JPH02215588A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPH02215588A JPH02215588A JP1036566A JP3656689A JPH02215588A JP H02215588 A JPH02215588 A JP H02215588A JP 1036566 A JP1036566 A JP 1036566A JP 3656689 A JP3656689 A JP 3656689A JP H02215588 A JPH02215588 A JP H02215588A
- Authority
- JP
- Japan
- Prior art keywords
- recording layer
- recording medium
- optical recording
- organic dye
- disk
- 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 description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 9
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 8
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 32
- 238000000034 method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000011241 protective layer Substances 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 239000003381 stabilizer Substances 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 238000001782 photodegradation Methods 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 2
- 238000004528 spin coating Methods 0.000 abstract 2
- 239000000975 dye Substances 0.000 description 10
- 230000033458 reproduction Effects 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- QGKMIGUHVLGJBR-UHFFFAOYSA-M (4z)-1-(3-methylbutyl)-4-[[1-(3-methylbutyl)quinolin-1-ium-4-yl]methylidene]quinoline;iodide Chemical compound [I-].C12=CC=CC=C2N(CCC(C)C)C=CC1=CC1=CC=[N+](CCC(C)C)C2=CC=CC=C12 QGKMIGUHVLGJBR-UHFFFAOYSA-M 0.000 description 1
- JRNVQLOKVMWBFR-UHFFFAOYSA-N 1,2-benzenedithiol Chemical compound SC1=CC=CC=C1S JRNVQLOKVMWBFR-UHFFFAOYSA-N 0.000 description 1
- 229930192627 Naphthoquinone Natural products 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 150000004056 anthraquinones Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002791 naphthoquinones Chemical class 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 230000008832 photodamage Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 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】
（イ）産業上の利用分野
本発明は記録層に光を照射して熱変形を生じさせること
により情報の記録を成す光記録媒体に関するものである
。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an optical recording medium in which information is recorded by irradiating a recording layer with light to cause thermal deformation.
（ロ）従来の技術 近年、追記が可能な光ディスクが研究開発されている。(b) Conventional technology In recent years, write-once optical discs have been researched and developed.
この種の光ディスクには様々なものがあるが、その１つ
として光を照射した際の熱エネルギーにより記録層を部
分的に熱膨張させて情報の記録を行うものがある。斯か
るディスクでは、この熱膨張部分をその各々が夫々所定
の長さを有するようにディスク上に螺旋状に配列せしめ
て記録トラックを形成し、再生時には、この記録トラッ
クを再生ビームにより走査することにより、その反射光
のレベルによって情報の読取りを行う。記録層の上層に
は反射膜が形成されており、記録層の下層から入射され
た読取光は記録層を透過した後この反射膜にて反射され
る。この際、反射光のレベルは、反射光が前記各膨張部
分の間にある場合には比較的大きいが、反射光が各膨張
部分にある場合にはこの膨張部分にて光が散乱されるた
め小さいものとなる。従って、ディスクからの反射光は
、その強度が記録トラックによって略２値的にパルス状
に変化する。記録トラック上の熱膨張部分は、記録時に
おいてその長さが所望のデータを含む様に形成されてい
るため、前記ディスクからの反射光の強度もこのデータ
に応じてパルス状に変化することになる。再生部では、
この反射光をセンサにて受光することにより、斯様にデ
ータを含む光信号を電気信号に変換して、信号の再生を
行う。There are various kinds of optical discs of this kind, and one of them is one in which information is recorded by partially thermally expanding a recording layer by thermal energy when irradiated with light. In such a disk, a recording track is formed by arranging the thermal expansion portions in a spiral shape on the disk so that each part has a predetermined length, and during reproduction, this recording track is scanned by a reproduction beam. Information is read based on the level of the reflected light. A reflective film is formed on the upper layer of the recording layer, and the reading light incident from the lower layer of the recording layer is reflected by the reflective film after passing through the recording layer. At this time, the level of the reflected light is relatively large when the reflected light is between each of the expansion parts, but when the reflected light is at each expansion part, the light is scattered by the expansion parts. It becomes small. Therefore, the intensity of the reflected light from the disk changes approximately in a binary pulse shape depending on the recording track. Since the thermal expansion portion on the recording track is formed so that its length includes desired data during recording, the intensity of the reflected light from the disk also changes in a pulsed manner according to this data. Become. In the reproduction department,
By receiving this reflected light with a sensor, the optical signal containing data is converted into an electrical signal and the signal is reproduced.
