CN1237759A - 光学头装置 - Google Patents

光学头装置 Download PDF

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CN1237759A
CN1237759A CN99105175A CN99105175A CN1237759A CN 1237759 A CN1237759 A CN 1237759A CN 99105175 A CN99105175 A CN 99105175A CN 99105175 A CN99105175 A CN 99105175A CN 1237759 A CN1237759 A CN 1237759A
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recording medium
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CN1131515C (zh
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赵虔皓
刘长勋
李庸勋
李哲雨
郑锺三
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Samsung Electronics Co Ltd
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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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
    • 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
    • G11B7/122—Flying-type heads, e.g. analogous to Winchester type in magnetic recording
    • 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
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • 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
    • G11B7/1384—Fibre optics
    • 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
    • G11B7/1387—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector using the near-field effect

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

Abstract

一种光学头装置，包括发光并接收从记录介质反射回的光的光组和位于光组和记录介质间光路上、聚焦入射光并在记录介质的记录面上形成光斑的固体浸没透镜(SIL)元件。其中，SIL元件有一面对记录介质的平面，并在入射有从光组出射的光的入射表面上形成有多个对称于中心轴线、曲率半径不同的椭圆曲面。

Description

光学头装置
本发明涉及一种光学头装置，尤其是涉及一种采用固体浸没透镜(SIL)以高密度记录再现信息的光学头装置。
图1所示的是以高密度记录/再现信息的传统光学头装置。从光组1出射的光由反射元件5射在SIL10上，然后由SIL10聚焦，在盘19的记录面上形成光斑。
光组1包括光源、转换入射光传播路径的器件和接收从盘19的记录面反射的光的光探测器。
反射元件5对入射光的入射角进行细微的改变，因而，可通过一步步移动盘19上形成的光斑而完成精细循轨。
SIL10支承于滑块15上，当盘19旋转时由于气体支承效应而从盘19浮起数十个纳米。SIL10的入射表面10a是曲面，能聚焦入射光；而其面对盘19的表面10b是平面。
在盘19上形成的光斑的尺寸大致可表示成： λ 2 NA - - - ( 1 ) 其中，λ是从光源射出的光的波长，NA是聚光器件的数值孔径。于是，为减小光斑尺寸以高密度记录/再现，必须减小波长或增大数值孔径。然而，从理论上讲，在空气中所能达到的最大数值孔径大约为1。
由于SIL10的表面10b离盘19非常近，因此，如果SIL10的折射率为nSIL，那么SIL10与盘19中光的波长等于λ/nSIL，与方程(1)相近，这样，SIL10的数值孔径相对于从光源出射的光的波长λ来说，大于或等于1，从而减小了光斑尺寸。这里，SIL10的折射率基本上等于保护盘19记录面的保护膜的折射率。
如上所述，使用SIL10时，因为SIL10和盘19间的距离由于盘19转动时的气体支承效应而保持在数十个纳米范围内，所以，光斑不会暴露于空气中，于是，数值孔径能大于或等于1，从而减小了光斑尺寸。
然而，如上所述，SIL10具有一个曲面，因此不能同时消除球差和慧差。换言之，如图所示，如果SIL10的入射表面10a盘成椭圆形，则可以消除球差。但是，消除球差的椭圆曲面不满足Abbe正弦条件，因而，对入射光的偏斜非常敏感。如图2和3所示，结果是偏斜入射并由SIL10聚焦的光S1产生了慧差。如果SIL10的入射面10a弯成半球形，则可消除慧差，但散焦和球差仍存在。
如上所述，因为采用SIL10的光学记录/再现设备对倾斜非常敏感而产生慧差，所以制造起来非常困难。
如图4所示，现有技术已提出了一种光学头装置，其聚焦物镜7单独地装在光组1和SIL10之间，这时，球差和慧差被物镜7消除，SIL10用于增大数值孔径。不过，由于具有上述结构的光学头装置采用了两个透镜，即物镜7和SIL10，所以，该系统复杂且笨重。
为解决上述问题，本发明的目的是提供一种光学头装置，其对入射光的偏斜不敏感，并且具有高的数值孔径以高密度地记录/再现信息，同时，通过使用单个透镜而使结构简单、紧凑。
相应地，为实现上述目的，提供了一种光学头装置，包括：光组，发射光并接收从记录介质反射回来的光；固体浸没透镜(SIL)元件，设在光组和记录介质之间的光路上，聚焦入射光并在记录介质的记录面上形成光斑，该光学头装置的特征在于，SIL元件具有一面对记录介质的平面，并且在入射有光组射出的光的入射表面上形成有多个相对于中心轴线对称的、具有不同曲率半径的椭圆曲面。
离中心轴线较远的椭圆曲率半径大于离中心轴线较近的椭圆曲率半径。
通过参照附图详细描述本发明的优选实施例，会更清楚本发明的上述目的和优点。图中，
图1是能高密度地进行记录/再现的传统光学头装置的示意图；
图2是图1所示光学头装置中所使用的固体浸没透镜(SIL)的示意图；
图3是由图1所示光学头装置中SIL聚焦成的光斑示意图；
图4是能高密度地进行记录/再现的另一传统实例的示意图；
图5是根据本发明能高密度地进行记录/再现的实施例的示意图；
图6是图5所示光学头装置中所使用的固体浸没透镜(SIL)的示意图；
图7是由图5所示光学头装置中SIL聚焦成的光斑的示意图；及
图8是根据本发明能高密度地进行记录/再现的另一实施例的示意图。
参见图5，本发明实施例的光学头装置包括发光并能接收从记录介质19反射回来的光的光组21，和位于光组21和记录介质19之间光路上的固体浸没透镜元件30。
光组21可以采用传统技术中的光组，包括光源(未示出)、转换入射光传播路径的器件(未示出)和接收从记录介质19反射的并已经过光路转换器件的光的光探测器。光路转换器件可以使用分束器或全息装置。
SIL元件30聚焦入射光，并在记录介质19的记录面上形成光斑，SIL元件30的入射表面33制成曲面，把从光组21发出的光聚焦在记录介质19的记录面上。另外，面对记录介质19的另一表面31制成平面。
在该实施例中，如图6所示，入射表面33具有多个对称于中心轴线(C)并且曲率半径不同的椭圆曲面33a,33b。优选地，椭圆曲面33a,33b的曲率半径随着远离中心轴线(C)而变大。
具有上述的椭圆曲面的SIL元件30几乎不产生球差，而且能补偿由于入射光偏斜而产生的慧差。因此，如图6所示，相对于SIL元件30偏斜入射的光聚焦成图7所示的光斑S2。
如图5所示，SIL元件30由滑块35支承，当盘形记录介质19旋转时，由于气体支承效应，SIL元件30和滑块35从记录介质19上略微抬起。SIL元件30的折射率大致等于保护记录介质19的记录面保护膜的折射率。使用SIL元件30能增加数值孔径的原理已经参照图在上面进行了说明，下面略去对其解释。
优选地，还在光组21和SIL元件30间的光路上设置有调整入射光倾角的反射元件25。通过转动反射元件25，能细微地改变入射到SIL元件30上的入射光的入射角，于是，通过一点点地改变记录介质19上形成的光斑的位置，能实现精细循轨。
根据本发明，通过采用具有多个椭圆曲面的SIL元件30，慧差的发生情况与采用传统光学头装置(图1标号10所指)相比减少了约1/3。
参见图8，根据本发明另一实施例的光学头装置还包括设在光组19和SIL元件30间的光路上的光纤40，用来传输光。光纤40有一用来把光从光组21传向SIL元件30、并能把光从SIL元件30传向光组21的通道。光纤40的设置便于光学记录/再现设备的制造，并且增宽了精细循轨区。
由于本发明的光学头装置采用了具有多个椭圆曲面的单个SIL元件，整个装置简单而紧凑。另外，光学头装置受慧差的影响显著减小，因此对入射光的偏斜不敏感。再者，因为数值孔径大于或等于1，减小了光斑的尺寸，从而能高密度地记录/再现信息信号。

