Structured Light Projector Using Beam Multiplication Films
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Solution Overview
Problem
Structured light 3D sensing devices face challenges in producing light patterns with uniform intensity and safety due to inappropriate configurations between diffractive optical elements and laser light sources, leading to strong direct transmission intensities that can be hazardous.
Innovation Solution
The use of beam multiplication films made of anisotropic refractive index material to split light beams into multiple beams with similar intensities, combined with a wave plate to change polarization and reduce the need for complex diffractive optical elements, allowing for the effective production of structured light with improved safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a diffractive optical element is used with monochromatic light to divide the laser beam into multiple light beams, then structured light is formed, but the light intensities among those light beams are not similar and the direct transmission intensity may be too strong causing safety problems
Solution Approach 1:
A beam multiplication film is introduced as an intermediary component between the light source and the diffractive optical element. This film multiplies the laser beam into multiple beams with similar intensities before they reach the diffractive optical element, thereby reducing the direct transmission intensity and eliminating safety hazards while maintaining structured light formation capability
Solution Approach 2:
The laser beam is segmented into multiple beams of similar intensity through the beam multiplication film. This segmentation ensures that the light energy is distributed evenly across multiple beams rather than concentrated in a single strong beam, solving both the intensity uniformity and safety problems
2Productivity
If a diffractive optical element is used to generate light patterns, then structured light is produced, but the configuration complexity and heat dissipation issues increase
Solution Approach 1:
The optical system is segmented into two functional modules: a beam multiplication film for beam splitting and a diffractive optical element for pattern generation. This modular segmentation simplifies the overall configuration by clearly defining the function of each component and reducing the complexity of system integration and heat dissipation management
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 enables the production of structured light with uniform intensity and improved safety, enhancing the precision and reliability of 3D surface contour measurement while reducing the complexity and heat dissipation issues associated with traditional methods.
Implementation Method 1
at least one beam multiplication film is disposed on a transmission path of the light beam and is made of anisotropic refractive index material, wherein a plurality of separated light beams are produced after the light beam from the light source passes through the at least one beam multiplication film
Implementation Method 2
The wave plate is disposed between adjacent two of the at least two beam multiplication films, wherein a polarization state of the light beam is changed from linear polarization to circular polarization or elliptical polarization after the light beam passes through the wave plate
Data Source
AI summary
An optical sensing device adopted to use structured light to detect an object is provided. The optical sensing device includes a structured light projector and a sensor. The structured light projector includes a light source and at least one beam multiplication film. The light source is configured to emit a light beam. The at least one beam multiplication film is disposed on a transmission path of the light beam and is made of anisotropic refractive index material, wherein a plurality of separated light beams are produced after the light beam from the light source passes through the at least one beam multiplication film, so as to form the structured light. The sensor is configured to sense the structured light reflected from the object. Besides, a structured light projector is also provided.