Piezoelectric Camera Module Layout for Stable OIS Lens Drive
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Solution Overview
Problem
Existing electromagnetic motors, such as Voice Coil Motors (VCM) and Shape Memory Alloy Actuators (SMA), struggle to provide sufficient driving force and stability for optical components in camera modules due to increased weight and magnetic field interactions, especially when the optical components exceed 100 mg and the distance between magnets is less than 7 mm, which is exacerbated by the miniaturization and thinness trends in mobile devices.
Innovation Solution
A camera module utilizing a piezoelectric actuator with a rational arrangement scheme, including a piezoelectric active portion and friction driving portion, provides sufficient driving force and stability for optical components, enabling optical image stabilization with higher accuracy and a longer stroke, while adapting to the structural and dimensional requirements of the module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If electromagnetic motors (VCM, SMA) are used to drive optical components, then the driving mechanism is simple and compact, but the driving force becomes insufficient when optical component weight exceeds 100 mg
Solution Approach 1:
The patent replaces electromagnetic motors (VCM, SMA) with a piezoelectric actuator that uses piezoelectric ceramic elements to generate mechanical motion through electrical excitation. This substitution provides sufficient driving force for optical components exceeding 100 mg while maintaining a compact structure, as the piezoelectric actuator generates linear displacement directly without requiring complex electromagnetic components.
Solution Approach 2:
The patent changes the driving mechanism from electromagnetic to piezoelectric, fundamentally altering the physical principle used to generate motion. The piezoelectric actuator uses alternating voltage signals to excite piezoelectric ceramic elements, producing ultrasonic vibrations that generate acoustic radiation pressure to drive the optical component, thereby achieving sufficient driving force for heavier components.
2Volume of moving object
If the distance between magnets in VCM is reduced to achieve miniaturization, then the device size decreases, but magnetic field interactions cause magnet displacement and vibration
Solution Approach 1:
The patent eliminates the magnetic field interaction problem by replacing the electromagnetic motor structure with a piezoelectric actuator. The new design uses piezoelectric ceramic elements excited by alternating voltage to generate ultrasonic vibrations, which produce acoustic radiation pressure to drive the optical component. This substitution removes magnets entirely, preventing magnetic field interactions and associated instability.
3Manufacturing precision
If optical components are made larger to increase pixel count, then the imaging performance improves, but the weight increases beyond the driving capability of existing motors
Solution Approach 1:
The patent changes the physical driving mechanism from electromagnetic to piezoelectric, enabling the system to handle heavier optical components. The piezoelectric actuator generates linear displacement through ultrasonic vibrations and acoustic radiation pressure, providing sufficient driving force for large, high-pixel optical components that exceed 100 mg, thereby supporting improved imaging performance.
4Length of stationary object
If the camera module is made thinner to meet miniaturization requirements, then the device profile improves, but the available space for driving elements is reduced
Solution Approach 1:
The patent replaces complex electromagnetic motor structures with a compact piezoelectric actuator that achieves equivalent or superior driving performance in a smaller footprint. The piezoelectric actuator's direct linear displacement mechanism eliminates the need for coils, magnets, and complex mechanical assemblies, enabling thinner camera module design while maintaining driving capability.
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 actuator offers improved driving performance, meeting the demands for optical performance adjustment and aligning with the camera module's development towards lightness and thinness, overcoming the limitations of traditional drivers.
Implementation Method 1
the camera module uses a new piezoelectric actuator as a driving element
Implementation Method 2
a friction driving portion, wherein after the piezoelectric actuator is turned on, the friction driving portion is configured to provide a driving force
Data Source
AI summary
Disclosed is a camera module, which uses a new piezoelectric actuator as a driving element to meet the driving requirement of the camera module. Specifically, the camera module uses the new piezoelectric actuator as the driving element to move an optical camera lens for optical image stabilization. Moreover, the piezoelectric actuator is arranged in the camera module in a rational arrangement scheme, so as to meet both the structural design requirement and the dimensional design requirement of the camera module.