Piezoelectric Optical Module for Compact AF and OIS Motion
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Solution Overview
Problem
Modern electronic devices with image capturing functions face challenges in reducing the size of driving mechanisms for auto focus and optical image stabilization while maintaining durability and versatility in capturing images from different directions.
Innovation Solution
An optical system with a piezoelectric driving assembly that includes a movable portion connected to an optical element, driven by a transmission element with a resilient structure, and a circuit assembly for precise movement control, allowing for efficient and compact auto focus and optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional driving mechanism is used for auto focus and optical image stabilization, then the device can capture images with basic functionality, but the device size becomes large and durability is reduced
Solution Approach 1:
The patent combines the auto focus driving mechanism and optical image stabilization mechanism into a single integrated driving assembly. The driving assembly includes a piezoelectric element that can simultaneously control lens movement for both auto focus and stabilization functions, eliminating the need for separate driving mechanisms and thereby reducing overall device volume while maintaining durability through unified structural design
Solution Approach 2:
The patent replaces conventional mechanical driving mechanisms with a piezoelectric driving assembly. The piezoelectric element converts electrical signals directly into precise mechanical movements of the lens, eliminating complex mechanical linkages, gears, and motors. This substitution significantly reduces the volume of moving parts while improving durability by removing mechanical wear components
2Volume of moving object
If the driving mechanism size is reduced for compact device design, then device portability improves, but the precision and reliability of auto focus and optical image stabilization deteriorate
Solution Approach 1:
The patent employs a piezoelectric element that provides precise control of lens movement through electrical signals. The piezoelectric material exhibits linear and reversible deformation in response to applied voltage, enabling extremely fine positional control of the lens. This electrical-to-mechanical conversion achieves high measurement precision while maintaining a compact driving mechanism size, as the piezoelectric element requires minimal space compared to conventional mechanical actuators
Solution Approach 2:
The patent utilizes the unique properties of piezoelectric materials that allow for precise control of deformation magnitude through voltage parameter adjustment. By changing the voltage applied to the piezoelectric element, the lens position can be precisely controlled with high resolution. This parameter-based control enables accurate auto focus and stabilization movements within a compact form factor
3Ease of manufacture
If a simple driving structure is used to reduce manufacturing complexity, then manufacturing cost decreases, but the capability to capture images from different directions is limited
Solution Approach 1:
The driving assembly is designed with multi-functionality to support both auto focus and optical image stabilization operations. The same piezoelectric element and transmission mechanism can perform different functions by receiving different control signals, enabling the device to capture images from various directions and distances without requiring separate specialized mechanisms for each function
Solution Approach 2:
The patent incorporates a resilient element that provides dynamic adjustment capability to the driving structure. This resilient component allows the system to adapt to different operational conditions and directional requirements while maintaining a relatively simple overall structure. The dynamic characteristics enable versatile image capture from different directions without significantly increasing manufacturing 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 optical system achieves precise and efficient movement of optical elements, enabling smaller device sizes with improved durability and versatility in capturing images from various directions, enhancing auto focus and optical image stabilization capabilities.
Implementation Method 1
The driving source includes a first piezoelectric element
Implementation Method 2
a resilient element disposed on the first piezoelectric element
Data Source
AI summary
An optical system is provided. The optical system includes a first optical module. The first optical module includes a fixed portion, a movable portion, a driving assembly, and a circuit assembly. The movable portion is movably connected to the fixed portion, and the movable portion is used to connect to an optical element. The driving assembly is used to drive the movable portion to move relative to the fixed portion. The circuit assembly is electrically connected to the driving assembly.