JPS60242531A - Substrate for optical information recording medium - Google Patents
Substrate for optical information recording mediumInfo
- Publication number
- JPS60242531A JPS60242531A JP59098165A JP9816584A JPS60242531A JP S60242531 A JPS60242531 A JP S60242531A JP 59098165 A JP59098165 A JP 59098165A JP 9816584 A JP9816584 A JP 9816584A JP S60242531 A JPS60242531 A JP S60242531A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- resin
- recording medium
- disk
- track guide
- 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
- 239000000758 substrate Substances 0.000 title claims abstract description 27
- 230000003287 optical effect Effects 0.000 title claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 19
- 229920005989 resin Polymers 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 13
- 239000012790 adhesive layer Substances 0.000 claims abstract description 6
- 238000001746 injection moulding Methods 0.000 claims abstract description 4
- 239000005357 flat glass Substances 0.000 claims abstract 2
- 239000010409 thin film Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光記録媒体の基板の信頼性の向上に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to improving the reliability of substrates for optical recording media.
従来、光記録媒体においては、基板材料として、ＰＭＭ
Ａなどの樹脂基板が使用されている場合が多い。高密度
の光記録全行なうためには、トラック案内溝を基板にあ
らかじめ設けておき、その上に記録薄膜を設層する必要
のある場合が多い。トラック案内溝はＰＭＭＡなどの樹
脂材料を、射出成型によって製作する方法によって設け
るのが量産性の点で優れている。Conventionally, in optical recording media, PMM is used as a substrate material.
A resin substrate such as A is often used. In order to perform high-density optical recording, it is often necessary to previously provide a track guide groove on a substrate and then deposit a recording thin film thereon. It is advantageous in terms of mass production that the track guide grooves are formed by injection molding of a resin material such as PMMA.
しかしながら、一般に樹脂基板は、温度・湿度・機械的
な力などによって変形しやすく、高密度記録媒体の基板
としては信頼性の点で不利である。However, resin substrates are generally susceptible to deformation due to temperature, humidity, mechanical force, etc., and are disadvantageous in terms of reliability as substrates for high-density recording media.
一方、ガラス基板は、前記の信頼性の点で優れているが
、ガラス基板に直接トラック案内溝全般ける方法の中で
、量産性の点で優れた方法がない。また、ガラスは、一
般に、樹脂材料よりも、熱伝導性が高く、記録薄膜が光
を吸収し、その熱による記録を行なう方式では、記録感
度が低くなる。On the other hand, glass substrates are excellent in terms of reliability as described above, but among the methods of directly forming track guide grooves on glass substrates, there is no method that is excellent in terms of mass production. Further, glass generally has higher thermal conductivity than resin materials, and in a system in which a recording thin film absorbs light and performs recording using the heat, the recording sensitivity becomes low.
そこで、トラック案内溝全転写するための原盤に、ニト
ロセルロースなどの樹脂を塗布し、この上にガラス基板
を接着した後に原盤を離すことにより、ガラス基板上に
トラック案内溝のある樹脂層を設げる方法が採られてい
る場合がある。しかしながら、この方法によると、樹脂
の塗布・乾燥工程で時間がかかり、生産性の上で不利で
ある。Therefore, by applying a resin such as nitrocellulose to the master disk for fully transferring the track guide grooves, and then separating the master disk after adhering a glass substrate on top of this, a resin layer with track guide grooves can be created on the glass substrate. In some cases, a method is used to However, according to this method, the resin coating and drying steps take time, which is disadvantageous in terms of productivity.
本発明の特徴は、量産性の上で有利な射出成型法によっ
て、あらかじめ、トラック案内溝つきの樹脂基板を作り
、当樹脂基板と、ガラス基板と全接着層全弁してはり合
わせることにより、機械的強度が高（信頼性の高い光記
録媒体用の基板を提供することにある。A feature of the present invention is that a resin substrate with track guide grooves is made in advance by injection molding, which is advantageous in terms of mass production, and then this resin substrate and a glass substrate are bonded together with all adhesive layers. The objective is to provide a substrate for optical recording media with high physical strength (high reliability).
トラック案内溝つきの樹脂基板の厚さは、α５１１ｎ〜
１ＴＫＩｎ１ガラス基板の厚さは、ａ５ｆｉ〜１−接着
層の厚さは、α２覇以下とし、全体としてはり合わせた
基板の厚さは、１．２簡〜２電であることが望ましい。The thickness of the resin board with track guide grooves is α511n~
It is preferable that the thickness of the 1TKIn1 glass substrate is a5fi to 1, the thickness of the adhesive layer is not more than α2, and the thickness of the bonded substrate as a whole is 1.2 to 2.
また、基板全通して記録光を入射する場合には、樹脂・
ガラス・接着層は記録光に対して透明であり、透過率と
して９０％以上なければならない。さらに、樹脂基板と
ガラス基板の熱膨張率が一致するような材料全還ばな（
てはならない。このような目的全達成するためには、樹
脂材料として、ＰＭＭＡｔたはポリカーボネート、ガラ
ス材料としては、ガラスセラミックスと呼ばれる強化ガ
ラス材料を選び、熱膨張率を使用する樹脂基板の熱膨張
率に一致するように設計することで可能となる。In addition, when recording light is incident through the entire board, it is necessary to
The glass/adhesive layer must be transparent to the recording light and have a transmittance of 90% or more. Furthermore, it is necessary to completely recycle the materials so that the thermal expansion coefficients of the resin substrate and the glass substrate match (
must not. In order to achieve all of these objectives, PMMAt or polycarbonate is selected as the resin material, and a reinforced glass material called glass ceramics is selected as the glass material, and the thermal expansion coefficient matches that of the resin substrate used. This is possible by designing it like this.
本発明によれば量産性がアリ、かつ信頼性の高い光記録
媒体用の基板を提供することができる。According to the present invention, it is possible to provide a substrate for an optical recording medium that is easy to mass-produce and has high reliability.
第１図において、第１図は記録膜をつけた本発明の基板
の部分断面図である。In FIG. 1, FIG. 1 is a partial cross-sectional view of a substrate of the present invention provided with a recording film.
Claims (1)
的に情報全記録する光記録媒体において、射出成型によ
ってあらかじめ作られた、光学的トラック案内溝全片方
の面に有する樹脂円盤と、両面が平担なガラス円盤とを
、該樹脂円盤の平担な面とガラス円盤との間に接着層を
介してはり合わせた構成により、機械的強度を高めたこ
とを特徴とする光記録媒体の基板。In an optical recording medium in which all information is recorded optically on a thin film using a high-density, high-energy light beam, a resin disk with optical track guide grooves on one side, which is made in advance by injection molding, and a resin disk on both sides. An optical recording medium characterized in that the mechanical strength is increased by a structure in which a flat glass disk is bonded to the flat surface of the resin disk with an adhesive layer interposed between the flat surface of the resin disk and the glass disk. substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59098165A JPS60242531A (en) | 1984-05-16 | 1984-05-16 | Substrate for optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59098165A JPS60242531A (en) | 1984-05-16 | 1984-05-16 | Substrate for optical information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60242531A true JPS60242531A (en) | 1985-12-02 |
Family
ID=14212469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59098165A Pending JPS60242531A (en) | 1984-05-16 | 1984-05-16 | Substrate for optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60242531A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02166641A (en) * | 1988-12-20 | 1990-06-27 | Toppan Printing Co Ltd | Optical recording medium |
-
1984
- 1984-05-16 JP JP59098165A patent/JPS60242531A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02166641A (en) * | 1988-12-20 | 1990-06-27 | Toppan Printing Co Ltd | Optical recording medium |
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