Motor drive unit and optical apparatus

Details Motor drive unit and optical apparatus Motor drive unit and optical apparatus

2009-01-27

2011-10-11

Duda, Rina (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

C318S280000, C318S282000

Reexamination Certificate

active

08035327

ABSTRACT:
A motor drive unit includes a controller configured to drive a motor to a target position by using a first driving mode in which a state of energization of coils of the motor is switched in accordance with outputs from rotor position detectors and a second driving mode in which a state of energization of the coils is switched on the basis of a predetermined time interval. The controller turns on the energization of the coils during a predetermined time under an energization condition at a completion of driving to the target position when the rotor position detectors detect that the rotor position shifts from the target position after turning off the energization of the coils according to the completion of driving to the target position.

REFERENCES:
patent: 6483270 (2002-11-01), Miyazaki et al.
patent: 6747433 (2004-06-01), Kuwano et al.
patent: 6826499 (2004-11-01), Colosky et al.
patent: 7149419 (2006-12-01), Akada
patent: 7323834 (2008-01-01), Kimura et al.
patent: 2566031 (1996-12-01), None
patent: 10-282395 (1998-10-01), None

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