KR960035482A - Optical pickup device capable of multiple focusing - Google Patents

Optical pickup device capable of multiple focusing Download PDF

Info

Publication number
KR960035482A
KR960035482A KR1019950004328A KR19950004328A KR960035482A KR 960035482 A KR960035482 A KR 960035482A KR 1019950004328 A KR1019950004328 A KR 1019950004328A KR 19950004328 A KR19950004328 A KR 19950004328A KR 960035482 A KR960035482 A KR 960035482A
Authority
KR
South Korea
Prior art keywords
disk
reading
separated
beams
wave
Prior art date
Application number
KR1019950004328A
Other languages
Korean (ko)
Other versions
KR0160204B1 (en
Inventor
박성찬
Original Assignee
구자홍
Lg 전자주식회사
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 구자홍, Lg 전자주식회사 filed Critical 구자홍
Priority to KR1019950004328A priority Critical patent/KR0160204B1/en
Priority to US08/579,143 priority patent/US5671207A/en
Priority to JP8007229A priority patent/JPH08249718A/en
Publication of KR960035482A publication Critical patent/KR960035482A/en
Application granted granted Critical
Publication of KR0160204B1 publication Critical patent/KR0160204B1/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
    • G11B7/12—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
    • G11B7/139—Numerical aperture control means
    • 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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • 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
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • 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
    • 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
    • G11B7/1376—Collimator lenses
    • 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

Abstract

본 발명은 다중 포커싱이 가능한 광픽업장치에 관한 것으로서, 종래 CD와 고밀도용 디스크를 동시에 읽을 수 없었던 문제점을 해결하기 위해 선형 편광된 레이저 빔을 주사하는 레이저 다이오드와, 레이저 다이오드에서 주사된 레이저 빔을 메인빔과 서브빔으로 만드는 회절격자와, 회절격자를 통한 빔을 평행빔으로 만드는 시준렌즈와, 시준렌즈를 통한 평행빔을 두께가 서로 상이한 제1 및 제2디스크를 동시에 읽기 위한 빔으로 분리하는 제1빔 분리수단과, 제1빔 분리수단을 통해 분리된 빔을 두께가 서로 상이한 제1및 제2디스크에 집광시키는 대물렌즈와, 두께가 서로 상이한 제1 및 제2디스크로부터 반사된 빔들을 분리하는 제2빔 분리수단과, 제2빔 분리수단에 의해 분리된 빔을 검출하여 디스크 종류의 판단을 위한 전기적 신호로 출력하는 광검출수단으로 구성된 광픽업장치를 제공함으로 CD-ROM, MD, MODD등에서 적용할 수가 있다.The present invention relates to an optical pickup apparatus capable of multiple focusing, comprising a laser diode scanning a linearly polarized laser beam and a laser beam scanned from the laser diode in order to solve the problem that a conventional CD and a high-density disk cannot be read simultaneously. A diffraction grating made of a main beam and a sub beam, a collimating lens making a beam through the diffraction grating into parallel beams, and a parallel beam through the collimating lens are separated into beams for simultaneously reading first and second discs having different thicknesses. The first beam separating means, the objective lens for condensing the beam separated by the first beam separating means on the first and second disks having different thicknesses, and the beams reflected from the first and second disks having different thicknesses The second beam separation means for separating and the light detection number for detecting the beam separated by the second beam separation means and outputting as an electrical signal for the disc type determination It can be applied to CD-ROM, MD, MODD etc. by providing optical pickup device composed of stages.

Description

다중 포커싱이 가능한 광픽업장치Optical pickup device capable of multiple focusing

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

제6도는 본 발명 다중 포커싱이 가능한 광픽업장치의 구성도, 제7도는 제6도에서 제1빔 분리수단의 상세구성도, 제8도의 (가)와 (나)는 입사빔 크기에 의한 개구수 변화로 디스크에 촛점이 맺히는 상태도.6 is a configuration diagram of an optical pickup apparatus capable of multiple focusing according to the present invention, FIG. 7 is a detailed configuration diagram of the first beam separating means in FIG. 6, and (a) and (b) of FIG. The state that the disk focuses on the number change.

Claims (5)

