SMA Motor Camera Module for Fast Focusing and Vibration Control
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Solution Overview
Problem
Traditional camera modules face challenges with increasing pixel density, as voice coil motors become larger and slower, causing noise and image blur due to lens shaking, which hinders the development of lightweight and thin electronic devices with improved imaging performance.
Innovation Solution
A camera module incorporating a shape memory alloy (SMA) motor for rapid focusing and vibration compensation, combined with an adjustable lens module using voltage-controlled lenses, ensures quick focusing and stable image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a voice coil motor is added to the lens module to achieve focusing function, then the focusing capability is improved, but the motor size becomes larger and the device becomes heavier
Solution Approach 1:
The patent replaces the traditional voice coil motor with a piezoelectric motor that utilizes piezoelectric effects (electromechanical coupling) to drive lens focusing. This substitution achieves faster focusing speed while reducing motor size and weight, directly resolving the contradiction between focusing performance and device compactness
Solution Approach 2:
The patent changes the operating parameters and working mechanism from electromagnetic induction (voice coil) to piezoelectric deformation (piezoelectric motor). This parameter change enables the motor to achieve higher speed and lower weight simultaneously, solving the technical contradiction
2Speed
If a voice coil motor is used for focusing, then the focusing function is achieved, but the focusing speed becomes slow
Solution Approach 1:
The patent substitutes the slow voice coil motor with a piezoelectric motor that responds almost instantaneously to voltage changes. The piezoelectric effect enables rapid deformation and movement, dramatically reducing focusing time and increasing focusing speed
3Speed
If a voice coil motor is used for focusing, then the lens can move to achieve focus, but abnormal noise and lens shaking occur causing image blur
Solution Approach 1:
The patent replaces the noisy voice coil motor with a piezoelectric motor that operates silently through crystal deformation rather than electromagnetic coil movement. This eliminates abnormal noise and reduces vibration, preventing image blur while maintaining fast focusing capability
Solution Approach 2:
The patent changes the driving mechanism from electromagnetic force (which causes coil vibration and noise) to piezoelectric strain (which operates silently). This parameter change eliminates the harmful noise and vibration effects while preserving the focusing function
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 SMA motor and voltage-controlled lens system enable rapid focusing and vibration compensation, enhancing imaging quality and addressing the limitations of traditional voice coil motors, while maintaining a compact and lightweight design.
Implementation Method 1
A camera module incorporating a shape memory alloy (SMA) motor for rapid focusing and vibration compensation
Implementation Method 2
an adjustable lens module using voltage-controlled lenses, ensures quick focusing and stable image capture
Data Source
AI summary
A camera module includes a circuit board; and a lens module electrically connected with the circuit board. The lens module is configured to be capable of deformed when being applied a voltage thereon so as to change a focus length of the lens module.