KR20050003037A - Holographic rom system - Google Patents

Holographic rom system Download PDF

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Publication number
KR20050003037A
KR20050003037A KR1020030043164A KR20030043164A KR20050003037A KR 20050003037 A KR20050003037 A KR 20050003037A KR 1020030043164 A KR1020030043164 A KR 1020030043164A KR 20030043164 A KR20030043164 A KR 20030043164A KR 20050003037 A KR20050003037 A KR 20050003037A
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South Korea
Prior art keywords
optical
light
signal light
recording medium
mirror
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KR1020030043164A
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Korean (ko)
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KR100536685B1 (en
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조장현
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주식회사 대우일렉트로닉스
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Priority to KR10-2003-0043164A priority Critical patent/KR100536685B1/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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
    • 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
    • G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
    • 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
    • G11B7/1395—Beam splitters or combiners
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/13355—Polarising beam splitters [PBS]

Abstract

PURPOSE: A holographic ROM system is provided to change a path of a signal beam with an optical path changing unit consisting of the first and second ring-shaped prisms instead of an optical expander, so that the signal beam can be incident on a position of an optical recording medium where a reference beam is incident, thereby lowering a system manufacturing cost. CONSTITUTION: A light source(200) generates a laser beam. A PBS(Polarizer Beam Splitter)(206) separates the laser beam into a reference beam and a signal beam, and transmits the signal beam while reflecting the reference beam. The second reflecting mirror(220) radiates the reflected reference beam via the first and second optical paths. A conical mirror(222) controls an optical path of the reference beam, and radiates the controlled reference beam on an optical recording medium(224). The third reflecting mirror(210) reflects the transmitted signal beam to the third optical path. The first ring-shaped prism(212a) refracts the signal beam reflected by the third reflecting mirror(210). The second ring-shaped prism(212b) refracts the refracted signal beam in a position corresponding to an area of the medium(224). A mask(226) modulates the refracted signal beam, and radiates the modulated beam on the medium(224).

Description

홀로그래픽 롬 시스템{HOLOGRAPHIC ROM SYSTEM}Holographic ROM System {HOLOGRAPHIC ROM SYSTEM}

본 발명은 홀로그래픽 롬 시스템에 관한 것으로, 특히, 신호광의 경로 변경을 통해 시스템의 제조 단가를 낮출 수 있는 홀로그래픽 롬 시스템에 관한 것이다.The present invention relates to a holographic ROM system, and more particularly, to a holographic ROM system that can reduce the manufacturing cost of the system by changing the path of the signal light.

도 1은 종래의 전형적인 홀로그래픽 롬 시스템의 구성도로서, 광원(100), HWP(Half Wave Plate)(102, 112), 광 확장기(beam expander)(104, 112), 편광 분리기(Polarizer Beam Splitter)(106), 편광기(108, 114), 반사 미러(110, 118, 120), 코니컬 미러(122), 마스크(124), 광 기록 매체(126)를 포함한다.1 is a block diagram of a conventional typical holographic ROM system, which includes a light source 100, a half wave plate (HWP) 102 and 112, a beam expander 104 and 112, and a polarizer beam splitter. ) 106, polarizers 108, 114, reflective mirrors 110, 118, 120, conical mirror 122, mask 124, and optical recording medium 126.

광원(100)은 일정 파장, 예컨대, 532nm의 파장을 갖는 레이저 원으로서, 홀로그래픽에 요구되는 레이저광을 발생시킨다.The light source 100 is a laser source having a predetermined wavelength, for example, a wavelength of 532 nm, and generates laser light required for holography.

광원(100)으로부터 발생된 레이저광은 HWP(102), 광 확장기(104) 등을 거쳐 편광 분리기(106)로 제공된다.The laser light generated from the light source 100 is provided to the polarization separator 106 via the HWP 102, the light expander 104, and the like.

편광 분리기(106)는 굴절률이 서로 상이한 두 종류 이상의 물질을 반복적으로 증착한 구조로서, 신호광은 투과시키고 기준광은 반사시키는 역할을 수행한다.The polarization separator 106 is a structure in which two or more kinds of materials having different refractive indices are repeatedly deposited, and transmits signal light and reflects reference light.

