Lens Barrel Eccentricity Adjustment via Through-Hole Jig Access
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Solution Overview
Problem
Existing lens barrels are unable to facilitate eccentricity adjustment of lenses attached to inner lens frames among a plurality of lens frames disposed in the optical axis direction.
Innovation Solution
A lens barrel design that includes a cylindrical first lens frame, a second lens frame, a third lens frame, an insertion hole, and a joint, allowing for eccentricity adjustment of the third lens frame by inserting a jig through the insertion hole and fixing it to the first lens frame using the joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional lens adjusting mechanism is used for two lens holding members, then eccentricity adjustment is achieved between those two members, but it cannot be applied to eccentricity adjustment of inner lens frames among a plurality of lens frames
Solution Approach 1:
The adjustment mechanism is designed to be universally applicable to any lens frame within the plurality of lens frames. The through-hole structure allows adjustment of inner lens frames without requiring different mechanisms for different positions, making the same structural approach work for multiple lens frames throughout the optical system.
Solution Approach 2:
The inner lens frame is positioned within the outer lens frame structure, with the through-hole passing through the outer lens frame to access the inner lens frame. This nested arrangement allows the adjustment mechanism to reach inner components through outer components without increasing overall structural complexity.
2Manufacturing precision
If adjustment access is provided for inner lens frames, then optical axis adjustment capability is improved, but structural complexity increases
Solution Approach 1:
The adjustment function is extracted and concentrated into a simple through-hole structure that passes through the outer lens frame. This extracted approach provides adjustment access without adding complex mechanisms, keeping the overall structure simple while achieving precise optical axis adjustment capability.
Solution Approach 2:
The outer lens frame acts as an intermediary structure that contains the through-hole, allowing adjustment tools to access the inner lens frame. This intermediary approach enables precise adjustment of inner components while maintaining the integrity and simplicity of the overall lens frame structure.
Data Source
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AI summary
Lens barrel (10) includes first group lens frame unit (11), second group lens frame unit (12), lens frame (16), insertion hole (11c), and depressions (11ab, 16ca). First group lens frame unit (11) holds lenses (L1 to L3). Second group lens frame unit (12) holds lens (L5). Lens frame (16) is disposed between first group lens frame unit (11) and second group lens frame unit (12) on an inner circumference side of first group lens frame unit (11) through radial clearance (G). Insertion hole (11c) is provided on an outer peripheral surface of first group lens frame unit (11), and a jig of lens frame (16) is inserted into insertion hole (11c). Depressions (11ab, 16ca) are provided at a position accessible from an outside in a state where first group, second group lens frame units (11), (12) and lens frame (16) are assembled, and fix lens frame (16) to first group lens frame unit (11).