FR2231075A1 - Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentration - Google Patents
Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentrationInfo
- Publication number
- FR2231075A1 FR2231075A1 FR7417807A FR7417807A FR2231075A1 FR 2231075 A1 FR2231075 A1 FR 2231075A1 FR 7417807 A FR7417807 A FR 7417807A FR 7417807 A FR7417807 A FR 7417807A FR 2231075 A1 FR2231075 A1 FR 2231075A1
- Authority
- FR
- France
- Prior art keywords
- tape
- erasure
- data
- inscription
- magnetic tape
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/16—Layers for recording by changing the magnetic properties, e.g. for Curie-point-writing
-
- 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
- G11C13/06—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 magneto-optical elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The tape is coated with a magneto-optic layer of semiconducting magnetic material of formula CuCrSe3X where X is Cl, Br or I or a non-stoichiometric modification thereof. To write in the data the material is irradiated with laser light in local spots to produce a slight increase of local temp. which remains below the Curie point, while applying a magnetic field to the interior of the tape, which is below the coercive field of the non-illuminated part of the layer but above that of the illuminated part, the tape being thus magnetised and demagnetised locally. The materials used have high specific Faraday rotation (F) and low absorption (x) so that the ratio 2F/x is very high. Erasure is by heating and raising the inductive field simultaneously over the whole tape and subsequent cooling in a magnetic field.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2326315A DE2326315A1 (en) | 1973-05-23 | 1973-05-23 | METHOD FOR STORING MAGNETICALLY ENCODED DATA IN A MAGNETO-OPTIC SEMICONDUCTOR LAYER |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2231075A1 true FR2231075A1 (en) | 1974-12-20 |
FR2231075B3 FR2231075B3 (en) | 1977-03-18 |
Family
ID=5881923
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7417807A Granted FR2231075A1 (en) | 1973-05-23 | 1974-05-22 | Inscription and erasure of data on magnetic tape - using both magneto inductive and laser methods at reduced concentration |
Country Status (6)
Country | Link |
---|---|
US (1) | USB472276I5 (en) |
BE (1) | BE815433A (en) |
DE (1) | DE2326315A1 (en) |
FR (1) | FR2231075A1 (en) |
IT (1) | IT1012631B (en) |
NL (1) | NL7406588A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2572575B1 (en) * | 1984-10-30 | 1989-10-13 | Thomson Csf | INFORMATION TRANSCRIPTION METHOD AND SYSTEM IMPLEMENTING THIS METHOD |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3625583A (en) * | 1968-07-15 | 1971-12-07 | Ibm | Erasable hologram |
US3680065A (en) * | 1970-05-25 | 1972-07-25 | Ibm | Nonvolatile magneto-optical memory element and a method of writing thereon |
-
1973
- 1973-05-23 DE DE2326315A patent/DE2326315A1/en active Pending
-
1974
- 1974-05-16 NL NL7406588A patent/NL7406588A/xx unknown
- 1974-05-20 IT IT22938/74A patent/IT1012631B/en active
- 1974-05-22 FR FR7417807A patent/FR2231075A1/en active Granted
- 1974-05-22 BE BE144660A patent/BE815433A/en unknown
- 1974-05-22 US US47227674 patent/USB472276I5/en active Pending
Also Published As
Publication number | Publication date |
---|---|
NL7406588A (en) | 1974-11-26 |
FR2231075B3 (en) | 1977-03-18 |
USB472276I5 (en) | 1976-03-09 |
BE815433A (en) | 1974-09-16 |
IT1012631B (en) | 1977-03-10 |
DE2326315A1 (en) | 1974-12-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |