JPS59137902A - Fresnel lens made of plastic - Google Patents
Fresnel lens made of plasticInfo
- Publication number
- JPS59137902A JPS59137902A JP1150783A JP1150783A JPS59137902A JP S59137902 A JPS59137902 A JP S59137902A JP 1150783 A JP1150783 A JP 1150783A JP 1150783 A JP1150783 A JP 1150783A JP S59137902 A JPS59137902 A JP S59137902A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- fresnel lens
- resin
- mold
- synthetic resin
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00269—Fresnel lenses
-
- 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
- B29L2011/0016—Lenses
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は強化され・た合成樹脂製７レネルレ゛ンズ、に
係る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to reinforced synthetic resin 7-renel lenses.
これまで合成樹脂製７レネルレンズは、メチルメタクリ
レートの鋳込み重合等で成形されてきた。Until now, synthetic resin 7-renel lenses have been molded by casting polymerization of methyl methacrylate.
これ等の合成樹脂製フレネルレンズは、レンズの（椰の
ノツチ効果のため削れやばく、強化されたレンズが要求
されている。These synthetic resin Fresnel lenses are easily scratched due to the (coconut notch effect) of the lens, and a reinforced lens is required.
゛本発明はレンズの碑の・ノツチ効果のため割れやすい
欠点を合成樹脂の配向により強化された合成樹脂フレネ
ルレンズである。具体的にはフレネルレンズの溝方向と
はｔ１直角方向に１軸配向された合成樹脂製フレネルレ
ンｆ、あるいは２軸配向された合成樹脂製フレネルレン
ズである。合成樹脂は配向により耐備撃強度を著るしく
向上させるこへ
とができる。゛The present invention is a synthetic resin Fresnel lens that has been strengthened by the orientation of the synthetic resin to overcome the drawback that the lens is prone to breakage due to the notch effect. Specifically, the groove direction of the Fresnel lens is a synthetic resin Fresnel lens f that is uniaxially oriented in the direction perpendicular to t1, or a synthetic resin Fresnel lens that is biaxially oriented. The impact resistance of synthetic resins can be significantly improved by orientation.
本発明に述べる合成樹脂とは透明な熱可塑性樹脂であり
、特に、ポリメチルメタクリレート、ポリカーボネート
、ポリスチレン、スチレン−アクリロニトリル共産合体
、ポリ塩化ビニル等は良好に使用できる。しかし、特に
好ましいのは、メチルメタクリレートを主体としたアク
リル樹脂であり、メチルメタクリレートのホモポリマー
、メチルメタクリレートースチレンー無水マレイン酸３
元系共重合体゛あるいはこれ等アクリル樹脂に微少の紫
外線吸収剤を配合した樹脂である、 □本発明
を図面により説明する。The synthetic resin mentioned in the present invention is a transparent thermoplastic resin, and in particular, polymethyl methacrylate, polycarbonate, polystyrene, styrene-acrylonitrile copolymer, polyvinyl chloride, etc. can be used satisfactorily. However, particularly preferred are acrylic resins mainly composed of methyl methacrylate, such as homopolymers of methyl methacrylate, methyl methacrylate-styrene-maleic anhydride 3
□The present invention will be explained with reference to the drawings.
フレネルレンズには第６図に示す様に溝１があり、衝撃
が加えられた時この溝１がノツチの拗きをして溝方向に
割れる。本発明はこの割れを防ぐものであり、第４図の
同心円状に溝を有゛するフレネルレンズでは放射状２の
配向を与えることにより割れを防止することができる。The Fresnel lens has a groove 1 as shown in FIG. 6, and when an impact is applied, this groove 1 becomes a notch and breaks in the direction of the groove. The present invention is intended to prevent this cracking, and in the Fresnel lens shown in FIG. 4 having concentric grooves, cracking can be prevented by providing a radial 2 orientation.
