KR19990011140A - Optical disc - Google Patents
Optical disc Download PDFInfo
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- KR19990011140A KR19990011140A KR1019970034111A KR19970034111A KR19990011140A KR 19990011140 A KR19990011140 A KR 19990011140A KR 1019970034111 A KR1019970034111 A KR 1019970034111A KR 19970034111 A KR19970034111 A KR 19970034111A KR 19990011140 A KR19990011140 A KR 19990011140A
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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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/0079—Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas
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- 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
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
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- 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
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
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- G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
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- 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
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- G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
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- G11B2007/25715—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing oxygen
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- G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
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- G11B2007/25718—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing halides (F, Cl, Br, l)
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- G11B7/253—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 substrates
- G11B7/2533—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 substrates comprising resins
- G11B7/2534—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 substrates comprising resins polycarbonates [PC]
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Abstract
포맷이 다른 디스크 플레이어에 호환 채용될 수 있는 광디스크가 개시되어 있다.Disclosed are an optical disc that can be compatible with other disc players in different formats.
이 개시된 광디스크는 입사광쪽으로부터 순차로, 입사광이 투과되는 투명기판과; 정보신호가 기록되는 정보 기록면을 가지며, 기록된 정보가 제1파장의 광에 의해 재생되는 제1기록층과; 입사광을 파장영역에 따라 광의 투과율을 달리하도록 하여 제1파장의 광은 대부분은 반사시키고, 제2파장의 광은 대부분 투과시키도록 된 반투막과; 반투막을 투과한 광이 투과되며 간격을 유지하는 스페이서와; 정보신호가 기록되는 정보 기록면을 가지며, 기록된 정보가 반투막을 투과한 제2파장의 광에 의해 재생되는 제2기록층과; 스페이서와 제2기록층 사이에 형성되어, 상기 제2기록층의 정보 기록면에 맺힌 광을 반사시키는 반사막과; 제2기록층을 보호하도록 된 보호층;을 포함하여 된 것을 특징으로 한다.The disclosed optical disc comprises: a transparent substrate on which incident light is transmitted sequentially from the incident light side; A first recording layer having an information recording surface on which an information signal is recorded, the recorded information being reproduced by light of a first wavelength; A semi-permeable membrane adapted to reflect incident light to a wavelength region so that most light of the first wavelength is reflected and most light of the second wavelength is transmitted; A spacer for transmitting the light passing through the semi-permeable membrane and maintaining a gap therebetween; A second recording layer having an information recording surface on which an information signal is recorded, the recorded information being reproduced by light of a second wavelength passing through the semi-permeable membrane; A reflection film formed between the spacer and the second recording layer to reflect light formed on the information recording surface of the second recording layer; And a protective layer adapted to protect the second recording layer.
Description
본 발명은 이층 또는 그 이상의 정보 기록층을 갖는 광디스크에 관한 것으로서, 상세하게는 서로 다른 포맷을 갖는 디스크 플레이어에 호환 채용될 수 있도록 된 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 that can be compatible with disc players having different formats.
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 정보 기록 밀도를 고용량화 할 수 있는 이점은 있으나, 어느 한 종류의 디스크 플레이어 예컨대, 650nm 파장의 광을 사용하는 디지털 다기능 디스크롬(DVD-ROM)에 채용된다.As described above, the structured optical disk includes two recording layers 13 and 19, which has the advantage of increasing the capacity of information recording. However, any type of disk player, for example, digital light using a wavelength of 650 nm, can be used. It is adopted in multifunctional disk ROM (DVD-ROM).
한편, 최근 들어 디스크 플레이어 기술분야에 있어서, 고음질, 고화질 및 고용량화가 가능한 새로운 규격인 디지털 다기능 디스크 플레이어(DVDP)가 등장하고 있다. 이 DVDP는 CDP와는 달리 광원으로 650nm 파장의 광을 출사하는 레이저를 채용하고, 개구수 0.6의 대물렌즈로 표준화되었다. 또한, DVDP 전용의 광디스크(DVD)의 규격에 있어서, 일반 CD가 입사면과 정보면 사이의 두께가 1.2mm이고 트랙 피치가 1.6㎛인 반면, 두께 0.6mm이고 트랙 피치가 0.74㎛로 표준화되었다.On the other hand, in the field of the disc player technology, a digital standard multi-function disc player (DVDP), which is a new standard capable of high sound quality, high quality, and high capacity, has recently emerged. Unlike CDP, this DVDP uses a laser that emits light of 650 nm wavelength as a light source and is standardized to an objective lens with a numerical aperture of 0.6. In addition, in the standard of an optical disc (DVD) dedicated for DVDP, a normal CD has a thickness of 1.2 mm and a track pitch of 1.6 mu m, while the thickness is 0.6 mm and a track pitch of 0.74 mu m is standardized.
