Optical Element Drive Mechanism With Rotary SMA Actuation
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Solution Overview
Problem
Conventional optical element driving mechanisms increase the thickness of electronic devices and are susceptible to magnetic interference, hindering device miniaturization and functionality.
Innovation Solution
An optical element driving mechanism with a fixed portion, first and second movable portions, and a driving assembly that allows for multi-dimensional movements, including linear and rotational motions, using shape memory alloys for actuation, to control light entry while minimizing device thickness and magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional optical element driving mechanism is provided, then the optical element can be controlled, but the thickness of the electronic device increases
Solution Approach 1:
The patent transitions from conventional linear driving mechanisms to a rotary driving mechanism that operates in a different dimensional space. The rotary drive module rotates a drive shaft to convert rotational motion into linear motion of the optical element, thereby reducing the thickness direction dimension while maintaining driving functionality.
Solution Approach 2:
The patent replaces conventional magnetic driving mechanisms with a rotary mechanical driving system. By using a rotary drive module with a drive shaft and transmission structures, the system eliminates magnetic components that increase thickness, achieving a more compact design while maintaining reliable optical element control.
2Reliability
If a conventional optical element driving mechanism is used, then the optical element can be actuated, but it is susceptible to magnetic interference
Solution Approach 1:
The patent replaces magnetic actuation mechanisms with a purely mechanical rotary driving system. The rotary drive module uses a drive shaft, transmission gears, and linkage structures to actuate the optical element, eliminating magnetic fields and their associated interference issues while providing reliable and stable operation.
Solution Approach 2:
The patent extracts and removes magnetic components from the driving mechanism. By eliminating magnets and electromagnetic actuators, the system avoids magnetic interference entirely while maintaining the necessary actuation functionality through alternative mechanical means.
3Length of moving object
If the optical element driving mechanism is made compact, then device thickness is reduced, but magnetic interference susceptibility increases
Solution Approach 1:
The patent simultaneously achieves compactness and magnetic interference immunity by replacing magnetic actuators with a rotary mechanical driving system. The rotary drive module's mechanical components occupy less space in the thickness direction while inherently providing immunity to magnetic interference through their non-magnetic design.
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 mechanism achieves a more compact design and reduces susceptibility to magnetic interference, enabling effective light control in electronic devices.
Implementation Method 1
using shape memory alloys for actuation
Data Source
AI summary
An optical element driving mechanism, which drives an optical element, includes a fixed portion, a first movable portion, and a driving assembly. The first movable portion is moved relative to the fixed portion, and the driving assembly drives the first movable portion to move relative to the fixed portion. The first movable portion is moved in a first dimension relative to the fixed portion, and the first movable portion drives the optical element to move.