JPS6164491A - Optical recording method and body - Google Patents

Optical recording method and body

Info

Publication number
JPS6164491A
JPS6164491A JP59186822A JP18682284A JPS6164491A JP S6164491 A JPS6164491 A JP S6164491A JP 59186822 A JP59186822 A JP 59186822A JP 18682284 A JP18682284 A JP 18682284A JP S6164491 A JPS6164491 A JP S6164491A
Authority
JP
Japan
Prior art keywords
holes
recording
different depths
layer
medium
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
Application number
JP59186822A
Other languages
Japanese (ja)
Other versions
JPH0553635B2 (en
Inventor
Yutaka Yamanaka
豊 山中
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
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 filed Critical NEC Corp
Priority to JP59186822A priority Critical patent/JPS6164491A/en
Publication of JPS6164491A publication Critical patent/JPS6164491A/en
Publication of JPH0553635B2 publication Critical patent/JPH0553635B2/ja
Granted 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
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G11B7/24088—Pits for storing more than two values, i.e. multi-valued recording for data or prepits
    • 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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To obtain a recording capable of increasing recording capacity, in a recording medium having one or a large number of recording layers forming a hole by the irradiation of light, by forming holes having different depths to the recording medium from the surface thereof and constituting a laminate from various materials in arrangement such that the material closer to the upper layer is low in light irradiating power required in the formation of the holes. CONSTITUTION:The drawing shows a recording medium wherein four different recording layers 11-14 are laminated to a substrate 9. By the changing the number of recording layers forming holes, holes having different depths can be formed. In the case of four layers, because four kinds of holes having different depths can be formed, recording capacity increases by two times as compared with a case recording information only by the presence or absence of holes. In multi-layered medium, min. light irradiating power required in the formation of the holes is made lower in the layer closer to an upper layer and holes having different depths can be formed by changing irradiation power. In low irradiation power, as power is raised only in the upper side layer, holes can be formed down to the lower side layer.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は光記録用の光記録媒体および光記録方式に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical recording medium for optical recording and an optical recording method.

（従来技術と問題点） レーザビームを集光レンズにより微小スポットに集光し
て記録媒体２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。(Prior art and problems) There are various methods for recording information by focusing a laser beam onto a minute spot using a condensing lens and irradiating it onto two surfaces of a recording medium to form holes on the surface of the recording medium. Proposed.

−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　８５−１
２）。-However, in the recording method based on the presence or absence of holes, the density within the plane of the medium is determined by the diameter of the beam spot irradiated onto the medium, so it is difficult to increase the recording density within the 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).
9th year IEICE General Conference National Conference Proceedings 85-1
2).

第１図に従来の媒体構成を示す。第１＃第２ｊ第３の光
吸収層２ν４＃゛７の上下に青色発色剤１ｊ赤色発色剤
５２緑色発色剤７と、顕色剤３り８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ｐ緑色の発色を示す。ビームス余ッ
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。FIG. 1 shows a conventional media configuration. The first light absorption layer has a blue color former 1j red color former 52 green color former 7 and a color developer 38 above and below the first #2j third light absorption layer 2ν4#゛7. When irradiated with light, the layer becomes blue, and the second and third light absorbing layers exhibit red and green colors, respectively. Recording and reproduction in each absorption layer is performed by changing the focal position of the beam surplus in the depth direction.

しかし、ビームスポットの焦点深度の差で各吸収層を区
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。より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
成することは難しい。ビームスポットも深さ方向へ１０
μｍ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。However, in order to distinguish each absorption layer by the difference in the focal depth of the beam spot, it is necessary that the interval between each absorption layer be 10 μm or more. This is because if the distance between the eyebrows becomes closer than this, crosstalk will occur and it will be difficult to reproduce each layer independently. Therefore, it is required to form each layer uniformly with a certain thickness, but it is difficult to form a recording medium with a wide area. The beam spot is also 10 in the depth direction.
It is necessary to move the spot by more than μm, making control of the spot position complicated. Furthermore, even when the third light absorption layer is irradiated with light, absorption occurs in the first and second light absorption layers, resulting in 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、記録容
量を増すことが可能な記録媒体および記録方式を提案す
るものである。(Objective of the Invention) An object of the present invention is to propose a recording medium and a recording method that can eliminate the above-mentioned drawbacks and increase the recording capacity.

