Reflective Grating Laser Projection Module
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Solution Overview
Problem
Existing projection modules using edge-emitting lasers require additional prisms to adjust laser direction, occupying space and increasing costs.
Innovation Solution
Incorporating a reflective grating with a grating microstructure on its surface, obliquely arranged relative to the laser emitter, which expands and adjusts the laser light without the need for a separate prism, allowing for a more compact and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an extra prism is arranged to adjust the laser direction, then the laser reflection angle can be adjusted, but the mounting space is occupied and the cost increases
Solution Approach 1:
The patent combines the laser expansion function and the reflection angle adjustment function into a single reflective grating component. The grating microstructure on the reflective grating surface simultaneously expands the laser light and adjusts its reflection angle, eliminating the need for separate prisms and reducing device complexity while maintaining operational capability
Solution Approach 2:
The reflective grating is designed to perform multiple functions: it expands the laser light into a laser pattern and simultaneously adjusts the reflection angle. This multi-functional component replaces what would traditionally require multiple separate optical elements, reducing both space requirements and cost
2Length of stationary object
If the light emitting surface is arranged perpendicular to the substrate, then the projection module height is reduced, but the laser emitter must be in a lying-flat arrangement
Solution Approach 1:
The patent changes the arrangement dimension of the laser emitter from a vertical orientation to a horizontal (lying-flat) orientation. By making the light emitting surface perpendicular to the substrate and arranging the laser emitter horizontally, the optical path is folded within the plane, effectively reducing the height dimension of the projection module while maintaining the necessary optical functions
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 configuration enables the projection module to generate a laser pattern while adjusting the reflection angle, reducing space and cost requirements, and providing high precision and accuracy in depth imaging.
Implementation Method 1
The reflecting surface is provided with a grating microstructure thereon, the grating microstructure is configured to expand the laser light to form a laser pattern
Implementation Method 2
The reflecting surface is arranged obliquely relative to the light emitting surface and is opposite the light emitting surface. The reflecting surface is configured to adjust an exit angle of the laser pattern
Data Source
AI summary
Disclosed are a projection module, a structured light three-dimensional imaging device, and an electronic apparatus. The projection module includes a laser emitter and a reflective grating. The laser emitter includes a light emitting surface from which laser light is emitted. The reflective grating includes a reflecting surface arranged obliquely relative to the light emitting surface and opposite to the light emitting surface. The reflective face is provided with a grating microstructure thereon. The projection module can adjust a reflection angle of the laser light when expanding beams to generate a laser pattern.