JPH07182818A - Method for molding hub for optical disk - Google Patents
Method for molding hub for optical diskInfo
- Publication number
- JPH07182818A JPH07182818A JP5322053A JP32205393A JPH07182818A JP H07182818 A JPH07182818 A JP H07182818A JP 5322053 A JP5322053 A JP 5322053A JP 32205393 A JP32205393 A JP 32205393A JP H07182818 A JPH07182818 A JP H07182818A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- resin
- annular body
- optical disk
- molding
- 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 39
- 238000000465 moulding Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 23
- 229920005989 resin Polymers 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims abstract description 44
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 12
- 239000000057 synthetic resin Substances 0.000 claims abstract description 12
- 239000000696 magnetic material Substances 0.000 claims abstract description 10
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 abstract description 14
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 6
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000008602 contraction Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は光ディスク用ハブの成形
法に関する。詳しくは、光ディスクのドライブ装置にマ
グネットクランプ方式で磁気的に光ディスクを固定する
ために光ディスクの中心部に取り付けられるハブであっ
て、樹脂環状体とその一方の板面に設けられた磁性環状
体とを備える光ディスク用ハブの成形法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding an optical disk hub. Specifically, it is a hub attached to the center of an optical disc for magnetically fixing the optical disc to a drive device of the optical disc by a magnetic clamp method, and includes a resin annular body and a magnetic annular body provided on one plate surface of the resin annular body. The present invention relates to a method for molding an optical disk hub including
【０００２】[0002]
【従来の技術】従来、各種情報信号の記録媒体として光
磁気ディスク等の光ディスクが用いられている。2. Description of the Related Art Conventionally, an optical disk such as a magneto-optical disk has been used as a recording medium for various information signals.
【０００３】この種の光ディスクは、一般に、中心にス
ピンドル挿通孔が設けられた透明な合成樹脂からなる円
板状基板の表面に記録層を形成したものとなっている。This type of optical disk generally has a recording layer formed on the surface of a disk-shaped substrate made of a transparent synthetic resin having a spindle insertion hole at the center.
【０００４】このような光ディスクは、ドライブ装置に
掛けられ、回転しつつ記録、再生が行われるものである
から、この記録、再生に当っては光ディスクをドライブ
装置に確実に固定する必要がある。Since such an optical disc is mounted on a drive device and is recorded and reproduced while rotating, it is necessary to securely fix the optical disc to the drive device during the recording and reproduction.
【０００５】このため、ドライブ装置には光ディスクを
磁気的に固定するためのマグネットクランプが設けら
れ、一方、光ディスクには、このマグネットクランプに
光ディスクを磁気的に引き付けさせるための磁性体とし
てのハブが取り付けられている。Therefore, the drive device is provided with a magnet clamp for magnetically fixing the optical disc, while the optical disc has a hub as a magnetic body for magnetically attracting the optical disc to the magnet clamp. It is installed.
【０００６】即ち、光ディスク表面のスピンドル挿通孔
の周囲に、環状の磁性体（磁石に吸い付く性質を有する
もの）を有するハブを取り付け、このハブの環状磁性体
をドライブ装置のマグネットクランプ内に設けられたマ
グネット（磁石）により引き付けて光ディスクをドライ
ブ装置に固定する。That is, a hub having an annular magnetic body (having a property of attracting to a magnet) is attached around the spindle insertion hole on the surface of the optical disk, and the annular magnetic body of the hub is provided in the magnet clamp of the drive device. The optical disk is attracted by the magnet (fixed) and the optical disk is fixed to the drive device.
【０００７】従来、光ディスクのマグネットクランプ用
ハブとしては、合成樹脂よりなる環形かつ薄板状の樹脂
環状体の一方の板面に、金属よりなる環形かつ薄板状の
磁性環状体が接着剤や一体成形により取り付けたものが
用いられている。Conventionally, as a magnet clamp hub for an optical disk, a ring-shaped and thin plate-shaped magnetic ring-shaped body made of metal is adhesively or integrally molded on one plate surface of a ring-shaped and thin plate-shaped resin ring-shaped body made of synthetic resin. The one installed by is used.
