KR960032357A - Optical head of optical disc recording / playback device - Google Patents

Optical head of optical disc recording / playback device Download PDF

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Publication number
KR960032357A
KR960032357A KR1019950002738A KR19950002738A KR960032357A KR 960032357 A KR960032357 A KR 960032357A KR 1019950002738 A KR1019950002738 A KR 1019950002738A KR 19950002738 A KR19950002738 A KR 19950002738A KR 960032357 A KR960032357 A KR 960032357A
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KR
South Korea
Prior art keywords
optical
reflected
optical disc
laser beam
light
Prior art date
Application number
KR1019950002738A
Other languages
Korean (ko)
Other versions
KR0141268B1 (en
Inventor
김진태
Original Assignee
배순훈
대우전자 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.)
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Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019950002738A priority Critical patent/KR0141268B1/en
Priority to JP8028155A priority patent/JP2740758B2/en
Priority to CN96104027A priority patent/CN1065347C/en
Publication of KR960032357A publication Critical patent/KR960032357A/en
Application granted granted Critical
Publication of KR0141268B1 publication Critical patent/KR0141268B1/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
    • G11B7/1353—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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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
    • G11B7/1359—Single prisms
    • 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)
  • Optical Recording Or Reproduction (AREA)

Abstract

본 발명은 광디스크 기록/재생장치의 광헤드에 관한 것으로, 광디스크(D)에 레이저비임을 전향시켜 그 광디스크(D)의 정보기록면으로 지향시키고 그 정보기록면으로부터 반사되는 광을 수광하는 광헤드를 갖춘 광디스크 기록/재생장치에서, 그 정보의 독취를 위한 레이저광을 방사하는 레이저광원(30)과, 그 레이저광원(30)에서 방사된 레이저비임을 3비임분할하는 회절판(31), 그 회절판(31)을 통과한 레이저비임을 대물렌즈를 매개하여 상기 정보기록매체를 향해 지향시키는 지향경로와 그 정보기록매체로부터 상기 대물렌즈(34)를 매개하여 반사되는 레이저비임의 반사광의 경로를 형성하는 각형 프리즘(32), 그 각형 프리즘(32)의 일측 저면에 형성되어 상기 반사광을 수광하는 수광소자(38)를 포함하여 구성되어, 레이저광원(30)에서 방사되어 회절판(31)에서 3비임분할된 레이저비임의 일부가 각형 프리즘(32)의 제1편광면(33)에서 편광되어 대물렌즈(34)를 매개하여 상기 광디스크(D)에 조사되고, 그 광디스크(D)에서 정보재생신호로서 얻어진 반사광이 대물렌즈(34)를 매개하여 제2편광면(37)을 투과하면서 편광되어 수광소자(38)에 의해 합성분과 차성분으로 얻어지도록 하여 그 전체적인 구조를 간략화한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head of an optical disk recording / reproducing apparatus, comprising an optical head for redirecting a laser beam to an optical disk (D), directed to an information recording surface of the optical disk (D), and receiving light reflected from the information recording surface. In an optical disc recording / reproducing apparatus, a laser light source 30 that emits laser light for reading the information, a diffraction plate 31 that divides the laser beam emitted from the laser light source 30 into three ratios, and the diffraction plate thereof (31) forming a path for directing the laser beam through the objective lens toward the information recording medium and a path of reflected light of the laser beam reflected from the information recording medium through the objective lens (34); It comprises a prismatic prism 32, a light receiving element 38 formed on the bottom surface of one side of the prismatic prism 32 to receive the reflected light, is emitted from the laser light source 30 to the diffraction plate 31 A portion of the three non-divided laser beams is polarized on the first polarization plane 33 of the prismatic prism 32 and irradiated onto the optical disc D via the objective lens 34, and information is reproduced on the optical disc D. The reflected structure obtained as a signal is polarized while being transmitted through the second polarization plane 37 through the objective lens 34, and is obtained by the light receiving element 38 as a synthetic component and a difference component, thereby simplifying the overall structure.

