GB1351812A - Information storage devices - Google Patents
Information storage devicesInfo
- 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
Links
- 230000005684 electric field Effects 0.000 abstract 5
- 238000006243 chemical reaction Methods 0.000 abstract 3
- 239000011232 storage material Substances 0.000 abstract 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract 2
- 239000013078 crystal Substances 0.000 abstract 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 229910052786 argon Inorganic materials 0.000 abstract 1
- 238000013500 data storage Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 229910052700 potassium Inorganic materials 0.000 abstract 1
- 239000011591 potassium Substances 0.000 abstract 1
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
- Thermal Transfer Or Thermal Recording In General (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (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.
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)
| 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)
| 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 |
-
1971
- 1971-05-10 GB GB1351812D patent/GB1351812A/en not_active Expired
-
1972
- 1972-05-10 DE DE19722222920 patent/DE2222920A1/en active Pending
Cited By (3)
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |