KR950004139A - Optical pickup device for magneto-optical disk - Google Patents
Optical pickup device for magneto-optical disk Download PDFInfo
- Publication number
- KR950004139A KR950004139A KR1019930013472A KR930013472A KR950004139A KR 950004139 A KR950004139 A KR 950004139A KR 1019930013472 A KR1019930013472 A KR 1019930013472A KR 930013472 A KR930013472 A KR 930013472A KR 950004139 A KR950004139 A KR 950004139A
- Authority
- KR
- South Korea
- Prior art keywords
- optical
- splitting means
- beam splitting
- waves
- wave
- 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
- G11B7/1356—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
- 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
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
본 발명은 광자기 디스크의 광픽업 장치에 관한 것으로서, 변형된 편광빔 분할수단과 한개의 광검출수단을 사용하여 포커스 에러와 트랙킹 에러 및 디스크상에 기록된 광자기신호의 정확한 검출은 물론 광학부품의 감소 및 부피의 축소에 따른 픽업자체의 경량화와 독취속도를 향상시키도록 한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for a magneto-optical disk, wherein the modified polarization beam splitting means and one optical detection means use the optical component as well as the accurate detection of the focus error and tracking error and the magneto-optical signal recorded on the disc. It is to reduce the weight of the pickup itself and to reduce the reading speed by reducing the volume and to reduce the volume.
이와 같은 본 발명의 목적은 레이저부재로부터 발산된 레이저빔이 시준렌즈, 제 1 편광빔 분할수단 및 대물렌즈를 통해 광디스크상에 집광되고 그로부터 역순으로 처리되어 상기 제 1 편광빔 분할수단을 통해 반사되는 S파의 전부와 P파의 일부를 입사받아 편광방향을 45°로 회전시키는 반파장대와, 상기 반파장대를 통해 입사되는 빔을 S파와 P파로 분리하여 두 파를 동일한 방향으로 출사시키는 제 2 편광빔 분할수단과, 상기 제 2 편광빔 분할수단에서 반사된 S파와 P파와의 합,차신호로 트랙킹 에러, 포커스 에러 및 광정보신호를 검출하는 8분할된 광검출기로 이루어짐으로써 달성된다.The object of the present invention is that the laser beam emitted from the laser member is focused on the optical disk through the collimating lens, the first polarizing beam splitting means and the objective lens, and processed in reverse order therefrom to be reflected by the first polarizing beam splitting means. A half-wavelength that receives all of the S-waves and a portion of the P-wave and rotates the polarization direction by 45 °, and a second polarization that separates the beams incident through the half-wavelength into S- and P-waves and emits the two waves in the same direction And an eight-segmented photodetector for detecting the tracking error, the focus error and the optical information signal by the sum of the beam splitting means and the S-wave and the P-wave reflected by the second polarization beam splitting means, the difference signal.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제 2 도는 본 발명 광자기 디스크의 광픽업 장치의 구성도, 제 3 도는 제 2 도 광검출기를 상세하게 도시한 블럭도, 제 4 도는 광디스크와 대물렌즈 간격 변화에 따른 광검출기상에 집속되는 빔의 변화를 보인도로서, (a)는 포커스 에러 발생이 없을시의 빔의 집속 상태도이고, (b)는 대물렌즈와 광디스크간의 간격이 가까워짐(포커스 에러 발생)에 따른 빔의 집속 상태도이며, (c)는 대물렌즈와 광디스크간의 간격이 멀어짐(포커스 에러 발생)에 따른 빔의 집속 상태도.2 is a block diagram showing an optical pickup device of the magneto-optical disk of the present invention, FIG. 3 is a block diagram showing the photodetector in detail, and FIG. 4 is a beam focused on the photodetector according to the change of the optical disk and the objective lens. (A) is the beam focusing state diagram when no focus error occurs, (b) is the beam focusing state diagram as the distance between the objective lens and the optical disk gets closer (focus error occurs). c) is a focus state of the beam according to the distance between the objective lens and the optical disk (focus error occurs).
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930013472A KR960000270B1 (en) | 1993-07-16 | 1993-07-16 | Optical pick-up apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930013472A KR960000270B1 (en) | 1993-07-16 | 1993-07-16 | Optical pick-up apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
KR950004139A true KR950004139A (en) | 1995-02-17 |
KR960000270B1 KR960000270B1 (en) | 1996-01-04 |
Family
ID=19359439
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019930013472A KR960000270B1 (en) | 1993-07-16 | 1993-07-16 | Optical pick-up apparatus |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR960000270B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100377886B1 (en) * | 1998-12-16 | 2003-07-16 | 삼성엔지니어링 주식회사 | Catalyst for removing organic chlorine compounds and preparing method thereof |
-
1993
- 1993-07-16 KR KR1019930013472A patent/KR960000270B1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100377886B1 (en) * | 1998-12-16 | 2003-07-16 | 삼성엔지니어링 주식회사 | Catalyst for removing organic chlorine compounds and preparing method thereof |
Also Published As
Publication number | Publication date |
---|---|
KR960000270B1 (en) | 1996-01-04 |
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