【０００８】[0008]
【発明が解決しようとする課題】上記従来のハブのう
ち、磁性環状体を射出成形によって樹脂環状体に一体成
形したものにおいては、成形後の冷却時における合成樹
脂と磁性材料の金属との熱収縮率の差に起因した応力歪
により、ハブの変形（反り）やクラックの発生が起こり
易く、また、ヒケの発生により中心孔径の寸法安定性が
低下するという問題があった。Among the conventional hubs described above, in the case where the magnetic annular body is integrally molded with the resin annular body by injection molding, the heat of the synthetic resin and the metal of the magnetic material during cooling after molding is improved. There is a problem that the hub is likely to be deformed (warped) or cracked due to the stress strain caused by the difference in the shrinkage rate, and the dimensional stability of the center hole diameter is deteriorated due to the occurrence of sink marks.
【０００９】本発明は上記従来の一体成形法における問
題点を解決し、成形後の冷却時における応力歪に起因す
るハブの変形、クラックやヒケの発生が防止され、中心
孔径の寸法精度に優れた光ディスク用ハブを成形する方
法を提供することを目的とする。The present invention solves the above-mentioned problems in the conventional integral molding method, prevents deformation of the hub due to stress strain during cooling after molding, generation of cracks and sink marks, and excellent dimensional accuracy of the center hole diameter. Another object of the present invention is to provide a method for molding a hub for an optical disc.
【００１０】[0010]
【課題を解決するための手段】本発明の光ディスク用ハ
ブの成形法は、中心にスピンドル挿通孔が設けられた円
板状の光ディスクの中心部に取り付けられるマグネット
クランプ用のハブであって、合成樹脂よりなる環形かつ
薄板状の樹脂環状体と、該樹脂環状体の一方の板面に設
けられた磁性材料よりなる環形かつ薄板状の磁性環状体
と、を備えてなり、該磁性環状体は該樹脂環状体と同軸
的に配置されている光ディスク用ハブを一体成形する方
法において、一対の金型間に形成されたキャビティ内に
前記磁性環状体を配置した後、金型を型締し、次いで該
キャビティ内に溶融樹脂を射出充填し、該溶融樹脂が冷
却固化する前に該樹脂にハブの厚さ方向の圧縮力を加え
ることを特徴とする。A method of molding an optical disk hub according to the present invention is a hub for a magnet clamp which is attached to a central portion of a disk-shaped optical disk having a spindle insertion hole at the center thereof. A ring-shaped and thin-plate-shaped resin annular body made of resin; and a ring-shaped and thin-plate-shaped magnetic ring-shaped body made of a magnetic material provided on one plate surface of the resin ring-shaped body. In a method of integrally molding an optical disk hub coaxially arranged with the resin annular body, after disposing the magnetic annular body in a cavity formed between a pair of molds, the mold is clamped, Next, the molten resin is injected and filled in the cavity, and a compressive force in the thickness direction of the hub is applied to the molten resin before the molten resin is cooled and solidified.
【００１１】[0011]
【作用】キャビティ内に射出充填した溶融樹脂が冷却固
化する前に該樹脂に更に圧縮力を加えた後、冷却固化さ
せることにより、成形後の冷却時における応力歪に起因
するハブの変形、クラックやヒケの発生は有効に防止さ
れる。Function: The molten resin injected and filled in the cavity is further compressed before being solidified by cooling, and is then solidified by cooling, whereby the hub is deformed and cracked due to stress strain during cooling after molding. The occurrence of sink marks is effectively prevented.
【００１２】即ち、射出成形における冷却時において、
樹脂環状体を構成する合成樹脂材料は磁性環状体を構成
する磁性材料に比べて著しく大きく収縮する。このた
め、樹脂環状体側に中心に向う半径方向の大きな応力が
生じ、樹脂環状体側に凹反り変形してしまう。本発明に
おいては、溶融樹脂が冷却固化する前に、ハブの厚さ方
向に圧縮力を加えることにより、この厚さ方向の圧縮力
で上記半径方向の応力の伝達を阻止する。That is, during cooling in injection molding,
The synthetic resin material forming the resin annular body contracts significantly more than the magnetic material forming the magnetic annular body. Therefore, a large radial stress toward the center is generated on the resin annular body side, and the resin annular body side is concavely warped and deformed. In the present invention, before the molten resin is cooled and solidified, a compressive force is applied in the thickness direction of the hub, so that the compressive force in the thickness direction prevents transmission of the stress in the radial direction.
