Dual Piezoelectric Camera Module for Zoom and Autofocus Travel
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Solution Overview
Problem
The voice coil motor in camera modules struggles to provide sufficient driving force for long lens travel distances, especially with the introduction of continuous optical zoom functions, making it difficult to meet the demands of both autofocus and optical zoom requirements.
Innovation Solution
A camera module design incorporating two piezoelectric motors to drive separate lens assemblies, one for autofocus and one for optical zoom, utilizing a guide member to ensure consistent movement trajectories and employing friction members to reduce wear and enhance the driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a voice coil motor is used to drive lens travel, then the structure is simple and easy to manufacture, but the driving force is weak and cannot meet the demand for long lens travel distances
Solution Approach 1:
The patent replaces the electromagnetic voice coil motor with a piezoelectric motor that uses piezoelectric ceramic elements to generate mechanical motion through piezoelectric expansion and contraction. This substitution provides significantly stronger driving force while maintaining a relatively compact structure, resolving the contradiction between driving force and structural complexity.
Solution Approach 2:
The patent changes the fundamental operating parameters of the motor system by using piezoelectric materials with high coupling coefficients, enabling the motor to generate much higher forces compared to voice coil motors operating at similar voltages and sizes.
2Length of moving object
If the lens travel distance is extended for optical zoom, then the zoom capability is improved, but the voice coil motor cannot provide sufficient driving force
Solution Approach 1:
The piezoelectric motor replaces the insufficient voice coil motor, providing the necessary driving force to move the lens assembly over extended distances required for optical zoom functionality while maintaining adequate force throughout the entire travel range.
Solution Approach 2:
The patent employs a dynamic pressing assembly that adjusts the pressing force applied to the piezoelectric motor during operation, optimizing the driving force distribution across different positions of the lens travel to ensure sufficient force is available throughout the extended zoom range.
3Reliability
If friction members are added to reduce wear, then the durability is improved, but the device complexity increases
Solution Approach 1:
The patent introduces friction members as intermediary elements between the piezoelectric motor and the lens assembly, specifically at the pressing assembly contact points. These friction members reduce wear on critical components by providing a wear-resistant interface, thereby improving durability while adding minimal structural complexity.
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 design enables both continuous optical zoom and autofocus functions by leveraging the strong driving force and speed of piezoelectric motors, ensuring long travel distances and reducing wear through friction members, thus enhancing the camera module's performance.
Implementation Method 1
a first piezoelectric motor and a second piezoelectric motor provided within the accommodating cavity... the first piezoelectric motor is configured to drive the first lens assembly to move... and the second piezoelectric motor is configured to drive the second lens assembly to move
Implementation Method 2
employing friction members to reduce wear and enhance the driving force
Data Source
AI summary
The present application provides a camera module and an electronic device. The camera module includes a housing having an accommodating cavity, a first piezoelectric motor and a second piezoelectric motor provided within the accommodating cavity, a first lens assembly connected to the first piezoelectric motor and provided within the accommodating cavity, a second lens assembly connected to the second piezoelectric motor and provided within the accommodating cavity, and a guide member fixed to the housing and provided within the accommodating cavity. The first piezoelectric motor is configured to drive the first lens assembly to move along a lengthwise direction of the guide member, and the second piezoelectric motor is configured to drive the second lens assembly to move along the lengthwise direction of the guide member. In the present application, the camera module has both continuous optical zoom and autofocus functions.