US1949840A - Sound reproducing method - Google Patents
Sound reproducing method Download PDFInfo
- 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
- Authority
- US
- United States
- Prior art keywords
- magnetic
- backing
- reproducing method
- strip
- sound reproducing
- 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 - Lifetime
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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/842—Coating a support with a liquid magnetic dispersion
- G11B5/845—Coating 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.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1949840X | 1929-07-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1949840A true US1949840A (en) | 1934-03-06 |
Family
ID=9682491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US429220A Expired - Lifetime US1949840A (en) | 1929-07-24 | 1930-02-17 | Sound reproducing method |
Country Status (1)
Country | Link |
---|---|
US (1) | US1949840A (en) |
Cited By (23)
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 |
-
1930
- 1930-02-17 US US429220A patent/US1949840A/en not_active Expired - Lifetime
Cited By (23)
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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