JPS5916157A - Optical memory medium - Google Patents
Optical memory mediumInfo
- Publication number
- JPS5916157A JPS5916157A JP57126405A JP12640582A JPS5916157A JP S5916157 A JPS5916157 A JP S5916157A JP 57126405 A JP57126405 A JP 57126405A JP 12640582 A JP12640582 A JP 12640582A JP S5916157 A JPS5916157 A JP S5916157A
- Authority
- JP
- Japan
- Prior art keywords
- melting point
- layer
- inorganic pigment
- thin film
- point alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- 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】
本発明は光学的に情報を記録、再生する光学的メモリ装
置に適用して好適な高感度の光学的メモリ媒体に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly sensitive optical memory medium suitable for application to an optical memory device that optically records and reproduces information.
従来、この種の光学的メモリ媒体としては、ガラスまた
はプラスチック基体上に記録層として例えばＢｆ、Ｔｅ
などの金属薄膜層もしくは無機顔料薄膜層を形成し、集
束レーザ光による溶融蒸発を原理とした凹部（ピント）
を形成して情報を記録する方式のものが使用さ汎てきた
。しかしながら、このような金属薄膜記録層は一般に反
射率が高く、例えばＢｉの場合可視光では約６５Ｘに達
すること、および溶融点が比較的高く、例えばＢｉで２
７１℃。Conventionally, this type of optical memory medium has been prepared by using a recording layer such as Bf, Te, etc. on a glass or plastic substrate.
A recess (focus) formed by forming a metal thin film layer or an inorganic pigment thin film layer, such as
A method of recording information by forming a paper has been widely used. However, such metal thin film recording layers generally have a high reflectance, for example, in the case of Bi, reaching about 65X in visible light, and a relatively high melting point, for example, in the case of Bi, 2
71℃.
Ｔｅで４６０℃であることが原因となり、記録感度が低
く、そのため記録するのに大出力のレーザ装置が必要で
あった。一方、無機顔料薄膜記録層は一般に反射率が低
く低熱伝導率であるが、溶融温度が高いために低いレー
ザ出力では無機顔料薄膜層の溶融、蒸発が困難であり、
したがってレーザビーム照射で生成された凹部は不完全
な形状、例えば非円形状や凹部周辺部の不明確化などが
発生し易く、情報再生時における記録対雑音比（Ｓ／Ｎ
比）を低下させてしまう。この欠点を除去しようとして
レーザビームの出力を太きくしようとすると、レーザビ
ーム装置の大型化がさけられず、また基体や反射層への
レーザビーム貫通による構造破壊をひき起して機能しな
くなる欠点があった。This is caused by the fact that the temperature is 460° C. for Te, and the recording sensitivity is low, so a high output laser device is required for recording. On the other hand, inorganic pigment thin film recording layers generally have low reflectance and low thermal conductivity, but because of their high melting temperature, it is difficult to melt and evaporate the inorganic pigment thin film layer with low laser output.
Therefore, the recesses generated by laser beam irradiation tend to have imperfect shapes, such as non-circular shapes or unclear peripheral areas of the recesses, and the recording-to-noise ratio (S/N) during information reproduction is likely to occur.
ratio). If an attempt is made to increase the output of the laser beam to eliminate this drawback, the size of the laser beam device will inevitably increase, and the laser beam will penetrate into the substrate or reflective layer, causing structural damage and causing it to malfunction. was there.
不発明はこのような現状に鑑みてなされたものであり、
その目的は従来技術の欠点を解消し、低いレーザ出力で
高９１比の記録、再生金可能とする高感度の光学的メモ
リ媒体を提供することにある。The invention was made in view of this current situation,
The purpose is to overcome the drawbacks of the prior art and to provide a highly sensitive optical memory medium that allows high 91 ratio recording and reproduction with low laser power.
