JPH04315833A - Optical disk - Google Patents
Optical diskInfo
- Publication number
- JPH04315833A JPH04315833A JP3082349A JP8234991A JPH04315833A JP H04315833 A JPH04315833 A JP H04315833A JP 3082349 A JP3082349 A JP 3082349A JP 8234991 A JP8234991 A JP 8234991A JP H04315833 A JPH04315833 A JP H04315833A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- substrate
- antistatic film
- surface resistance
- optical disk
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000000428 dust Substances 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 3
- 238000004528 spin coating Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、基板上に帯電防止膜を
備える光ディスクに関する。近年、大容量の文書データ
や画像情報を記憶させる情報記憶媒体として光ディスク
が脚光を浴びている。光ディスクは１μｍ程度に絞られ
た光ビームによって記憶されるため、大容量の情報が記
憶できる。しかし、光ディスクの基板材料はポリカーボ
ネート，アクリル，ガラス等の絶縁性部材が利用される
ため、光ディスクの表面は帯電性を有している。従って
多量の塵埃が付着すると、情報の記録・再生が不可能と
なる。このために基板上には表面抵抗の小さい帯電防止
膜を形成することが要望されている。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk provided with an antistatic film on a substrate. In recent years, optical discs have been in the spotlight as information storage media for storing large amounts of document data and image information. Optical disks can store large amounts of information because they are stored using a light beam focused to about 1 μm. However, since the substrate material of the optical disk is an insulating material such as polycarbonate, acrylic, glass, etc., the surface of the optical disk has a charging property. Therefore, if a large amount of dust adheres, it becomes impossible to record and reproduce information. For this reason, it is desired to form an antistatic film with low surface resistance on the substrate.
【０００２】0002
【従来の技術】図３は従来の光ディスクの形状図であっ
て図３（ａ）は要部平面図を示し、図３（ｂ）は要部断
面図を示す。この光ディスクは貼り合わせによって両面
使用を可能にした光ディスクの一例を示したものである
。両図において、１は透明かつ絶縁性部材からなる円板
状の基板、２は基板１の片面にそれぞれ成膜された記録
膜、３は基板１の表面にそれぞれ形成された帯電防止膜
、４は貼り合わせ用の接着剤、５は円板状の基板１の中
心孔、６は図示しないドライブ用のスピンドルハブと中
心を一致させて嵌合する着脱自在のハブであって、基板
１の中心孔５に固着されている。ここでハブ６を含む光
ディスクを総称して光ディスク７と呼称することにする
。2. Description of the Related Art FIG. 3 is a diagram showing the shape of a conventional optical disc, with FIG. 3(a) showing a plan view of the main part, and FIG. 3(b) showing a sectional view of the main part. This optical disc is an example of an optical disc that can be used on both sides by pasting them together. In both figures, 1 is a disk-shaped substrate made of a transparent and insulating material, 2 is a recording film formed on one side of the substrate 1, 3 is an antistatic film formed on each surface of the substrate 1, and 4 is a disk-shaped substrate made of a transparent and insulating material. 5 is a center hole of the disc-shaped substrate 1; 6 is a removable hub that is fitted with the center of the drive spindle hub (not shown); It is fixed in the hole 5. Here, the optical disc including the hub 6 will be collectively referred to as an optical disc 7.
【０００３】基板１の表面は一般に傷が付き易い所謂擦
傷性の部材で構成されている。基板１は射出成形等の手
段によって信号記録のためのグルーブ（案内溝）やアド
レス情報及びディスクの特性を示すためのピットが形成
されるが、その際に保持器具によって中心孔５の外周付
近にリング状の微小突起が発生する。８はこの微小突起
を示している。[0003] The surface of the substrate 1 is generally made of a so-called abrasive material that is easily scratched. Grooves (guide grooves) for recording signals and pits for indicating address information and disk characteristics are formed on the substrate 1 by means such as injection molding. Ring-shaped microprotrusions are generated. 8 indicates this microprotrusion.
