JPH023122A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPH023122A JPH023122A JP63147693A JP14769388A JPH023122A JP H023122 A JPH023122 A JP H023122A JP 63147693 A JP63147693 A JP 63147693A JP 14769388 A JP14769388 A JP 14769388A JP H023122 A JPH023122 A JP H023122A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- recording
- recording layer
- optical
- rate
- 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 35
- 239000010410 layer Substances 0.000 claims description 60
- 238000001782 photodegradation Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract description 8
- 230000006866 deterioration Effects 0.000 abstract description 8
- 238000010791 quenching Methods 0.000 abstract description 7
- 230000000171 quenching effect Effects 0.000 abstract description 7
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- PZOUSPYUWWUPPK-UHFFFAOYSA-N indole Natural products CC1=CC=CC2=C1C=CN2 PZOUSPYUWWUPPK-UHFFFAOYSA-N 0.000 abstract description 3
- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 abstract description 3
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 abstract description 3
- 230000032683 aging Effects 0.000 abstract 2
- 239000000975 dye Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- CUFNKYGDVFVPHO-UHFFFAOYSA-N azulene Chemical compound C1=CC=CC2=CC=CC2=C1 CUFNKYGDVFVPHO-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229930192627 Naphthoquinone Natural products 0.000 description 1
- 101150054854 POU1F1 gene Proteins 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002791 naphthoquinones Chemical class 0.000 description 1
- 239000001007 phthalocyanine dye Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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〕
本発明は繰り返し読み出し能力の向上した光記録媒体に
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 with improved repeat readability.
記録層にピットを形成して記録を行うタイプの従来の光
記録媒体の構造例を第２図に断面図で示す。図中１は基
板、２′は記録層、５は記録ピット、Ａは未記録部、Ｂ
は記録部である。この光記録媒体は基板１上に単層構成
の記録層２′を設けてなる構造を有し、データの記録は
レーザ光を記録層２′に集光し記録ピット５を形成する
ことにより行われる。そしてデータの再生は記録時より
弱いパワーのレーザ光を記録層２′に照射して未記録部
（Ａ）とピット記録部（Ｂ）からの反射光の信号レベル
の違いを検出することにより行われる。An example of the structure of a conventional optical recording medium of the type in which recording is performed by forming pits in a recording layer is shown in cross-sectional view in FIG. In the figure, 1 is the substrate, 2' is the recording layer, 5 is the recording pit, A is the unrecorded area, and B
is the recording section. This optical recording medium has a structure in which a single-layer recording layer 2' is provided on a substrate 1, and data is recorded by focusing a laser beam on the recording layer 2' to form recording pits 5. be exposed. Data reproduction is then performed by irradiating the recording layer 2' with a laser beam of a lower power than during recording and detecting the difference in signal level of the reflected light from the unrecorded area (A) and the pit recorded area (B). be exposed.
しかしながら、上記の如き光記録媒体は、データの繰り
返し読み出しにより記録膜が光劣化又は熱劣化を起すこ
とが知られている。この記録膜の劣化により、反射率が
下がり、信号振幅が低下し、データ読み出しエラーが発
生する。繰り返し読み出し能力を向上するには、一般に
記録膜に光クエンチング剤を混入する方法が知られてい
るが、この方法を用いると副作用として保存信頼性の低
下。However, it is known that the recording film of the above-mentioned optical recording medium suffers from optical deterioration or thermal deterioration due to repeated reading of data. This deterioration of the recording film lowers the reflectance, lowers the signal amplitude, and causes data read errors. In order to improve the repeat reading ability, it is generally known to mix an optical quenching agent into the recording film, but this method has a side effect of decreasing storage reliability.
記録感度の低下が起こりやすく、多量のクエンチング剤
を混入することは難しい。It is difficult to mix a large amount of quenching agent, as this tends to cause a decrease in recording sensitivity.
本発明はこのような従来技術の問題点に鑑み、保存信頼
性及び記録感度を低下させずにデータの繰り返し読み出
し特性が向上した光記録媒体を提供することを目的とす
る。SUMMARY OF THE INVENTION In view of the problems of the prior art, it is an object of the present invention to provide an optical recording medium with improved data readout characteristics without reducing storage reliability and recording sensitivity.
本発明によれば、上記課題を解決するため、基板上に直
接又は下引き層を介して記録層を設けさらに必要に応じ
て保護層を設けてなる光記録媒体において、前記記録層
が、記録層表面よりも記録層内部の方が相対的に光劣化
速度が速い層構成を有することを特徴とする光記録媒体
が提供される。According to the present invention, in order to solve the above problems, there is provided an optical recording medium in which a recording layer is provided on a substrate directly or via an undercoat layer, and further a protective layer is provided as necessary. An optical recording medium is provided that has a layer structure in which the interior of the recording layer has a relatively faster photodegradation rate than the surface of the layer.
次に図面を参照して本発明を更に詳細に説明する。第１
図は本発明による光記録媒体の一橋造例を示す断面図で
、同図において第２図と同様な要素には同じ参照符号を
付しである。この光記録媒体は、基板ｌ上に、２層構造
すなわち記録層■３及び記録層■４からなる記録層２を
積層して構成される。そして、記録層■３は記録層■４
よりも相対的に光劣化速度が速い材料で構成される。Next, the present invention will be explained in more detail with reference to the drawings. 1st
The figure is a sectional view showing an example of the Hitotsubashi construction of an optical recording medium according to the present invention, in which elements similar to those in FIG. 2 are given the same reference numerals. This optical recording medium is constructed by laminating a recording layer 2 having a two-layer structure, that is, a recording layer (1) 3 and a recording layer (2) 4, on a substrate (1). And the recording layer ■3 is the recording layer ■4
It is made of a material whose photodegradation rate is relatively faster than that of the
本発明において、記録層２を上記構成とした理由を以下
に述べる。In the present invention, the reason why the recording layer 2 has the above structure will be described below.
第２図に示す単層記録層２′（記録層表面と内部の光劣
化速度が等しい）を有する従来の光記録媒体における繰
り返し読み出し回数と信号レベルの関係を第３図に示す
。同面により、記録層２′の未記録部（Ａ）の光劣化速
度はピット記録部（Ｂ）に比べ速くなっていることが分
かる。これは、ピット記録部（Ｂ）の周辺の物性がピッ
ト形成時のレーザ光照射により熱溶融等により未記録部
（Ａ）と異なっているためと考えられる。このように従
来の光記録媒体では、未記録部（Ａ）の光劣化速度はピ
ット記録部（Ｂ）に比べ速いため、記録ピット信号振幅
（＝未記録部（Ａ）信号レベル−ピット記録部（Ｂ）信
号レベル）が繰り返し読み出し回数とともに低下し、読
み出しエラーが発生しやすくなる。この点に鑑み、本発
明では、繰り返し読み出し回数が大きくなっても記録ピ
ント信号振幅が低下しないように記録ＪＰｊ２を２層構
造（記録層■３及び記録層■４）とし、記録層表面（記
録層■４）よりも記録層内部（記録層■３）の方が相対
的に光劣化速度が速くなるように構成した。FIG. 3 shows the relationship between the number of repeated readings and the signal level in a conventional optical recording medium having the single-layer recording layer 2' shown in FIG. 2 (the optical deterioration rate on the surface and inside of the recording layer are equal). It can be seen from the same surface that the photodegradation rate of the unrecorded portion (A) of the recording layer 2' is faster than that of the pit recorded portion (B). This is considered to be because the physical properties around the pit recorded area (B) are different from those of the unrecorded area (A) due to thermal melting due to laser beam irradiation during pit formation. As described above, in conventional optical recording media, the optical deterioration rate of the unrecorded area (A) is faster than that of the pit recorded area (B), so the recorded pit signal amplitude (= unrecorded area (A) signal level - pit recorded area (B) signal level) decreases with the number of repeated readings, making reading errors more likely to occur. In view of this, in the present invention, the recording JPj2 has a two-layer structure (recording layer 3 and recording layer 4) so that the recording focus signal amplitude does not decrease even if the number of repeated readouts increases, The inside of the recording layer (recording layer (3)) was constructed so that the photodegradation rate was relatively faster than that of layer (4).
