KR930014362A - Reversible Optical Information Storage Method Using Liquid Crystal Polymer as Information Recording Medium - Google Patents

Reversible Optical Information Storage Method Using Liquid Crystal Polymer as Information Recording Medium Download PDF

Info

Publication number
KR930014362A
KR930014362A KR1019910024720A KR910024720A KR930014362A KR 930014362 A KR930014362 A KR 930014362A KR 1019910024720 A KR1019910024720 A KR 1019910024720A KR 910024720 A KR910024720 A KR 910024720A KR 930014362 A KR930014362 A KR 930014362A
Authority
KR
South Korea
Prior art keywords
liquid crystal
crystal polymer
polarization
information
thermotropic liquid
Prior art date
Application number
KR1019910024720A
Other languages
Korean (ko)
Other versions
KR940006131B1 (en
Inventor
김영하
한양규
김동유
Original Assignee
박원희
한국과학기술연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 박원희, 한국과학기술연구원 filed Critical 박원희
Priority to KR1019910024720A priority Critical patent/KR940006131B1/en
Publication of KR930014362A publication Critical patent/KR930014362A/en
Application granted granted Critical
Publication of KR940006131B1 publication Critical patent/KR940006131B1/en

Links

Classifications

    • 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
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Liquid Crystal (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

내용 없음No content

Description

정보 기록 매체로서 액정 고분자를 이용한 가역적 광학적 정보 저장 방법Reversible Optical Information Storage Method Using Liquid Crystal Polymer as Information Recording Medium

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제 1 도는 본 발명의 방법에 따라 폴리(말론산에스테르)의 정보 기록층에 4mW/㎠의 세기를 갖는 자외선 편광을 2분간 조사하여 기록한 정보를 광학 평광 현미경에 의해 얻은 화상(배율 25배).1 is an image obtained by irradiating an ultraviolet polarized light having an intensity of 4 mW / cm 2 to an information recording layer of poly (malonic acid ester) for 2 minutes in accordance with the method of the present invention (25 times magnification).

제 2 도는 제 1 도의 화상을 4배 확대한 화상의 부분도.2 is a partial view of an image in which the image of FIG. 1 is enlarged 4 times.

Claims (16)

