JPH0536657Y2 - - Google Patents
Info
- Publication number
- JPH0536657Y2 JPH0536657Y2 JP1988042907U JP4290788U JPH0536657Y2 JP H0536657 Y2 JPH0536657 Y2 JP H0536657Y2 JP 1988042907 U JP1988042907 U JP 1988042907U JP 4290788 U JP4290788 U JP 4290788U JP H0536657 Y2 JPH0536657 Y2 JP H0536657Y2
- Authority
- JP
- Japan
- Prior art keywords
- sprue
- mold
- punch
- protruding pin
- hole
- 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 18
- 239000011347 resin Substances 0.000 description 18
- 229920005989 resin Polymers 0.000 description 18
- 230000003287 optical effect Effects 0.000 description 16
- 239000000758 substrate Substances 0.000 description 16
- 238000001816 cooling Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Optical Record Carriers (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は主として光デイスク基板等の円板状成
形品を射出成形する金型に関し、特にその金型の
スプルーロツク構造に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention mainly relates to a mold for injection molding disc-shaped molded products such as optical disk substrates, and particularly to the sprue lock structure of the mold.
一般に、光デイスク基板等の円板状成形品の射
出成形におけるスプルーロツクの果たすべき挙動
としては、次のような事項を列挙することができ
る。
In general, the following matters can be enumerated as the behavior that a sprue lock should perform in injection molding of a disk-shaped molded product such as an optical disk substrate.
１ 型開時において、毎回シヨツトごとに必ず固
定側金型からスプルーを引き出し、可動側金型
に成形品を付着させること。1. When opening the mold, be sure to pull out the sprue from the stationary mold for each shot and attach the molded product to the movable mold.
２ スプルー突出時において、毎回シヨツトごと
に必ず円滑に可動側金型からスプルーを離すこ
とができること。その際、突出ピンから離脱し
てはならない。2. When projecting the sprue, it must be possible to smoothly separate the sprue from the movable mold for each shot. At that time, it must not come off the protruding pin.
３ 取出機のスプルーチヤツク時において、スプ
ルーが円滑に突出ピンから分離できること。3. The sprue must be able to be smoothly separated from the protruding pin when sprue chucking the unloading machine.
そこで、従来の金型におけるスプルーロツク
は、第４ａ，４ｂ図に示すように、金型１０１側
に形状的にアンダーカツト部１０２を作る手段
や、第５ａ，５ｂ図に示すように、突出ピン１０
３側にアンダーカツト部１０４を作り、これらア
ンダーカツト部１０２，１０４に引つ掛けること
により、上述した如き必要動作を得ていた。 Therefore, the sprue lock in the conventional mold has a means of forming an undercut portion 102 on the mold 101 side as shown in FIGS.
By forming an undercut portion 104 on the third side and hooking it to these undercut portions 102 and 104, the necessary operation as described above was obtained.
しかしながら、この場合には、次のような不具
合を有する。 However, this case has the following problems.
１ アンダーカツト部１０２，１０４が正常に機
能するよう保圧力や冷却時間さらには金型温度
などを制御するというスプルーロツクのための
スプルーの成形条件を考慮しなくてはならない
ため、最適な光デイスク基板の成形条件の選択
ができず、成形された光デイスク基板の品質の
低下を招く。1. It is necessary to consider the sprue molding conditions for the sprue lock, such as controlling the holding pressure, cooling time, and mold temperature so that the undercut parts 102 and 104 function properly, so it is necessary to find the optimal optical disk substrate. It is not possible to select the molding conditions, which leads to a decrease in the quality of the molded optical disk substrate.
２ スプルーを突出ピン及び可動側金型から離型
する際の無理が樹脂の削り屑を作り、その削り
屑が成形品や金型キヤビテイ面に付着し、光デ
イスク基板の次工程や次の成形に悪影響をおよ
ぼすことになる。2. The force of releasing the sprue from the ejecting pin and the movable mold creates resin shavings, which adhere to the molded product and mold cavity surface, causing damage to the next process of the optical disk substrate and the next molding. will have a negative impact on.
