JP3834053B2 - Optical recording medium - Google Patents
Optical recording medium Download PDFInfo
- Publication number
- JP3834053B2 JP3834053B2 JP2005254831A JP2005254831A JP3834053B2 JP 3834053 B2 JP3834053 B2 JP 3834053B2 JP 2005254831 A JP2005254831 A JP 2005254831A JP 2005254831 A JP2005254831 A JP 2005254831A JP 3834053 B2 JP3834053 B2 JP 3834053B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- ring
- substituent
- optical recording
- recording 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.)
- Expired - Fee Related
Links
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- 125000003118 aryl group Chemical group 0.000 claims description 6
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- 125000004122 cyclic group Chemical group 0.000 claims description 5
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Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
この発明は光記録媒体に関するものである。 The present invention relates to an optical recording medium.
マルチメディア時代の到来に伴い、CD−R(コンパクトディスクを利用する追記型メモリ)やDVD−R(デジタルビデオディスクを利用する追記型メモリ)などの光記録媒体が脚光を浴びている。光記録媒体は、テルル、セレン、ロジウム、炭素、硫化水素などの無機物を用いて記録層を構成する無機系光記録媒体と、有機色素化合物を主体とする光吸収剤により記録層を構成する有機系光記録媒体に大別することができる。 With the advent of the multimedia era, optical recording media such as CD-R (write-once memory using a compact disk) and DVD-R (write-once memory using a digital video disk) are in the spotlight. The optical recording medium is composed of an inorganic optical recording medium comprising a recording layer using an inorganic substance such as tellurium, selenium, rhodium, carbon, hydrogen sulfide, and an organic constituting the recording layer by a light absorber mainly composed of an organic dye compound. The optical recording medium can be broadly classified.
このうち、有機系光記録媒体は、通常、ポリメチン系色素をはじめとする有機色素化合物を2,2,3,3−テトラフルオロ−1−プロパノール(以下、「TFP」と略記する。)などの有機溶剤に溶解し、溶液をポリカーボネート製の基板に塗布し、乾燥して記録層を形成した後、金、銀、銅などの金属による反射層及び紫外線硬化樹脂などによる保護層を順次密着させて形成することによって作製される。有機系光記録媒体は、無機系のものと比較して、読取光や自然光などの環境光によって記録層が変化し易いという欠点はあるものの、光吸収剤を溶液にして直接基板に塗布することによって記録層を構成し得ることから、光記録媒体を廉価に作製できる利点がある。加えて、有機系光記録媒体は、有機物を主体に構成されるので、湿気や海水にさらされる環境下でも腐食し難い利点があることと、有機熱変形型光記録媒体の出現によって、所定のフォーマットで光記録媒体に記録された情報を市販の読取専用装置を用いて読み取れるようになったことから、今や廉価な光記録媒体の主流になりつつある。 Among these, the organic optical recording medium is usually an organic dye compound such as a polymethine dye such as 2,2,3,3-tetrafluoro-1-propanol (hereinafter abbreviated as “TFP”). After dissolving in an organic solvent, applying the solution to a polycarbonate substrate and drying to form a recording layer, a reflective layer made of a metal such as gold, silver, copper, etc. It is produced by forming. Compared to inorganic media, organic optical recording media have the disadvantage that the recording layer is easily changed by ambient light such as reading light or natural light, but the light absorber is applied directly to the substrate as a solution. Thus, the recording layer can be configured, so that there is an advantage that an optical recording medium can be manufactured at a low cost. In addition, since the organic optical recording medium is mainly composed of an organic substance, it has an advantage that it is difficult to corrode even in an environment exposed to moisture or seawater, and the appearance of an organic heat-deformable optical recording medium has a predetermined value. Since information recorded in an optical recording medium in a format can be read using a commercially available read-only device, it is now becoming the mainstream of inexpensive optical recording media.
有機系光記録媒体における緊急の課題は、マルチメディア時代に対応するためのさらなる高密度化である。現在、斯界において鋭意推進されている高密度化の研究は、主として、情報の書込に用いるレーザー光の波長をGaAlAs系半導体レーザーによる現行の775乃至795nmから660nm以下に短波長化することによって、片面当りの記録容量を4.7GB以上に増大することを目指している。しかしながら、例えば、CD−Rに代わる高密度光記録媒体として期待されているDVD−Rにおいては、書込光として波長660nm以下のレーザー光を用いることが提唱されているところ、CD−R用として開発された有機色素化合物は、その多くが吸収極大の長波長側で斯かる書込光を実質的に吸収し得ないことから、DVD−Rに用いると、情報を適切に書き込んだり読み取ったりできないと考えられてきた。そのため、斯界においては、目下、吸収極大の長波長側で波長660nm以下の可視光を実質的に吸収する多種多様の有機色素化合物が鋭意試作され、DVD−Rにおける光特性が試験されている。ところが、有機色素化合物を新たに分子設計するとなると、光特性や安定性の試験に加えて、有機色素化合物そのものを製造する方法を確立するために多大のコストと労力を費やすこととなる。 An urgent problem in the organic optical recording medium is further densification to cope with the multimedia era. At present, the research on high density that is actively promoted in this field is mainly by shortening the wavelength of the laser beam used for writing information from the current 775 to 795 nm to 660 nm or less by the GaAlAs semiconductor laser, It aims to increase the recording capacity per side to 4.7 GB or more. However, for example, in DVD-R, which is expected as a high-density optical recording medium to replace CD-R, it is proposed to use laser light with a wavelength of 660 nm or less as writing light. Many of the developed organic dye compounds cannot substantially absorb such writing light on the long wavelength side of the absorption maximum, so when used for DVD-R, information cannot be properly written or read. Has been considered. Therefore, in this field, a wide variety of organic dye compounds that substantially absorb visible light having a wavelength of 660 nm or less on the long wavelength side of the absorption maximum have been experimentally produced and optical characteristics of DVD-R are being tested. However, when a new molecular design of an organic dye compound is made, a great deal of cost and labor are required to establish a method for producing the organic dye compound itself, in addition to tests for optical properties and stability.
以上説明したとおり、この発明は、従来、光記録媒体へ適用できないと考えられていた有機色素化合物であっても、吸収極大の短波長側で書込光を実質的に吸収するものは、光記録媒体の基板にピットを形成する主体となる光吸収剤として極めて有利に用い得るという独自の知見に基づくものである。この発明は、従来、光記録媒体へ適用できないと考えられていた有機色素化合物の潜在的用途を発掘し、もって、光記録媒体、とりわけ、波長700nm以下の書込光を用いる高密度光記録媒体を作製するに当って、基板にピットを形成する主体となる有機色素化合物の選択肢を大幅に広げるものである。 As described above, the present invention is an organic dye compound that is conventionally considered to be inapplicable to an optical recording medium, but substantially absorbs writing light on the short wavelength side of the absorption maximum. This is based on a unique finding that it can be used very advantageously as a light absorber that is a main component of forming pits on a substrate of a recording medium. The present invention uncovers the potential uses of organic dye compounds that were conventionally considered to be inapplicable to optical recording media, and therefore, optical recording media, and in particular, high-density optical recording media using writing light having a wavelength of 700 nm or less. In this case, the choice of the organic dye compound that mainly forms pits on the substrate is greatly expanded.
斯かる状況に鑑み、この発明の課題は、従来、光記録媒体へ適用できないと考えられていた有機色素化合物の潜在的用途を発掘し、もって、光記録媒体を作製する際に用いる有機色素化合物の選択肢を広げることを課題とする。 In view of such circumstances, the object of the present invention is to discover potential uses of organic dye compounds that have been conventionally considered to be inapplicable to optical recording media, and thus organic dye compounds used in producing optical recording media The challenge is to expand the options.
本発明者が鋭意研究したところ、従来、光記録媒体へ適用できないと考えられていた有機色素化合物であっても、吸収極大の短波長側で書込光を実質的に吸収するものは、光記録媒体の基板にピットを形成する主体となる光吸収剤として極めて有用であることを見出した。 As a result of diligent research by the present inventors, even organic dye compounds that were conventionally considered to be inapplicable to optical recording media are those that substantially absorb writing light on the short wavelength side of the absorption maximum. The present inventors have found that the present invention is extremely useful as a light absorber that mainly forms pits on a substrate of a recording medium.
すなわち、この発明は、前述の課題を、基板と、有機色素化合物を用いてその基板上に設けられた記録層とを含んでなり、その記録層へ書込光を照射し、有機色素化合物をして基板にピットを形成せしめることによって情報を記録する光記録媒体において、その有機色素化合物の吸収極大が書込光の波長より長波長にある光記録媒体を提供することによって解決するものである。 That is, this invention includes the above-described problem, comprising a substrate and a recording layer provided on the substrate using an organic dye compound, and irradiating the recording layer with writing light to In the optical recording medium for recording information by forming pits on the substrate, the problem is solved by providing an optical recording medium in which the absorption maximum of the organic dye compound is longer than the wavelength of the writing light. .
さらに、この発明は、前述の課題を、基板と、有機色素化合物を用いてその基板上に設けられた記録層とを含んでなり、その記録層へ書込光を照射し、有機色素化合物をして基板にピットを形成せしめることによって情報を記録する光記録方法において、ピットを形成する主体となる有機色素化合物として、吸収極大の短波長側で書込光を実質的に吸収する有機色素化合物を用い、その吸収極大の波長より短波長の書込光を照射して基板にピットを形成する光記録方法を提供することによって解決するものである。 Furthermore, the present invention provides the above-described problem by including a substrate and a recording layer provided on the substrate using an organic dye compound, and irradiating the recording layer with writing light, In an optical recording method for recording information by forming pits on a substrate, an organic dye compound that substantially absorbs writing light on the short wavelength side of the absorption maximum as an organic dye compound that mainly forms pits This is solved by providing an optical recording method in which pits are formed on a substrate by irradiating writing light having a wavelength shorter than the absorption maximum wavelength.
