Camera Module Magnet Segmentation for Linear Autofocus Movement
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Solution Overview
Problem
Existing camera modules in portable electronic devices face challenges in ensuring linearity of movement during autofocusing operations, which can lead to tilt issues.
Innovation Solution
A camera module design incorporating a focus adjustment unit with a focus adjustment magnet and coil configuration, along with a first ball group to guide movement, and a substrate with a patterned focus adjustment coil and position sensor, enhances focusing performance while reducing part count and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional focus adjustment mechanism is used, then the camera module can perform autofocusing, but the movement linearity is poor causing tilt issues
Solution Approach 1:
The focus adjustment magnet is divided into multiple segments along the optical axis direction, with each segment creating a localized magnetic field. This segmentation allows independent optimization of magnetic field distribution at different positions, enabling the carrier to move along a linear path without tilting while maintaining effective focus adjustment across the entire range.
2Reliability
If multiple separate components are used for focus adjustment, then the functionality is complete, but the number of parts and manufacturing cost increase
Solution Approach 1:
The focus adjustment magnet and position sensor are integrated into a single carrier structure. The magnet is disposed on the carrier along with the position sensor, eliminating the need for separate mounting components and reducing the overall part count while maintaining the functional independence and performance of both components.
Solution Approach 2:
The carrier serves multiple functions: it holds the lens module, supports the focus adjustment magnet, accommodates the position sensor, and provides the moving structure for focus adjustment. This multi-functionality reduces the number of separate components needed in the focus adjustment mechanism.
3Manufacturing precision
If the gap between magnet and coil is uniform, then the structure is simple, but the magnetic field distribution is suboptimal for precise focusing
Solution Approach 1:
The gap between the focus adjustment magnet and the focus adjustment coil is designed to be non-uniform, with different gap distances at different longitudinal positions of the magnet. This local variation in gap quality optimizes the magnetic field strength and distribution at each position, enabling more precise focus adjustment while the overall structure remains relatively simple.
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 improves focusing performance by ensuring linearity of movement and reduces the number of parts and manufacturing costs, while maintaining stability and tilt correction.
Implementation Method 1
a focus adjustment coil disposed on the housing to face the focus adjustment magnet, and configured to generate a driving force to move the carrier in the optical axis direction
Implementation Method 2
a first ball group disposed between the carrier and the housing to guide movement of the carrier in the optical axis direction
Data Source
AI summary
A camera module is provided. The camera module includes a lens module including at least one lens, a carrier that accommodates the lens module and is configured to move in an optical axis direction, a housing that accommodates the carrier, a focus adjustment driving unit including a focus adjustment magnet disposed on the carrier and a focus adjustment coil disposed on the housing to face the focus adjustment magnet and configured to generate a driving force to move the carrier in the optical axis direction, and a first ball group disposed between the carrier and the housing to guide movement of the carrier in the optical axis direction, wherein a gap between the focus adjustment magnet and the focus adjustment coil increases or decreases in a longitudinal direction of the focus adjustment magnet.