【００１３】これにより、射出成形後の冷却時における
合成樹脂と磁性材料との熱収縮率の差に起因して発生す
る歪によるハブの変形（反り）やクラックの発生、ヒケ
の発生が効果的に防止される。As a result, the deformation (warping) and cracking of the hub and the occurrence of sink marks due to the strain caused by the difference in the thermal contraction rate between the synthetic resin and the magnetic material during cooling after injection molding are effective. To be prevented.
【００１４】[0014]
【実施例】以下、図面を参照して本発明を詳細に説明す
る。第１図は本発明の光ディスク用ハブの成形法の一実
施例方法を示す成形装置の要部断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of essential parts of a molding apparatus showing a method for molding an optical disk hub according to an embodiment of the present invention.
【００１５】第１図に示す成形装置は、型締めされるこ
とによりキャビティ１３を形成する可動金型１１と可動
金型１１の内部で更に移動可能な圧縮可動金型１１’と
固定金型１２とを備え、可動金型１１側のキャビティ１
３内には磁性環状体３が配置されている。この可動金型
１１は固定金型１２側に移動して型締めされる。The molding apparatus shown in FIG. 1 includes a movable mold 11 that forms a cavity 13 by being clamped, a compression movable mold 11 ′ that is further movable inside the movable mold 11, and a fixed mold 12. And a cavity 1 on the movable mold 11 side.
A magnetic annular body 3 is arranged inside 3. The movable mold 11 moves to the fixed mold 12 side and is clamped.
【００１６】固定金型１２は固定盤（図示せず）に載置
されており、この固定金型１２の内部にはスプルー部
（樹脂流入路）１４（１４Ａ，１４Ｂ），１５（１５
Ａ，１５Ｂ）及びランナー部１６が形成されている。ス
プルー部１４Ａ，１５Ａの先端は金型１１，１２間に形
成されるキャビティ１３内に開口し、且つスプルー部１
４Ｂ，１５Ｂの後端はランナー部１６に連絡し、このラ
ンナー部１６は射出装置のノズル（図示せず）に接続し
ている。The fixed mold 12 is placed on a fixed platen (not shown). Inside the fixed mold 12, sprue portions (resin inflow paths) 14 (14A, 14B), 15 (15) are provided.
A, 15B) and the runner portion 16 are formed. The tips of the sprue portions 14A and 15A open into the cavity 13 formed between the molds 11 and 12, and the sprue portion 1
The rear ends of 4B and 15B communicate with the runner portion 16, and the runner portion 16 is connected to the nozzle (not shown) of the injection device.
【００１７】この成形装置においては、磁性環状体３を
配置した可動金型１２を固定金型１２に型閉じした後、
例えばポリカーボネートのような溶融樹脂１０を射出ノ
ズルからランナー部１６及びスプルー部１４，１５を経
てキャビティ１３内に射出させる。溶融樹脂のキャビテ
ィ１３への射出工程開始前又は射出工程中若しくは射出
工程完了直後に、圧縮可動金型１１’は矢印Ａ方向に高
圧で加圧される。In this molding apparatus, after the movable mold 12 on which the magnetic annular body 3 is arranged is closed by the fixed mold 12,
For example, a molten resin 10 such as polycarbonate is injected from the injection nozzle into the cavity 13 through the runner portion 16 and the sprue portions 14 and 15. Before the start of the injection process of the molten resin into the cavity 13, during the injection process, or immediately after the completion of the injection process, the movable compression mold 11 'is pressurized at a high pressure in the direction of arrow A.
【００１８】この可動金型１１の加圧力、即ち型締め圧
力は、通常、ハブ面圧力で６００〜２０００ｋｇ／ｃｍ
2 、望ましくは８００〜１５００ｋｇ／ｃｍ2 の範囲で
ある。この型締め圧力によりキャビティ１３内の溶融樹
脂１０は所望の形状のハブに成形される。The pressure applied to the movable mold 11, that is, the mold clamping pressure is usually 600 to 2000 kg / cm in terms of hub surface pressure.
2 , preferably in the range of 800 to 1500 kg / cm 2 . Due to this mold clamping pressure, the molten resin 10 in the cavity 13 is molded into a hub having a desired shape.
【００１９】本発明においては、射出工程終了後、可動
金型１１の内部の圧縮可動金型１１’の圧力を保圧工程
から冷却工程に至る間において更に増加させる。In the present invention, after the injection process, the pressure of the compression movable mold 11 'inside the movable mold 11 is further increased from the pressure holding process to the cooling process.
