JPH04153929A - Production of sticking type optical recording medium - Google Patents

Production of sticking type optical recording medium

Info

Publication number
JPH04153929A
JPH04153929A JP2276864A JP27686490A JPH04153929A JP H04153929 A JPH04153929 A JP H04153929A JP 2276864 A JP2276864 A JP 2276864A JP 27686490 A JP27686490 A JP 27686490A JP H04153929 A JPH04153929 A JP H04153929A
Authority
JP
Japan
Prior art keywords
optical
hot melt
bonded
melt adhesive
recording
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
JP2276864A
Other languages
Japanese (ja)
Inventor
Kouichi Shiyouko
弘一 昌子
Chihiro Aoki
青木　千尋
Katsuya Yasuda
安田　勝也
Seiji Mizumoto
清治 水元
Yasushi Omori
康司 大森
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.)
Daicel Corp
Original Assignee
Daicel Chemical Industries 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 Daicel Chemical Industries Ltd filed Critical Daicel Chemical Industries Ltd
Priority to JP2276864A priority Critical patent/JPH04153929A/en
Publication of JPH04153929A publication Critical patent/JPH04153929A/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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B29C66/452—Joining of substantially the whole surface of the articles the article having a disc form, e.g. making CDs or DVDs
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72324—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of inorganic materials not provided for in B29C66/72321 - B29C66/72322
    • B29C66/72325—Ceramics
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B29C66/72343—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for liquids
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
    • B29C66/73941—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset characterised by the materials of both parts being thermosets
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs
    • B29L2017/005—CD''s, DVD''s

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

PURPOSE:To improve the strength of adhesion of inner and outer peripheral parts without allowing optical disk substrates to peel from each other during a post treatment and to suppress the infiltration of the atm. air into adhesive layers by applying ultrasonic vibrations to a part or the entire surface of the substrates at the time of sticking two sheets of optical recording media. CONSTITUTION:After the hot melt adhesive layers 7 in a molten state are applied on one surface of the respective optical disks by using a roll coater, the respective hot melt adhesive layers are brought into pressurized contact with each other in such a manner that these layers face each other; thereafter, the resulted assemblages 1, 7, 1 are placed on an ultrasonic wave receiving base 10. Such concentrical projections that only the inner and other non- recording regions are supported are provided on the receiving base 10. An ultrasonic horn 11 is then brought into contact with the front surfaces of the assemblages 1, 7, 1 from above and a pressure is applied to the ultrasonic horn 11 to apply the ultrasonic vibrations to the assemblages 1, 7, 1. The strength of adhesion of the inner and other peripheral parts is improved without allowing the optical disk substrates 1 to be peeled from each other during the post treatment and the infiltration of the atm. air to the adhesive layers is suppressed.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は貼り合せ型光学的記録媒体の製造方法に関する
ものであり、特に、２枚の光学的記録媒体をホットメル
ト接着剤を用いて互いに接着した構造の光学的記録媒体
、特に光ディスクに関するものである。なお、本発明の
光学的記録媒体は光ディスクに限らず、光カード等の任
意の形状のメディアに適用することができるが、以下、
光ディスクを例にとって説明する。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for manufacturing a bonded optical recording medium, and in particular, to a method for manufacturing a bonded optical recording medium, in particular, a method for manufacturing a bonded optical recording medium, in which two optical recording media are bonded together using a hot melt adhesive. The present invention relates to structured optical recording media, in particular optical discs. Note that the optical recording medium of the present invention is not limited to optical discs, but can be applied to media of any shape such as optical cards.
This will be explained using an optical disc as an example.

従来の技術 プラスチックまたはガラス等の透明基板に反射層または
記録層を設け、レーザービームを用いて情報の記録・再
生を行う光ディスクは既に広く実用化されている。この
光ディスクは記録・再生方式によって再生専用型、追記
型または書換可能型と呼ばれている。一般に、追記型ま
たは書換可能型の光ディスクでは各記録層が互いに対向
した状態で２枚のディスクがホットメルト接着剤を用い
て接着されている。この場合、２枚のディスクの間にス
ペーサを挿入して２つの記録層が互いに直接接触しない
ようにした構造（エアーサンドイッチ型）と、２つの記
録層をホットメルト接着剤を用いて直接接着させた構造
（全面貼り合せ型または密着貼り合せ型）が−船釣であ
る。2. Description of the Related Art Optical discs, in which a reflective layer or a recording layer is provided on a transparent substrate such as plastic or glass, and information is recorded and reproduced using a laser beam, have already been widely put into practical use. This optical disk is called a read-only type, a write-once type, or a rewritable type, depending on the recording/reproducing method. Generally, in a write-once type or rewritable type optical disk, two disks are bonded together using a hot melt adhesive with each recording layer facing each other. In this case, a spacer is inserted between two disks to prevent the two recording layers from coming into direct contact with each other (air sandwich type), and the two recording layers are directly bonded using hot melt adhesive. The structure (fully laminated type or closely laminated type) is - boat fishing.

