KR100636113B1 - Optical disk - Google Patents

Optical disk Download PDF

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Publication number
KR100636113B1
KR100636113B1 KR1019990050217A KR19990050217A KR100636113B1 KR 100636113 B1 KR100636113 B1 KR 100636113B1 KR 1019990050217 A KR1019990050217 A KR 1019990050217A KR 19990050217 A KR19990050217 A KR 19990050217A KR 100636113 B1 KR100636113 B1 KR 100636113B1
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South Korea
Prior art keywords
incident light
recording
layer
light
masking layer
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KR1019990050217A
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Korean (ko)
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KR20010046441A (en
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노명도
유장훈
황인오
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삼성전자주식회사
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Priority to KR1019990050217A priority Critical patent/KR100636113B1/en
Publication of KR20010046441A publication Critical patent/KR20010046441A/en
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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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • 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
    • G11B11/10502—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 characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
    • 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
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
    • 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
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • G11B11/10589—Details
    • G11B11/10591—Details for improving write-in properties, e.g. Curie-point temperature
    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24047—Substrates
    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24065—Layers assisting in recording or reproduction below the optical diffraction limit, e.g. non-linear optical layers or structures
    • 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
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B2007/25408—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of inorganic materials
    • G11B2007/25411—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
    • 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
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B2007/25408—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of inorganic materials
    • G11B2007/25414—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of inorganic materials containing Group 13 elements (B, Al, Ga)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

입사광의 온도에 따라 반사율 특성이 변하는 마스킹(masking)층을 갖는 다층 구조의 광디스크가 개시되어 있다.Disclosed is a multi-layered optical disc having a masking layer whose reflectance characteristics change with temperature of incident light.

이 개시된 광디스크는 입사광이 투과되는 투명기판과; 투명기판에 적층 형성되며, 집속된 광에 의해 정보신호의 기록과 재생이 이루어지는 복수의 기록막과; 기록막들 사이에 배치되며, 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고, 소정 온도 이하에서는 입사광을 투과시키는 적어도 하나의 마스킹층과; 마스킹층을 투과한 광이 투과되며, 복수의 기록막들 사이 간격을 유지하는 스페이서층;을 포함하는 것을 특징으로 한다.The disclosed optical disc includes a transparent substrate through which incident light is transmitted; A plurality of recording films formed on the transparent substrate and stacked on the transparent substrate to record and reproduce information signals by focused light; At least one masking layer disposed between the recording films and selectively masked according to the temperature of the incident light to change into a reflecting member at a predetermined temperature or more to reflect the incident light, and to transmit the incident light below the predetermined temperature; And a spacer layer through which the light passing through the masking layer is transmitted and maintaining a gap between the plurality of recording films.

Description

광디스크{Optical disk}Optical disk

도 1은 종래의 일예에 따른 이층 구조를 갖는 광디스크를 보인 단면도.1 is a cross-sectional view showing an optical disk having a two-layer structure according to a conventional example.

도 2는 본 발명의 일 실시예에 따른 광디스크를 보인 단면도.2 is a cross-sectional view showing an optical disk according to an embodiment of the present invention.

도 3은 본 발명의 다른 실시예에 따른 광디스크를 보인 단면도.3 is a cross-sectional view showing an optical disk according to another embodiment of the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

31...대물렌즈 41...고체침적미러31.Objective lens 41.Solid deposition mirror

110, 290...기판 120, 210...제1기록막110, 290 ... substrate 120, 210 ... first recording film

121, 211...제1상부유전체층 123, 213...제1기록층121, 211 ... First upper dielectric layer 123, 213 ... First recording layer

125, 215...제1하부유전체층 130, 220...제1마스킹(masking)층125, 215 ... first lower dielectric layer 130, 220 ... first masking layer

135, 165, 195, 225, 255, 285...서보 마크135, 165, 195, 225, 255, 285 ... Servo Mark

140, 230...제1스페이서 150, 240...제2기록막140, 230 ... First spacer 150, 240 ... Second recording film

160, 250...제2마스킹층 161, 191, 251...반사영역160, 250 ... 2nd masking layer 161, 191, 251 ... reflective area

170, 260...제2스페이서 180, 270...제3기록막170, 260 ... second spacer 180, 270 ... third recording film

190, 280...제3마스킹층190, 280 ... 3rd masking layer

본 발명은 이층 또는 그 이상의 정보 기록층을 갖는 광디스크에 관한 것으로서, 상세하게는 입사광의 온도에 따라 반사율 특성이 변하는 마스킹(masking)층을 갖는 광디스크에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc having two or more information recording layers, and more particularly, to an optical disc having a masking layer whose reflectance characteristics change depending on the temperature of incident light.