ｒＭ５図の平行状ＶＣ溝を有するフレネルレンズでは溝
方向とｉｔ ｙ直角方向３の配向を与えることにより割
れを防止することができる。放射状の配向を与えるには
射出成形のゲート立置を中央にとればよい。一般に射出
成形では’７”−）からの流動距離りと肉厚Ｔの比Ｌ／
Ｔが１００以下が多く、大型成形品の成形では多点’Ｆ
”−）を用いる場合が多い。同心円状の溝を何するフレ
ネルレンズではＬ／Ｔが１００以上の大型成形品でも１
点ゲートが好ましい。平行状の溝を有するフレネルレン
ズに該購と直角方向の配向を与えるには、第５図に示す
様に片端４よりフィルムゲートな用いて溝と直角゛方向
に射出成形する方法、あるいは、シートを溝と直角方向
３に延伸あるいは圧延する方法等により得る。レンズの
溝と直角方向に射出成形を行い、該溝と直角方向の配向
をかけるには、金型キャビティの肉厚が薄い方が配向が
かかりやすい。型キャビティの肉厚を博（しておき、樹
脂の射出量に応じて肉厚を厚くする成形法が好ましい′
、第１１図を用いて説明する。７レネルレンズの型キャ
ビティ１０を型材１１と型材１２を閉じて薄肉の状態に
保ち、合成樹脂をランナー１３、フィルムｒ−ト１４を
経て射出する（第１１図、Ａ）。型キャピテイ１０が合
成樹脂で満たされ、史に射出を続けると、型材１２が後
退して型キャビティが拡大され肉厚が厚くなる（第１１
図、Ｂ）。この様に薄肉に設定された型キャビティに射
出することにより、最終成形品が厚内でも流動配向が大
きくなる。この場合、型締力が樹脂の射出圧力で負ける
様に設定しておく必要がある。レンズの溝と直角方向［
ａｔ向、 をかける別の方法゛とじて、合成樹脂の厚い
板状型物を、該樹脂のガラス転移温度以上、溶融点まで
の温度に予熱し、加熱されたレンズ型を有する圧縮金型
内に咲゛き゛圧縮して配向をかけっつＪンズを成形する
ことができる。樹脂の温度を、ｔｌ！ｊ節することによ
り配向度合をａｉ４ｓｆＪすることができ、射出成形よ
り更に配向度を大きくすることができる。In a Fresnel lens having parallel VC grooves as shown in the rM5 diagram, cracking can be prevented by providing orientation in the direction 3 perpendicular to the groove direction. To provide radial orientation, the injection molded gate can be placed in the center. Generally, in injection molding, the ratio of flow distance from '7'' to wall thickness T is L/
T is often 100 or less, and when molding large molded products, multiple points 'F' are used.
”-) is often used.For Fresnel lenses with concentric grooves, even large molded products with L/T of 100 or more
Point gates are preferred. In order to give a Fresnel lens having parallel grooves a direction perpendicular to the grooves, injection molding is performed in a direction perpendicular to the grooves using a film gate from one end 4 as shown in FIG. is obtained by a method such as stretching or rolling in a direction 3 perpendicular to the groove. In order to carry out injection molding in a direction perpendicular to the grooves of the lens and to apply orientation in the direction perpendicular to the grooves, it is easier to achieve orientation when the mold cavity is thinner. It is preferable to increase the wall thickness of the mold cavity and increase the wall thickness according to the amount of resin injected.
, will be explained using FIG. The mold cavity 10 of a 7-Renel lens is kept thin by closing the mold members 11 and 12, and the synthetic resin is injected through the runner 13 and the film r-t 14 (FIG. 11, A). When the mold cavity 10 is filled with synthetic resin and injection continues, the mold material 12 retreats, expanding the mold cavity and increasing the wall thickness (No. 11).
Figure, B). By injecting into the mold cavity set to have a thin wall in this manner, the flow orientation of the final molded product becomes large even within the thickness. In this case, it is necessary to set the mold clamping force so that it is overcome by the injection pressure of the resin. Direction perpendicular to the lens groove [
Another method for applying ``at'' is to preheat a thick plate-shaped synthetic resin to a temperature above the glass transition temperature of the resin and up to the melting point, and then place it in a compression mold with a heated lens mold. It is possible to mold J's by compressing and applying orientation. The temperature of the resin is tl! The degree of orientation can be increased to ai4sfJ by forming the j section, and the degree of orientation can be made even greater than that achieved by injection molding.
