Onboard Sensor Cover Homogeneous Bases for Infrared and Millimeter Wave Transmittance
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Solution Overview
Problem
Existing onboard sensor covers fail to allow the passage of both infrared rays and millimeter waves without obstructing object recognition and cannot create a three-dimensional decorative appearance from all viewing angles.
Innovation Solution
The onboard sensor cover features a transparent plastic front base with a first uneven surface and a matching rear base with a second uneven surface, both made of the same type of plastic material, and a decorative layer that reflects visible light and allows passage of infrared and millimeter waves, ensuring minimal refractive index difference between the bases to maintain accurate object recognition and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a decorative layer is added to the base to improve aesthetic appeal and create three-dimensional appearance, then the decorative appearance is improved, but infrared rays are refracted causing inaccurate object recognition
Solution Approach 1:
The patent applies homogeneity by making the front base and rear base consist of the same transparent plastic material with identical refractive indices. This eliminates refraction at the interface between bases, ensuring infrared rays pass through without deviation while still allowing the decorative layer to create three-dimensional visual effects from visible light refraction.
2Shape
If a single base with uneven surface is used to create three-dimensional appearance, then aesthetic appeal is improved, but refraction of infrared rays occurs causing inaccurate object recognition
Solution Approach 1:
The patent segments the single base into two separate bases: a front base with an uneven surface for aesthetic purposes and a rear base with a flat surface for functional purposes. The uneven surface of the front base creates three-dimensional visual effects, while the flat surface of the rear base ensures infrared rays pass through without refraction, maintaining reliable object detection.
Solution Approach 2:
The patent applies local quality by giving different surface characteristics to different parts of the base structure. The front base has an uneven surface specifically for aesthetic regions, while the rear base maintains a flat surface in the infrared transmission path. This localized differentiation allows simultaneous achievement of aesthetic appeal and detection reliability.
3Use of energy by moving object
If transparent plastic material is used for the base to allow infrared passage, then infrared transmittance is improved, but millimeter wave attenuation occurs
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the thickness parameter of the transparent plastic bases. The bases are designed with a thickness that allows high infrared transmittance while minimizing millimeter wave attenuation. This parameter optimization enables the single transparent plastic material to serve both infrared sensor and millimeter wave radar functions effectively.
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 solution enables effective passage of both infrared and millimeter waves, maintaining object recognition and enhancing the aesthetic appeal by creating a three-dimensional decorative appearance regardless of the viewing angle, while reducing millimeter wave attenuation and ensuring high transmittance of infrared rays.
Implementation Method 1
The refractive index of the base 81 greatly differs from the refractive index of the atmosphere. Thus, when an infrared ray IR passes through the interface between the inclined wall surface 87 of the recess 86 and the atmosphere, the infrared ray IR greatly refracts to change its travel direction.
Implementation Method 2
The decorative layer 91 is made of a material that reflects visible light and permits passage of infrared rays.
Data Source
AI summary
An onboard sensor cover includes a cover body that includes front and rear bases and a decorative layer. The front base is made of a transparent plastic material that permits passage of an infrared ray and a millimeter wave and includes a rear surface in the transmission directions of the infrared ray and the millimeter wave that is configured by a first uneven surface. The rear base is made of a plastic material that permits passage of the infrared ray and the millimeter wave and includes a front surface in the transmission directions that is configured by a second uneven surface. The decorative layer is made of a material that reflects visible light and permits passage of the infrared ray and the millimeter wave and is in contact with the first and second uneven surfaces. The front and rear bases are made of the same type of plastic material.