JPH0218213B2 - - Google Patents
Info
- Publication number
- JPH0218213B2 JPH0218213B2 JP59158359A JP15835984A JPH0218213B2 JP H0218213 B2 JPH0218213 B2 JP H0218213B2 JP 59158359 A JP59158359 A JP 59158359A JP 15835984 A JP15835984 A JP 15835984A JP H0218213 B2 JPH0218213 B2 JP H0218213B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- cavity
- molding
- gate
- mold
- 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
- 238000000465 moulding Methods 0.000 claims description 22
- 239000004033 plastic Substances 0.000 claims description 7
- 238000001746 injection moulding Methods 0.000 claims description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 3
- 239000012778 molding material Substances 0.000 claims description 2
- 238000001721 transfer moulding Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 description 18
- 229920005989 resin Polymers 0.000 description 18
- 230000000694 effects Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- LOUPRKONTZGTKE-WZBLMQSHSA-N Quinine Chemical compound C([C@H]([C@H](C1)C=C)C2)C[N@@]1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OC)C=C21 LOUPRKONTZGTKE-WZBLMQSHSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000001258 Cinchona calisaya Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- LOUPRKONTZGTKE-UHFFFAOYSA-N cinchonine Natural products C1C(C(C2)C=C)CCN2C1C(O)C1=CC=NC2=CC=C(OC)C=C21 LOUPRKONTZGTKE-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229960000948 quinine Drugs 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002335 surface treatment layer Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はプラスチツクレンズ成形用金型に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a mold for molding plastic lenses.
プラスチツク材料の開発に伴つて、関連技術は
急速に進歩発展した。なかでも、アクリル系樹脂
のような光学的性質の優れた樹脂を原料にして、
精度の良好な金型を用いて各種の光学用部品を成
形することによつて、従来のガラスに代わるきわ
めて軽量で破損しにくいものが得られるようにな
り、眼鏡用のレンズ等に広く愛用されていること
はよく知られている。そして、このようなプラス
チツクレンズを成形するにあたつては、たとえ
ば、第６図（従来の金型から取り出した状態の樹
脂成形物の形状を例示し、この樹脂成形物の各部
名称をそれに対応する金型の各部名称で呼ぶこと
にする。以下第１〜５図においても同じ。）のよ
うな複数個成形方式においては、溶融樹脂はスプ
ルーＳ、ランナーＲ、ゲートＧを経てキヤビテイ
Ｃ（レンズ成形部分）に流入し、樹脂の種類や成
形体の寸法によつて当然変化はあるが、一応の基
準としては、スプルーＳには２〜6゜程度のテーパ
を付け小さい径は成形機のノズル径よりも0.5〜
１mm程度大きくし、ランナーＲは通常４〜８mm
径、ゲートＧは溶融樹脂がキヤビテイＣに充満す
るとすぐ固化するように厚さまたは断面積を非常
に小さく、たとえば、制限ゲート、抵抗ゲート、
ピンゲート、フアンゲート、フイルムゲートのよ
うに、するとよいと言われている。
With the development of plastic materials, related technologies have rapidly advanced and developed. Among them, resins with excellent optical properties such as acrylic resins are used as raw materials,
By molding various optical parts using high-precision molds, it has become possible to create extremely lightweight and unbreakable replacements for conventional glass, which are widely used in eyeglass lenses. It is well known that When molding such a plastic lens, for example, Figure 6 (illustrating the shape of a resin molded product taken out from a conventional mold, and naming each part of this resin molded product correspondingly) In a multiple molding method such as the one shown in Figures 1 to 5, the molten resin passes through the sprue S, runner R, and gate G to the cavity C (lens). Naturally, this will vary depending on the type of resin and the dimensions of the molded product, but as a general rule, the sprue S should be tapered by about 2 to 6 degrees, and the smaller diameter should be connected to the nozzle of the molding machine. 0.5~ than the diameter
Increase the size by about 1 mm, and the runner R is usually 4 to 8 mm.