선형 편광된 레이저 빔을 주사하는 레이저 다이오드(11)와, 상기 레이저 다이오드(11)에서 주사된 레이저빔을 메인빔과 서브빔으로 만드는 회절격자(12)와, 상기 회절격자(12)를 통한 빔을 평행빔으로 만드는 시준렌즈(13)와, 상기 시준렌즈(13)를 통한 평행빔을 두께가 서로 상이한 제1 및 제2디스크(36,37)를 동시에 읽기 위한 빔으로 분리하는 제1빔 분리수단(20)과, 상기 제1빔 분리수단(20)을 통해 분리된 빔을 상기 두께가 서로 상이한 제1 및 제2디스크(36,37)에 집광시키는 대물렌즈(35)와, 상기 두께가 서로 상이한 제1 및 제2디스크(36,37)로부터 반사된 빔들을 분리하는 제2빔 분리수단(30)과, 상기 제2빔 분리수단(30)에 의해 분리된 빔을 검출하여 디스크 종류의 판단을 위한 전기적 신호로 출력하는 광검출수단(40)으로 구성된 다중 포커싱이 가능한 광픽업장치.A laser diode 11 for scanning a linearly polarized laser beam, a diffraction grating 12 for making the laser beam scanned by the laser diode 11 into a main beam and a sub beam, and a beam through the diffraction grating 12 First beam separation for separating the collimating lens 13 and the parallel beam through the collimating lens 13 into beams for simultaneously reading the first and second disks 36 and 37 having different thicknesses. The objective lens 35 and the objective lens 35 for condensing the beam separated by the first beam separation means 20 to the first and second disks 36 and 37 having different thicknesses; The second beam separation means 30 for separating the beams reflected from the first and second discs 36 and 37 different from each other, and the beam separated by the second beam separation means 30 to detect the type of disc Optical pickup device capable of multiple focusing consisting of a light detection means 40 for outputting an electrical signal for determination. 제1항에 있어서, 상기 제1빔 분리수단(20)은 상기 시준레즈(13)를 통한 평행빔에 포함된 P파와 S파를 두께가 서로 상이한 제1 및 제2디스크(36,37)를 동시에 읽기 위해 투과 및 반사에 의해 분리하는 제1편광빔 분할기(21)와, 상기 제1편광빔 분할기(21)를 통해 분리된 P파를 편광시켜 제1디스크 독취용 빔으로 변환하는 제2플레이트(22)와, 상기 제1편광빔 분할기(21)를 통해 분리된 S파를 편광시켜 제2디스크 독취용 빔으로 변환하는 제3플레이트(23)와, 상기 제2플레이트(22)를 통해 편광된 P파의 반경을 작게하여 상기 제1디스크(36)에 완전 반사하는 제1반사부(24)와, 상기 제3플레이트(23)를 통해 편광된 S파의 반경을 상기 제1반사부(24)에의해 반사된 반경 보다 상대적으로 크게 하여 상기 제2디스크(37)에 완전 반사하는 제2반사부(25)로 구성된 것을 특징으로 하는 다중 포커싱이 가능한 광픽업장치.The method of claim 1, wherein the first beam separation means 20 is used for the first wave and the second disc (36,37) of the P wave and the S wave included in the parallel beam through the collimation legs 13 are different from each other A first polarizing beam splitter 21 which is separated by transmission and reflection for reading at the same time, and a second plate which polarizes the P wave separated by the first polarizing beam splitter 21 and converts it into a first disk reading beam. And a third plate 23 for converting the S-waves separated by the first polarization beam splitter 21 into a second disk reading beam, and polarization through the second plate 22. The radius of the S-wave polarized through the first reflecting portion 24 and the third plate 23 and the first reflecting portion 24 completely reflected on the first disk 36 by reducing the radius of the P wave, the first reflecting portion ( 24, characterized in that it comprises a second reflecting portion 25 which is relatively larger than the radius reflected by the second reflector to the second disk 37 Cushing The optical pickup device as possible. 제1항에 있어서, 상기 제2빔 분리수단(30)은 상기 제1빔 분리수단(20)을 통해 되돌아 오는 빔들을 부분투과(P파) 및 반사(S파)시켜 분리하는 제2편광빔 분할기(31)와 제2편광빔 분할기(31)에서 분리된 빔들을 감지하여 방사하는 센서렌즈(32)와, 상기 센서렌즈(32)를 통해 감지된 빔들에서 제1디스크 독취용 빔과 제2디스크 독취용 빔을 분리하는 제3편광빔 분할기(33)로 구성된 것을 특징으로 하는 다중 포커싱이 가능한 광픽업장치.The second polarization beam of claim 1, wherein the second beam separation means 30 separates the beams returned through the first beam separation means 20 by partial transmission (P wave) and reflection (S wave). A sensor lens 32 for detecting and radiating beams separated by the splitter 31 and the second polarization beam splitter 31, and a first disk reading beam and a second disc reading beam from the beams sensed through the sensor lens 32. An optical pickup apparatus capable of multiple focusing, comprising a third polarization beam splitter (33) for separating the disc reading beam. 제1항 또는 제3항에 있어서, 상기 광검출수단(40)은 상기 제3편광빔 분할기(33)를 통해 분리된 빔들에서 상기 제1디스크(36)의 정보신호에 해당한 제1디스크 독취용 빔을 검출하여 전기적인 신호로 변환하는 제1광검출기(41)와, 상기 제3편광빔 분할기(33)를 통해 빔들에서 상기제2디스크(37)에 해당한 제2디스크 독취용 빔을 검출하여 전기적인 신호로 변환하는 제2광검출기(42)로 구성된 것을 특징으로 하는 다중 포커싱이 가능한 광픽업장치.4. The first disc dock according to claim 1 or 3, wherein the light detecting means (40) corresponds to an information signal of the first disc (36) in beams separated by the third polarization beam splitter (33). The first photodetector 41 which detects the picking beam and converts it into an electrical signal, and the second disk reading beam corresponding to the second disk 37 in the beams through the third polarization beam splitter 33. And a second photodetector (42) for detecting and converting the signal into an electrical signal. 제1항에 있어서, 상기 제1빔 분리수단(20)에 대신하여 상기 제2디스크(37)에 정보를 읽기 위한 제2디스크 독취용 빔은 투과하고, 상기 제1디스크(36)에 정보를 읽기 위한 제1디스크 독취용 빔은 반사시키는 제4편광빔 분할기(51)와, 상기 제4편광빔 분할기 (51)를 통해 투과된 제2디스크 독취용 빔의 반경을 상기 제4편광빔 분할기(51)를 통해 반사된 제1디스크 독취용 빔의 반경 보다 상대적으로 작게 하여 제1디스크(36)에 반사시키기 위해 상기 제4편광빔 분할기(51)의 후면에 부착되는 제3반사부(52)로 구성된 제3빔 분리수단(50)을 구비한 것을 특징으로 하는 다중 포커싱이 가능한 광픽업장치.The method of claim 1, wherein the second disk reading beam for reading information on the second disk (37) instead of the first beam separating means (20) is transmitted, and information is transmitted to the first disk (36). The fourth polarizing beam splitter 51 reflects the first disk reading beam for reading and the radius of the second disk reading beam transmitted through the fourth polarizing beam splitter 51 to the fourth polarizing beam splitter ( Third reflecting portion 52 attached to the rear surface of the fourth polarizing beam splitter 51 to reflect the first disk 36 to be smaller than the radius of the first disk reading beam reflected through the 51) Optical focusing apparatus capable of multiple focusing, characterized in that it comprises a third beam separation means (50) consisting of. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950004328A 1995-02-23 1995-03-03 Multi-focusing optical pickup KR0160204B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019950004328A KR0160204B1 (en) 1995-03-03 1995-03-03 Multi-focusing optical pickup
US08/579,143 US5671207A (en) 1995-02-23 1995-12-27 Optical pickup apparatus for performing multi-focusing
JP8007229A JPH08249718A (en) 1995-02-23 1996-01-19 Multiply focusable optical pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950004328A KR0160204B1 (en) 1995-03-03 1995-03-03 Multi-focusing optical pickup

