KR960013492B1 - Optical pick-up - Google Patents
Optical pick-up Download PDFInfo
- Publication number
- KR960013492B1 KR960013492B1 KR1019930025867A KR930025867A KR960013492B1 KR 960013492 B1 KR960013492 B1 KR 960013492B1 KR 1019930025867 A KR1019930025867 A KR 1019930025867A KR 930025867 A KR930025867 A KR 930025867A KR 960013492 B1 KR960013492 B1 KR 960013492B1
- Authority
- KR
- South Korea
- Prior art keywords
- light
- beam splitter
- recording medium
- optical recording
- optical
- Prior art date
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Classifications
-
- 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
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
-
- 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
- G11B7/1395—Beam splitters or combiners
Abstract
Description
제1도는 종래의 광픽업을 도시한 개략도.1 is a schematic diagram showing a conventional optical pickup.
제2도는 본 발명에 따른 광픽업을 도시한 개략도.2 is a schematic diagram illustrating an optical pickup according to the present invention.
제3도는 제2도에 도시된 홀로그램패턴의 평면도.3 is a plan view of the hologram pattern shown in FIG.
제4도 (a)(b)(c)는 제2도에 도시된 5분할 포토다이오드의 신호검출 상태를 나타낸 참고도.4 (a), (b) and (c) are reference diagrams showing signal detection states of the five-segment photodiode shown in FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11 : 레이저 다이오드 12 : 회절격자11 laser diode 12 diffraction grating
13 : 빔스프리터 14 : 대물렌즈13 beam splitter 14 objective lens
15 : 5분할 포토다이오드 16 : 홀로그램패턴15: 5-divided photodiode 16: Hologram pattern
20 : 광기록매체20: optical recording medium
본 발명은 광픽업에 관한 것으로서, 더 상세하게는 포토 다이오드의 위치 조정 및 신호검출이 용이하도록 개선된 광픽업에 관한 것이다.The present invention relates to an optical pickup, and more particularly, to an improved optical pickup to facilitate positioning and signal detection of a photodiode.
일반적으로 광픽업은 광기록매체에 빔을 주사하고 광기록 매체로부터 반사되는 빔을 검출하여 정보의 광학적 기록 또는 재생 동작을 수행하는 것으로서, LDP(laser disk player), CDP(compact disk player)등에 사용된다.In general, optical pickup is to perform optical recording or reproducing of information by scanning a beam onto an optical recording medium and detecting a beam reflected from the optical recording medium. The optical pickup is used for a laser disk player (LDP) and a compact disk player (CDP). do.
제1도에 이러한 광픽업의 일예가 도시되어 있다.An example of such an optical pickup is shown in FIG.
이것은 광을 발생시키는 레이저 다이오드(1)와 회절격자(2) 및 빔 스프리터(3)가 동일 광축상에 배치되고, 빔 스피리터(3)의 직상방에는 광을 광기록매체(6)로 집속시키는 대물렌즈(4)가 배치되며, 빔 스프리터(3)의 직하방에는 광기록 매체(6)로 부터 반사되고 빔 스프리터(3)를 투과한 광이 집속되는 포토다이오드(5)가 배치되어 있다.This is because the laser diode 1, the diffraction grating 2, and the beam splitter 3, which generate light, are arranged on the same optical axis, and the light is focused on the optical recording medium 6 directly above the beam splitter 3. The objective lens 4 is arranged, and a photodiode 5 in which light reflected from the optical recording medium 6 and transmitted through the beam splitter 3 is focused directly below the beam splitter 3 is arranged. .
이와 같이 구성된 종래의 광픽업은 레이저 다이오드(1)로 부터 발생된 광이 회적격자(2)에 의해 0차, +1차, -1차의 빔으로 회절되고, 회절된 광은 빔 스프리터(3)에 의해 대물렌즈(4)로 반사된다.In the conventional optical pickup configured as described above, light generated from the laser diode 1 is diffracted by the beam lattice 2 into beams of order 0, +1 and -1, and the diffracted light is beam splitter 3 Is reflected by the objective lens 4 by
그리고 대물렌즈(4)로 반사된 광은 대물렌즈(4)에 의해 집속되어 광기록매체(6)에 포커싱되게 되며, 광기록매체(6)로 부터 반사된 광은 빔 스프리터(3)를 투과하여 포토다이오드(5)에 집속되게 됨으로써 반사된 광으로부터 신호를 검출하게 된다.The light reflected by the objective lens 4 is focused by the objective lens 4 to be focused on the optical recording medium 6, and the light reflected from the optical recording medium 6 passes through the beam splitter 3. By concentrating on the photodiode 5, a signal is detected from the reflected light.
