DE873907C - Non-magnetic shaft for the sound motor - Google Patents

Non-magnetic shaft for the sound motor

Info

Publication number
DE873907C
DE873907C DEP7816D DEP0007816D DE873907C DE 873907 C DE873907 C DE 873907C DE P7816 D DEP7816 D DE P7816D DE P0007816 D DEP0007816 D DE P0007816D DE 873907 C DE873907 C DE 873907C
Authority
DE
Germany
Prior art keywords
sound
magnetic
motor
magnetic shaft
sound motor
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
Application number
DEP7816D
Other languages
German (de)
Inventor
Heinz Dr-Ing Luebeck
Johann Michel
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEP7816D priority Critical patent/DE873907C/en
Application granted granted Critical
Publication of DE873907C publication Critical patent/DE873907C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G11B15/28—Driving record carriers by members acting directly or indirectly thereon through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0007—Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information

Landscapes

  • Motor Or Generator Frames (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Description

Urmagnetische Welle für den Tonmotor Laufwerke für magnetische Schallaufzeichnungsgeräte werden üblicherweise mit einem Tonmotor konstanter Tourenzahl versehen, der für die Einhaltung einer konstanten. Geschwindigkeit des Tonbandes sorgt. Dies erfolgt in der Weise, daß gegen die auf die Tonmotorachse gesetzte Tonrolle eine Gummiandruckrolle drückt und zwischen beiden das Band. gefördert wird. Aus Gründen eines hinreichenden Gleichlaufes ist es zweckmäßig, die Tonrolle in der Nähe des Hörkopfes anzuordnen, jedoch bringt diese Anordnung den Nachteil, daß die üblicherweise aus Stahl hergestellte Welle des Tonmotors starke Brummstärungen auf den besonders empfindlichen Hörkopf induziert. Zur Behebung dieses Mangels wird erfindungsgemäß vorgeschlagen, den Tonmotor mit einer urmagnetischen Welle vorzugsweise aus einer harten Bronze zu versehen. Durch diese Maßnahme wird vermieden, daß das im Innern des Tonmotors herrschende magnetische Wechselfeld aus dem Tonmotor herausgeleitet wird.; auf den Hörkopf induzierte Brummstörungen lassen sich bei Anwendung des erfindungsgemäßen Verfahrens stark herabsetzen.Primordial magnetic shaft for the sound motor. Drives for magnetic sound recording devices are usually provided with a tone motor of constant number of revolutions, which for compliance with a constant. Speed of the tape. this happens in such a way that a rubber pressure roller is placed against the sound roller placed on the sound motor axis presses and between the two the band. is promoted. For the sake of a sufficient In the same direction, it is advisable to arrange the sound roll near the hearing head, however, this arrangement has the disadvantage that the one usually made of steel Wave of the sound motor strong hums on the particularly sensitive ear head induced. To remedy this deficiency, the invention proposes the sound motor to be provided with a primordial magnetic shaft, preferably made of a hard bronze. By this measure it is avoided that the prevailing inside the sound motor alternating magnetic field is conducted out of the sound motor .; induced on the ear head Humming interference can be severe when using the method according to the invention reduce.

Claims (2)

PATENTANSPRÜCHE: i. Verwendung einer urmagnetischen Welle für den Tonmotor bei magnetischen Schallaufzeichnung sgeräten. PATENT CLAIMS: i. Use of a primordial magnetic wave for the Sound motor in magnetic sound recorders. 2. Verwendung einer urmagnetischen Welle für eventuelle weitere Antriebsmotore in magnetischen Schallaufzeichnungsgeräten. Angezogene Druckschriften: Deutsche Patentschrift Nr. 722 250; schweizerische Patentschrift Nr. 212 67o; Journal of the Soc. of Motion Picture Eng. 48. 1947 14 bis 28.2. Use of a primordial magnetic shaft for any additional drive motors in magnetic sound recording devices. Cited publications: German Patent No. 722 250; Swiss Patent No. 212 67o; Journal of the Soc. of Motion Picture Eng. 48. 1947 14 to 28.
DEP7816D 1948-10-02 1948-10-02 Non-magnetic shaft for the sound motor Expired DE873907C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP7816D DE873907C (en) 1948-10-02 1948-10-02 Non-magnetic shaft for the sound motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP7816D DE873907C (en) 1948-10-02 1948-10-02 Non-magnetic shaft for the sound motor

Publications (1)

Publication Number Publication Date
DE873907C true DE873907C (en) 1953-04-20

Family

ID=7361386

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP7816D Expired DE873907C (en) 1948-10-02 1948-10-02 Non-magnetic shaft for the sound motor

Country Status (1)

Country Link
DE (1) DE873907C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH212670A (en) * 1938-10-06 1940-12-15 Lorenz C Ag Steel tone machine.
DE722250C (en) * 1936-02-09 1942-07-06 Bauer Eugen Gmbh Device for eliminating interference from sound reproduction devices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE722250C (en) * 1936-02-09 1942-07-06 Bauer Eugen Gmbh Device for eliminating interference from sound reproduction devices
CH212670A (en) * 1938-10-06 1940-12-15 Lorenz C Ag Steel tone machine.

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