Head drum assembly for use in a video cassette recorder

Details Head drum assembly for use in a video cassette recorder Head drum assembly for use in a video cassette recorder

1995-09-22

1998-03-31

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 90, 310 905, 360107, 360 84, 36013024, 360108, H02K 700, H02K 708, G11B 552

Patent

active

057342130

ABSTRACT:
A head drum assembly for use in a VCR comprises a rotating shaft; a rotary drum; a stationary drum fitted around the rotating shaft; a pair of bearing assemblies that allow the rotating shaft and the rotating drum to rotate easily; a motor rotor; a motor stator; an electromagnet of a predetermined polarity, placed on a bottom surface of the motor stator, and activated by a voltage applied to it when the rotary drum is rotating; a permanent magnet, having the same polarity as the electromagnet, and being placed on an upper surface of the motor rotor opposite the electromagnet. Such a head drum assembly achieves smooth rotation of its rotary drum by applying the necessary pressure uniformly along an inner ring of its bearing assembly. Furthermore, by selectively applying pressure to the inner ring of the bearing assembly only at times of operation, i.e., when the rotary drum is rotating, the inventive head drum assembly minimizes wear and tear of the bearing assemblies, prolonging their lifespan.

REFERENCES:
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patent: 5392180 (1995-02-01), Hasegawa
patent: 5442506 (1995-08-01), Kang
patent: 5471104 (1995-11-01), Toshimitsu et al.
patent: 5515220 (1996-05-01), Alioth

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