GB1351812A - Information storage devices - Google Patents

Information storage devices

Info

Publication number
GB1351812A
GB1351812A GB1351812DA GB1351812A GB 1351812 A GB1351812 A GB 1351812A GB 1351812D A GB1351812D A GB 1351812DA GB 1351812 A GB1351812 A GB 1351812A
Authority
GB
United Kingdom
Prior art keywords
centres
electric field
band light
information
band
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of GB1351812A publication Critical patent/GB1351812A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/041—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using photochromic storage elements

Landscapes

  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

1351812 Data storage devices DEFENCE SECRETARY OF STATE FOR 3 May 1972 [10 May 1971] 13989/71 Heading G4C Information is stored in the form of colour centres in which single or double electrons are trapped (F or F<SP>1</SP> centres), the concentration of the F or F<SP>1</SP> centres is changed by irradiation with F or F<SP>1</SP> band light while an electric field is applied to the storage material, and the information stored is read out by detecting the amount of F-band light absorbed by the storage material. The presence of the electric field enhances the F to F<SP>1</SP> photochemical conversion process at low temperatures, e.g. 77‹ K. In one embodiment the storage material is a KCl crystal which has been heat treated with potassium vapour to form F centres. An F-band argon laser beam is deflected on to a desired part of the crystal while an electric field is applied to cause conversion of F centres to F<SP>1</SP> centres. Read-out is performed with the same laser beam but without the electric field so that low absorption of F-band light is detected at areas containing a high concentration of F<SP>1</SP> centres. Information is erased by an F<SP>1</SP>-band He/Ne laser beam which causes the conversion of F<SP>1</SP> centres to F centres. Alternatively, the F<SP>1</SP>-band light may be used to write information while the F- band light, in conjunction with the electric field is used to erase information.
GB1351812D 1971-05-10 1971-05-10 Information storage devices Expired GB1351812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1398971 1971-05-10

Publications (1)

Publication Number Publication Date
GB1351812A true GB1351812A (en) 1974-05-01

Family

ID=10033004

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1351812D Expired GB1351812A (en) 1971-05-10 1971-05-10 Information storage devices

Country Status (2)

Country Link
DE (1) DE2222920A1 (en)
GB (1) GB1351812A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733369A (en) * 1981-09-09 1988-03-22 Udo Bogner Method for providing separately adjustable voltage dependent optical properties
GB2198546A (en) * 1986-11-24 1988-06-15 Ciba Geigy Ag Method of optically recording and reading information

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010421A (en) * 1983-06-27 1985-01-19 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Recording of data

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733369A (en) * 1981-09-09 1988-03-22 Udo Bogner Method for providing separately adjustable voltage dependent optical properties
GB2198546A (en) * 1986-11-24 1988-06-15 Ciba Geigy Ag Method of optically recording and reading information
GB2198546B (en) * 1986-11-24 1990-11-14 Ciba Geigy Ag Method of optically recording and reading information

Also Published As

Publication number Publication date
DE2222920A1 (en) 1972-11-23

Similar Documents

Publication Publication Date Title
KR880005185A (en) How to record optical information
GB1309103A (en) High density permanent data storage and retrieval system
GB1351812A (en) Information storage devices
JPS5258940A (en) Laser recording method and device
US3654626A (en) Three-dimensional storage system using f-centers
EP0396943A3 (en) Optical storage medium and storage process
JPS5250702A (en) Optical information recording and reproduction apparatus
JPS52138145A (en) Optical recording device
SU1010657A1 (en) Rag&#39;s method of writing and reading optical data in alkali-halide crystal activated by mercury-like ions
JPS536516A (en) Optical recording and reproducing unit
JPS54834A (en) Optical information processing system
US3727194A (en) Non-destructive readout of a color center memory by using infrared illumination
JPS5342702A (en) Write-in, erase, read-out method for optical information
JPS634166B2 (en)
SU596079A1 (en) Active medium material for recording and storing information
JPS5370637A (en) Addressable memory for electron ray beam
JPS56148740A (en) Method for recording and erasing of optical information
JPS5250649A (en) Optical information record reproduction device
JPS57138066A (en) Information recorder
SU1084892A1 (en) Method of regat recording of optical information in activator-doped alkaline halogen crystal
SU670969A1 (en) Record carrier
GB1093436A (en) Improvements in or relating to processes for recording and reproducing data on recording carriers
SU1094059A1 (en) Photochrome layer for optical record medium
FR2138600A1 (en) Reversible optical information carrier medium - of scandium -doped (in) organic (micro)crystals, for long-term stability
SU1076949A1 (en) Medium for recording optical information

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee