Title:
ACTUATOR DRIVING DEVICE, METHOD FOR CONTROLLING THE SAME, AND IMAGING APPARATUS
Document Type and Number:
Japanese Patent JP2015015823
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To control the amount of a current which can be supplied to a desired actuator when a plurality of actuators are driven simultaneously.SOLUTION: A motor driving device that drives motors 1 and 2 simultaneously changes the duty ratio of the output of a common terminal S according to a necessary amount of current. Duty ratio setting units 106A, 106B, and 106S set the duty ratios of outputs of half-bridge circuits 103A, 103B, and 103S according to a control signal from a current amount control unit 105. The amount of the current which can be supplied to the motor is increased as the duty ratio of the output of the half-bridge circuit connected to a terminal A or B decreases in control for causing a current to flow in a direction from the common terminal S toward the terminal A or B. The duty ratio of the output of the half-bridge circuit 103S is made small and the duty ratio of the output of the half-bridge circuit 103A or 103B is made large so as to increase the amount of the current which can be supplied to the motor in control for causing a current to flow in the direction from the terminal A or B toward the common terminal S.
Inventors:
KOBUNA HOROYO
Application Number:
JP2013140912A
Publication Date:
January 22, 2015
Filing Date:
July 04, 2013
Export Citation:
Assignee:
CANON KK
International Classes:
H02P8/40; H02P5/74
Attorney, Agent or Firm:
Ryoichi Takaoka