【０００４】ところで、基板１の表面に帯電防止膜を形
成する手段として一般にスピンコート法が用いられる。
しかしながら、上述のようにリング状の微小突起８が存
在する領域は、スピンコート法ではムラが発生してきれ
いな膜を得ることができないために、微小突起８が多数
存在する領域を避けて実施している。Incidentally, a spin coating method is generally used as a means for forming an antistatic film on the surface of the substrate 1. However, as mentioned above, in areas where ring-shaped microprotrusions 8 exist, spin coating causes unevenness and makes it impossible to obtain a clean film. ing.
【０００５】[0005]
【発明が解決しようとする課題】従って、従来の光ディ
スク７はリング状の微小突起８が存在する領域、即ち、
ハブ６の外周から帯電防止膜の内径までの領域は基板１
が露出しており、この露出部分は絶縁性部材であるため
帯電性を有する。従って、この露出部分に多量の塵埃が
付着し、情報の記録・再生が不可能になる場合が発生す
るといった問題があった。[Problems to be Solved by the Invention] Therefore, in the conventional optical disc 7, the area where the ring-shaped microprotrusions 8 exist, that is,
The area from the outer circumference of the hub 6 to the inner diameter of the antistatic film is the substrate 1.
is exposed, and since this exposed portion is an insulating member, it has a charging property. Therefore, there is a problem in that a large amount of dust adheres to this exposed portion, making it impossible to record or reproduce information.
【０００６】本発明は上記従来の欠点に鑑みなされたも
ので、表面抵抗の大きな基板露出部分をなくするための
手段を提供することを目的とする。The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide a means for eliminating exposed portions of a substrate having a high surface resistance.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に本発明は図１に示すように、表面抵抗の大なる円板状
の基板１の中心にハブ６を固着し、該ハブ６の外周と同
心円状にドーナツ形の帯電防止膜３を備えた光ディスク
７において、前記ハブ６の外周と前記帯電防止膜３の内
周の間に露出する前記基板１の表面領域に、前記帯電防
止膜３と同等以下の表面抵抗を有するラベル９を貼設し
て構成する。[Means for Solving the Problems] In order to achieve the above object, the present invention, as shown in FIG. In an optical disk 7 having a donut-shaped antistatic film 3 concentrically with the outer periphery, the antistatic film is provided on the surface area of the substrate 1 exposed between the outer periphery of the hub 6 and the inner periphery of the antistatic film 3. A label 9 having a surface resistance equal to or lower than that of 3 is attached.
【０００８】[0008]
【作用】ハブ６の外周と帯電防止膜３の内周の間に露出
する基板１の表面領域を、帯電防止膜３と同等以下の表
面抵抗を有するラベル９にて被覆することにより基板１
の表面全体を帯電防止効果のある表面抵抗値に保持し、
塵埃の付着を全面的に防止することができるから、情報
の記録・再生が確実に行えるようになる効果がある。[Operation] By covering the surface area of the substrate 1 exposed between the outer periphery of the hub 6 and the inner periphery of the antistatic film 3 with a label 9 having a surface resistance equal to or lower than that of the antistatic film 3, the substrate 1
maintains the entire surface at a surface resistance value with antistatic effect,
Since the adhesion of dust can be completely prevented, information can be recorded and reproduced reliably.
【０００９】[0009]
【実施例】以下本発明の実施例を図面によって詳述する
。なお、構成，動作の説明を理解し易くするために全図
を通じて同一部分には同一符号を付してその重複説明を
省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings. In order to make the explanation of the configuration and operation easier to understand, the same parts are denoted by the same reference numerals throughout the drawings, and their repeated explanation will be omitted.
【００１０】図１は本発明の一実施例を示す形状図であ
って、図１（ａ）は要部平面図、図１（ｂ）は要部断面
図を示す。両図において、９は帯電防止膜３と同等以下
の表面抵抗を有するラベルであって、ハブ６の外周と帯
電防止膜３の内周の間に露出する基板１の表面領域を貼
設により被覆している。その形状は前記表面領域を被覆
するためにドーナツ形状に切り抜かれたものであるが、
図示するようにその外周部分は若干量だけ帯電防止膜３
の内周部分に重なり合うことが好ましい。FIG. 1 is a shape diagram showing an embodiment of the present invention, in which FIG. 1(a) is a plan view of the main part, and FIG. 1(b) is a sectional view of the main part. In both figures, 9 is a label having a surface resistance equal to or lower than that of the antistatic film 3, and is applied to cover the surface area of the substrate 1 exposed between the outer periphery of the hub 6 and the inner periphery of the antistatic film 3. are doing. Its shape is a donut-shaped cutout to cover the surface area,
As shown in the figure, the outer periphery is covered with a small amount of antistatic film 3.
