Motor drive controller for controlling movement and stop by motor and camera apparatus

An electronic apparatus, comprising:

• a mechanism unit composed of a given mechanism section and a DC motor for moving the mechanism section;
• a motor driver for outputting a drive signal for driving the DC motor according to inputted command;
• and
• a control section for controlling contents and timing of the command outputted to the motor driver in order to move the mechanism section to a designated position,
• the drive signal is defined as a signal for controlling electrical power to be applied to a coil of the DC motor by PWM control or voltage control,
• the command is defined as a command for designating an ON/OFF ratio in the PWM control or a voltage applied to the coil, and
• the control section sequentially specifies a current position of the mechanism section based on a position detection signal outputted from the mechanism unit, and controls the contents of the command outputted in each timing until the mechanism section reaches a stop target position so that movement speed of the mechanism section is gradually slowed as the mechanism section approaches the stop target position.

A movement controller for moving a given mechanism section to a designated stop target position by a DC motor, comprising:

• a drive control means for driving the DC motor to move the given mechanism section in the direction of the stop target position;
• a deceleration control means for gradually decelerating rotational speed of the DC motor when the mechanism section in transit approaches the stop target position past a first distance;
• and
• a stop control means for completely stopping the mechanism section by braking rotation of the DC motor when the mechanism section decelerated by the deceleration control means approaches the stop target position past a second distance.

A camera apparatus for moving a lens in an imaging section to a designated stop target position by a DC motor, comprising:

• a drive control means f or driving the DC motor to move the lens in the direction of the stop target position;
• a deceleration control means for gradually decelerating rotational speed of the DC motor when the lens in transit approaches the stop target position past a first distance;
• and
• a stop control means for completely stopping the lens by braking rotation of the DC motor when the lens decelerated by the deceleration control means approaches the stop target position past a second distance.

A movement control method of moving a given mechanism section to a designated stop target position by a DC motor, the method comprising:

• a drive control step of driving the DC motor to move the given mechanism section in the direction of the stop target position;
• a deceleration control step of gradually decelerating rotational speed of the DC motor when the mechanism section in transit approaches the stop target position past a fast distance;
• and
• a stop control step of completely stopping the mechanism section by braking rotation of the DC motor when the decelerated mechanism section approaches the stop target position past a second distance.

A movement control program executed by a processor for moving a given mechanism section to a designated stop target position by a DC motor, comprising:

• a drive control step of driving the DC motor to move the given mechanism section in the direction of the stop target position;
• a deceleration control step of gradually decelerating rotational speed of the DC motor when the mechanism section in transit approaches the stop target position past a first distance;
• and
• a stop control step of completely stopping the mechanism