Lens Driving Mechanism With Conductive Link for Compact Focus Actuation
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Solution Overview
Problem
The miniaturization of electronic devices has increased the difficulty of mechanical design, leading to low reliability and low driving force for moving lenses, particularly in devices with coils and magnets for adjusting focus.
Innovation Solution
A driving mechanism incorporating a fixed part, movable part, driving assembly, circuit board, and conductive element, where the conductive element is connected to the driving assembly and circuit board, allowing for improved miniaturization and reduced magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If coils and magnets are used for adjusting focus, then focus adjustment functionality is achieved, but driving force becomes insufficient and reliability decreases due to miniaturization
Solution Approach 1:
The patent replaces the traditional electromagnetic driving system (coils and magnets) with a piezoelectric driving system. The piezoelectric element converts electrical signals directly into mechanical displacement through the piezoelectric effect, eliminating the need for coils and magnets. This substitution provides stronger driving force and higher reliability in miniaturized devices, as the piezoelectric element can generate precise linear motion without the complexity of electromagnetic interactions.
Solution Approach 2:
The patent changes the driving mechanism from electromagnetic actuation to piezoelectric actuation, fundamentally altering the physical parameter conversion pathway. Instead of converting electrical energy to magnetic field and then to mechanical motion, the system directly converts electrical energy to mechanical displacement through piezoelectric strain, improving efficiency and reliability in compact designs.
2Volume of moving object
If electronic devices are miniaturized, then device size is reduced, but mechanical design difficulty increases and driving force decreases
Solution Approach 1:
The patent replaces complex electromagnetic mechanical systems with a compact piezoelectric actuator that directly generates linear motion. This substitution simplifies the mechanical design by eliminating the need for coils, magnets, and associated mounting structures, while providing sufficient driving force in a miniaturized package.
Solution Approach 2:
The patent integrates the piezoelectric element directly into the lens barrel structure, segmenting the driving function from the traditional electromagnetic assembly. This integration reduces the number of separate components and simplifies the overall mechanical design, making miniaturization more achievable.
3Reliability
If coils and magnets are used for focus adjustment, then focus control is achieved, but thermal demagnetization occurs reducing reliability
Solution Approach 1:
The patent eliminates magnets from the system by replacing the electromagnetic driving mechanism with a piezoelectric actuator. Since piezoelectric elements do not rely on magnetic fields, they are immune to thermal demagnetization effects. The piezoelectric material maintains its piezoelectric properties across a wider temperature range, significantly improving reliability in thermally challenging environments.
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 enhances the reliability and driving force of lens movement while maintaining a compact design, reducing thermal demagnetization and improving assembly flexibility.
Implementation Method 1
a driving assembly, a circuit board, and conductive element. The driving assembly is used for driving the movable part to move relative to the fixed part
Data Source
AI summary
A driving mechanism is provided, including a fixed part, a movable part for holding an optical element, a driving assembly, a circuit board, and conductive element. The driving assembly is used for driving the movable part to move relative to the fixed part. The circuit board is disposed on the fixed part, having a conductive portion exposed to an outer surface of the circuit board. The conductive element forms a longitudinal end portion not parallel to the outer surface of the circuit board, wherein the conductive element is electrically connected to the driving assembly and the conductive portion of the circuit board.