일반적으로 한 장의 광디스크에 기록되는 정보 기록 용량을 증대시키기 위한 일 방편으로 광디스크는 이층 또는 그 이상의 정보 기록층을 포함하도록 다층화되고 있다.In general, as one way to increase the information recording capacity recorded on one optical disc, the optical disc is multilayered to include two or more information recording layers.

종래의 이층 광디스크의 일 예를 도 1을 참조하여 설명한다. 도시된 바와 같이, 광이 조사되는 쪽으로부터, 투명한 제1기판(11), 정보 기록면을 갖는 제1기록층(13), 제1접합층(15), 스페이서(17), 제2접합층(19), 제2기록층(21) 및 제2기판(23)으로 구성된다.An example of a conventional two-layer optical disc will be described with reference to FIG. As shown, from the side to which light is irradiated, the transparent first substrate 11, the first recording layer 13 having the information recording surface, the first bonding layer 15, the spacer 17, and the second bonding layer ( 19), the second recording layer 21 and the second substrate 23. As shown in FIG.

제1기판(11)은 1mm 두께의 투명한 PVC로 되어 있으며, 입사광을 투과시킨다. 제1기록층(13)은 자외선 경화수지로 되어 있으며, 상기 제1기판(11)의 일측에 형성된다. 이 제1기록층(13)에는 트랙을 이루는 나선형의 랜드(13a)와, 그루브(13b)가 형성되어 있다. 상기 제1기록층(13)의 제1접합층(15)쪽 면(14)에는 입사광을 부분적으로 투과시킬 수 있도록 된 반투막이 형성되어 있다. 이 반투막으로는 ZnSe(zinc selenide), BiO(bismuth oxide), CdS(cadmium sulphide), CdTe(cadmium telluride), SiC(silicon carbide) 등이 제안된다. The first substrate 11 is made of transparent PVC having a thickness of 1 mm and transmits incident light. The first recording layer 13 is made of an ultraviolet curable resin and is formed on one side of the first substrate 11. In the first recording layer 13, spiral lands 13a and grooves 13b constituting tracks are formed. A semi-permeable membrane is formed on the surface 14 toward the first bonding layer 15 of the first recording layer 13 to partially transmit incident light. ZnSe (zinc selenide), BiO (bismuth oxide), CdS (cadmium sulphide), CdTe (cadmium telluride), SiC (silicon carbide) and the like are proposed as the semipermeable membrane.

또한, 상기 제2기록층(21)은 상기 제1기록층(13)과 동일한 구성을 가지며, 제2접합층(19)과 마주하는 면(20)은 대략 90%의 반사율을 갖는 반사층이 형성되어 있다. 상기 제1 및 제2접합층(15)(19)과 상기 스페이서(17)는 상기 제1기록층(13) 과 제2기록층(21)의 접합 및 사이 간격 유지를 위한 것으로 입사광을 투과시킨다. 상기 제2기판(23)은 투명한 PVC로 된 기판으로 상기 제2기록층(21)을 보호한다.In addition, the second recording layer 21 has the same configuration as the first recording layer 13, and the surface 20 facing the second bonding layer 19 is formed with a reflective layer having a reflectance of approximately 90%. It is. The first and second bonding layers 15 and 19 and the spacers 17 are for bonding the first recording layer 13 and the second recording layer 21 and maintaining the gap therebetween, and transmit incident light. . The second substrate 23 is a transparent PVC substrate to protect the second recording layer 21.

상기한 바와 같이, 구성된 광디스크에 기록된 정보의 재생은 제1기판(11) 쪽에서 입사되는 대물렌즈(3)에 의해 집속된 빔(1)을 이용하여 수행된다. 즉, 대물렌즈(3)의 포커스 위치를 조정하여 집속된 빔(1)이 제1기록층(11)에 맺히도록 하여 제1기록층(11)에 기록된 정보를 재생하고, 대물렌즈(3)의 포커스 위치를 조정하여 제2기록층(19)에 빔(1')이 집속되도록 하여 제2기록층(19)에 기록된 정보를 재생할 수 있다.As described above, the reproduction of the information recorded on the configured optical disc is performed by using the beam 1 focused by the objective lens 3 incident on the first substrate 11 side. That is, by adjusting the focus position of the objective lens 3 so that the focused beam 1 is formed on the first recording layer 11, the information recorded in the first recording layer 11 is reproduced, and the objective lens 3 ), The beam 1 'is focused on the second recording layer 19 so that the information recorded on the second recording layer 19 can be reproduced.

상기한 바와 같이, 구성된 광디스크는 2층의 기록층(13)(19)을 포함하여 단층 기록 구조를 갖는 광디스크에 비하여 정보 기록밀도를 높일 수 있다는 이점이 있다. 반면, 종래의 광디스크는 상기 제1기록층(13)의 제1접합층(15)쪽 면(14)에 반투막을 형성하여 입사광을 부분적으로 투과 반사시킴으로써, 상기 두 기록층(13)(19)에 맺히는 광스폿의 광파워가 저하되는 단점이 있다.As described above, the configured optical disc has the advantage that the information recording density can be increased as compared with the optical disc having the single-layer recording structure including the two recording layers 13 and 19. On the other hand, in the conventional optical disk, the two recording layers 13 and 19 are formed by partially transflecting incident light by forming a semi-permeable membrane on the side 14 of the first bonding layer 15 of the first recording layer 13. There is a disadvantage that the optical power of the light spot formed in the lowering.

따라서, 본 발명은 상기한 바와 같은 점을 감안하여 안출된 것으로서, 각 기록막에 맺히는 광스폿의 파워가 저하되지 않도록 소정 온도 이상에서 입사광을 반사시키고 그 이하의 온도에서는 입사광을 투과시키는 마스킹층을 반사막 사이에 구비한 다층 구조의 광디스크를 제공하는데 그 목적이 있다.Accordingly, the present invention is conceived in view of the above-described point, and a masking layer for reflecting incident light at a predetermined temperature or more and transmitting incident light at a temperature below that in order not to lower the power of the light spot formed on each recording film. It is an object of the present invention to provide an optical disk having a multilayer structure provided between reflective films.

상기한 목적을 달성하기 위하여 본 발명은, 입사광이 투과되는 투명기판과; 상기 투명기판에 적층 형성되며, 집속된 광에 의해 정보신호의 기록과 재생이 이루어지는 복수의 기록막과; 상기 기록막들 사이에 배치되며, 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고, 소정 온도 이하에서는 입사광을 투과시키는 적어도 하나의 마스킹층과; 상기 마스킹층을 투과한 광이 투과되며, 상기 복수의 기록막들 사이 간격을 유지하는 스페이서층;을 포함하는 것을 특징으로 한다.In order to achieve the above object, the present invention is a transparent substrate through which incident light is transmitted; A plurality of recording films stacked on the transparent substrate and configured to record and reproduce information signals by focused light; At least one masking layer disposed between the recording films and selectively masked according to a temperature of incident light to change into a reflecting member at a predetermined temperature or more to reflect incident light, and to transmit incident light below a predetermined temperature; And a spacer layer through which the light passing through the masking layer is transmitted and maintaining a gap between the plurality of recording films.

또한, 본 발명은 기판과, 상기 기판에 적층 형성되며, 집속된 광에 의해 정보신호의 기록과 재생이 이루어지는 복수의 기록막과; 상기 기록막들 사이 및 상기 기록막과 상기 기판 사이에 배치되며, 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고, 소정 온도 이하에서는 입사광을 투과시키는 적어도 하나의 마스킹층과; 상기 마스킹층을 투과한 광이 투과되며, 상기 복수의 기록막들 사이 간격을 유지하는 스페이서층;을 포함하는 것을 특징으로 한다.In addition, the present invention provides a substrate, comprising: a plurality of recording films stacked on the substrate and configured to record and reproduce information signals by focused light; At least one disposed between the recording films and between the recording film and the substrate and selectively masked according to the temperature of incident light to change into a reflecting member at a predetermined temperature or more to reflect incident light, and to transmit incident light below a predetermined temperature A masking layer; And a spacer layer through which the light passing through the masking layer is transmitted and maintaining a gap between the plurality of recording films.

