JPS63188090A - Optical recording and reproducing method - Google Patents
Optical recording and reproducing methodInfo
- Publication number
- JPS63188090A JPS63188090A JP62018388A JP1838887A JPS63188090A JP S63188090 A JPS63188090 A JP S63188090A JP 62018388 A JP62018388 A JP 62018388A JP 1838887 A JP1838887 A JP 1838887A JP S63188090 A JPS63188090 A JP S63188090A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- layer
- wavelength
- absorption
- light
- 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
- 238000000034 method Methods 0.000 title claims description 14
- 230000003287 optical effect Effects 0.000 title claims description 9
- 239000010410 layer Substances 0.000 claims abstract description 89
- 239000002356 single layer Substances 0.000 claims abstract description 4
- 230000031700 light absorption Effects 0.000 claims description 31
- 238000000862 absorption spectrum Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 3
- 239000000126 substance Substances 0.000 claims 2
- 239000000463 material Substances 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract description 4
- 239000000975 dye Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 6
- 230000002411 adverse Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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
- G11B7/242—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
- G11B7/244—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 organic materials only
- G11B7/246—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 organic materials only containing dyes
-
- 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
- G11B7/244—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 organic materials only
- G11B7/246—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 organic materials only containing dyes
- G11B2007/24618—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 organic materials only containing dyes two or more dyes in two or more different layers, e.g. one dye absorbing at 405 nm in layer one and a different dye absorbing at 650 nm in layer two
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、レーザ光などの光ビームによって、アナログ
信号やディジタル信号をリアルタイムで記録することが
可能な情報の記録・再生方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information recording and reproducing method that allows analog signals and digital signals to be recorded in real time using a light beam such as a laser beam. .
従来、記録レーザ光の波長を変えることによって記録媒
体上の同一場所に多重記録を行う記録媒体の情報読み出
し方法として、透過光で読み出す方法と反射光で読み出
す方法が知られていた。BACKGROUND ART Conventionally, as methods for reading information from a recording medium in which multiplex recording is performed at the same location on a recording medium by changing the wavelength of a recording laser beam, there have been known methods for reading information using transmitted light and methods for reading using reflected light.
このうち反射光で読み出す方法は、読み出し用の光学系
がディスクの片側だけに有ればよく、そのため光学ヘッ
ドの軽量化、ひいては情報のアク高いので、従来の反射
光で読み出す方法では記録膜に近接して反射率の高い層
（反射層と呼ぶ）を設け、記録膜を透過した光をそこで
反射させ、再び記録膜内を通して光入射側へ戻す方法が
とられていた。Among these methods, the method of reading using reflected light requires that the reading optical system be located only on one side of the disk, which reduces the weight of the optical head and makes the information more expensive. A method has been used in which a layer with a high reflectance (referred to as a reflective layer) is provided in close proximity to the recording film, and the light that has passed through the recording film is reflected there, and then passed through the recording film and returned to the light incident side.
この場合、記録時においてもレーザ光は反射層にて反射
されることとなる。In this case, the laser beam will be reflected by the reflective layer even during recording.
尚、この例として１反射層にＡＱを用いたものが１９８
６年春季応用物理学会講演予稿集ｐ、４４２゜講演番号
４ｐ−Ｂ−１に記述されている。In addition, as an example of this, one using AQ for one reflective layer is 198
It is described in Proceedings of the 6th Spring Conference of the Japan Society of Applied Physics, page 442゜Lecture number 4p-B-1.
上記従来技術では、基板−ヒに記録膜とは別に反射層を
形成する必要があるため、記録媒体の生産工程が一つ余
分に増えるという問題がある。In the above-mentioned prior art, since it is necessary to form a reflective layer on the substrate separately from the recording film, there is a problem in that the number of production steps for the recording medium increases by one.
また、記録の書き込みおよび消去時においても。Also when writing and erasing records.
現在多く用いられている発熱を利用する記録媒体では、
反射層の熱伝導による熱の損失のために高いレーザパワ
ーを必要とするという問題があった。Recording media that utilize heat generation, which is currently widely used,
There is a problem in that high laser power is required due to heat loss due to thermal conduction in the reflective layer.
