Optical Damping Element for Smart Glasses Beam Guidance
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Solution Overview
Problem
Microelectro-optical beam-guidance devices face challenges in safely guiding and attenuating laser beams to prevent eye damage and backscattering, requiring effective optical damping elements that can reduce light intensity and deflect beams without causing interference or damage to sensitive components.
Innovation Solution
The design incorporates an optical damping element with a neutral filter and beam-guidance surfaces, where the entry and exit vectors of the laser beam are offset, allowing for selective intensity reduction and deflection, preventing backscattering and ensuring safe optical guidance, particularly in smart glasses applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an optical damping element with a neutral filter is used to reduce laser beam intensity, then eye safety is improved, but backscattering may still occur causing interference
Solution Approach 1:
The optical damping element is divided into functionally distinct components: a neutral filter for intensity reduction and beam-guidance surfaces for directional control. This segmentation allows each component to address specific harmful effects independently - the filter attenuates the beam to protect eyes while the surfaces redirect scattered light away from sensitive components.
Solution Approach 2:
The beam-guidance surfaces act as intermediaries between the incoming laser beam and the optical system components. By deflecting the beam at controlled angles, these surfaces prevent backscattered light from returning to the source or interfering with other components, while the neutral filter mediates the intensity reduction to ensure eye safety.
2Object-generated harmful factors
If the entry and exit vectors are offset to prevent backscattering, then interference is reduced, but alignment precision becomes more difficult
Solution Approach 1:
The optical damping element employs asymmetric beam-guidance surfaces with different orientations relative to the entry and exit vectors. This asymmetric geometry is specifically designed to deflect backscattered light away from the source while maintaining manufacturable tolerances, resolving the conflict between preventing interference and ease of alignment.
3Object-affected harmful factors
If a neutral filter is used for wavelength-independent attenuation, then broad spectrum protection is improved, but selective wavelength filtering is lost
Solution Approach 1:
The neutral filter provides universal protection across broad wavelength ranges by attenuating all wavelengths equally, ensuring comprehensive eye safety. The beam-guidance surfaces add multi-functionality by simultaneously managing beam direction and preventing backscattering, making the system adaptable to different laser wavelengths without requiring wavelength-specific filters.
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
This solution effectively reduces the risk of eye damage by attenuating laser beams and preventing backscattering, ensuring safe and efficient optical guidance while maintaining flexibility in alignment and tolerance, thus enhancing the safety and performance of smart glasses.
Implementation Method 1
the optical filter being provided to reduce—an intensity of a light beam, particularly a laser beam, when passing through the optical damping element
Implementation Method 2
portions of a light beam reflected at the optical filter within the optical damping element have a reflection vector upon exiting the optical damping element
Data Source
AI summary
A microelectro-optical beam-guidance device. The device includes an optical damping element that includes an optical filter and beam-guidance surfaces. The optical filter is provided to reduce an intensity of a light beam when passing through the optical damping element. The beam-guidance surfaces are being disposed and/or formed in such a way that an intended entry vector of a light beam into the optical damping element and an intended exit vector of the light beam out of the optical damping element are offset relative to each other as viewed along the intended entry vector. The beam-guidance surfaces and the optical filter are disposed and/or formed in such a way that portions of a light beam reflected at the optical filter within the optical damping element have a reflection vector upon exiting the optical damping element which is different from a vector antiparallel to the intended entry vector.