JPS6182349A - Information recording medium - Google Patents
Information recording mediumInfo
- Publication number
- JPS6182349A JPS6182349A JP20362584A JP20362584A JPS6182349A JP S6182349 A JPS6182349 A JP S6182349A JP 20362584 A JP20362584 A JP 20362584A JP 20362584 A JP20362584 A JP 20362584A JP S6182349 A JPS6182349 A JP S6182349A
- Authority
- JP
- Japan
- Prior art keywords
- information recording
- information
- recording medium
- film
- magnetizing
- 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
- G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
- G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
- G11B13/045—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties combined recording by magnetic and optic means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、磁気光学効果を用いて情報の記録・読取りを
行う情報記録媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an information recording medium that records and reads information using magneto-optical effects.
従来、このような情報記録媒体の基盤に形成される垂直
磁化膜の磁化方向は一般にランダムであり、情報を記録
する前に記録光スポットが照射される部分のみを一方向
に磁化して前の記録を消去し、その後に情報を記録して
いた。Conventionally, the magnetization direction of the perpendicularly magnetized film formed on the base of such information recording media is generally random, and before recording information, only the part irradiated with the recording light spot is magnetized in one direction, and the previous Records were erased and information was recorded afterwards.
すなわち、第２図のような情報記録円盤を例にとると、
基盤１上に垂直磁化膜２が形成され、その垂直磁化膜２
の一部分Ｍの拡大図を示すと、従来は第３図または第４
図のようになっていた。In other words, if we take an information recording disk as shown in Figure 2 as an example,
A perpendicular magnetization film 2 is formed on a substrate 1, and the perpendicular magnetization film 2
An enlarged view of part M of
It looked like the picture.
第３図において、垂直磁化１！ｉｉ２はその磁化方向が
ランダムの状態になっており（図中、５で示す）ここで
磁界を印加して記録光スポットを照射することにより、
磁化方向下（上）向きの記録情報３を記録する。In Figure 3, perpendicular magnetization 1! ii2 has a random magnetization direction (indicated by 5 in the figure), and by applying a magnetic field and irradiating the recording light spot,
Record information 3 with a downward (upward) magnetization direction is recorded.
また、第４図においては、情報を記録する部分を磁化方
向上（下）向き４にして消去した後、記録情報３を記録
する。Further, in FIG. 4, after erasing the portion where information is to be recorded with the magnetization direction upward (downward) 4, recorded information 3 is recorded.
この後、いずれの場合も読取り光スポットを照射して、
情報を読み取るようにしていた。After this, in either case, irradiate the reading light spot,
I was trying to read the information.
しかしながら、このような従来の情報記録媒体では、次
のような欠点があった。However, such conventional information recording media have the following drawbacks.
■ 第３図のような従来例では、記録情報３の間の磁化
方向ランダムの部分５を読取り光スポットが通過すると
きに、ランダムノイズが増加し、また信号レベルも低い
。(2) In the conventional example shown in FIG. 3, when the reading light spot passes through the random magnetization direction portion 5 between the recorded information 3, random noise increases and the signal level is also low.
■ 第４図のような従来例では、上記欠点■は改善され
ているが、消去部分４と記録情報３が一致しなかったり
、記録情報３から読取り光スポットがずれたりすると、
磁化方向ランダムの部分５がノイズとして信号に混入す
ることになる。■ In the conventional example shown in FIG. 4, the above-mentioned drawback (■) has been improved, but if the erased portion 4 and the recorded information 3 do not match or the reading light spot deviates from the recorded information 3,
The random magnetization direction portion 5 will be mixed into the signal as noise.
また、読取り光スポツト径が大きい場合にも同様である
。The same applies when the reading light spot diameter is large.
本発明の目的は、上記従来の情報記録媒体の欠点を克服
し、読取り光スポットが記録情報部分から多少ずれたり
、径が大きくなったりした場合でも、ノイズを低減する
ことのできる、改良された情報記録媒体を提供すること
にある。An object of the present invention is to overcome the drawbacks of the conventional information recording medium described above, and to provide an improved method capable of reducing noise even when the reading light spot is slightly deviated from the recorded information portion or the diameter thereof is increased. The objective is to provide information recording media.
以下、図によって本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to the drawings.
第１図は、本発明の一実施例よりなる情報記録媒体の要
部拡大図である。FIG. 1 is an enlarged view of essential parts of an information recording medium according to an embodiment of the present invention.
すなわち、第２図のような情報記録円盤を例にとると、
基盤１の上に垂直磁化膜２が形成されており、その一部
分Ｍの拡大図が第１図に相当する。In other words, if we take an information recording disk as shown in Figure 2 as an example,
A perpendicularly magnetized film 2 is formed on a substrate 1, and an enlarged view of a portion M thereof corresponds to FIG.
本発明においては、垂直磁化膜２を基盤１上に形成した
後、垂直磁化膜２の磁化方向を上向きまたは下向きの一
方向に統一シ（３）、情報記録時に前記磁化方向と逆方
向の磁界（４）を印加しながら消去して、記録光スポッ
トを照射する点が特徴である。In the present invention, after forming the perpendicularly magnetized film 2 on the substrate 1, the magnetization direction of the perpendicularly magnetized film 2 is unified to either upward or downward (3), and a magnetic field in the opposite direction to the magnetization direction is applied during information recording. The feature is that the recording light spot is irradiated by erasing while applying (4).
なお、上記実施例では円盤状の媒体について説明したが
、テープ状のものであってもよい。In the above embodiments, a disc-shaped medium is described, but a tape-shaped medium may be used.
以上説明したように、本発明は上記構成をとるため、読
取り光スポット６が少しずれたり、径が大きくなったり
した場合でも、磁化方向逆向きの消去部分４が読み取ら
れるため、信号レベルは若干小さくなるが、ノイズは増
大しない。As explained above, since the present invention has the above configuration, even if the reading light spot 6 is slightly shifted or the diameter becomes large, the erased portion 4 with the opposite magnetization direction is read, so the signal level will be slightly lower. It gets smaller, but the noise doesn't increase.
特に、温度補償の場合には、磁化するための温度が低く
、一方向の磁化はより容易にできる。In particular, in the case of temperature compensation, the temperature for magnetization is low, and magnetization in one direction can be more easily achieved.
また、基盤がガラスの場合には、キュリ一点まで温度を
上げて磁化方向を揃えることが可能である。Furthermore, if the substrate is made of glass, it is possible to align the magnetization direction by increasing the temperature to a single curri point.
第１図は本発明の一実施例よりなる情報記録媒体の要部
拡大図、第２図は情報記録媒体の平面図、および第３図
、第４図はそれぞれ従来例よりなる情報記録媒体の要部
拡大図である。
１・・・基盤、２・・・垂直磁化膜、３・・・一方向磁
化部分（記録情報）、４・・・逆方向磁化部分（消去部
分）、５・・・ランダム磁化部分、６・・・読取り光ス
ポット。FIG. 1 is an enlarged view of main parts of an information recording medium according to an embodiment of the present invention, FIG. 2 is a plan view of the information recording medium, and FIGS. 3 and 4 are respectively of conventional information recording media. It is an enlarged view of the main part. DESCRIPTION OF SYMBOLS 1... Base, 2... Perpendicular magnetization film, 3... Unidirectional magnetization part (recorded information), 4... Reverse direction magnetization part (erasing part), 5... Random magnetization part, 6. ...Reading light spot.
Claims (1)
媒体において、該情報記録媒体の基盤に形成された垂直
磁化膜の磁化方向を上向きまたは下向きの一方向に統一
し、情報記録時に前記磁化方向と逆方向の磁界を印加し
ながら記録光スポットを照射して記録するように構成さ
れたことを特徴とする情報記録媒体。In an information recording medium that records and reads information using the magneto-optical effect, the magnetization direction of the perpendicularly magnetized film formed on the base of the information recording medium is unified to one direction, either upward or downward, and when information is recorded, the magnetization direction is An information recording medium characterized in that it is configured to perform recording by irradiating a recording light spot while applying a magnetic field in a direction opposite to that of the information recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20362584A JPS6182349A (en) | 1984-09-28 | 1984-09-28 | Information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20362584A JPS6182349A (en) | 1984-09-28 | 1984-09-28 | Information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6182349A true JPS6182349A (en) | 1986-04-25 |
Family
ID=16477139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20362584A Pending JPS6182349A (en) | 1984-09-28 | 1984-09-28 | Information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6182349A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59142760A (en) * | 1983-02-02 | 1984-08-16 | Canon Inc | Optical information recording device |
-
1984
- 1984-09-28 JP JP20362584A patent/JPS6182349A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59142760A (en) * | 1983-02-02 | 1984-08-16 | Canon Inc | Optical information recording device |
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