さらに、この発明は、前述の課題を、斯かる光記録媒体及び光記録方法に用いる有機色素化合物を提供することによって解決するものである。 Furthermore, this invention solves the above-mentioned subject by providing the organic pigment | dye compound used for such an optical recording medium and an optical recording method.
この発明の実施の形態について説明すると、この発明でいう有機色素化合物とは、分子内に可視光を吸収する原子団を有する有機化合物全般を意味し、斯かる有機色素化合物は原子同士が共有結合のみによって結合してなるものであっても、共有結合と、例えば、イオン結合、配位結合などの非共有結合とを介して結合してなるものであってもよい。この発明においては、斯かる要件を充足する有機色素化合物であって、かつ、吸収極大の短波長側で書込光を実質的に吸収するものであるかぎり、特定の化学構造や調製方法のものに限定されることなく、極めて有利に用いることができる。なお、この発明でいう吸収極大とは、特に断らないかぎり、薄膜状態における吸収極大を指すものとする。 The embodiment of the present invention will be described. The organic dye compound in the present invention means all organic compounds having an atomic group that absorbs visible light in the molecule, and the organic dye compound has a covalent bond between atoms. Even if it couple | bonds by only, it may couple | bond together through a covalent bond and noncovalent bonds, such as an ionic bond and a coordination bond, for example. In this invention, as long as it is an organic dye compound that satisfies such requirements and that substantially absorbs writing light on the short wavelength side of the absorption maximum, it has a specific chemical structure or preparation method. However, the present invention can be used very advantageously. Note that the absorption maximum in the present invention refers to the absorption maximum in a thin film state unless otherwise specified.
この発明で用いる有機色素化合物としては、置換基を1又は複数有することあるモノメチン鎖又はジメチン鎖、トリメチン鎖、テトラメチン鎖、ペンタメチン鎖、ヘキサメチン鎖、ヘプタメチン鎖などのポリメチン鎖の両端に置換基を1又は複数有することある、互いに同じか異なるイミダゾリン環、イミダゾール環、ベンゾイミダソール環、α−ナフトイミダゾール環、β−ナフトイミダゾール環、インドール環、イソインドール環、インドレニン環、イソインドレニン環、ベンゾインドレニン環、ピリジノインドレニン環、オキサゾリン環、オキサゾール環、イソオキサゾール環、ベンゾオキサゾール環、ピリジノオキサゾール環、α−ナフトオキサゾール環、β−ナフトオキサゾール環、セレナゾリン環、セレナゾール環、ベンゾセレナゾール環、α−ナフトセレナゾール環、β−ナフトセレナゾール環、チアゾリン環、チアゾール環、イソチアゾール環、ベンゾチアゾール環、α−ナフトチアゾール環、β−ナフトチアゾール環、テルラゾリン環、テルラゾール環、ベンゾテルラゾール環、α−ナフトテルラゾール環、β−ナフトテルラゾール環、さらには、アクリジン環、アントラセン環、イソキノリン環、イソピロール環、イミダノキサリン環、インダンジオン環、インダゾール環、インダリン環、オキサジアゾール環、カルバゾール環、キサンテン環、キナゾリン環、キノキサリン環、キノリン環、クロマン環、シクロヘキサンジオン環、シクロペンタンジオン環、シンノリン環、チオジアゾール環、チオオキサゾリドン環、チオフェン環、チオナフテン環、チオバルビツール酸環、チオヒダントイン環、テトラゾール環、トリアジン環、ナフタレン環、ナフチリジン環、ピペラジン環、ピラジン環、ピラゾール環、ピラゾリン環、ピラゾリジン環、ピラゾロン環、ピラン環、ピリジン環、ピリダジン環、ピリミジン環、ピリリウム環、ピロリジン環、ピロリン環、ピロール環、フェナジン環、フェナントリジン環、フェナントレン環、フェナントロリン環、フタラジン環、プテリジン環、フラザン環、フラン環、プリン環、ベンゼン環、ベンゾオキサジン環、ベンゾピラン環、モルホリン環、ロダニン環などの環状核が結合してなるシアニン色素、メロシアニン色素、オキソノール色素、アズレニウム色素、スクアリリウム色素、ピリリウム色素、チオピリリウム色素、フェナントレン色素などのポリメチン系色素に加えて、アクリジン系、アザアヌレン系、アゾ金属錯体系、アントラキノン系、インジゴ系、インダンスレン系、オキサジン系、キサンテン系、ジオキサジン系、チアジン系、チオインジゴ系、テトラピラポルフィラジン系、トリフェニルメタン系、トリフェノチアジン系、ナフトキノン系、フタロシアニン系、ベンゾキノン系、ベンゾピラン系、ベンゾフラノン系、ポルフィリン系、ローダミン系の色素を挙げることができる。 The organic dye compound used in the present invention has one or more substituents at both ends of a polymethine chain such as a monomethine chain or dimethine chain, trimethine chain, tetramethine chain, pentamethine chain, hexamethine chain, and heptamethine chain which may have one or more substituents. Or an imidazoline ring, an imidazole ring, a benzimidazole ring, an α-naphthimidazole ring, a β-naphthimidazole ring, an indole ring, an isoindole ring, an indolenine ring, an isoindolenin ring, Benzoindolenin ring, pyridinoindolenin ring, oxazoline ring, oxazole ring, isoxazole ring, benzoxazole ring, pyridinooxazole ring, α-naphthoxazole ring, β-naphthoxazole ring, selenazoline ring, selenazole ring, benzoselena Ring, α-naphthselenazole ring, β-naphthselenazole ring, thiazoline ring, thiazole ring, isothiazole ring, benzothiazole ring, α-naphthothiazole ring, β-naphthothiazole ring, tellrazoline ring, tellurazole ring, Benzotelrazole ring, α-naphthotelrazole ring, β-naphthotelrazole ring, acridine ring, anthracene ring, isoquinoline ring, isopyrrole ring, imidanoxaline ring, indandione ring, indazole ring, indarin ring, oxadiazole Ring, carbazole ring, xanthene ring, quinazoline ring, quinoxaline ring, quinoline ring, chroman ring, cyclohexanedione ring, cyclopentanedione ring, cinnoline ring, thiodiazole ring, thiooxazolidone ring, thiophene ring, thionaphthene ring, thiobarbitu Luric acid ring, thiohydantoin ring, tetrazole ring, triazine ring, naphthalene ring, naphthyridine ring, piperazine ring, pyrazine ring, pyrazole ring, pyrazoline ring, pyrazolidine ring, pyrazolone ring, pyran ring, pyridine ring, pyridazine ring, pyrimidine ring, Pyrylium ring, pyrrolidine ring, pyrroline ring, pyrrole ring, phenazine ring, phenanthridine ring, phenanthrene ring, phenanthroline ring, phthalazine ring, pteridine ring, furazane ring, furan ring, purine ring, benzene ring, benzoxazine ring, benzopyran ring Polymethine colors such as cyanine dyes, merocyanine dyes, oxonol dyes, azulenium dyes, squarylium dyes, pyrylium dyes, thiopyrylium dyes, phenanthrene dyes, which are formed by bonding of cyclic nuclei such as morpholine and rhodanine rings In addition to acridine, azaannulene, azo metal complex, anthraquinone, indigo, indanthrene, oxazine, xanthene, dioxazine, thiazine, thioindigo, tetrapyraporphyrazine, triphenylmethane And dyes based on triphenothiazine, naphthoquinone, phthalocyanine, benzoquinone, benzopyran, benzofuranone, porphyrin, and rhodamine.
特に望ましい有機色素化合物は、一般式1乃至一般式3のいずれかで表されるシアニン色素若しくはスチリル色素又はアゾ化合物の金属錯体であって、波長850nmより短波長に吸収極大を有し、光記録媒体に用いると、その吸収極大の短波長側において波長700nm以下の書込光、とりわけ、波長390乃至450nm又は波長630乃至680nmの範囲の書込光を実質的に吸収するものである。 A particularly desirable organic dye compound is a metal complex of a cyanine dye, a styryl dye or an azo compound represented by any one of the general formulas 1 to 3, having an absorption maximum at a wavelength shorter than 850 nm, and optical recording. When used as a medium, it substantially absorbs writing light having a wavelength of 700 nm or less, particularly writing light having a wavelength of 390 to 450 nm or wavelengths of 630 to 680 nm on the short wavelength side of the absorption maximum.
一般式1及び一般式2を通じて、Z1乃至Z3は、例えば、ベンゼン環、ナフタレン環、ピリジン環、キノリン環、キノキサリン環などの芳香環を表し、それらの芳香環は置換基を1又は複数有していてもよい。置換基の例としては、例えば、メチル基、トリフルオロメチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、sec−ブチル基、tert−ブチル基、ペンチル基、イソペンチル基、ネオペンチル基、tert−ペンチル基、1−メチルペンチル基、2−メチルペンチル基、ヘキシル基、イソヘキシル基、5−メチルヘキシル基、ヘプチル基、オクチル基などの脂肪族炭化水素基、シクロプロピル基、シクロブチル基、シクロペンチル基、シクロヘキシル基などの脂環式炭化水素基、フェニル基、ビフェニリル基、o−トリル基、m−トリル基、p−トリル基、キシリル基、メシチル基、o−クメニル基、m−クメニル基、p−クメニル基などの芳香族炭化水素基、メトキシ基、トリフルオロメトキシ基、エトキシ基、プロポキシ基、イソプロポキシ基、ブトキシ基、sec−ブトキシ基、tert−ブトキシ基、ペンチルオキシ基、フェノキシ基、ベンゾイルオキシ基などのエーテル基、メトキシカルボニル基、トリフルオロメトキシカルボニル基、エトキシカルボニル基、プロポキシカルボニル基、アセトキシ基、ベンゾイルオキシ基などのエステル基、フルオロ基、クロロ基、ブロモ基、ヨード基などのハロゲン基、メチルチオ基、エチルチオ基、プロピルチオ基、ブチルチオ基、フェニルチオ基などのチオ基、メチルスルファモイル基、ジメチルスルファモイル基、エチルスルファモイル基、ジエチルスルファモイル基、プロピルスルファモイル基、ジプロピルスルファモイル基、ブチルスルファモイル基、ジブチルスルファモイル基などのスルファモイル基、第一級アミノ基、メチルアミノ基、ジメチルアミノ基、エチルアミノ基、ジエチルアミノ基、プロピルアミノ基、ジプロピルアミノ基、イソプロピルアミノ基、ジイソプロピルアミノ基、ブチルアミノ基、ジブチルアミノ基、ピペリジノ基などのアミノ基、メチルカルバモイル基、ジメチルカルバモイル基、エチルカルバモイル基、ジエチルカルバモイル基、プロピルカルバモイル基、ジプロピルカルバモイル基などのカルバモイル基、さらには、ヒドロキシ基、カルボキシ基、シアノ基、ニトロ基、スルフィノ基、スルホ基、メシル基などが挙げられる。なお、一般式1において、Z1及びZ2は互いに同じものであっても異なるものであってもよい。 Through the general formulas 1 and 2, Z1 to Z3 represent aromatic rings such as benzene ring, naphthalene ring, pyridine ring, quinoline ring, quinoxaline ring, etc., and these aromatic rings have one or more substituents. It may be. Examples of the substituent include, for example, methyl group, trifluoromethyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, isopentyl group, and neopentyl group. , Tert-pentyl group, 1-methylpentyl group, 2-methylpentyl group, hexyl group, isohexyl group, 5-methylhexyl group, heptyl group, octyl group and other aliphatic hydrocarbon groups, cyclopropyl group, cyclobutyl group, Cyclopentyl group, cyclohexyl group and other alicyclic hydrocarbon groups, phenyl group, biphenylyl group, o-tolyl group, m-tolyl group, p-tolyl group, xylyl group, mesityl group, o-cumenyl group, m-cumenyl group , Aromatic hydrocarbon group such as p-cumenyl group, methoxy group, trifluoromethoxy group, ethoxy , Propoxy group, isopropoxy group, butoxy group, sec-butoxy group, tert-butoxy group, pentyloxy group, phenoxy group, benzoyloxy group and other ether groups, methoxycarbonyl group, trifluoromethoxycarbonyl group, ethoxycarbonyl group, Ester groups such as propoxycarbonyl group, acetoxy group, benzoyloxy group, halogen groups such as fluoro group, chloro group, bromo group, iodo group, thio groups such as methylthio group, ethylthio group, propylthio group, butylthio group, phenylthio group, Sulfides such as methylsulfamoyl, dimethylsulfamoyl, ethylsulfamoyl, diethylsulfamoyl, propylsulfamoyl, dipropylsulfamoyl, butylsulfamoyl, and dibutylsulfamoyl Amoyl group, primary amino group, methylamino group, dimethylamino group, ethylamino group, diethylamino group, propylamino group, dipropylamino group, isopropylamino group, diisopropylamino group, butylamino group, dibutylamino group, piperidino Group such as amino group, methylcarbamoyl group, dimethylcarbamoyl group, ethylcarbamoyl group, diethylcarbamoyl group, propylcarbamoyl group, dipropylcarbamoyl group and the like, and further, hydroxy group, carboxy group, cyano group, nitro group, A sulfino group, a sulfo group, a mesyl group, etc. are mentioned. In the general formula 1, Z 1 and Z 2 may be the same or different from each other.
一般式1及び一般式2におけるY1乃至Y3は炭素原子又はヘテロ原子を表し、ヘテロ原子の例としては、例えば、窒素原子、酸素原子、硫黄原子、セレン原子、テルル原子などの周期律表における第15族及び第16族の原子が挙げられる。なお、Y1乃至Y3における炭素原子は、例えば、エチレン基やビニレン基などの2個の炭素原子を主体とする原子団であってもよい。また、一般式1におけるY1及びY2は互いに同じものであっても異なるものであってもよい。 Y 1 to Y 3 in General Formula 1 and General Formula 2 represent a carbon atom or a hetero atom. Examples of the hetero atom include a periodic table such as a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom. And group 15 and group 16 atoms. The carbon atom in Y 1 to Y 3 may be an atomic group mainly composed of two carbon atoms such as ethylene group and vinylene group. Y 1 and Y 2 in general formula 1 may be the same or different from each other.
一般式1及び一般式2におけるR1及びR2並びにR7乃至R9は脂肪族炭化水素基を表す。脂肪族炭化水素基の例としては、例えば、メチル基、エチル基、プロピル基、イソプロピル基、イソプロペニル基、1−プロペニル基、2−プロペニル基、ブチル基、イソブチル基、sec−ブチル基、tert−ブチル基、2−ブテニル基、1,3−ブタジエニル基、ペンチル基、イソペンチル基、ネオペンチル基、tert−ペンチル基、1−メチルペンチル基、2−メチルペンチル基、2−ペンテニル基、ヘキシル基、イソヘキシル基、5−メチルヘキシル基、ヘプチル基、オクチル基などが挙げられ、斯かる脂肪族炭化水素基はZ1乃至Z3におけると同様の置換基を1又は複数有していてもよい。なお、一般式1におけるR1及びR2並びに一般式2におけるR7乃至R9は、それぞれ、互いに同じものであっても異なるものであってもよい。 In the general formulas 1 and 2, R 1 and R 2 and R 7 to R 9 represent an aliphatic hydrocarbon group. Examples of aliphatic hydrocarbon groups include, for example, methyl, ethyl, propyl, isopropyl, isopropenyl, 1-propenyl, 2-propenyl, butyl, isobutyl, sec-butyl, tert -Butyl group, 2-butenyl group, 1,3-butadienyl group, pentyl group, isopentyl group, neopentyl group, tert-pentyl group, 1-methylpentyl group, 2-methylpentyl group, 2-pentenyl group, hexyl group, Examples thereof include an isohexyl group, a 5-methylhexyl group, a heptyl group, an octyl group, and the like. Such an aliphatic hydrocarbon group may have one or more substituents similar to those in Z 1 to Z 3 . Note that R 1 and R 2 in the general formula 1 and R 7 to R 9 in the general formula 2 may be the same as or different from each other.
一般式1及び一般式2におけるR3乃至R5並びにR10及びR11は、個々の一般式においてそれぞれ独立に、水素原子又は適宜の置換基を表す。置換基の例としては、例えば、メチル基、トリフルオロメチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、sec−ブチル基、tert−ブチル基、ペンチル基、イソペンチル基、ネオペンチル基、tert−ペンチル基、1−メチルペンチル基、2−メチルペンチル基、ヘキシル基、イソヘキシル基、5−メチルヘキシル基、ヘプチル基、オクチル基などの脂肪族炭化水素基、メトキシ基、トリフルオロメトキシ基、エトキシ基、プロポキシ基、ブトキシ基、tert−ブトキシ基、ペンチルオキシ基、フェノキシ基、ベンゾイルオキシ基などのエーテル基、フルオロ基、クロロ基、ブロモ基、ヨード基などのハロゲン基、さらには、ヒドロキシ基、カルボキシ基、シアノ基、ニトロ基などが挙げられる。なお、一般式1及び一般式2において、Y1乃至Y3がヘテロ原子である場合、Z1及びZ2におけるR3乃至R6の一部又は全部、また、Z3におけるR10及びR11の一方若しくは両方が存在しないこととなる。 R 3 to R 5 and R 10 and R 11 in the general formula 1 and the general formula 2 each independently represent a hydrogen atom or an appropriate substituent in each general formula. Examples of the substituent include, for example, methyl group, trifluoromethyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, isopentyl group, and neopentyl group. , Tert-pentyl group, 1-methylpentyl group, 2-methylpentyl group, hexyl group, isohexyl group, 5-methylhexyl group, heptyl group, octyl group and other aliphatic hydrocarbon groups, methoxy group, trifluoromethoxy group , Ethoxy group, propoxy group, butoxy group, tert-butoxy group, ether group such as pentyloxy group, phenoxy group, benzoyloxy group, halogen group such as fluoro group, chloro group, bromo group, iodo group, and Group, carboxy group, cyano group, nitro group and the like. In General Formula 1 and General Formula 2, when Y 1 to Y 3 are heteroatoms, a part or all of R 3 to R 6 in Z 1 and Z 2 , and R 10 and R 11 in Z 3 are used. One or both of them will not exist.
