Piezoelectric Lens Driving Module Diagonal Corner Actuation
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Solution Overview
Problem
Conventional camera module lens driving mechanisms are bulky due to complex electromagnetic motor systems, limiting their integration in small devices like mobile phones, and suffer from asymmetrical displacement and limited lens transfer distance, which complicates size reduction and stability.
Innovation Solution
A lens driving module with a piezoelectric motor and bearing system positioned in diagonal corners of the housing, directly transmitting driving force to the lens barrel along the optical axis, eliminating the need for additional components and ensuring stable, vertical lens movement without tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electromagnetic motor is used to drive the lens barrel, then the lens barrel can be moved vertically, but the number of components increases and the camera module size increases
Solution Approach 1:
The patent extracts and removes the electromagnetic motor and final reduction gear from the lens driving mechanism, retaining only the essential bearing and guide components. This extraction eliminates unnecessary components that increase size, while the lens barrel remains movable through alternative driving methods or direct actuation.
Solution Approach 2:
The patent replaces the electromagnetic motor-driven mechanical system with a simplified mechanical guidance system using bearings and guide portions. This substitution eliminates the need for complex electromagnetic actuation and reduction gears, significantly reducing the camera module size while maintaining lens barrel movement capability.
2Ease of operation
If conventional lens driving mechanisms are used, then the lens barrel can be moved, but the mechanical structure becomes complex with additional components
Solution Approach 1:
The patent extracts and removes the electromagnetic motor and final reduction gear from the lens driving mechanism, retaining only the essential bearing and guide components. This extraction eliminates unnecessary components that increase size, while the lens barrel remains movable through alternative driving methods or direct actuation.
Solution Approach 2:
The bearing and guide portion serve multiple functions simultaneously: the bearing supports the lens barrel and enables rotation, while the guide portion constrains movement to the vertical direction. This multi-functionality eliminates the need for separate components, simplifying the mechanical structure.
3Power
If the piezoelectric motor is positioned away from the lens barrel, then the driving force can be transmitted, but asymmetrical displacement occurs and the lens barrel may tilt
Solution Approach 1:
The patent strategically positions the piezoelectric motor in one corner of the housing rather than symmetrically, and uses the diagonal bearing arrangement to compensate for this asymmetry. The guide portion and bearing configuration create a stable triangular support structure that prevents tilting despite the asymmetric motor placement.
Solution Approach 2:
The patent uses the diagonal arrangement of the bearing and piezoelectric motor in the corner of the housing to create a stable three-dimensional support structure. This diagonal positioning in the horizontal plane, combined with vertical guidance, creates a rigid spatial configuration that prevents lateral displacement and tilting of the lens barrel.
4Volume of stationary object
If space is optimized by positioning components in diagonal corners, then the camera module size is reduced, but the driving force transmission path becomes longer
Solution Approach 1:
The bearing serves as an intermediary component that efficiently transmits the driving force from the piezoelectric motor to the lens barrel. The bearing's ball elements provide a low-friction transmission path that compensates for the longer transmission distance resulting from the corner positioning, ensuring effective force transfer despite the increased path length.
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
This configuration reduces the camera module's size by optimizing space usage and ensures stable, efficient lens movement, improving resolution and reducing mechanical complexity.
Implementation Method 1
a piezoelectric motor which is mounted in one outer corner of the housing, which corresponds to the guide portion of the lens barrel, among the outer corners of the housing, and provides a driving force to the lens barrel
Implementation Method 2
a bearing and a piezoelectric motor for vertically driving a lens barrel are disposed in the diagonal corners of the housing, respectively, such that a driving force generated by the piezoelectric motor is directly delivered to the lens barrel along a straight line with respect to the optical axis of the lens barrel
Data Source
AI summary
Provided is a lens driving module including a housing that has a lens barrel housing portion provided therein; a lens barrel that has a bearing contact portion and a guide portion formed on the outer circumferential surface thereof and is mounted in the lens barrel housing portion of the housing; a piezoelectric motor that is mounted in one outer corner of the housing, which corresponds to the guide portion of the lens barrel, among the outer corners of the housing, and provides a driving force to the lens barrel; and a power connection member that is bent so as to cover the piezoelectric motor and the outer circumferential surface of the housing and is coupled to the housing.