Lens Barrel Sheet Member Segmentation for Eccentricity Adjustment
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Solution Overview
Problem
Existing lens barrels face challenges in performing high-accuracy position adjustments of lenses or lens holding frames due to deformation and twisting of thin sheet members during eccentricity adjustments, which adversely affect optical performance.
Innovation Solution
A lens barrel design that incorporates a sheet member with specific low-rigidity regions and notches on the adjustment lens holding frame to prevent twisting during eccentricity adjustments, ensuring accurate clearance and eccentricity adjustments without compromising optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thin sheet member is used for clearance adjustment, then the configuration remains simple, but the sheet member deforms and twists during eccentricity adjustment, adversely affecting optical performance
Solution Approach 1:
The sheet member is divided into multiple regions with different rigidity characteristics. High-rigidity portions maintain structural stability and prevent twisting, while low-rigidity portions allow controlled deformation. This segmentation enables the sheet member to simultaneously achieve simplicity of configuration and reliability of optical performance by strategically placing rigid and flexible zones within the same component.
Solution Approach 2:
Different regions of the sheet member are assigned different rigidity properties to fulfill specific functional requirements. High-rigidity portions are positioned where structural support is needed to prevent twisting, while low-rigidity portions are positioned where controlled deformation is acceptable or beneficial. This local differentiation of material properties resolves the contradiction between simplicity and reliability.
2Manufacturing precision
If multiple position adjustments are performed to achieve high-resolution performance, then lens positioning accuracy is improved, but the adjustment process becomes more complex and time-consuming
Solution Approach 1:
Clearance adjustment and eccentricity adjustment functions are merged into a single integrated adjustment mechanism. The sheet member serves as the common element for both adjustment types, eliminating the need for separate adjustment mechanisms. This merging maintains high positioning accuracy while reducing overall system complexity and adjustment time.
Solution Approach 2:
The sheet member is designed to perform multiple functions: it provides clearance adjustment between lens holding frames and serves as the basis for eccentricity adjustment. This multi-functionality reduces the number of separate components and adjustment mechanisms needed, thereby reducing complexity while maintaining the required manufacturing precision for high-resolution performance.
3Device complexity
If a thin sheet member is used between lens holding frames, then the structure remains simple, but twisting during adjustment causes the adjustment target lens to incline, degrading optical performance
Solution Approach 1:
The sheet member is segmented into high-rigidity and low-rigidity portions that work together to prevent unwanted deformation. The high-rigidity portions are strategically positioned to resist twisting forces that would cause lens inclination, while maintaining overall structural simplicity. This segmentation allows the thin sheet member to remain simple in structure while precisely controlling lens orientation.
Solution Approach 2:
Different regions of the sheet member have different rigidity qualities tailored to their specific functions. High-rigidity portions are placed where twisting must be prevented to maintain lens alignment, while other regions maintain thinness for simplicity. This local quality differentiation enables the structure to be simple overall while providing precise control over lens inclination where required.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
According to an aspect of the present invention, a lens barrel includes a first lens holding frame, a second lens holding frame, and a sheet member configured to be sandwiched between the first lens holding frame and the second lens holding frame, wherein the second lens holding frame is provided with at least two first nip portions, wherein the first lens holding frame is provided with at least two second nip portions, wherein the sheet member is provided with first sheet portions and second sheet portions, and wherein radial widths of the second sheet portions are smaller than radial widths of the first sheet portions.