Camera Module Ball Support Layout for Lens Tilt Prevention
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Solution Overview
Problem
Camera modules in mobile communications terminals face challenges in preventing lens module tilt during focus adjustment due to size differences in ball bearings, leading to resolution degradation as the module size decreases.
Innovation Solution
A camera module design incorporating a housing with a driving unit, magnet, coil, and ball members with varying sizes and arrangements to ensure stable contact and prevent tilt, utilizing a yoke to generate an attractive force that maintains contact between the ball members and the lens module, thereby maintaining parallel movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ball bearings of uniform size are used to support the lens module, then manufacturing precision is improved, but it becomes difficult to ensure all ball bearings contact the lens module uniformly due to size variations
Solution Approach 1:
The patent applies local quality by creating different receiving space lengths for different ball bearings. Specifically, the first receiving space has a different length than the second receiving space, allowing each ball bearing position to be optimized for its specific ball size. This ensures that ball bearings of varying sizes can all contact the lens module uniformly, resolving the contradiction between manufacturing precision and contact stability.
2Volume of moving object
If the lens module size is reduced to fit mobile terminals, then device compactness is improved, but tilt occurs during movement causing resolution degradation
Solution Approach 1:
The patent applies parameter changes by modifying the receiving space lengths to compensate for the reduced camera module size. By adjusting the first receiving space length and second receiving space length differently, the system maintains proper lens module parallelism and prevents tilt during movement, even as the overall module size is reduced for compactness.
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 design effectively prevents tilt during lens module movement, ensuring stable focus adjustment and maintaining image resolution by ensuring the center of the attractive force remains within the support region, even with varying ball sizes and arrangements.
Implementation Method 1
a yoke generating attractive force with the magnet
Data Source
AI summary
A camera module includes a housing accommodating a lens module, a driving unit including a magnet disposed on the lens module and a coil disposed to face the magnet, a yoke generating attractive force with the magnet, a first ball member accommodated in a first receiving space disposed between the lens module and the housing, and pressed by the attractive force, and a second ball member accommodated in a second receiving space disposed between the lens module and the housing, and pressed by the attractive force. A length of the first receiving space in an optical axis direction is different from a length of the second receiving space in the optical axis direction.