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KR100268034B1 - Micro optical pickup apparatus - Google Patents

Micro optical pickup apparatus Download PDF

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Publication number
KR100268034B1
KR100268034B1 KR1019970078368A KR19970078368A KR100268034B1 KR 100268034 B1 KR100268034 B1 KR 100268034B1 KR 1019970078368 A KR1019970078368 A KR 1019970078368A KR 19970078368 A KR19970078368 A KR 19970078368A KR 100268034 B1 KR100268034 B1 KR 100268034B1
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South Korea
Prior art keywords
recording medium
lens
substrate
optical pickup
optical
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Expired - Fee Related
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KR1019970078368A
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Korean (ko)
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KR19990058277A (en
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김성민
이계한
이해룡
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김덕중
사단법인고등기술연구원연구조합
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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
    • G11B7/12—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
    • G11B7/13—Optical detectors therefor
    • 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
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE: An optical pickup device of compact size is provided to record data on a recording medium at a high speed and to reproduce the data from the recording medium. CONSTITUTION: An optical beam(210) radiated from a light source(200) such as a laser diode is reflected and diffracted on gratings of a reflecting surface(520) and a diffracting surface(530) of a lens surface. The optical beam penetrates a refraction surface(510) of a lens(500) and a substrate(100) for being inputted to a recording medium(400). The optical beam inputted and reflected on the recording medium penetrates the substrate and the refraction surface of the lens. The optical beam is inputted to the gratings of the reflecting surface and the diffracting surface. The optical beam is diffracted on the gratings for being inputted to an optical detector(300). The optical detector demodulates the input beam for reproducing into an original signal.

Description

초소형 광 픽업 장치Micro Optical Pickup Device

본 발명은 광 픽업 장치에 관한 것으로, 보다 상세하게는 기록 매체에 정보를 기록하고 재생하는 시간을 향상시킬 수 있는 초소형 광 픽업 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device, and more particularly, to an ultra-small optical pickup device capable of improving the time for recording and reproducing information on a recording medium.

일반적으로, 광디스크 플레이어는 디스크에 새겨진 기록 비트 신호를 레이저빔에 의해 비접촉 재생하고 이를 디지탈 신호처리하는 시스템이다. 이러한 광디스크 시스템에 있어서, 특히 광픽업 유니트는 디스크의 신호면에 레이저빔을 입사한후, 디스크의 신호면으로부터 반사되어 오는 광을 전기적 신호로 변환하는 기능을 수행한다.In general, an optical disc player is a system for non-contact reproduction of a recording bit signal engraved on a disc by a laser beam and digital signal processing thereof. In such an optical disk system, in particular, the optical pickup unit performs a function of converting light reflected from the signal surface of the disk into an electrical signal after the laser beam is incident on the signal surface of the disk.

도 1에 도시된 광 픽업 장치는 레이저 다이오드로 구성된 광원(10)에서 발생된 소정의 발진 파장을 갖는 레이저 빔은 콜리메이터 렌즈(12)을 통과하면서 평행광으로 발생된다. 이와 같이, 평행광으로서 직선성이 유지된 빔의 일부는 빔 스플리트(14)에서 반사되기도하고 일부는 빔 스플리트(14)를 통과하여 대물 렌즈(16)로 입사되고, 이 대물 렌즈(16)에 의해 광 디스크인 기록 매체(20)의 기록면에 포커싱되어 디스크에 기록된 정보를 읽게된다. 이때 기록 매체(20)에 포커싱된 광은 그 기록면으로부터 반사되어 빔 스플리트(14)에서 필드 렌즈(18)로 반사되고, 필드 렌즈(18)를 거쳐 광 검출기(22)로 입사된다. 광 검출기(22)는 입사된 빔을 복조하여 원래의 신호로 재생한다.In the optical pickup device shown in FIG. 1, a laser beam having a predetermined oscillation wavelength generated by the light source 10 composed of a laser diode is generated as parallel light while passing through the collimator lens 12. In this way, a part of the beam in which linearity is maintained as parallel light is reflected by the beam split 14, and a part passes through the beam split 14 and is incident on the objective lens 16, and the objective lens 16 Is focused on the recording surface of the recording medium 20, which is an optical disk, to read information recorded on the disk. At this time, the light focused on the recording medium 20 is reflected from the recording surface, reflected by the beam split 14 to the field lens 18, and is incident on the photo detector 22 via the field lens 18. The photo detector 22 demodulates the incident beam and reproduces the original signal.

