KR20060113905A - Phase-change optical disk - Google Patents

Phase-change optical disk Download PDF

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Publication number
KR20060113905A
KR20060113905A KR1020067008197A KR20067008197A KR20060113905A KR 20060113905 A KR20060113905 A KR 20060113905A KR 1020067008197 A KR1020067008197 A KR 1020067008197A KR 20067008197 A KR20067008197 A KR 20067008197A KR 20060113905 A KR20060113905 A KR 20060113905A
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South Korea
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substrate
layer
phase change
protective layer
thermal conductivity
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KR1020067008197A
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Korean (ko)
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모리오 나까따니
신지 고바야시
요시히사 스즈끼
아쯔시 야마구찌
마사히로 히구찌
요시아끼 마에노
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산요덴키가부시키가이샤
산요 마빅·메디아 가부시끼가이샤
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Publication of KR20060113905A publication Critical patent/KR20060113905A/en

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Abstract

A phase-change optical disk which has recording/reproducing reliability and durability even when a biodegradable resin is used. The phase-change comprises a biodegradable resin substrate (1) with a lower dielectric protective film (2), a phase- change recording layer (3), an upper dialectic protective film (4), metal reflective film (5), and a protective film (6) formed over the biodegradable resin substrate (1). The lower dielectric protective layer (2) is made of a material of low heat conductivity. The upper dielectric protective film (4) is made of a material of higher heat conductivity than that of the lower dielectric protective layer (2).

Description

상변화형 광디스크{PHASE-CHANGE OPTICAL DISK}Phase change type optical disc {PHASE-CHANGE OPTICAL DISK}

본 발명은 비정질상과 결정상의 가역적 상변화를 이용한 상변화형 광디스크에 관한 것으로, 특히 환경 부하가 적은 상변화형 광디스크에 관한 것이다. The present invention relates to a phase change type optical disc using reversible phase change of an amorphous phase and a crystal phase, and more particularly, to a phase change type optical disc with less environmental load.

상변화형 광디스크는 재기입 가능한 광디스크로서, 예를 들어 CD-RW(Compact Disc-rewitable)나 CD-RW보다 대용량인 DVD-RW(Digital Versatile Disc-rewitable) 등이 실용화되어 있다. A phase change type optical disc is a rewritable optical disc. For example, a compact disc-rewitable (CD-RW), a digital versatile disc-rewitable (DVD-RW) having a larger capacity than the CD-RW, and the like have been put to practical use.

도8은 종래의 상변화형 광디스크(100)의 구조를 나타내는 개략 단면도이다. 도면에 도시한 바와 같이, 상변화형 광디스크는 기판(101) 상에 하측 유전체 보호막(102), 기록층(103), 상측 유전체 보호막(104), 금속 반사막(105), 보호막(106)이 적층 형성되어 있다. 8 is a schematic cross-sectional view showing the structure of a conventional phase change type optical disk 100. As shown in the figure, a phase change type optical disk is formed by stacking a lower dielectric protective film 102, a recording layer 103, an upper dielectric protective film 104, a metal reflective film 105, and a protective film 106 on a substrate 101. Formed.

CD-RW로서의 상변화형 광디스크에 있어서는, 기판(101)은 두께 1.2 ㎜의 폴리카보네이트제 투명 기판으로 구성되고, 하측 및 상부 유전체 보호막(102, 104)에는 ZnS와 SiO2의 혼합물로 이루어지는 유전체가, 기록층(103)에는 AgInSbTe 또는 GeSbTe 상변화층이, 반사막(105)에는 Al 합금, 보호층은 UV 경화 수지가 일반적으로 이용되고 있다. 그리고, 각 층은, 하측 유전체 보호막(102)은 40 ㎚ 내지 80 ㎚, 상측 유전체 보호막(104)은 10 ㎚ 내지 40 ㎚, 기록층(103)은 10 ㎚ 내지 40 ㎚, 반사막(105)은 20 ㎚ 내지 40 ㎚ 정도의 두께로 각각 설치되어 있다. In a phase change type optical disk as a CD-RW, the substrate 101 is composed of a 1.2 mm thick polycarbonate transparent substrate, and the lower and upper dielectric protective films 102 and 104 have a dielectric composed of a mixture of ZnS and SiO 2 . The AgInSbTe or GeSbTe phase change layer is used for the recording layer 103, Al alloy is used for the reflecting film 105, and UV curable resin is generally used for the protective layer. In each layer, the lower dielectric protective film 102 is 40 nm to 80 nm, the upper dielectric protective film 104 is 10 nm to 40 nm, the recording layer 103 is 10 nm to 40 nm, and the reflective film 105 is 20 nm. It is provided in thickness of about nm-40 nm, respectively.

폴리카보네이트제의 기판(101)에는 트래킹용 그루브(107)가 사출 성형법에 의해 형성되고, 그루브(107) 사이에 랜드(108)가 형성된다. A tracking groove 107 is formed on the polycarbonate substrate 101 by an injection molding method, and lands 108 are formed between the grooves 107.

상기한 바와 같이, 상변화형 광디스크의 종래의 구조에 있어서는 기록층(103)이 유전체 보호막(102, 104)으로 샌드위치가 된 구조로 되어 있고, 또한 이용되고 있는 SiO2의 실온에서의 열전도율은 6.8 W/mㆍK(Watts/meterㆍkelvin)로 매우 낮다. As described above, in the conventional structure of the phase change type optical disk, the recording layer 103 is sandwiched by the dielectric protective films 102 and 104, and the thermal conductivity at room temperature of SiO 2 used is 6.8. W / m · K (Watts / meter · kelvin) is very low.

상변화형 광디스크에 있어서, 일반적으로 이용되어 온 SiO2-ZnS 유전체의 열전도율은 7 W/mㆍK 내지 13 W/mㆍK 정도이다. 이로 인해, 기록층(103)에서 발생한 열은 기록층(103)으로 축열되고 그 후, 서서히 유전체층(102, 104)으로 전달되어 기판(101)과 반사층(105)의 양쪽 층에 방열된다. In a phase change type optical disk, the thermal conductivity of SiO 2 -ZnS dielectrics generally used is about 7 W / m · K to 13 W / m · K. As a result, heat generated in the recording layer 103 is accumulated in the recording layer 103, and then gradually transferred to the dielectric layers 102 and 104 to radiate heat to both the substrate 101 and the reflective layer 105.

한편, 상기한 DVD-RW인 광디스크는, 0.6 m의 두께인 2매의 기판을 접합한 구조로 되어 있고, 기록 용량의 증대를 목적으로 단일판 타입의 디스크 2매를 접합하여 양면에 정보 기록층을 설치한 접합 구조 타입이나, 폴리카보네이트 수지 등의 투명 기판에 정보 기록층을 성막한 기판과 더미 기판을 접합한 타입 등이 있다. 그러나, 최근 기록 매체의 고밀도화 요구가 점점 강해져 투명 기판을 접합하는 경우를 포함하고, 광디스크는 접합 구조 타입이 많이 이용되고 있다.On the other hand, the above-described optical disc of DVD-RW has a structure in which two substrates of 0.6 m in thickness are bonded to each other, and for the purpose of increasing the recording capacity, two single-plate type disks are bonded to each other to form an information recording layer. And a type in which a substrate in which an information recording layer is formed and a dummy substrate are bonded to a transparent substrate such as a polycarbonate resin or a transparent substrate. However, in recent years, there has been an increasing demand for higher density of recording media, including the case of bonding transparent substrates, and optical discs are often used in a bonded structure type.