편광 분리기(106)를 투과한 신호광은 편광기(108)를 거쳐 반사 미러(110)에서 반사된다. 이때 홀로그래픽 롬 시스템은 반사 미러(110)에서 반사된 신호광을 광 기록매체(120)의 기록영역(기준광이 입사되는 영역)에 입사시키기 위해서 광 경로 변경이 필요하며, 이런 이유로 반사 미러(210)와 마스크(124) 사이에 광 확장기(112)를 설치한다.The signal light transmitted through the polarization separator 106 is reflected by the reflection mirror 110 via the polarizer 108. In this case, the holographic ROM system needs to change the optical path in order to enter the signal light reflected by the reflective mirror 110 into the recording area (the area where the reference light is incident) of the optical recording medium 120. For this reason, the reflective mirror 210 The optical expander 112 is installed between the mask and the mask 124.

반사 미러(112)에서 반사된 신호광은 광 확장기(112)에 의해서 확장되며, 확장된 신호광은 마스크(124)에 의해 소정 패턴으로 변조되어 광 기록매체(120)에 조사된다.The signal light reflected by the reflection mirror 112 is extended by the optical expander 112, and the expanded signal light is modulated in a predetermined pattern by the mask 124 and irradiated to the optical recording medium 120.

이때, 광 확장기(112)는 임의의 직경을 갖는 다수의 렌즈들로 구성되는 링 형태를 가지며, 반사된 신호광을 광 기록매체(126) 크기의 두 배 정도로 확장시킬수 있어야 한다. 예를 들어 홀로그래픽 롬 시스템에서 광의 직경이 120mm인 신호광을 광 기록매체(126)에 조사하기 위해서 렌즈의 직경이 200mm 정도로 크게 한 다수의 렌즈의 조합으로 된 광 확장기가 필요하다.At this time, the optical expander 112 has a ring shape consisting of a plurality of lenses having an arbitrary diameter, and should be able to expand the reflected signal light to about twice the size of the optical recording medium 126. For example, in the holographic ROM system, in order to irradiate the optical recording medium 126 with signal light having a diameter of 120 mm, an optical expander including a combination of a plurality of lenses having a diameter of about 200 mm is required.

편광 분리기(106)를 통해 반사된 기준광은 HWP(114), 편광기(116)를 거쳐 반사 미러(118, 112)에서 반사되어 코니컬 미러(122)로 조사된다.The reference light reflected by the polarization separator 106 is reflected by the reflection mirrors 118 and 112 via the HWP 114 and the polarizer 116 and irradiated to the conical mirror 122.

이러한 코니컬 미러(120)는 홀로그래픽 롬 시스템의 재생시 동일 각도에서 재생이 가능하도록 조절하는 수단으로서, 다른 각도를 갖는 코니컬 미러를 이용하여 재생 각도의 다중화가 가능하다.The conical mirror 120 is a means for adjusting the reproduction at the same angle when the holographic ROM system is reproduced, and multiplexes the reproduction angles using conical mirrors having different angles.

이와 같이, 홀로그래픽 롬 시스템은 광 확장기(112)에 의해서 확장되며 마스크(124)에 의해 변조된 신호광과 코니컬 미러(120)를 통해 입사되는 기준광간의 간섭에 의해 생기는 간섭 무늬를 광 기록매체(126)에 기록한다.In this way, the holographic ROM system is extended by the optical expander 112, and the interference fringe generated by the interference between the signal light modulated by the mask 124 and the reference light incident through the conical mirror 120, the optical recording medium. Record at 126.

그러나, 상술한 바와 같이, 종래의 홀로그래픽 롬 시스템은 신호광의 직경을 광 기록매체 크기의 두 배로 확장시키기 위해서 직경이 200mm 정도인 다수의 렌즈를 구성된 광 확장기가 필요한데, 이러한 광 확장기는 제조 비용이 많이 들어가기 때문에 전체적으로 시스템의 제조 단가를 높이는 문제점이 있다.However, as described above, the conventional holographic ROM system requires an optical expander composed of a plurality of lenses having a diameter of about 200 mm in order to expand the diameter of the signal light to twice the size of the optical record carrier. There is a problem to increase the manufacturing cost of the system as a whole because of a lot.

