JPH0319063Y2 - - Google Patents
Info
- Publication number
- JPH0319063Y2 JPH0319063Y2 JP1982175553U JP17555382U JPH0319063Y2 JP H0319063 Y2 JPH0319063 Y2 JP H0319063Y2 JP 1982175553 U JP1982175553 U JP 1982175553U JP 17555382 U JP17555382 U JP 17555382U JP H0319063 Y2 JPH0319063 Y2 JP H0319063Y2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- medium
- light absorption
- optical recording
- molecular weight
- 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
Links
- 229920001169 thermoplastic Polymers 0.000 claims description 21
- 239000004416 thermosoftening plastic Substances 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 17
- 230000031700 light absorption Effects 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 239000010408 film Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 239000004793 Polystyrene Substances 0.000 description 4
- 230000009477 glass transition Effects 0.000 description 4
- 229920002223 polystyrene Polymers 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RBTKNAXYKSUFRK-UHFFFAOYSA-N heliogen blue Chemical compound [Cu].[N-]1C2=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=NC([N-]1)=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=N2 RBTKNAXYKSUFRK-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 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
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 229920005588 metal-containing polymer Polymers 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【考案の詳細な説明】
この考案はヒートモードで記録を行なう光記録
用媒体に関するものであり、更に詳しくは、基板
上に光吸収層、さらにその上に熱可塑性層を形成
して得られる媒体の光記録機能を利用した書換え
可能な光記録用媒体に関するものである。[Detailed description of the invention] This invention relates to an optical recording medium that performs recording in heat mode, and more specifically, a medium obtained by forming a light absorption layer on a substrate and a thermoplastic layer on top of the light absorption layer. The present invention relates to a rewritable optical recording medium that utilizes the optical recording function of the present invention.
近年、情報処理の分野において情報の多量化、
多様性の急速な伸びに伴い、一般的な記録方式と
して従来の磁気メモリーでは不十分になりつつあ
り、上記多様性に応じがたい傾向にある。そこ
で、従来のかかる記録方式に代わるものとして、
光記録用媒体を用いた光記録方式が考えられてい
る。かかる光記録方式に用いる媒体の一例として
金属薄膜あるいは金属含有ポリマ材料があるが、
これはレーザビームによつて記録部分の媒体を蒸
着、燃焼させ穴をあける書込み方式であることか
ら、その記録の消去、書換えは不可能である。 In recent years, in the field of information processing, the amount of information has increased,
With the rapid growth in diversity, conventional magnetic memories are becoming insufficient as a general recording method, and tend to be difficult to respond to the above diversity. Therefore, as an alternative to the conventional recording method,
An optical recording method using an optical recording medium is being considered. Examples of media used in such optical recording methods include metal thin films and metal-containing polymer materials.
Since this is a writing method in which a laser beam evaporates and burns the medium in the recording area to create holes, it is impossible to erase or rewrite the recording.
一方、この書換え可能な光記録用媒体の第１の
例としては光磁気材料が知られている。これは磁
気力−効果を用いて読出しを行うが、当効果が小
さいため読出しのＳ／Ｎが非常に悪い。また、均
質な媒体を作製するのが難しい。第２の例として
は非晶質カルコゲナイドのフオトダークニングの
利用があるが、この材料はフオトダークニング感
光波長が短波長であり、使用波長に著しい制限が
ある。第３の例としては熱可塑性ポリマーと光導
電体を組合せた媒体が知られているが、記録時に
コロナ放電、全面加熱が必要であり、簡便でな
く、また感光波長は光導電体によつて制限され
る。 On the other hand, a magneto-optical material is known as a first example of this rewritable optical recording medium. This performs reading using a magnetic force effect, but since this effect is small, the read S/N is very poor. Also, it is difficult to produce a homogeneous medium. A second example is the use of amorphous chalcogenide for photodarkening, but this material is sensitive to photodarkening at short wavelengths, and there are significant limitations on the wavelengths that can be used. As a third example, a medium that combines a thermoplastic polymer and a photoconductor is known, but it requires corona discharge and heating over the entire surface during recording, which is not convenient, and the sensitive wavelength depends on the photoconductor. limited.
