KR900000196B1 - Magnetic record carrier and it's manufacturing method - Google Patents

Magnetic record carrier and it's manufacturing method Download PDF

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KR900000196B1
KR900000196B1 KR1019850008121A KR850008121A KR900000196B1 KR 900000196 B1 KR900000196 B1 KR 900000196B1 KR 1019850008121 A KR1019850008121 A KR 1019850008121A KR 850008121 A KR850008121 A KR 850008121A KR 900000196 B1 KR900000196 B1 KR 900000196B1
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protective layer
layer
magnetic
magnetic layer
magnetic recording
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KR1019850008121A
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Korean (ko)
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KR870004408A (en
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박노열
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주식회사 금성사
허신구
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62Record carriers characterised by the selection of the material
    • G11B5/72Protective coatings, e.g. anti-static or antifriction

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  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

A magnetic layer is coated on PET film in the vacuum tube on the oxygen circumstance of 6x10-5 Torr which forms oxidized layer on the magnetic layer. A first protective layer (13) is coated on the magnetic layer by the highly polymerized compound of 300 angstrom in thickness. A second protective layer is vaperized by ferromagnetic substance on the first protective layer (13) on the oxygen circumstance of 5x10-4 Torr.

Description

자기기록매체와 그 제조방법Magnetic recording medium and its manufacturing method

제1도는 종래 자기기록매체의 구성을 보인 종단면도.1 is a longitudinal sectional view showing the structure of a conventional magnetic recording medium.

제2도는 동상의 사시도.2 is a perspective view of the statue.

제3도는 본 발명의 자기기록매체의 구성을 보인 종단면도.3 is a longitudinal sectional view showing the configuration of the magnetic recording medium of the present invention.

제4도는 자기기록 테이프의 잔류자속밀도 시험의 결과를 보인 그래프로서, 잔류자속밀도의 경시변화를 보인 그래프.4 is a graph showing the results of the residual magnetic flux density test of the magnetic recording tape, showing a change over time of the residual magnetic flux density.

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

11 : 소재필름 12 : 자성층11: material film 12: magnetic layer

13 : 제1보호층 14 : 제2보호층13: first protective layer 14: second protective layer

본 발명은 자기기록매체와 그 제조방법에 관한 것으로 특히, 진공조에서 소재필름의 위에 강자성체를 증착하는 공정중에 순수 산소를 투입하면서 증착하고, 그 강자성층위에 보호층을 도포 형성한 후, 그 보호층위에 강자성체를 순수산소를 투입하면서 증착하여 2중 보호층과 2중 산화막을 형성함으로써 강자성층의 부식을 방지하고 항자력이 높게한 고밀도용 자기기록매체와 그 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium and a method of manufacturing the same, and in particular, in the vacuum bath, pure oxygen is deposited during deposition of a ferromagnetic material on a raw material film, followed by deposition of a protective layer on the ferromagnetic layer. The present invention relates to a high-density magnetic recording medium having a high magnetic resistance to prevent corrosion of a ferromagnetic layer by forming a double protective layer and a double oxide film by depositing a ferromagnetic material on a layer while injecting pure oxygen.

자기기록매체에 있어서, PET(폴리에칠렌 텔레프탈레이트)필름등의 소재필름위에 Fe,Co,Ni등의 금속이나 그들의 합금을 증착하여 강자성 금속박막층을 형성한 자기기록매체는 고밀도 기록용으로 적합한 특성을 가지고 있다. 그러나 이러한 자기기록매체는 제조시에 자성층의 균일한 증착과 전자변환특성의 향상을 위하여 표면조도가 극히 적은 소재필름을 사용하게 되는바, 소재필름의 조도는 강자성 금속박막층의 조도에 직접으로 영향을 미치게 되므로, 자기테이프가 가이드로울러 및 자기드럼에 접촉주행할 때 쉽게 밀착되어 변형되고 그에 따라 주행이 불안정해지는 문제점이 있었다.In the magnetic recording medium, a magnetic recording medium having a ferromagnetic metal thin film layer formed by depositing a metal such as Fe, Co, Ni or alloys thereof on a material film such as PET (polyethylene telephthalate) film has a property suitable for high density recording. have. However, such a magnetic recording medium uses a material film having a very low surface roughness in order to uniformly deposit a magnetic layer and improve electron conversion characteristics. Thus, the roughness of the material film directly affects the roughness of the ferromagnetic metal thin film layer. Since it is crazy, the magnetic tape is in close contact with the guide roller and the magnetic drum, and easily deformed, thereby deteriorating driving.

따라서 이러한 증착 자기 테이프에 따른 문제점을 해소하기 위하여 제1도 및 제2도에 도시한 바와 같이 소재필름(1)위에 증착된 자성층(2)위에 고분자화합물을 도포하여 보호층(3)을 형성함으로서 테이프의 표면조도를 조금 크게하여 주행을 인정하게 하는 기술이 알려지고 있다.Therefore, in order to solve the problem caused by the deposited magnetic tape, as shown in FIGS. 1 and 2, by applying a polymer compound on the magnetic layer 2 deposited on the material film 1, the protective layer 3 is formed. There is a known technique for allowing the surface roughness of the tape to be slightly increased to allow driving.

