Image stabilization control circuit
First Claim
1. A image stabilization control circuit in which a vibration detection signal corresponding to the movement speed of an image capturing device is obtained from a vibration detector provided to the image capturing device, and which drives a vibration compensation mechanism of the image capturing device, the image stabilization control circuit comprising:
- a vibration-compensating signal generator circuit for performing an integration process on the vibration detection signal and generating a vibration-compensating signal corresponding to the displacement magnitude of the image capturing device; and
a servo-circuit for generating, on the basis of the vibration-compensating signal, a drive signal for driving the vibration-compensating mechanism;
wherein the vibration-compensating signal generator circuit has;
a high pass filter for damping a low-frequency component from the vibration detection signal, and transmitting a vibration component of the target compensation region; and
an integration circuit for performing the integration process on the vibration detection signal transmitted by the high pass filter; and
wherein the integration circuit uses a phase delay compensation circuit for compensating a phase delay in the target compensation region, achieves a counterbalance between a reduced phase delay of the phase delay compensation circuit in a high-frequency region, and a phase delay of the vibration detection signal increased in the high-frequency region by the characteristics of the vibration detector, and adjusts the phase characteristics in the target compensation region and the high-frequency region.
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Accused Products
Abstract
A image stabilization control circuit for an image capturing device, wherein a gyro-equalizer (24) integrates an angular velocity signal from a gyro-sensor (12) in an integration circuit (46). The integration circuit (46) is composed of a low-boost filter (LBF), and a phase delay in a target compensation region is set to a value appropriate for an integration process. Furthermore, a characteristic whereby the LBF reduces the phase delay at higher frequencies is used, compensation is applied to the excess phase delay of the angular signal in the high-frequency region brought about by the effect of the phase delay generated in the high-frequency region by the output signal of the gyro-sensor (12), and the phase delay in the high-frequency region is brought nearer to 90 degrees. This allows the accuracy of the process for determining the required displacement magnitude of a lens to be increased.
7 Citations
6 Claims
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1. A image stabilization control circuit in which a vibration detection signal corresponding to the movement speed of an image capturing device is obtained from a vibration detector provided to the image capturing device, and which drives a vibration compensation mechanism of the image capturing device, the image stabilization control circuit comprising:
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a vibration-compensating signal generator circuit for performing an integration process on the vibration detection signal and generating a vibration-compensating signal corresponding to the displacement magnitude of the image capturing device; and a servo-circuit for generating, on the basis of the vibration-compensating signal, a drive signal for driving the vibration-compensating mechanism; wherein the vibration-compensating signal generator circuit has; a high pass filter for damping a low-frequency component from the vibration detection signal, and transmitting a vibration component of the target compensation region; and an integration circuit for performing the integration process on the vibration detection signal transmitted by the high pass filter; and wherein the integration circuit uses a phase delay compensation circuit for compensating a phase delay in the target compensation region, achieves a counterbalance between a reduced phase delay of the phase delay compensation circuit in a high-frequency region, and a phase delay of the vibration detection signal increased in the high-frequency region by the characteristics of the vibration detector, and adjusts the phase characteristics in the target compensation region and the high-frequency region. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification