DE747361C - Erase head for magnetic sound recordings - Google Patents
Erase head for magnetic sound recordingsInfo
- Publication number
- DE747361C DE747361C DEL111578D DEL0111578D DE747361C DE 747361 C DE747361 C DE 747361C DE L111578 D DEL111578 D DE L111578D DE L0111578 D DEL0111578 D DE L0111578D DE 747361 C DE747361 C DE 747361C
- Authority
- DE
- Germany
- Prior art keywords
- erase head
- sound recordings
- magnetic sound
- magnetic
- ideal
- 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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
- G11B5/03—Biasing
Description
Löschkopf für magnetische Tonaufzeichnungen Fei der magnetischen Tonaufzeichnung wird beispielsweise ein Stahldraht durch den dein Ton entsprechenden Wechselstronn niagnvtisiert. Der Grad des auf dem Stalildralit verbleibenden 11agnietismus dient dann in bukannter Weise zur Wiedergabe des Tones.Magnetic sound recording erase head For magnetic sound recording For example, a steel wire is passed through the alternating currents corresponding to your tone diagnosed. The degree of annietism remaining on the stalildralite is used then in a known manner to reproduce the sound.
Der innere Vorgang bei der Tonaufzeichnung besteht in einer Ausrichtung der ini urbesprochenen jungfräulichen Zustand in allen möglichen Richtungen in idealer Unordnung liegenden Molekularmagnete nach Maßgabe der angewendeten Magnetisierung.The inner process of recording sound is alignment the virginal condition originally discussed in all possible directions in ideal Disordered molecular magnets according to the applied magnetization.
Will man später die Tonaufzeichnung wieder löschen. so muß nian die Molekularniagnete möglichst wieder in ideale U nortinung bringen.If you want to delete the sound recording again later. so must nian die Bring molecular diagnostics back into ideal alignment if possible.
Uni dies zu erreichen, sind verschiedene Vorschläge bekanntgeworden. Unter ander,#ni hat inan versucht, durch gegen Null konvergierende Felder entgegengesetzter Richtung diese,ideale Unordnung herzustellen.Uni to achieve this, various proposals have become known. Among other things, # ni tried inan to use opposing fields converging to zero Direction to create this ideal disorder.
In der Abb. 1 ist ein Beispiel eines solche.i Löschkopfes gezeigt.An example of such an erase head is shown in Fig. 1.
Das gewünschte Ziel läßt sich mit den bisher bekanntgewordenen Löschköpfen nur teilweise erreichen, weil zunächst im Magnetfeld 1 alle lolelztilarin<ignete niit dein Nordpol nach unten gerichtet «-erden. Inn zweiten Magnetfeld wird dann ein Teil in entbegengesetzte Richtung gedreht. Dies setzt sich sinngemäß in den nachfolgenden llagn,_tfelderil «-eiter fort. Der Zustand der idealen Unordnung, bei dem überhaupt keine ausgezeichnete Richtung der ,@Iolehularmagncte vorhanden ist, liil:@t sich also so nicht erreichen.The desired target can be achieved with the extinguishing heads known so far only partially achieved, because initially all lolelztilarin <ignete in magnetic field 1 with your North Pole pointing downwards "- earth. Inn second magnetic field then becomes a part rotated in the opposite direction. This is reflected in the subsequent llagn, _tfelderil «-continued. The state of ideal disorder in which there is no distinctive sense of the, @ Iolehularmagncte at all is, liil: @t can not be reached in this way.
Uni den Zustand der idealen Unardntiii" und damit den jungfräulichen Zustand (h-,s "1'on-lrahts wierierherzustellen. wird ertindungsgemäß vorgeschlagen, die TonaufzeIchn-ung dadurch zu ldscli@n, daß rnan die 1Iagnete. die die Magnetfelder mit gegen Null konvergierender Stärke und wechselnder Richtung erzeugen, spiralig um den Draht anordnet.Uni the state of the ideal Unardntiii "and thus the virgin Condition (h-, s "1'on-lrahts can be produced. According to the invention, it is proposed the sound recording can be done by clipping the magnets. which the magnetic fields with strength converging towards zero and alternating direction, spiral arranges around the wire.
In Abb. a ist eine derartige- erhndun-sgenläße Anordnung skizziert. ' Der Übersichtlichkeit halber sind nur vi,#r Felder gezeigt. In der Praxis muß die Zahl naturgemäß bedeutend höher sein, uni die angestrebte Wirkung zu erreichen. Die Zahl der Pfeile in der Figur soll die magnetische L# eld#,t<irl,ze darstellen.In Fig. A, such an elongated arrangement is sketched. For the sake of clarity, only vi, # r fields are shown. In practice it must the number should naturally be significantly higher in order to achieve the desired effect. The number of arrows in the figure is intended to represent the magnetic L # eld #, t <irl, ze.
Die abnehmende Feldstärke der einzelnen :Magnetfelder kann beispielsweise durch zrinehmenden Luftspalt erzielt werden.The decreasing field strength of the individual: magnetic fields can for example can be achieved by narrowing the air gap.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL111578D DE747361C (en) | 1942-04-17 | 1942-04-17 | Erase head for magnetic sound recordings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL111578D DE747361C (en) | 1942-04-17 | 1942-04-17 | Erase head for magnetic sound recordings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE747361C true DE747361C (en) | 1944-09-22 |
Family
ID=7290480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEL111578D Expired DE747361C (en) | 1942-04-17 | 1942-04-17 | Erase head for magnetic sound recordings |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE747361C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2908768A (en) * | 1955-04-13 | 1959-10-13 | Steinegger Giovanni | Device for demagnetizing the magnetized wire of a sound recording and reproducing apparatus |
| US3519760A (en) * | 1966-12-30 | 1970-07-07 | Ibm | Magnetic duplicating apparatus using a multiple gap d.c. head |
-
1942
- 1942-04-17 DE DEL111578D patent/DE747361C/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2908768A (en) * | 1955-04-13 | 1959-10-13 | Steinegger Giovanni | Device for demagnetizing the magnetized wire of a sound recording and reproducing apparatus |
| US3519760A (en) * | 1966-12-30 | 1970-07-07 | Ibm | Magnetic duplicating apparatus using a multiple gap d.c. head |
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