US 8,009,971 B2 · Hand-shake correction method and apparatus of camera module for use in mobile device

Abstract

A hand-shake correction apparatus and method for a camera module for typical use in a mobile device. A camera unit includes an angular velocity sensor for sensing an angular velocity of a hand-shake motion of a camera, a position detection sensor for detecting a current position of an image sensor, and an actuator for actuating the image sensor. An Optical Image Stabilizer (OIS) circuit unit controls the actuator using a multi-rate Proportional Integrate Derivative (PID) control scheme that performs control a plurality of times using a shorter control period compared with existing PID controls for a basic period, in which a reference value is updated according to a control reference value by which the image sensor optimally shifts to correct a hand-shake motion.

Claims16

Dependent claims

A hand-shake correction apparatus of a camera module for use in a mobile device, the apparatus comprising:

a camera unit including an angular velocity sensor for sensing an angular velocity of a hand-shake motion of a camera,
a position detection sensor for detecting a position of an image sensor, and
an actuator for actuating the image sensor;
and
an Optical Image Stabilizer (OIS) circuit unit for controlling the actuator using a multi-rate Proportional Integrate Derivative (PID) control scheme that performs control for a plurality of times over a basic period in which a reference value is updated according to a control reference value by which the image sensor optimally shifts to correct a hand-shake motion, the control scheme comprising a time-division scheme wherein different functions are performed in each subdivision of the time-division scheme.

2 more elements

A hand-shake correction method of a camera module for use in a mobile device, the method comprising:

(a) detecting an angular velocity of a hand-shake motion that has occurred in a camera, and detecting a position of an image sensor of the camera;
(b) generating an angular velocity signal and an image sensor signal, respectively, in accordance with step (a)
(c) processing the detected angular velocity signal and image sensor position signal generated in step (b);
(d) calculating a hand-shake by integrating the angular velocity signal;
and
(e) controlling the image sensor using a multi-rate Proportional Integrate Derivative (PID) control scheme that performs control for a plurality of times in a time-division scheme over a basic period in which a reference value is updated according to a control reference value by which the image sensor optimally shifts in order to compensate for a hand-shake motion, based on the calculated hand-shake and the processed image sensor position signal,
wherein a different function is performed in each of the plurality of times.

4 more elements

Dependencies are inferred from the claim text.

Hand-shake correction method and apparatus of camera module for use in mobile device

Life of this patent

Hand-shake correction method and apparatus of camera module for use in mobile device

Life of this patent

Abstract

Claims16