Camera Module Axial Assembling Structures Alignment
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Solution Overview
Problem
Conventional camera driver modules for auto focus in electronic devices face challenges with complex structures, alignment, and calibration requirements, leading to manufacturing inefficiencies and poor peripheral image quality due to focus shifts and tilting issues.
Innovation Solution
A camera module design incorporating an imaging lens module, axial driving device, and image sensor module with a simplified structure, utilizing a micro-electro-mechanical system actuator or piezoelectric motor, and featuring axial assembling structures to align the lens and image sensor precisely, preventing focus shift and tilting, and enabling miniaturization and high precision assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voice coil motor (VCM) is used as camera driver module for auto focus, then the lens unit can be driven to move, but multiple alignment and calibration steps are needed during assembly, resulting in complex structure and low manufacturing efficiency
Solution Approach 1:
The patent integrates the lens holder, driving mechanism, and image sensor support into a unified modular structure. The lens holder directly supports the image sensor module, eliminating the need for separate alignment and calibration steps between components. This merging of functions reduces assembly complexity while maintaining focus accuracy through the integrated design.
Solution Approach 2:
The camera module is divided into distinct functional modules: the lens element, the lens holder with integrated driving mechanism, and the image sensor module. Each module is designed and assembled independently with precise positioning features, then combined as a complete unit. This segmentation allows for simplified individual module assembly while achieving overall system precision.
2Manufacturing precision
If multiple alignment and calibration steps are performed during assembly, then assembling accuracy can be achieved, but manufacturing efficiency and yield rate are reduced
Solution Approach 1:
The lens holder and image sensor module are pre-assembled with built-in positioning features and alignment structures before final integration. The optical axis alignment is established through precision-machined reference surfaces and locating pins that are prepared in advance, eliminating the need for time-consuming alignment and calibration steps during final assembly. This preliminary preparation of components with integrated positioning features significantly reduces assembly time while maintaining high precision.
3Ease of operation
If lens unit tilts during operation, then focus can be adjusted, but focus shift occurs between optimal imaging position and image sensor, resulting in poor peripheral image quality
Solution Approach 1:
The patent employs a driven lens mechanism where the lens element is moved along the optical axis by a driving mechanism (such as a piezoelectric actuator or electromagnetic driver) integrated into the lens holder. This dynamic positioning system allows continuous focus adjustment by moving the lens forward and backward while maintaining perpendicular alignment with the image sensor, eliminating focus shift and peripheral quality degradation that occurs with tilting mechanisms.
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 design enhances manufacturing efficiency, improves image quality, and maintains high precision alignment, addressing the complexity and inefficiencies of conventional camera driver modules by simplifying the assembly process and preventing focus shifts and tilting.
Implementation Method 1
utilizing a micro-electro-mechanical system actuator or piezoelectric motor
Implementation Method 2
utilizing a micro-electro-mechanical system actuator or piezoelectric motor
Implementation Method 3
The image sensor is configured to convert light passing through the imaging lens module into an image signal
Data Source
AI summary
A camera module includes an imaging lens module, an axial driving device and an image sensor module. The imaging lens module includes at least one optical imaging lens element. The axial driving device is configured to drive the optical imaging lens element to move in a direction parallel to an optical axis. The image sensor module is disposed on an image side of the axial driving device and includes an image sensor and a substrate. The image sensor is configured to convert light passing through the imaging lens module into an image signal. The axial driving device includes a base, and the base has a first axial assembling structure. The substrate has a second axial assembling structure abutted against the first axial assembling structure, so that the imaging lens module is aligned with the image sensor module in a direction along the optical axis.