이하, 첨부된 도면들을 참조하여 본 발명의 바람직한 실시예들을 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일 실시예에 따른 3층 구조를 갖는 광 디스크를 보인 개략적인 단면도이다. 도시된 바와 같이, 광디스크는 파 필드(far field) 광학계에 적합한 광디스크 구조로서, 대물렌즈(31)에 의해 집속되는 입사광 쪽으로부터 순차로, 투명기판(110), 제1기록막(120), 제1마스킹(masking)층(130), 제1스페이서층(140), 제2기록막(150), 제2마스킹층(160), 제2스페이서(170), 제3기 록막(180), 제3마스킹층(190)을 포함하여 구성된다. 2 is a schematic cross-sectional view showing an optical disk having a three-layer structure according to an embodiment of the present invention. As shown, the optical disc is an optical disc structure suitable for a far field optical system, and the transparent substrate 110, the first recording film 120, and the first optical film are sequentially formed from the incident light focused by the objective lens 31. As shown in FIG. The first masking layer 130, the first spacer layer 140, the second recording film 150, the second masking layer 160, the second spacer 170, the third recording film 180, and the first masking layer 130 It comprises a three masking layer 190.

상기 투명기판(110)은 입사광이 투과되는 영역으로, 글래스 또는 폴리카보네이트 등의 재질로 구성된다.The transparent substrate 110 is a region through which incident light is transmitted and is made of a material such as glass or polycarbonate.

상기 제1기록막(120)은 상기 대물렌즈(31)가 포커싱되어 집속된 광에 의해 정보신호의 기록과 재생이 이루어지는 부분으로, 상기 기판(110)쪽으로부터 순차로 소정 굴절률을 갖는 제1상부유전체층(121), 제1기록층(123), 소정 굴절률을 갖는 제1하부유전체층(125)으로 구성된다. 상기 제1상,하부유전체층(121)(125) 각각은 대략 500Å 내지 2000Å 두께의 SiN, ZnS-SiO2 재질로 구성 될 수 있다.The first recording layer 120 is a portion in which the objective lens 31 is focused and focused on recording and reproducing an information signal. The first upper portion has a predetermined refractive index sequentially from the substrate 110. A dielectric layer 121, a first recording layer 123, and a first lower dielectric layer 125 having a predetermined refractive index. Each of the first and lower dielectric layers 121 and 125 may be formed of SiN and ZnS-SiO 2 materials having a thickness of about 500 mW to 2000 mW.

상기 제1기록층(123)은 입사광의 온도 및 냉각속도에 따라 결정질 상태와 비정질 상태 중 어느 한 상태를 갖는 방식으로 기록하는 상변화형 기록층 또는, 광자기 기록층으로 구성될 수 있다. 여기서, 상변화형 기록층은 대략 500Å 이하 두께를 갖는 GeSbTe계 재질로 구성 될 수 있다. 그리고, 광자기 기록층은 대략 500Å 이하의 두께를 갖는 TbFeCo계 재질로 구성 될 수 있다.The first recording layer 123 may be configured as a phase change type recording layer or a magneto-optical recording layer for recording in a manner having either a crystalline state or an amorphous state according to the temperature and cooling rate of the incident light. Here, the phase change recording layer may be made of a GeSbTe-based material having a thickness of about 500 GPa or less. The magneto-optical recording layer may be made of a TbFeCo-based material having a thickness of about 500 GPa or less.

또한, 상기 제1기록층(123)은 재생층과 기록층으로 이루어진 2층 구조의 확대재생층(MAMMOS : Magnetic AMplifing Magneto-Optical System)으로 구성될 수도 있다.In addition, the first recording layer 123 may be composed of a two-layer enlarged reproduction layer (MAMMOS: Magnetic AMplifing Magneto-Optical System) consisting of a reproduction layer and a recording layer.

상기 제2기록막(150)은 제2상부유전체층(151), 제2기록층(153) 및 제2하부유전체층(155)으로 구성되며, 제3기록막(180)은 제3상부유전체층(181), 제3기록층(183) 및 제3하부유전체층(185)으로 구성된다. 여기서, 상기 제2 및 제3기록막(150)(180)을 구성하는 각 층의 구조 및 역할은 앞서 설명된 제1기록막(120) 과 같으므로 자세한 설명은 생략한다. The second recording film 150 includes a second upper dielectric layer 151, a second recording layer 153, and a second lower dielectric layer 155, and the third recording film 180 includes a third upper dielectric layer 181. ), A third recording layer 183 and a third lower dielectric layer 185. Here, since the structure and role of each layer constituting the second and third recording films 150 and 180 are the same as those of the first recording film 120 described above, a detailed description thereof will be omitted.

