JPS58203644A - Light recording system - Google Patents

Light recording system

Info

Publication number
JPS58203644A
JPS58203644A JP57085962A JP8596282A JPS58203644A JP S58203644 A JPS58203644 A JP S58203644A JP 57085962 A JP57085962 A JP 57085962A JP 8596282 A JP8596282 A JP 8596282A JP S58203644 A JPS58203644 A JP S58203644A
Authority
JP
Japan
Prior art keywords
light
writing
layer
film
absorbing
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
Application number
JP57085962A
Other languages
Japanese (ja)
Inventor
Sotaro Edokoro
絵所　壮太郎
Masaki Ito
雅樹 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP57085962A priority Critical patent/JPS58203644A/en
Publication of JPS58203644A publication Critical patent/JPS58203644A/en
Pending legal-status Critical Current

Links

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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00453—Recording involving spectral or photochemical hole burning
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25706—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins

Abstract

PURPOSE:To provide a light recording system good in storage stability and capable of forming additionally written stable records, by forming pits only on a layer not absorbing light of a light recording medium having at least 2 layers of one absorbing wavelengths of light for writing and the other substantially not absorbing both of lights for writing and reading. CONSTITUTION:A 18nm thick platinum(Pt) layer 18 for absorbing wavelengths of writing light 2, and a 50nm thick selenium(Se) layer 4 for not absorbing wavelengths of the writing light 2 and reading light (not illustrated) are successively laminated on a polymethylmethacrylate (PMMA) base 1. A pit 5 is formed on this light recording medium, as illustrated on the figure, by irradiating the medium with the semiconductor laser beams 2 of 830 laser beams. Temp. of the Pt film 3 is raised by the absorption of the beams, the Se film located above is melted, and the pit 5 is formed. In addition, the energy density of the semiconductor laser beams 2 is set to the value or lower not causing any geometrical deformation of the Pt film 3.

Description

【発明の詳細な説明】 本発明は光記録の分野における記録方式に関する。[Detailed description of the invention] The present invention relates to a recording method in the field of optical recording.

従来、光ディスク等では、基板の上の記録層に収束した
レーザービームを照射し、記録層中に吸収された光エネ
ルギーから変換された熱によって記録層を溶融・蒸発さ
せる或いは溶融・凝集させて幾何学的形状変化（ビット
）を形成する。このようにして形成されたピットに低パ
ワーのレーザービームを照射し、反射元首の変化によシ
ピットの有無を検出して情報を読み出す。上記記録層と
してはＡｓ　−Ｔｏ系等のカルコゲン化合物を用いたも
のと有機染料を用いたものがよく使われている。Conventionally, in optical disks, the recording layer on the substrate is irradiated with a focused laser beam, and the recording layer is melted and evaporated or melted and aggregated by the heat converted from the optical energy absorbed in the recording layer to create a geometric shape. Form a scientific shape change (bit). A low-power laser beam is irradiated onto the pits formed in this way, and the presence or absence of the pits is detected based on changes in the reflected principal, and information is read out. As the above-mentioned recording layer, one using a chalcogen compound such as As--To type and one using an organic dye are often used.

しかしながら前者には成膜が６易でないこと、記録層と
して不安定であること、保存性が悪いこと等の問題があ
如、後者には読み出し光によシ膜特性の変質がおこると
いう問題があシ、これらは記録方式に起因している。However, the former has problems such as not being easy to form a film, being unstable as a recording layer, and having poor storage stability, while the latter has problems such as deterioration of film characteristics due to readout light. Yes, these are due to the recording method.

本発明の目的は保存性がよく、かつ安定性の゛よい書き
込みが出来る光記録方式を提供することにある。An object of the present invention is to provide an optical recording system that has good storage stability and allows for highly stable writing.

本発明は収束したレーザービームを、照射して幾何学的
形状変化によシ書き込みを朽なう光記録方式において、
書き込み光の波長に対する光吸収のある層と、４Ｆき込
み光と読み出し光の成長に対し〜 て実質的な光吸収のない層の少なくとも２層からなる光
記録媒体に、前記光吸収のない層にのみビントを形成す
ることによシ得られる。The present invention is an optical recording method that destroys writing by irradiating a focused laser beam and changing the geometric shape.
An optical recording medium consisting of at least two layers, a layer that absorbs light for the wavelength of the writing light, and a layer that does not substantially absorb light for the growth of the 4F write-in light and the read-out light, and the layer that does not absorb light. Obtained only by forming bints.

