Microlens Optical System for High-Contrast Long-Range Measurement
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Solution Overview
Problem
Conventional optical system devices using microlens arrays for three-dimensional measurement suffer from variability in light intensity due to diffraction, which is unsuitable for long-distance measurements, and replacing diffraction gratings with microlenses results in decreased contrast and difficulty in adjusting the light source-microlens distance.
Innovation Solution
An optical system device with periodically arranged lenses and a specific distance and focal position relationship between the light source and optical element, utilizing a VCSEL with controlled bonding layers to enhance light intensity and contrast, and optionally incorporating a mask to absorb or diffuse reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a microlens array with random placement is used to suppress light intensity variability, then uniformity of emitted light is improved, but light intensity decreases making it unsuitable for long-distance measurement
Solution Approach 1:
The patent changes the arrangement parameter from random to periodic, and adjusts the distance parameter L1 to satisfy a specific formula relationship with the focal position. This parameter optimization resolves the contradiction by achieving both high uniformity through periodic arrangement and sufficient intensity through proper focal distance control.
2Illumination intensity
If a diffraction grating is replaced with a microlens array to emit dot pattern light, then light intensity is improved, but contrast of the dot pattern decreases
Solution Approach 1:
The patent optimizes the distance parameter L1 between the emitting unit and focal position to satisfy a specific formula relationship. This parameter adjustment enables the microlens array to achieve both high light intensity and high contrast dot patterns, resolving the contradiction between intensity and contrast.
3Illumination intensity
If a diffraction grating is replaced with a microlens array, then light intensity is improved, but difficulty in adjusting distance between light source and microlens increases
Solution Approach 1:
The patent establishes a specific formula relationship for distance L1 between the emitting unit and focal position. This formula-based approach simplifies the adjustment process by providing a clear design guideline, resolving the contradiction between achieving high intensity and maintaining ease of distance adjustment.
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 device achieves high light contrast and intensity suitable for long-distance measurements, with a manufacturing method that ensures precise alignment and bonding for optimal performance.
Implementation Method 1
a light source which emits light with a wavelength λ
Implementation Method 2
the variability occurs in light intensity due to the adverse effect of diffraction since the microlens array employs a periodic structure
Implementation Method 3
an optical element that includes a plurality of lenses 21 having a focal distance f
Implementation Method 4
either one of or both of an upper-end-side bonding layer 51 that bonds the optical element 2 and an upper end of the side member 4 with each other or a lower-end-side bonding layer 52 that bonds the bottom member 3 and a lower end of the side member 4
Data Source
AI summary
The present disclosure provides an optical system device capable of emitting light with a high contrast, and a method for manufacturing the same are provided.