一般に、ホットメルト接着剤は加熱溶融された状態でロ
ールコータ−を用いて塗布される。すなわち、密着貼り
合せ型の場合には、加熱溶融されたホットメルト接着剤
を各光ディスクの記録層上にロールコータを用いて直接
塗布し、ホ・ソトメルト接着層を互いに対向・圧着する
。一方、エアーサンドイッチ型の場合には、加熱溶融さ
れたホットメルト接着剤を内周スペーサーと外周スペー
サーの上下面に塗布し、これらのスペーサーを介して２
枚の光ディスクを互いに対向・圧着する。Generally, hot melt adhesives are applied in a heated and molten state using a roll coater. That is, in the case of the close bonding type, a heated and melted hot melt adhesive is directly applied onto the recording layer of each optical disk using a roll coater, and the hot melt adhesive layers are faced and pressed together. On the other hand, in the case of the air sandwich type, hot melt adhesive is applied to the upper and lower surfaces of the inner spacer and the outer spacer, and the two are bonded through these spacers.
Two optical discs are placed facing each other and pressed together.

いずれの構造の場合でも、ロールコータを用いて加熱溶
融状態のホットメルト接着層を塗布・圧着して貼り合せ
た接着部分は、ホットメルト接着層が冷却固化した後の
外観が透明な部分および白色不透明な部分が不規則に分
布したものとなる。In either structure, the adhesive part that is bonded by applying and pressing the hot melt adhesive layer in a heated molten state using a roll coater will have a transparent appearance and a white color after the hot melt adhesive layer has cooled and solidified. The opaque areas are irregularly distributed.

すなわち、貼り合せ後の光ディスクの記録領域以外の部
分、特に、レーベルで隠すことができないディスク外周
部の外観が不均一となり、商品価値を著しく低下させて
いる。That is, the appearance of the parts other than the recording area of the optical disc after bonding, especially the outer periphery of the disc which cannot be hidden by a label, becomes uneven, which significantly reduces the commercial value.

しかも、この白色不透開部分は、空気の微細な泡が混入
して生じるため、この部分の接着強度は弱くなり、特に
接着部の耐熱性が乏しくなるという問題点がある。Moreover, since this white opaque portion is generated by the inclusion of fine air bubbles, the adhesive strength of this portion is weakened, and there is a problem in that the heat resistance of the bonded portion is particularly poor.

本発明者達は特開昭６３−１２９５４４号において、ロ
ールコータを用いてホットメルト接着剤を塗布した後に
ロールコータのロールと同じ温度で熱を加える後処理を
することによって記録膜の保護層を透明化し、それによ
って商品の外観を高釣ると共に、言己録膜の酸化に起因
するピンホールの発生を大幅に減少させて、製品の長期
信頼性を向上させる方法を提供した。しかし、この方法
で記録層を対向させて２枚の光ディスクをホットメルト
接着層を介して貼り合せたものはロールコータと同じ温
度で熱を加える後処理をしなければならないため、２枚
の光ディスクに応力歪み（バイメタル現象）が生じ、熱
処理中に剥がれてしまう場合があることが分かった。In JP-A No. 63-129544, the inventors of the present invention coated a hot melt adhesive using a roll coater and then applied heat at the same temperature as the roll of the roll coater to form a protective layer of the recording film. We have provided a method to improve the long-term reliability of products by making them transparent, thereby improving the appearance of products, and significantly reducing the occurrence of pinholes caused by oxidation of the film. However, this method, in which two optical discs are bonded together via a hot melt adhesive layer with the recording layers facing each other, requires post-processing by applying heat at the same temperature as a roll coater. It was found that stress distortion (bimetallic phenomenon) occurs in the metal, which may cause it to peel off during heat treatment.

発明が解決しようとする課題 本発明の目的は、上記欠点のない２枚の光ディスクの貼
り合せ方法を提供することにある。Problems to be Solved by the Invention An object of the present invention is to provide a method for bonding two optical disks together without the above-mentioned drawbacks.

