Aircraft Light Sensor Cap With Dual-Metal EMI Shielding
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Solution Overview
Problem
Existing aircraft lights face challenges with electromagnetic interference (EMI) shielding, as known shielding devices are costly, heavy, and/or difficult to produce, and light barriers are not fully effective in blocking undesired light from reaching light sensors.
Innovation Solution
An aircraft light with a sensor cap featuring a layered structure comprising a cap-shaped support layer and two metal coating layers, where the first layer is made of a transition metal like copper and the second layer is made of a noble metal like gold, providing effective EMI shielding and light blocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If known shielding devices are used to protect electronic components from electromagnetic interference, then electromagnetic shielding is improved, but cost and weight increase
Solution Approach 1:
The sensor cap employs a composite structure consisting of a plastic support layer and a metal coating layer. The plastic layer provides mechanical support and forms the cavity, while the thin metal coating (approximately 10-20 μm thick) provides the necessary electromagnetic shielding. This composite approach achieves effective EMI protection with significantly reduced weight and cost compared to traditional solid metal shielding devices.
2Object-affected harmful factors
If known shielding devices are used to protect electronic components from electromagnetic interference, then electromagnetic shielding is improved, but manufacturing difficulty and cost increase
Solution Approach 1:
The sensor cap uses a plastic support layer that can be easily molded using standard injection molding techniques, with cavities formed directly during the molding process. The metal coating is applied as a thin layer (approximately 10-20 μm) over the plastic structure. This combination of easy-to-manufacture plastic molding and straightforward metal coating processes makes the sensor cap significantly easier and more cost-effective to produce compared to traditional metal shielding devices.
3Object-affected harmful factors
If light barriers are used to block undesired light from reaching the light sensor, then light blocking capability is improved, but effectiveness and ease of production deteriorate
Solution Approach 1:
The sensor cap integrates both mechanical shielding and optical blocking functions into a single composite structure. The plastic support layer provides the physical barrier and cavity formation, while the metal coating layer simultaneously provides electromagnetic shielding and enhances light blocking capabilities. This unified design eliminates the need for separate light barrier components, improving overall effectiveness while simplifying manufacturing.
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 sensor cap effectively shields against electromagnetic interference while allowing a dedicated portion of light to reach the light sensor, reducing weight and cost, and enhancing the reliability of light detection.
Implementation Method 1
The combination of the two coating layers made of metal, which are applied to the cap-shaped support layer of the sensor cap, provides an effective electromagnetic interference shield (EMI shield) for ensuring a low level of electromagnetic interference or even preventing electromagnetic interference at the light sensor.
Implementation Method 2
light barriers, such as light sensor caps, are often not fully satisfactory in blocking undesired light from reaching a light sensor of the aircraft light
Data Source
AI summary
An aircraft light comprises: at least one light source for providing an aircraft light output; a light sensor for detecting a performance level of the aircraft light output; and a sensor cap, arranged over the light sensor and defining a cavity for accommodating the light sensor. The sensor cap has a layered structure comprising: a cap-shaped support layer; a first coating layer, wherein the first coating layer is made of a first metal and is arranged on an inner side of the cap-shaped support layer; and a second coating layer. The second coating layer is made of a second metal and is arranged on the first coating layer.