JPS63251982A - Composite hub for optical disk - Google Patents
Composite hub for optical diskInfo
- Publication number
- JPS63251982A JPS63251982A JP62086099A JP8609987A JPS63251982A JP S63251982 A JPS63251982 A JP S63251982A JP 62086099 A JP62086099 A JP 62086099A JP 8609987 A JP8609987 A JP 8609987A JP S63251982 A JPS63251982 A JP S63251982A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- resin
- optical disk
- constituting
- substrate
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 23
- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000004417 polycarbonate Substances 0.000 claims abstract description 12
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 abstract description 8
- 239000003607 modifier Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 125000005396 acrylic acid ester group Chemical group 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004419 Panlite Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光ディスク用コンポジットハブに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a composite hub for optical discs.
従来、光ディスク用ハブとしては金属を材質とするもの
が知られており、斯かる金属ハブを直接光ディスク基板
に取り付けるのは、接着剤を使用したり、ネジ化めする
等の方法により行われていた。ところがこの場合、取り
付は後、駆動装置内での温度上昇によって、光ディスク
の複屈折が増加するという問題があった。Conventionally, hubs for optical disks have been known to be made of metal, and such metal hubs have been attached directly to optical disk substrates using methods such as using adhesive or screwing. Ta. However, in this case, there is a problem in that birefringence of the optical disk increases due to temperature rise within the drive device after installation.
そこで、上記の問題点を解決するべく光ディスクの基板
材料、即ちポリカーボネート、メチルメタアクリレート
などの樹脂と金属板とのコンポジットハブが提案された
。しかし、例えばポリカーボネートと金属板とのコンポ
ジットハブは、成形後の冷却によるポリカーボネートと
金属板との熱収縮率の相異により、ハブの変形やクラッ
クの発生が起こり、実用上問題になっている。Therefore, in order to solve the above-mentioned problems, a composite hub of a metal plate and the substrate material of the optical disk, ie, a resin such as polycarbonate or methyl methacrylate, has been proposed. However, for example, in a composite hub of polycarbonate and a metal plate, the hub deforms and cracks occur due to the difference in thermal shrinkage rate between the polycarbonate and the metal plate when cooled after molding, which poses a practical problem.
上記問題点に鑑み、本発明者等は鋭意研究を重ねた結果
、ハブに用いる樹脂として、光ディスク基板材料と同種
の材質、例えばポリカーボネートを主体とし、これにエ
ラスティックな改質材として多投重合体をブレンドした
ものを使用すると、金属板と樹脂との熱収縮率の差によ
り生じるハブ内の応力が改質材により吸収され、ハブの
変形やクラックの発生を未然に防止できることを見出し
、本発明を完成するに至った。In view of the above problems, the inventors of the present invention have conducted intensive research and have found that the resin used for the hub is mainly made of the same material as the optical disk substrate material, such as polycarbonate, and is coated with multiple layers of elastic modifier. We discovered that by using a blend of composite materials, the stress within the hub caused by the difference in thermal contraction rate between the metal plate and the resin can be absorbed by the modified material, preventing deformation and cracking of the hub. The invention was completed.
即ち、本発明は金属板を内蔵した樹脂成形物よりなる光
ディスク用コンポジットハブにおいて、該樹脂が光ディ
スク基板を構成する樹脂と同種のベース樹脂に対して３
〜３０重量％の多段重合体をブレンドしてなるものであ
ることを特徴とする光ディスク用コンポジットハブを提
供するものである。That is, the present invention provides a composite hub for an optical disc made of a resin molded product with a built-in metal plate, in which the resin has a 3.
The present invention provides a composite hub for an optical disc, characterized in that it is made by blending up to 30% by weight of a multistage polymer.
一般に光ディスク基板としては、成形品の剛性や光学的
異方性が小さいことが要求され、ポリカーボネートやポ
リメチルメタアクリレート等が用いられている。Generally, optical disc substrates are required to have low rigidity and low optical anisotropy, and polycarbonate, polymethyl methacrylate, and the like are used.
本発明のコンポジットハブは、樹脂成分として前記の理
由から、光ディスク基板と同質の樹脂、即ちポリカーボ
ネート等を主体とし、更に改質材として多段共重合体を
配合してなる。For the reasons mentioned above, the composite hub of the present invention mainly contains a resin of the same quality as the optical disc substrate, such as polycarbonate, as a resin component, and further contains a multistage copolymer as a modifier.
