KR200180195Y1 - Optical pickup - Google Patents
Optical pickup Download PDFInfo
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- KR200180195Y1 KR200180195Y1 KR2019970023241U KR19970023241U KR200180195Y1 KR 200180195 Y1 KR200180195 Y1 KR 200180195Y1 KR 2019970023241 U KR2019970023241 U KR 2019970023241U KR 19970023241 U KR19970023241 U KR 19970023241U KR 200180195 Y1 KR200180195 Y1 KR 200180195Y1
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- South Korea
- Prior art keywords
- light
- disk
- optical pickup
- beam splitter
- laser diode
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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
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- 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
-
- 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
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
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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
- G11B7/1395—Beam splitters or combiners
-
- 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
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
Abstract
광픽업장치에 관해 개시된다. 개시된 광픽업장치는 레이저 다이오드로 부터의 광이 입사되는 빔분할기의 입사면에 레이저 빔의 중간영역의 광을 차단, 산란, 흡수하는 광제어수단이 마련되어 있다. 이러한 본 고안에 의하면, 디스크로 반사된 광의 손실이 방지되고, 따라서 광이용효율이 향상된다.An optical pickup apparatus is disclosed. The disclosed optical pickup apparatus is provided with light control means for blocking, scattering, and absorbing light in an intermediate region of a laser beam on an incident surface of a beam splitter in which light from a laser diode is incident. According to this invention, the loss of the light reflected by the disk is prevented, and thus the light utilization efficiency is improved.
Description
본 고안은 두께가 다른 디스크에 정보를 기록하고 재생하는 광픽업장치에 관한 것으로서, 디스크로부터 반사된 광의 손실이 억제된 광픽업장치에 관한 것이다.The present invention relates to an optical pickup apparatus for recording and reproducing information on a disc having a different thickness, and relates to an optical pickup apparatus in which loss of light reflected from the disk is suppressed.
두께가 다른 디스크에 정보를 기록하고 재생하는 광픽업장치에 레이저 다이오드로부터 출사된 레이저 빔 중, 수차 발생의 요인이 되는 중간영역의 광, 즉, 빔의 중심영역 주변을 광을 차단하는 광픽업이 공지되었다.An optical pickup device for recording and reproducing information on a disc having a different thickness is used to detect light in an intermediate region that causes aberration, that is, an optical pickup that blocks light around a central region of the beam. Known.
도 1은 종래 광픽업장치의 개략적 구성도이다.1 is a schematic configuration diagram of a conventional optical pickup apparatus.
디스크(1)와 레이저 다이오드(5)의 사이에 광출사방향으로 콜리메이팅 렌즈(4), 빔 분할기(3), 대물렌즈(2)가 위치하고, 빔분할기(3)로부터 반사된 광진행 경로 상에 검출렌즈(6) 및 광 검출기(7)가 설치된다. 위의 구조에서, 상기 대물렌즈(2)에는 소위 광 제어수단으로서의 광제어막(21)이 형성되어 있다. 상기 광제어막(21)은 레이저 다이오드(5)에서 출사된 레이저 빔의 중심축과 원축사이 영역의 광이 디스크(5)의 초점 위치에 도달되지 않도록 차단 또는 흡수 또는 산란하다. 이와 같이 함으로써 디스크에 형성되는 빔스포트의 질을 악화시키는 중간영역의 광이 차단되고 따라서, 두께가 다른 디스크에 정보를 기록하거나 이로부터 정보를 재생할 수 있게 된다.The collimating lens 4, the beam splitter 3, and the objective lens 2 are positioned between the disk 1 and the laser diode 5 in the light output direction and on the light traveling path reflected from the beam splitter 3. The detection lens 6 and the photodetector 7 are provided. In the above structure, the objective lens 2 is formed with a light control film 21 as so-called light control means. The light control film 21 blocks or absorbs or scatters the light in the region between the central axis and the circular axis of the laser beam emitted from the laser diode 5 so as not to reach the focal position of the disk 5. In this way, light in the intermediate region, which deteriorates the quality of the beam spot formed on the disk, is blocked, and thus information can be recorded on or reproduced from the disk having a different thickness.
그러나, 이러한 종래 광픽업의 문제는 상기 광 제어막(21)이 디스크로 입사하는 광과 그리고 반사되는 광의 경로 상에 마련되어 있어서, 디스크로부터 반사된 광이 통과하면서 광학적 오차에 의해 일정량이 손실될 수 있다는 것이다. 즉, 상기 광제어막(21)은 입사되는 광에 대해서만 광제어작용이 필요한데, 전술한 바와 같이 광입사 및 반사경로 상에 마련되어 있어서 도 1에서 빗금을 친 부분에서와 같이 광검출기(7)로 향하는 반사광의 손실이 일어난다. 이러한 광손실은 결과적으로 광이용효율의 저하에 관계되기 때문에 이것이 과다할 경우 레이저 다이오드의 출력을 높여야 한다.However, the problem of the conventional optical pickup is that the light control film 21 is provided on the path of the light incident on the disk and the reflected light, so that a certain amount may be lost due to an optical error while the light reflected from the disk passes. Is there. That is, the light control film 21 needs a light control action only on the incident light, and is provided on the light incidence and reflection paths as described above, so that the light control film 21 is moved to the photodetector 7 as shown in FIG. Loss of reflected light occurs. Since this optical loss is consequently related to the decrease in the light utilization efficiency, if this is excessive, the output of the laser diode must be increased.
