JPS62289945A - Optical recording element - Google Patents
Optical recording elementInfo
- Publication number
- JPS62289945A JPS62289945A JP13183586A JP13183586A JPS62289945A JP S62289945 A JPS62289945 A JP S62289945A JP 13183586 A JP13183586 A JP 13183586A JP 13183586 A JP13183586 A JP 13183586A JP S62289945 A JPS62289945 A JP S62289945A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- protective film
- optical recording
- laser light
- film
- 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 25
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 238000005260 corrosion Methods 0.000 claims abstract description 5
- 230000007797 corrosion Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 abstract description 6
- 230000010365 information processing Effects 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract description 5
- 238000004544 sputter deposition Methods 0.000 abstract description 2
- 229910006992 Si1-xCx Inorganic materials 0.000 abstract 2
- 239000010408 film Substances 0.000 description 24
- 230000000694 effects Effects 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 230000007704 transition Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
〔産業上の利用分野〕
本発明は、光ディスクに係り、特に、光記録媒体の保護
膜に関する。Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an optical disc, and particularly to a protective film for an optical recording medium.
（従来の技ｗり
近年、情報量の急激な増加に伴い、これらの情報の処理
技術として、光デイスク装置の研究開発が活発に行なわ
れている。光ディスクは、現在、主流となっている磁気
ディスクに比べ、記録密度が数十倍から数百倍と高く、
しかも高速に記録・再生・消去等の情報処理ができる。(Conventional technology) In recent years, with the rapid increase in the amount of information, research and development of optical disk devices has been actively conducted as a technology for processing this information. Compared to disks, the recording density is tens to hundreds of times higher.
Furthermore, information processing such as recording, reproducing, and erasing can be performed at high speed.
また、情報処理の際は、記録素子へ非接触的に行なうた
め、磁気ディスクで生じるヘッドクラッシュのような機
械的損傷がない。Furthermore, since information processing is performed without contacting the recording element, there is no mechanical damage such as head crashes that occur with magnetic disks.
従来の光ディスクに用いる記録素子には、記録媒体の磁
化反転を利用した光磁気記録素子と、記録媒体のアモル
ファス−結晶、結晶−結晶の相転移を利用した記録素子
がある。光磁気記録素子の記録媒体は、希土類−遷移金
属合金薄膜、相転移型記録媒体は、カルゴゲン化合物薄
膜が用いらている。これらの記録媒体は、大気、水蒸気
、レーザ熱等により酸化しゃいとと、及び、記録感度を
向上させるために保護膜を設けている。この保護膜には
耐食性及び高屈折率等の特性をもつ材料が用いられる。Recording elements used in conventional optical disks include magneto-optical recording elements that utilize magnetization reversal of a recording medium, and recording elements that utilize amorphous-crystalline and crystal-crystalline phase transitions of a recording medium. The recording medium of the magneto-optical recording element is a rare earth-transition metal alloy thin film, and the phase change type recording medium is a cargogen compound thin film. These recording media are provided with a protective film to prevent oxidation from the atmosphere, water vapor, laser heat, etc., and to improve recording sensitivity. A material having characteristics such as corrosion resistance and high refractive index is used for this protective film.
この特性をもつ保護膜を、記録媒体のレーザ光入射側に
設けることで、レーザ光が保護膜の内部で反射を繰り返
して干渉を生じる。この干渉効果が大きいほど記録媒体
へのレーザ光吸収が高められ、光磁気記録媒体のカー回
転角増幅効果が増し、また、相転移型記録媒体では、相
転移速度が早くなり、従って、記録感度が向上する。By providing a protective film with this characteristic on the laser light incident side of the recording medium, the laser light is repeatedly reflected inside the protective film, causing interference. The larger this interference effect is, the higher the absorption of laser light into the recording medium, the more the Kerr rotation angle amplification effect of the magneto-optical recording medium, and the faster the phase transition speed in phase change type recording media, which increases the recording sensitivity. will improve.
レーザの干渉効果を増大させるには屈折率が高いものほ
ど有利であり、従来は、Ｓｉｎ、５ｉｆｔｓＴｉｅｓ
、５ｉａＮａ、ＳｉＮ、ＡＵＮ、Ｓｉ等が用いられてい
る。The higher the refractive index, the more advantageous it is to increase the interference effect of the laser.
, 5iaNa, SiN, AUN, Si, etc. are used.
上記従来の保護膜は、屈折率が１．５〜２．５程度であ
り、記録感度を上げるには限界があった。The conventional protective film described above has a refractive index of about 1.5 to 2.5, and there is a limit to increasing recording sensitivity.
