Interchangeable Lens Mount Asymmetry for Stability
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Solution Overview
Problem
Existing interchangeable lens assemblies are difficult to mount stably on camera bodies due to uneven distribution of bayonet claw portions, leading to instability under external forces and changes in orientation.
Innovation Solution
The solution involves a specific arrangement of bayonet claw portions on both the lens and camera mounts, where the angles between certain claw portions satisfy conditions such as θ1>θ2 and 0.65≤θ1/θ2≤1.35, ensuring balanced and stable mounting by evenly distributing the lock pin groove and claw portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bayonet claw portions are arranged in a conventional configuration, then the mounting structure is simple, but the lens assembly becomes unstable under external forces and orientation changes
Solution Approach 1:
The patent applies asymmetry by configuring bayonet claw portions with specific angular relationships (θ1>θ2 and 0.65≤θ1/θ2≤1.35) rather than symmetric distribution. This asymmetric arrangement creates balanced engagement forces that prevent tilting and improve mounting stability under external forces and orientation changes.
2Reliability
If the lock pin groove and bayonet claw portions are unevenly distributed, then the mounting structure is simpler to manufacture, but the lens assembly experiences tilting and abrasion under external forces
Solution Approach 1:
The patent applies local quality by optimizing the angular distribution of bayonet claw portions and lock pin groove positions at specific locations on the mount portion. The conditions θ1>θ2 and 0.65≤θ1/θ2≤1.35 create locally optimized engagement characteristics that prevent tilting and reduce abrasion, while maintaining manufacturability through precise geometric relationships.
3Reliability
If conventional bayonet coupling is used, then the accessory can be easily attached and detached, but the lens assembly becomes loose and unstable when orientation changes
Solution Approach 1:
The asymmetric angular arrangement of bayonet claw portions maintains the simplicity of bayonet coupling operation while improving stability. The specific angular relationships create balanced force distribution that prevents loosening during orientation changes, without complicating the attachment and detachment process.
Data Source
AI summary
An interchangeable lens assembly includes a plurality of lens-side claw portions configured to be engaged with a plurality of camera-side claw portions, and a lock pin groove portion into which a lock pin is inserted, a lens barrel, and a lens mount fixing member. When θ1 is an angle formed by a line passing through a fifth lens-side end and an optical axis, and a line passing through a center of the lock pin groove portion and the optical axis, and θ2 is an angle formed by a line passing through a fourth lens-side end and the optical axis, and a line that passes through the center of the lock pin groove portion and the optical axis, θ1 and θ2 satisfy a predetermined conditional expression.