Camera Lens Moving Module With EMI Shielding and Position Feedback
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Solution Overview
Problem
Conventional camera modules face issues with electromagnetic interference (EMI) and slow auto focusing due to hysteresis and repeatability, leading to inefficient performance in functions like auto focusing and miniaturization.
Innovation Solution
A lens moving apparatus with a bobbin, coil, and driving magnet system, integrated with EMI shielding and a displacement sensing unit, allows for rapid and accurate auto focusing by controlling the lens position using a focus controller and lookup table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If EMI shielding is added to the camera module, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent combines the EMI shielding function with the existing housing structure by integrating an EMI shielding layer into the housing. This merging approach allows the housing to serve dual purposes: mechanical support and electromagnetic interference protection, thereby reducing overall device complexity while still providing effective EMI shielding.
Solution Approach 2:
The patent introduces an EMI shielding layer as an intermediary component between the internal components (coil and sensor) and the external environment. This intermediary layer blocks electromagnetic interference without requiring complete redesign of the housing structure, thus managing EMI protection with minimal added complexity.
2Measurement precision
If position recognition capability is added to the camera module, then auto focusing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the displacement sensing unit continuously monitors the lens position and provides this information to the control unit. The control unit uses this feedback to adjust the voice coil actuator, creating a closed-loop system that improves focusing accuracy without requiring complex additional position recognition hardware.
Solution Approach 2:
The displacement sensing unit automatically detects and reports the lens position to the control unit without external intervention. This self-service capability allows the system to maintain accurate position recognition using existing components, avoiding the need for additional complex position sensing systems.
3Volume of moving object
If miniaturization is pursued in the camera module, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the camera module into distinct functional segments: the housing, the EMI shielding layer, the voice coil actuator, the displacement sensing unit, and the lens assembly. This segmentation allows each component to be manufactured and assembled separately with controlled precision requirements, making miniaturization more achievable without excessive manufacturing difficulty.
Solution Approach 2:
The patent optimizes key dimensional parameters of the housing and internal components to achieve miniaturization. By carefully selecting and controlling critical dimensions and tolerances in the housing design, the system achieves compact size while maintaining manufacturability through standardized precision levels rather than requiring extremely tight tolerances throughout.
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 apparatus effectively shields EMI and enhances auto focusing speed and accuracy, enabling miniaturized high-pixel camera modules with improved performance.
Implementation Method 1
a coil and a driving magnet arranged opposite to each other for moving the bobbin in an optical axis direction of the lens through interaction therebetween
Implementation Method 2
The first circuit board may include an electromagnetic interference (EMI) shielding terminal for connecting the cover can to the second circuit board
Implementation Method 3
a displacement sensing unit for sensing a first displacement value of the bobbin in the optical axis direction
Data Source
AI summary
A lens moving apparatus is disclosed. The lens moving apparatus includes a bobbin equipped with at least one lens, a coil and a driving magnet arranged opposite to each other for moving the bobbin in an optical axis direction of the lens through interaction therebetween, a first circuit board for supplying electric current required by the coil, and a cover can and a base coupled to, contacted to, supported at, fixed to, or temporarily fixed to each other for forming a space in which the bobbin, the driving magnet, and the first circuit board are received, wherein the cover can is connected to a second circuit board having an image sensor mounted thereon.