Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1982-06-08
1984-09-11
Perkey, William B.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318139, G03B 118, H02P 100
Patent
active
044706782
ABSTRACT:
An electric motor drive device for film winding. The conventional motor drive devices include a type in which the motor is normally kept in an operative state under a no load condition and the rotation force thereof is transmitted to a film winding mechanism during film winding. Another type actuates the motor during film winding. In the former arrangement, keeping the motor in an operative state requires less power consumption for actuating the motor and also eliminates the problem of delayed start. However, since the motor receives power even under a no load condition, a high voltage is impressed on the motor to cause vibration, beat, or the like even under a no load condition, thus causing camera vibration resulting in a blurred picture. In accordance with the present invention, this shortcoming of the conventional device is eliminated by differentiating control over the power supply to the motor under a no load condition from a power supply control in a film winding condition to ensure that no high voltage is impressed on the motor under a no load condition.
REFERENCES:
patent: 3510743 (1970-05-01), Mortimer
patent: 3891312 (1975-06-01), Aizawa et al.
patent: 3909835 (1975-09-01), Ito et al.
patent: 4002959 (1977-01-01), Schadlich et al.
patent: 4148570 (1979-04-01), Ichiyanagi
patent: 4367937 (1983-01-01), Mashimo et al.
Canon Kabushiki Kaisha
Perkey William B.
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