JPH05185472A - Molding method of plastic lens - Google Patents
Molding method of plastic lensInfo
- Publication number
- JPH05185472A JPH05185472A JP20054992A JP20054992A JPH05185472A JP H05185472 A JPH05185472 A JP H05185472A JP 20054992 A JP20054992 A JP 20054992A JP 20054992 A JP20054992 A JP 20054992A JP H05185472 A JPH05185472 A JP H05185472A
- Authority
- JP
- Japan
- Prior art keywords
- induction heating
- cavity
- insert
- die
- heating coil
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
-
- 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)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、溶融プラスチックを
金型のキャビティに射出充填して、レンズを成形する方
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 molding a lens by injection-filling a molten plastic into a cavity of a mold.
【０００２】[0002]
【従来の技術】肉厚分布に大きな差がある成形品を射出
成形すると、薄肉部分から厚肉部分へと冷却固化が進行
する。また冷却固化に伴う薄肉部分と厚肉部分での収縮
は大きく異なり、不均一な収縮が原因で残留ヒズミが発
生する。2. Description of the Related Art When a molded product having a large difference in wall thickness distribution is injection-molded, cooling and solidification progresses from a thin portion to a thick portion. Further, the shrinkage between the thin portion and the thick portion due to cooling and solidification is very different, and residual strain occurs due to uneven shrinkage.
【０００３】そこで寸法精度が要求されるレンズの成形
に当っては、冷却固化の過程において全体を圧縮し、こ
れによりヒズミや転写不良の発生を防止している。Therefore, when molding a lens that requires high dimensional accuracy, the entire body is compressed during the process of cooling and solidification, thereby preventing generation of flaws and transfer defects.
【０００４】しかし金型による成形品の圧縮量はきわめ
て僅かであり、また薄肉部分が過圧縮され易いなどのこ
とから、技術的に難しく、これまでの一通りの技術によ
る圧縮操作により、充填ヒズミや配向ヒズミなどの内部
ヒズミを除くことはできても、不均一な冷却収縮が原因
とされる収縮ヒズミまたは逆の圧縮ヒズミの完全な除去
には苦労している。However, the amount of compression of the molded product by the mold is extremely small, and the thin portion is easily over-compressed, so it is technically difficult. Although internal strains such as orientated strains can be removed, it is difficult to completely remove shrinkage strains or converse compression strains caused by uneven cooling shrinkage.
【０００５】そのような不均一な冷却による収縮ヒズミ
の除去手段として、レンズ成形品の肉厚分布により異な
る固化速度を、厚肉部分に対しては冷却により強制的に
促進し、薄肉部分に対しては加熱により遅らせて等しく
制御する発明（特願平２−１６４２３号参照）を先に成
した。As means for removing shrinkage flaws due to such non-uniform cooling, the solidification rate, which varies depending on the wall thickness distribution of the lens molded product, is forcibly promoted by cooling the thick part and the thin part is cooled. In the first place, an invention (refer to Japanese Patent Application No. 2-16423) in which the heating is delayed and the control is made equally has been made.
【０００６】[0006]
【発明が解決しようとする課題】この先の発明では、固
定ベース金型と可動ベース金型との内部に、入子型を嵌
装しており、その一対の入子型のパーティング部にレン
ズの光学面を形成するキャビティを設けるとともに、両
入子型のキャビティ側を磁性体により構成し、その周囲
に電磁誘導加熱手段を配設している。According to the above invention, the insert mold is fitted inside the fixed base mold and the movable base mold, and the lens is attached to the parting part of the pair of insert molds. In addition to providing a cavity for forming the optical surface, the cavity side of the double-entry mold is made of a magnetic material, and the electromagnetic induction heating means is disposed around the cavity.
【０００７】この電磁誘導加熱では、誘導加熱コイルの
通電により発生するジュール熱により入子型を加熱する
ので、加熱操作が容易となる利点を有するが、加熱範囲
が主として誘導加熱コイル近傍となるため、加熱を受け
る部分は誘導加熱コイルの近くにあるのが好ましい。In this electromagnetic induction heating, since the insert die is heated by the Joule heat generated by energization of the induction heating coil, there is an advantage that the heating operation becomes easy, but the heating range is mainly in the vicinity of the induction heating coil. Preferably, the part to be heated is near the induction heating coil.
