Lens Barrel Sub Aperture Stop Mechanism
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Solution Overview
Problem
Existing lens barrels with special optical characteristics, such as ultra-wide-angle lenses, require multiple sub aperture stops to correct fully-opened stop aperture diameters and prevent significant marginal light changes during zoom operations, but prior art fails to provide a cost-effective configuration with independently adjustable sub aperture stops and different fully-opened diameters.
Innovation Solution
A lens barrel design incorporating a main aperture stop and at least two sub aperture stops, each with a rotating driving member and cam portions engaging with a cam barrel, allowing independent adjustment of sub aperture stop diameters without increasing the number of parts or cost, using a cam barrel that rotates to drive the stop blades in the open and close direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sub aperture stops are added to correct fully-opened stop aperture diameter and prevent marginal light changes, then optical performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple sub aperture stops (first sub aperture stop and second sub aperture stop) into a single integrated assembly where both stops share common structural elements, mounting mechanisms, and adjustment systems. This merging approach allows the lens barrel to achieve the optical performance benefits of multiple stops while reducing the overall number of discrete parts and simplifying manufacturing compared to completely separate stop assemblies.
2Adaptability or versatility
If each sub aperture stop has independent adjustment capability, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal adjustment mechanism where a single adjustment member can control both the first sub aperture stop and the second sub aperture stop. This multi-functional design allows independent adjustment of each stop's aperture diameter through a unified control system, providing adaptability for different optical conditions while avoiding the complexity of completely separate adjustment mechanisms for each stop.
Solution Approach 2:
The patent enables dynamic adjustment of sub aperture stop diameters during operation, allowing the lens barrel to adapt to different focal lengths and shooting conditions. The adjustment mechanism permits real-time modification of aperture settings while maintaining a relatively simple structural configuration, achieving both adaptability and structural efficiency.
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
Enables separate adjustment of sub aperture stop diameters within specific ranges, optimizing light control and preventing marginal light changes during zoom operations, while maintaining cost-effectiveness and reducing part complexity.
Implementation Method 1
a cam barrel including a first cam portion engaging with a first engagement portion provided to the first driving member and a second cam portion engaging with a second engagement portion provided to the second driving member. The cam barrel is rotatable about the optical axis to rotate the first and second driving members.
Data Source
AI summary
The lens barrel includes a main aperture stop, a first sub aperture stop including a first stop blade and a first driving member rotatable about an optical axis to drive the first stop blade in its open and close direction, a second sub aperture stop including a second stop blade and a second driving member rotatable about the optical axis to drive the second stop blade in its open and close direction, and a cam barrel including a first cam portion engaging with a first engagement portion provided to the first driving member and a second cam portion engaging with a second engagement portion provided to the second driving member. The cam barrel is rotatable about the optical axis to rotate the first and second driving members.