本発明の目的は、上記従来技術の問題点を解消し、生産
工程が少なく、書き込みおよび消去時のレーザパワーの
低い、情報の記録・再生・消去方法を提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for recording, reproducing, and erasing information that eliminates the problems of the prior art described above, requires fewer production steps, and uses low laser power during writing and erasing.
上記目的は、記録膜自身からの反射光を読み出しに利用
し、記録膜に近接した反射層を設けないことにより達成
される。The above object is achieved by using reflected light from the recording film itself for reading and by not providing a reflective layer close to the recording film.
記録膜は単層であると多層であるとを問わないが、記録
膜が多層より成る場合には、他の層の読み出しに用いる
波長での光吸収が最も少ない層を最も光入射側に近いと
ころに配置し、以下、吸収の少ない順に配列するのが好
ましい。It does not matter whether the recording film is single layer or multilayer, but if the recording film is multilayer, the layer that absorbs the least amount of light at the wavelength used for reading other layers is the layer closest to the light incident side. It is preferable to arrange them in order of decreasing absorption.
さらに、記録膜が多層より成る場合は、各記録層間に中
間層を設けるのも好ましい。各中間層は、各記録層の記
録光・再生光のすべてに対して透過率が高くてもよいが
、その中間層よりも光入射側にある記録層の記録光・再
生光に対する透過率よりも光入射側と反対側にある記録
層の記録光・再生光に対する透過率が高いものとするの
がより好ましい。Furthermore, when the recording film is composed of multiple layers, it is also preferable to provide an intermediate layer between each recording layer. Each intermediate layer may have a higher transmittance for all of the recording light and reproducing light of each recording layer, but the transmittance for the recording light and reproducing light of the recording layer on the light incident side of the intermediate layer may be higher. It is more preferable that the recording layer on the side opposite to the light incident side has a high transmittance for recording light and reproducing light.
波長多重記録媒体は一般に光透過率が高いが、記録膜自
身が全く光紮反射しないわけではない。Although wavelength multiplexing recording media generally have high light transmittance, this does not mean that the recording film itself does not reflect light at all.
その反射率は数％から十数％である。Its reflectance is from several percent to more than ten percent.
従来は、記録膜自身のこの程度の反射率では反射光によ
る読み出しは不可能と考えられ、当然のごとく反射層が
設けられていたが、本発明では記録膜自身で反射した光
を読み出しに用いる。Conventionally, it was thought that reading by reflected light was impossible with this level of reflectance of the recording film itself, and a reflective layer was naturally provided, but in the present invention, the light reflected by the recording film itself is used for reading. .
それによって、記録膜とは別に反射層を形成する工程が
不要となる。This eliminates the need for a step of forming a reflective layer separately from the recording film.
さらに反射層がないので、従来反射層において熱伝導の
ために生じていた損失を生じない。Furthermore, since there is no reflective layer, there is no loss that conventionally occurs due to heat conduction in reflective layers.
記録膜が多層より成る場合において、他の層の読み出、
しに用いる波長での光吸収が最も少ない層を最も光入射
側に近いところに配置し、以下、吸収の少ない順に配列
すると、光入射側から遠い層の読み出し時に、光入射側
に近い層の光吸収による光量の減衰を抑えるように働く
。When the recording film consists of multiple layers, reading out other layers,
If you arrange the layer with the least amount of light absorption at the wavelength used for the light incident closest to the light incidence side, and then arrange the layers in descending order of absorption, when reading out the layer farthest from the light incidence side, the layer closest to the light incidence side will Works to suppress the attenuation of light intensity due to light absorption.
さらに多層から成る各記録層間に中間層を設けると、膜
形成時あるいは記録・再生・消去時の記録層相互の干渉
による悪影響を避けることができる。Furthermore, if an intermediate layer is provided between each of the multilayer recording layers, it is possible to avoid adverse effects caused by mutual interference between the recording layers during film formation or during recording, reproduction, and erasing.
（実施例１） 本発明の第１の実施例を第１図により説明する。 (Example 1) A first embodiment of the present invention will be described with reference to FIG.
本実施例における記録膜は単層膜である。The recording film in this example is a single layer film.
基板１上に記録膜として記録層２を形成する。A recording layer 2 is formed as a recording film on a substrate 1.
この記録層２は、波長５３０ｎｍ、６５．Ｏｎｍ。This recording layer 2 has a wavelength of 530 nm and a wavelength of 65. Onm.
