Pyroelectric Detector Plug Wiring for Thermal Isolation
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Solution Overview
Problem
Pyroelectric type infrared detectors face challenges in electrical stability and integration due to complex wiring structures, which can lead to damage and short-circuiting, and require increased surface area for electrode connections, compromising thermal isolation and detection sensitivity.
Innovation Solution
A pyroelectric detector design featuring a substrate, support member, and spacer member with insulating and wiring layers, including a first plug to connect the wiring with the electrode, and a metal oxide layer for thermal isolation, allowing for compact integration and protection of wiring, ensuring electrical stability and thermal isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring structure is made complex to ensure electrical connection, then electrical stability is improved, but device complexity increases and surface area expands
Solution Approach 1:
The plug structure is embedded within the support member body, nesting the wiring connection function inside the structural component. This eliminates the need for separate external wiring structures and reduces overall device complexity while maintaining electrical stability.
Solution Approach 2:
The support member integrates multiple functions: structural support, thermal isolation, and wiring connection. By merging the wiring function into the support member structure, the patent reduces the number of separate components and simplifies the overall device architecture.
2Reliability
If contact region for wiring connection is enlarged, then electrical stability is improved, but surface area increases compromising thermal isolation
Solution Approach 1:
The wiring connection is nested within the support member's thickness rather than expanding on the surface. The plug extends through the support member from the rear surface, allowing electrical connection without increasing the front surface area that would compromise thermal isolation.
Solution Approach 2:
The wiring connection transitions from a surface-level problem to a three-dimensional solution. Instead of enlarging the contact region on the front surface, the plug utilizes the vertical dimension by extending through the support member's thickness, achieving electrical connection without increasing surface area.
3Ease of operation
If wiring is exposed on surface, then ease of connection is improved, but electrical stability deteriorates due to damage and short-circuiting
Solution Approach 1:
The wiring is nested within the support member structure, with the plug embedded in the rear surface. This protects the wiring from external damage and short-circuiting while maintaining ease of connection through the exposed rear surface where the plug extends outward for connection.
Solution Approach 2:
The plug acts as an intermediary element that provides a protected pathway for electrical connection. It extends from the internal wiring through the rear surface, mediating between the internal wiring structure and external connection while providing protection against damage.
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 design provides a compact, high-integration pyroelectric detector with enhanced electrical stability and thermal isolation, maintaining detection sensitivity and enabling clear light distribution images in applications like thermographic devices and surveillance cameras.
Implementation Method 1
Pyroelectric type infrared detectors utilize an effect whereby the pyroelectric body undergoes a change in spontaneous polarization level due to the change in temperature in the pyroelectric body in accordance with the amount of infrared light that is received (pyroelectric effect or pyroelectron effect), and infrared light is detected as a result of the generation of pyroelectric current (change in surface charge due to the change in polarization level) in both terminals of the pyroelectric body.
Implementation Method 2
the metal oxide layer having a lower thermal conductivity than the metal layers. Therefore, the amount of heat emitted from the first electrode into the first plug and the first wiring layer can be reduced by the metal oxide layer with lower thermal conductivity than the metal layers, and thermal isolation of the pyroelectric detecting element can be ensured.
Data Source
AI summary
A pyroelectric detector includes a substrate, a support member, a spacer member, and a pyroelectric detecting element. The spacer member supports the support member over the substrate with a cavity part being formed therebetween. The pyroelectric detecting element includes a first electrode mounted on the support member, a second electrode, and a pyroelectric body between the first and second electrodes. The support member includes an insulating layer, a first wiring layer disposed on a side of the second surface of the support member with respect to the insulating layer, and a first plug passing through the insulating layer at a position where the pyroelectric body and the first wiring layer overlap in plan view to connect the first wiring layer with the first electrode.