JPH06274936A - Optical disk substrate - Google Patents

Optical disk substrate

Info

Publication number
JPH06274936A
JPH06274936A JP5060180A JP6018093A JPH06274936A JP H06274936 A JPH06274936 A JP H06274936A JP 5060180 A JP5060180 A JP 5060180A JP 6018093 A JP6018093 A JP 6018093A JP H06274936 A JPH06274936 A JP H06274936A
Authority
JP
Japan
Prior art keywords
substrate
optical disk
substrates
disk substrate
stacked
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
Application number
JP5060180A
Other languages
Japanese (ja)
Inventor
Masako Sakuta
雅子 作田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DIC Corp
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Dainippon Ink and Chemicals Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd, Dainippon Ink and Chemicals Co Ltd filed Critical NKK Corp
Priority to JP5060180A priority Critical patent/JPH06274936A/en
Publication of JPH06274936A publication Critical patent/JPH06274936A/en
Pending legal-status Critical Current

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
    • B29C45/26—Moulds
    • B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
    • 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
    • B29C2045/2667—Particular inner or outer peripheral portions of the substrate

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To prevent damages of substrates when substrates are stacked so that no spacer is necessary for storage of substrates by injection molding a substrate in a manner that the outer edge of the substrate is thicker than other area and thickness of the substrate changes continuously without giving no step on the surface of the substrate. CONSTITUTION:The optical disk substrate made of polycarbonate has a flat surface where guide grooves 2 are formed, while on the back surface, thickness is continuously changed to increase from outer line of the groove area 3 and mirror area 4 to the outer edge. Thereby, when substrates are stacked, scratches or rubbing on the surfaces can be prevented. These substrates can be stacked and stored without using spacers or the like.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】レーザー光等の光学的手段を用い
て情報の記録、再生、消去等を行う光記録媒体に関し、
特に、光磁気形の光ディスク用基板に関する。TECHNICAL FIELD The present invention relates to an optical recording medium for recording, reproducing and erasing information by using optical means such as laser light.
In particular, it relates to a magneto-optical type optical disk substrate.

【０００２】[0002]

【従来の技術】光ディスクは、その大容量、高密度、ラ
ンダムアクセス可能といった特徴により、画像情報や音
楽情報、あるいはコンピュータのデータ保管用媒体とし
て広く利用されている。2. Description of the Related Art Optical discs are widely used as a medium for storing image information, music information, or computer data because of their features such as large capacity, high density, and random access.

【０００３】その中で特に、光磁気形の光ディスクは、
記録の消去や書き込みが可能であるため、重要性が年々
増大している。光磁気形の光ディスク用基板には、通
常、案内溝を切ってあるポリカーボネートなどのプラス
チック基板が用いられているが、保管などのためにスタ
ッカーポールに積み重ねる場合には、１枚１枚の基板の
間にスペーサーと呼ばれる、基板案内溝に重ならない小
さい半径の円板を挟んで基板表面の傷付きを防止してい
る。このスペーサーは、光磁気形の光ディスク製造工程
おいて、取り外す工程を必要とする。しかし、スペーサ
ーが基板表面に吸着し易いため、取り外しが難しく、特
に製造ラインの自動化等を行う場合に問題となってい
る。Among them, the magneto-optical type optical disk is
Since records can be erased and written, their importance is increasing year by year. As a magneto-optical type optical disk substrate, a plastic substrate such as polycarbonate having a guide groove cut is usually used. However, when stacking on a stacker pole for storage etc. A spacer called a spacer, which has a small radius and does not overlap the substrate guide groove, is sandwiched between them to prevent the substrate surface from being scratched. This spacer requires a removing step in the magneto-optical type optical disk manufacturing process. However, since the spacer is easily adsorbed on the substrate surface, it is difficult to remove the spacer, which is a problem especially when the manufacturing line is automated.

【０００４】このような問題を解決するために、ＣＤ等
の再生専用形の光ディスクでは、基板の内周部に凸部を
設けて積み重ねたときのディスク情報信号部表面の直接
接触を防いでいるが、光磁気形の光ディスクの場合には
コーティングの不良を招くため、このような形状の基板
は通常用いられていない。In order to solve such a problem, in a read-only optical disc such as a CD, a convex portion is provided on the inner peripheral portion of the substrate to prevent direct contact with the surface of the disc information signal portion when stacked. However, in the case of a magneto-optical type optical disk, a coating defect is caused, and thus a substrate having such a shape is not usually used.

【０００５】[0005]

【発明が解決しようとする課題】本発明の課題は、光デ
ィスク用基板の断面形状の改良により、基板を積み重ね
た際の基板表面の損傷を防止し、特に、光磁気形の光デ
ィスク用基板の保管時に用いられるスペーサーの省略を
可能にすることである。An object of the present invention is to prevent damage to the substrate surface when the substrates are stacked by improving the cross-sectional shape of the substrate for the optical disc, and particularly to store the substrate for the magneto-optical disc. It is possible to omit the spacer sometimes used.

【０００６】[0006]

【課題を解決するための手段】本発明は、上記課題を解
決するために、光ディスク用基板において、外端部がそ
の他の部分より厚いことを特徴とする光ディスク用基板
を提供し、さらに、基板の厚さ変化が連続的であり且つ
基板面上に段差部を持たないことを特徴とする前記光デ
ィスク用基板を提供する。In order to solve the above problems, the present invention provides a substrate for an optical disc, wherein the outer end portion is thicker than the other portions, and the substrate is further provided. The substrate for optical disks is characterized in that the thickness change of the substrate is continuous and there is no stepped portion on the substrate surface.

【０００７】すなわち、光ディスク用基板として、基板
上のグルーブ部やミラー部などの情報信号部にかからな
い点から基板の外端に向かって連続的に厚さを増す部分
を持つよう射出成形によって作製した基板を用いる。That is, an optical disk substrate was manufactured by injection molding so as to have a portion whose thickness increases continuously toward the outer edge of the substrate from the point that it does not affect the information signal portion such as the groove portion and the mirror portion on the substrate. A substrate is used.

【０００８】[0008]

【作用】本発明の光ディスク用基板は、上述のように、
連続的に基板の厚さを変化させることにより、基板の表
面に、保護コーティングする際に妨げとなる突起部また
は段差を持たず、コーティング液がなめらかに広がり、
コーティングむら等の不良の発生が起こらない。The optical disk substrate of the present invention, as described above,
By continuously changing the thickness of the substrate, the surface of the substrate does not have protrusions or steps that hinder the protective coating, and the coating solution spreads smoothly.
No defects such as uneven coating occur.

【０００９】[0009]

【実施例】以下、本発明の実施例により、図面を用いて
本発明を具体的に説明する。The present invention will be described in detail below with reference to the drawings according to the embodiments of the present invention.

【００１０】（実施例１）図１は、ポリカーボネート製
で光磁気形の本発明の光ディスク用基板の模式断面図で
ある。この本発明の光ディスク用基板は、案内溝２が存
在する側（以下、「表面」と言う。）は平坦であるが、
案内溝２が存在しない側（以下、「裏面」と言う。）
は、グルーブ部３およびミラー部４より外側にかからな
い点から基板の外端に向かって連続的に厚さを増す部分
を持つように射出成形によって作製されている。(Embodiment 1) FIG. 1 is a schematic sectional view of a magneto-optical type optical disk substrate of the present invention made of polycarbonate. The optical disk substrate of the present invention is flat on the side where the guide groove 2 is present (hereinafter referred to as the "front surface"),
The side where the guide groove 2 does not exist (hereinafter referred to as "back surface")
Is manufactured by injection molding so as to have a portion that continuously increases in thickness toward the outer end of the substrate from the point that it does not extend outside the groove portion 3 and the mirror portion 4.

【００１１】図１に示す本発明の光ディスク用基板を１
００枚、スタッカーポールに積み重ねた後、取り外して
表面を観察したところ、傷、スジなどは見られなかっ
た。また、この基板を用いてスピンコーターで基板の裏
面に傷つき防止のコーティング（ハードコーティング）
を行った際にも、塗りむらは見られなかった。The optical disk substrate of the present invention shown in FIG.
After stacking 00 sheets on a stacker pole, the sheets were removed and the surface was observed. No scratches or streaks were found. Also, using this substrate, a spin coater is applied to the back surface of the substrate to prevent scratches (hard coating).
When applying, no uneven coating was observed.

【００１２】さらに、図１に示す本発明の光ディスク用
基板を用いて作製した光磁気形の光ディスクのバイトエ
ラーレートを測定したところ１×１０-5以下であり、従
来の光ディスク用基板を用いた場合と同様であった。Further, the bit error rate of the magneto-optical disc manufactured by using the optical disc substrate of the present invention shown in FIG. 1 was measured and found to be 1 × 10 −5 or less, and the conventional optical disc substrate was used. It was similar to the case.

【００１３】（実施例２）図２は、基板の表面と裏面の
両面の外端部がグルーブ部３およびミラー部４にかから
ない点から基板の外端に向かって連続的に厚さを増す部
分を持つように射出成形によって作製したポリカーボネ
ート製で光磁気形の本発明の光ディスク用基板の模式断
面図である。(Embodiment 2) FIG. 2 shows a portion in which the outer edges of both the front surface and the back surface of the substrate do not overlap the groove portion 3 and the mirror portion 4, and the thickness increases continuously toward the outer edge of the substrate. FIG. 4 is a schematic cross-sectional view of a magneto-optical type optical disk substrate of the present invention made of polycarbonate and manufactured by injection molding.

【００１４】実施例１と同様にして、図２に示す本発明
の光ディスク用基板の表面を観察したところ、傷、スジ
などは見られなかった。また、この基板を用いてスピン
コーターで基板の裏面に傷つき防止のコーティング（ハ
ードコーティング）を行った際にも、塗りむらは見られ
なかった。When the surface of the optical disk substrate of the present invention shown in FIG. 2 was observed in the same manner as in Example 1, no scratches or streaks were found. No uneven coating was observed when a scratch-preventing coating (hard coating) was applied to the back surface of the substrate using a spin coater using this substrate.