그런, 이와 같이 자성층(2)위에 도포형성된 보호층(3)은 그 형상이 섬형상(Island type)으로 형성되어지므로 자성층(2)의 많은 부분이 공기중에 노출되고 그 노출된 부분의 강자성금속이 산화되어 테이프의 자기특성을 저하시키는 결함이 있엇다.As such, the protective layer 3 coated and formed on the magnetic layer 2 is formed in an island shape, so that a large portion of the magnetic layer 2 is exposed to air and the ferromagnetic metal of the exposed portion is exposed. There is a defect that is oxidized and degrades the magnetic properties of the tape.

본 발명은 이와 같은 종래 기술의 결함을 해소하기 위하여 창안한 것으로, 자성층의 증착시에 진공조내부에 고순도의 산소가스를 주입하여 자성층의 표면에 산화막을 형성한 후 그 산화막위에 제1보호층을 도포형성하고 그 보호층위에 강자성 금속을 산소가스가 개재된 상태에서 증착하여 2차보호층을 형성함으로써, 자기기록테이프의 내식성을 향상하고 항자력을 증가하여 고밀도 기록에 적합한 자기기록테이프와 그 제조방법을 제공하기 위한 것인 바, 이와 같은 본 발명의 일실시예를 첨부한 제3도 및 제4도에 의하여 상세히 설명하면 다음과 같다.The present invention was devised to solve such a deficiency of the prior art, and when the magnetic layer is deposited, high purity oxygen gas is injected into the vacuum chamber to form an oxide film on the surface of the magnetic layer, and then a first protective layer is formed on the oxide film. By forming a secondary protective layer by coating and depositing a ferromagnetic metal on the protective layer in the presence of oxygen gas, the magnetic recording tape suitable for high-density recording is improved by improving the corrosion resistance of the magnetic recording tape and increasing the coercive force. To provide a bar, described in detail with reference to Figure 3 and 4 attached to an embodiment of the present invention as follows.

일정진공도가 유지되는 진공조내부에서 두께 12mm의 PET 필름인 소재필름(11)위에 Fe, Co, Ni 등의 강자성금속을 증착하는 공정중에 진공조내부에 6×10-5Torr 정도의 산소가스를 포함시켜 소재필름(11)위에 두께 1500Å정도로 형성되는 자성층(12)의 표면에 산화막이 형성되게 하고 그 자성층(12)위에 고분자화합물을 도포하여 300Å 이하의 두께를 가지는 제1보호층 (13)을 형성한 후, 그 제1보호층(13)위에 Fe, Co, Ni 등의 강자성 금속이나 그들의 합금을 5×10-4Torr 정도의 산소가스를 포함시켜 표면에 산화막이 구비된 제2보호층(14)을 두께 200Å정도로 증착형성한 것이다.During the process of depositing ferromagnetic metals such as Fe, Co, and Ni on the material film 11, which is a PET film having a thickness of 12 mm, in a vacuum chamber in which a constant vacuum degree is maintained, oxygen gas of about 6 × 10 -5 Torr is introduced into the vacuum chamber. To form an oxide film on the surface of the magnetic layer 12 formed on the material film 11 with a thickness of about 1500 GPa, and apply a polymer compound on the magnetic layer 12 to form a first protective layer 13 having a thickness of 300 GPa or less. After the formation, the second protective layer having an oxide film on the surface of the first protective layer 13 by containing ferromagnetic metals such as Fe, Co, and Ni or an alloy thereof with oxygen gas of about 5 × 10 −4 Torr ( 14) is deposited to a thickness of about 200Å.

이와 같이 된 본 발명 자기기록매체는 자성층(12)위에 산화막이 형성되어있으므로 자성층(12)의 산화현상이 일차적으로 방지되고, 그 자성층(12)위에 제1보호층(13)이 형성되어 테이프의 표면조도가 증가됨으로써 주행성이 개선되며, 그 제1보호층(13)위에 산화막을 표면에 구비한 제2보호층(14)이 형성되어 있으므로 제1보호층(13)을 외부공기로부터 완전히 차단하게 되어 자성층(12)의 산화를 완벽하게 방지하게 될 뿐아니라 테이프의 변형이 방지되고 항자력이 증가하여 고밀도 자기기록테이프로서 우수한 특성을 갖게된다.In the magnetic recording medium of the present invention as described above, since an oxide film is formed on the magnetic layer 12, oxidation of the magnetic layer 12 is primarily prevented, and a first protective layer 13 is formed on the magnetic layer 12 to form a tape. As surface roughness is increased, driving performance is improved, and a second protective layer 14 having an oxide film on the surface is formed on the first protective layer 13 so that the first protective layer 13 is completely blocked from external air. Therefore, not only the oxidation of the magnetic layer 12 is completely prevented, but also the deformation of the tape is prevented and the coercive force is increased to have excellent characteristics as a high density magnetic recording tape.

이와 같은 본 발명의 일실시예에 따른 자기기록매체의 성능측정을 위하여 본 발명의 자기기록테이프, 즉 자성층위 보호층을 이중으로 형성한 테이프와 자성층위에 하나의 보호층만을 형성한 종래기술의 테이프를 온도 65℃ 상대습도 90% 상태에서 방치하여 잔류자속밀도의 량을 측정하였으며, 이러한 측정의 결과를 제4도에 도시하였다.In order to measure the performance of the magnetic recording medium according to the embodiment of the present invention, the magnetic recording tape of the present invention, that is, a tape in which the protective layer on the magnetic layer is formed in duplicate, and a tape of the prior art in which only one protective layer is formed on the magnetic layer Was left at a temperature of 65 ° C. and a relative humidity of 90% to measure the amount of residual magnetic flux density, and the results of these measurements are shown in FIG.

제4도중 종축에는 초기 잔류자속밀도(Mr)에 대한 시간의 경과에 따른 잔류자속밀도의 감소량(ΔMr)의 백분율이 표시되고 횡축에는 경과일수가 표시되어 있으며, 도면중 a는 본 발명 자기기록테이프에 따른 특성곡선을 보인 것이고 b는 종래기술의 자기기록테이프에 따른 특성곡선을 보인 것으로 특성곡선을 VSM 계측기(Vibrating Sample Magnetometer)로 측정한 값에 따른 것이다.In Fig. 4, the vertical axis shows the percentage of the decrease in residual magnetic flux density (ΔMr) with respect to the initial residual magnetic flux density (Mr) over time, and the horizontal axis shows the elapsed days. B is a characteristic curve according to the magnetic recording tape of the prior art, and the characteristic curve is measured by a VSM measuring instrument (Vibrating Sample Magnetometer).

제4도에 도시한 바와 같이 고온다습한 혹심한 분이기에서 방치한 2주일째 되는 때에 종래기술의 자기기록테이프는 잔류자속밀도어의 감소율이 9%인 반면에 본 발명 자기기록테이프는 4%의 감소율을 보이고 있다. 따라서 본 발명 자기기록테이프의 자기기록 특성이 우수함을 알 수 있다.As shown in FIG. 4, the magnetic recording tape of the prior art has a 9% reduction in residual magnetic flux density while the magnetic recording tape of the prior art has a reduction rate of 9% when left at a high temperature and humidity. The decrease rate is showing. Accordingly, it can be seen that the magnetic recording characteristics of the magnetic recording tape of the present invention are excellent.

Claims (2)

소재필름(11)위에 자성층(12)를 증착하고 그 자성층(12)우에 그보다 큰 표면조도를 갖도록 고분자화합물의 제1보호층(13)을 도포형성하여 주행안정성을 향상한 통상의 자기기록매체에 있어서, 상기 제1보호층(13)위에 산소가스를 포함한 Fe, Co, Ni 등의 강자성 금속을 증착하여 표면에 산화막을 구비한 제2보호층(14)을 형성하여, 상기 제1보호층(13)이 피복되고 그 제1보호층(13)의 균열부분으로 자성층(12)이 외부공기에 노출됨을 방지하도록 구성한 것을 특징으로 하는 자기기록매체.The magnetic layer 12 is deposited on the material film 11, and the first protective layer 13 of the polymer compound is coated on the magnetic layer 12 so as to have a larger surface roughness. In the first protective layer 13, a ferromagnetic metal such as Fe, Co, and Ni containing oxygen gas is deposited to form a second protective layer 14 having an oxide film on a surface thereof, thereby forming the first protective layer ( 13) is coated and is formed so as to prevent the magnetic layer (12) from being exposed to external air by the crack portion of the first protective layer (13). 진공조내부에 소재필름위에 자성층을 증착하고, 그 자성층위에 보호층을 도포형성하는 제조방법에 있어서, 자성층을 증착형성하는 중에 진공조내부에 6×10-5Torr정도의 산소가스를 포함시켜 표면에 산화막을 구비한 자성층을 형성하고, 그 위에 고분자 화합물등을 도포하여 약 300Å이하의 제1보호층(13)을 형성하며, 그 제1보호층(13)위에 5×10-4Torr 정도의 산소가스를 포함한 Fe, Co, Ni 등의 강자성 금속을 증착함으로써 표면에 산화막을 구비한 제2보호층(14)를 형성하는 것을 특징으로 하는 자기기록매체의 제조방법.A manufacturing method of depositing a magnetic layer on a material film in a vacuum chamber and applying a protective layer on the magnetic layer, wherein the oxygen layer of about 6 × 10 -5 Torr is included in the vacuum chamber while the magnetic layer is deposited. A magnetic layer having an oxide film was formed thereon, and a high molecular compound or the like was applied thereon to form a first protective layer 13 of about 300 GPa or less, and 5 × 10 -4 Torr on the first protective layer 13. A method of manufacturing a magnetic recording medium, characterized in that a second protective layer (14) having an oxide film is formed on a surface by depositing ferromagnetic metals such as Fe, Co, and Ni containing oxygen gas.
KR1019850008121A 1985-10-31 1985-10-31 Magnetic record carrier and it's manufacturing method KR900000196B1 (en)

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KR900000196B1 true KR900000196B1 (en) 1990-01-23

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