Stepping motor and magnetic disc reproducing apparatus using the

Details Stepping motor and magnetic disc reproducing apparatus using the Stepping motor and magnetic disc reproducing apparatus using the

1987-07-01

1988-11-01

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68B, 310 49R, 310156, H02K 1100

Patent

active

047822554

ABSTRACT:
A stepping motor for use in a magnetic disc reproducing apparatus for causing radial scanning movement of a magnetic head relative to a magnetic disc having many picture information recorded on concentric tracks, comprises a casing, a rotor, stator coils to which current is supplied according to a sequence of phase cycles, and a rotor positions detector which includes two electrically-connected contactors mounted on the rotor, and an annular conductor pattern and an arcuate conductor pattern provided in the casing to make continuous and temporary contact with the respective contactors. The arcuate conductor pattern covers a range corresponding to an angle through which the rotor rotates in a predetermined one cycle among the phase cycles of current supply to the coils.

REFERENCES:
patent: 4242608 (1980-12-01), Ishigaki et al.
patent: 4455516 (1984-06-01), Furusho
patent: 4459087 (1984-07-01), Barge
patent: 4639648 (1987-01-01), Sakamoto
patent: 4658162 (1987-04-01), Koyama et al.
patent: 4667122 (1987-05-01), Muller
patent: 4668884 (1987-05-01), Amo et al.

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