JPH02189776A - Optical disk and its manufacture - Google Patents
Optical disk and its manufactureInfo
- Publication number
- JPH02189776A JPH02189776A JP1010629A JP1062989A JPH02189776A JP H02189776 A JPH02189776 A JP H02189776A JP 1010629 A JP1010629 A JP 1010629A JP 1062989 A JP1062989 A JP 1062989A JP H02189776 A JPH02189776 A JP H02189776A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- hub
- optical disk
- melting point
- magneto
- 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 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 5
- 238000005304 joining Methods 0.000 claims description 3
- 229920005989 resin Polymers 0.000 abstract description 10
- 239000011347 resin Substances 0.000 abstract description 10
- 238000003466 welding Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 125000002346 iodo group Chemical group I* 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はマグネットクランプ方式により回転駆動する光
ディスク並びにその製法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disk that is rotationally driven by a magnetic clamp method and a method for manufacturing the same.
光ディスクはマグネットクランプ方式により回転駆動し
、そのためにハブをプラスチック基板上に取付ける必要
がある。Optical discs are rotationally driven using a magnetic clamp system, which requires a hub to be mounted on a plastic substrate.
その取付は方法には接着剤を用いたり１．あるいは超音
波や高周波によりハブ及び基板のそれぞれの一部を溶融
し、両者を溶着する方法が提案されている。The installation method is to use adhesive or 1. Alternatively, a method has been proposed in which a portion of the hub and the substrate are melted using ultrasonic waves or high frequency waves, and the two are welded together.
前者の方法はコスト面及び作業性の点で十分でなく、ま
た、接着剤の硬化収縮により接合部に歪みが生じ、その
ためにＣ／Ｎなどの特性が劣化するという問題点がある
。The former method is not sufficient in terms of cost and workability, and also has the problem that distortion occurs in the joint due to curing and shrinkage of the adhesive, resulting in deterioration of characteristics such as C/N.
また、後者の方法はコスト面及び作業性の点で優れてい
るが、・基板の一部が溶融し、その溶融部が冷却固化す
るに伴い、内部歪みが生じ、これにより、ディスク内周
部のＣ／Ｎなどの電気的特性が劣化するという問題点が
あった。In addition, although the latter method is superior in terms of cost and workability, - a part of the substrate melts, and as the melted part cools and solidifies, internal distortion occurs, which causes damage to the inner periphery of the disk. There was a problem in that the electrical characteristics such as C/N of the device deteriorated.
したがって、本発明は畝上に鑑みて案出されたものであ
り、その目的は基板内部に歪みが生じなくなってＣ／Ｎ
などの電気的特性が向上した光ディスクを提供すること
にある。Therefore, the present invention was devised in view of the ridges, and its purpose is to prevent distortion from occurring inside the substrate and to improve the C/N.
An object of the present invention is to provide an optical disc with improved electrical characteristics such as the following.
また、本発明の他の目的は上記のような高特性の光ディ
スクの製法を提供することにある。Another object of the present invention is to provide a method for manufacturing an optical disc with high characteristics as described above.
本発明の光ディスクは、プラスチック基板、該基板上に
形成した磁性体層並びにマグネットクランプ方式により
基板を回転駆動させるため上記基板上に接着したハブか
ら成り、そのハブの基板接合部材が基板に比べて低融点
の熱可塑性樹脂から成ることを特徴とする。The optical disk of the present invention comprises a plastic substrate, a magnetic layer formed on the substrate, and a hub adhered to the substrate for rotationally driving the substrate using a magnetic clamp method, and the substrate bonding member of the hub is larger than that of the substrate. It is characterized by being made of a thermoplastic resin with a low melting point.
また、本発明に係る光ディスクの製法は、プラスチック
基板上に磁性体層を形成し、この基板に比べて低融点の
熱可塑性樹脂から成る基板接合部材を備えたハブを基板
の非成膜面上に配置し、次いで超音波もしくは高周波に
より基板接合部材を溶融するとともに基板を実質上溶融
しないでハブを基板上に溶着させることを特徴とする。In addition, the method for manufacturing an optical disk according to the present invention includes forming a magnetic layer on a plastic substrate, and attaching a hub equipped with a substrate bonding member made of a thermoplastic resin having a lower melting point than the substrate on the non-film-formed surface of the substrate. The hub is then placed on the substrate, and then the substrate joining member is melted by ultrasonic waves or high frequency waves, and the hub is welded onto the substrate without substantially melting the substrate.
上記製法によれば、ハブの接合部が優先的に溶融し、そ
のために溶着前後において基板内部に歪みが生じなくな
り、複屈折が変化せず、その結果、Ｃ／Ｎなどの電気的
特性が劣化しない優れた光ディスクとなる。According to the above manufacturing method, the joint part of the hub is preferentially melted, so no distortion occurs inside the substrate before and after welding, birefringence does not change, and as a result, electrical properties such as C/N deteriorate. This makes it an excellent optical disc.
