Spectroscopy Module Light Passing Hole and Void Design
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Solution Overview
Problem
Conventional spectroscopy modules face reliability issues due to potential deviations in the relative positional relationship between the incident slit portion and the diode, leading to degraded performance and stray light generation.
Innovation Solution
A spectroscopy module design featuring a light passing hole in the light detecting element and an intermediate substrate with an opening portion to prevent positional deviations and scatter, ensuring precise light detection and reducing stray light by maintaining a void between components, with optional light-blocking properties and resin adhesive application to enhance bonding and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the incident slit portion and the diode are attached to the supporting body in a conventional spectroscopy module, then the module can perform basic light dispersion and detection, but the relative positional relationship between the incident slit portion and the diode may deviate, degrading reliability
Solution Approach 1:
The supporting body is divided into a light incident portion and a light detection portion that are positioned at predetermined locations. This segmentation allows each portion to be independently positioned and fixed, ensuring stable relative positional relationships without requiring high-precision assembly of the entire module.
2Ease of manufacture
If resin adhesive is used to bond the light detecting element to the body portion, then assembly is simplified, but the resin adhesive scatters light and generates stray light, degrading measurement precision
Solution Approach 1:
The light transmission path is extracted from the resin adhesive by forming a void between the light incident portion and the light detecting element. This removes the resin adhesive from the critical light path, eliminating light scattering and stray light generation while maintaining ease of assembly through resin bonding of surrounding structures.
Solution Approach 2:
The space between the light incident portion and light detecting element is specifically designed as a void region with different properties (empty space) compared to the surrounding resin adhesive regions. This local differentiation ensures that light travels through a medium (void) that does not scatter light, while the resin adhesive is used only for structural bonding where it does not interfere with the light path.
3Ease of manufacture
If wiring is provided on the body portion to electrically connect the light detecting element, then electrical connection is achieved, but the cost and complexity of the body portion increases
Solution Approach 1:
An intermediate substrate is introduced as a mediator between the light detecting element and the body portion. The wiring is provided on this intermediate substrate instead of directly on the body portion, simplifying the body portion structure while achieving the required electrical connections through the intermediate layer.
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
The solution improves the reliability and precision of spectroscopic measurements by preventing positional deviations and stray light, while also lowering production costs through strategic wiring placement and material choices.
Implementation Method 1
a light detecting element having a light detecting portion which is disposed on the predetermined plane via an intermediate substrate, the light detecting element having the light detecting portion detects the lights dispersed by the spectroscopic portion
Implementation Method 2
a spectroscopic portion that disperses a light made incident into the body portion from a side of a predetermined plane of the body portion
Data Source
AI summary
In a spectroscopy module 1, a light passing hole 5b through which a light L1 advancing to a spectroscopic portion 4 passes is formed in a light detecting element 5. Therefore, it is possible to prevent the relative positional relationship between the light passing hole 5b and a light detecting portion 5a of the light detecting element 5 from deviating. Moreover, the light to be measured L1 advancing to the spectroscopic portion 4 via the light passing hole 5b and the diffracted lights L2 advancing to the light detecting portion 5a from the spectroscopic portion 4 pass through a void formed between the light detecting element 5 and the substrate 2 by an opening portion 10a of a wiring substrate 10. Therefore, according to the spectroscopy module 1, it is possible to improve the reliability.