KR0171077B1 - A recording and reproducing optical pickup system for optical disk with plural recording layer in one side by generating successively different polarization beam - Google Patents
A recording and reproducing optical pickup system for optical disk with plural recording layer in one side by generating successively different polarization beam Download PDFInfo
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- KR0171077B1 KR0171077B1 KR1019940010434A KR19940010434A KR0171077B1 KR 0171077 B1 KR0171077 B1 KR 0171077B1 KR 1019940010434 A KR1019940010434 A KR 1019940010434A KR 19940010434 A KR19940010434 A KR 19940010434A KR 0171077 B1 KR0171077 B1 KR 0171077B1
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- optical disk
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1359—Single prisms
-
- 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
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
Abstract
본 발명은 광 픽업을 개시한다.The present invention discloses an optical pickup.
본 발명은, 각각 P편광과 S편광을 발생시키며 서로 직각 방향으로 배열 설치된 편광 레이저와, 상기 편광 레이저의 광 경로상에 위치되며 상기 편광 레이저로부터 주사된 P,S편광 중 어느 하나의 편광은 전반사시키고 다른 하나의 편광은 전투과 시키는 편광 프리즘과, 상기 편광 프리즘과 광 디스크 사이에 위치되며 상기 P,S편광을 광 디스크에 집속시키는 집속수단을 포함하여 된 것을 특징으로 하는 것으로서, P,S편광을 발생시키는 편광 레이저와, 이들 P,S편광을 각각 전반사, 전투과 시키는 편광 프리즘에 의해 한쪽면에 복수의 기록층을 가지는 광 디스크에 기록/재생을 행할 수 있다.According to the present invention, a polarization laser which generates P polarization and S polarization, respectively, and which is arranged in a direction perpendicular to each other, and the polarization of any one of the P and S polarizations which are located on the optical path of the polarization laser and scanned from the polarization laser are total reflection. And the other polarization includes a polarization prism for combating and focusing means positioned between the polarization prism and the optical disk and focusing the P and S polarization on the optical disk. Recording / reproducing can be performed on an optical disk having a plurality of recording layers on one side by a polarizing laser to be generated and a polarizing prism which causes these P and S polarizations to totally reflect and fight.
Description
제1도는 한쪽면에 2층이상의 복수개의 기록층을 가지는 광디스크를 도시한 일부발췌 단면도이고,1 is a partial sectional view showing an optical disk having two or more recording layers on one side thereof;
제2도는 종래 광 픽업 시스템의 개략도이고,2 is a schematic view of a conventional optical pickup system,
제3도는 본 발명에 따른 광 픽업 시스템의 개략도이다.3 is a schematic diagram of an optical pickup system according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 광 디스크 100,200 : 편광 레이저1: optical disc 100,200: polarized laser
110, 210 : 캡 120,220 : 레이저 다이오드110, 210: Cap 120, 220: Laser Diode
130,230 : 홀로그램 140,240 : 포토 다이오드130,230 hologram 140, photodiode
300 : 편광 프리즘 400 : 대물렌즈300: polarization prism 400: objective lens
본 발명은 광 픽업 시스템에 관한 것으로서, 더욱 상세하게는 적어도 2가지 이상의 편광을 발생시켜 한 몸체에 복수개의 기록층을 갖는 광 디스크를 기록/재생할 수 있는 광 픽업 시스템에 관한 것이다.The present invention relates to an optical pickup system, and more particularly, to an optical pickup system capable of recording / reproducing an optical disk having a plurality of recording layers in one body by generating at least two or more polarizations.
일반적으로 단면 디스크에 비해 양면 디스크는 고밀도의 기록/재생이 가능한 이점이 있는 반면, 이를 기록/재생하기 위한 광 픽업의 구성이 복잡해지고 광 픽업을 이송시키기 위한 별도의 장치가 필요로 하는 단점이 있다.In general, compared to single-sided disks, the double-sided disk has the advantage of enabling high-density recording / reproducing, while the configuration of the optical pickup for recording / reproducing it is complicated and a separate device for transporting the optical pickup is required. .