본 고안은 반사광의 손실이 억제된 광픽업장치를 제공함에 그 목적이 있다.An object of the present invention is to provide an optical pickup device in which loss of reflected light is suppressed.
또한 광이용효율이 증대된 광픽업장치를 제공함에 그 목적이 있다.In addition, an object of the present invention is to provide an optical pickup device having an increased light utilization efficiency.
도 1은 종래 광픽업장치의 개략적 구성도,1 is a schematic configuration diagram of a conventional optical pickup device;
도 2는 본 고안에 따른 광픽업장치의 한 실시예의 개략적 구성도,2 is a schematic structural diagram of an embodiment of an optical pickup apparatus according to the present invention;
도 3은 도 2에 도시된 광픽업장치의 빔 분할기를 발췌도시한 평면도,3 is a plan view showing an extractor of the beam splitter of the optical pickup device shown in FIG.
도 4는 본 고안에 따른 광픽업장치에 적용될 수 있는 다른 유형의 빔분할기이 개략적 평면도,4 is a schematic plan view of another type of beam splitter that can be applied to an optical pickup apparatus according to the present invention;
도 5는 도 4의 A 부분의 확대도.5 is an enlarged view of a portion A of FIG. 4.
상기의 목적을 달성하기 위하여, 본 고안에 의하면, 디스크에 대면하는 대물렌즈와, 상기 대물렌즈를 통해 상기 디스크에 레이저 빔을 조사하는 레이저 다이오드와, 상기 대물렌즈와 상기 레이저 다이오드의 사이에 마련되어 상기 디스크에서 반사된 광을 분리하는 빔분할기와, 상기 빔분할기로부터 반사된 광을 검출하는 광검출기 및 상기 디스크로 입사되는 레이저 빔의 중간영역의 광을 제어하는 광제어수단을 구비하는 광픽업장치에 있어서, 상기 광제어수단이 상기 레이저다이오드로 부터의 레이저 빔이 입사되는 상기 빔 분할기의 입사면에 형성되어 있는 광픽업장치가 제공된다.In order to achieve the above object, according to the present invention, provided between the objective lens and the laser diode for irradiating a laser beam to the disk through the objective lens, and between the objective lens and the laser diode And a beam splitter for separating the light reflected from the disk, a photo detector for detecting the light reflected from the beam splitter, and an optical control means for controlling light in an intermediate region of the laser beam incident on the disk. An optical pickup apparatus is provided in which the light control means is formed on an incident surface of the beam splitter to which a laser beam from the laser diode is incident.
상기 본 고안에 있어서, 상기 광 제어수단은 상기 빔분할기의 입사면에 형성되는 코팅층에 의해 마련되거나, 상기 입사면에 광을 산란 또는 회절 또는 차단할 수 있는 패턴을 형성하도록 하는 것이 바람직하다.In the present invention, the light control means is preferably provided by a coating layer formed on the incident surface of the beam splitter, or to form a pattern for scattering, diffraction or blocking light on the incident surface.
이하 첨부된 도면을 참조하면서, 본 고안에 따른 바람직한 실시예의 광픽업장치를 상세히 설명한다.Hereinafter, an optical pickup apparatus of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
도 2를 참조하면, 디스크(100)와 레이저 다이오드(500)의 사이에 광출사방향으로 콜리메이팅 렌즈(400), 빔 분할기(300), 대물렌즈(200)가 위치하고, 빔분할기(300)로부터 반사된 광진행 경로 상에 검출렌즈(600) 및 광 검출기(700)가 설치된다. 위의 구조에서, 본 고안을 특징지우는 것으로서 상기 레이저 다이오드(100)로 부터의 레이저 빔이 입사하는 상기 빔분할기(300)의 입사면에 광 제어수단으로서 광제어막(310)이 형성되어 있다. 상기 광제어막(310)은 레이저 다이오드(500)에서 출사된 레이저 빔의 중심축과 원축사이 영역의 광이 디스크(500)의 초점 위치에 도달되지 않도록 차단 또는 흡수 또는 산란하다. 이와 같이 함으로써 디스크에 형성되는 빔스포트의 질을 악화시키는 중간영역의 광이 차단되고 따라서, 두께가 다른 디스크에 정보를 기록하거나 이로부터 정보를 재생할 수 있게 된다.Referring to FIG. 2, the collimating lens 400, the beam splitter 300, and the objective lens 200 are positioned between the disk 100 and the laser diode 500 in the light output direction, and from the beam splitter 300. The detection lens 600 and the photo detector 700 are installed on the reflected light traveling path. In the above structure, as a feature of the present invention, a light control film 310 is formed on the incidence surface of the beam splitter 300 on which the laser beam from the laser diode 100 is incident, as a light control means. The light control layer 310 blocks or absorbs or scatters the light in the region between the central axis and the circular axis of the laser beam emitted from the laser diode 500 so as not to reach the focal position of the disk 500. In this way, light in the intermediate region, which deteriorates the quality of the beam spot formed on the disk, is blocked, and thus information can be recorded on or reproduced from the disk having a different thickness.
