KR870010501A - Optical head unit - Google Patents

Optical head unit Download PDF

Info

Publication number
KR870010501A
KR870010501A KR870003437A KR870003437A KR870010501A KR 870010501 A KR870010501 A KR 870010501A KR 870003437 A KR870003437 A KR 870003437A KR 870003437 A KR870003437 A KR 870003437A KR 870010501 A KR870010501 A KR 870010501A
Authority
KR
South Korea
Prior art keywords
light
optical
order
diffracted
beam splitter
Prior art date
Application number
KR870003437A
Other languages
Korean (ko)
Other versions
KR900008404B1 (en
Inventor
신스게 시가마
Original Assignee
시기 모리야
미쓰비시덴기 가부시기가이샤
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
Application filed by 시기 모리야, 미쓰비시덴기 가부시기가이샤 filed Critical 시기 모리야
Publication of KR870010501A publication Critical patent/KR870010501A/en
Application granted granted Critical
Publication of KR900008404B1 publication Critical patent/KR900008404B1/en

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353Diffractive elements, e.g. holograms or gratings
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

내용 없음No content

Description

광학식 헤드 장치Optical head unit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 1실시예에 의한 광학식 헤드 장치를 도시하는 개략 구성도.1 is a schematic block diagram showing an optical head device according to an embodiment of the present invention.

제3도는 광 디스크 상의 광 스포트도.3 is an optical spot view on an optical disc.

제4도는 광 검지기의 결선도.4 is a wiring diagram of a light detector.

Claims (7)

0차 회절광과 그 이외의 회절광의 여러줄의 광속으로 회절분리한 광원에서의 발사광속을 제1의 면에 받는 빔 스플리터와 상기 빔 스플리터에 의해서 반사된 광속을 록학식 정보 기억매체상에 여러개의 광스포트로서 집광하는 집광 렌즈수단과, 상기 광학식 정보 기억매체의 정보면에 의해서 반사되어 상기 집광렌즈 수단을 재투과하고, 상기 빔 스플리터의 제1의 면 및 제2의 면을 투과한 광속을 수광하여 광전 변환하는 광검지기에 의해 구성되어, 상기 광 검지기상의 0차 회절광의 변형에 의해서 디스크 집광광속의 초점 어긋남을 검지하여, 0차 회절광에 의해 광학식 정보 기억매체에 축적된 정보를 재생하고, 0차 이외의 회절광에 의해 상기 광학식 정보 기억 매체상의 정보 트랙과 0차 회절광의 집광 스포트와의 면내 어긋남을 검출하는 광학식 헤드 장치에 있어서, 상기 빔 스플리터의 제1의 면에 상기 광원에서의 발사광속을 0차 회절광과 그 이외의 회절광의 여러줄의 광속으로 회절분리하는 회절격자의 기능을 갖것한 것을 특징으로 하는 광학식 헤드 장치.The beam splitter receiving the emission light beam from the light source diffracted into the light beam diffracted into the multi-beam beams of the 0th order diffracted light and other diffracted light on the first surface and the light beam reflected by the beam splitter on the lock information storage medium Condensing lens means for condensing as an optical spot of light and a light beam reflected by the information surface of the optical information storage medium and retransmitting the condensing lens means, and passing through the first and second surfaces of the beam splitter; A photodetector for receiving and photoelectrically converting to detect focus shift of the disk condensing beam by deformation of the zero-order diffraction light on the photodetector to reproduce information accumulated in the optical information storage medium by the zero-order diffraction light. Optical head for detecting in-plane misalignment between the information track on the optical information storage medium and the condensing spot of the 0th order diffracted light by means of diffracted light other than the 0th order Wherein the first surface of the beam splitter has a function of a diffraction grating which diffracts the emitted light beam from the light source into light beams of zero-order diffracted light and other lines of diffracted light. Head device. 상기 빔 스플리터에 의해서 회절분리되는 광속의 수가 3개인 것을 특징으로 하는 특허청구의 범위 제1항 기재의 광학식 헤드 장치.The optical head device according to claim 1, wherein the number of light beams diffracted and separated by the beam splitter is three. 상기 광학식 정보 기억매체에 의해서 반사한 광속이, 상기 빔 스플리터의 제1의 면 및 제2의면을 투과하는 것에 의해서 비점수차가 부여되어, 상기 0차광에 의한 초점 어긋남 검출을 위한 변형이 부여되는 것을 특징으로 하는 특허청구의 범위 제1항 기재의 광학식 헤드 장치.The astigmatism is imparted by the light beam reflected by the optical information storage medium passing through the first and second surfaces of the beam splitter, and the deformation for focus detection due to the zero-order light is provided. The optical head device of Claim 1 characterized by the claim. 상기 빔 스플리터의 제1의 면과 제2의 면이 평행인 것을 특징으로 하는 특허청구의 범위 제3항기재의 광학식 헤드 장치.The optical head device according to claim 3, wherein the first and second surfaces of the beam splitter are parallel to each other. 상기 빔 스플리터의 제1의 면과 제2의 면이 쐐기상태인 것을 특징으로 하는 특허청구의 범위 제3항 기재의 광학식 헤드 장치.The optical head device according to claim 3, wherein the first and second surfaces of the beam splitter are in a wedge state. 상기 광 검지기의 상기 0차광을 수광하는 부분이 4분할되어 있어, 비점수차를 부여된 광속의 최소착락원 위치에 놓인 4분할 검지기의 대각부분에서 각각 수광되는 것을 특징으로 하는 특허청구의 범위 제3항기재의 광학식 헤드 장치.The third part of the claim, characterized in that the light receiving portion of the light detector is divided into four portions, and the light receiving portions are received at diagonal portions of the four-segment detector placed at the minimum landing point of the luminous flux given astigmatism. Airborne optical head unit. 상기 광학식 정보 기억매체상에 집광된 0차의 광속이 초점이 합쳐진 상태로 있을 때에, 상기 비점수차를 부여된 0차광에 대응하는 반사광속의 최소 착락원의 위치에 광 검지기가 배치되어 있는 것을 특징으로 하는 특허청구의 범위 제3항 기재의 광학식 헤드 장치.An optical detector is arranged at a position of a minimum landing source of the reflected light beam corresponding to the zero-order light with the astigmatism when the zero-order light beam focused on the optical information storage medium is in focus; The optical head device according to claim 3 to claim. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019870003437A 1986-04-18 1987-04-10 Optical head apparatus KR900008404B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP89601 1986-04-18
JP61089601A JPS62246148A (en) 1986-04-18 1986-04-18 Optical head device
JP61-89601 1986-04-18

