, and transmission screen |
| WO2004003661A1 (en) * | 2002-06-27 | 2004-01-08 | Dai Nippon Printing Co., Ltd. | Projection screen and projection display device |
-
1988
- 1988-11-14 JP JP28746388A patent/JPH02132402A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992011320A1 (en) * | 1990-12-17 | 1992-07-09 | Dai Nippon Printing Co., Ltd. | Lens forming composition, fresnel lens prepared therefrom, and transmission screen |
| WO2004003661A1 (en) * | 2002-06-27 | 2004-01-08 | Dai Nippon Printing Co., Ltd. | Projection screen and projection display device |
| US7072109B2 (en) | 2002-06-27 | 2006-07-04 | Dai Nippon Printing Co., Ltd. | Projection screen and projection display |
| KR100708877B1 (en) * | 2002-06-27 | 2007-04-18 | 다이니폰 인사츠 가부시키가이샤 | Projection screen and projection display device |
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