以下本発明の光記録方式について実施例を用いて説明す
る。第１図は本発明の一実施例を示す光記録媒体の断面
図である。ポリメチルメタクリレ−）　（ＰＭＭＡ）基
板ｌの上に、書き込み光２の波長に対して光吸収のある
層３として１８％ｍ厚の白金（Ｐす、書き込み光２と読
み出し光（図示せず）の波長に対して光吸収のないＮｌ
Ｉ４として５０％ｍ厚のセレン（Ｓ・）を連続して積層
する。この光記録媒体に波長８３０ｎｍの半導体レーザ
ービーム２を照射することによシ第２図のようにビット
５を形成した。The optical recording system of the present invention will be explained below using examples. FIG. 1 is a sectional view of an optical recording medium showing one embodiment of the present invention. On a polymethyl methacrylate (PMMA) substrate 1, a platinum (P) layer 3 with a thickness of 18% m is formed as a layer 3 that absorbs light at the wavelength of the writing light 2, and the writing light 2 and reading light (not shown) ) with no optical absorption for the wavelength
Selenium (S.) with a thickness of 50% m is continuously laminated as I4. Bits 5 were formed as shown in FIG. 2 by irradiating this optical recording medium with a semiconductor laser beam 2 having a wavelength of 830 nm.

これは、光吸収によ［ｐｔ膜の温度が上昇し、これＫよ
り上層のＳｅ膜が融解してビットが形成されるという機
構による。なお、半導体レーザービーム２のエネルギー
密度はｐｔ膜３の幾例学的形状変化が起らない値以下に
設定した。前記ピットに波長８３０ｎｍの低パワーの半
導体レーザービームを熱射することによ秒読み出しを行
なった。ピット形成により反射率は１チから４５％に変
化し、充分な変調度が得られた。Ｓｅ膜厚が４０ｍｍ、
　３０％ｍ、　２０％ｍのときには、ビット形成前の反
射率Ｖｉ６チ、１７チ。This is due to a mechanism in which the temperature of the PT film rises due to light absorption, and the Se film above the PT film melts to form bits. Note that the energy density of the semiconductor laser beam 2 was set to a value below which no geometrical shape change of the PT film 3 occurs. Second readout was performed by thermally irradiating the pit with a low power semiconductor laser beam having a wavelength of 830 nm. Due to pit formation, the reflectance changed from 1% to 45%, and a sufficient degree of modulation was obtained. Se film thickness is 40mm,
When it is 30%m and 20%m, the reflectance Vi before bit formation is 6chi and 17chi.

２９嗟であった。この書き込み、絖み出しを繰り返して
も、本発明の方式では情報の保存性がよく安定性のよい
書き込みが出来る。これは記録層であるＳ・膜が保存性
のよい膜であわ、また、読み出し光を吸収しないために
変質しないからであることと、ｐｔ膜が化学的に安定な
ためである。It took 29 minutes. Even if this writing and padding are repeated, the method of the present invention can preserve information and write with good stability. This is because the S film, which is the recording layer, is a film with good storage stability and does not change in quality because it does not absorb reading light, and the PT film is chemically stable.

なお、本実施例では光吸収のある膜としてｐｔを用いた
が、他の材料としては、化学的に安定な高融点物質であ
れば何でもよい、ただし、媒体の高感度化のためには熱
伝導率が小さく、比熱の小さいものが望ましい。この意
味ではチタン（Ｔｉ）が望ましい。また、本実施例では
光吸収のない膜としてＳ・を用いたが、他の材料として
は、化学的に安定な物質であればｆ’ｌでもよい。In this example, PT was used as the light-absorbing film, but any other material may be used as long as it is chemically stable and has a high melting point.However, in order to increase the sensitivity of the medium, thermal It is desirable to have low conductivity and low specific heat. In this sense, titanium (Ti) is preferable. Further, in this embodiment, S. was used as the film that does not absorb light, but f'l may be used as another material as long as it is a chemically stable substance.

次に、ピット形成が蒸発を含む機構の場合、本発明の光
記録方式の長所について説明する。Next, the advantages of the optical recording method of the present invention in the case where the pit formation includes evaporation will be explained.

通常の光記録媒体には、記録層へのゴミの付着及び記録
層の機械的破損を防止するために、記録層の上に空気を
介して透明カバーが設けられているが、従来の光記録媒
体では記録層が光吸収性物質であるので、ビットから蒸
発した光吸収性物質がカバーに付着する。このため大童
に情報を書き込んだ場合には記録層面での書き込み元菫
が不足し、追加書き込みが出来ないという問題が発生す
る。カバーがない光記録媒体の場合には記録層に対面す
る書き込み光収束用レンズ面に光吸収性物質が付着し、
大意に情報を書き込んだ場合には、追加書き込みが出来
ないという問題が発生する。In normal optical recording media, a transparent cover is provided over the recording layer with air in between to prevent dust from adhering to the recording layer and mechanical damage to the recording layer. Since the recording layer of the medium is a light-absorbing material, the light-absorbing material evaporated from the bits adheres to the cover. For this reason, when information is written on the ODO, there is a problem that there is insufficient writing source violet on the recording layer surface, and additional writing cannot be performed. In the case of an optical recording medium without a cover, a light-absorbing substance adheres to the writing light converging lens surface facing the recording layer.
If information is written in a rough manner, a problem arises in that additional writing is not possible.