このように従来の光記録用媒体は、その多くが
書換え不可能であるとか、あるいは書換えのでき
るものにおいては種々の特性が不十分であるなど
数多くの問題、欠点を免がれないのが実情であ
る。 The reality is that conventional optical recording media have many problems and shortcomings, such as many of them being non-rewritable, and those that are rewritable lacking in various characteristics. It is.
膏案者らはこのような欠点を解決するために多
数の試験研究を行つた結果、ネサガラス等の通電
により発熱し得る電導性ガラスから成る基板上に
反射層と光吸収層と熱可塑性層を積層形成すると
により、くり返し消去および書換え可能な光記録
性が著しく向上すると共に、前記基板をネサガラ
ス等の電導性ガラス基板として、該基板への通
電、発熱により記録の消去を良好に行い得る媒体
を実現したものであり、以下図面を参照しつつこ
の考案を具体的に説明する。 In order to solve these shortcomings, the inventors conducted numerous experiments and researches, and as a result, they developed a method in which a reflective layer, a light-absorbing layer, and a thermoplastic layer are placed on a substrate made of conductive glass, such as Nesa Glass, which can generate heat when electricity is applied. By forming layers, the optical recording properties that can be repeatedly erased and rewritten are significantly improved, and when the substrate is a conductive glass substrate such as Nesa glass, recording can be erased favorably by applying electricity to the substrate and generating heat. This invention has been realized, and this invention will be explained in detail below with reference to the drawings.
第１図はこの考案の光記録用媒体の一実施例を
示す断面図である。この図において、１はネサガ
ラスから成る透明基板、２は光吸収層、３は熱可
塑性層、４は基板１と光吸収層２との間に設けら
れる反射層である。反射層４、光吸収層２、熱可
塑性層３はこの順に基板１上に形成される。反射
層４としては例えばアルミニウムの蒸着膜が用い
られる。また光吸収層２としては銅−フタロシア
ニンの蒸着膜またはカーボンブラツク塗布膜が用
いられる。一方、熱可塑性層３としては膜厚約
1μmのポリスチレン膜をスピンコート法にて形成
した。使用したポリスチレンの分子量は1500〜
500である。 FIG. 1 is a sectional view showing an embodiment of the optical recording medium of this invention. In this figure, 1 is a transparent substrate made of Nesa glass, 2 is a light absorption layer, 3 is a thermoplastic layer, and 4 is a reflective layer provided between the substrate 1 and the light absorption layer 2. The reflective layer 4, the light absorption layer 2, and the thermoplastic layer 3 are formed on the substrate 1 in this order. As the reflective layer 4, for example, a vapor-deposited film of aluminum is used. Further, as the light absorption layer 2, a vapor deposited film of copper-phthalocyanine or a carbon black coating film is used. On the other hand, the thermoplastic layer 3 has a film thickness of approximately
A 1 μm polystyrene film was formed by spin coating. The molecular weight of the polystyrene used is 1500~
It is 500.
この媒体に対しヒートモードで記録の書込みを
行なうが、これはArレーザビームを出力5mW以
下、照射時間2mSで照射することにより、1μm径
程度の微小ピツトを書込むことができた。また、
媒体全体をポリスチレンのガラス転移温度以上に
加熱することにより、記録ピツトの消去をするこ
とができ、冷却後再書込みが可能であつた。しか
も、この実施例において概ね500回以上の消去・
再書込みに十分耐える性能を有していることを確
認した。ピツトの読出しは光吸収率の差、屈折率
の差、反射率の差などで可能であつた。 Recording was performed on this medium in heat mode, and by irradiating it with an Ar laser beam with an output of less than 5 mW and an irradiation time of 2 mS, it was possible to write micro pits with a diameter of about 1 μm. Also,
By heating the entire medium to a temperature higher than the glass transition temperature of polystyrene, the recording pits could be erased and rewritten after cooling. Moreover, in this example, approximately 500 or more erases and
We confirmed that it has sufficient performance to withstand rewriting. It was possible to read pits based on differences in light absorption, refractive index, and reflectance.