광디스크의 접합으로는 핫멜트형 접착제나 자외선 경화형 접착제 등이 사용 되고 있고, 그들 접착제의 도포 방법에는 스핀 코트법이나 롤 코트법, 스크린 인쇄법 등이 채용되고 있다. Hot-melt adhesives, ultraviolet curable adhesives, etc. are used for joining an optical disk, and the spin coat method, the roll coat method, the screen printing method, etc. are employ | adopted as the method of apply | coating these adhesives.

그런데, 상기한 광디스크에 있어서는, 불필요해졌을 때에는 기판으로서 폴리카보네이트 수지를 이용하고 있기 때문에 소각 내지 매립 등에 의해 폐기해야만 하여 폐기물 처리에 대한 문제가 있다. 환경 문제로부터 어떠한 대책을 취하는 것이 바람직하다. By the way, in the above optical disk, when it is no longer needed, since the polycarbonate resin is used as the substrate, it has to be disposed of by incineration or embedding, etc., which causes a problem of waste treatment. It is desirable to take some countermeasures from environmental issues.

이러한 문제점에 비추어, 광디스크의 기판에 자연계에 있어서 분해 가능한 기재인 생분해 수지를 이용한 광디스크가 제안되어 있다(예를 들어, 특허 문헌 1 참조). In view of such a problem, an optical disk using a biodegradable resin which is a substrate degradable in nature has been proposed for a substrate of an optical disk (see Patent Document 1, for example).

[특허 문헌 1] 일본 특허 공개 제2000-11448호 공보 [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2000-11448

그러나, 생분해성 수지를 이용한 디스크에 있어서는 생분해성 수지의 유리 전이 온도가 60 ℃로 매우 낮다. 이로 인해, 상기한 기판에 열이 전달되는 구조의 광디스크에 있어서는 기판 변형을 일으켜 기록 재생에 문제가 생기거나, 내구성이 현저하게 저하되는 등의 문제가 있다. However, in the disc using biodegradable resin, the glass transition temperature of biodegradable resin is very low as 60 degreeC. For this reason, in an optical disk having a structure in which heat is transferred to the substrate, there is a problem such as a deformation of the substrate, a problem in recording and reproducing, or a decrease in durability.

그래서, 본 발명에 있어서는 생분해성 수지를 이용해도 확실한 기록 재생 및 내구성을 얻을 수 있는 상변화형 광디스크를 제공하는 것을 과제로 한다.Accordingly, an object of the present invention is to provide a phase change type optical disk that can achieve reliable recording and reproducing and durability even when using a biodegradable resin.

본 발명의 상변화형 광디스크는 생분해성 수지로 이루어지는 기판과, 이 기판 상에 설치된 제1 보호층과, 이 제1 보호층 상에 설치된 상변화형 기록층과, 이 기록층 상에 설치된 제2 보호층을 구비하는 상변화형 광디스크에 있어서, 기판측의 상기 제1 보호층은 열전도율이 낮은 재료로 형성되고, 상기 제2 보호층은 제1 보호층보다 열전도율이 높은 재료로 형성되어 있는 것을 특징으로 한다. The phase change type optical disc of the present invention includes a substrate made of biodegradable resin, a first protective layer provided on the substrate, a phase change type recording layer provided on the first protective layer, and a second provided on the recording layer. In a phase change type optical disc having a protective layer, the first protective layer on the substrate side is formed of a material having a lower thermal conductivity, and the second protective layer is formed of a material having a higher thermal conductivity than the first protective layer. It is done.

상기 제2 보호층은 그 열전도율이 100 W/mㆍK 이상인 것을 이용하면 좋다. What is necessary is just to use the said 2nd protective layer whose thermal conductivity is 100 W / m * K or more.

상기 제2 보호층은 열전도율이 높게 고반사율의 금속 반사층으로 구성할 수 있다. The second protective layer may be formed of a metal reflective layer having a high reflectance with high thermal conductivity.

또한, 본 발명의 상변화형 광디스크는, 적어도 한쪽에 기록층을 갖는 2매의 생분해성 수지로 이루어지는 기판을 접합한 상변화형 광디스크에 있어서, 적어도 한쪽의 기판에는 제1 보호층과, 이 제1 보호층 상에 설치된 상변화형 기록층과, 이 기록층 상에 설치된 제2 보호층을 구비하고, 상기 기판측의 상기 제1 보호층은 열전도율이 낮은 재료로 형성되고, 상기 제2 보호층은 제1 보호층보다 열전도율이 높은 재료로 형성되어 있는 것을 특징으로 한다. The phase change type optical disc of the present invention is a phase change type optical disc in which at least one substrate is formed of two biodegradable resins having a recording layer, wherein at least one substrate has a first protective layer and a first protective layer. A phase change type recording layer provided on the first protective layer, and a second protective layer provided on the recording layer, wherein the first protective layer on the substrate side is formed of a material having low thermal conductivity, and the second protective layer Is formed of a material having a higher thermal conductivity than the first protective layer.

상기 제2 보호층은 그 열전도율이 100 W/mㆍK 이상인 것을 이용하면 좋다. What is necessary is just to use the said 2nd protective layer whose thermal conductivity is 100 W / m * K or more.

상기 제2 보호층은 열전도율이 높고 고반사율의 금속 반사층으로 구성할 수 있다. The second protective layer may be formed of a metal reflective layer having high thermal conductivity and high reflectance.

상기 기재를 생분해성 접착제를 주성분으로 하는 접착층에 의해 접합하면 좋고, 또한 상기 접착층에 분해 박테리아를 함유시키면 좋다. The base material may be joined by an adhesive layer containing a biodegradable adhesive as a main component, and the decomposing bacteria may be contained in the adhesive layer.

본 발명은 기록시 등의 레이저광에 의한 온도 상승을 기판에 전달하기 어렵고, 생분해성 수지로 이루어지는 기판을 이용해도 반복 기록에 의한 기판의 변형 등을 방지할 수 있다. In the present invention, it is difficult to transmit the temperature rise by the laser light at the time of recording to the substrate, and deformation of the substrate due to repetitive recording can be prevented even when a substrate made of biodegradable resin is used.

도1은 본 발명의 제1 실시 형태에 관한 상변화형 광디스크의 구조를 도시하는 개략 단면도이다. 1 is a schematic sectional view showing the structure of a phase change type optical disc according to a first embodiment of the present invention.

도2는 본 발명의 제2 실시 형태에 관한 상변화형 광디스크의 구조를 도시하는 개략 단면도이다. 2 is a schematic sectional view showing the structure of a phase change type optical disc according to a second embodiment of the present invention.

도3은 시뮬레이션시에 있어서의 유전체의 열전도율이 10 W/mㆍK에 있어서의 30 ℃마다 온도 분포 상태를 나타내는 모식도이다. Fig. 3 is a schematic diagram showing a temperature distribution state at 30 ° C. at a dielectric constant of 10 W / m · K at the time of simulation.

도4는 기록층의 후방측 유전체층의 열전도율과 온도의 관계를 나타내는 특성도이다. Fig. 4 is a characteristic diagram showing the relationship between the thermal conductivity and the temperature of the dielectric layer on the back side of the recording layer.

도5는 본 발명의 제3 실시 형태에 관한 광디스크를 도시하는 모식적 단면도이다. 5 is a schematic sectional view showing an optical disc according to a third embodiment of the present invention.

