JP2838514B2 - Method for producing convex lens-shaped polarizing plate for glasses - Google Patents
Method for producing convex lens-shaped polarizing plate for glassesInfo
- Publication number
- JP2838514B2 JP2838514B2 JP8133389A JP13338996A JP2838514B2 JP 2838514 B2 JP2838514 B2 JP 2838514B2 JP 8133389 A JP8133389 A JP 8133389A JP 13338996 A JP13338996 A JP 13338996A JP 2838514 B2 JP2838514 B2 JP 2838514B2
- Authority
- JP
- Japan
- Prior art keywords
- polycarbonate resin
- polarizing plate
- convex lens
- resin sheet
- speed
- 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.)
- Expired - Lifetime
Links
Landscapes
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、偏光メガネやゴー
グルに用いられるメガネ用凸レンズ状偏光板の製造方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a convex lens-like polarizing plate for eyeglasses used for polarized eyeglasses and goggles.
【０００２】なお、この明細書において、ポリカーボネ
ート樹脂シートとは、ポリカーボネート樹脂シートのみ
ならず、同樹脂フィルムを含んで意味するものとする。[0002] In this specification, the polycarbonate resin sheet means not only the polycarbonate resin sheet but also the same resin film.
【０００３】[0003]
【従来の技術】従来、この種の偏光板の表面保護層とし
て、ポリカーボネート樹脂シートを用いることは、既に
知られている。これは、ポリカーボネート樹脂シートが
すぐれた透明性、耐熱性、耐衝撃性などを有するためで
ある。2. Description of the Related Art Conventionally, it has been already known to use a polycarbonate resin sheet as a surface protective layer of this type of polarizing plate. This is because the polycarbonate resin sheet has excellent transparency, heat resistance, impact resistance, and the like.
【０００４】このようなポリカーボネート樹脂シート
は、従来、例えば樹脂原料を溶融状態でＴダイより押し
出し、ロールにより引き取るＴダイ押出し法により一般
に製造されていた。従来のポリカーボネート樹脂シート
の厚さは０．４〜１．０mm程度であるが、シート内部に
製造時に生じた歪みが残留したまゝであり、例えばシー
トの厚さを０．７mm程度とした場合、そのリターデーシ
ョン値（複屈折位相差値）が、約１００〜８００nm程度
であった。Conventionally, such a polycarbonate resin sheet has been generally manufactured by, for example, a T-die extrusion method in which a resin raw material is extruded from a T-die in a molten state and is taken up by a roll. The thickness of the conventional polycarbonate resin sheet is about 0.4 to 1.0 mm, but the strain generated during manufacturing remains inside the sheet, for example, when the sheet thickness is about 0.7 mm And its retardation value (birefringence retardation value) was about 100 to 800 nm.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うなリタデーション値を有するポリカーボネート樹脂シ
ートを表面保護層として用いた偏光板は、複屈折による
色付き現象によって虹色の色むらが現れて見え、非常に
外観が悪く、この偏光板を、偏光メガネやゴーグルに用
いるために、凸レンズ状に曲面加工すると、さらに歪み
が増大し、このような曲面状の偏光板を斜め方向から見
た場合には虹色の色むらとして著しく観察され、外観
上、非常に体裁が悪いという問題があった。However, a polarizing plate using a polycarbonate resin sheet having such a retardation value as a surface protective layer appears rainbow-like color unevenness due to coloring due to birefringence. The appearance is poor, and when this polarizing plate is used for polarizing glasses and goggles, if it is curved into a convex lens shape, the distortion will further increase, and if such a curved polarizing plate is viewed from an oblique direction, it will be rainbow-colored. There was a problem that the color unevenness was remarkably observed, and the appearance was very poor.