【００２０】具体的には、射出工程終了後０．１秒〜冷
却工程終了前（ハブの板厚の中心部まで樹脂の固化が進
行する直前）、好ましくは射出工程終了後０．４〜２．
５秒の間に圧縮可動金型１１’の型締め圧力を増加す
る。即ち、射出工程終了後、溶融樹脂が冷却固化する前
に圧縮可動金型１１’側から矢印Ａ方向に圧縮力を更に
加える。この圧縮可動金型１１’側から加える圧縮力
は、成形後の冷却時に発生する樹脂１０と磁性環状体３
の磁性材料との熱収縮率の差に起因する応力歪を緩和す
るに十分な量であれば良く、特に制限はないが、通常の
場合、型締め圧力の増加量として５００〜２３００ｋｇ
／ｃｍ2 、好ましくは８００〜１５００ｋｇ／ｃｍ2 程
度とするのが好ましい。Specifically, 0.1 seconds after the injection step is completed to before the cooling step is completed (immediately before the solidification of the resin reaches the center of the plate thickness of the hub), preferably 0.4 to 2 after the injection step is completed. ．
The mold clamping pressure of the compression movable mold 11 'is increased within 5 seconds. That is, after the injection step is completed, before the molten resin is cooled and solidified, a compressive force is further applied in the direction of arrow A from the side of the movable compression mold 11 '. The compressive force applied from the compression movable mold 11 ′ side is the resin 10 and the magnetic annular body 3 generated during cooling after molding.
There is no particular limitation as long as it is an amount sufficient to alleviate the stress strain caused by the difference in the thermal contraction rate from the magnetic material of No. 1, but in the normal case, the amount of increase in the mold clamping pressure is 500 to 2300 kg.
/ Cm 2 , preferably about 800 to 1500 kg / cm 2 .
【００２１】そして、この圧縮力を加えた状態で溶融樹
脂１０を冷却固化させた後、可動金型１１及び圧縮可動
金型１１’を固定金型１２から型開きして、成形体（ハ
ブ）を取り出す。Then, after the molten resin 10 is cooled and solidified under the condition that this compressive force is applied, the movable mold 11 and the compression movable mold 11 'are opened from the fixed mold 12 to form a molded body (hub). Take out.
【００２２】このようにして得られる光ディスク用ハブ
は、ハブの反り（変形）が防止されるため、ハブの樹脂
環状体側の平坦度が１００μｍ以下、特に６０μｍ以下
となり、クラックの発生もなく、また、ヒケの発生が著
しく抑制され、特に高い寸法精度（中心孔径の寸法安定
性）が得られる。In the optical disk hub thus obtained, since the hub is prevented from warping (deformation), the flatness of the hub on the resin annular body side is 100 μm or less, particularly 60 μm or less, and no cracks occur. The occurrence of sink marks is remarkably suppressed, and particularly high dimensional accuracy (dimensional stability of the central hole diameter) is obtained.
【００２３】以下に本発明の方法で成形するハブの好適
な実施例について、第２，３図を参照して説明する。A preferred embodiment of the hub formed by the method of the present invention will be described below with reference to FIGS.
【００２４】第２図は第１図に示す方法で製造される光
ディスク用ハブの断面図、第３図は同平面図である。な
お、第３図においては第２図よりも若干縮小して示して
ある。FIG. 2 is a sectional view of an optical disk hub manufactured by the method shown in FIG. 1, and FIG. 3 is a plan view of the same. It should be noted that FIG. 3 is shown in a slightly reduced scale as compared with FIG.
【００２５】第２，３図に示す光ディスク用ハブ１は、
合成樹脂よりなる環形かつ薄板状の樹脂環状体２の一方
の板面に、磁性材料よりなる環形かつ薄板状の磁性環状
体３が同軸的に設けられたものであり、樹脂環状体２の
他方の板面には、周方向に延在する凹部４が設けられて
いる。The optical disk hub 1 shown in FIGS.
A ring-shaped and thin plate-shaped resin ring-shaped body 2 made of a synthetic resin is coaxially provided with a ring-shaped and thin plate-shaped magnetic ring-shaped body 3 made of a magnetic material on one plate surface of the resin ring-shaped body 2. The plate surface is provided with a concave portion 4 extending in the circumferential direction.
