US1846531A - Electromagnetic recording arrangement for acoustic vibrations - Google Patents

Electromagnetic recording arrangement for acoustic vibrations Download PDF

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Publication number
US1846531A
US1846531A US354685A US35468529A US1846531A US 1846531 A US1846531 A US 1846531A US 354685 A US354685 A US 354685A US 35468529 A US35468529 A US 35468529A US 1846531 A US1846531 A US 1846531A
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US
United States
Prior art keywords
steel
recording
steel bar
bar
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
Application number
US354685A
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English (en)
Inventor
Stille Curt
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.)
TELEGRAPHIE PATENT SYNDIKAT
Telegraphie-Patent-Syndikat G M B H
Original Assignee
TELEGRAPHIE PATENT SYNDIKAT
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 TELEGRAPHIE PATENT SYNDIKAT filed Critical TELEGRAPHIE PATENT SYNDIKAT
Application granted granted Critical
Publication of US1846531A publication Critical patent/US1846531A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G11B5/004—Recording on, or reproducing or erasing from, magnetic drums

Definitions

  • GERMANY assrouon T0 TELEGmHIE-PATEN -SYNDIKAT o. Ill. 3.
  • BL or BERLIN
  • JVhen steel wire is employed as the record carrier, the conditions are much more favourable in every respect. Electromagnets with a closed magnetic circuit may be used and sui able means may be employed for causing the wire to travel smoothly past the magnet cores. Hence, it has been possible to construct apparatus which may be said to work in a very satisfactory manner.
  • the applicant has constructed an apparatus, the construction of which is protected by a number of patents and which is used mainly as a dictating apparatus.
  • the applicant having also succeeded in recording and reproducing artistic performances, music, and the like, in a perfect manner, it would appear to be obvious to use such constructions for the purposes mentioned above, but there are a number of pertinent reasons to use other constructional forms for such apparatus which, to put it shortly, replace the well-known disk gramophone of to-day.
  • An electro-magnetic gramophone is intended 'for the use of the general public and must therefore be as simple as possible as regards its construction and operation, at any rate, not more complicated than the gramophone with sound disc now in common use.
  • the question of price also plays a great part and the record carrier must, as regards handiness and reliability in operation hear every comparison with the sound disc as at present used.
  • the arrangement according to the invention consists in this that the carrier "for recording and reproducing the acoustic vibrations is neither a steel disc nor a steel wire, but a relatively thin steel tube or a steel bar, which, both when recording and reproducing, has a rotary motion imparted to it and along which the recording or the reproducing electromagnet is caused to travel by means of a leading screw, so that the electro-magnetic waves are traced helically on the carrier or the waves traced helically on it excite the talkinghead (magnetic system) which is caused to travel along it axially.
  • the arrangement is preferably such that two such carriers, (steel 'bar or steel tube) are mounted in the apparatus in such a manner that first a carrier 1 is put in rotation, the peripheral surface of which is swept over by the recording magnet. Before the steel bar 1 is completely traversed, the steel bar 2 is put in motion, the recording magnet, aiter completely traversing the steel bar 1, being transferred by a change-over device to the steel bar 2, so that the recording operation proceeds without a pause on the steel bar 1 and the steel bar 2.
  • the steel bar 1 which for this purpose is mounted in the recording or reproducing apparatus, so as to be readily removable therefrom, can be easily replaced, so that in this constructional form of the recording or reproducing'apparatus uninterrupted recording or reproduction can be carried out.
  • FIG. 1 of the accompanying drawings a recording arrangement according to the invention is shown diagrammatically, Figures 2 and 3 being an end view and a side elevation of a portion of a reproducing apparatus.
  • M is the recording microphone which, by means of the amplifying arrangement V excites the recording magnet A.
  • 1 and 2 are the two exchangeable steel bars, along which the recording magnet A is caused to travel by means of the spindles 79 and 19 on the guiding bar 6.
  • changeover devices which eilect the swinging over of the recording magnet to the steel bar 1 or 2 are omitted.
  • the starting and stopping means for operatin the steel ars 1 and 2 are also omitted. These devices are controlled by the traversing means of the recording magnet on the guiding bar 5.
  • FIG 1 two leading screws 17 and 10 are shown of which p pushes the recording magnet on the steel bar 1 from the left to the right, while the leading screw p pushes the recording magnet on the steel bar 2 from the right to the left.
  • a single reversible leading screw may, of course, be used instead.
  • means instead of rocking the recording magnet on to the steel bars 1 and 2 means may be provided for pushing two or more steel bars or tubes successively under the cores of the recording electromagnets.
  • the steel bars or steel tubes for the reproducing or recording carrier are provided at one end with a point which acts as a bearing centre while the other unpointed end is provided with a groove in which a rib on the driving shaft of the apparatus engages, whereby the rotary motion is transmitted from the driving shaft to the recording or reproducing carrier.
  • 1 and 2 are the steel bars forming the reproducing carriers.
  • the steel bar 1 is first caused to rotate and the talkipg head A is caused by-the leading screw 6 and the guiding bar a to slide along the steel bar 1.
  • the steel bar 2 commences to rotate.
  • the release of this steel bar is efifected by small mechanical controlling device, which for instance is operated through the talking-head in sliding along the guiding bar a releasing a small detent which allows the mechanism for rotating the steel bar 2 to come into operation.
  • the mechanism for rotating the steel bar 1 is brought to rest by a mechanical controlling device, the talking-head A being at the same time rocked over on to the steel bar 2, so that it will slide in the opposite direction on the steel bar 2.
  • the steel bar 1 may be exchanged and, after the talking-head has reached the end of the steel bar 2, the changing-over operation is repeated in exactly the same way, as described with reference to the changingover of the talking-head from the steel bar 1 to the steel bar 2. In this way very long pieces of music may be played without any interruption in the performance.
  • the apparatus may, of course, also be so constructed that the two steel bars run continuously, the talking head only being rocked over to one or the other steel bar.
  • the controlling device for starting or stopping one or the other steel bar would be reeaeei superfluous. ifhis is a question of the amonnt of available power for driving the apparatus, which may, of course, be smaller it only one steel bar runs at a tiime.
  • the apparatus already constructed, which make use of a steel wire as the record cerrier only an electric motor can he used for providing the driving power, as the reliable starting of two wire reels or relatively great weight reqniresa My fairly high driving energy.
  • ordinary spring-driven motors such as are, for instance, used for driving the Well-known discv to talking machines, may be employed, which has the further advantage of cheapness and reliability in operation.
  • electromagnetic recording and reproducing apparatus comprising a pair of parolespaced steel hare, eech loar losing of considerahly greater length than diameter provide recording and reproducing carriers, guiding har, a reproducing or recording magnet, a supporting memloer for the magnet movable on the guide bar, a pair of lead screws, means forshifting the supporting memher for alternate engagement wit the lead screws to cause the magnet to alterengage said thin bars and more the same longitudinally thereof.

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  • Recording Or Reproducing By Magnetic Means (AREA)
  • Moving Of Heads (AREA)
US354685A 1928-09-26 1929-04-12 Electromagnetic recording arrangement for acoustic vibrations Expired - Lifetime US1846531A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE141087X 1928-09-26

Publications (1)

Publication Number Publication Date
US1846531A true US1846531A (en) 1932-02-23

Family

ID=5668510

Family Applications (1)

Application Number Title Priority Date Filing Date
US354685A Expired - Lifetime US1846531A (en) 1928-09-26 1929-04-12 Electromagnetic recording arrangement for acoustic vibrations

Country Status (5)

Country Link
US (1) US1846531A (da)
AT (1) AT125469B (da)
CH (1) CH141087A (da)
DK (1) DK44348C (da)
FR (1) FR681288A (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610257A (en) * 1949-12-22 1952-09-09 Warner Bros Magnetic record volume control
US2672346A (en) * 1946-12-21 1954-03-16 Int Electronics Co Office dictation and intercommunication system
US2816174A (en) * 1952-04-26 1957-12-10 Rca Corp Magnetic compression system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672346A (en) * 1946-12-21 1954-03-16 Int Electronics Co Office dictation and intercommunication system
US2610257A (en) * 1949-12-22 1952-09-09 Warner Bros Magnetic record volume control
US2816174A (en) * 1952-04-26 1957-12-10 Rca Corp Magnetic compression system

Also Published As

Publication number Publication date
DK44348C (da) 1931-07-13
AT125469B (de) 1931-11-25
FR681288A (fr) 1930-05-13
CH141087A (de) 1930-07-15

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