【０００８】しかしながら、片側を凸に形成したレンズ
を成形するキャビティでは、その断面形状から両側の光
学面を成形する型面（以下光学面と称する）と誘導加熱
コイルとの間に距離差が生じており、その状態で両方の
入子型を誘導加熱コイルの通電により加熱すると、光学
面では温度に差が生ずる。このため両方を所定温度まで
加熱するにはかなりの時間（例えば３分）を要し、また
必然的に成形サイクルも長くなり、消費電力も多くな
る。However, in a cavity for molding a lens whose one side is convex, there is a distance difference between the induction heating coil and a mold surface (hereinafter referred to as an optical surface) for molding optical surfaces on both sides due to its sectional shape. In this state, if both insert molds are heated by energizing the induction heating coil, a difference in temperature occurs on the optical surface. For this reason, it takes a considerable time (for example, 3 minutes) to heat both of them to a predetermined temperature, and inevitably the molding cycle becomes long and the power consumption becomes large.
【０００９】この発明は上記課題を解決するために考え
られたものであって、その目的は、簡単な手段により両
方の入子型を光学面まで効率よく短時間にて加熱するこ
とができる新たなプラスチックレンズの成形方法を提供
することにある。The present invention has been conceived in order to solve the above problems, and an object of the present invention is to newly heat both insert molds to an optical surface efficiently and in a short time by a simple means. Another object of the present invention is to provide a simple plastic lens molding method.
【００１０】[0010]
【課題を解決するための手段】上記目的によるこの発明
の特徴は、固定ベース金型と可動ベース金型との内部
に、入子型を相互に摺動自在に設け、その一対の入子型
のパーティング部にレンズ成形用キャビティの光学面を
設けるとともに、両入子型のキャビティ側周囲に電磁誘
導加熱手段を配設し、その電磁誘導加熱手段の誘導加熱
コイルに通電を行って上記光学面を加熱したのち、溶融
樹脂を射出充填してプラスチックレンズを成形するにあ
たり、上記入子型の摺動により定位置のキャビティを移
動して、上記誘電加熱コイルに対する両方の光学面の位
置を略等しくしたのち両入子型の加熱を行い、溶融樹脂
の射出充填はその光学面を元に戻してキャビティを形成
したのちに行うことにある。The features of the present invention according to the above-mentioned object are that a nesting die is provided inside a fixed base die and a movable base die slidably with respect to each other, and a pair of nesting die The optical surface of the lens forming cavity is provided in the parting part of the, and the electromagnetic induction heating means is arranged around the cavity side of the double-entry mold, and the induction heating coil of the electromagnetic induction heating means is energized to perform the above-mentioned optical operation. After heating the surface, injection molding of molten resin to mold a plastic lens moves the cavity in a fixed position by sliding the insert die, and makes the positions of both optical surfaces relative to the dielectric heating coil approximately After making them equal, the double-entry type is heated, and the injection filling of the molten resin is performed after the optical surface is returned to the original state to form the cavity.
【００１１】またこの発明は、誘導加熱コイルとの距離
差が大きい側の光学面を、入子型の摺動により誘導加熱
コイルの近傍に移動し、或は両方の光学面を入子型の摺
動により誘導加熱コイルの近傍に移動して加熱すること
を特徴とするものでもある。Further, according to the present invention, the optical surface on the side where the distance from the induction heating coil is large is moved to the vicinity of the induction heating coil by sliding the insertion type, or both optical surfaces are of the insertion type. It is also characterized in that it moves to the vicinity of the induction heating coil by sliding to heat it.
【００１２】[0012]
【作 用】上記方法では、溶融樹脂の射出充填の前に入
子型を摺動して、キャビティの光学面を誘導加熱コイル
の近傍に移動し、しかる後に誘導加熱コイルに通電して
光学面を加熱するので、キャビティの型閉位置では両側
の光学面と誘導加熱コイルとに距離差があっても、距離
差による光学面の温度差が解消され、また両側の光学面
の加熱が短時間で効率良く行われる。[Operation] In the above method, the injection mold of the molten resin is slid, the optical surface of the cavity is moved to the vicinity of the induction heating coil, and then the induction heating coil is energized. Since the cavity is heated, even if there is a distance difference between the optical surface on both sides and the induction heating coil at the mold closed position of the cavity, the temperature difference between the optical surfaces due to the distance difference is eliminated, and the heating of the optical surfaces on both sides is short. Done efficiently.
【００１３】[0013]
【実施例】図１は、この発明の実施に用いられる成形金
型の具体例を示すもので、成形金型は固定側のベース金
型１及び可動側のベース金型２と、それらベース金型
１，２に相互に摺動自在に嵌挿した円柱形の入子型３，
４とから構成してある。なお入子型３，４のキャビティ
を形成する前部は磁性体よりなる。FIG. 1 shows a concrete example of a molding die used for carrying out the present invention. The molding die includes a fixed base metal mold 1 and a movable base metal mold 2, and the base metal molds. Cylindrical insert die 3, which is slidably fitted in the die 1, 2.
It is composed of 4 and. The front part of the cavity of the insert molds 3 and 4 is made of a magnetic material.
【００１４】上記入子型３，４の内端面は、片側が凸に
形成されたレンズのキャビティ５をパーティング部に形
成する型面、即ち光学面５ａ，５ｂに形成してある。ま
た上記キャビティ５ではキャビティ周縁部が最もレンズ
の薄肉部分を成形するので、その部分の溶融プラスチッ
クの冷却固化を加熱により抑制する目的で、入子型３，
４の周囲に誘導加熱コイル６と筒状の磁性体７とによる
電磁誘導加熱手段８が嵌装してある。またレンズの厚肉
を形成する中央部には、流路端面を球面状に形成してキ
ャビティ５に臨ませた冷却用の温調流路９が設けてあ
る。The inner end surfaces of the insert molds 3 and 4 are formed on the mold surfaces for forming the cavity 5 of the lens, one side of which is convex, on the parting part, that is, the optical surfaces 5a and 5b. Further, in the cavity 5, the peripheral edge portion of the cavity forms the thinnest portion of the lens, and therefore the insert die 3,
An electromagnetic induction heating means 8 composed of an induction heating coil 6 and a cylindrical magnetic body 7 is fitted around the periphery of the magnetic recording medium 4. In addition, a temperature control channel 9 for cooling is provided at the center of the lens where the wall thickness is formed, the channel end surface having a spherical shape and facing the cavity 5.
【００１５】この温調流路９と上記誘導加熱コイル６の
設定位置は、成形されるレンズの断面形状によって定め
られる。また両入子型３，４の外端は、それぞれ押圧板
１０，１１に部材１２，１３をもって連結してあり、そ
れら押圧板１０，１１により軸方向に移動できるように
してある。なお１４は温度測定部材を示す。The setting positions of the temperature control passage 9 and the induction heating coil 6 are determined by the sectional shape of the lens to be molded. The outer ends of the double insert molds 3 and 4 are connected to the pressing plates 10 and 11 with members 12 and 13, respectively, so that the pressing plates 10 and 11 can move in the axial direction. Reference numeral 14 indicates a temperature measuring member.
【００１６】このような成形金型では、誘導加熱コイル
６に通電を行い、磁性体の入子型３，４に高周波磁束を
通すことにより、入子型内部にうず電流を発生させ、う
ず電流と入子型の固有抵抗とによって生ずるジュール熱
によって、上記入子型３，４をガラス転移点以上の温度
に加熱することができる。In such a molding die, the induction heating coil 6 is energized to pass a high-frequency magnetic flux through the magnetic material insert molds 3 and 4 to generate an eddy current inside the insert mold, thereby generating an eddy current. The nest molds 3 and 4 can be heated to a temperature equal to or higher than the glass transition point by the Joule heat generated by the specific resistance of the nest mold.
【００１７】しかし誘導加熱コイル６の通電による光学
面５ａ，５ｂの加熱は、溶融樹脂の射出充填前の限られ
た時間内に行う必要があることから、その制限時間内で
の通電による入子型３，４の加熱は、主として誘導加熱
コイル６により囲繞された部分となり易い。However, since the heating of the optical surfaces 5a and 5b by energizing the induction heating coil 6 needs to be performed within a limited time before the injection and filling of the molten resin, the energization by energization within the limited time is necessary. The heating of the molds 3 and 4 is likely to occur mainly in the portion surrounded by the induction heating coil 6.