７８０ｎｍの３つの光吸収の極大値を有するように形成
された混合膜である。具体的には、上記、各波長におい
て光吸収の極大値を生じさせるような色素を混合して成
るものである。尚、一般に、光吸収率が高い波長の光に
対しては光反射率も高い。This is a mixed film formed to have three maximum values of light absorption at 780 nm. Specifically, it is made by mixing dyes that produce the maximum value of light absorption at each of the wavelengths mentioned above. Note that, in general, light reflectance is also high for light having a wavelength with high light absorption.
混合膜の光吸収スペクトルにおいては各色素の光吸収の
極大値ははっきりせず、幅が広く、波長に対してゆるや
かに吸収が変化するスペク、トルとなっている。In the light absorption spectrum of the mixed film, the maximum value of the light absorption of each dye is not clear, and the spectrum is wide and the absorption changes gradually with wavelength.
こうしてでき上った記録媒体への情報の記録は次のよう
にして行った。Information was recorded on the recording medium thus created in the following manner.
記録媒体を高速で回転させ、まず５３０ｎｍに近い波長
のレーザを情報信号に従って強度変調して照射した。こ
れにより記録層２の強いレーザ光が当った場所では、記
録層中の５３Ｑｎｍの波長に対して吸収極大値を生じさ
せる色素が変化し、記録が行われた。強いレーザ光の当
った部分の５３０ｎｍの波長に対して吸収極大値を生じ
させる色素以外の色素および強いレーザ光の当らなかっ
た部分の各色素には、はとんど変化は起らなかった。The recording medium was rotated at high speed, and first a laser beam having a wavelength close to 530 nm was irradiated with the intensity modulated according to the information signal. As a result, in the areas of the recording layer 2 that were hit by the strong laser beam, the dye in the recording layer that produced the maximum absorption value at a wavelength of 53 Qnm changed, and recording was performed. There was almost no change in the dyes other than the dye that produced a maximum absorption value at a wavelength of 530 nm in the area that was irradiated with the strong laser beam and in the dyes in the area that was not irradiated with the intense laser beam.
同様にして他の２つの波長でもそれぞれ記録を行なった
。Recording was also performed at the other two wavelengths in the same manner.
次に情報の読み出しは次のよ、うにして行なった。Next, information was read out as follows.
例えば波長５３０ｎｍで記録された情報を読み出す場合
、同じく波長５３０ｎｍのレーザ光を記録時よりも低い
パワーで照射し、記録層からの反射光強度の強弱を検出
した。記録が行われている部分では反射光強度は弱く、
記録が行われていない部分では強い。読み出しレーザ光
は記録レーザ光と全く同じ波長である必要は無く、少し
異なった波長でも良い。For example, when reading information recorded at a wavelength of 530 nm, a laser beam having a wavelength of 530 nm was irradiated with a power lower than that during recording, and the intensity of the reflected light from the recording layer was detected. The intensity of reflected light is weak in the area where recording is being performed.
It is strong in areas where recording is not done. The reading laser beam does not have to have exactly the same wavelength as the recording laser beam, and may have a slightly different wavelength.
ところで、この記録媒体の場合、記録レーザ光の照射に
よって記録層が変化すると、別の波長に新たに光吸収が
生ずる。この新たに生ずる光吸収の波長は、記録レーザ
光の波長に対応して各々異なるので、この光吸収の有無
を検出することによって読み出しを行なうこともできる
。また、この読み出し光のパワーを高くして照射するこ
とにより、消去も可能である。By the way, in the case of this recording medium, when the recording layer changes due to irradiation with the recording laser beam, light absorption newly occurs at a different wavelength. Since the wavelength of this newly generated light absorption differs depending on the wavelength of the recording laser beam, reading can also be performed by detecting the presence or absence of this light absorption. Furthermore, erasing is also possible by irradiating the readout light with a high power.
尚、記録レーザ光照射によってその波長の吸収が増加す
る記録膜も使用可能である。Note that it is also possible to use a recording film whose absorption of the wavelength increases when irradiated with a recording laser beam.
