US1949840A - Sound reproducing method - Google Patents

Sound reproducing method Download PDF

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Publication number
US1949840A
US1949840A US429220A US42922030A US1949840A US 1949840 A US1949840 A US 1949840A US 429220 A US429220 A US 429220A US 42922030 A US42922030 A US 42922030A US 1949840 A US1949840 A US 1949840A
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US
United States
Prior art keywords
magnetic
backing
reproducing method
strip
sound reproducing
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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 - Lifetime
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US429220A
Inventor
Languepin Jacques Emile
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.)
RCA Corp
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RCA Corp
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1949840A publication Critical patent/US1949840A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/842Coating a support with a liquid magnetic dispersion
    • G11B5/845Coating a support with a liquid magnetic dispersion in a magnetic field

Definitions

  • the object of this invention is to provide for the replacing of the wire by a special strip adapted to do away with the above mentioned inconveniences and to ensure a number of further advantages.
  • the strip used for registering is advantageously formed of a resilient support or backing made of nonmagnetic material and one face of which is covered with iron, steel or a special alloy endowed with the magnetic properties best calculated to foster registration and reproduction.
  • the portion forming the backing may be made of paper and the magnetic metal may be laid on the surface thereof, either as a thin strip stuck thereon or as metal powder or filings fixed thereon by any suitable means.
  • any of the common methods used in metallized paper manufacturing practice may be used, as well as the well known method of spray metallization or any other process.
  • I may also substitute for the powder or filings elements of small size but of known and defined shape such as, for instance, suitably sized wire elements or parts of any other shape.
  • I may cover it with a second very thin strip or layer of nonmagnetic material fixed by any suitable means to the backing,
  • paper for constituting the strip or layer is indicated merely as an example and the paper may be replaced by any other nonmagnetic material and even by metal.
  • the strip or layer, so made and serving for registering, may be holed, notched or indented so as Application February 17, 1930,
  • the strip may also include a free portion arranged in any suitable manner so as to permit of notes, references, drawings or photographic images being inscribed or imprinted by any convenient method. In this manner, such bands or strips will be usable also for kinematographic registering.
  • I may use a transparent backing and cause the magnetic metal element to be laid only on part of the surface, or again, where possible, make use of the images through refiection.

