JPH036502A - Manufacture of multi-focal point fresnel lens - Google Patents
Manufacture of multi-focal point fresnel lensInfo
- Publication number
- JPH036502A JPH036502A JP14049989A JP14049989A JPH036502A JP H036502 A JPH036502 A JP H036502A JP 14049989 A JP14049989 A JP 14049989A JP 14049989 A JP14049989 A JP 14049989A JP H036502 A JPH036502 A JP H036502A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- fresnel lens
- glass transition
- transition temperature
- stretched
- 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 15
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 13
- 239000000057 synthetic resin Substances 0.000 claims abstract description 13
- 230000009477 glass transition Effects 0.000 claims description 22
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 abstract 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- ROLAGNYPWIVYTG-UHFFFAOYSA-N 1,2-bis(4-methoxyphenyl)ethanamine;hydrochloride Chemical compound Cl.C1=CC(OC)=CC=C1CC(N)C1=CC=C(OC)C=C1 ROLAGNYPWIVYTG-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- QIWKUEJZZCOPFV-UHFFFAOYSA-N phenyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC1=CC=CC=C1 QIWKUEJZZCOPFV-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- SYFOAKAXGNMQAX-UHFFFAOYSA-N bis(prop-2-enyl) carbonate;2-(2-hydroxyethoxy)ethanol Chemical compound OCCOCCO.C=CCOC(=O)OCC=C SYFOAKAXGNMQAX-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、背面投影型スクリーン等に用いられる多焦点
フレネルレンズの製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a multifocal Fresnel lens used for rear projection screens and the like.
【従来の技術Ｊ
従来から、縦方向および横方向の焦点距離を変えた多焦
点フレネルレンズが知られており、この多焦点フレネル
レンズを用いることで、背面投影型スクリーンにおける
スクリーンの視認性を向上させ得ることが、実開昭５３
−１４４３４７号公報、実開昭５７−１２４８３７号公
報および特公昭６４−９１８３号公報に開示されている
。また、この多焦点フレネルレンズの製造方法について
は、特公昭６４−９１８３号公報に、縦方向と横方向の
延伸倍率が異なるようにして製作された熱可塑性合成樹
脂板にフレネルレンズを切削してレンズ面を形成した後
、前記熱可塑性合成樹脂板を加熱処理する方法が開示さ
れている。[Prior art J] A multifocal Fresnel lens with different focal lengths in the vertical and horizontal directions has been known for a long time, and by using this multifocal Fresnel lens, the visibility of the screen on a rear projection screen is improved. It is possible to
It is disclosed in Japanese Patent Publication No. 144347, Japanese Utility Model Application Publication No. 57-124837, and Japanese Patent Publication No. 64-9183. Furthermore, regarding the manufacturing method of this multifocal Fresnel lens, as described in Japanese Patent Publication No. 64-9183, a Fresnel lens is cut into a thermoplastic synthetic resin plate manufactured with different stretching ratios in the vertical and horizontal directions. A method is disclosed in which the thermoplastic synthetic resin plate is heat-treated after forming the lens surface.
しかしながら、上記従来の製造方法には、延伸後、熱可
塑性合成樹脂板を加熱により収縮させても完全に元の形
状にはならないために、寸法制御や収縮率制御が困難で
ある、という問題がある。However, the conventional manufacturing method described above has a problem in that even if the thermoplastic synthetic resin plate is heated and shrunk after stretching, it does not completely return to its original shape, making it difficult to control dimensions and shrinkage rate. be.
また熱可塑性樹脂では耐熱性に問題があり、例えば、光
源の近（にこれを置くと、その熱で、経時的に変形して
しまう問題がある。Additionally, thermoplastic resins have a problem with heat resistance; for example, if they are placed near a light source, the heat will cause them to deform over time.
