Lens Mount with Segmented Outer Diameter for Attachment Workability
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Solution Overview
Problem
Existing lens mounts for interchangeable lens cameras generate a moment around the lens mount due to the offset center of gravity of the optical apparatus, leading to increased complexity and difficulty in attaching and detaching lenses.
Innovation Solution
A lens mount design featuring an outer diameter portion with a first region and a second region closer to the object side, incorporating cutout portions along the circumferential direction in the first region to reduce the fitting circumferential length and improve attachment workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lens mount uses a conventional bayonet structure with full circumferential contact, then the connection strength between lens apparatus and camera is improved, but the attachment operation becomes difficult due to generated moment and increased rubbing
Solution Approach 1:
The lens mount divides the outer diameter portion into multiple regions along the circumferential direction, with cutout portions creating distinct first and second regions. This segmentation reduces the continuous fitting circumferential length while maintaining connection strength through strategic contact zones, thereby easing the attachment operation by reducing rubbing during insertion.
Solution Approach 2:
The lens mount applies different properties to different regions of the outer diameter portion. The first region has a reduced fitting circumferential length with cutout portions to facilitate easier attachment, while the second region maintains adequate contact for connection strength. This local differentiation resolves the contradiction between ease of operation and connection strength.
2Manufacturing precision
If the lens mount increases the fitting circumferential length to reduce inclination, then the attachment precision is improved, but the attachment operation becomes more difficult due to increased rubbing
Solution Approach 1:
By segmenting the outer diameter portion into regions with and without cutout portions, the lens mount achieves inclination regulation through the second region while the first region provides easier attachment with reduced rubbing. The segmented structure allows precision and ease of operation to coexist.
Solution Approach 2:
The lens mount applies partial action by providing cutout portions only in the first region rather than uniformly across the entire circumference. This partial reduction in fitting circumferential length suffices to ease attachment operation while the second region maintains adequate contact for preventing inclination, resolving the contradiction between precision and ease of operation.
3Ease of operation
If the lens mount reduces the fitting circumferential length to ease attachment, then the attachment operation is improved, but the connection strength is reduced
Solution Approach 1:
The lens mount segments the outer diameter portion into a first region with reduced fitting circumferential length for ease of attachment, and a second region with adequate contact for connection strength. This segmentation allows both ease of operation and connection strength to be satisfied simultaneously.
Solution Approach 2:
Different regions of the lens mount are given different qualities: the first region has cutout portions for easier attachment, while the second region maintains sufficient fitting circumferential length for connection strength. This local quality differentiation resolves the contradiction between ease of operation and connection strength.
Data Source
AI summary
A lens mount attachable to and detachable from a camera mount, the lens mount comprises an outer diameter portion fitted to an inner diameter portion of the camera mount. The outer diameter portion includes a first region and a second region located closer to an object side than the first region. A length in a circumferential direction of a first fitting portion fitted to the inner diameter portion in the second region is longer than a length in the circumferential direction of a second fitting portion fitted to the inner diameter portion in the first region.