【０００６】そこで、本発明者らは、上記の点に鑑み
て、鋭意研究を重ねた結果、高いリタデーション値を有
するポリカーボネート樹脂シート、とりわけ特定の製造
法によりつくられた高いリタデーション値を有するポリ
カーボネート樹脂シートを、偏光フィルムの表面保護層
として用いた偏光板は、複屈折による色付き現象が生じ
難いことを見出し、本発明を完成するに至った。In view of the above points, the present inventors have conducted intensive studies and as a result, have found that polycarbonate resin sheets having a high retardation value, especially polycarbonate resin sheets having a high retardation value, which are produced by a specific production method. The present inventors have found that a polarizing plate using a sheet as a surface protective layer of a polarizing film hardly causes a coloring phenomenon due to birefringence, and completed the present invention.
【０００７】本発明の目的は、上記の従来技術の問題を
解決し、複屈折による虹色の色むらが全く観察されず、
かつ曲面加工を施した場合にも色むらが現れず、耐衝撃
性および耐熱性などにおいてすぐれた品質を有しかつ外
観のきれいな偏光メガネやゴーグルを市場に供給し得
る、メガネ用凸レンズ状偏光板の製造方法を提供しよう
とするにある。An object of the present invention is to solve the above-mentioned problems of the prior art, and no rainbow color unevenness due to birefringence is observed.
A convex lens-shaped polarizing plate for eyeglasses that does not show color unevenness even when subjected to a curved surface processing, has excellent quality in impact resistance and heat resistance, and can supply polarizing glasses and goggles with beautiful appearance to the market. To provide a manufacturing method.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明によるメガネ用凸レンズ状偏光板の製造方
法は、偏光フイルムの少なくとも片面に、Ｔダイ押出し
法による製造の際に最終の冷却ロールの速度（Ｓ 1 ）よ
りも引取りロールの速度（Ｓ 2 ）を大きくして、両ロー
ルの速度比：Ｓ 2 ／Ｓ 1 として定義される引取り比が
１．２３〜１．４０の範囲で引き取ることにより、複屈
折率を増加させ、かつその複屈折率（Δｎ）と厚み
（ｄ）の積で定義されるリタデーション値（Δｎ・ｄ）
３０００〜６０００nmを有するポリカーボネート樹脂シ
ートを積層し、曲面加工を施すことを特徴とするもので
ある。In order to achieve the above-mentioned object, a method for producing a convex lens-like polarizing plate for eyeglasses according to the present invention comprises the steps of: velocity of the cooling roll (S 1) take-up roll speed than the (S 2) by increasing both the low
Speed ratio of Le: taking ratio defined as S 2 / S 1 is
By taking in the range of 1.23 to 1.40 , the birefringence is increased, and the retardation value (Δn · d) defined by the product of the birefringence (Δn) and the thickness (d)
A polycarbonate resin sheet having a thickness of 3000 to 6000 nm is laminated and subjected to a curved surface processing.
【０００９】上記において、偏光フイルムとしては、ポ
リビニルアルコールまたはその誘導体からなるフィルム
を一軸に延伸配向させ、偏光素子としてヨウ素や二色性
染料を吸着させた、ヨウ素／ＰＶＡ系あるいは二色性染
料／ＰＶＡ系の偏光フイルムなどを使用する。In the above, as the polarizing film, a film made of polyvinyl alcohol or a derivative thereof is uniaxially stretched and oriented, and as a polarizing element, iodine or a dichroic dye is adsorbed. A PVA-based polarizing film or the like is used.
【００１０】そして、この偏光フイルムの片面または両
面に積層するポリカーボネート樹脂シートは、上記リタ
デーション値（Δｎ・ｄ）が３０００〜６０００nm、好
ましくは３４００〜６０００nmを有するものである。The polycarbonate resin sheet laminated on one or both sides of the polarizing film has a retardation value (Δnd) of 3000 to 6000 nm, preferably 3400 to 6000 nm.
【００１１】ここで、ポリカーボネート樹脂シートのリ
タデーション値が３０００nm未満では、製造時に生じた
歪みが該シートに残留しており、例えばこのシートを２
枚のテスト用偏光板に挾んで見ると、複屈折による色付
きが顕著である。またリタデーション値が６０００nmを
越えるポリカーボネート樹脂シートは、製造時の延伸の
さいに破断が生じやすくなるので、好ましくない。Here, when the retardation value of the polycarbonate resin sheet is less than 3000 nm, the strain generated during the production remains on the sheet.
