3D Intersecting Lead Wire Electromagnetic Wave Sensor
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Solution Overview
Problem
In electromagnetic wave sensors, increasing the width of lead wires to reduce electrical resistance compromises detection accuracy due to increased heat radiation and shielding effects, affecting the ability to accurately detect infrared rays.
Innovation Solution
The design incorporates lead wires that intersect three-dimensionally, with at least one wire having a wide portion in overlapping areas, allowing for reduced electrical resistance without increasing the lead wire area, thereby minimizing heat radiation and shielding influences on the thermistor element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the lead wire is increased to reduce electrical resistance, then the electrical resistance decreases, but the area of the lead wire increases causing deterioration in detection accuracy
Solution Approach 1:
The lead wires are arranged to intersect in the thickness direction (third direction) rather than lying flat in the same plane. This three-dimensional arrangement allows the wires to cross without increasing their planar area, reducing both heat radiation and shielding effects on the thermistor element while maintaining low electrical resistance through adequate wire width
Solution Approach 2:
The lead wire structure is divided into multiple segments: a first wire extending in a first direction, a second wire extending in a second direction, and an overlapping portion where they intersect. At least one wire includes a wide portion in the overlapping area to reduce resistance without increasing overall planar area
2Reliability
If the area of the lead wire is increased to reduce electrical resistance, then the electrical resistance decreases, but the heat radiation from the lead wire to the thermistor element increases
Solution Approach 1:
By arranging lead wires to intersect in the thickness direction rather than expanding in the planar area, the design reduces the surface area of the lead wires that could radiate heat to the thermistor element while maintaining adequate wire dimensions for low electrical resistance
3Reliability
If the area of the lead wire is increased to reduce electrical resistance, then the electrical resistance decreases, but the shielding effect of the lead wire on the thermistor element increases
Solution Approach 1:
The three-dimensional arrangement with wires intersecting in the thickness direction minimizes the planar area occupied by lead wires, reducing their ability to shield the thermistor element from infrared rays while maintaining electrical connectivity with adequate wire width
Data Source
AI summary
An electromagnetic wave sensor includes: a first wire which extends in a first direction; a second wire which extends in a second direction different from the first direction; and an electromagnetic wave detector which is electrically connected to the first wire and is electrically connected to the second wire, wherein the second wire is provided so as to leave an interval with respect to the first wire in a third direction orthogonal to the first direction and the second direction, and the second wire is disposed to three-dimensionally intersect the first wire. At least one wire of the first wire and the second wire includes a wide portion, which is wider than an average value of a width of a portion excluding an overlapping portion of the at least one wire, in the overlapping portion in which the first wire and the second wire overlap each other.