Lens automatic focusing driving device

Abstract

The invention relates to a lens automatic focusing driving device, which at least comprises a fixed ring, a plurality of limiting elements, a lens barrel, an actuator and a plurality of groups of balls, wherein the fixing ring is arranged on the upper surface of a base; the plurality of limiting elements are respectively and vertically arranged on the fixing ring; the lens barrel is arranged on the base and located between the limiting elements, one outer side surface of the lens barrel is provided with a plurality of convex parts and concave parts, and one concave part and the corresponding limiting element form an arrangement space; the actuator is arranged on the upper surface of the base and is provided with two groups of electrode terminal pairs and two groups of shape memory alloy wires which are oppositely arranged, the middle section of each shape memory alloy wire is in contact with the corresponding convex part of the lens barrel, and the two ends of each shape memory alloy wire are respectively connected with the electrodes of each group of electrode terminal pairs; and the plurality of groups of balls are positioned in the corresponding arrangement spaces and are in contact with the surfaces of the limiting elements and the concave parts respectively. According to the lens automatic focusing driving device, the lens barrel can move relative to the base along the optical axis, the inclination angle of the lens barrel during movement can be limited, and the automatic focusing function of the lens can be accurately controlled.

Description

technical field [0001] The invention relates to a lens focusing drive device, in particular to a lens auto focus drive device using shape-memoryalloy (SMA) wires. Background technique [0002] The Auto Focus (Auto Focus) actuator of the mobile phone camera module is one of the indispensable standard equipments of current smart phones, and it needs to move the lens module to achieve the auto focus function when shooting. [0003] There are also many different technologies for AF actuator design, such as voice coil motor (VCM), piezoelectric motor (piezoelectric motor), shape memory alloy wire. At present, the voice coil motor is the most widely used, and its advantages are low cost, high production pass rate, and mature technology. However, voice coil motors still have some disadvantages, such as slow focusing speed, high power consumption, and being affected by magnetic force, so many new technologies are still being proposed and discussed. Compared with voice coil motors,...

AI Technical Summary

Problems solved by technology

[0005] However, in the process of moving the lens module, the control of it

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