GB512766A - Method and apparatus for recording and reproducing low frequency vibrations - Google Patents

Method and apparatus for recording and reproducing low frequency vibrations

Info

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
Application number
GB33081/37A
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.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel AG
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 Dynamit Nobel AG filed Critical Dynamit Nobel AG
Publication of GB512766A publication Critical patent/GB512766A/en
Expired legal-status Critical Current

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

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.
GB33081/37A 1936-11-30 1937-11-30 Method and apparatus for recording and reproducing low frequency vibrations Expired GB512766A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (16)

* Cited by examiner, † Cited by third party
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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