따라서, 본 발명은 상술한 문제를 해결하기 위해 안출한 것으로, 신호광을 확장시키는 광 확장기 대신에 신호광의 경로를 변경할 수 있는 코니컬 미러와 환형 미러를 적용함으로써, 시스템의 제조 단가를 낮출 수 있는 홀로그래픽 롬 시스템을 제공하는데 그 목적이 있다.Accordingly, the present invention has been made to solve the above-described problem, and by using a conical mirror and an annular mirror that can change the path of the signal light instead of an optical expander that extends the signal light, the manufacturing cost of the system can be lowered alone. Its purpose is to provide a graphical ROM system.

이러한 목적을 달성하기 위하여 본 발명은, 홀로그래픽 롬 시스템(Holographic ROM system)에 있어서, 홀로그래픽에 요구되는 레이저광을 발생시키는 광원과, 상기 광원으로부터 발생된 레이저광을 신호광과 기준광으로 분리시키되, 상기 신호광은 투과시키고 상기 기준광은 반사시키는 편광 분리기(Polarizer Beam Splitter)와, 상기 편광 분리기를 통해 반사된 기준광을 제 1 및 제 2 광경로를 거쳐 조사하는 제 2 반사 미러와, 상기 제 2 반사 미러에서 반사되는 기준광의 광경로를 굴절률에 의해 조절하여 상기 광 기록매체에 조사하는 코니컬 미러와, 상기 편광 분리기를 통해 투과된 신호광을 제 3 광경로로 반사시키는 제 3 반사 미러와, 상기 제 3 반사 미러에 의해 반사된 신호광을 굴절율에 따라 굴절시키는 제 1 환형 프리즘과, 상기 제 1 환형 프리즘에서 굴절되는 신호광을 상기 기준광이 입사되는 광 기록매체 영역에 대응되는 위치로 굴절시키는 제 2 환형 프리즘과, 상기 제 2 환형 프리즘에서 굴절되는 신호광을 소정 데이터 패턴으로 변조하여 상기 광 기록매체에 조사하는 마스크를 구비한다.In order to achieve the above object, the present invention, in the holographic ROM system, the light source for generating a laser light required for the holographic and the laser light generated from the light source is separated into a signal light and a reference light, A polarizer beam splitter that transmits the signal light and reflects the reference light, a second reflection mirror that irradiates the reference light reflected through the polarization splitter through first and second optical paths, and the second reflection mirror A conical mirror that adjusts the optical path of the reference light reflected by the refractive index to the optical record carrier, a third reflective mirror that reflects the signal light transmitted through the polarization splitter to the third optical path, and the third A first annular prism that refracts the signal light reflected by the reflection mirror according to the refractive index, and is refracted by the first annular prism And a second annular prism that refracts signal light to a position corresponding to an area of the optical recording medium on which the reference light is incident, and a mask that modulates the signal light refracted by the second annular prism into a predetermined data pattern to irradiate the optical recording medium. do.

도 1은 종래의 전형적인 홀로그래픽 롬 시스템의 구성도이고,1 is a block diagram of a typical holographic ROM system according to the related art,

도 2는 본 발명의 바람직한 실시예에 따른 홀로그래픽 롬 시스템의 구성도이다.2 is a block diagram of a holographic ROM system according to a preferred embodiment of the present invention.

＜도면의 주요부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>

200 : 광원 202, 214 : HWP200: light source 202, 214: HWP

204 : 광 확장기 206 : 편광 분리기204: optical expander 206: polarization separator

208, 216 : 편광기 210 : 제 3 반사 미러208, 216: polarizer 210: third reflection mirror

218 : 제 1 반사 미러 220 : 제 2 반사 미러218: first reflective mirror 220: second reflective mirror

212a, 212b : 제 1, 2 환형 프리즘 212 : 광 경로 변경 수단212a, 212b: first and second annular prisms 212: optical path changing means

222 : 코니컬 미러 224 : 광 기록매체222 conical mirror 224 optical recording medium

226 : 마스크226: mask

본 발명의 상기 및 기타 목적과 여러 가지 장점은 이 기술분야에 숙련된 사람들에 의해 첨부된 도면을 참조하여 하기에 기술되는 본 발명의 바람직한 실시 예로부터 더욱 명확하게 될 것이다.The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예에 대하여 상세하게 설명한다. 도 2는 본 발명의 바람직한 실시 예에 따른 홀로그래픽 롬 시스템의 구성도이다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. 2 is a block diagram of a holographic ROM system according to a preferred embodiment of the present invention.

