Lens Module Buffer Unit and Segmented Coil Design
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Solution Overview
Problem
Lens modules face issues with noise generation and potential damage due to collisions between moving lens groups and other elements during auto focusing, zooming, or optical image stabilization operations, and the installation of driving devices is complicated by position accuracy requirements and unstable assembly quality.
Innovation Solution
The lens module incorporates a base, a movable lens group, a magnet portion, and a coil portion, with the magnet and coil arranged to minimize noise and ensure stable operation, using monopole or multi-pole magnets and coils with specific dimensions and current distributions to control electromagnetic forces, and includes a buffer unit to absorb collisions and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If moving lens groups are used for auto focusing, zooming, or OIS operation, then the functional capability of the lens module is improved, but collisions between moving lens groups and other elements may occur generating noise and potential damage
Solution Approach 1:
The patent introduces a buffer unit made of elastic material positioned between the movable lens group and the aperture stop. This buffer unit proactively cushions potential collisions before they occur, absorbing impact energy and preventing direct contact between hard surfaces, thereby eliminating noise and preventing damage while preserving the movement functionality of the lens group.
2Extent of automation
If coils of the driving device are installed on the base of the lens module, then the driving function is achieved, but position accuracy requirements and assembly line constraints make installation difficult and assembly quality unstable
Solution Approach 1:
The patent divides the driving device into separate magnet portion and coil portion that can be independently manufactured and then assembled. The magnet is attached to the movable lens group while the coil is positioned on the base, allowing each component to be produced separately with standard tolerances and then combined, eliminating the need for precise pre-positioning and complex soldering operations.
Solution Approach 2:
The patent introduces a flexible circuit board as an intermediary component to connect the coil to the power source. This flexible circuit board can be easily routed and connected without requiring precise positioning of the coil itself, simplifying the assembly process and reducing the impact of positioning tolerances on overall assembly quality.
3Use of energy by moving object
If soldering of conducting lines of the coils to the flexible circuit board is required, then power supply to the coils is achieved, but the soldering process is tricky and reduces manufacturing efficiency
Solution Approach 1:
The patent replaces the traditional soldering process with a mechanical connection system using the flexible circuit board. The conducting lines are mechanically connected to the coil terminals through press-fit or snap-fit connections, eliminating the need for thermal soldering processes. This substitution removes the tricky soldering step entirely while maintaining reliable electrical connectivity and significantly improving manufacturing efficiency.
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 reduces noise and prevents damage from collisions, enhances assembly quality by simplifying coil installation, and ensures seamless control of lens group movement with stable electromagnetic forces.
Implementation Method 1
the coil portion is supplied with power to generate a magnetic field that acts on the magnet portion, and the movable lens group is driven to move along the optical axis when the coil portion is supplied with power to generate a magnetic force that acts on the magnet portion
Data Source
AI summary
A lens module includes a base, a movable lens group, a magnet portion and a coil portion. The movable lens group is movable in a first direction and has an optical axis in parallel to the first direction. The magnet portion is disposed on one of the base and the movable lens group. The coil portion is disposed on the other of the base and the movable lens group and is disposed corresponding to the magnet portion.