아조벤젠 그룹을 포함하고 있는 열방성 액정 고분자가 등방상 상태로 되어 있는 박막의 기록층에 상온에서 포토마스크를 통하여 자외선 편광을 조사함으로써 액정 고분자를 아조벤젠 그룹의 광이성화 반응에 의해 액정상으로 상전이시킨 다음, 이를 유리 전이 온도(Tg) 이하로 냉각시켜 고밀도의 정보를 가역적으로 상온에서 안정하게 저장하는 것을 특징으로 하는 새로운 가역적 광학적 정보 저장 방법.The liquid crystal polymer is phase-transformed into a liquid crystal phase by photoisomerization of an azobenzene group by irradiating ultraviolet polarized light through a photomask to a recording layer of a thin film in which an isotropic liquid crystal polymer containing azobenzene group is in an isotropic state. The new reversible optical information storage method, characterized in that the cooling to below the glass transition temperature (Tg) to store a high density of information reversibly stable at room temperature. 제 1 항에 있어서, 정보 기록 매체가 아래 구조식( I )의 반복 구조로 구성된 열방성 액정 고분자인 방법.The method according to claim 1, wherein the information recording medium is a thermotropic liquid crystal polymer composed of a repeating structure represented by the following structural formula (I). 위 식에서, m은 4 내지 12이고, n은 1 내지 3이다.Wherein m is 4 to 12 and n is 1 to 3. 제 2 항에 있어서, 열방성 액정 고분자가 네마틱 액정상의 구조를 갖는 방법.The method according to claim 2, wherein the thermotropic liquid crystal polymer has a structure of a nematic liquid crystal phase. 제 2 항에 있어서, 열방성 액정 고분자의 고유 점도가 0.05-1.0인 방법.The method according to claim 2, wherein the intrinsic viscosity of the thermotropic liquid crystal polymer is 0.05-1.0. 제 2 항 또는 4항에 있어서, 열방성 액정 고분자의 주쇄의 메틸렌기의 수가 m=6이고, 그 고유 점도가 0.05-0.4인 방법.The method according to claim 2 or 4, wherein the number of methylene groups in the main chain of the thermotropic liquid crystal polymer is m = 6, and its intrinsic viscosity is 0.05-0.4. 제 1 항에 있어서, 열방성 액정 고분자의 유리 전이 온도(Tg)가 0 내지 70℃인 방법.The method according to claim 1, wherein the glass transition temperature (Tg) of the thermotropic liquid crystal polymer is 0 to 70 ° C. 제 1 항에 있어서, 열방성 액정 고분자를 유기 용매에 녹여 박막을 제조한 다음 액정 고분자의 용융 온도로 가열하고 나서 유리 전이 온도(Tg) 이하로 냉각시켜 등방상 상태가 고정된 박막을 정보 기록층으로 사용하는 방법.The information recording layer according to claim 1, wherein the thermotropic liquid crystal polymer is dissolved in an organic solvent to prepare a thin film, and then heated to the melting temperature of the liquid crystal polymer, and then cooled to a glass transition temperature (Tg) or less to fix the thin film having an isotropic state fixed therein. How to use 제 1 항 또는 7항에 있어서, 등방성 상태로 고정되어 있는 액정 고분자의 박막을 아조벤젠의 광이성화 반응에 의해 액정상으로 상전이시키는 광원으로서 광학 필터의 편광판을 통하여 얻은 최대 흡수 파장이 365nm인 자외선 편광을 사용하는 방법.The ultraviolet light polarization according to claim 1 or 7, wherein a maximum absorption wavelength obtained through a polarizing plate of an optical filter is 365 nm as a light source for phase-transferring a thin film of a liquid crystal polymer fixed in an isotropic state to a liquid crystal phase by photoisomerization reaction of azobenzene. How to use. 제 1 항에 있어서, 조사된 자외선 편광의 세기가 20-1mW/㎠인 방법.The method of claim 1, wherein the intensity of irradiated ultraviolet polarization is 20-1 mW / cm 2. 제 1 항에 있어서, 자외선 편광의 조사 시간이 10초-10분인 방법.The method according to claim 1, wherein the irradiation time of ultraviolet polarization is 10 seconds-10 minutes. 제 1 항 또는 2항에 있어서, 기록 매체로서 주쇄의 메틸렌기의 수가 m=6이고 에틸렌옥시 스페이서(spacer)의 수가 m=2인 열방성 액정 고분자를 사용하여 상온에서 약 6개월 동안 안정하게 정보를 저장하는 방법.The thermotropic liquid crystal polymer according to claim 1 or 2, wherein the number of methylene groups in the main chain as the recording medium is m = 6 and the number of ethyleneoxy spacers is m = 2. How to save it. 제 1 항에 있어서, 기록된 정보를 저출력의 광학 편광 현미경 또는 633nm의 레이저 편광에 의해 판독되는 방법.The method of claim 1, wherein the recorded information is read by a low power optical polarization microscope or laser polarization at 633 nm. 제12항에 있어서, 정보 기록시 입사된 자외선 편광의 축에 대하여 광학 편광 현미경의 교차된 편광 방향이 서로 45°인 각도에서 기록된 정보를 판독하는 방법.13. The method of claim 12, wherein the recorded information is read at an angle at which the directions of the crossed polarizations of the optical polarization microscopes with respect to the axis of the incident ultraviolet polarization at the time of information recording are 45 degrees to each other. 제 1 항에 있어서, 기록된 정보를 사용된 열방성 액정 고분자의 용융 온도로 가열한 후 상온으로 냉각시켜 소거하는 방법.The method according to claim 1, wherein the recorded information is heated to the melting temperature of the used thermotropic liquid crystal polymer and then cooled to room temperature to be erased. 제 1 항 또는 14항에 있어서, 소거된 정보를 제 1 항의 방법을 반복하여 가역적으로 정보를 재기록할 수 있는 방법.The method according to claim 1 or 14, wherein the erased information can be reversibly rewritten by repeating the method of claim 1. 제 1 항에 있어서, 정보 기록층에 입사되는 자외선 편광의 각도를 변화시킴으로써 동일한 기록층에 서로 다른 정보를 중첩하여 저장할 수 있는 방법.A method according to claim 1, wherein different information can be superimposed and stored in the same recording layer by changing the angle of ultraviolet polarization incident on the information recording layer. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910024720A 1991-12-27 1991-12-27 Information saving method using liquid crystalline polymer KR940006131B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910024720A KR940006131B1 (en) 1991-12-27 1991-12-27 Information saving method using liquid crystalline polymer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019910024720A KR940006131B1 (en) 1991-12-27 1991-12-27 Information saving method using liquid crystalline polymer

