Imaging Lens Carrier Guide Tracks for Stable Autofocus Motion
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Solution Overview
Problem
Conventional optical lenses struggle to meet the high movement stability requirements of modern electronic devices, particularly in high-end specifications, due to challenges in achieving precise and stable lens movement for high image quality.
Innovation Solution
An imaging lens driving module with a lens carrier and base featuring guiding tracks with angled surfaces and balls for translational movement, combined with a magnet and coil driving unit, ensures stable and precise lens movement through radial force balance and alignment, enhancing auto-focus stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical lenses are used, then the device structure is simple, but the movement stability and image quality cannot meet high-end specifications
Solution Approach 1:
The guiding track is divided into multiple segments with different surface orientations (first surface, second surface, third surface, fourth surface) that contact different balls. This segmentation allows each ball to be independently positioned and controlled, improving movement stability while maintaining a relatively simple overall structure.
Solution Approach 2:
Multiple balls are introduced as intermediary elements between the lens carrier and base. These balls serve as mediators that enable smooth, stable translational movement along the optical axis while reducing direct contact and friction, thereby improving movement stability without significantly increasing structural complexity.
2Manufacturing precision
If multiple balls and angled surfaces are added for stable movement, then movement stability improves, but device complexity increases
Solution Approach 1:
Different surfaces of the guiding track are designed with different orientations and properties (first surface angled to second surface, third surface angled to fourth surface). This local differentiation allows precise control of ball positions and lens movement at specific locations, improving manufacturing precision while keeping the overall mechanism manageable.
Solution Approach 2:
Spherical balls are used as the moving elements within the guiding tracks. The spherical shape provides smooth rolling motion, reduces friction, and enables precise positional control through the interaction of multiple balls with the angled surfaces, thereby improving lens movement precision.
3Measurement precision
If the lens carrier and base are tightly aligned for precision, then image quality improves, but space utilization decreases
Solution Approach 1:
The lens carrier is designed to move dynamically along the optical axis through the guiding tracks and balls, rather than being fixed. This dynamic capability allows the system to achieve precise alignment during operation while maintaining a compact overall structure that efficiently utilizes the available space within the electronic device.
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 provides improved image quality by ensuring stable lens movement and alignment, optimizing driving efficiency, and effectively utilizing space within electronic devices.
Implementation Method 1
The driving unit includes at least one magnet and at least one coil. The at least one magnet and the at least on coil are disposed corresponding to each other. One of the at least one magnet and the at least one coil is coupled to the lens carrier.
Implementation Method 2
The balls are disposed between the lens carrier and the base. The balls include at least one first ball and at least one second ball. The at least one first ball is disposed between the first guiding track and the third guiding track. The at least one second ball is disposed between the second guiding track and the fourth guiding track.
Data Source
AI summary
An imaging lens driving module includes an imaging lens having an optical axis, a lens carrier mounting the imaging lens, a base disposed corresponding to the lens carrier, balls and a driving unit configured to move the lens carrier with respect to the base along a direction parallel to the optical axis. The lens carrier includes first and second guiding tracks each extending along a direction parallel to the optical axis. The base includes third and fourth guiding tracks each extending along a direction parallel to the optical axis. The third guiding track is disposed corresponding to the first guiding track. The fourth guiding track is disposed corresponding to the second guiding track. The balls include a first ball disposed between the first guiding track and the third guiding track and a second ball disposed between the second guiding track and the fourth guiding track.