Lens Driving Device Protrusion Displacement Limit
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Solution Overview
Problem
Current lens driving devices with spring plates face challenges in precision and cost due to the need for high-accuracy components and uneven maximum displacement, which complicates miniaturization and increases costs.
Innovation Solution
The lens driving device incorporates outward first protrusions on the lens holder and inward second protrusions on the spacer, with a predetermined spacing to precisely limit the maximum displacement of the lens holder, reducing the number of high-accuracy components required and eliminating unevenness, while allowing for miniaturization and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the protrusion for limiting maximum displacement is placed on the topmost component (upper casing), then the device structure is simple, but the stacking accuracy requirement increases and uneven maximum displacement occurs
Solution Approach 1:
The patent inverts the conventional placement of the displacement-limiting protrusion from the topmost component (upper casing) to the bottommost component (base). This inversion allows the protrusion to engage with a corresponding feature on the lens holder during assembly, automatically limiting the maximum displacement of the lens holder without requiring high-precision stacking of multiple components. The base serves as the reference datum, eliminating accumulation of dimensional tolerances.
2Manufacturing precision
If high-accuracy components are used to control maximum displacement, then the displacement precision is improved, but the device cost increases
Solution Approach 1:
The patent employs a simple protrusion structure formed directly on the base (a low-cost component) to limit maximum displacement, replacing the need for expensive high-precision components or complex adjustment mechanisms. The protrusion and its corresponding engagement feature on the lens holder form a mechanical stop that is easy to manufacture and effective in controlling displacement without requiring tight tolerances on multiple components.
3Manufacturing precision
If multiple high-accuracy components are stacked to achieve precise displacement control, then the displacement precision is improved, but the device size increases
Solution Approach 1:
The patent merges the displacement-limiting function into the base structure itself through the protrusion feature, rather than requiring separate limiting components or complex stacking arrangements. The protrusion on the base works in conjunction with the lens holder to define the maximum displacement, eliminating the need for additional spacing components or adjustment mechanisms, thereby reducing the overall device volume while maintaining precise displacement control.
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
This configuration enables precise control of the maximum displacement of the lens holder, reduces the need for high-accuracy components, and minimizes costs, while maintaining device performance and allowing for miniaturization and weight reduction.
Implementation Method 1
spring plates elastically supporting a lens holder holding object lenses on a base
Implementation Method 2
the driving coil 53 will generate a Lorentz force in a direction toward an imaged object (up-and-down direction)
Data Source
AI summary
A lens driving device is provided to reduce a number of required high-accuracy components and also eliminate the unevenness of maximum displacement of a lens holder with respect to a base. An outer edge of a lower spring plate is clamped by a lower casing served as a base and a lower spacer. A first protrusion is formed on a sidewall of the lens holder and protruding outward therefrom. A second protrusion protruding toward the lens holder is formed on an inner circumference of the lower spacer and extends to a position above and separating from the first protrusion by a distance S. The first protrusion props against the second protrusion when the lens holder is moved toward an imaged-object side and reaching a displacement of the distance S.