KR970005986B1 - Optical pick-up device - Google Patents

Optical pick-up device Download PDF

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Publication number
KR970005986B1
KR970005986B1 KR1019940017628A KR19940017628A KR970005986B1 KR 970005986 B1 KR970005986 B1 KR 970005986B1 KR 1019940017628 A KR1019940017628 A KR 1019940017628A KR 19940017628 A KR19940017628 A KR 19940017628A KR 970005986 B1 KR970005986 B1 KR 970005986B1
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KR
South Korea
Prior art keywords
magneto
light
pbs
reflected
optical
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KR1019940017628A
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Korean (ko)
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KR960005478A (en
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김진태
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대우전자 주식회사
배순훈
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Priority to KR1019940017628A priority Critical patent/KR970005986B1/en
Publication of KR960005478A publication Critical patent/KR960005478A/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
    • G11B7/1395—Beam splitters or combiners
    • 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
    • G11B7/1372—Lenses
    • G11B7/1376—Collimator lenses

Abstract

A light pickup apparatus of an optical magnetic disk playing system is disclosed. The light beam is generated from a laser light source(21). The beam is splitted to three beams by a diffraction lattice. The three beams are transformed to parallel beams by a collimation lens(23). The transformed laser beam is irradiated on an optical magnetic disk(20). A reflected beam from the optical magnetic disk(20) is transmitted to a light receiving element(26). A PBS(Polarized Beam Splitter)(5) includes a first PBS coating surface(241) changes the direction of the reflected beam from the optical magnetic disk(20) to a vertical direction; a second PBS coating surface(242) for passing a portion of the beam and collecting to the light receiving element(26); a full reflection surface(243) for collecting the remaining of the reflected beam to the light receiving element(26); and a hologram element surface(244) for performing a hologram operation.

Description

광자기디스크재생시스템의 광픽업장치Optical pickup device of magneto-optical disc playback system

제1도는 종래의 광자기디스크재생시스템의 광픽업장치의 구성을 나타낸 도면.1 is a diagram showing the configuration of an optical pickup apparatus of a conventional magneto-optical disc reproducing system.

제2도는 본 발명에 따른 광자기디스크재생시스템의 광픽업장치의 구성을 나타낸 도면이다.2 is a diagram showing 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

1 : 광자기디스크 2 : 레이저광원1: magneto-optical disc 2: laser light source

3 : 회절격자 4 : 콜리메이트렌즈3: diffraction grating 4: collimated lens

5 : PBS블럭 6 : 프리즘미러5: PBS block 6: prism mirror

8 : 대물렌즈 9 : 모니터링 수광소자8: objective lens 9: monitoring light receiving element

10 : 자기헤드 20 : 광자기디스크10: magnetic head 20: magneto-optical disk

21 : 레이저광원 22 : 회절격자21: laser light source 22: diffraction grating

23 : 콜리메이트렌즈 24 : PBS블럭23: collimated lens 24: PBS block

25 : 대물렌즈 26 : 수광소자25 objective lens 26 light receiving element

본 발명은 광자기디스크재생시스템의 광픽업장치에 관한 것으로, 보다 상세하게는 광자기디스크재생시스템에 적용되어 광자기정보기록매체로부터 기록정보를 독출하는 광픽업장치의 구성이 간단화되도록 한 광자기디스크재생시스템의 광픽업장치에 관한 것이다.The present invention relates to an optical pickup apparatus of a magneto-optical disc reproducing system. More particularly, the present invention is applied to the magneto-optical disc reproducing system to simplify the configuration of the optical pickup apparatus for reading recording information from the magneto-optical information recording medium. An optical pickup apparatus of a magneto-optical disc playback system.

현재, 정보의 재기록이 가능한 형태로 제안되는 광자기디스크로 대표되는 광자기정보기록매체를 취급하도록 된 광자기디스크재생시스템에서는 광자기디스크기록매체에 기록된 자극의 방향에 따라 반사되는 광량의 차이를 정보신호로서 독취하게 하고, 그 점에서 광자기디스크재생시스템에는 광자기디스크상에 기록된 정보를 독취하기 위해 자기헤드와 광헤드가 설치된 광픽업장치가 사용되고 있다.At present, in the magneto-optical disc reproducing system which is designed to handle the magneto-optical information recording medium represented by the magneto-optical disc proposed in the form of rewritable information, the difference in the amount of light reflected depending on the direction of the magnetic pole recorded on the magneto-optical disc recording medium. The optical pickup apparatus provided with the magnetic head and the optical head is used for reading the information recorded on the magneto-optical disk.

이러한 광픽업장치의 구성의 일예에 따르면, 제1도에 도시된 바와 같이 광자기디스크(1)의 정보를 억세스 하기 위해 반도체레이저로 이루어진 레이저광원(2)으로 부터 방사된 레이저빔이 회절격자(3)에 의해 3비임 분한된 다음 콜리메이트렌즈(Collimate Lens : 4)를 통해 평행광으로 변화되게 되고, 그 콜리메이트렌즈(4)를 통과하면서 평행한 광으로 변환된 레이저비임은 PBS블록(Polarized Beam Splitter : 5)을 통해 프리즘미러(Prism Mirror : 6)로 입사된다. 이 프리즘미러(6)는 레이저비임을 광자기디스크(1)를 향해 전향시켜 대물렌즈(8)를 통해 광자기디스크(1)의 기록면상에 약 1㎛정도의 미세한 광스폿으로 집광되도록 작용하게 된다.According to an example of the configuration of such an optical pickup device, as shown in FIG. 1, a laser beam radiated from a laser light source 2 made of a semiconductor laser is used to access the information of the magneto-optical disk 1. 3) the beam is divided into 3 beams and then converted into parallel light through the collimator lens 4, and the laser beam converted into parallel light while passing through the collimator lens 4 is PBS block (Polarized). It enters into the prism mirror (Prism Mirror 6) through the beam splitter (5). The prism mirror 6 redirects the laser beam toward the magneto-optical disk 1 so that the laser beam is focused on the recording surface of the magneto-optical disk 1 through the objective lens 8 with a fine light spot of about 1 탆. do.

또한, 자기헤드(10), 특히 부유형 자기헤드(10)는 레이저비임이 조사되는 위치와 대향하는 광자기디스크(1)의 상부측에 배치되어 광헤드와 일체로 되어 송메카니즘에 의해 연동되어지면서 이 광자기디스크(1)상에 정보의 기록 및 재생을 위한 자계를 형성하게 된다.In addition, the magnetic head 10, in particular the floating magnetic head 10, is disposed on the upper side of the magneto-optical disk 1 opposite the position to which the laser beam is irradiated, and is integrated with the optical head and interlocked by a song mechanism. As a result, a magnetic field for recording and reproducing information is formed on the magneto-optical disk 1.

또한 상기 PBS블록(5)에 갖추어진 부분반사면(5a)에서 반사되는 광비임의 일부는 레이저광원(2)의 레이저출력을 제어하도록 모니터링하기 위한 모니터링수광소자(9)에 입사되게 된다.In addition, a part of the light beam reflected from the partial reflection surface 5a provided in the PBS block 5 is incident on the monitoring light receiving element 9 for monitoring to control the laser output of the laser light source 2.

그리고, 광자기디스크(1)의 기록면상에 3분할비임방식으로 입사되어 그 광자기디스크(1)에서 반사되는 반사광은 대물렌즈(8)를 통해 평행광으로 변환되어 프리즘미러(6)에서 재차 진행방향이 직각방향으로 전향되고, 이어 PBS블록(5)의 반사면(5a, 5b)을 통해 수광소자(14)측으로 전향된 다음 회절프리즘(11)을 통해 다시 3분할되어 전체적으로 9분할비임화된다. 그 9분할된 반사광은 콜리메이트(12)와 비점수차를 발생시키는 센서렌즈(13)를 통해 수공소자(14)에 수광되어 포커싱서보에 이용됨과 더불어 정보의 독출 및 트랙킹서보에 적용된다.Then, the reflected light incident on the recording surface of the magneto-optical disk 1 in a three-division beam method and reflected from the magneto-optical disk 1 is converted into parallel light through the objective lens 8, and again in the prism mirror 6 The advancing direction is turned at right angles, and then the light is directed to the light receiving element 14 through the reflective surfaces 5a and 5b of the PBS block 5, and then divided into 3 parts by the diffraction prism 11, thereby totaling 9 division beams. do. The nine-segmented reflected light is received by the hand element 14 through the collimator 12 and the sensor lens 13 generating astigmatism, which is used for the focusing servo and applied to the reading and tracking of the information.

그러나, 이러한 구성요소를 구비한 광픽업장치에서는 레이저광원에서부터 레이저비임을 조사하여 광자기디스크로부터 반사되는 반사광에 의해 정보의 독취 및 포커싱·트랙킹서보를 위한 광학계의 구성이 복잡할 뿐만 아니라, 그 광학계의 복잡화된 구성에 대한 작업공수 및 광효율의 저하가 수반된다는 불리함이 있다.However, in the optical pickup apparatus having such a component, not only the configuration of the optical system for reading information and focusing / tracking servo by the reflected light reflected from the magneto-optical disk by irradiating the laser beam from the laser light source, but also the optical system There is a disadvantage that the workmanship and light efficiency of the complicated configuration is accompanied.

본 발명은 상기한 사정을 감안하여 이루어진 것으로, 광학계의 부품점수(部品点數)를 감소시켜 전체적인 구성이 간략화되도록 한 광자기디스크의 역세스에 적합한 광자기디스크재생시스템의 광픽업장치를 제공함에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an optical pickup apparatus of an optical magneto disc reproducing system suitable for the access of an optical magneto disc which reduces the number of parts of the optical system so that the overall configuration is simplified. The purpose is.

상기한 목적을 달성하기 위해, 본 발명의 바람직한 실시예에 따르면 레이저광원에서 방사되어 회절격자에 의해 3비임분할되고 콜리메이트렌즈에 의해 평행광으로 변환된 레이저비임을 대물렌즈를 매개하여 광자기디스크상에 조사되도록 하거나 그 광자기디스크상에서 반사되는 반사광을 수광소자측으로 전달되도록 하는 PBS블럭을 갖추어 구성되고, 그 PBS블럭은 상기 광자기디스크로부터 반사되는 반사광을 직각방향으로 전향시키는 제1PBS코팅면과, 그 제1PBS코팅면에서 전향된 상기 반사광의 일부는 통과시키는 반면 나머지 부분은 상기 수광소자측으로 집광되도록 하는 제2PBS코팅면, 이 제2PBS코팅면을 통과한 상기 반사광의 나머지부분을 상기 센서렌즈를 매개하여 상기 수광소자측으로 집광되도록 하는 전반사면 및, 그 PBS블럭의 저면에 형성되어 상기 반사광에 대한 홀로그램작용을 행하는 홀로그램소자면을 갖추어 구성된 광자기디스크재생시스템의 광픽업장치가 제공된다.In order to achieve the above object, according to a preferred embodiment of the present invention, a laser beam radiated from a laser light source, three-divided by a diffraction grating, and converted into parallel light by a collimated lens, through an objective lens And a PBS block for irradiating onto the light or reflecting the reflected light reflected on the magneto-optical disk to the light-receiving element, the PBS block having a first PBS coating surface for redirecting the reflected light reflected from the magneto-optical disk in a right direction. And a second PBS coating surface for passing a part of the reflected light redirected from the first PBS coating surface while collecting the remaining portion toward the light receiving element side, and rest of the reflected light passing through the second PBS coating surface for the sensor lens. A total reflection surface for condensing toward the light-receiving element side and a bottom surface of the PBS block The optical pickup apparatus of a magneto-optical disk reproducing system constructed and equipped with the hologram element surface for performing hologram effect on group reflection light is provided.

바람직하게, 상기 홀로그램소자면은 상기 제2PBS코팅면과 상기 전반사면에서 반사되는 반사광에 대한 홀로그램작용이 이루어지도록 상기 제2PBS코팅면과 상기 전반사면의 하측에 형성된다.Preferably, the hologram element surface is formed below the second PBS coating surface and the total reflection surface so as to perform a hologram effect on the reflected light reflected from the second PBS coating surface and the total reflection surface.

이와 같이 구성된 본 발명에 따른 광자기디스크재생시스템의 광픽업장치에 따르면 레이저비임을 대물렌즈를 매개하여 광자기디스크상에 조사되도록 하거나 그 광자기디스크상에서 반사되는 반사광을 수광소자측으로 전달되도록 하는 PBS블록을 상기 광자기디스크로부터 반사되는 반사광을 직각방향으로 전향시키는 제1PBS코팅면과, 그 제1PBS코팅면에서 전향된 상기 반사광의 일부는 통과시키는 반면 나머지 부분은 상기 수광소자측으로 집광되도록 하는 제2PBS코팅면, 이 제2PBS코팅면을 통과한 상기 반사광의 나머지부분을 상기 수광소자측으로 집광되도록 하는 전반사면 및, 그 PBS블럭의 저면에 증착형성되어 상기 반사광에 대한 홀로그램작용을 행하는 홀로그램소자면을 갖도록 함으로써 전체적인 광학계의 구성이 간단화된다.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 is irradiated onto the magneto-optical disk via an objective lens or the PBS for transmitting the reflected light reflected from the magneto-optical disk to the light receiving element side. A first PBS coating surface for redirecting the reflected light reflected from the magneto-optical disk in a perpendicular direction, and a second PBS for passing a part of the reflected light redirected from the first PBS coating surface while collecting the remaining portion toward the light receiving element side A coating surface, a total reflection surface for condensing the remaining portion of the reflected light passing through the second PBS coating surface to the light receiving element side, and a hologram element surface formed by depositing on the bottom of the PBS block to perform a hologram action on the reflected light; This simplifies the configuration of the overall optical system.

이하, 본 발명에 대해 첨부도면을 참조하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

제2도는 본 발명에 따른 광자기디스크재생시스템의 광픽업장치를 설명하는 도면으로, 참조부호 21은 광자기디스크(20)상에 정보를 기록하거나 그 광자기디스크(20)상에 기록된 정보를 독취하기 위해 광자기디스크(20)에 레이저비임을 방사하는 레이저광원을 나타내고, 22는 그 레이저광원(20)에서 방사된 레이저비임을 3비임으로 분할하는 회절격자를 나타내며, 23은 그 회절격자(22)에 의해 3비임분할된 레이저비임을 평행하게 변환하는 콜리메이트렌즈를 나타낸다.2 is a view for explaining an optical pickup apparatus of a magneto-optical disk reproducing system according to the present invention, and reference numeral 21 denotes information recorded on or on the magneto-optical disk 20. Represents a laser light source that emits a laser beam to the magneto-optical disk 20 in order to read the equation, 22 represents a diffraction grating dividing the laser beam emitted from the laser light source 20 into three beams, and 23 represents the diffraction grating. A collimated lens for converting the three non-divided laser beams in parallel by (22) is shown.

24는 레이저비임을 대물렌즈(25)를 매개하여 광자기디스크(20)상에 조사되도록 하거나 그 광자기디스크(20)상에서 반사되는 반사광을 수광소자(26)측으로 전달되도록 하는 PBS블럭을 나타내는 바, 본 발명에 따르면 그 PBS블럭(24)은 상기 광자기디스크(20)으로부터 반사되는 반사광을 직각방향으로 전향시키는 제1PBS코팅면(241)과, 그 제1PBS코팅면(241)에서 전향된 상기 반사광의 일부(P파)는 통과시키는 반면 나머지 부분(S파)는 상기 수광소자(26)측으로 집광되도록 하는 제2PBS코팅면(242), 이 제2PBS코팅면(242)을 통과한 상기 반사광의 나머지 부분(P파)을 상기 수광소자(26)측으로 집광되도록 하는 전반사면(243) 및, 그 PBS블럭(24)의 저면에 증착형성되어 상기 반사광에 대한 홀로그램작용을 행하는 홀로그램소자면(244)을 갖추어 구성된다.24 denotes a PBS block for irradiating the laser beam onto the magneto-optical disk 20 via the objective lens 25 or for transmitting the reflected light reflected on the magneto-optical disk 20 to the light receiving element 26 side. According to the present invention, the PBS block 24 has a first PBS coating surface 241 for redirecting the reflected light reflected from the magneto-optical disk 20 in a right direction, and the first PBS coating surface 241 is turned from the first PBS coating surface 241. A portion (P wave) of the reflected light passes while the other portion (S wave) passes through the second PBS coating surface 242 and the second PBS coating surface 242 to concentrate the light receiving element 26 side. The total reflection surface 243 for condensing the remaining portion (P wave) to the light receiving element 26 side, and the hologram element surface 244 which is formed on the bottom surface of the PBS block 24 to perform a hologram action on the reflected light. It is configured with.

