Lens Array Adhesive Layout to Prevent Optical Module Inclination
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Solution Overview
Problem
In optical communication devices, the integration of a lens array with multiple lens elements arranged in parallel often results in inclination issues when fixed to a base, leading to uneven optical coupling efficiency due to the increased length of the lens array in the horizontal direction, causing misalignment of lens elements with respect to the optical axis.
Innovation Solution
The optical module incorporates a lens array with multiple adhesive surfaces and an interference suppression portion between them, which are fixed to a flat base using multiple adhesive layers, ensuring the lens array remains parallel to the base and maintains precise alignment of lens elements with the optical axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lens array is simply fixed to the two pedestals with adhesive and the pedestals are fixed to the base, then the number of components increases, but the lens array becomes compact and the inclination is suppressed
Solution Approach 1:
The patent merges the lens array fixing function directly to the base by providing adhesive surfaces on the lens array that contact the base, eliminating the need for separate pedestals. This combining of functions reduces component count while maintaining the anti-inclination effect through direct adhesive bonding between the lens array and base.
Solution Approach 2:
The patent extracts and eliminates the intermediate pedestals from the fixing structure. By directly providing adhesive surfaces on the lens array that bond to the base, the design removes the unnecessary intermediate components while achieving the same structural support and inclination suppression functions.
2Volume of moving object
If the lens array is made compact with lens elements arranged in parallel, then the horizontal length becomes longer than the height, but the inclination with respect to the horizontal direction increases
Solution Approach 1:
The patent addresses the inclination problem by introducing a new dimension of adhesive bonding surfaces on the lens array that extend in the horizontal direction. These adhesive surfaces create a broader bonding area parallel to the base, providing rotational stability and preventing the lens array from inclining, thus solving the stability issue while maintaining the compact parallel arrangement of lens elements.
3Manufacturing precision
If the lens array is inclined with respect to the horizontal direction, then the lens elements are precisely aligned, but the core shifts in the height direction with respect to the optical axis
Solution Approach 1:
The patent provides adhesive surfaces on the lens array that contact the base beforehand, creating a stable bonding structure that prevents inclination before optical alignment is performed. This pre-stabilization ensures that the lens elements remain precisely aligned with their corresponding optical axes during operation, maintaining high coupling efficiency without requiring post-alignment adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses the inclination of the lens array, ensuring consistent and efficient optical coupling between the semiconductor light emitter and receiver, maintaining high coupling efficiency across all lens elements.
Implementation Method 1
a plurality of adhesive layers is provided which glues the respective plurality of adhesive surfaces of the lens array to the flat surface of the base and thereby fixes the lens array to the flat surface of the base
Data Source
AI summary
A lens array includes, on a surface which belongs to the lens array and which faces a flat surface of a base, a plurality of adhesive surfaces located side by side in a direction in which a plurality of lens elements is arranged in parallel, and includes an interference suppression portion for an adhesive between adjacent adhesive surfaces among the plurality of adhesive surfaces, and a plurality of adhesive layers is provided which glues the plurality of adhesive surfaces of the lens array to the flat surface of the base and thereby fixes the lens array to the flat surface of the base.