合成樹脂製フレネルレンズは２ＩＩＩＩ配向させること
により強化することができる。史にレンズの鍔に対し直
円方向の配ｌｌ１ｉ］度が大きい２軸配向が好ましい。Synthetic resin Fresnel lenses can be strengthened by 2III orientation. A biaxial orientation with a large degree of orientation in a right circular direction with respect to the lens flange is preferable.
第６図Ｑ工素材５が均寺に６の位ｉまで延伸あるいはｅ
ｍ成形されるところを示す。耐７図はＡ −Ａ’刀回に
レンズの、得があ°す、レンズの４万同と直角方１ｉＴ
Ｉ Ｂ −Ｂ’の配向度が大きくなるところを示す。Ｂ
−Ｂ’カ向の配向度を大きくすることにより、酵によ
る割れを防ぐことができる。Figure 6 Q work material 5 is stretched to the 6th position i or e
m Shows how it is molded. The resistance 7 figure is A-A', the gain of the lens is 40,000 degrees, and the right angle is 1iT.
It shows that the degree of orientation of I B -B' increases. B
By increasing the degree of orientation in the -B' direction, cracking due to fermentation can be prevented.
２＠Ｊ配回された合成樹脂フレネルレンズの好マしい成
形法は、あらかじめ成形された合成樹脂２軸配向、シー
トを、該合成樹脂のガラス転移温度付近で、真空下にフ
レネルレンズの型で圧縮することにより成形できる。A preferred molding method for synthetic resin Fresnel lenses arranged in 2@J is to mold a pre-molded synthetic resin biaxially oriented sheet into a Fresnel lens mold under vacuum at around the glass transition temperature of the synthetic resin. Can be molded by compression.
合成樹脂シートの配向度合は、該シートを加熱した時に
発生する収縮力（０ｒｉｅｎｔａｔｉｏｎ Ｒｅ１ｅａ
ｓｅＳｔｒｅｓｓ、以後ＯＲ８と略称）により表示する
ことが−（−き６゜ＯＲ８＋：ｚＡｓＴＭＤ １５０４
ｔｉｔｓ ｅり方ｍテ測定することができる。２軸配
向シートでは一般にＯＲ８が大きい梶、衝撃強度は大き
くなる。ＯＥ（＋９〕大きなアクリル樹脂の２軸配向シ
ートの製法については、特願昭５４−１０５９９９（特
開昭５６−３０８０９号公報）、特願昭５ ｉ −２０
８６０（％開昭５７−１３５１１９号公＠）、％顧昭５
７−５２２８３等に示した。The degree of orientation of a synthetic resin sheet is determined by the contraction force generated when the sheet is heated.
seStress (hereinafter abbreviated as OR8) can be displayed by -(-6°OR8+:zAsTMD 1504
Tits can be measured. In general, in biaxially oriented sheets, the higher the OR8, the higher the impact strength. Regarding the manufacturing method of biaxially oriented sheet of OE (+9) large acrylic resin, please refer to Japanese Patent Application No. 54-105999 (Japanese Unexamined Patent Publication No. 56-30809), Japanese Patent Application No. 56-30809
860 (%Kaisho 57-135119 public@), %Gusho 5
7-52283 etc.
７本発明で特に好ましいフレネルレンズは、貞量平均分
子量が１００万以上の超高分量アクリル樹脂を延伸倍率
６倍以上に強力に２ｍ配向した。Ｒ８が２０ ｋｇ／
ａｎ２以上のシートから成形されたフレネルレンズであ
る。上記シートは著るしく強靭なシートであり、その衝
撃強さはポリカーボネートに匹敵する。上記シートの性
能及び製法については、ＬＰ！ｉ顧昭５７−５２２’８
３に示した。上記シートをアクリル樹脂のガラス転移温
度より若干高い温度、例えばポリメチルメタクリレート
ホモポリマーでは１１０〜１１５°Ｃで、フレネルレン
ズ金型で真壁ドにプレス１−ることによりフレネルレン
ズとすることができる。7. A particularly preferred Fresnel lens in the present invention is made of an ultra-high weight acrylic resin having an average molecular weight of 1,000,000 or more and is strongly oriented by 2 m at a stretching ratio of 6 times or more. R8 is 20 kg/
This is a Fresnel lens molded from a sheet of an2 or higher. The sheet is an extremely tough sheet, and its impact strength is comparable to that of polycarbonate. Regarding the performance and manufacturing method of the above sheet, please refer to LP! i Gusho 57-522'8
Shown in 3. A Fresnel lens can be obtained by pressing the above-mentioned sheet into a Makabe mold using a Fresnel lens mold at a temperature slightly higher than the glass transition temperature of the acrylic resin, for example, 110 to 115°C for polymethyl methacrylate homopolymer.