一般式1及び一般式2におけるL1及びL2はポリメチン鎖を表し、一般式1におけるL1としては、例えば、トリメチン鎖、ペンタメチン鎖、ヘプタメチン鎖などの、奇数個のメチン基が連なってなるポリメチン鎖から、また、一般式2におけるL2としては、例えば、ジメチン鎖、テトラメチン鎖、ヘキサメチン鎖などの、偶数個のメチン基が連なってなるポリメチン鎖から選択される。斯かるポリメチン鎖は置換基及び/又は環状基を有していてもよく、置換基の例としては、例えば、メチル基、トリフルオロメチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、sec−ブチル基、tert−ブチル基、ペンチル基、イソペンチル基、ネオペンチル基、tert−ペンチル基などの脂肪族炭化水素基、メトキシ基、トリフルオロメトキシ基、エトキシ基、プロポキシ基、ブトキシ基、tert−ブトキシ基などのエーテル基、フルオロ基、クロロ基、ブロモ基、ヨード基などのハロゲン基、ジフェニルアミノ基、p−メトキシジフェニルアミノ基などのアミノ基、さらには、ニトロ基、シアノ基などが挙げられ、また、環状基としては、例えば、シクロペンテン環、シクロヘキセン環などが挙げられる。ちなみに、波長660nm付近の書込光を用いる光記録媒体における光吸収剤としては、一般式1で表される有機色素化合物であって、L1がヘプタメチン鎖であるものが望ましい。また、波長405nm付近の書込光を用いる光記録媒体へ一般式1又は一般式2で表される有機色素合物を適用する場合には、L1及びL2として、それぞれ、トリメチン鎖及びジメチン鎖を有するものが望ましい。 L 1 and L 2 in Formula 1 and Formula 2 represents a polymethine chain, the L 1 in the general formula 1, for example, trimethine chain, pentamethine chain, such as heptamethine chain, formed by continuous odd number of methine groups from the polymethine chain, and as the L 2 in formula 2, for example, dimethine chain, Tetoramechin chain, such as hexamethine chain, an even number of methine groups selected from polymethine chains comprising continuous. Such a polymethine chain may have a substituent and / or a cyclic group. Examples of the substituent include a methyl group, a trifluoromethyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and an isobutyl group. Group, sec-butyl group, tert-butyl group, pentyl group, isopentyl group, neopentyl group, aliphatic hydrocarbon group such as tert-pentyl group, methoxy group, trifluoromethoxy group, ethoxy group, propoxy group, butoxy group, Ether groups such as tert-butoxy group, halogen groups such as fluoro group, chloro group, bromo group and iodo group, amino groups such as diphenylamino group and p-methoxydiphenylamino group, nitro group, cyano group and the like Examples of the cyclic group include a cyclopentene ring and a cyclohexene ring. That. Incidentally, as the light absorber in the optical recording medium using the writing light having a wavelength of around 660 nm, an organic dye compound represented by the general formula 1 in which L 1 is a heptamethine chain is desirable. Further, when the organic dye compound represented by the general formula 1 or 2 is applied to an optical recording medium using a writing light having a wavelength of around 405 nm, L 1 and L 2 are respectively a trimethine chain and a dimethine. Those having a chain are desirable.
一般式1及び一般式2におけるX1及びX2は対イオンであって、有機溶剤における有機色素化合物の溶解度やガラス状態における安定性を勘案しながら適宜のものとすればよく、通常、弗素イオン、塩素イオン、臭素イオン、沃素イオン、過塩素酸イオン、過沃素酸イオン、六弗化燐酸イオン、六弗化アンチモン酸イオン、六弗化錫酸イオン、硝酸イオン、燐酸イオン、硼弗化水素酸イオン、四弗硼素酸イオンなどの無機酸アニオン、サリチル酸、p−ヒドロキシサリチル酸、チオシアン酸イオン、ベンゼンスルホン酸イオン、ナフタレンスルホン酸イオン、ナフタレンジスルホン酸イオン、p−トルエンスルホン酸イオン、アルキルスルホン酸イオン、ベンゼンスルホン酸イオン、アルキルカルボン酸イオン、トリハロアルキルカルボン酸イオン、アルキル硫酸イオン、トリハロアルキル硫酸イオン、ニコチン酸イオンなどの有機酸アニオン、さらには、アゾ系、ビスフェニルジチオール系、チオカテコールキレート系、チオビスフェノレートキレート系、ビスジオール−α−ジケトン系などの有機金属錯体アニオン、さらには、トリメチルアンモニウムイオン、トリエチルアンモニウムイオンなどのカチオンから選択する。 X 1 and X 2 in the general formula 1 and formula 2 is a counter ion may be as appropriate taking into account the stability in solubility and glass state of the organic dye compound in an organic solvent, usually, fluorine ions , Chlorine ion, bromine ion, iodine ion, perchlorate ion, periodate ion, hexafluorophosphate ion, hexafluoroantimonate ion, hexafluorostannate ion, nitrate ion, phosphate ion, borofluoride Inorganic acid anions such as acid ion and tetrafluoroborate ion, salicylic acid, p-hydroxysalicylic acid, thiocyanate ion, benzenesulfonate ion, naphthalenesulfonate ion, naphthalene disulfonate ion, p-toluenesulfonate ion, alkylsulfonic acid Ion, benzenesulfonate ion, alkylcarboxylate ion, trihaloalkylcarboxylic acid Organic acid anions such as ions, alkyl sulfate ions, trihaloalkyl sulfate ions, nicotinate ions, azo, bisphenyldithiol, thiocatechol chelate, thiobisphenolate chelate, bisdiol-α-diketone, etc. Selected from cations such as trimethylammonium ion and triethylammonium ion.
一般式3について説明すると、Z4及びZ5は互いに同じか異なる芳香族炭化水素又は複素環基を表し、芳香族炭化水素基の例としては、例えば、フェニル基、ビフェニリル基、ナフチル基などが、また、複素環基の例としては、例えば、ピリジル基、キノリル基、イソオキサゾリル基、イソチアゾリル基、イミダゾリル基、オキサゾリル基、チオジアゾリル基、ピラゾリル基などが挙げられる。斯かる芳香族炭化水素基及び複素環基は置換基を1又は複数有していてもよく、置換基の例としては、例えば、一般式1及び一般式2のZ1乃至Z3におけると同様の置換基が挙げられる。一般式3におけるR12は、例えば、フェノール性ヒドロキシ基、カルボキシ基、スルフィノ基、スルホ基などの酸性基を表し、これらの酸性基は無機塩基又は有機塩基との塩の形態であってもよい。 Explaining the general formula 3, Z 4 and Z 5 represent the same or different aromatic hydrocarbon or heterocyclic group, and examples of the aromatic hydrocarbon group include a phenyl group, a biphenylyl group, a naphthyl group, and the like. Examples of the heterocyclic group include pyridyl group, quinolyl group, isoxazolyl group, isothiazolyl group, imidazolyl group, oxazolyl group, thiodiazolyl group, pyrazolyl group and the like. Such an aromatic hydrocarbon group and heterocyclic group may have one or more substituents, and examples of the substituent include, for example, the same as in Z 1 to Z 3 of General Formula 1 and General Formula 2. The substituent of this is mentioned. R 12 in the general formula 3 represents an acidic group such as a phenolic hydroxy group, a carboxy group, a sulfino group, or a sulfo group, and these acidic groups may be in the form of a salt with an inorganic base or an organic base. .
一般式3で表されるアゾ化合物は、通常、その1又は複数が金属(中心原子)に配位してなる金属錯体の形態で用いられる。中心原子となる金属としては、通常、周期律表における第3族乃至第12族の金属元素であって、例えば、原子、酸化物、あるいは、弗化物、臭化物、沃化物などのハロゲン化物の形態にあるものが挙げられる。斯かる金属元素の例としては、例えば、スカンジウム、イットリウム、チタン、ジルコニウム、ハフニウム、バナジウム、ニオブ、タンタル、クロム、モリブデン、タングステン、マンガン、テクネチウム、レニウム、鉄、ルテニウム、オスミウム、コバルト、ロジウム、イリジウム、ニッケル、パラジウム、白金、銅、銀、金、亜鉛、カドミウム、水銀などが挙げられる。 The azo compound represented by the general formula 3 is usually used in the form of a metal complex in which one or more of them are coordinated to a metal (center atom). The metal serving as the central atom is usually a metal element belonging to Group 3 to Group 12 in the periodic table, and is, for example, an atom, an oxide, or a halide such as fluoride, bromide, or iodide. There are the following. Examples of such metal elements include scandium, yttrium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, ruthenium, osmium, cobalt, rhodium, iridium. Nickel, palladium, platinum, copper, silver, gold, zinc, cadmium, mercury and the like.
