CN1782743A - 镜片 - Google Patents

镜片 Download PDF

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Publication number
CN1782743A
CN1782743A CNA200410077279XA CN200410077279A CN1782743A CN 1782743 A CN1782743 A CN 1782743A CN A200410077279X A CNA200410077279X A CN A200410077279XA CN 200410077279 A CN200410077279 A CN 200410077279A CN 1782743 A CN1782743 A CN 1782743A
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CN
China
Prior art keywords
eyeglass
sub
grating
wavelength
wavelength grating
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Pending
Application number
CNA200410077279XA
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English (en)
Inventor
余泰成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
Original Assignee
Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Publication date
Application filed by Hongfujin Precision Industry Shenzhen Co Ltd, Hon Hai Precision Industry Co Ltd filed Critical Hongfujin Precision Industry Shenzhen Co Ltd
Priority to CNA200410077279XA priority Critical patent/CN1782743A/zh
Priority to US11/261,117 priority patent/US20060119944A1/en
Publication of CN1782743A publication Critical patent/CN1782743A/zh
Pending legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/18Diffraction gratings
    • G02B5/1809Diffraction gratings with pitch less than or comparable to the wavelength
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G02B27/0037Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration with diffracting elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/4205Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/4272Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having plural diffractive elements positioned sequentially along the optical path
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/18Diffraction gratings
    • G02B5/1876Diffractive Fresnel lenses; Zone plates; Kinoforms
    • G02B5/189Structurally combined with optical elements not having diffractive power
    • G02B5/1895Structurally combined with optical elements not having diffractive power such optical elements having dioptric power

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

本发明是关于一种镜片,该镜片包括第一表面和第二表面,其中至少第一表面或第二表面上设有次波长光栅,该次波长光栅的周期小于可见光的波长。该具次波长光栅的镜片,可有效降低入射光线通过镜片时的菲涅耳损失,同时有效降低横轴像差和纵轴像差。

Description

镜片
【技术领域】
本发明是关于一种镜片。
【背景技术】
传统镜片在光线穿过时,镜片光路图请参见图1,因空气与镜片折射率不同,因此当光线通过时会造成菲涅耳损失,使照度降低,从而降低了光学分辨率,此外,可见光中有多种波长的光线,所以当可见光通过镜片时,不同波长的光线不能聚焦为一点,而造成横轴像差和纵轴像差。
为改进镜片性能,现有的方式采用镜片表面镀覆一层抗反射膜(Anti-reflection coating),来提升照度,以降低菲涅耳损失,但是该种镀覆抗反射膜的方式不能有效消除横轴像差和纵轴像差,不能满足更高性能的镜片要求。
为改善镜片性能,有必要提供一种能提升照度及减小像差的镜片。
【发明内容】
本发明的目的在于提供一种能提升照度及减小像差的镜片。
本发明公开一种镜片,该镜片包括第一表面和第二表面,其中至少第一表面或第二表面设有次波长光栅,该次波长光栅的周期小于可见光的波长。
相较现有技术,本发明镜片,通过在镜片表面设有次波长光栅,可减少菲涅耳损失,提高并可减小镜片的横轴像差和纵轴像差,有效提高了镜片成像性能。
【附图说明】
图1是现有镜片光路图;
图2是本发明镜片表面的次波长光栅示意图;
图3是本发明镜片光路图。
【具体实施方式】
本发明公开一种镜片,该镜片表面设有次波长光栅。
光栅是传统光学中的基本组件。当光栅对于不同的入射光波长,其表现方式可分为三种,一种为光栅的周期远大于入射光波长,另一种为光栅周期远小于入射光波长,再一种为光栅周期近似于入射光波长。当光栅的周期小于入射光的波长时,此光栅称为次波长光栅。当可见光经次波长光栅时,可发生衍射,进而影响光的传播性能。本发明即利用次波长光栅减小镜片表面的横轴像差和纵轴像差。
次波长光栅的形状通常呈周期性排列,每一周期的横截面即可为矩形,也可为锯齿形或正弦形,具体形状要依据设计要求来决定。呈矩形排列的次波长光栅通常形状由长l、宽w、周期p来描述。
本实施例的光栅形状请参见图2形式,该光栅的宽w及周期p不变,而长l依次递增,且长、宽小于可见光波长,最好小于1微米。
请参见图3,该镜片包括第一表面1和第二表面2,第一表面1和第二表面2两边缘对称设有次波长光栅3。因边缘部分对可见光的横轴像差和纵轴像差影响较大,故次波长光栅3设于镜片两表面边缘,且可减少加工面,而中间部分用抗反射膜来取代,从而使镜片有较好的综合性能。
该次波长光栅3折射率等效于neff,周期小于可见光波长,通常小于1微米,其次波长光栅的折射率neff大于可见光于空气中的折射率n0,同时小于可见光于塑胶镜片中的折射率n2,因此当可见光经过镜片时,其从空气中,先经次波长光栅折射率neff,再经折射率n2,因此避免使可见光折射率直接从n0变为n2,减少了菲涅耳损失。
该次波长光栅3用在镜片表面上,高低不同,从而于可见光通过时,产生衍射效应。衍射的光线可产生聚集效应,以减少横轴像差和纵轴像差。
在镜片表面加工次波长光栅制造方法可采用较多种方式,通常先加工出具次波长光栅的模仁,再采用模压成形法来制作次波长光栅。
制造次波长光栅的模仁方法可采用刻蚀加工法、薄膜沉积法、电子光束显影法等。电子光束显影法在镜片表面制作次波长光栅,其采用具有短波特性的高能电子作为曝光光源。其基本原理是在合适的模仁表面镀覆镍,再在镍层表面上镀覆一层抗蚀剂薄膜,形成一层显影层,然后将用电子光束照射其显影层,藉由电子对特殊的阻剂(resist)进行直写,且藉由电磁线圈来控制电子行进路线,来在上下模仁上制作出各种包含周期性及非周期性等图案。目前电子光束可做到最小线宽达0.5微米。
将玻璃模胚置于刻有次波长光栅的上下模仁,通过加温加压来制作,以便于镜片大批量生产。
可以理解,该次波长光栅可直接刻于镜片表面,也可仅在该镜片一表面上镀覆次波长光栅。该次波长光栅的周期、长、宽均可以调整,以较好的满足镜片成像性能。

