CN1108608C - 光学拾取设备 - Google Patents

光学拾取设备 Download PDF

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CN1108608C
CN1108608C CN97125349A CN97125349A CN1108608C CN 1108608 C CN1108608 C CN 1108608C CN 97125349 A CN97125349 A CN 97125349A CN 97125349 A CN97125349 A CN 97125349A CN 1108608 C CN1108608 C CN 1108608C
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light
light source
recording medium
optical
optical pick
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CN1184309A (zh
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金周晔
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Toshiba Samsung Storage Technology Korea Corp
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Samsung Electronics Co Ltd
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125Optical 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
    • G11B7/127Lasers; Multiple laser arrays
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/123Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125Optical 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
    • G11B7/126Circuits, methods or arrangements for laser control or stabilisation
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353Diffractive elements, e.g. holograms or gratings
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365Separate or integrated refractive elements, e.g. wave plates

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

一个光学拾取设备,它包括:有两个光源的光学模块器件;放在光学模块器件与记录介质之间光路上的光折变晶体器件;以及放在光折变晶体器件与记录介质之间光路上的物镜;光学模块器件包括:衬底;安装在衬底上的支架;安装在支架相对两侧的第一光源和第二光源;安装在支架上的光电检测器;带开孔的外壳;以及安装在外壳开孔处的光路改变单元,用于改变入射光束的路程。

Description

光学拾取设备
技术领域
本发明涉及记录和/或再现光记录介质上各种类型信息的光学拾取设备,更具体地是,本发明涉及采用有两个不同功率光源的光学模块器件的光学拾取设备。
背景技术
参照图1,普通全息拾取设备包括光学模块和物镜16,光学模块是由发射光束的光源12和检测来自光记录介质反射光束的光电检测器17构成的整体,物镜16把光源12射出的光束会聚到光记录介质1上。
上述光学模块包括衬底2和外壳3。光源12安装在支架11的一侧,支架11安装在外壳3内衬底2上。光电检测器17安装在支架11上,当光束从光记录介质1反射时,光电检测器17测量误差信号和射频信号。在这个实例中,采用边缘射出光的激光器作为光源12。
两支光束从光源12的相反方向射出,一支光束射向物镜16,另一支光束射向监视光电检测器13,此监视光电检测器13安装在衬底2上。光源12的辐射功率是按照入射到监视光电检测器13上光束加以控制的。全息元件15和光栅14嵌入外壳3开孔内。全息元件15准许来自光源12的入射光束直进地传播,并把从光记录介质1反射的光束衍射到光电检测器17。光栅14衍射和透射来自光源12的入射光束,形成零级光束,±1级光,等等。所以,利用三光束方法由光电检测器17检测跟踪误差信号是可能的。
上述结构的普通光学拾取设备利用一个光学模块和一个物镜16,该光学拾取设备具有结构简单的优点。另一方面,由于在记录介质上记录信息所需光源12的功率与从记录介质再现信息所需光源12的功率是不同的。普通光学拾取设备的缺点是,必须采用适当的电路调节光源12的功率。
发明内容
为了解决以上问题,本发明的目的是提供有两个光源的光学拾取设备,两个光源在同一外壳内发射功率不同的两支光束。
为了达到上述目的,于是,光学拾取设备包括光学模块器件,光折变晶体器件和物镜,光学模块器件有两个光源,用于发射两个不同功率的光束;光折变晶体器件放在光学模块器件与记录介质之间的光路上,用于耦合从两个光源射出的光束功率;物镜放在所述光折变晶体器件与记录介质之间的光路上,用于把两个光源射出的光束聚焦到记录介质。光学模块器件包括衬底,安装在衬底上的支架;安装在支架相对两侧的第一光源和第二光源;安装在支架上的光电检测器,用于接收记录介质反射的光束;带开孔的外壳,开孔在外壳的上部,外壳与衬底的上表面粘合;以及安装在外壳开孔处的光路改变单元,用于改变入射光束的路程。
该光学拾取设备还包括第一和第二监视光电检测器,它们安装在衬底的上表面,两个监视光电检测器分别检测从第一光源和第二光源射出的光束辐射功率。
此外,光路改变单元包括带第一图案和第二图案的第一全息元件以及安装在第一全息元件之上带第三图案和第四图案的第二全息元件,第一全息元件分别衍射和透射来自第一光源和第二光源和入射光束,第二全息元件衍射和透射从物镜到所述光电检测器的入射光束。
附图说明
通过详细地描述一个优选实施例并结合参照附图,本发明的上述目的和优点会更加显而易见,其中:
图1是普通光学拾取设备的光路布置示意图;以及
图2是按照本发明一个实施例的光学拾取设备光路布置示意图。
具体实施方式
参照图2,按照本发明一个实施例的光学拾取设备包括:光学模块器件20,它发射光束并接收从记录介质1反射的光束;光折变晶体器件37,用于耦合两支入射光束的功率;和放置在光折变晶体器件37与记录介质1之间光路上的物镜39,用于把入射光束会聚到记录介质1。
光学模块器件20包括衬底22和衬底22上表面之上的外壳23。支架31固定在外壳23内衬底22上,第一光源41和第二光源51安装在支架31的相对两侧,用于检测来自记录介质1反射光束的光电检测器33安装在支架31的上表面。
在这个实施例中,第一光源41和第二光源51是边缘射出光的激光器。从两个光源41和51射出的两支光束被引向记录介质1,放在衬底22上的第一监视光电检测器43和第二监视光电检测器53分别接收相应两支的光束,这两个监视光电检测器分别控制光源41和51的辐射功率。
从第一光源41和从第二光源51射出的光束辐射功率是各不相同的。例如,第一光源41可以设计成光束的辐射功率为10mW或20mW,最好是,可选择地射出两个功率值中任一值的光束。例如,第二光源51可以设计成光束的辐射功率为5mW,这一功率远小于第一光源41的辐射功率。
嵌入到外壳23上部开孔中的光路改变单元30衍射和透射来自第一光源41和第二光源51的入射光束,且改变从记录介质1反射并指向光电检测器33的入射光束光路。
光路改变单元30包括第一全息元件45和55,以及分别与第一全息元件45和55耦合的第二全息元件47和57。第一全息元件45和55上分别有第一图案45a和第二图案55a,这两个全息元件衍射和透射第一光源41和第二光源51射出并指向物镜39的光束,第二全息元件47和57上分别有第三图案47a和第四图案57a,全息元件衍射和透射从记录介质1反射并指向光电检测器33的光束。
光折变晶体器件37是一个非线性器件,它耦合从第一光源41和第二光源51射出的光束功率,并把这两支光束引向物镜39。光折变晶体器件37是由以下材料制成,诸如BaTiO3,Bi12SiO20,LiNbO3,KNbO3,GaAs和SBN等。
最好是,本发明还包括放在光路改变单元与光折变晶体器件37之间的会聚透镜35,使入射光束会聚。按照本发明的光学拾取设备利用有两个光源的光学模块和光折变晶体器件,这两个光源射出功率不同的光束,得到了分别用于记录和再现所需合适功率的光束,因此可以省去调节电路,使光学拾取设备的结构简化。

