KR930004334B1 - Disk structure of bilaterial disk - Google Patents

Disk structure of bilaterial disk Download PDF

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KR930004334B1
KR930004334B1 KR1019880015937A KR880015937A KR930004334B1 KR 930004334 B1 KR930004334 B1 KR 930004334B1 KR 1019880015937 A KR1019880015937 A KR 1019880015937A KR 880015937 A KR880015937 A KR 880015937A KR 930004334 B1 KR930004334 B1 KR 930004334B1
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double
optical disk
layer
sided
adhesive layer
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KR1019880015937A
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KR900008466A (en
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문병기
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주식회사 금성사
최근선
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    • 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
    • G11B7/24018—Laminated discs
    • G11B7/24027—Layers; Shape, structure or physical properties thereof
    • 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

Abstract

The both-sided opto-magnetic disc structure, which is laminated with adhesive layer (1), protective layers (2,2'), recording layers (3,3') and substrates (4,4'), is characterized in that permalloy layers (5,5') is formed between adhesive layer (1) and protective layers (2,2') to prevent magnetic interference between double-faced recording layers (3,3'). The permalloy layers (5,5') are prepared by adding Mo to Fe-Ni based material. The adhesive layer (1) is prepared from epoxy resin. The use of permalloy layer for opto-magnetic disc secures a long durability of recorded information.

Description

양면 광자기 디스크의 구조Structure of Double-sided Magneto-optical Disk

제1(a)도 내지 제1(c)도는 종래 양면 광자기 디스크의 구성을 보인 구조도.1 (a) to 1 (c) are structural views showing the structure of a conventional double-sided magneto-optical disk.

제2도는 본 발명에 의한 양면 광자기 디스크의 구성을 보인 확대 종단면도.2 is an enlarged longitudinal sectional view showing the configuration of a double-sided magneto-optical disk according to the present invention.

제3(a)도 및 제3(b)도는 본 발명에 의한 광자기 디스크의 작용을 보인 작용도.3 (a) and 3 (b) is a functional diagram showing the action of the magneto-optical disk according to the present invention.

제4도는 본 발명 및 종래의 양면 광자기 디스크의 효과를 S/N-시간의 관계로 비교하여 본 도표.4 is a diagram comparing the effects of the present invention and the conventional double-sided magneto-optical disk in terms of S / N-times.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 접착층 2,2' : 보호층1: adhesive layer 2,2 ': protective layer

3,3' : 기록층 4,4' : 기판3,3 ': recording layer 4,4': substrate

5,5' : 펄머로이(permalloy)층5,5 ': permalloy layer

본 발명은 양면 광자기 디스크의 구조에 관한 것으로, 특히 접착층과 보호층의 사이에 펄머로이(permelloy)층을 형성하여 기록층간의 상호 자기간섭을 방지하는 동시에 접착층을 에폭시 합성수지로 사용하여 제조원가를 절감시키고 생산성을 향상시킬 수 있게 한 양면 광자기 디스크의 구조에 관한 것이다.The present invention relates to a structure of a double-sided magneto-optical disk, and in particular, a permelloy layer is formed between the adhesive layer and the protective layer to prevent mutual magnetic interference between recording layers, and at the same time, the manufacturing cost is reduced by using the adhesive layer as an epoxy synthetic resin. And a structure of a double-sided magneto-optical disk which makes it possible to improve productivity.

종래의 단면 광자기 디스크는 정보기록의 밀도가 낮고, 내구성이 결여되어 근간에는 양면 광자기 디스크의 연구개발이 활발히 이루어지고 있는 바, 현재 개발된 양면 광자기 디스크를 구조상으로 분류하여 첨부된 도면으로 설명하면 다음과 같다.The conventional single-sided magneto-optical disk has a low density of information recording and lacks durability, and research and development of a double-sided magneto-optical disk has been actively carried out in recent years. The explanation is as follows.

제1(a)도에 도시한 바와같은 양면 광자기 디스크구조는 가장 간단한 구조로서, 기판(11)의 상측에 기록층(12), 보호층(13), 접착층(14)이 적층형성되어 있다. 이와같은 양면 광자기 디스크는 제조원가가 저렴한 이점은 있으나, 기능상의 문제가 있으며, 제1(b)도에 도시한 양면 광자기 디스크의 구조는 가장 많이 선택되어 연구되는 구조로서, 기판(11)과 기록층(12)의 사이에 간섭 유전체막(15)을 위치시킴으로써 재생신호의 출력을 강화하는 장점이 있으며, 제1(c)도에 도시한 구조는 기판(11)과 간섭 유전체막(15)의 사이에 Al 반사막(16)을 위치시킨 것으로, 출력을 한층 강화시키는 장점이 있다.The double-sided magneto-optical disk structure as shown in FIG. 1 (a) is the simplest structure, in which a recording layer 12, a protective layer 13, and an adhesive layer 14 are stacked on top of the substrate 11. . Such a double-sided magneto-optical disk has the advantage of low manufacturing cost, but there is a functional problem, the structure of the double-sided magneto-optical disk shown in Figure 1 (b) is the most selected and studied structure, the substrate 11 and By placing the interfering dielectric film 15 between the recording layers 12, the output of the reproduction signal is enhanced. The structure shown in FIG. 1 (c) has the structure of the substrate 11 and the interfering dielectric film 15. By placing the Al reflecting film 16 in between, there is an advantage of further enhancing the output.

또한 광자기 기록재료상으로 양면 광자기 디스크를 분류하면 다음과 같다.In addition, a double-sided magneto-optical disc is classified as follows on magneto-optical recording material.

상기한 광자기 기록재료로서 가장 많이 이용되는 재료는 RE-TM(Rare Earth-Tramsition Metal)비정질 박막으로서 Tb, Fe, Gd, Fe, Dy Fe, Gd Tb Fe, Tb Fe Co등이 연구되고 있으며, 이외에도 재생출력 신호가 강한 Mn Bi, Mn Cu Bi의 3원계 다결정 박막도 연구되고 있다.The most widely used materials as the magneto-optical recording material are RE-TM (Rare Earth-Tramsition Metal) amorphous thin films, such as Tb, Fe, Gd, Fe, Dy Fe, Gd Tb Fe, Tb Fe Co, and the like. In addition, ternary polycrystalline thin films of Mn Bi and Mn Cu Bi, which have strong reproduction output signals, have also been studied.

이상에서 설명한 종래 양면 광디스크의 제1(a)도, 제1(b)도, 제1(c)도와 같은 구조는 모두 기판(11), 보호층(13)등이 형성되어 있으며, 기판(11)의 경우에는 PMMA(Poly MeAng Methacrylate) PC(Poly-Carbonate)등의 재료가 사용되는데, 이는 특히 복굴절에 강하기 때문이며, 실제 디스크의 제조시 크리닝(cleaning)은 하지 않는다.The substrate 11, the protective layer 13, etc. are all formed in the structure similar to the 1st (a), 1st (b), and 1st (c) of the conventional double-sided optical disk demonstrated above, The board | substrate 11 In the case of), a material such as Poly MeAng Methacrylate (PMMA) or Poly-Carbonate (PC) is used, which is particularly strong in birefringence, and does not clean the disk during manufacture.

또한 보호층(13)은 경우는 제1(b)도, 제1(c)도 구조의 간섭유전체막(15)과 동일한 유전체 막으로서, SiO2, Si3N4, AlN등이며, 주로 스퍼터링 또는 이온 플레이팅(plating)법으로 제조한다.In addition, the protective layer 13 is the same dielectric film as the interfering dielectric film 15 of the first (b) and the first (c) structures, and is SiO 2 , Si 3 N 4 , AlN, or the like, and is mainly sputtered. Or prepared by ion plating (plating) method.

또한 양면 접착층(14)을 주로 자외선 열경화성수지를 사용하며, 분무식 접착층(14)을 도포시킨 후, 빛으로 양면을 접착시킨다.In addition, the double-sided adhesive layer 14 mainly uses an ultraviolet thermosetting resin, and after applying the spray-type adhesive layer 14, the both sides are bonded with light.

그러나 상기한 바와같이 지금까지 알려진 종래의 양면 광자기 디스크는 기록층(12)의 자성과 관련된 항자력이 상당히 크므로 실제로 시간이 경과됨에 따라 양면의 기록층(12)이 상호 영향을 미치게되며, 따라서 기록된 정보가 변화되어 결과적으로 출력신호의 S/N가 저하되므로써 광자기 디스크의 성능이 저하되는 문제점이 있었다.However, as described above, the conventional double-sided magneto-optical disc known so far has a great coercive force associated with the magnetism of the recording layer 12, so that the recording layer 12 on both sides has a mutual effect over time, and thus There is a problem that the performance of the magneto-optical disk is degraded because the recorded information is changed and consequently the S / N of the output signal is reduced.

본 발명은 상기한 바와같은 종래의 문제점을 해소하기 위하여 창안한 것으로, 보호층과 접착층의 사이에는 Fe-Ni based 재료에 Mo이 혼합된 펄머로이층이 형성되어 양면 기록층간의 상호 자기간섭이 일어나지 않도록 하며, 접착층 에폭시 합성수지로 함으로써 제조공정을 간소화시킬 수 있게 한 것인바, 본 발명을 설명하기 전에 먼저 본 발명의 요지인 펄머로이의 종류 및 성질에 대하여 설명하면 다음과 같다.The present invention was devised to solve the above-mentioned problems, and a permerloy layer in which Mo is mixed with a Fe-Ni based material is formed between the protective layer and the adhesive layer, so that mutual self-interference between the two-side recording layers occurs. Since it is possible to simplify the manufacturing process by using an adhesive layer epoxy synthetic resin, before explaining the present invention will be described the type and properties of the permerloy, which is the subject of the present invention.

펄머로이는 고투자율(high permeability)을 가진 합금재료로서, M/H값이 매우 크다.Permalloy is an alloy material with high permeability and has a very high M / H value.

즉, 외부 필드(field)(이 필드는 주위 또는 바로 인접하여 접착된 것에 의하여 발생함)의 H에 의해 얻어지는 자화(magnetization) M값이 매우 큰 것으로 쉽게 자화된다는 의미를 나타내며, 펄머로이의 항자력은

Figure kpo00002
Oe 이하로 낮다.That is, it means that the magnetization M value obtained by the H of the outer field (which is caused by being bonded to the surrounding or immediately adjacent) is easily magnetized to a very large value.
Figure kpo00002
Lower than Oe

또한 펄머로이는 주로 Fe-Ni based 재료로서 Mo(Molibeenium)가 4%, Ni : Fe = 79 : 17인 합금을 4-79 펄머로이라 하고, Mo가 5% 첨가시 Ni : Fe : Mo = 79 : 16 : 5인 합금을 슈퍼멀로이(suppermalloy)라 하며, 이 재료의 투자율이 약 1,000,000으로 가장 크다고 알려지고 있다.Permerloy is mainly a Fe-Ni based material, and an alloy with 4% Mo (Molibeenium) and Ni: Fe = 79: 17 is called 4-79 permerol, and when Ni is added 5%, Ni: Fe: Mo = 79 The 16: 5 alloy is called a supermalloy and is known to have the largest permeability of about 1,000,000.