本発明の光記録方式による記録媒体を用いて、カバーを
設けた構造の−νりは第３図のようになる。A structure in which a cover is provided using a recording medium according to the optical recording system of the present invention is shown in FIG. 3.

基板３１の上に書き込み光３２の波長に対して光吸収の
ある層３３．書き込み光３２・読み出し光（図示せず）
の波長に対して光吸収のないＮｌｌ３４が順次積層され
、この上に空気３６を介して透明カバー３７が設けられ
る。これに書き込み光を朋射すると第４図のようにピッ
ト３５が形成され、ピットから蒸発した物質はカバー３
７に付着し、薄膜３８が形成される。A layer 33 that absorbs light at the wavelength of the writing light 32 is formed on the substrate 31. Writing light 32/reading light (not shown)
Nll 34, which does not absorb light for wavelengths of , is sequentially laminated, and a transparent cover 37 is provided on top of this with air 36 interposed therebetween. When a writing light is irradiated onto this, pits 35 are formed as shown in Fig. 4, and the material evaporated from the pits is transferred to the cover 3.
7 and a thin film 38 is formed.

しかしながら、本発明の媒体ではこの薄膜の物質が光を
吸収しないので、記録層３４の上での光量が減衰される
ことはない。したがって大童に情報を書き込んだ後でも
安定に追加書き込みが出来る。However, in the medium of the present invention, the thin film material does not absorb light, so the amount of light on the recording layer 34 is not attenuated. Therefore, even after writing information to Odo, additional writing can be performed stably.

さらにまた、カバーがない場合にも、本発明の光記録方
式を用いればレンズを汚すことがないので安定な書き込
みが出来る。Furthermore, even if there is no cover, if the optical recording method of the present invention is used, the lens will not be contaminated, so stable writing can be performed.

以上述べたように本発明によｔｌは光吸収層、透明層と
もに化学的に安定な材料を辿択できるので、良好な保存
特性、安定な記録特性を示す光記録方式が得られる。As described above, according to the present invention, it is possible to select chemically stable materials for both the light absorption layer and the transparent layer of the tl, so that an optical recording system exhibiting good storage characteristics and stable recording characteristics can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例を説明するための媒体断面図
であり、第２図はピットを形成した後の媒体の断面図で
ある。第３図は本発明の他の実施例を説明するための媒
体断面図であり、第４図はビットを形成した後の媒体の
断面図である。 図において、１．３１は基板、２，３２は書き込み光１
．３．３３は書き込み光の波長に対して光吸収のある層
、４．３４Ｆｉ書き込み光と読み出し光の波長に対して
実質的な光吸収のない層、５．３５はビッ礪　１　図 壓Ｚ図FIG. 1 is a sectional view of a medium for explaining one embodiment of the present invention, and FIG. 2 is a sectional view of the medium after pits have been formed. FIG. 3 is a sectional view of a medium for explaining another embodiment of the present invention, and FIG. 4 is a sectional view of the medium after forming a bit. In the figure, 1.31 is the substrate, 2, 32 is the writing light 1
．． 3.33 is a layer that absorbs light at the wavelength of the writing light, 4.34 is a layer that does not substantially absorb light at the wavelengths of the writing light and read light, and 5.35 is shocking. 1 Figure Z diagram

Claims (1)

【特許請求の範囲】[Claims] 収束したレーザービームを照射して幾何学的形状変化（
ビット）により書き込みを行なう光゛記録方式において
、書き込み光の波長に対する光吸収のある層と書き込み
光と読み出し九の波長に対して実質的な光吸収のない層
との少なくとも２層からなる光記録媒体の、前記光吸収
のない層にのみピットを形成することを特徴とする光記
録方式。Geometric shape change (
In an optical recording system that performs writing using bits, the optical recording system consists of at least two layers: a layer that absorbs light at the wavelength of the writing light and a layer that does not substantially absorb light at the wavelengths of the writing light and readout light. An optical recording method characterized in that pits are formed only in the non-light absorbing layer of the medium.
JP57085962A 1982-05-20 1982-05-20 Light recording system Pending JPS58203644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57085962A JPS58203644A (en) 1982-05-20 1982-05-20 Light recording system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57085962A JPS58203644A (en) 1982-05-20 1982-05-20 Light recording system

Publications (1)

Publication Number Publication Date
JPS58203644A true JPS58203644A (en) 1983-11-28

Family

ID=13873359

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57085962A Pending JPS58203644A (en) 1982-05-20 1982-05-20 Light recording system

Country Status (1)

Country Link
JP (1) JPS58203644A (en)

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