Lens Apparatus Eccentric Shaft Adjustment Mechanism
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Solution Overview
Problem
Existing lens apparatuses face challenges in achieving high accuracy and stability during adjustments due to dimension errors and limited precision, leading to potential misalignment and poor optical performance, especially when adjustments are made without precision tools, and existing adjustment mechanisms are cumbersome or prone to inclination and shock-induced deformation.
Innovation Solution
A lens apparatus with a position adjustment mechanism featuring a movable barrel and an eccentric shaft part that rotates relative to a fixed barrel, allowing for precise optical axis adjustments via a rotation-straight movement converting mechanism, with a compact adjustment operating part and enhanced resistance to static pressure and shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a ring operation member arranged on the outer circumference of the lens apparatus is coupled with a rotation-straight movement converting mechanism, then the flange back can be adjusted by rotating the ring operation member, but the adjustment operating part extends around the whole outer circumference making it difficult to cover with a cover member, increasing device complexity and reducing ease of operation
Solution Approach 1:
The adjustment mechanism is segmented into a compact configuration where the operating part is divided into an operating portion and a separate cover portion. The cover can be detached to allow adjustment operations and then reattached to cover the operating parts, simplifying the overall structure while maintaining adjustment functionality.
2Reliability
If the adjustment operating part is covered with a cover member to prevent operation errors, then reliability improves, but the robustness necessary for attachment strength makes the structure complicated and reduces ease of operation
Solution Approach 1:
The cover is designed as a dynamic component that can be easily attached and detached. The operating part includes both an operating portion and a cover portion that can be separated, allowing the cover to be removed only when adjustment is needed and providing easy access to the adjustment mechanism.
3Device complexity
If a movable lens unit is driven by only a pin located in a single place, then the structure is simple, but a change in the inclination of the movable lens unit occurs, degrading optical performance
Solution Approach 1:
The operating part merges multiple functional elements including the operating portion and cover portion into a unified structure. The cover portion integrates with the operating part to form a compact assembly that maintains lens unit stability while preserving structural simplicity.
4Strength
If a static pressure or shock in the optical axis direction is applied to the movable lens unit, then the load is received by only a single portion, causing deformation or damage to components
Solution Approach 1:
The cover portion serves as a protective element that can be attached beforehand to shield the adjustment mechanism and lens unit from external impacts and static pressures, preventing deformation or damage to internal components.
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
The solution enables precise and stable optical axis adjustments, conserving space and improving resistance to static pressure and shock, thus enhancing the overall optical performance and operability of the lens apparatus.
Implementation Method 1
The operating part includes an eccentric shaft part that has a center axis different from the rotation axis of the operating part and protrudes to the inner diameter side, the eccentric shaft part is engaged with a straight groove provided on an outer circumference of the movable barrel and in parallel with the optical axis, and rotation of the operating part about the rotation axis rotates the movable barrel about the optical axis via the eccentric shaft part
Data Source
AI summary
A lens apparatus includes: a movable barrel arranged in a fixed barrel and holding an optical element; a converter that moves the optical element in an optical axis direction by rotating the movable barrel to the fixed barrel about an optical axis; and an operating part supported to the fixed barrel rotatably about an axis perpendicular to the optical axis, and arranged such that the operating part is rotated from outside of the fixed barrel. The operating part includes an eccentric shaft having an axis different from the rotation axis of the operating part and protruding to the inner diameter side, the eccentric shaft engages with a straight groove provided on the movable barrel and in parallel with the optical axis, and rotation of the operating part rotates the movable barrel about the optical axis via the eccentric shaft to move the optical element in the optical axis direction.