JPH03256241A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPH03256241A JPH03256241A JP2055353A JP5535390A JPH03256241A JP H03256241 A JPH03256241 A JP H03256241A JP 2055353 A JP2055353 A JP 2055353A JP 5535390 A JP5535390 A JP 5535390A JP H03256241 A JPH03256241 A JP H03256241A
- Authority
- JP
- Japan
- Prior art keywords
- shape
- resin
- shape memory
- layer
- resin layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 67
- 239000011347 resin Substances 0.000 claims abstract description 67
- 239000010410 layer Substances 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims abstract description 3
- 239000011241 protective layer Substances 0.000 claims abstract description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 21
- 229920001971 elastomer Polymers 0.000 abstract description 8
- 239000005060 rubber Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000000465 moulding Methods 0.000 description 7
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- 239000010408 film Substances 0.000 description 5
- 230000001678 irradiating effect Effects 0.000 description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- XRERONKQLIQWGW-UHFFFAOYSA-N but-1-ene;styrene Chemical compound CCC=C.C=CC1=CC=CC=C1 XRERONKQLIQWGW-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000366 colloid method Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- -1 methyl ethyl Chemical group 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- 238000007740 vapor 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】
産業上の利用分野
本発明は安価な書換え可能型の光デイスク記録媒体に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an inexpensive rewritable optical disc recording medium.
従来の技術
２１＼−７
従来、光学的記録再生方法による光記録媒体として、種
々の材料を用いたものが提案されている。BACKGROUND ART 21\-7 Conventionally, optical recording media using various materials have been proposed using optical recording and reproducing methods.
その中の１つに、形状記憶樹脂を用いた光記録媒体が知
られている。例えば、特開昭６０−４５９５３公報、特
開昭６０−４５９５４公報、特開昭６０６１９３０公報
などに形状記憶樹脂を用いた光デイヌク記録媒体の記載
がある。One of these is an optical recording medium using shape memory resin. For example, JP-A-60-45953, JP-A-60-45954, JP-A-6061930, etc. describe optical DINUC recording media using shape memory resin.
形状記憶樹脂は、高温においてゴム弾性を示し、低温で
はゴム弾性を示さない樹脂で、通称は熱収縮性樹脂とも
呼ばれる。形状記憶樹脂はゴム弾性を示す高温において
応力または変形を与え、その１ｘ室温に冷却するとゴム
弾性が消滅し、高温状態で加えられた応力が固定される
。その後再び高温に加熱するとゴム弾性を回復し、先に
加えられ固定されていた応力により形状が元に戻り、応
力は弛緩される。Shape memory resin is a resin that exhibits rubber elasticity at high temperatures but does not exhibit rubber elasticity at low temperatures, and is also commonly referred to as heat-shrinkable resin. Shape memory resin gives stress or deformation at high temperatures exhibiting rubber elasticity, and when cooled to 1x room temperature, the rubber elasticity disappears and the stress applied at high temperatures is fixed. After that, when heated to a high temperature again, the rubber elasticity is restored, and the stress that was previously applied and fixed returns to its original shape, and the stress is relaxed.
この形状記憶効果と反射光の位相差による干渉効果によ
り光学的記録を行なうものである。例えば、架橋ポリエ
チレンシートを１３６°Ｃ以上に加熱しゴム弾性を生じ
させた状態で、溝形状を反転３１＼−ン
させた形状のスタンバで加圧しながら冷却固化させ、溝
の形成されたポリエチレンシートを作る。Optical recording is performed by this shape memory effect and the interference effect due to the phase difference of reflected light. For example, a cross-linked polyethylene sheet is heated to 136°C or higher to produce rubber elasticity, and then cooled and solidified while being pressurized with a stub bar with the groove shape reversed. make.
このシートの溝面にＡｄ反射膜を蒸着またはスパッタに
よりコートする。溝の深さはレーザ光の波長λのＡ波長
にした場合、反射レーザ光は干渉し互に打ち消し合う。An Ad reflective film is coated on the grooved surface of this sheet by vapor deposition or sputtering. When the depth of the groove is set to wavelength A of the wavelength λ of the laser beam, the reflected laser beams interfere and cancel each other out.
この溝にレーザ光を照射して形状記憶樹脂の弾性体にな
る温度１３５°Ｃ以上に加熱すると、加熱された部分の
み元の状態に戻り溝形状は消滅する。この部分ではレー
ザ光の干渉は起こらない。このようなレーザ光の反射光
の差により記録信号を読みとるものである。When this groove is irradiated with a laser beam and heated to a temperature of 135° C. or higher at which the shape memory resin becomes an elastic body, only the heated portion returns to its original state and the groove shape disappears. No interference of laser light occurs in this part. Recorded signals are read based on the difference in the reflected light of the laser beams.
形状記憶樹脂は架橋ポリオレフィン、架橋フッ素樹脂、
合成ゴムなどが用いられ、非常に安価な材料である。Shape memory resins include crosslinked polyolefin, crosslinked fluororesin,
Synthetic rubber is used and is a very inexpensive material.
発明が解決しようとする課題
このような従来の形状記憶樹脂を用いた光デイスク記録
媒体は記録、再生、消去はできるが、再び記録すること
ができない。すなわち、書換えは不可能であるという課
題があった。Problems to be Solved by the Invention Although optical disc recording media using such conventional shape memory resins can be recorded, reproduced, and erased, they cannot be rerecorded. In other words, there was a problem that rewriting was impossible.
本発明はこのような課題を解決するもので、安価で、現
行のＣＤプレーヤとの互換性がある、書換え可能な光デ
イスク記録媒体を提供することを目的とするものである
。The present invention solves these problems and aims to provide a rewritable optical disc recording medium that is inexpensive and compatible with current CD players.
課題を解決するための手段
この課題を解決するために本発明は、ディスク基板上に
、形状記憶樹脂層と、それに密着して形成された熱硬化
性樹脂層とそれに密着して形成された反射層と、さらに
それに密着して形成された保護層とで構成されたもので
あり、熱硬化性樹脂層の熱膨張力と、形状記憶樹脂層の
温度変化による形状変化と回復作用を利用して、信号の
書込みと読み取り、および消去を行なうようにしたもの
である。Means for Solving the Problems In order to solve the problems, the present invention provides a shape memory resin layer, a thermosetting resin layer formed in close contact with the shape memory resin layer, and a reflective layer formed in close contact with the shape memory resin layer on the disk substrate. It is composed of a layer and a protective layer formed in close contact with it, and utilizes the thermal expansion force of the thermosetting resin layer and the shape change and recovery effect due to temperature changes of the shape memory resin layer. , writing, reading, and erasing signals.
作用
形状記憶樹脂は一般に、分子構造中に分子架橋や結晶か
らなる固定相と、ある温度以上でゴム状態となりうる可
逆相よりなっている。形状記憶樹脂の形状記憶回復特性
は以下のように説明することができる。Working shape memory resins generally consist of a stationary phase consisting of molecular crosslinks or crystals in their molecular structure, and a reversible phase that can become rubbery at a certain temperature or higher. The shape memory recovery characteristics of shape memory resin can be explained as follows.
形状記憶樹脂をガラス転移温度Ｔｇ （通常は室６ ヘ
ー。Shape memory resin has a glass transition temperature Tg (usually chamber 6).
温より高い）よりもずっと高い温度Ｔ１で成形した後、
室温に冷却すると、樹脂はその形状を１次成形の形状と
して記憶する。その樹脂を１次成形より低い温度におい
て力を加え変形（２次成形）させて室温に冷却すると、
２次成形の形状としてその形状を保持する。さらにこれ
をガラス転移温度よりも高い温度に昇温させると、樹脂
は２次成形の形状から１次成形の形状に回復する。After molding at a temperature T1 much higher than
When cooled to room temperature, the resin remembers its shape as the shape of the primary mold. When the resin is deformed by applying force at a temperature lower than the primary molding (secondary molding) and cooled to room temperature,
The shape is maintained as the shape of the secondary molding. Further, when the temperature is raised to a temperature higher than the glass transition temperature, the resin recovers from the shape of the secondary molding to the shape of the primary molding.
