JPH05325254A - Substrate for optical information recording medium and its manufacture - Google Patents

Substrate for optical information recording medium and its manufacture

Info

Publication number
JPH05325254A
JPH05325254A JP4148696A JP14869692A JPH05325254A JP H05325254 A JPH05325254 A JP H05325254A JP 4148696 A JP4148696 A JP 4148696A JP 14869692 A JP14869692 A JP 14869692A JP H05325254 A JPH05325254 A JP H05325254A
Authority
JP
Japan
Prior art keywords
substrate
recording medium
information recording
region
optical information
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
JP4148696A
Other languages
Japanese (ja)
Inventor
Kazuhiro Kotaka
一広 小鷹
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4148696A priority Critical patent/JPH05325254A/en
Publication of JPH05325254A publication Critical patent/JPH05325254A/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)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

PURPOSE:To provide a substrate not requiring a thick film region removal process after completing the coating process of recording film. CONSTITUTION:When in the substrate 1 having a projection part 2 on a peripheral end, a spin coating is applied, a region locally thick in a coating film thickness is liable to occur. A circular groove 3 is formed near the peripheral end on the side to be coated in order to prevent it. In the case of coating the recording material, a stagnating region of the coating fluid is produced but the stagnating fluid flows into the circular groove 3 and a region adhering to a spacer becomes uniform in the film thickness and the adhering state is not affected.

Description

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

【０００１】[0001]

【技術分野】本発明は、光学的情報記録媒体用基板及び
その製造方法に関し、より詳細には、有機系記録材料を
有する光ディスクや光カード等の光学的情報記録媒体用
基板及びその製造方法に関する。TECHNICAL FIELD The present invention relates to a substrate for an optical information recording medium and a manufacturing method thereof, and more particularly to a substrate for an optical information recording medium such as an optical disk and an optical card having an organic recording material and a manufacturing method thereof. ..

【０００２】[0002]

【従来技術】エアサンドイッチ構造をもつ光学的情報記
録媒体では、記録媒体の内外周部をスペーサを介して接
着する必要がある。一方、有機系記録材料を用いた記録
媒体は、スピンコート法により成膜を行っている。円盤
状の媒体基板に、スピンコート法によって記録膜を成膜
すると、基板の外周部で膜厚が著しく厚くなる領域が発
生し、この領域は前述のスペーサ接着領域にあたる。ス
ペーサを接着する場合、有機系記録材料は接着力を低下
させる原因となり、厚膜領域の除去が必要となってく
る。2. Description of the Related Art In an optical information recording medium having an air sandwich structure, it is necessary to bond the inner and outer peripheral portions of the recording medium with spacers. On the other hand, a recording medium using an organic recording material is formed by a spin coating method. When the recording film is formed on the disk-shaped medium substrate by the spin coating method, a region where the film thickness is remarkably thickened occurs in the outer peripheral portion of the substrate, and this region corresponds to the spacer bonding region described above. When the spacers are bonded, the organic recording material causes a decrease in the adhesive force, and it becomes necessary to remove the thick film region.

【０００３】厚膜領域の除去方法としては、有機系記録
材料を溶解する溶剤に厚膜領域を接触させることによっ
て行っていた。例えば、特開昭６３−４７１９４号公報
に「光学的有機記録媒体の製造方法」が提案されてい
る。この公報のものは、基板に塗工液を塗布して記録層
を形成する工程に次いで、払拭する工程を連続して行
い、記録層の不要部分を容易に除去できるようにしたも
のである。The method for removing the thick film region has been to bring the thick film region into contact with a solvent that dissolves the organic recording material. For example, Japanese Unexamined Patent Publication No. 63-47194 proposes a "method for producing an optical organic recording medium". In this publication, a step of applying a coating liquid to a substrate to form a recording layer and then a step of wiping are continuously performed so that an unnecessary portion of the recording layer can be easily removed.

【０００４】光学的な情報記録媒体において、記録層を
成膜する工程は種々の工法があり、これらの工法は成膜
される記録層により決定される。その中で、有機系薄膜
を記録層とする記録媒体の工法は、設備コストや製造タ
クトの点からスピンコート法が広く用いられている。一
方、記録媒体用の基板は、材料コストや製造タクトの点
から高分子材料（一般にはポリカーボネイト樹脂）を射
出成形して製造されている。この両者の組み合わせによ
る成膜工程で問題となるのが、以下の点である。In an optical information recording medium, there are various methods for forming a recording layer, and these methods are determined by the recording layer to be formed. Among them, the spin coating method is widely used as a method for manufacturing a recording medium having an organic thin film as a recording layer in terms of equipment cost and manufacturing tact. On the other hand, a substrate for a recording medium is manufactured by injection molding a polymer material (generally a polycarbonate resin) in terms of material cost and manufacturing tact. The following points are problems in the film forming process by the combination of both.