Publications (2)

Publication Number Publication Date
KR960035482A true KR960035482A (en) 1996-10-24
KR0160204B1 KR0160204B1 (en) 1999-01-15

Family

ID=19409157

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950004328A KR0160204B1 (en) 1995-02-23 1995-03-03 Multi-focusing optical pickup

Country Status (1)

Country Link
KR (1) KR0160204B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100565797B1 (en) 2004-09-20 2006-03-29 삼성전자주식회사 Optical pick-up apparatus for multi recoding/reproducing
KR102210938B1 (en) 2017-11-28 2021-02-01 주식회사 엘지화학 A composition for shielding a waveguide edge with excellent adhesion

Also Published As

Publication number Publication date
KR0160204B1 (en) 1999-01-15

Similar Documents

Publication Publication Date Title
US5251198A (en) Reading device for multi-layered optical information carrier
KR920022229A (en) Optical pickup
KR960002192A (en) Optical pickup device
US6341116B1 (en) Compact optical pick-up head employing non-diffractive element
KR950004127A (en) Optical pickup device for magneto-optical disk
KR100213270B1 (en) Optical pickup for use with a double-sided disk
US7158274B2 (en) Pick-up apparatus for digital storage medium
KR960035482A (en) Optical pickup device capable of multiple focusing
US5570334A (en) Optical pickup with a double refraction polarizing plate to split light beams into two polarized beams
JPH09138967A (en) Optical pickup device
JPH09115177A (en) Optical pickup system
JPH06349104A (en) Optical pickup
KR940024705A (en) Optical pickup
NL1007369C2 (en) Optical recording system.
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
JP2636659B2 (en) Focusing error detector
KR0171079B1 (en) A recording and reproducing optical pickup system for the optical disk with plural recording layer in one side by generating successively different wavelength laser beam
KR960035484A (en) Optical pickup with dual focusing
KR960032337A (en) Optical pickup with multiple focusing
KR100234313B1 (en) Optical pickup apparatus
KR960007900B1 (en) Optical pick-up
KR970050420A (en) Optical pickup device
KR950004139A (en) Optical pickup device for magneto-optical disk
KR980004441A (en) Optical pickup device
KR950015247A (en) Optical pick-up device

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: 20060616

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee