Fabry-Perot Filter Light Detector Miniaturization
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Solution Overview
Problem
The miniaturization of light-detecting devices is hindered by the need to position bonding pads outside the Fabry-Perot interference filter, which increases the device's size.
Innovation Solution
A light-detecting device design that includes a wiring substrate with a support member surrounding the Fabry-Perot interference filter, featuring openings that allow wiring lines to pass through, enabling bonding pads to be placed within the surrounding region, thus eliminating the need for external placement and allowing the device to be miniaturized to the size of the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding pads are disposed outside the Fabry-Perot interference filter, then electric connection is secured, but the device size increases
Solution Approach 1:
The patent applies dimensionality change by moving bonding pads from the two-dimensional plane outside the filter to the third dimension through openings in the support member. This allows bonding pads to be positioned both within the surrounding region (reducing device size) and maintain electrical connection (securing reliability) by passing through the support member structure vertically.
Solution Approach 2:
The patent implements nesting by placing bonding pads within the surrounding region formed by the support member, rather than outside it. The bonding pads are nested inside the structural boundary of the support member, allowing the device footprint to be minimized to match the filter size while maintaining all necessary electrical connections.
2Area of stationary object
If bonding pads are placed within the surrounding region, then device size is minimized, but wiring connection becomes complex
Solution Approach 1:
The support member is segmented with openings that separate different functional regions. These openings provide dedicated pathways for wiring lines to access bonding pads without crossing other structural elements, simplifying the wiring routing process despite the compact layout.
Solution Approach 2:
The openings in the support member act as intermediaries that facilitate the connection between wiring lines and bonding pads. Rather than requiring complex routing around the entire support member structure, the openings provide direct access points that simplify the wiring path.
3Strength
If support member surrounds the Fabry-Perot interference filter, then structural support is provided, but resin material may enter the light transmission region
Solution Approach 1:
The support member is divided into segments with openings between them, creating a segmented structure that provides mechanical support while preventing continuous resin flow into the light transmission region. The gaps act as barriers to resin material while maintaining structural integrity.
Solution Approach 2:
The support member has different properties in different regions: solid portions provide structural support, while openings provide contamination protection. This local differentiation of structure and function allows the same component to simultaneously provide mechanical strength and prevent resin intrusion.
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 secures electric connection to the light detector, improves wire bonding workability, and prevents resin material from entering the light transmission region, resulting in a compact and functional light-detecting device.
Implementation Method 1
a Fabry-Perot interference filter which has a light transmission region and is disposed on the principal surface of the wiring substrate with the support member therebetween
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
A spectral sensor 1 includes a wiring substrate 2 which has a principal surface; a light detector 3 which is disposed on the principal surface 2A of the wiring substrate 2 and is electrically connected to the wiring substrate 2; spacer 4 which is disposed around the light detector 3, on the principal surface 2A of the wiring substrate 2; and a Fabry-Perot interference filter 10 which has a light transmission region 11 and is disposed on the principal surface 2A of the wiring substrate 2 with the spacer 4 therebetween. The spacer 4 support the Fabry-Perot interference filter 10 in a surrounding region R1 of the light transmission region 11 and the spacer 4 has opening A1 communicating with an inner side of the surrounding region R1 and an outer side of the surrounding region R1, when viewed from a light transmission direction in the light transmission region 11.