Lens Barrel Mount Ring Alignment via Positioning Ring
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Solution Overview
Problem
Existing lens devices require re-alignment of the optical axis of the lens barrel and the central axis of the mount ring whenever the mount ring is replaced, making the process cumbersome and requiring high processing accuracy.
Innovation Solution
A lens device design featuring a lens barrel with pins and through holes, a positioning ring with a smaller outer diameter than the holes, and a fixing member that secures the positioning ring inside the holes, allowing the pins to position the mount ring relative to the lens barrel without re-alignment, using a bayonet structure for attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixing pin and pin hole are used to position the lens barrel and mount ring, then the alignment between optical axis and central axis can be achieved, but high processing accuracy is required
Solution Approach 1:
The positioning ring is pre-installed on the lens barrel with pins protruding from it. This preliminary positioning structure allows the mount ring to be aligned with the lens barrel's optical axis before final attachment, eliminating the need for high-precision processing of fixing pins and pin holes. The pins extend from the positioning ring to directly engage with the mount ring, establishing alignment in advance.
Solution Approach 2:
The positioning ring acts as an intermediary component between the lens barrel and the mount ring. It provides a reference structure with pins that mediate the alignment process, allowing the mount ring to be positioned relative to the lens barrel's optical axis without requiring direct high-precision machining between the two main components.
2Adaptability or versatility
If the mount ring is replaced when the camera body is replaced, then adaptability to different camera bodies is achieved, but re-alignment work becomes cumbersome
Solution Approach 1:
The positioning ring with its pins is pre-installed on the lens barrel, creating a reusable alignment reference. When the mount ring is replaced for different camera bodies, the pins from the pre-installed positioning ring automatically guide the new mount ring into correct alignment with the optical axis, eliminating the need for time-consuming re-alignment work.
Solution Approach 2:
The positioning ring serves multiple functions: it provides alignment reference for different mount rings, maintains optical axis positioning, and enables quick replacement of mount rings for different camera bodies. This multi-functional design allows the same positioning structure to work with various mount ring configurations without requiring re-alignment.
Data Source
AI summary
A camera-attached lens device includes a lens barrel, a mount ring, pins, through holes, a positioning ring, and a fixing member. The lens barrel holds a lens system. The mount ring, attached to the lens barrel, has a tubular fitted portion coupling with the camera and a flange portion around the fitted portion. The pins are on the lens barrel and position a central axis of the mount ring with respect to an optical axis. The through holes are on the flange portion. The positioning ring outer diameter is smaller than a hole diameter of the through holes and has an opening where the pins are fitted. The fixing member fixes the positioning ring inside the through holes. The pins are restricted by the opening of the positioning ring fixed by the fixing member when the mount ring is positioned, positioning the lens barrel with respect to the mount ring.