Description

Patented Mar. 6, 1934 UNITED STATES SOUND REPRODUCING METHOD Jacques Emile Languepin, Paris, France, assignor to Radio Corporation of America, New York, N. Y., a corporation of Delaware No Drawing.
Serial No. 429,220.
4 Claims.
It has already been proposed for the purpose of registering sounds, noises, music, words or otherwise produced vibrations, to use a steel wire passing through a magnetic field the variations 5 of which are dependent upon the vibrations of a microphone.
Devices hitherto constructed in accordance with the foregoing method do not appear to have given perfect results and it would seem as if one of the chief difiiculties encountered arose from the mutual influence of adjacent magnetized masses. On the other hand, the required use of a wire, offering some resiliency so as to permit of the same being handled, bars the use of special alloys which, while but little ductile, would be endowed with a higher magnetic susceptibility and a steadier power of resistance.
The object of this invention is to provide for the replacing of the wire by a special strip adapted to do away with the above mentioned inconveniences and to ensure a number of further advantages.
I have found that the strip used for registering, according to the well known method, is advantageously formed of a resilient support or backing made of nonmagnetic material and one face of which is covered with iron, steel or a special alloy endowed with the magnetic properties best calculated to foster registration and reproduction.
The portion forming the backing may be made of paper and the magnetic metal may be laid on the surface thereof, either as a thin strip stuck thereon or as metal powder or filings fixed thereon by any suitable means. For this purpose any of the common methods used in metallized paper manufacturing practice may be used, as well as the well known method of spray metallization or any other process. I may also substitute for the powder or filings elements of small size but of known and defined shape such as, for instance, suitably sized wire elements or parts of any other shape.
In all cases, I am able, at the time when such elements are being fixed on the backing, to ensure their setting in a predetermined direction by causing a constant magnetic field to take action thereon, the resulting permanent magnetization being next annulled by a well known method.
In order to protect said sensitive layer, which might prove trail, I may cover it with a second very thin strip or layer of nonmagnetic material fixed by any suitable means to the backing,
or varnished, or enamelled on.
The use of paper for constituting the strip or layer is indicated merely as an example and the paper may be replaced by any other nonmagnetic material and even by metal.
The strip or layer, so made and serving for registering, may be holed, notched or indented so as Application February 17, 1930,
In France July 24, 1929 to ensure a steady drive or feed. It may also be goflered in such a manner that, while remaining sufficiently resilient or yielding, it will permit of the various turns being kept spaced on being wound on the drum.
The strip may also include a free portion arranged in any suitable manner so as to permit of notes, references, drawings or photographic images being inscribed or imprinted by any convenient method. In this manner, such bands or strips will be usable also for kinematographic registering.
In the latter case I may use a transparent backing and cause the magnetic metal element to be laid only on part of the surface, or again, where possible, make use of the images through refiection.
Having now particularly ascertained and described the nature of my said invention as well as the manner in which the same is to be performed I declare that what I claim is:
1. The method of forming a magnetic sound record strip composed of a backing of non-magnetic material and an active magnetic layer composed of a powder of magnetic material which comprises utilizing a constant magnetic field for setting the magnetic material as it is laid upon the backing material and thereafter annulling the resultant permanent magnetization.
2. The method of forming a magnetic sound record strip composed of a non-magnetic backing material and a layer of magnetic particles which comprises subjecting said particles during their application to said backing to a constant magnetic field for arranging them in a definite relation to said backing.
3. The method of forming a magnetic sound record strip composed of a backing of non-magnetic material and an active magnetic layer composed of a powder of magnetic material which includes laying said magnetic material upon said backing, and subjecting it to a constant magnetic field for setting its particles in a predetermined direction during their application to said backing.
4. The method of forming a magnetic sound record strip composed of a backing of non-magnetic material and an active magnetic layer composed of a powder of magnetic material which includes laying said magnetic material upon said backing, subjecting it to a constant magnetic field for setting its particles in a predetermined direction, and protecting the active layer thus formed by the addition of a second layer of nonmagnetic material.
JACQUES EMILE LANGUEPIN.
US429220A 1929-07-24 1930-02-17 Sound reproducing method Expired - Lifetime US1949840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1949840X 1929-07-24

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535486A (en) * 1946-08-16 1950-12-26 Brush Dev Co Magnetic record transducing apparatus having a backing element for coupling a recordtape to the magnetic head
US2536029A (en) * 1946-12-05 1951-01-02 Armour Res Found Magnetic record member
US2547948A (en) * 1947-07-21 1951-04-10 Brush Dev Co Process for forming magnetic record members from a papermaking fiber slurry
US2566441A (en) * 1946-04-29 1951-09-04 Armour Res Found Magnetic record medium and method of making the same
US2582590A (en) * 1946-08-15 1952-01-15 Armour Res Found Method of making magnetic material
US2610062A (en) * 1949-09-07 1952-09-09 Brush Dev Co Indexing system
US2610257A (en) * 1949-12-22 1952-09-09 Warner Bros Magnetic record volume control
US2629784A (en) * 1945-01-17 1953-02-24 Fred B Daniels Wide frequency-range magnetic recording and reproducing system
US2631855A (en) * 1947-09-27 1953-03-17 Brush Dev Co Magnetic recording and reproducing
US2633431A (en) * 1947-12-20 1953-03-31 Shellmar Products Corp Magnetic recording tape and method of making same
US2668718A (en) * 1946-12-21 1954-02-09 Int Electronics Co Magnetic letterhead
US2677728A (en) * 1946-10-23 1954-05-04 British Acoustic Films Ltd Process of and apparatus for developing visible sound records synchronized with invisible recordings on magnetic tapes
US2686676A (en) * 1949-04-08 1954-08-17 Dictaphone Corp Recording progress indicator for magnetic records
US2692843A (en) * 1950-04-22 1954-10-26 Eaton Mfg Co Magnetic lining for clutches and brakes and method of making same
US2699408A (en) * 1950-03-24 1955-01-11 Armour Res Found Magnetic record member
US2711901A (en) * 1952-05-21 1955-06-28 Minnesota Mining & Mfg Magnetic recording tape and method of making same
US2714010A (en) * 1948-07-07 1955-07-26 Presto Recording Corp Magnetic transducing unit
US2714133A (en) * 1952-06-18 1955-07-26 Barry Leonard Dodge Magnetic shielding medium
US2747027A (en) * 1948-11-05 1956-05-22 Armour Res Found Recording apparatus and method for making duplicate magnetic records
US2781549A (en) * 1952-04-19 1957-02-19 John R Milne Method of molding articles having spaced discontinuities therein
US2796359A (en) * 1952-07-05 1957-06-18 Audio Devices Inc Production of magnetic sound recording tape
US3117065A (en) * 1959-09-02 1964-01-07 Magnetic Film And Tape Company Method and apparatus for making magnetic recording tape
US3186707A (en) * 1954-05-04 1965-06-01 Banning Magnetizable tape and the like, for signal carriers