The diameter and gate G have a very small thickness or cross-sectional area so that the molten resin solidifies as soon as it fills the cavity C. For example, a limiting gate, a resistive gate,
It is said that it is good to do things like pin gate, fan gate, and film gate.
一方、アクリル系樹脂等の成形品の安全性（特
に耐衝撃性）を向上させるために、または、蒸着
等による表面処理層の保護のためなどに、２枚の
成形体を接着剤で貼り合わせ、サンドイツチ状の
積層物とする技術もよく知られているところであ
る。 On the other hand, in order to improve the safety (especially impact resistance) of molded products such as acrylic resin, or to protect the surface treatment layer by vapor deposition, etc., two molded products are bonded together with adhesive. The technique of forming a sandwich-like laminate is also well known.
しかし、従来の基準にもとづいた金型でレンズ
を成形すれば、細いゲートＧからキヤビテイＣに
押し込められた樹脂の分子配向は乱れ、成形品の
組織にかなり複雑な歪みを残すことになる。した
がつて、低級なレンズにおいては大した支障が起
らなくても、たとえばプラスチツクフイルムに過
沃硫酸キニーネを配向させて得られる偏光膜を２
枚のレンズ間にサンドイツチして反射光線等のま
ぶしさを防ぐための偏光レンズを得ようとすると
きは、レンズの歪みがわざわいして、折角の偏光
効果は発揮されず、満足される偏光レンズは得ら
れなかつた。この発明は、歪みがなくて偏光レン
ズ作製に際しても支障を来たさないレンズを成形
するための金型の開発を技術的課題とするもので
ある。
However, if a lens is molded using a mold based on conventional standards, the molecular orientation of the resin forced into the cavity C through the narrow gate G will be disturbed, leaving quite complex distortions in the structure of the molded product. Therefore, even if there is no major problem with low-grade lenses, for example, if a polarizing film obtained by orienting quinine periodic sulfate on a plastic film is used,
When trying to obtain a polarized lens to prevent glare from reflected rays by sandwiching between two lenses, the distortion of the lens becomes a problem and the polarizing effect cannot be achieved, resulting in a satisfactory polarization. I couldn't get the lens. The technical objective of this invention is to develop a mold for molding a lens that is free from distortion and does not cause any problems when manufacturing polarized lenses.
このような問題点を解決するために、この発明
は射出成形用およびトランスフアー成形用金型に
おいて、溶融された成形材料がスプルーから直接
もしくはランナーを経てレンズ成形用キヤビテイ
に入るゲート部分がレンズ成形用キヤビテイの厚
みとほぼ同等の厚みであり、かつ、径がレンズ成
形用キヤビテイの径の0.4〜0.6倍である円形平板
状の空間であつて、この円形平板状の空間とレン
ズ成形用キヤビテイとが、レンズ成形用キヤビテ
イの円周の1/10から1/6の範囲の円弧を共有した
状態でオーバーラツプし、部分月食時の一部侵食
された月の映像のような形状を呈していることを
特徴とするプラスチツクレンズ成形用金型を提供
するものであり、以下図面を用いてその詳細を述
べる。
In order to solve these problems, the present invention provides injection molding and transfer molding molds in which the gate part where the molten molding material enters the lens molding cavity directly from the sprue or through the runner is used for lens molding. A circular flat space having a thickness approximately equal to that of the lens molding cavity and a diameter of 0.4 to 0.6 times the diameter of the lens molding cavity, and the circular flat space and the lens molding cavity are connected to each other. However, they overlap while sharing an arc ranging from 1/10 to 1/6 of the circumference of the lens molding cavity, creating a shape similar to the image of a partially eroded moon during a partial lunar eclipse. The present invention provides a mold for molding plastic lenses characterized by the above features, and the details thereof will be described below with reference to the drawings.