(제2도)(Figure 2)

Description

광디스크 기록/재생장치의 광헤드Optical head of optical disc recording / playback device

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

제2도는 본 발명의 바람직한 예에 따른 광디스크 기록/재생장치의 광헤드를 나타낸 도면2 is a view showing an optical head of an optical disc recording / reproducing apparatus according to a preferred embodiment of the present invention.

제3도(a) 내지 제3도(c)는 제2도에 도시된 본 발명의 바람직한 예에 따른 광디스크 기록/재생장치의 광헤드에 형성된 수광소자의 구성과 그 작용을 설명하는 예시도이다.3A to 3C are exemplary views for explaining the configuration and operation of the light receiving element formed in the optical head of the optical disc recording / reproducing apparatus according to the preferred embodiment of the present invention shown in FIG. .

Claims (7)

정보의 기록/재생이 가능한 광디스크(D)에 레이저비임을 전향시켜 상기 광디스크(D)의 정보기록면으로지향시키고 그 정보기록면으로부터 반사되는 광을 수광하는 광헤드를 갖춘 광디스크 기록/재생장치에 있어서,정보의 독취를 위한 레이저광을 방사하는 레이저광원(20)과, 상기 레이저광원(30)에서 방사된 레이저비임을3비임분할하는 회절판(31), 상기 회절판(31)을 통과한 레이저비임을 대물렌즈(34)를 매개하여 상기 광디스크(D)를 향해 지향시키는 지향경로와 그 광디스크(D)로부터 상기 대물렌즈(34)를 매개하여 반사되는 레이저비임의 반사광의 경로를 형성하는 각형 프리즘(32), 상기 각형 프리즘(32)의 일측 저면에 형성되어 상기 반사광을 수광하는 수광소자(38)를 포함하여 구성된 것을 특징으로 하는 광디스크 기록/재생장치의 광헤드.An optical disc recording / reproducing apparatus having an optical head which redirects a laser beam to an optical disc (D) capable of recording / reproducing information, directs it to an information recording surface of the optical disc (D), and receives light reflected from the information recording surface. A laser beam source 20 for emitting laser light for reading information, a diffraction plate 31 for dividing the laser beam emitted from the laser light source 30 into three beams, and a laser beam passing through the diffraction plate 31 Is a prismatic path for directing toward the optical disk D via the objective lens 34 and a prismatic prism for forming a path of reflected light of the laser beam reflected from the optical disk D through the objective lens 34. 32) an optical head of an optical disc recording / reproducing apparatus, comprising: a light receiving element (38) formed on one bottom surface of the prismatic prism (32) to receive the reflected light. 제1항에 있어서, 상기 수광소자(38)는 상기 각형 프리즘(32)의 일측 저면에 상기 광디스크(D)로부터 반사되는 반사광의 합성분과 차성분을 수광하도록 복수(39,40)로 형성된 것을 특징으로 하는 광디스크 기록/재생장치의 광헤드.2. The light receiving element (38) according to claim 1, wherein the light receiving element (38) is formed in plurality (39, 40) so as to receive a composite component and a difference component of the reflected light reflected from the optical disk (D) on one side of the prismatic prism (32). An optical head of an optical disc recording / reproducing apparatus. 제2항에 있어서, 상기 수광소자(38)의 수광부(40)에는 정보의 기록/재생을 위한 수광영역을 갖추어 구성된 것을 특징으로 하는 광디스크 기록/재생장치의 광헤드.The optical head of an optical disc recording / reproducing apparatus according to claim 2, wherein the light receiving portion (40) of the light receiving element (38) is provided with a light receiving area for recording / reproducing information. 제1항에 있어서, 상기 각형 프리즘(32)은 상기 3분할된 레이저비임의 일부를 상기 대물렌즈(34)를 매개하여 상기 광디스크(D)로 편광지향시키는 제1편광면(33)과, 상기 광디스크(D)로부터 반사되는 반사광을 재편광시켜 상기 광디스크(D)로부터의 반사광의 합성분과 차성분을 형성하기 위한 제2편광면(37)을 갖추어 구성된 것을 특징으로 하는 광디스크 기록/재생장치의 광헤드.The first polarizing surface 33 of claim 1, wherein the prismatic prism 32 polarizes a part of the three-segmented laser beam to the optical disk D via the objective lens 34, and the And a second polarization surface 37 for re-polarizing the reflected light reflected from the optical disk D to form a composite component and the difference component of the reflected light from the optical disk D. head. 제4항에 있어서, 상기 각형 프리즘(32)에서 상기 레이저광원(30)과 대응하는 종단 측면(35)에는 그 레이저광원(30)으로부터 방사되는 레이저비임의 세기를 모니터링하기 위한 모니터링 수광소자(36)가 형성된 것을 특징으로 하는 광디스크 기록/재생장치의 광헤드.The monitoring light receiving element (36) for monitoring the intensity of the laser beam emitted from the laser light source (30) on the terminal side (35) corresponding to the laser light source (30) in the prismatic prism (32). And an optical head of an optical disc recording / reproducing apparatus. 제4항에 있어서, 상기 각형 프리즘(32)의 제1편광면(33)은 MPBS(modified polarizing beam splitter)코팅면으로 형성된 것을 특징으로 하는 광디스크 기록/재생장치의 광헤드.The optical head of an optical disc recording / reproducing apparatus according to claim 4, wherein the first polarization surface (33) of the prismatic prism (32) is formed of a modified polarizing beam splitter (MPBS) coating surface. 제4항에 있어서, 상기 각형 프리즘(32)의 제2편광면(37)은 PBS코팅면으로 형성된 것을 특징으로 하는 광디스크 기록/재생장치의 광헤드.5. The optical head of an optical disc recording / reproducing apparatus according to claim 4, wherein the second polarization surface (37) of the prismatic prism (32) is formed of a PBS coating surface. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950002738A 1995-02-15 1995-02-15 Optical head for optical disk recording and reproducing device KR0141268B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019950002738A KR0141268B1 (en) 1995-02-15 1995-02-15 Optical head for optical disk recording and reproducing device
JP8028155A JP2740758B2 (en) 1995-02-15 1996-02-15 Optical head of optical disk recording / reproducing device
CN96104027A CN1065347C (en) 1995-02-15 1996-02-15 Optical head of optical disc recording/reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950002738A KR0141268B1 (en) 1995-02-15 1995-02-15 Optical head for optical disk recording and reproducing device

