JPS6194249A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPS6194249A JPS6194249A JP59216814A JP21681484A JPS6194249A JP S6194249 A JPS6194249 A JP S6194249A JP 59216814 A JP59216814 A JP 59216814A JP 21681484 A JP21681484 A JP 21681484A JP S6194249 A JPS6194249 A JP S6194249A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- thickness
- hole
- refractive index
- layer
- 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.)
- Granted
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
- G11B7/2407—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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
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ある。[Detailed description of the invention] (Industrial application field) The present invention relates to optical recording media.
（従来技術と問題点）
レーザビームを集光レンズにより微少スポットに集光し
て記録媒体面に照射し、記録媒坏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。(Prior art and problems) There are various methods for recording information by condensing a laser beam into a minute spot using a condensing lens and irradiating it onto the surface of the recording medium to form a hole in the surface of the recording medium. Proposed.
しかし穴の有無による記録方式では記録媒体平面内での
密度は記録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
上げることは雌しい、よりて記録ｌ＃を数層重ねること
で記録容量を上げる方式が提案されている（昭和５９年
度電子通信学会総合全国大会講演論文集８５−１２＞。However, in the recording method based on the presence or absence of holes, the density within the plane of the recording medium is determined by the diameter of the beam spot irradiated onto the recording medium, so it is difficult to increase the recording density within the plane without changing the beam spot diameter. A method has been proposed to increase the recording capacity by stacking several layers of recording l# (Proceedings of the 1985 National Conference of the Institute of Electronics and Communication Engineers, Proceedings 85-12).
第３図にこのような方式に用いる記録媒体の一構成例を
示す、第１．第２．ｉｇ３の光吸収層４２゜必、４７の
上下に青色発色剤４１．赤色発色剤４５．緑色発色剤物
と、顕色剤４３の層を有し、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、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光吸収層への記録および再生を行
なっている。FIG. 3 shows an example of the configuration of a recording medium used in such a system. Second. The light absorbing layer 42 of ig3 is required, and the blue coloring agent 41 is placed above and below 47. Red coloring agent 45. It has a layer of a green color forming agent and a color developer 43, and when the first light absorbing layer is irradiated with light, it turns blue, and the second layer turns blue. In the third light absorption layer, recording and reproduction are performed in each light absorption layer by changing the focal position of the beam spot in the depth direction, which exhibits red and green colors, respectively.
しかし、ビームスポットの焦点深度の差で各光吸収層を
区別するためには各光吸収ノーの間隔が１０μｍ以上あ
ることが必要となる。これは１層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。However, in order to distinguish each light absorption layer by the difference in the depth of focus of the beam spot, it is necessary that the interval between each light absorption layer be 10 μm or more. This is because if the distance between layers is any closer, crosstalk will occur, making it difficult to reproduce each layer independently.
よって各層を力）なり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雉し
い。ビームスポットも深さ方向へ１０μｍ以上移動する
必要があり、スポット位置の制御が複雑になる。また第
３の光吸収層へ光照射を行う場合にも第１および第２の
光吸収層で吸収が行なわれるため、照射パワーの損失が
大きい、などの欠点がある。Therefore, it is required to uniformly form each layer with a certain thickness, but it is difficult to form a recording medium with a wide area. The beam spot also needs to be moved by 10 μm or more in the depth direction, making control of the spot position complicated. Further, even when the third light absorption layer is irradiated with light, absorption is performed in the first and second light absorption layers, so there are drawbacks such as a large loss of irradiation power.
（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。(Purpose of the invention) The object of the present invention is to eliminate the above-mentioned drawbacks.
記録・容量を増すことが可能な記録媒体を提案するもの
である。This paper proposes a recording medium that can increase recording capacity.
Ｃ問題点を解決するための手段）
本発明の光記録媒体は、光照射により穴が形成される屈
折率ｎ、厚さｄの記録層が、前記屈折率ｎよりも小さい
屈折率を有する基板上に設けられ。Means for Solving Problem C) The optical recording medium of the present invention is characterized in that the recording layer having a refractive index n and a thickness d in which holes are formed by light irradiation is a substrate having a refractive index smaller than the refractive index n. set on top.
さらｉこ、前記厚さｄが
ｄ≦λ／４ｎ
（但しλは記録情報の再生に用いる光の波長）を満足す
るように定められでいる。Additionally, the thickness d is determined to satisfy d≦λ/4n (where λ is the wavelength of light used to reproduce recorded information).
第１図は本発明による記録媒体の一構成例を示す図であ
る。基板２の上に記録層１を形成している。穴の深さは
照射する光の強度または照射時間を変えることで制御す
ることができる。FIG. 1 is a diagram showing an example of the configuration of a recording medium according to the present invention. A recording layer 1 is formed on a substrate 2. The depth of the hole can be controlled by changing the intensity or irradiation time of the irradiated light.
第１図の構成においては、記録層表面の反射率は記録層
の厚さによって異なる０例えばガラス基板を用い記録層
として、酸化バナジウムフタロシアニン（ＶＯＰｃ）
を用い、記録・再生の波長として８３００ Ａを使用
した場合、記録層の複素屈折率は（２，９−ｊ Ｏ，８
）となる、記録層の厚さによる反射率の変化を第２図に
示す、厚さｄ＝８３００／（４×２．９）； ７００
Ａ近傍において最も高い反射率が得られる。In the configuration shown in FIG. 1, the reflectance of the surface of the recording layer varies depending on the thickness of the recording layer.