이하 본 발명을 첨부된 도면에 의하여 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

제2도에 도시한 바와 같이 접착층(1)을 중심으로 보호층(2)(2'), 기록층(3)(3'), 기판(4)(4')이 적층형성된 통상의 광자기 디스크 구조에 있어서, 상기 접착층(1)과 보호층(2)(2')의 사이에 펄머로이층(5)(5')이 형성되어 양면 기록층(3)(3')간의 상호 자기 간섭이 일어나지 않도록 하며, 상기 펄머로이층(5)(5')이 Fe-Ni based 재료에 Mo이 첨가된 것으로 하고 상기 접착층(1)이 에폭시 합성수지로 된 것이다.As shown in FIG. 2, a conventional magneto-optical structure in which protective layers 2, 2 ', recording layers 3, 3', and substrates 4, 4 'are laminated on the adhesive layer 1 as a center. In the disc structure, a permerloy layer 5, 5 'is formed between the adhesive layer 1 and the protective layer 2, 2' so that mutual magnetic interference between the double-sided recording layers 3, 3 'is achieved. In this case, the permerloy layers 5 and 5 'are made of Mo-added Fe-Ni based material, and the adhesive layer 1 is made of epoxy synthetic resin.

이와같이 구성된 본 발명에 의한 광자기 디스크는 제3(a)도에 도시한 바와 같이 기록층(3)(3')에 기록된 정보를 가진 필드가 펄머로이층(5)(5')에 트랩(trap)되어 폐회로필드(closed-loop field)(C)를 형성함으로써 기록층(3)(3')간의 상호 자기 간섭이 일어나지 않게 하며, 따라서 시간 경과시 기록 정보를 변화시키지 않고, 결과적으로 출력신호의 S/N를 감소시키지 않는다.In the magneto-optical disk according to the present invention configured as described above, as shown in FIG. 3 (a), a field having information recorded in the recording layer (3) (3 ') is trapped in the permloy layer (5) (5'). It is trapped to form a closed-loop field C so that mutual magnetic interference between recording layers 3 and 3 'does not occur, so that the recording information does not change over time, resulting in output. It does not reduce the S / N of the signal.

제3(b)도는 펄머로이층(5)(5')이 없는 양면 광자기 디스크로서, 이와같은 구조에서는 서로 인터렉션(enteraction)이 발생되어 기록정보를 변화시키게 된다.FIG. 3 (b) shows a double-sided magneto-optical disk without the permaloy layers 5 and 5 '. In such a structure, interaction with each other is generated to change the recording information.

실제로 기록정보를 변화시키는 가장 큰 원인은 기록재료의 불균일성(이러한 불균일성을 박막제조시 불가피하는 것임)에 의하여 기록재료가 가지고 있는 자성이 미시적으로 차이가 나기 때문이다.Indeed, the biggest reason for changing the recording information is that the magnetism of the recording material is microscopically different due to the nonuniformity of the recording material (which is inevitable when manufacturing a thin film).

상기한 바와같은 본 발명에 의한 광자기 디스크의 제조공정을 설명하면 다음과 같다.Referring to the manufacturing process of the magneto-optical disk according to the present invention as described above is as follows.

본 발명의 양면 광자기 디스크는 5.25inch의 PC 단면기판(4)(4')에 TbFeCo의 광자기 기록재료로 Tb 타게트와 FeCo 타게트의 Co-스퍼터링으로 기록층(3)(3')을 2,000Å의 두께로 각각 증착하고, Al2O3타게트를 RF-스퍼터링으로 기록층(3)(3')을 약 1,000Å의 두께로 각각 증착하며, 상기 보호층(2)(2')에 수퍼멀로이를 스퍼터링방법으로 펄멀로이층(5)(5')을 약 2,000Å의 두께로 각각 증착한 다음 1μm 두께의 에폭시 합성수지 접착층(1)으로 단면 광자기 디스크를 접착함으로써 제2도에 도시한 바와같이 양면 광자기 디스크의 제조가 완료된다.The double-sided magneto-optical disk according to the present invention has a TbFeCo magneto-optical recording material on a 5.25 inch PC single-sided board (4) (4 '), and the recording layer (3) (3') is 2,000 by co-sputtering of Tb and FeCo targets. Respectively deposited to a thickness of, Al 2 O 3 targets by RF-sputtering to deposit the recording layers 3 (3 ') to a thickness of about 1,000 Å, respectively, and to the protective layer (2) (2'). Permalloy was deposited by sputtering to form a permalloy layer (5) (5 '), each about 2,000 mm thick, and then bonded to a single-sided magneto-optical disk with an epoxy resin adhesive layer (1 μm thick) as shown in FIG. Likewise, the manufacture of the double-sided magneto-optical disk is completed.

