KR940022426A - Optical head - Google Patents

Optical head Download PDF

Info

Publication number
KR940022426A
KR940022426A KR1019930004918A KR930004918A KR940022426A KR 940022426 A KR940022426 A KR 940022426A KR 1019930004918 A KR1019930004918 A KR 1019930004918A KR 930004918 A KR930004918 A KR 930004918A KR 940022426 A KR940022426 A KR 940022426A
Authority
KR
South Korea
Prior art keywords
optical head
wave plate
laser diode
path
collimating lens
Prior art date
Application number
KR1019930004918A
Other languages
Korean (ko)
Other versions
KR0135859B1 (en
Inventor
신현국
Original Assignee
김광호
삼성전자 주식회사
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 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019930004918A priority Critical patent/KR0135859B1/en
Publication of KR940022426A publication Critical patent/KR940022426A/en
Application granted granted Critical
Publication of KR0135859B1 publication Critical patent/KR0135859B1/en

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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers

Abstract

본 발명은 기록 매체인 메디아에 수록된 신호를 광학적으로 읽고 쓰는 광헤드의 관한 것으로서, 상세하게는 포커싱 오차신호 및 트랙킹 신호의 검출을 위한 구조가 개선된 광헤드에 관한 것이다. 본 발명 광헤드는 레이저 다이오드와 대물렌즈사이의 광경로상에 마련되어 통과빔을 평행광으로 변형하는 콜리메이팅 렌즈, 상기 콜리메이팅 렌즈와 상기 레이저 다이오드의 사이에 마련되어 디스크로부터 반사된 빔을 일방향으로 반사하는 빔스플리터, 상기 빔스플리터로부터의 반사된 빔의 진행경로상에 위치되는 반파장판, 상기 반파장판을 통과한 하나의 빔을 적어도 두개의 나란한 경로상의 빔으로 분리하는 소정경사각의 양 반사면을 갖는 편광프리즘을 구비한다. 본 발명에 따르면, 따라서, 전체의 소형 경량화가 가능하게 되며, 이로 인해 조립성이 향상될 뿐아니라 그 제조단가에 있어서 종래의 어느 것에 비해 유리하게 된다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head that optically reads and writes a signal recorded on a media, which is a recording medium, and more particularly, to an optical head having an improved structure for detecting a focusing error signal and a tracking signal. Optical head of the present invention is provided on the optical path between the laser diode and the objective lens collimating lens for transforming the passing beam into parallel light, provided between the collimating lens and the laser diode to reflect the beam reflected from the disk in one direction A beam splitter, a half-wave plate positioned on a path of the reflected beam from the beam splitter, and a reflective surface having a predetermined inclination angle for separating one beam passing through the half-wave plate into beams on at least two parallel paths. It has a polarizing prism. According to the present invention, therefore, it is possible to reduce the overall size and weight, which not only improves the assemblability but also provides advantages over conventional ones in manufacturing cost thereof.

Description

광헤드Optical head

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

제4도는 본 발명에 따른 광헤드의 구성도,4 is a block diagram of an optical head according to the present invention,

제5도는 본 발명에 적용되는 광검출기의 패턴도,5 is a pattern diagram of a photodetector applied to the present invention,

제5도는 본 발명 광헤드에 적용되는 광검출기의 패턴도,5 is a pattern diagram of a photodetector applied to the optical head of the present invention.

제6도 내지 제8도는 본 발명 광헤드에 있어서, 디스크에 대한 레이저 빔의 포커스 상태에 따른 광검출기에 대한 빔의 집속상태의 변화를 보이는 측면도,6 to 8 are side views showing a change in the focused state of the beam for the photodetector according to the focus state of the laser beam with respect to the disk in the optical head of the present invention;

제9도는 본 발명 광헤드에 적용되는 광헤드의 광검출기의 패턴도로서, 레이저 빔의 촛점상태를 보인 정면도이다.9 is a pattern diagram of the photodetector of the optical head applied to the optical head of the present invention, and is a front view showing a focused state of the laser beam.

Claims (5)

광자기 디스크에 대면하는 대물렌즈, 대물렌즈를 통해 상기 디스크에 레이저 빔을 조사하는 레이저 다이오드, 상기 레이저 다이오드와 대물렌즈사이의 광경로상에 마련되어 통과빔을 평행광으로 변형으로 콜리메이팅 렌즈, 상기 콜리메이팅 렌즈와 상기 레이저 다이오드의 사이에 마련되어 디스크로부터 반사된 빔을 일방향으로 반사하는 빔스플리터, 상기 빔스플리터로부터의 반사된 빔의 진행 경로상에 위치되는 반파장판, 상기 반파장판을 통과한 하나의 빔을 적어도 두개의 나란한 경로상의 빔으로 분리하는 소정경사각의 양 반사면을 갖는 편광프로즘, 상기 편광프리즘으로부터의 광진행 경로상에 마련되는 적어도 두 개 요소의 광검지부를 갖는 광검출기를 구비하는 것을 특징으로 하는 광헤드.An objective lens facing a magneto-optical disk, a laser diode for irradiating a laser beam to the disk through an objective lens, a collimating lens provided on the optical path between the laser diode and the objective lens by transforming a passing beam into parallel light, and A beam splitter provided between the collimating lens and the laser diode to reflect the beam reflected from the disk in one direction, a half-wave plate positioned on the path of travel of the reflected beam from the beam splitter, and one passed through the half-wave plate A polarization prism having both reflecting surfaces of a predetermined inclination angle separating the beam into beams on at least two parallel paths, and having a photodetector having at least two element photodetectors provided on the light propagation path from the polarization prism; An optical head, characterized in that. 제1항에 있어서, 상기 편광프리즘의 양반사막은 입사 광진행 경로에 대해 45도 경사지게 마련된 것을 특징으로 하는 광헤드.The optical head according to claim 1, wherein the reflective film of the polarizing prism is inclined at 45 degrees with respect to the incident light traveling path. 제1항 또는 제2항에 있어서, 상기 콜리메이팅 렌즈와 반파장판, 편광프리즘이 하나의 구조체를 이루도록 상호 결합된 것을 특징으로 하는 광헤드.The optical head according to claim 1 or 2, wherein the collimating lens, the half-wave plate, and the polarizing prism are coupled to each other to form a structure. 제3항에 잇어서, 상기 광검출기는 3개의 나란한 스트라이프상의 광검지 요소를 가지는 것을 특징으로 하는 광헤드.4. An optical head according to claim 3, wherein the photodetector has three side by side striped photodetecting elements. 제1항 또는 제2항에 있어서, 상기 광검출기의 각 요소는 적어도 3개의 나란한 스트라이프상의 검지부를 가지는 것을 특징으로 하는 광헤드.The optical head according to claim 1 or 2, wherein each element of the photodetector has at least three parallel stripe-shaped detection units. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930004918A 1993-03-27 1993-03-27 Optical head KR0135859B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930004918A KR0135859B1 (en) 1993-03-27 1993-03-27 Optical head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930004918A KR0135859B1 (en) 1993-03-27 1993-03-27 Optical head

Publications (2)

Publication Number Publication Date
KR940022426A true KR940022426A (en) 1994-10-20
KR0135859B1 KR0135859B1 (en) 1998-05-15

Family

ID=19352912

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930004918A KR0135859B1 (en) 1993-03-27 1993-03-27 Optical head

Country Status (1)

Country Link
KR (1) KR0135859B1 (en)

Also Published As

Publication number Publication date
KR0135859B1 (en) 1998-05-15

Similar Documents

Publication Publication Date Title
JPS6227456B2 (en)
US5726962A (en) Compact optical pickup device with beam splitter
KR19990019448A (en) Optical pickup for recordable and playable discs
KR940006092A (en) Optical information playback device
KR100286865B1 (en) Optical head unit
KR100213270B1 (en) Optical pickup for use with a double-sided disk
KR940020327A (en) Optical head
JPH0478029A (en) Optical information recording and reproducing device
KR100449612B1 (en) Optical pickup and opto-magnetic signal reproducing apparatus
JPH0434740A (en) Optical head
KR950015234A (en) Optical pickup
JPH07121899A (en) Optical pickup device
KR940022426A (en) Optical head
JPH06349104A (en) Optical pickup
JP2857245B2 (en) Optical pickup device
JPH0721866B2 (en) Optical head device
JP2643555B2 (en) Optical information recording / reproducing device
JP2806197B2 (en) Optical pickup
KR960007900B1 (en) Optical pick-up
JP2578203B2 (en) Light head
KR0171077B1 (en) A recording and reproducing optical pickup system for optical disk with plural recording layer in one side by generating successively different polarization beam
JP2888280B2 (en) Optical head device
JP2707361B2 (en) Optical device for optical pickup
JP3393680B2 (en) Optical pickup
JP4072776B2 (en) Optical pick-up module and magneto-optical signal recording / reproducing apparatus

Legal Events

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

Payment date: 20051227

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee