Segmented Lens Barrel Protrusions for Tilt Prevention
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Solution Overview
Problem
Existing lens units lack a tilt prevention structure, leading to easy tilting of lenses during insertion into the lens barrel, which can cause alignment issues and produce refuse due to scratching and increased friction.
Innovation Solution
A lens unit design featuring a lens barrel with protrusions on its inner circumferential surface that are separated in the optical axis direction, allowing easy insertion and preventing lens tilting by reducing contact area and providing gaps for refuse accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is provided between the lens holder barrel and the first lens, then the lens can be easily inserted into the lens barrel, but the lens can be easily tilted without a tilt prevention structure
Solution Approach 1:
The inner circumferential surface of the lens barrel is segmented into multiple protrusions separated from each other in the optical axis direction. These protrusions create multiple discrete contact points with the lens outer circumferential surface, providing both insertion ease through gaps and tilting prevention through distributed support points.
Solution Approach 2:
The protrusions are positioned at specific locations on the inner circumferential surface to create localized contact regions. This local quality approach ensures that contact occurs at predetermined positions that prevent tilting, while maintaining gaps in other regions for easy insertion.
2Manufacturing precision
If the protrusions are separated from the seating face in the optical axis direction, then refuse can accumulate in the gaps without causing alignment issues, but the lens may tilt more easily
Solution Approach 1:
The gaps between protrusions and the seating face, which could potentially allow tilting, are converted into beneficial refuse accumulation zones. Refuse collects in these gaps rather than between the lens and seating face, preventing alignment issues while the protrusions themselves provide the necessary tilting prevention contact points.
3Stability of the object's composition
If multiple protrusions are used on the inner circumferential surface, then lens tilting is prevented, but the device complexity increases
Solution Approach 1:
The tilting prevention function is achieved through segmentation of the inner circumferential surface into multiple simple protrusions rather than a complex continuous structure. This segmentation provides effective tilting prevention through distributed contact points while maintaining relative structural simplicity.
Solution Approach 2:
The protrusions serve multiple functions simultaneously: they provide tilting prevention through contact with the lens, create gaps for easy insertion, and form refuse accumulation zones. This multi-functionality reduces the need for additional separate structures, thereby limiting the increase in device complexity.
Data Source
AI summary
A lens unit includes: a lens having an optical axis, a lens surface, and an outer circumferential surface; and a lens barrel having an inner circumferential surface and a seating face abutting a periphery of the lens surface, the lens barrel including a plurality of protrusions on the inner circumferential surface, the plurality of protrusions being separated from each other in an optical axis direction and from the seating face in the optical axis direction and abutting the outer circumferential surface.