【課題を解決するための手段］
本発明は以上の点に鑑み、上記従来技術にみられる問題
を解消することを目的とするもので、この目的を達成す
るため、まず第１請求項に示すように、三次元網目構造
を有する合成樹脂板をガラス転移温度以上の温度下で縦
方向と横方向の延伸倍率が異なるように延伸し、その状
態で、ガラス転移温度以下に冷却して延伸板を成形し、
前記延伸板の片面にフレネルレンズを切削してレンズ面
を形成し、然る後に、前記延伸板をガラス転移温度以上
の温度に加熱処理することとした。[Means for Solving the Problems] In view of the above points, it is an object of the present invention to solve the problems seen in the above-mentioned prior art. In this way, a synthetic resin plate having a three-dimensional network structure is stretched at a temperature above the glass transition temperature so that the stretching ratios in the longitudinal and transverse directions are different, and in this state, the stretched plate is cooled to below the glass transition temperature. mold and
A Fresnel lens was cut on one side of the stretched plate to form a lens surface, and then the stretched plate was heat-treated to a temperature equal to or higher than the glass transition temperature.
また第２請求項による製造方法は、三次元網目構造を有
する合成樹脂板をガラス転移温度以上の温度下で縦方向
と横方向の延伸“倍率が同じになるように延伸し、その
状態で、ガラス転移温度以下に冷却して延伸板を成形し
、前記延伸板の片面にフレネルレンズを切削してレンズ
面を形成し、然る後に、前記延伸板をガラス転移温度以
上の温度に加熱処理し、この際、縦方向および横方向に
異なるテンションをかけて縦方向および横方向の収縮率
を変えることを特徴とする。Further, the manufacturing method according to the second claim is such that a synthetic resin plate having a three-dimensional network structure is stretched at a temperature equal to or higher than the glass transition temperature so that the stretching ratio in the vertical direction and the horizontal direction is the same, and in this state, A drawn plate is formed by cooling to a temperature below the glass transition temperature, a Fresnel lens is cut on one side of the drawn plate to form a lens surface, and then the drawn plate is heat-treated to a temperature above the glass transition temperature. At this time, different tensions are applied in the vertical and horizontal directions to change the shrinkage rates in the vertical and horizontal directions.
また第３請求項による製造方法は、三次元網目構造を有
する合成樹脂板の片面にフレネルレンズを切削してレン
ズ面を形成し、前記樹脂板をガラス転移温度以上の温度
下で縦方向と横方向の延伸倍率が異なるように延伸し、
その状態で、ガラス転移温度以下に冷却することを特徴
とする。Further, in the manufacturing method according to the third aspect, a Fresnel lens is cut on one side of a synthetic resin plate having a three-dimensional network structure to form a lens surface, and the resin plate is cut in the vertical and horizontal directions at a temperature higher than the glass transition temperature. Stretched so that the stretching ratio in the direction is different,
In this state, it is characterized by being cooled to below the glass transition temperature.
三次元網目構造を有する合成樹脂板には、加熱処理によ
って延伸前の形状に戻る際に、略完全に元の形状に戻る
特性があり、本発明の製造方法はこの特性を最大限利用
している。またテンションをかけた状態で加熱処理すれ
ば収縮率を容易に制御することができる。またレンズを
三次元網目構造を有する硬化性樹脂としたため、耐熱性
についても優れた結果を得ることができる。A synthetic resin plate having a three-dimensional network structure has the property of almost completely returning to its original shape when it returns to its original shape by heat treatment, and the manufacturing method of the present invention takes full advantage of this property. There is. Furthermore, if the heat treatment is performed under tension, the shrinkage rate can be easily controlled. Furthermore, since the lens is made of a curable resin having a three-dimensional network structure, excellent results can also be obtained in terms of heat resistance.
第１、第３請求項による製造方法については、縦方向お
よび横方向の何れか一方向の延伸処理でもよいし、第２
請求項による製造方法については縦方向および横方向の
何れか一方向だけテンションをかけた状態で収縮させて
もよい。Regarding the manufacturing method according to the first and third claims, stretching treatment may be performed in either one of the longitudinal direction and the transverse direction, or
Regarding the manufacturing method according to the claims, the shrinkage may be performed while applying tension in only one direction, either the vertical direction or the horizontal direction.
