JPH03280279A - Optical disk and its production - Google Patents
Optical disk and its productionInfo
- Publication number
- JPH03280279A JPH03280279A JP2078880A JP7888090A JPH03280279A JP H03280279 A JPH03280279 A JP H03280279A JP 2078880 A JP2078880 A JP 2078880A JP 7888090 A JP7888090 A JP 7888090A JP H03280279 A JPH03280279 A JP H03280279A
- Authority
- JP
- Japan
- Prior art keywords
- center
- disk substrate
- substrate
- disk
- magnetic material
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- 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
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、光、熱等の手段により光学情報を高密度に記
録再生あるいは消去、書換えできる光ディスクに関し、
特に、ディスク基板とハブ部との関連構成に関するもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical disc on which optical information can be recorded, reproduced, erased, and rewritten at high density by means of light, heat, etc.
In particular, it relates to the related structure between the disk substrate and the hub section.
従来、ハブ付き光ディスクにおいて、第４関に示すよう
に、ディスク基板２１の中心部を打ち抜いてセンタ穴部
２１ａを形成し、該センタ穴部２１ａを利用してハブ部
２２を取付けてハブ付き光ディスクを構成している。こ
の場合、ディスク基板２１のセンタ穴部２１ａと係合す
るハブ部２２の寸法は、センタ穴部２１ａの寸法に対し
て若干小径である。Conventionally, in a hub-equipped optical disc, as shown in the fourth section, a center hole 21a is formed by punching out the center of a disc substrate 21, and a hub part 22 is attached using the center hole 21a to produce a hub-equipped optical disc. It consists of In this case, the size of the hub portion 22 that engages with the center hole 21a of the disk substrate 21 is slightly smaller than the size of the center hole 21a.
このハブ付き光ディスクのクランプ方式は、ディスク駆
動用モータ１６のスピンドル１７に固定されたターンテ
ーブル１８上に、ディスク基板２１の裏面が保持され、
ハブ部２２に設けた磁性体２３の穴部とスピンドル１７
とが係合することによって、ハブ付き光ディスクの中心
位置が定められ、ハブ部２２に設けた磁性体２３とター
ンテーブル１８内に固定された磁石１９との磁気的吸引
力によりクランプされる。In this clamping method for an optical disk with a hub, the back surface of a disk substrate 21 is held on a turntable 18 fixed to a spindle 17 of a disk drive motor 16.
The hole of the magnetic body 23 provided in the hub portion 22 and the spindle 17
The central position of the hub-equipped optical disk is determined by the engagement between the two, and the hub-equipped optical disk is clamped by the magnetic attractive force between the magnetic body 23 provided on the hub portion 22 and the magnet 19 fixed within the turntable 18.
また、スピンドル挿入孔を形成したフランジをハブ部と
一体化し、ハブ部とディスク基板とを硬化性透明材料の
合成樹脂により構成した光ディスクも、特開平１−１７
８１４９号公報において公知である。Furthermore, an optical disc in which a flange with a spindle insertion hole is formed is integrated with a hub part, and the hub part and the disc substrate are made of a synthetic resin of a curable transparent material is also disclosed in Japanese Patent Application Laid-Open No. 1-177.
It is known from the publication No. 8149.
〔発明が解決しようとする課題］
前述したようなハブ部を別体としてディスク基板に取付
ける形式のハブ付き光ディスクにおいて、ディスク基板
の中心部にセンタ穴部を打ち抜く際、センタ穴部の周辺
にばりが発生し、場合によっては、センタ穴部が真円と
ならず、ディスク基板の記録面に対して偏心することに
なる。[Problems to be Solved by the Invention] In the above-mentioned optical disc with a hub in which the hub is separately attached to the disc substrate, when punching a center hole in the center of the disc substrate, burrs are formed around the center hole. This may occur, and in some cases, the center hole will not be perfectly circular and will be eccentric with respect to the recording surface of the disk substrate.
このため、ディスク基板に薄肉状のハブ部を取付ける際
、傾斜や偏心を生じている。For this reason, when attaching the thin-walled hub portion to the disk substrate, inclination and eccentricity occur.
