Optical Driving Mechanism Stopper Surface Roughness
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Solution Overview
Problem
During reliability tests or due to impacts like falls, components in optical driving mechanisms can generate fragments and debris, affecting imaging quality.
Innovation Solution
The optical driving mechanism incorporates stopper components with specific surface roughness and materials to limit the movement of movable portions, reducing fragment generation upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical driving mechanism uses conventional stopper components with smooth surfaces, then the moving range is limited, but fragments and debris are generated during impact
Solution Approach 1:
The patent applies different surface roughness characteristics to different regions of the stopper component. Specifically, the first stopper surface has a roughness of 0.6-2.0 μm while the second stopper surface has a roughness of 0.05-0.5 μm. This local differentiation allows the rougher first surface to effectively suppress fragment generation during impact, while the smoother second surface maintains proper optical contact and limiting function.
Solution Approach 2:
The patent changes the physical parameter of surface roughness to resolve the contradiction. By controlling the roughness of the first stopper surface to be between 0.6-2.0 μm (higher than conventional smooth surfaces), the mechanism suppresses fragment generation during impact. This parameter change transforms the stopper surface from a smooth, fragment-prone surface to a controlled-roughness surface that absorbs impact energy without shedding debris.
2Object-generated harmful factors
If the stopper surface is made rough to reduce fragment generation, then imaging quality improves, but the surface roughness may affect optical contact
Solution Approach 1:
The patent divides the stopper component into regions with different surface qualities. The first stopper surface (facing the movable portion) has higher roughness (0.6-2.0 μm) to suppress fragments, while the second stopper surface (facing the fixed portion) has lower roughness (0.05-0.5 μm) to ensure precise optical contact and positioning. This local differentiation resolves the contradiction between fragment suppression and contact precision.
Solution Approach 2:
The stopper component's surface is segmented into functionally distinct zones: the first stopper surface for impact absorption and fragment suppression, and the second stopper surface for precise limiting and optical contact. This segmentation allows each zone to be optimized for its specific function without compromising the other.
Data Source
AI summary
An optical driving mechanism is provided, including a movable portion, a fixed portion, a driving component and a first stopper component. The movable portion is configured to connect an optical element. The movable portion is movable relative to the fixed portion. The driving component is configured to drive the movable portion to move relative to the fixed portion. The first stopper component is configured to limit the range of movement of the movable portion relative to the fixed portion.