상기 제1 내지 제3마스킹층(130)(160)(190)은 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고, 소정 온도 이하에서는 입사광을 투과시키는 층이다. 상기 제1 내지 제3마스킹층(130)(160)(190)은 입사광에 의해 소정 온도 이상에서 마스킹 되면서 반사막으로 변화되는 재질인 실리콘(Si), 나트륨(Na), 칼슘(Ca), 코발트(Co), 산소(O)로 구성된 그룹으로부터 선택된 어느 하나를 포함한다.The first to third masking layers 130, 160 and 190 are selectively masked according to the temperature of incident light to change into a reflecting member at a predetermined temperature or more to reflect incident light, and to transmit incident light below a predetermined temperature. . The first to third masking layers 130, 160 and 190 are made of silicon (Si), sodium (Na), calcium (Ca), and cobalt (Ma), which are masked at a predetermined temperature or more by incident light and changed into a reflective film. Co), oxygen (O), any one selected from the group consisting of.

상기 제1마스킹층(130)은 대물렌즈(31)의 포커싱에 의해 상기 제1기록막(120)에 광스폿이 형성되는 경우, 제1마스킹층(130)이 마스킹 가능한 소정 온도를 유지하여, 반사영역으로 변화된다. 한편, 상기 제1마스킹층(130)은 상기 제2 및 제3기록막(150)(180)에 광스폿이 맺히는 경우에는 광이 진행되는 경로 상에 위치된 제1마스킹층(130)의 영역이 기록온도 이하의 온도를 유지하여, 입사광을 투과시킨다. 도면은 광스폿(SPOT)이 제3기록막(180)에 맺힌 경우 제3마스킹층(190)에 반사영역(191)이 형성된 예와, 광스폿이 제2기록막(150)에 맺힌 경우 제2마스킹층(160)에 광스폿이 맺힌 예를 보인 것이다. 여기서, 상기 제3마스킹층(190)은 입사광을 전반사시킬 수 있도록 된 반사층으로 대체되어도 무방하다.When the light mask is formed on the first recording layer 120 by focusing the objective lens 31, the first masking layer 130 maintains a predetermined temperature at which the first masking layer 130 can be masked. The reflection area is changed. Meanwhile, when light spots form on the second and third recording layers 150 and 180, the first masking layer 130 is an area of the first masking layer 130 positioned on a path through which light travels. The temperature below this recording temperature is maintained to transmit incident light. In the drawing, when the light spot is formed on the third recording film 180, the reflective region 191 is formed on the third masking layer 190, and when the light spot is formed on the second recording film 150. 2 shows an example in which light spots are formed on the masking layer 160. In this case, the third masking layer 190 may be replaced with a reflective layer capable of total reflection of the incident light.

상기 제1 내지 제3마스킹층(130)(160)(190) 각각에는 입사된 광이 몇 층 기록막에 맺히는지를 구분할 수 있는 서보 마크(135)(165)(195)가 형성되어 있다. Each of the first to third masking layers 130, 160, and 190 is provided with servo marks 135, 165, and 195 for distinguishing which layer the incident light forms on the recording film.

상기 제1스페이서층(140)은 상기 제1마스킹층(130)과 상기 제2기록막(150) 사이에 위치되어 제1기록막(120)과 제2기록막(150) 사이의 간격이 2 내지 50㎛ 유지되도록 하는 층이다. 이 제1스페이서층(140)은 입사광을 투과시키는 층으로, 포토레지스트 등으로 구성된다. 상기 제2스페이서층(170)은 상기 제2마스킹층(160)과 상기 제3기록막(180) 사이에 위치되어 제2기록막(150)과 제3기록막(180) 사이의 간격이 2 내지 50㎛를 유지할 수 있도록 하는 층으로, 포토레지스트 등으로 구성된다. The first spacer layer 140 is positioned between the first masking layer 130 and the second recording film 150 so that a gap between the first recording film 120 and the second recording film 150 is two. To 50 탆. The first spacer layer 140 is a layer that transmits incident light and is made of a photoresist or the like. The second spacer layer 170 is positioned between the second masking layer 160 and the third recording layer 180 so that a gap between the second recording layer 150 and the third recording layer 180 is two. It is a layer which can hold to 50 micrometers, Comprising: It consists of photoresists etc.

