Light-Receiving Device With Glass-Cover Diffraction Gratings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LiDAR systems face challenges in accurately receiving laser light for distance measurement while maintaining a thin device thickness.
Innovation Solution
A light-receiving device with a glass cover featuring diffraction gratings that concentrate laser light on specific light-receiving portions, eliminating the need for separate light-concentrating elements and allowing for a thinner design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate light-concentrating element is provided between the light-receiving element and the glass cover, then light concentration accuracy is improved, but device thickness is increased
Solution Approach 1:
The patent merges the light-concentrating element with the glass cover by forming the diffraction grating directly on the light-receiving surface of the glass cover. This integration eliminates the need for a separate light-concentrating element positioned between the light-receiving element and glass cover, thereby reducing device thickness while maintaining light concentration accuracy through the diffraction grating's optical focusing capability
Solution Approach 2:
The glass cover is given multiple functions: it serves as both the protective cover and the light-concentrating element through the integrated diffraction grating. This multi-functionality eliminates the need for separate components and reduces overall device thickness while maintaining accurate light reception
2Length of moving object
If the glass cover is placed closer to the light-receiving element, then device thickness is reduced, but light concentration accuracy may deteriorate
Solution Approach 1:
The patent replaces the mechanical positioning approach with an optical solution by integrating the diffraction grating directly on the glass cover. This allows the glass cover to be placed closer to the light-receiving element for thinness while the diffraction grating's optical properties ensure accurate light concentration without requiring larger spacing
3Device complexity
If diffraction gratings are provided only on the second surface of the glass cover, then device complexity is reduced, but light concentration effectiveness is insufficient
Solution Approach 1:
The patent extends the diffraction grating configuration from a single surface (second surface) to multiple locations (first surface and/or inside of the glass cover). This multi-dimensional approach enhances light concentration effectiveness by creating additional optical paths and focusing points without significantly increasing structural complexity
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 improved sensitivity and reduced crosstalk between light-receiving portions while maintaining a thin profile, enabling accurate laser light reception for distance measurement.
Implementation Method 1
The glass cover includes a plurality of diffraction gratings provided in at least one of the first surface and an inside of the glass cover. Each of the plurality of diffraction gratings is configured to concentrate laser light for distance measurement on each of the plurality of light-receiving portions
Data Source
AI summary
A light-receiving device includes a light-receiving element in which a plurality of light-receiving portions are provided; and a glass cover that has a first surface and a second surface opposite to the first surface and that is fixed above the light-receiving element such that the second surface faces the light-receiving element. The glass cover includes a plurality of diffraction gratings provided in at least one of the first surface and an inside of the glass cover. Each of the plurality of diffraction gratings is configured to concentrate laser light for distance measurement on each of the plurality of light-receiving portions, the laser light for distance measurement incident on the first surface of the glass cover.