여기서, 상기 홀로그램소자면(244)은 상기 제2PBS코팅면(242)과 상기 전반사면(243)에서 반사되는 반사광에 대한 홀로그램작용이 이루어져서 정보의 독취 및 포커싱·트랙킹이 가능한 상태로 하여 상기 수광소자(26)에 전달되도록 작용하게 된다.Here, the hologram element surface 244 has a hologram effect on the reflected light reflected from the second PBS coating surface 242 and the total reflection surface 243 to enable reading, focusing, and tracking of the information. Act to be delivered to (26).

이러한 구성을 가지는 본 발명에 따른 광자기디스크재생시스템의 광픽업장치에 의하면, 레이저광원(21)에서 방사된 레이저비임은 회절격자(22)에 의해 3비임으로 분할된 다음 콜리메이트렌즈(23)에 의해 평행한 광으로 변환되고, 그 평행한 광으로 변환된 레이저비임은 상기 PBS블럭(24)을 통과한 다음 대물렌즈(26)을 매개하여 광자기디스크(20)상에 조사된다.According to the optical pickup apparatus of the magneto-optical disc reproducing system having the above structure, the laser beam radiated from the laser light source 21 is divided into three beams by the diffraction grating 22 and then the collimated lens 23. Is converted into parallel light, and the laser beam converted into the parallel light passes through the PBS block 24 and is then irradiated onto the magneto-optical disk 20 via the objective lens 26.

그 광자기디스크(20)에 조사된 레이저비임의 정보의 기록형태에 따라 반사되는 반사광은 상기 대물렌즈(25)를 통해 상기 PBS블럭(24)으로 반사되고, 그 PBS블럭(24)의 제1PBS코팅면(241)에 도달된 다음 수광소자(26)측을 향해 전향된다. 그 전향된 반사광은 그 PBS블럭(24)의 제2PBS코팅면(242)에서 일부는 통과되는 반면 나머지 일부는 반사되어 상기 홀로그램소자(244)측으로 진행하게 되고, 상기 제2PBS코팅면(242)을 통과한 상기 반사광의 나머지 부분은 전반사면(243)에서 반사되어 상기 홀로그램소자(244)측으로 반사되며, 그에 따라 그 홀로그램소자(244)는 상기 제2PBS코팅면(244)과 상기 전반사면(243)에서 반사딘 반사광에 대한 홀로그램작용을 발생하게 되며, 그 결과가 상기 수광소자(26)상에 집광되어 상기 광자기디스크에 정보를 기록하거나 그 광자기디스크에 기록된 정보를 독취하게 된다.Reflected light reflected in accordance with the recording form of the information of the laser beam irradiated to the magneto-optical disk 20 is reflected to the PBS block 24 through the objective lens 25, the first PBS of the PBS block 24 The coating surface 241 is reached and then turned toward the light receiving element 26 side. The redirected reflected light is partially passed through the second PBS coating surface 242 of the PBS block 24 while the other part is reflected to travel toward the hologram element 244, and the second PBS coating surface 242 is moved. The remaining portion of the reflected light passing through is reflected from the total reflection surface 243 and is reflected toward the hologram element 244. Accordingly, the hologram element 244 is the second PBS coated surface 244 and the total reflection surface 243. The hologram effect is generated on the reflected light reflected by the light beam, and the result is collected on the light receiving element 26 to record information on the magneto-optical disk or to read information recorded on the magneto-optical disk.

