JPH03256247A - Optical disk - Google Patents
Optical diskInfo
- Publication number
- JPH03256247A JPH03256247A JP2055776A JP5577690A JPH03256247A JP H03256247 A JPH03256247 A JP H03256247A JP 2055776 A JP2055776 A JP 2055776A JP 5577690 A JP5577690 A JP 5577690A JP H03256247 A JPH03256247 A JP H03256247A
- Authority
- JP
- Japan
- Prior art keywords
- adhesive
- annular
- optical disk
- substrates
- sensitive adhesive
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 239000010410 layer Substances 0.000 claims abstract description 25
- 125000006850 spacer group Chemical group 0.000 claims abstract description 23
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims abstract description 17
- 239000004417 polycarbonate Substances 0.000 claims abstract description 13
- 239000003522 acrylic cement Substances 0.000 claims abstract description 10
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 8
- 229920000728 polyester Polymers 0.000 claims 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 20
- 230000001070 adhesive effect Effects 0.000 abstract description 20
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000012790 adhesive layer Substances 0.000 abstract description 10
- 230000002093 peripheral effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 4
- 239000004926 polymethyl methacrylate Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229920006267 polyester film Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は光ディスクに関し、特に内部の信号記録層に面
して空間が設けられたいわゆるエアーサンドイッチ型光
ディスクに関する。TECHNICAL FIELD The present invention relates to an optical disc, and more particularly to a so-called air sandwich type optical disc in which a space is provided facing an internal signal recording layer.
背景技術
従来から、エアーサンドイッチ型光ディスクとして信号
記録層を例えば有機系色素薄膜とした追記型光ディスク
が知られている。BACKGROUND ART Write-once optical discs have been known as air sandwich optical discs in which the signal recording layer is, for example, a thin organic dye film.
かかる光ディスクには、本願出願人による特願平1−1
1286号明細書に開示しであるように、その製造を容
易とするために円形基板及び環状スペーサを互いに感圧
性接着剤層を介して固着せしめた光ディスクがある。か
かる光ディスクの環状は、第2図(c)に示すように、
一対の円形基板5及び6間に環状接着部材13を介して
外周環状スペーサ2を挾んで形成されている。信号記録
層4は内部空間に面して両基板上に設けられている。Such an optical disc is disclosed in Japanese Patent Application No. 1-1 filed by the applicant of the present application.
As disclosed in Japanese Patent No. 1286, there is an optical disk in which a circular substrate and an annular spacer are bonded to each other via a pressure-sensitive adhesive layer in order to facilitate manufacturing. The annular shape of such an optical disc is as shown in FIG. 2(c).
An outer annular spacer 2 is sandwiched between a pair of circular substrates 5 and 6 with an annular adhesive member 13 interposed therebetween. The signal recording layer 4 is provided on both substrates facing the internal space.
円形基板5.6はPMMA (ポリメチルメタクリレー
ト)、PC(ポリカーボネート)等のプラスチック材料
からなる。The circular substrate 5.6 is made of a plastic material such as PMMA (polymethyl methacrylate) or PC (polycarbonate).
第1図の部分拡大断面図に示すように、スペーサ2付近
の周縁部分における環状接着部材13は、いわゆる両面
接着テープであり、ポリエステルフィルムからなる基材
13aと、基材の対向する両担持面に配置された2つの
シリコンラバーからなるシリコン系感圧性接着剤層13
bとから形成されている(シリコン系接着部材)。As shown in the partially enlarged cross-sectional view of FIG. 1, the annular adhesive member 13 in the peripheral portion near the spacer 2 is a so-called double-sided adhesive tape, and has a base material 13a made of a polyester film and both opposing support surfaces of the base material. A silicone-based pressure-sensitive adhesive layer 13 consisting of two silicone rubbers arranged in
(silicon adhesive member).
かかる光ディスクを形成する場合において第2図(a)
ないしくf)に示す如き順の工程で組立が行なわれる。In the case of forming such an optical disc, FIG. 2(a)
Assembling is performed in the order of steps as shown in f).
まず、第2図(a)に示すように、基板5を該信号記録
層が上方に向くように置き、これに、環状接着部材13
の基板担持面一方上からセパレータ(保護テープ)14
aを剥がした内外周スペーサの一組1及び2を、芯合わ
せをして位置決めしつつ固定する。First, as shown in FIG. 2(a), the substrate 5 is placed with the signal recording layer facing upward, and the annular adhesive member 13 is placed on it.
Separator (protective tape) 14 from above one side of the substrate supporting surface of
A pair of inner and outer circumferential spacers 1 and 2 from which parts a have been removed are aligned and positioned and fixed.