【００１８】プラスチックレンズの成形は、まず両光学
面の加熱から始まる。この加熱は溶融樹脂をキャビティ
５に射出する前に行うが、キャビティ５の両光学面は、
成形するレンズの断面形状から、図示のごとく入子型３
側の光学面５ａよりも入子型４側の光学面５ｂが凸に形
成されているため、キャビティ５の定位置（型閉位置）
では、光学面５ａ，５ｂと誘導加熱コイル６，６との間
の距離に差が生じている。Molding of a plastic lens begins with heating both optical surfaces. This heating is performed before injecting the molten resin into the cavity 5, but both optical surfaces of the cavity 5 are
From the cross-sectional shape of the lens to be molded, insert mold 3 as shown
Since the optical surface 5b on the nesting die 4 side is formed to be more convex than the optical surface 5a on the side, the fixed position of the cavity 5 (mold closed position)
Then, there is a difference in the distance between the optical surfaces 5a and 5b and the induction heating coils 6 and 6.
【００１９】そこで誘導加熱コイル６，６の通電による
入子型４，５の加熱を効率良く短時間にて行うために、
定位置のキャビティ５を所定寸法だけ移動して、誘電加
熱コイル６，６に対する両方の光学面の位置を略等しく
する。このキャビティ５の移動は、光学面５ａが誘導加
熱コイル６に接近する方向に、押圧板１０，１１を相互
に移動して、入子型３，４を成形型１，２内を摺動する
ことにより行うことができ、これにより両方の光学面５
ａ，５ｂは図２に示すように、誘導加熱コイル６，６の
間の中央に距離を略等しくして位置する。Therefore, in order to efficiently heat the insert dies 4, 5 by energizing the induction heating coils 6, 6, in a short time,
The cavity 5 at a fixed position is moved by a predetermined dimension so that the positions of both optical surfaces with respect to the dielectric heating coils 6 and 6 are made substantially equal. This movement of the cavity 5 moves the pressing plates 10 and 11 to each other in a direction in which the optical surface 5a approaches the induction heating coil 6 and slides the insert dies 3 and 4 in the forming dies 1 and 2. Can be carried out by means of
As shown in FIG. 2, a and 5b are located in the center between the induction heating coils 6 and 6 with a substantially equal distance.
【００２０】キャビティ５の移動を完了した後、誘導加
熱コイル６，６に通電を行うと、入子型３．４が同時に
加熱され、同様に両側の光学面５ａ，５ｂも加熱され
る。入子型３，４を設定温度に加熱するまでの時間（１
〜１．５分）は予め測定されているので、その時間が経
過したら押圧板１０，１１を上記とは反対方向に移動し
て入子型３，４を元の位置まで摺動し、キャビティ５を
定位置に戻す。When the induction heating coils 6 and 6 are energized after the movement of the cavity 5 is completed, the insert mold 3.4 is simultaneously heated, and the optical surfaces 5a and 5b on both sides are similarly heated. Time to heat the insert molds 3 and 4 to the set temperature (1
(~ 1.5 minutes) is measured in advance, and after that time, the pressing plates 10 and 11 are moved in the opposite direction to slide the nesting dies 3 and 4 to their original positions, Return 5 to the home position.
【００２１】次に溶融樹脂をキャビティ５に射出充填し
レンズの成形を行う。凸レンズの形態に成形された溶融
樹脂は、入子型３，４とともに光学面５ａ，５ｂがガラ
ス転移点以上の温度に保たれているので、キャビティ５
で固化せず、溶融状態を維持する。Next, the molten resin is injected and filled in the cavity 5 to mold the lens. The molten resin molded in the form of a convex lens is kept in the cavity 5 because the optical surfaces 5a and 5b are kept at a temperature equal to or higher than the glass transition point together with the molds 3 and 4.
It does not solidify with and maintains a molten state.
【００２２】そこで、充填完了後に固定側の入子型３は
そのままにして、可動側の入子型４を押圧板１１により
軸方向に加圧し、溶融状態のレンズ成形品を圧縮する
と、レンズ成形品における充填ヒズミや配向ヒズミなど
の内部ヒズミが除去される。Therefore, after the filling is completed, the fixed insert mold 3 is left as it is, and the movable insert mold 4 is axially pressed by the pressing plate 11 to compress the lens molded product in the molten state. Internal flaws such as filling flaws and orientation flaws in the product are removed.
【００２３】この圧縮操作に並行して、レンズ成形品の
冷却を開始すると、冷却によるレンズ成形品の各部の固
化速度は異なり、溶融部分は薄肉部分から消失して行く
から、これを解消して全体的に消失するように、中央部
の流路１６に低温油を供給し、厚肉部分の冷却を強制的
に促進する。When cooling of the lens molded product is started in parallel with this compression operation, the solidification speeds of the respective parts of the lens molded product due to cooling are different, and the melted portion disappears from the thin portion, so this is eliminated. The low temperature oil is supplied to the flow passage 16 in the central portion so as to disappear entirely, and the cooling of the thick portion is forcibly promoted.
【００２４】この結果、レンズ成形品は中心軸対称の温
度勾配をもって冷却されることになり、内部の溶融層の
層厚は全体を通じて均一化して行くことになる。As a result, the lens molded article is cooled with a temperature gradient symmetrical about the central axis, and the layer thickness of the molten layer inside becomes uniform throughout.
【００２５】図３は、誘導加熱コイル６との距離差が大
きい側の光学面５ａを、入子型３の摺動により誘導加熱
コイル６の近傍に後退移動してのち、両入子型３，４の
加熱を行い、両側の光学面５ａ，５ｂの加熱を短時間で
効率良く行う場合を示すものである。In FIG. 3, the optical surface 5a on the side where the distance from the induction heating coil 6 is large is retreated to the vicinity of the induction heating coil 6 by sliding of the nesting die 3, and then the double nesting type 3 is inserted. , 4 and the optical surfaces 5a, 5b on both sides are heated efficiently in a short time.
【００２６】図４は、両側の光学面５ａ，５ｂを両入子
型３，４の摺動により誘導加熱コイル６の近傍に後退移
動してのち、両入子型３，４の加熱を行い、両側の光学
面５ａ，５ｂの加熱を短時間で効率良く行う場合を示す
ものである。In FIG. 4, the optical surfaces 5a and 5b on both sides are moved backward by the sliding of the double insert molds 3 and 4 in the vicinity of the induction heating coil 6, and then the double insert molds 3 and 4 are heated. , The case where the optical surfaces 5a and 5b on both sides are heated efficiently in a short time.
【００２７】上記何れの場合でも光学面５ａ，５ｂの加
熱後には、移動した光学面を元の位置に戻してキャビテ
ィ５を形成してから溶融樹脂の射出充填を行う。In any of the above cases, after heating the optical surfaces 5a and 5b, the moved optical surface is returned to its original position to form the cavity 5, and then the molten resin is injected and filled.
【００２８】[0028]
【発明の効果】この発明は上述のように、入子型の加熱
に際して、成形するレンズの断面形状により、キャビテ
ィ両側の光学面と誘導加熱コイルの距離が異なっても、
入子型の摺動により光学面を誘導加熱コイルの近傍に移
動して、入子型の加熱を行うので、光学面を含む入子型
の加熱を、これまでよりも半分以下の時間で効率良く行
うことができる。As described above, according to the present invention, when heating the insert die, the distance between the optical surfaces on both sides of the cavity and the induction heating coil may differ depending on the sectional shape of the lens to be molded.
Since the optical surface is moved to the vicinity of the induction heating coil by the sliding of the insert type to perform the insert type heating, the efficiency of the insert type heating including the optical surface can be reduced to less than half the time. You can do it well.
【００２９】また加熱前に入子型を設定寸法だけ移動す
るだけでよいから簡単で、加熱時間も短時間で済むた
め、消費電力の節減ともなり、成形サイクルも短縮され
るので生産性も向上し、成形コストも低減する他、同一
温度に加熱された両光学面によってヒズミのない良品の
プラスチックレンズの射出成形が可能となるなどの特長
を有する。Further, since it is only necessary to move the insert mold by a set dimension before heating, the heating time is short, power consumption is saved, and the molding cycle is shortened, so that productivity is improved. However, in addition to reducing the molding cost, it is possible to perform injection molding of a good plastic lens without distortion by using both optical surfaces heated to the same temperature.
【図１】この発明の実施に用いるプラスチックレンズの
成形金型の断面図である。FIG. 1 is a cross-sectional view of a plastic lens molding die used for carrying out the present invention.
【図２】キャビティを移動して光学面の位置を修正した
際の成形金型の要部断面図である。FIG. 2 is a sectional view of a main part of a molding die when a cavity is moved to correct the position of an optical surface.
【図３】誘導加熱コイルから離れた側の光学面を誘導加
熱コイル近傍に位置させ際の成形金型の要部断面図であ
る。FIG. 3 is a cross-sectional view of a main part of a molding die when an optical surface on the side away from the induction heating coil is positioned near the induction heating coil.
【図４】キャビティ両側の光学面を誘導加熱コイル近傍
に位置させ際の成形金型の要部断面図である。FIG. 4 is a cross-sectional view of a main part of a molding die when the optical surfaces on both sides of the cavity are positioned near the induction heating coil.
１ 固定ベース金型 ２ 可動ベース金型 ３ 入子型 ４ 入子型 ５ キャビティ ５ａ 光学面 ５ｂ 光学面 ６ 誘導加熱コイル ７ 磁性体 ８ 電磁誘導加熱手段 ９ 温調流路 １０ 押圧板 １１ 押圧板 1 Fixed Base Mold 2 Movable Base Mold 3 Nesting Mold 4 Nesting Mold 5 Cavity 5a Optical Surface 5b Optical Surface 6 Induction Heating Coil 7 Magnetic Material 8 Electromagnetic Induction Heating Means 9 Temperature Control Channel 10 Pressing Plate 11 Pressing Plate
Claims (3)
部に、入子型を相互に摺動自在に設け、その一対の入子
型のパーティング部にレンズ成形用キャビティの光学面
を形成するとともに、両入子型のキャビティ側周囲に電
磁誘導加熱手段を配設し、その電磁誘導加熱手段の誘電
加熱コイルに通電を行って上記入子型を加熱したのち
に、プラスチックレンズを射出成形するにあたり、上記
入子型の摺動により定位置のキャビティを移動して、上
記誘電加熱コイルに対する両方の光学面の位置を略等し
くしたのち両入子型の加熱を行い、溶融樹脂の射出充填
はキャビティを定位置に戻して行うことを特徴とするプ
ラスチックレンズの成形方法。1. A nesting die is slidably provided inside a fixed base die and a movable base die, and an optical surface of a lens forming cavity is provided at a parting portion of the pair of nesting die. After forming, the electromagnetic induction heating means is arranged around the cavity side of both insert molds, the induction heating coil of the electromagnetic induction heating means is energized to heat the insert mold, and then the plastic lens is injected. In molding, the cavity of a fixed position is moved by sliding of the insert mold, the positions of both optical surfaces with respect to the dielectric heating coil are made approximately equal, and then the insert mold is heated to inject the molten resin. A method of molding a plastic lens, wherein the filling is performed by returning the cavity to a fixed position.
部に、入子型を相互に摺動自在に設け、その一対の入子
型のパーティング部にレンズ成形用キャビティの光学面
を形成するとともに、両入子型のキャビティ側周囲に電
磁誘導加熱手段を配設し、その電磁誘導加熱手段の誘電
加熱コイルに通電を行って上記入子型を加熱したのち
に、プラスチックレンズを射出成形するにあたり、上記
誘導加熱コイルから大きくはなれた側の光学面を、入子
型の摺動により誘導加熱コイルの近傍に移動したのち両
入子型の加熱を行い、溶融樹脂の射出充填はその光学面
を元に戻してキャビティを形成したのちに行うことを特
徴とするプラスチックレンズの成形方法。2. A nesting die is slidably provided inside the fixed base die and the movable base die, and an optical surface of a lens forming cavity is provided on a parting portion of the pair of nesting die. After forming, the electromagnetic induction heating means is arranged around the cavity side of both insert molds, the induction heating coil of the electromagnetic induction heating means is energized to heat the insert mold, and then the plastic lens is injected. Upon molding, the optical surface on the side largely separated from the induction heating coil is moved to the vicinity of the induction heating coil by sliding of the nesting type, and then both nesting types of heating are performed, and the injection filling of the molten resin is performed. A method for molding a plastic lens, which is characterized in that the optical surface is returned to the original state to form a cavity.