이와같은 문제점을 해결하기 위하여 본 출원인 제1도에 도시된 바와 같이 국내 특허출원 제 94-9500호로 선출원한 광 디스크(1)를 제안한 바 있다.In order to solve such a problem, as shown in FIG. 1 of the present applicant, the optical disc 1 previously filed in Korean Patent Application No. 94-9500 has been proposed.
이는, 서로 대면하는 내측면에 각각 대응되는 비트(2a,3a)와 트랙(2b,3b)가 형성된 상,하부 수지층(2,3)을 구비한다.It has upper and lower resin layers 2, 3, on which bits 2a and 3a and tracks 2b and 3b respectively correspond to inner surfaces facing each other.
상,하부 수지층(2,3) 사이에는 주사되는 서로 다른 레이저 파장(λl,λ2)중 어느 한가지의 레이저 파장(λl)은 전반사시키고 다른 레이저 파장(λ2)은 투과시키는 유전체 코팅층(4)이 개재된다. 즉, 어느 하나의 레이저 파장(λl)은 하부 수지층(3)을 통과하여 이 하부 수지층(3)과 유전체 코팅층(4)사이에서 반사되게 되고 다른 하나의 레이저 파장(λ2)은 투과하여 상부 수지층을 향해 주사되게 된다.Between the upper and lower resin layers 2 and 3, a dielectric coating layer 4 which totally reflects one of the different laser wavelengths λl and λ2 scanned and transmits the other laser wavelength λ2 is provided. It is interposed. That is, one laser wavelength λl passes through the lower resin layer 3 and is reflected between the lower resin layer 3 and the dielectric coating layer 4 and the other laser wavelength λ2 is transmitted through the upper portion. It is scanned toward the resin layer.
그리고 상부 수지층(2)의 내면에는 유전체 코팅층(4)을 통과한 레이저 파장(λ2)을 반사시키기 위한 반사막(5)이 전면적으로 도포된다.In addition, the inner surface of the upper resin layer 2 is entirely coated with a reflective film 5 for reflecting the laser wavelength? 2 passing through the dielectric coating layer 4.
이와같이 구성된 광 디스크에 정보를 기록/재생하기 위해서는 2가지이상의 파장을 가지는 레이저 비임을 발생시키는 광 픽업이 필요하게 된다.In order to record / reproduce information on the optical disk configured as described above, an optical pickup for generating a laser beam having two or more wavelengths is required.
그러나 현재 사용되는 광 픽업은 제2도에 도시된 바와 같이 어느 한가지의 파장(통상적으로 780nm)을 갖는 레이저 비임을 주사하는 레이저 다이오드(10)와, 빔 스프리터(20) 및 포토다이오드(30)를 통해 몸체의 한면에 한개의 기록/재생을 행하도록 구성된 것이어서, 전술한 바와 같이 한면에 복수개의 기록층이 적층 형성된 광 디스크를 사용할 수 없게 되는 문제점이 있다.However, currently used optical pickups use a laser diode 10, a beam splitter 20 and a photodiode 30, which scan a laser beam having any one wavelength (typically 780 nm) as shown in FIG. There is a problem in that it is configured to perform one recording / reproducing on one side of the body, and as described above, an optical disc in which a plurality of recording layers are stacked on one side cannot be used.
본 발명은 상술한 문제점을 해결하기 위하여 창출된 것으로서, 한면에 2층 이상의 기록층이 적층 형성된 광 디스크의 기록/재생을 용이하게 실현할수 있는 광 픽업 시스템을 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an optical pickup system that can easily realize recording / reproducing of an optical disc in which two or more recording layers are stacked on one surface.