次に、第2図(b)に示すように、環状接着部側13の
基板担持面他方上からセパレータ14bを剥がし、信号
記録層4を担持した基板6を信号記録層か下方に向くよ
うに芯合わせをしつつ押圧して固定して(第2図(c)
)、エアーサンドイッチ型光ディスクを得る。Next, as shown in FIG. 2(b), the separator 14b is peeled off from the other substrate supporting surface on the annular adhesive side 13, and the substrate 6 carrying the signal recording layer 4 is placed so that the signal recording layer faces downward. Press and fix while aligning the center (Fig. 2 (c)
) to obtain an air sandwich type optical disc.
しかしなから、かかる光ディスクにおいては、遠心力や
自重によりその周縁部に力が加わると、周縁部分の基板
とスペーサとの間にずれが生じるという問題が生じた。However, in such an optical disk, when a force is applied to the peripheral portion due to centrifugal force or its own weight, a problem arises in that a shift occurs between the substrate and the spacer at the peripheral portion.
この力は弱いものの長期間に亘って光ディスクに負荷が
かかるので、このずれによって光ディスクが変形、偏心
してしまい、データの記録再生時にエラーか多くなる。Although this force is weak, it applies a load to the optical disk over a long period of time, and this shift causes the optical disk to become deformed and eccentric, resulting in more errors when recording and reproducing data.
発明の概要
[発明の目的]
本発明の目的は、製造が容易で強固なエアーサンドイッ
チ型光ディスクを提供することにある。Summary of the Invention [Object of the Invention] An object of the present invention is to provide an air sandwich type optical disk that is easy to manufacture and strong.
[発明の構成]
本発明の光ディスクは、少なくとも一方が信号記録層を
有する一対の円形基板と、前記信号記録層が内側となる
ように平行に対向すべく前記円形基板の外周及び内周部
を各々担持する環状スペーサと、前記円形基板及び環状
スペーサを互いに固着せしめる感圧性接着剤層からなる
光ディスクであって、前記感圧性接着剤層がアクリル系
接着剤からなること特徴とする。[Structure of the Invention] The optical disc of the present invention includes a pair of circular substrates, at least one of which has a signal recording layer, and an outer circumference and an inner circumference of the circular substrates so as to face each other in parallel so that the signal recording layer is on the inside. An optical disc comprising an annular spacer supported by each, and a pressure-sensitive adhesive layer for fixing the circular substrate and the annular spacer to each other, characterized in that the pressure-sensitive adhesive layer is made of an acrylic adhesive.
[発明の作用]
かかる構成の発明によればエアーサンドイッチ型光ディ
スクにおいて、一対の基板における耐ずれ応力特性が向
上する。[Operation of the Invention] According to the invention having such a configuration, in the air sandwich type optical disk, the resistance to shear stress in the pair of substrates is improved.
実施例 以下、本発明の実施例を図面を用いて説明する。Example Embodiments of the present invention will be described below with reference to the drawings.
本実施例の光ディスクは、第1図に示すものとほぼ同一
の構成を有している。信号記録層が内部空間に面して周
基板上に設けられた一対の基板5及び6間に環状接着部
材13を介して外周環状スペーサ2を挾んで光ディスク
が形成されている。The optical disc of this embodiment has almost the same configuration as that shown in FIG. An optical disc is formed by sandwiching an outer circumferential annular spacer 2 between a pair of substrates 5 and 6 provided on the circumferential substrate with the signal recording layer facing the internal space with an annular adhesive member 13 interposed therebetween.
本実施例の光ディスクが従来のものと異なる点は、第1
図に示す接着剤層13bがアクリル系感圧性接着剤から
なる点である。The optical disc of this embodiment differs from conventional ones in that the first
The adhesive layer 13b shown in the figure is made of an acrylic pressure-sensitive adhesive.
−
このアクリル系感圧性接着剤層13bを有する環状接着
部材13(アクリル系接着部材)は、例えばPCからな
るスペーサの型抜成形の際にその一方の接着剤層主面が
予め内外周スペーサの基板担持面に貼着され、他方の接
着剤層面がセパレタ(剥離紙又は保護テープ)により保
護されるように形成される。- When the annular adhesive member 13 (acrylic adhesive member) having the acrylic pressure-sensitive adhesive layer 13b is molded into a spacer made of, for example, PC, one main surface of the adhesive layer is preliminarily attached to the inner and outer peripheral spacers. The adhesive layer is attached to the substrate supporting surface, and the other adhesive layer surface is protected by a separator (release paper or protective tape).