部に、入子型を相互に摺動自在に設け、その一対の入子
型のパーティング部にレンズ成形用キャビティの光学面
を形成するとともに、両入子型のキャビティ側周囲に電
磁誘導加熱手段を配設し、その電磁誘導加熱手段の誘電
加熱コイルに通電を行って上記入子型を加熱したのち
に、プラスチックレンズを射出成形するにあたり、両入
子型の摺動により両側の光学面を各誘導加熱コイルの近
傍に移動したのち両入子型の加熱を行い、溶融樹脂の射
出充填は両光学面を元に戻してキャビティを形成したの
ちに行うことを特徴とするプラスチックレンズの成形方
法。3. A nesting die is slidably provided inside the fixed base die and the movable base die, and an optical surface of a lens forming cavity is provided at a parting portion of the pair of nesting die. After forming, the electromagnetic induction heating means is arranged around the cavity side of both insert molds, the induction heating coil of the electromagnetic induction heating means is energized to heat the insert mold, and then the plastic lens is injected. In molding, the optical surfaces on both sides are moved to the vicinity of each induction heating coil by sliding of the double insert molds, and then the double insert molds are heated. A method for molding a plastic lens, which is performed after forming a cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20054992A JPH0710549B2 (en) | 1991-07-05 | 1992-07-03 | Molding method for plastic lens |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-191272 | 1991-07-05 | ||
| JP19127291 | 1991-07-05 | ||
| JP20054992A JPH0710549B2 (en) | 1991-07-05 | 1992-07-03 | Molding method for plastic lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05185472A true JPH05185472A (en) | 1993-07-27 |
| JPH0710549B2 JPH0710549B2 (en) | 1995-02-08 |
Family
ID=26506589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20054992A Expired - Fee Related JPH0710549B2 (en) | 1991-07-05 | 1992-07-03 | Molding method for plastic lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0710549B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000051805A1 (en) * | 1999-03-02 | 2000-09-08 | Feinwerktechnik Wetzlar Gmbh | Injection moulding device and method for preparing precision-optical and precision-mechanical parts from a thermoplastic |
| US7378048B2 (en) * | 2002-12-03 | 2008-05-27 | Boston Scientific Scimed, Inc. | Method for forming catheter curves |
| CN109551709A (en) * | 2017-09-27 | 2019-04-02 | 均贺科技股份有限公司 | Optical sheet ejection formation modular structure |
| CN109648771A (en) * | 2019-01-29 | 2019-04-19 | 金雨谷 | A kind of speed heat of high molecular material foaming, fast-cooling system |
| FR3118897A1 (en) * | 2021-01-20 | 2022-07-22 | Roctool | Induction heating device suitable for molding a small part |
-
1992
- 1992-07-03 JP JP20054992A patent/JPH0710549B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000051805A1 (en) * | 1999-03-02 | 2000-09-08 | Feinwerktechnik Wetzlar Gmbh | Injection moulding device and method for preparing precision-optical and precision-mechanical parts from a thermoplastic |
| US7378048B2 (en) * | 2002-12-03 | 2008-05-27 | Boston Scientific Scimed, Inc. | Method for forming catheter curves |
| CN109551709A (en) * | 2017-09-27 | 2019-04-02 | 均贺科技股份有限公司 | Optical sheet ejection formation modular structure |
| CN109648771A (en) * | 2019-01-29 | 2019-04-19 | 金雨谷 | A kind of speed heat of high molecular material foaming, fast-cooling system |
| FR3118897A1 (en) * | 2021-01-20 | 2022-07-22 | Roctool | Induction heating device suitable for molding a small part |
| WO2022157275A1 (en) * | 2021-01-20 | 2022-07-28 | Roctool | Induction heating device for moulding parts with small dimensions |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0710549B2 (en) | 1995-02-08 |
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