【００１５】さらに、実施例１と同様にして、図２に示
す本発明の光ディスク用基板を用いて作製した光磁気形
の光ディスクのバイトエラーレートを測定したところ１
×１０-5以下であり、従来の光ディスク用基板を用いた
場合と同様であった。Further, the bit error rate of the magneto-optical disc manufactured by using the optical disc substrate of the present invention shown in FIG.
The value was × 10 -5 or less, which was the same as when the conventional optical disk substrate was used.

【００１６】（比較例１）図３は、ポリカーボネート製
で光磁気形の従来の光ディスク用基板（以下、「従来基
板」と言う。）の模式断面図である。(Comparative Example 1) FIG. 3 is a schematic cross-sectional view of a conventional magneto-optical type optical disk substrate made of polycarbonate (hereinafter referred to as "conventional substrate").

【００１７】実施例１と同様にして、この従来基板の表
面を観察したところ、傷が見られた。When the surface of this conventional substrate was observed in the same manner as in Example 1, scratches were found.

【００１８】実施例１および２と比較例１から明らかな
ように、本発明の光ディスク用基板は、その断面形状に
より、従来基板と同様な特性を保持しながら、基板を積
み重ねた際に表面に発生する傷、スジを防止できる。As is apparent from Examples 1 and 2 and Comparative Example 1, the optical disc substrate of the present invention has the same characteristics as the conventional substrate due to its cross-sectional shape, but when the substrates are stacked on the surface, Scratches and streaks that occur can be prevented.

【００１９】[0019]

【発明の効果】本発明の光ディスク用基板は、基板を積
み重ねた際に案内溝などの情報信号部分の損傷を防止で
きる。特に、光磁気形の光ディスク用基板においては、
従来使用されているスペーサー等の部品を用いることな
く基板を積み重ねたまま、ストックすることが可能であ
り、このスペーサー等のコストと、これを外すためのコ
ストを省くことができ、生産コストを低減すると同時に
生産性が向上する。The optical disk substrate of the present invention can prevent the information signal portion such as the guide groove from being damaged when the substrates are stacked. In particular, in the magneto-optical type optical disk substrate,
It is possible to stock the substrates while stacking them without using the parts such as the spacers that have been used conventionally. It is possible to save the cost of this spacer and the cost for removing it, and reduce the production cost. At the same time, productivity is improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の光ディスク用基板の一例を示す模式断
面図である。FIG. 1 is a schematic cross-sectional view showing an example of an optical disk substrate of the present invention.

【図２】本発明の光ディスク用基板の一例を示す模式断
面図である。FIG. 2 is a schematic cross-sectional view showing an example of an optical disk substrate of the present invention.

【図３】従来の光ディスク用基板の一例を示す模式断面
図である。FIG. 3 is a schematic cross-sectional view showing an example of a conventional optical disk substrate.

【符号の説明】[Explanation of symbols]

１ 中心穴 ２ 案内溝 ３ グルーブ部 ４ ミラー部 1 center hole 2 guide groove 3 groove part 4 mirror part

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 光ディスク用基板において、外端部がそ
の他の部分より厚いことを特徴とする光ディスク用基
板。1. An optical disc substrate, wherein the outer end portion is thicker than the other portions. 【請求項２】 前記基板の厚さの変化が連続的であり且
つ前記基板面上に段差部を持たないことを特徴とする請
求項１記載の光ディスク用基板。2. The optical disk substrate according to claim 1, wherein the thickness of the substrate is continuously changed and there is no step on the surface of the substrate.
JP5060180A 1993-03-19 1993-03-19 Optical disk substrate Pending JPH06274936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5060180A JPH06274936A (en) 1993-03-19 1993-03-19 Optical disk substrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5060180A JPH06274936A (en) 1993-03-19 1993-03-19 Optical disk substrate

Publications (1)

Publication Number Publication Date
JPH06274936A true JPH06274936A (en) 1994-09-30

Family

ID=13134707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5060180A Pending JPH06274936A (en) 1993-03-19 1993-03-19 Optical disk substrate

Country Status (1)

Country Link
JP (1) JPH06274936A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020074543A (en) * 2001-03-20 2002-10-04 김지웅 CD which is seldom scratched
US6965492B2 (en) * 2001-03-29 2005-11-15 Matsushita Electric Industrial Co., Ltd. Rotor assembly, information-recording/-reproducing device using the rotor assembly and method of assembling the rotor assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020074543A (en) * 2001-03-20 2002-10-04 김지웅 CD which is seldom scratched
US6965492B2 (en) * 2001-03-29 2005-11-15 Matsushita Electric Industrial Co., Ltd. Rotor assembly, information-recording/-reproducing device using the rotor assembly and method of assembling the rotor assembly

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