그러나 이와같이 구성된 종래의 광픽업은, 광기록매체(6)로 부터 반사되는 광이 빔 스프리터(3)를 투과하여 포토다이오드(5)로 집속되는 과정에서 빔 스프리터(3)에 의해 수차가 발생되게 됨에 따라 광기록매체(6)로 부터 반사되는 광으로 부터 신호를 검출하기 어려울 뿐만아니라 포토다이오드(5)의 위치 조정이 어려운 문제점이 있었다.However, in the conventional optical pickup configured as described above, the aberration is generated by the beam splitter 3 while the light reflected from the optical recording medium 6 passes through the beam splitter 3 and is focused on the photodiode 5. As a result, it is not only difficult to detect a signal from light reflected from the optical recording medium 6, but also difficult to adjust the position of the photodiode 5.
본 발명은 상술한 바와같은 문제점을 감안하여 창출된 것으로서, 포토다이오드의 위치 조정 및 신호검출이 용이하도록 개선된 광픽업을 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide an improved optical pickup to facilitate position adjustment and signal detection of a photodiode.
상기의 목적을 달성하기 위하여 본 발명은, 광 발생수단과, 상기 광 발생수단으로부터 조사된 광의 경로를 변경시키는 빔스프리터와, 상기 빔스프리터에 의해 경로가 변경된 광을 광기록매체로 집속시키는 광집속수단과, 광기록매체로부터 반사되는 광을 검출하는 광검출수단을 구비하여 된 광픽업에 있어서, 상기 광검출수단은 5분할 포토 다이오드로 이루어지며, 상기 빔스프리터의 하면에는 상기 광기록매체로부터 반사된 광을 상기 5분할 포토 다이오드에 접속시키도록 서도 다른 2개의 패턴부를 갖는 홀로그램패턴을 마련하여 된 것을 그 특징으로 한다.In order to achieve the above object, the present invention provides a light generating means, a beam splitter for changing the path of the light irradiated from the light generating means, and a light focus for focusing the light whose path is changed by the beam splitter to the optical recording medium. Means and a light detecting means for detecting light reflected from the optical recording medium, wherein the light detecting means comprises a 5-split photodiode, and the lower surface of the beam splitter reflects from the optical recording medium. It is characterized in that a hologram pattern having two different pattern portions is provided so as to connect the light to the 5-split photodiode.
이하 첨부된 도면을 참조하여 본 발명에 따른 바람직한 실시예를 상세하게 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명에 따른 광픽업은 제2도에 도시되어 있는 바와같이, 광 발생수단인 레이저 다이오드(11)의 전면에 회적격자(12)와 빔 스프리터(13)가 동일한 광축상에 배치된다.In the optical pick-up according to the present invention, as shown in FIG. 2, the gray lattice 12 and the beam splitter 13 are disposed on the same optical axis in front of the laser diode 11 as the light generating means.
그리고 빔 스프리터(13)의 직상방에는 광을 광기록 매체(20)로 집속시키는 광집속수단인 대물렌즈(14)로 배치되고, 빔 스프리터(13)의 직하방에는 광기록매체(20)로 부터 반사되는 광을 검출하는 광검출수단인 5분할 포토다이오드(15)가 배치된다.In addition, the beam splitter 13 is disposed at an objective lens 14, which is an optical focusing means for focusing light onto the optical recording medium 20, and directly below the beam splitter 13, at an optical recording medium 20. The 5-divided photodiode 15, which is a light detecting means for detecting light reflected from the light, is disposed.
그리고 상기 빔 스프리터(13)의 하면에는 광기록매체(20)로 부터 반사된 광을 5분할 포토다이오드(15)로 집광시키는 홀로그램패턴(16)이 형성된다.A hologram pattern 16 is formed on the bottom surface of the beam splitter 13 to condense the light reflected from the optical recording medium 20 to the 5-divided photodiode 15.
여기에서 상기 홀로그램패턴(16)은 제3도에 도시되어 있는 바와 같이 서로 다른 2개의 패턴으로 형성되는 바, 이 홀로그램패턴(16)은 빔 스프리터(13)상에 직접 형성하거나 또는 별도로 형성하여 빔 스프리터(13)상에 부착시킬 수 있다.Here, the hologram pattern 16 is formed in two different patterns, as shown in FIG. 3, and the hologram pattern 16 is formed directly on the beam splitter 13 or separately and beams. It can be attached on the splitter 13.
이와 같이 구성된 본 발명에 따른 광픽업은 다음과 같이 동작된다.The optical pickup according to the present invention configured as described above is operated as follows.
먼저 광 발생수단인 레이저 다이오드(11)로부터 주사된 광이 회절격자(12)에 의해 0차, +1차, -1차의 광으로 회절되고, 회절된 광은 빔 스프리터(13)에 의해 대물렌즈(14)로 주사된다.First, the light scanned from the laser diode 11, which is a light generating means, is diffracted by the diffraction grating 12 into light of 0th order, + 1st order, and -1st order, and the diffracted light is objectively carried out by the beam splitter 13 Scanned by the lens 14.
그리고 대물렌즈(14)로 주사된 광은 대물렌즈(14)에 의해 광기록매체(20)에 집속되어 광기록매체(20)에 기록된 정보를 재생하거나 반대로 광기록매체(20)에 정보를 기록하게 된다.The light scanned by the objective lens 14 is focused on the optical recording medium 20 by the objective lens 14 to reproduce the information recorded on the optical recording medium 20 or vice versa. Will be recorded.
그리고 광기록매체(20)로 부터 반사된 광은 대물렌즈(14)와 빔 스프리터(13)를 투과하여 5분할 포토다이오드(15)로 집속되게 됨으로써 반사된 광으로 부터 에러신호를 검출하게 된다.The light reflected from the optical recording medium 20 is transmitted through the objective lens 14 and the beam splitter 13 to be focused on the 5-divided photodiode 15 to detect an error signal from the reflected light.
이때 빔 스프리터(13)의 하면에 홀로그램패턴(16)이 형성되어 있으므로, 광기록매체(20)의 위치에 따라 이로 부터 반사된 광이 홀로그램 패턴(16)에 의해 제4도에 도시되어 있는 바와같이 5분할 포토다이오드(15)로 집속되게 됨에따라 포토다이오드의 위치 조정이 용이하고, 또한 신호검출이 용이하게 된다.In this case, since the hologram pattern 16 is formed on the lower surface of the beam splitter 13, the light reflected therefrom according to the position of the optical recording medium 20 is illustrated in FIG. 4 by the hologram pattern 16. As a result, the photodiode is focused on the five-split photodiode 15, so that the position of the photodiode can be easily adjusted and the signal can be easily detected.
즉, 도면에서 제4도 (a)는 광기록매체가 가까이 있는 경우이고, 제4도 (b)는 광기록매체가 합촛점에 있는 경우이며, 제4도 (c)는 광기록매체가 멀리 있는 경우를 나타낸다.That is, FIG. 4 (a) shows the case where the optical recording medium is close, FIG. 4 (b) shows the case where the optical recording medium is at the confocal point, and FIG. Indicates if present.
이상에서 설명한 바와 같이 본 발명 광픽업에 의하면, 빔 스프리터의 하면에 광기록매체로 부터 반사된 광을 포토다이오드로 집속시키는 홀로그램패턴이 형성되어 있으므로, 포토다이오드의 위치 조정이 용이하고, 또한 신호검출이 용이한 이점이 있다.As described above, according to the optical pickup of the present invention, since the hologram pattern for converging the light reflected from the optical recording medium to the photodiode is formed on the lower surface of the beam splitter, the position of the photodiode is easily adjusted, and the signal detection This is an easy advantage.
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KR1019930025867A KR960013492B1 (en) | 1993-11-30 | 1993-11-30 | Optical pick-up |
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KR1019930025867A KR960013492B1 (en) | 1993-11-30 | 1993-11-30 | Optical pick-up |
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KR960013492B1 true KR960013492B1 (en) | 1996-10-05 |
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KR100265732B1 (en) * | 1997-11-19 | 2000-09-15 | 윤종용 | Optical pickup |
KR100265733B1 (en) * | 1997-11-20 | 2000-09-15 | 윤종용 | Optical pickup |
KR100432660B1 (en) * | 2001-08-17 | 2004-05-22 | 삼성전기주식회사 | Optical pickup device |
KR100403597B1 (en) * | 2001-08-30 | 2003-10-30 | 삼성전자주식회사 | Optic pickup apparatus comprising a beamsplitter formed hologram and method of compensating of optic axes using the same |
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1993
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