本発明は、形状記憶樹脂のこのような形状記憶と回復特
性を光記録媒体として利用するものである。The present invention utilizes such shape memory and recovery characteristics of shape memory resin as an optical recording medium.
すなわち、予めトラッキングガイド溝が形成されたガラ
ス、ポリカーボネートやポリメチルメタクリレートの基
板上に特定波長（この場合、書込時のレーザ波長λＷ）
のレーザ光を吸収する色素を含有した熱硬化性樹脂を未
硬化の状態で溶剤にとかした溶液を用いて、スピンコー
ド法により製膜し、乾燥硬化させる。さらに、その上に
形状記憶樹脂を溶剤にとかした溶液を用いて、スピンコ
ロ ♂〈−７
−ト法により形状記憶樹脂の塗膜を形成する。この時、
形状記憶樹脂には、特定波長（この場合、消去時のレー
ザ波長λＥ）のレーザ光を吸収する色素を含有している
。さらに、その上に、反射層として金やアルミニウムな
どの金属を真空蒸着などの方法で製膜した後、最上部に
表面保護膜として、例えば紫外線硬化樹脂をスピンコー
ド法などの方法で塗布し、紫外線を照射して硬化させる
。In other words, a specific wavelength (in this case, the laser wavelength λW during writing) is applied to a glass, polycarbonate, or polymethyl methacrylate substrate on which tracking guide grooves have been formed in advance.
A film is formed by a spin cord method using a solution prepared by dissolving an uncured thermosetting resin containing a dye that absorbs laser light in a solvent, and then drying and curing. Furthermore, a coating film of the shape memory resin is formed thereon by the spin-colloid method using a solution prepared by dissolving the shape memory resin in a solvent. At this time,
The shape memory resin contains a dye that absorbs laser light of a specific wavelength (in this case, the laser wavelength λE during erasing). Furthermore, after forming a film of metal such as gold or aluminum as a reflective layer using a method such as vacuum evaporation, for example, an ultraviolet curable resin is applied on top as a surface protective film using a method such as a spin code method. It is cured by irradiating it with ultraviolet light.
以上のようにして得られたものを光記録媒体として供す
る。この光記録媒体に、基板側より、波長λＷのレーザ
光を照射すると、レーザ光は熱硬化性樹脂層に吸収され
、熱硬化性樹脂は瞬時に昇温し膨張する。この時、形状
記憶樹脂もλＷの波長のレーザ光を若干吸収するのと、
熱硬化性樹脂からの熱伝導によりＴｇ以上Ｔ１以下の温
度壕で昇温する。ここで、熱硬化性樹脂の昇温後の弾性
率を形状記憶樹脂のＴｇ以上Ｔ１以下における弾性率よ
りも大きくなるように分子設計された材料をそれぞれに
用いることによシ、形状記憶樹脂層は熱硬化性樹脂層よ
りの応力を受けて変形し、ビッ７／＼−ノ
ドを形成する。形状記憶樹脂は、その変形した状態を２
次成形の形状として記憶する。The material obtained as described above is used as an optical recording medium. When this optical recording medium is irradiated with a laser beam of wavelength λW from the substrate side, the laser beam is absorbed by the thermosetting resin layer, and the thermosetting resin instantaneously heats up and expands. At this time, the shape memory resin also absorbs some laser light with a wavelength of λW,
Due to heat conduction from the thermosetting resin, the temperature rises in a temperature range of Tg or more and T1 or less. Here, by using a material whose molecular design is such that the elastic modulus of the thermosetting resin after temperature rise is larger than the elastic modulus of the shape memory resin at Tg or higher and T1 or lower, the shape memory resin layer is deformed by the stress from the thermosetting resin layer, forming a bit 7/\-nod. Shape memory resin can change its deformed state to 2
It is memorized as the shape of the next molding.