また、記録膜として、広い波長範囲にわたって光吸収が
あり、光照射によってその一部の吸収が減少あるいは増
加するものも使用可能である。Furthermore, it is also possible to use a recording film that absorbs light over a wide wavelength range and whose absorption decreases or increases in part when irradiated with light.
（実施例２）
本発明の第２の実施例を第２図および第３図により説明
する０本実施例における記録膜は多層膜である。(Example 2) A second example of the present invention will be explained with reference to FIGS. 2 and 3. The recording film in this example is a multilayer film.
第２図に示すように基板３上に３つの記録層４゜６．８
および中間層５．７を順次に形成する。ここで記録層４
は波長５３０ｎｍ、６は６５０ｎｍ、８は７８０ｎｍに
それぞれ光吸収の極大値を持つものであり、具体的には
上記各波長において光吸収の極大値を生じさせるような
各色素から成るものである。As shown in FIG. 2, three recording layers 4°6.8
and intermediate layer 5.7 are formed in sequence. Here recording layer 4
has a maximum value of light absorption at a wavelength of 530 nm, 6 has a maximum value of light absorption at a wavelength of 650 nm, and 8 has a maximum value of light absorption at a wavelength of 780 nm.Specifically, each dye has a maximum value of light absorption at each of the above-mentioned wavelengths.
ところで第３図に示すように、いずれの記録層も、光吸
収の極大値よりも長波長側での光吸収の方が短波長側で
の光吸収よりも少ない、特に極大値より５０ｎｍ以上波
長の長い光に対しては極めて光吸収が少ない。このため
、他の層の読み出しに用いる波長での光吸収が最も少な
い層（ここでは記録層４）を最も光入射側に近いところ
に配置し、以下、吸収の少ない順（記録層６．記録層８
の順）に配列している。こうすることにより、光入射側
から遠い層の読み出し時に、光入射側に近い層の光吸収
による光量の減衰を防ぐことができる。By the way, as shown in Figure 3, in both recording layers, the light absorption on the longer wavelength side than the maximum value of light absorption is less than the light absorption on the short wavelength side, especially at wavelengths 50 nm or more below the maximum value. Light absorption is extremely low for long light. For this reason, the layer that absorbs the least amount of light at the wavelength used for reading other layers (recording layer 4 in this case) is placed closest to the light incident side, and then the layer that absorbs the least amount of light (recording layer 6. layer 8
). By doing so, when reading a layer far from the light incidence side, it is possible to prevent attenuation of the amount of light due to light absorption in a layer close to the light incidence side.
また、各中間層５，７も色素を含有し、各々その中間層
よりも光入射側の記録層の吸収波長の光の透過率より、
反対側の記報層の吸収波長の光の透過率の方が高い性質
のものとした。こうすることにより記録・再生時の記録
相互の干渉による悪影響を避けることができ、いわゆる
クロストークを小さくすることができる。Further, each of the intermediate layers 5 and 7 also contains a dye, and from the transmittance of light at the absorption wavelength of the recording layer on the light incident side of the intermediate layer,
The recording layer on the opposite side has a higher transmittance for light having an absorption wavelength. By doing so, it is possible to avoid the adverse effects caused by mutual recording interference during recording and reproduction, and it is possible to reduce so-called crosstalk.
このような多層膜の記録媒体への情報の記録は次のよう
にして行った。Information was recorded on the multilayer recording medium in the following manner.
記録媒体を高速で回転させ、記録層４が光吸収極大値と
なる５３０ｎｍに近い波長のレーザ光を情報信号に従っ
て強度変調し、記録層４に集光して照射した。記録層４
の強いレーザ光が当った場所では、記録層４の色素が変
化してレーザ光の波長の光吸収が減少し、記録が行われ
た。強いレーザ光の当らなかった部分の色素には、はと
んど変化は起らなかった。同様にして他の記録層にも、
それぞれの光吸収が極大となる波長に近い波長のレーザ
光で順次記録を行った。The recording medium was rotated at high speed, and a laser beam having a wavelength close to 530 nm, at which the recording layer 4 has a maximum light absorption value, was intensity-modulated according to the information signal, and the recording layer 4 was focused and irradiated. Recording layer 4
At the location where the intense laser light was applied, the dye in the recording layer 4 changed and light absorption at the wavelength of the laser light decreased, and recording was performed. There was almost no change in the pigment in the areas that were not hit by the strong laser light. Similarly, for other recording layers,
Recording was performed sequentially using a laser beam with a wavelength close to the wavelength at which each light absorption was at its maximum.