이와같은 목적을 달성하기 위하여 본 발명은 한쪽면에 복수개의 기록층을 가지는 광디스크를 기록/재생하는 광 픽업 시스템에 있어서, 서로 다른 P편광과 S편광을 순차적으로 각각 발생시키며 서로 수직방향으로 배열설치된 제1및 제2편광 레이저와; 상기 제1및 제2편광 페이저의 광 경로상에 위치되며 상기 광디스크를 향해 대면하는 위치의 제1편팡 레이저로부터 밭생된 P 편광은 전투과시키고, 수직방향의 제2편광 레이저로부터 발생된 S편광은 전반사시키며, 상기 광디스크의 각 기록면으로부터 반사된 광비임의 각각을 상기 제1및 제2편깡 페이저를 향해 전투과 또는 전반사시키는 편광 프리즘과; 상기 편광 프리즘과 상기 광디스크사이에 위치되어, 상기 편광 프리즘을 투과하는 광비임을 상기 광더스크의 각각의 기록면상에 접속하는 접속수단을 포함하고; 상기 제1및 제2편광 레이저는 상기 편광의 어느 하나를 발생하는 레이저 다이오드아, 이 레이저 다이오드로 부터 발생된 광비임을 상기 편광 프리즘을 향해 주사하고, 상기 광디스크로부터.: 반사된 광을 회절시키는 홀로그램과, 상기 회절광으로부터 포커싱 신호 및 트랙킹 신호를 검출하는 포토 다이오드를 각각 가지는 것을 특징으로 한다.In order to achieve the above object, the present invention provides an optical pickup system for recording / reproducing an optical disc having a plurality of recording layers on one side, and generates different P and S polarizations sequentially and is arranged in a vertical direction. First and second polarization lasers; The P polarization generated from the first polarization laser at the position facing the optical disk and located on the optical paths of the first and second polarization phasers is combated, and the S polarization generated from the second polarization laser in the vertical direction is total reflection. A polarizing prism for combating or totally reflecting each of the light beams reflected from each recording surface of the optical disk toward the first and second knitting phasers; A connecting means located between the polarizing prism and the optical disk, for connecting a light beam passing through the polarizing prism on each recording surface of the optical dust; The first and second polarization lasers are laser diodes that generate either of the polarizations, and scan the light ratio generated from the laser diodes toward the polarization prism and from the optical disc: a hologram for diffracting the reflected light. And a photodiode for detecting a focusing signal and a tracking signal from the diffracted light, respectively.
이와같은 본 발명은, 서로 수직되는 방향으로 배열 설치된 제 1, 2 편광 레이저를 통해 서로 다른 P, S편광을 순차적으로 각각 발생시키고, 광디스크를 향해 대면하는 위치의 편광 레이저로부터 발생된 P 편광은 전투과시키고, 수직방향의 편광 레이저로부터 발생된 5 편광은 전반사시키므로서, 한쪽면에 2가지 이상의 기록층이 적층된 광 디스크의 기록/재생을 용이하게 실현하게 된다.The present invention sequentially generates different P and S polarizations through first and second polarization lasers arranged in a direction perpendicular to each other, and P polarization generated from a polarization laser at a position facing toward the optical disk is divided into battle and In addition, since the five polarizations generated from the vertically polarized laser are totally reflected, recording / reproducing of an optical disk having two or more recording layers laminated on one side can be easily realized.
이와같은 본 발명의 구성 및 이에 따른 작용효과는 후술하는 첨부된 도면을 참조한 발명의 상세한 설명을 통해 더욱 명확해 질 것이다.Such a configuration of the present invention and its effects will be more apparent through the following detailed description of the invention with reference to the accompanying drawings.
제3도는 본 발명에 따른 장 괵업 시스템을 도시한 개략도로서, 본 발명은 제1도에 도시된 광디스크를 참조하여 설명한다.FIG. 3 is a schematic diagram showing a bow-up system according to the present invention, the present invention being described with reference to the optical disc shown in FIG.
이에 도시된 바와 같이 본 발명에 따른 광 픽업 시스템은, 편광 프리즘(300)과, 이 편광 프리즘(300)을 중심으로 서로 수직방향으로 배열 설치되며 서로 다른 P, S 편광(λ1,λ2)을 발생시키는 제1, 2편광 레이저(100,200)를 구비한다. 편광 프리즘(300)은 실질적인 본 발명의 특징적인 구성요소로서, 그에 대면하는 제1편광 레이저(100)로 부터의 어느 하나의 P'편광(λl)은 전투과시키고, 수직하는 제2편광 레이저(200)로 부터의 다른 하나의 5 편광(λ2)은 전반사시 킨다.As shown in the drawing, the optical pickup system according to the present invention includes a polarizing prism 300 and arranged in a vertical direction with respect to the polarizing prism 300 and generating different P and S polarizations (λ1, λ2). First and second polarization laser (100,200) is provided. The polarizing prism 300 is a substantial component of the present invention, and any one of P ′ polarization λl from the first polarization laser 100 facing it is confronted with a vertical second polarization laser 200. The other 5 polarizations (λ2) from) are totally reflected.
한편, 편광 프리즘(300)의 어느 일측면과 대면하도록 설치되는 제1편광 레이저(100)와 편광 프리즘(300)의 타측면과 대 향하도록 설치된 제2편광 레이저(200)의 구조를 보면, 각각의 캡(110,210)의 내무에는 서로 다른 P, S 편광(λl,λ2)을 발생하는 레이저 다이오드(120,220)가 마련된다. 그리고 각각의 캡(110,220)의 상부에는 레이저 다이오드(120,220)로 부터 발생된 편광을 편광 프리즘(300)을 향해 주사하고, 광디스크(1)로부터 반사된 광을 회절시키는 홀로그램(130,230)이 마련되며, 레이저 다이오드(120,220)와 인접된 위치에 흘로그램(130,230)의 회절광으로부터 포커싱신호 및 트랙킹 신호를 검출하는 포토 다이오드(130,230)를 구비한다.On the other hand, looking at the structures of the first polarization laser 100 and the second polarization laser 200 provided to face the other side of the polarizing prism 300 is installed to face one side of the polarizing prism 300, respectively The interior of the caps 110 and 210 is provided with laser diodes 120 and 220 for generating different P and S polarizations λ 1 and λ 2. And the upper portion of each cap (110,220) is provided with holograms (130,230) for scanning the polarization generated from the laser diode (120,220) toward the polarization prism 300, and diffracts the light reflected from the optical disk (1), Photo diodes (130, 230) for detecting the focusing signal and the tracking signal from the diffracted light of the flow (130, 230) in a position adjacent to the laser diode (120, 220).
한편, 편광 프리즘(300)과 상기 광디스크(1)의 사이에는 편광 프리즘(300)를 통과하는 광비임을 광디스크(1)의 각각의 기록면인 상하부 수지층(2,3)상에 모으는 동시에, 상기 각 기록떤으로부터 반사된 광비임의 각각을 제1 및 제2편광 레이저(100,200)의 홀로그램(130,230)상에 집속하는 집속수단 예를들면 대물렌즈(400)가 위치된다.On the other hand, between the polarizing prism 300 and the optical disk 1, the light ratio passing through the polarizing prism 300 is collected on the upper and lower resin layers 2 and 3, which are recording surfaces of the optical disk 1, respectively. A focusing means, for example an objective lens 400, is positioned for focusing each of the light beams reflected from the recording beam on the holograms 130, 230 of the first and second polarization lasers 100,200.
이때, 바람직하게는 제1, 2편광 레이저(100,200)로부터 발생된 P, S 편광(λl, λ2)의 편광비가 100 : 1보다 크게 하는 것이 바람직하다.At this time, preferably, the polarization ratios of the P and S polarizations λl and λ2 generated from the first and second polarization lasers 100 and 200 are larger than 100: 1.
이와같이 구성된 본 발명에 따른 광 픽업은, 먼저 어느 하나의 편광 레이저 즉, 도시된 바와 같이, P 편광을 발생시키는 제1편광 레이저(100)의 레이저 다이오드(120)로부터 발생된 P 편광(λl)은 흘로그램(130)을 통과한 뒤, 편광 프리즘(300)에 의해 전투과되어 대물렌즈(400)을 통해, 제1도에 도시된 바와 같이, 상하부 수지층(2,3)중 어느 하나의 수지층 즉, 예를 들어 상부 수지층(2)에 집속됨으로서 이에 기록/재생을 행하게 된다. 이어서, 광디스크(1)의 상부 수지층(2)으로부터 반사된 비임은, 즉 트랙킹신호 및 포커스신호를 가진 비임은 다시 제1편광 레이저(100)의 흘로그램(130)을 거쳐 레이저 다이오드(120)와 인접한 부위에 설치된 포토 다이오드(140)에 집속됨에 따라, 포커스신호 및 트렉킹 신호를 검출하게 된다.In the optical pickup according to the present invention configured as described above, P polarized light λl generated from the laser diode 120 of the first polarized laser 100 that generates P polarized light, as shown in FIG. The resin layer of any one of the upper and lower resin layers (2, 3), as shown in FIG. 1, after being passed through the flowchart (130), is battled by the polarizing prism (300) and through the objective lens (400). That is, for example, by focusing on the upper resin layer 2, recording / reproducing is performed. Subsequently, the beam reflected from the upper resin layer 2 of the optical disc 1, that is, the beam having the tracking signal and the focus signal, is again passed through the flow 130 of the first polarization laser 100 and the laser diode 120. The focus signal and the tracking signal are detected by focusing on the photodiode 140 installed at a portion adjacent to the photodiode 140.