此種に、この種ディスクでは、その再生が反射光のレベ
ルにより行われるものであるから、記録層に光透過率を
低下させるような劣下が生じると前記平坦部からの反射
光のレベルが熱膨張部分からの反射光のレベルに近づく
ため、各反射光の区別がつきにくくなる（Ｃ／Ｎの低下
）。従って、良好な再生が行われにくくなり、この様な
劣下が進むと、ついには再生が不能になることがある。In this type of disc, reproduction is performed based on the level of reflected light, so if the recording layer deteriorates to the point where the light transmittance is reduced, the level of reflected light from the flat area will decrease. Since the level approaches the level of the reflected light from the thermally expanding portion, it becomes difficult to distinguish each reflected light (a decrease in C/N). Therefore, it becomes difficult to perform good regeneration, and if such deterioration progresses, regeneration may eventually become impossible.
斯かる記録層の劣下は、記録層材料の酸化による変質、
あるいは再生光照射による分子崩壊等所定の化学反応に
より生じるものと考えられる。Such deterioration of the recording layer is caused by deterioration due to oxidation of the recording layer material,
Alternatively, it is thought to be caused by a predetermined chemical reaction such as molecular collapse due to irradiation with reproduction light.
尚、上記追記が可能な光ディスクとしては、例えば記録
層として有機色素材料を用いたものが研究開発されてい
る。当該ディスクにおいても、長時間放置による記録層
の劣下が認められ、更に、繰り返し再生による記録層の
劣下が認められた。Incidentally, as the above-mentioned write-once optical disc, for example, one using an organic dye material as a recording layer is being researched and developed. In this disc as well, deterioration of the recording layer was observed due to long-term storage, and further deterioration of the recording layer was observed due to repeated playback.
（ハ）発明が解決しようとする課題
本発明は、上述したところのディスクの寿命の低下を防
止することを課題とするものである。(c) Problems to be Solved by the Invention It is an object of the present invention to prevent the aforementioned decrease in the life of the disk.
（ニ）課題を解決するための手段
本発明は、記録層の化学反応を抑制する物質を記録層に
含有せしめたことを特徴とする。(d) Means for Solving the Problems The present invention is characterized in that the recording layer contains a substance that suppresses chemical reactions in the recording layer.
（ホ）作 用
記録層の化学反応が抑制されることにより記録層に生じ
る変質が抑制され、以って、放置等による記録層の光透
過率の減小速度が著しく遅延される。(E) Function: By suppressing the chemical reaction of the recording layer, deterioration of the recording layer is suppressed, and the rate of decrease in the light transmittance of the recording layer caused by leaving the recording layer or the like is thereby significantly delayed.
（へ）実施例 以下、本発明の一実施例に付き図面を用いて説明する。(f) Example Hereinafter, one embodiment of the present invention will be explained using the drawings.
第１図はディスクの断面を示す図である。図において、
（１）は透明プラスチック材料よりなる基板、（２）は
有機色素材料よりなる記録層、（３）はアルミニウムよ
りなる反射膜、（４）は紫外線硬化樹脂よりなる保護層
である。記録層（２）は有機色素材料を基板（１）上に
スピンコード法によって塗布した後これを乾燥するこ、
とにより形成される。反射膜（３）は記録層（２）の上
にアルミニウムを蒸着あるいはスパッタリングすること
により形成される。保護層（４）は反射膜（３）上に紫
外線硬化樹脂をスピンコード法により塗布し、その後紫
外線を照射してこの樹脂を硬化させることにより形成さ
れる。FIG. 1 is a diagram showing a cross section of the disk. In the figure,
(1) is a substrate made of a transparent plastic material, (2) is a recording layer made of an organic dye material, (3) is a reflective film made of aluminum, and (4) is a protective layer made of an ultraviolet curing resin. The recording layer (2) is formed by applying an organic dye material onto the substrate (1) by a spin code method and then drying it.
