GB667011A - Improved method of and apparatus for erasing signals from magnetic sound record carriers - Google Patents
Improved method of and apparatus for erasing signals from magnetic sound record carriersInfo
- Publication number
- GB667011A GB667011A GB289350A GB289350A GB667011A GB 667011 A GB667011 A GB 667011A GB 289350 A GB289350 A GB 289350A GB 289350 A GB289350 A GB 289350A GB 667011 A GB667011 A GB 667011A
- Authority
- GB
- United Kingdom
- Prior art keywords
- turntable
- electromagnet
- improved method
- record carriers
- sound record
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/024—Erasing
- G11B5/0245—Bulk erasing
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
667,011. Demagnetizing apparatus. KOLB, O. K. Feb. 3, 1950, No. 2893/50. Class 35. In an apparatus for demagnetizing reels of magnetic recording tape without unwinding, the reel 3 is rotated on a turntable 2 whilst an A.C. excited electromagnet 4 is moved towards and away from the centre-line of the turntable. The turntable is geared to a manually rotatable screw 9 which imparts the linear motion to a wheeled carriage 7 carrying the electromagnet, the current being supplied by leads 21. It is stated that the electromagnet may traverse the reel from centre to edge or between opposite edges, and the turntable may have linear motion and the magnet may be rotatable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB289350A GB667011A (en) | 1950-02-03 | 1950-02-03 | Improved method of and apparatus for erasing signals from magnetic sound record carriers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB289350A GB667011A (en) | 1950-02-03 | 1950-02-03 | Improved method of and apparatus for erasing signals from magnetic sound record carriers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB667011A true GB667011A (en) | 1952-02-20 |
Family
ID=9747995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB289350A Expired GB667011A (en) | 1950-02-03 | 1950-02-03 | Improved method of and apparatus for erasing signals from magnetic sound record carriers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB667011A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2975239A (en) * | 1954-12-24 | 1961-03-14 | Ibm | Electromagnetic eraser |
US3023280A (en) * | 1958-07-30 | 1962-02-27 | Ampex | Degaussing apparatus |
US3143689A (en) * | 1960-08-15 | 1964-08-04 | John R Hall | Magnetic recording tape erasure apparatus |
FR2448354A1 (en) * | 1979-02-02 | 1980-09-05 | Beaulieu Antonio | Electromagnetic therapy for rheumatism and arthritis - uses AC magnetic sliding along track to give irradiation of varying strength according to position |
-
1950
- 1950-02-03 GB GB289350A patent/GB667011A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2975239A (en) * | 1954-12-24 | 1961-03-14 | Ibm | Electromagnetic eraser |
US3023280A (en) * | 1958-07-30 | 1962-02-27 | Ampex | Degaussing apparatus |
US3143689A (en) * | 1960-08-15 | 1964-08-04 | John R Hall | Magnetic recording tape erasure apparatus |
FR2448354A1 (en) * | 1979-02-02 | 1980-09-05 | Beaulieu Antonio | Electromagnetic therapy for rheumatism and arthritis - uses AC magnetic sliding along track to give irradiation of varying strength according to position |
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