It is preferable that the inner periphery of the
【００１１】また、このラベル９の貼設は基板１に帯電
防止膜３を形成後にハブ６を取り付け、しかる後に貼設
することが好ましい。これは基板１に対するハブ６の傾
きを防止するためである。Further, it is preferable that the label 9 is attached after forming the antistatic film 3 on the substrate 1, attaching the hub 6, and then attaching the label 9. This is to prevent the hub 6 from tilting with respect to the substrate 1.
【００１２】また、帯電防止膜３は耐擦傷性を有する部
材、例えば広栄化学社製で光硬化型樹脂からなる商品名
（コーエイハードＤＡＳ−１０２）等が好ましいことは
言うまでもない。It goes without saying that the antistatic film 3 is preferably a material having abrasion resistance, such as Koei Hard DAS-102, a product made by Koei Kagaku Co., Ltd. and made of a photocurable resin.
【００１３】効果を確認するために次に述べるような試
作光ディスクを作製した。即ち、ポリカーボネート基板
のヘッド案内溝（図示せず）面に記録膜２としてＴｂＦ
ｅＣｏからなる光磁気記録膜をスパッタにより成膜した
後、これと同じものを記録膜２を対向させて接着剤４で
貼り合わせた。次にこの光ディスクの表面に表面抵抗が
１０１１Ωの帯電防止膜３（紫外線硬化タイプの前記コ
ーエイハードＤＡＳー１０２）をスピンコート法によっ
て従来どおり微小突起８より外側に形成した。[0013] In order to confirm the effect, a prototype optical disc as described below was manufactured. That is, TbF was deposited as the recording film 2 on the head guide groove (not shown) surface of the polycarbonate substrate.
After forming a magneto-optical recording film made of eCo by sputtering, the same film was bonded together with an adhesive 4 with the recording film 2 facing each other. Next, on the surface of this optical disk, an antistatic film 3 (Koei Hard DAS-102 of the ultraviolet curing type) having a surface resistance of 10 11 Ω was formed on the outside of the microprotrusions 8 by spin coating as in the conventional method.
【００１４】帯電防止膜３を形成した後、ハブ６の外周
と前記帯電防止膜３の内周の間に露出する前記基板１の
表面領域に、前記帯電防止膜３と同等以下の表面抵抗を
有するラベル９としてドーナツ状に切り抜いたアルミ箔
を貼設した。アルミ箔の表面抵抗は１０１１Ωに比較し
て遙かに小さな値であった。After forming the antistatic film 3, the surface area of the substrate 1 exposed between the outer periphery of the hub 6 and the inner periphery of the antistatic film 3 is provided with a surface resistance equal to or lower than that of the antistatic film 3. An aluminum foil cut out into a donut shape was pasted as a label 9. The surface resistance of the aluminum foil was much smaller than 1011Ω.
【００１５】上記の本発明の試作光ディスク（ラベルあ
り）と、従来の光ディスク（ラベルなし）について塵埃
の付着度を実験的に調査するために、砂塵を浮遊させた
環境下にそれぞれの光ディスクを３０分間放置した後、
反射率の変化で調べた。In order to experimentally investigate the degree of dust adhesion on the above-mentioned prototype optical disk of the present invention (with a label) and a conventional optical disk (without a label), each optical disk was placed in an environment with suspended dust for 30 minutes. After leaving it for a minute,
It was investigated by changes in reflectance.