本考案は上述した如き事情に鑑み、保圧力や冷
却時間さらには金型温度などスプルーロツクのた
めのスプルーの成形条件に左右されることなく、
円板状成形品の品質向上が図れるとともに、樹脂
の削り屑が発生することのない円板状成形品成形
用金型のスプルーロツク構造を提供することにあ
る。
In view of the above-mentioned circumstances, the present invention has been developed without being influenced by the sprue forming conditions for sprue lock, such as holding pressure, cooling time, and mold temperature.
It is an object of the present invention to provide a sprue lock structure for a mold for molding a disc-shaped molded product, which can improve the quality of the disc-shaped molded product and does not generate resin shavings.
上記問題点を解決するための本考案は円板状成
形品成形用の金型において、固定側金型には円形
キヤビテイと同心にスプルーブツシユを設け、可
動側金型には前記スプルーブツシユと対向位置す
るポンチを設け、該ポンチには中心部に貫通孔を
設け、該貫通孔に進退可能な突出ピンを嵌挿入
し、該突出ピン先端部の外周と前記ポンチの貫通
孔との間には0.5mm以下の極めて薄い略均一厚さ
の筒状の薄肉空間部を形成してなることを特徴と
している。
In order to solve the above problems, the present invention is a mold for molding a disc-shaped product, in which a sprue bush is provided on the fixed side mold concentrically with the circular cavity, and the sprue bush is provided on the movable side mold. A punch is provided facing the punch, a through hole is provided in the center of the punch, a protruding pin that can move forward and backward is inserted into the through hole, and a gap between the outer periphery of the tip of the protruding pin and the through hole of the punch is provided. It is characterized by forming a thin cylindrical space having an extremely thin and substantially uniform thickness of 0.5 mm or less.
上記構成によれば、金型内に樹脂が射出される
と突出ピン先端部の外周とポンチの貫通孔との間
に形成された筒状の薄肉空間部内に樹脂が高圧充
填され、高圧のもとで樹脂が固化される。この固
化された高圧状態の樹脂がポンチの貫通孔先端部
及び突出ピン先端部に強く密着し、いわゆる表面
摩擦力によるスプルーロツク状態となる。次に金
型を型開きするとスプルーはスプルーロツクによ
り可動側金型に確実に付着して離型される。そし
て、突出ピンを突出すると突出ピンの突出力が前
記ロツク状態の摩擦力に打ち勝ち、薄肉筒状のス
プルーロツク部と前記貫通孔先端部とのロツク状
態が解放され、スプルーは突出ピン先端部を囲ん
だ状態で保持され、スプルーの取出しの際には無
理なくスプルーを突出ピンから引抜くことができ
る。このようにスプルーロツクを筒状の薄肉空間
部に充填した樹脂圧によつて行なうため、保圧力
や冷却時間などスプルーロツクのためのスプルー
の成形条件に左右されず円板成形品の成形ができ
る。しかもアンダーカツト部を形成する手段を用
いていないので、削り屑の発生もなくなつて、品
質の良い円板状成形品を得ることができる。
According to the above configuration, when the resin is injected into the mold, the thin cylindrical space formed between the outer periphery of the tip of the ejecting pin and the through hole of the punch is filled with the resin at high pressure, and the high pressure is also applied. The resin is solidified. This solidified high-pressure resin strongly adheres to the tip of the through hole of the punch and the tip of the protruding pin, creating a sprue lock state due to so-called surface friction force. Next, when the mold is opened, the sprue is securely attached to the movable mold by the sprue lock and released. Then, when the protrusion pin is protruded, the protrusion force of the protrusion pin overcomes the frictional force of the locked state, and the locked state between the thin-walled cylindrical sprue lock portion and the tip of the through hole is released, and the sprue surrounds the tip of the protrusion pin. When the sprue is taken out, the sprue can be pulled out from the protruding pin without any force. Since sprue locking is thus performed by the resin pressure filled in the cylindrical thin space, a disc molded product can be formed without being influenced by the sprue molding conditions for sprue locking, such as holding pressure and cooling time. Moreover, since no means for forming an undercut portion is used, there is no generation of shavings, and a disk-shaped molded product of good quality can be obtained.
