Optical Lens Fixing Ring Structure to Prevent Decentering
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Solution Overview
Problem
Optical imaging lenses face issues with deformation and decentering due to glue shrinkage during curing, affecting optical quality and assembly stability, while reducing the lens element's outer diameter complicates fitting and manufacturability.
Innovation Solution
An optical lens design with a lens barrel, first lens element, and optical element featuring a fixing portion and bearing portion connected to each other, where the fixing portion has a protrusion extending towards the first lens element, increasing contact area with the barrel and maintaining a gap with the lens element group to prevent decentering during glue curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens element outer diameter is reduced to avoid direct contact with the lens barrel, then the influence of lens barrel deformation on lens element is reduced, but the fitting and combination stability with adjacent elements deteriorates
Solution Approach 1:
The patent introduces an optical element (fixing ring) as an intermediary component between the lens barrel and the lens element group. This fixing ring has a fixing portion that contacts the lens barrel and a bearing portion that contacts the lens element group, mediating the connection and avoiding direct contact between the lens barrel and lens elements, thus preventing deformation transmission while maintaining assembly stability
Solution Approach 2:
The fixing ring is segmented into distinct functional portions: a fixing portion for contacting the lens barrel, a bearing portion for contacting the lens element group, and a protrusion for radial positioning. This segmentation allows each portion to independently perform its specific function, optimizing both the avoidance of lens barrel influence and the maintenance of assembly stability
2Ease of manufacture
If glue is dispensed on the lens barrel for assembly, then the assembly process is simplified, but the glue shrinkage during curing causes lens barrel deformation and lens element decentering
Solution Approach 1:
The fixing ring serves as a protective intermediary between the glue-dispensed lens barrel and the lens element group. The bearing portion of the fixing ring contacts the lens element group, isolating it from the deforming lens barrel, while still allowing the simplified glue dispensing process on the lens barrel to be used
Solution Approach 2:
The fixing ring is pre-installed on the lens barrel before the lens element group is assembled. This beforehand installation creates a protective buffer structure that anticipates and prevents the harmful effects of glue shrinkage before the lens elements are in place, cushioning against potential decentering
Data Source
AI summary
An optical lens has an optical axis. The optical lens includes a lens barrel, a first lens element, a lens element group, and an optical element. The lens barrel has a first opening and a second opening opposite to each other, and the first opening is smaller than the second opening. The first lens element abuts against the lens barrel. The lens element group is fitted with the first lens element. The optical element includes a fixing portion and a bearing portion connected to each other. The fixing portion abuts against the lens barrel, the bearing portion abuts against the lens element group, and the fixing portion has a protrusion extending toward a direction of the first lens element. The protrusion is positioned between the lens barrel and the lens element group in a radial direction.