Laser Scanner Thin-Film Mirror for Electromagnetic Wave Dissipation
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Solution Overview
Problem
Laser scanners malfunction due to a decrease in built-in voltage at the PN junction caused by electromagnetic waves, particularly with the increasing energy density in 5G mobile communication services, leading to frequent malfunctions.
Innovation Solution
An oscillating mirror in the laser scanner is coated with a thin metal film to reflect received lasers and allow electromagnetic waves to penetrate, with the film thickness determined based on skin depth to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the mirror surface is coated with a thin metal film to reflect the received laser, then the laser reflection efficiency is improved, but the electromagnetic wave penetration is reduced
Solution Approach 1:
The patent applies parameter changes by carefully controlling the thickness of the metal film coating on the oscillating mirror. By adjusting this critical parameter, the system achieves optimal balance between laser reflection efficiency and electromagnetic wave penetration. The metal film thickness is specifically designed to be sufficient for laser reflection while remaining thin enough to allow electromagnetic waves to pass through, thereby resolving the technical contradiction between these two opposing requirements.
2Use of energy by moving object
If the metal film thickness is increased to improve laser reflection, then the laser energy utilization is improved, but the electromagnetic wave blocking increases causing malfunction
Solution Approach 1:
The patent resolves this contradiction by optimizing the metal film thickness parameter. The thickness is precisely controlled to fall within a specific range that ensures high laser energy utilization while preventing excessive electromagnetic wave blocking that would cause scanner malfunction. This parameter optimization allows the system to maintain both high energy efficiency and operational reliability simultaneously.
Solution Approach 2:
The patent employs composite material structure by combining the metal film coating with the oscillating mirror substrate. This composite structure leverages the high reflectivity of metal for laser energy utilization while the overall composite design (including substrate material selection and film thickness control) ensures adequate electromagnetic wave penetration to prevent malfunction, thus resolving the contradiction between energy utilization and reliability.
3Ease of manufacture
If the oscillating mirror uses a standard coating to simplify manufacturing, then the manufacturing complexity is reduced, but the electromagnetic wave interference protection is insufficient
Solution Approach 1:
The patent addresses this contradiction by specifying precise parameter ranges for the metal film thickness during manufacturing. Rather than requiring complex multi-layer coatings, the solution involves controlling the single-layer metal film thickness within an optimized range that provides both adequate laser reflection and sufficient electromagnetic wave penetration. This approach maintains manufacturing simplicity while effectively protecting against electromagnetic wave interference.
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
Prevents malfunctioning of the laser scanner by reflecting received lasers and allowing electromagnetic waves to dissipate, maintaining the scanner's functionality despite external electromagnetic interference.
Implementation Method 1
the received laser reflected from the object may be reflected by the mirror surface of the oscillating mirror coated with the thin metal film
Implementation Method 2
A thickness of the thin metal film coated on the mirror surface of the oscillating mirror may be determined based on a skin depth defined by using a conductivity and a permeability of a metal used for a coating and a frequency of a wave
Data Source
AI summary
Provided is a laser scanner. The laser scanner includes a laser transmitter configured to output a laser radiated towards an object, a laser receiver configured to receive a laser reflected from the object, and an oscillating mirror of which a mirror surface is coated with a thin metal film to reflect the received laser reflected from the object and be penetrated by an electromagnetic wave incident from an outside the laser scanner. The received laser reflected from the object is reflected by the mirror surface of the oscillating mirror coated with the thin metal film and received by a laser receiver, and the electromagnetic wave incident from the outside the laser scanner penetrates the mirror surface of the oscillating mirror and then dissipates.