Publications (2)

Publication Number Publication Date
KR960032357A true KR960032357A (en) 1996-09-17
KR0141268B1 KR0141268B1 (en) 1998-07-15

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KR1019950002738A KR0141268B1 (en) 1995-02-15 1995-02-15 Optical head for optical disk recording and reproducing device

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JP (1) JP2740758B2 (en)
KR (1) KR0141268B1 (en)
CN (1) CN1065347C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011150767A (en) 2010-01-25 2011-08-04 Hitachi Media Electoronics Co Ltd Optical head

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR900008380B1 (en) * 1986-07-01 1990-11-17 미쓰비시덴기 가부시기 가이샤 Optical head apparatus
JPH03192305A (en) * 1989-12-22 1991-08-22 Toshiba Corp Optical element
US5272685A (en) * 1989-12-22 1993-12-21 Kabushiki Kaisha Toshiba Optical system for an information processing apparatus
JPH03225636A (en) * 1990-01-31 1991-10-04 Nec Corp Optical head device
US5331622A (en) * 1991-05-28 1994-07-19 Applied Magnetics Corporation Compact optical head
JPH06168473A (en) * 1992-09-30 1994-06-14 Omron Corp Optical recording and reproducing device

Also Published As

Publication number Publication date
CN1142659A (en) 1997-02-12
JPH08273189A (en) 1996-10-18
KR0141268B1 (en) 1998-07-15
CN1065347C (en) 2001-05-02
JP2740758B2 (en) 1998-04-15

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