When viewed between two test polarizing plates, coloring due to birefringence is remarkable. Further, a polycarbonate resin sheet having a retardation value of more than 6000 nm is not preferred because breakage is likely to occur during stretching during production.
【００１２】上記ポリカーボネート樹脂シートとして
は、通常、ビスフエノール骨格を有する芳香族ポリカー
ボネート樹脂よりなるシートを用いるが、その他、芳香
族ポリカーボネート樹脂系共重合体、さらにはポリカー
ボネート樹脂またはその共重合体に、他の透明樹脂をブ
レンドした樹脂よりなるシートなどを用いることも可能
である。As the above-mentioned polycarbonate resin sheet, a sheet made of an aromatic polycarbonate resin having a bisphenol skeleton is usually used. In addition, an aromatic polycarbonate resin-based copolymer, and further, a polycarbonate resin or a copolymer thereof may be used. It is also possible to use a sheet made of a resin blended with another transparent resin.
【００１３】また、ポリカーボネート樹脂シートは、紫
外線（ＵＶ）処理、プラズマ処理、防曇処理、ハードコ
ート処理などの表面処理を施したものを使用しても、勿
論良い。[0013] The polycarbonate resin sheet may be subjected to a surface treatment such as an ultraviolet (UV) treatment, a plasma treatment, an anti-fog treatment and a hard coat treatment.
【００１４】[0014]
【発明の実施の形態】つぎに、本発明の実施の形態を、
図面を参照して説明する。Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings.
【００１５】図１と図２を参照すると、本発明によるメ
ガネ用凸レンズ状偏光板(4) の製造方法は、偏光フイル
ム(2) の少なくとも片面に、Ｔダイ押出し法による製造
の際に冷却ロールの速度よりも引取りロールの速度を大
きくして引き取ることにより、複屈折率を増加させ、か
つその複屈折率（Δｎ）と厚み（ｄ）の積で定義される
リタデーション値（Δｎ・ｄ）３０００〜６０００nmを
有するポリカーボネート樹脂シート(3) を積層し、曲面
加工を施すものである。Referring to FIGS. 1 and 2, a method for producing a convex lens-like polarizing plate for eyeglasses (4) according to the present invention is described in which at least one side of a polarizing film (2) is cooled by a cooling roll when produced by a T-die extrusion method. By increasing the speed of the take-off roll to take up the speed, the birefringence is increased, and the retardation value (Δn · d) defined by the product of the birefringence (Δn) and the thickness (d) A polycarbonate resin sheet (3) having a thickness of 3000 to 6000 nm is laminated and subjected to a curved surface processing.
【００１６】ここで、上記のような特定の高いリタデー
ション値を有するポリカーボネート樹脂シート(3) を製
造するには、図３に示すように、Ｔダイ押出し法によっ
てポリカーボネート樹脂シートを製造する際に、最終の
冷却ロール(15)の速度（Ｓ 1 ）よりも引取りロール(16)
の速度（Ｓ 2 ）を大きくして引き取り、複屈折率を増加
させて、リタデーション値を大きくさせる方法を実施す
るものであるが、この場合、最終の冷却ロール(15)の速
度（Ｓ 1 ）と引取りロールの速度（Ｓ 2 ）の比：Ｓ 2 ／
Ｓ 1 として定義される引取り比が１．２３〜１．４０の
範囲でポリカーボネート樹脂シートを引き取るものであ
る。 Here, in order to produce a polycarbonate resin sheet (3) having a specific high retardation value as described above, as shown in FIG. 3, when producing a polycarbonate resin sheet by a T-die extrusion method, the speed of the final cooling roll (15) (S 1) take-off roll than (16)
In this method, the speed (S 2 ) of the cooling roller (15) is increased to increase the birefringence, thereby increasing the retardation value . In this case, the speed of the final cooling roll (15) is increased.
Ratio of the degree (S 1 ) and the speed of the take-up roll (S 2 ): S 2 /
Taking ratio defined as S 1 is a 1.23 to 1.40
To take out the polycarbonate resin sheet within the range
You.
