DE859820C - Arrangement of the shielding for electrical sound reproduction devices - Google Patents
Arrangement of the shielding for electrical sound reproduction devicesInfo
- Publication number
- DE859820C DE859820C DEB13300A DEB0013300A DE859820C DE 859820 C DE859820 C DE 859820C DE B13300 A DEB13300 A DE B13300A DE B0013300 A DEB0013300 A DE B0013300A DE 859820 C DE859820 C DE 859820C
- Authority
- DE
- Germany
- Prior art keywords
- hearing
- shielding
- head
- tonearm
- hearing head
- 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
- G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Description
Die Erfindung .betrifft Tonwiedergabegeräte für Tonaufzeichnungen, die mit schallplattenförmigen Tonträgern und magnetischen Aufzeichnungsj und Abtastverfahren arbeiten. Der Hörkopf ist bei diesen Geräten an eineng Torarm befestigt, -der ähnlich wie der Tonarm des bekannten Schallplatterispielers_ über die von einem Elektromotor in Umdrehung-- versetzte Magrettonplatte hinweggeführt wird. Dabei werden durch den Magnetismus des Tonträgers im Magnetsystem des Hörkopfes Wechselspannungen induziert, die hörbar gemacht werden.The invention relates to sound reproduction devices for sound recordings, those with phonograms in the form of phonograms and magnetic recording and scanning processes work. In these devices, the ear head is attached to a gate arm, which is similar like the tonearm of the well-known record player via that of an electric motor in rotation - shifted Magrettonplatte is led away. Thereby are through the magnetism of the sound carrier induces alternating voltages in the magnetic system of the hearing head, which are made audible.
Außer diesen Nutzspannungen werden durch'das magnetische Wechselfeld der Stromversorgung aber auch Brummspannungen in dem sehr -empfindlichen Hörkopf induziert, gegen` die umständliche Abschirmmaßnahmen getroffen werden müssen. Besonders störwirksam ist- das Magnetfeld des Antriebsmotors. Die Brummstörungen machten -sich naturgemäß besonders bemerkbar bei sehr kleiner Nutzmodulationsspannung und dann, wenn der Tonarm mit dem Hörkopf in Pausen auf der Ablagestütze seitlich des Plattentellers ruht und der Verstärker eingeschaltet ist.In addition to these useful voltages, the alternating magnetic field the power supply but also ripple voltages in the very sensitive ear head induced against which cumbersome shielding measures have to be taken. Particularly the magnetic field of the drive motor is disruptive. The hum disturbances made themselves naturally particularly noticeable with very low useful modulation voltage and then, when the tonearm with the hearing head pauses on the support on the side of the turntable idle and the amplifier is switched on.
Nach der Erfindung wird zur Vermeidung des Übelstandes vorgeschlagen, das hauptsächlich von der Unterseite der Werkplatte des Wiedergabegerätes her wirkende Störfeld in allen Bereichen, die von dem Tonarm überstrichen werden, durch einen hochpermeablen Werkstoff, vorzugsweise in an sich bekannter Weise Mu-Metall; abzuschirmen und diese Abschirmung mit der an sich vorhandenen Äbschirmüng des Tonarmes so*'äüszubilden, daß eine möglichst geschlossene Abschirmung um das Mägnetsystem des Hörkopfes entsteht.According to the invention it is proposed to avoid the inconvenience, that acts mainly from the underside of the work plate of the playback device Interference field in all areas that are swept by the tonearm by one highly permeable material, preferably mu-metal in a manner known per se; shield and to form this shielding with the shielding of the tonearm, which is actually present, that a shielding that is as closed as possible is created around the magnetic system of the hearing head.
Für die Ausführung des Erfindungsgedankens -zeigt die Zeichnung ein Beispiel. Sie stellt in Fig. i in Draufsicht ein Widergabegerät mit Tonarm i und Plattenteller 2 dar, die Zeichenebene bedeutet die Werkplatte des Gerätes. Der Plattenteller und die Umgebung der Ruhestütze 3 des Ton- -armes werden erfindungsgemäß durch ein Blech S aus Mu-Metall abgeschirmt. Dabei wird die Ruhestütze mit Vorteil so ausgebildet, wie Fig. 2 zeigt, daß zusammen mit der tief herabgezogenen Abschirmung des Tonarmes der Tonkopf praktisch allseitig abgeschirmt ist. -Durch diese Maßnahme läßt sich die Einstreuung des .Störfeldes während des Abspielens und in der Ruhelage auf ein praktisch nicht mehr wirksames Maß herabdrücken. Es `kann von Vorteil sein, die Plattentellerachse 4 mindestens in ihrem über die Werkplatte herausragenden Teil aus einem unmagnetischen= Werkstoff, z. B!. Bronze, herzustellen.For the implementation of the inventive idea -shows a Example. It represents in Fig. I in plan view of a playback device with tonearm i and Platter 2 represents, the plane of the drawing means the work plate of the device. The turntable and the surroundings of the rest support 3 of the tone arm are according to the invention by a Sheet metal S shielded from mu-metal. The rest support is advantageously designed in such a way that as Fig. 2 shows that together with the deeply pulled down shielding of the tonearm the sound head is shielded practically on all sides. -This measure can be used the interspersion of the .störfeldes during playback and in the rest position on practically no longer effective lowering. It` can be beneficial that Turntable axis 4 at least in its part protruding beyond the work plate from a non-magnetic = material, e.g. B !. Bronze to manufacture.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB13300A DE859820C (en) | 1951-01-11 | 1951-01-11 | Arrangement of the shielding for electrical sound reproduction devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB13300A DE859820C (en) | 1951-01-11 | 1951-01-11 | Arrangement of the shielding for electrical sound reproduction devices |
Publications (1)
Publication Number | Publication Date |
---|---|
DE859820C true DE859820C (en) | 1952-12-15 |
Family
ID=6957495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB13300A Expired DE859820C (en) | 1951-01-11 | 1951-01-11 | Arrangement of the shielding for electrical sound reproduction devices |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE859820C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1160208B (en) * | 1958-07-01 | 1963-12-27 | Tdk Electronics Co Ltd | Protective cover for shipping a sheet-shaped magnetogram carrier |
-
1951
- 1951-01-11 DE DEB13300A patent/DE859820C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1160208B (en) * | 1958-07-01 | 1963-12-27 | Tdk Electronics Co Ltd | Protective cover for shipping a sheet-shaped magnetogram carrier |
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