また、ディスク基板の中心部端面に係合孔を有する磁性
体を一体成形する前記公知の光ディスクにおいても、デ
ィスク基板の中心位置に孔部を必要とし、孔部形成のた
めセンターピンを使用し、ディスク基板の中心位置から
センターピン除去の際、ディスク基板に大きな応力を与
え、このためディスク基板にそり、複屈折を生じ、ディ
スク基板の孔部内周にパリを発生している。Furthermore, in the above-mentioned known optical disk in which a magnetic material having an engagement hole is integrally molded on the end surface of the center portion of the disk substrate, a hole is required at the center position of the disk substrate, and a center pin is used to form the hole. When the center pin is removed from the center of the disk substrate, a large stress is applied to the disk substrate, causing warpage in the disk substrate, birefringence, and formation of a flash on the inner periphery of the hole in the disk substrate.
また、ディスク基板は磁性体を介して駆動されるが、ス
ピンドルを支承する磁性体を備えたハブ部の肉厚が薄い
ことから、チャッキングや駆動の繰り返しによってハブ
部の中心孔が変形する。Furthermore, although the disk substrate is driven via a magnetic material, since the hub portion that supports the spindle and includes the magnetic material is thin, the center hole of the hub portion is deformed by repeated chucking and driving.
本発明は、前記従来の欠点を解消することができる光デ
ィスクとその製法を提供するものであり、光ディスクの
製法としてセンターピン引き抜き工程をなくし、該セン
ターピン引き抜き工程に起因するディスク基板に対する
悪影響を阻止し、更に、駆動スピンドルの保合部に変形
を発生することのないディスク基板を提供するものであ
る。The present invention provides an optical disc and a method for manufacturing the same that can eliminate the above-mentioned conventional drawbacks, and eliminates the center pin pulling process in the optical disc manufacturing method, thereby preventing the adverse effects on the disc substrate caused by the center pin pulling process. Furthermore, it is an object of the present invention to provide a disk substrate that does not cause deformation of the retaining portion of the drive spindle.
本発明は、前記目的を達成するために、レーザ光を利用
して高密度な情報の記録・再生を行う光ディスクにおい
て、ディスク基板の一端面の中心部に、ディスク基板の
中心位置を決定する凹状軸受部を形成した磁性体をイン
サート成形により設けたことを特徴とするものであり、
更に、レーザ光を利用して高密度な情報の記録・再生を
行う光ディスクの製法において、凹状軸受部を形成した
磁性体をディスク基板の一端面の中心部に対応する金型
内に配置し、該金型内にディスク基板となる熱可塑性樹
脂を充填し、ディスク基板の中心部に凹状軸受部を形成
した磁性体を一体にインサート成形することを特徴とす
るものである。In order to achieve the above object, the present invention provides an optical disc for recording and reproducing high-density information using laser light, in which a concave shape is provided at the center of one end surface of the disc substrate to determine the center position of the disc substrate. It is characterized in that the magnetic material forming the bearing part is provided by insert molding,
Furthermore, in a method for manufacturing an optical disk that uses laser light to record and reproduce high-density information, a magnetic material with a concave bearing portion is placed in a mold corresponding to the center of one end surface of the disk substrate. This method is characterized in that the mold is filled with a thermoplastic resin that will become the disk substrate, and a magnetic material with a concave bearing formed in the center of the disk substrate is integrally insert-molded.
本発明の構成により、ディスク基板の中央に保合孔を形
成することなく、凹状軸受部を形成した磁性材の板体を
ディスク基板と一体に構成し、係合孔を設けることによ
るディスク基板の変形や駆動時のディスク基板の磨耗等
を低減することができる。According to the structure of the present invention, a magnetic plate having a concave bearing portion is formed integrally with the disk substrate without forming a retaining hole in the center of the disk substrate, and an engagement hole is provided. Deformation and wear of the disk substrate during driving can be reduced.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図には、ディスク基板１の中心位置の端面には、デ
ィスク基板を駆動するスピンドルと係合する凹状の軸受
部２ａを形成し、その凹状の軸受部２ａの外周に凸状環
状部２ｂを形成し、且つ、凸状環状部２ｂの爪状端部２
Ｃをディスク基板１の内部に折り曲げた磁性材の板体２
を設けている。In FIG. 1, a concave bearing portion 2a that engages with a spindle that drives the disk substrate is formed on the end face at the center position of the disk substrate 1, and a convex annular portion 2b is formed on the outer periphery of the concave bearing portion 2a. , and the claw-like end portion 2 of the convex annular portion 2b
Plate 2 made of magnetic material with C bent inside the disk substrate 1
has been established.