상기한 DVDP는 널리 보급된 CDP용 광디스크(CD)를 호환 채용할 수 있도록 다양한 형태로 개발되고 있어서, CD에 기록된 정보의 재생은 CDP 뿐만 아니라 DVDP로도 재생가능하다.The above-mentioned DVDPs are developed in various forms so as to be compatible with widely used optical discs (CDs) for CDP, so that the information recorded on the CD can be reproduced not only with the CDP but also with the DVDP.
하지만, DVD는 그 규격이 CD와 상이하므로 기록된 정보를 상기한 CDP를 이용하여 재생할 수 없다는 문제점이 있다.However, since DVDs have different standards from CDs, there is a problem in that recorded information cannot be reproduced using the CDP.
따라서, 본 발명은 상기한 바와 같은 점을 감안하여 안출된 것으로서, 서로 다른 포맷을 갖는 디스크 플레이어에 호환 채용될 수 있도록 된 이층 또는 그 이상의 기록층을 갖는 광디스크를 제공하는데 그 목적이 있다.Accordingly, an object of the present invention is to provide an optical disc having two or more recording layers which can be interchangeably employed in disc players having different formats.
도 1은 종래의 일에 따른 이층 구조를 갖는 광디스크를 보인 단면도.1 is a cross-sectional view showing an optical disk having a two-layer structure according to the prior art.
도 2는 본 발명의 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 발명에 따른 광디스크의 반투막의 파장에 따른 반사율 특성을 나타낸 그래프.Figure 3 is a graph showing the reflectance characteristics according to the wavelength of the semi-permeable membrane of the optical disk according to the present invention.
도 4는 본 발명에 따른 광디스크의 반투막의 일 실시예를 보인 단면도.Figure 4 is a cross-sectional view showing an embodiment of a semipermeable membrane of the optical disk according to the present invention.
도 5는 본 발명에 따른 광디스크의 반투막의 다른 실시예를 보인 단면도.5 is a cross-sectional view showing another embodiment of the semipermeable membrane of the optical disk according to the present invention.
도 6은 도 5의 제1층 유전체층의 두께 변화에 따른 제1 및 제2파장 각각의 반사율을 보인 그래프.FIG. 6 is a graph showing reflectance of each of the first and second wavelengths according to the thickness variation of the first layer dielectric layer of FIG. 5; FIG.
도 7은 본 발명에 따른 광디스크의 제1기록층을 이용하는 예를 보인 개략도.Fig. 7 is a schematic diagram showing an example of using a first recording layer of an optical disc according to the present invention.
도 8은 본 발명에 따른 광디스크의 제2기록층을 이용하는 예를 보인 개략도.Fig. 8 is a schematic diagram showing an example of using a second recording layer of the optical disc according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
31...투명기판 33...제1기록층 35...반투막31 Transparent substrate 33 First recording layer 35 Semi-permeable membrane
37,41...접합층 39...스페이서 43...반사막37,41 ... bonded layer 39 ... spacer 43 ... reflective film
45...제2기록층 47...보호층45 second recording layer 47 protective layer
상기한 목적을 달성하기 위하여 본 발명은, 입사광이 투과되는 투명기판과; 정보신호가 기록되는 정보 기록면을 가지며, 기록된 정보가 제1파장의 광에 의해 재생되는 제1기록층과; 상기 제1기록층의 일면에 형성되며, 입사광을 파장영역에 따라 광의 투과율을 달리하도록 하여 제1파장의 광은 대부분은 반사시키고, 제2파장의 광은 대부분 투과시키도록 된 반투막과; 상기 반투막을 투과한 광이 투과되며 간격을 유지하는 스페이서와; 정보신호가 기록되는 정보 기록면을 가지며, 기록된 정보가 상기 반투막을 투과한 제2파장의 광에 의해 재생되는 제2기록층과; 상기 제2기록층의 정보기록면에 형성되어, 상기 제2기록층에 맺힌 광을 반사시키는 반사막과; 상기 제2기록층을 보호하도록 된 보호층;을 포함하여 서로 다른 포맷을 갖는 광디스크 플레이어에 호환 채용될 수 있도록 된 것을 특징으로 한다.In order to achieve the above object, the present invention is a transparent substrate through which incident light is transmitted; A first recording layer having an information recording surface on which an information signal is recorded, the recorded information being reproduced by light of a first wavelength; A semi-permeable membrane formed on one surface of the first recording layer, the incident light having different transmittances depending on the wavelength region, so that most of the light of the first wavelength is reflected and most of the light of the second wavelength is transmitted; A spacer which transmits the light transmitted through the semi-permeable membrane and maintains a gap therebetween; A second recording layer having an information recording surface on which an information signal is recorded, the recorded information being reproduced by light of a second wavelength passing through the semi-permeable membrane; A reflecting film formed on the information recording surface of the second recording layer, for reflecting light formed on the second recording layer; And a protective layer adapted to protect the second recording layer, so as to be compatible with optical disc players having different formats.
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 실시예에 따른 광 디스크를 보인 개략적인 단면도이다. 도시된 바와 같이, 광디스크는 광(L)이 조사되는 쪽으로부터 순차로, 투명기판(31), 제1기록층(33), 반투막(35), 스페이서(39), 반사막(43), 제2기록층(45) 및 보호층으로 구성된다.2 is a schematic cross-sectional view showing an optical disk according to an embodiment of the present invention. As shown in the figure, the optical disk is sequentially provided from the side from which the light L is irradiated, the transparent substrate 31, the first recording layer 33, the semi-permeable membrane 35, the spacer 39, the reflective film 43, and the second. It consists of a recording layer 45 and a protective layer.
상기 투명기판(31)은 입사광(L)이 투과되는 층으로 항기 제1기록층(33)을 보호한다. 상기 투명기판(31)은 통상의 광디스크와 마찬가지로 투명한 PVC등으로 제작된다. 상기 제1기록층(33)은 정보가 기록되는 정보 기록면(34)을 가지며, 이 정보 기록면(34)에 기록된 정보는 입사되는 제1파장의 광에 의해 재생된다. 상기 제1파장은 대략 650㎚의 파장을 말하며, 상기 제1기록층(33)은 통상의 디지털 다기능 디스크의 정보 기록층에 해당한다. 제1기록층(33)의 정보 기록면(34)에는 트랙을 이루도록 된 나선형의 랜드(34a)와, 피트(pit)(34b)가 형성되어 있다. 여기서, 상기 제1기록층(33)의 트랙피치는 대략 0.74㎛이고, 상기 투명기판(31)의 광 입사면(31a)과 상기 제1기록층(33)의 정보 기록면(34) 사이의 간격()은 대략 0.6mm인 것이 바람직하다.The transparent substrate 31 protects the first recording layer 33 as a layer through which incident light L is transmitted. The transparent substrate 31 is made of transparent PVC or the like like a conventional optical disk. The first recording layer 33 has an information recording surface 34 on which information is recorded, and the information recorded on this information recording surface 34 is reproduced by the light of the incident first wavelength. The first wavelength refers to a wavelength of approximately 650 nm, and the first recording layer 33 corresponds to an information recording layer of a conventional digital multifunction disk. On the information recording surface 34 of the first recording layer 33, spiral lands 34a and pit 34b which form tracks are formed. Here, the track pitch of the first recording layer 33 is approximately 0.74 占 퐉, and the distance between the light incident surface 31a of the transparent substrate 31 and the information recording surface 34 of the first recording layer 33. ( ) Is preferably about 0.6 mm.
