Lens Barrel Guide Bar Structure for Precise Lens Alignment
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Solution Overview
Problem
Conventional lens barrel designs using screw fastening members increase cost, housing size, and risk lens holding accuracy due to stress, while alternative designs may compromise eccentricity accuracy or lens miniaturization.
Innovation Solution
A lens barrel design featuring first and second fixed lens frames positioned via a guide bar, with contact points for alignment along the optical axis, and a moving lens frame supported by guide bars for precise positioning, minimizing eccentricity and enabling miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screw fastening members are used to fix the lens frame to the housing, then the lens frame can be securely fixed, but the housing size increases and cost increases
Solution Approach 1:
The patent combines the positioning function and fixing function into a single integrated structure. The guide bar serves both to position the lens frame and to fix it in place, eliminating the need for separate screw fastening members. This merging of functions reduces the number of components and minimizes housing size while maintaining secure fixation.
Solution Approach 2:
The patent extracts the screw fastening members from the fixing mechanism and replaces them with a guide bar structure that provides both positioning and fixing functions. By taking out the unnecessary screw components, the housing size is reduced and cost is decreased while the fixing strength is maintained through the integrated guide bar design.
2Strength
If screw fastening members are used to fix the lens frame, then the lens frame can be securely fixed, but the holding accuracy of the lens may change due to stress
Solution Approach 1:
The patent removes the screw fastening members that generate stress during assembly and replaces them with a guide bar structure. This extraction of the stress-generating component eliminates the risk of lens holding accuracy degradation while maintaining secure fixation through the guide bar's integrated positioning and fixing mechanism.
Solution Approach 2:
The guide bar acts as an intermediary structure that provides both positioning and fixing functions without generating stress. Instead of using screws that apply point loads and cause stress concentration, the guide bar distributes the fixing force evenly, preventing deformation of the lens frame and maintaining lens holding accuracy.
3Measurement precision
If a positioning structure between the housing and the fixed lens frame is added, then the lens frame can be positioned accurately, but the eccentricity accuracy of the lens may deteriorate
Solution Approach 1:
The patent merges the positioning structure and fixing structure into a single guide bar component. This integration ensures that the positioning and fixing functions work together harmoniously without creating conflicting forces or misalignments that could lead to lens eccentricity, while still achieving accurate lens frame positioning.
Solution Approach 2:
The guide bar serves multiple functions simultaneously: it positions the lens frame in the optical axis direction, positions it in the direction orthogonal to the optical axis, and fixes it in place. This multi-functionality eliminates the need for separate positioning structures that could compromise lens eccentricity accuracy while maintaining precise positioning.
4Strength
If engagement space between the fixed lens frame and the housing is provided, then the lens frame can be fixed to the housing, but the size of the housing increases
Solution Approach 1:
The patent combines the positioning function and fixing function into the guide bar structure, eliminating the need for separate engagement spaces between the lens frame and housing. The guide bar provides both positioning and fixing capabilities in a compact design, reducing housing size while maintaining secure fixation.
Solution Approach 2:
The guide bar structure is designed to nest within the existing housing and lens frame components, providing fixing and positioning functions without requiring additional engagement spaces. This nesting approach minimizes the housing size while ensuring secure fixation of the lens frame.
Data Source
AI summary
A lens barrel includes a first fixed lens frame that holds a first lens; a second fixed lens frame that holds a second lens; a moving lens frame that moves between the first fixed lens frame and the second fixed lens frame along an optical axis direction of the lens; and a guide bar that supports the moving lens frame so as to be movable along the optical axis direction. The first fixed lens frame and the second fixed lens frame are positioned in a direction orthogonal to the optical axis via the guide bar, and the first fixed lens frame and the second fixed lens frame are positioned in the optical axis direction by a contact portion of the second fixed lens frame coming into contact with the first fixed lens frame.