Publications (2)

Publication Number Publication Date
KR930014362A true KR930014362A (en) 1993-07-23
KR940006131B1 KR940006131B1 (en) 1994-07-06

Family

ID=19326311

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019910024720A KR940006131B1 (en) 1991-12-27 1991-12-27 Information saving method using liquid crystalline polymer

Country Status (1)

Country Link
KR (1) KR940006131B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100565568B1 (en) * 1999-05-10 2006-03-30 엘지전자 주식회사 optical recording medium
KR20200077661A (en) * 2018-12-20 2020-07-01 경북대학교 산학협력단 Holographic writing method and holographic writing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100565568B1 (en) * 1999-05-10 2006-03-30 엘지전자 주식회사 optical recording medium
KR20200077661A (en) * 2018-12-20 2020-07-01 경북대학교 산학협력단 Holographic writing method and holographic writing apparatus

Also Published As

Publication number Publication date
KR940006131B1 (en) 1994-07-06

Similar Documents

Publication Publication Date Title
Shibaev Polymers as electrooptical and photooptical active media
Sung et al. Dynamics of photochemical phase transition of guest/host liquid crystals with an azobenzene derivative as a photoresponsive chromophore
Hrozhyk et al. Photoinduced isotropic state of cholesteric liquid crystals: novel dynamic photonic materials
Ramanujam et al. Novel biphotonic holographic storage in a side‐chain liquid crystalline polyester
Zebger et al. Photoorientation of a liquid-crystalline polyester with azobenzene side groups: effects of irradiation with linearly polarized red light after photochemical pretreatment
KR100774779B1 (en) Copolymers for optical data storage
Fuh et al. Direct optical switching of bistable cholesteric textures in chiral azobenzene-doped liquid crystals
US11581691B2 (en) All-optical, optically addressable liquid crystal-based light valve employing photoswitchable alignment layer for high-power and/or large aperture laser applications
JPH04228132A (en) Information storage medium and method for recording and holding using the medium
Natarajan et al. Liquid crystalline siloxanes containing spiropyran chromophores as reversible optical data storage materials
KR930014362A (en) Reversible Optical Information Storage Method Using Liquid Crystal Polymer as Information Recording Medium
Sasaki et al. Spontaneous polarization vector reorientation photorefractive effect in dye-doped ferroelectric liquid crystals
Kawatsuki et al. Thermally enhanced photoinduced molecular reorientation in a photo-crosslinkable polymer liquid crystal based on polarization triplet energy transfer
JP2001100171A (en) Liquid crystal, optical material for thermal writing using side-chain liquid crystal copolymer
JPS6351494A (en) Liquid crystal optical element
JP2001265199A (en) Hologram recording medium
Churikov et al. Optically induced anisotropy of third-order susceptibility in azo-dye polymers
Chen et al. Optically and thermally controllable light scattering based on dye-doped liquid crystals in poly (N-vinylcarbazole) films-coated liquid crystal cell
KR100252948B1 (en) Liquid crystal polymer for using as an information-stored material and method for producing a thin film using the same
JP2000328051A (en) Liquid crystal optical element and optical switching method
Li et al. Holographic data storage on azobenzene photopolymer film using nanosecond laser pulses
JP2001100189A (en) Thermal writing liquid crystal optical material utilizing polymer network
Eichler et al. New glassy liquid crystals for optical data-storage applications
JP3718234B2 (en) Composition containing chiral compound and nematic liquid crystal and device using the same
JP2810379B2 (en) Information recording medium

Legal Events

Date Code Title Description
A201 Request for examination
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 19970829

Year of fee payment: 6

LAPS Lapse due to unpaid annual fee