상기 반투막(35)은 상기 제1기록층(33)의 정보 기록면(34) 상에 형성되며, 입사광을 파장영역에 따라 광의 투과율을 달리하도록 하여 제1파장의 광은 대부분은 반사시키고, 상기 제2기록층(45)에 기록된 정보신호를 재생하는데 이용되는 제2파장 예컨대, 파장이 780㎚인 광은 대부분 투과시킨다.The semi-permeable membrane 35 is formed on the information recording surface 34 of the first recording layer 33, and reflects the incident light to vary the transmittance of the light according to the wavelength region so that most of the light of the first wavelength is reflected. The second wavelength used for reproducing the information signal recorded on the second recording layer 45, for example, most of the light having a wavelength of 780 nm is transmitted.
상기 스페이서(39)는 상기 제1기록층(33)과 제2기록층(45)의 간격을 유지시킴과 아울러 두 기록층(33)(45)을 접합하기 위한 층으로 상기 반투막(35)을 투과하여 입사된 제2파장의 광을 투과시킨다.The spacer 39 maintains a gap between the first recording layer 33 and the second recording layer 45, and connects the semi-permeable membrane 35 as a layer for bonding the two recording layers 33 and 45. It transmits and transmits the light of the incident second wavelength.
여기서, 상기 반투막(35)과 상기 스페이서(39) 사이 및 상기 스페이서(39)와 상기 제2기록층(45) 사이 각각에는 접합층(37)(41)이 형성된다. 이 접합층(37)(41)은 자외선을 조사함에 의해 경화될 수 있는 경화 수지로 이루어지며, 널리 알려진 스핀코팅법등에 의해 접합된다.A bonding layer 37, 41 is formed between each of the semi-permeable membrane 35 and the spacer 39 and between the spacer 39 and the second recording layer 45. The bonding layers 37 and 41 are made of a curable resin that can be cured by irradiating ultraviolet rays, and are bonded by a well-known spin coating method or the like.
상기 제2기록층(45)은 정보신호가 기록되는 정보 기록면(46)을 가지며, 기록된 정보가 상기 반투막(35)을 투과한 제2파장의 광에 의해 재생된다. 상기 제2기록층(45)은 통상의 컴팩트 디스크(CD)의 정보 기록층에 해당한다. 제2기록층(45)은 제1기록층(33)과 마찬가지로 트랙을 이루도록 된 나선형의 랜드(46a)와, 피트(46b)가 형성되어 있다. 여기서, 상기 제2기록층(45)의 트랙피치는 대략 1.6㎛이고, 상기 투명기판(31)의 광 입사면(31a)과 상기 제2기록층(45)의 정보 기록면(46) 사이의 간격()은 대략 1.2mm 인 것이 바람직하다.The second recording layer 45 has an information recording surface 46 on which an information signal is recorded, and the recorded information is reproduced by the light of the second wavelength passing through the semi-permeable membrane 35. The second recording layer 45 corresponds to the information recording layer of a conventional compact disc (CD). Similar to the first recording layer 33, the second recording layer 45 is formed with a spiral land 46a and a pit 46b which are formed in a track. Here, the track pitch of the second recording layer 45 is approximately 1.6 占 퐉, and the distance between the light incident surface 31a of the transparent substrate 31 and the information recording surface 46 of the second recording layer 45. ( ) Is preferably about 1.2 mm.
상기 제1기록층(33)과 제2기록층(45)에 기록된 정보에 있어서, 실질적으로 동일한 정보가 수록될 수 있다. 예컨대, 본 발명의 광디스크를 오디오용 호환 디스크로 사용하는 경우 제1 및 제2기록층(33)(45) 각각에 동일한 종류의 오디오 정보를 다른 형태로 기록한다. 즉, 제1기록층(33)에는 96KHz 이상의 샘플링 주파수와 돌비 AC3의 5.1 채널을 갖는 수퍼 오디오 정보를 기록하고, 상기 제2기록층(45)에는 44.1KHz 샘플링 주파수의 스테레오 음향 정보를 기록할 수 있다. 따라서, CDP에서는 스테레오로 동작하고, DVDP에서는 슈퍼 오디오로 동작한다.In the information recorded in the first recording layer 33 and the second recording layer 45, substantially the same information can be stored. For example, when the optical disc of the present invention is used as an audio compatible disc, the same kind of audio information is recorded in different forms in each of the first and second recording layers 33 and 45. That is, super audio information having a sampling frequency of 96 KHz or higher and 5.1 channels of Dolby AC3 is recorded in the first recording layer 33, and stereo sound information having a 44.1 KHz sampling frequency can be recorded in the second recording layer 45. have. Therefore, it operates in stereo in CDP and super audio in DVDP.
상기 반사막(43)은 상기 접착층(41)과 상기 제2기록층(45)의 정보 기록면(46) 사이에 형성되어, 상기 제2기록층(45)에 맺힌 광을 반사시킨다. 상기 반사막(43)은 알루미늄, 알루미늄 합금, 구리, 구리 합금등으로 형성된다.The reflective film 43 is formed between the adhesive layer 41 and the information recording surface 46 of the second recording layer 45 to reflect the light formed on the second recording layer 45. The reflective film 43 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.
상기 보호층(47)은 상기 제2기록층(45)을 보호하기 위한 층으로 상기 제2기록층(45) 상에 형성되어 상기 기록층의 산화 및 손상을 방지한다.The protective layer 47 is a layer for protecting the second recording layer 45 and is formed on the second recording layer 45 to prevent oxidation and damage of the recording layer.
본원 발명은 상기한 반투막(35)의 구조 및 특성에 특징이 있는 것으로 상기 반투막(35)을 도 3 내지 도 6을 참고로 설명한다.The present invention is characterized by the structure and characteristics of the semi-permeable membrane 35 described above with reference to the semi-permeable membrane 35 with reference to FIGS.
상기 반투막(35)은 도 3에 도시된 바와 같이, 650㎚ 파장에 대해 대략 25% 이상의 반사율을 갖고, 780㎚ 파장에 대해 18% 이하의 반사율을 갖는 것이 바람직하다.As shown in FIG. 3, the semi-permeable membrane 35 preferably has a reflectivity of about 25% or more for the 650 nm wavelength and a reflectance of 18% or less for the 780 nm wavelength.
이는, 하나의 광원을 이용하여 CD/DVD 호환 플레이어를 이용하여 재생함에 있어서, 단파장 예컨대, 650㎚ 파장을 이용하여 CD를 재생함으로 본 발명의 광 디스크의 제2기록층(45)에 기록된 정보를 재생하기 어려운 상황이 발생되는 것을 방지하기 위함이다.This means that the information recorded on the second recording layer 45 of the optical disk of the present invention is reproduced by reproducing a CD using a short wavelength, for example, a wavelength of 650 nm, in reproduction using a CD / DVD compatible player using one light source. This is to prevent the occurrence of a situation that is difficult to play.
상기한 바와 같은 반투막 특성을 얻기 위하여 상기 반투막은 후술하는 바와 같은 유전체 물질로 구성된다.In order to obtain the semi-permeable membrane properties as described above, the semi-permeable membrane is composed of a dielectric material as described later.
즉, 상기 반투막(35)은 실리콘, 실리콘 질화물,, 이산화티타늄, 이산화규소등의 유전체물질로 구성될 수 있다.That is, the semi-permeable membrane 35 is silicon Silicon nitride , Titanium dioxide , Silicon dioxide It may be composed of a dielectric material such as.
여기서, 상기 반투막(35)의 두께를 조절함에 의하여 제1파장에 대한 반사율과, 제2파장에 대한 투과율을 결정할 수 있다.Here, by adjusting the thickness of the semi-permeable membrane 35, the reflectance with respect to the first wavelength and the transmittance with respect to the second wavelength can be determined.
또한, 상기 반투막(35)은 이산화티타늄층과, 불화마그네슘층과, 이산화티타늄층이 순차로 적층된 다층의 유전체 물질로 구성될 수 있다.In addition, the semi-permeable membrane 35 is titanium dioxide Layer and magnesium fluoride Layer and titanium dioxide The layers may be composed of multiple dielectric materials stacked sequentially.
또한, 상기 반투막(35)은 대략 2.0 내지 2.9 범위의 굴절률을 갖는 고굴절률 유전체층과, 대략 1.3 내지 2.0 범위의 굴절률을 갖는 저굴절률 유전체층을 포함하여 구성된 것이 바람직하다.In addition, the semi-permeable membrane 35 preferably includes a high refractive index dielectric layer having a refractive index in the range of about 2.0 to 2.9 and a low refractive index dielectric layer having a refractive index in the range of about 1.3 to 2.0.
