KR960002194A - Pick-up device for magneto-optical disk using micro PBS block with photo diode - Google Patents

Pick-up device for magneto-optical disk using micro PBS block with photo diode Download PDF

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Publication number
KR960002194A
KR960002194A KR1019940013130A KR19940013130A KR960002194A KR 960002194 A KR960002194 A KR 960002194A KR 1019940013130 A KR1019940013130 A KR 1019940013130A KR 19940013130 A KR19940013130 A KR 19940013130A KR 960002194 A KR960002194 A KR 960002194A
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KR
South Korea
Prior art keywords
photodiode
magneto
optical disk
wave
signal
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KR1019940013130A
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Korean (ko)
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KR970004211B1 (en
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이형재
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이종수
엘지전자부품 주식회사
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Priority to KR1019940013130A priority Critical patent/KR970004211B1/en
Publication of KR960002194A publication Critical patent/KR960002194A/en
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Publication of KR970004211B1 publication Critical patent/KR970004211B1/en

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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
    • 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
    • G11B7/1362—Mirrors
    • 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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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

본 발명은 광자기 디스크용 픽업장치에 관한 것으로서, 특히 5분할 포토 다이오드와 마이크로 PBS블럭을 사용하여 포커스 서보 시그날(Focus Servo Signal) 및 RF시그날을 보다 쉽고 보다 저렴하게 검출할 수 있는 포토다이오드가 결합된 마이크로 PBS블럭을 사용한 광 자기 디스크용 픽업장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup device for a magneto-optical disk. In particular, a photodiode capable of detecting a focus servo signal and an RF signal more easily and cheaply by using a 5-split photo diode and a micro PBS block is combined. A pickup device for a magneto-optical disk using a micro PBS block.

종래의 광 자기 디스크용 픽업장치는 포토 다이오드로부터 포커스 서보 시그날을 얻기 위해서는 포토 다이오드의 셀(Cell)간격을 고려하여 일정한 배율로 빔을 공급하고 비점수차를 발생시키는 센서 렌즈를 사용하는데, 상기 기능을 수행하기 위해서 상기 센서 렌즈는 가공하기가 아주 어려운 실린더리컬 면으로 형성되어야만 하는 문제점이 있고, 상기 포토 다이오드로부터 RF시그날을 얻기 위해서는 P파와 S파를 분리하기 위하여 분할 프리즘을 사용하기 때문에 시스템의 사이즈가 커질뿐만 아니라 가격이 상승하는 문제점이 있다.In order to obtain a focus servo signal from a photodiode, a conventional pickup device for a magneto-optical disk uses a sensor lens that supplies a beam at a constant magnification and generates astigmatism in consideration of the cell spacing of the photodiode. In order to perform this, the sensor lens has to be formed of a cylindrical surface which is very difficult to process. In order to obtain an RF signal from the photodiode, a split prism is used to separate the P and S waves. Not only does it get bigger, but it also raises the price.

따라서, 본 발명은 상기 문제점을 해결하기 위해 분할 프리즘과, 실린더리컬 면으로 가공된 센서렌즈 대신에 마이크로 PBS블럭을 사용하여 종래의 가장 콤팩트 (Compact)한 형태라 일컬어지는 일본 샤프(SHARP)사의 홀로그램 모듈(Hologam Module)을 사용하였을 경우 보다 광자기 디스크용 픽업에서는 더욱 콤팩트하며, 가격이 저렴한 광자기 디스크용 픽업장치이다.Therefore, in order to solve the problem, the present invention uses a micro-PBS block instead of a split prism and a sensor lens processed into a cylindrical surface, and is a hologram of Japan Sharp Corporation, which is called the most compact form. It is a more compact and inexpensive pick-up device for magneto-optical disks than the case of using a module (Hologam Module).

Description

포토 다이오드가 결합된 마이크로 피비에스(PBS)블럭을 사용한 광자기 디스크용 픽업장치Pick-up device for magneto-optical disk using micro PBS block with photo diode

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명의 광자기 디스크용 픽업장치의 구성을 나타낸 도면.2 is a diagram showing a configuration of a pickup apparatus for a magneto-optical disk of the present invention.

제3도는 본 발명의 마이크로 PBS블럭의 구성을 나타낸 도면.3 is a diagram showing the configuration of a micro PBS block of the present invention.

제4도는 본 발명의 5분할 포토 다이오드 분할 형태를 나타낸 도면.4 is a diagram showing a five-segment photodiode dividing form of the present invention.