【００１７】また、上記偏光フィルム(2) の少なくとも
片面に、表面保護層としてのポリカーボネート樹脂シー
ト(3) を貼り合わせるために用いる接着剤は、エポキシ
系、イソシアネート硬化ウレタン系などが使用可能であ
り、すぐれた透明性と接着性を有するものであれば良
く、またポリカーボネート樹脂シートの種類によって限
定されるものではない。The adhesive used for bonding the polycarbonate resin sheet (3) as a surface protective layer to at least one surface of the polarizing film (2) may be an epoxy-based or isocyanate-cured urethane-based adhesive. What is necessary is just to have excellent transparency and adhesiveness, and it is not limited by the kind of the polycarbonate resin sheet.
【００１８】さらに、曲面加工を施すには、上記偏光板
を円形に切り出し、例えば圧空成形により凸レンズ状に
曲面加工し、メガネ用凸レンズ状偏光板を得るものであ
る。Further, in order to perform a curved surface processing, the polarizing plate is cut out into a circular shape, and the curved surface is processed into a convex lens shape by, for example, pressure molding to obtain a convex lens-shaped polarizing plate for glasses.
【００１９】なおここで、メガネ用凸レンズ状偏光板と
は、偏光メガネおよびゴーグルに用いられる凸レンズ状
偏光板を意味するものとする。Here, the convex lens-like polarizing plate for glasses means a convex lens-like polarizing plate used for polarizing glasses and goggles.
【００２０】[0020]
【実施例】つぎに、本発明の実施例を図面に基づいて詳
しく説明する。Next, embodiments of the present invention will be described in detail with reference to the drawings.
【００２１】図１に示すように、偏光板(1) は、偏光フ
イルム(2) の両面に、複屈折率（Δｎ）と厚み（ｄ）の
積で定義されるリタデーション値（Δｎ・ｄ）３０００
〜６０００nm以上を有するポリカーボネート樹脂シート
(3)(3)を積層したものである。As shown in FIG. 1, a polarizing plate (1) is provided on both sides of a polarizing film (2) with a retardation value (.DELTA.nd) defined by a product of a birefringence (.DELTA.n) and a thickness (d). 3000
Polycarbonate resin sheet having up to 6000 nm or more
(3) A laminate of (3).
【００２２】図２は、上記偏光板(1) を、偏光メガネや
ゴーグルに用いるために、凸レンズ状に曲面加工したメ
ガネ用凸レンズ状偏光板(4) を示しており、同図におい
て上記図１の場合と同一のものには、同一の符号を付し
た。FIG. 2 shows a convex lens-shaped polarizing plate (4) for eyeglasses in which the polarizing plate (1) is curved into a convex lens shape for use in polarized glasses or goggles. The same parts as in the case of are denoted by the same reference numerals.
【００２３】また、ポリカーボネート樹脂シート(3)
は、例えば図３に示すように、ポリカーボネート樹脂原
料を溶融状態でＴダイ(10)を通して押し出し、樹脂原料
シート(3a)を４本の冷却ロール(12)(13)(14)(15)によっ
て冷却し、シート(3a)の表面温度を均一なものとしつつ
延伸して、引取りロール(16)に引き取ることにより、製
造したものである。Also, a polycarbonate resin sheet (3)
For example, as shown in FIG. 3, a polycarbonate resin raw material is extruded through a T-die (10) in a molten state, and a resin raw material sheet (3a) is extruded by four cooling rolls (12) (13) (14) (15). The sheet (3a) is manufactured by cooling, stretching while keeping the surface temperature of the sheet (3a) uniform, and drawing the sheet (3a) by a take-up roll (16).
【００２４】なおここで、ポリカーボネート樹脂シート
(3) の引取り比は、最終の冷却ロール(15)の速度
（Ｓ 1 ）と、引取りロール(16)の速度（Ｓ 2 ）との比：
Ｓ2 ／Ｓ1として定義される。Here, the polycarbonate resin sheet
The take-off ratio in (3) is the speed of the final cooling roll (15).
Ratio between (S 1 ) and speed (S 2 ) of take-off roll (16):
Is defined as S 2 / S 1.