つぎに、この記録ピットの読み出しは、λＲの波長のレ
ーザ光により行なう。λＲは、ＣＤプレーヤーとの互換
性を図るためには７８０ｎｍとする。Next, this recording pit is read out using a laser beam having a wavelength of λR. λR is set to 780 nm for compatibility with CD players.
読み出し時のレーザ光強度は、書込み時のものに比べて
ずつと小さくてよい。また、読み出し時のレーザ光の反
射率はピントのない部分で７ｏ多以上必要である。The laser light intensity during reading may be much smaller than that during writing. Further, the reflectance of the laser beam during readout is required to be 7° or more in the out-of-focus area.
つぎに、消去はλ。の波長のレーザ光により行なう。λ
ＥはλＲと等しくてもよいが、エネルギーはλＲのもの
に比べてずつと大きく形状記憶樹脂層にて選択的に吸収
され、熱硬化性樹脂層では吸収されない。このレーザ光
を吸収した形状記憶樹脂は７ｇ以上Ｔ１以下の温度１で
昇温し初期の１次成形の形状に回復する。すなわち、ピ
ットが消失する。このようにして、信号の書込み、読み
取り、消去が行なわれる。Next, the elimination is λ. This is done using a laser beam with a wavelength of . λ
E may be equal to λR, but the energy is larger than that of λR and is selectively absorbed by the shape memory resin layer and not absorbed by the thermosetting resin layer. The shape memory resin that has absorbed this laser beam is heated at a temperature of 7 g or more and T1 or less, and recovers to the initial primary molded shape. In other words, the pits disappear. In this way, signals are written, read, and erased.
この時、書込み、消去のくり返し特性や、読み出し時の
反射率特性の観点より、熱硬化性樹脂と形状記憶樹脂は
つぎのような特性を満たしていなければならない。At this time, the thermosetting resin and the shape memory resin must satisfy the following characteristics from the viewpoint of repeated writing and erasing characteristics and reflectance characteristics during reading.
熱硬化性樹脂は、λＷのレーザ光を吸収して昇温して熱
膨張するが、その時の熱膨張係数が大きく、耐熱性が高
く、また、λＲのレーザ光に対して透過率が高く、複屈
折率が小さい。また、形状記憶樹脂は、熱硬化性樹脂の
熱膨張により塑性変形を起こし、咬た、複屈折率が小さ
く、熱硬化性樹脂との密着性が小さいことが必要である
。Thermosetting resin absorbs λW laser light, raises its temperature, and thermally expands, but has a large coefficient of thermal expansion at that time, has high heat resistance, and has high transmittance for λR laser light. Low birefringence. Further, the shape memory resin is required to undergo plastic deformation due to thermal expansion of the thermosetting resin, have a low birefringence, and have low adhesion to the thermosetting resin.
このように、熱硬化性樹脂層よび形状記憶樹脂の分子設
計を最適化し、照射するレーザ光の波長およびエネｌレ
ギーとのマツチングを図ることにより、書込み、読み取
り、消去が可能な、書換え可能で、しかも非常に安価な
光デイスク媒体を提供することができる。また、ＣＤの
国際規格であるレッドブックの規格に準拠したディスク
を設計することにより、従来から広く用いられているａ
ｎプレーヤによる再生が可能な光デイスク媒体を提供す
ることができる。In this way, by optimizing the molecular design of the thermosetting resin layer and shape memory resin and matching the wavelength and energy of the irradiated laser light, we have created a rewritable material that can be written, read, and erased. Moreover, it is possible to provide a very inexpensive optical disk medium. In addition, by designing a disc that complies with the Red Book standard, which is an international standard for CDs, we have achieved
It is possible to provide an optical disc medium that can be played by an n-player.