この場合、スペーサの型抜成形の際に、厚いアクリル系
感圧性接着剤層を担持したセパレータの感圧性接着剤層
側を内外周スペーサの基板担持面に貼着する。アクリル
系接着剤層としては、記録膜を侵さないものが選ばれる
ことは云うまでもない。In this case, when punching and molding the spacer, the pressure-sensitive adhesive layer side of the separator carrying a thick acrylic pressure-sensitive adhesive layer is attached to the substrate-supporting surfaces of the inner and outer peripheral spacers. It goes without saying that the acrylic adhesive layer should be selected from one that does not corrode the recording film.
PMMA等のアクリル基板及びPC基板ををPC環状ス
ペーサによって接着することを想定して、本実施例に用
いたアクリル系接着部材と従来の光ディスクのシリコン
系接着部材との接着性能を以下に示す。Assuming that an acrylic substrate such as PMMA and a PC board are bonded using a PC annular spacer, the adhesion performance between the acrylic adhesive member used in this example and the conventional silicon adhesive member for optical discs will be shown below.
第3図に示すように、PMMA基板20に本実施例のア
クリル系接着剤層からなる接着部材13を介してPC板
片21(スペーサ)を挟んでPC基板22を接着面積1
010mmX20で接着した試料を作り、これを温度6
0℃雰囲気中におき、アクリル基板20とPC基板22
とを接着面に平行に離れるように所定荷重(100g/
cm2)を掛けてこれらのずれ距離を測定するクリープ
試験を行った。As shown in FIG. 3, a PC board 22 is bonded to a PMMA board 20 with a PC board piece 21 (spacer) interposed therebetween via an adhesive member 13 made of an acrylic adhesive layer according to the present embodiment.
A sample of 010mm x 20mm was made and heated to
The acrylic substrate 20 and the PC board 22 are placed in a 0°C atmosphere.
A predetermined load (100 g/
A creep test was conducted to measure these deviation distances by multiplying by cm2).
第4図は、このクリープ試験の場合の保持時間に対する
アクリル基板20とPC基板22とのずれ距離の変化を
しめずグラフである。FIG. 4 is a graph showing the change in the displacement distance between the acrylic substrate 20 and the PC board 22 with respect to the holding time in this creep test.
同様に、従来の光ディスクのシリコン系接着部組につい
ても第3図に示す試料を作り、上記同条件でクリープ試
験を行い、第5図のずれ距離の変化のグラフを得た。Similarly, a sample shown in FIG. 3 was prepared for a conventional silicon adhesive assembly of an optical disk, and a creep test was conducted under the same conditions as described above, to obtain a graph of changes in deviation distance as shown in FIG.
第4図および第5図から明らかなように、本実施例のア
クリル系接着部材のほうが従来の光ディスクのシリコン
系接着部組よりずれ距離が小さい。As is clear from FIGS. 4 and 5, the acrylic adhesive member of this embodiment has a smaller deviation distance than the silicon adhesive assembly of the conventional optical disc.
さらに、実施例の光ディスクと従来のものとについて環
境加速試験を行った。例えば、試験条件として70℃、
90%R,H,で500時間経過た場合でも、本実施例
のずれ距離が平均で従来のずれ距離の約1.00分の3
程度であり、本実施例の方が従来の光ディスクより少な
いずれ距離であることが判明した。Further, environmental acceleration tests were conducted on the optical disc of the example and the conventional disc. For example, the test conditions are 70℃,
Even after 500 hours have passed at 90% R, H, the deviation distance of this embodiment is about 3/1.00 of the conventional deviation distance on average.
It was found that the deviation distance of this example was smaller than that of the conventional optical disk.
また、上記実施例の光ディスクはアクリル系接着剤単層
のみからなる環状接着部材13を有したものであったが
、従来のものと同様に、環状接着部材13が、ポリエス
テルフィルム、ポリエチレンテレフタレート等からなる
基材13aと、基材の対向する両担持面に配置され且つ
アクリル系感圧性接着剤からなる第1及び第2の接着剤
層13bとから形成されていてもよい。Further, although the optical disc of the above embodiment had the annular adhesive member 13 made of only a single layer of acrylic adhesive, the annular adhesive member 13 was made of polyester film, polyethylene terephthalate, etc., as in the conventional one. The first and second adhesive layers 13b may be formed of a base material 13a, and first and second adhesive layers 13b made of an acrylic pressure-sensitive adhesive and disposed on both opposing supporting surfaces of the base material.
