KR960007901B1 - Optical pick-up apparatus of optical-magnetic disk system - Google Patents
Optical pick-up apparatus of optical-magnetic disk system Download PDFInfo
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- KR960007901B1 KR960007901B1 KR1019930027418A KR930027418A KR960007901B1 KR 960007901 B1 KR960007901 B1 KR 960007901B1 KR 1019930027418 A KR1019930027418 A KR 1019930027418A KR 930027418 A KR930027418 A KR 930027418A KR 960007901 B1 KR960007901 B1 KR 960007901B1
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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
- G11B7/1395—Beam splitters or combiners
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
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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
- G11B7/1362—Mirrors
Abstract
Description
제1도는 종래의 광자기디스크재생시스템의 광픽업장치의 구성를 설명하는 도면.1 is a view for explaining the configuration of an optical pickup apparatus of a conventional magneto-optical disc reproducing system.
제2도는 본 발명에 따른 광자기디스크재생시스템의 광픽업장치의 구성을 설명하는 도면이다.2 is a view for explaining the configuration of an optical pickup apparatus of the magneto-optical disc playback system according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
20 : 광자기 디스크 22 : 레이저광원20: magneto-optical disk 22: laser light source
24 : 회절격자 26 : 제1비임스플리터24 diffraction grating 26 first beam splitter
28 : 반사막 30 : 대물렌즈28: reflective film 30: objective lens
32 : 각형 프리즘 24 : 반사미러32: square prism 24: reflection mirror
36 : 수광다이오드 38 : 반사코팅막36: light-emitting diode 38: reflective coating film
40 : 반사코팅미러40: reflection coating mirror
본 발명은 광자기디스크재생시스템의 광픽업장치에 관한 것으로, 보다 상세하게는 광자기정보기억매체(Magneto-Optical Memory Medium)에 기록된 정보를 독취하기 위한 광자기디스크재생시스템의 광픽업 장치의 개량에 관한 것이다.The present invention relates to an optical pickup apparatus of a magneto-optical disk reproducing system, and more particularly, to an optical pickup apparatus of an optical-magnetic disc reproducing system for reading information recorded in a magneto-optical memory medium. It is about improvement.
최근, 자기적(磁氣的) 성질과 광학적 성질을 이용하여 자극의 방향에 따라 반사되는 광량의 차이를 정보신호로서 독취하는 방식의 광자기 디스크가 대용량의 정보기억매체로서 주목되고 있는 바, 그러한 광자기 디스크에 기록된 정보를 독취하기 위해서는 자기헤드와 광헤드가 설계된 광픽업장치가 사용된다.Recently, a magneto-optical disk, which reads the difference in the amount of light reflected according to the direction of the stimulus as an information signal using magnetic properties and optical properties, has been attracting attention as a large-capacity information storage medium. In order to read the information recorded on the magneto-optical disk, an optical pickup device in which a magnetic head and an optical head are designed is used.