【００２５】性能評価試験 つぎに、上記偏光板(1) の性能を評価するために、ポリ
カーボネート樹脂原料（商品名ユーピロン、三菱瓦斯化
学株式会社製）を溶融状態でＴダイ(10)を通して押し出
し、周速が種々に異なる最終冷却ロール(15)および引取
りロール(16)を用いて、延伸比率の異なる厚さ０．７mm
の各種のポリカーボネート樹脂シートを作成し、各シー
トのリタデーション値（Δｎ・ｄ）を測定した。またそ
のときのシートの引取り比をあわせて測定した。Performance Evaluation Test Next, in order to evaluate the performance of the polarizing plate (1), a polycarbonate resin raw material (trade name: Iupilon, manufactured by Mitsubishi Gas Chemical Co., Ltd.) was extruded in a molten state through a T-die (10). Using a final cooling roll (15) and a take-up roll (16) whose peripheral speeds are variously different, a thickness of 0.7 mm having a different stretching ratio.
Were prepared, and the retardation value (Δnd) of each sheet was measured. Further, the sheet take-up ratio at that time was also measured.
【００２６】ついで、これらのシートを、ヨウ素／ＰＶ
Ａ系偏光フイルム(2) の両面に、エポキシ系接着剤を介
して積層して、各種の偏光板を製造し、得られた各偏光
板を肉眼で斜め方向から見て、色むらの有無を観察し、
その性能を評価した。得られた結果を下記表１にまとめ
て示した。Next, these sheets were treated with iodine / PV.
Various polarizing plates are manufactured by laminating on both sides of the A-type polarizing film (2) via an epoxy-based adhesive, and each obtained polarizing plate is viewed obliquely with the naked eye to check for color unevenness. Observe,
Its performance was evaluated. The results obtained are summarized in Table 1 below.
【００２７】なお、この表１においては、色むらが認め
られるものを×、色むらが若干認められるものを△、色
むらが全く認められないものを○として表わした。In Table 1, X indicates that color unevenness was observed, Δ indicates that slight color unevenness was observed, and ○ indicates that no color unevenness was observed.
【００２８】また表１には、各ポリカーボネート樹脂シ
ートの引取り比：Ｓ2 ／Ｓ1 、およびシートの延伸方向
に垂直な方向の平均値として計算した、同シートのリタ
デーション値（Δｎ・ｄ）をあわせて示した。Table 1 shows the take-up ratio: S 2 / S 1 of each polycarbonate resin sheet, and the retardation value (Δn · d) of the same sheet calculated as an average value in the direction perpendicular to the stretching direction of the sheet. Are also shown.
【００２９】[0029]
【表１】 上記表１から明らかなように、本発明による実施例１〜
３の偏光板(1) は、ロール成形による歪むらに起因する
色むらは全く観察されなかった。[Table 1] As is clear from Table 1 above, Examples 1 to 5 according to the present invention were used.
In the polarizing plate (1) No. 3, no color unevenness due to distortion unevenness due to roll forming was observed at all.
【００３０】これに対し、比較例１および２の偏光板で
は、ロール成形時の歪むらが著しい色むらとして観察さ
れ、また比較例３の偏光板では、ロール成形による歪む
らに起因する色むらがわずかに観察された。On the other hand, in the polarizing plates of Comparative Examples 1 and 2, distortion unevenness during roll forming was observed as remarkable color unevenness, and in the polarizing plate of Comparative Example 3, color unevenness caused by distortion unevenness due to roll forming was observed. Was slightly observed.
【００３１】なお、実施例１〜３の偏光板(1) の表面保
護層を構成するリタデーション値３０００nm以上のポリ
カーボネート樹脂シート(3) を、２枚のテスト用偏光板
の間に挾んで見ると、歪むらはほとんど観察されなかっ
た。When the polycarbonate resin sheet (3) having a retardation value of 3000 nm or more and constituting the surface protective layer of the polarizing plates (1) of Examples 1 to 3 was sandwiched between two test polarizing plates, the distortion was found. Irregularities were hardly observed.
