Piezoelectric Variable Aperture Drive for Magnet-Immune Camera Control
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Solution Overview
Problem
Conventional variable aperture camera modules face challenges in accurately adjusting aperture hole size due to electromagnetic interference and limited range of adjustment, which affects imaging quality and reliability.
Innovation Solution
A driving apparatus using a piezoelectric ceramic to deform and rotate a rotation ring, adjusting the aperture hole size without reliance on magnetic forces, allowing for a wider range of adjustment and improved reliability, while also enabling miniaturization and high response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voice coil motor is used to drive blade movement for adjusting aperture hole size, then the aperture can be adjusted, but electromagnetic interference occurs making it difficult to accurately adjust the aperture hole size
Solution Approach 1:
The patent replaces the electromagnetic voice coil motor with a piezoelectric ceramic actuator that converts electrical signals directly to mechanical deformation. This substitution eliminates electromagnetic interference while maintaining the ability to drive blade rotation and adjust aperture size, thereby improving measurement precision without suffering from electromagnetic harmful factors.
Solution Approach 2:
The patent changes the actuation mechanism from electromagnetic field-based to piezoelectric deformation-based. By utilizing the piezoelectric effect where electrical parameters directly control mechanical displacement, the system achieves accurate aperture adjustment without electromagnetic interference, resolving the contradiction between precision and harmful electromagnetic factors.
2Adaptability or versatility
If a magnet and coil are used to control aperture hole size, then the aperture can be adjusted, but the adjustment range is limited due to upper limit of magnetic forces
Solution Approach 1:
The patent substitutes the magnetic force-based actuation system with a piezoelectric actuation system. The piezoelectric ceramic can generate larger deformation forces without the upper limit constraints of magnetic forces, enabling a wider adjustment range of aperture hole sizes while maintaining adaptability across different lighting conditions.
Solution Approach 2:
The patent changes the controlling parameter from magnetic field strength to piezoelectric voltage signal. This parameter change allows for continuous and wide-range adjustment of the aperture hole size, overcoming the magnetic force saturation limit and expanding the system's adaptability to various aperture requirements.
3Ease of operation
If a magnet and coil are used in the variable aperture, then the aperture can be controlled, but the width and length of the variable aperture increase to a large extent
Solution Approach 1:
The patent replaces the bulky magnet and coil assembly with a compact piezoelectric ceramic actuator. This substitution significantly reduces the width and length of the variable aperture structure while preserving the aperture control capability, making the camera module more suitable for miniaturization applications.
Solution Approach 2:
The patent changes from an electromagnetic actuation system requiring large magnetic components to a piezoelectric system with compact dimensions. This parameter change in actuation mechanism enables reduced aperture structure size while maintaining full control functionality, addressing the contradiction between operational ease and compact area.
4Ease of operation
If a magnet and coil are used in the variable aperture, then the aperture can be controlled, but the variable aperture is prone to faulty due to interference of external magnetism or magnetic conductive component
Solution Approach 1:
The patent substitutes the electromagnetic actuation system with a piezoelectric actuation system that is inherently immune to external magnetic interference. This replacement eliminates the vulnerability to external magnetism and magnetic conductive components while preserving the aperture control function, thereby improving reliability without sacrificing operational capability.
Solution Approach 2:
The patent changes the actuation principle from electromagnetic interaction to piezoelectric deformation. This fundamental parameter change makes the system insensitive to external magnetic fields and magnetic conductive materials, enhancing reliability while maintaining ease of aperture control through electrical signal input.
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 provides accurate and reliable adjustment of aperture hole size, enhancing imaging quality, and facilitating miniaturization of camera modules by eliminating interference from external magnetism and magnetic conductive components, and offering high response speed.
Implementation Method 1
The piezoelectric ceramic is configured to deform under signal control, to drive the rotation ring to rotate relative to the base
Data Source
AI summary
This application provides a driving apparatus and an electronic device. The driving apparatus may be applied to the electronic device. The driving apparatus includes a variable aperture. A piezoelectric ceramic of the variable aperture is configured to deform under signal control, to drive a rotation ring of the variable aperture to rotate relative to a base of the variable aperture. Each blade of the variable aperture rotates relative to the rotation ring and slides relative to a first protrusion part of the base, and a hole diameter of an aperture hole of the variable aperture changes. A change range of the aperture hole of the variable aperture in this application is not easily affected by an external magnetic force of the variable aperture.