望ましいのは2価の金属(M)を中心原子とする金属錯体であって、とりわけ、一般式4で表される金属錯体である。一般式4において、Azは一般式3で表されるアゾ化合物であって、mはMに配位する配位子(Az)としてのアゾ化合物の数を表し、通常、1又は2である。Dは適宜対イオンを表し、nは錯体における電荷の均衡を保つためのDの数である。この発明で用いるアゾ金属錯体は、通常、−2価、0価又は1価の電荷をとるが、電荷が0価であるときのnは零であり、したがって、Dは存在しないこととなる。対イオンDとしては、例えば、六弗化燐酸イオン、弗素酸イオン、臭素酸イオン、沃素酸イオン、硝酸イオン、燐酸イオン、過塩素酸イオン、過沃素酸イオン、六弗化アンチモン酸イオン、六弗化錫酸イオン、硼弗化水素酸イオン、四弗硼素酸イオン、チオシアン酸イオン、ベンゼンスルホン酸イオン、ナフタレンスルホン酸イオン、ベンゼンカルボン酸イオン、アルキルカルボン酸イオン、トリハロアルキルカルボン酸イオン、アルキル硫酸イオン、トリハロアルキル硫酸イオン、ニコチン酸イオンなどのアニオンや、アンモニウムイオン、テトラアルキルアンモニウムイオンなどのカチオンが挙げられる。 A metal complex having a divalent metal (M) as a central atom is desirable, and in particular, a metal complex represented by the general formula 4. In General Formula 4, Az is an azo compound represented by General Formula 3, and m represents the number of azo compounds as a ligand (A z ) coordinated to M, and is usually 1 or 2. . D suitably represents a counter ion, and n is the number of D for maintaining the charge balance in the complex. The azo metal complex used in the present invention usually takes a -2, 0, or monovalent charge, but when the charge is zero, n is zero, and therefore D does not exist. Examples of the counter ion D include hexafluorophosphate ion, fluorate ion, bromate ion, iodate ion, nitrate ion, phosphate ion, perchlorate ion, periodate ion, hexafluoroantimonate ion, six Fluorostannate ion, borofluoride ion, tetrafluoroborate ion, thiocyanate ion, benzenesulfonate ion, naphthalenesulfonate ion, benzenecarboxylate ion, alkylcarboxylate ion, trihaloalkylcarboxylate ion, alkyl Examples include anions such as sulfate ion, trihaloalkylsulfate ion, and nicotinate ion, and cations such as ammonium ion and tetraalkylammonium ion.
なお、一般式1乃至一般式3で表される有機色素化合物において、構造上、シス/トランス異性体などの異性体が存在する場合には、いずれの異性体もこの発明に包含されるものとする。 In the organic dye compounds represented by the general formulas 1 to 3, when there is an isomer such as a cis / trans isomer in the structure, any isomer is included in the present invention. To do.
この発明で用いる有機色素化合物の例としては、例えば、化学式1乃至化学式38で表されるものが挙げられる。このうち、化学式1乃至化学式19で表されるものは波長630乃至680nm付近の書込光を用いる光記録媒体において、また、化学式20乃至化学式38で表されるものは波長390乃至450nm付近の書込光を用いる光記録媒体において極めて有用である。化学式1乃至化学式38で表される有機色素化合物は、いずれも、吸収極大の短波長側で上記のごとき書込光を実質的に吸収する。すなわち、化学式1乃至化学式19で表される有機色素化合物は、いずれも、680nmより長波長に吸収極大を有し、吸収極大の短波長側で波長630乃至680nm付近の書込光を実質的に吸収する。また、化学式20乃至化学式38で表される有機色素化合物は、いずれも、450nmより長波長に吸収極大を有し、吸収極大の短波長側で波長390乃至450nm付近の書込光を実質的に吸収する。ちなみに、化学式2で表される有機色素化合物は、薄膜状態において、図1に見られるがごとき可視吸収スペクトルを示す。図1の可視吸収スペクトルから明らかに、化学式2で表される有機色素化合物は波長730nm及び820nm付近にそれぞれ吸収極大を有し、それらの吸収極大の短波長側において波長660nm付近の書込光を実質的に吸収する。なお、化学式1乃至化学式38で表される化合物は、いずれも、公知の方法によるか、あるいは、類縁化合物を調製するための公知の方法に準じて所望量を得ることができる。 Examples of the organic dye compound used in the present invention include those represented by chemical formulas 1 to 38. Among these, those represented by chemical formulas 1 to 19 are optical recording media using writing light having a wavelength of 630 to 680 nm, and those represented by chemical formulas 20 to 38 are those having a wavelength of 390 to 450 nm. This is extremely useful in an optical recording medium using incident light. Any of the organic dye compounds represented by Chemical Formula 1 to Chemical Formula 38 substantially absorbs the writing light as described above on the short wavelength side of the absorption maximum. That is, all of the organic dye compounds represented by Chemical Formulas 1 to 19 have an absorption maximum at a wavelength longer than 680 nm, and substantially write light having a wavelength of 630 to 680 nm on the short wavelength side of the absorption maximum. Absorb. The organic dye compounds represented by the chemical formulas 20 to 38 all have an absorption maximum at a wavelength longer than 450 nm, and substantially write light having a wavelength of 390 to 450 nm on the short wavelength side of the absorption maximum. Absorb. Incidentally, the organic dye compound represented by Chemical Formula 2 shows a visible absorption spectrum as shown in FIG. 1 in a thin film state. Obviously from the visible absorption spectrum of FIG. 1, the organic dye compound represented by the chemical formula 2 has an absorption maximum near wavelengths of 730 nm and 820 nm, respectively, and writing light near a wavelength of 660 nm is emitted on the short wavelength side of these absorption maximums. Absorbs substantially. Any of the compounds represented by Chemical Formulas 1 to 38 can be obtained in a desired amount according to a known method or according to a known method for preparing an analogous compound.
この発明は、既述のとおり、基板と、有機色素化合物を用いてその基板上に設けられた記録層とを含んでなり、その記録層へ書込光を照射し、有機色素化合物をして基板にピットを形成せしめることによって情報を記録する光記録媒体を主たる適用対象とするものである。 As described above, the present invention includes a substrate and a recording layer provided on the substrate using an organic dye compound. The recording layer is irradiated with writing light to form an organic dye compound. The main application target is an optical recording medium that records information by forming pits on a substrate.
斯かる光記録媒体は、この発明の有機色素化合物を用いることによって、従来公知の光記録媒体に準じて作製することができる。一般的な方法としては、例えば、上記したごとき有機色素化合物と、記録層における光反射率や光吸収率を調節すべく、必要に応じて、可視光に感度を有する他の色素化合物の1又は複数を含有せしめたり、汎用の耐光性改善剤、バインダー、分散剤、難燃剤、滑剤、帯電防止剤、界面活性剤、可塑剤などを1又は複数添加したうえで有機溶剤に溶解し、溶液を噴霧法、浸漬法、ローラー塗布法、回転塗布法などにより基板の片面に均一に塗布し、乾燥させることによって記録層となる薄膜を形成した後、必要に応じて、光反射率が45%以上、望ましくは、55%以上になるように、真空蒸着法、化学蒸着法、スパッタリング法、イオンプレーティング法などにより、金、銀、銅、白金、アルミニウム、コバルト、錫、ニッケル、鉄、クロムなどの金属若しくはそれらの合金か、あるいは、汎用の有機系反射層用材による記録層に密着する反射層を形成したり、傷、埃、汚れなどから記録層を保護する目的で、難燃剤、安定剤、帯電防止剤などを含有せしめた紫外線硬化樹脂や熱硬化樹脂などを塗布し、光照射するか加熱して硬化させることによって反射層に密着する保護層を形成する。その後、必要に応じて、上述のようにして記録層、反射層及び記録層を形成した一対の基板を、例えば、接着剤、粘着シートなどにより保護層同士を対向させて貼合せるか、あるいは、保護層に対して基板におけると同様の材料、形状の保護板を貼り付ける。なお、記録層を形成する方法は、当該有機色素化合物を溶液にして塗布する方法に限定されてはならず、昇華性のある有機色素化合物については、それ以外の、例えば、真空蒸着法、化学蒸着法、原子層エピタクシー法などの方法により、有機色素化合物の薄膜を基板上に直接形成してもよい。 Such an optical recording medium can be produced according to a conventionally known optical recording medium by using the organic dye compound of the present invention. As a general method, for example, the organic dye compound as described above and one of the other dye compounds having sensitivity to visible light, if necessary, in order to adjust the light reflectance and light absorption rate in the recording layer, or Add one or more general light resistance improvers, binders, dispersants, flame retardants, lubricants, antistatic agents, surfactants, plasticizers, etc., and then dissolve in an organic solvent. After forming a thin film to be a recording layer by uniformly applying to one side of the substrate by spraying, dipping, roller coating, spin coating, etc. and drying, if necessary, the light reflectance is 45% or more Desirably, gold, silver, copper, platinum, aluminum, cobalt, tin, nickel, iron, chromium, vacuum deposition method, chemical vapor deposition method, sputtering method, ion plating method etc. In order to protect the recording layer from scratches, dust, dirt, etc., with a flame retardant, stable A protective layer that adheres to the reflective layer is formed by applying an ultraviolet curable resin, a thermosetting resin, or the like containing an agent, an antistatic agent, or the like, and curing by irradiation with light or heating. Thereafter, if necessary, the pair of substrates on which the recording layer, the reflective layer, and the recording layer are formed as described above are bonded with the protective layers facing each other with, for example, an adhesive or an adhesive sheet, or A protective plate of the same material and shape as in the substrate is attached to the protective layer. The method for forming the recording layer should not be limited to the method of applying the organic dye compound as a solution. For the organic dye compound having a sublimation property, other methods such as vacuum deposition, A thin film of an organic dye compound may be formed directly on the substrate by a method such as vapor deposition or atomic layer epitaxy.