本発明では成形品全体に均一に配向がかか・うていなく
てもそれなりに効果があり、本発明には表層、内側に均
一に配向がかかつていない成形品も含まれる。In the present invention, even if the entire molded product is not uniformly oriented, it is still effective to some extent, and the present invention also includes molded products that are not uniformly oriented on the surface or inside.
本発明のフレネルレンズはこれまで）ｆｚした様に合成
樹脂の射出成形、圧編成形寺の方法で成形できる。しか
し大型の７レネルレンズを成形する場合、大型の金型と
大型の成形機を心安とする。大□１場光線を集熱してエ
ネルギーを採果する様な場合大型の７レネルレンズが好
ましく、ごの様な大型の７レネルレンズ？一つの金型で
成形することは装、ｉｔ費が高くなる。この様な場合、
フレネルレンズの一部を成形し、該フレネルレンズの一
部ヲ２つ以上組合せることによりフレネルレンズトシテ
機能させることが好ましい。本発明ではこの様なフレネ
ルレンズの一部を提供する。第８図、第９図、第１０図
により説明する。Ｍ８図に示す点薬点型フレネルレンズ
の１／、（７）を４つ組合せ一つのフレネルレンズとす
る。第９図に示す様に１／２（８）を２つ組合せること
もできる。第１０図に示す線焦点型フレネルレンズでは
ｌ／２（９）を２つ組合せることができる。The Fresnel lens of the present invention can be molded by injection molding of synthetic resin or pressing molding method as previously described. However, when molding a large 7-lens lens, a large mold and a large molding machine are necessary. Large □1 If you want to collect energy by collecting heat from a field ray, a large 7 renel lens is preferable, and a large 7 renel lens like this one? Molding with one mold increases equipment and IT costs. In such a case,
It is preferable to mold a part of the Fresnel lens and combine two or more parts of the Fresnel lens to function as a Fresnel lens. The present invention provides a part of such a Fresnel lens. This will be explained with reference to FIGS. 8, 9, and 10. One Fresnel lens is made by combining four 1/(7) droplet type Fresnel lenses shown in Figure M8. It is also possible to combine two 1/2 (8) as shown in FIG. In the line focusing type Fresnel lens shown in FIG. 10, two l/2(9) lenses can be combined.
本発明のフレネルレンズは、太陽熱コレクター等の部品
゛に良好に１史用できる。The Fresnel lens of the present invention can be used satisfactorily in parts such as solar collectors.
本ｉ明のフレネルレンズは肉厚が薄い時に特にその効果
が大きく、一般には１關以上５關以下である。The effect of the Fresnel lens of the present invention is particularly large when the wall thickness is thin, and generally the thickness is 1 or more and 5 or less.
実施例
特願昭５７−５２２８５に示した方法により成形した延
伸倍率（面積比）５倍、ＯＲ８２５ｋｇ／ｃｍ２で４
ｍｇ＋厚の２軸配向アクリルシート（、！敏平均分子遺
４７０万のポリメチルメタクリレート）と、ｉｔ平均分
子遺１００万のポリメチルメタクリレートの４ ＋ｕ＋
厚無厚肉配向クリルシートを用いてフレネルレンズを成
形し、衝撃強度を比較した。フレネルレンズの１成形は
、上記シートを９０℃に予熱した後、１１５℃に加熱し
たフレネルレンズ金型にはさみ、真空下に尚圧力で圧縮
し、１１ちに金型を冷却して耐却固化されたフレネルレ
ンズを得た。谷レンズに、レンズ溝の反対１１Ｊ面方向
から、ηインチ牛僅のミサイルｖ１ｍｍさより自゛然洛
下させて、破壊エネルギーをＩＩＩＩＪ定した。無配向
レンズの破壊エネルギーは１０す・口であった。しかし
２軸配向レンズの破壊エネルギーは１８０ゆ・傭であり
、者るしく強靭なものであった。Example Molded by the method shown in Japanese Patent Application No. 57-52285 at a stretching ratio (area ratio) of 5 times and an OR of 825 kg/cm2.
