Equipment for minimizing the power loss in a step motor in a cam

Details Equipment for minimizing the power loss in a step motor in a cam Equipment for minimizing the power loss in a step motor in a cam

1974-10-24

1976-10-19

Peters, Jr., Joseph F.

354271, G03B 708, G03B 902

Patent

active

039874621

ABSTRACT:
A camera has a step motor for stepwise adjustment of the value of an exposure factor. When the value of the exposure factor differs from the desired value a pulse generator furnishes a series of pulses to a ring counter which in turn connects each of the energizing windings of the step motor to a reference potential. The step motor rotates until the desired exposure factor value has been achieved and the pulse sequence ceases. A transistor is connected between the battery and the second terminals of all the windings and is maintained in a conductive state only in the presence of the pulses from the pulse generator. When the exposure factor is at the desired value and no further rotation of the step motor is required all windings are deenergized therefore decreasing the power loss in the motor.

REFERENCES:
patent: 3226574 (1965-12-01), Winkler
patent: 3430117 (1969-02-01), Sennhenn
patent: 3587112 (1971-06-01), Hill
patent: 3813680 (1974-05-01), Wagensonner et al.

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