不発明の光学的メモリ媒体はあらかじめ反射膜層が設け
られたガラスまたはプラスチック基体上に形成された低
融点合金層と、さらにその上に形成さｎた無機顔料薄膜
記録層で構成され、レーザビームを照射することにより
この無機顔料薄膜記録層および低融点合金層に同時に凹
部を形成することにより情報を記録し、かつ情報を再生
し得るものであり、本発明の特長は低いエネルギー密度
のレーザビームで高いＳ／Ｎ比の情報記録再生が得られ
ることにある。すなわち、レーザビーム照射により無機
顔料薄膜記録層の下部層の低融点合金層がまず溶融蒸発
した際、この浴融部は表面張力により凝集、収縮して凹
部の周辺部が円形状になり易い性質を利用すると共に、
その浴融状の合金層上に溶融蒸発しきれずに残っている
無機顔料薄膜記録層をも同時に四部の周辺部に移動させ
てしまい、この低融点合金層の上記性質によって完全な
円形状の凹部に修正されるために高いＳ／Ｎ比が得られ
るものである。この効果は無機顔料薄膜記録層と低融点
合金層が２層以上の積層で最上部層が無機薄膜記録層の
場合でも同様である。本発明における低融点合金層の融
点は、使用される無機顔料薄膜記録層の融点より充分低
いことが必要であり、この条件が満たさ′ｉ″Ｌないと
本発明の目的が達成されないことになる。また本発明に
おける低融点合金層の組成ばＳｎ、 Ｂｉ、 Ｐｂ、
Ｃｃｌ の内の２種類以上の組合せからなり、必要と
する溶融温度により成分２組成を適宜選択することがで
き、例えば１２．５％５ｎ−ｓｏ、○％Ｂｉ −２５，
０ＸＰｂ −１２，５％Ｃｄ 合金は溶融温度が６０〜
７２℃、１６．０％５ｎ −５２，０％Ｂｉ −３２
，０％Ｐｂ合金は溶融温度が９５℃、４５＋○％５ｎ−
５，０％Ｂｉ −３２，０％Ｐｂ−１８，０％Ｃｄ合金
は溶融温度が１３２〜１３９℃、４３．○％５ｎ−１４
．０ＸＢｉ−４３．０％ｐｂ合金は溶融温度が１４３〜
１６８℃である。こ九らの低融点合金はアルミニウム薄
膜などを反射膜として真空蒸着させた基板上に真空蒸着
またはスパッタリングなどにより容易に形成することが
でき、通常その膜厚は６０〜５００ ｎｍで効果を発揮
することができる。なお、この低融点合金はアルミニウ
ム反射膜と融点が著じるしく異なるため合金化すること
はない。無機顔料薄膜記録層の無機顔料は特に限定され
ず、例えばカーボンブラ、り（黒色系〕、ベンガラ（赤
色系〕、硫化カドミウム（黄色系）、アルミン酸コバル
ト（青色系）などが適用され、基板上に形成された低融
点合金層の上にスパッタリングやイオンブレーティング
法により、あるいは適当な溶剤を用いてスピナー法など
で塗布、乾燥することによ、！２啓易に形成することが
でき、通常その膜厚は低融点合金層の膜厚よりは薄くし
た方が本発明の効果が太きい。The optical memory medium of the invention consists of a low-melting point alloy layer formed on a glass or plastic substrate provided with a reflective film layer in advance, and an inorganic pigment thin film recording layer formed thereon. By irradiating the inorganic pigment thin film recording layer and the low melting point alloy layer with a laser beam, information can be recorded and reproduced by simultaneously forming recesses in the inorganic pigment thin film recording layer and the low melting point alloy layer.The feature of the present invention is that a laser beam with a low energy density Therefore, information recording and reproduction with a high S/N ratio can be obtained. In other words, when the low melting point alloy layer at the bottom of the inorganic pigment thin film recording layer is first melted and evaporated by laser beam irradiation, the melted part of the bath tends to coagulate and contract due to surface tension, making the periphery of the recess easily circular. In addition to using
The inorganic pigment thin film recording layer remaining on the bath-melted alloy layer without being completely melted and evaporated is also moved to the periphery of the four parts at the same time, and due to the above-mentioned properties of this low melting point alloy layer, a perfectly circular recess is formed. Since the signal is corrected, a high S/N ratio can be obtained. This effect is the same even when two or more layers of an inorganic pigment thin film recording layer and a low melting point alloy layer are laminated, and the top layer is an inorganic thin film recording layer. The melting point of the low melting point alloy layer in the present invention must be sufficiently lower than the melting point of the inorganic pigment thin film recording layer used, and unless this condition is met, the object of the present invention will not be achieved. In addition, the composition of the low melting point alloy layer in the present invention is Sn, Bi, Pb,
It consists of a combination of two or more types of Ccl, and the composition of the two components can be appropriately selected depending on the required melting temperature, for example, 12.5% 5n-so, ○% Bi-25,
0XPb-12.5%Cd alloy has a melting temperature of 60~
72°C, 16.0%5n-52.0%Bi-32
,0%Pb alloy has a melting temperature of 95℃, 45+○%5n-
The 5,0% Bi-32,0% Pb-18,0% Cd alloy has a melting temperature of 132-139°C, 43. ○%5n-14
．． 0XBi-43.0%pb alloy has a melting temperature of 143~
The temperature is 168°C. These low melting point alloys can be easily formed by vacuum evaporation or sputtering on a substrate on which a thin aluminum film or the like is vacuum-deposited as a reflective film, and is usually effective at a film thickness of 60 to 500 nm. be able to. Note that this low melting point alloy has a significantly different melting point from that of the aluminum reflective film, so it is not alloyed with the aluminum reflective film. The inorganic pigment of the inorganic pigment thin film recording layer is not particularly limited, and examples include carbon black, red (black), red red (red), cadmium sulfide (yellow), and cobalt aluminate (blue). It can be easily formed on the low melting point alloy layer formed thereon by sputtering or ion blating, or by coating with a spinner method using an appropriate solvent and drying. Generally, the effect of the present invention is greater when the film thickness is thinner than that of the low melting point alloy layer.
次に、本発明における光学的メモリ媒体の構成およびそ
れによる情報の記録、再生操作を図面により説明する。Next, the configuration of the optical memory medium according to the present invention and the information recording and reproducing operations thereof will be explained with reference to the drawings.
第１図は本発明の光学的メモリ媒体を用いた記録、再生
工程の一例を示した系統図であり、第２図（Ａ）、 （
Ｂ）は第１図における記録後の光学的メモリ媒体の一部
を示した拡大断面図である。図において１は基体、２は
反射膜、３は低融点合金層、４は無機顔料薄膜記録層、
６は回転装置、６はレーザ、７は光変調器、８は偏光ビ
ームスプリッタ、９は対物レンズ、１０は光検出器、１
１は記録部となる凹部、１２は未記録部を示す。FIG. 1 is a system diagram showing an example of the recording and reproducing process using the optical memory medium of the present invention, and FIG.
B) is an enlarged sectional view showing a part of the optical memory medium after recording in FIG. 1; In the figure, 1 is a substrate, 2 is a reflective film, 3 is a low melting point alloy layer, 4 is an inorganic pigment thin film recording layer,
6 is a rotation device, 6 is a laser, 7 is an optical modulator, 8 is a polarizing beam splitter, 9 is an objective lens, 10 is a photodetector, 1
Reference numeral 1 indicates a concave portion serving as a recorded portion, and 12 indicates an unrecorded portion.
基体１はガラスまたはポリメチルメタアクリレートのよ
うなグラスチック製の直径約２０確の円板であり、その
片面に反射膜２として例えば約ＳＯＯｎｍのアルミニウ
ム薄膜を真空蒸着により形成し、その上に膜厚５０〜５
００ｎｍの低融点合金層３をスパッタリングし、さらに
その上に膜厚１１００ｎ以下の無機顔料よりなる記録層
４を真空蒸着法。The substrate 1 is a circular plate made of glass or a glass material such as polymethyl methacrylate and has a diameter of about 20 cm. On one side of the substrate, a thin aluminum film of about SOOnm is formed as a reflective film 2 by vacuum evaporation, and a film is formed on it. Thickness 50~5
A low melting point alloy layer 3 with a thickness of 00 nm is sputtered, and a recording layer 4 made of an inorganic pigment with a thickness of 1100 nm or less is further deposited thereon by vacuum evaporation.