（発明の構成） 本発明の光記録方式は、光照射により大の形成する記録
層を一層または多層布する記録媒体に、前記記録媒体表
面から深さが異なる穴を形成することで情報を記録する
ことを特徴とする。また本発明の記録媒体は基板上に光
照射により穴を形成する層が多層積層された構造で、か
つ、この積層体は上層程穴開けに要する光照射パワーが
小さい材料で構成されている点に特徴がある。(Structure of the Invention) The optical recording method of the present invention records information by forming holes with different depths from the surface of the recording medium in a recording medium in which one or more recording layers are formed by light irradiation. It is characterized by Furthermore, the recording medium of the present invention has a structure in which multiple layers are laminated on a substrate to form holes by light irradiation, and this laminate is made of a material that requires lower light irradiation power for making holes as the upper layer increases. There are characteristics.

（構成の詳細な説明） 第２図は一層の記録媒体１０に深さの異なる穴を形成し
た図である。このような穴は光の照射時間および照射パ
ワーを変えることにより形成可能である。また深さは１
μｍ以下であるので、ビームスポットの焦点の深さ方向
の位置を変える必要はない。(Detailed Description of Configuration) FIG. 2 is a diagram showing holes of different depths formed in a single layer of recording medium 10. Such holes can be formed by changing the light irradiation time and irradiation power. Also, the depth is 1
Since it is less than μm, there is no need to change the position of the focal point of the beam spot in the depth direction.

第３図は４つの異なる記録層１１〜１４を基板９上へ積
層した記録媒体を示す図である。この例では穴を形成す
る記録層の数を変えることで異なる深さの穴を形成する
ことができる。第３図では４層であるので４種類の深さ
の異なる穴が形成できるため、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２倍に増加することがわ
かる。FIG. 3 shows a recording medium in which four different recording layers 11 to 14 are stacked on a substrate 9. In this example, holes of different depths can be formed by changing the number of recording layers forming holes. In FIG. 3, since there are four layers, four types of holes with different depths can be formed, so it can be seen that the recording capacity is doubled compared to the case where information is recorded only by the presence or absence of holes.

さらに多層にすれば、原理的にはさらに容量が増加する
。If the number of layers is further increased, the capacity can theoretically be further increased.

多層媒体においては穴形成に必要な最小光照射パワーを
上側の層ほど低くしておくことで、照射パワーを変えて
異なる深さの穴を形成できることがわかる。低照射パワ
ーでは上側の層のみに、パワーを上けるほど下側の層ま
で穴が形成されることになる。It can be seen that in a multilayer medium, by lowering the minimum light irradiation power required for hole formation in the upper layers, holes of different depths can be formed by changing the irradiation power. At low irradiation power, holes are formed only in the upper layer, and as the power is increased, holes are formed in the lower layer.

穴の深さの検出は反射光量の変化で行なうことができる
。穴の内側と外側からの反射光の干渉効果により、穴の
深さに対して第４図のよう々光量の変化を生じる。波長
の１／４の深さで最小の光量となる。よってこれよシ浅
い穴の深さであれば反射光量の異いて深さを検出できる
ことになる。The depth of the hole can be detected by changing the amount of reflected light. Due to the interference effect of reflected light from the inside and outside of the hole, the amount of light changes as shown in FIG. 4 with respect to the depth of the hole. The minimum amount of light is reached at a depth of 1/4 of the wavelength. Therefore, if the depth of the hole is shallower than this, the depth can be detected by varying the amount of reflected light.

（実施例） 単層の媒体としては０．２μｍ程度の厚さを得るために
は有機媒体が有効である。記録媒体としてはバナジルフ
タロシアニン（ＶｏＰｅ　）や、ボリスチレ／中にＴｅ
等の金属を分散させたものを蒸着等で基板上へ形成した
ものが利用できる。１〜１０ｍＷの間で光照射パワーを
変化させることで穴の深さが変化できる。(Example) As a single layer medium, an organic medium is effective for obtaining a thickness of about 0.2 μm. As a recording medium, vanadyl phthalocyanine (VoPe) and Boristile/Te
It is possible to use a material in which a metal such as the following is dispersed and formed on a substrate by vapor deposition or the like. The depth of the hole can be changed by changing the light irradiation power between 1 and 10 mW.