그러한 광픽업장치의 일예가 미합중국 특허 제5,020,041호(명칭: 부유형 자기헤드(Floating Magnetic Head)를 갖춘 광자기메모리장치)에 개시되어 있다. 제1도는 그 미합중국 특허 제5,020,041호에 개시된 광자기메모리장치의 구성을 설명하는 도면으로, 그 제1도에 도시된 광자기 픽업장치의 구성에 따르면 로터리 모터와 같은 회전메카니즘에 의해 회동되는 광자기 디스크(1)는 광자기효과를 갖는 광자기 기록매체(101)와 디스크형상의 투면기판(103)상에 형성된 보호층(102)를 갖추어 구성되고, 반도체레이저로 구성되는 광원(2)으로부터 조사된 광은 콜리메이터 렌즈(3)에 의해 평행광으로 변환된 다음 비임스플리터(4)를 통해 액츄에이터(6)상에 장착된 포커싱렌즈(5)에 입사된다. 그 포커싱렌즈(5)에 의해 포커싱된 광비임은 디스크(1)의 기판(103)상에 조사되어 그 디스크(1)의 기록막(101)상에 대략 1㎛의 미세한 광스폿을 형성하게 된다.An example of such an optical pickup device is disclosed in US Patent No. 5,020,041 (name: magneto-optical memory device having a floating magnetic head). FIG. 1 is a view for explaining the configuration of the magneto-optical memory device disclosed in U.S. Patent No. 5,020,041. According to the configuration of the magneto-optical pick-up device shown in FIG. 1, the magneto-optical magnet rotated by a rotating mechanism such as a rotary motor The disk 1 is provided with a magneto-optical recording medium 101 having a magneto-optical effect and a protective layer 102 formed on the disk-shaped transmissive substrate 103 and irradiated from a light source 2 made of a semiconductor laser. The light is converted into parallel light by the collimator lens 3 and then enters the focusing lens 5 mounted on the actuator 6 through the beam splitter 4. The light beam focused by the focusing lens 5 is irradiated onto the substrate 103 of the disk 1 to form a fine light spot of approximately 1 탆 on the recording film 101 of the disk 1. .
상기 디스크(1)로부터 반사되는 광은 포커싱렌즈(5)를 통과하여 비임스플리터(4)에 의해 전향되고, 비임스플리터(7)에 의해 광자기신호검출광학계(8)와 광점제어신호검출광학계(9)에 입사되어 포커싱 및 오프트렉(Off-Track)이 검출이 이루어지도록 작용하게 된다.The light reflected from the disc 1 passes through the focusing lens 5 and is redirected by the beam splitter 4, and is arranged by the beam splitter 7 to provide an optical magnetic signal detection optical system 8 and an optical point control signal detection optical system ( 9), the focusing and off-track are detected to be detected.
그 광자기신호검출계(8)는 λ/2파장판(801)과 편광비임스플리터(803)를 사용하는 차동신호검출계이고, 그 광자기신호검출광학계(8)에 인가되는 광은 λ/2파장판(801)과 렌즈(802)를 통과하여 편광비임스플리터(803)에 의해 편광성분(S,P)으로 분리되며, 그 편광성분은 각기 광검출기(804,805)에 의해 검출되어 차동증폭기(10)에 의해 차동증폭되는 전기신호로 변환된 다음 광자기신호로 된다.The magneto-optical signal detector 8 is a differential signal detector using a lambda / 2 wavelength plate 801 and a polarization beam splitter 803, and the light applied to the magneto-optical signal detection optical system 8 is lambda / The polarizing components S and P are separated by the polarizing beam splitter 803 through the two wavelength plate 801 and the lens 802, and the polarizing components are detected by the photodetectors 804 and 805, respectively. 10) is converted into an electric signal which is amplified differentially and then becomes a magneto-optical signal.
또, 부유형 자기헤드(12)는 디스크(1)에 대해 광헤드(11)와 반대측인 기록막(103)측에 배치되고, 그 자기헤드(12)는 기록막에 자계를 인가하기 위한 코일과 헤드어셀블리를 부유시키기 위한 슬라이더를 갖추어 구성되며, 디스크(1)가 회동하는 동안 그 디스크의 회전에 의해 생성되는 기압에 의해 일정한 부유높이를 가지고서 부유된다. 또한 그 부유형 자기헤드(12)는 지지암(15)에 의해 광헤드(15)와 일체로 결합되어 그 광헤드(11)와 연동하게 되고, 그 광헤드(11)와 자기헤드(12) 사이의 간격은 일정하게 된다.Further, the floating magnetic head 12 is disposed on the recording film 103 side opposite to the optical head 11 with respect to the disk 1, and the magnetic head 12 is a coil for applying a magnetic field to the recording film. And a slider for floating the head assembly, and are floated at a constant float height by the air pressure generated by the rotation of the disk while the disk 1 rotates. In addition, the floating magnetic head 12 is integrally coupled with the optical head 15 by the support arm 15 to be interlocked with the optical head 11, and the optical head 11 and the magnetic head 12. The interval between them becomes constant.
그런데, 제1도에 도시된 종래의 광자기 픽업장치에 구성되는 광헤드(11)는 레이저광원(2)으로부터 방사되는 광비임을 디스크(1)에 조사하기 위해 콜리메이터 렌즈(3)와 비임스플리터(4), 포커싱렌즈(5) 및 액츄에이터(6)가 구비되는 한편, 상기 디스크(1)로부터 반사되는 반사광이 비임스플리터(4)를 통과하여 비임스플리터(7)에 의해 지향되는 광을 사이 디스크(1)에 대한 포커싱 및 트랙킹신호로서 검출하는 포커싱트랙킹 제어신호검출계(9)에 인가되도록 함과 더불어 디스크(1)에 기록된 정보신호를 얻기 위해 λ/2파장판(801)과 렌즈(802), 상기 반사광으로부터 편광성분(S,P)을 얻기 위한 편광비임스플리터(803) 및 그 편광성분을 검출하기 위한 광검출기(804,805)를 갖춘 광자기신호검출계(8)를 갖추어 구성되고, 그러한 광헤드(11)의 각 구성요소가 광자기신호의 검출을 위한 단계에 따라 일렬배치되므로 그 구성이 상당히 복잡하게 되며, 그에 따라 그 광헤드의 부피가 증대될 뿐만 아니라 제작공정이 번잡해지게 된다.By the way, the optical head 11 of the conventional magneto-optical pickup device shown in FIG. 1 has a collimator lens 3 and a beam splitter (2) for irradiating the disk 1 with light beams emitted from the laser light source 2. 4), the focusing lens 5 and the actuator 6 are provided, while the reflected light reflected from the disk 1 passes through the beam splitter 4 and is directed by the beam splitter 7. Λ / 2 wavelength plate 801 and lens 802 to be applied to a focusing tracking control signal detection system 9 that detects as a focusing and tracking signal for 1) and to obtain an information signal recorded on the disc 1 And a magneto-optical signal detector 8 having a polarization beam splitter 803 for obtaining polarization components S and P from the reflected light and photodetectors 804 and 805 for detecting the polarization components. Each component of the optical head 11 is used to check the optical magnetic signal. Since a line along the steps for that consists of a fairly complex, and thus it becomes not only the volume of the optical head will increase the manufacturing process is complicated.
본 발명은 상기한 종래 기술을 감안하여 이루어진 것으로, 광자기 디스크에 대해 광비임을 조사하고 그 디스크로부터 반사되는 광을 검출하여 정보를 독취하는 광자기 픽업장치에서 광헤드를 간단한 구조로 설계하여 구성된 광자기디스크재생시스템의 광픽업장치를 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above-described prior art, and is designed by designing an optical head with a simple structure in a magneto-optical pickup device that irradiates light beams to a magneto-optical disk and detects light reflected from the disk to read information. It is an object of the present invention to provide an optical pickup apparatus of a magnetic disc playback system.