It is formed by The reflective film (3) is formed by depositing or sputtering aluminum on the recording layer (2). The protective layer (4) is formed by applying an ultraviolet curing resin on the reflective film (3) by a spin-coding method, and then curing the resin by irradiating ultraviolet rays.
次に、斯かるディスクの形状寸法及び材質を特定した場
合の実験結果を第２図及び第３図に示しこれについて説
明する。ディスクの形状寸法及び材質は以下に示す表１
の通りである。Next, the experimental results obtained when the shape and dimensions and material of such a disk were specified are shown in FIGS. 2 and 3 and will be explained. The dimensions and materials of the disc are shown in Table 1 below.
It is as follows.
以下余白
表 １
尚、各実施例の記録層（Ａ、Ｂ）としては、シアニン色
素（有機色素）酸化防止剤、及びニトロセルロース（溶
媒）を１００：３：１５０の比率にて混ぜ合わせたもの
が用いられており、この内実施例１では酸化防止剤とし
てフェノール類のもの（商品名：ｓｕｍｉｌｉｚｅｒ
ＧＡ−８０）が又実施例２では酸化防止剤としてアミ
ン類のもの（商品名：ｓｕｍｉｓｏｒｂ ＴＭ−０６
１）が用いられている。比較例としては、酸化防止剤が
記録層に含有されていない以外は、上記の材質及び形状
寸法と同一のディスクが用いられている。The following is a margin table: 1 The recording layers (A, B) of each example were made by mixing cyanine dye (organic dye), antioxidant, and nitrocellulose (solvent) in a ratio of 100:3:150. Among them, in Example 1, phenols (product name: Sumilizer) were used as antioxidants.
GA-80), and in Example 2, an amine (product name: sumisorb TM-06) was used as an antioxidant.
1) is used. As a comparative example, a disk having the same material and shape as above was used except that the recording layer did not contain an antioxidant.
第２図はこれら各ディスクを放置した場合のディスクの
反射率の放置時間に対する変化を示したものである。尚
、斯かる反射率はレーザ光をディスク面に照射し、その
入射光のパワーと反射光のパワーの比率を計算して求め
ている。又、ディスクは、気温６０℃、相対湿度９０％
ＲＨの環境下へおかれており、一定時間経過毎に上記方
法により反射率が計測されている。FIG. 2 shows the change in the reflectance of each of these disks with respect to the standing time. The reflectance is determined by irradiating the disk surface with laser light and calculating the ratio of the power of the incident light to the power of the reflected light. In addition, the disc is stored at a temperature of 60°C and a relative humidity of 90%.
It is placed in an RH environment, and the reflectance is measured by the above method every certain period of time.
図示の如く、比較例１では放置時間が１００時間を越え
ると徐々にディスクの反射率が低下するのに対し、実施
例１及び２では放置時間が１００００時間を越えてもデ
ィスクの反射率が低下しない。As shown in the figure, in Comparative Example 1, the reflectance of the disk gradually decreases when the standing time exceeds 100 hours, whereas in Examples 1 and 2, the reflectance of the disk decreases even after the standing time exceeds 10,000 hours. do not.
