Camera module with MEMS actuator and method for driving the same
AssigneeLG Innotek Co., Ltd.
InventorJunghyun Lee
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Abstract
Disclosed herein is a camera module having a MEMS actuator and a driving method thereof, the camera module with a MEMS actuator, including, a MEMS actuator moving a lens with electrostatic force, for focus adjustment, an electrostatic capacity measurement unit measuring electrostatic capacity produced in the MEMS actuator, a foreign substance determination unit determining if foreign substances exist in the MEMS actuator, and outputting a trigger signal when a foreign substance exists, and a MEMS actuator drive unit driving the MEMS actuator to a reiterated vibration using the trigger signal outputted from the foreign substance determination unit.
Claims11
A camera module with a MEMS (Micro Electro Mechanical Systems) actuator, comprising:
- a MEMS actuator moving a lens with electrostatic force, for focus adjustment;
- an electrostatic capacity measurement unit measuring electrostatic capacity produced in the MEMS actuator;
- a foreign substance determination unit determining if foreign substances exist in the MEMS actuator, and outputting a trigger signal when a foreign substance exists;
- and
- a MEMS actuator drive unit driving the MEMS actuator to a reiterated vibration using the trigger signal outputted from the foreign substance determination unit.
A method for driving a camera module with a MEMS actuator, comprising:
- measuring electrostatic capacity produced when adjusting a focus of a lens with an electrostatic force in a MEMS actuator;
- determining if electrostatic capacity generated in the MEMS actuator has a hysteresis error;
- and
- driving the MEMS actuator to a reiterated vibration in a case where the electrostatic capacity has the hysteresis error, and removing foreign substances existing inside the MEMS actuator.
Dependencies are inferred from the claim text.