레이저 다이오드(100)로부터 출사한 레이저 빔의 중간영역의 광이 빔 분할기(300)에 입사하기전 빔분할기(300)의 입사면에 형성된 광제어막(310)에 의해 차단, 산란 또는 흡수되게 된다. 따라사 이와 같이 중간영역의 광이 제거된 레이저 빔을 빔분할기(300)와 대물렌즈(200)를 통과한 후 디스크(500)에 양호한 빔 스포트를 형성할 수 있게 된다. 그리고, 디스크에서 반사된 광은 역으로 대물렌즈(200)를 통과한 후 빔분할기(300)에서 반사되어 광 검출기(700)로 입사한다.Light in the middle region of the laser beam emitted from the laser diode 100 is blocked, scattered, or absorbed by the light control layer 310 formed on the incident surface of the beam splitter 300 before entering the beam splitter 300. . Accordingly, after passing the laser beam from which light in the intermediate region is removed, the beam splitter 300 and the objective lens 200 may be passed to form a good beam spot on the disk 500. The light reflected from the disk passes through the objective lens 200 and is reflected by the beam splitter 300 to be incident to the photo detector 700.
이상과 같은 구조에 의하면 디스크(500)에서 반사된 광은 종래와 같이 광제어막을 다시 통과하지 않고 반사된 광 전체가 빔분할기(300)와 검출렌즈(600)를 거쳐 광 검출기(700)로 입사한다. 이러한 작용은 종래의 광픽업과 대별된다. 종래의 경우는 디스크에서 반사된 광이 다시 한번 광제어막을 통과하기 때문에 광학적 오차 등에 의해 원치않는 광의 손실이 발생될 수 있으나, 본 고안의 광픽업은 광제어막이 상기 디스크로 부터의 반사광의 진행경로의 바깥에 있기 때문에 광제어막에 의한 광손실의 우려가 없다.According to the above structure, the light reflected from the disk 500 does not pass again through the light control layer as before, and the entire reflected light enters the photo detector 700 via the beam splitter 300 and the detection lens 600. do. This action is largely different from conventional optical pickups. In the conventional case, since the light reflected from the disk passes once again through the light control film, unwanted light loss may occur due to optical error. However, in the optical pickup of the present invention, the light control film has a traveling path of reflected light from the disk. Since it is outside of, there is no fear of light loss due to the light control film.
한편, 상기 광제어수단은 도 2와 도 3에 도시된 바와 같이 빔 분할기(300)의 측면에 형성되는 광제어막(310)에 의해 제공될 수 도 있고, 도 4와 도 4의 A 부분을 확대도시한 제5도에서 처럼 빔 분할기(300)의 측면을 가공하여 광을 차단, 산란 또는 흡수할 수 있는 패턴(311)에 의해 제공될 수 도 있다On the other hand, the light control means may be provided by the light control film 310 formed on the side of the beam splitter 300 as shown in Figs. 2 and 3, the portion A of Figs. As shown in FIG. 5, the side surface of the beam splitter 300 may be processed and provided by a pattern 311 capable of blocking, scattering, or absorbing light.
상기한 바와 같이 본 고안에 따른 광픽업장치는 광제어수단에 의한 반사광의 손실이 없기 때문에 광이용효율이 높다, 이러한 광이용효율의 증대는 레이저 다이오드의 출력부담을 줄이고 나아가서는 소비전력을 감소시킬 수 있다.As described above, the optical pick-up apparatus according to the present invention has high light utilization efficiency because there is no loss of reflected light by the light control means. This increase in optical utilization efficiency reduces the output burden of the laser diode and further reduces power consumption. Can be.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019970023241U KR200180195Y1 (en) | 1997-08-26 | 1997-08-26 | Optical pickup |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019970023241U KR200180195Y1 (en) | 1997-08-26 | 1997-08-26 | Optical pickup |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR19990009979U KR19990009979U (en) | 1999-03-15 |
| KR200180195Y1 true KR200180195Y1 (en) | 2000-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019970023241U Expired - Fee Related KR200180195Y1 (en) | 1997-08-26 | 1997-08-26 | Optical pickup |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100544176B1 (en) * | 1999-08-19 | 2006-01-23 | 삼성전자주식회사 | Surface light laser and optical pickup device using same |
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1997
- 1997-08-26 KR KR2019970023241U patent/KR200180195Y1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100544176B1 (en) * | 1999-08-19 | 2006-01-23 | 삼성전자주식회사 | Surface light laser and optical pickup device using same |
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| KR19990009979U (en) | 1999-03-15 |
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