여기서, 상기 광디스크는 도시된 바와 같은 3층 구조 이외에, 2층 또는 4층 이상의 다층 구조로도 제작될 수 있음은 물론이다.Here, of course, the optical disk may be manufactured in a multi-layered structure having two or more layers in addition to the three-layered structure as shown.

도 3은 본 발명의 다른 실시예에 따른 3층 구조를 갖는 광 디스크를 보인 개략적인 단면도이다. 이 광디스크는 고체함침미러(SIM; Solid Immersion Mirro)(41)등의 광디스크에 근접되게 위치된 광학요소를 채용한 니어필드(near field) 광학계에 적합한 구조를 갖는다. 3 is a schematic cross-sectional view showing an optical disk having a three-layer structure according to another embodiment of the present invention. This optical disc has a structure suitable for near field optical systems employing optical elements located in proximity to the optical disc, such as a solid immersion mirror (SIM) 41.

즉, 이 광디스크는 기판(290)과, 이 기판(290) 상에 적층 형성되는 것으로 집속된 광에 의해 정보신호의 기록과 재생이 이루어지는 제1 내지 제3기록막(210)(240)(270)과, 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고 소정 온도 이하에서는 입사광을 투과시키는 제1 내지 제3마스킹층(220)(250)(280)와, 상기 제1 내지 제3기록막들(210)(240)(270) 사이 간격을 유지하는 제1 및 제2스페이서층(230)(260)을 포함한다. 이와 같은 구성을 갖는 광디스크의 각 층은 상기 SIM(41)에서 집속되어 입사되는 입사광 쪽으로부터 순차로, 제1기록막(210), 제1마스킹(masking)층(220), 제1스페이서층(230), 제2기록막(240), 제2마스킹층(250), 제2스페이서(260), 제3기록막(270), 제3마스킹층(280) 및 기판(290)이 위치되도록 배치된다.That is, the optical disk is formed by stacking on the substrate 290 and the first and third recording films 210, 240 and 270 in which information signals are recorded and reproduced by the focused light. And first to third masking layers 220, 250 and 280 that are selectively masked according to the temperature of the incident light to change into a reflecting member at a predetermined temperature or more to reflect the incident light and to transmit the incident light below a predetermined temperature; And first and second spacer layers 230 and 260 which maintain a gap between the first to third recording films 210, 240 and 270. Each layer of the optical disk having such a configuration is sequentially formed from the incident light incident on the SIM 41 and incident on the first recording film 210, the first masking layer 220, and the first spacer layer ( 230, the second recording film 240, the second masking layer 250, the second spacer 260, the third recording film 270, the third masking layer 280, and the substrate 290 are disposed to be positioned. do.

상기 제1기록막(210)은 상기 대물렌즈(31)이 포커싱에 의해 광이 집속되는 경우, 정보신호의 기록과 재생이 이루어지는 부분으로, 상기 SIM(41) 쪽으로부터 순차로 소정 굴절률을 갖는 제1상부유전체층(211), 제1기록층(213), 소정 굴절률을 갖는 제1하부유전체층(215)으로 구성된다. 이 제1기록막(210)은 도 2를 참조하여, 설명된 일 실시예에 따른 제1기록막(도 2의 120)과 실질적으로 동일한 구성 및 기능을 가지므로 그 자세한 설명을 생략한다.The first recording film 210 is a part where recording and reproduction of an information signal are performed when the objective lens 31 focuses light by focusing. The first recording film 210 has a predetermined refractive index sequentially from the SIM 41. The first upper dielectric layer 211, the first recording layer 213, and the first lower dielectric layer 215 having a predetermined refractive index are formed. Since the first recording film 210 has substantially the same configuration and function as the first recording film 120 of FIG. 2 according to the embodiment described with reference to FIG. 2, a detailed description thereof will be omitted.

