Stepping motor driving device, lens driving device, and camera
AssigneeCanon Kabushiki Kaisha
InventorKousuke Kiyamura
Life of this patent
Estimating the term…
Abstract
A stepping motor driving device which makes it possible to reduce electric power consumed by a stepping motor and at the same time suppress degradation of shake correcting performance. A CPU of the stepping motor driving device switches between a first driving method in which a first applied voltage is applied to the stepping motor and a second driving method in which each pulse is divided to apply the first applied voltage over a predetermined time period and then apply a second applied voltage to the stepping motor, depending on the state of the drive frequency of the stepping motor.
Claims4
A stepping motor driving device comprising:
- a stepping motor;
- and
- a control unit configured to switch between a first driving method in which a first applied voltage is applied to said stepping motor, and a second driving method in which each pulse is divided to apply the first applied voltage over a predetermined time period, and then apply a second applied voltage to said stepping motor, depending on a state of a drive frequency of said stepping motor.
A lens driving device comprising:
- a lens which is movably supported;
- a stepping motor configured to drive said lens in a direction orthogonal to an optical axis;
- and
- a control unit configured to switch between a first driving method in which a first applied voltage is applied to said stepping motor, and a second driving method in which each pulse is divided to apply the first applied voltage over a predetermined time period, and then apply a second applied voltage to said stepping motor, depending on a state of a drive frequency of said stepping motor.
A camera comprising:
- a release switch;
- a lens which is movably supported;
- a stepping motor configured to drive said lens in a direction orthogonal to an optical axis;
- and
- a control unit configured to switch between a first driving method in which a first applied voltage is applied to said stepping motor, and a second driving method in which each pulse is divided to apply the first applied voltage over a predetermined time period, and then apply a second applied voltage to said stepping motor, depending on a state of said release switch.
A camera comprising:
- a switch having a function of switching between moving image shooting and still image shooting;
- a lens which is movably supported;
- a stepping motor configured to drive said lens in a direction orthogonal to an optical axis;
- and
- a control unit configured to switch between a first driving method in which a first applied voltage is applied to said stepping motor, and a second driving method in which each pulse is divided to apply the first applied voltage over a predetermined time period, and then apply a second applied voltage to said stepping motor, depending on a state of said switch.
Dependencies are inferred from the claim text.