発明の効果
以上のように、本発明によればエアーサンドイッチ型光
ディスクの環状スペーサ及び基板の接着を環状感圧性接
着部材を介して行い、環状感圧性接着部材をアクリル系
接着剤によって構成している故に、接着剤の硬化を待つ
時間が不要となり光デイスク製造に要する時間が短縮で
きると共に、一対の基板における耐ずれ応力特性が従来
のものより優れた光ディスクを得ることができる。Effects of the Invention As described above, according to the present invention, the annular spacer and the substrate of the air sandwich type optical disk are bonded through an annular pressure-sensitive adhesive member, and the annular pressure-sensitive adhesive member is made of an acrylic adhesive. Therefore, there is no need to wait for the adhesive to harden, and the time required to manufacture the optical disc can be shortened, and it is also possible to obtain an optical disc in which the pair of substrates has better resistance to shear stress than conventional discs.
第1図は光ディスクの部分拡大断面図、第2図は光ディ
スクの組立工程説明用の部分切欠斜視図、第3図は接着
剤層からなる接着部祠によって接着された基板のずれ距
離を測定するクリープ試験用の試料の断面図、第4図は
本発明による光ディスクに関するクリープ試験の保持時
間に対するアクリル基板とPC基板とのずれ距離の変化
を示すグラフ、第5図は従来の光ディスクに関するクリ
ープ試験の保持時間に対するアクリル基板とPC基板と
のずれ距離の変化を示すグラフである。
主要部分の符号の説明
1.2・・・・・・スペーサ
5.6・・・・・・基板
13・・・・・・環状接着部材Fig. 1 is a partially enlarged sectional view of an optical disc, Fig. 2 is a partially cutaway perspective view for explaining the assembly process of the optical disc, and Fig. 3 is a measurement of the displacement distance of a substrate bonded by a bonding hole made of an adhesive layer. FIG. 4 is a cross-sectional view of a sample for a creep test. FIG. 4 is a graph showing changes in the displacement distance between the acrylic substrate and the PC board with respect to the holding time in the creep test for the optical disk according to the present invention. FIG. It is a graph showing changes in the displacement distance between the acrylic substrate and the PC board with respect to the holding time. Explanation of symbols of main parts 1.2... Spacer 5.6... Substrate 13... Annular adhesive member
Claims (4)
基板と、前記信号記録層が内側となるように平行に対向
すべく前記円形基板の外周及び内周部を各々担持する環
状スペーサと、前記円形基板及び環状スペーサを互いに
固着せしめる感圧性接着剤層からなる光ディスクであっ
て、前記感圧性接着剤層がアクリル系接着剤からなるこ
とを特徴とする光ディスク。(1) a pair of circular substrates, at least one of which has a signal recording layer; an annular spacer supporting the outer and inner circumferences of the circular substrates so as to face each other in parallel with the signal recording layer on the inside; 1. An optical disc comprising a pressure-sensitive adhesive layer that adheres a circular substrate and an annular spacer to each other, wherein the pressure-sensitive adhesive layer is comprised of an acrylic adhesive.
び第2の感圧性接着剤層とからなることを特徴とする請
求項1記載の光ディスク。(2) The optical disc according to claim 1, wherein the pressure-sensitive adhesive layer comprises a base material and first and second pressure-sensitive adhesive layers sandwiching the base material.
レートからなることを特徴とする請求項2記載の光ディ
スク。(3) The optical disc according to claim 2, wherein the base material is made of polyester or polyethyl terephthalate.
とを特徴とする請求項1ないし3のいずれか1記載の光
ディスク。(4) The optical disc according to any one of claims 1 to 3, wherein the annular spacer is made of polycarbonate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2055776A JPH03256247A (en) | 1990-03-07 | 1990-03-07 | Optical disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2055776A JPH03256247A (en) | 1990-03-07 | 1990-03-07 | Optical disk |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03256247A true JPH03256247A (en) | 1991-11-14 |
Family
ID=13008287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2055776A Pending JPH03256247A (en) | 1990-03-07 | 1990-03-07 | Optical disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03256247A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0780216A3 (en) * | 1995-12-20 | 1998-11-11 | Kabushiki Kaisha Toshiba | Information recording medium, method for manufacturing the medium, and apparatus for manufacturing the medium |
US8812449B2 (en) | 2004-04-09 | 2014-08-19 | Hitachi, Ltd. | Storage control system and method |
-
1990
- 1990-03-07 JP JP2055776A patent/JPH03256247A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0780216A3 (en) * | 1995-12-20 | 1998-11-11 | Kabushiki Kaisha Toshiba | Information recording medium, method for manufacturing the medium, and apparatus for manufacturing the medium |
US6083598A (en) * | 1995-12-20 | 2000-07-04 | Kabushiki Kaisha Toshiba | Information recording medium, method for manufacturing the medium, and apparatus for manufacturing the medium |
US8812449B2 (en) | 2004-04-09 | 2014-08-19 | Hitachi, Ltd. | Storage control system and method |
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