When using 8300 A as the recording/reproducing wavelength, the complex refractive index of the recording layer is (2,9-j O,8
), the change in reflectance depending on the thickness of the recording layer is shown in Figure 2, thickness d = 8300/(4 x 2.9); 700
The highest reflectance is obtained near A.
これは記録層表面からの反射と、記録層と基板との境界
からの反射が同相で重なり合うためである。This is because the reflection from the surface of the recording layer and the reflection from the boundary between the recording layer and the substrate overlap in phase.
この；−４より薄くなれば反射率は単調に減少すること
がわ力）る、光照射ｔこよりて穴が形成されると穴の内
部では記録層厚が減少し反射率が低下する。When the thickness becomes thinner than -4, the reflectance monotonically decreases.When a hole is formed by light irradiation, the recording layer thickness decreases inside the hole and the reflectance decreases.
穴の内部での残存膜厚により反射率は異なることが＠２
図より明らかである。すなわち１層厚ｄをｄ≦λ／４
ｎ としておけば、穴の深さが決まると反射率は一義
的に決まる。これより穴の深さを変えることと反射率を
変化させ多値記録が可能となる０例えば第２図の記録媒
体では層厚を７０ＯＡと変えることで反射率を、３２％
、１５％、４チと３段階に変化することができ・、４値
の情報のＢｄ会が可能であった。The reflectance varies depending on the thickness of the remaining film inside the hole @2
It is clear from the figure. In other words, one layer thickness d is d≦λ/4
If n is set, the reflectance is uniquely determined when the depth of the hole is determined. From this, multilevel recording is possible by changing the depth of the hole and the reflectance.For example, in the recording medium shown in Figure 2, by changing the layer thickness to 70OA, the reflectance can be reduced to 32%.
, 15%, 4chi, and Bd meeting of 4-value information was possible.
（発明の効果） 本発明によれば、穴の深ざを変えて記録できる。(Effect of the invention) According to the present invention, it is possible to record by changing the depth of the hole.
すなわち、多１直記録ができるため従来の光記録よりも
容量の大きな光記録を容易に笑現することが記録しても
ビームスポットの移動は少なくてすみくてよいため）照
射パワーの損失が小さくおさえられる。In other words, since it is possible to perform multiple direct recordings, optical recording with a larger capacity than conventional optical recording can be realized easily. It can be kept small.
第１図は本発明による記録媒体の一構成・列を示Ｔ図、
第２図は記録層厚による反射率変化を示す図、第３図は
従来の多層構造記録媒体を示す図である。
図中で、１・・・記録層、２・・・基板、４１・・・青
色発色剤、４５・・・赤色発色剤、４６・・・緑色発色
剤、４２，４４゜４７・・・光吸収層、招・・・頭色剤
である。FIG. 1 is a T diagram showing one configuration and array of a recording medium according to the present invention;
FIG. 2 is a diagram showing changes in reflectance depending on recording layer thickness, and FIG. 3 is a diagram showing a conventional multilayer structure recording medium. In the figure, 1... Recording layer, 2... Substrate, 41... Blue coloring agent, 45... Red coloring agent, 46... Green coloring agent, 42, 44°, 47... Light Absorbent layer, absorbent... head coloring agent.
Claims (1)
が、前記屈折率ｎよりも小さい屈折率を有する基板上に
設けられ、さらに、前記厚さｄがｄ≦λ／４ｎ （但しλは記録情報の再生に用いる光の波長）を満足す
るように定められていることを特徴とする光記録媒体。[Scope of Claims] A recording layer having a refractive index n and a thickness d in which holes are formed by light irradiation is provided on a substrate having a refractive index smaller than the refractive index n, and further, the recording layer has a thickness d. An optical recording medium characterized in that it is determined to satisfy d≦λ/4n (where λ is the wavelength of light used to reproduce recorded information).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59216814A JPH065584B2 (en) | 1984-10-16 | 1984-10-16 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59216814A JPH065584B2 (en) | 1984-10-16 | 1984-10-16 | Optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6194249A true JPS6194249A (en) | 1986-05-13 |
| JPH065584B2 JPH065584B2 (en) | 1994-01-19 |
Family
ID=16694303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59216814A Expired - Lifetime JPH065584B2 (en) | 1984-10-16 | 1984-10-16 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH065584B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989011147A1 (en) * | 1988-05-11 | 1989-11-16 | Eastman Kodak Company | Ternary optical elements and methods |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5597033A (en) * | 1979-01-15 | 1980-07-23 | Philips Nv | Optical recording element and method of recording optical information |
-
1984
- 1984-10-16 JP JP59216814A patent/JPH065584B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5597033A (en) * | 1979-01-15 | 1980-07-23 | Philips Nv | Optical recording element and method of recording optical information |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989011147A1 (en) * | 1988-05-11 | 1989-11-16 | Eastman Kodak Company | Ternary optical elements and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH065584B2 (en) | 1994-01-19 |
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