상기 제2기록막(240)은 제2상부유전체층(241), 제2기록층(243) 및 제2하부유전체층(245)으로 구성되며, 제3기록막(270)은 제3상부유전체층(271), 제3기록층(273) 및 제3하부유전체층(275)으로 구성된다. 여기서, 상기 제2 및 제3기록막(240)(270)을 구성하는 각 층의 구조 및 역할은 앞서 설명된 제1기록막(210)과 같으므로 자세한 설명은 생략한다. The second recording film 240 includes a second upper dielectric layer 241, a second recording layer 243, and a second lower dielectric layer 245, and the third recording film 270 includes a third upper dielectric layer 271. ), A third recording layer 273 and a third lower dielectric layer 275. Here, since the structure and role of each layer constituting the second and third recording films 240 and 270 are the same as those of the first recording film 210 described above, a detailed description thereof will be omitted.

상기 제1 내지 제3마스킹층(220)(250)(280)은 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고, 소정 온도 이하에서는 입사광을 투과시키는 층이다. 상기 제1 내지 제3마스킹층(220)(250)(280)은 입사광에 의해 소정 온도 이상에서 마스킹 되면서 반사막으로 변화되는 재질인 실리콘(Si), 나트륨(Na), 칼슘(Ca), 코발트(Co), 산소(O)로 구성된 그룹으로부터 선택된 어느 하나를 포함한다.The first to third masking layers 220, 250, and 280 are selectively masked according to the temperature of incident light to change into a reflecting member at a predetermined temperature or higher to reflect incident light, and to transmit incident light below a predetermined temperature. . The first to third masking layers 220, 250, and 280 are made of silicon (Si), sodium (Na), calcium (Ca), and cobalt (Ma), which are masked at a predetermined temperature or more by incident light and changed into a reflective film. Co), oxygen (O), any one selected from the group consisting of.

상기 제1마스킹층(220)은 SIM(41)의 포커싱에 의해 상기 제1기록막(210)에 광스폿이 형성되는 경우, 제1마스킹층(220)이 마스킹 가능한 소정 온도를 유지하여, 반사영역으로 변화된다. 한편, 상기 제1마스킹층(220)은 상기 제2 및 제3기록막(240)(270)에 광스폿이 맺히는 경우에는 광이 진행되는 경로 상에 위치된 제1마스킹층(220)의 영역이 기록온도 이하의 온도를 유지하여, 입사광을 투과시킨다. 도면은 광스폿(SPOT)이 제2기록막(240)에 맺힌 경우 제2마스킹층(255)에 반사영역(251)이 형성된 예를 보인 것이다.When the light mask is formed on the first recording layer 210 by the focusing of the SIM 41, the first masking layer 220 maintains a predetermined temperature at which the first masking layer 220 can be masked to reflect the light spot. Changed to the area. On the other hand, the first masking layer 220 is an area of the first masking layer 220 positioned on a path through which light travels when light spots are formed on the second and third recording layers 240 and 270. The temperature below this recording temperature is maintained to transmit incident light. The drawing shows an example in which the reflective region 251 is formed in the second masking layer 255 when the light spot SPOT is formed on the second recording film 240.

여기서, 상기 제3기록막(270)과 기판(290) 사이에 놓인 제3마스킹층(280)은 입사광을 전반사시킬 수 있도록 된 반사층으로 대체되어도 무방하다.Here, the third masking layer 280 disposed between the third recording film 270 and the substrate 290 may be replaced with a reflective layer capable of totally reflecting incident light.

상기 제1 내지 제3마스킹층(220)(250)(280) 각각에는 입사된 광이 몇 층 기록막에 맺히는지를 구분할 수 있는 서보 마크(225)(255)(285)가 형성되어 있다.In each of the first to third masking layers 220, 250, and 280, servo marks 225, 255, and 285 are formed to distinguish which layer the incident light forms on the recording film.

상기 제1 및 제2스페이서층(230)(260)의 구성 및 기능은 앞서 설명된 일 실시예에 따른 제1 및 제2스페이서층(도 2의 140)(도 2의 170)과 실질적으로 동일하므로 그 자세한 설명은 생략한다. 여기서, 상기 광디스크는 도시된 바와 같은 3층 구조 이외에, 2층 또는 4층 이상의 다층 구조로도 제작될 수 있음은 물론이다.The configuration and function of the first and second spacer layers 230 and 260 are substantially the same as the first and second spacer layers 140 (FIG. 2) (170 of FIG. 2) according to the above-described embodiment. Therefore, detailed description thereof will be omitted. Here, of course, the optical disk may be manufactured in a multi-layered structure having two or more layers in addition to the three-layered structure as shown.

