Camera Accessory Mount Backlash Reduction via Segmented Tabs
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Solution Overview
Problem
Existing camera accessory mount systems with bayonet structures struggle to completely prevent backlash between the camera accessory and the camera body due to the positioning of the restricting portion near the retainer lock groove.
Innovation Solution
The camera accessory features an accessory mount with a bayonet structure that includes first, second, and third tabs, a restricting member, a fitting portion, and a lock pin hole, allowing for correct interlock phase insertion without hindrance from camera body-side tabs, and restricting rotation ranges through contact with specific tab ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the restricting portion is positioned near the retainer lock groove, then the rotation range can be restricted during mounting and dismounting, but backlash between the camera accessory and camera body cannot be completely prevented
Solution Approach 1:
The restricting portion is divided into multiple restricting protrusions distributed around the circumference, each interacting with corresponding restricting grooves on the camera body. This segmentation allows the rotation range to be restricted while distributing the engagement points to better control backlash through multiple contact locations rather than a single point near the lock groove.
Solution Approach 2:
The restricting portion extends not only radially but also circumferentially with multiple protrusions at different angular positions. This multi-dimensional arrangement creates multiple engagement points that simultaneously restrict rotation and address backlash from different spatial dimensions, rather than relying on a single point restriction.
2Reliability
If three tabs are set over intervals in a circumferential direction, then erroneous insertion can be prevented, but the structure becomes more complex
Solution Approach 1:
The three tabs are positioned at unequal angular intervals rather than equal intervals, creating an asymmetric pattern. This asymmetric arrangement with specific angular positions (e.g., 0°, 120°, 240°) provides effective erroneous insertion prevention while maintaining a relatively simple tab structure that is easier to manufacture compared to more complex multi-element mechanisms.
Data Source
AI summary
An accessory mount can be inserted through the camera body mount without any of the first through third tabs being hindered by any of three camera body-side tabs at the camera body mount, as long as the accessory mount is inserted into the camera body mount at a correct interlock phase. The first, second, and third tabs extend over varying lengths along the circumferential direction. The first tab extends over a greatest length and the third tab extends over a smallest length, along the circumferential direction. The accessory mount includes a restricting member, a fitting portion, and a lock pin hole. The restricting member is disposed at a position assumed on a side substantially opposite from the lock pin hole across the fitting portion.