Piezoelectric Lens Driving Module Tension Reduction
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Solution Overview
Problem
Conventional camera modules with electromagnetic motors face challenges in miniaturization due to increased component count and complexity, limiting their application in small-sized devices like mobile phones, and piezoelectric-driven mechanisms suffer from structural complexity and limited lens transfer distance.
Innovation Solution
A lens driving module featuring a piezoelectric motor mounted in one corner of a housing with a power connection member and bearing system, which reduces tension and ensures reliable force delivery to the lens barrel, utilizing a hexahedral piezoelectric ultrasonic motor and flexible printed circuit board for efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electromagnetic motor is used to drive the lens barrel, then the lens can be transferred vertically, but the number of components increases and the device size increases
Solution Approach 1:
The patent replaces the electromagnetic motor with a piezoelectric motor that directly contacts the lens barrel. This substitution eliminates the need for complex mechanical transmission components such as gears and cam mechanisms, achieving lens barrel transfer while reducing overall device complexity and size.
Solution Approach 2:
The patent introduces a power connection member with through-holes as an intermediary component. This member serves dual functions: providing electrical power to the piezoelectric motor and acting as a bearing support structure. The through-holes specifically reduce tension on the power connection member, enabling it to reliably transmit power while supporting mechanical loads.
2Power
If an electromagnetic motor with reduction gear is used, then the lens can be driven, but the mechanical structure becomes complex
Solution Approach 1:
The patent replaces the electromagnetic motor with a piezoelectric motor that generates sufficient driving force directly through piezoelectric expansion and contraction. This eliminates the need for reduction gears and other mechanical transmission components, achieving both adequate power transmission and simplified mechanical structure.
Solution Approach 2:
The power connection member is segmented with through-holes that divide the structural tension paths. This segmentation allows the single component to simultaneously provide power transmission, bearing support, and tension distribution functions, reducing overall mechanical complexity.
3Volume of moving object
If the camera module is miniaturized for mobile phones, then the device size is reduced, but the assembly becomes difficult due to limited space
Solution Approach 1:
The patent merges multiple functions into the power connection member: electrical power transmission, mechanical bearing support, and tension distribution. This consolidation reduces the total number of components that need to be assembled in the limited space of a miniaturized camera module, making assembly easier while maintaining compact dimensions.
Solution Approach 2:
The power connection member is designed as a universal component that performs multiple functions simultaneously: providing electrical power to the piezoelectric motor, supporting mechanical loads as a bearing, and distributing tension through its through-holes. This multi-functionality reduces component count and simplifies assembly in space-constrained applications.
4Object-generated harmful factors
If a piezoelectric motor is used, then electromagnetic interference is reduced, but the structure becomes complex
Solution Approach 1:
The patent uses a piezoelectric motor that converts electrical energy directly to mechanical motion through piezoelectric expansion and contraction, eliminating electromagnetic fields and their associated interference. The motor's direct-contact design with the lens barrel further simplifies the mechanical structure by eliminating transmission components.
Solution Approach 2:
The power connection member with through-holes acts as an intermediary that simplifies the overall structure by combining power transmission and mechanical support functions in a single component, counteracting any potential structural complexity from the piezoelectric motor integration.
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 enables reliable vertical driving of the lens barrel with reduced structural complexity and tension, enhancing the efficiency and miniaturization potential of camera modules for small-sized devices by minimizing electromagnetic interference and mechanical complexity.
Implementation Method 1
piezoelectric motor which vertically drives the lens barrel
Implementation Method 2
hexahedral piezoelectric ultrasonic motor
Implementation Method 3
bearing coupling portion and bearing contact portion
Data Source
AI summary
Provided is a lens driving module including a housing that has a lens barrel housing portion provided in the central portion thereof, the lens barrel housing portion having a bearing coupling portion and a guide coupling portion provided therein, and a through-hole formed in one corner thereof where the guide coupling portion is formed; 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 such that the bearing contact portion and the guide portion correspond to the bearing coupling portion and the guide coupling portion of the lens barrel housing portion, respectively; a piezoelectric motor that is mounted in the through-hole formed in one outer corner of the housing, which corresponds to the guide portion of the lens barrel, among the outer corners of the housing; a power connection member that is attached on the outer surface of the piezoelectric motor and of which only a predetermined portion connected to a power supply exhibits conductivity; and a power connection member that surrounds the outer surface of the housing and includes a corner-bent surface having a cross-shaped pad formation portion and a pair of through-holes formed in both sides of the pad formation portion, the through-holes reducing tension.