第３図は読出し光のパワーに対するディスクの繰返し再
生の寿命の実験結果をグラフに表したものである。繰返
し再生の寿命（繰返し再生が可能な回数）は、波長８３
０ｎｍのレーザ光をｌｕｍ径のスポットに集光した記録
ビームを用いてディスクに１トラツク（同心円状）だけ
所定の情報を記録し、これを前記読出し光を用いて線速
度一定（１，３ｍ／ｓ）にて繰返し走査した際に、その
読取り光のＣ／Ｎが所定のレベルを下回ったときの走査
回数により設定している。FIG. 3 is a graph showing the experimental results of the repeated playback life of the disk versus the power of the readout light. The lifespan of repeated playback (the number of times that repeatable playback is possible) is at wavelength 83.
Predetermined information is recorded on the disk by one track (concentrically) using a recording beam made by concentrating a 0 nm laser beam onto a spot with a lum diameter, and this is recorded at a constant linear velocity (1.3 m/cm) using the readout beam. It is set based on the number of scans when the C/N of the reading light falls below a predetermined level when repeatedly scanning in step s).
第３図に示す実験結果によれば、各実施例及び従来例と
も読取りビームのパワーが大きくなるほど繰り返し再生
の寿命が小さくなっているが、その減小の程度は従来例
に比べ各実施例が著しく小さく、更に各実施例において
は読出しパワーが０．６ｍｗ以上になると、再生の寿命
が２０万回程度に収束する傾向にある。従って、本実施
例によれば、２０万回以上の再生に対しても再生するに
十分なＣ／Ｎを得ることができ、以ってディスクの寿命
を著しく向上させることができることが認められた。According to the experimental results shown in FIG. 3, the lifetime of repeated reproduction becomes shorter as the power of the reading beam increases in both the embodiments and the conventional example, but the degree of reduction is smaller in each embodiment than in the conventional example. It is extremely small, and furthermore, in each example, when the read power becomes 0.6 mw or more, the reproduction life tends to converge to about 200,000 times. Therefore, according to this example, it was possible to obtain a C/N sufficient for reproduction even after 200,000 reproductions, and it was therefore confirmed that the life of the disc could be significantly improved. .
以上のように本実施例では従来例に比べ著しい効果を奏
することができたが、これらの効果は記録層に含有せし
めた酸化防止剤が、有機色素の構成体の分解あるいは構
成体への他物質（例えば酸素）の結合を抑制する安定化
剤としても作用し、これにより有機色素の酸化あるいは
有機色素の光崩壊が抑制されたためであると考えられる
。As described above, this example was able to achieve remarkable effects compared to the conventional example, but these effects are due to the fact that the antioxidant contained in the recording layer causes decomposition of the constituents of the organic dye or other effects on the constituents. This is thought to be because it also acts as a stabilizer that suppresses the binding of substances (eg, oxygen), thereby suppressing oxidation of organic dyes or photodegradation of organic dyes.
尚、酸化防止剤は、一般に有機物に対して安定化剤とし
て作用する性質を有するものであるから本発明に用いら
れる酸化防止剤としては上記実施例において述べたもの
に限定されず、他に種々の酸化防止剤が使用できる。ま
た、有機色素材料及びこれを溶かす溶媒も上記実施例に
限定されず、他に種々の変更が可能である。例えば他の
有機色素材料としてはスクアリウム類、フタロシリアニ
ン類、ボフィリン類、チオインジコ類、アントラキノン
類、ナフトキノン類、ベンゼンジチオールＮｉ錯体類等
がある。In addition, since antioxidants generally have the property of acting as a stabilizer for organic substances, the antioxidants used in the present invention are not limited to those described in the above examples, and various other antioxidants may be used. Antioxidants can be used. Further, the organic dye material and the solvent in which it is dissolved are not limited to the above embodiments, and various other changes are possible. For example, other organic dye materials include squaliums, phthalocyanines, bofilins, thioindicos, anthraquinones, naphthoquinones, benzenedithiol Ni complexes, and the like.