이와같이 제조가 완료된 본 발명의 양면 광자기 디스크(제4도에서는 X로 표시)와 제1(a)도에 도시한 종래의 양면 광자기 디스크(제4도에서는 △로 표시)의 성능을 비교하여 제4도에 도시한 결과를 얻을 수 있었다.The performance of the double-sided magneto-optical disk (indicated by X in FIG. 4) and the conventional double-sided magneto-optical disk (indicated in Δ in FIG. 4) shown in FIG. The result shown in FIG. 4 was obtained.

시험조건은 동일한 항온 항습조건에서 70℃, 95% RH의 환경으로 종래의 경우에는 약 1,500시간 경과후부터 서서히 S/N가 감소함을 알 수 있으며, 본 발명에 의한 광자기 디스크는 S/N가 좀처럼 감소되지 않음을 보여주고 있다.Test conditions are 70 ℃, 95% RH environment under the same constant temperature and humidity conditions in the case of the conventional S / N gradually decreases after about 1,500 hours, the magneto-optical disk according to the present invention S / N is It is rarely seen to be reduced.

이상에서 설명한 바와같은 본 발명에 의한 양면 광자기 디스크는 양쪽면에 위치한 기록층간의 상호 자기 반응이 펄머로이층에 의하여 제지되므로 시간의 경과후에도 기록정보의 변형이 일어나지 않게 되고, 따라서 출력 S/N의 감소를 방지할 수 있으며, 접착제를 저렴한 에폭시 합성수지를 사용함으로써 제조원가가 절감될 뿐만 아니라 종래의 자외선 경화 수지에 비하여 접착과정이 간소화되어 생산성을 향상시키는 등의 효과가 있다.As described above, in the double-sided magneto-optical disk according to the present invention, since the mutual magnetic reaction between the recording layers located on both sides is restrained by the permerloy layer, the deformation of the recording information does not occur even after elapse of time, and thus the output S / N It is possible to prevent the reduction, and by using an epoxy resin inexpensive resin, the manufacturing cost is reduced, and the adhesion process is simplified compared to the conventional UV curable resin, thereby improving productivity.

Claims (3)

접착층(1)을 중심으로 보호층(2)(2'), 기록층(3)(3'), 기판(4)(4')이 적층 형성된 통상의 양면 광자기 디스크 구조에 있어서, 상기 접착층(1)과 보호층(2)(2')의 사이에 펄머로이(permalloy)층 (5)(5')이 형성되어 양면 기록층(3)(3')간의 상호 자기간섭이 일어나지 않도록 한 양면 광자기 디스크 구조.In a conventional double-sided magneto-optical disk structure in which protective layers (2) (2 '), recording layers (3) (3'), and substrates (4) (4 ') are stacked around the adhesive layer (1), the adhesive layer A permalloy layer (5) (5 ') is formed between (1) and the protective layer (2) (2') to prevent mutual magnetic interference between the double-sided recording layers (3) and (3 '). Double-sided magneto-optical disk structure. 제1항에 있어서, 상기 펄머로이층(5)(5')이 Fe-Ni based 재료에 Mo이 첨가된 것을 특징으로 하는 양면 광자기 디스크 구조.The double-sided magneto-optical disk structure according to claim 1, wherein Mo is added to the Fe-Ni based material in the permerloy layer (5) (5 '). 제1항에 있어서, 상기 접착층(1)이 에폭시 합성수지로 된 것을 특징으로 하는 양면 광자기 디스크 구조.The double-sided magneto-optical disk structure according to claim 1, wherein the adhesive layer (1) is made of epoxy synthetic resin.
KR1019880015937A 1988-11-30 1988-11-30 Disk structure of bilaterial disk KR930004334B1 (en)

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