JPH0939054A - Method and apparatus for manufacture of information recording medium - Google Patents
Method and apparatus for manufacture of information recording mediumInfo
- Publication number
- JPH0939054A JPH0939054A JP21283295A JP21283295A JPH0939054A JP H0939054 A JPH0939054 A JP H0939054A JP 21283295 A JP21283295 A JP 21283295A JP 21283295 A JP21283295 A JP 21283295A JP H0939054 A JPH0939054 A JP H0939054A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- resin
- mold part
- information recording
- recording medium
- 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.)
- Pending
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
- B29C45/76—Measuring, controlling or regulating
- B29C45/80—Measuring, controlling or regulating of relative position of mould parts
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、射出圧縮成形によ
り製造される光ディスクなどの情報記録媒体の製造方法
及び製造装置に関し、特にディスク状の基板の製造方法
及び製造装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and a manufacturing apparatus for an information recording medium such as an optical disk manufactured by injection compression molding, and more particularly to a manufacturing method and a manufacturing apparatus for a disk-shaped substrate.
【０００２】[0002]
【従来の技術】近年、光ディスクなどの情報記録媒体
は、高密度、大容量、小型化を図るための開発が進めら
れている。この光ディスクなどの情報記録媒体の基板の
製造方法の１つで、材料としてポリカーボネート樹脂を
用い、射出成形機による射出圧縮成形法が行われる。こ
の方法を図２を参照して説明すると、射出成形機に取り
付けられている金型は固定型部１ａと、この固定型部１
ａに対して基板用の空洞を隔てて対向する可動型部１ｂ
により構成され、信号マーク（ピット）が形成されたス
タンパ７を固定型部１ａ又は可動型部１ｂ（図では固定
型部１ａ）に取り付け、図の矢印方向から図３に示すよ
うな射出機構部３から溶融樹脂６を高速充填することに
よりスタンパ７のピットを樹脂６に転写し、樹脂６が固
化した後、金型１（１ａ、１ｂ）を開くことにより基板
を取り出す。2. Description of the Related Art In recent years, information recording media such as optical disks have been under development for higher density, larger capacity and smaller size. In one of the methods of manufacturing a substrate of an information recording medium such as an optical disk, a polycarbonate resin is used as a material, and an injection compression molding method is performed by an injection molding machine. This method will be described with reference to FIG. 2. The mold attached to the injection molding machine includes a fixed mold portion 1a and a fixed mold portion 1a.
Movable mold part 1b facing a by a substrate cavity.
A stamper 7 having a signal mark (pit) formed thereon is attached to a fixed mold part 1a or a movable mold part 1b (fixed mold part 1a in the figure), and an injection mechanism part as shown in FIG. The pits of the stamper 7 are transferred to the resin 6 by filling the molten resin 6 from 3 at a high speed, and after the resin 6 is solidified, the mold 1 (1a, 1b) is opened to take out the substrate.
【０００３】従来、このときの型閉め力は、樹脂６の充
填圧力で金型１（１ａ、１ｂ）が適度に開く圧力に制御
し、樹脂の充填後に充填圧力が減少した場合に充填圧力
より型閉め力が増すことよりスタンパ７のピットを樹脂
６に転写するようにしている。Conventionally, the mold closing force at this time is controlled so that the mold 1 (1a, 1b) is opened appropriately by the filling pressure of the resin 6, and when the filling pressure is decreased after the resin is filled, the mold closing force is more than the filling pressure. The pits of the stamper 7 are transferred to the resin 6 by increasing the mold closing force.
【０００４】また、樹脂６を金型１内に充填させる場
合、図３に示すような射出機構部３では、溶融された樹
脂６が計量工程においてスクリュー３ａの前で留まり、
これをスクリュー３ａを押すことにより行う。また、そ
の制御は図４に示すように、スクリュー３ａの位置と速
度で制御する射出工程と、圧力と時間で制御する保圧工
程の２段階で行っている。When the resin 6 is filled in the mold 1, the molten resin 6 stays in front of the screw 3a in the measuring process in the injection mechanism 3 as shown in FIG.
This is done by pushing the screw 3a. Further, as shown in FIG. 4, the control is performed in two stages of an injection step of controlling the position and speed of the screw 3a and a pressure holding step of controlling the pressure and time.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、樹脂６
を充填する制御を速度、圧力、時間で行う方法では、速
度と圧力が樹脂６の溶融状態で異なるので、金型１の開
量がばらつき、その結果、情報記録媒体の厚みのバラツ
キが大きいという問題点がある。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the method of performing the filling control by speed, pressure, and time, since the speed and pressure differ depending on the molten state of the resin 6, the opening amount of the mold 1 varies, and as a result, the variation in the thickness of the information recording medium is large. There is a problem.
【０００６】本発明は上記従来の問題点に鑑み、樹脂の
溶融状態にかかわらず情報記録媒体の厚みのバラツキを
防止することができる情報記録媒体の製造方法及び製造
装置を提供することを目的とする。In view of the above conventional problems, it is an object of the present invention to provide a method and an apparatus for manufacturing an information recording medium capable of preventing the thickness variation of the information recording medium regardless of the molten state of the resin. To do.
【０００７】[0007]
【課題を解決するための手段】本発明は上記目的を達成
するために、型締め機構により締められた固定型部と移
動型部の開量を検出し、この開量に基づいて型締め機構
の型締め力と射出機構による射出の終了のタイミングの
少なくとも一方を制御するようにしている。すなわち、
本発明によれば、型締め力が制御可能な固定型部と移動
型部を有し、前記固定型部と移動型部の間に樹脂を充填
することにより情報記録媒体を成形するための金型と、
前記金型の固定型部と移動型部を可変の型締め力で締め
る型締め機構と、前記金型内に樹脂を射出する射出機構
により情報記録媒体を製造する方法であって、前記射出
機構により樹脂が金型内に射出されている場合に前記型
締め機構により締められた固定型部と移動型部の開量を
検出し、この開量に基づいて前記型締め機構の型締め力
と前記射出機構による射出の終了のタイミングの少なく
とも一方を制御することを特徴とする情報記録媒体の製
造方法が提供される。また、本発明によれば、型締め力
が制御可能な固定型部と移動型部を有し、前記固定型部
と移動型部の間に樹脂を充填することにより情報記録媒
体を成形するための金型と、前記金型の固定型部と移動
型部を可変の型締め力で締める型締め機構と、前記型締
め機構により締められた固定型部と移動型部の開量を検
出する開量検出手段と、前記金型内に樹脂を射出する射
出機構と、前記射出機構により樹脂が金型内に射出され
ている場合に前記開量検出手段により検出された開量に
基づいて前記型締め機構の型締め力と前記射出機構によ
る射出の終了のタイミングの少なくとも一方を制御する
制御手段とを有する情報記録媒体の製造装置が提供され
る。In order to achieve the above object, the present invention detects the opening amount of a fixed mold part and a movable mold part that are clamped by a mold clamping mechanism, and based on this opening amount, the mold clamping mechanism. At least one of the mold clamping force and the timing of ending the injection by the injection mechanism is controlled. That is,
According to the present invention, a metal mold for molding an information recording medium is provided which has a fixed mold part and a movable mold part whose mold clamping force can be controlled, and which is filled with resin between the fixed mold part and the movable mold part. Type,
A method for manufacturing an information recording medium by a mold clamping mechanism for clamping a fixed mold part and a movable mold part of the mold with a variable mold clamping force, and an injection mechanism for injecting resin into the mold, the injection mechanism Detects the opening amount of the fixed mold part and the movable mold part that are clamped by the mold clamping mechanism when the resin is injected into the mold, and the mold clamping force of the mold clamping mechanism is determined based on this opening amount. There is provided a method for manufacturing an information recording medium, characterized in that at least one of the timings of ending the ejection by the ejection mechanism is controlled. Further, according to the present invention, there is provided a fixed mold part and a movable mold part whose mold clamping force is controllable, and for molding an information recording medium by filling a resin between the fixed mold part and the movable mold part. Of the mold, a mold clamping mechanism for clamping the fixed mold part and the movable mold part of the mold with a variable mold clamping force, and an opening amount of the fixed mold part and the movable mold part clamped by the mold clamping mechanism. The opening amount detecting means, an injection mechanism for injecting resin into the mold, and the opening amount detected by the opening amount detecting means when resin is injected into the mold by the injection mechanism. Provided is an apparatus for manufacturing an information recording medium, which has a mold clamping force of a mold clamping mechanism and a control means for controlling at least one of the timing of ending the injection by the injection mechanism.
【０００８】[0008]
【発明の実施の形態】以下、図面を参照して本発明の情
報記録媒体の製造方法及び製造装置の実施の形態を実施
例により説明する。図１は本発明に係る情報記録媒体の
製造方法及び製造装置の一実施例として射出成形機を示
す概略構成図、図２は図１の金型を詳細に示す構成図、
図３は図１の射出機構部を詳細に示す構成図である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method and an apparatus for manufacturing an information recording medium according to the present invention will be described below with reference to the drawings. 1 is a schematic configuration diagram showing an injection molding machine as one embodiment of a method and an apparatus for producing an information recording medium according to the present invention, and FIG. 2 is a configuration diagram showing in detail the mold of FIG.
FIG. 3 is a detailed configuration diagram of the injection mechanism unit of FIG.
【０００９】図１において、この射出成形機は図２に示
すように型締め力が制御可能な固定型部１ａ及び可動型
部１ｂを有し、空洞内にスタンパ１０が取り付けられる
金型１と、固定型部１ａ及び可動型部１ｂを可変の型締
め力で締める型閉め機構部２と、図３に示すように溶融
された樹脂６をスクリュー３ａにより金型１内に充填さ
せるための射出機構部３と、金型１の固定型部１ａ及び
可動型部１ｂの開量を検出する型開センサ４を有する。In FIG. 1, this injection molding machine has a fixed mold part 1a and a movable mold part 1b whose mold clamping force can be controlled as shown in FIG. 2, and a mold 1 in which a stamper 10 is mounted in a cavity. , A mold closing mechanism part 2 for tightening the fixed mold part 1a and the movable mold part 1b with a variable mold clamping force, and injection for filling the molten resin 6 into the mold 1 by the screw 3a as shown in FIG. It has a mechanism part 3 and a mold opening sensor 4 for detecting the opening amount of the fixed mold part 1a and the movable mold part 1b of the mold 1.
【００１０】本発明では、型開センサ４により検出され
た開量に基づいて型閉め機構部２の型閉め力と射出機構
部３の樹脂充填の終了のタイミングをそれぞれフィード
バック制御するサーボバルブ（ＳＶ）５ａ、５ｂを有
し、射出機構部３から金型１内に樹脂６が充填されてい
る状態で金型１が開き、型開センサ４により所定の開量
になったことが検出されたときに、型閉め機構部２の型
閉め力と射出機構部３の樹脂充填がそれぞれサーボバル
ブ（ＳＶ）５ａ、５ｂにより制御される。In the present invention, a servo valve (SV) for feedback controlling the mold closing force of the mold closing mechanism 2 and the timing of the resin filling of the injection mechanism 3 based on the opening amount detected by the mold opening sensor 4 is used. ) 5a and 5b, the mold 1 is opened in a state where the resin 6 is filled in the mold 1 from the injection mechanism section 3, and it is detected by the mold opening sensor 4 that a predetermined opening amount has been reached. At this time, the mold closing force of the mold closing mechanism 2 and the resin filling of the injection mechanism 3 are controlled by the servo valves (SV) 5a and 5b, respectively.
【００１１】なお金型の開量とは固定型部１ａと可動型
部１ｂの間のパーティングラインにおける両者間の距離
である。この開量は、例えば１．２ｍｍ厚のディスクの
場合、射出開始特に１．２ｍｍより例えば８０μｍ少な
い値に設定される。樹脂が射出されると、キャビティー
内圧力が高まり、開量が１．２ｍｍより例えば２０μｍ
増加した値、すなわち、移動量が１００μｍ（０．１ｍ
ｍ）となったとき後述の所定の制御が行われる。なおこ
れらの数値は１例であり、使用樹脂や、型閉め力などの
条件により変化する。The opening amount of the money mold is the distance between the fixed mold portion 1a and the movable mold portion 1b in the parting line. For example, in the case of a disc having a thickness of 1.2 mm, the opening amount is set to a value that is 80 μm less than 1.2 mm from the start of injection, in particular. When the resin is injected, the pressure inside the cavity rises, and the opening is 1.2 mm, for example 20 μm.
The increased value, that is, the amount of movement is 100 μm (0.1 m
When it becomes m), predetermined control described later is performed. It should be noted that these numerical values are only examples, and change depending on conditions such as the resin used and the mold closing force.
