An optical anti-vibration voice coil motor capable of changing the center of the shift axis and its assembly method

Abstract

The invention provides an optical anti-vibration voice coil motor capable of changing tilt shift centre, comprising a substrate, at least one elastic sheet, a lens carrier, at least three magnetic body groups and a shell. The pedestal, the shell and the magnetic body groups are connected together to form a fixed structure. The magnetic body groups are arranged in the shell; the lens carrier comprises a main body and coils arranged on the main body. The number of the coils is the same as that of the magnetic body groups. The coils and the magnetic body groups are arranged oppositely one by one. The elastic sheet is connected with the lens carrier and the magnetic body groups to form a multi-variant spring oscillator system with a spring centre. The elastic sheet is electrically connected with the coils. The direction of the electromagnetic resultant force of each coil is not faced to and not back to the spring centre, and is not parallel to an optical axis. By adjusting the size of each resultant force, the motor could be used for controlling the tilt shift of the lens to be tilted and be moved along the optical axis to achieve an optical anti-vibration function and an automatic focusing function. By adopting the above structure, the optical anti-vibration voice coil motor not only is simple in structure, and high in reliability, and reduces production cost, but also could maintain excellent image resolution and resist magnetic disturbance.

Description

technical field [0001] The invention belongs to the technical field of optical anti-shake devices, and in particular relates to an optical anti-shake voice coil motor capable of changing the shift center and an assembly method thereof. Background technique [0002] Today's miniature optical image stabilization voice coil motor technology has been widely used in high-end mobile phones, which can effectively reduce the chance of blurry photos taken in low-light environments, and reduce the disturbing shake in videos. However, compared with general auto-focus motors, anti-shake voice coil motors are more complex in design, lower in production yield and efficiency, and higher in cost. Therefore, described technology has not yet been popularized to mid-end and low-end mobile phones, and most mobile phone users still fail to enjoy the benefits brought by this technology. [0003] Miniature optical image stabilization voice coil motors can be divided into three categories: camera ...

AI Technical Summary

Problems solved by technology

However, this will lead to two problems: first, the center of the shifting axis will still be very close to the optical center, so that the optical anti-shake effect still needs to be improved; second, the distance between the center of the spring and the center of gravity of the moving structure There is a certain distance between them. When the lens faces the horizontal direction, the gravity acting on the moving structure (including the lens) will cause the center of the spring to shift and tilt, resulting in a decrease in the resolution of the edge of the image.

Therefore, this type of voice coil motor needs to use additional control methods to compensate for the tilt caused by gravity, thus increasing the complexity and cost of the control system

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