Claims (7)

1.一种镜片,该镜片包括第一表面和第二表面,其特征在于:所述镜片的至少第一表面或第二表面上设有次波长光栅,该次波长光栅的周期小于可见光的波长。
2.如权利要求1所述的镜片,其特征在于:该次波长光栅的长宽小于可见光的波长。
3.如权利要求2所述的镜片,其特征在于:该光栅的长宽及其周期小于1微米。
4.如权利要求1所述的镜片,其特征在于:该光栅的横截面为矩形。
5.如权利要求1所述的镜片,其特征在于:该光栅设于第一表面与第二表面上且位于镜片两端。
6.如权利要求5所述的镜片,其特征在于:该抗反射膜位于镜片中部。
7.如权利要求6所述的镜片,其特征在于:该光栅的长度依次递增,宽和周期不发生变化。
CNA200410077279XA 2004-12-04 2004-12-04 镜片 Pending CN1782743A (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CNA200410077279XA CN1782743A (zh) 2004-12-04 2004-12-04 镜片
US11/261,117 US20060119944A1 (en) 2004-12-04 2005-10-28 Lens including a sub-wavelength grating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA200410077279XA CN1782743A (zh) 2004-12-04 2004-12-04 镜片

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CN1782743A true CN1782743A (zh) 2006-06-07

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CN (1) CN1782743A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107976798A (zh) * 2016-10-21 2018-05-01 占忠(天津)光电科技有限公司 可降低像差的高清望远镜

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110085232A1 (en) * 2009-10-08 2011-04-14 The Penn State Research Foundation Multi-spectral filters, mirrors and anti-reflective coatings with subwavelength periodic features for optical devices
US9354363B2 (en) 2010-04-13 2016-05-31 Hewlett Packard Enterprise Development Lp Controlling phase response in a sub-wavelength grating lens

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561558A (en) * 1993-10-18 1996-10-01 Matsushita Electric Industrial Co., Ltd. Diffractive optical device
JPH11326617A (ja) * 1998-05-13 1999-11-26 Olympus Optical Co Ltd 回折光学素子を含む光学系及びその設計方法
EP1412782A4 (en) * 2000-11-03 2006-02-15 Mems Optical Inc ANTI-REFLECTIVE STRUCTURES
DE10123230A1 (de) * 2001-05-12 2002-11-28 Zeiss Carl Diffraktives optisches Element sowie optische Anordnung mit einem diffraktiven optischen Element
JP2005062525A (ja) * 2003-08-13 2005-03-10 Canon Inc 光学素子および光学系

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107976798A (zh) * 2016-10-21 2018-05-01 占忠(天津)光电科技有限公司 可降低像差的高清望远镜

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