次に情報の読み出しは次のようにして行った。Next, information was read out as follows.
例えば記録層４から情報を読み出す場合、記録層４に記
録を行ったのと同じ波長であ菖波長５３０ｎｍのレーザ
光を記録時よりも低いパワーで照射し、記録層４からの
反射光強度の強弱を検出した。For example, when reading information from the recording layer 4, a laser beam with a wavelength of 530 nm, which is the same as that used for recording on the recording layer 4, is irradiated with a lower power than during recording, and the intensity of the reflected light from the recording layer 4 is reduced. Detected strength and weakness.
記録の行われている部分で反射光強度が弱く、記録が行
われていない部分で強いのは実施例１と同様である。As in Example 1, the intensity of the reflected light is weak in the recorded area and strong in the unrecorded area.
本実施例のような記録層配列順序によると、層６又は層
８の読み出し時に層４の、また１層８の読み出し時に層
４および層６の光吸収による光の減衰やノイズの発生を
避けることができるという効果がある。According to the arrangement order of the recording layers as in this embodiment, it is possible to avoid light attenuation and noise generation due to light absorption in layer 4 and layer 6 when reading out layer 6 or layer 8, and layer 4 and layer 6 when reading out layer 8. It has the effect of being able to
また、本実施例においても、実施例１で述べた記録層の
変化によって別の波長に新たな光吸収を生ずることや、
レーザ光照射によってその波長の吸収が増加する記録膜
も使用可能であることは同様である。In addition, in this example, new light absorption occurs at a different wavelength due to the change in the recording layer described in Example 1,
Similarly, it is also possible to use a recording film whose absorption of the wavelength increases when irradiated with laser light.
尚、本実施例では、多層膜を構成する各層はそれぞれ単
一の光吸収の極大値を持つものであるが、この各層を実
施例１のような複数の光吸収の極大値を持つものとする
ことも可能である。In this example, each layer constituting the multilayer film has a single maximum value of light absorption, but each layer may have a plurality of maximum values of light absorption as in Example 1. It is also possible to do so.
以上２つの実施例ではディジタル信号の記録について述
べたが、アナログ信号（ＡＭ信号やＦＭ信号）について
も本発明が適用ができることはいうまでもない。アナロ
グ信号の記録では、照射されるレーザ光の強度に応じて
照射後の記録膜の光吸収の程度が異なる。In the above two embodiments, recording of digital signals has been described, but it goes without saying that the present invention can also be applied to analog signals (AM signals and FM signals). In recording analog signals, the degree of light absorption of the recording film after irradiation varies depending on the intensity of the irradiated laser light.
本発明によれば、記録媒体の生産工程において反射層を
形成する必要がないため、生産工程を減らすことができ
るという効果がある。According to the present invention, there is no need to form a reflective layer during the production process of a recording medium, so there is an effect that the number of production processes can be reduced.
また、発熱を利用して書き込み・消去を行なう場合に平
熱伝導による反射層での損失がないため、書き込み・消
去のためのレーザパワーが従来よりも小さくてよいとい
う効果がある。Further, when writing and erasing are performed using heat generation, there is no loss in the reflective layer due to normal thermal conduction, so there is an effect that the laser power for writing and erasing can be lower than that of the conventional method.
第１図は本発明の第１の実施例における記録媒体の構造
を示す断面図、第２図は本発明の第２の実施例における
記録媒体の構造を示す断面図である。
第３図は第２の実施例における各記録層の波長に対する
光吸収の特性を示す概念図である。FIG. 1 is a sectional view showing the structure of a recording medium in a first embodiment of the invention, and FIG. 2 is a sectional view showing the structure of a recording medium in a second embodiment of the invention. FIG. 3 is a conceptual diagram showing the light absorption characteristics of each recording layer with respect to wavelength in the second embodiment.
