KR910001672A - 반도체 레이저 광학 헤드 어셈블리 - Google Patents

반도체 레이저 광학 헤드 어셈블리 Download PDF

Info

Publication number
KR910001672A
KR910001672A KR1019900008357A KR900008357A KR910001672A KR 910001672 A KR910001672 A KR 910001672A KR 1019900008357 A KR1019900008357 A KR 1019900008357A KR 900008357 A KR900008357 A KR 900008357A KR 910001672 A KR910001672 A KR 910001672A
Authority
KR
South Korea
Prior art keywords
laser beam
optical head
transparent plate
reflected
head according
Prior art date
Application number
KR1019900008357A
Other languages
English (en)
Inventor
리 와시-혼
Original Assignee
원본미기재
펜콤 인터내셔날 코오포레이션
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23424787&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=KR910001672(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 원본미기재, 펜콤 인터내셔날 코오포레이션 filed Critical 원본미기재
Publication of KR910001672A publication Critical patent/KR910001672A/ko

Links

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
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/094—Methods and circuits for servo offset compensation
    • 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
    • G11B7/123—Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
    • 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
    • G11B7/1372—Lenses
    • G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G11B7/0903—Multi-beam tracking systems
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0909—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by astigmatic methods

Abstract

내용 없음

Description

반도체 레이저 광학 헤드 어셈블리
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제8도는 본 발명의 실시예의 다이아그램,
제9도는 제1평면도의 회절격자구조와 제2평면상의 홀로그램 렌즈구조를 갖는 본발명의 바림직한 실시예에서 사용되는 유리판의 평면도,
제10도는 제9도에 유리판의 측면도.

Claims (23)