本発明は、マグネットクランプ方式により基板を回転駆
動させるために基板上にハブを接着させる光ディスクで
あれば、種々の光ディスクに適用することができるが、
本実施例においては、希土類−遷移金属の非晶質磁性合
金から成る垂直磁化膜を用いた光磁気ディスクを例にと
って説明する。The present invention can be applied to various optical discs as long as a hub is adhered to a substrate in order to drive the substrate rotationally using a magnetic clamp method.
In this embodiment, a magneto-optical disk using a perpendicularly magnetized film made of an amorphous magnetic alloy of rare earth-transition metals will be explained.
第１図はハブ１が光磁気ディスク２に接着した状態を示
し、第２図はその断面図である。FIG. 1 shows the hub 1 adhered to the magneto-optical disk 2, and FIG. 2 is a sectional view thereof.
ハブｌは樹脂製リング部３と金属板４がら成り、リング
部３が光磁気ディスク２の内側円周面上に溶着される。The hub 1 consists of a resin ring part 3 and a metal plate 4, and the ring part 3 is welded onto the inner circumferential surface of the magneto-optical disk 2.
光磁気ディスク２は次のように製作する。The magneto-optical disk 2 is manufactured as follows.
交流三源マグネトロンスパッタリング装置を用いてポリ
カーボネート製ディスク基板（φ１３０ｍｍ ）に誘電
体層（窒化シリコンを主要成分とし、これにＹ原子、Ａ
Ｉ原子及び０原子が含まれた層であり、これは所謂、Ｙ
ＳｉＡＩＯＮ Ｊｉ・・・イツトリウムサイアロン層と
呼ばれる層である）を７２５人の厚みで形成し、この層
の上にＧｄＤｙＦｅ垂直磁化膜を６００人の厚みで形成
し、そして、同装置内で続けて酸化チタン層（チタン原
子に対する酸素原子比率が０．０５〜０．９０の範囲内
に設定されている）を１．０００人の厚みで形成して光
磁気記録部材をつくった。A dielectric layer (mainly made of silicon nitride, with Y atoms and A
This layer contains I atoms and 0 atoms, and this is the so-called Y
SiAION Ji (a layer called yttrium sialon layer) is formed to a thickness of 725 layers, and a GdDyFe perpendicular magnetization film is formed on this layer to a thickness of 600 layers, and then continuously in the same equipment. A magneto-optical recording member was produced by forming a titanium oxide layer (the ratio of oxygen atoms to titanium atoms was set within the range of 0.05 to 0.90) to a thickness of 1.000 mm.
この光磁気記録部材を２個用意し、一方の部材の酸化チ
タン層の上にホットメルト接着剤を塗布し、直ちに他方
の光磁気記録部材の酸化チタン層と貼り合わせ、光磁気
ディスク２を作製した。尚、第２図中、５は上記光磁気
記録部材、６はポットメルト接着剤を表わす。Two of these magneto-optical recording members are prepared, a hot melt adhesive is applied onto the titanium oxide layer of one member, and the titanium oxide layer of the other member is immediately bonded to the magneto-optical recording member to produce the magneto-optical disk 2. did. In FIG. 2, numeral 5 represents the magneto-optical recording member, and numeral 6 represents the pot-melt adhesive.
本発明者等は、上記のようなハブ１を備えた光ディスク
を製作するに当たって、樹脂製リング部３の材質を第１
表に示すような樹脂とし、これにより、４種類のハブを
それぞれ超音波溶着により取り付け、４種類の光磁気デ
ィスクを作製した。In manufacturing an optical disc equipped with the hub 1 as described above, the inventors of the present invention selected the material of the resin ring portion 3 as the first material.
Using the resin shown in the table, four types of hubs were attached by ultrasonic welding to produce four types of magneto-optical disks.
尚、同表中の融点はハブ用樹脂の融点である。Note that the melting point in the same table is the melting point of the hub resin.
この超音波溶着については、光磁気ディスクのグループ
の中心と、ハブの中心とをＸ−Ｙテーブルにより正確に
位置合わせを行い、ハブを光磁気ディスクの上に配置す
る。次いで、ハブに超音波振動子を接触させ、超音波を
かけると、その振動子よりハブに振動が伝わり、ハブの
接合部と光磁気ディスクの基板面との間に摩擦が発生し
、その部分の温度が上昇する。この温度上昇により低融
点の部材が優先的に溶融し、然る後、超音波の付加を止
めるに伴い、その溶融部分が冷却し固化すると超音波溶
着が完了する。For this ultrasonic welding, the center of the group of magneto-optical disks and the center of the hub are accurately aligned using an X-Y table, and the hub is placed above the magneto-optical disk. Next, when an ultrasonic vibrator is brought into contact with the hub and ultrasonic waves are applied, vibrations are transmitted from the vibrator to the hub, causing friction between the joint of the hub and the substrate surface of the magneto-optical disk, causing damage to that part. temperature increases. Due to this temperature rise, the low melting point members are preferentially melted, and then, as the application of ultrasonic waves is stopped, the melted portions cool and solidify, completing the ultrasonic welding.