この考案における上記の光吸収層２としては、
書込み波長での吸収係数の大きなものが望まし
く、銅−フタロシアニン、カーボンブラツク以外
に、他の金属フタロシアニン、各種色素などがあ
る。熱可塑性層３としては、記録保持温度（室温
など）で十分に硬質であり、かつ比較的ガラス転
移温度が低く、ガラス転移温度以上で十分に軟か
く、容易に塑性流動変形をおこす熱可塑性材料が
望ましい。例としては上述のポリスチレンの他に
ロジンエステル、アクリル樹脂、ポリエチレンな
どのポリマーがあり、比較的低分子量かつ分子量
分布が略単分散であるものが特性が良い。上記ポ
リマーの分子量は1500〜5000が適当である。分子
量が低すぎると室温で軟かく記録の安定保持がで
きない。 The light absorption layer 2 in this invention is as follows:
A material with a large absorption coefficient at the writing wavelength is desirable, and in addition to copper-phthalocyanine and carbon black, other metal phthalocyanines and various pigments may be used. The thermoplastic layer 3 is a thermoplastic material that is sufficiently hard at the recording temperature (room temperature, etc.), has a relatively low glass transition temperature, is sufficiently soft above the glass transition temperature, and easily undergoes plastic flow deformation. is desirable. Examples include polymers such as rosin ester, acrylic resin, and polyethylene in addition to the above-mentioned polystyrene, and those having relatively low molecular weight and substantially monodisperse molecular weight distribution have good properties. The molecular weight of the above polymer is suitably 1500 to 5000. If the molecular weight is too low, it will be soft at room temperature and recording cannot be maintained stably.
次に、この光記録用媒体の書込み、消去原理に
ついて述べる。第２図ａは書込み前の状態で、１
は透明基板、４は反射層、２は光吸収層、３は熱
可塑性層、である。同図ｂに示すようにレーザ光
線５を照射すると、光吸収層２は、熱可塑性層を
通つて直接入射するレーザ光線５及び光吸収層２
を透過して反射層４により反射されてくる一部の
レーザ光線５を吸収して、これによりその温度が
速やかに上昇する。それにより、熱可塑性層３の
温度も上昇しガラス転移温度以上になり、同図ｃ
のように熱可塑性層３が軟化し、凹みができる。
そして、すぐに冷却され、凹みは室温で安定に残
る。このようにして形成された凹み（書込みピツ
ト）は光吸収率の差、屈折率の差などで検出可能
であるし、表面反射の違いでも検出できる。ま
た、基板１と光吸収層２の間に反射層４を形成し
たことにより、反射光の違いとしても検出でき
る。一方、媒体全体を加熱することにより熱可塑
性層３全体が軟化し、同図ｄに示すように凹みを
埋め全体が平坦な膜に戻る。すなわち、書込みピ
ツトの消去が行われる。この消去における前記加
熱方法は、ネサガラス等の通電により発熱し得る
電導性ガラスから成る透明基板１に外部電源（図
示せず）より電流を流すことによる抵抗加熱によ
り行う。この通電による基板１の発熱により、媒
体全体が加熱され、これにより熱可塑性層３もそ
の全面が一様に加熱されて軟化（塑性流動変形）
し、その表面が平坦化して記録の消去が行なわれ
る。なお、先の書込みにおけるレーザパワーが大
きすぎると熱可塑性層３または光吸収層２の破壊
がおこり、上記消去が不可能になる。 Next, the writing and erasing principles of this optical recording medium will be described. Figure 2a shows the state before writing, 1
is a transparent substrate, 4 is a reflective layer, 2 is a light absorption layer, and 3 is a thermoplastic layer. When the laser beam 5 is irradiated as shown in FIG.