【００１２】[0012]
【表１】具体例を説明すると、 成形樹脂：ポリカーボネート（平均分子量１５０００） 樹脂温度：３５０°Ｃ 金型温度：１１５°Ｃ 樹脂充填時の型閉め力：１．５＊１０5 Ｎ 最大射出速度：１００ｍｍ／ｓ とし、下記（１）〜（４）に示す４つの方法で各１００
枚のディスク状情報記録媒体（内径φ１５ｍｍ、外径１
２０ｍｍ、厚み１．２ｍｍ）を作成し、同一ポイントの
厚みバラツキを調べた（表３）。[Table 1] Explaining specific examples, molding resin: polycarbonate (average molecular weight 15000) Resin temperature: 350 ° C Mold temperature: 115 ° C Mold closing force during resin filling: 1.5 * 10 5 N Maximum injection speed : 100 mm / s and 100 by each of the four methods shown in (1) to (4) below.
One disc-shaped information recording medium (inner diameter 15 mm, outer diameter 1
20 mm, thickness 1.2 mm) was prepared and the thickness variation at the same point was examined (Table 3).
【００１３】[0013]
【表２】 （１）従来の方法（型閉め力は、樹脂６の充填圧力で金
型１（１ａ、１ｂ）が適度に開く圧力に制御し、樹脂の
充填後に充填圧力が減少した場合に充填圧力より型閉め
力が増すことよりスタンパ１０のピットを樹脂６に転写
する。） （２）型開センサ４により所定の開量になったときに型
閉め力を３．０＊１０5Ｎに上げる方法 （３）型開センサ４により所定の開量になったときに射
出を止める方法 （４）型開センサ４により所定の開量になったときに型
閉め力を３．０＊１０5Ｎに上げるとともに射出を止め
る方法[Table 2] (1) Conventional method (the mold closing force is controlled when the mold 1 (1a, 1b) is appropriately opened by the filling pressure of the resin 6 and the filling pressure is decreased after the resin is filled. The pit of the stamper 10 is transferred to the resin 6 by increasing the mold closing force from the filling pressure.) (2) The mold closing force is 3.0 * 10 5 N when the predetermined opening amount is obtained by the mold opening sensor 4. (3) Method to stop injection when the mold opening sensor 4 reaches a predetermined opening amount (4) A mold closing force of 3.0 * 10 when the mold opening sensor 4 reaches a predetermined opening amount way to stop injection with raised to 5 N
【００１４】[0014]
【表３】 [Table 3]
【００１５】表３に示すように、方法（２）〜（４）は
従来の方法（１）より同一ポイントの厚みバラツキが小
さく、特に方法（４）が最もバラツキが小さかった。な
お、上記テストでは、射出成形機として（株）日本製鋼
所製Ｊ５０ＤＫを、型開センサ４として（株）小野測器
製リニア ゲージ センサ（ＧＳ−１１２）を用いた
が、同仕様のものなら他のメーカのものでもよい。ま
た、型開センサ４は図１では金型１の側面に取り付けた
が、金型１の開量を検出できればどの取付け位置でもよ
い。As shown in Table 3, in the methods (2) to (4), the variation in thickness at the same point was smaller than that in the conventional method (1), and the variation in the method (4) was the smallest. In the above test, J50DK manufactured by Japan Steel Works, Ltd. was used as the injection molding machine, and Linear Gauge Sensor (GS-112) manufactured by Ono Sokki Co., Ltd. was used as the mold opening sensor 4. It may be from another manufacturer. Further, although the mold opening sensor 4 is attached to the side surface of the mold 1 in FIG. 1, it may be attached at any mounting position as long as the opening amount of the mold 1 can be detected.
【００１６】[0016]
【発明の効果】以上説明したように本発明によれば、型
締め機構により締められた固定型部と移動型部の開量を
検出し、この開量に基づいて型締め機構の型締め力と射
出機構による射出の終了タイミングの少なくとも一方を
制御するので、樹脂を充填する速度と圧力が樹脂の溶融
状態で異なる場合の金型の開量のばらつきにかかわらず
情報記録媒体の厚みのバラツキを防止することができ
る。As described above, according to the present invention, the opening amounts of the fixed mold part and the movable mold part that are clamped by the mold clamping mechanism are detected, and the mold clamping force of the mold clamping mechanism is detected based on the detected opening amount. Since at least one of the end timing of the injection by the injection mechanism and the injection mechanism is controlled, the variation in the thickness of the information recording medium is caused regardless of the variation in the opening amount of the mold when the resin filling speed and the pressure are different depending on the molten state of the resin. Can be prevented.
【図１】本発明に係る情報記録媒体の製造方法及び製造
装置の一実施例として射出成形機を示す概略構成図であ
る。FIG. 1 is a schematic configuration diagram showing an injection molding machine as one embodiment of a method and an apparatus for manufacturing an information recording medium according to the present invention.
