Lens Assembly Wheel Groove Layout for Low-Friction Zoom Alignment
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Solution Overview
Problem
Existing camera modules face issues such as friction torque, lens decentering, lens tilting, and reduced reliability in measuring lens position during zooming, particularly in compact modules, which affect image quality and resolution.
Innovation Solution
A lens assembly design featuring a first pin and a first wheel with a groove that minimizes friction by ensuring the upper end of the rotation part is positioned lower than the pin's horizontal central axis, and includes a bushing between the rotation shaft and housing, along with a position sensor and Hall sensor arrangement to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the separation in the moving area is increased to reduce frictional torque resistance, then friction torque is reduced, but lens decenter or lens tilting occurs
Solution Approach 1:
The lens moving area is divided into multiple independent guide pins distributed around the optical axis. Each guide pin independently guides a corresponding lens, preventing friction torque while maintaining lens alignment through distributed support points rather than a single contact area
Solution Approach 2:
The guide pins are arranged in a radial pattern around the optical axis, transitioning from a single-dimensional linear guide to a multi-dimensional radial distribution. This spatial arrangement reduces friction torque by distributing contact points while maintaining precise lens alignment through geometric constraints
2Volume of moving object
If the camera module is made compact to reduce size, then portability is improved, but space for zooming is limited
Solution Approach 1:
The lens groups are designed to move dynamically along radial trajectories defined by the guide pins during zooming. This dynamic movement pattern allows compact lens groups to achieve effective zooming within limited space by utilizing radial motion paths rather than traditional linear extensions
Solution Approach 2:
Multiple lens groups are arranged in a nested configuration along the optical axis, with each lens group capable of radial movement guided by corresponding pins. This nesting allows multiple moving components to coexist in a compact volume while maintaining zooming capability through coordinated radial displacements
3Object-generated harmful factors
If the groove depth is increased to reduce friction, then friction torque is reduced, but lens decenter occurs
Solution Approach 1:
The guide pins have non-uniform cross-sectional shapes with different properties at different locations. The pin cross-section is designed to provide appropriate clearance in radial directions for friction reduction while maintaining tight constraints in axial directions for centering precision, achieving local optimization of both functions
Data Source
AI summary
A lens assembly according to an embodiment may comprise: a first pin; a first housing which moves along the first pin; a first lens group arranged in the first housing; and a first wheel which is arranged in the first housing and moves along the first pin. The first wheel may include a first rotation shaft coupled to the first housing, and a first rotation part which rotates about the first rotation shaft. The first rotation part may include a groove corresponding to the first pin, wherein the maximum depth of the groove may be less than one-half the maximum thickness of the first pin in a direction perpendicular to the first rotation shaft.