A portion of the laser beam 5 transmitted through the reflective layer 4 and reflected by the reflective layer 4 is absorbed, thereby causing its temperature to rise rapidly. As a result, the temperature of the thermoplastic layer 3 also rises to a temperature higher than the glass transition temperature, and as shown in Fig.
The thermoplastic layer 3 is softened and a depression is formed as shown in FIG.
It is then quickly cooled down and the depression remains stable at room temperature. The depressions (writing pits) thus formed can be detected by differences in light absorption, refractive index, etc., and can also be detected by differences in surface reflection. Further, by forming the reflective layer 4 between the substrate 1 and the light absorption layer 2, it is also possible to detect a difference in reflected light. On the other hand, by heating the entire medium, the entire thermoplastic layer 3 is softened, filling the dents and returning the entire film to a flat film, as shown in FIG. In other words, the written pits are erased. The heating method for erasing is performed by resistance heating by passing a current from an external power source (not shown) through the transparent substrate 1 made of conductive glass such as Nesa glass which can generate heat when energized. The heat generated by the substrate 1 due to this energization heats the entire medium, thereby uniformly heating the entire surface of the thermoplastic layer 3 and softening it (plastic flow deformation).
Then, the surface becomes flat and the recording is erased. Note that if the laser power in the previous writing is too large, the thermoplastic layer 3 or the light absorption layer 2 will be destroyed, making the above erasing impossible.
以上詳述したようにこの考案の光記録用媒体
は、基板上に反射層、光吸収層、熱可塑性層をこ
の順に形成したので、レーザ光による反復性の大
きな繰返し高速書込みおよび消去が可能となる。
しかも、レーザ光照射加熱により記録を行うので
非常に微小な記録が可能となり、従来の磁気記録
に代り得る高密度記録媒体として利用できる効果
がある。また、本考案の媒体は、基板を導電性ガ
ラスとし、該基板へ通電し発熱させることにより
熱可塑性層を軟化（塑性流動変形）させて記録の
消去を行うものであるため、消去を容易かつ良好
に行い得る。さらに、本考案の媒体は、記録層
（熱可塑性層）と光吸収層を分離したために、熱
可塑性層の硬化←→軟化による劣化が非常に少い。
一方、３層とせずに、熱可塑性層内に光吸収体を
混合させたものは、硬化合←→軟化のくり返しに
より不均一化、光吸収体の分解、劣化がおきる可
能性が大きく、感度低下、くり返し特性劣化をき
たす。また、この考案の光記録用媒体によれば、
熱可塑性層として分子量が1500〜5000で且つ分子
量分布が略単分散のポリマーを使用することで感
度、高速書込み性もよく、くり返し特性はさらに
非常にすぐれる。さらに、この考案の媒体は塗布
などの方法だけでも形成でき、非常にコストを下
げることができ、かつ大型化も容易である。さら
に上述のように消去性が良いので、再書込みも良
好に行い得る。 As detailed above, the optical recording medium of this invention has a reflective layer, a light absorbing layer, and a thermoplastic layer formed on the substrate in this order, making it possible to perform high-speed writing and erasing with a large degree of repeatability using a laser beam. Become.
Furthermore, since recording is performed by laser beam irradiation and heating, extremely minute recording is possible, and this has the advantage that it can be used as a high-density recording medium that can replace conventional magnetic recording. In addition, the medium of the present invention uses conductive glass as the substrate, and the thermoplastic layer is softened (plastic flow deformation) by applying electricity to the substrate to generate heat, thereby erasing records. It can be done well. Furthermore, in the medium of the present invention, since the recording layer (thermoplastic layer) and the light absorption layer are separated, there is very little deterioration due to hardening←→softening of the thermoplastic layer.