耐光性改善剤としては、例えば、ニトロソジフェニルアミン、ニトロソアニリン、ニトロソフェノール、ニトロソナフトールなどのニトロソ化合物や、テトラシアノキノジメタン化合物、ジインモニウム塩、ビス[2´−クロロ−3−メトキシ−4−(2−メトキシエトキシ)ジチオベンジル]ニッケル(商品名『NKX−1199』、株式会社林原生物化学研究所製造)、アゾ系金属錯体、ホルマザン金属錯体などの金属錯体が用いられ、必要に応じて、これらは適宜組合せて用いられる。望ましい耐光性改善剤はニトロソ化合物やホルマザン金属錯体を含んでなるものであり、特に望ましいのは、同じ特許出願人による特願平11−88983号明細書(発明の名称「フェニルピリジルアミン誘導体」)に開示されたフェニルピリジルアミン骨格を有するニトロソ化合物か、あるいは、特願平11−163036号明細書(発明の名称「ホルマザン金属錯体」)に開示された、ホルマザン骨格における5位の位置にピリジン環を有し、かつ、3位の位置にピリジン環若しくはフラン環が結合してなるホルマザン化合物又はその互変異性体の1又は複数を配位子とする、例えば、ニッケル、亜鉛、コバルト、鉄、銅、パラジウムなどとの金属錯体を含んでなるものである。斯かる耐光性改善剤と併用するときには、有機溶剤における当該有機色素化合物の溶解性を低下させたり、望ましい光特性を実質的に損なうことなく、読取光や環境光などへの露光による有機色素化合物の劣化、退色、変色、変性などの望ましくない変化を効果的に抑制することができる。配合比としては、通常、有機色素化合物1モルに対して、耐光性改善剤を0.01乃至5モル、望ましくは、0.1乃至2モルの範囲で加減しながら含有せしめる。 Examples of the light resistance improver include nitroso compounds such as nitrosodiphenylamine, nitrosoaniline, nitrosophenol, nitrosonaphthol, tetracyanoquinodimethane compounds, diimmonium salts, bis [2′-chloro-3-methoxy-4- ( 2-methoxyethoxy) dithiobenzyl] nickel (trade name “NKX-1199” manufactured by Hayashibara Biochemical Laboratories Co., Ltd.), metal complexes such as azo metal complexes and formazan metal complexes are used. Are used in appropriate combination. Desirable light fastness improving agents are those comprising a nitroso compound or a formazan metal complex, and particularly desirable is Japanese Patent Application No. 11-88983 (name of the invention "phenylpyridylamine derivative") by the same patent applicant. Or a pyridine ring at position 5 in the formazan skeleton disclosed in Japanese Patent Application No. 11-163036 (name of invention “formazan metal complex”). And a formazan compound in which a pyridine ring or a furan ring is bonded to the position 3 or a tautomer thereof, for example, nickel, zinc, cobalt, iron, It comprises a metal complex with copper, palladium or the like. When used in combination with such a light fastness improver, the organic dye compound by exposure to reading light, ambient light, etc. without reducing the solubility of the organic dye compound in the organic solvent or substantially impairing the desired optical properties Undesirable changes such as deterioration, discoloration, discoloration, and modification can be effectively suppressed. As a compounding ratio, usually, a light fastness improver is contained in an amount of 0.01 to 5 mol, preferably 0.1 to 2 mol, with respect to 1 mol of the organic dye compound.
有機色素化合物を基板に塗布するための有機溶剤としては、光記録媒体の作製に頻用されるTFPか、あるいは、ヘキサン、シクロヘキサン、メチルシクロヘキサン、ジメチルシクロヘキサン、エチルシクロヘキサン、イソプロピルシクロヘキサン、tert−ブチルシクロヘキサン、オクタン、シクロオクタン、ベンゼン、トルエン、キシレンなどの炭化水素類、四塩化炭素、クロロホルム、1,2−ジクロロエタン、1,2−ジブロモエタン、トリクロロエチレン、テトラクロロエチレン、クロロベンゼン、ブロモベンゼン、α−ジクロロベンゼンなどのハロゲン化物、メタノール、エタノール、2,2,2−トリフルオロエタノール、2−メトキシエタノール(メチルセロソルブ)、2−エトキシエタノール(エチルセロソルブ)、2−イソプロポキシ−1−エタノール、1−プロパノール、2−プロパノール、1−エトキシ−2−プロパノール、1−エトキシ−2−プロパノール、1−ブタノール、1−メトキシ−2−ブタノール、3−メトキシ−1−ブタノール、4−メトキシ−1−ブタノール、イソブチルアルコール、ペンチルアルコール、イソペンチルアルコール、シクロヘキサノール、ジエチレングリコール、トリエチレングリコール、プロピレングリコール、グリセリン、ジアセトンアルコール、フェノール、ベンジルアルコール、クレゾールなどのアルコール類及びフェノール類、ジエチルエーテル、ジイソプロピルエーテル、テトラヒドロフラン、テトラヒドロピラン、1,4−ジオキサン、アニソール、1,2−ジメトキシエタン、ジエチレングリコールジメチルエーテル、ジシクロヘキシル−18−クラウン−6、メチルカルビトール、エチルカルビトールなどのエーテル類、フルフラール、アセトン、1,3−ジアセチルアセトン、エチルメチルケトン、シクロヘキサノンなどのケトン類、酢酸エチル、酢酸ブチル、炭酸エチレン、炭酸プロピレン、燐酸トリメチルなどのエステル類、ホルムアミド、N−メチルホルムアミド、N,N−ジメチルホルムアミド、ヘキサメチル燐酸トリアミドなどのアミド類、アセトニトリル、プロピオニトリル、スクシノニトリル、ベンゾニトリルなどのニトリル類、ニトロメタン、ニトロベンゼンなどのニトロ化合物、エチレンジアミン、ピリジン、ピペリジン、モルホリン、N−メチルピロリドンなどのアミン類、ジメチルスルホキシド、スルホランなどの含硫化合物をはじめとするTFP以外の汎用の有機溶剤から選択し、必要に応じて、これらを適宜混合して用いる。 As an organic solvent for applying an organic dye compound to a substrate, TFP frequently used in the production of optical recording media, or hexane, cyclohexane, methylcyclohexane, dimethylcyclohexane, ethylcyclohexane, isopropylcyclohexane, tert-butylcyclohexane, Hydrocarbons such as octane, cyclooctane, benzene, toluene, xylene, carbon tetrachloride, chloroform, 1,2-dichloroethane, 1,2-dibromoethane, trichloroethylene, tetrachloroethylene, chlorobenzene, bromobenzene, α-dichlorobenzene, etc. Halide, methanol, ethanol, 2,2,2-trifluoroethanol, 2-methoxyethanol (methyl cellosolve), 2-ethoxyethanol (ethyl cellosolve), 2 Isopropoxy-1-ethanol, 1-propanol, 2-propanol, 1-ethoxy-2-propanol, 1-ethoxy-2-propanol, 1-butanol, 1-methoxy-2-butanol, 3-methoxy-1-butanol , 4-methoxy-1-butanol, isobutyl alcohol, pentyl alcohol, isopentyl alcohol, cyclohexanol, diethylene glycol, triethylene glycol, propylene glycol, glycerin, diacetone alcohol, phenols, benzyl alcohol, cresol and other alcohols and phenols , Diethyl ether, diisopropyl ether, tetrahydrofuran, tetrahydropyran, 1,4-dioxane, anisole, 1,2-dimethoxyethane, diethylene glycol di Ethers such as methyl ether, dicyclohexyl-18-crown-6, methyl carbitol, ethyl carbitol, furfural, acetone, 1,3-diacetylacetone, ethyl methyl ketone, ketones such as cyclohexanone, ethyl acetate, butyl acetate, Esters such as ethylene carbonate, propylene carbonate and trimethyl phosphate, amides such as formamide, N-methylformamide, N, N-dimethylformamide and hexamethylphosphoric triamide, nitriles such as acetonitrile, propionitrile, succinonitrile and benzonitrile , Nitro compounds such as nitromethane, nitrobenzene, amines such as ethylenediamine, pyridine, piperidine, morpholine, N-methylpyrrolidone, dimethyl sulfoxide, sulfolane, etc. Select sulfur-containing compounds from the general-purpose organic solvents other than TFP including, if necessary, or a mixture of them.
基板も汎用のものでよく、通常、圧出成形法、射出成形法、圧出射出成形法、フォトポリマー法(2P法)、熱硬化一体成形法、光硬化一体成形法などにより適宜の材料を最終用途に応じて、例えば、直径12cm、厚さ0.6mm又は1.2mmのディスク状に形成し、これを単板で用いるか、あるいは、粘着シート、接着剤などにより適宜貼合せて用いる。基板の材料としては、実質的に透明で、波長400乃至800nmの範囲の光に対して80%以上、望ましくは、90%以上の透過率を有するものであれば、原理上、材質は問わない。個々の材料としては、例えば、ガラス、セラミックのほかに、ポリメチルメタクリレート、ポリカーボネート、ポリスチレン(スチレン共重合物)、ポリメチルペンテン、ポリエーテルイミド、ポリエーテルスルホン、ポリアリレート、ポリカーボネート・ポリスチレン−アロイ、ポリエステルカーボネート、ポリフタレートカーボネート、ポリカーボネートアクリレート、非晶性ポリオレフィン、メタクリレート共重合物、ジアリルカーボネートジエチレングリコール、エポキシ樹脂などのプラスチックが用いられ、通常、ポリカーボネートが頻用される。プラスチック製基板の場合、同期信号並びにトラック及びセクターの番地を表示する凹部は、通常、成形の際にトラック内周に転写される。その凹部は、形状については特に制限はないものの、平均幅が0.1乃至0.8μmの範囲になるように、また、深さが20乃至300nmの範囲になるようにするのが望ましい。 The substrate may be a general-purpose one, and usually an appropriate material is obtained by an extrusion molding method, an injection molding method, an extrusion injection molding method, a photopolymer method (2P method), a thermosetting integral molding method, a photocuring integral molding method, or the like. Depending on the final application, for example, it is formed into a disk shape having a diameter of 12 cm and a thickness of 0.6 mm or 1.2 mm, and this is used as a single plate, or it is used by suitably bonding with an adhesive sheet, an adhesive or the like. The material of the substrate is not particularly limited as long as it is substantially transparent and has a transmittance of 80% or more, preferably 90% or more with respect to light in the wavelength range of 400 to 800 nm. . Examples of the individual materials include glass, ceramic, polymethyl methacrylate, polycarbonate, polystyrene (styrene copolymer), polymethylpentene, polyetherimide, polyethersulfone, polyarylate, polycarbonate / polystyrene-alloy, Plastics such as polyester carbonate, polyphthalate carbonate, polycarbonate acrylate, amorphous polyolefin, methacrylate copolymer, diallyl carbonate diethylene glycol, and epoxy resin are used, and polycarbonate is usually used frequently. In the case of a plastic substrate, the sync signal and the recess for displaying the track and sector addresses are usually transferred to the track inner circumference during molding. Although there is no particular limitation on the shape of the concave portion, it is desirable that the average width is in the range of 0.1 to 0.8 μm and the depth is in the range of 20 to 300 nm.
基板に当該有機色素化合物を塗布することによって記録層を構成する場合には、有機色素化合物を前述のごとき有機溶剤における濃度0.5乃至5%(w/w)の溶液にして、乾燥後の記録層の厚みが10乃至1,000nm、望ましくは、50乃至500nmになるように基板に均一に塗布する。なお、溶液の塗布に先立って、基板の保護や接着性の改善などを目的に、必要に応じて、基板に下引層を設けてもよく、下引層の材料としては、例えば、イオノマー樹脂、ポリアミド樹脂、ビニル系樹脂、天然樹脂、シリコン、液状ゴムなどの高分子物質が挙げられる。また、バインダーを用いる場合には、ニトロセルロース、燐酸セルロース、硫酸セルロース、酢酸セルロース、プロピオン酸セルロース、酪酸セルロース、パルミチン酸セルロース、酢酸・プロピオン酸セルロースなどのセルロースエステル類、メチルセルロース、エチルセルロース、プロピルセルロース、ブチルセルロースなどのセルロースエステル類、ポリスチレン、ポリ塩化ビニル、ポリ酢酸ビニル、ポリビニルアセタール、ポリビニルブチラール、ポリビニルホルマール、ポリビニルアルコール、ポリビニルピロリドンなどのビニル樹脂、スチレン−ブタジエンコポリマー、スチレン−アクリロニトリルコポリマー、スチレン−ブタジエン−アクリロニトリルコポリマー、塩化ビニル−酢酸ビニルコポリマー、無水マレイン酸共重合体などの共重合樹脂類、ポリメチルメタクリレート、ポリメチルアクリレート、ポリアクリレート、ポリメタクリレート、ポリアクリルアミド、ポリアクリロニトリルなどのアクリル樹脂類、ポリエチレンテレフタレートなどのポリエステル類、ポリエチレン、塩素化ポリエチレン、ポリプロピレンなどのポリオレフィン類をはじめとするポリマーが単独又は組合せて、重量比で、有機色素化合物の0.01乃至10倍用いられる。 When the recording layer is formed by applying the organic dye compound to the substrate, the organic dye compound is made into a solution having a concentration of 0.5 to 5% (w / w) in the organic solvent as described above, and after drying. The recording layer is uniformly coated on the substrate so that the thickness of the recording layer is 10 to 1,000 nm, preferably 50 to 500 nm. Prior to the application of the solution, an undercoat layer may be provided on the substrate as necessary for the purpose of protecting the substrate and improving adhesion. Examples of the material of the undercoat layer include ionomer resins. , Polymer materials such as polyamide resin, vinyl resin, natural resin, silicon, and liquid rubber. When using a binder, cellulose esters such as nitrocellulose, cellulose phosphate, cellulose sulfate, cellulose acetate, cellulose propionate, cellulose butyrate, cellulose palmitate, cellulose acetate / propionate, methyl cellulose, ethyl cellulose, propyl cellulose, Cellulose esters such as butyl cellulose, polystyrene, polyvinyl chloride, polyvinyl acetate, polyvinyl acetal, polyvinyl butyral, polyvinyl formal, polyvinyl alcohol, polyvinyl pyrrolidone and other vinyl resins, styrene-butadiene copolymers, styrene-acrylonitrile copolymers, styrene-butadiene -Acrylonitrile copolymer, vinyl chloride-vinyl acetate copolymer, maleic anhydride copolymer Copolymer resins such as polymethyl methacrylate, polymethyl acrylate, polyacrylate, polymethacrylate, polyacrylamide, polyacrylonitrile and other acrylic resins, polyethylene terephthalate and other polyesters, polyethylene, chlorinated polyethylene, polypropylene and other polyolefins In addition, the polymer such as is used alone or in combination and is used in a weight ratio of 0.01 to 10 times that of the organic dye compound.
この発明による光記録媒体の使用方法について説明すると、この発明によるDVD−Rなどの高密度光記録媒体は、例えば、GaN系、AlGaInP系、GaAsP系、GaAlAs系、InGaP系、InGaAsP系若しくはInGaAlP系の半導体レーザーか、あるいは、分布帰還型、ブラッグ反射型などの第二高調波発生素子(SHG素子)と組合せたNd−YAGレーザーなどによる波長680nm以下のレーザー光、とりわけ、390乃至450nm、あるいは、630乃至680nmのレーザー光を用いて諸種の情報を高密度に書き込むことができる。読取には、書込におけると同様の波長か、あるいは、それをやや上回る波長のレーザー光を用いる。書込、読取の際のレーザー出力について言えば、この発明において有機色素化合物と組合せて用いる耐光性改善剤の種類と配合量にもよるけれども、この発明による光記録媒体においては、情報を書き込むときのレーザー出力は、ピットが形成されるエネルギーの閾値を越えて比較的強めに、一方、書き込まれた情報を読み取るときの出力は、その閾値を下回って比較的弱めに設定するのが望ましい。一般的には、4mWを上回り、50mWを越えない範囲で書き込み、読取は0.1乃至4mWの範囲で加減する。記録された情報は、光ピックアップにより、光記録媒体の記録面におけるピットとピットが形成されていない部分の反射光量又は透過光量の変化を検出することによって読み取る。 The method of using the optical recording medium according to the present invention will be described. A high-density optical recording medium such as a DVD-R according to the present invention is, for example, a GaN-based, AlGaInP-based, GaAsP-based, GaAlAs-based, InGaP-based, InGaAsP-based or InGaAlP-based Or a laser beam having a wavelength of 680 nm or less, particularly 390 to 450 nm, or a Nd-YAG laser combined with a second harmonic generation element (SHG element) such as a distributed feedback type or a Bragg reflection type, Various kinds of information can be written with high density using laser light of 630 to 680 nm. For reading, a laser beam having the same wavelength as that for writing or slightly higher wavelength is used. Regarding the laser output at the time of writing and reading, although it depends on the kind and blending amount of the light fastness improver used in combination with the organic dye compound in the present invention, the optical recording medium according to the present invention is used for writing information. It is desirable to set the output of the laser beam to be relatively stronger than the threshold value of energy for forming pits, while the output when reading written information is set to be relatively weaker than the threshold value. Generally, writing is performed in a range exceeding 4 mW and not exceeding 50 mW, and reading is adjusted in a range of 0.1 to 4 mW. The recorded information is read by detecting a change in the amount of reflected light or the amount of transmitted light at a portion where no pit is formed on the recording surface of the optical recording medium by an optical pickup.
斯くして、この発明による光記録媒体においては、波長700nm以下のレーザー光によるピックアップを用いることによって、現行の標準的なCD−Rに採用されている1.6μmを下回るトラックピッチで0.834μm/ピットを下回るピット長の微小なピットを高密度に形成することができる。したがって、例えば、直径12cmのディスク状基板を用いる場合には、現行の標準的なCD−Rによっては容易に達成できなかった、記録容量が片面で0.682GBを遥かに越え(通常、片面4.7GB以上)、画像及び音声を約2時間分記録できる極めて高密度の光記録媒体を実現できることとなる。 Thus, in the optical recording medium according to the present invention, by using a pickup with a laser beam having a wavelength of 700 nm or less, a track pitch of less than 1.6 μm employed in the current standard CD-R is 0.834 μm. / It is possible to form minute pits having a pit length below the pit with high density. Therefore, for example, when a disk-shaped substrate having a diameter of 12 cm is used, the recording capacity that cannot be easily achieved by the current standard CD-R exceeds 0.682 GB on one side (usually 4 on one side). .7 GB or more), an extremely high density optical recording medium capable of recording images and sounds for about two hours can be realized.
この発明による光記録媒体は、文字情報、画像情報、音声情報及びその他のデジタル情報を高密度に記録することができるので、文書、図面、データ及びコンピュータープログラムなどを記録・管理するための民生用及び業務用記録媒体として極めて有用である。この発明による光記録媒体を用い得る個々の業種と情報の形態としては、例えば、建設・土木における建築・土木図面、地図、道路・河川台帳、アパチュアカード、建築物見取図、災害防止資料、配線図、配置図、新聞・雑誌情報、地域情報、工事報告書など、製造における設計図、成分表、処方、商品仕様書、商品価格表、パーツリスト、メンテナンス情報、事故・故障事例集、苦情処理事例集、製造工程表、技術資料、デッサン、ディテール、自社作品集、技術報告書、検査報告書など、販売における顧客情報、取引先情報、会社情報、契約書、新聞・雑誌情報、営業報告書、企業信用調査、在庫一覧など、金融における会社情報、株価記録、統計資料、新聞・雑誌情報、契約書、顧客リスト、各種申請・届出・免許・許認可書類、業務報告書など、不動産・運輸における物件情報、建築物見取図、地図、地域情報など、電力・ガスにおける配線・配管図、災害防止資料、作業基準表、調査資料、技術報告書など、医療におけるカルテ、病歴・症例ファイル、医療関係図など、塾・予備校におけるテキスト、問題集、教育用資料、統計資料など、大学・研究所における学術論文、学会記録、研究月報、研究データ、文献及び文献のインデックスなど、情報における調査データ、論文、特許公報、天気図、データ解析記録、顧客ファイルなど、法律における判例など、観光における観光情報、交通情報など、マスコミ・出版における自社出版物のインデックス、新聞・雑誌情報、人物ファイル、スポーツ記録、テロップファイル、放送台本など、官庁関係における地図、道路・河川台帳、指紋ファイル、住民票、各種申請・届出・免許・許認可資料、統計資料、公共資料などが挙げられる。とりわけ、一回のみ書き込めるこの発明の光記録媒体は、記録情報が改竄されたり消去されてはならない、例えば、カルテや公文書などの記録保存に加えて、美術館、図書館、博物館、放送局などの電子ライブラリーとしても極めて有用である。 The optical recording medium according to the present invention can record character information, image information, audio information, and other digital information with high density, so that it can be used for recording and managing documents, drawings, data, computer programs, etc. In addition, it is extremely useful as a business recording medium. Examples of individual industries that can use the optical recording medium according to the present invention and the form of information include, for example, construction and civil engineering drawings in construction and civil engineering, maps, road and river accounts, aperture cards, architectural sketches, disaster prevention materials, and wiring diagrams. , Layout drawings, newspaper / magazine information, regional information, construction reports, etc., manufacturing drawings, composition tables, prescriptions, product specifications, product price lists, parts lists, maintenance information, accident / failure cases, complaint cases Collection, manufacturing process table, technical data, drawings, details, in-house collection, technical report, inspection report, etc., customer information in sales, business partner information, company information, contract, newspaper / magazine information, sales report, Corporate credit surveys, inventory lists, financial company information, stock price records, statistical materials, newspaper / magazine information, contracts, customer lists, various applications / reports / licenses / licensing documents, operations Medical records such as notifications, real estate / transport property information, building sketches, maps, regional information, power / gas wiring / piping diagrams, disaster prevention materials, work standards tables, survey materials, technical reports, etc. Medical history / case files, medical charts, textbooks, problem collections, educational materials, statistical materials, etc., academic papers, academic records, monthly research reports, research data, literature and literature indexes, etc. , Survey data in information, papers, patent gazettes, weather maps, data analysis records, customer files, legal precedents, tourism information in tourism, traffic information, etc. Index of in-house publications in the media / publishing, newspaper / magazine information , People files, sports records, telop files, broadcast scripts, maps related to government offices, roads and rivers Ledger, fingerprint files, resident card, various types of application and notification and licensing, licensing documents, statistical data, such as public documents, and the like. In particular, the optical recording medium of the present invention, which can be written only once, must not have the recorded information altered or erased. For example, in addition to record storage of medical records and official documents, such as museums, libraries, museums, broadcasting stations, etc. It is extremely useful as an electronic library.
この発明による光記録媒体のやや特殊な用途としては、コンパクトディスク、デジタルビデオディスク、レーザーディスク、MD(光磁気ディスクを用いる情報記録システム)、CDV(コンパクトディスクを利用するレーザーディスク)、DAT(磁気テープを利用する情報記録システム)、CD−ROM(コンパクトディスクを利用する読取専用メモリ)、DVD−RAM(デジタルビデオディスクを利用する書込可能な読取メモリ)、デジタル写真、映画、ビデオソフト、オーディオソフト、コンピューターグラフィック、出版物、放送番組、コマーシャルメッセージ、ゲームソフトなどの編集、校正、さらには、大型コンピューター、カーナビゲーション用の外部プログラム記録手段としての用途が挙げられる。 The optical recording medium according to the present invention has some special applications such as a compact disk, digital video disk, laser disk, MD (information recording system using a magneto-optical disk), CDV (laser disk using a compact disk), DAT (magnetic). Information recording system using tape), CD-ROM (read-only memory using compact disc), DVD-RAM (writable read memory using digital video disc), digital photograph, movie, video software, audio Examples include editing, proofreading of software, computer graphics, publications, broadcast programs, commercial messages, game software, etc., as well as large computer and external program recording means for car navigation.
以下、この発明の実施の形態につき、実施例に基づいて説明する。 Hereinafter, embodiments of the present invention will be described based on examples.
〈光記録媒体〉
光吸収剤として、波長405nmより長波長に吸収極大を有する化学式20、化学式23、化学式26、化学式30又は化学式35のいずれかで表される有機色素化合物をTFPに濃度2%(w/w)になるように添加し、さらに、耐光性改善剤として化学式39で表されるニトロソ化合物を濃度0.5%(w/w)になるように加え、暫時加熱した後、超音波を印加して溶解した。常法にしたがって、この溶液を膜濾過した後、トラック内周に同期信号並びにトラック及びセクターの番地を表示する凹部を転写しておいたポリカーボネート製のディスク状基板(直径12cm、厚さ0.6mm)の片面に均一に回転塗布し、乾燥して厚さ120nmの記録層を形成した。その後、基板に銀を厚さ100nmになるようにスパッタリングして記録層に密着する反射層を形成し、さらに、その反射層に公知の紫外線硬化樹脂(商品名『ダイキュアクリアSD1700』、大日本インキ化学工業株式会社製造)を均一に回転塗布し、光照射して反射層に密着する保護層を形成した後、保護層に密着させてポリカーボネート製のディスク状保護板(直径12cm、厚さ0.6mm)を貼り付けることによって光記録媒体を作製した。
<Optical recording medium>
As a light absorber, an organic dye compound represented by any one of Chemical Formula 20, Chemical Formula 23, Chemical Formula 26, Chemical Formula 30 or Chemical Formula 35 having an absorption maximum at a wavelength longer than 405 nm is added to TFP at a concentration of 2% (w / w). Furthermore, a nitroso compound represented by the chemical formula 39 as a light fastness improving agent is added to a concentration of 0.5% (w / w), heated for a while, and then applied with ultrasonic waves. Dissolved. According to a conventional method, this solution is subjected to membrane filtration, and then a polycarbonate disk-shaped substrate (diameter: 12 cm, thickness: 0.6 mm) in which a recess indicating the sync signal and the track and sector addresses is transferred to the track inner periphery. ) Was uniformly spin-coated on one side and dried to form a recording layer having a thickness of 120 nm. Thereafter, a reflective layer that adheres to the recording layer is formed by sputtering silver to a thickness of 100 nm on the substrate, and a known ultraviolet curable resin (trade name “Dicure Clear SD1700”, Dainippon, Japan) is formed on the reflective layer. Ink Chemical Industry Co., Ltd.) is uniformly applied by spin coating, and after forming a protective layer that adheres to the reflective layer by irradiating with light, it is adhered to the protective layer to form a disk-shaped protective plate made of polycarbonate (diameter 12 cm, thickness 0) .6 mm) was attached to produce an optical recording medium.
本例の光記録媒体は、いずれも、15GBを越える記録容量を有し、発振波長405nm付近のレーザー素子を用いることにより、大量の文書情報、画像情報、音声情報及びその他のデジタル情報を高密度に書き込むことができる。発振波長405nmの半導体レーザー素子を用いて情報を書き込んだ本例の光記録媒体の記録面を電子顕微鏡で観察したところ、1μm/ピットを下回る微小なピットが1μmを下回るトラックピッチで高密度に形成されていた。 All of the optical recording media of this example have a recording capacity exceeding 15 GB, and a large amount of document information, image information, audio information, and other digital information can be collected at high density by using a laser element having an oscillation wavelength of about 405 nm. Can be written on. When the recording surface of the optical recording medium of the present example in which information was written using a semiconductor laser element having an oscillation wavelength of 405 nm was observed with an electron microscope, minute pits less than 1 μm / pit were formed at a high density with a track pitch less than 1 μm. It had been.
以上説明したとおり、この発明は、従来、光記録媒体へ適用できないと考えられていた有機色素化合物であっても、吸収極大の短波長側で書込光を実質的に吸収するものは、光記録媒体の基板にピットを形成する主体となる光吸収剤として極めて有利に用い得るという独自の知見に基づくものである。この発明は、従来、光記録媒体へ適用できないと考えられていた有機色素化合物の潜在的用途を発掘し、もって、光記録媒体、とりわけ、波長700nm以下の書込光を用いる高密度光記録媒体を作製するに当って、基板にピットを形成する主体となる有機色素化合物の選択肢を大幅に広げるものである。 As described above, the present invention is an organic dye compound that is conventionally considered to be inapplicable to an optical recording medium, but substantially absorbs writing light on the short wavelength side of the absorption maximum. This is based on a unique finding that it can be used very advantageously as a light absorber that is a main component of forming pits on a substrate of a recording medium. The present invention uncovers the potential uses of organic dye compounds that were conventionally considered to be inapplicable to optical recording media, and therefore, optical recording media, and in particular, high-density optical recording media using writing light having a wavelength of 700 nm or less. In this case, the choice of the organic dye compound that mainly forms pits on the substrate is greatly expanded.
斯くも顕著な効果を奏するこの発明は、斯界に貢献すること誠に多大な、意義のある発明であると言える。 It can be said that this invention having such remarkable effects is a very significant invention that contributes to the world.
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