Camera Module Yoke Asymmetry for Lens Tilting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The tilting phenomenon of a lens barrel during movement in the optical axis direction in camera modules, caused by manufacturing tolerances leading to partial separation of ball bearings, results in unstable focus adjustment and image quality deterioration.
Innovation Solution
A camera module design incorporating a magnet, a coil, and an asymmetrical yoke member with protrusions to generate a biased magnetic force, combined with bearing members of varying sizes, which ensures stable movement of the lens barrel by minimizing contact friction and alleviating the tilting issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ball bearings are used to guide lens barrel movement, then smooth movement is enabled, but partial separation of contact occurs due to manufacturing tolerance causing tilting phenomenon
Solution Approach 1:
The patent applies asymmetry by configuring the yoke member with different surface areas on opposite sides (first surface area in first region vs. second surface area in second region) and different masses (first mass in first region vs. second mass in second region). This asymmetric design creates a biased magnetic force that compensates for manufacturing tolerances in the ball bearings, ensuring consistent contact and eliminating the tilting phenomenon during lens barrel movement.
Solution Approach 2:
The patent changes the magnetic force parameter by introducing a yoke member with asymmetric surface area and mass distribution. This creates a biased magnetic force field that dynamically compensates for contact separation in the ball bearings, maintaining stable lens barrel movement without requiring higher manufacturing precision.
2Ease of manufacture
If symmetrical yoke member is used, then manufacturing is simpler, but biased magnetic force cannot be generated to correct tilting
Solution Approach 1:
The patent deliberately introduces asymmetry in the yoke member design with different surface areas and masses on opposite sides. While this increases manufacturing complexity compared to a symmetrical design, it enables the generation of biased magnetic force necessary to correct the tilting phenomenon and ensure reliable, stable lens barrel movement.
3Ease of manufacture
If uniform bearing sizes are used, then assembly is easier, but tilting phenomenon cannot be adequately corrected
Solution Approach 1:
The patent segments the bearing system by using bearing members of different sizes (first bearings of first size and second bearings of second size greater than the first size) positioned at different locations. This segmentation, combined with the asymmetric yoke member, allows differential compensation for contact separation on opposite sides of the lens barrel, improving contact stability without requiring completely uniform assembly procedures.
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 stabilizes the movement of the lens barrel, enhancing the camera module's focus adjustment and image quality by maintaining consistent contact with bearing members, thus reducing the tilting phenomenon and improving overall performance.
Implementation Method 1
a magnet and a coil configured to provide a driving force required to move the lens module in the optical axis direction
Implementation Method 2
a yoke member disposed on the housing and configured to interact with the magnet to generate a biased magnetic force
Implementation Method 3
a lens module configured to move by rolling friction in an optical axis direction
Data Source
AI summary
A camera module includes: a magnet disposed on a lens module; a bearing member disposed in a ball guide portion formed between the lens module and a housing that accommodates the lens module; a coil disposed in the housing to face the magnet; and a yoke member disposed on the housing to interact with the magnet to generate a biased magnetic force.