Claims (4)

1．一种光学头装置，包括：光组，用于发出光并接收从记录介质反射回的光；固体浸没透镜元件，位于光组和记录介质间的光路上，用于聚焦入射光并在记录介质的记录面上形成光斑，该光学头装置的特征在于，固体浸没透镜元件有一面对记录介质的平面，并在入射有从光组出射的光的入射表面上对称于中心轴线形成有多个不同曲率半径的椭圆曲面。
2．如权利要求1的光学头装置，其特征在于，离中心轴线较远的椭圆曲率半径大于离中心轴线较近的椭圆曲率半径。
3．如权利要求1的光学头装置，还包括装在光组和SIL元件间的光路上的用于调整入射光倾角的反射元件。
4．如权利要求1的光学头装置，还包括装在光组和SIL元件间光路上的用于在其间传输光的光纤。
CN99105175A 1998-04-27 1999-04-26 光学头装置 Expired - Fee Related CN1131515C (zh)

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KR1019980014990A KR100297764B1 (ko) 1998-04-27 1998-04-27 고밀도 기록/재생 가능한 광픽업장치
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EP (1) EP0953975B1 (zh)
JP (1) JP3209980B2 (zh)
KR (1) KR100297764B1 (zh)
CN (1) CN1131515C (zh)
BR (1) BR9901405A (zh)
DE (1) DE69930584T2 (zh)
ID (1) ID22507A (zh)
MY (1) MY123261A (zh)
RU (1) RU2179750C2 (zh)
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CN100410718C (zh) * 2003-10-31 2008-08-13 浜松光子学株式会社 试样观察方法
CN100585467C (zh) * 2006-08-09 2010-01-27 索尼株式会社 背光器件、光源器件、透镜、电子设备和光导板
CN101147596B (zh) * 2007-11-05 2010-12-08 南京雨润食品有限公司 一种保油剂
CN107567584A (zh) * 2015-05-04 2018-01-09 Asml荷兰有限公司 用于检查及量测的方法和设备
CN107567584B (zh) * 2015-05-04 2020-07-17 Asml荷兰有限公司 用于检查及量测的方法和设备
CN108333704A (zh) * 2017-09-29 2018-07-27 北京万维智能技术有限公司 定焦镜头装置

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EP0953975A2 (en) 1999-11-03
JPH11339310A (ja) 1999-12-10
JP3209980B2 (ja) 2001-09-17
CN1131515C (zh) 2003-12-17
KR100297764B1 (ko) 2001-08-07
KR19990081193A (ko) 1999-11-15
BR9901405A (pt) 2000-02-01
US6114689A (en) 2000-09-05
ID22507A (id) 1999-10-28
SG87028A1 (en) 2002-03-19
DE69930584T2 (de) 2006-12-28
RU2179750C2 (ru) 2002-02-20
EP0953975B1 (en) 2006-03-29
EP0953975A3 (en) 1999-11-17
DE69930584D1 (de) 2006-05-18
TW424224B (en) 2001-03-01
MY123261A (en) 2006-05-31

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