多層媒体としては、基板上にＴｉ　＝　ＴｅＯｘ　−Ｔ
ｅを順次５００Ｘずつ積層して３層の媒体を形成できる
。それぞれの層の穴形成に必要な最小光照射パワーは１
０　ｍＷ　ｐ　５　ｍＷす３　ｍＷである。よって光照
射パワーにより３通υの異なる深さの穴を実現できる。As a multilayer medium, Ti = TeOx −T on the substrate
It is possible to form a three-layer medium by sequentially stacking 500× layers. The minimum light irradiation power required to form holes in each layer is 1
0 mW p 5 mW 3 mW. Therefore, depending on the light irradiation power, holes with three different depths υ can be realized.

（発明の効果） 本発明により従来の光記録よりも容量の大きな光記録を
実現することができる。(Effects of the Invention) According to the present invention, optical recording with a larger capacity than conventional optical recording can be realized.

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

第１図は従来の多層構造媒体の構成を示す図、第２図は
本発明に利用した単層媒体を示す図、第３図は本発明に
よる多層媒体を示す図、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・・・青色発色剤、５・・・赤色発色剤、７・・・緑
色発色剤、２ν４す７・・・光吸収層、３ｊ８・・・顕
色剤、９・・・基板、１０〜１４・・・記録層　である
。 ７１　図 ７１−２　　図 ７３　図 ７４図 Ｏ入／４　　　穴の深さFig. 1 shows the structure of a conventional multilayer structure medium, Fig. 2 shows a single layer medium used in the present invention, Fig. 3 shows a multilayer medium according to the present invention, and Fig. 4 shows the structure of the hole. FIG. 3 is a diagram showing changes in the amount of reflected light depending on depth. In the figure, 1... Blue color former, 5... Red color former, 7... Green color former, 2v4su7... Light absorption layer, 3j8... Color developer, 9... Substrate , 10-14...recording layer. 71 Figure 71-2 Figure 73 Figure 74 Figure 0/4 Hole depth

Claims (2)

【特許請求の範囲】[Claims] （１）光照射により融解または蒸発等で穴を形成する記
録層を一層または多層に有する記録媒体に、媒体表面か
らの深さが異なる穴を形成することで情報を記録するこ
とを特徴とする光記録方式。(1) Information is recorded by forming holes at different depths from the medium surface in a recording medium having one or more recording layers that form holes by melting or evaporating when irradiated with light. Optical recording method. （２）光照射により融解または蒸発等で穴を形成する記
録材料の前記穴形成に必要な最小光照射パワーを閾値パ
ワーとするとき、基板上に閾値パワーの高い材料から順
次積層し、上側の層ほど閾値パワーが低い材料で構成さ
れる多層構造を有することを特徴とする光記録媒体。(2) When the minimum light irradiation power necessary for forming holes in a recording material that forms holes by melting or evaporation upon light irradiation is taken as the threshold power, the materials are laminated on the substrate in order from the highest threshold power, and the upper An optical recording medium characterized in that it has a multilayer structure made of materials whose threshold power is lower for each layer.
JP59186822A 1984-09-06 1984-09-06 Optical recording method and body Granted JPS6164491A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59186822A JPS6164491A (en) 1984-09-06 1984-09-06 Optical recording method and body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59186822A JPS6164491A (en) 1984-09-06 1984-09-06 Optical recording method and body

Publications (2)

Publication Number Publication Date
JPS6164491A true JPS6164491A (en) 1986-04-02
JPH0553635B2 JPH0553635B2 (en) 1993-08-10

Family

ID=16195210

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59186822A Granted JPS6164491A (en) 1984-09-06 1984-09-06 Optical recording method and body

Country Status (1)

Country Link
JP (1) JPS6164491A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63173724U (en) * 1987-04-30 1988-11-11

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63173724U (en) * 1987-04-30 1988-11-11

Also Published As

Publication number Publication date
JPH0553635B2 (en) 1993-08-10

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