以下、図面により本考案の一実施例として光デ
イスク基板成形用金型に応用したスプルーロツク
構造について説明すると、第１〜３図に示すよう
に、光デイスク基板１の成形用金型Ａは、固定側
金型２と可動側金型３とから成り、前記固定側金
型２にはスプルーブツシユ４を円形キヤビテイと
同心に嵌合し、スプルーブツシユ４は先端面が円
形キヤビテイに臨むところまで軸方向に摺動可能
に設けられている。前記可動側金型３には前記ス
プルーブツシユ４と対向位置する軸方向に進退可
能なポンチ５を嵌合し、該ポンチ５は中心部軸方
向に貫通孔６を形成し、該貫通孔６には軸方向に
摺動可能な突出ピン７が嵌合している。８は射出
ノズル９の先端から射出された溶融樹脂が通るス
プルーで、スプルーブツシユ４とポンチ５及び突
出ピン７とにより形成されている。
Hereinafter, a sprue lock structure applied to a mold for molding an optical disk substrate 1 will be explained as an embodiment of the present invention with reference to the drawings.As shown in FIGS. 1 to 3, the mold A for molding the optical disk substrate 1 is fixed Consisting of a side mold 2 and a movable mold 3, a sprue bush 4 is fitted into the fixed mold 2 concentrically with the circular cavity, and the sprue bush 4 is disposed until the end face faces the circular cavity. It is provided so as to be slidable in the axial direction. Fitted into the movable mold 3 is a punch 5 which is located opposite to the sprue bush 4 and is movable in the axial direction. A protruding pin 7 that is slidable in the axial direction is fitted into the. 8 is a sprue through which the molten resin injected from the tip of the injection nozzle 9 passes, and is formed by the sprue bush 4, the punch 5, and the protruding pin 7.
そして、前記ポンチ５の貫通孔６と突出ピン先
端部７ａとの間には0.5mm以下の極めて薄い略均
一厚さの筒状の薄肉空間部を形成している。な
お、該筒状の薄肉空間部は、前記貫通孔６の先端
部の径を大とするか（図２ｂ参照）または突出ピ
ン先端部７ａの径を小とする（図２ａ参照）こと
により前記突出ピン先端部７ａと貫通孔６との間
に形成される。 A cylindrical thin space having a substantially uniform thickness of 0.5 mm or less is formed between the through hole 6 of the punch 5 and the protruding pin tip 7a. The cylindrical thin space can be formed by increasing the diameter of the tip of the through hole 6 (see FIG. 2b) or by reducing the diameter of the protruding pin tip 7a (see FIG. 2a). It is formed between the protruding pin tip 7a and the through hole 6.
本考案の光デイスク基板形成用金型のスプルー
ロツク構造は上述の如く構成され、その作用は通
常の射出成形の場合と同様に固定側金型２と可動
側金型３を型閉じし、ノズル９を固定側金型２に
当接する。このノズル９の当接によりスプルーブ
ツシユ４をキヤビテイ面側へ押し、スプルー８と
キヤビテイを連通した後、溶融樹脂をキヤビテイ
内にノズル９より射出し、高圧状態で充填される
ことになる。 The sprue lock structure of the mold for forming an optical disk substrate of the present invention is constructed as described above, and its function is to close the fixed mold 2 and the movable mold 3 and open the nozzle 9 in the same way as in normal injection molding. is brought into contact with the stationary mold 2. This contact of the nozzle 9 pushes the sprue bushing 4 toward the cavity surface, establishing communication between the sprue 8 and the cavity, and then injecting molten resin into the cavity from the nozzle 9 to fill the cavity under high pressure.
次に、ポンチ５をキヤビテイ内に押出し、か
つ、これに同調してスプルーブツシユを後退させ
て固化しつつある光デイスク基板１の中央部に位
置するスプルーブツシユ４とポンチ５とにより挟
まれた中心部分であるスプルー８の打抜きを行
う。 Next, the punch 5 is pushed into the cavity, and in synchronization therewith the sprue bushing is retracted to punch out the sprue 8, which is the central portion of the solidifying optical disk substrate 1 sandwiched between the sprue bushing 4 and the punch 5.
