Camera Lens Mover With EMI Shielding and Displacement 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 arrangement, coupled with EMI shielding and a displacement sensing unit, allows for rapid and accurate auto focusing by integrating an EMI shielding terminal and a cover can to connect with a second circuit board, ensuring precise lens positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If EMI shielding is added to conventional camera modules, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent combines the EMI shielding function with the existing cover can structure by integrating an EMI shielding terminal that electrically connects the cover can to the second circuit board. This merging approach allows the shielding function to be added without requiring a completely separate shielding structure, thus reducing the increase in device complexity while still providing effective EMI protection.
Solution Approach 2:
The EMI shielding terminal acts as an intermediary element that bridges the cover can and the second circuit board electrically. This intermediary component enables EMI shielding by providing a conductive path to ground for electromagnetic interference, while being relatively simple in structure to minimize added complexity.
2Productivity
If conventional camera modules are used without position recognition, then device complexity is lower, but auto focusing speed and accuracy deteriorate
Solution Approach 1:
The patent introduces a displacement sensing unit that provides feedback on the lens barrel's position during auto focusing. This feedback mechanism enables the system to recognize the subject position and adjust focusing accordingly, significantly improving auto focusing speed and accuracy. The feedback loop allows for real-time position recognition and adaptive focusing control.
Solution Approach 2:
The patent replaces purely mechanical focusing methods with a system that uses displacement sensing (electrical/optical detection) to recognize subject position and control focusing. This substitution of mechanical position recognition with sensing-based recognition improves both speed and accuracy while adding manageable complexity through the sensing unit and control mechanism.
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 effectively shields EMI and enhances auto focusing speed and accuracy, addressing the issues of conventional camera modules by providing a miniaturized and efficient lens movement system.
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
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.