課題を解決するための手段 本発明は、基板上に記録層を有する光学的記録媒体を２
枚用い、各記録層を互いに対向させた状態で、上記２枚
の光学的記録媒体を直接または空気層を介してホットメ
ルト接着剤を用いて貼り合せた貼り合せ型光学的記録媒
体の製造方法において、２枚の光学的記録媒体を貼り合
せる際に、少なくとも上記基板の一部分または全面に超
音波振動を付与することを特徴とする方法を提供する。Means for Solving the Problems The present invention provides two optical recording media having a recording layer on a substrate.
A method for producing a bonded optical recording medium, in which the two optical recording media are bonded directly or via an air layer using a hot melt adhesive, with each recording layer facing each other. provides a method characterized in that when bonding two optical recording media, ultrasonic vibration is applied to at least a portion or the entire surface of the substrate.

本発明方法によって貼り合された光ディスクの接着層は
透明で、しかも強い接着力を示す。The adhesive layer of the optical disc bonded by the method of the present invention is transparent and exhibits strong adhesive strength.

本発明の光学的記録媒体、特に光ディスクに用いられる
基板としては、強化ガラスまたはポリメチルメタアクリ
レート　（ＰＭＭＡ）　、ポリカーボネート（ＰＣ）、
アモルファスポリオレフィン等のプラスチック成形品が
用いられる。基板の寸法は外径が８６〜３００ｍ／ｍ、
内径が１５〜３５ｍ／ｍＳ厚さが１．２ｍ／ｍ程度であ
る。このドーナツ状基板の片面には、プレピットおよび
トラッキング用溝が幅０．８μ、深さ７５０人、ピッチ
１．６μ程度の同心円または渦巻状の凹凸信号で形成さ
れている。この凹凸信号面の上には、再生専用型の場合
にはアルミニウム等の金属薄膜が蒸着され、追記型と書
換え可能型の場合には一般に金属または色素等からなる
薄膜が形成される。これらの記録膜の厚さは１０００　
Ａ程度である。記録膜の上には、記録領域および内・外
周の非証録領域の全面を覆う、保護膜が形成されている
。この保護膜は金属酸化物、金属窒化物、紫外線硬化樹
脂、熱硬化樹脂等で構成され、その厚さは一般に１００
０人〜１０μ程度である。Substrates used in the optical recording medium of the present invention, particularly optical discs, include tempered glass, polymethyl methacrylate (PMMA), polycarbonate (PC),
Plastic molded products such as amorphous polyolefin are used. The dimensions of the board are 86 to 300 m/m in outer diameter,
The inner diameter is 15 to 35 m/mS and the thickness is about 1.2 m/m. On one side of this doughnut-shaped substrate, pre-pits and tracking grooves are formed with concentric or spiral concavo-convex signals having a width of 0.8 μm, a depth of 750 μm, and a pitch of about 1.6 μm. On this uneven signal surface, a thin film of metal such as aluminum is deposited in the case of read-only type, and a thin film made of metal or dye is generally formed in the case of write-once type and rewritable type. The thickness of these recording films is 1000
It is about A. A protective film is formed on the recording film to cover the entire surface of the recording area and the inner and outer non-recording areas. This protective film is composed of metal oxide, metal nitride, ultraviolet curing resin, thermosetting resin, etc., and its thickness is generally 100 mm.
Approximately 0 to 10μ.

ホットメルト接着剤はこの保護膜の上に塗布される。一
般に、このホットメルト接着剤は加熱溶融された状態で
ロールコータを用いて保護膜の上に塗布され、その後直
ちに（ホットメルト樹脂にタックがある状態で）、ホッ
トメルト接着層を互いに対向させて、２枚の光ディスク
が貼り合される。ホットメルト樹脂としては一般にエチ
レン酢酸ビニル共重合体系、合成ゴム系のものが用いら
れる。A hot melt adhesive is applied over this protective film. Generally, this hot melt adhesive is applied in a heated and molten state onto a protective film using a roll coater, and then immediately (while the hot melt resin has tack), the hot melt adhesive layers are placed facing each other. , two optical discs are bonded together. As hot melt resins, those based on ethylene vinyl acetate copolymer or synthetic rubber are generally used.

本発明の特徴は、２枚の光学的記録媒体を貼り合せる際
に、少なくとも上記基板の一部分または全面に超音波振
動を付与する点にある。A feature of the present invention is that when bonding two optical recording media together, ultrasonic vibration is applied to at least a portion or the entire surface of the substrate.