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629784A (en) * 1945-01-17 1953-02-24 Fred B Daniels Wide frequency-range magnetic recording and reproducing system
US2566441A (en) * 1946-04-29 1951-09-04 Armour Res Found Magnetic record medium and method of making the same
US2582590A (en) * 1946-08-15 1952-01-15 Armour Res Found Method of making magnetic material
US2535486A (en) * 1946-08-16 1950-12-26 Brush Dev Co Magnetic record transducing apparatus having a backing element for coupling a recordtape to the magnetic head
US2677728A (en) * 1946-10-23 1954-05-04 British Acoustic Films Ltd Process of and apparatus for developing visible sound records synchronized with invisible recordings on magnetic tapes
US2536029A (en) * 1946-12-05 1951-01-02 Armour Res Found Magnetic record member
US2668718A (en) * 1946-12-21 1954-02-09 Int Electronics Co Magnetic letterhead
US2547948A (en) * 1947-07-21 1951-04-10 Brush Dev Co Process for forming magnetic record members from a papermaking fiber slurry
US2631855A (en) * 1947-09-27 1953-03-17 Brush Dev Co Magnetic recording and reproducing
US2633431A (en) * 1947-12-20 1953-03-31 Shellmar Products Corp Magnetic recording tape and method of making same
US2714010A (en) * 1948-07-07 1955-07-26 Presto Recording Corp Magnetic transducing unit
US2747027A (en) * 1948-11-05 1956-05-22 Armour Res Found Recording apparatus and method for making duplicate magnetic records
US2686676A (en) * 1949-04-08 1954-08-17 Dictaphone Corp Recording progress indicator for magnetic records
US2610062A (en) * 1949-09-07 1952-09-09 Brush Dev Co Indexing system
US2610257A (en) * 1949-12-22 1952-09-09 Warner Bros Magnetic record volume control
US2699408A (en) * 1950-03-24 1955-01-11 Armour Res Found Magnetic record member
US2692843A (en) * 1950-04-22 1954-10-26 Eaton Mfg Co Magnetic lining for clutches and brakes and method of making same
US2781549A (en) * 1952-04-19 1957-02-19 John R Milne Method of molding articles having spaced discontinuities therein
US2711901A (en) * 1952-05-21 1955-06-28 Minnesota Mining & Mfg Magnetic recording tape and method of making same
US2714133A (en) * 1952-06-18 1955-07-26 Barry Leonard Dodge Magnetic shielding medium
US2796359A (en) * 1952-07-05 1957-06-18 Audio Devices Inc Production of magnetic sound recording tape
US3186707A (en) * 1954-05-04 1965-06-01 Banning Magnetizable tape and the like, for signal carriers
US3117065A (en) * 1959-09-02 1964-01-07 Magnetic Film And Tape Company Method and apparatus for making magnetic recording tape

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