すなわち、第１図の光ディスクを得るには、第２図に示
すように、スタンパを保持した固定金型１０Ａの中央部
に前記形状をした磁性材の板体２を配置し、固定金型１
０Ａと可動金型１０Ｂとの間に形成されるキャビティ１
１内にディスク基板の材料であるポリカーボネート樹脂
等の溶融樹脂を可動金型１０Ｂに形成したランナー１２
を介して充填することより、ディスク基板と共に、磁性
材の板体により形成された凹状の軸受部２ａの外周にハ
ブ部３が一体に形成される。ディスク基板１の上部中心
位置の窪み４は成形時のスプルーの除去跡であり、５は
段差である。That is, in order to obtain the optical disc shown in FIG. 1, as shown in FIG.
Cavity 1 formed between 0A and movable mold 10B
A runner 12 in which a movable mold 10B is formed with molten resin such as polycarbonate resin, which is the material of the disk substrate.
By filling the hub portion 3 with the disk substrate, the hub portion 3 is integrally formed on the outer periphery of the concave bearing portion 2a formed of a plate of magnetic material. A recess 4 at the center of the upper part of the disk substrate 1 is a trace of sprue removed during molding, and 5 is a step.
このようにして形成された本発明の光ディスクは、磁性
体の板体２による凹状の軸受部２ａをディスク基板１の
中心位置に配置しており、光ディスクの成形時に凹状の
軸受部２ａの外周には、凹状の軸受部２ａを形成した磁
性体の板体２により凸状環状部２ｂを形成し、その凸状
環状部２ｂの爪状端部２ｃをディスク基板１内に喰い込
ませているため、凸状環状部２ｂは樹脂を満たしてハブ
部３を構成し、爪状端部２ｃはディスク基板１内に保持
されており、磁性体の板体２はディスク基板１に強固に
取付けられ、外部の衝撃によりはずれることはない。The optical disc of the present invention thus formed has a concave bearing part 2a made of a magnetic plate 2 arranged at the center of the disc substrate 1, and the outer periphery of the concave bearing part 2a is This is because the convex annular portion 2b is formed by the magnetic plate 2 on which the concave bearing portion 2a is formed, and the claw-like end portion 2c of the convex annular portion 2b is bitten into the disk substrate 1. , the convex annular portion 2b is filled with resin to constitute the hub portion 3, the claw-like end portion 2c is held within the disk substrate 1, the magnetic plate 2 is firmly attached to the disk substrate 1, It will not come off due to external impact.
しかも、本発明の光ディスクは、ディスク基板１の中心
位置に孔部を設けるものでないから、ディスク基板の製
作時に従来のようなセンターピンの引き抜き工程を不要
とし、センターピン引き抜きによるディスク基板への悪
影響を生じることがない。Moreover, since the optical disc of the present invention does not have a hole at the center position of the disc substrate 1, the conventional process of pulling out the center pin is not required when manufacturing the disc board, and the pulling out of the center pin does not have an adverse effect on the disc board. will not occur.
次に、本発明の光ディスクを駆動する際のクランプ機構
について、第３図により説明する。Next, the clamping mechanism for driving the optical disc of the present invention will be explained with reference to FIG.
第３図には、第１図に示した構成のハブ部３を構成した
ディスク基板１が駆動手段にクランプされた状態を示す
。FIG. 3 shows a state in which the disk substrate 1 forming the hub portion 3 having the configuration shown in FIG. 1 is clamped by a driving means.
ディスクモータ６のスピンドル７には、ターンテーブル
８が固定され、該ターンテーブル８の端面にディスク基
板１の第二面が保持される。A turntable 8 is fixed to the spindle 7 of the disk motor 6, and the second surface of the disk substrate 1 is held on the end surface of the turntable 8.
ターンテーブル８内には磁石９が固定され、該磁石９は
ハブ部３を構成する磁性材の板体２の凸状環状部２ｂと
対向し、磁気的吸引力が作用する位置に配置され、且つ
スピンドル７の先端部が磁性材の板体２の凹状の軸受部
２ａと保合固定されることにより、ディスク基板１の中
心位置はスピンドル７に正しく位置決めされる。A magnet 9 is fixed within the turntable 8, and the magnet 9 is placed in a position where it faces the convex annular portion 2b of the plate 2 of magnetic material constituting the hub portion 3 and is subjected to magnetic attraction. In addition, the center of the disk substrate 1 is correctly positioned on the spindle 7 by fixing the tip of the spindle 7 to the concave bearing 2a of the plate 2 made of magnetic material.
この場合、ディスク基板１の中心位置に形成される凹状
の軸受部２ａは、スピンドル７の径と同径に形成されて
、スピンドル７の先端部と係合し、ディスク基板１はタ
ーンテーブル８内の磁石９と磁性材の板体２の凸状環状
部２ｂとの磁気的吸引力によって確実にクランプされる
。In this case, the concave bearing portion 2a formed at the center of the disk substrate 1 is formed to have the same diameter as the spindle 7, and engages with the tip of the spindle 7, and the disk substrate 1 is placed inside the turntable 8. The magnetic attraction force between the magnet 9 and the convex annular portion 2b of the plate 2 made of magnetic material ensures secure clamping.
本発明の構成により、位置決めのためにディスク基板の
中心に磁性板体からなる凹状の軸受部、凸状環状部をイ
ンサート成形により、ディスク基板と一体化したため、
従来のようにディスク基板の中心に貫通穴を形成する際
のセンターピンの引抜き工程を不要とし、ディスク基板
に対する悪影響を防止でき、しかも、ディスク基板の駆
動に際し、駆動スピンドルを剛性の高い磁性体で支承す
るからディスク基板に変形、磨耗を低減できる効果を有
する。According to the configuration of the present invention, a concave bearing portion and a convex annular portion made of a magnetic plate are integrated with the disk substrate by insert molding at the center of the disk substrate for positioning.
This eliminates the need for the conventional process of pulling out the center pin when forming a through hole in the center of the disk substrate, and prevents negative effects on the disk substrate.Furthermore, when driving the disk substrate, the drive spindle is made of a highly rigid magnetic material. Since it is supported, it has the effect of reducing deformation and wear on the disk substrate.
【図面の簡単な説明】
第１図は本発明の光ディスクを示す概略断面図、第２図
は本発明の光ディスクの製造金型を示す概略断面図、
第３図は本発明の光ディスクとディスク駆動側との関連
を示す概略断面図、
第４図は従来の構成を示す概略断面図。[Brief Description of the Drawings] Fig. 1 is a schematic sectional view showing an optical disc of the present invention, Fig. 2 is a schematic sectional view showing a manufacturing mold for the optical disc of the invention, and Fig. 3 is an optical disc and a disc drive of the invention. FIG. 4 is a schematic sectional view showing the conventional configuration.
Claims (2)
行う光ディスクにおいて、ディスク基板の一端面の中心
部に、ディスク基板の中心位置を決定する凹状軸受部を
形成した磁性体をインサート成形により設けたことを特
徴とする光ディスク。(1) In optical discs that use laser light to record and reproduce high-density information, a magnetic material with a concave bearing part that determines the center position of the disc substrate is inserted in the center of one end surface of the disc substrate. An optical disc characterized by being provided by molding.
行う光ディスクの製法において、凹状軸受部を形成した
磁性体をディスク基板の一端面の中心部に対応する金型
内に配置し、該金型内にディスク基板となる熱可塑性樹
脂を充填し、ディスク基板の中心部に凹状軸受部を形成
した磁性体を一体にインサート成形することを特徴とす
る光ディスクの製法。(2) In a manufacturing method for optical disks that use laser light to record and reproduce high-density information, a magnetic material with a concave bearing portion is placed in a mold corresponding to the center of one end surface of the disk substrate. A method for manufacturing an optical disk, characterized in that the mold is filled with a thermoplastic resin that will become a disk substrate, and a magnetic material having a concave bearing portion formed in the center of the disk substrate is integrally insert-molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2078880A JPH03280279A (en) | 1990-03-29 | 1990-03-29 | Optical disk and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2078880A JPH03280279A (en) | 1990-03-29 | 1990-03-29 | Optical disk and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03280279A true JPH03280279A (en) | 1991-12-11 |
Family
ID=13674132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2078880A Pending JPH03280279A (en) | 1990-03-29 | 1990-03-29 | Optical disk and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03280279A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0559659U (en) * | 1991-12-28 | 1993-08-06 | 京セラ株式会社 | optical disk |
| US5326240A (en) * | 1991-10-12 | 1994-07-05 | Sony Corporation | Metal mold device for molding a disc substrate |
| EP0895240A1 (en) * | 1997-07-31 | 1999-02-03 | Sony Corporation | Recording medium and disc cartridge |
-
1990
- 1990-03-29 JP JP2078880A patent/JPH03280279A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5326240A (en) * | 1991-10-12 | 1994-07-05 | Sony Corporation | Metal mold device for molding a disc substrate |
| US5552098A (en) * | 1991-10-12 | 1996-09-03 | Sony Corporation | Method for fabrication of disc substrate |
| EP0705676A3 (en) * | 1991-10-12 | 1996-12-27 | Sony Corp | Metal mold device and method for molding a disc substrate |
| JPH0559659U (en) * | 1991-12-28 | 1993-08-06 | 京セラ株式会社 | optical disk |
| EP0895240A1 (en) * | 1997-07-31 | 1999-02-03 | Sony Corporation | Recording medium and disc cartridge |
| US6061215A (en) * | 1997-07-31 | 2000-05-09 | Sony Corporation | Disc recording medium with check insertion hole extending across inner and outer rim portions of the hub |
| CN1130696C (en) * | 1997-07-31 | 2003-12-10 | 索尼公司 | Recording medium and disc cartridge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0705676B1 (en) | Metal mould device and a method to mould a disc substrate | |
| EP0557147B1 (en) | Mold device for fabricating disc susbstrate and disc substrate fabricated by this mold device | |
| US6495235B2 (en) | Optical disk, substrate of the same, and mold for forming the substrate | |
| EP0266746A2 (en) | Information memory medium | |
| JPH03280279A (en) | Optical disk and its production | |
| JP3401795B2 (en) | Manufacturing method of disk substrate | |
| JP3264419B2 (en) | Recording disk and molding die device | |
| JP3498099B2 (en) | Recording media disk | |
| JP3271072B2 (en) | Method of forming disc substrate for recording information signal | |
| JP3208914B2 (en) | Disk substrate and mold device for disk substrate molding | |
| JP3808001B2 (en) | Turntable for disk-shaped information recording medium and disk device | |
| JP2982593B2 (en) | Hub for optical disk, molding method thereof, and optical disk using the same | |
| JP3072658B2 (en) | Information signal recording disk | |
| JP4093686B2 (en) | Disc substrate molding die and molding apparatus | |
| JP2001134932A (en) | Disk board and injection molding device | |
| US20050046689A1 (en) | Optical disk medium, optical disk medium production method, turntable and optical disk apparatus | |
| JP3301103B2 (en) | Die equipment for disk substrate molding | |
| JPH11265527A (en) | Disc-shaped recording medium | |
| JP3574667B2 (en) | Method of forming disk substrate | |
| JPH06215517A (en) | Flat information recording medium and manufacturing method thereof | |
| JP3383387B2 (en) | Optical disc substrate and mold for molding this optical disc substrate | |
| JPH0929789A (en) | Molding equipment for disk substrate molding | |
| JPH0939035A (en) | Mold for optical disk substrate and molding method | |
| JP2002074756A (en) | Optical disc, method for manufacturing the same, and mold for molding disc molded body | |
| JP2001225360A (en) | Method and apparatus for molding disk substrate |