上記の超音波はそれ自体公知の超音波ホーンを用いて加
えることができる。特に、本発明者達が特開昭６３−１
３９７２７号および実關昭６：）−４５７２５号で提案
した超音波ホーンと超音波溶着側受は台とを用いるのが
好ましい。すなわち、貼り合せディスクの内・外周の非
記録領域のみに超音波振動を与えて、内、外周部で白化
した接着層を透明化するのが好ましい。The above-mentioned ultrasonic waves can be applied using an ultrasonic horn known per se. In particular, the inventors of the present invention
It is preferable to use a stand for the ultrasonic horn and ultrasonic welding side support proposed in No. 39727 and No. 6:)-45725. That is, it is preferable to apply ultrasonic vibration only to the non-recording areas on the inner and outer peripheries of the bonded disk to make the whitened adhesive layer transparent on the inner and outer peripheries.

この場合に付与する超音波振動のエネルギーは光ディス
クの基板の材質、寸法によって異なるが一般には、１０
．０００〜５０．０００七の周波数の振動を押圧力０，
５〜３ｋｇで０．１〜３．０秒の時間加えるのが適当で
ある。最適値は、実験によって当業者が極めて容易に見
出すことができる。The energy of the ultrasonic vibration applied in this case varies depending on the material and dimensions of the substrate of the optical disc, but is generally 10
．． 000~50.000 Seven frequency vibrations with a pressing force of 0,
It is appropriate to add 0.1 to 3.0 seconds for 5 to 3 kg. Optimum values can be found quite easily by a person skilled in the art by experiment.

以下、図面を参照して本発明を説明する。The present invention will be described below with reference to the drawings.

第１図は本発明の方法を実施するのに適した超音波振動
付与装置の概念図である。この図ではホントメルト接着
層７を介して互いに貼り合される２枚の光ディスクの基
板１のみが概念的に示しである。FIG. 1 is a conceptual diagram of an ultrasonic vibration applying apparatus suitable for carrying out the method of the present invention. In this figure, only the substrates 1 of two optical disks bonded to each other via the real-melt adhesive layer 7 are conceptually shown.

各光ディスクの片面にロールコータを用いて溶融状態の
ホットメルト接着層７を塗布した後、各ホットメルト接
着層が互いに対向圧着させた後、得られた集合体（Ｌ　
７．１）を超音波受は台１０に乗せる。この受は台１０
には内外の非記録領域のみが支持されるような同心円状
の突起が設けられている。次いで、この集合体（１，７
，１）の上面に、上から超音波ホーン１１を接触させ、
超音波ホーン１１に約３ｋｇの圧力を加え、約１．５秒
間、周波数２０．０００七の超音波振動を集合体（１，
７，１）　　に加える。超音波ホーン１１は上記の突起
に対応する同心円状の突起が設けられている。After applying the hot melt adhesive layer 7 in a molten state to one side of each optical disc using a roll coater, the hot melt adhesive layers are pressed against each other, and the obtained aggregate (L
7.1) is placed on the ultrasonic receiver stand 10. This receiver is stand 10
are provided with concentric protrusions that support only the inner and outer non-recording areas. Next, this aggregate (1,7
, 1), contact the ultrasonic horn 11 from above,
Approximately 3 kg of pressure is applied to the ultrasonic horn 11, and ultrasonic vibrations with a frequency of 20.0007 are applied to the ultrasonic horn 11 for approximately 1.5 seconds.
7. Add to 1). The ultrasonic horn 11 is provided with concentric protrusions corresponding to the above-mentioned protrusions.

この超音波振動を加えた光ディスクの内外周の非記録部
分８は白色から透明に変化する。The non-recording portions 8 on the inner and outer peripheries of the optical disk to which this ultrasonic vibration is applied change from white to transparent.

第２図は本発明方法が適用される密着貼り合せ型の光デ
ィスクの層構成を示す部分断面図である。FIG. 2 is a partial sectional view showing the layer structure of a closely bonded optical disc to which the method of the present invention is applied.

図示した貼り合せ型光ディスクは２枚の光ディスクをホ
ットメルト接着剤層７で互いに貼り合せたものである。The illustrated bonded optical disk is one in which two optical disks are bonded together using a hot melt adhesive layer 7.