そして、射出充填された樹脂の冷却に伴い突出
ピン先端部７ａを囲むように形成された略均一厚
さの薄肉筒状のスプルーロツク部１０は他の部分
に比べ極端に薄い（0.5mm以下）ため、射出時の
高い樹脂圧力を持続している間にこの圧力のもと
で樹脂は固化することになる。 As the injected and filled resin cools, the thin-walled cylindrical sprue lock part 10, which is formed to surround the protruding pin tip 7a and has a substantially uniform thickness, is extremely thin (0.5 mm or less) compared to other parts. , while maintaining the high resin pressure during injection, the resin will solidify under this pressure.
従つて、前述の高圧で射出充填された樹脂は冷
却にともなう収縮によつて樹脂圧が低下するもの
の、スプルーロツク部１０は高圧状態のまま固化
するので残圧としては大気圧以上の圧力があるた
め、スプルーロツク部１０内の樹脂は矢印Ｐ，Ｑ
で示すように突出ピン先端部７ａ外周面及びポン
チ５の貫通孔６内周面へそれぞれ強く押圧した状
態に保持され、この押圧力が突出ピン７、ポンチ
５と樹脂との表面の摩擦力となつてスプルー８は
ロツクされた状態となる（第３ａ図参照）。 Therefore, although the pressure of the resin injected and filled at high pressure decreases due to contraction as it cools, the sprue lock portion 10 solidifies in a high pressure state, so the residual pressure is higher than atmospheric pressure. , the resin inside the sprue lock part 10 is indicated by arrows P and Q.
As shown in , the protruding pin tip 7a is held in a state of being strongly pressed against the outer circumferential surface of the tip 7a and the inner circumferential surface of the through hole 6 of the punch 5, and this pressing force is combined with the frictional force between the protruding pin 7, the punch 5, and the resin surface. The sprue 8 is now locked (see Figure 3a).
そして、型開きを行い光デイスク基板１が可動
側金型３に付着して後退すると共に、スプルー８
は突出ピン先端部７ａとポンチ先端部５ａとにス
プルーロツクされた状態で固定側のスプルーブツ
シユ４から引抜くことができる。 Then, the mold is opened, and the optical disk substrate 1 adheres to the movable mold 3 and retreats, and the sprue 8
can be pulled out from the fixed sprue bush 4 while being sprue-locked to the protruding pin tip 7a and punch tip 5a.
次に、スプルーの突出時には、突出ピン７に右
側への移動力（矢印Ｒ）が加わり、この力がポン
チ５と樹脂との間の摩擦力に打勝ちスプルー８の
ポンチ５に対するロツク状態が解除されスプルー
８が図示右側へ突出されることになる（第３ｂ図
参照）。この時、スプルー８は突出ピン７を囲ん
だ状態で保持する把持力が残つているが、この把
持力はスプルー８のポンチ５に対するロツク状態
は解除されているため、それほど大きな力ではな
く、従つて、図示しない従来の取出機のスプルー
チヤツク力（矢印Ｓ）でスプルー８を十分に引抜
くことができる（第３ｃ図参照）。 Next, when the sprue is ejected, a rightward movement force (arrow R) is applied to the ejection pin 7, and this force overcomes the frictional force between the punch 5 and the resin, releasing the sprue 8 from the punch 5. As a result, the sprue 8 is projected to the right in the figure (see Figure 3b). At this time, the sprue 8 still has a gripping force to hold it in a state surrounding the protruding pin 7, but this gripping force is not so large because the sprue 8 is no longer locked to the punch 5, and the gripping force is not that large. Therefore, the sprue 8 can be sufficiently pulled out using the sprue chuck force (arrow S) of a conventional take-out machine (not shown) (see FIG. 3c).