【００２６】この凹部４は樹脂環状体２の厚み方向の途
中まで達する深さのものであり、凹部４は周回環状に設
けられている。５はスピンドル挿通孔である。The recess 4 has a depth that reaches halfway in the thickness direction of the resin annular body 2, and the recess 4 is provided in a circular loop shape. Reference numeral 5 is a spindle insertion hole.
【００２７】磁性環状体３の内周縁部には、その外面か
ら凹陥する段部３Ａが周設されており、この段部３Ａに
樹脂環状体２を構成する合成樹脂が入り込むように鍔状
部２Ａが形成されている。そして、磁性環状体３の外面
から立ち下がる段部の立下り面３Ｂと、この段部３Ａに
入り込んだ合成樹脂の鍔状部２Ａの端面２Ｂとの間には
間隙６が形成されている。A step portion 3A which is recessed from the outer surface of the magnetic annular body 3 is provided around the inner peripheral edge portion of the magnetic annular body 3, and a collar-shaped portion is formed so that the synthetic resin forming the resin annular body 2 may enter the step portion 3A. 2A is formed. Then, a gap 6 is formed between the falling surface 3B of the step portion that falls from the outer surface of the magnetic annular body 3 and the end surface 2B of the collar portion 2A of the synthetic resin that has entered the step portion 3A.
【００２８】このような光ディスク用ハブ１は、第１図
に示す射出成形により一体成形で容易に製造されるが、
この成形に当り、樹脂環状体２の磁性環状体３配設面と
反対側の板面に周方向に延在するように設けられた凹部
４の存在で、射出成形後の冷却時における合成樹脂と磁
性材料との熱収縮率の差に起因して発生する応力歪によ
るハブの変形（反り）やクラックの発生はより一層確実
に防止される。Such an optical disk hub 1 is easily manufactured by integral molding by injection molding shown in FIG.
At the time of this molding, the presence of the concave portion 4 provided so as to extend in the circumferential direction on the plate surface of the resin annular body 2 opposite to the surface on which the magnetic annular body 3 is disposed allows the synthetic resin at the time of cooling after injection molding. The deformation (warpage) of the hub and the generation of cracks due to the stress strain caused by the difference in heat shrinkage between the magnetic material and the magnetic material can be prevented more reliably.
【００２９】このような光ディスク用ハブ１は、樹脂環
状体２の凹部４形成側の接着面（第２，３図の内周側接
着面２ａ及び外周側接着面２ｂ）が、光ディスクの基板
に接着剤で接着されることにより取り付けられ、ドライ
ブ装置のマグネットクランプのマグネットに対して磁性
環状体３が吸引されることにより光ディスクを固定す
る。In such an optical disk hub 1, the adhesive surfaces (the inner peripheral side adhesive surface 2a and the outer peripheral side adhesive surface 2b in FIGS. 2 and 3) of the resin annular body 2 on the side where the concave portion 4 is formed are the substrates of the optical disk. The optical disk is fixed by being attached with an adhesive, and the magnetic annular body 3 is attracted to the magnet of the magnet clamp of the drive device to fix the optical disk.
【００３０】なお、樹脂環状体の板面に形成する凹部
は、第２，３図に示す如く、その厚み方向の途中まで達
する深さのものに限らず、樹脂環状体を貫通して磁性環
状体に達する深さに設けられた凹部であって、これによ
って樹脂環状体は内周側接着面を構成する内環部と外周
側接着面を構成する外環部とに分けられ、且つこの内環
部と外環部とが合成樹脂製橋絡部によって一体に連結さ
れているものであっても良い。The recess formed on the plate surface of the resin annular body is not limited to the depth reaching the middle in the thickness direction as shown in FIGS. It is a recess provided at a depth reaching the body, whereby the resin annular body is divided into an inner ring portion forming an inner peripheral side adhesive surface and an outer ring portion forming an outer peripheral side adhesive surface. The ring portion and the outer ring portion may be integrally connected by a bridging portion made of synthetic resin.
【００３１】[0031]
【発明の効果】以上詳述した通り、本発明の光ディスク
用ハブの成形法によれば、成形後の冷却時における応力
歪に起因するハブの変形、クラックやヒケの発生が効果
的に防止され、形状安定性、寸法安定性（特にスピンド
ル挿通孔の寸法精度）、品質安定性に優れた光ディスク
用ハブが提供される。As described in detail above, according to the method of molding an optical disk hub of the present invention, the deformation of the hub, the generation of cracks and the sink marks due to the stress strain during cooling after molding can be effectively prevented. Provided is an optical disk hub having excellent shape stability, dimensional stability (in particular, dimensional accuracy of the spindle insertion hole), and quality stability.