各光ディスクは透明基板１上に反射防止兼防湿層２、記
録層３、保護層４、反射膜５および紫外線硬化樹脂の保
護層６がこの順番で積層されている。Each optical disk has an anti-reflection/moisture-proof layer 2, a recording layer 3, a protective layer 4, a reflective film 5, and a protective layer 6 made of ultraviolet curing resin laminated in this order on a transparent substrate 1.

以下、本発明の実施例を示す。Examples of the present invention will be shown below.

実施例１ 第２図に示す貼り合せ型光ディスクを製作した。Example 1 A bonded optical disc shown in FIG. 2 was manufactured.

先ず、ドーナツ状のトラッキング溝を有するポリカーボ
ネート系樹脂製の直径１３０ｍ／ｍφ、厚さ１２ｍ／ｍ
の基板１に反射防止兼防湿層２としての無機アルカリガ
ラス層を厚さ５００人だけマグネトロンスパッタリング
法で形成する。次に、記録層としてＧｄ５ＴｂＳＦｅＳ
Ｃｏよりなる光磁気記録膜３を同じくスパッタリング法
で７００Ａの厚さに形成する。この光磁気記録膜３の上
にＳｉ３Ｎ、よりなる保護層４を５００Ａの厚さに積層
し、さらにその上にアルミニウムの反射膜５を５００　
Ａの厚さにそれぞれスパッタリング法で形成した。次に
、＾１反射膜５の上に保護層６として紫外線硬化樹脂層
を１０μの厚さとなるように、スピンニートし、紫外線
（ＬＩＶ）照射してこの層を硬化させた。First, a polycarbonate resin material having a donut-shaped tracking groove with a diameter of 130 m/mφ and a thickness of 12 m/m
An inorganic alkali glass layer as an anti-reflection and moisture-proof layer 2 is formed on a substrate 1 to a thickness of 500 mm by magnetron sputtering. Next, Gd5TbSFeS was used as the recording layer.
A magneto-optical recording film 3 made of Co is also formed to a thickness of 700 Å using the sputtering method. On this magneto-optical recording film 3, a protective layer 4 made of Si3N is laminated to a thickness of 500 Å, and on top of that a reflective film 5 of aluminum is laminated to a thickness of 500 Å.
Each layer was formed to a thickness of A by a sputtering method. Next, an ultraviolet curable resin layer was formed as a protective layer 6 on the ^1 reflective film 5 to a thickness of 10 μm by spin-neating, and the layer was cured by irradiation with ultraviolet rays (LIV).

こうして得られた２枚の光ディスクの各保護層６の上に
ロールコータを用いてホットメルト接着剤（ＸＷ−３０
、東亜合成化学工業株式会社製）を２０μの厚さに塗布
し、直ちに図示していない貼り合せ治具とプレス機とを
用いて２枚の接着層７が対向するように１００ｋｇ／　
ｆの圧力で貼り合せた。得られた貼り合せ型光ディスク
組立体９の断面は第２図の構成となる。A hot melt adhesive (XW-30
, manufactured by Toagosei Kagaku Kogyo Co., Ltd.) to a thickness of 20 μm, and immediately using a bonding jig and a press machine (not shown), the two adhesive layers 7 were bonded at 100 kg/cm so that they faced each other.
They were bonded together at a pressure of f. The cross section of the obtained bonded optical disc assembly 9 has the structure shown in FIG.

次に、第１図に示す装置を用いて本発明方法により上記
で得られた貼り合せ型光ディスク組立体９の内外周の非
記録部分８を透明化した。Next, the non-recording portions 8 on the inner and outer peripheries of the bonded optical disc assembly 9 obtained above were made transparent by the method of the present invention using the apparatus shown in FIG.

すなわち、第１図に示す超音波用受は台１０上に貼り合
せ型光ディスク組立体９を載置し、上方から超音波ホー
ン１１を接触させ、３ｋｇの圧力で１．５秒間、２０．
０００　）１ｚの周波数の超音波振動を与えた。That is, in the ultrasonic receiver shown in FIG. 1, a bonded optical disk assembly 9 is placed on a stand 10, an ultrasonic horn 11 is brought into contact with it from above, and a pressure of 3 kg is applied for 1.5 seconds for 20 seconds.
Ultrasonic vibrations with a frequency of 000 ) 1z were applied.

その結果、光ディスクの内外周の非記録部分８は白色か
ら透明に変化した。As a result, the non-recording portions 8 on the inner and outer peripheries of the optical disc changed from white to transparent.

比較用として本発明方法の超音波振動を与えない貼り合
せ型光ディスクを製作した。For comparison purposes, a bonded optical disk was manufactured using the method of the present invention without applying ultrasonic vibration.