【００３２】これに対し、比較例１〜３の偏光板に用い
たリタデーション値が３０００nm未満のポリカーボネー
ト樹脂シートを、２枚のテスト用偏光板の間に挾んで見
ると、著しい歪むらが観察された。同表から明らかなよ
うに、本発明による実施例１〜３の偏光板(1) に用いた
ポリカーボネート樹脂シート(3) は、Ｔダイ押出し法に
よって製造する際に、最終の冷却ロール(15)の速度（Ｓ
1 ）よりも引取りロール(16)の速度（Ｓ 2 ）を大きくし
て引き取り、複屈折率を増加させて、リタデーション値
を大きくさせる方法により製造されたもので、この場
合、最終の冷却ロール(15)の速度（Ｓ 1 ）と引取りロー
ルの速度（Ｓ 2 ）の比：Ｓ 2 ／Ｓ 1 として定義される引
取り比が１．２３〜１．４０の範囲で引き取られたもの
が、所期のリタデーション値を有しているものであるこ
とが分る。 In contrast, when the polycarbonate resin sheet having a retardation value of less than 3000 nm used for the polarizing plates of Comparative Examples 1 to 3 was sandwiched between two test polarizing plates, remarkable distortion unevenness was observed. It is clear from the table
As described above, it was used for the polarizing plates (1) of Examples 1 to 3 according to the present invention.
Polycarbonate resin sheet (3) is extruded by T-die extrusion
Therefore, at the time of manufacture, the speed of the final cooling roll (15) (S
Increase the speed (S 2 ) of the take-off roll (16) from 1 )
To increase the birefringence and increase the retardation value
It is manufactured by a method to increase
If the final cooling roll (15) speed (S 1 ) and take-off roll
The ratio of the speed of le (S 2): argument defined as S 2 / S 1
Items with a take ratio of 1.23 to 1.40
Must have the expected retardation value.
I understand.
【００３３】さらに、上記実施例１〜３の偏光板(1)
と、比較例１〜３の偏光板とを、それぞれ円形に切り出
し、圧空成形により、図２に示すような凸レンズ状に曲
面加工し、得られた凸レンズ状偏光板(4) を斜め方向か
ら見たところ、比較例１〜３の偏光板では、曲面加工に
よってシートの歪みがさらに増大し、虹色の著しい色む
らが観察されたが、実施例１〜３の偏光板(1) では、曲
面加工によっても歪みが増大することなく、得られた凸
レンズ状偏光板(4) には、色むらは全く観察されなかっ
た。Further, the polarizing plates (1) of Examples 1 to 3 were used.
And each of the polarizing plates of Comparative Examples 1 to 3 was cut out into a circular shape, and the surface was processed into a convex lens shape as shown in FIG. 2 by air pressure molding, and the obtained convex lens-shaped polarizing plate (4) was viewed obliquely. Then, in the polarizing plates of Comparative Examples 1 to 3, the distortion of the sheet was further increased by the curved surface processing, and remarkable rainbow-like color unevenness was observed. However, in the polarizing plates (1) of Examples 1 to 3, the curved surface was No color unevenness was observed in the obtained convex lens-shaped polarizing plate (4) without increasing the distortion even by the processing.