スパッタリング法またはスピナー法により形成する。こ
のようにして作製した光学的メモリ媒体を回転装置６に
装着して回転させながら記録、再生が行なわれる。記録
は先ずレーザ６からのレーザ光を光変調器７により変調
して情報を持った光とし、偏光ビームスプリッタ８およ
び対物レンズ９によって集束されたレーザ光のビーム径
は約１μｍであり、その熱作用により低融点合金層３が
溶融蒸発し、同時にこの上層部の記録層４の未蒸発の無
機顔料も四部の周辺部に移動させられ、その結果第２図
（Ａ）、 （ＢＪに示すような凹部１１が形成され情報
が記録される。なお第２図（Ｂ）は低融点合金層３と無
機顔料薄膜記録層４が多層に積層された場合である。記
録された情報の再生はレーザ６におけるレーザ光の出力
を記録時の釣部程度にし、すなわち記録層４の未記録部
１２を浴融蒸発させない程度の出力に下げ、四部１１と
未記録部１２の反射率の違いにより光検出器１０で電気
信号に変換して情報が再生される。Formed by sputtering method or spinner method. The optical memory medium produced in this manner is mounted on a rotating device 6 and recorded and reproduced while being rotated. For recording, first, the laser beam from the laser 6 is modulated by the optical modulator 7 to become light with information, and the beam diameter of the laser beam focused by the polarizing beam splitter 8 and objective lens 9 is about 1 μm, and its heat As a result, the low melting point alloy layer 3 is melted and evaporated, and at the same time, the unevaporated inorganic pigment of the recording layer 4 in the upper layer is also moved to the periphery of the fourth part, as shown in FIGS. 2(A) and (BJ). A concave portion 11 is formed and information is recorded. FIG. 2(B) shows a case where the low melting point alloy layer 3 and the inorganic pigment thin film recording layer 4 are laminated in multiple layers.The recorded information is reproduced using a laser. The output of the laser beam in step 6 is set to about the level of the unrecorded part during recording, that is, the output is lowered to the level that does not cause the unrecorded part 12 of the recording layer 4 to be melted and evaporated. The information is reproduced by converting it into an electric signal in the device 10.
次に本発明の具体的な実施例を説明する。Next, specific examples of the present invention will be described.
（実施例１）
低融点合金層３として５５．５％Ｂｉ −４４，５％ｐ
ｂ合金を膜厚２００ ｎｍにスパッタリングで形成し、
無機顔料記録層４として５％硫化カドミウム溶液を使用
しスピナー法で膜厚約８０ｎｍに形成し、第」図で説明
した方法により光学的メモリ媒体を作製し、出力１５ｍ
ＷのＨｅ −Ｎｅ レーザ光を使用してカラービデオ
信号の記録、再生を行った。(Example 1) 55.5% Bi -44.5%p as low melting point alloy layer 3
Form b alloy to a thickness of 200 nm by sputtering,
An inorganic pigment recording layer 4 was formed using a 5% cadmium sulfide solution to a thickness of approximately 80 nm using a spinner method, and an optical memory medium was fabricated by the method explained in Figure 1, with an output of 15 m.
Color video signals were recorded and reproduced using W He-Ne laser light.
その結果、Ｓ／Ｎ比４５ ｄＢ以上の良好な再生画像品
質が得られた。As a result, good reproduced image quality with an S/N ratio of 45 dB or more was obtained.
（実施例２）
低融点合金層３として１６．０％５ｎ−５２，○％Ｂ１
−３２．○％ｐｂ合金全スパッタリング法で４０Ｃ）ｎ
ｍ形成し、その上に無機顔料記録層４としてカーボンブ
ラックを真空蒸着法で５０ｎｍ形成し、さらに上記組成
の低融点合金層３を２００ｎｍ形成してからその上に同
様にカーボンブラックの無機顔料記録層４を５０ｎｍの
合計４層積層として実施例１と同様の操作により、光学
的メモリ媒体の作製および記録、再生実験を行ったとこ
ろ、実施ｆｌＪ１と略同等の結果を得ることができた。(Example 2) 16.0%5n-52,○%B1 as low melting point alloy layer 3
-32. ○%pb alloy by full sputtering method 40C)n
On top of that, 50 nm of carbon black was formed as an inorganic pigment recording layer 4 by vacuum evaporation, and then a 200 nm thick low melting point alloy layer 3 of the above composition was formed, and then an inorganic pigment recording layer of carbon black was formed on it in the same manner. When an optical memory medium was fabricated and experiments on recording and reproduction were conducted in the same manner as in Example 1 using Layer 4 as a laminate of a total of four layers of 50 nm, substantially the same results as in Example flJ1 were obtained.
