Dual-drive two-pole automatic focusing device

Abstract

The invention discloses a dual-drive two-pole automatic focusing device, which comprises a base, a lens support body, a rear spring plate, a front spring plate, a shell, drive coil groups, drive magnets and drive magnet fixing plates, wherein the drive magnet fixing plates and the shell are in embedded assembly; each drive coil group comprises two drive coils; and two drive coils are integrally wound and molded. The dual-drive two-pole automatic focusing device has the beneficial effects that (1) most main body structure is made of plastic, so that mutual interference with a magnetic field of an antenna is avoided; (2) two drive coils are continuously wound and molded and are symmetrically distributed; two drive coils are matched with two drive magnets to form two-pole dual dual-drive; and relatively large driving force is obtained by the two-pole dual dual-drive under the condition of the same volume, so that a relatively quick and effective focusing function is achieved; and (3) the drive magnets are fixed on the drive magnet fixing plates; the drive magnet fixing plates and the shell are in split embedded assembly; the positions of the drive magnets are conveniently corrected by the structure; and the requirements of customers for adjusting the attractive appearance or the functionality can be met.

Description

technical field [0001] The invention relates to an automatic focusing device, in particular to a dual-drive two-pole automatic focusing device, which is used in a miniature camera device on a mobile phone. Background technique [0002] The main structure of the autofocus device is a voice coil motor, which is a device that uses the interaction between the magnetic field from the permanent magnet steel and the magnetic field generated by the energized coil conductor to generate regular movement. It is widely used in mobile phone cameras middle. At present, all drive devices use iron shells as the stator frame to form a closed magnetic field; iron has better magnetic permeability, but since the autofocus device is generally assembled next to the antenna on the mobile phone, the antenna is also an electromagnetic component. When the antenna works at the same time When the magnetic field of the antenna reaches the strongest, due to the existence of the iron shell stator, the tw...

AI Technical Summary

Problems solved by technology

At present, all drive devices use iron shells as the stator frame to form a closed magnetic field; iron has better magnetic permeability, but since the autofocus device is generally assembled next to the antenna on the mobile phone, the antenna is also an electromagnetic component. When the antenna works at the same time When the magnetic field of the antenna reaches the strongest, due to the existence of the iron shell stator, the two magnetic fields interfere to a certain extent, which leads to the influence of the functions of the two electromagnetic fields, making the antenna appear when the received signal is converted into sound. Noise, intermittent signals, etc., as well as bad deviations in the focusing process of the camera, severely restrict the function of the two.

In addition, in the current autofocus device, the driving magnet is usually fixed on the inner wall of the iron shell, which requires high positioning and assembly technology, and it is not easy to make corrections and functional adjustments later.

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