Asymmetric Lens Mount Layout for Stable Interchangeable Lens Locking
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Solution Overview
Problem
Existing camera systems face challenges in maintaining a stable mount of interchangeable lenses due to uneven dispositional relationships between bayonet claw portions, leading to instability under external forces and orientation changes.
Innovation Solution
The design of a lens mount with specifically angled bayonet claw portions and a lock pin mechanism that ensures a balanced and secure attachment to the camera body, utilizing a lock pin groove and biasing members to maintain stability across various orientations and forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bayonet claw portions are positioned near the lock pin groove portion, then the lens assembly can be securely locked to the camera body, but the dispositional relationship between the bayonet claw portions and the lock pin groove portion differs greatly, leading to instability under external forces
Solution Approach 1:
The patent applies asymmetry by intentionally designing unequal angular relationships between the bayonet claw portions and the lock pin groove portion. Specifically, the first bayonet claw portion is positioned at a first angle from the lock pin groove portion, while the second bayonet claw portion is positioned at a second angle that is deliberately different from the first angle. This asymmetric arrangement creates a balanced force distribution that prevents tilting and enhances mounting stability under external forces.
2Reliability
If the lock pin is inserted into the lock pin groove portion to secure the lens assembly, then the lens can be firmly attached, but the lens assembly becomes difficult to remove without retracting the lock pin
Solution Approach 1:
The patent applies dynamics by designing the lock pin as a movable component that can transition between extended and retracted positions. The lock pin is biased by a spring mechanism, allowing it to automatically extend to secure the lens assembly during mounting, and can be manually retracted to enable easy removal. This dynamic design provides both secure attachment during use and convenient removal when needed.
3Ease of operation
If the bayonet claw portions are positioned to allow easy insertion and rotation, then the lens assembly can be quickly mounted, but the dispositional relationship creates instability when external forces or orientation changes are applied
Solution Approach 1:
The patent resolves this contradiction by using asymmetric positioning of the bayonet claw portions relative to the lock pin groove portion. The unequal angular relationships (first angle and second angle) create a force-balanced configuration that maintains stability under external forces while still allowing easy insertion and rotation during the mounting process.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A lens mount (101) includes a plurality of lens-side claw portions (107a, 107b, 107c) and a lock pin concave portion (102) wherein, the internal angles of a quadrangle formed by connecting a center of a first lens-side claw portion (107a), a center of a second lens-side claw portion (107b), a center of a third lens-side claw portion (107c), and a center of the lock pin concave portion (102) satisfy predetermined conditions, and corresponding lens apparatus, accessory, camera mount, image pickup apparatus and camera system.