Image stabilization control circuit

Abstract

In the vibration compensation control circuit of a camera device, the detected angular velocity signals corresponding to the vibration are integrated to acquire the required displacement of a lens. In the processing, the output signal of a gyro sensor is impacted by phrase delay generated in a high frequency area; therefore, the high-frequency area generates surplus phrase delay, a correct integral signal is hard to acquire and the vibration compensation accuracy is low. The invention provides a vibration compensation control circuit. A gyro equalizer (24) integrates the angular velocity signals from the gyro sensor (12) by an integral circuit (46) and converts the angular velocity signals into angle signals, and then a centering processing circuit (48) (HPF) removes the direct current components of the angle signals. A low boost filter (LBF) is adopted to form the integral circuit (46) to take the phrase delay of a target compensation frequency band as the value corresponding to the integral processing. Furthermore, by means of the property of reducing phrase delay, the LBF compensates the surplus phrase delay of the angle signals in the high-frequency area caused by the phrase property of the gyro sensor (12) on the high frequency side and leads the phrase delay in the high frequency area to be close to 90 degrees.

Description

technical field [0001] The present invention relates to a vibration compensation control circuit for driving a vibration compensation mechanism provided for compensating vibration such as hand shake in an imaging device such as a digital still camera. Background technique [0002] An anti-shake function for suppressing deterioration of image quality due to hand-shake is installed in many imaging devices in recent years. There are many methods of hand shake compensation, among which there is a method in which the vibration detection element detects the vibration of the imaging device, and based on the detection signal, the optical components such as the correction lens and the CCD image sensor are adjusted by the actuator. The imaging element is displaced. The vibration detection element adopts a gyro sensor to detect an angular velocity corresponding to a change in the direction of the optical axis. On the other hand, for the drive control of the actuator, the displacement...

AI Technical Summary

Problems solved by technology

In particular, the compensation frequency band B for the purpose of assuming the existence of a vibration component in order to compensate CMP In the case where the frequency region where the phase delay of the gyro sensor occurs is involved, the influence may become greater

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