Claims (4)

1.一种光学拾取设备,它包括:两个发射不同功率光束的第一光源和第二光源;放在第一和第二光源与记录介质之间光路上的光折变晶体器件,用于耦合从第一光源和第二光源射出的光束功率;以及放在光折变晶体器件与记录介质之间光路上的物镜,用于把从第一和第二光源射出的光束聚焦到所述记录介质上,该光学拾取设备的特征是,
所述第一和第二光源包含在光学模块器件内,该光学模块器件包括:
衬底;
固定在所述衬底上的支架;
安装在所述支架相对两侧的,所述第一光源和第二光源,每一个光源发射预定功率的光束;
安装在所述支架上的光电检测器,用于接收从记录介质反射的光束;
带开孔的外壳,开孔在外壳的上部;以及
安装在所述外壳开孔处的光路改变单元,用于改变入射光束的路程。
2.按照权利要求1的光学拾取设备,其中所述光学模块器件还包括第一和第二光电检测器,这两个光电检测器安装在所述衬底的上表面,它们分别检测从第一光源和第二光源射出的光束辐射功率。
3.按照权利要求1的光学拾取设备,其中所述光路改变单元包括:
带第一图案和第二图案的第一全息元件,第一全息元件分别衍射和透射来自第一光源和第二光源的入射光束;以及
安装在所述第一全息元件之上的第二全息元件,第二全息元件带有第三图案和第四图案,它们衍射和透射从所述物镜到所述光电检测器的入射光束。
4.按照权利要求1的光学拾取设备,还包括放在光路改变单元与光折变晶体器件之间的会聚透镜,使入射光束会聚。
CN97125349A 1996-12-06 1997-12-04 光学拾取设备 Expired - Fee Related CN1108608C (zh)

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KR62476/1996 1996-12-06
KR62476/96 1996-12-06
KR1019960062476A KR100230264B1 (ko) 1996-12-06 1996-12-06 광픽업장치

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CN1108608C true CN1108608C (zh) 2003-05-14

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EP1047051A3 (en) * 1999-04-19 2001-01-24 Samsung Electronics Co., Ltd. Light emitting module and compatible optical pickup device adopting the same
KR100627073B1 (ko) * 1999-06-15 2006-09-22 삼성테크윈 주식회사 칩 마운트용 결상광학계
US7079472B2 (en) * 1999-06-23 2006-07-18 Dphi Acquisitions, Inc. Beamshaper for optical head
DE60140028D1 (de) 2000-07-22 2009-11-12 Samsung Electronics Co Ltd Kompatibles optisches Abtastgerät
JP3979562B2 (ja) 2000-09-22 2007-09-19 パイオニア株式会社 光ピックアップ装置
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EP1389812A1 (en) * 2002-08-13 2004-02-18 Agilent Technologies Inc A mounting arrangement for high frequency electro-optical components
KR100529313B1 (ko) 2003-04-30 2005-11-17 삼성전자주식회사 광모듈 및 이를 채용한 광픽업
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JPH08297851A (ja) * 1995-04-26 1996-11-12 Toshiba Corp 光ヘッド装置の開口制限可変機構

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USRE38886E1 (en) 2005-11-22
KR100230264B1 (ko) 1999-11-15
US5995476A (en) 1999-11-30
JPH10172168A (ja) 1998-06-26
CN1184309A (zh) 1998-06-10
KR19980044383A (ko) 1998-09-05
JP2868498B2 (ja) 1999-03-10

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