本発明の目的は、耐食性に優れ、従来より屈折率が高い
材料を光記録媒体の保護膜として用いることで、記録・
再生・消去等の情報処理をより高速化し、かつ、記録デ
ータの長期保存を可能とすることにある。The purpose of the present invention is to use a material that has excellent corrosion resistance and a higher refractive index than conventional materials as a protective film for optical recording media, so that recording and
The objective is to speed up information processing such as reproduction and erasure, and to enable long-term storage of recorded data.
上記目的は、光記録媒体の保護膜にアモルファスＳ １
ｔ−ｘ Ｃｘ （０＜ ｘ ＜ １ ）を用いること
により達成される。The above purpose is to use amorphous S1 in the protective film of the optical recording medium.
This is achieved by using t-xCx (0<x<1).
〔作用〕
アモ）Ｌｌフ７ス５ｉｘ−ｘＣｘ （０＜ｘ＜１）は
、耐食性に優れ、かつ、レーザ波長８３０ ｎ ｍ ｔ
’屈折率３．５ と非常に高い値を示す。アモルファス
５ｉｘ−ｘＣｘを光記録媒体の保護膜として用いること
により、レーザ光の干渉効果が増大し、記録媒体へのレ
ーザ光吸収を高められる。従って、光磁気記録媒体のカ
ー回転角増幅効果が大きくなる。[Function] Amo) Ll F7 5ix-xCx (0<x<1) has excellent corrosion resistance and a laser wavelength of 830 nm t
'It has a very high refractive index of 3.5. By using amorphous 5ix-xCx as a protective film for an optical recording medium, the interference effect of laser light is increased and the absorption of laser light into the recording medium is increased. Therefore, the effect of amplifying the Kerr rotation angle of the magneto-optical recording medium is increased.
また、相転移型記録媒体の相転移速度を速くできる。さ
らに、保護膜は非酸化物であるため、記録媒体への酸素
の混入を防ぎ、酸化による記録媒体の特性劣化を防止で
きる。Furthermore, the phase transition speed of the phase transition type recording medium can be increased. Furthermore, since the protective film is a non-oxide, it can prevent oxygen from entering the recording medium and prevent the characteristics of the recording medium from deteriorating due to oxidation.
以下、本発明の実施例を示す。 Examples of the present invention will be shown below.
図は、光記＃Ａ素子の断面図であり、透明基板４の上に
保護膜２、さらに、光記録媒体３５次いで、保護膜２、
反射膜１を順次設けた構造となっている。透明基板４は
、ガラス・ポリカーボネイト。The figure is a cross-sectional view of the optical recording device #A, in which a protective film 2 is placed on a transparent substrate 4, and an optical recording medium 35 is then covered with a protective film 2,
It has a structure in which reflective films 1 are sequentially provided. The transparent substrate 4 is made of glass polycarbonate.
アクリル等を用いる。保護膜２は、耐食性に優れ高屈折
率をもつアモルファスＳ １ｘ−ｘ Ｃｘ （０＜ ｘ
＜１）を用いる。アモルファス５ｉｉ−ｘＣｘはＳｉ
Ｃ焼結体をターゲット基材として、スパッタリング法に
より作製する。光記録媒体８は、Ｍ ｎ Ｂ １ ｅＭ
ｎＣｕＢｌ、ＧｄＣｏ、ＧｄＴｂＦｅ等の希土類−遷移
金属合金薄１１１［（光磁気記録媒体）、Ｇｅ−Ｔｏ。Use acrylic etc. The protective film 2 is made of amorphous S 1x-x Cx (0< x
<1) is used. Amorphous 5ii-xCx is Si
It is produced by a sputtering method using a C sintered body as a target base material. The optical recording medium 8 has M n B 1 eM
Rare earth-transition metal alloy thin 111 such as nCuBl, GdCo, GdTbFe, etc. (magneto-optical recording medium), Ge-To.
Ｓθ−Ｔｅ、Ａｓ−Ｔｅ−Ｇｅ系等のアモルファス力ル
ゴゲナイド薄膜、 Ｃｕ −Ａ （１−Ｎ ｉ 、 Ａ
ｇ−Ｚｎ系等の金属薄膜（相転移型光記録媒体）を用
いる。反射膜１は、ＡＱ、Ａｇ、Ｃｕ、Ｐｔ等の金属薄
膜を用いる。Amorphous rugogenide thin films such as Sθ-Te and As-Te-Ge, Cu-A (1-N i , A
A metal thin film (phase change type optical recording medium) such as g-Zn type is used. For the reflective film 1, a metal thin film such as AQ, Ag, Cu, Pt, etc. is used.