実施例
９ ベージ
（実施例１）
予めトラッキングガイド溝が形成されたガラス基板上に
、ポリアミド樹脂を硬化剤とするエポキシ樹脂にレーザ
光吸収色素としてシアニン系色素を加え、メチルエチル
ケ１−ンに溶解させたものをスピンコード法にて塗布し
、１２０°Ｃで３ｏ分間乾燥し、硬化させて、厚さ７μ
ｍの薄膜を得た。その上に、スチレン−ブタンエン系の
形状記憶樹脂にレーザ光吸収色素としてシアニン系色素
を添加しタモのをトルエンに溶解させ、スピンコード法
にて塗布し、１２０°Ｃで３ｏ分間乾燥させて、厚さ０
．５μｍの形状記憶樹脂の薄膜を形成させた。さらに、
この上に真空蒸着法により、アズレニウムの反射層を厚
さ０．０６μｍ に作威し、さらに、保護コート層とし
て紫外線硬化樹脂をヌピンコ−１・法にて塗布し、紫外
線照射により硬化して２０μｍ厚さのオーバーコート層
を設け、これをブランクディスクとｊ〜で用いる。Example 9 Beige (Example 1) A cyanine dye was added as a laser light absorbing dye to an epoxy resin using a polyamide resin as a curing agent, and dissolved in methyl ethyl carbone on a glass substrate in which a tracking guide groove was formed in advance. The material was coated using a spin code method, dried at 120°C for 30 minutes, and cured to a thickness of 7μ.
A thin film of m was obtained. On top of that, a cyanine dye was added as a laser light absorbing dye to a styrene-butanene shape memory resin, the ash was dissolved in toluene, applied using a spin code method, and dried at 120°C for 30 minutes. Thickness 0
．． A thin film of shape memory resin of 5 μm was formed. moreover,
On top of this, a reflective layer of azulenium was formed to a thickness of 0.06 μm using a vacuum evaporation method, and then an ultraviolet curable resin was applied as a protective coating layer using the Nupinko-1 method and cured by ultraviolet irradiation to a thickness of 20 μm. Provide a thick overcoat layer and use this on the blank disc and j~.
このブランクディスクに、波長８３０ｎｍ 、３０ｍＷ
のレーザ光を２５０ｎＳ照射することにより、１ｏ ・
＼−２
エポキシ樹脂硬化物が昇温熱膨張し、隣接する形状記憶
樹脂に応力を伝達して変形させることによりピットが形
成された。このピットに７８０ｎｍ。This blank disc has a wavelength of 830 nm and a power of 30 mW.
By irradiating 250 nS of laser light, 1o.
\-2 A pit was formed by the cured epoxy resin thermally expanding at elevated temperatures, transmitting stress to the adjacent shape memory resin and deforming it. 780nm to this pit.
３ｍＷのレーザ光を照射することにより、信号を読み取
ることができた。この時のレーザの反射率は、ピットの
有無によりそれぞれ３２％訃よび７３％であった。さら
に、記録されたピット上に、了８０ｎｍ、２０ｍＷのレ
ーザ光を１８０ｎｓ照射することにより、形状記憶樹脂
が７１以上、Ｔ１以下の温度に昇温することにより、ピ
ットを消去することができた。The signal could be read by irradiating it with a 3 mW laser beam. The laser reflectance at this time was 32% and 73%, respectively, depending on the presence or absence of pits. Furthermore, by irradiating the recorded pits with a laser beam of 80 nm and 20 mW for 180 ns, the shape memory resin was heated to a temperature of 71 or higher and T1 or lower, thereby making it possible to erase the pits.
（実施例２）
熱硬化性樹脂として、熱硬化性ポリウレタン樹脂を、ア
ズレニウム系色素とともに、ジメチルホルムアミドで溶
解して塗布し、また、形状記憶樹脂としてポリウレタン
樹脂を用い、アズレニウム系色素をともにジメチルホル
ムアミドに溶解して塗布すること以外は実施例１と同様
にしてブランクデイ７、りを得た。(Example 2) As the thermosetting resin, a thermosetting polyurethane resin was dissolved and applied together with an azulenium dye in dimethylformamide, and a polyurethane resin was used as the shape memory resin, and both the azulenium dye and the azulenium dye were dissolved in dimethylformamide and applied. A blank Day 7 was obtained in the same manner as in Example 1, except that the sample was dissolved in and applied.
