JPS6174149A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPS6174149A JPS6174149A JP59197406A JP19740684A JPS6174149A JP S6174149 A JPS6174149 A JP S6174149A JP 59197406 A JP59197406 A JP 59197406A JP 19740684 A JP19740684 A JP 19740684A JP S6174149 A JPS6174149 A JP S6174149A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- layer
- light
- recording medium
- irradiation
- 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
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
- G11B7/242—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
-
- 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
-
- 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
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
-
- 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
Landscapes
- Thermal Transfer Or Thermal Recording In General (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に関するものでらる口（従来技術と
問題点）
レーザビームを集光レンズによ）微小スポットに集光し
て記録媒体面に照射し、記録媒体面に穴を形成すること
で情報を記録する方式としては種々のものが提案されて
いる口
しかし、穴の有無による記録方式では媒体平面内での密
度は、媒体に照射されるビームスポット径で決まるため
、ビームスポット径を変えずに記録密度を平面内で上げ
ることは難しい。よって記録層を媒体厚さ方向で重ねる
ことで記録容量を上げる方式が提案されている（昭和５
９年度電子通信学会総合全国大会講演論文集８５−１２
）。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an optical recording medium. (Prior Art and Problems) A laser beam is condensed into a minute spot by a condensing lens and recorded. Various methods have been proposed for recording information by irradiating the medium surface and forming holes on the recording medium surface. However, in the recording method based on the presence or absence of holes, the density within the medium plane is It is difficult to increase the recording density within a plane without changing the beam spot diameter. Therefore, a method has been proposed to increase the recording capacity by overlapping the recording layers in the thickness direction of the medium (Showa 5).
Proceedings of the 9th Annual National Conference of the Institute of Electronics and Communication Engineers 85-12
).
第１図に従来の記録媒体構成を示す。第１．第２゜第３
の光吸収層２，４．７の上下に青色発色剤１゜赤色発色
剤５．緑色発色剤６と、顕色剤３，８の層を基板９上に
有し、第１の光吸収層に光照射されると青色に、第２．
第３の光吸収層ではそれぞれ赤色、緑色の発色を示す。FIG. 1 shows the configuration of a conventional recording medium. 1st. 2nd゜3rd
Above and below the light absorbing layer 2, 4.7, a blue coloring agent 1° and a red coloring agent 5. A layer of a green coloring agent 6 and color developers 3 and 8 is formed on a substrate 9, and when the first light absorbing layer is irradiated with light, it turns blue, and the second layer turns blue.
The third light absorption layer exhibits red and green colors, respectively.
ビームスポットの深さ方向の焦点位置を変えることで各
吸収層への記録および再生を行なっている〇
しかし、ビームスポットの焦点深度の差で各吸収ｉｔ区
別するためには、各吸収層の間隔が１０μｍ以上あるこ
とが必要となる。これは眉間の間隔がこれ以上近いと、
クロストークが生じて各層を独立に再生することが難し
くなるためである。Recording and reproduction in each absorption layer is performed by changing the focal position of the beam spot in the depth direction. However, in order to distinguish each absorption layer by the difference in the focal depth of the beam spot, it is necessary to change the distance between each absorption layer. is required to be 10 μm or more. This means that if the distance between the eyebrows is closer than this,
This is because crosstalk occurs and it becomes difficult to reproduce each layer independently.
よって各層をかなシの厚さで均一に形成することが求め
られるが、広い面積の記録媒体を形成することは難し？
ｏビームスポットも深さ方向へ１０μｍ以上移動する必
要がア夛、スポット位置の制御が複雑になる〇
また、第２．第３の光吸収層へ光照射を行う場合には、
上方の層での光吸収は避けられないためパワーの損失が
大きい。Therefore, it is necessary to form each layer with a uniform thickness, but is it difficult to form a recording medium with a wide area?
o The beam spot also needs to be moved by 10 μm or more in the depth direction, making control of the spot position complicated. When irradiating light to the third light absorption layer,
Since light absorption in the upper layer is unavoidable, power loss is large.