【００３４】[0034]
【発明の効果】本発明によるメガネ用凸レンズ状偏光板
の製造方法は、上述のように、偏光フイルムの少なくと
も片面に、複屈折率（Δｎ）と厚み（ｄ）の積で定義さ
れるリタデーション値（Δｎ・ｄ）３０００〜６０００
nmを有するポリカーボネート樹脂シートを積層し、曲面
加工を施すことを特徴とするもので、とくにポリカーボ
ネート樹脂シートとして、Ｔダイ押出し法による製造の
際に最終の冷却ロールの速度（Ｓ 1 ）よりも引取りロー
ルの速度（Ｓ 2 ）を大きくして、両ロールの速度比：Ｓ
2 ／Ｓ 1 として定義される引取り比が１．２３〜１．４
０の範囲で引き取ることにより、複屈折率を増加させた
シートを用いているから、リタデーション値（Δｎ・
ｄ）３０００〜６０００nmを有するポリカーボネート樹
脂シートを非常に安定して製造し得るとともに、曲面加
工を有利に実施することができて、該曲面加工によって
も歪みが増大することなく、本発明の方法により製造さ
れたメガネ用凸レンズ状偏光板は、複屈折による虹色の
色むらが全く観察されず、非常にすぐれた品質を有して
おり、かつ外観がきれいであるため、偏光メガネやゴー
グルに好適に使用することができ、耐衝撃性および耐熱
性などにおいてすぐれた品質を有しかつ外観のきれいな
偏光メガネやゴーグルを市場に安定的に供給し得るとい
う効果を奏する。According to the method for producing a convex lens-like polarizing plate for eyeglasses of the present invention, as described above, at least one side of a polarizing film has a retardation value defined by a product of a birefringence (Δn) and a thickness (d). (Δnd) 3000 to 6000
It is characterized by laminating a polycarbonate resin sheet having a thickness of nm and performing a curved surface processing. In particular, as a polycarbonate resin sheet, when manufacturing by a T-die extrusion method, the speed is lower than the final cooling roll speed (S 1 ). The speed (S 2 ) of the take-up roll is increased, and the speed ratio of both rolls: S
Taking ratio defined as 2 / S 1 is from 1.23 to 1.4
Since the sheet having an increased birefringence is used by taking in the range of 0 , the retardation value (Δn ·
d) The polycarbonate resin sheet having a thickness of 3000 to 6000 nm can be manufactured very stably, and the curved surface processing can be advantageously performed, and the distortion of the curved surface processing does not increase. The manufactured convex lens-shaped polarizing plate for eyeglasses has no rainbow color unevenness due to birefringence, has excellent quality, and has a beautiful appearance, so it is suitable for polarized eyeglasses and goggles. It is possible to stably supply polarized glasses and goggles having excellent quality in impact resistance and heat resistance and having a beautiful appearance to the market.
【００３５】４．図面の簡単な説明4. BRIEF DESCRIPTION OF THE FIGURES
【図１】本発明の実施例に用いる偏光板の要部拡大断面
図である。FIG. 1 is an enlarged sectional view of a main part of a polarizing plate used in an embodiment of the present invention.
【図２】本発明の方法により得られた偏光メガネやゴー
グルに用いる凸レンズ状偏光板の縦断面図である。FIG. 2 is a longitudinal sectional view of a convex lens-like polarizing plate used for polarizing glasses and goggles obtained by the method of the present invention.
【図３】ポリカーボネート樹脂シートの製造装置の概略
を示す縦断面図である。FIG. 3 is a longitudinal sectional view schematically showing a manufacturing apparatus of a polycarbonate resin sheet.
１ 偏光板 ２ 偏光フィルム ３ ポリカーボネート樹脂シート ４ メガネ用凸レンズ状偏光板 １０ Ｔダイ １２ 冷却ロール １３ 冷却ロール １４ 冷却ロール １５ 冷却ロール １６ 引取りロール DESCRIPTION OF SYMBOLS 1 Polarizing plate 2 Polarizing film 3 Polycarbonate resin sheet 4 Convex lens-shaped polarizing plate for glasses 10 T-die 12 Cooling roll 13 Cooling roll 14 Cooling roll 15 Cooling roll 16 Take-up roll
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G02B 5/30 G02C 1/00 - 13/00Continuation of the front page (58) Field surveyed (Int.Cl. 6 , DB name) G02B 5/30 G02C 1/00-13/00
Claims (1)
Ｔダイ押出し法による製造の際に最終の冷却ロールの速
度（Ｓ 1 ）よりも引取りロールの速度（Ｓ 2 ）を大きく
して、両ロールの速度比：Ｓ 2 ／Ｓ 1 として定義される
引取り比が１．２３〜１．４０の範囲で引き取ることに
より、複屈折率を増加させ、かつその複屈折率（Δｎ）
と厚み（ｄ）の積で定義されるリタデーション値（Δｎ
・ｄ）３０００〜６０００nmを有するポリカーボネート
樹脂シート(3) を積層し、曲面加工を施すことを特徴と
する、メガネ用凸レンズ状偏光板の製造方法。1. A polarizing film (2) on at least one side thereof,
The speed of the take-off roll (S 2 ) is made larger than the speed of the final cooling roll (S 1 ) during the production by the T-die extrusion method , and the speed ratio of both rolls is defined as S 2 / S 1.
