Shrapnel for voice coil motor

Abstract

The invention discloses an elastic sheet for a voice coil motor. The elastic sheet comprises a first elastic sheet and a second elastic sheet, the first elastic sheet comprises a first outer frame, a first inner frame and first elastic wires, the second elastic sheet comprises a second outer frame, a second inner frame and second elastic wires, the first elastic wires and the second elastic wires respectively comprise at least six bent arc portions and two straight line portions, the straight line portions and the arc portions are tangent and coupled by means of straight lines and arc shapes, the first elastic wires are in arc transition connection with the first outer frame and the first inner frame, the second elastic wires are in arc transition connection with the second outer frame and the second inner frame, and four groups of the first elastic wires and four groups of the second elastic wires are symmetrically distributed between the outer frames and the inner frames. When the elastic sheet is applied to the voice coil motor, during the operating process of the motor, an average value of an angle formed by dynamic and static axes of a rotor coil holder can be controlled within 0.12 degree, and a lens is fixed on the rotor coil holder so that an angle formed by dynamic and static optical axes of the lens can be minimized during the focusing process of the lens.

Description

technical field [0001] The invention relates to the technical field of voice coil motors, in particular to a shrapnel used for automatic focusing of a camera with a voice coil motor. Background technique [0002] Since the Voice Coil Motor (Voice Coil Motor, VCM) has the advantages of simple structure, small size, low energy consumption, no noise, high acceleration, fast response, accurate displacement and low price, the voice coil is currently the most important choice for the automatic focusing device of the camera. Motor structure automatic focusing is still the most cost-effective way. By fixing the optical lens on the rotor frame of the voice coil motor, the rotor acts as the power unit for moving the lens, and connects the rotor frame of the voice coil motor with the stator through the shrapnel pair. When the motor is energized, the rotor frame will move along the optical axis of the lens. Make a linear motion to realize the automatic focusing function, and the role o...

AI Technical Summary

Problems solved by technology

[0005] However, because the elastic wire described in this patent adopts a simple circuitous structure, the elastic wire structure can only produce a small centripetal tension during the motor movement, so that the angle formed by the rotor axis between dynamic and static conditions is relatively large , generally at an offset angle of more than 13 points (that is, more than 0.21°), which further affects the focusing effect, resulting in poor photo quality for high-pixel mobile phones

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