Actuator driving apparatus and camera module including the same
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsJe Hyun Bang, Byung Gi An, Hoon Heo, Shin Young Cheong, Dae Hyun Jeong
Life of this patent
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Abstract
An actuator and a camera module including the same are provided. The actuator driving apparatus includes a detector configured to apply a reference signal to a driving coil of an actuator and detect a coil current flowing in the driving coil, a calculator configured to determine a position of a lens carrier based on the coil current, and a driver configured to drive the actuator based on the position of the lens carrier and a position control signal.
Claims15
An actuator driving apparatus, comprising:
- a detector configured to apply a reference signal to a driving coil of an actuator and detect a coil current flowing through the driving coil;
- a calculator configured to determine a position of a lens carrier based on the coil current;
- and
- a driver configured to drive the actuator by applying a control signal to the driving coil to generate a driving force based on the position of the lens carrier and a target position of the lens carrier,
- wherein the detector is configured to detect the coil current from which an offset current of the control signal for driving the actuator is removed,
- wherein the offset current is based on the control signal, and wherein the control signal is transferred from the driver to the detector bypassing the driving coil.
A camera module comprising:
- a lens carrier disposed in a housing;
- a magnetic body that moves with the lens carrier;
- an actuator comprising a driving coil disposed in the housing to face the magnetic body, the actuator being configured to receive a control signal to move the lens carrier;
- and
- an actuator driving apparatus configured to drive the actuator,
- wherein the actuator driving apparatus comprises a detector that applies a reference signal to the driving coil and detects a coil current flowing through the driving coil, a calculator that determines a position of the lens carrier based on the coil current, and a driver that drives the actuator by applying a control signal to the driving coil to generate a driving force based on the position of the lens carrier and a target position of the lens carrier, wherein the detector detects the coil current from which an offset current of the control signal for driving the actuator is removed,
- wherein the offset current is based on the control signal, and wherein the control signal is transferred from the driver to the detector bypassing the driving coil.
An actuator driving apparatus comprising:
- a detection circuit configured to apply a reference to a driving coil of an actuator and detect a coil current flowing through the driving coil;
- and
- a driver configured to drive the actuator by outputting an actuator control signal to generate a driving force based on a position of a lens carrier as determined based on the coil current,
- wherein the detection circuit is further configured to receive the actuator control signal from the driver bypassing the driving coil.
Dependencies are inferred from the claim text.