本発明に用いられる硬化性樹脂としては、第１請求項に
よる場合、成形品をガラス転移温度以上としても、もは
や収縮は起こらないことから、ガラス転移温度が特に高
いものを用いる必要はなく、三次元網目構造を有してい
れば、どのような透明樹脂を用いてもかまわない。また
第２、第３請求項による場合、ガラス転移温度以上にす
ると収縮が起こり得るため、成形品の周端部分を枠に接
着する等の方法で固定するか、もしくはガラス転移温度
の高い透明樹脂を選択使用する。As the curable resin used in the present invention, in the case of the first claim, even if the molded article is made to have a glass transition temperature or higher, shrinkage no longer occurs, so there is no need to use a resin with a particularly high glass transition temperature, and the curable resin Any transparent resin may be used as long as it has an original network structure. In addition, in the case of the second and third claims, since shrinkage may occur if the temperature exceeds the glass transition temperature, the peripheral edge of the molded product must be fixed by gluing or other methods to the frame, or a transparent resin with a high glass transition temperature must be used. Select and use.
つぎに、本発明の実施例を図面にしたがって説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
（第１実施例、第１図）
まず、フェニルメタクリレート６０部、ジアリルイソフ
タレート４０部およびジイソプロピルパーオキシジカー
ボネート ２部よりなる混合液を注型重合して、三次元
網目構造を有する、縦横それぞれ１０、０ｃｍの透明樹
脂板（ｌ、元板）を成形する（同図Ａ） ガラス転移温
度は、約１４０℃である。(First Example, FIG. 1) First, a mixed solution consisting of 60 parts of phenyl methacrylate, 40 parts of diallyl isophthalate, and 2 parts of diisopropyl peroxydicarbonate was cast-polymerized to form a three-dimensional network structure. A 10.0 cm transparent resin plate (l, original plate) is molded (A in the same figure). The glass transition temperature is about 140°C.
次いで、この樹脂板（１）を、１８０℃の条件下で、縦
方向（延伸倍率１３０％）および横方向（同１２０％）
に延伸処理し、この状態を保ちつつ、室温まで徐冷して
延伸板（１°）を成形する（同図Ｂ） 次いで、この延
伸板（１゛）の片面に同心円状のフレネルレンズ（ピッ
チｏ、 ４ｍｍ）を切削してレンズ面（２）を形成しく
同図Ｃ）、然る後、この延伸板（１°）を１８０℃に加
熱処１理して延伸前の形状に収縮させ、以上の工程によ
って、多焦点フレネルレンズ（１”）を製造した（同図
Ｄ）。レンズ（１”）の大きさは元板（１）に対して縦
、横ともに±２％以内であった。Next, this resin plate (1) was stretched in the longitudinal direction (stretching ratio: 130%) and the transverse direction (stretching ratio: 120%) at 180°C.
While maintaining this state, the drawn plate (1°) is slowly cooled to room temperature to form a drawn plate (1°).Next, a concentric Fresnel lens (pitch) is placed on one side of this drawn plate (1°). o, 4 mm) to form the lens surface (2) (C) in the same figure.Then, this stretched plate (1°) was heated to 180°C to shrink it to the shape before stretching. Through the above process, a multifocal Fresnel lens (1") was manufactured (D in the same figure).The size of the lens (1") was within ±2% of the original plate (1) both vertically and horizontally. .