【０００５】すなわち、図３に示すように、射出成形法
により基板１１の外周端には、突起部１２が少なからず
存在する。この突起部１２は基板成形に使用する金型の
構造的な原因に起因している。すなわち、金型内で樹脂
が注入される密閉された空間は、厳密には空間内の大気
やガスを排出する微細なクリアランスが存在し、そのク
リアランスに注入樹脂が流入して突起部分を形成する。
高品質な基板を得るためには、金型空間内へのスムーズ
な樹脂の注入が求められ、そのためには、空間内の大気
（ガス）を空間外へ排出するクリアランスは必ず設けな
ければならない。つまり、外周端の突起部１２は少なか
らず発生してしまう。That is, as shown in FIG. 3, a large number of protrusions 12 are present on the outer peripheral edge of the substrate 11 by the injection molding method. The protrusion 12 is caused by the structural cause of the mold used for molding the substrate. That is, strictly speaking, the sealed space in which the resin is injected has a minute clearance for discharging the atmosphere and gas in the space, and the injected resin flows into the clearance to form a protruding portion. ..
In order to obtain a high quality substrate, it is required to smoothly inject the resin into the mold space, and for that purpose, a clearance for exhausting the atmosphere (gas) in the space to the outside must be provided. That is, the protrusions 12 at the outer peripheral edge are not a little generated.

【０００６】このような突起部分を持つ基板にスピンコ
ートを施すと、図４に示すような外周端で局部的に成膜
厚の厚い領域１３が発生してしまう。原因は、上述の外
周端突起部により記録材料を溶かし込んだ溶剤がせき止
められ、図５に示すような液だまり１４が生じることに
よる。この液だまりの状態は、溶剤の揮発性にも左右さ
れ、揮発速度の遅い溶剤（例えば、アルコール系）で
は、液だまりの領域は広くなってしまう。When a substrate having such a protruding portion is spin-coated, a region 13 having a large film thickness locally occurs at the outer peripheral edge as shown in FIG. The cause is that the solvent in which the recording material is melted is stopped by the above-mentioned outer peripheral edge projections, and the liquid pool 14 as shown in FIG. 5 is generated. The state of this liquid pool is also affected by the volatility of the solvent, and in the case of a solvent with a slow volatilization rate (for example, alcohol type), the region of the liquid pool becomes large.

【０００７】基板外周端に生じる液だまり領域（厚い膜
厚領域）は、エアサンドイッチ方式の光ディスクでは構
造上封止スペーサを接着する領域であり、スペーサとの
接着強度を確保する上で、または記録媒体の信頼性にお
いて、大きな障害となっていた。通常、この液だまり領
域は、記録材料の塗布工程後、塗布に用いた溶剤により
再び溶かして除去していた。ところが、この方法では、
除去溶剤のミスト等がすでに塗布された本来の記録領域
に飛散してしまい、歩留りを低下させる原因となり、極
めて危険を供う方法であった。The liquid pool region (thick film thickness region) generated at the outer peripheral edge of the substrate is a region where the sealing spacer is bonded structurally in the air sandwich type optical disk, and in order to secure the bonding strength with the spacer or to record. It has been a major obstacle to the reliability of the medium. Usually, this liquid pool area was removed by dissolving it again with the solvent used for coating after the recording material coating step. However, with this method,
This is a very dangerous method because the mist of the removal solvent is scattered on the original recording area which has already been applied, which causes a decrease in yield.

【０００８】[0008]

【目的】本発明は、上述のごとき実情に鑑みてなされた
もので、記録膜の塗布工程完了後に行われていた厚い膜
厚領域の除去工程を経ずとも、封止工程において障害と
ならない塗布状態となる光学的情報記録媒体用基板及び
その製造方法を提供することを目的としてなされたもの
である。[PROBLEMS] The present invention has been made in view of the above-mentioned circumstances, and coating that does not hinder the sealing process even without the removal process of the thick film thickness region that has been performed after the recording film coating process is completed. The present invention has been made for the purpose of providing a substrate for an optical information recording medium and a method for manufacturing the same.