이와 같이, 광이 입사되는 쪽으로부터, 고굴절률 유전체층과 저굴절률 유전체층을 적층한 경우 경계면에서의 반사율(R)은 수학식 1에 의해 결정된다.As described above, when the high refractive index dielectric layer and the low refractive index dielectric layer are laminated from the light incident side, the reflectance R at the interface is determined by the equation (1).
여기서,과각각은 고굴절률 유전체층과 저굴절률 유전체층의 굴절률이고, d는 고굴절률 유전체층의 두께이며, λ는 입사하는 광의 파장이다.here, and Each is the refractive index of the high refractive index dielectric layer and the low refractive index dielectric layer, d is the thickness of the high refractive index dielectric layer, and λ is the wavelength of incident light.
따라서, 도 4에 도시된 바와 같이, 상기 고굴절률 유전체층과 상기 저굴절률 유전체층은 교변 적층하여 반투막(35)의 파장에 따른 반사율을 결정할 수 있다. 여기서, 상기 고굴절률 유전체층과 저굴절률 유전체층 각각은 실리콘, 실리콘 질화물,, 이산화티타늄, 이산화규소등의 유전체물질로 구성될 수 있다.Therefore, as illustrated in FIG. 4, the high refractive index dielectric layer and the low refractive index dielectric layer may be alternately stacked to determine reflectance according to the wavelength of the semi-permeable membrane 35. Here, each of the high refractive index dielectric layer and the low refractive index dielectric layer is silicon Silicon nitride , Titanium dioxide , Silicon dioxide It may be composed of a dielectric material such as.
또한, 상기 반투막(35)은 도 5에 도시된 바와 같이, 상기 제1기록층(33) 쪽으로부터 순차로 적층 형성된 고굴절률 유전체층(35a)과, 저굴절률 유전체층(35b)과, 고굴절률 유전체층(35c)을 포함하여 구성 될 수 있다. 도시된 바와 같이, 각 유전체층이 실리콘 질화물로 구성되고, 고굴절률층(35a)(35c)은 굴절률 2.88이고, 저굴절률층(35b)은 굴절률 1.94로 구성한 경우의 제1파장 650㎚의 광과 제2파장 780㎚의 광에 대한 반사율 특성을 도 6에 나타내었다.In addition, as shown in FIG. 5, the semi-permeable membrane 35 is formed of a high refractive index dielectric layer 35a, a low refractive index dielectric layer 35b, and a high refractive index dielectric layer (sequentially stacked from the first recording layer 33 side). 35c). As shown, each dielectric layer comprises silicon nitride The high refractive index layers 35a and 35c each have a refractive index of 2.88, and the low refractive index layer 35b has reflectance characteristics with respect to light having a first wavelength of 650 nm and light having a second wavelength of 780 nm when the refractive index layer is composed of a refractive index of 1.94. Is shown in FIG. 6.
도 6은 두 번째 층(35b)의 두께가 900Å이고, 세 번째 층(35c)의 두께가 600Å인 경우, 첫 번째 층(35a)의 두께에 따른 제1파장과 제2파장에서의 반사율 변화를 보인 그래프이다. 도시된 바와 같이, 첫 번째 층(35a)의 두께가 약 1500Å 근처에서 제1파장 650㎚에 대한 반사율은 57%로 높고, 제2파장 780㎚에 대한 반사율은 16%로 낮아 제2파장에 대해 84%의 광량을 투과 시키는 파장 선택성을 보임을 알 수 있다. 따라서, 상기한 유전체층의 두께를 조절하거나, 굴절률을 조절함에 의해 제1 및 제2파장에 대해 선택적으로 광의 반사율을 조절할 수 있다.6 shows the change in reflectance at the first wavelength and the second wavelength according to the thickness of the first layer 35a when the thickness of the second layer 35b is 900 ms and the thickness of the third layer 35 c is 600 µs. This is the graph shown. As shown, the reflectance for the first wavelength 650 nm is as high as 57% and the reflectance for the second wavelength 780 nm is as low as 16% when the thickness of the first layer 35a is about 1500 Hz, for the second wavelength. It can be seen that the wavelength selectivity to transmit the amount of light 84%. Therefore, by adjusting the thickness of the dielectric layer or by adjusting the refractive index, it is possible to selectively adjust the reflectance of light with respect to the first and second wavelengths.