（ト）発明の効果
以上、本発明によれば、記録層の自然劣下或いは光力下
を防止でき、以ってディスクの寿命を従来例に比べて大
幅に引伸ばすことができる。(g) Effects of the Invention As described above, according to the present invention, it is possible to prevent natural deterioration of the recording layer or damage caused by light damage, and thus the life of the disc can be significantly extended compared to the conventional example.
第１図は本発明の一実施例に係るディスクの断面図、第
２図及び第３図は実施例と従来例とを比較した実験結果
を示すグラフである。
（１）・・・基板、（２）・・・記録層、（３）・・・
反射膜、（４）・・・保護層。FIG. 1 is a sectional view of a disk according to an embodiment of the present invention, and FIGS. 2 and 3 are graphs showing experimental results comparing the embodiment and a conventional example. (1)...Substrate, (2)...Recording layer, (3)...
Reflective film, (4)...protective layer.
Claims (1)
よって情報を記録する光記録媒体であって、前記記録層
に該記録層の化学変化を抑制する物質を含有せしめたこ
とを特徴とする光記録媒体。 （２）記録層は有機色素材料を含むことを特徴とする請
求項（１）に記載の光記録媒体。（３）化学変化を抑制
する物質は酸化防止剤であることを特徴とする請求項（
１）または（２）に記載の光記録媒体。 （４）酸化防止剤としてフェノール類のものを用いたこ
とを特徴とする請求項（３）に記載の光記録媒体。 （５）酸化防止剤としてアミン類のものを用いたことを
特徴とする請求項（３）に記載の光記録媒体。[Scope of Claims] (1) An optical recording medium that records information by irradiating a recording layer with light to cause thermal deformation, the recording layer containing a substance that suppresses chemical changes in the recording layer. An optical recording medium characterized by containing: (2) The optical recording medium according to claim (1), wherein the recording layer contains an organic dye material. (3) A claim characterized in that the substance that suppresses chemical change is an antioxidant (
The optical recording medium according to 1) or (2). (4) The optical recording medium according to claim (3), wherein a phenol is used as the antioxidant. (5) The optical recording medium according to claim (3), wherein an amine is used as the antioxidant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1036566A JPH02215588A (en) | 1989-02-16 | 1989-02-16 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1036566A JPH02215588A (en) | 1989-02-16 | 1989-02-16 | Optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02215588A true JPH02215588A (en) | 1990-08-28 |
Family
ID=12473312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1036566A Pending JPH02215588A (en) | 1989-02-16 | 1989-02-16 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02215588A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000054264A1 (en) * | 1999-03-05 | 2000-09-14 | Vivastar Materials Ag | Recording medium for optical data storage devices, method for producing said recording medium and optical data storage device with a corresponding recording layer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60204396A (en) * | 1984-03-29 | 1985-10-15 | Tdk Corp | Optical recording medium |
| JPS60205841A (en) * | 1984-03-30 | 1985-10-17 | Tdk Corp | Optical recording medium |
-
1989
- 1989-02-16 JP JP1036566A patent/JPH02215588A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60204396A (en) * | 1984-03-29 | 1985-10-15 | Tdk Corp | Optical recording medium |
| JPS60205841A (en) * | 1984-03-30 | 1985-10-17 | Tdk Corp | Optical recording medium |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000054264A1 (en) * | 1999-03-05 | 2000-09-14 | Vivastar Materials Ag | Recording medium for optical data storage devices, method for producing said recording medium and optical data storage device with a corresponding recording layer |
| WO2000054263A1 (en) * | 1999-03-05 | 2000-09-14 | Vivastar Materials Ag | Recording layer for optical data storage devices |
| EP1209673A1 (en) * | 1999-03-05 | 2002-05-29 | Vivastar Materials AG | Recording layer for optical data storage devices |
| EP1209672A1 (en) * | 1999-03-05 | 2002-05-29 | Vivastar Mastering AG | Recording layer for optical data storage devices |
| EP1209674A1 (en) * | 1999-03-05 | 2002-05-29 | Vivastar Materials AG | Recording layer for optical storage devices |
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