상기한 목적을 달성하기 위해 본 발명에 따르면, 자기적 성질과 광학적 성질을 이용하여 자기헤드에 의해 기록된 광자기 디스크상의 정보를 재생하는 광픽업장치를 갖춘 광자기디스크재생시스템에 있어서, 상기 광픽업장치는 상기 광자기 디스크의 표면에 조사되는 레이저비임을 발생하는 레이저광원과, 이 레이저광원에서 발생되는 레이저비임을 대물렌즈를 통해 상기 광자기 디스크상에 조사되도록 반사하는 제1비임스플리터, 상기 광자기 디스크에서 반사되어 상기 비임스플리터를 통과하는 반사광을 재차 상기 비임스플리터측으로 반사시키는 반사면을 갖춘 각형 프리즘, 상기 제1비임스플리터로부터 반사되는 반사광의 일부 성분을 수광소자측으로 반사시키는 제2비임스플리터, 상기 제2비임스플리터를 통과한 반사광의 잔여 성분을 상기 수광소자측으로 반사시키는 반사코팅미러를 갖추어 구성된 광자기디스크재생시스템의 광픽업장치가 제공된다.According to the present invention for achieving the above object, in the magneto-optical disc reproducing system having an optical pickup device for reproducing information on the magneto-optical disc recorded by the magnetic head using magnetic properties and optical properties, The pickup apparatus includes a laser light source for generating a laser beam irradiated onto the surface of the magneto-optical disk, a first beam splitter for reflecting the laser beam generated from the laser light source onto the magneto-optical disk through an objective lens, A prismatic prism having a reflecting surface reflecting the reflected light passing through the beam splitter and reflected by the magneto-optical disk, and a second beam splitter reflecting some components of the reflected light reflected from the first beam splitter to the light receiving element side. And receiving the residual components of the reflected light passing through the second beam splitter. The optical pickup device according to the character-reflection coating mirror the magneto-optical disk reproducing system is configured for reflecting equipped side is provided.
본 발명에 따르면, 사이 제1비임스플리터는 PBS(Polarize Beam Splitter)코팅막으로 구성되고, 상기 제2비임스플리터도 PBS코팅막으로 구성된다.According to the present invention, the first beam splitter is composed of a PBS (Polarize Beam Splitter) coating film, and the second beam splitter is also composed of a PBS coating film.
이와 같이 구성된 본 발명에 따른 광자기디스크재생시스템의 광픽업장치에 의하면, 레이저광원으로부터 발생되는 레이저비임이 제1비임스플리터에서 반사되어 광자기 디스크에 조사되고 그 광자기 디스크로부터 반사되는 반사광이 각형 프리즘의 하측에 설치된 반사미러에서 상기 제1비임스플리터와 제2비임스플리터 및 반사코팅막을 통해 반사되어 수광소자에 제공되므로 상기 광자기 디스크상에 기록된 정보의 독출이 가능하게 된다.According to the optical pickup apparatus of the magneto-optical disk reproducing system according to the present invention configured as described above, the laser beam generated from the laser light source is reflected by the first beam splitter, is irradiated onto the magneto-optical disk, and the reflected light reflected from the magneto-optical disk is square. The reflection mirror provided on the lower side of the prism is reflected by the first beam splitter, the second beam splitter, and the reflective coating film to be provided to the light receiving element, thereby reading information recorded on the magneto-optical disk.
이하, 본 발명에 따른 광자기디스크재생시스템의 광픽업장치에 대해 상세하게 설명한다.Hereinafter, the optical pickup apparatus of the magneto-optical disc playback system according to the present invention will be described in detail.
제2도는 본 발명에 따른 광자기디스크재생시스템의 광픽업장치의 설명에 이용되는 개략단면도로서, 20은 통상적으로 자기헤드의 자기적인 성질에 의해 정보가 기록되는 광자기 디스크를 나타내고, 22는 상기 광자기 디스크(20)상에 기록된 정보의 독출을 위한 레이저비임을 발생하는 예컨대 반도체레이저로 구성된 레이저광원을 나타내며, 24는 상기 레이저광원(22)에서 발생되는 레이저비임을 3비임으로 분할하는 회절격자를 나타낸다. 또, 26은 상기 회절격자(24)에서 3비임으로 분할딘 레이저비임을 대물렌즈(30)를 통해 상기 광자기 디스크(20)상의 소망하는 위치, 즉 정보의 독출위치에 조사되도록 상기 레이저비임을 반사시키는 제1임스플리터를 나타내는 바, 그 제1비임스플리터(26)의 반사면(28)에는 PBS(Polarize Beam Splitter)코팅이 실시된다.2 is a schematic cross-sectional view used for explaining the optical pickup apparatus of the magneto-optical disk reproducing system according to the present invention, where 20 is an optical magnet disk in which information is recorded by the magnetic properties of the magnetic head, and 22 is the above-mentioned. Represents a laser light source composed of, for example, a semiconductor laser for generating a laser beam for reading information recorded on the magneto-optical disk 20, and 24 denotes a diffraction dividing the laser beam generated from the laser light source 22 into three beams. Represent the lattice. In addition, 26 denotes the laser beam divided into three beams in the diffraction grating 24 so that the laser beam is irradiated to the desired position on the magneto-optical disk 20 through the objective lens 30, that is, the information reading position. A first impeller to be reflected is shown, and a PBS (Polarize Beam Splitter) coating is applied to the reflective surface 28 of the first beam splitter 26.
32는 상기 제1비임스플리터(26)의 반사면(28)과 계면접착되는 각형 프리즘으로서, 그 저면에는 상기 제1 비임스플리터(26)의 반사면(28)에서 반사되어 대물렌즈(30)를 통해 상기 광자기 디스크(20)의 표면에 조사된 레이저비임이 그 광자기 디스크(20)로부터 반사되어 상기 대물렌즈(30)와 상기 제1비임스플리터(26)의 반사면(28)을 통해 입사되는 반사광을 재차 상기 반사면(28)을 통해 반사시키는 반사미러(34)가 형성됨과 더불어 그 반사미러(34)와 인접한 위치에는 상기 반사광을 수광하는 수광다이오드(36)가 설치된다. 또, 그 각형 프리즘(26)의 일면에는 상기 반사미러(34)에서 반사되어 상기 반사면(28)에 제공되는 상기 광자기디스크(20)로부터의 반사광을 편광시켜 그 편광성분중 하나의 성분을 상기 수광다이오드(36)측으로 반사시키는 제2비임스플리터로서 작용하는 편광코팅막(38)이 갖추어짐과 더불어 그 편광코팅막(38)에 의해 편광된 다른 하나의 편광성분을 상기 수광다이오드(36)측으로 집광시키는 반사코팅미러(40)가 접착된다.32 is a prismatic prism interfacing with the reflective surface 28 of the first beam splitter 26, the bottom surface of which is reflected by the reflective surface 28 of the first beam splitter 26 to provide an objective lens 30. The laser beam irradiated onto the surface of the magneto-optical disk 20 is reflected from the magneto-optical disk 20 and incident through the reflecting surface 28 of the objective lens 30 and the first beam splitter 26. The reflective mirror 34 reflecting the reflected light through the reflective surface 28 is formed, and a light receiving diode 36 for receiving the reflected light is provided at a position adjacent to the reflective mirror 34. In addition, one surface of the prismatic prism 26 is reflected by the reflecting mirror 34 to polarize the reflected light from the magneto-optical disk 20 provided on the reflecting surface 28 so that one component of the polarizing component is polarized. A polarizing coating film 38 serving as a second beam splitter for reflecting toward the light receiving diode 36 side is provided, and the other polarization component polarized by the polarizing coating film 38 is focused on the light receiving diode 36 side. The reflective coating mirror 40 is bonded.