이하, CDP에 의한 정보 재생시와 DVDP에 의한 정보 재생시를 예로 들어 광디스크의 사용을 설명한다.Hereinafter, the use of the optical disc will be described taking as an example the information reproduction by the CDP and the information reproduction by the DVDP.
도 7을 참조하면, 본 발명의 광디스크를 DVDP에 장착한 경우, 광원에서 조사된 650㎚ 파장의 광(51)은 개구수 0.6의 대물렌즈(53)에 의해 집속되어 상기 제1기록층(33)에 초점이 맺히게 된다. 집속된 광(52)은 상기 반투막(35)에서 대부분 반사되어 상기 제2기록층(45) 쪽으로 향하지 않는다.Referring to FIG. 7, when the optical disk of the present invention is mounted on a DVDP, the light 51 of 650 nm wavelength irradiated from the light source is focused by the objective lens 53 having a numerical aperture of 0.6 and the first recording layer 33 ) Will be in focus. The focused light 52 is mostly reflected by the semi-permeable membrane 35 and does not face the second recording layer 45.
한편, 도 8을 참조하면 본 발명의 광디스크를 CDP에 장착한 경우, 광원에서 조사된 780㎚ 파장의 광(61)은 개구수 0.45의 대물렌즈(63)에 의해 집속된다. 이 집속된 광(62)은 상기 투명기판(31), 제1기록층(33), 반투막(35) 및 스페이서(39)를 투과하여 상기 제2기록층(45)에 집속된다.On the other hand, referring to Fig. 8, when the optical disk of the present invention is mounted on the CDP, the light 61 of 780 nm wavelength irradiated from the light source is focused by the objective lens 63 having a numerical aperture of 0.45. The focused light 62 passes through the transparent substrate 31, the first recording layer 33, the semi-permeable membrane 35, and the spacer 39 and is focused on the second recording layer 45.
따라서, 본 발명에 따른 광디스크는 제1기록층(33)과 제2기록층(45)에 정보를 기록하고 두 기록층 사이에 파장에 따라 선택적으로 투과율을 달리하는 반투막(35)을 형성함에 의하여 다른 포맷을 갖는 종류가 다른 디스크 플레이어 예컨대, CDP와 DVDP에 호환 채용될 수 있다.Therefore, the optical disc according to the present invention records the information in the first recording layer 33 and the second recording layer 45, and forms a semi-permeable membrane 35 which selectively varies transmittance depending on the wavelength between the two recording layers. Kinds of different formats can be adopted for different disc players, for example, CDP and DVDP.
Claims (9)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970034111A KR19990011140A (en) | 1997-07-21 | 1997-07-21 | Optical disc |
| CNB981069576A CN1146889C (en) | 1997-07-21 | 1998-04-21 | Optical disk |
| GB9809623A GB2327525A (en) | 1997-07-21 | 1998-05-07 | Optical disk |
| NL1009126A NL1009126A1 (en) | 1997-07-21 | 1998-05-11 | Optical disc. |
| JP10130781A JPH1139710A (en) | 1997-07-21 | 1998-05-13 | Optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970034111A KR19990011140A (en) | 1997-07-21 | 1997-07-21 | Optical disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR19990011140A true KR19990011140A (en) | 1999-02-18 |
Family
ID=19515218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019970034111A KR19990011140A (en) | 1997-07-21 | 1997-07-21 | Optical disc |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH1139710A (en) |
| KR (1) | KR19990011140A (en) |
| CN (1) | CN1146889C (en) |
| GB (1) | GB2327525A (en) |
| NL (1) | NL1009126A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010047949A (en) * | 1999-11-24 | 2001-06-15 | 윤종용 | Phase change optical disk |
| KR20020011866A (en) * | 2000-08-04 | 2002-02-09 | 가네오 이토 | Optical recording medium |
| KR20020074685A (en) * | 2001-03-21 | 2002-10-04 | 한국전자통신연구원 | Optical storage medium based on the luminescence from the crystalline semiconductor and optical storage/reading device and method by using photon absorption |
| KR20050079018A (en) * | 2004-02-03 | 2005-08-09 | 엘지전자 주식회사 | Optical disk structure |
| KR20060016471A (en) * | 2004-08-18 | 2006-02-22 | 엘지전자 주식회사 | Multi reproducing media |