（発明の目的）
本発明の目的は上記のような欠点を除去せしめ、記録容
量金層すことが可能な記録媒体を提案するものである〇
（発明の構成）
本発明の光記録媒体は、吸収する波長が異なる第１程お
よび第２種の記録層を交互に積層したγΦ全構成となっ
ている。又、もう１つの光記録媒体は上記記録層間に光
吸収の少ない低融点の記録層を挾んだ構成となっている
。(Object of the Invention) The object of the present invention is to eliminate the above-mentioned drawbacks and to propose a recording medium that can have a recording capacity of a gold layer. (Configuration of the Invention) The optical recording medium of the present invention has It has a γΦ overall structure in which first and second type recording layers that absorb different wavelengths are alternately laminated. Another optical recording medium has a structure in which a low-melting-point recording layer with little light absorption is sandwiched between the recording layers.
（構成の詳細な説明）
第２図は本発明による記録媒体の構成例を示す図であり
、吸収する元の波長が互いに異なる第１種の記録層１０
および第２種の記録層１１を基板９上に交互に！Ｒ屑し
ている。(Detailed description of the structure) FIG. 2 is a diagram showing an example of the structure of the recording medium according to the present invention, in which first type recording layers 10 whose original wavelengths of absorption are different from each other are shown.
and the second type of recording layer 11 alternately on the substrate 9! There is rubbish.
穴を形成するときは、第１種の記録層の吸収波長λ１の
光と第２種の記録層の吸収波長λ２の光とを用いる。１
層のみを除去するときはλ、の光を、２層除去するとき
には、λ、の光を照射した後にλ。When forming the holes, light having an absorption wavelength λ1 of the first type recording layer and light having an absorption wavelength λ2 of the second type recording layer are used. 1
When removing only a layer, the light of λ is applied, and when removing two layers, the light of λ is applied and then the light of λ is applied.
の光を照射すればよい。このようにλ、とλ２の光を交
互に照射することで、順次深さの異なる穴を形成してい
くことができる〇
ただしこの構成では、λ１の光を照射している場合も熱
伝導で第２種の記録層まで穴が拡大してしまう可能性が
あるだめ、光の照射時間およびパワーを制限する必要が
ある。All you have to do is irradiate it with light. In this way, by alternately irradiating λ and λ2 light, holes with different depths can be formed sequentially.However, with this configuration, even when λ1 light is irradiated, heat conduction is not possible. Since there is a possibility that the hole may expand to the second type recording layer, it is necessary to limit the light irradiation time and power.
第３図は第１種および第２種の記録層の間に光吸収は少
ないが融点が低い記録層７を設けたものである。第１種
および第２ｆｔＭの記録層に穴が形成されるときにこの
記録層も同時に除去される〇第２図の例では４つの異な
る深さの穴を形成できるため、記録容量は穴の有無のみ
で情報を記録した場合に比べて１．５倍に増加すること
がわかる０さらに多層にすれば原理的にはさらに容量は
増加する。In FIG. 3, a recording layer 7 having low light absorption but a low melting point is provided between the first type and second type recording layers. When a hole is formed in the first type and second ftM recording layer, this recording layer is also removed at the same time. In the example shown in Figure 2, four different depths of holes can be formed, so the recording capacity depends on whether there is a hole or not. It can be seen that the capacity increases by 1.5 times compared to the case where information is recorded only in 0 layers.In principle, the capacity can further increase if more layers are added.
