Optical Module Lens Bonding for Positional Deviation Control
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Solution Overview
Problem
Existing optical module bonding and fixing methods face challenges in achieving high coupling efficiency due to positional deviations of lenses caused by adhesive resin curing shrinkage and changes over time, leading to increased complexity and cost in the process and mechanism for positional adjustments.
Innovation Solution
The optical module incorporates a first and second lens aligned in the optical axis direction, with each lens fixed via an adhesive resin on a base member, where the bonding directions of the lenses are perpendicular to the optical axis, allowing for reduced positional deviations and simplified mounting structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a lens is fixed by an adhesive resin, then the lens can be mounted on the base member, but the volume of resin changes due to curing shrinkage and change over time, causing positional deviation and deterioration of coupling efficiency
Solution Approach 1:
The lens is mounted on the base member in advance before final positioning adjustments are made. The adhesive resin is applied and the lens is temporarily fixed, allowing subsequent adjustment mechanisms to correct positional deviations caused by resin shrinkage without requiring remounting of the lens.
Solution Approach 2:
An adjustment mechanism serves as an intermediary between the adhesive-resin-fixed lens and the optical components. This mediator allows for positional corrections of the lens after the adhesive has set, compensating for shrinkage effects while maintaining the simplicity of adhesive-based mounting.
2Manufacturing precision
If process and mechanism for positional adjustment between the lens and the bases are complicated, then positional accuracy can be improved, but the implementing cost is increased
Solution Approach 1:
The adjustment mechanism utilizes changes in physical parameters such as thermal expansion coefficients or moisture absorption characteristics of adjustment elements to enable simple positional corrections. By leveraging natural parameter changes in materials rather than complex mechanical adjustments, the system achieves high positioning accuracy with minimal mechanism complexity.
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 deterioration of coupling efficiency, achieving high coupling efficiency with a simpler lens mounting structure and reducing the loss of incident light intensity.
Implementation Method 1
each of the first lens and the second lens is fixed via an adhesive resin
Data Source
AI summary
An optical module includes: a first lens and a second lens provided between a light emitter and a light receiver; and a base member on which the light emitter and the light receiver are placed, and each of the first lens and the second lens is fixed via an adhesive resin. A first bonding direction in which a first bonding surface of the first lens is bonded and fixed via an adhesive resin, and a second bonding direction in which a second bonding surface of the second lens is bonded and fixed via an adhesive resin are respectively perpendicular to an optical axis direction of light, and an orientation of the first bonding surface and an orientation of the second bonding surface make are different from each other.