Camera

Details Camera Camera

1994-05-12

1995-12-19

Gellner, Michael L.

G03B 310

Patent

active

054772982

ABSTRACT:
A camera having a zoom system which comprises a front lens group driven by a DC motor and a rear lens group driven by a stepping motor includes a motor control apparatus for controlling the DC motor and the stepping motor. The motor control apparatus voltage measuring means for measuring a voltage of a power source for driving the DC motor and the stepping motor, decision means for deciding as to whether the voltage is more than a predetermined value, means for simultaneously driving the DC motor and the stepping motor, if a decision is made that the voltage is more than the predetermined value, and means for driving only the DC motor and thereafter driving only the stepping motor, if the voltage is not more than the predetermined value.

REFERENCES:
patent: 5028945 (1990-09-01), Kashihara et al.
patent: 5241335 (1993-08-01), McIntyre
patent: 5298933 (1994-03-01), Chigira
patent: 5341190 (1994-08-01), Ogawa

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