  1. a) 반사되는 매질에로 전방빔경로를 따라서 이동하며, 반사되는 매질에서 반사되며, 반환경로를 계속되는 레이저빔을 방사하기 위한 반도체 레이저; b) 레이저빔이 반사되는 매질로 부터 반사된 후에 레이저 빔을 검출하기 위한 반환경로를 따라서 배치된 광검출기; 및 c) 전방 및 반환빔경로를 따라서 배치되며 ⅰ) 빔경로에 경사져 위치하며, 제1 및 제2표면을 가지는 투명판 ⅱ) 홀로그램 렌즈구조를 포함하는 홀로그램렌즈 어셈블리로 구성이 되며, 상기 투명판은 전방빔경로상에서 레이저빔에의 빔수차를 정정하여, 상기 홀로그램렌즈는 반환경로상에서 레이저빔을 광검출기상으로 회절시키고, 상기 투명판과 상기 홀로그램렌즈는 반환 경로상에서 회절된 레이저빔에 빔수치를 더하는 것을 특징으로하는 반사되는 매질상에 기록된 정보를 판독하기 위한 광학헤드.
  2. 제1항에 있어서, 상기 투명판이 유리로 구성되는 것을 특징으로 하는 광학헤드.
  3. 제1항에 있어서 홀로그램렌즈 어셈블리가 제2투명판의 표면상에 배치되는 홀로그램렌즈 구조를 가지는 표면을 가지는 제2투명판을 포함하는 것을 특징으로 하는 광학헤드.
  4. 제1항에 있어서, 레이저빔에 정정된 빔수차가 비점수차를 포함을 것을 특징으로 하는 광학헤드.
  5. 제1항에 있어서, 레이저빔에 더해진 빔수차가 비점수차를 포함하는 것을 특징으로 하는 광학헤드.
  6. 제1항에 있어서, 광검출기가 사분(quadrant) 검출기인 것을 특징으로 하는 광학헤드.
  7. 제1항에 있어서, 홀로그램렌즈 어셈블리가 회절격자를 더 포함하는 것을 특징으로 하는 광학헤드.
  8. 제7항에 있어서, 광검출기가 8조각 광검출기인 것을 특징으로 하는 광학헤드.
  9. 제1항에 있어서 레이저빔을 매질상에 초점을 마추기 위한 대물렌즈로 더 구성되는 것을 특징으로 하는 과학헤드.
  10. 제9항에 있어서, 전방경로상에서 반도체 레이저로부터 대물렌즈까지 그리고 반환경로상에서 반사되는 매질로부터 광검출기까지 레이저빔을 반사시키기 위한 거울을 더 포함하는 것을 특징으로 하는 광학헤드.
  11. a) 반사되는 매질에로 전방빔경로를 따라서 이동하며, 반사되는 매질에서 반사되며, 반환경로를 계속되는 레이저빔을 방사하기 위한 반도체 레이저; b) 레이저빔이 반사되는 매질로 부터 반사된 후에 레이저빔을 검출하기 위한 반환경로를 따라서 배치된 광검출기; 및 c) 전방 및 반환빔경로를 따라서 배치되며 ⅰ) j 및 빔경로에 경사져 위치하며, 제1 및 제2표면을 가지는 투명판 ⅱ) 레이저빔을 다수의 빔으로 회절시키기 위한 제1홀로 그램 렌즈구조 ⅲ) 레이저빔을 다수의 빔으로 회절시키기 위한 제2홀로 그램 구조를 포함하는 홀로그램렌즈 어셈블리로 구성이되며 상기 제1홀로그램렌즈 구조는 전방빔경로상에서 레이저빔을 다수의 빔으로 회절하고 투명판은 전방빔경로상에서 레이저빔에 빔수차를 정정하며, 제2홀로그램렌즈 구조는 반환빔경로상에서 레이저빔을 광검출기상으로 회절하며 그리고 투명판과 제2홀로그램렌즈 구조는 반환빔경로상에서 회절된 레이저빔에 빔수차를 더하는 것을 특징으로 하는 반사되는 매질상에 기록된 정보를 판독하기 위한 광학헤드.
  12. 제11항에 있어서, 제1홀로그램렌즈 구조가 회절격자구조인 것을 특징으로 하는 광학헤드.
  13. 제12항에 있어서, 제2홀로그램렌즈 구조가 반환경로상의 레이저빔을 회절하는 회절격자 구조에 대하여 광검출기상에 회절격자 주위로 위치하게 하는 것을 특징으로 하는 과학헤드.
  14. 제12항에 있어서, 투명판이 유리로 구성되는 것을 특징으로 하는 광학헤드.
  15. 제12항에 있어서, 홀로그램렌즈 어셈블리가 표면을 가지는 제2투명판을 더 포함하며, 제2홀로그램렌즈 어셈블리는 제2투명판의 배치되는 것을 특징으로 하는 과학헤드.
  16. 제11항에 있어서, 투명판들이 서로에 평행하는 것을 특징으로 하는 광학헤드.
  17. 제15항에 있어서, 투명판들이 서로에 평행하지 않는 것을 특징으로 하는 광학헤드.
  18. 제12항에 있어서, 레이저빔에 정정되는 빔수차가 비점수차를 포함하는 것을 특징으로 하는 광학헤드.
  19. 제12항에 있어서, 레이저빔에 더해지는 빔수차가 비점수차를 포함하는 것을 특징으로 하는 광학헤드.
  20. 제12항에 있어서, 8항과 동일.
  21. 제12항에 있어서, 9항과 동일.
  22. 제21항에 있어서, 10항과 동일.
  23. a) 제1 및 제2표면을 가지는 적어도 하나의 투명판; b) 투명판들 중의 하나의 표면상에 배치되며, 레이저빔을 3기본빔으로 회절하기에 적합한 격자구조; 및 c) 투명판들 중의 하나의 표면상에 배치되며, 격자구조 주위로 레이저빔을 회절시키기 위해 적합한 홀로그램 렌즈;로 구성되는 홀로그램렌즈 어셈블리.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019900008357A 1989-06-06 1990-06-07 반도체 레이저 광학 헤드 어셈블리 KR910001672A (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US362124 1989-06-06
US07/362,124 US5050153A (en) 1989-06-06 1989-06-06 Semiconductor laser optical head assembly

Publications (1)

Publication Number Publication Date
KR910001672A true KR910001672A (ko) 1991-01-31

Family

ID=23424787

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019900008357A KR910001672A (ko) 1989-06-06 1990-06-07 반도체 레이저 광학 헤드 어셈블리

Country Status (5)