ここで、多投重合体としては、アクリル酸エステル、メ
タクリル酸エステルを主成分とし、２段以上の重合過程
から得られるもの、より具体的にはアクリル酸エステル
やブタジェンを主成分とする単量体を乳化重合しておき
、その後スチレン系単量体、アクリロニトリルもしくは
メチルメタクリレートのそれぞれの単独乃至は混合系の
単量体を加えグラフト共重合させることにより得られる
もの等が挙げられる。その際、スチレン系単量体、アク
リロニトリルもしくはメチルメタクリレートなどの単独
乃至は混合系単量体を乳化重合しそれにエラストマー成
分を添加し重合した後、更に第一段の成分系の単量体を
グラフト共重合させたものも用いることができる。Here, the multi-polymer is a polymer mainly composed of acrylic acid ester or methacrylic acid ester, which is obtained through two or more stages of polymerization, and more specifically, a monomer containing acrylic acid ester or butadiene as the main component. Examples include those obtained by emulsion polymerization of a styrene monomer, acrylonitrile, or methyl methacrylate, each singly or as a mixture, and graft copolymerized. At that time, single or mixed monomers such as styrene monomer, acrylonitrile, or methyl methacrylate are emulsion polymerized, an elastomer component is added thereto, and the monomers of the first stage component system are further grafted. Copolymerized materials can also be used.
それら共重合体の具体的な製造法の例としては特公昭５
０−２３０６７、 特開昭５４−６６９６０． 特
公昭４９−２７１０９号公報に記載の方法などを挙げる
ことができる。Examples of specific manufacturing methods for these copolymers include
0-23067, JP-A-54-66960. Examples include the method described in Japanese Patent Publication No. 49-27109.
多投重合体の配合量は、ポリカーボネート等の主体とな
るプラスチックスに対して、３〜３０重量％の範囲が好
ましい。溶媒接着も可能とするため、ポリカーボネート
がマトリックスとなる必要がある為である。例えば接着
力を保持するため、内径１５ｍｍ、外径２５ｍｍのハブ
の光ディスク円板への接着力はおよそ２０ｋｇ以上が必
要であるが、多段重合体の配合量が３０重量％を越える
と、接着力不足となることがある。The blending amount of the multicast polymer is preferably in the range of 3 to 30% by weight based on the main plastic such as polycarbonate. This is because polycarbonate needs to serve as a matrix to enable solvent adhesion. For example, in order to maintain adhesive strength, the adhesive strength of a hub with an inner diameter of 15 mm and an outer diameter of 25 mm to an optical disk disc needs to be approximately 20 kg or more, but if the blending amount of the multistage polymer exceeds 30% by weight, the adhesive strength There may be a shortage.
一方、本発明のコンポジットハブのもう一つの構成部材
である金属板については、その金属の種類及び形状等は
特に限定されず、適宜好適なものが選択され、インサー
ト成形によりハブ中に組み込まれる。On the other hand, regarding the metal plate, which is another component of the composite hub of the present invention, the type and shape of the metal are not particularly limited, and a suitable one is selected as appropriate and incorporated into the hub by insert molding.
本発明のコンポジットハブは、ハブの主要構成部材であ
る樹脂として、ディスク基板と同質の樹脂を主体として
いる為、ハブとディスク基板の熱膨張率がほぼ同じであ
る。従ってハブを取り付けた光ディスクの駆動装置への
セット時の温度上昇による光ディスクの複屈折率の増加
を防止することができる。In the composite hub of the present invention, since the resin that is the main component of the hub is mainly the same resin as the disk substrate, the hub and the disk substrate have substantially the same coefficient of thermal expansion. Therefore, it is possible to prevent an increase in the birefringence of the optical disc due to a temperature rise when the optical disc with the hub attached is set in the drive device.
更に、エラスティックな改質材として、多段重合体が配
合されているので、ハブ内の金属板とポリカーボネート
等の樹脂成分との熱膨張率の差異により生じたハブ内の
応力は上記改質材により吸収され、ハブの変形やクラッ
クの発生が生じることがない。Furthermore, since a multi-stage polymer is blended as an elastic modifier, the stress within the hub due to the difference in thermal expansion coefficient between the metal plate in the hub and the resin component such as polycarbonate is absorbed by the modifier. This prevents the hub from deforming or cracking.
以下実施例により本発明を更に詳細に説明する。 The present invention will be explained in more detail with reference to Examples below.