The birefringence is increased and the birefringence (Δn) is increased by taking the material in the range of 1.23 to 1.40.
Retardation value (Δn) defined by the product of thickness and thickness (d)
D) A method for producing a convex lens-like polarizing plate for eyeglasses, comprising laminating a polycarbonate resin sheet (3) having a thickness of 3000 to 6000 nm and performing a curved surface processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8133389A JP2838514B2 (en) | 1996-05-28 | 1996-05-28 | Method for producing convex lens-shaped polarizing plate for glasses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8133389A JP2838514B2 (en) | 1996-05-28 | 1996-05-28 | Method for producing convex lens-shaped polarizing plate for glasses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH095683A JPH095683A (en) | 1997-01-10 |
| JP2838514B2 true JP2838514B2 (en) | 1998-12-16 |
Family
ID=15103607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8133389A Expired - Lifetime JP2838514B2 (en) | 1996-05-28 | 1996-05-28 | Method for producing convex lens-shaped polarizing plate for glasses |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2838514B2 (en) |
Cited By (2)
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|---|---|---|---|---|
| WO2006040954A1 (en) | 2004-10-08 | 2006-04-20 | Daicel Chemical Industries, Ltd. | Protective film for polarizing film and polarizing multilayer body |
| JP2006227591A (en) * | 2005-01-21 | 2006-08-31 | Daicel Chem Ind Ltd | Polarizable laminate and manufacturing method thereof |
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|---|---|---|---|---|
| TW534869B (en) | 2000-06-09 | 2003-06-01 | Mitsubishi Gas Chemical Co | Synthetic resin laminate having both polarization characteristic and photochromism characteristic, and molded article obtained therefrom |
| KR100822689B1 (en) * | 2001-06-01 | 2008-04-17 | 미츠비시 가스 가가쿠 가부시키가이샤 | Plastic molded product having photochromic characteristics and/or polarizing characteristics |
| JP4281998B2 (en) * | 2003-06-06 | 2009-06-17 | 三菱瓦斯化学株式会社 | Polycarbonate resin composition |
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| CN102027405A (en) * | 2008-05-13 | 2011-04-20 | 帝人化成株式会社 | Polarizing eyeglass lens |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5977401A (en) * | 1982-09-22 | 1984-05-02 | Nitto Electric Ind Co Ltd | Polarizing plate |
| JPS60257403A (en) * | 1984-06-04 | 1985-12-19 | Nitto Electric Ind Co Ltd | Polarizing plate |
| JPS629303A (en) * | 1985-07-06 | 1987-01-17 | Nitto Electric Ind Co Ltd | Polarizing plate |
| JPH0794154B2 (en) * | 1987-07-17 | 1995-10-11 | 三菱瓦斯化学株式会社 | Method for manufacturing polarized polycarbonate lens |
| JPH0339903A (en) * | 1989-04-27 | 1991-02-20 | Mitsubishi Gas Chem Co Inc | Antidazzle polarizing plate made of polycarbonate |
-
1996
- 1996-05-28 JP JP8133389A patent/JP2838514B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006040954A1 (en) | 2004-10-08 | 2006-04-20 | Daicel Chemical Industries, Ltd. | Protective film for polarizing film and polarizing multilayer body |
| EP2584386A1 (en) | 2004-10-08 | 2013-04-24 | Daicel Chemical Industries, Ltd. | Protective Film for Polarizing Membrane and Polarizing Laminate |
| US8440317B2 (en) | 2004-10-08 | 2013-05-14 | Daicel Chemical Industries, Ltd. | Protective film for polarizing membrane and polarizing laminate |
| JP2006227591A (en) * | 2005-01-21 | 2006-08-31 | Daicel Chem Ind Ltd | Polarizable laminate and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH095683A (en) | 1997-01-10 |
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