【０００９】[0009]

【構成】本発明は、上記目的を達成するために、（１）
光学的に情報の読み取り，書き込み，または消去を行う
光学的情報記録媒体用基板において、記録媒体基板の情
報記録層が形成される側の外周端付近に、連続した環状
溝を有すること、更には、（２）光学的に情報の読み取
り、書き込み，又は消去を行う光学的情報記録媒体用基
板の製造方法において、記録媒体基板の情報記録層の形
成される側の外周端付近に設けられる環状溝が、基板の
製造工程と同様に形成されること、更には、（３）光学
的に情報の読み取り、書き込み，又は消去を行う光学的
情報記録媒体用基板の製造方法において、記録媒体基板
の情報記録層の形成される側の外周端付近に設けられる
環状溝が、基板の製造工程の後、別工程加工により形成
されることを特徴としたものである。以下、本発明の実
施例に基づいて説明する。In order to achieve the above object, the present invention provides (1)
In an optical information recording medium substrate for optically reading, writing, or erasing information, it has a continuous annular groove near the outer peripheral end of the recording medium substrate on the side where the information recording layer is formed, and (2) In a method of manufacturing an optical information recording medium substrate for optically reading, writing, or erasing information, an annular groove provided near the outer peripheral end of the recording medium substrate on the side where the information recording layer is formed. Is formed in the same manner as in the substrate manufacturing process, and further, (3) in the method for manufacturing an optical information recording medium substrate for optically reading, writing, or erasing information, the information of the recording medium substrate is The annular groove provided in the vicinity of the outer peripheral end on the side where the recording layer is formed is formed by a separate process after the substrate manufacturing process. Hereinafter, description will be given based on examples of the present invention.

【００１０】図１は、本発明による光学的情報記録媒体
用基板の一実施例を説明するための構成図で、図中、１
は基板、２は外周端突起部、３は環状溝である。射出成
形法による基板１の外周端には、突起部２が存在するこ
とがある。このような外周端に突起部２を有する基板に
おいては、スピンコートを施すと、局部的に成膜厚の厚
い領域が発生してしまうので、それを防止するために、
記録材の塗布面側の外周端付近に環状溝３を設ける。記
録材の塗布工程時においては、図２に示すように、液だ
まりの領域４が生じるが、その液だまりは、図５に示す
ような広範囲にわたるものではない。それは、前記環状
溝３の中に塗布液が流れ込むため、スペーサとの接着領
域は均一の膜厚となっており、接着状態に影響を及ぼす
ものではない。FIG. 1 is a block diagram for explaining an embodiment of a substrate for an optical information recording medium according to the present invention.
Is a substrate, 2 is an outer peripheral end protrusion, and 3 is an annular groove. The projection 2 may be present on the outer peripheral edge of the substrate 1 formed by the injection molding method. In such a substrate having the protrusions 2 on the outer peripheral edge, when spin coating is performed, locally a region with a large film thickness is generated. Therefore, in order to prevent this,
An annular groove 3 is provided near the outer peripheral edge of the recording material on the coated surface side. At the time of applying the recording material, a liquid pool region 4 is generated as shown in FIG. 2, but the liquid pool is not wide as shown in FIG. This is because the coating liquid flows into the annular groove 3, so that the adhesion region with the spacer has a uniform film thickness and does not affect the adhesion state.

【００１１】なお、本発明による環状溝の形状は、塗布
条件によりさまざまな形状をとり得る。すなわち、所定
の塗布膜厚を得るために、基板の回転速度が決定され、
更にその関係から溶剤中の記録材料の濃度が決定され
る。これらの因子から、液だまり発生の範囲やその領域
の記録材の膜厚が決まり、その状態を回避するための形
状で環状溝を決定しなければならない。The shape of the annular groove according to the present invention can take various shapes depending on the coating conditions. That is, the rotation speed of the substrate is determined in order to obtain a predetermined coating film thickness,
Further, the relationship determines the concentration of the recording material in the solvent. From these factors, the range of liquid pool generation and the film thickness of the recording material in that region are determined, and the annular groove must be determined with a shape for avoiding this state.

【００１２】次に、上記の結果から決定された環状溝の
形成方法を示す。一般には、媒体そのものは射出成形法
により作製するため、成形金型の内部に、基板上で環状
溝と対応する領域に凸部を設けて基板成形を行う。この
方法により、基板の成形と環状溝の形成は同一工程で完
了する。また、エッチングにより媒体基板を製造する工
程においても同様の考え方で対処できる。しかしなが
ら、液だまりの状態から決定された環状溝の形状が射出
成形で同時形成することが困難な場合（例えば、溝が深
い等）には、成形された基板を機械的切削加工で形成す
ればよい。Next, a method of forming the annular groove determined from the above results will be shown. In general, since the medium itself is produced by the injection molding method, the substrate is molded by providing a convex portion inside the molding die in a region corresponding to the annular groove on the substrate. By this method, the molding of the substrate and the formation of the annular groove are completed in the same step. Further, the same idea can be applied to the step of manufacturing the medium substrate by etching. However, if it is difficult to simultaneously form the annular groove shape determined from the state of the liquid pool by injection molding (for example, the groove is deep), the molded substrate should be formed by mechanical cutting. Good.

【００１３】[0013]

【効果】以上の説明から明らかなように、本発明による
と、以下のような効果がある。 （１）記録材料を塗布した記録媒体を再び溶解溶剤に接
触させることなくスペーサ接着強度を確保できる。 （２）環状溝は、媒体基板の製造時の同一工程で形成す
ることが可能で、従来の除去工程を削除することが可能
となる。 （３）環状溝の形状はさまざまに形成することができる
ため、多種多様な塗布状態に対応することが可能とな
る。[Effect] As is apparent from the above description, the present invention has the following effects. (1) The adhesive strength of the spacer can be secured without bringing the recording medium coated with the recording material into contact with the dissolving solvent again. (2) The annular groove can be formed in the same process when manufacturing the medium substrate, and the conventional removal process can be omitted. (3) Since the annular groove can be formed in various shapes, it is possible to cope with various coating states.

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

【図１】 本発明による光学的情報記録媒体用基板の一
実施例を説明するための構成図である。FIG. 1 is a configuration diagram for explaining an embodiment of a substrate for an optical information recording medium according to the present invention.

【図２】 本発明による塗布工程時の様子を示す図であ
る。FIG. 2 is a diagram showing a state during a coating process according to the present invention.

【図３】 従来の光学的情報記録媒体用基板を示す図で
ある。FIG. 3 is a diagram showing a conventional optical information recording medium substrate.

【図４】 従来の塗布工程時の厚膜領域の発生を示す図
である。FIG. 4 is a diagram showing generation of a thick film region during a conventional coating process.

【図５】 従来の塗布工程時の液だまりの発生を示す図
である。FIG. 5 is a diagram showing the occurrence of a liquid pool during a conventional coating process.

【符号の説明】[Explanation of symbols]

１…基板、２…外周端突起部、３…環状溝。 1 ... Substrate, 2 ... Peripheral end protrusion, 3 ... Annular groove.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 光学的に情報の読み取り、書き込み、ま
たは消去を行う光学的情報記録媒体用基板において、記
録媒体基板の情報記録層が形成される側の外周端付近
に、連続した環状溝を有することを特徴とする光学的情
報記録媒体用基板。1. In an optical information recording medium substrate for optically reading, writing, or erasing information, a continuous annular groove is formed in the vicinity of the outer peripheral end of the recording medium substrate on the side where the information recording layer is formed. A substrate for an optical information recording medium having. 【請求項２】 光学的に情報の読み取り、書き込み、又
は消去を行う光学的情報記録媒体用基板の製造方法にお
いて、記録媒体基板の情報記録層の形成される側の外周
端付近に設けられる環状溝が、基板の製造工程と同様に
形成されることを特徴とする光学的情報記録媒体用基板
の製造方法。2. In a method for manufacturing an optical information recording medium substrate for optically reading, writing, or erasing information, a ring provided near the outer peripheral end of the recording medium substrate on the side where the information recording layer is formed. A method of manufacturing a substrate for an optical information recording medium, wherein the groove is formed in the same manner as in the manufacturing process of the substrate. 【請求項３】 光学的に情報の読み取り、書き込み、又
は消去を行う光学的情報記録媒体用基板の製造方法にお
いて、記録媒体基板の情報記録層の形成される側の外周
端付近に設けられる環状溝が、基板の製造工程の後、別
工程加工により形成されることを特徴とする光学的情報
記録媒体用基板の製造方法。3. In a method for manufacturing an optical information recording medium substrate for optically reading, writing, or erasing information, a ring provided near the outer peripheral end of the recording medium substrate on the side where the information recording layer is formed. A method of manufacturing a substrate for an optical information recording medium, wherein the groove is formed by a separate process after the substrate manufacturing process.
JP4148696A 1992-05-15 1992-05-15 Substrate for optical information recording medium and its manufacture Pending JPH05325254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4148696A JPH05325254A (en) 1992-05-15 1992-05-15 Substrate for optical information recording medium and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4148696A JPH05325254A (en) 1992-05-15 1992-05-15 Substrate for optical information recording medium and its manufacture

Publications (1)

Publication Number Publication Date
JPH05325254A true JPH05325254A (en) 1993-12-10

Family

ID=15458558

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4148696A Pending JPH05325254A (en) 1992-05-15 1992-05-15 Substrate for optical information recording medium and its manufacture

Country Status (1)

Country Link
JP (1) JPH05325254A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245363A1 (en) * 2001-03-30 2002-10-02 TDK Corporation Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper
KR101243134B1 (en) * 2011-03-24 2013-03-13 주식회사 엔티에스 Lighting device, method for processing substrate for lighting device and processed substrate for lighting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245363A1 (en) * 2001-03-30 2002-10-02 TDK Corporation Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper
US6815029B2 (en) 2001-03-30 2004-11-09 Tdk Corporation Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper
US6835435B2 (en) 2001-03-30 2004-12-28 Tdk Corporation Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper
KR101243134B1 (en) * 2011-03-24 2013-03-13 주식회사 엔티에스 Lighting device, method for processing substrate for lighting device and processed substrate for lighting device

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