도6은 본 발명의 제4 실시 형태에 관한 광디스크를 도시하는 모식적 단면도이다. 6 is a schematic cross-sectional view showing an optical disc according to a fourth embodiment of the present invention.

도7은 본 발명의 제5 실시 형태에 관한 광디스크를 도시하는 모식적 단면도이다. 7 is a schematic sectional view showing an optical disc according to a fifth embodiment of the present invention.

도8은 종래의 상변화형 광디스크의 구조를 도시하는 개략 단면도이다. 8 is a schematic sectional view showing the structure of a conventional phase change type optical disk.

(부호의 설명)(Explanation of the sign)

1 : 기판1: substrate

2 : 하측 유전체 보호막(제1 보호층)2: lower dielectric protective film (first protective layer)

3 : 상변화형 기록층3: phase change recording layer

4 : 상측 유전체 보호막(제2 보호층)4: upper dielectric protective film (second protective layer)

5 : 금속 반사막5: metal reflective film

6 : 보호막6: protective film

7 : 그루브7: groove

8 : 랜드8: land

이하, 본 발명의 실시 형태를 도면을 기초로 하여 설명한다. 도1은 본 발명의 제1 실시 형태에 관한 상변화형 광디스크(1A)의 구조를 나타내는 개략 단면도이다. EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing. 1 is a schematic sectional view showing the structure of a phase change type optical disc 1A according to a first embodiment of the present invention.

본 제1 실시 형태에 의한 상변화형 광디스크(1A)는 CD-RW 타입인 디스크이며, 데이터를 기록할 수 있고, 또한 재기입도 가능하다. 그 구조는 생분해성 수지로 이루어지는 기판(1) 상에 40 ㎚ 내지 80 ㎚인 막 두께인 하측 유전체 보호막(제1 보호층)(2), 10 ㎚ 내지 40 ㎚인 막 두께인 상변화형 기록층(3), 하측 유전체 보호막(2)보다 열전도율이 높은 막 두께 10 ㎚ 내지 40 ㎚의 상측 유전체 보호막(제2 보호층)(4), 막 두께 20 ㎚ 내지 40 ㎚인 금속 반사막(5), 보호막(6)이 이 순서로 적층되어 형성되어 있다. 기판(1)에는 트래킹용 그루브(7)가 사출 성형법에 의해 형성되고, 그루브(7) 사이에 랜드(8)가 형성되어 있다. The phase change type optical disc 1A according to the first embodiment is a CD-RW type disc, which can record data and rewrite. Its structure is a lower dielectric protective film (first protective layer) 2 having a film thickness of 40 nm to 80 nm and a phase change recording layer having a film thickness of 10 nm to 40 nm on the substrate 1 made of biodegradable resin. (3), an upper dielectric protective film (second protective layer) 4 having a film thickness of 10 nm to 40 nm having a higher thermal conductivity than the lower dielectric protective film 2, a metal reflective film 5 having a film thickness of 20 nm to 40 nm, and a protective film. (6) is laminated | stacked and formed in this order. A tracking groove 7 is formed in the substrate 1 by an injection molding method, and lands 8 are formed between the grooves 7.

기판(1)은 환경 등을 고려하여, 자연계에 있어서 분해 가능한 기재인 생분해 수지에 의해, 소위 일체적으로 형성된 사출 성형 수지 기판이다. The board | substrate 1 is what is called injection molding resin board | substrate integrally formed with the biodegradable resin which is a base material which can decompose | disassemble in nature, in consideration of environment.

자연계에서 분해되는 수지는 미생물로 분해되는 생분해 수지나 수분이나 자외선 등으로 분해되는 수지이며, 투명성을 겸비한 생분해성 수지로서, 예를 들어 옥수수로부터 추출되는 폴리유산을 주원료로 한 수지가 대표적이며, 예를 들어 토요타 자동차제인「랙티(상품명)」, 미쯔이 화학제인「레이시아(상품명)」및 유니티카제인「테라맥(상품명)」등이 있다. 이러한 기판(1)의 두께는 0.5 ㎜ 내지 2.0 ㎜ 정도가 된다. 또한, 본 실시 형태에 있어서의 CD-RW 타입인 광디스크는 기판의 두께가 1.2 ㎜이다. 또한, 기록 재생에 이용되는 레이저의 파장은 780 ㎚, 트랙 피치는 1.6 ㎛이다. Resins decomposed in nature are biodegradable resins decomposed by microorganisms or resins decomposed by moisture or ultraviolet rays, and are biodegradable resins having transparency, for example, resins containing polylactic acid extracted from corn as a main raw material. For example, Toyota Motor Co., Ltd. is made of Lacti (trade name), Mitsui Chemicals from Lasia (trade name), and Unity Kaze (Terramac). The thickness of such a substrate 1 is about 0.5 mm to 2.0 mm. In the CD-RW type optical disc in the present embodiment, the substrate has a thickness of 1.2 mm. The wavelength of the laser used for recording and reproduction is 780 nm, and the track pitch is 1.6 mu m.

기록층(3)에는 AgInSbTe 또는 GeSbTe 상변화층이 이용되고, 금속 반사막(5)에는 산소나 물 등으로 자연계에 있어서 분해되는 재료 및/또는 자연계에 존재하는 재료 중 인체에 대해 유독하거나 폐기시에 주의를 필요로 하는 물질은 이용하지 않는다. 여기서 유독하다는 물질은 인체에 대해 명백하게 발암성 및 중독 증상을 일으키는 것을 가리키고 이 외에 특히 토양 오염, 수질 기준, 폐기 등에 있어서 일정한 기준치가 설정되는 물질의 주의를 필요로 하는 물질로 하고, 이것은 재료로서 사용하지 않는 것이 바람직하다. 예를 들어, 알루미늄 및 철의 단층막 또는 다층막 혹은 그 합금이 이용된다. 알루미늄의 박막의 막 두께는 40 ㎚이다. 또한, 철을 이용하는 경우에는 반사율이 낮기 때문에 철의 박막에 산화규소(SiO2)의 박막 및 실리콘의 박막을 적층시킨 다층막을 이용하면 좋다. 예를 들어, 철의 박막의 막 두께는 150 ㎚, 산화규소는 100 ㎚, 실리콘은 45 ㎚이다. 보호층(6)은, 예를 들어 생분해성 수지를 스핀 코팅하여 도포 설치한 후 도포막을 경화시켜 형성할 수 있다. The AgInSbTe or GeSbTe phase change layer is used for the recording layer 3, and the metal reflective film 5 is toxic or discarded to the human body among materials decomposed in nature by oxygen or water and / or materials existing in the nature. Do not use substances that require your attention. In this case, the toxic substance indicates the carcinogenic and toxic symptoms that are apparent to the human body, and in addition to this, the substance that requires the attention of a substance having a certain standard value is set in particular for soil contamination, water quality standards, disposal, etc., which is used as a material. It is desirable not to. For example, a single layer film or a multilayer film or an alloy thereof of aluminum and iron is used. The film thickness of the thin film of aluminum is 40 nm. In the case of using iron, since the reflectance is low, a multilayer film obtained by laminating a thin film of silicon oxide (SiO 2 ) and a thin film of silicon may be used. For example, the film thickness of the iron thin film is 150 nm, silicon oxide is 100 nm, and silicon is 45 nm. The protective layer 6 can be formed by, for example, spin-coating a biodegradable resin to apply a coating and curing the coating film.