このようにスプルーロツク構造が従来のような
アンダーカツトの形状によらずに必要動作を得ら
れるので、スプルーロツクのためのスプルー８の
成形のために各種の成形条件が左右されることが
なく最適な光デイスク基板１の成形条件を設定で
きるから光デイスク基板１の品質向上やコスト低
減が可能となる。また、従来のようなスプルー８
にアンダーカツトがないので、突出し取出しの際
に、樹脂の削り屑が発生しなくなるほか、取出機
による光デイスク基板の取出し終了まで、スプル
ー８は正確に突出ピン先端部７ａに固定されてい
ることになるので、成形不良のない安定した光デ
イスク基板の成形を行なうことができるという利
点がある。 In this way, the sprue lock structure can obtain the necessary movement without depending on the shape of the undercut as in the past, so the various molding conditions for forming the sprue 8 for the sprue lock are not affected, and the optimum light can be achieved. Since the molding conditions for the disk substrate 1 can be set, it is possible to improve the quality and reduce the cost of the optical disk substrate 1. In addition, the conventional sprue 8
Since there is no undercut, no resin shavings are generated when ejecting the sprue 8, and the sprue 8 is accurately fixed to the ejecting pin tip 7a until the ejecting machine finishes ejecting the optical disk board. Therefore, there is an advantage that stable optical disk substrate molding without molding defects can be performed.
本考案の円板状成形品成形用金型のスプルーロ
ツク構造は以上の如き構成としたものであるか
ら、従来のようにスプルーロツクのためのアンダ
ーカツト部等を形成することがないのでスプルー
が保圧力や冷却時間さらには金型温度などの成形
条件に影響を及ぼすことがなく、円板状成形品の
最適成形条件を選択できるから円板状成形品の品
質向上を図ることができ、かつ、従来のようにポ
ンチや突出ピン等にアンダーカツトを設けないの
で、樹脂の削り屑の発生も完全になくすことがで
きる。
Since the sprue lock structure of the mold for molding a disc-shaped molded product of the present invention is constructed as described above, there is no need to form an undercut portion for the sprue lock as in the conventional method, so that the sprue has a retaining force. The quality of disc-shaped molded products can be improved because the optimal molding conditions for disc-shaped molded products can be selected without affecting molding conditions such as mold temperature, cooling time, or mold temperature. Since there is no undercut in the punch or ejecting pin, the generation of resin shavings can be completely eliminated.
依つて、実用性に優れた円板状成形品成形用金
型のスプルーロツク構造を提供できる。 Therefore, it is possible to provide a sprue lock structure for a mold for forming a disc-shaped molded product that is highly practical.
第１図は本考案の一実施例としての光デイスク
基板成形用金型のスプルーロツク構造を示す概略
断面図、第２ａ図はその要部拡大断面図、第２ｂ
は他の実施例の要部拡大断面図、第３ａ図は第２
図の射出成形中及び型開時の状態を示す要部拡大
断面図、第３ｂ図は第２図の突出時の状態を示す
要部拡大断面図、第３ｃ図は第２図の取出機がス
プルーチヤツクで成形品を引抜いた状態を示す要
部拡大断面図であり、第４ａ，ｂ図及び第５ａ，
ｂ図は従来の円板成形用金型のスプルーロツク構
造を示す概略図である。
１……光デイスク基板、２……固定側金型、３
……可動側金型、４……スプルーブツシユ、５…
…ポンチ、５ａ……ポンチ先端部、６……貫通
孔、７……突出ピン、７ａ……突出ピン先端部、
８……スプルー、９……ノズル、１０……スプル
ーロツク部、Ａ……光デイスク基板成形用金型。
Fig. 1 is a schematic sectional view showing the sprue lock structure of a mold for molding an optical disk substrate as an embodiment of the present invention, Fig. 2a is an enlarged sectional view of the main part thereof, and Fig. 2b
3a is an enlarged sectional view of main parts of another embodiment, and FIG.
Fig. 3b is an enlarged sectional view of the main part showing the state during injection molding and when the mold is opened, Fig. 3b is an enlarged sectional view of the main part showing the state during ejection of Fig. 2, and Fig. 3c is the ejection machine of Fig. 2. FIG. 4 is an enlarged cross-sectional view of the main part showing a state in which the molded product is pulled out with a sprue chuck; FIGS.
Figure b is a schematic diagram showing the sprue lock structure of a conventional disc mold. 1... Optical disk substrate, 2... Fixed side mold, 3
...Movable side mold, 4...Sprue bush, 5...