Claims (3)

150:1로 타원 편광된 빔(P파와 S파)을 발진시키는 레이저 다이오드(1)와, 상기 레이저 다이오드(1)에서 출력된 빔을 3개의 빔으로 회절시키는 회절기(2)와, 공급되는 빔중에서 P파는 50:50으로 반사 및 투과하고 S파는 95% 이상 반사하는 PBS블럭(101)과, 상기 PBS블럭(101)에서 공급되는 빔을 평행빔으로 변환시키는 집광렌즈(102)와, 공급되는 빔을 반사시키는 반사경(5)과, 상기 반사경(5)을 통해 공급되는 빔을 디스크(7)에 집광시키는 대물렌즈(6)와, 정보가 기록되어 있는 디스크(7)와, 공급되는 P파와 S파를 P파는 투과시키고 S파는 반사시켜서 포커스 에러 신호와 트랙킹 서보 신호와 RF신호를 검출하는 마이크로 PBS블럭(100)으로 구성된 것을 특징으로 하는 포토다이오드가 결합된 마이크로 피비에스(PBS)블럭을 사용한 광 자기 디스크용 픽업장치.A laser diode (1) for oscillating elliptically polarized beams (P waves and S waves) at 150: 1, a diffractometer (2) for diffracting the beam output from the laser diode (1) into three beams, and In the beam, P wave reflects and transmits at 50:50 and S wave reflects 95% or more, and a condenser lens 102 for converting the beam supplied from the PBS block 101 into a parallel beam; A reflector 5 for reflecting the beam to be used, an objective lens 6 for condensing the beam supplied through the reflector 5 on the disk 7, a disk 7 on which information is recorded, and a supplied P The microdiode-blocked photodiode (PBS) block is composed of a micro PBS block 100 which detects a focus error signal, a tracking servo signal, and an RF signal by transmitting a wave and an S wave, and reflecting the S wave. Pick-up device for used magneto-optical disk. 제1항에 있어서, 상기 마이크로 PBS블럭(100)은 PBS코팅되어 입사되는 빔을 P파는 투과시키고 S파는 반사시키는 a면(100-a)과, 무반사코팅되어 입사되는 빛을 무반사 투과시키는 b면(100-b), c면(100-c), d면(100-d)과, 5분할 되어 있으며 상기 b면(100-b)으로 입사되는 P파를 전기신호로 변환시켜 출력하는 5분할 포토다이오드A(PD1)와 5분할 되었으며 상기 d면(100-d)으로 입사되는 S파를 전기신호로 변환출력하는 5분할 포토다이오드B(PD2)로 구성된 것을 특징으로 하는 포토다이오드가 결합된 마이크로 피비에스(PBS)블럭을 사용한 광 자기 디스크용 픽업장치.According to claim 1, wherein the micro PBS block 100 is a surface (100-a) for transmitting the P-wave-coated beam incident P-reflection and S-waves reflected, b-side for the anti-reflective coating incident light transmission 5 divided into (100-b), c plane (100-c) and d plane (100-d), and converting P waves incident on the b plane (100-b) into electrical signals and outputting them. Photodiode A (PD1) is divided into 5 and the photodiode combined micro-diode comprising a five-segment photodiode B (PD2) for converting and outputting the S wave incident on the d plane (100-d) into an electrical signal Pick-up device for magneto-optical disk using PBS block. 제2항에 있어서, 상기 5분할 포토다이오드(PD1)와 5분할 포토다이오드B(PD2)는 포커스 에러 시그날과 RF시그날을 검출하기 위한 3개의 세그먼트(A,B,C)와 트랙킹 서보 시그날을 검출하기 위한 2개의 세그먼트(E,F)로 5분할 구성된 것을 특징으로 하는 포토다이오드가 결합된 마이크로 피비에스(PBS)블럭을 사용한 광자기 디스크용 픽업장치.3. The splitting photodiode PD1 and the splitting photodiode B PD2 detect three focus signals A, B and C and a tracking servo signal for detecting a focus error signal and an RF signal. Picking device for a magneto-optical disk using a microdiodes (PBS) block coupled to a photodiode, characterized in that divided into two segments (E, F) for. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940013130A 1994-06-10 1994-06-10 Optical pick-up apparatus KR970004211B1 (en)

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Application Number Priority Date Filing Date Title
KR1019940013130A KR970004211B1 (en) 1994-06-10 1994-06-10 Optical pick-up apparatus

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Application Number Priority Date Filing Date Title
KR1019940013130A KR970004211B1 (en) 1994-06-10 1994-06-10 Optical pick-up apparatus

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KR960002194A true KR960002194A (en) 1996-01-26
KR970004211B1 KR970004211B1 (en) 1997-03-26

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KR100657726B1 (en) * 2004-12-15 2006-12-14 주식회사 대우일렉트로닉스 Servo device of the holographic rom reading system

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