Lens Barrel Filter Seating Structure for Adhesive Flow Control
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Solution Overview
Problem
The application of adhesive in a liquid state between the lens barrel and filter can lead to performance deterioration of the lens assembly due to adhesive flow to unintended regions.
Innovation Solution
A lens barrel design with a seating portion, step portion, and avoidance grooves or separation spaces, along with adhesive inlets, controls adhesive application to ensure it is confined to the required regions, preventing flow and enhancing bonding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied in liquid state between lens barrel and filter, then bonding between components is achieved, but adhesive flows to unintended regions causing performance deterioration
Solution Approach 1:
The patent introduces an avoidance groove with specific geometric features (concave shape in optical axis direction, inclined surfaces) at the local region where adhesive application occurs. This local structural modification creates a physical barrier that confines adhesive to desired areas while maintaining bonding function, resolving the contradiction between achieving strong bonding and preventing adhesive leakage.
Solution Approach 2:
The avoidance groove acts as an intermediary structure between the lens barrel and filter. It provides a controlled path for adhesive flow and a stopping point (via the concave shape and inclined surfaces) that prevents adhesive from reaching regions that would deteriorate lens assembly performance, thus mediating between bonding requirements and performance preservation.
2Reliability
If adhesive is applied generously to ensure complete bonding, then bonding reliability is improved, but adhesive flow to unintended regions increases
Solution Approach 1:
The avoidance groove is designed in advance (preliminarily) to counteract the harmful effect of adhesive flow. The concave shape and inclined surfaces create a predetermined barrier that stops adhesive flow before it can reach unintended regions, allowing generous adhesive application without the harmful effects of leakage.
Solution Approach 2:
The patent converts the potential harm of adhesive flow into a benefit by designing the avoidance groove to channel and contain the flowing adhesive. The adhesive's natural flow tendency is redirected into the concave groove and stopped at the inclined surfaces, transforming what would be a harmful leakage into a controlled bonding process.
Data Source
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AI summary
A lens assembly includes a lens barrel, a lens disposed on the lens barrel, and a filter configured to filter light passing through the lens, wherein the lens barrel includes a seating portion in which the filter is disposed, and a step portion disposed facing the filter between the seating portion and an optical axis, wherein an avoidance groove formed to be concave in an optical axis direction is disposed on an upper surface of the seating portion.