実施例１〜６及び比較例１〜２
市販のポリカーボネート〔奇人化成社製パンライト；４
，４°−ジヒドロキシジフェニルアルカン系Ａ［］５５
０３及びＬ１２５０’］と多段重合体〔ロームアンドハ
ース社製アクリロイドＫＭ３３０ Ｅとを第１表に示す
所定の比率で、２８０〜３２０℃に設定した二軸押出機
で溶融混練した。それらの樹脂を使用して、ハブの金属
部分がセットされるハブの成形金型により射出成形を行
い、下記形状のコンポジットハブを得て、その物性を調
べた。その結果を第１表に示す。Examples 1 to 6 and Comparative Examples 1 to 2 Commercially available polycarbonate [Panlite manufactured by Kijin Kasei Co., Ltd.; 4
, 4°-dihydroxydiphenylalkane system A[]55
03 and L1250'] and a multistage polymer [Acryloid KM330 E manufactured by Rohm and Haas Co., Ltd.] were melt-kneaded in a twin-screw extruder set at 280 to 320°C at the predetermined ratios shown in Table 1. Using these resins, injection molding was performed using a hub mold into which the metal part of the hub was set, to obtain a composite hub with the shape shown below, and its physical properties were investigated. The results are shown in Table 1.
試験片；金属（直径２５ｍｍ、 厚さ２ｍｍ）をインサ
ートし、改質材の多段重合体を挿入したハブを成形し試
験片とした。Test piece: A hub into which a metal (diameter 25 mm, thickness 2 mm) was inserted and a multistage polymer as a modifier was inserted was molded to form a test piece.
実施例７〜８
改質材たる多段重合体としてクレハ化学工業社製ＢＴＡ
を使用した他は、実施例２及び実施例５と全く同様にし
て実施した結果を第２表に示す。Examples 7-8 BTA manufactured by Kureha Chemical Industry Co., Ltd. as a multistage polymer as a modifier
Table 2 shows the results of carrying out the experiment in exactly the same manner as in Example 2 and Example 5, except that .
第 ２ 表Table 2
Claims (1)
ンポジットハブにおいて、該樹脂が光ディスク基板を構
成する樹脂と同種のベース樹脂に対して３〜３０重量％
の多段重合体をブレンドしてなるものであることを特徴
とする光ディスク用コンポジットハブ。 ２ベース樹脂がポリカーボネート又はポリメチルメタア
クリレートである特許請求の範囲第１項記載の光ディス
ク用コンポジットハブ。[Scope of Claims] 1. A composite hub for an optical disc made of a resin molded product with a built-in metal plate, in which the resin is 3 to 30% by weight based on the same type of base resin as the resin constituting the optical disc substrate.
A composite hub for an optical disc, characterized in that it is made by blending a multistage polymer of. 2. The composite hub for an optical disc according to claim 1, wherein the base resin is polycarbonate or polymethyl methacrylate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62086099A JPS63251982A (en) | 1987-04-08 | 1987-04-08 | Composite hub for optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62086099A JPS63251982A (en) | 1987-04-08 | 1987-04-08 | Composite hub for optical disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63251982A true JPS63251982A (en) | 1988-10-19 |
| JPH0548553B2 JPH0548553B2 (en) | 1993-07-21 |
Family
ID=13877259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62086099A Granted JPS63251982A (en) | 1987-04-08 | 1987-04-08 | Composite hub for optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63251982A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61208684A (en) * | 1985-03-13 | 1986-09-17 | Fujitsu Ltd | Flexible magnetic disk |
| JPS61225013A (en) * | 1985-03-29 | 1986-10-06 | Fukubi Kagaku Kogyo Kk | Perspective electromagnetic wave shield material and its preparation |
| JPS61225014A (en) * | 1985-03-29 | 1986-10-06 | Fukubi Kagaku Kogyo Kk | Electromagnetic wave shield plate |
| JPS627616U (en) * | 1985-06-29 | 1987-01-17 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5835747A (en) * | 1981-08-28 | 1983-03-02 | Clarion Co Ltd | Plunger device |
-
1987
- 1987-04-08 JP JP62086099A patent/JPS63251982A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61208684A (en) * | 1985-03-13 | 1986-09-17 | Fujitsu Ltd | Flexible magnetic disk |
| JPS61225013A (en) * | 1985-03-29 | 1986-10-06 | Fukubi Kagaku Kogyo Kk | Perspective electromagnetic wave shield material and its preparation |
| JPS61225014A (en) * | 1985-03-29 | 1986-10-06 | Fukubi Kagaku Kogyo Kk | Electromagnetic wave shield plate |
| JPS627616U (en) * | 1985-06-29 | 1987-01-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0548553B2 (en) | 1993-07-21 |
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