Publications (2)

Publication Number Publication Date
KR870010501A true KR870010501A (en) 1987-11-30
KR900008404B1 KR900008404B1 (en) 1990-11-20

Family

ID=13975283

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019870003437A KR900008404B1 (en) 1986-04-18 1987-04-10 Optical head apparatus

Country Status (2)

Country Link
JP (1) JPS62246148A (en)
KR (1) KR900008404B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2702178B2 (en) * 1988-09-28 1998-01-21 三菱電機株式会社 Optical head device

Also Published As

Publication number Publication date
KR900008404B1 (en) 1990-11-20
JPS62246148A (en) 1987-10-27

Similar Documents

Publication Publication Date Title
KR950008949B1 (en) Appara for optically scanning an information plane wherein a diffraction grating the beam into two sub beam
KR930000039B1 (en) Optical pick-up device
US5016954A (en) Optical pickup and hologram therefor
KR950034115A (en) Optical pickup
KR940012281A (en) Optical pickup head device
KR880002149A (en) Optical head unit
KR910001672A (en) Semiconductor laser optical head assembly
KR940000419B1 (en) Optical head
KR840005877A (en) Optical playback device
KR920022229A (en) Optical pickup
KR910020663A (en) Optical head
KR950030064A (en) Optical pickup device
KR100213270B1 (en) Optical pickup for use with a double-sided disk
US5570334A (en) Optical pickup with a double refraction polarizing plate to split light beams into two polarized beams
KR870010501A (en) Optical head unit
KR950034116A (en) Optical pickup
KR910020667A (en) Optical head unit
KR0155092B1 (en) Optical pick up system
KR880003298A (en) Optical head unit
JP2763174B2 (en) Optical pickup device
KR880000926A (en) Optical head unit
KR0144874B1 (en) Optical pick-up device
KR880003299A (en) Optical head unit
KR970012401A (en) Optical pickup for high density recording and playback
KR200172921Y1 (en) Optical pick-up apparatus by employing hologram optic element

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20051111

Year of fee payment: 16

LAPS Lapse due to unpaid annual fee