まず、この発明におけるプラスチツク成形用金
型の方式は、従来広く用いられている上下割りの
割型で、１個のスプルーＳに対応して、キヤビテ
イＣが１個（図示は省略）であつても、第１図の
ように２個または第３図のように４個であつて
も、特にキヤビテイＣの個数を限定するものでは
なく、また、スプルーＳおよびランナーＲさらに
はキヤビテイＣのそれぞれの寸法、形状および相
互のなす角度（たとえば第２図にはキヤビテイＣ
の円周が形成する平面がランナーＲの両側に対し
て傾斜している例を、また第４図にはキヤビテイ
ＣとランナーＲとがスプルーＳに対して同じ角度
で傾斜している例を示した）等は特に限定される
ものではない。しかし、この発明におけるランナ
ーＲとキヤビテイＣとは、従来の金型における細
長いゲートＧに代わつて、円形の平板状空間によ
つて連絡している。この円形の平板状空間はキヤ
ビテイＣ内におおける溶融樹脂の分子配向の乱れ
を事前に取り除くために設けられるものであり、
この発明においては特にこの円形の平板状空間部
分をバツフアーゲートＢと呼ぶが、これはキヤビ
テイＣとほぼ同等の厚さ（キヤビテイＣの直径の
大小によつて異なるが通常の２枚貼り合わせの眼
鏡用レンズの場合約0.8〜1.2mm）で、径はキヤビ
テイＣの径の0.4〜0.6倍とし、さらに、ランナー
ＲからこのバツフアーゲートＢに溶融樹脂が流入
する口は、第１図に示すような、バツフアーゲー
トＢの接線方向に位置する扇形ゲート１または第
３図に示すようなスリツト形ゲート２であつても
よい。バツフアーゲートＢからキヤビテイＣに溶
融樹脂が流出する部分は、バツフアーゲートＢの
一部がキヤビテイＣにオーバーラツプして、部分
月食時の月のような形状を呈しており、キヤビテ
イＣとオーバーラツプして形成される円弧３の長
さは、キヤビテイＣの全円周の1/10から1/6の範
囲である。なお、バツフアーゲートＢの円弧３に
沿つた部分は成形体を金型から取り出した後で、
そのレンズ部分とゲート部分とが切り離されやす
いように１〜２mm幅で厚さがバツフアーゲートＢ
の主要部分の厚さよりもやや薄い（たとえば0.7
〜0.8倍程度）分離帯を設ておくと好都合である。 First, the method of the plastic molding mold according to the present invention is a vertically split mold that has been widely used in the past, and has one cavity C (not shown) corresponding to one sprue S. The number of cavities C is not particularly limited, even if the number of cavities C is two as shown in Fig. 1 or four as shown in Fig. 3, and the number of cavities C is not particularly limited. Dimensions, shapes, and mutual angles (for example, the cavity C in Figure 2)
Fig. 4 shows an example in which the plane formed by the circumference of the sprue is inclined with respect to both sides of the runner R, and Fig. 4 shows an example in which the cavity C and the runner R are inclined at the same angle with respect to the sprue S. etc.) are not particularly limited. However, in the present invention, the runner R and the cavity C are communicated by a circular flat space instead of the elongated gate G in the conventional mold. This circular flat plate-like space is provided to remove in advance any disturbance in the molecular orientation of the molten resin within the cavity C.
In this invention, this circular flat plate-shaped space is particularly called the buffer gate B, and it has a thickness that is almost the same as that of the cavity C (although it differs depending on the diameter of the cavity C, it is the same thickness as the normal two-ply bonded space). In the case of eyeglass lenses, the diameter is 0.4 to 0.6 times the diameter of cavity C, and the opening through which molten resin flows from runner R to buffer gate B is shown in Figure 1. It may be a fan-shaped gate 1 located tangentially to the buffer gate B or a slit-shaped gate 2 as shown in FIG. The part where the molten resin flows from buffer gate B to cavity C has a shape similar to the moon during a partial lunar eclipse, with a part of buffer gate B overlapping cavity C, and overlaps with cavity C. The length of the arc 3 thus formed is in the range of 1/10 to 1/6 of the total circumference of the cavity C. Note that the part along the arc 3 of the buffer gate B is
B
slightly thinner than the main part of the thickness (e.g. 0.7
~0.8 times) It is convenient to provide a separation zone.
