An optical image stabilization device and its control system based on piezoelectric stack

Abstract

The invention discloses an optical image stabilization device based on piezoelectric stacking, comprising a lens mounting bracket, the lens mounting bracket is located in the displacement amplifying direction of a first displacement amplifying module, and is connected to the first displacement amplifying module through a connecting block. In the first rectangular frame; the first rectangular frame is located in the displacement amplifying direction of the second displacement amplifying module, and the second displacement amplifying module is connected by a connecting block, and the whole is arranged in the second rectangular frame; the first and second displacement amplifying modules The modules are arranged in parallel, and the two extend under the action of the applied voltage, respectively producing positive and negative displacement outputs acting on the lens mount. The displacement amplifying module of the present invention decouples the displacement in the forward and reverse directions, so that the piezoelectric stack does not need a pre-voltage to maintain a certain pre-displacement in the initial stage. A closed-loop control system is also designed in the present invention, the displacement index is tested by the built-in displacement sensor of the image stabilization device, and the central processing unit module calculates and performs high-precision displacement control.

Description

technical field [0001] The patent of the present invention belongs to the field of precision optical instruments, and in particular relates to an optical image stabilization device based on a piezoelectric stack and its control system. Background technique [0002] Since the imaging carrier is affected by attitude changes and vibrations, it will result in unclear images and affect the effectiveness of image information. Image stabilization technology can reduce or eliminate the influence of moving camera carrier on the image plane, and improve the effectiveness of the obtained image information. [0003] The current image stabilization technology can be classified into three types according to the principle: mechanical image stabilization, electronic image stabilization and optical image stabilization. Mechanical image stabilization uses a stable platform composed of sensors such as gyroscopes and a servo system to compensate for the relative motion of the camera system on ...

AI Technical Summary

Problems solved by technology

In this invention, the output displacements of the two piezoelectric stacks in one direction will affect each other, and the output displacements of the piezoelectric stacks in the X and Y directions will also affect each other. The displacement magnification is low, and the two-dimensional image stabilization adjustment is an open-loop adjustment, with poor adjustment accuracy and slow response speed

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