（第２実施例、第２図）
第１実施例に対して同じ材質と大きさの透明樹脂板（１
、元板）を成形しく同図Ｅ） この樹脂板（１）を１８
０℃の条件下で縦、横同倍率（延伸倍率１２０％）に延
伸処理し、この状態を保ちつつ、室温まで徐冷して延伸
板（１°）を成形する（同図Ｆ） 次いで、この延伸板
（１゛）の片面に同心円状のフレネルレンズ（ピッチ０
．４ｍｍ）を切削してレンズ面（２）を形成しく同図Ｇ
） 然る後、この延伸板（１°）を縦方向のみ端部を保
持して １８０℃に加熱処理して横方向にのみ収縮させ
（同図Ｈ）、この状態を保ちつつ、室温まで徐冷して、
多焦点フレネルレンズ（１”）を得た（同図１） レン
ズ（ｌ”）の横幅は元板（１）に対して±４％以内であ
った。(Second embodiment, Fig. 2) A transparent resin plate (1
, the original plate) is molded, and this resin plate (1) is
It is stretched to the same length and width (stretching ratio 120%) under the condition of 0°C, and while maintaining this state, it is slowly cooled to room temperature to form a stretched plate (1°) (FIG. F). A concentric Fresnel lens (pitch 0
．． 4mm) to form the lens surface (2).
) After that, this stretched plate (1°) was heated to 180°C while holding the edges only in the vertical direction to shrink only in the horizontal direction (H in the same figure), and while maintaining this state, it was slowly heated to room temperature. Cool,
A multifocal Fresnel lens (1") was obtained (FIG. 1). The width of the lens (1") was within ±4% of the original plate (1).
（第３実施例、第３図）
フェニルメタクリレート６０部、ジアリルイソフタレー
ト４０部およびジエチレングリコールビスアリルカーボ
ネート ２部よりなる混合液を注型重合して、三次元網
目構造を有する、縦横それぞれ１０．０ｃｍの透明樹脂
板（１、元板）を成形し、この樹脂板（１）の片面に同
心円状のフレネルレンズ（ピッチ０．４ｍｍ ）を切削
してレンズ面（２）を形成する（同図Ｊ） ガラス転移
温度は、約１５０℃である。然る後、この樹脂板（１）
を１８０℃の条件下で縦方向のみ延伸処理（延伸倍率１
２０％）シ（同図Ｋ） この状態を保ちつつ、室温まで
徐冷して、多焦点フレネルレンズ（ｌ”）を得た（同図
Ｌ）
〔発明の効果］
第４図は、上記各実施例で製造した多焦点フレネルレン
ズ（ｌ”）の、製造中途における収縮の様子を概略的な
断面で示しており、三次元網目構造を有する合成樹脂は
このようにスムーズに収縮して元の状態に戻る。したが
って、本発明によれば、寸法制御や収縮率制御が容易に
なり、任意の焦点のフレネルレンズを簡単に製造するこ
とができる。また本発明によるフレネルレンズは耐熱性
についても改良されている。(Third Example, Figure 3) A mixture of 60 parts of phenyl methacrylate, 40 parts of diallyl isophthalate, and 2 parts of diethylene glycol bisallyl carbonate was cast-polymerized to form a three-dimensional network structure of 10.0 cm in length and width. A transparent resin plate (1, original plate) is molded, and a concentric Fresnel lens (pitch 0.4 mm) is cut on one side of this resin plate (1) to form a lens surface (2) (see J in the same figure). ) The glass transition temperature is approximately 150°C. After that, this resin plate (1)
Stretched only in the longitudinal direction at 180°C (stretching ratio 1)
20%) (K in the same figure) While maintaining this state, the lens was slowly cooled to room temperature to obtain a multifocal Fresnel lens (l'') (L in the same figure) [Effect of the invention] Figure 4 shows the above-mentioned lenses. This is a schematic cross-sectional view showing how the multifocal Fresnel lens (l'') manufactured in the examples shrinks during the manufacturing process. Return to state. Therefore, according to the present invention, size control and shrinkage rate control are facilitated, and a Fresnel lens with an arbitrary focal point can be easily manufactured. The Fresnel lens according to the present invention also has improved heat resistance.
第１図ないし第３図はそれぞれ本発明の実施例に係る多
焦点フレネルレンズの製造方法を示す工程説明図、第４
図はフレネルレンズの収縮変化を示す概略的な断面図で
ある。1 to 3 are process explanatory diagrams showing a method for manufacturing a multifocal Fresnel lens according to an embodiment of the present invention, and FIG.