mg+ thick biaxially oriented acrylic sheet (polymethyl methacrylate with an average molecular weight of 4.7 million) and polymethyl methacrylate with an average molecular weight of 1 million 4+u+
Fresnel lenses were molded using thick and non-thick oriented kryl sheets, and the impact strength was compared. 1 molding of a Fresnel lens involves preheating the above sheet to 90°C, then inserting it into a Fresnel lens mold heated to 115°C, compressing it under pressure under vacuum, and then immediately cooling the mold to solidify it. obtained a Fresnel lens. The destructive energy was determined by allowing the valley lens to fly down from the 11J plane opposite to the lens groove from a distance of η inches (v1 mm). The fracture energy of the non-oriented lens was 10 mm. However, the fracture energy of the biaxially oriented lens was 180 yen, making it impressively strong.
実施例２
射出成形により、フレネルレンズを成−形した。アクリ
ル樹脂としてデルペット８ＯＮ（旭化成工業Ｃ株）装）
〜を用い、樹脂温度２４０℃、金型温間１５′Ｇで、４
１厚の線焦点フレネルレンズを射出成形した。第１１図
に示した様に、レンズ４に直角方間に樹脂餐流動させて
、溝と直角方向に配向させたレンズと、中央ゲートから
樹脂なｉ出して溝と平行方向の配向も何するレンズを成
形し、実゛施例１と同様に破壊エネルギーを測定した。Example 2 A Fresnel lens was molded by injection molding. Delpet 8ON (Asahi Kasei Kogyo C Co., Ltd.) as acrylic resin)
Using ~, resin temperature 240℃, mold warm 15'G, 4
A 1-thick line-focus Fresnel lens was injection molded. As shown in Fig. 11, the resin is flowed perpendicularly to the lens 4, and the lens is oriented in the direction perpendicular to the groove, and the resin is poured out from the center gate and oriented in the direction parallel to the groove. A lens was molded and the fracture energy was measured in the same manner as in Example 1.
鍔と平行方向の配同部の破壊エネルギーは５ゆ・αであ
り、溝と直角方向に配向させたレンズの破壊エネルギー
は２５ｋｇ・傭であったｇThe fracture energy of the alignment part parallel to the brim was 5 kg·α, and the fracture energy of the lens oriented perpendicular to the groove was 25 kg·αg.