この時、熱硬化性樹脂に含ｌれるアズレニウム１１ ・
＼−ノ
系色素と熱硬化性樹脂に含まれるアズレニウム系色素は
、それぞれ８３０ ｎｍと７８０ ｎｍのレーザ光を選
択的に吸収するものである。At this time, azulenium 11 contained in the thermosetting resin
The azulenium-based dye and the azulenium-based dye contained in the thermosetting resin selectively absorb laser light of 830 nm and 780 nm, respectively.
このディスク基板上にａ３ｏｎｍ、３０ｍＷのレーザ光
を２５０ｎＳ照射することにより、実施例１と同様の原
理によりピットを形成し、データを読み取ることができ
た。ピットの有無にょるレーザ光の反射率は、それぞれ
２８％と７０％であった。By irradiating this disk substrate with a laser beam of a3onm and 30mW for 250nS, pits were formed according to the same principle as in Example 1, and data could be read. The reflectance of laser light depending on the presence or absence of pits was 28% and 70%, respectively.
さらに７８０ｎｍ −２０ｍＷのレーザ光を２３０ｎｓ
照射することにより、ピットを消去した。Furthermore, 780nm -20mW laser light is applied for 230ns.
The pits were erased by irradiation.
な釦、実施例１および実施例２の他にも形状記憶樹脂に
なりうる樹脂の構成や、他の熱硬化性樹脂も用いること
ができるし、レーザ光吸収のための他の色素材料など材
料特性とレーザ特性とをマツチさせるように分子設計を
行なったものは、広く用いることができる。In addition to Example 1 and Example 2, resin compositions that can be used as shape memory resins, other thermosetting resins, and materials such as other pigment materials for laser light absorption can also be used. Molecules designed to match the characteristics and laser characteristics can be widely used.
発明の効果
以上の実施例の説明からも明らかなように、本発明によ
れば、安価でユーザが自由にデータを書き換えることが
でき、かつＣＤプレーヤとの互換性の可能性のある光デ
イスク記録媒体を提供することができるので、光デイス
ク記録を民生用に広く普及させることが可能になるとい
う効果が得られ、産業上大きく貢献するものである。Effects of the Invention As is clear from the above description of the embodiments, the present invention provides an optical disk recording system that is inexpensive, allows users to freely rewrite data, and is potentially compatible with CD players. Since the medium can be provided, it is possible to widely popularize optical disc recording for consumer use, which makes a great contribution to industry.
Claims (4)
脂層と、金属反射層と、保護層とを形成してなる光記録
媒体。(1) An optical recording medium in which a thermosetting resin layer, a shape memory resin layer, a metal reflective layer, and a protective layer are formed in this order on a substrate.
ザ光を選択的に吸収する色素を熱硬化性樹脂層および形
状記憶樹脂層に含有させた請求項１記載の光記録媒体。(2) The optical recording medium according to claim 1, wherein the thermosetting resin layer and the shape memory resin layer contain a dye that selectively absorbs laser light of a specific wavelength during writing and erasing, respectively.
記録媒体。(3) The optical recording medium according to claim 1, which uses a substrate on which grooves are formed in advance.
側より行なう請求項１記載の光記録媒体。(4) The optical recording medium according to claim 1, wherein laser irradiation is performed from the substrate side during recording, reproduction, and erasing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2055353A JP2906540B2 (en) | 1990-03-07 | 1990-03-07 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2055353A JP2906540B2 (en) | 1990-03-07 | 1990-03-07 | Optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03256241A true JPH03256241A (en) | 1991-11-14 |
| JP2906540B2 JP2906540B2 (en) | 1999-06-21 |
Family
ID=12996136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2055353A Expired - Fee Related JP2906540B2 (en) | 1990-03-07 | 1990-03-07 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2906540B2 (en) |
-
1990
- 1990-03-07 JP JP2055353A patent/JP2906540B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2906540B2 (en) | 1999-06-21 |
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