본 발명은, 상술한 바와 같이 기판(1)측의 하부 유전체 보호막(2)에 열전도율이 낮은 재료를 적층하고, 보호층(6)측의 상부 유전체 보호막(4)에 열전도율이 높은 것을 형성하고, 기판(1)측으로의 열의 전달을 적게 하는 것이다. In the present invention, a material having low thermal conductivity is laminated on the lower dielectric protective film 2 on the substrate 1 side as described above, and a high thermal conductivity is formed on the upper dielectric protective film 4 on the protective layer 6 side. The transfer of heat to the substrate 1 side is reduced.

여기서, 하부 유전체 보호막(2)의 막 두께를 60 ㎚, 기록층(3)의 막 두께를 20 ㎚, 상부 유전체 보호막(4)의 막 두께를 40 ㎚, 반사층(5)의 막 두께를 20 ㎚로 하고, 유전체 보호막(2, 4)의 열전도율을 10 W/mㆍK로 하고, 기록층(3)이 기록 온도가 되었을 때의 하부 유전체 보호막(2)측 하에서의 온도 분포를 시뮬레이션하였다. Here, the film thickness of the lower dielectric protective film 2 is 60 nm, the film thickness of the recording layer 3 is 20 nm, the film thickness of the upper dielectric protective film 4 is 40 nm, and the film thickness of the reflective layer 5 is 20 nm. The thermal conductivity of the dielectric protective films 2 and 4 was set to 10 W / m · K, and the temperature distribution under the lower dielectric protective film 2 side when the recording layer 3 reached the recording temperature was simulated.

도3은 시뮬레이션시에 있어서의 유전체의 열전도율이 10 W/mㆍK일 때의 30 ℃마다 온도 분포 상태를 나타내는 모식도이다. Fig. 3 is a schematic diagram showing the temperature distribution at every 30 ° C when the thermal conductivity of the dielectric during the simulation is 10 W / m · K.

이때, 고온 부분은 120 ℃가 되고, 일반의 폴리카보네이트의 열변형 온도는 120 ℃이므로, 이 상태에서 기판(1)의 재질이 폴리카보네이트이면 문제는 없다. 그러나, 생분해성 수지제의 기판(1)에서는 생분해성 수지의 유리 전이 온도 60 ℃를 넘어 버리는 것을 알 수 있다. 그래서, 기록층(3)의 후방측(레이저광이 조사되는 측으로부터 보아) 상부 유전체 보호막(4)의 열전도율을 변화시켜 고온 부분의 온도를 플롯하였다. At this time, since the high temperature part becomes 120 degreeC and the heat distortion temperature of general polycarbonate is 120 degreeC, if the material of the board | substrate 1 is polycarbonate in this state, there will be no problem. However, it turns out that the glass transition temperature of biodegradable resin exceeds 60 degreeC in the board | substrate 1 made of biodegradable resin. Thus, the thermal conductivity of the upper dielectric protective film 4 on the rear side of the recording layer 3 (as seen from the side to which the laser light is irradiated) was changed to plot the temperature of the high temperature portion.

도4는 기록층(3)의 후방측의 상부 유전체 보호막(4)의 열전도율과 온도의 관계를 나타내는 특성도이다. 열전도율을 높게 해 가면 열전도율 100 W/mㆍK에서 60 ℃로 열변형 온도 이하가 되는 것을 알 수 있다. 따라서, 기록층(3)의 후방측과 접하는 상부 유전체 보호막(4)은 열전도율 100 W/mㆍK 이상인 것이 바람직하다. 4 is a characteristic diagram showing the relationship between the thermal conductivity and the temperature of the upper dielectric protective film 4 on the rear side of the recording layer 3. It can be seen that when the thermal conductivity is increased, the thermal deformation temperature is lower than or equal to 60 ° C. at the thermal conductivity of 100 W / m · K. Therefore, the upper dielectric protective film 4 in contact with the rear side of the recording layer 3 is preferably at least 100 W / m · K thermal conductivity.

그래서, 본 발명의 제1 실시 형태로서는 하부 유전체 보호막(2)에 SiO2(열전도율 ＝ 6.8 W/mㆍK), SiO2 － ZnS(7 W/mㆍK 내지 13 W/mㆍK), TiO2(9 W/mㆍK), Al2O3(26 W/mㆍK) 등의 열전도율이 10 W/mㆍK 이하의 저열전도율 재료를 이용한다. 이에 의해, 기판(1)으로의 단열 효과를 얻을 수 있다. 이 하부 유전체 보호막(2) 상에 기록층(3)을 형성하고, 고열전도율의 상부 유전체 보호막(4)을 형성한다. 이 상부 유전체 보호막(4)의 구체적인 재료는 AlN(150 W/mㆍK)이나 순SiN(100 W/mㆍK 이상)이다. 이에 의해 기판(1)의 온도 상승을 억제하고, 기판(1)의 변형을 방지할 수 있다. Thus, SiO 2 (Thermal Conductivity = 6.8 W / m and K), SiO 2 in the first embodiment the lower dielectric protective film (2) The form of the invention － Thermal conductivity of ZnS (7 W / mK-13 W / mK), TiO 2 (9 W / mK), Al 2 O 3 (26 W / mK), etc. is 10 W / mK The following low thermal conductivity materials are used. Thereby, the heat insulation effect to the board | substrate 1 can be acquired. The recording layer 3 is formed on the lower dielectric protective film 2, and the upper dielectric protective film 4 of high thermal conductivity is formed. Specific materials of the upper dielectric protective film 4 are AlN (150 W / m · K) or pure SiN (100 W / m · K or more). Thereby, the temperature rise of the board | substrate 1 can be suppressed and the deformation | transformation of the board | substrate 1 can be prevented.

상기한 바와 같이, 본 발명의 상변화형 광디스크는 기록시 등의 레이저광에 의한 온도 상승을 기판에 전달하기 어렵고, 생분해성 수지로 이루어지는 기판을 이용해도 반복 기록에 의한 기판의 변형 등을 방지할 수 있다. 그리고, 폐기시에는 대부분이 자연계에 있어서 분해되는 재료를 이용하여 디스크를 구성하고 있으므로 환경이 우수한 광디스크를 제공할 수 있다. 단, 상기한 실시 형태에 있어서는 상변화형 기록층(3)의 재료에는 독성이 강해 폐기시에 주의를 갖는 물질이 포함된다. 그러나, 상변화형 기록층(3)의 재료의 중량을 많게 보아도 0.0015 g 정도이다. 이에 대해, 기판(1)의 무게만으로도 15 g 내지 16 g 정도이다. 이 경우, 상변화형 기록층(3)의 디스크 전체의 중량에 대한 함유비는 0.00974 ％ 정도가 된다. 이 비율로부터 대부분의 재료를 자연계에서 분해시킬 수 있으므로 기판이 폴리카보네이트인 종래의 광디스크에 비해 환경이 우수한 디스크를 제공할 수 있다. As described above, the phase change type optical disc of the present invention is difficult to transmit the temperature rise by the laser light at the time of recording to the substrate, and it is possible to prevent deformation of the substrate due to repetitive recording or the like even when using a substrate made of biodegradable resin. Can be. When the disc is disposed, the disc is made of a material that is mostly decomposed in nature, so that an optical disc having excellent environment can be provided. In the above-described embodiment, however, the material of the phase change recording layer 3 contains a substance which is highly toxic and which has a caution upon disposal. However, even when the weight of the material of the phase change recording layer 3 is large, it is about 0.0015 g. In contrast, only the weight of the substrate 1 is about 15 g to 16 g. In this case, the content ratio with respect to the weight of the whole disk of the phase change recording layer 3 is about 0.00974%. From this ratio, since most materials can be decomposed in nature, it is possible to provide a disk having an excellent environment compared to a conventional optical disk whose substrate is polycarbonate.

