Ferrule Structure Recessed Guide Holes
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Solution Overview
Problem
The existing ferrule structures face issues with adhesive adhesion to guide pins during the bonding process of ferrule bodies and lens plates, leading to difficulties in alignment and assembly, particularly due to the risk of adhesive leakage into guide holes.
Innovation Solution
The ferrule structure incorporates recessed parts in the guide holes to prevent adhesive adhesion to guide pins, with specific dimensions and configurations in the body-side and plate-side guide holes to facilitate the alignment and bonding process while minimizing adhesive leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If guide pins are inserted into guide holes for alignment during bonding, then alignment precision is improved, but adhesive may leak into guide holes and adhere to guide pins, making assembly difficult
Solution Approach 1:
The guide hole is segmented into two functional zones: an upper alignment portion and a lower adhesive-containing portion. This segmentation allows the guide hole to simultaneously provide precise alignment functionality while preventing adhesive from reaching and adhering to the guide pin, thus resolving the contradiction between alignment precision and assembly ease
Solution Approach 2:
Different portions of the guide hole are given different qualities: the upper portion maintains a consistent diameter for precise guide pin insertion and alignment, while the lower portion expands to contain excess adhesive. This local quality differentiation ensures that the alignment function is not compromised while preventing adhesive adhesion to the guide pin
2Strength
If adhesive is applied generously to ensure strong bonding, then bonding strength is improved, but adhesive leakage into guide holes increases, causing guide pin adhesion
Solution Approach 1:
The expanded lower portion of the guide hole acts as an intermediary space that captures and contains excess adhesive. This intermediary structure allows generous adhesive application for strong bonding while preventing the adhesive from reaching and adhering to the guide pin, thus maintaining both bonding strength and guide pin removal ease
Solution Approach 2:
The harmful effect of excess adhesive is extracted and isolated in the expanded lower portion of the guide hole, separate from the guide pin insertion path. This extraction allows strong bonding through adequate adhesive application while eliminating the harmful adhesion to guide pins
Data Source
AI summary
A ferrule structure includes: a ferrule body including a body-side guide hole for insertion of a guide pin, and a holding hole that holds light guide members forming light guides; a lens plate including a plate-side guide hole for insertion of the guide pin, and a lens array that includes lenses aligned to the light guides; and a recessed part in an end part of at least one of the body-side guide hole and the plate-side guide hole on an adhesion surface side.