（実施例３）
低融点合金層３として４５．○％５ｎ−５．０％Ｂ１−
３２．ＯＸ ｐｂ −１ｓ、ｏ％Ｃａ合金を膜厚２５０
ｎｍにスパッタリングで形成し、その上に酸化鉄（Ｆｅ
２０ｓ ）をスパッタリング法で膜厚６０ｎｍに形成し
、実施例１と同様の操作により光学的メモリ媒体の作製
および記録、再生実験を行ったところ、実施例１と略同
等の結果を得ることができた。(Example 3) As the low melting point alloy layer 3, 45. ○%5n-5.0%B1-
32. OX pb-1s, o%Ca alloy film thickness 250
nm by sputtering, and iron oxide (Fe
20s) was formed to a film thickness of 60 nm using a sputtering method, and an optical memory medium was prepared and experimented with recording and playback using the same operations as in Example 1. As a result, almost the same results as in Example 1 could be obtained. Ta.
以上説明したように、本発明の光学的メモリ媒体は低融
点合金層と無機顔料薄膜記録層との複合膜で構成さ肛て
いるため、低いレーザ出力で情報の記録ができ、再生時
のＳ／Ｎ比も著しるしく向上して高感度とな９、結果と
して、各種メモリ装置の価格を廉価にし得る利点を有す
るものである。As explained above, since the optical memory medium of the present invention is composed of a composite film of a low melting point alloy layer and an inorganic pigment thin film recording layer, information can be recorded with low laser output, and the S The /N ratio is also significantly improved, resulting in high sensitivity.9 As a result, the price of various memory devices can be reduced.
第１図は光学的メモリ媒体を用いた記録、再生工程の系
統図、第２図（Ａ）、 ＣＢ）は第１図における記録後
の光学的メモリ媒体の各側の要部拡大断面図である。
１・・・・・・基体、２・・・・・・反射膜、３・・・
・・低融点合金層、４・・・・・・無機顔料薄膜記録層
、１１・・・・・・凹部、１２−・・・・・未記録部。Figure 1 is a system diagram of the recording and reproducing process using an optical memory medium, and Figures 2 (A) and CB) are enlarged sectional views of main parts on each side of the optical memory medium after recording in Figure 1. be. 1... Base body, 2... Reflective film, 3...
...Low melting point alloy layer, 4...Inorganic pigment thin film recording layer, 11...Recessed portion, 12-...Unrecorded portion.
Claims (3)
光を照射することにより前記無機顔料薄膜層および低融
点合金層に凹部を形成して情報を記録するようにした光
学的メモリ媒体。(1) A substrate on which a reflective layer is formed, and an optical memory in which information is recorded by forming recesses in the inorganic pigment thin film layer and the low melting point alloy layer by irradiating the substrate with laser light. Medium.
層とが交互に合計３層以上積層され、その最外部層が無
機顔料薄膜層からなる特許請求の範囲第（１）項記載の
光学的メモリ媒体。(2) A total of three or more layers of low melting point alloy layers and inorganic pigment thin film layers formed on a substrate are alternately laminated, and the outermost layer is the inorganic pigment thin film layer, as described in claim (1). optical memory medium.
（Ｅｄ （７）内の少なくとも２種類以上を組合せた
合金よシなシ、その溶融温度は無機顔料薄膜層のそれよ
りも低いものである特許請求の範囲第（１）項記載の光
学的メモリ媒体。・(3) The composition of the low melting point alloy layer is Sn, Bi, Pb,
(Ed) The optical memory according to claim (1), wherein the alloy is a combination of at least two or more of (7), and its melting temperature is lower than that of the inorganic pigment thin film layer. Medium.-
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57126405A JPS5916157A (en) | 1982-07-19 | 1982-07-19 | Optical memory medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57126405A JPS5916157A (en) | 1982-07-19 | 1982-07-19 | Optical memory medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5916157A true JPS5916157A (en) | 1984-01-27 |
Family
ID=14934338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57126405A Pending JPS5916157A (en) | 1982-07-19 | 1982-07-19 | Optical memory medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5916157A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS545447A (en) * | 1977-06-14 | 1979-01-16 | Fuji Photo Film Co Ltd | Recording material |
-
1982
- 1982-07-19 JP JP57126405A patent/JPS5916157A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS545447A (en) * | 1977-06-14 | 1979-01-16 | Fuji Photo Film Co Ltd | Recording material |
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