다음에, 본 발명의 제2 실시 형태인 광디스크(1B)에 대해 도2를 이용하여 설명한다. 또한, 제1 실시 형태와 동일 부분에는 동일 부호를 붙이고, 설명의 중복을 피하기 위해 여기서는 그 설명을 할애한다. Next, an optical disc 1B according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment, and the description is given here in order to avoid duplication of description.

본 제2 실시 형태는, 제1 실시 형태에 있어서의 상부 유전체 보호막(4) 대신에 직접 반사층(5a)을 형성한 것이다. 이 반사층(5a)은 방열 기능을 갖고, 반사 방열층이 된다. 반사층(5a)(반사 방열층)에 이용되는 재료는 Al(235 W/mㆍK), Cu(401 W/mㆍK), Au(318 W/mㆍK), Ag(428 W/mㆍK), SiC(500 W/mㆍK) 등 매우 열전도율이 높은 재료이다. 이때, 반사층(5a)(반사 방열층)은 높은 방열 기능을 갖는 동시에 최적의 재생 신호를 얻기 위해 65 ％ 이상의 반사율이 필요하다. 그래서, 고반사율인 Al을 형성한 후, 또한 고열전도율의 재료를 형성하고, Al의 막 두께로 반사율을 조정하는 것도 가능하다. 또한, 기록층(3) 상에 얇은 구체적으로는 10 ㎚ 정도의 유전체층을 설치하고, 또한 이 위에 반사층과 방열층의 기능 양쪽을 겸하는 재료를 반사 방열층으로서 형성해도 좋다. In the second embodiment, the direct reflective layer 5a is formed in place of the upper dielectric protective film 4 in the first embodiment. This reflective layer 5a has a heat dissipation function and becomes a reflective heat dissipation layer. Materials used for the reflective layer 5a (reflective heat dissipation layer) include Al (235 W / mK), Cu (401 W / mK), Au (318 W / mK), Ag (428 W / m). K), SiC (500 W / mK) and the like are very high in thermal conductivity. At this time, the reflective layer 5a (reflective heat dissipation layer) has a high heat dissipation function and requires 65% or more of reflectance to obtain an optimal reproduction signal. Therefore, after forming Al which is high reflectance, it is also possible to form the material of high thermal conductivity, and to adjust reflectance by the film thickness of Al. In addition, a thin, specifically about 10 nm, dielectric layer may be provided on the recording layer 3, and a material serving as both a reflection layer and a heat dissipation layer may be formed thereon as the reflective heat dissipation layer.

다음에, 본 발명의 제3 실시 형태를 설명한다. 본 제3 실시 형태는 상변화형 광디스크로서 DVD-RW 디스크로 구성한 것이다. 도5는 본 발명의 제3 실시 형태인 DVD-RW 타입의 상변화형 광디스크(1C)의 구조를 설명하기 위한 개략 단면도이다. Next, a third embodiment of the present invention will be described. In the third embodiment, the phase change type optical disk is composed of a DVD-RW disk. Fig. 5 is a schematic cross-sectional view for explaining the structure of the DVD-RW type phase change optical disk 1C which is the third embodiment of the present invention.

본 제3 실시 형태에 나타내는 상변화형 광디스크(1C)도 제1 및 제2 실시 형태와 마찬가지로, 디스크 형상의 광투과성 기판(1) 상에 40 ㎚ 내지 80 ㎚인 막 두께의 하측 유전체 보호막(2), 10 ㎚ 내지 40 ㎚인 막 두께의 상변화형 기록층(3), 하측 유전체 보호막(2)보다 열전도율이 높은 막 두께 10 ㎚ 내지 40 ㎚인 상측 유전체 보호막(4), 막 두께 20 ㎚ 내지 40 ㎚인 금속 반사막(5), 보호막(6)이 이 순서로 적층되어 형성되어 있다. 기판(1)에는 트래킹용 그루브(7)가 사출 성형법에 의해 형성되고, 그루브(7) 사이에 랜드(8)가 형성되어 있다. Similarly to the first and second embodiments, the phase change type optical disk 1C shown in the third embodiment also has a lower dielectric protective film 2 having a film thickness of 40 nm to 80 nm on the disk-shaped transparent substrate 1. ), A phase change type recording layer 3 having a thickness of 10 nm to 40 nm, an upper dielectric protective film 4 having a thickness of 10 nm to 40 nm having a higher thermal conductivity than the lower dielectric protective film 2, and a film thickness of 20 nm to The metal reflecting film 5 and the protective film 6 which are 40 nm are laminated | stacked and formed in this order. A tracking groove 7 is formed in the substrate 1 by an injection molding method, and lands 8 are formed between the grooves 7.

상기한 바와 같이, 본 발명에서는 기판(1)측의 하부 유전체 보호막(2)에 열전도율이 낮은 재료를 적층하고, 보호층(6)측의 상부 유전체 보호막(4)에 열전도율이 높은 것을 형성하고, 기판(1)측으로의 열의 전달을 적게 하고 있다. As described above, in the present invention, a material having a low thermal conductivity is laminated on the lower dielectric protective film 2 on the substrate 1 side, and a high thermal conductivity is formed on the upper dielectric protective film 4 on the protective layer 6 side. The heat transfer to the board | substrate 1 side is reduced.

기판(1)은 환경 등 고려하여, 자연계에 있어서 분해 가능한 기재인 생분해 수지에 의해, 소위 일체적으로 형성된 사출 성형 수지 기판이다. The board | substrate 1 is injection molding resin board | substrate formed integrally with the biodegradable resin which is a base material which can decompose | disassemble in nature, considering environment, etc.

이 보호막(6)에 접착층(44)에 의해 수지 기판(10)이 접합된다. 수지 기판(10) 상에 도시는 하지 않지만 인쇄층이 설치되어 있다. 이 기판(10)도 환경 등을 고려하여, 자연계에 있어서 분해 가능한 기재인 생분해 수지에 의해, 소위 일체적으로 형성된 사출 성형 수지 기판이다. The resin substrate 10 is bonded to the protective film 6 by the adhesive layer 44. Although not shown, a printed layer is provided on the resin substrate 10. This board | substrate 10 is also what is called injection molding resin board | substrate formed integrally with the biodegradable resin which is a base material which can decompose | disassemble in nature, considering environment.

이 상변화형 광디스크는, 예를 들어 약 0.6 ㎜ 두께인 기판(1)과 동일하게 약 0.6 ㎜ 두께인 기판(10)을 접합한 측면 기록형 DVD-RW 디스크이며, 인쇄층측의 기판(10)은 기록 및 재생에 영향이 없는 더미 기판으로 되어 있다. 또한, 기판의 두께는 약 0.6 ㎜로 하고 있지만, 기판(1, 10)의 두께는 이용하는 수지의 굴절률에 의해 약간 다르다. 즉, 이용하는 수지의 굴절률에 의해 기판의 두께가 다르다. 이는 수지로서 폴리카보네이트를 이용하였을 때 기판의 두께를 0.6 ㎜로 하고, 이 폴리카보네이트의 굴절률(1.58)과 기판의 두께의 곱으로 동등해지도록 호환성 등을 확보하고 있기 때문이다. 생분해성 수지는 폴리카보네이트의 굴절률보다 작으므로 기판(1, 10)의 두께는 0.6 ㎜보다 2 ％ 전후방을 두껍게 하는 것이 바람직하다. 또한, 본 실시예에 있어서의 DVD-RW 타입인 광디스크는 접합한 후의 두께를 1.2 ㎜로 하였다. 또한, 기록 재생에 이용하는 레이저의 파장은 650 ㎚, 트랙 피치는 0.74 ㎛이다. The phase change type optical disc is, for example, a side recording type DVD-RW disc bonded to a substrate 10 having a thickness of about 0.6 mm in the same manner as the substrate 1 having a thickness of about 0.6 mm. The dummy substrate has a dummy substrate which does not affect recording and reproduction. In addition, although the thickness of the board | substrate is about 0.6 mm, the thickness of the board | substrates 1 and 10 differs slightly by the refractive index of resin used. That is, the thickness of a board | substrate changes with the refractive index of resin used. This is because when the polycarbonate is used as the resin, the thickness of the substrate is set to 0.6 mm, and compatibility and the like are ensured to be equal to the product of the refractive index (1.58) of the polycarbonate and the thickness of the substrate. Since the biodegradable resin is smaller than the refractive index of polycarbonate, it is preferable that the thickness of the board | substrates 1 and 10 thicken 2% back and front than 0.6 mm. In the DVD-RW type optical disc in the present embodiment, the thickness after bonding was 1.2 mm. The wavelength of the laser used for recording and reproduction is 650 nm, and the track pitch is 0.74 mu m.

이들 기판(1, 10), 하측 유전체 보호막(2), 상변화형 기록층(3), 상측 유전체 보호막(4), 반사막(5), 보호막(6)은 상기한 제1 실시 형태와 같은 재료 등으로 구성된다. 동일 구성에 대해서는 설명의 중복을 피하기 위해, 여기서는 그 설명을 할애한다. These substrates 1, 10, the lower dielectric protective film 2, the phase change recording layer 3, the upper dielectric protective film 4, the reflective film 5, and the protective film 6 are made of the same materials as those of the first embodiment described above. And the like. In order to avoid duplication of description about the same structure, the description is given here.

상기한 바와 같이, 본 발명의 상변화형 광디스크는 기록시 등의 레이저광에 의한 온도 상승을 기판에 전달하기 어렵고, 생분해성 수지로 이루어지는 기판을 이용해도, 반복 기록에 의한 기판의 변형 등을 방지할 수 있다. As described above, the phase change type optical disc of the present invention hardly transmits the temperature rise by the laser light at the time of recording to the substrate, and prevents deformation of the substrate due to repetitive recording or the like even when a substrate made of biodegradable resin is used. can do.

그런데, 상기한 접합 타입의 광디스크에 있어서, 접착층(44)으로서는 핫멜트형 접착제나 자외선 경화형 접착제 등을 이용할 수도 있지만, 기판이 토양 환원 가능한 환경이 우수한 기재를 이용한 경우에는 접착재도 토양 환원할 수 있는 것을 이용하는 쪽이 바람직하다. 이로 인해, 접착층(44)으로서 생분해성 접착재를 이용하면 좋다. 이 생분해성 접착재로서는 아교, 젤라틴 및 전분 등의 접착제 외에 유산계 수지를 이용할 수 있다. 예를 들어, 아교를 이용하는 경우에는, 아교 용액으로 하여 보호막(6) 상에 스핀 코팅 도포 설치한 후 보호막(6)과 기판(10)을 대향시켜 접착시키면 좋다. By the way, in the above-described bonding type optical disc, as the adhesive layer 44, a hot melt adhesive, an ultraviolet curable adhesive, or the like may be used. However, when the substrate is made of a substrate having excellent environment for reducing soil, the adhesive may also be reduced in soil. It is preferable to use. For this reason, the biodegradable adhesive material may be used as the adhesive layer 44. As this biodegradable adhesive, lactic acid resins can be used in addition to adhesives such as glue, gelatin and starch. For example, in the case of using a glue, after the spin coating is applied to the protective film 6 as a glue solution, the protective film 6 and the substrate 10 may be opposed to each other for adhesion.

상기한 바와 같이 구성함으로써, 대부분의 소재가 토양 환원 가능해져 환경 부하가 적은 간편한 폐기 수단의 제공이 가능해진다. By constructing as described above, most of the raw materials can be reduced in soil, thereby providing a simple disposal means with less environmental load.

또한, 상기한 생분해성 접착재로 이루어지는 접착층(44)에 분해 박테리아를 함유시키면, 폐기시에 토양 환원이 더욱 촉진된다. 분해 박테리아로서는, 예를 들어 유산균이나 효모균 등을 이용하면 좋다. In addition, when the decomposing bacteria are contained in the adhesive layer 44 made of the above biodegradable adhesive, soil reduction is further promoted at the time of disposal. As the decomposing bacteria, for example, lactic acid bacteria, yeast bacteria or the like may be used.

또한, 상기한 제3 실시 형태에 따르면, 접합되는 기판(1, 10)과 접착층(44)은 완전한 생분해성 수지만 구성할 수 있다. 이로 인해, 생분해의 가속 장치에 디스크를 넣으면 접착층(44)은 곧 분해되고, 2매의 기판은 박리하기 쉬워진다. 또한, 접착층에 분해 촉진의 균을 넣으면 보다 박리하기 쉬워진다. 이와 같이 구성하면, 한쪽 더미 기판을 간단하게 박리하여 남은 부분의 기판에 갖는 유해 부분을 깎아내는 등으로 하여 적정 처분도 용이하게 행할 수 있다. In addition, according to the third embodiment described above, the substrates 1 and 10 and the adhesive layer 44 to be bonded can only constitute complete biodegradable resins. For this reason, when a disk is put into the biodegradation acceleration apparatus, the adhesive layer 44 will decompose | disassemble immediately, and two board | substrates will become easy to peel. In addition, when the bacterium for promoting decomposition is put into the adhesive layer, the peeling becomes easier. If comprised in this way, proper disposal can also be performed easily by peeling one dummy board | substrate easily and scraping off the harmful part which a board | substrate of a remainder has, etc.

다음에, 본 발명의 제4 실시 형태를 설명한다. 본 제4 실시 형태는 양면 기록형 DVD-RW 타입에 적용한 구성이다. 도6은 본 발명의 제4 실시 형태인 광디스크(1D)의 구조를 설명하기 위한 개략 단면도이다. Next, a fourth embodiment of the present invention will be described. This fourth embodiment is a configuration applied to the double-sided recording type DVD-RW type. 6 is a schematic cross-sectional view for explaining the structure of the optical disk 1D which is the fourth embodiment of the present invention.

