Projector Reflector and Diffractive Optical Element for 3D Scanning
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Solution Overview
Problem
Current three-dimensional scanning methods are inefficient due to the need for multiple light pattern projections and complex reflector control, which increases scanning time and complexity.
Innovation Solution
A method and apparatus that control a projector by emitting point structured light, adjusting the tilt angle of a reflector to deflect the light into a diffractive or grating optical conversion device, converting it into line structured light for efficient projection onto a target object, thereby improving scanning efficiency by allowing scanning in a single direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light patterns are projected to illuminate the measured object, then the three-dimensional scanning completeness is improved, but the scanning time increases
Solution Approach 1:
The patent segments the light pattern into multiple independent line patterns that can be projected simultaneously. Each line pattern corresponds to a specific angular range, allowing the entire measurement range to be covered in a single projection cycle rather than requiring sequential projection of multiple patterns.
Solution Approach 2:
The patent introduces a spatial dimension by using a reflector to deflect light at different angles. Instead of projecting multiple patterns sequentially along the same path, the system uses angular deflection to create multiple projection paths simultaneously, transforming a temporal sequence into a spatial arrangement.
2Adaptability or versatility
If complex reflector control is used to adjust light patterns, then the scanning coverage is improved, but the system complexity increases
Solution Approach 1:
The patent replaces complex mechanical reflector control systems with a fixed reflector geometry combined with optical diffraction. Instead of actively controlling the reflector to steer multiple light patterns, the system uses the fixed reflector shape and diffraction grating to automatically generate and direct multiple line patterns across the measurement range.
3Productivity
If point structured light is converted into line structured light, then the scanning efficiency is improved, but the optical system complexity increases
Solution Approach 1:
The patent introduces an optical conversion device as an intermediary between the point light source and the measurement target. This device, which may include diffractive optical elements or grating structures, transforms the point light into multiple line patterns while maintaining a relatively simple overall optical system architecture.
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 approach significantly enhances the efficiency of three-dimensional scanning by reducing scanning time and simplifying the reflector control, allowing for high-speed scanning and accurate three-dimensional data acquisition.
Implementation Method 1
adjusting a tilt angle of the reflector to change the tilt angle of the reflector, to deflect, along a preset scanning direction, the point structured light reflected from the reflector
Implementation Method 2
The optical conversion device is configured for converting the point structured light incident onto the optical conversion device into line structured light
Data Source
AI summary
Methods and apparatuses for controlling a projector are provided. In some embodiments, a method includes: controlling the light source to emit point structured light to a reflector; and adjusting a tilt angle of the reflector to change the tilt angle of the reflector, and to enable the point structured light reflected from the reflector to an optical conversion device to deflect towards a preset scanning direction. The optical conversion device is used for converting the point structured light incident onto the optical conversion device into line structured light. The line structured light is used for forming a pattern that is projected onto a surface of a target object and extends along a direction intersecting with the preset scanning direction. Improved efficiency in three-dimensional scanning of a target object can be achieved.