한편, 상부 수지층(2)에 기록/재생을 완료한 상태에서 하부 수지층(3)에 기록/재생을 행함에 있어서는, S 편광을 발생시키는 제2편광 레이저(200)의 레이저 다이오드(220)로 부터 발생된 S 편광(λ2)은 제1홀로그램 소자(100)의 레이저 다이오드(120)와 다른 편광(λ2)을 가지므로, 이 편광(λ2)은 편광 프리즘(300)의 특성에 의해 전투과되지 않고 전반사되어 대물렌즈(400)를 거쳐 하부 수지층(3)에 기록/재생을 행하게 된다 그리고, 광디스크(1)로부터 반사된 비임은 트랙킹신호와 포커싱신호를 갖고 있는 것으로서, 다시 편광 프리즘(300)과 홀로그램(230)을 통해 회절되어 레이저 다이오드(220)와 인접된 부위에 설치된 포토 다이오드(240)에 집 속됨으로써 트랙킹신호 및 포커스 신호를 검출하게 된다.On the other hand, when recording / reproducing to the lower resin layer 3 in the state where recording / reproducing to the upper resin layer 2 is completed, the laser diode 220 of the second polarization laser 200 which generates S polarization. Since the S-polarized light λ2 generated from Δ has a different polarization λ2 from the laser diode 120 of the first hologram element 100, the polarized light λ2 is not caused by the characteristics of the polarization prism 300. And total reflection is performed to record / reproduce the lower resin layer 3 through the objective lens 400. The beam reflected from the optical disc 1 has a tracking signal and a focusing signal, and is again polarized prism 300. And diffraction through the hologram 230 and focused on the photodiode 240 installed in the region adjacent to the laser diode 220 to detect the tracking signal and the focus signal.
상술한 바와 같이 본 발명에 따른 광 픽업 시스템에 의하면, 서로 다른 P, S 편광을 제1, 2편광 레이저를 통해 순차적으로 각각 발생시키고, 이러한 P, S편광을 편광 프리즘을 통해 각각 검출할 수 있는 것이어서, 한쪽면에 복수의 기록층을 가지고 있는 광 디스크에 용이하게 기록/재생을 행하게 된다As described above, according to the optical pickup system according to the present invention, different P and S polarizations are sequentially generated through the first and second polarization lasers, respectively, and P and S polarizations can be respectively detected through the polarization prism. In this case, recording / reproducing is easily performed on an optical disk having a plurality of recording layers on one side.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940010434A KR0171077B1 (en) | 1994-05-13 | 1994-05-13 | A recording and reproducing optical pickup system for optical disk with plural recording layer in one side by generating successively different polarization beam |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019940010434A KR0171077B1 (en) | 1994-05-13 | 1994-05-13 | A recording and reproducing optical pickup system for optical disk with plural recording layer in one side by generating successively different polarization beam |
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| KR950034119A KR950034119A (en) | 1995-12-26 |
| KR0171077B1 true KR0171077B1 (en) | 1999-04-15 |
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| KR1019940010434A KR0171077B1 (en) | 1994-05-13 | 1994-05-13 | A recording and reproducing optical pickup system for optical disk with plural recording layer in one side by generating successively different polarization beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100595412B1 (en) * | 1996-10-21 | 2006-09-22 | 도이체 톰손-브란트 게엠베하 | Device for reading from or writing to an optical recording medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100595412B1 (en) * | 1996-10-21 | 2006-09-22 | 도이체 톰손-브란트 게엠베하 | Device for reading from or writing to an optical recording medium |
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