このようにすることにより、本発明の光記録媒体におい
ては、従来と同様繰り返し読み出しにより記録層２が光
劣化を起すが、記録層■３は記＠層■４よりも光劣化速
度が速いので、第４図に示すように、従来の単層記録層
の光記録媒体に比べ未記録部（Ａ）の信号レベル（記録
層■４の反射レベル）の低下速度とピット記録部（Ｂ）
の信号レベル（記録層■３の反射レベル）の低下速度と
の差が小さくなり。By doing this, in the optical recording medium of the present invention, the recording layer 2 undergoes photodeterioration due to repeated reading as in the conventional case, but the speed of photodegradation of the recording layer (3) is faster than that of the layer (4). , as shown in Fig. 4, compared to the conventional single-layer recording layer optical recording medium, the rate of decrease in the signal level (reflection level of recording layer 4) in the unrecorded area (A) and the pit recorded area (B)
The difference between the rate of decline in the signal level (reflection level of recording layer 3) becomes smaller.
記録ピット信号振幅の低下を小さくすることが出来る。It is possible to reduce the decrease in recording pit signal amplitude.
本発明の記録記媒体は、記録層内部の元方下速度Ｖ、が
記録層表面の元方下速度Ｖ よりも速ければよいが、好
ましくは３．５ｖ−＞ｖ ＞１．５ｖ、の条ｌ
Ｓ １
件がよい。In the recording medium of the present invention, it is sufficient that the original downward velocity V inside the recording layer is faster than the original downward velocity V of the surface of the recording layer, but preferably 3.5v->v>1.5v. l
S 1 item is good.
また、上記構造例では記録層２を２Ｊ９１構造としてい
るが、本発明はこれに限定されるものでなく、例えば、
単層構造であってその記録層表面と記録層内部で組成を
変化させたもの、３層構造のもの等とすることも可能で
ある。Further, in the above structure example, the recording layer 2 has a 2J91 structure, but the present invention is not limited to this, and for example,
It is also possible to have a single layer structure in which the composition is changed on the surface of the recording layer and inside the recording layer, or a three layer structure.
また、本発明で使用される記録層材料は、上記光劣下速
度条件を満足するものであればよく、有機色素、無機分
散系材料などを用いることが出来る。好ましくは有機色
素がよく、その代表例として、インドールシアニン色素
、アズレン系色素、ナフトキノン系色素、フタロシアニ
ン系色素、スクワリウム系色素などを挙げることができ
る。Further, the recording layer material used in the present invention may be any material as long as it satisfies the above-mentioned optical degradation rate conditions, and organic dyes, inorganic dispersion materials, etc. can be used. Organic dyes are preferred, and representative examples include indolecyanine dyes, azulene dyes, naphthoquinone dyes, phthalocyanine dyes, squalium dyes, and the like.
以下に実施例をあげて本発明をさらに説明するが１本発
明はこれら実施例のみに限定されるものではない。The present invention will be further explained below with reference to Examples, but the present invention is not limited to these Examples.
実施例
スタンパのトラッキング用グループ及びＩＤピットをア
クリル系フォトポリマーにより転写したアクリル基板に
インドールシアニン系色素（商品名ＮＫ２４２１）の０
，３ｗｔ％のシクロヘキサノン溶液をスピンコードする
ことにより、膜厚３００人の記録層■を形成した。この
記＠層表面にＳｉｎ、を真空蒸着し、膜厚１５０人の保
護層を形成した後、さらに前記インドールシアニン系色
素０．３ｗｔ％、下記一般式（Ｉ）の光クエンチング剤
０．０５ｗｔ％のシクロヘキサノン溶液をスピンコード
することにより膜厚３００人の記録層■を形成した。Indole cyanine dye (trade name NK2421) was applied to an acrylic substrate on which the tracking groups and ID pits of the example stamper were transferred using an acrylic photopolymer.
, 3 wt % cyclohexanone solution was spin-coded to form a recording layer (3) with a thickness of 300 mm. After vacuum-depositing Sin on the surface of the layer to form a protective layer with a thickness of 150 mm, 0.3 wt% of the indole cyanine dye and 0.05 wt% of the photoquenching agent of the following general formula (I) were added. % cyclohexanone solution was spin-coated to form a recording layer (3) with a thickness of 300 mm.
上記のようにして記録層を設けた基板を２枚、記８層が
内側になるようにして貼合わせ、エアーサンドイッチ構
造の光ディスクを作成した。Two substrates provided with recording layers as described above were bonded together with the 8th layer on the inside to produce an optical disk with an air sandwich structure.
比較例
上記実施例において、記録層■を記録層■と同じ材料で
塗布したこと以外は同様にしてエアーサンドインチ構造
の光ディスクを作成した。Comparative Example An optical disk having an air sand inch structure was prepared in the same manner as in the above Example except that the recording layer (1) was coated with the same material as the recording layer (2).
以上のようにして作成した２枚の光ディスクを光デイス
クドライブに装着し、線速２．１ｍ／ｓで回転させ、記
録レーザパワー４ｍ！７でデータ記録を行った後、読み
出しレーザパワー０．３１で３００万回繰り返し読み出
しを行い、ビットエラー率及びピット信号振幅を比較し
た。その結果を表−１に示す。The two optical discs created as described above were loaded into an optical disc drive, rotated at a linear velocity of 2.1 m/s, and the recording laser power was 4 m! After recording data in Step 7, reading was repeated 3 million times with a read laser power of 0.31, and the bit error rate and pit signal amplitude were compared. The results are shown in Table-1.
表−１
上記衣に示されるように、本発明の実施例による光ディ
スクの方が、比較例の光ディスクに比べ。Table 1 As shown in the above table, the optical disc according to the example of the present invention is better than the optical disc according to the comparative example.
優れた繰り返し読み出し能力を示す結果となった。The results showed excellent repeat reading ability.
以上詳細に説明したように、本発明によれば。 As described in detail above, according to the present invention.
記録層表面よりも記録層内部の方が相対的に光劣化速度
が速くなる如く層構成を行ったので、多量の光クエンチ
ング剤を混入した耐光性のよい（光劣化速度の遅い）記
＠層材料を用いることなく、データの繰り返し読み出し
特性を向上できる。そして多量の光クエンチング剤を記
＠層中に混入する必要がないので、光クエンチング剤の
混入による保存信頼性の低下、記録感度の低下が起きに
くい利点がある。The layer structure was designed so that the rate of photodegradation is relatively faster inside the recording layer than on the surface of the recording layer, so the recording layer contains a large amount of light quenching agent and has good light resistance (low rate of photodegradation). Data repeatability can be improved without using layered materials. Since it is not necessary to mix a large amount of a light quenching agent into the recording layer, there is an advantage that storage reliability and recording sensitivity are less likely to be lowered due to the mixing of a light quenching agent.
第１図は本発明に係る光記録媒体の構造例を示す断面図
、第２図は単層記録層を有する従来の光記録媒体の構成
を示す断面図、第３図は第２図の光記録媒体における繰
り返し読み出し回数と信号レベルの関係を示す図、第４
図は第１図の光記録媒体における繰り返し読み出し回数
と信号レベルの関係を示す図である。
ｌ・・・基板
２・・・記８層
３・・・記録Ｊｆｌ■
４・・・記録層■
５・・・記録ピット
Ａ・・未記録部
Ｂ・・ピッ１−記録部
第１図
特許出願人 株式会社 リ コ
第２図FIG. 1 is a cross-sectional view showing an example of the structure of an optical recording medium according to the present invention, FIG. 2 is a cross-sectional view showing the structure of a conventional optical recording medium having a single recording layer, and FIG. Diagram 4 showing the relationship between the number of repeated readings on a recording medium and the signal level.
This figure is a diagram showing the relationship between the number of repeated readings and the signal level in the optical recording medium of FIG. 1. l... Substrate 2... Recording layer 3... Recording Jfl ■ 4... Recording layer ■ 5... Recording pit A... Unrecorded area B... Pit 1 - Recording part Fig. 1 Patent Applicant Riko Co., Ltd. Figure 2
Claims (1)
さらに必要に応じて保護層を設けてなる光記録媒体にお
いて、 前記記録層が、記録層表面よりも記録層内部の方が相対
的に光劣化速度が速い層構成を有することを特徴とする
光記録媒体。(1) In an optical recording medium in which a recording layer is provided directly or via an undercoat layer on a substrate, and a protective layer is further provided as necessary, the recording layer is located more inside the recording layer than at the surface of the recording layer. An optical recording medium characterized by having a layer structure with a relatively fast photodegradation rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63147693A JPH023122A (en) | 1988-06-14 | 1988-06-14 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63147693A JPH023122A (en) | 1988-06-14 | 1988-06-14 | Optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH023122A true JPH023122A (en) | 1990-01-08 |
Family
ID=15436134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63147693A Pending JPH023122A (en) | 1988-06-14 | 1988-06-14 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH023122A (en) |
-
1988
- 1988-06-14 JP JP63147693A patent/JPH023122A/en active Pending
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