レーザ光５は、透明基板４側から入射して保護膜２の内
部で反射が繰り返されて干渉を生じ光記録媒体３に到達
する。記録媒体３は、膜厚が薄いほど記録感度を上げら
れるが、逆にレーザ光５の透過率が増えてしまい記録に
及ぼすレーザ・エネ５ルギの効率が低減してしまう。こ
のため、光記録ゴ素子のレーザ光５の入射裏面に保護膜
２と反射膜１を設け、記録媒体３を透過したレーザ光５
を反射によって再び記録媒体３に戻すことでレーザ・エ
ネルギ効率を向上させる。The laser beam 5 enters from the transparent substrate 4 side, is repeatedly reflected inside the protective film 2, causes interference, and reaches the optical recording medium 3. The thinner the film thickness of the recording medium 3 is, the higher the recording sensitivity can be, but on the contrary, the transmittance of the laser beam 5 increases and the efficiency of the laser energy 5 exerted on recording is reduced. For this reason, a protective film 2 and a reflective film 1 are provided on the back surface of the optical recording element on which the laser beam 5 is incident, so that the laser beam 5 transmitted through the recording medium 3
The laser energy efficiency is improved by returning the laser beam to the recording medium 3 by reflection.
本実施例によれば、保護膜の屈折率が非常に高いため、
レーザ光の干渉効果が増大し、記録感度を大幅に上げら
れる。また、光記録媒体が保護膜でサンドイッチされて
いるため、外気に直接触されることがなく、さらに、保
護膜は非酸化物であるため、光記録媒体の酸素混入によ
る特性劣化を防ぐことができる。According to this example, since the refractive index of the protective film is very high,
The interference effect of laser light is increased, and recording sensitivity can be greatly increased. In addition, since the optical recording medium is sandwiched between protective films, it is not exposed to the outside air directly, and since the protective film is a non-oxide material, it is possible to prevent the characteristics of the optical recording medium from deteriorating due to oxygen contamination. can.
［発明の効果］
本発明によれば、光記録媒体の保護膜にアモルファス５
ｉ１−ｘＣｘを用いることで、記録・再生・消去等の情
報処理を高速化し、かつ、記録データの長期保存が可能
となる。[Effects of the Invention] According to the present invention, amorphous 5 is added to the protective film of an optical recording medium.
By using i1-xCx, information processing such as recording, reproduction, and erasing can be speeded up, and recorded data can be stored for a long time.
【図面の簡単な説明】 図は本発明の一実施例の光記録素子の断面図である。 ２・・・保護膜。[Brief explanation of drawings] The figure is a sectional view of an optical recording element according to an embodiment of the present invention. 2...Protective film.
Claims (1)
耐食性に優れ、かつ、高屈折率のアモルファスＳｉ＿１
＿−＿ｘＣ＿ｘ（０＜ｘ＜１）を用いることを特徴とす
る光記録素子。1. In an optical recording element, as a protective film for an optical recording medium,
Amorphous Si_1 with excellent corrosion resistance and high refractive index
An optical recording element characterized by using _-_xC_x (0<x<1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13183586A JPS62289945A (en) | 1986-06-09 | 1986-06-09 | Optical recording element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13183586A JPS62289945A (en) | 1986-06-09 | 1986-06-09 | Optical recording element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62289945A true JPS62289945A (en) | 1987-12-16 |
Family
ID=15067212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13183586A Pending JPS62289945A (en) | 1986-06-09 | 1986-06-09 | Optical recording element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62289945A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01251358A (en) * | 1988-02-01 | 1989-10-06 | Minnesota Mining & Mfg Co <3M> | Photoelectro-magnetic recording medium having silicon carbide derivative |
| JPH038148A (en) * | 1989-06-05 | 1991-01-16 | Hitachi Ltd | Magneto-optical recording medium |
| US5158834A (en) * | 1988-02-01 | 1992-10-27 | Minnesota Mining And Manufacturing Company | Magneto optic recording medium with silicon carbide dielectric |
-
1986
- 1986-06-09 JP JP13183586A patent/JPS62289945A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01251358A (en) * | 1988-02-01 | 1989-10-06 | Minnesota Mining & Mfg Co <3M> | Photoelectro-magnetic recording medium having silicon carbide derivative |
| US5158834A (en) * | 1988-02-01 | 1992-10-27 | Minnesota Mining And Manufacturing Company | Magneto optic recording medium with silicon carbide dielectric |
| JPH038148A (en) * | 1989-06-05 | 1991-01-16 | Hitachi Ltd | Magneto-optical recording medium |
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