...Punch, 5a...Punch tip, 6...Through hole, 7...Protruding pin, 7a...Protruding pin tip,
8...Sprue, 9...Nozzle, 10...Sprue lock portion, A...Mold for molding optical disk substrate.
Claims (1)
型には円形キヤビテイと同心にスプルーブツシユ
を設け、可動側金型には前記スプルーブツシユと
対向位置するポンチを設け、該ポンチには中心部
に貫通孔を設け、該貫通孔に進退可能な突出ピン
を嵌挿入し、該突出ピン先端部の外周と前記ポン
チの貫通孔との間には0.5mm以下の極めて薄い略
均一厚さの筒状の薄肉空間部を形成してなること
を特徴とする円板状成形品成形用金型のスプルー
ロツク構造。 In a mold for molding a disc-shaped product, a sprue bush is provided on the fixed side mold concentrically with the circular cavity, a punch is provided on the movable side mold and located opposite to the sprue bush, and the punch is provided with a sprue bush concentrically with the circular cavity. A through hole is provided in the center, a protruding pin that can move forward and backward is inserted into the through hole, and an extremely thin, approximately uniform thickness of 0.5 mm or less is provided between the outer periphery of the tip of the protruding pin and the through hole of the punch. A sprue lock structure for a mold for forming a disc-shaped molded product, which is characterized by forming a cylindrical thin-walled space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988042907U JPH0536657Y2 (en) | 1988-04-01 | 1988-04-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988042907U JPH0536657Y2 (en) | 1988-04-01 | 1988-04-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01146921U JPH01146921U (en) | 1989-10-11 |
| JPH0536657Y2 true JPH0536657Y2 (en) | 1993-09-16 |
Family
ID=31269309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988042907U Expired - Lifetime JPH0536657Y2 (en) | 1988-04-01 | 1988-04-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0536657Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858214A (en) * | 1981-10-02 | 1983-04-06 | Mitsubishi Motors Corp | Manufacture of compacted vermicular graphite cast iron |
-
1988
- 1988-04-01 JP JP1988042907U patent/JPH0536657Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858214A (en) * | 1981-10-02 | 1983-04-06 | Mitsubishi Motors Corp | Manufacture of compacted vermicular graphite cast iron |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01146921U (en) | 1989-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2642158B2 (en) | Mold for optical disk substrate molding | |
| US5330693A (en) | Process and apparatus for injection-molding product having minute surface pattern and central hole | |
| JPH0295819A (en) | Injection mold of optical disc board | |
| US7396575B2 (en) | Molding die apparatus, method for disc substrate, and disc-shaped recording medium | |
| JP2824486B2 (en) | Molding equipment for optical disks, etc. | |
| JP2995722B2 (en) | Mold equipment | |
| US5106553A (en) | Method for molding a formatted substrate for an optical disk | |
| JPH0536657Y2 (en) | ||
| JP3371224B2 (en) | Air blow method for disk molding die and its die | |
| JPWO2004045822A1 (en) | Mold for molding, molding method, disk substrate and molding machine | |
| JP2582420B2 (en) | Mold for optical disk substrate molding | |
| JPH0375022B2 (en) | ||
| JP2630606B2 (en) | Molding equipment for optical disks, etc. | |
| JPH0890613A (en) | Disk-molding die | |
| JP3240379B2 (en) | Disc injection molding apparatus and disc injection molding method | |
| JPH10286846A (en) | Molding device of disc molded article | |
| JP2002283405A (en) | Mold assembly for molding optical disk | |
| JPH07329121A (en) | Mold of optical disk and molding of optical disk substrate | |
| JPH07156218A (en) | Mold for optical disk substrate and molding method | |
| JP2005028782A (en) | Method for producing resin substrate and injection molding machine for the substrate | |
| JP2514868B2 (en) | Injection mold for molding information recording board | |
| JP3105072B2 (en) | Manufacturing method of disk substrate | |
| JPH08238649A (en) | Mold and method for molding disk substrate | |
| JP3346805B2 (en) | Disc molding die | |
| JPH04336218A (en) | Mold |