도 2는 본 발명의 바람직한 실시예에 따른 홀로그래픽 롬 시스템의 구성도로서, 광원(200), HWP(202, 214), 광 확장기(204), 편광 분리기(206), 편광기(208, 216), 제 1, 2, 3 반사 미러(210, 218, 220), 광 경로 변경 수단(212), 코니컬 미러(222), 광 기록매체(224), 마스크(226)를 포함한다.2 is a block diagram of a holographic ROM system according to a preferred embodiment of the present invention, which includes a light source 200, HWPs 202 and 214, an optical expander 204, a polarization splitter 206, and polarizers 208 and 216. And first, second and third reflection mirrors 210, 218 and 220, optical path changing means 212, conical mirror 222, optical record carrier 224 and mask 226.

본 발명에서는 종래의 광 확장기 대신에 광 경로 변경 수단(212)을 사용하여 반사 미러(210)에서 반사된 신호광의 경로를 변경시켜 기준광이 입사되는 광 기록매체(224)의 영역에 입사시킨다는 것으로, 광 경로 변경 수단(212)은 두개의 환형 프리즘(212a, 212b)으로 이루어져 있다.According to the present invention, instead of the conventional optical expander, the optical path changing means 212 is used to change the path of the signal light reflected by the reflection mirror 210 to enter the region of the optical recording medium 224 into which the reference light is incident. The light path changing means 212 consists of two annular prisms 212a and 212b.

광원(200)은 일정 파장인 532nm의 파장을 갖는 레이저 원으로서, 홀로그래픽에 요구되는 레이저광을 발생시키고, 레이저 광은 HWP(202), 광 확장기(204) 등을 거쳐 편광 분리기(206)로 제공된다.The light source 200 is a laser source having a wavelength of 532 nm, which is a predetermined wavelength, and generates laser light required for holography, and the laser light is passed through the HWP 202, the light expander 204, and the like to the polarization separator 206. Is provided.

편광 분리기(206)는 굴절률이 서로 상이한 두 종류 이상의 물질을 반복적으로 증착한 구조로서, 광원(200)에서 발생된 레이저 광을 신호광과 기준광으로 분리시킨다. 이때 편광 분리기(206)를 투과한 신호광은 제 3 광경로를 통해 제 3 반사 미러(210)에 제공되고, 편광 분리기(206)에서 반사된 기준광은 제 1, 2 광경로를 통해 제 2 반사 미러(220)에 제공된다.The polarization separator 206 is a structure in which two or more kinds of materials having different refractive indices are repeatedly deposited. The polarization separator 206 separates the laser light generated from the light source 200 into signal light and reference light. In this case, the signal light transmitted through the polarization separator 206 is provided to the third reflection mirror 210 through the third optical path, and the reference light reflected by the polarization separator 206 is the second reflection mirror through the first and second optical paths. And provided at 220.

편광 분리기(206)를 통해 반사된 기준광은 제 1 및 제 2 광경로를 통해 코니컬 미러(222)에 조사된다. 이때, 제 1 광 경로 상에는 HWP(214), 편광기(216)를 거쳐 제 1 반사 미러(218)가 있으며, 제 1 반사 미러(218)는 편광 분리기(206)에서 반사된 기준광을 소정 방향으로 편향시켜 제 2 광경로로 제공한다. 제 2 광경로에는 제 2 반사 미러(220)가 설치되어 있으며, 제 2 반사 미러(220)는 제 1 반사 미러(218)에서 편향되어 입사되는 기준광을 반사시켜 코니컬 미러(222)에 조사시킨다.The reference light reflected through the polarization separator 206 is irradiated to the conical mirror 222 through the first and second optical paths. In this case, a first reflection mirror 218 is provided on the first optical path through the HWP 214 and the polarizer 216, and the first reflection mirror 218 deflects the reference light reflected by the polarization separator 206 in a predetermined direction. To provide the second optical path. A second reflective mirror 220 is provided in the second optical path, and the second reflective mirror 220 reflects the reference light that is deflected from the first reflective mirror 218 and irradiates the conical mirror 222. .

