GB512766A - Method and apparatus for recording and reproducing low frequency vibrations - Google Patents
Method and apparatus for recording and reproducing low frequency vibrationsInfo
- Publication number
- GB512766A GB512766A GB33081/37A GB3308137A GB512766A GB 512766 A GB512766 A GB 512766A GB 33081/37 A GB33081/37 A GB 33081/37A GB 3308137 A GB3308137 A GB 3308137A GB 512766 A GB512766 A GB 512766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- recording
- magnetic
- grooves
- nov
- winding
- 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
- G11B5/642—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent self supporting magnetic material, e.g. magnetisable wires
Landscapes
- Paints Or Removers (AREA)
Abstract
512,766. Recording and reproducing sound. BAERMANN, M., and DYNAMIT-AKT.-GES. VORM. A. NOBEL & CO. Nov. 30, 1937, No. 33081. Void. Convention date, Nov. 30, 1936. [Class 40 (ii)] Sounds are recorded on finely divided magnetic steel having a permeability of less than 50 and a coercive force of more than 250 oersteds. Steel alloys containing nickel, aluminium, cobalt, chromium, copper &c. are suitable. The particles are preferably between À001 and À005 m.m., and are mixed with a binder which may be a cellulose derivative, or a resinous material, or, when rigid supports are used, may be a metallic material having a lower melting point than the alloy. The composition may be applied as a thin film to cylindrical, disc, or film supports. The record may comprise a non-magnetic strip 1, Fig. 1, and a wider magnetic strip 2, wound spirally together and secured by adhesive, or the magnetic material may be secured spirally to both sides of the disc by adhesives (Fig. 2 and 3 not shown). The recording or reproducing needle, surrounded by a winding, may ride in the grooves between the magnetized ridges, and be carried by a magnetic hood which spans several grooves. Fig. 4 shows a recorder in which the magnetized member 14 and its winding 15 are held in a guide 16 having projections 17 sliding in adjacent grooves. Various methods of forming the record are described.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE512766X | 1936-11-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB512766A true GB512766A (en) | 1939-09-25 |
Family
ID=6548223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33081/37A Expired GB512766A (en) | 1936-11-30 | 1937-11-30 | Method and apparatus for recording and reproducing low frequency vibrations |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB512766A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2509012A (en) * | 1945-10-18 | 1950-05-23 | Morrison Montford | Magnetic disk record |
US2536030A (en) * | 1946-12-05 | 1951-01-02 | Armour Res Found | Electromagnetic transducer head |
US2537657A (en) * | 1945-05-05 | 1951-01-09 | Western Union Telegraph Co | Disk type magnetic recordingreproducing apparatus |
US2546850A (en) * | 1946-03-06 | 1951-03-27 | Jean Marie Achille Legrand | Means for engraving sound tracks on a support and reproducing sounds by scanning said tracks |
US2550803A (en) * | 1947-06-18 | 1951-05-01 | Rca Corp | Magnetic record |
US2593633A (en) * | 1947-04-29 | 1952-04-22 | Decca Record Co Ltd | Electrodynamic phonograph pickup |
US2594893A (en) * | 1945-01-09 | 1952-04-29 | Gen Electric | Magnetic recording medium |
US2721906A (en) * | 1952-07-16 | 1955-10-25 | Henry E Sharpe | Combined modulated groove and magnetic sound recording |
US2736775A (en) * | 1950-10-03 | 1956-02-28 | Armour Res Found | Magnetic transducer head assembly |
US2747027A (en) * | 1948-11-05 | 1956-05-22 | Armour Res Found | Recording apparatus and method for making duplicate magnetic records |
US2758905A (en) * | 1951-01-29 | 1956-08-14 | Univ California | Magnetic recording apparatus |
US2840440A (en) * | 1953-10-07 | 1958-06-24 | Donald J Mclaughlin | Magnetic recording and pickup system |
US2846517A (en) * | 1954-03-01 | 1958-08-05 | North American Aviation Inc | Magnetic head |
US2857476A (en) * | 1953-07-22 | 1958-10-21 | Joseph P Kleiber | System of electro-magnetic recording |
US2880279A (en) * | 1953-06-12 | 1959-03-31 | Bell Telephone Labor Inc | Sound recording and reproducing apparatus |
DE976728C (en) * | 1950-02-03 | 1964-03-26 | Hardidr Eberhard Priemer Chemi | Carrier for magnetograms |
-
1937
- 1937-11-30 GB GB33081/37A patent/GB512766A/en not_active Expired
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2594893A (en) * | 1945-01-09 | 1952-04-29 | Gen Electric | Magnetic recording medium |
US2537657A (en) * | 1945-05-05 | 1951-01-09 | Western Union Telegraph Co | Disk type magnetic recordingreproducing apparatus |
US2509012A (en) * | 1945-10-18 | 1950-05-23 | Morrison Montford | Magnetic disk record |
US2546850A (en) * | 1946-03-06 | 1951-03-27 | Jean Marie Achille Legrand | Means for engraving sound tracks on a support and reproducing sounds by scanning said tracks |
US2536030A (en) * | 1946-12-05 | 1951-01-02 | Armour Res Found | Electromagnetic transducer head |
US2593633A (en) * | 1947-04-29 | 1952-04-22 | Decca Record Co Ltd | Electrodynamic phonograph pickup |
US2550803A (en) * | 1947-06-18 | 1951-05-01 | Rca Corp | Magnetic record |
US2747027A (en) * | 1948-11-05 | 1956-05-22 | Armour Res Found | Recording apparatus and method for making duplicate magnetic records |
DE976728C (en) * | 1950-02-03 | 1964-03-26 | Hardidr Eberhard Priemer Chemi | Carrier for magnetograms |
US2736775A (en) * | 1950-10-03 | 1956-02-28 | Armour Res Found | Magnetic transducer head assembly |
US2758905A (en) * | 1951-01-29 | 1956-08-14 | Univ California | Magnetic recording apparatus |
US2721906A (en) * | 1952-07-16 | 1955-10-25 | Henry E Sharpe | Combined modulated groove and magnetic sound recording |
US2880279A (en) * | 1953-06-12 | 1959-03-31 | Bell Telephone Labor Inc | Sound recording and reproducing apparatus |
US2857476A (en) * | 1953-07-22 | 1958-10-21 | Joseph P Kleiber | System of electro-magnetic recording |
US2840440A (en) * | 1953-10-07 | 1958-06-24 | Donald J Mclaughlin | Magnetic recording and pickup system |
US2846517A (en) * | 1954-03-01 | 1958-08-05 | North American Aviation Inc | Magnetic head |
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