【図１】本発明の光ディスク用ハブの成形法の一実施例
方法を示す成形装置の要部断面図である。FIG. 1 is a sectional view of an essential part of a molding apparatus showing a method of an embodiment of a method for molding an optical disk hub of the present invention.
【図２】第１図に示す方法で製造される光ディスク用ハ
ブの断面図である。2 is a cross-sectional view of an optical disk hub manufactured by the method shown in FIG.
【図３】第２図に示す光ディスク用ハブの平面図であ
る。FIG. 3 is a plan view of the optical disk hub shown in FIG.
１ 光ディスク用ハブ ２ 樹脂環状体 ３ 磁性環状体 ４ 凹部 ５ スピンドル挿通孔 ６ 間隙 １０ 溶融樹脂 １１ 可動金型 １１’ 圧縮可動金型 １２ 固定金型 １３ キャビティ １４，１５ スプルー部 １６ ランナー部 1 hub for optical disk 2 resin annular body 3 magnetic annular body 4 recess 5 spindle insertion hole 6 gap 10 molten resin 11 movable mold 11 'compression movable mold 12 fixed mold 13 cavity 14, 15 sprue part 16 runner part
Claims (1)
板状の光ディスクの中心部に取り付けられるマグネット
クランプ用のハブであって、合成樹脂よりなる環形かつ
薄板状の樹脂環状体と、該樹脂環状体の一方の板面に設
けられた磁性材料よりなる環形かつ薄板状の磁性環状体
と、を備えてなり、該磁性環状体は該樹脂環状体と同軸
的に配置されている光ディスク用ハブを一体成形する方
法において、 一対の金型間に形成されたキャビティ内に前記磁性環状
体を配置した後、金型を型締し、次いで該キャビティ内
に溶融樹脂を射出充填し、該溶融樹脂が冷却固化する前
に該樹脂にハブの厚さ方向の圧縮力を加えることを特徴
とする光ディスク用ハブの成形法。1. A ring-shaped and thin-plate resin annular body made of synthetic resin, which is a hub for a magnet clamp attached to the center of a disk-shaped optical disc having a spindle insertion hole at the center, and the resin. An annular and thin plate-shaped magnetic annular body made of a magnetic material provided on one plate surface of the annular body, and the magnetic annular body is arranged coaxially with the resin annular body. In the method of integrally molding, the magnetic annular body is placed in a cavity formed between a pair of molds, the mold is clamped, and then a molten resin is injected and filled into the cavity, A method for molding a hub for an optical disk, wherein a compressive force in the thickness direction of the hub is applied to the resin before being cooled and solidified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5322053A JP2982593B2 (en) | 1993-12-21 | 1993-12-21 | Hub for optical disk, molding method thereof, and optical disk using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5322053A JP2982593B2 (en) | 1993-12-21 | 1993-12-21 | Hub for optical disk, molding method thereof, and optical disk using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07182818A true JPH07182818A (en) | 1995-07-21 |
| JP2982593B2 JP2982593B2 (en) | 1999-11-22 |
Family
ID=18139387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5322053A Expired - Fee Related JP2982593B2 (en) | 1993-12-21 | 1993-12-21 | Hub for optical disk, molding method thereof, and optical disk using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2982593B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6002663A (en) * | 1997-04-17 | 1999-12-14 | Imation Corp. | Hubless optical disc having low radial runout and method of manufacture |
| US6154441A (en) * | 1997-04-17 | 2000-11-28 | Imation Corp. | Method for centering a hub in an optical disc, and an optical storage system using such disc |
-
1993
- 1993-12-21 JP JP5322053A patent/JP2982593B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6002663A (en) * | 1997-04-17 | 1999-12-14 | Imation Corp. | Hubless optical disc having low radial runout and method of manufacture |
| US6154441A (en) * | 1997-04-17 | 2000-11-28 | Imation Corp. | Method for centering a hub in an optical disc, and an optical storage system using such disc |
| US6382955B1 (en) | 1997-04-17 | 2002-05-07 | Imation Corp. | Disc molding apparatus for hubless optical disc having low radial runout |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2982593B2 (en) | 1999-11-22 |
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