근래에, 노트북 퍼스널 컴퓨터, 휴대용 광 디스크 장치등이 보급되면서 광 디스크 플레이어의 소형화가 요구되는 추세이다. 또한 광 디스크 플레이어가 고속화됨에 따라 광 디스크 플레이어의 정보 탐색 시간의 단축이 요구되고 있다. 그러나, 상술한 구성을 갖는 전형적인 광 픽업 장치는 하드 디스크 드라이브(hard disk drive)헤드에 비하여 부피 및 중량이 커서 광 디스크 플레이어의 소형화와 정보 탐색 시간의 단축이 어렵다는 단점을 가지고 있다.In recent years, as notebook personal computers, portable optical disk devices, and the like have become widespread, miniaturization of optical disk players is required. In addition, as the optical disc player becomes faster, it is required to shorten the information search time of the optical disc player. However, a typical optical pickup device having the above-described configuration has a disadvantage in that it is difficult to miniaturize the optical disk player and shorten the information search time, because the volume and the weight are larger than those of the hard disk drive head.

그러므로, 본 발명은 광 디스크와 같은 기록 매체에 고속으로 정보를 기록하고 그로부터 정보를 재생할 수 있는 초소형 광 픽업 장치를 제공하는 것을 그 목적으로한다.Therefore, an object of the present invention is to provide a micro optical pickup device capable of recording information on a recording medium such as an optical disk at high speed and reproducing the information therefrom.

상술한 목적을 달성하기위한 본 발명에 따라서 구성된 초소형 광 픽업 장치는: 광빔에 투명한 기판; 상기 기판상에 장착된 광원; 상기 기판상에 장착되어 상기 기록 매체로부터 반사된 광 빔으로부터 정보를 재생하는 광 검출기; 상기 광원과 광 검출기를 엔벨로프 형태로 에워싸고 있는 렌즈로서, 상기 렌즈는 상기 기판과 접하는 굴절면과 상기 굴절면과 대향하는 반구형 표면상에 형성되어 상기 광원으로부터 방사된 광빔을 상기 기록 매체로 반사 및 회절시키고, 상기 기록 매체로부터 반사된 빔을 상기 광 검출기로 반사 및 회절시키는 반사면 및 회절면의 그레이팅(grating) 구조를 가지는 것을 특징으로 한다.A microscopic optical pickup device constructed according to the present invention for achieving the above object comprises: a substrate transparent to a light beam; A light source mounted on the substrate; A photo detector mounted on the substrate to reproduce information from the light beam reflected from the recording medium; An lens enveloping the light source and the light detector in an envelope form, the lens being formed on a refractive surface in contact with the substrate and a hemispherical surface opposite the refractive surface to reflect and diffract the light beam emitted from the light source onto the recording medium; And a grating structure of the reflection surface and the diffraction surface for reflecting and diffracting the beam reflected from the recording medium to the light detector.

도 1은 종래 기술의 일반적인 광 픽업 장치의 구성도,1 is a block diagram of a conventional optical pickup device of the prior art,

도 2는 본 발명의 일실시예에 따라서 구성된 광 픽업 장치의 구성을 도시하는 도면.2 is a diagram showing a configuration of an optical pickup device constructed in accordance with an embodiment of the present invention.

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

100 : 기판 200 : 광원100: substrate 200: light source

300 : 광 검출기 500 : 렌즈300: light detector 500: lens

510 : 굴절면 520, 530 : 그레이팅510: refractive surface 520, 530: grating

이하 첨부된 도면을 참조하여 본 발명의 바람직한 실시예에 대하여 상세하게 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2를 참조하면, 본 발명에 따라서 구성된 초소형 광 픽업 장치가 도시된다.2, a micro optical pickup device constructed in accordance with the present invention is shown.

본 발명의 광 픽업 장치는 기판(100), 에어 베어링 슬라이더(150), 광원(200), 광 검출기(300) 및 렌즈(500)를 포함한다.The optical pickup apparatus of the present invention includes a substrate 100, an air bearing slider 150, a light source 200, a light detector 300, and a lens 500.

기판(100)은 기록 매체(400)로 지향되는 광 빔과 기록 매체(400)로부터 반사되는 광 빔이 투과될 수 있는 투명한 물질로 구성된다. 기판(100)상에는 광원(200)과 광 검출기(300)가 장착되어있으며, 대물 렌즈(500)는 기판(100)상에서 광원(200)과 광 검출기(300)를 엔벨로프 형태로 에워싸고 있다.The substrate 100 is made of a transparent material through which the light beam directed to the recording medium 400 and the light beam reflected from the recording medium 400 can be transmitted. The light source 200 and the photo detector 300 are mounted on the substrate 100, and the objective lens 500 encloses the light source 200 and the photo detector 300 in an envelope form on the substrate 100.

렌즈(500)는 기판(100)과 접하는 굴절면(510)과 굴절면(510)과 대향하는 렌즈 표면상에 형성되어 광원(200)으로부터 방사된 광빔을 기록 매체(400)로 반사 및 회절시키고, 기록 매체(400)로부터 반사된 빔을 광 검출기(300)로 반사 및 회절시키는 반사면(520) 및 회절면(530)의 그레이팅(grating) 구조를 갖는 대물 렌즈로서의 기능을 수행한다.The lens 500 is formed on the refractive surface 510 in contact with the substrate 100 and the lens surface opposite the refractive surface 510 to reflect and diffract the light beam emitted from the light source 200 onto the recording medium 400, and to record It functions as an objective lens having a grating structure of the reflection surface 520 and the diffraction surface 530 that reflects and diffracts the beam reflected from the medium 400 to the photo detector 300.

상술한 구성을 갖는 본 발명의 광 픽업 장치의 동작을 설명하면 다음과 같다.The operation of the optical pickup device of the present invention having the above-described configuration will be described below.

먼저, 광원(200), 예로 레이저 다이오드로부터 방사된 광 빔(210)은 렌즈(500)의 렌즈 표면상의 반사면(520) 및 회절면(530)의 그레이팅에서 반사 및 회절되어 렌즈(500)의 굴절면(510)과 기판(100)을 투과하여 기록 매체(400)로 입사된다.First, the light beam 210 emitted from the light source 200, for example, a laser diode, is reflected and diffracted in the gratings of the reflecting surface 520 and the diffraction surface 530 on the lens surface of the lens 500 to produce the lens 500. The refractive surface 510 and the substrate 100 penetrate and enter the recording medium 400.

기록 매체(400)에 입사되고 반사되는 광빔(210)은 기판(100)과 렌즈(500)의 굴절면(510)을 투과하여 다시 반사면(520) 및 회절면(530)의 그레이팅으로 입사되고, 그레이팅(520, 530)에서 회절되어 광 검출기(300)로 입사된다. 광 검출기(300)는 입사된 빔을 복조하여 원래의 신호로 재생한다.The light beam 210 incident and reflected on the recording medium 400 passes through the refractive surface 510 of the substrate 100 and the lens 500 and is incident again by the grating of the reflective surface 520 and the diffractive surface 530, Diffracted at the gratings 520, 530 and incident on the photo detector 300. The photo detector 300 demodulates the incident beam and reproduces the original signal.

그러므로, 본 발명에 따라서 구성된 광 픽업 장치는 하나의 기판상에 대물 렌즈로서 기능하는 그레이팅 렌즈와 광원 및 광 검출기를 구성함으로써 전형적인 광 픽업 장치에 비하여 간단하고 극히 작은 소형화를 이룰수 있으며, 광 기억 장치의 정보 전송 속도를 증가시킬 수 있는 장점이 제공된다.Therefore, the optical pickup device constructed in accordance with the present invention can achieve a simple and extremely small miniaturization compared to a typical optical pickup device by configuring a grating lens, a light source and an optical detector functioning as an objective lens on one substrate, The advantage is that the information transmission speed can be increased.

Claims (1)

기록 매체에 기록된 정보를 판독하는 광 픽업 장치에 있어서,An optical pickup apparatus for reading information recorded on a recording medium, 광빔에 투명한 기판;A substrate transparent to the light beam; 상기 기판상에 장착된 광원;A light source mounted on the substrate; 상기 기판상에 장착되어 상기 기록 매체로부터 반사된 광 빔으로부터 정보를 재생하는 광 검출기;A photo detector mounted on the substrate to reproduce information from the light beam reflected from the recording medium; 상기 광원과 광 검출기를 엔벨로프 형태로 에워싸고 있는 렌즈로서, 상기 렌즈는 상기 기판과 접하는 굴절면과 상기 굴절면과 대향하는 렌즈 표면상에 형성되어 상기 광원으로부터 방사된 광빔을 상기 기록 매체로 반사 및 회절시키고, 상기 기록 매체로부터 반사된 빔을 상기 광 검출기로 반사 및 회절시키는 반사면 및 회절면의 그레이팅(grating) 구조를 갖는 것을 특징으로하는 초소형 광 픽업 장치.An lens enveloping the light source and the photo detector in an envelope form, the lens being formed on a refractive surface in contact with the substrate and a lens surface opposite the refractive surface to reflect and diffract the light beam emitted from the light source to the recording medium; And a grating structure of a reflection surface and a diffraction surface for reflecting and diffracting the beam reflected from the recording medium to the light detector.
KR1019970078368A 1997-12-30 1997-12-30 Micro optical pickup apparatus Expired - Fee Related KR100268034B1 (en)

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KR100268034B1 true KR100268034B1 (en) 2000-10-16

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KR100455477B1 (en) * 2000-12-29 2004-11-08 엘지전자 주식회사 Optical pickup

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