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Publication numberDE2463178 A1
Publication typeApplication
Application numberDE19742463178
Publication date13 Jan 1983
Filing date18 Feb 1974
Priority date18 Feb 1974
Also published asDE2463178C2
Publication number19742463178, 742463178, DE 2463178 A1, DE 2463178A1, DE-A1-2463178, DE19742463178, DE2463178 A1, DE2463178A1, DE742463178
Export CitationBiBTeX, EndNote, RefMan
External Links: DPMA, Espacenet
Drive unit for video tape recorder - has electronically-commutated DC motor with bearings simultaneously acting as rotary head bearings
DE 2463178 A1
Abstract
The drive unit, for a video tape recorder, has an electronically-commutated d.c. motor driving the drum that carries the video head. The motor bearings simultaneously act as bearings for the rotating part of the drum. The fixed, stationary part of the drum is flanged to the motor's end-plate. Apart from the electronic commutation, another circuit regulates the head's phase and speed according to a reference signal. Since the drive uses electronic commutation all acoustic and electrical noise from brushes is avoided. The construction also increases the motor's efficiency by avoiding thermal losses to the rotating head.
Description  available in
Claims  available in
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
DE1933295A1 *1 Jul 196929 Jan 1970Akai ElectricKopfanordnung fuer ein Videomagnetbandgeraet
DE2328948A1 *4 Jun 197320 Dec 1973Matsushita Electric Ind Co LtdVideobandgeraet
US3333753 *17 Jun 19651 Aug 1967AmpexHelical scan magnetic tape apparatus with a squeeze film bearing
Classifications
International ClassificationH04N5/76, H04N5/782
Cooperative ClassificationH04N5/76, H04N5/782
Legal Events
DateCodeEventDescription
13 Jan 1983Q172Divided out of (supplement):
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10 Feb 19838181Inventor (new situation)
Free format text: BAITZ, GUENTER THUY, HANS-JOACHIM, DR., 1000 BERLIN, DE
28 Apr 19838110Request for examination paragraph 44
20 Jun 19848127New person/name/address of the applicant
Owner name: TELEFUNKEN FERNSEH UND RUNDFUNK GMBH, 3000 HANNOVE
8 Nov 1984ACDivided out of
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8 Nov 1984D2Grant after examination
9 May 19858364No opposition during term of opposition