이상에서 설명한 바와 같이, 본 발명에 따른 광자기디스크재생시스템의 광픽업장치에 의하면, 광자기디스크를 억세스하기 위해 제1 및 제2PBS코팅면과 전반사면 및 홀로그램소자가 증착된 PBS블럭을 사용하여 광픽업장치에서의광효율이 대폭 증대될 뿐만 아니라 그 전체적인 치수 및 구성이 간단하게 된다.As described above, according to the optical pickup apparatus of the magneto-optical disk reproducing system according to the present invention, the PBS block on which the first and second PBS coating surfaces, the total reflection surface and the hologram elements are deposited is used to access the magneto-optical disk. Not only is the optical efficiency of the optical pickup device significantly increased, but its overall dimensions and configuration are simplified.

Claims (2)

레이저광원(21)에서 방사되어 회절격자(22)에 의해 3비임분할되고 콜리메이트렌즈(23)에 의해 평행광으로 변환된 레이저비임을 대물렌즈(25)를 매개하여 광자기디스크(20)상에 조사되도록 하거나 그 광자기디스크(20)상에서 반사되는 반사광을 수광소자(26)측으로 전달되도록 하는 PBS블럭(24)를 갖추어 구성되고, 상기 PBS블럭(24)은 상기 광자기디스크(20)으로부터 반사되는 반사광을 직각방향으로 전향시키는 제1PBS코팅면(241)과, 그 제1PBS코팅면(241)에서 전향된 상기 반사광의 일부는 통과시키는 반면 나머지 부분은 상기 수광소자(26)측으로 집광되록 하는 제2PBS코팅면(242), 상기 제2PBS코팅면(242)을 통과한 상기 반사광의 나머지부분을 상기 수광소자(26)측으로 집광되록 하는 전반사면(243) 및, 그 PBS블럭(24)의 저면에 형성되어 상기 반사광에 대한 홀로그램작용을 행하는 홀로그램소자면(244)을 갖추어 구성된 것을 특징으로 하는 광자기디스크재생시스템의 광픽업장치.The laser beam radiated from the laser light source 21 and sub-divided by the diffraction grating 22 and converted into parallel light by the collimated lens 23 is formed on the magneto-optical disk 20 via the objective lens 25. A PBS block 24 for irradiating the light or reflected light reflected on the magneto-optical disk 20 to the light-receiving element 26, and the PBS block 24 is provided from the magneto-optical disk 20. The first PBS coating surface 241 for redirecting the reflected reflected light in a perpendicular direction, and a portion of the reflected light redirected from the first PBS coating surface 241 is passed while the remaining portion is focused on the light receiving element 26 side. A total reflection surface 243 for condensing the remaining portion of the reflected light passing through the second PBS coating surface 242 and the second PBS coating surface 242 toward the light receiving element 26; and a bottom surface of the PBS block 24; Is formed in the hologram for the reflected light An optical pickup apparatus for a magneto-optical disc reproducing system, comprising: a holographic element surface 244 to be executed. 제1항에 있어서, 상기 홀로그램소자면(244)은 상기 제2PBS코팅면(242)과 상기 전반사면(243)에서 반사되는 반사광에 대한 홀로그램작용이 이루어지도록 상기 제2PBS코팅면(242)과 상기 전반사면(243)의 하측에 증착형성된 것을 특징으로 하는 광자기디스크재생시스템의 광픽업장치.The method of claim 1, wherein the hologram element surface 244 is the second PBS coating surface 242 and the second PBS coating surface 242 and the total reflection surface 243 so as to perform a hologram action to the reflected light reflected An optical pickup apparatus for a magneto-optical disc reproducing system, characterized in that it is formed below the total reflection surface (243).
KR1019940017628A 1994-07-21 1994-07-21 Optical pick-up device KR970005986B1 (en)

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