以上述べたバツフアーゲートＢを円形とする理
由は、溶融樹脂の流れを円滑にするためであり、
その大きさ、厚さ、さらには円弧３の長さ等を前
記のように限定する理由は、それぞれの限界値以
外ではバツフアーゲートＢの部分で歪みを予め除
去する効果が減退し、レンズ部分に歪みが及んで
好ましくないからである。 The reason why the buffer gate B mentioned above is circular is to smooth the flow of molten resin.
The reason for limiting the size, thickness, and length of the arc 3 as described above is that outside the respective limit values, the effect of eliminating distortion in advance at the buffer gate B is reduced, and the lens portion This is because distortion occurs, which is undesirable.
以上述べたことから明らかなように、バツフア
ーゲートＢを設けることによつて、ランナーＲか
ら圧入される溶融樹脂の分子配向の急激な乱れを
緩和し、さらにキヤビテイＣに圧入する際の分子
配向をも整えるという作用を発現させることにな
る。
As is clear from the above, by providing the buffer gate B, the rapid disturbance in the molecular orientation of the molten resin press-fitted from the runner R is alleviated, and the molecular orientation when press-fitted into the cavity C is further improved. It also has the effect of regulating the
実施例 １
第１図および第２図に示すような成形体を得る
２重焦点用プラスチツクレンズ成形用の割型（上
下）金型を作製した。その主要寸法はランナーＲ
の径7.8mm、バツフアーゲートＢの直径40mm、厚
さ1.0mm、円弧３の長さ31.4mm（キヤビテイＣの
全円周の1/8）、キヤビテイＣの直径80mm、厚さ
1.0mmである。
Example 1 Split molds (upper and lower) for molding a bifocal plastic lens to obtain a molded product as shown in FIGS. 1 and 2 were prepared. Its main dimensions are runner R
diameter 7.8 mm, buffer gate B diameter 40 mm, thickness 1.0 mm, arc 3 length 31.4 mm (1/8 of the total circumference of cavity C), cavity C diameter 80 mm, thickness
It is 1.0mm.
このような金型を射出成形機（日精樹脂工業社
製：FS−75S100SE型）に取り付け、原料樹脂
（旭化成工業社製：メタクリルMM樹脂“アクリ
ルペツト”）を樹脂温度235℃（ノズル240〜245
℃、前部240〜245℃、中間部235〜240℃、後部
205〜210℃）、型締圧力130Kg／cm2、射出圧力（３
段階）１次110Kg／cm2、２次70Kg／cm2、３次55
Kg／cm2で射出し、冷却後成形品を取り出し、２重
焦点レンズを得た。一方、２重焦点用でないとい
うこと以外は、曲率および前記主要寸法が全く同
一である金型および前記と同じ原料樹脂、射出成
形機を同一条件下で使用して２重焦点でないレン
ズを作製した。このレンズと前記２重焦点レンズ
とを用いて、レンズ全面を覆う大きさの偏光膜ク
ラレ社製：ビニロンフイルム7500光学用）を接着
剤（スリボン社製：アレリク3000）でサンドイツ
チ状に挾んで第７図イのように積層した。この積
層レンズはきわめて均一な淡青色を呈し、同様の
レンズを重ねて、一方のレンズを360゜回転させる
と、90゜回転するごとに明暗が鮮やかに繰り返え
され偏光を阻害するような歪みは全く認められな
かつた。 Attach such a mold to an injection molding machine (model FS-75S100SE, manufactured by Nissei Jushi Kogyo Co., Ltd.), and heat the raw resin (methacrylic MM resin “Acrylic PET” manufactured by Asahi Kasei Industries, Ltd.) at a resin temperature of 235°C (nozzle 240-245°C).
℃, front 240-245℃, middle 235-240℃, rear
205~210℃), mold clamping pressure 130Kg/cm 2 , injection pressure (3
Stage) 1st 110Kg/cm 2 , 2nd 70Kg/cm 2 , 3rd 55
After injection at Kg/cm 2 and cooling, the molded product was taken out to obtain a bifocal lens. On the other hand, a non-bifocal lens was produced using a mold with exactly the same curvature and the above-mentioned major dimensions, the same raw material resin, and an injection molding machine under the same conditions, except that it was not for a bifocal lens. . Using this lens and the above-mentioned bifocal lens, a polarizing film (manufactured by Kuraray Co., Ltd.: Vinylon Film 7500 for optical use), which is large enough to cover the entire surface of the lens, is sandwiched in a sandwich shape with adhesive (manufactured by Thribon Co., Ltd.: Aleriku 3000). Laminated as shown in Figure 7A. This laminated lens exhibits an extremely uniform light blue color, and when similar lenses are stacked on top of each other and one lens is rotated 360 degrees, the brightness and darkness repeat vividly every time the lens is rotated 90 degrees, creating a distortion that obstructs polarization. was not recognized at all.
実施例 ２
第３図〜第５図に示すような成形体を得る４個
取りの金型を作製した。すなわち、この場合のレ
ンズは単一焦点用であつて、バツフアーゲートＢ
は径7.8mmのランナーＲの径4.0mm、長さ25.0mmの
部分の両側に設けられた幅1.0mm、長さ19.0mmの
スリツト形ゲート２に連結された構造のものであ
る以外は成形品の主要寸法、使用原料および成形
条件は実施例１とほとんど同じてある。成形後得
られた４枚のレンズを２枚１組とし、実施例１と
同じ偏光膜と接着剤とを用いて、第７図ロに示す
ような部分偏光のサンドイツチ状レンズを２組作
製した。得られた部分偏光レンズはいずれも均一
な淡青色を呈し、２組のレンズを重ねて一方を回
転させると90゜回転するごとに明暗が鮮やかに繰
り返えされ、偏光を阻害するような歪みは全く認
められなかつた。Example 2 A four-cavity mold for producing a molded body as shown in FIGS. 3 to 5 was manufactured. That is, the lens in this case is for single focus, and the buffer gate B
is a molded product, except that it has a structure in which a runner R with a diameter of 7.8 mm is connected to a slit-shaped gate 2 with a width of 1.0 mm and a length of 19.0 mm provided on both sides of a portion with a diameter of 4.0 mm and a length of 25.0 mm. The main dimensions, raw materials used, and molding conditions are almost the same as in Example 1. The four lenses obtained after molding were made into a set of two, and using the same polarizing film and adhesive as in Example 1, two sets of partially polarized sandwich-shaped lenses as shown in FIG. 7B were fabricated. . The resulting partially polarized lenses all exhibit a uniform light blue color, and when two sets of lenses are stacked and one is rotated, the brightness and darkness repeat vividly every time one is rotated 90 degrees, causing distortions that interfere with polarization. was not recognized at all.
この発明は、金型のランナーＲ部分とキヤビテ
イＣ部分との間に、従来のゲートＧに代わつてバ
ツフアーゲートＢを設けることによつて、従来不
可能とされていた偏光プラスチツクレンズの製作
も可能とするような歪みのないレンズが容易に得
られるようになつたので、その意義はきわめて大
きいと言うことができる。
By providing a buffer gate B in place of the conventional gate G between the runner R portion and the cavity C portion of the mold, this invention enables the production of polarized plastic lenses, which was previously considered impossible. It can be said that this is of great significance because it has become possible to easily obtain lenses without distortion.
第１図はこの発明の２枚取り金型の構造を、そ
の金型によつて作られた樹脂成形物の構造によつ
て例示するための平面図、第２図は第１図の正面
図、第３図はこの発明の４枚取り金型の構造を樹
脂成形物の構造によつて例示するための平面図、
第４図はその正面図、第５図は第３図のＡ−Ａ断
面を示す断面図、第６図は従来の金型の主要構造
を樹脂成形物の構造によつて例示するための平面
図、第７図は実施例で作製した偏光レンズの平面
図でイは全面偏光の２重焦点レンズ、また、ロは
部分偏光の単一焦点レンズである。
Ｂ……バツフアーゲート、Ｃ……キヤビテイ、
Ｇ……ゲート、Ｒ……ランナー、Ｓ……スプル
ー、１……扇形ゲート、２……スリツト形ゲー
ト、３……円弧。
FIG. 1 is a plan view illustrating the structure of the two-cavity mold of the present invention by the structure of a resin molded product made with the mold, and FIG. 2 is a front view of FIG. 1. , FIG. 3 is a plan view for illustrating the structure of the four-cavity mold of the present invention by the structure of a resin molded product;
FIG. 4 is a front view thereof, FIG. 5 is a cross-sectional view taken along the line A-A in FIG. FIG. 7 is a plan view of the polarized lens produced in the example, in which A is a fully polarized bifocal lens, and B is a partially polarized single focus lens. B...Batsufua Gate, C...Cavity,
G...Gate, R...Runner, S...Sprue, 1...Sector gate, 2...Slit gate, 3...Circular arc.
Claims (1)
において、溶融された成形材料がスプルーから直
接もしくはランナーを経てレンズ成形用キヤビテ
イに入るゲート部分が、レンズ成形用キヤビテイ
の厚みとほぼ同等の厚みであり、かつ、径がレン
ズ成形用キヤビテイの径の0.4〜0.6倍である円形
平板状の空間であつて、この円形平板状の空間と
レンズ成形用キヤビテイとが、レンズ成形用キヤ
ビテイの円周の1/10から1/6の範囲の円弧を共有
した状態でオーバーラツプし、部分月食時の一部
侵食された月の映像のような形状を呈しているこ
とを特徴とするプラスチツクレンズ成形用金型。1. In injection molding and transfer molding molds, the gate portion through which the molten molding material enters the lens molding cavity directly from the sprue or through the runner has a thickness that is approximately the same as the thickness of the lens molding cavity; The space is a circular flat plate-like space whose diameter is 0.4 to 0.6 times the diameter of the lens molding cavity, and the circular flat plate-like space and the lens molding cavity are 1/1/1 of the circumference of the lens molding cavity. A mold for molding a plastic lens, characterized in that the molds overlap while sharing an arc in the range of 10 to 1/6, and have a shape similar to an image of a partially eroded moon during a partial lunar eclipse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15835984A JPS6135221A (en) | 1984-07-26 | 1984-07-26 | Molding die for plastic lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15835984A JPS6135221A (en) | 1984-07-26 | 1984-07-26 | Molding die for plastic lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6135221A JPS6135221A (en) | 1986-02-19 |
| JPH0218213B2 true JPH0218213B2 (en) | 1990-04-24 |
Family
ID=15669944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15835984A Granted JPS6135221A (en) | 1984-07-26 | 1984-07-26 | Molding die for plastic lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6135221A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345694A (en) * | 1989-07-14 | 1991-02-27 | Chuko Kasei Kogyo Kk | Sliding element |
| US5540410A (en) * | 1994-06-10 | 1996-07-30 | Johnson & Johnson Vision Prod | Mold halves and molding assembly for making contact lenses |
| US5545366A (en) * | 1994-06-10 | 1996-08-13 | Lust; Victor | Molding arrangement to achieve short mold cycle time and method of molding |
| JP2016147502A (en) * | 2016-05-16 | 2016-08-18 | 日本ゼオン株式会社 | Mold for molding optical lens and method for producing optical lens |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613139A (en) * | 1979-07-12 | 1981-02-09 | Wakayoshi Kogaku Kogyo Kk | Manufacture of plastic polarizing lens |
| JPS5849170A (en) * | 1981-08-10 | 1983-03-23 | ハロルド・コソフ | Electrically operated type swing |
-
1984
- 1984-07-26 JP JP15835984A patent/JPS6135221A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613139A (en) * | 1979-07-12 | 1981-02-09 | Wakayoshi Kogaku Kogyo Kk | Manufacture of plastic polarizing lens |
| JPS5849170A (en) * | 1981-08-10 | 1983-03-23 | ハロルド・コソフ | Electrically operated type swing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6135221A (en) | 1986-02-19 |
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