第１
表
かくして得られた４種類の光磁気ディスクについて、ハ
ブの取付前及び取付後における半径ｒが３０ｍｍである
部位のＣ／Ｎ変化量、即ち、△Ｃ／Ｎを測定したところ
、第１表に示す通りの結果が得られた。Table 1 Regarding the four types of magneto-optical disks thus obtained, we measured the amount of C/N change, that is, △C/N, at a portion with a radius r of 30 mm before and after the hub was attached. The results shown in the table were obtained.
この結果より明らかな通り、本発明の光磁気ディスクＣ
，ＤはＣ／Ｎの劣化がほとんど認められないが、ポリカ
ーボネート製ディスク基板と同一樹脂、あるいはそれよ
りも高い融点の樹脂を用いた光磁気ディスクＡ、Ｂにつ
いてはＣ／Ｎが顕著に劣化している。As is clear from this result, the magneto-optical disk C of the present invention
, D showed almost no deterioration in C/N, but magneto-optical disks A and B, which were made of the same resin as the polycarbonate disk substrate or a resin with a higher melting point, showed a marked deterioration in C/N. ing.
本発明者等は、上記実施例以外に基板と同−樹脂温から
成るハブを用いても、両者の間の平均分子量などを変え
、これによってハブ用樹脂の融点が基板のものに比べて
低くなった場合、上記実施例と同様にＣ／Ｎの劣化が生
じないと考える。In addition to the above-mentioned embodiments, the inventors of the present invention also used a hub made of the same resin temperature as the substrate, but by changing the average molecular weight between the two, the melting point of the hub resin was lower than that of the substrate. In this case, it is considered that no deterioration of C/N occurs as in the above embodiment.
以上の通り、本発明の光ディスクは、マグネットクラン
プ方式により基板を回転駆動するに当たって、ハブの基
板接合部材を選択し、そして、超音波もしくは高周波に
よる溶着法により接着した場合、基板内部に歪みが生じ
なくなってＣ／Ｎなどの電気的特性を向上させることが
できた。As described above, in the optical disk of the present invention, when the substrate is rotationally driven by the magnetic clamp method, when the substrate joining member of the hub is selected and bonded by ultrasonic or high frequency welding method, distortion occurs inside the substrate. As a result, electrical characteristics such as C/N can be improved.
第１図はハブを備えた光ディスクの斜視図であり、第２
図はその光ディスクの断面図である。FIG. 1 is a perspective view of an optical disc equipped with a hub;
The figure is a cross-sectional view of the optical disc.
Claims (2)
並びにマグネットクランプ方式により基板を回転駆動さ
せるため上記基板上に接着したハブから成る光ディスク
において、前記ハブの基板接合部材が前記基板に比べて
低融点の熱可塑性樹脂から成ることを特徴とする光ディ
スク。(1) In an optical disk consisting of a plastic substrate, a magnetic layer formed on the substrate, and a hub adhered to the substrate for rotationally driving the substrate using a magnetic clamp method, the substrate bonding member of the hub is larger than the substrate. An optical disc characterized by being made of a low melting point thermoplastic resin.
板に比べて低融点の熱可塑性樹脂から成る基板接合部材
を備えたハブを基板の非成膜面上に配置し、次いで超音
波もしくは高周波により基板接合部材を溶融するととも
に基板を実質上溶融しないでハブを基板上に溶着させる
ことを特徴とする光ディスクの製法。(2) A magnetic layer is formed on a plastic substrate, a hub equipped with a substrate bonding member made of a thermoplastic resin with a lower melting point than the substrate is placed on the non-film-forming surface of the substrate, and then ultrasonic waves or A method for manufacturing an optical disc, characterized in that a substrate joining member is melted by high frequency and a hub is welded onto a substrate without substantially melting the substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1010629A JPH02189776A (en) | 1989-01-18 | 1989-01-18 | Optical disk and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1010629A JPH02189776A (en) | 1989-01-18 | 1989-01-18 | Optical disk and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02189776A true JPH02189776A (en) | 1990-07-25 |
Family
ID=11755512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1010629A Pending JPH02189776A (en) | 1989-01-18 | 1989-01-18 | Optical disk and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02189776A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62192945A (en) * | 1986-02-20 | 1987-08-24 | Sony Corp | Information disk |
| JPS63209083A (en) * | 1987-02-26 | 1988-08-30 | Sony Corp | Manufacturing of disk cartridge |
-
1989
- 1989-01-18 JP JP1010629A patent/JPH02189776A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62192945A (en) * | 1986-02-20 | 1987-08-24 | Sony Corp | Information disk |
| JPS63209083A (en) * | 1987-02-26 | 1988-08-30 | Sony Corp | Manufacturing of disk cartridge |
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