제4 실시 형태의 광디스크(1D)는 양면 기록형 DVD-RW 타입의 디스크이며, 이 광디스크는 주요면에 미세한 요철에 의해 정보를 나타내는 피트 또는 그루브가 형성된 기록 영역을 갖는 한 쌍의 투광성 기판(1, 1), 한 쌍의 투광성 기판(1, 1) 상에 40 ㎚ 내지 80 ㎚인 막 두께의 하측 유전체 보호막(2), 10 ㎚ 내지 40 ㎚인 막 두께의 상변화형 기록층(3), 하측 유전체 보호막(2)보다 열전도율이 높은 막 두께 10 ㎚ 내지 40 ㎚인 상측 유전체 보호막(4), 막 두께 20 ㎚ 내지 40 ㎚인 금속 반 사막(5), 보호막(6)이 이 순서로 각각 적층되어 형성되어 있다. 그리고, 한 쌍의 기판(1, 1)을 보호막(6, 6)끼리 서로 대향시켜 접합하고 있는 접착층(44)으로 구성되어 있다. The optical disk 1D of the fourth embodiment is a double-sided recording type DVD-RW type disk, which is a pair of light-transmitting substrates 1 having a recording area in which a pit or groove indicating information is formed on the main surface by minute irregularities. 1) a lower dielectric protective film 2 having a film thickness of 40 nm to 80 nm on the pair of translucent substrates 1 and 1, a phase change type recording layer 3 having a film thickness of 10 nm to 40 nm, An upper dielectric protective film 4 having a film thickness of 10 nm to 40 nm having a higher thermal conductivity than the lower dielectric protective film 2, a metal half desert 5 having a film thickness of 20 nm to 40 nm, and a protective film 6 are laminated in this order, respectively. It is formed. And the pair of board | substrates 1 and 1 are comprised by the contact bonding layer 44 which mutually opposes and bonds mutually.

이들 기판(1), 하측 유전체 보호막(2), 상변화형 기록층(3), 상측 유전체 보호막(4), 반사막(5), 보호막(6)은 상기한 제1 실시 형태와 같은 재료 등으로 구성된다. 동일 구성에 대해서는 설명의 중복을 피하기 위해, 여기서는 그 설명을 할애한다. These substrates 1, the lower dielectric protective film 2, the phase change type recording layer 3, the upper dielectric protective film 4, the reflective film 5, and the protective film 6 are made of the same materials as those of the first embodiment described above. It is composed. In order to avoid duplication of description about the same structure, the description is given here.

그런데, 상기한 제4 실시 형태에 관한 접합 타입의 광디스크에 있어서도, 접착층(44)으로서는 핫멜트형 접착제나 자외선 경화형 접착제 등을 이용할 수도 있지만, 기판이 토양 환원 가능한 환경이 우수한 기재를 이용한 경우에는 접착재도 토양 환원할 수 있는 것을 이용하는 쪽이 바람직하다. 이로 인해, 접착층(44)으로서 생분해성 접착재를 이용하면 좋다. 이 생분해성 접착재로서는 아교, 젤라틴 및 전분 등의 접착제 외에 유산계 수지를 이용할 수 있다. 예를 들어, 아교를 이용하는 경우에는, 아교 용액으로 하여 보호막(6) 상에 스핀 코팅 등에 의해 도포 설치한 후 보호막(6)끼리 대향시켜 접착시키면 좋다. 이러한 구성이면, 양면의 기판(1)을 통하여 양면에 기록을 행하는 것이 가능하고, 디스크 1매의 용량이 커져 사용자의 편리성이 향상된다. By the way, also in the bonding type optical disk which concerns on said 4th Embodiment, although a hot melt adhesive, an ultraviolet curable adhesive, etc. can also be used for the contact bonding layer 44, when a board | substrate uses the base material which is excellent in the environment which can reduce a soil, an adhesive material is also used. It is preferable to use what can reduce soil. For this reason, the biodegradable adhesive material may be used as the adhesive layer 44. As this biodegradable adhesive, lactic acid resins can be used in addition to adhesives such as glue, gelatin and starch. For example, when using a glue, it is good to make a glue solution apply | coat and install on the protective film 6 by spin coating etc., and to make the protective film 6 oppose and adhere | attach. With such a configuration, it is possible to record on both sides via the double-sided board 1, and the capacity of one disk is increased, which improves the convenience of the user.

상기한 바와 같이 구성함으로써, 대부분의 소재가 토양 환원 가능해져 환경 부하가 적은 간편한 폐기 수단의 제공이 가능해진다. By constructing as described above, most of the raw materials can be reduced in soil, thereby providing a simple disposal means with less environmental load.

또한, 상기한 생분해성 접착재로 이루어지는 접착층(44)에 분해 박테리아를 함유시키면, 폐기시에 토양 환원이 더욱 촉진된다. 분해 박테리아로서는, 예를 들어 유산균이나 효모균 등을 이용하면 좋다. In addition, when the decomposing bacteria are contained in the adhesive layer 44 made of the above biodegradable adhesive, soil reduction is further promoted at the time of disposal. As the decomposing bacteria, for example, lactic acid bacteria, yeast bacteria or the like may be used.

생분해성 접착재에 분해 박테리아를 그대로 함유시킨 경우, 시간의 흐름에 따른 변화에 의해 접착층(44) 등이 폐기하고 있지 않음에도 불구하고 분해되는 일이 있다. 그래서, 도7에 내구성을 보다 향상시킨 광디스크를 도시한다. 도7은 본 발명의 제5 실시 형태의 광디스크(1E)를 도시하는 모식적 단면도이다. 또한, 도5와 같은 구성인 부분에는 동일 부호를 붙이고, 설명의 중복을 피하기 위해 여기서는 그 설명을 할애한다. In the case where the biodegradable adhesive material contains the degrading bacteria as it is, the adhesive layer 44 may be decomposed by the change over time even though the adhesive layer 44 and the like are not discarded. Thus, Fig. 7 shows an optical disc with further improved durability. Fig. 7 is a schematic sectional view showing the optical disc 1E of the fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of FIG.

본 도7에 도시하는 광디스크(1E)는, 도5에 나타내는 제3 실시 형태에 있어서 접착제층(44)을 생분해성 접착재를 주체로 하고, 그 생분해성 접착재층 중에 분해 박테리아가 내부에 봉입된 마이크로 캡슐(41)을 혼입한 것이다. 이로 인해, 마이크로 캡슐(41)을 파괴하지 않는 한, 분해 박테리아에 의한 분해는 행해지지 않고 내구성이 향상된다. 폐기하였을 때에는, 광디스크를 절곡하는 등 파손시킴으로써 마이크로 캡슐(41)의 캡슐벽이 파손되어 토양 환원이 촉진된다. In the third embodiment shown in Fig. 7, the optical disk 1E mainly comprises a biodegradable adhesive material mainly in the adhesive layer 44, and microorganisms in which decomposed bacteria are enclosed in the biodegradable adhesive material layer. The capsule 41 is mixed. For this reason, as long as the microcapsules 41 are not destroyed, decomposition by the decomposing bacteria is not performed, and durability is improved. When discarded, the capsule wall of the microcapsule 41 is broken by bending or breaking the optical disc to promote soil reduction.

혼입시키는 마이크로 캡슐(41)은, 예를 들어 유산균을 젤라틴 코팅함으로써 형성하면 좋다. The microcapsules 41 to be mixed may be formed by, for example, gelatin coating of lactic acid bacteria.

상기한 도7에 나타내는 실시 형태에 있어서는, 한 면에 하나의 기록 영역을 마련하고 있지만 제4 실시 형태에도 적용할 수 있고, 또한 이것으로 한정되지 않고 한 면에 2개의 기록층을 갖는 것 등 복수의 기록층을 갖는 것에도, 본 발명은 적용할 수 있다. 또한, 도6의 디스크(1D)에 있어서는 DVD-RW끼리 접합시키는 경우를 나타냈다. 그러나, 접합하는 것을 DVD-RW로 한정되는 것은 아니고 제1 및 제2 실시예에서 나타낸 CD-RW라도 좋고, 또한 한쪽은 제1 및 제2 실시예와 같은 CD-RW로 접합하는 것이 제3 및 제4 실시예에서 나타낸 더미 기판의 부분인 DVD-RW를 접합해도 좋다. 또한, 한쪽이 CD-RW 혹은 DVD-RW로 접합하는 것이 재생 전용 ROM 매체(DVD-ROM, CD-ROM 등)이라도 좋다. 이에 의해 한쪽은 재생 매체, 한쪽이 추기 매체인 환경 부하가 적은 광디스크의 제공이 가능해진다. In the above-described embodiment shown in Fig. 7, one recording area is provided on one surface, but the present invention is also applicable to the fourth embodiment, and is not limited to this. The present invention can also be applied to having a recording layer of. In addition, in the disk 1D of FIG. 6, the case where DVD-RWs are joined together is shown. However, the bonding is not limited to the DVD-RW, but may be the CD-RW shown in the first and second embodiments, and the bonding to the same CD-RW as the first and second embodiments is carried out in the third and third embodiments. The DVD-RW which is a part of the dummy substrate shown in the fourth embodiment may be joined. In addition, one end may be connected to a CD-RW or a DVD-RW, for example, a reproduction-only ROM medium (DVD-ROM, CD-ROM, etc.). As a result, it is possible to provide an optical disk with less environmental load, one of which is a reproducing medium and one of which is a recording medium.

또한, 본 발명은 상기 실시 형태에 있어서 개시한 재료 및 막 구성으로 한정되는 것은 아니고, 레이저광에 의해 기록층에서 발생한 열이 유전체층을 통하여 생분해성 수지로 이루어지는 기판에 영향을 부여하지 않도록 열전도율이 다른 유전체를 기록층의 상하로 갖고, 기판과는 반대측에 고열전도율의 유전체층 혹은 금속막 혹은 이들 적층막으로 이루어지는 층을 갖고, 열을 기판과는 반대측에 효율적으로 전도시키는 구조이면 좋다. In addition, the present invention is not limited to the materials and film configurations disclosed in the above embodiments, and the thermal conductivity is different so that heat generated in the recording layer by laser light does not affect the substrate made of biodegradable resin through the dielectric layer. It is sufficient to have a structure having dielectrics above and below the recording layer, having a high thermal conductivity dielectric layer, a metal film or a layer made of these laminated films on the side opposite to the substrate, and efficiently conducting heat to the side opposite to the substrate.

또한, 상기한 DVD-RW 규격인 광디스크로 한정되지 않고, 차세대 DVD 규격의 HD DVD 규격인 기판 두께 0.6 ㎜인 것을 접합하여 1.2 ㎜ 두께로 하고, 레이저 파장 405 ㎚, 트랙 피치 0.34 ㎛인 구조의 디스크에도 본 발명은 적용할 수 있다. In addition, the disc is not limited to the optical disc of the DVD-RW standard described above, but the substrate having a thickness of 0.6 mm is bonded to a substrate thickness of 0.6 mm, which is an HD DVD standard of the next-generation DVD standard, and has a laser wavelength of 405 nm and a track pitch of 0.34 μm. The present invention can also be applied.

또한, 본 발명은 생분해성 기판을 이용하여 기록층 상에 0.1 ㎜의 커버층을 형성하고, 커버층측으로부터 기록 재생을 행하는 Blu-ray(B1u-ray는 등록 상표) 방식의 매체에 있어서도 기판 재료나, 기록층을 협지하여 형성되는 유전체의 조건 및 접합 재료를 적응하는 것이 가능하다. The present invention also provides a substrate material for a Blu-ray (B1u-ray registered trademark) medium in which a cover layer of 0.1 mm is formed on a recording layer using a biodegradable substrate, and recording and reproduction are performed from the cover layer side. It is possible to adapt the conditions of the dielectric and the bonding material formed by sandwiching the recording layer.

Claims (8)

생분해성 수지로 이루어지는 기판과, 이 기판 상에 설치된 제1 보호층과, 이 제1 보호층 상에 설치된 상변화형 기록층과, 이 기록층 상에 설치된 제2 보호층을 구비하는 상변화형 광디스크에 있어서, 기판측의 상기 제1 보호층은 열전도율이 낮은 재료로 형성되고, 상기 제2 보호층은 제1 보호층보다 열전도율이 높은 재료로 형성되어 있는 것을 특징으로 하는 상변화형 광디스크. A phase change type comprising a substrate made of biodegradable resin, a first protective layer provided on the substrate, a phase change recording layer provided on the first protective layer, and a second protective layer provided on the recording layer. An optical disc, wherein the first protective layer on the substrate side is formed of a material having a low thermal conductivity, and the second protective layer is formed of a material having a higher thermal conductivity than the first protective layer. 제1항에 있어서, 상기 제2 보호층의 열전도율은 100 W/mㆍK 이상인 것을 특징으로 하는 상변화형 광디스크. The phase change type optical disc according to claim 1, wherein a thermal conductivity of the second protective layer is 100 W / m · K or more. 제1항에 있어서, 상기 제2 보호층은 열전도율이 높고 고반사율의 금속 반사층인 것을 특징으로 하는 상변화형 광디스크. The phase change type optical disc of claim 1, wherein the second protective layer is a metal reflective layer having high thermal conductivity and high reflectance. 적어도 한쪽에 기록층을 갖는 2매의 생분해성 수지로 이루어지는 기판을 접합한 상변화형 광디스크에 있어서, 적어도 한쪽의 기판에는 제1 보호층과, 이 제1 보호층 상에 설치된 상변화형 기록층과, 이 기록층 상에 설치된 제2 보호층을 구비하고, 상기 기판측의 상기 제1 보호층은 열전도율이 낮은 재료로 형성되고, 상기 제2 보호층은 제1 보호층보다 열전도율이 높은 재료로 형성되어 있는 것을 특징으로 하는 상변화형 광디스크. A phase change type optical disc comprising a substrate made of two biodegradable resins having at least one recording layer, wherein at least one substrate has a first protective layer and a phase change type recording layer provided on the first protective layer. And a second protective layer provided on the recording layer, wherein the first protective layer on the substrate side is formed of a material having a low thermal conductivity, and the second protective layer is formed of a material having a higher thermal conductivity than the first protective layer. A phase change type optical disc, characterized in that formed. 제4항에 있어서, 상기 제2 보호층의 열전도율은 100 W/mㆍK 이상인 것을 특징으로 하는 상변화형 광디스크. The phase change type optical disc according to claim 4, wherein the thermal conductivity of the second protective layer is 100 W / m · K or more. 제4항에 있어서, 상기 제2 보호층은 열전도율이 높고 고반사율의 금속 반사층인 것을 특징으로 하는 상변화형 광디스크. The phase change type optical disc according to claim 4, wherein the second protective layer is a metal reflective layer having high thermal conductivity and high reflectance. 제4항 내지 제6항 중 어느 한 항에 있어서, 상기 기재를 생분해성 접착제를 주성분으로 하는 접착층에 의해 접합한 것을 특징으로 하는 상변화형 광디스크. The phase change type optical disk according to any one of claims 4 to 6, wherein the substrate is bonded by an adhesive layer containing a biodegradable adhesive as a main component. 제7항에 있어서, 상기 접착층에 분해 박테리아를 함유시킨 것을 특징으로 하는 상변화형 광디스크. The phase change type optical disc according to claim 7, wherein the adhesive layer contains decomposing bacteria.
KR1020067008197A 2003-09-29 2004-09-28 Phase-change optical disk KR20060113905A (en)

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JP4000655B2 (en) * 1998-02-26 2007-10-31 日立化成工業株式会社 Film-like adhesive for circuit connection, circuit board and IC card
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