이와 같이, 기록막들 사이에 온도에 따라 입사광의 투과 및 반사를 결정하는 마스킹층을 구비함으로써, 입사광으로부터 먼 쪽에 위치하는 기록층에 전달되는 광 효율을 개선할 수 있어서, 사용 광원의 광 파워 증대없이도 소망하는 광효율을 얻을 수 있다.As such, by providing a masking layer for determining the transmission and reflection of incident light in accordance with the temperature between the recording films, it is possible to improve the light efficiency transmitted to the recording layer located away from the incident light, thereby increasing the optical power of the light source used. Without this, the desired light efficiency can be obtained.

Claims (5)

입사광이 투과되는 투명기판과;A transparent substrate through which incident light is transmitted; 상기 투명기판에 적층 형성되며, 집속된 광에 의해 정보신호의 기록과 재생이 이루어지는 복수의 기록막과;A plurality of recording films stacked on the transparent substrate and configured to record and reproduce information signals by focused light; 상기 기록막들 사이에 배치되며, 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고, 소정 온도 이하에서는 입사광을 투과시키는 적어도 하나의 마스킹층과;At least one masking layer disposed between the recording films and selectively masked according to a temperature of incident light to change into a reflecting member at a predetermined temperature or more to reflect incident light, and to transmit incident light below a predetermined temperature; 상기 마스킹층을 투과한 광이 투과되며, 상기 복수의 기록막들 사이 간격을 유지하는 스페이서층;을 포함하는 것을 특징으로 하는 광디스크.And a spacer layer through which the light passing through the masking layer is transmitted and maintaining a gap between the plurality of recording films. 기판과,Substrate, 상기 기판에 적층 형성되며, 집속된 광에 의해 정보신호의 기록과 재생이 이루어지는 복수의 기록막과;A plurality of recording films stacked on the substrate and configured to record and reproduce information signals by focused light; 상기 기록막들 사이 및 상기 기록막과 상기 기판 사이에 배치되며, 입사광의 온도에 따라 선택적으로 마스킹되어 소정 온도 이상에서 반사부재로 변하여 입사광을 반사시키고, 소정 온도 이하에서는 입사광을 투과시키는 적어도 하나의 마스킹층과;At least one disposed between the recording films and between the recording film and the substrate and selectively masked according to the temperature of incident light to change into a reflecting member at a predetermined temperature or more to reflect incident light, and to transmit incident light below a predetermined temperature A masking layer; 상기 마스킹층을 투과한 광이 투과되며, 상기 복수의 기록막들 사이 간격을 유지하는 스페이서층;을 포함하는 것을 특징으로 하는 광디스크.And a spacer layer through which the light passing through the masking layer is transmitted and maintaining a gap between the plurality of recording films. 제1항 또는 제2항에 있어서, 상기 마스킹층은,The method of claim 1 or 2, wherein the masking layer, 입사광에 의해 소정 온도 이상에서 마스킹 되면서 반사막으로 변화되는 재질인 실리콘(Si), 나트륨(Na), 칼슘(Ca), 코발트(Co), 산소(O)로 구성된 그룹으로부터 선택된 어느 하나를 포함하여 된 것을 특징으로 하는 광디스크.It includes any one selected from the group consisting of silicon (Si), sodium (Na), calcium (Ca), cobalt (Co), oxygen (O), which is a material that is masked at a predetermined temperature or more by incident light and changed into a reflective film. An optical disc, characterized in that. 제1항 또는 제2항에 있어서, 상기 복수의 마스킹 층 각각에는,The method of claim 1 or 2, wherein each of the plurality of masking layers, 입사된 광이 맺히는 기록막을 구분할 수 있도록 된 서보 마크가 형성된 것을 특징으로 하는 광디스크.And a servo mark formed to distinguish a recording film on which incident light is formed. 제1항 또는 제2항에 있어서, 상기 복수의 기록막 각각은,The recording medium according to claim 1 or 2, wherein each of the plurality of recording films, 소정 굴절률을 가지며, 입사되는 광을 투과시키는 한 쌍의 유전체층과, 이 유전체층 사이에 위치되며, 정보신호가 기록되는 기록층을 포함하는 것을 특징으로 하는 광디스크.And a pair of dielectric layers having a predetermined refractive index and transmitting incident light, and a recording layer located between the dielectric layers and on which an information signal is recorded.
KR1019990050217A 1999-11-12 1999-11-12 Optical disk KR100636113B1 (en)

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