On the other hand, if a light absorber is mixed in the thermoplastic layer instead of three layers, there is a high possibility that non-uniformity, decomposition and deterioration of the light absorber will occur due to repeated curing and softening, and sensitivity This results in repeated deterioration of characteristics. Furthermore, according to the optical recording medium of this invention,
By using a polymer having a molecular weight of 1,500 to 5,000 and a substantially monodisperse molecular weight distribution as the thermoplastic layer, sensitivity and high-speed writing properties are good, and the repeatability is also very good. Furthermore, the medium of this invention can be formed simply by a method such as coating, which can greatly reduce costs and can easily be made large. Furthermore, as mentioned above, since erasability is good, rewriting can be performed satisfactorily.
第１図はこの考案の光記録用媒体の一実施例を
示す断面図、第２図は前記一実施例の媒体に対す
る書込みおよび消去を説明するための断面図であ
る。
１……透明基板、２……光吸収層、３……熱可
塑性層、４……反射層、５……レーザ光。
FIG. 1 is a sectional view showing an embodiment of the optical recording medium of this invention, and FIG. 2 is a sectional view for explaining writing and erasing on the medium of the embodiment. DESCRIPTION OF SYMBOLS 1...Transparent substrate, 2...Light absorption layer, 3...Thermoplastic layer, 4...Reflection layer, 5...Laser light.
Claims (1)
光を照射することによりヒートモードで記録の書
込みを行なう光記録用媒体であつて、通電により
発熱し得る電導性ガラスから成る基板上に、反射
層と、前記書込み波長での吸収係数の大きい光吸
収材料から成る光吸収層と、分子量が1500〜5000
で且つ分子量分布が略単分散のポリマーから成る
熱可塑性層とをこの順に備えたことを特徴とする
光記録用媒体。 An optical recording medium that is rewritable and performs recording in a heat mode by irradiating a laser beam light of a predetermined wavelength, the medium having a reflective layer on a substrate made of conductive glass that can generate heat when energized. a light absorption layer made of a light absorption material with a large absorption coefficient at the writing wavelength and a molecular weight of 1500 to 5000;
and a thermoplastic layer made of a polymer having a substantially monodisperse molecular weight distribution, in this order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982175553U JPS5982342U (en) | 1982-11-22 | 1982-11-22 | optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982175553U JPS5982342U (en) | 1982-11-22 | 1982-11-22 | optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5982342U JPS5982342U (en) | 1984-06-04 |
| JPH0319063Y2 true JPH0319063Y2 (en) | 1991-04-23 |
Family
ID=30381906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982175553U Granted JPS5982342U (en) | 1982-11-22 | 1982-11-22 | optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5982342U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060072438A1 (en) * | 2002-09-30 | 2006-04-06 | Seiji Nishino | Optical information recording substrate and recording/reproducing device using it |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133039A (en) * | 1977-04-26 | 1978-11-20 | Canon Inc | Recording method |
| JPS5426374A (en) * | 1977-07-29 | 1979-02-27 | Tokyo Electric Co Ltd | Crusher for beans |
| JPS57167149A (en) * | 1981-04-07 | 1982-10-14 | Tdk Corp | Optical recording medium |
| JPS58121152A (en) * | 1982-01-12 | 1983-07-19 | Dainippon Ink & Chem Inc | Optical recording medium |
-
1982
- 1982-11-22 JP JP1982175553U patent/JPS5982342U/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133039A (en) * | 1977-04-26 | 1978-11-20 | Canon Inc | Recording method |
| JPS5426374A (en) * | 1977-07-29 | 1979-02-27 | Tokyo Electric Co Ltd | Crusher for beans |
| JPS57167149A (en) * | 1981-04-07 | 1982-10-14 | Tdk Corp | Optical recording medium |
| JPS58121152A (en) * | 1982-01-12 | 1983-07-19 | Dainippon Ink & Chem Inc | Optical recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5982342U (en) | 1984-06-04 |
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