이와 같이 구성된 본 발명에 따른 광자기디스크재생시스템의 광픽업장치에 의하면, 레이저광원(22)에서 발생된 레이저비임은 회절격자(24)를 통해 제1비임스플리터(24)의 반사막(26)을 통해 대물렌즈(30)에 입사되고, 그 레이저비임은 대물렌즈(30)의 작용에 의해 상기 광자기 디스크(20)의 표면에 집광된다. 그 광자기디스크(20)의 표면에 집광딘 레이저비임은 광자기 디스크(20)의 표면에 형성된 예컨대 피트열(Pit列)과 같은 정보기록패턴에 따라 변화되는 반사광으로서 대물렌즈(30)와 상기 제1비임스플리터(26)의 반사막(28)을 통해 상기 각형 프리즘(32)의 반사미러(34)로 지향된다. 그 반사미러(34)에 지향된 반사광은 재차 상기 제1비임스플리터(26)의 반사막(28)에서 수평방향으로 반사된 다음 그 각형 프리즘(32)의 일면에 형성되어 제2비임스플리터로서 작용하는 반사코팅막(38)에 입사되고, 그 반사코팅막(38)에 입사된 반사광은 그 반사코팅막(38)에 의해 편광되어 그중 하나의 편광성분은 상기 수광다이오드(36)측으로 반사되는 반면 다른 하나의 편광성분은 그 반사코팅막(38)을 통과하여 상기 반사코팅미러(40)에 도달된 다음 그 반사코팅미러(40)에서 상기 수광다이오드(36)상에 집광된다.According to the optical pickup apparatus of the magneto-optical disk reproducing system according to the present invention configured as described above, the laser beam generated from the laser light source 22 is used to form the reflection film 26 of the first beam splitter 24 through the diffraction grating 24. The incident light is incident on the objective lens 30, and the laser beam is focused on the surface of the magneto-optical disk 20 by the action of the objective lens 30. The laser beam focused on the surface of the magneto-optical disk 20 is a reflected light which is changed in accordance with an information recording pattern such as, for example, a pit array, formed on the surface of the magneto-optical disk 20. The reflective film 28 of the first beam splitter 26 is directed to the reflective mirror 34 of the prismatic prism 32. The reflected light directed to the reflective mirror 34 is again reflected horizontally in the reflective film 28 of the first beam splitter 26 and then formed on one surface of the prismatic prism 32 to act as a second beam splitter. Reflected light incident on the reflective coating film 38 and incident on the reflective coating film 38 is polarized by the reflective coating film 38 so that one polarization component is reflected toward the light-receiving diode 36, while the other polarization is reflected. The component passes through the reflective coating film 38 to reach the reflective coating mirror 40 and is then focused on the light receiving diode 36 in the reflective coating mirror 40.
따라서, 상기한 본 발명에 따른 광자기디스크재생시스템의 광픽업장치에 의하면, 제1비임스플리터(26)와 각형 프리즘(32) 및 반사코팅미러(40)에 의해 렌즈계의 주요부가 형성되고, 상기 제1비임스플리터(26)와 상기 각형 프리즘(32)과의 사이에 레이저비임의 반사막(28)이 형성되는 한편 상기 각형 프리즘(32)과 상기 반사코팅미러(40)와의 계며네 편광코팅막(38)이 설치되며, 상기 각형 프리즘(32)의 저면측에 반사광을 반사시키는 반사미러(34)와 수광다이오드(36)가 제공된 간단한 구조의 광픽업장치가 실현되므로, 종래의 광픽업장치에 비해 부품의 수가 감소됨과 더불어 광픽업장치의 배치가 용이하게 되고, 그에 따라 박형의 광픽업장치가 제작될 수 있다.Therefore, according to the optical pickup apparatus of the magneto-optical disk reproducing system according to the present invention, the main part of the lens system is formed by the first beam splitter 26, the prismatic prism 32 and the reflective coating mirror 40. A reflective film 28 of the laser beam is formed between the first beam splitter 26 and the prismatic prism 32 while the polarizing coating film 38 between the prismatic prism 32 and the reflective coating mirror 40 is formed. Is provided, and the optical pickup device of the simple structure provided with the reflection mirror 34 and the light-receiving diode 36 reflecting the reflected light on the bottom side of the prismatic prism 32 is realized, compared to the conventional optical pickup device. The number of s is reduced and the arrangement of the optical pickup device becomes easy, whereby a thin optical pickup device can be manufactured.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930027418A KR960007901B1 (en) | 1993-12-13 | 1993-12-13 | Optical pick-up apparatus of optical-magnetic disk system |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019930027418A KR960007901B1 (en) | 1993-12-13 | 1993-12-13 | Optical pick-up apparatus of optical-magnetic disk system |
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| Publication Number | Publication Date |
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| KR950022275A KR950022275A (en) | 1995-07-28 |
| KR960007901B1 true KR960007901B1 (en) | 1996-06-15 |
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