Piezoelectric Camera Motor With Asymmetrical Push Structure
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Solution Overview
Problem
Conventional camera module motors, primarily using magnetic drives, are prone to electromagnetic interference, which degrades photographing quality due to sensitivity to surrounding magnetic materials or fields.
Innovation Solution
A piezoelectric motor utilizing a vibration exciter and resonator with an asymmetrical push portion, driven by piezoelectric technology, which generates elastic vibrations to move the driven member, minimizing magnetic interference and enhancing photographing quality by using piezoelectric drive instead of magnetic drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a moving coil motor is used to drive the lens, then the motor can provide electromagnetic force to push the lens to move, but magnetic interference occurs due to sensitivity to surrounding magnetic materials or fields, degrading photographing quality
Solution Approach 1:
The patent replaces the electromagnetic drive system with a piezoelectric drive system. The piezoelectric motor uses piezoelectric elements to generate mechanical vibrations directly, eliminating the need for magnetic fields and coils. This substitution of the driving mechanism resolves the magnetic interference problem while maintaining the ability to drive the lens for focusing and zooming operations
Solution Approach 2:
The patent changes the fundamental operating parameter of the motor from electromagnetic field-based actuation to piezoelectric vibration-based actuation. By changing the driving principle from continuous electromagnetic force to periodic mechanical vibration at resonance frequency, the system eliminates magnetic interference while achieving the required lens movement through vibrational propulsion
2Object-affected harmful factors
If a piezoelectric motor is used to eliminate magnetic interference, then photographing quality is improved, but the device structure becomes more complex compared to conventional moving coil motors
Solution Approach 1:
The patent merges the drive mechanism and the lens barrel into an integrated assembly. The piezoelectric elements are mounted directly on the lens barrel, and the vibration exciter is combined with the resonator structure. This merging reduces the number of separate components and simplifies the overall device structure despite using piezoelectric technology
Solution Approach 2:
The piezoelectric motor structure is designed to serve multiple functions: the vibration exciter generates vibrations, the resonator amplifies and transmits them, and the push portion drives the lens. This multi-functional design reduces the need for separate components for each function, thereby reducing overall structural complexity
3Volume of moving object
If the push portion is made asymmetrical to achieve diversified structural forms and better space utilization, then the camera module space is optimized, but the manufacturing precision requirements increase
Solution Approach 1:
The patent deliberately designs the push portion with an asymmetrical structure relative to the first central axis. This asymmetry enables the push portion to push the driven member in a specific directional manner, achieving better space utilization within the camera module. The asymmetrical design allows for more flexible structural configuration and optimized space arrangement
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 piezoelectric motor effectively reduces electromagnetic interference, improving the photographing quality of camera modules by providing a stable and interference-resistant drive mechanism, capable of directional translation motion with a simple and manufacturable structure.
Implementation Method 1
The vibration exciter deforms based on an applied electrical signal. When the electrical signal is an alternating signal, the piezoelectric material periodically shrinks.
Implementation Method 2
amplify the vibration to the resonator through resonance, so that a part of the resonator that come into contact with the driven member forms an elliptical track motion
Implementation Method 3
relative friction occurs between the resonator and the driven member, to implement a driving function of the piezoelectric motor
Data Source
AI summary
An electronic device may include a camera module which may include a piezoelectric motor. The piezoelectric motor includes a vibration exciter and a resonator. The resonator includes a main body portion and a push portion, the main body portion includes a first central axis, the main body portion is distributed on two sides of the first central axis, and the vibration exciter is fastened to the main body portion. The push portion is connected to the main body portion and distributed on the two sides of the first central axis, the push portion is of an asymmetrical structure with respect to the first central axis, and the push portion is configured to push, when excited by the vibration exciter, a driven member to move.