코니컬 미러(222)는 제 2 반사 미러(220)에서 반사된 기준광을 모두 동일한 각도를 가지면서 평행이 되도록 반사시켜 광 기록매체(224)에 입사시킨다. 즉, 광 기록매체(224)에는 코니컬 미러(222)를 통해 모두 동일한 각도로 평행으로 퍼져나온 기준광이 입사된다.The conical mirror 222 reflects the reference light reflected by the second reflection mirror 220 to be parallel to each other at the same angle and enters the optical recording medium 224. That is, the reference light, which is spread out in parallel at the same angle, is incident on the optical recording medium 224 through the conical mirror 222.

편광 분리기(206)를 투과한 신호광은 제 3 광경로 상에 설치된 편광기(208)를 거쳐 제 3 반사 미러(210)에서 반사되어 광 경로 변경 수단(212)에 조사된다.The signal light transmitted through the polarization separator 206 is reflected by the third reflection mirror 210 via the polarizer 208 provided on the third optical path and irradiated to the optical path changing means 212.

광 경로 변경 수단(212)은, 도 3에 도시된 바와 같이, 제 1, 2 환형 프리즘(212a, 212b)으로 이루어져 있으며, 제 1 환형 프리즘(212a)은 신호광의 광 축상에 설치되어 굴절율에 따라 제 3 반사 미러(210)를 통해 입사되는 신호광을 제 2 환형 프리즘(212b)으로 굴절시킨다.As shown in FIG. 3, the optical path changing means 212 is composed of first and second annular prisms 212a and 212b, and the first annular prism 212a is provided on the optical axis of the signal light and according to the refractive index. The signal light incident through the third reflection mirror 210 is refracted by the second annular prism 212b.

제 2 환형 프리즘(212b)은 제 1 환형 프리즘(212a)에서 굴절되어 입사되는 신호광을 기준광이 입사되는 광 기록매체(224)의 영역에 대응되는 위치로 굴절시킨다.The second annular prism 212b refracts the signal light refracted by the first annular prism 212a to a position corresponding to the area of the optical recording medium 224 on which the reference light is incident.

이와 같이, 본 발명에 따른 홀로그래픽 롬 시스템은 제 1, 2 환형 프리즘(212a, 212b)을 이용하여 신호광의 광 경로를 변경시킴으로써, 신호광을 광 기록매체(224)의 기록영역, 즉 코니컬 미러(222)에 의해 반사된 기준광이 입사되는 영역에 입사시킬 수 있다.As described above, the holographic ROM system according to the present invention uses the first and second annular prisms 212a and 212b to change the optical path of the signal light so that the signal light is recorded in the recording area of the optical recording medium 224, that is, the conical mirror. The reference light reflected by 222 may be incident on the incident area.

제 2 환형 프리즘(212b)에 의해 굴절된 신호광은 마스크(226)를 통해 변조되어 광 기록매체(224)에 입사된다. 즉, 신호광은 제 1, 2 환형 프리즘(212a, 212b)으로 이루어진 광 경로 변경 수단(212)에 의해서 광 경로가 변경되고, 이에 따라 기준광이 입사되는 광 기록매체(226)의 영역에 대응되는 위치에 입사되게 된다.The signal light refracted by the second annular prism 212b is modulated through the mask 226 and is incident on the optical recording medium 224. That is, the optical path of the signal light is changed by the optical path changing means 212 including the first and second annular prisms 212a and 212b, and thus the position corresponding to the area of the optical recording medium 226 to which the reference light is incident. Will be incident on.