Country Link
US (1) US5050153A (ko)
EP (1) EP0401764A3 (ko)
JP (1) JP2651419B2 (ko)
KR (1) KR910001672A (ko)
CA (1) CA2018313A1 (ko)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3117211B2 (ja) * 1990-05-31 2000-12-11 オリンパス光学工業株式会社 光学ヘッド
US5202875A (en) * 1991-06-04 1993-04-13 International Business Machines Corporation Multiple data surface optical data storage system
JPH0695038A (ja) * 1992-03-19 1994-04-08 Matsushita Electric Ind Co Ltd 超解像走査光学装置、光学装置の超解像用光源装置及び光学装置の超解像用フィルター
US5486923A (en) * 1992-05-05 1996-01-23 Microe Apparatus for detecting relative movement wherein a detecting means is positioned in the region of natural interference
ATE182677T1 (de) * 1992-05-05 1999-08-15 Microe Inc Apparat zum detektieren einer relativen bewegung
EP0981063A3 (en) * 1992-07-14 2003-09-17 Seiko Epson Corporation Polarizer, optical element, and optical head
DE4301827A1 (de) * 1993-01-23 1994-07-28 Thomson Brandt Gmbh Eliminieren von Abtaststörungen
KR970000645B1 (ko) * 1994-02-26 1997-01-16 엘지전자 주식회사 광픽업 시스템
US5511059A (en) * 1994-06-14 1996-04-23 Eastman Kodak Company Multi-element grating beam splitter with a reflection grating element for use in front facet substraction
US5544143A (en) * 1994-06-14 1996-08-06 Eastman Kodak Company Read/write laser-detector-grating unit (LDGU) with an orthogonally-arranged focus and tracking sensor system
US5565674A (en) * 1994-09-13 1996-10-15 Eastman Kodak Company Optical detection and signal conditioning package
US5787058A (en) * 1995-05-31 1998-07-28 Daewoo Electronics Co., Ltd. Optical pickup apparatus utilizing a polygonal prism
JPH09259458A (ja) * 1996-03-22 1997-10-03 Sony Corp 光学装置及びこの光学装置を用いた光ピックアップ装置
US5696749A (en) * 1996-06-28 1997-12-09 Eastman Kodak Company Dual-wavelength optical recording head utilizing grating beam splitter and integrated laser and detectors
US5710753A (en) * 1996-06-28 1998-01-20 Eastman Kodak Company Multi-element grating beam splitter using double refraction to reduce optical feedback and associated light source noise
US5689492A (en) * 1996-08-06 1997-11-18 Eastman Kodak Company Assembly used for precisely positioning the component parts of a laser detector grating unit (LDGU)
US5710672A (en) * 1996-09-30 1998-01-20 Eastman Kodak Company Assembly for positioning the component parts of a laser detector grating unit (LDGU)
DE19645150C2 (de) * 1996-10-28 2002-10-24 Fraunhofer Ges Forschung Optische Anordnung zur Symmetrierung der Strahlung von Laserdioden
US5856961A (en) * 1997-06-24 1999-01-05 Eastman Kodak Company Laser detector grating unit (LDGU) for producing focus error, a push-pull tracking error, and differential phase tracking error signals
US5991249A (en) * 1997-07-29 1999-11-23 Hoetron, Inc. Optical track sensing device
JP2002025096A (ja) * 2000-07-07 2002-01-25 Matsushita Electric Ind Co Ltd 半導体光源、光ピックアップヘッド装置及び情報記録再生装置
JP2002163830A (ja) * 2000-11-24 2002-06-07 Toshiba Corp 光学的収差を利用した光情報処理システムおよび厚みムラのある透明層で保護された記録層を持つ情報媒体
DE10062078A1 (de) * 2000-12-13 2002-06-20 Thomson Brandt Gmbh Verfahren zum Erzeugen eines Linsenpositionssignals sowie entsprechendes Gerät zum Lesen und/oder Beschreiben eines optischen Aufzeichnungsträgers
US6723980B2 (en) 2001-07-16 2004-04-20 Wai-Hon Lee Position sensor with grating to detect moving object with periodic pattern
KR100403597B1 (ko) * 2001-08-30 2003-10-30 삼성전자주식회사 홀로그램이 형성된 빔스프리터를 구비하는 광픽업장치 및이를 이용한 광축보정방법
JP2003163405A (ja) * 2001-11-26 2003-06-06 Sony Corp ２波長半導体レーザ素子およびそれに用いられる非点補正板ならびにその配置方法
DE602004026372D1 (de) 2003-01-29 2010-05-12 Ricoh Kk Optische Lesekopfvorrichtung und optisches Plattengerät
KR100574050B1 (ko) * 2003-05-03 2006-04-27 삼성전자주식회사 홀로그램 정보저장장치용 서보 컨트롤
JP2005025897A (ja) * 2003-07-04 2005-01-27 Victor Co Of Japan Ltd 光ピックアップ装置
CA2534894C (en) 2003-08-11 2020-01-21 Kweek-En Researchbedrijf Agrico B.V. Fungus resistant plants and their uses
US8606626B1 (en) 2007-01-31 2013-12-10 Experian Information Solutions, Inc. Systems and methods for providing a direct marketing campaign planning environment
JP5178107B2 (ja) 2007-09-14 2013-04-10 オリンパス株式会社 レーザー走査型顕微鏡
US9057508B1 (en) 2014-10-22 2015-06-16 Codeshelf Modular hanging lasers to enable real-time control in a distribution center
US9327397B1 (en) 2015-04-09 2016-05-03 Codeshelf Telepresence based inventory pick and place operations through robotic arms affixed to each row of a shelf
US9262741B1 (en) 2015-04-28 2016-02-16 Codeshelf Continuous barcode tape based inventory location tracking
US11579014B1 (en) * 2020-08-20 2023-02-14 Amazon Technologies, Inc. Optical detector system