【図２】図１の金型を詳細に示す構成図である。FIG. 2 is a configuration diagram showing the mold of FIG. 1 in detail.
【図３】図１の射出機構部を詳細に示す構成図である。FIG. 3 is a configuration diagram showing in detail the injection mechanism section of FIG.
【図４】従来の情報記録媒体の製造方法を示す説明図で
ある。FIG. 4 is an explanatory diagram showing a conventional method for manufacturing an information recording medium.
１ 金型 １ａ 固定型部 １ｂ 可動型部 ２ 型締め機構部 ３ 射出機構部 ３ａ スクリュー ４ 型開センサ（開量検出手段） ５ａ，５ｂ サーボバルブ（制御手段） ６ 樹脂 ７ スタンパ 1 mold 1a fixed mold part 1b movable mold part 2 mold clamping mechanism part 3 injection mechanism part 3a screw 4 mold open sensor (opening amount detection means) 5a, 5b servo valve (control means) 6 resin 7 stamper
Claims (2)
部を有し、前記固定型部と移動型部の間に樹脂を充填す
ることにより情報記録媒体を成形するための金型と、前
記金型の固定型部と移動型部を可変の型締め力で締める
型締め機構と、前記金型内に樹脂を射出する射出機構に
より情報記録媒体を製造する方法であって、 前記射出機構により樹脂が金型内に射出されている場合
に前記型締め機構により締められた固定型部と移動型部
の開量を検出し、この開量に基づいて前記型締め機構の
型締め力と前記射出機構による射出の終了のタイミング
の少なくとも一方を制御することを特徴とする情報記録
媒体の製造方法。1. A mold for molding an information recording medium, comprising a fixed mold part and a movable mold part whose mold clamping force is controllable, and filling a resin between the fixed mold part and the movable mold part. A method for manufacturing an information recording medium by a mold clamping mechanism for clamping a fixed mold part and a movable mold part of the mold with a variable mold clamping force, and an injection mechanism for injecting a resin into the mold, wherein When the resin is injected into the mold by the injection mechanism, the opening amount of the fixed mold part and the movable mold part that are clamped by the mold clamping mechanism is detected, and the mold clamping of the mold clamping mechanism is performed based on this opening amount. A method for manufacturing an information recording medium, comprising controlling at least one of a force and a timing of ending ejection by the ejection mechanism.
部を有し、前記固定型部と移動型部の間に樹脂を充填す
ることにより情報記録媒体を成形するための金型と、 前記金型の固定型部と移動型部を可変の型締め力で締め
る型締め機構と、 前記型締め機構により締められた固定型部と移動型部の
開量を検出する開量検出手段と、 前記金型内に樹脂を射出する射出機構と、 前記射出機構により樹脂が金型内に射出されている場合
に前記開量検出手段により検出された開量に基づいて前
記型締め機構の型締め力と前記射出機構による射出の終
了のタイミングの少なくとも一方を制御する制御手段と
を有する情報記録媒体の製造装置。2. A mold for molding an information recording medium, comprising a fixed mold part and a movable mold part whose mold clamping force is controllable, and filling a resin between the fixed mold part and the movable mold part. And a mold clamping mechanism for clamping the fixed mold part and the movable mold part of the mold with a variable mold clamping force, and an opening amount detection for detecting an opening amount of the fixed mold part and the movable mold part clamped by the mold clamping mechanism. Means, an injection mechanism for injecting resin into the mold, and the mold closing mechanism based on the opening amount detected by the opening amount detection means when the resin is injected into the mold by the injection mechanism. An apparatus for manufacturing an information recording medium, comprising: a mold clamping force; and a control unit that controls at least one of the timing of ending the ejection by the ejection mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21283295A JPH0939054A (en) | 1995-07-28 | 1995-07-28 | Method and apparatus for manufacture of information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21283295A JPH0939054A (en) | 1995-07-28 | 1995-07-28 | Method and apparatus for manufacture of information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0939054A true JPH0939054A (en) | 1997-02-10 |
Family
ID=16629101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21283295A Pending JPH0939054A (en) | 1995-07-28 | 1995-07-28 | Method and apparatus for manufacture of information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0939054A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015182266A (en) * | 2014-03-24 | 2015-10-22 | 日精樹脂工業株式会社 | Injection machine control method |
-
1995
- 1995-07-28 JP JP21283295A patent/JPH0939054A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015182266A (en) * | 2014-03-24 | 2015-10-22 | 日精樹脂工業株式会社 | Injection machine control method |
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