穴の深さは検出は反射光量の変化で行なうこと変化を生
じる。波長の１／４の深さで最小の光量と（実施例）
光吸収特性を有する記録媒体として、フタロシアニン系
の材料食用いることができる。例えば第１程としてバナ
ジル７タロシアニン（Ｖｏｐｃ）、第２埋として７タロ
シアニンプルー（ｃｕＰｃ ） ｆｔ用いれば、吸収波
長としてλＩ＝８３００Ｘ、λ之＝６３００Ｘｔ用いる
ことができる。吸収層間に設ける層としては、ポリスチ
レンを用いることができる。各層の深さ２ｓｏｏｌとし
ておけば、光照射パワー２〜６ ｍＷ程度で第１種およ
び第２種の記録層にそれぞれｙ′Ｃを形成することが可
能でらるり（発明の効果）
本発明によシ従来の光記録よシも容量の大きな光記録を
実現することができる。The depth of the hole changes because detection is done by changing the amount of reflected light. A phthalocyanine-based material can be used as a recording medium having a minimum light intensity at a depth of 1/4 of the wavelength (Example). For example, if vanadyl 7-talocyanine (Vopc) is used as the first step and 7-talocyanine plu (cuPc) ft is used as the second step, λI=8300X and λ=6300Xt can be used as absorption wavelengths. Polystyrene can be used as the layer provided between the absorbent layers. If the depth of each layer is set to 2 sool, it is possible to form y'C in each of the first type and second type recording layer with a light irradiation power of about 2 to 6 mW (effect of the invention). It is also possible to realize high-capacity optical recording using conventional optical recording.
第１図は従来の多層構造記録媒体の構成を示す図、第２
図、第３図は本発明による記録媒体の一構成例を示す図
、第４図は穴の深さによる反射光量の変化を示す図であ
る。
図中で
１・・・背色発色剤、５・・・赤色発色剤、７・・・緑
色発色剤、２． ４．７・・・光吸収層、３．訃・・顕
色剤、９・・・基板、１０・・・第１株記録層、１１・
・・第２ｆ′ｉｌ！記録泪、１２・・・記録層
である。
を羽し、弁理士内層 晋
第１図
第２図
第３図
第４図Figure 1 shows the structure of a conventional multilayer recording medium, Figure 2 shows the structure of a conventional multilayer recording medium.
3 and 3 are diagrams showing an example of the configuration of a recording medium according to the present invention, and FIG. 4 is a diagram showing changes in the amount of reflected light depending on the depth of the hole. In the figure, 1... back coloring agent, 5... red coloring agent, 7... green coloring agent, 2. 4.7...Light absorption layer, 3. 9. Color developer, 9. Substrate, 10. 1st stock recording layer, 11.
...Second f'il! Recording tears, 12...Recording layer. Susumu, the inner layer of patent attorneys, Figure 1, Figure 2, Figure 3, Figure 4
Claims (2)
の記録層を交互に積層したことを特徴とする光記録媒体
。(1) An optical recording medium characterized in that first and second type recording layers that absorb different wavelengths are alternately laminated.
録層を、光吸収の少ない低融点の記録層を間に挾んで交
互に積層したことを特徴とする光記録媒体。(2) An optical recording medium characterized in that first and second types of recording layers that absorb different wavelengths are alternately stacked with a low-melting-point recording layer that absorbs little light interposed therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59197406A JPS6174149A (en) | 1984-09-20 | 1984-09-20 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59197406A JPS6174149A (en) | 1984-09-20 | 1984-09-20 | Optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6174149A true JPS6174149A (en) | 1986-04-16 |
Family
ID=16373980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59197406A Pending JPS6174149A (en) | 1984-09-20 | 1984-09-20 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6174149A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5126996A (en) * | 1988-11-08 | 1992-06-30 | Pioneer Electronic Corporation | Optical information record carrier and the method of producing the same |
| US5171392A (en) * | 1988-11-08 | 1992-12-15 | Pioneer Electronic Corporation | Method of producing an optical information record carrier |
| JPH0954812A (en) * | 1995-08-11 | 1997-02-25 | Nec Corp | Optical recording medium and reader |
-
1984
- 1984-09-20 JP JP59197406A patent/JPS6174149A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5126996A (en) * | 1988-11-08 | 1992-06-30 | Pioneer Electronic Corporation | Optical information record carrier and the method of producing the same |
| US5171392A (en) * | 1988-11-08 | 1992-12-15 | Pioneer Electronic Corporation | Method of producing an optical information record carrier |
| JPH0954812A (en) * | 1995-08-11 | 1997-02-25 | Nec Corp | Optical recording medium and reader |
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