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53121644A (en) * 1977-03-31 1978-10-24 Olympus Optical Co Ltd Detecting method of focal position using holograph
JPS5545074A (en) * 1978-09-28 1980-03-29 Ricoh Co Ltd Hologram lens
JPS5647933A (en) * 1979-09-25 1981-04-30 Sony Corp Optical signal head
JPS61195533U (ko) * 1985-05-29 1986-12-05
JPS61203427U (ko) * 1985-06-12 1986-12-20
JPS62139145A (ja) * 1985-12-11 1987-06-22 Fujitsu Ltd 光ピツクアツプ
FR2597249B1 (fr) * 1986-04-11 1988-06-17 Thomson Csf Dispositif de lecture optique de support d'enregistrement optique
US4794585A (en) * 1986-05-06 1988-12-27 Lee Wai Hon Optical head having a hologram lens and polarizers for use with magneto-optic medium
US4879706A (en) * 1987-07-29 1989-11-07 Laser Magnetic Storage International Company Method and apparatus for focus and tracking in an optical disk system
JPS6455746A (en) * 1987-08-26 1989-03-02 Sharp Kk Optical pickup device
DE3855936T2 (de) * 1987-08-24 1998-01-02 Sharp Kk Optische Abtastvorrichtung
US4776652A (en) * 1987-10-01 1988-10-11 Camber Corporation Optical head having two holographic optical elements, with one element inclined relative to the other
FR2639460B1 (fr) * 1988-11-21 1993-05-21 Ricoh Kk Appareil d'enregistrement/reproduction optique

Also Published As

Publication number Publication date
CA2018313A1 (en) 1990-12-06
US5050153A (en) 1991-09-17
JPH04117635A (ja) 1992-04-17
EP0401764A3 (en) 1992-03-04
EP0401764A2 (en) 1990-12-12
JP2651419B2 (ja) 1997-09-10

Similar Documents

Publication Publication Date Title
KR910001672A (ko) 반도체 레이저 광학 헤드 어셈블리
US4665310A (en) Apparatus for optically scanning an information plane wherein a diffraction grating splits the beam into two sub-beams
KR950034115A (ko) 광 픽업
KR870011588A (ko) 개량된 광헤드
KR970002939A (ko) 3분할용 회절 격자, 투과형 홀로그램 소자 및 그것을 이용한 광 픽업 장치
KR870002557A (ko) 자동초점 제어 방식
KR880003294A (ko) 광학식 재생 장치
KR940000419B1 (ko) 광학정보기록재생용 광헤드
EP0463295B1 (en) Optical pickup head
EP0379363A3 (en) Optical head device for use in optical disk system
KR920022229A (ko) 광픽업
KR920003272A (ko) 광학헤드 및 광학 메모리 장치
KR950030064A (ko) 광픽업장치
US5360970A (en) Apparatus and method for a single return path signal sensor system
US5856961A (en) Laser detector grating unit (LDGU) for producing focus error, a push-pull tracking error, and differential phase tracking error signals
KR960019125A (ko) 다층 디스크용 광 픽업
US5007713A (en) Beam converting apparatus with a parallel light beam input and output from one prism plane
KR970017245A (ko) 듀얼 포커스 광 픽업장치
KR950034116A (ko) 광 픽업
KR860008532A (ko) 광학식 헤드의 트랙킹 오차 검출장치
KR930009680B1 (ko) 광기록 재생장치의 주사방법 및 장치
KR950034117A (ko) 광 픽업
KR930002127Y1 (ko) 광디스크시스템의 광 헤드 장치
KR860008531A (ko) 광학식 헤드의 트랙킹 오차 검출장치
KR860001418A (ko) 광학식 헤드의 트랙킹 오차 검출장치

Legal Events

Date Code Title Description
WITN Application deemed withdrawn, e.g. because no request for examination was filed or no examination fee was paid