【００１６】図２は光ディスクの反射率変化を示す特性
図であって、横軸には光ディスクの記録領域の半径を（
ｉｎｎｅｒ ｃｅｎｔｅｒ ｏｕｔｅｒ）の位置変化で
示し、縦軸には光ディスクの反射率の変化量を減少方向
に％で示し、特性曲線Ａは本発明の試作光ディスク（ラ
ベルあり）、特性曲線Ｂは従来の光ディスク（ラベルな
し）を示したものである。比較して分かるように本発明
の試作光ディスクの反射率変化は半径方向に殆ど変化し
ないが、従来の光ディスクは半径がｉｎｎｅｒ に近づ
くほど反射率が低下している。これは光ディスク面に付
着した塵埃の影響によるものであることは明らかである
。FIG. 2 is a characteristic diagram showing changes in reflectance of an optical disc, and the horizontal axis represents the radius of the recording area of the optical disc (
The vertical axis shows the amount of change in the reflectance of the optical disc in the decreasing direction in %. Characteristic curve A is the prototype optical disc of the present invention (with a label), and characteristic curve B is the conventional optical disc. (no label). As can be seen from the comparison, the reflectance of the prototype optical disk of the present invention hardly changes in the radial direction, whereas the reflectance of the conventional optical disk decreases as the radius approaches the inner side. It is clear that this is due to the influence of dust attached to the optical disc surface.
【００１７】[0017]
【発明の効果】本発明によれば、光ディスク内周部に多
量の塵埃が付着することはなくなり、情報の記録や再生
が確実に行える効果がある。According to the present invention, it is possible to prevent a large amount of dust from adhering to the inner periphery of an optical disc, and to ensure that information can be recorded and reproduced.
【図１】 本発明の一実施例を示す光ディスクの形状
図である。FIG. 1 is a shape diagram of an optical disc showing an embodiment of the present invention.
【図２】 光ディスクの反射率変化を示す特性図であ
る。FIG. 2 is a characteristic diagram showing changes in reflectance of an optical disc.
【図３】 従来の光ディスクの形状図である。FIG. 3 is a diagram showing the shape of a conventional optical disc.
１ 基板 ３ 帯電防止膜 ６ ハブ ９ ラベル 1 Board 3. Antistatic film 6 Hub 9 Label
Claims (1)
の中心にハブ（６）を固着し、該ハブ（６）の外周と同
心円状にドーナツ形の帯電防止膜（３）を備えた光ディ
スク（７）において、前記ハブ（６）の外周と前記帯電
防止膜（３）の内周の間に露出する前記基板（１）の表
面領域に、前記帯電防止膜（３）と同等以下の表面抵抗
を有するラベル（９）を貼設したことを特徴とする光デ
ィスク。[Claim 1] Disc-shaped substrate (1) with high surface resistance
In an optical disk (7), a hub (6) is fixed to the center of the hub (6), and a doughnut-shaped antistatic film (3) is provided concentrically with the outer circumference of the hub (6), the outer circumference of the hub (6) and the electrostatic charge A label (9) having a surface resistance equal to or lower than that of the antistatic film (3) is attached to the surface area of the substrate (1) exposed between the inner peripheries of the antistatic film (3). optical disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3082349A JP2789837B2 (en) | 1991-04-15 | 1991-04-15 | optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3082349A JP2789837B2 (en) | 1991-04-15 | 1991-04-15 | optical disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04315833A true JPH04315833A (en) | 1992-11-06 |
| JP2789837B2 JP2789837B2 (en) | 1998-08-27 |
Family
ID=13772092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3082349A Expired - Fee Related JP2789837B2 (en) | 1991-04-15 | 1991-04-15 | optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2789837B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0843306A1 (en) * | 1996-06-03 | 1998-05-20 | Kao Corporation | Optical disc, process for producing the optical disc and its manufacturing apparatus |
-
1991
- 1991-04-15 JP JP3082349A patent/JP2789837B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0843306A1 (en) * | 1996-06-03 | 1998-05-20 | Kao Corporation | Optical disc, process for producing the optical disc and its manufacturing apparatus |
| EP0843306A4 (en) * | 1996-06-03 | 2001-01-10 | Kao Corp | Optical disc, process for producing the optical disc and its manufacturing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2789837B2 (en) | 1998-08-27 |
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