광 기록매체(224) 상에는 이와 같은 광 경로를 통해 제공되는 신호광과 코니컬 미러(222)에 의해 소정 각도로 반사된 기준광간의 간섭에 의해 생성되는 간섭 무늬가 기록된다.On the optical record carrier 224, an interference fringe generated by interference between signal light provided through such an optical path and reference light reflected at a predetermined angle by the conical mirror 222 is recorded.

따라서 본 발명은 광 확장기 대신에 제 1, 2 환형 프리즘으로 이루어진 광 경로 변경 수단으로 신호광의 경로를 변경하여 신호광을 기준광이 입사되는 광 기록매체의 영역에 대응되는 위치에 입사시킴으로써, 시스템의 제조 단가를 낮출 수 있다.Therefore, the present invention changes the path of the signal light by means of optical path changing means composed of first and second annular prisms instead of the optical expander, thereby injecting the signal light into a position corresponding to the area of the optical recording medium on which the reference light is incident, thereby producing the system. Can be lowered.

이상, 본 발명을 실시예에 근거하여 구체적으로 설명하였지만, 본 발명은 이러한 실시예에 한정되는 것이 아니라, 하기에 기술하는 특허청구범위의 요지를 벗어나지 않는 범위내에서 여러 가지 변형이 가능한 것은 물론이다.As mentioned above, although this invention was demonstrated concretely based on the Example, this invention is not limited to this Example, Of course, various changes are possible within the range which does not deviate from the summary of the claim described below. .

Claims (1)

홀로그래픽 롬 시스템(Holographic ROM system)에 있어서,In holographic ROM system, 홀로그래픽에 요구되는 레이저광을 발생시키는 광원과,A light source for generating laser light required for holographic, 상기 광원으로부터 발생된 레이저광을 기준광과 신호광으로 분리시키되, 상기 신호광은 투과시키고 상기 기준광은 반사시키는 편광 분리기(Polarizer Beam Splitter)와,A polarizer beam splitter for separating the laser light generated from the light source into a reference light and a signal light, and transmitting the signal light and reflecting the reference light; 상기 편광 분리기를 통해 반사된 기준광을 제 1 및 제 2 광경로를 거쳐 조사하는 제 2 반사 미러와,A second reflection mirror that irradiates the reference light reflected through the polarization separator through the first and second optical paths; 상기 제 2 반사 미러에서 반사되는 기준광의 광경로를 굴절률에 의해 조절하여 상기 광 기록매체에 조사하는 코니컬 미러와,A conical mirror configured to irradiate the optical recording medium by adjusting an optical path of the reference light reflected by the second reflective mirror by a refractive index; 상기 편광 분리기를 통해 투과된 신호광을 제 3 광경로로 반사시키는 제 3 반사 미러와,A third reflecting mirror reflecting the signal light transmitted through the polarization splitter in a third optical path; 상기 제 3 반사 미러에 의해 반사된 신호광을 굴절율에 따라 굴절시키는 제 1 환형 프리즘과,A first annular prism that refracts the signal light reflected by the third reflection mirror according to a refractive index; 상기 제 1 환형 프리즘에서 굴절되는 신호광을 상기 기준광이 입사되는 광 기록매체 영역에 대응되는 위치로 굴절시키는 제 2 환형 프리즘과,A second annular prism refracting the signal light refracted by the first annular prism to a position corresponding to an area of the optical recording medium on which the reference light is incident; 상기 제 2 환형 프리즘에서 굴절되는 신호광을 소정 데이터 패턴으로 변조하여 상기 광 기록매체에 조사하는 마스크A mask for modulating the signal light refracted by the second annular prism into a predetermined data pattern to irradiate the optical recording medium 를 구비하는 홀로그래픽 롬 시스템.Holographic ROM system having a.
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Publication number Priority date Publication date Assignee Title
KR20190044564A (en) * 2017-10-20 2019-04-30 주식회사 엘지화학 Optical isolating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190044564A (en) * 2017-10-20 2019-04-30 주식회사 엘지화학 Optical isolating device
US10996384B2 (en) 2017-10-20 2021-05-04 Lg Chem, Ltd. Optical isolation element

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