| KR100687990B1 (en) * | 2001-05-25 | 2007-02-27 | 파이오니아 코포레이션 | Multi-layer information recording medium and information recording and reproducing apparatus |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020101816A1 (en) * | 1999-05-20 | 2002-08-01 | Michael F. Braitberg | Removable optical storage device and system |
| AU5566200A (en) | 1999-06-22 | 2001-01-09 | Matsushita Electric Industrial Co., Ltd. | Optical disk, optical disk device, and reproducing method for optical disk |
| CN1323387C (en) * | 1999-06-22 | 2007-06-27 | 松下电器产业株式会社 | Optical disk device and optical disk read-out method |
| US20060179448A1 (en) * | 2004-12-23 | 2006-08-10 | Smith Wayne M | Multilayer dual optical disk |
| JP4502402B2 (en) * | 2005-06-09 | 2010-07-14 | パイオニア株式会社 | Information recording medium |
| JP2007004856A (en) | 2005-06-22 | 2007-01-11 | Sony Corp | Information processing device and method, and computer program |
| JP4305776B2 (en) * | 2006-10-11 | 2009-07-29 | ソニー株式会社 | Optical disc apparatus and focus position control method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7803069A (en) * | 1978-03-22 | 1979-09-25 | Philips Nv | MULTI-LAYER INFORMATION DISK. |
| JPH0823941B2 (en) * | 1988-11-08 | 1996-03-06 | パイオニア株式会社 | Optical information recording carrier and manufacturing method thereof |
| JPH056571A (en) * | 1991-06-28 | 1993-01-14 | Pioneer Electron Corp | Optical type information storage medium |
| JP3008819B2 (en) * | 1995-05-31 | 2000-02-14 | 日本ビクター株式会社 | optical disk |
| US5965228A (en) * | 1995-09-01 | 1999-10-12 | Balzers Aktiengesellschaft | Information carrier, method for producing same |
| HU224503B1 (en) * | 1995-09-08 | 2005-10-28 | Koninklijke Philips Electronics N.V. | Optical multilayer information carrier |
| EP0800699A1 (en) * | 1995-10-13 | 1997-10-15 | Koninklijke Philips Electronics N.V. | Optical registration medium with dual information layer |
| FR2750528A1 (en) * | 1996-06-28 | 1998-01-02 | Thomson Multimedia Sa | OPTICAL DISC COMPATIBLE WITH TWO DIFFERENT READING SYSTEMS |
-
1997
- 1997-07-21 KR KR1019970034111A patent/KR19990011140A/en not_active Application Discontinuation
-
1998
- 1998-04-21 CN CNB981069576A patent/CN1146889C/en not_active Expired - Fee Related
- 1998-05-07 GB GB9809623A patent/GB2327525A/en not_active Withdrawn
- 1998-05-11 NL NL1009126A patent/NL1009126A1/en active Search and Examination
- 1998-05-13 JP JP10130781A patent/JPH1139710A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010047949A (en) * | 1999-11-24 | 2001-06-15 | 윤종용 | Phase change optical disk |
| KR20020011866A (en) * | 2000-08-04 | 2002-02-09 | 가네오 이토 | Optical recording medium |
| KR20020074685A (en) * | 2001-03-21 | 2002-10-04 | 한국전자통신연구원 | Optical storage medium based on the luminescence from the crystalline semiconductor and optical storage/reading device and method by using photon absorption |
| KR100687990B1 (en) * | 2001-05-25 | 2007-02-27 | 파이오니아 코포레이션 | Multi-layer information recording medium and information recording and reproducing apparatus |
| KR20050079018A (en) * | 2004-02-03 | 2005-08-09 | 엘지전자 주식회사 | Optical disk structure |
| KR20060016471A (en) * | 2004-08-18 | 2006-02-22 | 엘지전자 주식회사 | Multi reproducing media |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2327525A (en) | 1999-01-27 |
| GB9809623D0 (en) | 1998-07-01 |
| JPH1139710A (en) | 1999-02-12 |
| CN1146889C (en) | 2004-04-21 |
| NL1009126A1 (en) | 1999-01-25 |
| CN1206183A (en) | 1999-01-27 |
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