Lens Driving Device Shape Memory Alloy Stability
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Solution Overview
Problem
Miniaturization of lens driving devices for portable electronic apparatuses leads to decreased stability and thrust, compromising image quality due to insufficient balance and hysteresis in existing shape memory alloy structures.
Innovation Solution
A lens driving device with a configuration that includes a fixing base, cover, lens holder, support frame, and shape memory alloy portion, where the shape memory alloy is enhanced with crimping lugs and a leaf spring support member to enable stable movement of the lens along the optical axis, with a slope angle of 20 to 40 degrees and staggered grooves for balanced force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens driving device is miniaturized, then the size of the device is reduced, but the thrust and stability of lens driving decrease
Solution Approach 1:
The patent changes the geometric parameters of the shape memory alloy structure, specifically setting the slope angle between 20-40 degrees and optimizing the thickness and width dimensions. This parameter optimization ensures that the miniaturized device maintains sufficient driving force and stability without requiring increased size
Solution Approach 2:
The patent uses shape memory alloy as a key material component in the support frame and support members. The shape memory alloy provides both structural support and actuating force, enabling the miniaturized device to maintain high stability and thrust in a compact form factor
2Manufacturing precision
If the lens size is increased, then the image quality is improved, but the lens driving device size must be increased
Solution Approach 1:
The patent optimizes the slope angle parameter of the shape memory alloy structure to be between 20-40 degrees, which maximizes the conversion efficiency of the shape memory effect to linear motion. This enables compact lens driving devices to provide sufficient thrust for larger lenses without increasing overall device size
Solution Approach 2:
The patent applies shape memory alloy portions strategically in critical locations within the lens driving device, such as the support frame and support members. This localized use of advanced materials provides enhanced performance in key areas without requiring overall device enlargement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves improved balance and stability of the lens driving mechanism, enhancing image quality by ensuring stable movement and reducing instability, thereby improving the overall performance of the lens driving device.
Implementation Method 1
The shape memory alloy portion comprises at least one shape memory alloy and crimping lugs, and the shape memory alloy portion is provided on the fixing base and the support frame to cause the lens holder to move freely in the optical axis direction
Data Source
AI summary
The present disclosure provides a small and well-focused lens driving device, a camera including the lens driving device, and a portable electronic apparatus. The lens driving device includes a fixing base, a cover, a lens holder, a support frame, a support member, and a shape memory alloy portion. In the lens driving device, a receiving space is defined by the fixing base and the cover. The lens holder configured to receive a lens, as well as the support frame, the support member, and the shape memory alloy portion that cause the lens holder to move freely in an optical axis direction are provided in the receiving space. The shape memory alloy portion has a shape memory alloy and a crimping lug, and the shape memory alloy portion is provided on the fixing base and the support frame to cause the lens holder to move freely in the optical axis direction.