本発明方法により製作された貼り合せ型光ディスクおよ
び比較例の貼り合せ型光ディスクのクツキングテスト　
（耐久性テスト）を８０℃、８０％ＲＨの条件で１００
時間行なったところ、本発明方法により作られた貼り合
せ型光ディスクには異常は生じなかったが、比較例の貼
り合せ型光ディスクでは２４時間後に接着層７の外周部
に剥がれが認められた。Shoeing test of a laminated optical disc manufactured by the method of the present invention and a laminated optical disc of a comparative example
(durability test) under the conditions of 80℃ and 80%RH.
When tested for a period of time, no abnormality occurred in the bonded optical disk made by the method of the present invention, but in the bonded optical disk of the comparative example, peeling was observed at the outer periphery of the adhesive layer 7 after 24 hours.

発明の効果 本発明方法により光ディスクの内外周部の非記録領域に
超音波振動を加えてこの部分を透明化した貼り合せ型光
ディスクは、従来の加熱により後処理して透明化させる
方法に比べて、後処理中に光デイスク基板同志が剥がれ
ることがな（、内外周部の接着強度が向上し、接着層へ
の大気の浸入が抑えられる。従って、長期信頼性が向上
する。Effects of the Invention The bonded optical disc in which ultrasonic vibrations are applied to the non-recording areas on the inner and outer peripheries of the optical disc to make these areas transparent by the method of the present invention is superior to the conventional method of making the non-recording areas transparent by post-processing by heating. The optical disk substrates do not peel off from each other during post-processing (the adhesive strength at the inner and outer peripheries is improved, and the intrusion of air into the adhesive layer is suppressed. Therefore, long-term reliability is improved).

また、貼り合せ型光ディスクの外観を透明化することが
できるので、製品の見栄えが向上する。Furthermore, since the appearance of the bonded optical disc can be made transparent, the appearance of the product is improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明方法による貼り合せ型光ディスクの製造
方法を示す概念的断面図であり、第２図は、本発明方法
が適用される密着貼り合せ型光ディスクの一例を示す概
念的断面図である。 （主な参照番号） １・・基板、　　　　　　２・・防湿層３・・記録層、
　　　　４・・ＳｉＮ層（保護層）５・・＾１反射膜、
　　　　６・・ＵＶ樹脂保護層７・・ホットメルト接着
層 ８・・非記録領域 ９・・貼り合せ型光ディスク組立体FIG. 1 is a conceptual cross-sectional view showing a method for manufacturing a bonded optical disc according to the method of the present invention, and FIG. 2 is a conceptual cross-sectional view showing an example of a close bonding optical disk to which the method of the present invention is applied. be. (Main reference numbers) 1...Substrate, 2...Moisture-proof layer 3...Recording layer,
4...SiN layer (protective layer) 5...^1 reflective film,
6... UV resin protective layer 7... Hot melt adhesive layer 8... Non-recording area 9... Bonded optical disc assembly

Claims (1)

【特許請求の範囲】 基板上に記録層を有する光学的記録媒体を２枚用い、各
記録層を互いに対向させた状態で、上記２枚の光学的記
録媒体を直接または空気層を介してホットメルト接着剤
を用いて貼り合せた貼り合せ型光学的記録媒体の製造方
法において、 ２枚の光学的記録媒体を貼り合せる際に、少なくとも上
記基板の一部分または全面に超音波振動を付与すること
を特徴とする方法。[Claims] Two optical recording media each having a recording layer on a substrate are used, and with each recording layer facing each other, the two optical recording media are heated directly or through an air layer. In a method for manufacturing a bonded optical recording medium bonded using a melt adhesive, applying ultrasonic vibration to at least a portion or the entire surface of the substrate when bonding two optical recording media. How to characterize it.
JP2276864A 1990-10-16 1990-10-16 Production of sticking type optical recording medium Pending JPH04153929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2276864A JPH04153929A (en) 1990-10-16 1990-10-16 Production of sticking type optical recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2276864A JPH04153929A (en) 1990-10-16 1990-10-16 Production of sticking type optical recording medium

Publications (1)

Publication Number Publication Date
JPH04153929A true JPH04153929A (en) 1992-05-27

Family

ID=17575481

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2276864A Pending JPH04153929A (en) 1990-10-16 1990-10-16 Production of sticking type optical recording medium

Country Status (1)

Country Link
JP (1) JPH04153929A (en)

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