Pseudo Sheet Structure Balancing Sensor Heating and Wave Transmission
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Solution Overview
Problem
Existing technologies face challenges in providing a heater that efficiently transmits electromagnetic waves while maintaining heating performance, particularly in environments where polarized waves are reflected or absorbed, such as on car emblems, leading to inaccurate position information acquisition.
Innovation Solution
A pseudo sheet structure with conductive linear bodies arranged at specific intervals and orientations to transmit electromagnetic waves efficiently, functioning as both a heater and electromagnetic wave filter, with a formula defining the interval and width of these bodies to optimize transmission and heating performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater using ITO (Indium Tin Oxide) is provided, then heating function is achieved, but electromagnetic wave transmittance deteriorates significantly
Solution Approach 1:
The patent divides the continuous conductive layer into discrete conductive linear bodies arranged in a grid pattern. This segmentation allows electromagnetic waves to pass through the gaps between the linear bodies while still providing sufficient heating function through the distributed conductive elements.
Solution Approach 2:
The patent applies different properties to different parts of the structure: the conductive linear bodies provide heating functionality locally, while the spaces between them maintain electromagnetic wave transmittance. The interval and width parameters are optimized to balance these local qualities.
2Loss of energy
If a metal foil with cracks is used for emblem, then electromagnetic wave damping is reduced, but structural integrity and appearance quality deteriorate
Solution Approach 1:
Instead of using a cracked metal foil, the patent employs a grid of discrete conductive linear bodies. This segmentation achieves the electromagnetic wave transmission effect without the visual degradation and structural weaknesses associated with cracks in a continuous foil.
Solution Approach 2:
The patent creates a composite structure combining conductive linear bodies with transparent or semi-transparent spacing material. This composite approach maintains the aesthetic appearance while achieving the desired electromagnetic wave transmission characteristics.
3Temperature
If conductive linear bodies are arranged with small interval, then heating performance is improved, but electromagnetic wave transmittance deteriorates
Solution Approach 1:
The patent optimizes the interval parameter L and width parameter W of the conductive linear bodies to achieve the desired balance. By carefully selecting these parameters within specific ranges, the system achieves both adequate heating performance and acceptable electromagnetic wave transmittance.
Solution Approach 2:
The patent uses a sparse arrangement of conductive linear bodies that provides sufficient heating function without completely blocking electromagnetic waves. The partial coverage approach allows both functions to coexist by providing just enough conductive material for heating while leaving sufficient gaps for wave transmission.
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 pseudo sheet structure effectively transmits electromagnetic waves and functions as a heater, reducing reflection and absorption, ensuring accurate position information acquisition and preventing sensor malfunctions from external electromagnetic interference.
Implementation Method 1
a plurality of conductive linear bodies arranged at an interval, and the interval L between the plurality of conductive linear bodies satisfies a formula (1) below
Implementation Method 2
the interval L between the plurality of conductive linear bodies satisfies a formula (1) below: 0.034×λS≤L≤20 mm
Data Source
AI summary
A pseudo sheet structure is usable for a sensor configured to emit an electromagnetic wave in a band ranging from 20 GHz to 100 GHz. The pseudo sheet structure includes a plurality of conductive linear bodies arranged at an interval L satisfying a formula (1) below, 0.034×λS≤L≤20 mm (1). In the formula (1), L is the interval between the plurality of conductive linear bodies, λS is a wavelength of the electromagnetic wave emitted by the sensor, and a unit for each of L and λS is mm.