第１図は同心円状に溝を有する７レネルレンズの平面図
、Ｍ２図は平行状に溝を有するフレネルレンズの平面図
、第６図はフレネルレンズの断面図を示す。
第４図、第５図はレンズの溝方向にほぼ直角の方向の樹
脂配回を有する７レネルレンズの平面図。
第６図、第７図は２軸延伸する経過を示す坪′面図、
嬉８図、Ｍ９図、第１０図は７レネルレンズの一部を組
合せて一つのフレネルレンズにした場合の平面図をそれ
′ぞれ示す。
第１１図（Ａ）は薄肉キャビティ状聴を示す射出成形用
金型の＠断面図、＃１１１図（Ｂ）は型キャビ、ティが
肉厚状轢になった金型の１１１断面図を示す。
１・・・７レネルレンズの溝
２．３・・・樹脂配向（矢印で示す）
５・・・樹脂素材
６・・・延伸された素材
１０・・・型キャピテイ
１２・・・型材
１４・・・フィルムゲート
特許比−人 旭化成工業株式会社
第１ＷＪ 第２１１
第３ａｉ１
第６Ｒ
第８図 １１！；９１１
第１１１！
（Ａ）
３
（Ｂ）FIG. 1 is a plan view of a 7-Resnel lens having concentric grooves, FIG. M2 is a plan view of a Fresnel lens having parallel grooves, and FIG. 6 is a cross-sectional view of the Fresnel lens. FIGS. 4 and 5 are plan views of a 7-Renel lens having resin distribution in a direction substantially perpendicular to the groove direction of the lens. Figures 6 and 7 are cross-sectional views showing the progress of biaxial stretching, and Figures 8, M9, and 10 are plan views when parts of 7 Renel lenses are combined to form one Fresnel lens. Each is shown below. Figure 11 (A) is a cross-sectional view of an injection mold showing a thin cavity, and Figure #111 (B) is a cross-sectional view of a mold in which the mold cavity and tee are thick-walled. . 1...7 Groove of Renel lens 2.3...Resin orientation (indicated by arrow) 5...Resin material 6...Stretched material 10...Mold cavity 12...Mold material 14... Film gate patent ratio - person Asahi Kasei Corporation 1st WJ 211th 3ai1 6R Fig. 8 11! ;911 111th! (A) 3 (B)
Claims (1)
ンズ ２．７レネルレンズの溝方向とははｔｌｊ角方向に１軸
配向された特許請求の範−第（１）項記載のレンズ３、
２ｍ＆向さｈた％ＦＲｍ 、ｆ ノｍ囲第（１）項記
載のレンズ ４、合成樹脂がアクリル樹脂である特許請求の帷ｖＭ第
（１）項、第（２）項又は第（３）項記載のレンズ５、
′を敏平均分子縦が１００万以上の縮＾分子履アクリル
樹脂をｔ押漬率３倍以上に強力に２軸配向したＯＲ８が
２０ゆ７１２以上のシートから成形された特Ｉｌｆ請求
の軸囲剃３）項又は第（４）項記載のレンズ[Scope of Claims] 1. Synthetic resin Fresnel lens reinforced by resin orientation 2.7 The groove direction of the Fresnel lens is uniaxially oriented in the tlj angle direction. lens 3,
2 m & facing h % FRm, f Nom Lens 4 as described in Section (1), patent claim sheet vM Section (1), (2) or (3) in which the synthetic resin is an acrylic resin Lens 5 described in section 5,
A special Ilf-claimed shaft circumference formed from a sheet of acrylic resin with an average molecular length of 1 million or more and strongly biaxially oriented with an OR8 of 20 to 712 or more at a pressing rate of 3 times or more. Lenses described in item 3) or item (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1150783A JPS59137902A (en) | 1983-01-28 | 1983-01-28 | Fresnel lens made of plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1150783A JPS59137902A (en) | 1983-01-28 | 1983-01-28 | Fresnel lens made of plastic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59137902A true JPS59137902A (en) | 1984-08-08 |
| JPH0376212B2 JPH0376212B2 (en) | 1991-12-04 |
Family
ID=11779930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1150783A Granted JPS59137902A (en) | 1983-01-28 | 1983-01-28 | Fresnel lens made of plastic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59137902A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56159127A (en) * | 1980-05-12 | 1981-12-08 | Dainippon Printing Co Ltd | Manufacture of fresnel lens |
| JPS5749527A (en) * | 1980-09-10 | 1982-03-23 | Japan Atom Energy Res Inst | Manufacture of fresnel lens |
| JPS57109618A (en) * | 1980-12-27 | 1982-07-08 | Dainippon Printing Co Ltd | Both faces fresnel lens and its manufacture |
-
1983
- 1983-01-28 JP JP1150783A patent/JPS59137902A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56159127A (en) * | 1980-05-12 | 1981-12-08 | Dainippon Printing Co Ltd | Manufacture of fresnel lens |
| JPS5749527A (en) * | 1980-09-10 | 1982-03-23 | Japan Atom Energy Res Inst | Manufacture of fresnel lens |
| JPS57109618A (en) * | 1980-12-27 | 1982-07-08 | Dainippon Printing Co Ltd | Both faces fresnel lens and its manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0376212B2 (en) | 1991-12-04 |
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