The figure is a schematic cross-sectional view showing changes in shrinkage of a Fresnel lens.
Claims (1)
度以上の温度下で縦方向と横方向の延伸倍率が異なるよ
うに延伸し、その状態で、ガラス転移温度以下に冷却し
て延伸板を成形し、前記延伸板の片面にフレネルレンズ
を切削してレンズ面を形成し、然る後に、前記延伸板を
ガラス転移温度以上の温度に加熱処理することを特徴と
する多焦点フレネルレンズの製造方法。 ２、三次元網目構造を有する合成樹脂板をガラス転移温
度以上の温度下で縦方向と横方向の延伸倍率が同じにな
るように延伸し、その状態で、ガラス転移温度以下に冷
却して延伸板を成形し、前記延伸板の片面にフレネルレ
ンズを切削してレンズ面を形成し、然る後に、前記延伸
板をガラス転移温度以上の温度に加熱処理し、この際、
縦方向および横方向に異なるテンションをかけて縦方向
および横方向の収縮率を変えることを特徴とする多焦点
フレネルレンズの製造方法。 ３、三次元網目構造を有する合成樹脂板の片面にフレネ
ルレンズを切削してレンズ面を形成し、前記樹脂板をガ
ラス転移温度以上の温度下で縦方向と横方向の延伸倍率
が異なるように延伸し、その状態で、ガラス転移温度以
下に冷却することを特徴とする多焦点フレネルレンズの
製造方法。[Claims] 1. A synthetic resin plate having a three-dimensional network structure is stretched at a temperature higher than the glass transition temperature so that the stretching ratios in the longitudinal and horizontal directions are different, and in this state, the stretching ratio is lower than the glass transition temperature. The method is characterized in that a drawn plate is formed by cooling, a Fresnel lens is cut on one side of the drawn plate to form a lens surface, and then the drawn plate is heat-treated to a temperature equal to or higher than the glass transition temperature. A method of manufacturing a multifocal Fresnel lens. 2. A synthetic resin plate having a three-dimensional network structure is stretched at a temperature higher than the glass transition temperature so that the stretching ratio in the longitudinal and horizontal directions is the same, and in that state, it is cooled to below the glass transition temperature and stretched. A plate is formed, a Fresnel lens is cut on one side of the stretched plate to form a lens surface, and then the stretched plate is heated to a temperature equal to or higher than the glass transition temperature, and at this time,
A method for producing a multifocal Fresnel lens characterized by applying different tensions in the longitudinal and lateral directions to change shrinkage rates in the longitudinal and lateral directions. 3. A Fresnel lens is cut on one side of a synthetic resin plate having a three-dimensional network structure to form a lens surface, and the resin plate is stretched at different magnifications in the vertical and horizontal directions at a temperature higher than the glass transition temperature. A method for producing a multifocal Fresnel lens, which comprises stretching and cooling the lens to below its glass transition temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14049989A JPH036502A (en) | 1989-06-02 | 1989-06-02 | Manufacture of multi-focal point fresnel lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14049989A JPH036502A (en) | 1989-06-02 | 1989-06-02 | Manufacture of multi-focal point fresnel lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH036502A true JPH036502A (en) | 1991-01-14 |
Family
ID=15270056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14049989A Pending JPH036502A (en) | 1989-06-02 | 1989-06-02 | Manufacture of multi-focal point fresnel lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH036502A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501885A (en) * | 2017-01-13 | 2017-03-15 | 京东方科技集团股份有限公司 | Lens and its manufacture method and optical display means |
-
1989
- 1989-06-02 JP JP14049989A patent/JPH036502A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501885A (en) * | 2017-01-13 | 2017-03-15 | 京东方科技集团股份有限公司 | Lens and its manufacture method and optical display means |
| US10859822B2 (en) | 2017-01-13 | 2020-12-08 | Beijing Boe Optoelectronics Technology Co., Ltd. | Lens, optical display device and manufacturing method for lens |
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