Claims (1)
以上の物質の複合膜を記録媒体として用いる光記録装置
において、上記２種類以上の物質からの反射光を情報の
読み出しに利用することを特徴とする光記録および再生
方法。 ２、上記複合膜が単層膜であり、かつ異なつた光吸収の
極大値を持つ複数の材料の混合膜であることを特徴とす
る特許請求の範囲第１項記載の光記録および再生方法。 ３、上記複合膜が多層膜であることを特徴とする特許請
求の範囲第１項記載の光記録および再生方法。 ４、上記多層膜のうちで光吸収の極大波長が最も短い層
を最も光入射側に近いところに配置し、以下順に極大波
長の短い順に配列してなることを特徴とする特許請求の
範囲第３項記載の光記録および再生方法。 ５、上記多層膜の間に中間層を設けたことを特徴とする
特許請求の範囲第３項又は第４項記載の光記録および再
生方法。[Scope of Claims] 1. In an optical recording device that uses a composite film of two or more types of substances having at least partially different light absorption spectra as a recording medium, reflected light from the two or more types of substances is used for reading information. An optical recording and reproducing method characterized by using 2. The optical recording and reproducing method according to claim 1, wherein the composite film is a single layer film, and is a mixed film of a plurality of materials having different maximum values of light absorption. 3. The optical recording and reproducing method according to claim 1, wherein the composite film is a multilayer film. 4. Among the multilayer films, the layer with the shortest maximum wavelength of light absorption is disposed closest to the light incident side, and the layers are arranged in descending order of maximum wavelength. The optical recording and reproducing method according to item 3. 5. The optical recording and reproducing method according to claim 3 or 4, characterized in that an intermediate layer is provided between the multilayer films.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62018388A JP2796288B2 (en) | 1987-01-30 | 1987-01-30 | Recording medium, its optical reproducing method and optical reproducing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62018388A JP2796288B2 (en) | 1987-01-30 | 1987-01-30 | Recording medium, its optical reproducing method and optical reproducing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63188090A true JPS63188090A (en) | 1988-08-03 |
| JP2796288B2 JP2796288B2 (en) | 1998-09-10 |
Family
ID=11970329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62018388A Expired - Fee Related JP2796288B2 (en) | 1987-01-30 | 1987-01-30 | Recording medium, its optical reproducing method and optical reproducing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2796288B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0385344A2 (en) * | 1989-02-27 | 1990-09-05 | Matsushita Electric Industrial Co., Ltd. | Optical storage media |
| JPH03157816A (en) * | 1989-11-15 | 1991-07-05 | Matsushita Electric Ind Co Ltd | Optical information recording member and optical information recording and reproducing device |
| JP2002117585A (en) * | 2000-06-09 | 2002-04-19 | Tdk Corp | Optical information medium |
| WO2004070714A1 (en) * | 2003-02-06 | 2004-08-19 | Optware Corporation | Optical information recording medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1281175A4 (en) * | 2000-04-07 | 2007-01-17 | Tdk Corp | Optical information medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59210543A (en) * | 1983-05-16 | 1984-11-29 | Nippon Telegr & Teleph Corp <Ntt> | Laser recording medium |
| JPS61203450A (en) * | 1985-03-06 | 1986-09-09 | Matsushita Electric Ind Co Ltd | Optical recording medium |
| JPS62165749A (en) * | 1986-01-17 | 1987-07-22 | Mitsubishi Electric Corp | Optical information recording medium |
-
1987
- 1987-01-30 JP JP62018388A patent/JP2796288B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59210543A (en) * | 1983-05-16 | 1984-11-29 | Nippon Telegr & Teleph Corp <Ntt> | Laser recording medium |
| JPS61203450A (en) * | 1985-03-06 | 1986-09-09 | Matsushita Electric Ind Co Ltd | Optical recording medium |
| JPS62165749A (en) * | 1986-01-17 | 1987-07-22 | Mitsubishi Electric Corp | Optical information recording medium |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0385344A2 (en) * | 1989-02-27 | 1990-09-05 | Matsushita Electric Industrial Co., Ltd. | Optical storage media |
| JPH03157816A (en) * | 1989-11-15 | 1991-07-05 | Matsushita Electric Ind Co Ltd | Optical information recording member and optical information recording and reproducing device |
| JP2002117585A (en) * | 2000-06-09 | 2002-04-19 | Tdk Corp | Optical information medium |
| WO2004070714A1 (en) * | 2003-02-06 | 2004-08-19 | Optware Corporation | Optical information recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2796288B2 (en) | 1998-09-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |